WO2023002588A1 - Station de base et procédé de communication - Google Patents

Station de base et procédé de communication Download PDF

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Publication number
WO2023002588A1
WO2023002588A1 PCT/JP2021/027222 JP2021027222W WO2023002588A1 WO 2023002588 A1 WO2023002588 A1 WO 2023002588A1 JP 2021027222 W JP2021027222 W JP 2021027222W WO 2023002588 A1 WO2023002588 A1 WO 2023002588A1
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Prior art keywords
cot
lbt
cws
base station
transmission
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PCT/JP2021/027222
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English (en)
Japanese (ja)
Inventor
真由子 岡野
尚哉 芝池
浩樹 原田
チーピン ピ
ジン ワン
ラン チン
依一 ▲盧▼
勇 李
Original Assignee
株式会社Ｎｔｔドコモ
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Application filed by 株式会社Ｎｔｔドコモ filed Critical 株式会社Ｎｔｔドコモ
Priority to PCT/JP2021/027222 priority Critical patent/WO2023002588A1/fr
Publication of WO2023002588A1 publication Critical patent/WO2023002588A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to a base station and communication method in a wireless communication system.
  • Non-Patent Document 2 is considering using a higher frequency band than previous releases (eg, Non-Patent Document 2).
  • a higher frequency band eg., Non-Patent Document 2.
  • applicable numerology including subcarrier spacing, channel bandwidth, etc., physical layer design, possible obstacles in actual wireless communication, etc. are being studied.
  • directional LBT Directional Listen before talk
  • CWS Contention window size
  • the present invention has been made in view of the above points, and can perform LBT (Listen before talk) according to the sensing method in a wireless communication system.
  • a receiving unit that performs directional LBT (Listen before talk), CWS (Contention Window Size) to be applied to the directional LBT, CWS to be applied to the directional LBT, the directional LBT and a controller that determines based on at least one of the sensing beam to apply to and the data transmission beam to apply to the first transmission to be initiated.
  • directional LBT Listen before talk
  • CWS Contention Window Size
  • LBT Listen before talk
  • FIG. 1 is a diagram showing a configuration example of a radio communication system according to an embodiment of the present invention
  • FIG. It is a figure which shows the example of the frequency range in embodiment of this invention. It is a figure for demonstrating the example of LBT.
  • FIG. 4 is a diagram for explaining an example of the hidden terminal problem;
  • FIG. 10 is a flowchart for explaining an example (1) of determining CWS;
  • FIG. 4 is a diagram for explaining an example (1) of a reference period;
  • FIG. 11 is a diagram for explaining an example (2) of a reference period; It is a figure for demonstrating the example of Tw.
  • FIG. 10 is a flowchart for explaining an example (2) of determining CWS;
  • FIG. 4 is a diagram for explaining an example (2) of reference COT determination in the embodiment of the present invention
  • FIG. 10 is a diagram for explaining an example (3) of reference COT determination in the embodiment of the present invention
  • FIG. 10 is a diagram for explaining an example (4) of reference COT determination in the embodiment of the present invention
  • FIG. 10 is a diagram for explaining an example (5) of reference COT determination in the embodiment of the present invention
  • FIG. 10 is a diagram for explaining an example (6) of reference COT determination in the embodiment of the present invention
  • FIG. 11 is a diagram for explaining an example (7) of reference COT determination in the embodiment of the present invention
  • FIG. 11 is a diagram for explaining an example (8) of reference COT determination in the embodiment of the present invention
  • FIG. 10 is a diagram for explaining an example (9) of reference COT determination in the embodiment of the present invention
  • FIG. 4 is a diagram for explaining an example of reference period determination according to the embodiment of the present invention
  • FIG. It is a figure showing an example of functional composition of base station 10 in an embodiment of the invention.
  • 2 is a diagram showing an example of the functional configuration of terminal 20 according to the embodiment of the present invention
  • FIG. 2 is a diagram showing an example of hardware configuration of base station 10 or terminal 20 according to an embodiment of the present invention
  • LTE Long Term Evolution
  • LTE-Advanced LTE-Advanced and subsequent systems (eg, NR) unless otherwise specified.
  • SS Synchronization signal
  • PSS Primary SS
  • SSS Secondary SS
  • PBCH Physical broadcast channel
  • PRACH Physical random access channel
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • the duplex system may be a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, or other (for example, Flexible Duplex etc.) method may be used.
  • TDD Time Division Duplex
  • FDD Frequency Division Duplex
  • "configuring" wireless parameters and the like may mean that predetermined values are preset (Pre-configure), and the base station 10 or A wireless parameter notified from the terminal 20 may be set.
  • FIG. 1 is a diagram showing a configuration example of a wireless communication system according to an embodiment of the present invention.
  • a wireless communication system according to an embodiment of the present invention includes a base station 10 and terminals 20, as shown in FIG. Although one base station 10 and one terminal 20 are shown in FIG. 1, this is an example and there may be more than one.
  • the base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. Physical resources of radio signals are defined in the time domain and the frequency domain. The time domain may be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain is defined by the number of subcarriers or resource blocks. good too.
  • the base station 10 transmits synchronization signals and system information to the terminal 20 . Synchronization signals are, for example, NR-PSS and NR-SSS.
  • the system information is transmitted by, for example, NR-PBCH, and is also called broadcast information.
  • the synchronization signal and system information may be called SSB (SS/PBCH block). As shown in FIG.
  • the base station 10 transmits control signals or data to the terminal 20 on DL (Downlink) and receives control signals or data from the terminal 20 on UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to transmit and receive signals. Also, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output) communication to DL or UL. Also, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) by CA (Carrier Aggregation). Furthermore, the terminal 20 may communicate via a primary cell of the base station 10 and a primary secondary cell group cell (PSCell: Primary SCG Cell) of another base station 10 by DC (Dual Connectivity).
  • SCell Secondary Cell
  • PCell Primary Cell
  • DC Direct Connectivity
  • FIG. 2 is a diagram showing an example of frequency ranges in the embodiment of the present invention.
  • FR Frequency range 1 1
  • SCS Sub carrier spacing
  • the bandwidth is from 5 MHz to 100 MHz.
  • FR2 is the frequency band from 24.25 GHz to 52.6 GHz
  • SCS uses 60, 120 or 240 kHz with a bandwidth of 50 MHz to 400 MHz.
  • the newly operated frequency band may be assumed to range from 52.6 GHz to 71 GHz. Furthermore, it may be envisaged to support frequency bands above 71 GHz.
  • FIG. 3 is a diagram for explaining an example of LBT (Listen Before Talk).
  • LBT Listen Before Talk
  • the Clear Channel Assessment (CCA) procedure defines the channel detection period as 8 microseconds + 5 microseconds times a random counter, as shown in Figure 3. good too.
  • the random counter is 3 in the first LBT
  • the channel busy is detected in the detection period from 14 microseconds to 18 microseconds. example.
  • COT Channel Occupancy Time
  • LBT by other terminals that apply backoff and random counter may be performed, and may be the same as when starting the CCA procedure.
  • LBT by other terminals that do not apply backoff and random counter may be performed, and may be similar to type 2LBT in NR-U.
  • LBT by other terminals may not be performed.
  • directional LBT which applies beams for sensing, may be supported to improve the success rate of LBT.
  • directional LBT is also simply described as LBT.
  • LBT corresponding to COT that applies multiple beams of MU-MIMO (Multi User MIMO) or SDM (Spatial Division Multiplexing) transmission may be supported.
  • COT applying multiple beams may be obtained with a single LBT using a wide sensing beam, or may be obtained with a beam-by-beam LBT.
  • a single LBT that applies a wide beam that covers all the beams used in the COT may be performed with an appropriate power detection threshold, LBT sensing may be performed independently for each beam used in the COT at the start of the COT, or LBT sensing may be performed independently for each beam used in the COT with the addition of Category 2 LBT requirements. It may be executed at the beginning of COT.
  • Category 2 LBT may be LBT without random backoff.
  • FIG. 4 is a diagram for explaining an example of the hidden terminal problem.
  • the detected channel power at the transmitting and receiving nodes for directional LBT may be different.
  • UE1 when the gNB directs a directional LBT beam towards UE1, UE1 is also receiving interfering beams from WLAN nodes that the gNB cannot detect, resulting in a hidden terminal problem at UE1.
  • the receiving node may perform and report legacy RSSI (Received Signal Strength Indicator) measurements. Also, the receiving node may report AP-CSI (Aperiodic Channel state information). Also, the receiving node may perform eCCA (enhanced CCA) or Category 2 LBT.
  • legacy RSSI Receiveived Signal Strength Indicator
  • AP-CSI Aperiodic Channel state information
  • eCCA enhanced CCA
  • Category 2 LBT Category 2 LBT.
  • CWS Contention Window Size
  • NR52.6-71 GHz CWS coordination may be supported to provide a trade-off between overhead and collision probability due to LBT.
  • FIG. 5 is a flowchart for explaining example (1) of determining the CWS.
  • the gNB may maintain a contention window value CWp and adjust CWp as shown in FIG. 5 before performing LBT.
  • CWp contention window value
  • CWp adjust CWp as shown in FIG. 5 before performing LBT.
  • PDSCH may be replaced with "data”.
  • step S11 the gNB determines whether there is valid HARQ feedback since the last CWp update. If valid HARQ feedback exists (YES in S11), proceed to step S12; if valid HARQ feedback does not exist (NO in S11), proceed to step S13.
  • step S12 the gNB determines whether or not it has received at least one ACK corresponding to the PDSCH TB (Transport block) within the reference duration. If at least one ACK has been received (YES in S12), the process proceeds to step S14, and if no ACK has been received (NO in S12), the process proceeds to step S15.
  • the gNB determines whether the transmission does not include retransmissions or is transmitted within Tw. If the transmission does not include retransmissions or is transmitted within Tw (YES in step S13), proceed to step S16; if the transmission includes retransmissions and is not transmitted within Tw (NO in step S13), proceed to step S15. move on.
  • step S14 the gNB sets CWp to the minimum value.
  • step S15 the gNB sets CWp to the next largest allowed value.
  • step S16 the gNB maintains CWp.
  • FIG. 6 is a diagram for explaining example (1) of the reference period.
  • the reference period in step S12 of FIG. 5 may be the reference period shown in FIG.
  • the reference period corresponding to the gNB-initiated COT containing the PDSCH transmission is at least one uni-time period transmitted from the beginning of the COT over all resources allocated for the PDSCH. It may be defined as the period to the end of the first slot of the cast PDSCH.
  • FIG. 7 is a diagram for explaining example (2) of the reference period.
  • the reference period in step S12 of FIG. 5 may be the reference period shown in FIG.
  • the reference period corresponding to the COT initiated by the gNB including the transmission of the PDSCH is the period from the beginning of the COT to the end of the transmission burst containing one or more unicast PDSCHs.
  • the transmission burst may include all PDSCHs transmitted earlier than the end of the transmission burst.
  • the gNB may adjust the CWS as shown in the flowchart of FIG.
  • FIG. 8 is a diagram for explaining an example of Tw.
  • Tw in step S13 of FIG. 5 may be Tw shown in FIG.
  • Tw is a period starting from the end of the reference period, and the length of the period is Ta or Tb+1 ms, whichever is longer.
  • Ta is 5 ms if sharing the channel with other RATs (Radio Access Technology) is not guaranteed for a long period of time, for example as defined by regulations, and 10 ms otherwise.
  • Tb is the period of continuous transmission or the period of a transmission burst starting from the beginning of the reference period.
  • Ta is 5 ms and Tb+1 ms is less than 5 ms, so Tw is Ta. If the LBT for the next transmission is performed within Tw, the value of CWS remains unchanged.
  • FIG. 9 is a flowchart for explaining example (2) of determining the CWS.
  • the UE may coordinate the CWS similarly to the gNB.
  • the UE may execute the flowchart shown in FIG. 5 by replacing PDSCH with PUSCH.
  • HARQ-ACK feedback for one or more PUSCH transmissions is provided to the UE either explicitly or implicitly.
  • Explicit HARQ-ACK feedback is determined based on valid HARQ-ACK feedback from the corresponding CG-DFI (Configured grant Downlink feedback information).
  • Implicit HARQ-ACK feedback is determined based on notification indicating a new transmission or minimum by DCI (Downlink Control Information).
  • step S21 the UE determines whether the CG-DFI has indicated at least one ACK corresponding to the PUSCH TB within the reference period. If the CG-DFI has instructed at least one ACK (YES in S21), the process proceeds to step S22, and if the CG-DFI has not instructed at least one ACK (NO in S21), the process proceeds to step S23.
  • step S22 the UE sets CWp to the minimum value. Meanwhile, in step S23, the UE sets CWp to the next higher allowed value.
  • FIG. 10 is a flowchart for explaining example (3) of determining the CWS.
  • step S31 the UE determines whether or not the NDI (New data indicator) indicates new transmission corresponding to the PUSCH TB within the reference period. If the NDI instructs new transmission (YES in S31), the process proceeds to step S32, and if the NDI does not instruct new transmission (NO in S31), the process proceeds to step S33.
  • NDI New data indicator
  • step S32 the UE sets CWp to the minimum value. Meanwhile, in step S33, the UE sets CWp to the next higher allowed value.
  • the CWS in the directional LBT may be adjusted as in 1) or 2) shown below.
  • CWS adjustment may be commonly performed for all sensing beams (including single LBT). That is, one CWp may be held.
  • Separate CWS adjustments may be performed. That is, multiple CWp may be held. For example, sensing beams and CWp may be mapped one-to-one, and CWp may be retained for each sensing beam. Also, for example, sensing beams and CWp may be mapped many-to-one, and CWp may be retained for each set of sensing beams. The association between sensing beams and CWp may be set by RRC signaling.
  • FIG. 11 is a diagram for explaining example (1) of CWS in the embodiment of the present invention. All sensing beams may be associated with one CWp(2), as shown in FIG.
  • FIG. 12 is a diagram for explaining example (2) of CWS in the embodiment of the present invention. As shown in FIG. 12, for each sensing beam, beam #1 is associated with CWp(1), beam #2 is associated with CWp(2), and beam #3 is associated with CWp(3). CWp may be associated.
  • FIG. 13 is a diagram for explaining example (3) of CWS in the embodiment of the present invention.
  • multiple sensing beams such that beam #1 is associated with CWp(1), beam #2 is associated with CWp(2), and beam #3 is associated with CWp(1). may be associated with one CWp, or one sensing beam may be associated with one CWp.
  • the random backoff counter N in directional LBT may be determined as follows.
  • the random backoff counter N is: A random value from 0 to CWp(i) may be used. If there is no CWp(i) associated with that wide beam, the random backoff counter N may be a random value from 0 to CWp_eff. CWp_eff may be the maximum, minimum, or average of the CWp values associated with multiple beams applying to that COT.
  • the random backoff counter N may be independently determined for each CWp associated with each beam.
  • N1 may be determined as a random value from 0 to CWp(1)
  • N2 may be determined as a random value from 0 to CWp(2).
  • the random backoff counter N may be a random value from 0 to CWp_eff.
  • CWp_eff may be the maximum, minimum, or average of the CWp values associated with multiple beams applying to that COT.
  • the range of values may be further restricted. For example, N may be determined based on the number of beams used for initiating transmissions, or N may be determined based on the number of transmissions to be initiated. For example, the number of beams used for the transmission to be started may be used to determine the minimum value of N.
  • FIG. 14 is a diagram for explaining an example (1) of LBT in the embodiment of the present invention. As shown in FIG. 14, when one beam is used for initiating COT (initiating COT), LBT is performed by applying the beam to sense the leading 8 microseconds and the backoff 5 microseconds. may be
  • FIG. 15 is a diagram for explaining example (2) of LBT in the embodiment of the present invention.
  • 5 microseconds of backoff may be sensed for each beam. That is, a backoff 5 microsecond sensing may be performed a number of times equal to the number of beams.
  • the first 8 microseconds of sensing may be omnidirectional sensing, may be sensing by any beam applied to the COT, or may correspond to some or all of the beams applied to the COT. It may be sensing by a wide beam that If the first 8 microseconds of sensing is sensing by one of the beams applied to COT, the random backoff counter N may have a minimum value of the number of beams applied to COT-1.
  • a procedure for adjusting CWp(i) corresponding to sensing beam #i or beam set Ci may be performed as follows.
  • the "specific transmission beam” may be determined by associating CWp(i) with either the sensing beam of the starting COT or the transmission beam applied to the PDSCH transmitted in the starting COT.
  • the specific transmit beam may be determined in the same manner as the determination of the reference COT, which will be described later.
  • the "specific COT” may be determined by associating CWp(i) with either the sensing beam of the starting COT or the transmission beam applied to the PDSCH transmitted in the starting COT.
  • the specific COT may be determined in the same manner as the determination of the reference COT described below.
  • determination of the reference period may be performed by steps 1 and 2 shown below.
  • the reference COT is determined.
  • the latest COT that satisfies the requirements is determined as the reference COT.
  • the requirements are: CWp(i) of the reference COT, the sensing beam of the reference COT or the transmit beam applied to the PDSCH transmitted in the reference COT, CWp(i) of the starting COT, the sensing beam of the starting COT or starting It is defined based on the association with the transmit beam applied to the PDSCH transmitted on the same COT.
  • FIG. 16 is a diagram for explaining an example of parameter association according to the embodiment of the present invention.
  • the starting COT CWp(i) may be associated with any of the reference COT CWp(i), the sensing beam, and the PDSCH transmit beam.
  • the starting COT sensing beam may be associated with any of the reference COT CWp(i), the sensing beam, and the PDSCH transmission beam.
  • the starting COT PDSCH transmission beam may be associated with any of the reference COT CWp(i), the sensing beam, and the PDSCH transmission beam.
  • the reference COT may be determined based on multiple associations.
  • association of the CWp(i) of the starting COT with the CWp(i) of the reference COT and the association of the sensing beam of the starting COT with the sensing beam of the reference COT define the requirements for determining the reference COT. good too.
  • the association used for defining requirements may be specified by the specification or may be set by RRC signaling.
  • mappings 1)-5 1) CWp(2) is associated with CWp(2) 2) CWp(3) is associated with sensing beam #3 3) CWp(3) is associated with PDSCH transmit beam #3 4) sensing beam #3 is associated with sensing beam #3 5) Sensing beam #3 is associated with PDSCH transmit beam #3
  • RRC signaling may define the following mappings 1)-6) indicating different beam/CWp(i) associations: 1) CWp(2) is associated with CWp(3) 2) CWp(3) is associated with sensing beams #1 and #2 3) CWp(3) is associated with PDSCH transmit beams #1 and #2 Associated 4) Sensing beam #3 is associated with sensing beams #1 and #2 5) Sensing beam #3 is associated with PDSCH transmit beams #1 and #2 6) PDSCH transmit beam #3 is associated with PDSCH transmission associated with beams #1 and #2
  • FIG. 18 is a diagram for explaining an example (2) of reference COT determination according to the embodiment of the present invention.
  • the starting COT CWp(3) may be determined by a mapping associated with the reference COT CWp(2) to the reference COT.
  • FIG. 18 shows an example of different CWp(i) associations.
  • FIG. 19 is a diagram for explaining an example (3) of reference COT determination in the embodiment of the present invention.
  • the starting COT CWp(2) may be determined by a mapping associated with the reference COT CWp(2) to the reference COT.
  • FIG. 20 is a diagram for explaining an example (4) of reference COT determination in the embodiment of the present invention.
  • the starting COT CWp(2) may be determined by a mapping associated with the reference COTs CWp(2) and CWp(3) to determine the reference COT. Since CWp(3) is closer to the starting COT than the COT of CWp(2), the COT of CWp(3) is determined as the reference COT.
  • FIG. 21 is a diagram for explaining an example (5) of reference COT determination according to the embodiment of the present invention.
  • the starting COT sensing beam #2 may be the reference COT determined by the mapping associated with the reference COT sensing beam #2.
  • FIG. 22 is a diagram for explaining an example (6) of reference COT determination according to the embodiment of the present invention.
  • the starting COT sensing beam #2 may be determined by the mapping associated with the reference COT sensing beams #2 and #3 to determine the reference COT. Since the COT of sensing beam #3 is closer to the starting COT than the COT of sensing beam #2, the COT of sensing beam #3 is determined as the reference COT.
  • FIG. 23 is a diagram for explaining an example (7) of reference COT determination in the embodiment of the present invention.
  • the starting COT sensing beam #2 may be determined by the mapping associated with the reference COT PDSCH transmit beam #2 to determine the reference COT.
  • the COT closest to the starting COT is determined as the reference COT.
  • FIG. 24 is a diagram for explaining an example (8) of reference COT determination according to the embodiment of the present invention.
  • the starting COT PDSCH transmit beam #2 may be determined by the mapping associated with the reference COT sensing beams #2 and #3 to determine the reference COT.
  • the COT closest to the starting COT is determined as the reference COT.
  • FIG. 25 is a diagram for explaining an example (9) of reference COT determination in the embodiment of the present invention.
  • starting COT PDSCH transmit beam #1 is associated with reference COT PDSCH transmit beam #1
  • starting COT PDSCH transmit beam #8 is associated with reference COT PDSCH transmit beam #1. 8 may determine the reference COT.
  • the start and end points of the reference period in the reference COT are determined.
  • the starting point of the reference period may be the starting point of the reference COT.
  • the starting point of the reference period may be the starting point of the first PDSCH to which a specific PDSCH transmission beam in the reference COT is applied.
  • a particular PDSCH transmit beam may be associated with a starting COT CWp(i), a sensing beam and/or a PDSCH transmit beam. The association may be similar to the association that determines the reference COT.
  • the end point of the reference period may be the end of the first slot of the PDSCH to which a specific PDSCH transmission beam transmitted on all resources allocated to at least one unicast PDSCH is applied.
  • the end of the reference period is the end of the first transmission burst by the gNB including the PDSCH to which a specific PDSCH transmission beam transmitted on all resources allocated to at least one unicast PDSCH is applied.
  • a specific PDSCH transmission beam may be associated with at least one of CWp(i) included in the starting COT, a sensing beam, and a PDSCH transmission beam. The association may be similar to the association that determines the reference COT.
  • the above-mentioned CWS adjustment in directional LBT by gNB may consider UE assistance information other than HARQ-ACK.
  • the UE assisted information may include information on beams, which may be similar to information in methods applied to UE assisted LBT.
  • the information may be at least one of enhanced RSSI, enhanced CSI reporting, and receiver LBT.
  • CWS coordination may be performed as in 1) or 2) shown below.
  • a common CWS adjustment among multiple beams may be performed based on the information reported for the beams.
  • the reported information for beamset Ci associated with CWp(i) may be used to adjust CWp(i).
  • CWS adjustment may be performed based on the proportion in Ci of beams whose quality is higher or lower than a threshold. Also, for example, CWS adjustment may be performed based on whether the receiver is busy or idle according to the LBT information.
  • CWS coordination may be performed based on both UE assistance information and HARQ-ACK feedback. If new UE assistance information is available since the last CWS adjustment point, the gNB may perform CWS adjustment based on this UE assistance information. If no new UE assistance information is available since the last CWS coordination time and if new HARQ-ACK feedback is available since the last CWS coordination time, the gNB will may perform CWS adjustment.
  • the gNB-side LBT described above may be similarly applied to the UE-side LBT.
  • CWS determination based on notification from gNB may be possible.
  • the notification from the gNB may be via DCI or MAC-CE (Medium Access Control - Control Element).
  • notification from gNB may be notified of the size to adjust the CWS, may be notified directly CWS for LBT.
  • the CWS adjustment method described above may be applicable to a specific frequency band.
  • the CWS tuning method described above may be applicable to FR2-2 from 52.6-71 GHz.
  • a UE capability may be defined that indicates whether the terminal 20 supports CWS adjustment in directional LBT.
  • a UE capability may also be defined that indicates whether or not the terminal 20 supports UE-side behavior corresponding to the behavior of the base station 10 performing CWS coordination in directional LBT.
  • a UE capability may be defined that indicates whether the terminal 20 supports holding only one CWp for all sensing directions.
  • a UE capability may also be defined that indicates whether the terminal 20 supports UE-side operation corresponding to the operation of the base station 10 holding only one CWp for all sensing directions.
  • a UE capability may be defined that indicates whether the terminal 20 supports holding different CWp for different sensing directions and holding multiple CWp. Also, a UE capability may be defined that indicates whether the terminal 20 supports UE-side operation corresponding to the operation of the base station 10 holding different CWp for different sensing directions and holding multiple CWp. .
  • a UE capability may be defined that indicates whether the terminal 20 supports CWS adjustment in directional LBT based on association of at least one of CWp, sensing beams, and PDSCH transmission beams. Also, indicates whether the terminal 20 supports the UE side operation corresponding to the operation of performing CWS adjustment in the directional LBT based on the association of at least one of the CWp, the sensing beam, and the PDSCH transmission beam by the base station 10 UE capabilities may be defined.
  • a UE capability may be defined that indicates whether the terminal 20 supports CWS adjustment based on UE support information in directional LBT.
  • a UE capability may also be defined that indicates whether or not the terminal 20 supports UE-side behavior corresponding to the behavior of the base station 10 performing CWS coordination based on UE assistance information in directional LBT.
  • the base station 10 or the terminal 20 can determine the reference period and perform appropriate CWS adjustment based on the parameters related to the LBT or COT of the transmission to be started in the directional LBT. can.
  • LBT Listen Before Talk
  • the base stations 10 and terminals 20 contain the functionality to implement the embodiments described above. However, each of the base station 10 and the terminal 20 may have only part of the functions in the embodiment.
  • FIG. 27 is a diagram showing an example of the functional configuration of base station 10 according to the embodiment of the present invention.
  • the base station 10 has a transmitting section 110, a receiving section 120, a setting section 130, and a control section 140.
  • the functional configuration shown in FIG. 27 is merely an example. As long as the operation according to the embodiment of the present invention can be executed, the functional division and the names of the functional units may be arbitrary.
  • the transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and wirelessly transmitting the signal.
  • the transmitter 110 also transmits inter-network-node messages to other network nodes.
  • the receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, higher layer information from the received signals. Also, the transmitting unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL/UL control signals, etc. to the terminal 20 .
  • the receiving unit 120 also receives inter-network node messages from other network nodes.
  • the setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 .
  • the content of the setting information is, for example, information related to the setting of LBT.
  • the control unit 140 controls the setting of the LBT as described in the embodiment. Also, the control unit 140 executes scheduling. A functional unit related to signal transmission in control unit 140 may be included in transmitting unit 110 , and a functional unit related to signal reception in control unit 140 may be included in receiving unit 120 .
  • FIG. 28 is a diagram showing an example of the functional configuration of terminal 20 according to the embodiment of the present invention.
  • the terminal 20 has a transmitter 210 , a receiver 220 , a setter 230 and a controller 240 .
  • the functional configuration shown in FIG. 28 is merely an example. As long as the operation according to the embodiment of the present invention can be executed, the functional division and the names of the functional units may be arbitrary.
  • the transmission unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal.
  • the receiving unit 220 wirelessly receives various signals and acquires a higher layer signal from the received physical layer signal. Also, the receiving unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL/UL/SL control signals and the like transmitted from the base station 10 .
  • the transmission unit 210 as D2D communication, to the other terminal 20, PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel) etc.
  • PSCCH Physical Sidelink Control Channel
  • PSSCH Physical Sidelink Shared Channel
  • PSDCH Physical Sidelink Discovery Channel
  • PSBCH Physical Sidelink Broadcast Channel
  • the setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 .
  • the setting unit 230 also stores preset setting information.
  • the content of the setting information is, for example, information related to the setting of LBT.
  • the control unit 240 controls the setting of the LBT, as described in the embodiment.
  • a functional unit related to signal transmission in control unit 240 may be included in transmitting unit 210
  • a functional unit related to signal reception in control unit 240 may be included in receiving unit 220 .
  • each functional block may be implemented using one device that is physically or logically coupled, or directly or indirectly using two or more devices that are physically or logically separated (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices.
  • a functional block may be implemented by combining software in the one device or the plurality of devices.
  • Functions include judging, determining, determining, calculating, calculating, processing, deriving, investigating, searching, checking, receiving, transmitting, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, assuming, Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. can't
  • a functional block (component) that performs transmission is called a transmitting unit or transmitter.
  • the implementation method is not particularly limited.
  • the base station 10, the terminal 20, etc. may function as a computer that performs processing of the wireless communication method of the present disclosure.
  • FIG. 29 is a diagram illustrating an example of a hardware configuration of base station 10 and terminal 20 according to an embodiment of the present disclosure.
  • the base station 10 and terminal 20 described above are physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. good too.
  • the term "apparatus” can be read as a circuit, device, unit, or the like.
  • the hardware configuration of the base station 10 and terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.
  • Each function of the base station 10 and the terminal 20 is performed by the processor 1001 performing calculations and controlling communication by the communication device 1004 by loading predetermined software (programs) onto hardware such as the processor 1001 and the storage device 1002. or by controlling at least one of data reading and writing in the storage device 1002 and the auxiliary storage device 1003 .
  • the processor 1001 for example, operates an operating system and controls the entire computer.
  • the processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like.
  • CPU central processing unit
  • the control unit 140 , the control unit 240 and the like described above may be implemented by the processor 1001 .
  • the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes according to them.
  • programs program codes
  • software modules software modules
  • data etc.
  • the program a program that causes a computer to execute at least part of the operations described in the above embodiments is used.
  • control unit 140 of base station 10 shown in FIG. 27 may be implemented by a control program stored in storage device 1002 and operated by processor 1001 .
  • the control unit 240 of the terminal 20 shown in FIG. 28 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001 .
  • FIG. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via an electric communication line.
  • the storage device 1002 is a computer-readable recording medium, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. may be configured.
  • the storage device 1002 may also be called a register, cache, main memory (main storage device), or the like.
  • the storage device 1002 can store executable programs (program code), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.
  • the auxiliary storage device 1003 is a computer-readable recording medium, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu -ray disk), smart card, flash memory (eg, card, stick, key drive), floppy disk, magnetic strip, and/or the like.
  • the storage medium described above may be, for example, a database, server, or other suitable medium including at least one of storage device 1002 and secondary storage device 1003 .
  • the input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside.
  • the output device 1006 is an output device (for example, display, speaker, LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
  • Each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information.
  • the bus 1007 may be configured using a single bus, or may be configured using different buses between devices.
  • the base station 10 and the terminal 20 include hardware such as microprocessors, digital signal processors (DSPs), ASICs (Application Specific Integrated Circuits), PLDs (Programmable Logic Devices), and FPGAs (Field Programmable Gate Arrays). , and part or all of each functional block may be implemented by the hardware.
  • processor 1001 may be implemented using at least one of these pieces of hardware.
  • the receiving unit that performs directional LBT (Listen before talk) and the CWS (Contention Window Size) applied to the directional LBT are set to the directional
  • a base station comprising a CWS to apply to the LBT, a control unit to determine based on at least one of a sensing beam to apply to the directional LBT and a data transmission beam to apply to the first transmission to be initiated. .
  • LBT Listen before talk
  • the control unit among the COT (Channel Occupancy Time) in the past transmission, the COT to be referred to for determining the CWS to be applied to the first transmission, the CWS to be applied to the LBT, the sensing beam to be applied to the LBT and at least one of data transmission beams to apply to the first transmission.
  • the COT Channel Occupancy Time
  • the CWS to be applied to the LBT the sensing beam to be applied to the LBT and at least one of data transmission beams to apply to the first transmission.
  • At least one of the sensing beam applied to the LBT and the data transmission beam applied to the first transmission, and the CWS applied to the LBT corresponding to the referenced COT, corresponding to the referenced COT At least one of the sensing beam applied to the LBT and the data transmission beam in the referenced COT may be associated.
  • a reference period for identifying the HARQ-ACK feedback to be referred to for determining the CWS to be applied to the first transmission to the data transmission beam to be applied to the first transmission may be determined based on With this configuration, in directional LBT, based on parameters related to the LBT or COT of the transmission to be started, determine a reference period that identifies HARQ-ACK feedback for CWS determination, and perform appropriate CWS adjustment be able to.
  • the control unit may determine the CWS to apply to the directional LBT based on support information other than HARQ-ACK feedback. With this configuration, in directional LBT, appropriate CWS adjustment can be performed based on UE assistance information.
  • LBT Listen before talk
  • the operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components.
  • the processing order may be changed as long as there is no contradiction.
  • the base station 10 and the terminal 20 have been described using functional block diagrams for convenience of explanation of processing, such devices may be implemented in hardware, software, or a combination thereof.
  • the software operated by the processor of the base station 10 according to the embodiment of the present invention and the software operated by the processor of the terminal 20 according to the embodiment of the present invention are stored in random access memory (RAM), flash memory, read-only memory, respectively. (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other appropriate storage medium.
  • notification of information is not limited to the aspects/embodiments described in the present disclosure, and may be performed using other methods.
  • notification of information includes physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof.
  • RRC signaling may also be called an RRC message, for example, RRC It may be a connection setup (RRC Connection Setup) message, an RRC connection reconfiguration message, or the like.
  • Each aspect/embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system) system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark) )), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other suitable systems and extended It may be applied to at least one of the next generation systems. Also, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G, etc.).
  • a specific operation performed by the base station 10 in this specification may be performed by its upper node in some cases.
  • various operations performed for communication with terminal 20 may be performed by base station 10 and other network nodes other than base station 10 (eg, but not limited to MME or S-GW).
  • base station 10 e.g, but not limited to MME or S-GW
  • the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW).
  • Information, signals, etc. described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It may be input and output via multiple network nodes.
  • Input/output information may be stored in a specific location (for example, memory) or managed using a management table. Input/output information and the like can be overwritten, updated, or appended. The output information and the like may be deleted. The entered information and the like may be transmitted to another device.
  • the determination in the present disclosure may be performed by a value represented by 1 bit (0 or 1), may be performed by a boolean value (Boolean: true or false), or may be performed by comparing numerical values (e.g. , comparison with a predetermined value).
  • Software whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.
  • software, instructions, information, etc. may be transmitted and received via a transmission medium.
  • the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.) to website, Wired and/or wireless technologies are included within the definition of transmission medium when sent from a server or other remote source.
  • wired technology coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.
  • wireless technology infrared, microwave, etc.
  • data, instructions, commands, information, signals, bits, symbols, chips, etc. may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of
  • the channel and/or symbols may be signaling.
  • a signal may also be a message.
  • a component carrier may also be called a carrier frequency, a cell, a frequency carrier, or the like.
  • system and “network” used in this disclosure are used interchangeably.
  • information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information.
  • radio resources may be indexed.
  • base station BS
  • radio base station base station
  • base station device fixed station
  • NodeB NodeB
  • eNodeB eNodeB
  • gNodeB gNodeB
  • a base station can accommodate one or more (eg, three) cells.
  • the overall coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being associated with a base station subsystem (e.g., an indoor small base station (RRH:
  • RRH indoor small base station
  • 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 serving communication services in this coverage.
  • MS Mobile Station
  • UE User Equipment
  • At least one of the base station and mobile station may be called a transmitting device, a receiving device, a communication device, or the like.
  • At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like.
  • the mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ).
  • at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations.
  • at least one of the base station and mobile station may be an IoT (Internet of Things) device such as a sensor.
  • IoT Internet of Things
  • judgment and “decision” are considered to be “judgment” and “decision” by resolving, selecting, choosing, establishing, comparing, etc. can contain.
  • judgment and “decision” may include considering that some action is “judgment” and “decision”.
  • judgment (decision) may be read as “assuming”, “expecting”, “considering”, or the like.
  • connection means any direct or indirect connection or coupling between two or more elements, It can include the presence of one or more intermediate elements between two elements being “connected” or “coupled.” Couplings or connections between elements may be physical, logical, or a combination thereof. For example, “connection” may be read as "access”.
  • two elements are defined using at least one of one or more wires, cables, and printed electrical connections and, as some non-limiting and non-exhaustive examples, in the radio frequency domain. , electromagnetic energy having wavelengths in the microwave and optical (both visible and invisible) regions, and the like.
  • the reference signal can also be abbreviated as RS (Reference Signal), and may also be called Pilot depending on the applicable standard.
  • RS Reference Signal
  • a radio frame may consist of one or more frames in the time domain. Each frame or frames in the time domain may be referred to as a subframe. A subframe may also consist of one or more slots in the time domain. A subframe may be of a fixed length of time (eg, 1 ms) independent of numerology.
  • a numerology may be a communication parameter that applies to the transmission and/or reception of a signal or channel. Numerology, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, transceiver It may indicate at least one of certain filtering operations performed in the frequency domain, certain windowing operations performed by the transceiver in the time domain, and/or the like.
  • SCS subcarrier spacing
  • TTI transmission time interval
  • transceiver It may indicate at least one of certain filtering operations performed in the frequency domain, certain windowing operations performed by the transceiver in the time domain, and/or the like.
  • a slot may consist of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time domain.
  • a slot may be a unit of time based on numerology.
  • a slot may contain multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist of fewer symbols than a slot.
  • PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (or PUSCH) mapping type A.
  • PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (or PUSCH) mapping type B.
  • Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations.
  • one subframe may be called a Transmission Time Interval (TTI)
  • TTI Transmission Time Interval
  • TTI Transmission Time Interval
  • TTI Transmission Time Interval
  • one slot or one minislot may be called a TTI.
  • TTI Transmission Time Interval
  • 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 may be Note that the unit representing the TTI may be called a slot, mini-slot, or the like instead of a subframe.
  • TTI refers to, for example, the minimum scheduling time unit in wireless communication.
  • the base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each terminal 20) to each terminal 20 on a TTI basis.
  • radio resources frequency bandwidth, transmission power, etc. that can be used by each terminal 20
  • TTI is not limited to this.
  • a TTI may be a transmission time unit such as a channel-encoded data packet (transport block), code block, or codeword, or may be a processing unit such as scheduling and link adaptation. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.
  • one or more TTIs may be the minimum scheduling time unit. Also, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
  • the long TTI (e.g., normal TTI, subframe, etc.) may be replaced with a TTI having a time length exceeding 1 ms
  • the short TTI e.g., shortened TTI, etc.
  • a TTI having the above TTI length may be read instead.
  • a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain.
  • the number of subcarriers included in the 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.
  • the time domain of an RB may include one or more symbols and may be 1 slot, 1 minislot, 1 subframe, or 1 TTI long.
  • One TTI, one subframe, etc. may each consist of one or more resource blocks.
  • One or more RBs are physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc. may be called.
  • PRBs physical resource blocks
  • SCGs sub-carrier groups
  • REGs resource element groups
  • PRB pairs RB pairs, etc. may be called.
  • a resource block may be composed of one or more resource elements (RE: Resource Element).
  • RE Resource Element
  • 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.
  • the BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP).
  • UL BWP UL BWP
  • DL BWP DL BWP
  • One or multiple BWPs may be configured for a UE within one carrier.
  • At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP.
  • BWP bitmap
  • radio frames, subframes, slots, minislots and symbols described above are only examples.
  • the number of subframes contained in a radio frame the number of slots per subframe or radio frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, the number of Configurations such as the number of subcarriers, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc.
  • CP cyclic prefix
  • a and B are different may mean “A and B are different from each other.”
  • the term may also mean that "A and B are different from C”.
  • Terms such as “separate,” “coupled,” etc. may also be interpreted in the same manner as “different.”
  • notification of predetermined information is not limited to being performed explicitly, but may be performed implicitly (for example, not notifying the predetermined information). good too.
  • base station 110 transmitting unit 120 receiving unit 130 setting unit 140 control unit 20 terminal 210 transmitting unit 220 receiving unit 230 setting unit 240 control unit 1001 processor 1002 storage device 1003 auxiliary storage device 1004 communication device 1005 input device 1006 output device

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Station de base comprenant : une unité de réception pour exécuter une écoute avant de parler (LBT) directionnelle ; et une unité de commande pour déterminer une taille de fenêtre de contention (CWS) à appliquer à la LBT directionnelle sur la base d'une CWS à appliquer à la LBT directionnelle, et/ou d'un faisceau de détection à appliquer à la LBT directionnelle, et/ou d'un faisceau de transmission de données à appliquer à une première transmission à démarrer.
PCT/JP2021/027222 2021-07-20 2021-07-20 Station de base et procédé de communication WO2023002588A1 (fr)

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Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
LENOVO, MOTOROLA MOBILITY: "Channel access mechanisms for NR from 52.6 GHz to 71GHz", 3GPP DRAFT; R1-2105498, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-meeting; 20210510 - 20210527, 11 May 2021 (2021-05-11), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP052006389 *
LG ELECTRONICS: "Considerations on channel access mechanism to support NR above 52.6 GHz", 3GPP DRAFT; R1-2105423, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210510 - 20210527, 12 May 2021 (2021-05-12), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP052011436 *

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