WO2018001185A1

WO2018001185A1 - Device-to-device d2d communication method, related device, and system

Info

Publication number: WO2018001185A1
Application number: PCT/CN2017/089809
Authority: WO
Inventors: 张旭; 成艳; 薛丽霞
Original assignee: 华为技术有限公司
Priority date: 2016-06-30
Filing date: 2017-06-23
Publication date: 2018-01-04
Also published as: CN107566096A

Abstract

Disclosed in the embodiments of the present invention are a device-to-device D2D communication method, a related device, and a system, the method comprising: a base station receives a D2D communication link request sent by a transmitting terminal, the D2D communication link request being used for indicating that the transmitting terminal needs to establish a D2D communication link with a receiving terminal; and the base station sends first instruction information to the transmitting terminal, the first instruction information comprising first time-frequency resource information generated by the base station on the basis of the D2D communication link request and used when instructing the receiving end to feed back transmission state information and/or channel state information. Use of the present invention can improve resource utilisation and improve D2D communication efficiency.

Description

Terminal to terminal D2D communication method, related device and system

Technical field

The present invention relates to the field of terminal technologies, and in particular, to a terminal-to-terminal D2D communication method, related device and system.

Background technique

In order to improve system efficiency and resource utilization, when the distance between the terminals is relatively close, the terminals can perform terminal-to-terminal (D2D) communication without forwarding through the base station, and D2D communication is a control at the base station. The technology for allowing direct communication between terminals by multiplexing cell resources, that is, D2D communication is to change the communication mode originally transferred by the base station to direct communication between terminals requiring communication, but the base station still performs D2D communication with the terminal. The terminal maintains the transmission of control information, implements interference control, allocates resources for the D2D terminal, and enables D2D communication to operate in the licensed band.

Since the data between the D2D communication terminals does not need to be transferred by the base station, but the direct transmission between the terminals, the burden of communication of the base station is reduced, the occupied communication resources are saved, and the D2D terminal can communicate with the normal cellular communication. Cellular users reuse time-frequency resources, which greatly improves communication rate and frequency efficiency, and solves the problem of lack of spectrum resources in wireless communication systems to some extent. In addition, the power consumption of the D2D terminal can be saved. However, in the existing D2D communication system, after the transmitting end and the receiving end establish a D2D communication connection, the transmitting end transmits the D2D data information to the receiving end, and then repeatedly transmits the D2D data information three times in total, and sends a total of four times. After the D2D data information, the D2D transmission is terminated. This transmission mechanism may cause redundancy of transmission information and waste of system spectrum resources, and ultimately lead to a decrease in D2D communication efficiency.

Summary of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a terminal-to-terminal D2D communication method, related device and system, and the present invention can solve the redundant transmission technology that may exist in a base station or a transmitting end in the existing D2D communication. Problem, improve resource utilization.

In a first aspect, an embodiment of the present invention provides a terminal-to-terminal D2D communication method, which may include:

Receiving, by the base station, a D2D communication connection request sent by the transmitting end, where the D2D communication connection request is used to indicate that the transmitting end needs to establish a D2D communication connection with the receiving end;

Transmitting, by the base station, first indication information to the transmitting end, where the first indication information includes, when the base station generates, according to the D2D communication connection request, the receiving end feedbacks transmission state information and/or channel state information. The first time-frequency resource information used.

With reference to the first aspect, in a first possible implementation manner, after the sending, by the base station, the first indication information to the transmitting end, the method further includes:

The base station receives, according to the first time-frequency resource information, transmission state information and/or channel state information that is fed back by the receiving end at a specified time-frequency resource location, where the transmission state information includes ACK or NACK information.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, the base station, according to the first time-frequency resource information, receives a transmission state that is fed back by the receiving end at a specified time-frequency resource location. After the information, also include:

The base station sends the second indication information to the transmitting end, where the second indication information includes a new data indication signaling NDI generated by the base station according to the transmission status information or the channel state information, where the NDI is used. Instructing the transmitting end to determine whether to perform retransmission of the current data packet according to the value of the NDI.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation, the second indication information further includes that the base station generates the information according to the transmission state information and/or channel state information. The transmitting end and the receiving end perform updated time-frequency resource information for D2D communication.

In combination with the first aspect, or in combination with the first possible implementation of the first aspect, or in combination with the second possible implementation of the first aspect, or in combination with the third possible implementation of the first aspect, In a fourth possible implementation, the sending, by the base station, the first indication information to the transmitting end includes:

The base station carries the first indication information by using downlink control information or high layer signaling, and sends the first indication information to the transmitting end.

In combination with the first aspect, or in combination with the first possible implementation of the first aspect, or in combination with the second possible implementation of the first aspect, or in combination with the third possible implementation of the first aspect, In a fifth possible implementation manner, the sending, by the base station, the first indication information to the transmitting end includes:

The base station carries the first indication information by using an information field in the downlink control information, and sends the first indication information to the transmitting end.

In combination with the first aspect, or in combination with the first possible implementation of the first aspect, or in combination with the second possible implementation of the first aspect, or in combination with the third possible implementation of the first aspect, or In conjunction with the fourth possible implementation of the first aspect, or in combination with the fifth possible implementation of the first aspect, in a sixth possible implementation, the first indication information further includes the base station And the second time-frequency resource information that is sent by the transmitting end and the receiving end to perform D2D communication according to the D2D communication connection request.

In combination with the first aspect, or in combination with the first possible implementation of the first aspect, or in combination with the second possible implementation of the first aspect, or in combination with the third possible implementation of the first aspect, or In combination with the fourth possible implementation of the first aspect, or in combination with the fifth possible implementation of the first aspect, or in combination with the sixth possible implementation of the first aspect, in a seventh possible In an implementation manner, the first time-frequency resource information includes a time domain resource location and frequency domain resource location information determined by the base station according to the D2D communication connection request.

In combination with the first aspect, or in combination with the first possible implementation of the first aspect, or in combination with the second possible implementation of the first aspect, or in combination with the third possible implementation of the first aspect, or In combination with the fourth possible implementation of the first aspect, or in combination with the fifth possible implementation of the first aspect, or in combination with the sixth possible implementation of the first aspect, in the eighth possible In an implementation manner, the first time-frequency resource information includes a frequency domain resource location and a time domain resource location indication determined by the base station according to the D2D communication connection request, where the time domain resource location indication is used to indicate a time domain resource location. The pre-agreed time domain resource location.

With reference to the eighth possible implementation manner of the first aspect, in a ninth possible implementation manner, the time domain resource location in which the transmitting end performs D2D communication with the receiving end is an nth subframe; The time domain resource location is the n+k subframe in the uplink transmission link of the receiving end, where n and k are both positive integers.

In combination with the first aspect, or in combination with the first possible implementation of the first aspect, or in combination with the second possible implementation of the first aspect, or in combination with the third possible implementation of the first aspect, or In combination with the fourth possible implementation of the first aspect, or in combination with the fifth possible implementation of the first aspect, or in combination with the sixth possible implementation of the first aspect, or in combination with the first aspect The seventh possible implementation, or In combination with the eighth possible implementation of the first aspect, or in combination with the ninth possible implementation of the first aspect, in the tenth possible implementation, the first indication information further includes an indication Whether the receiving end needs to perform information of transmission status information and/or channel status information feedback.

In a second aspect, an embodiment of the present invention provides a terminal-to-terminal D2D communication method, which may include:

The transmitting end sends a D2D communication connection request to the base station, where the D2D communication connection request is used to indicate that the transmitting end needs to establish a D2D communication connection with the receiving end;

The transmitting end receives the first indication information that is sent by the base station, where the first indication information includes first time-frequency resource information used when the receiving end feeds back the transmission status information and/or the channel status information, where the transmission status is The information includes ACK or NACK information;

The transmitting end sends D2D control information to the receiving end, where the D2D control information includes the first time-frequency resource information.

With reference to the second aspect, in a first possible implementation, the first indication information further includes, by the base station, the second end of the D2D communication between the transmitting end and the receiving end generated by the D2D communication connection request Time-frequency resource information; the D2D control information further includes the second time-frequency resource information.

With reference to the first possible implementation of the second aspect, in a second possible implementation, after the transmitting end sends the D2D control information to the receiving end, the method further includes:

The transmitting end performs D2D data transmission with the transmitting end on the specified time-frequency resource according to the second time-frequency resource information.

With reference to the second aspect, or in combination with the first possible implementation of the second aspect, or in combination with the second possible implementation of the second aspect, in a third possible implementation, the transmitting end After the receiving end sends the D2D control information, the method further includes:

The transmitting end receives the second indication information sent by the base station, where the second indication information is generated by the base station according to the received transmission status information or channel state information fed back by the receiving end, where the transmission status information includes ACK or NACK information, the second indication information includes a new data indication signaling NDI generated by the base station according to the ACK or NACK information;

The transmitting end determines whether to perform retransmission of the current data packet according to the value of the NDI.

In conjunction with the third possible implementation of the second aspect, in a fourth possible implementation, the transmitting end determines whether to perform data retransmission according to the value of the NDI, including:

Determining whether the value of the NDI is inverted;

If it is flipped, the current transmission buffer is cleared, and a new data packet is transmitted;

If not flipped, the current packet is retransmitted.

With reference to the third possible implementation manner of the second aspect, in a fifth possible implementation, the second indication information further includes that the base station generates the information according to the transmission state information and/or channel state information. The transmitting end and the receiving end perform updated time-frequency resource information for D2D communication.

In conjunction with the first possible implementation of the second aspect, or in combination with the fifth possible implementation of the second aspect, in a sixth possible implementation, the transmitting end performs D2D communication with the receiving end. The time domain resource location is the nth subframe; the transmitting end passes the orthogonal frequency division used on the nth subframe different from the D2D communication The uplink and downlink transmissions are performed with OFDM symbols of OFDM symbols, where n is a positive integer.

With reference to the second aspect, or in combination with the first possible implementation of the second aspect, or in combination with the second possible implementation of the second aspect, or in combination with the third possible implementation of the second aspect, or In combination with the fourth possible implementation of the second aspect, or in combination with the fifth possible implementation of the second aspect, or in combination with the sixth possible implementation of the second aspect, in a seventh possible In an implementation manner, the first time-frequency resource information includes a time domain resource location and frequency domain resource location information determined by the base station according to the D2D communication connection request.

With reference to the second aspect, or in combination with the first possible implementation of the second aspect, or in combination with the second possible implementation of the second aspect, or in combination with the third possible implementation of the second aspect, or In combination with the fourth possible implementation of the second aspect, or in combination with the fifth possible implementation of the second aspect, or in combination with the sixth possible implementation of the second aspect, in the eighth possible In an implementation manner, the first time-frequency resource information includes a frequency domain resource location and a time domain resource location indication determined by the base station according to the D2D communication connection request, where the time domain resource location indication is used to indicate a time-frequency resource location. It is a pre-agreed time-frequency resource location.

With reference to the eighth possible implementation of the second aspect, in a ninth possible implementation, the time domain resource location of the D2D communication between the transmitting end and the receiving end is an nth subframe; The time domain resource location is the n+k subframe in the uplink transmission link of the receiving end, where n and k are both positive integers.

With reference to the second aspect, or in combination with the first possible implementation of the second aspect, or in combination with the second possible implementation of the second aspect, or in combination with the third possible implementation of the second aspect, or In combination with the fourth possible implementation of the second aspect, or in combination with the fifth possible implementation of the second aspect, or in combination with the sixth possible implementation of the second aspect, or in combination with the second aspect The seventh possible implementation manner, or the eighth possible implementation manner of the second aspect, or the ninth possible implementation manner of the second aspect, in the tenth possible implementation manner, Transmitting, by the transmitting end, D2D control information to the receiving end, including:

The transmitting end sends D2D control information to the receiving end at a preset time-frequency resource location, where the preset time-frequency resource location is configured by the base station by using high-layer signaling.

In a third aspect, an embodiment of the present invention provides a terminal-to-terminal D2D communication method, which may include:

The receiving end receives the D2D control information sent by the transmitting end, where the D2D control information includes first time-frequency resource information used when the receiving end feeds back the transmission status information and/or the channel status information;

The receiving end sends transmission state information and/or channel state information to the base station on the specified time-frequency resource according to the first time-frequency resource information, where the transmission state information and/or channel state information is used by the base station according to the The transmission status information or channel status information indicates that the transmitting end performs retransmission of the current data packet, or clears the current transmission buffer and performs transmission of a new data packet, where the transmission status information includes ACK or NACK information.

With reference to the third aspect, in a first possible implementation manner, the receiving end sends the transmission state information and/or the channel state information to the base station on the specified time-frequency resource according to the first time-frequency resource information, including:

The receiving end feeds back the transmission state information and/or the channel state information to the base station at the specified time-frequency resource location in the uplink control information according to the first time-frequency resource information and the acquired preset system frame structure.

With reference to the third aspect, or in combination with the first possible implementation manner of the third aspect, in a second possible implementation, the D2D control information further includes that the transmitting end performs D2D communication with the receiving end. Second time-frequency resource information.

With reference to the third aspect, or in combination with the first possible implementation manner of the third aspect, in a third possible implementation, the D2D control information further includes the base station according to the transmission state information and/or channel The transmitting end generates the updated time-frequency resource information for D2D communication between the transmitting end and the receiving end.

In conjunction with the second possible implementation of the third aspect, or in combination with the third possible implementation of the third aspect, in a fourth possible implementation, the transmitting end performs D2D communication with the receiving end. The time domain resource location is an nth subframe; the receiving end performs uplink and downlink by using an OFDM symbol different from the orthogonal frequency division multiplexing OFDM symbol used in the D2D communication on the nth subframe The transmission of a link, where n is a positive integer. It should be noted that the nth subframe in the embodiment of the present invention refers to a specific frame in a specific resource period, but refers to a subframe at the same position in any one of the time domain resource periods.

In conjunction with the second possible implementation of the third aspect, or in combination with the third possible implementation of the third aspect, in a fifth possible implementation, the transmitting end performs D2D communication with the receiving end. The time domain resource location is located in the n0th subframe and the n2th subframe; the receiving end transmits the transmission state information and/or the channel state information to the base station at the nth subframe position, where The n1th subframe is located between the n0th subframe and the n2th subframe in the time domain, and the resource for performing D2D data communication is not included between the n0th subframe and the n2th subframe. The n0, n1 and n2 are positive integers.

With reference to the third aspect, in a sixth possible implementation, the time domain resource location in the first time-frequency resource information is the m-th subframe; the receiving end is different from the m-th subframe The OFDM symbols of the orthogonal frequency division multiplexing OFDM symbols corresponding to the time domain resource locations in the first time-frequency resource information are uplink and downlink, where m is a positive integer.

With reference to the third aspect, or in combination with the first possible implementation of the third aspect, or in combination with the second possible implementation of the third aspect, or in combination with the third possible implementation of the third aspect, or In combination with the fourth possible implementation of the third aspect, or in combination with the fifth possible implementation of the third aspect, or in combination with the sixth possible implementation of the third aspect, in the seventh possible In an implementation manner, the first time-frequency resource information includes a time domain resource location and frequency domain resource location information determined by the base station according to the D2D communication connection request.

With reference to the third aspect, or in combination with the first possible implementation of the third aspect, or in combination with the second possible implementation of the third aspect, or in combination with the third possible implementation of the third aspect, or In combination with the fourth possible implementation of the third aspect, or in combination with the fifth possible implementation of the third aspect, or in combination with the sixth possible implementation of the third aspect, in the eighth possible In an implementation manner, the first time-frequency resource information includes a frequency domain resource location and a time domain resource location indication determined by the base station according to the D2D communication connection request, where the time domain resource location is used to indicate that the time-frequency resource location is Pre-agreed time-frequency resource location.

With reference to the eighth possible implementation manner of the third aspect, in a ninth possible implementation manner, the time domain resource location of the D2D communication between the transmitting end and the receiving end is an nth subframe; the pre-agreed time The domain resource location is the n+k subframe in the uplink transmission link of the receiving end, where n and k are both positive integers.

In a fourth aspect, an embodiment of the present invention provides a base station, which may include: an input unit, an output unit, a storage unit, and a processing unit;

The storage unit is configured to store program code, and the processing unit is configured to invoke the program code stored by the storage unit to perform the following steps:

Receiving, by the input unit, a D2D communication connection request sent by the transmitting end, where the D2D communication connection request is used to indicate that the transmitting end needs to establish a D2D communication connection with the receiving end;

Sending, by the output unit, the first indication information to the transmitting end, where the first indication information includes the indication, by the base station, that the receiving end sends feedback status information and/or channel status information according to the D2D communication connection request. The first time-frequency resource information used at the time.

In conjunction with the fourth aspect, in a first possible implementation, the processing unit is further configured to:

After the first indication information is sent to the transmitting end by the output unit, the transmission state information and/or channel state information fed back by the receiving end is received at the specified time-frequency resource location according to the first time-frequency resource information. The transmission status information includes ACK or NACK information.

In conjunction with the first possible implementation of the fourth aspect, in a second possible implementation, the processing unit is further configured to:

After receiving, by the input unit, the transmission status information fed back by the receiving end by using the first time-frequency resource information, sending, by the output unit, second indication information to the transmitting end, The second indication information includes a new data indication signaling NDI generated by the base station according to the transmission status information or the channel state information, where the NDI is used to indicate that the transmitting end determines whether to perform current data according to the value of the NDI. Retransmission of the package.

With reference to the second possible implementation manner of the fourth aspect, in a third possible implementation, the second indication information further includes that the base station generates the information according to the transmission state information and/or channel state information. The transmitting end and the receiving end perform updated time-frequency resource information for D2D communication.

With reference to the fourth aspect, or in combination with the first possible implementation of the fourth aspect, or in combination with the second possible implementation of the fourth aspect, or in combination with the third possible implementation of the fourth aspect, In a fourth possible implementation manner, the processing unit is configured to send the first indication information to the transmitting end by using the output unit, specifically:

And transmitting, by the output unit, the first indication information by using downlink control information or high layer signaling, and sending the first indication information to the transmitting end.

With reference to the fourth aspect, or in combination with the first possible implementation of the fourth aspect, or in combination with the second possible implementation of the fourth aspect, or in combination with the third possible implementation of the fourth aspect, In a fifth possible implementation, the processing unit is configured to send the first indication information to the transmitting end by using the output unit, including:

And transmitting, by the output unit, the first indication information by using an information field in the downlink control information, and sending the first indication information to the transmitting end.

With reference to the fourth aspect, or in combination with the first possible implementation of the fourth aspect, or in combination with the second possible implementation of the fourth aspect, or in combination with the third possible implementation of the fourth aspect, or In conjunction with the fourth possible implementation of the fourth aspect, or in combination with the fifth possible implementation of the fourth aspect, in a sixth possible implementation, the first indication information further includes the base station And the second time-frequency resource information that is sent by the transmitting end and the receiving end to perform D2D communication according to the D2D communication connection request.

With reference to the fourth aspect, or in combination with the first possible implementation of the fourth aspect, or in combination with the second possible implementation of the fourth aspect, or in combination with the third possible implementation of the fourth aspect, or In combination with the fourth possible implementation of the fourth aspect, or in combination with the fifth possible implementation of the fourth aspect, or With the sixth possible implementation of the fourth aspect, in a seventh possible implementation, the first time-frequency resource information includes a time domain resource location and frequency determined by the base station according to the D2D communication connection request Domain resource location information.

With reference to the fourth aspect, or in combination with the first possible implementation of the fourth aspect, or in combination with the second possible implementation of the fourth aspect, or in combination with the third possible implementation of the fourth aspect, or In combination with the fourth possible implementation of the fourth aspect, or in combination with the fifth possible implementation of the fourth aspect, or in combination with the sixth possible implementation of the fourth aspect, in the eighth possible In an implementation manner, the first time-frequency resource information includes a frequency domain resource location and a time domain resource location indication determined by the base station according to the D2D communication connection request, where the time domain resource location indication is used to indicate a time domain resource location. The pre-agreed time domain resource location.

With reference to the eighth possible implementation of the fourth aspect, in a ninth possible implementation, the time domain resource location of the D2D communication between the transmitting end and the receiving end is an nth subframe; The time domain resource location is the n+k subframe in the uplink transmission link of the receiving end, where n and k are both positive integers.

With reference to the fourth aspect, or in combination with the first possible implementation of the fourth aspect, or in combination with the second possible implementation of the fourth aspect, or in combination with the third possible implementation of the fourth aspect, or In combination with the fourth possible implementation of the fourth aspect, or in combination with the fifth possible implementation of the fourth aspect, or in combination with the sixth possible implementation of the fourth aspect, or in combination with the fourth aspect The seventh possible implementation manner, or the eighth possible implementation manner of the fourth aspect, or the ninth possible implementation manner of the fourth aspect, in the tenth possible implementation manner, The first indication information further includes information indicating whether the receiving end needs to perform transmission status information and/or channel status information feedback.

In a fifth aspect, an embodiment of the present invention provides a terminal device, where the terminal device is a transmitting end, and may include: an input unit, an output unit, a storage unit, and a processing unit;

Sending, by the output unit, a D2D communication connection request to the base station, where the D2D communication connection request is used to indicate that the transmitting end needs to establish a D2D communication connection with the receiving end;

And receiving, by the input unit, first indication information that is sent by the base station, where the first indication information includes first time-frequency resource information used when the receiving end feeds back the transmission status information and/or the channel status information, where the transmission Status information includes ACK or NACK information;

And transmitting, by the output unit, D2D control information to the receiving end, where the D2D control information includes the first time-frequency resource information.

With reference to the fifth aspect, in a first possible implementation manner, the first indication information further includes a second time that the base station performs D2D communication with the receiving end by the transmitting end according to the D2D communication connection request. Frequency resource information; the D2D control information further includes the second time-frequency resource information.

In conjunction with the first possible implementation of the fifth aspect, in a second possible implementation, the processing unit is further configured to:

After the D2D control information is sent to the receiving end by the output unit, D2D data transmission is performed with the transmitting end on the specified time-frequency resource according to the second time-frequency resource information.

In combination with the fifth aspect, or in combination with the first possible implementation of the fifth aspect, or A second possible implementation manner, in a third possible implementation manner, the processing unit is further configured to:

After the D2D control information is sent to the receiving end by the output unit, the second indication information sent by the base station is received by the input unit, where the second indication information is sent by the base station according to the receiving end. The transmission status information or the channel status information is generated, the transmission status information includes ACK or NACK information, and the second indication information includes a new data indication signaling NDI generated by the base station according to the ACK or NACK information; The value of the NDI determines whether to retransmit the current packet.

With reference to the third possible implementation manner of the fifth aspect, in a fourth possible implementation, the method is used to determine whether to perform data retransmission according to the value of the NDI, specifically:

Determining whether the value of the NDI is inverted;

If not flipped, the current packet is retransmitted.

With reference to the third possible implementation manner of the fifth aspect, in a fifth possible implementation, the second indication information further includes that the base station generates the information according to the transmission state information and/or channel state information. The transmitting end and the receiving end perform updated time-frequency resource information for D2D communication.

In conjunction with the first possible implementation of the fifth aspect, or in combination with the fifth possible implementation of the fifth aspect, in a sixth possible implementation, the transmitting end performs D2D communication with the receiving end. The time domain resource location is an nth subframe; the transmitting end performs uplink and downlink by using an OFDM symbol different from the orthogonal frequency division multiplexing OFDM symbol used in the D2D communication on the nth subframe The transmission of a link, where n is a positive integer.

With reference to the fifth aspect, or in combination with the first possible implementation of the fifth aspect, or in combination with the second possible implementation of the fifth aspect, or in combination with the third possible implementation of the fifth aspect, or In combination with the fourth possible implementation of the fifth aspect, or in combination with the fifth possible implementation of the fifth aspect, or in combination with the sixth possible implementation of the fifth aspect, in the seventh possible In an implementation manner, the first time-frequency resource information includes a time domain resource location and frequency domain resource location information determined by the base station according to the D2D communication connection request.

With reference to the fifth aspect, or in combination with the first possible implementation of the fifth aspect, or in combination with the second possible implementation of the fifth aspect, or in combination with the third possible implementation of the fifth aspect, or In combination with the fourth possible implementation of the fifth aspect, or in combination with the fifth possible implementation of the fifth aspect, or in combination with the sixth possible implementation of the fifth aspect, in the eighth possible In an implementation manner, the first time-frequency resource information includes a frequency domain resource location and a time domain resource location indication determined by the base station according to the D2D communication connection request, where the time domain resource location indication is used to indicate a time-frequency resource location. It is a pre-agreed time-frequency resource location.

With reference to the eighth possible implementation manner of the fifth aspect, in a ninth possible implementation manner, the time domain resource location of the D2D communication between the transmitting end and the receiving end is an nth subframe; The time domain resource location is the n+k subframe in the uplink transmission link of the receiving end, where n and k are both positive integers.

With reference to the fifth aspect, or in combination with the first possible implementation of the fifth aspect, or in combination with the second possible implementation of the fifth aspect, or in combination with the third possible implementation of the fifth aspect, or The fourth possible implementation manner of the fifth aspect, or the fifth possible implementation manner of the fifth aspect, or the sixth possible implementation manner of the fifth aspect, or the fifth aspect The seventh possible implementation manner, or the eighth possible implementation manner of the fifth aspect, or the ninth possible implementation manner of the fifth aspect, in the tenth possible implementation manner, a processing unit, configured to send to the receiving end by using the output unit Send D2D control information, specifically:

The D2D control information is sent to the receiving end by using the output unit at a preset time-frequency resource location, where the preset time-frequency resource location is configured by the base station by using high-layer signaling.

In a sixth aspect, an embodiment of the present invention provides a terminal device, where the terminal device is a receiving end, and may include: an input unit, an output unit, a storage unit, and a processing unit;

Receiving D2D control information sent by the transmitting end by using the input unit, where the D2D control information includes first time-frequency resource information used when the receiving end feeds back the transmission state information and/or the channel state information;

Transmitting transmission state information and/or channel state information to the base station by using the output unit on the specified time-frequency resource according to the first time-frequency resource information, where the transmission state information and/or channel state information is used by the base station And transmitting, according to the transmission state information or the channel state information, the transmitting end to retransmit the current data packet, or clearing the current transmission buffer and performing transmission of a new data packet, where the transmission state information includes ACK or NACK information.

With reference to the sixth aspect, in a first possible implementation, the processing unit is configured to send, by using the output unit, the transmission status information to the base station on the specified time-frequency resource according to the first time-frequency resource information, and / or channel status information, specifically:

And transmitting, by the output unit, the transmission status information and/or the channel status information to the base station at the specified time-frequency resource position in the uplink control information according to the first time-frequency resource information and the acquired preset system frame structure. .

With reference to the sixth aspect, or in combination with the first possible implementation manner of the sixth aspect, in a second possible implementation, the D2D control information further includes that the transmitting end performs D2D communication with the receiving end. Second time-frequency resource information.

With reference to the sixth aspect, or in combination with the first possible implementation manner of the sixth aspect, in a third possible implementation, the D2D control information further includes the base station according to the transmission state information and/or channel The transmitting end generates the updated time-frequency resource information for D2D communication between the transmitting end and the receiving end.

In conjunction with the second possible implementation of the sixth aspect, or in combination with the third possible implementation of the sixth aspect, in a fourth possible implementation, the transmitting end performs D2D communication with the receiving end. The time domain resource location is an nth subframe; the receiving end performs uplink and downlink by using an OFDM symbol different from the orthogonal frequency division multiplexing OFDM symbol used in the D2D communication on the nth subframe The transmission of a link, where n is a positive integer.

In conjunction with the second possible implementation of the sixth aspect, or in combination with the third possible implementation of the sixth aspect, in a fifth possible implementation, the transmitting end performs D2D communication with the receiving end. The time domain resource location is located in the n0th subframe and the n2th subframe; the receiving end transmits the transmission state information and/or the channel state information to the base station at the nth subframe position, where The n1th subframe is located between the n0th subframe and the n2th subframe in the time domain, and the resource for performing D2D data communication is not included between the n0th subframe and the n2th subframe. The n0, n1, and n2 are positive integers.

With reference to the sixth aspect, in a sixth possible implementation, the time domain resource location in the first time-frequency resource information is the m-th subframe; the receiving end is different from the m-th subframe OFDM symbols of orthogonal frequency division multiplexing OFDM symbols corresponding to time domain resource locations in the first time-frequency resource information are uplink and downlink transmitted Lose, where m is a positive integer.

With reference to the sixth aspect, or in combination with the first possible implementation of the sixth aspect, or in combination with the second possible implementation of the sixth aspect, or in combination with the third possible implementation of the sixth aspect, or In combination with the fourth possible implementation of the sixth aspect, or in combination with the fifth possible implementation of the sixth aspect, or in combination with the sixth possible implementation of the sixth aspect, in the seventh possible In an implementation manner, the first time-frequency resource information includes a time domain resource location and frequency domain resource location information determined by the base station according to the D2D communication connection request.

With reference to the sixth aspect, or in combination with the first possible implementation of the sixth aspect, or in combination with the second possible implementation of the sixth aspect, or in combination with the third possible implementation of the sixth aspect, or In combination with the fourth possible implementation of the sixth aspect, or in combination with the fifth possible implementation of the sixth aspect, or in combination with the sixth possible implementation of the sixth aspect, in the eighth possible In an implementation manner, the first time-frequency resource information includes a frequency domain resource location and a time domain resource location indication determined by the base station according to the D2D communication connection request, where the time domain resource location is used to indicate that the time-frequency resource location is Pre-agreed time-frequency resource location.

With reference to the eighth possible implementation manner of the sixth aspect, in a ninth possible implementation, the time domain resource location of the D2D communication between the transmitting end and the receiving end is an nth subframe; the pre-agreed time The domain resource location is the n+k subframe in the uplink transmission link of the receiving end, where n and k are both positive integers.

In a seventh aspect, an embodiment of the present invention provides a terminal-to-terminal D2D communication system, which may include: a base station, a transmitting end, and a receiving end, where

The base station is the base station that is combined with any implementation of the fourth aspect;

The transmitting end is the transmitting end that is combined with any implementation of the fifth aspect;

The receiving end is the receiving end that combines any implementation manner of the sixth aspect.

Embodiments of the present invention have the following beneficial effects:

In the embodiment of the present invention, the D2D communication connection request sent by the transmitting end is received by the base station, where the D2D communication connection request is used to indicate that the transmitting end needs to establish a D2D communication connection with the receiving end; and the base station sends the first to the transmitting end. Instructing information, the first indication information includes first time-frequency resource information used by the base station according to the D2D communication connection request to indicate that the receiving end feeds back transmission state information and/or channel state information. That is, in the D2D communication mode, the transmission state information feedback back-transmission mechanism of the receiving end is introduced, so that the base station can instruct the transmitting end to stop redundant transmission according to the transmission state information and/or channel state information, improve resource utilization, and improve D2D communication. effectiveness.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic structural diagram of a D2D communication network according to an embodiment of the present invention;

2 is a flowchart of D2D information transmission according to an embodiment of the present invention;

3 is a schematic flowchart of a terminal-to-terminal D2D communication method according to an embodiment of the present invention;

4 is a schematic diagram of resource time division multiplexing according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of resource time division multiplexing according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic structural diagram of a D2D data transmission frame according to an embodiment of the present disclosure;

FIG. 7 is a schematic flowchart of another terminal-to-terminal D2D communication method according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of time division multiplexing of uplink control information resources according to an embodiment of the present invention; FIG.

FIG. 9 is a timing diagram of feedback of a D2D receiving end according to an embodiment of the present invention; FIG.

10 is a schematic structural diagram of a base station provided by the present invention;

11 is a schematic structural view of a transmitting end provided by the present invention;

12 is a schematic structural diagram of a receiving end provided by the present invention;

FIG. 13 is a schematic structural diagram of a terminal-to-terminal D2D communication system provided by the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all 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.

The terms "first", "second", "third", and "fourth" and the like in the specification and claims of the present invention are used to distinguish different objects, and are not intended to describe a specific order. . Furthermore, the terms "comprises" and "comprising" and "comprising" are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or alternatively Other steps or units inherent to these processes, methods, products or equipment.

References to "an embodiment" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the invention. The appearances of the phrases in various places in the specification are not necessarily referring to the same embodiments, and are not exclusive or alternative embodiments that are mutually exclusive. Those skilled in the art will understand and implicitly understand that the embodiments described herein can be combined with other embodiments.

Hereinafter, some of the terms in the present application will be explained to be understood by those skilled in the art.

1) The transmitting end/receiving end can be a User Equipment (UE) with D2D communication function. The UE can be called an access terminal, a terminal device, a subscriber unit, a subscriber station, a mobile station, a mobile station, and a remote location. Station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The UE can be a cellular phone, a cordless phone, a smart phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a smart bracelet, a smart wearable device, an MP3 player (Moving) Picture Experts Group Audio Layer III, dynamic video experts compress standard audio level 3), MP4 (Moving Picture Experts Group Audio Layer IV), player, personal digital assistant (PDA), Handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, in-vehicle devices, and terminal devices in future 5G networks.

2) The base station may be a base station (Base Transceiver Station, BTS) in GSM or CDMA, or a base station (NodeB) in WCDMA, or an evolved base station (Evolutional Node B, eNB or eNodeB) in LTE, or It is a base station device or the like in a future 5G network, and the present invention is not limited thereto.

3) "Multiple" means two or more. "and/or", describing the association relationship of the associated objects, indicating that there may be three relationships, for example, A and/or B, which may indicate that there are three cases where A exists separately, A and B exist at the same time, and B exists separately. The character "/" generally indicates that the contextual object is an "or" relationship.

In order to facilitate the understanding of the embodiments of the present invention, the D2D communication network architecture on which the embodiments of the present invention are based is first described. Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a D2D communication network according to an embodiment of the present invention. The network architecture includes a core network, a base station, a transmitting end, and a receiving end, and the base station is responsible for the D2D connection between the transmitting end and the receiving end. And the communication allocates resources, the transmitting end and the receiving end perform D2D connection according to the resources allocated by the base station, and directly perform D2D communication, wherein the core network mainly provides data support and related services for the D2D communication process. Referring to FIG. 2, FIG. 2 is a flowchart of D2D information transmission according to an embodiment of the present invention. It is to be noted that, in the prior art, after receiving a D2D communication connection request from a transmitting end, the base station sends a downlink control to the transmitting end. Information indicating the time-frequency resources for which D2D communication is performed. Then, after receiving the downlink control information sent by the base station, the transmitting end first sends the D2D control information to the receiving end according to the indication information, where the D2D control information is used to instruct the D2D transmitting end to send the time-frequency resource of the D2D data information. Then, the D2D data information is sent to the receiving end, and then the D2D data information is repeatedly transmitted three times, and the D2D data information is sent four times in total, and the D2D transmission is ended. It should be noted that the data information sent by the transmitting end may be sent to a specific receiving end, or may be sent to multiple specific receiving ends. It is to be understood that the network architecture in FIG. 1 is only one of the preferred embodiments of the present invention. The network architecture in the embodiment of the present invention includes, but is not limited to, the foregoing network architecture.

Embodiments of the present application will be described below with reference to the accompanying drawings.

Referring to FIG. 3, FIG. 3 is a schematic flowchart of a terminal-to-terminal D2D communication method according to an embodiment of the present invention. The terminal control method in the embodiment of the present invention will be described in detail below with reference to FIG. 3 from the transmitting end, the base station, and the receiving side. The method may include the following steps S301 to S309.

Step S301: The transmitting end sends a D2D communication connection request to the base station.

Specifically, the D2D communication connection request is used to indicate that the transmitting end needs to establish a D2D communication connection with the receiving end. The reason is that when the transmitting end and the receiving end perform D2D communication, the D2D communication connection request needs to be initiated to the base station, and the base station can allocate the communication resources for the transmitting end and the receiving end according to the D2D communication connection request, so that the two terminals can The D2D data information is directly communicated, and the transmitted data no longer needs to be forwarded by the base station, thereby reducing the load of the base station and increasing the capacity of the system.

Step S302: The base station receives the D2D communication connection request sent by the transmitting end.

Step S303: The base station sends the first indication information to the transmitting end.

Specifically, after receiving the D2D communication connection request sent by the transmitting end, the base station generates the first indication information according to the request, where the first indication information includes the first time-frequency resource information generated by the base station according to the D2D communication connection request, The first time-frequency resource information is used to indicate the location of the time domain and the frequency domain resource used by the receiving end to feed back the transmission state information and/or the channel state information, and the transmission state information includes ACK or NACK information. Further, since the transmitting end sends the D2D request connection for the purpose of performing D2D communication, the first indication information includes the first time-frequency resource information used by the receiving end for feeding back the transmission status information and/or the channel status information, and It is necessary to include the second time-frequency resource information used when the transmitting end and the receiving end perform D2D communication. It can be understood that the second time-frequency resource information is also generated by the base station according to the D2D communication connection request.

There are various ways for the base station to carry the first indication information, and how to include the first time-frequency resource information in the first indication information. In one possible implementation manner, the base station may use downlink control information or The high-level signaling carries the first indication information and sends the first indication information to the transmitting end, that is, the type of the bearer information does not need to be redefined or added, and the first indication information is directly carried in the existing downlink control information, thereby improving the utilization of the transmission system. rate.

In a possible implementation, the base station sends the first indication information to the transmitting end, where the base station carries the first by adding a predefined information field or multiplexing the existing information field in the downlink control information. The indication information is sent to the transmitting end. For example, according to the definition of the LTE standard, in the downlink control information, the DCT Format 5 is used to perform the related control information or the indication information of the D2D communication, but in the embodiment of the present invention, In this predefined format, the first indication information is carried by newly adding a predefined information field. For example, the base station may define, on the field Feedback Flag, the first time-frequency resource information used by the receiving end to feed back the transmission state information and/or the channel state information in the first indication information, so as to indicate the receiving terminal at the indicated time-frequency. The resource location is fed back with feedback status information. Optionally, the function of carrying the first indication information may be implemented by multiplexing the existing information field in the predefined format, that is, redefining the existing information field. For example, in the DCI Format 5 format, there is a field Time Resource Pattern (7 bits long), and 20 possible cases are reserved in this field, so it can be used to define a new indication function. Further, the first indication information may further include indication information indicating whether the receiving end performs feedback of the transmission status information, for example, by defining {0, 0, 0, 0, 0, 0, 0} as the indication of the receiving end feedback. The indication of the current transmission status. That is, if the information in the Time Resource Pattern field in the downlink control information of the base station is {0, 0, 0, 0, 0, 0, 0}, it indicates the transmission of the D2D, and the receiving end needs to feedback the transmission status information and/or Channel status information.

In a possible implementation, the first time-frequency resource information includes time domain resource location and frequency domain resource location information determined by the base station according to the D2D communication connection request, that is, the time domain resource location and the frequency domain resource are explicitly indicated. Location so that the receiver directly uses this information for feedback.

In a possible implementation manner, the first time-frequency resource information includes a frequency domain resource location and a time domain resource location indication determined by the base station according to the D2D communication connection request, where the time domain resource location indication is used for indication The domain resource location is a pre-agreed time domain resource location. For example, if the time domain resource location of the D2D communication between the transmitting end and the receiving end is the nth subframe; the pre-agreed time domain resource location is the n+k subframe in the uplink transmission link of the receiving end, where n and k Both are positive integers. That is, the first time-frequency resource information clearly defines the location of the time domain resource, but does not explicitly indicate the location of the frequency domain resource, but when the terminal (including the transmitting end and the receiving end) accesses the base station, the feedback transmission status information is pre-agreed and And the location of the time domain resource used by the channel state information. Therefore, in the embodiment of the present invention, the first time-frequency resource information only needs to include the frequency domain resource location and the time domain resource location indication (which may be an indication of a preset format) Information can also be an indication that does not contain any information). Similarly, the first time-frequency resource information may not include specific frequency domain resource information, that is, only the indication of the start location of the feedback frequency domain resource, and the starting position of the specific frequency domain resource is the base station high-level signaling advance indication. Can be understood as the default frequency domain resource starting position. For example, the feedback position of the time domain can be predefined according to the LTE standard. You can then use the field Time Resource Pattern as {0,0,0,0,0,0,1} as feedback at the beginning of the first subband; define {0,0,0,0, 0, 1, 0}, as feedback at the beginning of the second subband. The frequency domain resource position occupied by the subband here is predefined, and the transmitting end is notified by the base station high layer signaling.

Step S304: The transmitting end receives the first indication information sent by the base station.

Step S305: The transmitting end sends the D2D control information to the receiving end.

Specifically, the transmitting end generates the D2D control information after receiving the first indication information sent by the base station, where the D2D control information includes the first time-frequency resource information, that is, the D2D control information generated by the transmitting end, and may be the first indication information. The first time-frequency resource information is simply copied, and the related processing is performed based on the first time-frequency resource information, and finally the D2D control information including the first time-frequency resource information is generated, and the present invention No specific limitation. In the specific implementation process, the D2D control information sent by the transmitting end to the receiving end may be carried by the downlink control information of the base station, for example, by multiplexing the existing field to carry the D2D control information, and more specifically, the transmitting end will be D2D. The control information is forwarded to the receiving end through the field Time Resource Pattern and the field Frequency Hopping Flag in SCI Format 0. It can be understood that the object sent by the transmitting end can be a specific receiving end or a plurality of specific receiving ends.

In a possible implementation manner, the first indication information further includes second time-frequency resource information that is performed by the base station according to the D2D communication connection request for D2D communication between the transmitting end and the receiving end, and the D2D control information further includes The second time-frequency resource information is described. Therefore, the transmitting end may perform D2D data information transmission with the transmitting end on the specified time-frequency resource according to the second time-frequency resource information.

Step S306: The receiving end receives the D2D control information sent by the transmitting end.

Specifically, the D2D control information includes first time-frequency resource information used when the receiving end feeds back the transmission status information and/or the channel status information. More specifically, the first time-frequency resource information includes a time domain resource location and frequency domain resource location information determined by the base station according to the D2D communication connection request. Optionally, the first time-frequency resource information includes a frequency domain resource location and a time domain resource location indication determined by the base station according to the D2D communication connection request, where the time domain resource location is used to indicate that the time-frequency resource location is Pre-agreed time-frequency resource location.

In a possible implementation manner, the transmitting end sends the D2D control information to the receiving end, where the transmitting end sends the D2D control information to the receiving end at the preset time-frequency resource location, and the preset time-frequency resource location is the base station passing the upper layer. Signaling is configured.

Step S307: The receiving end sends the transmission state information to the base station on the specified time-frequency resource according to the first time-frequency resource information.

Specifically, the transmission status information is used by the base station to indicate, according to the transmission status information, whether the transmitting end performs retransmission of a current data packet, where the transmission status information includes ACK or NACK information. That is, the receiving end successfully receives the D2D data packet sent by the transmitting end according to whether it is successfully received by the receiving end (the receiving end will perform verification every time the receiving end receives the data packet, the verification succeeds that the receiving is successful, and the verification fails, the receiving fails), to the base station The feedback includes ACK or transmission status information of the NACK information, so that the base station gives an indication to the transmitting end according to the feedback transmission status information and/or channel status information. Further, when the ACK is included in the transmission status information fed back by the receiving end to the base station, it indicates that the receiving end has successfully received the D2D data. Therefore, the base station can indicate to the transmitting end that data retransmission is not required at present (because In the prior art, it is blindly transmitted four times, that is, four times whether it is successfully sent or not. Assume that the transmitting end transmits the second time, and the receiving end receives the success, the base station can send an indication to the transmitting end, stop the data packet currently being retransmitted, and perform the transmission of the next new data packet, so as to avoid the receiving end being When the reception is successful, the transmitting end continues to waste resources caused by blind transmission, saves communication resources, and improves transmission efficiency.

In a possible implementation manner, the time domain resource position of the D2D communication between the transmitting end and the receiving end is the nth subframe; the receiving end uses the orthogonal frequency division multiplexing used in the nth subframe different from the D2D communication. The OFDM symbols of the OFDM symbols are transmitted in the uplink and downlink, where n is a positive integer. In general, D2D transmitter/receiver The uplink control information (non-D2D feedback information) fed back by the station and the transmission and reception of the D2D data can be transmitted in the same subframe, that is, the D2D communication and the normal cellular communication can be simultaneously performed, thereby improving communication efficiency. As shown in FIG. 4, FIG. 4 is a schematic diagram of resource time division multiplexing according to an embodiment of the present invention, where D2D data information and LTE uplink control information are time division multiplexed by resources.

In a possible implementation manner, the time domain resource position of the D2D communication between the transmitting end and the receiving end is located in the n0th subframe and the n2th subframe; and the receiving end sends the transmission status information to the base station at the n1th subframe position. And/or channel state information, wherein the n1th subframe is located between the n0th subframe and the n2th subframe in the time domain, and the d0D data communication is not included between the n0th subframe and the n2th subframe. Resources, the n0, n1, and n2 are positive integers. That is, by setting the resources used by the feedback information of the receiving end between the resources of the D2D communication, the transmission efficiency can be accelerated. For example, when the location of the first time-frequency resource is in the subframe n1, the second time-frequency resource location is n0 or the subframe position of the updated time-frequency resource is n2, and n0, n1, n2 are positive integers; there is n0<n1 <n2; A resource for transmitting D2D data is not included between the n0 and n2. In the subframe structure of the embodiment of the present invention, there is no D2D transmission opportunity between n0 and n2, that is, there is no uplink transmission subframe or type 2 subframe, so the D2D response can be performed faster, and the D2D transmission is ensured. The data has a smaller delay and improves spectrum utilization.

In a possible implementation, when the time domain resource location in the first time-frequency resource information is the m-th subframe; the receiving end passes the time domain in the m-th subframe different from the first time-frequency resource information. The OFDM symbols of the orthogonal frequency division multiplexed OFDM symbols corresponding to the resource locations are subjected to uplink and downlink transmission, where m is a positive integer. In general, the uplink data information of the D2D receiving end may be transmitted in the same subframe as the D2D feedback transmission state information and/or channel state information. For the receiving end, D2D feedback can be performed, and the uplink and/or downlink transmission can also be performed. Optionally, as shown in FIG. 5, FIG. 5 is a schematic diagram of resource time division multiplexing according to an embodiment of the present invention, and FIG. 5 is a specific subframe type and format used by the receiving end to perform time division multiplexing.

In a possible implementation, the receiving end specifies a time-frequency in the uplink control information according to the first time-frequency resource information and the acquired preset system frame structure (obtained when accessing the base station) The transmission status information and/or channel status information is fed back to the base station at the resource location. The frame structure of the LTE system is as shown in FIG. 6. FIG. 6 is a schematic structural diagram of a D2D data transmission frame according to an embodiment of the present invention. In a radio frame, 10 subframes are included. For a TDD system, different subframe types exist, and uplink transmission is performed. Subframes also have downlink transmission subframes, which are referred to herein as uplink and downlink ratios. The transmission of feedback information can only be performed in the uplink subframe; for the FDD system, there is an opportunity for uplink transmission in each subframe. If the receiving end receives the D2D data information in the subframe n, the receiving end feeds back the transmission status information or the channel status information on the uplink transmission opportunity of the n+k subframe, where k=4 can be implemented for FDD in LTE. For TDD, the size of k is related to the subframe n and the uplink-down ratio of the system. For example, when the ratio is 2, and n=2, then k=5. It is to be understood that, the base station can perform the indication of the time-frequency resource, and the embodiment of the present invention only provides an example of the indirect indication of the time domain resource, and the specific embodiment of the indirect indication of the time-frequency resource by the base station and the principle of the embodiment. The same, no longer repeat them. In the embodiment of the present invention, the overhead of the control signaling can be saved by indirectly indicating the time domain resource.

In the embodiment of the present invention, the D2D communication connection request sent by the transmitting end is received by the base station, where the D2D communication connection request is used to indicate that the transmitting end needs to establish a D2D communication connection with the receiving end; and the base station sends the first to the transmitting end. Instructing information, the first indication information includes first time-frequency resource information used by the base station according to the D2D communication connection request to indicate that the receiving end feeds back transmission state information and/or channel state information. That is, in the communication mode of the D2D, the transmission state information feedback backhaul mechanism of the receiving end is introduced, so that the base station can according to the transmission status letter. The information and/or channel status information indicates that the transmitting end stops redundant transmission, improves resource utilization, and improves D2D communication efficiency.

Referring to FIG. 7, FIG. 7 is a schematic flowchart of a terminal-to-terminal D2D communication method according to an embodiment of the present invention. The terminal control method in the embodiment of the present invention will be described in detail below with reference to FIG. 7 from the interaction side of the transmitting end, the base station, and the receiving end. The method may include the following steps S701 to S711.

Step S701: The transmitting end sends a D2D communication connection request to the base station.

Step S702: The base station receives the D2D communication connection request sent by the transmitting end.

Step S703: The base station sends first indication information to the transmitting end.

Step S704: The transmitting end receives the first indication information sent by the base station.

Step S705: The transmitting end sends D2D control information to the receiving end.

Step S706: The receiving end receives the D2D control information sent by the transmitting end.

Step S707: The receiving end sends the transmission state information to the base station on the indicated time-frequency resource according to the first time-frequency resource information.

Specifically, step S701 to step S707 may be correspondingly referred to step S301 to step S307 in the embodiment provided in FIG. 3, and specific implementation manners are not described herein again.

Step S708: The base station receives the transmission state information fed back by the receiving end at the indicated time-frequency resource location according to the first time-frequency resource information.

Specifically, after transmitting the first indication information, the base station receives the transmission status information fed back by the receiving end according to the time domain resource location (feedback timing) and the frequency domain resource location in the first time-frequency resource information.

Step S709: The base station sends second indication information to the transmitting end.

Specifically, after receiving the transmission state information and/or the channel state information fed back by the receiving end, the base station generates second indication information according to the transmission state information, where the second indication information includes the base station generating, according to the ACK or NACK information. The new data indicator (NDI) is used to indicate that the transmitting end determines whether to perform retransmission of the current data packet according to the value of the NDI. For example, the base station sets a 1-bit new data indication signaling NDI while instructing the transmitting end to send a data packet. When the base station receives the ACK information in the transmission status information fed back by the receiving end, the base station flips the NDI once (for example, flipping from 0) To 1), when the base station receives the NACK information in the transmission status information fed back by the receiving end, the value of the NDI is kept unchanged, that is, it is not inverted (0 continues to be 0), so that the transmitting end is flipped according to the value of the NDI. To determine whether to continue the retransmission of the current packet. In the specific implementation process, the information of the field Frequency Hopping Flag (1 bit length) may be selected in the DCI Format 5 format as the new data indication signaling NDI (the information of the field is originally used to indicate whether the D2D transmitting end needs to adopt the frequency hopping method. Transmission) If the indication information in the field Time Resource Pattern is indication information indicating whether the receiving end performs feedback of the transmission information, the information of the field Frequency Hopping Flag automatically changes to the data indicating whether the current transmission is retransmitted. For example, according to the above definition, when the information transmitted by the field Time Resource Pattern is {0, 0, 0, 0, 0, 0, 0}, if the information in the field Frequency Hopping Flag is {0}, the current transmission is Retransmit data; if the information in the field Frequency Hopping Flag is {1}, it indicates that the current transmission is non-retransmitted data. It should be noted that the first indication information and the second indication information use the same information format, that is, the attributes, types, sequences, and the like of the multiple fields in the first indication information and the second indication information are all configured to be the same, and the first The indication information differs from the second indication information only in that different values are filled in the same field (the same type information).

In a possible implementation manner, the second indication information includes, in addition to the NDI, updated time-frequency resource information that is performed by the base station according to the ACK or NACK information in the transmission status information for D2D communication between the transmitting end and the receiving end. The meaning of the updated time-frequency resource information is that the base station can dynamically adjust the time-frequency resource information used for D2D communication between the transmitting end and the receiving end according to the transmission state information and/or channel state information fed back by the receiving end, so as to facilitate transmission according to the transmission. Even if the effect is adjusted. For example, when more transmission status information including ACK is received, it can be considered that the current time-frequency resource is ideal, and the resource is of high quality, so that it can be maintained without adjustment, but if the transmission status information including the NACK is received, For a long time, it can be considered that the current time-frequency resources are poor, and may be crowded or interfered with, resulting in more data transmission failures. Therefore, it is necessary to update the allocated time-frequency resources in an instant, which is beneficial to improve D2D transmission quality and transmission efficiency. .

Step S710: The transmitting end receives the second indication information sent by the base station.

Specifically, the second indication information is generated by the base station according to the received transmission state information and/or channel state information fed back by the receiving end, where the transmission state information includes ACK or NACK information, and the second indication The information includes a new data indication signaling NDI generated by the base station according to the ACK or NACK information; after the transmitting end sends the D2D control information to the receiving end (after the D2D data transmission is performed on the transmitting end and the receiving end), Receiving the second indication information sent by the base station in step S509.

Step S711: The transmitting end determines whether to perform retransmission of the current data packet according to the value of the NDI.

Specifically, the transmitting end determines whether to perform according to the value of the NDI in the received second indication information.

Retransmission of the current data packet. Further, the transmitting end determines whether to perform data retransmission according to the value of the NDI. The specific process is: the transmitting end determines whether the value of the NDI is reversed; if the inversion, the transmitting end stops sending the currently sent data packet, and clears The current transmission buffer, for the transmission of new data packets, and when the value of the NDI remains unchanged (ie, not flipped), the transmitting end continues to retransmit the current data packet (until the indicated number of times), and the receiving end also It will continue to receive the retransmitted data packet, store it in the receive data buffer, and merge and decode it with the previous version. Further, in the process of transmitting D2D data information to the receiving end at the transmitting end (the information includes the value of the NDI), the receiving end may also determine whether to clear the buffer of the received data packet according to the value of the NDI, although In the prior art, the buffer is uniformly cleared after receiving four times, but after adopting the technical solution of the present invention, after the data packet receives, for example, one or two successes, the cache is cleared in advance and new data is started to be received, which is beneficial to improvement. Receive the capacity of the data, freeing up more space for new packet storage.

In a possible implementation manner, a time domain resource position of the transmitting end performing D2D communication with the receiving end is an nth subframe; and the transmitting end is different from the D2D by using the nth subframe. The OFDM symbols of the Orthogonal Frequency Division Multiplexing OFDM symbols used for communication are transmitted in the uplink and downlink, where n is a positive integer.

In the embodiment of the present invention, in a specific implementation process, for example, in an LTE evolving system, a new subframe structure may be used for transmission. In this case, the domain resource length may be less than 1 ms subframe length, so that the transmitting end sends D2D data information and The LTE uplink control information is multiplexed in time, and the transmitting end receives the downlink data information in the third subframe. According to the predefined feedback timing, the terminal needs to send the uplink control information to the base station in the seventh subframe, to notify the Whether the data received in the 3 subframes is successful. If the terminal acts as the transmitting end at the same time, the D2D data information is to be transmitted in the 7th subframe. Therefore, as shown in FIG. 8, FIG. 8 is a schematic diagram of time division multiplexing of an uplink control information resource according to an embodiment of the present invention. The transmitting end may send both D2D data information and LTE uplink control information, where the D2D data information includes but is not limited to : D2D control information and D2D data information. In addition, when the transmitting end sends D2D data information, it will receive according to The downlink control information that arrives determines whether to retransmit the new data information. If the retransmission data information is instructed to be transmitted, retransmission is performed, otherwise the new data information is transmitted. The timing relationship of the feedback is as shown in FIG. 9 when the receiving end feeds back the transmission state information and/or the channel state information. FIG. 9 is a timing diagram of the feedback of the D2D receiving end according to the embodiment of the present invention. The first indication information is related. If the first indication information does not include the starting position of the frequency domain, the feedback frequency domain resource location is a default frequency domain starting position configured by the high layer signaling. If the first indication information includes the indication information of the start position of the frequency domain, the receiving end performs feedback according to the indication information. It should be noted that the feedback information of the receiving end is carried by the LTE uplink control information.

Referring to FIG. 10, FIG. 10 is a base station 10 according to an embodiment of the present invention. The base station 10 includes an input unit 101, an output unit 102, a storage unit 103, and a processing unit 104. In some embodiments of the present invention, the input is performed. The unit 101, the storage unit 103, and the processing unit 104 may be connected by a bus or other means, wherein the connection by a bus is taken as an example in FIG. The processing unit 104 calls the program code in the storage unit 103 to perform the following operations:

Receiving, by the input unit 101, a D2D communication connection request sent by the transmitting end, where the D2D communication connection request is used to indicate that the transmitting end needs to establish a D2D communication connection with the receiving end;

Transmitting, by the output unit 102, the first indication information to the transmitting end, where the first indication information includes, when the base station generates, according to the D2D communication connection request, the receiving end feedbacks the transmission status information and/or the channel status information. The first time-frequency resource information used.

In an optional solution, the processing unit 104 is further configured to:

After the first indication information is sent to the transmitting end by the output unit 102, the transmission state information and/or channel state information fed back by the receiving end is received at the specified time-frequency resource location according to the first time-frequency resource information, The transmission status information includes ACK or NACK information.

In another alternative, the processing unit 104 is further configured to:

After receiving the transmission state information and/or channel state information fed back by the receiving end by the input unit 101 according to the first time-frequency resource information, sending, by the output unit 102, the second indication to the transmitting end. Information, the second indication information includes a new data indication signaling NDI generated by the base station according to the transmission status information or the channel state information, where the NDI is used to indicate that the transmitting end determines according to the value of the NDI Whether to retransmit the current packet.

In still another optional solution, the second indication information further includes: when the base station generates the update of the D2D communication with the receiving end according to the transmission state information and/or the channel state information, Frequency resource information.

In another optional solution, the processing unit 104 is configured to send the first indication information to the transmitting end by using the output unit 102, specifically:

The first indication information is carried by the output unit 102 through downlink control information or high layer signaling and sent to the transmitting end.

In another optional solution, the processing unit 104 is configured to send the first indication information to the transmitting end by using the output unit 102, including:

The first indication information is carried by the output unit 102 through the information field in the downlink control information and sent to the transmitting end.

In still another optional solution, the first indication information further includes second time-frequency resource information that is sent by the base station to perform D2D communication with the receiving end by the transmitting end according to the D2D communication connection request.

In still another optional solution, the first time-frequency resource information includes a time domain resource location and frequency domain resource location information determined by the base station according to the D2D communication connection request.

In still another optional solution, the first time-frequency resource information includes a frequency domain resource location and a time domain resource location indication determined by the base station according to the D2D communication connection request, where the time domain resource location indication is used. Indicates that the time domain resource location is a pre-agreed time domain resource location.

In still another optional solution, the time domain resource location where the transmitting end performs D2D communication with the receiving end is an nth subframe; and the pre-agreed time domain resource location is uplink transmission of the receiving end. The n+kth subframe in the link, where n and k are both positive integers.

In still another optional solution, the first indication information further includes information indicating whether the receiving end needs to perform transmission state information and/or channel state information feedback.

It can be understood that the functions of the units in the base station 10 can be referred to the specific implementation manners in the foregoing method embodiments in FIG. 1-8, and details are not described herein again.

Referring to FIG. 11, FIG. 11 is a terminal device 20 according to an embodiment of the present invention. The terminal device 20 may include: an input unit 201, an output unit 202, a storage unit 203, and a processing unit 204, in some aspects of the present invention. In the examples. The bus is used to implement the communication connection between the components. The input unit 201 is specifically a touch panel of the terminal, and includes a touch screen and a touch screen for detecting an operation instruction on the touch panel of the terminal. The output unit 202 may include a display of the terminal for outputting, displaying images or data; the memory 203 may be a high-speed RAM display or a non-volatile memory, such as at least one disk display, and the memory 203 is optional. It may also be at least one display device located remotely from the aforementioned processor 201. As shown in FIG. 11, an operating system, a network communication module, a user interface module, and a data processing program may be included in the memory 203 as a computer display medium.

The storage unit 203 is configured to store program code, and the processing unit 204 is configured to invoke the program code stored by the storage unit to perform the following steps:

Sending, by the output unit 202, a D2D communication connection request to the base station, where the D2D communication connection request is used to indicate that the transmitting end needs to establish a D2D communication connection with the receiving end;

The first indication information sent by the base station is received by the input unit 201, where the first indication information includes first time-frequency resource information used when the receiving end feeds back the transmission status information and/or the channel status information, where the transmission status is The information includes ACK or NACK information;

Transmitting, by the output unit 202, D2D control information to the receiving end, where the D2D control information includes the One-time frequency resource information.

In an optional solution, the first indication information further includes second time-frequency resource information that is sent by the base station to perform D2D communication with the receiving end by the transmitting end according to the D2D communication connection request; The D2D control information further includes the second time-frequency resource information.

In another optional solution, the processing unit 204 is further configured to:

After the D2D control information is sent to the receiving end by the output unit 202, the D2D data transmission is performed with the transmitting end on the specified time-frequency resource according to the second time-frequency resource information.

In yet another alternative, the processing unit 204 is further configured to:

After the D2D control information is sent to the receiving end by the output unit 202, the second indication information sent by the base station is received by the input unit 201, where the second indication information is transmitted by the base station according to the received feedback from the receiving end. The status information and/or the channel status information is generated, the transmission status information includes ACK or NACK information, and the second indication information includes a new data indication signaling NDI generated by the base station according to the ACK or NACK information; The value of the NDI determines whether to retransmit the current packet.

In another optional solution, the processing unit 204 is configured to determine, according to the value of the NDI, whether to perform data retransmission, specifically:

Determining whether the value of the NDI is inverted;

If not flipped, the current packet is retransmitted.

In still another optional solution, the time domain resource position of the transmitting end performing D2D communication with the receiving end is an nth subframe; the transmitting end is different from the said nth subframe by the The OFDM symbols of the Orthogonal Frequency Division Multiplexing OFDM symbols used for D2D communication are transmitted in the uplink and downlink, where n is a positive integer.

In still another optional solution, the first time-frequency resource information includes a frequency domain resource location and a time domain resource location indication determined by the base station according to the D2D communication connection request, where the time domain resource location indication is used. The location of the time-frequency resource is indicated as a pre-agreed time-frequency resource location.

In another optional solution, the processing unit 204 is configured to send, by using the output unit 202, D2D control information to the receiving end, specifically:

The D2D control information is sent to the receiving end by the output unit 202 at the preset time-frequency resource location, where the preset time-frequency resource location is configured by the base station by using high-layer signaling.

It can be understood that the functions of the units in the transmitting end 20 can be referred to the specific implementation manners in the foregoing method embodiments in FIG. 1-8, and details are not described herein again.

Referring to FIG. 12, FIG. 12 is a terminal device 30 according to an embodiment of the present invention. The terminal device 30 may include an input unit 301, an output unit 302, a storage unit 303, and a processing unit 304. Some of the present invention. In the examples. The bus is used to implement the communication connection between the components. The input unit 301 is specifically a touch panel of the terminal, and includes a touch screen and a touch screen for detecting an operation instruction on the touch panel of the terminal. The output unit 302 may include A display of the terminal for outputting, displaying an image or data; the memory 303 may be a high-speed RAM display or a non-volatile memory, such as at least one disk display, and the memory 303 is optional. It may also be at least one display device located remotely from the aforementioned processor 301. As shown in FIG. 12, an operating system, a network communication module, a user interface module, and a data processing program may be included in the storage unit 303 as a computer display medium.

The storage unit 303 is configured to store the program code, and the processing unit 304 is configured to invoke the program code stored by the storage unit 303 to perform the following steps:

The D2D control information sent by the transmitting end is received by the input unit 301, where the D2D control information includes first time-frequency resource information used when the receiving end feeds back the transmission status information and/or the channel status information;

Transmitting transmission state information and/or channel state information to the base station on the specified time-frequency resource by the output unit 302 according to the first time-frequency resource information, where the transmission state information and/or channel state information is used by the base station according to the base station The transmission status information or channel status information indicates that the transmitting end performs retransmission of the current data packet, or clears the current transmission buffer and performs transmission of a new data packet, where the transmission status information includes ACK or NACK information.

In an optional solution, the processing unit 304 is configured to send the transmission state information and/or the channel state information to the base station by using the output unit 302 on the specified time-frequency resource according to the first time-frequency resource information, specifically :

And transmitting, by the output unit 302, the transmission status information and/or the channel status information to the base station at the specified time-frequency resource position in the uplink control information according to the first time-frequency resource information and the acquired preset system frame structure.

In another optional solution, the D2D control information further includes second time-frequency resource information that is performed by the transmitting end to perform D2D communication with the receiving end.

In still another optional solution, the D2D control information further includes an updated time-frequency of the D2D communication between the transmitting end and the receiving end generated by the base station according to the transmission state information and/or channel state information. Resource information.

In still another optional solution, the time domain resource position of the transmitting end performing D2D communication with the receiving end is an nth subframe; the receiving end is different from the nth subframe by the The OFDM symbols of the Orthogonal Frequency Division Multiplexing OFDM symbols used for D2D communication are transmitted in the uplink and downlink, where n is a positive integer.

In still another optional solution, the time domain resource location in which the transmitting end performs D2D communication with the receiving end is located in the n0th subframe and the n2th subframe; and the receiving end is in the nth subframe position. Transmitting, by the base station, the transmission state information and/or the channel state information, where the nth subframe is located between the n0th subframe and the n2th subframe in a time domain, Resources for performing D2D data communication are not included between the n0th subframe and the n2th subframe, and the n0, n1, and n2 are positive integers.

In still another optional solution, the time domain resource location in the first time-frequency resource information is the m-th subframe; and the receiving end is different from the first time in the m-th subframe. The OFDM symbols of the orthogonal frequency division multiplexing OFDM symbols corresponding to the time domain resource locations in the frequency resource information are transmitted in the uplink and the downlink, where m is a positive integer.

In still another optional solution, the first time-frequency resource information includes a frequency domain resource location and a time domain resource location indication determined by the base station according to the D2D communication connection request, where the time domain resource location is used. Indicates that the time-frequency resource location is a pre-agreed time-frequency resource location.

In still another optional solution, the time domain resource location of the D2D communication between the transmitting end and the receiving end is an nth subframe; and the pre-agreed time domain resource location is an uplink transmission link of the receiving end. The n+kth subframe in which n and k are both positive integers.

It can be understood that the functions of the units in the receiving end 30 can be referred to the specific implementation manners in the foregoing method embodiments in FIG. 1-8, and details are not described herein again.

A terminal-to-terminal D2D communication system provided by the present invention, as shown in FIG. 13, the system 40 includes a base station, a transmitting end, and a receiving end, wherein

The base station 401 may be the base station 10 in the above-mentioned embodiment of FIG. 10; the transmitting end 402 may be the transmitting end 20 in the above-mentioned embodiment of FIG. 11; the receiving end 403 may be the receiving end 30 in the above-described embodiment of FIG. It can be understood that the system 40 in the embodiment of the present invention may further include a server, a small base station, an enterprise network device, a routing device, a switching device, and a service center.

It is to be understood that the functions of the base station 401, the transmitting end 402, and the receiving end 403 in the system 40 may be referred to the specific implementation manners in the foregoing method embodiments in FIG.

The embodiment of the present invention further provides a computer storage medium, wherein the computer storage medium can store a program, and the program includes some or all of the steps of the terminal-to-terminal D2D communication method described in the foregoing method embodiments.

In the above embodiments, the descriptions of the various embodiments are different, and the details that are not detailed in a certain embodiment can be referred to the related descriptions of other embodiments.

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. Because certain steps may be performed in other sequences or concurrently in accordance with the present invention. In addition, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

In the several embodiments provided herein, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the above units 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 integrated. Go to 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 electrical or otherwise.

The units described above as separate components may or may not be physically separated. 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 may be each Units exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The above-described integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium. The instructions include a plurality of instructions for causing a computer device (which may be a personal computer, server or network device, etc., and in particular a processor in a computer device) to perform all or part of the steps of the above-described methods of various embodiments of the present invention. The foregoing storage medium may include: a U disk, a mobile hard disk, a magnetic disk, an optical disk, a read only memory (English: Read-Only Memory, abbreviation: ROM) or a random access memory (English: Random Access Memory, abbreviation: RAM) and other media that can store program code.

The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the embodiments are modified, or the equivalents of the technical features are replaced by the equivalents of the technical solutions of the embodiments of the present invention.

Claims

A terminal-to-terminal D2D communication method, characterized in that the method comprises:

Receiving, by the base station, a D2D communication connection request sent by the transmitting end, where the D2D communication connection request is used to indicate that the transmitting end needs to establish a D2D communication connection with the receiving end;

Transmitting, by the base station, first indication information to the transmitting end, where the first indication information includes, when the base station generates, according to the D2D communication connection request, the receiving end feedbacks transmission state information and/or channel state information. The first time-frequency resource information used.
The method according to claim 1, wherein after the base station sends the first indication information to the transmitting end, the method further includes:

The base station receives, according to the first time-frequency resource information, transmission state information and/or channel state information that is fed back by the receiving end at a specified time-frequency resource location, where the transmission state information includes ACK or NACK information.
The method according to claim 2, wherein the base station, after receiving the transmission status information fed back by the receiving end, according to the first time-frequency resource information, is further included:

The base station sends the second indication information to the transmitting end, where the second indication information includes a new data indication signaling NDI generated by the base station according to the transmission status information or the channel state information, where the NDI is used. Instructing the transmitting end to determine whether to perform retransmission of the current data packet according to the value of the NDI.
The method according to claim 3, wherein the second indication information further comprises that the transmitting end generated by the base station according to the transmission state information and/or channel state information performs D2D communication with the receiving end. Update time-frequency resource information.
The method according to any one of claims 1-4, wherein the sending, by the base station, the first indication information to the transmitting end comprises:

The base station carries the first indication information by using downlink control information or high layer signaling, and sends the first indication information to the transmitting end.
The method according to any one of claims 1-4, wherein the sending, by the base station, the first indication information to the transmitting end comprises:

The base station carries the first indication information by using an information field in the downlink control information, and sends the first indication information to the transmitting end.
The method according to any one of claims 1-6, wherein the first indication information further comprises that the transmitting end generated by the base station according to the D2D communication connection request performs D2D communication with the receiving end. Second time-frequency resource information.
The method according to any one of claims 1 to 7, wherein the first time-frequency resource information comprises a time domain resource location and frequency domain resource location information determined by the base station according to the D2D communication connection request.
The method according to any one of claims 1 to 7, wherein the first time-frequency resource information comprises a frequency domain resource location and a time domain resource location indication determined by the base station according to the D2D communication connection request, The time domain resource location indication is used to indicate that the time domain resource location is a pre-agreed time domain resource location.
The method according to claim 9, wherein the time domain resource location at which the transmitting end performs D2D communication with the receiving end is an nth subframe; and the pre-agreed time domain resource location is the receiving end The n+kth subframe in the uplink transmission link is performed, where n and k are both positive integers.
The method according to any one of claims 1 to 10, wherein the first indication information further comprises information indicating whether the receiving end needs to perform transmission state information and/or channel state information feedback.
A terminal-to-terminal D2D communication method, characterized in that the method comprises:

The transmitting end sends a D2D communication connection request to the base station, where the D2D communication connection request is used to indicate that the transmitting end needs to establish a D2D communication connection with the receiving end;

The transmitting end receives the first indication information that is sent by the base station, where the first indication information includes first time-frequency resource information used when the receiving end feeds back the transmission status information and/or the channel status information, where the transmission status is The information includes ACK or NACK information;

The transmitting end sends D2D control information to the receiving end, where the D2D control information includes the first time-frequency resource information.
The method according to claim 12, wherein the first indication information further comprises a second time frequency that the base station performs D2D communication with the receiving end by the transmitting end according to the D2D communication connection request. Resource information; the D2D control information further includes the second time-frequency resource information.
The method according to claim 13, wherein after the transmitting end sends the D2D control information to the receiving end, the method further includes:

The transmitting end performs D2D data transmission with the transmitting end on the specified time-frequency resource according to the second time-frequency resource information.
The method according to any one of claims 12-14, wherein after the transmitting end sends the D2D control information to the receiving end, the method further includes:

The transmitting end receives the second indication information sent by the base station, where the second indication information is generated by the base station according to the received transmission status information or channel state information fed back by the receiving end, where the transmission status information includes ACK or NACK information, the second indication information includes a new data indication signaling NDI generated by the base station according to the ACK or NACK information;

The transmitting end determines whether to perform retransmission of the current data packet according to the value of the NDI.
The method of claim 15 wherein said transmitting end determines based on said value of said NDI Whether to retransmit the data, including:

Determining whether the value of the NDI is inverted;

If it is flipped, the current transmission buffer is cleared, and a new data packet is transmitted;

If not flipped, the current packet is retransmitted.
The method according to claim 15, wherein the second indication information further comprises that the transmitting end generates D2D communication with the receiving end by the base station according to the transmission state information and/or channel state information. Update time-frequency resource information.
The method according to claim 13 or 17, wherein the time domain resource position at which the transmitting end performs D2D communication with the receiving end is an nth subframe; and the transmitting end passes the nth subframe. The OFDM symbols different from the orthogonal frequency division multiplexed OFDM symbols used in the D2D communication are transmitted in the uplink and the downlink, where n is a positive integer.
The method according to any one of claims 12 to 18, wherein the first time-frequency resource information comprises a time domain resource location and frequency domain resource location information determined by the base station according to the D2D communication connection request.
The method according to any one of claims 12 to 18, wherein the first time-frequency resource information comprises a frequency domain resource location and a time domain resource location indication determined by the base station according to the D2D communication connection request, The time domain resource location indication is used to indicate that the time-frequency resource location is a pre-agreed time-frequency resource location.
The method according to claim 20, wherein the time domain resource location at which the transmitting end performs D2D communication with the receiving end is an nth subframe; and the pre-agreed time domain resource location is the receiving end The n+kth subframe in the uplink transmission link is performed, where n and k are both positive integers.
The method according to any one of claims 12 to 21, wherein the transmitting end sends D2D control information to the receiving end, including:

The transmitting end sends D2D control information to the receiving end at a preset time-frequency resource location, where the preset time-frequency resource location is configured by the base station by using high-layer signaling.
A terminal-to-terminal D2D communication method, characterized in that the method comprises:

The receiving end receives the D2D control information sent by the transmitting end, where the D2D control information includes first time-frequency resource information used when the receiving end feeds back the transmission status information and/or the channel status information;

The receiving end sends transmission state information and/or channel state information to the base station on the specified time-frequency resource according to the first time-frequency resource information, where the transmission state information and/or channel state information is used by the base station according to the The transmission status information or channel status information indicates that the transmitting end performs retransmission of the current data packet, or clears the current transmission buffer and performs transmission of a new data packet, where the transmission status information includes ACK or NACK information.
The method according to claim 23, wherein the receiving end transmits the transmission state information and/or the channel state information to the base station on the specified time-frequency resource according to the first time-frequency resource information, including:

The receiving end feeds back the transmission state information and/or the channel state information to the base station at the specified time-frequency resource location in the uplink control information according to the first time-frequency resource information and the acquired preset system frame structure.
The method according to claim 23 or 24, wherein the D2D control information further comprises second time-frequency resource information that the transmitting end performs D2D communication with the receiving end.
The method according to claim 23 or 24, wherein the D2D control information further comprises the transmitting end and the receiving end performing D2D generated by the base station according to the transmission state information and/or channel state information. Update time-frequency resource information for communication.
The method according to claim 25 or 26, wherein the time domain resource position at which the transmitting end performs D2D communication with the receiving end is an nth subframe; and the receiving end passes the nth subframe. The OFDM symbols different from the orthogonal frequency division multiplexed OFDM symbols used in the D2D communication are transmitted in the uplink and the downlink, where n is a positive integer.
The method according to claim 25 or 26, wherein the time domain resource position at which the transmitting end performs D2D communication with the receiving end is located in the n0th subframe and the n2th subframe; the receiving end is in the Transmitting, by the n1 subframe position, the transmission state information and/or the channel state information to the base station, where the nth subframe is located in the nth subframe and the n2 subframe in a time domain. Between the n0th subframe and the n2th subframe, resources for performing D2D data communication are not included, and the n0, n1, and n2 are positive integers.
The method according to claim 23, wherein the time domain resource location in the first time-frequency resource information is an m-th subframe; and the receiving end is different from the The OFDM symbols of the orthogonal frequency division multiplexing OFDM symbols corresponding to the time domain resource locations in the first time-frequency resource information are uplink and downlink, where m is a positive integer.
The method according to any one of claims 23 to 29, wherein the first time-frequency resource information comprises time domain resource location and frequency domain resource location information determined by the base station according to the D2D communication connection request.
The method according to any one of claims 23 to 29, wherein the first time-frequency resource information comprises a frequency domain resource location and a time domain resource location indication determined by the base station according to the D2D communication connection request, The time domain resource location is used to indicate that the time-frequency resource location is a pre-agreed time-frequency resource location.
The method according to claim 31, wherein the time domain resource location at which the transmitting end and the receiving end perform D2D communication is an nth subframe; and the pre-agreed time domain resource location is uplinked by the receiving end The n+kth subframe in the transmission link, where n and k are both positive integers.
A base station, comprising: an input unit, an output unit, a storage unit, and a processing unit;

The storage unit is configured to store program code, and the processing unit is configured to invoke the program code stored by the storage unit to perform the following steps:

Receiving, by the input unit, a D2D communication connection request sent by the transmitting end, where the D2D communication connection request is used to indicate that the transmitting end needs to establish a D2D communication connection with the receiving end;

Sending, by the output unit, the first indication information to the transmitting end, where the first indication information includes the indication, by the base station, that the receiving end sends feedback status information and/or channel status information according to the D2D communication connection request. The first time-frequency resource information used at the time.
The base station according to claim 33, wherein the processing unit is further configured to:

After the first indication information is sent to the transmitting end by the output unit, the transmission state information and/or channel state information fed back by the receiving end is received at the specified time-frequency resource location according to the first time-frequency resource information. The transmission status information includes ACK or NACK information.
The base station according to claim 34, wherein the processing unit is further configured to:

After receiving, by the input unit, the transmission status information fed back by the receiving end by using the first time-frequency resource information, sending, by the output unit, second indication information to the transmitting end, The second indication information includes a new data indication signaling NDI generated by the base station according to the transmission status information or the channel state information, where the NDI is used to indicate that the transmitting end determines whether to perform current data according to the value of the NDI. Retransmission of the package.
The base station according to claim 35, wherein the second indication information further comprises that the transmitting end generates D2D communication with the receiving end according to the transmission state information and/or channel state information. Update time-frequency resource information.
The base station according to any one of claims 33 to 36, wherein the processing unit is configured to send the first indication information to the transmitting end by using the output unit, specifically:

And transmitting, by the output unit, the first indication information by using downlink control information or high layer signaling, and sending the first indication information to the transmitting end.
The base station according to any one of claims 33 to 36, wherein the processing unit is configured to send the first indication information to the transmitting end by using the output unit, including:

And transmitting, by the output unit, the first indication information by using an information field in the downlink control information, and sending the first indication information to the transmitting end.
The base station according to any one of claims 33 to 38, wherein the first indication information further comprises that the transmitting end generated by the base station according to the D2D communication connection request performs D2D communication with the receiving end. First Two time-frequency resource information.
The base station according to any one of claims 33 to 39, wherein the first time-frequency resource information comprises time domain resource location and frequency domain resource location information determined by the base station according to the D2D communication connection request.
The base station according to any one of claims 33 to 39, wherein the first time-frequency resource information comprises a frequency domain resource location and a time domain resource location indication determined by the base station according to the D2D communication connection request, The time domain resource location indication is used to indicate that the time domain resource location is a pre-agreed time domain resource location.
The base station according to claim 41, wherein the time domain resource location in which the transmitting end performs D2D communication with the receiving end is an nth subframe; and the pre-agreed time domain resource location is the receiving end The n+kth subframe in the uplink transmission link is performed, where n and k are both positive integers.
The base station according to any one of claims 33 to 42, wherein the first indication information further includes information indicating whether the receiving end needs to perform transmission state information and/or channel state information feedback.
A terminal device, wherein the terminal device is a transmitting end, and the transmitting end comprises: an input unit, an output unit, a storage unit, and a processing unit;

The storage unit is configured to store program code, and the processing unit is configured to invoke the program code stored by the storage unit to perform the following steps:

Sending, by the output unit, a D2D communication connection request to the base station, where the D2D communication connection request is used to indicate that the transmitting end needs to establish a D2D communication connection with the receiving end;

And receiving, by the input unit, first indication information that is sent by the base station, where the first indication information includes first time-frequency resource information used when the receiving end feeds back the transmission status information and/or the channel status information, where the transmission Status information includes ACK or NACK information;

And transmitting, by the output unit, D2D control information to the receiving end, where the D2D control information includes the first time-frequency resource information.
The transmitting end according to claim 44, wherein the first indication information further comprises a second time that the base station performs D2D communication with the receiving end by the transmitting end according to the D2D communication connection request. Frequency resource information; the D2D control information further includes the second time-frequency resource information.
The transmitting end according to claim 45, wherein the processing unit is further configured to:

After the D2D control information is sent to the receiving end by the output unit, D2D data transmission is performed with the transmitting end on the specified time-frequency resource according to the second time-frequency resource information.
The transmitting end according to any one of claims 44 to 46, wherein the processing unit is further configured to:

After the D2D control information is sent to the receiving end by the output unit, the second indication information sent by the base station is received by the input unit, where the second indication information is sent by the base station according to the receiving end. Pass The transmission status information or the channel status information is generated, the transmission status information includes ACK or NACK information, and the second indication information includes a new data indication signaling NDI generated by the base station according to the ACK or NACK information; The value of NDI determines whether or not to retransmit the current packet.
The transmitting end according to claim 47, wherein the processing unit is configured to determine whether to perform data retransmission according to the value of the NDI, specifically:

Determining whether the value of the NDI is inverted;

If it is flipped, the current transmission buffer is cleared, and a new data packet is transmitted;

If not flipped, the current packet is retransmitted.
The transmitting end according to claim 47, wherein the second indication information further comprises that the transmitting end and the receiving end generate D2D by the base station according to the transmission state information and/or channel state information. Update time-frequency resource information for communication.
The transmitting end according to claim 45 or 49, wherein the time domain resource position at which the transmitting end performs D2D communication with the receiving end is an nth subframe; and the transmitting end passes the nth subframe The OFDM symbols on the OFDM symbol different from the OFDM symbols used in the D2D communication are uplink and downlink, where n is a positive integer.
The transmitting end according to any one of claims 44-50, wherein the first time-frequency resource information comprises a time domain resource location and a frequency domain resource location information determined by the base station according to the D2D communication connection request. .
The transmitting end according to any one of claims 44-50, wherein the first time-frequency resource information comprises a frequency domain resource location and a time domain resource location indication determined by the base station according to the D2D communication connection request. The time domain resource location indication is used to indicate that the time-frequency resource location is a pre-agreed time-frequency resource location.
The transmitting end according to claim 52, wherein the time domain resource location in which the transmitting end performs D2D communication with the receiving end is an nth subframe; and the pre-agreed time domain resource location is the receiving The terminal performs an n+kth subframe in the uplink transmission link, where n and k are both positive integers.
The transmitting end according to any one of claims 44-53, wherein the processing unit is configured to send D2D control information to the receiving end by using the output unit, specifically:

The D2D control information is sent to the receiving end by using the output unit at a preset time-frequency resource location, where the preset time-frequency resource location is configured by the base station by using high-layer signaling.
A terminal device, wherein the terminal device is a receiving end, and the receiving end comprises: an input unit, an output unit, a storage unit, and a processing unit;

The storage unit is configured to store program code, and the processing unit is configured to invoke the storage unit to store The program code performs the following steps:

Receiving D2D control information sent by the transmitting end by using the input unit, where the D2D control information includes first time-frequency resource information used when the receiving end feeds back the transmission state information and/or the channel state information;

Transmitting transmission state information and/or channel state information to the base station by using the output unit on the specified time-frequency resource according to the first time-frequency resource information, where the transmission state information and/or channel state information is used by the base station And transmitting, according to the transmission state information or the channel state information, the transmitting end to retransmit the current data packet, or clearing the current transmission buffer and performing transmission of a new data packet, where the transmission state information includes ACK or NACK information.
The receiving end according to claim 55, wherein the processing unit is configured to send, by using the output unit, transmission state information to the base station on the specified time-frequency resource according to the first time-frequency resource information and/or Or channel status information, specifically:

And transmitting, by the output unit, the transmission status information and/or the channel status information to the base station at the specified time-frequency resource position in the uplink control information according to the first time-frequency resource information and the acquired preset system frame structure. .
The receiving end according to claim 55 or 56, wherein the D2D control information further comprises second time-frequency resource information that the transmitting end performs D2D communication with the receiving end.
The receiving end according to claim 55 or 56, wherein the D2D control information further includes the transmitting end and the receiving end generated by the base station according to the transmission state information and/or channel state information. Updated time-frequency resource information for D2D communication.
The receiving end according to claim 57 or 58, wherein the time domain resource position at which the transmitting end performs D2D communication with the receiving end is an nth subframe; and the receiving end passes the nth subframe The OFDM symbols on the OFDM symbol different from the OFDM symbols used in the D2D communication are uplink and downlink, where n is a positive integer.
The receiving end according to claim 57 or 58, wherein the time domain resource position at which the transmitting end performs D2D communication with the receiving end is located in the n0th subframe and the n2th subframe; Transmitting the transmission state information and/or the channel state information to the base station at the n1th subframe position, where the nth subframe is located in the nth subframe and the nth subframe in the time domain Between frames, resources for performing D2D data communication are not included between the n0th subframe and the n2th subframe, and n0, n1, and n2 are positive integers.
The receiving end according to claim 55, wherein the time domain resource position in the first time-frequency resource information is an m-th subframe; and the receiving end is different from the An OFDM symbol of an Orthogonal Frequency Division Multiplexing OFDM symbol corresponding to a time domain resource location in the first time-frequency resource information is used for uplink and downlink transmission, where m is a positive integer.
The receiving end according to any one of claims 55-61, wherein said first time-frequency resource information And including time domain resource location and frequency domain resource location information determined by the base station according to the D2D communication connection request.
The receiving end according to any one of claims 55 to 61, wherein the first time-frequency resource information comprises a frequency domain resource location and a time domain resource location indication determined by the base station according to the D2D communication connection request. The time domain resource location is used to indicate that the time-frequency resource location is a pre-agreed time-frequency resource location.
The receiving end according to claim 63, wherein the time domain resource location in which the transmitting end and the receiving end perform D2D communication is an nth subframe; and the pre-agreed time domain resource location is performed by the receiving end The n+kth subframe in the uplink transmission link, where n and k are both positive integers.
A terminal-to-terminal D2D communication system, comprising: a base station, a transmitting end, and a receiving end, wherein

The base station is the base station according to any one of claims 33-43;

The transmitting end is the transmitting end according to any one of claims 44-54;

The receiving end is the receiving end according to any one of claims 55-64.