CN107566096A - A kind of terminal-to-terminal service D2D communication means, relevant device and system - Google Patents

Abstract

The embodiment of the present invention discloses a device-to-device D2D communication method, related equipment and system, wherein the method may include: the base station receives a D2D communication connection request sent by the transmitting end, and the D2D communication connection request is used to indicate that the transmitting end It is necessary to establish a D2D communication connection with the receiving end; the base station sends first indication information to the transmitting end, and the first indication information includes an indication generated by the base station according to the D2D communication connection request that the receiving end feeds back transmission status information and/or the first time-frequency resource information used in channel state information. By adopting the present invention, the utilization rate of resources can be improved, and the communication efficiency of D2D can be improved.

Description

A device-to-device D2D communication method, related equipment and system

technical field

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

Background technique

In order to improve system efficiency and resource utilization, when the distance between terminals is relatively close, the terminals can perform Device to Device (D2D) communication without forwarding through the base station. D2D communication is a kind of control in the base station. Next, it is a technology that allows terminals to communicate directly by multiplexing cell resources, that is, D2D communication is to change the communication method originally forwarded by the base station into direct communication between terminals that need to communicate, but the base station still performs D2D communication with the terminal. The terminal maintains the transmission of control information, realizes interference control, and allocates resources for the D2D terminal, so that the D2D communication works in the licensed frequency band.

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

Contents of the invention

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

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

The base station receives the D2D communication connection request sent by the transmitting end, and 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 base station sends first indication information to the transmitting end, where the first indication information includes information generated by the base station according to the D2D communication connection request when instructing the receiving end to feed back transmission state information and/or channel state information. Information about the first time-frequency resource used.

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

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

With reference to the first possible implementation of the first aspect, in a second possible implementation, the base station receives the transmission status fed back by the receiving end at a designated time-frequency resource position according to the first time-frequency resource information After the information, also include:

The base station sends second indication information to the transmitting end, where the second indication information includes new data indication signaling NDI generated by the base station according to the transmission state information or the channel state information, and the NDI is used for Instructing the transmitting end to decide whether to retransmit the current data packet according to the value of the NDI.

With reference to the second possible implementation of the first aspect, in a third possible implementation, the second indication information further includes the information generated by the base station according to the transmission state information and/or channel state information. The transmitting end performs updating time-frequency resource information for D2D communication with the receiving 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 In a fourth possible implementation manner, the base station sends the first indication information to the transmitting end, including:

The base station carries the first indication information through downlink control information or high-layer signaling and sends it 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 In a fifth possible implementation manner, the base station sends the first indication information to the transmitting end, including:

The base station carries the first indication information through an information field in the downlink control information and sends it 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 combination 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 The second time-frequency resource information for performing D2D communication between the transmitting end and the receiving end generated 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 , combined with the fourth possible implementation of the first aspect, or, combined with the fifth possible implementation of the first aspect, or, combined with the sixth possible implementation of the first aspect, in the seventh possible implementation In an implementation manner, the first time-frequency resource information includes time-domain resource location information 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 , combined with the fourth possible implementation of the first aspect, or, combined with the fifth possible implementation of the first aspect, or, combined with the sixth possible implementation of the first aspect, in the eighth possible implementation 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, and the time-domain resource location indication is used to indicate a time-domain resource location is 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 position where the transmitting end performs D2D communication with the receiving end is the nth subframe; the pre-agreed The time domain resource position of is the n+kth subframe in the uplink transmission link performed by 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 , combined with the fourth possible implementation of the first aspect, or, combined with the fifth possible implementation of the first aspect, or, combined with the sixth possible implementation of the first aspect, or, combined with the first aspect The seventh possible implementation, or the eighth possible implementation in combination with the first aspect, or the ninth possible implementation in combination with the first aspect, in the tenth possible implementation, all The first indication information further includes information indicating whether the receiving end needs to perform transmission state information and/or channel state information feedback.

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

The transmitting end sends a D2D communication connection request to the base station, and 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 sent by the base station, the first indication information includes indicating the first time-frequency resource information used when the receiving end feeds back transmission state information and/or channel state information, and the transmission state 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 manner, the first indication information further includes the second information of the D2D communication between the transmitting end and the receiving end generated by the base station according to 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 manner of the second aspect, in the second possible implementation manner, 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 a specified time-frequency resource according to the second time-frequency resource information.

In combination with the second aspect, or in combination with the first possible implementation manner of the second aspect, or in combination with the second possible implementation manner of the second aspect, in a third possible implementation manner, the transmitting terminal sends After the receiving end sends the D2D control information, it also includes:

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

The transmitting end decides whether to retransmit the current data packet according to the value of the NDI.

With reference to the third possible implementation of the second aspect, in a fourth possible implementation, the transmitting end determines whether to retransmit data according to the value of the NDI, including:

judging whether the value of the NDI is reversed;

If flipped, clear the current transmission buffer and transmit new data packets;

If not reversed, retransmit the current data packet.

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

In combination 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 position of is the nth subframe; the transmitting end performs uplink and downlink through OFDM symbols different from the OFDM symbols used in the D2D communication on the nth subframe Link transmission, where n is a positive integer.

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

In combination with 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 , combined with the fourth possible implementation of the second aspect, or, combined with the fifth possible implementation of the second aspect, or, combined with the sixth possible implementation of the second aspect, in the eighth possible implementation In an implementation, 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, and the time-domain resource location indication is used to indicate a time-frequency resource location is the pre-agreed time-frequency resource location.

With reference to the eighth possible implementation manner of the second aspect, in a ninth possible implementation manner, the time-domain resource position where the transmitting end performs D2D communication with the receiving end is the nth subframe; the pre-agreed The time domain resource position of is the n+kth subframe in the uplink transmission link performed by the receiving end, where n and k are both positive integers.

In combination with 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, or the eighth possible implementation in combination with the second aspect, or the ninth possible implementation in combination with the second aspect, in the tenth possible implementation, all 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, and the preset time-frequency resource location is configured by the base station through high-layer signaling.

In a third aspect, an embodiment of the present invention provides a device-to-device 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 the first time-frequency resource information used when instructing the receiving end to feed back transmission state information and/or channel state information;

The receiving end sends transmission state information and/or channel state information to the base station on a designated time-frequency resource according to the first time-frequency resource information, and the transmission state information and/or channel state information is used by the base station according to The transmission state information or channel state information instructs the transmitter to retransmit the current data packet, or clear the current transmission buffer and transmit a new data packet, wherein the transmission state information includes ACK or NACK information.

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

The receiving end feeds back transmission state information and/or channel state information to the base station at a 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 combination with the third aspect, or in combination with the first possible implementation manner of the third aspect, in a second possible implementation manner, the D2D control information further includes Second time-frequency resource information.

In combination with the third aspect, or in combination with the first possible implementation manner of the third aspect, in a third possible implementation manner, the D2D control information further includes The updated time-frequency resource information for D2D communication between the transmitting end and the receiving end generated by the status information.

In combination 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 position of is the nth subframe; the receiving end performs uplink and downlink through OFDM symbols different from the OFDM symbols used in the D2D communication on the nth subframe Link transmission, where n is a positive integer. It should be noted that the nth subframe in the embodiment of the present invention does not refer to a specific frame in a specific resource period, but refers to a subframe at the same position in any time domain resource period.

In combination 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 positions of are 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 n1th subframe position, wherein , the n1th subframe is located between the n0th subframe and the n2th subframe in the time domain, and the n0th subframe and the n2th subframe do not include resources for performing D2D data communication, The said n0, n1 and n2 are positive integers.

With reference to the third aspect, in a sixth possible implementation manner, the time-domain resource position in the first time-frequency resource information is the mth subframe; The OFDM symbols of the OFDM symbols corresponding to the time-domain resource positions in the first time-frequency resource information perform uplink and downlink transmission, where m is a positive integer.

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

In combination with 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 , combined with the fourth possible implementation of the third aspect, or, combined with the fifth possible implementation of the third aspect, or, combined with the sixth possible implementation of the third aspect, in the eighth possible implementation 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, and 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 position where the transmitting end and the receiving end perform D2D communication is the nth subframe; the pre-agreed time The domain resource location is the n+kth subframe in the uplink transmission link performed by 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;

Wherein, the storage unit is used to store program codes, and the processing unit is used to call the program codes stored in the storage unit to perform the following steps:

receiving a D2D communication connection request sent by the transmitting end through the input unit, 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 first indication information to the transmitting end through the output unit, where the first indication information includes an instruction generated 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 The first time-frequency resource information used at the time.

With reference to the fourth aspect, in a first possible implementation manner, the processing unit is further configured to:

After sending the first indication information to the transmitting end through the output unit, receiving the transmission state information and/or channel state information fed back by the receiving end at a designated time-frequency resource position according to the first time-frequency resource information, the The above transmission status information includes ACK or NACK information.

With reference to the first possible implementation of the fourth aspect, in a second possible implementation, the processing unit is further configured to:

After receiving the transmission status information fed back by the receiving end through the input unit at a designated time-frequency resource position according to the first time-frequency resource information, sending second indication information to the transmitting end through the output unit, the The second indication information includes the new data indication signaling NDI generated by the base station according to the transmission state information or the channel state information, and the NDI is used to instruct the transmitting end to decide whether to carry out the current data according to the value of the NDI. Packet retransmission.

With reference to the second possible implementation of the fourth aspect, in a third possible implementation, the second indication information further includes the information generated by the base station according to the transmission state information and/or channel state information. The transmitting end performs updating time-frequency resource information for D2D communication with the receiving end.

In combination with 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 In a fourth possible implementation manner, the processing unit is configured to send the first indication information to the transmitting end through the output unit, specifically:

Carrying the first indication information through the output unit through downlink control information or high-layer signaling and sending it to the transmitting end.

In combination with 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 In a fifth possible implementation manner, the processing unit is configured to send the first indication information to the transmitting end through the output unit, including:

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

In combination with 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, in a sixth possible implementation, the first indication information further includes the base station The second time-frequency resource information for performing D2D communication between the transmitting end and the receiving end generated according to the D2D communication connection request.

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

In combination with 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 , combined with the fourth possible implementation of the fourth aspect, or, combined with the fifth possible implementation of the fourth aspect, or, combined with the sixth possible implementation of the fourth aspect, in the eighth possible implementation 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, and the time-domain resource location indication is used to indicate a time-domain resource location is the pre-agreed time domain resource location.

With reference to the eighth possible implementation manner of the fourth aspect, in a ninth possible implementation manner, the time-domain resource position where the transmitting end performs D2D communication with the receiving end is the nth subframe; the pre-agreed The time domain resource position of is the n+kth subframe in the uplink transmission link performed by the receiving end, where n and k are both positive integers.

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

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

Wherein, the storage unit is used to store program codes, and the processing unit is used to call the program codes stored in the storage unit to perform the following steps:

sending a D2D communication connection request to the base station through the output unit, 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 through the input unit, the first indication information includes indicating the first time-frequency resource information used when the receiving end feeds back transmission state information and/or channel state information, and the transmission Status information includes ACK or NACK information;

sending D2D control information to the receiving end through the output unit, 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 when the transmitting end performs D2D communication with the receiving end generated by the base station according to the D2D communication connection request. frequency resource information; the D2D control information further includes the second time-frequency resource information.

With reference to the first possible implementation manner of the fifth aspect, in a second possible implementation manner, the processing unit is further configured to:

After sending the D2D control information to the receiving end through the output unit, perform D2D data transmission with the transmitting end on the designated 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 manner of the fifth aspect, or in combination with the second possible implementation manner of the fifth aspect, in the third possible implementation manner, the processing unit further uses At:

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

In combination with the third possible implementation of the fifth aspect, in the fourth possible implementation, it is used to determine whether to retransmit data according to the value of the NDI, specifically:

judging whether the value of the NDI is reversed;

If flipped, clear the current transmission buffer and transmit new data packets;

If not reversed, retransmit the current data packet.

With reference to the third possible implementation manner of the fifth aspect, in a fifth possible implementation manner, the second indication information further includes the The transmitting end performs updating time-frequency resource information for D2D communication with the receiving end.

In combination 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 position of is the nth subframe; the transmitting end performs uplink and downlink through OFDM symbols different from the OFDM symbols used in the D2D communication on the nth subframe Link transmission, where n is a positive integer.

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

In combination with the fifth aspect, or in combination with the first possible implementation manner of the fifth aspect, or in combination with the second possible implementation manner of the fifth aspect, or in combination with the third possible implementation manner of the fifth aspect, or , combined with the fourth possible implementation of the fifth aspect, or, combined with the fifth possible implementation of the fifth aspect, or, combined with the sixth possible implementation of the fifth aspect, in the eighth possible implementation In an implementation, 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, and the time-domain resource location indication is used to indicate a time-frequency resource location is the 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 position where the transmitting end performs D2D communication with the receiving end is the nth subframe; the pre-agreed The time domain resource position of is the n+kth subframe in the uplink transmission link performed by the receiving end, where n and k are both positive integers.

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

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

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

Wherein, the storage unit is used to store program codes, and the processing unit is used to call the program codes stored in the storage unit to perform the following steps:

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

Send transmission state information and/or channel state information to the base station through the output unit on a designated time-frequency resource according to the first time-frequency resource information, the transmission state information and/or channel state information is used by the base station According to the transmission state information or channel state information, instruct the transmitting end to retransmit the current data packet, or clear the current transmission buffer and transmit a new data packet, wherein the transmission state information includes ACK or NACK information.

With reference to the sixth aspect, in a first possible implementation manner, the processing unit is configured to send the transmission status information and /or channel state information, specifically:

According to the first time-frequency resource information and the acquired preset system frame structure, feeding back transmission state information and/or channel state information to the base station at a specified time-frequency resource position in the uplink control information through the output unit .

In combination with the sixth aspect, or in combination with the first possible implementation manner of the sixth aspect, in a second possible implementation manner, the D2D control information further includes 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 manner, the D2D control information further includes The updated time-frequency resource information for D2D communication between the transmitting end and the receiving end generated by the status information.

In combination with the second possible implementation manner of the sixth aspect, or, in combination with the third possible implementation manner of the sixth aspect, in a fourth possible implementation manner, the transmitting end performs D2D communication with the receiving end The time-domain resource position of is the nth subframe; the receiving end performs uplink and downlink through OFDM symbols different from the OFDM symbols used in the D2D communication on the nth subframe Link transmission, where n is a positive integer.

In combination 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 positions of are 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 n1th subframe position, wherein , the n1th subframe is located between the n0th subframe and the n2th subframe in the time domain, and the n0th subframe and the n2th subframe do not include resources for performing D2D data communication, Said n0, n1 and n2 are positive integers.

With reference to the sixth aspect, in a sixth possible implementation manner, the time-domain resource position in the first time-frequency resource information is the mth subframe; The OFDM symbols of the OFDM symbols corresponding to the time-domain resource positions in the first time-frequency resource information perform uplink and downlink transmission, where m is a positive integer.

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

In combination with 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 , combined with the fourth possible implementation of the sixth aspect, or, combined with the fifth possible implementation of the sixth aspect, or, combined 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, and 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 manner, the time domain resource position where the transmitting end and the receiving end perform D2D communication is the nth subframe; the pre-agreed time The domain resource location is the n+kth subframe in the uplink transmission link performed by the receiving end, where n and k are both positive integers.

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

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

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

The receiving end is the receiving end combined with any implementation manner of the sixth aspect.

Implementing the embodiment of the present invention has the following beneficial effects:

In the embodiment of the present invention, the base station receives the D2D communication connection request sent by the transmitter, and the D2D communication connection request is used to indicate that the transmitter needs to establish a D2D communication connection with the receiver; the base station sends the first Indication information, where the first indication information includes the first time-frequency resource information generated by the base station according to the D2D communication connection request and used when instructing the receiving end to feed back transmission state information and/or channel state information. That is, in the D2D communication mode, the transmission state information feedback 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 efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a diagram of a D2D communication network architecture provided by an embodiment of the present invention;

FIG. 2 is a flow chart of D2D information transmission provided by an embodiment of the present invention;

FIG. 3 is a schematic flowchart of a device-to-device D2D communication method provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of resource time division multiplexing provided by an embodiment of the present invention;

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

FIG. 6 is a schematic diagram of a D2D data transmission frame structure provided by an embodiment of the present invention;

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

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

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

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

Fig. 11 is a schematic structural diagram of the transmitting terminal provided by the present invention;

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

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

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The terms "first", "second", "third" and "fourth" in the description and claims of the present invention and the drawings are used to distinguish different objects, rather than to describe a specific order . Furthermore, the terms "include" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or units inherent in these processes, methods, products or apparatuses.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

Hereinafter, some terms used in this application are explained to facilitate the understanding of those skilled in the art.

1) The transmitting end/receiving end can be user equipment (User Equipment, UE) with D2D communication function, UE can be called access terminal, terminal equipment, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device. The UE may be a cellular phone, a cordless phone, a smart phone, a Session Initiation Protocol (Session Initiation Protocol, SIP) phone, a Wireless Local Loop (Wireless Local Loop, WLL) station, a smart bracelet, a smart wearable device, an MP3 player (Moving PictureExperts Group Audio Layer III, moving picture expert compression standard audio layer 3), MP4 (MovingPicture Experts Group Audio Layer IV, moving picture expert compression standard audio layer 3) player, personal digital processing (Personal Digital Assistant, PDA), with wireless Handheld devices with communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, and terminal devices in future 5G networks, etc.

2) The base station can 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 refers to the base station equipment in the future 5G network, which is not limited in the present invention.

3) "Multiple" means two or more. "And/or" describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B may indicate: A exists alone, A and B exist simultaneously, and B exists independently. The character "/" generally indicates that the contextual objects are an "or" relationship.

In order to facilitate understanding of the embodiments of the present invention, the D2D communication network architecture based on the embodiments of the present invention will be described below first. Please refer to Fig. 1. Fig. 1 is a diagram of a D2D communication network architecture provided by an embodiment of the present invention. The network architecture includes a core network, a base station, a transmitter, and a receiver. The base station is responsible for the D2D connection between the transmitter and the receiver. And communication allocates resources, and the transmitting end and receiving end perform D2D connection according to the resources allocated by the base station, and directly carry out D2D communication, in which the core network mainly provides data support and related services for the D2D communication process. Please refer to FIG. 2. FIG. 2 is a flow chart of D2D information transmission provided by the embodiment of the present invention. It should be noted that, in the prior art, after receiving the D2D communication connection request from the transmitter, the base station sends a downlink control message to the transmitter. Information, indicating its time-frequency resources for D2D communication. Subsequently, after receiving the downlink control information sent by the base station, the transmitting end first sends D2D control information to the receiving end according to the indication information, and the D2D control information is used to indicate the time-frequency resource for the D2D transmitting end to send D2D data information. Then send the D2D data information to the receiving end, and then repeatedly send the D2D data information three times in time division, and after sending the D2D data information four times in total, this D2D sending ends. 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 can be understood that the above network architecture in FIG. 1 is only a preferred implementation manner in the embodiment of the present invention, and the network architecture in the embodiment of the present invention includes but not limited to the above network architecture.

Embodiments of the present application are described below in conjunction with the accompanying drawings.

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

Step S301: the transmitter 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, it is necessary to initiate a D2D communication connection request to the base station, and the base station can allocate communication resources for the transmitting end and the receiving end according to the D2D communication connection request, so that the two terminals can Direct communication of D2D data information, the transmitted data no longer needs to be forwarded by the base station, so the load of the base station can be reduced and the capacity of the system can be increased.

Step S302: the base station receives the D2D communication connection request sent by the transmitter.

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

Specifically, after receiving the D2D communication connection request sent by the transmitting end, the base station generates first indication information according to the request, wherein 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 frequency domain resources used when the receiving end feeds back the transmission state information and/or channel state information, and the transmission state information includes ACK or NACK information. Further, since the purpose of sending the D2D request connection by the transmitting end is to perform D2D communication, the first indication information includes not only the first time-frequency resource information used by the receiving end for feeding back transmission state information and/or channel state information, but also It must include the second time-frequency resource information used by the transmitting end and the receiving end for 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 many ways about how the base station bears the first indication information and how the first indication information includes the first time-frequency resource 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 it to the transmitting end, that is, it does not need to redefine or increase the type of bearing information, and directly carries the first indication information in the existing downlink control information, improving the utilization of the transmission system Rate.

In a possible implementation manner, the base station sends the first indication information to the transmitting end, specifically: the base station carries the first indication information by adding a new predefined information field to the downlink control information or multiplexing an existing information field. Indicate information and send it to the transmitter. For example, according to the definition of the LTE standard, in the downlink control information, the pre-defined format DCI Format 5 is used to carry the related control information or indication information of D2D communication, but in the embodiment of the present invention, it can be carried in In this predefined format, the first indication information is carried by newly adding a predefined information field. For example, the base station may define in the field Feedback Flag the first time-frequency resource information used by the receiving end to feed back transmission state information and/or channel state information in the first indication information, so as to indicate that the receiving end is in the indicated time-frequency The resource location performs feedback of transmission status information. Optionally, the function of carrying the first indication information may also be realized by reusing existing information fields in a predefined format, that is, redefining existing information fields. For example, in the DCI Format 5 format, there is a field Time Resource Pattern (7 bits long), and 20 possible situations are reserved in this field, so it can be used to define a new indication function. Further, the first indication information may also carry indication information indicating whether the receiving end performs transmission status information feedback, for example, by defining {0,0,0,0,0,0,0} as an indication that the receiving end feedbacks An indication of the current transfer status. That is: if the information in the TimeResource Pattern field in the downlink control information of the base station is {0,0,0,0,0,0,0}, it means that for this D2D transmission, the receiving end needs to feed back transmission status information and/or channel status information.

In a possible implementation manner, 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, clearly indicates the time-domain resource location and frequency-domain resource location information. position, so that the receiving end can directly use 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, and the time-domain resource location indication is used to indicate when The domain resource location is a pre-agreed time domain resource location. For example, if the time-domain resource position for D2D communication between the transmitting end and the receiving end is the nth subframe; the pre-agreed time-domain resource position is the n+kth subframe in the uplink transmission link of the receiving end, where n and k All 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. Instead, when the terminal (including the transmitting end and the receiving end) accesses the base station, it is pre-agreed to feed back the transmission status information and /or the position 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 a frequency-domain resource position and a time-domain resource position indication (which may be an indication of a preset format information, or an instruction that does not contain any information). Similarly, the first time-frequency resource information may not include specific frequency-domain resource information, that is, it only includes an indication of the starting position of the feedback frequency-domain resource, and the specific starting position of the frequency-domain resource is pre-indicated by the high-level signaling of the base station , which can be understood as the default starting position of frequency domain resources. For example, the feedback position in the time domain can be predefined according to the LTE standard. Then you can define the field Time Resource Pattern as {0,0,0,0,0,0,1} as the starting position of the first subband for feedback; define {0,0,0,0, 0,1,0}, as the starting position of the second subband for feedback. Here, the frequency domain resource positions occupied by the subbands are predefined, and are notified to the transmitting end by high-layer signaling of the base station.

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

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

Specifically, the transmitting end generates D2D control information after receiving the first indication information sent by the base station, and the D2D control information includes the first time-frequency resource information, that is, the D2D control information generated by the transmitting end may be a response to the first indication information. Simple copying of the first time-frequency resource information in , may also be based on the first time-frequency resource information to perform related processing, and finally generate D2D control information including the first time-frequency resource information, the present invention Not specifically limited. In the specific implementation process, the D2D control information sent by the transmitter to the receiver can be carried by the downlink control information of the base station. For example, the above-mentioned D2D control information can be carried by multiplexing existing fields. The control information is forwarded to the receiving end through the field Time Resource Pattern and the field Frequency HoppingFlag in SCI Format 0. It can be understood that the object sent by the transmitting end may be a specific receiving end or multiple specific receiving ends.

In a possible implementation manner, since the first indication information also includes the second time-frequency resource information for D2D communication between the transmitting end and the receiving end generated by the base station according to the D2D communication connection request, and the D2D control information also includes the Describe the second time-frequency resource information. Therefore, the transmitting end may perform D2D data information transmission with the transmitting end on the designated 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 instructing the receiving end to feed back transmission state information and/or channel state information. More specifically, the first time-frequency resource information includes time-domain resource location information 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, and 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, the transmitting end sends the D2D control information to the receiving end, specifically: the transmitting end sends the D2D control information to the receiving end at a preset time-frequency resource location, and the preset time-frequency resource location is the Signaling is configured.

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

Specifically, the transmission state information is used by the base station to instruct the transmitting end whether to retransmit the current data packet according to the transmission state information, and the transmission state information includes ACK or NACK information. That is, according to whether the receiving end has successfully received the D2D data packet sent by the transmitting end (the receiving end will perform verification every time it receives a data packet, if the verification passes, it means that the reception is successful; The transmission state information including ACK or NACK information is fed back, so that the base station can give instructions to the transmitting end according to the fed back transmission state information and/or channel state information. Further, when the transmission status information fed back by the receiving end to the base station contains ACK, it indicates that the receiving end has successfully received the D2D data, so the base station can indicate to the transmitting end that there is no need to retransmit data at present (because In the prior art, there are four times of blind transmission, that is, no matter whether the transmission is successful or not, it must be transmitted four times). Assuming that the transmitting end transmits the second time, the receiving end receives successfully, then the base station can issue an instruction to the transmitting end to stop the data packet currently being retransmitted, and transmit the next new data packet, which can avoid the receiving end from When the reception is successful, the transmitter continues to waste resources caused by blind transmission, which saves communication resources and improves transmission efficiency.

In a possible implementation, the location of the time-domain resource for the D2D communication between the transmitting end and the receiving end is the nth subframe; The OFDM symbol of the OFDM symbol performs uplink and downlink transmission, where n is a positive integer. In general, the uplink control information fed back by the D2D transmitter/receiver to the base station (non-D2D feedback information) and the transmission and reception of D2D data can be transmitted in the same subframe, that is, this method can make D2D communication and Normal cellular communication is carried out at the same time, improving communication efficiency. As shown in FIG. 4 , FIG. 4 is a schematic diagram of resource time division multiplexing provided by an embodiment of the present invention, where D2D data information and LTE uplink control information perform resource time division multiplexing.

In a possible implementation, the time-domain resource positions for D2D communication between the transmitting end and the receiving end are located in the n0th subframe and the n2th subframe; then 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 n0th subframe and the n2th subframe do not include the information used for D2D data communication 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 position of the first time-frequency resource is in subframe n1, the position of the second time-frequency resource is n0 or the subframe position of the updated time-frequency resource is n2, and n0, n1, and n2 are positive integers; n0<n1 exists <n2; resources for transmitting D2D data are not included between 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 type2 subframe, so D2D response can be performed faster to ensure D2D transmission The data delay is smaller and the spectrum utilization rate is improved.

In a possible implementation, when the time-domain resource position in the first time-frequency resource information is the mth subframe; The OFDM symbols of the OFDM symbols corresponding to the resource positions perform uplink and downlink transmission, where m is a positive integer. In general, the uplink data information of the D2D receiver can be transmitted in the same subframe as the D2D feedback transmission status information and/or channel status information. For the receiving end, D2D feedback can be performed, and subframes for uplink and/or downlink transmission can also be performed. Optionally, as shown in FIG. 5, FIG. 5 is a schematic diagram of time division multiplexing of resources provided by the embodiment of the present invention. FIG. 5 shows the specific subframe type and format used by the receiving end for transmission in time division multiplexing mode.

In a possible implementation manner, according to the first time-frequency resource information and the acquired preset system frame structure (obtained when accessing the base station), the receiving end sets the time-frequency specified in the uplink control information The resource location feeds back transmission state information and/or channel state information to the base station. The frame structure of the LTE system is shown in Figure 6. Figure 6 is a schematic diagram of the D2D data transmission frame structure provided by the embodiment of the present invention. In a wireless frame, there are 10 subframes. For the TDD system, there are different types of subframes and uplink transmission Subframes also have downlink transmission subframes, which are called uplink and downlink ratios here. Feedback information can be transmitted only in an uplink subframe; and for an FDD system, there is an opportunity for uplink transmission in every subframe. If in subframe n, the receiving end receives D2D data information, then the receiving end feeds back transmission state information or channel state information on the uplink transmission opportunity of n+k subframes, where k=4 can be realized for FDD in LTE, For TDD, the size of k is related to the subframe n and the uplink-downlink configuration of the system, for example, when the configuration is 2, and n=2, then k=5. It can be understood that the indication of time-frequency resources can also be performed by the base station. The embodiment of the present invention only provides an example of indirect indication of time-domain resources. The specific embodiment of the indirect indication of time-frequency resources by the base station and the principle of this embodiment Same, no more details. In the embodiment of the present invention, the overhead of control signaling can be saved by indirectly indicating time-domain resources.

In the embodiment of the present invention, the base station receives the D2D communication connection request sent by the transmitter, and the D2D communication connection request is used to indicate that the transmitter needs to establish a D2D communication connection with the receiver; the base station sends the first Indication information, where the first indication information includes the first time-frequency resource information generated by the base station according to the D2D communication connection request and used when instructing the receiving end to feed back transmission state information and/or channel state information. That is, in the D2D communication mode, the transmission state information feedback 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 efficiency.

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

Step S701: the transmitter sends a D2D communication connection request to the base station.

Step S702: the base station receives the D2D communication connection request sent by the transmitter.

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 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 can refer to step S301 to step S307 in the embodiment provided in FIG. 3 correspondingly, and the specific implementation manner will not be repeated here.

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

Specifically, after sending the first indication information, the base station will receive the transmission state information fed back by the receiving end according to the time domain resource position (feedback timing) and the frequency domain resource position 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 channel state information fed back by the receiving end, the base station generates second indication information according to the transmission state information, and the second indication information includes that the base station generates according to the ACK or NACK information New data indicator signaling (New Data indicator, NDI), where the NDI is used to instruct the transmitting end to decide whether to retransmit 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, and when the base station receives ACK information contained in the transmission status information fed back by the receiving end, it flips the NDI once (for example, flipping from 0 To 1), when the base station receives NACK information in the transmission status information fed back by the receiving end, it keeps the value of NDI unchanged, that is, does not flip (0 continues to remain 0), so that the transmitting end can flip according to the value of the NDI , so as to decide whether to continue the retransmission of the current data packet. In the specific implementation process, the information of the field Frequency Hopping Flag (1 bit long) can be selected in the DCIFormat 5 format as the new data indication signaling NDI (the information of this field was originally used to indicate whether the D2D transmitter needs to use frequency hopping for transmission. ), if the indication information in the field Time Resource Pattern is indication information indicating whether the receiving end performs feedback of transmission information, then the information in the field Frequency Hopping Flag automatically becomes data indicating whether the current transmission is retransmission. For example: According to the above definition, when the information transmitted in the field Time Resource Pattern is {0,0,0,0,0,0,0}, if the information in the field Frequency Hopping Flag is {0}, it means that the current transmission is Retransmission data; if the information in the field Frequency Hopping Flag is {1}, it means that the current transmission is non-retransmission 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, and sequences of multiple fields in the first indication information and the second indication information are configured to be the same, while the first indication information The only difference between the indication information and the second indication information is that different values are filled in the same field (information of the same type).

In a possible implementation manner, in addition to the NDI, the second indication information also includes updated time-frequency resource information generated by the base station according to the ACK or NACK information in the transmission state information for the D2D communication between the transmitting end and the receiving end. The meaning of updating the 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 effect is even adjusted. For example, when a lot of transmission status information including ACK is received, it can be considered that the currently used time-frequency resource is more ideal and the resource is of higher quality, so it can continue to be maintained without adjustment, but if the transmission status information including NACK is received For a long time, it can be considered that the time-frequency resources currently used are poor, and there may be more data transmission failures due to congestion or interference. Therefore, it is necessary to update the allocated time-frequency resources in real time, which is conducive to improving 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, the transmission state information includes ACK or NACK information, and the second indication The information includes the new data indication signaling NDI generated by the base station according to the ACK or NACK information; after the transmitting end sends D2D control information to the receiving end (also after the transmitting end and the receiving end perform D2D data transmission), the The second indication information sent by the base station in step S509 is received.

Step S711: The transmitter determines whether to retransmit the current data packet according to the value of the NDI.

Specifically, the transmitting end determines whether to perform

Retransmission of the current packet. Further, the transmitting end determines whether to retransmit data according to the value of the NDI. The specific process is: the transmitting end judges whether the value of the NDI is reversed; if it is reversed, the transmitting end stops sending the currently sent data packet and clears The current transmission buffer is used to transmit new data packets, and when the value of NDI remains unchanged (that is, not inverted), the transmitter will continue to retransmit the current data packet (until the indicated number of times), and the receiver will also It will continue to receive the retransmission data packet, store it in the received data buffer, and merge and decode it with the previous version. Furthermore, in the process of sending D2D data information from the transmitting end to the receiving end (the information includes the value of NDI), the receiving end can also decide whether to clear the buffer of the received data packet according to the value of NDI, although the current In the prior art, the cache is cleared after receiving four times, but after adopting the technical solution of the present invention, it is possible to clear the cache in advance and start receiving new data after the data packet is successfully received for example once or twice, which is beneficial to improve The capacity of received data, thus freeing up more space for storage of new data packets.

In a possible implementation manner, the time-domain resource position where the transmitting end performs D2D communication with the receiving end is the nth subframe; The OFDM symbols used for communication perform uplink and downlink transmissions, where n is a positive integer.

In the embodiment of the present invention, in the specific implementation and application process, for example, in the LTE evolution system, a new subframe structure can be used for transmission, and the length of the domain resource at this time can be less than 1ms subframe length, so that the transmitting end can send D2D data information and Sending LTE uplink control information is multiplexed in terms of resources in time. The transmitter receives downlink data information in the third subframe. According to the predefined feedback sequence, the terminal needs to send uplink control information to the base station in the seventh subframe to inform the first 3 Whether the data received in the subframe is successful. If at the same time the terminal serves as the transmitting end, it will send D2D data information in the seventh subframe. Therefore, as shown in FIG. 8 , which is a schematic diagram of time division multiplexing of uplink control information resources provided by an embodiment of the present invention, the transmitting end can 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 sending D2D data information, the transmitter will judge whether to retransmit new data information according to the received downlink control information. If it is instructed to send retransmission data information, retransmission is performed; otherwise, new data information is transmitted. Wherein, when the receiving end feeds back transmission state information and/or channel state information, the timing relationship of the feedback is shown in FIG. If the first indication information does not include the start position of the frequency domain, the frequency domain resource position fed back is the default frequency domain start position configured by high-level signaling. If the first indication information includes indication information of the frequency domain starting position, 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 LTE uplink control information.

In the embodiment of the present invention, the base station receives the D2D communication connection request sent by the transmitter, and the D2D communication connection request is used to indicate that the transmitter needs to establish a D2D communication connection with the receiver; the base station sends the first Indication information, where the first indication information includes the first time-frequency resource information generated by the base station according to the D2D communication connection request and used when instructing the receiving end to feed back transmission state information and/or channel state information. That is, in the D2D communication mode, the transmission state information feedback 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 efficiency.

Please refer to FIG. 10. FIG. 10 is a base station 10 provided by 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 The unit 101 , the storage unit 103 and the processing unit 104 may be connected via a bus or in other ways, where connection via a bus is taken as an example in FIG. 10 . The processing unit 104 invokes the program code in the storage unit 103 to perform the following operations:

Receive a D2D communication connection request sent by the transmitting end through the input unit 101, 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 first indication information to the transmitting end through the output unit 102, where the first indication information includes an instruction generated by the base station according to the D2D communication connection request to indicate when the receiving end feeds back transmission state information and/or channel state information The used first time-frequency resource information.

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

After sending the first indication information to the transmitting end through the output unit 102, receiving the transmission state information and/or channel state information fed back by the receiving end at a designated time-frequency resource position according to the first time-frequency resource information, the Transmission status information includes ACK or NACK information.

In another optional solution, 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 through the input unit 101 at the designated time-frequency resource position according to the first time-frequency resource information, sending a second indication to the transmitting end through the output unit 102 information, the second indication information includes the new data indication signaling NDI generated by the base station according to the transmission state information or the channel state information, and the NDI is used to instruct the transmitting end to decide according to the value of the NDI Whether to retransmit the current packet.

In yet another optional solution, the second indication information further includes an update time of 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. Video resource information.

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

The output unit 102 carries the first indication information through an information field in the downlink control information and sends it to the transmitting end.

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

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

In yet 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, and the time-domain resource location indication uses Indicates that the time-domain resource location is a pre-agreed time-domain resource location.

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

In yet 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, for the functions of the units in the base station 10, reference may be made to the specific implementation manners in the above method embodiments in FIGS. 1-8 , which will not be repeated here.

Please refer to FIG. 11. FIG. 11 is a terminal device 20 provided by an embodiment of the present invention. The terminal device 20 is a transmitting end and may include: an input unit 201, an output unit 202, a storage unit 203, and a processing unit 204. In some embodiments of the present invention Examples. Wherein, the bus is used to realize the communication connection between these components; the input unit 201 may specifically be a touch panel of the terminal, including a touch screen and a touch screen, and is used to detect operation instructions on the touch panel of the terminal; the output unit 202 may include The display screen (Display) of the terminal is used to output and display images or data; the memory 203 can be a high-speed RAM display, or a non-volatile memory (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 away from the aforementioned processor 201 . As shown in FIG. 11 , the memory 203 as a computer display medium may include an operating system, a network communication module, a user interface module, and a data processing program.

Wherein, the storage unit 203 is used to store the program code, and the processing unit 204 is used to call the program code stored in the storage unit to perform the following steps:

Sending a D2D communication connection request to the base station through the output unit 202, 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 through the input unit 201, the first indication information includes indicating the first time-frequency resource information used when the receiving end feeds back transmission state information and/or channel state information, and the transmission state The information includes ACK or NACK information;

Send D2D control information to the receiving end through the output unit 202, where the D2D control information includes the first time-frequency resource information.

In an optional solution, the first indication information further includes second time-frequency resource information generated by the base station according to the D2D communication connection request for the transmitting end to perform D2D communication with the receiving end; 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 sending the D2D control information to the receiving end through the output unit 202, perform D2D data transmission with the transmitting end on the designated time-frequency resource according to the second time-frequency resource information.

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

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

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

judging whether the value of the NDI is reversed;

If flipped, clear the current transmission buffer and transmit new data packets;

If not reversed, retransmit the current data packet.

In yet another optional solution, the second indication information further includes an update time of 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. Video resource information.

In yet another optional solution, the time-domain resource position where the transmitting end performs D2D communication with the receiving end is the nth subframe; the transmitting end differs from the The OFDM symbols used in D2D communication perform uplink and downlink transmissions, where n is a positive integer.

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

In yet 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, and the time-domain resource location indication uses The indicated time-frequency resource location is a pre-agreed time-frequency resource location.

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

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

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

It can be understood that, for the functions of the units in the transmitting end 20, reference may be made to the specific implementation manners in the above method embodiments in FIGS. 1-8 , which will not be repeated here.

Please refer to FIG. 12. FIG. 12 is a terminal device 30 provided by an embodiment of the present invention. The terminal device 30 is a receiving end and may include: an input unit 301, an output unit 302, a storage unit 303, and a processing unit 304. In some embodiments of the present invention Examples. Wherein, the bus is used to realize the communication connection between these components; the input unit 301 may specifically be a touch panel of the terminal, including a touch screen and a touch screen, and is used to detect operation instructions on the touch panel of the terminal; the output unit 302 may include The display screen (Display) of the terminal is used to output and display images or data; the memory 303 can 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 away from the aforementioned processor 301 . As shown in FIG. 12 , the storage unit 303 as a computer display medium may include an operating system, a network communication module, a user interface module, and a data processing program.

Wherein, the storage unit 303 is used to store the program code, and the processing unit 304 is used to call the program code stored in the storage unit 303 to perform the following steps:

Receive the D2D control information sent by the transmitting end through the input unit 301, the D2D control information includes the first time-frequency resource information used when instructing the receiving end to feed back transmission state information and/or channel state information;

According to the first time-frequency resource information, the output unit 302 sends transmission state information and/or channel state information to the base station on the specified time-frequency resource, and the transmission state information and/or channel state information is used by the base station according to The transmission state information or channel state information instructs the transmitter to retransmit the current data packet, or clear the current transmission buffer and transmit a new data packet, wherein the transmission state information includes ACK or NACK information.

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

According to the first time-frequency resource information and the acquired preset system frame structure, the output unit 302 feeds back transmission state information and/or channel state information to the base station at a specified time-frequency resource position in the uplink control information.

In another optional solution, the D2D control information further includes second time-frequency resource information for performing D2D communication between the transmitting end and the receiving end.

In yet another optional solution, the D2D control information further includes an update time and frequency of 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 yet another optional solution, the time-domain resource position where the transmitting end performs D2D communication with the receiving end is the nth subframe; The OFDM symbols used in D2D communication perform uplink and downlink transmissions, where n is a positive integer.

In yet another optional solution, the time-domain resource positions where the transmitting end performs D2D communication with the receiving end are located in the n0th subframe and the n2th subframe; the receiving end is located in the n1th subframe sending the transmission state information and/or the channel state information to the base station, wherein the n1th subframe is located between the n0th subframe and the n2th subframe in the time domain, the Resources for D2D data communication are not included between the n0th subframe and the n2th subframe, and n0, n1, and n2 are positive integers.

In yet another optional solution, the time-domain resource position in the first time-frequency resource information is the mth subframe; The OFDM symbols of the OFDM symbols corresponding to the time-domain resource positions in the frequency resource information perform uplink and downlink transmission, where m is a positive integer.

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

In yet 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, and the time-domain resource location is used for Indicates that the time-frequency resource location is a pre-agreed time-frequency resource location.

In yet another optional solution, the time domain resource position for the D2D communication between the transmitting end and the receiving end is the nth subframe; the pre-agreed time domain resource position is for the receiving end to perform uplink transmission link The n+kth subframe in , where n and k are both positive integers.

It can be understood that, for the functions of the units in the receiving end 30, reference may be made to the specific implementation manners in the above method embodiments in FIGS. 1-8 , which will not be repeated here.

As shown in FIG. 13, a device-to-device D2D communication system provided by the present invention, 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 embodiment of FIG. 10; the transmitting end 402 may be the transmitting end 20 in the embodiment of FIG. 11; the receiving end 403 may be the receiving end 30 in the embodiment of FIG. 12 above. It can be understood that the system 40 in the embodiment of the present invention may also include devices such as servers, small base stations, enterprise network devices, routing devices, switching devices, and service centers.

It can be understood that, the functions of the base station 401, the transmitting end 402, and the receiving end 403 in the system 40 can refer to the specific implementation manners in the above-mentioned method embodiments in FIG. 1-FIG.

An embodiment of the present invention also provides a computer storage medium, wherein the computer storage medium can store a program, and the program includes some or all steps of any one of the device-to-device D2D communication methods described in the above method embodiments when executed.

In the foregoing embodiments, the descriptions of each embodiment have their own emphases, and for parts not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

It should be noted that for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence. Because according to the present invention, certain steps may be carried out in other order or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

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

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

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

If the above integrated units are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to make a computer device (which may be a personal computer, server, or network device, etc., specifically, a processor in the computer device) execute all or part of the steps of the above-mentioned methods in various embodiments of the present invention. Wherein, the aforementioned storage medium may include: U disk, mobile hard disk, magnetic disk, optical disc, read-only memory (English: Read-Only Memory, abbreviation: ROM) or random access memory (English: Random Access Memory, abbreviation: RAM) and other media that can store program codes.

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still understand the foregoing The technical solutions recorded in each embodiment are modified, or some of the technical features are replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (65)

1. a kind of terminal-to-terminal service D2D communication means, it is characterised in that methods described includes：

Base station receives the D2D communication connection requests that transmitting terminal is sent, and the D2D communication connection requests are used to indicate the transmitting terminal Need to establish D2D communication connections with receiving terminal；

The base station sends the first configured information to the transmitting terminal, and first configured information includes the base station according to Used when the instruction receiving terminal feedback transmission status information and/or channel condition information of the generation of D2D communication connection requests The first running time-frequency resource information.

2. the method as described in claim 1, it is characterised in that the base station to the transmitting terminal send the first configured information it Afterwards, in addition to：

Running time-frequency resource position is being specified to receive the biography that the receiving terminal feeds back according to the first running time-frequency resource information in the base station Defeated status information and/or channel condition information, the transmission state information include ACK or nack message.

3. method as claimed in claim 2, it is characterised in that specified according to the first running time-frequency resource information the base station After running time-frequency resource position receives the transmission state information of the receiving terminal feedback, in addition to：

The base station sends the second configured information to the transmitting terminal, and second configured information includes the base station according to Transmission state information or new data the indication signaling NDI, the NDI of channel condition information generation are for indicating the hair End is penetrated to be decided whether to carry out the re-transmission of current data packet according to the value of the NDI.

4. method as claimed in claim 3, it is characterised in that second configured information also includes the base station according to When transmission state information and/or the transmitting terminal of channel condition information generation carry out the renewal of D2D communications with the receiving terminal Frequency resource information.

5. the method as described in claim 1-4 any one, it is characterised in that the base station sends first to the transmitting terminal Configured information, including：

The base station carries first configured information by Downlink Control Information or high-level signaling and sent to the transmitting terminal.

6. the method as described in claim 1-4 any one, it is characterised in that the base station sends first to the transmitting terminal Configured information, including：

The base station carries first configured information by the information field in Downlink Control Information and sent to the transmitting End.

7. method as claimed in any one of claims 1 to 6, it is characterised in that first configured information also includes the base Stand and carry out the second time-frequency money of D2D communications with the receiving terminal according to the transmitting terminal that the D2D communication connection requests generate Source information.

8. the method as described in claim 1-7 any one, it is characterised in that the first running time-frequency resource information includes described The time-domain resource position and frequency domain resource positional information that base station determines according to the D2D communication connection requests.

9. the method as described in claim 1-7 any one, it is characterised in that the first running time-frequency resource information includes described The frequency domain resource position and time-domain resource position instruction that base station determines according to the D2D communication connection requests, the time-domain resource Position instruction is used to indicate that time-domain resource position is the time-domain resource position made an appointment.

10. method as claimed in claim 9, it is characterised in that the transmitting terminal and the receiving terminal carry out D2D communications when Domain resource location is the n-th subframe；The time-domain resource position made an appointment is that the receiving terminal is carried out in uplink link The n-th+k subframes, wherein n and k are positive integer.

11. the method as described in claim 1-10 any one, it is characterised in that first configured information also includes instruction Whether the receiving terminal needs to be transmitted status information and/or the information of information feedback.

12. a kind of terminal-to-terminal service D2D communication means, it is characterised in that methods described includes：

Transmitting terminal sends D2D communication connection requests to base station, and the D2D communication connection requests are used to indicate the transmitting terminal needs D2D communication connections are established with receiving terminal；

The transmitting terminal receives the first configured information that base station is sent, and first configured information includes indicating that the receiving terminal is anti- Used first running time-frequency resource information when presenting transmission state information and/or channel condition information, the transmission state packet Include ACK or nack message；

The transmitting terminal sends D2D control information to the receiving terminal, and the D2D control information includes first running time-frequency resource Information.

13. method as claimed in claim 12, it is characterised in that first configured information also includes the base station according to institute The transmitting terminal for stating the generation of D2D communication connection requests carries out the second running time-frequency resource information of D2D communications with the receiving terminal；Institute Stating D2D control information also includes the second running time-frequency resource information.

14. method as claimed in claim 13, it is characterised in that the transmitting terminal sends D2D control letters to the receiving terminal After breath, in addition to：

The transmitting terminal carries out D2D numbers on specified running time-frequency resource according to the second running time-frequency resource information with the transmitting terminal According to transmission.

15. the method as described in claim 12-14 any one, it is characterised in that the transmitting terminal is sent out to the receiving terminal After sending D2D control information, in addition to：

The transmitting terminal receives the second configured information that the base station is sent, and second configured information is the base station according to connecing What the transmission state information or channel condition information for the receiving terminal feedback received generated, the transmission state information includes ACK Or nack message, second configured information include the new data that the base station generates according to the ACK or nack message and indicated Signaling NDI；

The transmitting terminal decides whether to carry out the re-transmission of current data packet according to the value of the NDI.

16. method as claimed in claim 15, it is characterised in that the transmitting terminal according to the value of the NDI decide whether into The re-transmission of row data, including：

Judge whether the value of the NDI overturns；

If upset, current transmission caching is removed, carries out the transmission of new packet；

If not overturning, the re-transmission of current data packet is carried out.

17. method as claimed in claim 15, it is characterised in that second configured information also includes the base station according to institute State the transmitting terminal and the renewal of receiving terminal progress D2D communications of transmission state information and/or channel condition information generation Running time-frequency resource information.

18. the method as described in claim 13 or 17, it is characterised in that the transmitting terminal carries out D2D with the receiving terminal and led to The time-domain resource position of letter is the n-th subframe；The transmitting terminal is made by the D2D communications that are different from n-th subframe The OFDM symbol of orthogonal frequency division multiplex OFDM symbol carries out the transmission of up-link and downlink, and wherein n is positive integer.

19. the method as described in claim 12-18 any one, it is characterised in that the first running time-frequency resource information includes The time-domain resource position and frequency domain resource positional information that the base station determines according to the D2D communication connection requests.

20. the method as described in claim 12-18 any one, it is characterised in that the first running time-frequency resource information includes The frequency domain resource position and time-domain resource position instruction that the base station determines according to the D2D communication connection requests, the time domain Resource location is indicated for indicating that running time-frequency resource position is the running time-frequency resource position made an appointment.

21. method as claimed in claim 20, it is characterised in that the transmitting terminal carries out D2D communications with the receiving terminal Time-domain resource position is the n-th subframe；The time-domain resource position made an appointment is that the receiving terminal carries out uplink link In the n-th+k subframes, wherein n and k are positive integer.

22. the method as described in claim 12-21 any one, it is characterised in that the transmitting terminal is sent out to the receiving terminal D2D control information is sent, including：

The transmitting terminal sends D2D control information, the default time-frequency money on default running time-frequency resource position to the receiving terminal The source position base station is configured by high-level signaling.

23. a kind of terminal-to-terminal service D2D communication means, it is characterised in that methods described includes：

Receiving terminal receives the D2D control information that transmitting terminal is sent, and the D2D control information includes indicating that the receiving terminal feedback passes Used first running time-frequency resource information when defeated status information and/or channel condition information；

The receiving terminal sends transmission state letter on specified running time-frequency resource according to the first running time-frequency resource information to base station Breath and/or channel condition information, the transmission state information and/or channel condition information are used for the base station according to the transmission Status information or channel condition information indicate that the transmitting terminal carries out the re-transmission of current data packet, or remove current transmission caching And the transmission of new packet is carried out, wherein, the transmission state information includes ACK or nack message.

24. method as claimed in claim 23, it is characterised in that the receiving terminal exists according to the first running time-frequency resource information Transmission state information and/or channel condition information are sent to base station on the running time-frequency resource specified, including：

The receiving terminal is according to the first running time-frequency resource information and the predetermined system frame structure obtained, in ascending control information The running time-frequency resource opening position specified to the base station feedback transmission state information and/or channel condition information.

25. the method as described in claim 23 or 24, it is characterised in that the D2D control information also includes the transmitting terminal The second running time-frequency resource information of D2D communications is carried out with the receiving terminal.

26. the method as described in claim 23 or 24, it is characterised in that the D2D control information also includes the base station root D2D communications are carried out according to the transmitting terminal that the transmission state information and/or channel condition information generate and the receiving terminal Update running time-frequency resource information.

27. the method as described in claim 25 or 26, it is characterised in that the transmitting terminal carries out D2D with the receiving terminal and led to The time-domain resource position of letter is the n-th subframe；The receiving terminal is made by the D2D communications that are different from n-th subframe The OFDM symbol of orthogonal frequency division multiplex OFDM symbol carries out the transmission of up-link and downlink, and wherein n is positive integer.

28. the method as described in claim 25 or 26, it is characterised in that the transmitting terminal carries out D2D with the receiving terminal and led to The time-domain resource position of letter is positioned at the n-th 0 subframes and the n-th 2 subframes；The receiving terminal is at the n-th 1 subframe position to the base Transmission of standing passes the transmission state information and/or the channel condition information, wherein, the n-th 1 subframe is located at institute in time domain State between the n-th 0 subframes and the n-th 2 subframes, do not include being used to carry out D2D data communications between the n-th 0 subframe and the n-th 2 subframes Resource, described n0, n1 and n2 are positive integer.

29. method as claimed in claim 23, it is characterised in that the time-domain resource position in the first running time-frequency resource information For m subframes；The receiving terminal passes through the time-domain resource being different from the first running time-frequency resource information in the m subframes The OFDM symbol of orthogonal frequency division multiplex OFDM symbol corresponding to position carries out the transmission of up-link and downlink, wherein m For positive integer.

30. the method as described in claim 23-29 any one, it is characterised in that the first running time-frequency resource information includes The time-domain resource position and frequency domain resource positional information that the base station determines according to the D2D communication connection requests.

31. the method as described in claim 23-29 any one, it is characterised in that the first running time-frequency resource information includes The frequency domain resource position and time-domain resource position instruction that the base station determines according to the D2D communication connection requests, the time domain Resource location is used to indicate that running time-frequency resource position is the running time-frequency resource position made an appointment.

32. method as claimed in claim 31, it is characterised in that the transmitting terminal carries out the time domain of D2D communications with receiving terminal Resource location is the n-th subframe；The time-domain resource position made an appointment is that the receiving terminal is carried out in uplink link N-th+k subframes, wherein n and k are positive integer.

33. a kind of base station, it is characterised in that the base station includes：Input block, output unit, memory cell and processing unit；

Wherein, the memory cell is used for store program codes, and the processing unit is used to call the memory cell storage Program code performs following steps：

The D2D communication connection requests of transmitting terminal transmission are received by the input block, the D2D communication connection requests are used to refer to Show that the transmitting terminal needs establish D2D communication connections with receiving terminal；

First configured information is sent to the transmitting terminal by the output unit, first configured information includes the base station The instruction receiving terminal feedback transmission status information and/or channel condition information generated according to the D2D communication connection requests When used first running time-frequency resource information.

34. base station as claimed in claim 33, it is characterised in that the processing unit is additionally operable to：

After sending the first configured information to the transmitting terminal by the output unit, according to the first running time-frequency resource information In the transmission state information and/or channel condition information for specifying running time-frequency resource position to receive the receiving terminal feedback, the transmission Status information includes ACK or nack message.

35. base station as claimed in claim 34, it is characterised in that the processing unit is additionally operable to：

The receiving terminal is received in specified running time-frequency resource position by the input block according to the first running time-frequency resource information After the transmission state information of feedback, by the output unit to the transmitting terminal send the second configured information, described second Configured information includes the new data that the base station generates according to the transmission state information or the channel condition information and indicated Signaling NDI, the NDI are used for the re-transmission for indicating that the transmitting terminal decides whether progress current data packet according to the value of the NDI.

36. base station as claimed in claim 35, it is characterised in that second configured information also includes the base station according to institute State the transmitting terminal and the renewal of receiving terminal progress D2D communications of transmission state information and/or channel condition information generation Running time-frequency resource information.

37. the base station as described in claim 33-36 any one, it is characterised in that the processing unit, for by described Output unit sends the first configured information to the transmitting terminal, is specially：

First configured information is carried by Downlink Control Information or high-level signaling by the output unit and sent to institute State transmitting terminal.

38. the base station as described in claim 33-36 any one, it is characterised in that the processing unit, for by described Output unit sends the first configured information to the transmitting terminal, including：

First configured information is carried by the information field in Downlink Control Information by the output unit and sent extremely The transmitting terminal.

39. the base station as described in claim 33-38 any one, it is characterised in that first configured information also includes institute When stating the transmitting terminal that base station is generated according to the D2D communication connection requests and carrying out the second of D2D communications with the receiving terminal Frequency resource information.

40. the base station as described in claim 33-39 any one, it is characterised in that the first running time-frequency resource information includes The time-domain resource position and frequency domain resource positional information that the base station determines according to the D2D communication connection requests.

41. the base station as described in claim 33-39 any one, it is characterised in that the first running time-frequency resource information includes The frequency domain resource position and time-domain resource position instruction that the base station determines according to the D2D communication connection requests, the time domain Resource location is indicated for indicating that time-domain resource position is the time-domain resource position made an appointment.

42. base station as claimed in claim 41, it is characterised in that the transmitting terminal carries out D2D communications with the receiving terminal Time-domain resource position is the n-th subframe；The time-domain resource position made an appointment is that the receiving terminal carries out uplink link In the n-th+k subframes, wherein n and k are positive integer.

43. the base station as described in claim 33-42 any one, it is characterised in that first configured information also includes referring to Show whether the receiving terminal needs to be transmitted status information and/or the information of information feedback.

44. a kind of terminal device, it is characterised in that the terminal device is transmitting terminal, and the transmitting terminal includes：Input block, Output unit, memory cell and processing unit；

Wherein, the memory cell is used for store program codes, and the processing unit is used to call the memory cell storage Program code performs following steps：

D2D communication connection requests are sent to base station by the output unit, the D2D communication connection requests are described for indicating Transmitting terminal needs to establish D2D communication connections with receiving terminal；

The first configured information of base station transmission is received by the input block, first configured information includes connecing described in instruction Used first running time-frequency resource information, the transmission state when receiving end feedback transmission status information and/or channel condition information Information includes ACK or nack message；

D2D control information is sent to the receiving terminal by the output unit, when the D2D control information includes described first Frequency resource information.

45. transmitting terminal as claimed in claim 44, it is characterised in that first configured information also include the base station according to The transmitting terminal of the D2D communication connection requests generation carries out the second running time-frequency resource information of D2D communications with the receiving terminal； The D2D control information also includes the second running time-frequency resource information.

46. transmitting terminal as claimed in claim 45, it is characterised in that the processing unit is additionally operable to：

After sending D2D control information to the receiving terminal by the output unit, according to the second running time-frequency resource information On specified running time-frequency resource D2D data transfers are carried out with the transmitting terminal.

47. the transmitting terminal as described in claim 44-46 any one, it is characterised in that the processing unit is additionally operable to：

After sending D2D control information to the receiving terminal by the output unit, by described in input block reception The second configured information that base station is sent, second configured information are the biography that the base station is fed back according to the receiving terminal of reception What defeated status information or channel condition information generated, the transmission state information includes ACK or nack message, second instruction Information includes the new data indication signaling NDI that the base station generates according to the ACK or nack message；According to the value of the NDI Decide whether the re-transmission of progress current data packet.

48. transmitting terminal as claimed in claim 47, it is characterised in that the processing unit, for being determined according to the value of the NDI The fixed re-transmission for whether carrying out data, it is specially：

Judge whether the value of the NDI overturns；

If upset, current transmission caching is removed, carries out the transmission of new packet；

If not overturning, the re-transmission of current data packet is carried out.

49. transmitting terminal as claimed in claim 47, it is characterised in that second configured information also include the base station according to The transmission state information and/or the transmitting terminal of channel condition information generation carry out D2D communications more with the receiving terminal New running time-frequency resource information.

50. the transmitting terminal as described in claim 45 or 49, it is characterised in that the transmitting terminal carries out D2D with the receiving terminal The time-domain resource position of communication is the n-th subframe；The transmitting terminal in n-th subframe by being different from D2D communications institute The OFDM symbol of the orthogonal frequency division multiplex OFDM symbol used carries out the transmission of up-link and downlink, and wherein n is just whole Number.

51. the transmitting terminal as described in claim 44-50 any one, it is characterised in that the first running time-frequency resource packet Include time-domain resource position and the frequency domain resource positional information that the base station determines according to the D2D communication connection requests.

52. the transmitting terminal as described in claim 44-50 any one, it is characterised in that the first running time-frequency resource packet Frequency domain resource position and the time-domain resource position instruction that the base station determines according to the D2D communication connection requests are included, when described Domain resource location is indicated for indicating that running time-frequency resource position is the running time-frequency resource position made an appointment.

53. transmitting terminal as claimed in claim 52, it is characterised in that the transmitting terminal carries out D2D communications with the receiving terminal Time-domain resource position be the n-th subframe；The time-domain resource position made an appointment is that the receiving terminal carries out uplink chain The n-th+k subframes in road, wherein n and k are positive integer.

54. the transmitting terminal as described in claim 44-53 any one, it is characterised in that the processing unit, for passing through State output unit and send D2D control information to the receiving terminal, be specially：

D2D control information is sent to the receiving terminal on default running time-frequency resource position by the output unit, it is described default The running time-frequency resource position base station is configured by high-level signaling.

55. a kind of terminal device, it is characterised in that the terminal device is receiving terminal, and the receiving terminal includes：Input block, Output unit, memory cell and processing unit；

Wherein, the memory cell is used for store program codes, and the processing unit is used to call the memory cell storage Program code performs following steps：

The D2D control information of transmitting terminal transmission is received by the input block, the D2D control information includes connecing described in instruction Used first running time-frequency resource information when receiving end feedback transmission status information and/or channel condition information；

Sent and transmitted to base station on specified running time-frequency resource by the output unit according to the first running time-frequency resource information Status information and/or channel condition information, the transmission state information and/or channel condition information are used for the base station according to institute State transmission state information or channel condition information indicates that the transmitting terminal carries out the re-transmission of current data packet, or remove and work as forward pass It is defeated to cache and carry out the transmission of new packet, wherein, the transmission state information includes ACK or nack message.

56. receiving terminal as claimed in claim 55, it is characterised in that the processing unit, for according to first time-frequency Resource information sends transmission state information and/or channel status on specified running time-frequency resource by the output unit to base station Information, it is specially：

According to the first running time-frequency resource information and the predetermined system frame structure obtained, by the output unit in upload control The running time-frequency resource opening position specified in information is to the base station feedback transmission state information and/or channel condition information.

57. the receiving terminal as described in claim 55 or 56, it is characterised in that the D2D control information also includes the transmitting End carries out the second running time-frequency resource information of D2D communications with the receiving terminal.

58. the receiving terminal as described in claim 55 or 56, it is characterised in that the D2D control information also includes the base station D2D communications are carried out according to the transmitting terminal that the transmission state information and/or channel condition information generate and the receiving terminal Renewal running time-frequency resource information.

59. the receiving terminal as described in claim 57 or 58, it is characterised in that the transmitting terminal carries out D2D with the receiving terminal The time-domain resource position of communication is the n-th subframe；The receiving terminal in n-th subframe by being different from D2D communications institute The OFDM symbol of the orthogonal frequency division multiplex OFDM symbol used carries out the transmission of up-link and downlink, and wherein n is just whole Number.

60. the receiving terminal as described in claim 57 or 58, it is characterised in that the transmitting terminal carries out D2D with the receiving terminal The time-domain resource position of communication is positioned at the n-th 0 subframes and the n-th 2 subframes；The receiving terminal is at the n-th 1 subframe position to described Base station, which is sent, passes the transmission state information and/or the channel condition information, wherein, the n-th 1 subframe is located in time domain Between the n-th 0 subframe and the n-th 2 subframes, do not include being used between the n-th 0 subframe and the n-th 2 subframes carrying out D2D data leading to The resource of letter, described n0, n1 and n2 are positive integer.

61. receiving terminal as claimed in claim 55, it is characterised in that the time-domain resource position in the first running time-frequency resource information It is set to m subframes；The receiving terminal is provided by the time domain being different from the first running time-frequency resource information in the m subframes The OFDM symbol of orthogonal frequency division multiplex OFDM symbol corresponding to source position carries out the transmission of up-link and downlink, wherein M is positive integer.

62. the receiving terminal as described in claim 55-61 any one, it is characterised in that the first running time-frequency resource packet Include time-domain resource position and the frequency domain resource positional information that the base station determines according to the D2D communication connection requests.

63. the receiving terminal as described in claim 55-61 any one, it is characterised in that the first running time-frequency resource packet Frequency domain resource position and the time-domain resource position instruction that the base station determines according to the D2D communication connection requests are included, when described Domain resource location is used to indicate that running time-frequency resource position is the running time-frequency resource position made an appointment.

64. the receiving terminal as described in claim 63, it is characterised in that the transmitting terminal and receiving terminal carry out D2D communications when Domain resource location is the n-th subframe；The time-domain resource position made an appointment is that the receiving terminal is carried out in uplink link The n-th+k subframes, wherein n and k are positive integer.

A kind of 65. terminal-to-terminal service D2D communication systems, it is characterised in that including：Base station, transmitting terminal and receiving terminal, wherein

The base station is the base station as described in claim 33-43 any one；

The transmitting terminal is the transmitting terminal as described in claim 44-54 any one；

The receiving terminal is the receiving terminal as described in claim 55-64 any one.