WO2020088112A1 - V2x传输的反馈方法、装置及用户设备 - Google Patents

V2x传输的反馈方法、装置及用户设备 Download PDF

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Publication number
WO2020088112A1
WO2020088112A1 PCT/CN2019/105077 CN2019105077W WO2020088112A1 WO 2020088112 A1 WO2020088112 A1 WO 2020088112A1 CN 2019105077 W CN2019105077 W CN 2019105077W WO 2020088112 A1 WO2020088112 A1 WO 2020088112A1
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Prior art keywords
sending
feedback information
feedback
data
information
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PCT/CN2019/105077
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English (en)
French (fr)
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邓云
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展讯通信（上海）有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • 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
    • 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
    • H04L1/1607—Details of the supervisory signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • 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]

Definitions

  • the present disclosure relates to the field of wireless communication technology, and in particular, to a feedback method, apparatus, and user equipment for V2X transmission.
  • LTE Long Term Evolution
  • ProSe Proximity-based Services, Proximity Services
  • resource allocation There are two modes of resource allocation, one is scheduling resource allocation (Scheduled Resource Allocation), which is configured by the base station through dedicated signaling; the other is automatic resource selection (Autonomous Resource Selection), the base station can use system messages Or RRC (Radio Resource Control) signaling provides the UE with a resource pool for direct communication, and the UE selects a resource for direct communication from the resource pool. If the transmitted UE (Transmitter UE) is not within the network coverage, the UE uses automatic resource selection to select resources for direct communication from a pre-configured resource pool.
  • scheduling resource allocation Schecheduled Resource Allocation
  • RRC Radio Resource Control
  • V2X Vehicle-to-Everything
  • a certain UE can send V2X messages to multiple UEs. It should be noted that both the receiving UE and the sending UE may not be within the network coverage, or some UEs may be within the network coverage.
  • NR New Radio
  • 5G New Radio
  • NR V2X can use unicast (unicast), multicast (groupcast) or broadcast to transmit V2X services.
  • unicast unicast
  • groupcast multicast
  • broadcast broadcast to transmit V2X services.
  • the transmitting UE adopts unicast or multicast feedback can be introduced, but how to implement V2X feedback is a problem that needs to be solved.
  • the feedback method, device and user equipment for V2X transmission provided by the present disclosure can implement flexible on-carrier feedback or cross-carrier feedback according to the capabilities of the UE and the wireless environment.
  • the present disclosure provides a feedback method for V2X transmission, including:
  • the sending feedback information to the sending-end UE on one or more frequencies includes sending feedback information to the sending-end UE on the frequency where the V2X data is received.
  • the information required for feedback is learned from the SCI.
  • the sending feedback information to the sending-end UE on one or more frequencies includes: according to its own transmission capability and The channel environment in which it is located sends feedback information to the sending-end UE in a cross-carrier manner.
  • the feedback information includes V2X status information received on each carrier; or, the feedback information further includes the received reception frequency information; or, the feedback information further includes a logical channel identifier .
  • the sending feedback information to the sending-end UE in a cross-carrier manner according to its own transmission capability and its channel environment includes:
  • One part sends feedback information to the sending UE on the frequency where the V2X data is received, and the other part sends feedback information to the sending UE on the frequency where the V2X data is not received.
  • the sending feedback information to the sending-end UE on one or more frequencies includes: preferentially sending the feedback information to the sending-end UE at the frequency where the V2X data is currently received, when its capability is not supported or not When a suitable transmission feedback resource is found, another frequency is selected to send feedback information to the sending-end UE.
  • the sending feedback information to the sending-end UE on one or more frequencies includes sending feedback information to the sending-end UE according to the feedback frequency information indicated in the SCI.
  • the present disclosure provides a feedback device for V2X transmission, including:
  • a receiving unit configured to receive the SCI sent by the UE at the sending end and the V2X data located on the PSSCH, where the SCI indicates the transmission resources occupied by the V2X data on the PSSCH;
  • the sending unit is configured to send feedback information to the sending end UE on one or more frequencies.
  • the sending unit is configured to send feedback information to the sending UE on the frequency where the V2X data is received.
  • the information required for feedback is learned from the SCI.
  • the sending unit when the sending-end UE sends V2X data on multiple carriers simultaneously or in a time-sharing manner, the sending unit is configured to use a cross-carrier approach based on its own transmission capability and its own channel environment The sending end UE sends feedback information.
  • the feedback information includes V2X status information received on each carrier; or, the feedback information further includes the received reception frequency information; or, the feedback information further includes a logical channel identifier .
  • the sending unit is configured to send feedback information to the sending-end UE only at one or a part of the frequencies where the V2X data is received; or,
  • One part sends feedback information to the sending UE on the frequency where the V2X data is received, and the other part sends feedback information to the sending UE on the frequency where the V2X data is not received.
  • the sending unit is configured to preferentially send feedback information to the sending-end UE at the frequency where the V2X data is currently received, and when its own capability does not support or does not find a suitable transmission feedback resource, select another frequency to send to The sending UE sends feedback information.
  • the sending unit is configured to send feedback information to the sending-end UE according to the feedback frequency information indicated in the SCI.
  • the present disclosure provides user equipment, the user equipment including the feedback device for V2X transmission described above.
  • the feedback method, apparatus and user equipment for V2X transmission receive the SCI sent by the UE at the sending end and the V2X data located on the PSSCH.
  • the SCI indicates the transmission resources occupied by the V2X data on the PSSCH.
  • Feedback information is sent to the sending-end UE on one or more frequencies, so that flexible on-carrier feedback or cross-carrier feedback can be realized according to the capabilities of the UE and the wireless environment.
  • FIG. 1 is a flowchart of a feedback method for V2X transmission provided by an embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram of a feedback device for V2X transmission according to an embodiment of the present disclosure.
  • An embodiment of the present disclosure provides a feedback method for V2X transmission.
  • the method is applied to a receiving end UE. As shown in FIG. 1, the method includes:
  • the receiving UE receives the SCI (Sidelink Control Information) and the V2X data on the PSSCH (Physical Physical Sidelink Shared Channel) sent by the transmitting UE.
  • the SCI indicates Describe the transmission resources occupied by V2X data on the PSSCH.
  • the PC5 interface in this disclosure refers to a direct interface between UEs.
  • the physical layer control signaling transmitted through the PC5 interface is called SCI, and the V2X data transmitted on the direct interface is located on the PSSCH.
  • the receiving end UE sends feedback information to the sending end UE on one or more frequencies.
  • the receiving end UE receives the SCI sent by the sending end UE and the V2X data located on the PSSCH, and the SCI indicates the transmission resources occupied by the V2X data on the PSSCH.
  • the sending UE can indicate the receiving UE to send feedback information to the sending UE through SCI, and the sending UE can also indicate to the receiving UE that the receiving UE needs to send feedback information through layer 2 or layer 3 control signaling.
  • the number of frequencies at which the receiving-end UE receives V2X data is equal to or greater than the number of frequencies at which the receiving-end UE sends feedback information.
  • both the UE as the sending end and the UE as the receiving end support 5G V2X.
  • This embodiment uses unicast scenarios as an example for description, and is also applicable to multicast.
  • the receiving end UE can One or more, multiple UEs respectively adopt the following scheme.
  • UE A located in serving cell 1 (Cell 1) expects to send V2X data to surrounding UE B.
  • UE B may be located in serving cell 1, or neighboring cells, or not within the network coverage.
  • UE A can use network assistance or directly discover that UE B is nearby, and can perform V2X transmission.
  • UE A can request the transmission resource of sending V2X service to Cell 1, and can also use the resource pool broadcast in the system message of Cell 1 to select the transmission resource of transmitting V2X.
  • UE A transmits V2X services to UE B it usually contains the SCI of the direct link control signaling and the data located on the PSSCH.
  • SCI indicates information such as the transmission resources occupied by V2X data on the PSSCH.
  • the SCI may also instruct UE B to receive feedback after receiving V2X data.
  • UE B knows through the system message in the cell where it resides that it needs to receive the V2X receiving resource pool, or when UE B is outside the network coverage, it uses a pre-configured resource pool to receive V2X.
  • UE A can have the ability to perform V2X transmission on multiple carriers at the same time or time-sharing. At this time, the transmission resources on these multiple carriers can be allocated by Cell 1, or partly by Cell 1, and the other is the strongest on the frequency. Cell allocation. For example, the uplink carrier F1 of Cell 1, Cell 1 can allocate transmission resources on F1 to UE A; UE A also expects to transmit V2X on carrier F2, and UE A detects that it is on F2 (when TDD, the uplink and downlink carriers of the cell are the same; In FDD, the cell's uplink and downlink carriers are different, because the V2X transmission is located in the time slot of the uplink carrier, so the UE is to detect the downlink carrier corresponding to F2 to obtain the strongest cell) The strongest cell is Cell 3, and UE can use the Cell 3 system Get the configured resource pool for V2X transmission from the message, and select the appropriate resource to transmit V2X services.
  • the uplink carrier F1 of Cell 1 Cell 1 can allocate transmission resources on F1 to UE A
  • UE A transmits V2X services to UE B through F1, F2, and F3 at the same time.
  • Different V2X services can be transmitted on different carriers, and the same V2X services can also be transmitted.
  • UE B also enables the receiving functions on F1, F2, and F3, and can receive the V2X services sent by UE A from these three carriers.
  • UE B can learn from the SCI sent by UE A that feedback is needed, and uses one of the following feedback methods for feedback:
  • UE B sends feedback to UE A at the frequency where V2X data is received.
  • the feedback frequency and the reception frequency are in one-to-one correspondence, that is, UE B receives V2X data on F1, and then sends F2X data reception status, such as ACK or NACK, to FUE on the current frequency to F1.
  • the feedback may select resources to transmit feedback information in an independent feedback resource pool configured by the network, or a dedicated feedback resource may be allocated by the cell where UE B is located.
  • the feedback information may also include the identity of the sending UE, the identity of the receiving UE, and the sequence number of receiving V2X data.
  • UEB uses the cross-carrier method for feedback based on its own transmission capability and its channel environment, which can be:
  • the UE B only sends feedback to UE A on one or part of the carriers, such as F1.
  • the feedback information contains the V2X status information received by UE B on F1, F2, and F3.
  • the carrier is a carrier where V2X data is received, or a carrier where non-V2X data is received.
  • UE B may indicate the received reception frequency information so that UE A can identify the transmission data corresponding to the feedback information. If at a certain moment UE B can encode the feedback information according to the frequency information, the receiving state on F1 is ACK, the receiving state on F2 is NACK, and the receiving state on F3 is ACK, UE B can be coded as F1, ACK; F2, NACK; F3, ACK. On one frequency, UE A may transmit V2X data of multiple logical channels, so the feedback information may also need to add information such as logical channel identification, so that the sending UE can easily identify which V2X data when receiving the feedback information. Confirmation of receipt has been obtained and which has not been confirmed.
  • UE B can send feedback to UE A on one or more different receiving frequencies. For example, UE B can send feedback to UE A on frequency F1 to receive V2X data on F1, and send F2 and F2 to UE A on F4. Receive feedback of V2X data on F3. UE B does not choose to receive the frequency to send feedback, sometimes because UE B has insufficient capacity, sometimes because UE B does not find the transmission resource with little interference on the receiving frequency for feedback.
  • the resources for transmitting feedback can be shared by multiple UEs. If there are many other UEs using feedback resources, it will cause strong interference on the resources for transmitting feedback.
  • UE B gives priority to feedback on the current frequency of receiving V2X data. If UE capability does not support or does not find a suitable resource for transmitting feedback, UE B selects another frequency for feedback and indicates in the feedback the frequency at which V2X data is received , Optionally including logical channel information, etc.
  • the logical channel is used to represent different V2X services.
  • UE A may send multiple V2X services to UE B. These multiple V2X services are mapped to different logical channels.
  • the feedback information indicates that The logical channel enables UE A to accurately locate the transmission status of the V2X service corresponding to the feedback information.
  • UE A can indicate the feedback frequency information in the SCI. If it can be instructed to only feedback on V1X data on the three receiving frequencies on F1, UE B according to the SCI The indicated feedback frequency information sends feedback information to the UE.
  • the protocol can set a fixed time, for example, when the 4 slots after receiving V2X data, feedback can also be The feedback time slot is indicated by SCI.
  • An embodiment of the present disclosure also provides a feedback device for V2X transmission.
  • the device is located at a receiving end UE. As shown in FIG. 2, the device includes:
  • the receiving unit 11 is configured to receive the SCI sent by the UE at the sending end and the V2X data located on the PSSCH, where the SCI indicates the transmission resources occupied by the V2X data on the PSSCH;
  • the sending unit 12 is configured to send feedback information to the sending-end UE on one or more frequencies.
  • the receiving end UE receives the SCI sent by the sending end UE and V2X data located on the PSSCH, the SCI indicates the transmission resources occupied by the V2X data on the PSSCH, and the receiving end UE Send feedback information to the sending-end UE on one or more frequencies, so that flexible on-carrier feedback or cross-carrier feedback can be realized according to the capabilities of the UE and the wireless environment.
  • the sending unit 12 is configured to send feedback information to the sending-end UE on the frequency where the V2X data is received.
  • the information required for feedback is learned from the SCI.
  • the sending unit 12 is configured to adopt a cross-carrier method according to its own transmission capability and its own channel environment Sending feedback information to the sending end UE.
  • the feedback information includes V2X status information received on each carrier; or, the feedback information further includes the received reception frequency information; or, the feedback information further includes the logical channel identifier.
  • the sending unit 12 is configured to send feedback information to the sending UE only on one or a part of the frequencies where the V2X data is received; or,
  • One part sends feedback information to the sending UE on the frequency where the V2X data is received, and the other part sends feedback information to the sending UE on the frequency where the V2X data is not received.
  • the sending unit 12 is configured to preferentially send feedback information to the sending-end UE at the frequency where the V2X data is currently received, and when its own capability does not support or no suitable transmission feedback resource is found, select another frequency direction.
  • the sending end UE sends feedback information.
  • the sending unit 12 is configured to send feedback information to the sending-end UE according to the feedback frequency information indicated in the SCI.
  • the device of this embodiment may be used to execute the technical solutions of the above method embodiments, and its implementation principles and technical effects are similar, and will not be repeated here.
  • An embodiment of the present disclosure also provides user equipment, where the user equipment includes the feedback device for V2X transmission described above.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM), etc.

Abstract

本公开提供一种V2X传输的反馈方法、装置及用户设备。所述方法包括：接收发送端UE发送的SCI以及位于PSSCH上的V2X数据，所述SCI指示所述V2X数据在PSSCH上所占据的传输资源；在一个或多个频率上向所述发送端UE发送反馈信息。本公开能够根据UE的能力以及无线环境，实现灵活的同载波反馈或跨载波反馈。

Description

V2X传输的反馈方法、装置及用户设备 技术领域
本公开涉及无线通信技术领域，尤其涉及一种V2X传输的反馈方法、装置及用户设备。
背景技术
在Release 12，LTE(Long Term Evolution，长期演进)引入了ProSe(Proximity-based Services，邻近业务)直接通信。UE A和UE B(可以是多个UE)之间可以通过PC5接口进行直接通信。
有两种模式的资源分配方式，一种是调度资源分配(Scheduled Resource Allocation)方式，这是由基站通过专用信令配置；一种是自动资源选择(Autonomous Resource Selection)方式，基站可以通过系统消息或RRC(Radio Resource Control，无线资源控制)信令为UE提供用于直接通信的资源池，UE从资源池中选择用于直接通信的资源。如果传输的UE(Transmitter UE)不在网络覆盖范围内，UE采用自动资源选择方式从预先配置的资源池中选择用于直接通信的资源。
基于直接通信，3GPP(3rd Generation Partnership Project，第三代合作伙伴计划)也支持车联网(Vehicle-to-Everything，V2X)。在网络覆盖范围内，某个UE可以向多个UE发送V2X消息。需要说明的是，接收UE和发送UE均可能不在网络覆盖范围内，或者部分UE在网络覆盖范围之内。
当前，3GPP正在研究在5G(即New Radio，NR)中引入V2X。因为5G系统能够提供更大的带宽、更低的时延，可以更好的满足V2X的业务需求。并且3GPP已经同意NR V2X可以采用单播(unicast)、组播(groupcast)或者广 播方式传输V2X业务。当传输UE采用单播或组播时，可以引入反馈，然而如何实现V2X的反馈是需要解决的问题。
公开内容
本公开提供的V2X传输的反馈方法、装置及用户设备，能够根据UE的能力以及无线环境，实现灵活的同载波反馈或跨载波反馈。
第一方面，本公开提供一种V2X传输的反馈方法，包括：
接收发送端UE发送的SCI以及位于PSSCH上的V2X数据，所述SCI指示所述V2X数据在PSSCH上所占据的传输资源；
在一个或多个频率上向所述发送端UE发送反馈信息。
可选地，所述在一个或多个频率上向所述发送端UE发送反馈信息包括：在接收V2X数据的所在频率上向所述发送端UE发送反馈信息。
可选地，从所述SCI获知需要反馈的信息。
可选地，当所述发送端UE在多个载波上同时或者分时发送V2X数据时，所述在一个或多个频率上向所述发送端UE发送反馈信息包括：根据自身的发射能力以及自身所处的信道环境，采用跨载波的方式向所述发送端UE发送反馈信息。
可选地，所述反馈信息中包括在各载波上所接收的V2X的状态信息；或者，所述反馈信息中还包括所反馈的接收频率信息；或者，所述反馈信息中还包括逻辑信道标识。
可选地，所述根据自身的发射能力以及自身所处的信道环境，采用跨载波的方式向所述发送端UE发送反馈信息包括：
只在接收V2X数据所在的其中一个或部分频率上向所述发送端UE发送反馈信息；或者，
只在非接收V2X数据所在的频率上向所述发送端UE发送反馈信息；或者，
一部分在接收V2X数据所在的频率上向所述发送端UE发送反馈信息，另一部分在非接收V2X数据所在的频率上向所述发送端UE发送反馈信息。
可选地，所述在一个或多个频率上向所述发送端UE发送反馈信息包括：优先在当前接收V2X数据的所在频率向所述发送端UE发送反馈信息，当自身能力不支持或者未发现合适的传输反馈资源时，选择其它频率向所述发送端UE发送反馈信息。
可选地，所述在一个或多个频率上向所述发送端UE发送反馈信息包括：根据所述SCI中指示的反馈频率信息向所述发送端UE发送反馈信息。
第二方面，本公开提供一种V2X传输的反馈装置，包括：
接收单元，用于接收发送端UE发送的SCI以及位于PSSCH上的V2X数据，所述SCI指示所述V2X数据在PSSCH上所占据的传输资源；
发送单元，用于在一个或多个频率上向所述发送端UE发送反馈信息。
可选地，所述发送单元，用于在接收V2X数据的所在频率上向所述发送端UE发送反馈信息。
可选地，从所述SCI获知需要反馈的信息。
可选地，当所述发送端UE在多个载波上同时或者分时发送V2X数据时，所述发送单元，用于根据自身的发射能力以及自身所处的信道环境，采用跨载波的方式向所述发送端UE发送反馈信息。
可选地，所述反馈信息中包括在各载波上所接收的V2X的状态信息；或者，所述反馈信息中还包括所反馈的接收频率信息；或者，所述反馈信息中还包括逻辑信道标识。
可选地，所述发送单元，用于只在接收V2X数据所在的其中一个或部分频 率上向所述发送端UE发送反馈信息；或者，
只在非接收V2X数据所在的频率上向所述发送端UE发送反馈信息；或者，
一部分在接收V2X数据所在的频率上向所述发送端UE发送反馈信息，另一部分在非接收V2X数据所在的频率上向所述发送端UE发送反馈信息。
可选地，所述发送单元，用于优先在当前接收V2X数据的所在频率向所述发送端UE发送反馈信息，当自身能力不支持或者未发现合适的传输反馈资源时，选择其它频率向所述发送端UE发送反馈信息。
可选地，所述发送单元，用于根据所述SCI中指示的反馈频率信息向所述发送端UE发送反馈信息。
第三方面，本公开提供一种用户设备，所述用户设备包括上述V2X传输的反馈装置。
本公开实施例提供的V2X传输的反馈方法、装置及用户设备，接收发送端UE发送的SCI以及位于PSSCH上的V2X数据，所述SCI指示所述V2X数据在PSSCH上所占据的传输资源，在一个或多个频率上向所述发送端UE发送反馈信息，从而，能够根据UE的能力以及无线环境，实现灵活的同载波反馈或跨载波反馈。
附图说明
图1为本公开实施例提供的V2X传输的反馈方法的流程图；
图2为本公开实施例提供的V2X传输的反馈装置的结构示意图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公 开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
本公开实施例提供一种V2X传输的反馈方法，所述方法应用为接收端UE，如图1所示，所述方法包括：
S11、接收端UE接收发送端UE发送的SCI(Sidelink Control Information，直通链路控制信令)以及位于PSSCH(Physical Sidelink Shared Channel，物理直通链路共享信道)上的V2X数据，所述SCI指示所述V2X数据在PSSCH上所占据的传输资源。
在5G中，UE之间的直接接口是否仍然沿用PC5接口还没有确定。为简化起见，本公开中PC5接口是指UE之间的直接接口，通过PC5接口传输的物理层控制信令称为SCI，在直接接口传输的V2X数据位于PSSCH。
S12、接收端UE在一个或多个频率上向所述发送端UE发送反馈信息。
本公开实施例提供的V2X传输的反馈方法，接收端UE接收发送端UE发送的SCI以及位于PSSCH上的V2X数据，所述SCI指示所述V2X数据在PSSCH上所占据的传输资源，接收端UE在一个或多个频率上向所述发送端UE发送反馈信息，从而，能够根据UE的能力以及无线环境，实现灵活的同载波反馈或跨载波反馈。通常，发送端UE可以通过SCI指示接收端UE需要发送反馈信息给发送端UE，发送端UE也可以通过层2或层3的控制信令向接收端UE指示接收端UE需要发送反馈信息。
通常对于同一个发送端UE，接收端UE接收V2X数据的频率数量等于或大于接收端UE发送反馈信息的频率数量。
下面对本公开实施例V2X传输的反馈方法进行详细说明。
在本实施例中，作为发送端的UE A和作为接收端的UE B均支持5G V2X， 本实施例以单播场景为例进行说明，对于组播也适用，在组播场景下，接收端UE可以是一个或多个，多个UE分别采用如下的方案。
位于服务小区1(Cell 1)的UE A期待向周边的UE B发送V2X数据，UE B可能位于服务小区1、或者邻区、或者不在网络覆盖范围之内。
UE A可以通过网络辅助或者通过直接发现探知UE B在附近，可以进行V2X传输。
UE A可以向Cell 1请求发送V2X业务的传输资源，也可以利用Cell 1的系统消息中广播的资源池选择传输V2X的传输资源。当UE A向UE B传输V2X业务时，通常包含直通链路控制信令SCI以及位于PSSCH上的数据。SCI指示了V2X数据在PSSCH上所占据的传输资源等信息。SCI可能还指示UE B收到V2X数据之后需要反馈的信息。
UE B在自己所驻留的小区通过系统消息获知需要接收V2X的接收资源池，或者当UE B处于网络覆盖范围之外时采用预配置的资源池接收V2X。
UE A可以具备在多个载波上同时或者分时进行V2X传输的能力，此时这多个载波上的传输资源可以由Cell 1分配，或者部分由Cell 1分配，其他由所在频率上的最强小区分配。比如Cell 1的上行载波F1，Cell 1可以为UE A分配F1上的传输资源；UE A还期待在载波F2上传输V2X，UE A探测到在F2上(TDD时，小区的上下行载波相同；FDD时，小区的上下行载波不同，因为V2X传输位于上行载波的时隙，因此UE是探测F2对应的下行载波获得最强小区)的最强小区是Cell 3，UE A可以从Cell 3的系统消息中获得其配置的用于V2X传输的资源池，从中选择合适的资源传输V2X业务。
假定UE A同时通过F1、F2和F3向UE B传输V2X业务，在不同载波上可以传输不同的V2X业务，也可以传输相同的V2X业务。
UE B同时开启了在F1、F2、F3上的接收功能，可以接收UE A从这三个载波发来的V2X业务。
UE B可以从UE A发送的SCI获知需要反馈，并采用以下几种反馈方式中的其中一种进行反馈：
1、UE B在接收V2X数据的所在频率向UE A发送反馈。此时反馈频率和接收频率是一一对应的，即UE B在F1上接收V2X数据，就在F1上向UE A发送当前频率上所接收V2X数据的接收状态如ACK或NACK。反馈可以在网络所配置的独立的反馈资源池中选择资源传输反馈信息，也可能由UE B所在的小区分配专用的反馈资源。反馈的信息除了ACK/NACK之外，可能还有发送UE的标识、接收UE的标识，以及接收V2X数据的序号等信息。
2、UE B依据自己的发射能力以及自己所处的信道环境，采用跨载波的方式进行反馈，具体可以为：
UE B只在一个或部分载波上如F1上向UE A发送反馈，反馈信息包含UE B在F1、F2、F3上所接收的V2X的状态信息。所述载波为接收V2X数据所在的载波，或者非接收V2X数据所在的载波。
对于跨载波反馈，UE B可以指示所反馈的接收频率信息，以便UE A能够识别反馈信息所对应的传输数据。如某个时刻UE B可以按照频率信息对反馈信息进行编码，F1上的接收状态是ACK，F2上的接收状态NACK，F3上的接收状态是ACK，UE B可以编码为F1，ACK；F2，NACK；F3，ACK。由于在一个频率上，UE A可能传输多个逻辑信道的V2X数据，因此反馈信息可能还需要增加逻辑信道标识等信息，以便发送端UE在收到反馈信息时能够很方便的识别出哪些V2X数据已经获得接收确认，哪些没有获得接收确认。
UE B可以在一个或多个不同的接收频率上向UE A发送反馈，如UE B可 以在频率F1上向UE A发送针对F1上接收V2X数据的反馈，在F4上向UE A发送针对F2和F3上接收V2X数据的反馈。UE B不选择接收频率发送反馈，有时是因为UE B的能力不足，有时是因为UE B在接收频率上没有发现受干扰小的传输资源进行反馈。传输反馈的资源可以由多个UE所共享，如果其他正使用反馈资源的UE的数量很多，会造成传输反馈的资源上的干扰很强。
3、UE B优先在当前接收V2X数据的频率上进行反馈，如果UE能力不支持或者未发现合适的传输反馈的资源，则UE B选择其他频率进行反馈，在反馈中指示接收V2X数据所在的频率，可选包括逻辑信道信息等，逻辑信道用于表示不同的V2X业务，UE A可能向UE B发送多种V2X业务，这多种V2X业务映射到不同的逻辑信道上，反馈信息中指示所述逻辑信道使得UE A能够准确定位反馈信息所对应的V2X业务的传输状态。
4、为了减少UE A检测反馈的复杂度，UE A可以在SCI中指示反馈频率信息，如可以指示仅在F1上针对三个接收频率上的V2X数据进行反馈，则UE B根据所述SCI中指示的反馈频率信息向所述UE A发送反馈信息。
需要说明的是，UE B收到UE A的V2X数据之后，何时反馈是需要明确的，协议可以设定一个固定的时间，比如接收到V2X数据之后的4个时隙时进行反馈，也可以通过SCI指示反馈时隙。
本公开实施例还提供一种V2X传输的反馈装置，所述装置位于接收端UE，如图2所示，所述装置包括：
接收单元11，用于接收发送端UE发送的SCI以及位于PSSCH上的V2X数据，所述SCI指示所述V2X数据在PSSCH上所占据的传输资源；
发送单元12，用于在一个或多个频率上向所述发送端UE发送反馈信息。
本公开实施例提供的V2X传输的反馈装置，接收端UE接收发送端UE发 送的SCI以及位于PSSCH上的V2X数据，所述SCI指示所述V2X数据在PSSCH上所占据的传输资源，接收端UE在一个或多个频率上向所述发送端UE发送反馈信息，从而，能够根据UE的能力以及无线环境，实现灵活的同载波反馈或跨载波反馈。
可选地，所述发送单元12，用于在接收V2X数据的所在频率上向所述发送端UE发送反馈信息。
其中，从所述SCI获知需要反馈的信息。
可选地，当所述发送端UE在多个载波上同时或者分时发送V2X数据时，所述发送单元12，用于根据自身的发射能力以及自身所处的信道环境，采用跨载波的方式向所述发送端UE发送反馈信息。
其中，所述反馈信息中包括在各载波上所接收的V2X的状态信息；或者，所述反馈信息中还包括所反馈的接收频率信息；或者，所述反馈信息中还包括逻辑信道标识。
可选地，所述发送单元12，用于只在接收V2X数据所在的其中一个或部分频率上向所述发送端UE发送反馈信息；或者，
只在非接收V2X数据所在的频率上向所述发送端UE发送反馈信息；或者，
一部分在接收V2X数据所在的频率上向所述发送端UE发送反馈信息，另一部分在非接收V2X数据所在的频率上向所述发送端UE发送反馈信息。
可选地，所述发送单元12，用于优先在当前接收V2X数据的所在频率向所述发送端UE发送反馈信息，当自身能力不支持或者未发现合适的传输反馈资源时，选择其它频率向所述发送端UE发送反馈信息。
可选地，所述发送单元12，用于根据所述SCI中指示的反馈频率信息向所述发送端UE发送反馈信息。
本实施例的装置，可以用于执行上述方法实施例的技术方案，其实现原理和技术效果类似，此处不再赘述。
本公开实施例还提供一种用户设备，所述用户设备包括上述V2X传输的反馈装置。
本领域普通技术人员可以理解实现上述方法实施例中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)或随机存储记忆体(Random Access Memory，RAM)等。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应该以权利要求的保护范围为准。

Claims (17)

  1. 一种V2X传输的反馈方法，其特征在于，包括：
    接收发送端UE发送的直通链路控制信令SCI以及位于物理直通链路共享信道PSSCH上的V2X数据，所述SCI指示所述V2X数据在PSSCH上所占据的传输资源；
    在一个或多个频率上向所述发送端UE发送反馈信息。
  2. 根据权利要求1所述的方法，其特征在于，所述在一个或多个频率上向所述发送端UE发送反馈信息包括：在接收V2X数据的所在频率上向所述发送端UE发送反馈信息。
  3. 根据权利要求1所述的方法，其特征在于，从所述SCI获知需要反馈的信息。
  4. 根据权利要求1所述的方法，其特征在于，当所述发送端UE在多个载波上同时或者分时发送V2X数据时，所述在一个或多个频率上向所述发送端UE发送反馈信息包括：根据自身的发射能力以及自身所处的信道环境，采用跨载波的方式向所述发送端UE发送反馈信息。
  5. 根据权利要求4所述的方法，其特征在于，所述反馈信息中包括在各载波上所接收的V2X的状态信息；或者，所述反馈信息中还包括所反馈的接收频率信息；或者，所述反馈信息中还包括逻辑信道标识。
  6. 根据权利要求4所述的方法，其特征在于，所述根据自身的发射能力以及自身所处的信道环境，采用跨载波的方式向所述发送端UE发送反馈信息包括：
    只在接收V2X数据所在的其中一个或部分频率上向所述发送端UE发送反馈信息；或者，
    只在非接收V2X数据所在的频率上向所述发送端UE发送反馈信息；或者，
    一部分在接收V2X数据所在的频率上向所述发送端UE发送反馈信息，另一部分在非接收V2X数据所在的频率上向所述发送端UE发送反馈信息。
  7. 根据权利要求1所述的方法，其特征在于，所述在一个或多个频率上向所述发送端UE发送反馈信息包括：优先在当前接收V2X数据的所在频率向所述发送端UE发送反馈信息，当自身能力不支持或者未发现合适的传输反馈资源时，选择其它频率向所述发送端UE发送反馈信息。
  8. 根据权利要求1所述的方法，其特征在于，所述在一个或多个频率上向所述发送端UE发送反馈信息包括：根据所述SCI中指示的反馈频率信息向所述发送端UE发送反馈信息。
  9. 一种V2X传输的反馈装置，其特征在于，包括：
    接收单元，用于接收发送端UE发送的SCI以及位于PSSCH上的V2X数据，所述SCI指示所述V2X数据在PSSCH上所占据的传输资源；
    发送单元，用于在一个或多个频率上向所述发送端UE发送反馈信息。
  10. 根据权利要求9所述的装置，其特征在于，所述发送单元，用于在接收V2X数据的所在频率上向所述发送端UE发送反馈信息。
  11. 根据权利要求9所述的装置，其特征在于，从所述SCI获知需要反馈的信息。
  12. 根据权利要求9所述的装置，其特征在于，当所述发送端UE在多个载波上同时或者分时发送V2X数据时，所述发送单元，用于根据自身的发射能力以及自身所处的信道环境，采用跨载波的方式向所述发送端UE发送反馈信息。
  13. 根据权利要求12所述的装置，其特征在于，所述反馈信息中包括在各载波上所接收的V2X的状态信息；或者，所述反馈信息中还包括所反馈的接收频率信息；或者，所述反馈信息中还包括逻辑信道标识。
  14. 根据权利要求12所述的装置，其特征在于，所述发送单元，用于只在接收V2X数据所在的其中一个或部分频率上向所述发送端UE发送反馈信息；或者，
    只在非接收V2X数据所在的频率上向所述发送端UE发送反馈信息；或者，
    一部分在接收V2X数据所在的频率上向所述发送端UE发送反馈信息，另一部分在非接收V2X数据所在的频率上向所述发送端UE发送反馈信息。
  15. 根据权利要求9所述的装置，其特征在于，所述发送单元，用于优先在当前接收V2X数据的所在频率向所述发送端UE发送反馈信息，当自身能力不支持或者未发现合适的传输反馈资源时，选择其它频率向所述发送端UE发送反馈信息。
  16. 根据权利要求9所述的装置，其特征在于，所述发送单元，用于根据所述SCI中指示的反馈频率信息向所述发送端UE发送反馈信息。
  17. 一种用户设备，其特征在于，所述用户设备包括如权利要求9至16中任一项所述的V2X传输的反馈装置。
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CMCC: "Discussion on Channel Design of HARQ and CSI Feedback for V2X", 3GPP TSG RAN WG1 MEETING #94BIS R1-1811036, 12 October 2018 (2018-10-12), Chengdu, China, pages 1 - 3, XP051518438 *

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WO2022133771A1 (en) * 2020-12-23 2022-06-30 Nec Corporation Methods for sidelink communication, terminal device, and computer readable media

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