CN111865480B

CN111865480B - Straight-through link transmission method and terminal

Info

Publication number: CN111865480B
Application number: CN201910351861.7A
Authority: CN
Inventors: 王达; 赵亚利
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2021-10-26
Anticipated expiration: 2039-04-28
Also published as: CN111865480A; WO2020220962A1

Abstract

The embodiment of the invention provides a direct link transmission method and a terminal, wherein the method comprises the following steps: the first terminal determines that the first information is transmitted for N times according to a feedback result, wherein the feedback result is a feedback result fed back by the second terminal aiming at the information sent by the first terminal to the second terminal in the direct link, and N is a positive integer greater than or equal to 1; and the first terminal transmits the first information to the second terminal for N times on the direct link. The embodiment of the invention can improve the transmission reliability of the through link.

Description

Straight-through link transmission method and terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a direct link transmission method and a terminal.

Background

In addition to the original broadcast communication mode, a unicast communication mode and a multicast communication mode are newly introduced in the New Radio (NR) vehicle networking (V2X) technology. Since no feedback is required for the broadcast communication mode, no feedback is supported in the current NR V2X technology, and thus the transmission reliability of the direct link (Sidelink) is poor due to the lack of feedback.

Disclosure of Invention

The embodiment of the invention provides a direct link transmission method and a terminal, aiming at the problem that the transmission reliability of a direct link is poor.

The embodiment of the invention provides a direct link transmission method, which comprises the following steps:

the first terminal determines that the first information is transmitted for N times according to a feedback result, wherein the feedback result is a feedback result fed back by the second terminal aiming at the information sent by the first terminal to the second terminal in the direct link, and N is a positive integer greater than or equal to 1;

and the first terminal transmits the first information to the second terminal for N times on the direct link.

Optionally, the feedback result includes at least one of:

a feedback result for the first information;

a feedback result for other information sent by the first terminal to the second terminal in the direct link;

and aiming at the feedback result of the first information and other information sent by the first terminal to the second terminal in the direct link.

Optionally, the determining, by the first terminal according to the feedback result, that the first information is transmitted for N times includes:

if the first terminal receives the NACK for M times, determining that the first information is transmitted for N times; or

If the sum of the NACK receiving times and the feedback information non-receiving times of the first terminal reaches M, determining that the first information is transmitted for N times; or

If the number of times that the first terminal does not receive the feedback information reaches M times, determining that the first information is transmitted for N times;

wherein, N is a positive integer greater than 1, and M is a positive integer greater than or equal to 1.

Optionally, at least one of M and N is configured by a protocol agreement, a pre-configuration, or a network device.

Optionally, the method further includes:

under the condition that the first terminal receives NACK (negative acknowledgement) fed back by the second terminal aiming at the first information or does not receive feedback information, if the sum of the NACK times and the times of not receiving the feedback information does not reach M, and the times of not receiving the NACK times or the times of not receiving the feedback information does not reach M, transmitting the first information to the second terminal for 1 time on the direct link;

the first terminal transmitting the first information to the second terminal N times on the direct link, including:

and under the condition that the first terminal receives NACK (negative acknowledgement) fed back by the second terminal aiming at the first information or does not receive feedback information, if the sum of the NACK times and the times of not receiving the feedback information reaches M, and the times of receiving the NACK times or not receiving the feedback information reaches M, the first terminal transmits the first information to the second terminal for N times on the direct link.

Optionally, the value of N is a protocol agreement, a network device is configured to the second terminal or the second terminal for pre-configuration, and a resource position occupied by the first information transmission N times is indicated to the second terminal by the first terminal or the network device; or

And the value of the N and/or the resource position occupied by the first information transmission for N times is indicated to the second terminal by the first terminal or the network equipment.

Optionally, at least one of the value of N and the resource location is indicated to the second terminal when it is determined that the first information is transmitted for N times; or

At least one of the value of N and the resource location is indicated to the second terminal prior to transmission of the first information.

Optionally, the first terminal indicates through direct link control information SCI or direct link RRC signaling; or

The network device indicates through a broadcast message or RRC signaling.

Optionally, the RV numbers of the redundancy versions of the first information transmitted each time in the N times of transmission of the first information are the same or different; or

And the RV number for transmitting the first information every time in the N times of transmission of the first information is protocol agreement or network equipment configuration or preconfiguration.

Optionally, during the transmission of the first information, the value of N is unchanged; or

And in the transmission process of the first information, the value of N is variable.

Optionally, when the value of N is variable:

in the transmission process of the first information, if the first information needs to be retransmitted to the second terminal for multiple times, the value of N is also increased along with the increase of the retransmission times, wherein each retransmission of the first information means that the first information is transmitted for N times.

Optionally, in the transmission process of the first information, the value range of N is a value in an N value set, and after the value of N is increased to the maximum value of the N value set, the value of N is maintained unchanged.

Optionally, the determining that the first information is transmitted for N times includes:

if the link information of the straight-through link meets a preset condition, determining that the first information is transmitted for N times;

wherein, N is a positive integer greater than 1, and the link information includes link status and/or link traffic information.

Optionally, when the sum of the number of times that the first terminal receives NACK and the number of times that the first terminal does not receive feedback information reaches M, and the number of times that the first terminal receives NACK M times or the number of times that the first terminal does not receive feedback information reaches M times, if the link information of the direct link does not satisfy the preset condition, it is determined that the first information is transmitted for 1 time.

Optionally, when the second terminal is a terminal, the condition that the link information of the direct link meets the preset condition refers to at least one of the following conditions:

the channel state of the direct link is lower than the channel state threshold;

the congestion degree of a direct link channel is lower than a channel congestion threshold;

the service quality QoS of the straight-through link is higher than the service QoS threshold;

or,

when the second terminal is a plurality of terminals, the condition that the link information of the through link satisfies the preset condition means at least one of the following:

the ratio of the channel state of the direct link lower than the channel state threshold is higher than a first ratio threshold;

the proportion that the congestion degree of the direct link channel is lower than the congestion threshold of the channel is higher than a second proportion threshold;

the through link traffic QoS is above the traffic QoS threshold.

Optionally, the QoS includes at least one of:

reliability, latency, priority, and communication range.

Optionally, when the second terminal is a terminal, the condition that the link information of the direct link meets the preset condition is that:

the QoS of the straight-through link is higher than the QoS threshold; or

Under the condition that the service QoS of the straight-through link is not higher than the service QoS threshold, the congestion degree of a straight-through link channel is lower than the channel congestion threshold;

or,

when the second terminal is a plurality of terminals, the condition that the link information of the through link meets the preset condition is that:

the QoS of the straight-through link is higher than the QoS threshold; or

And under the condition that the service QoS of the through link is not higher than the service QoS threshold, the proportion that the congestion degree of the through link channel is lower than the channel congestion threshold is higher than a second proportion threshold.

Optionally, the second terminal is a plurality of terminals, and the first terminal determines, according to the feedback result, that the first information is transmitted for N times, including:

and if the proportions of the M times of feedback results are higher than a third proportion threshold, determining that the first information is transmitted for N times, wherein the proportion refers to the proportion of dividing the number of received NACKs by the number of terminals of the second terminal, or the proportion refers to the proportion of dividing the number of the received NACKs and the number of the non-received feedback information by the number of the second terminals, or the proportion refers to the proportion of dividing the number of the non-received feedback information by the number of the second terminals, and M is a positive integer greater than or equal to 1.

Optionally, the second terminal feeds back NACK or ACK only once for the first information transmitted N times.

Optionally, the first terminal indicates, to the second terminal, an RV version number of the currently transmitted information through a direct link SCI or a direct link RRC signaling.

An embodiment of the present invention further provides a terminal, where the terminal is a first terminal, and the terminal includes:

the determining module is configured to determine, according to a feedback result, that the first information is transmitted for N times, where the feedback result is a feedback result of a second terminal feeding back information that is sent to the second terminal by the first terminal in a direct link, and N is a positive integer greater than or equal to 1;

a first transmission module, configured to transmit the first information to the second terminal N times on the direct link.

Optionally, the feedback result includes at least one of:

a feedback result for the first information;

Optionally, the determining module is configured to determine that the first information is transmitted for N times if the first terminal receives M times of NACK; or

The determining module is used for determining that the first information is transmitted for N times if the sum of the times that the first terminal receives the NACK and the times that the first terminal does not receive the feedback information reaches M; or

The determining module is used for determining that the first information is transmitted for N times if the number of times that the first terminal does not receive the feedback information reaches M times;

Optionally, the terminal further includes:

a second transmission module, configured to transmit, to the second terminal, the first information 1 time on the direct link if a sum of NACK times and times of not receiving feedback information does not reach M, and M times of not receiving NACK times or times of not receiving feedback information does not reach M times, when the first terminal receives NACK fed back by the second terminal for the first information or does not receive feedback information;

the first transmission module is configured to transmit the first information to the second terminal N times on the direct link if the sum of the NACK number and the number of times that the feedback information is not received reaches M, and the number of times that the NACK number is received M times or the number of times that the feedback information is not received reaches M times, when the first terminal receives NACK directed to the first information feedback by the second terminal or does not receive the feedback information.

Optionally, the determining module is configured to determine that the first information is transmitted N times if the link information of the direct link meets a preset condition when a sum of the number of times that the first terminal receives NACK and the number of times that the first terminal does not receive feedback information reaches M, and the first terminal receives NACK M times or the number of times that the first terminal does not receive feedback information reaches M times;

An embodiment of the present invention further provides a terminal, where the terminal is a first terminal, and the terminal includes: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor,

the processor is configured to determine that the first information is transmitted for N times according to a feedback result, where the feedback result is a feedback result of the second terminal feeding back information sent by the first terminal to the second terminal in the direct link, and N is a positive integer greater than or equal to 1;

the transceiver is configured to transmit the first information to the second terminal N times over the direct link;

or,

the transceiver is configured to determine that the first information is transmitted for N times according to a feedback result, where the feedback result is a feedback result of the second terminal feeding back information that is sent to the second terminal by the first terminal in the direct link, and N is a positive integer greater than or equal to 1;

the transceiver is further configured to transmit the first information to the second terminal N times over the direct link.

Optionally, the feedback result includes at least one of:

a feedback result for the first information;

and a feedback result for the first information and other information sent by the first terminal to the second terminal on the direct link.

Optionally, the transceiver is further configured to: under the condition that the first terminal receives NACK (negative acknowledgement) fed back by the second terminal aiming at the first information or does not receive feedback information, if the sum of the NACK times and the times of not receiving the feedback information does not reach M, and the times of not receiving the NACK times or the times of not receiving the feedback information does not reach M, transmitting the first information to the second terminal for 1 time on the direct link;

the transmitting the first information to the second terminal N times on the direct link includes:

and under the condition that the first terminal receives NACK fed back by the second terminal aiming at the first information or does not receive feedback information, if the sum of the NACK times and the times of not receiving the feedback information reaches M, and the times of receiving the NACK times or not receiving the feedback information reaches M, transmitting the first information to the second terminal for N times on the through link.

Optionally, when the sum of the number of times that the first terminal receives NACK and the number of times that the first terminal does not receive feedback information reaches M, and the number of times that the first terminal receives NACK M times or the number of times that the first terminal does not receive feedback information reaches M times, if the link state of the direct link does not satisfy the preset condition, it is determined that the first information is transmitted for 1 time.

The embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps in the direct link transmission method provided in the embodiment of the present invention.

In the embodiment of the invention, a first terminal determines that first information is transmitted for N times according to a feedback result, wherein the feedback result is a feedback result fed back by a second terminal aiming at information sent by the first terminal to the second terminal in a direct link, and N is a positive integer greater than or equal to 1; and the first terminal transmits the first information to the second terminal for N times on the direct link. Therefore, feedback can be carried out on the through link, and the first information is determined to carry out N times of transmission according to the feedback result, so that the transmission reliability of the through link is improved.

Drawings

FIG. 1 is a schematic diagram of a network architecture to which embodiments of the present invention are applicable;

fig. 2 is a flowchart of a direct link transmission method according to an embodiment of the present invention;

fig. 3 is a schematic diagram of another through link transmission method according to an embodiment of the present invention;

fig. 4 is a schematic diagram of another through link transmission method according to an embodiment of the present invention;

fig. 5 is a structural diagram of a terminal according to an embodiment of the present invention;

fig. 6 is a block diagram of another terminal provided in an embodiment of the present invention;

fig. 7 is a block diagram of another terminal according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, fig. 1 is a schematic diagram of a network structure to which the embodiment of the present invention is applicable, and as shown in fig. 1, the network structure includes a plurality of terminals 11 and a network device 12, where the terminal 11 may be a User Equipment (UE) or other terminal devices, for example: the present invention relates to a Mobile terminal, and more particularly, to a Mobile terminal, and a Mobile terminal. The direct link through which the terminals 11 can directly communicate is called a Sidelink (which translates to a direct communication link or bypass, also called a direct communication interface or a direct link interface), that is, the terminals can directly communicate with each other through the Sidelink. The terminals of the direct communication can be all on-line or all off-line, or part of the devices are on-line and part of the devices are off-line. Network device 12 may be a base station, for example: macro station, LTE eNB, 5G NR NB, etc.; the network device may also be a small station, such as a Low Power Node (LPN), pico, femto, or the network device may be an Access Point (AP); the base station may also be a Network node formed by a Central Unit (CU) and a plurality of Transmission Reception Points (TRPs) managed and controlled by the CU, and a cellular communication link between the Network Device and the terminal-side Device in direct communication is referred to as a Device to Network (D2N) link, or Uu interface. It should be noted that the specific type of the network device is not limited in the embodiment of the present invention.

It should be noted that, the embodiment of the present invention may be applied to an NR V2X network, and may also be applied to other networks that use a direct link for communication, and the embodiment of the present invention is not limited to this.

Referring to fig. 2, fig. 2 is a flowchart of a direct link transmission method according to an embodiment of the present invention, and as shown in fig. 2, the method includes the following steps:

201. the first terminal determines that the first information is transmitted for N times according to a feedback result, wherein the feedback result is a feedback result fed back by the second terminal aiming at the information sent by the first terminal to the second terminal in the direct link, and N is a positive integer greater than or equal to 1;

202. and the first terminal transmits the first information to the second terminal for N times on the direct link.

The feedback result may represent a feedback condition of the direct link, and may specifically be a feedback result of the first information, a feedback result of other information, or a feedback result of the first information and other information. For example: the feedback result may include at least one of:

a feedback result for the first information;

The other information may be information other than the first information transmitted from the first terminal to the second terminal.

Further, the feedback result may include at least one of a Negative-acknowledgement (NACK) and an Acknowledgement (ACK), and may also be a feedback result that no feedback information is received, that is, the feedback result is Discontinuous Transmission (DTX).

The determining that the first information is transmitted for N times according to the feedback result may be that, when the feedback result indicates that the packet loss ratio of the direct link is higher, or multiple NACKs are received, or multiple NACKs are not received, or the ratio of received ACK to NACK is lower, the first information is determined to be transmitted for multiple times, that is, N takes an integer greater than 1, otherwise, the first information is determined to be transmitted for 1 time, that is, N takes a value of 1.

It should be noted that the value of N may be configured in advance, for example: the value of N may be determined according to the feedback result. In addition, the value of N may be a value or a value set.

In addition, the above-mentioned determining that the first information is transmitted N times may be determining that the first information is transmitted N times in one transmission process, that is, when N is an integer greater than 1, N repeated transmissions are performed. For example: the first information is transmitted N times in one retransmission.

The determining, by the first terminal, that the first information is transmitted N times according to the feedback result may also be understood as determining, according to the feedback result, a number N of times that the first information is transmitted on the direct link.

The aforementioned transmitting, by the first terminal, the first information to the second terminal N times on the direct link may be transmitting the first information N times in one transmission process, for example: the first information is transmitted N times consecutively in one retransmission.

In the embodiment of the present invention, the first terminal sends the first information to the second terminal, and may receive a feedback result of the first information sent by the second terminal, and when the feedback result of the first information is NACK or the feedback information is not received, the first terminal retransmits the first information to the second terminal, and if the retransmission occurs after step 201, the retransmission is to transmit the first information N times.

It should be noted that the second terminal may be one or more terminals, that is, the embodiment of the present invention may be applied to unicast and multicast scenarios. For example: for a multicast scenario, the second terminal may be a plurality of receiving terminals in the group, and for a unicast scenario, the second terminal is one receiving terminal.

In the embodiment of the present invention, through the above steps, the first terminal may determine, according to a feedback condition of information transmitted on the through link, a number N of times that the first terminal transmits the first information on the through link, so that the transmission reliability of the through link may be improved.

As an optional implementation manner, the determining, by the first terminal according to the feedback result, that the first information is transmitted N times includes:

The received M NACK feedbacks may be M NACK feedbacks received continuously, or M NACK feedbacks received discontinuously, and the M NACK feedbacks may be feedbacks for different transmission information.

The non-reception of the feedback information may be continuous non-reception of the feedback information or non-continuous non-reception of the feedback information, and the non-reception of the feedback information may be feedback for different transmission information.

In this embodiment, since NACK feedback is received M times, or if the sum of the number of times that the first terminal receives NACK and the number of times that the first terminal does not receive feedback information reaches M times, or the number of times that the first terminal does not receive feedback information reaches M times, it can be indicated that the state of the direct link between the first terminal and the second terminal is poor, and thus it is determined that the first information is transmitted N times, so as to improve the transmission reliability of the direct link.

Wherein at least one of the above M and the N may be agreed by a protocol (may also be referred to as standard specification), preconfigured or configured by a network device. The network device configuration may be configured through a System Information Block (SIB), Radio Resource Control (RRC) dedicated signaling, or Downlink Control Information (DCI), and the pre-configuration may be pre-configured by the network device or the first terminal.

Optionally, the method further includes:

When the first terminal receives NACK fed back by the second terminal for the first information or does not receive feedback information, the first terminal may receive NACK fed back by the second terminal for the first information or does not receive feedback information of the second terminal for the first information.

It should be noted that, if the first terminal receives NACK fed back by the second terminal for the first information or does not receive feedback information, the first terminal transmits the first information to the second terminal N times on the direct link, where the first information is received M times, or if the sum of the number of times the first terminal receives NACK and the number of times the first terminal does not receive feedback information reaches M times, or the number of times the first terminal does not receive feedback information reaches M times, it is determined that the first information is transmitted N times, and the first terminal transmits the first information to the second terminal N times on the direct link when receiving the NACK fed back for the first information or not receiving the feedback information for the first information. That is, the M NACKs may include receiving the NACK for the first information feedback, or receiving the NACK for the first information feedback M times before receiving the NACK. The M times of non-reception of the feedback information may include that the feedback information is not received for the first information, or that the feedback information is not received for M times before the feedback information is not received for the first information, or that the sum of the number of times of receiving the NACK and the number of times of not receiving the feedback information by the first terminal reaches M.

In this embodiment, when receiving the NACK or not receiving the feedback information, if the sum of the NACK number and the number of times of not receiving the feedback information does not reach M, or the number of times of not receiving the NACK number or the number of times of not receiving the feedback information does not reach M, then only 1 time of the first information is transmitted during retransmission. And if the NACK is received or the feedback information is not received, the M-th NACK feedback is received, if the sum of the NACK receiving times and the feedback information not received times of the first terminal reaches M, or if the first information is retransmitted after the first information is not received times of the first terminal reaches M, the first information is continuously transmitted for N times, so that the transmission reliability of the direct link is improved.

That is to say, in the embodiment of the present invention, the first information may be determined to be transmitted N times according to the link information.

For example: if the first terminal receives M times of NACK, or if the sum of the times of receiving NACK and the times of not receiving the feedback information by the first terminal reaches M, the times of not receiving the feedback information by the first terminal reaches M times, and the link information of the straight-through link meets the preset condition, determining that the first information is transmitted for N times.

The preset condition may be protocol agreement, pre-configuration or network device configuration.

In this embodiment, it may be realized that the first information is determined to be transmitted N times only when the link information of the through link satisfies the preset condition, so as to improve the transmission performance of the through link.

Further, under the condition that the sum of the number of times that the first terminal receives NACK and the number of times that the first terminal does not receive feedback information reaches M, the first terminal receives NACK M times, or the number of times that the first terminal does not receive feedback information reaches M times, if the link information of the direct link does not satisfy the preset condition, it is determined that the first information is transmitted for 1 time.

Therefore, the N times of transmission can be avoided under the condition that the preset condition is not met, so that communication congestion or unnecessary transmission is avoided, and the transmission performance of the direct link is improved.

the channel state of the direct link is lower than the channel state threshold;

the Quality of Service (QoS) of the through link is higher than the QoS threshold.

It should be noted that, the above-mentioned satisfaction of the preset condition means that at least one of the above-mentioned three items is understood as that, in one case, the preset condition is considered to be satisfied if any one of the above-mentioned three items is satisfied, and in another case, the preset condition is considered to be satisfied if at least two of the above-mentioned three items are satisfied.

For example: when the second terminal is a terminal, the condition that the link information of the direct link meets the preset condition may be:

the QoS of the straight-through link is higher than the QoS threshold; or

And under the condition that the service QoS of the through link is not higher than the service QoS threshold, the congestion degree of the through link channel is lower than the channel congestion threshold.

That is, under the condition that the QoS is higher than the service QoS threshold, the congestion degree of the through link channel is not considered, but under the condition that the service QoS of the through link is not higher than the service QoS threshold, if the congestion degree of the through link channel is lower than the channel congestion threshold, the preset condition is met, so that N times of transmission is determined.

In addition, in one case, the condition that the preset condition is not met may be that the channel state of the direct link is not lower than a channel state threshold, or the congestion degree of the channel of the direct link is not lower than a channel congestion threshold, or the quality of service QoS of the direct link is not higher than a service QoS threshold. In another case, the condition that the preset condition is not satisfied may be that the channel state of the direct link is not lower than a channel state threshold, or the congestion degree of the channel of the direct link is not lower than a channel congestion threshold and the service QoS is not higher than a service QoS threshold. Or in another case, the condition that the preset condition is not met may mean that at least two items of the direct link channel state is not lower than the channel state threshold, the congestion degree of the direct link channel is not lower than the channel congestion threshold, and the service QoS is not higher than the service QoS threshold are met.

It should be noted that the three items above do not limit the need to exist simultaneously, for example, only the through link channel status, the through link channel congestion level, or the through link traffic QoS is considered in some schemes.

The Channel State of the direct link may be a Channel State such as Channel State Information (CSI), Rank Indication (RI), Channel Quality Indication (CQI), Signal to Interference plus Noise Ratio (SINR), or Reference Signal Receiving Power (RSRP).

The channel state threshold may be a CSI threshold, an RI threshold, a CQI threshold, an SINR threshold, or an RSRP threshold.

In this embodiment, the determination according to the channel state threshold of the direct link may be implemented, for example: if the channel state of the direct link is higher than the corresponding threshold, the channel state is better, and when the first terminal receives the Mth NACK feedback and retransmits the first information each time, only 1 time of retransmitting the first information is performed, so that the transmission overhead is reduced; if the channel state of the direct link is lower than the corresponding threshold, which indicates that the channel state is poor, the first information is transmitted for N times when the first information is retransmitted each time after the first terminal receives the Mth NACK feedback, so that the transmission reliability is improved.

The degree of the Channel congestion of the direct link may be a Channel Busy Ratio (CBR) threshold or a Channel occupancy Ratio (CR), and the like, and the Channel congestion threshold may be a CBR threshold or a CR threshold.

In this embodiment, the determination according to the congestion threshold of the direct link channel may be implemented, for example: if the congestion degree of the direct link channel is higher than the corresponding threshold, which indicates that the channel is congested, after the first terminal receives the Mth NACK feedback, only retransmitting the first information for 1 time when retransmitting the first information each time; because the channel is congested and the available resources are not much, more occupied sending resources are avoided, and errors caused by the condition that the sending resources are possibly not selected are avoided; another example is: if the congestion degree of the direct link channel is lower than the corresponding threshold, the channel is indicated to be not congested, that is, the channel resources are relatively abundant, and when the first terminal retransmits the first information each time after receiving the mth NACK feedback, the first information is transmitted for N times, so that the receiving success rate is improved.

Wherein the QoS may include at least one of:

reliability, latency, priority, and communication range.

The service QoS threshold may be at least one of a reliability threshold, a delay threshold, a priority threshold, and a communication range threshold.

In this embodiment, the QoS threshold determination according to the direct link service may be implemented, for example: if the direct link service QoS, if the reliability is higher than the reliability threshold, indicates that the reliability of the service requirement is higher, or the time delay is higher than the time delay threshold, indicates that the time delay of the service requirement is higher, or the priority is higher than the priority threshold, indicates that the priority of the service requirement is higher, or the communication range is higher than the communication range threshold, indicates that the required communication range is farther, and needs to be transmitted for multiple times to reach the transmission distance, when the first terminal receives the Mth NACK feedback, the first information is transmitted for N times when retransmitting the first information every time, so as to improve the receiving success rate and reduce the transmission time delay; another example is: if the QoS of the direct link service, for example, the reliability is lower than the reliability threshold, which indicates that the reliability of the service requirement is not high, or the delay is lower than the delay threshold, which indicates that the delay of the service requirement is low, or the priority is lower than the priority threshold, which indicates that the priority of the service requirement is low, or the communication range is lower than the communication range threshold, which indicates that the required communication range is relatively close, after the first terminal receives the M-th NACK feedback, only 1-time retransmission of the first information is performed each time, so as to reduce the transmission overhead.

Optionally, when the second terminal is a plurality of terminals, the condition that the link information of the direct link meets the preset condition refers to at least one of the following conditions:

the through link traffic QoS is above the traffic QoS threshold.

The channel state of the direct link, the congestion degree of the direct link channel, the QoS of the direct link service, and the corresponding threshold may refer to the related description of the foregoing embodiments, which is not described herein again.

The ratio of the direct link channel state lower than the channel state threshold is higher than the first ratio threshold, where the ratio of the direct link channel state lower than the channel state threshold among the plurality of terminals in the plurality of terminals is higher than the first ratio threshold, and the ratio of the direct link channel congestion degree lower than the channel congestion threshold is higher than the second ratio threshold, where the ratio of the direct link channel congestion degree lower than the channel congestion threshold among the plurality of terminals in the plurality of terminals is higher than the second ratio threshold.

For example: when the second terminal is a plurality of terminals, the condition that the link information of the direct link satisfies the preset condition may be that:

the QoS of the straight-through link is higher than the QoS threshold; or

That is, under the condition that the QoS is higher than the service QoS threshold, the congestion degree of the through link channel is not considered, but under the condition that the service QoS of the through link is not higher than the service QoS threshold, if the proportion that the congestion degree of the through link channel is lower than the channel congestion threshold meets the preset condition, N times of transmission is determined.

In addition, in an embodiment, the condition that the predetermined condition is not satisfied may be that a ratio of the channel state of the direct link being lower than the channel state threshold is not higher than a first ratio threshold, or a ratio of the congestion degree of the channel of the direct link being lower than the channel congestion threshold is not higher than a second ratio threshold, or a quality of service QoS of the direct link being not higher than a service QoS threshold. In another case, the condition that the predetermined condition is not satisfied may be that a ratio of the channel state of the direct link being lower than the channel state threshold is not higher than a first ratio threshold, or a ratio of the congestion degree of the direct link being lower than the channel congestion threshold is not higher than a second ratio threshold and the service QoS is not higher than the service QoS threshold. Or in another case, the unsatisfied preset condition may be that at least two of the ratio of the channel state of the direct link lower than the channel state threshold is not higher than the first ratio threshold, the ratio of the congestion degree of the direct link channel lower than the channel congestion threshold is not higher than the second ratio threshold, and the traffic QoS is not higher than the traffic QoS threshold are satisfied.

In this embodiment, when the ratio that the direct link channel state is lower than the channel state threshold (i.e., the direct link channel state between the terminals is lower than the number of the channel state thresholds/the number of terminals of a plurality of terminals) is higher than the first ratio threshold, when the first terminal retransmits the first information each time after receiving the mth NACK feedback, the first information may be transmitted N times; on the contrary, when the first terminal retransmits the first information each time after receiving the mth NACK feedback, only 1 time of retransmitting the first information.

And may also implement that, when the proportion of the through link channel congestion degree lower than the channel congestion threshold (i.e. the through link channel congestion degree between terminals is lower than the number of channel congestion thresholds/the number of terminals of multiple terminals) is higher than the second proportion threshold, when the first terminal retransmits the first information each time after receiving the mth NACK feedback, the first information is transmitted N times; on the contrary, when the first terminal retransmits the first information each time after receiving the mth NACK feedback, only 1 time of retransmitting the first information.

It should be noted that at least one of the channel state threshold, the channel congestion threshold, the traffic QoS threshold, the first proportional threshold and the second proportional threshold may be agreed by a protocol, preconfigured, or configured by a network device.

As an optional implementation manner, the value of N is a protocol agreement, a network device is configured to the second terminal or the second terminal for pre-configuration, and a resource location occupied by the first information transmission N times is indicated to the second terminal by the first terminal or the network device; or

The first terminal may indicate through direct link signaling, for example: the indication may be performed by Sidelink Control Information (SCI) or sidelink rrc (sidelink rrc) signaling, or may be performed by direct communication interface PC5 signaling (PC5 signaling) to indicate at least one of a value of N and a resource location to the second terminal.

The network device may indicate through a broadcast message, RRC signaling, or DCI, so as to indicate at least one of a value of N and a resource location to the second terminal.

Further, at least one of the value of N and the resource location may be indicated to the second terminal when it is determined that the first information is transmitted N times; or

At least one of a value of the N and the resource location may be indicated to the second terminal prior to transmission of the first information.

The indicating to the second terminal when it is determined that the first information is transmitted N times may be that the first terminal or the network device indicates at least one of the value of N and the resource location to the second terminal only when the first terminal or the network device starts to send the first information N times.

The indicating to the second terminal before the transmission of the first information may be that, when the value of the parameter M is known by the second terminal, at least one of the value of N and the resource location is indicated to the second terminal before the transmission of the first information. For example: that is, the value of M is agreed and preconfigured by a protocol, or M is configured to the second terminal through the first terminal or the network device. Thus, after the second terminal feeds back M NACKs, it can be determined that the first terminal will transmit the first information N times later.

In the foregoing embodiment, it may be implemented that the first terminal or the network device indicates, to the second terminal, the transmission number N of the first information and/or the resource location occupied by the N transmissions of the first information, and if N is a protocol agreement and the network device is configured to the second terminal or the second terminal is preconfigured, the first terminal or the network device does not need to indicate the transmission number N of the second terminal, and only needs to indicate the resource location occupied by the N transmissions of the first information. Therefore, the success rate of the second terminal for receiving the first information is improved, and unnecessary detection of the second terminal can be avoided, so that the power consumption is saved.

As an optional implementation manner, in the transmitting the first information N times, a Redundancy Version (RV) number of each time the first information is transmitted may be the same or different; or

The protocol agreement or the network device configuration or the pre-configuration may refer to:

the first information is transmitted each time by using the version number agreed by the protocol; or

Repeating the transmission for N times, and circularly using according to the sequence of the version numbers agreed by the protocol; or

The N times of repeated transmission all use the version number which should be used by the HARQ retransmission; or

And the N times of repeated transmission circularly use the version number from the version number which should be used by the HARQ retransmission according to the sequence agreed by the protocol.

As an optional implementation manner, the first terminal indicates, to the second terminal, an RV version number of the currently transmitted information through a direct link SCI or a direct link RRC signaling, so that a probability that the second terminal successfully receives the first information may be improved.

As an optional implementation manner, in the transmission process of the first information, the value of N is unchanged; or

In the above transmission process of the first information, the value of N may be unchanged, and the value of N in the retransmission process of the first information is unchanged, specifically, the number of times of each retransmission is the same in different retransmission times, for example: and transmitting the first information 3 times in the 1 st retransmission, and transmitting the first information 3 times in the 2 nd retransmission until the first information is successfully received.

In the transmission process of the first information, the variable value of N may be that the variable value of N is variable in the retransmission process of the first information, and specifically may be that in different retransmission times, there is retransmission with different retransmission times, for example: the first information is transmitted 1 time at the 1 st retransmission, the first information is transmitted 2 times at the 2 nd retransmission, the first information is transmitted 3 times at the 3 rd retransmission, and the like. The value of N is variable, so that the success rate of receiving the first information can be improved, and the transmission overhead can be saved.

Optionally, when the value of N is variable:

Wherein, the value of the N is also increased by selecting a value larger than the last time in the value set of N, for example: the value set of N includes 1, 2 and 3, so that in the first retransmission, the first information is transmitted for 1 time, the first information is transmitted for 2 times in the second retransmission, and the first information is transmitted for 3 times in the third retransmission. Therefore, after receiving the M-th NACK feedback, the first terminal can change the times N of continuously transmitting the first information from small to large according to the values in the N value set when retransmitting the first information every time until the first information is correctly received.

The value set of N may be agreed by a protocol, preconfigured, or configured by a network device.

Further, in the transmission process of the first information, the value range of N is a value in a value set of N, and after the value of N is increased to the maximum value of the value set of N, the value of N is maintained unchanged. This may enable to maintain N as the maximum value of the set of N values to increase the probability that the first information is successfully received if the first information has not been correctly received when the number N of consecutive transmissions of the first information is the maximum value of the set of N values. For example: the value set of N includes 1, 2, and 3, such that in the first retransmission, 1 time of first information is transmitted, 2 times of first information is transmitted in the second retransmission, 3 times of first information is transmitted in the 3 rd retransmission, 3 times of first information is transmitted in the 4 th retransmission, and 3 times of first information is transmitted in the 5 th retransmission, until the first information is successfully received.

As an optional implementation manner, the aforementioned second terminals are multiple terminals, and the determining, by the first terminal according to the feedback result, that the first information is transmitted N times includes:

The M times of feedback may be M times of feedback processes or feedback timings, where any one time of feedback may include NACKs fed back by all terminals that feed back NACKs among the multiple terminals in the current feedback or feedback results of all terminals that do not feed back among the multiple terminals in the current feedback. In addition, the M feedbacks may be continuous or discontinuous M feedbacks.

For example: the second terminals include 5 terminals, the third ratio threshold is 3/5, and the M is 3, so that if there are 4 NACKs in the 1 st feedback, 5 NACKs in the 2 nd feedback, and 4 NACKs in the 3 rd feedback, it is determined that the first information is transmitted N times.

Another example is: the second terminals include 5 terminals, the third ratio threshold is 3/5, and the M is 3, so that if there are 4 NACKs in the 1 st feedback, 2 NACKs and 3 non-received feedback information in the 2 nd feedback, and 4 NACKs in the 3 rd feedback, it is determined that the first information is transmitted N times.

For example: the second terminals include 5 terminals, the third ratio threshold is 3/5, and the M is 3, so that if 4 of the 1 st feedback have no feedback information received, 5 of the 2 nd feedback have no feedback information received, and 4 of the 3 rd feedback have no feedback information received, it is determined that the first information is transmitted N times.

Further, NACK and ACK may be fed back only when the reception is incorrect in the plurality of terminals, or NACK and ACK may be fed back when the reception is incorrect in the plurality of terminals, and ACK is fed back when the reception is correct and is not fed back when the reception is not correct, that is, DTX is obtained. For the two cases, the values of the third ratio threshold may be the same or different.

In addition, the third ratio threshold may be agreed by a protocol, pre-configured or configured by a network device.

In this embodiment, when the second terminal is a plurality of terminals, it may be determined that the first information is transmitted N times according to NACK fed back each time and a case where the feedback information is not received, so as to improve transmission reliability of the multicast scenario.

As an optional implementation manner, the second terminal feeds back NACK or ACK only once for the first information transmitted N times.

Therefore, the NACK or the ACK can be fed back only once in one transmission process, so that the transmission overhead is saved. For example: the first information is continuously transmitted for 3 times in a retransmission process, and the second terminal only needs to feed back NACK or ACK once for the 3 times of transmission of the first information to indicate that the reception fails or is successful.

The method provided by the embodiment of the present invention is illustrated by unicast and multicast respectively as follows:

example 1: unicast scenarios

The signaling flow diagram may be as shown in fig. 3:

the parameters M and N may be protocol-agreed, or the network device may be configured (e.g., SIB, RRC dedicated signaling) or pre-configured to the first terminal (N may be one value or one set).

The first terminal sends first information to the second terminal and receives a feedback result of the first information sent by the second terminal, and when the feedback result is NACK or the feedback information is not received, the first terminal retransmits the first information to the second terminal;

the first terminal retransmits the first information for 1 time before receiving the NACK feedback for M times, wherein the sum of the times of receiving the NACK and the times of not receiving the feedback information by the first terminal reaches M times, or the times of not receiving the feedback information by the first terminal reaches M times;

and when the first terminal receives the M-th NACK feedback, the sum of the times of receiving the NACK and the times of not receiving the feedback information by the first terminal reaches M, or the times of not receiving the feedback information by the first terminal reaches M, and retransmits the first information, the first information is continuously transmitted for N times.

Optionally, a judgment may be performed according to a preset condition of a terminal described in the embodiment shown in fig. 2 to judge whether a condition of continuously transmitting the first information N times is satisfied, if so, the first information is continuously transmitted N times, and if not, only the first information is transmitted 1 time (when the judgment condition is satisfied, when the first information is continuously transmitted N times).

In addition, the number of times N of continuously transmitting the first information is not changed every time the first information is retransmitted, or the number of times N of continuously transmitting the first information is changed every time the first information is retransmitted (in this case, N is configured as one set).

When the first terminal receives the M-th NACK feedback, the sum of the times that the first terminal receives the NACK and does not receive the feedback information reaches M, or the times that the first terminal does not receive the feedback information reaches M, and the first information is retransmitted each time, the times N for continuously transmitting the first information are changed from small to large according to the value in the N value set until the first information is correctly received;

when the first terminal transmits the first information which is transmitted for N times continuously, the second terminal only feeds back ACK or NACK once until the first information is successfully sent.

Optionally, the first terminal or the network device indicates or configures the second terminal, the transmission time N of the first information or the resource location occupied by the N transmissions of the first information (if N is agreed by a protocol, or the network device is configured or preconfigured to the second terminal, the first terminal or the network device does not need to indicate the transmission time N of the second terminal, but only needs to indicate the resource location occupied by the N transmissions of the first information).

It should be noted that the order of sending the information indicated or configured and other information is not limited, that is, the information is not necessarily sent according to the information flow order shown in fig. 3; for example, the information configured by the first terminal or the network device may be configured when the first terminal and the second terminal initially establish a connection, or the information indicated by the SCI information of the first terminal may be indicated by the SCI information when the first terminal transmits the first information to the second terminal N times.

Specifically, the first terminal may indicate, to the second terminal, the number N of transmissions of the first information or a resource location occupied by the N transmissions of the first information through Sidelink RRC signaling, SCI, or PC5-S signaling (PC5 signaling);

the network equipment can indicate the transmission times N of the first information or the resource position occupied by the transmission of the first information for N times to a second terminal through broadcasting RRC signaling, terminal-specific RRC signaling or DCI; the indication mode can be two modes as follows:

a first terminal or network equipment indicates the transmission times N of first information or resource positions occupied by the N transmissions of the first information to a second terminal when the first terminal or network equipment starts to send the first information for N times; or

Before transmitting the first information, the first terminal or the network device may indicate, to the second terminal, the number N of transmissions of the first information or a resource location occupied by the N transmissions of the first information. This approach may be applicable where the parameter M is known to the second terminal, i.e. the parameter M is specified by a standard, or is pre-configured, or is configured to the second terminal by the first terminal or the network device. Thus, after the second terminal feeds back M times of NACKs, or the sum of the NACK feedback times and the non-feedback times reaches M, or the non-feedback times reaches M, it can be determined that the first terminal will send the first information N times.

In addition, the first terminal continuously transmits the first information for N times, and the RV version number of each transmission in the N transmissions can be the same or different; or

The RV version number may be standard specified, or network device configured or preconfigured, for example:

a version number agreed upon using the protocol; or

Using the version number which should be used by the HARQ retransmission, wherein the version number is used by the N times of repeated transmission; or

The N times of repeated transmission are circularly used from the version number which should be used by the HARQ retransmission according to the sequence agreed by the protocol.

Example 2: multicast scenario

The specific signaling flow diagram may be as shown in fig. 4:

the parameters M, N may be standard defined, or the network device may be configured (via system broadcast message SIB, RRC dedicated signaling) or pre-configured to the first terminal (N may be a value or a set)

The first terminal sends the first information to the second terminal 1 and the second terminal 2, receives feedback results of the first information sent by the second terminal 1 and the second terminal 2, and retransmits the first information to the second terminal 1 and the second terminal 1 when at least one of the feedback results is NACK or the feedback information is not received.

Taking fig. 4 as an example, the second terminal 1 receives an error, and the second terminal 2 receives a correct message, but because the message is a multicast message, all terminals in the group can receive the message as long as one feedback message is NACK or the feedback message is not received.

In M times of feedback, the first terminal continuously transmits the first information for N times when the first information is retransmitted, wherein the ratio of the number of received NACKs to the number of terminals of the second terminal, or the ratio of the number of received NACKs to the number of non-received feedback information to the number of second terminals is higher than a third ratio threshold; taking fig. 4 as an example, when the number of received NACKs/the number of receiving terminals in the group is 1/2, for example, the third ratio threshold is 0.4, the first information is continuously transmitted N times when the first information is retransmitted.

Wherein, the first terminal retransmits the first information only once before receiving the M times of NACK feedback.

Alternatively, it may be determined according to preset conditions of the plurality of terminals described in the embodiment shown in fig. 2 to determine whether a condition for continuously transmitting the first information N times is satisfied, if so, the first information is continuously transmitted N times, and if not, the first information is transmitted only 1 time (when the determination condition is satisfied, when the first information is continuously transmitted N times).

In addition, the number N of times of continuously transmitting the first information is unchanged when the first information is retransmitted each time; alternatively, the number of times N that the first information is continuously transmitted may be variable each time the first information is retransmitted (in this case, N is configured as one set).

And when the first terminal receives the M-th NACK feedback, the sum of the times that the first terminal receives the NACK and does not receive the feedback information reaches M, or the times that the first terminal does not receive the feedback information reaches M, and the first information is retransmitted each time, the times N for continuously transmitting the first information are sequentially changed from small to large according to the values in the N value set until the first information is correctly received.

When the first terminal continuously transmits the first information N times, the second terminal 1 or the second terminal 1 only feeds back ACK or NACK once until the first information is successfully transmitted.

Optionally, the first terminal or the network device indicates the second terminal, the transmission time N of the first information or the resource location occupied by the N transmissions of the first information (if N is specified by a standard, or the network device is configured or preconfigured to the second terminal, the first terminal or the network device does not need to indicate the transmission time N of the second terminal, but only needs to indicate the resource location occupied by the N transmissions of the first information).

a first terminal or network equipment indicates a second terminal when starting to send first information for N times, wherein the transmission times of the first information are N or resource positions occupied by the N transmissions of the first information; or

The first terminal or the network device may indicate, before transmitting the first information, the second terminal, the number N of transmissions of the first information, or a resource location occupied by the N transmissions of the first information. This approach may be applicable where the parameter M is known to the second terminal, i.e. the parameter M is specified by a standard, or is pre-configured, or is configured to the second terminal by the first terminal or the network device. Thus, when the second terminal feeds back M times of NACKs, the sum of the NACK times fed back and the times of non-feedback information reaches M, or the times of non-feedback information reaches M times, it can be determined that the first terminal will send the first information N times later.

a version number agreed upon using the protocol; or

In the embodiment of the present invention, a first terminal may determine, according to a feedback situation of information transmission on a direct link, a number N of times that the first terminal transmits the first information on the direct link, where N is a positive integer greater than or equal to 1. And the first terminal or the network equipment indicates the second terminal, the transmission times N of the first information or the resource position occupied by the transmission times N of the first information.

The through link transmission method provided by the embodiment of the invention can improve the reliability of information transmission on the through link and reduce the service transmission delay.

Referring to fig. 5, fig. 5 is a structural diagram of a terminal according to an embodiment of the present invention, where the terminal is a first terminal, and as shown in fig. 5, a terminal 500 includes:

a determining module 501, configured to determine, according to a feedback result, that a first message is transmitted N times, where the feedback result is a feedback result of a second terminal feeding back information that is sent by the first terminal to the second terminal in a direct link, and N is a positive integer greater than or equal to 1;

a first transmitting module 502, configured to transmit the first information to the second terminal N times on the direct link.

Optionally, the feedback result includes at least one of:

a feedback result for the first information;

Optionally, the determining module 501 is configured to determine that the first information is transmitted for N times if the first terminal receives M times of NACKs; or

The determining module 501 is configured to determine that the first information is transmitted N times if the sum of the NACK receiving times and the feedback information non-receiving times of the first terminal reaches M; or

The determining module 501 is configured to determine that the first information is transmitted N times if the number of times that the first terminal does not receive the feedback information reaches M times;

Optionally, as shown in fig. 6, the terminal 500 further includes:

a second transmission module 503, configured to transmit, to the second terminal, the first information 1 time on the direct link if the sum of the NACK number and the number of times that the feedback information is not received does not reach M, the NACK number is not received M times, or the number of times that the feedback information is not received M times, when the first terminal receives NACK fed back by the second terminal for the first information or does not receive feedback information;

the first transmission module 501 is configured to transmit the first information to the second terminal N times on the direct link if the sum of the NACK number and the number of times that the feedback information is not received reaches M, and the number of times that the NACK number is received M times or the number of times that the feedback information is not received reaches M times, when the first terminal receives NACK fed back by the second terminal for the first information or does not receive feedback information.

The network equipment indicates through broadcast message, RRC signaling or downlink control information DCI.

Optionally, when the value of N is variable:

Optionally, the determining module 501 is configured to determine that the first information is transmitted N times if the link information of the direct link meets a preset condition when the sum of the number of times that the first terminal receives NACK and the number of times that the first terminal does not receive feedback information reaches M, and the number of times that the first terminal receives NACK M times or the number of times that the first terminal does not receive feedback information reaches M times;

the channel state of the direct link is lower than the channel state threshold;

or,

the through link traffic QoS is above the traffic QoS threshold.

Optionally, the QoS includes at least one of:

reliability, latency, priority, and communication range.

the QoS of the straight-through link is higher than the QoS threshold; or

or,

the QoS of the straight-through link is higher than the QoS threshold; or

Optionally, the second terminals are multiple terminals, and the determining module 501 is configured to determine that the first information is transmitted for N times if the ratios of the M feedback results are higher than a third ratio threshold, where the ratio is a ratio of the number of received NACKs divided by the number of terminals of the second terminal, or the ratio is a ratio of the number of received NACKs and the number of non-received feedback information divided by the number of second terminals, or the ratio is a ratio of the number of non-received feedback information divided by the number of second terminals, and M is a positive integer greater than or equal to 1.

The first terminal provided in the embodiment of the present invention can implement each process in the method embodiment shown in fig. 2, and can obtain the same beneficial effects, and is not described herein again to avoid repetition.

Referring to fig. 7, fig. 7 is a structural diagram of another first terminal according to an embodiment of the present invention, and as shown in fig. 7, the first terminal includes: a transceiver 710, a memory 720, a processor 700, and a program stored on the memory 720 and executable on the processor 700, wherein:

the processor 700 is configured to determine that the first information is transmitted for N times according to a feedback result, where the feedback result is a feedback result of the second terminal feeding back information that is sent by the first terminal to the second terminal in the direct link, and N is a positive integer greater than or equal to 1;

the transceiver 710 configured to transmit the first information to the second terminal N times over the direct link;

or,

the transceiver 710 is configured to determine that the first information is transmitted for N times according to a feedback result, where the feedback result is a feedback result of the second terminal feeding back information that is sent by the first terminal to the second terminal in the direct link, and N is a positive integer greater than or equal to 1;

the transceiver 710 is further configured to transmit the first information to the second terminal N times over the direct link.

Among other things, the transceiver 710 may be used to receive and transmit data under the control of the processor 700.

In FIG. 7, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 700 and memory represented by memory 720. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 710 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 700 in performing operations.

It should be noted that the memory 720 is not limited to be located on the first terminal, and the memory 720 and the processor 700 may be separated and located in different geographical locations.

Optionally, the feedback result includes at least one of:

a feedback result for the first information;

Optionally, the determining, according to the feedback result, the first information to perform N times of transmission includes:

Optionally, the transceiver 710 is further configured to transmit the first information to the second terminal 1 time on the direct link if the sum of the NACK number and the number of times that the feedback information is not received does not reach M, the NACK number is not received M times, or the number of times that the feedback information is not received M times, when the first terminal receives NACK fed back by the second terminal for the first information or does not receive feedback information;

Optionally, when the value of N is variable:

the channel state of the direct link is lower than the channel state threshold;

or,

the through link traffic QoS is above the traffic QoS threshold.

Optionally, the QoS includes at least one of:

reliability, latency, priority, and communication range.

the QoS of the straight-through link is higher than the QoS threshold; or

or,

the QoS of the straight-through link is higher than the QoS threshold; or

It should be noted that, in this embodiment, the first terminal may be a first terminal in any implementation manner in the method embodiment of the present invention, and any implementation manner of the first terminal in the method embodiment of the present invention may be implemented by the first terminal in this embodiment, so as to achieve the same beneficial effects, and details are not described here again.

The present invention also provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in the direct link transmission method provided by the embodiments of the present invention.

In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the transmission method of the direct link according to various embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A direct link transmission method, comprising:

the first terminal transmits the first information to the second terminal for N times on the direct link;

wherein the method further comprises:

2. The method of claim 1, wherein the feedback results comprise at least one of:

a feedback result for the first information;

3. The method of claim 1, wherein the determining, by the first terminal, the first information to transmit for N times according to the feedback result comprises:

4. The method of claim 3, wherein at least one of the M and the N is configured by protocol agreement, preconfiguration, or a network device.

5. The method of claim 1, wherein the value of N is a protocol agreement, a network device is configured to the second terminal or the second terminal is preconfigured, and a resource location occupied by the first information transmission N times is indicated to the second terminal by the first terminal or the network device; or

6. The method of claim 5, wherein at least one of the value of N and the resource location is indicated to the second terminal if it is determined that the first information is transmitted N times; or

7. The method of claim 5, wherein the first terminal indicates through direct link control information (SCI) or direct link RRC signaling; or

8. The method of claim 1, wherein the transmitting the first information N times has the same or different redundancy version, RV, number for each of the transmitting the first information; or

9. The method of claim 1, wherein a value of the N is unchanged during transmission of the first information; or

10. The method of claim 9, wherein, if the value of N is variable:

11. The method of claim 10, wherein during the transmission of the first information, the value range of N is a value in a set of N values, and the N value is maintained unchanged after the value of N is increased to a maximum value of the set of N values.

12. The method of claim 3, wherein determining that the first information is transmitted N times comprises:

13. The method of claim 12, wherein when a sum of the number of times that the first terminal receives the NACK and the number of times that the first terminal does not receive the feedback information reaches M, the first terminal receives the NACK M times, or the first terminal does not receive the feedback information reaches M times, if the link information of the direct link does not satisfy the preset condition, it is determined that the first information is transmitted 1 time.

14. The method according to claim 12, wherein, in a case that the second terminal is a terminal, the condition that the link information of the direct link satisfies the preset condition is at least one of:

the channel state of the direct link is lower than the channel state threshold;

or,

the through link traffic QoS is above the traffic QoS threshold.

15. The method of claim 14, wherein the QoS comprises at least one of:

reliability, latency, priority, and communication range.

16. The method according to claim 14, wherein, in case that the second terminal is a terminal, the condition that the link information of the direct link satisfies the predetermined condition is: the QoS of the straight-through link is higher than the QoS threshold; or

or,

the QoS of the straight-through link is higher than the QoS threshold; or

17. The method according to any of claims 1 to 16, wherein the second terminals are a plurality of terminals, and the determining, by the first terminal, that the first information is transmitted N times according to the feedback result comprises:

18. The method according to one of claims 1 to 16, characterized in that the second terminal feeds back a NACK or an ACK only once for said first information N times said transmission.

19. The method of any of claims 1 to 16, wherein the first terminal indicates to the second terminal the RV version number of the currently transmitted information through direct link SCI or direct link RRC signaling.

20. A terminal, the terminal being a first terminal, comprising:

a first transmission module, configured to transmit the first information to the second terminal N times over the direct link;

the terminal further comprises:

21. The terminal of claim 20, wherein the feedback results include at least one of:

a feedback result for the first information;

22. The terminal of claim 20, wherein the determining module is configured to determine that the first information is transmitted N times if the first terminal receives M NACKs; or

23. The terminal of claim 22, wherein the determining module is configured to determine that the first information is transmitted N times if the link information of the direct link meets a preset condition when a sum of a NACK reception time and a non-reception time of the feedback information by the first terminal reaches M times, the NACK reception time by the first terminal reaches M times, or the non-reception time of the feedback information by the first terminal reaches M times;

24. A terminal, the terminal being a first terminal, comprising: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor,

or,

the transceiver is further configured to transmit the first information to the second terminal N times over the direct link;

wherein the transceiver is further configured to: under the condition that the first terminal receives NACK (negative acknowledgement) fed back by the second terminal aiming at the first information or does not receive feedback information, if the sum of the NACK times and the times of not receiving the feedback information does not reach M, and the times of not receiving the NACK times or the times of not receiving the feedback information does not reach M, transmitting the first information to the second terminal for 1 time on the direct link;

25. The terminal of claim 24, wherein the feedback results include at least one of:

a feedback result for the first information;

26. The terminal of claim 24, wherein the first terminal determines that the first information is transmitted N times according to the feedback result, comprising:

27. The terminal of claim 24, wherein the value of N is a protocol agreement, a network device is configured to the second terminal or the second terminal is preconfigured, and a resource location occupied by the first information transmission N times is indicated to the second terminal by the first terminal or the network device; or

28. The terminal of claim 24, wherein the N transmissions of the first information have the same or different redundancy version, RV, number for each of the transmissions; or

29. The terminal of claim 24, wherein a value of the N is unchanged during transmission of the first information; or

30. The terminal of claim 26, wherein said determining that the first information is transmitted N times comprises:

31. The terminal of claim 30, wherein when a sum of a NACK reception frequency and a non-reception frequency of the first terminal reaches M, the first terminal receives M NACKs, or the first terminal does not receive feedback information reaches M, if the link information of the direct link does not satisfy the preset condition, it is determined that the first information is transmitted for 1 time.

32. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps in the direct link transmission method according to any one of claims 1 to 19.