A data transmission method and apparatus

Abstract

The application provides a data transmission method and device. The method comprises: a remote device determining a sidelink groupcast identifier, the sidelink groupcast identifier being used for identifying a groupcast between the remote device and a plurality of relay devices; and the remote device sending uplink data to the plurality of relay devices in a groupcast manner based on the sidelink groupcast identifier, the uplink data being data sent by the remote device to a radio access network device. The data transmission method provided by the application determines a sidelink groupcast identifier by a remote device, and sends the sidelink groupcast identifier to a relay device, so as to facilitate the transmission of uplink data to a radio access network device based on groupcast communication, and improve the efficiency of uplink data transmission.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communication, and more particularly, to a data transmission method and apparatus. BACKGROUND

[0002] User equipment to network (U2N) relay technology is a technology capable of improving cell coverage, and a U2N relay system is composed of a wireless access network device, a relay device, and a remote device. The wireless access network device and the relay device communicate through a Uu interface, and the relay device and the remote device communicate through a PC5 interface. The relay device can help the remote device access the wireless access network device to obtain services. For example, the relay device obtains data of the remote device from the wireless access network device and forwards the data of the remote device to the remote device. The transmission of uplink data is similar, that is, the relay device obtains data from the remote device and forwards the data to the wireless access network device.

[0003] While improving network coverage based on U2N relay, to further improve the downlink transmission efficiency of the remote device, multiple links can be further considered to provide services for the remote device, for example, the remote device establishes a non-direct link with the wireless access network device through multiple relay devices, and only sidelink exists, or the remote device establishes multiple non-direct links with the wireless access network device through multiple relay devices on one hand, and establishes a direct link with the wireless access network device on the other hand. However, when the remote device sends data to the wireless access network device through at least two links, there is a problem of low transmission efficiency. SUMMARY

[0004] The present application provides a data transmission method and apparatus, which can improve the transmission efficiency of uplink data.

[0005] In a first aspect, a data transmission method is provided, which includes: a remote device determining a sidelink groupcast identifier, the sidelink groupcast identifier being used to identify groupcast between the remote device and multiple relay devices; and the remote device sending uplink data to the multiple relay devices in a groupcast manner based on the sidelink groupcast identifier, the uplink data being data sent by the remote device to a wireless access network device.

[0006] In the embodiments of the present application, the remote device first determines a groupcast identifier, and sends uplink data to a wireless access network through multiple relay devices in a groupcast manner based on the groupcast identifier, thereby improving the reliability of the remote device sending uplink data through multiple relay devices, and also improving the transmission efficiency of uplink data.

[0007] With reference to the first aspect, in a first possible implementation of the first aspect, the method further includes: sending, by the remote device, a first message to the plurality of relay devices, the first message including the sidelink groupcast identification.

[0008] With reference to the first possible implementation of the first aspect, in a second possible implementation of the first aspect, the first message further includes sidelink bearer indication information and a first Uu bearer identification, the first Uu bearer identification being used to identify a first data radio bearer (DRB) between the remote device and the radio access network device, and the sidelink bearer indication information being used to indicate a sidelink groupcast bearer, the sidelink groupcast bearer having a correspondence relationship with the first DRB.

[0009] In the embodiments of the present application, the remote device sends the sidelink bearer indication information and the first Uu bearer identification having a correspondence relationship with the sidelink bearer indication information to the relay device, so that the relay device can know which sidelink groupcast bearer to receive the uplink data sent by the remote device, thereby improving the transmission efficiency of the uplink data.

[0010] With reference to the first aspect or any one of the first to second possible implementations of the first aspect, in a third possible implementation of the first aspect, the method further includes: receiving, by the remote device, a configuration message from the radio access network device, the configuration message including a sidelink bearer configuration, the sidelink bearer configuration being used to configure the sidelink groupcast bearers between the remote device and the plurality of relay devices, wherein the remote device determining the sidelink groupcast identification includes determining according to the configuration message.

[0011] With reference to the third possible implementation of the first aspect, in a fourth possible implementation of the first aspect, the method further includes: sending, by the remote device, a second message to the radio access network device, the second message including the sidelink groupcast identification.

[0012] With reference to the first aspect or any one of the first to second possible implementations of the first aspect, in a fifth possible implementation of the first aspect, after the remote device determines the sidelink groupcast identification, the method further includes: sending, by the remote device, a second message to the radio access network device, the second message including the sidelink groupcast identification; and receiving, by the remote device, a configuration message from the radio access network device, the configuration message including a sidelink bearer configuration, the sidelink bearer configuration being used to configure the sidelink groupcast bearers between the remote device and the plurality of relay devices, the sidelink groupcast bearers being used to transmit the uplink data in the groupcast corresponding to the sidelink groupcast identification.

[0013] With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the method further includes: receiving, by the remote device, first indication information from the radio access network device, the first indication information being used to instruct the remote device to determine the sidelink groupcast identification.

[0014] With reference to any one of the fourth to sixth possible implementation manners of the first aspect, in a seventh possible implementation manner of the first aspect, the second message further includes second indication information, the second indication information indicating that the sidelink groupcast identification corresponds to groupcast used for the remote device to transmit uplink data.

[0015] With reference to any one of the third to seventh possible implementation manners of the first aspect, in an eighth possible implementation manner of the first aspect, the sidelink bearer configuration includes sidelink bearer indication information, the sidelink bearer indication information being used to indicate a sidelink groupcast bearer, the configuration message further includes a first Uu bearer identification, the first Uu bearer identification being used to identify a first DRB between the remote device and the radio access network device, the sidelink bearer indication information being used to indicate a sidelink groupcast bearer, the sidelink groupcast bearer having a corresponding relationship with the first DRB.

[0016] With reference to any one of the second to eighth possible implementation manners of the first aspect, in a ninth possible implementation manner of the first aspect, the method further includes: the first DRB having a corresponding relationship with the sidelink groupcast bearer and a unicast bearer of the sidelink.

[0017] With reference to the ninth possible implementation manner of the first aspect, in a tenth possible implementation manner of the first aspect, the method further includes: receiving, by the remote device, third indication information from the radio access network device, the third indication information being used to instruct a transmission manner between the remote device and the plurality of relay devices to switch from groupcast communication to unicast communication or from unicast communication to groupcast communication.

[0018] In the embodiments of the present application, the configuration of unicast communication and groupcast communication between the remote device and the plurality of relay devices can be reserved at the same time, and the transmission manner between the remote device and the plurality of relay devices can be switched from unicast communication to groupcast communication or from groupcast communication to unicast communication according to the third indication information, so that the transmission manner between the remote device and the plurality of relay devices can be flexibly adjusted, and the efficiency of the remote device sending uplink data to the radio device is improved.

[0019] In a second aspect, a data transmission method is provided. The method comprises: receiving, by a relay device, a first message, the first message comprising a sidelink groupcast identifier, the sidelink groupcast identifier being used to identify a groupcast between a remote device and the relay device; and receiving, by the relay device, uplink data transmitted by the remote device in a groupcast manner based on the sidelink groupcast identifier, the uplink data being data transmitted by the remote device to a radio access network device.

[0020] In the embodiments of the present application, the relay device receives a sidelink groupcast identifier and receives uplink data transmitted by a remote device based on the groupcast identifier, and then transmits the uplink data to a radio access network device, thereby improving the efficiency of uplink data transmission.

[0021] With reference to the second aspect, in a first possible implementation manner of the second aspect, the first message further comprises sidelink bearer indication information and a first Uu bearer identifier, wherein the first Uu bearer identifier is used to identify a first data radio bearer (DRB) between the remote device and the radio access network device, and the sidelink bearer indication information is used to indicate a sidelink groupcast bearer, the sidelink groupcast bearer having a corresponding relationship with the first DRB.

[0022] With reference to the second aspect or the first possible implementation of the second aspect, in a second possible implementation manner of the second aspect, the receiving, by the relay device, the first message comprises: receiving, by the relay device, the first message from the remote device; or receiving, by the relay device, the first message from the radio access network device.

[0023] With reference to the second possible implementation of the second aspect, in a third possible implementation manner of the second aspect, when the first message is received from the remote device, the method further comprises: transmitting, by the relay device, a third message to the radio access network device, the third message comprising the sidelink groupcast identifier; and receiving, by the relay device, a configuration message from the radio access network device, the configuration message comprising sidelink bearer configuration and a second Uu bearer identifier, wherein the sidelink bearer configuration comprises sidelink bearer indication information, the sidelink bearer indication information being used to indicate a sidelink groupcast bearer, and the second Uu bearer identifier is used to identify a second data radio bearer (DRB) between the relay device and the radio access network device, the sidelink groupcast bearer having a corresponding relationship with the second DRB.

[0024] In the embodiments of the present application, the relay device sends a third message carrying a sidelink groupcast identifier to the wireless access network device, and receives sidelink bearer indication information and a second Uu bearer identifier corresponding to the sidelink bearer indication information sent by the wireless access network device, so that it knows which DRB to send uplink data in the sidelink groupcast bearer to the wireless access network device, thereby improving the transmission efficiency of the uplink data.

[0025] In combination with the third possible implementation of the second aspect, in a third possible implementation of the second aspect, the third message further includes second indication information, the second indication information indicating that the sidelink groupcast identifier corresponds to a groupcast used for the remote device to transmit uplink data.

[0026] In a third aspect, a data transmission method is provided, which includes: a wireless access network device sending a configuration message to a remote device, the configuration message including a sidelink bearer configuration, the sidelink bearer configuration being used to configure a sidelink groupcast bearer between the remote device and a relay device, the sidelink groupcast bearer being used to transmit uplink data in a groupcast corresponding to a sidelink groupcast identifier, the sidelink groupcast identifier being used to identify the groupcast between the remote device and the relay device; and the wireless access network device receiving a response message from the remote device.

[0027] In the embodiments of the present application, a data transmission method is provided, in which a wireless access network device sends a sidelink bearer configuration to a remote device, so that the remote device configures a sidelink groupcast bearer between the remote device and a relay device, and the sidelink groupcast bearer transmits uplink data in a groupcast corresponding to a sidelink groupcast identifier, thereby improving the transmission efficiency of the uplink data.

[0028] In combination with the third aspect, in a first possible implementation of the third aspect, the sidelink bearer configuration includes sidelink bearer indication information, the sidelink bearer indication information being used to indicate the sidelink groupcast bearer, the configuration message further including a first Uu bearer identifier, the first Uu bearer identifier being used to identify a first data radio bearer DRB between the remote device and the wireless access network device, the bearer indication information being used to indicate the sidelink groupcast bearer, the sidelink groupcast bearer having a corresponding relationship with the first DRB.

[0029] In combination with the third aspect or the first possible implementation of the third aspect, in a second possible implementation of the third aspect, after the wireless access network device sends the configuration message to the remote device, the method further includes: the wireless access network device receiving a second message from the remote device, the second message including the sidelink groupcast identifier.

[0030] With reference to the third aspect or the first possible implementation of the third aspect, in a third possible implementation of the third aspect, the method further includes: receiving, by the wireless access network device, a second message from the remote device, the second message including the sidelink groupcast identifier, wherein the wireless access network device transmits the configuration message to the remote device according to the second message.

[0031] With reference to the third possible implementation of the third aspect, in a fourth possible implementation of the third aspect, before the wireless access network device receives the second message from the remote device, the method further includes: transmitting, by the wireless access network device, first indication information to the remote device, the indication information being used to instruct the remote device to determine the sidelink groupcast identifier.

[0032] With reference to any one of the second to fourth possible implementations of the third aspect, in a fifth possible implementation of the third aspect, the method further includes: transmitting, by the wireless access network device, a first message to the relay device, the first message including the sidelink groupcast identifier.

[0033] With reference to the fifth possible implementation of the third aspect, in a sixth possible implementation of the third aspect, the first message further includes sidelink bearer indication information and a first Uu bearer identifier, the first Uu bearer identifier being used to identify a first data radio bearer (DRB) between the remote device and the wireless access network device, and the sidelink bearer indication information being used to indicate a sidelink groupcast bearer, the sidelink groupcast bearer having a correspondence relationship with the first DRB.

[0034] With reference to any one of the second to sixth possible implementations of the third aspect, in a seventh possible implementation of the third aspect, the second message further includes second indication information, the second indication information indicating that a groupcast corresponding to the sidelink groupcast identifier is used for the remote device to transmit uplink data.

[0035] With reference to the third aspect or the first possible implementation of the third aspect, in an eighth possible implementation of the third aspect, the method further includes: receiving, by the wireless access network device, a third message from the relay device, the third message including the sidelink groupcast identifier; and transmitting, by the wireless access network device, a configuration message to the relay device, the configuration message including sidelink bearer configuration and a second Uu bearer identifier, wherein the sidelink bearer configuration includes sidelink bearer indication information, the sidelink bearer indication information being used to indicate a sidelink groupcast bearer, and the second Uu bearer identifier being used to identify a second data radio bearer (DRB) between the relay device and the wireless access network device, the sidelink groupcast bearer having a correspondence relationship with the second DRB.

[0036] With reference to the eighth possible implementation of the third aspect, in a ninth possible implementation of the third aspect, the third message further includes second indication information, the indication information indicating that the sidelink groupcast identification corresponds to groupcast for the remote device to transmit uplink data.

[0037] With reference to the third aspect or any one of the first to ninth possible implementations of the third aspect, in a tenth possible implementation of the third aspect, the method further includes that the first DRB has a correspondence relationship with the sidelink groupcast bearer and a unicast bearer of the sidelink.

[0038] With reference to the tenth possible implementation of the third aspect, in an eleventh possible implementation of the third aspect, the method further includes that the wireless access network device sends third indication information to the remote device, the third indication information being used to indicate that a transmission mode between the remote device and the relay device is switched from groupcast communication to unicast communication or switched from unicast communication to groupcast communication.

[0039] A fourth aspect provides a data transmission method, the method including: a remote device obtaining first indication information, the first indication information indicating a split ratio of a data quantity in a packet data convergence protocol (PDCP) entity; and the remote device calculating a buffer status (BS) according to the split ratio indicated by the first indication information.

[0040] In the embodiments of the present application, the remote device determines the split ratio of the data quantity in the PDCP entity and the calculation manner of the BS in the BSR according to the first indication information, which on one hand avoids the over-scheduling problem caused by repeated BSR requests, and on the other hand makes the uplink transmission of the remote device adapt to the uplink status between the relay device and the wireless access network device, thereby improving the transmission efficiency of the uplink data.

[0041] With reference to the fourth aspect, in a first possible implementation of the fourth aspect, the split ratio includes a data ratio of the data quantity in the PDCP entity allocated to a first link and / or a data ratio of the data quantity in the PDCP entity allocated to a second link, the first link being used for the remote device to transmit uplink data to a wireless access network device, and the second link being used for the remote device to transmit uplink data to the wireless access network device through a plurality of relay devices; the remote device calculating the BS according to the split ratio includes calculating a BS in a first buffer status report (BSR) according to the split ratio and / or calculating a BS in a second BSR according to the split ratio, the first BSR being used to request scheduling of Uu uplink resources, and the second BSR being used to request sidelink resources; and the remote device sending the first BSR and / or the second BSR to the wireless access network device.

[0042] In a second possible implementation of the fourth aspect, in combination with the fourth aspect or any one of the first to second possible implementations of the fourth aspect, the remote device obtaining the first indication information comprises: the remote device receiving the first indication information from the radio access network device; or the remote device obtaining the first indication information pre-configured locally at the remote device.

[0043] In a third possible implementation of the fourth aspect, in combination with the fourth aspect or any one of the first to second possible implementations of the fourth aspect, the remote device calculating the buffer status BS according to the split ratio indicated by the first indication information comprises: all data quantity in the PDCP entity is allocated to a BS in the first BSR, wherein the remote device sends the first BSR to the radio access network device; or all data quantity in the PDCP entity is allocated to a BS in the second BSR, wherein the remote device sends the second BSR to the radio access network device; or data quantity in the PDCP entity is allocated to a BR in the first BSR and a BR in the second BSR in proportion, the split ratio ranges from greater than zero to less than 1, wherein the remote device sends the first BSR and the second BSR to the radio access network device.

[0044] In a fourth possible implementation of the fourth aspect, in combination with the fourth aspect or any one of the first to third possible implementations of the fourth aspect, the split ratio is applicable to all data radio bearers DRBs of the remote device, and the PDCP entity is a PDCP entity of the DRB of the remote device.

[0045] In a fifth possible implementation of the fourth aspect, in combination with the fourth aspect or any one of the first to fourth possible implementations of the fourth aspect, the first indication information further comprises a bearer identifier corresponding to the split ratio.

[0046] In a sixth possible implementation of the fourth aspect, in combination with the fourth aspect or any one of the first to fifth possible implementations of the fourth aspect, the method further comprises: the remote device receiving second indication information from the network device, the second indication information being used to indicate to the remote device to schedule the Uu uplink resource and the sidelink resource.

[0047] In the embodiments of the present application, the remote device schedules the Uu uplink resource and the sidelink resource simultaneously according to one second indication information sent by the radio access network device, so that the scheduling efficiency can be improved.

[0048] In a fifth aspect, a data transmission method is provided. The method comprises: sending, by a radio access network device, a first indication message to a remote device, the first indication message being used to indicate a split ratio of a data quantity in a packet data convergence protocol (PDCP) entity; and receiving, by the radio access network device, a first buffer status report (BSR) and / or a second BSR sent by the remote device, the first BSR being used to request scheduling of a Uu uplink resource, and the second BSR being used to request scheduling of a sidelink resource.

[0049] In the embodiments of the present application, the radio access network device sends a first indication message to the remote device, which is used to indicate that the remote device determines a split ratio of a data quantity in a PDCP entity, so that the remote device determines the calculation manner of a BS in a BSR, thereby avoiding the over-scheduling problem caused by repeated BSR requests.

[0050] In combination with the fifth aspect, in a first possible implementation manner of the fifth aspect, the split ratio comprises a data ratio of the data quantity in the PDCP entity allocated to a first link and / or a data ratio of the data quantity in the PDCP entity allocated to a second link, the first link being used to receive uplink data transmitted by the remote device by the radio access network device, and the second link being used to receive uplink data transmitted by the remote device by the radio access network device through a plurality of relay devices.

[0051] In combination with the fifth aspect or the first possible implementation of the fifth aspect, in a second possible implementation manner of the fifth aspect, the split ratio is applicable to all data radio bearers (DRBs) of the remote device, and the PDCP entity is a PDCP entity of the DRB of the remote device.

[0052] In combination with any one of the first to second possible implementation manners of the fifth aspect or the fifth aspect, in a third possible implementation manner of the fifth aspect, the first indication information further comprises a bearer identifier corresponding to the split ratio.

[0053] In combination with any one of the first to third possible implementation manners of the fifth aspect or the fifth aspect, in a fourth possible implementation manner of the fifth aspect, the method further comprises: sending, by the radio access network device, second indication information to the remote device, the second indication information being used to indicate to the remote device to schedule the Uu uplink resource and the sidelink resource.

[0054] In a sixth aspect, a data transmission method is provided. The method comprises: receiving, by a remote device, a configuration message from a radio access network device, the configuration message being used to configure a split ratio of an amount of data in a packet data convergence protocol (PDCP) entity sent by the remote device to a plurality of relay devices; and sending, by the remote device, data in the PDCP entity to the plurality of relay devices according to the split ratio, the data being uplink data sent by the remote device to the radio access network device.

[0055] In the embodiments of the present application, the remote device sends uplink data to the plurality of relay devices according to the split ratio of the amount of data in the PDCP entity configured according to the configuration information, so that the uplink transmission of the remote device is adapted to the uplink condition between the relay devices and the radio access network device, and the transmission efficiency of the uplink data is improved.

[0056] In combination with the sixth aspect, in a first possible implementation manner of the sixth aspect, the configuration message further comprises first indication information, the first indication information being used to indicate at least two sidelinks between the remote device and the plurality of relay devices, wherein the configuration message is used to configure the remote device to send a split ratio of an amount of data in the PDCP entity to each of the at least two sidelinks.

[0057] In combination with the sixth aspect, in a second possible implementation manner of the sixth aspect, the configuration message further comprises second indication information, the second indication information being used to indicate that one of the plurality of relay devices is a master device and the rest of the plurality of relay devices are auxiliary devices, wherein the configuration message is used to configure the remote device to send a split ratio of an amount of data in the PDCP entity to the master device and the auxiliary devices respectively.

[0058] In combination with the sixth aspect or any one of the first to second possible implementation manners of the sixth aspect, in a third possible implementation manner of the sixth aspect, the split ratio is applicable to all data radio bearers (DRBs) of the remote device, and the PDCP entity is a PDCP entity of the DRB of the remote device.

[0059] In a seventh aspect, a data transmission method is provided. The method comprises: sending, by a radio access network device, a configuration message to a remote device, the configuration message being used to configure a split ratio of an amount of data in a packet data convergence protocol (PDCP) entity sent by the remote device to a plurality of relay devices; and receiving, by the radio access network device, uplink data transmitted by the plurality of relay devices, the uplink data being data sent by the remote device to the radio access network device.

[0060] In the embodiments of the present application, the wireless access network device sends a configuration message of a split ratio of a data quantity in a PDCP entity to the remote device, so that the remote device transmits uplink data to the plurality of relay devices according to the split ratio, thereby adapting uplink transmission of the remote device to uplink conditions between the relay devices and the wireless access network device, and further improving transmission efficiency of the uplink data.

[0061] With reference to the seventh aspect, in a first possible implementation manner of the seventh aspect, the configuration message further comprises first indication information, the first indication information being used to indicate at least two sidelinks between the remote device and the plurality of relay devices, wherein the configuration message is used to configure the remote device to send the split ratio of the data quantity in the PDCP entity to each of the at least two sidelinks.

[0062] With reference to the seventh aspect, in a second possible implementation manner of the seventh aspect, the configuration message further comprises second indication information, the second indication information being used to indicate that one of the plurality of relay devices is a master device, and the rest of the plurality of relay devices are auxiliary devices, wherein the configuration message is used to configure the remote device to send the split ratio of the data quantity in the PDCP entity to the master device and the auxiliary devices respectively.

[0063] With reference to the seventh aspect or any one of the first to second possible implementation manners of the seventh aspect, in a third possible implementation manner of the seventh aspect, the split ratio is applicable to all data radio bearers (DRBs) of the remote device, and the PDCP entity is a PDCP entity of the DRB of the remote device.

[0064] An eighth aspect provides a data transmission apparatus, which has a function of implementing the method provided in the first aspect or any one of the possible implementation manners thereof. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software comprises one or more units corresponding to the above functions.

[0065] A ninth aspect provides a data transmission apparatus, which has a function of implementing the method provided in the second aspect or any one of the possible implementation manners thereof. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software comprises one or more units corresponding to the above functions.

[0066] A tenth aspect provides a data transmission apparatus, which has a function of implementing the method provided in the third aspect or any one of the possible implementation manners thereof. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software comprises one or more units corresponding to the above functions.

[0067] In an eleventh aspect, a data transmission apparatus is provided, which has a function of implementing the method provided in the fourth aspect or any possible implementation manner thereof. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

[0068] In a twelfth aspect, a data transmission apparatus is provided, which has a function of implementing the method provided in the fifth aspect or any possible implementation manner thereof. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

[0069] In a thirteenth aspect, a data transmission apparatus is provided, which has a function of implementing the method provided in the sixth aspect or any possible implementation manner thereof. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

[0070] In a fourteenth aspect, a data transmission apparatus is provided, which has a function of implementing the method provided in the seventh aspect or any possible implementation manner thereof. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

[0071] In a fifteenth aspect, a communication apparatus is provided, which includes a processor configured to execute a computer program stored in a memory, so that the communication apparatus performs the communication method in any one of the first to tenth possible implementation manners of the first aspect, or performs the communication method in any one of the first to third possible implementation manners of the second aspect, or performs the communication method in any one of the first to eleventh possible implementation manners of the third aspect, or performs the communication method in any one of the first to sixth possible implementation manners of the fourth aspect, or performs the communication method in any one of the first to fourth possible implementation manners of the fifth aspect, or performs the communication method in any one of the first to third possible implementation manners of the sixth aspect, or performs the communication method in any one of the first to third possible implementation manners of the seventh aspect.

[0072] In a sixteenth aspect, a computer readable storage medium is provided, having stored thereon a computer program which, when run on a computer, causes the computer to perform the communication method of any one of the first to tenth possible implementation manners of the first aspect, or perform the communication method of any one of the first to third possible implementation manners of the second aspect, or perform the communication method of any one of the first to eleventh possible implementation manners of the third aspect, or perform the communication method of any one of the first to sixth possible implementation manners of the fourth aspect, or perform the communication method of any one of the first to fourth possible implementation manners of the fifth aspect, or perform the communication method of any one of the first to third possible implementation manners of the sixth aspect, or perform the communication method of any one of the first to third possible implementation manners of the seventh aspect.

[0073] In a seventeenth aspect, a chip system is provided, comprising: a processor configured to invoke and run a computer program from a memory, so that a communication device installed with the chip system performs the communication method of any one of the first to tenth possible implementation manners of the first aspect, or performs the communication method of any one of the first to third possible implementation manners of the second aspect, or performs the communication method of any one of the first to eleventh possible implementation manners of the third aspect, or performs the communication method of any one of the first to sixth possible implementation manners of the fourth aspect, or performs the communication method of any one of the first to fourth possible implementation manners of the fifth aspect, or performs the communication method of any one of the first to third possible implementation manners of the sixth aspect, or performs the communication method of any one of the first to third possible implementation manners of the seventh aspect.

[0074] In an eighteenth aspect, a communication system is provided, comprising the communication apparatus of the eighth aspect, the communication apparatus of the ninth aspect and the communication apparatus of the tenth aspect, or the communication apparatus of the eleventh aspect and the communication apparatus of the twelfth aspect, or the communication apparatus of the thirteenth aspect and the communication apparatus of the fourteenth aspect. BRIEF DESCRIPTION OF DRAWINGS

[0075] Figure 1 is a schematic diagram of a scenario provided by an embodiment of the present application;

[0076] Figure 2 is a schematic diagram of another scenario provided by an embodiment of the present application;

[0077] Figure 3 is a schematic diagram of another scenario provided by an embodiment of the present application;

[0078] Figure 4 is a schematic diagram of a possible control plane protocol stack provided by an embodiment of the present application;

[0079] Figure 5 is a schematic diagram of a possible user plane protocol stack provided by embodiments of the application;

[0080] Figure 6 is a schematic flowchart of a data transmission method provided by embodiments of the application;

[0081] Figure 7 is a further schematic flowchart of a data transmission method provided by embodiments of the application;

[0082] Figure 8 is a further schematic flowchart of a data transmission method provided by embodiments of the application;

[0083] Figure 9 is a further schematic flowchart of a data transmission method provided by embodiments of the application;

[0084] Figure 10 is a further schematic flowchart of a data transmission method provided by embodiments of the application;

[0085] Figure 11 is a further schematic flowchart of a data transmission method provided by embodiments of the application;

[0086] Figure 12 is a further schematic flowchart of a data transmission method provided by embodiments of the application;

[0087] Figure 13 is a further schematic flowchart of a data transmission method provided by embodiments of the application;

[0088] Figure 14 is a schematic block diagram of a communication apparatus provided by embodiments of the application;

[0089] Figure 15 is a further schematic block diagram of a communication apparatus provided by embodiments of the application;

[0090] Figure 16 is a further schematic block diagram of a communication apparatus provided by embodiments of the application;

[0091] Figure 17 is a further schematic block diagram of a communication apparatus provided by embodiments of the application;

[0092] Figure 18 is a further schematic block diagram of a communication apparatus provided by embodiments of the application;

[0093] Figure 19 is a further schematic block diagram of a communication apparatus provided by embodiments of the application;

[0094] Figure 20is another schematic block diagram of a communication apparatus provided by an embodiment of the present application.

[0095] Figure 21 is another schematic block diagram of a communication apparatus provided by an embodiment of the present application. DETAILED DESCRIPTION

[0096] The technical solutions in the present application will be described below with reference to the drawings.

[0097] By way of example, in order to facilitate understanding of the embodiments of the present application, the concepts related to the embodiments of the present application will be described below.

[0098] 1. Buffer status report (BSR): If there is data to be transmitted to the opposite end in the buffer of the remote device, the remote device needs to first report the BSR to the radio access network device, and tell the radio access network device the size of the data to be transmitted in the current buffer through the BSR. After receiving the BSR reported by the remote device, the radio access network device determines the size of the data to be transmitted by the remote device according to the BSR, allocates corresponding uplink resources for the remote device, and notifies the remote device to transmit data to the opposite end on the allocated uplink resources.

[0099] 2. Sidelink (SL): The link between user equipment (UE) and UE is called sidelink, and a typical application scenario of sidelink communication is vehicle networking. In vehicle networking, each vehicle can be regarded as a UE, and the UE and the UE can directly transmit data through the sidelink without going through the radio access network device, which can effectively reduce the communication delay. Broadcast, unicast and groupcast are supported on the sidelink.

[0100] 3. Broadcast: Broadcast communication is similar to the radio access network device broadcasting system messages, that is, the UE sends broadcast service data externally without encryption, and any other UE within the effective receiving range can receive the data of the broadcast service if it is interested in the broadcast service.

[0101] 4. Unicast: Unicast communication is similar to the data communication between the UE and the radio access network device after establishing a radio resource control (RRC) connection, and a unicast connection needs to be established between two UEs in advance. After establishing the unicast connection, the two UEs can communicate data based on the negotiated identifier, and the data can be encrypted or unencrypted. Compared with broadcast, only the two UEs that have established a unicast connection can communicate in unicast communication.

[0102] 5. Groupcast: Groupcast communication refers to communication between all UEs in a communication group, and any UE in the group can transmit and receive data of the groupcast service.

[0103] Figure 1 is a communication system architecture diagram provided by an embodiment of the present application, as shown in the figure, the communication system includes at least one wireless access network device 110 (only one wireless access network device is shown in the figure), at least one relay device (only one relay device is shown in the figure) and a remote device 120. Exemplarily, the remote device 120 and the relay device 130 can respectively perform Uu link communication with the wireless access network device 110 through a Uu port; the remote device 220 and the relay device 230 can perform sidelink (SL) communication through a PC5 port. Figure 1 Figure 1 Figure 1

[0104] Generally, when the remote device 120 sends data to the wireless access network device 110, the remote device 120 can send a first buffer status report (BSR) to the wireless access network device 110 to request uplink resource scheduling to obtain uplink resources of Uu, and can also send a second BSR to the wireless access network device 110 to request uplink resource scheduling to obtain sidelink resources. The first BSR and the second BSR are in different media access control (MAC) control elements (CE), but the Uu packet data convergence protocol (PDCP) is common, and the wireless access network device 110 can know how much data the bearer has as long as the first BSR or the second BSR is received, therefore, sending the first BSR and the second BSR can cause excessive scheduling of resources.

[0105] Figure 2 is another communication system architecture diagram provided by an embodiment of the present application, as shown in the figure, the system includes at least one wireless access network device 210 (only one wireless access network device is shown in the figure), multiple relay devices (only relay device 220 and relay device 230 are shown in the figure) and a remote device 240. Exemplarily, the remote device 240 and the relay device 220 perform sidelink communication through a PC5 port, or the remote device 240 and the relay device 230 perform sidelink communication through a PC5 port. The relay device 220 and the wireless access network device 210 perform communication through a Uu port, and similarly, the relay device 230 and the wireless access network device 210 also perform communication through a Uu port. Figure 2 Figure 2 Figure 2 ​​​​​​

[0106] Generally, when the remote device 240 sends data to the wireless access network device 210, there can be two cases. One case is that the remote device 240 can acquire sidelink resources in a mode 2 manner, which means that the remote device 240 monitors the use of sidelink resources, and when it determines that the sidelink resources are available, it can directly occupy the sidelink resources to send data. In the mode 2 manner, the wireless access network device 210 does not need to perform resource scheduling. However, in this case, the decision of the remote device 240 can not match the state of the transmission link between the wireless access network device 210 and the relay device 220 / relay device 230. For example, the remote device 240 decides to transmit more data to the relay device 220, but the link between the relay device 230 and the wireless access network device 210 can carry more data than the link between the relay device 220 and the wireless access network device 210, so this transmission method can cause the uplink transmission performance to be poor.

[0107] Another case is that the PDCP layer in the remote device can perform a duplication operation to copy two identical PDCP packet data units (PDUs), and the remote device 240 can send the two identical PDCP PDUs to the relay device 220 and the relay device 230 through two unicast connections respectively. However, in this case, the remote device sends the same uplink data through two unicast connections, which occupies two resources, resulting in low transmission efficiency.

[0108] Figure 3 FIG. 3 is another communication system architecture diagram provided by an embodiment of the present application, which is a device-to-device relay communication system. In this scenario, the remote device 320 first receives data from the wireless access network device 310 through a Uu link, and then transmits the data to the remote device 350. The remote device 320 and the relay device 330 and the relay device 340 perform sidelink communication through a PC5 interface, and the remote device 350 and the relay device 330 and the relay device 340 also perform sidelink communication through a PC5 interface.

[0109] Exemplarily, the remote device and the relay device are devices with wireless transceiving functions, which can be a vehicle-mounted communication device, a vehicle-mounted communication chip, a road side unit, a communication device in the road side unit, a user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device. The remote device and the relay device can 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 functions, a computing device, or other processing devices 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 public land mobile network (PLMN), and the like, which are not limited in the embodiments of the present application.

[0110] Exemplarily, the wireless access network device can be a device for communicating with the remote device or the relay device, and can be any device with transceiving functions. The wireless access network device can be a device for providing wireless communication services for terminal devices, which is usually located at the network side, and includes but is not limited to a next generation base station (gNodeB, gNB) in a 5th generation (5G) communication system, an evolved node B (eNB) in an LTE system, a radio network controller (RNC), a node B (NB), a device for providing wireless communication services for terminal devices in a V2X communication system, a wireless controller in a cloud radio access network (CRAN) scenario, a relay station, a vehicle-mounted device, a wearable device, and a network device in a future evolved network, and the like, which are not limited in the embodiments of the present application.

[0111] In addition, in the embodiments of the present application, the radio access network device can be a device in the RAN, or in other words, a RAN node that accesses a remote device to a wireless network. For example, by way of example and not limitation, as a base station, the following can be listed: gNB, transmission reception point (TRP), transmitting point (TP), evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved Node B, or home Node B, HNB), baseband unit (BBU), etc. In one network structure, the radio access network device can include a centralized unit (CU) node, or a distributed unit (DU) node, or a RAN device including a CU node and a DU node, or a RAN device including a control plane CU node (CU-CP node) and a user plane CU node (CU-UP node) and a DU node.

[0112] The radio access network device serves a cell through which a terminal device communicates with the base station using transmission resources (e.g., frequency domain resources, or in other words, spectrum resources) used by the cell. The cell can be a cell corresponding to the base station (e.g., a base station), and the cell can belong to a macro base station or a base station corresponding to a small cell. The small cell here can include a metro cell, a micro cell, a pico cell, a femtocell, etc., which have the characteristics of small coverage and low transmit power, and are suitable for providing high-rate data transmission services.

[0113] Exemplarily, the above communication scenario can be applied to various communication systems, for example, a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD), a universal mobile telecommunication system (UMTS), a worldwide interoperability for microwave access (WiMAX) communication system, a 5th generation (5G) system or new radio (NR), or a future evolved wireless communication system, and the like.

[0114] The communication system of the embodiments of the present application can also be applicable to a user equipment to network (U2N) relay technology. In the U2N relay system, network elements include a radio access network device, a relay UE and a remote UE. There is a connection between the radio access network device and the relay UE, and there is a connection between the relay UE and the remote UE. The relay UE can help the remote UE access the network to obtain services. For example, the relay UE can help the remote UE obtain data of the remote UE through the radio access network device and forward the data to the remote UE, or the relay UE obtains the data from the remote UE and forwards the data to the radio access network device.

[0115] The service of the U2N relay can be provided in two ways: a PC5 interface-based way and a Uu interface-based way. The PC5 interface is an interface defined on the basis of a sidelink (SL). Using this interface, communication devices (for example, terminal devices) can directly communicate and transmit. The PC5 interface can be used in out of coverage (OOC) and in coverage (IC), but only authorized communication devices can use the PC5 interface for transmission.

[0116] Figure 4 is a control plane protocol stack diagram in a U2N relay communication system provided by the embodiments of the present application, as shown in Figure 4As shown, the control plane protocol stack of the remote UE includes a non-access stratum (NAS) layer, a PDCP layer and a radio resource control (RRC) layer between a next generation core (NGC), and an SL-RLC layer, an SL-MAC layer and an SL-PHY layer based on a sidelink connection between the relay UE; the control plane protocol stack of the relay UE includes an SL-RLC layer, an SL-MAC layer and an SL-PHY layer based on a sidelink connection between the remote UE, and an RLC layer, a MAC layer and a PHY layer based on a Uu interface connection between the gNB, and an adaptation (Adap.) layer; the control plane protocol stack of the gNB includes an adaptation layer, an RLC layer, a MAC layer and a PHY layer connected through a Uu interface between the relay UE, and a Layer 1 / Layer 2 (L1 / L2) layer, a stream control transmission protocol (SCTP) layer, an Internet protocol (IP) layer and an NG application protocol (NGAP) layer for information interaction between the NGC; the control plane protocol stack of the NGC includes a NAS layer, an RRC layer, a PDCP layer, an L1 / L2 layer, an SCTP layer, an IP layer and an NGAP layer.

[0117] Figure 5 is a user plane protocol stack schematic diagram in a U2N relay communication system provided by an embodiment of the present application, as shown in Figure 5As shown, the user plane protocol stack of the remote UE includes an IP / Non-IP layer with the NGC and an SL-RLC layer, an SL-MAC layer, and an SL-PHY layer based on a sidelink connection with the relay UE; the user plane protocol stack of the relay UE includes an SL-RLC layer, an SL-MAC layer, and an SL-PHY layer based on a sidelink connection with the remote UE and an RLC layer, a MAC layer, a PHY layer, and an adaptation layer based on a Uu interface connection with the gNB; the user plane protocol stack of the gNB includes an adaptation layer, an RLC layer, a MAC layer, and a PHY layer based on a Uu interface connection with the relay UE and an L1 / L2 layer, a user datagram protocol (UDP) layer, an IP layer, and a general packet radio service tunneling protocol user plane (GTP-U) layer for information interaction with the NGC; and the user plane protocol stack of the NGC includes an L1 / L2 layer, a UDP layer, an IP layer, a GTP-U layer, and an IP / Non-IP layer. The SL-RLC layer, the SL-MAC layer, and the SL-PHY layer of the remote UE and the SL-RLC layer, the SL-MAC layer, and the SL-PHY layer of the relay UE exchange information through a PC5 interface, the PDCP layer of the remote UE and the gNB exchange information through an end-to-end connection established through a Uu interface, and the RLC layer, the MAC layer, and the PHY layer of the relay UE and the RLC layer, the MAC layer, and the PHY layer of the gNB exchange information through a Uu interface.

[0118] It should be understood that in the protocol stacks of the remote UE and the relay UE, Figure 4 and Figure 5 there can also be a peer adaptation layer between the remote UE and the relay UE, that is, there can be an adaptation layer above the peer SL-RLC layer of the remote UE and the relay UE, respectively.

[0119] Figure 6 is a schematic diagram of a data transmission method provided by an embodiment of the present application. It should be understood that the application scenario can be Figure 2 , that is, there is a non-direct link between the remote device and the wireless access network device, and at least one relay device is included in the application scenario. As Figure 6 shown, the method specifically includes:

[0120] S610, the remote device determines a sidelink groupcast identifier, the sidelink groupcast identifier being used to identify a groupcast between the remote device and a plurality of relay devices;

[0121] S620, the remote device sends the uplink data to the plurality of relay devices in a multicast manner based on the sidelink groupcast identifier, the uplink data being data sent by the remote device to the radio access network device.

[0122] For example, when the remote device sends the uplink data to the radio access network device in a multicast manner, a sidelink groupcast needs to be created first, which is used for transmission of the uplink data between the remote device and the plurality of relay devices, and a sidelink groupcast identifier is allocated to the sidelink groupcast. Generally, the radio access network device can instruct the remote device to create the sidelink groupcast. For example, the radio access network device configures more than one relay device for the remote device, and can instruct the remote device to transmit the uplink data in a sidelink groupcast manner, or when the current service is a high-reliability and low-latency service, the radio access network device can also instruct the remote device to transmit the uplink data in a sidelink groupcast manner. The sidelink groupcast can also be created by the remote device itself. For example, when the uplink data transmission service on the Uu link of the remote device has a relatively high reliability requirement, and the current unicast communication manner cannot meet the service requirement, the remote device can determine to initiate sidelink groupcast communication, and transmit the uplink data in a sidelink groupcast manner. That is, when the remote device triggers establishment of the sidelink groupcast, it is generally triggered by the internal or access stratum (AS) based on the quality of service (QoS) of the service data, that is, the current transmission mechanism cannot meet the QoS requirement of the current service.

[0123] For example, when the remote device creates the sidelink groupcast, a sidelink groupcast identifier can be allocated to the sidelink groupcast. That is, the AS of the remote device sends indication information to the upper layer, the indication information being used to instruct the upper layer to allocate the sidelink groupcast identifier. After the upper layer allocates the sidelink groupcast identifier, the AS is further instructed, and at this time, the allocation of the sidelink groupcast identifier is completed.

[0124] As an optional solution, the sidelink groupcast identifier can also be allocated by the AS itself. That is, when the remote device transmits the uplink data based on the sidelink groupcast communication, the AS also has the function of managing the sidelink groupcast identifier. Furthermore, after the AS allocates the sidelink groupcast identifier, the allocated sidelink groupcast identifier can also be indicated to the upper layer.

[0125] Optionally, the upper layer of the AS can be a vehicle-to-everything (V2X) layer or a PC5-S layer.

[0126] Optionally, the sidelink groupcast identifier can be an L2 identifier.

[0127] It should be understood that the indication of the remote device creating the sidelink groupcast by the wireless access network device can be that the wireless access network device directly sends indication information to the remote device, instructing the remote device to create the groupcast, or that the wireless access network device directly sends a configuration message to the remote device, and when the remote device receives the configuration message, it knows that it needs to create the sidelink groupcast.

[0128] It should be understood that the sidelink groupcast created by the remote device described above can also be understood as the remote device allocating a sidelink groupcast identifier, or the remote device sending uplink data to the relay device in the form of a sidelink groupcast.

[0129] Optionally, the configuration message is generally an RRC reconfiguration message, and the configuration message carries a sidelink bearer configuration, which is used to configure the sidelink groupcast bearer between the remote device and the plurality of relay devices.

[0130] For example, when the remote device receives the configuration message, it can establish the sidelink groupcast bearer between the remote device and the plurality of relay devices according to the information in the sidelink bearer configuration carried in the configuration message.

[0131] It should be understood that the information in the sidelink bearer configuration includes sidelink bearer indication information, which is used to indicate the sidelink groupcast bearer, and in addition, the sidelink bearer configuration can also include SL-RLC entity configuration, logical channel configuration, etc.

[0132] It should be understood that the sidelink bearer indication information can directly contain information of the sidelink groupcast bearer, or the function of the sidelink bearer indication information or the information carried thereby can directly or indirectly represent / identify the sidelink groupcast bearer. As long as the sidelink bearer indication information can represent that the sidelink groupcast bearer belongs to the protection scope of the embodiments of the present application, it is not limited here.

[0133] Optionally, the sidelink groupcast bearer indication information can also be a logical channel identifier, such as an LCID, or a PC5 bearer indication information, or a sidelink configuration bearer index.

[0134] Optionally, the configuration message can also include a Uu bearer identifier (hereinafter referred to as a first Uu bearer identifier), wherein the Uu bearer identifier is used to identify a data radio bearer (DRB) (hereinafter referred to as a first DRB) between the remote device and the wireless access network device, and the sidelink bearer indication information and the first Uu bearer identifier have a corresponding relationship, that is, the sidelink groupcast bearer has a corresponding relationship with the first DRB.

[0135] It should be understood that the correspondence between the sidelink bearer indication information and the first Uu bearer identifier in the embodiments of the present application can be a one-to-one correspondence, that is, one sidelink bearer indication information corresponds to one first Uu bearer identifier, that is, one sidelink multicast bearer corresponds to one first DRB; or multiple first Uu bearer identifiers correspond to one sidelink bearer indication information, that is, multiple first DRBs correspond to one sidelink multicast bearer.

[0136] It should be understood that when one sidelink multicast bearer corresponds to multiple first DRBs, at this time, the adaptation layer of the remote device can carry the first DRB identifier, so as to let the relay device know which first DRB to send through the sidelink multicast bearer when transmitting data.

[0137] It should be understood that the sidelink multicast bearer is a sidelink bearer for the remote device to send uplink data to the relay device in a multicast manner, that is, SL-RLC, SL-MAC and SL-PHY, which is usually referred to as SL RLC bearer.

[0138] It should be understood that when the wireless access network device directly sends the indication information to the remote device or the remote device creates the multicast by itself, the wireless access network device also needs to send a configuration message to the remote device, but at this time, the remote device can first send a sidelink multicast identifier to the wireless access network device, that is, the remote device sends a second message to the wireless access network device, and the second message carries the sidelink multicast identifier, that is, after the wireless access network device receives the sidelink multicast identifier, it will trigger it to send a configuration message to the remote device.

[0139] Optionally, the indication information sent by the wireless access network device to the remote device can be a Uu RRC message, and the Uu RRC message can also be an RRC reconfiguration message.

[0140] When the remote device receives the configuration message, it can associate the sidelink multicast bearer and the first DRB according to the sidelink bearer configuration and the first Uu bearer identifier in the configuration, so when the remote device needs to transmit uplink data to the wireless access network device in a sidelink multicast manner, it can know which sidelink multicast bearer to send the data in the PDCP entity of the first DRB bearer, so as to realize efficient and accurate transmission of data.

[0141] After the remote device creates a sidelink multicast and allocates an identifier to the sidelink multicast, the sidelink multicast identifier needs to be sent to each relay device, so that the relay device can receive data from the multicast corresponding to the sidelink multicast identifier based on the sidelink multicast identifier.

[0142] It should be understood that the sidelink groupcast identifier can be transmitted by the remote device to the relay device, i.e., the remote device transmits a first message to the relay device, and the sidelink groupcast identifier is carried in the first message; or the sidelink groupcast identifier can be transmitted by the wireless access network device to the relay device, i.e., the wireless access network device receives the sidelink groupcast identifier from the remote device, and then the wireless access network device transmits a first message to the relay device, and the sidelink groupcast identifier is carried in the first message.

[0143] For example, in the embodiment of the present application, the unicast connection between the remote device and the relay device and between the relay device and the wireless access network device has been established in advance, so when the remote device transmits the sidelink groupcast identifier to the relay device, the sidelink groupcast identifier can be transmitted through the sidelink unicast connection that has been established between the remote device and the relay device.

[0144] Generally, the first message can carry sidelink bearer indication information and a Uu bearer identifier (hereinafter referred to as a first Uu bearer identifier), and similarly, the first Uu bearer identifier is used to identify a DRB (hereinafter referred to as a first DRB) between the remote device and the wireless access network device, and the sidelink bearer indication information is used to indicate a sidelink groupcast bearer, which has a corresponding relationship with the first DRB. The reason for this is to enable the relay device to know which sidelink groupcast bearer receives the uplink data transmitted by the remote device, and to transmit the data through which second DRB of the relay device to the wireless access network device. It should be noted that the second DRB here is the DRB between the relay device and the wireless access network device, and in order to distinguish the DRB of the relay device from the DRB of the remote device, “first DRB” will be used below to represent the DRB between the remote device and the wireless access network device, and “second DRB” will be used to represent the DRB between the relay device and the wireless access network device.

[0145] It should be understood that in the embodiments of the present application, if not specifically stated, the words “first”, “second”, etc. are only used to distinguish different individuals, for example, the “first Uu bearer identifier” and the “second Uu bearer identifier” involved in the embodiments of the present application are the identifiers of two mutually independent or different Uu bearers, and there is no other limitation.

[0146] Specifically, there is a sidelink unicast bearer between the remote device and the relay device, and the sidelink unicast bearer can be used for communication between the remote device and the relay device, at this time, the remote device sends the sidelink unicast bearer indication information and the sidelink groupcast bearer indication information to the relay device, or sends the sidelink groupcast bearer indication information and the first DRB identifier of the remote device, so that the relay device corresponds the sidelink unicast bearer indication information / first DRB identifier to the second DRB identifier of the relay device. Therefore, when the relay device receives the uplink data sent by the remote device from the sidelink groupcast bearer, it knows which DRB to use to send to the radio access network device.

[0147] It should be understood that the sidelink unicast bearer indication information can directly include the information of the sidelink unicast bearer, or the function of the sidelink unicast bearer indication information or the information carried thereby can directly or indirectly represent / identify the sidelink unicast bearer. As long as the sidelink unicast bearer indication information can represent the sidelink unicast bearer, it is within the protection scope of the embodiments of the present application, and will not be limited here.

[0148] Optionally, when there is no information based on sidelink unicast communication between the remote device and the relay device, at this time, when the relay device receives the correspondence between the sidelink groupcast bearer indication information and the first Uu bearer identifier from the remote device, the relay device also receives the correspondence between the first DRB identifier and the second DRB identifier from the radio access network device. Therefore, when the relay device receives the uplink data sent by the remote device from the sidelink groupcast bearer, it knows which second DRB to use to send to the radio access network device.

[0149] It should be understood that when the sidelink groupcast identifier is sent by the radio access network device to the relay device, the remote device will first send the sidelink groupcast identifier to the radio access network device. That is, the remote device sends a second message to the radio access network device, and the second message carries the sidelink groupcast identifier, and the sidelink groupcast identifier corresponds to a groupcast used for the remote device to transmit uplink data.

[0150] Optionally, the second message can carry indication information, i.e., second indication information, which is used to indicate that the sidelink groupcast identifier corresponds to a groupcast used for the remote device to transmit uplink data.

[0151] Optionally, the second message can be a Uu RRC message, i.e., the message is an RRC message between the remote device and the radio access network device, and the Uu RRC message can also be a sidelink UE information NR (SidelinkUEInformationNR) message.

[0152] It should be understood that when the sidelink groupcast identifier is sent by the remote device to the relay device, there can also be a possible implementation manner that after the relay device receives the groupcast identifier, the relay device can send the sidelink groupcast identifier to the wireless access network device, that is, the relay device generates a third message and sends the third message to the wireless access network device, the third message carries the sidelink groupcast identifier, and the sidelink groupcast identifier corresponds to a groupcast used for the remote device to transmit uplink data. After the wireless access network device receives the sidelink groupcast identifier, the wireless access network device can also send a configuration message to the relay device, and the configuration message includes sidelink bearer configuration and a second Uu bearer identifier, wherein the sidelink bearer configuration includes sidelink bearer indication information, and the sidelink bearer indication information is used to indicate a sidelink groupcast bearer. In addition, the sidelink bearer configuration can also include SL-RLC entity configuration, logical channel configuration, etc.

[0153] The second Uu bearer identifier is used to identify a second DRB between the relay device and the wireless access network device, and the second Uu bearer identifier has a corresponding relationship with the sidelink bearer indication information, that is, the sidelink groupcast bearer has a corresponding relationship with the second DRB.

[0154] It should be understood that the corresponding relationship between the sidelink bearer indication information and the second Uu bearer identifier in the embodiments of the present application can be a one-to-one correspondence, that is, one sidelink bearer indication information corresponds to one second Uu bearer identifier, that is, one sidelink groupcast bearer corresponds to one second DRB; or one second Uu bearer identifier can correspond to multiple sidelink bearer indication information, that is, one second DRB corresponds to multiple sidelink groupcast bearers; or multiple second Uu bearer identifiers can correspond to one sidelink bearer indication information, that is, multiple second DRBs correspond to one sidelink groupcast bearer.

[0155] It should be understood that when multiple sidelink groupcast bearers correspond to one second DRB or one sidelink groupcast bearer corresponds to multiple second DRBs are supported, at this time, the adaptation layer between the relay device and the wireless access network device can carry the first DRB identifier, so that the wireless access network device knows which first DRB to send through the sidelink groupcast bearer when transmitting data.

[0156] Optionally, the third message can carry indication information, that is, second indication information, and the indication information is used to indicate that the groupcast determined by the sidelink groupcast identifier is used for the remote device to transmit uplink data.

[0157] Optionally, the third message can be a Uu RRC message, that is, the message is an RRC message between the relay device and the wireless access network device, for example, the Uu RRC message can also be a SidelinkUEInformationNR message.

[0158] The second message and the third message can additionally carry second indication information indicating that the sidelink groupcast identification is determined for the remote device to transmit uplink data, because:

[0159] In the existing mechanism, the remote device reports the multicast, unicast or unicast corresponding identification to the radio access network device through the RRC uplink message, but in the embodiment of the present application, the existing mechanism can be reused, that is, the existing SidelinkUEInformationNR message is reused, but the problem is that the radio access network device cannot distinguish whether the sidelink groupcast identification is established by the remote device or the V2X layer after receiving the sidelink groupcast identification. At this time, an additional indication information can be carried in the existing information element of the reused SidelinkUEInformationNR message, or a new information element indicating the sidelink groupcast identification is introduced in the existing SidelinkUEInformationNR message to indicate that the sidelink groupcast is the groupcast used by the remote device to transmit uplink data.

[0160] Alternatively, the existing mechanism can not be reused, and a new message needs to be introduced at this time. This message is used to report the sidelink groupcast identification. After receiving the message, the radio access network device knows that the sidelink groupcast is the groupcast used by the remote device to transmit uplink data.

[0161] When the remote device determines the sidelink groupcast identification and sends the sidelink groupcast identification to the relay device and the radio access network device, and the remote device receives the sidelink bearer configuration sent by the radio access network device, the remote device can send uplink data to the radio access network device through multiple relay devices in a multicast manner based on the sidelink groupcast identification, thereby realizing high-reliability and high-transmission-efficiency uplink data transmission.

[0162] When there are both unicast connection bearers and sidelink groupcast bearers between the remote device and the relay device in the communication system, and both have a corresponding relationship with the first DRB of the remote device, at this time, the transmission mode between the remote device and the multiple relay devices can be switched from groupcast communication to unicast communication, or from unicast communication to groupcast communication. For example, the current transmission mode between the remote device and the multiple relay devices is unicast communication, but the business requirement becomes high reliability, at this time, it needs to be switched from unicast communication to groupcast communication; or the current transmission mode is groupcast communication, and the business requirement does not emphasize reliability, or different data needs to be transmitted, it can be switched from groupcast to unicast; or based on the change of the communication environment, for example, when the sidelink condition becomes poor, it can be switched from unicast to groupcast, and when the sidelink condition becomes good, it can be switched from groupcast to unicast.

[0163] Optionally, the remote device can switch from multicast to unicast or from unicast to multicast by itself based on its own service requirements or based on the judgment of the sidelink status.

[0164] Optionally, the remote device can receive indication information, i.e., third indication information, from the radio access network device, which is used to indicate that the transmission mode between the remote device and the plurality of relay devices can be switched from multicast communication to unicast communication or from unicast communication to multicast communication.

[0165] Optionally, the third indication information can be a Uu RRC message, or the radio access network device can send a Uu MAC CE to the relay device, and then the relay device generates a PC5 MAC CE and sends it to the remote device.

[0166] When the remote device simultaneously retains the sidelink unicast bearer and the sidelink multicast bearer, the radio access network device can flexibly adjust the transmission mode of the uplink data by sending indication information to the remote device.

[0167] The following will be combined with Figures 7 to 11 The uplink transmission method of the embodiment of the present application is exemplarily explained.

[0168] Figure 7 is a schematic flow chart of a data transmission method provided by the embodiment of the present application, as Figure 7 shown, the method includes a remote UE#1, a relay UE#2, a relay UE#3 and a base station gNB. It should be understood that in Figure 7 , the remote UE#1 is a remote device, the plurality of relay devices are two, which are the relay UE#2 and the relay UE#3, and the radio access network device is gNB.

[0169] It should be understood that the application scenario can be Figure 2 , i.e. Figure 2 the radio access network device 210 in the above Figure 7 , the remote device 240 is the remote UE#2, the relay device 320 is the relay UE#2, and the relay device 330 is the relay UE#3.

[0170] S701, the remote UE#1 receives the RRC reconfiguration message sent by the gNB;

[0171] S702, the remote UE#1 sends the RRC reconfiguration completion message to the gNB.

[0172] Specifically, after the remote UE #1 establishes unicast connections with the relay UE #2 and the relay UE #3 respectively, in order to realize the multicast communication between the remote UE #1 and the relay UE #2 and the relay UE #3, the gNB sends an RRC reconfiguration message (that is, a configuration message) to the remote UE #1. In other words, the gNB decides that the remote UE #1 sends uplink data to the relay UE #2 and the relay UE #3 in the form of sidelink multicast. The RRC reconfiguration message carries a sidelink bearer configuration, and the information in the sidelink multicast bearer configuration is used to configure the sidelink multicast bearer of the remote UE #1 to send uplink data to the relay UE #1 and the relay UE #2. When the remote UE #1 receives the sidelink multicast bearer configuration sent by the gNB, the remote UE #1 can send an RRC reconfiguration completion message to the gNB, and the RRC reconfiguration completion message is used to inform the gNB that the remote UE #1 has received the sidelink multicast bearer configuration.

[0173] It should be understood that the embodiments of the present application are used for uplink data transmission in the scenario of Figure 2 , that is, there are only multiple non-direct links between the gNB and the remote UE #2. At this time, when the gNB needs to send a message to the remote UE #1, because there is no Uu link, the gNB needs to relay the message by the relay UE, that is, the gNB needs to relay the message by the relay UE #1 or the relay UE #2. The specific implementation manner can refer to the protocol stack as shown in Figure 4 , that is, the RRC reconfiguration message of the gNB passes through the PDCP and the adaptation layer, and then passes through the RLC layer, the MAC layer and the PHY layer downward, and then the message is forwarded to the Uu interface of the relay UE through the Uu interface. After the Uu interface of the relay UE receives the message, the Uu interface of the relay UE forwards the message to the PC5 port, and the message is transmitted to the remote UE #1 through the PC5 port.

[0174] It should be understood that in the embodiments of the present application, the RRC reconfiguration message is first sent to the relay UE #2 by the gNB, and then the message is forwarded to the remote UE #1 by the relay UE #2. Similarly, the remote UE #1 forwards the RRC reconfiguration completion message to the relay UE #2, and then the message is transmitted to the gNB by the relay UE #2.

[0175] Alternatively, the RRC reconfiguration message can also be first sent to the relay UE #3 by the gNB, and then the message is forwarded to the remote UE #1 by the relay UE #3. Similarly, the remote UE #1 forwards the RRC reconfiguration completion message to the relay UE #3, and then the message is transmitted to the gNB by the relay UE #3.

[0176] Optionally, the gNB can also indicate when the remote UE#1 sends the RRC reconfiguration complete message, i.e., the gNB indicates which relay UE forwards the message, or it can be pre-configured, i.e., the remote UE#1 receives the RRC reconfiguration message from which relay UE, and then forwards the RRC reconfiguration complete message from which relay UE, without too many limitations here.

[0177] Optionally, the RRC reconfiguration message can also carry indication information, which explicitly indicates that the sidelink bearer configuration is for groupcast communication between the remote UE#1 and the relay UE#2 and the relay UE#3.

[0178] It should be understood that the RRC reconfiguration message contains the sidelink bearer configuration and can also contain the indication information. That is, when the RRC reconfiguration message contains the sidelink bearer configuration and does not contain the indication information, when the remote UE#1 receives the sidelink bearer configuration, it knows that it needs to send uplink data to the relay UE in the form of groupcast communication. When the RRC reconfiguration message contains both the sidelink bearer configuration and the indication information, the remote UE#1 can directly know from the indication information that it needs to send uplink data to the relay UE in the form of groupcast communication.

[0179] Optionally, the indication information can be a Uu RRC message, which can also be an RRC reconfiguration message.

[0180] It should be understood that the sidelink bearer configuration can include sidelink bearer indication information, which is used to indicate a sidelink groupcast bearer. The RRC reconfiguration message can also carry a Uu bearer identifier, wherein the Uu bearer identifier is used to identify a first DRB between the remote device and the wireless access network device, and the sidelink groupcast bearer and the first DRB have a corresponding relationship. It should be understood that the sidelink groupcast bearer can also be understood as a PC5 bearer.

[0181] Exemplarily, the uplink data transmitted by the first DRB of the remote UE#1 needs to be forwarded to the relay UE by its corresponding sidelink RLC bearer, and at this time the corresponding relationship between the first DRB and the sidelink RLC bearer is the above-mentioned corresponding relationship.

[0182] Optionally, the Uu bearer identifier can be a data radio bearer (DRB) identifier.

[0183] Optionally, the above mapping relationship can also be implemented through an adaptation layer, such as a backhaul adaptation protocol (BAP) layer.

[0184] Optionally, the sidelink groupcast bearer indication information can also be a logical channel identifier, for example, LCID, a PC5 bearer indication information, or a sidelink configuration bearer index.

[0185] S703, the remote UE#1 determines a sidelink groupcast identifier.

[0186] Specifically, after receiving the RRC reconfiguration message, the remote UE#1 knows that it needs to transmit uplink data to the gNB in a groupcast communication manner. At this time, the AS of the remote UE#1 creates a sidelink groupcast, and then the upper layer of the AS allocates a sidelink groupcast identifier for the groupcast communication. That is, the AS of the remote UE#1 can send indication information to the upper layer, and the indication information is used to instruct the upper layer to allocate a sidelink groupcast identifier. After allocating the sidelink groupcast identifier, the upper layer can also send the sidelink groupcast identifier to the AS of the remote UE#1.

[0187] It should be understood that the above-mentioned upper layer can be a V2X layer or a PC5-S layer.

[0188] Optionally, the above-mentioned groupcast identifier can be an L2 identifier.

[0189] It should be noted that step S703 can also be executed before step S702, that is, the execution order of step S702 and step S703 in the embodiments of the present application is not limited.

[0190] S704, the remote UE#1 sends a first message to the relay UE#2;

[0191] S705, the remote UE#1 sends a first message to the relay UE#3.

[0192] For example, after the remote UE#1 allocates the sidelink groupcast identifier, the remote UE#1 sends a first message to the relay UE#2 and the relay UE#3 through the previously established unicast connection, respectively. The first message carries the sidelink groupcast identifier, and the sidelink groupcast identifier corresponds to a groupcast used by the remote UE#1 to transmit uplink data.

[0193] Optionally, the first message further includes sidelink bearer indication information and a first Uu bearer identifier, the first Uu bearer identifier and the sidelink bearer indication information have a corresponding relationship, and the first Uu bearer identifier is used to identify a DRB (hereinafter referred to as a first DRB) between the remote UE#1 and the gNB. That is, after the relay UE#2 or the relay UE#3 receives the Uu PDCP PDU through the sidelink groupcast bearer, it can forward it to the Uu port, and forward the data to the gNB through a DRB (hereinafter referred to as a second DRB) between the relay UE and the gNB, that is, through the second DRB of the relay UE#2 or the relay UE#3 to the PDCP entity of the gNB.

[0194] Optionally, the mapping relationship can also be implemented through an adaptation layer, for example, a BAP layer.

[0195] Optionally, the sidelink groupcast bearer indication information can be a logical channel identifier, for example, an LCID, can also be a PC5 bearer indication information, and can also be a sidelink configuration bearer index.

[0196] Optionally, the first message can be an SL RRC message, that is, an RRC message between the remote UE#1 and the relay UE.

[0197] S706, the remote UE#2 sends a second message to the gNB.

[0198] Optionally, the remote UE#2 can send a second message to the gNB, and the second message also carries a sidelink groupcast identifier corresponding to the groupcast used for the remote UE#1 to transmit uplink data.

[0199] Optionally, the third RRC message can also carry indication information indicating that the groupcast is used for the remote UE#1 to transmit uplink data to the relay UE#2 and the relay UE#3.

[0200] It should be understood that in the embodiments of the present application, the second message is first sent by the remote UE#1 to the relay UE#2, and then forwarded by the relay UE#2 to the gNB.

[0201] Optionally, the second message can also be first sent by the remote UE#1 to the relay UE#3, and then forwarded by the relay UE#3 to the gNB. No further limitation is made herein.

[0202] Optionally, the second message can be a Uu RRC message, that is, an RRC message between the remote UE#1 and the gNB, and the Uu RRC message can also be a SidelinkUEInformationNR message.

[0203] It should be understood that S706 is an optional step, and the gNB has sent a sidelink bearer configuration to the remote UE#1 in S701, which means that when the gNB issues the sidelink bearer configuration, it already knows that the remote UE#1 will transmit uplink data in a groupcast communication manner with the relay UE#2 and the relay UE#3. At this time, the remote UE#1 can report the sidelink groupcast identifier to the gNB, or can not report the sidelink groupcast identifier. However, when the gNB needs to use the sidelink groupcast identifier for other services, the remote UE#1 needs to report the sidelink groupcast identifier to the gNB at this time.

[0204] It should be understood that when S706 exists in the embodiments of the present application, S706 can be executed after S704 and S705, or before them, or simultaneously. Meanwhile, S704 can be executed before S705, or after them, or simultaneously. That is, the order of execution of the three steps S704, S705 and S706 is not limited.

[0205] In the embodiments of the present application, the remote UE#1 receives the gNB indication of the allocated sidelink groupcast identifier, and sends the sidelink groupcast identifier to each relay UE respectively, so that when the remote UE sends uplink data with the sidelink groupcast identifier, the relay UE can receive the data in the corresponding groupcast according to the sidelink groupcast identifier received in advance, and forward it to the gNB, thereby improving the transmission efficiency of the uplink data.

[0206] Figure 8 is a schematic flow chart of a data transmission method provided by the embodiments of the present application, as shown in Figure 8 , the method comprises a remote UE#1, a relay UE#2, a relay UE#3 and a base station gNB. It should be understood that in Figure 8 , the remote UE#1 is a remote device, the plurality of relay devices are two, which are a relay UE#2 and a relay UE#3, and the wireless access network is a device gNB.

[0207] It should be understood that the application scenario can be Figure 2 , that is Figure 2 , the wireless access network device 210 in the above is a gNB, the remote device 240 is a remote UE#2, the relay device 220 is a relay UE#2, and the relay device 230 is a relay UE#3. Figure 8 The specific method comprises:

[0208] S801, the remote UE#1 receives the RRC reconfiguration message sent by the gNB;

[0209] S802, the remote UE#1 sends an RRC reconfiguration completion message to the gNB;

[0210] S803, the remote UE#1 determines a sidelink groupcast identifier;

[0211] S804, the remote UE#1 sends a first message to the relay UE#2;

[0212] S805, the remote UE#1 sends a first message to the relay UE#3.

[0213] Exemplarily, the specific implementation mode of steps S801 to S805 can be referred to the above steps S701 to S705, which will not be described here.

[0214] S806, the relay UE#2 sends a third message to the gNB;

[0215] S807, the relay UE#2 receives the first RRC reconfiguration message sent by the gNB;

[0216] S808, the relay UE#2 sends a first RRC reconfiguration complete message to the gNB;

[0217] S809, the relay UE#3 sends a third message to the gNB;

[0218] S810, the relay UE#3 receives the second RRC reconfiguration message sent by the gNB;

[0219] S811, the relay UE#3 sends a second RRC reconfiguration complete message to the gNB.

[0220] For example, in the above steps S804 and S805, each relay device receives the sidelink groupcast identifier sent by the remote UE#1, at this time, the relay device knows that the remote UE#1 needs to make groupcast communication subsequently, therefore, the relay device takes the sidelink groupcast identifier as its own service information, generates a third message, and sends it to the gNB. That is, the relay UE#2 sends a third message to the gNB, the relay UE#3 sends a third message to the gNB, and the third message carries the sidelink groupcast identifier, and the sidelink groupcast identifier corresponds to the groupcast used for the remote UE#1 to transmit uplink data.

[0221] Optionally, the third message can be a Uu RRC message, that is, the message is an RRC message between the relay UE and the gNB, and the Uu RRC message can also be a SidelinkUEInformationNR message.

[0222] Optionally, the third message can also carry second indication information, and the indication information is used to indicate that the sidelink groupcast identifier corresponds to the groupcast used for the remote device to transmit uplink data.

[0223] When the gNB receives the message carrying the sidelink groupcast identity sent by the relay device, the gNB can send an RRC reconfiguration message to each relay device respectively, that is, the gNB sends a first RRC reconfiguration message (that is, a configuration message) to the relay UE#2, and the gNB sends a second RRC reconfiguration message (that is, a configuration message) to the relay UE#3. The first RRC reconfiguration message and the second RRC reconfiguration message carry the sidelink bearer configuration and the Uu bearer identity (that is, the second Uu bearer identity), wherein the second Uu bearer identity is used to identify the second DRB between the relay device and the gNB, and the sidelink bearer configuration includes sidelink bearer indication information used to indicate the sidelink groupcast bearer having a mapping relationship with the second DRB. The gNB needs to provide the bearer configuration for each relay device, because the remote UE#1 transmits data by using the Uu link of the relay device for communication, so for the relay device, the uplink data sent by the remote UE#1 can be received from the sidelink bearer between the remote UE#1 and the relay device first, and then needs to be mapped to the second DRB of the relay device itself for data forwarding. Therefore, each relay device needs to know which data in the sidelink bearer from which needs to be forwarded through which DRB of its own.

[0224] It should be understood that the execution order of the above steps S804 and S805 is not limited, and the order of S806 and S809 is also not limited, and the execution order of steps S802 and S803 is also not limited. That is, when there are multiple relay devices, the remote device sends the sidelink groupcast identity to each relay device without any limitation, and similarly, each relay device sends the sidelink groupcast identity to the wireless access network device without any limitation.

[0225] In the embodiment of the application, the remote UE#1 receives the indication of the gNB to assign the sidelink groupcast identity, and sends the sidelink groupcast identity to each relay UE respectively, so when the remote UE sends uplink data with the sidelink groupcast identity, the relay UE can receive the data in the corresponding groupcast according to the sidelink groupcast identity received first, and forward it to the gNB, thereby improving the transmission efficiency of the uplink data.

[0226] Figure 9 is a schematic flowchart of another data transmission method provided by the embodiment of the application, as shown in Figure 9 , the method includes a remote UE#1, a relay UE#2, a relay UE#3, and a base station gNB. It should be understood that in Figure 9 , the remote UE#1 is a remote device, the multiple relay devices are two, which are the relay UE#2 and the relay UE#3, and the wireless access network device is the gNB.

[0227] It should be understood that the application scenario can be Figure 2 That is Figure 2 The wireless access network device 210 in the above formula is a gNB, the remote device 240 is a remote UE#1, the relay device 220 is a relay UE#2, and the relay device 230 is a relay UE#3. Figure 9 The specific method includes the following steps:

[0228] S901, the remote UE#1 receives the RRC reconfiguration message sent by the gNB;

[0229] S902, the remote UE#1 sends an RRC reconfiguration completion message to the gNB;

[0230] S903, the remote UE#1 determines the sidelink groupcast identifier.

[0231] Exemplarily, the specific implementation of steps S901 to S903 can refer to steps S701 to S703 described above, and details are not repeated here.

[0232] S904, the remote UE#1 sends a second message to the gNB;

[0233] S905, the gNB sends a first message to the relay UE#2;

[0234] S906, the gNB sends a first message to the relay UE#2.

[0235] Exemplarily, the remote UE#1 sends a second message to the gNB, and the second message carries the sidelink groupcast identifier, which corresponds to the groupcast used for the remote UE#1 to transmit uplink data.

[0236] Optionally, the second RRC message can also carry indication information, which is used to indicate that the sidelink groupcast is used for the remote UE#1 and the relay UE#2 and the relay UE#3 to transmit uplink data.

[0237] It should be understood that in the embodiment of the present application, the second message is first sent by the remote UE#1 to the relay UE#2, and then forwarded by the relay UE#2 to the gNB.

[0238] Optionally, the second message can also be first sent by the remote UE#1 to the relay UE#3, and then forwarded by the relay UE#3 to the gNB, which is not limited here.

[0239] Optionally, the second message can be a Uu RRC message, that is, an RRC message between the remote UE#1 and the gNB, and the Uu RRC message can also be a SidelinkUEInformationNR message.

[0240] When the gNB receives the sidelink groupcast identity, the gNB can send a first message to the relay UE#2 and the relay UE#3 respectively, and the first message carries the sidelink groupcast identity corresponding to the groupcast used by the remote UE#1 to transmit the uplink data. In other words, at this time, the relay UE#2 and the relay UE#3 obtain the sidelink groupcast identity from the gNB.

[0241] Optionally, the first message further includes sidelink groupcast bearer indication information and a first Uu bearer identity, the first Uu bearer identity and the sidelink groupcast bearer indication information have a corresponding relationship, and the first Uu bearer identity is used to identify the first DRB between the remote UE#1 and the gNB. That is, after the relay UE#2 or the relay UE#3 receives the UuPDCP PDU through the sidelink bearer, it can transmit the uplink data to the gNB through the second DRB between the relay UE and the gNB by forwarding to the Uu port, that is, forwarding to the PDCP entity of the gNB through the second DRB of the relay UE#2 or the relay UE#3.

[0242] Optionally, the above mapping relationship can also be implemented through an adaptation layer, for example, a BAP layer.

[0243] Optionally, the sidelink groupcast bearer indication information can be a logical channel identity, for example, an LCID, or a PC5 bearer indication information, or a sidelink configuration bearer index.

[0244] Optionally, the first message can be a Uu RRC message, that is, an RRC message sent by the gNB to the relay UE, and the Uu RRC message can also be an RRC reconfiguration message.

[0245] It should be understood that after the relay UE receives the first message sent by the gNB, the relay UE can send a response message to the gNB, and the response message can be an RRC reconfiguration completion message.

[0246] In the embodiments of the present application, the remote UE#1 receives the indication of the gNB to allocate the sidelink groupcast identity, and sends the sidelink groupcast identity to the gNB, and the gNB sends the sidelink groupcast identity to each relay UE, so when the remote UE sends uplink data using the sidelink groupcast identity, the relay UE can receive data in the corresponding groupcast according to the sidelink groupcast identity received in advance, and forward it to the gNB, thereby improving the transmission efficiency of the uplink data.

[0247] Figure 10 is a schematic flow chart of another data transmission method provided by the embodiments of the present application, as shown in Figure 10 The method 1000 includes a remote UE#1, a relay UE#2, a relay UE#3 and a base station gNB. It should be understood that in the Figure 10In the figure, remote UE#1 is a remote device, there are two relay devices, namely relay UE#2 and relay UE#3, and the wireless access network device is a gNB.

[0248] It should be understood that its application scenarios can be Figure 2 ,Right now Figure 2 The wireless access network device 210 is a gNB, the remote device 240 is a remote UE#2, the relay device 220 is a relay UE#2, and the relay device 230 is a relay UE#3. Figure 10 Specific methods include:

[0249] S1001, remote UE#1 determines a sidelink multicast identifier.

[0250] For example, when unicast transmission cannot meet the current service needs of remote UE#1, it can initiate a multicast itself. Alternatively, remote UE#1 can receive an indication from the gNB, instructing it to allocate a sidelink multicast identifier. In this case, the AS of remote UE#1 creates a sidelink multicast, and the AS's upper layer then allocates a sidelink multicast identifier for the multicast communication. Specifically, the AS of remote UE#1 can send an indication to the upper layer, instructing the upper layer to allocate a sidelink multicast identifier. After the upper layer allocates the sidelink multicast identifier, it can also send the sidelink multicast identifier to the AS of remote UE#1. In other words, the allocation of the sidelink multicast identifier by remote UE#1 can be initiated by the remote UE#1 itself or triggered by a base station indication.

[0251] It should be understood that the upper layer mentioned above may be a V2X layer or a PC5-S layer.

[0252] Optionally, the sidelink multicast identifier may be an L2 identifier.

[0253] S1002: Remote UE#1 sends a second message to the gNB.

[0254] S1003: Remote UE#1 receives an RRC reconfiguration message sent by the gNB.

[0255] S1004: Remote UE#1 sends an RRC reconfiguration complete message to the gNB.

[0256] Exemplarily, after the remote UE#1 is allocated a sidelink multicast identifier, the remote UE#1 may send a second message to the gNB, where the second message carries the sidelink multicast identifier, and the multicast corresponding to the sidelink multicast identifier is used for the remote UE#1 to transmit uplink data.

[0257] Optionally, the second message may further carry indication information, where the indication information is used to indicate that the multicast is used for uplink data transmission between the remote UE#1 and the relay UE#2 and the relay UE#3.

[0258] It should be understood that in this embodiment of the present application, the second message is first sent by remote UE#1 to relay UE#2, and then relay UE#2 forwards the message to the gNB.

[0259] Optionally, the second message may be first sent by remote UE#1 to relay UE#3, which may then forward the message to the gNB. No further restrictions are imposed here.

[0260] Optionally, the second message may be a Uu RRC message, i.e., an RRC message between the remote UE#1 and the gNB, and the Uu RRC message may also be a SidelinkUEInformationNR message.

[0261] After receiving the sidelink multicast identifier, the gNB can allocate a sidelink bearer configuration for remote UE#1. In this case, the gNB sends an RRC reconfiguration message (i.e., a configuration message) to remote UE#1. The RRC reconfiguration message carries the sidelink bearer configuration, which is used to configure a sidelink multicast bearer between remote UE#1 and relay UE#1 and relay UE#2, respectively. The sidelink bearer configuration includes sidelink bearer indication information, which indicates the sidelink multicast bearer. In addition, the sidelink bearer configuration may also include SL-RLC entity configuration, logical channel configuration, and other information.

[0262] After receiving the sidelink bearer configuration from the gNB, remote UE#1 may send an RRC reconfiguration complete message to the gNB, informing the gNB that the sidelink bearer configuration has been received.

[0263] It should be understood that how the RRC reconfiguration message and the RRC reconfiguration complete message are forwarded is different from the specific implementation method. Figure 7 S701 and S702 are the same and will not be described in detail here.

[0264] S1005, remote UE#1 sends a first message to relay UE#2;

[0265] S1006, remote UE#1 sends a first message to relay UE#3.

[0266] For example, the specific implementation of step S1005 and step S1006 can refer to the above-mentioned step S704 and step S705, which will not be repeated here.

[0267] In the embodiment of the present application, the remote UE#1 allocates the sidelink groupcast identifier by itself and sends the sidelink groupcast identifier to each relay UE respectively, so that when the remote UE sends uplink data using the sidelink groupcast identifier, the relay UE can receive the data in the corresponding groupcast according to the sidelink groupcast identifier received first and forward it to the base station, thereby improving the transmission efficiency of the uplink data.

[0268] Figure 11 is a schematic flow chart of another data transmission method provided by the embodiment of the present application, as shown in Figure 11 , the method comprises a remote UE#1, a relay UE#2, a relay UE#3 and a base station gNB. It should be understood that in Figure 11 , the remote UE#1 is a remote device, the plurality of relay devices are two, which are a relay UE#2 and a relay UE#3, and the wireless access network device is a gNB.

[0269] It should be understood that the application scenario can be Figure 2 , that is Figure 2 , the wireless access network device 210 in Figure 11 , the specific method comprises:

[0270] S1101, the remote UE#1 determines a sidelink groupcast identifier;

[0271] S1102, the remote UE#1 sends a second message to the gNB;

[0272] S1103, the remote UE#1 receives an RRC reconfiguration message sent by the gNB;

[0273] S1104, the remote UE#1 sends an RRC reconfiguration completion message to the gNB.

[0274] Exemplarily, the specific implementation of steps S1101 to S1104 can be referred to the above steps S1001 to S1004, which will not be repeated here.

[0275] S1105, the gNB sends a first message to the relay UE#2;

[0276] S1106, the gNB sends a first message to the relay UE#2.

[0277] Exemplarily, the specific implementation of steps S1105 and S1106 can be referred to the above steps S905 and S906, which will not be repeated here.

[0278] It should be understood that in Figures 7 to 11In any of the methods, when the configuration of the unicast communication means and the groupcast communication means between the remote UE and the relay UE are reserved at the same time, the remote UE can flexibly switch between groupcast and unicast.

[0279] For example, the DRB between the remote UE and the base station corresponds to two sidelink bearers, that is, a first DRB corresponds to a sidelink groupcast bearer and a sidelink unicast bearer at the same time, and at this time, the switching can be performed by the remote UE itself or based on the indication of the base station.

[0280] Optionally, the indication information can be an RRC message or a Uu MAC CE sent by the base station to the relay UE, and then a PC5 MAC CE is generated by the relay UE and forwarded to the remote UE, so that the remote UE flexibly switches between groupcast communication and unicast communication according to the indication information.

[0281] Therefore, by using the above five transmission methods, the remote UE can simultaneously transmit uplink data to multiple relay UEs through a sidelink groupcast manner, thereby improving the efficiency of transmitting uplink data from the remote UE to the radio access network device.

[0282] It should be understood that the above five transmission methods are only examples and are not limited. The remote device determines a sidelink groupcast identifier and directly or indirectly sends the sidelink groupcast identifier to the relay device, and directly or indirectly sends the sidelink groupcast identifier to the radio access network device, which all belong to the protection scope of the embodiments of the present application, and will not be described in detail here.

[0283] When the remote device transmits uplink data using unicast communication or in the scenario as shown in Figure 3 , or when there is no direct link between the remote device and the radio access network device, at this time, the remote device can obtain resources through mode2. Similarly, as shown in Figure 12 , the method includes a remote UE#1, a relay UE#2, a relay UE#3, and a radio access network device gNB. It should be understood that in Figure 12 , the remote UE#1 is a remote device, the plurality of relay devices are two, which are a relay UE#2 and a relay UE#3, and the radio access network device is a gNB. Figure 12 The specific method includes:

[0284] S1201, the remote device receives a configuration message from the radio access network device, and the configuration message is used to configure a shunt ratio of a data amount in a packet data convergence protocol (PDCP) entity transmitted by the remote device to a plurality of relay devices;

[0285] S1202, the remote device transmits data in the PDCP entity to the plurality of relay devices according to the shunt ratio, and the data is uplink data transmitted by the remote device to the radio access network device.

[0286] For example, when a remote device transmits uplink data to a wireless access network device via a unicast connection, to improve data transmission efficiency, the remote device needs to know how much data to send to each relay device. To this end, the remote device needs to determine the data split ratio in the PDCP entity. Generally speaking, the wireless access network device can send a configuration message to the remote device, which is used to configure the split ratio of the data in the PDCP entity sent by the remote device to multiple relay devices.

[0287] Optionally, the configuration message may also include first indication information, which is used to indicate at least two links between the remote device and multiple relay devices. In this case, the above configuration information can be the diversion ratio of the data volume in the PDCP entity sent by the remote device to each side link in at least two links.

[0288] Exemplarily, the first indication information may be an identifier of each relay device, or more specifically, the indication information may be an identifier of the connection link between each relay device and the remote device, such as an L2 identifier.

[0289] For example, if there are two relay devices between remote UE#1 and the gNB, that is, remote UE#1 is connected to the gNB through relay UE#2 and relay UE#3, respectively. Remote UE#1 receives an RRC configuration message from the gNB. This RRC configuration message carries the link identifier L2 ID1 between remote UE#1 and relay UE#2, the link identifier L2 ID2 between remote UE#1 and relay UE#3, and the data allocation ratio corresponding to relay UE#2 is 40% and that corresponding to relay UE#3 is 60%. Remote UE#1 can allocate data to be transmitted to each relay UE based on the configuration message. For example, if the PDCP data volume to be transmitted by remote UE#1 is 100MB, 40MB can be allocated to the link identified by L2 ID1 and 60MB to the link identified by L2 ID2, based on the corresponding ratios. Therefore, when transmitting the data in the PDCP entity, 40M data may be transmitted to the link identified as L2 ID1 and 60M data may be transmitted to the link identified as L2 ID2.

[0290] Optionally, the configuration message may also include second indication information, which is used to indicate that one of the multiple relay devices is the main device and the other devices are auxiliary devices. At this time, the above configuration information can be the diversion ratio of the data volume in the PDCP entity sent to the main device and the auxiliary device.

[0291] Optionally, when there are only two non-direct links between the remote device and the wireless access network device, the second indication information carried in the configuration information sent by the wireless access network device to the remote device indicates that one of the two relay devices is the master device, and indicates the data distribution ratio corresponding to the master device.

[0292] For example, the remote UE#1 is connected to the gNB through the UE#2 and the UE#3. The remote UE#1 receives the RRC configuration message sent by the gNB, and the RRC configuration message carries the second indication information indicating that the remote relay UE#2 is the master device and the data distribution ratio corresponding to the master device is 70%.

[0293] It should be understood that when there are more than two non-direct links between the remote device and the wireless access network device, the wireless access network device can also indicate which relay device is the master device and which relay devices are the auxiliary devices, but in this case, the indication needs to be clear, and the data distribution ratio corresponding to the master device and the auxiliary devices needs to be indicated.

[0294] Optionally, the data distribution ratio mentioned above can be a bearer granularity, that is, the data distribution ratio corresponding to each bearer configuration is different.

[0295] For example, one DRB corresponds to two sidelink bearers, which are sidelink bearer 1 and sidelink bearer 2, wherein the data distribution ratio corresponding to the sidelink bearer 1 is 40%, and the data distribution ratio corresponding to the sidelink bearer 2 is 60%. That is, if there are 100M of data in a DRB, 40M of the data is transmitted through the sidelink bearer 1, and 60M of the data is transmitted through the sidelink bearer 2.

[0296] Optionally, the data distribution ratio mentioned above can be a UE granularity, that is, the data distribution ratio is applicable to all DRBs of the remote device, and it should be noted that the PDCP entity is the PDCP entity of the DRB of the remote device.

[0297] Exemplarily, the remote UE#1 is connected with the gNB through the relay UE#2 and the relay UE#3 respectively, at this time the remote UE#1 has multiple DRBs, it should be understood that one DRB corresponds to one PDCP, that is, if there are three DRBs, at this time the remote UE has three PDCPs corresponding thereto, for example, the split ratio configured between the remote UE#1 and the relay UE#2 is 40%, if there are 100M data in the PDCP1 entity, the remote UE#1 can allocate 40M to the link connected between the remote UE#1 and the relay UE#2, and allocate 60M to the link connected between the remote UE#1 and the relay UE#3; if there are 50M data in the PDCP2, the remote UE#1 can allocate 20M to the link connected between the remote UE#1 and the relay UE#2, and allocate 30M to the link connected between the remote UE#1 and the relay UE#3; if there are 200M in the PDCP3, the remote UE#1 can allocate 80M to the link connected between the remote UE#1 and the relay UE#2, and allocate 120M to the link connected between the remote UE#1 and the relay UE#3.

[0298] It should be understood that when the wireless access network device receives data transmission of one of the links for too long, the configuration message for the remote device to send the data amount split ratio in the PDCP entity of each sidelink in at least two links can be sent to the remote device again, so as to adjust the allocation ratio, optionally, the configuration message can be an RRC reconfiguration message.

[0299] For example, when the remote UE#1 is connected to the gNB through the relay UE#2, the relay UE#3 and the relay UE#4 respectively, in the first sending configuration message, the remote UE#1 should allocate 30% to the relay UE#2, 30% to the relay UE#3 and 40% to the relay UE#4. For example, if there are 100M data in the PDCP of the remote UE#1, 30M data is transmitted to the relay UE#2, 30M data is transmitted to the relay UE#3 and 30M data is transmitted to the relay UE#4. According to the various measurement results reported by the remote UE#1 to the gNB, the time for the gNB to receive the data transmitted by each link can be roughly obtained. However, when the gNB receives the data from the relay UE#2 and the relay UE#4, it takes a long time to receive the data from the relay UE#3. At this time, the gNB can send an RRC reconfiguration message to the remote UE#1, and the reconfiguration message is the adjusted distribution ratio. For example, the allocated data ratio corresponding to the relay UE#2 is 35%, the allocated data ratio corresponding to the relay UE#3 is 20% and the allocated data ratio corresponding to the relay UE#4 is 45%. That is, when the link situation between the relay device and the remote device and the link situation between the relay device and the wireless access network device do not match, the wireless access network device can send a reconfiguration message to the remote device to adjust the distribution ratio of each link, until the data transmission efficiency is the best.

[0300] The embodiment of the present application can make the uplink transmission of the remote device adapt to the uplink situation between the relay devices by providing the distribution ratio of the data quantity in the PDCP entity to the remote device by the wireless access network device, thereby improving the data transmission efficiency.

[0301] Figure 13 is a schematic flow chart of another uplink transmission method provided by the embodiment of the present application, as shown in Figure 13 The method includes a remote UE#1, a relay UE#2 and a base station gNB. It should be understood that in Figure 13 The remote UE#1 is a remote device, the relay device is the relay UE#2 and the wireless access network device is the gNB.

[0302] It should be understood that the application scenario can be Figure 1 That is, the wireless access network device 110 in the figure is the gNB, the remote device 120 is the remote UE#1 and the relay device 130 is the relay UE#2. Figure 13 The specific method includes:

[0303] S1301, the remote UE#1 obtains first indication information;

[0304] S1302, the remote UE#1 calculates a buffer state BS;

[0305] S1303, the remote UE#1 sends the first BSR and / or the second BSR to the gNB;

[0306] S1304, the remote UE#1 receives the third indication information sent by the gNB.

[0307] Exemplarily, when there is both a sidelink and a non-sidelink between the remote device and the wireless access network device, and the remote device needs to transmit uplink data to the wireless access network device, the remote device can first send a buffer status report to the wireless access network device to request scheduling of uplink resources. But in order to avoid repeated sending of data in the PDCP entity of the remote device to cause excessive scheduling, the present embodiment proposes that the buffer status BS is calculated according to the split ratio indicated by the indication information before sending the request message, and then the message requesting scheduling of uplink resources is sent.

[0308] Exemplarily, the remote UE#1 obtaining the first indication information includes receiving the indication information from the wireless access network device or the remote UE#1 obtaining the indication information pre-configured locally by the remote device. That is, the split ratio of the data amount in the PDCP entity of the remote UE#1 can be indicated by the wireless access network device, or can be specified by the protocol. The first indication information indicates the split ratio of the data amount in the PDCP entity, which includes the data ratio of the data amount in the PDCP entity allocated to the first link and / or the data ratio of the data amount allocated to the second link.

[0309] It should be understood that the first link is used for the remote UE#1 to transmit Uu uplink data to the gNB, and the second link is used for the remote UE#1 to transmit sidelink uplink data to the gNB through the relay UE#2 (not shown in the figure).

[0310] After the remote UE#1 receives the first indication information, the BS can be calculated according to the split ratio indicated by the first indication information, and the BS includes the BS in the first BSR and / or the BS in the second BSR, wherein the first BSR is used to request scheduling of Uu uplink resources, and the second BSR is used to request scheduling of sidelink resources. Then, the remote UE#1 can send the first BSR and / or the second BSR to the gNB according to the BS calculated by it.

[0311] Optionally, the remote device local pre-configuration can be that the protocol specifies that the data volume in the PDCP entity is all calculated to the BS in the first BSR for requesting Uu uplink resources, or the data volume in the PDCP entity is all calculated to the BS in the second BSR for requesting sidelink resources. When the data volume in the PDCP entity is all calculated to the BS in the first BSR for requesting Uu uplink resources, the remote UE #1 can send the first BSR to the wireless access network device at this time; when the data volume in the PDCP entity is all calculated to the BS in the second BSR for requesting sidelink resources, the remote UE #1 can send the second BSR to the wireless access network device at this time.

[0312] Optionally, according to the first indication information sent by the wireless access network device, the calculation of the BS can be that the first indication information indicates that the data volume in the PDCP entity is all calculated to the BS in the first BSR for requesting Uu uplink resources, or the data volume in the PDCP entity is all calculated to the BS in the second BSR for requesting sidelink resources, or the first indication information indicates the proportion of the data volume in the PDCP entity allocated to the BS of the first BSR and the proportion allocated to the BS of each second BSR, it should be understood that the shunt proportion range at this time should be greater than zero and less than 1.

[0313] It should be understood that when the first indication information indicates that the data volume in the PDCP entity is all calculated to the BS in the first BSR for requesting Uu uplink resources, the remote UE #1 can send the first BSR to the wireless access network device; when the first indication information indicates that the data volume in the PDCP entity is all calculated to the BS in the second BSR for requesting sidelink resources, the remote UE #1 can send the second BSR to the wireless access network device; when the first indication information indicates that the data volume in the PDCP entity is proportionally allocated to the BS in the first BSR and to the BS in each second BSR, the remote UE #1 can send the first BSR and the second BSR to the wireless access network device.

[0314] It should be understood that when there is one direct link and one non-direct link between the wireless access network device and the remote device, both the above two modes can be adopted. When there is one direct link and multiple non-direct links between the wireless access network device and the remote device, the data volume in the PDCP entity can be proportionally allocated according to the first indication information sent by the wireless access network device, that is, the data volume in the PDCP entity is proportionally allocated to the BS in the first BSR and to the BS in each second BSR.

[0315] Optionally, after the wireless access network device receives the first BSR and / or the second BSR, the wireless access network device can send second indication information to the remote device, and the second indication information is used to indicate to the remote device to schedule Uu uplink resources and sidelink resources.

[0316] Optionally, the indication information can be downlink control information (DCI).

[0317] For example, after the wireless access network device receives the first BSR, the wireless access network device can send a DCI to the remote device, where the DCI schedules both the Uu uplink resource and the sidelink resource, that is, the DCI contains the indication information of scheduling the Uu uplink resource and the sidelink resource. After the remote device receives the indication information, the remote device can send the Uu uplink resource and the sidelink resource to the wireless access network device. After the wireless access network device receives the second BSR, the wireless access network device can also send a DCI to the remote device, where the DCI schedules both the Uu uplink resource and the sidelink resource, that is, the DCI contains the indication information of scheduling the Uu uplink resource and the sidelink resource. After the remote device receives the indication information, the remote device can send the Uu uplink resource and the sidelink resource to the wireless access network device. After the wireless access network device receives the first BSR and the second BSR, the wireless access network device can also send a DCI to the remote device, where the DCI schedules both the Uu uplink resource and the sidelink resource, that is, the DCI contains the indication information of scheduling the Uu uplink resource and the sidelink resource. After the remote device receives the indication information, the remote device can send the Uu uplink resource and the sidelink resource to the wireless access network device. That is, the wireless access network device can schedule the Uu uplink resource and the sidelink resource for the remote device in one DCI.

[0318] Optionally, the split ratio mentioned above can be at the granularity of a bearer, that is, different configurations of the bearers correspond to different ratios, that is, the ratio of the data volume in the PDCP entity allocated to the first link and the second link is different.

[0319] Optionally, the split ratio mentioned above can be at the granularity of a UE, that is, the split ratio is applicable to all DRBs of the remote device. It should be noted that the PDCP entity is the PDCP entity of the DRB of the remote device.

[0320] In the embodiments of the present application, the remote device determines the calculation method of the BS through local pre-configuration or according to the indication information of the wireless access network, and requests the wireless access network device to schedule the uplink resource according to the calculation method of the BS, thereby avoiding the problem of excessive scheduling. Meanwhile, the wireless access network schedules both the Uu uplink resource and the sidelink resource through the indication information, thereby improving the scheduling efficiency.

[0321] In the embodiments of the present application, if not particularly stated, the words “first”, “second” and the like are only used to distinguish different individuals, for example, the “first indication information” and the “second indication information” are two different or independent indication information, and there is no other limitation.

[0322] The following will be described in detail Figures 14 to 21 The communication device provided by the embodiments of the present application will be described in detail.

[0323] Figure 14 is a schematic block diagram of a communication apparatus provided by an embodiment of the present application, as shown in the figure, the communication apparatus 1400 can include a processing unit 1410 and a transceiver unit 1420. Figure 14

[0324] In a possible design, the communication apparatus 1400 can correspond to a remote device in the method embodiments above.

[0325] Specifically, the communication apparatus 1400 can correspond to a remote device according to the embodiments of the present application. Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 the respective procedures of Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 are respectively implemented.

[0326] For example, the processing unit 1410 is configured to determine a sidelink groupcast identifier, the sidelink groupcast identifier being used to identify a groupcast between the remote device and a plurality of relay devices; and the transceiver unit 1420 is configured to send, in a groupcast manner to the plurality of relay devices based on the sidelink groupcast identifier, uplink data, the uplink data being data sent by the remote device to a radio access network device.

[0327] Optionally, the transceiver unit 1420 is further configured to send, to the plurality of relay devices, a first message, the first message including the sidelink groupcast identifier.

[0328] Optionally, the first message further includes sidelink bearer indication information and a first Uu bearer identifier, the first Uu bearer identifier being used to identify a first data radio bearer (DRB) between the remote device and the radio access network device, and the sidelink bearer indication information being used to indicate a sidelink groupcast bearer, the sidelink groupcast bearer having a corresponding relationship with the first DRB.

[0329] Optionally, the transceiver unit 1420 is further configured to receive a configuration message from the radio access network device, the configuration message including a sidelink bearer configuration, the sidelink bearer configuration being used to configure a sidelink groupcast bearer between the remote device and the plurality of relay devices, wherein the remote device determining the sidelink groupcast identifier comprises determining according to the configuration message.

[0330] ​Optionally, the transceiver 1420 is further configured to send, to the wireless access network device, a second message, where the second message comprises the sidelink groupcast identifier.

[0331] Optionally, the transceiver 1420 is further configured to send, to the wireless access network device, a second message, where the second message comprises the sidelink groupcast identifier; and the transceiver 1420 is further configured to receive, from the wireless access network device, a configuration message, where the configuration message comprises a sidelink bearer configuration, and the sidelink bearer configuration is used to configure a sidelink groupcast bearer between the remote device and the plurality of relay devices, and the sidelink groupcast bearer is used to transmit uplink data in a groupcast corresponding to the sidelink groupcast identifier.

[0332] Optionally, the transceiver 1420 is further configured to receive, from the wireless access network device, first indication information, where the first indication information is used to indicate the remote device to determine the sidelink groupcast identifier.

[0333] Optionally, the second message further comprises second indication information, where the second indication information indicates that a groupcast corresponding to the sidelink groupcast identifier is used for the remote device to transmit uplink data.

[0334] Optionally, the sidelink bearer configuration comprises sidelink bearer indication information, where the sidelink bearer indication information is used to indicate the sidelink groupcast bearer, and the configuration message further comprises a first Uu bearer identifier, where the first Uu bearer identifier is used to identify a first DRB between the remote device and the wireless access network device, and the sidelink bearer indication information is used to indicate the sidelink groupcast bearer, and the sidelink groupcast bearer has a corresponding relationship with the first DRB.

[0335] Optionally, the processing unit 1410 is further configured to have the first DRB have a corresponding relationship with the sidelink groupcast bearer and a unicast bearer of the sidelink.

[0336] Optionally, the transceiver 1420 is further configured to receive, from the wireless access network device, third indication information, where the third indication information is used to indicate that a transmission mode between the remote device and the plurality of relay devices is switched from groupcast communication to unicast communication or from unicast communication to groupcast communication.

[0337] Figure 15 is a schematic block diagram of a communication apparatus provided by embodiments of the present application. As shown in the figure, the communication apparatus 1500 can include a receiving unit 1510 and a sending unit 1520.

[0338] In a possible design, the communication apparatus 1500 can correspond to the relay device in the above method embodiments.

[0339] Specifically, the communication apparatus 1500 can correspond to the communication apparatus according to embodiments of the present application.Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 relay device, the units in the communication apparatus 1500 and the above-mentioned other operations and / or functions are respectively used to implement the corresponding flows of Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 .

[0340] For example, the receiving unit 1510 is configured to receive a first message, the first message comprising a sidelink groupcast identifier, the sidelink groupcast identifier being used to identify a groupcast between a remote device and the relay device; and receive uplink data transmitted by the remote device in a groupcast manner based on the sidelink groupcast identifier, the uplink data being data transmitted by the remote device to a radio access network device.

[0341] Optionally, the first message further comprises sidelink bearer indication information and a first Uu bearer identifier, wherein the first Uu bearer identifier is used to identify a first data radio bearer (DRB) between the remote device and the radio access network device, and the sidelink bearer indication information is used to indicate a sidelink groupcast bearer, the sidelink groupcast bearer having a corresponding relationship with the first DRB.

[0342] Optionally, the receiving unit 1510 is further configured to receive the first message from the remote device; or the receiving unit 1510 is further configured to receive the first message from the radio access network device.

[0343] The communication apparatus further comprises a sending unit 1520 configured to send a third message to the radio access network device, the third message comprising the sidelink groupcast identifier; and the receiving unit 1510 is further configured to receive a configuration message from the radio access network device, the configuration message comprising sidelink bearer configuration and a second Uu bearer identifier, wherein the sidelink bearer configuration comprises sidelink bearer indication information, the sidelink bearer indication information being used to indicate a sidelink groupcast bearer, and the second Uu bearer identifier is used to identify a second data radio bearer (DRB) between the relay device and the radio access network device, the sidelink groupcast bearer having a corresponding relationship with the second DRB.

[0344] Optionally, the third message further comprises second indication information, the second indication information indicating that the sidelink groupcast identifier corresponds to a groupcast used for the remote device to transmit uplink data.

[0345] Figure 16is a schematic block diagram of a communication apparatus provided by an embodiment of the present application. As shown in the figure, the communication apparatus 1600 can include a transceiver unit 1610 and a processing unit 1620.

[0346] In a possible design, the communication apparatus 1600 can correspond to the wireless access network device in the method embodiments above.

[0347] Specifically, the communication apparatus 1600 can correspond to the wireless access network device according to the embodiments of the present application. Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 the wireless access network device, the units in the communication apparatus 1600 and the other operations and / or functions described above are respectively configured to implement the corresponding flows of Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 .

[0348] Specifically, the transceiver unit 1610 is configured to send, to a remote device, a configuration message, where the configuration message includes a sidelink bearer configuration, and the sidelink bearer configuration is used to configure a sidelink groupcast bearer between the remote device and a relay device, and the sidelink groupcast bearer is used to transmit uplink data in a groupcast corresponding to a sidelink groupcast identifier, and the sidelink groupcast identifier is used to identify the groupcast between the remote device and the relay device; and the transceiver unit 1610 is further configured to receive a response message from the remote device.

[0349] Optionally, the sidelink bearer configuration includes sidelink bearer indication information, the sidelink bearer indication information is used to indicate the sidelink groupcast bearer, and the configuration message further includes a first Uu bearer identifier, and the first Uu bearer identifier is used to identify a first data radio bearer (DRB) between the remote device and the wireless access network device, and the sidelink bearer indication information is used to indicate the sidelink groupcast bearer, and the sidelink groupcast bearer has a corresponding relationship with the first DRB.

[0350] Optionally, the transceiver unit 1610 is further configured to receive a second message from the remote device, and the second message includes the sidelink groupcast identifier.

[0351] Optionally, the transceiver unit 1610 is further configured to receive a second message from the remote device, and the second message includes the sidelink groupcast identifier, and the wireless access network device sends the configuration message to the remote device according to the second message.

[0352] Optionally, the transceiver 1610 is further configured to send, to the remote device, first indication information, the indication information being used to instruct the remote device to determine the sidelink groupcast identification.

[0353] Optionally, the transceiver 1610 is further configured to send, to the relay device, a first message, the first message comprising the sidelink groupcast identification.

[0354] Optionally, the first message further comprises sidelink bearer indication information and a first Uu bearer identification, the first Uu bearer identification being used to identify a first data radio bearer (DRB) between the remote device and the radio access network device, and the sidelink bearer indication information being used to indicate a sidelink groupcast bearer, the sidelink groupcast bearer having a correspondence relationship with the first DRB.

[0355] Optionally, the second message further comprises second indication information, the second indication information indicating that the sidelink groupcast identification corresponds to a groupcast used for the remote device to transmit uplink data.

[0356] Optionally, the transceiver 1610 is further configured to receive, from the relay device, a third message, the third message comprising the sidelink groupcast identification; and the transceiver 1610 is further configured to send, to the relay device, a configuration message, the configuration message comprising sidelink bearer configuration and a second Uu bearer identification, wherein the sidelink bearer configuration comprises sidelink bearer indication information, the sidelink bearer indication information being used to indicate a sidelink groupcast bearer, and the second Uu bearer identification being used to identify a second data radio bearer (DRB) between the relay device and the radio access network device, the sidelink groupcast bearer having a correspondence relationship with the second DRB.

[0357] Optionally, the third message further comprises second indication information, the indication information indicating that the sidelink groupcast identification corresponds to a groupcast used for the remote device to transmit uplink data.

[0358] Optionally, the communication apparatus further comprises a processing unit 1620, configured to have a correspondence relationship between the first DRB and the sidelink groupcast bearer and a unicast bearer of the sidelink.

[0359] Optionally, the transceiver 1610 is further configured to send, to the remote device, third indication information, the third indication information being used to instruct the remote device and the relay device to switch a transmission mode from groupcast communication to unicast communication or from unicast communication to groupcast communication.

[0360] Figure 17 FIG. 17 is a schematic block diagram of a communication apparatus provided by an embodiment of the present application. As shown in the figure, the communication apparatus 1700 can comprise a transceiver 1710 and a computing unit 1720.

[0361] In a possible design, the communication apparatus 1700 can correspond to a remote device in the foregoing method embodiments.

[0362] Specifically, the communication apparatus 1700 can correspond to a remote device according to the embodiments of the present application. Figure 13 The units in the communication apparatus 1700 and the other operations and / or functions described above can be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processors (DSPs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, other electronic units, or a combination thereof. Figure 13

[0363] Specifically, the transceiver 1710 is configured to obtain first indication information, the first indication information indicating a split ratio of a data amount in a packet data convergence protocol (PDCP) entity; and the calculation unit 1720 is configured to calculate a buffer status (BS) according to the split ratio indicated by the first indication information.

[0364] Optionally, the split ratio includes a data ratio of the data amount in the PDCP entity allocated to a first link and / or a data ratio of the data amount in the PDCP entity allocated to a second link, the first link being used for the remote device to transmit uplink data to a radio access network device, and the second link being used for the remote device to transmit uplink data to the radio access network device through a plurality of relay devices; the calculation unit 1720 calculates the BS according to the split ratio includes calculating the BS in a first buffer status report (BSR) according to the split ratio and / or calculating the BS in a second BSR according to the split ratio, the first BSR being used for requesting to schedule a Uu uplink resource, and the second BSR being used for requesting to schedule a sidelink resource; and the transceiver 1710 is further configured to send the first BSR and / or the second BSR to the radio access network device.

[0365] Optionally, the transceiver 1710 is further configured to receive the first indication information from the radio access network device; or the transceiver is further configured to obtain the first indication information pre-configured locally by the remote device.

[0366] Optionally, the calculation unit 1720 is specifically configured to allocate the data amount in the PDCP entity to the BS in the first BSR in an entirety, where the transceiver 1710 is configured to send the first BSR to the radio access network device; or the calculation unit 1720 is specifically configured to allocate the data amount in the PDCP entity to the BS in the second BSR in an entirety, where the transceiver 1710 is configured to send the second BSR to the radio access network device; or the calculation unit 1720 is specifically configured to allocate the data amount in the PDCP entity to the BS in the first BSR and the BS in the second BSR in proportion, the split ratio being greater than zero and less than 1, where the transceiver 1710 is configured to send the first BSR and the second BSR to the radio access network device.

[0367] ​Optionally, the split ratio is applicable to all data radio bearers (DRBs) of the remote device, and the PDCP entity is a PDCP entity of the DRB of the remote device.

[0368] Optionally, the first indication information further includes a bearer identifier corresponding to the split ratio.

[0369] Optionally, the transceiver 1710 is further configured to receive second indication information from the network device, the second indication information being used to indicate to the remote device to schedule the Uu uplink resource and the sidelink resource.

[0370] Figure 18 is a schematic block diagram of a communication apparatus provided by an embodiment of the present application. As shown in the figure, the communication apparatus 1800 can include a sending unit 1810 and a receiving unit 1820.

[0371] In a possible design, the communication apparatus 1800 can correspond to the radio access network device in the above method embodiments.

[0372] Specifically, the communication apparatus 1800 can correspond to the radio access network device according to the embodiments of the present application, and each unit in the communication apparatus 1800 and the above other operations and / or functions are respectively implemented to implement the corresponding procedures. Figure 13 Figure 13

[0373] Specifically, the sending unit 1810 is configured to send, to a remote device, a first indication message used to indicate a split ratio of a data quantity in a packet data convergence protocol (PDCP) entity; and the receiving unit 1820 is configured to receive a first buffer status report (BSR) and / or a second BSR sent by the remote device, the first BSR being used to request scheduling of a Uu uplink resource, and the second BSR being used to request scheduling of a sidelink resource.

[0374] Optionally, the split ratio includes a data ratio of a data quantity in the PDCP entity allocated to a first link and / or a data ratio of the data quantity in the PDCP entity allocated to a second link, the first link being used for the radio access network device to receive uplink data transmitted by the remote device, and the second link being used for the radio access network device to receive the uplink data transmitted by the remote device through a plurality of relay devices.

[0375] Optionally, the split ratio is applicable to all data radio bearers (DRBs) of the remote device, and the PDCP entity is a PDCP entity of the DRB of the remote device.

[0376] Optionally, the first indication information further includes a bearer identifier corresponding to the split ratio.

[0377] ​​Optionally, the sending unit 1810 is further configured to send second indication information to the remote device, where the second indication information is used to indicate to the remote device to schedule the Uu uplink resource and the sidelink resource.

[0378] Figure 19 is a schematic block diagram of a communication apparatus provided by an embodiment of the present application. As shown in the figure, the communication apparatus 1900 can include a receiving unit 1910 and a sending unit 1920.

[0379] In a possible design, the communication apparatus 1900 can correspond to the remote device in the above method embodiments.

[0380] Specifically, the communication apparatus 1900 can correspond to the remote device according to the embodiments of the present application. Figure 12 The units in the communication apparatus 1900 and the other operations and / or functions described above are respectively used to implement the corresponding flows. Figure 12

[0381] Specifically, the receiving unit 1910 is configured to receive a configuration message from a radio access network device, where the configuration message is used to configure a remote device to send a split ratio of a data amount in a packet data convergence protocol (PDCP) entity to a plurality of relay devices; and the sending unit 1920 is configured to send data in the PDCP entity to the plurality of relay devices, where the data is uplink data sent by the remote device to the radio access network device.

[0382] Optionally, the configuration message further includes first indication information, where the first indication information is used to indicate at least two sidelinks between the remote device and the plurality of relay devices, and the configuration message is used to configure the remote device to send a split ratio of a data amount in the PDCP entity to each of the at least two sidelinks.

[0383] Optionally, the configuration message further includes second indication information, where the second indication information is used to indicate that one of the plurality of relay devices is a master device, and the remaining devices of the plurality of relay devices are auxiliary devices, and the configuration message is used to configure the remote device to send a split ratio of a data amount in the PDCP entity to the master device and the auxiliary devices respectively.

[0384] Optionally, the split ratio is applicable to all data radio bearers (DRBs) of the remote device, and the PDCP entity is a PDCP entity of the DRB of the remote device.

[0385] Figure 20 is a schematic block diagram of a communication apparatus provided by an embodiment of the present application. As shown in the figure, the communication apparatus 2000 can include a sending unit 2010 and a receiving unit 2020.

[0386] ​In a possible design, the communication apparatus 2000 can correspond to the wireless access network device in the foregoing method embodiments.

[0387] Specifically, the communication apparatus 2000 can correspond to the wireless access network device according to the embodiments of the present application. Figure 12 The units in the communication apparatus 2000 and the other operations and / or functions described above can be respectively implemented by one or more application specific integrated circuits (ASICs), one or more processors of a processing system, or one or more field programmable gate arrays (FPGAs). Figure 12

[0388] Specifically, the sending unit 2010 is configured to send a configuration message to a remote device, where the configuration message is used to configure the remote device to send a split ratio of a data amount in a packet data convergence protocol (PDCP) entity to a plurality of relay devices; and the receiving unit 2020 is configured to receive uplink data transmitted by the plurality of relay devices, where the uplink data is data sent by the remote device to a wireless access network device.

[0389] Optionally, the configuration message further includes first indication information, where the first indication information is used to indicate at least two sidelinks between the remote device and the plurality of relay devices, and the configuration message is used to configure the remote device to send a split ratio of the data amount in the PDCP entity to each of the at least two sidelinks.

[0390] Optionally, the configuration message further includes second indication information, where the second indication information is used to indicate that one of the plurality of relay devices is a primary device, and the remaining devices of the plurality of relay devices are secondary devices, and the configuration message is used to configure the remote device to send a split ratio of the data amount in the PDCP entity to the primary device and the secondary devices respectively.

[0391] Optionally, the split ratio is applicable to all data radio bearers (DRBs) of the remote device, and the PDCP entity is a PDCP entity of the DRB of the remote device.

[0392] According to the foregoing method, Figure 21 a schematic diagram of a communication apparatus 2100 provided by the embodiments of the present application is shown in Figure 21 The apparatus 2100 can include a processor 2110 and can further include a memory 2120. The memory 2120 is configured to store instructions, and the processor 2110 is configured to execute the instructions stored in the memory 2120, so that the apparatus 2100 performs the steps performed in any of the corresponding methods. Figures 6 to 13

[0393] ​​Further, the apparatus 2100 can further include an input port 2130 (i.e., an example of a transceiver module) and an output port 2140 (i.e., another example of a transceiver module). Further, the processor 2110, the memory 2120, the input port 2130, and the output port 2140 can communicate with each other by internal connection paths to pass control and / or data signals. The memory 2120 is used to store a computer program, and the processor 2110 can be used to call and run the computer program from the memory 2120 to control the input port 2130 to receive signals and control the output port 2140 to send signals, so as to complete the steps of the terminal device in the above method. The memory 2120 can be integrated in the processor 2110, or can be separately arranged from the processor 2110.

[0394] Optionally, if the communication apparatus 2100 is a communication device, the input port 2130 is a receiver, and the output port 2140 is a transmitter. The receiver and the transmitter can be the same or different physical entities. When they are the same physical entity, they can be collectively referred to as a transceiver.

[0395] Optionally, if the communication apparatus 2100 is a chip or a circuit, the input port 2130 is an input interface, and the output port 2140 is an output interface.

[0396] As an implementation manner, the functions of the input port 2130 and the output port 2140 can be implemented by a transceiver circuit or a transceiver dedicated chip. The processor 2110 can be implemented by a dedicated processing chip, a processing circuit, a processor, or a general-purpose chip.

[0397] As another implementation manner, a general-purpose computer can be used to implement the communication device provided in the embodiments of the present application. That is, program codes for implementing the functions of the processor 2110, the input port 2130, and the output port 2140 are stored in the memory 2120, and the general-purpose processor implements the functions of the processor 2110, the input port 2130, and the output port 2140 by executing the codes in the memory 2120.

[0398] The concepts, explanations, detailed descriptions, and other steps related to the technical solutions provided in the embodiments of the present application involved in the apparatus 2100 are described in the foregoing method or other embodiments, and will not be described here.

[0399] In addition, the embodiments of the present application also provide a communication system, which includes one or more of the remote device, the relay device, and the radio access network device in the embodiments of the present application.

[0400] Those skilled in the art can clearly understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0401] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

[0402] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the above-described device embodiments are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0403] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0404] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically, or two or more units can be integrated into one unit.

[0405] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the parts that contribute to the prior art or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0406] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A data transmission method, characterized by, The method comprises: A remote device determines a sidelink groupcast identifier, the sidelink groupcast identifier being used to identify a groupcast between the remote device and a plurality of relay devices; The remote device transmits uplink data to the plurality of relay devices in a groupcast manner based on the sidelink groupcast identifier, the uplink data being data transmitted by the remote device to a radio access network device; The method further comprises: The remote device transmits a first message to the plurality of relay devices, the first message comprising the sidelink groupcast identifier, the first message further comprising sidelink bearer indication information and a first Uu bearer identifier, the first Uu bearer identifier being used to identify a first data radio bearer (DRB) between the remote device and the radio access network device, the sidelink bearer indication information being used to indicate a sidelink groupcast bearer, the sidelink groupcast bearer having a correspondence relationship with the first DRB.

2. The method of claim 1, wherein, The method further comprises: The remote device receives a configuration message from the radio access network device, the configuration message comprising a sidelink bearer configuration, the sidelink bearer configuration being used to configure a sidelink groupcast bearer between the remote device and the plurality of relay devices, wherein the remote device determining the sidelink groupcast identifier comprises determining according to the configuration message.

3. The method of claim 2, wherein, The method further comprises: The remote device transmits a second message to the radio access network device, the second message comprising the sidelink groupcast identifier.

4. The method of claim 1, wherein, After the remote device determines the sidelink groupcast identifier, the method further comprises: The remote device transmits a second message to the radio access network device, the second message comprising the sidelink groupcast identifier; The remote device receives a configuration message from the radio access network device, the configuration message comprising a sidelink bearer configuration, the sidelink bearer configuration being used to configure a sidelink groupcast bearer between the remote device and the plurality of relay devices, the sidelink groupcast bearer being used to transmit uplink data in a groupcast corresponding to the sidelink groupcast identifier.

5. The method of claim 4, wherein, The method further comprises: The remote device receives first indication information from the radio access network device, the first indication information being used to instruct the remote device to determine the sidelink groupcast identifier.

6. The method according to claim 4 or 5, characterized in that, The second message further comprises second indication information, the second indication information indicating that a groupcast corresponding to the sidelink groupcast identifier is used by the remote device to transmit uplink data.

7. The method according to any one of claims 2 to 5, characterized in that, The sidelink bearer configuration comprises the sidelink bearer indication information and the first Uu bearer identifier.

8. The method according to any one of claims 1 to 5, characterized in that, The method further comprises: The first DRB has a correspondence relationship with the sidelink groupcast bearer and a unicast bearer of the sidelink.

9. The method of claim 8, wherein, The method further comprises: The remote device receives third indication information from the radio access network device, the third indication information being used to instruct a transmission manner between the remote device and the plurality of relay devices to be switched from groupcast communication to unicast communication or from unicast communication to groupcast communication.

10. A data transmission method, characterized by, The method comprises: The relay device receives a first message, the first message comprising a sidelink groupcast identifier, the sidelink groupcast identifier being used to identify a groupcast between a remote device and the relay device, the first message further comprising sidelink bearer indication information and a first Uu bearer identifier, wherein the first Uu bearer identifier is used to identify a first data radio bearer (DRB) between the remote device and a radio access network device, and the sidelink bearer indication information is used to indicate a sidelink groupcast bearer, the sidelink groupcast bearer having a correspondence relationship with the first DRB. The relay device receives uplink data sent by the remote device in a groupcast manner based on the sidelink groupcast identifier, the uplink data being data sent by the remote device to the radio access network device.

11. The method of claim 10, wherein, The relay device receives a first message, comprising: The relay device receives the first message from the remote device; or The relay device receives the first message from the radio access network device.

12. The method of claim 11, wherein, When the relay device receives the first message from the remote device, the method further comprises: The relay device sends a third message to the radio access network device, the third message comprising the sidelink groupcast identifier; The relay device receives a configuration message from the radio access network device, the configuration message comprising sidelink bearer configuration and a second Uu bearer identifier, wherein the sidelink bearer configuration comprises sidelink bearer indication information, the sidelink bearer indication information being used to indicate a sidelink groupcast bearer, and the second Uu bearer identifier is used to identify a second data radio bearer (DRB) between the relay device and the radio access network device, the sidelink groupcast bearer having a correspondence relationship with the second DRB.

13. The method of claim 12, wherein, The third message further comprises second indication information, the second indication information indicating that the sidelink groupcast identifier corresponding groupcast is used for the remote device to transmit uplink data.

14. A data transmission method, characterized by, Comprising: The radio access network device sends a configuration message to a remote device, the configuration message comprising sidelink bearer configuration, the sidelink bearer configuration being used to configure a sidelink groupcast bearer between the remote device and a plurality of relay devices, the sidelink groupcast bearer being used to transmit uplink data in a groupcast corresponding to a sidelink groupcast identifier, the sidelink groupcast identifier being used to identify a groupcast between the remote device and the plurality of relay devices, the sidelink bearer configuration comprising sidelink bearer indication information, the sidelink bearer indication information being used to indicate the sidelink groupcast bearer, and the configuration message further comprising a first Uu bearer identifier, the first Uu bearer identifier being used to identify a first data radio bearer (DRB) between the remote device and the radio access network device, the sidelink groupcast bearer having a correspondence relationship with the first DRB. The radio access network device receives a response message from the remote device.

15. The method of claim 14, wherein, After the radio access network device sends a configuration message to a remote device, the method further comprises: The wireless access network device receives a second message from the remote device, the second message comprising the sidelink groupcast identifier.

16. The method according to claim 14 or 15, characterized in that The method further comprises: The wireless access network device receives a second message from the remote device, the second message comprising the sidelink groupcast identifier, wherein the wireless access network device sends a configuration message to the remote device according to the second message.

17. The method of claim 16, wherein, Before the wireless access network device receives the second message from the remote device, the method further comprises: The wireless access network device sends first indication information to the remote device, the indication information being used to instruct the remote device to determine the sidelink groupcast identifier.

18. The method of claim 15, wherein, The method further comprises: The wireless access network device sends a first message to the relay device, the first message comprising the sidelink groupcast identifier.

19. The method of claim 18, wherein, The first message further comprises the sidelink bearer indication information and the first Uu bearer identifier.

20. The method of claim 15, wherein, The second message further comprises second indication information, the second indication information indicating that the groupcast corresponding to the sidelink groupcast identifier is used for the remote device to transmit uplink data.

21. The method of claim 14, wherein, The method further comprises: The wireless access network device receives a third message from the relay device, the third message comprising the sidelink groupcast identifier; The wireless access network device sends a configuration message to the relay device, the configuration message comprising sidelink bearer configuration and a second Uu bearer identifier, wherein the sidelink bearer configuration comprises sidelink bearer indication information, the sidelink bearer indication information being used to instruct a sidelink groupcast bearer, and the second Uu bearer identifier being used to identify a second data radio bearer (DRB) between the relay device and the wireless access network device, the sidelink groupcast bearer having a corresponding relationship with the second DRB.

22. The method of claim 21, wherein, The third message further comprises second indication information, the indication information indicating that the groupcast corresponding to the sidelink groupcast identifier is used for the remote device to transmit uplink data.

23. The method of claim 14 or 15, wherein, The method further comprises: The first DRB has a corresponding relationship with the sidelink groupcast bearer and a unicast bearer of the sidelink.

24. The method of claim 23, wherein, The method further comprises: The wireless access network device sends third indication information to the remote device, the third indication information being used to instruct the transmission mode between the remote device and the relay device to switch from groupcast communication to unicast communication or from unicast communication to groupcast communication.

25. A method of data transmission, characterized by, Comprises: The remote device obtains first indication information, the first indication information indicating a split ratio of a data amount in a packet data convergence protocol (PDCP) entity, the split ratio comprising a data ratio of the data amount in the PDCP entity allocated to a first link and a data ratio of the data amount in the PDCP entity allocated to a second link, the first link being used for the remote device to transmit uplink data to a wireless access network device, and the second link being used for the remote device to transmit uplink data to the wireless access network device through a plurality of relay devices; The remote device calculates a buffer status (BS) according to the split ratio indicated by the first indication information; The remote device calculates buffer status (BS) according to the split ratio indicated by the first indication information, and the BS includes: The remote device calculates BS in a first buffer status report (BSR) and a second BSR according to the split ratio, the first BSR is used to request scheduling of Uu uplink resources, and the second BSR is used to request scheduling of sidelink resources; The method further includes: The remote device sends the first BSR and / or the second BSR to the radio access network device.

26. The method of claim 25, wherein, The remote device obtains first indication information, which includes: The remote device receives the first indication information from the radio access network device; or The remote device obtains the first indication information pre-configured locally by the remote device.

27. The method of claim 25 or 26, wherein, The remote device calculates buffer status (BS) according to the split ratio indicated by the first indication information, and the BS includes: All data in the PDCP entity is allocated to BS in the first BSR, wherein the remote device sends the first BSR to the radio access network device; or All data in the PDCP entity is allocated to BS in the second BSR, wherein the remote device sends the second BSR to the radio access network device; or Data in the PDCP entity is allocated to BS in the first BSR and BS in the second BSR in proportion, the split ratio ranges from greater than zero to less than 1, wherein the remote device sends the first BSR and the second BSR to the radio access network device.

28. The method of claim 25 or 26, wherein, The split ratio is applicable to all data radio bearers (DRBs) of the remote device, and the PDCP entity is a PDCP entity of the DRB of the remote device.

29. The method of claim 25 or 26, wherein, The first indication information further includes a bearer identifier corresponding to the split ratio.

30. The method of claim 25 or 26, wherein, The method further includes: The remote device receives second indication information from the radio access network device, the second indication information being used to indicate scheduling of the Uu uplink resources and the sidelink resources.

31. A method of data transmission, characterized by including: The radio access network device sends a first indication message to the remote device, the first indication message being used to indicate a split ratio of data in a packet data convergence protocol (PDCP) entity, the split ratio including a data ratio of data in the PDCP entity allocated to a first link and a data ratio of data in the PDCP entity allocated to a second link, the first link being used for the remote device to transmit uplink data to the radio access network device, and the second link being used for the remote device to transmit uplink data to the radio access network device through a plurality of relay devices; The radio access network device receives a first buffer status report (BSR) and / or a second BSR sent by the remote device, the first BSR being used to request scheduling of Uu uplink resources, and the second BSR being used to request scheduling of sidelink resources.

32. The method of claim 31, wherein, The split ratio is applicable to all data radio bearers (DRBs) of the remote device, and the PDCP entity is a PDCP entity of the DRB of the remote device.

33. The method of claim 31 or 32, wherein, The first indication information further comprises a bearer identifier corresponding to the split ratio.

34. The method of claim 31 or 32, wherein, The method further comprises: The radio access network device sends second indication information to the remote device, wherein the second indication information is used to indicate to the remote device to schedule the Uu uplink resource and the sidelink resource.

35. A method of data transmission, characterized by Comprise: The remote device receives a configuration message from the radio access network device, wherein the configuration message is used to configure the remote device to send a split ratio of a data amount in a packet data convergence protocol (PDCP) entity to a plurality of relay devices; The remote device sends data in the PDCP entity to the plurality of relay devices according to the split ratio, wherein the data is uplink data sent by the remote device to the radio access network device; wherein: The configuration message further comprises first indication information, wherein the first indication information is used to indicate at least two sidelinks between the remote device and the plurality of relay devices, and the configuration message is used to configure the remote device to send a split ratio of a data amount in the PDCP entity to each of the at least two sidelinks; or, The configuration message further comprises second indication information, wherein the second indication information is used to indicate that one of the plurality of relay devices is a master device and the remaining devices of the plurality of relay devices are auxiliary devices, and the configuration message is used to configure the remote device to send a split ratio of a data amount in the PDCP entity to the master device and the auxiliary devices respectively.

36. The method of claim 35, wherein, The split ratio is applicable to all data radio bearers (DRBs) of the remote device, and the PDCP entity is a PDCP entity of the DRB of the remote device.

37. A method of data transmission, characterized by Comprise: The radio access network device sends a configuration message to the remote device, wherein the configuration message is used to configure the remote device to send a split ratio of a data amount in a packet data convergence protocol (PDCP) entity to a plurality of relay devices; The radio access network device receives uplink data transmitted by the plurality of relay devices, wherein the uplink data is data sent by the remote device to the radio access network device; wherein: The configuration message further comprises first indication information, wherein the first indication information is used to indicate at least two sidelinks between the remote device and the plurality of relay devices, and the configuration message is used to configure the remote device to send a split ratio of a data amount in the PDCP entity to each of the at least two sidelinks; or, The configuration message further comprises second indication information, wherein the second indication information is used to indicate that one of the plurality of relay devices is a master device and the remaining devices of the plurality of relay devices are auxiliary devices, and the configuration message is used to configure the remote device to send a split ratio of a data amount in the PDCP entity to the master device and the auxiliary devices respectively.

38. The method of claim 37, wherein, The split ratio is applicable to all data radio bearers (DRBs) of the remote device, and the PDCP entity is a PDCP entity of the DRB of the remote device.

39. A data transmission device, comprising: Comprise: Units for implementing the method of any one of claims 1 to 9; or a unit for implementing the method of any one of claims 10 to 13; or a unit for implementing the method of any one of claims 14 to 24.

40. A data transmission device, comprising: comprising: a unit for implementing the method of any one of claims 25 to 30; or a unit for implementing the method of any one of claims 31 to 34. comprising:

41. A data transmission device, comprising: a unit for implementing the method of claim 35 or 36; or a unit for implementing the method of claim 37 or 38. comprising:

42. A communications device, characterized by a processor for calling and running a computer program from a memory, so that the communication device performs the method of any one of claims 1 to 9, or of any one of claims 10 to 13, or of any one of claims 14 to 24. comprising:

43. A communications device, characterized by a processor for calling and running a computer program from a memory, so that the communication device performs the method of any one of claims 25 to 30, or of any one of claims 31 to 34. comprising:

44. A communications device, characterized by a processor for calling and running a computer program from a memory, so that the communication device performs the method of claim 35 or 36, or of claim 37 or 38. a computer readable storage medium having stored thereon a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 9, or to perform the method of any one of claims 10 to 13, or to perform the method of any one of claims 14 to 24.

45. A computer-readable storage medium, comprising: a computer readable storage medium having stored thereon a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 25 to 30, or to perform the method of any one of claims 31 to 34.

46. A computer-readable storage medium, characterized in that, a computer readable storage medium having stored thereon a computer program which, when run on a computer, causes the computer to perform the method of claim 35 or 36, or to perform the method of claim 37 or 38.

47. A computer-readable storage medium, comprising: comprising:

48. A chip system, characterized by a processor for calling and running a computer program from a memory, so that the communication device installed with the chip system performs the method of any one of claims 1 to 9, or performs the method of any one of claims 10 to 13, or performs the method of any one of claims 14 to 24. comprising:

49. A chip system, characterized by a processor for calling and running a computer program from a memory, so that the communication device installed with the chip system performs the method of any one of claims 25 to 30, or performs the method of any one of claims 31 to 34.

50. A chip system, characterized by comprising: a processor for calling and running a computer program from a memory, so that the communication device installed with the chip system performs the method of claim 35 or 36, or performs the method of claim 37 or 38.

51. A communication system, characterized by The communication system comprises a remote device configured to perform the method according to any one of claims 1 to 9, a relay device configured to perform the method according to any one of claims 10 to 13, and a radio access network device configured to perform the method according to any one of claims 14 to 24.

52. A communication system, characterized by The communication system comprises a remote device configured to perform the method according to any one of claims 25 to 30, and a radio access network device configured to perform the method according to any one of claims 31 to 34.

53. A communication system, characterized by The communication system comprises a remote device configured to perform the method according to claim 35 or 36, and a radio access network device configured to perform the method according to claim 37 or 38.

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