JP7413403B2 - Terminals, wireless communication methods and systems - Google Patents

Description

The present disclosure relates to a terminal , a wireless communication method , and a system in a next-generation mobile communication system.

In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) has been specified for the purpose of higher data rates, lower delays, etc. (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of further increasing capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

Successor systems to LTE (for example, also referred to as 5th generation mobile communication system (5G), 5G+ (plus), New Radio (NR), 3GPP Rel. 15 or later) are also being considered.

In the existing LTE system (LTE Rel. 8-14), monitoring of radio link quality (Radio Link Monitoring (RLM)) is performed. When a radio link failure (RLF) is detected by the RLM, a user equipment (UE) is requested to re-establish an RRC (Radio Resource Control) connection.

3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010

In future wireless communication systems (for example, NR), a procedure for detecting a beam failure (BF) and switching to another beam (also called a beam failure recovery (BFR) procedure, BFR, etc.) will be implemented. The implementation of the following measures is being considered. Further, in the BFR procedure, when a beam failure occurs, the UE reports a beam failure recovery request (Beam Failure Recovery reQuest: BFRQ) requesting recovery from the beam failure.

In the BFR procedure, it is considered that the UE reports notification of beam failure detection, information about the beam failure cell, and information about the new candidate beam (also referred to as new candidate beam) using one or more steps.

In addition, in NR after Rel-16, priority is set or set for at least one of each UL signal and UL channel (hereinafter also referred to as UL signal/UL channel) based on communication requirements or traffic type. It is being considered to be defined.

Sufficient studies have not been made on how to control priority settings and the like for UL transmission in the BFR procedure. If the BFR procedure is not performed properly, there is a risk of system performance degradation such as BFR delay.

Therefore, an object of the present disclosure is to provide a terminal , a wireless communication method , and a system that can appropriately perform a BFR procedure even when a priority is set for transmission of any one of the BFR procedures. Let's do one.

A terminal according to an aspect of the present disclosure includes a control unit that controls detection of a beam failure, first information that notifies the occurrence of the beam failure, and at least one of a cell that has detected the beam failure and a new candidate beam. and a transmitting unit that transmits the second information based on the priority , the priority of the second information is based on the reception timing of the UL grant that schedules the second information. It is characterized by being determined .

According to one aspect of the present disclosure, even if a priority is set for transmission of any one of the BFR procedures, the BFR procedure can be appropriately performed.

FIG. 1 shows Rel. 15 is a diagram illustrating an example of a BFR procedure in NR. FIG. 2 is a diagram illustrating an example of a BFR procedure when a beam failure is detected. FIG. 3 is a diagram illustrating an example of priority setting according to the first aspect. FIG. 4 is a diagram illustrating another example of priority setting according to the first aspect. FIG. 5 is a diagram illustrating an example of rules for collision between BFR MAC CE (PUSCH) and other UL transmissions. FIG. 6 is a diagram illustrating an example of rules for collision between BFR PUCCH and other UL transmissions. FIG. 7 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 8 is a diagram illustrating an example of the configuration of a base station according to an embodiment. FIG. 9 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. FIG. 10 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment.

<Beam failure recovery>
In NR, communication using beamforming is being considered. For example, a UE and a base station (e.g., gNodeB (gNB)) have beams used for transmitting signals (also referred to as transmit beams, Tx beams, etc.), beams used for receiving signals (also referred to as receive beams, Rx beams, etc.). ) may be used.

When beamforming is used, the quality of the wireless link is expected to deteriorate because it is more susceptible to interference from obstacles. Due to deterioration of radio link quality, radio link failure (RLF) may occur frequently. Since the occurrence of RLF requires cell reconnection, frequent occurrence of RLF causes deterioration of system throughput.

In NR, in order to suppress the occurrence of RLF, when the quality of a specific beam deteriorates, switching to another beam (Beam Recovery (BR), Beam Failure Recovery (BFR), Consideration is being given to implementing an L1/L2 (Layer 1/Layer 2) beam recovery procedure. Note that the BFR procedure may also be simply referred to as BFR.

Note that the beam failure (BF) in the present disclosure may also be referred to as a link failure or a radio link failure (RLF).

FIG. 1 shows Rel. 15 is a diagram illustrating an example of a beam recovery procedure in NR. The number of beams is just an example, and is not limited to this. In the initial state (step S101) in FIG. 1, the UE performs measurements based on reference signal (RS) resources transmitted using two beams.

The RS may be at least one of a synchronization signal block (SSB) and a channel state measurement RS (Channel State Information RS: CSI-RS). Note that the SSB may also be called an SS/PBCH (Physical Broadcast Channel) block or the like.

RS includes a primary synchronization signal (Primary SS: PSS), a secondary synchronization signal (Secondary SS: SSS), a mobility reference signal (Mobility RS: MRS), a signal included in SSB, SSB, CSI-RS, and a demodulation reference signal ( The signal may be at least one of a DeModulation Reference Signal (DMRS), a beam-specific signal, or a signal configured by extending or modifying these. The RS measured in step S101 may be called a beam failure detection RS (BFD-RS) or the like.

In step S102, the UE cannot detect the BFD-RS (or the reception quality of the RS deteriorates) because the radio waves from the base station are interfered with. Such interference may occur, for example, due to the effects of obstacles, fading, interference, etc. between the UE and the base station.

The UE detects a beam failure when a predetermined condition is met. The UE may detect the occurrence of a beam failure, for example, when the block error rate (BLER) for all configured BFD-RSs (BFD-RS resource configurations) is less than a threshold. When the occurrence of a beam failure is detected, the lower layer (physical (PHY) layer) of the UE may notify (instruct) the upper layer (MAC layer) of the beam failure instance.

Note that the criterion for determination is not limited to BLER, but may be reference signal received power (Layer 1 Reference Signal Received Power: L1-RSRP) in the physical layer. Furthermore, instead of or in addition to RS measurement, beam failure detection may be performed based on a physical downlink control channel (PDCCH) or the like. The BFD-RS may be expected to be quasi-co-location (QCL) with the DMRS of the PDCCH monitored by the UE.

Here, QCL is an index indicating statistical properties of a channel. For example, when one signal/channel and another signal/channel have a QCL relationship, the Doppler shift, Doppler spread, and average delay are calculated between these different signals/channels. ), delay spread, and spatial parameter (e.g., Spatial Rx Filter/Parameter, Spatial Tx (transmission) Filter/Parameter). may mean that it can be assumed that they are the same (QCL with respect to at least one of them).

Note that the spatial reception parameters may correspond to the UE's receive beam (eg, receive analog beam), and the beam may be identified based on the spatial QCL. QCL (or at least one element of QCL) in this disclosure may be read as spatial QCL (sQCL).

Information regarding BFD-RS (e.g., RS index, resource, number, number of ports, precoding, etc.), information regarding beam failure detection (BFD) (e.g., the above-mentioned threshold), etc., is communicated to the UE using upper layer signaling etc. may be set (notified). Information regarding BFD-RS may also be referred to as information regarding BFR resources.

In the present disclosure, the upper layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

The MAC signaling may use, for example, a MAC Control Element (CE), a MAC Protocol Data Unit (PDU), or the like. Broadcast information includes, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), and Other System Information. :OSI).

The UE's MAC layer may start a predetermined timer (which may be referred to as a beam failure detection timer) upon receiving a beam failure instance notification from the UE's PHY layer. If the MAC layer of the UE receives beam failure instance notifications a certain number of times (for example, beamFailureInstanceMaxCount configured in RRC) before the timer expires, it triggers BFR (for example, starts one of the random access procedures described below). ) may be done.

If there is no notification from the UE (for example, the time without notification exceeds a predetermined time) or if a predetermined signal (beam recovery request in step S104) is received from the UE, the base station determines that the UE has a beam failure. may be determined to have been detected.

In step S103, the UE starts searching for a new candidate beam for use in communication for beam recovery. The UE may select a new candidate beam corresponding to a given RS by measuring the RS. The RS measured in step S103 may be called a New Candidate Beam Identification RS (NCBI-RS), a CBI-RS, a Candidate Beam RS (CB-RS), or the like. NCBI-RS may be the same as BFD-RS or may be different. Note that the new candidate beam may be called a new candidate beam, a candidate beam, or a new beam.

The UE may determine a beam corresponding to an RS that satisfies a predetermined condition as a new candidate beam. The UE may, for example, determine a new candidate beam based on the RS whose L1-RSRP exceeds a threshold among the configured NCBI-RSs. Note that the criteria for judgment is not limited to L1-RSRP. The determination may be made using at least one of L1-RSRP, L1-RSRQ, and L1-SINR (signal-to-noise-interference power ratio). L1-RSRP for SSB may be referred to as SS-RSRP. L1-RSRP for CSI-RS may be referred to as CSI-RSRP. Similarly, L1-RSRQ for SSB may be referred to as SS-RSRQ. L1-RSRQ regarding CSI-RS may be referred to as CSI-RSRQ. Similarly, the L1-SINR regarding SSB may be called SS-SINR. The L1-SINR for CSI-RS may be referred to as CSI-SINR.

Information regarding the NCBI-RS (e.g., RS resources, number, number of ports, precoding, etc.), information regarding the new candidate beam identification (NCBI) (e.g., the above-mentioned threshold), etc., is sent to the UE using upper layer signaling, etc. It may be set (notified). Information regarding NCBI-RS may be obtained based on information regarding BFD-RS. Information regarding NCBI-RS may also be referred to as information regarding NCBI resources.

Note that BFD-RS, NCBI-RS, etc. may be replaced with Radio Link Monitoring Reference Signal (RLM-RS).

In step S104, the UE that has identified the new candidate beam transmits a beam failure recovery request (BFRQ). The beam recovery request may also be called a beam recovery request signal, a beam failure recovery request signal, or the like.

BFRQ may be transmitted using a random access channel (Physical Random Access Channel: PRACH), for example. The BFRQ may include information on the new candidate beam identified in step S103. Resources for BFRQ may be associated with the new candidate beam. Beam information includes a beam index (BI), a port index of a predetermined reference signal, a resource index (for example, a CSI-RS resource indicator (CSI-RS resource indicator: CRI), an SSB resource indicator (SSBRI)), etc. The notification may be made using

Rel. 15 NR uses CB-BFR (Contention-Based BFR), which is BFR based on a contention-based random access (RA) procedure, and CF-BFR (Contention-Free BFR), which is BFR based on non-collision-based random access procedure. is supported. In CB-BFR and CF-BFR, the UE may transmit a preamble (also referred to as RA preamble, Physical Random Access Channel (PRACH), RACH preamble, etc.) as BFRQ using PRACH resources.

In step S105, the base station that has detected the BFRQ transmits a response signal (which may be called a BFR response, gNB response, etc.) in response to the BFRQ from the UE. The response signal may include reconfiguration information for one or more beams (eg, DL-RS resource configuration information).

The response signal may be transmitted, for example, in the UE common search space of the PDCCH. The response signal is notified using a PDCCH (DCI) with a cyclic redundancy check (CRC) scrambled by the UE identifier (for example, Cell-Radio RNTI (C-RNTI)). may be done. The UE may determine at least one of a transmit beam and a receive beam to use based on the beam reconfiguration information.

The UE may monitor the response signal based on at least one of a control resource set for BFR (CONtrol REsource SET: CORESET) and a search space set for BFR. For example, the UE may detect a DCI with a CRC scrambled with a C-RNTI in a BFR search space within an individually configured CORESET.

Regarding CB-BFR, contention resolution may be determined to be successful if the UE receives a PDCCH corresponding to its own C-RNTI.

Regarding the process in step S105, a period may be set for the UE to monitor a response from a base station (for example, gNB) to BFRQ. The period may be called, for example, a gNB response window, gNB window, beam recovery request response window, BFRQ response window, etc. The UE may retransmit the BFRQ if no gNB response is detected within the window period.

In step S106, the UE may transmit a message to the base station indicating that beam reconfiguration has been completed. The message may be transmitted, for example, by PUCCH or PUSCH.

In step S106, the UE may receive RRC signaling indicating the setting of the Transmission Configuration Indication state (TCI state) used for the PDCCH, or may receive a MAC CE indicating the activation of the setting.

Beam recovery success (BR success) may represent, for example, the case where step S106 is reached. On the other hand, beam recovery failure (BR failure) may correspond to, for example, BFRQ transmission reaching a predetermined number of times or beam failure recovery timer (Beam-failure-recovery-Timer) expiring.

Note that these step numbers are merely numbers for explanation, and a plurality of steps may be grouped together or the order may be changed. Further, whether or not to implement BFR may be set in the UE using upper layer signaling.

By the way, in future wireless communication systems (for example, Rel. 16 and later), when a beam failure is detected, the uplink control channel (PUCCH) and MAC control information (MAC CE) will be used to notify the occurrence of the beam failure, Reporting information regarding the cell (or CC) in which a failure has been detected and information regarding a new candidate beam is being considered.

For example, after detecting a beam failure, the UE may utilize one or more steps (e.g., two steps) to notify the occurrence of the beam failure, report information about the cell that detected the beam failure, and report information about the new candidate beam. It is conceivable to do this (see Figure 2). Note that the reporting operation is not limited to two steps.

In the uplink control channel, resources can be set more flexibly in the time domain than in the PRACH. Therefore, it is effective to use the uplink control channel (PUCCH) as a channel used for BFRQ transmission. Furthermore, MAC CE (PUSCH) allows resources to be set more flexibly in the time domain compared to PRACH. Therefore, it is effective to use MAC CE (PUSCH) as a channel used for BFRQ transmission.

In FIG. 2, in a first step (or step 1), the UE uses an uplink control channel (PUCCH) to notify the occurrence of a beam failure. In addition, in the second step (or step 2), the UE uses the MAC control information (for example, MAC CE or MAC PDU including MAC CE) to obtain information regarding the cell in which the beam failure has been detected and regarding the new candidate beam. It is envisaged that at least one of the following information will be reported.

In the following description, the information transmitted in the first step is also referred to as first information, and the information transmitted in the second step is also referred to as second information. Further, the UL transmission transmitted in the first step is also referred to as the first UL transmission, and the UL transmission transmitted in the second step is also referred to as the second UL transmission.

For the PUCCH in the first step, a method similar to that for transmitting a scheduling request (SR) may be used. For example, in the BFR procedure, the UE may transmit first information notifying the occurrence of a beam failure using the SR. The SR used to notify the occurrence of a beam failure may be called a BFR SR, a BFR SR for SCell, a dedicated SR for SCell, or a dedicated SR.

The MAC CE (or MAC PDU) in the second step may be transmitted using uplink resources. For example, the UE may transmit the MAC CE using uplink resources allocated by the base station through PUCCH (for example, dedicated SR-like PUCCH) transmission in the first step.

Uplink resources are resources (UL-SCH resources) for logical uplink channels (for example, Uplink Shared Channel (UL-SCH)) or resources for physical uplink channels (for example, Physical Uplink Shared Channel (UL-SCH)). )) resources, etc.

The format of the PUCCH used in the first step may be, for example, PUCCH format (PF) 0 or 1. Moreover, PUCCH transmission in the first step may be performed in a predetermined cell (for example, PCell or PSCell). PF0 may be composed of 1 or 2 symbols. On the other hand, PF1 may be composed of four or more symbols.

The PUCCH resource for BFR of the SCell in the first step may be configured commonly for all SCells included in a predetermined group (for example, the same cell group). In addition, if the UE detects a beam failure and receives a UL grant in a cell that can transmit BFR MAC CE before PUCCH (or SR) transmission in the first step, the UE PUCCH transmission may not be performed.

Even when a beam failure is detected, if the UE cannot identify a new candidate beam, the UE must include information on the cell that detected the beam failure and the index of the new candidate beam in the MAC CE in the second step. Good too. The case where a new candidate beam cannot be identified may be, for example, a case where there is no reference signal whose received power (RSRP) is equal to or higher than a predetermined value.

<Priority settings>
Rel. In NR 16 and later, it is being considered to set multiple levels (for example, two levels) of priority for a predetermined signal or channel. For example, communication is controlled by setting separate priorities for each signal or channel that corresponds to different traffic types (also called services, service types, communication types, use cases, etc.) (for example, transmission control in case of collision, etc.) It is assumed that this will be done. This makes it possible to control communication by setting different priorities for the same signal or channel depending on the service type and the like.

The priority may be set for a signal (for example, a UCI such as HARQ-ACK, a reference signal, etc.), a channel (PDSCH, PUSCH, etc.), a HARQ-ACK codebook, or the like. The priority may be defined as a first priority (for example, High) and a second priority (for example, Low) that is lower in priority than the first priority. Alternatively, three or more types of priorities may be set. Information regarding the priority may be notified from the base station to the UE using at least one of upper layer signaling and DCI.

For example, a priority may be set for UCI (eg, at least one of scheduling request, CSI, and HARQ-ACK). Priorities may be set for HARQ-ACK codebooks corresponding to these HARQ-ACKs. Alternatively, priority may be set for PUSCH used for transmitting a predetermined MAC CE. Note that when a priority is set for the PUSCH, the priority of information or signals (for example, MAC CE, CSI, etc.) transmitted by the PUSCH may be replaced with the priority of the PUSCH.

The UE may control UL transmission based on priority when different UL signals/UL channels collide. For example, control may be performed such that UL transmission with a high priority is performed and UL transmission with a low priority is not performed (eg, dropped). Alternatively, the transmission timing of low priority UL transmissions may be changed (eg, postponed or shifted).

Different UL signals/UL channels collide when the time resources (or time resources and frequency resources) of different UL signals/UL channels overlap, or when the transmission timings of different UL signals/UL channels overlap. It may be.

In this way, when priority is set for UL transmission, priority may also be set for UL transmission in the BFR procedure (for example, the first information in step 1, the second information in step 2, etc.). is assumed.

However, sufficient studies have not progressed on how to control priority settings or transmission based on priorities for UL transmission in the BFR procedure. If the BFR procedure is not performed properly, there is a risk of system performance degradation such as BFR delay.

The inventors of the present invention have considered setting the priority of UL transmission in the BFR procedure or controlling transmission based on the priority, and have conceived one aspect of the present invention.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Each of the following aspects may be applied alone or in combination.

Further, in the following explanation, the first priority (High) and the second priority (Low) will be used as examples of priorities, but the number and type of priorities are not limited to this. Three types (or three levels) or more of priorities may be applied. Furthermore, the priority set for each signal or channel may be set in the UE by upper layer signaling or the like.

(First aspect)
In the first aspect, a method for setting the priority of second information used for notification of at least one of a cell in which a beam failure has been detected and a new candidate beam will be described. Note that the priority of the second information can be read as the priority of the MAC CE (for example, subsequent MAC CE) that includes the second information, or the priority of the PUSCH used for transmitting the second information. Good too.

If the transmission of the first information and the second information from the UE is supported after detecting a beam failure, the priority of the second information is set to the same priority as the priority of the first information. (Option 1-1) (see Figure 3). Note that the priority of the first information is the priority of the BFR PUCCH resource (for example, PUCCH-BFR resource) used for transmitting the first information, the priority of the BFR PUCCH, or the priority of the BFR SR. It may be read as degree.

Alternatively, the priority of the second information may be set separately from the priority of the first information (see FIG. 4). In this case, the priority of the second information may be a fixed value (or fixedly set) regardless of the priority of the first information (option 1-2). Alternatively, the priority of the second information may be set based on predetermined information or predetermined conditions (option 1-3). Alternatively, the priority of the first information and the priority of the second information may be set separately based on at least one of upper layer signaling and downlink control information (option 1-4).

<Option 1-1>
The UE may determine that the priority of the second information is the same as the priority of the first information and control the transmission of the second information (see FIG. 3). For example, when the first information (for example, PUCCH resource for BFR) corresponding to the second control information is set to the first priority (high), the UE also sets the second information to the first priority. may be assumed to be set to .

Alternatively, if the first information corresponding to the second control information is set to a second priority (low), the UE assumes that the second information is also set to a second priority. Good too.

The priority of the first information may be notified or set from the network to the UE by upper layer signaling or the like. The priority of the first information (PUCCH resource for BFR) may be the same as the priority set for the resource for scheduling request (or PUCCH resource for SR), or may be different from the PUCCH resource for SR. may be set to .

By setting the priority of the second information to be the same as the priority of the first information, if the priority of the first information is high, the priority of the second information can also be made high. It is possible to align the priorities of UL transmissions in response to the occurrence of UL transmissions. Further, since the UE can determine the second priority based on the first priority, it is not necessary to notify the UE of the second priority, and the determination at the UE can be simplified.

<Option 1-2>
Regardless of the priority of the first information, the priority of the second information may be fixedly set or defined. Note that the priority of the second information may always be set to a fixed value (or a fixed value), or may be set to a fixed value when a predetermined condition is met. The predetermined condition may be a case where the priority of the second information is not notified or set to the UE by upper layer signaling or the like.

For example, the priority of the second information may always be the first priority (high). The UE determines whether the priority of the second information is set to the first priority (high) or the second priority (low). It may be assumed that it is a priority. Further, the UE may determine that the priority of the second information is the first priority when not receiving information regarding the priority of the second information through upper layer signaling. By setting the priority of the second information high, the BFR procedure can be performed with priority.

Alternatively, the priority of the second information may always be the second priority (low). Regardless of whether the priority of the first information is set to the first priority (high) or the second priority (low), the UE determines whether the priority of the second information is set to the second priority. It may be assumed that it is a priority. Further, the UE may determine that the priority of the second information is the second priority when not receiving information regarding the priority of the second information through upper layer signaling. By setting the priority of the second information low, communication in the primary cell (PCell) can be given priority over the BFR procedure in the secondary cell (SCell).

<Option 1-3>
The priority of the second information may be set based on predetermined information or predetermined conditions. The predetermined information may be, for example, content notified by the UE as second information.

For example, the UE may determine the priority of the second information based on whether the second information includes information specifying a new candidate beam (option 1-3A). Alternatively, the UE may determine the priority of the second information based on the reception timing of the UL grant (or the timing at which the UL grant is sent) that schedules the second information (e.g., BFR MAC CE). Good (Option 1-3B). Alternatively, the UE may determine the priority of the second information based on the number of beam-faulted cells included in the second information (option 1-3C).

<Option 1-3A>
The priority of the second information may be determined based on whether the second information includes information specifying a new candidate beam. The information specifying the new candidate beam may be information indicating the index of the new candidate beam, or information indicating the reference signal index whose received power (for example, RSRP) is equal to or greater than a predetermined value. The received power (for example, RSRP) may be set from the base station to the UE by upper layer signaling or the like.

For example, when the second information includes information specifying a new candidate beam, the UE may determine that the priority of the second information is the first priority (high). On the other hand, if the second information does not include information specifying a new candidate beam (for example, if a reference signal with RSRP equal to or higher than a predetermined value cannot be detected), the UE determines that the priority of the second information is It may be determined that the priority level is 2 (low).

In this way, by setting the priority of the second information in the BFR procedure to be high when there is a new beam to switch to, the BFR procedure can be performed with priority, thereby suppressing the delay in the beam switching operation. be able to. As a result, even if a beam failure occurs, deterioration in communication quality can be suppressed.

Note that the setting of the priority of the second information is not limited to this, and the second priority is set when information specifying a new candidate beam is included, and when information specifying a new candidate beam is not included. may be set to the first priority.

<Option 1-3B>
The priority of the second information may be determined based on the timing of receiving a UL grant for scheduling the second information (for example, BFR MAC CE).

For example, the UE may receive a UL grant in a cell that can transmit second information (for example, MAC CE for BFR) without transmitting first information (for example, PUCCH for BFR or SR-like BFR). There may also be cases where it is received. In such a case, the UE may transmit the second information without transmitting the first information. At this time, the UE may determine that the priority of the second information is the first priority (for example, high). In other words, if the UE receives a UL grant that schedules a PUSCH that allows transmission of the second information before transmitting the first information, the priority of the second information is higher than the first priority. It may be determined that there is.

On the other hand, in other cases, the UE may determine that the priority of the second information is a second priority (low), or may determine that the priority of the second information is low based on other information or conditions. Priority may be determined. The other case may be, for example, a case where the second information is scheduled by a UL grant transmitted from the base station based on the transmission of the first information. The other information or conditions may be, for example, the conditions of option 1-3A.

In this way, when it is possible to transmit the second information using a PUSCH scheduled with a UL grant other than the UL grant transmitted according to the first information, the priority of the second information is set. By increasing the height, it becomes possible to preferentially transmit the second information that is not based on the transmission of the first information.

<Option 1-3C>
The priority of the second information may be determined based on information regarding the cell (for example, SCell) in which a beam failure has been detected, which is included in the second information. The information regarding cells in which beam failure has been detected may be information indicating the number of cells in which beam failure has been detected.

For example, when the number of beam failure detection cells included in the second information is equal to or greater than a predetermined value, the UE may determine that the priority of the second information is the first priority (high). The predetermined value may be 2, for example. That is, the UE may set the priority of the second information to be high when beam failures of multiple cells are detected simultaneously. Of course, the predetermined value is not limited to this.

On the other hand, in other cases, the UE may determine that the priority of the second information is a second priority (low), or may determine that the priority of the second information is low based on other information or conditions. Priority may be determined. The other case may be, for example, a case where the number of beam failure detection cells included in the second information is less than a predetermined value. The other information or conditions may be, for example, the conditions of option 1-3A.

In this way, by setting the priority of the second information to be high when a large number of cells have detected a beam failure, beam switching operations can be performed preferentially for a plurality of cells. Thereby, communication quality can be improved.

<Option 1-4>
The priority of the second information may be set from the network (eg, base station). For example, the UE may be set or notified of the priority of the second information based on at least one of upper layer signaling and downlink control information.

The priority of the second information and the priority of the first information may be set separately (for example, using different upper layer parameters). This makes it possible to flexibly control the priority of the first information and the priority of the second information.

(Second aspect)
In a second aspect, a UE operation will be described when the second information (for example, subsequent MAC CE) transmitted from the UE when a beam failure is detected collides with another UL transmission. In the following description, collision of UL transmissions within the same cell group (for example, MCG, SCG, or PUCCH cell group) will be described as an example, but the invention is not limited thereto. Note that UL transmission may be read as UL signal or UL channel.

If the second information and another UL transmission collide, the UE determines the signal or channel to transmit based on the priority of the second information and the priority of the other UL transmission or the type of the other UL transmission. You may decide. Below, the case where the priority of the second information is higher than the priority of other UL transmissions (Case 2-1) and the case where the priority of the second information is lower than the priority of other UL transmissions (Case 2-1) 2) shows an example of UE operation when the priority of the second information is the same as the priority of other UL transmissions (case 2-3).

<Case 2-1>
The second information and other UL transmissions collide, and the priority of the second information (e.g., first priority (high)) is higher than the priority of the other UL transmission (e.g., second priority (low)). )) is high, the UE may not transmit another UL transmission (eg, drop) and transmit the second information.

At this time, if the other UL transmission is a predetermined UL signal or UL channel, the UE gives priority to the transmission of the predetermined UL signal or UL channel, and does not transmit the second information or postpones the transmission timing. It may be controlled to do so. The predetermined UL signal or UL channel may be at least one of a random access channel (eg, PRACH) transmission and a PUSCH transmission scheduled with a UL grant (eg, RAR UL grant) with a random access response.

In this way, by prioritizing the transmission of a predetermined UL signal or UL channel regardless of the priority of the second information, an operation that is prioritized over the BFR procedure of the SCell (for example, a predetermined operation in the PCell or PSCell) can be prioritized. You can do it by doing this. Note that a configuration may be adopted in which no priority is set for a predetermined UL signal or UL channel.

Alternatively, the UE may autonomously determine which transmission of the predetermined UL signal or UL channel or the second information should be prioritized. Alternatively, it may be determined which transmission to prioritize depending on the content of the second information (for example, the presence or absence of a new candidate beam, the number of beam failure detection cells, etc.).

<Case 2-2>
The second information and other UL transmissions collide and the second information has a higher priority (e.g., second priority (lower)) than the other UL transmission's priority (e.g., first priority (high)). )) is low, the UE may not transmit (eg, drop) the second information and may control to perform other UL transmissions.

<Case 2-3>
If the second information and another UL transmission collide and the priority of the other UL transmission is the same as the priority of the second information, the UE may decide which signal or channel to transmit based on predetermined rules. Good (see Figure 5).

For example, if the other UL transmission is HARQ-ACK, the UE may multiplex or include HARQ-ACK in the BFR MAC CE (or BFR PUSCH) used to transmit the second information. good. In this case, both the second information and HARQ-ACK can be sent. Note that the UE may decide whether to multiplex HARQ-ACKs based on the size (eg, number of bits) of HARQ-ACKs.

Alternatively, if the other UL transmission is a scheduling request (e.g., an SR requesting a UL grant), the UE does not transmit (e.g., drops) the scheduling request and controls to transmit the second information. You may. By prioritizing the BFR procedure, it is possible to suppress reduction in beam recovery delay and improve communication quality.

Note that the UE may multiplex the scheduling request and the second information onto the BFR MAC CE (or BFR PUSCH) used for transmitting the second information.

Alternatively, if the other UL transmission is another PUSCH used other than BFR, the UE may control to transmit the second information without transmitting the other PUSCH (e.g. drop). good. Other PUSCHs may be, for example, PUSCHs that include aperiodic CSI or do not include aperiodic CSI. Alternatively, the other PUSCH may be a PUSCH including semi-persistent CSI.

By prioritizing PUSCH related to BFR, it is possible to suppress reduction in beam recovery delay and improve communication quality.

Alternatively, if the other UL transmission is an aperiodic SRS, the UE may control the transmission of the second information without transmitting (for example, dropping) the aperiodic SRS.

Note that the UE may multiplex the aperiodic SRS and the second information onto the BFR MAC CE (or BFR PUSCH) used for transmitting the second information.

In addition, if the other UL transmission is a predetermined UL signal or UL channel, the UE may prioritize the transmission of the predetermined UL signal or UL channel and do not transmit the second information or change the transmission timing. may be controlled to postpone.

(Third aspect)
In a third aspect, a UE operation will be described when the first information (for example, BFR PUCCH) transmitted from the UE when a beam failure is detected collides with other UL transmission.

The UE may receive information (for example, upper layer signaling, SR resource configuration information (SchedulingRequestResourceConfig) in PUCCH configuration information (PUCCH-Config)) indicating the priority of PUCCH-BFR (first UL transmission). The UE may receive information (eg, higher layer signaling) indicating the priority of other UL transmissions.

When PUCCH-BFR (SR resource for PUCCH-BFR) and other UL transmissions overlap in time, the UE controls PUCCH-BFR and other UL transmissions based on the priority of each UL transmission. Good too.

In this disclosure, PUCCH-BFR, SR for PUCCH-BFR, SR resource for PUCCH-BFR, SR used for PUCCH-BFR, SR for BFR, PUCCH for BFR, beam failure recovery request (Beam Failure Recovery reQuest: BFRQ), may be read interchangeably.

In the present disclosure, the UL grant request SR, normal SR, and existing system (Rel. 15) SR may be interchanged.

If the PUCCH resources for BFR and other UL transmission resources overlap in time within one cell group, the UE transmits the PUCCH resources for BFR and other UL transmission resources according to at least one of the following operations 1 to 3. The transmission may also be controlled. The cell group may be a master cell group (MCG) or a secondary cell group (SCG) or a PUCCH cell group.

[Operation 1]
When the PUCCH resource for BFR is configured with the first priority (high or high priority), the UE uses Physical Random Access Channel (PRACH) transmission and PUSCH scheduled by Random Access Response (RAR) UL grant. , and other UL transmissions configured with a second priority (low or low priority) may be dropped.

[Operation 2]
If the other UL transmission is at least one of a PRACH transmission and a PUSCH scheduled by the RAR UL grant, it depends on the UE implementation whether to prioritize the PUCCH for BFR or the other UL transmission. Alternatively, priority may always be given to at least one of PRACH transmission and PUSCH scheduled by the RAR UL grant, or priority may always be given to PUCCH for BFR.

If the BFR PUCCH resource is set to low priority and other UL transmissions satisfy the priority conditions, the UE may drop the BFR PUCCH. The priority condition is that the other UL transmission is set to high priority and that the other UL transmission is at least one of the PRACH transmission and the PUSCH scheduled by the RAR UL grant. It may be at least one of the following.

[Operation 3]
When the priority of the BFR PUCCH resource is set to the same priority as other UL transmissions, the UE may control the BFR PUCCH and other UL transmissions, for example, according to the rules shown in FIG. 6.

If the SR for BFR using PF0 or PF1 collides with the HARQ-ACK using PF0, the UE may transmit the HARQ-ACK and SR for BFR on the PUCCH resource of PF0 for HARQ-ACK (multiple ).

If the SR for BFR using PF0 collides with the HARQ-ACK using PF1, the UE may transmit HARQ-ACK on the PUCCH resource of PF1 for HARQ-ACK and drop the SR for BFR, The SR for BFR may be transmitted on the PUCCH resource of PF0 for BFR, and the HARQ-ACK may be dropped.

If the SR for BFR using PF1 collides with the HARQ-ACK using PF1, the UE may transmit the HARQ-ACK on the PUCCH resource of PF1 for the SR for BFR.

If the SR for BFR using PF0 or PF1 collides with the HARQ-ACK using PF2 or PF3 or PF4, the UE may transmit the HARQ-ACK and the SR for BFR on the PUCCH resource for HARQ-ACK ( may be multiplexed). Here, the PUCCH resource set may be determined by the UCI payload size, and the PUCCH resource for HARQ-ACK may be determined by the PUCCH resource indicator field in the latest DCI. This may be the same as PUCCH resource determination for HARQ-ACK after RRC connection setup.

If K SR occasions of the SR for BFR collide, ceil(log ₂ (K+1)) bits may be sent. This may mean that only one SR for BFR is allowed. The UE may select an SR with high priority. If more than one SR has high priority, which SR is selected may depend on the UE implementation.

If the SR for BFR using PF0 or PF1 collides with the SR for UL grant request using PF0 or PF1, the UE transmits one positive SR (SR for BFR or SR for UL grant request) and determines which SR It may be up to the UE to decide whether to send the SR, or the UE may send the SR for BFR and drop the SR for UL grant request, or may send the SR for UL grant request and drop the SR for BFR. It's okay.

If the SR for BFR using PF0 or PF1 collides with PUSCH having UL-SCH with A-CSI reporting or PUSCH having UL-SCH without A-CSI reporting, the UE shall transmit PUSCH. , the SR for BFR may be dropped, the UE may transmit the SR for BFR and drop the PUSCH, or which one to transmit may depend on the implementation of each UE, or if If the PUSCH includes a MAC CE for BFR, the UE may transmit the PUSCH and drop the SR for BFR; otherwise, the UE may transmit the SR for BFR and drop the PUSCH.

If the SR for BFR using PF0 or PF1 collides with the PUSCH with A-CSI report or SP-CSI report, the UE shall send the SR for BFR and drop the A-CSI report or SP-CSI report or PUSCH. You may.

If the SR for BFR using PF0 or PF1 collides with the aperiodic (A)-Sounding Reference Signal (SRS), the UE may transmit the SR for BFR and drop the A-SRS.

According to this aspect, even if the BFR SR and other UL transmissions overlap in time, the UE can appropriately control the BFR SR and other UL transmissions.

(Fourth aspect)
The UE may receive information (eg, higher layer signaling) indicating the priority of UL transmission (first UL transmission) in the first cell group. The UE may receive information (eg, higher layer signaling) indicating the priority of UL transmission (first UL transmission) in the second cell group. The UE may control the first UL transmission and the second UL transmission based on the priority of each UL transmission if the first and second UL transmissions overlap in time.

The UE may determine power allocation for UL transmissions in multiple cell groups according to any of the following power allocation methods 1-3. Each of the plurality of cell groups may be an MCG, an SCG, or a PUCCH cell group.

[Power distribution method 1]
The UE may prioritize the power of UL transmission within a cell group (MCG or first PUCCH cell group) including the PCell, regardless of the priority of UL transmission.

[Power distribution method 2]
First, the UE may prioritize power for UL transmissions that are configured or indicated as high priority. Second, if both UCI and PUSCH transmissions have high priority, the UE may prioritize the power of the UCI transmissions. Third, if the UL transmission with high priority spans two or more cell groups, the power of the UL transmission of the cell group with PCell may be prioritized.

[Power distribution method 3]
First, the UE may prioritize power for UL transmissions that are configured or indicated as high priority. Second, if UL transmissions with high priority span more than one cell group, the power of UL transmissions of cell groups with PCells may be prioritized. Third, if both UCI and PUSCH transmissions have high priority, the UE may prioritize the power of the UCI transmissions.

The UE is in power-limited, and according to one of power allocation methods 1 to 3, the power of the UL transmission of the first cell group has priority over the power of the UL transmission of the second cell group. If so, the UE may scale the power of the UL transmissions of the second cell group such that the UE's total transmit power does not exceed the maximum allowed transmit power across all cell groups. Note that adjusting power means reducing the power of some UL transmissions so that the total transmit power does not exceed (or is equal to) the maximum transmit power (or maximum allowable transmit power). It's okay.

A power limited state is a state in which the maximum permissible transmission power has been reached in at least one of the serving cell, Timing Advance Group (TAG), cell group, or the UE at the timing when the UE attempts to transmit. It may be. For example, a power limited state is when the UE attempts to transmit multiple UL transmissions (channels or signals) in the same symbol and the UE's total transmit power reaches the maximum transmit power (or maximum allowed transmit power). (if it exceeds). For example, the power limited state may be that the transmit power of the UL transmission is limited as a result of a request to transmit the UL transmission that exceeds the maximum allowable transmit power of the UE. In other words, in a power-limited state, the sum of the transmission power required for uplink signals to the master base station (Master Cell Group: MCG) and UL transmission to the secondary base station (Secondary Cell Group: SCG) is The maximum transmit power allowed by the UE may be exceeded. Here, the required transmission power (also referred to as desired power, desired transmission power, etc.) is the required power (required transmission power) notified from the base station, and power-ramping is performed based on the requested power. Including the applied and increased transmit power.

When the UE is in a power limited state, it may be read as a case where the UE has detected (determined) a power limited state. The total transmit power may be the sum of the transmit power of all cell groups, all serving cells (CCs), or used for the UE across all serving cells in a frequency range (FR1, FR2, etc.) that spans all cell groups. It may be the total transmission power.

Allowable maximum transmission power, power limit value, maximum total transmission power, P-Max, p-UE, p-UE-FR1, p-UE-FR2, frequency range spanning all cell groups (FR1, It may also be read as the maximum total transmission power used by the UE across all serving cells within the UE (FR2, etc.). The UE may be configured with a maximum allowable transmit power by higher layer signaling. Power adjustment (scale) may be read as scale down, power scaling, etc.

According to this aspect, even if multiple UL transmissions in different cell groups overlap in time, the transmission power of the multiple UL transmissions can be appropriately allocated.

(wireless communication system)
The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above-described embodiments of the present disclosure or a combination thereof.

FIG. 7 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by the Third Generation Partnership Project (3GPP). .

Furthermore, the wireless communication system 1 may support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC has dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), and dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)).

In EN-DC, an LTE (E-UTRA) base station (eNB) is a master node (Master Node (MN)), and an NR base station (gNB) is a secondary node (Secondary Node (SN)). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

The wireless communication system 1 has dual connectivity between multiple base stations within the same RAT (for example, NR-NR Dual Connectivity (NN-DC) where both the MN and SN are NR base stations (gNB)). )) may be supported.

The wireless communication system 1 includes a base station 11 that forms a macro cell C1 with relatively wide coverage, and base stations 12 (12a-12c) that are located within the macro cell C1 and form a small cell C2 that is narrower than the macro cell C1. You may prepare. User terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, they will be collectively referred to as base station 10.

The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). Macro cell C1 may be included in FR1, and small cell C2 may be included in FR2. For example, FR1 may be a frequency band below 6 GHz (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and FR1 may correspond to a higher frequency band than FR2, for example.

Further, the user terminal 20 may communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

The plurality of base stations 10 may be connected by wire (for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is an upper-level station, is an Integrated Access Backhaul (IAB) donor, and base station 12, which is a relay station, is an IAB donor. May also be called a node.

Base station 10 may be connected to core network 30 via other base stations 10 or directly. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

The user terminal 20 may be a terminal compatible with at least one of communication systems such as LTE, LTE-A, and 5G.

In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access method may be used. For example, in at least one of the downlink (DL) and uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

A wireless access scheme may be referred to as a waveform. Note that in the wireless communication system 1, other wireless access methods (for example, other single carrier transmission methods, other multicarrier transmission methods) may be used as the UL and DL wireless access methods.

In the wireless communication system 1, downlink channels include a physical downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (physical broadcast channel (PBCH)), and a downlink control channel (physical downlink control channel). Channel (PDCCH)) or the like may be used.

In the wireless communication system 1, uplink channels include an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), and a random access channel. (Physical Random Access Channel (PRACH)) or the like may be used.

User data, upper layer control information, System Information Block (SIB), etc. are transmitted through the PDSCH. User data, upper layer control information, etc. may be transmitted by PUSCH. Furthermore, a Master Information Block (MIB) may be transmitted via the PBCH.

Lower layer control information may be transmitted by PDCCH. The lower layer control information may include, for example, downlink control information (DCI) that includes scheduling information for at least one of PDSCH and PUSCH.

Note that the DCI that schedules PDSCH may be called DL assignment, DL DCI, etc., and the DCI that schedules PUSCH may be called UL grant, UL DCI, etc. Note that PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

A control resource set (CORESET) and a search space may be used to detect the PDCCH. CORESET corresponds to a resource for searching DCI. The search space corresponds to a search area and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", etc. in the present disclosure may be read interchangeably.

PUCCH allows channel state information (CSI), delivery confirmation information (for example, may be called Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, etc.), and scheduling request ( Uplink Control Information (UCI) including at least one of SR)) may be transmitted. A random access preamble for establishing a connection with a cell may be transmitted by PRACH.

Note that in the present disclosure, downlinks, uplinks, etc. may be expressed without adding "link". Furthermore, various channels may be expressed without adding "Physical" at the beginning.

In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), and the like may be transmitted. In the wireless communication system 1, the DL-RS includes a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), and a demodulation reference signal (DeModulation). Reference Signal (DMRS)), Positioning Reference Signal (PRS), Phase Tracking Reference Signal (PTRS), etc. may be transmitted.

The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS/PBCH block, SS Block (SSB), etc. Note that SS, SSB, etc. may also be called reference signals.

In addition, in the wireless communication system 1, measurement reference signals (Sounding Reference Signal (SRS)), demodulation reference signals (DMRS), etc. are transmitted as uplink reference signals (UL-RS). good. Note that DMRS may be called a user terminal-specific reference signal (UE-specific reference signal).

(base station)
FIG. 8 is a diagram illustrating an example of the configuration of a base station according to an embodiment. The base station 10 includes a control section 110, a transmitting/receiving section 120, a transmitting/receiving antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140 may be provided.

Note that this example mainly shows functional blocks that are characteristic of the present embodiment, and it may be assumed that base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 110 controls the base station 10 as a whole. The control unit 110 can be configured from a controller, a control circuit, etc., which will be explained based on common recognition in the technical field related to the present disclosure.

The control unit 110 may control signal generation, scheduling (eg, resource allocation, mapping), and the like. The control unit 110 may control transmission and reception, measurement, etc. using the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140. The control unit 110 may generate data, control information, a sequence, etc. to be transmitted as a signal, and may transfer the generated data to the transmitting/receiving unit 120. The control unit 110 may perform communication channel call processing (setting, release, etc.), status management of the base station 10, radio resource management, and the like.

The transmitting/receiving section 120 may include a baseband section 121, a radio frequency (RF) section 122, and a measuring section 123. The baseband section 121 may include a transmission processing section 1211 and a reception processing section 1212. The transmitting/receiving unit 120 includes a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting/receiving circuit, etc., which are explained based on common understanding in the technical field related to the present disclosure. be able to.

The transmitter/receiver 120 may be configured as an integrated transmitter/receiver, or may be configured from a transmitter and a receiver. The transmitting section may include a transmitting processing section 1211 and an RF section 122. The reception section may include a reception processing section 1212, an RF section 122, and a measurement section 123.

The transmitting/receiving antenna 130 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.

The transmitter/receiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitter/receiver 120 may receive the above-mentioned uplink channel, uplink reference signal, and the like.

The transmitting/receiving unit 120 may form at least one of a transmitting beam and a receiving beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

The transmitting/receiving unit 120 (transmission processing unit 1211) performs Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, on the data, control information, etc. acquired from the control unit 110). RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. may be performed to generate a bit string to be transmitted.

The transmitting/receiving unit 120 (transmission processing unit 1211) performs channel encoding (which may include error correction encoding), modulation, mapping, filter processing, and discrete Fourier transform (DFT) on the bit string to be transmitted. A baseband signal may be output after performing transmission processing such as processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion.

The transmitting/receiving unit 120 (RF unit 122) may perform modulation, filter processing, amplification, etc. on the baseband signal in a radio frequency band, and may transmit the signal in the radio frequency band via the transmitting/receiving antenna 130. .

On the other hand, the transmitting/receiving section 120 (RF section 122) may perform amplification, filter processing, demodulation into a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 130.

The transmitting/receiving unit 120 (reception processing unit 1212) performs analog-to-digital conversion, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) on the acquired baseband signal. )) processing (if necessary), applying reception processing such as filter processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing and PDCP layer processing, User data etc. may also be acquired.

The transmitting/receiving unit 120 (measuring unit 123) may perform measurements regarding the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, etc. based on the received signal. The measurement unit 123 measures reception power (for example, Reference Signal Received Power (RSRP)), reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)). , signal strength (for example, Received Signal Strength Indicator (RSSI)), propagation path information (for example, CSI), etc. may be measured. The measurement results may be output to the control unit 110.

The transmission path interface 140 transmits and receives signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and transmits and receives user data (user plane data) for the user terminal 20, control plane It is also possible to acquire and transmit data.

Note that the transmitting unit and receiving unit of the base station 10 in the present disclosure may be configured by at least one of the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140.

The transmitter/receiver 120 transmits first information notifying the occurrence of a beam failure and second information regarding at least one of the cell in which the beam failure has been detected and the new candidate beam, which are transmitted based on the priority. At least one may be received. The priority of the first information (or the first UL transmission) and the priority of the second information (or the second UL transmission) may be the same or may be set separately.

The control unit 110 may control the setting of at least one of the priority of the first information (or the first UL transmission) and the priority of the second information (or the second UL transmission).

(user terminal)
FIG. 9 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control section 210, a transmitting/receiving section 220, and a transmitting/receiving antenna 230. Note that one or more of each of the control unit 210, the transmitting/receiving unit 220, and the transmitting/receiving antenna 230 may be provided.

Note that this example mainly shows functional blocks that are characteristic of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 210 controls the entire user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which will be explained based on common recognition in the technical field related to the present disclosure.

The control unit 210 may control signal generation, mapping, and the like. The control unit 210 may control transmission and reception using the transmitting/receiving unit 220 and the transmitting/receiving antenna 230, measurement, and the like. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as a signal, and may transfer the generated data to the transmitting/receiving unit 220.

The transmitting/receiving section 220 may include a baseband section 221, an RF section 222, and a measuring section 223. The baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212. The transmitting/receiving unit 220 can be configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field related to the present disclosure.

The transmitting/receiving section 220 may be configured as an integrated transmitting/receiving section, or may be configured from a transmitting section and a receiving section. The transmitting section may include a transmitting processing section 2211 and an RF section 222. The reception section may include a reception processing section 2212, an RF section 222, and a measurement section 223.

The transmitting/receiving antenna 230 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.

The transmitter/receiver 220 may receive the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transmitter/receiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, and the like.

The transmitting/receiving unit 220 may form at least one of a transmitting beam and a receiving beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

The transmission/reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (e.g. RLC retransmission control), MAC layer processing (e.g. , HARQ retransmission control), etc., to generate a bit string to be transmitted.

The transmitting/receiving unit 220 (transmission processing unit 2211) performs channel encoding (which may include error correction encoding), modulation, mapping, filter processing, DFT processing (as necessary), and IFFT processing on the bit string to be transmitted. , precoding, digital-to-analog conversion, etc., and output a baseband signal.

Note that whether or not to apply DFT processing may be based on the settings of transform precoding. When transform precoding is enabled for a certain channel (for example, PUSCH), the transmitting/receiving unit 220 (transmission processing unit 2211) performs the above processing in order to transmit the channel using the DFT-s-OFDM waveform. DFT processing may be performed as the transmission processing, or if not, DFT processing may not be performed as the transmission processing.

The transmitting/receiving unit 220 (RF unit 222) may perform modulation, filter processing, amplification, etc. on the baseband signal in a radio frequency band, and may transmit the signal in the radio frequency band via the transmitting/receiving antenna 230. .

On the other hand, the transmitting/receiving section 220 (RF section 222) may perform amplification, filter processing, demodulation into a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 230.

The transmission/reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, and decoding (error correction) on the acquired baseband signal. (which may include decoding), MAC layer processing, RLC layer processing, and PDCP layer processing may be applied to obtain user data and the like.

The transmitting/receiving section 220 (measuring section 223) may perform measurements regarding the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal. The measurement unit 223 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like. The measurement results may be output to the control unit 210.

Note that the transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting/receiving unit 220 and the transmitting/receiving antenna 230.

The transmitting/receiving unit 220 prioritizes at least one of first information notifying the occurrence of a beam failure and second information regarding at least one of the cell in which the beam failure has been detected and the new candidate beam. It may also be sent based on the

For example, the priority of the first information (or the first UL transmission) and the priority of the second information (or the second UL transmission) may be the same.

Alternatively, the priority of the first information (or the first UL transmission) and the priority of the second information (or the second UL transmission) may be set separately. For example, the priority of the second information may be a fixed value. Alternatively, the priority of the second information may be determined based on at least one of the content of the second information and the timing of receiving a UL grant that schedules the second information.

The control unit 210 may control beam failure detection. In addition, when the second information and other UL transmission collide within the same cell group, the control unit 210 controls the priority of the second information and the priority of the other UL transmission, or the type of the other UL transmission. Based on this, control may be performed to transmit at least one of the second information and other UL transmission.

(Hardware configuration)
It should be noted that the block diagram used to explain the above embodiment shows blocks in functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or may be realized using two or more physically or logically separated devices directly or indirectly (e.g. , wired, wireless, etc.) and may be realized using a plurality of these devices. The functional block may be realized by combining software with the one device or the plurality of devices.

Here, functions include judgment, decision, judgement, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and consideration. , broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. Not limited. For example, a functional block (configuration unit) that performs transmission may be called a transmitting unit, a transmitter, or the like. In either case, as described above, the implementation method is not particularly limited.

For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. FIG. 10 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc. .

Note that in the present disclosure, words such as apparatus, circuit, device, section, unit, etc. can be read interchangeably. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured not to include some of the devices.

For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processing may be performed by one processor, or the processing may be performed by two or more processors simultaneously, sequentially, or using other techniques. Note that the processor 1001 may be implemented using one or more chips.

Each function in the base station 10 and the user terminal 20 is performed by, for example, loading predetermined software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations and communicates via the communication device 1004. This is achieved by controlling at least one of reading and writing data in the memory 1002 and storage 1003.

The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU) that includes interfaces with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, at least a portion of the above-mentioned control unit 110 (210), transmitting/receiving unit 120 (220), etc. may be realized by the processor 1001.

Furthermore, the processor 1001 reads programs (program codes), software modules, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes in accordance with these. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated in the processor 1001, and other functional blocks may also be realized in the same way.

Memory 1002 is a computer-readable storage medium, such as at least Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. It may be composed of one. Memory 1002 may be called a register, cache, main memory, or the like. The memory 1002 can store executable programs (program codes), software modules, and the like to implement a wireless communication method according to an embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM), etc.), a digital versatile disk, removable disk, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium. It may be configured by Storage 1003 may also be called an auxiliary storage device.

The communication device 1004 is hardware (transmission/reception 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, a network controller, a network card, a communication module, or the like. The communication device 1004 includes, for example, 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). It may be configured to include. For example, the above-described transmitting/receiving unit 120 (220), transmitting/receiving antenna 130 (230), etc. may be realized by the communication device 1004. The transmitter/receiver 120 (220) may be physically or logically separated into a transmitter 120a (220a) and a receiver 120b (220b).

The input device 1005 is an input device (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Further, each device such as the processor 1001 and the 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 for each device.

The base station 10 and the user terminal 20 also include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc. It may be configured to include hardware, and a part or all of each functional block may be realized using the hardware. For example, processor 1001 may be implemented using at least one of these hardwares.

(Modified example)
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, channel, symbol and signal may be interchanged. Also, the signal may be a message. The reference signal may also be abbreviated as RS, and may be called a pilot, pilot signal, etc. depending on the applicable standard. Further, a component carrier (CC) may be called a cell, a frequency carrier, a carrier frequency, or the like.

A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.

Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology includes, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, and radio frame configuration. , a specific filtering process performed by the transceiver in the frequency domain, a specific windowing process performed by the transceiver in the time domain, etc.

A slot may be constituted by one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. Further, a slot may be a time unit based on numerology.

A slot may include multiple minislots. Each minislot may be made up of one or more symbols in the time domain. Furthermore, a mini-slot may also be called a sub-slot. A minislot may be made up of fewer symbols than a slot. PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (PUSCH) mapping type A. PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (PUSCH) mapping type B.

Radio frames, subframes, slots, minislots, and symbols all represent time units for transmitting signals. Other names may be used for the radio frame, subframe, slot, minislot, and symbol. Note that time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be read interchangeably.

For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, and one slot or minislot may be called a TTI. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. It may be. 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 minimum time unit for scheduling in wireless communication. For example, in the LTE system, a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each user terminal) to each user terminal on a TTI basis. Note that the definition of TTI is not limited to this.

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

Note that when one slot or one minislot is called a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum time unit for scheduling. Further, the number of slots (minislot number) that constitutes the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI that is shorter than a normal TTI may be referred to as an abbreviated TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, or the like.

Note that long TTI (for example, normal TTI, subframe, etc.) may be read as TTI with a time length exceeding 1 ms, and short TTI (for example, short TTI, etc.) It may also be read as a TTI having the above TTI length.

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

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

Note that one or more RBs include a physical resource block (Physical RB (PRB)), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, and an RB. They may also be called pairs.

Further, a resource block may be configured by one or more resource elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

Bandwidth Part (BWP) (also called partial bandwidth, etc.) refers to a subset of contiguous common resource blocks (RBs) for a certain numerology in a certain carrier. Good too. Here, the common RB may be specified by an RB index based on a common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

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

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 of the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

Note that the structures of the radio frame, subframe, slot, minislot, symbol, etc. described above 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 symbols included in an RB, The number of subcarriers, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

In addition, the information, parameters, etc. described in this disclosure may be expressed using absolute values, relative values from a predetermined value, or using other corresponding information. may be expressed. For example, radio resources may be indicated by a predetermined index.

The names used for parameters and the like in this disclosure are not limiting in any respect. Furthermore, the mathematical formulas etc. using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable designation, the various names assigned to these various channels and information elements are not in any way exclusive designations. .

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., which may be referred to throughout the above description, may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may also be represented by a combination of

Further, information, signals, etc. may be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layer. Information, signals, etc. may be input and output via multiple network nodes.

Input/output information, signals, etc. may be stored in a specific location (eg, memory) or may be managed using a management table. Information, signals, etc. that are input and output can be overwritten, updated, or added. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.

Notification of information is not limited to the aspects/embodiments described in this disclosure, and may be performed using other methods. For example, the information notification in this disclosure may be performed using physical layer signaling (e.g., Downlink Control Information (DCI), uplink control information (UCI)), upper layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof. It may be carried out by

Note that the physical layer signaling may be called Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), etc. Further, RRC signaling may be called an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like. Further, MAC signaling may be notified using, for example, a MAC Control Element (CE).

Further, notification of prescribed information (for example, notification of "X") is not limited to explicit notification, but may be made implicitly (for example, by not notifying the prescribed information or by providing other information) (by notification).

The determination may be made by a value expressed by 1 bit (0 or 1), or by a boolean value expressed by true or false. , may be performed by numerical comparison (for example, comparison with a predetermined value).

Software includes instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name. , should be broadly construed to mean an application, software application, software package, routine, subroutine, object, executable, thread of execution, procedure, function, etc.

Additionally, software, instructions, information, etc. may be sent and received via a transmission medium. For example, if the software uses wired technology (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (such as infrared, microwave) to , a server, or other remote source, these wired and/or wireless technologies are included within the definition of a transmission medium.

As used in this disclosure, the terms "system" and "network" may be used interchangeably. "Network" may refer to devices (eg, base stations) included in the network.

In this disclosure, "precoding", "precoder", "weight (precoding weight)", "quasi-co-location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", Terms such as "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" are interchangeable. can be used.

In this disclosure, "Base Station (BS)", "Wireless base station", "Fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "Access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission/Reception Point (TRP)", "Panel" , "cell," "sector," "cell group," "carrier," "component carrier," and the like may be used interchangeably. A base station is sometimes referred to by terms such as macrocell, small cell, femtocell, and picocell.

A base station can accommodate one or more (eg, three) cells. If a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is divided into base station subsystems (e.g., small indoor base stations (Remote Radio Communication services can also be provided by the Head (RRH)). The term "cell" or "sector" refers to part or all of the coverage area of a base station and/or base station subsystem that provides communication services in this coverage.

In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" are used interchangeably. can be done.

A mobile station is 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.

At least one of a base station and a mobile station may be called a transmitting device, a receiving device, a wireless communication device, or the like. Note that at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, or the like. The moving object may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving object (for example, a drone, a self-driving car, etc.), or a robot (manned or unmanned). ). Note that at least one of the base station and the mobile station includes 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 Internet of Things (IoT) device such as a sensor.

Furthermore, the base station in the present disclosure may be replaced by a user terminal. For example, communication between a base station and a user terminal is replaced with communication between multiple user terminals (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). Regarding the configuration, each aspect/embodiment of the present disclosure may be applied. In this case, the user terminal 20 may have the functions that the base station 10 described above has. Further, words such as "upstream" and "downstream" may be replaced with words corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may be replaced with side channels.

Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions that the user terminal 20 described above has.

In this disclosure, the operations performed by the base station may be performed by its upper node in some cases. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (e.g. It is clear that this can be done by a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc. (but not limited to these) or a combination thereof.

Each aspect/embodiment described in this disclosure may be used alone, may be used in combination, or may be switched and used in accordance with execution. Further, the order of the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this disclosure may be changed as long as there is no contradiction. For example, the methods described in this disclosure use an example order to present elements of the various steps and are not limited to the particular order presented.

Each aspect/embodiment described in this disclosure is applicable to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system ( 4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802. 20, Ultra-WideBand (UWB), Bluetooth (registered trademark), and other appropriate wireless communication methods, and next-generation systems expanded based on these may be applied. Furthermore, a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G) may be applied.

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

As used in this disclosure, any reference to elements using the designations "first," "second," etc. does not generally limit the amount or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, reference to a first and second element does not imply that only two elements may be employed or that the first element must precede the second element in any way.

As used in this disclosure, the term "determining" may encompass a wide variety of actions. For example, "judgment" can mean judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry ( For example, searching in a table, database, or other data structure), ascertaining, etc. may be considered to be "determining."

In addition, "judgment (decision)" includes receiving (e.g., receiving information), transmitting (e.g., sending information), input (input), output (output), access ( may be considered to be "determining", such as accessing data in memory (eg, accessing data in memory).

In addition, "judgment" is considered to mean "judging" resolving, selecting, choosing, establishing, comparing, etc. Good too. In other words, "judgment (decision)" may be considered to be "judgment (decision)" of some action.

Further, "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

As used in this disclosure, the terms "connected", "coupled", or any variations thereof refer to any connection or coupling, direct or indirect, between two or more elements. can 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, "connection" may be replaced with "access."

In this disclosure, when two elements are connected, they may be connected using one or more electrical wires, cables, printed electrical connections, etc., as well as in the radio frequency domain, microwave can be considered to be "connected" or "coupled" to each other using electromagnetic energy having wavelengths in the light (both visible and invisible) range.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." Note that the term may also mean that "A and B are each different from C". Terms such as "separate" and "coupled" may also be interpreted similarly to "different."

Where "include", "including" and variations thereof are used in this disclosure, these terms are inclusive, as is the term "comprising". It is intended that Furthermore, the term "or" as used in this disclosure is not intended to be exclusive or.

In this disclosure, when articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are plural.

Although the invention according to the present disclosure has been described in detail above, it is clear for those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the invention as determined based on the claims. Therefore, the description of the present disclosure is for the purpose of illustrative explanation and does not have any limiting meaning on the invention according to the present disclosure.

Claims (3)

a control unit that controls beam failure detection;
a transmitter that transmits first information notifying the occurrence of the beam failure and second information regarding at least one of the cell in which the beam failure has been detected and the new candidate beam, based on priority. death,
The terminal is characterized in that the priority of the second information is determined based on the reception timing of a UL grant that schedules the second information . controlling the detection of beam disturbances;
transmitting first information notifying the occurrence of the beam failure and second information regarding at least one of a cell in which the beam failure has been detected and a new candidate beam, based on priority. ,
A wireless communication method for a terminal , wherein the priority of the second information is determined based on the reception timing of a UL grant that schedules the second information . A system having a terminal and a base station,
The terminal includes a control unit that controls beam failure detection;
a transmitter that transmits first information notifying the occurrence of the beam failure and second information regarding at least one of the cell in which the beam failure has been detected and the new candidate beam, based on priority. death,
The priority of the second information is determined based on the reception timing of a UL grant that schedules the second information,
A system characterized in that the base station includes a receiving unit that receives the first information and the second information that are transmitted based on the priority.

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