CN112423393B

CN112423393B - Data transmission method and device

Info

Publication number: CN112423393B
Application number: CN201910786453.4A
Authority: CN
Inventors: 李添泽; 马驰翔; 向铮铮; 卢磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-08-23
Filing date: 2019-08-23
Publication date: 2024-04-16
Anticipated expiration: 2039-08-23
Also published as: CN112423393A; WO2021036910A1

Abstract

The application provides a data transmission method and device, and relates to the fields of vehicle-to-vehicle communication, V2X, vehicle networking, intelligent network vehicle networking, intelligent driving and the like. The method comprises the following steps: the method comprises the steps that a first terminal device receives indication information, wherein the indication information is used for indicating a transmission mode of the first terminal device, and the transmission mode comprises one or more transmission modes of a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode or a cooperative transmission mode; the first terminal device transmits data according to the transmission mode configured by the indication information. The method is applied to the communication process between the terminals, and can enrich the data transmission modes between the terminals.

Description

Data transmission method and device

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a data transmission method and apparatus.

Background

With the development of wireless communication technology, there is an increasing demand for decoding and communicating with surrounding persons or things, and thus, device-to-device (D2D) technology has grown. D2D technology allows direct discovery and direct communication between multiple D2D enabled devices. However, the requirement of the internet of vehicles is extremely high in safety, and the requirement of time delay is high, and the low time delay cannot be realized based on the D2D technology at present, so that the requirement of the internet of vehicles cannot be met.

In order to improve the security of the internet of vehicles, in a network based on long term evolution (long term evolution, LTE) technology proposed by the third generation partnership project (the 3rd generation partnership project,3GPP), internet of vehicles technology of vehicle-to-anything communication (V2X) is proposed. V2X communication refers to communication of the vehicle with anything outside, as shown in fig. 1, V2X includes vehicle-to-vehicle communication (vehicle to vehicle, V2V), vehicle-to-pedestrian communication (vehicle to pedestrian, V2P), vehicle-to-infrastructure communication (vehicle to infrastructure, V2I), vehicle-to-network communication (vehicle to network, V2N). In V2X, unlike Uplink (UL) and Downlink (DL) transmissions between a terminal and a base station, direct transmission between devices is possible, and a direct link between 3GPP devices is defined as a Sidelink (SL).

The LTE V2X solves part of basic requirements of the Internet of vehicles, but for application scenes such as full intelligent driving, automatic driving and the like in the future, the LTE V2X in the present stage cannot be effectively supported. With the development of the fifth generation communication technology (the 5th generation,5G) and the New Radio (NR) technology, how to meet the requirements of a wider application scenario in 5g NR v2x, so as to further improve the user experience is called as a problem to be solved.

Disclosure of Invention

The embodiment of the application provides a data transmission method and device, which can meet the requirement of wider application scenes.

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

in a first aspect, an embodiment of the present application provides a data transmission method, where the method may be performed by a first terminal device, and the first terminal device may be a terminal, or may be a device capable of supporting the terminal to implement a terminal function, and may be used in a matching manner with the terminal, for example, may be a device in the terminal (such as a chip system in the terminal). The method comprises the following steps:

the method comprises the steps that a first terminal device receives indication information, wherein the indication information is used for indicating a transmission mode of the first terminal device, and the transmission mode comprises one or more transmission modes of a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode or a cooperative transmission mode; the first terminal device transmits data according to the transmission mode configured by the indication information.

In this way, the first terminal apparatus can perform data transmission in the multipath transmission mode, or the multi-hop transmission mode, or the single-hop transmission mode or the cooperative transmission mode. The data transmission modes of the terminal device are enriched, so that the terminal device is not limited to direct communication, namely, the data transmission from the sender to the receiver directly.

In one possible design, the first terminal device may be a first-hop terminal device, i.e. may be the source sender of the data, or may be another-hop terminal device on the transmission path. The first terminal device receives indication information, including:

the first terminal device receives downlink control information, DCI, from a network device, the DCI including the indication information.

In this embodiment of the present application, there are two ways of configuring a transmission policy for a terminal device:

in configuration 1, the network device notifies the first terminal device (i.e., the first-hop terminal device) of the transmission policies of all the terminal devices on the transmission path, and instructs the next-hop terminal device of the transmission policies of the next-hop terminal device by the previous-hop terminal device. Accordingly, the DCI received by the first terminal device from the network device should indicate the transmission policy of all terminal devices, specifically, the DCI includes one or more of the following information: the method comprises the steps of first routing information, transmission mode indication, time domain resource indication of each hop of terminal device in a transmission path, frequency domain resource indication of each hop of terminal device, modulation coding strategy MCS of each hop of terminal device, transmission power control command TPC command of each hop of terminal device or new data indicator of each hop of terminal device or redundancy version of each hop of terminal device, wherein the transmission mode indication is used for indicating the transmission mode, and the first routing information is used for indicating identification of each hop of terminal devices in the transmission path.

In this way, the first terminal apparatus can transmit data to the second terminal apparatus in accordance with one or more of the configured resources, MCS, and the like. Subsequently, the first terminal device can also configure a transmission policy for the second terminal device.

In configuration mode 1, after the first terminal apparatus acquires the transmission policies of all the terminals on the transmission path from the network apparatus, the following steps may be further performed to configure the transmission policies of the second terminal apparatus: the first terminal device transmits side-uplink control information SCI to the second terminal device, the SCI including one or more of the following information: second routing information indicating an identity of a third terminal device in the transmission path, a transmission mode indication of the first terminal device, a time domain resource indication of the second terminal device and each hop of the terminal device after the second terminal device, a frequency domain resource indication of the second terminal device and each hop of the terminal device after the second terminal device, an MCS of the second terminal device and each hop of the terminal device after the second terminal device, a TPC command of the second terminal device and each hop of the terminal device after the second terminal device, a new data indicator of the second terminal device and each hop of the terminal device after the second terminal device, or a redundancy version of the second terminal device and each hop of the terminal device after the second terminal device.

In this way, the second terminal apparatus can transmit data to the next hop terminal apparatus in accordance with the transmission policy notified by the first terminal apparatus. The transmission policy of the next hop terminal device can be notified to the next hop terminal device.

Similarly, the idle resources of the terminal device can be effectively utilized to notify the next hop terminal device of the transmission policy. The resource utilization rate of the terminal device is improved, and the signaling overhead of the network device for notifying all the terminal devices of the transmission strategy is reduced.

In configuration mode 2, the network device notifies all terminals on the transmission path of the respective transmission policies, and the network device notifies the first terminal device of the transmission policy, for example, the first terminal device receives DCI from the network device including one or more of the following information: the identification of the second terminal device (i.e., the next hop terminal device of the first terminal device), the identification of the source sender, the transmission mode indication, the time domain resource indication of the first terminal device, the frequency domain resource indication of the first terminal device, the MCS of the first terminal device, the TPC command of the first terminal device, the new data indicator of the terminal, or the redundancy version of the first terminal device.

In a second aspect, an embodiment of the present application provides a data transmission method, where the method may be performed by a network device, where the network device may be a network device, or may be a device capable of supporting the network device to implement a function of the network device, and may be used in a matching manner with the network device, for example, may be a device in the network device (such as a chip system in the network device). The method comprises the following steps:

the network device determining indication information, the indication information being used for indicating a transmission mode of the first terminal device, the transmission mode including one or more of a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode or a cooperative transmission mode; the network device transmits the instruction information to the first terminal device.

In one possible design, the network device determines the indication information, including: the network device acquires one or more channel state information CS I; and determining the indication information according to the one or more CS I.

In one possible design, the network device sends the indication information to the first terminal device, including:

the network device transmits downlink control information DCI to the first terminal device, where the DCI includes the indication information.

In one possible design, the network device notifies the first terminal device (i.e., the first-hop terminal device) of the transmission policies of all terminal devices on the transmission path, and then indicates the transmission policies of the next-hop terminal device to the next-hop terminal device by the previous-hop terminal device. Accordingly, the DCI transmitted by the network device to the first (hop) terminal device should indicate a transmission policy of all terminals on the transmission path, and specifically, the DCI includes one or more of the following information: the method comprises the steps of first routing information, transmission mode indication, time domain resource indication of each hop of terminal device in a transmission path, frequency domain resource indication of each hop of terminal device, modulation coding strategy MCS of each hop of terminal device, transmission power control command TPC command of each hop of terminal device, new data indicator of each hop of terminal device or redundancy version of each hop of terminal, wherein the transmission mode indication is used for indicating the transmission mode, and the first routing information is used for indicating identification of each hop of terminal devices in the transmission path.

In one possible design, the network device notifies all terminals on the transmission path of the respective transmission policy, and the network device notifies the first terminal device of the transmission policy of the first terminal device, for example, the DCI transmitted by the network device to the first terminal device includes one or more of the following information: the second terminal device identifier, the source sender identifier, the transmission mode indicator, the time domain resource indicator of the first terminal device, the frequency domain resource indicator of the first terminal device, the MCS of the first terminal device, the TPC command of the first terminal device, the new data indicator of the terminal or the redundancy version of the first terminal device. That is, for each terminal device on the transmission path, the network device notifies the terminal device of the transmission policy of the terminal device itself to instruct the terminal device to transmit data to the next-hop terminal device according to the configuration.

In a third aspect, an embodiment of the present application provides a data transmission device, which may be the first terminal device described above. The device comprises: a receiver configured to receive indication information for indicating a transmission mode of the first terminal apparatus, the transmission mode including one or more of a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode, or a cooperative transmission mode; and the transmitter is used for transmitting data according to the transmission mode configured by the indication information.

In one possible design, the receiver is configured to receive indication information, and includes: for receiving downlink control information, DCI, from a network device, the DCI comprising the indication information.

In one possible design, the DCI includes one or more of the following information: the method comprises the steps of first routing information, transmission mode indication, time domain resource indication of each hop of terminal device in a transmission path, frequency domain resource indication of each hop of terminal device, modulation coding strategy MCS of each hop of terminal device, transmission power control command TPC command of each hop of terminal device or new data indicator of each hop of terminal device or redundancy version of each hop of terminal device, wherein the transmission mode indication is used for indicating the transmission mode, and the first routing information is used for indicating identification of each hop of terminal devices in the transmission path.

In one possible design, the transmitter is further configured to transmit side uplink control information SCI to the second terminal device, where the SCI includes one or more of the following information: second routing information indicating an identity of a third terminal device in the transmission path, a transmission mode indication of the first terminal device, a time domain resource indication of the second terminal device and each hop of the terminal device after the second terminal device, a frequency domain resource indication of the second terminal device and each hop of the terminal device after the second terminal device, an MCS of the second terminal device and each hop of the terminal device after the second terminal device, a TPC command of the second terminal device and each hop of the terminal device after the second terminal device, a new data indicator of the second terminal device and each hop of the terminal device after the second terminal device, or a redundancy version of the second terminal device and each hop of the terminal device after the second terminal device.

In one possible design, the DCI includes one or more of the following information: the second terminal device identifier, the source sender identifier, the transmission mode indicator, the time domain resource indicator of the first terminal device, the frequency domain resource indicator of the first terminal device, the MCS of the first terminal device, the TPC command of the first terminal device, the new data indicator of the terminal or the redundancy version of the first terminal device.

In a fourth aspect, an embodiment of the present application provides a data transmission device, which may be the network device of the second aspect. The device comprises: a processor configured to determine indication information for indicating a transmission mode of the first terminal apparatus, the transmission mode including one or more of a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode, or a cooperative transmission mode; and a transmitter for transmitting the instruction information to the first terminal device.

In one possible design, the processor is configured to determine the indication information, including: for obtaining one or more channel state information CS I; and determining the indication information according to the one or more CS I.

In one possible design, the transmitter is configured to transmit the indication information to the first terminal device, and includes: and the downlink control information DCI is used for sending downlink control information DCI to the first terminal device, and the DCI comprises the indication information.

In one possible design, the DCI includes one or more of the following information: the method comprises the steps of first routing information, transmission mode indication, time domain resource indication of each hop of terminal device in a transmission path, frequency domain resource indication of each hop of terminal device, modulation coding strategy MCS of each hop of terminal device, transmission power control command TPC command of each hop of terminal device, new data indicator of each hop of terminal device or redundancy version of each hop of terminal, wherein the transmission mode indication is used for indicating the transmission mode, and the first routing information is used for indicating identification of each hop of terminal devices in the transmission path.

In a fifth aspect, the present application provides a data transmission device having a function of implementing the data transmission method of any one of the first or second aspects. The functions can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In a sixth aspect, there is provided a data transmission apparatus comprising: a processor and a memory; the memory is configured to store computer-executable instructions that, when executed by the data transmission apparatus, cause the data transmission apparatus to perform the data transmission method according to any one of the first or second aspects.

In a seventh aspect, there is provided a data transmission apparatus comprising: a processor; the processor is configured to perform the data transmission method according to any one of the first aspect or the second aspect described above according to the instructions after being coupled to the memory and reading the instructions in the memory.

In an eighth aspect, there is provided a computer readable storage medium having instructions stored therein which, when run on a computer, cause the computer to perform the data transmission method of any one of the first or second aspects above.

In a ninth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the data transmission method of any of the first or second aspects described above.

In a tenth aspect, there is provided circuitry comprising processing circuitry configured to perform the data transmission method of any of the first or second aspects as described above.

In an eleventh aspect, there is provided a chip comprising a processor, the processor being coupled to a memory, the memory storing program instructions which, when executed by the processor, implement the data transmission method of any one of the first or second aspects described above.

A twelfth aspect provides a data transmission system comprising the first terminal device and the network device of the above aspects.

The technical effects of any one of the second to twelfth aspects may be referred to the technical effects of the different designs in the first aspect, and will not be described herein.

Drawings

Fig. 1 is a schematic architecture diagram of a V2X system according to an embodiment of the present application;

FIG. 2 is a schematic diagram of two scheduling modes provided in an embodiment of the present application;

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

fig. 4 to fig. 6 are schematic flow diagrams of a data transmission method according to an embodiment of the present application;

fig. 7 is an exemplary schematic diagram of an application scenario provided in an embodiment of the present application;

fig. 8 to fig. 9 are schematic structural diagrams of a data transmission device according to an embodiment of the present application.

Detailed Description

First, technical terms designed in the embodiments of the present application will be described:

two resource allocation modes of SL:

1. mode 3 (mode 3) in LTE: referring to fig. 2 (a), V2X communication in the case of network coverage is mainly applied. And the base station allocates resources according to the buffer status (buffer status report, BSR) reported by the terminal. And the terminal performs V2X communication on the scheduled time-frequency resource according to the scheduling grant of the base station. Wherein, the scheduling request and the scheduling grant use the uplink and the downlink between the base station and the terminal, and the direct communication between the terminals uses SL. Of course, pattern X is just one naming of V2X communication scheduled for a network device, which may also be called other names. For example, in NR, V2X communication scheduled by a network device is referred to as mode 1 (mode 1) communication.

2. Mode 4 (mode 4) in LTE: referring to fig. 2 (b), the terminal selects a time-frequency resource from a preconfigured V2X resource pool and performs V2X communication on the selected time-frequency resource. Of course, mode X is just one naming of V2X communication for terminal to select V2X transmission resources autonomously, which may also be called other names. For example, in NR, V2X communication in which a terminal selects V2X transmission resources by itself is called mode 2 (mode 2) communication.

Channel state information (channel state information, CSI): in the field of wireless communications, CSI generally refers to the channel properties of a communication link. It describes the attenuation factors of the signal on each transmission path, such as signal scattering (scattering), environmental attenuation (multipath fading or shadowing fading), distance attenuation (power decay of distance), etc.

The data transmission method provided by the embodiment of the application is mainly applied to a scene with network coverage. Referring to fig. 3, a communication system according to an embodiment of the present application includes a terminal device and a network device. Wherein the terminal device can be connected to the network device through an air interface so as to receive the network service. The network device is mainly used for realizing the functions of a wireless physical layer, resource scheduling, wireless resource management, wireless access control and mobility management.

The terminal devices may also communicate directly with each other through SL, for example, V2X communication. It is to be understood that the resource pool used by SL direct communication may be a resource pool configured by the network device, for example, a resource pool used when the terminal device is connected to the air interface of the network device normally, or may be a resource pool preconfigured in the terminal device, for example, a resource pool configured in the terminal device in advance according to a protocol rule by a manufacturer of the equipment before the terminal device leaves the factory.

The above-mentioned terminal devices may be, for example, direct communication via SL, V2V, V2I, V2N, V2P communication mentioned above, or other forms of direct communication between terminal devices, such as pedestrian-to-pedestrian (pedestrian to pedestrian, P2P) communication.

In addition, besides SL, the direct communication between the terminal apparatuses may also use other forms or other names of wireless connection, such as future wireless communication systems, 6G systems, and the like, which is not limited in this application.

The network device may refer to a network device having a wireless transceiver function, or may refer to a component (such as a chip system) provided in the network device, or other forms. The network device includes, but is not limited to: an Access Point (AP) in a Wi-Fi system, such as a home wireless router, a wireless relay node, a wireless backhaul node, a transmission point (transmission and reception point, TRP or transmission point, TP), an eNB, a wireless network controller (radio network controller, RNC), a Node B (NB), a base station controller (base station controller, BSC), a base transceiver station (base transceiver station, BTS), a home base station (e.g., home evolved nodeB, or home node B, HNB), a baseband unit (BBU), a 5G system, such as a gNB in NR, or a transmission point (TRP or TP), one or a group (including multiple antenna panels) of antenna panels of a base station in a 5G system, or a network node constituting a gNB or transmission point, such as a baseband unit (BBU), or a Distributed Unit (DU), etc.

In some deployments, the gNB may include Centralized Units (CUs) and Distributed Units (DUs). The gNB may also include a Radio Unit (RU). The CU implements part of the functionality of the gNB and the DU implements part of the functionality of the gNB. For example, a CU implements functions of a radio resource control (radio resource control, RRC), a packet data convergence layer protocol (packet data convergence protocol, PDCP) layer and a service discovery application specification (service discovery application profile, SDAP) layer, and a DU implements functions of a radio link control (radio link control, RLC), a medium access control (media access control, MAC) and a Physical (PHY) layer. Since the information of the RRC layer may be eventually changed into the information of the PHY layer or converted from the information of the PHY layer, under this architecture, higher layer signaling, such as RRC layer signaling or PHCP layer signaling, may also be considered as being transmitted by the DU or by the du+ru. It is understood that the network apparatus may be a CU node, or a DU node, or a device including a CU node and a DU node. In addition, a CU may be divided into network devices in an access network (radio access network, RAN), or may be divided into network devices in a Core Network (CN), which is not limited herein.

The terminal device may be a user equipment having a wireless transceiving function or a component (such as a chip system) provided in the user equipment. The terminal device may also be referred to as a Station (STA), a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user device, for example. The above terminal device includes, but is not limited to: a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned driving (self driving), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a terminal in the internet of vehicles (such as an automobile terminal), a sensor-like device such as a monitoring terminal, and the like.

It should be understood that fig. 3 is a simplified schematic diagram illustrating only terminal devices and network devices (such as base stations) for ease of understanding. In the embodiment of the present application, the wireless communication system may further include other network devices or may further include other terminal devices, which are not shown in fig. 3.

The terms "first" and "second" and the like in the description and in the drawings are used for distinguishing between different objects or for distinguishing between different processes of the same object and not for describing a particular sequential order of objects. Furthermore, references to the terms "comprising" and "having" and any variations thereof in the description of the present application are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed but may optionally include other steps or elements not listed or inherent to such process, method, article, or apparatus. It should be noted that, in the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion. The term "plurality" as referred to in the embodiments of the present application generally refers to two or more. This is described herein in detail.

The data transmission method provided in the embodiment of the present application is described below with reference to the communication system shown in fig. 3.

Referring to fig. 4, a description will be given below of a data transmission method according to an embodiment of the present application, taking a first terminal device as an example of a data sender, where the data transmission method provided by the embodiment of the present application includes the following steps:

s401, the first terminal apparatus transmits a scheduling request to the network apparatus.

Accordingly, the network device receives a scheduling request from the first terminal.

Wherein the scheduling request includes an identification of the first terminal device, an identification of the destination terminal device, a traffic type of the first terminal device, quality of service (quality of service, qoS) information of the first terminal device, and a buffer status report (buffer status report, BSR). The identity of the terminal device may be, but is not limited to, an international mobile subscriber identity (international mobile subscriber identification number, IMSI), a cell radio network temporary identity (cell radio network temporary identifier, C-RNTI) or the like of the terminal. The QoS information may be used to indicate one or more of bandwidth, delay jitter, packet loss rate, etc. of the first terminal apparatus.

The scheduling request is for the first terminal device to acquire a transmission mode. Optionally, the scheduling request is also used for the first terminal device to request available resources. In this way, the first terminal device communicates on the available resources.

As a possible implementation, when the first terminal device has a data transmission requirement, the first terminal device sends a scheduling request to the network device through uplink control information (uplink control information, UCI). Alternatively, the first terminal device transmits a scheduling request to the network device through a control unit (media access control control element, mac CE) of the medium access control layer.

S402, the network device determines the instruction information.

The indication information is used for indicating a transmission mode of the first terminal device, and the transmission mode comprises one or more transmission modes of a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode or a cooperative transmission mode. Optionally, the indication information is further used to indicate a transmission path (may also be referred to as a communication path) of the first terminal device.

As one possible design, S402 may be embodied as: the network device acquires one or more CSI, and determines the indication information according to the one or more CSI and the scheduling request. Wherein, the CSI may be represented in the following matrix format:

in general, when i and j are not equal, CSI _ij Representing CSI for the communication link between terminal i and terminal j. When i is equal to j, CSI _ij Does not have practical physical significance. The CSI includes information such as channel quality indication (channel quality indication, CQI), rank Indication (RI), and precoding matrix indication (precoding matrix indicator, PMI).

As a possible implementation, the network device determines the indication information according to the identification of the first terminal device (initial data sender), the identification of the destination terminal device (final data receiver) and one or more CSI. Specifically, the network device determines one or more available communication links according to the identifier of the first terminal device and the identifier of the destination terminal device, and then determines a communication link used for the current communication of the first terminal device from a plurality of communication links based on CSI of one or more communication links and/or service type and/or QoS information of the first terminal device, and determines a transmission mode of the current communication of the first terminal device. That is, after determining a plurality of available communication links, the communication links for communication, and the transmission mode may be determined according to a plurality of CSI and traffic types. The link for communication, and the transmission mode may also be determined according to the plurality of CSI and QoS information of the first terminal apparatus. The link and transmission mode for communication may also be determined according to the plurality of CSI, qoS information of the first terminal apparatus, and the traffic type. The link and transmission mode for communication may also be determined based on only the plurality of CSI.

Optionally, the network device selects a communication link with the weakest signal scattering as the communication link of the first terminal device for the current communication, and/or selects a communication link with the weakest environment as the communication link of the first terminal device for the current communication, and/or selects a communication link with the weakest distance attenuation as the communication link of the first terminal device for the current communication. Of course, it is also possible for the network device to select the communication link for the communication of the first terminal device this time in other ways.

If the network device is covered with L terminals, L is a positive integer. The number of communication links managed by the network device is The formula is a permutation and combination formula. The available communication links mentioned in the embodiments of the present application refer to links that can be used from a source terminal device to a destination terminal device among all communication links managed by a network device. Such as that of fig. 7, the scheduler of the network device is available by some scheduling algorithm, and the link that can be used for the communication between the terminal device a and the terminal device F may be a to C to F link, a direct to F link, or a to C to F link and a to D to F link.

Where communication between a and F uses two links, a-C-F and a-D-F, there may be two transmission modes, where one transmission mode is a cooperative transmission mode, and a cooperative communication mode refers to a mode in which multiple sender terminal devices use the same resource for communication. Taking terminal a, terminal C, terminal D, and terminal F as examples, terminal a firstly broadcasts data to the selected C, D, and then the terminal C, D respectively transmits the received data to terminal F in a cooperative communication (cooperative communication) manner, that is, terminal C and terminal D broadcast source data to terminal F on the same resource, and accordingly, terminal F receives two source data from terminal C, D on the same resource, and the received power of terminal F on the same resource is a superposition of the received powers of the two source data, which means that the received power of terminal F on the same resource is improved compared with the non-cooperative communication. In addition, in cooperative communication, multiple terminals may also use the same modulation and coding strategy (modulation and coding scheme, MCS).

Another transmission mode in the case of using two links, a-C-F and a-D-F, for communication between a and F is a multipath transmission mode, i.e., terminal a sends data to C, D first, and terminal C, D sends data to F in a non-cooperative communication manner, i.e., C, D sends data to F using different resources.

The transmission mode described above for transmitting data between a and F over a link directly to F may be referred to as a single hop transmission mode in embodiments of the present application.

The transmission mode for transmitting data between a and F over the link between a-C-F may be referred to as a single-path multi-hop transmission mode.

The network device may determine indication information (for indicating a transmission mode) based only on the one or more CSI. For example, if the network device determines that, among the 4 communication paths, CSI is better when communication between a and F is implemented through a-C-F, for example, the distance attenuation may be the smallest, the network device determines that communication between a and F is implemented through a-C-F link, and accordingly, the corresponding transmission mode is a multipath transmission mode.

The network device may determine indication information (for indicating a transmission mode) based on the one or more CSI and some other parameters. For example, if the network device determines that, among the 4 communication paths, the CSI is better when the a and the F communicate through the two communication links, i.e. the a-C-F and the a-D-F, for example, the signal scattering is minimal, i.e. the network device passes through the multipath transmission mode, the network device needs to further determine whether the multipath cooperation or the non-cooperation transmission mode is adopted between A, F. Specifically, the network device determines, according to the service type and/or QoS information of the terminal device a, that communication between the terminal devices A, F is required by the multipath cooperative transmission mode. For example, when the terminal apparatus a performs the mail service, since the mail service generally requires high reliability, the data of the terminal apparatus a may be transmitted in the cooperative transmission mode to reduce the probability of low reliability due to attenuation of the signal during transmission.

In some embodiments, the network device may further obtain one or more parameters of power consumption, remaining power, traffic volume, transmission capability, and the like of the first terminal device, and determine the indication information according to CSI and one or more of the one or more parameters. For example, when the power consumption of the first terminal device is large, in order to increase the received power reaching the receiving end without increasing the transmission power of the transmitting end, the data of the first terminal device may be transmitted in the cooperative transmission mode.

S403, the network device transmits instruction information to the first terminal device.

Accordingly, the first terminal device receives the instruction information from the network device.

It will be appreciated that, after determining the transmission mode of the first terminal device, for example, the network device determines that the first terminal device adopts the multi-hop transmission mode, and the multi-hop includes the second terminal device, the third terminal device, and the fourth terminal device in sequence, the network device may send indication information for indicating the transmission mode to the first terminal device, so that the first terminal device transmits data according to the transmission mode configured by the indication information.

In this embodiment of the present application, a transmission policy of each terminal device on a transmission path may be configured, where the transmission policy of a certain terminal device includes a transmission mode of the terminal device, a used time-frequency resource, a modulation coding scheme, and the like, and the transmission policy of the configured terminal device may have the following two implementation manners:

In implementation 1, the network device configures a complete transmission policy for a first hop terminal device (i.e., the first terminal device) in the transmission path, where the complete transmission policy includes transmission policies of all terminal devices in the transmission path, and then the first hop terminal device sends the transmission policy of the second hop terminal device to the second hop terminal device, and so on, where the previous hop terminal device sends the transmission policy of the next hop terminal device to the next hop terminal device. In this way, the next hop terminal device can transmit data to the next hop (next hop) terminal device of the next hop terminal device according to the transmission policy acquired from the previous hop terminal device.

In implementation 1, in S403, the network device sends the instruction information for the first hop terminal device (i.e., the first terminal device described above), referring to fig. 5, specifically may be implemented as follows S4033a: the network device transmits downlink control information (downlink control information, DCI) to the first terminal device, the DCI including a complete transmission policy including indication information for indicating a transmission mode of the first terminal device.

Specifically, the complete transmission policy in DCI includes one or more of the following information: the first routing information, the transmission mode indication, the time domain resource indication of each hop of the terminal device in the transmission path (time resource indication), the frequency domain resource indication of each hop of the terminal device (frequency resource indication), the modulation coding strategy of each hop of the terminal device (modulation and coding scheme, MCS), the transmit power control command TPC command of each hop of the terminal device or the new data indicator of each hop of the terminal device or the redundancy version of each hop of the terminal (redundancy version). The transmission mode indication is used for indicating the transmission mode, the first routing information is used for indicating a transmission path, and optionally, the first routing information is used for indicating the identification of each hop of terminal device in the transmission path, and the first routing information comprises a source sender, a destination receiver and a terminal device used for forwarding data between the source sender and the destination receiver. The time domain resource indication of each hop of the terminal device in the transmission path generally refers to a time domain resource indication of the source sender and the terminal device for forwarding data between the source sender and the destination receiver, that is, the time domain resource of the destination receiver is not required to be indicated. The definition of other parameters may refer to the time domain resource indication and will not be described here again.

For example, referring to fig. 7, if the network device determines that the terminal a transmits data to C, D first, and then C, D transmits data to the terminal F in a cooperative communication manner, the network device issues DCI to the terminal a, where the DCI includes a complete transmission policy, and the complete transmission policy includes one or more of the following information: the first routing information is used to indicate the two transmission paths, for example, the first routing information includes the identifier of the terminal A, C, D, F, and indicates the hops in the two transmission paths where each terminal is located; the transmission mode instructs the first terminal device to transmit data in a cooperative transmission mode; time domain resource indication of terminal device a, for example, occupy time slots 1-3 to transmit data to terminal device C, occupy time slots 4-6 to transmit data to terminal device D, time domain resource indication of terminal device C, for example, occupy time slot 1 to transmit data to terminal device F, time domain resource indication of terminal device D, for example, occupy time slot 1 to transmit data to terminal device F (since terminal C, D adopts cooperative communication scheme, the time domain resources occupied by terminal device D and terminal device C are the same); a frequency domain resource indication of terminal apparatus A, C, D, F, a modulation coding scheme (modulation and coding scheme, MCS) of terminal apparatus A, C, D, F, a transmit power control (transmit power control, TPC) command (command) of terminal apparatus A, C, D, F, a new data indicator (new data indicator) of terminal apparatus A, C, D, F; redundancy versions of the terminal apparatus A, C, D, F.

It should be noted that, the DCI may include a transmission mode indication to explicitly indicate a transmission mode of the first terminal device, that is, the transmission mode indication is used to indicate a transmission mode of the first terminal device, and the indication information includes the transmission mode indication. Of course, the DCI may not include a transmission mode indication, and in this case, other information included in the DCI, such as a time domain, a frequency domain resource indication, an MCS, and the like, may implicitly indicate a transmission mode. For example, if the terminal C, D transmits data to the same terminal apparatus using the same time domain resource, the same frequency domain resource, and the same MCS, the terminal C, D can be implicitly instructed to transmit data using the cooperative communication scheme. I.e. the indication information comprises one or more of information such as time domain, frequency domain resource indication, MCS, etc. Of course, the indication information may also include both a transmission mode indication for implicitly indicating a transmission mode and other information for displaying the indication transmission mode.

For a certain terminal, for example, the terminal C, one or more of the information including the time domain, the frequency domain resource indication of the terminal C, the MCS of the terminal C, the TPC command of the terminal C, the new data indicator or the redundancy version of the terminal C is used to indicate the transmission policy of the terminal C. As in the above-described scheme, the first-hop terminal device (terminal a) can acquire the transmission policy of each-hop terminal device in the transmission path from the network device. In this way, the transmission policy of the next hop terminal device can be configured by the previous hop terminal device to complete the transmission policy configuration of each hop terminal device.

Specifically, the previous hop terminal device configures the transmission policy of the next hop terminal device through the side uplink control information (sidelink control information, SCI). Taking the first terminal device as the next hop terminal device, a transmission policy is configured as an example. Referring to fig. 5, when the first terminal device needs to transmit data, after it acquires a complete transmission policy including indication information from the network device, i.e., after S4033a, since the complete transmission policy includes transmission policies of all terminal devices on a transmission path determined by the network device, the first terminal device may acquire a transmission policy of a next-hop terminal device (i.e., a second terminal device) from the complete transmission policy, and notify the second terminal device of the transmission policy of the second terminal device by performing the following step S4033 b:

s4033b, the first terminal device transmits an SCI for indicating the transmission policy of the second terminal device and for indicating the transmission policy of each hop terminal device after the second terminal device to the second terminal device. Specifically, the SCI includes one or more of the following information: second routing information, transmission mode indication of the first terminal device, time domain resource indication of the second terminal device and per hop terminal device after the second terminal device, frequency domain resource indication of the second terminal device and per hop terminal device after the second terminal device, MCS of the second terminal device and per hop terminal device after the second terminal device, TPC command of the second terminal device and per hop terminal device after the second terminal device, new data indicator of the second terminal device and per hop terminal device after the second terminal device, or redundancy version of the second terminal device and per hop terminal device after the second terminal device. The second routing information is used for indicating the identification of a third terminal device in the transmission path, namely the identification of a next hop terminal device after the second terminal device. Wherein each hop of the terminal device after the second terminal device does not include the destination terminal device. That is, the destination terminal device is the final data receiving side, and the transmission policy of the destination terminal device need not be instructed. In this way, the second terminal device may transmit data from the first terminal device to the next hop terminal device according to its configured transmission policy, i.e., one or more of the time domain resource indication, the frequency domain resource indication, the MCS, the TPC command, the new data indicator, the redundancy version, etc. of the second terminal device.

Similarly, still referring to fig. 5, the second terminal device receives the SCI from the first terminal device, from which the second terminal device may obtain the transmission policy of the third terminal device and the transmission policy of the terminal (if present) device after the third terminal device. After that, the second terminal apparatus continues to perform S4033c, i.e., transmits an SCI for instructing the third terminal apparatus to transmit a policy.

Similarly, the third terminal apparatus may also perform S4033d, i.e., transmit an SCI for indicating the transmission policy of the fourth terminal apparatus to the fourth terminal apparatus.

Illustratively, taking terminal a sends data to terminal H through terminal C, F as an example, after a obtains a complete transmission policy (including a transmission policy between a terminal to terminal C and terminal C to terminal F, F to H), terminal a sends SCI to terminal C, where SCI indicates the identity of the next hop terminal device of terminal C, that is, the identity of terminal device F, so that, after receiving data from terminal a, terminal C can send data from terminal a to terminal F. The SCI may further indicate a transmission mode of the first terminal apparatus, and may further indicate one or more of a time domain occupied by the terminal C transmitting data to the terminal F, a frequency domain resource, an MCS of the terminal C, a TPC command of the terminal C, a new data indicator of the terminal C, and a redundancy version of the terminal C. In this way, terminal C can transmit data to terminal F according to the transmission policy. Similarly, terminal C sends SCI to terminal F for indicating that the next hop terminal device of terminal F is H, and indicates one or more of time domain, frequency domain resources occupied by terminal F sending data to terminal H, MCS of terminal F, TPC command of terminal F, new data indicator of terminal F, redundancy version of terminal F, or other information. It can be seen that, except for the first hop terminal device, the other terminal devices acquire the complete transmission policy, and all the other terminal devices acquire the local transmission policy (i.e. their own transmission policy) from the last hop terminal device. In this way, the transmission mode of the first terminal device transmitting data to the destination terminal device can be expanded, and the first terminal device is not limited to directly transmitting data to the destination terminal device.

When the data is transmitted in the multipath transmission mode, for example, if the terminal a transmits the data to the terminal C, D first, then the terminal C, D transmits the data to the terminal F, and the terminal a may transmit the data to the terminal C, D through unicast or multicast. The embodiment of the application does not limit the specific way of sending data by the terminal a.

In implementation 2, the transmission policy of the terminal device is configured, and the network device may also configure a local transmission policy for each hop of the terminal device in the transmission path, that is, the transmission policies of all the terminal devices are configured by the network device. For example, a network device configures only the transmission policy of a terminal device for the terminal device, and not configures the complete transmission policy for the terminal device. Specifically, for each hop of the terminal device in the transmission path, the network device transmits DCI to the terminal device to configure the transmission policy of the terminal device. Taking the example of configuring the transmission policy of the first terminal device by the network device, referring to fig. 6, S403 may be embodied as S4033e: the network device transmits Downlink Control Information (DCI) to the first terminal device, the DCI including one or more of: the identification of the second terminal device (i.e., the next hop terminal device of the first terminal device), the identification of the source sender (i.e., the first terminal device), the transmission mode indication of the first terminal device, the time domain resource indication of the first terminal device, the frequency domain resource indication of the first terminal device, the MCS of the first terminal device, the TPC command of the first terminal device, the new data indicator of the first terminal device, or the redundancy version of the first terminal device. In this embodiment, for a certain terminal device in the transmission path, the terminal device may acquire a local transmission policy from the network device, that is, the transmission policy of the terminal device itself.

Similarly, the network device may configure local transmission policies of other terminal devices in the transmission path. For example, the network device performs S4033f, i.e. transmits DCI to the second terminal device, including, but not limited to, an identification of a source sender (i.e. the first terminal device), an identification of a next hop terminal device of the second terminal device, a time domain, frequency domain resource indication of the second terminal device, an MCS of the second terminal device, the DCI being used to indicate a transmission policy of the second terminal device.

The network device performs S4033g, i.e., transmits DCI for instructing the third terminal device to transmit the transmission policy.

The network device performs S4033h, i.e., transmits DCI for indicating a transmission policy of the fourth terminal device to the fourth terminal device.

The embodiment of the present application does not limit the execution order of S4033f to S4033 h. That is, the network device may transmit DCI to the second terminal device, and then sequentially transmit DCI to the third and fourth terminal devices, or may simultaneously transmit DCI to the second terminal device, the third terminal device, and the fourth terminal device.

S404, the first terminal device transmits data according to the transmission mode configured by the indication information.

For example, referring to fig. 5 or 6, according to the above-described transmission policy, the first terminal device transmits data to the second terminal device according to the above-described configuration for the first terminal device. Subsequently, the second terminal device transmits the data to the third terminal device, and the third terminal device transmits the data to the fourth terminal device, so that the first terminal device transmits the data to the fourth terminal device.

In the technical solution corresponding to fig. 5, the timing of transmitting SCI from the previous hop terminal device to the next hop terminal device may be the same timing or different from the timing of transmitting data from the previous hop terminal device to the next hop terminal device. For example, the first terminal device may transmit the SCI to the second terminal device first and then transmit the side uplink data information to the second terminal device, and for example, the first terminal device may transmit the SCI to the second terminal device and simultaneously transmit the side uplink data information to the second terminal device. The embodiment of the present application does not limit the execution order of the terminal device to transmit SCI and transmitting side uplink data information.

According to the data transmission method provided by the embodiment of the application, the first terminal device receives the indication information and transmits data according to the transmission mode configured by the indication information. Wherein the transmission mode includes one or more of a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode, or a cooperative transmission mode. In this way, the first terminal apparatus can perform data transmission in the multipath transmission mode, or the multi-hop transmission mode, or the single-hop transmission mode or the cooperative transmission mode. The data transmission modes of the terminal device are enriched, so that the terminal device is not limited to direct communication, namely, the data transmission from the sender to the receiver directly.

The above description has been presented mainly from the point of interaction between different network elements. It will be appreciated that the network device and the terminal apparatus, in order to implement the above-described functions, comprise corresponding hardware structures and/or software modules that perform the respective functions. The various example units and algorithm steps described in connection with the embodiments disclosed herein may be embodied as hardware or a combination of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Those skilled in the art may implement the described functionality using different approaches for each particular application, but such implementation is not to be considered as beyond the scope of the embodiments of the present application.

The embodiment of the present application may divide functional units of the network device, the terminal device, and the like according to the above method example, for example, each functional unit may be divided corresponding to each function, or two or more functions may be integrated in one processing unit. The integrated units may be implemented in hardware or in software functional units. It should be noted that, in the embodiment of the present application, the division of the units is schematic, which is merely a logic function division, and other division manners may be implemented in actual practice.

Fig. 8 shows a possible exemplary block diagram of a data transmission device according to an embodiment of the present application, which device 800 may be in the form of software, a device or a chip that may be used for the device. The apparatus 800 includes: a processing unit 802 and a communication unit 803.

The processing unit 802 is used for controlling and managing the actions of the apparatus 800. If the device is a network device as described above, the processing unit 802 is configured to support the device 800 to perform S402 in fig. 4, and/or other processes for the techniques described herein. If the device is the first terminal device, the processing unit 802 is configured to support the device 800 to control the communication unit 803 to transmit and receive information, and/or other processes for the techniques described herein.

The communication unit 803 is used to support communication of the apparatus 800 with other network entities, such as terminals. If the device is the network device described above, the communication unit 803 is configured to support the device 800 to perform S401, S403 in fig. 4, S4033a in fig. 5, S4033 e-S4033 h in fig. 6, and/or other processes for the techniques described herein. If the device is the first terminal device described above, the communication unit 803 is configured to support the device 800 to perform S401, S403, S404 in fig. 4, S4033b in fig. 5, and/or other processes for the techniques described herein.

The apparatus 800 may further comprise a storage unit 801 for storing program code and data of the apparatus 800.

The processing unit 802 may be a processor or controller, such as a CPU, general-purpose processor, DSP, ASIC, FPGA, or other programmable logic device, transistor logic device, hardware component, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules, and circuits described in connection with this disclosure. The processor may also be a combination that performs the function of a computation, e.g., a combination comprising one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The communication unit 803 may be a communication interface, a transceiver, a transceiving circuit, or the like, where the communication interface is generally called, and in a specific implementation, the communication interface may include a plurality of interfaces, for example, may include: an interface between a base station and a terminal, and/or other interfaces. The storage unit 801 may be a memory.

When the processing unit 802 is a processor, the communication unit 803 is a transceiver, and the storage unit 801 is a memory, the apparatus 800 according to the embodiment of the present application may be an apparatus shown in fig. 9.

Referring to fig. 9, the apparatus 900 includes: a processor 902, a transceiver 903, a memory 901. Optionally, the apparatus 900 may also include a bus 904. Wherein the transceiver 903, the processor 902 and the memory 901 may be interconnected by a bus 904; the bus 904 may be a peripheral component interconnect standard (Peripheral Component Interconnect, PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, among others. The bus 904 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in fig. 9, but not only one bus or one type of bus.

Alternatively, the transceiver may be a separately provided transmitter that may be used to transmit information to other devices, or a separately provided receiver that may be used to receive information from other devices. The transceiver may also be a component that integrates the functions of transmitting and receiving information, and the embodiments of the present application do not limit the specific implementation of the transceiver.

Of course, the data transmission device according to the embodiment of the present application is not limited to the above-described configuration shown in fig. 8 and 9. More or fewer devices may be included or a different arrangement of components than in fig. 8 and 9.

Those of ordinary skill in the art will appreciate that: in the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more servers, data centers, etc. that can be integrated with the available medium. The usable medium may be a magnetic medium (e.g., a floppy Disk, a hard Disk, a magnetic tape), an optical medium (e.g., a digital video disc (Digital Video Disc, DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, or may be in electrical or other forms.

The units described as separate units may or may not be physically separate, and units displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network devices (for example, terminals). Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, each functional unit may exist independently, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.

From the above description of the embodiments, it will be clear to those skilled in the art that the present application may be implemented by means of software plus necessary general purpose hardware, or of course by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a readable storage medium, such as a floppy disk, a hard disk, or an optical disk of a computer, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the method described in the embodiments of the present application.

The foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and the changes or substitutions within the technical scope of the present disclosure should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A data transmission method, comprising:

the method comprises the steps that a first terminal device receives indication information, wherein the indication information is used for indicating a transmission mode of the first terminal device, and the transmission mode comprises one or more transmission modes of a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode or a cooperative transmission mode; the indication information is determined by at least one of the identification of the first terminal device, one or more Channel State Information (CSI) and the identification of the destination terminal device; the destination terminal device is a terminal device for receiving the data;

The first terminal device transmits data according to the transmission mode configured by the indication information; the configured transmission mode comprises a transmission strategy of the first terminal device in a configuration transmission path, and the transmission strategy of the first terminal device comprises at least one of a transmission mode of the first terminal device, a used time-frequency resource and a modulation coding mode.

2. The data transmission method according to claim 1, wherein the first terminal device receives the instruction information, comprising:

3. The data transmission method of claim 2, wherein the DCI includes one or more of the following information: the method comprises the steps of first routing information, transmission mode indication, time domain resource indication of each hop of terminal device in a transmission path, frequency domain resource indication of each hop of terminal device, modulation coding strategy MCS of each hop of terminal device, transmission power control command TPC command of each hop of terminal device or new data indicator of each hop of terminal device or redundancy version of each hop of terminal device, wherein the transmission mode indication is used for indicating the transmission mode, and the first routing information is used for indicating identification of each hop of terminal devices in the transmission path.

4. A data transmission method according to claim 3, characterized in that the method further comprises: the first terminal device transmits side-uplink control information SCI to the second terminal device, the SCI including one or more of the following information: second routing information indicating an identity of a third terminal device in the transmission path, a transmission mode indication of the first terminal device, a time domain resource indication of the second terminal device and each hop of the terminal device after the second terminal device, a frequency domain resource indication of the second terminal device and each hop of the terminal device after the second terminal device, an MCS of the second terminal device and each hop of the terminal device after the second terminal device, a TPC command of the second terminal device and each hop of the terminal device after the second terminal device, a new data indicator of the second terminal device and each hop of the terminal device after the second terminal device, or a redundancy version of the second terminal device and each hop of the terminal device after the second terminal device.

5. The data transmission method of claim 2, wherein the DCI includes one or more of the following information: an identification of a second terminal device, an identification of a source sender, a transmission mode indication, a time domain resource indication of the first terminal device, a frequency domain resource indication of the first terminal device, an MCS of the first terminal device, a TPC command of the first terminal device, a new data indicator of the terminal or a redundancy version of the first terminal device.

6. A data transmission method, comprising:

the network device determining indication information, the indication information being used for indicating a transmission mode of the first terminal device, the transmission mode including one or more of a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode or a cooperative transmission mode; the indication information is determined by at least one of the identification of the first terminal device, one or more Channel State Information (CSI) and the identification of the destination terminal device; the destination terminal device is a terminal device for receiving the data;

the network device transmits the instruction information to the first terminal device.

7. The data transmission method according to claim 6, wherein the network device determines the indication information, comprising:

the network device acquires one or more pieces of Channel State Information (CSI);

the network device determines the indication information from the one or more CSI.

8. The data transmission method according to claim 6 or 7, wherein the network device transmitting the instruction information to the first terminal device includes:

9. The data transmission method of claim 8, wherein the DCI includes one or more of the following information: the method comprises the steps of first routing information, transmission mode indication, time domain resource indication of each hop of terminal device in a transmission path, frequency domain resource indication of each hop of terminal device, modulation coding strategy MCS of each hop of terminal device, transmission power control command TPC command of each hop of terminal device, new data indicator of each hop of terminal device or redundancy version of each hop of terminal, wherein the transmission mode indication is used for indicating the transmission mode, and the first routing information is used for indicating identification of each hop of terminal devices in the transmission path.

10. The data transmission method of claim 8, wherein the DCI includes one or more of the following information: an identification of a second terminal device, an identification of a source sender, a transmission mode indication, a time domain resource indication of the first terminal device, a frequency domain resource indication of the first terminal device, an MCS of the first terminal device, a TPC command of the first terminal device, a new data indicator of the terminal or a redundancy version of the first terminal device.

11. A data transmission apparatus, comprising:

a receiver configured to receive indication information for indicating a transmission mode of a first terminal apparatus, the transmission mode including one or more of a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode, or a cooperative transmission mode; the indication information is determined by at least one of the identification of the first terminal device, one or more Channel State Information (CSI) and the identification of the destination terminal device; the destination terminal device is a terminal device for receiving the data;

a transmitter for transmitting data according to the transmission mode configured by the indication information; the configured transmission mode comprises a transmission strategy of the first terminal device in a configuration transmission path, and the transmission strategy of the first terminal device comprises at least one of a transmission mode of the first terminal device, a used time-frequency resource and a modulation coding mode.

12. The data transmission apparatus according to claim 11, wherein the receiver for receiving the indication information comprises: for receiving downlink control information, DCI, from a network device, the DCI comprising the indication information.

13. The data transmission apparatus of claim 12, wherein the DCI includes one or more of the following information: the method comprises the steps of first routing information, transmission mode indication, time domain resource indication of each hop of terminal device in a transmission path, frequency domain resource indication of each hop of terminal device, modulation coding strategy MCS of each hop of terminal device, transmission power control command TPC command of each hop of terminal device or new data indicator of each hop of terminal device or redundancy version of each hop of terminal device, wherein the transmission mode indication is used for indicating the transmission mode, and the first routing information is used for indicating identification of each hop of terminal devices in the transmission path.

14. The data transmission device according to any of claims 11 to 13, characterized in that the transmitter is further configured to transmit side-uplink control information SCI to the second terminal device, the SCI comprising one or more of the following information: second routing information indicating an identity of a third terminal device in a transmission path, a transmission mode indication of the first terminal device, a time domain resource indication of the second terminal device and each hop of the terminal device after the second terminal device, a frequency domain resource indication of the second terminal device and each hop of the terminal device after the second terminal device, an MCS of the second terminal device and each hop of the terminal device after the second terminal device, a TPC command of the second terminal device and each hop of the terminal device after the second terminal device, a new data indicator of the second terminal device and each hop of the terminal device after the second terminal device, or a redundancy version of the second terminal device and each hop of the terminal device after the second terminal device.

15. The data transmission apparatus of claim 12, wherein the DCI includes one or more of the following information: an identification of a second terminal device, an identification of a source sender, a transmission mode indication, a time domain resource indication of the first terminal device, a frequency domain resource indication of the first terminal device, an MCS of the first terminal device, a TPC command of the first terminal device, a new data indicator of the terminal or a redundancy version of the first terminal device.

16. A data transmission apparatus, comprising:

a processor configured to determine indication information for indicating a transmission mode of the first terminal apparatus, the transmission mode including one or more of a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode, or a cooperative transmission mode; the indication information is determined by at least one of the identification of the first terminal device, one or more Channel State Information (CSI) and the identification of the destination terminal device; the destination terminal device is a terminal device for receiving the data;

and a transmitter for transmitting the instruction information to the first terminal device.

17. The data transmission apparatus of claim 16, wherein the processor configured to determine the indication information comprises: for obtaining one or more channel state information, CSI; and determining the indication information according to the one or more CSI.

18. The data transmission apparatus according to claim 16 or 17, wherein the transmitter for transmitting the indication information to the first terminal apparatus includes: and the downlink control information DCI is used for sending downlink control information DCI to the first terminal device, and the DCI comprises the indication information.

19. The data transmission apparatus of claim 18, wherein the DCI includes one or more of the following information: the method comprises the steps of first routing information, transmission mode indication, time domain resource indication of each hop of terminal device in a transmission path, frequency domain resource indication of each hop of terminal device, modulation coding strategy MCS of each hop of terminal device, transmission power control command TPC command of each hop of terminal device, new data indicator of each hop of terminal device or redundancy version of each hop of terminal, wherein the transmission mode indication is used for indicating the transmission mode, and the first routing information is used for indicating identification of each hop of terminal devices in the transmission path.

20. The data transmission apparatus of claim 18, wherein the DCI includes one or more of the following information: an identification of a second terminal device, an identification of a source sender, a transmission mode indication, a time domain resource indication of the first terminal device, a frequency domain resource indication of the first terminal device, an MCS of the first terminal device, a TPC command of the first terminal device, a new data indicator of the terminal or a redundancy version of the first terminal device.

21. A first terminal device comprising one or more processors and one or more memories; the one or more memories are coupled with the one or more processors, the one or more memories for storing computer program code or computer instructions;

the computer program code or computer instructions, when executed by the one or more processors, cause the first terminal device to perform the data transmission method of any of claims 1-5.

22. A network device comprising one or more processors and one or more memories; the one or more memories are coupled with the one or more processors, the one or more memories for storing computer program code or computer instructions;

The computer program code or computer instructions, when executed by the one or more processors, cause the network device to perform the data transmission method of any of claims 6-10.

23. A computer readable storage medium storing computer instructions or a program which, when run on a computer, cause the computer to perform the data transmission method according to any one of claims 1-5.

24. A computer readable storage medium, characterized in that the computer readable storage medium stores computer instructions or a program which, when run on a computer, causes the computer to perform the data transmission method according to any one of claims 6-10.