WO2018120871A1 - 基于V2X SideLink通信的向多个目的ID传输信息的方法 - Google Patents

基于V2X SideLink通信的向多个目的ID传输信息的方法 Download PDF

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WO2018120871A1
WO2018120871A1 PCT/CN2017/098975 CN2017098975W WO2018120871A1 WO 2018120871 A1 WO2018120871 A1 WO 2018120871A1 CN 2017098975 W CN2017098975 W CN 2017098975W WO 2018120871 A1 WO2018120871 A1 WO 2018120871A1
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周欣
姜春霞
吕征南
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普天信息技术有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
    • 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
    • H04L5/0037—Inter-user or inter-terminal allocation
    • 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
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H04L5/0039—Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another
    • 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
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • 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

Definitions

  • the present invention relates to communication technologies, and in particular, to a method for transmitting information to multiple destination IDs (identifications) based on V2X SideLink communication.
  • V2X Vehicle to X
  • V2X Vehicle to X
  • V2X Vehicle to X
  • V2X Vehicle to X
  • V2X Vehicle to X
  • V2X Vehicle to X
  • V2P Vehicle-to-Pedestrian
  • V2I Vehicle-to-Infrastructure
  • V2N Vehicle and Application Server
  • Vehicle-to-Network is based on communication, wireless communication and information exchange and processing between the car-X (V2X: car, road, pedestrian and Internet).
  • V2X resource pool design For the V2X resource pool design, which is different from the resource pool design of D2D communication, the V2X resource pool introduces the concept of subchannel, that is, the V2X resource pool contains one or more subchannels, and each subchannel consists of one.
  • a group of consecutive RBs (Resource Blocks) is configured, and the size of the subchannels (sizeSubchannel-r14) is configured by the eNB (evolved Node B, base station) or pre-configuration information to the UE.
  • sizeSubchannel-r14 is an enumerated type, and the values include n4, n5, n6, n8, n9, n10, n12, n15, n16, n18, n20, n25, n30, n48, n50, n72, n75, n96, n100, where N4 represents 4PRBs, n5 represents 5PRBs, and so on.
  • the UE requires resources to be used in integer multiples of consecutive subchannels when the resource pool selects available resources.
  • the 3GPP discussion determines a V2X message multiplexing SL-SCH (Side Link Synchronization Channel) for transmission, and defines a MAC for SL-SCH used for V2X sidelink (V2X secondary link) communication transmission.
  • PDU Media Access Control Media Access Control Protocol Data Unit Protocol Data Unit
  • SL-SCH MAC Subheader as shown in Figure 1 and Figure 2.
  • the size of the DST field is different from the size of the DST field in the SL-SCH MAC sub-header used in D2D communication.
  • the DST field is 24 bits for carrying the Destination Layer-2 ID, and the D2D communication only carries the Destination Layer-2 ID. 16 bits of information, as shown in Figure 3.
  • the V field is used to indicate the format of the SL-SCH subheader. When the field is set to "0011", it is used for V2X sidelink communication, and the DST field is 24 bits; when it is set to "0001" or "0010", it is used for D2D communication, and the DST field is 16 bits.
  • One MAC PDU consists of one MAC header, one or more MAC Service Data Units (MAC SDUs) and optional padding.
  • One of the MAC PDU headers is composed of one SL-SCH subheader and one or more MAC PDU subheaders, and each subheader (except the SL-SCH subheader) corresponds to one MAC SDU (Service Data Unit) or padding.
  • the structure design of this MAC PDU determines that a MAC PDU can only contain related MAC SDUs of a destination ID. In other words, the sender UE can only transmit the relevant V2X service to one destination ID on one TB block, and cannot simultaneously transmit to multiple destination IDs on one TB block.
  • the sub-channel is used as the granularity instead of the RB, so that the UE may not be able to find the proper resources, and the resource utilization may be reduced to cause the spectrum utilization to decrease.
  • MAC SDUs corresponding to multiple destination IDs cannot be multiplexed into one MAC PDU, and need to be transmitted separately, resulting in an increase in transmission delay and an increase in control channel overhead.
  • the present invention proposes a method of transmitting information to a plurality of destination IDs based on V2X SideLink communication that overcomes the above problems or at least partially solves the above problems.
  • the present invention provides a method for transmitting information to a plurality of destination IDs based on V2X SideLink communication, including:
  • the service data unit MAC SDU of each destination ID is multiplexed in one MAC PDU, and the V2X service is transmitted to the receiving method corresponding to all the destination IDs through the SL-SCH channel;
  • the MAC PDU structure is a MAC PDU structure for a V2X SideLink communication scenario on the SL-SCH channel.
  • the MAC PDU includes: one MAC header, one or more MAC SDUs;
  • the MAC PDU includes: a MAC header, one or more MAC SDUs, and padding.
  • the MAC header is composed of one or more SL-SCH subheaders and one or more MAC PDU subheaders.
  • each SL-SCH subheader is associated with a MAC PDU subheader immediately following the SL-SCH subheader in the MAC header;
  • Each MAC PDU subheader corresponds to one MAC SDU or padding; and the order of each MAC PDU subheader is consistent with the corresponding MAC SDUs or padding order.
  • the first SL-SCH subheader in the MAC PDU includes seven header fields V/R/R/R/R/SRC/DST;
  • the other SL-SCH subheaders in the MAC PDU except the first SL-SCH subheader include a header field DST;
  • All MAC PDU subheaders except the last subheader in the MAC PDU include six header fields R/E1/E/LCID/F/L;
  • the last subheader in the MAC PDU includes four header fields R/E1/E/LCID, and
  • the MAC PDU subheader corresponding to each padding also contains four header fields R/E1/E/LCID.
  • the length of the E1 field in the header field is 1 bit, and the E1 field is used to indicate whether there is a SL-SCH subheader in the MAC header.
  • the E field in the header field is used to indicate whether there are other domains in the MAC header.
  • the E1 field in the MAC PDU subheader is 1, the E field in the MAC PDU subheader is invalid.
  • the scheduling information of the V2X service in the PSSCH is indicated by using an SCI format 1 carried on the PSCCH channel;
  • the value of the Priority field in SCI format 1 is the maximum value of PPPP corresponding to all LCIDs in the MAC PDU.
  • the DST field of the first SL-SCH sub-sub-domain and the DST domain of other SL-SCH sub-heads in the MAC PDU indicate a destination ID
  • each The DST field indicates a different destination ID
  • the sender and the receiver are both terminals.
  • the terminal is a terminal that supports a V2X SideLink communication function.
  • the method for transmitting information to multiple destination IDs based on V2X SideLink communication proposed by the present invention solves the defect that the information cannot be transmitted to multiple destination IDs on the SL-SCH channel in the prior art. Increased resource utilization and transmission delay.
  • FIG. 1 is a schematic diagram of a MAC PDU subheader of a SL-SCH channel transmission in the prior art
  • FIG. 2 and FIG. 3 are schematic diagrams showing SL-SCH MAC subheaders of a SL-SCH channel transmission in the prior art
  • FIG. 4 is a schematic flowchart of a method for transmitting information to multiple destination IDs based on V2X SideLink communication according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a structure of a MAC PDU according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a SL-SCH subheader of only one header field DST field according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a MAC subheader according to an embodiment of the present invention.
  • the embodiment of the invention provides an implementation method for simultaneous transmission of multiple destination IDs based on V2X SideLink communication.
  • the present invention modifies the structure of the MAC header in the MAC PDU in the SL-SCH channel, and specifies that the MAC header of one MAC PDU is composed of one or more SL-SCH subheaders and one or more MAC PDU subheaders, and each The SL-SCH subheader corresponds to one or more MAC PDU subheaders associated with it.
  • a new SL-SCH subheader containing only one header field DST is added to the MAC header, and an E1 field is added to the MAC PDU subheader for the SL-SCH to indicate whether there is an SL in the MAC header.
  • SCH subhead is
  • MAC SDUs corresponding to multiple destination IDs can be multiplexed on one MAC PDU, thereby implementing multiple destination IDs.
  • the implementation method of the invention is simple. When the V2X service is simultaneously transmitted to multiple destination IDs, the transmission delay can be reduced, the overhead of the control channel and the traffic channel can be saved, and the resource utilization rate can be indirectly improved.
  • FIG. 4 is a schematic flowchart of a method for transmitting information to multiple destination IDs based on V2X SideLink communication according to an embodiment of the present invention.
  • the method in this embodiment includes the following steps:
  • the service data unit MAC SDU of each destination ID is multiplexed in one MAC PDU, and the V2X service is transmitted to the receiving method corresponding to all destination IDs through the SL-SCH channel.
  • the MAC SDU corresponding to each destination ID is multiplexed on one MAC PDU supported by the SL-SCH channel.
  • the MAC PDU structure in this embodiment may be a MAC PDU structure for a V2X SideLink communication scenario on the SL-SCH channel.
  • the receiver can monitor the V2X service transmitted in the SL-SCH channel, and if the monitored V2X service has the destination ID to which the receiver belongs, obtain data corresponding to the own destination ID.
  • both the sender and the receiver of the embodiment are peer terminals or user equipments, and the terminal or user equipment supports the V2X SideLink communication function.
  • both the sender and the receiver can be in-vehicle devices.
  • the sender may simultaneously transmit V2X services to multiple destination IDs.
  • the MAC SDU corresponding to multiple destination IDs can be multiplexed on one MAC PDU by modifying the structure of the MAC header in the MAC PDU supported by the SL-SCH channel, in order to implement resource utilization and transmission delay. Simultaneous transmission of V2X services to multiple destination IDs improves resource utilization and transmission delay.
  • the MAC PDU includes: one MAC header, one or more MAC SDUs;
  • the MAC PDU includes: a MAC header, one or more MAC SDUs, and padding.
  • the MAC header is composed of one or more SL-SCH subheaders and one or more MAC PDU subheaders; and within one MAC PDU, each SL-SCH subheader and the SL header in the MAC header Associated with the MAC PDU subheader immediately after the header, each subheader (except The SL-SCH subheader corresponds to a MAC SDU or padding, as shown in Figure 5.
  • each SL-SCH subheader is associated with the MAC PDU subheader immediately following the MAC PDU with the SL-SCH subheader; the MAC PDU subheader associated with each SL-SCH subheader is one or Multiple.
  • Each MAC PDU subheader corresponds to one MAC SDU or padding; and the order of each MAC PDU subheader (except for the SL-SCH subheader) is consistent with the order of the corresponding MAC SDUs or padding.
  • Figure 5 shows the structure of a MAC PDU in which the first subheader is a SL-SCH subheader comprising seven header fields V/R/R/R/R/SRC/DST, at the first There are multiple associated MAC PDU subheaders behind the SL-SCH subheaders;
  • the nth SL-SCH subhead corresponding to the next DST is bolded.
  • the DST field of the first SL-SCH sub-branch in the MAC PDU and the DST field of other SL-SCH sub-heads all indicate a destination ID, and each A DST field indicates a different destination ID.
  • the MAC PDU subheader associated with each SL-SCH subheader is used to indicate service data.
  • the first SL-SCH subheader in the MAC PDU includes seven header fields V/R/R/R/R/SRC/DST;
  • SL-SCH subheaders in the MAC PDU except the first SL-SCH subheader include a header field DST.
  • the header field DST is a new SL-SCH subheader added in this embodiment, and the DST field is 24 bits for carrying the Destination Layer-2 ID (destination ID).
  • an E1 field is added to the MAC PDU subheader of the associated SL-SCH to indicate whether there is a SL-SCH subheader in the MAC header, as shown in FIG. 7.
  • the MAC PDU subheader in addition to the last subheader in the MAC PDU, contains six header fields R/ E1 /E/LCID/F/L.
  • the last subheader in the MAC PDU contains four header fields R/ E1 /E/LCID.
  • the padding corresponding MAC PDU subheader also contains four header fields R/ E1 /E/LCID.
  • all MAC PDU subheaders except the last subheader in the MAC PDU include six header fields R/ E1 /E/LCID/F/L;
  • the last subheader in the MAC PDU includes four header fields R/ E1 /E/LCID,
  • the MAC PDU subheader corresponding to each padding also contains four header fields R/ E1 /E/LCID.
  • the length of the E1 field in the header field is 1 bit, and the E1 field is used to indicate whether there is a SL-SCH subheader in the MAC header in the MAC PDU.
  • the E field in the header field is used to indicate whether there are other domains in the MAC header. If the E1 field in the MAC PDU subheader is 1, the E field in the MAC PDU subheader is invalid.
  • the E1 field is set to "1", it means that there is at least one DST field of the SL-SCH subheader, and the value of the E field in the subheader is ignored. If the E1 field is set to "0", it means that the indication of the E field in the subheader is used.
  • the E field is an extended field and is a flag indicating whether there are other domains in the MAC header. If the E field is set to "1”, it means that there is at least another set of R/R/E/LCID fields. If the E field is set to "0”, it means MAC SDU or padding from the following byte.
  • the structure of the MAC PDU of the V2X sidelink communication in this embodiment enables the sender UE to multiplex the MAC SDUs sent to the multiple destination IDs to one MAC PDU, thereby simultaneously transmitting the V2X service to multiple destination IDs simultaneously.
  • the MAC PDU structure of the present invention is compatible with the case where the sender UE will transmit to a destination ID.
  • the control channel also indicates that the information needs to be adjusted.
  • the scheduling information of the V2X service in the PSSCH is indicated by using the SCI format 1 carried on the PSCCH channel. Where the service data is carried on the PSSCH channel;
  • the value of the Priority field in SCI format 1 is the maximum value of PPPP corresponding to all LCIDs in the MAC PDU.
  • the V2X sidelink communication uses the SCI format 1 to indicate the scheduling information of the PSSCH.

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Abstract

本发明公开一种基于V2X SideLink通信的向多个目的ID传输信息的方法，方法包括：发送方向两个以上的接收方传输V2X业务时，将每一目的ID的服务数据单元MAC SDU复用在一个MAC PDU中通过SL-SCH信道向所有目的ID对应的接收方法传输V2X业务；其中，所述MAC PDU结构为SL-SCH信道上用于V2X SideLink通信场景的MAC PDU结构。本实施例的方法可以实现向多个目的ID传输V2X业务，提高了资源利用率和传输时延。

Description

基于V2X SideLink通信的向多个目的ID传输信息的方法
交叉引用
本申请引用于2016年12月31日提交的专利名称为“基于V2X SideLink通信的向多个目的ID传输信息的方法”的第2016112670323号中国专利申请，其通过引用被全部并入本申请。
技术领域
本发明涉及通信技术，具体涉及一种基于V2X SideLink通信的向多个目的ID(标识)传输信息的方法。
背景技术
V2X(Vehicle to X)即车与外界的信息交换，是未来智能交通运输系统的关键技术。V2X应用将改善驾驶安全性、减少拥堵和车辆能耗、提高交通效率和车载娱乐信息等。它以车对车(V2V，Vehicle-to-Vehicle)、车与行人(V2P，Vehicle-to-Pedestrian)、车对路侧基础设施(V2I，Vehicle-to-Infrastructure)和车与应用服务器(V2N，Vehicle-to-Network)通信为基础，在车-X(V2X：车、路、行人及互联网等)之间，进行无线通讯和信息交换与处理。
目前，3GPP确定了V2X资源池设计，对于V2X资源池设计不同于D2D通信的资源池设计，V2X资源池引入了子信道的概念，即V2X资源池包含一或多个子信道，每个子信道由一组连续的RB(Resource Block，资源块)组成，子信道的大小(sizeSubchannel-r14)是由eNB(evolved Node B，基站)或预配置信息来配置给UE。sizeSubchannel-r14是枚举型的，数值包括n4,n5,n6,n8,n9,n10,n12,n15,n16,n18,n20,n25,n30,n48,n50,n72,n75,n96,n100，其中n4表示4PRBs、n5表示5PRBs，以此类推。UE在资源池选择可用资源时要求以整数倍的连续的子信道来使用资源。
另外，3GPP讨论确定了V2X消息复用SL-SCH(Side Link Synchronization Channel，辅链路同步信道)进行传输，并定义了为V2X sidelink(V2X辅链路)通信传输使用的为SL-SCH的MAC PDU(Media  Access Control介质访问控制Protocol Data Unit协议数据单元)和SL-SCH MAC子头，如图1和图2所示。其中DST域的大小与D2D通信中使用的SL-SCH MAC子头中DST域的大小不同，该DST域是24比特，用于携带Destination Layer-2ID，而D2D通信只携带Destination Layer-2ID中的16个比特信息，如图3所示。V域用于指示SL-SCH子头的格式。当该域设为“0011”时，用于V2X sidelink通信，且DST域为24比特；当设为“0001”或“0010”时，用于D2D通信，且DST域为16比特。
现有的用于V2X sidelink通信的MAC PDU定义为：一个MAC PDU由一个MAC头，一个或多个MAC服务数据单元(MAC SDU)和可选的填充构成。其中一个MAC PDU头由一个SL-SCH子头和一个或多个MAC PDU子头组成，每个子头(除了SL-SCH子头)对应一个MAC SDU(Service Data Unit，服务数据单元)或填充。这种MAC PDU的结构设计决定了一个MAC PDU只能包含一个目的ID的相关MAC SDUs。换言之，发送方UE只能在一个TB块上向一个目的ID传输相关V2X业务，无法在一个TB块上向多个目的ID同时传输。又由于UE在资源池选择可用资源时要以子信道为粒度，而不是以RB为粒度，这样UE未必能够找到恰好的资源，可能出现资源浪费导致频谱利用率降低的现象。另外，多个目的ID对应的MAC SDUs不能复用到一个MAC PDU上，需要单独传输而导致传输时延的增加和控制信道开销的增大。
发明内容
鉴于上述问题，本发明提出了克服上述问题或者至少部分地解决上述问题的一种基于V2X SideLink通信的向多个目的ID传输信息的方法。
为此目的，第一方面，本发明提出一种基于V2X SideLink通信的向多个目的ID传输信息的方法，包括：
发送方向两个以上的接收方传输V2X业务时，将每一目的ID的服务数据单元MAC SDU复用在一个MAC PDU中通过SL-SCH信道向所有目的ID对应的接收方法传输V2X业务；
其中，所述MAC PDU结构为SL-SCH信道上用于V2X SideLink通信场景的MAC PDU结构。
可选地，所述MAC PDU包括：一个MAC头、一个或多个MAC SDU；
或者，
所述MAC PDU包括：一个MAC头、一个或多个MAC SDU和填充。
可选地，所述MAC头由一个或多个的SL-SCH子头、一个或多个的MAC PDU子头组成。
可选地，在一个MAC PDU内，每一个SL-SCH子头与MAC头内该SL-SCH子头后面紧接着的MAC PDU子头相关联；
且与每一个SL-SCH子头关联的MAC PDU子头为一个或多个；
每一个MAC PDU子头对应一个MAC SDU或填充；以及每一个MAC PDU子头的顺序与对应的MAC SDUs或填充的顺序一致。
可选地，所述MAC PDU内的第一个SL-SCH子头包括七个头字段V/R/R/R/R/SRC/DST；
所述MAC PDU内除第一个SL-SCH子头外的其他SL-SCH子头包括一个头字段DST；
所述MAC PDU内除最后一个子头之外的所有MAC PDU子头包括六个头字段R/E1/E/LCID/F/L；
所述MAC PDU内最后一个子头包括四个头字段R/E1/E/LCID，以及
每一填充对应的MAC PDU子头也包含四个头字段R/E1/E/LCID。
可选地，头字段中的E1域长度为1比特，该E1域用于指示MAC头中是否还有SL-SCH子头；
头字段中的E域用于指示MAC头中是否还有其他的域；
若MAC PDU子头中的E1域为1，则该MAC PDU子头中的E域无效。
可选地，对于V2X业务在PSSCH中的调度信息，采用承载在PSCCH信道上的SCI格式1进行指示；
对于SCI格式1中Priority域的数值为MAC PDU中所有LCID对应的PPPP的最大值。
可选地，所述MAC PDU结构包括多个目的ID时，所述MAC PDU内第一个SL-SCH子的DST域和其他SL-SCH子头的DST域都指示一个目的ID，且每一个DST域指示不同的目的ID。
可选地，所述发送方和所述接收方均为终端。
可选地，所述终端为支持V2X SideLink通信功能的终端。
由上述技术方案可知，本发明提出的一种基于V2X SideLink通信的向多个目的ID传输信息的方法，解决了现有技术中无法在SL-SCH信道上向多个目的ID传输信息的缺陷，提高了资源利用率和传输时延。
附图说明
图1为现有技术中的SL-SCH信道传输的MAC PDU子头的示意图；
图2和图3分别为现有技术中的SL-SCH信道传输的SL-SCH MAC子头的示意图；
图4为本发明实施例中基于V2X SideLink通信的向多个目的ID传输信息的方法的流程示意图；
图5为本发明实施例中一种MAC PDU结构的示意图；
图6为本发明实施例中仅一个头字段DST域的SL-SCH子头的示意图；
图7为本发明实施例中MAC子头的示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。
需要说明的是，在本文中，“第一”、“第二”、“第三”、“第四”字样仅仅用来将相同的名称区分开来，而不是暗示这些名称之间的关系或者顺序。
本发明实施例提出一种基于V2X SideLink通信的向多个目的ID同时传输的实现方法。本发明通过修改为SL-SCH信道中MAC PDU中MAC头的结构，并规定一个MAC PDU的MAC头由一个或多个SL-SCH子头和一个或多个MAC PDU子头组成，并且每个SL-SCH子头对应于与其关联的一个或多个MAC PDU子头。同时在MAC头中新增一种只包含一个头字段DST的SL-SCH子头，以及在用于SL-SCH的MAC PDU子头中新增一个E1域来指示MAC头中是否还有SL-SCH子头。这样，多个目的ID对应的MAC SDU可复用一个MAC PDU上，从而实现向多个目的ID 同时传输V2X业务。本发明实现方法简单，当向多个目的ID同时传输V2X业务时，可减少传输时延，节省了控制信道和业务信道的开销，也可能间接地提升了资源利用率。
如图4所示，图4示出了本发明一实施例提供的基于V2X SideLink通信的向多个目的ID传输信息的方法的流程示意图，本实施例的方法包括如下步骤：
101、发送方向两个以上的接收方传输V2X业务时，将每一目的ID的服务数据单元MAC SDU复用在一个MAC PDU中通过SL-SCH信道向所有目的ID对应的接收方法传输V2X业务。
也就是说，本实施例中每一个目的ID对应的MAC SDU复用在SL-SCH信道所支持的一个MAC PDU上。
本实施例中MAC PDU结构可为SL-SCH信道上用于V2X SideLink通信场景的MAC PDU结构。
102、接收方可监听上述SL-SCH信道中传输的V2X业务，若监听的V2X业务中有该接收方所属的目的ID，则获取与自身目的ID对应的数据。
可理解的是，本实施例的发送方和接收方均是对等的终端或用户设备，且该终端或用户设备均支持V2X SideLink通信功能。通常，发送方和接收方均可为车载设备。
也就是说，对于V2X Sidelink通信，发送方可能向多个目的ID同时传输V2X业务。考虑到资源利用率和传输时延，本实施例通过修改为SL-SCH信道所支持的MAC PDU中MAC头的结构，来实现多个目的ID对应的MAC SDU可复用一个MAC PDU上，从而实现向多个目的ID同时传输V2X业务，提高了资源利用率和传输时延。
为更好的理解上述内容，下面给出具体的实现方式：
本实施例中，MAC PDU包括：一个MAC头、一个或多个MAC SDU；
或者，MAC PDU包括：一个MAC头、一个或多个MAC SDU和填充。
其中，上述的MAC头由一个或多个SL-SCH子头、一个或多个MAC PDU子头组成；并且在一个MAC PDU内，每一个SL-SCH子头与MAC头内该SL-SCH子头后面紧接着的MAC PDU子头相关联，每个子头(除 了SL-SCH子头)对应一个MAC SDU或填充，如图5所示。
也就是说，每一个SL-SCH子头与该SL-SCH子头在MAC PDU内后面紧接着的MAC PDU子头相关联；与每一个SL-SCH子头关联的MAC PDU子头为一个或多个。
每一个MAC PDU子头对应一个MAC SDU或填充；以及每一个MAC PDU子头(除了SL-SCH子头之外)的顺序与对应的MAC SDUs或填充的顺序一致。
图5示出了一个MAC PDU的结构，在该MAC PDU中第一个子头为包括七个头字段V/R/R/R/R/SRC/DST的SL-SCH子头，在该第一个SL-SCH子头后面有多个关联的MAC PDU子头；
相应地，如图5中加粗的DST对应的第二个SL-SCH子头，该第二个SL-SCH子头的DST域只携带目的ID，在该第二个SL-SCH子头后面有多个关联的MAC PDU子头；
依次顺序，如图5中加粗的下一个DST对应的第n个SL-SCH子头。
也就是说，若图5中的MAC PDU结构包括多个目的ID，则MAC PDU内第一个SL-SCH子的DST域和其他SL-SCH子头的DST域都指示一个目的ID，且每一个DST域指示不同的目的ID。每一SL-SCH子头关联的MAC PDU子头用于指示业务数据。
如图2和图5所示，所述MAC PDU内的第一个SL-SCH子头包括七个头字段V/R/R/R/R/SRC/DST；
如图6所示，MAC PDU内除第一个SL-SCH子头外的其他SL-SCH子头包括一个头字段DST。
特别说明的是，该头字段DST是本实施例中新增的一种SL-SCH子头，DST域是24比特，用于携带Destination Layer-2ID(目的ID)。
另外，关联SL-SCH的MAC PDU子头中新增一个E1域用于指示MAC头中是否还有SL-SCH子头，如图7所示。
在本实施例中，除MAC PDU内最后一个子头之外，MAC PDU子头包含六个头字段R/E1/E/LCID/F/L。MAC PDU内最后一个子头包含四个头字段R/E1/E/LCID。填充对应的MAC PDU子头也包含四个头字段R/E1/E/LCID。
即，MAC PDU内除最后一个子头之外的所有MAC PDU子头包括六个头字段R/E1/E/LCID/F/L；
MAC PDU内最后一个子头包括四个头字段R/E1/E/LCID，
每一填充对应的MAC PDU子头也包含四个头字段R/E1/E/LCID。
另外，头字段中的E1域长度为1比特，该E1域用于指示MAC PDU内MAC头中是否还有SL-SCH子头；
头字段中的E域用于指示MAC头中是否还有其他的域；若MAC PDU子头中的E1域为1，则该MAC PDU子头中的E域无效。
可理解的是，如果E1域设置为“1”，则表示其后至少有一个SL-SCH子头的DST域，并忽略该子头中E域的数值。如果E1域设置为“0”，表示使用该子头中E域的指示信息。E域为扩展域，是一个标志位，指示MAC头中是否还有其他的域。如果E域设定为“1”，则表示其后至少有另一组的R/R/E/LCID域。如果E域设置为“0”，表示从其后的字节起为MAC SDU或者填充。
需要说明的是，在一个MAC PDU子头内，当该子头中E1域的值设置为1时，应忽略该子头中的E域；当该子头中E1域的值设置为0时，该子头中的E域有效。
本实施例的V2X sidelink通信的MAC PDU的结构，可使得发送方UE将发送给多个目的ID的MAC SDUs复用到一个MAC PDU上，实现了同时向多个目的ID同时传输V2X业务。同时，本发明的MAC PDU结构兼容发送方UE将发送给一个目的ID的情况。
另外，由于传输V2X业务的MAC PDU发生变化，故在控制信道也指示信息也需要调整，本实施例中，对于V2X业务在PSSCH中的调度信息，采用承载在PSCCH信道上的SCI格式1进行指示，其中，业务数据承载在PSSCH信道上；
对于SCI格式1中Priority域的数值为MAC PDU中所有LCID对应的PPPP的最大值。
即，V2X sidelink通信使用SCI格式1来指示PSSCH的调度信息。
本领域的技术人员能够理解，尽管在此所述的一些实施例包括其它实施例中所包括的某些特征而不是其它特征，但是不同实施例的特征的组合 意味着处于本发明的范围之内并且形成不同的实施例。
虽然结合附图描述了本发明的实施方式，但是本领域技术人员可以在不脱离本发明的精神和范围的情况下做出各种修改和变型，这样的修改和变型均落入由所附权利要求所限定的范围之内。

Claims (10)

  1. 一种基于V2X SideLink通信的向多个目的ID传输信息的方法，其特征在于，包括：
    发送方向两个以上的接收方传输V2X业务时，将每一目的ID的服务数据单元MAC SDU复用在一个MAC PDU中通过SL-SCH信道向所有目的ID对应的接收方法传输V2X业务；
    其中，所述MAC PDU结构为SL-SCH信道上用于V2X SideLink通信场景的MAC PDU结构。
  2. 根据权利要求1所述的方法，其特征在于，所述MAC PDU包括：一个MAC头、一个或多个MAC SDU；
    或者，
    所述MAC PDU包括：一个MAC头、一个或多个MAC SDU和填充。
  3. 根据权利要求2所述的方法，其特征在于，所述MAC头由一个或多个SL-SCH子头、一个或多个MAC PDU子头组成。
  4. 根据权利要求3所述的方法，其特征在于，在一个MAC PDU内，每一个SL-SCH子头与MAC头内该SL-SCH子头后面紧接着的MAC PDU子头相关联；
    且与每一个SL-SCH子头关联的MAC PDU子头为一个或多个；
    每一个MAC PDU子头对应一个MAC SDU或填充；以及每一个MAC PDU子头的顺序与对应的MAC SDUs或填充的顺序一致。
  5. 根据权利要求4所述的方法，其特征在于，所述MAC PDU内的第一个SL-SCH子头包括七个头字段V/R/R/R/R/SRC/DST；
    所述MAC PDU内除第一个SL-SCH子头外的其他SL-SCH子头包括一个头字段DST；
    所述MAC PDU内除最后一个子头之外的所有MAC PDU子头包括六个头字段R/E1/E/LCID/F/L；
    所述MAC PDU内最后一个子头包括四个头字段R/E1/E/LCID，以及
    每一填充对应的MAC PDU子头也包含四个头字段R/E1/E/LCID。
  6. 根据权利要求5所述的方法，其特征在于，头字段中的E1域长度为1比特，该E1域用于指示MAC头中是否还有SL-SCH子头；
    头字段中的E域用于指示MAC头中是否还有其他的域；
    若MAC PDU子头中的E1域为1，则该MAC PDU子头中的E域无效。
  7. 根据权利要求1至6任一所述的方法，其特征在于，对于V2X业务在PSSCH中的调度信息，采用承载在PSCCH信道上的SCI格式1进行指示；
    对于SCI格式1中Priority域的数值为MAC PDU中所有LCID对应的PPPP的最大值。
  8. 根据权利要求6所述的方法，其特征在于，所述MAC PDU结构包括多个目的ID时，所述MAC PDU内第一个SL-SCH子的DST域和其他SL-SCH子头的DST域都指示一个目的ID，且每一个DST域指示不同的目的ID。
  9. 根据权利要求1至6任一所述的方法，其特征在于，所述发送方和所述接收方均为终端。
  10. 根据权利要求9所述的方法，其特征在于，所述终端为支持V2X SideLink通信功能的终端。
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