JP7742879B2 - Terminal and wireless communication method - Google Patents

Description

The present disclosure relates to a terminal and a wireless communication method.

Long Term Evolution (LTE) has been specified for Universal Mobile Telecommunication System (UMTS) networks, aiming to achieve even higher data rates and lower latency. Furthermore, successor systems to LTE are also being considered, aiming to achieve even greater bandwidth and speed than LTE. Examples of successor systems to LTE include LTE-Advanced (LTE-A), Future Radio Access (FRA), 5th generation mobile communication system (5G), 5G plus (5G+), Radio Access Technology (New-RAT), and New Radio (NR).

For example, in NR, strengthening the feedback function from terminals to base stations is being considered in order to improve communication quality (e.g., Non-Patent Document 1).

"Enhanced Industrial Internet of Things(IoT) and ultra-reliable and low latency communication",RP-201310,3GPP TSG RAN Meeting #86e,3GPP, July 2020

There is room for consideration when determining the resources used to transmit information fed back from the terminal to the base station.

One aspect of the present disclosure provides a terminal and a wireless communication method capable of determining appropriate resources to be used for transmitting information fed back from the terminal to a base station.

A terminal according to one aspect of the present disclosure includes a receiving unit that receives control information indicating multiple resource sets, a control unit that selects one resource set from the multiple resource sets set based on the control information, and determines resources to be used for transmitting information related to a modulation and coding scheme from the resources of the selected resource set, and a transmitting unit that transmits information related to the modulation and coding scheme using the determined resources.

A wireless communication method according to one aspect of the present disclosure receives control information indicating multiple resource sets, selects one resource set from the multiple resource sets configured based on the control information, determines resources to be used for transmitting information related to a modulation and coding scheme from the resources of the selected resource set, and transmits the information related to the modulation and coding scheme using the determined resources.

FIG. 10 is a diagram showing a first example of a table. FIG. 10 is a diagram illustrating a second example of a table. FIG. 10 is a diagram showing an example of determining a slot in step 1. FIG. 10 is a diagram illustrating an example of determining a PUCCH resource set in step 2. 1 is a diagram illustrating an example of a wireless communication system according to an embodiment. FIG. 2 is a block diagram illustrating an example of a configuration of a base station according to an embodiment. FIG. 2 is a block diagram illustrating an example of a configuration of a terminal according to an embodiment. FIG. 10 is a diagram illustrating an example of RRC parameters for configuring a PUCCH resource set for delta-MCS. FIG. 10 is a diagram illustrating an example of a method for selecting a PUCCH resource set. FIG. 2 is a diagram illustrating an example of a hardware configuration of a base station and a terminal according to an embodiment.

<Knowledge that led to this disclosure>
In 3GPP Rel. 17, technologies related to methods called Ultra-Reliable and Low Latency Communications (URLLC) and Industrial Internet of Things (IIoT) are being considered.

URLLC considers enhancements to terminal feedback for Hybrid Automatic Repeat request - Acknowledgement (HARQ-ACK) and Channel State Information (CSI) feedback for more accurate Modulation and Coding Scheme (MCS) selection. HARQ-ACK is an example of information regarding acknowledgment (e.g., acknowledgement) for data received by a terminal. Physical layer feedback enhancements are being considered for these URLLC considerations.

For example, one example of enhancing the functionality of CSI feedback for more accurate MCS selection is considering having the terminal feed back information about the MCS to the base station. The information fed back from the terminal to the base station is, for example, included in uplink control information (e.g., Uplink Control Information (UCI)). Furthermore, for example, the information about the MCS includes at least one of information indicating a desired MCS, information indicating the difference between the current MCS and the desired MCS, and information indicating an index associated with the desired MCS or the difference between the current MCS and the desired MCS. Three examples are described below.

<Information indicating desired MCS>
For example, the information indicating the desired MCS may include an MCS index. For example, the information indicating the desired MCS may use an MCS index defined in the MCS index table defined in 3GPP TS38.214.

For example, if a terminal fails to decode a Physical Downlink Shared Channel (PDSCH) transmitted with a certain MCS index (referred to as MCS Index #i (i is an integer greater than or equal to 0)), it may set MCS Index #j (j is an integer greater than or equal to 0 and less than i) that is lower than MCS Index #i used in the PDSCH that failed to be decoded as the desired MCS index, and include the desired MCS index #j in the information to be fed back. For example, if a terminal fails to decode a PDSCH transmitted with MCS Index #5, it may send feedback to the base station that includes MCS Index #0, which is lower than MCS index #5.

This configuration increases the flexibility of the MCS that can be requested from the base station.

<Information indicating the difference between the current MCS and the desired MCS>
The information indicating the difference between the current MCS and the desired MCS is determined based on the current MCS and the desired MCS. For example, the current MCS and the desired MCS may be represented by an MCS index defined in the MCS Index table defined in 3GPP TS38.214.

For example, if a terminal fails to decode a PDSCH transmitted with a certain MCS index #i, it may set a desired MCS index #j and include in the feedback information the difference between the MCS index #i used in the PDSCH that failed to be decoded and the desired MCS index #j (e.g., "j-i"). The desired MCS index may be lower than the current MCS index. For example, if a terminal fails to decode a PDSCH transmitted with MCS index #5 and sets the desired MCS index to MCS index #2, it may transmit feedback including "-3" to the base station.

This configuration improves the flexibility of the MCS that can be requested from the base station and reduces the bit size of the information to be fed back.

<Information indicating an index associated with the desired MCS or the difference between the current MCS and the desired MCS>
A table defined for feedback may be introduced. There are two options for the table defined for feedback:

<Option 1>
A table associating a desired MCS with an index may be defined, and the index associated with the desired MCS may be selected from the defined table. The selected index may be included in the information to be fed back. FIG. 1 is a diagram showing a first example of a table. As shown in FIG. 1, the table defined for feedback may be a table that associates specifiable MCS indices with indices that are information to be fed back. The MCS indices specifiable using the table shown in FIG. 1 may be associated with the MCS index table defined in 3GPP TS38.214. For example, the MCS indices specifiable using the table shown in FIG. 1 may be part of the MCS indices specifiable in the MCS index table defined in 3GPP TS38.214.

The terminal may select a desired MCS index from the table shown in Figure 1 and transmit feedback information including an index associated with the selected MCS index to the base station. The bit size of the index associated with the MCS index may be smaller than the bit size of the MCS index.

This configuration allows the feedback bit size to be reduced, thereby reducing the signaling load.

<Option 2>
A table may be defined in which the difference between the current MCS and the desired MCS (hereinafter, referred to as "Delta value") is associated with an index, and an index associated with the Delta value may be selected from the defined table. The selected index may be included in the information to be fed back. FIG. 2 is a diagram showing a second example of a table. As shown in FIG. 2, the table defined for feedback may be a table that associates Delta values with indexes, which are information to be fed back. The Delta value may be associated with an MCS Index table defined in 3GPP TS38.214. For example, in the table shown in FIG. 2, the Delta value may refer to the difference between MCS indices that can be specified in the MCS Index table defined in 3GPP TS38.214.

The terminal sets a desired MCS and determines a Delta value, which is the difference between the current MCS and the desired MCS. The terminal may then select the determined Delta value from the table shown in FIG. 2 and transmit feedback information including an Index associated with the selected Delta value to the base station. The bit size of the Index associated with the Delta value may be smaller than the bit size of the Delta value.

With this configuration, the feedback bit size can be reduced, thereby reducing the signaling load.

In the following, information regarding the above-mentioned MCS will be referred to as "delta-MCS." Note that "delta-MCS" is not limited to the example information described above, and may be information different from the example information described above. For example, "delta-MCS" may be information regarding MCS different from the example information described above. Furthermore, "delta-MCS" may be replaced with other names such as "delta-CQI."

When reporting delta-MCS, one of the following two options is being considered for the resources used for reporting: Option 1: delta-MCS is reported in part of the extended HARQ-ACK codebook. Option 2: delta-MCS is reported in a CSI report that is separate from the HARQ-ACK codebook.

For example, Option 2 considers the type of resource (e.g., PUCCH or higher layer signal) used for reporting delta-MCS. Note that Option 2 does not preclude multiplexing of CSI reports and HARQ-ACK codebooks on the same resource, per multiplexing rule.

In this embodiment, resources used for reporting delta-MCS in the above-mentioned Option 1 are described. Note that in the above-mentioned Option 1, delta-MCS is reported in part of the extended HARQ-ACK codebook, but this disclosure is not limited to delta-MCS and HARQ-ACK being transmitted together. For example, this disclosure may also be applied to cases where delta-MCS and HARQ-ACK are not transmitted together.

<Determining PUCCH Resources for HARQ-ACK>
Next, we will explain how to determine the Physical Uplink Control Channel (PUCCH) resource for the HARQ-ACK codebook in Release 15. The terminal determines the PUCCH resource for transmitting the HARQ-ACK based on the following three steps: Step 1: Determine a slot based on the HARQ-ACK timing K1. Step 2: Determine a set of PUCCH resources for the determined slot. Step 3: Determine (select) a PUCCH resource from the determined resource set.
Each step will be explained below.

In step 1, the slot in which the PUCCH resource is configured is determined based on a parameter called HARQ-ACK timing K1. Here, K1 indicates, for example, the time from the reception of DL data to the transmission of a DL acknowledgement (or negative acknowledgement) corresponding to the received data.

In addition, the K1 instruction is executed in the downlink control information (DCI) as follows:

For a Physical Downlink Shared Channel (PDSCH) scheduled by DCI format 1_0, the set of HARQ-ACK timing K1 is specified by the specification. For example, the set of HARQ-ACK timing K1 includes the values {1, 2, 3, 4, 5, 6, 7, 8}. The three bits of the PDSCH-to-HARQ feedback timing indicator field included in DCI format 1_0 indicate one of the set of HARQ-ACK timing K1.

For PDSCH scheduled by DCI format 1_1, the set of HARQ-ACK timing K1 is configured by the Radio Resource Control (RRC) parameter dl-DataToUL-ACK. Bits 1 to 3 of the PDSCH-to-HARQ feedback timing indicator field included in DCI format 1_1 indicate one of the sets configured by the RRC parameter dl-DataToUL-ACK.

Figure 3 shows an example of determining a slot in step 1. Figure 3 shows four slots, slot n to slot n+3. The example in Figure 3 shows the PDSCH scheduled by DCI format 1_0 (or DCI format 1_1) for slot n and the position of the slot in which the PUCCH resource corresponding to that PDSCH is set. In the example in Figure 3, since K1=1, the terminal determines that the slot in which the PUCCH resource corresponding to the PDSCH for slot n is set is slot n+1.

In step 2, the set of PUCCH resources for the slot determined in step 1 is determined.

The terminal configures one or more PUCCH resource sets, for example, by a signal (e.g., RRC) received from the base station. For example, up to four PUCCH resource sets are configured. The PUCCH resource set is selected from the multiple PUCCH resource sets configured based on the payload size of the UCI. The payload size is expressed, for example, by the number of bits.

The maximum number of UCI information bits N that a terminal transmits using PUCCH resources is provided by the RRC parameter maxPayloadMinus1. Note that maxPayloadMinus1 may also be referred to as maxPayloadSize.

4 is a diagram showing an example of determining a PUCCH resource set in step 2. In FIG. 4, payload sizes (number of UCI bits) are classified into four ranges using _N2 and _N3 , and PUCCH resource sets corresponding to each range are defined. PUCCH resource set 0 includes, for example, 8 to 32 PUCCH resources. The PUCCH resources included in PUCCH resource set 0 are, for example, PUCCH format 0/1. PUCCH resource sets 1 to 3 each include, for example, 8 PUCCH resources. The PUCCH resources included in PUCCH resource sets 1 to 3 are, for example, PUCCH format 2/3/4. For example, _N2 and _N3 and the configuration of each PUCCH resource set may be reported by a signal (e.g., RRC) received from the base station.

The terminal identifies the range that includes the number of UCI information bits to be transmitted using the PUCCH resource, and uses the PUCCH resource set corresponding to the identified range to determine the PUCCH resource.

In step 3, a PUCCH resource is determined from the PUCCH resource set determined in step 2.

For a set containing one or more (e.g., eight) PUCCH resources, the PUCCH resource is indicated by three bits in the PUCCH Resource Indicator (PRI) field of the downlink control information (e.g., DCI) received from the base station. For a set containing more than eight PUCCH resources, the PUCCH resource is determined based on the three-bit PRI field and an implicit manner based on the Control Channel Element (CCE) index.

The three steps described above determine one or more PUCCH resources for the HARQ-ACK codebook.

On the other hand, there is room for consideration regarding how to determine the resources to use for transmitting delta-MCS when delta-MCS is transmitted along with HARQ-ACK.

In the following embodiment, we will explain how to configure resources to be used for transmitting delta-MCS together with HARQ-ACK.

<Example of a wireless communication system>
5 is a diagram illustrating an example of a wireless communication system 10 according to an embodiment. The wireless communication system 10 may be a wireless communication system conforming to New Radio (NR). Illustratively, the wireless communication system 10 may be a wireless communication system conforming to a method called URLLC and/or IIoT. The wireless communication system 10 includes a Next Generation-Radio Access Network 20 (hereinafter, referred to as NG-RAN 20) and a terminal 200.

In addition, the wireless communication system 10 may be a wireless communication system conforming to a system called 5G, Beyond 5G, 5G Evolution, or 6G.

NG-RAN 20 includes base stations 100 (base station 100A and base station 100B). Note that the number of base stations 100 and the number of terminals 200 are not limited to the example shown in Figure 1.

NG-RAN 20 includes multiple NG-RAN nodes, specifically gNBs (or ng-eNBs), and is connected to a 5G-compliant core network (5GC, not shown). Note that NG-RAN 20 and 5GC may also be simply referred to as the "network."

The base station 100 may be referred to as an NG-RAN Node, ng-eNB, eNodeB (eNB), or gNodeB (gNB). The terminal 200 may be referred to as User Equipment (UE). The base station 100 may also be considered as a device included in the network to which the terminal 200 connects.

The base station 100 performs wireless communication with the terminal 200. For example, the wireless communication performed complies with NR. At least one of the base station 100 and the terminal 200 may support Massive MIMO (Multiple-Input Multiple-Output), which generates a more directional beam (BM) by controlling radio signals transmitted from multiple antenna elements. Furthermore, at least one of the base station 100 and the terminal 200 may support Carrier Aggregation (CA), which aggregates and uses multiple component carriers (CC). Furthermore, at least one of the base station 100 and the terminal 200 may support Dual Connectivity (DC), which performs communication between the terminal 200 and each of multiple base stations 100.

The wireless communication system 10 may support multiple frequency bands. For example, the wireless communication system 10 supports Frequency Range (FR) 1 and FR2. The frequency bands of each FR are, for example, as follows:
・FR1: 410MHz to 7.125GHz
・FR2: 24.25GHz to 52.6GHz

FR1 may use a Sub-Carrier Spacing (SCS) of 15 kHz, 30 kHz, or 60 kHz, and a bandwidth (BW) of 5 MHz to 100 MHz. FR2, for example, is a higher frequency than FR1. FR2 may use an SCS of 60 kHz or 120 kHz, and a bandwidth (BW) of 50 MHz to 400 MHz. FR2 may also include an SCS of 240 kHz.

The wireless communication system 10 in this embodiment may support frequency bands higher than the FR2 frequency band. For example, the wireless communication system 10 in this embodiment may support frequency bands exceeding 52.6 GHz up to 114.25 GHz. Such high frequency bands may be referred to as "FR2x."

In addition, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM)/Discrete Fourier Transform - Spread - Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) with a larger Sub-Carrier Spacing (SCS) than the above-mentioned examples may be applied. Furthermore, DFT-S-OFDM may be applied to both the uplink and downlink, or to either one.

In the wireless communication system 10, a slot configuration pattern for time division duplexing (TDD) may be set. For example, the slot configuration pattern may specify a pattern indicating the order of two or more slots among slots for transmitting downlink (DL) signals, slots for transmitting uplink (UL) signals, slots containing a mixture of DL signals, UL signals, and guard symbols, and slots in which the transmitted signal is changed to flexible.

In addition, in the wireless communication system 10, channel estimation of the PUSCH (or PUCCH (Physical Uplink Control Channel)) can be performed using a demodulation reference signal (DMRS) for each slot, but channel estimation of the PUSCH (or PUCCH) can also be performed using DMRSs assigned to multiple slots. Such channel estimation may be called joint channel estimation, or may be called by another name such as cross-slot channel estimation.

The terminal 200 may transmit DMRS allocated to each of the multiple slots in multiple slots so that the base station 100 can perform joint channel estimation using DMRS.

Furthermore, in the wireless communication system 10, enhanced functions may be added to the feedback function from the terminal 200 to the base station 100. For example, an enhanced function of terminal feedback for HARQ-ACK and an enhanced function of CSI feedback for more accurate MCS selection may be added.

Next, the configuration of the base station 100 and terminal 200 will be described. Note that the configuration of the base station 100 and terminal 200 described below is an example of functions related to this embodiment. The base station 100 and terminal 200 may have functions not shown. Furthermore, the functional divisions and/or names of the functional units are not limited as long as the functions perform the operations related to this embodiment.

<Base station configuration>
3 is a block diagram showing an example of the configuration of base station 100 according to this embodiment. Base station 100 includes, for example, a transmitting unit 101, a receiving unit 102, and a control unit 103. Base station 100 communicates with terminal 200 (see FIG. 4) by radio.

The transmitting unit 101 transmits a downlink (DL) signal to the terminal 200. For example, the transmitting unit 101 transmits a DL signal under the control of the control unit 103.

The DL signal may include, for example, a downlink data signal and control information (e.g., Downlink Control Information (DCI)). The DL signal may also include information indicating scheduling related to signal transmission by the terminal 200 (e.g., an UL grant). The DL signal may also include control information of higher layers (e.g., Radio Resource Control (RRC) control information). The DL signal may also include a reference signal.

Channels used to transmit DL signals include, for example, data channels and control channels. For example, the data channel may include a PDSCH (Physical Downlink Shared Channel), and the control channel may include a PDCCH (Physical Downlink Control Channel). For example, the base station 100 transmits control information to the terminal 200 using the PDCCH and transmits downlink data signals using the PDSCH.

Reference signals included in DL signals may include, for example, at least one of the following: Demodulation Reference Signal (DMRS), Phase Tracking Reference Signal (PTRS), Channel State Information-Reference Signal (CSI-RS), Sounding Reference Signal (SRS), and Positioning Reference Signal (PRS) for position information. For example, reference signals such as DMRS and PTRS are used to demodulate downlink data signals and are transmitted using PDSCH.

The receiving unit 102 receives an uplink (UL) signal transmitted from the terminal 200. For example, the receiving unit 102 receives the UL signal under the control of the control unit 103.

The control unit 103 controls the communication operations of the base station 100, including the transmission processing of the transmitting unit 101 and the reception processing of the receiving unit 102.

For example, the control unit 103 acquires information such as data and control information from the upper layer and outputs it to the transmitting unit 101. The control unit 103 also outputs data, control information, etc. received from the receiving unit 102 to the upper layer.

For example, the control unit 103 allocates resources (or channels) to be used for transmitting and receiving DL signals and/or resources to be used for transmitting and receiving UL signals based on signals (e.g., data and control information, etc.) received from the terminal 200 and/or data and control information, etc. obtained from a higher layer. Information regarding the allocated resources may be included in the control information transmitted to the terminal 200.

The control unit 103 may configure multiple PUCCH resource sets as an example of allocating resources to be used for transmitting and receiving UL signals. Information regarding the configured one or more PUCCH resource sets may be notified to the terminal 200 by RRC.

<Device configuration>
4 is a block diagram showing an example of the configuration of terminal 200 according to this embodiment. Terminal 200 includes, for example, receiving unit 201, transmitting unit 202, and control unit 203. Terminal 200 communicates with base station 100, for example, wirelessly.

The receiving unit 201 receives a DL signal transmitted from the base station 100. For example, the receiving unit 201 receives the DL signal under the control of the control unit 203.

The transmitting unit 202 transmits the UL signal to the base station 100. For example, the transmitting unit 202 transmits the UL signal under the control of the control unit 203.

The UL signal may include, for example, an uplink data signal and control information (e.g., UCI). For example, it may include information regarding the processing capabilities of the terminal 200 (e.g., UE capability). The UL signal may also include a reference signal.

Channels used to transmit UL signals include, for example, data channels and control channels. For example, the data channel includes the PUSCH (Physical Uplink Shared Channel), and the control channel includes the PUCCH (Physical Uplink Control Channel). For example, the terminal 200 receives control information from the base station 100 using the PUCCH and transmits uplink data signals using the PUSCH.

Reference signals included in the UL signal may include, for example, at least one of DMRS, PTRS, CSI-RS, SRS, and PRS. For example, reference signals such as DMRS and PTRS are used for demodulating uplink data signals and are transmitted using an uplink channel (e.g., PUSCH).

The control unit 203 controls the communication operations of the terminal 200, including the receiving processing in the receiving unit 201 and the transmitting processing in the transmitting unit 202.

For example, the control unit 203 acquires information such as data and control information from the upper layer and outputs it to the transmitting unit 202. The control unit 203 also outputs, for example, data and control information received from the receiving unit 201 to the upper layer.

For example, the control unit 203 controls the transmission of information to be fed back to the base station 100. The information to be fed back to the base station 100 includes, for example, HARQ-ACK and/or delta-MCS. The information to be fed back to the base station 100 may be included in UCI. The UCI is transmitted in the PUCCH resources.

The control unit 203 configures multiple PUCCH resource sets based on configuration information (e.g., RRC) received from the base station 100, and selects at least one PUCCH resource set from the multiple PUCCH resource sets based on control information (e.g., DCI) received from the base station 100. The control unit 203 then determines, from the resources of the selected PUCCH resource set, a PUCCH resource to be used for transmitting information to be fed back to the base station 100. Under the control of the control unit 203, the transmission unit 202 transmits the information to be fed back to the base station 100 in the PUCCH resource determined by the control unit 203.

Note that the channels used to transmit DL signals and UL signals are not limited to the above examples. For example, the channels used to transmit DL signals and UL signals may include a Random Access Channel (RACH) and a Physical Broadcast Channel (PBCH). The RACH may be used to transmit Downlink Control Information (DCI) including a Random Access Radio Network Temporary Identifier (RA-RNTI), for example.

<About delta-MCS resource settings>
Next, resource configuration for delta-MCS will be described. Regarding resource configuration for delta-MCS, the following three items can be considered: 1. Method for configuring a PUCCH resource set for delta-MCS 2. Method for selecting PUCCH resources depending on the size of information on the combination of HARQ-ACK and delta-MCS 3. Method for determining information on the combination of HARQ-ACK and delta-MCS Each of the items will be described below.

<Method of configuring PUCCH resource set for delta-MCS>
As shown in step 2 of determining PUCCH resources for HARQ-ACK above, one or more PUCCH resource sets are configured when determining PUCCH resources for HARQ-ACK. Multiple PUCCH resource sets may also be configured for delta-MCS. For example, one of the following two configuration methods may be used to configure PUCCH resource sets for delta-MCS in a terminal. Note that multiple PUCCH resource sets may be configured for one delta-MCS, one PUCCH resource may be configured for multiple delta-MCSs, or multiple PUCCH resources may be configured for multiple delta-MCSs.

In configuration method 1, the same PUCCH resource set as the PUCCH resource set for HARQ-ACK shown in step 2 above is set as the PUCCH resource set for delta-MCS. For example, the same four PUCCH resource sets as the four PUCCH resource sets for HARQ-ACK shown in Figure 4 may be set as the PUCCH resource sets for delta-MCS.

In configuration method 1, the PUCCH resource set configured for HARQ-ACK is used for transmitting HARQ-ACK and delta-MCS. In this case, the PUCCH resource set for delta-MCS is configured using configuration information regarding the PUCCH resource set for HARQ-ACK (e.g., PUCCH-ResourceSet in PUCCH-Config).

According to configuration method 1, the PUCCH resource set configuration for HARQ-ACK can be used to configure the PUCCH resource set for delta-MCS, thereby reducing RRC overhead and simplifying the specifications.

In configuration method 2, a PUCCH resource set different from the PUCCH resource set for HARQ-ACK is configured as the PUCCH resource set for delta-MCS. The number of PUCCH resource sets for delta-MCS may be different from the number of PUCCH resource sets for HARQ-ACK. Alternatively, the size of the resources included in each PUCCH resource set for delta-MCS may be different from the size of the resources included in each PUCCH resource set for HARQ-ACK. Alternatively, as illustrated in FIG. 4, the range of the number of UCI information bits associated with each of multiple PUCCH resource sets may be different between the PUCCH resource set for HARQ-ACK and the PUCCH resource set for delta-MCS. Note that the PUCCH resource set for delta-MCS may include one of the PUCCH resource sets for HARQ-ACK, or may include a different PUCCH resource set.

For example, in configuration method 2, the PUCCH resource set for delta-MCS is configured separately from the PUCCH resource set for HARQ-ACK. When delta-MCS is transmitted together with HARQ-ACK, the separately configured PUCCH resource set is used for transmitting HARQ-ACK and delta-MCS. In this case, new RRC parameters are provided for configuring the differentiated PUCCH resource set for delta-MCS.

Figure 8 shows examples of RRC parameters for configuring a PUCCH resource set for delta-MCS. Figure 8 shows two examples of RRC parameters, Alt. 1 and Alt. 2. The RRC parameters shown in Figure 8 are illustratively included in PUCCH-Config.

In Alt.1, in addition to configuration information (e.g., PUCCH-ResourceSet) that sets the PUCCH resource set for HARQ-ACK, deltaMCS-PUCCH-ResourceSet that sets the PUCCH resource set for delta-MCS is included in PUCCH-config. Note that PUCCH-config does not have to include both PUCCH-ResourceSet and deltaMCS-PUCCH-ResourceSet, and may include either one. Also, while Alt.1 in FIG. 8 shows an example in which the information elements in PUCCH-ResourceSet and deltaMCS-PUCCH-ResourceSet are common, the present disclosure is not limited to this. Different information elements may be included in PUCCH-ResourceSet and deltaMCS-PUCCH-ResourceSet. Also, "PUCCH-ResourceSet" and "deltaMCS-PUCCH-ResourceSet" are examples of names, and the present disclosure is not limited to this. At least one of "PUCCH-ResourceSet" and "deltaMCS-PUCCH-ResourceSet" may be replaced with another name.

In Alt.2, a new information element (IE) called "delta-MCS" is included in PUCCH-ResourceSet. The IE called "delta-MCS" indicates, for example, whether the PUCCH resource set configured by PUCCH-ResourceSet is a PUCCH resource set for delta-MCS. Note that the name of the IE called "delta-MCS" in Alt.2 may be replaced with another name. Furthermore, the IE called "delta-MCS" in Alt.2 is not limited to being included in PUCCH-ResourceSet, but may be included in other RRC parameters, or information similar to the information indicated by the IE called "delta-MCS" may be notified to the terminal using a method other than RRC.

According to configuration method 2, a PUCCH resource set can be configured for transmitting HARQ-ACK and delta-MCS, so that an appropriate coding rate can be set for transmitting HARQ-ACK and delta-MCS.

Which of the above-mentioned setting method 1 or setting method 2 is applied may be determined by the specifications, by notified information, or by information indicating the capabilities of the terminal (UE Capability). The information indicating the capabilities of the terminal may be capability information regarding the resources for transmitting delta-MCS.

For example, the configuration method to be applied may be notified by higher layer parameters (e.g., RRC parameters, MAC CE), or information indicating the capabilities of the terminal (UE Capability) may be reported to the base station 110 and the method may be determined based on the terminal's capabilities, or it may be determined in advance according to specifications. Alternatively, it may be determined by a combination of two or more of the above three methods.

For example, when one of setting method 1 and setting method 2 is applied, the application of that one method may be explicitly notified by notifying certain information. When the other of setting method 1 and setting method 2 is applied, the application of the other method may be implicitly notified by not notifying that information.

<Method for selecting a PUCCH resource set depending on the size of information for a combination of HARQ-ACK and delta-MCS>
In the above-mentioned step 2 of determining the PUCCH resource for the HARQ-ACK, a PUCCH resource set to be used for determining the PUCCH resource for the HARQ-ACK is selected from multiple PUCCH resource sets based on the payload size (bit size of the UCI) of the UCI used to transmit the HARQ-ACK. When the HARQ-ACK and delta-MCS are transmitted, the PUCCH resource set may be selected using one of the following two methods:

In selection method 1, a PUCCH resource set is selected based on the bit size of the UCI for HARQ-ACK. In other words, in selection method 1, even if HARQ-ACK and delta-MCS are transmitted, selection (or reselection) is not performed based on the size of the combined information of HARQ-ACK and delta-MCS.

For example, the terminal selects a PUCCH resource set for delta-MCS based on the bit size of the UCI for HARQ-ACK. For example, as described using FIG. 4, the range of payload sizes (number of UCI bits) for HARQ-ACK is classified into ranges equal to the number of PUCCH resource sets (four in FIG. 4), and a PUCCH resource set corresponding to each range is defined. The terminal identifies the range that includes the bit size of the UCI for HARQ-ACK and uses the PUCCH resource set corresponding to the identified range to determine the PUCCH resource. In this case, the size of the information combining the HARQ-ACK and delta-MCS may exceed the maximum payload size that can be transmitted using the PUCCH resource set. If the size of the information combining the HARQ-ACK and delta-MCS exceeds the maximum payload size that can be transmitted using the PUCCH resource set, the delta-MCS may be dropped. Alternatively, in this case, part of the HARQ-ACK may be dropped. Alternatively, in this case, at least part of the HARQ-ACK and at least part of the delta-MCS may be dropped. Here, dropping may correspond to, for example, excluding the HARQ-ACK from the payload of the UCI to be transmitted. When the size of the combined information of the HARQ-ACK and the delta-MCS exceeds the maximum payload size that can be transmitted in the PUCCH resource set, dropping the delta-MCS prevents the HARQ-ACK from being dropped, and therefore the delta-MCS can be transmitted without degrading the quality of the PDSCH acknowledgement.

In selection method 1, the selection operation is common regardless of whether HARQ-ACK or HARQ-ACK and delta-MCS is transmitted, thereby simplifying terminal operation.

In selection method 2, a PUCCH resource set is selected based on the size of the combined information of HARQ-ACK and delta-MCS. The size of the combined information of HARQ-ACK and delta-MCS may be referred to as the combined UCI payload size, for example. The method for obtaining the size of the combined information of HARQ-ACK and delta-MCS will be described later.

For example, the terminal obtains combined information (e.g., UCI). Then, the terminal reselects a PUCCH resource set based on the size of the combined information (e.g., the number of UCI bits). Here, reselection may mean that a PUCCH resource set for HARQ-ACK is selected based on the size of the HARQ-ACK, and then a PUCCH resource for delta-MCS is selected. Note that in this case, a new PUCCH resource set is selected after the PUCCH resource set for HARQ-ACK is selected. For example, there may be cases where a PUCCH resource set is not configured for the size of the combined information (e.g., the number of UCI bits).

For example, as explained using Figure 4, the range of payload size (number of UCI bits) of information combining HARQ-ACK and delta-MCS is classified into ranges equal to the number of PUCCH resource sets (four in Figure 4), and a PUCCH resource set corresponding to each range is specified. The terminal identifies the range that includes the UCI bit size for information combining HARQ-ACK and delta-MCS, and uses the PUCCH resource set corresponding to the identified range to determine the PUCCH resource.

Selection method 2 allows an appropriate PUCCH resource set to be selected depending on the size of the information to be transmitted, thereby improving the reliability of feedback without dropping part of the information.

Here, we will explain the differences between the two selection methods using Figure 9.

Figure 9 shows an example of a method for selecting a PUCCH resource set. Note that in Figure 9, the same configuration as in Figure 4 will not be described again. Figure 9 shows four PUCCH resource sets, as in Figure 4. Figure 9 also shows, by way of example, the number of UCI bits for HARQ-ACK (denoted as "HARQ-ACK UCI bit No." in Figure 9) and the number of UCI bits for the combination of HARQ-ACK and delta-MCS (denoted as "Combined UCI bit No." in Figure 9).

In the example of Figure 9, when selection method 1 is applied, the terminal selects PUCCH resource set 1 corresponding to the number of bits of the UCI of HARQ-ACK. In this case, the size of the information that can be transmitted using the PUCCH resources included in the selected PUCCH resource set may be smaller than the number of bits of the UCI combining HARQ-ACK and delta-MCS. In this case, part of the UCI combining HARQ-ACK and delta-MCS (e.g., delta-MCS) may be dropped.

In the example of Figure 9, when selection method 2 is applied, the terminal selects PUCCH resource set 2 corresponding to the number of UCI bits combining HARQ-ACK and delta-MCS. In this case, PUCCH resource set 2 may not be configured in the terminal. In this case, the terminal may perform another operation that does not use the PUCCH resource set.

Which of the above-mentioned selection methods 1 and 2 is applied may be determined by the specifications, by the information notified, or by information indicating the capabilities of the terminal (UE Capability).

For example, the selection method to be applied may be signaled by higher layer parameters (e.g., RRC parameters, MAC CE), or information indicating the capabilities of the terminal (UE Capability) may be reported to the base station 110 and the selection method may be determined based on the terminal's capabilities, or it may be determined in advance according to specifications. Alternatively, it may be determined by a combination of two or more of the above three methods.

For example, when one of Selection Method 1 and Selection Method 2 is applied, the application of that one may be explicitly notified by notifying certain information. When the other of Selection Method 1 and Selection Method 2 is applied, the application of that other may be implicitly notified by not notifying that information.

Furthermore, the above-mentioned PUCCH resource set configuration method and PUCCH resource set selection method may be associated. For example, PUCCH resource set configuration method 1 may be associated with PUCCH resource set selection method 1, and PUCCH resource set configuration method 2 may be associated with PUCCH resource set selection method 2. In this case, information indicating one of the applied configuration method and applied selection method is explicitly notified, and information indicating the other does not need to be explicitly notified.

Furthermore, the above-mentioned PUCCH resource set configuration method and PUCCH resource set selection method may be determined independently of each other. For example, the PUCCH resource set configuration method may be determined by specifications, and the PUCCH resource set selection method may be determined by notification of parameters from a higher layer.

<Method for determining information on the combination of HARQ-ACK and delta-MCS>
As examples of methods for determining information on the combination of HARQ-ACK and delta-MCS (UCI of the combination), two determination methods are shown below.

In determination method 1, the bits representing delta-MCS information (hereinafter referred to as "delta-MCS bits") are directly added to the bits representing HARQ-ACK information (hereinafter referred to as "HARQ-ACK bits"). For example, if the HARQ-ACK bit size is x bits and the delta-MCS bit size is y bits, the combined UCI bit size is x + y bits.

In decision method 2, the number of delta-MCS bits is limited, and the limited delta-MCS bits are added to the HARQ-ACK bits. For example, information regarding the delta-MCS limit may be set by RRC. For example, if the information regarding the delta-MCS limit indicates a value (e.g., z) that indicates the upper limit of the number of delta-MCS bits, bits representing the delta-MCS information limited to z bits may be added to the bits representing the HARQ-ACK information. In this case, bits exceeding z bits are dropped.

For example, if the bit size of the delta-MCS is y bits and y > z, the bit size of the combined UCI is x + z bits. Also, for example, if y ≦ z, the bit size of the combined UCI is x + y bits.

Which of the above-mentioned determination methods 1 and 2 is applied may be determined by the specifications, by the information notified, or by information indicating the capabilities of the terminal (UE Capability).

For example, the selection method to be applied may be configured by higher layer parameters (e.g., RRC parameters, MAC CE), or may be determined based on the terminal's capabilities as reported to the base station 110 by information indicating the terminal's capabilities (UE Capability), or may be determined in advance by specifications. Alternatively, the selection method may be determined by a combination of two or more of the above three methods.

For example, when one of Determination Method 1 and Determination Method 2 is applied, the application of that one method may be explicitly notified by notifying certain information. When the other of Determination Method 1 and Determination Method 2 is applied, the application of the other method may be implicitly notified by not notifying that information.

Furthermore, at least two of the above-mentioned PUCCH resource set configuration method, PUCCH resource set selection method, and method for determining information on the combination of HARQ-ACK and delta-MCS may be associated with each other. For example, PUCCH resource set configuration method 1, PUCCH resource set selection method 1, and method for determining information on the combination of HARQ-ACK and delta-MCS may be associated with each other. In this case, information indicating the configuration method to be applied is explicitly notified, and information indicating the selection and determination methods to be applied does not need to be explicitly notified.

Furthermore, the methods to be applied for the above-mentioned PUCCH resource set configuration method, PUCCH resource set selection method, and method for determining information on the combination of HARQ-ACK and delta-MCS may be determined independently of each other. Furthermore, the methods to be applied may be determined using different mechanisms. For example, the PUCCH resource set configuration method may be determined by higher layer parameters, the PUCCH resource set selection method may be determined based on UE capability, and the method for determining information on the combination of HARQ-ACK and delta-MCS may be determined by specifications. This determination is merely an example, and the present disclosure is not limited to this.

Furthermore, for example, the method for determining the information on the combination of HARQ-ACK and delta-MCS may be determined depending on whether or not information for limiting the payload size of the added delta-MCS (e.g., a new RRC parameter) is configured. For example, if information for limiting the payload size of delta-MCS (e.g., a new RRC parameter) is configured, the above-mentioned determination method 2, i.e., the method for limiting the payload size of delta-MCS, is applied. On the other hand, if information for limiting the payload size of delta-MCS is not configured, the above-mentioned determination method 1, i.e., the method for directly adding delta-MCS bits and HARQ-ACK bits, is applied. Furthermore, the method for determining the information on the combination of HARQ-ACK and delta-MCS may be determined based on UE capability.

Next, we will explain the additional processing of delta-MCS.

For example, as an example of adding delta-MCS, delta-MCS bits may be added to the beginning or end of the information to be fed back.

For example, when decision method 1 is applied, the first or last y bits of the information to be fed back may be delta-MCS. Also, when decision method 2 is applied and z<y, the first or last z bits of the information to be fed back may be delta-MCS. Also, when decision method 2 is applied and y≦z, the first or last z bits of the information to be fed back may be delta-MCS.

Feedback Resources
The following describes resources used for transmitting feedback information. The feedback resource may be a resource of uplink control information (UCI) different from the feedback. The following options are available for the UCI resource:

The feedback information may be transmitted using HARQ-ACK resources. HARQ-ACK resources are an example of resources used for acknowledgment responses for retransmission control. The following options are possible for HARQ-ACK resources:

First, the feedback information may be transmitted using the HARQ-ACK resource of Type 1 HARQ-ACK CB. The Type 1 HARQ-ACK CB may be a CB that is semi-statically assigned by RRC configuration, etc.

Second, the feedback information may be transmitted using the HARQ-ACK resource of Type 2 HARQ-ACK CB. The Type 2 HARQ-ACK CB may be a CB that is dynamically allocated by DCI, etc.

Third, the feedback information may be transmitted using HARQ-ACK resources for both Type 1 HARQ-ACK CB and Type 2 HARQ-ACK CB. In other words, the feedback information may be transmitted using HARQ-ACK resources regardless of the HARQ-ACK CB Type.

Which HARQ-ACK CB Type HARQ-ACK resource to use as the feedback resource may be determined by the RRC configuration, by the UE capability, or by both the RRC configuration and the UE capability.Which HARQ-ACK CB Type HARQ-ACK resource to use may be determined by the MAC CE message, or may be predetermined by the wireless communication system 10.

The terminal's capability regarding feedback of information related to the MCS described above may be reported by the UE Capability. For example, the UE capability may include information indicating whether the terminal supports configuration of different PUCCH resource sets. The UE Capability may also include information indicating whether the terminal supports selection of a PUCCH resource set based on the bit size of the combined UCI. The UE capability may also include information indicating whether the terminal supports limiting the payload size of the added delta-MCS.

According to the present embodiment described above, the PUCCH resource set is configured and selected taking into account information (e.g., delta-MCS) fed back from the terminal to the base station, so that appropriate resources to be used for transmitting information fed back from the terminal to the base station can be determined.

(Hardware configuration)
The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of hardware and/or software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (e.g., wired, wireless, etc.) and these multiple devices. The functional block may also be realized by combining software with the single device or multiple devices.

Functions include, but are not limited to, judgment, determination, assessment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, regard, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission functions is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

For example, a base station, a terminal, etc. in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 10 is a diagram showing an example of the hardware configuration of a base station and a terminal in one embodiment of the present disclosure. The above-mentioned base station 100 and terminal 200 may be physically configured as a computer device including a processor 1001, memory 1002, storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

In the following description, the term "apparatus" can be interpreted as circuit, device, unit, etc. The hardware configuration of the base station 100 and terminal 200 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

Each function in the base station 100 and the terminal 200 is realized by loading specified software (programs) onto hardware such as the processor 1001 and memory 1002, causing the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of reading and writing data in the memory 1002 and storage 1003.

The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control unit, an arithmetic unit, registers, etc. For example, the above-mentioned control unit 103 and control unit 203 may be realized by the processor 1001.

In addition, the processor 1001 reads programs (program code), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes in accordance with these. The program used is a program that causes a computer to execute at least some of the operations described in the above-mentioned embodiments. For example, the control unit 103 of the base station 100 or the control unit 203 of the terminal 200 may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and similar implementations may be made for other functional blocks. While the above-mentioned various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may also be transmitted from a network via a telecommunications line.

Memory 1002 is a computer-readable recording medium and may be composed of, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. Memory 1002 may also be referred to as a register, cache, main memory (primary storage device), etc. Memory 1002 can store executable programs (program code), software modules, etc. for implementing a wireless communication method relating to one embodiment of the present disclosure.

Storage 1003 is a computer-readable recording medium and may be composed of, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. Storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned storage medium may be, for example, a database, a server, or other suitable medium including at least one of memory 1002 and storage 1003.

The communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, network controller, network card, or communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitter 101, receiver 102, receiver 201, and transmitter 202 may be realized by the communication device 1004.

The input device 1005 is an input device (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, speaker, LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one structure (e.g., a touch panel).

Furthermore, each device such as the processor 1001 and memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

Furthermore, the base station 100 and the terminal 200 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

(Information notification, signaling)
The notification of information is not limited to the aspects/embodiments described in the present disclosure and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB))), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

(Applicable system)
Each aspect/embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), or other suitable systems, and next-generation systems enhanced based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) may also be applied.

(Processing procedures, etc.)
The order of the procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this disclosure may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

(Base station operation)
In the present disclosure, a specific operation described as being performed by a base station may be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal may be performed by at least one of the base station and another network node other than the base station (for example, an MME or an S-GW, etc., but are not limited to these). Although the above example illustrates a case where there is one other network node other than the base station, a combination of multiple other network nodes (for example, an MME and an S-GW) may also be used.

(input/output direction)
Information, etc. (See the "Information, Signals" section) can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It can also be input/output via multiple network nodes.

(Handling of input and output information, etc.)
Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be transmitted to another device.

(Judgment method)
The determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

(software)
Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

Software, instructions, information, etc. may also be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and/or wireless technologies (such as infrared, microwave), these wired and/or wireless technologies are included within the definition of transmission media.

(information, signals)
The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

("System", "Network")
As used in this disclosure, the terms "system" and "network" are used interchangeably.

(parameter, channel name)
Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical formulas, etc. using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

(Base station (wireless base station))
In this disclosure, terms such as "base station (BS),""radio base station,""fixedstation,""NodeB,""eNodeB(eNB),""gNodeB(gNB),""accesspoint,""transmissionpoint,""receptionpoint,""transmission/receptionpoint,""cell,""sector,""cellgroup,""carrier," and "component carrier" may be used interchangeably. A base station may also be referred to by terms such as a macrocell, a small cell, a femtocell, and a picocell.

A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The terms "cell" or "sector" refer to part or all of the coverage area of a base station and/or base station subsystem that provides communication services within this coverage area.

(Terminal)
In this disclosure, the terms "Mobile Station (MS),""userterminal,""User Equipment (UE),""terminal," and the like may be used interchangeably.

A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

(Base station/Mobile station)
At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

Furthermore, the base station in the present disclosure may be read as a user terminal. For example, each aspect/embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be referred to as, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal 200 may be configured to have the functions possessed by the base station 100 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, terms such as uplink channel and downlink channel may be read as side channel.

Similarly, the term "terminal" in this disclosure may be interpreted as "base station." In this case, the base station 100 may be configured to have the functions of the terminal 200 described above.

(Meaning and interpretation of terms)
As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming,""expecting,""considering," etc.

The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and/or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

(reference signal)
The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

(meaning "based on")
As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

("First", "Second")
As used in this disclosure, any reference to an element using a designation such as "first,""second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

(means)
The "unit" in the configuration of each of the above devices may be replaced with "means,""circuit,""device," etc.

(open format)
When the terms "include,""including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

(Time units such as TTI, frequency units such as RB, radio frame configuration) A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

Numerology may be a communication parameter that applies to at least one of the transmission and reception of a signal or channel. Numerology may indicate, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, and specific windowing operations performed by the transceiver in the time domain.

A slot may consist of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol). A slot may also be a time unit based on numerology.

A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

Radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals. Other names may also be used for radio frame, subframe, slot, minislot, and symbol.

For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. In other words, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station schedules each user terminal by allocating radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) in TTI units. Note that the definition of TTI is not limited to this.

A TTI may be a transmission time unit for a channel-coded data packet (transport block), code block, code word, etc., or may be a processing unit for scheduling, link adaptation, etc. Note that when a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, code block, code word, etc. is actually mapped may be shorter than the TTI.

Note that when one slot or one minislot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the smallest time unit for scheduling. Furthermore, the number of slots (minislots) that constitute the smallest time unit for scheduling may be controlled.

A TTI with a time length of 1 ms may be referred to as a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be referred to as a shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, minislot, subslot, slot, etc.

Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than that of a long TTI and greater than or equal to 1 ms.

A resource block (RB) is a resource allocation unit in the time and frequency domains, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

Furthermore, the time domain of an RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI in length. One TTI, one subframe, etc. may each consist of one or more resource blocks.

In addition, one or more RBs may also be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

A resource block may also be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

A Bandwidth Part (BWP) (which may also be referred to as a partial bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

BWPs may include a BWP for the UL (UL BWP) and a BWP for the DL (DL BWP). One or more BWPs may be configured for a UE within one carrier.

At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

The above-described structures of radio frames, subframes, slots, minislots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, as well as the number of symbols in a TTI, symbol length, and cyclic prefix (CP) length can be varied in various ways.

In this disclosure, where articles are added by translation, such as a, an, and the in English, this disclosure may include the noun following these articles being plural.

In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combined" may also be interpreted in the same way as "different."

(Variations of form, etc.)
The aspects/embodiments described in this disclosure may be used alone, in combination, or switched depending on the implementation. Notification of predetermined information (e.g., notification that "X is true") is not limited to explicit notification, but may be implicit (e.g., not notifying the predetermined information).

Although the present disclosure has been described in detail above, it will be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure.

One aspect of the present disclosure is useful in mobile communication systems.

10 Wireless communication system 20 NG-RAN
100 Base station 200 Terminal 101, 202 Transmitter 102, 201 Receiver 103, 203 Controller

Claims (3)

a receiver for receiving control information indicating a plurality of resource sets;
a control unit that selects one resource set from the plurality of resource sets set based on the control information, and determines resources to be used for transmitting information related to a coding and modulation scheme and information related to an acknowledgement for received data from the resources of the selected resource set;
a transmitting unit that transmits transmission information including information about the coding and modulation scheme and information about the acknowledgement, using the determined resource;
The control unit selects the one resource set based on a first size of information related to the acknowledgement;
when a size of information obtained by combining the information on the coding and modulation scheme and the information on the acknowledgement exceeds a size of information that can be transmitted using one resource set, the control unit determines the transmission information obtained by excluding at least one of at least a portion of the information on the coding and modulation scheme and at least a portion of the information on the acknowledgement from the information obtained by combining the information on the coding and modulation scheme and the information on the acknowledgement.
Terminal. the plurality of resource sets are used to transmit information related to the acknowledgement;
The terminal according to claim 1 . receiving control information indicating a plurality of resource sets;
selecting one resource set from the plurality of resource sets set based on the control information based on a first size of information regarding an acknowledgement for the received data;
determining resources to be used for transmitting information about a coding and modulation scheme and information about the acknowledgement from the resources of the selected resource set;
Transmitting transmission information including information about the coding and modulation scheme and information about the acknowledgement using the determined resource;
when the size of the information obtained by combining the information on the coding and modulation scheme and the information on the acknowledgement exceeds the size of the information that can be transmitted using one resource set, determining the transmission information obtained by excluding at least one of at least a portion of the information on the coding and modulation scheme and at least a portion of the information on the acknowledgement from the information obtained by combining the information on the coding and modulation scheme and the information on the acknowledgement;
Wireless communication method.