CN112423393B - Data transmission method and device - Google Patents

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

Background technique

With the development of wireless communication technology, people's demand for understanding and communicating with people or things around them has gradually increased. Therefore, device to device (D2D) technology has emerged. D2D technology allows multiple devices that support D2D functions to directly discover and communicate with each other. However, the Internet of Vehicles requires extremely high security and high latency. Currently, D2D technology cannot achieve low latency, so it cannot meet the needs of the Internet of Vehicles.

In order to improve the security of the Internet of Vehicles, the vehicle-to-everything (V2X) Internet of Vehicles technology was proposed in the network based on the long term evolution (LTE) technology proposed by the 3rd generation partnership project (3GPP). V2X communication refers to the communication between vehicles and anything in the outside world. As shown in Figure 1, V2X includes vehicle-to-vehicle communication (V2V), vehicle-to-pedestrian communication (V2P), vehicle-to-infrastructure communication (V2I), and vehicle-to-network communication (V2N). In V2X, unlike the uplink (UL) and downlink (DL) transmission between the terminal and the base station, direct transmission can be performed between devices. The direct link between 3GPP devices is defined as the sidelink (SL).

LTE V2X solves some basic needs in the Internet of Vehicles, but the current LTE V2X cannot effectively support future application scenarios such as fully intelligent driving and autonomous driving. With the development of the 5th generation (5G) new radio (NR) technology, how to meet the needs of a wider range of application scenarios in 5G NR V2X to further improve user experience has become an urgent problem to be solved.

Summary of the invention

The embodiments of the present application provide a data transmission method and device that can meet the needs of a wider range of application scenarios.

To achieve the above objectives, the present application embodiment adopts the following technical solutions:

In a first aspect, an embodiment of the present application provides a data transmission method, which can be executed by a first terminal device, and the first terminal device can be a terminal, or a device that can support the terminal to implement terminal functions, which can be used in conjunction with the terminal, for example, it can be a device in the terminal (such as a chip system in the terminal). The method includes:

The first terminal device receives indication information, where the indication information is used to indicate a transmission mode of the first terminal device, where the transmission mode includes one or more transmission modes including a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode or a collaborative transmission mode; the first terminal device transmits data according to the transmission mode configured by the indication information.

In this way, the first terminal device can transmit data through a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode or a collaborative transmission mode. The data transmission mode of the terminal device is enriched, so that the terminal device is not limited to direct communication, that is, it is not limited to the sender directly transmitting data to the receiver.

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

The first terminal device receives downlink control information DCI from a network device, where the DCI includes the indication information.

In the embodiment of the present application, there are the following two ways to configure a transmission strategy for a terminal device:

In configuration method 1, the network device notifies the first terminal device (i.e., the first-hop terminal device) of the transmission strategy of all terminal devices on the transmission path, and then the previous-hop terminal device indicates the transmission strategy of the next-hop terminal device to the next-hop terminal device. Correspondingly, the DCI received by the first terminal device from the network device should indicate the transmission strategy of all terminal devices. Specifically, the DCI includes one or more of the following information: first routing information, transmission mode indication, time domain resource indication of each-hop terminal device in the transmission path, frequency domain resource indication of each-hop terminal device, modulation and coding strategy MCS of each-hop terminal device, transmission power control command TPC command of each-hop terminal device or new data indicator of each-hop terminal device or redundant version of each-hop terminal, wherein the transmission mode indication is used to indicate the transmission mode, and the first routing information is used to indicate the identification of each-hop terminal device in the transmission path.

In this way, the first terminal device can send data to the second terminal device according to one or more of the configured resources, MCS, etc. Subsequently, the first terminal device can also configure a transmission strategy for the second terminal device.

In configuration method 1, after the first terminal device obtains the transmission strategy of all terminals on the transmission path from the network device, the following steps can also be performed to configure the transmission strategy of the second terminal device: the first terminal device sends side link control information SCI to the second terminal device, and the SCI includes one or more of the following information: second routing information, a transmission mode indication of the first terminal device, a time domain resource indication of the second terminal device and each hop terminal device after the second terminal device, a frequency domain resource indication of the second terminal device and each hop terminal device after the second terminal device, the MCS of the second terminal device and each hop terminal device after the second terminal device, the TPC command of the second terminal device and each hop terminal device after the second terminal device, a new data indicator of the second terminal device and each hop terminal device after the second terminal device, or a redundant version of the second terminal device and each hop terminal device after the second terminal device, and the second routing information is used to indicate the identifier of a third terminal device in the transmission path.

In this way, the second terminal device can transmit data to the next-hop terminal device according to the transmission strategy notified by the first terminal device, and can notify the next-hop terminal device of the transmission strategy of the next-hop terminal device.

By analogy, the idle resources of the terminal device can be effectively utilized to notify the transmission strategy to the terminal device at the next hop, thereby improving the resource utilization of the terminal device and reducing the signaling overhead of the network device for notifying all terminal devices of the transmission strategy.

In configuration method 2, the network device notifies all terminals on the transmission path of their respective transmission strategies. Taking the example of the network device notifying the first terminal device of its transmission strategy, the DCI received by the first terminal device from the network device includes one or more of the following information: an identifier of the second terminal device (i.e., the next-hop terminal device of the first terminal device), an identifier of the 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, the MCS of the first terminal device, the TPC command of the first terminal device, a new data indicator of the terminal, or a redundant version of the first terminal device.

In a second aspect, an embodiment of the present application provides a data transmission method, which can be executed by a network device, and the network device can be a network device, or a device that can support the network device to implement the network device function, which can be used in conjunction with the network device, for example, it can be a device in the network device (such as a chip system in the network device). The method includes:

The network device determines indication information, where the indication information is used to indicate a transmission mode of the first terminal device, where the transmission mode includes one or more transmission modes including a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode or a collaborative transmission mode; the network device sends the indication information to the first terminal device.

In one possible design, the network device determines the indication information, including: the network device obtains one or more channel state information CS I; and determines the indication information based on the one or more CS I.

In a possible design, the network device sending the indication information to the first terminal device includes:

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

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

In a possible design, the network device notifies all terminals on the transmission path of their respective transmission strategies. Taking the network device notifying the first terminal device of the transmission strategy of the first terminal device as an example, the DCI sent by the network device to the first terminal device includes one or more of the following information: the identifier of the second terminal device, the identifier 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 redundant version of the first terminal device. In other words, for each terminal device on the transmission path, the network device notifies the terminal device of its own transmission strategy to instruct the terminal device to send 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 mentioned above. The device includes: a receiver, used to receive indication information, the indication information is used to indicate a transmission mode of the first terminal device, the transmission mode includes one or more transmission modes of a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode or a collaborative transmission mode; a transmitter, used to transmit data according to the transmission mode configured by the indication information.

In one possible design, the receiver, used to receive the indication information, includes: being used to receive downlink control information DCI from a network device, the DCI including the indication information.

In one possible design, the DCI includes one or more of the following information: first routing information, a transmission mode indication, a time domain resource indication of each terminal hop in the transmission path, a frequency domain resource indication of each terminal hop, a modulation coding strategy MCS of each terminal hop, a transmission power control command TPC command of each terminal hop, or a new data indicator of each terminal hop or a redundant version of each terminal hop, wherein the transmission mode indication is used to indicate the transmission mode, and the first routing information is used to indicate the identifier of each terminal hop in the transmission path.

In one possible design, the transmitter is also used to send side link control information SCI to the second terminal device, and the SCI includes one or more of the following information: second routing information, a transmission mode indication of the first terminal device, a time domain resource indication of the second terminal device and each hop terminal device after the second terminal device, a frequency domain resource indication of the second terminal device and each hop terminal device after the second terminal device, the MCS of the second terminal device and each hop terminal device after the second terminal device, the TPC command of the second terminal device and each hop terminal device after the second terminal device, a new data indicator of the second terminal device and each hop terminal device after the second terminal device, or a redundant version of the second terminal device and each hop terminal device after the second terminal device, and the second routing information is used to indicate the identification of a third terminal device in the transmission path.

In one possible design, the DCI includes one or more of the following information: an identifier of the second terminal device, an identifier 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, the MCS of the first terminal device, a TPC command of the first terminal device, a new data indicator of the terminal, or a redundant version of the first terminal device.

In a fourth aspect, an embodiment of the present application provides a data transmission device, which may be a network device in the second aspect. The device includes: a processor, configured to determine indication information, wherein the indication information is used to indicate a transmission mode of a first terminal device, wherein the transmission mode includes one or more transmission modes of a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode, or a collaborative transmission mode; and a transmitter, configured to send the indication information to the first terminal device.

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

In one possible design, the transmitter, used to send the indication information to the first terminal device, includes: used to send downlink control information DCI to the first terminal device, the DCI including the indication information.

In one possible design, the DCI includes one or more of the following information: first routing information, a transmission mode indication, a time domain resource indication of each terminal hop in the transmission path, a frequency domain resource indication of each terminal hop, a modulation coding strategy MCS of each terminal hop, a transmission power control command TPC command of each terminal hop, a new data indicator of each terminal hop or a redundant version of each terminal hop, the transmission mode indication is used to indicate the transmission mode, and the first routing information is used to indicate the identifier of each terminal hop in the transmission path.

In one possible design, the DCI includes one or more of the following information: an identifier of the second terminal device, an identifier 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, the MCS of the first terminal device, a TPC command of the first terminal device, a new data indicator of the terminal, or a redundant version of the first terminal device.

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

In a sixth aspect, a data transmission device is provided, comprising: a processor and a memory; the memory is used to store computer execution instructions, and when the data transmission device is running, the processor executes the computer execution instructions stored in the memory, so that the data transmission device performs a data transmission method as described in any one of the first aspect or the second aspect above.

In a seventh aspect, a data transmission device is provided, comprising: a processor; the processor is used to couple with a memory, and after reading instructions in the memory, execute the data transmission method as described in any one of the first aspect or the second aspect according to the instructions.

In an eighth aspect, a computer-readable storage medium is provided, wherein instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is run on a computer, the computer can execute the data transmission method of any one of the first aspect or the second aspect.

In a ninth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the computer to execute the data transmission method of any one of the first aspect or the second aspect.

In a tenth aspect, a circuit system is provided, the circuit system comprising a processing circuit, and the processing circuit is configured to execute a data transmission method as described in any one of the first aspect or the second aspect.

In the eleventh aspect, a chip is provided, the chip includes a processor, the processor is coupled to a memory, the memory stores program instructions, and when the program instructions stored in the memory are executed by the processor, the data transmission method of any one of the first aspect or the second aspect is implemented.

In a twelfth aspect, a data transmission system is provided, which comprises the first terminal device and the network device of the above aspect.

Among them, the technical effects brought about by any design method in the second aspect to the twelfth aspect can refer to the technical effects brought about by different design methods in the first aspect, and will not be repeated here.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the architecture of a V2X system provided in an embodiment of the present application;

FIG2 is a schematic diagram of two scheduling modes provided in an embodiment of the present application;

FIG3 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

4 to 6 are schematic flow diagrams of a data transmission method provided in an embodiment of the present application;

FIG7 is an exemplary schematic diagram of an application scenario provided in an embodiment of the present application;

8 and 9 are schematic diagrams of the structure of a data transmission device provided in an embodiment of the present application.

Detailed ways

First, the technical terms of the embodiments of the present application are introduced:

Two resource allocation methods of SL:

1. Mode 3 in LTE: See (a) in Figure 2. It is mainly used in V2X communication with network coverage. The base station allocates resources according to the buffer status report (BSR) reported by the terminal. The terminal performs V2X communication on the scheduled time-frequency resources according to the scheduling grant of the base station. Among them, the scheduling request and scheduling grant use the uplink and downlink between the base station and the terminal, and the direct communication between the terminals uses SL. Of course, mode X is just a name for V2X communication scheduled by the network device, and it can also be called other names. For example, in NR, V2X communication scheduled by the network device is called mode 1 communication.

2. Mode 4 in LTE: As shown in Figure 2 (b), the terminal selects time-frequency resources from the pre-configured V2X resource pool and performs V2X communication on the selected time-frequency resources. Of course, mode X is just a name for V2X communication in which the terminal selects V2X transmission resources on its own, and it can also be called other names. For example, in NR, V2X communication in which the terminal selects V2X transmission resources on its own is called mode 2 communication.

Channel state information (CSI): In the field of wireless communications, CSI usually 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, environmental fading (fading, multipath fading or shadowing fading), and power decay of distance.

The data transmission method provided in the embodiment of the present application is mainly used in scenarios with network coverage. Referring to FIG. 3 , a communication system involved in the embodiment of the present application is shown, and the communication system includes a terminal device and a network device. The terminal device can be connected to the network device via an air interface to receive network services. The network device is mainly used to implement wireless physical layer functions, resource scheduling and wireless resource management, wireless access control, and mobility management functions.

In addition, the above-mentioned terminal devices can also communicate directly through SL, such as V2X communication. It is easy to understand that the resource pool used for the above-mentioned direct communication through SL can be a resource pool configured by the network device, such as the resource pool used when the air interface connection between the terminal device and the network device is normal, or it can be a resource pool pre-configured in the terminal device, such as the resource pool configured in the terminal device by the equipment manufacturer in advance according to the protocol before the terminal device leaves the factory.

Exemplarily, the above-mentioned terminal devices directly communicate via SL, which may be the V2V, V2I, V2N, V2P communications mentioned above, or other forms of direct communication between terminal devices, such as pedestrian to pedestrian (P2P) communication.

In addition, in addition to SL, direct communication between terminal devices can also adopt other forms or other names of wireless connections, such as future wireless communication systems, 6G systems, etc., which are not limited in this application.

The network device may refer to a network device with wireless transceiver functions, or a component (such as a chip system) arranged 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 (TRP or TP), an eNB, a radio network controller (RNC), a node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (e.g., home evolved node B, or home node B, HNB), a baseband unit (BBU), and may also be a 5G system, such as a gNB in NR, or a transmission point (TRP or TP), one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, or a network node constituting a gNB or a transmission point, such as a baseband unit (BBU), or a distributed unit (DU), etc.

In some deployments, the gNB may include a centralized unit (CU) and a distributed unit (DU). The gNB may also include a radio unit (RU). The CU implements some functions of the gNB, and the DU implements some functions of the gNB. For example, the CU implements the functions of the radio resource control (RRC), the packet data convergence protocol (PDCP) layer, and the service discovery application profile (SDAP) layer, and the DU implements the functions of the radio link control (RLC), the media access control (MAC), and the physical (PHY) layer. Since the information of the RRC layer will eventually become the information of the PHY layer, or be converted from the information of the PHY layer, under this architecture, high-level signaling, such as RRC layer signaling or PHCP layer signaling, can also be considered to be sent by the DU, or by the DU+RU. It can be understood that the network device can be a CU node, a DU node, or a device including a CU node and a DU node. In addition, the CU may be classified as a network device in an access network (radio access network, RAN), and the CU may also be classified as a network device in a core network (core network, CN), which is not limited here.

The terminal device may be a user device with wireless transceiver function or a component (such as a chip system) arranged in the user device. Exemplarily, the terminal device may also be referred to as a station (STA), user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent or user device. The terminal device includes but is not limited to: a mobile phone, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in transportation safety, a wireless terminal in smart city, a terminal in Internet of Vehicles (such as a car terminal), a sensor device such as a monitoring terminal, etc.

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

The terms "first" and "second" in the specification and drawings of the present application are used to distinguish different objects, or to distinguish different treatments of the same object, rather than to describe the specific order of objects. In addition, the terms "including" and "having" and any variations thereof mentioned in the description of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes other steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or design schemes. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way. The term "multiple" mentioned in the embodiments of the present application generally refers to two or more. Unified description here.

The following describes the data transmission method provided in an embodiment of the present application in conjunction with the communication system shown in FIG. 3 .

4 , the data transmission method of the embodiment of the present application is described below by taking the first terminal device as the data sender as an example. The data transmission method provided by the embodiment of the present application includes the following steps:

S401. A first terminal device sends a scheduling request to a network device.

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

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

The scheduling request is used for the first terminal device to obtain the 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 (UCI). Alternatively, the first terminal device sends a scheduling request to the network device through a control element (MAC CE) of a media access control layer.

S402: The network device determines instruction information.

The indication information is used to indicate a transmission mode of the first terminal device, and the transmission mode includes one or more transmission modes of a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode, or a collaborative transmission mode. Optionally, the indication information is also used to indicate a transmission path (also referred to as a communication path) of the first terminal device.

As a possible design, S402 may be specifically implemented as follows: the network device acquires one or more CSIs, and determines the indication information according to the one or more CSIs and the scheduling request. The CSI may be represented in the following matrix format:

Usually, when i and j are not equal, CSI _ij represents the CSI of the communication link between terminal i and terminal j. When i and j are equal, CSI _ij does not have actual physical meaning. Among them, CSI includes information such as channel quality indication (CQI), rank indication (RI) and precoding matrix indicator (PMI).

As a possible implementation method, the network device determines the above indication information based on the identifier of the first terminal device (initial data sender), the identifier of the destination terminal device (final data receiver) and one or more CSIs. Specifically, the network device first determines one or more available communication links based on the identifier of the first terminal device and the identifier of the destination terminal device, and then determines the communication link used for the first terminal device's current communication from multiple communication links based on the CSI of one or more communication links and/or the service type and/or QoS information of the first terminal device, and determines the transmission mode of the first terminal device's current communication. That is, after determining multiple available communication links, the communication link and transmission mode used for communication can be determined based on multiple CSIs and service types. The link and transmission mode used for communication can also be determined based on multiple CSIs and QoS information of the first terminal device. The link and transmission mode used for communication can also be determined based on multiple CSIs, QoS information of the first terminal device and service type. The link and transmission mode used for communication can also be determined based on multiple CSIs.

Optionally, the network device selects the communication link with the weakest signal scattering as the communication link for the first terminal device to communicate this time, and/or selects the communication link with the weakest environmental attenuation as the communication link for the first terminal device to communicate this time, and/or selects the communication link with the weakest distance attenuation as the communication link for the first terminal device to communicate this time. Of course, the network device may also adopt other methods to select the communication link for the first terminal device to communicate this time.

If the network device covers L terminals, L is a positive integer. Then the number of communication links managed by the network device is is a permutation and combination formula. The available communication link mentioned in the embodiment of the present application refers to the link that can be used from the source terminal device to the destination terminal device among all the communication links managed by the network device. For example, in Figure 7, the scheduler of the network device can be obtained by some scheduling algorithms, and the link that can be used for communication between terminal device A and terminal device F can be a link from A to C and then to F, or a link from A directly to F, or two links from A to C and then to F and from A to D and then to F.

Among them, when the two links A-C-F and A-D-F are used for communication between A and F, there may be two transmission modes, one of which is the cooperative transmission mode. The cooperative communication mode refers to the mode in which multiple sending terminal devices use the same resources for communication. Taking terminal A, terminal C, terminal D, and terminal F as an example, terminal A first broadcasts data to the selected C and D, and terminals C and D then send the received data to F respectively in a cooperative communication mode, that is, terminal C and terminal D broadcast source data to terminal F on the same resource. Correspondingly, terminal F receives two source data from terminals C and D on the same resource. The receiving power of terminal F on the same resource is the superposition of the receiving power of the two source data. It can be seen that the receiving power of terminal F on the same resource is improved compared with non-cooperative communication. In addition, in cooperative communication, multiple terminals can also use the same modulation and coding scheme (MCS).

Another transmission mode when communication between A and F uses two links A-C-F and A-D-F is the multipath transmission mode, that is, terminal A first sends data to C and D, and terminals C and D then send data to F respectively in a non-cooperative communication manner, that is, C and D use different resources to send data to F.

The above transmission mode of transmitting data between A and F through the link from A directly to F may be referred to as a single-hop transmission mode in the embodiment of the present application.

The above transmission mode of transmitting data between A and F through the link between A-C-F can be called a single-path multi-hop transmission mode.

The network device may determine the indication information (for indicating the transmission mode) based only on one or more CSIs. Exemplarily, the network device determines that among the above four communication paths, the CSI is better when the communication between A and F is realized through A-C-F, for example, the distance attenuation may be the smallest, then the network device determines that A and F communicate through the A-C-F link, and accordingly, the corresponding transmission mode is the multipath transmission mode.

The network device can determine the indication information (used to indicate the transmission mode) based on one or more CSIs and some other parameters. For example, the network device determines that among the above-mentioned four communication paths, the CSI between A and F is better when communicating through the two communication links A-C-F and A-D-F, such as the signal scattering is minimal, that is, through the multipath transmission mode, then the network device needs to further determine whether the multipath collaboration or non-collaborative transmission mode is adopted between A and F. Specifically, the network device determines whether the terminal devices A and F need to communicate through the multipath collaborative transmission mode according to the service type of the terminal device A, and/or the QoS information. For example, when the terminal device A performs the email service, since the email service usually requires high reliability, the collaborative transmission mode can be used to transmit the data of the terminal device A to reduce the probability of low reliability caused by the attenuation of the signal during the transmission process.

In some embodiments, the network device may also obtain one or more parameters of the first terminal device, such as power consumption, remaining power, business volume, and transmission capacity, and determine the above-mentioned indication information based on one or more of the one or more parameters and CSI. For example, when the power consumption of the first terminal device is relatively large, in order to increase the receiving power reaching the receiving end without increasing the transmitting power of the transmitting end, the data of the first terminal device may be transmitted in a collaborative transmission mode.

S403: The network device sends instruction information to the first terminal device.

Correspondingly, the first terminal device receives indication information from the network device.

It can be understood that after the network device determines the transmission mode of the first terminal device, for example, after the network device determines that the first terminal device adopts a multi-hop transmission mode, and the multi-hops sequentially include a second terminal device, a third terminal device, and a fourth terminal device, it can 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 the embodiment of the present application, the transmission strategy of each terminal device on the transmission path may be configured. The transmission strategy of a terminal device includes the transmission mode of the terminal device, the time-frequency resources used, the modulation and coding method, etc. The transmission strategy of the terminal device may be configured in the following two ways:

In implementation mode 1, the network device configures a complete transmission strategy for the first-hop terminal device (i.e., the first terminal device) in the transmission path, and the complete transmission strategy includes the transmission strategies of all the terminal devices in the transmission path. The first-hop terminal device then sends the transmission strategy of the second-hop terminal device to the second-hop terminal device, and so on, the first-hop terminal device sends the transmission strategy of the second-hop terminal device to the second-hop terminal device. In this way, the second-hop terminal device can transmit data to the next-hop terminal device of the second-hop terminal device according to the transmission strategy obtained from the first-hop terminal device.

In implementation method 1, the network device in S403 sends indication information to the first-hop terminal device (i.e., the above-mentioned first terminal device), see Figure 5, which can be specifically implemented as follows S4033a: the network device sends downlink control information (downlink control information, DCI) to the first terminal device. The DCI includes a complete transmission strategy, and the complete transmission strategy includes indication information for indicating the transmission mode of the first terminal device.

Specifically, the complete transmission strategy in the DCI includes one or more of the following information: first routing information, transmission mode indication, time domain resource indication (time resource indication) of each hop terminal device in the transmission path, frequency domain resource indication (frequency resource indication) of each hop terminal device, modulation and coding scheme (MCS) of each hop terminal device, transmission power control command TPC command of each hop terminal device or new data indicator of each hop terminal device or redundant version (redundancy version) of each hop terminal. Among them, the transmission mode indication is used to indicate the transmission mode, the first routing information is used to indicate the transmission path, and optionally, the first routing information is used to indicate the identifier of each hop terminal device in the transmission path, including the source sender, the destination receiver, and the terminal device for forwarding data between the source sender and the destination receiver. Among them, the time domain resource indication of each hop terminal device in the transmission path usually refers to the source sender, and the time domain resource indication of the terminal device for forwarding data between the source sender and the destination receiver, that is, there is no need to indicate the time domain resources of the destination receiver. The definition of other parameters can refer to the time domain resource indication, which will not be repeated here.

Exemplarily, referring to FIG7 , the network device determines that terminal A first sends data to C and D, and C and D then send data to terminal F in a collaborative communication manner, then the network device sends DCI to terminal A, and the DCI includes a complete transmission strategy, and the complete transmission strategy includes one or more of the following information: first routing information is used to indicate the two transmission paths, for example, the first routing information includes the identifiers of terminals A, C, D, and F, and indicates the hop number of each terminal in the two transmission paths; the transmission mode indicates that the first terminal device adopts a collaborative transmission mode to transmit data; the time domain of terminal device A Resource indication, for example, occupying time slots 1-3 to send data to terminal device C, occupying time slots 4-6 to send data to terminal device D, time domain resource indication of terminal device C, for example, occupying time slot 1 to send data to terminal device F, time domain resource indication of terminal device D, for example, occupying time slot 1 to send data to terminal device F (since terminals C and D adopt a collaborative communication method, the time domain resources occupied by terminal devices D and C are the same); frequency domain resource indication of terminal devices A, C, D, and F, modulation and coding scheme (MCS) of terminal devices A, C, D, and F, transmit power control (TPC) command of terminal devices A, C, D, and F, new data indicator of terminal devices A, C, D, and F; redundant versions of terminal devices A, C, D, and F.

It should be noted that the DCI may include a transmission mode indication to explicitly indicate the transmission mode of the first terminal device, that is, the transmission mode indication is used to indicate the transmission mode of the first terminal device, and the indication information includes the transmission mode indication. Of course, the DCI may not include the transmission mode indication. In this case, other information included in the DCI, such as time domain, frequency domain resource indication, MCS, etc., can implicitly indicate the transmission mode. For example, if terminals C and D use the same time domain resources, the same frequency domain resources, and the same MCS to send data to the same terminal device, it can implicitly indicate that terminals C and D use a collaborative communication method to send data. That is, the indication information includes one or more information such as time domain, frequency domain resource indication, MCS, etc. Of course, the indication information can also include a transmission mode indication for implicitly indicating the transmission mode, as well as other information for displaying the transmission mode.

Among them, for a certain terminal, such as terminal C, one or more of the time domain and frequency domain resource indication of terminal device C, MCS of terminal device C, TPC command of terminal device C, new data indicator or redundant version of terminal device C are used to indicate the transmission strategy of terminal C. As in the above scheme, the first-hop terminal device (terminal A) can obtain the transmission strategy of each-hop terminal device in the transmission path from the network device. In this way, the transmission strategy of the next-hop terminal device can be configured by the previous-hop terminal device to complete the transmission strategy configuration of each-hop terminal device.

Specifically, the previous hop terminal device configures the transmission strategy of the next hop terminal device through sidelink control information (SCI). Take the first terminal device configuring the transmission strategy for the next hop terminal device as an example. Referring to Figure 5, when the first terminal device needs to send data, after it obtains the complete transmission strategy including the indication information from the network device, that is, after S4033a, since the complete transmission strategy includes the transmission strategies of all terminal devices on the transmission path determined by the network device, the first terminal device can obtain the transmission strategy of the next hop terminal device (that is, the second terminal device) from the complete transmission strategy, and notify the second terminal device of the transmission strategy of the second terminal device by executing the following step S4033b:

S4033b, the first terminal device sends an SCI to the second terminal device, the SCI is used to indicate the transmission strategy of the second terminal device, and is also used to indicate the transmission strategy of each hop terminal device after 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 each hop terminal device after the second terminal device, frequency domain resource indication of the second terminal device and each hop terminal device after the second terminal device, MCS of the second terminal device and each hop terminal device after the second terminal device, TPC command of the second terminal device and each hop terminal device after the second terminal device, new data indicator of the second terminal device and each hop terminal device after the second terminal device, or redundant version of the second terminal device and each hop terminal device after the second terminal device. The second routing information is used to indicate the identifier of the third terminal device in the transmission path, that is, the identifier of the next hop terminal device after the second terminal device. Among them, each hop terminal device after the second terminal device does not include the destination terminal device. In other words, the destination terminal device is the final data recipient, and there is no need to indicate the transmission strategy of the destination terminal device. In this way, the second terminal device can send the data from the first terminal device to the next-hop terminal device according to the configuration based on its configured transmission strategy, that is, one or more information of the time domain resource indication, frequency domain resource indication, MCS, TPC command, new data indicator or redundant version of the second terminal device.

Similarly, still referring to FIG5 , the second terminal device receives the SCI from the first terminal device, and the second terminal device can obtain the transmission strategy of the third terminal device and the transmission strategy of the terminal device after the third terminal device (if any) from the SCI. Afterwards, the second terminal device continues to execute S4033c, that is, sends the SCI to the third terminal device, and the SCI is used to indicate the transmission strategy of the third terminal device.

Similarly, the third terminal device may also execute S4033d, ie, send an SCI to the fourth terminal device, where the SCI is used to indicate a transmission strategy of the fourth terminal device.

Exemplarily, taking the case where terminal A sends data to terminal H through terminals C and F as an example, after A obtains the complete transmission strategy (including the transmission strategy between terminal A to terminal C, terminal C to terminal F, and F to H), terminal A sends SCI to terminal C, where the SCI indicates the identifier of the next-hop terminal device of terminal C, that is, the identifier of terminal device F. In this way, after receiving the data from terminal A, terminal C can send the data from terminal A to terminal F. SCI can also indicate the transmission mode of the first terminal device, and SCI can also indicate one or more information of the time domain and frequency domain resources occupied by the data sent by terminal C to terminal F, the MCS of terminal C, the TPC command of terminal C, the new data indicator of terminal C, and the redundant version of terminal C. In this way, terminal C can send data to terminal F according to the transmission strategy. Similarly, terminal C sends SCI to terminal F, which is used to indicate that the next-hop terminal device of terminal F is H, and to indicate one or more information of the time domain and frequency domain resources occupied by the data sent by terminal F to terminal H, the MCS of terminal F, the TPC command of terminal F, the new data indicator of terminal F, and the redundant version of terminal F, or other information. It can be seen that, except for the first-hop terminal device obtaining the complete transmission strategy, other terminal devices obtain partial transmission strategies (i.e., their own transmission strategies) from the previous-hop terminal device. In this way, the transmission mode of the first terminal device transmitting data to the destination terminal device can be expanded, rather than being limited to the first terminal device directly sending data to the destination terminal device.

It should be noted that when a multipath transmission mode is used to transmit data, for example, if terminal A first sends data to terminals C and D, and terminals C and D then send data to terminal F, terminal A can send data to terminals C and D via unicast or multicast. The embodiment of the present application does not limit the specific method in which terminal A sends data.

Implementation method 2, configure the transmission strategy of the terminal device, and the network device can also configure a local transmission strategy for each hop terminal device in the transmission path, that is, the transmission strategy of all terminal devices is configured by the network device. Taking a certain terminal device as an example, the network device only configures the transmission strategy of the terminal device for the terminal device, but does not configure a complete transmission strategy for the terminal device. Specifically, for each hop terminal device in the transmission path, the network device sends DCI to the terminal device to configure the transmission strategy of the terminal device. Taking the network device configuring the transmission strategy of the first terminal device as an example, referring to Figure 6, S403 can be specifically implemented as S4033e: the network device sends downlink control information (DCI) to the first terminal device, and the DCI includes one or more of the following information: the identifier of the second terminal device (i.e., the next hop terminal device of the first terminal device), the identifier 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 redundant version of the first terminal device. In this embodiment, for a certain terminal device in the transmission path, the terminal device can obtain a local transmission strategy from the network device, that is, the transmission strategy of the terminal device itself.

Similarly, the network device can configure the local transmission strategy of other terminal devices in the transmission path. For example, the network device executes S4033f, that is, sends DCI to the second terminal device, including but not limited to the identifier of the source sender (i.e., the first terminal device), the identifier of the next hop terminal device of the second terminal device, the time domain and frequency domain resource indication of the second terminal device, and the MCS of the second terminal device, and the DCI is used to indicate the transmission strategy of the second terminal device.

The network device executes S4033g, ie sends a DCI to the third terminal device, where the DCI is used to indicate a transmission strategy of the third terminal device.

The network device executes S4033h, ie sends a DCI to the fourth terminal device, where the DCI is used to indicate a transmission strategy of the fourth terminal device.

It should be noted that the embodiment of the present application does not limit the execution order of S4033f to S4033h. That is, the network device may first send DCI to the second terminal device, and then send DCI to the third and fourth terminal devices in sequence, or send DCI to the second terminal device, the third terminal device, and the fourth terminal device at the same time.

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

For example, referring to FIG. 5 or FIG. 6 , according to the above transmission strategy, the first terminal device sends data to the second terminal device according to the above configuration of the first terminal device. Subsequently, the second terminal device sends the data to the third terminal device, and the third terminal device sends the data to the fourth terminal device, so that the first terminal device sends data to the fourth terminal device.

In the technical solution corresponding to FIG. 5 , the timing at which the previous-hop terminal device sends the SCI to the next-hop terminal device and the timing at which the previous-hop terminal device sends data to the next-hop terminal device may be the same timing or different timings. For example, the first terminal device may first send the SCI to the second terminal device, and then send the sidelink data information to the second terminal device. For another example, the first terminal device may send the sidelink data information to the second terminal device while sending the SCI to the second terminal device. The embodiment of the present application does not limit the execution order of the terminal device sending the SCI and sending the sidelink data information.

In the data transmission method provided in the embodiment of the present application, the first terminal device receives the indication information and transmits the data according to the transmission mode configured by the indication information. The transmission mode includes one or more transmission modes of a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode or a collaborative transmission mode. In this way, the first terminal device can transmit data through a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode or a collaborative transmission mode. The data transmission mode of the terminal device is enriched, so that the terminal device is not limited to direct communication, that is, it is not limited to the sender directly transmitting data to the receiver.

The above mainly introduces the solution provided by the embodiment of the present application from the perspective of interaction between different network elements. It can be understood that in order to realize the above functions, the network equipment and terminal device include hardware structures and/or software modules corresponding to the execution of each function. In combination with the units and algorithm steps of each example described in the embodiment disclosed in this application, the embodiment of the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the technical solution of the embodiment of the present application.

The embodiment of the present application can divide the network equipment and terminal devices into functional units according to the above method examples. For example, each functional unit can be divided according to each function, or two or more functions can be integrated into one processing unit. The above integrated unit can be implemented in the form of hardware or in the form of software functional units. It should be noted that the division of units in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.

FIG8 shows a possible exemplary block diagram of a data transmission device involved in an embodiment of the present application. The device 800 may exist in the form of software, or may be a device, or may be a chip that can be used for a device. The device 800 includes: a processing unit 802 and a communication unit 803 .

The processing unit 802 is used to control and manage the actions of the device 800. If the device is the above-mentioned network device, the processing unit 802 is used to support the device 800 to execute S402 in Figure 4, and/or other processes for the technology described herein. If the device is the above-mentioned first terminal device, the processing unit 802 is used to support the device 800 to control the communication unit 803 to send and receive information, and/or other processes for the technology described herein.

The communication unit 803 is used to support the communication between the device 800 and other network entities (such as terminals). If the device is the above-mentioned network device, the communication unit 803 is used to support the device 800 to perform S401, S403 in Figure 4, S4033a in Figure 5, S4033e to S4033h in Figure 6, and/or other processes for the technology described herein. If the device is the above-mentioned first terminal device, the communication unit 803 is used to support the device 800 to perform S401, S403, S404 in Figure 4, S4033b in Figure 5, and/or other processes for the technology described herein.

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

Among them, the processing unit 802 can be a processor or a controller, for example, it can be a CPU, a general processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component or any combination thereof. It can implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements a computing function, for example, including a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The communication unit 803 can be a communication interface, a transceiver or a transceiver circuit, etc., wherein the communication interface is a general term. In a specific implementation, the communication interface can include multiple interfaces, for example, it can include: an interface between a base station and a terminal and/or other interfaces. The storage unit 801 can 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 device 800 involved in the embodiment of the present application may be the device shown in FIG. 9 .

As shown in FIG9 , the device 900 includes: a processor 902, a transceiver 903, and a memory 901. Optionally, the device 900 may further include a bus 904. The transceiver 903, the processor 902, and the memory 901 may be interconnected via the bus 904; the bus 904 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus 904 may be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, FIG9 is represented by only one thick line, but it does not mean that there is only one bus or one type of bus.

Optionally, the transceiver may be an independently arranged transmitter, which may be used to send information to other devices, or an independently arranged receiver, which may be used to receive information from other devices. The transceiver may also be a component that integrates the functions of sending 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 of the embodiment of the present application is not limited to the structures shown in Figures 8 and 9 above, and may also include more or fewer devices, or have a different component layout from Figures 8 and 9.

It will be appreciated by those skilled in the art that in the above embodiments, the embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, the embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server, or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server, or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network devices (such as 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 can be integrated into one processing unit, or each functional unit can exist independently, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

Through the description of the above implementation methods, the technicians in the relevant field can clearly understand that the present application can be implemented by means of software plus necessary general hardware, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a readable storage medium, such as a computer floppy disk, hard disk or optical disk, etc., and includes a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (24)

1. A data transmission method, comprising: A first terminal device receives indication information, where the indication information is used to indicate a transmission mode of the first terminal device, where the transmission mode includes 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 an identifier of the first terminal device, one or more channel state information CSIs, and an identifier of a destination terminal device; the destination terminal device is a terminal device that receives the data; The first terminal device transmits data according to the transmission mode configured by the indication information; the configured transmission mode includes configuring the transmission strategy of the first terminal device in the transmission path, and the transmission strategy of the first terminal device includes at least one of the transmission mode of the first terminal device, the time-frequency resources used, and the modulation and coding method. 2. The data transmission method according to claim 1, wherein the first terminal device receives the indication information, comprising: The first terminal device receives downlink control information DCI from a network device, where the DCI includes the indication information. 3. The data transmission method according to claim 2 is characterized in that the DCI includes one or more of the following information: first routing information, a transmission mode indication, a time domain resource indication of each hop terminal device in the transmission path, a frequency domain resource indication of each hop terminal device, a modulation coding strategy MCS of each hop terminal device, a transmission power control command TPC command of each hop terminal device or a new data indicator of each hop terminal device or a redundant version of each hop terminal, wherein the transmission mode indication is used to indicate the transmission mode, and the first routing information is used to indicate the identifier of each hop terminal device in the transmission path. 4. The data transmission method according to claim 3 is characterized in that the method also includes: the first terminal device sends side link control information SCI to the second terminal device, and the SCI includes one or more of the following information: second routing information, a transmission mode indication of the first terminal device, a time domain resource indication of the second terminal device and each hop terminal device after the second terminal device, a frequency domain resource indication of the second terminal device and each hop terminal device after the second terminal device, the MCS of the second terminal device and each hop terminal device after the second terminal device, the TPC command of the second terminal device and each hop terminal device after the second terminal device, a new data indicator of the second terminal device and each hop terminal device after the second terminal device, or a redundant version of the second terminal device and each hop terminal device after the second terminal device, and the second routing information is used to indicate the identification of the third terminal device in the transmission path. 5. The data transmission method according to claim 2 is characterized in that the DCI includes one or more of the following information: an identifier of the second terminal device, an identifier of the 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, the MCS of the first terminal device, the TPC command of the first terminal device, a new data indicator of the terminal, or a redundant version of the first terminal device. 6. A data transmission method, comprising: The network device determines indication information, where the indication information is used to indicate a transmission mode of the first terminal device, where the transmission mode includes one or more transmission modes of a multipath transmission mode, a multi-hop transmission mode, a single-hop transmission mode, or a collaborative transmission mode; the indication information is determined by at least one of an identifier of the first terminal device, one or more channel state information CSIs, and an identifier of a destination terminal device; the destination terminal device is a terminal device that receives the data; The network device sends the indication 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 channel state information CSIs; The network device determines the indication information according to the one or more CSIs. 8. The data transmission method according to claim 6 or 7, wherein the network device sends the indication information to the first terminal device, comprising: The network device sends downlink control information DCI to the first terminal device, where the DCI includes the indication information. 9. The data transmission method according to claim 8 is characterized in that the DCI includes one or more of the following information: first routing information, a transmission mode indication, a time domain resource indication of each hop terminal device in the transmission path, a frequency domain resource indication of each hop terminal device, a modulation coding strategy MCS of each hop terminal device, a transmission power control command TPC command of each hop terminal device, a new data indicator of each hop terminal device or a redundant version of each hop terminal, the transmission mode indication is used to indicate the transmission mode, and the first routing information is used to indicate the identifier of each hop terminal device in the transmission path. 10. The data transmission method according to claim 8 is characterized in that the DCI includes one or more of the following information: an identifier of the second terminal device, an identifier of the 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, the MCS of the first terminal device, the TPC command of the first terminal device, a new data indicator of the terminal, or a redundant version of the first terminal device. 11. A data transmission device, comprising: a receiver, configured to receive indication information, the indication information being used to indicate a transmission mode of a first terminal device, the transmission mode comprising 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 being determined by at least one of an identifier of the first terminal device, one or more channel state information CSIs, and an identifier of a destination terminal device; the destination terminal device being a terminal device receiving the data; A transmitter is used to transmit data according to the transmission mode configured by the indication information; the configured transmission mode includes configuring a transmission strategy of the first terminal device in the transmission path, and the transmission strategy of the first terminal device includes at least one of the transmission mode of the first terminal device, the time-frequency resources used, and the modulation and coding method. 12. The data transmission device according to claim 11 is characterized in that the receiver is used to receive the indication information, including: being used to receive downlink control information DCI from a network device, and the DCI includes the indication information. 13. The data transmission device according to claim 12 is characterized in that the DCI includes one or more of the following information: first routing information, a transmission mode indication, a time domain resource indication of each hop terminal device in the transmission path, a frequency domain resource indication of each hop terminal device, a modulation coding strategy MCS of each hop terminal device, a transmission power control command TPC command of each hop terminal device or a new data indicator of each hop terminal device or a redundant version of each hop terminal, wherein the transmission mode indication is used to indicate the transmission mode, and the first routing information is used to indicate the identifier of each hop terminal device in the transmission path. 14. The data transmission device according to any one of claims 11 to 13 is characterized in that the transmitter is also used to send side link control information SCI to the second terminal device, and the SCI includes one or more of the following information: second routing information, a transmission mode indication of the first terminal device, a time domain resource indication of the second terminal device and each hop terminal device after the second terminal device, a frequency domain resource indication of the second terminal device and each hop terminal device after the second terminal device, the MCS of the second terminal device and each hop terminal device after the second terminal device, the TPC command of the second terminal device and each hop terminal device after the second terminal device, a new data indicator of the second terminal device and each hop terminal device after the second terminal device, or a redundant version of the second terminal device and each hop terminal device after the second terminal device, and the second routing information is used to indicate the identification of a third terminal device in the transmission path. 15. The data transmission device according to claim 12 is characterized in that the DCI includes one or more of the following information: an identifier of the second terminal device, an identifier of the 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, the MCS of the first terminal device, the TPC command of the first terminal device, a new data indicator of the terminal, or a redundant version of the first terminal device. 16. A data transmission device, comprising: a processor, configured to determine indication information, wherein the indication information is used to indicate a transmission mode of a first terminal device, wherein the transmission mode includes 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 an identifier of the first terminal device, one or more channel state information CSIs, and an identifier of a destination terminal device; the destination terminal device is a terminal device that receives the data; A transmitter is used to send the indication information to the first terminal device. 17. The data transmission device according to claim 16 is characterized in that the processor is used to determine the indication information, including: being used to obtain one or more channel state information CSI; and determining the indication information according to the one or more CSI. 18. The data transmission device according to claim 16 or 17 is characterized in that the transmitter is used to send the indication information to the first terminal device, including: used to send downlink control information DCI to the first terminal device, and the DCI includes the indication information. 19. The data transmission device according to claim 18 is characterized in that the DCI includes one or more of the following information: first routing information, a transmission mode indication, a time domain resource indication of each hop terminal device in the transmission path, a frequency domain resource indication of each hop terminal device, a modulation coding strategy MCS of each hop terminal device, a transmission power control command TPC command of each hop terminal device, a new data indicator of each hop terminal device or a redundant version of each hop terminal, the transmission mode indication is used to indicate the transmission mode, and the first routing information is used to indicate the identification of each hop terminal device in the transmission path. 20. The data transmission device according to claim 18 is characterized in that the DCI includes one or more of the following information: an identifier of the second terminal device, an identifier of the 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, the MCS of the first terminal device, the TPC command of the first terminal device, a new data indicator of the terminal, or a redundant version of the first terminal device. 21. A first terminal device, characterized in that the first terminal device comprises one or more processors and one or more memories; the one or more memories are coupled to the one or more processors, and the one or more memories are used to store computer program codes or computer instructions; When the one or more processors execute the computer program code or computer instructions, the first terminal device executes the data transmission method according to any one of claims 1 to 5. 22. A network device, characterized in that the network device comprises one or more processors and one or more memories; the one or more memories are coupled to the one or more processors, and the one or more memories are used to store computer program codes or computer instructions; When the one or more processors execute the computer program code or computer instructions, the network device executes the data transmission method according to any one of claims 6 to 10. 23. A computer-readable storage medium, characterized in that the computer-readable storage medium stores computer instructions or programs, and when the computer instructions or programs are executed on a computer, the computer executes the data transmission method according to any one of claims 1 to 5. 24. A computer-readable storage medium, characterized in that the computer-readable storage medium stores computer instructions or programs, and when the computer instructions or programs are executed on a computer, the computer executes the data transmission method according to any one of claims 6 to 10.