WO2023171218A1 - 無線端末及びその方法 - Google Patents

無線端末及びその方法 Download PDF

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Publication number
WO2023171218A1
WO2023171218A1 PCT/JP2023/004130 JP2023004130W WO2023171218A1 WO 2023171218 A1 WO2023171218 A1 WO 2023171218A1 JP 2023004130 W JP2023004130 W JP 2023004130W WO 2023171218 A1 WO2023171218 A1 WO 2023171218A1
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WIPO (PCT)
Prior art keywords
sidelink
transmission
psfch
carrier
wireless terminal
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English (en)
French (fr)
Japanese (ja)
Inventor
暁秋 林
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NEC Corp
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NEC Corp
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Priority to US18/841,730 priority Critical patent/US20250168867A1/en
Priority to JP2024505964A priority patent/JPWO2023171218A1/ja
Publication of WO2023171218A1 publication Critical patent/WO2023171218A1/ja
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/40—Resource management for direct mode communication, e.g. D2D or sidelink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present disclosure relates to direct communication between wireless terminals (device-to-device (D2D) communication), and particularly relates to the use of multiple carriers in direct communication.
  • D2D device-to-device
  • D2D communications can be integrated with or supported by cellular networks.
  • Proximity-based services ProSe
  • 3GPP® Third Generation Partnership Project
  • V2X Vehicle-to-Everything
  • D2D communications supported by cellular networks can also be used for other applications and services besides V2X services (e.g. public safety applications).
  • the interface between 3GPP wireless terminals (i.e., User Equipment (UEs)) used for the control plane and user plane for D2D communication is called the PC5 interface (or reference point).
  • D2D communication on the PC5 interface is called sidelink communication.
  • the PC5 interface may be based on Evolved Universal Terrestrial Radio Access (E-UTRA) sidelink capabilities and may further be based on 5G New Radio (NR) sidelink capabilities.
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • NR 5G New Radio
  • D2D communication (or sidelink communication) on the E-UTRA-PC5 (or Long Term Evolution (LTE) based PC5) interface is connectionless, i.e. in broadcast mode at the Access Stratum (AS) layer.
  • AS Access Stratum
  • sidelink communication on the NR PC5 interface supports unicast mode, groupcast mode, and broadcast mode at the AS layer.
  • LTE sidelink communication is called, for example, LTE sidelink communication.
  • Sidelink communication on the NR PC5 interface is called, for example, NR sidelink communication.
  • 3GPP specifications specify architectural enhancements to facilitate vehicular communications for cellular V2X services (see, e.g., References 1, 2, and 3).
  • LTE sidelink communication and NR sidelink communication play an important role in realizing cellular V2X communication.
  • AS functionality using E-UTRA technology including LTE sidelink communication to enable V2X communication between UEs or V2X communication on the E-UTRA-PC5 interface It is called LTE V2X sidelink communication.
  • AS functionality using NR technology, including NR sidelink communication to enable V2X communication between UEs, or V2X communication on the NR PC5 interface is referred to as NR V2X sidelink communication or simply NR sidelink communication. .
  • 3GPP Release 15 supports carrier aggregation (CA) and multicarrier operation for LTE sidelink communication (see Non-Patent Documents 1 and 4).
  • CA carrier aggregation
  • 3GPP Release 18 3GPP will discuss Sidelink Evolution. This includes support for carrier aggregation for NR sidelink communications and support for sidelinks on unlicensed spectrum (see Non-Patent Document 5).
  • Patent Documents 1, 2, and 3 disclose sidelink (SL) carrier aggregation, that is, carrier aggregation for SL communication, and in particular between UEs and between UEs and radio access networks (e.g. regarding SL carrier aggregation). , base stations).
  • SL sidelink
  • Patent Document 1 describes that the UE may send SL carrier aggregation settings related to addition, release, and change of secondary SLs to peer UEs (for example, FIGS. 3 and 4 of Patent Document 1, (See Figures 5 and 10).
  • the SL carrier aggregation configuration may relate to addition, release, modification of secondary SLs, and may include a set of carrier frequencies and deactivation timer information.
  • the SL carrier aggregation settings include reception (Rx) or transmission (Tx) indication, primary SL or secondary SL indication, carrier aggregation type (e.g., data duplication or data division), V2X service type, synchronization type, It may also include a primary SL index (carrier index), a secondary SL index (carrier index), SL transmission or reception resource allocation information, and the like.
  • Patent Document 1 describes that after PC5 carrier aggregation is configured, the UE may notify the base station of this (for example, see FIG. 6 of Patent Document 1).
  • the notification message may include at least one of a set of carrier frequency information, a deactivation timer, and a peer UE identifier.
  • the notification message further includes indication of reception (Rx) or transmission (Tx), indication of primary or secondary SL, type of carrier aggregation (e.g., data duplication or data splitting), V2X It may include service type, synchronization type, primary SL index (carrier index), secondary SL index (carrier index), SL transmission or reception resource allocation information, and the like.
  • Patent Document 1 describes that the UE may transmit a request for SL carrier aggregation configuration between the UE and a peer UE to the base station, or the base station may generate the configuration and provide it to the UE. This is described (for example, see FIG. 9 of Patent Document 1). Furthermore, Patent Document 1 describes that the request message is optional and that the base station may provide the SL carrier aggregation settings to the UE regardless of whether the request message is received from the UE.
  • Patent Document 1 describes that before setting up SL carrier aggregation, UEs may directly exchange information regarding their respective SL carrier aggregation capabilities (for example, (See FIG. 13 of Patent Document 1).
  • the SL carrier aggregation capability includes one or both of SL band combination information and SL band and Uu band combination information.
  • Uu is the air interface between the UE and the base station.
  • the band combination information of the UE indicates a list of carriers on which the UE can operate simultaneously and the band of each carrier.
  • the UE may indicate whether it supports both transmission (Tx) and reception (Rx) on each carrier, or only one of transmission (Tx) and reception (Rx).
  • Patent Document 2 discloses that a UE receives a Radio Resource Control (RRC) signal (e.g., RRC Connection Reconfiguration) including a command to add or release a component carrier of V2X carrier aggregation from a wireless wide area network (WAN).
  • RRC Radio Resource Control
  • WAN wireless wide area network
  • Patent Document 3 discloses that a first wireless terminal receives a sidelink message including sidelink capability information of a second wireless terminal from the second wireless terminal via a sidelink channel, and It is described that an uplink message including capability information is sent to a base station (see, for example, FIG. 25 of Patent Document 3).
  • the sidelink capability information of the second wireless terminal includes whether the second wireless terminal supports sidelink multiple carrier operation (e.g., sidelink carrier aggregation, sidelink multiple carriers, sidelink multi-carrier); Indicates supported/operating sidelinks (e.g., LTE, 5G, etc.), available bands, whether the second wireless terminal supports unlicensed bands (or unlicensed spectrum), etc. It's okay.
  • sidelink multiple carrier operation e.g., sidelink carrier aggregation, sidelink multiple carriers, sidelink multi-carrier
  • Indicates supported/operating sidelinks e.g., LTE, 5G, etc.
  • available bands whether the second wireless terminal supports unlicensed bands (or unlicensed spectrum
  • the base station determines configuration parameters for sidelink communication between the first and second wireless terminals based on sidelink capability information of the second wireless terminal, and sets the configuration parameters to the first wireless terminal. It may also be sent to a wireless terminal.
  • the configuration parameters may be sent in an RRC message, Medium Access Control (MAC) Control Element (CE), or Physical Downlink Control Channel (PDCCH) transmission (e.g., Downlink Control Information (DCI)).
  • MAC Medium Access Control
  • CE Control Element
  • PDCCH Physical Downlink Control Channel
  • DCI Downlink Control Information
  • Patent Document 3 discloses that a first wireless terminal receives a sidelink message including band combination information of a second wireless terminal from the second wireless terminal via a sidelink channel, and receives an uplink message including the band combination information. It is described that a link message (e.g., RRC message) is transmitted to a base station (see, for example, FIG. 26 of Patent Document 3).
  • the band combination information of the second wireless terminal may indicate one or more bands that are permitted to be used simultaneously for sidelink communication at the second wireless terminal.
  • the second wireless terminal's band combination information may indicate whether the second wireless terminal supports multiple sidelink carriers (e.g., multi-carrier operation, sidelink carrier aggregation).
  • the base station determines or assigns resources corresponding to the multiple carriers. Good too.
  • the base station sends configuration parameters for sidelink communication between the first and second wireless terminals to the first wireless terminal.
  • the configuration parameter may indicate a sidelink resource assignment.
  • the radio resource allocation may indicate a first sidelink radio resource of a first carrier and a second sidelink radio resource of a second carrier.
  • the first wireless terminal transmits the first transport block to the second wireless terminal via the first sidelink radio resource and the second transport block via the second sidelink radio resource. may be sent.
  • Carrier aggregation at the D2D interface or sidelink interface (e.g., PC5 interface) between wireless terminals can also be called multicarrier operation.
  • a UE with limited transmission capabilities may be referred to as a limited Tx capability UE.
  • HARQ hybrid automatic repeat request
  • PSFCH Physical Sidelink Feedback Channel
  • a UE may receive multiple Physical Sidelink Shared Channels (PSSCH) on multiple receive sidelink component carriers. In this case, it is not clear how the UE transmits multiple HARQ feedbacks regarding PSSCH reception on multiple received component carriers.
  • PSSCH Physical Sidelink Shared Channels
  • One of the objectives that the embodiments disclosed herein seek to achieve is to solve at least one of a plurality of problems, including the above-mentioned problems regarding carrier aggregation at a D2D interface between wireless terminals.
  • the purpose of the present invention is to provide devices, methods, and programs that contribute to this goal. It should be noted that this objective is only one of the objectives that the embodiments disclosed herein seek to achieve. Other objects or objects and novel features will become apparent from the description of this specification or the accompanying drawings.
  • a wireless terminal includes at least one wireless transceiver and at least one processor coupled to the at least one wireless transceiver.
  • the at least one processor is configured to receive a first sidelink transmission from a peer wireless terminal on a first sidelink carrier and a second sidelink transmission from the peer wireless terminal on a second sidelink carrier. configured.
  • the at least one processor is configured to transmit first HARQ feedback regarding the first sidelink transmission and second HARQ feedback regarding the second sidelink transmission to multiple users within the same time slot of the first sidelink carrier. is configured to transmit using the PSFCH resources of
  • a method performed by a wireless terminal includes the following steps: (a) receiving a first sidelink transmission from a peer wireless terminal on a first sidelink carrier; (b) receiving a second sidelink transmission from the peer wireless terminal on a second sidelink carrier; Transmitting first HARQ feedback regarding the first sidelink transmission and second HARQ feedback regarding the second sidelink transmission using a plurality of PSFCH resources within the same time slot of the first sidelink carrier. do.
  • a wireless terminal includes at least one wireless transceiver and at least one processor coupled to the at least one wireless transceiver.
  • the at least one processor is configured to receive a first sidelink transmission from a peer wireless terminal on a first sidelink carrier and a second sidelink transmission from the peer wireless terminal on a second sidelink carrier. configured.
  • the at least one processor is configured such that the first PSFCH transmission on the first sidelink carrier for HARQ feedback regarding the first sidelink transmission is configured to If the second PSFCH transmission on the second sidelink carrier overlaps in time with the second PSFCH transmission on the second sidelink carrier, the second PSFCH transmission on the second sidelink carrier is configured to be delayed to a subsequent PSFCH transmission occasion. Ru.
  • a method performed by a wireless terminal includes the steps of: (a) receiving a first sidelink transmission from a peer wireless terminal on a first sidelink carrier; (b) receiving a second sidelink transmission from the peer wireless terminal on a second sidelink carrier; (c) a first PSFCH transmission on the first sidelink carrier for HARQ feedback regarding the first sidelink transmission is connected to the second sidelink for HARQ feedback regarding the second sidelink transmission; If it overlaps in time with a second PSFCH transmission on a carrier, the second PSFCH transmission on the second sidelink carrier is delayed to a subsequent PSFCH transmission occasion.
  • a wireless terminal includes at least one wireless transceiver and at least one processor coupled to the at least one wireless transceiver.
  • the at least one processor is configured to receive a first sidelink transmission from a peer wireless terminal on a first sidelink carrier and a second sidelink transmission from the peer wireless terminal on a second sidelink carrier. configured.
  • the at least one processor is configured such that the first PSFCH transmission on the first sidelink carrier for HARQ feedback regarding the first sidelink transmission is configured to If the time overlaps with the second PSFCH transmission on the second sidelink carrier, the mobile terminal is configured to select whether to perform the first PSFCH transmission or the second PSFCH transmission.
  • a method performed by a wireless terminal includes the steps of: (a) receiving a first sidelink transmission from a peer wireless terminal on a first sidelink carrier; (b) receiving a second sidelink transmission from the peer wireless terminal on a second sidelink carrier; (c) a first PSFCH transmission on the first sidelink carrier for HARQ feedback regarding the first sidelink transmission is connected to the second sidelink for HARQ feedback regarding the second sidelink transmission; If the time overlaps with the second PSFCH transmission on the carrier, it is selected whether to perform the first PSFCH transmission or the second PSFCH transmission.
  • the program includes a group of instructions (software code) for causing the computer to perform the method according to the second, fourth, or sixth aspect described above when the program is loaded into the computer.
  • FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to an embodiment.
  • 1 is a diagram illustrating a configuration example of a wireless communication system according to an embodiment.
  • FIG. 2 is a diagram illustrating the control plane AS protocol stack for RRC on the PC5 interface;
  • FIG. 3 shows the control plane AS protocol stack for PC5-S at the PC5 interface;
  • FIG. 3 is a diagram illustrating the user plane AS protocol stack at the PC5 interface.
  • FIG. 3 is a diagram showing an example of the structure of NR sidelink layers 2 and 1 in which carrier aggregation is configured. It is a flowchart which shows an example of operation of UE concerning an embodiment. It is a flowchart which shows an example of operation of UE concerning an embodiment.
  • FIG. 2 is a block diagram illustrating a configuration example of a UE according to an embodiment.
  • FIG. 2 is a block diagram illustrating a configuration example of a radio access network node according to an embodiment.
  • FIG. 2 is a block diagram illustrating a configuration example of a core network node and an application server according to an embodiment.
  • if means “when,” “at or around the time,” and “after,” depending on the context. "after”, “upon”, “in response to determining", “in accordance with a determination", or “detecting” may be interpreted to mean “in response to detecting”. These expressions may be interpreted to have the same meaning, depending on the context.
  • FIG. 1 shows a configuration example of a wireless communication system according to a plurality of embodiments.
  • Each element (network function) shown in Figure 1 can be implemented, for example, as a network element on dedicated hardware, as a software instance running on dedicated hardware, or as an application platform. It can be implemented as an instantiated virtualization function.
  • a Radio Access Network (RAN) node e.g., gNB 2 manages a cell 21 and uses cellular communication technology (i.e., NR Radio Access Technology) to connect multiple wireless terminals including UE1A and UE1B.
  • UEs 1 and cellular communication (101 and 102) can be performed.
  • Cellular communication 101 uses an air interface (e.g., Uu interface) between RAN node 2 and UE 1A.
  • cellular communication 102 uses the air interface (e.g., Uu interface) between RAN node 2 and UE 1B.
  • UE 1A may be located in one of two adjacent cells managed by different RAN nodes 2, and UE 1B may be located in the other cell.
  • UE 1A and the UE 1B may be located outside the coverage by one or more RAN nodes 2 (i.e., partial coverage, out-of-coverage).
  • Each of the UE1A and UE1B has at least one radio transceiver, performs cellular communication (101 or 102) with the RAN node 2, and communicates on the inter-UE direct interface (i.e., NR PC5 interface or NR side link) 103. It is configured to perform D2D communication (i.e., sidelink communication).
  • the sidelink communication includes unicast mode communication (sidelink unicast), and may further include one or both of groupcast mode communication and broadcast mode communication.
  • the interface between 3GPP wireless terminals (i.e., UEs) used for the control plane and user plane for D2D communication is called the PC5 interface (or reference point).
  • D2D communication on the PC5 interface is called sidelink communication.
  • the PC5 interface can be based on E-UTRA sidelink capabilities and can also be based on 5G NR sidelink capabilities.
  • D2D communication (or sidelink communication) on the E-UTRA-PC5 (or LTE-based PC5) interface is connectionless, i.e. in broadcast mode at the AS layer.
  • sidelink communication on the NR PC5 interface supports unicast mode, groupcast mode, and broadcast mode at the AS layer.
  • sidelink communications between UE1A and UE1B may be used for cellular V2X services and V2X communications.
  • the UEs 1A and 1B and the RAN node 2 shown in FIG. 1 may be used in a 5G system providing V2X communication on the PC5.
  • Figure 2 shows an example of a non-roaming 5G system architecture for V2X communication on PC5.
  • Each element (network function) shown in Figure 2 can be implemented, for example, as a network element on dedicated hardware, as a software instance running on dedicated hardware, or as an application platform. It can be implemented as an instantiated virtualization function.
  • the main reference points (or interfaces) shown in FIG. 2 are discussed below.
  • UE1 when describing matters common to a plurality of UEs including UE1A and UE1B, UE1 will be simply referred to using reference numeral 1.
  • the V1 reference point is a reference point between the V2X application (e.g., V2X application 11A or V2X application 11B) in the UE1 (e.g., UE1A or UE1B) and the V2X application in the V2X application server 61.
  • V2X application server 61 is located in data network (DN) 50.
  • the V5 reference point is the reference point between the V2X applications of two UEs1 (e.g., UE1A and UE1B).
  • the PC5 reference point is a reference point between UEs (e.g., UE1A and UE1B) and includes NR based PC5.
  • the Uu reference point is a reference point between the UE (e.g., UE1A) and the NG-RAN 20. Although illustration is omitted in FIG. 2, as already explained, the UE 1B may also communicate with the NG-RAN 20 via the Uu reference point.
  • the N1 reference point is the reference point between the UE1 (e.g., UE1A) and the Access and Mobility management Function (AMF) 41 in the 5G Core Network (5GC) 40. It may be used to send parameters from AMF 41 to UE 1 and to send UE 1's V2X capabilities and PC5 capabilities for V2X communication from UE 1 to AMF 41.
  • the N2 reference point is between NG-RAN 20 and AMF 41.
  • the N2 reference point may be used to send V2X policies and parameters from AMF 41 to NG-RAN 20.
  • AMF 41 is one of the network function nodes in the control plane of 5GC 40.
  • AMF 41 terminates a single signaling connection (i.e., N1 NAS signalling connection) with UE1 (e.g., UE1A) and provides registration management, connection management, and mobility management.
  • UE1 e.g., UE1A
  • NF network function
  • NF consumers e.g., Session Management Function (SMF)42
  • SMS Session Management Function
  • Namf interface a based interface
  • the NF services provided by AMF41 are: It includes a communication service (Namf_Communication).
  • the communication service enables the NF consumer (e.g., SMF 42) to communicate with the UE 1 or the NG-RAN 20 via the AMF 41.
  • the N3 reference point is a reference point between the NG-RAN 20 and the User Plane Function (UPF) 43 in 5GC.
  • the N6 reference point is a reference point between UPF43 and DN50.
  • the UPF 43 is one of the network function nodes in the user plane of the 5GC 40. UPF 43 processes and forwards user data. The functionality of UPF 43 is controlled by SMF 42 via the N4 reference point.
  • UPF 43 may include multiple UPFs interconnected via the N9 reference point.
  • the UE 1A in order to enable the V2X application 11B in the UE 1A to communicate with the V2X application in the V2X application server 61, the UE 1A establishes a path, association, and session via the Uu reference point, the N3 reference point, and the N6 reference point. , or use a connection.
  • the 5G system of FIG. 2 may provide a Network Exposure Function (NEF) service to enable communication between one or more network functions within the 5GC 40 and the V2X application server 61.
  • NEF 46 is one of the network function nodes in the control plane of 5GC 40. NEF46 supports the exposure of services and capabilities from the 5G system to application and network functions inside and outside the operator network.
  • the N33 reference point is the reference point between the NEF 46 and the application function (e.g. V2X application server 61).
  • the NEF 46 provides NF services to NF consumers (e.g. V2X application server 61) on a service-based interface (i.e., Nnef interface).
  • the service provided by the NEF 46 may be used by the V2X application server 61 to update the V2X service related information of the 5GC 40.
  • the NEF 46 may store V2X service related information in the Unified Data Repository (UDR) 45 directly via the N37 reference point or via the Policy Control Function (PCF) 44.
  • UDR Unified Data Repository
  • PCF Policy Control Function
  • the control plane Access Stratum (AS) protocol stack for Sidelink Control Channel (SCCH) for Radio Resource Control (RRC) includes RRC, Packet Data Convergence Protocol (PDCP), Radio Link Control (RLC), and Medium Access Control (MAC) sublayers and Physical (PHY) layer.
  • the SCCH is a sidelink logical channel for transmitting control information (i.e., PC5-RRC and PC5-S messages) from a UE (e.g., UE1A) to another UE(s)1 (e.g., UE1B).
  • the PC5 interface 103 supports the PC5 Signalling (PC5-S) protocol.
  • PC5-S is located above the PDCP, RLC, and MAC sublayers as well as the physical layer.
  • PC5-S is used for control plane signaling on the PC5 interface 103 for secure unicast layer 2 links (or PC5 unicast links).
  • PC5-S provides signaling to establish, modify, and release PC5 unicast links.
  • the PC5 unicast link between UE1A and UE1B is associated with the Application Layer ID and Layer-2 ID of UE1A and the Application Layer ID and Layer-2 ID of UE1B.
  • PC5 unicast links are bi-directional.
  • UE1A can send application data (e.g., V2X service data, public safety service data) to UE1B over the PC5 unicast link with UE1B, and UE1B can also send application data to UE1A. It can be sent over the PC5 unicast link.
  • application data e.g., V2X service data, public safety service data
  • a PC5-RRC connection is a logical connection between two UEs1 for a pair of Source Layer-2 ID and Destination Layer-2 ID.
  • a PC5-RRC connection is considered to be established after the corresponding PC5 unicast link is established.
  • the PC5-RRC connection is established in response to the establishment of the corresponding PC5 unicast link.
  • UE1 RRC layer
  • SL SRB sidelink signaling radio bearer
  • the UE1 RRC layer
  • the UE1 RRC layer
  • FIG. 5 shows the AS user plane protocol stack for the Sidelink Traffic Channel (STCH).
  • STCH is a sidelink logical channel for transmitting user data (e.g., V2X service data, public safety service data) from UE1 (e.g., UE1A) to other UE(s)1 (e.g., UE1B). It is.
  • the protocol stack includes Service Data Adaptation Protocol (SDAP), PDCP, RLC, and MAC sublayers as well as a physical layer.
  • SDAP Service Data Adaptation Protocol
  • PDCP Packet Control Protocol
  • RLC Radio Link Control Protocol
  • MAC sublayers as well as a physical layer.
  • NR sidelink communication on the NR PC5 interface 103 supports two resource allocation modes: mode 1 and mode 2.
  • RAN node 2 performs resource allocation. For example, the RAN node 2 allocates or schedules SL radio resources to the UE 1 using the NR Uu interface 101.
  • Resource allocation according to mode 1 includes dynamic grants and configured grants.
  • UE1 In case of dynamic grant, UE1 needs to request resources from RAN node 2 for transmission of every single transport block. More specifically, UE1 transmits a MAC Control Element (CE) (i.e., Sidelink BSR MAC CE) indicating a sidelink buffer status report (Buffer Status Report (BSR)) to an Uplink Shared Channel (UL-SCH) and The RAN node 2 sends Downlink Control Information (DCI) indicating the dynamic sidelink grant to the UE 1 via the Physical Downlink Control Channel (PDCCH). .
  • CE MAC Control Element
  • DCI Downlink Control Information
  • a dynamic sidelink grant provides resource allocation for the transmission (and retransmission) of one transport block. Note that if sidelink carrier aggregation, which will be described below, is configured, the dynamic sidelink grant may provide resource allocation of one transport block per sidelink (component) carrier.
  • the RAN node 2 grants UE1 periodic sidelink resources that are semi-statically configured by RRC. More specifically, the UE 1 may transmit UE assistance information regarding the traffic pattern of sidelink communication to the RAN node 2. Such UE assistance information, or sidelink traffic pattern information sent in the UE assistance information, may be referred to as configured grant assistance information.
  • Sidelink traffic pattern information (or configured grant assistance information) may include, for example, maximum transport block size based on observed traffic patterns, estimated timing of packet arrival on sidelink logical channels, and estimates on sidelink logical channels. It may also indicate the data arrival cycle.
  • the UE 1 transmits UE assistance information including sidelink traffic pattern information using an RRC message (e.g., UE assistance information message).
  • the RAN node 2 may consider the sidelink traffic pattern information received from the UE 1 and generate the configured grant.
  • the RAN node 2 sends the configured grant to the UE 1 using an RRC message (e.g. RRCReconfiguration message).
  • the configured grant indicates the allocation of time and frequency resources and the periodicity of the resource allocation.
  • the RAN node 2 sets the configured grant to the UE 1 via RRC signaling and activates or deactivates the configured grant via DCI signaling. do.
  • UE1 can use the periodic resources allocated in the configured grant only after it is activated by RAN node 2 and until it is deactivated.
  • UE1 autonomously selects resources based on sensing by UE1. Sensing is performed in a preconfigured resource pool. UE1 may select these resources for sidelink transmissions and retransmissions if they are not used by other UEs for high priority traffic. UE1 may perform a certain number of transmissions and retransmissions on the selected resource until a cause for resource reselection is triggered.
  • UE1A and UE1B support carrier aggregation (CA) on the NR PC5 interface (or NR sidelink) 103.
  • UE1A and UE1B support NR sidelink carrier aggregation, that is, carrier aggregation for NR sidelink communication.
  • Sidelink carrier aggregation can also be called multi-carrier operation.
  • Sidelink carrier aggregation allows UE1A and UE1B to communicate between each other on multiple sidelink carriers. Similar to the terminology in the Uu interface, multiple sidelink carriers used in sidelink carrier carrier aggregation may be referred to as component carriers.
  • one or more of the sidelink carriers belong to a licensed spectrum (licensed band) licensed to RAN Node 2 (or NG-RAN 20) or its operator, and one or more of the other sidelink carriers belong to The above may belong to the unlicensed spectrum.
  • the unlicensed spectrum may be ITS spectrum for intelligent transportation systems (ITS).
  • UE1A and UE1B support sidelink carrier aggregation in unicast transmission.
  • UE1A and UE1B may support sidelink carrier aggregation in groupcast transmission.
  • UE1A and UE1B may support sidelink carrier aggregation in broadcast transmission.
  • one or both of UE1A and UE1B may not necessarily be able to transmit simultaneously on multiple sidelink carriers. In other words, one or both of UE1A and UE1B may not support transmission within the same time slot on multiple sidelink carriers.
  • a UE with limited transmission capabilities in this manner may be referred to as a limited Tx capability UE.
  • the limited Tx capability may be due to the number of transmit chains of UE1 being smaller than the number of configured transmit sidelink carriers.
  • the limited Tx capability may be due to UE1 not supporting the configured transmit sidelink carrier band combination.
  • the limited Tx capability may be due to the time required for switching the transmit chain of UE1.
  • the limited Tx capability may be due to the inability of the UE1 to meet Radio Frequency (RF) requirements, such as due to power spectral density (PSD) imbalance.
  • RF Radio Frequency
  • PSD power spectral density
  • one or both of UE1A and UE1B does not necessarily need to be able to receive simultaneously on multiple sidelink carriers.
  • one or both of UE1A and UE1B may not support reception within the same time slot on multiple sidelink carriers.
  • the UE 1 whose reception function is limited in this way may be referred to as a limited Rx capability UE.
  • FIG. 6 shows an example of the structure of NR sidelink layers 2 and 1 in which carrier aggregation is configured.
  • Sidelink layer 2 includes a MAC sublayer 601, an RLC sublayer 602, a PDCP sublayer 603, and an SDAP sublayer 604.
  • sidelink carrier aggregation is a concept of the MAC sublayer 601 and the physical layer 620, and is not applied to layers higher than the RLC sublayer 602.
  • a PC5-RRC message regarding sidelink carrier aggregation may be introduced.
  • the physical layer 620 supports multiple sidelink carriers. If the UE supports transmission within the same time slot on multiple sidelink carriers, the physical layer 620 transmits one transport block (or MAC Protocol Data Unit (PDU)) on each sidelink carrier in one time slot. ) can be sent. Physical layer 620 offers transport channels to MAC sublayer 601 .
  • transport block or MAC Protocol Data Unit (PDU)
  • the MAC sublayer 601 provides one MAC entity for transmission and reception on multiple sidelink carriers.
  • the MAC entity provides a hybrid automatic repeat request (HARQ) entity for each sidelink carrier.
  • HARQ hybrid automatic repeat request
  • One HARQ entity maintains multiple HARQ processes, allowing transmissions to occur continuously on corresponding sidelink carriers while waiting for HARQ feedback regarding the success or failure of previous transmissions.
  • the MAC sublayer 601 provides logical channels to the RLC sublayer 602.
  • the MAC sublayer 601 provides mapping between logical channels and transport channels and multiplexes MAC Service Data Units (SDUs) belonging to one or different logical channels.
  • Transport channels used in NR sidelink include Sidelink Shared Channel (SL-SCH) and Sidelink Broadcast Channel (SL-BCH).
  • Logical channels used in the NR sidelink include Sidelink Control Channel (SCCH), Sidelink Traffic Channel (STCH), and Sidelink Broadcast Control Channel (SBCCH).
  • SCCH is a control channel and is mapped to SL-SCH.
  • STCH is a traffic channel and is mapped to SL-SCH like SCCH.
  • SBCCH is a control channel and is mapped to SL-BCH.
  • the MAC sublayer 601 provides scheduling for the NR sidelink.
  • the scheduling includes priority handling among multiple logical channels by logical channel prioritization.
  • the MAC sublayer transmits on multiple sidelink carriers in the same time slot.
  • a plurality of transport blocks (MAC PDUs) are provided to the physical layer 620 via a plurality of transport channels (i.e., SL-SCH) associated with each of a plurality of sidelink carriers.
  • Each grant may be a resource allocation mode 1 dynamic or configured grant.
  • the MAC entity if the MAC entity is configured with sidelink resource allocation mode 2 to transmit using a resource pool, the MAC entity generates a sidelink grant selected based on random selection or sensing in that resource pool. You may.
  • the RLC sublayer 602 provides RLC channels to the PDCP sublayer 603.
  • RLC sublayer 602 supports three transmission modes: Acknowledged Mode (AM), Unacknowledged Mode (UM), and Transparent Mode (TM).
  • AM and UM the RLC sublayer 602 provides segmentation of RLC SDUs.
  • AM the RLC sublayer 602 provides ARQ (retransmission of RLC SDUs or RLC SDU segments).
  • the PDCP sublayer 603 provides data radio bearers (DRBs) to the SDAP sublayer 604.
  • DRBs data radio bearers
  • the PDCP sublayer 603 receives user plane data for DRBs from the SDAP sublayer 604 and provides header compression, integrity protection, ciphering, etc.
  • the PDCP sublayer 603 provides signaling radio bearers (SRBs) to upper layers (i.e., PC5-S layer, PC-5 RRC layer).
  • SRBs signaling radio bearers
  • the PDCP sublayer 603 receives control plane data (i.e., PC5-S messages and PC5-RRC messages) of SRBs from the PC5-S layer and PC-5 RRC layer, and performs integrity protection and encryption. (ciphering), etc.
  • the SDAP sublayer 604 provides handling of Quality of Service (QoS) flows.
  • QoS flows may be Internet Protocol (IP) flows, i.e., IP packets.
  • IP Internet Protocol
  • the QoS flows may be non-IP flows, ie, non-IP packets.
  • SDAP sublayer 604 provides mapping between QoS flows and SL DRBs. There is one SDAP entity for each destination and one of unicast, groupcast, and broadcast associated with that destination.
  • HARQ feedback is used in unicast and group cast. Sent on Physical Sidelink Feedback Channel (PSFCH).
  • the receiving UE e.g., UE1B
  • receives unicast or group cast from the transmitting UE e.g., UE1A
  • a set of Physical Resource Blocks (PRBs) included in the PSFCH symbol that can be used for the PSFCH is indicated using a bitmap.
  • PRBs Physical Resource Blocks
  • Code division multiplexing (CDM) using cyclic shift codes (i.e., Zadoff-Chu sequences) is used to distinguish between ACK and NACK feedback.
  • CDM is used to multiplex multiple PSFCH transmissions of multiple receiving UEs into one PRB. That is, each PSFCH is mapped to time resources (i.e., PSFCH symbols), frequency resources (i.e., one PRB), and code resources (i.e., Zadoff-Chu sequence) within a slot.
  • the receiving UE (e.g., UE1B) performs Physical Sidelink Feedback Channel (PSFCH) transmission in response to the PSSCH received several slots ago. How many slots later a UE that has received a PSSCH transmission in a certain slot can transmit HARQ feedback for that PSSCH transmission depends on the period of the PSFCH symbol, and also depends on the period of the PSSCH symbol in which a UE that has received a PSSCH transmission can transmit HARQ feedback for that PSSCH transmission. Depends on the minimum time gap between slots containing PSFCH.
  • resources for PSFCH are configured periodically, for example, at a period of 1, 2, or 4 slots. In other words, within the resource pool, there is a slot with a PSFCH every 1, 2, or 4 slots.
  • a minimum number of slots (i.e., minimum time gap) between a slot with a PSSCH transmission and a slot containing a PSFCH for HARQ feedback for that PSSCH transmission is set.
  • the minimum time gap is, for example, 2 or 3.
  • the settings include the settings of PRBs used for PSFCH transmission and reception (e.g., sl-PSFCH-RB-Set), the settings of the PSFCH period (e.g., sl-PSFCH-Period), and the settings of the minimum time gap (e.g. , SL-MinTimeGapPSFCH) can be included in the sidelink resource pool configuration (e.g., SL-PSFCH-Config).
  • PRBs used for PSFCH transmission and reception e.g., sl-PSFCH-RB-Set
  • the settings of the PSFCH period e.g., sl-PSFCH-Period
  • the settings of the minimum time gap e.g. , SL-MinTimeGapPSFCH
  • SL-MinTimeGapPSFCH can be included in the sidelink resource pool configuration (e.g., SL-PSFCH-Config).
  • Sidelink resource pool settings are the sidelink common settings (e.g., SL-BWP in SL-ConfigCommonNR) that are broadcast in system information (e.g., System Information Block 12 (SIB12)). -ConfigCommon).
  • the sidelink resource pool configuration e.g., SL-BWP-PoolConfig
  • the sidelink resource pool configuration can be configured in the sidelink configuration (e.g., SL-BWP- PoolConfig).
  • the sidelink resource pool configuration (e.g., SL-BWP-PoolConfigCommon) can be included in the sidelink configuration (e.g., SL-BWP-PoolConfig in SL-PreconfigurationNR) that is preconfigured in the UE.
  • the receiving UE transmits the PSFCH in the first slot that contains the PSFCH resource and is located at least the number of slots specified by the resource pool's minimum time gap setting (e.g., sl-MinTimeGapPSFCH) from the last slot of PSSCH reception. Therefore, if the PSFCH period is 4 slots, HARQ feedback for PSSCH transmission in 4 PSSCH slots may be transmitted in multiple PRBs in one PSFCH symbol in one slot.
  • the resource pool's minimum time gap setting e.g., sl-MinTimeGapPSFCH
  • This embodiment provides improvements regarding carrier aggregation on the NR sidelink. Specifically, the present embodiment relates to the transmission of HARQ feedback for PSSCH reception on multiple sidelink carriers.
  • the configuration and operation of the wireless communication system and network element (or apparatus, node, device, or network function) according to this embodiment may be similar to the examples described with reference to FIGS. 1 to 6. .
  • FIG. 7 shows an example of the operation of the UE 1B.
  • UE1B may be a UE with limited transmission functions. More specifically, UE 1B may not be able to transmit on the first and second sidelink carriers simultaneously in the time domain.
  • UE1B receives a first sidelink transmission (i.e., PSSCH) from peer UE1A on a first sidelink carrier, and receives a second sidelink transmission (i.e., PSSCH) from peer UE1A on a second sidelink carrier. i.e., PSSCH).
  • the first sidelink transmission may be transmitted in the same time slot (i.e., slot or subframe) as the second sidelink transmission, or may be transmitted in a different time slot.
  • These sidelink transmissions may be unicast or groupcast.
  • the first sidelink carrier may belong to a licensed spectrum and the second sidelink carrier may belong to an unlicensed spectrum.
  • the unlicensed spectrum may be ITS spectrum.
  • the UE 1B transmits the first HARQ feedback regarding the first sidelink transmission and the second HARQ feedback regarding the second sidelink transmission to multiple PSFCH resources within the same time slot of the first sidelink carrier. Send using .
  • the second HARQ feedback for the second sidelink transmission is transmitted on a PSFCH symbol of a first sidelink carrier different from the second sidelink carrier on which the second sidelink transmission took place.
  • the structure of the slots in which the Physical Sidelink Control Channel (PSCCH), PSSCH, and PSFCH are transmitted may be expanded or improved.
  • the PSSCH resources for the first HARQ feedback and the PSSCH resources for the second HARQ feedback are located in different symbols, different resource blocks, or different symbols and different resource blocks within the same time slot. It's okay.
  • the UE 1B may determine multiple PSFCH resources for the first and second HARQ feedback based on the resource pool configuration of the first sidelink carrier.
  • the resource pool configuration of the first sidelink carrier consists of the arrangement of multiple PSFCH symbols used for the first HARQ feedback for sidelink transmission on the first sidelink carrier and the arrangement of multiple PSFCH symbols used for the first HARQ feedback for sidelink transmission on the first sidelink carrier and may show a constellation of multiple PSFCH symbols used for second HARQ feedback for sidelink transmission of .
  • the PSFCH configuration (e.g., SL-PSFCH-Config) included in the resource pool configuration of the first sidelink carrier specifies the PRBs used for PSFCH transmission and reception for the first HARQ feedback. It may include settings (e.g., sl-PSFCH-RB-Set) and PSFCH period settings (e.g., sl-PSFCH-Period).
  • the PSFCH configuration includes the configuration of PRBs used for PSFCH transmission and reception for the second HARQ feedback (e.g., sl-PSFCH-RB-Set-secondarycarrier) and the configuration of the PSFCH cycle (e.g., sl- PSFCH-Period-secondary carrier).
  • the minimum time gap setting (e.g., sl-MinTimeGapPSFCH) may be common to the first and second HARQ feedback.
  • the PSFCH configuration is configured in addition to the minimum time gap configuration for the first HARQ feedback (e.g., sl-MinTimeGapPSFCH), as well as the minimum time gap configuration for the second HARQ feedback (e.g., sl-MinTimeGapPSFCH). sl-MinTimeGapPSFCH-secondarycarrier).
  • the PSFCH period (e.g., 12) for the second HARQ feedback may be an integer multiple of the PSFCH period (e.g., 4) for the first HARQ feedback.
  • the resource pool configuration of the first sidelink carrier may be preconfigured in non-volatile memory in the Mobile Equipment (ME) of the UE 1B or in the Universal Subscriber Identity Module (USIM).
  • UE 1B may receive the resource pool configuration from the core network nodes (e.g., AMF 41, PCF 44) via the N1 reference point between AMF 41 and UE 1B.
  • the UE 1A may receive the resource pool settings from the V2X application server 61 via the V1 reference point between the UE 1B and the V2X application server 61.
  • the UE 1B may receive the resource pool configuration of the first sidelink carrier from the NG-RAN 20 (e.g., RAN node 2).
  • the UE1 transmits HARQ feedback regarding the PSSCH or transport block received via the second sidelink carrier to a It can be transmitted using the PSFCH resource of one sidelink carrier.
  • UE1 can send cross-carrier HARQ feedback. This can contribute to avoiding frequent loss of HARQ feedback when UE1 is a UE with limited transmission capabilities.
  • This embodiment provides improvements regarding carrier aggregation on the NR sidelink. Specifically, the present embodiment relates to the transmission of HARQ feedback for PSSCH reception on multiple sidelink carriers.
  • the configuration and operation of the wireless communication system and network element (or apparatus, node, device, or network function) according to this embodiment may be similar to the examples described with reference to FIGS. 1 to 6. .
  • FIG. 8 shows an example of the operation of the UE 1B.
  • UE1B may be a UE with limited transmission functions. More specifically, UE 1B may not be able to transmit on the first and second sidelink carriers simultaneously in the time domain.
  • Step 801 is similar to step 701 in FIG. Specifically, UE1B receives a first sidelink transmission (i.e., PSSCH) from peer UE1A on a first sidelink carrier, and receives a second sidelink transmission from peer UE1A on a second sidelink carrier. (i.e., PSSCH).
  • the first sidelink transmission may be transmitted in the same slot as the second sidelink transmission, or may be transmitted in a different slot.
  • These sidelink transmissions may be unicast or groupcast.
  • the first sidelink carrier may belong to a licensed spectrum and the second sidelink carrier may belong to an unlicensed spectrum.
  • the unlicensed spectrum may be ITS spectrum.
  • a first PSFCH transmission on a first sidelink carrier for HARQ feedback on a first sidelink transmission is transmitted on a second sidelink carrier for HARQ feedback on a second sidelink transmission. If it overlaps in time with the second PSFCH transmission, UE 1B delays the second PSFCH transmission on the second sidelink carrier to the next and subsequent PSFCH transmission opportunities. For example, if the second PSFCH transmission on the second sidelink carrier and the first PSFCH transmission on the first sidelink carrier are within the same slot, the UE 1B PSFCH transmission may be delayed to the next and subsequent PSFCH transmission opportunities.
  • How much to delay the second PSFCH transmission may be predefined in the 3GPP specifications.
  • a setting indicating how much to delay the second PSFCH transmission may be preset in a non-volatile memory in the Mobile Equipment (ME) of the UE 1B or in the Universal Subscriber Identity Module (USIM).
  • UE1B may receive the configuration from the core network nodes (e.g., AMF41, PCF44) via the N1 reference point between AMF41 and UE1B.
  • the UE 1A may receive the resource pool settings from the V2X application server 61 via the V1 reference point between the UE 1B and the V2X application server 61.
  • the UE 1B When the UE 1B is within the coverage of the NG-RAN 20 (e.g., RAN node 2), the UE 1B receives a configuration from the NG-RAN 20 (e.g., RAN node 2) indicating how much to delay the second PSFCH transmission. Good too.
  • the NG-RAN 20 e.g., RAN node 2
  • UE1 realizes that the second PSFCH transmission on the second sidelink carrier is temporally different from the first PSFCH transmission on the first sidelink carrier. If there is overlap, the second PSFCH transmission on the second sidelink carrier may be delayed to a subsequent PSFCH transmission opportunity. This can contribute to avoiding frequent loss of HARQ feedback when UE1 is a UE with limited transmission capabilities.
  • ⁇ Third embodiment> This embodiment provides improvements regarding carrier aggregation on the NR sidelink. Specifically, the present embodiment relates to the transmission of HARQ feedback for PSSCH reception on multiple sidelink carriers.
  • the configuration and operation of the wireless communication system and network element (or apparatus, node, device, or network function) according to this embodiment may be similar to the examples described with reference to FIGS. 1 to 6. .
  • FIG. 9 shows an example of the operation of the UE 1B.
  • UE1B may be a UE with limited transmission functions. More specifically, UE 1B may not be able to transmit on the first and second sidelink carriers simultaneously in the time domain.
  • Step 901 is similar to step 701 in FIG. 7 and step 801 in FIG. 8.
  • UE1B receives a first sidelink transmission (i.e., PSSCH) from peer UE1A on a first sidelink carrier, and receives a second sidelink transmission from peer UE1A on a second sidelink carrier. (i.e., PSSCH).
  • the first sidelink transmission may be transmitted in the same slot as the second sidelink transmission, or may be transmitted in a different slot.
  • These sidelink transmissions may be unicast or groupcast.
  • the first sidelink carrier may belong to a licensed spectrum and the second sidelink carrier may belong to an unlicensed spectrum.
  • the unlicensed spectrum may be ITS spectrum.
  • a first PSFCH transmission on a first sidelink carrier for HARQ feedback on a first sidelink transmission is transmitted on a second sidelink carrier for HARQ feedback on a second sidelink transmission. If the time overlaps with the second PSFCH transmission, the UE 1B selects whether to perform the first PSFCH transmission or the second PSFCH transmission.
  • the UE 1B performs the first PSFCH transmission or the second sidelink transmission based on the priority of the first sidelink transmission (PSSCH transmission) and the priority of the second sidelink transmission (PSSCH transmission). It is also possible to select whether to perform the second PSFCH transmission. Specifically, the UE 1B may select to perform PSFCH transmission related to side link transmission (PSSCH transmission) with higher priority.
  • the priority of PSSCH transmission may be based on the priority of the transport block, specifically the priority of the logical channels contained in the transport block.
  • UE 1B performs the first PSFCH transmission or the second PSFCH transmission based on the Channel Busy Ratio (CBR) of the first sidelink carrier and the CBR of the second sidelink carrier. You may choose to do so. Specifically, the UE 1B may choose to perform PSFCH transmission using a sidelink carrier with a lower CBR.
  • CBR Channel Busy Ratio
  • the UE 1B performs the first PSFCH transmission based on the Sidelink Reference Signal Received Power (SL-RSRP) of the first sidelink carrier and the SL-RSRP of the second sidelink carrier. It is also possible to select whether to perform the second PSFCH transmission. Specifically, the UE 1B may choose to perform PSFCH transmission on a sidelink carrier with better SL-RSRP.
  • SL-RSRP Sidelink Reference Signal Received Power
  • the UE 1B may choose to perform PSFCH transmission on one predetermined sidelink carrier. For example, the UE 1B may always select the first PSFCH transmission on the first sidelink carrier and not perform the second PSFCH transmission on the second sidelink carrier.
  • UE1 realizes that the second PSFCH transmission on the second sidelink carrier is temporally different from the first PSFCH transmission on the first sidelink carrier. If they overlap, only one of the PSFCHs can be transmitted. This can contribute to resolving conflicts in PSFCH transmission when UE1 is a UE with limited transmission capabilities.
  • the RAN node 2 determines whether the arrangement of periodic slots containing PSFCH symbols in the resource pool of the first sidelink carrier is the same as the arrangement of periodic slots containing PSFCH symbols in the resource pool of the second sidelink carrier.
  • the resource pool configurations of the first sidelink carriers may be created such that all or at least some of them do not overlap.
  • the RAN node 2 may provide the resource pool configuration of the first sidelink carrier created in this way to the UE 1. This may reduce or eliminate situations where the second PSFCH transmission on the second sidelink carrier overlaps in time with the first PSFCH transmission on the first sidelink carrier.
  • FIG. 10 is a block diagram showing an example of the configuration of UE1.
  • a Radio Frequency (RF) transceiver 1001 performs analog RF signal processing to communicate with other UEs 1 and RAN nodes 2.
  • RF transceiver 1001 may include multiple transceivers. Analog RF signal processing performed by RF transceiver 1001 includes frequency upconversion, frequency downconversion, and amplification.
  • RF transceiver 1001 is coupled with antenna array 1002 and baseband processor 1003.
  • RF transceiver 1001 receives modulation symbol data (or OFDM symbol data) from baseband processor 1003, generates a transmit RF signal, and provides the transmit RF signal to antenna array 1002. Further, RF transceiver 1001 generates a baseband reception signal based on the reception RF signal received by antenna array 1002 and supplies this to baseband processor 1003.
  • RF transceiver 1001 may include an analog beamformer circuit for beamforming.
  • the analog beamformer circuit includes, for example, multiple phase shifters and multiple power amplifiers.
  • the baseband processor 1003 performs digital baseband signal processing (data plane processing) and control plane processing for wireless communication.
  • Digital baseband signal processing consists of (a) data compression/decompression, (b) data segmentation/concatenation, (c) transmission format (transmission frame) generation/decomposition, and (d) transmission path encoding/decoding. , (e) modulation (symbol mapping)/demodulation, and (f) generation of OFDM symbol data (baseband OFDM signal) by Inverse Fast Fourier Transform (IFFT).
  • IFFT Inverse Fast Fourier Transform
  • control plane processing includes layer 1 (e.g., transmit power control), layer 2 (e.g., radio resource management, and hybrid automatic repeat request (HARQ) processing), and layer 3 (e.g., attach, mobility, and call management). including communication management (signaling related to communication).
  • layer 1 e.g., transmit power control
  • layer 2 e.g., radio resource management, and hybrid automatic repeat request (HARQ) processing
  • layer 3 e.g., attach, mobility, and call management
  • communication management signalaling related to communication.
  • digital baseband signal processing by the baseband processor 1003 includes a Service Data Adaptation Protocol (SDAP) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer, and a Physical (PHY) layer signal processing may also be included.
  • SDAP Service Data Adaptation Protocol
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access Control
  • PHY Physical
  • the control plane processing by the baseband processor 1003 may include processing of Non-Access Stratum (NAS) protocol, Radio Resource Control (RRC) protocol, MAC Control Elements (CEs), and Downlink Control Information (DCIs).
  • NAS Non-Access Stratum
  • RRC Radio Resource Control
  • CEs MAC Control Elements
  • DCIs Downlink Control Information
  • the control plane processing may include processing of PC5-S signaling and PC5-RRC signaling.
  • the baseband processor 1003 may perform multiple input multiple output (MIMO) encoding and precoding for beamforming.
  • MIMO multiple input multiple output
  • the baseband processor 1003 includes a modem processor (e.g., Digital Signal Processor (DSP)) that performs digital baseband signal processing, and a protocol stack processor (e.g., Central Processing Unit (CPU) or Micro Processing Unit (CPU)) that performs control plane processing. MPU)).
  • DSP Digital Signal Processor
  • protocol stack processor e.g., Central Processing Unit (CPU) or Micro Processing Unit (CPU)
  • CPU Central Processing Unit
  • MPU Micro Processing Unit
  • the protocol stack processor that performs control plane processing may be shared with the application processor 1004, which will be described later.
  • the application processor 1004 is also called a CPU, MPU, microprocessor, or processor core.
  • Application processor 1004 may include multiple processors (multiple processor cores).
  • the application processor 1004 includes a system software program (Operating System (OS)) read from the memory 1006 or other memory and various application programs (e.g., a telephone call application, a web browser, a mailer, a camera operation application, a music playback application). By executing , various functions of UE1 are realized.
  • OS Operating System
  • the baseband processor 1003 and the application processor 1004 may be integrated on one chip, as shown by the dashed line (1005) in FIG.
  • the baseband processor 1003 and the application processor 1004 may be implemented as one System on Chip (SoC) device 1005.
  • SoC devices are sometimes called system Large Scale Integration (LSI) or chipsets.
  • Memory 1006 is volatile memory or non-volatile memory or a combination thereof. Memory 1006 may include multiple physically independent memory devices. Volatile memory is, for example, Static Random Access Memory (SRAM) or Dynamic RAM (DRAM) or a combination thereof. Non-volatile memory is masked Read Only Memory (MROM), Electrically Erasable Programmable ROM (EEPROM), flash memory, or a hard disk drive, or any combination thereof.
  • SRAM Static Random Access Memory
  • DRAM Dynamic RAM
  • Non-volatile memory is masked Read Only Memory (MROM), Electrically Erasable Programmable ROM (EEPROM), flash memory, or a hard disk drive, or any combination thereof.
  • memory 1006 may include external memory devices accessible from baseband processor 1003, application processor 1004, and SoC 1005.
  • Memory 1006 may include embedded memory devices integrated within baseband processor 1003, within application processor 1004, or within SoC 1005.
  • memory 1006 may include memory within a Universal Integrated Circuit Card (UICC).
  • UICC Universal Integrated Circuit
  • the memory 1006 may store one or more software modules (computer programs) 1007 containing instructions and data for performing processing by the UE 1 described in the multiple embodiments above.
  • the baseband processor 1003 or the application processor 1004 reads the software module 1007 from the memory 1006 and executes it to perform the processing of the UE1 described in the above embodiment with reference to the drawings. may be configured.
  • control plane processing and operations performed by the UE 1 described in the above embodiments are performed by other elements other than the RF transceiver 1001 and the antenna array 1002, that is, at least one of the baseband processor 1003 and the application processor 1004 and the software module 1007.
  • This can be realized by a memory 1006 that stores .
  • FIG. 11 is a block diagram showing a configuration example of the RAN node 2 according to the above embodiment.
  • RAN node 2 includes a Radio Frequency transceiver 1101, a network interface 1103, a processor 1104, and a memory 1105.
  • RF transceiver 1101 performs analog RF signal processing to communicate with UEs1 and other UEs.
  • RF transceiver 1101 may include multiple transceivers.
  • RF transceiver 1101 is coupled to antenna array 1102 and processor 1104.
  • RF transceiver 1101 receives modulation symbol data from processor 1104, generates a transmit RF signal, and provides the transmit RF signal to antenna array 1102.
  • RF transceiver 1101 generates a baseband reception signal based on the reception RF signal received by antenna array 1102 and supplies this to processor 1104.
  • RF transceiver 1101 may include analog beamformer circuitry for beamforming.
  • the analog beamformer circuit includes, for example, multiple phase shifters and multiple power amplifiers.
  • the network interface 1103 is used to communicate with network nodes (e.g. other RAN nodes, as well as control and forwarding nodes of the core network).
  • the network interface 1103 may include, for example, a network interface card (NIC) compliant with the IEEE 802.3 series.
  • NIC network interface card
  • the processor 1104 performs digital baseband signal processing (data plane processing) and control plane processing for wireless communication.
  • Processor 1104 may include multiple processors.
  • the processor 1104 includes a modem processor (e.g. Digital Signal Processor (DSP)) that performs digital baseband signal processing and a protocol stack processor (e.g. Central Processing Unit (CPU) or Micro Processing Unit (MPU)) that performs control plane processing. ) may also be included.
  • DSP Digital Signal Processor
  • a protocol stack processor e.g. Central Processing Unit (CPU) or Micro Processing Unit (MPU)
  • Processor 1104 may include a digital beamformer module for beamforming.
  • the digital beamformer module may include a Multiple Input Multiple Output (MIMO) encoder and precoder.
  • MIMO Multiple Input Multiple Output
  • the memory 1105 is configured by a combination of volatile memory and nonvolatile memory.
  • Volatile memory is, for example, Static Random Access Memory (SRAM) or Dynamic RAM (DRAM) or a combination thereof.
  • Non-volatile memory is masked Read Only Memory (MROM), Electrically Erasable Programmable ROM (EEPROM), flash memory, or a hard disk drive, or any combination thereof.
  • Memory 1105 may include storage located remotely from processor 1104. In this case, processor 1104 may access memory 1105 via network interface 1103 or other I/O interface.
  • the memory 1105 may store one or more software modules (computer programs) 1106 containing instructions and data for processing by the RAN node 2 described in the embodiments above.
  • the processor 1104 may be configured to read and execute the software module 1106 from the memory 1105 to perform the processing of the RAN node 2 described in the embodiments above.
  • the RAN node 2 is a Central Unit (CU) (e.g., gNB-CU) or a CU Control Plane Unit (CU-CP) (e.g., gNB-CU-CP), the RAN node 2 has an RF transceiver 1101 ( and antenna array 1102).
  • CU Central Unit
  • CU-CP CU Control Plane Unit
  • the RAN node 2 has an RF transceiver 1101 ( and antenna array 1102).
  • FIG. 12 shows an example of the configuration of the AMF 41.
  • Other core network nodes and V2X application servers 61E within the 5GC 40 may also have configurations similar to those shown in FIG. 12.
  • AMF 41 includes a network interface 1201, a processor 1202, and a memory 1203.
  • Network interface 1201 is used, for example, to communicate with other network functions (NFs) or nodes.
  • the network interface 1201 may include, for example, a network interface card (NIC) compliant with the IEEE 802.3 series.
  • NIC network interface card
  • the processor 1202 may be, for example, a microprocessor, a Micro Processing Unit (MPU), or a Central Processing Unit (CPU). Processor 1202 may include multiple processors.
  • MPU Micro Processing Unit
  • CPU Central Processing Unit
  • the memory 1203 is composed of volatile memory and nonvolatile memory.
  • Memory 1203 may include multiple physically independent memory devices. Volatile memory is, for example, Static Random Access Memory (SRAM) or Dynamic RAM (DRAM) or a combination thereof. Non-volatile memory is masked Read Only Memory (MROM), Electrically Erasable Programmable ROM (EEPROM), flash memory, or a hard disk drive, or any combination thereof.
  • Memory 1203 may include storage located remotely from processor 1202. In this case, processor 1202 may access memory 1203 via network interface 1201 or other I/O interface.
  • the memory 1203 may store one or more software modules (computer programs) 1204 that include instructions and data for performing the processing by the AMF 41 described in the above embodiments.
  • processor 1202 may be configured to read and execute the software module 1204 from memory 1203 to perform the AMF 41 processing described in the embodiments above.
  • each of the processors included in the core network nodes such as the UE 1, the RAN node 2, and the AMF 41, and the V2X application server 61 according to the above-described embodiments
  • One or more programs can be executed that include instructions for causing a computer to perform the algorithms described using the program.
  • the program includes instructions (or software code) that, when loaded into a computer, cause the computer to perform one or more of the functions described in the embodiments.
  • the program may be stored on a non-transitory computer readable medium or a tangible storage medium.
  • computer readable or tangible storage media may include random-access memory (RAM), read-only memory (ROM), flash memory, solid-state drive (SSD) or other memory technology, CD - Including ROM, digital versatile disk (DVD), Blu-ray disk or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device.
  • the program may be transmitted on a transitory computer-readable medium or a communication medium.
  • transitory computer-readable or communication media includes electrical, optical, acoustic, or other forms of propagating signals.
  • At least one wireless transceiver at least one processor coupled to the at least one wireless transceiver;
  • the at least one processor includes: receiving a first sidelink transmission from a peer wireless terminal on a first sidelink carrier; receiving a second sidelink transmission from the peer wireless terminal on a second sidelink carrier;
  • a first hybrid automatic repeat request (HARQ) feedback for the first sidelink transmission and a second HARQ feedback for the second sidelink transmission are transmitted over multiple times within the same time slot of the first sidelink carrier.
  • PSFCH Physical Sidelink Feedback Channel
  • the plurality of PSFCH resources are located in different symbols, different resource blocks, or different symbols and different resource blocks within the same time slot,
  • the at least one processor is configured to determine the plurality of PSFCH resources based on a resource pool configuration of the first sidelink carrier;
  • the resource pool configuration of the first sidelink carrier includes the arrangement of multiple PSFCH symbols used for HARQ feedback of sidelink transmission on the first sidelink carrier and the arrangement of PSFCH symbols on the second sidelink carrier. shows the arrangement of multiple PSFCH symbols used for HARQ feedback for sidelink transmission,
  • the resource pool configuration of the first sidelink carrier is preconfigured in a non-volatile memory or a Universal Subscriber Identity Module (USIM) in Mobile Equipment (ME) of the wireless terminal;
  • the wireless terminal described in Appendix 3. the at least one processor is configured to receive the resource pool configuration of the first sidelink carrier from a radio access network;
  • the wireless terminal described in Appendix 3. (Appendix 6) receiving the first sidelink transmission occurs in the same time slot as receiving the second sidelink transmission;
  • the wireless terminal according to any one of Supplementary Notes 1 to 5.
  • a program that causes a computer to perform a method for a wireless terminal comprising: The method includes: receiving a first sidelink transmission from a peer wireless terminal on a first sidelink carrier; receiving a second sidelink transmission from the peer wireless terminal on a second sidelink carrier; A first hybrid automatic repeat request (HARQ) feedback for the first sidelink transmission and a second HARQ feedback for the second sidelink transmission are transmitted over multiple times within the same time slot of the first sidelink carrier. Transmit using Physical Sidelink Feedback Channel (PSFCH) resources, prepare for things, program.
  • PSFCH Physical Sidelink Feedback Channel
  • (Appendix 9) at least one wireless transceiver; at least one processor coupled to the at least one wireless transceiver;
  • the at least one processor includes: receiving a first sidelink transmission from a peer wireless terminal on a first sidelink carrier; receiving a second sidelink transmission from the peer wireless terminal on a second sidelink carrier;
  • a first Physical Sidelink Feedback Channel (PSFCH) transmission on the first sidelink carrier for hybrid automatic repeat request (HARQ) feedback regarding the first sidelink transmission provides HARQ feedback regarding the second sidelink transmission. If the second PSFCH transmission on the second sidelink carrier overlaps in time with the second PSFCH transmission on the second sidelink carrier, the second PSFCH transmission on the second sidelink carrier is used as a subsequent PSFCH transmission occasion. delay, configured like this, wireless terminal.
  • PSFCH Physical Sidelink Feedback Channel
  • (Appendix 10) receiving the first sidelink transmission occurs in the same time slot as receiving the second sidelink transmission;
  • the wireless terminal described in Appendix 9. (Appendix 11) receiving a first sidelink transmission from a peer wireless terminal on a first sidelink carrier; receiving a second sidelink transmission from the peer wireless terminal on a second sidelink carrier;
  • a first Physical Sidelink Feedback Channel (PSFCH) transmission on the first sidelink carrier for hybrid automatic repeat request (HARQ) feedback regarding the first sidelink transmission provides HARQ feedback regarding the second sidelink transmission. If the second PSFCH transmission on the second sidelink carrier overlaps in time with the second PSFCH transmission on the second sidelink carrier, the second PSFCH transmission on the second sidelink carrier is used as a subsequent PSFCH transmission occasion.
  • PSFCH Physical Sidelink Feedback Channel
  • HARQ hybrid automatic repeat request
  • a program that causes a computer to perform a method for a wireless terminal comprising: The method includes: receiving a first sidelink transmission from a peer wireless terminal on a first sidelink carrier; receiving a second sidelink transmission from the peer wireless terminal on a second sidelink carrier; A first Physical Sidelink Feedback Channel (PSFCH) transmission on the first sidelink carrier for hybrid automatic repeat request (HARQ) feedback regarding the first sidelink transmission provides HARQ feedback regarding the second sidelink transmission. If the second PSFCH transmission on the second sidelink carrier overlaps in time with the second PSFCH transmission on the second sidelink carrier, the second PSFCH transmission on the second sidelink carrier is used as a subsequent PSFCH transmission occasion.
  • PSFCH Physical Sidelink Feedback Channel
  • HARQ hybrid automatic repeat request
  • At least one wireless transceiver at least one processor coupled to the at least one wireless transceiver; The at least one processor includes: receiving a first sidelink transmission from a peer wireless terminal on a first sidelink carrier; receiving a second sidelink transmission from the peer wireless terminal on a second sidelink carrier; A first Physical Sidelink Feedback Channel (PSFCH) transmission on the first sidelink carrier for hybrid automatic repeat request (HARQ) feedback regarding the first sidelink transmission provides HARQ feedback regarding the second sidelink transmission.
  • PSFCH Physical Sidelink Feedback Channel
  • HARQ hybrid automatic repeat request
  • the at least one processor performs the first PSFCH transmission or performs the second PSFCH transmission based on the first sidelink transmission priority and the second sidelink transmission priority. configured to select The wireless terminal according to appendix 13.
  • the at least one processor performs the first PSFCH transmission or transmits the second PSFCH based on a Channel Busy Ratio (CBR) of the first sidelink carrier and a CBR of the second sidelink carrier. configured to select whether to send;
  • the at least one processor performs the first PSFCH transmission based on Sidelink Reference Signal Received Power (SL-RSRP) of the first sidelink carrier and SL-RSRP of the second sidelink carrier.
  • SL-RSRP Sidelink Reference Signal Received Power
  • the wireless terminal according to appendix 13.
  • receiving the first sidelink transmission occurs in the same time slot as receiving the second sidelink transmission;
  • the wireless terminal according to any one of Supplementary Notes 13 to 16.
  • a first Physical Sidelink Feedback Channel (PSFCH) transmission on the first sidelink carrier for hybrid automatic repeat request (HARQ) feedback regarding the first sidelink transmission provides HARQ feedback regarding the second sidelink transmission.
  • PSFCH Physical Sidelink Feedback Channel
  • a method performed by a wireless terminal A method performed by a wireless terminal.
  • PSFCH Physical Sidelink Feedback Channel
  • HARQ hybrid automatic repeat request

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  • Engineering & Computer Science (AREA)
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  • Signal Processing (AREA)
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WO2021088810A1 (en) * 2019-11-04 2021-05-14 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Feedback channel mapping and multiplexing harq reports in nr sidelink communication

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