WO2017054173A1

WO2017054173A1 - Data transmission method, base station and terminal

Info

Publication number: WO2017054173A1
Application number: PCT/CN2015/091225
Authority: WO
Inventors: 张弛; 郭房富; 古磊
Original assignee: 华为技术有限公司
Priority date: 2015-09-30
Filing date: 2015-09-30
Publication date: 2017-04-06
Also published as: CN108141324A

Abstract

Disclosed in present invention are a data transmission method, base station and terminal, relating to the field of communication and used for solving the problem of low data retransmission efficiency in prior D2D communication. The method comprises: a first terminal, on the basis of a first transmission attribute, transmitting service data to a second terminal in a first hybrid automatic retransmission request (HARQ) progress; the first terminal obtaining downlink control information when monitoring the downlink control information transmitted by the base station in the first HARQ progress, wherein the downlink control information is used for indicating a second transmission attribute of the service data; the first terminal, on the basis of the second transmission attribute, retransmitting the service data to the second terminal in the first HARQ progress, wherein the transmission attribute comprises at least one of the following information: resources occupied by the service data and data format of the service data. Embodiments of the present invention are used for data retransmission in D2D communication.

Description

Data transmission method, base station and terminal

Technical field

The present invention relates to the field of communications, and in particular, to a data transmission method, a base station, and a terminal.

Background technique

The device-to-device (English name: Device-to-Device, D2D for short) communication refers to the technology of direct communication between terminals at close range without the help of a third party. Thus, the terminal at the edge of the network coverage can pass D2D communication technology. Communicating with terminals that are close to and outside the network coverage is equivalent to extending the coverage of the network. In the scenario of no network coverage, short-distance terminals can interact with each other through D2D communication technology, which avoids the complete interruption of communication caused by the network.

For D2D communication, the pre-configured transmission attributes, such as the resources occupied by the data and the data format, can be used between the terminals of the D2D communication. Thus, after the initial data is transmitted, the source terminal directly determines when data retransmission is required. The data is retransmitted according to the pre-configured transmission attributes, but the pre-configured resources and data formats may not be suitable for each data retransmission. Therefore, the destination terminal may still not receive correctly for the service data retransmitted by the source terminal. , resulting in inefficient data retransmission.

Summary of the invention

The embodiments of the present invention provide a data transmission method, a base station, and a terminal, which are used to solve the technical problem of inefficient data retransmission in the existing D2D communication.

In order to achieve the above object, the present invention adopts the following technical solutions:

In a first aspect, a data transmission method is provided, including:

Transmitting, by the first terminal, the service data to the second terminal in a first hybrid automatic repeat request (HARQ) process according to the first transmission attribute;

The first terminal acquires the downlink control information when the downlink control information sent by the base station is received by the first terminal in the first HARQ process, where the downlink control information is used to indicate the industry The second transmission attribute of the data;

Retransmitting, by the first terminal, the service data to the second terminal in the first HARQ process according to the second transmission attribute;

The transmission attribute includes at least one of the following information: a resource occupied by the service data, and a data format of the service data.

With the above solution, the first terminal may adjust the transmission attribute of the service data according to the downlink control information sent by the base station, and make the resource or data format occupied by the service data, before retransmitting the service data to the second terminal. It is suitable for the current transmission environment, thereby facilitating the correct reception of the second terminal, and improving the efficiency of data retransmission.

In conjunction with the first possible implementation of the first aspect, the first terminal monitors the downlink control information in a first subframe of the first HARQ process;

If the first transmission attribute is different from the second transmission attribute, the first terminal retransmits the service data to the second terminal in the first HARQ process according to the second transmission attribute, including :

Retransmitting, by the first terminal, the service data to the second terminal in a second subframe of the first HARQ process according to the second transmission attribute;

The first subframe and the second subframe are uplink subframes in the first HARQ process, and the first subframe and the second subframe are separated by at least one processing delay. The processing delay indicates a duration required by the first terminal to parse the downlink control information.

With reference to the first aspect, or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the first terminal is in a first subframe of the first HARQ process The one-time domain resource listens to the downlink control information; the first subframe includes multiple time domain resources;

If the first transmission attribute is the same as the second transmission attribute, the first terminal retransmits the service data to the second terminal in the first HARQ process according to the second transmission attribute, including :

The first terminal retransmits the service data in a second time domain resource of the first subframe according to the second transmission attribute.

After the first terminal receives the downlink control information sent by the base station in the first time domain resource of the first subframe, if the second transmission attribute indicated by the downlink control information is the first The first transmission attribute is suitable for the current transmission environment, so that the first terminal may be in the first The second time domain resource of a subframe directly performs data retransmission without a processing delay, thereby improving the efficiency of data retransmission.

With reference to the first possible implementation of the first aspect to the second possible implementation of the first aspect, in a third possible implementation manner of the first aspect, the method further includes:

The first terminal receives non-acknowledgment (NACK) information sent by the second terminal in the first HARQ process, where the NACK information is used to indicate that the second terminal does not correctly receive the service data.

With reference to the first aspect to the possible implementation of the third possible implementation of the first aspect, in a fourth possible implementation of the first aspect, the method further includes:

When the first terminal does not listen to the downlink control information sent by the base station in the first time domain resource of the first subframe of the first HARQ process, according to the first transmission attribute, The second time domain resource of one subframe retransmits the service data to the second terminal.

In the above solution, the first terminal receives the NACK information sent by the second terminal, so that the first terminal does not need to notify the base station to determine that the second terminal does not correctly receive data. After the first time domain resource of the first subframe of the first HARQ process sends downlink control information, the first terminal may keep the transmission attribute of the service data unchanged, in the second of the first subframe. Time domain resources directly perform data retransmission without a processing delay, which improves the efficiency of data retransmission.

In a second aspect, another data transmission method is provided, including:

The second terminal sends non-acknowledgement (NACK) information to the first HARQ process when the second terminal does not correctly receive the service data sent by the first terminal according to the first transmission attribute in the first hybrid automatic repeat request (HARQ) process. a base station, where the NACK information is used to indicate that the second terminal does not correctly receive the service data;

Receiving, by the second terminal, the service data that is retransmitted by the first terminal according to the second transmission attribute in the first HARQ process, where the second transmission attribute is that the first terminal is according to the base station Determining downlink control information sent in the first HARQ process;

In combination with the first possible implementation of the second aspect, the method further includes:

The second terminal receives the downlink control information that is sent by the base station in the first HARQ process, and the downlink control information is used to indicate a second transmission attribute of the service data.

According to the foregoing solution, the second terminal may determine, according to the second transmission attribute indicated by the downlink control information, which subframe of the first HARQ process is to perform data retransmission, The second terminal only needs to listen to the subframe to obtain the service data retransmitted by the first terminal, and does not need to perform blind detection on each subframe of the first HARQ process, The second terminal receives the overhead of the service data.

With reference to the second aspect or the first possible implementation manner of the second aspect, the second possible implementation manner of the second aspect further includes:

Receiving, by the second terminal, a sounding reference signal (SRS) sent by the first terminal in the first HARQ process;

The second terminal performs channel measurement according to the SRS, to obtain the channel state information (CSI);

The second terminal sends the CSI to the base station in the first HARQ process, where the CSI is used by the base station to determine the downlink control information according to at least the CSI.

According to the foregoing solution, the second terminal performs measurement on the current transmission channel according to the SRS information sent by the first terminal, and sends the obtained CSI to the base station, so that the base station can perform service data according to the CSI of the current transmission channel. The transmission attribute is adjusted so that the resource or data format occupied by the service data is adapted to the current transmission environment, thereby facilitating the correct reception by the second terminal, and improving the efficiency of data retransmission.

In a third aspect, another data transmission method is provided, including:

Receiving, by the base station, non-acknowledgement (NACK) information sent by the second terminal in a first hybrid automatic repeat request (HARQ) process, where the NACK information is used to indicate that the second terminal does not correctly receive the first terminal according to the Service data sent by the first transmission attribute;

The base station sends downlink control information to the first terminal in the first HARQ process, where the downlink control information is used to indicate a second transmission attribute of the service data, where the second transmission attribute is used for The first terminal retransmits the service data to the second terminal in the first HARQ process.

In conjunction with the first possible implementation of the third aspect, before the transmitting, by the base station, the downlink control information to the first terminal in the first HARQ process, the method further includes:

Receiving, by the base station, channel state information (CSI) sent by the second terminal in the first HARQ process;

Determining, by the base station, the downlink control information according to at least the CSI.

In the above solution, the base station adjusts the transmission attribute of the service data according to the CSI sent by the second terminal, and sends downlink control information indicating the second transmission attribute of the service data to the first terminal, so that the The resource or data format occupied by the service data retransmitted by the first terminal is adapted to the current transmission environment, thereby facilitating the correct reception by the second terminal, and improving the efficiency of data retransmission.

In a fourth aspect, a terminal is provided, including:

a sending unit, configured to send, according to the first transmission attribute, a service data to the second terminal in a first hybrid automatic repeat request (HARQ) process;

The monitoring unit is configured to acquire the downlink control information when the downlink control information sent by the base station is monitored in the first HARQ process, where the downlink control information is used to indicate the second transmission of the service data. Attributes;

The sending unit is further configured to: retransmit the service data to the second terminal in the first HARQ process according to the second transmission attribute;

The terminal is configured to adjust, according to the downlink control information sent by the base station, the transmission attribute of the service data, so that the terminal uses the resource or data format occupied by the service data. It is suitable for the current transmission environment, thereby facilitating the correct reception of the second terminal, and improving the efficiency of data retransmission.

In conjunction with the first possible implementation of the fourth aspect, the listening unit is configured to: listen to the downlink control information in a first subframe of the first HARQ process;

The sending unit is specifically configured to: when the first transmission attribute is different from the second transmission attribute, to the second terminal according to the second transmission attribute in a second subframe of the first HARQ process Retransmitting the business data;

The first subframe and the second subframe are uplink subframes in the first HARQ process, and the first subframe and the second subframe are separated by at least one processing delay. The processing delay indicates a duration required by the terminal to parse the downlink control information.

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the monitoring unit is specifically configured to: in a first sub The first time domain resource of the frame monitors the downlink control information; the first subframe includes multiple time domain resources;

The sending unit is specifically configured to: when the first transmission attribute is the same as the second transmission attribute, retransmit the service according to the second transmission attribute in a second time domain resource of the first subframe. data.

With reference to any one of the possible implementation manners of the fourth aspect to the second possible implementation of the fourth aspect, in a third possible implementation manner of the fourth aspect, the method further includes:

And a receiving unit, configured to receive non-acknowledgment (NACK) information sent by the second terminal in the first HARQ process, where the NACK information is used to indicate that the second terminal does not correctly receive the service data.

With reference to any one of the possible implementations of the third aspect to the third possible implementation of the fourth aspect, in a fourth possible implementation manner of the fourth aspect, the sending unit is further configured to The listening unit does not monitor in the first time domain resource of the first subframe of the first HARQ process. When the downlink control information is sent by the base station, the service data is retransmitted to the second terminal according to the first transmission attribute in the second time domain resource of the first subframe.

In a fifth aspect, another terminal is provided, including: a sending unit and a receiving unit;

The sending unit is configured to: when the receiving unit does not correctly receive the service data sent by the first terminal in the first hybrid automatic repeat request (HARQ) process according to the first transmission attribute, in the first HARQ process Sending a non-acknowledgement (NACK) message to the base station, where the NACK information is used to indicate that the terminal does not correctly receive the service data;

The receiving unit is configured to receive, in the first HARQ process, the service data that is retransmitted by the first terminal according to the second transmission attribute, where the second transmission attribute is the first terminal according to the Determining, by the base station, downlink control information sent in the first HARQ process;

When the terminal does not correctly receive the service data, the terminal sends the NACK information to the base station, so that the base station can send the downlink control information to adjust the transmission attribute of the first terminal to retransmit the service data, so that the service is enabled. The resource or data format occupied by the data is suitable for the current transmission environment, thereby facilitating the correct reception of the terminal and improving the efficiency of data retransmission.

In a first possible implementation manner of the fifth aspect, the receiving unit is further configured to: receive the downlink control information that is sent by the base station in the first HARQ process; A second transmission attribute indicating the service data.

With reference to the fifth aspect, or the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect,

The receiving unit is further configured to receive a sounding reference signal (SRS) sent by the first terminal in the first HARQ process;

The channel measurement unit is configured to perform channel measurement according to the SRS, to obtain the channel state information (CSI);

The sending unit is further configured to send the CSI to the base station in the first HARQ process, where the CSI is used by the base station to determine the downlink control information according to at least the CSI.

In a sixth aspect, a base station is provided, including:

a receiving unit, configured to receive non-acknowledgement (NACK) information sent by the second terminal in a first hybrid automatic repeat request (HARQ) process, where the NACK information is used to indicate that the second terminal does not correctly receive the Service data sent by the first terminal according to the first transmission attribute;

a sending unit, configured to send downlink control information to the first terminal in the first HARQ process, where the downlink control information is used to indicate a second transmission attribute of the service data, where the second transmission attribute Used by the first terminal to retransmit the service data to the second terminal in the first HARQ process.

In combination with the first possible implementation manner of the sixth aspect, the determining unit is further included;

The receiving unit is further configured to receive channel state information (CSI) sent by the second terminal in the first HARQ process;

The determining unit is configured to determine the downlink control information according to at least the CSI.

Using the foregoing base station, the base station adjusts the transmission attribute of the service data according to the CSI sent by the second terminal, and sends downlink control information indicating the second transmission attribute of the service data to the first terminal, so that the The resource or data format occupied by the service data retransmitted by the first terminal is adapted to the current transmission environment, thereby facilitating the correct reception by the second terminal, and improving the efficiency of data retransmission.

In a seventh aspect, a terminal is provided, including:

a transmitter, configured to send, according to the first transmission attribute, a service data to the second terminal in a first hybrid automatic repeat request (HARQ) process;

a receiver, configured to: when the downlink control information sent by the base station is monitored in the first HARQ process, acquire the downlink control information, where the downlink control information is used to indicate a second transmission of the service data Attributes;

The transmitter is further configured to retransmit the service data to the second terminal in the first HARQ process according to the second transmission attribute;

In a first possible implementation manner of the seventh aspect, the receiver is configured to: monitor, in the first subframe of the first HARQ process, the downlink control information;

The transmitter is specifically configured to: when the first transmission attribute is different from the second transmission attribute, to the second terminal according to the second transmission attribute in a second subframe of the first HARQ process Retransmitting the business data;

With reference to the seventh aspect, or the first possible implementation manner of the seventh aspect, in a second possible implementation manner of the seventh aspect, the receiver is specifically configured to: in a first sub The first time domain resource of the frame monitors the downlink control information; the first subframe includes multiple time domain resources;

The transmitter is specifically configured to: when the first transmission attribute is the same as the second transmission attribute, retransmit the service according to the second transmission attribute in a second time domain resource of the first subframe. data.

With reference to any one of the possible implementation manners of the second aspect, the second possible implementation manner of the seventh aspect, in a third possible implementation manner of the seventh aspect, the receiver is further configured to receive Non-acknowledgment (NACK) information sent by the second terminal in the first HARQ process, where the NACK information is used to indicate that the second terminal does not correctly receive the service data.

With reference to any one of the possible implementation manners of the third aspect to the third possible implementation manner of the seventh aspect, in a fourth possible implementation manner of the seventh aspect, the transmitter is further configured to When the receiver does not listen to the downlink control information sent by the base station in the first time domain resource of the first subframe of the first HARQ process, the first transmission attribute is in the first sub The second time domain resource of the frame retransmits the service data to the second terminal.

In an eighth aspect, a terminal is provided, including: a transmitter and a receiver;

The transmitter is configured to: when the receiver does not correctly receive the service data sent by the first terminal in the first hybrid automatic repeat request (HARQ) process according to the first transmission attribute, send in the first HARQ process Non-acknowledgement (NACK) information to the base station, wherein the NACK information is used Indicates that the terminal does not correctly receive the service data;

The receiver is configured to receive, in the first HARQ process, the service data that is retransmitted by the first terminal according to a second transmission attribute, where the second transmission attribute is that the first terminal is according to the Determining, by the base station, downlink control information sent in the first HARQ process;

In a first possible implementation manner of the eighth aspect, the receiver is further configured to receive the downlink control information that is sent by the base station in the first HARQ process; the downlink control information is used to A second transmission attribute indicating the service data.

With reference to the eighth aspect, or the first possible implementation manner of the eighth aspect, in a second possible implementation manner of the eighth aspect,

The receiver is further configured to receive a sounding reference signal (SRS) sent by the first terminal in the first HARQ process;

The processor is configured to perform channel measurement according to the SRS, to obtain the channel state information (CSI);

The transmitter is further configured to send the CSI to the base station in the first HARQ process, where the CSI is used by the base station to determine the downlink control information according to at least the CSI.

In a ninth aspect, another base station is provided, including:

a receiver, configured to receive non-acknowledgement (NACK) information sent by the second terminal in a first hybrid automatic repeat request (HARQ) process, where the NACK information is used to indicate that the second terminal does not correctly receive the Service data sent by the first terminal according to the first transmission attribute;

a transmitter, configured to send downlink control information to the first terminal in the first HARQ process, where the downlink control information is used to indicate a second transmission attribute of the service data, where the second transmission attribute Used by the first terminal to retransmit the service data to the second terminal in the first HARQ process.

In conjunction with the first possible implementation manner of the ninth aspect, the method further includes: a processor;

The receiver is further configured to receive, by the second terminal, the second terminal sent in the first HARQ process Channel state information (CSI);

The processor is configured to determine the downlink control information according to at least the CSI.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying for inventive labor.

FIG. 1 is a schematic flowchart of a data transmission method according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a subframe according to an embodiment of the present disclosure;

FIG. 3 is a HARQ process according to an embodiment of the present invention;

FIG. 4 is another HARQ process table according to an embodiment of the present invention;

FIG. 5 is still another HARQ process table according to an embodiment of the present invention;

FIG. 6 is still another HARQ process table according to an embodiment of the present invention;

FIG. 7 is a schematic flowchart diagram of another data transmission method according to an embodiment of the present disclosure;

FIG. 8 is a schematic flowchart diagram of still another data transmission method according to an embodiment of the present disclosure;

FIG. 9 is a schematic flowchart diagram of still another data transmission method according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of a terminal according to an embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram of another terminal according to an embodiment of the present disclosure;

FIG. 12 is a schematic structural diagram of a base station according to an embodiment of the present disclosure;

FIG. 13 is a schematic structural diagram of still another terminal according to an embodiment of the present disclosure;

FIG. 14 is a schematic structural diagram of still another terminal according to an embodiment of the present disclosure;

FIG. 15 is a schematic structural diagram of another base station according to an embodiment of the present invention.

detailed description

In order to facilitate the technical personnel provided by the present invention to understand the technical solution provided by the present invention, the hybrid automatic repeat request (English name: Hybrid Automatic Repeat Request, abbreviated as: HARQ) is firstly used. Introduce:

HARQ is a physical layer technology that combines automatic repeat request (English full name: Automatic Repeat Request, ARQ) and forward error correction (English full name: Forward Error Correction, FEC). Reduce the negative impact of channel and interference jitter on data transmission.

In the prior art, the HARQ works between the base station and the two physical devices of the terminal, and the specific working process is: the base station sets a data unit of the medium access control (English name: Media Access Control, MAC for short) (English full name: Protocol Data Unit (PDU), which is coded according to the specific specifications of the physical layer, and generates multiple different redundancy versions of the data unit (English name: Redundancy Version, RV for short), where each RV carries the same The original data, the base station only sends one RV of the data unit at a time, and after receiving the first RV of the data unit, the terminal decodes the data unit, and if the decoding is successful, the terminal sends an acknowledgement to the base station (English full name: Acknowledgement (abbreviation: ACK) information, after receiving the ACK message, the base station does not send the subsequent RV of the data unit. If the decoding fails, the terminal sends a non-confirmation to the base station (English name: Non-Acknowledgement; NACK for short) The information is used to request the base station to send the next RV of the data unit to implement data retransmission.

However, the physical device involved in the data retransmission of the D2D communication includes the base station, the source terminal of the D2D communication, and the destination terminal of the D2D communication. Therefore, the HARQ technology applied to the base station and the single terminal in the prior art is not applicable to the D2D. The data retransmission of the communication, the following embodiment of the present invention improves the efficiency of data retransmission by controlling the adaptive and non-adaptive retransmission of D2D communication by the base station.

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

First, it should be noted that the technical solution provided by the following embodiments of the present invention can be applied to a wireless communication network, for example, long term evolution (English term: Long Term Evolution, LTE for short) System, advanced Long Term Evolution Advanced (LTE-A) system, and its further evolution network.

In the following embodiments of the present invention, the base station may be a device that communicates with a terminal or other communication station, such as a relay station. For example, the base station may specifically be an evolved base station in an LTE system (English full name: Evolutional Node B, referred to as ENB) Or eNodeB), or other access network devices providing access services in a wireless communication network.

The terminal can also be called a user equipment (English name: User Equipment, UE for short). For example, it can be a cellular phone (English name: Cellular Phone), a personal digital assistant (English full name: Personal Digital Assistant, PDA for short), handheld A wireless communication device such as a device (English name: Handheld) or a laptop computer (English name: Laptop Computer). When the UE is applied to D2D communication, the UE may be referred to as a D2D terminal, and may specifically be a smart meter, a smart home appliance, or the like. A device that supports D2D communication.

The embodiment of the invention provides a data transmission method. As shown in FIG. 1 , the method includes:

S101. The first terminal sends the service data to the second terminal in the first HARQ process according to the first transmission attribute.

The value indicates that the transmission attribute of the service data includes at least one of the following information: a resource occupied by the service data, and a data format of the service data.

The first HARQ process is a HARQ process that is allocated by the base station to the first terminal and the second terminal, and the interaction between the base station, the first terminal, and the second terminal is implemented by using the first HARQ process.

The HARQ process includes a subframe set with a certain timing relationship defined by the base station, and each subframe includes multiple time domain resources. FIG. 2 is a schematic structural diagram of a subframe according to an embodiment of the present invention, where the subframe includes downlink control. The domain, the uplink/downlink data domain, and the uplink control domain are three time domain resources. The subframe in which the data domain is the uplink data domain is called an uplink subframe, and the subframe in which the data domain is a downlink data domain is called a downlink subframe.

The value indicates that the subframe shown in FIG. 2 has the characteristics of time division duplex (English full name: Time Division Duplexing, TDD for short), based on the HARQ process set by the subframe shown in FIG. 2, Since the control field of the same attribute in each subframe occupies the same symbol position in the subframe, the other symbol positions occupy the data, so all the control fields of the same attribute are aligned, which avoids the flexible configuration of the downlink subframe. Interference between control domains of different attributes in a sub-frame. Moreover, since the base station needs to use the downlink subframe to broadcast the important system message, in order to avoid conflict with the base station, the uplink subframe is usually used to implement D2D communication in the prior art.

For example, the embodiment of the present invention provides a first HARQ process. As shown in FIG. 3, the ratio of the downlink subframe to the uplink subframe of the first HARQ process is 0:5, as shown in FIG. UL=0:5, and the processing delay of the first HARQ process is 3 ms (millisecond), and the processing delay is related to the processing time of the data packet. For example, after the first terminal sends the service data in the subframe 0, the first terminal The second terminal needs to receive and process the service data after a delay of 3 ms to send feedback information in the subframe 4.

It should be noted that FIG. 3 only shows partial subframes in the first HARQ process, that is, subframe 0 to subframe 12, and the numbers 0-12 of the partial subframes are only 13 sub-mengs shown in FIG. The relative number of the frame is not the absolute number in the first HARQ process, that is, the subframe 0 may not be the first subframe of the first HARQ process, before the subframe 0 and after the subframe 12 Other subframes may also be included, and other subframes of the first HARQ process may be determined according to subframe 0 to subframe 12 analogy. In addition, each subframe of the first HARQ process includes three time domain resources, such as 0/1, 0/2, and 0/3 of subframe 0 shown in FIG. 3, and the subframe shown in FIG. 2 is For example, 0/1 indicates the downlink control domain, 0/2 indicates the uplink data field, and 0/3 indicates the uplink control domain.

Step S101 is described in detail below based on the first HARQ process shown in FIG. 3. Specifically, before step S101, the base station allocates a first HARQ process as shown in FIG. 3 to the first terminal and the second terminal, and the The base station sends downlink control information (English name: Downlink Control Information, DCI for short) to the first terminal in the first time domain resource of the fourth subframe before the subframe 0 of the first HARQ process, for example, the downlink control domain. The downlink control information indicates a first transmission attribute of the service data that is first transmitted by the first terminal, where the first transmission attribute may include a frequency domain resource, a time domain resource, a code division resource, a time slot resource, and the frequency resource occupied by the service data. The first terminal sends the transmit power, the data format, and the like of the service data, and after a processing delay, the first terminal according to the first A transmission attribute transmits the service data in a second time domain resource of subframe 0 of the first HARQ process, and the letter D shown in FIG. 3 represents the service data.

S102. The first terminal acquires the downlink control information when the downlink control information sent by the base station is monitored by the first terminal in the first HARQ process.

The downlink control information is used to indicate a second transmission attribute of the service data.

Specifically, after the first terminal sends the service data to the second terminal according to the first transmission attribute, the first terminal may perform blind detection on each subsequent subframe in the first HARQ process to obtain the base station. Downlink control information sent by the first HARQ process.

It should be noted that the first terminal and the base station may pre-agreed a subframe for transmitting downlink control information in the first HARQ process, so that the base station may not need to perform blind detection on each subframe, and only needs to agree on the sub-frame. The frame is monitored to obtain the downlink control information sent by the base station, and is still illustrated by using the following figure. After the first terminal sends the service data to the second terminal in the subframe 0 of the first HARQ process, the first terminal listens to the first HARQ. The first time domain resource of the subframe 8 in the process is used to obtain downlink control information sent by the base station in the first time domain resource of the subframe 8.

In a possible implementation manner of the embodiment of the present invention, before the step S102, the second terminal sends feedback information in the first HARQ process, where the feedback information is used to indicate whether the second terminal correctly receives the service data, The first HARQ process shown in FIG. 3 illustrates that the second terminal sends the feedback information in the third time domain resource of the subframe 4, that is, the uplink control domain, specifically, if the second terminal correctly receives the first terminal Sending the service data, the second terminal sends the ACK information in the third time domain resource of the subframe 4, wherein the letter A shown in FIG. 3 represents the ACK information, and if the second terminal does not correctly receive the The second terminal transmits the NACK information in the third time domain resource of the subframe 4, wherein the letter N shown in FIG. 3 indicates the NACK information.

Further, the base station may listen to the third time domain resource of the subframe 4, so as to obtain feedback information sent by the second terminal, and if the feedback information is ACK information, the base station may be in the first time domain resource of the subframe 8. And transmitting, by the first terminal, the downlink control information of the transmission attribute of the next service data, where the first terminal monitors the downlink control signal in the first time domain resource of the subframe 8 After the information, the next service data is sent according to the transmission attribute indicated by the downlink control information; if the feedback information is NACK information, the base station may determine downlink control information indicating the second transmission attribute of the service data, and in the first HARQ The first time domain resource of the subframe 8 of the process sends the downlink control information to the first terminal.

The value indicates that, when determining that the second terminal does not correctly receive the service data, the base station may determine, according to a current channel quality between the first terminal and the second terminal, a second transmission attribute indicating the service data. Downlink control information, therefore, in a possible implementation manner of the embodiment of the present invention, after the first HARQ process sends the service data to the second terminal according to the first transmission attribute, the first terminal may also be in the first The HARQ process sends a sounding reference signal (Sounding Reference Signal, SRS for short) to the second terminal, and the channel state information obtained by the second terminal according to the SRS channel measurement (English name: Channel State Information, referred to as: The CSI is sent to the base station. As illustrated in FIG. 3, the first terminal sends an SRS to the second terminal in the third time domain resource of the subframe 0, and the second time domain resource of the second terminal in the subframe 4 is sent to the base station. Sending CSI, the base station determines the downlink control information according to the CSI, and indicates the second transmission attribute of the service data.

The foregoing is only an example. The base station may further determine the downlink control information, for example, the resource allocation information maintained by the base station according to other information. Specifically, the base station may allocate multiple terminal terminals according to the resource allocation information maintained by the base station. The continuous spectrum can improve the utilization of the spectrum resources, and can also prevent the first terminal from retransmitting the conflict between the resources occupied by the service data and the resources occupied by other terminals that access the base station. This is not limited.

S103. The first terminal retransmits the service data to the second terminal in the first HARQ process according to the second transmission attribute.

It can be seen from the foregoing steps S101 to S103 that the first terminal can adjust the transmission attribute of the service data according to the downlink control information sent by the base station before retransmitting the service data to the second terminal, so that the service data is occupied. The resource or data format is suitable for the current transmission environment, thereby facilitating the correct reception of the second terminal, and improving the efficiency of data retransmission.

It is worth noting that the second transmission attribute may be the same as or different from the first transmission attribute. Specifically, in a possible implementation manner of the embodiment of the present invention, the first terminal monitors the downlink control information in the first subframe of the first HARQ process, if the first transmission attribute and the second transmission If the attributes are different, the first terminal retransmits the service data to the second terminal in the second subframe of the first HARQ process according to the second transmission attribute.

The first subframe and the second subframe are uplink subframes in the first HARQ process, and the first subframe and the second subframe are separated by at least one processing delay.

For example, as shown in FIG. 3, after receiving the downlink control information sent by the base station, the first time domain resource of the subframe 8 parses the downlink control information and configures the service data after a processing delay. After the second transmission attribute, the first terminal retransmits the service data in a subframe 12 after processing delay according to the second transmission attribute.

In another possible implementation manner of the embodiment of the present invention, the first terminal monitors the downlink control information in a first time domain resource of the first subframe of the first HARQ process, if the first transmission attribute is The second transmission attribute is the same, and the first terminal retransmits the service data in the second time domain resource of the first subframe according to the second transmission attribute.

After the downlink control information sent by the first terminal in the first time domain resource of the first subframe is received by the first terminal, if the second transmission attribute indicated by the downlink control information is the same as the first transmission attribute, The first transmission attribute is suitable for the current transmission environment, so that the first terminal can directly perform the second time domain resource of the first subframe, because the first terminal does not need to reconfigure the transmission attribute of the service data. Data retransmission without a processing delay increases the efficiency of data retransmission.

In another possible implementation manner of the embodiment of the present invention, the first terminal receives NACK information sent by the second terminal in the first HARQ process, where the NACK information is used to indicate that the second terminal does not correctly receive the Business data.

Further, when the first terminal does not listen to the downlink control information sent by the base station in the first time domain resource of the first subframe of the first HARQ process, the first terminal is in the first subframe according to the first transmission attribute. The second time domain resource retransmits the service data to the second terminal.

It should be noted that the foregoing is exemplified by the first HARQ process shown in FIG. 3, The first HARQ process occupies only one time axis. In a preferred implementation manner of the embodiment of the present invention, the HARQ process allocated by the base station to the first terminal and the second terminal may occupy three time axes, such as As shown in FIG. 4, in the case that the ratio of the downlink subframe to the uplink subframe is 0:5, and the processing delay is 3 ms, the first to fourth HARQ processes each include three time axes, and thus, if the first When the first time domain resource of the subframe 8 of the first HARQ process does not receive the downlink control information sent by the base station, the first terminal does not need to process the downlink control information after a processing delay, so the first The terminal may retransmit the service data directly in the second time domain resource of the subframe 8 according to the first transmission attribute, that is, the first terminal may jump from the first time axis of the first HARQ process to the second time. The time axis, as shown in FIG. 4, the subframe 8 of the second time axis of the first HARQ process carries the service data in the second time domain resource.

The reason why the first terminal does not listen to the downlink control information sent by the base station in the subframe 8 may be that the base station determines, according to the feedback information sent by the second terminal, that the second terminal does not correctly receive the first terminal. After the service data, the transmission attribute of the service data is not required to be adjusted according to the channel quality between the first terminal and the second terminal and the resource allocation information maintained by the base station. In this case, the base station may not be in the subframe 8. Send DCI.

After the downlink control information sent by the first terminal in the first time domain resource of the first subframe is received by the first terminal, if the second transmission attribute indicated by the downlink control information is the same as the first transmission attribute, The first transmission attribute is suitable for the current transmission environment, so that the first terminal can directly perform the second time domain resource of the first subframe, because the first terminal does not need to reconfigure the transmission attribute of the service data. The data is retransmitted without a processing delay, which improves the efficiency of data retransmission. That is to say, the first terminal needs to undergo a processing delay in the subframe 12 compared to the first HARQ process shown in FIG. Retransmitting the data, using the first HARQ process as shown in FIG. 4, the first terminal can perform data retransmission in the second time domain resource of the subframe 8 without waiting for a processing delay, thereby reducing the retransmission delay. Improve the efficiency of data retransmission.

In addition, FIG. 3 and FIG. 4 only show the HARQ process when the ratio of the uplink subframe to the downlink subframe is 0:5. In the specific implementation process, the ratio of the uplink subframe to the downlink subframe may be more. In the case, as shown in FIG. 5 and FIG. 6, FIG. 5 shows that when the ratio of the uplink subframe to the downlink subframe is 1:4, In the HARQ process, FIG. 6 shows a HARQ process when the ratio of the uplink subframe to the downlink subframe is 2:3, and the specific proportioning manner is not limited in the embodiment of the present invention.

Another embodiment of the present invention provides another data transmission method. As shown in FIG. 7, the method includes:

S701. The second terminal sends the NACK information to the base station in the first HARQ process when the second terminal does not correctly receive the service data that is sent by the first terminal according to the first transmission attribute in the first HARQ process.

The NACK information is used to indicate that the second terminal does not correctly receive the service data.

It is to be noted that the reason why the second terminal does not correctly receive the service data may be multiple. For example, the transmit power of the first terminal sending the service data is too low, so that the second terminal does not receive the service data. Alternatively, the second terminal receives the service data, but the decoding of the service data fails.

S702. The second terminal receives, in the first HARQ process, the service data that is retransmitted by the first terminal according to the second transmission attribute.

The second transmission attribute is determined by the first terminal according to downlink control information sent by the base station in the first HARQ process.

For example, the first HARQ process shown in FIG. 3 is used as an example. After the second terminal does not correctly receive the service data sent by the first terminal in the subframe 0 of the first HARQ process, the second terminal may be in the subframe 4. The third time domain resource sends the NACK information to the base station, so that after the base station determines that the second terminal does not correctly receive the service data according to the NACK information, the first time domain resource in the subframe 8 may be the first time domain resource. The terminal sends downlink control information, where the downlink control domain is used to indicate that the first terminal retransmits the second transmission attribute of the service data, and further, the first terminal may send the first to the first subframe 12 according to the second transmission attribute. The terminal retransmits the service data.

As shown in the foregoing step S701 to step S702, the second terminal sends the NACK information to the base station when the service data is not correctly received, so that the base station can send the downlink control information to adjust the transmission attribute of the first terminal to retransmit the service data. Therefore, the resource or data format occupied by the service data is adapted to the current transmission environment, thereby facilitating the correct reception of the second terminal, and improving the efficiency of data retransmission.

Optionally, the second terminal receives the sounding reference signal SRS sent by the first terminal in the first HARQ process, performs channel measurement according to the SRS, obtains the channel state information CSI, and sends the channel state information in the first HARQ process. The CSI is sent to the base station, where the CSI is used by the base station to determine the downlink control information according to at least the CSI.

For example, in the first HARQ process, as shown in FIG. 3, the first terminal may send the SRS to the second terminal in the third time domain resource of the subframe 0, and the second terminal may delay after processing. The second time domain resource of subframe 4 transmits the CSI measured according to the SRS to the base station.

In this way, the base station can adjust the transmission attribute of the service data according to the CSI of the current transmission channel, so that the resource or data format occupied by the service data is suitable for the current transmission environment, thereby facilitating the correct reception of the second terminal, and improving the data weight. Passing efficiency.

It should be noted that, in step S702, the second terminal may perform blind detection on each subframe in the first HARQ process to obtain the service data retransmitted by the first terminal.

In a possible implementation manner of the embodiment of the present invention, the second terminal may receive the downlink control information sent by the base station in the first HARQ process, where the downlink control information is used to indicate the second transmission of the service data. Attributes.

That is, the base station sends the downlink control information to the first terminal and the second terminal simultaneously in the first HARQ process, so that the first terminal retransmits according to the second transmission attribute indicated by the downlink control information. The service data, the second terminal may determine, according to the second transmission attribute indicated by the downlink control information, which subframe of the first HARQ process the first terminal performs data retransmission, such that the second terminal The service data retransmitted by the first terminal is obtained by monitoring the subframe, and the second terminal does not need to perform blind detection on each subframe of the first HARQ process, thereby reducing the second terminal receiving the service data. s expenses.

It should be noted that the specific manner in which the first terminal retransmits the service data according to the second transmission attribute may refer to the corresponding description in the method embodiment corresponding to the first terminal, and details are not described herein again.

In addition, the foregoing is exemplified by the HARQ process shown in FIG. 3, wherein FIG. 3 and FIG. 4 only show the HARQ process when the ratio of the uplink subframe to the downlink subframe is 0:5, in specific During the implementation process, there may be multiple cases in the ratio of the uplink subframe to the downlink subframe, as shown in Figure 5 and Figure 6. As shown in FIG. 5, the HARQ process is performed when the ratio of the uplink subframe to the downlink subframe is 1:4, and FIG. 6 shows the ratio of the uplink subframe to the downlink subframe when the ratio is 2:3. The HARQ process, the embodiment of the present invention does not limit the specific proportioning manner.

Another embodiment of the present invention provides a data transmission method. As shown in FIG. 8, the method includes:

S801. The base station receives NACK information sent by the second terminal in the first HARQ process.

The NACK information is used to indicate that the second terminal does not correctly receive the service data that is sent by the first terminal according to the first transmission attribute.

For example, before the step S801, the base station may send downlink control information indicating the first transmission attribute of the initial service data to the first terminal, so that the first terminal sends the first HARQ process according to the first transmission attribute. After the service data, if the second terminal correctly receives the service data, the first HARQ process sends an ACK message to the base station, to notify the base station that the second terminal has correctly received the service data, if the second terminal If the service data is not correctly received, the second terminal sends NACK information in the first HARQ process to notify the base station that the second terminal does not correctly receive the service data.

S802. The base station sends downlink control information to the first terminal in the first HARQ process.

The downlink control information is used to indicate a second transmission attribute of the service data, where the second transmission attribute is used by the first terminal to retransmit the service data to the second terminal in the first HARQ process.

The foregoing step S801 to step S802, the base station may send the downlink control information to adjust the transmission attribute of the service data retransmitted by the first terminal each time, so that the resource or data format occupied by the service data is adapted to the current transmission environment, thereby facilitating the The second terminal receives correctly, which improves the efficiency of data retransmission.

Optionally, the base station may further receive channel state information CSI sent by the second terminal in the first HARQ process before sending the downlink control information to the first terminal in the first HARQ process, and at least according to the CSI. Determine the downlink control information.

As illustrated in FIG. 3, the first terminal sends an SRS to the second terminal in the third time domain resource of the subframe 0, and the second terminal sends the CSI to the base station in the second time domain resource of the subframe 4. The CSI determines downlink control information to indicate a second transmission attribute of the service data.

The foregoing is only an example. The base station may further determine, according to other information, downlink control information indicating a second transmission attribute of the service data, for example, resource allocation information maintained by the base station itself, and specifically, the base station may allocate resources according to its own maintenance. The information is allocated to the contiguous spectrum for multiple terminals at the same time, and the utilization of the spectrum resources is improved, and the possibility that the first terminal retransmits the resources occupied by the service data and the resources occupied by other terminals accessing the base station may be avoided. The conflicts that occur in the embodiments of the present invention are not limited thereto.

In this way, the base station can adjust the transmission attribute of the service data according to the CSI sent by the second terminal, and send the downlink control information indicating the second transmission attribute of the service data to the first terminal, so that the first terminal retransmits The resource or data format occupied by the service data is suitable for the current transmission environment, thereby facilitating the correct reception of the second terminal, and improving the efficiency of data retransmission.

It should be noted that the foregoing is exemplified by the HARQ process shown in FIG. 3, wherein FIG. 3 and FIG. 4 only show the HARQ process when the ratio of the uplink subframe to the downlink subframe is 0:5. In the specific implementation process, there may be multiple cases in the ratio of the uplink subframe to the downlink subframe. As shown in FIG. 5 and FIG. 6, FIG. 5 shows that the ratio of the uplink subframe to the downlink subframe is 1. The HARQ process of the 4th hour, FIG. 6 shows the HARQ process when the ratio of the uplink subframe to the downlink subframe is 2:3, and the specific proportioning manner is not limited in the embodiment of the present invention.

In order to enable a person skilled in the art to more clearly understand the technical solution of a data transmission method provided by the present invention, the following detailed description is made with reference to FIG. 4, as shown in FIG. 9, including:

S901. The base station sends the first DCI to the first terminal and the second terminal in the first HARQ process.

The first DCI is used to indicate a first transmission attribute of the service data initially transmitted by the first terminal.

It should be noted that, before step S901, the base station may allocate multiple HARQ processes to the first terminal and the second terminal, such as the first to fourth HARQ processes shown in FIG. 4, and select multiple HARQ processes. At least one of the HARQ processes controls data transmission between the first terminal and the second terminal, as illustrated by the first HARQ process in FIG. 4, and FIG. 4 only shows the first A partial subframe of the HARQ process, according to the subframe 0 to the subframe 15 of the first HARQ process, may be used to derive other subframes of the first HARQ process, for example, the first time domain of the fourth subframe before the subframe 0 The resource may carry the first DCI sent by the base station.

S902. The first terminal initiates service data in the first HARQ process according to the first transmission attribute indicated by the first DCI, and sends an SRS in the first HARQ process.

Specifically, the first terminal may send the service data and the SRS in the same subframe, for example, the subframe 0 of the first HARQ process shown in FIG. 4, where the second time domain resource of the subframe 0 carries the service data, The third time domain resource carries the SRS, where the second time domain resource may be an uplink data domain resource of the subframe 0, and the third time domain resource may be an uplink control domain resource of the subframe 0.

S903. The second terminal monitors the service data according to the first transmission attribute indicated by the first DCI, and listens to the SRS.

S904. After the second terminal monitors the SRS, perform channel measurement according to the SRS to obtain CSI.

Further, if the second terminal correctly receives the service data, step S905 and its subordinate branches are executed. If the second terminal does not correctly receive the service data, step S908 and its subordinate branches are executed.

S905. The second terminal sends the ACK information and the CSI in the first HARQ process.

For example, the second terminal may send the CSI in the second time domain resource of the subframe 4 of the first HARQ process as shown in FIG. 4, and send the ACK information in the third time domain resource of the subframe 4.

S906. After receiving the ACK information and the CSI, the base station determines, according to the CSI, a second DCI, where the second DCI is used to indicate that the first terminal newly transmits a transmission attribute of the next service data.

For example, the second DCI may indicate that the first terminal transmits the next service data by carrying a new transmission identifier.

S907. The base station sends a second DCI to the first terminal and the second terminal in the first HARQ process.

S908. The second terminal sends the NACK information and the CSI in the first HARQ process.

Specifically, the second terminal may send the NACK information and the CSI in the same subframe. For example, in the subframe 4 of the first HARQ process shown in FIG. 4, the second time domain resource of the subframe 4 carries the CSI, and the third time domain resource carries the NACK information.

S909. After receiving the NACK information and the CSI, the base station determines that the first terminal performs adaptive retransmission or non-adaptive retransmission.

The adaptive retransmission refers to the retransmission performed after the first terminal adjusts the transmission attribute of the service data; the non-adaptive retransmission refers to the first terminal maintaining the transmission attribute of the service data unchanged. Retransmission.

Specifically, after determining, according to the NACK information, the second terminal does not correctly receive the service data, the base station determines, according to the CSI, that the first terminal performs adaptive retransmission or non-adaptive retransmission. For example, the base station determines that the first terminal performs non-adaptive retransmission when determining that the channel quality between the first terminal and the second terminal does not deteriorate, and determines between the first terminal and the second terminal. When the channel quality deteriorates, it is determined that the first terminal performs adaptive retransmission.

Further, if the base station determines that the first terminal performs adaptive retransmission, step S910 and its subordinate branches are executed. If the base station determines that the first terminal performs non-adaptive retransmission, step S913 and its subordinate branches are performed.

S910. The base station sends a third DCI in the first HARQ process, where the third DCI is used to indicate a second transmission attribute of the service data.

The second transmission attribute is different from the first transmission attribute.

It is to be noted that the third DCI may carry a retransmission identifier, which is used to indicate that the first terminal retransmits the service data initially transmitted in step S902, as compared with the second DCI in step S906.

The foregoing is only an example. In another possible implementation manner of the embodiment of the present invention, the first terminal and the second terminal may obtain a preset maximum number of retransmissions, so that the first terminal receives the second terminal. After the ACK information is sent, the next service data is newly transmitted according to the next DCI sent by the base station, so that the new terminal does not need to be carried in the DCI; after receiving the NACK information sent by the second terminal, the first terminal Each retransmission of the service data is counted. If the number of times does not reach the preset maximum number of retransmissions, the first terminal retransmits according to the next DCI sent by the base station. The service data, so that the retransmission identifier does not need to be carried in the DCI.

S911. After the first terminal monitors the third DCI sent by the base station, the first terminal retransmits the service data in the first HARQ process according to the second transmission attribute indicated by the third DCI.

S912: After listening to the third DCI sent by the base station, the second terminal receives the service data in the first HARQ process according to the second transmission attribute indicated by the third DCI.

S913. The first terminal receives the NACK information sent by the second terminal in the first HARQ process, and after determining that the third DCI sent by the base station is not monitored, according to the first transmission attribute, the first HARQ process is heavy. Pass the business data.

For example, as shown in FIG. 4, since the first HARQ process includes three time axes, the first time domain resource of the first terminal in the subframe 8 of the first time axis of the first HARQ process is not When the third DCI is monitored, the second time domain resource of the subframe 8 of the second time axis of the first HARQ process may be retransmitted to retransmit the service data, which is required to be The third DCI is monitored, so that the first terminal does not need to process the third DCI through a processing delay, so that the first terminal can directly maintain the first transmission attribute unchanged in the second time domain resource of the subframe 8. Passing the business data improves the efficiency of retransmission.

S914. After determining that the third DCI sent by the base station is not monitored, the second terminal receives the service data in the first HARQ process according to the first transmission attribute.

When the base station determines that the second terminal does not correctly receive the data according to the NACK information sent by the second terminal, the base station may simultaneously send the DCI to the first terminal and the second terminal, and use the data transmission attribute. The adjustment is made to make the system resource allocation more reasonable, so that the resource or data format occupied by the data is more suitable for the second terminal to receive, which improves the efficiency of data retransmission.

It should be noted that, for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should understand that the present invention is not limited by the described action sequence, and secondly, It should also be understood by those skilled in the art that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the present invention. For example, after step S909, the base station determines the first terminal. Perform adaptive retransmission or non-adaptive weight In the case of the transmission, the third DCI may be sent in the first HARQ process. In this case, the second transmission attribute may be the same as the first transmission attribute, where the second transmission attribute is the same as the first transmission attribute. The first terminal performs non-adaptive retransmission, and when the second transmission attribute is different from the first transmission attribute, the first terminal performs adaptive retransmission.

The foregoing is a description of the data retransmission method provided by the embodiment of the present invention in a scenario where the first terminal and the second terminal are one-to-one. The data retransmission provided by the embodiment of the present invention should be clearly understood by those skilled in the art. The method is not limited to the one-to-one two terminals. In the scenario of one-to-many in the D2D communication, the embodiment of the present invention is also applicable. For example, the base station can allocate multiple HARQ processes to one source terminal of the D2D communication. The source terminal maintains a HARQ process together with each of the plurality of destination terminals. The data retransmission method on each HARQ process may be specifically described in the data retransmission method provided by the embodiment of the present invention.

In addition, the foregoing is exemplified by the first HARQ process shown in FIG. 4, and those skilled in the art should understand that the above steps S910 to S914 are also applicable to other HARQ processes shown in FIG. 4, for example, the same applies. The HARQ process provided in FIG. 5 and FIG. 6 is not described in detail in this embodiment of the present invention.

The embodiment of the present invention provides a terminal 10. As shown in FIG. 10, the terminal 10 includes:

The sending unit 101 is configured to send the service data to the second terminal in the first HARQ process according to the first transmission attribute.

The first HARQ process is a HARQ process allocated by the base station to the terminal and the second terminal, and the interaction between the base station, the terminal, and the second terminal can be implemented by using the first HARQ process.

The monitoring unit 102 is configured to acquire the downlink control information when the downlink control information sent by the base station is monitored in the first HARQ process.

The sending unit 101 is further configured to: in the first HARQ process according to the second transmission attribute The second terminal retransmits the service data.

For example, the base station allocates a first HARQ process as shown in FIG. 3 to the terminal, and the base station sends downlink control to the terminal in the first time domain resource of the fourth subframe before the subframe 0 of the first HARQ process. Information, the downlink control information indicates a first transmission attribute of the service data initially transmitted by the terminal, where the first transmission attribute may include a frequency domain resource occupied by the service data, a time domain resource, a code division resource, and the terminal sends The transmit power of the service data, the data format, and the like, such that after a processing delay, the terminal transmits the service data according to the first transmission attribute in the second time domain resource of the subframe 0 of the first HARQ process.

Further, the second terminal sends the feedback information in the third time domain resource of the subframe 4. Specifically, if the second terminal correctly receives the service data sent by the terminal, the second terminal is in the third of the subframe 4. The time domain resource sends the ACK information. If the second terminal does not correctly receive the service data sent by the terminal, the second terminal sends the NACK information in the third time domain resource of the subframe 4.

Further, the base station may listen to the third time domain resource of the subframe 4, so as to obtain feedback information sent by the second terminal, and if the feedback information is ACK information, the base station may be in the first time domain resource of the subframe 8. And transmitting downlink control information for indicating that the terminal sends the transmission attribute of the next service data, so that after the terminal monitors the downlink control information in the first time domain resource of the subframe 8, the terminal indicates the transmission according to the downlink control information. The attribute sends the next service data; if the feedback information is NACK information, the base station may determine downlink control information indicating a second transmission attribute of the service data, and the first time domain resource in the subframe 8 of the first HARQ process Sending the downlink control information to the terminal.

In this way, the terminal provided by the embodiment of the present invention can adjust the transmission attribute of the service data according to the downlink control information sent by the base station, so that the service data is adjusted before the service data is retransmitted to the second terminal. The occupied resource or data format is suitable for the current transmission environment, thereby facilitating the correct reception of the second terminal, and improving the efficiency of data retransmission.

Optionally, the monitoring unit 102 is configured to: in the first subframe of the first HARQ process, listen to the downlink control information, where the sending unit 101 is specifically configured to: in the first transmission attribute and the second transmission attribute Not simultaneously, according to the second transmission attribute, in the second subframe of the first HARQ process The second terminal retransmits the service data.

The first subframe and the second subframe are uplink subframes in the first HARQ process, and the first subframe and the second subframe are separated by at least one processing delay. The processing delay indicates the length of time required for the terminal to parse the downlink control information.

Optionally, the monitoring unit 102 is configured to: in the first time domain resource of the first subframe of the first HARQ process, listen to the downlink control information, where the sending unit 101 is specifically configured to use the first transmission attribute. And when the second transmission attribute is the same, the service data is retransmitted according to the second transmission attribute in the second time domain resource of the first subframe.

Optionally, the terminal 10 further includes a receiving unit 103, configured to receive NACK information sent by the second terminal in the first HARQ process, where the NACK information is used to indicate that the second terminal is not correctly received. The business data.

Further, the sending unit 101 is further configured to: when the monitoring unit 102 does not monitor the downlink control information sent by the base station in the first time domain resource of the first subframe of the first HARQ process, according to the A transmission attribute retransmits the service data to the second terminal in the second time domain resource of the first subframe.

It should be noted that each unit described above may perform the data transmission method shown in the foregoing method embodiment corresponding to the first terminal, and those skilled in the art may clearly understand that the units described above are convenient and concise for the description. For the specific working process, reference may be made to the corresponding content in the foregoing method embodiments, and details are not described herein again.

The embodiment of the present invention provides another terminal 11, as shown in FIG. 11, the terminal 11 includes: a sending unit 111 and a receiving unit 112;

The sending unit 111 is configured to: when the receiving unit 112 does not correctly receive the service data that is sent by the first terminal according to the first transmission attribute in the first HARQ process, send the NACK information to the base station in the first HARQ process.

The NACK information is used to indicate that the terminal does not correctly receive the service data.

It is worth noting that there may be multiple reasons why the terminal does not correctly receive the service data, for example, The transmit power of the service data sent by the first terminal is too low, so that the terminal does not receive the service data, or the terminal receives the service data, but the decoding of the service data fails.

The receiving unit 112 is configured to receive, in the first HARQ process, the service data that is retransmitted by the first terminal according to the second transmission attribute.

For example, the first HARQ process shown in FIG. 3 is used as an example. After the terminal does not correctly receive the service data sent by the first terminal in the subframe 0 of the first HARQ process, the terminal may be the third in the subframe 4. The time domain resource sends the NACK information to the base station. After the base station determines that the terminal does not correctly receive the service data according to the NACK information, the base station may send the downlink control to the first terminal in the first time domain resource of the subframe 8. Information, the downlink control field is used to indicate that the first terminal retransmits the second transmission attribute of the service data, and further, the first terminal may retransmit the first terminal to the first terminal according to the second transmission attribute. Business data.

When the terminal does not correctly receive the service data, the terminal sends the NACK information to the base station, so that the base station can send the downlink control information to adjust the transmission attribute of the first terminal to retransmit the service data, so that the service data is occupied. The resource or data format is suitable for the current transmission environment, thereby facilitating the correct reception of the terminal and improving the efficiency of data retransmission.

Optionally, the receiving unit 112 is further configured to receive the downlink control information that is sent by the base station in the first HARQ process, where the downlink control information is used to indicate a second transmission attribute of the service data.

That is, the base station sends the downlink control information to the first terminal and the terminal simultaneously in the first HARQ process, so that the first terminal retransmits the service according to the second transmission attribute indicated by the downlink control information. Data, the terminal may determine, according to the second transmission attribute indicated by the downlink control information, which subframe of the first HARQ process the first terminal performs data retransmission, so that the terminal only needs the subframe Obtaining the number of services retransmitted by the first terminal by performing monitoring According to the method, no blind detection is performed on each subframe of the first HARQ process, which reduces the overhead of receiving the service data by the terminal.

Optionally, the terminal 11 further includes a channel measurement unit 113, where the receiving unit 112 is further configured to receive a sounding reference signal SRS sent by the first terminal in the first HARQ process, where the channel measurement unit 113 is configured to: The channel state information CSI is obtained according to the SRS, and the sending unit 111 is further configured to send the CSI to the base station in the first HARQ process, where the CSI is used by the base station to determine the at least according to the CSI. Downstream control information.

In this way, the base station can adjust the transmission attribute of the service data according to the CSI of the current transmission channel, so that the resource or data format occupied by the service data is suitable for the current transmission environment, thereby facilitating the correct reception of the terminal and improving the data retransmission. effectiveness.

It should be noted that each unit described above may perform the data transmission method shown in the foregoing method embodiment corresponding to the second terminal, and those skilled in the art may clearly understand that the units described above are convenient and concise for the description. For the specific working process, reference may be made to the corresponding content in the foregoing method embodiments, and details are not described herein again.

The embodiment of the present invention further provides a base station 12. As shown in FIG. 12, the base station 12 includes:

The receiving unit 121 is configured to receive NACK information sent by the second terminal in the first HARQ process.

The sending unit 122 is configured to send downlink control information to the first terminal in the first HARQ process, where the downlink control information is used to indicate a second transmission attribute of the service data.

The second transmission attribute is used by the first terminal to retransmit the service data to the second terminal in the first HARQ process.

For example, the base station may send downlink control information indicating the first transmission attribute of the initial service data to the first terminal, so that after the first terminal sends the service data in the first HARQ process according to the first transmission attribute, If the second terminal correctly receives the service data, then the first The HARQ process sends an ACK message to the base station to notify the base station that the second terminal has correctly received the service data. If the second terminal does not correctly receive the service data, the second terminal sends the NACK information in the first HARQ process. In this way, after determining that the second terminal does not correctly receive the service data, the base station may send the downlink control information to the first terminal, and adjust the transmission attribute of the first terminal to retransmit the service data.

The base station can use the downlink control information to adjust the transmission attribute of the retransmission service data of the first terminal, so that the resource or data format occupied by the service data is suitable for the current transmission environment, thereby facilitating the correctness of the second terminal. Receive, improving the efficiency of data retransmission.

Optionally, the base station 12 further includes a determining unit 123, where the receiving unit 121 is further configured to receive channel state information CSI sent by the second terminal in the first HARQ process, where the determining unit 123 is configured to: at least according to the The CSI determines the downlink control information.

It should be noted that the foregoing units may perform the data transmission method shown in the foregoing method embodiment of the corresponding base station, and those skilled in the art may clearly understand that, for the convenience and brevity of the description, the specific units of the foregoing description are specific. For the working process, refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

Another embodiment of the present invention provides a terminal 13. As shown in FIG. 13, the terminal 13 includes:

The transmitter 131 is configured to send, according to the first transmission attribute, the service data to the second terminal in a first hybrid automatic repeat request (HARQ) process;

The receiver 132 is configured to acquire the downlink control information when the downlink control information sent by the base station is monitored in the first HARQ process, where the downlink control information is used to indicate the second of the service data. Transfer attribute

The transmitter 131 is further configured to: retransmit the service data to the second terminal in the first HARQ process according to the second transmission attribute;

Optionally, the receiver 132 is specifically configured to: in a first subframe of the first HARQ process Listening to the downlink control information;

And when the first transmission attribute is different from the second transmission attribute, retransmitting the service data to the second terminal in a second subframe of the first HARQ process according to the second transmission attribute;

Optionally, the receiver 132 is configured to: listen, in the first time domain resource of the first subframe of the first HARQ process, the downlink control information; the first subframe includes multiple time domains. Resource

And when the first transmission attribute is the same as the second transmission attribute, retransmitting the service data in the second time domain resource of the first subframe according to the second transmission attribute.

Optionally, the receiver 132 is further configured to receive non-acknowledgment (NACK) information sent by the second terminal in the first HARQ process, where the NACK information is used to indicate that the second terminal is incorrect. Receiving the business data.

Optionally, the transmitter 131 is further configured to: when the receiver 132 does not monitor the downlink control sent by the base station in the first time domain resource of the first subframe of the first HARQ process And, in the information, retransmitting the service data to the second terminal according to the first transmission attribute in the second time domain resource of the first subframe.

The terminal is configured to adjust the transmission attribute of the service data according to the downlink control information sent by the base station, so that the resource or data format occupied by the service data is adapted to each time before the service data is retransmitted to the second terminal. The current transmission environment, which in turn facilitates the correct reception of the second terminal, improves the efficiency of data retransmission.

A person skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the terminal described above may refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

The embodiment of the present invention provides a terminal 14, as shown in FIG. 14, the terminal 14 includes: a transmitter 141 and a receiver 142;

The transmitter 141 is configured to: when the receiver 142 does not correctly receive the service data that is sent by the first terminal according to the first transmission attribute in the first HARQ process, send the NACK information to the base station in the first HARQ process. The NACK information is used to indicate that the terminal does not correctly receive the service data;

The receiver 142 is configured to receive, in the first HARQ process, the service data that is retransmitted by the first terminal according to the second transmission attribute, where the second transmission attribute is that the first terminal is based on Determining, by the base station, downlink control information sent in the first HARQ process;

Optionally, the receiver 142 is further configured to receive the downlink control information that is sent by the base station in the first HARQ process, where the downlink control information is used to indicate a second transmission attribute of the service data. .

Optionally, the terminal 14 further includes a processor 143, where the receiver 142 is further configured to receive the sounding reference signal SRS sent by the first terminal in the first HARQ process;

The processor 143 is configured to perform channel measurement according to the SRS, to obtain the channel state information CSI;

The transmitter 141 is further configured to send the CSI to the base station in the first HARQ process, where the CSI is used by the base station to determine the downlink control information according to at least the CSI.

When the terminal does not correctly receive the service data, the terminal sends the NACK information to the base station, so that the base station can send the downlink control information to adjust the transmission attribute of the first terminal to retransmit the service data, so that the service data is used. The occupied resource or data format is suitable for the current transmission environment, thereby facilitating the correct reception of the terminal and improving the efficiency of data retransmission.

Another embodiment of the present invention provides a base station 15. As shown in FIG. 15, the base station 15 includes:

The receiver 151 is configured to receive NACK information that is sent by the second terminal in the first HARQ process, where the NACK information is used to indicate that the second terminal does not correctly receive the first terminal that is sent according to the first transmission attribute. Business data;

The transmitter 152 is configured to send downlink control information to the first terminal in the first HARQ process, where the downlink control information is used to indicate a second transmission attribute of the service data, where the second transmission The attribute is used by the first terminal to retransmit the service data to the second terminal in the first HARQ process.

Optionally, the base station 15 further includes a processor 153, where the receiver 151 is further configured to receive channel state information CSI sent by the second terminal in the first HARQ process;

The processor 153 is configured to determine the downlink control information according to at least the CSI.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the foregoing base station can be referred to the corresponding process in the foregoing method embodiments, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The software functional units described above are stored in a storage medium and include instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform portions of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read only memory (English full name: Read-Only Memory, abbreviated as: ROM), a random access memory (English name: Random Access Memory, abbreviated as: RAM), a disk or A variety of media such as optical discs that can store program code.

While the preferred embodiment of the invention has been described, it will be understood that Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A data transmission method, comprising:

Transmitting, by the first terminal, the service data to the second terminal in a first hybrid automatic repeat request (HARQ) process according to the first transmission attribute;

The first terminal acquires the downlink control information when the downlink control information sent by the base station is received by the first terminal in the first HARQ process, where the downlink control information is used to indicate the second transmission of the service data. Attributes;

Retransmitting, by the first terminal, the service data to the second terminal in the first HARQ process according to the second transmission attribute;

The transmission attribute includes at least one of the following information: a resource occupied by the service data, and a data format of the service data.
The method according to claim 1, wherein the first terminal monitors the downlink control information in a first subframe of the first HARQ process;

If the first transmission attribute is different from the second transmission attribute, the first terminal retransmits the service data to the second terminal in the first HARQ process according to the second transmission attribute, including :

Retransmitting, by the first terminal, the service data to the second terminal in a second subframe of the first HARQ process according to the second transmission attribute;

The first subframe and the second subframe are uplink subframes in the first HARQ process, and the first subframe and the second subframe are separated by at least one processing delay. The processing delay indicates a duration required by the first terminal to parse the downlink control information.
The method according to claim 1, wherein the first terminal monitors the downlink control information in a first time domain resource of a first subframe of the first HARQ process; the first subframe Includes multiple time domain resources;

If the first transmission attribute is the same as the second transmission attribute, the first terminal retransmits the service data to the second terminal in the first HARQ process according to the second transmission attribute, including :

The first terminal retransmits the service data in a second time domain resource of the first subframe according to the second transmission attribute.
The method according to claim 1 or 2, further comprising:

The first terminal receives non-acknowledgment (NACK) information sent by the second terminal in the first HARQ process, where the NACK information is used to indicate that the second terminal does not correctly receive the service data.
The method of claim 4, further comprising:

When the first terminal does not listen to the downlink control information sent by the base station in the first time domain resource of the first subframe of the first HARQ process, according to the first transmission attribute, The second time domain resource of one subframe retransmits the service data to the second terminal.
A data transmission method, comprising:

The second terminal sends non-acknowledgement (NACK) information to the first HARQ process when the second terminal does not correctly receive the service data sent by the first terminal according to the first transmission attribute in the first hybrid automatic repeat request (HARQ) process. a base station, where the NACK information is used to indicate that the second terminal does not correctly receive the service data;

Receiving, by the second terminal, the service data that is retransmitted by the first terminal according to the second transmission attribute in the first HARQ process, where the second transmission attribute is that the first terminal is according to the base station Determining downlink control information sent in the first HARQ process;

The transmission attribute includes at least one of the following information: a resource occupied by the service data, and a data format of the service data.
The method of claim 6 further comprising:

The second terminal receives the downlink control information that is sent by the base station in the first HARQ process, and the downlink control information is used to indicate a second transmission attribute of the service data.
The method according to claim 6 or 7, further comprising:

Receiving, by the second terminal, a sounding reference signal (SRS) sent by the first terminal in the first HARQ process;

The second terminal performs channel measurement according to the SRS, to obtain the channel state information. (CSI);

The second terminal sends the CSI to the base station in the first HARQ process, where the CSI is used by the base station to determine the downlink control information according to at least the CSI.
A data transmission method, comprising:

Receiving, by the base station, non-acknowledgement (NACK) information sent by the second terminal in a first hybrid automatic repeat request (HARQ) process, where the NACK information is used to indicate that the second terminal does not correctly receive the first terminal according to the Service data sent by the first transmission attribute;

The base station sends downlink control information to the first terminal in the first HARQ process, where the downlink control information is used to indicate a second transmission attribute of the service data, where the second transmission attribute is used for The first terminal retransmits the service data to the second terminal in the first HARQ process.
The method according to claim 9, wherein before the sending, by the base station, the downlink control information to the first terminal in the first HARQ process, the method further includes:

Receiving, by the base station, channel state information (CSI) sent by the second terminal in the first HARQ process;

Determining, by the base station, the downlink control information according to at least the CSI.
A terminal, comprising:

a sending unit, configured to send, according to the first transmission attribute, a service data to the second terminal in a first hybrid automatic repeat request (HARQ) process;

The monitoring unit is configured to acquire the downlink control information when the downlink control information sent by the base station is monitored in the first HARQ process, where the downlink control information is used to indicate the second transmission of the service data. Attributes;

The sending unit is further configured to: retransmit the service data to the second terminal in the first HARQ process according to the second transmission attribute;

The transmission attribute includes at least one of the following information: a resource occupied by the service data, and a data format of the service data.
The terminal according to claim 11, wherein the monitoring unit is specifically configured to: And detecting, in the first subframe of the first HARQ process, the downlink control information;

The sending unit is specifically configured to: when the first transmission attribute is different from the second transmission attribute, to the second terminal according to the second transmission attribute in a second subframe of the first HARQ process Retransmitting the business data;

The first subframe and the second subframe are uplink subframes in the first HARQ process, and the first subframe and the second subframe are separated by at least one processing delay; The processing delay indicates a duration required by the terminal to parse the downlink control information.
The terminal according to claim 11, wherein the intercepting unit is configured to: monitor, in the first time domain resource of the first subframe of the first HARQ process, the downlink control information; A subframe includes a plurality of time domain resources;

The sending unit is specifically configured to: when the first transmission attribute is the same as the second transmission attribute, retransmit the service according to the second transmission attribute in a second time domain resource of the first subframe. data.
The terminal according to claim 11 or 12, further comprising:

And a receiving unit, configured to receive non-acknowledgment (NACK) information sent by the second terminal in the first HARQ process, where the NACK information is used to indicate that the second terminal does not correctly receive the service data.
The terminal according to claim 14, wherein the sending unit is further configured to: when the listening unit does not listen to the first time domain resource in the first subframe of the first HARQ process, When the downlink control information is sent by the base station, the service data is retransmitted to the second terminal according to the first transmission attribute in the second time domain resource of the first subframe.
A terminal, comprising: a sending unit and a receiving unit;

The sending unit is configured to: when the receiving unit does not correctly receive the service data sent by the first terminal in the first hybrid automatic repeat request (HARQ) process according to the first transmission attribute, in the first HARQ process Sending a non-acknowledgement (NACK) message to the base station, where the NACK information is used to indicate that the terminal does not correctly receive the service data;

The receiving unit is configured to receive, according to the first terminal, the first terminal in the first HARQ process And the second transmission attribute is determined by the first terminal according to the downlink control information sent by the base station in the first HARQ process;

The transmission attribute includes at least one of the following information: a resource occupied by the service data, and a data format of the service data.
The terminal according to claim 16, wherein the receiving unit is further configured to: receive the downlink control information that is sent by the base station in the first HARQ process; and the downlink control information is used to indicate The second transmission attribute of the business data.
The terminal according to claim 16 or 17, further comprising a channel measuring unit;

The receiving unit is further configured to receive a sounding reference signal (SRS) sent by the first terminal in the first HARQ process;

The channel measurement unit is configured to perform channel measurement according to the SRS, to obtain the channel state information (CSI);

The sending unit is further configured to send the CSI to the base station in the first HARQ process, where the CSI is used by the base station to determine the downlink control information according to at least the CSI.
A base station, comprising:

a receiving unit, configured to receive non-acknowledgement (NACK) information sent by the second terminal in a first hybrid automatic repeat request (HARQ) process, where the NACK information is used to indicate that the second terminal does not correctly receive the Service data sent by the first terminal according to the first transmission attribute;

a sending unit, configured to send downlink control information to the first terminal in the first HARQ process, where the downlink control information is used to indicate a second transmission attribute of the service data, where the second transmission attribute Used by the first terminal to retransmit the service data to the second terminal in the first HARQ process.
The base station according to claim 19, further comprising a determining unit;

The receiving unit is further configured to receive channel state information (CSI) sent by the second terminal in the first HARQ process;

The determining unit is configured to determine the downlink control information according to at least the CSI.