WO2021064921A1 - 端末及び無線通信方法 - Google Patents
端末及び無線通信方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0868—Hybrid systems, i.e. switching and combining
- H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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Definitions
- the present disclosure relates to terminals and wireless communication methods in next-generation mobile communication systems.
- LTE Long Term Evolution
- 3GPP Rel.10-14 LTE-Advanced (3GPP Rel.10-14) has been specified for the purpose of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).
- a successor system to LTE for example, 5th generation mobile communication system (5G), 5G + (plus), New Radio (NR), 3GPP Rel.15 or later, etc.) is also being considered.
- 5G 5th generation mobile communication system
- 5G + plus
- NR New Radio
- 3GPP Rel.15 or later, etc. is also being considered.
- Radio Link Monitoring: RLM Radio Link Monitoring
- RLF Radio Link Failure
- UE User Equipment
- Beam Failure BF
- BFR Beam Failure Recovery
- BFRQ Beam Failure Recovery reQuest
- the UE reports beam failure detection notification, information about the beam failure generating cell, and information about the new candidate beam (also called a new candidate beam) using one or more steps. ..
- one of the purposes of the present disclosure is to provide a terminal and a wireless communication method for appropriately performing the BFR procedure.
- the terminal includes a first information for notifying the occurrence of a beam failure, a transmission unit for transmitting a second information regarding at least one of the cell in which the beam failure is detected and the new candidate beam, When the second information is transmitted after the first information is triggered, the cancellation of the triggered first information and the stop of the timer started based on the transmission of the first information are performed. It is characterized by having a control unit that performs at least one.
- the BFR procedure can be performed appropriately.
- FIG. 1 shows Rel. 15 It is a figure which shows an example of the BFR procedure in NR.
- FIG. 2 is a diagram showing an example of a novel BFR procedure.
- 3A and 3B are diagrams showing an example of transmission control of SR for BFR according to the first aspect.
- 4A and 4B are diagrams showing an example of transmission control of SR for BFR according to the second aspect.
- 5A and 5B are diagrams showing an example of transmission control of SR for BFR according to the third aspect.
- FIG. 6 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- FIG. 7 is a diagram showing an example of the configuration of the base station according to the embodiment.
- FIG. 8 is a diagram showing an example of the configuration of the user terminal according to the embodiment.
- FIG. 9 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.
- a UE and a base station have a beam used for transmitting a signal (also referred to as a transmitting beam, a Tx beam, etc.) and a beam used for receiving a signal (also referred to as a receiving beam, an Rx beam, etc.). ) May be used.
- gNodeB gNodeB
- RLF Radio Link Failure
- BFR Beam Failure Recovery
- BF beam failure
- link failure link failure
- RLF wireless link failure
- FIG. 1 shows Rel. 15 It is a figure which shows an example of the beam recovery procedure in NR.
- the number of beams is an example and is not limited to this.
- the UE performs a measurement based on a reference signal (RS) resource transmitted using the two beams.
- RS reference signal
- the RS may be at least one of a synchronization signal block (Synchronization Signal Block: SSB) and a channel state measurement RS (Channel State Information RS: CSI-RS).
- SSB may be called an SS / PBCH (Physical Broadcast Channel) block or the like.
- RS is 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 the SSB, SSB, CSI-RS, and a demodulation reference signal (RS).
- DeModulation Reference Signal DMRS
- the RS measured in step S101 may be referred to as RS (Beam Failure Detection RS: BFD-RS) for detecting beam obstacles.
- step S102 the UE cannot detect BFD-RS (or the reception quality of RS deteriorates) because the radio wave from the base station is disturbed.
- Such interference can 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. For example, the UE may detect the occurrence of a beam failure when the block error rate (BLER) is less than the threshold value for all of the set BFD-RS (BFD-RS resource settings). When the occurrence of a beam failure is detected, the lower layer (physical (PHY) layer) of the UE may notify (instruct) the beam failure instance to the upper layer (MAC layer).
- BLER block error rate
- BFD-RS resource settings the threshold value for all of the set BFD-RS
- the criterion (criteria) for judgment is not limited to BLER, and may be the reference signal reception power (Layer 1 Reference Signal Received Power: L1-RSRP) in the physical layer. Further, instead of RS measurement or in addition to RS measurement, beam fault detection may be performed based on a downlink control channel (Physical Downlink Control Channel: PDCCH) or the like.
- the BFD-RS may be expected to be a pseudo-collocation (Quasi-Co-Location: QCL) with the DMRS of the PDCCH monitored by the UE.
- the QCL is an index showing the statistical properties of the channel. For example, when one signal / channel and another signal / channel have a QCL relationship, Doppler shift, Doppler spread, and average delay are performed between these different signals / channels. ), Delay spread, Spatial parameter (for example, Spatial receive filter / parameter (Spatial Rx Filter / Parameter), Spatial transmission filter / parameter (Spatial Tx (transmission) Filter / Parameter)) It may mean that one can be assumed to be the same (QCL for at least one of these).
- the spatial reception parameter may correspond to the received beam of the UE (for example, the received analog beam), or the beam may be specified based on the spatial QCL.
- the QCL (or at least one element of the QCL) in the present disclosure may be read as a spatial QCL (sQCL).
- BFD-RS eg, RS index, resource, number, number of ports, precoding, etc.
- BFD beam fault detection
- Information on BFD-RS may be referred to as information on resources for BFR.
- the upper layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- MAC Control Element For MAC signaling, for example, a MAC control element (MAC Control Element (CE)), a MAC Protocol Data Unit (PDU), or the like may be used.
- the broadcast information includes, for example, a master information block (Master Information Block: MIB), a system information block (System Information Block: SIB), a minimum system information (Remaining Minimum System Information: RMSI), and other system information (Other System Information). : OSI) and the like.
- the MAC layer of the UE may start a predetermined timer (which may be called a beam failure detection timer) when the beam failure instance notification is received from the PHY layer of the UE.
- a beam failure detection timer which may be called a beam failure detection timer
- the MAC layer of the UE receives a beam failure instance notification a certain number of times (for example, beamFailureInstanceMaxCount set by RRC) or more before the timer expires, it triggers BFR (for example, one of the random access procedures described later) is started. ) May.
- the UE When there is no notification from the UE (for example, the time without notification exceeds a predetermined time), or when the base station receives a predetermined signal (beam recovery request in step S104) from the UE, the UE causes a beam failure. May be determined to have been detected.
- step S103 the UE starts searching for a new candidate beam (new candidate beam) to be newly used for communication in order to recover the beam.
- the UE may select a new candidate beam corresponding to a predetermined RS by measuring the predetermined RS.
- the RS measured in step S103 may be called RS (New Candidate Beam Identification RS: NCBI-RS), CBI-RS, Candidate Beam RS (CB-RS), or the like for identifying a new candidate beam.
- NCBI-RS may be the same as or different from BFD-RS.
- the new candidate beam may be referred to as a new candidate beam, a candidate beam, or a new beam.
- the UE may determine a beam corresponding to RS satisfying a predetermined condition as a new candidate beam.
- the UE may determine a new candidate beam based on, for example, the RS of the set NCBI-RS in which L1-RSRP exceeds the threshold value.
- the criteria for judgment are not limited to L1-RSRP. It may be determined 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.
- the L1-RSRQ for SSB may be referred to as SS-RSRQ.
- the L1-RSRQ for CSI-RS may be referred to as CSI-RSRQ.
- L1-SINR for SSB may be referred to as SS-SINR.
- L1-SINR for CSI-RS may be referred to as CSI-SINR.
- NCBI-RS for example, RS resources, number, number of ports, precoding, etc.
- NCBI new candidate beam identification
- Information about NCBI-RS may be acquired based on information about BFD-RS.
- Information on NCBI-RS may be referred to as information on resources for NCBI.
- BFD-RS may be read as a wireless link monitoring reference signal (RLM-RS: Radio Link Monitoring RS).
- RLM-RS Radio Link Monitoring RS
- the UE that has identified the new candidate beam in step S104 transmits a beam recovery request (Beam Failure Recovery reQuest: BFRQ).
- the beam recovery request may be referred to as a beam recovery request signal, a beam fault recovery request signal, or the like.
- the BFRQ may be transmitted using, for example, a random access channel (Physical Random Access Channel: PRACH).
- the BFRQ may include information on the new candidate beam identified in step S103.
- Resources for the BFRQ may be associated with the new candidate beam.
- Beam information includes beam index (Beam Index: BI), port index of a predetermined reference signal, resource index (for example, CSI-RS Resource Indicator: CRI), SSB resource index (SSBRI), etc. May be notified using.
- CB-BFR Contention-Based BFR
- CF-BFR Contention-Free BFR
- the UE may transmit a preamble (also referred to as RA preamble, Random Access Channel (PRACH), RACH preamble, etc.) as a BFRQ using PRACH resources.
- RA Random Access Channel
- PRACH Random Access Channel
- the base station that has detected BFRQ transmits a response signal (may be called BFR response, gNB response, etc.) to BFRQ from the UE.
- the response signal may include reconstruction 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 PDCCH.
- the response signal is notified using a PDCCH (DCI) having a cyclic redundancy check (Cyclic Redundancy Check: CRC) scrambled by a UE identifier (for example, Cell-Radio RNTI (C-RNTI)). May be done.
- DCI PDCCH
- CRC Cyclic Redundancy Check
- C-RNTI Cell-Radio RNTI
- the UE may monitor the response signal based on at least one of the control resource set for BFR (COntrol REsource SET: CORESET) and the search space set for BFR. For example, the UE may detect a DCI with a CRC scrambled with C-RNTI in a individually configured BFR search space within CORESET.
- COntrol REsource SET CORESET
- CB-BFR when the UE receives the PDCCH corresponding to C-RNTI related to itself, it may be determined that the conflict resolution (contention resolution) is successful.
- a period for the UE to monitor the response from the base station (for example, gNB) to the BFRQ may be set.
- the period may be referred to as, for example, a gNB response window, a gNB window, a beam recovery request response window, a BFRQ response window, or the like.
- the UE may resend the BFRQ if there is no gNB response detected within the window period.
- the UE may send a message to the base station indicating that the beam reconstruction is completed.
- the message may be transmitted by, for example, PUCCH or PUSCH.
- the UE may receive the RRC signaling indicating the setting of the Transmission Configuration Indication state (TCI state) used for the PDCCH, or may receive the MAC CE indicating the activation of the setting.
- TCI state Transmission Configuration Indication state
- Successful beam recovery may represent, for example, the case where step S106 is reached.
- the beam recovery failure may correspond to, for example, that the BFRQ transmission has reached a predetermined number of times, or the beam failure recovery timer (Beam-failure-recovery-Timer) has expired.
- the uplink control channel (PUCCH) and the MAC control information (MAC CE) are used to notify the occurrence of the beam failure and beam. It is being considered to report information on the cell (or CC) that detected the failure and information on the new candidate beam.
- the UE may use one or more steps (eg, two steps) to notify the occurrence of a beam failure, report information about the cell that detected the beam failure, and report information about the new candidate beam. (See Fig. 2).
- the reporting operation is not limited to two steps.
- the uplink control channel can set resources more flexibly in the time domain compared to PRACH. Therefore, it is effective to use the uplink control channel (PUCCH) as the channel used for the transmission of BFRQ.
- MAC CE PUSCH
- PUSCH can set resources more flexibly in the time domain as compared with PRACH. Therefore, it is conceivable to use MAC CE (PUSCH) as a channel used for BFRQ transmission.
- the UE notifies the occurrence of a beam failure by using the uplink control channel (PUCCH) in the first step (or step 1). Further, the UE uses MAC control information (for example, MAC CE or MAC PDU including MAC CE) in the second step (or step 1) to obtain information on a cell in which a beam failure is detected and a new candidate beam. It is expected to report at least one piece of information.
- PUCCH uplink control channel
- MAC control information for example, MAC CE or MAC PDU including MAC CE
- the PUCCH in the first step for example, it is considered to use a method (dedicated SR-like PUCCH) similar to the transmission of the scheduling request (SR).
- the MAC CE (or MAC PDU) in the second step may be transmitted using the uplink shared channel (PUSCH).
- the base station allocates uplink resources to the UE in response to a request from the UE (Scheduling Request (SR)).
- the uplink resource is a resource (UL-SCH resource) for a logical uplink channel (for example, Uplink Shared Channel (UL-SCH)) or a physical uplink channel (for example, Physical Uplink). It may be paraphrased as a resource for Shared Channel)).
- the UE may transmit the SR using an uplink control channel (for example, PUCCH).
- PUCCH format used for SR transmission may be, for example, PUCCH format (PUCCH format (PF)) 0 or 1.
- PF0 may be composed of 1 or 2 symbols.
- PF1 may be composed of 4 or more symbols.
- a predetermined period for SR transmission using PUCCH (also referred to as transmission occasion, SR transmission opportunity, SR opportunity, transmission period, instance, etc.) may be provided at a predetermined cycle.
- the SR opportunity may be configured uniquely to the UE.
- the UE may be configured with 0 or 1 or more SR configurations (for example, SR configuration).
- One SR setting may constitute (or may be associated with) a set of resources (SR resources) for one or more SR transmissions.
- the SR resource is set over at least one of one or more bandwidth parts (Bandwidth Part (BWP)) and one or more cells (serving cell, component carrier (CC), carrier, etc.). May be done.
- BWP Bandwidth Part
- CC component carrier
- a maximum of one SR resource may be set for one logical channel per BWP.
- Each SR setting may correspond to one or more logical channels (Logical Channel (LCH)). Each LCH may be mapped to 0 or 1 SR setting.
- the SR setting may be set in the UE by higher layer signaling (for example, Radio Resource Control (RRC) signaling). Each LCH may have a priority value.
- RRC Radio Resource Control
- Each LCH may have a priority value.
- the SR setting may be simply referred to as SR.
- the UE may receive information about one or more sets of SR settings (SR setting set information).
- the SR setting set information may be, for example, "SchedulingRequestConfig" of the RRC control element (Information Element (IE)).
- the SR setting set information may be set for each cell group, and may be included in, for example, "MAC-Cell Group Config" of RRC IE. Further, the SR setting set information may be set as a MAC parameter.
- the RRC IE may be referred to as an RRC parameter, an upper layer parameter, or the like.
- Each SR setting information may include at least one of the following parameters.
- -SR setting information (or SR setting) identifier (SR-ID, for example, "schedulingRequestId” of RRC IE)
- SR-ID for example, "schedulingRequestId” of RRC IE
- PUCCH for example, "sr-Prohibit Timer” of RRC IE
- Maximum number of SR transmissions for example, "sr-TransMax” of RRC IE
- the SR-ID in each SR setting information may be used to identify an SR instance (SR setting) in the MAC layer.
- the SR-ID may be included in the LCH setting information (LCH setting information, for example, "Logical Channel Config" of RRC IE). That is, the SR-ID may be used as an identifier for the SR setting associated with the LCH.
- the UE may receive information (SR resource information) regarding the SR resource associated with each SR setting.
- the SR resource information may be, for example, "SchedulingRequestResourceConfig" of RRC IE.
- the SR resource information may be set as a UE-specific PUCCH parameter.
- the SR resource information may be included in the PUCCH setting information for each BWP (PUCCH setting information, for example, "PUCCH-Config" of RRC IE).
- the PUCCH setting information may include a list of one or more SR resource information (for example, "schedulingRequestResourceToAddModList" of RRC IE).
- the SR resource information may include, for example, at least one of the following parameters.
- -SR resource information identifier SR resource ID, for example, "schedulingRequestResourceId" of RRC IE
- SR resource ID for example, "schedulingRequestResourceId” of RRC IE
- SR-ID for example, "schedulingRequestID” of RRC IE
- SR-Information indicating at least one of the period and offset of the SR resource (also referred to as SR opportunity, etc.)
- period / offset information for example, "periodicityAndOffset" of RRC IE.
- -PUCCH resource identifier (PUCCH resource ID, for example, "PUCCH-ResourceId" of RRC IE)
- the SR resource set by the SR resource information may be associated with the SR setting information (or SR setting) identified by the SR-ID.
- the SR resource may include at least one of the above SR opportunity and PUCCH resource.
- the cycle may be, for example, 2 or 7 symbols, 1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 160, 320 or 640 slots.
- SCS subcarrier spacing
- the UE may transmit SR using the PUCCH resource indicated by the PUCCH resource ID at the SR opportunity of a predetermined cycle determined based on the cycle / offset information.
- the UE may control the transmission of the SR based on the SR setting information indicated by the SR-ID.
- the UE may transmit the first information notifying the occurrence of the beam failure by using the SR in the BFR procedure.
- the SR used for notifying the occurrence of a beam failure may be referred to as a BFR SR, a SCell BFR SR, a dedicated SR for SCell, or a dedicated SR.
- the question is whether to do it.
- a predetermined timer is set based on the transmission of the SR for BFR, how to control the predetermined timer when transmitting a MAC PDU (or PUSCH) including the BFR MAC CE becomes a problem.
- the present inventors have studied transmission control when a scheduling request (for example, SR for BFR) is used for notification of the occurrence of a beam failure, and have conceived an aspect of the present invention.
- a scheduling request for example, SR for BFR
- (First aspect) an example of UE operation in the case of transmitting the first information notifying the occurrence of the beam failure and the second information regarding at least one of the cell in which the beam failure is detected and the new candidate beam will be described. To do. Specifically, when the second information is transmitted after the first information is triggered, at least one of the triggered first information and the timer set based on the transmission of the first information. To cancel.
- the SR for BFR (or dedicated SR) is used for the transmission of the first information and the BFR MAC CE (or the MAC PDU including the BFR MAC CE) is used for the transmission of the second information.
- the SR for BFR may be transmitted by PUCCH, and the MAC PDU may be transmitted by PUSCH.
- the signal or channel used for transmitting the first information and the second information is not limited to this.
- the network may schedule a PUSCH (for example, a PUSCH used for transmitting a BFR MAC CE) based on the BFR SR transmitted from the UE.
- the UE may transmit the BFR MAC CE using the PUSCH scheduled based on the SR for BFR, or may transmit the BFR MAC CE using another PUSCH.
- the other PUSCH may be a PUSCH scheduled without being based on the SR for BFR, or may be a set grant-based PUSCH.
- the UE may cancel the BFR SR (or the pending BFR SR) triggered before the MAC PDU (FIG. 3B). reference). Further, when the SR for BFR is triggered and the MAC PDU is transmitted, the UE may stop the timer if the timer related to the SR for BFR is running (or running) (Fig.). See 3A).
- the MAC PDU may have a configuration that includes at least BFR MAC CE and does not include BSR.
- the resource of the SR for BFR the resource set for SR used for other purposes (for example, transmission of other information such as a buffer status report (BSR)) may be used.
- the resources of the SR for BFR may be set separately from the resources set for the SR used for other purposes.
- FIG. 3A shows a case where a BFR SR is transmitted based on the trigger after the BFR SR is triggered, a BFR SR is transmitted, and then a MAC PDU including a BFR MAC CE is transmitted.
- the UE may trigger the SR for BFR when a predetermined condition is satisfied.
- the predetermined condition may be the generation of BFR (for example, when the transmission power of the reference signal is less than the threshold value).
- the trigger of the SR for BFR may be controlled regardless of the presence or absence of a trigger of the SR (also referred to as a normal SR) used for other purposes (for example, transmission of other information such as BSR).
- the UE may also determine that the triggered BFR SR is in a pending state until canceled.
- the UE may start (or start) the related timer based on the transmission of the SR for BFR.
- the related timer of the SR for BFR is running (or running), the transmission of the SR for BFR may be prohibited.
- the related timer of SR for BFR may be called a new timer (new timer), sr-Prohibit Timer or sr-Prohibit Timer for BFR.
- the UE may control to stop the related timer of the SR for BFR when transmitting the MAC PDU including the BFR MAC CE.
- a MAC PDU including BFR MAC CE is transmitted, it is not necessary to transmit SR for BFR. Therefore, by stopping the related timer, unnecessary operation can be reduced and UE operation can be simplified.
- FIG. 3B shows a case where a MAC PDU including a BFR MAC CE is transmitted before the BFR SR is transmitted when the BFR SR is triggered.
- the UE may control to cancel the pending BFR SR triggered before the transmission of the MAC PDU.
- FIG. 3B shows a case where the pending BFR SR (or the triggered BFR SR) is canceled when the MAC PDU including the BFR MAC CE is transmitted before the BFR SR is transmitted.
- the timing to do this is not limited to this.
- the pending BFR SR (or the triggered BFR SR) is canceled until at least one of the following conditions 1 and 2 is satisfied. It may be controlled not to.
- Condition 1 Until it is determined that the reception of the MAC PDU is successful in the network (for example, the base station)
- Condition 2 The transmission configuration index (TCI) state is changed (or updated, activated) in the cell where the beam failure has occurred. Until
- the UE After transmitting the MAC PDU including the BFR MAC CE, the UE determines that the reception of the MAC PDU at the base station is successful when the retransmission of the PUSCH for the BFR MAC CE transmission is not triggered or scheduled. May be good.
- the UE controls to cancel the pending BFR SR (or the triggered BFR SR) when transmitting the MAC PDU and satisfying at least one of the conditions 1 and 2. May be good.
- the base station fails to receive the MAC PDU including the BFR MAC CE, the BFR SR can be continuously transmitted, so that the delay of the BFR procedure can be suppressed.
- the UE may control to stop the related timer of the SR for BFR when transmitting the MAC PDU and satisfying at least one of the condition 1 and the condition 2.
- the UE may control the timer related to the SR for BFR so as not to stop before the timer expires.
- SR for BFR SR used for other purposes
- normal SR SR used for other purposes
- the SR for BFR is used for notifying the occurrence of a beam failure or requesting the PUSCH resource for transmitting the second information (BFR MAC CE), and the normal SR is used for requesting the PUSCH resource for transmitting the BSR.
- BFR MAC CE second information
- normal SR is used for requesting the PUSCH resource for transmitting the BSR.
- the UE When one or more normal SRs and a BFR SR are triggered and a MAC PDU including the BSR is transmitted, the UE is a normal SR (or a pending normal SR) triggered before the MAC PDU. May be canceled (see FIG. 4). Further, when one or more normal SRs and one or more normal SRs and a BFR SR are triggered and a MAC PDU including the BSR is transmitted, a timer (for example, sr-ProhibitTimer) related to the normal SR is activated (or the UE). If you are running), you may stop the timer (see FIG. 4).
- a timer for example, sr-ProhibitTimer
- the MAC PDU includes at least the buffer status report (BSR), and the BFR MAC CE is not included. Further, the MAC PDU may be configured to include a BSR MAC CE including a buffer state up to the last event that triggered the BSR by the normal SR.
- the BSR MAC CE may be a long BSR MAC CE and a short BSR MAC CE. Further, in the present specification, BSR may be read as BSR MAC CE.
- FIG. 4A shows a case where the normal SR1, SR2, SR3, and the SR for BFR are triggered before the transmission of the MAC PDU including the BSR, and the normal SR1 is transmitted based on the trigger of the normal SR1. That is, the case where the MAC PDU including the BSR is transmitted before the normal SR2, SR3, and the SR for BFR are transmitted is shown. The UE may determine that it is in a pending state until the triggered normal SR and BFR SR are cancelled.
- the UE may start a related timer (for example, sr-ProhibitTimer) based on the transmission of the normal SR1.
- a related timer for example, sr-ProhibitTimer
- the UE may control to cancel the pending normal SRs (here, normal SR2 and SR3) triggered before the transmission of the MAC PDU.
- the UE may control not to cancel the pending SR for BFR triggered before the transmission of the MAC PDU.
- the UE may transmit the SR for BSR based on the SR for BSR triggered after transmitting the MAC PDU including the BSR.
- the UE may control to stop the timer of the normal SR during running (here, the timer corresponding to SR1) when the MAC PDU including the BSR is transmitted.
- the normal SR1, SR2, SR3, and the SR for BFR are triggered before the transmission of the MAC PDU including the BSR, and the normal SR1 based on the trigger of the normal SR1 and the SR for BFR based on the trigger for BFR are transmitted.
- the UE may start a related timer (for example, sr-ProhibitTimer) based on the transmission of the normal SR1.
- a related timer for example, sr-ProhibitTimer
- the UE may start a related timer based on the transmission of the BFR SR.
- the UE may control to cancel the pending normal SRs (here, normal SR2 and SR3) triggered before the transmission of the MAC PDU.
- the UE may control to stop the timer of the normal SR during running (here, the timer corresponding to SR1) when the MAC PDU including the BSR is transmitted.
- the UE may control the timer related to the SR for BFR during running so as not to stop.
- At least one of the triggered normal SR (pending normal SR) and the timer related to the normal SR may be controlled (unaffected) regardless of the transmission of the MAC PDU including the BFR MAC CE. That is, when a MAC PDU including BFR MAC CE (MAC PDU not including BSR) is transmitted after the normal SR is triggered, the pending SR for BFR (or related timer) is canceled (or stopped). , Normal SR may be controlled so as not to cancel.
- At least one of the triggered BFR SR (pending BFR SR) and the timer related to the BFR SR is canceled or stopped when a MAC PDU including the BSR is transmitted as in the normal SR. It may be controlled as follows. In this case, if the resource or capacity of the PUSCH scheduled or triggered by the transmission of the normal SR is sufficient, the UE transmits the BFR MAC CE (or the MAC PDU including the BFR MAC CE) using the PUSCH. You may.
- SR first information used for notifying the occurrence of beam failure
- normal SR SR used for other purposes
- An example of is described. Specifically, when transmitting a MAC PDU including a BFR MAC CE and a BSR after the BFR SR and the normal SR are triggered, at least one of the trigger and the timer of the predetermined SR is canceled.
- the SR for BFR is used for notifying the occurrence of a beam failure or requesting the PUSCH resource for transmitting the second information (BFR MAC CE), and the normal SR is used for requesting the PUSCH resource for transmitting the BSR.
- BFR MAC CE second information
- normal SR is used for requesting the PUSCH resource for transmitting the BSR.
- the UE may cancel the normal SR (for example, the pending normal SR) and the BFR SR (for example, the pending BFR SR) triggered before the MAC PDU (see FIG. 5). ). Further, the UE may stop the timer if at least one of the timer related to the normal SR (for example, sr-ProhibitTimer) and the timer related to the SR for BFR is running (or running) (for example). (See FIG. 5).
- the timer related to the normal SR for example, sr-ProhibitTimer
- FIG. 5A shows a case where the normal SR1, SR2, SR3, and the SR for BFR are triggered before the transmission of the BFR MAC CE and the MAC PDU including the BSR, and the normal SR1 is transmitted based on the trigger of the normal SR1. That is, the case where the MAC PDU is transmitted before the normal SR2, SR3, and SR for BFR are transmitted is shown. The UE may determine that it is in a pending state until the triggered normal SR and BFR SR are cancelled.
- the UE controls to cancel the pending SR (here, normal SR2, SR3 and SR for BFR) triggered before the transmission of the MAC PDU. You may.
- the UE may control to stop the timer of the SR during running (here, the timer corresponding to SR1) when the MAC PDU including the BFR MAC CE and the BSR is transmitted.
- FIG. 5B shows a case where the normal SR1, SR2, SR3, and the SR for BFR are triggered before the transmission of the MAC PDU including the BFR MAC CE and BSR, and the normal SR1 and the SR for BFR are transmitted. That is, the case where the MAC PDU is transmitted before the normal SR2 and SR3 are transmitted is shown.
- the UE may start a related timer (for example, sr-ProhibitTimer) based on the transmission of the normal SR1.
- a related timer for example, sr-ProhibitTimer
- the UE may start a related timer based on the transmission of the BFR SR.
- the UE may control to cancel the pending SR (here, normal SR2, SR3) triggered before the transmission of the MAC PDU.
- SR normal SR2, SR3
- the UE may control to stop the running timer (here, the timer related to SR1 and the timer related to SR for BFR) when the MAC PDU is transmitted.
- the running timer here, the timer related to SR1 and the timer related to SR for BFR
- FIG. 5 shows a case where the pending BFR SR (or the triggered BFR SR) is canceled when the MAC PDU is transmitted before the BFR SR is transmitted, but the timing of canceling is set to this. Not limited.
- the pending BFR SR (or the triggered BFR SR) is canceled until at least one of the following conditions 1 and 2 is satisfied. It may be controlled not to.
- Condition 1 Until it is determined that the reception of the MAC PDU is successful in the network (for example, base station)
- Condition 2 Until the TCI state is changed (or updated or activated) in the cell where the beam failure occurred.
- the UE After transmitting the MAC PDU including the BFR MAC CE and BSR, the UE determines that the reception of the MAC PDU at the base station is successful when the retransmission of the PUSCH for the BFR MAC CE transmission is not triggered or scheduled. You may.
- the UE controls to cancel the pending BFR SR (or the triggered BFR SR) when transmitting the MAC PDU and satisfying at least one of the conditions 1 and 2. May be good.
- the cancellation timings of the BFR SR and the normal SR may be different.
- the base station fails to receive the MAC PDU including the BFR MAC CE, the BFR SR can be continuously transmitted, so that the delay of the BFR procedure can be suppressed.
- the UE may control to stop the related timer of the SR for BFR when transmitting the MAC PDU and satisfying at least one of the condition 1 and the condition 2.
- the UE may control the timer related to the SR for BFR so as not to stop before the timer expires.
- both the pending BFR SR and the normal SR are canceled, but the present invention is not limited to this.
- the UE may control to cancel one of the pending BFR SR and the normal SR after transmitting the MAC PDU including the BFR MAC CE and the BSR.
- the UE may control to stop one of the timer related to the SR for BFR and the timer related to the normal SR after transmitting the MAC PDU including the BFR MAC CE and the BSR.
- the UE may prioritize the transmission of either one (for example, BFR MAC CE). In such a case, the UE may control not to cancel the SR that did not transmit the corresponding MAC PDU or stop the timer related to the SR.
- wireless communication system Wireless communication system
- communication is performed using any one of the wireless communication methods according to each of the above-described embodiments of the present disclosure or a combination thereof.
- FIG. 6 is a diagram showing 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 Third Generation Partnership Project (3GPP). ..
- the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)).
- MR-DC is 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) may be included.
- the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)).
- the base station (gNB) of NR is MN
- the base station (eNB) of LTE (E-UTRA) is SN.
- the wireless communication system 1 has dual connectivity between a plurality of base stations in the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) in which both MN and SN are NR base stations (gNB). )) May be supported.
- a plurality of base stations in the same RAT for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) in which both MN and SN are NR base stations (gNB). )
- NR-NR Dual Connectivity NR-DC
- gNB NR base stations
- the wireless communication system 1 includes a base station 11 that forms a macro cell C1 having a relatively wide coverage, and a base station 12 (12a-12c) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. You may prepare.
- the user terminal 20 may be located in at least one cell. The arrangement, number, and the like of each cell and the user terminal 20 are not limited to the mode shown in the figure.
- the base stations 11 and 12 are not distinguished, they are collectively referred to as the 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 use at least one of carrier aggregation (Carrier Aggregation (CA)) and dual connectivity (DC) using a plurality of component carriers (Component Carrier (CC)).
- CA Carrier Aggregation
- DC dual connectivity
- CC Component Carrier
- 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)).
- the macro cell C1 may be included in FR1 and the small cell C2 may be included in FR2.
- FR1 may be in a frequency band of 6 GHz or less (sub 6 GHz (sub-6 GHz)), and FR2 may be in a frequency band higher than 24 GHz (above-24 GHz).
- the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.
- the user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- 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).
- wire for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication for example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 corresponding to the higher-level station is an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to a relay station (relay) is IAB. It may be called a node.
- IAB Integrated Access Backhaul
- relay station relay station
- the base station 10 may be connected to the core network 30 via another base station 10 or directly.
- the core network 30 may include at least one such as Evolved Packet Core (EPC), 5G Core Network (5GCN), and Next Generation Core (NGC).
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.
- a wireless access method based on Orthogonal Frequency Division Multiplexing may be used.
- OFDM Orthogonal Frequency Division Multiplexing
- DL Downlink
- UL Uplink
- CP-OFDM Cyclic Prefix OFDM
- DFT-s-OFDM Discrete Fourier Transform Spread OFDM
- OFDMA Orthogonal Frequency Division Multiple. Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the wireless access method may be called a waveform.
- another wireless access system for example, another single carrier transmission system, another multi-carrier transmission system
- the UL and DL wireless access systems may be used as the UL and DL wireless access systems.
- downlink shared channels Physical Downlink Shared Channel (PDSCH)
- broadcast channels Physical Broadcast Channel (PBCH)
- downlink control channels Physical Downlink Control
- Channel PDCCH
- the uplink shared channel Physical Uplink Shared Channel (PUSCH)
- the uplink control channel Physical Uplink Control Channel (PUCCH)
- the random access channel shared by each user terminal 20 are used.
- Physical Random Access Channel (PRACH) Physical Random Access Channel or the like may be used.
- User data, upper layer control information, System Information Block (SIB), etc. are transmitted by PDSCH.
- User data, upper layer control information, and the like may be transmitted by the PUSCH.
- the Master Information Block (MIB) may be transmitted by the PBCH.
- Lower layer control information may be transmitted by PDCCH.
- the lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of PDSCH and PUSCH.
- DCI Downlink Control Information
- the DCI that schedules PDSCH may be called DL assignment, DL DCI, etc.
- the DCI that schedules PUSCH may be called UL grant, UL DCI, etc.
- the PDSCH may be read as DL data
- the PUSCH may be read as UL data.
- a control resource set (COntrol REsource SET (CORESET)) and a search space (search space) may be used to detect PDCCH.
- CORESET corresponds to a resource that searches for DCI.
- the search space corresponds to the search area and search method of PDCCH candidates (PDCCH candidates).
- One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a search space based on the search space settings.
- 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.
- the "search space”, “search space set”, “search space setting”, “search space set setting”, “CORESET”, “CORESET setting”, etc. of the present disclosure may be read as each other.
- channel state information (Channel State Information (CSI)
- delivery confirmation information for example, it may be called Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.
- scheduling request (Scheduling Request () Uplink Control Information (UCI) including at least one of SR)
- the PRACH may transmit a random access preamble to establish a connection with the cell.
- downlinks, uplinks, etc. may be expressed without “links”. Further, it may be expressed without adding "Physical" at the beginning of various channels.
- a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like may be transmitted.
- the DL-RS includes a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and a demodulation reference signal (DeModulation).
- CRS Cell-specific Reference Signal
- CSI-RS Channel State Information Reference Signal
- DeModulation Demodulation reference signal
- Reference Signal (DMRS)), positioning reference signal (Positioning Reference Signal (PRS)), phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), and the like may be transmitted.
- PRS Positioning Reference Signal
- PTRS Phase Tracking Reference Signal
- the synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- the signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be referred to as SS / PBCH block, SS Block (SSB) and the like.
- SS, SSB and the like may also be called a reference signal.
- a measurement reference signal Sounding Reference Signal (SRS)
- a demodulation reference signal DMRS
- UL-RS Uplink Reference Signal
- UE-specific Reference Signal UE-specific Reference Signal
- FIG. 7 is a diagram showing an example of the configuration of the base station according to the embodiment.
- the base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140.
- the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may each be provided with one or more.
- this example mainly shows the functional blocks of the feature portion in the present embodiment, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each part described below may be omitted.
- the control unit 110 controls the entire base station 10.
- the control unit 110 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.
- the control unit 110 may control signal generation, scheduling (for example, resource allocation, mapping) and the like.
- the control unit 110 may control transmission / reception, measurement, and the like using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140.
- the control unit 110 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 120.
- the control unit 110 may perform call processing (setting, release, etc.) of the communication channel, state management of the base station 10, management of radio resources, and the like.
- the transmission / reception unit 120 may include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123.
- the baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212.
- the transmitter / receiver 120 includes a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on common recognition in the technical fields according to the present disclosure. be able to.
- the transmission / reception unit 120 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122.
- the receiving unit may be composed of a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.
- the transmitting / receiving antenna 130 can be composed of an antenna described based on common recognition in the technical field according to the present disclosure, for example, an array antenna.
- the transmission / reception unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmission / reception unit 120 may receive the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmission / reception unit 120 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.
- digital beamforming for example, precoding
- analog beamforming for example, phase rotation
- the transmission / reception unit 120 processes, for example, Packet Data Convergence Protocol (PDCP) layer processing and Radio Link Control (RLC) layer processing (for example, RLC) for data, control information, etc. acquired from control unit 110.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control for example, HARQ retransmission control
- the transmission / reception unit 120 performs channel coding (may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (Discrete Fourier Transform (DFT)) for the bit string to be transmitted.
- the base band signal may be output by performing processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, digital-analog transform, and other transmission processing.
- IFFT inverse fast Fourier transform
- the transmission / reception unit 120 may perform modulation, filtering, amplification, etc. on the baseband signal to the radio frequency band, and transmit the signal in the radio frequency band via the transmission / reception antenna 130. ..
- the transmission / reception unit 120 may perform amplification, filtering, demodulation to a baseband signal, or the like on the radio frequency band signal received by the transmission / reception antenna 130.
- the transmission / reception unit 120 (reception processing unit 1212) performs analog-digital conversion, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) on the acquired baseband signal. )) Processing (if necessary), filtering, decoding, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing are applied. User data and the like may be acquired.
- FFT fast Fourier transform
- IDFT inverse discrete Fourier transform
- the transmission / reception unit 120 may perform measurement on the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, or the like based on the received signal.
- the measuring unit 123 has received power (for example, Reference Signal Received Power (RSRP)) and reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)).
- RSRP Reference Signal Received Power
- RSSQ Reference Signal Received Quality
- SINR Signal to Noise Ratio
- Signal strength for example, Received Signal Strength Indicator (RSSI)
- propagation path information for example, CSI
- the measurement result may be output to the control unit 110.
- the transmission line interface 140 transmits / receives signals (backhaul signaling) to / from a device included in the core network 30, another base station 10 and the like, and provides user data (user plane data) and control plane for the user terminal 20. Data or the like may be acquired or transmitted.
- the transmission unit and the reception unit of the base station 10 in the present disclosure may be composed of at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140.
- the transmission / reception unit 120 receives first information (for example, SR for BFR) for notifying the occurrence of beam failure and second information (for example, BFR MAC CE) regarding at least one of the cell in which the beam failure is detected and the new candidate beam. ) Is received.
- first information for example, SR for BFR
- second information for example, BFR MAC CE
- the control unit 110 cancels the triggered first information and a timer started based on the transmission of the first information. It may be assumed that at least one of the outages will occur.
- FIG. 8 is a diagram showing an example of the configuration of the user terminal according to the embodiment.
- the user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230.
- the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided with one or more.
- this example mainly shows the functional blocks of the feature portion in 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 part described below may be omitted.
- the control unit 210 controls the entire user terminal 20.
- the control unit 210 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.
- the control unit 210 may control signal generation, mapping, and the like.
- the control unit 210 may control transmission / reception, measurement, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230.
- the control unit 210 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 220.
- the transmission / reception unit 220 may include a baseband unit 221 and an RF unit 222, and a measurement unit 223.
- the baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212.
- the transmitter / receiver 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on the common recognition in the technical field according to the present disclosure.
- the transmission / reception unit 220 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 2211 and an RF unit 222.
- the receiving unit may be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.
- the transmitting / receiving antenna 230 can be composed of an antenna described based on common recognition in the technical field according to the present disclosure, for example, an array antenna.
- the transmission / reception unit 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmission / reception unit 220 may transmit the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmission / reception unit 220 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.
- digital beamforming for example, precoding
- analog beamforming for example, phase rotation
- the transmission / reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (for example, RLC retransmission control), and MAC layer processing (for example, for data, control information, etc. acquired from the control unit 210). , HARQ retransmission control), etc., to generate a bit string to be transmitted.
- RLC layer processing for example, RLC retransmission control
- MAC layer processing for example, for data, control information, etc. acquired from the control unit 210.
- HARQ retransmission control HARQ retransmission control
- the transmission / reception unit 220 (transmission processing unit 2211) performs channel coding (may include error correction coding), modulation, mapping, filtering processing, DFT processing (if necessary), and IFFT processing for the bit string to be transmitted. , Precoding, digital-to-analog conversion, and other transmission processing may be performed to output the baseband signal.
- Whether or not to apply the DFT process may be based on the transform precoding setting.
- the transmission / reception unit 220 transmits the channel using the DFT-s-OFDM waveform.
- the DFT process may be performed as the transmission process, and if not, the DFT process may not be performed as the transmission process.
- the transmission / reception unit 220 may perform modulation, filtering, amplification, etc. on the baseband signal to the radio frequency band, and transmit the signal in the radio frequency band via the transmission / reception antenna 230. ..
- the transmission / reception unit 220 may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 230.
- the transmission / reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering processing, demapping, demodulation, and decoding (error correction) for the acquired baseband signal. Decoding may be included), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.
- the transmission / reception unit 220 may perform measurement on the received signal.
- the measuring unit 223 may perform RRM measurement, CSI measurement, or the like based on the received signal.
- the measuring 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 result may be output to the control unit 210.
- the transmitter and receiver of the user terminal 20 in the present disclosure may be composed of at least one of the transmitter / receiver 220 and the transmitter / receiver antenna 230.
- the transmission / reception unit 220 includes first information (for example, SR for BFR) for notifying the occurrence of beam failure and second information (for example, BFR) regarding at least one of the cell in which the beam failure is detected and the new candidate beam.
- first information for example, SR for BFR
- second information for example, BFR
- MAC CE MAC CE
- control unit 210 When the control unit 210 transmits the second information after the first information is triggered, the control unit 210 cancels the triggered first information and stops the timer started based on the transmission of the first information. You may control to do at least one of.
- the control unit 210 may control to cancel the first information triggered after at least one of the success of transmitting the second information and the change of the TCI state of the cell in which the beam failure has occurred.
- the control unit 210 transmits the first information by using the scheduling request
- the first scheduling request corresponding to the first information and the second scheduling request corresponding to the other information are triggered.
- MAC control information including other information is transmitted later, it is controlled so as not to cancel at least one of the cancellation of the first scheduling request and the stop of the timer started based on the transmission of the first scheduling request. May be good.
- the control unit 210 transmits the first information by using the scheduling request
- the first scheduling request corresponding to the first information and the second scheduling request corresponding to the other information are triggered.
- MAC control information including the first information and other information is later transmitted, it is started based on the cancellation of the triggered first scheduling request and the second scheduling request, and the transmission of the first scheduling request. It may be controlled to stop at least one of the timer and the timer started based on the transmission of the second scheduling request.
- the control unit 210 may control to cancel the first scheduling request triggered after at least one of the successful transmission of the second information and the change of the TCI state of the cell in which the beam failure occurred.
- each functional block may be realized by using one device that is physically or logically connected, or directly or indirectly (for example, by two or more devices that are physically or logically separated). , Wired, wireless, etc.) and may be realized using these plurality of devices.
- the functional block may be realized by combining the software with the one device or the plurality of devices.
- the functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and deemed. , Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc.
- a functional block (constituent unit) for functioning transmission may be referred to as a transmitting unit (transmitting unit), a transmitter (transmitter), or the like.
- the method of realizing each of them is not particularly limited.
- the base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure.
- FIG. 9 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.
- the base station 10 and the 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, and the like. ..
- the hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.
- processor 1001 may be a plurality of processors. Further, the processing may be executed by one processor, or the processing may be executed simultaneously, sequentially, or by using other methods by two or more processors.
- the processor 1001 may be mounted by one or more chips.
- the processor 1001 For each function of the base station 10 and the user terminal 20, for example, by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an operation and communicates via the communication device 1004. It is realized by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.
- predetermined software program
- Processor 1001 operates, for example, an operating system to control the entire computer.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, and the like.
- CPU central processing unit
- control unit 110 210
- transmission / reception unit 120 220
- the like may be realized by the processor 1001.
- the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these.
- a program program code
- the control unit 110 may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and may be realized in the same manner for other functional blocks.
- the memory 1002 is a computer-readable recording medium, for example, at least a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), or any other suitable storage medium. It may be composed of one.
- the memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store a program (program code), a software module, or the like that can be executed to implement the wireless communication method according to the embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, and is, for example, a flexible disc, a floppy (registered trademark) disc, an optical magnetic disc (for example, a compact disc (Compact Disc ROM (CD-ROM)), a digital versatile disc, etc.). At least one of Blu-ray® disks, removable disks, optical disc drives, smart cards, flash memory devices (eg cards, sticks, key drives), magnetic stripes, databases, servers, and other suitable storage media. It may be composed of.
- the storage 1003 may be referred to as 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. in order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)). May be configured to include.
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- the transmission / reception unit 120 (220), the transmission / reception antenna 130 (230), and the like described above may be realized by the communication device 1004.
- the transmission / reception unit 120 (220) may be physically or logically separated from the transmission unit 120a (220a) and the reception unit 120b (220b).
- the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an 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 outputs to the outside.
- the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by the bus 1007 for communicating information.
- the bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.
- the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (Digital Signal Processor (DSP)), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), and the like. It may be configured to include hardware, and a part or all of each functional block may be realized by using the hardware. For example, processor 1001 may be implemented using at least one of these hardware.
- DSP Digital Signal Processor
- ASIC Application Specific Integrated Circuit
- PLD Programmable Logic Device
- FPGA Field Programmable Gate Array
- the terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings.
- channels, symbols and signals may be read interchangeably.
- the signal may be a message.
- the reference signal may be abbreviated as RS, and may be referred to as a pilot, a pilot signal, or the like depending on the applied standard.
- the component carrier Component Carrier (CC)
- CC Component Carrier
- the wireless frame may be composed of one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting the wireless frame may be referred to as a subframe.
- the subframe may be composed of one or more slots in the time domain.
- the subframe may have a fixed time length (eg, 1 ms) that is independent of numerology.
- the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel.
- Numerology includes, for example, subcarrier spacing (SubCarrier Spacing (SCS)), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval (TTI)), number of symbols per TTI, and wireless frame configuration.
- SCS subcarrier Spacing
- TTI Transmission Time Interval
- a specific filtering process performed by the transmitter / receiver in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like may be indicated.
- the slot may be composed of one or more symbols in the time domain (Orthogonal Frequency Division Multiple Access (OFDMA) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.).
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the slot may be a time unit based on numerology.
- the slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain.
- the mini-slot may also be referred to as a sub-slot.
- a minislot may consist of a smaller number of symbols than the slot.
- PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (PUSCH) mapping type A.
- the PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (PUSCH) mapping type B.
- the wireless frame, subframe, slot, minislot and symbol all represent the time unit when transmitting a signal.
- the radio frame, subframe, slot, minislot and symbol may have different names corresponding to each.
- the time units such as frames, subframes, slots, mini slots, and symbols in the present disclosure may be read as each other.
- one subframe may be called TTI
- a plurality of consecutive subframes may be called TTI
- one slot or one minislot may be called TTI. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. It may be.
- the unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.
- TTI refers to, for example, the minimum time unit of scheduling in wireless communication.
- the base station schedules each user terminal to allocate radio resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units.
- the definition of TTI is not limited to this.
- the TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation.
- the time interval for example, the number of symbols
- the transport block, code block, code word, etc. may be shorter than the TTI.
- one or more TTIs may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
- a TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like.
- TTIs shorter than normal TTIs may be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots, and the like.
- the long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.
- a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain.
- the number of subcarriers contained in the RB may be the same regardless of the numerology, and may be, for example, 12.
- the number of subcarriers contained in the RB may be determined based on numerology.
- the RB may include one or more symbols in the time domain, and may have a length of 1 slot, 1 mini slot, 1 subframe or 1 TTI.
- Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.
- One or more RBs are a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, and an RB. It may be called a pair or the like.
- Physical RB Physical RB (PRB)
- SCG sub-carrier Group
- REG resource element group
- the resource block may be composed of one or a plurality of resource elements (Resource Element (RE)).
- RE Resource Element
- 1RE may be a radio resource area of 1 subcarrier and 1 symbol.
- Bandwidth Part (which may also be called partial bandwidth, etc.) represents a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. May be good.
- the common RB may be specified by the index of the RB with respect to the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- the BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL).
- BWP UL BWP
- BWP for DL DL BWP
- One or more BWPs may be set in one carrier for the UE.
- At least one of the configured BWPs may be active, and the UE may not expect to send or receive a given signal / channel outside the active BWP.
- “cell”, “carrier” and the like in this disclosure may be read as “BWP”.
- the above-mentioned structures such as wireless frames, subframes, slots, mini slots, and symbols are merely examples.
- the number of subframes contained in a wireless frame the number of slots per subframe or wireless frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in the RB.
- the number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.
- the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented. For example, radio resources may be indicated by a given index.
- the information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.
- information, signals, etc. can be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layers.
- Information, signals, etc. may be input / output via a plurality of network nodes.
- Input / output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information, signals, etc. 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.
- the notification of information is not limited to the mode / embodiment described in the present disclosure, and may be performed by using another method.
- the notification of information in the present disclosure includes physical layer signaling (for example, downlink control information (DCI)), uplink control information (Uplink Control Information (UCI))), and higher layer signaling (for example, Radio Resource Control). (RRC) signaling, broadcast information (master information block (MIB), system information block (SIB), etc.), medium access control (MAC) signaling), other signals or combinations thereof May be carried out by.
- DCI downlink control information
- UCI Uplink Control Information
- RRC Radio Resource Control
- MIB master information block
- SIB system information block
- MAC medium access control
- the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like.
- the RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like.
- MAC signaling may be notified using, for example, a MAC control element (MAC Control Element (CE)).
- CE MAC Control Element
- the notification of predetermined information is not limited to the explicit notification, but implicitly (for example, by not notifying the predetermined information or another information). May be done (by notification of).
- the determination may be made by a value represented by 1 bit (0 or 1), or by a boolean value represented by true or false. , May be done by numerical comparison (eg, comparison with a given value).
- Software whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module.
- Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- a transmission medium For example, a website where software uses at least one of wired technology (coaxial cable, fiber optic cable, twist pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.).
- wired technology coaxial cable, fiber optic cable, twist pair, digital subscriber line (DSL), etc.
- wireless technology infrared, microwave, etc.
- the terms “system” and “network” used in this disclosure may be used interchangeably.
- the “network” may mean a device (eg, a base station) included in the network.
- precoding "precoding weight”
- QCL Quality of Co-Co-Location
- TCI state Transmission Configuration Indication state
- space "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", “panel” are compatible.
- Base station BS
- radio base station fixed station
- NodeB NodeB
- eNB eNodeB
- gNB gNodeB
- Access point "Transmission point (Transmission Point (TP))
- RP Reception point
- TRP Transmission / Reception Point
- Panel , "Cell”, “sector”, “cell group”, “carrier”, “component carrier” and the like
- Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.
- the base station can accommodate one or more (for example, three) cells.
- a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (Remote Radio)).
- Communication services can also be provided by Head (RRH))).
- RRH Head
- the term "cell” or “sector” refers to part or all of the coverage area of at least one of the base stations and base station subsystems that provide communication services in this coverage.
- MS mobile station
- UE user equipment
- terminal terminal
- Mobile stations include subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals. , Handset, user agent, mobile client, client or some other suitable term.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, or the like.
- At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like.
- the moving body may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving body (for example, a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned type). ) May be.
- at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation.
- at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read by the user terminal.
- the communication between the base station and the user terminal is replaced with the communication between a plurality of user terminals (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
- D2D Device-to-Device
- V2X Vehicle-to-Everything
- Each aspect / embodiment of the present disclosure may be applied to the configuration.
- the user terminal 20 may have the function of the base station 10 described above.
- words such as "up” and “down” may be read as words corresponding to inter-terminal communication (for example, "side”).
- an uplink channel, a downlink channel, and the like may be read as a side channel.
- the user terminal in the present disclosure may be read as a base station.
- the base station 10 may have the functions of the user terminal 20 described above.
- the operation performed by the base station may be performed by its upper node (upper node) in some cases.
- various operations performed for communication with a terminal are performed by the base station and one or more network nodes other than the base station (for example,).
- Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. can be considered, but it is not limited to these), or it is clear that it can be performed by a combination thereof.
- each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution. Further, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- SUPER 3G IMT-Advanced
- 4G 4th generation mobile communication system
- 5G 5th generation mobile communication system
- Future Radio Access FAA
- New-Radio Access Technology RAT
- NR New Radio
- NX New radio access
- Future generation radio access FX
- GSM Global System for Mobile communications
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi (registered trademark)
- IEEE 802.16 WiMAX (registered trademark)
- Ultra-WideBand (UWB), Bluetooth®, other systems utilizing appropriate wireless communication methods, next-generation systems extended based on these, and the like may be applied.
- a plurality of systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).
- references to elements using designations such as “first”, “second”, etc. as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted or that the first element must somehow precede the second element.
- determining used in this disclosure may include a wide variety of actions.
- judgment (decision) means judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry) ( For example, searching in a table, database or another data structure), ascertaining, etc. may be considered to be "judgment”.
- judgment (decision) includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access (for example). It may be regarded as “judgment (decision)” such as “accessing” (for example, accessing data in memory).
- judgment (decision) is regarded as “judgment (decision)” of solving, selecting, selecting, establishing, comparing, and the like. May be good. That is, “judgment (decision)” may be regarded as “judgment (decision)” of some action.
- connection are any direct or indirect connection or connection between two or more elements. Means, and can include the presence of one or more intermediate elements between two elements that are “connected” or “joined” to each other.
- the connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection” may be read as "access”.
- the radio frequency domain microwaves. It can be considered to be “connected” or “coupled” to each other using frequency, electromagnetic energy having wavelengths in the light (both visible and invisible) regions, and the like.
- the term "A and B are different” may mean “A and B are different from each other”.
- the term may mean that "A and B are different from C”.
- Terms such as “separate” and “combined” may be interpreted in the same way as “different”.
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Abstract
Description
NRでは、ビームフォーミングを利用して通信を行うことが検討されている。例えば、UE及び基地局(例えば、gNodeB(gNB))は、信号の送信に用いられるビーム(送信ビーム、Txビームなどともいう)、信号の受信に用いられるビーム(受信ビーム、Rxビームなどともいう)を用いてもよい。
NRでは、基地局は、UEからの要求(スケジューリング要求(Scheduling Request(SR)))に応じて、上りリソース(uplink resource)をUEに割り当てる。なお、上りリソースは、論理上りチャネル(例えば、上り共有チャネル(Uplink Shared Channel(UL-SCH)))用のリソース(UL-SCHリソース)又は、物理上りチャネル(例えば、物理上り共有チャネル(Physical Uplink Shared Channel))用のリソース等と言い換えられてもよい。
・SR設定情報(又はSR設定)の識別子(SR-ID、例えば、RRC IEの「schedulingRequestId」)
・PUCCHでのSR送信用のタイマ(例えば、RRC IEの「sr-ProhibitTimer」)
・SR送信の最大数(例えば、RRC IEの「sr-TransMax」)
・SRリソース情報の識別子(SRリソースID、例えば、RRC IEの「schedulingRequestResourceId」)
・当該SRリソースを用いるSR設定情報(又はSR設定)の識別子(SR-ID、例えば、RRC IEの「schedulingRequestID」)
・SRリソース(SR機会等ともいう)の周期及びオフセットの少なくとも一つを示す情報(周期/オフセット情報、例えば、RRC IEの「periodicityAndOffset」)
・PUCCHリソースの識別子(PUCCHリソースID、例えば、RRC IEの「PUCCH-ResourceId」)
第1の態様では、ビーム障害の発生を通知する第1の情報と、当該ビーム障害を検出したセル及び新候補ビームの少なくとも一つに関する第2の情報を送信する場合のUE動作の一例について説明する。具体的には、第1の情報がトリガされた後に第2の情報の送信を行う場合に、トリガされた第1の情報及び第1の情報の送信に基づいて設定されたタイマーの少なくとも一つをキャンセルする。
図3Bでは、BFR用SRを送信する前にBFR MAC CEを含むMAC PDUを送信する場合にペンディング中のBFR用SR(又は、トリガされたBFR用SR)をキャンセルする場合を示したが、キャンセルするタイミングはこれに限られない。
条件2:ビーム障害が発生したセルにおいて送信コンフィグレーション指標(TCI)状態が変更(又は、アップデート、アクティベート)されるまで
第2の態様では、ビーム障害の発生の通知に利用する第1の情報(以下、BFR用SRと記す)と、他の用途に利用するSR(以下、ノーマルSRと記す)の送信制御の一例について説明する。具体的には、BFR用SRとノーマルSRがトリガされた後に所定情報を含むMAC CE(又は、当該MAC CEを含むMAC PDU)の送信を行う場合に、所定SRのトリガ及びタイマーの少なくとも一つをキャンセルする。
上記説明では、トリガされたBFR用SR(ペンディング中のBFR用SR)及びBFR用SRに関連するタイマーの少なくとも一つは、BSRを含むMAC PDUの送信に関わらず(影響されず)制御する場合を示したがこれに限られない。
第3の態様では、ビーム障害の発生の通知に利用する第1の情報(以下、BFR用SRと記す)と、他の用途に利用するSR(以下、ノーマルSRと記す)の送信制御の他の例について説明する。具体的には、BFR用SRとノーマルSRがトリガされた後にBFR MAC CEとBSRを含むMAC PDUの送信を行う場合に、所定SRのトリガ及びタイマーの少なくとも一つをキャンセルする。
図5では、BFR用SRを送信する前にMAC PDUを送信する場合にペンディング中のBFR用SR(又は、トリガされたBFR用SR)をキャンセルする場合を示したが、キャンセルするタイミングはこれに限られない。
条件2:ビーム障害が発生したセルにおいてTCI状態が変更(又は、アップデート、アクティベート)されるまで
以下、本開示の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、本開示の上記各実施形態に係る無線通信方法のいずれか又はこれらの組み合わせを用いて通信が行われる。
図7は、一実施形態に係る基地局の構成の一例を示す図である。基地局10は、制御部110、送受信部120、送受信アンテナ130及び伝送路インターフェース(transmission line interface)140を備えている。なお、制御部110、送受信部120及び送受信アンテナ130及び伝送路インターフェース140は、それぞれ1つ以上が備えられてもよい。
図8は、一実施形態に係るユーザ端末の構成の一例を示す図である。ユーザ端末20は、制御部210、送受信部220及び送受信アンテナ230を備えている。なお、制御部210、送受信部220及び送受信アンテナ230は、それぞれ1つ以上が備えられてもよい。
なお、上記実施形態の説明に用いたブロック図は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及びソフトウェアの少なくとも一方の任意の組み合わせによって実現される。また、各機能ブロックの実現方法は特に限定されない。すなわち、各機能ブロックは、物理的又は論理的に結合した1つの装置を用いて実現されてもよいし、物理的又は論理的に分離した2つ以上の装置を直接的又は間接的に(例えば、有線、無線などを用いて)接続し、これら複数の装置を用いて実現されてもよい。機能ブロックは、上記1つの装置又は上記複数の装置にソフトウェアを組み合わせて実現されてもよい。
なお、本開示において説明した用語及び本開示の理解に必要な用語については、同一の又は類似する意味を有する用語と置き換えてもよい。例えば、チャネル、シンボル及び信号(シグナル又はシグナリング)は、互いに読み替えられてもよい。また、信号はメッセージであってもよい。参照信号(reference signal)は、RSと略称することもでき、適用される標準によってパイロット(Pilot)、パイロット信号などと呼ばれてもよい。また、コンポーネントキャリア(Component Carrier(CC))は、セル、周波数キャリア、キャリア周波数などと呼ばれてもよい。
Claims (6)
- ビーム障害の発生を通知する第1の情報と、前記ビーム障害を検出したセル及び新候補ビームの少なくとも一つに関する第2の情報を送信する送信部と、
前記第1の情報がトリガされた後に前記第2の情報の送信を行う場合、前記トリガされた第1の情報のキャンセル、及び前記第1の情報の送信に基づいて開始されたタイマーの停止の少なくとも一つを行う制御部と、を有することを特徴とする端末。 - 前記制御部は、前記第2の情報の送信の成功、及び前記ビーム障害が発生したセルの送信コンフィグレーション指標(TCI)状態の変更の少なくとも一方の後に前記トリガされた第1の情報をキャンセルすることを特徴とする請求項1に記載の端末。
- 前記制御部は、前記第1の情報をスケジューリング要求を利用して送信する場合、前記第1の情報に対応する第1のスケジューリング要求と他の情報に対応する第2のスケジューリング要求がトリガされた後に前記他の情報を含むMAC制御情報を送信する場合、前記第1のスケジューリング要求のキャンセル、及び前記第1のスケジューリング要求の送信に基づいて開始されたタイマーの停止の少なくとも一方を行わないように制御することを特徴とする請求項1又は請求項2に記載の端末。
- 前記制御部は、前記第1の情報をスケジューリング要求を利用して送信する場合、前記第1の情報に対応する第1のスケジューリング要求と他の情報に対応する第2のスケジューリング要求がトリガされた後に前記第1の情報及び他の情報を含むMAC制御情報を送信する場合、前記トリガされた第1のスケジューリング要求と第2のスケジューリング要求のキャンセル、及び前記第1のスケジューリング要求の送信に基づいて開始されたタイマー及び前記第2のスケジューリング要求の送信に基づいて開始されたタイマーの停止の少なくとも一方を行うことを特徴とする請求項1又は請求項2に記載の端末。
- 前記制御部は、前記第2の情報の送信の成功、及び前記ビーム障害が発生したセルの送信コンフィグレーション指標(TCI)状態の変更の少なくとも一方の後に前記トリガされた第1のスケジューリング要求をキャンセルすることを特徴とする請求項4に記載の端末。
- ビーム障害の発生を通知する第1の情報と、前記ビーム障害を検出したセル及び新候補ビームの少なくとも一つに関する第2の情報を送信する工程と、
前記第1の情報がトリガされた後に前記第2の情報の送信を行う場合、前記トリガされた第1の情報のキャンセル、及び前記第1の情報の送信に基づいて開始されたタイマーの停止の少なくとも一つを行う工程と、を有することを特徴とする無線通信方法。
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