CN110769377B

CN110769377B - Communication method and device

Info

Publication number: CN110769377B
Application number: CN201810829612.XA
Authority: CN
Inventors: 罗海燕; 刘菁; 戴明增; 王君
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-07-25
Filing date: 2018-07-25
Publication date: 2021-10-01
Anticipated expiration: 2038-07-25
Also published as: WO2020020209A1; CN110769377A

Abstract

The application discloses a communication method and a communication device, which are used for realizing communication between a sending end and a receiving end through a plurality of interfaces in a multicast scene. The method comprises the steps that a first terminal device receives data 1 from a second terminal device through a first channel, wherein the data 1 comprises a data packet 1 and indication information 1; wherein the first channel is carried on a first wireless interface, such as a PC5 interface; the first terminal equipment receives data 2 multicast by the wireless network equipment through a second channel, wherein the data 2 comprises a data packet 2 and indication information 2, and the data packet 2 comes from the second terminal equipment; the second channel is carried over a second wireless interface, such as a Uu interface or a PC5 interface; the indication information 1 and the indication information 2 respectively have a mapping relation with the indication information 3, and the indication information 3 indicates the multicast service; the first terminal device can determine that the data packet 1 and the data packet 2 are from the same terminal device and belong to the same service, and the data convergence processing is performed on the data packet 1 and the data packet 2 in a convergence protocol layer entity.

Description

Communication method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communication method and apparatus.

Background

In order to further improve the user experience in a communication system, higher demands are made on improving the performance of transmitting data packets. For example, in the car networking supporting V2X (Vehicle to event) communication, it is important to improve the transmission performance of data packets.

In communication systems such as the internet of vehicles, data packets can be directly transmitted between two terminal devices through direct-connection wireless interfaces between the terminal devices. In order to improve the transmission performance of the data packet, a plurality of interfaces may be used for communication between two terminal devices, such as: a direct connection wireless interface between terminal devices and a transfer interface between the terminal devices and a base station.

If the sending end needs to send the data packet to a plurality of receiving ends, the base station can adopt a multicast mode for transmission when transferring the data packet. In this multicast scenario, how to implement communication between a transmitting end and a receiving end through multiple interfaces is worth studying.

Disclosure of Invention

The application provides a communication method and a communication device, which are used for solving the problem in the prior art that how to realize communication between a sending end and a receiving end through a plurality of interfaces in a multicast scene.

In a first aspect, an embodiment of the present application provides a communication method, where the method includes: the method comprises the steps that first terminal equipment receives first data from second terminal equipment through a first channel, wherein the first data comprise a first data packet and first indication information; the first channel is carried on a first wireless interface, and the first wireless interface is a wireless communication interface for direct communication between the first terminal device and the second terminal device; the first terminal equipment receives second data multicast by the wireless network equipment through a second channel, wherein the second data comprises a second data packet and second indication information, and the second data packet is from the second terminal equipment; the second channel is carried on a second wireless interface, and the second wireless interface is a wireless communication interface for the first terminal device to communicate with the wireless network device; the first indication information and the second indication information respectively have a mapping relation with third indication information, and the third indication information is used for indicating multicast service; and the first terminal equipment performs data aggregation processing on the first data packet and the second data packet at an aggregation protocol layer entity based on the mapping relation.

According to the scheme, the third indication information is used for indicating the multicast service, and the first indication information and the second indication information respectively have a mapping relation with the third indication information, so that after the first terminal device receives the data including the first indication information and the data including the second indication information, the data packets respectively included by the two data are determined to belong to the same multicast service from the same terminal device, and then the data convergence processing of the data packets included in the two data is performed by the convergence protocol layer entity.

The terms "first," "second," and the like, as used herein, are exemplary only and are used for descriptive purposes only and not to be construed as indicating or implying relative importance, nor order. In addition, for data, data packets, indication information, various aspects and specific embodiments may be described by using different names for the same content, for example, a second data packet in the first aspect is described by using a data packet in the second aspect. In a specific embodiment, the first data is referred to as data 1, the second data is referred to as data 2, the first data packet is referred to as data packet 1, the second data packet is referred to as data packet 2, the first indication information is referred to as indication information 1, the second indication information is referred to as indication information 2, and the third indication information is referred to as indication information 3.

In one possible design, the method may further include: the first terminal device receives a first message sent by the wireless network device, where the first message includes the first indication information, the second indication information, and the third indication information, where a mapping relationship exists between the first indication information and the third indication information, and a mapping relationship exists between the third indication information and the second indication information.

Through the design, the wireless network device informs the receiving end (first terminal device) of the mapping relationship among the first indication information, the second indication information and the third indication information, so that the first terminal device determines which data packets belong to the same service and need data aggregation processing through the mapping relationship among the first indication information, the second indication information and the third indication information.

In one possible design, the method may further include: the first terminal equipment receives a second message sent by the V2X controller and receives a third message sent by the wireless network equipment; the second message comprises the first indication information and the third indication information, wherein a mapping relation exists between the first indication information and the third indication information, and the third message comprises the third indication information and the second indication information, wherein the mapping relation exists between the third indication information and the second indication information; or, the second message includes the first indication information and a vehicle networking V2X service identifier, wherein the first indication information and the vehicle networking V2X service identifier are mapped, the third message includes the second indication information, the third indication information and the V2X service identifier, wherein the third indication information and the second indication information have a mapping relationship, and the V2X service identifier and the third indication information have a mapping relationship.

The design provides two other ways for the first terminal device to acquire the first indication information, the second indication information and the third indication information, and the mapping relationship among the first indication information, the second indication information and the third indication information.

In a possible design, the first indication information includes a Destination identifier corresponding to the first channel, such as a Destination ID, or the second indication information includes a logical channel identifier or a group radio temporary network identifier G-RNTI of the second channel, or the third indication information includes a multicast service identifier, such as a TMGI or an MBMS session ID.

In one possible design, the first terminal device determines that the second packet is from the second terminal device by: if the second data further comprises fourth indication information, determining that the second data packet is from the second terminal device; the fourth indication information is an identifier of the second terminal device in the first channel, or the fourth indication information is an identifier having a mapping relationship with the identifier of the second terminal device in the first channel.

Illustratively, the fourth indication information may be referred to as indication information 4 in the detailed description.

Through the design, when the wireless network device sends the second data, the indication information for indicating the identifier of the second terminal device in the first channel is sent to the receiving end, so that the receiving end can know the identifier of the second terminal device in the first channel, and thus the second data packet included in the second data and the first data packet sent from the first channel can be determined to be from the same terminal device.

In one possible design, the second channel of the first terminal device is configured with an adaptation layer, and the adaptation layer is located above a packet data convergence protocol PDCP layer of the second channel, or the adaptation layer is located between the packet data convergence protocol PDCP layer of the second channel and a radio link control protocol RLC layer; the adaptation layer of the second packet carries the fourth indication information.

In one possible design, the RLC layer or the medium access control MAC layer or the physical PHY layer of the second packet carries the fourth indication information.

In a second aspect, an embodiment of the present application provides a communication method, where the method includes: the method comprises the steps that wireless network equipment receives first data from second terminal equipment, wherein the first data comprise a data packet and first indication information, and the first indication information is used for indicating multicast service to which the data packet belongs; and the wireless network equipment multicasts second data on a multicast data channel determined according to the first indication information, wherein the second data comprise the data packet and second indication information, and the second indication information is used for indicating the multicast service to which the data packet belongs.

Illustratively, the first data, herein, may be referred to as data 3 in the detailed description section; the second data may be referred to herein as data 2 in the detailed description section, where the packet may be referred to herein as packet 2 in the detailed description section; the first indication information may be referred to as indication information 5 in the detailed description section, and the second indication information may be referred to as indication information 2 in the detailed description section.

The above design provides a way for the wireless network device to acquire the service of the data packet sent by the second terminal device.

In one possible design, when the first indication information includes a multicast service identifier to which the data packet belongs, the wireless network device multicasts the second data on a multicast data channel determined according to the first indication information, including: the wireless network equipment multicasts the second data on a multicast data channel corresponding to the multicast service identifier;

alternatively, the first and second electrodes may be,

when the first indication information includes the destination identifier, the wireless network device multicasts second data on a multicast data channel determined according to the first indication information, including: and the wireless network equipment multicasts the second data on a multicast data channel corresponding to the multicast service identifier according to the mapping relation between the destination identifier and the multicast service identifier.

In one possible design, further comprising: and when the first indication information comprises a multicast service identifier, the wireless network equipment broadcasts the mapping relation between the destination identifier and the multicast service identifier.

Through the design, the wireless network equipment broadcasts the mapping relation between the target identifier and the multicast service identifier in advance, so that the second terminal equipment determines the multicast service identifier according to the target identifier, carries the multicast service identifier on the data sent to the wireless network equipment, and then the wireless network equipment acquires the multicast service to which the data packet included in the data belongs.

In one possible design, further comprising: and the wireless network device receives the mapping relation between the destination identifier and the multicast service identifier from a vehicle networking V2X controller or an operation maintenance management device.

In one possible design, the wireless network device receives first data from a second terminal device, including: the wireless network device receiving the first data from a second terminal device through a third channel; the third channel is carried on a second wireless interface, and the second wireless interface is a communication interface for communication between the wireless network device and the second terminal device.

The destination identifier in the first indication information is a destination identifier corresponding to the third channel.

In one possible design, the second indication information may include a Logical Channel Identity (LCID) or a group radio temporary network identity (G-RNTI).

In one possible design, the wireless network device may add the second indication information to the second data by:

when the first indication information comprises a multicast service identifier, the wireless network equipment adds second indication information into the second data according to a mapping relation between the multicast service identifier and the second indication information; alternatively, the first and second electrodes may be,

when the first indication information includes the destination identifier, the wireless network device adds the second indication information to the second data according to a mapping relationship between the destination identifier and a multicast service identifier and a mapping relationship between the multicast service identifier and the second indication information.

In one possible design, further comprising: before receiving first data from a second terminal device, the wireless network device receives an identifier of the second terminal device in a first channel, which is sent by the second terminal device, wherein the first channel is carried on a first wireless interface, and the first wireless interface is a communication interface for communication between the second terminal device and the first terminal device; the second data multicast by the wireless network device further includes third indication information, where the third indication information is used to indicate that the data packet received by the first terminal device on the multicast data channel is from the second terminal device; the third indication information is an identifier of the second terminal device in the first channel, or the third indication information is an identifier of a mapping relationship with the identifier of the second terminal device in the first channel.

Here, the third indication information may be referred to as indication information 4 in the detailed embodiment section.

In the above design, the second terminal device notifies the wireless network device of the identifier of the second terminal device in the first channel, so that the wireless network device notifies the terminal device to which the data packet belongs to the receiving end through the third indication information, and the receiving end can know from which terminal device the data packet multicast by the wireless network device comes.

In a possible design, when the first data received by the wireless network device further includes an identifier of the second terminal device on the first channel, or an identifier of a mapping relationship with the identifier of the second terminal device on the first channel, the second data multicast by the wireless network device further includes third indication information, where the third indication information is used to indicate that the data packet received by the first terminal device on the multicast data channel is from the second terminal device; the third indication information is an identifier of the second terminal device in the first channel, or the third indication information is an identifier of a mapping relationship with the identifier of the second terminal device in the first channel. The first channel is carried on a first wireless interface, and the first wireless interface is a communication interface for communication between the second terminal device and the first terminal device.

In one possible design, further comprising: and when the third indication information is an identifier having a mapping relationship with the identifier of the second terminal device in the first channel, the wireless network device sends the mapping relationship between the identifier of the second terminal device in the first channel and the third indication information to the first terminal device.

In a third aspect, an embodiment of the present application provides a communication method, including: the wireless network equipment receives first data sent by second terminal equipment through a wireless bearer, wherein the first data comprises a data packet; the wireless network equipment determines the multicast service identifier to which the data packet belongs according to the wireless bearer; and the wireless network equipment multicasts second data on a multicast data channel corresponding to the multicast service identifier, wherein the second data comprises the data packet and first indication information, and the first indication information is used for indicating the multicast service to which the data packet belongs.

In the above scheme, different radio bearers correspond to different multicast service identifiers, so that the wireless network device determines the multicast service corresponding to the data packet through the radio bearer adopted by the data packet sent by the second terminal device.

In one possible design, before the wireless network device receives the first data sent by the second terminal device through the radio bearer, the method further includes:

and the wireless network equipment sends a first message to the second terminal equipment, wherein the first message comprises the mapping relation between the multicast service identifier and the radio bearer identifier corresponding to the radio bearer.

In one possible design, the method may further include: before the wireless network device sends the first message to the second terminal device, the wireless network device receives a second message sent by the second terminal device, where the second message is used to notify the second terminal device that a data packet belonging to the service identified by the multicast service identifier exists to be sent.

In one possible design, the first indication information may include a Logical Channel Identity (LCID) or a group radio temporary network identity (G-RNTI).

In one possible design, further comprising: before receiving first data from a second terminal device, the wireless network device receives an identifier of the second terminal device in a first channel, which is sent by the second terminal device, wherein the first channel is carried on a first wireless interface, and the first wireless interface is a communication interface for communication between the second terminal device and the first terminal device; the second data multicast by the wireless network device further includes second indication information, where the second indication information is used to indicate that the data packet received by the first terminal device on the multicast data channel is from the second terminal device; the second indication information is an identifier of the second terminal device in the first channel, or the second indication information is an identifier of a mapping relationship with the identifier of the second terminal device in the first channel.

In one possible design, when the first data received by the wireless network device further includes an identifier of the second terminal device on the first channel, the second data multicast by the wireless network device further includes fifth indication information indicating that the data packet received by the first terminal device on the multicast data channel is from the second terminal device; the first channel is borne on a first wireless interface, and the first wireless interface is a communication interface for communication between the second terminal device and the first terminal device; the second indication information is an identifier of the second terminal device in the first channel, or the second indication information is an identifier of a mapping relationship with the identifier of the second terminal device in the second channel.

In one possible design, further comprising: and when the second indication information is an identifier having a mapping relationship with the identifier of the second terminal device in the first channel, the wireless network device sends the mapping relationship between the identifier of the second terminal device in the first channel and the second indication information to the first terminal device.

In a fourth aspect, an embodiment of the present application provides a communication method, including: the method comprises the steps that first terminal equipment receives a first data packet sent by second terminal equipment through a first channel; the first channel is carried on a first wireless interface, and the first wireless interface is a wireless communication interface for direct communication between the second terminal device and the first terminal device; the first terminal equipment receives a second data packet sent by the wireless network equipment through a second channel, wherein the second data packet is obtained after the encryption and/or integrity protection processing of the wireless network equipment; the second channel is carried on a second wireless interface, and the second wireless interface is a communication interface for communication between the wireless network device and the first terminal device; and when the first terminal equipment determines that the first data packet and the second data packet need to be subjected to convergence processing, a Packet Data Convergence Protocol (PDCP) layer performs decryption and/or integrity check processing on the second data packet, and performs data convergence processing on the first data packet and the second data packet subjected to decryption and/or integrity protection processing.

Illustratively, when the PDCP layer performs the data convergence processing and the second terminal device uses the PC5 interface (i.e., the first radio interface) for communication, the PDCP layer may not be ciphered. When the LTE or NR Uu interface (i.e. the second radio interface) is adopted, for example, the LTE-Uu interface uses the existing air interface security mechanism, i.e. PDCP layer ciphering. That is to say, when the PC5 interface + the Uu interface is used to transmit the data packet, that is, the first wireless interface is the PC5 interface + the third wireless interface is the Uu interface, the security mechanisms of the channels corresponding to the two interfaces may be different. The fourth aspect is applicable to a scenario where the security mechanisms adopted by the channels corresponding to the two interfaces are different.

In a fifth aspect, an embodiment of the present application provides a communication method, including: the second terminal equipment determines that the first terminal equipment successfully receives the data packet sent by the second terminal equipment; the second terminal equipment sends a transmission stopping instruction to the wireless network equipment, wherein the transmission stopping instruction comprises the serial number information of the data packet; and the transmission stopping indication is used for indicating the wireless network equipment to stop transmitting the data packet corresponding to the serial number information to the first terminal equipment.

In the above scheme, when the sending end and the receiving end transmit data packets in a dual connection manner, if it is determined that the receiving end successfully receives one or more data packets, the wireless network device may be instructed to stop retransmitting the one or more data packets to the receiving end, thereby saving transmission resources.

In one possible design, the determining, by the second terminal device, that the first terminal device successfully receives the data packet sent by the second terminal device includes: and the second terminal equipment receives a status report sent by the first terminal equipment, wherein the status report indicates that the second terminal equipment successfully receives the data packet corresponding to the serial number information.

In a sixth aspect, the present application provides a communication apparatus, which has a function of implementing the first terminal device according to the first aspect or the fourth aspect, for example, the communication apparatus includes a module or a unit or a means (means) corresponding to the step executed by the first terminal device according to the first aspect or the second terminal device, and the function or the unit or the means (means) may be implemented by software, or implemented by hardware executing corresponding software. Alternatively, the communication apparatus has a function of implementing the wireless network device according to any one of the second and third aspects, or a function of the second terminal device according to the fifth aspect.

In a possible design, the communication apparatus includes a processing unit and a transceiver unit, and functions performed by the processing unit and the transceiver unit may correspond to steps performed by the first terminal device according to the first aspect or the fourth aspect, or steps performed by the second terminal device according to the fifth aspect, or steps performed by the wireless network device according to any of the second aspect to the third aspect, which is not described herein again.

In another possible design, the communication apparatus includes a processor, and may further include a transceiver, and the transceiver is configured to transmit and receive signals, and the processor executes program instructions to perform the method performed by the first terminal device in any possible design or implementation manner of the first aspect or the fourth aspect, or to perform the method performed by the wireless network device in any one of the second aspect to the third aspect, or to perform the method performed by the second terminal device in the fifth aspect.

Wherein the communications apparatus can further include one or more memories for coupling with the processor. The one or more memories may be integrated with the processor or separate from the processor, which is not limited in this application.

In a possible manner, the memory holds the necessary computer program instructions and/or data to implement the functionality of the first terminal device referred to in the first or fourth aspect above. The processor may execute the computer program instructions stored in the memory to perform the method performed by the first terminal device in any of the above-mentioned first aspect and any of the possible designs or implementations of the first aspect, or perform the method performed by the first terminal device in any of the above-mentioned fourth aspect and any of the possible designs or implementations of the fourth aspect.

In another possible approach, the memory stores the necessary computer program instructions and/or data to implement the functionality of the wireless network device of the second or third aspect described above. The processor may execute the computer program instructions stored in the memory to perform the method performed by the wireless network device in any of the possible designs or implementations of the second aspect and the second aspect described above, or perform the method performed by the wireless network device in any of the possible designs or implementations of the third aspect and the third aspect described above.

In yet another possible approach, the memory stores the necessary computer program instructions and/or data to implement the functionality of the second terminal device referred to in the fifth aspect above. The processor may execute the computer program instructions stored in the memory to perform the method performed by the second terminal device in any possible design or implementation manner of the fifth aspect.

In a seventh aspect, the present application provides a chip, where the chip may be in communication with a memory, or the chip may include a memory, and the chip executes program instructions stored in the memory to implement corresponding functions of the first terminal device, the second terminal device, or the wireless network device designed in the first to fifth aspects.

In an eighth aspect, the present application provides a computer storage medium storing computer readable instructions that, when executed, cause the respective functions of the first terminal device or the second terminal device or the wireless network device as designed in the first to fifth aspects to be implemented.

In a ninth aspect, the present application also provides a computer program product comprising a software program which, when run on a computer, causes the respective functions of the first terminal device or the second terminal device or the wireless network device as designed in the first to fifth aspects to be implemented.

In a tenth aspect, the present application further provides a communication system, where the communication system includes the first terminal device, and/or the second terminal device, and/or the wireless network device mentioned in the first to seventh aspects.

Drawings

Fig. 1 is a block diagram of a wireless communication system according to an embodiment of the present invention;

fig. 2 is a schematic flowchart of a communication method according to an embodiment of the present application;

fig. 3 is a schematic diagram of a protocol stack architecture according to an embodiment of the present application;

fig. 4 is a schematic diagram of another protocol stack architecture provided in this embodiment of the present application;

fig. 5A is a schematic diagram of another protocol stack architecture provided in this embodiment of the present application;

fig. 5B is a schematic diagram of another protocol stack architecture provided in this embodiment of the present application;

fig. 5C is a schematic diagram of another protocol stack architecture provided in this embodiment of the present application;

fig. 6A is a schematic diagram of another protocol stack architecture provided in this embodiment of the present application;

fig. 6B is a schematic diagram of another protocol stack architecture provided in this embodiment of the present application;

fig. 7 is a schematic flow chart of another communication method provided in the embodiment of the present application;

fig. 8 is a schematic diagram of a PDCP protocol header according to an embodiment of the present application;

FIG. 9 is a schematic structural diagram of an apparatus 900 according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of an apparatus 1000 according to an embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of a base station 1100 according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a terminal device 1200 according to an embodiment of the present application.

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

For ease of understanding, a scenario in which the embodiment of the present application is applied will be described with reference to fig. 1.

Fig. 1 is a wireless communication system to which an embodiment of the present application is applied. The wireless communication system may include a wireless network device 110 and a terminal device. Wireless network device 110 may be a device that communicates with a terminal device. Wireless network devices 110 may provide communication coverage for a particular geographic area and may communicate with terminal devices located within the coverage area.

Fig. 1 exemplarily shows one wireless network device 110 and two terminals (a first terminal device 120 and a second terminal device 130), and optionally, the wireless communication system may include a plurality of wireless network devices, and each wireless network device may include other numbers of terminals within the coverage area, which is not limited in this embodiment of the present application.

Optionally, the wireless communication system may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

In an embodiment of the application, a wireless network device, which may be referred to as a Radio Access Network (RAN) device, may be, for example, a base station, a Transmission and Reception Point (TRP) or an access node, where the access node may specifically be a base station in a global system for mobile communication (GSM) system or a Code Division Multiple Access (CDMA) system, may also be a base station (NodeB) in a Wideband Code Division Multiple Access (WCDMA) system, may also be an evolved node B (eNB) or eNodeB) in an LTE system, or may be a base station device, a small base station device, a wireless access node (WiFi AP), a wireless microwave access base station (WiMAX) in a 5G network, and the like, and is not limited to the base station, the TRP, or the access node.

In the embodiment of the present application, the terminal may include, but is not limited to, a terminal device applied in a vehicle networking, for example, may be a terminal device accessing the vehicle networking, for example, may be a vehicle-mounted terminal device; a terminal, which may also be referred to as an access terminal, User Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user device, etc. The terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capability, a computing device or other processing device connected to a wireless modem, a vehicle mounted device, a wearable device, an internet of things terminal device such as a fire detection sensor, a smart water/electricity meter, a factory monitoring device, etc., or a vehicle networking terminal device.

In the wireless communication system shown in fig. 1, the second terminal device 130 may communicate with the first terminal device 120 through a direct connection wireless interface, where the direct connection wireless interface may be understood as an air interface for direct communication between terminal devices, for example, the direct connection wireless interface may be a PC5 interface in an internet of vehicles, and includes a PC5 interface defined by an LTE system or a PC5 interface defined by a New Radio, that is, an NR system, and is hereinafter collectively referred to as an LTE PC5 and an NR PC 5. Data transmission is carried out between the terminals through the directly-connected wireless interface, and time delay of data transmission between terminal equipment is reduced. The first terminal device 120 may also communicate with the second terminal device 130 through a non-direct connection wireless interface, where the non-direct connection wireless interface may be understood as a wireless interface for communication between the second terminal device 130 and the wireless network device 110 and a wireless interface for communication between the wireless network device 110 and the first terminal device 120, for example, the non-direct connection wireless interface may be a Uu interface, which also includes a Uu interface defined by an LTE system or a Uu interface defined by a new-format NR system, and is hereinafter collectively referred to as an LTE Uu and an NR Uu. In addition, in the embodiment of the present application, the second terminal device 130 serving as the transmitting end and the wireless network device 110 may also communicate with each other by using a PC5 interface.

Currently, the third generation partnership project (3 GPP) is discussing Carrier Aggregation (CA) based data offloading and aggregation of the LTE PC5 interface, wherein the offloading and aggregation of data refers to replication of data packets at the transmitting end (packet replication) and reordering and duplicate packet detection at the receiving end. The data distribution and aggregation involved in the implementation of the present application include two cases: the first case is: replication of packets (packet replication) and offloading of packets (packet split) at the sender, and reordering and duplicate packet detection at the receiver. The second case is the flow of data packets at the transmitting end and the reordering and duplicate packet detection at the receiving end. From the perspective of the transmitting end, the packet replication means that the transmitting end replicates the packet. The data packet distribution means that a sending end sends a plurality of data packets belonging to the same convergence protocol layer entity to a receiving end through a plurality of different channels, and the plurality of data packets can have the same SN number or different SN numbers. For example, the sending end sends a plurality of duplicated data packets that are identical (i.e., have the same SN number) to the receiving end through a plurality of different channels, or sends a plurality of duplicated data packets that are different (i.e., have different SN numbers) to the receiving end through a plurality of different channels. From the perspective of the receiving end, the reordering and duplicate detection of the data packets means that the receiving end sends the data received through different channels to the same convergence layer entity, and performs the reordering and duplicate detection according to the serial number SN of the data packets. The duplicate packet detection means that when the convergence layer entity finds that a certain sequence number SN ═ 2 repeatedly occurs, only one data packet with the sequence number SN ═ 2 is reserved, and other data packets with the sequence number SN ═ 2 are deleted. The sending end can communicate with the receiving end through one channel, and communicates with the wireless network equipment through another channel, so that the wireless network equipment serves as a transfer station and communicates with the receiving end through another channel, and further the sending end communicates with the receiving end through two paths. For convenience of description, in the embodiment of the present application, a channel through which the transmitting end and the receiving end directly communicate is referred to as a first channel, a channel through which the transmitting end and the wireless network device communicate is referred to as a third channel, and a channel through which the wireless network device and the receiving end communicate is referred to as a second channel. The first channel is carried on a direct connection wireless interface of transmission between the sending end and the receiving end, for example, the first channel is carried on a PC5 interface; the second channel is a wireless interface for carrying communication between the wireless network device and the receiving end, such as a Uu interface, and the third channel may carry a wireless interface for carrying communication between the transmitting end and the wireless network, such as a PC5 interface, or a Uu interface.

In addition, for example, the term "and/or" herein is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the embodiment of the application, when the wireless network device communicates with the receiving end, a unicast mode or a multicast mode can be adopted. However, when a multicast mode is adopted, how to realize data distribution and aggregation through communication of a plurality of interfaces between a sending end and a receiving end is worth studying.

In the process of research on dual connectivity in a multicast mode, the applicant finds the following three problems:

the first problem is that: how the receiving end determines which data packets need to be subjected to data distribution and aggregation processing.

The second problem is that: how the receiving end determines that the data packets received through different channels come from the same transmitting end.

The third problem is that: how the base station knows the service corresponding to the data packet from the sending end by multicast.

Based on this, the embodiments of the present application provide a communication method and apparatus, so as to implement data distribution and aggregation between a sending end and a receiving end through multiple interface communications when a multicast mode is adopted. And (5) problems are solved. The method and the device are based on the same inventive concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

First, a communication method provided in an embodiment of the present application will be described in detail. The channel referred to in the present application includes a channel for communication between the terminal device and the terminal device, and a channel for previous communication between the terminal device and the wireless network device. For example, in the description of the present application, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, nor order. For example, the description of the present application adopts the first terminal device and the second terminal device as two ends of the transmission data packet, respectively. The first terminal device can be used as both a sending end and a receiving end, and correspondingly, when the first terminal device is the sending end, the second terminal device is the receiving end, and when the first terminal device is the receiving end, the second terminal device is the sending end. In the embodiment of the application, a first terminal device is taken as a receiving end, and a second terminal device is taken as a sending end. For another example, in the following description, a channel between the transmitting end and the wireless network device is referred to as a third channel, a channel between the wireless network device and the receiving end is referred to as a second channel, and a channel between the transmitting end and the receiving end is referred to as a first channel.

In addition, for the purpose of distinguishing data transmitted between terminal devices through the dual connectivity, in the following description, data transmitted by the first terminal device and the second terminal device through the first channel is referred to as data 1, data multicast by the wireless network device through the second channel is referred to as data 2, and data transmitted by the second terminal device and the wireless network device through the third channel is referred to as data 3. The data described herein is data including a Media Access Control (MAC) layer header. Illustratively, the data includes a data packet, which refers to a data packet only including a header of an aggregation protocol layer. In addition, the data packets included in data 2 and data 3 are illustratively the same.

Referring to fig. 2, a schematic flow chart of a communication method provided in the embodiment of the present application is shown to solve the first problem.

S201, the second terminal device sends data 1 to the first terminal device through the first channel, so that the first terminal device receives the data 1 from the second terminal device through the first channel. The data 1 includes a data packet 1. Data 1 also includes indication information 1 corresponding to data packet 1. The indication information 1 is used to obtain the service identifier to which the data packet 1 belongs.

Wherein the first channel is carried in a first wireless interface, and the first wireless interface is a wireless communication interface for the first terminal device and the second terminal device to directly communicate, such as a PC5 interface.

And S202, the second terminal equipment sends data 3 to the wireless network equipment through the third channel, wherein the data 3 comprises a data packet 2.

It should be noted that, the embodiment of the present application does not limit the execution sequence of S201 and S202.

S203, after the wireless network device receives the data 3 through the third channel, the wireless network device multicasts the data 2 through the second channel, where the data 2 includes the data packet 2. And the first terminal device receives the data 2 multicast by the wireless network device through the second channel, wherein the data 2 comprises the data packet 2. The data 2 further includes indication information 2 corresponding to the data packet 2, and the indication information 2 is used to obtain the service identifier to which the data packet 2 belongs. Wherein the data packet 2 is from the second terminal device. And the second terminal equipment sends data 3 to the wireless network equipment through a third channel, wherein the data 3 comprises the data packet 2. Therefore, after the wireless network device acquires the data packet 2 from the data 3, the wireless network device processes the data packet 2 to obtain the data 2, and multicasts the data through the second channel.

The second channel is carried on a second wireless interface, and the second wireless interface is a wireless communication interface for the first terminal device to communicate with the wireless network device.

The indication information 1 and the indication information 2 have a mapping relation with indication information 3, respectively, and the indication information 3 is used for indicating a multicast service.

And S204, after receiving the data 1 and the data 2, the first terminal device performs data aggregation processing on the data packet 1 and the data packet 2 at an aggregation protocol layer entity based on the mapping relation.

Illustratively, after receiving data 1 and data 2, the first terminal device determines that both data packet 1 and data packet 2 included in data 1 come from the second terminal device, and determines that data packet 1 and data packet 2 belong to the same service based on the mapping relationship, and then performs data aggregation processing on data packet 1 and data packet 2 at an aggregation protocol layer entity corresponding to the second terminal device and the service as a whole. Illustratively, on the receiving end side, there is a corresponding convergence protocol layer entity for each service of each transmitting end. For example, there are a convergence protocol layer entity 11 and a convergence protocol layer entity 12 for the service 1 and the service 2 of the sending end 1, respectively, and a convergence protocol layer entity 21 for the service 1 of the sending end 2.

The indication information 3 is used to indicate a multicast service, and both the indication information 1 and the indication information 2 have a mapping relationship with the indication information 3, that is, two data packets from the same terminal device belong to the same service, that is, the data packet 1 and the data packet 2 from the second terminal device belong to the same service, so that the first terminal device performs data convergence processing on the data packet 1 and the data packet 2 at a convergence protocol layer entity. Illustratively, the data aggregation process includes a packet reordering detection process, or the data aggregation process includes a duplicate packet detection and reordering detection process.

For example, the indication information 1 and the indication information 2 have a mapping relationship with the indication information 3, respectively, and may be a one-to-one mapping relationship among the indication information 1, the indication information 2, and the indication information 3. Or the mapping relationship between the indication information 1 and the indication information 3 may be direct mapping or indirect mapping. Similarly, the mapping relationship between the indication information 2 and the indication information 3 may be direct mapping or indirect mapping.

Illustratively, the indication information 1 may include a Destination identifier of the first channel, and the Destination identifier may be a Destination ID of the PC5 link, such as a Destination Layer 2 identifier (Destination Layer-2 ID), a Destination Layer 2 Group identifier (Destination Layer-2 Group ID), a Media Access Control (MAC) address of the first terminal device, or an IP address of the first terminal device. The indication information 2 may include a Logical Channel Identity (LCID) or a group radio network temporary identity (G-RNTI) of the second channel. The indication information 3 may include a Multicast service identifier, which may be a Temporary Mobile Group Identity (TMGI) or a Multimedia Broadcast Multicast Service (MBMS) session identity (session ID).

Here, the MAC header of the transmission data 2 includes LCID, and it can be described that the indication information 2 included in the transmission data 2 may be LCID. Alternatively, when transmitting data 2, the transmission data 2 may be scrambled by using the G-RNTI, and it can be further explained that the indication information 2 included in the data 2 may be the G-RNTI.

In one possible implementation, the convergence protocol layer may be a Packet Data Convergence Protocol (PDCP) layer. The first channel and the second channel in the first terminal device share the same PDCP layer, and the first channel and the third channel in the second terminal device share the same PDCP layer, see the protocol stack architecture shown in fig. 3. In fig. 3, a first wireless interface carrying a first channel is a direct connection wireless interface for direct communication between a second terminal device and the first terminal device, here, a PC5 interface is taken as an example, a second wireless interface carrying a second channel is a wireless interface for communication between a wireless network device and the first terminal device, here, a Uu interface is taken as an example, a third wireless interface carrying a third channel is a wireless interface for communication between the second terminal device and the wireless network device, here, the Uu interface is taken as an example. For the radio network device, when processing the data 3 sent by the second terminal device, the radio network device does not perform any processing on the PDCP header included in the data 3, and proceeds as a load multicast.

In one possible embodiment, the convergence protocol layer may be a newly added convergence layer in an existing protocol stack architecture, for example, the convergence layer is located above the PDCP layer. That is, convergence layers are added to both the first terminal device and the second terminal device, the first channel and the second channel of the first terminal device share the same convergence layer, and the first channel and the third channel of the second terminal device share the same convergence layer.

In the case that the first radio interface is a PC5 interface, the third radio interface is a Uu interface, and the security mechanisms of the channels corresponding to the two interfaces are different, the third channel of the wireless network device may configure a PDCP layer, as shown in fig. 4. Because the data multicast by the wireless network device may not be encrypted, the wireless network device needs to perform decryption processing on the PDCP layer for receiving the data sent by the second terminal device, and then multicasts the load that does not include the PDCP header through the second channel. When the first terminal device receives the data 2 multicast by the radio network device, the first terminal device does not need to perform decryption processing on the PDCP layer, and based on this, the second channel of the first terminal device may not configure the PDCP layer, as shown in fig. 4.

Under the condition that the first wireless interface is a PC5 interface, the third wireless interface is a Uu interface, and the security mechanisms of the channels corresponding to the two interfaces are the same, that is, the data of the two interfaces are not encrypted. The PDCP layer may also not be configured on the first channel of the wireless network device.

Wherein, newly-increased layer of assembling has following function: 1) for a sending end, adding a protocol header of a convergence layer, wherein the protocol header of the convergence layer contains a sequence number of the convergence layer; 2) for a sending end, after adding a protocol header of a convergence layer, copying a data packet (optional function); 3) for the transmitting end, the processed data packets are respectively sent to one or more associated PDCP entities. In particular, if the duplicate processing is undergone, the transmitting end sends data packets with the same SN number to two or more associated PDCP entities, respectively; 4) for a receiving end, performing a reordering function on the received data packets; 5) for the receiving end, the function of duplicate packet detection is performed on the received data packet. And when the data packet with the specific SN number appears repeatedly, deleting the data packet appearing repeatedly, and only reserving one data packet corresponding to the SN number.

In one possible embodiment, the indication information 1 may be included in a Medium Access Control (MAC) layer or a Radio Link Control (RLC) layer or a Physical (PHY) layer of the data 1.

In a possible implementation, when the indication information 2 is LCID, the LCID may be included in a Medium Access Control (MAC) layer or a Radio Link Control (RLC) layer or a physical layer of the data 2.

In this embodiment of the application, the first terminal device may, but is not limited to, obtain that the indication information 1 and the indication information 2 have mapping relationships with the indication information 3 respectively by:

a first possible implementation: the indication information 1 and the indication information 2 are configured to the first terminal equipment by the wireless network equipment and have direct mapping relation with the indication information 3 respectively. The wireless network equipment sends a message 1 for configuring the mapping relation to the first terminal equipment, wherein the message 1 comprises indication information 1, indication information 2 and indication information 3. Wherein, the message 1 indicates that the indication information 1 and the indication information 3 have a mapping relationship, and the indication information 3 and the indication information 2 have a mapping relationship. Therefore, after the first terminal device receives the message 1, when receiving the data 1 and the data 2, the data packet 1 in the data 1 and the data packet 2 in the data 2 come from the same terminal device, and it is determined that the data packet 1 and the data packet 2 belong to the same multicast service according to the indication information 1 in the data 1 and the indication information 3 in the data 2, so that the data convergence processing is performed on the data packet 1 and the data packet 2 at the convergence protocol layer entity.

The wireless network device may broadcast the message 1, or multicast the message 1, or may directly send the message 1 to the first terminal device.

Illustratively, when the indication information 1 is a destination ID, the indication information 2 is an LCID, and the indication information 3 is a multicast service identifier (TMGI/MBMS session ID), the message 1 may include the destination ID, the LCID, and the multicast service identifier, where the destination ID and the multicast service identifier have a mapping relationship, and the LCID and the multicast service identifier have a mapping relationship, that is, a packet indicated by the destination ID and a packet indicated by the LCID belong to the same service.

When the wireless network device multicasts data through the SCPTM mechanism, a message 1 may be broadcasted/multicasted on a single cell multicast control channel (SC-MCCH), where the message 1 includes SCPTM Configuration information (SCPTM Configuration), and the SCPTM Configuration may include the following information:

1) MBMS Session Info (corresponding indication information 3);

2) G-RNTI (correspondence indication information 2);

3) destination ID (correspondence instruction information 1).

Wherein the MBMS Session Info contains the TMGI and/or MBMS Session ID. When the MBMS Session Info includes the TMGI, the G-RNTI and the Destination ID are in one-to-one correspondence. When the MBMS Session Info contains the MBMS Session ID, the G-RNTI and the Destination ID are in one-to-one correspondence. When the MBMS Session Info includes the TMGI and the MBMS Session ID, the G-RNTI and the Destination ID are in one-to-one correspondence.

When the wireless Network device multicasts data through the MBMS mechanism, a message 1 may be Broadcast/Multicast on the MCCH channel, where the message 1 includes Multicast Broadcast Single Frequency Network MBSFN (Multicast Broadcast Single Frequency Network MBSFN) Area Configuration (Area Configuration), and the MBSFN Area Configuration includes the following information:

1) MBMS Session Info (corresponding indication information 3);

2) LCID (correspondence indication information 2);

3) destination ID (correspondence instruction information 1).

When the MBMS Session Info includes a TMGI, the LCID and the Destination ID are in one-to-one correspondence. When the MBMS Session Info contains the MBMS Session ID, LCID and Destination ID are in one-to-one correspondence. When the MBMS Session Info contains the TMGI and the MBMS Session ID, the LCID and the Destination ID are in one-to-one correspondence.

Illustratively, when the indication information 1 is a Destination ID, the indication information 2 is a G-RNTI, and the indication information 3 is a multicast service identifier, the message 1 may include the Destination ID, the G-RNTI, and the multicast service identifier, and the Destination ID has a mapping relationship with the multicast service identifier, and the G-RNTI has a mapping relationship with the multicast service identifier, that is, a data packet indicated by the Destination ID from the first channel and a data packet indicated by the G-RNTI from the second channel belong to the same service.

A second possible implementation: the indication information 1 and the indication information 3 have indirect mapping relation, and the indication information 2 and the indication information 3 have direct mapping relation, which are configured to the first terminal equipment by the wireless network equipment. The wireless network device sends a message 2 to the first terminal device, wherein the message 2 comprises indication information 1, a service identifier of the internet of vehicles V2X, the indication information 2 and indication information 3. The indication information 1 and the V2X service identifier have a mapping relationship, the V2X service identifier and the indication information 3 have a mapping relationship, and the indication information 3 and the indication information 2 have a mapping relationship. The V2X Service identification may be a Provider Service Identifier (PSID)/ITS Application Identifier (ITS-AIDs).

The wireless network device may broadcast the message 2, or multicast the message 2, or may directly send the message 2 to the first terminal device.

Illustratively, when the indication information 1 is a Destination ID, the indication information 2 is an LCID, and the indication information 3 is a multicast service identifier (TMGI/MBMS session ID), the message 2 may include the Destination ID, PSID/ITS-AIDs, LCID, and the multicast service identifier, and the Destination ID has a mapping relationship with the PSID/ITS-AIDs, the PSID/ITS-AIDs has a mapping relationship with the multicast service identifier, and the LCID has a mapping relationship with the multicast service identifier, that is, a packet indicated by the Destination ID from the first channel and a packet indicated by the LCID from the second channel belong to the same service.

Illustratively, when the indication information 1 is a Destination ID, the indication information 2 is a G-RNTI, and the indication information 3 is a multicast service identifier, the message 2 may include the Destination ID, PSID/ITS-AIDs, G-RNTI, and the multicast service identifier, and the Destination ID and the PSID/ITS-AIDs have a mapping relationship, the PSID/ITS-AIDs and the multicast service identifier have a mapping relationship, and the G-RNTI and the multicast service identifier have a mapping relationship, that is, a packet indicated by the Destination ID from the first channel and a packet indicated by the G-RNTI from the second channel belong to the same service.

In a third possible implementation manner, the V2X controller and the wireless network device configure mapping relationships between the indication information 1, the indication information 2 and the indication information 3 to the first terminal device, respectively. Here, the V2X controller (control function) transmits the message 3 to the first terminal device, and the wireless network device transmits the message 4 to the first terminal device. The message 3 comprises indication information 1 and indication information 3, wherein a mapping relationship exists between the indication information 1 and the indication information 3, and the message 4 comprises the indication information 3 and the indication information 2, wherein the mapping relationship exists between the indication information 3 and the indication information 2.

The mapping relationship between the indication information 1 and the indication information 3 sent by the V2X controller to the first terminal device may be sent by the V2X controller to the wireless network device, and the mapping relationship between the indication information 1 and the indication information 3 is broadcast or multicast by the wireless network device, or the mapping relationship between the indication information 1 and the indication information 3 sent by the V2X controller to the first terminal device. The mapping relationship between the indication information 3 and the indication information 2 may be broadcast or multicast to the first terminal device by the wireless network device.

Illustratively, when the indication information 1 is a Destination ID, the indication information 2 is an LCID, and the indication information 3 is a TMGI/MBMS session ID, the V2X controller indicates to the first terminal device that the Destination ID and the TMGI (or MBMS session ID) have a mapping relationship, that is, the message 3 sent by the V2X controller to the first terminal device may include the Destination ID and the TMGI (or MBMS session ID), and the Destination ID and the TMGI (or MBMS session ID) have a mapping relationship. The radio network device indicates to the first terminal device that the LCID and the TMGI (or the MBMS session ID) have a mapping relationship, that is, the radio network device may include the LCID and the TMGI (or the MBMS session ID) in the message 4 sent to the first terminal device, and the LCID and the TMGI (or the MBMS session ID) have a mapping relationship. Based on this, the first terminal device determines that the data packet indicated by the Destination ID from the first channel and the data packet indicated by the LCID from the second channel belong to the same service.

Illustratively, when the indication information 1 is a Destination ID, the indication information 2 is a G-RNTI, and the indication information 3 is a TMGI (or MBMS session ID), the Destination ID and the TMGI (or MBMS session ID) may be included in the message 3, and the Destination ID and the TMGI (or MBMS session ID) have a mapping relationship, and the G-RNTI and the TMGI (or MBMS session ID) may be included in the message 4, and the G-RNTI and the multicast service identifier have a mapping relationship. Based on this, the first terminal device determines that the data packet indicated by the Destination ID from the first channel and the data packet indicated by the G-RNTI from the second channel belong to the same service.

In a fourth possible implementation manner, the V2X controller and the wireless network device configure the first terminal device, where the indication information 1 and the indication information 3 have an indirect mapping relationship, and the wireless network device configures the first terminal device, where the indication information 2 and the indication information 3 have a direct mapping relationship. The V2X controller sends a message 5 to the first terminal device, wherein the message 5 comprises indication information 1 and a vehicle networking V2X service identifier, and a mapping relation exists between the indication information 1 and the V2X service identifier. The wireless network device sends a message 6 to the first terminal device, wherein the message 6 comprises the V2X service identifier, the indication information 2 and the indication information 3. The V2X service identifier has a mapping relationship with the indication information 3, and the indication information 3 has a mapping relationship with the indication information 2. The V2X service identification may be PSID/ITS-AIDs.

The sending of the mapping relationship between the indication information 1 and the V2X service identifier by the V2X controller to the first terminal device may be sending the mapping relationship between the indication information 1 and the V2X service identifier to the wireless network device by the V2X controller, broadcasting or multicasting the mapping relationship between the indication information 1 and the V2X service identifier by the wireless network device, or sending the mapping relationship between the indication information 1 and the V2X service identifier to the first terminal device by the V2X controller. The mapping relationship between the indication information 3 and the indication information 2 and the mapping relationship between the V2X service identifier and the indication information 3 may be broadcast or multicast to the first terminal device by the wireless network device.

Illustratively, when the indication information 1 is a Destination ID, the indication information 2 is an LCID, and the indication information 3 is a TMGI (or MBMS session ID), the message 5 may include the Destination ID and PSID/ITS-AIDs, and the Destination ID and PSID/ITS-AIDs have a mapping relationship. The message 6 includes PSID/ITS-AIDs, LCID, and TMGI (or MBMS session ID), a mapping relationship exists between PSID/ITS-AIDs and TMGI (or MBMS session ID), and a mapping relationship exists between LCID and TMGI (or MBMS session ID), based on which, the first terminal device determines that a packet indicated by the Destination ID from the first channel and a packet indicated by the LCID from the second channel belong to the same service.

Illustratively, when the indication information 1 is a Destination ID, the indication information 2 is a G-RNTI, and the indication information 3 is a multicast service identifier, the message 5 may include the Destination ID and PSID/ITS-AIDs, and the Destination ID and PSID/ITS-AIDs have a mapping relationship. The message 6 includes PSID/ITS-AIDs, G-RNTI and TMGI (or MBMS session ID), a mapping relation exists between the PSID/ITS-AIDs and the TMGI (or MBMS session ID), and a mapping relation exists between the G-RNTI and the TMGI (or MBMS session ID), so that the first terminal device determines that a data packet indicated by the Destination ID from the first channel and a data packet indicated by the G-RNTI from the second channel belong to the same service.

For example, currently the same receiver on port PC5, i.e., the same Destination ID, may correspond to multiple PCs 5 LCIDs, one for each PC5 LCID. For example, for Destination ID1, it might correspond to PC5LCID 1-4; corresponding to Destination ID of 2 and possibly PC5LCID of 1-2. However, for the multicast condition of the base station, one TMGI/MBMS session corresponds to one LCID or G-RNTI, that is, when the base station multicasts, none of the TMGIs corresponds to multiple LCIDs or multiple G-RNTIs. Therefore, it can be considered that, in practice, the same Destination ID will have only one LCID or G-RNTI on the port of PC5, i.e., the same Destination ID will correspond to only one LCID or G-RNTI. Based on this, when multicasting the data packet transmitted by the second terminal device to the first terminal device, the wireless network device adds LCID to the data 2 contained in the data packet or scrambles the data packet through G-RNTI, the second terminal device sends the data packet to the first terminal device through the direct connection wireless interface PC5 interface, and adds Destination ID to the data 1 contained in the data packet, so that when receiving the data 1 sent by the second terminal device and the data 2 multicast by the wireless network device, the first terminal device determines that the data packet included in the data 1 and the data packet included in the data 2 need to be subjected to data aggregation processing according to the Destination ID included in the data 1 and the LCID or G-RNTI included in the data 2.

The following is a detailed description of the solution provided by the embodiment of the present application to solve the second problem. The solution for problem two may be used in combination with the solution for problem one.

When data sent by a plurality of sending terminals include the same identification of the receiving terminal, the receiving terminal needs to distinguish different sending terminals, so that a data packet sent by the sending terminal through the PC5 interface and a data packet multicast by the base station through the Uu interface are sent to a convergence protocol layer corresponding to the same service sent by the same sending terminal together for convergence processing. Taking the convergence protocol layer as the PDCP layer as an example, it is assumed that the transmitting end Tx1 transmits a packet corresponding to TMGI1 to the receiving end, and the transmitting end Tx2 transmits packets corresponding to TMGI1 and TMGI2 to the receiving end. Then at the receiving end, there are a PDCP entity 11 corresponding to Tx1 and TMGI1, a PDCP entity 21 corresponding to Tx2 and TMGI1, and a PDCP entity 22 corresponding to Tx2 and TMGI 2. If the PDCP entity does not distinguish Tx, then the data packets of TMGI1 of Tx1 and Tx2 are both sent to the same PDCP entity, for example, Tx1 and Tx2 both send data packets with PDCP SN 1-100 via PC5 interface and base station, and the PDCP entity will discard the data packets with duplicate SNs when sorting. In practice, the data packets No. 1-100 of Tx1 and Tx2 are different contents and cannot be deleted. It is necessary to distinguish different PDCP entities for the transmitting end at the receiving end.

After the first terminal device receives data 1 and data 2, how to determine that data packet 1 included in data 1 and data packet 2 included in data 2 are both from the second terminal device is determined. For data 1, the second terminal device sends to the first terminal device through a direct connection wireless interface between the second terminal device and the first terminal device, and an identifier of the second terminal device in the first channel included in the data 1, for example, the identifier of the second terminal device in the first channel is Source ID, so that the first terminal device can determine that the data packet 1 included in the data 1 is from the second terminal device. For the data packet 2, the first terminal device may determine, but is not limited to, that the data packet 2 in the data 2 is from the second terminal device by:

the first method is as follows: the data 2 multicast by the wireless network device may include indication information for indicating the second terminal device, and for convenience of distinguishing from the previous indication information, the indication information for indicating the second terminal device is referred to as indication information 4. So that the first terminal device determines that the data packet 2 included in the data 2 is from the second terminal device when determining that the indication information 4 is included in the data 2.

Illustratively, the indication information 4 may be an identifier of the second terminal device in the first channel. The identity of the second terminal device in the first channel may be a Source identity (Source ID). The Source ID is used to indicate the second terminal device, for example, the Source ID may be address information used for identifying the second terminal device in the first channel, such as an Internet Protocol (IP) address, a Media Access Control (MAC) address, and may also be, for example, identification information or service identification information of the second terminal device. The identification information of the second terminal device may be an ID of the second terminal device in short-range communication, such as a short-range service layer user identifier (ProSe UE ID), a short-range service layer 2 group identifier (ProSe layer 2 group ID), a destination layer 2 identifier (destination layer 2 ID), a fleet plane group identifier (platoon group ID), a multimedia broadcast and multicast service session (multimedia broadcast and multicast service session, MBMS session) identifier, a Temporary Mobile Group Identifier (TMGI), a group identifier on the RAN side (G-RNTI) uniquely assigned by the wireless network device for a specific service, or other identifiers; it may also be an InterNATIONAL Mobile Subscriber Identity (IMSI), or a temporary identifier that may be allocated to the second terminal device in order to protect a privacy network, or location information of the second terminal device, etc.

For example, the indication information 4 may also be an identifier having a mapping relationship with the identifier of the second terminal device in the first channel, and for convenience of description, the identifier having a mapping relationship with the identifier of the second terminal device in the first channel is referred to as an internal identifier. The number of bits occupied by the Source ID of the PC5 interface (the direct connection wireless interface carried in the first channel) is large, and generally, the Source ID occupies 24 bits, and a mapping relationship between the Source ID and the identifier with a small number of occupied bits can be configured in the wireless network device. The wireless network device may broadcast or notify a mapping relationship between the Source ID and the internal identifier through Radio Resource Control (RRC) signaling, where the Source ID1 corresponds to 1 and the Source ID2 corresponds to 2.

In the embodiment of the present application, the wireless network device may obtain the indication information 4 by, but not limited to:

in the first mode, before the wireless network device sends the data 3, the second terminal device sends the identifier of the second terminal device in the first channel to the wireless network device. Thus, when receiving the data 3 from the second terminal device, the wireless network device adds the indication information 4 to the multicast data 2 according to the identifier of the second terminal device in the first channel. And when the first terminal device receives the data 1 and the data 2, determining that the data 2 is the same as the identifier included in the data 1 and used for indicating the second terminal device, and determining that the data packet 1 in the data 1 and the data packet 2 in the data 2 are both from the second terminal device.

In one example, the RLC layer or MAC layer or PHY layer of the data 2 carries the indication information 4. In another example, the second channel of the wireless network device and the second channel of the first terminal device are both configured with adaptation layers, and then the adaptation layer of the data 2 carries the indication information 4. When the convergence protocol layer is the PDCP layer, and in the case that the PDCP layer is not configured by the radio network device, the adaptation layer is located between the PDCP layer and the RLC layer, as shown in fig. 5A. When the convergence protocol layer is a newly added convergence layer, the convergence layer is positioned above the PDCP layer, and the adaptation layer is positioned between the convergence layer and the PDCP layer.

In the embodiment of the present application, the indication information 4 is included in which protocol layer of the first terminal device, and may be a protocol specification, or may be an indication that an adaptation layer is added or an indication that which protocol layer includes the indication information 4 is indicated when the wireless network device configures a broadcast/multicast data channel. It is also possible to add a format in the existing protocol layer, which contains the indication information 4. For example, a format of the MAC subheader is added, and the indication information 4 is included, so that the first terminal device can know the included indication information 4 through the format of the MAC subheader.

For the first manner, after receiving the identifier of the first channel carried by the second terminal device at the PC5 interface, the wireless network device may store a mapping relationship between the identifier of the second terminal device at the third channel carried by the Uu interface and the identifier of the second terminal device at the first channel carried by the PC5 interface. The wireless network equipment receives data 3 sent by the second terminal equipment, wherein the data 3 comprises an identifier of the first terminal equipment in a third channel carried on the Uu interface, so that the wireless network equipment finds the corresponding identifier of the second terminal equipment in the first channel according to the identifier of the third channel of the second terminal equipment, and adds indication information 4 in the data 2 based on the identifier of the second terminal equipment in the first channel.

Illustratively, the identifier carried on the third channel of the Uu interface by the second terminal device may be a cell radio network temporary identifier (C-RNTI). The C-RNTI is a dynamic identifier which is allocated to the second terminal equipment by the wireless network equipment, and the unique identifier is the terminal equipment under a cell air interface.

The second mode is as follows: when the second terminal device sends data 3 to the wireless network device through the third channel, the data 3 includes an identifier of the second terminal device in the first channel or an internal identifier corresponding to the identifier of the second terminal device configured by the wireless network device in the first channel. Thus, when the wireless network device receives the data 3 from the second terminal device, in a manner that the indication information 4 is added to the multicast data 2 according to the identifier of the second terminal device in the first channel, and in another manner, the wireless network device passes through the identifier of the second terminal device in the first channel included in the data 3 or the internal identifier corresponding to the identifier of the second terminal device configured by the wireless network device in the first channel as a load to the first terminal device, that is, when the indication information 4 is the same as the identifier included in the data 3 and used for indicating the second terminal device, for example, the identifier of the second terminal device in the first channel is included in the data 3, and the indication information 4 includes the identifier of the second terminal device in the first channel, for example, when the second terminal device included in the data 3 and configured by the wireless network device corresponds to the internal identifier of the first channel, the indication information 4 also includes an internal identifier corresponding to the identifier of the second terminal device configured by the wireless network device in the first channel. And when the first terminal device receives the data 1 and the data 2, determining that the identifiers included in the data 2 and the data 1 and used for indicating the second terminal device are the same, and determining that the data packet 1 in the data 1 and the data packet 2 in the data 2 are both from the second terminal device.

In one example, the identifier of the second terminal device in the first channel or the internal identifier corresponding to the identifier of the second terminal device in the first channel configured by the wireless network device may be included in the RLC layer, the MAC layer or the PHY layer of the third channel of the data 3.

In another example, if the third channel of the second terminal device is configured with an adaptation layer, the adaptation layer of the data 3 carries an identifier of the second terminal device in the first channel. When the convergence protocol layer is a PDCP layer, the adaptation layer is positioned between the PDCP layer and the RLC layer, when the convergence protocol layer is a newly added convergence layer, the convergence layer is positioned above the PDCP layer, and the adaptation layer is positioned between the convergence layer and the PDCP layer. When the third channel of the second terminal device is configured with the adaptation layer, the adaptation layer may be configured in the second channel of the first terminal device, and the adaptation layer may be configured or not configured on the wireless network device. Referring to the protocol stack architecture shown in fig. 5B, taking a convergence protocol layer as a PDCP layer as an example, when the wireless network device does not configure an adaptation layer, and the wireless network device receives data 3 of the second terminal device, the identifier of the second terminal device in the first channel included in the adaptation layer of the data 3 or the internal identifier corresponding to the identifier of the second terminal device in the first channel configured by the wireless network device is not analyzed, and the identifier of the second terminal device in the first channel included in the adaptation layer of the data 3 or the internal identifier corresponding to the identifier of the second terminal device in the first channel configured by the wireless network device is multicast to the first terminal device as a load, including data 2 sent in the second channel. When the wireless network device configures the adaptation layer, the second channel and the third channel of the wireless network device are both configured with the adaptation layer, as shown in fig. 5C, when the wireless network device receives the data 3 of the second terminal device, the identifier of the second terminal device in the first channel or the internal identifier corresponding to the identifier of the second terminal device configured with the wireless network device in the first channel is obtained from the adaptation layer of the third channel of the data 3, and when the data 2 is multicast, the indication information 4 is added to the adaptation layer of the second channel of the data 2, and the data 2 is multicast.

When the second channel between the second terminal device and the wireless network device is the PC5 link, the wireless network device may directly pass through the Source ID contained in the data packet, where the Source ID is the same as the identifier of the second terminal device in the first channel. Therefore, the wireless network device directly acquires the identifier of the second terminal device in the first channel.

The following is a detailed description of the solution provided by the embodiment of the present application to solve the third problem. The solution corresponding to the third question may be used in combination with the solutions corresponding to the first question and the second question.

Since the first terminal device needs to know the service to which the data packet 2 in the data 2 multicast by the wireless network device belongs, the wireless network device needs to first know the service to which the data packet 2 from the second terminal device belongs, and then send the data packet 2 on the multicast data channel corresponding to the service, so that the first terminal device knows the service to which the data packet 2 multicast by the wireless network device belongs.

In the embodiment of the present application, the service to which the data packet 2 from the second terminal device belongs may be determined in any one of the following manners.

The first possible mode is as follows:

the second terminal device sends data 3 to the wireless network device, the data 3 includes a data packet 2 and indication information 5, and the indication information 5 is used for indicating the multicast service to which the data packet 2 belongs. So that the wireless network device, after receiving the data 3, multicasts the data 2 on the multicast data channel determined according to the indication information 5. Data 2 includes data packet 2 and indication information 2. For the description of the indication information 2, reference may be made to the description in the solution proposed in the above-mentioned problem solving scheme, and details are not described here again.

In a possible embodiment, the indication information 5 may include a multicast service identifier to which the data packet 2 belongs. Based on this, when the wireless network device multicasts the data 2 on the multicast data channel determined according to the indication information 5, the following method may be implemented: and the wireless network equipment multicasts the second data on a multicast data channel corresponding to the multicast service identifier. The multicast service identity may be a TMGI or MBMS session ID. For the description related to the multicast service identifier, reference may be made to the description in the scheme provided for solving the problem, which is not described herein again.

The wireless network device adds the indication information 2 to the data 2 according to the following mode: when the indication information 5 includes the TMGI (or MBMS session ID), the wireless network device adds the indication information 2 to the data 2 according to a mapping relationship between the TMGI (or MBMS session ID) and the indication information 2. For example, if the indication information 2 is LCID, the wireless network device adds LCID to the data 2 according to the mapping relationship between TMGI (or MBMS session ID) and LCID. For example, if the indication information 2 is G-RNTI, the radio network device performs scrambling processing on the data 2 by using G-RNTI according to the mapping relationship between TMGI (or MBMS session ID) and G-RNTI, and multicasts the data 2 through a multicast data channel. The mapping relationship between the TMGI (or MBMS session ID) and the LCID, or the mapping relationship between the TMGI (or MBMS session ID) and the G-RNTI may be multicast or broadcast by the radio network device to the second terminal device. For a specific broadcast or multicast method, reference may be made to the description in the scheme for solving the first problem, which is not described herein again.

In another possible implementation, the indication information 5 may include a destination identifier, and the wireless network device adds the indication information 2 to the data 2 according to a mapping relationship between the destination identifier and the TMGI (or MBMS session ID) and a mapping relationship between the TMGI (or MBMS session ID) and the indication information 2.

Illustratively, the Destination identifier may be a Prose Layer 2 Group ID or a plastic Group ID, Destination Layer-2 Group ID, IP address, MAC address, etc.

Based on this, the wireless network device multicasts the second data on the multicast data channel determined according to the indication information 5, which may be implemented as follows: and the wireless network equipment multicasts the second data on a multicast data channel corresponding to the multicast service identifier according to the mapping relation between the destination identifier and the multicast service identifier.

Illustratively, when the indication information 5 includes a multicast service identifier, the wireless network device broadcasts or multicasts a mapping relationship between the destination identifier and the multicast service identifier. Based on this, when the second terminal device determines the destination identifier corresponding to the destination to which the data packet 2 to be sent is sent, the multicast service identifier is added to the data 3 sent through the third channel according to the mapping relationship between the destination identifier and the multicast service identifier. Based on this, after receiving the data 3, the wireless network device multicasts the data 2 on the multicast data channel corresponding to the multicast service identifier.

The mapping relation between the destination identifier and the multicast service identifier can be configured to the wireless network device by the vehicle networking V2X controller or the operation maintenance management device.

In one possible example, when the second terminal device transmits data 3 to the wireless network device, the indication information 5 may be included in the RLC layer, the MAC layer, or the PHY layer of the data 3.

In another possible example, the third channels of the second terminal device and the wireless network device are both configured with adaptation layers, and the adaptation layer of the data 3 carries the indication information 5. And when the convergence protocol layer is the PDCP layer, the adaptation layer of the second terminal equipment in the third channel is positioned between the PDCP layer and the RLC layer of the third channel of the second terminal equipment. When the convergence protocol layer is a newly added convergence layer, the convergence layer is located above the PDCP layer, the third channel and the first channel of the second terminal device share the same convergence layer, and the adaptation layer of the second terminal device in the third channel is located between the convergence layer and the PDCP layer of the third channel. When the convergence protocol layer of the second terminal device is the PDCP layer, the adaptation layer of the second channel of the radio network device is located above the RLC layer. When the convergence protocol layer of the second terminal device is the newly added convergence layer and the wireless network device is configured with the PDCP layer, the adaptation layer of the third channel of the wireless network device is located above the PDCP layer. When the convergence protocol layer of the second terminal device is the newly added convergence layer and the wireless network device is not configured with the PDCP layer, the adaptation layer of the third channel of the wireless network device is located above the RLC layer of the third channel.

The second possible way is:

and the second terminal equipment sends data 3 to the wireless network equipment through a wireless bearer, wherein the data 3 comprises a data packet 2. After receiving the data 3, the wireless network device determines the multicast service identifier to which the data packet 2 belongs according to the wireless bearer, and the wireless network device multicasts the data 2 on the multicast data channel corresponding to the multicast service identifier. Data 2 includes data packet 2 and indication information 2. For the description of the indication information 2, reference may be made to the description in the solution proposed in the above-mentioned problem solving scheme, and details are not described here again.

Illustratively, before the wireless network device receives the first data sent by the second terminal device through the radio bearer, the method further includes: the wireless network device sends a message for configuring a mapping relationship between the multicast service identifier and the radio bearer identifier corresponding to the radio bearer to the second terminal device, and for distinguishing from the foregoing message, the message for configuring the mapping relationship between the multicast service identifier and the radio bearer identifier corresponding to the radio bearer is referred to as a message 7, where the message 7 includes the mapping relationship between the multicast service identifier and the radio bearer identifier corresponding to the radio bearer.

For example, the radio network device directly configures a radio bearer (DRB)1 corresponding to a service identifier 1 and a DRB2 corresponding to a service identifier 2 for the UE. After that, when the wireless network device receives the data from the DRB1, it can know that the data includes the service identifier 1 corresponding to the data packet. The service identifier 1 and the service identifier 2 may adopt a multicast service identifier, such as a TMGI/MBMS session ID. After receiving the data 3 through the radio bearer, the wireless network device acquires the data packet 2 from the data 3, generates the data 2 based on the data packet 2, determines a multicast service identifier (TMGI/MBMS session ID) corresponding to the radio bearer identifier, and multicasts the data 2 through a multicast data channel corresponding to the multicast service identifier.

Illustratively, before the wireless network device sends the first message to the second terminal device, the second terminal device sends a notification message to the wireless network device, where the notification message is used to notify that a data packet belonging to the service identified by the multicast service identifier exists on the second terminal device to be sent.

For example, the second terminal device requests to establish a specific bearer for a specific service, and the specific second terminal device notifies the wireless network device that a data packet with a service identifier 1 and a service identifier 2 is to be sent, where the service identifier 1 and the service identifier 2 may adopt a multicast service identifier, such as a TMGI/MBMS session ID.

In the embodiment of the application, the security mechanisms of the channels corresponding to the two interfaces are different, and how the wireless network device unicasts the data sent to the wireless network device by the second terminal device to the first terminal device. As applied to this scenario, the protocol stack architecture shown in fig. 6A or 6B may be employed. Wherein, the convergence protocol layer in fig. 6A is at the PDCP layer, and the convergence protocol layer in fig. 6B is a newly added convergence layer. The following describes the scheme provided by the present application in detail by taking the example that the convergence protocol layer is at the PDCP layer.

For example, in a scenario where the PDCP layer is used as a convergence protocol layer, when the second terminal device communicates using the PC5 interface, the PDCP layer may not be encrypted in general. When the LTE or NR Uu interface is adopted, for example, the LTE-Uu interface uses the existing air interface security mechanism, i.e., PDCP layer ciphering. That is to say, when the PC5 interface + the Uu interface is used to transmit the data packet, that is, the first wireless interface is the PC5 interface + the third wireless interface is the Uu interface, the security mechanisms of the channels corresponding to the two interfaces may be different. When the security mechanisms of the channels corresponding to the two interfaces are different, because the unicast data of the wireless network device may not be encrypted in a dual-connection scenario, the wireless network device needs to decrypt the received data sent by the second terminal device first, and then sends the data to the first terminal device through the second channel.

Referring to fig. 7, a schematic flow chart of a communication method provided in the embodiment of the present application is shown.

S701, the second terminal device sends data 1 to the second terminal device through the first channel, so that the first terminal device receives the data 1 sent by the second terminal device through the first channel. Data packet 1 is included in data 1. The first channel is carried on a first wireless interface, and the first wireless interface is a wireless communication interface for direct communication between the second terminal device and the first terminal device.

And S702, the second terminal equipment sends data 3 to the wireless network equipment through a third channel, wherein the data 3 comprises a data packet 2.

The second terminal device encrypts and/or integrity-protects the data packet to be sent to obtain a data packet 2, and sends the data packet 2 included in the data 3 to the wireless network device through the third channel.

For the second terminal device- > wireless network device link, the PDCP entity of the second terminal device first copies and performs a Service Data Unit (SDU) offloading process (or only performs an offloading process). After one of the PDCP SDUs is ciphered and/or integrity protected according to a Uu port key of the second terminal device, e.g., KeNB or KgNB, a PDCP SN number is added (subsequently sent through the Uu interface) to obtain a data packet 2 (the data packet 2 may be a PDCP PDU). The other PDCP SDU is not subject to ciphering and integrity protection but directly adds a PDCP SN number (subsequently transmitted through the PC5 interface) to get packet 1. Specifically, the two PDCP SDUs are incremented by the same PDCP SN number. If the PDCP SDUs are not copied and only shunt processing is carried out, the two PDCP SDUs are added with different PDCP SN numbers. And finally, the PDCP entity of the second terminal device sends the two data packets 1 and 2 to the RLC layer, the MAC layer, and the PHY layer corresponding to different channels, respectively, and processes them to generate data 1 and data 3.

And S703, after receiving the data 3, the wireless network device sends data 2 to the first terminal device through the second channel, wherein the data 2 comprises a data packet 2. The data packet 2 is obtained after being encrypted and/or integrity protected by the wireless network equipment. So that the first terminal device receives the data packet 2 sent by the wireless network device through the second channel.

The second channel is carried on a second wireless interface, and the second wireless interface is a communication interface for communication between the wireless network device and the first terminal device.

And when the wireless network equipment receives the data 3 of the second terminal equipment, deleting the PDCP header of the data 2 to obtain a data packet 2, and decrypting and/or finishing security check processing aiming at the data packet 2. And then the wireless network equipment performs integrity protection (optional), encryption and other processing according to a Uu port key KeNB or a KgNB of the first terminal equipment to obtain a data packet 2, adds a PDCP header for the data packet 2 and other processing to obtain a PDCP PDU, sends the PDCP PDU to an RLC/MAC/PHY for processing to obtain data 2 and sends the data 2 to the first terminal equipment through a Uu interface.

At this time, there is a problem that, for example, the second terminal device performs PDCP forking or copy processing, and transmits a packet with SN equal to 1 via the Uu interface and the PC5 interface, respectively. The radio network device receives the data packet with SN 1, and it needs to be ensured that the first terminal device receives the data packet with SN 1 from Uu, otherwise, confusion may be caused at the first terminal device. Therefore, in the embodiment of the present application, for the case of direct forwarding by the wireless network device, the PDCP SN number sent by the wireless network device to the first terminal device is equal to the PDCP SN number sent by the second terminal device to the wireless network device.

Illustratively, the embodiment of the application can configure the same PDCP header format on the wireless network device and the terminal device. As an example, the PDCP header format may be as shown in fig. 8. In fig. 8D/C is used to indicate a control PDU or a data PDU, and R denotes a reserved bit. For example, the PDCP Sequence Number (SN) length may be 12 bits. Therefore, confusion caused by different lengths of the serial numbers can be avoided, wherein the serial numbers of the data packets analyzed or added by the terminal equipment and the serial numbers of the data packets analyzed or added by the wireless network equipment.

S704, when the first terminal device determines that the data packet 1 and the data packet 2 need to be subjected to convergence processing, the first terminal device performs decryption and/or integrity check processing on the data packet 2 in the PDCP layer, and performs data convergence processing on the data packet 1 and the data packet 2 after decryption and/or integrity protection processing.

For the first terminal device, the PDCP entity of the first terminal device performs different processing on data 2 received by the Uu interface and data 1 received by the PC5 interface, respectively. For example, for data 2 received by the Uu interface, the PDCP header is first deleted to obtain a data packet 2, and then decryption and/or integrity check is performed, and finally the data packet is sent to the reordering and duplicate packet detection module. For data 1 received by the PC5 interface, the PDCP header is first deleted to obtain data packet 1, and then the data packet 1 is directly sent to the reordering and duplicate packet detection module.

In a possible implementation, after receiving the data 3, the wireless network device may determine that the receiving end of the data packet 2 included in the data 3 is the first terminal device by:

the first method is as follows: before the second terminal device sends the data 3 to the wireless network device, the second terminal device sends the identifier of the first terminal device to the wireless network device, for example, the identifier of the first terminal device may be sent to the wireless network device through an RRC message. When the identifier of the first terminal device is an identifier of the first terminal device in the first channel, the identifier of the first terminal device may be an IP address, an MAC address, a ProSe UE ID, a ProSe Layer 2 group ID, a destination Layer 2 ID, a platnoon group ID, an IMSI of the first terminal device, or a service identifier (e.g., MBMS session ID, TMGI, etc.) to which the data packet 2 belongs, address information of a group in which the first terminal device is located or a group identifier of a group in which the second terminal device is located, such as an IP multicast address corresponding to a group in which the first terminal device is located, an MAC multicast address corresponding to a group in which the first terminal device is located, or a group ID of a group in which the first terminal device is located that is allocated by a network.

The second terminal device may obtain the identifier of the first terminal device in the first channel through the PC5 discovery process. When the identifier of the first terminal is the identifier of the first terminal in the second channel, the identifier of the first terminal device may be an identifier C-RNTI used by the radio network device to identify the terminal device. For example, a first terminal device sends a discovery (discovery) message to a second terminal device, where the discovery message includes an identifier of a radio network device to which the second terminal device belongs, a cell identifier, and information such as a C-RNTI allocated to the first terminal device by the radio network device. And the second terminal equipment sends the cell identifier, the C-RNTI and the like of the first terminal equipment to the wireless network equipment. The data 3 sent by the second terminal device includes the cell identifier of the first terminal device, and the radio network device determines the C-RNTI corresponding to the cell identifier of the first terminal device, so as to determine that the receiving end corresponding to the data packet in the data 3 is the first terminal device.

Illustratively, the second terminal device sends the mapping relationship between the identifier of the receiving end and the radio bearer identifier to the wireless network device. Or the second terminal device receives the mapping relationship between the radio bearer identifier configured by the wireless network device and the identifier of the receiving end. For example, DRB ID ═ 1 corresponds to identity 1, and DRB ID ═ 2 corresponds to identity 2. Therefore, when the second terminal device sends the data 3 through the radio bearer identifier, the radio network device may determine, according to the radio data bearer included in the RRC message, the identifier of the corresponding first terminal device in the first channel, and the mapping relationship between the identifier of the first terminal device in the first channel and the C-RNTI of the first terminal device, that the receiving end corresponding to the data packet received through the radio bearer is the first terminal device. Or, the wireless network device may directly determine, according to the radio data bearer included in the RRC message and the identifier of the corresponding first terminal device in the second channel, that the receiving end corresponding to the data packet received through the radio bearer is the first terminal device.

The second method comprises the following steps: the data 3 sent by the second terminal device to the wireless network device comprises the identity of the first terminal device.

In one example, the second terminal device may carry the identity of the first terminal device at the RLC layer or the MAC layer or the PHY layer. In another example, the third channel of the second terminal device and the wireless network device are each configured with an adaptation layer. When the convergence protocol layer is a PDCP layer, the adaptation layer configured on the second terminal device is located between the PDCP layer of the second terminal device and the RLC layer of the third channel, the adaptation layer configured on the wireless network device is located between the PDCP layer of the third channel and the RLC layer of the wireless network device, and the third channel and the first channel of the second terminal device share the same PDCP layer. When the convergence protocol layer is a newly added convergence layer, the third channel and the first channel of the second terminal device share the same convergence layer, the adaptation layer configured by the second terminal device is located between the convergence layer of the second terminal device and the PDCP layer of the third channel, and the adaptation layer configured by the wireless network device is located on the PDCP layer of the third channel of the wireless network device.

When the identifier of the first terminal device is the identifier of the first terminal device in the first channel, and after the wireless network device receives the data 3, when the identifier of the first terminal device is obtained, according to the mapping relation between the identifier of the first terminal device and the C-RNTI of the first terminal device, the receiving end corresponding to the data packet in the data 3 is determined to be the first terminal device.

When the identifier of the first terminal device is the identifier of the first terminal device in the second channel, after the wireless network device receives the data 3, the identifier of the first terminal device in the second channel is obtained, and a receiving end corresponding to the data packet in the data 3 is determined to be the first terminal device.

In addition, in the embodiment of the present application, when the sending end uses dual connection to transmit a data packet, there may be data packets that are repeatedly transmitted on two interfaces, and when a data packet transmitted by the sending end on one of the interfaces has successfully arrived at the receiving end, the sending end may stop transmitting the data packet again on the other interface in order to save transmission resources. The application scenario is suitable for a situation that the second terminal device sends a data packet to the first terminal device through the first wireless interface, sends a data packet to the wireless network device through the third wireless interface, transfers the data packet to the first terminal device through the wireless network device, and sends the data packet to the first terminal device through the second wireless interface.

Based on this, this application embodiment provides a communication method. And the second terminal equipment determines that the first terminal equipment successfully receives the data packet sent by the second terminal equipment, and the second terminal equipment stops sending the data packet to the first terminal equipment through the wireless network equipment. The packet referred to herein may be one packet or a plurality of packets.

In a possible implementation manner, the second terminal device may determine that the first terminal device successfully receives the data packet sent by the second terminal device by:

and the second terminal equipment receives a status report sent by the first terminal equipment, wherein the status report indicates that the second terminal equipment successfully receives the data packet corresponding to the serial number information.

Illustratively, the convergence protocol layers of the first terminal device and the second terminal device support the functionality of generating and parsing status reports. After receiving the data packet sent by the second terminal device, the first terminal device generates a status report and sends the status report to the second terminal device, so that the second terminal device determines the data packet which stops transmission according to the status report. The convergence protocol layer may be a PDCP layer or a newly added convergence layer, which may be referred to the related description of the convergence protocol layer, and is not described herein again.

Illustratively, the first terminal device may periodically generate and transmit a status report to the second terminal device. The first terminal device may generate a status report and send the status report to the second terminal device when receiving the trigger message sent by the second terminal device.

In a possible implementation manner, the second terminal device stops sending the data packet to the first terminal device through the wireless network device, which may be implemented as follows:

the first method is as follows: and when the second terminal equipment does not transmit the data packet successfully received by the first terminal equipment to the wireless network equipment, the second terminal equipment stops sending the data packet successfully received by the first terminal equipment to the wireless network equipment.

For example, when the second terminal device determines that one or more data packets of the specific SN number have been successfully sent to the first terminal device through the direct-connection wireless interface between the second terminal device and the first terminal device, the second terminal device stops sending the data packets to the wireless network device.

The second method comprises the following steps: when the second terminal device has transmitted the data packet successfully received by the first terminal device to the wireless network device, the second terminal device may send a transmission stop instruction to the wireless network device, where the transmission stop instruction includes the sequence number information. And the transmission stopping indication is used for indicating the wireless network equipment to determine to stop the data packet transmitted to the first terminal equipment according to the serial number information.

Illustratively, the sequence number information included in the stop transmission instruction may be sequence number information of a packet whose transmission is to be stopped, or may be sequence number information of a packet that is not successfully transmitted. The sequence number information of the data packet whose transmission needs to be stopped may also be referred to as sequence number information of a data packet that has been successfully received by the first terminal device.

The sequence number information of the data packet to be stopped from being transmitted may include a sequence number of each data packet to be stopped from being transmitted, or a sequence number range of a plurality of consecutive sequence numbers to be stopped from being transmitted, for example, a data packet with an SN of 50-100 stops being transmitted, or start sequence numbers of a plurality of data packets to be stopped from being transmitted, for example, data packets starting from an SN of 50 stop being transmitted, or a maximum sequence number of a plurality of data packets to be stopped from being transmitted, for example, a data packet with a sequence number smaller than an SN of 100 stop being transmitted.

The transmission stop instruction may directly include a status report, where the status report includes sequence number information of a data packet that has been successfully received by the first terminal device.

The sequence number information of the unsuccessfully received data packet may include a sequence number of a first unsuccessfully received data packet, or a sequence number range of a plurality of consecutive sequence numbers of unsuccessfully received data packets, or a maximum sequence number of a plurality of consecutive sequence numbers of unsuccessfully received data packets, or a starting sequence number of a plurality of unsuccessfully received data packets.

Illustratively, the stop transmission indication may include a starting SN number and a bitmap. Each bit in the bitmap is used to indicate whether the SN number packet corresponding to the bit needs to stop transmission, for example, 0 indicates to continue transmission, and 1 indicates to stop transmission. For example, if the initial SN is 100, the bitmap is 10011011, the SN is 100 corresponding to the 1 st bit in the bitmap, the 1 st bit is 1, the data packet with SN being 100 stops transmission, the SN is 101 corresponding to the 2 nd bit in the bitmap, the 2 nd bit is 0, the data packet with SN being 101 continues transmission, and so on, the SN is 103, 104, 106, 107 stops transmission, and the data packet with SN being 102, 105 continues transmission.

In this embodiment, the wireless network device may also have a function of parsing the status report. And the wireless network equipment receives the status report sent by the first terminal equipment. And the wireless network equipment determines whether the data packet received from the second terminal equipment needs to be continuously transmitted to the first terminal equipment or not according to the status report. For example, if the status report shows that the data packet of the specific SN has been successfully transmitted, the wireless network device reads the SN number in the status report, finds that the data packet of the specific SN has not been transmitted to the first terminal device through Uu, and stops or cancels the transmission. The subsequent wireless network device may forward the status report to the second terminal device, where the status report may be an original status report fed back by the first terminal device, or may be a status report obtained by deleting, by the wireless network device, an SN number of a data packet that has been received and sent by the second terminal device.

The above-mentioned manner of status report may be applied to a scenario where the RLC layer on the first radio interface of the terminal device has no ACK/NACK mechanism. When the terminal equipment has an RLC ACK/NACK mechanism, the second terminal equipment judges whether the transmission of the data packet transmitted by the convergence protocol layer is successful or not (the transmission condition of the data packet branched by the first wireless interface is determined) according to the RLC ACK/NACK mechanism of the first wireless interface. For example, when a certain RLC PDU receives an ACK reply, the second terminal device determines whether the data packet corresponding to the SN is successfully sent according to the correspondence between the internal RLC PDU and the SN. And if the data packet corresponding to the SN is not sent to the wireless network equipment, the second terminal equipment stops sending the data packet corresponding to the SN to the wireless network equipment through the third wireless interface. If the second terminal device determines that the one or more data packets corresponding to the SNs have been successfully transmitted through the first wireless interface and has sent the one or more data packets corresponding to the SNs to the wireless network device, the second terminal device may stop transmitting the indication to the wireless network device, and a specific implementation manner may refer to a second implementation manner in an implementation manner in which the second terminal device stops sending the data packets to the first terminal device through the wireless network device.

In addition, in the embodiment of the present application, when the sending end uses dual connection to transmit a data packet, there may be data packets that are repeatedly transmitted on two interfaces, and when a data packet transmitted by the sending end on one of the interfaces has successfully arrived at the receiving end, the sending end may stop transmitting the data packet again on the other interface in order to save transmission resources. The method can also be applied to communication between the first terminal device and the second terminal device through two direct-connection wireless interfaces. In the following, the direct connection wireless interfaces are all PC5 interfaces as an example. For ease of distinction, the two direct connection wireless interfaces are referred to as PC 51 and PC 52. It is assumed that the RLC ACK/NACK mechanism exists for the PC5 interface. The second terminal device knows the actual receiving condition of the convergence protocol layer of the first terminal device (for example, according to the internal corresponding relationship between the RLC PDU and the SN) based on the RLC ACK/NACK fed back by the first terminal device at PC 51, and stops the data packets from being transmitted continuously at PC 52 if it is determined that the data packets corresponding to a certain SN have been transmitted successfully at PC 51.

Based on the same inventive concept as the above method embodiment, as shown in fig. 9, the present application further provides a communication apparatus 500, which may include a transceiver 901 and a processing unit 902.

In a possible implementation, the communication apparatus 900 may be applied to a first terminal device, and the transceiving unit 901 may be configured to receive data 1 and data 2 from a second terminal device through a first channel and a second channel, or receive configuration information from a wireless network device, and the like; the processing unit 902 may be configured to process the data 1 and the data 2, for example, perform data aggregation processing on the data packet 1 included in the data 1 and the data packet 2 included in the data 2, and specifically, the processing unit 902 may be configured to implement the function executed by the first terminal device in any of the above method embodiments.

Illustratively, the transceiving unit 901 receives data 1 from the second terminal device through the first channel, where the data 1 includes a data packet 1 and indication information 1; the first channel is carried on a first wireless interface, and the first wireless interface is a wireless communication interface for direct communication between the first terminal device and the second terminal device;

the transceiver 901 receives data 2 multicast by the wireless network device through a second channel, where the data 2 includes a data packet 2 and indication information 2, and the data packet 2 is from the second terminal device; the second channel is carried on a second wireless interface, and the second wireless interface is a wireless communication interface for the first terminal device to communicate with the wireless network device.

Based on the mapping relationship, the processing unit 902 performs data aggregation processing on the data packet 1 and the data packet 2 received through the transceiving unit 901 at the convergence protocol layer entity.

In a possible implementation manner, the communication apparatus 900 may be applied to a second terminal device, and the processing unit 902 may be configured to generate a data packet and add information at a corresponding layer of the data packet, and may specifically be configured to implement the function performed by the second terminal device according to any of the foregoing embodiments; a transceiving unit 901 operable to transmit data packet 1 and data packet 2 to a first terminal device via two different channels.

In a possible implementation manner, the communication apparatus 900 may be applied to a wireless network device, the transceiving unit 901 may be configured to receive data 3 from a second terminal device, and the processing unit 902 may be configured to process the data 3, where specific processing procedures may refer to processing functions performed by the wireless network device in any of the embodiments described above. The processing unit 902 processes the data 3 to obtain the data packet 2 included in the data 3, and sends the data packet 2 included in the data 2 to the first terminal device through the transceiving unit 901.

Based on the same concept, as shown in fig. 10, a communication device 1000 is provided for the present application. Exemplarily, the communication device 1000 may be a chip or a chip system. Optionally, the chip system in the embodiment of the present application may be composed of a chip, and may also include a chip and other discrete devices. The communication device 1000 may include at least one processor 1010 and the device 1000 may also include at least one memory 1020 for storing program instructions and/or data. The memory 1020 is coupled to the processor 1010. The coupling in the embodiments of the present application is an indirect coupling or a communication connection between devices, units or modules, and may be an electrical, mechanical or other form for information interaction between the devices, units or modules. The processor 1010 may operate in conjunction with the memory 1020. Processor 1010 may execute program instructions stored in memory 1020. Optionally, at least one of the at least one memory 1020 may be included in the processor 1010.

The communication device 1000 may also include a communication interface 1030, and the communication device 1000 may interact with other devices through the communication interface 1030. Communication interface 1030 may be a circuit, bus, transceiver, or any other device that may be used to communicate information.

In a possible implementation manner, the communication apparatus 1000 may be applied to a first terminal device, and specifically, the communication apparatus 1000 may be the first terminal device, and may also be an apparatus capable of supporting the first terminal device and implementing the function of the first terminal device in any of the above-mentioned embodiments. The memory 1020 holds the necessary computer program instructions and/or data to implement the functionality of the first terminal device in any of the embodiments described above. The processor 1010 may execute the computer program instructions stored in the memory 1020 to perform the method performed by the first terminal device in any of the above embodiments.

In a possible implementation manner, the communication apparatus 1000 may be applied to a second terminal device, and specifically, the communication apparatus 1000 may be the second terminal device, and may also be a device capable of supporting the second terminal device to implement the function of the second terminal device in any of the embodiments described above. The memory 1020 holds the necessary computer program instructions and/or data to implement the functionality of the second terminal device in any of the embodiments described above. The processor 1010 may execute the computer program instructions stored in the memory 1020 to perform the method performed by the second terminal device in any of the above embodiments.

In a possible implementation manner, the communication apparatus 1000 may be applied to a wireless network device, and specifically, the communication apparatus 1000 may be a wireless network device, and may also be an apparatus capable of supporting the wireless network device to implement the functions of the wireless network device in any of the embodiments described above. Memory 1020 holds the necessary computer program instructions and/or data to implement the functionality of the wireless network device in any of the embodiments described above. The processor 1010 may execute the computer program instructions stored in the memory 1020 to perform the method performed by the wireless network device in any of the above embodiments.

The specific connection medium among the communication interface 1030, the processor 1010 and the memory 1020 is not limited in the embodiments of the present application. In the embodiment of the present application, the memory 1020, the processor 1010 and the communication interface 1030 are connected by a bus in fig. 10, the bus is represented by a thick line in fig. 10, and the connection manner between other components is merely illustrative and is not limited thereto. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 10, but this is not intended to represent only one bus or type of bus.

In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.

In the embodiment of the present application, the memory may be a nonvolatile memory, such as a Hard Disk Drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory, for example, a random-access memory (RAM). The memory can also be, but is not limited to, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory in the embodiments of the present application may also be circuitry or any other device capable of performing a storage function for storing program instructions and/or data.

According to the foregoing method, as shown in fig. 11, an embodiment of the present invention further provides a structural diagram of a wireless network device, such as a base station 1100.

The base station 1100 may be used in the context of a communication system as shown in fig. 1. The base station 1100 includes one or more radio frequency units, such as a Remote Radio Unit (RRU) 1101 and one or more baseband units (BBUs) (also referred to as digital units, DUs) 1102. The RRU1101 may be referred to as a transceiver unit, transceiver, transceiving circuitry, or transceiver, etc., which may include at least one antenna 11011 and a radio unit 11012. The RRU1101 portion may be used for transceiving radio frequency signals and converting the radio frequency signals to baseband signals, for example, for sending signaling indication and/or reference signals described in the above embodiments to a terminal device. The BBU1102 portion can be used for baseband processing, base station control, and the like. The RRU1101 and the BBU1102 may be physically disposed together or may be physically disposed separately, i.e., a distributed base station.

The BBU1102 is a control center of the base station, which may also be referred to as a processing unit, and may be used to perform baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and so on. For example, the BBU (processing unit) can be used to control a base station to perform the method performed by the wireless network device in any of the embodiments described above.

In an example, the BBU1102 may be formed by one or more boards, where the boards may collectively support a radio access network (e.g., an LTE network) of a single access system, and may also respectively support radio access networks of different access systems. The BBU1102 also includes a memory 11021 and a processor 11022. The memory 11021 stores necessary instructions and data. For example, the memory 11021 stores the correspondence relationship between the information of the propagation delay difference and the propagation delay difference in the above-described embodiment. The processor 11022 is used for controlling the base station to perform necessary actions. The memory 11021 and the processor 11022 may serve one or more boards. That is, the memory and processor may be provided separately on each board. Multiple boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits.

Fig. 12 provides a schematic structural diagram of a terminal device, and fig. 12 exemplifies a communication apparatus in a vehicle. For convenience of explanation, fig. 12 shows only main components of the terminal device. The terminal device 1200 may be applied to the first terminal device or the second terminal device according to any of the above embodiments of the present application. As shown in fig. 12, the terminal device 1200 may include a processor, a memory, a control circuit, and optionally an antenna and/or an input/output device. The processor can be used for processing communication protocols and communication data, controlling the terminal equipment, executing software programs and processing data of the software programs. The memory may be used to store software programs and/or data. The control circuit can be used for conversion of the baseband signal and the radio frequency signal and processing of the radio frequency signal. The control circuit and the antenna together, which may also be called a transceiver, may be used for transceiving radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., can be used to receive data from and output data to a user.

In the embodiment of the present application, the processor may read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor outputs a baseband signal to the radio frequency circuit after performing baseband processing on the data to be sent, and the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data.

Those skilled in the art will appreciate that fig. 12 shows only one memory and processor for ease of illustration. In an actual terminal device, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, and the like, which is not limited in this respect in the embodiment of the present invention.

As an alternative implementation manner, the processor may include a baseband processor and a central processing unit, the baseband processor may be configured to process the communication protocol and the communication data, and the central processing unit may be configured to control the entire terminal device, execute the software program, and process the data of the software program. The processor in fig. 12 integrates the functions of the baseband processor and the central processing unit, and those skilled in the art will understand that the baseband processor and the central processing unit may also be independent processors, and are interconnected through a bus or the like. Those skilled in the art will appreciate that the terminal device may include a plurality of baseband processors to accommodate different network formats, the terminal device may include a plurality of central processors to enhance its processing capability, and various components of the terminal device may be connected by various buses. The baseband processor may also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit may also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data may be built in the processor, or may be stored in the storage unit in the form of a software program, and the processor executes the software program to realize the baseband processing function.

For example, in the embodiment of the present invention, the antenna and the control circuit having the transceiving function may be regarded as the transceiving unit 1201 of the terminal apparatus 1200, and the processor having the processing function may be regarded as the processing unit 1202 of the terminal apparatus 1200. As shown in fig. 12, the terminal apparatus 1200 may include a transceiving unit 1201 and a processing unit 1202. A transceiver unit may also be referred to as a transceiver, a transceiving device, etc. Optionally, a device for implementing a receiving function in the transceiving unit 1201 may be regarded as a receiving unit, and a device for implementing a transmitting function in the transceiving unit 1201 may be regarded as a transmitting unit, that is, the transceiving unit 1201 includes a receiving unit and a transmitting unit, the receiving unit may also be referred to as a receiver, a receiving circuit, or the like, and the transmitting unit may be referred to as a transmitter, a transmitting circuit, or the like.

According to the method provided by the embodiment of the present application, an embodiment of the present invention further provides a communication system, which includes one or more of the foregoing first terminal device, second terminal device, and wireless network device.

Based on the above embodiments, the present application further provides a computer storage medium, in which a software program is stored, and the software program can implement the method provided by any one or more of the above embodiments when being read and executed by one or more processors. The computer storage medium may include: u disk, removable hard disk, read only memory, random access memory, magnetic or optical disk, etc. for storing program codes.

Based on the above embodiments, the present application further provides a chip, where the chip includes a processor, and is configured to implement the functions related to any one or more of the above embodiments, such as obtaining or processing information or messages related to the above methods. Optionally, the chip also includes a memory for the processor to execute the necessary program instructions and data. The chip may be constituted by a chip, or may include a chip and other discrete devices.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. 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 application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A method of communication, comprising:

the method comprises the steps that first terminal equipment receives first data from second terminal equipment through a first channel, wherein the first data comprise a first data packet and first indication information;

the first channel is carried on a first wireless interface, and the first wireless interface is a wireless communication interface for direct communication between the first terminal device and the second terminal device;

the first terminal equipment receives second data multicast by the wireless network equipment through a second channel, wherein the second data comprises a second data packet and second indication information, and the second data packet is from the second terminal equipment; the second channel is carried on a second wireless interface, and the second wireless interface is a wireless communication interface for the first terminal device to communicate with the wireless network device;

the first indication information and the second indication information respectively have a mapping relation with third indication information, and the third indication information is used for indicating multicast service;

and the first terminal equipment performs data aggregation processing on the first data packet and the second data packet at an aggregation protocol layer entity based on the mapping relation.

2. The method of claim 1, further comprising:

the first terminal device receives a first message sent by the wireless network device, where the first message includes the first indication information, the second indication information, and the third indication information, where a mapping relationship exists between the first indication information and the third indication information, and a mapping relationship exists between the third indication information and the second indication information.

3. The method of claim 1, further comprising:

the first terminal equipment receives a second message sent by the V2X controller and receives a third message sent by the wireless network equipment;

the second message comprises the first indication information and the third indication information, wherein a mapping relation exists between the first indication information and the third indication information, and the third message comprises the third indication information and the second indication information, wherein the mapping relation exists between the third indication information and the second indication information;

or, the second message includes the first indication information and a vehicle networking V2X service identifier, wherein the first indication information and the vehicle networking V2X service identifier are mapped, the third message includes the second indication information, the third indication information and the V2X service identifier, wherein the third indication information and the second indication information have a mapping relationship, and the V2X service identifier and the third indication information have a mapping relationship.

4. The method according to claim 2 or 3, wherein the first indication information includes a destination identifier corresponding to the first channel, or wherein the second indication information includes a logical channel identifier or a group radio temporary network identifier of the second channel, or wherein the third indication information includes a multicast service identifier.

5. A method according to any one of claims 1 to 3, wherein the first terminal device determines that the second data packet is from the second terminal device by:

if the second data further comprises fourth indication information, determining that the second data packet is from the second terminal device;

the fourth indication information is an identifier of the second terminal device in the first channel, or the fourth indication information is an identifier having a mapping relationship with the identifier of the second terminal device in the first channel.

6. A method of communication, comprising:

the method comprises the steps that wireless network equipment receives first data from second terminal equipment, wherein the first data comprise a data packet and first indication information, and the first indication information is used for indicating multicast service to which the data packet belongs;

the wireless network equipment multicasts second data on a multicast data channel determined according to the first indication information, wherein the second data comprise the data packet and second indication information, and the second indication information is used for indicating the multicast service to which the data packet belongs;

when the first indication information includes a multicast service identifier to which the data packet belongs, the wireless network device multicasts the second data on a multicast data channel determined according to the first indication information, including: the wireless network equipment multicasts the second data on a multicast data channel corresponding to the multicast service identifier;

alternatively, the first and second electrodes may be,

7. The method of claim 6, further comprising:

and when the first indication information comprises a multicast service identifier, the wireless network equipment broadcasts the mapping relation between the destination identifier and the multicast service identifier.

8. The method of claim 6 or 7, further comprising:

and the wireless network device receives the mapping relation between the destination identifier and the multicast service identifier from a vehicle networking V2X controller or an operation maintenance management device.

9. The method of claim 6 or 7, wherein the wireless network device receives the first data from the second terminal device, comprising:

the wireless network device receiving the first data from a second terminal device through a third channel;

the third channel is carried on a second wireless interface, and the second wireless interface is a communication interface for communication between the wireless network device and the second terminal device.

10. The method according to claim 6 or 7, wherein the second indication information comprises a logical channel identity or a group radio temporary network identity.

11. The method of claim 6 or 7, further comprising:

before receiving first data from a second terminal device, the wireless network device receives an identifier of the second terminal device in a first channel, which is sent by the second terminal device, wherein the first channel is carried on a first wireless interface, and the first wireless interface is a communication interface for communication between the second terminal device and the first terminal device;

the second data multicast by the wireless network device further includes third indication information, where the third indication information is used to indicate that the data packet received by the first terminal device on the multicast data channel is from the second terminal device;

the third indication information is an identifier of the second terminal device in the first channel, or the third indication information is an identifier of a mapping relationship with the identifier of the second terminal device in the first channel.

12. The method of claim 11, further comprising:

and when the third indication information is an identifier having a mapping relationship with the identifier of the second terminal device in the first channel, the wireless network device sends the mapping relationship between the identifier of the second terminal device in the first channel and the third indication information to the first terminal device.

13. A method of communication, comprising:

the wireless network equipment receives first data sent by second terminal equipment through a wireless bearer, wherein the first data comprises a data packet;

the wireless network equipment determines the multicast service identifier to which the data packet belongs according to the wireless bearer;

and the wireless network equipment multicasts second data on a multicast data channel corresponding to the multicast service identifier, wherein the second data comprises the data packet and first indication information, and the first indication information is used for indicating the multicast service to which the data packet belongs.

14. The method of claim 13, wherein before the wireless network device receives the first data sent by the second terminal device through the radio bearer, further comprising:

15. The method of claim 14, further comprising:

before the wireless network device sends the first message to the second terminal device, the wireless network device receives a second message sent by the second terminal device, where the second message is used to notify the second terminal device that a data packet belonging to the service identified by the multicast service identifier exists to be sent.

16. The method of any of claims 13-15, wherein the first indication information comprises a logical channel identity or a group radio temporary network identity.

17. The method of any one of claims 13-15, further comprising:

the second data multicast by the wireless network device further includes second indication information, where the second indication information is used to indicate that the data packet received by the first terminal device on the multicast data channel is from the second terminal device;

the second indication information is an identifier of the second terminal device in the first channel, or the second indication information is an identifier of a mapping relationship with the identifier of the second terminal device in the first channel.

18. The method of claim 17, further comprising:

and when the second indication information is an identifier having a mapping relationship with the identifier of the second terminal device in the first channel, the wireless network device sends the mapping relationship between the identifier of the second terminal device in the first channel and the second indication information to the first terminal device.

19. A communications apparatus, comprising: a processor and a memory;

the memory is used for storing computer execution instructions;

the processor is configured to execute computer-executable instructions stored by the memory to cause the communication device to implement the functionality of the first terminal device in the method according to any one of claims 1 to 5.

20. A communications apparatus, comprising: a processor and a memory;

the memory is used for storing computer execution instructions;

the processor is configured to execute computer-executable instructions stored by the memory to cause the communication device to implement the functions of the wireless network apparatus in the method of any one of claims 6 to 18.

21. A computer-readable storage medium, characterized in that it stores computer-readable instructions which, when executed by a computer, implement the functionality of the first terminal device in the method of any one of claims 1 to 5 or the functionality of the wireless network device in the method of any one of claims 6 to 18.