CN111918333A

CN111918333A - Data transmission method and device

Info

Publication number: CN111918333A
Application number: CN201910377008.2A
Authority: CN
Inventors: 马驰翔; 张伟
Original assignee: Chengdu Huawei Technology Co Ltd
Current assignee: Chengdu Huawei Technology Co Ltd
Priority date: 2019-05-07
Filing date: 2019-05-07
Publication date: 2020-11-10
Anticipated expiration: 2039-05-07
Also published as: CN111918333B

Abstract

The application provides a data transmission method and equipment, wherein the method comprises the following steps: sending first indication information and second indication information to terminal equipment, wherein the first indication information is used for indicating whether data to be transmitted is retransmission data or not, and the second indication information is used for indicating the version number of the data; and sending the data and a group identifier to the terminal equipment, wherein the group identifier is used for indicating the terminal equipment which can correctly acquire the data. The method realizes the repeated transmission of the data in the multicast transmission or the multicast transmission, does not adopt the unicast transmission mode any more, can improve the transmission efficiency of the data and solves the problem of higher time delay of the unicast transmission; because the repeated transmission of the data can be carried out in the multicast transmission or the multicast transmission, the data sent by the network equipment to the terminal equipment can be successfully received; the reliability of Uu port multicast or multicast transmission is effectively improved. Moreover, the scheme provided by this embodiment may complete multicast or multicast repeat transmission based on SC-PTM.

Description

Data transmission method and device

Technical Field

The present application relates to communications technologies, and in particular, to a data transmission method and device.

Background

With the development of communication technologies, various communication technologies are widely applied and developed. In the communication technology, a process such as data transmission is performed between a network device and a terminal device. The network device may send data to the terminal device, thereby implementing unicast transmission, but because the efficiency of unicast transmission is low, the network device may send data to the terminal device in a multicast transmission or multicast transmission manner.

In the prior art, when data transmission is performed by using multicast transmission or multicast transmission, a network device may transmit data to a plurality of terminal devices, thereby implementing multicast transmission or multicast transmission, and in the process of multicast transmission or multicast transmission, new data is transmitted to each terminal device.

However, in the prior art, in multicast transmission or multicast transmission, data sent by a network device to a terminal device may not be received by the terminal device, and how to ensure that the data sent by the network device to the terminal device can be successfully received is a problem that needs to be solved.

Disclosure of Invention

The application provides a data transmission method and device, which are used for solving the problem that how to ensure that data sent to a terminal device by a network device can be successfully received in multicast transmission or multicast transmission in the prior art.

In a first aspect, the present application provides a data transmission method, which is applied to a network device, and the method includes:

sending first indication information and second indication information to terminal equipment, wherein the first indication information is used for indicating whether data to be transmitted is retransmission data, and the second indication information is used for indicating the version number of the data; and sending the data and a group identifier to the terminal equipment, wherein the group identifier is used for indicating the terminal equipment which can correctly acquire the data.

The network device may indicate to the terminal device whether the data is new data or retransmitted data; and, the network device may indicate the version number of the data to the terminal device; and the network equipment sends the group identification to the terminal equipment, and the terminal equipment using the same group identification can correctly receive the data sent by the network equipment. Therefore, repeated transmission of data in multicast transmission or multicast transmission is realized, and a unicast transmission mode is not adopted any more, so that the transmission efficiency of the data can be improved, and the problem of higher time delay of unicast transmission is solved; moreover, because the data can be repeatedly transmitted in multicast transmission or multicast transmission, the data sent by the network equipment to the terminal equipment can be successfully received; the reliability of Uu port multicast or multicast transmission is effectively improved. Moreover, the scheme provided by this embodiment may complete multicast or multicast repeat transmission based on SC-PTM.

In a possible implementation manner, the sending the first indication information and the second indication information to the terminal device includes: and sending signaling to the terminal equipment, wherein the signaling comprises the first indication information and the second indication information.

In one possible implementation manner, the method further includes: sending third indication information and/or fourth indication information to the terminal device, wherein the third indication information is used for indicating a frequency domain resource allocation mode, and the fourth indication information is used for indicating a time domain resource allocation mode; or, the signaling further includes the third indication information and/or the fourth indication information.

In a possible implementation manner, the frequency domain resource allocation manner is a non-frequency hopping resource allocation manner, or the frequency domain resource allocation manner is a frequency hopping resource allocation manner.

In a possible implementation manner, the frequency domain resource initial position indicated by the frequency domain resource allocation manner is G_RNTImod N_RBGWherein G is_RNTIFor the purpose of the group identification,N_RBGto schedule granularity.

In a possible implementation manner, the frequency domain resource initial position indicated by the frequency domain resource allocation manner is

Wherein G is_RNTIIs the group identity, N_RBGFor scheduling granularity, K is the maximum number of repeated transmissions and i is a preset value.

Wherein G is_RNTIIs the group identity, N_RBGTo schedule granularity, i is a preset value.

In a possible implementation manner, the time domain resource allocation manner is that the network device transmits new data at an nth time granularity in consecutive downlink time granularities, and retransmits the data at an n + j th time granularity in the consecutive downlink time granularities; wherein n and j are positive integers greater than or equal to 1.

In a possible implementation manner, the time domain resource allocation manner is that the network device transmits new data at an nth time granularity and retransmits the data at an n + j + m time granularity, where the n + j time granularity to the n + j + m-1 time granularity are not downlink time granularities, and the n + j + m time granularity is downlink time granularity; n, j and m are positive integers of 1 or more.

In a possible implementation manner, the time domain resource allocation manner is that the network device transmits new data at an nth time granularity and retransmits the data at an n + j time granularity, where the n + j time granularity is a downlink time granularity; n and j are positive integers of 1 or more.

In a possible implementation manner, the time granularity is a slot, or the time granularity is a mini slot small slot.

In a second aspect, the present application provides a data transmission method, which is applied to a terminal device, and the method includes:

receiving first indication information and second indication information sent by network equipment, wherein the first indication information is used for indicating whether data to be transmitted is retransmission data, and the second indication information is used for indicating the version number of the data; and receiving the data and the group identification sent by the network equipment, wherein the group identification is used for indicating the terminal equipment which can correctly acquire the data.

In a possible implementation manner, the receiving the first indication information and the second indication information sent by the network device includes:

and receiving a signaling sent by the network equipment, wherein the signaling comprises the first indication information and the second indication information.

In one possible implementation, the method further includes: receiving third indication information and/or fourth indication information sent by the network device, wherein the third indication information is used for indicating a frequency domain resource allocation mode, and the fourth indication information is used for indicating a time domain resource allocation mode; or, the signaling further includes the third indication information and/or the fourth indication information.

In a possible implementation manner, the frequency domain resource initial position indicated by the frequency domain resource allocation manner is G_RNTImod N_RBGWherein G is_RNTIIs the group identity, N_RBGTo schedule granularity.

In a possible implementation manner, the time domain resource allocation manner is that the terminal device receives new data at an nth time granularity in consecutive downlink time granularities, and receives retransmission data at an n + j th time granularity in the consecutive downlink time granularities; wherein n and j are positive integers greater than or equal to 1.

In a possible implementation manner, the time domain resource allocation manner is that the terminal device receives new data at an nth time granularity and receives retransmission data at an nth + j + m time granularity, where the nth + j time granularity to the nth + j + m-1 time granularity are not downlink time granularities, and the nth + j + m time granularity is downlink time granularity; n, j and m are positive integers of 1 or more.

In a possible implementation manner, the time domain resource allocation manner is that the terminal device receives new data at an nth time granularity and receives retransmission data at an n + j time granularity, where the n + j time granularity is a downlink time granularity; n and j are positive integers of 1 or more.

In a third aspect, the present application provides a network device, comprising: a communication module for performing any of the methods of the first aspect.

In a fourth aspect, the present application provides a network device, comprising: a communication module for performing any of the methods of the second aspect.

In a fifth aspect, the present application provides a network device, comprising: a processor, a memory, a transmitter, and a receiver; the transmitter and the receiver are coupled to the processor, the processor controlling the transmitting action of the transmitter, the processor controlling the receiving action of the receiver;

wherein the memory is to store computer-executable program code, the program code comprising instructions; the instructions, when executed by the processor, cause the network device to perform any of the methods of the first aspect.

The transmitter is configured to transmit first indication information and second indication information to a terminal device, where the first indication information is used to indicate whether data to be transmitted is retransmission data, and the second indication information is used to indicate a version number of the data.

And the transmitter is further configured to transmit the data and a group identifier to the terminal device, where the group identifier is used to indicate the terminal device that can correctly acquire the data.

In a possible implementation manner, the transmitter is specifically configured to: and sending signaling to the terminal equipment, wherein the signaling comprises the first indication information and the second indication information.

In one possible implementation, the transmitter is further configured to: sending third indication information and/or fourth indication information to the terminal device, wherein the third indication information is used for indicating a frequency domain resource allocation mode, and the fourth indication information is used for indicating a time domain resource allocation mode; or, the signaling further includes the third indication information and/or the fourth indication information.

In a sixth aspect, the present application provides a terminal device comprising at least one processing element or chip for performing any of the implementations of the first aspect above.

In a seventh aspect, the present application provides a program product for performing any of the implementations of the first aspect above when executed by a processor.

In an eighth aspect, the present application provides a computer-readable storage medium containing the program of the seventh aspect.

In a ninth aspect, the present application provides a terminal device, comprising: a processor, a memory, a transmitter, and a receiver; the transmitter and the receiver are coupled to the processor, the processor controlling the transmitting action of the transmitter, the processor controlling the receiving action of the receiver; wherein the memory is to store computer-executable program code, the program code comprising instructions; the instructions, when executed by the processor, cause the terminal device to perform any of the methods of the second aspect.

The transmitter is configured to receive first indication information and second indication information sent by a network device, where the first indication information is used to indicate whether data to be transmitted is retransmission data, and the second indication information is used to indicate a version number of the data.

And the transmitter is further configured to receive the data and the group identifier sent by the network device, where the group identifier is used to indicate a terminal device that can correctly acquire the data.

In a possible implementation manner, the transmitter is specifically configured to:

In one possible implementation, the transmitter is further configured to: receiving third indication information and/or fourth indication information sent by the network device, wherein the third indication information is used for indicating a frequency domain resource allocation mode, and the fourth indication information is used for indicating a time domain resource allocation mode; or, the signaling further includes the third indication information and/or the fourth indication information.

Wherein G is_RNTIIs the group identity, N_RBGTo schedule granularity, iIs a preset value.

In a tenth aspect, the present application provides a network device comprising at least one processing element or chip for performing any of the implementations of the first aspect above.

In an eleventh aspect, the present application provides a program product for performing any of the implementations of the first aspect above when executed by a processor.

In a twelfth aspect, the present application provides a computer-readable storage medium containing the program of the eleventh aspect.

In a thirteenth aspect, the present application provides a communication system comprising: a terminal device provided by the fifth aspect and a network device provided by the ninth aspect.

Drawings

Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application;

fig. 2 is a signaling diagram of a data transmission method according to an embodiment of the present application;

fig. 3 is a signaling diagram of another data transmission method according to an embodiment of the present application;

fig. 4 is a signaling diagram of another data transmission method according to an embodiment of the present application;

fig. 5 is a schematic block diagram of a network device according to an embodiment of the present application;

fig. 6 is a schematic block diagram of a terminal device according to an embodiment of the present application;

fig. 7 is a schematic block diagram of another network device provided in an embodiment of the present application;

fig. 8 is a schematic block diagram of another terminal device provided in an embodiment of the present application.

Detailed Description

The embodiments of the present application are applied to an existing communication system, or a fifth-Generation mobile communication technology (5th-Generation, 5G) communication system, or other systems that may appear in the future, for example, the present application can be applied to a second Generation mobile communication technology (2th-Generation, 2G) wireless communication system represented by a Universal Mobile Telecommunications System (UMTS) system, a Code Division Multiple Access (CDMA) system, a third Generation mobile communication technology (3th-Generation, 3G) wireless communication system represented by a Wideband Code Division Multiple Access (WCDMA), a fourth Generation mobile communication technology (4th-Generation, 4G) wireless communication system represented by a Long Term Evolution (LTE), a Wireless Local Area Network (WLAN), a future 5G wireless communication system, or the like. Some terms in the present application are explained below to facilitate understanding by those skilled in the art. It should be noted that, when the scheme of the embodiment of the present application is applied to a 5G system or other systems that may appear in the future, names of network devices, terminal devices, and network devices may change, but this does not affect implementation of the scheme of the embodiment of the present application.

1) A terminal device, also called a terminal, a user device, is a device providing voice and/or data connectivity to a user, e.g. a handheld device with wireless connection capability, a vehicle mounted device, etc. Common terminal devices include, for example: cell-phone, panel computer, notebook computer, palm computer, Mobile Internet Device (MID), wearable equipment, wherein, wearable equipment includes for example: smart watches, smart bracelets, pedometers, and the like.

2) A network device, also called a Radio Access Network (RAN) device, is a device that accesses a terminal device to a wireless network through a licensed spectrum and an unlicensed spectrum, and includes network devices in various communication systems, such as but not limited to: a wireless access point (e.g., a wireless local area network access point), a Base Station (BS), an evolved Node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a network equipment controller (BSC), a network equipment transceiver station (BTS), a Home network equipment (e.g., a Home evolved Node B, or Home Node B, HNB), a baseband unit (BBU), and the like. The base station includes, but is not limited to: enhanced NodeB (eNB) defined in Long Term Evolution (LTE), next generation NodeB (gNB) defined in New Radio (NR).

3) Multicast transmission: at least including transmission through a Physical Multicast Channel (PMCH) and transmission through a Physical Downlink Shared Channel (PDSCH).

4) "plurality" means two or more, and other terms are analogous. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application. The networking architecture shown in fig. 1 mainly includes a network device 01 and at least one terminal device 02. Communication is performed between the network device 01 and each of the terminal devices 02. Further, the network device 01 and the terminal device 02 can communicate with each other through a wireless communication system.

Among them, services supported by wireless communication systems have also been developed from initial voice and short messages to support wireless high-speed data communication. Moreover, the number of wireless connections worldwide is undergoing a continuous high-speed increase, and various new wireless service types, such as internet of things, autonomous driving, etc., are emerging in large numbers, which all put higher demands on the next generation wireless communication system, namely NR.

The manner of resource allocation during transmission and the communication process between devices will be described below by taking NR-vehicle user equipment (in V2X) as an example.

In NR-V2X, two types of air interfaces are defined. The first is a terrestrial radio access network and user equipment (UTRAN UE, Uu) port, which defines the communication protocol between the terminal equipment and the network equipment; wherein, the Uu port defines a transmission protocol similar to the uplink and downlink in NR, the transmission protocol basically follows the uplink and downlink transmission protocol of NR in terms of frequency band allocation, bandwidth, frame structure, transmission mode, signaling definition, etc., and some special signaling for V2X is added on the basis. The second is a near field communication (PC 5) port, and a PC5 port defines a communication protocol between the terminal device and the terminal device; the PC5 port is different from the Uu port, for example, in terms of frequency band, it may consider multiplexing NR uplink frequency band, and may also adopt unlicensed frequency band; the PC5 port adopts a proprietary frame structure and pilot design; in addition, in terms of beam management and multiple-input multiple-output (MIMO), the beam management and MIMO are simplified based on the design and principle of NR.

The PC5 port defines two resource allocation modes during transmission. A resource allocation method, a network device dynamically allocates transmission resources in real time, and the transmission resources are transmission resources of a terminal device on a Sidelink (Sidelink) interface. In another resource allocation, the network device pre-configures a transmission resource pool, where the transmission resource pool is a transmission resource pool on a Sidelink (Sidelink) interface of the terminal device, and then, different terminal devices use specific resources in the transmission resource pool; when the terminal equipment uses the resources in the transmission resource pool, the terminal equipment negotiates to allocate the resources in the transmission resource pool.

For example, in NR-V2X transmissions, highway (highway) and city (urban) scenarios are involved. In the expressway scene, because no crossroads exist on the expressway field, the traveling directions of vehicles are only two; in the city scene, since an intersection is set in a city, there are four possibilities for the traveling direction of the vehicle, and the vehicle is used as the terminal device. In the process of vehicle traveling, the vehicle needs to acquire real-time road condition information and download a high-definition map; therefore, vehicles in the same direction can obtain a high-definition map and real-time road conditions in any one of unicast, multicast and multicast (same grouping) modes; vehicles in different directions can obtain high-definition maps and real-time road conditions in any one of unicast, multicast and multicast (different grouping) modes due to the fact that the required high-definition maps and the required road condition information are different.

In various wireless communication systems, several data transmission methods can be used.

A first transmission mode. The mechanism of multicast transmission can be realized by single-cell point-to-multipoint (SC-PTM), for example, the SC-PTM can be applied to an LTE communication system; a mechanism for realizing multicast transmission through SC-PTM, the main principle is that network equipment indicates a group Identity (ID) through a radio network temporary group identity (G-RNTI) based on a PDSCH, namely the group identity is G-RNTI; then, the network equipment sends data to the terminal equipment; then, all terminal devices having the group identity of G-RNTI receive data through the PDSCH, and the terminal devices demodulate the PDSCH to obtain data. Therefore, the function of multicast transmission from the network equipment to a plurality of terminal equipment is realized.

The first transmission mode is realized by SC-PTM as a single transmission process, i.e. the network equipment can only send new data to the terminal equipment; in addition, in the above process, the terminal device receives much interference in the process of receiving data through the PDSCH, so that the reliability of demodulating the PDSCH by the terminal device is not high, and the terminal device is likely to obtain wrong data.

And a second transmission mode. The mechanism of unicast transmission can be realized by PDSCH, for example, the method can be applied to LTE communication system and NR communication system. The network equipment indicates the identification of the terminal equipment based on a cell radio network temporary identifier (C-RNTI); then, the network equipment sends data to the terminal equipment; then, all terminal devices indicated as C-RNTI receive data through the PDSCH, and the terminal devices demodulate the PDSCH to get the data.

The second transmission mode is also unicast transmission, and when the network device transmits the same data to multiple terminal devices, the network device needs to transmit the same data for multiple times, that is, the network device needs to sequentially transmit the same data to each of the multiple terminal devices; thereby causing high delay, for example, the reception delay of the terminal device receiving data later is high; i.e., time efficiency is not high. Multiple resources are needed to transmit the same data, and the resource utilization rate is low; moreover, since multiple resources are required to transmit the same data, when the data amount of the data is large, the transmission delay is high.

As can be seen from the above description, unicast transmission can be achieved, but the efficiency of unicast transmission is low.

The network device may send data to the terminal device by multicast transmission or multicast transmission. However, when data transmission is performed by multicast transmission or multicast transmission, the network device transmits new data to each terminal device; data sent by the network device to the terminal device may not be received by the terminal device. Therefore, there is a need to provide a method for ensuring that data sent by a network device to a terminal device can be successfully received in multicast transmission or multicast transmission.

Fig. 2 is a signaling diagram of a data transmission method according to an embodiment of the present application. As shown in fig. 2, the method includes:

s11, the network device sends first indication information and second indication information to the terminal device, where the first indication information is used to indicate whether the data to be transmitted is retransmission data, and the second indication information is used to indicate a version number of the data.

Optionally, step S11 specifically includes: the network equipment sends signaling to the terminal equipment, wherein the signaling comprises first indication information and second indication information.

Illustratively, a network device may communicate with a plurality of terminal devices. In order to implement the multicast or the process of repeated transmission in the multicast, the network device needs to send the first indication information and the second indication information to each terminal device.

The first indication information may indicate whether data to be transmitted by the network device is retransmission data. Optionally, when the first indication information is first information, the first indication information represents data to be transmitted by the network device, and the data is not retransmission data, that is, the data to be transmitted by the network device is represented as new data; when the first indication information is the second information, the first indication information represents data to be transmitted by the network device, and the data is retransmission data. The specific content and format of the first information and the second information are not limited; for example, the first information and the second information may be bytes, or may be decimal numbers, or may be binary numbers.

Alternatively, the first indication information may be a New Data Indicator (NDI).

The second indication information may indicate a version number corresponding to data to be transmitted by the network device; wherein, the version number is the version number of new data or the version number of retransmission data. Optionally, the second indication information uses different third information to represent different version numbers; for example, when the third information is content 1, the second indication information indicates that the version number of the data is one version number, and when the third information is content 2, the second indication information indicates that the version number of the data is another version number, and so on. Wherein, the specific content and format of the third information are not limited; for example, the third information may be a byte, or may be a decimal number, or may be a binary number.

Optionally, the second indication information may be a retransmission version number (RV index).

Optionally, the implementation manner of step S11 is: the network device transmits the first indication information and the second indication information to the terminal device by using any one of radio resource management (RRC) signaling, medium access control-control element (MAC-CE) signaling, and Downlink Control Information (DCI) signaling. Alternatively, the signaling may be other higher layer signaling.

The DCI signaling is taken as an example for introduction. The network device sends a DCI signaling to the terminal device through a Physical Downlink Control Channel (PDCCH), where the DCI signaling carries the first indication information and the second indication information; optionally, the first indication information is an NDI, and the second indication information is an RV index.

For example, when the first indication information is 1, the first indication information indicates that the data is new data; when the first indication information is 0, the first indication information indicates that the data is retransmission data.

For example, when the second indication information is 0, the second indication information indicates that 0 is a version number of the new data. When the second indication information is a number other than 0, the second indication information indicates the number other than 0 and is the version number of the retransmission data; for example, when the second indication information is 1, the second indication information indicates that 1 is a version number of the retransmission data; when the second indication information is 2, the second indication information indicates that 2 is the version number of the retransmission data; when the second indication information is 3, the second indication information indicates that 3 is the version number of the retransmission data; and so on.

In addition, in the present application, the format of DCI signaling is not limited; for example, the format of the DCI signaling may be a custom format, or the format of the DCI signaling may be a format of a prior art DCI signaling.

For example, two fields may be added in the DCI signaling in the prior art to indicate the first indication information and the second indication information, respectively. The first indication information is NDI, the second indication information is RV index, and table 1 is DCI signaling, as shown in table 1; two fields are added in the DCI signaling in the prior art, NDI occupies 1bit (bits), and RV index occupies 2 bits.

TABLE 1 DCI Signaling

NDI	RV index
		1bit	2bits

And S12, the network equipment sends the data and the group identification to the terminal equipment, wherein the group identification is used for indicating the terminal equipment which can correctly acquire the data.

Exemplarily, the network device sends the group identifier to the terminal device, and optionally, the network device sends the group identifier to the terminal device through the PDCCH; alternatively, in step S11, the group identifier may be sent to the terminal device together with the first indication information and the second indication information in step S11, that is, the network device sends the first indication information, the second indication information and the group identifier to the terminal device through signaling. And, the network device transmits data to the terminal device through the PDSCH. Wherein, the data is the data to be transmitted in the step S11; the group identifier indicates at least one terminal device, each terminal device of the at least one terminal device may correctly receive the data sent by the network device, and the other terminal devices may not correctly receive the data sent by the network device. And, because the network device sends the group identifier, the transmission process of sending data to the terminal device by the network device is indicated, and the transmission process is multicast or multicast.

In the present application, the specific format and content of the group id are not limited. Optionally, the group identifier includes, but is not limited to, a G-RNTI and a Radio Network Temporary Identifier (RNTI).

Optionally, after step S12, the method further includes:

and S13, acquiring the data sent by the network equipment by using the terminal equipment identified by the same group.

Illustratively, since the terminal device identified by the group is used in step S12, the data transmitted by the network device can be correctly received.

The terminal device may detect the group id sent by the network device, where the group id is the group id sent by the network device in step S12. For example, when the network device sends the group identifier to the terminal device through the PDCCH, the terminal device may detect the group identifier included in the PDCCH.

Then, the terminal device already knows the own group identifier in advance; the terminal device may determine whether the group identifier included in the PDSCH is consistent with a group identifier known in advance; if the two groups are consistent, the terminal equipment determines that the terminal equipment belongs to the group indicated by the group identification contained in the PDSCH. Then, the terminal device may receive the complete data on the PDSCH, which is the data sent by the network device in step S12.

Then, the terminal device may determine whether the received data is retransmission data and a version number of the data according to the first indication information and the second indication information. When the first indication information indicates that the data is new data and the second indication information indicates the version number of the new data, the terminal device receives complete data on the PDSCH, and does not merge the data received in history; the terminal device then demodulates the received complete data. When the first indication information indicates that the data is retransmission data and the second indication information indicates the version number of the retransmission data, the terminal device receives complete data on the PDSCH, and merges the historical received data and the currently received data; then, the terminal device demodulates the combined data.

For example, when the NDI is 1, the terminal device determines that the data is new data, the terminal device receives complete data on the PDSCH, and the terminal device does not combine the data received in the history. When the NDI is 0, the terminal device determines that the data is retransmission data, receives complete data on the PDSCH, and merges the data received in history with the data received currently.

In this embodiment, a network device sends first indication information and second indication information to a terminal device, where the first indication information is used to indicate whether data to be transmitted is retransmission data, and the second indication information is used to indicate a version number of the data; the network equipment sends data and a group identification to the terminal equipment, wherein the group identification is used for indicating the terminal equipment which can correctly acquire the data. The network device may indicate to the terminal device whether the data is new data or retransmitted data; and, the network device may indicate the version number of the data to the terminal device; and the network equipment sends the group identification to the terminal equipment, and the terminal equipment using the same group identification can correctly receive the data sent by the network equipment. Therefore, repeated transmission of data in multicast transmission or multicast transmission is realized, and a unicast transmission mode is not adopted any more, so that the transmission efficiency of the data can be improved, and the problem of higher time delay of unicast transmission is solved; moreover, because the data can be repeatedly transmitted in multicast transmission or multicast transmission, the data sent by the network equipment to the terminal equipment can be successfully received; the reliability of Uu port multicast or multicast transmission is effectively improved. Moreover, the scheme provided by this embodiment may complete multicast or multicast repeat transmission based on SC-PTM.

Fig. 3 is a signaling diagram of another data transmission method according to an embodiment of the present application. As shown in fig. 3, the method includes:

s21, the network device sends first indication information and second indication information to the terminal device, where the first indication information is used to indicate whether the data to be transmitted is retransmission data, and the second indication information is used to indicate a version number of the data.

For example, this step may be referred to as step S11 shown in fig. 2, and is not described again.

S22, the network device sends third indication information and/or fourth indication information to the terminal device, where the third indication information is used for indicating a frequency domain resource allocation manner, and the fourth indication information is used for indicating a time domain resource allocation manner.

Optionally, the frequency domain resource allocation manner is a non-frequency hopping resource allocation manner, or the frequency domain resource allocation manner is a frequency hopping resource allocation manner.

Optionally, the frequency domain resource allocation manner includes the following implementation manners:

the first implementation manner of the frequency domain resource allocation manner is as follows: the frequency domain resource initial position indicated by the frequency domain resource allocation mode is G_RNTImod N_RBGWherein G is_RNTIIs a group identification, N_RBGTo schedule granularity.

A second implementation manner of the frequency domain resource allocation manner: the frequency domain resource initial position indicated by the frequency domain resource allocation mode is

Wherein G is_RNTIIs a group identification, N_RBGFor scheduling granularity, K is the maximum number of repeated transmissions and i is a preset value.

A third implementation manner of the frequency domain resource allocation manner: the frequency domain resource initial position indicated by the frequency domain resource allocation mode is

Wherein G is_RNTIIs a group identification, N_RBGTo schedule granularity, i is a preset value.

Optionally, the time domain resource allocation manner includes the following several implementation manners, and in the following several implementation manners, the involved time granularity is a slot (slot) or a mini slot (slot):

the first implementation manner of the time domain resource allocation manner is as follows: the network equipment transmits new data at the nth time granularity in the continuous downlink time granularity and retransmits the data at the (n + j) th time granularity in the continuous downlink time granularity; wherein n and j are positive integers greater than or equal to 1.

A second implementation manner of the time domain resource allocation manner: the network equipment transmits new data on the nth time granularity and retransmits the data on the (n + j + m) th time granularity, wherein the (n + j) th time granularity to the (n + j + m-1) th time granularity are not downlink time granularity, and the (n + j + m) th time granularity is downlink time granularity; n, j and m are positive integers of 1 or more.

A third implementation manner of the time domain resource allocation manner: the time domain resource allocation mode is that the network equipment transmits new data on the nth time granularity and retransmits the data on the (n + j) th time granularity, wherein the (n + j) th time granularity is downlink time granularity; n and j are positive integers of 1 or more.

For example, the network device may indicate the frequency domain resource allocation manner to the terminal device, or the network device may indicate the time domain resource allocation manner to the terminal device, or the network device may indicate the frequency domain resource allocation manner and the time domain resource allocation manner to the terminal device. Optionally, the frequency domain resource allocation manner is a frequency domain resource allocation manner based on SC-PTM, and the time domain resource allocation manner is a time domain resource allocation manner based on SC-PTM.

Illustratively, the network device may send third indication information to the terminal device, where the third indication information may indicate a frequency domain resource allocation manner used when performing multicast or multicast transmission; or, the network device may send fourth indication information to the terminal device, where the fourth indication information may indicate a time domain resource allocation manner used when performing multicast or multicast transmission; alternatively, the network device may send the third indication information and the fourth indication information to the terminal device.

Optionally, the third indication information uses different bit information to represent different frequency domain resource allocation manners; the fourth indication information uses different bit information to represent different time domain resource allocation modes.

For example, table 2 is the third indication information, as shown in table 2, if the third indication information is bit information 00, the third indication information indicates the first frequency domain resource allocation manner; if the third indication information is bit information 01, the third indication information indicates a second frequency domain resource allocation mode; if the third indication information is bit information 10, the third indication information indicates a third frequency domain resource allocation mode; the third indication information is bit information 11, which is temporarily reserved at this time, and a specific frequency domain resource allocation manner may be set according to the requirements of the terminal device, the network device, and the protocol.

TABLE 2 third indication information

Bit information	Indicating the content
		00	Frequency domain resource allocation mode one
01	Frequency domain resource allocation mode two
		10	Frequency domain resource allocation mode three
11	Retention

For example, table 3 is the fourth indication information, as shown in table 3, if the fourth indication information is bit information 0, the fourth indication information indicates a first time domain resource allocation manner; if the fourth indication information is bit information 1, the fourth indication information indicates a second time domain resource allocation mode; other bit information can be set as a temporary reserved bit, and a specific time domain resource allocation mode can be set according to the requirements of terminal equipment, network equipment and a protocol.

TABLE 3 fourth instruction information

Bit information	Indicating the content
		0	Time domain resource allocation mode one
1	Time domain resource allocation mode two

In this embodiment, the frequency domain resource allocation method may be a non-frequency hopping resource allocation method or a frequency hopping resource allocation method. The non-frequency hopping resource allocation means that no matter how many times data are transmitted, the frequency domain resource used by the network device when the network device currently transmits data is the same as the frequency domain resource used by the network device when the network device transmits the data for the first time. The resource allocation mode of frequency hopping means that the frequency domain resources used by the network device each time data is transmitted may be the same or different; the resource location of the frequency domain resources is determined in some way. For the frequency domain resource allocation, the following several implementations are provided.

A first implementation of a frequency domain resource allocation. The network device may employ formula G_RNTI mod N_RBGDetermining the initial position of the allocated frequency domain resource, i.e. the initial position of the frequency domain resource is G_RNTI mod N_RBG(ii) a At this time, G_RNTIIdentifying the group; n is a radical of_RBGFor scheduling granularity, schedulingThe granularity refers to the number of Resource Blocks (RBs) contained in a sub-band when the network device schedules frequency domain resources; k is the maximum number of repeated transmission, and i is a preset value; other identifiers can be adopted for the group identifier, for example, when the group identifier is a G-RNTI, the group identifier can adopt a G_G-RNTIRepresents; when the group identifier is the RNTI, the group identifier may adopt G_RNTIRepresents; in this case, the frequency domain resource allocation scheme is a non-frequency hopping frequency domain resource allocation scheme.

A second implementation of the frequency domain resource allocation. The network device may employ a formula

Determining the initial position of the allocated frequency domain resource, i.e. the initial position of the frequency domain resource is

In this case, the meaning of the letter in the formula may refer to the above description, where i is a preset value, or i may also be other values, for example, i is a version number of data, and when i is the version number of data, the version number of data needs to be less than K; similarly, other group identifiers may be used, for example, when the group identifier is a G-RNTI, the group identifier may be G_G-RNTIRepresents; when the group identifier is the RNTI, the group identifier may adopt G_RNTIRepresents; in this case, the frequency domain resource allocation scheme is a frequency hopping frequency domain resource allocation scheme.

A third implementation of the frequency domain resource allocation. The network device may employ a formula

In this case, the meaning of the letter in the formula can be referred to the introduction of the second implementation manner of the frequency domain resource allocation manner. In this case, the frequency domain resource allocation scheme is a frequency hopping frequency domain resource allocation scheme.

In any implementation manner of the frequency domain resource allocation manner, since the group identifier is used to determine the starting position of the frequency domain resource, different group identifiers can be used to distinguish resource positions of terminal devices belonging to different group identifiers, thereby reducing the possibility that different terminal devices belonging to different group identifiers use the same block of resource.

Then, after the network device determines the frequency domain resource starting position by adopting any one of the above frequency domain resource allocation manners, the network device determines the frequency domain resource according to the frequency domain resource starting position. Then, in step S23, the network device may send data to the terminal device according to the frequency domain resources; then, in step S24, the terminal device using the same group identifier may determine a frequency domain resource allocation manner according to the received third indication information, and then the terminal device receives complete data on the PDSCH according to the frequency domain resource allocation manner.

For example, if the third indication information is bit information 00, the third indication information indicates a frequency domain resource allocation manner, which is a first implementation manner of the frequency domain resource allocation manner; if the third indication information is bit information 01, the third indication information indicates a frequency domain resource allocation mode, and the third indication information is a second implementation mode of the frequency domain resource allocation mode; if the third indication information is bit information 10, the third indication information indicates a frequency domain resource allocation manner, which is a third implementation manner of the frequency domain resource allocation manner.

In this embodiment, for the time domain resource allocation manner, the following several implementation manners are provided.

One frame (frame) consists of at least one subframe (subframe), one subframe consists of at least one slot (slot), and one slot may consist of at least one mini slot; wherein, in the standard protocol, the mini slot can be called non-slot based scheduling. slots, mini slots may be used as time granularity.

A first implementation of a time domain resource allocation approach. When the time granularity is a slot, if there is a continuous downlink slot, if the network device sends new data to the terminal device on the nth slot, the network device may send retransmission data to the terminal device in n + j slots of the continuous downlink slot. Wherein n and j are positive integers greater than or equal to 1. At this time, the terminal device receives new data sent by the network device in the nth slot; then, the terminal or device receives and demodulates the new data; because there are continuous downlink slots, the (n + j) th slot is a downlink slot, and the terminal device receives the retransmission data sent by the network device at the (n + j) th slot of the continuous downlink slots; then, the terminal equipment combines the data received in the nth slot with the data received in the (n + j) th slot to obtain combined data; then, the terminal device demodulates the combined data.

When the time granularity is min slot, if there is continuous downlink min slot, if the network device sends new data to the terminal device on the nth min slot, the network device may send retransmission data to the terminal device in n + j min slots of the continuous downlink min slot. At this time, the terminal device receives new data sent by the network device on the nth min slot; then, the terminal or device receives and demodulates the new data; because there are consecutive downlink min slots, the (n + j) th min slot is a downlink min slot, and the terminal device receives the retransmission data sent by the network device at the (n + j) th min slot of the consecutive downlink min slots; then, the terminal equipment combines the data received on the nth min slot and the data received on the (n + j) th min slot to obtain combined data; then, the terminal device demodulates the combined data.

A second implementation of the time domain resource allocation approach. When the time granularity is a slot, if there is no continuous downlink slot, if the network device sends new data to the terminal device on the nth slot, and the nth + j time granularity is not a downlink slot, the network device needs to find the nearest downlink slot in time sequence from the nth + j +1 slot; then, the network equipment determines that the (n + j + m) th slot is a downlink slot, and at the moment, the (n + j) th time granularity to the (n + j + m-1) th time granularity are not downlink time granularity; the network device may then send the retransmission data to the terminal device on n + j + m slots. Wherein m is a positive integer of 1 or more. At this time, the terminal device receives new data sent by the network device in the nth slot; then, the terminal or device receives and demodulates the new data; because there is no continuous downlink slot, but the n + j + m slots are downlink slots, the terminal device may receive the retransmission data sent by the network device on the n + j + m slots; then, the terminal equipment combines the data received on the nth slot and the data received on the (n + j + m) th slot to obtain combined data; then, the terminal device demodulates the combined data.

When the time granularity is a min slot, if no continuous downlink min slot exists, if the network device sends new data to the terminal device on the nth min slot and the nth + j time granularity is not the downlink min slot, the network device needs to find the nearest downlink min slot according to the time sequence from the nth + j +1 min slot; then, the network equipment determines that the (n + j + m) th min slot is a downlink min slot, and at the moment, the (n + j) th time granularity to the (n + j + m-1) th time granularity are not downlink time granularity; then, the network device may send the retransmission data to the terminal device on n + j + m min slots. Wherein m is a positive integer of 1 or more. At this time, the terminal device receives new data sent by the network device on the nth min slot; then, the terminal or device receives and demodulates the new data; because there is no continuous downlink min slot, but the (n + j + m) th min slot is a downlink min slot, the terminal device may receive the retransmission data sent by the network device at the (n + j + m) th min slot; then, the terminal equipment combines the data received on the nth min slot and the data received on the (n + j + m) th min slot to obtain combined data; then, the terminal device demodulates the combined data.

A third implementation of the time domain resource allocation approach. When the time granularity is a slot, if there is no continuous downlink slot, the network device may send the retransmission data to the terminal device at n + j slots if the network device sends new data to the terminal device at n slot, and the n + j time granularity is a downlink slot. At this time, the terminal device receives new data sent by the network device in the nth slot; then, the terminal or device receives and demodulates the new data; because there is no continuous downlink slot, but the (n + j) th slot is a downlink slot, the terminal device may receive the retransmission data sent by the network device in the (n + j) th slot; then, the terminal equipment combines the data received in the nth slot with the data received in the (n + j) th slot to obtain combined data; then, the terminal device demodulates the combined data.

When the time granularity is a min slot, if there is no continuous downlink min slot, the network device may send new data to the terminal device at the nth min slot, and if the nth + j time granularity is a downlink min slot, the network device may send retransmission data to the terminal device at the n + j min slots. At this time, the terminal device receives new data sent by the network device on the nth min slot; then, the terminal or device receives and demodulates the new data; because there is no continuous downlink min slot, but the (n + j) th min slot is a downlink min slot, the terminal device may receive the retransmission data sent by the network device at the (n + j) th min slot; then, the terminal equipment combines the data received on the nth min slot and the data received on the (n + j) th min slot to obtain combined data; then, the terminal device demodulates the combined data.

In the frequency domain resource allocation manner, j may be taken from 1; the value of n is determined by the network device, for example, the value of n is configured by the network device through a high-level signaling.

The second implementation manner and the third implementation manner of the time domain resource allocation manner may be combined into one implementation manner. For example, if the fourth indication information is bit information 0, the fourth indication information indicates a time domain resource allocation manner, which is a first implementation manner of the time domain resource allocation manner; if the fourth indication information is bit information 1, the fourth indication information indicates a time domain resource allocation manner, which is a second implementation manner and a third implementation manner of the time domain resource allocation manner.

In the embodiment of the present application, the execution order of step S21 and step S22 is not limited, and step S21 may be executed first, and step S22 may be executed later; step S22 may be executed first, and then step S21 may be executed; step S21 and step S22 may be executed simultaneously.

And S23, the network equipment sends the data and the group identification to the terminal equipment, wherein the group identification is used for indicating the terminal equipment which can correctly acquire the data.

For example, this step can be referred to step S12 shown in fig. 2 and step S22 of this embodiment, and is not described again.

Based on the above implementation manner in step S22, when the network device sends the third indication information to the terminal device, the network device sends data to the terminal device by using the frequency domain resource allocation manner indicated by the third indication information and the preset time domain resource allocation manner in the prior art; therefore, the terminal device receives the data sent by the network device by adopting the frequency domain resource allocation mode indicated by the third indication information and the preset time domain resource allocation mode in the prior art.

When the network device sends the fourth indication information to the terminal device, the network device sends data to the terminal device by adopting a time domain resource allocation mode indicated by the fourth indication information and a preset frequency domain resource allocation mode in the prior art; therefore, the terminal device receives the data sent by the network device by using the time domain resource allocation mode indicated by the fourth indication information and the preset frequency domain resource allocation mode in the prior art.

When the network equipment sends the third indication information and the fourth indication information to the terminal equipment, the network equipment sends data to the terminal equipment by adopting a frequency domain resource allocation mode indicated by the third indication information and a time domain resource allocation mode indicated by the fourth indication information; therefore, the terminal device receives the data sent by the network device by using the frequency domain resource allocation mode indicated by the third indication information and the time domain resource allocation mode indicated by the fourth indication information.

And S24, acquiring the data sent by the network equipment by using the terminal equipment identified by the same group.

For example, this step can be referred to step S13 shown in fig. 2 and step S22 of this embodiment, and is not described again.

In this embodiment, on the basis of the foregoing embodiment, the network device may further send third indication information and/or fourth indication information to the terminal device, where the third indication information is used to indicate the frequency domain resource allocation manner, and the fourth indication information is used to indicate the time domain resource allocation manner. Therefore, the network device can send data to the terminal device by the determined frequency domain resource allocation mode and/or time domain resource allocation mode; and the terminal equipment receives the data sent by the network equipment according to the frequency domain resource allocation mode and/or the time domain resource allocation mode indicated by the network equipment. And the group identifier is used to determine the frequency domain resource starting position, so that different group identifiers can be used to distinguish the resource positions of terminal devices belonging to different group identifiers, thereby reducing the possibility that different terminal devices belonging to different group identifiers use the same block of resources.

Fig. 4 is a signaling diagram of another data transmission method according to an embodiment of the present application. As shown in fig. 4, the method includes:

s31, the network device sends a signaling to the terminal device, where the signaling includes first indication information and second indication information, and the signaling further includes third indication information and/or fourth indication information, where the first indication information is used to indicate whether the data to be transmitted is retransmission data, the second indication information is used to indicate a version number of the data, the third indication information is used to indicate a frequency domain resource allocation manner, and the fourth indication information is used to indicate a time domain resource allocation manner.

Illustratively, the network device transmits the first indication information and the second indication information, and transmits the third indication information and/or the fourth indication information to the terminal device by adopting any one of RRC signaling, MAC-CE signaling, DCI signaling and other higher layer signaling. That is, the signaling carries the first indication information and the second indication information, and the signaling carries the third indication information and/or the fourth indication information.

The DCI signaling is taken as an example for introduction. And the network equipment sends the DCI signaling to the terminal equipment through the PDCCH. Wherein, the DCI signaling carries the first indication information and the second indication information; optionally, the first indication information is an NDI, and the second indication information is an RV index. And, the DCI signaling carries the third indication information and/or the fourth indication information.

For example, four fields may be added in the DCI signaling in the prior art to respectively indicate the first indication information, the second indication information, the third indication information, and the fourth indication information. The first indication information is NDI, the second indication information is RVindex, the third indication information is frequency domain resource allocation mode indication, and the fourth indication information is time domain resource allocation mode indication. Table 4 shows DCI signaling, as shown in table 4; in the DCI signaling of the prior art, four fields are added, NDI occupies 1bit (bits), RV index occupies 2bits, a frequency domain resource allocation mode indication occupies 2bits, and a time domain resource allocation mode indication occupies 1 bit.

Table 4 DCI signaling

NDI	RV index	Frequency domain resource allocation mode indication	Time domain resource allocation mode indication
				1bit	2bits	2bits	1bit

Further, this step can be referred to as steps S21 and S22 shown in fig. 3, and is not described again.

And S32, the network equipment sends the data and the group identification to the terminal equipment, wherein the group identification is used for indicating the terminal equipment which can correctly acquire the data.

For example, this step may be referred to as step S23 shown in fig. 3, and is not described again.

And S33, acquiring the data sent by the network equipment by using the terminal equipment identified by the same group.

For example, this step may be referred to as step S24 shown in fig. 3, and is not described again.

In this embodiment, on the basis of the above embodiment, the network device indicates the frequency domain resource allocation manner and/or the time domain resource allocation manner through physical layer signaling or higher layer signaling.

Fig. 5 is a schematic block diagram of a network device according to an embodiment of the present application. The network device in the embodiment of the present application may be the network device in the above method embodiment, or may be one or more chips in the network device. The network device may be configured to perform some or all of the functions of the network device in the above-described method embodiments. The network device may include the following units and modules.

The communication module 51 is configured to send first indication information and second indication information to the terminal device, where the first indication information is used to indicate whether data to be transmitted is retransmission data, and the second indication information is used to indicate a version number of the data. At this time, the communication module 51 may perform step S11 of the method shown in fig. 2, or perform step S21 of the method shown in fig. 3.

The communication module 51 is further configured to send data and a group identifier to the terminal device, where the group identifier is used to indicate the terminal device that can correctly obtain the data. At this time, the communication module 51 may perform step S12 of the method shown in fig. 2, or perform step S23 of the method shown in fig. 3, or perform step S32 of the method shown in fig. 4.

The communication module 51 is specifically configured to: and sending signaling to the terminal equipment, wherein the signaling comprises first indication information and second indication information. At this time, the communication module 51 may perform step S31 of the method shown in fig. 4.

A communication module 51, further configured to: sending third indication information and/or fourth indication information to the terminal equipment, wherein the third indication information is used for indicating a frequency domain resource allocation mode, and the fourth indication information is used for indicating a time domain resource allocation mode; at this time, the communication module 51 may perform step S22 of the method shown in fig. 3. Or, the signaling further includes third indication information and/or fourth indication information; at this time, the communication module 51 may perform step S31 of the method shown in fig. 4.

Optionally, the frequency domain resource allocation manner and the time domain resource allocation manner may refer to the description of the above method embodiment, and are not described again.

The network device in the embodiment shown in fig. 5 may be configured to execute the technical solutions in the embodiments shown in fig. 2 to 4 in the above methods, and the implementation principles and technical effects are similar and will not be described herein again.

Fig. 6 is a schematic block diagram of a terminal device according to an embodiment of the present application. The terminal device of the embodiment of the present application may be the terminal device in the above method embodiment, or may be one or more chips in the terminal device. The terminal device may be configured to perform part or all of the functions of the terminal device in the above method embodiments. The terminal device may include the following units and modules.

The communication module 61 is configured to receive first indication information and second indication information sent by a network device, where the first indication information is used to indicate whether data to be transmitted is retransmission data, and the second indication information is used to indicate a version number of the data. At this time, the communication module 61 may perform step S11 of the method shown in fig. 2, or perform step S21 of the method shown in fig. 3.

The communication module 61 is further configured to receive data and a group identifier sent by the network device, where the group identifier is used to indicate a terminal device that can correctly obtain the data. At this time, the communication module 61 may perform step S12 of the method shown in fig. 2, or perform step S23 of the method shown in fig. 3, or perform step S32 of the method shown in fig. 4.

The communication module 61 is specifically configured to: and receiving signaling sent by the network equipment, wherein the signaling comprises first indication information and second indication information. At this time, the communication module 61 may perform step S31 of the method shown in fig. 4.

A communication module 61, further configured to: receiving third indication information and/or fourth indication information sent by the network equipment, wherein the third indication information is used for indicating a frequency domain resource allocation mode, and the fourth indication information is used for indicating a time domain resource allocation mode; at this time, the communication module 61 may perform step S22 of the method shown in fig. 3. Or, the signaling further includes third indication information and/or fourth indication information; at this time, the communication module 61 may perform step S31 of the method shown in fig. 4.

The terminal device in the embodiment shown in fig. 6 may be configured to execute the technical solutions in the embodiments shown in fig. 2 to 4 in the above methods, and the implementation principles and technical effects are similar, which are not described herein again.

Fig. 7 is a schematic block diagram of another network device provided in an embodiment of the present application, and as shown in fig. 7, the network device includes: a processor 171, a transmitter 172 and a receiver 173.

The transmitter 172 is configured to send first indication information and second indication information to the terminal device, where the first indication information is used to indicate whether the data to be transmitted is retransmission data, and the second indication information is used to indicate a version number of the data. At this time, the transmitter 172 may perform step S11 of the method shown in fig. 2, or perform step S21 of the method shown in fig. 3.

And a transmitter 172, configured to transmit the data and a group identifier to the terminal device, where the group identifier is used to indicate the terminal device that can correctly acquire the data. At this time, the transmitter 172 may perform step S12 of the method shown in fig. 2, or perform step S23 of the method shown in fig. 3, or perform step S32 of the method shown in fig. 4.

The transmitter 172 is specifically configured to: and sending signaling to the terminal equipment, wherein the signaling comprises first indication information and second indication information. At this time, the transmitter 172 may perform step S31 of the method shown in fig. 4.

A transmitter 172, further configured to: sending third indication information and/or fourth indication information to the terminal equipment, wherein the third indication information is used for indicating a frequency domain resource allocation mode, and the fourth indication information is used for indicating a time domain resource allocation mode; at this time, the transmitter 172 may perform step S22 of the method shown in fig. 3. Or, the signaling further includes third indication information and/or fourth indication information; at this time, the transmitter 172 may perform step S31 of the method shown in fig. 4.

Optionally, the frequency domain resource initial position indicated by the frequency domain resource allocation manner is G_RNTImod N_RBGWherein G is_RNTIIs a group identification, N_RBGTo schedule granularity.

Optionally, the frequency domain resource initial position indicated by the frequency domain resource allocation manner is

Optionally, the time domain resource allocation manner is that the network device transmits new data at the nth time granularity in the continuous downlink time granularities, and retransmits the data at the (n + j) th time granularity in the continuous downlink time granularities; wherein n and j are positive integers greater than or equal to 1.

Optionally, the time domain resource allocation manner is that the network device transmits new data at an nth time granularity and retransmits the data at an n + j + m time granularity, where the n + j time granularity to the n + j + m-1 time granularity are not downlink time granularity, and the n + j + m time granularity is downlink time granularity; n, j and m are positive integers of 1 or more.

Optionally, the time domain resource allocation manner is that the network device transmits new data at an nth time granularity and retransmits the data at an n + j time granularity, where the n + j time granularity is a downlink time granularity; n and j are positive integers of 1 or more.

Optionally, the time granularity is slot time slot, or the time granularity is mini slot small time slot.

The processor 171 may be configured to execute the processing procedure of the network device in the above-described method embodiment, or the program of each unit and module in the embodiment shown in fig. 5, and the processor 171 calls the program to execute the operation of the above method embodiment to implement each unit and module shown in fig. 5.

Optionally, the network device may also include a memory 174, the memory 174 for storing program codes and data for the network device.

In the embodiments of the present application, the above embodiments may be referred to and referred to by each other, and the same or similar steps and terms are not repeated.

The processor 171 may be a controller, and is shown as "controller/processor 171" in fig. 7. The transmitter 172 and the receiver 173 are used to support information transmission and reception between the network device and the terminal device in the above-described embodiments, and to support radio communication between the network device and other network devices. Optionally, the processor 171 performs various functions for communication with the terminal device.

In addition, network device may also include a communications interface 175. Communication interface 175 is used to support communication between the network device and other network entities.

The processor 171, for example, a Central Processing Unit (CPU), may also be one or more integrated circuits configured to implement the above methods, for example: one or more special integrated circuits, or one or more microprocessors, or one or more field programmable gate arrays, or the like. The memory 174 may be a single memory or a combination of a plurality of memory elements.

Fig. 8 is a schematic block diagram of another terminal device provided in an embodiment of the present application, and as shown in fig. 8, the terminal device includes: a processor 181, a transmitter 182, and a receiver 183.

The receiver 183 is configured to receive first indication information and second indication information sent by the network device, where the first indication information is used to indicate whether data to be transmitted is retransmission data, and the second indication information is used to indicate a version number of the data. At this time, the receiver 183 may perform step S11 of the method shown in fig. 2, or perform step S21 of the method shown in fig. 3.

The receiver 183 is further configured to receive data and a group identifier sent by the network device, where the group identifier is used to indicate a terminal device that can correctly acquire the data. At this time, the receiver 183 may perform step S12 of the method shown in fig. 2, or perform step S23 of the method shown in fig. 3, or perform step S32 of the method shown in fig. 4.

The receiver 183, in particular, is configured to: and receiving signaling sent by the network equipment, wherein the signaling comprises first indication information and second indication information. At this time, the receiver 183 may perform step S31 of the method shown in fig. 4.

A receiver 183, further for: receiving third indication information and/or fourth indication information sent by the network equipment, wherein the third indication information is used for indicating a frequency domain resource allocation mode, and the fourth indication information is used for indicating a time domain resource allocation mode; at this time, the receiver 183 may perform step S22 of the method shown in fig. 3. Or, the signaling further includes third indication information and/or fourth indication information; at this time, the receiver 183 may perform step S31 of the method shown in fig. 4.

The processor 181 may be configured to execute the processing procedure of the terminal device in the above-described method embodiment, or the program of each unit and module in the embodiment shown in fig. 6, and the processor 181 calls the program to execute the operation of the above method embodiment to implement each unit and module shown in fig. 6.

Optionally, the terminal device may further include a memory 184, the memory 184 being used to store program codes and data of the terminal device.

Optionally, the terminal device may also include a bus 185. Wherein the processor 181, the transmitter 182, the receiver 183, and the memory 184 may be connected to each other by a bus 185; the bus 185 may be a PCI bus or an EISA bus, etc. The bus 185 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. For ease of illustration, only one thick line is shown in FIG. 8, but this is not intended to represent only one bus or type of bus.

Alternatively, part or all of the above modules may be implemented by being embedded in a chip of the device in the form of an integrated circuit. And they may be implemented separately or integrated together. That is, the above modules may be configured as one or more integrated circuits implementing the above methods, for example: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), among others.

Embodiments of the present application also provide a computer-readable storage medium, which includes instructions, when the instructions are executed on a computer, the computer can execute the method provided in fig. 2-4.

An embodiment of the present application provides a communication system, which includes the terminal device provided in fig. 7 and the network device provided in fig. 8.

In the above embodiments, the implementation may be wholly or partially realized 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. The procedures or functions according to the embodiments of the present application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in the embodiments of the present application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

Claims

1. A data transmission method, applied to a network device, the method comprising:

sending first indication information and second indication information to terminal equipment, wherein the first indication information is used for indicating whether data to be transmitted is retransmission data, and the second indication information is used for indicating the version number of the data;

and sending the data and a group identifier to the terminal equipment, wherein the group identifier is used for indicating the terminal equipment which can correctly acquire the data.

2. The method of claim 1, wherein the sending the first indication information and the second indication information to the terminal device comprises:

and sending signaling to the terminal equipment, wherein the signaling comprises the first indication information and the second indication information.

3. The method of claim 2, further comprising: sending third indication information and/or fourth indication information to the terminal device, wherein the third indication information is used for indicating a frequency domain resource allocation mode, and the fourth indication information is used for indicating a time domain resource allocation mode;

or, the signaling further includes the third indication information and/or the fourth indication information.

4. The method of claim 3, wherein the frequency domain resource allocation is a non-frequency hopping resource allocation or the frequency domain resource allocation is a frequency hopping resource allocation.

5. The method according to claim 3 or 4, wherein the frequency domain resource allocation manner indicates the frequency domain resource starting position as G_RNTImod N_RBGWherein G is_RNTIIs the group identity, N_RBGTo schedule granularity.

6. The method according to claim 3 or 4, wherein the frequency domain resource allocation manner indicates the starting position of the frequency domain resource as

7. The method according to claim 3 or 4, wherein the frequency domain resource allocation manner indicates the starting position of the frequency domain resource as

8. The method according to any of claims 3-7, wherein the time domain resource allocation manner is such that the network device transmits new data at nth time granularity of consecutive downlink time granularities and retransmits data at n + j th of the consecutive downlink time granularities; wherein n and j are positive integers greater than or equal to 1.

9. The method according to any of claims 3-7, wherein the time domain resource allocation manner is that the network device transmits new data at an nth time granularity and retransmits the data at an n + j + m time granularity, wherein the n + j time granularity to the n + j + m-1 time granularity are not downlink time granularities, and the n + j + m time granularity is downlink time granularity; n, j and m are positive integers of 1 or more.

10. The method according to any of claims 3-7, wherein the time domain resource allocation manner is that the network device transmits new data at an nth time granularity and retransmits the data at an n + j time granularity, wherein the n + j time granularity is a downlink time granularity; n and j are positive integers of 1 or more.

11. The method according to any of claims 8-10, wherein the time granularity is a slot or the time granularity is a mini slot.

12. A data transmission method is applied to a terminal device, and the method comprises the following steps:

receiving first indication information and second indication information sent by network equipment, wherein the first indication information is used for indicating whether data to be transmitted is retransmission data, and the second indication information is used for indicating the version number of the data;

and receiving the data and the group identification sent by the network equipment, wherein the group identification is used for indicating the terminal equipment which can correctly acquire the data.

13. The method of claim 12, wherein the receiving the first indication information and the second indication information sent by the network device comprises:

14. The method of claim 13, further comprising: receiving third indication information and/or fourth indication information sent by the network device, wherein the third indication information is used for indicating a frequency domain resource allocation mode, and the fourth indication information is used for indicating a time domain resource allocation mode;

15. The method of claim 14, wherein the frequency domain resource allocation is a non-frequency hopping resource allocation or the frequency domain resource allocation is a frequency hopping resource allocation.

16. The method according to claim 14 or 15, wherein the frequency domain resource allocation manner indicates the frequency domain resource starting position as G_RNTImod N_RBGWherein G is_RNTIIs the group identity, N_RBGTo schedule granularity.

17. The method according to claim 14 or 15, wherein the frequency domain resource allocation manner indicates the starting position of the frequency domain resource as

18. The method according to claim 14 or 15, wherein the frequency domain resource allocation manner indicates the starting position of the frequency domain resource as

19. The method according to any of claims 14-18, wherein the time domain resource allocation manner is that the terminal device receives new data at nth time granularity in consecutive downlink time granularities, and receives retransmission data at n + j th time granularity in the consecutive downlink time granularities; wherein n and j are positive integers greater than or equal to 1.

20. The method according to any of claims 14-18, wherein the time domain resource allocation is such that the terminal device receives new data at an nth time granularity and receives retransmitted data at an n + j + m time granularity, where none of the n + j time granularity to the n + j + m-1 time granularity is a downlink time granularity, and the n + j + m time granularity is a downlink time granularity; n, j and m are positive integers of 1 or more.

21. The method according to any of claims 14-18, wherein the time domain resource allocation is such that the terminal device receives new data at an nth time granularity and receives retransmitted data at an n + j time granularity, wherein the n + j time granularity is a downlink time granularity; n and j are positive integers of 1 or more.

22. The method according to any of claims 19-21, wherein the time granularity is a slot or the time granularity is a mini slot.

23. A network device, comprising: a processor, a memory, a transmitter, and a receiver; the transmitter and the receiver are coupled to the processor, the processor controlling the transmitting action of the transmitter, the processor controlling the receiving action of the receiver;

wherein the memory is to store computer-executable program code, the program code comprising instructions; the instructions, when executed by the processor, cause the network device to perform the method of any of claims 1-11.

24. A terminal device, comprising: a processor, a memory, a transmitter, and a receiver; the transmitter and the receiver are coupled to the processor, the processor controlling the transmitting action of the transmitter, the processor controlling the receiving action of the receiver;

wherein the memory is to store computer-executable program code, the program code comprising instructions; the instructions, when executed by the processor, cause the terminal device to perform the method of any of claims 12-22.