CN113498113A

CN113498113A - Data transmission method, equipment and system for proximity service

Info

Publication number: CN113498113A
Application number: CN202010260428.5A
Authority: CN
Inventors: 邢玮俊; 吴问付
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-04-03
Filing date: 2020-04-03
Publication date: 2021-10-12
Anticipated expiration: 2040-04-03
Also published as: CN113498113B; WO2021197269A1; CN116709424A

Abstract

The application discloses a data transmission method, equipment and a system of proximity service, relates to the technical field of wireless communication, and can solve the problem that service data transmission cannot be completed due to mismatching of quality of service (QoS) parameters of a PC5 interface and QoS parameters of a Uu interface during data transmission. In the solution provided in the present application, a relay User Equipment (UE) may transmit service data of a first service between a remote UE and a relay UE through a second communication link according to a correspondence relationship between a first communication link (e.g., DRB) and a second communication link (e.g., SLRB) by obtaining the correspondence relationship between the relay UE and an access network device through the first communication link.

Description

Data transmission method, equipment and system for proximity service

Technical Field

The embodiment of the application relates to the technical field of wireless communication, in particular to a method, equipment and system for transmitting proximity-based services (ProSe) data.

Background

With the wide use of intelligent terminals, in order to improve spectrum utilization, system throughput, increase network coverage, and the like, ProSe communication is increasingly widely used. In ProSe communication, a communication link can be directly established between a terminal and a terminal, and communication is directly performed through the communication link without forwarding communication by an access network device.

As shown in fig. 1, in a ProSe architecture of a fifth Generation mobile communication technology (5th-Generation, 5G) communication system, if terminal 1 and terminal 2 establish a ProSe communication link of a PC5 interface, terminal 1 may establish a connection with a Radio Access Network (RAN) and a core network through a Uu interface between terminal 2 and the RAN and communicate with the RAN. In the above scenario, terminal 1 may be referred to as a remote user equipment (remote UE), and terminal 2 may be referred to as a relay user equipment (UE-to-network relay UE).

The ProSe communication needs to be implemented by an air interface protocol stack. The air interface protocol stack is typically divided into three layers: a physical Layer (also known as Layer-1, L1 Layer), a data link Layer (also known as Layer-2, L2 Layer), and a network Layer (also known as Layer-3, L3 Layer). As shown in fig. 2, in the New Radio (NR) communication system of 5G, the L2 layer (i.e. the data link layer) can be further divided into the following sub-layers: a Medium Access Control (MAC) layer, a Radio Link Control (RLC) layer, a Packet Data Convergence Protocol (PDCP) layer, and a Service Data Adaptation Protocol (SDAP) layer. The MAC layer is configured to provide a logical channel to the RLC layer and perform mapping between the logical channel and a physical channel. The RLC layer serves to provide the PDCP layer with an RLC channel and perform mapping of the RLC channel with a logical channel. The PDCP layer is configured to provide a Radio Bearer (RB) to the SDAP layer and perform mapping of the RB and RLC channels. The RB includes a Signaling Radio Bearer (SRB) of a control plane and a data radio bearer (DBR) of a user plane. The SDAP layer is used for providing specific quality of service (QoS) flow of the data packet and mapping the QoS flow and the RB. Packets transmitted by the same QoS flow are processed using the same QoS parameters and are represented by a QoS Flow Identifier (QFI). The QoS parameter is used to indicate one or more of the parameters such as resource type, priority, time delay, packet loss rate or time window size required for data packet transmission.

In the conventional NR ProSe communication, as shown in fig. 3, when an application server has a packet to be transmitted, first, a packet in a Protocol Data Unit (PDU) is encapsulated at an NR-SDAP layer of a remote UE once. The NR-SDAP layer will then map the packet to a bearer for physical layer transmission based on the QoS requirements of the packet. Since the protocol between the NR-SDAP and the NR-PDCP is a communication protocol used by the Uu interface, as specified in TS 38.300, the NR-SDAP will correspond the packet to the corresponding Uu QoS parameter according to the packet QoS requirement, and issue the packet to the lower layer through the Uu interface. As such, the remote UE may send the data packet to the relay UE over the PC5 link using the Uu QoS parameters.

However, the requirement for the QoS parameter of PC5 is different from that of Uu QoS parameter for the same packet, and therefore, the transmission of the packet cannot be completed by the above conventional data transmission method.

Disclosure of Invention

The application provides a data transmission method, equipment and system of proximity service, which can solve the problem that service data transmission cannot be completed due to the fact that QoS parameters of a PC5 interface are not matched with QoS parameters of a Uu interface.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

in a first aspect, a method for transmitting data of an adjacent service is provided, where the method is applied to a relay UE, and the method includes: the relay UE acquires the corresponding relation between the first communication link and the second communication link; the first communication link is used for transmitting data of a first service between the relay UE and the access network equipment; the second communication link is used for transmitting data of the first service between the relay UE and the remote UE; and the relay UE transmits the data of the first service of the remote UE according to the acquired corresponding relation.

In the technical solution provided in the first aspect, the relay UE may transmit the service data of the first service between the remote UE and the relay UE through the second communication link according to the correspondence relationship by obtaining the correspondence relationship between the first communication link (e.g., DRB) and the second communication link (e.g., SLRB). Through the scheme, the problem that service data transmission cannot be completed due to the fact that QoS parameters of the first communication link (such as DRB) and the second communication link (such as SLRB) are not matched in the conventional technology can be solved.

In a possible implementation manner, the acquiring, by the relay UE, a correspondence between the first communication link and the second communication link includes: the relay UE receives the identification information of the first communication link and the identification information of the second communication link from the access network equipment; and the relay UE establishes the corresponding relation between the first communication link and the second communication link according to the received identification information of the first communication link and the identification information of the second communication link. The scheme supports that the access network equipment determines the first communication link and the second communication link, and the relay UE establishes the corresponding relation between the first communication link and the second communication link according to the first communication link and the second communication link determined by the access network equipment.

In a possible implementation manner, the acquiring, by the relay UE, a correspondence between the first communication link and the second communication link includes: and the relay UE receives the corresponding relation from the access network equipment. The scheme supports that the access network equipment determines the first communication link and the second communication link, and establishes the corresponding relation between the first communication link and the second communication link according to the determined first communication link and the determined second communication link.

In a possible implementation manner, the acquiring, by the relay UE, a correspondence between the first communication link and the second communication link includes: the relay UE receives the first corresponding relation from the access network equipment; the first correspondence is between the first communication link and at least two PC5 interface communication links of the remote UE; the relay UE determines a second communication link from the at least two PC5 interface communication links; the relay UE establishes a correspondence between the first communication link and the second communication link. The scheme supports that the access network equipment determines a first communication link and at least two candidate PC5 interface communication links of the remote UE corresponding to the first communication link, and the relay UE further determines a second communication link from the at least two candidate PC5 interface communication links finally, so that the corresponding relation between the first communication link and the second communication link is established.

In a possible implementation manner, the method further includes: the relay UE receives a PC5 service quality QoS parameter of a first service from the access network equipment; the relay UE receives the second corresponding relation from the access network equipment; the second corresponding relation is the corresponding relation between the at least two PC5 interface communication links and the PC5QoS parameters; the relay UE determines a second communication link from the at least two PC5 interface communication links, and the method comprises the following steps: and the relay UE determines a second communication link from the at least two PC5 interface communication links according to the PC5QoS parameter of the first service, the first corresponding relation and the second corresponding relation. The scheme supports the determination of a first communication link and at least two candidate PC5 interface communication links of a remote UE corresponding to the first communication link by the access network equipment, and further determines a final second communication link from at least two candidate PC5 interface communication links by the relay UE according to the PC5QoS parameter of the first service, the corresponding relation between the first communication link and at least two PC5 interface communication links of the remote UE and the corresponding relation between the at least two PC5 interface communication links and the PC5QoS parameter, so as to establish the corresponding relation between the first communication link and the second communication link.

In a possible implementation manner, the PC5QoS parameter of the first service includes one or more of the following parameters: the resource type of the PC5 interface, the scheduling priority of the PC5 interface, the time delay of the PC5 interface, the packet loss rate of the PC5 interface, the maximum burst flow of the PC5 interface or the time window size of the PC5 interface; the resource types of the PC5 interface include one or more of the following: a guaranteed bit rate GBR type, a Non-guaranteed bit rate Non-GBR type, and a Delay-critical guaranteed bit rate Delay-critical GBR type. The requirements of the service on the interface parameters in the present application include, but are not limited to, at least one of resource type, scheduling priority, delay, packet loss rate, maximum burst traffic, or time window size.

In a possible implementation manner, the method further includes: the relay UE receives the PC5QoS parameter of the first service; the above-mentioned relay UE obtaining the correspondence between the first communication link and the second communication link includes: the relay UE receives the identification information of the first communication link from the access network equipment; the relay UE determines a second communication link according to the PC5QoS parameter of the first service; and the relay UE establishes a corresponding relation between the first communication link and the second communication link. The scheme supports that the access network equipment determines a first communication link, and the relay UE determines a second communication link according to the PC5QoS parameter of the first service, so that the corresponding relation between the first communication link and the second communication link is established.

In a possible implementation manner, the acquiring, by the relay UE, a correspondence between the first communication link and the second communication link includes: the relay UE receives configuration information of a second communication link from the remote UE; the relay UE receives identification information of a first communication link from an access network device; and the relay UE establishes the corresponding relation between the first communication link and the second communication link according to the configuration information of the second communication link and the identification information of the first communication link. The scheme supports that the access network equipment determines a first communication link, the remote UE determines a second communication link, and finally the relay UE establishes a corresponding relation between the first communication link and the second communication link.

In a possible implementation manner, the first communication link is a data radio bearer DRB, and the second communication link is a sidelink radio bearer SLRB.

In a second aspect, a method for transmitting data of an adjacent service is provided, where the method is applied to an access network device, and the method includes: the access network equipment receives Uu QoS requirement information of a first service; the access network equipment determines to transmit the data of the first service through a first communication link between the access network equipment and the relay UE according to the Uu QoS requirement information of the first service; the access network equipment determines a second communication link according to the corresponding relation between the first Uu QoS parameter and the first PC5QoS parameter and the Uu QoS requirement information of the first service; the second communication link is used for transmitting data of the first service between the relay UE and the remote UE; the access network equipment sends communication link information to the relay user equipment UE, wherein the communication link information is used for representing or establishing a corresponding relation between a first communication link and a second communication link; the first Uu QoS parameter is used for transmitting data of the first service through a Uu interface between the relay UE and the access network device, and the first PC5QoS parameter is used for transmitting data of the first service through a PC5 interface between the relay UE and the remote UE.

In the technical solution provided in the second aspect, the access network device determines, according to the Uu QoS requirement information of the first service, a first communication link for transmitting data of the first service between the access network device and the relay UE, and determines, according to the corresponding relationship between the Uu QoS parameter of the first service and the PC5QoS parameter, a second communication link for transmitting data of the first service between the remote UE and the relay UE, in combination with the Uu QoS requirement information of the first service. By the scheme, the problem that service data transmission cannot be completed due to mismatching of the first communication link (such as DRB) and the second communication link (such as SLRB) in the conventional technology can be solved.

In a possible implementation manner, the communication link information includes a correspondence between the first communication link and the second communication link; alternatively, the communication link information includes identification information of the first communication link and identification information of the second communication link. The scheme supports that the access network equipment determines the first communication link and the second communication link, and the relay UE establishes the corresponding relation between the first communication link and the second communication link according to the first communication link and the second communication link determined by the access network equipment. Or, the access network device determines the first communication link and the second communication link, and establishes a corresponding relationship between the first communication link and the second communication link according to the determined first communication link and the determined second communication link.

In a possible implementation manner, the method further includes: the access network equipment receives Uu QoS requirement information of a second service; the access network equipment determines to transmit the data of the second service through the first communication link according to the Uu QoS requirement information of the second service; the access network equipment determines a third communication link according to the corresponding relation between the second Uu QoS parameter and the second PC5QoS parameter and the Uu QoS requirement information of the second service; the third communication link is used for transmitting data of a second service between the relay UE and the remote UE; wherein the communication link information comprises a first communication link and a corresponding relationship between at least two PC5 interface communication links of the remote UE, and the at least two PC5 interface communication links comprise a second communication link and a third communication link; the second Uu QoS parameter is used for transmitting data of the second service through a Uu interface between the relay UE and the access network device, and the second PC5QoS parameter is used for transmitting data of the second service through a PC5 interface between the relay UE and the remote UE. The scheme supports that the access network equipment determines a first communication link and two candidate PC5 interface communication links corresponding to different services of the remote UE corresponding to the first communication link, and the relay UE further determines a second communication link finally from the two candidate PC5 interface communication links, so that the corresponding relation between the first communication link and the second communication link is established.

In a possible implementation manner, the method further includes: the access network equipment receives Uu QoS requirement information of a third service; the access network equipment determines to transmit the data of the third service through the first communication link according to the Uu QoS requirement information of the third service; the access network equipment determines a fourth communication link for transmitting the data of the third service between the relay UE and the remote UE according to the corresponding relation between the third Uu QoS parameter and the third PC5QoS parameter and the Uu QoS requirement information of the third service; the at least two PC5 interface communication links further comprise a fourth communication link; the third Uu QoS parameter is used for transmitting data of the third service through the Uu interface between the relay UE and the access network device, and the third PC5QoS parameter is used for transmitting data of the third service through the PC5 interface between the relay UE and the remote UE. The scheme supports that the access network equipment determines a first communication link and at least two candidate PC5 interface communication links corresponding to different services of the remote UE corresponding to the first communication link, and the relay UE further determines a second communication link finally from the at least two candidate PC5 interface communication links, so that the corresponding relation between the first communication link and the second communication link is established.

In a possible implementation manner, the method further includes: the access network equipment receives Uu QoS requirement information of a fourth service of the second remote UE; the access network equipment determines to transmit the data of the fourth service through the first communication link according to the Uu QoS requirement information of the fourth service; the access network equipment determines a fifth communication link for transmitting the data of the fourth service between the relay UE and the second remote UE according to the corresponding relation between the fourth Uu QoS parameter and the fourth PC5QoS parameter and the Uu QoS requirement information of the fourth service; the access network equipment sends the corresponding relation between the first communication link and a fifth communication link of the second remote UE to the relay UE; the fourth Uu QoS parameter is used for transmitting data of a fourth service through a Uu interface between the relay UE and the access network equipment, and the fourth PC5QoS parameter is used for transmitting data of the fourth service through a PC5 interface between the relay UE and a second remote UE; the communication link information also includes identification information of the first remote UE and identification information of the second remote UE. The scheme supports that the access network equipment determines a first communication link and two PC5 interface communication links corresponding to different services of different remote UEs corresponding to the first communication link, and the relay UE further finally determines a second communication link from the two PC5 interface communication links, so that the corresponding relation between the first communication link and the second communication link is established.

In a possible implementation manner, the Uu QoS requirement information of the first service includes one or more of the following: the method comprises the following steps that the resource type of a Uu interface, the scheduling priority of the Uu interface, the time delay of the Uu interface, the packet loss rate of the Uu interface, the maximum burst flow of the Uu interface or the time window size of the Uu interface are determined; wherein, the resource type of the Uu interface comprises one or more of the following: a guaranteed bit rate GBR type, a Non-guaranteed bit rate Non-GBR type, and a Delay-critical guaranteed bit rate Delay-critical GBR type. The requirements of the service on the interface parameters in the present application include, but are not limited to, at least one of resource type, scheduling priority, delay, packet loss rate, maximum burst traffic, or time window size.

In a possible implementation manner, the access network device receives Uu QoS requirement information of the first service from the session management function SMF network element through a protocol data unit PDU session.

In a possible implementation manner, the method further includes: the access network equipment receives the corresponding relation between the first Uu QoS parameter and the first PC5QoS parameter from the PCF network element. The scheme supports the management of the corresponding relation between the first Uu QoS parameter and the first PC5QoS parameter by the PCF network element.

In a third aspect, a relay UE is provided, which includes: the receiving and sending unit is used for acquiring the corresponding relation between the first communication link and the second communication link; the first communication link is used for transmitting data of a first service between the relay UE and the access network equipment; the second communication link is used for transmitting data of the first service between the relay UE and the remote UE; and the processing unit is used for transmitting the data of the first service of the remote UE according to the acquired corresponding relation.

In the technical solution provided in the third aspect, the relay UE may respectively transmit the service data of the first service between the relay UE and the access network device, and between the remote UE and the relay UE, by acquiring the corresponding relationship between the first communication link (e.g., DRB) and the second communication link (e.g., SLRB). By the scheme, the problem that service data transmission cannot be completed due to mismatching of the first communication link (such as DRB) and the second communication link (such as SLRB) in the conventional technology can be solved.

In a possible implementation manner, the transceiver unit is further configured to receive, from the access network device, identification information of the first communication link and identification information of the second communication link; the processing unit acquiring a corresponding relationship between the first communication link and the second communication link includes: the processing unit establishes a corresponding relationship between the first communication link and the second communication link according to the identification information of the first communication link and the identification information of the second communication link received by the transceiving unit. The scheme supports that the access network equipment determines the first communication link and the second communication link, and the relay UE establishes the corresponding relation between the first communication link and the second communication link according to the first communication link and the second communication link determined by the access network equipment.

In a possible implementation manner, the acquiring, by the processing unit, a correspondence between the first communication link and the second communication link includes: the processing unit receives the corresponding relation from the access network equipment through the transceiving unit. The scheme supports that the access network equipment determines the first communication link and the second communication link, and establishes the corresponding relation between the first communication link and the second communication link according to the determined first communication link and the determined second communication link.

In a possible implementation manner, the transceiver unit is further configured to receive the first corresponding relationship from the access network device; the first correspondence is between the first communication link and at least two PC5 interface communication links of the remote UE; the processing unit acquiring a corresponding relationship between the first communication link and the second communication link includes: the processing unit determines a second communication link from the at least two PC5 interface communication links; and the processing unit establishes a correspondence between the first communication link and the second communication link. The scheme supports that the access network equipment determines a first communication link and at least two candidate PC5 interface communication links of the remote UE corresponding to the first communication link, and the relay UE further determines a second communication link from the at least two candidate PC5 interface communication links finally, so that the corresponding relation between the first communication link and the second communication link is established.

In a possible implementation manner, the transceiving unit is further configured to receive, from the access network device, a quality of service QoS parameter of the PC5 of the first service; receiving a second correspondence from the access network device; the second corresponding relation is the corresponding relation between the at least two PC5 interface communication links and the PC5QoS parameters; the processing unit determines a second communication link from the at least two PC5 interface communication links, including: the processing unit determines a second communication link from the at least two PC5 interface communication links according to the PC5QoS parameter of the first service, the first corresponding relation and the second corresponding relation. The scheme supports the determination of a first communication link and at least two candidate PC5 interface communication links of a remote UE corresponding to the first communication link by the access network equipment, and further determines a final second communication link from at least two candidate PC5 interface communication links by the relay UE according to the PC5QoS parameter of the first service, the corresponding relation between the first communication link and at least two PC5 interface communication links of the remote UE and the corresponding relation between the at least two PC5 interface communication links and the PC5QoS parameter, so as to establish the corresponding relation between the first communication link and the second communication link.

In a possible implementation manner, the transceiver unit is further configured to receive a PC5QoS parameter of the first service; and receiving identification information of the first communication link from an access network device; the processing unit acquiring a corresponding relationship between the first communication link and the second communication link includes: the processing unit determines a second communication link according to the PC5QoS parameter of the first service; and the processing unit establishes a corresponding relationship between the first communication link and the second communication link. The scheme supports that the access network equipment determines a first communication link, and the relay UE determines a second communication link according to the PC5QoS parameter of the first service, so that the corresponding relation between the first communication link and the second communication link is established.

In a possible implementation manner, the transceiver unit is further configured to receive configuration information of a second communication link from a remote UE; receiving identification information of a first communication link from an access network device; the processing unit acquiring a corresponding relationship between the first communication link and the second communication link includes: and the processing unit establishes the corresponding relation between the first communication link and the second communication link according to the configuration information of the second communication link and the identification information of the first communication link. The scheme supports that the access network equipment determines a first communication link, the remote UE determines a second communication link, and finally the relay UE establishes a corresponding relation between the first communication link and the second communication link.

In a fourth aspect, an access network device is provided, which includes: a receiving and sending unit, configured to receive Uu QoS requirement information of a first service; a processing unit, configured to determine, according to Uu QoS requirement information of a first service, that data of the first service is transmitted through a first communication link between an access network device and a relay UE; determining a second communication link according to the corresponding relation between the first Uu QoS parameter and the first PC5QoS parameter and the Uu QoS requirement information of the first service; the second communication link is used for transmitting data of the first service between the relay UE and the remote UE; the receiving and sending unit is further configured to send communication link information to the relay user equipment UE, where the communication link information is used to represent or establish a correspondence between the first communication link and the second communication link; the first Uu QoS parameter is used for transmitting data of the first service through a Uu interface between the relay UE and the access network device, and the first PC5QoS parameter is used for transmitting data of the first service through a PC5 interface between the relay UE and the remote UE.

In the technical solution provided in the fourth aspect, the access network device determines, according to the Uu QoS requirement information of the first service, a first communication link for transmitting data of the first service between the access network device and the relay UE, and determines, according to the corresponding relationship between the Uu QoS parameter of the first service and the PC5QoS parameter, a second communication link for transmitting data of the first service between the remote UE and the relay UE, in combination with the Uu QoS requirement information of the first service. By the scheme, the problem that service data transmission cannot be completed due to mismatching of the first communication link (such as DRB) and the second communication link (such as SLRB) in the conventional technology can be solved.

In a possible implementation manner, the transceiver unit is further configured to receive Uu QoS requirement information of a second service; the processing unit is further configured to determine, according to the Uu QoS requirement information of the second service, to transmit data of the second service through the first communication link; determining a third communication link according to the corresponding relation between the second Uu QoS parameter and the second PC5QoS parameter and the Uu QoS requirement information of the second service; the third communication link is used for transmitting data of a second service between the relay UE and the remote UE; wherein the communication link information comprises a first communication link and a corresponding relationship between at least two PC5 interface communication links of the remote UE, and the at least two PC5 interface communication links comprise a second communication link and a third communication link; the second Uu QoS parameter is used for transmitting data of the second service through a Uu interface between the relay UE and the access network device, and the second PC5QoS parameter is used for transmitting data of the second service through a PC5 interface between the relay UE and the remote UE. The scheme supports that the access network equipment determines a first communication link and two candidate PC5 interface communication links corresponding to different services of the remote UE corresponding to the first communication link, and the relay UE further determines a second communication link finally from the two candidate PC5 interface communication links, so that the corresponding relation between the first communication link and the second communication link is established.

In a possible implementation manner, the transceiver unit is further configured to receive Uu QoS requirement information of a third service; the processing unit is further configured to determine, according to the Uu QoS requirement information of the third service, to transmit data of the third service through the first communication link; determining a fourth communication link for transmitting the data of the third service between the relay UE and the remote UE according to the corresponding relation between the third Uu QoS parameter and the third PC5QoS parameter and the Uu QoS requirement information of the third service; the at least two PC5 interface communication links further comprise a fourth communication link; the third Uu QoS parameter is used for transmitting data of the third service through the Uu interface between the relay UE and the access network device, and the third PC5QoS parameter is used for transmitting data of the third service through the PC5 interface between the relay UE and the remote UE. The scheme supports that the access network equipment determines a first communication link and at least two candidate PC5 interface communication links corresponding to different services of the remote UE corresponding to the first communication link, and the relay UE further determines a second communication link finally from the at least two candidate PC5 interface communication links, so that the corresponding relation between the first communication link and the second communication link is established.

In a possible implementation manner, the transceiver unit is further configured to receive Uu QoS requirement information of a fourth service of the second remote UE; the processing unit is further configured to determine, according to the Uu QoS requirement information of the fourth service, to transmit data of the fourth service through the first communication link; determining a fifth communication link for transmitting the data of the fourth service between the relay UE and the second remote UE according to the corresponding relation between the fourth Uu QoS parameter and the fourth PC5QoS parameter and the Uu QoS requirement information of the fourth service; the access network equipment sends the corresponding relation between the first communication link and a fifth communication link of the second remote UE to the relay UE; the fourth Uu QoS parameter is used for transmitting data of a fourth service through a Uu interface between the relay UE and the access network equipment, and the fourth PC5QoS parameter is used for transmitting data of the fourth service through a PC5 interface between the relay UE and a second remote UE; the communication link information also includes identification information of the first remote UE and identification information of the second remote UE. The scheme supports that the access network equipment determines a first communication link and two PC5 interface communication links corresponding to different services of different remote UEs corresponding to the first communication link, and the relay UE further finally determines a second communication link from the two PC5 interface communication links, so that the corresponding relation between the first communication link and the second communication link is established.

In a possible implementation manner, the transceiver unit is further configured to receive Uu QoS requirement information of the first service from the session management function SMF network element through a protocol data unit PDU session.

In a possible implementation manner, the transceiving unit is further configured to receive a correspondence between a first Uu QoS parameter and a first PC5QoS parameter from the PCF network element. The scheme supports the management of the corresponding relation between the first Uu QoS parameter and the first PC5QoS parameter by the PCF network element.

In a fifth aspect, a relay UE is provided, which includes: a memory for storing a computer program; a processor configured to execute the computer program to implement the method for data transmission of the proximity service in any possible implementation manner of the first aspect.

In a sixth aspect, an access network device is provided, which includes: a memory for storing a computer program; a processor configured to execute the computer program to implement the data transmission method of the proximity service in any possible implementation manner of the second aspect.

A seventh aspect provides a communication system, including the relay UE in any one of the possible implementations of the third aspect or the fifth aspect; and an access network apparatus as in any one of the possible implementations of the fourth aspect or the sixth aspect.

In one possible implementation, the communication system further comprises one or more of: PCF network element, remote UE, SMF network element or AMF network element.

An eighth aspect provides a computer-readable storage medium having computer program code stored thereon, which when executed by a processor implements a method for data transmission of an approaching service as in any one of the possible implementations of the first aspect or the second aspect.

In a ninth aspect, a chip system is provided, which includes a processor and a memory, wherein the memory stores computer program codes; the computer program code, when executed by the processor, implements a method for data transmission of an approaching service as in any one of the possible implementations of the first aspect or the second aspect. The chip system may be formed by a chip, and may also include a chip and other discrete devices.

A tenth aspect provides a computer program product which, when run on a computer, causes a method of data transmission of an approaching service as in any one of the possible implementations of the first or second aspect to be implemented.

Drawings

Fig. 1 is an exemplary diagram of a ProSe architecture of a 5G communication system;

FIG. 2 is a data processing diagram of a data link layer;

FIG. 3 is a diagram of a user plane protocol stack structure of a relay UE data link layer;

FIG. 4 is a diagram of a communication network architecture;

fig. 5 is a schematic hardware structure diagram of a remote UE or a relay UE according to an embodiment of the present disclosure;

fig. 6 is a schematic hardware structure diagram of a network device according to an embodiment of the present disclosure;

fig. 7 is a flowchart of a method for data transmission of an approaching service according to an embodiment of the present disclosure;

fig. 8 is a first interaction diagram of a data transmission method for proximity services according to an embodiment of the present disclosure;

fig. 9 is a second interaction diagram of a data transmission method for proximity services according to an embodiment of the present disclosure;

fig. 10 is a third interaction diagram of a data transmission method for proximity services according to an embodiment of the present application;

fig. 11 is a fourth interaction diagram of a data transmission method for proximity services according to an embodiment of the present disclosure;

fig. 12 is an interaction diagram of a data transmission method of proximity services according to an embodiment of the present application;

fig. 13 is a sixth interaction diagram of a data transmission method for proximity services according to an embodiment of the present disclosure;

fig. 14 is a block diagram of a UE according to an embodiment of the present disclosure;

fig. 15 is a block diagram of a network device according to an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

The embodiment of the present application may be applied to, but is not limited to, the following communication systems: a narrowband internet of things (NB-IoT) system, a Wireless Local Access Network (WLAN) system, a Long Term Evolution (LTE) system, a fifth generation mobile communication (5th generation mobile networks or 5th generation wireless systems, 5G) also called a New Radio (NR) system, or a communication system after 5G, such as a 6G system, a device-to-device (D2D) communication system, an internet of vehicles, and so on.

Fig. 4 shows a communication network architecture diagram. Fig. 4 shows an interaction relationship between a network function and an entity and a corresponding interface, taking a network service architecture of a 5G system as an example, where the network architecture is a service-based architecture (SBA).

As shown in fig. 4, the network functions and entities included in the 5G system mainly include: a UE, AN Access Network (AN) or a Radio Access Network (RAN), a User Plane Function (UPF), a Data Network (DN), AN access and mobility management function (AMF), a Session Management Function (SMF), AN authentication service function (AUSF), a Policy Control Function (PCF), AN Application Function (AF), a Network Slice Selection Function (NSSF), AN authenticated data management (UDM), a network open function (NEF), and a network storage function (NRF).

It should be noted that when the UE connects to the network through the relay device, the UE may be referred to as a "remote UE". The relay device is a device that can provide access to a cellular network for a remote UE, and may be a relay station or a device such as a UE, where the UE necessarily supports PC5 interface communication in the case that the UE acts as a relay device for the remote UE, and may be referred to as a "relay UE" indicating that the relay device is located in a coverage area of a mobile network, for example, the relay device may normally access an access network of a 5G system.

As shown in fig. 4, the remote UE is connected to the access network device and the core network device through the relay UE. The interface between the remote UE and the relay UE is a PC5 interface, the interface between the relay UE and the AN/RAN is a Uu interface, the interface point between the remote UE/the relay UE and the AMF is AN N1 interface, the interface between the AN/RAN and the AMF is AN N2 interface, the interface between the AN/RAN and the UPF is AN N3 interface, the interface between the SMF and the UPF is AN N4 interface, and the UPF is AN N6 interface; namf is a service-based interface displayed by AMF, Nsmf is a service-based interface displayed by SMF, Nausf is a service-based interface displayed by AUSF, Nnssf is a service-based interface displayed by NSSF, Nnef is a service-based interface displayed by NEF, Nnrf is a service-based interface displayed by NRF, Npcf is a service-based interface displayed by PCF, Nudm is a service-based interface displayed by UDM, and Naf is a service-based interface displayed by AF.

The main functions of each network element will be described in detail below.

AN/RAN: the AN/RAN may be constituted by AN/RAN device. The AN/RAN equipment may be various forms of base stations, such as: a macro base station, a micro base station (also referred to as a "small station"), a distributed unit-control unit (DU-CU), and the like, wherein the DU-CU is a device capable of wirelessly communicating with the UE deployed in the radio access network. In addition, the base station may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or a network device in a relay station, an access point, a vehicle-mounted device, a wearable device, or a Public Land Mobile Network (PLMN) network for future evolution, or the like. The AN/RAN device may also be a broadband network service gateway (BNG), a convergence switch, a non-3 GPP access device, or the like. The AN/RAN device is mainly responsible for functions of radio resource management, uplink and downlink data classification, quality of service (QoS) management, data compression and encryption at the air interface side, signaling processing with a control plane network element, data forwarding with a user plane functional network element, and the like. The embodiment of the present application does not limit the specific form and structure of the AN/RAN device.

For example, in systems employing different radio access technologies, the names of base station-capable devices may differ. For example, the base station may be an evolved universal terrestrial radio access network (E-UTRAN) device in LTE, such as an evolved node B (eNB or E-NodeB), or a next generation radio access network (NG-RAN) device in 5G system (e.g., a gNB).

AMF: is mainly responsible for the processing of control plane messages, such as: access control, mobility management, lawful interception, access authentication/authorization, etc. For example, the functions of the AMF include: 1) processing an access network control plane; 2) processing the NAS message, and taking charge of NAS encryption and integrity protection; 3) registration management; 4) connection management; 5) performing accessibility management; 6) mobility management; 7) intercepting legal information; 8) providing session management messages between the UE and the SMF; 9) transparent transmission is realized for the Session Management (SM) message of the route, similar to a transparent transmission agent; 10) access authentication; 11) access authorization; 12) forwarding an SMS message (short message) between the UE and a short message service function, SMSF; 13) interacting with AUSF and UE to obtain UE authentication intermediate key; 14) a specific key for the access network is calculated.

SMF: the method is mainly used for session management, Internet Protocol (IP) address allocation and management of UE, selection of a terminal node of an interface capable of managing a user plane function, a policy control and charging function, downlink data notification and the like. For example, the functions of SMF include: 1) session management, session establishment, modification and release, including maintaining a channel between the UPF and the AN node; 2) UE IP address allocation and management; 3) selecting and controlling user plane functions; 4) configuring a correct service route on the UPF; 5) landing execution of a policy control function; 6) a control part of strategy execution and QoS; 7) legally intercepting; 8) processing a session management part in the NAS message; 9) downlink data indication; 10) initiating access network specific session management information (routed through AMF); 11) determining a mode of continuity with a service in a session; 12) a roaming function.

PCF: the method is mainly used for providing UE policy rules, Access Management (AM) policy rules and SM policy rule related parameters for UE, AMF or SMF, managing user subscription information, interfacing UDM to access subscription user information related to policy decision and the like. The PCF generally makes policy decisions based on subscription information and the like.

AF: for providing services, mainly for: 1) application impact on traffic routing; 2) access network capability exposure; 3) and interacting with a policy framework to perform policy control.

In addition, for the introduction of the functions of UPF, DN, AUSF, NSSF, NEF, NRF, UDM, and the like, reference may be made to explanations and descriptions in the conventional art, which are not repeated herein.

Remote UE/relay UE: the device can be a desktop device, a laptop device, a handheld device, a wearable device, a smart home device, a computing device, a vehicle-mounted device and the like with a wireless connection function. For example, a netbook, a tablet computer, a smart watch, an ultra-mobile personal computer (UMPC), a smart camera, a netbook, a Personal Digital Assistant (PDA), a Portable Multimedia Player (PMP), (amplified Reality, AR)/Virtual Reality (VR) device, a wireless device on an aircraft, a wireless device on a robot, a wireless device in industrial control, a wireless device in telemedicine, a wireless device in a smart grid, a wireless device in a smart city (smart city), a wireless device in a smart home (smart home), and the like. Or the remote UE/relay UE may also be a wireless device in Narrowband (NB) technology, etc.

Further, remote UE/relay UE may also refer to an access terminal, subscriber unit, subscriber station, mobile station, relay station, remote terminal, mobile device, user terminal (user terminal), terminal (terminal), wireless communication device, user agent, or user equipment. The terminal device may also 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 functionality, a computing device or other processing device connected to a wireless modem, a vehicle mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved PLMN or a terminal device in a future vehicle networking, etc.

In addition, the remote UE/relay UE can also be a terminal device in an IoT system, IoT is an important component of future information technology development, and the main technical feature of the method is to connect an article with a network through a communication technology, so as to realize an intelligent network with man-machine interconnection and object-object interconnection. The IOT technology can achieve massive connection, deep coverage and terminal power saving through the NB technology, for example. The specific type and structure of the remote UE/relay UE are not limited in the present application.

Referring to fig. 5, fig. 5 is a schematic diagram illustrating a hardware structure of a UE, which may be a relay UE or a remote UE. As shown in fig. 5, the UE may specifically include: processor 501, radio frequency circuitry 502, memory 503, touch screen 504, bluetooth device 505, one or more sensors 506, Wi-Fi device 507, pointing device 508, audio circuitry 509, peripheral interface 510, power supply 511, fingerprint acquisition device 512, speaker 513, and microphone 514. These components may communicate over one or more communication buses or signal lines (not shown in fig. 5). Those skilled in the art will appreciate that the hardware configuration shown in fig. 5 does not constitute a limitation of relay UEs or remote UEs, which may each include more or fewer components than those shown, or combine certain components, or a different arrangement of components.

The following describes each component of the relay UE in detail with reference to fig. 5:

the processor 501 may be a control center of the relay UE, and may connect other various parts of the relay UE by using various interfaces and lines, and execute various functions of the relay UE by running or executing a computer program stored in the memory 503, for example, an application client program (hereinafter, may be abbreviated as App).

In some embodiments, the processor 501 may be a general purpose CPU, a microprocessor, a special ASIC, or one or more integrated circuits for controlling the execution of the programs of the present application, and the processor 501 may include one or more CPUs; for example, the processor 501 may be an kylin chip.

The radio frequency circuit 502 may be used for reception and transmission of wireless signals. Specifically, the rf circuit 502 may receive downlink data of the base station and send the downlink data to the processor 501 for processing; in addition, the rf circuit 502 may also transmit uplink data to the base station.

In general, radio frequency circuitry 502 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency circuitry 502 may also communicate with other devices via wireless communication. The wireless communication may use any communication standard or protocol including, but not limited to, global system for mobile communications, general packet radio service, code division multiple access, wideband code division multiple access, long term evolution, email, short message service, and the like.

The memory 503 is used to store computer programs and may also be used to store data. The memory 503 may be, but is not limited to, a read-only memory (ROM) or a Random Access Memory (RAM), an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disc, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store program code and that can be accessed by a computer.

The processor 501 may perform various functions of the relay UE and data processing by executing a computer program stored in the memory 503.

The memory 503 may include a program storage area and a data storage area. Wherein, the storage program area can store an operating system and application programs (such as a sound playing function and an image playing function) required by at least one function; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the relay UE.

The memory 503 may store a computer program for implementing a modular function, and is controlled by the processor 501 to execute. The processor 501 is configured to execute the computer program stored in the memory 503, thereby implementing the methods provided by the embodiments described below in the present application.

In addition, the memory 503 may include high speed random access memory, and may also include non-volatile memory, such as a magnetic disk storage device, a flash memory device, or other volatile solid state storage device. The memory 503 may store various operating systems, such as an iOS operating system, an Android (Android) operating system, and the like.

The relay UE may also include at least one or more sensors 506, such as light sensors, motion sensors, and other sensors. Specifically, the light sensor may include an ambient light sensor that may adjust the brightness of the display of the touch screen 504 according to the brightness of ambient light, and a proximity sensor that may turn off the power of the display when the relay UE moves to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally, three axes), can detect the magnitude and direction of gravity when stationary, and can be used for applications (such as horizontal and vertical screen switching, related games, magnetometer attitude calibration) for recognizing the attitude of the smartphone, and related functions (such as pedometer and tapping) for vibration recognition; as for other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which may be further configured by the relay UE, detailed descriptions thereof are omitted.

The audio circuitry 509, speaker 513, microphone 514 may provide an audio interface between the user and the relay UE. The audio circuit 509 may transmit the received electrical signal converted from the audio data to the speaker 513, and convert the electrical signal into an audio signal for output by the speaker 513; on the other hand, the microphone 514 converts the collected sound signals into electrical signals, which are received by the audio circuit 509 and converted into audio data, which are then output to the radio frequency circuit 502 for transmission to, for example, another UE, or to the memory 503 for further processing.

Although not shown in fig. 5, the relay UE may further include a camera (front camera and/or rear camera), a flash, a micro-projector, a near-field communication (NFC) device, and the like, which will not be described herein.

It should be understood that the above-mentioned hardware modules included in the relay UE shown in fig. 5 are only exemplary descriptions and are not limiting to the present application. In fact, the remote UE and the relay UE provided in the embodiments of the present application may further include other hardware modules having an interactive relationship with the hardware modules illustrated in the drawings, and are not limited herein.

It should be noted that AN/RAN device in this application may be a base station. For example, the base station may be an Ng-eNB, a gNB, or a transmission/reception point (TRP). But also a base station as defined by 3 GPP. E.g., an eNB or e-NodeB, etc.

Furthermore, when the eNB accesses a core network of the NR, or a Next Generation Core (NGC) or a 5G core network (5 GC), the eNB may also be referred to as an lte eNB. Specifically, the LTE eNB is an LTE base station device that evolves on the basis of the eNB, and may be directly connected to the 5G CN, and the LTE eNB also belongs to a base station device in the NR.

Alternatively, the AN/RAN device may also be a Wireless Terminal (WT). Such as an Access Point (AP) or an Access Controller (AC), or other network device capable of communicating with the UE and the core network. For example, relay devices, in-vehicle devices, smart wearable devices, and the like. The application does not limit the type of AN/RAN device.

Referring to fig. 6, fig. 6 is a schematic diagram illustrating a hardware structure of a network device. The network device 600 may be AN/RAN device in the radio access network shown in fig. 1 or fig. 3, or AN/RAN device in the AN/RAN shown in fig. 4, or a core network element such as AMF, SMF, or PCF shown in fig. 4. As shown in fig. 6, network device 600 may include a processor 601, a communication link 602, a memory 603, and at least one communication interface (which is illustrated in fig. 6 by way of example only as including communication interface 604).

Processor 601 may include one or more processors, where a processor may be, without limitation, a CPU, a microprocessor, a specific ASIC, or other integrated circuit.

The communication link 602 may include a path for communicating information between the aforementioned components.

A communication interface 604 for communicating with other devices or a communication network.

Memory 603 may be, but is not limited to, ROM or RAM, or EEPROM, CD-ROM, or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or 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.

It should be noted that the memory may be separate and coupled to the processor via the communication line 602. The memory may also be integral to the processor.

The memory 603 is used for storing computer programs, among other things. The processor 601 is configured to execute the computer program stored in the memory 603, so as to implement the method of the relevant network element provided by any of the method embodiments described below in the present application.

It is noted that processor 601 may include one or more CPUs, such as CPU0 and CPU1 in fig. 6. In addition, fig. 6 is only an example of a network device, and does not limit the specific structure of the network device. For example, the network device may also include other functional modules.

The embodiment of the application provides a data transmission method of proximity service, which is used for meeting the requirement of application on QoS diversification, performing QoS requirement management and control based on QoS flow, and realizing the determination of a Uu interface communication link (such as DRB) and a PC5 interface communication link (such as SLRB) through mapping of Uu QoS parameters to PC5QoS parameters, so as to solve the problem that the service data transmission cannot be completed due to the mismatching of the QoS parameters of the Uu interface communication link and the PC5 interface communication link in the conventional technology.

The data transmission method of the proximity service provided by the embodiment of the present application is specifically described below with reference to the accompanying drawings:

fig. 7 illustrates a data transmission method for proximity services according to an embodiment of the present application, which may be based on the foregoing architecture, which is described in detail below.

S701, the relay UE acquires the corresponding relation between the first communication link and the second communication link.

The first communication link may be a Uu interface communication link, where the Uu interface communication link refers to a communication link established between the relay UE and the access network device through a Uu interface, and may be used to transmit data of the first service between the relay UE and the access network device. For example, the first communication link may be a Data Radio Bearer (DRB). The DRB is used for transmitting data of the first service between the relay UE and the access network equipment.

Wherein the second communication link may be a PC5 interface communication link for transmitting data of the first service between the relay UE and the remote UE. For example, the second communication link may be a sidelink radio bearer (SLRB).

It should be noted that, for specific descriptions of DRBs and SLRBs, reference may be made to explanations and descriptions in the conventional art, and further description is not repeated here.

The first service may be a service that the remote UE desires or is about to use for relay UE transmission. The first service may be a specific service, such as a video service, a voice service, a color ring service, a text transmission service, etc.; or may be a certain type of service, such as a network slicing service, an instant messaging service, a life service, etc.

S701 may be implemented as follows.

In the first mode, the relay UE directly receives the correspondence between the first communication link and the second communication link from the access network device.

It should be noted that the corresponding relationship may be explicit or implicit, for example, the same message carries the identification information of the first communication link and the identification information of the second communication link.

And secondly, the relay UE receives the identification information of the first communication link and the identification information of the second communication link from the access network equipment, and then establishes the corresponding relation between the first communication link and the second communication link according to the identification information of the first communication link and the identification information of the second communication link.

For example, the relay UE may receive, from the access network device, configuration information of a first communication link and configuration information of a second communication link, where the configuration information of the first communication link includes identification information of the first communication link, and the configuration information of the second communication link includes identification information of the second communication link.

Wherein the identification information of the first communication link is used for identifying the first communication link, for example, the first communication link is a first DRB, and the identification information of the first communication link is an id (identity) of the first DRB. The identification information of the second communication link is used to identify the second communication link, for example, the second communication link is the first SLRB, and the identification information of the second communication link is the ID of the first SLRB.

And thirdly, the relay UE receives the corresponding relation between the first communication link and the at least two PC5 interface communication links from the access network equipment, selects a second communication link from the received at least two PC5 interface communication links, and establishes the corresponding relation between the first communication link and the second communication link.

The relay UE can select a second communication link from the received at least two PC5 interface communication links according to the condition (such as occupancy rate) that the at least two PC5 interface communication links are occupied; the relay UE may also determine a correspondence between the received at least two PC5 interface communication links and the PC5QoS parameters, as well as the PC5QoS parameters of the first traffic. A second communication link is selected from the received at least two PC5 interface communication links.

Wherein the PC5QoS parameters of the first service comprise one or more of the following parameters: resource type of the PC5 interface, scheduling priority of the PC5 interface, time delay of the PC5 interface, packet loss rate of the PC5 interface, maximum burst traffic of the PC5 interface, or time window size of the PC5 interface.

The resource types of the PC5 interface include one or more of the following: a Guaranteed Bit Rate (GBR) type, a Non-guaranteed bit rate Non-GBR type, and a Delay-critical guaranteed bit rate (Delay-critical GBR) type. The GBR type means that a corresponding bit rate can be maintained even in a situation where network resources are tight. Non-GBR type means that the network does not provide the lowest transmission rate guarantee, i.e. in case of network congestion, the traffic needs to bear the requirement of reducing the rate. The Delay-critical GBR is used for processing packet loss of service data exceeding a specified time Delay limit and counting the packet loss rate; and for the service data which does not exceed the specified time delay limit, normally transmitting. The scheduling priority of the Uu interface defines the importance of the service, and when the system resources are limited, the scheduling priority of the Uu interface determines whether the QoS flow is accepted or rejected by the Uu interface. The delay of the Uu interface defines the requirements of the service on the transmission delay. The packet loss rate of the Uu interface defines the requirement of the service on the packet loss rate. For example, delay-sensitive services of voice, video call, internet of things, internet of vehicles and other industrial controls generally have higher requirements on transmission rate, delay and packet loss rate. The maximum burst traffic of the Uu interface defines the traffic requirement for the maximum burst traffic. The time window size of the Uu interface defines the traffic requirements for the time window size.

And in the fourth mode, the relay UE determines the second communication link according to the received PC5QoS parameter of the first service, receives the identification information of the first communication link from the access network equipment, and then establishes the corresponding relation between the first communication link and the second communication link.

For example, the relay UE may receive the PC5QoS parameter for the first traffic from the remote UE.

And fifthly, the relay UE receives the identification information of the first communication link from the access network equipment, receives the identification information of the second communication link from the remote UE, and then establishes the corresponding relation between the first communication link and the second communication link.

For example, the relay UE may receive configuration information of the second communication link from the remote UE, the configuration information of the second communication link including identification information of the second communication link.

S702, the relay UE transmits the data of the first service of the remote UE according to the corresponding relation between the first communication link and the second communication link.

It is noted that the transmission referred to in the present application may include sending and/or receiving, without limiting the direction of transmission.

For example, in S702, the relay UE may receive uplink data of a first service from the remote UE and send the uplink data of the first service to the access network device; the relay UE may also receive downlink data of the first service from the access network device, and send the downlink data of the first service to the remote UE.

For example, when uplink data of a first service from a remote UE arrives at a relay UE through a second communication link, the relay UE sends the uplink data of the first service to an access network device through the first communication link corresponding to the second communication link. When downlink data of a first service from access network equipment reaches relay UE through a first communication link, the relay UE sends the downlink data of the first service to remote UE through a second communication link corresponding to the first communication link.

In the embodiment shown in fig. 7, the relay UE acquires the correspondence between the first communication link (e.g., DRB) and the second communication link (e.g., SLRB), so that the service data of the first service can be transmitted between the remote UE and the relay UE through the second communication link and the first communication link between the relay UE and the access network device according to the correspondence. Through the scheme, the problem that service data transmission cannot be completed due to the fact that QoS parameters of the first communication link (such as DRB) and the second communication link (such as SLRB) are not matched in the conventional technology can be solved.

Optionally, in an implementation scenario of the foregoing embodiment, before obtaining the correspondence between the first communication link and the second communication link, the method further includes: a first communication link and a second communication link are determined.

Specifically, the first communication link and the second communication link may be determined by three ways:

mode (1), the access network device determines a first communication link and a second communication link.

In one implementation, the access network device may determine, according to the Uu QoS requirement information of the first service, to transmit data of the first service through a first communication link between the access network device and the relay UE, and determine, according to the correspondence between the first Uu QoS parameter and the first PC5QoS parameter, and the Uu QoS requirement information of the first service, a second communication link.

The Uu QoS requirement information of the first service refers to a QoS configuration requirement of the first service on a Uu interface. The Uu QoS requirement information of the first service at least comprises one or more of the following parameters of the first service to Uu interface: the resource type of the Uu interface, the scheduling priority of the Uu interface, the time delay of the Uu interface, the packet loss rate of the Uu interface, the maximum burst flow of the Uu interface or the time window size of the Uu interface.

The resource type of the Uu interface may include one or more of the following: GBR type, Non-GBR type and Delay-critical GBR type. For example, the Uu QoS requirement information of the first service in the embodiment of the present application may be received by the access network device from the SMF network element through a PDU session. The first Uu QoS parameter is used for transmitting data of a first service through a Uu interface between the relay UE and the access network equipment; the first PC5QoS parameter is used to transmit data of the first traffic over the PC5 interface between the relay UE and the remote UE.

For example, in this embodiment of the present application, the access network device may select, from multiple Uu interface communication links that may be used by the access network device, one Uu interface communication link (for example, the first communication link) that best meets one or more QoS parameter requirements of the first service on the Uu interface, such as resource type, scheduling priority, delay, packet loss rate, maximum burst traffic, or time window size, to perform transmission of service data of the first service between the access network device and the relay UE. And, after the access network device determines the first communication link, the access network device may determine a PC5QoS parameter (e.g., a first PC5QoS parameter) corresponding to a Uu QoS parameter (e.g., a first Uu QoS parameter) that the first communication link is capable of satisfying, thereby selecting one PC5 interface communication link (e.g., a second communication link) that is capable of satisfying the first PC5QoS parameter from among the plurality of PC5 interface communication links that the relay UE may use. It should be noted that, for the mode (1), reference may be specifically made to the related description in the embodiment shown in fig. 8 or fig. 9, and details are not repeated.

And (2) the access network equipment determines the first communication link and informs the relay UE of the information of the first communication link. The relay UE determines a second communication link based on the candidate PC5 interface communication link.

Specifically, the access network device may determine, according to the Uu QoS requirement information of the first service, to transmit data of the first service through the first communication link between the access network device and the relay UE.

Wherein the candidate PC5 interface communication link may be determined by the access network device and inform the relay UE of information of the candidate PC5 interface communication link. The information of the candidate PC5 interface communication link may be identification information of the candidate PC5 interface communication link, such as an ID of the candidate PC5 interface communication link.

In one example, the access network device may determine at least two PC5 interface communication links (i.e., candidate PC5 interface communication links) of the remote UE according to the correspondence between the first Uu QoS parameter and the first PC5QoS parameter and the Uu QoS requirement information of at least two services (e.g., the first service, the second service, and the third service) of the remote UE, and inform the relay UE of the identification information of the at least two PC5 interface communication links for the relay UE to select the second communication link.

The corresponding relation between the first Uu QoS parameter and the first PC5QoS parameter may be obtained by the access network device from the PCF network element.

In another example, the access network device may determine at least two PC5 interface communication links (i.e., candidate PC5 interface communication links) for the relay UE to select from based on the correspondence of the first Uu QoS parameter to the first PC5QoS parameter and the Uu QoS requirement information for traffic of the same or similar QoS requirements for different remote UEs (e.g., remote UE 1, remote UE 2, and remote UE 3).

It should be noted that, for the mode (2), reference may be specifically made to the related description in the embodiment shown in fig. 10 or fig. 11, and details are not repeated.

And (3) the access network equipment determines the first communication link and informs the relay UE of the information of the first communication link. The remote UE or the relay UE determines the second communication link according to the PC5QoS parameter of the first service.

For example, the access network device may determine the first communication link according to the correspondence between the first Uu QoS parameter and the first PC5QoS parameter, and the Uu QoS requirement information of the first service.

Wherein the information of the first communication link may be identification information of the first communication link or configuration information of the first communication link.

It should be noted that, for the mode (3), reference may be specifically made to the related description in the embodiment shown in fig. 12 or fig. 13, and details are not repeated.

Optionally, in another implementation scenario of the foregoing embodiment, the method further includes: the remote UE determines to transmit the first traffic using the relay UE.

In one example, the remote UE may determine to transmit the first service using the relay UE based on one or more of capability information of the remote UE, subscription information of the first service, subscription information of the remote UE, or the like. For example, when the remote UE has a first service transmission requirement, it determines to transmit the first service using the relay UE according to the capability information that the remote UE supports the relay mode transmission service and the subscription information that allows the relay mode transmission of the first service.

The embodiments shown in fig. 8 and 9 are described by taking an example in which the first communication link is the first DRB and the second communication link is the first SLRB.

Referring to fig. 8, a data transmission method for proximity services according to an embodiment of the present application is described as follows.

S801, the access network equipment receives Uu QoS requirement information of the first service.

The Uu QoS requirement information of the first service may refer to a QoS configuration requirement of the first service on a Uu interface.

The Uu QoS requirement information of the first service may include one or more of the following parameters of the Uu interface of the first service: the resource type of the Uu interface, the scheduling priority of the Uu interface, the time delay of the Uu interface, the packet loss rate of the Uu interface, the maximum burst flow of the Uu interface or the time window size of the Uu interface. The resource type of the Uu interface may include one or more of: GBR type, Non-GBR type, and Delay-critical guaranteed bit rate (Delay-critical GBR) type.

Specifically, the Uu QoS requirement information of the first service may be represented by a 5G QoS identifier (5G QoS Indication, 5 QI). Table 1 shows a mapping of 5QI to Uu QoS parameters.

TABLE 1

Or, the Uu QoS requirement information of the first service may also be represented in other forms, and the specific representation form of the Uu QoS requirement information is not specifically limited in this embodiment.

S802, the access network equipment determines to transmit the data of the first service through the first DRB according to the Uu QoS requirement information of the first service.

The first DRB may satisfy a QoS configuration requirement of the first service on the Uu interface, for example, the QoS configuration requirement may include a configuration requirement on QoS parameters of the Uu interface, such as a resource type, a scheduling priority, a time delay, a packet loss rate, a maximum burst traffic, or a time window size.

It is understood that the relay UE and the access network device may transmit traffic data via multiple communication links (e.g., multiple DRBs). Different communication links may be of different resource types, may achieve different scheduling priorities, delays, packet loss rates, maximum bursty traffic, or may use time windows of different sizes. The access network device may select, according to the Uu QoS requirement information of the first service, one DRB, such as the first DRB, that can meet the Uu QoS configuration requirement of the first service from the plurality of DRBs between the relay UE and the access network device.

S803, the access network equipment determines a first SLRB according to the corresponding relation between the first Uu QoS parameter and the first PC5QoS parameter and the Uu QoS requirement information of the first service.

Wherein the first SLRB may be used to transmit data of the first service between the relay UE and the remote UE.

The first Uu QoS parameter may be used for transmitting data of the first service over a Uu interface between the relay UE and the access network device.

The first PC5QoS parameters (i.e., the PC5QoS parameters for the first traffic) may be used to transport data for the first traffic over the PC5 interface between the relay UE and the remote UE.

Illustratively, the correspondence between the Uu QoS parameters and the PC5QoS parameters, which may be obtained and stored by the access network device, may be represented in the form of a correspondence between 5QI and a PC5QoS identifier (PC 5QoS Indication, PQI).

It should be noted that the correspondence between the Uu QoS parameters and the PC5QoS parameters mentioned in the present application may include one or more correspondences, each of which is a correspondence between one or a set of Uu QoS parameters and one or a set of PC5QoS parameters. For example, the correspondence between the Uu QoS parameter and the PC5QoS parameter includes: 5QI ═ 1 corresponds to PQI ═ 1; 5QI ═ 2 corresponds to PQI ═ 2.

Table 2 shows a mapping of PQI to PC5QoS parameters.

TABLE 2

Alternatively, the correspondence between the Uu QoS parameter and the PC5QoS parameter may be expressed in other forms, and the embodiment of the present application does not specifically limit the specific expression form of the correspondence between the Uu QoS parameter and the PC5QoS parameter.

In general, traffic data transmission between the relay UE and the remote UE may be performed via multiple communication links (e.g., multiple SLRBs). Different communication links may be of different resource types, may achieve different scheduling priorities, delays, packet loss rates, maximum bursty traffic, or may use time windows of different sizes.

In one example, the access network device may obtain and store a correspondence of Uu QoS parameters to PC5QoS parameters. Further, the access network device may correspond the Uu QoS requirement information of the first service to the PC5QoS parameter according to the correspondence between the Uu QoS parameter and the PC5QoS parameter and the Uu QoS requirement information of the first service. For example, the access network device selects one or a group of Uu QoS parameters that best satisfy one or more QoS parameter requirements of the first service to the Uu interface, such as resource type, scheduling priority, delay, packet loss rate, maximum burst flow or time window size, from the corresponding relationship between the Uu QoS parameters and the PC5QoS parameters, and determines one or a group of PC5QoS parameters corresponding to the one or the group of Uu QoS parameters. Then, from the determined one or set of PC5QoS parameters, a first SLRB capable of satisfying the one or set of PC5QoS parameters is determined. The first SLRB may satisfy QoS configuration requirements of the first traffic for a PC5 interface between the remote UE and the relay UE.

The PC5QoS parameter and the Uu QoS parameter having the corresponding relationship can generally satisfy the configuration requirements of the service on QoS parameters such as resource type, scheduling priority, time delay, packet loss rate, maximum burst flow or time window size.

For example, the Uu QoS requirement information of the first traffic of the remote UE includes the following parameter requirements: the resource type is GRB. The scheduling priority is 30, the time delay requirement is not higher than 50ms, and the packet loss rate is not higher than 10^-3The average time window size is 2000 ms. The correspondence relationship between the Uu QoS parameters and the PC5QoS parameters stored in the access network device includes a first Uu QoS parameter (for example, 5QI ═ 3) capable of meeting the configuration requirement of the first service QoS parameter, and a first PC5QoS parameter (for example, PQI ═ 3) matching the first Uu QoS parameter. The first Uu QoS parameter can meet the configuration requirements of the first service on QoS parameters such as the resource type of the Uu interface, the scheduling priority of the Uu interface, the time delay of the Uu interface, the packet loss rate of the Uu interface, the maximum burst flow of the Uu interface or the time window size of the Uu interface. The first PC5QoS parameter can satisfy the configuration requirement of the first service on the QoS parameters such as the resource type of the PC5 interface, the scheduling priority of the PC5 interface, the delay of the PC5 interface, the packet loss rate of the PC5 interface, the maximum burst flow of the PC5 interface, or the time window size of the PC5 interface.

In one example, the correspondence of Uu QoS parameters to PC5QoS parameters may be pre-stored in the access network device.

In another example, the correspondence of Uu QoS parameters to PC5QoS parameters may also be created and maintained by the PCF. The access network equipment can acquire the corresponding relation between the Uu QoS parameter and the PC5QoS parameter from the PCF network element through the AMF network element.

For example, the access network device may obtain the correspondence between the Uu QoS parameter and the PC5QoS parameter through steps S800-1 and S800-2 shown in fig. 8:

s800-1, PCF network element sends corresponding relation between Uu QoS parameter and PC5QoS parameter to AMF network element. Correspondingly, the AMF network element receives the corresponding relation between the Uu QoS parameter and the PC5QoS parameter from the PCF network element.

The PCF network element may receive the input of the network maintainer to maintain the corresponding relationship between the Uu QoS parameter and the PC5QoS parameter. Or, the PCF network element may also generate and maintain a corresponding relationship between the Uu QoS parameter and the PC5QoS parameter by itself, for example, the PCF network element generates a corresponding relationship between the Uu QoS parameter and the PC5QoS parameter according to the service subscription data and the transmission capabilities of the remote UE and the relay UE. Or, the PCF network element may also obtain the corresponding relationship between the Uu QoS parameter and the PC5QoS parameter in other manners, and the generation manner of the corresponding relationship between the Uu QoS parameter and the PC5QoS parameter is not specifically limited in this embodiment of the application.

S800-2, the AMF network element sends the corresponding relation between the Uu QoS parameter and the PC5QoS parameter to the access network equipment.

Correspondingly, the access network equipment receives the corresponding relation between the Uu QoS parameter and the PC5QoS parameter from the AMF network element.

Illustratively, in the process of registering the remote UE with the AMF network element, the remote UE carries capability information indicating that the remote UE supports direct communication using the PC5 interface in the registration request message, and the AMF network element may determine, according to the capability information, to send the correspondence between the Uu QoS parameter and the PC5QoS parameter to the access network device.

In addition, the AMF network element may also send Uu QoS requirement information of the first service to the access network device. Further, the AMF network element may also forward the QFI allocated by the SMF network element for the QoS flow to the access network device. The Uu QoS requirement information and the QFI of the first service may be sent to the access network device by the AMF network element when the corresponding relationship between the Uu QoS parameter and the PC5QoS parameter is sent, or may be sent to the access network device by the AMF network element alone, which is not limited in this embodiment of the present application.

In some embodiments, the AMF network element may further send, to the access network device, a PLMN list that can be used by the remote UE when performing ProSe communication, radio band information that can be used by the remote UE outside network coverage, QoS requirement information mapped to one or more of a PQI rule or a standardized PQI, and the like.

It should be noted that the AMF network element may send the corresponding relationship between the Uu QoS parameter and the PC5QoS parameter to the access network device in the process of registering the remote UE to the AMF network element, or send the corresponding relationship to the access network device in other flows of the remote UE, such as a service request flow, a PDU session establishment flow, or a PDU session recovery flow, which is not limited in this application.

S804, the access network equipment sends the first communication link information to the relay UE.

Wherein the first communication link information may be used to characterize a correspondence between the first DRB and the first SLRB.

Accordingly, the relay UE receives the first communication link information from the access network device.

The first DRB is used for transmitting data of a first service between the relay UE and the access network equipment, and the first SLRB is used for transmitting data of the first service between the relay UE and the remote UE. The corresponding relation between the first DRB and the first SLRB is established by the access network equipment. It can be understood that, after the access network device acquires the first DRB, the first SLRB and the QFI, the access network device may establish a corresponding relationship between the first DRB and the first SLRB for service data corresponding to the QFI, so as to transmit the service data of the service through a transmission channel formed by the first DRB and the first SLRB.

S805, the relay UE transmits configuration information of the first SLRB to the remote UE.

Accordingly, the remote UE receives configuration information of the first SLRB from the relay UE.

In this embodiment, the relay UE may send the configuration information of the first SLRB to the remote UE through the PC5 interface. And the configuration information of the first SLRB is used for the remote UE to transmit the data of the first service between the first SLRB and the relay UE.

Wherein, the configuration information of the first SLRB may include one or more of the following: identification information of the first SLRB, configuration information of an RLC layer in a PC5 interface protocol stack, or configuration information of a MAC layer in a PC5 interface protocol stack.

Wherein the identification information of the first SLRB may be used by the remote UE to determine a PC5 interface communication link for PC5 communication between the relay UE and the remote UE.

The configuration information of the RLC layer in the PC5 interface protocol stack and the configuration information of the MAC layer in the PC5 interface protocol stack may be used to unify the RLC layer and the MAC layer for the remote UE and the relay UE in the data processing manner, for example, unify the segmentation and reassembly manner of the data packet, unify the retransmission manner of the data packet, and the like.

S806, the relay UE transmits the data of the first service of the remote UE.

The transmission referred to in the present application may include sending and/or receiving, without limiting the transmission direction.

For example, when uplink data of the first service from the remote UE arrives at the relay UE through the first SLRB (as shown in S806-a in fig. 8), the relay UE may determine to transmit the uplink data of the first service to the access network device through the first DRB corresponding to the first SLRB according to the correspondence between the first DRB and the first SLRB, which is characterized by the first communication link information (as shown in S806-b in fig. 8).

When the downlink data of the first service from the access network device arrives at the relay UE through the first DRB (as shown in S806-b in fig. 8), the relay UE may determine to send the downlink data of the first service to the remote UE through the first SLRB corresponding to the first DRB according to the correspondence between the first DRB and the first SLRB, which is characterized by the first communication link information (as shown in S806-a in fig. 8).

Alternatively, in another embodiment, as shown in fig. 9, the method provided by this embodiment may be based on the method shown in fig. 8, and S804 is replaced with S901 and S902:

s901, the access network equipment sends the second communication link information to the relay UE.

S902, the relay UE establishes a corresponding relation between the first DRB and the first SLRB according to the second communication link information.

In one example, the second communication link information includes identification information of the first DRB and identification information of the first SLRB. For example, the second communication link information includes configuration information of the first DRB and configuration information of the first SLRB. Wherein, the configuration information of the first DRB may include one or more of the following: identification information of the first DRB, configuration information of an RLC layer in a Uu interface protocol stack or configuration information of an MAC layer in the Uu interface protocol stack. The configuration information of the first SLRB may include one or more of: identification information of the first SLRB, configuration information of an RLC layer in a PC5 interface protocol stack, or configuration information of a MAC layer in a PC5 interface protocol stack. Wherein, the identification information of the first DRB may be an ID of the first DRB, and the identification information of the first SLRB may be an ID of the first SLRB.

For example, the identification information of the DRB and/or the identification information of the SLRB may be represented by an ID of the RLC channel, and obviously, the identification information of the DRB or the identification information of the SLRB may be represented in other forms, which is not limited.

In the embodiment shown in fig. 8 or fig. 9, the access network device determines, according to the Uu QoS requirement information of the first service and the corresponding relationship between the Uu QoS parameter and the PC5QoS parameter, a first communication link (i.e., a first DRB) for transmitting the service data of the first service between the relay UE and the access network device, and a second communication link (i.e., a first SLRB) for transmitting the service data of the first service between the remote UE and the relay UE, so as to solve the problem that the transmission of the service data cannot be completed due to the mismatch between the QoS parameters of the Uu interface communication link and the PC5 interface communication link in the conventional technology.

The embodiments shown in fig. 10 and 11 are described by taking the example that the first communication link is the first DRB and the second communication link is the first SLRB, which will be described in detail as follows.

Fig. 10 shows another data transmission method for proximity services provided by the present application, which may be based on the embodiment shown in fig. 9, and further replaces S803 with S1001, S901 with S1002, and S902 with S1003 and S1004, which are described in detail below.

S1001, the access network equipment determines at least two PC5 interface communication links of the remote UE according to the corresponding relation between the first Uu QoS parameter and the first PC5QoS parameter and the Uu QoS requirement information of the first service.

That is, there may be multiple PC5 interface communication links (e.g., SLRB) that can satisfy the QoS configuration requirements of the first traffic of the remote UE (e.g., remote UE 1) for the PC5 interface between the remote UE 1 and the relay UE. The access network equipment can correspond the Uu QoS requirement information of the first service to the PC5QoS parameter according to the corresponding relation between the Uu QoS parameter and the PC5QoS parameter and the Uu QoS requirement information of the first service. For example, the access network device selects one or a group of Uu QoS parameters that can best meet the requirement of one or more QoS parameters of the first service to the Uu interface, such as resource type, scheduling priority, delay, packet loss rate, maximum burst flow or time window size, from the corresponding relationship between the Uu QoS parameters and the PC5QoS parameters, and determines one or more groups of PC5QoS parameters corresponding to the one or the group of Uu QoS parameters. Then, at least two PC5 interface communication links capable of satisfying the one or more sets of PC5QoS parameters are determined according to the determined one or more sets of PC5QoS parameters. The at least two PC5 interface communication links may each satisfy QoS configuration requirements of the first traffic for the PC5 interface between the remote UE 1 and the relay UE.

S1002, the access network equipment sends the third communication link information to the relay UE.

Accordingly, the relay UE receives the third communication link information from the access network device.

Wherein the third communication link information is used for characterizing the first corresponding relationship. The first correspondence is between the first DRB and at least two PC5 interface communication links of the remote UE.

For example, the third communication link information may be sent from the access network device to the relay UE in a table format, or may be sent to the relay UE in another format, which is not limited. Table 3 below is described as a table format, but the table may be in other formats and is not limited.

TABLE 3

Wherein the first DRB in table 3 is a communication link determined by the access network device for transmitting data of the first service between the access network device and the relay UE. The first SLRB, the second SLRB, and the third SLRB are candidate communication links that the access network device determines may be used to relay data of the first service transmitted between the UE and the remote UE 1. The correspondence relationship between "Uu interface communication link" and "PC 5 interface communication link" in table 3 is the first correspondence relationship.

S1003, the relay UE determines a first SLRB from at least two PC5 interface communication links of the remote UE represented by the third communication link information.

In one example, the relay UE may determine a second communication link, such as a first SLRB, for transmitting data of the first service from the at least two PC5 interface communication links of the remote UE according to a situation (such as occupancy) that the at least two PC5 interface communication links of the remote UE acquired from the access network device are occupied. For example, the relay UE may monitor the usage of at least two PC5 interface communication links of the remote UE, and select the PC5 interface communication link with the smallest occupancy rate as the second communication link. The occupancy rates of at least two PC5 interface communication links of the remote UE refer to a time ratio that the received power of the communication link monitored by the relay UE is greater than a preset power within a preset time period. Or, the time ratio that the signal intensity of the communication link monitored by the relay UE received the remote UE is smaller than the preset signal intensity.

S1004, the relay UE establishes a correspondence between the first DRB and the first SLRB.

In an example, in step S1002, the sending, by the access network device, the third communication link information to the relay UE includes: identification information of the first DRB and identification information of at least two PC5 interface communication links of the remote UE. In this case, the relay UE may determine the first SLRB from at least two PC5 interface communication links of the remote UE and establish a correspondence between the first DRB and the first SLRB.

For the embodiment shown in fig. 10, when downlink data of the first service from the access network device arrives at the relay UE through the first DRB, the relay UE may determine which SLRB to use to transmit the downlink data packet of the first service to the remote UE according to an SLRB flag (e.g., identification information of the first SLRB) added by the access network device in the downlink data packet of the first service. When uplink data of a first service from a remote UE reaches a relay UE, the relay UE transmits the uplink data packet of the first service to an access network device through a first DRB no matter whether the uplink data packet is transmitted to the relay UE through a first SLRB, a second SLRB or a third SLRB.

Optionally, in another example, as shown in fig. 11, the method provided in this embodiment may further include steps S1101-S1102 on the basis of the method shown in fig. 10, and S1003 is replaced with S1103, which is specifically described as follows.

S1101, the access network equipment sends the PC5QoS parameter of the first service to the relay UE.

Accordingly, the relay UE receives the PC5QoS parameter of the first traffic from the access network device.

The PC5QoS parameter of the first service may be determined by the access network device according to the Uu QoS requirement information of the first service, in combination with a corresponding relationship between the Uu QoS parameter and the PC5QoS parameter. For example, the PC5QoS parameter of the first service may be the PC5QoS parameter with the highest matching degree with the Uu QoS requirement information of the first service, in the correspondence relationship between the Uu QoS parameter and the PC5QoS parameter. For example, the Uu QoS requirement information of the first service is expressed by 5 QI:3, the PC5QoS parameter of the first service with the highest matching degree can be represented by PQI: and 3, and (b).

S1102, the access network equipment sends the second corresponding relation to the relay UE. The second correspondence is between at least two PC5 interface communication links of the remote UE characterized by the third communication link information and the PC5QoS parameters.

Accordingly, the relay UE receives the second correspondence from the access network device.

In some embodiments, the second correspondence may be sent by the access network device to the relay UE together with the first correspondence over the third communication link information. For example, the third communication link information may be sent by the access network device to the relay UE in the form of a table. As shown in table 4 below:

TABLE 4

Wherein the first DRB in table 4 is a communication link determined by the access network device for transmitting data of the first service between the access network device and the relay UE. The first SLRB, the second SLRB, and the third SLRB are candidate communication links that the access network device determines can be used for relaying data of the first service between the UE and the remote UE. PQI: 3. PQI: 4 and PQI: 5 are PC5QoS parameters corresponding to the first SLRB, the second SLRB, and the third SLRB, respectively. The correspondence relationship between "Uu interface communication link" and "PC 5 interface communication link" in table 4 is the first correspondence relationship. The second correspondence relationship is a correspondence relationship between "PC 5 interface communication link" and "PC 5QoS parameter" in table 4.

S1103, the relay UE determines a first SLRB from at least two PC5 interface communication links of the remote UE represented by the third communication link information according to the PC5QoS parameter of the first service, the first corresponding relation and the second corresponding relation.

In one example, the relay UE may know, according to the first corresponding relationship, that the first SLRB, the second SLRB, and the third SLRB are candidate communication links that may be used for transmitting data of the first service between the relay UE and the remote UE, and may know, according to the second corresponding relationship, that the first SLRB, the second SLRB, and the third SLRB may respectively reach PQI: 3. PQI: 4 and PQI: 5, and the PC5QoS parameter of the first service is PQI:3, so that the relay UE can determine that the first SLRB, the second SLRB and the third SLRB, which can best meet the PC5 interface transmission requirement of the first service, is the first SLRB, by combining the above information.

It is known that the data transmission method of the proximity service provided by the present application is based on QoS flow to perform QoS requirement management. In one example, when the access network device performs mapping between QoS flows and DRBs, different QoS flows may be mapped onto the same DRB. For example, QoS flows mapped onto the same DRB have partially similar or identical QoS parameters. For example, different QoS flows have the same scheduling priority, or similar delay or packet loss rates, etc.

Therefore, assuming that the remote UE has transmission requirements of the first service and the second service, and the QoS flows used by the first service and the second service are different, but some QoS parameters are similar or the same, the QoS flow of the first service and the QoS flow of the second service can be mapped to the same DRB for transmission. In this case, in step S1002, the third communication link information sent by the access network device to the relay UE may include the first corresponding relationship and the second corresponding relationship. Wherein the first correspondence is between the first DRB and at least two PC5 interface communication links (including a second communication link (e.g., a first SLRB) and a third communication link (e.g., a second SLRB)) of the remote UE 1; the second correspondence is a correspondence between each PC5 interface communication link in the first correspondence and the PC5QoS parameters. As shown in table 5 below:

TABLE 5

The first DRB in table 5 above is a Uu interface communication link determined by the access network device for transmitting data of the first service and the second service of the remote UE 1 between the access network device and the relay UE. The first DRB is determined by the access network equipment according to the received Uu QoS requirement information of the first service and the Uu QoS requirement information of the second service. The first SLRB and the second SLRB are PC5 interface communication links determined by the access network device for transmitting data of the first service and the second service, respectively, between the remote UE 1 and the relay UE. The first SLRB is determined by the access network equipment according to the corresponding relation between the first Uu QoS parameter and the first PC5QoS parameter and the Uu QoS requirement information of the first service. And the second SLRB is determined by the access network equipment according to the corresponding relation between the second Uu QoS parameter and the second PC5QoS parameter and the Uu QoS requirement information of the second service. The second Uu QoS parameter is used to transmit data of the second service through the Uu interface between the relay UE and the access network device, and the second PC5QoS parameter is used to transmit data of the second service through the PC5 interface between the relay UE and the remote UE 1. For the method of determining the SLRB according to the correspondence between the Uu QoS parameter and the PC5QoS parameter and the Uu QoS requirement information of the service, reference may be made to the above description, which is not described herein again.

In this case, the relay UE may determine, from the first SLRB and the second SLRB, a second communication link that can satisfy the transmission requirement of the first service, that is, the first SLRB, in combination with the PC5QoS parameter of the first service according to the third communication link information.

Further optionally, if the remote UE 1 has a third service transmission requirement in addition to the first service and the second service transmission requirement, and QoS requirements of the first service, the second service, and the third service are the same or similar, the first service, the second service, and the third service may be mapped to the same QoS stream for transmission.

In this case, in step S1002, the third communication link information sent by the access network device to the relay UE may include the first corresponding relationship and the second corresponding relationship. Wherein the first correspondence is between the first DRB and at least two PC5 interface communication links (including a second communication link (e.g., a first SLRB), a third communication link (e.g., a second SLRB), and a fourth communication link (e.g., a third SLRB)) of the remote UE 1; the second correspondence is a correspondence between each PC5 interface communication link in the first correspondence and the PC5QoS parameters. In this case, the first DRB is a Uu interface communication link determined by the access network device for transmitting data of the first, second and third services of the remote UE 1 between the access network device and the relay UE. The first DRB is determined by the access network equipment according to the received Uu QoS requirement information of the first service, the Uu QoS requirement information of the second service and the Uu QoS requirement information of the third service. The first SLRB, the second SLRB, and the third SLRB are PC5 interface communication links determined by the access network device for transmitting data of the first service, the second service, and the third service, respectively, between the remote UE 1 and the relay UE. The first SLRB is determined by the access network equipment according to the corresponding relation between the first Uu QoS parameter and the first PC5QoS parameter and the Uu QoS requirement information of the first service. And the second SLRB is determined by the access network equipment according to the corresponding relation between the second Uu QoS parameter and the second PC5QoS parameter and the Uu QoS requirement information of the second service. And the third SLRB is determined by the access network equipment according to the corresponding relation between the third Uu QoS parameter and the third PC5QoS parameter and the Uu QoS requirement information of the third service. The second Uu QoS parameter is used to transmit data of the second service through the Uu interface between the relay UE and the access network device, and the second PC5QoS parameter is used to transmit data of the second service through the PC5 interface between the relay UE and the remote UE 1. The third Uu QoS parameter is used for transmitting data of the third service through the Uu interface between the relay UE and the access network device, and the third PC5QoS parameter is used for transmitting data of the third service through the PC5 interface between the relay UE and the remote UE 1. In this case, the relay UE may determine, from the first SLRB, the second SLRB, and the third SLRB, a second communication link that can satisfy the transmission requirement of the first service, i.e., the first SLRB, in combination with the PC5QoS parameter of the first service according to the communication link information. In this case, when the downlink data of the first service from the access network device arrives at the relay UE through the first DRB, the relay UE may determine which SLRB to use to transmit the downlink data packet of the first service to the remote UE according to the PC5QoS parameter information (e.g., PQI: 3) added by the access network device to the downlink data packet of the first service. For example, the PC5QoS parameter information may be added in a packet header transmitted from the PDCP layer to the RLC layer or in a packet header transmitted from the adaptation layer to the RLC layer. When uplink data of a first service from a remote UE reaches a relay UE, the relay UE transmits the uplink data packet of the first service to an access network device through a first DRB no matter whether the uplink data packet is transmitted to the relay UE through a first SLRB, a second SLRB or a third SLRB.

In another example, if remote UE 1 and remote UE 2 have first traffic and fourth traffic transmission requirements, respectively, and the QoS requirements of the first traffic and the fourth traffic are the same or similar, then the first traffic and the fourth traffic may be mapped to the same QoS flow for transmission.

In this case, in the above step S1002, the third communication link information sent by the access network device to the relay UE may include a correspondence relationship between the first DRB and at least two PC5 interface communication links (including the second communication link (e.g., the first SLRB) and the fourth communication link (e.g., the fifth SLRB)). As shown in table 6 below:

TABLE 6

Wherein, the first DRB in table 6 is the Uu interface communication link determined by the access network device for transmitting data of the first service of the remote UE 1 and the fourth service of the remote UE 2 between the access network device and the relay UE. The first DRB is determined by the access network equipment according to the received Uu QoS requirement information of the first service and the received Uu QoS requirement information of the fourth service. The first SLRB is a PC5 interface communication link respectively determined by the access network device for transmitting data of the first service between the remote UE 1 and the relay UE. The first SLRB is determined by the access network equipment according to the corresponding relation between the first Uu QoS parameter and the first PC5QoS parameter and the Uu QoS requirement information of the first service. The second SLRB is a PC5 interface communication link respectively determined by the access network device for transmitting data of the fourth service between the remote UE 2 and the relay UE. And the second SLRB is determined by the access network equipment according to the corresponding relation between the fourth Uu QoS parameter and the fourth PC5QoS parameter and the Uu QoS requirement information of the fourth service. The fourth Uu QoS parameter is used to transmit data of the fourth service through the Uu interface between the relay UE and the access network device, and the fourth PC5QoS parameter is used to transmit data of the fourth service through the PC5 interface between the relay UE and the remote UE 1.

In this case, the relay UE may determine, from the first SLRB and the second SLRB, a second communication link that can satisfy the first traffic transmission requirement, that is, the first SLRB, in combination with the identification information of the remote UE 1 according to the third communication link information. In this case, when downlink data of the first service from the access network device arrives at the relay UE through the first DRB, the relay UE may determine which SLRB to use to transmit the downlink data packet of the first service to the remote UE according to the identification information (e.g., the remote UE 1) of the remote UE, which is added to the downlink data packet of the first service by the access network device. When uplink data of a first service from a remote UE arrives at a relay UE, the relay UE transmits the uplink data packet of the first service to an access network device through a first DRB no matter whether the uplink data packet is transmitted to the relay UE through a first SLRB or a second SLRB.

In one example, the access network device may also autonomously determine a correspondence of the first Uu QoS parameter to the first PC5QoS parameter. For example, in the process that the remote UE accesses the 5GC through the relay UE to establish or update the PDU session, the access network device may determine the correspondence between the first Uu QoS parameter and the first PC5QoS parameter according to the PC5QoS parameter (i.e., the first PC5QoS parameter) of the first service of the remote UE sent by the AMF network element from the PCF network element and the Uu QoS parameter (i.e., the first Uu QoS parameter) of the first service sent by the AMF network element. For example, the access network device may map the first PC5QoS parameter with the first Uu QoS parameter on its own.

In this case, generally, during the process that the remote UE accesses the 5GC through the relay UE to establish or update the PDU session, the PCF network element may send Uu QoS requirement information of the first service to the SMF network element through the PCC rule. And the SMF network element maps the data flow to the QoS flow according to the PCC rule, and sends the QoS flow information and the Uu QoS parameter of the first service to the access network equipment through the N2 message. The access network equipment may map the Uu QoS parameter of the first service with a PC5QoS parameter of the plurality of PC5QoS parameters from the PCF forwarded by the AMF received by the access network equipment through the N1 message. And obtaining the corresponding relation between the first PC5QoS parameter and the first Uu QoS parameter. Then, the access network device may determine the first DRB and the first SLRB according to the corresponding relationship between the first PC5QoS parameter and the first Uu QoS parameter; alternatively, a first DRB and at least two PC5 communication links are determined, and so on.

It will be appreciated that the communication mode of the PC5 interface used by the relay UE with the remote UE may be an ad hoc mode or an autonomous resource scheduling mode. That is, the PC5 interface communication link may be selected by the relay UE or the remote UE in a radio resource pool pre-configured by an access network device (e.g., a base station) or a core network device (e.g., a PCF network element). The wireless resource pool comprises a plurality of SLRBs which can be selected by the relay UE or the remote UE. In this case, as described in the embodiments corresponding to fig. 10, fig. 11, and table 5 or table 6, the access network device does not directly allocate the first SLRB to the relay UE and the remote UE.

For the embodiments corresponding to fig. 10, fig. 11, or table 5 or table 6 above, determining, by the access network device, a first communication link (i.e., a first DRB) for transmitting traffic data of the first traffic between the relay UE and the access network device according to the Uu QoS requirement information of the first traffic; the access network equipment determines at least two PC5 interface communication links according to the Uu QoS requirement information of the first service and the corresponding relation between the first Uu QoS parameter and the first PC5QoS parameter, so that the relay UE can select a second communication link (namely, a first SLRB) which is finally used for transmitting the service data of the first service between the remote UE and the relay UE, and the problem that the service data transmission cannot be completed due to the fact that the QoS parameters of the Uu interface communication link and the PC5 interface communication link are not matched in the conventional technology is solved.

The embodiments shown in fig. 12 and 13 are described by taking the example that the first communication link is the first DRB and the second communication link is the first SLRB, which will be described in detail below.

Fig. 12 illustrates another data transmission method of the proximity service provided by the present application, in which the first SLRB is determined by the relay UE according to the PC5QoS parameter of the first service. Specifically, the method may be based on the embodiment shown in fig. 8, and further replace S800-1, S800-2, and S801-S804 with S1202-S1205, as described below.

S1201, the AMF network element sends the PC5QoS parameter of the first service of the remote UE from the PCF network element to the remote UE.

Accordingly, the remote UE receives the PC5QoS parameters for the first service from the AMF network element.

For example, during the process that the remote UE accesses the 5GC through the relay UE to establish or update the PDU session, the PCF network element sends the PC5QoS parameter of the first service to the AMF network element. The AMF network element may forward the PC5QoS parameter for the first service to the remote UE through the access network device and the relay UE.

Wherein the PC5QoS parameters of the first service comprise one or more of the following parameters: resource type of the PC5 interface, scheduling priority of the PC5 interface, time delay of the PC5 interface, packet loss rate of the PC5 interface, maximum burst traffic of the PC5 interface, or time window size of the PC5 interface. The resource types of the PC5 interface include one or more of the following: GBR type, Non-GBR type and Delay-critical GBR type.

S1202, the remote UE sends the PC5QoS parameter of the first service to the relay UE.

Accordingly, the relay UE receives the PC5QoS parameter of the first traffic from the remote UE.

S1203, the access network device sends the identification information of the first DRB to the relay UE.

For example, the access network device may send configuration information of the first DRB to the relay UE. The configuration information of the first DRB includes identification information of the first DRB. The identification information of the first DRB may be an ID of the first DRB.

Accordingly, the relay UE receives the identification information of the first DRB from the access network device.

The first DRB may be obtained by the access network device mapping the first service to the DRB according to the Uu QoS requirement information of the first service.

S1204, the relay UE determines a first SLRB according to the PC5QoS parameter of the first service.

In one example, the relay UE may map the first service to the SLRB according to the PC5QoS parameter of the first service, resulting in the first SLRB. Alternatively, the relay UE may select an SLRB that can match the PC5QoS parameter from the radio resource pool according to the PC5QoS parameter of the first service, and obtain the first SLRB. The radio resource pool is pre-configured for the relay UE by an access network device (e.g., a base station) or a core network device (e.g., a PCF network element), and the radio resource pool includes a plurality of SLRBs that can be selected by the relay UE.

S1205, the relay UE establishes a corresponding relation between the first DRB and the first SLRB according to the identification information of the first DRB and the determined first SLRB.

Alternatively, in another example, the first SLRB may be determined by the remote UE based on the PC5QoS parameters for the first service. Specifically, the method may be based on the embodiment shown in fig. 12, and further replace S1202 and S1204 with S1301 and S1302, and further replace S1205 and S805 with S1303, which is described in detail below.

S1301, the remote UE determines a first SLRB according to the PC5QoS parameter of the first service.

In one example, the remote UE may map the first traffic to the SLRB according to the PC5QoS parameters of the first traffic, resulting in a first SLRB. Alternatively, the remote UE may select an SLRB that can match the PC5QoS parameter from the radio resource pool according to the PC5QoS parameter of the first service to obtain the first SLRB. The radio resource pool is pre-configured for the remote UE by an access network device (e.g., a base station) or a core network device (e.g., a PCF network element), and the radio resource pool includes a plurality of SLRBs that can be selected by the remote UE.

S1302, the remote UE sends configuration information of the first SLRB to the relay UE.

Accordingly, the relay UE receives configuration information of the first SLRB from the remote UE.

Wherein the configuration information of the first SLRB at least comprises one or more of the following: identification information of the first SLRB (e.g., ID of the first SLRB), configuration information of an RLC layer in a PC5 interface protocol stack, or configuration information of a MAC layer in a PC5 interface protocol stack.

S1303, the relay UE establishes a corresponding relation between the first DRB and the first SLRB according to the identification information of the first DRB and the configuration information of the first SLRB.

In the embodiment shown in fig. 12 or fig. 13, by determining, by the access network device, a first communication link (i.e., a first DRB) for transmitting traffic data of the first traffic between the relay UE and the access network device, for example, according to Uu QoS requirement information of the first traffic; the relay UE or the remote UE determines a second communication link (namely, a first SLRB) for transmitting the service data of the first service between the remote UE and the relay UE according to the PC5QoS parameter of the first service, so as to solve the problem that the service data transmission cannot be completed due to the mismatching of the QoS parameters of the Uu interface communication link and the PC5 interface communication link in the conventional technology.

It should be understood that the various aspects of the embodiments of the present application can be reasonably combined and explained, and the explanation or explanation of the various terms appearing in the embodiments can be mutually referred to or explained in the various embodiments, which is not limited.

It should also be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

It is to be understood that the relay UE, the access network device, the remote UE or other network device (such as PCF network element, SMF network element or AMF network element) includes hardware structures and/or software modules for performing the functions of any of the above embodiments. Those of skill in the art would readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiment of the present application, functional modules of relay UE, access network device, remote UE or other network devices (such as PCF network element, SMF network element or AMF network element) may be divided, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.

For example, in a case that each functional module is divided in an integrated manner, as shown in fig. 14, the functional module is a structural block diagram of a UE provided in the embodiment of the present application. The UE may be a relay UE or a remote UE. The UE may include a transceiving unit 1410 and a processing unit 1420.

When the UE is a relay UE, the transceiver unit 1410 is configured to support the relay UE to perform the above steps S701, S804, S805, S806 (including S806-a and S806-b), S901, S1002, S1101, S1102, S1202, S1203, or S1302, and/or other processes for the techniques described herein. Processing unit 1420 is to support the relay UE to perform the above-described steps S702, S902, S1003, S1004, S1103, S1104, S1204, S1205, or S1303, and/or other procedures for the techniques described herein. When the UE is a remote UE, transceiving unit 1410 is configured to support the remote UE to perform steps S805, S806-a, S1201, S120, or S1302, and/or other processes for the techniques described herein. Processing unit 1420 is used to support the remote UE to perform step S1301 above, and/or other procedures for the techniques described herein.

Fig. 15 is a block diagram of a network device according to an embodiment of the present application. The network device may be the above-mentioned access network device, AMF network element, PCF network element, or SMF network element. The network device may include a transceiving unit 1510 and a processing unit 1520.

When the network device is an access network device, the transceiving unit 1510 may support the access network device to perform the above steps S800-2, S804, S806-b, S901, S1002, S1101, S1102 or S1203, and/or other processes for the techniques described herein. The processing unit 1520 may enable the access network device to perform the above steps S801, S802, S803, or S1001, and/or other processes for the techniques described herein. When the network device is an AMF network element, the transceiving unit 1510 may support the AMF network element to perform the above steps S800-1, S800-2, or S1201, and/or other processes for the techniques described herein. When the network device is a PCF network element, the transceiving unit 1510 can support the PCF network element to perform the above step S800-1 or S1201, and/or other processes for the techniques described herein.

It should be noted that the transceiver 1410 and the transceiver 1510 may include a radio frequency circuit. The UE or the network device may receive and transmit wireless signals through the radio frequency circuit. Typically, the radio frequency circuitry includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency circuitry may also communicate with other devices via wireless communication. The wireless communication may use any communication standard or protocol including, but not limited to, global system for mobile communications, general packet radio service, code division multiple access, wideband code division multiple access, long term evolution, email, short message service, and the like.

In an alternative, when the data transfer is implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are implemented in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware or may be embodied in software instructions executed by a processor. The software instructions may consist of corresponding software modules that may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may reside in a probing apparatus. Of course, the processor and the storage medium may reside as discrete components in the probe device.

Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions.

In an alternative, the present application provides a communication system that includes a remote UE, a relay UE, an access network device, an AMF unit, and a PCF unit. The communication system is used for realizing the data transmission method of the proximity service in any possible implementation mode provided by the application.

In an alternative aspect, the present application provides a chip system, which includes a processor, a memory, and a computer program code stored in the memory; the computer program code realizes a method for data transmission of an adjacent service in any of the possible implementations provided herein when executed by a processor. The chip system may be formed by a chip, and may also include a chip and other discrete devices.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical functional division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another device, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, that is, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributed to by the prior art, or all or part of the technical solutions may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for data transmission of an adjacent service, the method comprising:

the method comprises the steps that relay User Equipment (UE) acquires the corresponding relation between a first communication link and a second communication link; the first communication link is used for transmitting data of a first service between the relay UE and the access network equipment; the second communication link is used for transmitting the data of the first service between the relay UE and a remote UE;

and the relay UE transmits the data of the first service of the remote UE according to the corresponding relation.

2. The method according to claim 1, wherein the acquiring, by the relay user equipment UE, the correspondence between the first communication link and the second communication link includes:

the relay UE receiving the identification information of the first communication link and the identification information of the second communication link from the access network equipment;

and the relay UE establishes a corresponding relation between the first communication link and the second communication link according to the identification information of the first communication link and the identification information of the second communication link.

3. The method according to claim 1, wherein the acquiring, by the relay user equipment UE, the correspondence between the first communication link and the second communication link includes:

the relay UE receives the correspondence from the access network device.

4. The method according to claim 1, wherein the acquiring, by the relay user equipment UE, the correspondence between the first communication link and the second communication link includes:

the relay UE receiving a first correspondence from the access network device; the first correspondence is between the first communication link and at least two PC5 interface communication links of the remote UE;

the relay UE determines the second communication link from the at least two PC5 interface communication links;

the relay UE establishes a correspondence between the first communication link and the second communication link.

5. The method of claim 4, further comprising:

the relay UE receives a PC5 quality of service (QoS) parameter of the first service from the access network equipment;

the relay UE receives a second correspondence from the access network device; the second correspondence is between the at least two PC5 interface communication links and PC5QoS parameters;

the relay UE determining the second communication link from the at least two PC5 interface communication links, comprising:

the relay UE determines the second communication link from the at least two PC5 interface communication links according to the PC5QoS parameter of the first service, the first correspondence and the second correspondence.

6. The method of claim 5, wherein the PC5QoS parameters of the first traffic comprise one or more of the following parameters: a resource type of the PC5 interface, a scheduling priority of the PC5 interface, a latency of the PC5 interface, a packet loss rate of the PC5 interface, a maximum burst traffic of the PC5 interface, or a time window size of the PC5 interface;

wherein the resource types of the PC5 interface include one or more of the following: a guaranteed bit rate GBR type, a Non-guaranteed bit rate Non-GBR type, and a Delay-critical guaranteed bit rate Delay-critical GBR type.

7. The method of claim 1, further comprising:

the relay UE receives a PC5QoS parameter of the first service;

the relay UE acquiring the corresponding relation between the first communication link and the second communication link comprises the following steps:

the relay UE receiving identification information of the first communication link from the access network device;

the relay UE determines the second communication link according to the PC5QoS parameter of the first service;

8. The method according to claim 1, wherein the acquiring, by the relay user equipment UE, the correspondence between the first communication link and the second communication link includes:

the relay UE receiving configuration information for the second communication link from the remote UE;

the relay UE receives the identification information of the first communication link from the access network device;

and the relay UE establishes a corresponding relation between the first communication link and the second communication link according to the configuration information of the second communication link and the identification information of the first communication link.

9. The method of any of claims 1-7, wherein the first communication link is a Data Radio Bearer (DRB) and the second communication link is a sidelink radio bearer (SLRB).

10. A method for data transmission of an adjacent service, the method comprising:

the access network equipment receives Uu service quality QoS requirement information of a first service;

the access network equipment determines to transmit the data of the first service through a first communication link between the access network equipment and relay UE according to the Uu QoS requirement information of the first service;

the access network equipment determines a second communication link according to the corresponding relation between the first Uu QoS parameter and the first PC5QoS parameter and the Uu QoS requirement information of the first service; the second communication link is used for transmitting the data of the first service between the relay UE and a remote UE;

the access network equipment sends communication link information to the relay User Equipment (UE), wherein the communication link information is used for representing or establishing a corresponding relation between the first communication link and the second communication link;

wherein the first Uu QoS parameter is used for transmitting data of the first traffic through a Uu interface between the relay UE and the access network equipment, and the first PC5QoS parameter is used for transmitting data of the first traffic through a PC5 interface between the relay UE and the remote UE.

11. The method of claim 10, wherein the communication link information comprises a correspondence between the first communication link and the second communication link; or, the communication link information includes identification information of the first communication link and identification information of the second communication link.

12. The method of claim 10, further comprising:

the access network equipment receives Uu QoS requirement information of a second service;

the access network equipment determines to transmit the data of the second service through the first communication link according to the Uu QoS requirement information of the second service;

the access network equipment determines a third communication link according to the corresponding relation between the second Uu QoS parameter and the second PC5QoS parameter and the Uu QoS requirement information of the second service; the third communication link is used for transmitting the data of the second service between the relay UE and the remote UE;

wherein the communication link information comprises a correspondence between the first communication link and at least two PC5 interface communication links of the remote UE, the at least two PC5 interface communication links comprising the second communication link and the third communication link; the second Uu QoS parameter is used for transmitting data of the second service through a Uu interface between the relay UE and the access network equipment, and the second PC5QoS parameter is used for transmitting data of the second service through a PC5 interface between the relay UE and the remote UE.

13. The method of claim 12, further comprising:

the access network equipment receives Uu QoS requirement information of a third service;

the access network equipment determines to transmit the data of the third service through the first communication link according to the Uu QoS requirement information of the third service;

the access network equipment determines a fourth communication link according to the corresponding relation between the third Uu QoS parameter and the third PC5QoS parameter and the Uu QoS requirement information of the third service; the fourth communication link is used for transmitting the data of the third service between the relay UE and the remote UE;

wherein the at least two PC5 interface communication links further comprise the fourth communication link; the third Uu QoS parameter is used for transmitting data of the third service through a Uu interface between the relay UE and the access network equipment, and the third PC5QoS parameter is used for transmitting data of the third service through a PC5 interface between the relay UE and the remote UE.

14. The method according to any of claims 10-13, wherein the Uu QoS requirements information of the first traffic comprises one or more of: the resource type of the Uu interface, the scheduling priority of the Uu interface, the time delay of the Uu interface, the packet loss rate of the Uu interface, the maximum burst flow of the Uu interface, or the time window size of the Uu interface;

wherein the resource type of the Uu interface comprises one or more of the following: a guaranteed bit rate GBR type, a Non-guaranteed bit rate Non-GBR type, and a Delay-critical guaranteed bit rate Delay-critical GBR type.

15. The method according to any one of claims 10-14, further comprising:

and the access network equipment receives Uu QoS requirement information of the first service from a Session Management Function (SMF) network element through a Protocol Data Unit (PDU) session.

16. The method according to any one of claims 10-15, further comprising:

and the access network equipment receives the corresponding relation between the first Uu QoS parameter and the first PC5QoS parameter from a policy and control function PCF network element.

17. A relay User Equipment (UE), the UE comprising:

the processing unit is used for acquiring the corresponding relation between the first communication link and the second communication link; the first communication link is used for transmitting data of a first service between the relay UE and the access network equipment; the second communication link is used for transmitting the data of the first service between the relay UE and a remote UE;

and the transceiving unit is used for transmitting the data of the first service of the remote UE according to the corresponding relation.

18. The relay UE of claim 17, wherein the transceiver unit is further configured to receive, from the access network device, identification information of the first communication link and identification information of the second communication link;

the processing unit acquires a corresponding relation between the first communication link and the second communication link, and the method comprises the following steps:

19. The relay UE of claim 17, wherein the processing unit obtains a correspondence between the first communication link and the second communication link, and comprises:

the processing unit receives the corresponding relation from the access network equipment through the transceiving unit.

20. The relay UE of claim 17, wherein the transceiver unit is further configured to receive a first correspondence from the access network device; the first correspondence is between the first communication link and at least two PC5 interface communication links of the remote UE;

the processing unit determines the second communication link from the at least two PC5 interface communication links;

the processing unit establishes a correspondence between the first communication link and the second communication link.

21. The relay UE of claim 20, wherein the transceiver unit is further configured to receive a quality of service QoS parameter of the PC5 for the first traffic from the access network device; receiving a second correspondence from the access network device; the second correspondence is between the at least two PC5 interface communication links and PC5QoS parameters;

the processing unit determining the second communication link from the at least two PC5 interface communication links, including:

the processing unit determines the second communication link from the at least two PC5 interface communication links according to the PC5QoS parameter of the first traffic, the first correspondence and the second correspondence.

22. The relay UE of claim 21, wherein the PC5QoS parameters for the first traffic comprise one or more of the following parameters: a resource type of the PC5 interface, a scheduling priority of the PC5 interface, a latency of the PC5 interface, a packet loss rate of the PC5 interface, a maximum burst traffic of the PC5 interface, or a time window size of the PC5 interface;

23. The relay UE of claim 17, wherein the transceiver unit is further configured to receive a PC5QoS parameter of the first traffic; and receiving identification information of the first communication link from the access network device;

the processing unit determines the second communication link according to the PC5QoS parameter of the first service;

24. The relay UE of claim 17, wherein the transceiver unit is further configured to receive configuration information for the second communication link from the remote UE; and receiving identification information of the first communication link from the access network device;

and the processing unit establishes a corresponding relation between the first communication link and the second communication link according to the configuration information of the second communication link and the identification information of the first communication link.

25. The relay UE of any of claims 17-24, wherein the first communication link is a data radio bearer, DRB, and wherein the second communication link is a sidelink radio bearer, SLRB.

26. An access network device, characterized in that the access network device comprises:

a receiving and sending unit, configured to receive Uu QoS requirement information of a first service;

a processing unit, configured to determine, according to Uu QoS requirement information of the first service, to transmit data of the first service through a first communication link between the access network device and a relay UE; determining a second communication link according to the corresponding relation between the first Uu QoS parameter and the first PC5QoS parameter and the Uu QoS requirement information of the first service; the second communication link is used for transmitting the data of the first service between the relay UE and a remote UE;

the transceiver unit is further configured to send communication link information to the relay user equipment UE, where the communication link information is used to characterize or establish a correspondence between the first communication link and the second communication link;

27. The access network device of claim 26, wherein the communication link information includes a correspondence between the first communication link and the second communication link; or, the communication link information includes identification information of the first communication link and identification information of the second communication link.

28. The access network device of claim 26, wherein the transceiver unit is further configured to receive Uu QoS requirement information of the second service;

the processing unit is further configured to determine, according to Uu QoS requirement information of the second service, to transmit data of the second service through the first communication link; determining a third communication link according to the corresponding relation between the second Uu QoS parameter and the second PC5QoS parameter and the Uu QoS requirement information of the second service; the third communication link is used for transmitting the data of the second service between the relay UE and the remote UE;

29. The access network device of claim 28, wherein the transceiver unit is further configured to receive Uu QoS requirement information of a third service;

the processing unit is further configured to determine, according to Uu QoS requirement information of the third service, to transmit data of the third service through the first communication link; determining a fourth communication link according to the corresponding relation between the third Uu QoS parameter and the third PC5QoS parameter and the Uu QoS requirement information of the third service; the fourth communication link is used for transmitting the data of the third service between the relay UE and the remote UE;

30. An access network device according to any one of claims 26-29, wherein the Uu QoS requirements information for the first traffic includes one or more of: the resource type of the Uu interface, the scheduling priority of the Uu interface, the time delay of the Uu interface, the packet loss rate of the Uu interface, the maximum burst flow of the Uu interface, or the time window size of the Uu interface;

31. The access network device of any of claims 26-30,

the transceiver unit is further configured to receive Uu QoS requirement information of the first service from a session management function, SMF, network element through a protocol data unit, PDU, session.

32. The access network device of any of claims 26-31,

the transceiving unit is further configured to receive a correspondence between the first Uu QoS parameter and a first PC5QoS parameter from a policy and control function PCF network element.

33. A relay User Equipment (UE), comprising:

a memory for storing a computer program;

a processor for executing the computer program to implement the method of any one of claims 1-9.

34. An access network device, characterized in that the access network device comprises:

a memory for storing a computer program;

a processor for executing the computer program to implement the method of any one of claims 10-16.

35. A communication system, the communication system comprising:

the relay user equipment, UE, of any of claims 17-25 or 33; and

an access network apparatus as claimed in any one of claims 26 to 32 or 34.

36. A computer-readable storage medium, having computer program code stored thereon, which, when executed by a processing circuit, implements the method of any of claims 1-9 or 10-16.

37. A chip system, comprising a processing circuit, a storage medium having computer program code stored therein; the computer program code realizing the method of any of claims 1-9 or 10-16 when executed by the processing circuit.