BR112019003170B1 - METHOD PERFORMED BY A USER EQUIPMENT (UE) IN A WIRELESS COMMUNICATION SYSTEM, METHOD PERFORMED BY A BASE STATION (BS) IN A WIRELESS COMMUNICATION SYSTEM, COMPUTER READABLE MEDIA, USER EQUIPMENT (UE) CONFIGURED TO OPERATE ON A WIRELESS COMMUNICATION SYSTEM AND BASE STATION (BS) CONFIGURED TO OPERATE IN A WIRELESS COMMUNICATION SYSTEM - Google Patents

Abstract

The present invention relates to a method for receiving, by a terminal, downlink control information in a wireless communications system in accordance with an embodiment of the present invention comprising the steps of: receiving information about a reference subcarrier spacing (SCS) among a plurality of SCS numerologies; receiving downlink control information via a terminal group common physical downlink control channel (PDCCH); and obtaining information about a partition format from the downlink control information, wherein the downlink control information indicates the partition format based on the reference SCS, and when the terminal SCS is different from the reference SCS, the terminal can convert the partition format of the reference SCS according to the SCS of the terminal.

Description

[Technical field]

[001] The present invention relates to a wireless communication system and, more particularly, to a method and apparatus for transmitting or receiving downlink (DL) control information in a wireless communication system.

[Foundation Technique]

[002] First, the existing LTE/LTE-A 3GPP system will be briefly described. Referring to FIG. 1, the UE performs an initial cell search (S101). In the initial cell search process, the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from a base station, performs downlink synchronization with the BS, and acquires information as a Cell ID. Then, the UE acquires system information (e.g. MIB) via a PBCH (Physical Broadcast Channel). The UE can receive the DL RS (Downlink Reference Signal) and check the downlink channel status.

[003] After the initial cell search, the UE can acquire more detailed system information (e.g., SIBs) by receiving a physical downlink control channel (PDCCH) and a programmed physical downlink control channel (PDSCH). by PDCCH (S102).

[004] The UE may perform a random access procedure for uplink synchronization. The UE transmits a preamble (e.g., Msg1) over a physical random access channel (PRACH) (S103), and receives a response message (e.g., Msg2) for the preamble through the PDCCH and PDSCH corresponding to the PDCCH. In the case of a contention-based random access, a contention resolution procedure such as additional PRACH transmission (S105) and PDCCH/PDSCH reception (S106) can be performed.

[005] Then, the UE can perform PDCCH/PDSCH reception (S107) and Physical uplink Shared Channel (PUSCH)/Physical uplink Control Channel (PUCCH) transmission (S108) as a transmission procedure. general uplink/downlink signal. The UE can transmit UCI (Uplink Control Information) to the BS. UCI may include HARQ ACK/NACK (Hybrid Automatic Retry Acknowledgment/Negative ACK), SR (Scheduling Request), CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator) and/or RI, etc.

[Disclosure] [Technical problem]

[006] An object of the present invention intended to solve the problem remains a method and apparatus for more effectively and accurately indicating a partition format through downlink (DL) control information in a wireless communication system for support multiple subcarrier spacing (SCS).

[007] It should be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide a further explanation of the invention as claimed.

[Technical Solution]

[008] The object of the present invention can be achieved by providing a method for receiving downlink (DL) control information by a user equipment (UE) in a wireless communication system, the method including receiving information about subcarrier spacing reference point (SCS) between a plurality of SCS numerologies, receive DL control information through a common downlink control channel (PDCCH) and acquire information about a partition format, from the DL control information, in that the DL control information indicates the partition format based on the reference SCS, and that, when the SCS of the UE is different from the reference SCS, the UE converts a partition format of the reference SCS in accordance with the UE SCS.

[009] In another aspect of the present invention, there is provided a user equipment (UE) for receiving downlink (DL) control information, including a receiver, and a processor configured to control the receiver to receive subcarrier spacing information. (SCS) between a plurality of SCS numerologies, receive DL control information through a common physical downlink control channel (PDCCH), and acquire information about a partition format from the DL control information , wherein the DL control information indicates the partition format based on the reference SCS, and wherein, when the UE's SCS is different from the reference SCS, the processor converts a partition format of the reference SCS in accordance with the SCS of the UE.

[010] In another aspect of the present invention, provided herein, is a method for transmitting downlink (DL) control information by a base station (BS) in a wireless communication system, including transmitting information in reference subcarrier spacing (SCS) between a plurality of SCS numerologies, generate DL control information including information about a partition format, and transmit the DL control information to a group UE including the UE through a channel UE group physical downlink control (PDCCH), where even if the SCS of the UE is different from the reference SCS, the BS notifies the UE about the partition format based on the reference SCS.

[011] In another aspect of the present invention, there is provided herein a base station (BS) for carrying out the above-mentioned method for transmitting DL control information.

[012] Information about the reference SCS can be received via higher layer signaling.

[013] The time duration of 1 partition may be variable depending on the SCS, and the reference SCS may be configured to be equal to or less than the SCS of the UE such that the time duration of 1 partition based on the SCS reference value is equal to or greater than the time duration of 1 partition based on the SCS of the UE.

[014] When the SCS of the UE is M times the reference SCS, the UE may interpret 1 partition based on the reference SCS as M contiguous partitions based on the SCS of the UE.

[015] The UE can determine, based on information about the partition format, whether each of a plurality of symbols included in a corresponding partition corresponds to downlink (D), uplink (U) or flexible (X); and, wherein, when the SCS of the UE is M times the reference SCS, the UE may interpret a D, U or X symbol based on the reference SCS as M number of D, U or X symbols based on the SCS of the HUH.

[016] The partition format information may indicate at least one of the partition format combinations configured in the UE.

[017] The UE may be configured with a plurality of frequency bands and each partition format combination may be a combination of a plurality of partition formats of the plurality of frequency bands.

[018] The combination of each partition format is a combination of a partition format for a DL frequency band and a partition format for a UL frequency band. Alternatively, wherein the combination of each partition format may be a combination of a partition format for a new radio access technology (NR) frequency band and a partition format for a long-term evolution frequency band (LTE).

[019] The partition format combinations configured in the UE may be received via higher layer signaling and may be a subset of a plurality of partition format combinations supported in the wireless communications system.

[Advantageous Effects]

[020] In accordance with an embodiment of the present invention, reference subcarrier spacing (SCS) is configured in a wireless communication system in which multiple SCS are supported to accurately interpret a partition format and a partition format can be signaled UE group normally based on the reference SCS and therefore a physical downlink control channel (PDCCH) payload size can be reduced and PDCCH overhead can be reduced compared to the case where a Partition format is indicated for each separate SCS.

[021] It will be appreciated by those skilled in the art that the effects that can be achieved with the present invention are not limited to what has been particularly described herein above and other advantages of the present invention will be more clearly understood from the detailed description that follows together with attached drawings

[Description of Drawings]

[022] FIG. 1 illustrates the physical channels used in a 3GPP LTE/LTE-A system and a general method for signal transmission using the physical channels.

[023] FIG. 2 illustrates 1 partition based on 15 kHz subcarrier spacing (SCS) and 1 partition based on 60 kHz SCS.

[024] FIG. 3 illustrates combinations of partition formats in accordance with an embodiment of the present invention.

[025] FIG. 4 illustrates combinations of partition formats in accordance with another embodiment of the present invention.

[026] FIGS. 5 and 6 illustrate combinations of partition formats according to another embodiment of the present invention.

[027] FIG. 7 illustrates a partition format combination in accordance with an embodiment of the present invention.

[028] FIG. 8 illustrates partition format patterns in accordance with an embodiment of the present invention.

[029] FIG. 9 illustrates the reserved allocation of resources for a common physical downlink control channel (PDCCH) in accordance with an embodiment of the present invention.

[030] FIG. 10 illustrates a GSS implemented in a CSS in accordance with an embodiment of the present invention.

[031] FIG. 11 illustrates GSS candidates having a fixed position in a CSS in accordance with an embodiment of the present invention.

[032] FIGS. 12 and 13 illustrate partition patterns of multiple CCs in accordance with an embodiment of the present invention.

[033] FIG. 14 illustrates multiple CC partition patterns in accordance with another embodiment of the present invention.

[034] FIG. 15 illustrates a flow of a method for transmitting and receiving downlink control information (DCI) in accordance with an embodiment of the present invention.

[035] FIG. 16 illustrates a base station (BS) and a user equipment (UE) in accordance with an embodiment of the present invention

[Invention Mode]

[036] The following description of embodiments of the present invention can apply to various wireless access systems including CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (frequency division multiple access) time), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access) and the like. CDMA can be implemented with such a radio technology as UTRA (universal terrestrial radio access), CDMA 2000 and the like. TDMA can be implemented with a radio technology such as GSM / GPRS / EDGE (Global System for Mobile Communications) / General Packet Radio Service / Enhanced Data Rates for GSM Evolution. OFDMA can be implemented with a radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UTRA (Evolved UTRA), etc. UTRA is part of UMTS (Universal System for Mobile Telecommunications). LTE (long term evolution) 3GPP (3rd Generation Partnership Project) is part of E-UMTS (Evolved UMTS) which uses E-UTRA. LTE 3GPP adopts OFDMA on the downlink and adopts SC-FDMA on the uplink. LTE-A (LTE-Advanced) is an evolved version of LTE 3GPP.

[037] For greater clarity, the following description mainly refers to the LTE 3GPP system or the LTE-A 3GPP system, by which the technical idea of the present invention can be not limited. The specific terminologies used in the following description are provided to help understand the present invention and the use of the terminologies may be modified to a different form within the scope of the technical idea of the present invention.

[038] As much as possible, communication devices have required high communication capacity and therefore there has been a need for enhanced mobile broadband (eMBB) communication compared to radio access technology (RAT) in a communication system recently discussed state-of-the-art. Furthermore, massive machine-type communications (mMTC) to connect a plurality of devices and objects to provide various services at any time and any place is also one of the factors to be considered in next-generation communication. Furthermore, in consideration of reliability and latency-sensitive service/user equipment (UE), ultra-reliable and low-latency communication (URLLC) has been discussed for a next-generation communication system.

[039] Thus, new RAT that considers eMBB, mMTC, URLCC and so on has been discussed for next generation wireless communication.

[040] Some LTE / LTE-A operations and configurations that are not at odds with the New RAT design may also be applied to the New RAT. For convenience, the new RAT can be called 5G mobile communication.

<NR Frame Structure and Physical Resource>

[041] In an NR system, downlink (DL) and uplink (UL) transmission can be carried out through frames lasting 10 ms and each frame can include 10 subframes. Accordingly, 1 subframe can correspond to 1 ms. Each frame can be divided into two half frames.

[042] 1 subframe may include Nsymbsubframe^ = Nsymbpartition Nsympartition represents the number of symbols per partition, μ represents OFDM numerology, and Npart^osubframe'μ represents the number of partitions per subframe in relation to the corresponding μ. In NR, several OFDM numerologies shown in Table 1 below can be supported. [Table 1]

[043] In the table above, Δf refers to the subcarrier spacing (SCS). μ and cyclic prefix with respect to a DL carrier bandwidth portion (BWP) and μ and cyclic prefix with respect to a UL carrier BWP can be configured for a UE via UL signaling.

[044] Table 2 below shows the number of Nsymbpartition of symbols per partition, the number Npartitionframe^ of symbols per frame and the number Npart^osubframe'μ of partitions per subframe in relation to each SCS in the case of normal CP. [Table 2]

[045] Table 3 below shows the Nsympartition number of symbols per partition, the Nsympartition number of partitions per frame and the Nsympartition number of partitions per subframe in relation to each SCS in the case of the extended PC. [Table 3]

[046] As such, in an NR system, the number of partitions included in 1 subframe may be variable depending on the subcarrier spacing (SCS). The OFDM symbols included in each partition can correspond to any of D (DL), U (UL), and X (flexible). DL transmission can be performed on a D or X symbol and UL transmission can be performed on a U or X symbol. A flexible resource (e.g. symbol Unknown resource.

[047] In NR, a resource block (RB) can correspond to 12 subcarriers in the frequency domain. An RB may include a plurality of OFDM symbols. A resource element (RE) can correspond to 1 subcarrier and 1 OFDM symbol. Thus, 12 REs can be present in 1 OFDM symbol in 1 RB.

[048] A carrier BWP can be defined as a set of contiguous physical resource blocks (PRBs). The carrier BWP may also be simply referred to as a BWP. A maximum of 4 BWPs can be configured for each UL/DL link in 1 UE. Even if multiple BWPs are configured, 1 BWP can be activated for a certain period of time. However, when a supplementary uplink (SUL) is configured on a UE, 4 BWPs can be additionally configured for the SUL and 1 BWP can be activated during a certain period of time. A UE cannot be expected to receive a PDSCH, a PDCCH, a channel state information reference signal (CSI-RS), or a tracking reference signal (TRS) outside of the activated BWP DL. Furthermore, the UE cannot be expected to receive a PUSCH or a PUCCH from the activated BWP UL.

<NR DL Control Channel>

[049] In an NR system, a transmission NR system, a control channel transmission unit can be defined as a resource element group (REG) and/or a control channel element (CCE), etc. .

[050] A REG can correspond to 1 OFDM symbol in the time domain and can correspond to 1 PRB in the frequency domain. Furthermore, 1 CCE can correspond to 6 REGs.

[051] A set of control resources (CORESET) and a search space (SS) are now briefly described. CORESET can be a set of resources for control signal transmission, and the search space can be aggregation of control channel candidates to realize blind detection. The search space can be configured for CORESET. For example, when a search space is defined in a CORESET, a CORESET for a common search space (CSS) and a CORESET for a UE-specific search space (USS) can be configured. As another example, a plurality of search spaces can be defined in a CORESET. For example, CSS and USS can be set to the same CORESET. In the following example, the CSS may refer to a CORESET with a CSS configured for that purpose, and the USS may refer to a CORESET with a USS configured for that purpose, or something similar.

[052] A base station may signal information about a CORESET to a UE. For example, a CORESET setting for each CORESET and time duration (e.g. symbol 1/2/3) of the corresponding CORESET can be signaled. When interleaving to distribute a CCE to 1 CORESET symbol is applied, 2 or 6 REGs can be grouped. Grouping of 2 or 6 REGs can be performed in 2 CORESET symbols and time-first mapping can be applied. Grouping of 3 or 6 REGs can be performed in 3 CORESET symbols and time-first mapping can be applied. When REG grouping is performed, the UE may assume the same precoding with respect to a grouping aggregation unit.

<Partition Format Indication>

[053] A partition type and an operational method of a UE when a guard period (GP) is maintained or changed are now described. Additionally, a method for handling partition type indication when the numerology of a partition type is changed and methods for indicating reserved resources are described below. A partition type can be referred to as a partition format.

1. Partition Type Indication

[054] A UE may receive information about a partition type. Partition type information may indicate a type of partition and may include information about, for example, a downlink pilot time (DwPTS) partition, an uplink pilot time (UpPTS) partition, a guard period (GP) and a reserved resource.

[055] Information about the type of partition can be transmitted periodically or aperiodically. Whether the received partition type indication information is applied may be determined by the UE or may be forcibly applied.

[056] For example, information about the type of partition can be received through a PDCCH. For example, partition type information may be received via a common PDCCH or may also be received via UE-specific control information (e.g., DCI).

[057] The partition type information received through the common PDCCH may be control information to collectively indicate a partition type for a specific group of UEs or all UEs in a cell. The partition type information received through the UE-specific PDCCH may be control information, indicating a partition type of each UE.

2. Guard Period (GP) (1) Partition-based GP, all configured in DL or UL

[058] A GP can be defined according to a final position of a DwPTS and an initial position of an UpPTS.

[059] The GP can be positioned after the DwPTS. The final position of the DwPTS can be transmitted to a UE via a common PDCCH. For example, the UE can calculate the GP based on the final position transmitted from the DwPTS, and the UpPTS and UL partition in which the transmission should be performed. Separately, the GP indication may be signaled to the UE.

[060] The GP can be positioned before the UpPTS. The UE may receive information about a home position from the UpPTS through the common PDCCH. The UE may use the UpPTS home position as an unchanged GP end position or the UE may determine the GP end position based on the UpPTS home position.

[061] The GP may be present only in one partition or may be present between partitions. The position and duration of the GP may not be limited. It may be possible for GP to be present between partitions when a DL partition and a UL partition are contiguously present. For example, the GP can be present between a DL partition and a UL partition.

[062] A method for forming a GP for each UE or for each UE group can be configured. The GP configuration can be common to the cell or can be predefined.

[063] Each UE or UE group can be configured with a GP, and in this case, more or fewer cell-specific GPs can be configured than GPs signaled to each UE or UE group. For example, when the number of UE GPs is less than common group or cell-specific GPs, an additional resource can be used as a GP according to dynamic indication, and when the number of UE GPs is greater than specific GPs cell or group common, an additional GP can be formed according to a predetermined rule.

(i) When GP is kept constant

[064] A GP of a UE can be kept constant and may not be affected by a common PDCCH after the GP is configured once. For example, a cell common GP or group common GP transmitted in a system information block (SIB) or similar cannot be changed by a common PDCCH. Furthermore, the appointment of a GP in the common PDCCH can be omitted.

[065] For example, when a GP has 5 symbols and a partition has 14 symbols, D, U, or reserved with respect to 9 symbols may be indicated. Additionally, GP can be configured for each subframe or for each set of partitions. The GP configuration can be provided as a fallback configuration. For example, the GP configured in fallback can always be assumed relative to a common PDCCH. Fixed DL, UL, GP or reserved, configured in fallback, can be assumed and thus the corresponding indication can be omitted from the common PDCCH.

(ii) When GP is Modifiable by Common PDCCH

[066] A GP of a UE may be modifiable by a common PDCCH. There may be no problem when the UE normally receives the common PDCCH, but there may be a problem in terms of GP configuration when the common PDCCH is not able to be received.

[067] Thus, a network needs to notify the UE about a minimum GP and a maximum GP supported by a cell. The minimum GP can be set not to be changed by the common PDCCH. For example, the minimum GP could be 0.

The. Fallback Operation When Common PDCCH is Lost

[068] Upon determining that the partition type indication is not received by the UE or is not transmitted, the UE may maintain a more recently indicated partition type.

[069] Furthermore, when a specific partition type is preconfigured for the UE via semi-static signaling and the UE does not indicate the partition type or is not capable of receiving the partition type indication, a partition type pre-configured via semi-static signaling can be used.

[070] Best/worst case GPs, used for fallback, can be defined. When a common PDCCH is set to indicate the best GP, a GP flagged for fallback can also be set as the best GP. When the common PDCCH is set to indicate the worst GP, a GP flagged for fallback can also be set to the worst GP.

[071] A best/worst case GP, which is applied for fallback, can be predefined or can be configured by a network. This may be necessary to define a UE operation when the fallback configuration is applied.

(2) When All UEs in the Cell Use the Same GP

[072] An environment in which all UEs in a cell use the same GP can be considered. A size of a DwPTS in which a UE receives a signal and a size of an UpPTS in which the UE transmits a signal may be the same with respect to all UEs or may be different for UEs.

[073] When a DwPTS/UpPTS size is different for each UE, a PTS of each UE can be configured to be sufficiently placed in a partition type indicated by the PTS. For example, even if a DwPTS/UpPTS size is different for each UE, the DwPTS/UpPTS size of all UEs can be a size of a PTS in which UL/DL transmission and reception are enabled without change in a UE -Indicated group of partition type commonly. Alternatively, in reality, the DwPTS/UpPTS size of all UEs may be the same

(3) When GP is different for each UE

[074] An environment in which all UEs in a cell are capable of using different GPs can be considered. A size of a DwPTS in which a UE receives a signal and a size of an UpPTS in which the UE transmits a signal may be the same for all UEs or may be different for each UE.

[075] By notifying UEs about GP information through a common PDCCH, a network can configure the final positions of DwPTSs of all UEs to be the same. For example, a DwPTS end position may be the last point, the first point, or the intermediate point between the DwPTS end points of the UEs in a cell.

(i) When the last endpoint of the DwPTS is indicated

[076] The end position of the DwPTS indicated by the network may be the last point among the end points of the DwPTSs of the UEs in a cell. Consequently, an end position of a DwPTS of a specific UE may be earlier than the end position of the DwPTS indicated via the common PDCCH. In this case, the UE may first terminate DL reception and therefore may transmit UL data for an assured period of time or may transmit UL data only in an UpPTS.

(ii) When the Previous DwPTS End Point is Indicated

[077] The end position of the DwPTS indicated by the network may be the first point among the end points of the DwPTSs of the UEs in a cell. Consequently, an end position of a DwPTS of a specific UE may be later than the end position of the DwPTS indicated via the common PDCCH. In this case, when an UpPTS home position of a UE is within a GP, the corresponding UE can transmit an UpPTS on the UL without change, and when the UpPTS home position is not within the GP, the UE can shorten the UpPTS and transmit the UpPTS on the UL or it can ignore the UL transmission on the corresponding UpPTS.

(iii) When the final position of the average DwPTS is indicated

[078] The end position of the DwPTS indicated by the network may be a midpoint between the end points of the DwPTSs of the UEs in a cell. Consequently, an end position of a DwPTS of a specific UE may be later or earlier than the end position of the DwPTS indicated through the common PDCCH. In consideration of this situation, two types of UpPTS can be defined for a short UpPTS and a long UpPTS and the UE can prepare transmission with respect to two types of UpPTS.

3. Handling Different Numerologies and Partition Sizes

[079] When the numerology of a DwPTS, an UpPTS or similar, which is transmitted and received by a UE, is changed, a partition size may also be changed. According to the fact that if a partition type indicated through a common PDCCH is indicated based on the numerology that is currently used by the UE or is indicated based on the reference numerology, an operation of the UE and a partition used can be changed .

[080] For example, reference numerology as a reference for indicating a type of partition can be defined / configured. When the partition type is indicated based on the reference numerology, the UE may change and interpret the indicated partition type according to the numerology used by the UE. The UE may change a partition size indicated based on the reference numerology by the common PDCCH to a partition size corresponding to the numerology used by the UE and may apply the changed partition size.

[081] As another example, when a network indicates a partition type, the network may indicate a partition type according to the numerology used by the UE. In this case, the UE can apply the partition type indicated by the network without change instead of separately calculating a partition size.

4. Periodic Resource Configuration

[082] Among the resources required to maintain a UE's connection to a network, there may be resources that are not clearly defined or a partition type of which is not defined. To use these resources, the network can signal a configuration of corresponding resources using a common PDCCH or essentially define a static configuration regarding the use of the corresponding resources.

(1) CSI-RS

[083] To receive a CSI-RS by the UE, the following methods can be considered. (i) For example, the UE can be set to always receive a periodic CSI-RS. Without separate indication for CSI-RS reception, the UE can assume that periodic CSI-RS is always transmitted over a network and can operate. (ii) As another example, the UE may pre-know the candidate resources on which a periodic CSI-RS is to be transmitted and the network may notify the UE as to whether a CSI-RS is actually transmitted to a corresponding resource via the common PDCCH . In this case, the load can be reduced compared to the case where the UE always receives the CSI-RS, but the UE needs to properly receive the common PDCCH to receive the CSI-RS.

[084] The network can also configure methods (i) and (ii) according to a channel situation.

[085] For example, CSI-RS can be classified into two types. The network can distinguish between a guaranteed CSI-RS in which transmission is assured and a potential CSI-RS in which transmission must be enabled and can transmit a CSI-RS configuration. Guaranteed CSI-RS can always be transmitted without indication via a common PDCCH and potential CSI-RS transmission can be activated via a common PDCCH or other control signals.

[086] The guaranteed CSI-RS can be used for periodic CSI reporting and the potential CSI-RS can also be used for an aperiodic CSI report that is triggered as needed.

[087] Both guaranteed CSI-RS and potential CSI-RS can be used for periodic / aperiodic CSI measurement.

[088] Alternatively, the UE can selectively use the two types of CSI-RSs according to the cases.

(2) Free Concession Resource (Grand-Free)

[089] In NR, a concession-free feature in which a UE performs UL transmission without DCI reception corresponding to the UL concession can be configured.

[090] For example, there may be an always lease-free resource that is always used as a lease-free resource and a flexible lease-free resource that is configured as a lease-free resource according to dynamic indication through a PDCCH common.

[091] Even if the UE does not receive indication of a flexible resource, the UE can use the resource always free of concession.

[092] For example, the always grant-free feature can help the flexible grant-free feature.

[093] In a state in which the UE pre-knows candidates of all grant-free resources, the network may indicate the grant-free resource that should be used by the corresponding UE through a common PDCCH. In this case, when properly receiving the common PDCCH, there may be a limit to which the UE is able to use the grant-free resource, but the grant-free resource in a system can be minimized.

[094] The network may determine a UE group that is capable of attempting to access each lease-free resource and may also notify only the corresponding group about the lease-free resource via the common PDCCH. In this case, the common PDCCH may include identifying information on UE(s) that is capable of accessing the corresponding grant-free resource.

[095] The UE that is able to access the corresponding concession-free resource can be determined according to the priority. For example, priority may be determined based on a failure rate in the number of access attempts, or it may be determined based on the size/urgentity of UL data to be transmitted.

[096] This method for configuring permanent (or fixed)/flexible resources can also be applied to a semi-static resource such as a Radio Resource Management Reference Signal (RRM-RS) resource, a radio channel resource, random access (RACH) and a synchronization signal blocking (SS) feature.

[097] More characteristically, in the case of RRM-RS, a fixed resource can be used for measuring neighboring cells and a flexible resource can be used for measuring service cells. Transmit/receive points (TRPs) can exchange fixed resource configurations with each other and can configure the exchanged configurations for a UE.

[098] The fixed resource can be configured with a longer period than the flexible resource and the period of the fixed resource can influence the delay / accuracy of the neighboring cell measurement. Regarding a neighboring cell with an excellent measurement result equal to or greater than a threshold value, the UE can be configured to perform measurement on the flexible resource of the neighboring cell. To perform measurement on the flexible resource of the neighboring cell, the UE can read a common PDCCH of the neighboring cell. For example, a serving cell may signal information about a common PDCCH configuration of the neighboring cell and information about a method for transmission such as a period for the UE or the neighboring cell to broadcast the corresponding information through a SIB or the like.

[099] Furthermore, the neighboring cell measurement report using the UE using the flexible feature can be triggered by a network. For example, flexible features can be additionally used only in network-driven aperiodic RRM reports.

<Summary of Partition Type Indication and Additional Proposals>

[0100] Additional proposals, in addition to the above descriptions, are described below.

[0101] To design a common group PDCCH for partition type indication, potential differences in NR compared to improvements in LTE TDD for DL-UL interference management and traffic adaptation (LTE eIMTA) need to be considered. For example, it may be necessary to consider that different GP lengths are configured for the respective UEs in NR. Such consideration may be more important when different UEs use different numerologies or relate to different usage scenarios. Additionally, it may be necessary to consider indicating a partition structure in an NR network that provides multiple numerologies.

[0102] It may also be necessary to consider a relationship between a semi-static configuration and a dynamic partition type indication and, for example, the dynamic indication may replace the semi-static configuration for measurement for a more flexible design of an NR system. than LTE.

1. UE-specific GP configuration

[0103] In an unpaired spectrum in which UL and DL are used in a TDM manner, it may be general to assume that a network operates on either UL and DL at once regardless of a numerology used.

[0104] In an LTE system, a cell-specific GP length can be configured for all UEs. However, it may be inefficient to configure the same GP length for all UEs in a cell in the NR system. For example, when a GP length is configured as 2 symbols based on numerology corresponding to 15 kHz SCS, the corresponding GP length can correspond to 8 symbols in numerology corresponding to 60 kHz SCS. As such, the GP length corresponding to 8 symbols may be a period of time longer than a GP length that is actually needed for a UE operating based on 60 kHz SCS and a radio resource may be wasted.

[0105] In consideration, different propagation delays, different numerologies, and/or different QoS requirements, a UE-specific GP configuration may be more appropriate than a common cell/UE specific GP configuration in NR. To use a UE-specific GP, a maximum GP supported by a network can be signaled to a UE. Furthermore, the UE-specific GP can be determined and flagged.

[0106] As such, the NR may support a UE-specific GP configuration.

2. UE Operation according to Partition Type

[0107] When the partition type indication is provided, a UE may determine a DL symbol, a UL symbol and/or other symbols (e.g., flexible symbols) from the partition type indication. Detailed contents in the partition type indication may indicate, for example, one of the predefined partition patterns, DL / UL bitmap and/or DwPTS and UpPTS lengths, but are not limited to them. To indicate a suitable partition type, it may be necessary to define the handling of different GP lengths.

[0108] In signaling a DL portion (resource) and a UL portion (resource) to a common group PDCCH, two approaches can be broadly considered. (i) A first method is to indicate the base case for the DL/UL portions by a network. For example, DL/UL portions can be indicated according to the minimum GP supported by the network. In this case, a UE with a GP length greater than the minimum GP can determine where an additional required GP is positioned, based on the indicated partition structure. (ii) A second method is to indicate the worst case for the DL/UL portions by a network. For example, DL/UL portions can be indicated according to the maximum GP supported by the network. In this case, separate mechanisms for using other resources (e.g., flexible) indicated by the partition indication may be used for DL or UL for a UE with a GP less than the maximum GP.

[0109] Additionally, it may be necessary to determine where a GP indicated by a partition type is positioned relative to UEs with different GP lengths.

[0110] For example, a UE may assume that a GP is always terminated after the DL portion. When partition 1 is dedicated for DL and partition 2 positioned after partition 1 is dedicated for UL, the GP can be positioned at the beginning of partition 2 dedicated for UL. When the minimum GP is indicated according to the partition type indication, a UE with GP greater than the minimum GP can reduce the UL portion to guarantee additional GP.

[0111] As another example, a UE may assume that a GP is always positioned before starting the UL portion. When partition 1 is dedicated to DL and partition 2 is dedicated to UL, the GP can be placed in a DL partition. When the minimum GP is indicated by the partition type indication, a UE with a GP greater than the minimum GP can reduce the DL portion to guarantee additional GP.

[0112] Alternatively, a GP can be generated by dynamic programming alone. For example, a UE may create a GP between the DL reception end (e.g., control channel end, DL data end, or measurement end) and the start of UL transmission. However, this method may complicate a UE operation. Therefore, it may be more desirable to determine the insertion of a GP at the end of DL or beginning of UL.

[0113] Based on the above discussion, it may be necessary to determine whether a partition structure indicated by a common PDCCH is formed, assuming the best case GP or the worst case GP, which is supported by a network. Furthermore, the GP can be positioned after the DL portion or before the UL portion.

3. Treatment of Different Numerologies and Different Partition Sizes

[0114] A partition size can be related to numerology. When the numerology of DL or UL is changed, an actual effect may be changed depending on a relationship between numerology used in partition type indication and numerology used in control/data transmission. The common PDCCH can indicate a partition type and the numerology used as a reference for indicating partition type can be important for a UE.

[0115] For example, the partition type indication can be transmitted based on the reference numerology. Based on the reference numerology, the UE can interpret the indicated partition type as the UE's numerology and can estimate a suitable size of a partition, regardless of the numerology used in the UE.

[0116] As another example, a common PDCCH may indicate a partition type using the numerology of a UE. In this case, the UE may not need to re-estimate a partition type and a partition size. In this case, the common PDCCH may need to be transmitted separately by the UE according to the numerology.

[0117] However, as described above, a network can operate in one direction (e.g., DL/UL) in a single numerology used independently. It may therefore be advantageous to convey partition type indication based on reference numerology. For example, when a network operates numerology with 15 kHz and 60 kHz SCS and transmits partition type indication based on 15 kHz SCS, a UE using 60 kHz SCS may interpret a different number of DL portions (e.g. , DL symbols) and UL portions (e.g., UL symbol) of the indication based on symbol-level alignment or partition-level alignment.

[0118] As a detailed example, FIG. 2 illustrates 1 partition based on 15 kHz SCS and 1 partition based on 60 kHz SCS. That is, the duration of 1 symbol (i.e., time duration) based on the 15 kHz SCS may be the same as the durations of 4 symbols based on the 60 kHz SCS. Assuming that the 15 kHz SCS-based partition format indication indicates a partition shape with [Symbol 0 = DL, Symbol 2 = DL..., Symbol 13 = UL], a UE that operates based on 15 kHz SCS 60 kHz may interpret Symbol 0 = DL as 4 consecutive DL symbols, may interpret Symbol 2 = DL as 4 consecutive DL symbols, and may interpret Symbol 13 = UL as 4 consecutive UL symbols (e.g. symbol level alignment) . According to partition-level alignment, a partition having a given format can be interpreted as being repeated four times.

[0119] Such 15 kHz and 60 kHz SCS is exemplary and the same method can be applied to various SCSs that were mentioned above with reference to Table 1 above. For example, when SCS 1 is A kHz, SCS 2 is B kHz and a relation of B = A * M is satisfied (where A, B and M are a natural number), 1 OFDM symbol length based on SCS 1 can be the same as the M SCS 2-based OFDM symbol lengths.

[0120] A common group PDCCH may indicate a partition format based on the reference numerology, regardless of the actual numerology used in a UE.

[0121] The reference numerology can be indicated by a network (e.g. RRC signaling) or pre-configured. For example, the minimum SCS among multiple SCSs configured for UEs across the network can be used as the reference numerology.

4. UE Operation Related to Periodic Resource Configuration

[0122] In general, NR can be directed to avoid permanent over signal or periodic transmissions, some periodic configurations may be necessary for some operations. For example, a synchronization signal (SS) block, a PRACH configuration, a CSI-RS configuration, an RRM-RS configuration, and/or lease-free resources may be configured periodically.

[0123] In terms of UE performance, it may be desirable to secure semi-statically configured resources. However, in terms of flexibility, dynamic resource exchange between DL/UL/Reserved may be limited. In consideration of these advantages and disadvantages, the following two approaches can be considered. (i) For example, when a semi-static configuration is provided, a UE may assume that resources are used in accordance with a corresponding configuration. For example, a group common PDCCH can be defined to not change a resource type configured by a semi-static configuration. This method can be advantageous for improving UE performance and simplifying a fallback operation. (ii) As another example, a resource indicated by a semi-static configuration can be considered as a potential candidate for a semi-static resource. When a common group PDCCH is not activated, a potential candidate may be considered secured. When the group common PDCCH is enabled, the semi-static feature can be used only when it is being checked by the group common PDCCH. According to this method, it may be advantageous to improve network flexibility. However, even if a partition type is not changed in a semi-statically configured fallback configuration, it may be necessary to transmit the group common PDCCH and thus signaling overhead may be increased.

[0124] In consideration of the advantage/disadvantage of (i) and (ii), the semi-static feature can distinguish between a first group and a second group, the first group can fulfill operation (i) and the second group can fulfill operation (ii). The minimum performance of the UE in measurement and the minimum opportunities for a PRACH can be ensured through the first group and the second group can be used in an on-demand manner.

[0125] A common PDCCH may replace at least a portion of a semi-statically configured resource. Semi-static configurations with different priority than the common PDCCH, for example, a guaranteed resource and a flexible resource can be considered.

<Partition Shape Indicator (SFI) for Different Numerology>

[0126] As described above, a partition format indicated by a group common PDCCH may include downlink (D), unknown (X), and/or uplink (U) symbols.

[0127] A plurality of partition formats can configure various combinations and a partition format combination can be configured for a UE through higher layer signaling or the like.

[0128] A plurality of numerologies can be configured for a UE. A group common PDCCH SFI may indicate an index of a configured or UE partition format table (or partition format combinations/sets). When a plurality of BWPs and a plurality of numerologies are configured for 1 EU, there may be a method for indicating partition formats for the respective numerologies. For example, numerologies can be configured separately for the respective BWPs and, in this case, partition formats can be indicated for the respective BWPs.

1. UE Partition Format Table for MultiNumerology (1) Single Column Table

[0129] A partition format table configured for a UE may be a set of partition formats from a plurality of numerologies.

[0130] For example, when the SCS configured for a UE is 15 and 30 kHz and the partition format table configured for the UE includes 16 total entries, entries 1 through 8 may correspond to SCS formats of 15 kHz and inputs #9 to #16 can correspond to 30 kHz SCS partition formats. An SFI of a group common PDCCH may indicate a partition format index appropriate to the numerology used by the UE.

[0131] When a plurality of BWPs are activated in a UE and the respective BWPs have different numerologies, partition formats of the plurality of BWPs can be indicated through an SFI. For example, the index deviation between partition formats to be applied to numerologies can be used to indicate partition formats of a plurality of BWPs through 1 SFI.

[0132] As in the example above, it can be assumed that when the SCS configured for a UE is 15 and 30 kHz and the partition format table configured for the UE includes 16 of the total entries, entries from #1 to #8 correspond to 15 kHz SCS partition formats and entries #9 to #16 correspond to 30 kHz SCS partition formats. In this case, when an SFI indicates an index of #1 to #8, a UE may acquire an unchanged partition format using an index of the SFI at a 15 kHz SCS BWP, but may interpret an index of SFI+8 at a 30 kHz SCS BWP (i.e., index offset 8 is applied) to acquire a partition format of a 30 kHz SCS BWP.

(2) Multi-Column Table

[0133] A mother table that is a reference to a partition format table configured for a UE or a partition format table configured for the UE may correspond to a set of partition formats from a plurality of numerologies.

[0134] For example, as shown in Table 4, columns can be defined for the respective numerologies and columns can define partition formats appropriate for the corresponding numerologies. [Table 4]

[0135] When a plurality of BWPs are activated in a UE and the respective BWPs have different numerologies, even if an SFI is indicated, a UE may recognize partition formats of respective numerologies in a row corresponding to the SFI.

2. Automatic Expansion/Shrink of Partition Format

[0136] As another example of the present invention, a UE partition format table of a numerology (e.g., reference numerology) can be defined and a rule can be defined to expand or collapse the table corresponding to the numerology. In this case, it may not be necessary for numerology to separately indicate a partition format for a network, and thus the signaling overhead may be advantageously reduced.

(1) Expansion Rule

[0137] When a UE uses SCS greater than reference SCS as a reference of the UE partition format table, the number of partitions based on UE SCS may be increased compared to the number of partitions based on reference SCS included in the same time period. For example, 4 partitions based on 15 kHz reference SCS can have the same duration as 8 partitions based on 30 kHz SCS. Therefore, the UE needs to expand an indicated partition format based on the reference SCS in accordance with the SCS used by the UE. Here, expanding a partition format refers to expanding the number of symbols included in a partition, but does not refer to expanding the absolute length of time. For example, when the network indicates the time direction of 0.5 ms including 14 symbols, the UE can be interpreted as being expanded to include 28/56/... symbols in the same time duration of 0.5 ms.

[0138] - Option 1: The downlink (D), unknown (X), and uplink (U) directions of symbols of the respective partition formats indicated by the reference SCS may be maintained for the duration of time occupied by the format corresponding partition. For example, it can be assumed that the reference SCS is 15 kHz and a partition format indicated by the reference SCS includes 4 D symbols, 6 X symbols and 4 U symbols and the SCS used by the UE is 30 kHz. In this case, the 4 D symbols, 6 X symbols and 4 U symbols included in the indicated partition format can be expanded to 8 D symbols, 12 based on 30 kHz SCS. That is, the time duration of 4 D symbols based on 15 kHz SCS is the same as the time duration of 8 D symbols based on 30 kHz SCS, and thus the UE can interpret 4 D symbols indicated with 15 kHz SCS based 8 D symbols based on 30 kHz SCS. In this case, the number of D symbols can be expanded, but the sum of the time durations of D symbols in a partition can be maintained. The UE can interpret X symbols and U symbols in the same way.

[0139] - Option 2-1: When a UE expands each D symbol and each U symbol, different rules may be applied according to the presence of an X symbol before and after a corresponding symbol. For example, when a symbol D, one whose back portion is a symbol When a symbol U, one whose front portion is an X symbol, is expanded, the UE may configure 1/2 of a front portion of the expanded U symbol as reference is 15 kHz and the number of D symbols, X symbols and U symbols is 4, 6 and 4 respectively, the 4 D symbols can be expanded to 4 D symbols + 4 6 indicated X symbols can be expanded to 12 X symbols. 4 indicated U symbols can be expanded to 4 X symbols + 4 U symbols based on 30 kHz SCS. As a result, a partition format can be interpreted as 4 D symbols + 20 X symbols + 4 U symbols. Therefore, the time duration corresponding to an X symbol can be further increased compared to the indicated partition format.

[0140] - Option 2-2: When the SCS used by a UE is equal to or greater than 4 times the reference SCS and a D symbol, one whose rear portion is an X symbol, is expanded, a UE can configure 1/ 4 of a rear portion of the expanded D symbol as an X symbol. When a U symbol, whose front portion is an X symbol, is expanded, 1/4 of a front portion of the expanded U symbol can be configured as an

[0141] - Option 2-3: When the SCS used by a UE is equal to or greater than 8 times the reference SCS symbol and a D symbol, the rear portion of which is an X symbol, is expanded, a UE can configure 1 /8 of a rear portion of the expanded D symbol as an X symbol. When a U symbol, whose front portion is an X symbol, is expanded, 1/8 of a front portion of the expanded U symbol can be configured as an

[0142] - Option 2-4: When the SCS used by a UE is equal to or greater than 16 times the reference SCS symbol and a D symbol, the rear portion of which is an X symbol, is expanded, a UE can configure 1 /16 of a rear portion of the expanded D symbol as an X symbol. When a U symbol, whose front portion is an X symbol, is expanded, 1/16 of a front portion of the expanded U symbol can be configured as an

[0143] - Option 3-1: When the SCS used by a UE is equal to or greater than twice the reference SCS and an X symbol is expanded, an expanded X symbol format may also be differently determined if the D/ U are present before and after the symbol X. For example, when a symbol Furthermore, when an X symbol, the rear portion of which is a U symbol, is expanded, the UE may configure 1/2 of a rear portion of the expanded

[0144] - Option 3-2: When the SCS used by a UE is equal to or greater than 4 times the reference SCS and an X symbol is expanded, a format of the expanded X symbol may also be determined differently if the symbols D/U are present before and after the symbol U. Furthermore, when an X symbol, the back portion of which is a U symbol, is expanded, the UE may configure a 1/4 back portion of the expanded

[0145] - Option 3-3: When the SCS used by a UE is equal to or greater than 8 times the reference SCS and an X symbol is expanded, a format of the expanded X symbol can also be determined differently according to whether the D/U symbols are present before and after the symbol X. For example, when a symbol symbol U. Furthermore, when a symbol X, the rear portion of which is a U symbol, is expanded, the UE may configure a 1/8 rear portion of the expanded symbol

[0146] - Option 3-4: When the SCS used by a UE is equal to or greater than 16 times the reference SCS and an X symbol is expanded, a format of the expanded X symbol can also be determined differently according to the symbols D/U present before and after the symbol Furthermore, when a symbol X, the back portion of which is a U symbol, is expanded, the UE may configure 1/16 of a back portion of the expanded

(2) Reduction Rule

[0147] When a UE uses smaller SCS than reference SCS, a smaller number of partitions/symbols than the number indicated based on the reference SCS may be present for the same duration of time. For example, 8 partitions based on 30 kHz reference SCS can have the same time duration as 4 partitions based on 15 kHz SCS. Therefore, the UE needs to expand an indicated partition format based on the reference SCS in accordance with the SCS used by the UE.

[0148] - Option 1-1: When SCS (hereinafter UE SCS) used by a UE is smaller than the reference SCS and even one of D or U is present in a symbol set of the reference SCS to be reduced to 1 symbol of the UE SCS, the corresponding symbol set can be interpreted as a D symbol or U symbol based on the UE SCS.

[0149] - Option 1-2: When the UE SCS is small and is equal to or less than 1/2 times the reference SCS and a portion of D or U in a symbol set of the reference SCS to be reduced to 1 UE SCS symbol is equal to or greater than 1/2, the corresponding symbol set can be configured to be a UE SCS D or U symbol. When the portion of D or U is less than 1/2, the corresponding symbol set can be configured to be an X symbol of the UE SCS. For example, when a partition format DDDXXXXXXXXUUU based on the 30 kHz reference SCS is indicated, 2 symbols such as |DD|DX|XX|XX|XX|XU|UU| can be grouped to define 1 15 kHz UE SCS symbol. |DX| can be converted to D and |XU| can be converted to U. A 30 kHz SCS-based DDDXXXXXXXXUUU partition format can be converted to a DDXXXUU partition format based on the 15 kHz UE SCS.

[0150] - Option 1-3: When the UE SCS is small and is equal to or less than 1/4 times the reference SCS and a portion of D or U in a symbol set of the reference SCS to be reduced to 1 UE SCS symbol is equal to or greater than 3/4, the corresponding symbol set can be configured to be a UE SCS D or U symbol. When the portion of D or U is less than 3/4, the corresponding symbol set can be configured to be an X symbol of the UE SCS.

[0151] - Option 1-4: When the UE SCS is small and is equal to or less than 1/8 times the reference SCS and a portion of D or U in a symbol set of the reference SCS to be reduced to 1 UE SCS symbol is equal to or greater than 7/8, the corresponding symbol set can be configured to be a UE SCS D or U symbol. When the portion of D or U is less than 7/8, the corresponding symbol set can be configured to be an X symbol of the UE SCS.

[0152] - Option 1-5: When the UE SCS is small and is equal to or less than 1/16 times the reference SCS and a portion of D or U in a symbol set of the reference SCS to be reduced to 1 UE SCS symbol is equal to or greater than 15/16, the corresponding symbol set can be configured to be a UE SCS D or U symbol. When the portion of D or U is less than 15/16, the corresponding symbol set can be configured to be an X symbol of the UE SCS.

[0153] - Option 2-1: When the UE SCS is smaller than the reference SCS and even an X is present in a reference SCS symbol set to be reduced to 1 UE SCS symbol, the set corresponding symbol symbol can be converted into a UE SCS X symbol.

[0154] - Option 2-2: When the UE SCS is small and is equal to or less than 1/2 times the reference SCS, a set of reference SCS symbols to be reduced to 1 UE SCS symbol includes D and X or X and U, and a portion of X in the symbol set is equal to or greater than 1/2, the corresponding symbol set can be configured to be an X symbol of the UE SCS. When the portion of X in the symbol set is less than 1/2, the corresponding symbol set can be configured to be a D or U symbol of the UE SCS.

[0155] - Option 2-3: When the UE SCS is small and is equal to or less than 1/4 times the reference SCS, a set of reference SCS symbols to be reduced to 1 UE SCS symbol includes D and X or X and U, and a portion of X in the symbol set is equal to or greater than 3/4, the corresponding symbol set can be configured to be an X symbol of the UE SCS. When the portion of X in the symbol set is less than 3/4, the corresponding symbol set can be configured to be a D or U symbol of the UE SCS.

[0156] - Option 2-4: When the UE SCS is small and is equal to or less than 1/8 times the reference SCS, a set of reference SCS symbols to be reduced to 1 UE SCS symbol includes D and X or X and U, and a portion of X in the symbol set is equal to or greater than 7/8, the corresponding symbol set can be configured to be a UE SCS symbol X. When the portion of X in the symbol set is less than 7/8, the corresponding symbol set can be configured to be a D or U symbol of the UE SCS.

[0157] - Option 2-5: When the UE SCS is small and is equal to or less than 1/16 times the reference SCS, a set of reference SCS symbols to be reduced to 1 UE SCS symbol includes D and X or X and U, and a portion of X in the symbol set is equal to or greater than 15/16, the corresponding symbol set can be configured to be a UE SCS symbol When the portion of X in the symbol set is less than 15/16, the corresponding symbol set can be configured to be a D or U symbol of the UE SCS.

[0158] - Option 3: When the UE SCS is smaller than the reference SCS and a reference SCS symbol set to be reduced to 1 SCS symbol includes all D, X and U, the corresponding symbol set may be configured to be a UE SCS X symbol.

[0159] - Option 4-1: When the SCS of UE is smaller than the reference SCS and D and U are mixed into a symbol set of the reference SCS to be reduced to 1 SCS symbol, the corresponding symbol set can be configured as a UE SCS X symbol.

[0160] - Option 4-2: When the UE SCS is smaller than the reference SCS and D and U are mixed into a reference SCS symbol set to be reduced to 1 SCS symbol, the UE can recognize the set symbol set as an error and may disregard a partition format of a partition included in the corresponding symbol set.

(3) Reference Numerology Pattern

[0161] There may be several methods for notifying a UE about reference numerology to configure reference numerology over a network.

[0162] - Option 1: For example, when notifying a UE about a partition format table (e.g., combinations of partition formats), the network may also notify the UE about the reference numerology referred to by the partition format table. partition.

[0163] However, when the standard reference numerology is defined and a partition format table based on the standard reference numerology is used, the network may not separately notify the UE about reference numerology.

[0164] Standard reference numerology can be defined, for example, as follows, but is not limited to this. (i) The lowest numerology among configurable numerologies for a UE may be selected as the default reference numerology. For example, assuming that the configurable numerology SCS for the UE is 15, 30, 60 and 120 kHz, the network may define 15 kHz as the default reference numerology. (ii) The highest numerology among configurable numerologies for a UE may be selected as the default reference numerology. For example, assuming that the configurable numerology SCS for the UE is 15, 30, 60 and 120 kHz, the network may define 120 kHz as the default reference numerology. (iii) As another example, 15 kHz may be fixed in standard reference numerology.

[0165] - Option 2: As another example, the network may define numerology of a control channel used to indicate an index in a partition format table configured for the UE as reference numerology.

[0166] - Option 3: As another example, numerology of a band in which a corresponding partition format is actually used can be defined as reference numerology.

3. Inherit previous SFI

[0167] The method for converting a partition format depending on the SCS of a UE by the UE when a partition format is transmitted based on the reference SCS (or reference numerology) has been described above.

[0168] When a carrier is changed after the UE applies a specific SFI and the numerology of the changed BWP/carrier is different from the previous BWP/carrier, if the specific SFI is reapplied by the UE it can be issued according to the conversion rule of aforementioned partition format.

[0169] - Option 1: For example, when the numerology of the changed/carrier BWP is different from a previous BWP/carrier, the UE may disregard a pre-indicated partition format and may perform a fallback operation until a next SFI of a point of time at which the BWP/carrier is changed.

[0170] - Option 2: As another example, when the numerology of the altered BWP/carrier is different from a previous BWP/carrier, the UE may apply a partition format that is modified according to the altered numerology until a next SFI of a point of time at which the BWP/carrier is changed. However, in the case of a format that is not supported by the modified partition format, the UE may disregard the corresponding partition format and may perform a fallback operation.

4. Inherit previous SFI in Beam Switching

[0171] A plurality of beams may be configured for a UE and, as necessary, beam switching may occur. As such, when a beam is switched, the UE may need to select whether an existing applied SFI is applied to a new beam without change.

[0172] - Option 1: The UE may disregard an existing partition format until a next SFI from a time point at which beam switching occurs and may perform a fallback operation.

[0173] - Option 2: The UE may comply with an existing partition format until a next SFI from a time point at which beam switching occurs. When the numerology of the switch is different from a previous bundle, the UE may apply a modified partition format in accordance with the changed numerology. However, in the case of a format that is not supported by the modified partition format, the UE may disregard the corresponding partition format and may perform a fallback operation.

5. Defining Reference Numerology

[0174] To carry out a method for modifying a partition format according to numerology as described above, it may be important to define the reference numerology. When the programming/programmed carrier numerologies are the same in cross-carrier programming, there may be no problems applying the previously mentioned partition format modification rule. However, a plurality of BWPs may be configured for the respective carriers and the numerologies may be different for the respective BWPs.

[0175] When an SFI is defined/signaled for each cell (i.e., carrier) in a group common PDCCH transmitted through a P Cell, it may be necessary to define the reference numerology of an SFI for each cell.

[0176] For example, in the case of Cell P, the numerology for transmitting the group common PDCCH may correspond to the reference numerology.

[0177] In the case of an S Cell, the following options may be considered.

[0178] - Option 1: A partition format can be indicated based on the numerology of a currently activated BWP.

[0179] - Option 2: The numerology of a first BWP activated in the S Cell can be defined as the S Cell reference numerology.

[0180] - Option 3: The numerology of a standard S Cell BWP can be defined as the S Cell reference numerology.

<Partition Format Indication for Multiband>

[0181] Partition format indication may be used primarily in a TDD environment, but may be used to indicate a partition format in an FDD band. Each FDD band may generally be fixed to D or U, but a network may allow each FDD band to be used for another use through 'Unknown'. In this case, the network needs to indicate a D-Band and U-Band partition format in an FDD and therefore there is a need for a method for this purpose.

[0182] In an LTE-NR coexistence environment, a network may allocate a supplemental uplink (SUL) that temporarily uses an LTE UL band for an NR user for an additional UL band for an NR user. In this case, when the NR user operates in a TDD, the network needs to simultaneously indicate an NR TDD band partition format and a SOUTH partition format.

[0183] One such method for simultaneously indicating a partition format for two or more bands is described below.

1. Single Column Table

[0184] For example, a table in which the partition formats of two or more bands (e.g., BWPs) are deployed contiguously in one row can be defined/configured.

[0185] FIG. 3 illustrates combinations of partition formats in accordance with an embodiment of the present invention.

[0186] For example, when a Band1 partition format is represented as SF1 and a Band2 partition format is represented as SF2, a partition format group transmitted to a UE by a network may be in the form of SF1 + SF2 + Partition format group can be an entry in the partition format table, and these entries can be grouped together to configure the partition format table.

[0187] The network may configure partition format combinations corresponding to the partition format table for the UE via higher layer signaling, and then notify the UE of a partition format combination of a specific input via a common PDCCH group.

[0188] Furthermore, SCS may be different for each band, even on one input. Therefore, the number of partitions of the respective SFs may also be different.

[0189] The partition format table can be configured in such a way that partitions corresponding to the same specific time duration are implemented contiguously between the partition formats of the respective bands, and then partitions corresponding to the same specific time duration are implemented next are implemented contiguously. For example, it can be assumed that Band 1 numerology is 60 kHz SCS and Band 2 numerology is 15 kHz SCS. Band 1 can have 4 partitions and band 2 can have 1 partition per 1 ms. When the time duration of a partition format to be notified to a UE by a network is 2 ms, the number of Band1 partitions is 8 for 2 ms and the number of Band2 partitions is 2 for 2 ms. In this case, the network can implement 2-band partition formats in the form of 1 partition of 4 Band1 partitions + 1 Band2 partition + 4 Band1 partitions + 1 Band2 partition.

[0190] For example, the network may deploy 1 partition of 4 partitions + 1 partition of Band2, which corresponds to the same duration of 1 ms, and then may deploy 4 partitions of Band1 + 1 partition of Band2, which corresponds to the next time duration of 1 ms.

[0191] Such partition format deployment can be performed regardless of the number of bands.

[0192] FIG. 4 illustrates combinations of time partition formats in accordance with another embodiment of the present invention. For convenience, it can be assumed that the number of bands is 2 or 3 in FIG. 4. For example, in the case of input 2, Band 1, Band 2 and Band 3 have the same SCS. In the case of input 4, it can be assumed that Band 2 SCS is twice Band 1 SCS and Band 1 SCS is twice Band 3 SCS.

[0193] The method of FIG. 3 or 4 may be used when a network indicates partitions corresponding to the same length of time over a plurality of bands at once.

2. MultiColumn Table

[0194] Figs. 5 and 6 illustrate combinations of time partition formats in accordance with another embodiment of the present invention.

[0195] The partition formats of a plurality of bands can be arranged contiguously in a column, as illustrated in FIG. 3 or 4 but, according to another embodiment of the present invention, a column can be defined for each band and a partition format can be indicated.

3. Multibands that Support Multinumerology

[0196] The method for indicating a partition format of all numerologies to be supported by a band through a partition format table has been described above in relation to embodiments related to Table 4 above. The method of indicating time partition formats of a plurality of bands via a time partition format table has been described in connection with embodiments related to FIGs. 3 to 6.

[0197] The above embodiments may also be combined to consider a method for simultaneously indicating partition formats of all numerologies to be supported for each of the plurality of bands. For example, an embodiment may be formed by combining the embodiments related to Table 4 above and the embodiments related to FIGs. 3 to 6.

[0198] For example, a column may be defined for each band and a subcolumn may be defined for numerologies of the respective bands, and thus a network may indicate partition formats for respective numerologies of a plurality of bands in one row at a time .

[0199] FIG. 7 illustrates a partition format combination in accordance with an embodiment of the present invention.

[0200] In FIG. 7, the number of bands and the number of numerologies of the respective bands can be changed as an example. As the number of bands and/or the number of numerologies of the respective bands are increased, the size of the illustrated time partition format table may also be increased.

4. Reference Numerology Setting

[0201] When partition formats of a plurality of bands are indicated using a table, the numerology of each band needs to be considered. This is because a method for indicating partition formats of respective bands is changed according to the determined reference numerology. Each band can be any of, for example, a DL band, a UL band, a SOUTH band, and a TDD band, but is not limited to them.

The methods considered are described below.

[0202] - Option 1: A partition format indicated by a partition format table can be a partition format according to the numerology of each band. For example, when Band1 is 30 kHz SCS and Band2 is 15 kHz SCS, a partition format of each band can be defined as one partition format for 30 kHz SCS and one partition format for 15 kHz SCS. When partition formats for 30 kHz SCS / 15 kHz SCS are entered into a table, a combination of 30 kHz SCS / 15 kHz SCE partition format or a partition format column for each band can be deployed.

[0203] - Option 2: A partition format can be indicated based on the lowest numerology among numerologies of a plurality of bands. A UE can modify an indicated partition format according to the numerology of each band using the above-mentioned method for partition format expansion.

[0204] - Option 3: A partition format can be indicated based on the major numerology among numerologies configured for a plurality of bands.

[0205] - Option 4-1: The reference numerology can be defined separately and a partition format of each band can be indicated based on the reference numerology.

[0206] - Option 4-2: The reference numerology can be defined separately and partition formats of only some bands can be indicated based on the reference numerology. A partition format according to the numerology of a corresponding band can be indicated for the other band(s). For example, some bands to which reference numerology is applied may be at least one of a DL band, a UL band, a SOUTH band, and a TDD band.

[0207] The reference numerology in options 4-1 and 4-2 can be determined using the method mentioned above for determining reference numerology.

[0208] Although the proposed methods can be implemented independently, some proposed methods can be combined (or integrated). It may be regulated that information indicating whether the proposed methods are applied or not (or information about the rules of the proposed methods) transmitted to a UE in a predefined signal (e.g., a physical layer signal or a higher layer signal) a base station.

<Common Group PDCCH>

[0209] Next, the content and expected payload size of the DCI transmitted over a common group PDCCH are described.

[0210] A method for group common PDCCH signaling is now described. An example of the method for signaling may include a method for allocating and transmitting a reserved resource and a method for configuring and transmitting a search space.

[0211] When information about a partition type is transmitted via the group common PDCCH, whether or not a method for transmitting a partition type to a UE operating with a plurality of CCs is effective is described below.

1. Group Common PDCCH Content

[0212] (1) Partition Format Indication

[0213] The group common PDCCH may be used to notify a UE of a partition format. Partition format can be indicated in various types. A group common PDCCH payload size can be variable according to an indicated partition format type.

[0214] A size of 1 partition (e.g. length in the time domain) can be changed according to numerology. The number of partitions configuring 1 partition can be changed according to numerology.

(i) Partition Type

[0215] The group common PDCCH may indicate a type of at least one partition.

[0216] For example, a space may be classified as shown in Table 5 below, but is not limited to it. [Table 5]

[0217] In the case of D-centric and U-centric partition types, only if a corresponding partition is D-centric or U-centric can it be indicated and therefore a configuration (e.g., downlink and uplink) of an actual symbol included in the corresponding partition needs to be predefined. A DL/UL portion in a D/U-centric partition can be predefined or can be configured by a network. One or more D/U-centric patterns may be present according to a DL/UL feature configuration.

[0218] The use of the reserved/DR partition can be predefined or not. For example, the use of the reserved/DR partition can be predefined through system information, upper layer indication or something similar. When the usage of a reserved/DR partition is not defined, a network may notify a UE of the usage while indicating a partition type through the group common PDCCH or may not indicate the usage if it is not necessary for the UE to know the usage. from the reserved /DR partition. The reserved resource can be configured separately from a partition type. For example, the network may configure a reserved resource via dynamic/semi-static signaling.

(ii) Partition Type Pattern

[0219] A common group PDCCH may indicate a type of plurality of partitions. For example, the group common PDCCH may indicate at least one of the combinations of a plurality of partitions. When a network indicates the respective types of a plurality of partitions one by one, it may be ineffective for a group common PDCCH payload size to be increased and the signaling overhead to be increased. Therefore, the number of partitions to indicate and each partition type can be defined as a pattern and the network can notify the UE about an index of the pattern via the group common PDCCH.

[0220] A plurality of partition type patterns can be defined. For example, the partition type pattern can be defined as [periodicity/partition types or patterns or a set of partition types] but is not limited to these.

[0221] FIG. 8 illustrates partition format patterns in accordance with an embodiment of the present invention. In FIG. 8, DU refers to a symbol, half of which is D symbols and the other half is U symbols.

[0222] In the case of an FDD system, a partition corresponding to D in FIG. 8 may correspond to a partition format of a DL band (e.g., DL BWP) and a partition corresponding to U in FIG. 8 can be interpreted as a partition format for a UL band (e.g., UL BWP). For example, a configuration of a pattern obtained by combining a D partition format and a U partition format for a UE by a base station can be interpreted as a configuration of a pattern obtained by combining a partition format of a DL band ( e.g., DL BWP) and a partition format of a UL band (e.g., UL BWP) for the UE by the base station.

[0223] A plurality of partition type patterns to be used in a corresponding cell or a corresponding group can be defined/configured and a network can notify a UE about patterns to be used among a plurality of partition type patterns. For example, a subset may be signaled to the UE among defined patterns. FIG. 8 illustrates 12 total patterns, and in this case, information indicating that patterns #5 to #8 defined using 2-partition sections among 12 patterns are available can be signaled to the UE. In this case, 4 patterns from #5 to #8 can be reindexed and can be considered as patterns from #1 to #4.

[0224] As such, when a subset of partition type patterns is pre-notified to the UE, the network may sequentially transmit only the indices of the re-indexed patterns to the group common PDCCH. Consequently, the signaling overhead of the group common PDCCH can be reduced. For example, the group common PDCCH may not inevitably cover all 12 standards and may be configured to cover 4 standards, and in this case, a payload size of the group common PDCCH may be reduced.

[0225] Information about the subset of partition type patterns may be transmitted to the UE via a MAC control element (CE) or may be transmitted via the group common PDCCH. Alternatively, the network may predefine a period in which a pattern should be indicated through system information. Alternatively, information about a subset of partition type patterns may be transmitted via UE-specific higher layer signaling.

[0226] A pattern of a long period can be defined in the form in which patterns of short periods are repeated. In this case, in a situation in which the network needs to indicate two partition formats simultaneously, the pattern information in the long period can be advantageously replaced by the pattern information in the short period.

(iii) Symbol Unit Indication

[0227] According to another embodiment of the present invention, a group common PDCCH may indicate a partition type in symbol units configuring a partition. For example, a resource type such as D/U/Reserved in Table 6 below can be applied to symbol units.

[0228] Table 6 below shows an exemplary partition format assuming that 1 partition includes 7 symbols. [Table 6]

(iv) Symbol Pattern

[0229] Although the method for indicating an index of a partition pattern by a group common PDCCH has been described above, the group common PDCCH may indicate an index of a symbol pattern in accordance with another embodiment of the present invention.

[0230] Table 7 below shows an exemplary symbol pattern (or partition format) under the assumption that 1 partition includes 7 symbols. [Table 7]

(2) Other Information

[0231] The group common PDCCH may include further information in addition to partition format information. (iv) Perforation Indication: The group common PDCCH may include perforation information for URLLC. A period used as URLLC can be indicated in partition units or symbol units. (v) Semi-static resource information: The group common PDCCH may include information about a semi-static resource, such as the CSI-RS. For example, the group common PDCCH may indicate information about what a corresponding semi-static resource is, or information about a period, transmission time duration, and the like, when the corresponding semi-static resource has the period.

2. Group Common PDCCH Transmission

[0232] As a method for transmitting a group common PDCCH over a network, a method for configuring and transmitting a search space for the group common PDCCH, and a method for securing and transmitting a resource reserved for the group common PDCCH can be considered.

(1) Group Common PDCCH Transmission Using Reserved Resource

[0233] A network may pre-guarantee a resource (e.g., RE, REG, RB, and CCE) on which a group common PDCCH is to be transmitted.

[0234] The group common PDCCH can also be a control channel and therefore can be deployed in a CORESET. Additionally, it may be desirable to implement a resource position reserved for the group common PDCCH to minimize blocking with other control channels. In particular, the group common PDCCH can avoid blocking with a CSS to a maximum degree.

[0235] When a position in a logical domain in which a control channel is transmitted is defined, a logical position of the resource reserved for the group common PDCCH may be immediately before or behind the CSS. Alternatively, the resource reserved for the group common PDCCH may be positioned in the last portion of a CORESET or may be positioned to be separated from a start index or end index of the CSS by a predetermined offset. In this case, the deviation may be different for each cell/group. The deviation may be notified to a UE via system information, higher layer signaling or the like.

[0236] Alternatively, the facility for group common PDCCH may be implemented in the CSS. In this case, a group common PDCCH size may be equal to or smaller than the size of a smaller candidate among the control channel candidates in the CSS. In this case, the resource reserved for the group common PDCCH can be included in the CSS candidate, and in this regard, the UE can basically perform blind detection (DB) in the CSS regardless of whether the group common PDCCH is detected in the reserved resource in CSS.

[0237] A resource position reserved for the group common PDCCH may be notified to the UE via system information, higher layer signaling, or the like. When the group common PDCCH is transmitted through a candidate in the CSS, the number of available candidates may be reduced to transmit PDCCH (e.g., common control information, but not a group common PDCCH) in the CSS, which causes a similar result to CSS blocking. Thus, when the group common PDCCH is configured in a CSS, the UE may assume that a candidate, to which the group common PDCCH is mapped, is not used as a CSS candidate of another channel, and may assume that the candidate be an invalid candidate. The UE can ignore the blind detection on the invalid candidate and can proceed to a next candidate. Furthermore, the group common PDCCH can be set to be transmitted using a CSS as a general PDCCH, and in this case, a general blind detection procedure on the CSS can also be performed on the group common PDCCH in the same way.

[0238] FIG. 9 illustrates the reserved allocation of resources for a group common PDCCH in accordance with an embodiment of the present invention. The group common PDCCH can be mapped to a block indicated by dotted lines in FIG. 9.

[0239] (a) of FIG. 9 illustrates the case where a resource reserved for the group common PDCCH is allocated to a first candidate. Consequently, a UE may omit blind detection of a general PDCCH with respect to the corresponding block.

[0240] (b) of FIG. 9 illustrates the case where a resource reserved for the group common PDCCH is allocated to a next portion of the last candidate.

[0241] (c) of FIG. 9 illustrates the case where a resource reserved for the group common PDCCH is allocated to a position with a predetermined deviation from the last candidate.

(2) Group Common PDCCH Transmission via Search Space

[0242] A network can configure a search space in which a group common PDCCH is to be transmitted, and a UE can perform blind detection in a corresponding search space to detect a group common PDCCH.

(i) With G-RNTI

[0243] A search space in which a group common PDCCH is to be transmitted is referred to as a GSS. A Radio Network Temporary Identifier (RNTI) required for detection of the group common PDCCH in the GSS is referred to as a G-RNTI. For example, a group common PDCCH CRC can be scrambled or masked through G-RNTI.

[0244] 1 UE may have one or several G-RNTIs. For example, a UE can be configured with one or multiple GSSs. GSS can be set independently of your number.

The. GSS in CSS

[0245] For example, a network may randomly deploy to a CSS. To deploy GSS in CSS, the GSS candidate size and/or number can be equal to or smaller than the CSS candidate size and/or number. GSS candidates can be deployed contiguously or can be distributed and deployed separately.

[0246] When a size of a GSS candidate is the same as a size of a CSS candidate, a UE needs to additionally perform only the CRS examination on the GSS (e.g., CRC examination through R-RNTI) during the performing blind detection in CSS and thus a problem in terms of additional blind detection overhead due to the additional implementation of GSS can be overcome.

[0247] FIG. 10 illustrates a GSS implemented in a CSS in accordance with an embodiment of the present invention.

[0248] An environment in which the size of a largest candidate among GSS candidates is equal to or less than the size of the smallest candidate in a CSS and the number of GSS candidates is equal to or less than half the number of CSS candidates can be considered.

B. GSS in CORESET

[0249] Similar to a USS, a network can randomly deploy GSSs in a CORESET according to a hashing function using a G-RNTI. Candidates from a GSS can be deployed contiguously or can be distributed and deployed separately.

(ii) Without G-RNTI The. GSS in CSS

[0250] A network may deploy a GSS in a CSS. The present embodiment is partially similar to the above-mentioned method of implementing the GSS in the CSS but, according to the present embodiment, the network can form the GSS and can implement the GSS in the CSS to reduce the possibility of blocking with a control channel to be passed in CSS. The size/number of GSSs can be equal to or less than the size/number of CSS candidates.

[0251] When there is no G-RNTI, the position of a candidate from a GSS needs to be determined. When a GSS candidate size is the same as a CSS candidate size, a UE needs to additionally perform only the CRS examination on the GSS while performing blind detection on the CSS and thus the number of additional blind detections due to additional deployment of GSS may be reduced.

[0252] A position of a GSS candidate to be deployed in each CSS candidate can be defined via system information or higher layer signaling. GSS candidates can be deployed contiguously or can be distributed or deployed separately.

[0253] FIG. 11 illustrates GSS candidates with a fixed position in a CSS in accordance with an embodiment of the present invention.

[0254] When a GSS candidate and a CSS candidate are the same size, a starting index of a CCE, corresponding to an even-numbered candidate or an odd-numbered CSS candidate, can be used as a starting index of a Candidate CCE of GSS.

[0255] When the number of CCEs of the GSS candidate is less than that of the CSS candidate, an index of an even-numbered or odd-numbered CCE into an even-numbered or odd-numbered CSS candidate may be used as a starting index of the GSS candidate's CCE.

B. GSS in CORESET

[0256] When GSSs are configured contiguously without a separate RNTI as an LTE CSS, a starting index of a GSS can be given by applying offset to a starting index or ending index of a CSS.

[0257] The deviation may be different for each cell/group. The deviation may be notified to the UE via system information, higher layer signaling or the like.

[0258] When a group common PDCCH is transmitted to a portion of a CSS (whether a GSS candidate is fixed or not), a UE may assume that the group common PDCCH is transmitted only in a partition in which the CSS is transmitted or minipartition.

[0259] When the group common PDCCH is transmitted to a CSS and a separate resource, a partition and a resource of the partition in which the group common PDCCH is to be transmitted or the mini-partition can be configured separately from the CSS.

[0260] When a downlink control information (DCI) size of the group common PDCCH is different from the DCI transmitted in the CSS, a set of partitions to be monitored for the group common PDCCH by a UE may be different from a CSS monitoring suite. More generally, a UE-monitored partition or mini-partition set may be configured differently for each RNTI, or a UE-monitored partition or mini-partition set may be configured differently for each DCI size.

3. Partition format indication for multiple component carriers

[0261] When a UE uses a plurality of carriers (e.g., carrier aggregation), a network may notify the UE of a partition format to be used on each carrier.

(1) Multiple CC group common PDCCH transmission

[0262] A network may transmit a group common PDCCH to each CC to transmit the partition format indication to each CC. Alternatively, the network can indicate partition formats of all CCs through a primary CC (PCC).

[0263] When the number of CCs used by the UE is high, the network may group the CCs into a plurality of groups and define a PCC for each group. The network can indicate a partition format of CCs into a corresponding group through a PCC of each group.

[0264] A method for grouping CCs is described below.

(i) CCs with the same Partition Format

[0265] A network may group CCs with the same partition format into the same group. In this case, the network can only indicate a partition format for a CC without indicating a partition format for each CC. Consequently, the amount of information required for partition format indication and signaling overhead can be reduced.

(ii) CCs with the same numerology

[0266] A network can group CCs with the same numerology into the same group. In this case, all CCs in a group can have the same partition size. Thus, the network may need to consider a difference in partition indices due to a numerological difference when indicating partition formats with the same time duration.

[0267] When a network transmits partition format information into a plurality of CCs, a payload size of a common group PDCCH can be significantly increased. A maximum group common PDCCH payload size is [1 CC partition format information * the number of CCs], and thus it may be difficult to increase a 1 CC partition format information size. Partition format information in symbol units requires a large amount of information, and thus the partition format indication to be used when a plurality of CCs configured for the UE can be partition type indication or partition type indication. partition.

[0268] A payload size of a common group PDCCH for multiple CCs can be determined if the CCs are grouped. When grouped CCs have the same numerology, there is no problem in the case of the same indicated partition type, but when the respective CCs need to receive indication from different partition types, it may be difficult to support a plurality of CCs in one by one item of partition format indication.

[0269] When a partition format is indicated through a partition type pattern, a problem may arise when periods of partition formats to be indicated by CCs in a group are different. As a case where lengths of partition formats to be received per indication are different for respective CCs, when a UE receives a partition format of a long period, the partition format may be converted into a partition format of a short period . Alternatively, the network may realize the indication of a plurality of partition format periods through a partition format indication item.

[0270] For example, a pattern of a long partition pattern can be defined through a pattern in which a short partition pattern is repeated.

[0271] As another example, a pattern of a short partition period associated with a pattern of a long partition period may be predefined. Even if a UE receives a pattern of a long partition period, the UE may use a pattern of a short partition period combined with the corresponding pattern.

[0272] A more detailed example is described below with reference to FIGS. 12 and 13. FIGS. 12 and 13 illustrate partition patterns of multiple CCs in accordance with an embodiment of the present invention.

[0273] In FIGS. 12 and 13, it is assumed that CCs in a group include a CC that receives indication of 4 partitions as a partition pattern period and a CC that receives indication of 2 partitions as a partition pattern period.

[0274] With reference to FIG. 12, a 4-partition period pattern can be defined in the form that 2-partition period patterns are repeated twice.

[0275] With reference to FIG. 13, 2-partition period patterns associated with 4-partition period patterns can be set.

[0276] When numerologies are different for the respective CCs, but the CCs have the same time duration for the partition pattern indication, a partition pattern period may be determined according to a difference in numerology. For example, a pattern of a short partition pattern can be used for a CC with short SCS, and a pattern of a long partition pattern defined through the pattern of the short partition pattern can be used for a CC for large SCS. This is because, in the case of the same time duration, the number of partitions of a CC with large SCS is greater than the number of partitions of a CC with small SCS.

[0277] FIG. 14 illustrates multiple CC partition patterns in accordance with another embodiment of the present invention. It can be assumed that a 4-partition pattern is a CC pattern using 30 kHz SCS and a 2-partition pattern is a CC pattern using 15 kHz SCS.

[0278] In (a) of FIG. 14, a pattern of a 4-partition period can be defined in the form that the patterns of a 2-partition period are repeated twice.

[0279] In (b) of FIG. 14, a 4-partition one-period pattern and a 2-partition one-period pattern can be associated with each other.

[0280] As such, partition patterns of a plurality of CCs using different numerologies may be indicated through an indication of the shape of a partition.

[0281] When the partition formats of a plurality of carriers are indicated through a group common PDCCH, a period of a partition format of each carrier may be matched based on a carrier on which the group common PDCCH is transmitted . When a period of a partition format of each carrier is smaller than a reference period, a new set of configurations according to repeated patterns/periods can be provided. The case where a period of a particular carrier's partition format is greater than a reference period can be handled in a similar way.

(2) Partition Format Indication Methods

[0282] A CC index based on a network and a CC index based on a UE may be different. Thus, a network may consider a different CC index when indicating a partition format for a CC.

[0283] For example, when a network-based CC is an NCC and a UE-based CC is a UCC, the NCC 1 can be classified into a plurality of UCCs (e.g., UCC 1 to UCC n). . When the network indicates a UCC-based partition format as the UE's reference, the UE can appropriately recognize the indicated information.

[0284] A relationship between the NCC and the UCC may be specifically transmitted to the UE. For example, when the number of CCs configured as the NCC is m and the number of CCs configured as the UCC is n, a relationship between the NCC and the UCC can be defined by a network. The relationship between the NCC and the UCC can be signaled through a MAC CE, system information, or a common group PDCCH.

[0285] Table 8 below shows an example of a relationship between an NCC and a UCC in relation to a UE. [Table 8]

(i) Indication of partition format in terms of Network

[0286] A network may indicate a partition format based on an index of an NCC. After receiving an indication of a partition format based on an index of the NCC, a UE may find an index of a UCC of the UE corresponding to the NCC and may use the indicated partition format as a corresponding partition format of the UE's UCC. HUH.

(ii) Indication of Partition Format in terms of EU

[0287] A network may indicate a partition format based on an index of a UCC. The network can define and indicate a partition format as much as the UCC_max number of UCCs of a UE that has a greater number of UCCs among the UEs belonging to the same group. The UE having UCCs, the number of which is less than UCC_max, can selectively acquire only indication information as much as the number of UCCs of the UE and can determine a partition format for each UCC of the UE.

[0288] When the mapping between the NCC and the UCC is performed in a similar manner with respect to a plurality of UEs, it may be easy to indicate a partition format based on a UCC index.

[0289] FIG. 15 illustrates a flow of a method for transmitting and receiving downlink control information (DCI) in accordance with an embodiment of the present invention. FIG. 15 illustrates an example of the above-mentioned methods and therefore a repeated description of the above description may not be given here.

[0290] Referring to FIG. 15, a base station may transmit information about reference SCS between numerologies of a plurality of subcarrier spacing (SCS) (1505). Information about the reference SCS can be transmitted via higher layer signaling.

[0291] The base station may generate DL control information, including information about a partition format (1510). The base station can transmit DL control information to a UE group including a UE via a UE group common physical downlink control channel (PDCCH). (1515).

[0292] The UE may acquire information about a partition format from the DL control information (1520). The DL control information can indicate a partition format based on the reference SCS. When the SCS of the UE is different from the reference SCS, the UE may convert a partition format of the reference SCS according to the SCS of the UE.

[0293] The time duration of 1 partition may be variable depending on the SCS. The reference SCS can be configured to be equal to or less than the SCS of the UE such that the time duration of 1 partition based on the reference SCS is equal to or greater than the time duration of 1 partition based on the SCS of the EU.

[0294] When the SCS of the UE is M times the reference SCS, the UE may interpret 1 partition based on the reference SCS as M contiguous partitions based on the SCS of the UE.

[0295] The UE may determine, based on information about the partition format, whether each of a plurality of symbols included in the corresponding partition corresponds to downlink (D), uplink (U), or flexible (X). When the SCS of the UE is M times the reference SCS, the UE may interpret a D, U, or X symbol based on the reference SCS as M number of D, U, or X symbols based on the UE SCS.

[0296] Information about a partition format may indicate at least one of the combinations of partition formats configured in the UE.

[0297] A plurality of frequency bands can be configured for the UE and each partition format combination can be obtained by combining a plurality of partition formats for a plurality of frequency bands.

[0298] Each partition format combination can be obtained by combining a partition format for a DL frequency band and a partition format for a UL frequency band. Alternatively, each partition format combination may be obtained by combining a partition format for a new radio access technology (NR) frequency band and a partition format for a long term evolution (LTE) frequency band.

[0299] Partition format combinations configured for a UE may be received via higher layer signaling and may be a subset of a plurality of partition format combinations supported in a wireless communication system. For example, a partition format of a UL band (e.g., UL BWP) and a partition format of a DL band (e.g., DL BWP) may correspond to a partition format combination. Alternatively, a partition format of a BWP in an NR band and a partition format of a BWP (e.g., SUL) in an LTE band may correspond to a partition format combination. The base station may configure at least one partition format combination among a plurality of partition format combinations via RRC signaling to the UE. Then, the base station may indicate at least one of the partition format combinations that is configured by RRC to the UE via DCI transmitted over the group common PDCCH.

[0300] FIG. 16 is a block diagram illustrating a structure of a base station (BS) 105 and a UE 110 in a wireless communication system 100 in accordance with an embodiment of the present invention. The BS 105 can be referred to as an eNB or a gNB. The UE 110 may be referred to as a user terminal.

[0301] Although a BS 105 and a UE 110 are illustrated to simplify the wireless communication system 100, the wireless communication system 100 may include one or more BSs and/or one or more UEs.

[0302] The BS 105 may include a transmit data processor (Tx) 115, a symbol modulator 120, a transmitter 125, a transmit/receive antenna 130, a processor 180, a memory 185, a receiver 190, a symbol demodulator 195 and a receive (Rx) data processor 197. The UE 110 may include a Tx data processor 165, a symbol modulator 170, a transmitter 175, a transmit/receive antenna 135, a processor 155, a memory 160, a receiver 140, a symbol demodulator 155, and an Rx data processor 150. In FIG. 12, although one antenna 130 is used for the BS 105 and one antenna 135 is used for the UE 110, each of the BS 105 and the UE 110 may also include a plurality of antennas as necessary. Therefore, the BS 105 and the UE 110 according to the present invention support a MIMO (Multiple Input Multiple Output) system. The BS 105 according to the present invention can support both a single-user MIMO scheme (SU-MIMO) and a multiple-user MIMO scheme (MU-MIMO).

[0303] On the downlink, the Tx data processor 115 receives traffic data, formats the received traffic data, encodes the formatted traffic data, interleaves the encoded traffic data, and modulates the interleaved data (or performs symbol mapping in the interleaved data), in order to provide modulation symbols (i.e. data symbols). Symbol modulator 120 receives and processes data symbols and pilot symbols to provide a stream of symbols.

[0304] Symbol modulator 120 multiplexes data and pilot symbols, and transmits the multiplexed data and pilot symbols to transmitter 125. In this case, each transmit symbol (Tx) can be a data symbol, a pilot symbol, or a value of a zero signal (null signal). In each symbol period, pilot symbols may be successively transmitted during each symbol period. Pilot symbols can be an FDM symbol, an OFDM symbol, a time division multiplexing (TDM) symbol, or a code division multiplexing (CDM) symbol.

[0305] Transmitter 125 receives a stream of symbols, converts the received symbols into one or more analog signals, and additionally adjusts one or more analog signals (e.g., amplification, filtering, and frequency upconversion of the analog signals), so so that it generates a downlink signal suitable for data transmission over an RF channel. Subsequently, the downlink signal is transmitted to the UE via antenna 130.

[0306] The configuration of the UE 110 will now be described in detail. The antenna 135 of the UE 110 receives a DL signal from the BS 105 and transmits the DL signal to the receiver 140. The receiver 140 performs adjustment (e.g., filtering, amplification, and frequency downconversion) of the received DL signal, and digitizes the adjusted signal to obtain samples. Symbol demodulator 145 demodulates the received pilot symbols and provides the demodulated result to processor 155 to perform channel estimation.

[0307] Symbol demodulator 145 receives a frequency response estimate value for downlink from processor 155, demodulates received data symbols, obtains data symbol estimation values (indicating estimated values of transmitted data symbols ) and provides the data symbol estimation values to the Rx data processor 150. The Rx data processor 150 performs demodulation (i.e., symbol demapping) of data symbol estimation values, deinterleaves the demodulated result, decodes the deinterleaved result and recovers the transmitted traffic data.

[0308] The processing of the symbol demodulator 145 and the Rx data processor 150 is complementary to that of the symbol modulator 120 and the Tx data processor 115 in the BS 205.

[0309] The Tx data processor 165 of the UE 110 processes the uplink traffic data and provides data symbols. Symbol modulator 170 receives and multiplexes data symbols and modulates the multiplexed data symbols such that it can provide a symbol stream to transmitter 175. Transmitter 175 obtains and processes the symbol stream to generate a link signal ascending (UL) and the UL signal is transmitted to the BS 105 via the antenna 135. The transmitter and receiver of the UE/BS can be implemented as a single radio frequency (RF) unit.

[0310] The BS 105 receives the UL signal from the UE 110 through the antenna 130. The receiver processes the received UL signal to obtain samples. Subsequently, symbol demodulator 195 processes the symbols and provides pilot symbols and estimation values of data symbols received via uplink. The Rx data processor 197 processes the data symbol estimation value and retrieves the traffic data received from the UE 110.

[0311] A processor 155 or 180 of the UE 110 or BS 105 commands or indicates operations of the UE 110 or BS 105. For example, the processor 155 or 180 of the UE 110 or BS 105 controls, adjusts and manages operations of the UE 210 or BS 105. Each processor 155 or 180 may be connected to a memory unit 160 or 185 to store program code and data. Memory 160 or 185 is linked to processor 155 or 180 such that it can store the operating system, applications and general files.

[0312] The processor 155 or 180 may also be referred to as a controller, a microcontroller), a microprocessor, a microcomputer, etc. Meanwhile, the processor 155 or 180 may be implemented by various means, e.g., hardware, firmware, software, or a combination thereof. In a hardware configuration, methods in accordance with embodiments of the present invention may be implemented by processor 155 or 180, e.g., one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, etc.

[0313] In a firmware or software configuration, methods in accordance with embodiments of the present invention may be implemented in the form of modules, procedures, functions, etc., that perform the functions or operations described above. The firmware or software implemented in the present invention may be contained in the processor 155 or 180 or in the memory unit 160 or 185 so that it can be driven by the processor 155 or 180.

[0314] Radio interface protocol layers between the UE 110, the BS 105, and a wireless communication system (i.e., network) can be classified into a first layer (L1 layer), a second layer (L2 layer ) and a third layer (L3 layer) based on the three lower layers of the Open System Interconnection (OSI) reference model widely known in communication systems. A physical layer belonging to the first layer (L1) provides an information transfer service through a physical channel. An RRC (Radio Resource Control) layer belonging to the third layer (L3) controls the radio resources between the UE and the network. The UE 110 and the BS 105 can exchange RRC messages with each other via the wireless communication network and the RRC layer.

[0315] The aforementioned embodiments correspond to combinations of elements and characteristics of the present invention in prescribed forms. And it is possible to consider the respective elements or features to be selective unless they are explicitly mentioned. Each of the elements or features can be implemented in a form that cannot be combined with other elements or features. Furthermore, it is possible to implement an embodiment of the present invention by combining elements and/or features together. A sequence of operations explained for each embodiment of the present invention may be modified. Some settings or features of one embodiment may be included in another embodiment or may be replaced by corresponding settings or features of another embodiment. And, apparently, it is understandable that an embodiment is configured by combining claims that cannot have an explicit citation relationship in the claims attached together or that can be included as new claims by amendments after filing the application.

[0316] Although the present invention has been described and illustrated here with reference to its preferred embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention. Thus, the present invention is intended to cover modifications and variations of this invention that are within the scope of the appended claims and their equivalents.

[Industrial Applicability]

[0317] As described above, the present invention can be applied to various wireless communication systems.

Claims (14)

1. Method performed by a user equipment (UE) in a wireless communication system, the method CHARACTERIZED by the fact that it comprises: receiving, from a base station (BS), configuration information regarding a subcarrier spacing (SCS ) reference selected from a plurality of SCSs; and receiving downlink control information (DCI) including partition format information (SFI) to indicate a partition format via a group common physical downlink control channel (PDCCH); wherein the SFI of the DCI indicates the partition format based on the reference SCS, and wherein, based on a first SCS used by the UE being greater than the reference SCS, a plurality of partition formats having the first SCS is determined from the indicated partition format based on the reference SCS. 2. Method, according to claim 1, CHARACTERIZED by the fact that configuration information regarding the reference SCS is received via upper layer signaling. 3. Method according to claim 1, CHARACTERIZED by the fact that the first SCS is M times the reference SCS, wherein the determined plurality of partition formats is applied to M contiguous partitions having the first SCS, and wherein M is a natural number. 4. Method according to claim 3, CHARACTERIZED by the fact that the partition format indicated based on the reference SCS comprises a first plurality of symbols, wherein each of the plurality of partition formats having the first SCS comprises a second plurality of symbols, wherein M contiguous symbols of the first SCS are related to a symbol of the reference SCS. 5. Method, according to claim 1, CHARACTERIZED by the fact that the SFI indicates at least one partition format combination configured in the UE. 6. Method, according to claim 5, CHARACTERIZED by the fact that the UE is configured with a plurality of frequency bands; and wherein each of the at least one partition format combination comprises a plurality of partition formats for the plurality of frequency bands. 7. Method, according to claim 6, CHARACTERIZED by the fact that each of the at least one partition format combination comprises a partition format for a downlink frequency band, and a partition format for a uplink frequency, or wherein each of the at least one partition format combination comprises a partition format for a new radio access technology (NR) frequency band, and a partition format for a frequency band long-term evolution (LTE) technology. 8. Method according to claim 5, CHARACTERIZED by the fact that the at least one partition format combination configured in the UE is obtained through upper layer signaling, and wherein the at least one partition format combination is a subset of a plurality of partition format combinations that are supported in the wireless communication system. 9. Method, according to claim 1, CHARACTERIZED by the fact that the partition format indicated based on the reference SCS is converted into a first partition format having the first SCS. 10. Method, according to claim 1, CHARACTERIZED by the fact that the reference SCS and the first SCS belong to a plurality of SCSs comprising 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz. 11. Method performed by a base station (BS) in a wireless communication system, the method CHARACTERIZED by the fact that it comprises: transmitting, to a user equipment (UE), configuration information regarding a subcarrier spacing (SCS ) reference selected from a plurality of SCSs; transmit, to the UE via a group common physical downlink control channel (PDCCH), downlink control information (DCI) including partition format information (SFI) to indicate a partition format, wherein the SFI of the DCI indicates the partition format based on the reference SCS, and wherein, based on a first SCS used by the UE being greater than the reference SCS, a plurality of partition formats having the first SCS are determined to from the indicated partition format based on the reference SCS. 12. Computer-readable medium CHARACTERIZED by the fact that it stores instructions that, when executed by a processor, cause the processor to execute the method defined in claim 1. 13. User equipment (UE) configured to operate in a wireless communication system, the UE CHARACTERIZED by the fact that it comprises: a receiver; at least one processor; and at least one computer memory operatively coupled to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: receiving, from a base station (BS), configuration information regarding to a reference subcarrier spacing (SCS) selected from a plurality of SCSs; and receiving downlink control information (DCI) including partition format information (SFI) to indicate a partition format via a group common physical downlink control channel (PDCCH), wherein the SFI of the DCI indicates the partition format based on the reference SCS, and wherein, based on a first SCS used by the UE being greater than the reference SCS, a plurality of partition formats having the first SCS are determined from the partition format indicated based on the reference SCS. 14. Base station (BS) configured to operate in a wireless communication system, the BS CHARACTERIZED by the fact that it comprises: a transmitter; at least one processor; and at least one computer memory operatively coupled to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: transmitting, to a user equipment (UE), configuration information relating to a reference subcarrier spacing (SCS) among a plurality of SCSs; transmit, to the UE via a group common physical downlink control channel (PDCCH), downlink control information (DCI) including partition format information (SFI) to indicate a partition format, wherein the SFI of DCI indicates the partition format based on the reference SCS, and wherein, based on a first SCS used by the UE being greater than the reference SCS, a plurality of partition formats having the first SCS are determined from of the indicated partition format based on the reference SCS.