WO2023014047A1 - 사이드링크 통신에서 인터-ue 조정 정보의 요청 및 전송을 위한 방법 및 장치 - Google Patents
사이드링크 통신에서 인터-ue 조정 정보의 요청 및 전송을 위한 방법 및 장치 Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/25—Control channels or signalling for resource management between terminals via a wireless link, e.g. sidelink
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- H04W4/02—Services making use of location information
- H04W4/023—Services making use of location information using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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Definitions
- the present invention relates to a sidelink communication technology, and more particularly, to a technology for requesting and transmitting inter-user equipment coordination information.
- the frequency band of the 4G communication system For the processing of rapidly increasing wireless data after the commercialization of the 4th Generation (4G) communication system (eg, Long Term Evolution (LTE) communication system, LTE-A (Advanced) communication system), the frequency band of the 4G communication system (eg, a 5G (5th Generation) communication system (eg, NR (New Radio) communication system) is being considered.
- the 5G communication system may support eMBB (enhanced Mobile BroadBand), URLLC (Ultra-Reliable and Low Latency Communication), and 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 cellular communication systems such as 4G communication systems and 5G communication systems 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, and the like. .
- V2X communication (eg, C-V2X communication) is based on sidelink communication technology (eg, ProSe (Proximity based Services) communication technology, D2D (Device to Device) communication technology)
- sidelink communication technology eg, ProSe (Proximity based Services) communication technology, D2D (Device to Device) communication technology
- a sidelink channel 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 CG (configured grant) resources.
- CG resources may be configured periodically, and periodic data (eg, periodic sidelink data) may be transmitted using CG resources.
- sidelink communication may be performed based on resource allocation (RA) mode 1 or RA mode 2.
- RA mode 1 the base station may allocate resources for sidelink communication to user equipment (UE), and the UE may perform sidelink communication using the resources allocated by the base station.
- RA mode 2 the UE may determine a resource for sidelink communication by performing a resource sensing operation and/or a resource selection operation, and may perform sidelink communication using the determined resource.
- Power consumption by performing a resource sensing operation and/or a resource selection operation may be large.
- a resource sensing operation and/or a resource selection operation may not be normally performed.
- resource allocation efficiency according to RA mode 2 may decrease due to a hidden node problem, an exposed node problem, and/or a half-duplex problem.
- methods for performing a resource sensing operation and/or a resource selection operation based on the help of neighboring UEs are required.
- An object of the present invention to solve the above problems is to provide a method and apparatus for requesting and transmitting inter-user equipment coordination information in sidelink communication.
- a method of a first UE includes generating a first signaling message including a first information element indicating a transmission request of inter-UE coordination information; Transmitting a first signaling message, performing a reception operation of a second signaling message including the inter-UE coordination information during a first time interval from the transmission time of the first signaling message, and the second signaling message is received, performing sidelink communication in consideration of the inter-UE coordination information included in the second signaling message, and when the second signaling message is not received during the first time interval, The sidelink communication is performed without consideration of the inter-UE coordination information.
- the first signaling message may be transmitted in a unicast method, a group cast method, or a broadcast method, and when the first signaling message is transmitted in the unicast method, the first signaling message is transmitted to a UE-specific ID. And when the first signaling message is transmitted in the groupcast method, the first signaling message may be generated based on a group-specific ID, and the first signaling message is transmitted in the broadcast method. When transmitted as, the first signaling message may be generated based on an ID for broadcast transmission.
- the first signaling message may further include time offset information indicating the first time interval.
- the method of the first UE may further include receiving time offset information indicating the first time interval from a base station to which the first UE is connected.
- the first signaling message may be transmitted to a second UE and a third UE, respectively, and the first signaling message transmitted to the second UE and the first signaling message transmitted to the third UE may include the same information elements. Or it may contain different information elements.
- the first signaling message may further include a second information element indicating a transmission method of the second signaling message including the inter-UE coordination information.
- the transmission method may be classified into a first transmission method and a second transmission method, and when the first transmission method is used, the second signaling message may be transmitted when the inter-UE coordination information exists, , When the second transmission method is used, the second signaling message may be transmitted when a preset condition is satisfied.
- the preset condition is “a condition in which a distance between the first UE and a second UE receiving the first signaling message is less than a first threshold value” or “the reception strength of the first signaling message received in the second UE is The second threshold value or more condition” may be.
- the first signaling message may further include a third information element indicating a transmission resource of the second signaling message, and the transmission resource may be a PSFCH resource or a resource sensed by the first UE.
- the second signaling message may include ACK information or NACK information, and each of the ACK information and the NACK information is indicated by the first signaling message Preferred resources, non-preferred resources, predicted/potential resource conflicts, or detected resource conflicts may be indicated.
- a method of a second UE includes a first information element indicating a transmission request of inter-UE coordination information and a transmission method of the inter-UE coordination information.
- Receiving a first signaling message including a second information element from a first UE generating the inter-UE coordination information according to the transmission request when the condition according to the transmission scheme is satisfied, and -transmitting a second signaling message including UE coordination information to the first UE.
- the condition may be "a condition in which the distance between the first UE and the second UE is less than a first threshold value" or "a condition in which the reception strength of the first signaling message is greater than or equal to a second threshold value”.
- the first signaling message may further include a third information element indicating a transmission resource of the second signaling message, and the transmission resource may be a PSFCH resource or a resource sensed by the first UE.
- the second signaling message may include ACK information or NACK information, and each of the ACK information and the NACK information is indicated by the first signaling message Preferred resources, non-preferred resources, predicted/potential resource conflicts, or detected resource conflicts may be indicated.
- the first signaling message may further include time offset information, and the second signaling message may be transmitted within a time interval corresponding to the time offset from a reception time of the first signaling message.
- the first signaling message may be transmitted in a unicast method, a group cast method, or a broadcast method, and when the first signaling message is transmitted in the unicast method, the first signaling message is transmitted to a UE-specific ID.
- the first signaling message may be received based on a group-specific ID, and the first signaling message is transmitted in the broadcast method.
- the first signaling message may be received based on an ID for broadcast transmission.
- a first UE includes a processor and a memory for storing one or more instructions executed by the processor, wherein the one or more instructions include inter-UE coordination information
- the one or more instructions include inter-UE coordination information
- a first signaling message including a first information element indicating a transmission request is generated, the first signaling message is transmitted to a second UE, and during a first time interval from a transmission time of the first signaling message, the inter- Perform a reception operation of a second signaling message including UE coordination information, and when the second signaling message is received from the second UE, in consideration of the inter-UE coordination information included in the second signaling message
- Information on the time offset indicating the first time interval may be included in the first signaling message or set by a base station to which the first UE is connected.
- the first signaling message may further include a second information element indicating a transmission scheme of the second signaling message including the inter-UE coordination information, wherein the transmission scheme is a first transmission scheme and a second transmission scheme.
- the second signaling message may be transmitted if the inter-UE coordination information exists, and in case the second transmission method is used, the second signaling message may be transmitted. 2
- the signaling message may be transmitted when a preset condition is satisfied.
- the first signaling message may further include a third information element indicating a transmission resource of the second signaling message, the transmission resource may be a PSFCH resource or a resource sensed by the first UE, and the 2
- the second signaling message may include ACK information or NACK information, and each of the ACK information and the NACK information corresponds to a preference indicated by the first signaling message. It may indicate a resource, non-preferred resource, predicted/potential resource conflict, or detected resource conflict.
- the first signaling message indicating a request for transmission of inter-user equipment (UE) coordination information is a unicast method, a groupcast method, or a broadcast method. ) method can be transmitted.
- UE-B may transmit a second signaling message including inter-UE coordination information when a preset condition is satisfied.
- a resource through which the second signaling message is transmitted may be indicated by the first signaling message.
- 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 showing 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 flowchart illustrating a first embodiment of a sidelink communication method.
- FIG. 8 is a flowchart illustrating a second embodiment of a sidelink communication method.
- FIG. 9 is a flowchart illustrating a third embodiment of a sidelink communication method.
- FIG. 10 is a flowchart illustrating a fourth embodiment of a sidelink communication method.
- FIG. 11 is a flowchart illustrating a fifth embodiment of a sidelink communication method.
- FIG. 12 is a timing diagram illustrating a first embodiment of a data transmission method.
- first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention.
- the term "and/or" includes any 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, “one or more of A and B” may mean “one or more of A or B” or “one or more of combinations of one or more of A and B”.
- (re)transfer may mean “send”, “retransmit”, or “send and retransmit”
- (re)set may mean “set”, “reset”, or “set and “Reset”
- (re)connect can mean “connect”, “reconnect”, or “connect and reconnect”
- (re)connect can mean “connect”, “reconnect”, or “reconnect” connect and reconnect”.
- 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 a cellular communication system (eg, a cellular communication network) 140, and the V2X communication supported by the cellular communication system 140 is "C-V2X (Cellular-Vehicle to everything) communication " can be referred to as
- the cellular communication system 140 includes a 4th generation (4G) communication system (eg, a long term evolution (LTE) communication system, an advanced (LTE-A) communication system), a 5th generation (5G) communication system (eg, NR (New Radio) communication system) and the like.
- 4G 4th generation
- LTE long term evolution
- LTE-A advanced
- 5G 5th generation
- NR New Radio
- V2V communication is communication between vehicle #1 (100) (eg, a communication node located in vehicle #1 (100)) and vehicle #2 (110) (eg, a communication node located in 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, ProSe (Proximity based Services) communication technology, D2D (Device to Device) communication technology).
- sidelink communication technology eg, ProSe (Proximity based Services) communication technology, D2D (Device to Device) communication technology.
- communication between the vehicles 100 and 110 may be performed using a sidelink channel.
- V2I communication may refer to communication between vehicle #1 100 and an infrastructure (eg, a roadside unit (RSU)) 120 located on a roadside.
- the infrastructure 120 may be a traffic light or a street lamp located on a roadside.
- V2I communication when V2I communication is performed, communication may be performed between a communication node located in 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 refer to communication between vehicle #1 100 (eg, a communication node located in vehicle #1 100) and a person 130 (eg, a communication node owned by person 130).
- vehicle #1 100 eg, a communication node located in vehicle #1 100
- person 130 eg, a communication node owned 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.
- the communication node located in the 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 obtained 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). In this case, communication between a communication node located in the vehicle #1 100 or a communication node possessed by the person 130 may be
- 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 can be performed based on 4G communication technology (eg, LTE communication technology and LTE-A communication technology specified in the 3GPP standard), 5G communication technology (eg, NR communication technology specified in the 3GPP standard), etc. there is.
- 4G communication technology eg, LTE communication technology and LTE-A communication technology specified in the 3GPP standard
- 5G communication technology eg, NR communication technology specified in the 3GPP standard
- V2N communication is a communication technology specified 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 specified in the 702.15 standard (eg, Wireless Personal Area Network (WPAN), etc.).
- 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 702.15 eg, Wireless Personal Area Network (WPAN), etc.
- 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.
- a 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.
- the UEs 231 to 236 may be communication nodes located in vehicles 100 and 110 in FIG. 1 , communication nodes located in infrastructure 120 in FIG. 1 , communication nodes owned by person 130 in FIG. 1 , and the like.
- the core network includes 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 composed of the S-GW 250, P-GW 260, MME 270, etc. is not only 4G communication technology but also 5G communication technology can also be supported, and the core network composed of the UPF 250, SMF 260, AMF 270, etc. can support 4G communication technology as well as 5G communication technology.
- the core network may be divided into a plurality of logical network slices.
- a network slice eg, V2V network slice, V2I network slice, V2P network slice, V2N network slice, etc.
- V2X communication may be configured in a V2X network slice configured in a core network.
- Communication nodes constituting a cellular communication system are code division multiple access (CDMA) technology, wideband (WCDMA) 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) -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) ) can perform communication using at least one communication technology among the technologies.
- CDMA code division multiple access
- WCDMA wideband
- TDMA time division multiple access
- FDMA frequency division multiple access
- OFDM orthogonal frequency division multiplexing
- Filtered OFDM technology OFDMA (orthogonal frequency division multiple access) technology
- 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 showing a first embodiment of a communication node constituting a cellular communication system.
- a 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 component included in the communication node 300 may be connected by a bus 370 to communicate with each other.
- each component included in the communication node 300 may be connected through an individual interface or an individual bus centered on the processor 310 instead of the common bus 370 .
- the processor 310 may be connected to at least one of the memory 320, the transmission/reception device 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 refer to 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 include at least one of a volatile storage medium and a non-volatile storage medium.
- the memory 320 may include at least one of a read only memory (ROM) and a random access memory (RAM).
- a base station 210 may form a macro cell or a small cell, and may be connected to a core network through an ideal backhaul or a non-ideal backhaul.
- the base station 210 may transmit signals received from the core network to the UEs 231 to 236 and the relay 220, and may transmit signals 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, and 236) may belong to the 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 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 and 234).
- the relay 220 may transmit signals received from the base station 210 to the UEs #3 and #4 (233 and 234), and transmit signals received from the UEs #3 and #4 (233 and 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, and 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 (233 and 234) may be connected to the relay 220 by performing a connection establishment procedure with the relay 220.
- UEs #3 and #4 (233 and 234) 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, coordinated multipoint (CoMP) communication technology, Carrier Aggregation (CA) 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, and 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 and 234) may perform operations corresponding to the relay 220 and operations supported by the relay 220.
- the base station 210 includes a NodeB, an evolved NodeB, a base transceiver station (BTS), a radio remote head (RRH), a transmission reception point (TRP), a radio unit (RU), and an RSU ( road side unit), a radio transceiver, an access point, an access node, and the like.
- the relay 220 may be referred to as a small base station, relay node, or the like.
- the UEs 231 to 236 are terminals, access terminals, mobile terminals, stations, subscriber stations, mobile stations, and portable subscriber stations. subscriber station), a node, a device, an on-broad unit (OBU), and the like.
- communication between UE #5 235 and UE #6 236 may be performed based on a cycled communication technology (eg, ProSe communication technology, D2D communication technology).
- Sidelink communication may be performed based on a one-to-one method or a one-to-many method.
- UE #5 (235) may indicate a communication node located in vehicle #1 (100) of FIG. 1, and UE #6 (236) of FIG.
- a communication node located in vehicle #2 (110) may be indicated.
- UE #5 (235) may indicate a communication node located in vehicle #1 (100) of FIG. 1, and UE #6 (236) of FIG.
- a communication node located in the infrastructure 120 may be indicated.
- UE #5 (235) may indicate a communication node located in vehicle #1 (100) of FIG. 1, and UE #6 (236) of FIG.
- a communication node possessed by the person 130 may be indicated.
- Scenarios to which sidelink communication is applied may be classified as shown in Table 1 below according to 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 (eg, UE #5 235 and UE #6 236) performing sidelink communication 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 shown in FIG. 2
- UE #6 236 may be UE #6 236 shown 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 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. etc. may be included.
- PHY physical
- MAC medium access control
- RLC radio link control
- PDCP packet data convergence protocol
- HARQ hybrid automatic repeat request
- AM RLC acknowledged mode
- UM RLC unacknowledged mode
- a control plane protocol stack of UEs (eg, UE #5 235 and UE #6 236) performing sidelink communication 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 illustrates 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 shown in FIG. 2
- UE #6 236 may be UE #6 236 shown in FIG. can
- 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 transmitting and receiving 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, PC5-C interface).
- the control plane protocol stack shown in FIG. 6 may be a control plane protocol stack for one-to-one sidelink communication.
- 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.
- channels used in sidelink communication between UE #5 235 and UE #6 236 include Physical Sidelink Shared Channel (PSSCH), Physical Sidelink Control Channel (PSCCH), Physical Sidelink Discovery Channel (PSBCH), and 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 UEs (eg, UE #5 235 and 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 UEs (eg, UE #5 235 and UE #6 236) by higher layer signaling. there is.
- PSDCH may be used for discovery procedures.
- 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 UE #5 235 and UE #6 236.
- the synchronization signal may include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS).
- sidelink transmission modes may be classified into sidelink TMs #1 to #4 as shown in Table 2 below.
- UE #5 235 and UE #6 236 each perform sidelink communication using a resource pool configured 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 configured by a broadcast RRC signaling procedure.
- a resource pool used for transmission of sidelink control information may be configured by a dedicated RRC signaling procedure.
- the sidelink control information may be transmitted through a resource scheduled by the base station 210 within a resource pool established by a dedicated RRC signaling procedure.
- a resource pool used for transmission of sidelink control information may be configured 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 and UE #6 236) within the resource pool established by the dedicated RRC signaling procedure or the broadcast RRC signaling procedure. It can be transmitted through a resource.
- a second communication node corresponding thereto is described as a method performed in the first communication node and a method (eg, signal transmission or reception) For example, receiving or transmitting 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. there is. Conversely, when the operation of UE #2 is described, UE #1 corresponding thereto may perform an operation corresponding to that of UE #2. In the embodiments described below, the operation of the vehicle may be the operation 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, or PHY (physical) signaling.
- a message used for higher layer signaling may be referred to as a "higher layer message” or “higher layer signaling message”.
- MAC messages e.g. MAC messages
- PHY PHY
- Higher-layer signaling may mean transmission and reception of system information (eg, master information block (MIB) and system information block (SIB)) and/or RRC messages.
- MAC signaling may mean a transmission and reception operation of a MAC control element (CE).
- PHY signaling may mean transmission and reception 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 may be 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), and the like.
- 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, PSFCH (physical sidelink feedback channel), and the like.
- a sidelink channel may refer to a sidelink channel including a sidelink signal mapped to specific resources within a corresponding sidelink channel.
- Sidelink communication may support a broadcast service, a multicast service, a groupcast service, and a unicast service.
- Sidelink communication may be performed based on a single SCI scheme or multi SCI scheme.
- data transmission eg, sidelink data transmission, sidelink-shared channel (SL-SCH) transmission
- SL-SCH sidelink-shared channel
- 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.
- SCI (eg, 1 st -stage SCI) may be transmitted on 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 includes priority information, frequency resource assignment information, time resource allocation information, resource reservation period information, demodulation reference signal (DMRS) pattern information, and second step SCI. It may include one or more information elements among format information, a beta_offset indicator, the number of DMRS ports, and modulation and coding scheme (MCS) information.
- the second step SCI includes HARQ processor identifier (ID), redundancy version (RV), source ID, destination ID, CSI request information, zone ID, and communication range requirements (communication range requirements) may include one or more information elements.
- SCI format 2-C may be used for decoding PSSCH and/or providing inter-UE steering information.
- “setting an operation means “setting information for the corresponding operation (eg, information element, parameter)” and/or “performing the corresponding operation”. It may mean that the "instructing information” is signaled. "Setting an information element (eg, parameter)” may mean that a corresponding information element is signaled.
- SI system information
- SIB system information block
- MIB master information block
- RRC Radio Resource Control
- CE MAC control element
- PHY PHY signaling
- 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
- transmission of SCI may include transmission of a first-stage SCI and/or a second-stage SCI.
- UE-A may refer to a UE transmitting inter-UE coordination information to UE-B.
- UE-A may be referred to as a first UE or a second UE.
- UE-A may transmit inter-UE coordination information to UE-B upon UE-B's explicit request.
- UE-A may transmit inter-UE coordination information to UE-B when condition(s) set by higher layer signaling are satisfied.
- UE-B may refer to a UE receiving inter-UE coordination information from UE-A.
- UE-B may be referred to as a first UE or a second UE. If the procedure for requesting inter-UE coordination information is enabled, UE-B may transmit a request for inter-UE coordination information to UE-A.
- UE-B may receive inter-UE coordination information from UE-A without requesting inter-UE coordination information. That is, when conditions (s) preset in UE-A are satisfied, UE-B may receive inter-UE coordination information from UE-A.
- FIG. 7 is a flowchart illustrating a first embodiment of a sidelink communication method.
- a communication system may include UE-A and UE-B, and sidelink communication may be performed based on resource allocation (RA) mode 2.
- RA mode 2 may be Sidelink TM #2 or #4 specified in Table 2.
- UE-A may transmit information helpful for resource selection (eg, inter-UE coordination information) to UE-B.
- UE-B may perform a resource sensing operation and/or a resource selection operation for sidelink communication.
- UE-B may perform a resource sensing operation and/or a resource selection operation based on the inter-UE coordination information received from UE-A.
- FIG. 7 defines sidelink communication between one UE-A and one UE-B, but the embodiment of FIG. Sidelink communication between a group A) and one UE-B", “Sidelink communication between one UE-A and a plurality of UE-Bs (eg, a UE-B group including one or more UE-Bs) ", and/or "sidelink communication between a plurality of UE-As (eg, UE-A group) and a plurality of UE-Bs (eg, UE-B group)".
- one UE-B may transmit a plurality of first signaling messages to the plurality of UE-As, and in each of the plurality of UE-As.
- a second signaling message may be received.
- one UE-A may receive a first signaling message from each of the plurality of UE-Bs, and may receive a first signaling message from each of the plurality of UE-Bs.
- a second signaling message may be transmitted.
- UE-B may generate a first signaling message, which is a signal requesting provision of inter-UE coordination information, and may transmit the first signaling message to UE-A (S701).
- Step S701 may be performed when an explicit request procedure for inter-UE coordination information is enabled by higher layer signaling.
- the first signaling message may be a first-level SCI and/or a second-level SCI (eg, SCI format 2-C).
- the first signaling message may be transmitted through PSCCH and/or PSSCH.
- the first signaling message (eg, the first step SCI and/or the second step SCI) may include a providing/requesting indicator indicating provision or request of inter-UE coordination information.
- the size of the offer/request indicator may be 1 bit.
- a provision/request indicator set to 0 may indicate that the corresponding SCI (eg, SCI format 2-C) is used to provide inter-UE coordination information.
- the provision/request indicator set to 1 may indicate that the corresponding SCI (eg, SCI format 2-C) is used to request inter-UE coordination information.
- the offer/request indicator included in the first signaling message may be set to 1
- the offer/request indicator included in the second signaling message may be set to 0.
- a reserved bit in the first signaling message eg, the first stage SCI or the second stage SCI
- a new first-level SCI and/or a new second-level SCI may be defined to request provision of inter-UE coordination information.
- the first signaling message may further include a resource set type (eg, a type of resource information).
- the size of the resource set type may be 1 bit.
- a resource set type set to 0 may indicate a preferred resource set.
- the first signaling message may request provision of preferred resource set information (eg, preferred resource information).
- a resource set type set to 1 may indicate a non-preferred resource set.
- the first signaling message may request provision of non-preferred resource set information (eg, non-preferred resource information).
- request for inter-UE coordination information indicating a preferred resource set or "request for inter-UE coordination information indicating a non-preferred resource set” " can be indicated.
- a preferred resource set and a preferred resource may be used in the same meaning, and a non-preferred resource set and a non-preferred resource may be used in the same meaning.
- UE-A may receive a first signaling message (eg, SCI format 2-C) from UE-B, and may check a provision/request indicator included in the first signaling message.
- UE-A may transmit a second signaling message including inter-UE coordination information to UE-B (S702).
- Step S702 may be performed based on the UE-B's request for inter-UE coordination information.
- UE-A sends inter-UE coordination information without requesting inter-UE coordination information from UE-B. can be sent to B.
- UE-A may transmit inter-UE coordination information to UE-B when condition(s) set by higher layer signaling are satisfied.
- UE-A may determine the preferred resource set (eg, preferred resource), and the information element(s) indicating the preferred resource set It is possible to generate inter-UE coordination information including.
- a preferred resource set may be determined within a resource domain (eg, time resource, frequency resource, resource pool).
- the resource region in which the preferred resource set is determined may be configured in the UE(s) by higher layer signaling of the base station.
- the information element(s) indicating the resource region in which the preferred resource set is determined may be included in the first signaling message of UE-B (eg, SCI format 2-C).
- the time resource may be a resource reservation period.
- a frequency resource may be one or more subchannels.
- the UE-A may determine the non-preferred resource set (eg, non-preferred resources), and the information element(s) indicating the non-preferred resource set It is possible to generate inter-UE coordination information including.
- the non-preferred resource set may be determined within a resource domain (eg, time resource, frequency resource, resource pool).
- the resource region in which the non-preferred resource set is determined may be configured in the UE(s) by higher layer signaling of the base station.
- the information element(s) indicating the resource region in which the non-preferred resource set is determined may be included in the first signaling message of UE-B (eg, SCI format 2-C).
- the time resource may be a resource reservation interval.
- a frequency resource can be one or more subchannels.
- the second signaling message may include inter-UE coordination information including information element(s) indicating a preferred resource set or a non-preferred resource set.
- the second signaling message may be a first-level SCI and/or a second-level SCI (eg, SCI format 2-C).
- the second signaling message may include a provision/request indicator indicating provision of inter-UE coordination information and a resource set type.
- UE-B may receive a second signaling message from UE-A and may check inter-UE coordination information included in the second signaling message. For example, when the offer/request indicator included in the second signaling message indicates provision of inter-UE coordination information, UE-B performs a decoding operation to obtain inter-UE coordination information from the second signaling message. can do. When the resource set type included in the second signaling message indicates the preferred resource set, the UE-B may determine that the inter-UE coordination information obtained from the second signaling message indicates the preferred resource type. When the resource set type included in the second signaling message indicates the non-preferred resource set, the UE-B may determine that the inter-UE coordination information obtained from the second signaling message indicates the non-preferred resource type. UE-B may perform resource sensing/selection in consideration of inter-UE coordination information (S703). In an embodiment, the resource sensing/selection operation may include a resource sensing operation and/or a resource selection operation.
- the inter-UE coordination information may include information element(s) indicating a preferred resource set and/or a non-preferred resource set.
- the UE-B may select resource(s) in the preferred resource set by performing a resource sensing/selection operation, and may perform sidelink communication using the selected resource(s).
- the UE-B may select resource(s) other than the non-preferred resource set by performing a resource sensing/selection operation, and may perform sidelink communication using the selected resource(s).
- the aforementioned first signaling message may include at least one of resource pool (RP) information, time resource information, and frequency resource information.
- the RP information may indicate a Tx RP allocated to UE-B.
- Tx RP of UE-B may be set by the base station.
- Time resource information may indicate a time resource sensed by UE-B or a time resource reserved by UE-B for data transmission.
- the time resource indicated by the time resource information may be a time resource within the Tx RP allocated to UE-B.
- UE-A may determine a preferred resource or a non-preferred resource within a time resource indicated by the time resource information.
- the time resource information may indicate a resource reservation period.
- the frequency resource information may indicate a frequency resource sensed by UE-B or a frequency resource reserved by UE-B for data transmission.
- the frequency resource indicated by the frequency resource information may be a frequency resource within the Tx RP allocated to UE-B.
- UE-B may determine a preferred resource or a non-preferred resource within a frequency resource indicated by the frequency resource information.
- Frequency resources may be set in units of subchannels, and frequency resource information may indicate the number of subchannels.
- the first signaling message may include information element(s) indicating all or some of the resources sensed by UE-B.
- the first signaling message may contain information element(s) indicating all or some of the resources reserved by UE-B.
- the resource information included in the first signaling message may indicate a resource region arbitrarily selected by UE-B.
- the resource information included in the first signaling message may indicate a resource region (eg, a resource window) in which the UE-B performs a resource sensing/selection operation.
- the resource information included in the first signaling message may indicate a resource region preferred by UE-B or a resource region not preferred by UE-B.
- the first signaling message may include one or more indication information defined in Table 3 below.
- each of indication information #1, indication information #2, and indication information #3 may be 1 bit.
- Each of indication information #1, indication information #2, and indication information #3 may have a first value or a second value. Each of the first value and the second value may be 0 or 1. For example, when the first value is 0, the second value may be 1. When the first value is 1, the second value may be 0.
- Indication information #1 may indicate whether the first signaling message (eg, SCI format 2-C) including the corresponding indication information #1 is an inter-UE coordination request signal.
- the inter-UE coordination request signal may be a signal requesting inter-UE coordination information.
- indication information #1 may indicate whether the first signaling message (eg, SCI format 2-C) including corresponding indication information #1 requests inter-UE coordination information.
- Indication information #1 set to a first value may indicate that the first signaling message transmitted by UE-B is an inter-UE coordination request signal.
- Indication information #1 set to the second value may indicate that the first signaling message transmitted by UE-B is not an inter-UE coordination request signal.
- the indication information #1 may be the aforementioned offer/request indicator.
- Indication information #2 may indicate the use of inter-UE coordination scheme 1 or inter-UE coordination scheme 2. Indication information #2 may be transmitted when both inter-UE coordination scheme 1 and inter-UE coordination scheme 2 are available. Whether to use inter-UE coordination scheme 1 and/or inter-UE coordination scheme 2 may be set by higher layer signaling. "When only one of Inter-UE coordination method 1 and Inter-UE coordination method 2 is available" or "When using one of Inter-UE coordination method 1 and Inter-UE coordination method 2 is set", Instruction information #2 may not be transmitted. Inter-UE coordination scheme 1 may be used to indicate a preferred resource (eg, preferred resource set) or a non-preferred resource (eg, non-preferred resource set). Inter-UE coordination scheme 2 may be used to indicate expected/potential resource conflicts or detected resource conflicts. Indication information #2 set to the first value may indicate use (or request) of inter-UE coordination scheme 1. Indication information #2 set to the second value may indicate use (or request) of inter-UE coordination scheme 2.
- Inter-UE coordination scheme 1 may be used to indicate a preferred resource (
- indication information #3 may be used to indicate a request for one inter-UE coordination information (eg, one resource type, one resource set type).
- the indication information #3 may indicate inter-UE coordination information according to the inter-UE coordination method indicated by indication information #2.
- indication information #2 is set to a first value
- indication information #3 set to a first value may indicate a request for a preferred resource (eg, a set of preferred resources)
- indication information #3 set to a second value may indicate a request for a non-preferred resource (eg, a non-preferred resource set).
- the indication information #3 set to the first value may indicate a request for predicted/potential resource collision information
- the indication information #3 set to the second value is the detected resource A request for collision information may be indicated.
- indication information #3 may indicate a request for inter-UE coordination information (eg, preferred resource set or non-preferred resource set) according to inter-UE coordination scheme 1.
- the indication information #3 may be of the aforementioned resource set type.
- the first signaling message may include resource information used by UE-A to transmit inter-UE coordination information.
- the first signaling message may include some indication information defined in Table 3. All or part of the indication information defined in Table 3 may be set by higher layer signaling, MAC signaling, or PHY signaling. All or part of the indication information defined in Table 3 can be operated in a fixed setting.
- the use (or transmission) of each indication information defined in Table 3 may be enabled or disabled by higher layer signaling. For example, "when the use of indication information #1 and #3 is enabled by higher layer signaling and the use of indication information #2 is disabled by higher layer signaling", the first signaling message is the indication information # 1 and 3 may be included, and indication information #2 may not be included.
- “Usage (or transmission) of indication information #1 is enabled by higher layer signaling” may mean that "a request for inter-UE coordination information is explicitly indicated”. "Use (or transmission) of indication information #1 is disabled by higher layer signaling (eg, use (or transmission) of indication information #1 is not enabled by higher layer signaling) " may mean that "a request for inter-UE coordination information is implicitly indicated.”
- the indication information #1 may be indicated in an implicit manner in addition to an explicit manner. "When indication information #1 is indicated in an implicit manner and preset condition(s) are satisfied", UE-A sends a second signaling message including inter-UE coordination information (e.g., SCI format 2- C) to UE-B.
- inter-UE coordination information e.g., SCI format 2- C
- the first signaling message may be transmitted based on a unicast method, a group cast method, and/or a broadcast method, which are SL transmission methods.
- UE-B may transmit the first signaling message to UE-A, which is a specific UE.
- a sequence eg, a scrambling sequence, a cyclic redundancy (CRC)
- CRC cyclic redundancy
- a check sequence for masking may be generated based on a UE-specific ID (identifier). That is, UE-B may generate a sequence using a UE-specific ID and may generate a first signaling message using the sequence.
- UE-A may perform a reception operation on the first signaling message using the UE-specific ID.
- FIG. 8 is a flowchart illustrating a second embodiment of a sidelink communication method.
- the communication system may include UE-A1, UE-A2, and UE-B.
- UE-A1 and UE-A2 may be configured as a UE group (eg, group-A).
- the UE group may include a plurality of UE-As (eg, UE-A1 and UE-A2) that receive the first signaling message from UE-B.
- a sequence eg, a scrambling sequence, a sequence for CRC masking
- a sequence for the first signaling message is a UE-specific ID or based on a group-specific ID.
- a group-specific ID may be set by the UE-B or the base station.
- the UE-B or the base station may determine one or more UE-As belonging to the UE group, set a group-specific ID for the UE group, and set the group-specific ID to at least one of higher-layer signaling, MAC signaling, or PHY signaling.
- One can be used to inform the UE(s) eg UE-A's belonging to the UE group).
- UE-A(s) may obtain a group-specific ID from either UE-B or the base station.
- UE-A(s) may perform a reception operation on the first signaling message using the group-specific ID.
- UE-B may generate a sequence based on the group-specific ID, and may generate a first signaling message based on the sequence.
- UE-B may transmit a first signaling message indicating a transmission request of inter-UE coordination information (S801).
- the first signaling message may be transmitted in a group cast method or a broadcast method.
- Each of UE-A1 and UE-A2 belonging to the UE group may perform a reception operation for the first signaling message using a group-specific ID.
- UE-A1 When the first signaling message is received from UE-B, UE-A1 may generate a second signaling message including inter-UE coordination information #1 and transmit the second signaling message to UE-B ( S802).
- UE-A2 may generate a second signaling message including inter-UE coordination information #2 and transmit the second signaling message to UE-B ( S803).
- UE-B may receive a second signaling message from a UE group (eg, UE-A1 and/or UE-A2), and inter-UE coordination information included in the second signaling message (eg, -UE coordination information #1 and/or inter-UE coordination information #2) may be obtained.
- UE-B may perform resource sensing/selection in consideration of inter-UE coordination information #1 and/or inter-UE coordination information #2 (S804).
- UE-B may perform sidelink communication using the resource determined in step S804.
- UE-B may transmit a first signaling message requesting transmission of inter-UE coordination information to unspecified UE-A(s).
- a sequence eg, a scrambling sequence, a sequence for CRC masking
- the specific ID may be a cell-specific ID, a resource pool (RP)-specific ID, and/or a UE-B-specific ID.
- the UE-B-specific ID may be a specific ID for UE-B transmitting the first signaling message.
- a specific ID may be set by the UE-B or the base station.
- the UE-B or the base station may set a specific ID for broadcast transmission, and may inform the UE(s) of the specific ID using at least one of higher layer signaling, MAC signaling, or PHY signaling.
- UE-A(s) may obtain a specific ID from UE-B or base station.
- UE-A(s) may perform a reception operation on the first signaling message using a specific ID.
- one common ID may be used for transmission of the first signaling message indicating a transmission request of inter-UE coordination information.
- a sequence eg, a scrambling sequence, a sequence for CRC masking
- the common ID may be set by the UE-B or the base station.
- the UE-B or the base station may set a common ID for unicast transmission, group cast transmission, and broadcast transmission, and use at least one of higher layer signaling, MAC signaling, or PHY signaling to set the common ID to the UE(s). can inform UE-A(s) may obtain a common ID from either UE-B or the base station.
- the UE-B(s) may perform a reception operation on the first signaling message using the common ID, and transmit inter-UE coordination information when the first signaling message requests transmission of inter-UE coordination information. can decide whether The first signaling message transmitted using the common ID includes a UE-specific ID, a group-specific ID, and/or SL- A specific ID may be further included.
- the SL-specific ID may refer to an ID set for communication between UE-B and the reception target UE(s).
- the SL-specific ID may be an L2 groupcast ID.
- UE-A may check the ID (eg, UE-specific ID, group-specific ID, and/or SL-specific ID) included in the first signaling message, and the checked ID may be set to the corresponding UE-A.
- a second signaling message including inter-UE coordination information may be transmitted to the UE-B if the ID corresponds.
- IDs are used for higher layer signaling, MAC It may be configured in each UE using at least one of signaling or PHY signaling.
- a reception target eg, UE or UE group
- a reception target of the first signaling message may be specified as some or all of the UE(s) that receive data transmitted by UE-B.
- a reception target of the first signaling message may include UE(s) that do not receive data transmitted by UE-B.
- UE-B may transmit the first signaling message to a reception target of data transmitted by a unicast method from the corresponding UE-B and to UE(s) other than the corresponding reception target.
- UE-B may transmit the same first signaling message (eg, the same transmission request information) in a group cast method.
- each of UE-A1 and UE-A2 may generate a second signaling message including inter-UE coordination information based on the same transmission request information and may transmit the second signaling message.
- FIG. 9 is a flowchart illustrating a third embodiment of a sidelink communication method.
- the communication system may include UE-A1, UE-A2, and UE-B.
- UE-B may transmit a first signaling message indicating a transmission request of inter-UE coordination information to UE-A1 (S901).
- UE-B may transmit a first signaling message indicating a transmission request of inter-UE coordination information to UE-A2 (S902).
- the first signaling message may be transmitted in a unicast manner.
- the first signaling message may include different transmission request information.
- UE-A1 may receive a first signaling message from UE-B, and may generate a second signaling message including inter-UE coordination information #1 based on the transmission request indicated by the first signaling message; , a second signaling message may be transmitted to UE-B (S903).
- UE-A2 may receive a first signaling message from UE-B, and may generate a second signaling message including inter-UE coordination information #2 based on the transmission request indicated by the first signaling message; , a second signaling message may be transmitted to UE-B (S904).
- the second signaling message may be generated based on different transmission request information.
- UE-B may receive the second signaling message from UE-A1 and may check inter-UE coordination information #1 included in the second signaling message.
- UE-B may receive the second signaling message from UE-A2 and may check inter-UE coordination information #2 included in the second signaling message.
- UE-B may perform a resource sensing/selection operation based on inter-UE coordination information #1 and/or inter-UE coordination information #2 (S905).
- UE-B may perform sidelink communication using the resource determined in step S905.
- UE-B may independently generate the first signaling message for each UE-A.
- resource information included in the first signaling message for UE-A1 may be different from resource information included in the first signaling message for UE-A2.
- the resource information may include information on resources sensed by UE-B, information on resources reserved by UE-B for data transmission, and/or information on a range of sensing resources used for data transmission by UE-B.
- the UE-A may determine a preferred resource and/or a non-preferred resource within resources indicated by the resource information included in the first signaling message, including inter-UE coordination information indicating the preferred resource and/or the non-preferred resource. may transmit a second signaling message to UE-B.
- an inter-UE coordination scheme and request information required for the inter-UE coordination scheme may be set independently (eg, differently). there is. For example, “when the first signaling message indicates inter-UE coordination scheme 1" or "when the first signaling message supports inter-UE coordination scheme 1", the first signaling message corresponds to inter-UE coordination scheme A transmission request of preferred resource information and/or non-preferred resource information according to method 1 may be indicated. If “the first signaling message indicates Inter-UE coordination scheme 2" or "the first signaling message supports Inter-UE coordination scheme 2", the first signaling message corresponds to Inter-UE coordination scheme 2 A transmission request of predicted/potential resource conflict information and/or detected resource conflict information may be indicated.
- UE-B may transmit the first signaling message to “part or all of UE(s) receiving data transmitted by UE-B in a groupcast method” and/or “UE-B transmits data in a groupcast method” may be transmitted to the UE(s) that do not receive the data.
- FIG. 10 is a flowchart illustrating a fourth embodiment of a sidelink communication method.
- the communication system may include UE group #1, UE group #2, and UE-B.
- UE group #1 may include one or more UE-As.
- UE group #1 may include one or more UEs receiving data transmitted by UE-B.
- UE group #2 may include one or more UE-As.
- UE group #2 may include “one or more UEs receiving data transmitted by UE-B” and “one or more UEs not receiving data transmitted by UE-B”.
- Step S1001 may be one group cast transmission.
- the first signaling message transmitted to UE group #1 and UE group #2 may include the same information element(s).
- the first signaling message transmitted to each of UE group #1 and UE group #2 may include different information element(s).
- the request information required for the inter-UE coordination scheme and/or the inter-UE coordination scheme in the first signaling message transmitted to UE group #1 is transmitted in the first signaling message transmitted to UE group #2. It may be different from the requested information required for the UE coordination scheme and/or the inter-UE coordination scheme.
- the first signaling message may include indication information for identifying information element(s) transmitted to each UE group.
- UE group #1 (eg, UE(s) belonging to UE group #1) may receive a first signaling message from UE-B, and in response to the first signaling message, inter-UE coordination information #1 A second signaling message including may be transmitted to UE-B (S1002).
- UE group #2 (eg, UE(s) belonging to UE group #2) may receive a first signaling message from UE-B, and in response to the first signaling message, inter-UE coordination information #2 A second signaling message including may be transmitted to UE-B (S1003).
- UE group #1 and UE group #2 may generate a second signaling message based on the same transmission request information included in the first signaling message.
- UE-B may receive a second signaling message from UE group #1 and may check inter-UE coordination information #1 included in the second signaling message.
- UE-B may receive a second signaling message from UE group #2 and may check inter-UE coordination information #2 included in the second signaling message.
- UE-B may perform resource sensing/selection based on inter-UE coordination information #1 and/or inter-UE coordination information #2 (S1004).
- UE-B may perform sidelink communication using the resource determined in step S1004.
- FIG. 11 is a flowchart illustrating a fifth embodiment of a sidelink communication method.
- the communication system may include UE group #1, UE group #2, and UE-B.
- UE group #1 may include one or more UE-As.
- UE group #1 may include one or more UEs receiving data transmitted by UE-B.
- UE group #2 may include one or more UE-As.
- UE group #2 may include “one or more UEs receiving data transmitted by UE-B” and “one or more UEs not receiving data transmitted by UE-B”.
- UE-B may transmit the first signaling message to UE group #1 in a group cast method (S1101). UE-B may transmit the first signaling message to UE group #2 using a group cast method (S1102). Each of the group cast transmission in step S1101 and the group cast transmission in step S1102 may be performed independently. Transmission request information included in the first signaling message transmitted in step S1101 may be set differently from transmission request information included in the first signaling message transmitted in step S1102.
- UE-B may independently generate a first signaling message for each UE group.
- resource information included in the first signaling message for UE group #1 may be different from resource information included in the first signaling message for UE group #2.
- the resource information may include information on resources sensed by UE-B, information on resources reserved by UE-B for data transmission, and/or information on a range of sensing resources used for data transmission by UE-B. .
- the inter-UE coordination scheme and the request information required for the inter-UE coordination scheme may be set independently (eg, differently). For example, “when the first signaling message indicates inter-UE coordination scheme 1" or "when the first signaling message supports inter-UE coordination scheme 1", the first signaling message corresponds to inter-UE coordination scheme A transmission request of preferred resource information and/or non-preferred resource information according to method 1 may be indicated. If “the first signaling message indicates Inter-UE coordination scheme 2" or "the first signaling message supports Inter-UE coordination scheme 2", the first signaling message corresponds to Inter-UE coordination scheme 2 A transmission request of predicted/potential resource conflict information and/or detected resource conflict information may be indicated.
- UE group #1 (eg, UE(s) belonging to UE group #1) may receive a first signaling message from UE-B, and in response to the first signaling message, inter-UE coordination information #1 A second signaling message including may be transmitted to UE-B (S1103).
- UE group #2 (eg, UE(s) belonging to UE group #2) may receive a first signaling message from UE-B, and in response to the first signaling message, inter-UE coordination information #2 A second signaling message including may be transmitted to UE-B (S1104).
- UE group #1 and UE group #2 may generate a second signaling message based on different transmission request information included in the first signaling message.
- UE-B may receive a second signaling message from UE group #1 and may check inter-UE coordination information #1 included in the second signaling message.
- UE-B may receive a second signaling message from UE group #2 and may check inter-UE coordination information #2 included in the second signaling message.
- UE-B may perform a resource sensing/selection operation based on inter-UE coordination information #1 and/or inter-UE coordination information #2 (S1105).
- UE-B may perform sidelink communication using the resource determined in step S1105.
- the UE-A(s) receiving the first signaling message may operate as follows for transmission of inter-UE coordination information.
- can UE-A may transmit the second signaling message based on transmission method #1 or transmission method #2 defined in Table 4 below.
- a transmission method of the second signaling message may be determined based on a cast type (eg, unicast, group cast, and/or broadcast) through which the first signaling message is transmitted.
- UE-A may determine a transmission method of the second signaling message based on Table 5 below.
- the base station and/or UE-B may transmit the information of Table 5 to the UE(s) using at least one of higher layer signaling, MAC signaling, or PHY signaling.
- the second signaling message may be transmitted based on transmission method #1.
- the reception target of the first signaling message is an unspecified UE, the second signaling message may be transmitted based on transmission method #2.
- various combinations may be set.
- Specific condition(s) for transmission method #2 may be indicated by the first signaling message.
- the specific condition(s) for transmission scheme #2 may be set in the UE(s) using at least one of higher layer signaling, MAC signaling, or PHY signaling.
- a specific condition for transmission method #2 may be a zone type. Zone types can be distinguished according to the distance between UE-A and UE-B. A zone type according to the distance between UE-A and UE-B may be set as shown in Table 6 below.
- the base station and/or UE-B may transmit the information of Table 6 to the UE(s) using at least one of higher layer signaling, MAC signaling, or PHY signaling.
- the distance between UE-A and UE-B may mean a communication range.
- UE-B may transmit the first signaling message including the zone type. For example, when the zone type included in the first signaling message indicates zone A, among the UE-As that have received the first signaling message, UE-A(s) belonging to zone A transmit inter-UE coordination information. It is possible to transmit a second signaling message including.
- the first signaling message may include location information of the UE-B transmitting the corresponding first signaling message.
- UE-A can identify a zone type (eg, zone A, zone B, or zone C) to which it belongs based on its own location and the location of UE-B indicated by the first signaling message.
- Information indicating the zone type and/or UE-B location information may be transmitted through SCI and/or MAC CE for the first signaling message.
- zone types may be classified based on received signal strength.
- a zone type according to received signal strength may be set as shown in Table 7 below.
- the base station and/or UE-B may transmit the information of Table 7 to the UE(s) using at least one of higher layer signaling, MAC signaling, or PHY signaling.
- UE-A may measure the received signal strength of a signal and/or channel received from UE-B, and based on the received signal strength, may determine the zone type to which the corresponding UE-A belongs.
- the received signal strength may be the received signal strength of the first signaling message.
- a monitoring period for receiving the second signaling message may be configured.
- the monitoring interval may be set by a time offset, and the time offset may be set by X ms (millisecond). X may be a natural number.
- the time offset may start from the transmission time of the first signaling message.
- UE-B may perform a reception operation (eg, monitoring operation) of the second signaling message during a monitoring period corresponding to a time offset from the transmission time of the first signaling message. For example, when the transmission time point of the first signaling message is t, UE-B may perform a reception operation of the second signaling message during t+X ms.
- the time offset may be set in units of time resources (eg, symbols, slots, or subframes). For example, the time offset can be set to X number of slots.
- the UE-B may receive the second signaling message in the time interval from slot #K (or slot #K+1) to slot #K+X.
- K may be a natural number.
- UE-B may perform resource sensing/selection based on inter-UE coordination information included in the second signaling message. and sidelink communication may be performed using the resource determined by the resource sensing/selection operation. If the second signaling message is not received in the above-described time interval (eg, monitoring interval), the UE-B may perform sidelink communication without the second signaling message (ie, without considering inter-UE coordination information).
- the time offset (eg, X ms, X slots) may be a value configured for reception and/or transmission of inter-UE coordination information (eg, the second signaling message) prior to transmission of data.
- the base station transmits information (eg, time offset, X ms, X slots) of a monitoring interval for receiving and/or transmitting the second signaling message using at least one of higher layer signaling, MAC signaling, and PHY signaling. may transmit to the UE(s).
- the UE(s) may receive information (eg, time offset, X ms, X slots) of a monitoring interval for receiving and/or transmitting the second signaling message from the base station.
- a plurality of time offsets may be configured in UE-B by at least one of higher layer signaling, MAC signaling, or PHY signaling, and UE-B may use one time offset among the plurality of time offsets. For example, UE-B may select one time offset from among a plurality of time offsets in consideration of data transmission time.
- the transmission time of data is "time resource used for data transmission” or “data transmission It can be set to a previous point in time of "available time resources”.
- the first signaling message transmitted by UE-B may include time offset information.
- information of the time offset may be transmitted to UE-A(s) using at least one of higher layer signaling, MAC signaling, or PHY signaling. If transmission of the second signaling message is impossible within the interval corresponding to the time offset from the time of reception of the first signaling message, UE-A may not transmit the second signaling message including inter-UE coordination information. When transmission of the second signaling message is possible within the interval corresponding to the time offset from the time of reception of the first signaling message, UE-A may transmit the second signaling message including inter-UE coordination information.
- the first signaling message may include resource information for transmission of the second signaling message.
- Resource information for transmission of the second signaling message may be set as shown in Table 8 below.
- the UE-A receiving the first signaling message may transmit a second signaling message including inter-UE coordination information using the PSFCH resource.
- the second signaling message may be transmitted based on the HARQ-ACK transmission scheme.
- information indicated by the corresponding second signaling message eg, inter-UE coordination information
- ACK Acknowledgment
- NACK Negative ACK
- NACK Negative ACK
- the base station and/or UE-B may transmit the information of Table 9 to the UE(s) using at least one of higher layer signaling, MAC signaling, or PHY signaling.
- the PSFCH resource for transmission of the second signaling message may be a resource (eg, time and / or frequency resource) configured for transmission of HARQ-ACK for the first signaling message.
- the PSFCH resource for transmission of the second signaling message may be a resource (eg, time and / or frequency resource) different from the resource configured for HARQ-ACK transmission for the first signaling message.
- the second signaling message when the first signaling message explicitly or implicitly indicates inter-UE coordination scheme 1, and the resource information provided by the second signaling message is preferred resource information, the second signaling message is ACK information can include When the first signaling message explicitly or implicitly indicates inter-UE coordination scheme 1 and the resource information provided by the second signaling message is non-preferred resource information, the second signaling message may include NACK information. there is.
- the first signaling message explicitly or implicitly indicates inter-UE coordination scheme 2
- the resource information provided by the second signaling message is predicted/potential resource collision information
- the corresponding second signaling message is ACK information
- the first signaling message explicitly or implicitly indicates inter-UE coordination scheme 2
- the second signaling message includes NACK information can do.
- the embodiments of Table 9 may be applied only to specific inter-UE coordination schemes.
- the second signaling message eg, inter-UE coordination information
- the embodiment of Table 9 can be applied only to Inter-UE coordination scheme 2.
- the first signaling message may explicitly or implicitly indicate inter-UE coordination scheme 2.
- the corresponding second signaling message may include ACK information.
- the corresponding second signaling message may include NACK information.
- the first signaling message may implicitly indicate inter-UE coordination scheme 2.
- the embodiments of Table 10 may be applied to a specific inter-UE coordination scheme and specific inter-UE coordination information requested by the specific inter-UE coordination scheme.
- the first signaling message may explicitly or implicitly indicate "request for inter-UE coordination scheme 2 and predicted/potential resource conflict information" or "request for inter-UE coordination scheme 2 and detected resource conflict information”. there is. In this case, whether a collision (eg, predicted/potential resource collision and/or detected resource collision) occurs may be indicated based on Table 11 or Table 12 below.
- UE-A when a collision occurs (eg, when resource collision information exists), UE-A may transmit a second signaling message including NACK information using PSFCH resources. In the embodiment of Table 11, when no collision occurs (eg, when resource collision information does not exist), UE-A may transmit the second signaling message including ACK information using PSFCH resources.
- UE-A when a collision occurs (eg, when resource collision information exists), UE-A may transmit a second signaling message including NACK information using PSFCH resources. In the embodiment of Table 12, when no collision occurs (eg, resource collision information does not exist), UE-A may not transmit (eg, the second signaling message).
- transmission of different ACK/NACK information according to inter-UE coordination information requested by inter-UE coordination scheme 2 can be configured.
- UE-A transmits a second message including NACK information. Signaling messages can be transmitted. If a predicted/potential resource collision does not occur, UE-A may not perform transmission (eg, the second signaling message).
- UE-A may transmit a second signaling message including ACK information. If the detected resource collision does not occur, UE-A may not perform transmission (eg, the second signaling message).
- the first signaling message may not explicitly indicate a transmission request of predicted/potential resource collision information and/or detected resource collision information for inter-UE coordination scheme 2.
- UE-A may select information that can be provided from among predicted/potential resource collision information and detected resource collision information, and may transmit a second signaling message including the selected information.
- the second signaling message may indicate predicted/potential resource conflict information or detected resource conflict information according to the embodiment of Table 13. The above-described operation may be applied identically or similarly to the embodiment according to inter-UE coordination scheme 1.
- the first signaling message When the first signaling message is transmitted in a group cast method, UE(s) belonging to the UE group that has received the first signaling message may transmit the second signaling message using the same PSFCH resource.
- the first signaling message is “request for inter-UE coordination scheme 2 and predicted/potential resource conflict information” or “request for inter-UE coordination scheme 2 and detected resource conflict information” " may be explicitly or implicitly indicated, and UE-A may transmit a second signaling message including NACK information using PSFCH resources when a collision indicated by the first signaling message occurs, and the UE -A may transmit a second signaling message including ACK information using PSFCH resources when a collision indicated by the first signaling message does not occur.
- Each UE-A belonging to the UE group may determine whether a collision indicated by the first signaling message has occurred.
- the corresponding UE-A may transmit a second signaling message including NACK information to UE-B using PSFCH resources.
- UE-B may receive a second signaling message from UE-A belonging to the UE group, and based on NACK information included in the second signaling message, it may be determined that a collision indicated by the first signaling message has occurred. .
- the same first signaling message or different first signaling messages may be transmitted to a plurality of UE-As.
- the same first signaling message or different first signaling messages include the same PSFCH resource information
- the plurality of second signaling messages will be transmitted using one PSFCH resource (eg, the same PSFCH resource).
- the first signaling message may include sensed resource information (eg, resource information #2 defined in Table 8) instead of PSFCH resource information.
- the UE-A(s) receiving the first signaling message may select a resource based on sensed resource information included in the corresponding first signaling message.
- UE-A(s) may select a resource by performing the resource sensing operation again.
- UE-A(s) may transmit the second signaling message using the selected resource.
- the sensed resource information may be dedicated resource information for transmission of the second signaling message.
- the sensed resource information may be target resource information for requesting inter-UE coordination 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 on a computer readable medium.
- Computer readable media may include program instructions, data files, data structures, etc. alone or in combination.
- Program instructions recorded on a computer readable medium may be specially designed and configured for the present invention or may be known and usable to those skilled in computer software.
- Examples of computer readable media include hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like.
- Examples of program instructions include high-level language codes that can be executed by a computer using an interpreter or the like as well as machine language codes generated by a compiler.
- the hardware device described above may be configured to operate with at least one software module to perform the operations of the present invention, and vice versa.
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Abstract
Description
Claims (20)
- 제1 UE(user equipment)의 방법으로서,인터(inter)-UE 조정(coordination) 정보의 전송 요청을 지시하는 제1 정보 요소를 포함하는 제1 시그널링 메시지를 생성하는 단계;상기 제1 시그널링 메시지를 전송하는 단계;상기 제1 시그널링 메시지의 전송 시점부터 제1 시간 구간 동안에 상기 인터-UE 조정 정보를 포함하는 제2 시그널링 메시지의 수신 동작을 수행하는 단계; 및상기 제2 시그널링 메시지가 수신된 경우, 상기 제2 시그널링 메시지에 포함된 상기 인터-UE 조정 정보를 고려하여 사이드링크 통신을 수행하는 단계를 포함하며,상기 제1 시간 구간 동안에 상기 제2 시그널링 메시지가 수신되지 않는 경우, 상기 사이드링크 통신은 상기 인터-UE 조정 정보의 고려 없이 수행되는, 제1 UE의 방법.
- 청구항 1에 있어서,상기 제1 시그널링 메시지는 유니캐스트(unicast) 방식, 그룹캐스트(groupcast) 방식, 또는 브로드캐스트(broadcast) 방식으로 전송되고, 상기 제1 시그널링 메시지가 상기 유니캐스트 방식으로 전송되는 경우에 상기 제1 시그널링 메시지는 UE-특정(specific) ID(identifier)에 기초하여 생성되고, 상기 제1 시그널링 메시지가 상기 그룹캐스트 방식으로 전송되는 경우에 상기 제1 시그널링 메시지는 그룹-특정 ID에 기초하여 생성되고, 상기 제1 시그널링 메시지가 상기 브로드캐스트 방식으로 전송되는 경우에 상기 제1 시그널링 메시지는 브로드캐스트 전송을 위한 ID에 기초하여 생성되는, 제1 UE의 방법.
- 청구항 1에 있어서,상기 제1 시그널링 메시지는 상기 제1 시간 구간을 지시하는 시간 오프셋(time offset)의 정보를 더 포함하는, 제1 UE의 방법.
- 청구항 1에 있어서,상기 제1 UE의 방법은,상기 제1 UE가 연결된 기지국으로부터 상기 제1 시간 구간을 지시하는 시간 오프셋의 정보를 수신하는 단계를 더 포함하는, 제1 UE의 방법.
- 청구항 1에 있어서,상기 제1 시그널링 메시지는 제2 UE 및 제3 UE 각각에 전송되고, 상기 제2 UE에 전송되는 상기 제1 시그널링 메시지와 상기 제3 UE에 전송되는 상기 제1 시그널링 메시지는 동일한 정보 요소들 또는 서로 다른 정보 요소들을 포함하는, 제1 UE의 방법.
- 청구항 1에 있어서,상기 제1 시그널링 메시지는 상기 인터-UE 조정 정보를 포함하는 상기 제2 시그널링 메시지의 전송 방식을 지시하는 제2 정보 요소를 더 포함하는, 제1 UE의 방법.
- 청구항 6에 있어서,상기 전송 방식은 제1 전송 방식 및 제2 전송 방식으로 분류되고, 상기 제1 전송 방식이 사용되는 경우에 상기 제2 시그널링 메시지는 상기 인터-UE 조정 정보가 존재하는 경우에 전송되고, 상기 제2 전송 방식이 사용되는 경우에 상기 제2 시그널링 메시지는 미리 설정된 조건이 만족하는 경우에 전송되는, 제1 UE의 방법.
- 청구항 7에 있어서,상기 미리 설정된 조건은 "상기 제1 UE와 상기 제1 시그널링 메시지를 수신하는 제2 UE 간의 거리가 제1 임계값 미만인 조건" 또는 "상기 제2 UE에서 수신되는 상기 제1 시그널링 메시지의 수신 세기가 제2 임계값 이상인 조건"인, 제1 UE의 방법.
- 청구항 1에 있어서,상기 제1 시그널링 메시지는 상기 제2 시그널링 메시지의 전송 자원을 지시하는 제3 정보 요소를 더 포함하고, 상기 전송 자원은 PSFCH(physical sidelink feedback channel) 자원 또는 상기 제1 UE에 의해 센싱된 자원인, 제1 UE의 방법.
- 청구항 9에 있어서,상기 제2 시그널링 메시지가 상기 PSFCH 자원을 사용하여 전송되는 경우, 상기 제2 시그널링 메시지는 ACK(acknowledgement) 정보 또는 NACK(negative ACK) 정보를 포함하고, 상기 ACK 정보 및 상기 NACK 정보 각각은 상기 제1 시그널링 메시지에 의해 지시되는 선호(preferred) 자원, 비선호(non-preferred) 자원, 예측된/잠재적(expected/potential) 자원 충돌(conflict), 또는 검출된(detected) 자원 충돌을 지시하는, 제1 UE의 방법.
- 제2 UE(user equipment)의 방법으로서,인터(inter)-UE 조정(coordination) 정보의 전송 요청을 지시하는 제1 정보 요소 및 상기 인터-UE 조정 정보의 전송 방식을 지시하는 제2 정보 요소를 포함하는 제1 시그널링 메시지를 제1 UE로부터 수신하는 단계;상기 전송 방식에 따른 조건이 만족하는 경우, 상기 전송 요청에 따른 상기 인터-UE 조정 정보를 생성하는 단계; 및상기 인터-UE 조정 정보를 포함하는 제2 시그널링 메시지를 상기 제1 UE에 전송하는 단계를 포함하는, 제2 UE의 방법.
- 청구항 11에 있어서,상기 조건은 "상기 제1 UE와 제2 UE 간의 거리가 제1 임계값 미만인 조건" 또는 "상기 제1 시그널링 메시지의 수신 세기가 제2 임계값 이상인 조건"인, 제2 UE의 방법.
- 청구항 11에 있어서,상기 제1 시그널링 메시지는 상기 제2 시그널링 메시지의 전송 자원을 지시하는 제3 정보 요소를 더 포함하고, 상기 전송 자원은 PSFCH(physical sidelink feedback channel) 자원 또는 상기 제1 UE에 의해 센싱된 자원인, 제2 UE의 방법.
- 청구항 13에 있어서,상기 제2 시그널링 메시지가 상기 PSFCH 자원을 사용하여 전송되는 경우, 상기 제2 시그널링 메시지는 ACK(acknowledgement) 정보 또는 NACK(negative ACK) 정보를 포함하고, 상기 ACK 정보 및 상기 NACK 정보 각각은 상기 제1 시그널링 메시지에 의해 지시되는 선호(preferred) 자원, 비선호(non-preferred) 자원, 예측된/잠재적(expected/potential) 자원 충돌(conflict), 또는 검출된(detected) 자원 충돌을 지시하는, 제2 UE의 방법.
- 청구항 11에 있어서,상기 제1 시그널링 메시지는 시간 오프셋의 정보를 더 포함하며, 상기 제2 시그널링 메시지는 상기 제1 시그널링 메시지의 수신 시점부터 상기 시간 오프셋에 상응하는 시간 구간 내에 전송되는, 제2 UE의 방법.
- 청구항 11에 있어서,상기 제1 시그널링 메시지는 유니캐스트(unicast) 방식, 그룹캐스트(groupcast) 방식, 또는 브로드캐스트(broadcast) 방식으로 전송되고, 상기 제1 시그널링 메시지가 상기 유니캐스트 방식으로 전송되는 경우에 상기 제1 시그널링 메시지는 UE-특정(specific) ID(identifier)에 기초하여 수신되고, 상기 제1 시그널링 메시지가 상기 그룹캐스트 방식으로 전송되는 경우에 상기 제1 시그널링 메시지는 그룹-특정 ID에 기초하여 수신되고, 상기 제1 시그널링 메시지가 상기 브로드캐스트 방식으로 전송되는 경우에 상기 제1 시그널링 메시지는 브로드캐스트 전송을 위한 ID에 기초하여 수신되는, 제2 UE의 방법.
- 제1 UE(user equipment)는,프로세서; 및상기 프로세서에 의해 실행되는 하나 이상의 명령들을 저장하는 메모리를 포함하며,상기 하나 이상의 명령들은,인터(inter)-UE 조정(coordination) 정보의 전송 요청을 지시하는 제1 정보 요소를 포함하는 제1 시그널링 메시지를 생성하고;상기 제1 시그널링 메시지를 제2 UE에 전송하고;상기 제1 시그널링 메시지의 전송 시점부터 제1 시간 구간 동안에 상기 인터-UE 조정 정보를 포함하는 제2 시그널링 메시지의 수신 동작을 수행하고; 그리고상기 제2 UE로부터 상기 제2 시그널링 메시지가 수신된 경우, 상기 제2 시그널링 메시지에 포함된 상기 인터-UE 조정 정보를 고려하여 사이드링크 통신을 수행하도록 실행되며,상기 제1 시간 구간 동안에 상기 제2 시그널링 메시지가 수신되지 않는 경우, 상기 사이드링크 통신은 상기 인터-UE 조정 정보의 고려 없이 수행되는, 제1 UE.
- 청구항 17에 있어서,상기 제1 시간 구간을 지시하는 시간 오프셋(time offset)의 정보는 상기 제1 시그널링 메시지에 포함되거나 상기 제1 UE가 연결된 기지국에 의해 설정되는, 제1 UE.
- 청구항 17에 있어서,상기 제1 시그널링 메시지는 상기 인터-UE 조정 정보를 포함하는 상기 제2 시그널링 메시지의 전송 방식을 지시하는 제2 정보 요소를 더 포함하고, 상기 전송 방식은 제1 전송 방식 및 제2 전송 방식으로 분류되고, 상기 제1 전송 방식이 사용되는 경우에 상기 제2 시그널링 메시지는 상기 인터-UE 조정 정보가 존재하는 경우에 전송되고, 상기 제2 전송 방식이 사용되는 경우에 상기 제2 시그널링 메시지는 미리 설정된 조건이 만족하는 경우에 전송되는, 제1 UE.
- 청구항 17에 있어서,상기 제1 시그널링 메시지는 상기 제2 시그널링 메시지의 전송 자원을 지시하는 제3 정보 요소를 더 포함하고, 상기 전송 자원은 PSFCH(physical sidelink feedback channel) 자원 또는 상기 제1 UE에 의해 센싱된 자원이고,상기 제2 시그널링 메시지가 상기 PSFCH 자원을 사용하여 전송되는 경우, 상기 제2 시그널링 메시지는 ACK(acknowledgement) 정보 또는 NACK(negative ACK) 정보를 포함하고, 상기 ACK 정보 및 상기 NACK 정보 각각은 상기 제1 시그널링 메시지에 의해 지시되는 선호(preferred) 자원, 비선호(non-preferred) 자원, 예측된/잠재적(expected/potential) 자원 충돌(conflict), 또는 검출된(detected) 자원 충돌을 지시하는, 제1 UE.
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EP22853424.4A EP4366411A1 (en) | 2021-08-04 | 2022-08-02 | Method and device for requesting and transmitting inter-ue coordination information in sidelink communication |
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APPLE: "Discussion on Inter-UE Coordination", 3GPP DRAFT; R2-2103854, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. Online; 20210412 - 20210420, 2 April 2021 (2021-04-02), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052175181 * |
LG ELECTRONICS: "Discussion on physical layer design considering sidelink DRX operation", 3GPP DRAFT; R1-2007897, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. E-Meeting; 20201026 - 20201113, 24 October 2020 (2020-10-24), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051946545 * |
MODERATOR (LG ELECTRONICS): "Feature lead summary for AI 8.11.1.2 Inter-UE coordination for Mode 2 enhancements", 3GPP DRAFT; R1-2104103, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210412 - 20210420, 21 April 2021 (2021-04-21), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051997558 * |
MODERATOR (OPPO): "FL summary for AI 8.11.2.1 – resource allocation for power saving", 3GPP DRAFT; R1-2009584, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20201026 - 20201113, 17 November 2020 (2020-11-17), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051955617 * |
SAMSUNG: "On Inter-UE Coordination for Mode2 Enhancements", 3GPP DRAFT; R1-2105335, 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 , XP052011379 * |
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