CN112153596B

CN112153596B - Method, equipment and device for organizing and transmitting V2X unicast MAC PDU

Info

Publication number: CN112153596B
Application number: CN201910558244.4A
Authority: CN
Inventors: 谌丽; 赵亚利
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-06-26
Filing date: 2019-06-26
Publication date: 2022-08-30
Anticipated expiration: 2039-06-26
Also published as: CN112153596A

Abstract

The invention discloses a method, a device and a device for organizing and transmitting a V2X unicast MAC PDU, wherein the method comprises the following steps: determining an air interface unique identifier between a sending terminal and a receiving terminal; and using the air interface unique identifier to indicate the organization and transmission of the protocol data unit of the media access control layer. By adopting the invention, flexible organization and transmission of different services during unicast communication between the vehicle and the object terminals can be realized, thereby saving air interface resources, improving transmission efficiency, reducing data transmission delay and improving data transmission reliability.

Description

Method, equipment and device for organizing and transmitting V2X unicast MAC PDU

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a method, a device, and an apparatus for organizing and transmitting a V2X unicast MAC PDU.

Background

Fig. 1 is a schematic diagram of a V2X communication architecture, and as shown, direct communication between devices is a typical communication manner of a V2X (Vehicle to anything) system. Devices and devices in close proximity to each other allow direct communication between the devices. For convenience of description, a direct link between devices, i.e., a D2D (Device-to-Device) link, is defined as a Sidelink, or PC5 interface; the cellular communication link between the Network and the direct communication Device is referred to as a D2N (Device to Network) link, or Uu interface.

Typical direct communication scenarios include the following three:

1. one-to-one communication (unicast) between direct communication terminals;

2. a device can send the same data to all devices in a communication group at a time (multicast);

3. one device can send the same data (broadcast) to all nearby devices at once.

The V2X transmission is identified by a Source address (Source ID) and a Destination address (Destination ID), which are identifiers of the V2X layer, and are used to identify a service, and there may be data transmission of a plurality of logical channels under a pair of Source and Destination addresses (i.e., under a service).

In an LTE (Long Term Evolution) system, services with different target IDs cannot be multiplexed into one MAC PDU (Media Access Control layer Protocol Data Unit, MAC: Media Access Control layer, PDU: Protocol Data Unit, Protocol Data Unit). Fig. 2 is a schematic diagram of a structure of a V2X MAC PDU of an LTE system, where as shown in the figure, a first MAC subheader SL-SCH (Sidelink Shared Channel) subheader is used for identifying a source address and a destination address of data carried by the MAC PDU.

FIG. 3 is a schematic diagram of an SL-SCH MAC subheader structure 1, and FIG. 4 is a schematic diagram of an SL-SCH MAC subheader structure 2, where SRC is the source layer 2 address; DST is the target layer 2 address; v is version information. Fig. 3 is a schematic structural diagram of an SL-SCH MAC subheader V ═ 0001 "and" 0010", fig. 4 is a schematic structural diagram of an SL-SCH MAC subheader V ═ 0011", and the SL-SCH MAC subheader structures are shown in fig. 3 and 4. The subsequent MAC subheader (R/E/LCID/F/L subheader) is used to indicate the transmission data of different logical channels under the source ID/target ID pair (i.e. under different services).

The defects of the prior art are as follows: in the case of V2X unicast, data organization and transmission are not flexible, and radio resources cannot be effectively used.

Disclosure of Invention

The invention provides a method, equipment and a device for organizing and transmitting a V2X unicast MAC PDU (media access control protocol data Unit), which are used for solving the problems that data organization and transmission are not flexible and wireless resources cannot be effectively utilized when a V2X unicast is carried out.

The embodiment of the invention provides a method for organizing and transmitting a V2X unicast MAC PDU, which comprises the following steps:

determining an air interface unique identifier between a sending terminal and a receiving terminal;

and using the air interface unique identification to indicate the organization and transmission of the MAC PDU.

In implementation, the air interface unique identifier is: and the sending terminal and the receiving terminal establish a unique unicast transmission identifier used after the air interface connection of the PC5 interface.

In implementation, the method for indicating the organization and transmission of the MAC PDU by using the air interface unique identifier includes one of the following modes or a combination thereof:

indicating in the scheduling command SCI that the MAC PDU carried by the SL-SCH is a unicast transmission for a specific transmitting terminal and receiving terminal pair; or the like, or, alternatively,

the specific periodic resource is assigned to specific sending terminals and receiving terminals for unicast transmission in the pre-configured resource indication; or the like, or a combination thereof,

scrambling the direct link MAC PDU by using a specific sequence code corresponding to the air interface unique identifier between the sending terminal and the receiving terminal; or the like, or a combination thereof,

and the unique identifier of the air interface is explicitly carried in the MAC PDU of the direct link.

In implementation, when indicated in the scheduling command SCI:

the sending terminal carries a layer 1 identifier representing the air interface unique identifier in the scheduling signaling SCI, and sends the MAC PDU on the SL-SCH resource indicated by the SCI; and/or the presence of a gas in the gas,

and the receiving terminal analyzes the layer 1 identifier carried in the scheduling signaling SCI after receiving the scheduling signaling SCI, determines to receive the SL-SCH resource and the transmission format of the MAC PDU according to whether the received signal is the air interface unique identifier, and receives the MAC PDU sent by the sending terminal according to the SL-SCH resource and the transmission format indicated by the scheduling signaling SCI.

In implementation, upon pre-configuring the resource indication:

the sending terminal determines the pre-configuration resource and sends the MAC PDU on the SL-SCH resource indicated by the pre-configuration resource; and/or the presence of a gas in the gas,

the receiving terminal determines the pre-configured resource, and the receiving terminal receives the MAC PDU on the SL-SCH resource indicated by the pre-configured resource.

In an implementation, the pre-configured resource is configured by a base station; or the like, or a combination thereof,

the pre-configured resource is configured by the sending terminal through an RRC layer of the direct link interface.

In implementation, when the through link MAC PDU explicitly carries the unique identifier of the air interface:

when the sending terminal organizes the MAC PDU, the air interface unique identifier is placed in the first MAC sub PDU of the MAC PDU; and/or the presence of a gas in the gas,

after receiving the MAC PDU, the receiving terminal determines whether unicast transmission is performed between the sending terminal and the receiving terminal by analyzing the first MAC sub PDU, if so, subsequent data content is analyzed, and if not, the MAC PDU is discarded.

In implementation, the MAC sub PDU for placing the unique identifier of the air interface is an MAC subheader that only carries the unique identifier of the air interface, or the MAC sub PDU includes an MAC subheader with an LCID and an MAC CE, where the LCID is used to indicate that the type of the MAC sub PDU is an MAC CE that carries the unique identifier of the air interface, and the MAC CE includes the unique identifier of the air interface.

In an implementation, the method further includes establishing a bearer between the sending terminal and the receiving terminal in one of the following manners or a combination thereof:

respectively configuring RB and logic channels for the services corresponding to each pair of Source ID and Destination ID; or the like, or, alternatively,

and aiming at the load bearing between a pair of sending terminals and receiving terminals, uniformly configuring the number of the logical channel.

In the implementation, when RB and logical channel configuration is performed on each pair of services corresponding to Source ID and Destination ID, the MAC PDU format includes three types of information, i.e., Source ID, Destination ID, and LCID, for uniquely identifying one bearer.

In implementation, when a logical channel number is configured uniformly for bearers between a pair of transmitting terminals and receiving terminals, the MAC PDU format only includes LCID information for uniquely identifying one bearer.

In implementation, when a bearer is established between the transmitting terminal and the receiving terminal, the configuration is performed through RRC signaling between the transmitting terminal and the receiving terminal or through RRC signaling of the V2X terminal by the base station.

An embodiment of the present invention provides a communication terminal, including:

a processor for reading the program in the memory, performing the following processes:

determining an air interface unique identifier between a sending terminal and a receiving terminal when the V2X unicast MAC PDU is organized and transmitted;

using the air interface unique identification to indicate the organization and transmission of the MAC PDU;

a transceiver for receiving and transmitting data under the control of the processor.

indicating in the scheduling command SCI that the MAC PDU carried by the SL-SCH is unicast transmission for a specific transmitting terminal and a receiving terminal; or the like, or, alternatively,

the specific periodic resource is assigned to a specific sending terminal and a specific receiving terminal for unicast transmission in the pre-configured resource indication; or the like, or a combination thereof,

scrambling a direct link MAC PDU by using a specific sequence code corresponding to the unique empty port identifier between the sending terminal and the receiving terminal; or the like, or, alternatively,

In implementation, when indicated in the scheduling command SCI:

when the terminal is used as a sending terminal, the layer 1 identifier representing the air interface unique identifier is carried in the scheduling signaling SCI, and the sending terminal sends the MAC PDU on the SL-SCH resource indicated by the SCI; and/or the presence of a gas in the gas,

when the terminal is used as a receiving terminal, after receiving the scheduling signaling SCI, analyzing the layer 1 identifier carried in the scheduling signaling SCI, determining to receive the SL-SCH resource and the transmission format of the MAC PDU according to whether the unique identifier of the air interface is the unique identifier of the air interface, and receiving the MAC PDU sent by the sending terminal according to the SL-SCH resource and the transmission format indicated by the scheduling signaling SCI.

In an implementation, upon pre-configuring the resource indication:

when the terminal is used as a sending terminal, pre-configuration resources are determined, and MAC PDU is sent on SL-SCH resources indicated by the pre-configuration resources; and/or the presence of a gas in the gas,

when the terminal is used as a receiving terminal, the pre-configuration resource is determined, and the MAC PDU is received on the SL-SCH resource indicated by the pre-configuration resource.

In an implementation, the pre-configured resource is configured by a base station; or the like, or, alternatively,

as a sending terminal, when organizing the MAC PDU, placing the air interface unique identifier in the first MAC sub PDU of the MAC PDU; and/or the presence of a gas in the gas,

and as the receiving terminal, after receiving the MAC PDU, determining whether unicast transmission is performed between the sending terminal and the receiving terminal by analyzing the first MAC sub PDU, if so, analyzing subsequent data content, and if not, discarding the MAC PDU.

and aiming at the load bearing between a pair of sending terminals and receiving terminals, uniformly configuring the number of the logic channel.

In an implementation, when a bearer is established between a transmitting terminal and a receiving terminal, the configuration is performed through RRC signaling between the transmitting terminal and the receiving terminal, or through RRC signaling of a V2X terminal by a base station.

The embodiment of the invention provides a device for transmitting MAC PDU during unicast in V2X, which comprises:

the determining module is used for determining the unique empty identifier between the sending terminal and the receiving terminal;

and the processing module is used for indicating the organization and transmission of the MAC PDU by using the air interface unique identifier.

An embodiment of the present invention provides a computer-readable storage medium storing a computer program for executing the above method for organizing and transmitting V2X unicast MAC PDUs.

The invention has the following beneficial effects:

in the technical solution provided in the embodiment of the present invention, the unique identifier of the air interface between the sending terminal and the receiving terminal is used to indicate the organization and transmission of the MAC PDU, and because the unique identifier of the air interface between the sending terminal and the receiving terminal is introduced to indicate the MAC PDU, the same identifier (unique identifier of the air interface) is not used in a unified manner in the organization and transmission process of the MAC PDU, so that data of a plurality of services (that is, different source IDs and different target IDs may be corresponding) may be multiplexed in one MAC PDU.

Because the organization and transmission of the MAC PDU are not identified by the source ID and the target ID any more, the flexible organization and transmission of different services during unicast communication between V2X terminals can be realized, thereby saving air interface resources, improving transmission efficiency, reducing data transmission delay and improving data transmission reliability.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not limit the invention. In the drawings:

FIG. 1 is a diagram of a V2X communication architecture in the background art;

fig. 2 is a schematic structural diagram of a V2X MAC PDU of an LTE system in the background art;

FIG. 3 is a diagram of a SL-SCH MAC subheader structure 1 in the background art;

FIG. 4 is a diagram of a SL-SCH MAC subheader structure 2 in the background art;

fig. 5 is a schematic flow chart of an implementation of a method for organizing and transmitting a V2X unicast MAC PDU according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a unicast air interface identifier MAC subheader in the embodiment of the present invention;

fig. 7 is a schematic structural diagram of a unicast air interface identifier MAC CE in the embodiment of the present invention;

fig. 8 is a schematic structural diagram of an MAC PDU explicitly carrying an air interface identifier in an embodiment of the present invention;

fig. 9 is a schematic diagram of a logical channel configuration mode 1 according to an embodiment of the present invention;

FIG. 10 is a diagram illustrating the MAC subheader structure of the source and destination addresses in an embodiment of the present invention;

FIG. 11 is a diagram illustrating a data MAC subheader structure according to an embodiment of the present invention;

FIG. 12 is a diagram illustrating a structure of MAC PDU format 1 according to an embodiment of the present invention;

fig. 13 is a schematic diagram of a logical channel configuration mode 2 according to an embodiment of the present invention;

FIG. 14 is a diagram illustrating an R/F/LCID/L MAC subheader structure according to an embodiment of the present invention;

FIG. 15 is a diagram of MAC PDU format 2 according to an embodiment of the present invention;

fig. 16 is a schematic structural diagram of a communication terminal according to an embodiment of the present invention.

Detailed Description

The inventor notices in the process of invention that:

in the prior art, for V2X transmission, services of different source and destination addresses cannot be multiplexed into one MAC PDU, and a sending terminal can only organize transmission of one MAC PDU at a time, which is reasonable for a broadcast mode, because the sending terminal does not determine which terminals receive which services in the broadcast mode, if different services are multiplexed together, unnecessary receiving behaviors of the receiving terminal are increased, and power consumption of the terminal is increased. However, in the case of unicast, the sending terminal and the receiving terminal are determined, and according to the prior art, services with different source and target IDs cannot be multiplexed into one MAC PDU, which limits flexibility of data organization and transmission, and is not favorable for effective use of wireless resources.

Based on this, the embodiment of the present invention provides a transmission scheme for a MAC PDU during unicast in V2X, so as to solve how to reasonably organize a data packet when there are multiple destination addresses during unicast transmission between terminals on a direct link, thereby improving resource utilization and ensuring fast and effective transmission of data. The following describes embodiments of the present invention with reference to the drawings.

In the description, the transmission of the MAC PDU will be described without distinguishing between the transmitting terminal and the receiving terminal, because those skilled in the art can easily apply the scheme to the transmitting terminal and the receiving terminal after understanding the technical principle, but the description will also give an implementation manner of the cooperation between the transmitting terminal and the receiving terminal, and examples to better understand the implementation of the scheme given in the embodiments of the present invention. Such an explanation does not mean that the two terminals must be implemented in cooperation or separately, and actually, when the transmitting terminal and the receiving terminal are implemented separately, it is possible to solve the problems on the transmitting terminal side and the receiving terminal side separately, and when the two terminals are used in combination, a preferable technical effect is obtained.

Fig. 5 is a schematic flow chart of an implementation of the method for organizing and transmitting the V2X unicast MAC PDU, which may include:

step 501, determining an air interface unique identifier between a sending terminal and a receiving terminal;

and 502, indicating the organization and transmission of the MAC PDU by using the air interface unique identifier.

In the scheme, an air interface unique identifier between a sending terminal and a receiving terminal is introduced to indicate the MAC PDU, so that data of multiple services (that is, data of different source IDs and target IDs) can be multiplexed in one MAC PDU.

In the scheme, how to form the MAC PDU from the data of the higher layer (RLC layer) will be explained in the organizing process, which specifically relates to the implementation of the MAC PDU structure, that is, the MAC PDU structure includes the identifier; how to schedule and transmit the MAC PDU at the PC5 interface is explained in the transmission process, specifically, in the scheduling mode section.

In implementation, the air interface unique identifier is: the sending terminal and the receiving terminal use the unique unicast transmission identifier after establishing the air interface connection of the PC5 interface.

Specifically, the unique identifier of the air interface between the sending terminal and the receiving terminal refers to: the unique unicast transmission identifier is formed after the sending terminal and the receiving terminal establish air interface PC5 interface connection, and services of different source IDs and target IDs between the sending terminal and the receiving terminal are associated with the air interface unique identifier. In implementation, the identity may be added to the PC5 interface, which may have the same meaning and usage as the C-RNTI (Cell-Radio Network Temporary Identifier) of the Uu interface.

indicating in the scheduling command SCI that the MAC PDU carried by the SL-SCH is unicast transmission for a specific transmitting terminal and a receiving terminal; or the like, or a combination thereof,

the specific periodic resource is assigned to specific sending terminals and receiving terminals for unicast transmission in the pre-configured resource indication; or the like, or, alternatively,

scrambling the direct link MAC PDU by using a specific sequence code corresponding to the air interface unique identifier between the sending terminal and the receiving terminal; or the like, or, alternatively,

In a specific implementation, the manner of indicating the MAC PDU by the unique identifier of the air interface between the sending terminal and the receiving terminal is one of or a combination of the following four manners, which are described below.

Firstly, the MAC PDU carried by the SL-SCH is indicated in the scheduling command SCI to be unicast transmission for a specific transmitting terminal and a receiving terminal pair.

Indicating MAC PDU carried by SL-SCH is unicast transmission aiming at specific sending terminal and receiving terminal pair in scheduling command SCI (Sidelink Control Information) for scheduling data on SL-SCH for transmission;

in implementation, when indicated in the scheduling command SCI:

The following describes an implementation of the transmitting terminal and the receiving terminal in this manner by way of example.

Example 1:

in this example, the transmitting terminal indicates with the SCI that the transmission on the allocated resource is a unicast transmission between the particular transmitting terminal and the receiving terminal.

A sending terminal:

1: the transmitting terminal carries a layer 1 identifier representing the air interface unique identifier in the SCI, wherein the layer 1 identifier is the air interface unique identifier of unicast between the transmitting terminal and the receiving terminal;

2: the transmitting terminal transmits the MAC PDU on the SL-SCH resource indicated by the SCI.

The receiving terminal:

1: receiving a scheduling signaling SCI of a sending terminal, analyzing a layer 1 identifier carried in the SCI, and determining resource allocation and a transmission format for the receiving terminal;

2: and receiving data transmitted by the transmitting terminal according to the SCI indication SL-SCH resource and the transmission format.

And secondly, the specific periodic resource is appointed to be allocated to a specific sending terminal and a specific receiving terminal for unicast transmission in the pre-configured resource indication.

Specifically, a special sequence (such as SL-RNTI (straight-through link RNTI, Sidelink RNTI; RNTI: Radio Network Temporary Identity) corresponding to a unique air interface identifier between a sending terminal and a receiving terminal is used for scrambling the MAC PDU of the straight-through link;

in implementation, upon pre-configuring the resource indication:

Example 2:

in this example, the pre-configured resource indication carries the unicast identifier associated with the sending terminal and the receiving terminal.

A sending terminal:

1: determining a periodic pre-configured Resource for unicast transmission between a sending terminal and a receiving terminal, where the pre-configured Resource may be configured by a base station or configured by the sending terminal through an RRC (Radio Resource Control) layer of a direct link interface;

2: the transmitting terminal transmits the MAC PDU on the SL-SCH resource indicated by the pre-configured resource.

The receiving terminal:

1: determining a periodic pre-configured resource for unicast transmission between a sending terminal and a receiving terminal, wherein the pre-configured resource can be configured by a base station or can be configured by the sending terminal through an RRC layer of a direct link interface;

2: the receiving terminal receives the MAC PDU on the SL-SCH resource indicated by the pre-configured resource.

And thirdly, scrambling the direct link MAC PDU by using a specific sequence code corresponding to the unique empty port identifier between the sending terminal and the receiving terminal.

Specifically, the specific periodic resource specified in the preconfigured resource indication is allocated to a specific sending terminal and a specific receiving terminal for unicast transmission, and the preconfigured resource may be configured by the base station or configured by the sending terminal through an RRC layer of the direct link interface;

and fourthly, the through link MAC PDU explicitly carries the air interface unique identifier.

Specifically, the air interface identifier may be explicitly carried in the through link MAC PDU, for example, a specific MAC subheader or MAC CE (Control Element) is added to the front end of the through link MAC PDU and used for uniquely identifying unicast transmission.

Fig. 6 is a schematic structural diagram of a unicast air interface identifier MAC subheader, fig. 7 is a schematic structural diagram of a unicast air interface identifier MAC CE, as shown in the figure, a specific MAC subheader is constructed by taking a 16-bit SL-RNTI as an example, as shown in fig. 6; constructing the MAC CE as shown in fig. 7, the MAC CE needs a corresponding MAC subheader indication, and an R/T field in the MAC subheader is related to the following MAC PDU construction.

In specific implementation, when the through link MAC PDU explicitly carries the unique identifier of the air interface:

after receiving the MAC PDU, the receiving terminal analyzes the first MAC sub PDU to determine whether the transmission is unicast transmission between the sending terminal and the receiving terminal, if so, analyzes the subsequent data content, and if not, discards the MAC PDU.

Example 3:

in this example, the sending terminal implicitly carries the air interface identifier of the connection between the sending terminal and the receiving terminal in the MAC PDU.

A sending terminal: when sending the MAC PDU, the sending terminal implicitly carries the unique identifier of the unicast air interface between terminals, for example, scrambling the MAC PDU by using the unique identifier of the unicast air interface between terminals.

The receiving terminal: the receiving terminal analyzes whether the MAC PDU is sent to the receiving terminal according to a rule implicitly carrying an air interface identifier, for example, the MAC PDU is descrambled by using a unicast air interface unique identifier between terminals, and if the MAC PDU is sent to the receiving terminal, the MAC PDU is analyzed and delivered to a high layer.

Example 4:

in this example, the transmitting terminal explicitly carries an air interface identifier for connection between the transmitting terminal and the receiving terminal in the MAC PDU.

A sending terminal: when the sending terminal organizes the MAC PDU, the unique identifier of an air interface between the sending terminal and the receiving terminal is placed at the initial position of the MAC PDU.

Fig. 8 is a schematic structural diagram of an explicit MAC PDU with an air interface identifier, where the position of the air interface unique identifier in the MAC PDU is shown in fig. 8.

The receiving terminal: receiving MAC PDU, analyzing the first MAC sub PDU, determining whether the transmission is unicast transmission between the sending terminal and the receiving terminal, if yes, analyzing the subsequent data content, and if not, discarding the MAC PDU.

The embodiments of examples 1 to 4 can be used in any combination.

In the implementation, the method may further include establishing the bearer between the sending terminal and the receiving terminal in one of the following manners or a combination thereof:

respectively configuring RB and logic channels for the services corresponding to each pair of Source ID and Destination ID; or the like, or a combination thereof,

Specifically, bearer establishment (logical channel configuration) between the transmitting terminal and the receiving terminal may be performed in one of the following manners. The bearer establishment can be performed through the RRC signaling between the terminals or the base station configures the RRC signaling of the V2X terminal.

Mode 1:

and respectively carrying out bearing RB (Radio Bearer) and logical channel configuration on the service corresponding to each pair of Source ID (Source identification) and Destination ID (target identification).

Fig. 9 is a schematic diagram of a Logical Channel configuration mode 1, and as shown in fig. 9, in this way, Source ID + Destination ID + LCID (Logical Channel ID) uniquely identifies a unicast bearer between a sending terminal and a receiving terminal. Correspondingly, the MAC PDU also contains three types of information of Source ID + Destination ID + LCID.

In specific implementation, the RB IDs of each pair of Source ID and Destination ID may be configured separately, that is, the RB IDs corresponding to Source ID1+ Destination ID1 and the RB ID numbers corresponding to Source ID2+ Destination ID2 in fig. 9 may overlap; in fig. 9, the RB ID corresponding to Source ID1+ Destination ID1 and the RB ID number corresponding to Source ID2+ Destination ID2 may be configured in a unified manner.

In implementation, when RB and logical channel configuration is performed on each pair of services corresponding to Source ID and Destination ID, the MAC PDU format includes three types of information, i.e., Source ID, Destination ID, and LCID, for uniquely identifying one bearer.

Specifically, the MAC PDU format of the direct link interface has different MAC PDU formats according to the bearer establishment method between the transmitting terminal and the receiving terminal, and the MAC PDU format in the method 1 is described below.

Corresponding to the bearer establishment mode 1 between the sending terminal and the receiving terminal, the MAC PDU needs to include three types of information, i.e., Source ID + Destination ID + LCID, to uniquely identify a bearer.

Fig. 10 is a schematic diagram of source and destination address MAC subheaders, fig. 11 is a schematic diagram of a data MAC subheader, and fig. 12 is a schematic diagram of a MAC PDU format 1. FIG. 10 is a MAC subheader, or SL-SCH MAC subheader, for identifying source and destination addresses, where the T field is used to distinguish between the source and destination address MAC subheaders and the data MAC subheader; data MAC subheader format as shown in fig. 11, for example, T ═ 0 indicates that the MAC subheader is a source and destination address MAC subheader (or SL-SCH MAC subheader); t ═ 1 denotes a data MAC subheader. As shown in the MAC PDU format in fig. 12, if the MAC PDU explicitly carries the unique identifier between the sending terminal and the receiving terminal, the first MAC sub PDU of the MAC PDU is a unicast identifier sub PDU (the dotted box indicates the part in the figure).

The following is an example.

Example 5:

in this example, the bearer is established between the transmitting terminal and the receiving terminal in the mode 1, and the example also relates to the description of the MAC PDU format corresponding to the mode.

And respectively carrying out bearing RB and logical channel configuration on the service corresponding to each pair of Source ID and Destination ID. The bearer establishment can be performed through the RRC signaling between the terminals or the base station configures the RRC signaling of the V2X terminal. The bearer and corresponding logical channel configuration are shown in fig. 9. Source ID + Destination ID + LCID uniquely identifies a unicast bearer between a sending terminal and a receiving terminal. Correspondingly, the MAC PDU needs to include three types of information, Source ID + Destination ID + LCID. The bearer identifier RB ID may be configured separately for each pair of Source ID and Destination ID, that is, the RB ID corresponding to (Source ID1+ Destination ID1) and the RB ID corresponding to (Source ID2+ Destination ID2) in fig. 9 may overlap; in fig. 9, the RB ID corresponding to (Source ID1+ Destination ID1) and the RB ID corresponding to (Source ID2+ Destination ID2) may be configured in a unified manner.

In the MAC PDU format, there are two types of MAC subheaders: FIG. 10 is a MAC subheader for identifying source and destination addresses, where the T field is used to distinguish between source and destination address MAC subheaders and data MAC subheaders; the data MAC subheader format is shown in fig. 11, for example, T ═ 0 indicates that the data MAC subheader is a source address MAC subheader and a destination address MAC subheader (or SL-SCH MAC subheader); t ═ 1 denotes a data MAC subheader. The MAC PDU format is schematically shown in fig. 12, and the MAC data transmission part is a part indicated by a full solid box.

Mode 2:

fig. 13 is a schematic diagram of a logical channel configuration mode 2, and as shown in fig. 13, logical channel configuration numbers are uniformly assigned to bearers between a pair of transmitting terminals and receiving terminals. In this way, Source ID + Destination ID + RB ID uniquely configures one LCID, and the corresponding Source ID, Destination ID, and bearer number (RB ID) can be deduced by LCID. Correspondingly, the MAC PDU only needs to include the LCID.

Specifically, the MAC PDU format of the direct link interface has different MAC PDU formats according to the bearer establishment method between the transmitting terminal and the receiving terminal, and the MAC PDU format in the equation 2 is explained below. The MAC PDU format in this example corresponds to bearer establishment mode 2 between the transmitting terminal and the receiving terminal, and the MAC PDU only needs to contain LCID.

Fig. 14 is a schematic diagram of an R/F/LCID/L MAC subheader structure, and fig. 15 is a schematic diagram of a MAC PDU format 2. For data transmission, only one MAC subheader is shown in fig. 14, and the corresponding MAC PDU format is shown in fig. 15. If the MAC PDU explicitly carries the unique identifier between the sending terminal and the receiving terminal, the first MAC sub PDU of the MAC PDU is a unicast identifier sub PDU (part indicated by a dashed box).

The following is an example.

Example 6:

in this example, the bearer establishment between the sending terminal and the receiving terminal adopts a mode 2, and the example relates to the description of the format of the corresponding MAC PDU.

As shown in fig. 13, in this manner, Source ID + Destination ID + RB ID uniquely configures one LCID, and the corresponding Source ID, Destination ID, and bearer number (RB ID) can be inverted by the LCID. Correspondingly, the MAC PDU only needs to include the LCID.

For data transmission, only one MAC subheader is shown in fig. 14, the corresponding MAC PDU format is shown in fig. 15, and the MAC data transmission part is a full solid-line frame part.

In the above implementation, when a bearer is established between the transmitting terminal and the receiving terminal, the configuration is performed through RRC signaling between the transmitting terminal and the receiving terminal or through RRC signaling of the V2X terminal by the base station.

Based on the same inventive concept, the embodiment of the present invention further provides a communication terminal, an organization and transmission apparatus for V2X unicast MAC PDU, and a computer readable storage medium, and as the principle of solving the problem of these apparatuses is similar to the organization and transmission method for a V2X unicast MAC PDU, the implementation of these apparatuses may refer to the implementation of the method, and the repeated parts are not described again.

When the technical scheme provided by the embodiment of the invention is implemented, the implementation can be carried out as follows.

Fig. 16 is a schematic structural diagram of a communication terminal, and as shown in the figure, the terminal includes:

the processor 1600, which is used to read the program in the memory 1620, executes the following processes:

a transceiver 1610 for receiving and transmitting data under the control of the processor 1600.

In implementation, the use of the air interface unique identifier to indicate the organization and transmission of the MAC PDU includes one of the following manners or a combination thereof:

In implementation, when indicated in the scheduling command SCI:

In implementation, upon pre-configuring the resource indication:

the pre-configured resource is configured by the sending terminal through the RRC layer of the direct link interface.

and as the receiving terminal, after receiving the MAC PDU, analyzing the first MAC sub PDU to determine whether the transmission is unicast transmission between the sending terminal and the receiving terminal, if so, analyzing subsequent data content, and if not, discarding the MAC PDU.

In fig. 16, among other things, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by the processor 1600 and various circuits of the memory represented by the memory 1620 linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1610 can be a number of elements including a transmitter and receiver providing a means for communicating with various other apparatus over a transmission medium. For different user devices, user interface 1630 may also be an interface capable of interfacing with a desired device, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 1600 is responsible for managing the bus architecture and general processing, and the memory 1620 may store data used by the processor 1600 in performing operations.

The embodiment of the invention provides a device for organizing and transmitting a V2X unicast MAC PDU, which comprises:

the determining module is used for determining the air interface unique identifier between the sending terminal and the receiving terminal;

The specific implementation can be referred to the implementation of the organization and transmission method of the V2X unicast MAC PDU.

An embodiment of the present invention provides a computer-readable storage medium storing a computer program for executing the above-mentioned method for organizing and transmitting V2X unicast MAC PDUs.

For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware in practicing the invention.

In summary, in the technical solution provided in the embodiment of the present invention, an air interface unique identifier between a sending terminal and a receiving terminal is introduced to indicate a MAC PDU, so that data of multiple services (that is, data of different source IDs and target IDs may be multiplexed in one MAC PDU).

Further, in the embodiment, several ways of indicating the MAC PDU by the unique identifier of the air interface between the sending terminal and the receiving terminal are provided; carrying a mapping configuration mode; MAC PDU organization.

Through the technical scheme provided by the embodiment of the invention, flexible organization and transmission of different services during unicast communication between V2X terminals can be realized, so that air interface resources are saved, transmission efficiency is improved, data transmission delay is reduced, and data transmission reliability is improved.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A vehicle-to-everything V2X unicast media access control layer protocol data unit (MAC PDU) organizing and transmitting method is characterized by comprising the following steps:

and indicating the organization and transmission of the MAC PDU by using the air interface unique identifier, wherein the method comprises one or the combination of the following modes:

indicating that MAC PDU carried by a straight-through link shared channel SL-SCH is unicast transmission aiming at a specific sending terminal and a specific receiving terminal in scheduling command straight-through line control information SCI; or the like, or, alternatively,

2. The method of claim 1, wherein the air interface unique identifier is: and the sending terminal and the receiving terminal establish a unique unicast transmission identifier used after the air interface connection of the PC5 interface.

3. The method of claim 1, wherein, when indicated in the scheduling command SCI:

4. The method of claim 1, wherein upon pre-configuring a resource indication:

and the receiving terminal determines the pre-configuration resource and receives the MAC PDU on the SL-SCH resource indicated by the pre-configuration resource.

5. The method of claim 1 or 4, wherein the pre-configured resources are base station configured; or the like, or a combination thereof,

the pre-configured resource is configured by the sending terminal through a Radio Resource Control (RRC) layer of the direct link interface.

6. The method of claim 1, wherein when the air interface unique identifier is explicitly carried in a direct link MAC PDU:

7. The method according to claim 6, wherein the air interface unique identifier is explicitly carried in a through link MAC PDU, and the MAC sub PDU for placing the air interface unique identifier is a MAC subheader only carrying the air interface unique identifier, or the MAC sub PDU includes a MAC subheader with an LCID and a MAC CE, and the LCID is used to indicate that the type of the MAC sub PDU is a MAC CE carrying the air interface unique identifier, and the MAC CE includes the air interface unique identifier.

8. The method of claim 1, further comprising establishing a bearer between a sending terminal and a receiving terminal in one or a combination of the following ways:

respectively configuring Radio Bearer (RB) and a logical channel for services corresponding to each pair of Source identification (Source ID) and target identification (Destination ID); or the like, or a combination thereof,

9. The method of claim 8, wherein when RB and logical channel configuration are performed for each pair of services corresponding to Source ID and Destination ID, the MAC PDU format includes three types of information, i.e., Source ID, Destination ID, and logical channel identifier LCID, for uniquely identifying one bearer.

10. The method of claim 8, wherein when the logical channel numbers are uniformly configured for bearers between a pair of transmitting and receiving terminals, only LCID information is included in a MAC PDU format to uniquely identify one bearer.

11. The method of claim 8, wherein the configuration is performed by RRC signaling between the transmitting terminal and the receiving terminal or by RRC signaling of the V2X terminal by the base station when the bearer is established between the transmitting terminal and the receiving terminal.

12. A communication terminal, comprising:

a transceiver for receiving and transmitting data under the control of the processor;

13. The terminal of claim 12, wherein the air interface unique identifier is: and the sending terminal and the receiving terminal establish a unique unicast transmission identifier used after the air interface connection of the PC5 interface.

14. The terminal of claim 12, wherein when indicated in the scheduling command SCI:

15. The terminal of claim 12, wherein upon pre-configuring the resource indication:

when the terminal is used as a sending terminal, pre-configuration resources are determined, and MAC PDU is sent on SL-SCH resources indicated by the pre-configuration resources; and/or the presence of a gas in the atmosphere,

16. The terminal of claim 12 or 15, wherein the pre-configured resource is base station configured; or the like, or, alternatively,

17. The terminal of claim 12, wherein when the air interface unique identifier is explicitly carried in a direct link MAC PDU:

18. The terminal according to claim 12 or 17, wherein the air interface unique identifier is explicitly carried in a through link MAC PDU, and the MAC sub PDU for placing the air interface unique identifier is an MAC subheader that only carries the air interface unique identifier, or the MAC sub PDU includes an MAC subheader with an LCID and an MAC CE, and the LCID is used to indicate that the type of the MAC sub PDU is an MAC CE that carries the air interface unique identifier, and the MAC CE includes the air interface unique identifier.

19. The terminal of claim 12, further comprising establishing a bearer between a sending terminal and a receiving terminal in one or a combination of the following ways:

20. The terminal of claim 19, wherein when RB and logical channel configuration are performed for each pair of services corresponding to Source ID and Destination ID, the MAC PDU format includes three types of information, i.e., Source ID, Destination ID, and LCID, for uniquely identifying one bearer.

21. The terminal of claim 19, wherein when the logical channel numbers are uniformly configured for bearers between a pair of the transmitting terminal and the receiving terminal, only LCID information is included in a MAC PDU format to uniquely identify one bearer.

22. The terminal of claim 19, wherein the configuration is performed by RRC signaling between the transmitting terminal and the receiving terminal or by RRC signaling of the V2X terminal by the base station when the bearer is established between the transmitting terminal and the receiving terminal.

23. An apparatus for organizing and transmitting V2X unicast MAC PDUs, comprising:

the processing module is used for indicating the organization and transmission of the MAC PDU by using the air interface unique identifier;

the processing module is specifically configured to:

and the through link MAC PDU explicitly carries the air interface unique identifier.

24. A computer-readable storage medium, characterized in that it stores a computer program for executing the method of any one of claims 1 to 11.