WO2022178778A1

WO2022178778A1 - Data transmission method and communication apparatus

Info

Publication number: WO2022178778A1
Application number: PCT/CN2021/077960
Authority: WO
Inventors: 许斌; 陈磊; 李秉肇
Original assignee: 华为技术有限公司
Priority date: 2021-02-25
Filing date: 2021-02-25
Publication date: 2022-09-01

Abstract

The present application provides a data transmission method and a communications apparatus. Said method comprises: an access network device receiving first indication information, the first indication information being used to indicate a transmission sequence of at least two data packets; the access network device setting an access network sequence number for the at least two data packets according to the transmission sequence; and the access network device sending the at least two data packets to a terminal device according to the transmission sequence. In this way, the access network device can send data to the terminal device according to the transmission sequence of the received data packets, so that data packets associated with each other in a data stream may be synchronously transmitted, thereby improving the reliability of the data received by the terminal device, and further improving the success rate in decoding video data.

Description

A data transmission method and communication device

technical field

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

Background technique

Due to the huge amount of raw data included in the video service, it is very difficult to directly transmit and store it, so it is necessary to perform video coding on the video to be transmitted. Common video coding techniques include: frame coding and layered coding. Among them, frame coding refers to dividing the video picture to be transmitted into I frame (also known as intra-coded frame, which is an independent frame with all its own information and can be decoded independently), P frame (also known as inter-frame predictive coding frame, recording The difference between the current frame and the previous frame needs to be decoded by referring to the previous frame of the current frame) and B frame (also known as bidirectional predictive coding frame, which records the difference between the current frame and the previous frame and the current frame and the next frame. Refer to the previous frame and the next frame of the current frame to decode). Layered coding refers to dividing the video picture to be transmitted in time, space and quality, and outputting basic layer data (the decoder can obtain basic video with a lower frame rate or lower resolution after decoding it) and enhancement. Layer data (which is decoded by the decoder to improve the picture quality of the lower resolution base video).

In the process of transmitting video data through wireless communication technology, the video data will pass through a variety of devices (core network devices, access network devices, and terminal devices). For example, as far as the downlink video data of the terminal equipment is concerned, the core network equipment will divide it into multiple data streams according to the transmission requirements of different video data, and send these data streams through the transmission channel between the core network and the access network equipment. to the access network device; each protocol layer of the access network device sequentially processes the data packets in the video data stream and sends them to the terminal device through the air interface; the terminal device receives the data packets in each data stream sent by the access network device Afterwards, each peer-to-peer protocol layer performs corresponding processing on each data packet in the reverse order, and finally reads the video content at the application layer. Currently, in the transmission process, the transmission and processing of different data streams by the access network device and the terminal device are independent of each other, which will cause the transmission of different streams to be asynchronous, thereby affecting the decoding success rate of the final video data.

SUMMARY OF THE INVENTION

The present application provides a data transmission method and a communication device, so that in the process of media data transmission between core network equipment, access network equipment and terminal equipment, the association relationship between each data packet is referred to, and the data flow is correlated with each other The data packets of each QoS flow can be transmitted synchronously, so as to improve the reliability of the data received by the terminal device, so that the terminal device can correctly decode the data packets of each QoS flow corresponding to the target service according to the relationship between the data packets of each QoS flow , to improve the decoding success rate of video data.

In a first aspect, the present application provides a data transmission method. The method includes: an access network device receives first indication information, where the first indication information is used to indicate a transmission sequence of at least two data packets; The transmission sequence sets the access network sequence number for the at least two data packets; the access network device sends the at least two data packets to the terminal device according to the transmission sequence.

Based on the method described in the first aspect, when the data to be transmitted is downlink data, after receiving multiple data packets, the access network device may also receive a transmission sequence indicating each data packet (it can be understood that the transmission sequence reflects each data packet) The synchronous decoding relationship between packets, that is, the indication information of the association relationship), and then send data to the terminal device according to the transmission sequence between each data packet, thereby improving the reliability of the data received by the terminal device, so that the terminal device can The association relationship between the data packets of each QoS flow, the data packets of each QoS flow corresponding to the target service are correctly decoded, and the decoding success rate of the video data is improved.

In a possible implementation, the access network device receives the first indication information from the core network device. Based on this possible implementation, the core network device can determine the transmission sequence between each data packet, and then the core network device notifies the access network device of the transmission sequence between each data packet, so that the access network device can This transmission sequence transmits the individual data packets to the end device.

In a possible implementation, the first indication information is core network sequence numbers of the at least two data packets. Based on this possible implementation, the access network device can determine the transmission sequence between each data packet according to the core network serial number in the data packet, without requiring additional reception indication information, thus saving transmission resources.

In a possible implementation, the at least two data packets belong to at least two quality of service flows, QoS flows, and the first indication information is further used to indicate that the data packets of the two QoS flows are related to each other. Based on this possible implementation, when the data packets of different QoS flows have an association relationship and need to be transmitted cooperatively, the access network device can obtain the transmission relationship between the data packets of the QoS flow from the first indication information As well as the association relationship, there is no need for additional receiving indication information, which saves transmission resources.

In a possible implementation, the access network device receives second indication information, where the second indication information is used to indicate the allowable difference between the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence The maximum deviation value, where the first data packet is any one of the at least two data packets. Based on the implementation of this possible implementation manner, when the access network device transmits the at least two data packets according to the transmission sequence, it is allowed to deviate from the transmission sequence, which can improve the robustness and flexibility of data transmission.

In a possible implementation, the access network device generates third indication information based on the first indication information, where the third indication information is used to indicate a delivery order of the at least two data packets; the access network device sends the terminal device the third indication information. Based on the implementation of this possible implementation, the access network device indicates the delivery sequence of the at least two data packets to the terminal device based on the transmission sequence between the data packets, thereby ensuring that the data packets are in the transmission process and the reading process. timing synchronization.

In a possible implementation, the delivery order is the reading order of the at least two data packets by the terminal device. Based on this possible implementation, the terminal device can deliver each data packet in sequence according to the delivery order generated by the transmission sequence between the data packets, that is, it can be understood that the terminal device synchronously reads data from the interrelated data packets .

In a possible implementation, the third indication information is access network sequence numbers of at least two data packets. Based on this possible implementation, the access network device can indicate the delivery sequence of each data packet to the terminal device through the access network serial number in the data packet, without requiring additional transmission indication information, saving communication transmission resources.

In a possible implementation, the access network serial number is a packet data convergence protocol PDCP serial number SN or a first protocol serial number, and the first protocol serial number is different from the PDCP SN. Based on this possible implementation, the access network device can use the PDCP SN or other protocol sequence numbers to indicate the delivery order of each data packet, which ensures the timing synchronization of the data packets during the transmission process and the reading process.

In a second aspect, the present application provides another data transmission method, the method includes: the access network device receives first indication information, where the first indication information is used to indicate the transmission sequence of at least two data packets; the access network device Receive at least two data packets sent by the terminal device; the access network device sets the core network sequence number for the at least two data packets according to the transmission sequence; the access network device sends the at least two data packets to the core network device according to the transmission sequence.

Based on the method described in the second aspect, when the data to be transmitted is uplink data, after receiving the multiple data packets sent by the terminal device, the access network device can follow the transmission sequence indicated by the indication information (it can be understood that the transmission sequence reflects the The synchronous decoding relationship between each data packet in the uplink data packet, that is, the association relationship) sets the core network serial number for each data packet, and sends the data packet to the core network device according to the transmission sequence, so as to improve the reliability of the data received by the core network. sex.

In a possible implementation, the access network device receives the first indication information from the core network device. Based on the implementation of this possible implementation manner, the core network device may determine the transmission sequence of each data packet, and the access network device transmits each data packet to the core network device according to the transmission sequence determined by the core network.

In a possible implementation, the access network device receives second indication information, where the second indication information is used to indicate the allowable difference between the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence The maximum deviation value, where the first data packet is any one of the at least two data packets. Based on the implementation of this possible implementation manner, when the access network device transmits the at least two data packets according to the transmission sequence, it is allowed to deviate from the transmission sequence, which can improve the robustness and flexibility of the transmission process.

In one possible implementation, the access network device sends fourth indication information to the terminal device, where the fourth indication information is used to adjust a parameter value of at least one logical channel, where the at least one logical channel is used to transmit at least two data packets. Based on this possible implementation, the access network device can adjust the transmission progress between the data packets of each data stream by configuring the parameter values of the logical channel, so that the transmission progress of each data packet fits the transmission of each data packet order.

In a possible implementation, the fourth indication information is a medium access control layer control unit MAC CE or downlink control information DCI. Based on this possible implementation, in the process of data packet transmission, the access network device can dynamically configure the logical channel through MAC CE or DCI, so as to avoid the situation that data transmission is interrupted due to the reconfiguration of logical channel parameters.

In a possible implementation, the access network device generates fifth indication information based on the first indication information, where the fifth indication information is used to indicate the transmission sequence of the at least two data packets; the access network device sends the terminal device the Fifth indication information. Based on this possible implementation, the access network device sends the transmission sequence to the terminal device, so that the terminal device can send each data packet to the access network device according to the transmission data, and then the terminal device transmits the transmission sequence and connection of each data packet. The transmission sequence of each data packet transmitted by the network access device is consistent.

In a possible implementation, the fifth indication information is further used to indicate the maximum allowable deviation value between the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence, wherein the first data packet Any of at least two packets. Based on the implementation of this possible implementation manner, when the access network device receives the at least two data packets according to the transmission order, it is allowed to deviate from the transmission order, and in this way, the robustness and flexibility of the transmission process can be improved.

In a third aspect, the terminal device receives fifth indication information sent by the access network device, where the fifth indication information is used to indicate the transmission sequence of the at least two data packets; the terminal device sends the at least two data packets to the access network device according to the transmission sequence two packets.

Based on the method described in the third aspect, when the data to be transmitted is uplink data, the terminal device according to the transmission sequence indicated by the access network device (it can be understood that the transmission sequence reflects the synchronous decoding relationship between each data packet, that is, the association relationship ), send the at least two data packets to the access network equipment, and then the transmission order of the terminal equipment to transmit each data packet is consistent with the transmission order of the access network equipment to transmit each data packet, thereby improving the data received by the access network equipment. reliability.

In a possible implementation, the terminal device sets an access network sequence number for the at least two data packets based on the transmission sequence. Based on this possible implementation, when the terminal device and the access network device have a common protocol layer entity, the terminal device can set the access network serial number based on the transmission sequence, and then transmit each data packet to the access network device.

In a possible implementation, the fifth indication information is further used to indicate the maximum allowable deviation value between the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence, wherein the first data packet Any of at least two packets. Based on the implementation of this possible implementation manner, when the terminal device transmits the at least two data packets according to the transmission sequence, it is allowed to deviate from the transmission sequence, and in this way, the robustness and flexibility in the transmission process can be improved.

In a possible implementation, the terminal device adjusts the parameter value of at least one logical channel based on the maximum allowable deviation value between the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence, The at least one logical channel is used to transmit the at least two data packets. Based on this possible implementation, the terminal device can adjust the transmission progress between data packets transmitted by each logical channel by configuring the parameter values of the logical channels, so that the transmission progress of each data packet fits the transmission data of each data packet .

In a fourth aspect, the present application provides a communication device, which may be an access network device, a device in an access network device, or a device that can be matched with the access network device. Wherein, the communication device may also be a chip system, and the communication device may execute the method described in the first aspect. The functions of the communication device may be implemented by hardware, or by executing corresponding software by hardware. The hardware or software includes one or more units corresponding to the above-mentioned functions. The unit may be software and/or hardware. For operations and beneficial effects performed by the communication device, reference may be made to the methods and beneficial effects described in the first aspect or the second aspect, and repeated descriptions will not be repeated.

In a fifth aspect, the present application provides a communication apparatus, and the apparatus may be a terminal device, a device in a terminal device, or a device that can be matched and used with the terminal device. Wherein, the communication device may also be a chip system, and the communication device may execute the method described in the third aspect. The functions of the communication device may be implemented by hardware, or by executing corresponding software by hardware. The hardware or software includes one or more units corresponding to the above-mentioned functions. The unit may be software and/or hardware. For operations and beneficial effects performed by the communication device, reference may be made to the method and beneficial effects described in the third aspect above, and repeated details will not be repeated.

In a sixth aspect, the present application provides a communication device, the communication device includes a processor, when the processor invokes a computer program in a memory, the method according to the first aspect or the second aspect accesses a network The method performed by the device is executed.

In a seventh aspect, the present application provides a communication apparatus, the communication apparatus includes a processor, and when the processor calls a computer program in a memory, the method performed by the terminal device in the method described in the third aspect is executed .

In an eighth aspect, the present application provides a communication device, the communication device includes a processor and a memory, the memory is used for storing computer-executed instructions; the processor is used for executing the computer-executed instructions stored in the memory, so that the The communication apparatus performs the method performed by the access network device in the method described in the first aspect or the second aspect.

In a ninth aspect, the present application provides a communication device, the communication device includes a processor and a memory, the memory is used for storing computer-executable instructions; the processor is used for executing the computer-executable instructions stored in the memory, so that the The communication apparatus performs the method performed by the terminal device in the method described in the third aspect.

In a tenth aspect, the present application provides a communication device, the communication device includes a processor, a memory and a transceiver, the transceiver is used for receiving a signal or sending a signal; the memory is used for storing a computer program; the The processor is configured to call the computer program from the memory to execute the method performed by the access network device in the method according to the first aspect or the second aspect.

In an eleventh aspect, the present application provides a communication device, the communication device includes a processor, a memory, and a transceiver, the transceiver is used for receiving a signal or sending a signal; the memory is used for storing a computer program; the The processor is configured to call the computer program from the memory to execute the method performed by the terminal device in the method described in the third aspect.

In a twelfth aspect, the present application provides a communication device, the communication device includes a processor and an interface circuit, the interface circuit is configured to receive computer-executed instructions and transmit them to the processor; the processor runs the The computer executes the instructions to execute the method performed by the access network device in the method described in the first aspect or the second aspect.

In a thirteenth aspect, the present application provides a communication device, the communication device includes a processor and an interface circuit, the interface circuit is configured to receive computer-executed instructions and transmit them to the processor; the processor runs the The computer executes the instructions to execute the method performed by the terminal device in the method described in the third aspect.

In a fourteenth aspect, the present application provides a computer-readable storage medium for storing computer-executable instructions, and when the computer-executable instructions are executed, the first aspect or the second aspect is described as follows: The method performed by the access network device in the method described in the third aspect, or the method performed by the terminal device in the method described in the third aspect.

In a fifteenth aspect, the present application provides a computer program product comprising a computer program, when the computer program is executed, the method performed by the access network device in the method described in the first aspect or the second aspect is realized, Or the method performed by the terminal device in the method described in the third aspect is implemented.

In a sixteenth aspect, the present application provides a communication system, the communication system comprising the communication device of the fourth aspect or the sixth aspect or the eighth aspect or the tenth aspect or the twelfth aspect, and the fifth aspect or The communication device of the seventh aspect or the ninth aspect or the eleventh aspect or the thirteenth aspect.

Description of drawings

1 is a schematic diagram of a QoS model provided by an embodiment of the present application;

FIG. 2a is a schematic diagram of a 5G network architecture provided by an embodiment of the present application;

FIG. 2b is a schematic diagram of downlink data transmission between layers according to an embodiment of the present application;

FIG. 2c is a schematic diagram of a CU-DU separation architecture provided by an embodiment of the present application;

FIG. 2d is a schematic diagram of another CU-DU separation architecture provided by an embodiment of the present application;

FIG. 2e is a schematic diagram of the distribution of an air interface protocol stack provided by an embodiment of the application;

FIG. 3 is a schematic structural diagram of a system architecture provided by an embodiment of the present application;

4 is a schematic flowchart of a data transmission method provided by an embodiment of the present application;

5 is a schematic diagram of a data transmission process between a core network device and an access network device according to an embodiment of the present application;

6 is a schematic diagram of another data transmission process between a core network device and an access network device according to an embodiment of the present application;

7a is a schematic diagram of a data transmission process between an access network device and a terminal device according to an embodiment of the application;

7b is a schematic diagram of another data transmission process between an access network device and a terminal device according to an embodiment of the application;

7c is a schematic diagram of a data packet transmission sequence provided by an embodiment of the present application;

FIG. 8 is a schematic flowchart of another data transmission method provided by an embodiment of the present application;

9 is a schematic diagram of a data transmission process provided by an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a communication device according to an embodiment of the present application;

FIG. 11 is a schematic structural diagram of another communication apparatus according to an embodiment of the present application.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings.

The terms "first" and "second" in the description, claims and drawings of the present application are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of operations or units is not limited to the listed operations or units, but optionally also includes unlisted operations or units, or optionally also includes For other operations or units inherent to these processes, methods, products or devices.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor a separate or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

In this application, "at least one (item)" means one or more, "plurality" means two or more, "at least two (item)" means two or three and three In the above, "and/or" is used to describe the corresponding relationship between corresponding objects, indicating that there can be three kinds of relationships, for example, "A and/or B" can mean: only A exists, only B exists, and both A and B exist three A case where A and B can be singular or plural. The character "/" generally indicates that the corresponding object before and after is an "or" relationship. "At least one item(s) below" or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (a) of a, b or c, can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c" ", where a, b, c can be single or multiple.

In order to better understand the solutions provided by this application, the relevant terms involved in the embodiments of this application are introduced below:

Video coding: including frame coding and layered coding, as follows:

As far as frame coding is concerned, in the H.264 compression standard, the transmitted video pictures can be divided into: intra-frame coded frame (intra picture frame, I frame), forward predictive coding frame (predictive-frame, P frame) and bidirectional Predictive interpolation coding frame (bi-directional interpolated prediction frame, B frame). Among them, an I frame is an independent frame with all its own information, which can be decoded without referring to other images, and can be understood as a static picture. Because I-frames are keyframes, the first frame in a video sequence is always an I-frame. The P frame, also known as the need to refer to the previous frame for encoding, represents the difference between the current frame and the previous frame (the previous frame may be an I frame or a P frame). When the P frame is decoded, the difference defined in this frame needs to be superimposed on the previously buffered picture to generate the final picture. Compared with I-frames, P-frames generally occupy fewer data bits, but are very sensitive to transmission errors due to their complex dependencies on their preceding frames (P-frames or I-frames). The B frame records the difference between the current frame and the previous frame, that is, to decode the B frame, not only the previous cached image, but also the decoded image must be obtained, and the final image is obtained by superimposing the previous image and the current frame data. The B frame has a high compression rate, but requires high decoding performance.

In terms of layered coding, the transmitted video pictures can be encoded hierarchically in time, space and quality, and output multi-layer data (including base layer data and enhancement layer data). The decoder decodes the data of the base layer data, and can decode the basic video content, but the obtained video image may have a lower frame rate, lower resolution or lower quality. The enhancement layer data refers to the base layer data, and the encoded data can improve the frame rate, resolution or picture quality. For example, a scaled video coding (SVC) technology encodes a video signal in a layered form to obtain data layers corresponding to multiple resolutions, qualities or frame rates. When the bandwidth is insufficient, in order to ensure that the decoding end can receive smooth video images that can be viewed, only the data of the base layer is transmitted and decoded. When the bandwidth gradually becomes larger, the data of the enhancement layer can be transmitted and decoded to improve the decoding quality of the video. When the video data has multiple layers of enhancement layer data, within the range of the total bit rate of the video data, the higher the bit rate of the received enhancement layer data, the better the video quality.

General Packet Radio Service (GPRS): It is a wireless packet switching technology based on the Global System for Mobile Communications (GSM), which provides end-to-end, wide-area wireless IP connections.

GPRS Tunneling Protocol (GTP): It is a set of communication protocols based on the Internet Protocol (IP), which is used to carry GPRS in the GSM network. Contains the control plane part of the protocol (also known as GTP-C) and the user plane part of the protocol (GTP-U).

Quality of service flow (QoS flow): Data transmission can be performed between terminal equipment and user plane functional network elements through a protocol data unit (PDU) session, and each PDU session can transmit multiple different The data flow required by QoS, that is, the QoS flow.

FIG. 1 is a schematic diagram of a QoS model in a 5G communication system. As shown in Figure 1, in the downstream direction, after the data packets arrive at the UPF network element, the UPF network element distinguishes the downstream data packets according to the packet filter sets (packet filter sets) in the packet detection rule (PDR) configured by the SMF network element. To different QoS flows, the data packets in the QoS flow are marked with the QoS flow indicator (QoS flow indicator, QFI). Then, the UPF network element transmits the data packet to the access network device through the N3 interface (that is, the interface between the access network and the UPF network element). After receiving the data packet, the access network device determines the corresponding QFI of the data packet. The QoS flow to which the data packet belongs, and then the downlink data packet is transmitted on the air interface according to the QoS parameters of the QoS flow. In the upstream direction, after the application layer of the terminal device obtains the data packets, it can distinguish the upstream data packets into different QoS flows according to the packet filtering set in the QoS rules configured by the SMF network element, and then transmit the upstream data packets on the air interface. . Each QoS flow is associated with a QoS profile (QoS profile), at least one QoS rule, and optional QoS parameters.

The system architecture of the embodiment of the present application will be introduced below:

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (general packet radio service, GPRS), long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE Time division duplex (TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, 5th generation (5G) system or new radio (NR) and future communication systems, etc.

Taking the application of the embodiments of the present application to the 5G system as an example, the following describes the relevant network elements in the 5G system in detail:

Referring to FIG. 2a, the network architecture shown in FIG. 2a is taken as an example of a 5G network architecture based on a service-oriented architecture defined in the standardization process of 3GPP. As shown in Figure 2a, the network architecture may include terminal equipment parts, a (radio) access network ((R)AN), a core network (CN) and a data network (DN) ). Among them, the (R)AN (hereinafter described as RAN) is used to access the terminal equipment to the wireless network, and the CN is used to manage the terminal equipment and provide a gateway for communicating with the DN.

The terminal equipment, RAN, CN and DN involved in FIG. 2a will be described in detail below.

1. Terminal equipment

The terminal equipment part in Fig. 2a includes a terminal equipment 210, which may also be referred to as user equipment (UE). The terminal device 210 in the embodiment of the present application is a device with a wireless transceiver function, and can communicate with one or more core networks (core network, CN) via the access network device in the access network (AN) 240 network elements to communicate with. Terminal equipment 210 may also be referred to as an access terminal, terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless network device, user agent, or user equipment, or the like. The terminal device 210 can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; can also be deployed on water (such as ships, etc.); and can also be deployed in the air (such as planes, balloons, satellites, etc.). The terminal device 210 may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a smart phone, a cell phone, a wireless local loop (WLL) station, a personal digital assistant (PDA) , which can be handheld devices with wireless communication capabilities, computing devices or other devices connected to wireless modems, in-vehicle devices, wearable devices, drone devices, or terminals in the Internet of Things, Internet of Vehicles, fifth-generation mobile communications (fifth generation mobile communications) Generation, 5G) network and any form of terminal in the future network, relay user equipment or terminal in the future evolved public land mobile network (public land mobile network, PLMN), etc., wherein, the relay user equipment, for example, can be 5G home gateway (residential gateway, RG). For example, the terminal device 210 may be a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in telemedicine, and a smart grid. Wireless terminals in (smart grid), wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, etc. This embodiment of the present application does not limit this.

2. RAN

As shown in Figure 2a, the RAN includes access network equipment 240. It should be known that the RAN may include one or more RAN devices (or access network devices), and the interface between the access network device and the terminal device may be a Uu interface (or called an air interface). Of course, in future communications, the names of these interfaces may remain unchanged, or may be replaced with other names, which are not limited in this application.

An access network device is a node or device that accesses a terminal device to a wireless network. An access network device includes, but is not limited to, a new generation base station (gNB), an evolved node B ( evolved node B (eNB), next generation eNB (ng-eNB), wireless backhaul equipment, radio network controller (RNC), node B (node B, NB), base station Controller (base station controller, BSC), base transceiver station (base transceiver station, BTS), home base station ((home evolved nodeB, HeNB) or (home node B, HNB)), baseband unit (baseBand unit, BBU), Transmission and receiving point (transmitting and receiving point, TRP), transmitting point (transmitting point, TP), mobile switching center, etc.

(1) Protocol layer structure

The communication between the access network device and the terminal device follows a certain protocol layer structure. For example, the control plane protocol layer structure may include a radio resource control (radio resource control, RRC) layer, a packet data convergence layer protocol (packet data convergence protocol, PDCP) ) layer, radio link control (radio link control, RLC) layer, media access control (media access control, MAC) layer and physical layer (Physical Layer, PHY layer); the user plane protocol layer structure may include PDCP layer, RLC layer, MAC layer, and physical layer. In a possible implementation, the PDCP layer may further include a service data adaptation protocol (SDAP) layer.

Taking the data transmission between the access network device and the terminal device as an example, the data transmission needs to go through the user plane protocol layer, such as the SDAP layer, PDCP layer, RLC layer, MAC layer, and physical layer, among which SDAP layer, PDCP layer, The RLC layer, the MAC layer, and the physical layer may also be collectively referred to as the access layer. Exemplarily, data is transmitted between the access network device and the terminal device by establishing at least one data radio bearer (DRB), and each DRB may correspond to a set of functional entities, such as including a PDCP layer entity, the At least one RLC layer entity corresponding to the PDCP layer entity, at least one MAC layer entity corresponding to the at least one RLC layer entity, and at least one physical layer entity corresponding to the at least one MAC layer entity. It should be noted that at least one signaling radio bearer (SRB) can also be established between the access network device and the terminal device to transmit signaling. DRB and SRB can be collectively referred to as radio bearer (RB) .

Take downlink data transmission as an example, Figure 2b is a schematic diagram of downlink data transmission between layers, the downward arrow in Figure 2b represents data transmission, and the upward arrow represents data reception. After the SDAP layer entity obtains the data from the upper layer, it can map the data to the PDCP layer entity of the corresponding DRB according to the QoS flow indicator (QFI) of the data, and the PDCP layer entity can transmit the data to at least one corresponding to the PDCP layer entity. One RLC layer entity is further transmitted by at least one RLC layer entity to the corresponding MAC layer entity, and then the MAC layer entity generates a transport block, and then performs wireless transmission through the corresponding physical layer entity. The data is encapsulated correspondingly in each layer. The data received by a certain layer from the upper layer of the layer is regarded as the service data unit (SDU) of the layer, and becomes the protocol data unit (protocol data unit) after layer encapsulation. unit, PDU), and then passed to the next layer. For example, the data received by the PDCP layer entity from the upper layer is called PDCP SDU, the data sent by the PDCP layer entity to the lower layer is called PDCP PDU; the data received by the RLC layer entity from the upper layer is called RLC SDU, and the data sent by the RLC layer entity to the lower layer Called RLC PDU. Among them, data can be transmitted between different layers through corresponding channels. For example, data can be transmitted between the RLC layer entity and the MAC layer entity through a logical channel (LCH), and the MAC layer entity and the physical layer entity can be transmitted through the A transport channel to transmit data.

Exemplarily, according to Fig. 2b, it can also be seen that the terminal device also has an application layer and a non-access layer; wherein, the application layer can be used to provide services to applications installed in the terminal device, for example, the Downlink data can be sequentially transmitted from the physical layer to the application layer, and then provided by the application layer to the application program; for another example, the application layer can obtain the data generated by the application program, transmit the data to the physical layer in turn, and send it to other communication devices. The non-access layer can be used for forwarding user data, for example, forwarding the uplink data received from the application layer to the SDAP layer or forwarding the downlink data received from the SDAP layer to the application layer.

(2) CU and DU

In this embodiment of the present application, the access network device may include one or more centralized units (centralized units, CUs) and one or more distributed units (distributed units, DUs), and multiple DUs may be centrally controlled by one CU. As an example, an interface between a CU and a DU may be referred to as an F1 interface, wherein a control plane (control panel, CP) interface may be an F1-C, and a user plane (user panel, UP) interface may be an F1-U. The CU and DU can be divided according to the protocol layer of the wireless network: for example, as shown in Figure 2c, the functions of the PDCP layer and above are set in the CU, and the functions of the protocol layers below the PDCP layer (such as the RLC layer and the MAC layer, etc.) are set in the DU.

It can be understood that the above division of the processing functions of CU and DU according to the protocol layer is only an example, and can also be divided in other ways, for example, the functions of the protocol layer above the RLC layer are set in the CU, and the RLC layer and the following protocol layers. The function of the CU is set in the DU. For example, the CU or DU can be divided into functions with more protocol layers. For example, the CU or DU can also be divided into partial processing functions with protocol layers. In one design, some functions of the RLC layer and functions of the protocol layers above the RLC layer are placed in the CU, and the remaining functions of the RLC layer and the functions of the protocol layers below the RLC layer are placed in the DU. In another design, the functions of the CU or DU can also be divided according to the service type or other system requirements, for example, by the delay, the functions whose processing time needs to meet the delay requirements are set in the DU, and do not need to meet the delay. The required functionality is set in the CU. In another design, the CU may also have one or more functions of the core network. Exemplarily, the CU can be set on the network side to facilitate centralized management; the DU can have multiple radio functions, or the radio functions can be set remotely. This embodiment of the present application does not limit this.

Exemplarily, the functions of the CU may be implemented by one entity, or may also be implemented by different entities. For example, as shown in Figure 2d, the functions of the CU can be further divided, that is, the control plane and the user plane can be separated and implemented by different entities, namely the control plane CU entity (ie the CU-CP entity) and the user plane CU entity. (ie the CU-UP entity), the CU-CP entity and the CU-UP entity can be coupled with the DU to jointly complete the functions of the RAN device. The interface between the CU-CP entity and the CU-UP entity may be the E1 interface, the interface between the CU-CP entity and the DU may be the F1-C interface, and the interface between the CU-UP entity and the DU may be the F1-U interface interface. Among them, one DU and one CU-UP can be connected to one CU-CP. Under the control of the same CU-CP, one DU can be connected to multiple CU-UPs, and one CU-UP can be connected to multiple DUs.

Based on FIG. 2d, FIG. 2e is a schematic diagram of the distribution of an air interface protocol stack. As shown in Figure 2e, for both the user plane and the control plane, the air interface protocol stack may be RLC, MAC, and PHY in the DU, and PDCP and above protocol layers in the CU.

It should be noted that: in the architectures shown in the foregoing Figures 2c to 2e, the signaling generated by the CU may be sent to the terminal device through the DU, or the signaling generated by the terminal device may be sent to the CU through the DU. The DU may not parse the signaling, but directly encapsulate it through the protocol layer and transparently transmit it to the terminal device or CU. In the following embodiments, if the transmission of such signaling between the DU and the terminal device is involved, at this time, the sending or receiving of the signaling by the DU includes this scenario. For example, the signaling of the RRC or PDCP layer will eventually be processed as the data of the physical layer and sent to the terminal device, or converted from the received data of the physical layer. Under this architecture, the signaling of the RRC or PDCP layer can also be considered to be sent by the DU, or sent by the DU and the radio frequency device.

3. CN

As shown in Figure 2a, CN includes a network exposure function (NEF) 231, a network storage function (NRF) 232, a policy control function (PCF) 233, a unified data management (unified) data management, UDM) network element 234, application function (AF) 235, authentication server function (AUSF) 236, access and mobility management function (AMF) 237, session A session management function (SMF) 238, a user plane function (UPF) 239 and (wireless). For convenience of description, the access network device (which may also be referred to as a base station) mentioned later in the embodiments of this application is described by taking the RAN as an example. The core network equipment mentioned later in the embodiments of this application may be understood as a general term for CN functional network elements.

The AMF network element is the control plane network element provided by the operator's network. It is responsible for the access control and mobility management of the terminal equipment accessing the operator's network, such as the management of mobility status, the allocation of user temporary identities, and the authentication and authorization of users. .

The SMF network element is the control plane network element provided by the operator's network and is responsible for managing the PDU sessions of the terminal equipment. A PDU session is a channel for transmitting PDUs. Terminal devices need to communicate PDUs with the DN through the PDU session. The PDU session is established, maintained and deleted by the SMF network element. SMF network elements include session management (such as session establishment, modification and release, including tunnel maintenance between UPF and RAN), selection and control of UPF network elements, service and session continuity (SSC) mode selection, Session related functions such as roaming.

The UPF network element is the gateway provided by the operator, and is the gateway for the communication between the operator's network and the DN. UPF network elements include user plane-related functions such as packet routing and transmission, packet detection, quality of service (QoS) processing, legal interception, upstream packet detection, and downstream packet storage.

The PCF network element is a control plane function provided by the operator, and is used to provide the SMF network element with the policy of the PDU session. The policies may include charging-related policies, QoS-related policies, authorization-related policies, and the like.

The AF network element is a functional network element that provides various business services, can interact with the core network through other network elements, and can interact with the policy management framework for policy management.

In addition, although not shown, other possible network elements may also be included in the CN, such as network exposure function (NEF), network element unified data repository (unified data repository, UDR) network element.

4. DN

As shown in FIG. 2a, the data network DN 220, which may also be referred to as a packet data network (PDN), is usually a network outside the operator's network, such as a third-party network. The operator network can access multiple data network DNs 220, and a variety of services can be deployed on the data network DNs 220, which can provide services such as data and/or voice for the terminal device 210. For example, the data network DN 220 can be a private network of a smart factory, the sensors installed in the workshop of the smart factory can be terminal devices 210, and the control server of the sensor is deployed in the data network DN 220, and the control server can provide services for the sensors. The sensor can communicate with the control server, obtain the instruction of the control server, and transmit the collected sensor data to the control server according to the instruction. For another example, the data network DN 220 may be an internal office network of a company, and the mobile phones or computers of employees of the company may be terminal devices 210, and the mobile phones or computers of the employees can access information, data resources, etc. on the internal office network of the company.

In Figure 2a, Nnef, Nausf, Nnrf, Namf, Npcf, Nudm, Nsmf, Naf, N1, N2, N3, N4 and N6 are interface serial numbers. For the meanings of these interface serial numbers, please refer to the meanings defined in the relevant standard protocols, which are not limited here.

In the following, the data network DN is a video data network, and the terminal device accesses the video data resources in the video data network through the access network device and the core network device as an example. Please refer to FIG. 3 , which is a schematic diagram of a system architecture provided by an embodiment of the present application. As shown in FIG. 3 , the system architecture includes a terminal device 30 , an access network device 31 , a core network device 32 and a video data network 33 . It should be noted that FIG. 3 takes one terminal device, one access network device, and one core network device as an example, and the system architecture may also include multiple terminal devices, multiple access network devices, and multiple core network devices. , which is not specifically limited here.

The core network device 32 obtains video data (including data packets of multiple frame types or data packets of multiple coding layers) from the video data network 33, and then divides the data packets into Different QoS flows. Specifically, the core network device 32 may map data packets of the same frame type or data packets of the same coding layer to a QoSflow for transmission, and set a core network sequence number for each data packet. When the access network device 31 receives the data packets in the multiple QoS flows transmitted by the core network device 32, it sets the access network sequence number for each data packet according to the receiving sequence of each data packet, and stores the data of each QoS flow The packet is mapped to the data radio bearer (DRB) of the air interface for data transmission. After receiving the data packets transmitted by each DRB, the terminal device 30 submits the data packets to the upper protocol layer according to the sequence in which the UE receives the data packets, and the upper protocol layer (eg, the application layer) decodes the data packets to obtain video content.

Generally speaking, data packets of multiple frame types or data packets of multiple coding layers received by the core network device 32 are associated with each other, so there are certain requirements on the transmission sequence, but the core network device 32 will After the packets are mapped to different QoS streams according to the transmission requirements, in the process of transmission to the access network equipment, the transmission of each QoS stream is relatively independent, and the correlation between the original video data packets is not considered. The data packet transmission is not synchronized, which in turn leads to a decrease in the success rate of video decoding.

Embodiments of the present application specifically provide a data transmission method, through which media data flows from a core network device through an access network device, and then is transmitted by the access network device to a terminal device, and then the terminal device acquires and processes it. In the process of the media data, ensuring the synchronization of the transmission of each data stream can also be understood as ensuring that the association relationship (sequence relationship or decoding association relationship) between the data packets satisfies the decoding requirements.

The data transmission method provided by the embodiment of the present application is further described in detail below:

Referring to FIG. 4 , FIG. 4 is a schematic flowchart of a data transmission method provided by an embodiment of the present application, where the data transmission method is a downlink data transmission method. As shown in FIG. 4 , the data transmission method includes the following S401-S403. The execution body of the method shown in FIG. 4 may be an access network device, or the execution body may be a chip of the access network device. Fig. 4 takes the access network device as the execution subject of the method as an example for description. in:

S401. The access network device receives first indication information, where the first indication information is used to indicate the transmission sequence of at least two data packets.

For example, the access network device receives multiple data packets sent by the core network device, and simultaneously receives the first indication information about the transmission sequence of each data packet.

Specifically, the first indication information may have the following two forms:

Form 1. The first indication information may be carried outside the above-mentioned multiple data packets. Exemplarily, in addition to receiving multiple data packets sent by the core network device, the access network device also receives indication information sent by the core network device, where the indication information indicates the transmission sequence of these data packets.

Form 2. The first indication information may also be carried in the above-mentioned multiple data packets, and is the indication information carried by the multiple data packets themselves. Exemplarily, the access network device determines the sequence of sending the data packets to the UE according to the sequence numbers carried in the data packets.

It should be known that the above-mentioned transmission sequence may be a direct transmission sequence of each data packet, or may be a transmission rule of each data packet. Exemplarily, as shown in FIG. 5 , the core network equipment divides the data packets into two QoS flows: QoS flow 1 and QoS flow 2 according to the transmission requirements of different data packets, and transmits the data packets to the access network equipment through two transmission channels. QoS flow 1 and QoS flow 2, ie, QoS flow 1 and QoS flow 2, may be transmitted through different GTP-U channels or through different PDU sessions. The data packet in QoS flow 1 is an audio data packet, and the audio data packet includes: data packet A1 and data packet A2; the data packet in QoS flow 2 is a picture data packet, and the picture data packet includes: data packet B1, Packet B2, Packet B3 and Packet B4. Among them, the pictures of the data package B1 and the data package B2 correspond to the audio of the data package A1 (or have a synchronous decoding relationship), and the pictures of the data package B3 and B4 correspond to the audio of the data package A2 (or have a synchronous decoding relationship) synchronous decoding relationship). In this case, the transmission sequence indicated by the first indication information received by the access network device is the direct transmission sequence of each data packet, that is, the data packets transmitted in sequence are: data packet B1, data packet B2, data packet A1, data packet Packet B3, Packet B4, Packet A2. Or, the transmission sequence indicated by the first indication information received by the access network device is each data packet transmission rule, for example, the transmission rule is: 2 data packets in

QoS flow

2 and 1 data packet in QoS flow 1 are alternately performed Transmission, that is, after each transmission of two QoS flow 2 data packets, one QoS flow 1 data packet is immediately transmitted.

It should be known that the sequence between the step of receiving the multiple data packets and the step of receiving the first indication information by the access network device may be determined according to the application scenario, which is not limited in this application. That is to say, it can be understood that the access network device can receive the first indication information indicating the transmission order of each data packet after receiving multiple data packets; it can also be that the access network device can receive the first indication information indicating the transmission order of each data packet before receiving the multiple data packets. The first indication information of the sequence; it may also be that the access network device receives the first indication information indicating the transmission sequence of each data packet while receiving multiple data packets.

Next, this application introduces the first indication information indicating the transmission sequence of data packets:

In a possible implementation, the access network device receives the first indication information from the core network device. In other words, the first indication information is sent by the core network device, that is, it can be understood that after the core network device receives the encoded video data, it is based on the instructions of the server or other core network devices, or according to regulations. The mapping rule determines the multiple data packets corresponding to the video data and the transmission order between the respective data packets. Further, the core network device sends multiple data packets to the access network device, and indicates the transmission sequence of each data packet.

Optionally, the data packet and the first indication information corresponding to the video data may also be forwarded to the access network device by other access network devices. For example, in the scenario where the terminal device performs a serving cell handover, the terminal device leaves the coverage of the source base station. When entering the coverage area of the target base station, the terminal device will switch from the serving cell of the source base station to the serving cell of the target base station. After the terminal device is connected to the target base station, there are still some data packets in the source base station that are not forwarded to the terminal device. In this case, the source base station sends the part of the data packets and the first indication indicating the transmission sequence of the data packets to the target base station. information. So that after the terminal device connects to the target base station and completes the serving cell handover, the target base station sends data packets to the terminal device according to the transmission sequence indicated by the first indication information.

In a possible implementation, the first indication information is core network sequence numbers of at least two data packets, that is, it can be understood that the first indication information is Form 2 in S401. The core network serial number may be a GTP-U serial number (serial number, SN) or another SN other than the GTP-U SN, such as a QFI serial number, which is not specifically limited in this application.

Exemplarily, taking the core network serial number as GTP-USN as an example, the core network equipment divides the data packets into two QoS flows according to the transmission requirements of different data packets: QoS flow 1 and QoS flow 2, wherein, QoS flow 1 The data packet in is an audio data packet, and the audio data packet includes: data packet A1 and data packet A2; the data packet in QoS flow 2 is a picture data packet, and the picture data packet includes: data packet B1 and data packet B2. As shown in Figure 6, if the core network equipment transmits QoS flow 1 and QoS flow 2 to the access network equipment through the same transmission channel, that is, QoS flow 1 and QoS flow 2 are transmitted through a GTP-U channel or a PDU session . In this case, the core network equipment indicates the transmission sequence to the access network equipment through the GTP-USN. For example, the core network equipment sets the GTP-USN of the data packet B1 to 1 and the GTP-USN of the data packet A1 to 2. The GTP-U SN of the data packet B2 is set to 3, and the GTP-U SN of the data packet A2 is set to 4, which means that the core network equipment transmits the access network equipment indicated by the core network serial number of each data packet. The sequence is: packet B1, packet A1, packet B2, and packet A2.

In a possible implementation, the at least two data packets belong to at least two QoS flows, and the first indication information is further used to indicate that the data packets of the at least two QoS flows are related to each other. Wherein, the data packets of the at least two QoS flows are correlated with each other, and the data packets of the at least two QoS flows have a time sequence relationship, or the data packets of the at least two QoS flows have a decoding relationship. Further, the access network device determines the transmission sequence of the data packets of the at least two QoS flows according to the association relationship between the data packets of the at least two QoS flows. Specifically, a preset transmission rule is stored in the access network device. When the core network device indicates that at least two QoS flows are related to each other, the access network device needs to transmit according to the preset transmission rule. For example, the preset transmission The rule is: if the interrelated QoS flows are alternately transmitted, the access network equipment alternately transmits data packets of different QoS flows. It should be known that the preset transmission rule can be adjusted according to the application scenario, which is not specifically limited.

Exemplarily, the data packets of each QoS flow in the data packets of the at least two QoS flows have a time sequence relationship, which can be understood as the data to be transmitted corresponds to QoS flow 1, QoS flow 2, and QoS flow 3. The data packet in QoS flow 1 is the I frame data packet of the data to be transmitted, the data packet in QoS flow 2 is the P frame data packet of the data to be transmitted, and the data packet in QoS flow 3 is the B frame data packet of the data to be transmitted. . Since there is a timing relationship among I frame data packets, P frame data packets and B frame data packets, the P frame data packets in QoS flow 2 depend on the previous frame (which can be the I frame in QoS flow 1 or the P frame in QoS flow 2). frame) data packets for transmission, the B frame data packets in QoS flow 3 need to rely on the previous frame (it can be an I frame in QoS flow 1 or a P frame in QoS flow 2) data packets and the next frame (I frame in QoS flow 1). or P frames in QoS flow 2) data packets are transmitted.

Optionally, the first indication information is also used to indicate that at least two QoS flows are related to each other, that is, it indicates that there is a decoding connection between the data packets of each QoS flow, for example, each data packet in QoS flow 1 corresponds to a QoS flow. 2 in every two packets. 5, the data to be transmitted corresponds to QoS flow 1 and QoS flow 2, wherein, the data packet in QoS flow 1 is the audio data packet of the data to be transmitted, and the data packet of QoS flow 2 is the audio data packet of the data to be transmitted. The picture data packet of the transmission data packet, 1 audio data packet in QoS flow 1 corresponds to 2 picture data packets in QoS flow 2. In this case, there is a decoding connection between the data packet of QoS flow 1 and the data packet of QoS flow 2, that is, the data packet A1 in QoS flow 1 and the data packet B1 and data in QoS flow 2 If there is a transmission sequence requirement between the packets B2, the transmission needs to be performed according to the transmission sequence requirement between the data packets of the QoS flow 1 and the data packets of the QoS flow 2.

S402. The access network device sets the access network sequence number for at least two data packets according to the transmission sequence.

In other words, after receiving the at least two data packets, the access network device sets the access network sequence number for each data packet according to the transmission sequence indicated in the foregoing first indication information.

In an example, the first indication information is the form 1 in S401. Taking the first indication information as the core network serial number and the core network serial number as GTP-USN as an example, the transmission sequence is: the GTP of the data packet B1 - USN is 1, GTP-USN of packet A1 is 2, GTP-USN of packet B2 is 3, and GTP-USN of packet A2 is 4. Taking the access network serial number as the PDCP SN as an example, the access network device can set the access network serial number of each data packet according to the transmission sequence as: the PDCP SN of the data packet B1 is 1, and the PDCP SN of the data packet A1 is 2, the PDCP SN of the data packet B2 is 3, and the PDCP SN of the data packet A2 is 4.

In another example, the first indication information is Form 2 in S401, and the transmission sequence indicated by the first indication information is data packet B1, data packet A1, data packet B2, and data packet A2. At this time, the access network device can set the access network sequence number of each data packet according to the transmission sequence as follows: the PDCP SN of the data packet B1 is 1, the PDCP SN of the data packet A1 is 2, and the PDCP SN of the data packet B2 is 3, and the PDCP SN of packet A2 is 4.

In yet another example, the first indication information is Form 2 in S401, and the transmission sequence indicated by the first indication information is data packet B1, data packet A1, data packet B2, and data packet A2. When different QoS flows are mapped to different radio bearers, the access network device can also set the access network sequence number of each data packet for QoS flow 2 (including data packet B1 and data packet B2): PDCP of data packet B1 The SN is 1, the PDCP SN of the data packet B2 is 2; for QoS flow 1 (including the data packet A1 and the data packet A2), the access network sequence number of each data packet is set as the PDCP SN of the data packet A1, and the data packet A2 The PDCP SN is 2. It can be seen that the serial number of the access network at this time does not indicate the delivery order of each data packet. At this time, different radio bearers are required to be delivered together, that is, the access network device should also generate third indication information according to the first indication information. The third indication information It is used to indicate the delivery order of each data packet (in this example, data packet B1, data packet B2, data packet A1, and data packet A2) of the terminal device. This situation will be described in detail later, and will not be described here. narrative.

S403. The access network device sends the at least two data packets to the terminal device according to the transmission sequence.

The access network device sends each data packet to the UE through at least one DRB according to the transmission sequence of each data packet. For example, as shown in Figure 5, the core network device transmits the audio data packets (including data packet A1 and data packet A2) of QoS flow 1 and the picture data packets (data packet B1, data packet B2) of QoS flow 2 to the access network device , Packet B3 and Packet B4). The transmission sequence indicated by the first indication information is: 2 picture data packets and 1 audio data packet are alternately transmitted. In this case, the access network device sends data packet B1, data packet B2, data packet A1, data packet B3, data packet B4, data packet A2, etc. to the terminal device sequentially through multiple DRBs.

For the UE side, after receiving the data packets, the UE can sort the data packets of each DRB according to the access network sequence number of each data packet. If the UE detects data packet loss according to the access network sequence number of each data packet, the UE may send feedback information to the access network device to request the access network device to retransmit the lost data packet. Exemplarily, the access network sequence number of each data packet is: the PDCP SN of the data packet B1 is 1, the PDCP SN of the data packet A1 is 2, the PDCP SN of the data packet B2 is 3, and the PDCP SN of the data packet A2 is 4. . If the UE sorts according to the access network sequence number and finds that there is no data packet B2 with a PDCP SN of 3, the UE determines that the data packet B2 is lost, and sends a request message to the access network device for retransmission of the data packet B2. If the UE detects that the data packets are repeated according to the access network serial number of each data packet, the UE will lose the repeated data packets. For example, the access network serial number of each data packet is: the PDCP SN of the data packet B1 is 1, the data packet The PDCP SN of A1 is 2, the PDCP SN of packet B2 is 3, and the PDCP SN of packet A2 is 4. If the UE sorts according to the access network sequence number and finds two data packets A1 whose PDCP SN is 2, the UE determines that the data packets A1 are repeated and discards any data packet A1.

In a possible implementation, the access network device generates third indication information based on the first indication information, where the third indication information is used to indicate the delivery order of the at least two data packets, and further, the access network device sends the terminal device to the the third indication information. The delivery order is the order in which the terminal device submits the data packets to the upper layer according to the communication protocol layer of the access network, such as the order of the transmission control protocol (transmission control protocol, TCP) or the Internet protocol (internet protocol, IP) layer, which ultimately guarantees At the application layer, the UE can decode each data packet according to the delivery order, so as to correctly parse the content carried by the data packet.

The following is divided into two application scenarios to introduce the submission order:

Application scenario 1: There is no common protocol layer entity between different radio bearers between the UE and the access network device, wherein the common protocol layer entity can process PDCP data packets from different devices (ie, the UE and the access network device), For example, the common protocol layer entity sorts the data packets from different PDCPs, that is, the common protocol layer entity on the UE side can sort the data packets processed by the PDCP of the access network device. The common protocol layer entity may be an SDAP entity or an entity other than SDAP (eg, a newly defined entity), which is not specifically limited.

In this application scenario, the access network transmits the data packets processed by the PDCP of the access network device through multiple DRBs, because there is no common protocol layer entity between different radio bearers between the UE and the access network device at this time , so the UE processes the data packets from different DRBs separately, that is, the UE needs to coordinately process the data packets from each DRB. As shown in Figure 7a, the access network device sends multiple data packets to the core network device through two DRBs, then DRB1 includes data packet A1 and data packet A2, and DRB2 includes data packet B1 and data packet B2. At this time, the access network device can generate the third indication information (including the delivery order of each data packet) according to the transmission sequence of the data packets (in turn, the data packet A1, the data packet B1, the data packet A2, and the data packet B2), such as: Packet A1, Packet B1, Packet A2, Packet B2. Alternatively, the access network generates the third indication information (including the delivery rule of each data packet) as follows: the data packet of DRB1 and the data packet of DRB2 are delivered alternately. According to the third indication information, the terminal device performs cooperative processing and delivery on the data packets of DRB1 and DRB2, that is, according to the third indication information, the data packets of DRB1 and the data packets in DRB2 are alternately delivered to the upper layer, and the delivery order is: data packet A1 , Packet B1, Packet A2, Packet B2.

Application scenario 2: There is a common protocol layer entity between different radio bearers between the UE and the access network device. In this case, when the access network transmits multiple data packets processed by the PDCP of the access network device through multiple DRBs, the different DRB data packets can finally be aggregated into the common protocol layer entity of the UE, that is, the UE can The data packets from different DRBs are processed in the common protocol layer entity, such as deduplication or reordering of the data packets.

In this application scenario, the access network device will be able to indicate the delivery sequence of each data packet through the access network serial number, that is, the third indication information is the access network serial number of at least two data packets. Wherein, the access network serial number is SDAPSN, PDCP SN or the serial number of the newly defined protocol layer. As shown in Figure 7b, when a common protocol layer entity exists between the UE and the access network device, and the common protocol entity is a newly defined protocol layer entity (such as the NEW protocol layer entity in Figure 7b), the access network device can Through the access network sequence number (ie, the NEW SN in Figure 7b) set for each data packet, the terminal equipment is indicated to the terminal device in the order of delivery of each data packet. Exemplarily, in this case, the access network transmits multiple data packets through multiple DRBs, and sets the NEW SN of the data packet A1 in DRB1 to 1 and the NEW SN of the data packet B1 of DRB2 to 2. , the NEW SN of the data packet A2 in DRB1 is set to 3, and the NEW SN of the data packet B2 of DRB2 is set to 4. It can be understood that the delivery sequence of the data packets indicated by the access network device to the UE is: data packet A1, data packet B1, data packet A2, and data packet B2.

In a possible implementation, in order to improve the flexibility in the data transmission process, the access network device receives second indication information, where the second indication information is used to indicate the actual transmission position of the first data packet and the transmission sequence indicated in the transmission sequence. The maximum allowable deviation value between the transmission positions of the first data packet, where the first data packet is any one of the aforementioned at least two data packets. It should be known that the second indication information may be a QoS parameter, and the QoS parameter is carried in any of the foregoing indication information, which is not specifically limited in this application.

Exemplarily, the transmission order can be understood as indicating the transmission position of the data packets in each QoS flow. For example, QoS flow 1 includes data packets A1 and A2, and QoS flow 2 includes data packets B1, B2, and A2. B3 and packet B4. If the transmission sequence of the data packets in QoS flow 1 and QoS flow 2 is as shown in module 70 in Fig. 7c in sequence: data packet B1, data packet B2, data packet A1, data packet B3, data packet B4, and data packet A2, then It can be understood that the transmission sequence indicates that the transmission position of the data packet B1 in the QoS flow 2 is the first position, the transmission position of the data packet B2 is the second position, the transmission position of the data packet B3 is the fourth position, and the transmission position of the data packet B4. is the fifth bit, the transmission position of the data packet A1 in the QoS flow 1 is the third bit, and the transmission position of the data packet A2 is the sixth bit. In this case, if the maximum allowable deviation between the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission order is 1, then any of QoS Flow 1 and QoS Flow 2 is allowed Two packets at adjacent positions in the transmission sequence swap positions. Taking the first data packet as data A1 as an example, the access network allows the transmission position of the data packet A1 in the actual transmission to be moved one data packet position later than the transmission position of the data packet A1 in the transmission sequence, that is, the actual transmission sequence is shown in the figure. Module 71 in 7c is shown as: data packet B1, data packet B2, data packet B3, data packet A1, data packet B4, data packet A2; or the access network allows the position of data packet A1 in actual transmission than in the transmission sequence The transmission position of the data packet A1 is moved forward by one data packet position, that is, the actual transmission sequence is shown in the module 72 in Fig. 7c as follows: data packet B1, data packet A1, data packet B2, data packet B3, data packet B4, data packet A2.

In a possible implementation, the second indication information is further used to indicate the access network sequence number of the access network device currently transmitting the data packet in the first QoS flow and the access network sequence number currently transmitting the data packet in the second QoS flow The maximum allowable deviation between numbers.

For example, QoS flow 1 and QoS flow 2 are established at the same time, and the data packets in QoS flow 1 and the data packets in QoS flow 2 need to be transmitted synchronously (that is, the data packets in QoS flow 1 correspond to the data packets in QoS flow 2 one-to-one). ). In this case, if the maximum allowable deviation between the access network serial number currently transmitting the data packet in the first QoS flow and the access network serial number currently transmitting the data packet in the second QoS flow is 1, the access network The PDCP SN of the first data packet of the QoS flow 1 currently transmitted by the network device is 5, then the PDCP SN of the second data packet of the currently transmitted QoS flow 2 can be calculated to be 5 except that the PDCP SN of the second data packet is 5. SN can also be 6 or 4.

Similarly, the access network device may also generate, based on the second indication information, the maximum allowable deviation of the delivery position between the actual delivery position of the terminal device for the first data packet and the delivery position of the first data packet indicated in the delivery sequence. value, wherein the first data packet is any one of the at least two data packets. The access network device may also generate, based on the second indication information, the difference between the access network serial number indicating that the access network device currently transmits the data packet in the first QoS flow and the access network serial number currently transmitting the data packet in the second QoS flow. The maximum deviation allowed for transmission between. Furthermore, the terminal device may adjust the delivery sequence of each data packet according to the maximum deviation value of the delivery position or the maximum deviation value of the transmission.

It can be seen from the foregoing that each QoS flow of the same service has an association relationship. If the transmission of each QoS flow is relatively independent, that is, the association relationship between the data packets of each QoS flow is not considered, and each data packet with an association relationship will appear. The transmission is not synchronized, which in turn leads to a decrease in the success rate of video decoding. For example, the core network device divides the data packets into two QoS flows: QoS flow 1 and QoS flow 2 according to the QoS requirements of different data packets. Among them, there is an association relationship between the audio data packets (data packet A1 and data packet A2) in QoS flow 1 and the picture data packets (data packet B1, data packet B2, data packet B3 and data packet B4) in QoS flow 2 (or referred to as having a synchronous decoding relationship), and the pictures of the data packets B1 and B2 correspond to the audio of the data packet A1 (or referred to as having a synchronous decoding relationship), and the pictures of the data packets B3 and B4 correspond to the data packet A2 The audio corresponding to (or referred to as having a synchronous decoding relationship). In this case, when the core network device transmits QoS flow 1 and QoS flow 2 to the access network device, since the transmission of QoS flow 1 and QoS flow 2 by the core network device is relatively independent, that is, the core network device transmits QoS flow 1 and QoS flow 2 to the access network device. When sending the data packets of

QoS flow

1 and 2, the association relationship between the data packets of QoS flow 1 and the data packets of QoS flow 2 (also referred to as a corresponding relationship or a synchronous decoding relationship) is not considered. The order in which the access network receives the data packets will be affected by the transmission speed of the transmission channel between the access network device 31 and the core network device 32. The order in which the access network device 31 receives the data packets of QoS flow 1 and QoS flow 2 may be data. Packet A1, Packet B1, Packet A2, Packet B2, Packet B3, and Packet B4. When the access network device 31 sends the data packets of the QoS flow 1 and the QoS flow 2 to the terminal device 30 according to the order in which the data packets of the QoS flow 1 and the QoS flow 2 are received, the data packets of the QoS flow 1 and the QoS flow 2 are not considered. The relationship between the data packets, then the order in which the terminal equipment 30 receives the data packets is affected by the transmission speed of the logical channel between the terminal equipment 30 and the access network equipment 31. The receiving order of the terminal equipment for receiving the data packets may be: A1, data packet A2, data packet B1, data packet B2, data packet B3, data packet B4, further, if the terminal device performs video decoding according to the receiving order of the data packets received by itself, there will be a situation in which the audio and video are not synchronized. Causes video decoding to fail.

It can be seen that, by implementing the data transmission method described in FIG. 4 of the present application, when the data packets of each QoS flow corresponding to the target service have an association relationship, but the core network equipment transmits each QoS flow to the access network equipment, it performs independent transmission. (that is, the association relationship between each QoS flow data packet is not considered during transmission), in this case, the core network device can instruct the access network to transmit the data packet transmission of each QoS flow by generating first indication information The sequence can be understood as the core network device notifying the access network device of the association relationship of the data packets of each QoS flow through the first indication information. Further, after receiving the data packets of each QoS flow, the access network device can also transmit the data packets of each QoS flow to the terminal device according to the transmission sequence (or can be understood as the association relationship between the data packets of each QoS flow) to the terminal device, thereby Improve the reliability of the data received by the terminal device, so that the terminal device can correctly decode the data packets of each QoS flow corresponding to the target service according to the association relationship of the data packets of each QoS flow, and improve the decoding success rate of video data.

Please refer to FIG. 8. FIG. 8 is a schematic flowchart of another data transmission method provided by an embodiment of the present application, and the data transmission method is an uplink data transmission method. As shown in FIG. 8 , the data transmission method includes steps S801 to S804. The execution body of the method shown in FIG. 8 may be an access network device, or the execution body may be a chip of the access network device. FIG. 8 takes an access network device as an example of the execution subject of the method for description. in:

S801. The access network device receives first indication information, where the first indication information is used to indicate the transmission sequence of at least two data packets.

The access network receives first indication information, where the first indication information indicates the transmission sequence in which the core network device receives at least two data packets, where the transmission sequence may be the direct transmission sequence of each data packet (such as the data packets transmitted in sequence). are: data packet B1, data packet B2, data packet A1, data packet B3, data packet B4, data packet A2), and can also be the transmission rule of each data packet (for example, the transmission rule is: the data packet in QoS flow 1 Alternate transmission with the data packets in QoS flow 2, that is, after each transmission of a data packet of QoS flow 1, a data packet of QoS flow 2 is transmitted, and then a data packet of QoS flow 1 is transmitted... until the QoS is transmitted. all packets in flow 1 and QoS flow 2).

In a possible implementation, the access network device receives the first indication information from the core network device. In other words, the core network device determines the transmission rules between data packets of each QoS flow corresponding to the uplink data according to the instructions of the server or according to the instructions of other core network devices, or according to the specified mapping rules. Further, the core network The device sends the first indication information to the network access device to inform the access network device of the transmission sequence when transmitting the data packets of each QoS flow to the core network device after receiving the data packets of each QoS flow corresponding to the uplink data.

Optionally, the first indication information may also be forwarded to the access network device by other access network devices. For example, in a scenario where a terminal device performs a serving cell handover, if the terminal device leaves the coverage of the source base station and enters the coverage of the target base station, the terminal device will switch from the serving cell of the source base station to the serving cell of the target base station. After the terminal device is connected to the target base station, there are still some data packets in the source base station that have not been forwarded to the core network device. In this case, the source base station sends the part of the data packets to the target base station and indicates the transmission sequence of the data packets. an instruction message. So that after the terminal device connects to the target base station and completes the serving cell handover, the target base station sends data packets to the core network device according to the transmission sequence indicated by the first indication information.

In a possible implementation, the access network device receives second indication information, where the second indication information is used to indicate that the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence are allowed between The maximum deviation value of , wherein the first data packet is any one of the aforementioned at least two data packets. It should be known that the second indication information may be a QoS parameter, and the QoS parameter is carried in any of the foregoing indication information, which is not specifically limited in this application. Specifically, for the specific description of the maximum allowable deviation value between the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence, reference may be made to the relevant description in the foregoing embodiment S403, which is omitted here. Too much elaboration.

In a possible implementation, the second indication information is further used to indicate the difference between the access network sequence number of the terminal equipment currently transmitting the data packet in the first QoS flow and the access network sequence number currently transmitting the data packet in the second QoS flow The maximum allowable deviation between.

For example, the data packets in the QoS flow 1 and the data packets in the QoS flow 2 need to be transmitted synchronously (that is, the data packets in the QoS flow 1 correspond to the data packets in the QoS flow 2 one-to-one). In this case, if the terminal device is currently transmitting the access network sequence number of the data packet in the first QoS flow and the access network sequence number currently transmitting the data packet in the second QoS flow The maximum deviation value is 1, and the PDCP SN of the first data packet of the QoS flow 1 currently transmitted by the terminal device is 5, then the PDCP SN of the second data packet of the currently transmitted QoS flow 2 can be calculated to be 5. The PDCP SN of the second data packet may also be 6 or 4.

S802. The access network device receives at least two data packets sent by the terminal device.

The access network device receives at least two data packets of data to be transmitted uploaded by the terminal device. It can be understood that when the terminal device has data to be transmitted to be uploaded, the terminal device sends a resource acquisition request to the access network device to acquire transmission resources of the data to be transmitted. After the access network device allocates uplink transmission resources for the data to be transmitted, the UE sends the to-be-transmitted data to the access network device by using the uplink transmission resources.

In an application scenario, the access network device may send, to the UE, the transmission sequence of at least two data packets received by the access network device based on the transmission sequence of each data packet indicated in the first indication information. That is, in a possible implementation, the access network device generates fifth indication information based on the first indication information, where the fifth indication information is used to indicate the transmission order of the at least two data packets. Further, the access network device sends the fifth indication information to the terminal device, so that the terminal device sends at least two data packets to the access network device based on the transmission sequence indicated by the fifth indication information. In other words, the core network device sends to the access network device the transmission sequence of the data packets received by itself, and the access network device is required to send the data packets to the core network device in the transmission sequence. The access network device sends the transmission sequence of the data packets it receives to the terminal device, and the terminal device is required to send the data packets to the access network device in the transmission sequence.

Exemplarily, a QoS flow (including QoS flow 1 and QoS flow 2) is established between the core network device and the access network device, and a DRB (including DRB1 and DRB2) is established between the access network device and the UE. Wherein, DRB1 is used for mapping the data packets in the transmission QoS flow 1, and DRB2 is used for mapping the data packets in the transmission QoS flow 2. In this case, the access network device receives the transmission sequence indicated by the first indication information: the data packets of QoS flow 1 and the data packets of QoS flow 2 are transmitted alternately, which can be understood as the simultaneous transmission of 1 data packet of QoS flow 1 , QoS flow 2 also transmits 1 packet. The access network device generates the transmission sequence in the fifth indication information based on the transmission sequence in the first indication information: when DRB1 maps and transmits one data packet, DRB2 maps and transmits one data packet. Then, after the access network equipment allocates uplink transmission resources for the data to be transmitted, the UE uses the uplink transmission resources to determine the data volume of the logical channels corresponding to DRB1 and DRB2 according to the logical channel priority (logical channel priority, LCP). The DRB2 sends the multiple data packets of the data to be transmitted to the access network device.

It can be seen that when the transmission progress between the DRBs that transmit each data packet matches the transmission order of the QoS flow indicated by the first indication information, the access network device can be guaranteed to be in the transmission order between the data packets indicated in the first indication information. Each data packet is successfully sent to the core network device. In other words, when the transmission progress between the DRBs that transmit each data packet does not match the transmission order of the QoS flow indicated by the first indication information, the access network device will not use the data packet indicated in the first indication information. The transmission sequence of each data packet is sent to the core network device, which may cause the core network device to fail to obtain the data packet.

In order for the access network device to send each data packet to the core network device in the transmission sequence of the data packets indicated in the first indication information, in a possible implementation, the access network device sends fourth indication information to the terminal device, the The fourth indication information is used to adjust a parameter value of at least one logical channel, where the at least one logical channel is used to transmit at least two data packets. The parameter value includes one or more of logical channel priority, priority bit rate (PBR), and bucket size duration (BSD), and may also include other logic defined in the future. channel parameters.

It can be understood that, when the access network device is based on one or more of the following information: the transmission sequence indicated in the first indication information, the actual transmission position of the first data packet indicated in the second indication information is the same as that in the transmission sequence. The maximum allowable deviation value between the indicated transmission positions of the first data packet, or the access network serial number of the access network device currently receiving the data packet in the first QoS flow indicated in the second indication information and the current receiving second QoS The maximum allowable deviation value between the access network sequence numbers of the data packets in the flow, to determine the predetermined transmission progress requirement of the QoS flow corresponding to the transmission of uplink data on the logical channel (corresponding to the radio bearer) between the terminal equipment and the access network equipment , and dynamically adjust the parameter value of the logical channel corresponding to each DRB according to the predetermined transmission progress requirement, so that the mapping transmission speed between the DRBs transmitting each data packet is the same as the predetermined transmission progress requirement.

Exemplarily, as shown in FIG. 9 , the data packets of the data to be transmitted include: the audio data packets (including the data packets A1 and A2) of the QoS flow 1 and the picture data packets (the data packets B1 and the data packets) of the QoS flow 2. B2). A QoS flow (including QoS flow 1 and QoS flow 2) is established between the core network device and the access network device, and a DRB (including DRB1 and DRB2) is established between the access network device and the UE. Wherein, DRB1 is used for mapping the data packets in the transmission QoS flow 1, and DRB2 is used for mapping the data packets in the transmission QoS flow 2. The core network device sends first indication information to the access network device, and the transmission sequence of the data packets to be transmitted indicated by the first indication information is: data packet A1, data packet B1, data packet A2, and data packet B2, that is, QoS flow 1 The packets of QoS flow 2 are alternately transmitted. Based on the transmission sequence, the predetermined transmission progress requirement is obtained as follows: the transmission progress between DRB1 and DRB2 is the same, that is, the transmission speed of DRB1 is the same as the transmission speed of DRB2, which can also be understood as the PDCP SN of the transmission data packet in DRB1 and DRB2. The PDCP SN of the transmitted packet is the same. When the access network device detects that the PDCP SN of the data packet received through DRB1 is different from the PDCP SN of the data packet received through DRB2, the access network device sends the fourth indication information to the terminal device to the parameters of the logical channel corresponding to the DRB value to adjust. Specifically, when the access network device detects that the PDCP SN of the data packet received through DRB1 is greater than the PDCP SN of the data packet received through DRB2, it is determined that the transmission speed of DRB1 is too fast, and the access network device uses the fourth indication information to improve The transmission speed of DRB2 or reduce the transmission speed of DRB1. When the access network device detects that the PDCP SN of the data packet received through DRB1 is smaller than the PDCP SN of the data packet received through DRB2, it determines that the transmission speed of DRB1 is slow, and the access network device improves the transmission of DRB1 through the fourth indication information speed or reduce the transfer speed of DRB2.

Wherein, the aforementioned fourth indication information is a media access control layer (medium access control, MAC) control element (control element, CE) or downlink control information (downlink control information, DCI). Through such a method, the logical channel parameters can be dynamically configured in the data transmission process, without the terminal data transmission process.

It should be known that the fourth indication information can directly carry the target parameter value of the logical channel to be adjusted (that is, the adjusted parameter value) or the change amount of the parameter value, and can also carry at least one index value. The meaning of the index value can be predicted. Defined in the protocol or sent to the UE through radio resource control (RRC) signaling in advance, where the meaning of the index value can be to increase the parameter value by at least one level (it needs to be known that the one level corresponding to the one level parameter value is bit transmission speed) or reduce the parameter value by at least one level, and the size of the first level parameter value can be known by the UE in advance through the protocol. After receiving the signaling, the UE adjusts the parameters of the corresponding at least one logical channel according to the instructions of the signaling.

S803. The access network device sets the core network sequence number for the at least two data packets according to the transmission sequence.

The core network serial number may be a GTP-U serial number (serial number, SN) or other SN except the GTP-U SN, which is not specifically limited in this application.

Exemplarily, as shown in Figure 9, taking the core network serial number as GTP-USN as an example, when the transmission sequence is the data packets (data packet A1 and data packet A2) in QoS flow 1 and the data in QoS flow 2 The packets (data packet B1 and data packet B2) are transmitted synchronously, that is, when one data packet in QoS flow 1 is transmitted every time one data packet in QoS flow 2 is transmitted. In this case, the access network device can set the GTP-US SN of packet A1 to 1, the GTP-US SN of packet B1 to 2, the GTP-US SN of packet A2 to 3, and the GTP-US SN of packet A2 to 3. The GTP-USN of B2 is set to 4.

S804. The access network device sends the at least two data packets to the core network device according to the transmission sequence.

Exemplarily, when the transmission sequence is that the data packets (data packet A1 and data packet A2) in QoS flow 1 are transmitted synchronously with the data packets (data packet B1 and data packet B2) in QoS flow 2, that is, each QoS flow 1 is transmitted. When transmitting 1 packet in QoS flow 2 when transmitting 1 packet in QoS flow 2. Then, the access network device sends to the core network device in sequence: data packet A1, data packet B1, data packet A2, and data packet B2.

It can be seen that by implementing the data transmission method described in FIG. 8 , for uplink data transmission, in the process of ensuring that data is transmitted between various devices, the association relationship between each data packet is kept consistent, and each data packet can be dynamically adjusted. The transmission priority of the logical channel to ensure that the transmission progress of the data packet matches the transmission order.

Next, based on the method described in FIG. 8 , some solutions extended by the present application are introduced.

In the above S802, the adjustment of each logical channel parameter may also be performed by the terminal device. In a possible implementation, the fifth indication information is further used to indicate to the terminal device the maximum allowable deviation value between the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence, wherein the A data packet is any one of the at least two data packets, or the fifth indication information is further used to indicate to the terminal equipment that the terminal equipment currently transmits the access network sequence number of the data packet in the first QoS flow and the current transmission second The maximum allowed deviation between the access network sequence numbers of packets in a QoS flow. In this case, if the UE has the authority to adjust the logical channel parameter value, in the process of sending multiple data packets to the access network device, the UE is based on one or more of the following information: the first indication information The transmission sequence indicated in the second indication information, the maximum allowable deviation value between the actual transmission position of the first data packet indicated in the second indication information and the transmission position of the first data packet indicated in the transmission sequence, or the indication in the second indication information The maximum allowable deviation value between the access network serial number of the data packet in the first QoS flow currently transmitted by the terminal device and the access network serial number of the data packet in the current transmission of the second QoS flow, for the parameter value of at least one logical channel For adjustment, the at least one logical channel is used to transmit at least two data packets of uplink data.

In an application scenario, the fifth indication information is further used to indicate to the terminal device the maximum allowable deviation value between the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence, wherein the first The data packet is any one of at least two data packets.

If the terminal device detects that the actual transmission position of the first data packet is later than the transmission position of the first data packet indicated in the transmission sequence, and the actual transmission position of the first data packet is the same as the transmission position of the first data packet indicated in the transmission sequence If the deviation value between the transmission positions is greater than the aforementioned maximum deviation value (that is, it can be understood that the transmission speed of the logical channel for transmitting the first data packet is too slow), the terminal device increases the transmission of the first logical channel for transmitting the first data packet Speed, it should be known that the way for the terminal device to increase the transmission speed of the first logical channel may be: increasing the parameter value related to the transmission speed of the first logical channel by at least one step. It should be known that the transmission speed of a gear corresponding to a gear, the transmission speed corresponding to a specific gear is agreed by the terminal device and the access network device, and is not specifically limited here. For example, if the parameter value is increased by one gear, the The first logical channel increases the transmission speed of 1M/s.

If the terminal device detects that the actual transmission position of the first data packet is earlier than the transmission position of the first data packet indicated in the transmission sequence, and the actual transmission position of the first data packet is the same as the transmission position of the first data packet indicated in the transmission sequence If the deviation value between the transmission positions is greater than the aforementioned maximum deviation value (that is, it can be understood that the transmission speed of the logical channel for transmitting the first data packet is too fast), the terminal device reduces the transmission of the first logical channel for transmitting the first data packet speed. The manner in which the terminal device reduces the transmission speed of the first logical channel may be: reducing a parameter value related to the transmission speed of the first logical channel by at least one step. It should be known that the transmission speed of a gear corresponding to one gear, the transmission speed corresponding to a specific gear is agreed between the terminal device and the access network device, and is not specifically limited here. For example, if the parameter value is reduced by one gear, the The first logical channel increases the transmission speed of 1M/s.

In another scenario, the fifth indication information is further used to indicate to the terminal device the access network serial number of the data packet in the first QoS flow that the terminal device currently transmits and the access network serial number of the data packet in the second QoS flow currently transmitted by the terminal device The maximum allowable deviation between. The first logical channel (corresponding to the first DRB) between the terminal device and the access network device is used to map the first QoS flow for transmitting uplink data, and the second logical channel (corresponding to the second DRB) maps the second QoS for transmitting uplink data flow.

In this case, if the terminal device detects that the PDCP SN of the data packet in the first QoS flow is currently larger than the PDCP SN of the data packet in the second QoS flow, and the data packet in the first QoS flow is currently transmitted If the difference between the PDCP SN and the PDCP SN currently transmitting the data packet in the second QoS flow is greater than the allowable maximum deviation value, it can be understood that the transmission speed of the first logical channel is faster or the transmission speed of the second logical channel. slower. The terminal device can reduce the transmission speed of the first logical channel or increase the transmission speed of the second logical channel, that is, the terminal device reduces the transmission speed of the first logical channel by one level or the transmission speed of the second logical channel. The parameter value is increased by one step.

If the terminal device detects that the PDCP SN of the data packets in the current transmission of the first QoS flow is smaller than the PDCP SN of the data packets in the current transmission of the second QoS flow, and the PDCP SN of the data packets in the current transmission of the first QoS flow is the same as the PDCP SN of the data packets in the current transmission of the first QoS flow If the difference between the PDCP SNs of the data packets in the second QoS flow is greater than the maximum allowable deviation value, it can be understood that the transmission speed of the first logical channel is slower or the transmission speed of the second logical channel is faster. The terminal device can increase the transmission speed of the first logical channel or reduce the transmission speed of the second logical channel, that is, the terminal device can increase the transmission speed of the first logical channel by one step or the transmission speed of the second logical channel. Decrease the parameter value by one stop.

It should be noted that, although the embodiments in this application all take video services as examples, they are not limited to video services. The data transmission method of the present application can be applied to data transmission scenarios of various services, such as voice, augmented reality (AR), virtual reality (VR), or holographic communication and other services. Although the application scenarios of this application take the uplink data transmission scenario and downlink data transmission scenario between the terminal device and the access network device as a specific example, it is not limited to the uplink data transmission scenario and the downlink data transmission scenario between the terminal device and the access network device. Data transmission scenarios can also be applied to sidelink communication scenarios between terminal devices and other terminal devices, such as vehicle networking (vihicle to everything, V2X) or device-to-device (D2D) ) and other scenarios, the solution of the present invention can still be used for data transmission.

Referring to FIG. 10, FIG. 10 shows a schematic structural diagram of a communication apparatus 100 according to an embodiment of the present application. The communication device shown in FIG. 10 may be an access network device, a device in an access network device, or a device that can be matched and used with the access network device. The communication device 100 may also be a terminal device, or a device in a terminal device, or a device that can be matched and used with the terminal device. The communication apparatus shown in FIG. 10 may include a communication unit 1001 and a processing unit 1002 . specific:

In an implementation manner, when the communication apparatus 100 is an access network device, a device in an access network device, or a device that can be matched and used with an access network device, wherein:

The communication unit 1001 is used to receive first indication information, where the first indication information is used to indicate the transmission sequence of at least two data packets; the processing unit 1002 is used to set an access network for the at least two data packets according to the transmission sequence serial number; the communication unit 1001 is further configured to send the at least two data packets to the terminal device according to the transmission sequence.

In a possible implementation, the communication unit 1001 is specifically configured to receive the first indication information from the core network device.

In a possible implementation, the first indication information is core network sequence numbers of the at least two data packets.

In a possible implementation, the at least two data packets belong to at least two QoS flows, and the first indication information is further used to indicate that the data packets of the two QoS flows are related to each other.

In a possible implementation, the communication unit 1001 is further configured to receive second indication information, where the second indication information is used to indicate the difference between the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence The maximum allowable deviation value between the two data packets, wherein the first data packet is any one of the at least two data packets.

In a possible implementation, the processing unit 1002 is further configured to generate third indication information based on the first indication information, where the third indication information is used to indicate the delivery order of the at least two data packets; the access network device sends the terminal to the terminal. The device sends the third indication information.

In a possible implementation, the delivery order is the reading order of the at least two data packets by the terminal device.

In a possible implementation, the third indication information is access network sequence numbers of at least two data packets.

In a possible implementation, the access network serial number is a packet data convergence protocol PDCP serial number SN or a first protocol serial number, and the first protocol serial number is different from the PDCP SN.

The communication unit 1001 is used to receive first indication information, where the first indication information is used to indicate the transmission sequence of at least two data packets; the communication unit 1001 is used to receive at least two data packets sent by the terminal device; the processing unit 1002, is used for setting core network sequence numbers for the at least two data packets according to the transmission sequence; the communication unit 1001 is used for sending the at least two data packets to the core network device according to the transmission sequence.

In one possible implementation, the communication unit 1001 is further configured to send fourth indication information to the terminal device, where the fourth indication information is used to adjust a parameter value of at least one logical channel, and the at least one logical channel is used to transmit at least two data pack.

In a possible implementation, the fourth indication information is a medium access control layer control unit MAC CE or downlink control information DCI.

In a possible implementation, the processing unit 1002 is further configured to generate fifth indication information based on the first indication information, where the fifth indication information is used to indicate the transmission sequence of the at least two data packets; the communication unit 1001 is further configured to use for sending the fifth indication information to the terminal device.

In a possible implementation, the fifth indication information is further used to indicate the maximum allowable deviation value between the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence, wherein the first data packet Any of at least two packets.

In an implementation manner, when the communication apparatus 100 is a terminal device, a device in a terminal device, or a device that can be matched and used with a terminal device, wherein:

The communication unit 1001 is configured to receive fifth indication information sent by the access network device, where the fifth indication information is used to indicate the transmission sequence of the at least two data packets; the communication unit 1001 is further configured to send the access network to the access network according to the transmission sequence The network device sends the at least two data packets.

In a possible implementation, the processing unit 1002 is configured to set an access network sequence number for the at least two data packets based on the transmission sequence.

In a possible implementation, the processing unit 1002 is further configured to, based on the maximum allowable deviation value between the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence, perform the processing of the at least one logical channel. The parameter value is adjusted, and the at least one logical channel is used to transmit the at least two data packets.

As shown in FIG. 11 , a communication apparatus 110 provided by an embodiment of the present application is used to implement the functions of an access network device of the data transmission method during downlink data transmission or uplink data transmission. The apparatus may be an access network device or an apparatus for an access network. The means for the access network device may be a chip system or chip in the access network device. Wherein, the chip system may be composed of chips, and may also include chips and other discrete devices. Alternatively, the communication apparatus 110 shown in FIG. 11 is used to implement the functions of the terminal device of the data transmission method in the above-mentioned uplink data transmission. The apparatus may be a terminal device or an apparatus for a terminal device. The means for the terminal device may be a system-on-a-chip or a chip within the terminal device. Wherein, the chip system may be composed of chips, and may also include chips and other discrete devices.

The communication apparatus 110 includes at least one processor 1120, configured to implement the data processing function of the access network device or the data processing function of the terminal device in the method provided in the embodiment of the present application. The communication apparatus 110 may further include a communication interface 1110, which is configured to implement the sending and receiving operations of the access network device or the terminal device in the method provided in the embodiment of the present application. In this embodiment of the present application, the communication interface may be a transceiver, a circuit, a bus, a module or other types of communication interfaces, which are used to communicate with other devices through a transmission medium. For example, the communication interface 1110 is used for the apparatus in the communication apparatus 110 to communicate with other devices. The processor 1120 uses the communication interface 1110 to send and receive data, and is used to implement the methods described in the above method embodiments.

Communication device 110 may also include at least one memory 1130 for storing program instructions and/or data. Memory 1130 and processor 1120 are coupled. The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. The processor 1120 may cooperate with the memory 1130. The processor 1120 may execute program instructions stored in the memory 1130 . At least one of the at least one memory may be included in the processor.

The specific connection medium between the communication interface 1110 , the processor 1120 , and the memory 1130 is not limited in this embodiment of the present application. In the embodiment of the present application, the memory 1130, the processor 1120, and the communication interface 1110 are connected through a bus 1140 in FIG. 11. The bus is represented by a thick line in FIG. 11, and the connection between other components is only for schematic illustration. , is not limited. 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. 11, but it does not mean that there is only one bus or one type of bus.

When the communication apparatus 110 is specifically an apparatus used for access network equipment or terminal equipment, for example, when the communication apparatus 110 is specifically a chip or a chip system, the communication interface 1110 may output or receive baseband signals. When the communication apparatus 110 is specifically an access network device or a terminal device, the output or reception of the communication interface 1110 may be a radio frequency signal. In this embodiment of the present application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which can implement or The methods, steps and logic block diagrams disclosed in the embodiments of this application are executed. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the methods disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.

Embodiments of the present application further provide a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed, the method performed by the access network device in the above method embodiment is executed. accomplish.

Embodiments of the present application further provide a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed, the methods performed by the terminal device in the above method embodiments are implemented.

Embodiments of the present application further provide a computer program product, where the computer program product includes a computer program, when the computer program is executed, the method performed by the access network device in the above method embodiments is implemented.

Embodiments of the present application further provide a computer program product, where the computer program product includes a computer program, and when the computer program is executed, the method performed by the terminal device in the above method embodiment is implemented.

An embodiment of the present application further provides a communication system, where the communication system includes a terminal device and an access network device. The terminal device is configured to execute the method executed by the terminal device in the above method embodiments. The access network device is configured to perform the method performed by the access network device in the foregoing method embodiments.

It should be noted that, for the sake of simple description, the foregoing method embodiments are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the described action sequence. Because in accordance with the present application, certain steps may be performed in other orders or concurrently. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

The descriptions of the embodiments provided in this application may refer to each other, and the descriptions of the various embodiments have their own emphasis. For the parts that are not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments. For the convenience and brevity of description, for example, regarding the functions of the devices and devices provided in the embodiments of the present application, and the steps performed by them, reference may be made to the relevant descriptions of the method embodiments of the present application. There may be mutual reference, combination or reference.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present application. scope.

Claims

A data transmission method, characterized in that the method comprises:

The access network device receives first indication information, where the first indication information is used to indicate a transmission sequence of at least two data packets;

setting, by the access network device, an access network sequence number for the at least two data packets according to the transmission sequence;

The access network device sends the at least two data packets to the terminal device according to the transmission sequence.
The method according to claim 1, wherein the access network device receives the first indication information, comprising:

The access network device receives the first indication information from the core network device.
The method according to claim 1 or 2, wherein the first indication information is core network sequence numbers of the at least two data packets.
The method according to any one of claims 1-3, wherein the at least two data packets belong to at least two quality of service flows (QoS flows), and the first indication information is further used to indicate the at least two flows The packets of a QoS flow are correlated with each other.
The method according to any one of claims 1-4, wherein the method further comprises:

The access network device receives second indication information, where the second indication information is used to indicate the allowable difference between the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence. The maximum deviation value, wherein the first data packet is any one of the at least two data packets.
The method according to any one of claims 1-5, wherein the method further comprises:

The access network device generates third indication information based on the first indication information, where the third indication information is used to indicate a delivery order of at least two data packets;

The access network device sends the third indication information to the terminal device.
The method according to claim 6, wherein the third indication information is an access network sequence number of the at least two data packets.
A data transmission method, characterized in that the method comprises:

The access network device receives first indication information, where the first indication information is used to indicate a transmission sequence of at least two data packets;

receiving, by the access network device, the at least two data packets sent by the terminal device;

The access network device sets a core network sequence number for the at least two data packets according to the transmission sequence;

The access network device sends the at least two data packets to the core network device according to the transmission sequence.
The method according to claim 8, wherein the access network device receives the first indication information, comprising:

The access network device receives the first indication information from the core network device.
The method according to claim 8 or 9, wherein the method further comprises:

The access network device receives second indication information, where the second indication information is used to indicate the allowable difference between the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence. The maximum deviation value, wherein the first data packet is any one of the at least two data packets.
The method according to claim 10, wherein the method further comprises:

The access network device sends fourth indication information to the terminal device, where the fourth indication information is used to adjust a parameter value of at least one logical channel, and the at least one logical channel is used to transmit the at least two data packets .
The method according to claim 11, wherein the fourth indication information is a medium access control layer control unit MAC CE or downlink control information DCI.
The method according to any one of claims 8-12, wherein the method further comprises:

generating, by the access network device, fifth indication information based on the first indication information, where the fifth indication information is used to indicate a transmission order of the at least two data packets;

The access network device sends the fifth indication information to the terminal device.
The method according to claim 13, wherein the fifth indication information is further used to indicate that the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence are allowed between The maximum deviation value of , wherein the first data packet is any one of the at least two data packets.
A communication device, characterized in that the communication device comprises:

a communication unit, configured to receive first indication information, where the first indication information is used to indicate a transmission sequence of at least two data packets;

a processing unit, configured to set an access network sequence number for the at least two data packets according to the transmission sequence;

The communication unit is further configured to send the at least two data packets to the terminal device according to the transmission sequence.
The device according to claim 15, wherein the communication unit is specifically configured to:

The first indication information from the core network device is received.
The apparatus according to claim 15 or 16, wherein the first indication information is core network sequence numbers of the at least two data packets.
The apparatus according to any one of claims 15-17, wherein the at least two data packets belong to at least two quality of service flows (QoS flows), and the first indication information is further used to indicate the at least two flows The packets of a QoS flow are correlated with each other.
The device according to any one of claims 15-18, wherein the communication unit is further configured to:

Receive second indication information, where the second indication information is used to indicate the maximum allowable deviation value between the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence, wherein, The first data packet is any one of the at least two data packets.
The device according to any one of claims 15-19, wherein the processing unit is further configured to:

generating third indication information based on the first indication information, where the third indication information is used to indicate a delivery order of at least two data packets;

The communication unit is further configured to send the third indication information to the terminal device.
The apparatus according to claim 20, wherein the third indication information is an access network sequence number of the at least two data packets.
A communication device, characterized in that the communication device comprises:

a communication unit, configured to receive first indication information, where the first indication information is used to indicate a transmission sequence of at least two data packets;

The communication unit is further configured to receive the at least two data packets sent by the terminal device;

a processing unit, configured to set a core network sequence number for the at least two data packets according to the transmission sequence;

The communication unit is further configured to send the at least two data packets to the core network device according to the transmission sequence.
The device according to claim 22, wherein the communication unit is specifically configured to:

Receive first indication information from the core network device.
The device according to claim 22 or 23, wherein the communication unit is further configured to:

Receive second indication information, where the second indication information is used to indicate the maximum allowable deviation value between the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence, wherein, The first data packet is any one of the at least two data packets.
The device according to claim 24, wherein the communication unit is further configured to:

Send fourth indication information to the terminal device, where the fourth indication information is used to adjust a parameter value of at least one logical channel, and the at least one logical channel is used to transmit the at least two data packets.
The apparatus according to claim 25, wherein the fourth indication information is a medium access control layer control unit MAC CE or downlink control information DCI.
The apparatus according to any one of claims 22-26, wherein the processing unit is further configured to generate fifth indication information based on the first indication information, where the fifth indication information is used to indicate the at least The transmission order of the two data packets;

The communication unit is further configured to send the fifth indication information to the terminal device.
The apparatus according to claim 27, wherein the fifth indication information is further used to indicate that the actual transmission position of the first data packet and the transmission position of the first data packet indicated in the transmission sequence are allowed between The maximum deviation value of , wherein the first data packet is any one of the at least two data packets.
A communication device, characterized in that it comprises a processor and a memory, the processor and the memory are coupled, and the processor is configured to implement the method according to any one of claims 1-7, or the processing A device is used to implement the method of any of claims 8-14.
A communication device, characterized by comprising a processor and an interface circuit, the interface circuit being configured to receive signals from other communication devices other than the communication device and transmit to the processor or transfer signals from the processor The signal is sent to other communication devices other than the communication device, and the processor is used to implement the method according to any one of claims 1-7 by means of a logic circuit or executing code instructions, or, the processor The method of any of claims 8-14 is implemented by means of logic circuits or by executing code instructions.
A computer-readable storage medium, characterized in that, a computer program or instruction is stored in the storage medium, and when the computer program or instruction is executed by a communication device, any one of claims 1-7 is implemented. The method of, or, implementing the method of any one of claims 8-14.
A computer program product, characterized in that, when a computer reads and executes the computer program product, it causes the computer to execute the method described in any one of claims 1-7, or causes the computer to execute the method described in any one of claims 8-14. The method of any one.