CN111918333B

CN111918333B - Data transmission method and equipment

Info

Publication number: CN111918333B
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: 2023-10-24
Anticipated expiration: 2039-05-07
Also published as: CN111918333A

Abstract

The application provides a data transmission method and equipment, which can be applied to the fields of vehicle networking, such as V2X and the like, or intelligent driving, intelligent network networking and the like, wherein the method comprises the following steps: sending first indication information and second indication information to the terminal equipment, wherein the first indication information is used for indicating whether data to be transmitted are retransmission data or not, and the second indication information is used for indicating the version number of the data; and sending the data and the group identifier to the terminal equipment, wherein the group identifier is used for indicating the terminal equipment capable of correctly acquiring the data. The data transmission efficiency can be improved, and the problem of higher time delay of unicast transmission is solved; ensuring that data sent by the network device to the terminal device can be successfully received; the reliability of Uu port multicast or multicast transmission is effectively improved. In addition, the scheme provided by the embodiment can complete multicast or multicast repeated transmission based on SC-PTM.

Description

Data transmission method and equipment

Technical Field

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

Background

With the development of communication technology, various communication technologies are widely applied and developed. In the communication technology, processes such as data transmission are 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 by adopting multicast transmission or multicast transmission.

In the prior art, when data transmission is performed by adopting a multicast transmission or multicast transmission mode, a network device can transmit data to a plurality of terminal devices, thereby realizing multicast transmission or multicast transmission, and transmitting new data to each terminal device in the multicast transmission or multicast transmission process.

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, so that how to ensure that the data sent by the network device to the terminal device can be successfully received is a problem to be solved.

Disclosure of Invention

The application provides a data transmission method and device, which are used for solving the problem of how to ensure that data sent by network equipment to terminal equipment 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, 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 are 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 capable of correctly acquiring 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 device sends the group identifier to the terminal device, and the terminal device using the same group identifier can correctly receive the data sent by the network device. Therefore, the 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 data transmission efficiency can be improved, and the problem of higher time delay of unicast transmission is solved; in addition, as repeated transmission of data can be carried out 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. In addition, the scheme provided by the embodiment can complete multicast or multicast repeated transmission based on SC-PTM.

In one 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: transmitting 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; or, the signaling further includes the third indication information and/or the fourth indication information.

In one 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 starting position indicated by the frequency domain resource allocation manner is G _RNTI mod N _RBG Wherein G is _RNTI For the group identification, N _RBG For scheduling granularity.

In a possible implementation manner, the frequency domain indicated by the frequency domain resource allocation mannerThe resource initial position isWherein G is _RNTI For the group identification, N _RBG For the scheduling granularity, K is the maximum number of repeated transmissions, and i is a preset value.

In one possible implementation manner, the frequency domain resource starting position indicated by the frequency domain resource allocation manner is Wherein G is _RNTI For the group identification, N _RBG For scheduling 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 continuous downlink time granularity and retransmits data at an (n+j) th time granularity in the continuous downlink time granularity; 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 none of the n+j to n+j+m-1 time granularities is a downstream time granularity, and the n+j+m time granularity is a downstream time granularity; n, j and m 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 time granularity, where the n+j time granularity is a downlink time granularity; n and j are positive integers greater than or equal to 1.

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

In a second aspect, the present application provides a data transmission method, applied to a terminal device, where 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 are retransmission data or not, and the second indication information is used for indicating the version number of the data; and receiving the data and the group identifier sent by the network equipment, wherein the group identifier is used for indicating terminal equipment capable of correctly acquiring the data.

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

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

In one possible implementation manner, the frequency domain resource starting position indicated by the frequency domain resource allocation manner is Wherein G is _RNTI For the group identification, N _RBG For the scheduling granularity, K is the maximum number of repeated transmissions, and i is a preset value.

In one possible implementation manner, the frequency domain resource starting position indicated by the frequency domain resource allocation manner isWherein G is _RNTI For the group identification, N _RBG For scheduling granularity, i is a preset value.

In a possible implementation manner, the time domain resource allocation manner is that the terminal equipment receives new data at an nth time granularity in continuous downlink time granularity and receives retransmission data at an n+j th time granularity in the continuous downlink time granularity; 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 equipment receives new data at an nth time granularity and receives retransmission data at an n+j+mth time granularity, where no of the nth time granularity to the n+j+mth-1 time granularity is a downstream time granularity, and the n+j+mth time granularity is a downstream time granularity; n, j and m are positive integers greater than or equal to 1.

In a possible implementation manner, the time domain resource allocation manner is that the terminal equipment 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 greater than or equal to 1.

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: and 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 a transmitting action of the transmitter, the processor controlling a receiving action of the receiver;

wherein the memory is for storing 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 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.

And the transmitter is further used for transmitting the data and the group identifier to the terminal equipment, wherein the group identifier is used for indicating the terminal equipment capable of correctly acquiring the data.

In one possible implementation, 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: transmitting 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; or, the signaling further includes the third indication information and/or the fourth indication information.

In one possible implementation manner, the frequency domain resource starting position indicated by the frequency domain resource allocation manner isWherein G is _RNTI For the group identification, N _RBG For the scheduling granularity, K is the maximum number of repeated transmissions, and i is a preset value.

In a sixth aspect, the 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 application provides a program product for performing any implementation of the first aspect above when being executed by a processor.

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

In a ninth aspect, the present application provides a terminal device, including: a processor, a memory, a transmitter, and a receiver; the transmitter and the receiver are coupled to the processor, the processor controlling a transmitting action of the transmitter, the processor controlling a receiving action of the receiver; wherein the memory is for storing 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 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.

And the transmitter is further used for receiving the data and the group identifier sent by the network equipment, wherein the group identifier is used for indicating the terminal equipment capable of correctly acquiring the data.

In one possible implementation, 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 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; or, the signaling further includes the third indication information and/or the fourth indication information.

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

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

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

In a thirteenth aspect, the present application provides a communication system comprising: the terminal device provided in the fifth aspect and the network device provided in 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 yet 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 according to an embodiment of the present application;

fig. 8 is a schematic block diagram of another terminal device according to 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 (5 th-Generation, 5G) communication system, or other systems that may occur in the future, for example, the present application may be applied to a second Generation mobile communication technology (2 th-Generation, 2G) wireless communication system represented by a universal mobile telecommunication system (universal mobile telecommunications system, UMTS) system, a code division multiple access (code division multiple access, CDMA) system, a third Generation mobile communication technology (3 th-Generation, 3G) wireless communication system represented by wideband code division multiple access (wideband code division multiple access, WCDMA) system, a fourth Generation mobile communication technology (4 th-Generation, 4G) wireless communication system represented by long term evolution (long term evolution, LTE), a wireless local area network (wireless local area network, WLAN) or a future 5G wireless communication system, and the like. Some terms used in the present application are explained below to facilitate understanding by those skilled in the art. It should be noted that, when the solution according to the embodiment of the present application is applied to a 5G system or other systems that may occur in the future, names of network devices, terminal devices, and network devices may change, but this does not affect implementation of the solution according to the embodiment of the present application.

1) A terminal device, also called a terminal, user device, is a device that provides voice and/or data connectivity to a user, e.g., a handheld device, an in-vehicle device, etc., with wireless connectivity. Common terminal devices include, for example: a mobile phone, tablet, notebook, palmtop, mobile internet device (mobile internet device, MID), wearable device, wherein the wearable device for example comprises: smart watches, smart bracelets, pedometers, etc.

2) A network device, also known as a radio access network (radio access network, RAN) device, is a device that accesses terminal devices to a wireless network over licensed and unlicensed spectrum, including network devices in various communication schemes, including, for example, 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 (radio network controller, RNC), a Node B (Node B, NB), a network device controller (base station controller, BSC), a network device transceiver station (base transceiver station, BTS), a Home network device (e.g., home evolved NodeB, or Home Node B, HNB), a baseband unit (BBU), and the like. Wherein the base stations include, but are not limited to: enhanced NodeB (enhancedNodeB, eNB) defined in long term evolution (long term evolution, LTE), next generation NodeB (gNB) defined in new air interface (NR).

3) Multicast transmission: at least including transmission over a physical layer multicast channel (physical multicast channel, PMCH) and transmission over a physical downlink shared channel (physical downlink shared channel, PDSCH).

4) "plurality" means two or more, and the like. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

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

The services supported by the wireless communication system also progress from the original voice and short messages to the current support of wireless high-speed data communication. Moreover, the number of wireless connections worldwide is experiencing a continuously high growth, and various new wireless service types are also emerging in large numbers, such as internet of things, autopilot, etc., which all put higher demands on the next generation wireless communication system, i.e. NR.

The manner in which resources are allocated during transmission and the communication procedure between the devices will be described below by way of example of NR-vehicle user equipments (vehicle to everything, V2X).

In NR-V2X, two air ports are defined. The first is a terrestrial radio access network and user equipment (UTRAN UE, uu) port defining a communication protocol between a terminal device and a network device; the Uu port defines an uplink and downlink transmission protocol similar to that in NR, and the uplink and downlink transmission protocol of NR is basically used in the aspects of frequency band allocation, bandwidth, frame structure, transmission mode, signaling definition and the like, and a plurality of special signaling for V2X are added on the basis. The second is a near field communication (proximity communication, PC 5) port, the PC5 port defining 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 is possible to consider multiplexing the uplink frequency band of NR, and also possible to employ unlicensed frequency band; the PC5 port adopts a special frame structure and pilot design; and, in terms of beam management and multiple-input and multiple-output (MIMO) aspects, the beam management and MIMO aspects are simplified based on the design and principles of NR.

The PC5 port defines two ways of resource allocation during transmission. A resource allocation, a network device dynamically allocates transmission resources in real time, where the transmission resources are transmission resources of a terminal device on a side uplink (Sidelink) interface. Another resource allocation, the network device pre-configures a transmission resource pool, wherein the transmission resource pool is a transmission resource pool on a side uplink (Sidelink) interface of the terminal device, and then, different terminal devices use specific resources in the transmission resource pool; the terminal devices negotiate to allocate resources in the transmission resource pool when the terminal devices use the resources in the transmission resource pool.

For example, in NR-V2X transmission, highway (highway) and city (uban) scenes may be involved. In the expressway scene, since no crossroad exists on the expressway field, the traveling directions of vehicles are only two; in the urban scene, since an intersection is set in the city, there are four possibilities of the traveling direction of the vehicle, at which time the vehicle serves as the above-described terminal device. In the running process of the vehicle, 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; the vehicles in different directions can obtain the high-definition map and the real-time road condition by any one of unicast, multicast and multicast (different groups) modes due to different required high-definition maps and road condition information.

In various wireless communication systems, the following data transmission methods can be employed.

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

The first transmission mode is implemented through SC-PTM in a single transmission process, i.e. the network device can only send new data to the terminal device; in addition, in the above process, the terminal device receives more 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 easy to obtain erroneous data.

And a second transmission mode. The unicast transmission mechanism can be implemented through PDSCH, and this method can be applied to LTE communication systems and NR communication systems, for example. The network device indicates an identity of the terminal device based on the cell radio network temporary identity (cell radio network temporary identifier, C-RNTI); then, the network device sends data to the terminal device; then, all terminal devices indicated as C-RNTI receive data through the PDSCH, and the terminal devices demodulate the PDSCH to obtain data.

The second transmission mode is realized by unicast transmission, and when the network equipment transmits the same data to the plurality of terminal equipment, the network equipment needs to transmit the same data for a plurality of times, namely, the network equipment needs to sequentially transmit the same data to each of the plurality of terminal equipment; thereby causing a high delay, for example, a reception delay of a terminal device which receives data later is high; i.e. time-efficient. 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 size of the data is large, a transmission delay is high.

From the above description, it is known that unicast transmission can be achieved, but unicast transmission is inefficient.

The network device may send data to the terminal device in a multicast transmission or a multicast transmission. However, when the 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 occur and may not be received by the terminal device. Thus, there is a need to provide a way to ensure that data sent by a network device to a terminal device can be successfully received in a multicast transmission or a 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 equipment sends first indication information and second indication information to the terminal equipment, wherein the first indication information is used for indicating whether data to be transmitted are retransmission data or not, and the second indication information is used for indicating the version number of the data.

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

The network device may illustratively be in communication with a plurality of terminal devices. In order to implement multicast or a procedure of repeating transmission in multicast, the network device needs to transmit the first indication information and the second indication information to each terminal device.

The first indication information may indicate whether the data to be transmitted by the network device is retransmission data. Optionally, when the first indication information is the first information, the first indication information characterizes data to be transmitted by the network device, not retransmitted data, that is, characterizes that the data to be transmitted by the network device is new data; when the first indication information is the second information, the first indication information characterizes the data to be transmitted by the network equipment and 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 indication (new data indicator, NDI).

The second indication information may indicate data to be transmitted by the network device, and a version number corresponding to the data; the version number is the version number of the new data or the version number of the retransmission data. Optionally, the second indication information uses different third information to characterize different version numbers; for example, when the third information is content 1, the second indicating information indicates that the version number of the data is one version number, when the third information is content 2, the second indicating information indicates that the version number of the data is another version number, and so on. 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.

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

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

The DCI signaling is described as an example. The network equipment sends DCI signaling to the terminal equipment through a physical downlink control channel (physical downlink control channel, PDCCH), wherein the DCI signaling carries the first indication information and the second indication information; optionally, the first indication information is NDI, and the second indication information is 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 new data. When the second indication information is a number other than 0, the second indication information indicates that the number other than 0 is a 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 a version number of the retransmission data; and so on.

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 the format of the DCI signaling of the prior art.

For example, two fields may be added to 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 DCI signaling in the prior art, NDI occupies 1 bit (bits), RV index occupies 2bits.

TABLE 1 DCI Signaling

NDI	RV index
		1bit	2bits

And S12, the network equipment sends data and a group identifier to the terminal equipment, wherein the group identifier is used for indicating the terminal equipment capable of correctly acquiring the data.

Illustratively, 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 transmitted to the terminal device together with the first indication information and the second indication information in step S11, i.e., the network device transmits 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. The data is the data to be transmitted in step S11; the group identifier indicates at least one terminal device, each of the at least one terminal device may correctly receive data transmitted by the network device, and other terminal devices may not correctly receive data transmitted by the network device. And, because the network device sends the group identifier, the transmission process of the network device sending the data to the terminal device is indicated, which is multicast or multicast.

In the present application, the specific format and content of the group identifier are not limited. Optionally, group identities including but not limited to G-RNTI, radio network temporary identities (radio network temporary identifier, RNTI).

Optionally, after step S12, the method further includes:

s13, using the terminal equipment with the same group identifier to acquire data sent by the network equipment.

Illustratively, since the terminal device using the group identifier described above in step S12, the data transmitted by the network device can be correctly received.

The terminal device may detect the group identity transmitted by the network device, where the group identity is the group identity transmitted by the network device in step S12. For example, when the network device transmits a group identifier to the terminal device through the PDCCH, the terminal device may detect the group identifier included in the PDCCH.

Then, the terminal equipment is known about own group identification in advance; the terminal equipment can judge whether the group identifier contained in the PDSCH is consistent with the group identifier obtained in advance; if so, the terminal device determines that the terminal device belongs to the group indicated by the group identifier contained in the PDSCH. The terminal device may then receive the complete data on the PDSCH, which is the data sent by the network device in step S12.

Then, the terminal device can 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 equipment receives complete data on the PDSCH, and the terminal equipment does not combine the historically received data; 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 equipment receives complete data on the PDSCH, and the terminal equipment combines the data received in history with the data received currently; the terminal device then demodulates the combined data.

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

In this embodiment, 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; the network device sends data and a group identifier to the terminal device, wherein the group identifier is used for indicating the terminal device capable of correctly acquiring 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 device sends the group identifier to the terminal device, and the terminal device using the same group identifier can correctly receive the data sent by the network device. Therefore, the 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 data transmission efficiency can be improved, and the problem of higher time delay of unicast transmission is solved; in addition, as repeated transmission of data can be carried out 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. In addition, the scheme provided by the embodiment can complete multicast or multicast repeated 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 equipment sends first indication information and second indication information to the terminal equipment, wherein the first indication information is used for indicating whether data to be transmitted are retransmission data or not, and the second indication information is used for indicating the version number of the data.

For example, this step may refer to step S11 shown in fig. 2, and will not be described in detail.

S22, the network equipment sends 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.

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

Optionally, the frequency domain resource allocation method includes the following implementation methods:

a first implementation of the frequency domain resource allocation scheme: the initial position of the frequency domain resource indicated by the frequency domain resource allocation mode is G _RNTI mod N _RBG Wherein G is _RNTI For group identification, N _RBG For scheduling granularity.

A second implementation of the frequency domain resource allocation scheme: the starting position of the frequency domain resource indicated by the frequency domain resource allocation mode is Wherein G is _RNTI For group identification, N _RBG For the scheduling granularity, K is the maximum number of repeated transmissions, and i is a preset value.

Third implementation of the frequency domain resource allocation method: the starting position of the frequency domain resource indicated by the frequency domain resource allocation mode isWherein G is _RNTI For group identification, N _RBG For scheduling granularity, i is a preset value.

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

a first implementation of a time domain resource allocation scheme: the network device transmits new data at an nth time granularity in the continuous downlink time granularity and retransmits the data at an 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 of the time domain resource allocation scheme: the network equipment transmits new data on the nth time granularity and retransmits the data on the n+j+m time granularity, wherein the nth time granularity is not the downlink time granularity from the nth time granularity to the nth time granularity of j+m-1, and the nth time granularity is the downlink time granularity; n, j and m are positive integers greater than or equal to 1.

Third implementation of the time domain resource allocation scheme: 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 the downlink time granularity; n and j are positive integers greater than or equal to 1.

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 mode is a frequency domain resource allocation mode based on SC-PTM, and the time domain resource allocation mode is a time domain resource allocation mode based on SC-PTM.

For example, 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 multicast or multicast transmission is performed; 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 multicast or multicast transmission is performed; or, 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 characterize different frequency domain resource allocation modes; the fourth indication information uses different bit information to characterize different time domain resource allocation modes.

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

Table 2 third indication information

Bit information	Indicating content
		00	Frequency domain resource allocation mode one
01	Frequency domain resource allocation mode II
		10	Frequency domain resource allocation mode III
11	Reservation of

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

Table 3 fourth indication information

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

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

A first implementation of the frequency domain resource allocation scheme. The network device may employ equation G _RNTI mod N _RBG Determining the initial position of the allocated frequency domain resource, namely G _RNTI mod N _RBG The method comprises the steps of carrying out a first treatment on the surface of the At this time, G _RNTI Is a group identification; n (N) _RBG For scheduling granularity, the scheduling granularity refers to the number of Resource Blocks (RBs) contained in a subband when the network device schedules a frequency domain resource; k is the most repeated transmission The number of times i is a preset value; wherein the group identity may employ other identities, e.g. when the group identity is G-RNTI, the group identity may employ G _G-RNTI A representation; when the group identifier is RNTI, the group identifier can adopt G _RNTI A representation; the frequency domain resource allocation method in this case is a non-hopping frequency domain resource allocation method.

A second implementation of the frequency domain resource allocation scheme. The network device may employ the formula Determining the starting position of the allocated frequency domain resource, i.e. the starting position of the frequency domain resource is +.>At this time, the meaning of the letters in the formula may be referred to above, where i is a preset value, or i may be another value, for example, i is a version number of the data, where i is a version number of the data, and the version number of the data needs to be smaller than K; likewise, other identities may be used for group identity, e.g. when the group identity is G-RNTI, the group identity may be G _G-RNTI A representation; when the group identifier is RNTI, the group identifier can adopt G _RNTI A representation; the frequency domain resource allocation method in this case is a frequency domain resource allocation method for frequency hopping.

A third implementation of the frequency domain resource allocation scheme. The network device may employ the formula Determining the starting position of the allocated frequency domain resource, i.e. the starting position of the frequency domain resource is +.>At this time, the meaning of the letters in the formula may be referred to as the description of the second implementation of the above-mentioned frequency domain resource allocation method. The frequency domain resource allocation method in this case is a frequency domain resource allocation method for frequency hopping.

In any implementation manner of the above 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 the resource positions of the terminal devices belonging to different group identifiers, so as to reduce the possibility that the terminal devices belonging to different group identifiers use the same resource.

Then, after the network device adopts any implementation mode of the frequency domain resource allocation mode to determine the starting position of the frequency domain resource, the network device determines the frequency domain resource according to the starting position of the frequency domain resource. Then, in step S23, the network device may send data to the terminal device according to the frequency domain resource; then, in step S24, using the same terminal device with the group identifier, a frequency domain resource allocation manner may be determined 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; the third indication information is bit information 01, and indicates a frequency domain resource allocation mode, which is a second implementation mode of the frequency domain resource allocation mode; and if the third indication information is bit information 10, the third indication information indicates a frequency domain resource allocation mode, and is a third implementation mode of the frequency domain resource allocation mode.

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

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

A first implementation of the time domain resource allocation scheme. When the time granularity is slots, if continuous downlink slots exist, if the network device sends new data to the terminal device on the nth slot, the network device can send retransmission data to the terminal device on n+j slots in the continuous downlink slots. 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 on the nth slot; then, the terminal or the device receives and demodulates the new data; because there is a continuous downlink slot, the n+j-th slot is a downlink slot, and the terminal device receives retransmission data sent by the network device on the n+j-th slot in the continuous downlink slot; then, the terminal equipment combines the data received on the nth slot with the data received on the (n+j) th slot to obtain combined data; the terminal device then demodulates the combined data.

When the time granularity is min slots, if continuous downlink min slots exist, if the network device sends new data to the terminal device on the nth min slot, the network device can send retransmission data to the terminal device on n+j min slots in the continuous downlink 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 the device receives and demodulates the new data; because there is a continuous downlink min slot, the n+j-th min slot is a downlink min slot, and the terminal device receives retransmission data sent by the network device on the n+j-th min slot in the continuous downlink min slots; then, the terminal equipment combines the data received on the nth min slot with the data received on the n+j min slot to obtain combined data; the terminal device then demodulates the combined data.

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

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

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

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

In the frequency domain resource allocation mode, j can be valued from 1; the value of n is determined by the network device, e.g., the value of n is configured by the network device through higher layer signaling.

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

The embodiment of the present application is not limited to the execution order of step S21 and step S22, and may be to execute step S21 first and then execute step S22; step S22 may be performed first, and step S21 may be performed later; step S21 and step S22 may be performed simultaneously.

S23, the network equipment sends data and a group identifier to the terminal equipment, wherein the group identifier is used for indicating the terminal equipment capable of correctly acquiring the data.

For example, the step may refer to step S12 shown in fig. 2 and step S22 of the present embodiment, which are not described herein.

And, based on the 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 adopting a frequency domain resource allocation manner indicated by the third indication information and a preset time domain resource allocation manner in the prior art; therefore, the terminal equipment receives the data sent by the network equipment 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 equipment sends fourth indication information to the terminal equipment, the network equipment adopts a time domain resource allocation mode indicated by the fourth indication information and a preset frequency domain resource allocation mode in the prior art to send data to the terminal equipment; therefore, the terminal equipment receives the data sent by the network equipment by adopting 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 adopts 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 to send data to the terminal equipment; therefore, the terminal equipment receives the data sent by the network equipment by adopting 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.

S24, using the same terminal equipment with the group identifier to acquire the data sent by the network equipment.

For example, the step may refer to step S13 shown in fig. 2 and step S22 of the present embodiment, which are not described in detail.

In this embodiment, based on 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 a frequency domain resource allocation manner, and the fourth indication information is used to indicate a time domain resource allocation manner. Therefore, the network equipment can send data to the terminal equipment through 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 the terminal devices belonging to different group identifiers, and the possibility that the terminal devices belonging to different group identifiers use the same block of resources is reduced.

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 equipment sends signaling to the terminal equipment, wherein the signaling comprises first indication information and second indication information, the signaling also comprises third indication information and/or fourth indication information, the first indication information is used for indicating whether data to be transmitted are retransmission data, the second indication information is used for indicating the version number of the data, the third indication information is used for indicating the frequency domain resource allocation mode, and the fourth indication information is used for indicating the time domain resource allocation mode.

Illustratively, the network device sends the first indication information and the second indication information to the terminal device and sends the third indication information and/or the fourth indication information by using any signaling of RRC signaling, MAC-CE signaling, DCI signaling, and other higher layer signaling. Namely, 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 described as an example. And the network equipment sends DCI signaling to the terminal equipment through the PDCCH. The DCI signaling carries the first indication information and the second indication information; optionally, the first indication information is NDI, and the second indication information is RV index. And, the third indication information and/or the fourth indication information are carried in the DCI signaling.

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

TABLE 4 DCI Signaling

NDI	RV index	Indication of frequency domain resource allocation mode	Time domain resource allocation mode indication
				1bit	2bits	2bits	1bit

In addition, this step may refer to steps S21 and S22 shown in fig. 3, and will not be described again.

And S32, the network equipment sends data and a group identifier to the terminal equipment, wherein the group identifier is used for indicating the terminal equipment capable of correctly acquiring the data.

For example, this step may refer to step S23 shown in fig. 3, and will not be described in detail.

S33, using the same terminal equipment with the group identifier to acquire the data sent by the network equipment.

For example, this step may refer to step S24 shown in fig. 3, and will not be described in detail.

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

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 embodiment of the method, 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 method embodiments described above. 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 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 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.

The communication module 51 is further configured to: transmitting 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 also comprises 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.

Alternatively, the frequency domain resource allocation manner and the time domain resource allocation manner may be referred to the description of the above method embodiment, and will not be repeated.

The network device of the embodiment shown in fig. 5 may be used to implement the technical solutions of the embodiments shown in fig. 2 to 4 in the above-mentioned method, and the implementation principle and technical effects are similar, and are not repeated here.

Fig. 6 is a schematic block diagram of a terminal device according to an embodiment of the present application. The terminal device in the embodiment of the present application may be the terminal device in the embodiment of the method, 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-described 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 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 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 acquire 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.

The communication module 61 is 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 also comprises 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 of the embodiment shown in fig. 6 may be used to implement the technical solutions of the embodiments shown in fig. 2 to 4 in the above-mentioned method, and the implementation principle and technical effects are similar, and are not repeated here.

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

And a transmitter 172 configured to transmit, to the terminal device, first indication information for indicating whether the data to be transmitted is retransmission data and second indication information for indicating 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.

The transmitter 172 is further configured to transmit 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.

Transmitter 172, further for: transmitting 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 also comprises 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 starting position indicated by the frequency domain resource allocation mode is G _RNTI mod N _RBG Wherein G is _RNTI For group identification, N _RBG For scheduling granularity.

Optionally, the frequency domain resource starting position indicated by the frequency domain resource allocation mode is Wherein G is _RNTI For group identification, N _RBG For the scheduling granularity, K is the maximum number of repeated transmissions, and i is a preset value.

Optionally, the frequency domain resource starting position indicated by the frequency domain resource allocation mode isWherein G is _RNTI For group identification, N _RBG To dispatch particlesGranularity, i, is a preset value.

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

Optionally, the time domain resource allocation mode is that the network device 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 are downlink time granularity; n, j and m are positive integers greater than or equal to 1.

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

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

The processor 171 may be used to perform the processing procedure of the network device in the above method embodiment, or the program of each unit and module of the embodiment shown in fig. 5, and the processor 171 calls the program to perform 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 foregoing embodiments may be referred to and referred to each other, and the same or similar steps and terms are not repeated herein.

The processor 171 may also be a controller, which is denoted as "controller/processor 171" in fig. 7. The transmitter 172 and the receiver 173 are used to support the transceiving of information between the network device and the terminal device in the above embodiment, and to support the radio communication between the network device and other network devices. In the alternative, processor 171 performs various functions for communicating with terminal devices.

In addition, the network device may also include a communication interface 175. The communication interface 175 is used to support the network device in communicating with other network entities.

The processor 171, e.g., a central processing unit (central processing unit, CPU), may also be one or more integrated circuits configured to implement the above methods, e.g.: one or more specific integrated circuits, or one or more microprocessors, or one or more field programmable gate arrays, etc. The memory 174 may be one memory or may be a collective term for a plurality of memory elements.

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

And a receiver 183, 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 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 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 sent by the network device and a group identifier, 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 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 receiver 183 may perform step S31 of the method shown in fig. 4.

Receiver 183, also 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 also comprises 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.

Optionally, the frequency domain resource starting position indicated by the frequency domain resource allocation mode isWherein G is _RNTI For group identification, N _RBG For scheduling granularity, i is a preset value.

The processor 181 may be used to perform the processing procedure of the terminal device in the above method embodiment, or the program of each unit and module in the embodiment shown in fig. 6, and the processor 181 invokes the program to perform the operation of the above method embodiment to implement each unit and module shown in fig. 6.

Optionally, the terminal device may further comprise a memory 184, the memory 184 being for storing program codes and data of the terminal device.

Optionally, the terminal device may also include a bus 185. Wherein the processor 181, transmitter 182, receiver 183, and memory 184 may be interconnected by a bus 185; bus 185 may be a PCI bus, an EISA bus, or the like. The bus 185 may be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus, or an extended industry standard architecture (extended industry standard architecture, EISA) bus, among others. For ease of illustration, only one thick line is shown in fig. 8, but not only one bus or one type of bus.

Alternatively, part or all of the above modules may be implemented in the form of an integrated circuit embedded in a chip of the device. 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 specific integrated circuits (Application Specific Integrated Circuit, ASIC), or one or more microprocessors (digital singnal processor, DSP), or one or more field programmable gate arrays (Field Programmable Gate Array, FPGA), or the like.

Embodiments of the present application also provide a computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the methods provided in fig. 2-4.

The embodiment of the application provides a communication system, which comprises the terminal equipment provided by fig. 7 and the network equipment provided by fig. 8.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, fiber optic, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means from one website, computer, server, or data center. Computer readable storage media can be any available media that can be accessed by a computer or data storage devices, such as servers, data centers, etc., that contain an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy Disk, a hard Disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

Those skilled in the art will appreciate 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, these 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 are retransmission data or not, and the second indication information is used for indicating the version number of the data;

transmitting the data and a group identifier to the terminal equipment, wherein the group identifier is used for indicating the terminal equipment capable of correctly acquiring the data;

The sending the first indication information and the second indication information to the terminal equipment comprises the following steps:

transmitting signaling to the terminal equipment, wherein the signaling comprises the first indication information and the second indication information;

further comprises: transmitting 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;

or the signaling also comprises the third indication information and/or the fourth indication information

The initial position of the frequency domain resource indicated by the frequency domain resource allocation mode is G _RNTI mod N _RBG Wherein G is _RNTI For the group identification, N _RBG For scheduling granularity.

2. The method of claim 1, wherein the frequency domain resource allocation is a non-hopping resource allocation or the frequency domain resource allocation is a hopping resource allocation.

3. The method according to claim 1 or 2, wherein the frequency domain resource starting position indicated by the frequency domain resource allocation manner isWherein G is _RNTI For the group identification, N _RBG For the scheduling granularity, K is the maximum number of repeated transmissions, and i is a preset value.

4. The method according to claim 1 or 2, wherein the frequency domain resource starting position indicated by the frequency domain resource allocation manner isWherein G is _RNTI For the group identification, N _RBG For scheduling granularity, i is a preset value.

5. The method according to any of claims 1-4, wherein the time domain resource allocation is such that the network device transmits new data at an nth time granularity of consecutive downlink time granularities and retransmits data at an n+j th of the consecutive downlink time granularities; wherein n and j are positive integers greater than or equal to 1.

6. The method according to any one of claims 1-4, 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+mth time granularity, where none of the n+j to n+j+mth-1 time granularities is a downstream time granularity, and the n+j+mth time granularity is a downstream time granularity; n, j and m are positive integers greater than or equal to 1.

7. The method according to any one of claims 1-4, wherein the time domain resource allocation manner is that the network device transmits new data at an nth time granularity and retransmits data at an n+jth time granularity, where the n+jth time granularity is a downstream time granularity; n and j are positive integers greater than or equal to 1.

8. The method according to any of claims 5-7, wherein the time granularity is slot time slots or the time granularity is mini slot minislots.

9. A data transmission method, applied to a terminal device, the method comprising:

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 are retransmission data or not, and the second indication information is used for indicating the version number of the data;

receiving the data and a group identifier sent by the network equipment, wherein the group identifier is used for indicating terminal equipment capable of correctly acquiring the data;

the receiving the first indication information and the second indication information sent by the network equipment includes:

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

further comprises: 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;

Or the signaling also comprises the third indication information and/or the fourth indication information;

10. The method of claim 9, wherein the frequency domain resource allocation is a non-hopping resource allocation or the frequency domain resource allocation is a hopping resource allocation.

11. The method according to claim 9 or 10, wherein the frequency domain resource starting position indicated by the frequency domain resource allocation manner isWherein G is _RNTI For the group identification, N _RBG For the scheduling granularity, K is the maximum number of repeated transmissions, and i is a preset value.

12. The method according to claim 9 or 10, wherein the frequency domain resource starting position indicated by the frequency domain resource allocation manner isWherein G is _RNTI For the group identification, N _RBG For scheduling granularity, i is a preset value.

13. The method according to any of claims 9-12, wherein the time domain resource allocation is such that the terminal device receives new data at an nth one of the consecutive downlink time granularity and receives retransmission data at an n+j-th one of the consecutive downlink time granularity; wherein n and j are positive integers greater than or equal to 1.

14. The method according to any one of claims 9-12, wherein 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+mth time granularity, where none of the n+j to n+j+mth-1 time granularities is a downstream time granularity, and the n+j+mth time granularity is a downstream time granularity; n, j and m are positive integers greater than or equal to 1.

15. The method according to any one of claims 9-12, wherein 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+jth time granularity, where the n+jth time granularity is a downstream time granularity; n and j are positive integers greater than or equal to 1.

16. The method according to any of claims 13-15, wherein the time granularity is slot time slots or the time granularity is mini slot small time slots.

17. 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 a transmitting action of the transmitter, the processor controlling a receiving action of the receiver;

Wherein the memory is for storing 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 1-8.

18. 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 a transmitting action of the transmitter, the processor controlling a receiving action of the receiver;

wherein the memory is for storing 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 9-16.