WO2022203390A1 - Drx 동작을 지원하는 사이드링크 통신에서 자원 센싱 및 선택을 위한 방법 및 장치 - Google Patents
Drx 동작을 지원하는 사이드링크 통신에서 자원 센싱 및 선택을 위한 방법 및 장치 Download PDFInfo
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- 238000004891 communication Methods 0.000 title claims abstract description 245
- 238000000034 method Methods 0.000 title claims abstract description 141
- 230000005540 biological transmission Effects 0.000 claims abstract description 46
- 238000011017 operating method Methods 0.000 claims abstract 6
- 230000011664 signaling Effects 0.000 claims description 42
- 238000005516 engineering process Methods 0.000 description 59
- 230000010267 cellular communication Effects 0.000 description 23
- 238000010586 diagram Methods 0.000 description 22
- 230000006870 function Effects 0.000 description 14
- 230000002457 bidirectional effect Effects 0.000 description 5
- 238000007726 management method Methods 0.000 description 3
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- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
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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
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/18—Interfaces between hierarchically similar devices between terminal devices
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/40—Resource management for direct mode communication, e.g. D2D or sidelink
Definitions
- the present invention relates to a sidelink communication technology, and more particularly, to a resource sensing and selection technology in sidelink communication supporting a discontinuous reception (DRX) operation.
- DRX discontinuous reception
- 4G (4th Generation) communication system e.g., LTE (Long Term Evolution) communication system, LTE-A (Advanced) communication system
- LTE Long Term Evolution
- LTE-A Advanced
- the 5G communication system may support enhanced Mobile BroadBand (eMBB), Ultra-Reliable and Low Latency Communication (URLLC), and massive Machine Type Communication (mMTC).
- eMBB enhanced Mobile BroadBand
- URLLC Ultra-Reliable and Low Latency Communication
- mMTC massive Machine Type Communication
- the 4G communication system and the 5G communication system may support vehicle to everything (V2X) communication (eg, sidelink communication).
- V2X communication supported in a cellular communication system such as a 4G communication system and a 5G communication system, may be referred to as "C-V2X (Cellular-Vehicle to Everything) communication”.
- V2X communication (eg, C-V2X communication) may include Vehicle to Vehicle (V2V) communication, Vehicle to Infrastructure (V2I) communication, Vehicle to Pedestrian (V2P) communication, Vehicle to Network (V2N) communication, etc. .
- V2X communication (eg, C-V2X communication) in a cellular communication system is a sidelink (sidelink) communication technology (eg, ProSe (Proximity based Services) communication technology, D2D (Device to Device) communication technology) based on can be performed.
- sidelink for vehicles participating in V2V communication (eg, sidelink communication) may be established, and communication between vehicles may be performed using the sidelink channel.
- Sidelink communication may be performed using configured grant (CG) resources.
- CG resources may be periodically configured, and periodic data (eg, periodic sidelink data) may be transmitted using the CG resources.
- sidelink communication may support a discontinuous reception (DRX) operation.
- DRX discontinuous reception
- resource sensing and selection operation in consideration of the DRX operation may be required.
- the DRX operation needs to be set in consideration of the resource sensing period and/or the resource selection period.
- An object of the present invention for solving the above problems is to provide a method and an apparatus for resource sensing and selection in sidelink communication supporting a discontinuous reception (DRX) operation.
- DRX discontinuous reception
- a method of operating a first terminal includes performing a resource sensing operation in consideration of a DRX cycle of a second terminal performing a DRX operation, and ON within the DRX cycle. - performing a resource selection operation based on a result of the resource sensing operation in a duration period, and performing sidelink communication with the second terminal using the transmission resources selected by the resource selection operation.
- the on-duration period of the second terminal that exists after the end of the resource sensing window in which the resource sensing operation is performed may be set as the resource selection window in which the resource selection operation is performed.
- the resource sensing operation may be additionally performed.
- the resource sensing operation may be performed in one or more on-duration intervals set in the second terminal, and the length of the one or more on-duration intervals does not exceed the length of the resource sensing window set for the resource sensing operation.
- the resource sensing window in which the resource sensing operation is performed may include n on-duration intervals configured in the second terminal, and the resource sensing operation may be performed in the n on-duration intervals, where n is It may be a natural number.
- the performing of the resource sensing operation includes: performing the resource sensing operation in a first resource sensing window; and when the congestion degree in the first resource sensing window is equal to or greater than a threshold value, the resource after the first resource sensing window It may include the step of re-performing the sensing operation.
- the re-performing operation of the resource sensing operation may be performed as many times as the maximum number of retransmissions, and the maximum number of retransmissions may be set by higher layer signaling.
- the resource selection operation may be performed after the resource sensing operation.
- a method of operating a first terminal according to a second embodiment of the present invention for achieving the above object includes performing a resource sensing operation in consideration of the DRX cycle of the first terminal performing the DRX operation, within the DRX cycle performing a resource selection operation based on a result of the resource sensing operation in an on-duration interval, and performing sidelink communication with a second terminal using the transmission resources selected by the resource selection operation.
- the resource sensing operation may be performed in one or more on-duration intervals set in the first terminal, and the length of the one or more on-duration intervals may not exceed a resource sensing window configured for the resource sensing operation. .
- the resource sensing window in which the resource sensing operation is performed may include n on-duration intervals configured in the first terminal, and the resource sensing operation may be performed in the n on-duration intervals, where n is It may be a natural number.
- the performing of the resource sensing operation includes: performing the resource sensing operation in a first resource sensing window; and when the congestion degree in the first resource sensing window is equal to or greater than a threshold value, the resource after the first resource sensing window It may include the step of re-performing the sensing operation.
- the re-performation of the resource sensing operation may be performed as many times as the maximum number of retransmissions, and the threshold value may be changed according to the re-performation of the resource sensing operation.
- the resource sensing operation may be stopped, and the specific time interval may be configured to be related to the DRX cycle.
- a method of operating a first terminal according to a third embodiment of the present invention for achieving the above object includes: performing a resource sensing operation in consideration of the DRX cycle of the first terminal performing the DRX operation, the first terminal performing a resource selection operation based on the result of the resource sensing operation in an overlapping interval between the on-duration interval set in and the on-duration interval set in the second terminal, and using the transmission resources selected by the resource selection operation and performing sidelink communication with the second terminal.
- the first terminal may perform a function of a transmitting terminal in the sidelink communication with the second terminal, and the first terminal may perform a function of a receiving terminal based on DRX configuration information in sidelink communication with a third terminal can be performed.
- the resource sensing operation may be performed in a resource sensing window configured for the first terminal, and the resource sensing operation may be additionally performed in a period from an end time of the resource sensing window to a start time of the overlapping interval.
- the performing of the resource sensing operation includes: performing the resource sensing operation in a first resource sensing window; and when the congestion degree in the first resource sensing window is equal to or greater than a threshold value, the resource after the first resource sensing window It may include the step of re-performing the sensing operation.
- the operation of re-performing the resource sensing operation may be performed as many times as the maximum number of retransmissions, the maximum number of retransmissions may be set by higher layer signaling, and the threshold value is changed according to the number of times of re-performing the resource sensing operation can be
- the resource sensing operation may be stopped, and the specific time interval may be configured to be related to the DRX cycle.
- a first terminal may perform a resource sensing operation in consideration of a discontinuous reception (DRX) cycle configured in the first terminal or a DRX cycle configured in the second terminal, and a DRX cycle.
- a resource selection operation may be performed on the basis of the result of the resource sensing operation in an on-duration interval according to .
- the first terminal may perform sidelink communication with the second terminal using the transmission resources selected by the resource selection operation. Accordingly, in the sidelink communication supporting the DRX operation, the resource sensing/selection operation may be efficiently performed, and the performance of the communication system may be improved.
- 1 is a conceptual diagram illustrating scenarios of V2X communication.
- FIG. 2 is a conceptual diagram illustrating a first embodiment of a cellular communication system.
- FIG. 3 is a block diagram illustrating a first embodiment of a communication node constituting a cellular communication system.
- FIG. 4 is a block diagram illustrating a first embodiment of a user plane protocol stack of a UE performing sidelink communication.
- FIG. 5 is a block diagram illustrating a first embodiment of a control plane protocol stack of a UE performing sidelink communication.
- FIG. 6 is a block diagram illustrating a second embodiment of a control plane protocol stack of a UE performing sidelink communication.
- FIG. 7 is a conceptual diagram illustrating a first embodiment of sidelink communication supporting a DRX operation.
- FIG. 8 is a conceptual diagram illustrating a second embodiment of sidelink communication supporting a DRX operation.
- FIG. 9 is a conceptual diagram illustrating a third embodiment of sidelink communication supporting a DRX operation.
- FIG. 10 is a conceptual diagram illustrating a fourth embodiment of sidelink communication supporting a DRX operation.
- 11 is a conceptual diagram illustrating a DRX operation mode applicable to sidelink communication.
- first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.
- the term “and/or” includes a combination of a plurality of related listed items or any of a plurality of related listed items.
- “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B”. Also, in the embodiments of the present application, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B”.
- (re)transmission may mean “transmission”, “retransmission”, or “transmission and retransmission”
- (re)setup is “setup”, “reset”, or “set and may mean “reset”
- (re)connection may mean “connection”, “reconnection”, or “connection and reconnection”
- (re)connection means “connection”, “reconnection”, or “ connection and reconnection”.
- V2X Vehicle to Everything
- V2X communication may include Vehicle to Vehicle (V2V) communication, Vehicle to Infrastructure (V2I) communication, Vehicle to Pedestrian (V2P) communication, Vehicle to Network (V2N) communication, and the like.
- V2X communication may be supported by the cellular communication system (eg, cellular communication network) 140
- V2X communication supported by the cellular communication system 140 is "C-V2X (Cellular-Vehicle to everything) communication" " can be referred to as Cellular communication system 140 is a 4G (4th Generation) communication system (eg, LTE (Long Term Evolution) communication system, LTE-A (Advanced) communication system), 5G (5th Generation) communication system (eg, NR (New Radio) communication system) and the like.
- 4G (4th Generation) communication system eg, LTE (Long Term Evolution) communication system, LTE-A (Advanced) communication system
- 5G (5th Generation) communication system eg, NR (New Radio) communication system
- V2V communication is communication between vehicle #1(100) (eg, a communication node located at vehicle #1(100)) and vehicle #2(110) (eg, a communication node located at vehicle #1(100)).
- Driving information eg, velocity, heading, time, position, etc.
- autonomous driving eg, platooning
- V2V communication supported by the cellular communication system 140 may be performed based on a sidelink communication technology (eg, Proximity based Services (ProSe) communication technology, Device to Device (D2D) communication technology).
- sidelink communication technology eg, Proximity based Services (ProSe) communication technology, Device to Device (D2D) communication technology.
- communication between the vehicles 100 and 110 may be performed using a sidelink channel.
- V2I communication may mean communication between the vehicle #1 100 and an infrastructure (eg, a road side unit (RSU)) 120 located on a roadside.
- the infrastructure 120 may be a traffic light or a street light located on a roadside.
- V2I communication when V2I communication is performed, communication may be performed between a communication node located at vehicle #1 ( 100 ) and a communication node located at a traffic light. Driving information, traffic information, and the like may be exchanged between the vehicle #1 100 and the infrastructure 120 through V2I communication.
- V2I communication supported by the cellular communication system 140 may be performed based on a sidelink communication technology (eg, ProSe communication technology, D2D communication technology). In this case, communication between the vehicle #1 100 and the infrastructure 120 may be performed using a sidelink channel.
- a sidelink communication technology eg, ProSe communication technology, D2D communication technology
- V2P communication may mean communication between vehicle #1 ( 100 ) (eg, a communication node located in vehicle #1 ( 100 )) and person 130 (eg, a communication node possessed by person 130 ).
- vehicle #1 ( 100 ) eg, a communication node located in vehicle #1 ( 100 )
- person 130 eg, a communication node possessed by person 130
- driving information of vehicle #1 ( 100 ) and movement information (eg, speed, direction, time, location, etc.) of vehicle #1 ( 100 ) and person 130 are exchanged between vehicle #1 ( 100 ) and person 130 through V2P communication.
- the communication node located in vehicle #1 100 or the communication node possessed by the person 130 may generate an alarm indicating danger by determining a dangerous situation based on the acquired driving information and movement information. .
- V2P communication supported by the cellular communication system 140 may be performed based on a sidelink communication technology (eg, ProSe communication technology, D2D communication technology).
- a sidelink communication technology eg, ProSe communication technology, D2D communication technology.
- communication between the communication node located in the vehicle #1 100 or the communication node possessed by the person 130 may be performed using a sidelink channel.
- V2N communication may refer to communication between vehicle #1 100 (eg, a communication node located in vehicle #1 100 ) and a cellular communication system (eg, cellular communication network) 140 .
- V2N communication may be performed based on 4G communication technology (eg, LTE communication technology and LTE-A communication technology specified in 3GPP standard), 5G communication technology (eg, NR communication technology specified in 3GPP standard), etc. have.
- 4G communication technology eg, LTE communication technology and LTE-A communication technology specified in 3GPP standard
- 5G communication technology eg, NR communication technology specified in 3GPP standard
- V2N communication is a communication technology defined in the IEEE (Institute of Electrical and Electronics Engineers) 702.11 standard (eg, WAVE (Wireless Access in Vehicular Environments) communication technology, WLAN (Wireless Local Area Network) communication technology, etc.), IEEE It may be performed based on a communication technology (eg, wireless personal area network (WPAN), etc.) specified in the 702.15 standard.
- IEEE Institute of Electrical and Electronics Engineers 702.11 standard
- WAVE Wireless Access in Vehicular Environments
- WLAN Wireless Local Area Network
- the cellular communication system 140 supporting V2X communication may be configured as follows.
- FIG. 2 is a conceptual diagram illustrating a first embodiment of a cellular communication system.
- the cellular communication system may include an access network, a core network, and the like.
- the access network may include a base station 210 , a relay 220 , User Equipment (UE) 231 to 236 , and the like.
- UEs 231 to 236 may be communication nodes located in vehicles 100 and 110 of FIG. 1 , communication nodes located in infrastructure 120 of FIG. 1 , communication nodes carried by person 130 of FIG. 1 , and the like.
- the core network is a serving-gateway (S-GW) 250, a packet data network (PDN)-gateway (P-GW) 260, and a mobility management entity (MME). (270) and the like.
- S-GW serving-gateway
- PDN packet data network
- P-GW packet data network
- MME mobility management entity
- the core network may include a user plane function (UPF) 250, a session management function (SMF) 260, an access and mobility management function (AMF) 270, and the like.
- UPF user plane function
- SMF session management function
- AMF access and mobility management function
- the core network including the S-GW 250 , the P-GW 260 , the MME 270 , etc. is a 4G communication technology as well as a 5G communication technology
- the core network including the UPF 250 , the SMF 260 , and the AMF 270 may support not only 5G communication technology but also 4G communication technology.
- the core network may be divided into a plurality of logical network slices.
- a network slice that supports V2X communication eg, V2V network slice, V2I network slice, V2P network slice, V2N network slice, etc.
- V2X communication is in the V2X network slice set in the core network.
- Communication nodes constituting the cellular communication system are CDMA (code division multiple access) technology, WCDMA (wideband) CDMA) technology, TDMA (time division multiple access) technology, FDMA (frequency division multiple access) technology, OFDM (orthogonal frequency division multiplexing) technology, Filtered OFDM technology, OFDMA (orthogonal frequency division multiple access) technology, SC (single carrier) technology -FDMA technology, NOMA (Non-orthogonal Multiple Access) technology, GFDM (generalized frequency division multiplexing) technology, FBMC (filter bank multi-carrier) technology, UFMC (universal filtered multi-carrier) technology, and SDMA (Space Division Multiple Access) technology ) technology, communication may be performed using at least one communication technology.
- CDMA code division multiple access
- WCDMA wideband CDMA
- TDMA time division multiple access
- FDMA frequency division multiple access
- OFDM orthogonal frequency division multiplexing
- Filtered OFDM technology OFDMA (orthogonal frequency division multiple access
- Communication nodes eg, base station, relay, UE, S-GW, P-GW, MME, UPF, SMF, AMF, etc.
- Communication nodes constituting the cellular communication system may be configured as follows.
- FIG. 3 is a block diagram illustrating a first embodiment of a communication node constituting a cellular communication system.
- the communication node 300 may include at least one processor 310 , a memory 320 , and a transceiver 330 connected to a network to perform communication.
- the communication node 300 may further include an input interface device 340 , an output interface device 350 , a storage device 360 , and the like.
- Each of the components included in the communication node 300 may be connected by a bus 370 to communicate with each other.
- each of the components included in the communication node 300 may not be connected to the common bus 370 but to the processor 310 through an individual interface or an individual bus.
- the processor 310 may be connected to at least one of the memory 320 , the transceiver 330 , the input interface device 340 , the output interface device 350 , and the storage device 360 through a dedicated interface. .
- the processor 310 may execute a program command stored in at least one of the memory 320 and the storage device 360 .
- the processor 310 may mean a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present invention are performed.
- Each of the memory 320 and the storage device 360 may be configured as at least one of a volatile storage medium and a non-volatile storage medium.
- the memory 320 may be configured as at least one of a read only memory (ROM) and a random access memory (RAM).
- the base station 210 may form a macro cell or a small cell, and may be connected to the core network through an ideal backhaul or a non-ideal backhaul.
- the base station 210 may transmit a signal received from the core network to the UEs 231 to 236 and the relay 220, and may transmit a signal received from the UEs 231 to 236 and the relay 220 to the core network.
- UEs #1, #2, #4, #5, and #6 (231 , 232 , 234 , 235 , 236 ) may belong to cell coverage of the base station 210 .
- UEs #1, #2, #4, #5, and #6 may be connected to the base station 210 by performing a connection establishment procedure with the base station 210. .
- UEs #1, #2, #4, #5, and #6 ( 231 , 232 , 234 , 235 , 236 ) may communicate with the base station 210 after being connected to the base station 210 .
- the relay 220 may be connected to the base station 210 and may relay communication between the base station 210 and UEs #3 and #4 (233, 234).
- the relay 220 may transmit the signal received from the base station 210 to the UEs #3 and #4 (233, 234), and transmit the signal received from the UEs #3 and #4 (233, 234) to the base station 210.
- can be sent to UE #4 234 may belong to the cell coverage of the base station 210 and the cell coverage of the relay 220
- UE #3 233 may belong to the cell coverage of the relay 220 . That is, UE #3 233 may be located outside the cell coverage of the base station 210 .
- UEs #3 and #4 may be connected to the relay 220 by performing a connection establishment procedure with the relay 220 .
- UEs #3 and #4 may communicate with the relay 220 after being connected to the relay 220 .
- the base station 210 and the relay 220 are MIMO (eg, single user (SU)-MIMO, multi user (MU)-MIMO, massive MIMO, etc.) communication technology, CoMP (coordinated multipoint) communication technology, CA (Carrier Aggregation) communication technology, unlicensed band communication technology (eg, Licensed Assisted Access (LAA), enhanced LAA (eLAA)), sidelink communication technology (eg, ProSe communication technology, D2D communication) technology), etc.
- UEs #1, #2, #5, and #6 (231 , 232 , 235 , 236 ) may perform operations corresponding to the base station 210 , operations supported by the base station 210 , and the like.
- UEs #3 and #4 (233, 234) may perform an operation corresponding to the relay 220, an operation supported by the relay 220, and the like.
- the base station 210 is a NodeB (NodeB), an advanced NodeB (evolved NodeB), a base transceiver station (BTS), a radio remote head (RRH), a transmission reception point (TRP), a radio unit (RU), an RSU ( road side unit), a wireless transceiver (radio transceiver), an access point (access point), may be referred to as an access node (node).
- the relay 220 may be referred to as a small base station, a relay node, or the like.
- the UEs 231 to 236 are a terminal, an access terminal, a mobile terminal, a station, a subscriber station, a mobile station, a portable subscriber station. subscriber station), a node, a device, an on-broad unit (OBU), and the like.
- communication between the UE #5 235 and the UE #6 236 may be performed based on a Cylink communication technology (eg, a ProSe communication technology, a D2D communication technology).
- the sidelink communication may be performed based on a one-to-one scheme or a one-to-many scheme.
- UE #5 235 may indicate a communication node located in vehicle #1 100 of FIG. 1
- UE #6 236 of FIG. 1 It may indicate a communication node located in vehicle #2 110 .
- UE #5 235 may indicate a communication node located in vehicle #1 100 of FIG.
- UE #5 235 may indicate a communication node located in vehicle #1 100 of FIG. 1 , and UE #6 236 of FIG. 1 . It may indicate the communication node possessed by the person 130 .
- Scenarios to which sidelink communication is applied may be classified as shown in Table 1 below according to the locations of UEs (eg, UE #5 235 and UE #6 236) participating in sidelink communication.
- UEs eg, UE #5 235 and UE #6 2366
- the scenario for sidelink communication between UE #5 235 and UE #6 236 shown in FIG. 2 may be sidelink communication scenario #C.
- a user plane protocol stack of UEs performing sidelink communication (eg, UE #5 (235), UE #6 (236)) may be configured as follows.
- FIG. 4 is a block diagram illustrating a first embodiment of a user plane protocol stack of a UE performing sidelink communication.
- UE #5 235 may be UE #5 235 illustrated in FIG. 2
- UE #6 236 may be UE #6 236 illustrated in FIG. 2
- a scenario for sidelink communication between UE #5 235 and UE #6 236 may be one of sidelink communication scenarios #A to #D in Table 1.
- the user plane protocol stacks of UE #5 (235) and UE #6 (236) respectively include a Physical (PHY) layer, a Medium Access Control (MAC) layer, a Radio Link Control (RLC) layer, and a Packet Data Convergence Protocol (PDCP) layer. and the like.
- PHY Physical
- MAC Medium Access Control
- RLC Radio Link Control
- PDCP Packet Data Convergence Protocol
- Layer 2-ID identifier
- layer 2-ID is set for V2X communication It may be an ID.
- HARQ hybrid automatic repeat request
- RLC AM Acknowledged Mode
- RLC UM Unacknowledged Mode
- a control plane protocol stack of UEs performing sidelink communication (eg, UE #5 (235), UE #6 (236)) may be configured as follows.
- FIG. 5 is a block diagram illustrating a first embodiment of a control plane protocol stack of a UE performing sidelink communication
- FIG. 6 is a second embodiment of a control plane protocol stack of a UE performing sidelink communication. It is a block diagram.
- UE #5 235 may be UE #5 235 illustrated in FIG. 2
- UE #6 236 may be UE #6 236 illustrated in FIG. 2
- a scenario for sidelink communication between UE #5 235 and UE #6 236 may be one of sidelink communication scenarios #A to #D in Table 1.
- the control plane protocol stack shown in FIG. 5 may be a control plane protocol stack for transmission and reception of broadcast information (eg, Physical Sidelink Broadcast Channel (PSBCH)).
- PSBCH Physical Sidelink Broadcast Channel
- the control plane protocol stack shown in FIG. 5 may include a PHY layer, a MAC layer, an RLC layer, a radio resource control (RRC) layer, and the like. Sidelink communication between UE #5 235 and UE #6 236 may be performed using a PC5 interface (eg, a PC5-C interface).
- the control plane protocol stack shown in FIG. 6 may be a control plane protocol stack for sidelink communication in a one-to-one manner.
- the control plane protocol stack shown in FIG. 6 may include a PHY layer, a MAC layer, an RLC layer, a PDCP layer, a PC5 signaling protocol layer, and the like.
- the channel used in sidelink communication between UE #5 (235) and UE #6 (236) is PSSCH (Physical Sidelink Shared Channel), PSCCH (Physical Sidelink Control Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH ( Physical Sidelink Broadcast Channel) and the like.
- the PSSCH may be used for transmission and reception of sidelink data, and may be configured in a UE (eg, UE #5 (235), UE #6 (236)) by higher layer signaling.
- the PSCCH may be used for transmission and reception of sidelink control information (SCI), and may be configured in the UE (eg, UE #5 (235), UE #6 (236)) by higher layer signaling.
- SCI sidelink control information
- PSDCH may be used for the discovery procedure.
- the discovery signal may be transmitted through PSDCH.
- PSBCH may be used for transmission and reception of broadcast information (eg, system information).
- DMRS demodulation reference signal
- a synchronization signal and the like may be used in sidelink communication between the UE #5 235 and the UE #6 236 .
- the synchronization signal may include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS).
- PSSS primary sidelink synchronization signal
- SSSS secondary sidelink synchronization signal
- a sidelink transmission mode may be classified into sidelink TMs #1 to #4 as shown in Table 2 below.
- each of UE #5 (235) and UE #6 (236) performs sidelink communication using a resource pool set by the base station 210.
- a resource pool may be configured for each sidelink control information or sidelink data.
- a resource pool for sidelink control information may be configured based on an RRC signaling procedure (eg, a dedicated RRC signaling procedure, a broadcast RRC signaling procedure).
- a resource pool used for reception of sidelink control information may be set by a broadcast RRC signaling procedure.
- a resource pool used for transmission of sidelink control information may be set by a dedicated RRC signaling procedure.
- the sidelink control information may be transmitted through a resource scheduled by the base station 210 within the resource pool set by the dedicated RRC signaling procedure.
- a resource pool used for transmission of sidelink control information may be set by a dedicated RRC signaling procedure or a broadcast RRC signaling procedure.
- the sidelink control information is autonomously selected by the UE (eg, UE #5 (235), UE #6 (236)) within the resource pool set by the dedicated RRC signaling procedure or the broadcast RRC signaling procedure. It may be transmitted through a resource.
- a resource pool for transmission and reception of sidelink data may not be set.
- sidelink data may be transmitted/received through a resource scheduled by the base station 210 .
- a resource pool for transmission and reception of sidelink data may be set by a dedicated RRC signaling procedure or a broadcast RRC signaling procedure.
- the sidelink data is the resource autonomously selected by the UE (eg, UE #5 (235), UE #6 (236)) within the resource pool set by the RRC signaling procedure or the broadcast RRC signaling procedure. can be transmitted and received through
- a second communication node corresponding thereto is a method (eg, a method corresponding to the method performed in the first communication node) For example, reception or transmission of a signal) may be performed. That is, when the operation of UE #1 (eg, vehicle #1) is described, the corresponding UE #2 (eg, vehicle #2) may perform an operation corresponding to that of UE #1. have. Conversely, when the operation of UE #2 is described, the corresponding UE #1 may perform the operation corresponding to the operation of UE #2. In the embodiments described below, the operation of the vehicle may be that of a communication node located in the vehicle.
- signaling may be one or a combination of two or more of higher layer signaling, MAC signaling, and PHY (physical) signaling.
- a message used for higher layer signaling may be referred to as an "upper layer message” or a “higher layer signaling message”.
- a message used for MAC signaling may be referred to as a “MAC message” or a “MAC signaling message”.
- a message used for PHY signaling may be referred to as a “PHY message” or a “PHY signaling message”.
- Higher layer signaling may refer to an operation of transmitting and receiving system information (eg, a master information block (MIB), a system information block (SIB)) and/or an RRC message.
- MIB master information block
- SIB system information block
- MAC signaling may refer to a transmission/reception operation of a MAC control element (CE).
- PHY signaling may refer to a transmission/reception operation of control information (eg, downlink control information (DCI), uplink control information (UCI), and SCI).
- DCI downlink control information
- UCI uplink control information
- SCI SCI
- the sidelink signal may be a synchronization signal and a reference signal used for sidelink communication.
- the synchronization signal may be a synchronization signal/physical broadcast channel (SS/PBCH) block, a sidelink synchronization signal (SLSS), a primary sidelink synchronization signal (PSSS), a secondary sidelink synchronization signal (SSSS), and the like.
- the reference signal is a channel state information-reference signal (CSI-RS), DMRS, phase tracking-reference signal (PT-RS), cell specific reference signal (CRS), sounding reference signal (SRS), discovery reference signal (DRS), etc.
- CSI-RS channel state information-reference signal
- DMRS channel state information-reference signal
- PT-RS phase tracking-reference signal
- CRS cell specific reference signal
- SRS sounding reference signal
- DRS discovery reference signal
- the sidelink channel may be PSSCH, PSCCH, PSDCH, PSBCH, physical sidelink feedback channel (PSFCH), or the like.
- the sidelink channel may mean a sidelink channel including a sidelink signal mapped to specific resources in the corresponding sidelink channel.
- the sidelink communication may support a broadcast service, a multicast service, a groupcast service, and a unicast service.
- the sidelink communication may be performed based on a single SCI scheme or a multi-SCI scheme.
- data transmission eg, sidelink data transmission, SL-SCH (sidelink-shared channel) transmission
- one SCI eg, 1 st -stage SCI
- data transmission may be performed using two SCIs (eg, 1 st -stage SCI and 2 nd -stage SCI).
- SCI may be transmitted through PSCCH and/or PSSCH.
- the SCI (eg, 1 st -stage SCI) may be transmitted in the PSCCH.
- 1 st -stage SCI may be transmitted on PSCCH
- 2 nd -stage SCI may be transmitted on PSCCH or PSSCH.
- 1 st -stage SCI may be referred to as "first stage SCI”
- 2 nd -stage SCI may be referred to as "second stage SCI”.
- the first stage SCI format may include SCI format 1-A
- the second stage SCI format may include SCI format 2-A, SCI format 2-B, and SCI format 2-C.
- the first step SCI is priority information, frequency resource assignment information, time resource allocation information, resource reservation period information, DMRS (demodulation reference signal) pattern information, the second step SCI It may include one or more information elements among format information, beta_offset indicator, the number of DMRS ports, and modulation and coding scheme (MCS) information.
- the second step SCI is HARQ processor ID (identifier), RV (redundancy version), source (source) ID, destination (destination) ID, CSI request (request) information, zone (zone) ID, and communication range requirements (communication) range requirement) may include one or more information elements.
- SCI format 2-C may be used for decoding of PSSCH and/or providing inter-UE coordination information.
- “that an operation (eg, transmission operation) is set” means “setting information (eg, information element, parameter) for the operation” and/or “performation of the operation” It may mean that "indicating information” is signaled. "Setting an information element (eg, a parameter)” may mean that a corresponding information element is signaled.
- SI system information
- SIB system information block
- MIB master information block
- RRC RRC
- RRC RRC
- RRC RRC
- RRC RRC
- RRC RRC
- RRC RRC
- RRC RRC
- RRC RRC
- RRC RRC
- RRC RRC
- RRC RRC
- RRC RRC
- RRC RRC
- RRC RRC
- RRC RRC
- RRC RRC parameters and/or higher layer parameters
- MAC CE control element
- PHY signaling eg, transmission of downlink control information (DCI), uplink control information (UCI), and/or sidelink control information (SCI)
- DCI downlink control information
- UCI uplink control information
- SCI sidelink control information
- the MAC CE signaling operation may be performed through a data channel
- the PHY signaling operation may be performed through a control channel or a data channel
- the transmission of the SCI is the transmission of the first stage SCI and/or the second stage SCI.
- sidelink communication may support a discontinuous reception (DRX) operation.
- the resource sensing/selection operation may be performed in conjunction with a DRX operation (eg, a DRX cycle).
- the resource sensing/selection operation may mean “resource sensing operation”, “resource selection operation”, or “resource sensing operation and resource selection operation”.
- the DRX operation may be configured in consideration of a resource sensing/selection operation (eg, a resource sensing/selection period).
- the resource sensing/selection period may mean "resource sensing period", "resource selection period", or “resource sensing period and resource selection period”.
- the resource sensing period may mean a resource sensing window, and the resource selection period may mean a resource selection window.
- the DRX operation may be applied to a transmitting terminal, a receiving terminal, or "both a transmitting terminal and a receiving terminal".
- the transmitting terminal may mean a terminal transmitting data (eg, SL (sidelink) data)
- the receiving terminal may mean a terminal receiving data (eg, SL data). .
- the receiving terminal may operate according to the DRX cycle.
- the DRX cycle may include on-duration and off-duration.
- the on-duration may be referred to as an on-duration period
- the off-duration may be referred to as an off-duration period.
- the receiving terminal may operate in an on state (eg, a wake-up state) in an on-duration period within the DRX cycle. That is, the receiving terminal may perform a receiving operation and/or a transmitting operation in the on-duration interval.
- the receiving terminal may operate in an off state (eg, a sleep state, an idle state, or an inactive state) in an off-duration period within the DRX cycle. That is, the receiving terminal may not perform the receiving operation and/or the receiving operation in the off-duration period.
- the DRX configuration information may include DRX cycle information, on-duration information, and/or off-duration information.
- the DRX configuration information may be signaled from a communication node (eg, a base station and/or a transmitting terminal) to a transmitting terminal and/or a receiving terminal.
- the transmitting terminal may attempt data transmission in the on-duration interval based on DRX configuration information configured in the receiving terminal(s). Data transmission may be performed based on a unicast method, a groupcast method, a multicast method, or a broadcast method. When the groupcast method is used, the transmitting terminal may attempt data transmission in the on-duration interval based on DRX configuration information configured in a group including one or more receiving terminals.
- the terminal may support communication in a plurality of links.
- the terminal may perform a function of a receiving terminal in one or more links among a plurality of links.
- the corresponding terminal may attempt to receive data in the on-duration interval based on DRX configuration information configured for the receiving terminal.
- the terminal may operate in an on state in an on-duration period according to the DRX configuration information. Therefore, when the corresponding terminal performs the function of the transmitting terminal in another link, the corresponding terminal may perform the transmitting operation and/or the receiving operation based on the DRX configuration information.
- Period (per-direction) discontinuous transmission or reception (DTRX) operation in which a terminal (eg, a transmitting terminal) performs a transmission operation and/or a reception operation in an on-duration interval according to the DRX configuration information”
- Performing a reception operation by a terminal (eg, a reception terminal) in an on-duration interval according to the DRX configuration information” may be referred to as a "DRX operation for each direction”.
- a DTRX operation for each direction and a DRX operation for each direction are simultaneously performed on one link may be referred to as a “both-direction DTRX operation”.
- the same DRX configuration information may be applied.
- the DTRX operation for each direction and the DRX operation for each direction may be performed.
- FIG. 7 is a conceptual diagram illustrating a first embodiment of sidelink communication supporting a DRX operation.
- a first terminal may be a transmitting terminal in sidelink communication
- a second terminal may be a receiving terminal in sidelink communication. "When the second terminal performs the DRX operation, data to be transmitted to the second terminal occurs in the first terminal, and it is necessary to perform the resource sensing/selection operation", the first terminal may operate as follows.
- the second terminal may perform the receiving operation in an on-duration interval based on the DRX configuration information of the second terminal.
- the first terminal eg, the transmitting terminal
- the first terminal may perform the DRX operation for each direction and/or the resource sensing/selection operation in consideration of the DRX configuration information of the second terminal.
- Embodiment 1 The start time of the resource sensing operation (eg, the initial resource sensing operation) of the first terminal may be set independently of the DRX operation of the second terminal.
- the start time of the initial resource sensing operation may be set independently of the DRX operation.
- the first terminal may perform a resource sensing operation based on the resource sensing configuration information independently of the DRX cycle configured in the second terminal.
- the resource sensing configuration information may be preset from the base station to the first terminal. Thereafter, the first terminal may perform a resource selection operation in the on-duration interval of the second terminal based on the result of the resource sensing operation, and may transmit data using the resources selected by the resource selection operation.
- the on-duration period of the first terminal may be an on-duration period configured for the first terminal (eg, an on-duration period according to DRX configuration information for the first terminal), and the second terminal
- the on-duration period of ? may be an on-duration period configured for the second terminal (eg, an on-duration period according to DRX configuration information for the second terminal).
- the resource selection operation may be performed based on resource selection configuration information.
- the resource sensing configuration information and/or the resource selection configuration information may be configured in consideration of the DRX operation.
- the base station may generate resource sensing configuration information and/or resource selection configuration information in consideration of the DRX operation, and transmit the resource sensing configuration information and/or resource selection configuration information to the communication node (eg, the first terminal and/or the second terminal).
- the resource sensing/selection operation of the first terminal may be performed based on the following method(s).
- the first terminal may perform the resource selection operation based on the result of the resource sensing operation in the earliest on-duration period among the on-duration periods of the second terminal.
- the above-described operation may be performed with the highest priority.
- at least one of the following methods 1 and 2 may be performed.
- the first terminal may stop the resource selection operation until the start time of the on-duration period of the second terminal, and the second terminal
- the on-duration section of may be set as a resource selection window, and a resource selection operation may be performed in the set resource selection window.
- the first terminal may extend the resource sensing window until the start time of the on-duration period of the second terminal, and the extended resource A resource sensing operation may be performed in the sensing window. Thereafter, the first terminal may set the on-duration period of the second terminal as a resource selection window, and may perform a resource selection operation in the set resource selection window.
- Method 1 and Method 2 may be used.
- a method extended based on method 1 and/or a method extended based on method 2 may be used.
- the application of method 2 may not be possible in consideration of the operation of the first terminal in the other link.
- method 1 can be applied.
- Method 1 and/or method 2 may be performed as one method according to the setting of the communication system.
- the first terminal may selectively perform method 1 or method 2 according to the communication environment.
- the first terminal may (re)perform the resource sensing operation from the end of the on-duration period (eg, the earliest on-duration period) of the second terminal. In this case, the first terminal may set the resource sensing window until the start time of the next on-duration period of the second terminal, and may perform the resource sensing operation in the set resource sensing window. Thereafter, the first terminal may set the on-duration period after the resource sensing operation (eg, the resource sensing window) as the resource selection window, and may perform the resource selection operation in the set resource selection window.
- the resource sensing operation eg, the resource sensing window
- the first terminal sets the resource sensing window of the second terminal's on-duration period (eg, the earliest on-duration period) from the end point of the on-duration period after n on-duration periods It can be set to a section up to the start time, and a resource sensing operation can be performed in the set resource sensing window.
- n may be a natural number.
- the first terminal may set the on-duration period after the resource sensing operation (eg, the resource sensing window) as the resource selection window, and may perform the resource selection operation in the set resource selection window.
- the first terminal may (re)perform the resource sensing operation in some or all of the on-duration sections (eg, earliest on-duration sections) of the second terminal. In this case, the size of the resource sensing window may be maintained at a preset size.
- the first terminal may perform a resource selection operation based on method 1 or method 2.
- the first terminal may (re)perform the resource sensing operation in some or all of the on-duration sections (eg, earliest on-duration sections) of the second terminal.
- the first terminal may set the resource sensing window until the start time of the next on-duration period of the second terminal, and may perform the resource sensing operation in the set resource sensing window.
- the first terminal may set the on-duration period after the resource sensing operation (eg, the resource sensing window) as the resource selection window, and may perform the resource selection operation in the set resource selection window.
- the first terminal may (re)perform the resource sensing operation in some or all of the on-duration sections (eg, earliest on-duration sections) of the second terminal.
- the first terminal may set the resource sensing window as a period from the end of the on-duration period of the second terminal to the start time of the on-duration period after n on-duration periods, and in the set resource sensing window A resource sensing operation may be performed.
- n may be a natural number.
- the first terminal may set the on-duration period after the resource sensing operation (eg, the resource sensing window) as the resource selection window, and may perform the resource selection operation in the set resource selection window.
- the first terminal may set a part or the entire section of the on-duration section (eg, on-duration section for resource selection) of the second terminal as the resource sensing window, and in the set resource sensing window A resource sensing operation may be performed.
- the first terminal may perform a resource sensing operation based on the resource sensing configuration information after the end of the on-duration period of the second terminal.
- the first terminal may perform method 1 or method 2.
- the result of the resource sensing operation performed before the start time of the on-duration interval after n DRX cycles (eg, n on-duration intervals) is "of the second terminal" resource selection is possible in the on-duration period".
- the first terminal may stop the resource sensing operation and may perform the resource selection operation.
- the resource sensing window includes an on-duration period and an off-duration period of the second terminal.
- Embodiment 2 The start time of the resource sensing operation (eg, the initial resource sensing operation) of the first terminal may be set to be associated with the DRX operation of the second terminal.
- the start time of the initial resource sensing operation may be set to be associated with the DRX operation.
- the first terminal may perform a resource sensing operation based on the resource sensing configuration information in consideration of the DRX cycle configured in the second terminal.
- the resource sensing configuration information may be preset from the base station to the first terminal.
- the first terminal may perform a resource selection operation in the on-duration interval of the second terminal based on the result of the resource sensing operation, and may transmit data using the transmission resources selected by the resource selection operation.
- the resource selection operation may be performed based on resource selection configuration information.
- the resource sensing configuration information and/or the resource selection configuration information may be configured in consideration of the DRX operation.
- the base station may generate resource sensing configuration information and/or resource selection configuration information in consideration of the DRX operation, and transmit the resource sensing configuration information and/or resource selection configuration information to the communication node (eg, the first terminal and/or to the second terminal).
- the resource sensing/selection operation of the first terminal may be performed based on the following method(s).
- the first terminal may set the start time of the resource sensing operation to be before the start time of the specific on-duration period of the second terminal based on the preset resource sensing window.
- the specific on-duration period may be the earliest on-duration period of the second terminal. In this case, one of the methods 9 to 11 below may be performed.
- the first terminal may set the on-duration section of the second terminal existing after L from the current time point as the resource selection window.
- the start time of the resource selection window is T
- the first terminal may perform a resource sensing operation from "a time point corresponding to TL" or "a point before TL".
- the unit of L may be a symbol, a mini-slot, a slot, or milliseconds.
- the resource sensing operation of the first terminal is performed from the "time before the TL”
- the first terminal performs the resource in the interval from the end time of the resource sensing operation (eg, resource sensing window) to the start time of the resource selection window.
- the sensing operation may be continuously (eg, additionally) performed.
- the first terminal may not perform the resource sensing operation in the interval from the end time of the resource sensing operation (eg, the resource sensing window) to the start time of the resource selection window, and perform the resource selection operation in the resource selection window. can be done
- the first terminal may perform the resource sensing operation only in the on-duration period of the second terminal from the current time.
- the length of the accumulated on-duration intervals in which the resource sensing operation is performed may not exceed L.
- the first terminal may perform the resource selection operation in the on-duration interval of the second terminal.
- the units of L may be symbols, mini-slots, slots, or milliseconds. If "n number of on-durations (eg, on-duration #1 to #n) + some period of on-duration #n+1" is L, the first terminal is The resource sensing operation may be stopped at the end of some section. After that, the first terminal may perform a resource selection operation.
- the first terminal may perform the resource selection operation after a partial period of on-duration #n+1.
- n may be a natural number.
- the first terminal may perform a resource sensing operation for on-duration #n+1, and may perform a resource selection operation for on-duration after on-duration #n+1.
- the first terminal may stop the resource sensing operation at the end of some period of on-duration #n+1, and perform the resource selection operation in the on-duration after on-duration #n+1.
- the resource sensing window may be set to n on-duration intervals.
- n may be a natural number.
- the n on-duration intervals may be on-duration intervals of the second terminal.
- the first terminal may perform a resource sensing operation in n on-duration intervals of the second terminal based on the current time point. The number of accumulated on-duration intervals in which the resource sensing operation is performed may not exceed n.
- the first terminal may perform the resource selection operation in the on-duration interval of the second terminal.
- the resource sensing window is set to n on-duration intervals
- the resource sensing operation may be performed in consecutive n on-duration intervals (eg, on-durations #1 to #n).
- the first terminal may perform a resource selection operation in on-duration #n+1 after consecutive n on-duration intervals (eg, on-durations #1 to #n).
- the resource sensing window may include an on-duration period and an off-duration period of the second terminal.
- the resource sensing window may include only the on-duration period of the second terminal. “Methods extended based on the above methods” and/or “combination of the above methods” may be used.
- Embodiment 3 Resource sensing/selection operation considering congestion in sidelink communication supporting DRX operation
- the first terminal may perform a resource sensing operation in the resource sensing window.
- the congestion level may be determined based on a result of the resource sensing operation.
- the congestion level may be determined based on a channel busy ratio (CBR) and/or a channel occupancy ratio (CR).
- a communication node eg, a base station and/or another transmitting terminal
- the above-described threshold value may be signaled using at least one of system information, RRC message, MAC CE, and control information (eg, DCI, SCI).
- the resource sensing operation may be re-performed as follows.
- the resource sensing operation in methods 3, 4, and 8 may be re-performed from the end of the on-duration period. have.
- the resource sensing operation may be re-performed in some or all of the on-duration intervals.
- the resource sensing operation in methods 9 and 10 may be performed in a resource sensing window having a length L, and then The resource sensing operation may be re-performed.
- the resource sensing operation may be performed in a resource sensing window including n on-duration intervals, and then the resource sensing operation may be performed again.
- the first terminal may terminate the resource sensing operation and may perform the resource selection operation in the earliest on-duration interval of the second terminal.
- the methods 12 to 14 below may be used.
- the first terminal may stop the resource sensing operation in a specific time interval before re-performing the resource sensing operation, and may perform the resource sensing operation after the specific time interval.
- a specific time period may be set to be associated with a DRX cycle.
- the number of re-execution of the resource sensing operation may be limited.
- the first terminal may continuously perform two resource sensing operations after performing the initial resource sensing operation. After that, the first terminal may stop the resource sensing operation. Also, the resource selection operation may be stopped.
- the threshold which is a criterion for determining the degree of congestion, may be set to change according to the number of times of re-performing the resource sensing operation. For example, as the number of times of re-performing the resource sensing operation increases, the threshold value may decrease. Alternatively, the threshold value may increase as the number of times of re-performing the resource sensing operation increases.
- a communication node eg, a base station and/or another transmitting terminal
- has the above-described parameter(s) eg, a threshold that is a criterion for determining the degree of congestion, a specific time period, and/or the maximum number of re-performations of the resource sensing operation
- the first terminal may be transmitted to the first terminal using at least one of system information, RRC message, MAC CE, or control information (eg, DCI, SCI).
- control information eg, DCI, SCI
- a first terminal may support a plurality of links.
- the first terminal may perform a function of a receiving terminal in one or more links among a plurality of links.
- the first terminal may perform a reception operation based on DRX configuration information configured for the reception terminal.
- the first terminal may operate in a wake-up state in the on-duration period according to the DRX configuration information. Therefore, when the first terminal performs the function of the transmitting terminal in another link, the first terminal may perform a transmission operation or a reception operation according to the DRX configuration information.
- the first terminal may operate in a wake-up state in the on-duration interval according to the DRX configuration information, and may perform a transmission operation or a reception operation in the corresponding on-duration interval. That is, the first terminal may perform a resource sensing/selection operation in the on-duration period.
- Embodiment 4 “When the first terminal performs the DTRX operation for each direction and data to be transmitted to the second terminal occurs in the first terminal", the first terminal may determine candidate resources by performing a resource sensing operation, By performing the resource selection operation, transmission resources may be selected from candidate resources, and data may be transmitted to the second terminal using the transmission resources.
- the first terminal may perform a resource sensing operation based on resource sensing configuration information in an on-duration interval configured for the first terminal.
- the first terminal When the resource sensing operation is terminated, the first terminal may perform the resource selection operation in the on-duration period of the first terminal.
- the resource sensing configuration information and/or resource selection configuration information for the first terminal may be configured in consideration of a DRX operation (eg, a DTRX operation for each direction).
- the first terminal may perform a resource sensing/selection operation based on the following method(s).
- the start time of the resource sensing window of the first terminal may be set as the start time of the on-duration period of the first terminal.
- the on-duration period in which the resource sensing window starts may be the earliest on-duration period after determination of the resource sensing operation among the on-duration periods of the first terminal. In this case, the method 15 or method 16 below may be performed.
- the first terminal may perform the resource sensing operation only in the on-duration interval of the first terminal from the current time.
- the length of the accumulated on-duration intervals in which the resource sensing operation is performed may not exceed L.
- the first terminal may perform the resource selection operation in the on-duration interval of the first terminal.
- the units of L may be symbols, mini-slots, slots, or milliseconds. If "n number of on-duration intervals (eg, on-duration #1 to #n) + some interval of on-duration #n+1" is L, the first terminal is on-duration #n+1 It is possible to stop the resource sensing operation at the end of some section of .
- the first terminal may perform a resource selection operation. That is, the first terminal may perform the resource selection operation after a partial period of on-duration #n+1. n may be a natural number. Alternatively, the first terminal may perform a resource sensing operation for on-duration #n+1, and may perform a resource selection operation for on-duration after on-duration #n+1. Alternatively, the first terminal may stop the resource sensing operation at the end of some period of on-duration #n+1, and perform the resource selection operation in the on-duration after on-duration #n+1. can
- the resource sensing window may be set to n on-duration intervals.
- n may be a natural number.
- the n on-duration intervals may be on-duration intervals of the first terminal.
- the first terminal may perform a resource sensing operation in n on-duration intervals of the first terminal based on the current time point. The number of accumulated on-duration intervals in which the resource sensing operation is performed may not exceed n.
- the first terminal may perform a resource selection operation in the on-duration period of the first terminal.
- the resource sensing window is set to n on-duration intervals, the resource sensing operation may be performed in consecutive n on-duration intervals (eg, on-durations #1 to #n).
- the first terminal may perform a resource selection operation in on-duration #n+1 after consecutive n on-duration intervals (eg, on-durations #1 to #n).
- the first terminal may perform a resource sensing operation in the resource sensing window.
- the congestion level may be determined based on CBR and/or CR.
- a communication node eg, a base station and/or another transmitting terminal
- the above-described threshold value may be signaled using at least one of system information, RRC message, MAC CE, and control information (eg, DCI, SCI).
- the resource sensing operation may be re-performed as follows.
- the first terminal sets the resource sensing window (eg, "resource sensing window having length L" or " A resource sensing operation may be performed in "a resource sensing window including n on-duration intervals"), and then the resource sensing operation may be continuously performed. That is, the resource sensing operation may be re-performed.
- a threshold value e.g, when resource selection is not possible
- the first terminal may terminate the resource sensing operation. Thereafter, the first terminal may perform the resource selection operation in the earliest on-duration interval overlapping the resource selection window among the on-duration intervals of the first terminal.
- the method(s) below may be used.
- the first terminal may stop the resource sensing operation in a specific time interval before re-performing the resource sensing operation, and may perform the resource sensing operation after the specific time interval.
- a specific time period may be set to be associated with a DRX cycle.
- the number of re-execution of the resource sensing operation may be limited.
- the first terminal may continuously perform two resource sensing operations after performing the initial resource sensing operation. After that, the first terminal may stop the resource sensing operation. Also, the resource selection operation may be stopped.
- the threshold which is a criterion for determining the degree of congestion, may be set to be changed according to the number of times of re-performing the resource sensing operation. For example, as the number of times of re-performing the resource sensing operation increases, the threshold value may decrease. Alternatively, the threshold value may increase as the number of times of re-performing the resource sensing operation increases.
- a communication node eg, a base station and/or another transmitting terminal
- the above-described parameter(s) eg, a threshold that is a criterion for determining the degree of congestion, a specific time period, and/or the maximum number of re-performations of the resource sensing operation
- the resource sensing operation of the first terminal may be performed not only for on-duration but also for off-duration.
- the DTRX operation for each direction and the DRX operation for each direction may be simultaneously performed on one link.
- the above-described operation may be referred to as a bidirectional DTRX operation.
- a first terminal eg, a transmitting terminal
- the second terminal A terminal eg, a receiving terminal
- the DRX configuration information of the first terminal may be set to be the same as the DRX configuration information of the second terminal.
- the DRX configuration information of the first terminal may be configured differently from the DRX configuration information of the second terminal.
- the first terminal may perform a resource sensing operation based on the method 20 and/or method 21 below for data transmission.
- the first terminal may perform the resource sensing operation only in the on-duration interval of the first terminal from the current time.
- the length of the accumulated on-duration intervals in which the resource sensing operation is performed may not exceed L.
- the units of L may be symbols, mini-slots, slots, or milliseconds.
- the first terminal performs a resource selection operation in the first interval (hereinafter referred to as "the initial overlapping interval") in which the on-duration interval of the first terminal and the on-duration interval of the second terminal overlap. can do.
- the overlapping section may mean an overlapping section after the first overlapping section or the first overlapping section.
- the first terminal may continuously (eg, additionally) perform the resource sensing operation in the interval from the end time of the resource sensing operation to the start time of the overlapping interval (eg, the first overlapping interval) and , a resource selection operation may be performed in the overlapping section.
- the first terminal may stop the resource sensing operation at the end of the resource sensing window and may perform the resource selection operation. That is, the first terminal may perform the resource selection operation from the end of the resource sensing window within the overlapping section.
- the first terminal may stop the resource sensing operation after the end of the resource sensing window within the overlapping interval, and may perform the resource selection operation in the next overlapping interval.
- the first terminal may continuously perform the resource sensing operation until the overlapping section (eg, the first overlapping section), and perform the resource selection operation in the next overlapping section can do.
- the resource sensing window may be set to n on-duration intervals. n may be a natural number.
- the first terminal may perform a resource sensing operation in n on-duration intervals of the first terminal based on the current time point. The number of accumulated on-duration intervals in which the resource sensing operation is performed may not exceed n.
- the first terminal may perform the resource selection operation in a section (ie, overlapping section) in which the on-duration section of the first terminal and the on-duration section of the second terminal overlap.
- the resource sensing operation may be performed in consecutive n on-duration intervals (eg, on-durations #1 to #n).
- the first terminal may perform a resource selection operation in the overlapping section.
- the first terminal may stop the resource sensing operation in a period from the end of the resource sensing operation to the beginning of the overlapping period.
- the first terminal may continuously perform the resource sensing operation in the interval from the end of the resource sensing operation to the beginning of the overlapping interval.
- the first terminal may perform a resource sensing operation in the resource sensing window.
- the congestion level may be determined based on CBR and/or CR.
- a communication node eg, a base station and/or another transmitting terminal
- the above-described threshold value may be signaled using at least one of system information, RRC message, MAC CE, and control information (eg, DCI, SCI).
- the resource sensing operation may be re-performed as follows.
- the first terminal may display a resource sensing window (eg, a “resource sensing window having a length L” or “ A resource sensing operation may be performed in "a resource sensing window including n on-duration intervals”), and then the resource sensing operation may be continuously performed. That is, the resource sensing operation may be re-performed.
- a resource sensing window eg, a “resource sensing window having a length L” or “ A resource sensing operation may be performed in "a resource sensing window including n on-duration intervals”
- the first terminal may terminate the resource sensing operation. After that, the first terminal may perform a resource selection operation in the first overlapping interval.
- the method(s) below may be used.
- the first terminal may stop the resource sensing operation in a specific time interval before re-performing the resource sensing operation, and may perform the resource sensing operation after the specific time interval.
- a specific time period may be set to be associated with a DRX cycle.
- the number of times of re-performing the resource sensing operation may be limited.
- the first terminal may continuously perform two resource sensing operations after performing the initial resource sensing operation. After that, the first terminal may stop the resource sensing operation. Also, the resource selection operation may be stopped.
- the threshold which is a criterion for determining the degree of congestion, may be set to be changed according to the number of times of re-performing the resource sensing operation. For example, as the number of times of re-performing the resource sensing operation increases, the threshold value may decrease. Alternatively, the threshold value may increase as the number of times of re-performing the resource sensing operation increases.
- a communication node eg, a base station and/or another transmitting terminal
- the above-described parameter(s) eg, a threshold that is a criterion for determining the degree of congestion, a specific time period, and/or the maximum number of re-performations of the resource sensing operation
- the resource sensing operation of the first terminal may be performed not only in the on-duration period but also in the off-duration period.
- the first terminal may be a transmitting terminal or a receiving terminal for another SL.
- the first terminal may be a receiving terminal in the Uu link with the base station.
- the second terminal may be a transmitting terminal or a receiving terminal for another SL.
- the second terminal may be a receiving terminal in the Uu link with the base station.
- FIG. 8 is a conceptual diagram illustrating a second embodiment of sidelink communication supporting a DRX operation.
- communication between a first terminal and a second terminal may be performed on SL A, and communication between the first terminal and a third terminal may be performed on SL B.
- the first terminal may perform the function of a transmitting terminal or a receiving terminal in SL B. Even when the DRX operation is possible in SL A, when communication between the first terminal and the third terminal is performed in SL B, the first terminal may not be able to perform the DRX operation.
- FIG. 9 is a conceptual diagram illustrating a third embodiment of sidelink communication supporting a DRX operation.
- communication between a first terminal and a second terminal may be performed on SL A, and communication between the second terminal and a third terminal may be performed on SL B.
- the second terminal may perform the function of a transmitting terminal or a receiving terminal in SL B. Even when the DRX operation is possible in SL A, when communication between the second terminal and the third terminal is performed in SL B, the second terminal may not be able to perform the DRX operation.
- FIG. 10 is a conceptual diagram illustrating a fourth embodiment of sidelink communication supporting a DRX operation.
- communication between a first terminal and a second terminal may be performed in SL A
- communication between the first terminal and a third terminal may be performed in SL B
- between the second terminal and the fourth terminal Communication may be performed in SL C.
- the first terminal may perform the function of the transmitting terminal or the receiving terminal in SL B
- the second terminal may perform the function of the transmitting terminal or the receiving terminal in SL C.
- the above-described terminals may not be able to perform the DRX operation in the SL when they do not support the DRX operation.
- 11 is a conceptual diagram illustrating a DRX operation mode applicable to sidelink communication.
- the DRX operation mode (eg, applicable DRX operation mode) includes DTRX operation per direction, DRX operation per direction, and bidirectional DTRX operation. can do. Also, it may be set so that the DRX operation is not performed. That is, in case 1, the DRX operation mode may include a No DRX operation. In case 2, the first terminal may not perform the DRX operation, and the second terminal may perform the DRX operation. In this case, in case 2, the DRX operation mode may include a DRX operation for each direction and/or a No DRX operation.
- the first terminal may perform the DRX operation, and the second terminal may not perform the DRX operation.
- the DRX operation mode may include a DTRX operation for each direction and/or a No DRX operation.
- the DRX operation mode may be the No DRX operation.
- the DRX operation mode used in each case may be set in the terminal(s) by higher layer signaling (eg, system information, RRC message, and/or MAC CE). Alternatively, the DRX operation mode used in each case may be determined based on a specific condition (eg, cast type and/or congestion degree). Various DRX operation modes may be operated in conjunction. For example, a specific DRX operation mode may or may not be performed according to DRX configuration information.
- the methods according to the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer-readable medium.
- the computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination.
- the program instructions recorded on the computer readable medium may be specially designed and configured for the present invention, or may be known and available to those skilled in the art of computer software.
- Examples of computer-readable media include hardware devices specially configured to store and carry out program instructions, such as ROM, RAM, flash memory, and the like.
- Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like.
- the hardware device described above may be configured to operate as at least one software module to perform the operations of the present invention, and vice versa.
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Abstract
Description
Claims (20)
- 통신 시스템에서 제1 단말의 동작 방법으로서,DRX(discontinuous reception) 동작을 수행하는 제2 단말의 DRX 사이클을 고려하여 자원 센싱 동작을 수행하는 단계;상기 DRX 사이클 내의 온-듀레이션(on-duration) 구간(period)에서 상기 자원 센싱 동작의 결과에 기초하여 자원 선택 동작을 수행하는 단계; 및상기 자원 선택 동작에 의해 선택된 전송 자원들을 사용하여 상기 제2 단말과 사이드링크 통신을 수행하는 단계를 포함하는, 제1 단말의 동작 방법.
- 청구항 1에 있어서,상기 자원 센싱 동작이 수행되는 자원 센싱 윈도우의 종료 시점 이후에 존재하는 상기 제2 단말의 상기 온-듀레이션 구간은 상기 자원 선택 동작이 수행되는 자원 선택 윈도우로 설정되는, 제1 단말의 동작 방법.
- 청구항 2에 있어서,상기 자원 센싱 윈도우의 시작 시점이 "상기 자원 선택 윈도우의 시작 시점 - 상기 자원 센싱 윈도우의 길이" 이전인 경우, 상기 자원 센싱 윈도우의 상기 종료 시점부터 상기 자원 선택 윈도우의 상기 시작 시점까지의 구간에서 상기 자원 센싱 동작은 추가로 수행되는, 제1 단말의 동작 방법.
- 청구항 1에 있어서,상기 자원 센싱 동작은 상기 제2 단말에 설정된 하나 이상의 온-듀레이션 구간들에서 수행되고, 상기 하나 이상의 온-듀레이션 구간들의 길이는 상기 자원 센싱 동작을 위해 설정된 자원 센싱 윈도우의 길이를 초과하지 않는, 제1 단말의 동작 방법.
- 청구항 1에 있어서,상기 자원 센싱 동작이 수행되는 자원 센싱 윈도우는 상기 제2 단말에 설정된 n개의 온-듀레이션 구간들을 포함하고, 상기 자원 센싱 동작은 상기 n개의 온-듀레이션 구간들에서 수행되고, n은 자연수인, 제1 단말의 동작 방법.
- 청구항 1에 있어서,상기 자원 센싱 동작을 수행하는 단계는,제1 자원 센싱 윈도우에서 상기 자원 센싱 동작을 수행하는 단계; 및상기 제1 자원 센싱 윈도우에서 혼잡도가 임계값 이상인 경우에 상기 제1 자원 센싱 윈도우 이후에 상기 자원 센싱 동작을 재 수행하는 단계를 포함하는, 제1 단말의 동작 방법.
- 청구항 6에 있어서,상기 자원 센싱 동작의 재 수행 동작은 최대 재 전송 횟수만큼 수행되고, 상기 최대 재 전송 횟수는 상위계층 시그널링에 의해 설정되는, 제1 단말의 동작 방법.
- 청구항 1에 있어서,상기 자원 센싱 동작이 수행된 자원 센싱 윈도우에서 혼잡도가 임계값 미만인 경우, 상기 자원 센싱 동작 이후에 상기 자원 선택 동작은 수행되는, 제1 단말의 동작 방법.
- 통신 시스템에서 제1 단말의 동작 방법으로서,DRX(discontinuous reception) 동작을 수행하는 상기 제1 단말의 DRX 사이클을 고려하여 자원 센싱 동작을 수행하는 단계;상기 DRX 사이클 내의 온-듀레이션(on-duration) 구간(period)에서 상기 자원 센싱 동작의 결과에 기초하여 자원 선택 동작을 수행하는 단계; 및상기 자원 선택 동작에 의해 선택된 전송 자원들을 사용하여 제2 단말과 사이드링크 통신을 수행하는 단계를 포함하는, 제1 단말의 동작 방법.
- 청구항 9에 있어서,상기 자원 센싱 동작은 상기 제1 단말에 설정된 하나 이상의 온-듀레이션 구간들에서 수행되고, 상기 하나 이상의 온-듀레이션 구간들의 길이는 상기 자원 센싱 동작을 위해 설정된 자원 센싱 윈도우를 초과하지 않는, 제1 단말의 동작 방법.
- 청구항 9에 있어서,상기 자원 센싱 동작이 수행되는 자원 센싱 윈도우는 상기 제1 단말에 설정된 n개의 온-듀레이션 구간들을 포함하고, 상기 자원 센싱 동작은 상기 n개의 온-듀레이션 구간들에서 수행되고, n은 자연수인, 제1 단말의 동작 방법.
- 청구항 9에 있어서,상기 자원 센싱 동작을 수행하는 단계는,제1 자원 센싱 윈도우에서 상기 자원 센싱 동작을 수행하는 단계; 및상기 제1 자원 센싱 윈도우에서 혼잡도가 임계값 이상인 경우에 상기 제1 자원 센싱 윈도우 이후에 상기 자원 센싱 동작을 재 수행하는 단계를 포함하는, 제1 단말의 동작 방법.
- 청구항 12에 있어서,상기 자원 센싱 동작의 재 수행 동작은 최대 재 전송 횟수만큼 수행되고, 상기 임계값은 상기 자원 센싱 동작의 재 수행 횟수에 따라 변경되는, 제1 단말의 동작 방법.
- 청구항 12에 있어서,상기 자원 센싱 동작의 재 수행 전의 특정 시간 구간에서 상기 자원 센싱 동작은 중지되고, 상기 특정 시간 구간은 상기 DRX 사이클에 연관되도록 설정되는, 제1 단말의 동작 방법.
- 통신 시스템에서 제1 단말의 동작 방법으로서,DRX(discontinuous reception) 동작을 수행하는 상기 제1 단말의 DRX 사이클을 고려하여 자원 센싱 동작을 수행하는 단계;상기 제1 단말에 설정된 온-듀레이션(on-duration) 구간과 제2 단말에 설정된 온-듀레이션 구간 간의 중첩 구간에서 상기 자원 센싱 동작의 결과에 기초하여 자원 선택 동작을 수행하는 단계; 및상기 자원 선택 동작에 의해 선택된 전송 자원들을 사용하여 상기 제2 단말과 사이드링크 통신을 수행하는 단계를 포함하는, 제1 단말의 동작 방법.
- 청구항 15에 있어서,상기 제1 단말은 상기 제2 단말과의 상기 사이드링크 통신에서 송신 단말의 기능을 수행하고, 상기 제1 단말은 제3 단말과의 사이드링크 통신에서 DRX 설정 정보에 기초하여 수신 단말의 기능을 수행하는, 제1 단말의 동작 방법.
- 청구항 15에 있어서,상기 자원 센싱 동작은 상기 제1 단말을 위해 설정된 자원 센싱 윈도우에서 수행되고, 상기 자원 센싱 윈도우의 종료 시점부터 상기 중첩 구간의 시작 시점까지의 구간에서 상기 자원 센싱 동작은 추가적으로 수행되는, 제1 단말의 동작 방법.
- 청구항 15에 있어서,상기 자원 센싱 동작을 수행하는 단계는,제1 자원 센싱 윈도우에서 상기 자원 센싱 동작을 수행하는 단계; 및상기 제1 자원 센싱 윈도우에서 혼잡도가 임계값 이상인 경우에 상기 제1 자원 센싱 윈도우 이후에 상기 자원 센싱 동작을 재 수행하는 단계를 포함하는, 제1 단말의 동작 방법.
- 청구항 18에 있어서,상기 자원 센싱 동작의 재 수행 동작은 최대 재 전송 횟수만큼 수행되고, 상기 최대 재 전송 횟수는 상위계층 시그널링에 의해 설정되고, 상기 임계값은 상기 자원 센싱 동작의 재 수행 횟수에 따라 변경되는, 제1 단말의 동작 방법.
- 청구항 18에 있어서,상기 자원 센싱 동작의 재 수행 전의 특정 시간 구간에서 상기 자원 센싱 동작은 중지되고, 상기 특정 시간 구간은 상기 DRX 사이클에 연관되도록 설정되는, 제1 단말의 동작 방법.
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EP22776090.7A EP4294097A1 (en) | 2021-03-23 | 2022-03-23 | Method and device for resource sensing and selection in sidelink communication supporting drx operation |
CN202280023953.2A CN117044328A (zh) | 2021-03-23 | 2022-03-23 | 在支持drx操作的侧链路通信中进行资源侦听和选择的方法和装置 |
US18/367,271 US20230422217A1 (en) | 2021-03-23 | 2023-09-12 | Method and device for resource sensing and selection in sidelink communication supporting drx operation |
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US18/367,271 Continuation US20230422217A1 (en) | 2021-03-23 | 2023-09-12 | Method and device for resource sensing and selection in sidelink communication supporting drx operation |
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CATT, GOHIGH: "Discussion on resource allocation for power saving", 3GPP DRAFT; R1-2100351, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210125 - 20210205, 19 January 2021 (2021-01-19), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051970954 * |
FUJITSU: "Considerations on Partial Sensing and DRX in NR V2X", 3GPP DRAFT; R1-2101788, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210125 - 20210205, 22 January 2021 (2021-01-22), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051975890 * |
LG ELECTRONICS INC.: "Discussion on SL DRX wake-up time alignment between", 3GPP DRAFT; R2-2101706, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. electronic; 20210125 - 20210205, 15 January 2021 (2021-01-15), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051974573 * |
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EP4294097A1 (en) | 2023-12-20 |
KR20220132464A (ko) | 2022-09-30 |
CN117044328A (zh) | 2023-11-10 |
US20230422217A1 (en) | 2023-12-28 |
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