CN110636549B - Data transmission method, network equipment and terminal equipment - Google Patents

Abstract

The embodiments of the present application disclose a data transmission method, a network device, and a terminal device. The method includes: a first network device receives first configuration information of a second network device, where the first configuration information includes at least one of the following information: A bearer ARQ feedback mode, the node identifier of the first network device, the identifier of the first bearer, the identifier of the terminal device, the logical channel identifier, and the ARQ target node identifier; the first network device determines whether to perform ARQ feedback according to the first configuration information. Data transmission can be performed efficiently under different ARQ mechanisms.

Description

Data transmission method, network device and terminal device

technical field

The present application relates to the field of communication technologies, and in particular, to a data transmission method, a network device, and a terminal device.

Background technique

The long term evolution (LTE) relay (relay) technology is to forward the base station (evolved universal terrestrial radio access network node B, eNB) and user equipment (user equipment) by deploying a relay node (relay node, RN) in the network , UE) data technology, which can enhance network capacity, solve backhaul connections between base stations, and solve coverage blind spots.

In the wireless relay networking scenario for 5G (5th generation mobile networks or 5th generation wireless systems, 5G), multi-hop wireless relay and multi-connection scenarios will be supported. In the networking scenario of multi-hop wireless relay, there are one or more relay nodes participating in data forwarding between the user equipment and the base station, and the number of relay nodes is the hop count.

In the multi-hop wireless relay networking scenario, the relay node can use hop-by-hop radio link control (RLC) management, that is, each relay node can directly use 5G/NR (new radio, NR) In this way, the data sent to the next hop or the previous hop can be processed, and end-to-end RLC management can also be used. In order to ensure the reliability of data transmission, the RLC layer supports the function of automatic repeat request (Automatic Repeat Request, ARQ).

In 5G, the ARQ mechanism can be hop-by-hop ARQ or end-to-end ARQ. Different ARQ mechanisms operate on data in different ways. How to ensure effective data transmission under different ARQ mechanisms is a problem that needs to be solved. The problem.

SUMMARY OF THE INVENTION

The technical problem to be solved by the embodiments of the present application is to provide a data transmission method, a network device, and a terminal device, which can effectively perform data transmission under different ARQ mechanisms.

In a first aspect, an embodiment of the present application provides a data transmission method. A first network device receives first configuration information of a second network device, where the first configuration information includes at least one of the following information: ARQ feedback information, the node identifier of the first network device, the identifier of the first bearer, the identifier of the terminal device, the logical channel identifier, and the ARQ target node identifier; the first network device determines according to the first configuration information Whether to perform ARQ feedback.

In this implementation manner, the first network device determines whether to perform ARQ feedback based on the first configuration information of the second network device, and can effectively perform data transmission under different ARQ mechanisms.

In a possible implementation manner, the ARQ feedback information of the first bearer includes: one of end-to-end feedback, hop-by-hop feedback, and feedback indication; the feedback indication is used to instruct the first network device to perform an ARQ feedback or no ARQ feedback is performed on the data of the first bearer.

In a possible implementation manner, the ARQ feedback information of the first configuration information corresponds to one or more first bearers of the terminal device, or corresponds to all bearers of the terminal device.

In a possible implementation manner, the first configuration information may further include a transmission direction indication, and the transmission direction indication includes uplink transmission or downlink transmission.

In a possible implementation manner, the determining by the first network device whether to perform ARQ feedback according to the first configuration information includes:

If the ARQ feedback information includes end-to-end feedback, if the identifier of the first network device is the same as the identifier of the ARQ target node, the first network device sends ARQ feedback, and if the identifier of the first network device and the identifier of the ARQ target node are different, the first network device The network device does not perform ARQ feedback, and forwards the data of the first bearer;

If the ARQ feedback information includes hop-by-hop feedback, the first network device sends ARQ feedback when receiving the data carried by the first bearer;

If the ARQ feedback information includes a feedback indication, the first network device determines whether to perform ARQ feedback on the first bearer data according to the feedback indication.

In a second aspect, an embodiment of the present application provides a data transmission method. A second network device determines first configuration information, and the second network device sends the first configuration information to the first network device, where the first configuration information includes the following information At least one of: ARQ feedback information of the first bearer, the node identifier of the first network device, the identifier of the first bearer, the identifier of the terminal device, the logical channel identifier, and the ARQ target node identifier.

In this implementation manner, the second network device sends the first configuration information to the first network device, and the first network device determines whether to perform ARQ feedback based on the first configuration information, which can effectively perform data transmission under different ARQ mechanisms.

In a possible implementation manner, the ARQ feedback information of the first bearer includes: one of end-to-end feedback, hop-by-hop feedback, and feedback indication; the feedback indication is used to instruct the first network device to perform an ARQ feedback or no ARQ feedback is performed on the data of the first bearer.

In a possible implementation manner, the first configuration information may further include a transmission direction indication, and the transmission direction indication includes uplink transmission or downlink transmission.

In a third aspect, an embodiment of the present application provides a data transmission method, in which a first network device sends return indication information to a third network device, where the return indication information is used to notify the third network device to receive return data , the return data is data belonging to a third network device that the first network device fails to send; the first network device sends the return data to the third network device; the first network device sends the return data to the third network device; is the upper-level node of the third network device.

In this implementation manner, the third network device forwards the data to the upper-level node of the first network device via the first network device, and the upper-level node of the first network device fails to decode the data, the first network device can send the data to the third network device. Sending back the indication information, and sending the data to the third network device, so that the third network device transmits the data to the receiving end through other paths, so that data retransmission and recovery across multiple hops can be implemented.

In a possible implementation manner, after the first network device sends the backhaul indication information, it receives feedback information sent by the third network device.

In a possible implementation manner, after receiving the feedback information, the first network device stops receiving uplink data sent by the third network device.

In a fourth aspect, an embodiment of the present application provides a data transmission method, wherein a terminal device receives third configuration information from a second network device, where the third configuration information includes retransmission indication information, and the retransmission indication information is used for Instruct the terminal device to perform data retransmission, and the retransmission indication information includes the sequence number SN of the packet data unit PDU of the PDCP layer of the Packet Data Convergence Protocol; the terminal device performs data retransmission of the PDCP PDU according to the retransmission indication information pass.

In this implementation, the second network device sends the third configuration information to the terminal device, and the terminal device retransmits PDCP PDU data according to the retransmission indication information, which can effectively implement data retransmission and improve the utilization rate of air interface resources.

In a possible implementation manner, the retransmission indication information includes a cause value and/or the number K of retransmission packets.

In a possible implementation manner, the data retransmission of the PDCP PDU by the terminal device according to the retransmission indication information includes:

The terminal device retransmits all data after the SN according to the SN;

The data after all the SNs includes the packet data of all PDCP PDUs to which PDCP packet sequence numbers are assigned after the SN.

In a possible implementation manner, the data retransmission of the PDCP PDU by the terminal device according to the retransmission indication information includes:

The terminal device retransmits K data packets after the PDCP PDU sequence number is SN.

In a fifth aspect, an embodiment of the present application provides a computer storage medium, where the computer storage medium stores a program, and when the program is executed, the terminal device executes any one of the data transmission methods described in the first aspect.

In a sixth aspect, an embodiment of the present application provides a computer storage medium, where the computer storage medium stores a program, and when the program is executed, the terminal device executes any one of the data transmission methods described in the second aspect above.

In a seventh aspect, an embodiment of the present application provides a computer storage medium, where the computer storage medium stores a program, and when the program is executed, the terminal device executes any one of the data transmission methods described in the third aspect.

In an eighth aspect, an embodiment of the present application provides a computer storage medium, where the computer storage medium stores a program, and when the program is executed, the terminal device executes any one of the data transmission methods described in the fourth aspect.

In a ninth aspect, an embodiment of the present application provides a first network device, where the first network device has a function of implementing the behavior of the first network device in the example of the data transmission method described in the first aspect. The functions can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

In a tenth aspect, an embodiment of the present application provides a second network device, where the second network device has a function of implementing the behavior of the second network device in the data transmission method example described in the second aspect. The functions can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

In an eleventh aspect, an embodiment of the present application provides a first network device, where the first network device has a function of implementing the behavior of the first network device in the data transmission method example described in the third aspect. The functions can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

In a twelfth aspect, an embodiment of the present application provides a terminal device, where the terminal device has a function of implementing the behavior of the terminal device in the example of the data transmission method described in the fourth aspect. The functions can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

In a thirteenth aspect, an embodiment of the present application provides a first network device, where the first network device may include a receiver, a processor, and a memory, and the processor is configured to support the first network device to execute the first aspect. The corresponding function of the first network device in the data transmission method. The receiver is used to communicate with other devices. The memory is for coupling with the processor, and stores necessary program instructions and data for the first network device.

In a fourteenth aspect, an embodiment of the present application provides a second network device, where the second network device may include a transmitter, a processor, and a memory, and the processor is configured to support the second network device to perform the execution of the second aspect. The corresponding function of the second network device in the data transmission method. The transmitter is used to communicate with other devices. The memory is for coupling with the processor, and stores necessary program instructions and data for the second network device.

In a fifteenth aspect, an embodiment of the present application provides a first network device, where the first network device may include a transmitter, a processor, and a memory, and the processor is configured to support the first network device to execute the third aspect. The corresponding function of the first network device in the data transmission method. The transmitter is used to communicate with other devices. The memory is for coupling with the processor, and stores necessary program instructions and data for the first network device.

In a sixteenth aspect, an embodiment of the present application provides a terminal device. The terminal device may include a receiver, a processor, and a memory, and the processor is configured to support the terminal device to perform the data transmission method in the fourth aspect. corresponding function. The receiver is used to communicate with other devices. The memory is for coupling with the processor, and stores necessary program instructions and data for the first network device.

In a seventeenth aspect, an embodiment of the present application provides a computer program product containing instructions, which, when run on a computer, causes the computer to execute the data transmission method described in the first aspect.

In an eighteenth aspect, an embodiment of the present application provides a computer program product containing instructions, which, when executed on a computer, cause the computer to execute the data transmission method described in the second aspect.

In a nineteenth aspect, an embodiment of the present application provides a computer program product including instructions, which, when run on a computer, causes the computer to execute the data transmission method described in the third aspect.

In a twentieth aspect, the embodiments of the present application provide a computer program product including instructions, which, when executed on a computer, cause the computer to execute the data transmission method described in the fourth aspect.

In a twenty-first aspect, an embodiment of the present application provides a chip system, where the chip system includes a processor for the first network device to implement the functions involved in the first aspect above, for example, to generate or process the functions involved in the above method. the data and/or information involved.

In one design solution, the chip system further includes a memory for storing necessary program instructions and data of the first network device. The chip system may be composed of chips, or may include chips and other discrete devices.

In a twenty-second aspect, an embodiment of the present application provides a chip system, where the chip system includes a processor for a second network device to implement the functions involved in the second aspect above, for example, generating or processing the functions involved in the above method. the data and/or information involved.

In one design solution, the chip system further includes a memory, and the memory is used for storing necessary program instructions and data of the second network device. The chip system may be composed of chips, or may include chips and other discrete devices.

In a twenty-third aspect, an embodiment of the present application provides a chip system, where the chip system includes a processor for the first network device to implement the functions involved in the third aspect above, for example, to generate or process the functions involved in the above method. the data and/or information involved.

In one design solution, the chip system further includes a memory for storing necessary program instructions and data of the first network device. The chip system may be composed of chips, or may include chips and other discrete devices.

In a twenty-fourth aspect, an embodiment of the present application provides a chip system, where the chip system includes a processor for a terminal device to implement the functions involved in the fourth aspect above, for example, generating or processing the functions involved in the above method. data and/or information.

In a design solution, the chip system further includes a memory for storing necessary program instructions and data of the terminal device. The chip system may be composed of chips, or may include chips and other discrete devices.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the accompanying drawings required in the embodiments or the background technology of the present application will be described below.

1 is a schematic structural diagram of a data transmission system disclosed in an embodiment of the present application;

2 is a schematic flowchart of a data transmission method disclosed in an embodiment of the present application;

3 is a schematic structural diagram of another data transmission system disclosed in an embodiment of the present application;

4 is a schematic flowchart of another data transmission method disclosed in an embodiment of the present application;

5 is a schematic structural diagram of a user plane protocol stack disclosed in an embodiment of the present application;

6 is a schematic structural diagram of another user plane protocol stack disclosed in an embodiment of the present application;

7 is a schematic flowchart of another data transmission method disclosed in an embodiment of the present application;

8 is a schematic flowchart of another data transmission method disclosed in an embodiment of the present application;

FIG. 9 is a schematic structural diagram of a first network device disclosed in an embodiment of the present application;

FIG. 10 is a schematic structural diagram of another first network device disclosed in an embodiment of the present application;

FIG. 11 is a schematic structural diagram of a second network device disclosed in an embodiment of the present application;

FIG. 12 is a schematic structural diagram of another second network device disclosed in an embodiment of the present application;

FIG. 13 is a schematic structural diagram of a terminal device disclosed in an embodiment of the present application;

FIG. 14 is a schematic structural diagram of another terminal device disclosed in an embodiment of the present application.

Detailed ways

The embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

In order to better understand the data transmission method, network device, and terminal device disclosed in the embodiments of the present application, the data transmission system implemented in the present application is first described below. Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a data transmission system disclosed in an embodiment of the present application. The data transmission system may include a terminal device, a relay node (integrated access and bachhaul node, IAB node), and a host base station (for example, an IAB node). donor), for example, the relay nodes in FIG. 1 include: a first relay node (for example, IAB node 1), a second relay node (for example, IAB node 2), a third relay node (for example, IAB node 3), A fourth relay node (eg IAB node 4). The terminal device establishes a communication connection with the IAB node 1, the IAB node 1 establishes a communication connection with the IAB node 2 and the IAB node 3 respectively, the IAB node 2 establishes a communication connection with the IAB node 4, and the IAB node 3 establishes a communication connection with the IAB node 4, The IAB node 4 establishes a communication connection with the IABdonor. The link between the IAB node 4 and the IAB donor may be a backhaul (Backhaul, BH) link, and the link between the terminal device and the IAB node 1 may be an access (Access, AC) link.

For ease of description, the meanings of terms in this application are defined below:

Uplink transmission: The device transmits data or signals to the network, and the device includes terminals, IAB nodes, etc.

Downlink transmission: The device receives data or signals transmitted by the network. Likewise, the device includes terminals, IAB nodes, etc.

Upper-level node: a node that receives data or signals during uplink transmission, or a node that sends data or signals during downlink transmission. For example, IAB node 1 is the upper-level node of the terminal device, and IAB node 2 is the upper-level node of IAB node 1. analogy. It should be understood that during uplink transmission, the nodes that perform data forwarding after the sending node are called upper-level nodes, that is, upper-level nodes are not limited to directly upper-level nodes, and direct-upper nodes refer to nodes that directly receive data during uplink transmission, not After forwarding by other nodes, or during downlink transmission, the data receiving node is the direct data sending node without forwarding by other nodes.

Subordinate node: a node that sends data or signals during uplink transmission, or a node that receives data or signals during downlink transmission. For example, IAB node 1 is the subordinate node of IAB node 2, and IAB node 2 is the subordinate node of IAB node 4. It should be understood that during uplink transmission, all nodes that send or forward data to the data receiving node through the data sending node are called subordinate nodes, that is, subordinate nodes are not limited to direct subordinate nodes, and direct subordinate nodes refer to the data sent during uplink transmission. A node that is directly received by the receiving node without being forwarded by other nodes, or a node that receives data directly without being forwarded by other nodes during downlink transmission.

When the terminal equipment transmits uplink data to the IAB donor, in a possible implementation manner, the terminal equipment can transmit the data to the IAB donor through IAB node 1, IAB node 2 and IAB node 4 in sequence, wherein IAB node 1 is the terminal equipment's data. The superior node (ie the parent node), IAB node 2 is the superior node of IAB node 1, IAB node 4 is the superior node of IAB node 2, and IAB donor is the superior node of IAB node 4. In another possible implementation manner, the terminal device can transmit data to the IABdonor via IAB node 1, IAB node 3 and IAB node 4 in sequence, where IAB node 1 is the upper-level node of the terminal device, and IAB node 3 is IAB node 1 The superior node of IABnode 4 is the superior node of IAB node 3, and the IAB donor is the superior node of IAB node 4. Further, the network device sends the data to a User Plane Function (UPF), a serving gateway (SGW) device, or a public data network gateway (PGW) device in the 5G network. one or more of.

After receiving the downlink data from the UPF, SGW equipment or PGW equipment, the IAB donor can transmit the downlink data to the terminal equipment. In a possible implementation manner, the IAB donor can transmit the data sequentially through IAB node 4, IAB node 2 and IAB node 1 is transmitted to the terminal equipment, wherein IAB node 4 is the superior node of IAB donor, IABnode 2 is the superior node of IAB node 4, IAB node 1 is the superior node of IAB node 2, and the terminal equipment is the superior node of IABnode 1. In another possible implementation, the IAB donor can transmit the data to the terminal equipment via IAB node4, IAB node 3 and IAB node 1 in sequence, wherein IAB node 4 is the upper node of the IAB donor, and IAB node 3 is the IAB node 4 The upper-level node of IAB node 1 is the upper-level node of IAB node 3, and the terminal device is the upper-level node of IAB node 1.

Usually, in order to ensure reliable transmission of data, the function of ARQ is included in the RLC protocol. ARQ checks the sender's data at the data receiver to confirm whether the transmission is correct. If the sender's data is received correctly, it sends an acknowledgement (ACK) signal to the sender. If the data is sent by the sender, a Not-acknowledgement (NACK) signal is sent to the sender. Verifying the data includes performing CRC verification on the data or not receiving a certain data packet within a certain period of time. For example, if the second relay node fails to receive the data sent by the first relay node, it sends a NACK signal to the second node to the first node. After receiving the NACK, the first node retransmits the data through ARQ. The automatic repeat request may include hop-by-hop ARQ and end-to-end ARQ.

Hop-by-hop ARQ means that the transmission result is immediately fed back to the sender for each received data packet. For example, the second relay node will decode the first data from the first relay node after receiving it. If the decoding is successful , the ACK signal is returned; if the decoding fails, the NACK signal is returned. After the first relay node receives the ACK signal from the second relay node, it sends the second data to the second relay node, and deletes the first data from the cache of the first relay node; in the first relay node When the successor node receives the NACK signal from the second relay node, the first relay node resends the first data. Exemplarily, the cache in this embodiment of the present application may be an RLC cache.

End-to-end ARQ means that the intermediate node does not decode and feed back the received data. After the intermediate node receives the data, it forwards the received data. After the data receiving target node receives the data, it verifies the received data. And feedback the receiving result to the sending source of the data. If the target node of data reception fails to check or waits for too long, it will feedback NACK, and if the data is received correctly, it will feedback ACK.

In hop-by-hop ARQ, when the first relay node receives the ACK signal from the second relay node, it deletes the data that has been successfully decoded by the second relay node from the cache of the first relay node. After the feedback, the second relay node has a link abnormality, and the data successfully decoded by the second relay node cannot continue to be sent to the superior node, that is, the data sent by the first relay node to the second relay node cannot be sent to the first relay node. Resume or retransmit.

For end-to-end ARQ, since the intermediate node does not feed back ACK/NACK signals, only the receiver will feed back ACK/NACK signals. If the target node receiving the data feeds back NACK signals, the sender cannot determine the specific faulty link. Retransmitting data to the target node through the original intermediate nodes may also lead to data failure, which will lead to waste of air interface transmission resources of the intermediate nodes and reduce the utilization rate of air interface resources.

In this embodiment of the present application, the first network device receives the first configuration information of the second network device, and the first network device determines whether to perform ARQ feedback according to the first configuration information. The first network device may be the IAB node in FIG. 1 , for example, may be IAB node 1 or IAB node 4, and the second network device may be the IAB donor in FIG. 1 . The first configuration information includes at least one of the following information: ARQ feedback information of the first bearer, node identification of the first network device, identification of the first bearer, identification of terminal equipment, logical channel identification, and ARQ target node identification. In this embodiment of the present application, a relay node that needs to perform ARQ feedback can be configured based on the IAB donor, and other relay nodes in the transmission path can directly forward the data sent by the lower-level node to the upper-level node, and can perform data retransmission recovery across multiple hops , and there is no need for the sender to re-send data to the receiver through each intermediate node, thereby improving the utilization of air interface resources. Wherein, when the sending end is a terminal device, the receiving end can be an IAB donor; when the sending end is an IAB donor, the receiving end can be a terminal device.

The technical solutions of the embodiments of the present invention can be applied to various communication systems, for example, a Global System of Mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (Wideband) system Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (Long Term Evolution, LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (Time Division Duplex, TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, 5th-Generation (5G) communication system or 5G New Radio (New Radio, NR) communication system, etc.

In this embodiment of the present invention, the IAB donor may be a device for communicating with a mobile station, and may specifically be an Access Point (AP), an Access Point (AP) in a Wireless Local Area Network (Wireless Local Area Networks, WLAN), a Global System for Mobile Communications ( Base Transceiver Station (BTS) in Global System for Mobile Communication (GSM) or Code Division Multiple Access (Code Division Multiple Access, CDMA), and in Wideband Code Division Multiple Access (WCDMA) Base station (NodeB, NB), evolved base station (Evolutional Node B, eNB) in LTE system, relay station or access point, in-vehicle equipment, wearable equipment, access network equipment in future 5G network and future evolution of public land Any of the access network equipment in the mobile network (Public Land Mobile Network, PLMN).

The terminal equipment may also be referred to as User Equipment (UE), mobile station, access terminal, subscriber unit, subscriber station, mobile station, remote station, remote terminal, mobile device, terminal, wireless communication device, user agent or user equipment, etc., which may specifically be a station (Station, ST) in a WLAN, a cellular phone, a cordless phone, a Session Initiation Protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, Personal Digital Assistant (PDA), handheld devices with wireless communication capabilities, computing devices, other processing devices connected to wireless modems, in-vehicle devices, wearable devices, mobile stations in future 5G networks, and future evolved PLMNs Any of the terminal equipment in the network, etc.

Based on the data transmission system shown in FIG. 1, please refer to FIG. 2. FIG. 2 is a data transmission method provided by an embodiment of the present application. The method includes but is not limited to the following steps:

Step S201: The second network device sends first configuration information to the first network device.

Taking the data transmission system shown in FIG. 1 as an example, if the terminal device transmits uplink data to the IAB donor (that is, the second network device) via IAB node 1, IAB node 2 and IAB node 4, the first network device can be IAB node1, The third network device may be IAB node 2 or IAB node 4; or the first network device may be IAB node 2, the third network device may be IAB node 4, and the third network device is an upper-level node of the first network device. Before the terminal device transmits the uplink data to the IAB donor, the IAB donor may send the first configuration information to the first network device. In a possible implementation manner, before the terminal equipment transmits the uplink data to the IAB donor, the IAB donor may send the data to all or some intermediate nodes (ie, one or more of IAB node 1, IAB node 2 and IAB node 4) respectively. first configuration information.

Taking the data transmission system shown in FIG. 1 as an example, if the IAB donor transmits downlink data to the terminal device via IAB node 4, IAB node 2 and IAB node 1, the first network device may be IAB node 4, and the third network device may be IAB node 2 or IAB node 1; or the first network device may be IAB node 2, the third network device may be IAB node 1, and the third network device is a subordinate node of the first network device. Before the IAB donor transmits downlink data to the terminal device, the IAB donor may send the first configuration information to the IAB node 4 . In a possible implementation manner, before the IAB donor transmits downlink data to the terminal equipment, the IAB donor may send the data to all or some intermediate nodes (ie, one or more of IAB node 4, IAB node 2 and IAB node 1) respectively. first configuration information.

The first configuration information may include at least one of the following information: ARQ feedback information of the first bearer, node identification of the first network device, identification of the first bearer, identification of the terminal device, logical channel identification, ARQ target node logo. The first bearer may include a data radio bearer (DRB) for the terminal device, a signaling radio bearer (SRB) for the terminal device, or a radio bearer (RB) for the IAB donor. The node identifier of the first network device may be a protocol (internet protocol, IP) address or a media access control (media access control, MAC) address of interconnection between networks of the first network device, and is used to uniquely identify the first network equipment, this application does not limit the node identifier. The identifier of the first bearer may be an identification number (identification, ID) of the first bearer, which is used to uniquely identify the first bearer. The identification of the terminal equipment may be the IP address, MAC address, international mobile equipment identity (IMEI) of the terminal equipment, or an international mobile subscriber identity (IMSI), etc., which are used to uniquely identify the terminal equipment. , this application does not limit the identification of the terminal device. The logical channel identifier may be an ID of the logical channel, which is used to uniquely identify the logical channel, and the logical channel of the terminal device corresponds to the bearer one-to-one. The ARQ target node identifier may include the node identifier of the intermediate node that needs to perform ARQ feedback, and the node identifier may be node name, IP address, MAC address, Physical Cell Identifier (PCI), Cell Global Identifier (Cell Global Identifier) , CGI) or number global cell identifier (NR Cell GlobalIdentifier, NCGI), etc., are used to uniquely identify the intermediate node.

The ARQ feedback information of the first bearer may include one of end-to-end feedback, hop-by-hop feedback, and feedback indication, and the feedback indication is used to instruct the first network device to perform ARQ feedback on the data of the first bearer or to perform ARQ feedback on the first bearer. The data does not perform ARQ feedback. The end-to-end feedback or the hop-by-hop feedback may be configured by default in the system or configured by the second network device, which is not specifically limited by the embodiments of the present application.

Since the first configuration information is configured for the first bearer and can be configured for each IAB node, two IAB nodes can be used as endpoints on the first bearer, that is, the two IAB nodes perform ARQ feedback. The sender and the receiver, and the IAB node between the two IAB nodes does not need to perform ARQ feedback, but only needs to perform data forwarding, which makes the ARQ configuration more flexible. For example, IAB node 1 and IAB node 4 may be configured as the receiver and sender of ARQ feedback. After receiving the first bearer data sent by IAB node 1, IAB node 4 determines to perform ARQ feedback according to the first configuration information, The IAB node 1 receives the feedback sent by the IAB node 4, and the IAB node 2 between the IAB node 1 and the IAB node 4 does not need to perform feedback, but only needs to perform data forwarding.

The ARQ feedback information of the first configuration information corresponds to one or more first bearers of the terminal device, or corresponds to all bearers of the terminal device. The number of terminal devices in this embodiment of the present application may be one or more, which is not limited in the present application. Since a terminal device can have multiple bearers, one or part of the bearers can be designated to perform ARQ feedback and/or reception on a certain IAB node, or it can be designated to perform ARQ feedback and/or reception on all bearers of a certain terminal device. Or receiving, that is, the granularity of ARQ feedback and/or receiving is configurable, which depends on the implementation and is not limited in this application.

Step S202: The first network device receives data of the third network device.

Taking the data transmission system shown in Figure 1 as an example, if a terminal device transmits uplink data to an IAB donor via IAB node 1, IAB node 2 and IAB node 4, the first network device is IAB node 1, and the third network device is the terminal device. , the IAB donor sends the first configuration information to the IAB node 1. After the terminal device sends the uplink data of the first bearer to the IAB node 1, the IAB node 1 may receive the uplink data of the first bearer of the terminal device. If the terminal device transmits uplink data to the IAB donor via IAB node 1, IAB node 2 and IAB node 4, the first network device is IAB node 2, the third network device is IAB node 1, and the IAB donor sends the first configuration information to IAB node 2 . After the terminal device sends the uplink data of the first bearer to the IAB node 2 through the IAB node 1, the IAB node 2 may receive the uplink data of the first bearer of the IAB node 1.

Taking the data transmission system shown in FIG. 1 as an example, if an IAB donor transmits downlink data to a terminal device via IAB node 4, IAB node 2 and IAB node 1, the first network device is IAB node 4, and the third network device is IABdonor, The IAB donor sends the first configuration information to the IAB node 4 . After the IAB donor sends the downlink data of the first bearer to the IAB node 4, the IAB node 4 receives the downlink data of the first bearer of the IAB donor. If the IAB donor transmits downlink data to the terminal device via IAB node 4, IAB node 2 and IAB node 1, the first network device is IAB node 2, the third network device is IAB node 4, and the IAB donor sends the first configuration information to IAB node 2 . After the IABdonor sends the downlink data of the first bearer to the IAB node 2 through the IAB node 4, the IAB node 2 receives the downlink data of the first bearer of the IAB node 4.

Step S203: The first network device determines whether to perform ARQ feedback according to the first configuration information.

In a possible implementation manner, if the ARQ feedback information includes end-to-end feedback, if the identifier of the first network device is the same as the ARQ target node identifier, the first network device sends ARQ feedback, if the identifier of the first network device and the ARQ If the target node identifiers are different, the first network device does not perform ARQ feedback and forwards the data carried by the first bearer.

Specifically, after receiving the data sent by the third network device, the first network device determines whether the bearer corresponding to the received data is configured according to the first configuration information. If the bearer corresponding to the data is configured, it is determined according to the ARQ feedback information of the first bearer of the first bearer in the first configuration information whether ARQ feedback is required, and if feedback is required, ARQ ACK or NACK is performed according to the result of data reception feedback; or, if the ARQ target node identifier in the first configuration information is the same as the node identifier of the first network device, feedback is also required. If the first network device does not need to perform ARQ feedback on the received data, data forwarding is performed according to the ARQ target node identifier in the first configuration information.

It should be understood that if the ARQ feedback mode of the first network device is the default, that is, the end-to-end ARQ feedback or the hop-by-hop ARQ feedback mode is the default, as defined by the protocol, the ARQ feedback information of the first bearer is not required. , the IAB node only needs to determine whether to feed back according to the ARQ target node identifier and the default ARQ feedback mode. Specifically, if the default ARQ feedback mode is the end-to-end mode, then when the node ID of the IAB node is different from the ARQ target node ID, the data is forwarded; if the default ARQ feedback mode is hop-by-hop feedback, the IAB node will respond to all data. Perform ARQ feedback.

Taking the data transmission system shown in Figure 1 as an example, if a terminal device transmits uplink data to an IAB donor via IAB node 1, IAB node 2 and IAB node 4, the first network device is IAB node 1, and the third network device is the terminal device. , the IAB node 1 determines, based on the first configuration information, that the ARQ feedback information includes end-to-end feedback, and the ARQ target node is identified as an IAB donor. After receiving the uplink data of the first bearer of the terminal device, the IAB node 1 does not perform ARQ feedback, but directly forwards the uplink data of the first bearer to the IAB node 2. Since IAB node 2 is not the target node, IAB node 2 does not perform ARQ feedback, but directly forwards the uplink data of the first bearer to IAB node 4. Similarly, after receiving the data, IAB node 4 forwards the data to the IAB donor, IAB The donor can decode the received data. If the decoding is successful, the IAB donor sends an ACK signal to the terminal device; if the decoding fails, the IAB donor sends a NACK signal to the terminal device, and the IAB node 1 can select a new transmission path for data retransmission.

In the embodiment of the present application, since the sending end of the data will save the sent data in the cache, if unacknowledged feedback is received, the data can be retransmitted to ensure reliable data transmission.

Taking the data transmission system shown in FIG. 1 as an example, if an IAB donor transmits downlink data to a terminal device via IAB node 4, IAB node 2 and IAB node 1, the first network device is IAB node 4, and the third network device is IABdonor, The IAB node 4 determines, based on the first configuration information, that the ARQ feedback information includes end-to-end feedback, and the ARQ target node is identified as a terminal device. After the IAB node 4 receives the downlink data of the first bearer of the IAB donor, the IAB node 4 does not perform ARQ feedback, but forwards the downlink data of the first bearer to the IAB node 2 . IAB node 2 also does not perform ARQ feedback, and forwards the downlink data of the first bearer to IAB node 1. After receiving the data, the IAB node 1 also forwards the data to the terminal equipment, and the terminal equipment decodes the received data. If the decoding succeeds, the terminal equipment sends an ACK signal to the IAB donor; if the decoding fails, the terminal equipment sends an ACK signal to the IAB donor. NACK signal. After the IAB donor receives the NACK signal, it retransmits the data.

In this embodiment of the present application, reliable transmission of end-to-end data can be guaranteed.

In a possible implementation manner, if the ARQ feedback information includes hop-by-hop feedback, the first network device sends ARQ feedback when receiving the data carried by the first bearer.

Taking the data transmission system shown in FIG. 1 as an example, if the terminal device transmits uplink data to the IAB donor via IAB node 1, IAB node 2 and IAB node 4, the first network device is IAB node 4, and the third network device is IAB node 2 , the IAB donor sends the first configuration information to the IAB node 4, the IAB node 4 determines that the ARQ feedback information includes hop-by-hop feedback based on the first configuration information, and the ARQ target node is identified as the IAB donor. After the terminal device sends the uplink data of the first bearer to the IAB node 1, the IAB node 1 feeds back ACK or NACK to the terminal device. If the decoding is successful, the IAB node1 forwards the uplink data of the first bearer to the IAB node 2. The IAB node 2 feeds back an ACK or NACK to the IAB node 1. If the decoding is successful, the IAB node 2 forwards the uplink data of the first bearer to the IAB node 4. After receiving the data, IAB node 4 sends ACK or NACK to IAB node 2, and if decoding is successful, it forwards the data to the IAB donor. Each IAB node deletes the corresponding data in the cache after receiving the ACK signal sent by the superior node, and resends the data if it receives the NACK signal sent by the superior node.

In this embodiment of the present application, since ARQ feedback is performed hop-by-hop, retransmission on the entire transmission path can be avoided, transmission resources are saved, and transmission efficiency is improved.

Taking the data transmission system shown in Fig. 1 as an example, if an IAB donor transmits downlink data to a terminal device via IAB node 4, IAB node 2 and IAB node 1, the first network device is IAB node 1, and the IAB donor sends the first data to IAB node 1. Configuration information, the IAB node 1 determines, based on the first configuration information, that the ARQ feedback information includes hop-by-hop feedback, and the ARQ target node is identified as a terminal device. After the IAB donor sends the downlink data of the first bearer to the IAB node 4, the IABnode 4 feeds back ACK or NACK to the IAB donor, and if the decoding is successful, it forwards the downlink data of the first bearer to the IABnode 2. IAB node 2 feeds back ACK or NACK to IAB node 4, and if decoding is successful, it forwards the downlink data of the first bearer to IAB node 1. After IAB node 1 receives the data, it feeds back ACK or NACK to IAB node 2, and if decoding is successful, it forwards the downlink data of the first bearer to the terminal device. Each IAB node deletes the corresponding data in the cache after receiving the ACK signal sent by the superior node, and resends the data if it receives the NACK signal sent by the superior node.

In this embodiment of the present application, since ARQ feedback is performed hop-by-hop, retransmission on the entire transmission path can be avoided, transmission resources are saved, and transmission efficiency is improved.

In a possible implementation manner, if the ARQ feedback information includes a feedback indication, the first network device determines whether to perform ARQ feedback on the first bearer data according to the feedback indication. At this time, the IAB node determines whether to feed back the data of the first bearer according to the feedback indication. Unlike end-to-end and hop-by-hop feedback, ARQ feedback based on feedback indication can be configured for any node, and two IAB nodes can be configured as end nodes for ARQ feedback, and the IAB node between the two end nodes does not need to be Perform ARQ feedback. The so-called end node refers to a pair of nodes that need to perform ARQ feedback and ARQ reception. The end node may be determined by the identifier of the first bearer, the identifier of the terminal device, and the ARQ feedback information of the first bearer. If the IAB node is configured to perform ARQ feedback on a certain bearer of a certain terminal equipment, it is an end node.

Taking the data transmission system shown in FIG. 1 as an example, if a terminal device transmits uplink data to an IAB donor via IAB node 1, IAB node 2 and IAB node 4, the first network device is IAB node 1, and IAB node 1 is based on the first configuration The information determines that the ARQ feedback information includes a feedback indication, where the feedback indication is used to instruct the first network device to perform ARQ feedback on the first bearer of the terminal device. Then, after receiving the uplink data of the first bearer of the terminal device, the IAB node 1 feeds back ACK or NACK to the terminal device. If the decoding is successful, the IAB node 1 forwards the uplink data of the first bearer to IABnode 2, and responds to the received uplink data. data is cached. Since the feedback indication is used to instruct IAB node 2 not to perform ARQ feedback, IAB node 2 may not perform ARQ feedback, but directly forward the uplink data of the first bearer to IAB node 4. Since the feedback indication is used to instruct the IAB node 4 to perform ARQ feedback, after receiving the data, the IAB node 4 can decode the received data. If the decoding is successful, the IAB node 4 sends an ACK signal to the IAB node 2 or IAB node 1; if If decoding fails, IAB node 4 sends a NACK signal to IAB node 2 or IAB node 1, and IAB node 1 can select a new transmission path for data retransmission.

In this embodiment of the present application, if IAB node 4 sends a NACK signal to IAB node 2, IAB node 2 may send the NACK signal to IAB node 1, and IAB node 1 may select a new transmission path for data retransmission, for example, IAB node 1 The data is transmitted to the IAB donor via IAB node 3 and IAB node 4, and the terminal equipment does not need to retransmit the data to the IAB donor via each intermediate node, which can improve the utilization of air interface resources.

Taking the data transmission system shown in FIG. 1 as an example, if the IAB donor transmits downlink data to the terminal device via IAB node 4, IAB node 2 and IAB node 1, the first network device is IAB node 4, and IAB node 4 is based on the first configuration The information determines that the ARQ feedback information includes a feedback indication, where the feedback indication is used to instruct the first network device to perform ARQ feedback. After receiving the downlink data of the first bearer of the IAB donor, the IAB node 4 feeds back ACK or NACK to the IAB donor. If the IAB node 4 successfully decodes the downlink data of the first bearer, it forwards the downlink data of the first bearer to the IAB node 2 and buffers the data. Since the feedback indication is used to instruct IAB node 2 not to perform ARQ feedback, IAB node 2 may not perform ARQ feedback, but directly forward the downlink data of the first bearer to IAB node 1. Since the feedback indication is used to instruct IAB node 1 to perform ARQ feedback, after IAB node 1 receives the data, it can decode the received data. If the decoding is successful, IAB node 1 sends an ACK signal to IAB node 2 or IAB node 4; if decoding is successful, IAB node 1 sends an ACK signal to IAB node 2 or IAB node 4 If it fails, IAB node 1 sends a NACK signal to IAB node 2 or IAB node 4, and IAB node 4 can select a new transmission path for data retransmission.

In this embodiment of the present application, if IAB node 1 sends a NACK signal to IAB node 2, IAB node 2 can send the NACK signal to IAB node 4, and IAB node 4 can select a new transmission path for data retransmission, for example, IAB node 4 The data is transmitted to the terminal equipment through IAB node 3 and IAB node 1, and the IAB donor does not need to retransmit the data to the terminal equipment through each intermediate node, which can improve the utilization of air interface resources.

In a possible implementation manner, the first configuration information may further include a transmission direction indication, and the transmission direction indication includes uplink transmission or downlink transmission. If the transmission direction indication includes uplink transmission, the first network device determines whether to perform ARQ feedback according to the first configuration information only when receiving uplink data. If the transmission direction indication includes downlink transmission, the first network device determines whether to perform ARQ feedback according to the first configuration information only when receiving downlink data. The transmission direction indication may be configured for one bearer, or multiple bearers, or all bearers of a terminal device. It should be understood that, due to different transmission directions, the uplink transmission path and downlink transmission path of the equipment of the same terminal may be different, and the paths of ARQ feedback and data transmission directions should be the same, but in opposite directions. Because the paths of uplink data transmission and downlink data transmission may not have the same IAB node, and the feedback is for data transmission, the path of ARQ feedback needs to be the same as the path of data transmission, but in the opposite direction.

In the method described in FIG. 2 , the second network device sends first configuration information to the first network device, the first network device receives data of the third network device, and the first network device determines whether to perform ARQ feedback according to the first configuration information , which can effectively realize data retransmission and improve the utilization of air interface resources.

Please refer to FIG. 3. FIG. 3 is a schematic structural diagram of a data transmission system disclosed in an embodiment of the present application. The data transmission system may include a terminal device, an IAB node, and a donor base station (for example, an IAB donor). For example, the middle The relay nodes include: a first relay node (eg, IAB node 1), a second relay node (eg, IAB node 2), and a third relay node (eg, IAB node 3). The terminal equipment establishes a communication connection with IAB node 3, IAB node 3 establishes communication connection with IAB node 2 and IAB node 1 respectively, IAB node 2 establishes communication connection with IAB donor, and IAB node 1 establishes communication connection with IAB donor. The link between IAB node 2 and the IAB donor may be a BH link, the link between IAB node 1 and the IAB donor may be a BH link, and the link between the terminal equipment and IAB node 3 may be an AC link.

When the terminal equipment transmits uplink data to the IAB donor, in a possible implementation manner, the terminal equipment can transmit the data to the IAB donor through IAB node 3 and IAB node 2 in turn, wherein IAB node 3 is the upper-level node of the terminal equipment (ie parent node), IAB node 2 is the upper node of IAB node 3, and IAB donor is the upper node of IAB node 2. In another possible implementation manner, the terminal device may transmit data to the IAB donor via IAB node 3 and IAB node 1 in sequence, where IAB node 3 is the upper-level node of the terminal device, IAB node 1 is the upper-level node of IAB node 3, and IAB The donor is the upper-level node of IAB node 1. Further, the IAB donor can send the uplink data to the GW equipment.

After the IAB donor receives the downlink data from the gateway device, it can transmit the downlink data to the terminal device. In a possible implementation, the IAB donor can transmit the data to the terminal device via IAB node 2 and IAB node 3 in turn, wherein the IAB The node 2 is the upper node of the IAB donor, the IAB node 3 is the upper node of the IAB node 2, and the terminal device is the upper node of the IAB node 3. In another possible implementation manner, the IAB donor can transmit data to the terminal device via IAB node 1 and IAB node 3 in sequence, where IAB node 1 is the upper-level node of the IAB donor, and IAB node 3 is the upper-level node of IAB node 1 , the terminal device is the upper-level node of IAB node 3.

Generally, in order to ensure reliable transmission of data, the function of automatic repeat request ARQ is included in the RLC protocol. ARQ checks the sender's data at the data receiver to confirm whether the transmission is correct. If the sender's data is received correctly, it sends an ACK signal to the sender. If the receiver cannot receive the sender's data correctly, Then a NACK signal is sent to the sender. Verifying the data includes performing CRC verification on the data or not receiving a certain data packet within a certain period of time. For example, if the second relay node fails to receive the data sent by the first relay node, it sends a NACK signal to the second node to the first node. After receiving the NACK, the first node retransmits the data through ARQ. The automatic repeat request may include hop-by-hop ARQ and end-to-end ARQ.

Hop-by-hop ARQ means that the transmission result is immediately fed back to the sender for each received data packet. For example, the second relay node will decode the first data from the first relay node after receiving it. If the decoding is successful , the ACK signal is returned; if the decoding fails, the NACK signal is returned. After the first relay node receives the ACK signal from the second relay node, it sends the second data to the second relay node, and deletes the first data from the cache of the first relay node; in the first relay node When the successor node receives the NACK signal from the second relay node, the first relay node resends the first data.

End-to-end ARQ means that the intermediate node does not decode and feed back the received data. After the intermediate node receives the data, it forwards the received data. After the data receiving target node receives the data, it verifies the received data. And feedback the receiving result to the sending source of the data. If the target node of data reception fails to check or waits for too long, it will feedback NACK, and if the data is received correctly, it will feedback ACK.

In hop-by-hop ARQ, when the first relay node receives the ACK signal from the second relay node, it deletes the data that has been successfully decoded by the second relay node from the cache of the first relay node. After the feedback, the second relay node has a link abnormality, and the data successfully decoded by the second relay node cannot continue to be sent to the superior node, that is, the data sent by the first relay node to the second relay node cannot be sent to the first relay node. Resume or retransmit.

For end-to-end ARQ, since the intermediate node does not feed back ACK/NACK signals, only the receiver will feed back ACK/NACK signals. If the target node receiving the data feeds back NACK signals, the sender cannot determine the specific faulty link. Retransmitting data to the target node through the original intermediate nodes may also lead to data failure, which will lead to waste of air interface transmission resources of the intermediate nodes and reduce the utilization rate of air interface resources.

In the embodiment of the present application, the first network device sends the return indication information to the third network device, and the return indication information is used to notify the third network device to receive the return data. data of the network device; the first network device sends back data to the third network device; the first network device is an upper-level node of the third network device. The first network device may be the IAB node 2 in FIG. 1 , and the third network device may be the IAB node 3 in FIG. 1 . IAB node 2 is the upper-level node of IAB node 3. In the hop-by-hop feedback, IAB node 3 sends data to IAB node 2, IAB node 2 successfully decodes the data, IAB node 2 sends an ACK signal to IAB node 3, and IAB node 3 deletes the data stored in the cache of IAB node 3. The IAB node 2 forwards the data to the IAB donor, the IAB donor fails to decode the data, the IAB donor sends a NACK signal to the IAB node 2, and the IAB node 2 can send the return instruction information to the IAB node 3, and send the IAB node 3 the data so that the IAB node 3 transmits the data to the IAB donor through other paths, for example, the IAB node 3 transmits the data to the IAB donor via the IAB node 1, and data retransmission recovery across multiple hops can be performed.

Based on the data transmission system shown in FIG. 3, please refer to FIG. 4. FIG. 4 is a data transmission method provided by an embodiment of the present application. The method includes but is not limited to the following steps:

Step S401: The first network device sends back transmission indication information to the third network device.

Taking the data transmission system shown in FIG. 3 as an example, if the terminal device transmits uplink data to the IAB donor via IAB node 3 and IAB node 2, the first network device can be IAB node 2, the third network device can be IAB node 3, and the third network device can be IAB node 3. A network device is an upper-level node of a third network device. In the hop-by-hop feedback, the IAB node 3 sends the uplink data to the IAB node 2, the IAB node 2 successfully decodes the uplink data, the IAB node 2 sends an ACK signal to the IAB node 3, and the IAB node 3 deletes the data stored in the cache of the IAB node 3. upstream data. The IAB node 2 forwards the uplink data to the IAB donor, and the IAB donor fails to decode the uplink data. The IAB donor sends a NACK signal to the IAB node 2, and the IAB node 2 can send the return instruction information to the IAB node 3. The return instruction information is used for The IAB node 3 is notified to receive the return data, and the return data is the above-mentioned uplink data.

Taking the data transmission system shown in FIG. 3 as an example, if the IAB donor transmits downlink data to the terminal equipment via IAB node 2 and IAB node 3, the first network equipment may be IAB node 2, the third network equipment may be IABdonor, the first network equipment The network device is a subordinate node of the third network device. In hop-by-hop feedback, the IAB donor sends downlink data to IAB node 2, IAB node 2 successfully decodes the downlink data, IAB node 2 sends an ACK signal to the IAB donor, and the IAB donor deletes the downlink data stored in the IAB donor's buffer. IAB node 2 forwards the downlink data to IAB node 3, IAB node 3 fails to decode the downlink data, IAB node 3 sends a NACK signal to IAB node 2, and IAB node 2 can send back instruction information to the IAB donor. The information is used to notify the IAB donor to receive the return data, which is the above-mentioned downlink data.

In a possible implementation manner, before the first network device sends the return indication information to the third network device, the first network device may receive the second configuration information forwarded by the IAB donor via the third network device, where the second configuration information includes The first indication information, where the first indication information is used to instruct the first network device to send back the indication information when receiving the NACK signal.

In specific implementation, when the IAB donor determines that the link is abnormal, it can actively generate the second configuration information, transmit the second configuration information to the third network device, and the third network device transmits the second configuration information to the first network. It can also be that the first network device sends the link abnormality indication information to the third network device, and after the third network device forwards the link abnormality indication information to the IAB donor, the IAB donor generates the second configuration information, and the second The configuration information is transmitted to the third network device, and the third network device transmits the second configuration information to the first network device.

In a possible implementation manner, when the third network device sends the second configuration information to the first network device, it needs to send configuration indication information to the first network device, otherwise the first network device may fail because its own uplink , and refuses to schedule the third network device for uplink transmission. Specifically, the configuration indication information may be random access (RandomAccess, RACH), scheduling request (Scheduling Request, SR), buffer state report (BufferStateReport, BSR), or pre-configured uplink grant (pre-configured UL grant), Specifically, it is not limited by the embodiments of the present application.

Step S402: The third network device sends feedback information to the first network device.

Taking the data transmission system shown in Figure 3 as an example, if the terminal device transmits uplink data to the IAB donor via IAB node 3 and IAB node 2, the first network device is IAB node 2, the third network device is IAB node 3, IAB node 2 After sending the return indication information to the IAB node 3, the IAB node 3 can detect whether the second configuration information of the IAB donor is received, and the second configuration information is used to indicate that the intermediate node is allowed to send the return indication information when receiving the NACK signal, if The IAB node 3 receives the second configuration information, and the IAB node 3 may send feedback information to the IAB node 2, and the IAB node 2 receives the feedback information.

Taking the data transmission system shown in Fig. 3 as an example, if the IAB donor transmits downlink data to the terminal equipment via IAB node 2 and IAB node 3, the first network equipment is IAB node 2, the third network equipment is the IAB donor, and the IAB node 2 to the terminal equipment. After the IAB donor sends the return indication information, the IAB donor can detect whether there is second configuration information. The second configuration information is used to indicate that the intermediate node is allowed to send the return indication information when receiving the NACK signal. If the second configuration information exists, the IAB The donor can send feedback information to the IAB node 2, and the IAB node 2 receives the feedback information.

Step S403: The first network device stops receiving data sent by the third network device.

Taking the data transmission system shown in FIG. 3 as an example, if the terminal equipment transmits uplink data to the IAB donor via IAB node 3 and IAB node 2, IAB node 3 sends feedback information to IAB node 2, and IAB node 2 can stop receiving IAB node 3 Upstream data sent.

Taking the data transmission system shown in Figure 3 as an example, if the IAB donor transmits downlink data to the terminal equipment via IAB node 2 and IAB node 3, the IAB donor sends feedback information to IAB node 2, and IAB node 2 can stop receiving the data sent by the IAB donor. Downlink data.

Step S404: The first network device sends back data to the third network device.

Taking the data transmission system shown in Figure 3 as an example, if the terminal equipment transmits uplink data to the IAB donor via IAB node 3 and IAB node 2, IAB node 3 sends feedback information to IAB node 2, and IAB node 2 can send back to IAB node 3. The data is transmitted, and the return data is the uplink data belonging to IAB node 3 that IAB node 2 fails to send.

Taking the data transmission system shown in Figure 3 as an example, if an IAB donor transmits downlink data to terminal equipment via IAB node 2 and IAB node 3, the IAB donor sends feedback information to IAB node 2, and IAB node 2 can send back data to IABdonor , the return data is the downlink data belonging to the IAB donor that IAB node 2 fails to send.

In a possible implementation manner, the third network device may transmit the backhaul data to the receiving end through other paths. Configure routing paths, for example, add new routing information based on the original routing information; or delete the original routing information and replace it with new routing information. Taking the data transmission system shown in FIG. 3 as an example, if the terminal equipment transmits uplink data to the IAB donor via IAB node 3 and IAB node 2, after IAB node 2 sends the backhaul data to IAB node 3, IAB node 3 can send the backhaul data via IAB node 1 transmits to IAB donor. Taking the data transmission system shown in Figure 3 as an example, if the IAB donor transmits downlink data to the terminal equipment via IAB node 2 and IAB node 3, after IAB node 2 sends the backhaul data to the IABdonor, the IAB donor can transmit the backhaul data via the IAB. node 1 and IAB node 3 are transmitted to the end device.

In a possible implementation manner, the first network device may reselect the upper-level node according to the network topology and routing information of the existing data transmission system, and transmit the data to the receiving end via the new upper-level node. Taking the data transmission system shown in FIG. 3 as an example, if the terminal device transmits uplink data to the IAB donor via IAB node 3 and IAB node 2, the first network device may be IAB node 2. In hop-by-hop feedback, the terminal device sends uplink data to IAB node 3, and IAB node 3 forwards the uplink data to IAB node 2. If IAB node 2 fails to decode the uplink data, IAB node 2 sends a NACK signal to IAB node 3. The IAB node 3 can re-select the upper node, for example, the IAB node 1 is used as a new upper node of the IAB node 3, and the IAB node 3 transmits the uplink data to the IAB donor via the IAB node 1. Taking the data transmission system shown in FIG. 3 as an example, if the IAB donor transmits downlink data to the terminal device via IAB node 2 and IAB node 3, the first network device may be IAB node 2. In the hop-by-hop feedback, the IAB donor sends the downlink data to the IAB node 2, the IAB node 2 fails to decode the downlink data, and the IAB node 2 sends a NACK signal to the IAB donor. The IAB donor can re-select a subordinate node, for example, IAB node 1 is used as a new subordinate node of the IAB donor, and the IAB donor transmits the downlink data to the terminal device via IAB node 1 and IAB node 3.

In a possible implementation manner, the first network device may use a node with a higher priority as the superior node of the first network device, and the first network device may also use the adjacent node designated by the IAB donor as the superior node of the first network device node. For example, the shorter the link distance from the IAB donor, the higher the priority of the node, and the first network device may regard the node with the shorter link distance from the IAB donor as the upper-level node of the first network device .

In a possible implementation manner, during the random access process or the first message after the access is completed, the first network device may send the cache status of the first network device to a new upper-level node of the first network device, For example, the original routing information, the link abnormality cause, the cause may be indicated by a cause value, and the definition of the specific cause value depends on the protocol, which is not limited in this application.

In a possible implementation manner, the first network device determines whether to start the corresponding process described in FIG. 4 according to one or more of the following possible conditions: within a preset time period, the first network device determines that the first network device The sum of the data volume of all data currently stored in the cache is greater than the preset data volume threshold; or within the preset time period, the quality of the backhaul link of the first network device is less than the preset quality threshold; or all candidate beams are less than the preset beam quality threshold; or beam failure; or radio link failure.

In the method described in FIG. 4 , the first network device sends back indication information to the third network device, the third network device sends feedback information to the first network device, and the first network device stops receiving uplink data sent by the third network device , and send back data to the third network device, which can effectively realize data retransmission.

Please refer to FIG. 5. FIG. 5 is a schematic structural diagram of a user plane protocol stack disclosed in an embodiment of the present application. The user plane of the user plane protocol stack includes UE, IAB-node 1, IAB-node 2, and IAB-donor. The protocol stack of the UE includes, from top to bottom, a Service Data Adaptation Protocol (SDAP) layer, a Packet Data Convergence Protocol (PDCP) layer, and a Radio Link Control (RLC) layer. ) layer and MAC layer. The protocol stack in which IAB-node 2 communicates with the UE includes the RLC layer and the MAC layer from top to bottom, and the protocol stack in which IAB-node 2 communicates with IAB-node 1 includes the RLC layer and the adaptation layer (AdaptationLayer, Adpt) and MAC layer. The protocol stack that communicates between IAB-node 1 and IAB-node 2 includes the RLC layer, the Adapt layer and the MAC layer from top to bottom, and the protocol stack that communicates between IAB-node 1 and IAB-donor includes the RLC layer, the Adapt layer and the MAC layer from top to bottom and MAC layer.

Please refer to FIG. 6. FIG. 6 is a schematic structural diagram of another user plane protocol stack disclosed in an embodiment of the present application. The user plane protocol stack has a part of the layer 2 protocol stack. For example, data is between a terminal device, an L2RN, and a base station. The forwarding is based on a PDCP/RLC/MAC packet data unit (Packet Data Unit, PDU), and the base station is, for example, the donor base station (Donorg NodeB, DgNB) in FIG. 5 . Correspondingly, data transmission at the intermediate node can undergo less processing at some protocol layers, resulting in shorter delay and lower signaling overhead. The following figure shows a possible implementation of L2relay: the peer entity of the PDCP of the terminal device is in the base station, and the peer entities of the RLC, MAC and PHY of the terminal device are in the RN. The PDCP PDU is forwarded between nodes, and the PDCP PDU is processed through the Adpt added between the PDCP and the RLC layer. Take the following transmission as an example: the DgNB encapsulates the PDCP PDU into an adaptation layer PDU, and then submits it to the RLC layer, and the adaptation layer adds information such as the identifier of the terminal device and the identifier of the first bearer. The RN selects the corresponding UE DRB to process the data according to the identifier of the terminal device and the identifier of the first bearer, and then sends the data to the terminal device. The Adpt is used to identify the terminal equipment to which the data belongs and the DRB of the terminal equipment when forwarding data between the RN and the DgNB. The Service Data Adaptation Protocol (SDAP) is a protocol layer newly introduced by NR relative to LTE, and is used to process the mapping of Quality of Service flow (Quality of Serviceflow, QoS flow) to DRB. The interface between the RN and the base station may also be an F1AP, a GTP tunnel, or an F1 application protocol (ApplicationProtocol, AP) with extended functions. F1 is a central unit (Central Unit, CU) and a distributed unit (Distributed Unit, DU) interface, GPRS Tunneling Protocol (GPRS Tunnelling Protocol, GTP) tunnel, etc. General Packet Radio Service (GPRS) is a packet transmission.

Based on the user plane protocol stack shown in FIGS. 5 and 6, please refer to FIG. 7. FIG. 7 is another data transmission method provided by an embodiment of the present application, and the method includes but is not limited to the following steps:

Step S701: The second network device sends third configuration information to the terminal device or the fourth network device.

The third configuration information includes retransmission indication information, which is used to instruct the terminal device or the fourth network device to perform data retransmission, and the retransmission indication information includes the serial number (Serial Number, SN) of the PDU of the PDCP layer. The fourth network device includes PDCP and can process PDCP data of its upper-level node or lower-level node.

In a possible implementation manner, the retransmission indication information may include a cause value and/or the number K of retransmission packets.

Taking FIG. 3 as an example, the IAB donor may send the third configuration information to the terminal device.

In a possible implementation manner, the second network device may send third configuration information to the first network device, and the first network device forwards the third configuration information to the terminal device or the fourth network device.

In the above implementation, since the fourth network device includes the PDCP layer, the terminal device can send data to the fourth network device, and the fourth network device processes the PDCP data of the terminal device, and buffers the sent data in the buffer of the PDCP layer. It should be understood that the fourth network device does not necessarily have to be the direct superior node of the terminal device, and the direct superior node means that the terminal device directly sends data to the fourth network device without forwarding by other network devices.

Step S702: The terminal device or the fourth network device retransmits the data of the PDCP PDU according to the retransmission indication information.

In a possible implementation manner, the terminal device or the fourth network device may retransmit all data after the SN according to the SN. Wherein, all the data after the SN includes the packet data of all the PDCP PDUs to which the PDCP packet sequence number is allocated after the SN.

In a possible implementation manner, the terminal device or the fourth network device retransmits K data packets after the PDCP PDU sequence number is SN.

In the embodiment of the present application, the PDCP layer only discards the data packets in the cache in the following two cases: after receiving the PDCP status report fed back by the receiving end, delete the PDCP packets that have been successfully sent back in the report; or the timeout timer ( discardTimer) expires. That is to say, in the scenario of hop-by-hop feedback, if the SDU of PDCP has not been discarded, PDCP can be used for retransmission.

In the method described in FIG. 7 , the second network device sends the third configuration information to the terminal device or the fourth network device, and the terminal device performs data retransmission of the PDCP PDU according to the retransmission indication information, which can effectively realize data retransmission, and Improve the utilization of air interface resources.

Based on the data transmission system shown in FIG. 3, please refer to FIG. 8. FIG. 8 is another data transmission method provided by an embodiment of the present application. The method includes but is not limited to the following steps:

Step S801: The third network device receives fourth configuration information of the second network device.

The third network device may receive fourth configuration information of the second network device. The fourth configuration information includes second indication information, where the second indication information is used to instruct to configure a buffer related to the terminal device or the data of the first bearer.

Taking the data transmission system shown in FIG. 3 as an example, if the terminal device transmits uplink data to the IAB donor via IAB node 3 and IAB node 2, the third network device may be IAB node 3, and the second network device may be IABdonor. The IAB donor may send the fourth configuration information to the IAB node 3 for instructing the IAB node 3 to establish a cache for storing the data about the terminal device or the data of the first bearer.

Taking the data transmission system shown in FIG. 3 as an example, if an IAB donor transmits downlink data to a terminal device via IAB node 2 and IAB node 3, the third network device may be IAB node 2, and the second network device may be IABdonor. The IAB donor may send the fourth configuration information to the IAB node 2 for instructing the IAB node 2 to establish a cache for storing the data about the terminal device or the data of the first bearer.

Step S802: The third network device sends the data to the first network device.

Taking the data transmission system shown in Figure 3 as an example, if the terminal equipment transmits uplink data to the IAB donor via IAB node 3 and IAB node 2, after IAB node 3 receives the uplink data from the terminal equipment, it can send the uplink data to the IAB node. 2.

Taking the data transmission system shown in Figure 3 as an example, if the IAB donor transmits downlink data to the terminal equipment via IAB node 2 and IAB node 3, after the IAB donor sends the downlink data to IAB node 2, IAB node 2 can send the downlink data. to IAB node 3.

Step S803: The first network device sends the data to the receiving end.

Taking the data transmission system shown in FIG. 3 as an example, if the terminal device transmits uplink data to the IAB donor via IAB node 3 and IAB node 2, after IAB node 3 sends the uplink data to IAB node 2, IAB node 2 can send the uplink data to IAB node 2. Data is forwarded to IAB donor.

Taking the data transmission system shown in FIG. 3 as an example, if the IAB donor transmits downlink data to the terminal equipment via IAB node 2 and IAB node 3, after IAB node 2 sends the downlink data to IAB node 3, IAB node 3 can send the downlink data to the terminal equipment. The data is forwarded to the end device.

Step S804: When the receiving end successfully decodes the data, it sends an ACK signal to the first network device.

Taking the data transmission system shown in Fig. 3 as an example, if the terminal equipment transmits uplink data to the IAB donor via IAB node 3 and IAB node 2, after IAB node 2 forwards the uplink data to the IAB donor, if the IAB donor sends the uplink data to the IAB donor Decoding is successful, and the IAB donor sends an ACK signal to IAB node 2.

Taking the data transmission system shown in Figure 3 as an example, if the IAB donor transmits downlink data to the terminal equipment via IAB node 2 and IAB node 3, after the IAB node 3 forwards the downlink data to the terminal equipment, if the terminal equipment transmits the downlink data to the terminal equipment, If decoding is successful, the terminal device sends an ACK signal to IAB node 3.

Step S805: The first network device forwards the ACK signal to the third network device.

In a possible implementation manner, the first network device may also receive fifth configuration information of the second network device, where the fifth configuration information includes third indication information, and the third indication information is used to indicate that when an ACK signal from the receiving end is received , and forward the ACK signal to the third network device.

Taking the data transmission system shown in Figure 3 as an example, if the terminal equipment transmits uplink data to the IAB donor via IAB node 3 and IAB node 2, after the IAB donor sends an ACK signal to IAB node 2, IAB node 2 forwards the ACK signal to the IAB donor. IAB node 3.

Taking the data transmission system shown in Figure 3 as an example, if the IAB donor transmits downlink data to the terminal equipment via IAB node 2 and IAB node 3, after the terminal equipment sends an ACK signal to IAB node 3, IAB node 3 forwards the ACK signal to the terminal equipment. IAB node 2.

Step S806: The third network device deletes the data stored in the cache of the third network device.

After the third network device receives the ACK signal from the receiver, it can determine that the receiver successfully decodes the data, and then deletes the data stored in the cache of the third network device.

Taking the data transmission system shown in FIG. 3 as an example, if the terminal device transmits uplink data to the IAB donor via IAB node 3 and IAB node 2, after IAB node 2 forwards the ACK signal to IAB node 3, IAB node 3 can determine the IAB The donor successfully decodes the uplink data, and then deletes the uplink data stored in the cache of the IAB node 3.

Taking the data transmission system shown in Figure 3 as an example, if the IAB donor transmits downlink data to the terminal equipment via IAB node 2 and IAB node 3, after IAB node 3 forwards the ACK signal to IAB node 2, IAB node 2 can determine the terminal equipment. The device successfully decodes the upstream data, and then deletes the upstream data stored in the cache of the IAB node 2.

In the method described in FIG. 8 , the third network device receives the fourth configuration information of the second network device, and after determining that the receiving end successfully decodes the data, deletes the data stored in the cache of the third network device, which can effectively realize the data Retransmission.

The methods of the embodiments of the present application are described in detail above, and the related devices of the embodiments of the present application are provided below.

Please refer to FIG. 9. FIG. 9 is a schematic structural diagram of a first network device provided by an embodiment of the present application, which is used to implement the functions of the first network device in the embodiment of FIG. 2. The functional blocks of the first network device can be configured by hardware or software. Or a combination of hardware and software to implement the solution of the present application. Those skilled in the art will understand that the functional blocks described in FIG. 9 may be combined or separated into sub-blocks to implement the schemes of the present application. Accordingly, what is described above in this application may support any possible combination or separation or further definition of the functional modules described below.

As shown in FIG. 9, the first network device may include: a receiving module 901 and a processing module 902, wherein the detailed description of each module is as follows.

A receiving module 901, configured to receive first configuration information of a second network device, where the first configuration information includes at least one of the following information: ARQ feedback information of a first bearer, a node identifier of the first network device, The identifier of the first bearer, the identifier of the terminal device, the logical channel identifier, and the ARQ target node identifier;

The processing module 902 is configured to determine whether to perform ARQ feedback according to the first configuration information.

In a possible implementation manner, the ARQ feedback information of the first bearer includes: one of end-to-end feedback, hop-by-hop feedback and feedback indication; the feedback indication is used to indicate that the first network device has a ARQ feedback is performed on the data of the first bearer or no ARQ feedback is performed on the data of the first bearer.

In a possible implementation manner, the ARQ feedback information of the first configuration information corresponds to one or more of the first bearers of the terminal device, or corresponds to all bearers of the terminal device.

In a possible implementation manner, the first configuration information may further include a transmission direction indication, where the transmission direction indication includes uplink transmission or downlink transmission.

In a possible implementation manner, the processing module 902 determines whether to perform ARQ feedback according to the first configuration information, and is specifically used for:

If the ARQ feedback information includes end-to-end feedback, if the identity of the first network device is the same as the identity of the ARQ target node, the first network device sends ARQ feedback, and if the identity of the first network device and the identity of the ARQ target node are the same, the first network device sends ARQ feedback. The ARQ target node identifiers are different, the first network device does not perform ARQ feedback, and forwards the data of the first bearer;

If the ARQ feedback information includes hop-by-hop feedback, the first network device sends ARQ feedback when receiving the data carried by the first bearer;

If the ARQ feedback information includes a feedback indication, the first network device determines whether to perform ARQ feedback on the first bearer data according to the feedback indication.

It should be noted that, the implementation of each module may also correspond to the corresponding description with reference to the embodiment shown in FIG. 2 .

It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation. Each functional module in the embodiments of the present application may be integrated into one processing module, or each module may exist physically alone, or two or more modules may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules.

Another first network device provided by this embodiment of the present application is used to implement the functions of the first network device in the embodiment of FIG. 4 , and the functional blocks of the first network device can be implemented by hardware, software, or a combination of hardware and software. Program. Those skilled in the art should understand that the functional blocks described in the embodiments of the present application may be combined or separated into several sub-blocks to implement the solutions of the present application. Accordingly, what is described above in this application may support any possible combination or separation or further definition of the functional modules described below.

Referring to FIG. 9, the first network device may include: a sending module 903, wherein the detailed description of each module is as follows.

A sending module 903, configured to send return indication information to a third network device, where the return indication information is used to notify the third network device to receive return data, and the return data is sent by the first network device Failed data belonging to a third network device;

The sending module 903 is further configured to send the return data to the third network device;

The first network device is an upper-level node of the third network device.

In a possible implementation manner, the first network device further includes:

The receiving module 901 is configured to receive the feedback information sent by the third network device after the sending module 903 sends the return indication information.

In a possible implementation manner, the first network device further includes:

The processing module 902 is configured to stop receiving the uplink data sent by the third network device after the receiving module 901 receives the feedback information.

It should be noted that, the implementation of each module may also correspond to the corresponding description with reference to the embodiment shown in FIG. 4 .

It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation. Each functional module in the embodiments of the present application may be integrated into one processing module, or each module may exist physically alone, or two or more modules may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules.

Please refer to FIG. 10. FIG. 10 is a schematic structural diagram of a first network device disclosed in an embodiment of the present application. As shown in FIG. 10 , the first network device may include: at least one processor 1001 , a bus 1002 , a receiver 1003 , a transmitter 1004 and a memory 1005 . The receiver 1003, the transmitter 1004, the memory 1005 and the processor 1001 are connected to each other through a bus 1002; the bus 1002 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) ) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used in FIG. 10, but it does not mean that there is only one bus or one type of bus. The processor 1001 may be a central processing unit (Central Processing Unit, CPU), a network processor (network processor, NP), a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application-Specific integrated circuit) Integrated Circuit, ASIC), Field Programmable Gate Array (Field Programmable Gate Array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. In the case where the processor 1001 is a CPU, the CPU may be a single-core CPU or a multi-core CPU. The receiver 1003 and the transmitter 1004 may be integrated into a transceiver. The memory 1005 can store program code, and first configuration information, wherein:

The receiver 1003 receives the first configuration information of the second network device, the first configuration information includes at least one of the following information: the automatic repeat request ARQ feedback information of the first bearer, the node identifier of the first network device , the identifier of the first bearer, the identifier of the terminal device, the logical channel identifier, and the ARQ target node identifier;

The processor 1001 determines whether to perform ARQ feedback according to the first configuration information.

In a possible implementation manner, the ARQ feedback information of the first bearer includes: one of end-to-end feedback, hop-by-hop feedback and feedback indication; the feedback indication is used to indicate that the first network device has a ARQ feedback is performed on the data of the first bearer or no ARQ feedback is performed on the data of the first bearer.

In a possible implementation manner, the ARQ feedback information of the first configuration information corresponds to one or more of the first bearers of the terminal device, or corresponds to all bearers of the terminal device.

In a possible implementation manner, the first configuration information may further include a transmission direction indication, where the transmission direction indication includes uplink transmission or downlink transmission.

In a possible implementation manner, the processor 1001 determines whether to perform ARQ feedback according to the first configuration information, which may specifically be:

If the ARQ feedback information includes end-to-end feedback, if the identity of the first network device and the ARQ target node identity are the same, the transmitter 1004 sends ARQ feedback, if the identity of the first network device and the ARQ If the target node identifiers are different, the transmitter 1004 does not perform ARQ feedback, and the receiver 1003 forwards the data of the first bearer;

If the ARQ feedback information includes hop-by-hop feedback, when the receiver 1003 receives the data carried by the first bearer, the transmitter 1004 sends ARQ feedback;

If the ARQ feedback information includes a feedback indication, the processor 1001 determines whether to perform ARQ feedback on the data of the first bearer according to the feedback indication.

It should be understood that the first network device is only an example provided by the embodiments of the present application, and the first network device may have more or less components than those shown, two or more components may be combined, or Different configurations of components are possible.

Specifically, the first network device introduced in the embodiment of the present application may be used to implement part or all of the processes in the method embodiment introduced in the present application in conjunction with FIG. 2 .

In another embodiment of the present application, as shown in FIG. 10 , the memory 1005 may store program codes, return instruction information, and return data, wherein:

The transmitter 1004 sends the return indication information to the third network device, where the return indication information is used to notify the third network device to receive the return data, and the return data belongs to the one that the first network device fails to send. data of third network devices;

The transmitter 1004 sends the backhaul data to the third network device;

The first network device is an upper-level node of the third network device.

In a possible implementation manner, after the transmitter 1004 sends the return indication information, the receiver 1003 receives the feedback information sent by the third network device.

In a possible implementation manner, after the receiver 1003 receives the feedback information, the processor 1001 stops receiving the uplink data sent by the third network device.

It should be understood that the first network device is only an example provided by the embodiments of the present application, and the first network device may have more or less components than those shown, two or more components may be combined, or Different configurations of components are possible.

Specifically, the first network device introduced in the embodiment of the present application may be used to implement part or all of the processes in the method embodiment introduced in the present application in conjunction with FIG. 4 .

Please refer to FIG. 11. FIG. 11 is a schematic structural diagram of a second network device provided by an embodiment of the present application, which is used to implement the functions of the second network device in the embodiment of FIG. 2. The functional blocks of the second network device can be configured by hardware or software. Or a combination of hardware and software to implement the solution of the present application. Those skilled in the art will understand that the functional blocks described in FIG. 11 may be combined or separated into sub-blocks to implement the schemes of the present application. Accordingly, what is described above in this application may support any possible combination or separation or further definition of the functional modules described below.

As shown in FIG. 11 , the second network device may include: a processing module 1101 and a sending module 1102, wherein the detailed description of each module is as follows.

The processing module 1101 is configured to determine first configuration information, where the first configuration information includes at least one of the following information: the automatic repeat request ARQ feedback mode of the first bearer, the node identifier of the first network device, the The identifier of the first bearer, the identifier of the terminal device, the logical channel identifier, and the ARQ target node identifier;

The sending module 1102 is configured to send the first configuration information to the first network device.

In a possible implementation manner, the ARQ feedback information of the first bearer includes: one of end-to-end feedback, hop-by-hop feedback and feedback indication; the feedback indication is used to indicate that the first network device has a ARQ feedback is performed on the data of the first bearer or no ARQ feedback is performed on the data of the first bearer.

In a possible implementation manner, the first configuration information may further include a transmission direction indication, where the transmission direction indication includes uplink transmission or downlink transmission.

It should be noted that, the implementation of each module may also correspond to the corresponding description with reference to the embodiment shown in FIG. 2 .

It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation. Each functional module in the embodiments of the present application may be integrated into one processing module, or each module may exist physically alone, or two or more modules may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules.

Referring to FIG. 12, FIG. 12 is a schematic structural diagram of a second network device disclosed in an embodiment of the present application. As shown in FIG. 10 , the second network device may include: at least one processor 1201 , a bus 1202 , a receiver 1203 , a transmitter 1204 and a memory 1205 . The receiver 1203, the transmitter 1204, the memory 1205, and the processor 1201 are connected to each other through a bus 1202; the bus 1202 may be a PCI bus or an EISA bus or the like. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used in FIG. 12, but it does not mean that there is only one bus or one type of bus. The processor 1201 may be a CPU, NP, general-purpose processor, DSP, ASIC, FPGA, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. In the case where the processor 1201 is a CPU, the CPU may be a single-core CPU or a multi-core CPU. The receiver 1203 and the transmitter 1204 may be integrated as a transceiver. The memory 1205 can store program code, and first configuration information, wherein:

The processor 1201 is configured to determine first configuration information, where the first configuration information includes at least one of the following information: the automatic repeat request ARQ feedback information of the first bearer, the node identifier of the first network device, the The identifier of the first bearer, the identifier of the terminal device, the logical channel identifier, and the ARQ target node identifier;

The transmitter 1204 is configured to send the first configuration information to the first network device.

In a possible implementation manner, the ARQ feedback information of the first bearer includes: one of end-to-end feedback, hop-by-hop feedback and feedback indication; the feedback indication is used to indicate that the first network device has a ARQ feedback is performed on the data of the first bearer or no ARQ feedback is performed on the data of the first bearer.

In a possible implementation manner, the first configuration information may further include a transmission direction indication, where the transmission direction indication includes uplink transmission or downlink transmission.

It should be understood that the second network device is only an example provided by the embodiments of the present application, and the second network device may have more or less components than those shown, two or more components may be combined, or Different configurations of components are possible.

Specifically, the second network device introduced in the embodiment of the present application may be used to implement part or all of the processes in the method embodiment introduced in the present application in conjunction with FIG. 2 .

Please refer to FIG. 13. FIG. 13 is a schematic structural diagram of a terminal device or a fourth network device provided by an embodiment of the present application, which is used to implement the functions of the terminal device or the fourth network device in the embodiment of FIG. 7. The terminal device or the fourth network device The functional blocks of the network device can be implemented by hardware, software, or a combination of hardware and software to implement the solution of the present application. Those skilled in the art will understand that the functional blocks described in FIG. 13 may be combined or separated into sub-blocks to implement the schemes of the present application. Accordingly, what is described above in this application may support any possible combination or separation or further definition of the functional modules described below.

As shown in FIG. 13, the terminal device or the fourth network device may include: a receiving module 1301 and a processing module 1302, wherein the detailed description of each module is as follows.

The receiving module 1301 is configured to receive third configuration information from the second network device, where the third configuration information includes retransmission indication information, and the retransmission indication information is used to instruct the terminal device or the fourth network device to perform data retransmission, the retransmission indication information includes the SN of the packet data unit PDU of the PDCP layer of the Packet Data Convergence Protocol;

The processing module 1302 is configured to perform data retransmission of the PDCP PDU according to the retransmission indication information.

In a possible implementation manner, the retransmission indication information includes a cause value and/or the number K of retransmission packets.

In a possible implementation manner, the processing module 1302 is specifically configured to:

Retransmit all data after the SN according to the SN;

The data after all the SNs includes the packet data of all PDCP PDUs to which PDCP packet sequence numbers are assigned after the SN.

In a possible implementation manner, the processing module 1302 is specifically configured to:

Retransmit K data packets after the PDCP PDU sequence number is SN.

It should be noted that, the implementation of each module may also correspond to the corresponding description with reference to the embodiment shown in FIG. 7 .

It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation. Each functional module in the embodiments of the present application may be integrated into one processing module, or each module may exist physically alone, or two or more modules may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules.

Please refer to FIG. 14. FIG. 14 is a schematic structural diagram of a terminal device or a fourth network device disclosed in an embodiment of the present application. As shown in FIG. 14 , the terminal device or the fourth network device may include: at least one processor 1401 , a bus 1402 , a receiver 1403 , a transmitter 1404 and a memory 1405 . The receiver 1403, the transmitter 1404, the memory 1405, and the processor 1401 are connected to each other through a bus 1402; the bus 1402 may be a PCI bus or an EISA bus or the like. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is shown in FIG. 14, but it does not mean that there is only one bus or one type of bus. The processor 1401 may be a CPU, NP, general-purpose processor, DSP, ASIC, FPGA or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. In the case where the processor 1401 is a CPU, the CPU may be a single-core CPU or a multi-core CPU. The receiver 1403 and the transmitter 1404 may be integrated into a transceiver. The memory 1405 can store program code, and third configuration information, wherein:

The receiver 1403 receives third configuration information from the second network device, where the third configuration information includes retransmission indication information, where the retransmission indication information is used to instruct the terminal device or the fourth network device to perform data retransmission, The retransmission indication information includes the SN of the packet data unit PDU of the PDCP layer of the Packet Data Convergence Protocol;

The processor 1401 performs data retransmission of the PDCP PDU according to the retransmission indication information.

In a possible implementation manner, the retransmission indication information includes a cause value and/or the number K of retransmission packets.

In a possible implementation manner, the processor 1401 retransmits all data after the SN according to the SN;

The data after all the SNs includes the packet data of all PDCP PDUs to which PDCP packet sequence numbers are assigned after the SN.

In a possible implementation manner, the processor 1401 retransmits K data packets after the PDCP PDU sequence number is SN.

It should be understood that the terminal device or the fourth network device is only an example provided by the embodiments of the present application, and the terminal device or the fourth network device may have more or less components than those shown, and may combine two or More components, or may be implemented with different configurations of components.

Specifically, the second network device introduced in the embodiment of the present application may be used to implement part or all of the processes in the method embodiment introduced in the present application in conjunction with FIG. 7 .

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server, or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes an integration of one or more available media. The usable media may be magnetic media (eg, floppy disks, storage disks, magnetic tapes), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk (SSD)), among others.

Claims (27)

1. A method of data transmission, the method comprising:

the method comprises the steps that a first network device receives first configuration information of a second network device, wherein the first configuration information comprises at least one of the following information: automatic repeat request ARQ feedback information of a first bearer, a node identifier of the first network equipment, an identifier of the first bearer, an identifier of terminal equipment, a logical channel identifier and an ARQ target node identifier;

the first network equipment determines whether to perform ARQ feedback according to the first configuration information;

the ARQ feedback information of the first bearer includes: one of end-to-end feedback, hop-by-hop feedback, and a feedback indication, where the feedback indication is used to indicate that the first network device performs ARQ feedback on the data of the first bearer or does not perform ARQ feedback on the data of the first bearer;

the determining, by the first network device according to the first configuration information, whether to perform ARQ feedback includes:

if the ARQ feedback information comprises end-to-end feedback, if the identifier of the first network equipment is the same as the identifier of the ARQ target node, the first network equipment sends ARQ feedback, and if the identifier of the first network equipment is different from the identifier of the ARQ target node, the first network equipment does not carry out ARQ feedback and forwards the data of the first bearer;

if the ARQ feedback information comprises hop-by-hop feedback, the first network equipment sends ARQ feedback when receiving the data of the first bearer;

and if the ARQ feedback information comprises a feedback indication, the first network equipment determines whether to perform ARQ feedback on the data of the first bearer according to the feedback indication.

2. The method of claim 1, wherein the ARQ feedback information for the first configuration information corresponds to one or more of the first bearers for the terminal device or to all bearers for the terminal device.

3. The method of any of claims 1-2, wherein the first configuration information further comprises a transmission direction indication, the transmission direction indication comprising an uplink transmission or a downlink transmission.

4. A method of data transmission, the method comprising:

the second network equipment determines first configuration information, wherein the first configuration information comprises at least one of the following information: the method comprises the steps that automatic repeat request ARQ feedback information of a first bearer, a node identifier of first network equipment, an identifier of the first bearer, an identifier of terminal equipment, a logical channel identifier and an ARQ target node identifier are obtained;

the second network device sends the first configuration information to the first network device;

the ARQ feedback information of the first bearer includes: one of end-to-end feedback, hop-by-hop feedback, and a feedback indication; the feedback indication is used for indicating the first network device to perform ARQ feedback on the data of the first bearer or not to perform ARQ feedback on the data of the first bearer.

5. The method of claim 4, wherein the first configuration information further comprises a transmission direction indication, and the transmission direction indication comprises an uplink transmission or a downlink transmission.

6. A method of data transmission, the method comprising:

the method comprises the steps that a first network device sends back transmission indicating information to a third network device, wherein the back transmission indicating information is used for informing the third network device to receive back transmission data, and the back transmission data is data which is failed to be sent to a superior node by the first network device and belongs to the third network device;

the first network device sends the backhaul data to the third network device;

the first network device is a superior node of the third network device.

7. The method of claim 6, further comprising: and after the first network equipment sends the return indication information, receiving feedback information sent by the third network equipment.

8. The method of claim 7, further comprising: and after receiving the feedback information, the first network equipment stops receiving the uplink data sent by the third network equipment.

9. A method of data transmission, the method comprising:

the terminal equipment receives third configuration information from second network equipment, wherein the third configuration information comprises retransmission indication information, the retransmission indication information is used for indicating the terminal equipment to carry out data retransmission, and the retransmission indication information comprises a serial number SN of a packet data unit PDU of a packet data convergence protocol PDCP layer;

the terminal equipment retransmits the data of the PDCP PDU according to the retransmission indication information;

the terminal equipment performs data retransmission of the PDCP PDU according to the retransmission indication information, and comprises the following steps:

the terminal equipment retransmits data after all SNs according to the SNs;

the data after all SNs includes a data packet to which packet data of all PDCP PDUs is assigned a PDCP packet sequence number after the SNs.

10. The method of claim 9, wherein the retransmission indication information comprises a cause value, and/or a number of retransmitted packets, K.

11. The method of claim 10, wherein the terminal device performing data retransmission of PDCP PDUs according to the retransmission indication information comprises:

the terminal equipment retransmits data after all SNs according to the SNs;

the data after all SNs includes a data packet to which packet data of all PDCP PDUs is assigned a PDCP packet sequence number after the SNs.

12. The method of claim 10, wherein the terminal device performing data retransmission of PDCP PDUs according to the retransmission indication information comprises:

and the terminal equipment retransmits the K data packets with the sequence number of the PDCP PDU being after the SN.

13. A first network device, the device comprising:

a receiving module, configured to receive first configuration information of a second network device, where the first configuration information includes at least one of the following information: automatic repeat request ARQ feedback information of a first bearer, a node identifier of the first network equipment, an identifier of the first bearer, an identifier of terminal equipment, a logical channel identifier and an ARQ target node identifier;

a processing module, configured to determine whether to perform ARQ feedback according to the first configuration information;

the ARQ feedback information of the first bearer includes: one of end-to-end feedback, hop-by-hop feedback, and a feedback indication; the feedback indication is used for indicating the first network device to perform ARQ feedback on the data of the first bearer or not to perform ARQ feedback on the data of the first bearer;

the processing module determining whether to perform ARQ feedback according to the first configuration information includes:

if the ARQ feedback information comprises end-to-end feedback, if the identifier of the first network equipment is the same as the identifier of the ARQ target node, sending ARQ feedback, if the identifier of the first network equipment is different from the identifier of the ARQ target node, not carrying out ARQ feedback, and forwarding the data of the first bearer;

if the ARQ feedback information comprises hop-by-hop feedback, transmitting ARQ feedback when receiving the data of the first bearer;

and if the ARQ feedback information comprises a feedback indication, determining whether to perform ARQ feedback on the data of the first bearer according to the feedback indication.

14. The apparatus of claim 13, wherein the ARQ feedback information for the first configuration information corresponds to one or more of the first bearers for the terminal device or to all bearers for the terminal device.

15. The apparatus of any one of claims 13-14, wherein the first configuration information further comprises a transmission direction indication, the transmission direction indication comprising an uplink transmission or a downlink transmission.

16. A second network device, the device comprising:

a processing module, configured to determine first configuration information, where the first configuration information includes at least one of: the method comprises the steps that automatic repeat request ARQ feedback information of a first bearer, a node identifier of first network equipment, an identifier of the first bearer, an identifier of terminal equipment, a logical channel identifier and an ARQ target node identifier are obtained;

a sending module, configured to send the first configuration information to the first network device;

the ARQ feedback information of the first bearer includes: one of end-to-end feedback, hop-by-hop feedback, and a feedback indication; the feedback indication is used for indicating the first network device to perform ARQ feedback on the data of the first bearer or not to perform ARQ feedback on the data of the first bearer.

17. The apparatus of claim 16, wherein the first configuration information further comprises a transmission direction indication, the transmission direction indication comprising an uplink transmission or a downlink transmission.

18. A first network device, the device comprising:

a sending module, configured to send backhaul indication information to a third network device, where the backhaul indication information is used to notify the third network device to receive backhaul data, and the backhaul data is data that the first network device fails to send to a superior node and belongs to the third network device;

the sending module is further configured to send the backhaul data to the third network device;

the first network device is a superior node of the third network device.

19. The apparatus of claim 18, wherein the apparatus further comprises:

and the receiving module is used for receiving the feedback information sent by the third network equipment after the sending module sends the return indication information.

20. The apparatus of claim 19, wherein the apparatus further comprises:

and the processing module is used for stopping receiving the uplink data sent by the third network equipment after the receiving module receives the feedback information.

21. A terminal device, characterized in that the device comprises:

a receiving module, configured to receive third configuration information from a second network device, where the third configuration information includes retransmission indication information, the retransmission indication information is used to indicate the terminal device to perform data retransmission, and the retransmission indication information includes a SN of a packet data unit PDU of a packet data convergence protocol PDCP layer;

a processing module, configured to perform data retransmission of the PDCP PDU according to the retransmission indication information;

the processing module is specifically configured to:

retransmitting data after all SNs according to the SNs;

the data after all SNs includes a data packet to which packet data of all PDCP PDUs is assigned a PDCP packet sequence number after the SNs.

22. The apparatus of claim 21, wherein the retransmission indication information comprises a cause value, and/or a number of retransmission packets, K.

23. The device according to claim 22, wherein the processing module is specifically configured to:

and retransmitting K data packets with the sequence number of the PDCP PDU being after the SN.

24. A first network device, comprising a receiver, a processor, and a memory, the processor establishing communication with the receiver and the memory, respectively;

the receiver for performing the method of any one of claims 1-3;

the processor configured to perform the method of any one of claims 1-3.

25. A second network device, wherein the first network device comprises a transmitter and a memory, wherein the transmitter and the memory establish communication;

the transmitter for performing the method of any one of claims 4-5.

26. A first network device, wherein the first network device comprises a transmitter and a memory, wherein the transmitter and the memory establish communication;

the transmitter for performing the method of any one of claims 6-8.

27. A terminal device, characterized in that the terminal device comprises a receiver, a processor and a memory, the processor establishing communication with the receiver and the memory, respectively;

the receiver for performing the method of any one of claims 9-12;

the processor configured to perform the method of any one of claims 9-12.

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