CN116134764A

CN116134764A - Blind retransmission method, device, equipment and medium

Info

Publication number: CN116134764A
Application number: CN202080104066.9A
Authority: CN
Inventors: 顾昕钰; 赵振山; 丁伊
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-09-04
Filing date: 2020-09-04
Publication date: 2023-05-16
Also published as: WO2022047748A1

Abstract

The application discloses a blind retransmission method, a device, equipment and a storage medium, and relates to the field of D2D communication, wherein the blind retransmission method comprises the following steps: the first terminal sends a first data packet to the second terminal according to the first blind retransmission times; the first terminal receives feedback information, wherein the feedback information is used for representing information related to the transmission times required by the second terminal to successfully decode the first data packet; and the first terminal sends a second data packet to the second terminal according to the second blind retransmission times, wherein the second blind retransmission times are determined according to the feedback information.

Description

Blind retransmission method, device, equipment and medium

Technical Field

The present disclosure relates to the field of Device-to-Device (D2D) communication, and in particular, to a blind retransmission method, apparatus, device, and medium.

Background

D2D communication refers to direct communication of user equipments within a certain distance range, without the need for relay of a base station. The use of D2D communication in unlicensed spectrum has become a solution to improve the throughput of communication systems.

Since it is uncertain whether the receiving end can occupy the unlicensed spectrum in time, the timeliness of HARQ feedback cannot be guaranteed. The transmitting end will adopt a blind retransmission mechanism to transmit the data packet to the receiving end. The blind retransmission mechanism refers to: and repeatedly transmitting the same data packet to the receiving end by the transmitting end according to the blind retransmission times N under the condition of not depending on HARQ feedback of the receiving end. For example, the same data packet is continuously transmitted to the receiving end by the transmitting end 7 times.

How to accurately select the blind retransmission times by the transmitting end is a technical problem to be solved.

Disclosure of Invention

The embodiment of the application provides a blind retransmission method, a blind retransmission device, blind retransmission equipment and a storage medium. The technical scheme is as follows.

According to an aspect of the embodiments of the present application, there is provided a blind retransmission method applied to a first terminal, where the method includes:

sending a first data packet to a second terminal according to the first blind retransmission times;

receiving feedback information, wherein the feedback information is used for representing information related to the transmission times required by the second terminal to successfully decode the first data packet;

and sending a second data packet to the second terminal according to the second blind retransmission times, wherein the second blind retransmission times are determined according to the feedback information.

According to an aspect of the embodiments of the present application, there is provided a blind retransmission method applied to a second terminal, where the method includes:

receiving a first data packet, wherein the first data packet is sent by a first terminal according to first blind retransmission times;

sending feedback information to the first terminal, wherein the feedback information is used for representing information related to the transmission times required by the second terminal to successfully decode the first data packet;

And receiving a second data packet, wherein the second data packet is sent by the first terminal according to a second blind retransmission time, and the second blind retransmission time is determined according to the feedback information.

According to an aspect of the embodiments of the present application, there is provided a blind retransmission apparatus, including:

the sending module is used for sending a first data packet to the second terminal according to the first blind retransmission times;

the receiving module is used for feeding back information, and the feedback information is used for representing information related to the transmission times required by the second terminal to successfully decode the first data packet;

and the sending module is used for sending a second data packet to the second terminal according to the second blind retransmission times, wherein the second blind retransmission times are determined according to the feedback information.

the receiving module is used for receiving a first data packet, wherein the first data packet is sent by a first terminal according to first blind retransmission times;

a sending module, configured to send feedback information to the first terminal, where the feedback information is used to characterize information related to a number of transmissions required by the device to successfully decode the first data packet;

The receiving module is configured to receive a second data packet, where the second data packet is sent by the first terminal according to a second blind retransmission number, and the second blind retransmission number is determined according to the feedback information.

According to an aspect of embodiments of the present application, there is provided a terminal including: a processor; a transceiver coupled to the processor; a memory for storing executable instructions of the processor; wherein the processor is configured to load and execute the executable instructions to implement the blind retransmission method as described in the above aspect.

According to one aspect of the embodiments of the present application, there is provided a computer readable storage medium having stored therein executable instructions that are loaded and executed by the processor to implement the blind retransmission method as described in the above aspect.

According to an aspect of the embodiments of the present application, there is provided a computer program product, the readable storage medium having stored therein executable instructions that are loaded and executed by the processor to implement the blind retransmission method as described in the above aspect.

According to an aspect of the embodiments of the present application, there is provided a chip for executing to implement the blind retransmission method as described in the above aspect.

The technical scheme provided by the embodiment of the application at least comprises the following beneficial effects:

in the scene that the transmitting end uses the blind retransmission mechanism to transmit data, the receiving end transmits information related to the transmission times required by successfully decoding the first data packet to the transmitting end, and the transmitting end can dynamically change the blind retransmission times, so that the communication success rate is improved and the waste of transmission resources is avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an architecture diagram of a communication system provided in one exemplary embodiment of the present application;

fig. 2 is a flow chart of a blind retransmission method provided in an exemplary embodiment of the present application;

fig. 3 is a flow chart of a blind retransmission method provided in an exemplary embodiment of the present application;

fig. 4 is a flowchart of a blind retransmission method provided in an exemplary embodiment of the present application;

FIG. 5 is a schematic diagram of a unicast scenario provided by an exemplary embodiment of the present application;

fig. 6 is a schematic diagram of a multicast scenario provided in an exemplary embodiment of the present application;

fig. 7 is a block diagram of a blind retransmission apparatus provided in an exemplary embodiment of the present application;

fig. 8 is a block diagram of a blind retransmission apparatus provided in an exemplary embodiment of the present application;

fig. 9 is a schematic structural diagram of a communication device according to an exemplary embodiment of the present application.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

When D2D communication is used in unlicensed spectrum, a transmitting end adopts a blind retransmission mechanism to transmit a data packet to a receiving end. In the related art, a transmitting end adopts preset blind retransmission times to transmit a data packet to a receiving end. For example, the transmitting end repeatedly transmits 5 times for each data packet. Wherein the selection of the number of blind retransmissions is difficult. On the one hand, the probability of successful decoding of the receiving end is lower when the number of blind retransmission times selected by the transmitting end is too small; on the other hand, when the number of blind retransmissions selected by the transmitting end is too large, too many unnecessary channel resources are occupied.

The embodiment of the application provides a blind retransmission frequency selection mechanism based on feedback information. In a scenario that the transmitting end transmits data to the receiving end by adopting blind retransmission times, the receiving end transmits feedback information to the transmitting end, wherein the feedback information is used for representing information related to transmission times required by the receiving end to successfully decode a data packet in a historical receiving process. And after receiving the feedback information, the sending end readjusts the blind retransmission times of the sending end to obtain more reasonable blind retransmission times.

Fig. 1 shows a schematic architecture of a communication system according to an embodiment of the present application. The communication system may include: a terminal 10 and a network device 20.

The number of terminals 10 is typically plural and one or more terminals 10 may be distributed within a cell managed by each network device 20. The terminal 10 may include various handheld devices, vehicle mount devices, wearable devices, computing devices, or other processing devices connected to a wireless modem, as well as various forms of User Equipment (UE), mobile Station (MS), and the like, having wireless communication capabilities. For convenience of description, in the embodiment of the present application, the above-mentioned devices are collectively referred to as a terminal. In some cases, the plurality of terminals 10 communicate using D2D communication.

Network device 20 is a means deployed in an access network to provide wireless communication functionality for terminal 10. The network device 20 may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. The names of network device-capable devices may vary in systems using different radio access technologies, for example in 5G NR systems called gndeb or gNB. As communication technology evolves, the name "network device" may change. For convenience of description, in the embodiments of the present application, the above-mentioned devices for providing the wireless communication function for the terminal 10 are collectively referred to as a network device.

The "5G NR system" in the embodiments of the present disclosure may also be referred to as a 5G system or an NR system, which may be a communication system supporting NR-U, but the meaning thereof may be understood by those skilled in the art. The technical scheme described in the embodiment of the disclosure can be applied to a 5G NR system and also can be applied to a subsequent evolution system of the 5G NR system.

Fig. 2 shows a flowchart of a blind retransmission method according to an exemplary embodiment of the present application. The present embodiment is exemplified by the method applied to the communication system shown in fig. 1, and the first terminal is a transmitting terminal. The method comprises the following steps:

Step 202: sending a first data packet to a second terminal according to the first blind retransmission times;

step 204: receiving feedback information, wherein the feedback information is used for representing information related to the transmission times required by the second terminal to successfully decode the first data packet;

step 206: and sending a second data packet to a second terminal according to the second blind retransmission times, wherein the second blind retransmission times are determined according to the feedback information.

In summary, in the method provided in this embodiment, in a scenario where the transmitting end uses the blind retransmission mechanism to perform data transmission, the receiving end sends information related to the number of transmission times required for successfully decoding the first data packet to the transmitting end, so that the transmitting end can dynamically change the blind retransmission number, thereby improving the communication success rate and avoiding the waste of transmission resources.

Fig. 3 shows a flowchart of a blind retransmission method according to an exemplary embodiment of the present application. The present embodiment is exemplified by the method applied to the communication system shown in fig. 1, and the second terminal is a receiving terminal. The method comprises the following steps:

step 302: receiving a first data packet, wherein the first data packet is sent by a first terminal according to first blind retransmission times;

step 304: the method comprises the steps of sending feedback information to a first terminal, wherein the feedback information is used for representing information related to the transmission times required by a second terminal to successfully decode a first data packet;

Step 306: and receiving a second data packet, wherein the second data packet is sent by the first terminal according to the second blind retransmission times, and the second blind retransmission times are determined according to the feedback information.

In an alternative embodiment based on fig. 2 or fig. 3, a blind retransmission mechanism is used between the first terminal and the second terminal for transmitting data. The first terminal is a sender, a sender or a sending terminal, and the second terminal is a receiver, a receiver or a receiving terminal. The identity of the roles between the first terminal and the second terminal may be interchanged in different time and/or frequency domains, e.g. the first terminal is the transmitting end during a period of time and the second terminal is the transmitting end during another period of time.

The first blind retransmission times are preset blind retransmission times, or blind retransmission times determined according to a certain mode, or blind retransmission times adjusted in the last adjustment process according to the scheme of the embodiment of the application. The selection manner of the first blind retransmission times is not limited in this embodiment.

It should be noted that, in the present application, the actual number of transmissions of the first data packet is equal to the blind retransmission number, that is, the blind retransmission number includes the first transmission. In other embodiments, the actual number of transmissions of the first data packet is equal to the count of the number of blind retransmissions+1, i.e. the number of blind retransmissions does not include the first transmission, but only the number of retransmissions from the second transmission to the last transmission. When the actual transmission number is equal to the count of the blind retransmission number +1, the second blind retransmission number determined in the following embodiment is only reduced by one, which is a content easily understood by those skilled in the art and will not be described again.

The first data packet is one or more data packets transmitted with a first blind retransmission number. The present application illustrates the first data packet as a plurality.

The feedback information is generated by the second terminal, i.e. after receiving the first data packet by the second terminal. The feedback information is information about the number of transmissions recorded by the second terminal that are required to successfully decode the first data packet. Such as a distribution of the number of transmissions required to successfully decode the first data packet, a proportion of the number of transmissions required to successfully decode the first data packet, probability information of the number of transmissions required to successfully decode the first data packet, and the like.

The specific content of the feedback information is not limited in this embodiment, as long as the information related to the number of transmissions required by the second terminal to successfully decode the first data packet can be represented, which does not exclude that in some embodiments, the information of failed decoding of the first data packet is used for reverse expression.

And the first terminal determines reasonable second blind retransmission times according to the feedback information. In general, the second blind retransmission number is different from the first blind retransmission number, but the case that the second blind retransmission number is the same as the first blind retransmission number is not excluded.

The second data packet is one or more data packets transmitted with a second blind retransmission number.

The above adjustment process of the blind retransmission times may be repeatedly performed at predetermined time intervals, for example, the blind retransmission times may be adjusted every second.

Fig. 4 shows a flowchart of a blind retransmission method according to an exemplary embodiment of the present application. The embodiment is applied to at least two terminals shown in fig. 1 by the method, and D2D communication is adopted between the at least two terminals. The method comprises the following steps:

step 401: the first terminal sends a first data packet to the second terminal according to the first blind retransmission times;

and transmitting data between the first terminal and the second terminal by adopting a blind retransmission mechanism. Illustratively, the first terminal and the second terminal communicate using a D2D communication mode. The first terminal and the second terminal transmit data on the unlicensed spectrum using a blind retransmission mechanism.

The first data packet is one or more data packets transmitted with a first blind retransmission number. The present application illustrates the first data packet as a plurality. Correspondingly, the second terminal receives one or more first data packets.

Step 402: the second terminal receives a first data packet, wherein the first data packet is sent by the first terminal according to the first blind retransmission times;

step 403: the second terminal generates feedback information;

and the second terminal generates feedback information according to the transmission times required by successfully decoding the first data packet in the first time period. Illustratively, the first period of time is a period of time after the second terminal has transmitted the last feedback information when the second terminal has historically transmitted the last feedback information. Illustratively, the first time period is a time period determined according to a timer, which may be started after the last feedback information is sent, and the first time period is between the starting time and the ending time of the timer. However, in the embodiment of the present application, the determination manner of the first period is not limited.

Optionally, the feedback information includes at least one of:

the number of successful decoding of the first data packet per transmission number

Assuming that the first blind retransmission number is N, the number of successfully decoding the first data packet at each transmission number includes: the number of the first data packets is successfully decoded when the transmission time is 1; the number of the first data packets is successfully decoded when the transmission times are 2; the number of the first data packets is successfully decoded when the transmission time is 3; …; and successfully decoding the number of the first data packets when the transmission time is N.

For example, assuming Φ is the set of all first packets in the first time period, the number of packets successfully decoded in one transmission

I.e. the sum of the number of first data packets correctly decoded after a transmission. Similarly, assuming that the current first blind retransmission number is N, the number of data packets which can be correctly decoded after N (N is more than or equal to 2) times of transmission can be obtained

The feedback information includes: n (N) _{success_1_trans} ，N _{success_2_trans} ，…N _{success_1_trans} 。

The number of successful decoding of the first data packet at each transmission time is also referred to as the first type of feedback information.

The proportion of successful decoding of the first packet at each transmission time, the proportion being the actual or quantized value

Assuming that the first blind retransmission number is N, the proportion of successful decoding of the first data packet at each transmission number includes: successfully decoding the proportion of the first data packets to all the first data packets when the transmission times are 1; successfully decoding the proportion of the first data packets to all the first data packets when the transmission times are 2; successfully decoding the proportion of the first data packets to all the first data packets when the transmission times are 3; …; and successfully decoding the proportion of the first data packets accounting for all the first data packets when the transmission time is N.

Taking the ratio as an actual value as an example, assuming phi as a set of all first data packets in the first time period, when the transmission times i pass, the number of successfully decoded first data packets by the receiving end accounts for the ratio P of all first data packets _{success_i} I is a positive integer not greater than N, and the current first blind retransmission number is N, and if the transmission number is i, the proportion of successfully decoding the first data packet to all the first data packets is as follows:

the feedback information includes: p (P) _{success_1} ，P _{success_2} ,…P _{success_N} 。

Taking this ratio as a quantization value as an example, there is the following quantization table:

list one

Proportion (actual value or rounded value of actual value)	Quantized value
0.1	1
0.2	2
0.3	3
0.4	4
0.5	5
0.6	6
0.7	7
0.8	8
0.9	9
1	10

For the proportion of successfully decoding the first data packet at each transmission number, the proportion is processed in a manner of rounding to reserve 1-bit decimal point, and an approximate proportion value is obtained. And then converting the approximate proportion value into a quantized value according to the corresponding relation in the first table. The quantization value can complete feedback by only 4 bits, so that the number of information bits required by feedback information can be effectively reduced.

The proportion of successfully decoding the first data packet at each transmission time is also referred to as the second type of feedback information.

Reference blind retransmission times

The second terminal can also determine the reference blind retransmission times, namely the recommended blind retransmission times, according to the first two feedback information. And determining the reference blind retransmission times as feedback information for the first terminal to refer to when determining the second blind retransmission times. The first terminal may or may not use the reference blind retransmission number as the second blind retransmission number. The second blind retransmission number is greater than or equal to the reference blind retransmission number.

The reference blind retransmission times are also called third feedback information.

Indicated number of blind retransmissions

The second terminal can also determine the indicated blind retransmission times by itself according to the first two feedback information. And determining the indicated blind retransmission times as feedback information for the first terminal to serve as second blind retransmission times. The first terminal directly adopts the indicated blind retransmission times as second blind retransmission times.

The indicated number of blind retransmissions is also referred to as fourth feedback information.

Step 404: the second terminal sends feedback information to the first terminal;

schematically, the second terminal sends feedback information to the first terminal when the trigger condition is satisfied. Wherein the trigger condition includes at least one of the following conditions:

the first number of received first data packets being greater than or equal to a first threshold;

the first threshold is a number of thresholds. For example, the first threshold is 100 or 200.

The second number of successfully decoded first data packets being greater than or equal to a second threshold;

the second threshold is a quantity threshold. For example, the second threshold is 50 or 100.

The time interval from the transmission of the last feedback information is greater than or equal to a third threshold;

the third threshold is a duration threshold. For example, the third threshold is 1 second, 5 seconds, or 10 seconds.

Receiving the COT shared resource reserved by the first terminal;

the COT shared resource is a transmission resource that the first terminal shares or provides or indicates to the second terminal. The COT shared resource is a time slot or slots in the COT that the first terminal occupies after a successful listen-before-talk (Listen Before Talk, LBT).

The COT shared resource is used for the second terminal to send feedback information to the first terminal.

Timer timeout;

illustratively, the timer is set by the second terminal, and the starting time of the timer is the time of transmitting the last feedback information.

The ratio of the second number to the first number is greater than a fourth threshold;

the first number is the number of received first data packets and the second number is the number of successfully decoded first data packets.

And when the ratio of the second number to the first number is larger than a fourth threshold value, the first blind retransmission times are higher.

The ratio of the second number to the first number is smaller than a fifth threshold;

And when the ratio of the second number to the first number is larger than a fourth threshold value, the first blind retransmission times are lower.

Receiving the instruction information transmitted by the first terminal.

The instruction information is information for instructing the second terminal to transmit feedback information. The indication information is transmitted by the first terminal. The indication information may be carried by at least one of radio resource control (PC 5-Radio Resource Control, PC 5-RRC) signaling, medium access control (Medium Access Control Control Element, MAC CE) signaling, and sidestream control information (SideLink Control Information, SCI) of the PC5 interface.

Illustratively, the manner in which the second terminal sends the feedback information to the first terminal includes, but is not limited to, at least one of:

transmitting feedback information to the first terminal using the unlicensed spectrum;

for example, the second terminal performs LBT on the unlicensed spectrum, and after the LBT is successful, the second terminal sends feedback information to the first terminal by using the unlicensed spectrum.

Receiving the COT shared resource provided by the first terminal; adopting COT shared resources to send feedback information to the first terminal;

sending PC5-RRC signaling to the first terminal, the PC5-RRC signaling carrying feedback information;

sending MAC CE signaling to the first terminal, wherein the MAC CE signaling carries feedback information;

send SCI to the first terminal, SCI carrying feedback information.

Step 405: the first terminal receives feedback information, wherein the feedback information is used for representing information related to the transmission times required by the second terminal to successfully decode the first data packet;

accordingly, the manner in which the first terminal receives the feedback information includes, but is not limited to, at least one of:

receiving feedback information sent by the second terminal by adopting an unlicensed spectrum;

providing the COT shared resource to the second terminal; receiving feedback information sent by a second terminal by adopting COT shared resources;

receiving a PC5-RRC signaling sent by the second terminal, wherein the PC5-RRC signaling carries feedback information;

receiving a MAC CE signaling sent by the second terminal, wherein the MAC CE signaling carries feedback information;

receiving SCI sent by the second terminal, the SCI carrying feedback information.

Step 406: the first terminal determines the second blind retransmission times according to the feedback information;

under the condition that the first type of feedback information is received, the first terminal determines the proportion of successfully decoding the first data packet under each transmission time according to the number of successfully decoding the first data packet under each transmission time; and determining the second blind retransmission times according to the proportion of successfully decoding the first data packet under each transmission time.

And under the condition that the second type of feedback information is received, the first terminal determines a second blind retransmission number according to the proportion of successfully decoding the first data packet under each transmission number.

And under the condition that the third type of feedback information is received, the first terminal determines the second blind retransmission times according to the reference blind retransmission times. Optionally, the second blind retransmission number is greater than or equal to the reference blind retransmission number.

And under the condition that the fourth type of feedback information is received, the first terminal determines the second blind retransmission times according to the indicated blind retransmission times. Optionally, the second blind retransmission number is equal to the indicated blind retransmission number.

Taking the unicast scenario shown in fig. 5 as an example, data is sent between the first terminal 1 and the second terminal 2, where the first terminal determines the second blind retransmission times according to the proportion of successfully decoding the first data packet at each transmission time, including:

and when the sum of the proportion of the first data packet successfully decoded is larger than a sixth threshold value under the condition that the sum of the proportion of the first data packet successfully decoded is not larger than the transmission times n, and the transmission times n are the transmission times with the highest proportion of the first data packet successfully decoded in all the transmission times, determining the transmission times n as second blind retransmission times.

And when the sum of the proportion of the first data packet successfully decoded is smaller than a sixth threshold value under the condition that the transmission times n is not larger than the transmission times, wherein the transmission times n are the transmission times with the highest proportion of the first data packet successfully decoded in all the transmission times, determining the transmission times n+1 as the second blind retransmission times.

In one example, assuming that the first blind retransmission number is 3, the feedback information includes a proportion P of successfully decoding the first data packet with a transmission number of 1 _{success_1} Proportion P of successful decoding of first data packet in case of number of transmissions 2 _{success_2} Proportion P of successful decoding of first data packet in case of number of transmissions 3 _{success_3} ：

Example 1: if P _{success_1} <P _{success_2} <P _{success_3} And P is _{success_1} +P _{success_2} +P _{success_3} And (3) determining that the second blind retransmission times are 3. Wherein θ is a threshold value and the value range is 0<And theta is less than or equal to 1, namely that most of the first data packets can be correctly received after three transmissions. For example, P _{success_1} ＝0.1，P _{success_2} ＝0.1，P _{success_3} =0.78, θ=0.95, meaning that 98% of the first data packets can be correctly received after three transmissions, but the probability of the first data packets being successfully received for fewer than three transmissions is low, at which time the second blind retransmission number is 3.

Example 2: if P _{success_1} <P _{success_2} <P _{success_3} And P is _{success_1} +P _{success_2} +P _{success_3} <And theta, determining that the second blind retransmission times are 4. For example, P _{success_1} ＝0.1，P _{success_2} ＝0.1，P _{success_3} =0.2, θ=0.95, meaning that only 40% of the first data packets can be correctly received after three transmissions, at which point the second blind retransmission number is determined to be 4.

Example 3: p (P) _{success_1} <P _{success_2} <P _{success_3} And P is _{success_1} +P _{success_2} And (5) not less than theta, determining that the second blind retransmission times are 2. For example, P _{success_1} ＝0.1，P _{success_2} ＝0.85，P _{success_3} =0.05, θ=0.95, meaning that 95% of the packets can be correctly received after two transmissions, at which point the second blind retransmission number is determined to be 2.

Example 4: p (P) _{success_1} ≥P _{success_3} +P _{success_2} And P is _{success_1} And (5) not less than theta, determining that the second blind retransmission times are 1. For example, P _{success_1} ＝0.96，P _{success_2} ＝0.01，P _{success_3} =0.02, θ=0.95, meaning that 96% of the packets can be correctly received after one transmission, at which time a second blind retransmission is determinedThe number of times was 1.

Taking the multicast scenario shown in fig. 6 as an example, data is transmitted between the first terminal 1 and the plurality of second terminals 2. The first terminal determines the candidate blind retransmission times corresponding to each second terminal according to the feedback information of each second terminal; calculating the proportion of the second terminals corresponding to each candidate blind retransmission number to all the second terminals; and selecting the minimum candidate blind retransmission times with the proportion not smaller than the seventh threshold value, and determining the minimum candidate blind retransmission times as the second blind retransmission times.

The determination mode of the candidate blind retransmission times of the single second terminal is the same as the second blind retransmission times in the unicast scene, and is not repeated.

Example 5: the first terminal receives feedback information from the plurality of second terminals. Firstly, determining the candidate blind retransmission times suitable for each second terminal by using the second blind retransmission times determination method under the unicast scene, and then calculating the proportion of the second terminals selecting various candidate blind retransmission times, for example, the proportion of the second terminal selecting the transmission times 1 to all the second terminals is N1=a%, the proportion of the second terminal selecting the transmission times 2 to all the second terminals is N2=b%, the proportion of the second terminal selecting the transmission times 3 to all the second terminals is N3=c%, and the proportion of the second terminal selecting the transmission times 4 to all the second terminals is N4=d%

Assuming that the finally determined second blind retransmission time is N, selecting a receiving end duty ratio of N with m times of transmission _m The second blind retransmission number N finally determined is the minimum transmission number capable of satisfying the reception requirements of the vast majority of second terminals with θ as the threshold, as follows

For example, n1=10%, n2=80%, n3=5%, n4=5%, θ=90%, and the second blind retransmission number may be determined to be 2.

In the multicast case, the same trigger condition can be set for each second terminal in the group to ensure that each second terminal sends feedback information in a similar time.

Step 407: and the first terminal sends a second data packet to the second terminal according to the second blind retransmission times.

According to the method provided by the embodiment, the feedback information can be sent by the second terminal autonomously, and at the moment, the calculation pressure of the first terminal can be reduced, for example, when the first terminal is a head-assembling terminal in a multicast scene, the calculation pressure is larger; the feedback information can also be triggered to be sent by the second terminal through the indication information or the COT shared resource by the first terminal, so that the first terminal can conveniently acquire the feedback information from the second terminal in a mode similar to active inquiry according to the requirement of sending the data packet by the first terminal, and the autonomy of the first terminal is improved.

According to the method provided by the embodiment, the second blind retransmission times are reasonably set according to the receiving requirements of most second terminals. On one hand, the problem that the successful decoding probability of the receiving end is lower when the blind retransmission times selected by the sending end are too small is avoided; on the other hand, when the number of blind retransmissions selected by the transmitting end is too large, the problem that too many unnecessary channel resources are occupied is avoided.

The method for determining the reference blind retransmission times or the indicated blind retransmission times by the second terminal is the same as the method for determining the second blind retransmission times by the first terminal in the unicast scene. Namely:

and when the sum of the proportion of the first data packet successfully decoded is larger than a sixth threshold value under the condition that the sum of the proportion of the first data packet successfully decoded is not larger than the transmission times n, wherein the transmission times n are the transmission times with the highest proportion of the first data packet successfully decoded in all the transmission times, determining the transmission times n as the reference blind retransmission times or the indicated blind retransmission times.

And when the sum of the proportion of the first data packet successfully decoded is smaller than a sixth threshold value under the condition that the transmission times n is not greater than the transmission times, wherein the transmission times n are the transmission times with the highest proportion of the first data packet successfully decoded in all the transmission times, determining the transmission times n+1 as the reference blind retransmission times or the indicated blind retransmission times.

In one example, assuming that the first blind retransmission number is 2 and the transmission number is 3, the feedback information includes the proportion P of successfully decoding the first data packet with the transmission number of 1 _{success_1} Proportion P of successful decoding of first data packet in case of number of transmissions 2 _{success_2} Proportion P of successful decoding of first data packet in case of number of transmissions 3 _{success_3} ：

Example 1: if P _{success_1} <P _{success_2} <P _{success_3} And P is _{success_1} +P _{success_2} +P _{success_3} And (3) determining the reference blind retransmission times or the indicated blind retransmission times to be 3. Wherein θ is a threshold value and the value range is 0<And theta is less than or equal to 1, namely that most of the first data packets can be correctly received after three transmissions. For example, P _{success_1} ＝0.1，P _{success_2} ＝0.1，P _{success_3} =0.78, θ=0.95, meaning that 98% of the first data packets can be correctly received after three transmissions, but the probability of the first data packets being successfully received for fewer than three transmissions is low, at which point the reference blind retransmission number or indicated blind retransmission number is determined to be 3.

Example 2: if P _{success_1} <P _{success_2} <P _{success_3} And P is _{success_1} +P _{success_2} +P _{success_3} <And theta, determining the reference blind retransmission times or the indicated blind retransmission times as 4. For example, P _{success_1} ＝0.1，P _{success_2} ＝0.1，P _{success_3} =0.2, θ=0.95, meaning that only 40% of the first data packets can be correctly received after three transmissions, when the recommended number of blind retransmissions is determined to be 4.

Example 3: p (P) _{success_1} <P _{success_2} <P _{success_3} And P is _{success_1} +P _{success_2} And (2) determining the reference blind retransmission times or the indicated blind retransmission times as 2. For example, P _{success_1} ＝0.1，P _{success_2} ＝0.85，P _{success_3} =0.05, θ=0.95, meaning that 95% of the packets can be correctly received after two transmissions, at which point the reference or indicated blind retransmission number is determined to be 2.

Example 4: p (P) _{success_1} ≥P _{success_3} +P _{success_2} And P is _{success_1} And (3) not less than theta, determining the reference blind retransmission times or the indicated blind retransmission times as 1. For example, P _{success_1} ＝0.96，P _{success_2} ＝0.01，P _{success_3} =0.02, θ=0.95, meaning that 96% of the packets can be correctly received after one transmission, at which point the reference or indicated blind retransmission number is determined to be 1.

Fig. 7 shows a block diagram of a blind retransmission apparatus provided in an exemplary embodiment of the present application. The apparatus may be implemented as, part of, or applied in a first terminal, the apparatus comprising:

a sending module 720, configured to send a first data packet to the second terminal according to the first blind retransmission times;

a receiving module 740, configured to feedback information, where the feedback information is used to characterize information related to the number of transmissions required by the second terminal to successfully decode the first data packet;

the sending module 720 is configured to send a second data packet to the second terminal according to a second blind retransmission number, where the second blind retransmission number is determined according to the feedback information.

In an optional design of the embodiment of the present application, the feedback information is generated by the second terminal according to a number of transmission times required for successfully decoding each first data packet in the first period; wherein:

the first time period is a time period after the second terminal transmits the last feedback information; or, the first period of time is a period of time determined according to a timer.

In an optional design of the embodiment of the present application, the feedback information is sent by the second terminal when a trigger condition is met, where the trigger condition includes at least one of the following conditions:

the first number is greater than or equal to a first threshold, and the first number is the number of the received first data packets;

a second number greater than or equal to a second threshold, the second number being the number of successfully decoded first data packets;

the time interval from the last feedback information is greater than or equal to a third threshold;

receiving COT shared resources reserved by the first terminal;

the timer times out;

the ratio of the second number to the first number is less than a fifth threshold;

And receiving the indication information sent by the first terminal.

In an optional design of the embodiments of the present application, the feedback information includes at least one of:

successfully decoding the number of the first data packets under each transmission frequency;

the proportion of the first data packet is successfully decoded under each transmission frequency, wherein the proportion is an actual value or a quantized value;

the number of blind retransmissions referred to;

indicated number of blind retransmissions.

In an optional design of the embodiment of the present application, the receiving module 740 is configured to receive the feedback information sent by the second terminal using an unlicensed spectrum; or, the receiving module 740 is configured to provide the COT shared resource to the second terminal; receiving the feedback information sent by the second terminal by adopting the COT shared resource; or, the receiving module 740 is configured to receive a PC5-RRC signaling sent by the second terminal, where the PC5-RRC signaling carries the feedback information; or, the receiving module 740 is configured to receive a MAC CE signaling sent by the second terminal, where the MAC CE signaling carries the feedback information; or, the receiving module 740 is configured to receive the SCI sent by the second terminal, where the SCI carries the feedback information.

In an alternative design of an embodiment of the present application, the apparatus further includes:

a determining module 760, configured to determine the second blind retransmission times according to the feedback information.

In an optional design of the embodiment of the present application, the determining module 760 is configured to determine, according to the number of successfully decoded first data packets at each transmission number, a proportion of successfully decoded first data packets at each transmission number; determining the second blind retransmission times according to the proportion of successfully decoding the first data packet under each transmission time; or, the determining module 760 is configured to determine the second blind retransmission number according to the proportion of the first data packet successfully decoded at each transmission number.

In an optional design of the embodiment of the present application, the determining module 760 is configured to determine, when the sum of the proportion of the first data packet successfully decoded is not greater than the transmission number n and the sum of the proportion of the first data packet successfully decoded is greater than a sixth threshold, the transmission number n is a transmission number with the highest proportion of successfully decoded first data packets among all the transmission numbers, as the second blind retransmission number.

In an optional design of the embodiment of the present application, the determining module 760 is configured to determine, when the ratio of the first packet to be successfully decoded is not greater than the number of transmission times n, and the sum of the number of transmission times n is less than a sixth threshold, where the number of transmission times n is a number of transmission times with the highest ratio of successful decoding of the first packet among all the number of transmission times, the number of transmission times n+1 is determined as the second blind retransmission number.

In an optional design of the embodiment of the present application, the second terminals are multiple in a multicast scenario, and the determining module 760 is configured to determine, according to feedback information of each second terminal, a candidate blind retransmission number corresponding to each second terminal; calculating the proportion of the second terminals corresponding to each candidate blind retransmission number to all the second terminals; and selecting the minimum blind retransmission candidate times with the proportion not smaller than a seventh threshold value, and determining the minimum blind retransmission candidate times as the second blind retransmission times.

Fig. 8 shows a block diagram of a blind retransmission apparatus provided in an exemplary embodiment of the present application. The apparatus may be implemented as, part of, or applied in a second terminal, the apparatus comprising:

a receiving module 820, configured to receive a first data packet, where the first data packet is sent by a first terminal according to a first blind retransmission number;

a sending module 840, configured to send feedback information to the first terminal, where the feedback information is used to characterize information related to a number of transmissions required by the device to successfully decode the first data packet;

the receiving module 820 is configured to receive a second data packet, where the second data packet is sent by the first terminal according to a second blind retransmission number, and the second blind retransmission number is determined according to the feedback information.

a generating module 860, configured to generate the feedback information according to the number of transmission times required for successfully decoding each first data packet in the first period;

wherein the first time period is a time period after the second terminal transmits the last feedback information; or, the first period of time is a period of time determined according to a timer.

In an optional design of the embodiment of the present application, the sending module 840 is configured to send feedback information to the first terminal when a trigger condition is met; wherein the trigger condition includes at least one of the following conditions:

receiving COT shared resources reserved by the first terminal;

the timer times out;

and receiving the indication information sent by the first terminal.

the number of blind retransmissions referred to;

indicated number of blind retransmissions.

In an optional design of the embodiment of the present application, the sending module 840 is configured to send the feedback information to the first terminal using an unlicensed spectrum; or, the sending module 840 is configured to receive the COT shared resource provided by the first terminal; transmitting the feedback information to the first terminal by adopting the COT shared resource; or, the sending module 840 is configured to send a PC5-RRC signaling to the first terminal, where the PC5-RRC signaling carries the feedback information; or, the sending module 840 is configured to send a MAC CE signaling to the first terminal, where the MAC CE signaling carries the feedback information; or, the sending module 840 is configured to send an SCI to the first terminal, where the SCI carries the feedback information.

a generating module 860, configured to determine the recommended blind retransmission times according to the proportion of successfully decoding the first data packet at each transmission time.

In an optional design of the embodiment of the present application, the generating module 860 is configured to determine, when the sum of the proportion of the first data packet successfully decoded is not greater than the transmission number n and the transmission number n is the transmission number with the highest proportion of successfully decoding the first data packet in all the transmission numbers, the transmission number n as the reference blind retransmission number or the indicated blind retransmission number.

In an optional design of the embodiment of the present application, the generating module 860 is configured to determine, when the sum of the proportion of the first data packet successfully decoded is not greater than the transmission number n and the proportion of the first data packet successfully decoded is less than a sixth threshold, where the transmission number n is a transmission number with the highest proportion of successfully decoded first data packets in all transmission numbers, the transmission number n+1 as the reference blind retransmission number or the indicated blind retransmission number.

Fig. 9 shows a schematic structural diagram of a communication device (network device or terminal) according to an exemplary embodiment of the present application, where the communication device includes: a processor 101, a receiver 102, a transmitter 103, a memory 104, and a bus 105.

The processor 101 includes one or more processing cores, and the processor 101 executes various functional applications and information processing by running software programs and modules.

The receiver 102 and the transmitter 103 may be implemented as one communication component, which may be a communication chip.

The memory 104 is connected to the processor 101 via a bus 105.

The memory 104 may be used to store at least one instruction that the processor 101 is configured to execute to implement the various steps of the method embodiments described above.

Further, the memory 104 may be implemented by any type of volatile or nonvolatile storage device or combination thereof, including but not limited to: magnetic or optical disks, electrically erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EEPROM), erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), static random access Memory (Static Random Access Memory, SRAM), read-Only Memory (ROM), magnetic Memory, flash Memory, programmable Read-Only Memory (Programmable Read-Only Memory, PROM).

In an exemplary embodiment, there is also provided a computer readable storage medium having stored therein at least one instruction, at least one program, a set of codes, or a set of instructions, which are loaded and executed by the processor to implement the blind retransmission method performed by the first terminal or the second terminal provided in the above respective method embodiments.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

The foregoing description of the embodiments is merely illustrative of the principles and spirit of the embodiments, and the invention is not limited to the embodiments and is to cover all modifications, equivalents, improvements and alternatives falling within the spirit and scope of the embodiments.

Claims

A blind retransmission method, applied in a first terminal, comprising:

Sending a first data packet to a second terminal according to the first blind retransmission times;

receiving feedback information, wherein the feedback information is used for representing information related to the transmission times required by the second terminal to successfully decode the first data packet;

and sending a second data packet to the second terminal according to the second blind retransmission times, wherein the second blind retransmission times are determined according to the feedback information.
The method of claim 1, wherein the feedback information is generated by the second terminal based on a number of transmissions required to successfully decode the first data packet in a first time period; wherein:

the first time period is a time period after the second terminal transmits the last feedback information;

or alternatively, the first and second heat exchangers may be,

the first time period is a time period determined according to a timer.
The method of claim 1, wherein the feedback information is sent by the second terminal when a trigger condition is met, the trigger condition comprising at least one of:

the first number is greater than or equal to a first threshold, and the first number is the number of the received first data packets;

a second number greater than or equal to a second threshold, the second number being the number of successfully decoded first data packets;

The time interval from the last feedback information is greater than or equal to a third threshold;

receiving a channel occupation duration COT shared resource reserved by the first terminal;

the timer times out;

the ratio of the second number to the first number is greater than a fourth threshold;

the ratio of the second number to the first number is less than a fifth threshold;

and receiving the indication information sent by the first terminal.
The method of claim 1, wherein the feedback information comprises at least one of:

successfully decoding the number of the first data packets under each transmission frequency;

the proportion of the first data packet is successfully decoded under each transmission frequency, wherein the proportion is an actual value or a quantized value;

the number of blind retransmissions referred to;

indicated number of blind retransmissions.
The method of claim 1, wherein the receiving feedback information comprises:

receiving the feedback information sent by the second terminal by adopting an unlicensed spectrum;

or alternatively, the first and second heat exchangers may be,

providing COT shared resources to the second terminal; receiving the feedback information sent by the second terminal by adopting the COT shared resource;

or alternatively, the first and second heat exchangers may be,

receiving a PC5 interface radio resource control (PC 5-RRC) signaling sent by the second terminal, wherein the PC5-RRC signaling carries the feedback information;

Or alternatively, the first and second heat exchangers may be,

receiving a media access control unit (MAC CE) signaling sent by the second terminal, wherein the MAC CE signaling carries the feedback information;

or alternatively, the first and second heat exchangers may be,

and receiving side uplink information SCI sent by the second terminal, wherein the SCI carries the feedback information.
The method according to any one of claims 1 to 5, further comprising:

and determining the second blind retransmission times according to the feedback information.
The method of claim 6, wherein the determining the second blind retransmission number based on feedback information comprises:

determining the proportion of successfully decoding the first data packet under each transmission time according to the number of successfully decoding the first data packet under each transmission time; determining the second blind retransmission times according to the proportion of successfully decoding the first data packet under each transmission time;

or alternatively, the first and second heat exchangers may be,

and determining the second blind retransmission times according to the proportion of successfully decoding the first data packet under each transmission time.
The method of claim 7, wherein determining the second blind retransmission number based on the proportion of successful decoding of the first data packet at each transmission number comprises:

And when the sum of the proportion of the first data packet successfully decoded is larger than a sixth threshold value under the condition that the sum of the proportion of the first data packet successfully decoded is not larger than the transmission times n, and the transmission times n are the transmission times with the highest proportion of the first data packet successfully decoded in all the transmission times, determining the transmission times n as the second blind retransmission times.
The method of claim 7, wherein determining the second blind retransmission number based on the proportion of successful decoding of the first data packet at each transmission number comprises:

and when the ratio of the first data packet successfully decoded is not greater than the transmission times n and is smaller than a sixth threshold value, and the transmission times n are the transmission times with the highest ratio of successfully decoding the first data packet in all the transmission times, determining the transmission times n+1 as the second blind retransmission times.
The method of claim 6, wherein the second terminal is a plurality of the second terminals in a multicast scenario, and the determining the second blind retransmission times according to the feedback information includes

According to feedback information of each second terminal, determining candidate blind retransmission times corresponding to each second terminal;

calculating the proportion of the second terminals corresponding to each candidate blind retransmission number to all the second terminals;

And selecting the minimum blind retransmission candidate times with the proportion not smaller than a seventh threshold value, and determining the minimum blind retransmission candidate times as the second blind retransmission times.
A blind retransmission method, applied in a second terminal, the method comprising:

receiving a first data packet, wherein the first data packet is sent by a first terminal according to first blind retransmission times;

sending feedback information to the first terminal, wherein the feedback information is used for representing information related to the transmission times required by the second terminal to successfully decode the first data packet;

and receiving a second data packet, wherein the second data packet is sent by the first terminal according to a second blind retransmission time, and the second blind retransmission time is determined according to the feedback information.
The method of claim 11, wherein the method further comprises:

generating the feedback information according to the transmission times required by successfully decoding the first data packet in a first time period;

wherein the first time period is a time period after the second terminal transmits the last feedback information; or, the first period of time is a period of time determined according to a timer.
The method of claim 11, wherein the sending feedback information to the first terminal comprises:

When the triggering condition is met, feedback information is sent to the first terminal; wherein the trigger condition includes at least one of the following conditions:

the first number is greater than or equal to a first threshold, and the first number is the number of the received first data packets;

a second number greater than or equal to a second threshold, the second number being the number of successfully decoded first data packets;

the time interval from the last feedback information is greater than or equal to a third threshold;

receiving a channel occupation duration COT shared resource reserved by the first terminal;

the timer times out;

the ratio of the second number to the first number is greater than a fourth threshold;

the ratio of the second number to the first number is less than a fifth threshold;

and receiving the indication information sent by the first terminal.
The method of claim 11, wherein the feedback information comprises at least one of:

successfully decoding the number of the first data packets under each transmission frequency;

the proportion of the first data packet is successfully decoded under each transmission frequency, wherein the proportion is an actual value or a quantized value;

the number of blind retransmissions referred to;

Indicated number of blind retransmissions.
The method of claim 11, wherein the sending feedback information to the first terminal comprises:

transmitting the feedback information to the first terminal by adopting an unlicensed spectrum;

or alternatively, the first and second heat exchangers may be,

receiving COT shared resources provided by the first terminal; transmitting the feedback information to the first terminal by adopting the COT shared resource;

or alternatively, the first and second heat exchangers may be,

sending PC5 radio resource control (PC 5-RRC) signaling to the first terminal, wherein the PC5-RRC signaling carries the feedback information;

or alternatively, the first and second heat exchangers may be,

transmitting a media access control unit (MAC CE) signaling to the first terminal, wherein the MAC CE signaling carries the feedback information;

or alternatively, the first and second heat exchangers may be,

and sending lateral control information SCI to the first terminal, wherein the SCI carries the feedback information.
The method of claim 14, wherein the method further comprises:

and determining the reference blind retransmission times or the indicated blind retransmission times according to the proportion of successfully decoding the first data packet under each transmission times.
The method of claim 16, wherein the determining the reference blind retransmission times or the indicated blind retransmission times based on the proportion of successful decoding of the first data packet at each transmission time comprises:

And when the sum of the proportion of the first data packet successfully decoded is not larger than the transmission times n and is larger than a sixth threshold value, and the transmission times n are the transmission times with the highest proportion of successfully decoded first data packets in all the transmission times, determining the transmission times n as the reference blind retransmission times or the indicated blind retransmission times.
The method of claim 16, wherein the determining the reference blind retransmission times or the indicated blind retransmission times based on the proportion of successful decoding of the first data packet at each transmission time comprises:

and when the ratio of the first data packet is successfully decoded and is smaller than a sixth threshold value under the condition that the transmission times n is not greater than the transmission times, and the transmission times n are the transmission times with the highest ratio of successfully decoding the first data packet in all the transmission times, determining the transmission times n+1 as the reference blind retransmission times or the indicated blind retransmission times.
A blind retransmission apparatus, the apparatus comprising:

the sending module is used for sending a first data packet to the second terminal according to the first blind retransmission times;

the receiving module is used for feeding back information, and the feedback information is used for representing information related to the transmission times required by the second terminal to successfully decode the first data packet;

And the sending module is used for sending a second data packet to the second terminal according to the second blind retransmission times, wherein the second blind retransmission times are determined according to the feedback information.
The apparatus of claim 19, wherein the feedback information is generated by the second terminal based on a number of transmissions required to successfully decode each first data packet during a first period of time; wherein:

the first time period is a time period after the second terminal transmits the last feedback information;

or alternatively, the first and second heat exchangers may be,

the first time period is a time period determined according to a timer.
The apparatus of claim 19, wherein the feedback information is sent by the second terminal when a trigger condition is met, the trigger condition comprising at least one of:

the first number is greater than or equal to a first threshold, and the first number is the number of the received first data packets;

a second number greater than or equal to a second threshold, the second number being the number of successfully decoded first data packets;

the time interval from the last feedback information is greater than or equal to a third threshold;

receiving a channel occupation duration COT shared resource reserved by the first terminal;

The timer times out;

the ratio of the second number to the first number is greater than a fourth threshold;

the ratio of the second number to the first number is less than a fifth threshold;

and receiving the indication information sent by the first terminal.
The apparatus of claim 19, wherein the feedback information comprises at least one of:

successfully decoding the number of the first data packets under each transmission frequency;

the proportion of the first data packet is successfully decoded under each transmission frequency, wherein the proportion is an actual value or a quantized value;

the number of blind retransmissions referred to;

indicated number of blind retransmissions.
The apparatus of claim 19, wherein the device comprises a plurality of sensors,

the receiving module is used for receiving the feedback information sent by the second terminal by adopting an unlicensed spectrum;

or alternatively, the first and second heat exchangers may be,

the receiving module is configured to provide a COT shared resource to the second terminal; receiving the feedback information sent by the second terminal by adopting the COT shared resource;

or alternatively, the first and second heat exchangers may be,

the receiving module is configured to receive a PC5-RRC signaling sent by the second terminal, where the PC5-RRC signaling carries the feedback information;

Or alternatively, the first and second heat exchangers may be,

the receiving module is configured to receive a media access control unit MAC CE signaling sent by the second terminal, where the MAC CE signaling carries the feedback information;

or alternatively, the first and second heat exchangers may be,

the receiving module is configured to receive a sidestream control information SCI sent by the second terminal, where the SCI carries the feedback information.
The apparatus according to any one of claims 19 to 23, further comprising:

and the determining module is used for determining the second blind retransmission times according to the feedback information.
The apparatus of claim 24, wherein the device comprises a plurality of sensors,

the determining module is used for determining the proportion of successfully decoding the first data packet under each transmission time according to the number of successfully decoding the first data packet under each transmission time; determining the second blind retransmission times according to the proportion of successfully decoding the first data packet under each transmission time;

or alternatively, the first and second heat exchangers may be,

and the determining module is used for determining the second blind retransmission times according to the proportion of successfully decoding the first data packet under each transmission time.
The apparatus of claim 25, wherein the determining module is configured to determine the number of transmissions n as the second blind retransmission number when the sum of the proportion of successfully decoding the first data packet is not greater than a number of transmissions n, and the number of transmissions n is a highest proportion of successfully decoding the first data packet among all the transmissions.
The apparatus of claim 25, wherein the determining module is configured to determine the number of transmissions n+1 as the second blind retransmission number when the sum of the proportion of successfully decoding the first data packet is not greater than a number of transmissions n, and the number of transmissions n is a highest proportion of successfully decoding the first data packet among all the transmissions.
The apparatus of claim 24, wherein the second terminals are a plurality of second terminals in a multicast scenario, and the determining module is configured to determine, according to feedback information of each second terminal, a candidate blind retransmission number corresponding to each second terminal; calculating the proportion of the second terminals corresponding to each candidate blind retransmission number to all the second terminals; and selecting the minimum blind retransmission candidate times with the proportion not smaller than a seventh threshold value, and determining the minimum blind retransmission candidate times as the second blind retransmission times.
A blind retransmission apparatus, the apparatus comprising:

the receiving module is used for receiving a first data packet, wherein the first data packet is sent by a first terminal according to first blind retransmission times;

a sending module, configured to send feedback information to the first terminal, where the feedback information is used to characterize information related to a number of transmissions required by the device to successfully decode the first data packet;

The receiving module is configured to receive a second data packet, where the second data packet is sent by the first terminal according to a second blind retransmission number, and the second blind retransmission number is determined according to the feedback information.
The apparatus of claim 29, wherein the apparatus further comprises:

the generation module is used for generating the feedback information according to the transmission times required by successfully decoding each first data packet in the first time period;

wherein the first time period is a time period after the second terminal transmits the last feedback information; or, the first period of time is a period of time determined according to a timer.
The apparatus of claim 29, wherein the device comprises a plurality of sensors,

the sending module is used for sending feedback information to the first terminal when the triggering condition is met; wherein the trigger condition includes at least one of the following conditions:

the first number is greater than or equal to a first threshold, and the first number is the number of the received first data packets;

a second number greater than or equal to a second threshold, the second number being the number of successfully decoded first data packets;

The time interval from the last feedback information is greater than or equal to a third threshold;

receiving a channel occupation duration COT shared resource reserved by the first terminal;

the timer times out;

the ratio of the second number to the first number is greater than a fourth threshold;

the ratio of the second number to the first number is less than a fifth threshold;

and receiving the indication information sent by the first terminal.
The apparatus of claim 29, wherein the feedback information comprises at least one of:

successfully decoding the number of the first data packets under each transmission frequency;

the proportion of the first data packet is successfully decoded under each transmission frequency, wherein the proportion is an actual value or a quantized value;

the number of blind retransmissions referred to;

indicated number of blind retransmissions.
The apparatus of claim 29, wherein the device comprises a plurality of sensors,

the sending module is used for sending the feedback information to the first terminal by adopting an unlicensed spectrum;

or alternatively, the first and second heat exchangers may be,

the sending module is used for receiving the communication COT shared resource provided by the first terminal; transmitting the feedback information to the first terminal by adopting the COT shared resource;

or alternatively, the first and second heat exchangers may be,

The sending module is configured to send a PC5 interface radio resource control PC5-RRC signaling to the first terminal, where the PC5-RRC signaling carries the feedback information;

or alternatively, the first and second heat exchangers may be,

the sending module is configured to send a media access control unit MAC CE signaling to the first terminal, where the MAC CE signaling carries the feedback information;

or alternatively, the first and second heat exchangers may be,

the sending module is configured to send side line control information SCI to the first terminal, where the SCI carries the feedback information.
The apparatus of claim 33, wherein the apparatus further comprises:

and the generation module is used for determining the reference blind retransmission times or the indicated blind retransmission times according to the proportion of successfully decoding the first data packet under each transmission times.
The apparatus of claim 34, wherein the means for generating is configured to determine the number of transmissions n as the reference blind retransmission number or the indicated blind retransmission number when the sum of the proportion of successfully decoding the first data packet is not greater than a number of transmissions n, and the number of transmissions n is a highest proportion of successfully decoding the first data packet among all the transmissions.
The apparatus of claim 34, wherein the generating module is configured to determine a number of transmissions n+1 as the reference blind retransmission number or the indicated blind retransmission number when the sum of the proportion of successfully decoding the first data packet is not greater than a number of transmissions n, and the number of transmissions n is a highest proportion of successfully decoding the first data packet among all the transmissions.
A terminal, the terminal comprising:

a processor;

a transceiver coupled to the processor;

a memory for storing executable instructions of the processor;

wherein the processor is configured to load and execute the executable instructions to implement the blind retransmission method of any one of claims 1 to 18.
A computer readable storage medium having stored therein executable instructions that are loaded and executed by the processor to implement the blind retransmission method of any one of claims 1 to 18.