CN111417078B - Relay terminal selection method and terminal - Google Patents

Abstract

The present invention provides a method for selecting a relay terminal and a terminal, belonging to the technical field of wireless communication, wherein the method for selecting a relay terminal is applied to a terminal, including: a first determination step: if the terminal meets the selection criteria of the remote terminal, Determine to become a remote terminal; the measurement step: measure the candidate relay terminals in the terminal queue, generate candidate information and broadcast it according to the measurement result; the receiving step: receive the candidate information broadcast by other remote terminals in the terminal queue; the second Determining step: obtaining a finally determined relay terminal according to the generated and received candidate information. Through the above method, the present invention can select a suitable relay terminal for the remote terminal in combination with the specific application scenario, which not only ensures the normal reception of data by the remote terminal, but also minimizes the number of relay terminals, saves energy consumption, and reduces the number of relay terminals. Air interface resource usage.

Description

Method and terminal for selecting relay terminal

technical field

The present invention relates to the technical field of wireless communication, and in particular, to a method and terminal for selecting a relay terminal.

Background technique

In existing standards, Long Term Evolution (LTE)-Vehicle to everything (V2X) technology does not support relay (Relay), and Device to Device (D2D) technology supports relay, The existing relay selection process in sidelink mode includes: a terminal (User Equipment, UE) first selects a UE whose reference signal received power (Sidelink-Reference Signal Receiving Power, SD-RSRP) in the sidelink mode is located in a certain interval as a candidate. relay terminal, and then randomly select one of the candidate relay terminals as its own relay terminal, and then establish a one-to-one correspondence with the relay terminal. For example, if the SD-RSRP of a terminal satisfies the following requirements: SD-RSRP>qRxLevMin+minHyst, the terminal can be used as a candidate relay terminal. The remote (Remote) terminal UE1 receives signals from a large number of candidate relay terminals, and selects the candidate relay terminal closest to itself (ie UE1) from the candidate relay terminals whose SD-RSRP is located between thresLow+hystMin and thresHigh-hystMax , as its own candidate relay terminal.

In the vehicle network fleet scenario, due to the distance, the vehicles at the rear of the vehicle may not be able to detect the data sent by the vehicle at the front of the vehicle. Therefore, it is necessary to introduce relay vehicles into the fleet to ensure that the vehicles at the rear of the fleet can normally receive the front and roadside units ( Road Side Unit, RSU) or the broadcast data of the base station. Since the relay vehicles need to broadcast more signals and consume more fuel, in order to reduce fuel consumption expenses and reduce the occupancy rate of air interface resources, it is necessary to minimize the number of relay vehicles in the fleet while ensuring the normal communication of the fleet. Choose as few relay cars as possible for the cars at the rear of the fleet that cannot receive the head signal (ie Remote cars).

Considering that in the fleet scenario, due to the small distance between two vehicles, the probability of shadowing effect is small. Therefore, under normal circumstances, the path loss is mainly related to the distance between vehicles. The smaller the distance between vehicles, the smaller the road loss. Therefore, in the prior art, the vehicle closest to the Remote vehicle is often selected as the relay vehicle. As shown in FIG. 1 , the car 3 is a Remote car. Using the method for selecting a relay terminal in the prior art, the car 2 closest to the car 3 is directly selected as the relay car of the car 3 .

Although, in a straight-line driving scenario, the closer the distance between two vehicles in the fleet is, the smaller the path loss is. However, in the cornering scenario, there is a situation in which the distance between the relatively close cars is greater than the distance between the relatively far cars. The specific scene is shown in Figure 2. Although the car 2 is adjacent to the car 3, the car 3 is closer to the car 1. . Referring to Figures 1 and 2, when the convoy is driving and turning, the reference signal of car 1 received by car 3 is larger than the reference signal of car 2, so it is not suitable to use car 2 as the relay car of car 3.

Therefore, how to select an appropriate relay terminal and minimize the number of relay terminals while ensuring normal data reception is a technical problem that needs to be solved urgently at present.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a method and terminal for selecting a relay terminal, which are used to solve the problem that the current method for selecting a relay terminal is unreasonable.

In order to solve the above technical problems, in a first aspect, the present invention provides a method for selecting a relay terminal, which is applied to a terminal, and is characterized in that:

The first determination step: if the terminal meets the selection criteria of the remote terminal, it is determined to become a remote terminal;

Measurement step: measure the candidate relay terminals in the terminal queue, generate candidate information and broadcast it according to the measurement results;

Receiving step: receiving candidate information broadcast by other remote terminals in the terminal queue;

The second determination step: obtaining a finally determined relay terminal according to the generated and received candidate information.

Preferably, the candidate information includes a ranking list, and the ranking list includes some or all of the measured candidate relay terminals;

The measuring steps include:

Within a preset measurement time, measure the pass-through mode reference signal received power SD-RSRP of the candidate relay terminal, and sort the measured SD-RSRP in ascending order or descending order;

The sorted list is generated according to the sorting result.

Preferably, the second determining step includes:

obtaining the candidate relay terminal that appears most frequently in the sorted list;

The finally determined relay terminal is obtained according to the candidate relay terminal with the largest number of occurrences.

Preferably, the step of obtaining the finally determined relay terminal according to the candidate relay terminal with the most occurrences includes:

If there is only one candidate relay terminal with the most occurrences, the candidate relay terminal with the most occurrences is used as the finally determined relay terminal;

If there are at least two candidate relay terminals with the most occurrences, sort at least two candidate relay terminals with the most occurrences, and use the candidate relay terminal with the highest priority as the final determined relay terminal.

Preferably, in the sorting list, the order of the candidate relay terminals is the order of SD-RSRP from large to small;

The step of sorting at least two candidate relay terminals with the most occurrences, and using the candidate relay terminal with the highest priority as the finally determined relay terminal includes:

For each candidate relay terminal with the most occurrences, obtain the ranking of the candidate relay terminal with the most occurrence in each of the sorting lists, and calculate the sum of the rankings;

Arrange in ascending order of the sum of the rankings, and take the candidate relay terminal with the smallest sum of the rankings and the most frequent occurrences as the candidate relay terminal with the highest priority.

Preferably, the step of using the candidate relay terminal with the smallest sum of rankings as the candidate relay terminal with the highest priority includes:

If the number of candidate relay terminals with the smallest sum of rankings is at least 2, the candidate relay terminals with the smallest sum of rankings and the candidate with the farthest distance from the first terminal in the terminal queue are selected. The relay terminal is used as the candidate relay terminal with the highest priority.

Preferably, the candidate information includes a candidate relay terminal determined by a remote terminal;

The second determining step includes:

determining a decision-making terminal from the remote terminal and the other remote terminals according to the relative position of the remote terminal in the terminal queue and the relative position of the other remote terminals in the terminal queue;

The candidate relay terminal determined by the decision terminal is used as the finally determined relay terminal.

Preferably, the measuring step includes:

Within the preset measurement time, measure the SD-RSRP of the candidate relay terminal, and sort the SD-RSRP obtained by the measurement in ascending order or descending order;

It is determined that the candidate relay terminal with the largest SD-RSRP is the candidate relay terminal determined by the remote terminal.

Preferably, the candidate relay terminal is a terminal in the terminal queue that meets the relay criterion and has sent a sounding reference signal within the preset measurement time.

Preferably, the decision-making terminal is determined from the remote terminal and the other remote terminals according to the relative position of the remote terminal in the terminal queue and the relative position of the other remote terminals in the terminal queue The steps include:

The terminal that is closest to the first terminal in the terminal queue among the remote terminal and the other remote terminals is used as the decision terminal.

Preferably, before the second determining step, it further includes:

broadcast the relative position of the remote terminal in the terminal queue; and/or

The relative position of the other remote terminal in the terminal queue that receives the broadcast of the other remote terminal.

Preferably, after the second determining step, it further includes:

If the remote terminal can establish a relay connection with the finally determined relay terminal, establish a relay connection with the finally determined relay terminal;

If the remote terminal cannot establish a relay connection with the finally determined relay terminal, perform the elimination step, the reselection step and the connection step;

The exclusion step: determining that the finally determined relay terminal is not a candidate relay terminal corresponding to the remote terminal;

The reselection step: re-execute the first determining step, the measuring step, the receiving step and the second determining step to obtain a new and finally determined relay terminal;

The connection step: if a relay connection can be established with the new finalized relay terminal, a relay connection is established with the new finalized relay terminal; if the remote terminal cannot be connected with the new finalized relay terminal. The finally determined relay terminal establishes a relay connection, and repeats the exclusion step and the reselection step until a relay terminal that can be connected to the remote terminal is obtained, and the relay terminal that can be connected to the remote terminal is obtained. The relay terminal establishes a relay connection.

In a second aspect, the present invention also provides a terminal, comprising:

a processor for performing the first determining step, the measuring step, the receiving step and the second determining step;

The first determination step: if the terminal complies with the selection criteria of the remote terminal, it is determined to be a remote terminal;

The measurement step: measure the candidate relay terminals in the terminal queue, and generate candidate information and broadcast it according to the measurement result;

The receiving step: receiving candidate information broadcast by other remote terminals in the terminal queue;

The second determining step: obtaining the finally determined relay terminal according to the generated and received candidate information.

Preferably, the candidate information includes a ranking list, and the ranking list includes some or all of the measured candidate relay terminals;

The processor is configured to measure the pass-through mode reference signal received power SD-RSRP of the candidate relay terminal within a preset measurement time, and measure the SD-RSRP obtained by measurement in ascending order or descending order. according to the order of sorting; generate the sorting list according to the sorting result.

Preferably, the processor is configured to acquire the candidate relay terminal that appears the most times in the sorted list; and obtain the finally determined relay terminal according to the candidate relay terminal that appears the most times.

Preferably, the processor is configured to, if there is only one candidate relay terminal with the most occurrences, take the candidate relay terminal with the most occurrences as the finally determined relay terminal; There are at least two candidate relay terminals with the greatest number of times, and the at least two candidate relay terminals with the most occurrence times are sorted, and the candidate relay terminal with the highest priority is used as the finally determined relay terminal.

Preferably, in the sorting list, the order of the candidate relay terminals is the order of SD-RSRP from large to small;

The processor is configured to, for each of the candidate relay terminals with the most occurrences, obtain the rank of the candidate relay terminal with the most occurrences in each of the sorting lists, and calculate the rank of the candidate relay terminal with the most appearances. sum; arrange in ascending order of the sum of the rank, and take the candidate relay terminal with the smallest sum of rank and the highest number of occurrences as the candidate relay terminal with the highest priority.

Preferably, the processor is configured to, if the number of candidate relay terminals with the smallest sum of ranks is at least 2, compare the candidate relay terminals with the smallest sum of ranks with those in the terminal queue The candidate relay terminal with the farthest distance from the first terminal is regarded as the candidate relay terminal with the highest priority.

Preferably, the candidate information includes a candidate relay terminal determined by a remote terminal;

The processor is configured to determine from the remote terminal and the other remote terminals according to the relative position of the remote terminal in the terminal queue and the relative position of the other remote terminals in the terminal queue decision-making terminal; take the candidate relay terminal determined by the decision-making terminal as the finally determined relay terminal.

Preferably, the processor is configured to measure the SD-RSRP of the candidate relay terminal within a preset measurement time, and measure the SD-RSRP obtained by measurement in an order from large to small or from small to large Sort; determine the candidate relay terminal with the largest SD-RSRP as the candidate relay terminal determined by the remote terminal.

Preferably, the candidate relay terminal is a terminal in the terminal queue that meets the relay criterion and has sent a sounding reference signal within the preset measurement time.

Preferably, the processor is configured to use the terminal that is closest to the first terminal in the terminal queue among the remote terminal and the other remote terminals as the decision-making terminal.

Preferably, the terminal further includes:

a transceiver, configured to broadcast the relative position of the remote terminal in the terminal queue; and/or receive the relative position of the other remote terminal broadcasted by the other remote terminal in the terminal queue.

Preferably, the processor is further configured to establish a relay connection with the finally determined relay terminal if the remote terminal can establish a relay connection with the finally determined relay terminal; if the remote terminal can establish a relay connection with the finally determined relay terminal; It is impossible to establish a relay connection with the finally determined relay terminal, and execute the exclusion step, the reselection step and the connection step;

The exclusion step: determining that the finally determined relay terminal is not a candidate relay terminal corresponding to the remote terminal;

The reselection step: re-execute the first determining step, the measuring step, the receiving step and the second determining step to obtain a new and finally determined relay terminal;

The connection step: if a relay connection can be established with the new finalized relay terminal, a relay connection is established with the new finalized relay terminal; if the remote terminal cannot be connected with the new finalized relay terminal. The finally determined relay terminal establishes a relay connection, and repeats the exclusion step and the reselection step until a relay terminal that can be connected to the remote terminal is obtained, and the relay terminal that can be connected to the remote terminal is obtained. The relay terminal establishes a relay connection.

In a third aspect, the present invention also provides a terminal, including a memory, a processor, and a computer program stored on the memory and running on the processor; the processor implements the above-mentioned computer program when the processor executes the computer program. Method of choosing.

In a fourth aspect, the present invention further provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, implements the steps in the above selection method.

The beneficial effects of the above-mentioned technical solutions of the present invention are as follows:

In the embodiment of the present invention, the remote terminal broadcasts the candidate information, and then determines the finally determined relay terminal, and can select a suitable relay terminal for the remote terminal in combination with the specific application scenario, which not only ensures that the remote terminal receives data normally, and relays The number of terminals is also the least, which saves energy consumption and reduces the occupancy rate of air interface resources.

Description of drawings

Figure 1-2 is a schematic diagram of the fleet scene;

3 is a schematic flowchart of a method for selecting a relay terminal according to Embodiment 1 of the present invention;

FIG. 4 is a schematic structural diagram of a terminal according to Embodiment 2 of the present invention;

FIG. 5 is a schematic structural diagram of a terminal according to Embodiment 3 of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art fall within the protection scope of the present invention.

Please refer to FIG. 3. FIG. 3 is a schematic flowchart of a method for selecting a relay terminal according to Embodiment 1 of the present invention. The method is applied to a terminal and includes the following steps:

Step 31: The first determination step: if the terminal meets the selection criteria of the remote terminal, it is determined to be a remote terminal;

Step 32: measurement step: measure the candidate relay terminals in the terminal queue, and generate candidate information and broadcast it according to the measurement results;

Step 33: receiving step: receiving candidate information broadcast by other remote terminals in the terminal queue;

Step 34: the second determination step: obtaining the finally determined relay terminal according to the generated and received candidate information.

The selection method provided by the embodiment of the present invention can select an appropriate relay terminal for a remote terminal in combination with a specific application scenario, which not only ensures that the remote terminal receives data normally, but also has a minimum number of relay terminals and saves energy consumption. It can also reduce the occupancy rate of air interface resources.

In this embodiment of the present invention, there are various types of candidate information, which are described below with examples.

As a first optional specific implementation manner: the candidate information includes a ranking list, and the ranking list includes some or all of the measured candidate relay terminals.

That is, the Remote terminal measures the candidate relay terminals, sorts the measured candidate relay terminals, and broadcasts the sorted list (the sorted list may include some or all of the measured candidate relay terminals).

Preferably, the measuring step includes:

Within the preset measurement time, measure the SD-RSRP of the candidate relay terminal, and sort the measured SD-RSRPs in ascending order or from small to large;

The sorted list is generated according to the sorting result.

Specifically, within the preset measurement time, the Remote terminal sorts the measured SD-RSRPs of the candidate relay terminals in descending order or from small to large, and broadcasts the sorting results, such as broadcast sorting All candidate relay terminals after that, or some candidate relay terminals with the best broadcast signal.

As a second optional specific implementation manner: the candidate information includes the candidate relay terminal determined by the remote terminal.

Specifically, the Remote terminal measures the candidate relay terminals, sorts the measured candidate relay terminals, determines a candidate relay terminal from the measured candidate relay terminals according to the sorting result, and broadcasts it.

Preferably, the measuring step includes:

Within the preset measurement time, measure the SD-RSRP of the candidate relay terminal, and sort the SD-RSRP obtained by the measurement in ascending order or descending order;

It is determined that the candidate relay terminal with the largest SD-RSRP is the candidate relay terminal determined by the remote terminal.

Specifically, within the preset measurement time, the Remote terminal sorts the measured SD-RSRPs of the candidate relay terminals in ascending order or from small to large, and selects the best signal (that is, the SD-RSRP is the largest). The candidate relay terminal broadcasts it out.

The preset measurement time in the second embodiment may be equal to or unequal to the preset measurement time in the first embodiment, which is not limited in the present invention.

In this embodiment of the present invention, the candidate information may be the identifier of the candidate relay terminal.

Specifically, in the first specific implementation manner, the ranking list is a list of IDs of candidate relay terminals; in the second specific implementation manner, the candidate information is the IDs of the candidate relay terminals determined by the Remote terminal.

In the embodiment of the present invention, for different candidate information, the manners of obtaining the finally determined relay terminal are different, which will be described separately below.

For the first specific embodiment (that is, the candidate information includes a ranking list): the second determining step includes:

obtaining the candidate relay terminal that appears most frequently in the sorted list;

The finally determined relay terminal is obtained according to the candidate relay terminal with the largest number of occurrences.

Preferably, the step of obtaining the finally determined relay terminal according to the candidate relay terminal with the most occurrences includes:

If there is only one candidate relay terminal with the most occurrences, the candidate relay terminal with the most occurrences is used as the finally determined relay terminal;

If there are at least two candidate relay terminals with the most occurrences, sort at least two candidate relay terminals with the most occurrences, and use the candidate relay terminal with the highest priority as the final determined relay terminal.

For example, referring to Table 1.1, in a fleet, car 1 is the head of the car, cars 2, 3, and 4 are candidate relay terminals, cars 5, 6, and 7 are Remote terminals, and the sorted list broadcast by car 5 is 3, 4, The sorted list broadcast by car 6 is 2, 3, 4, and the sorted list broadcast by car 7 is 2, 3. In the sorting list, the order of candidate relay terminals is the descending order of SD-RSRP.

Table 1.1

Cars 2, 3, 4, 5, 6, and 7 are based on the sorted lists broadcasted by cars 5, 6, and 7, and the number of occurrences of car 3 in these three sorted lists is the most, which is 3 times, and car 3 is used as the final decision. relay terminal. Subsequently, vehicles 5, 6, and 7 establish relay connections with vehicle 3.

For another example, please refer to Table 1.2, in a fleet, car 1 is the front of the car, cars 2, 3, and 4 are candidate relay terminals, cars 5, 6, and 7 are Remote terminals, and the sorted list of car 5 broadcasts is 3, 4 , the sorted list broadcast by car 6 is 2, 4, and the sorted list broadcast by car 7 is 2, 3. In the sorting list, the order of candidate relay terminals is the descending order of SD-RSRP.

Table 1.2

Cars 2, 3, 4, 5, 6, and 7 are based on the sorted lists broadcasted by cars 5, 6, and 7, and the number of occurrences of car 2, car 3, and car 4 in the three sorted lists is the most, both of which are 2 times. , the vehicle 2, the vehicle 3, and the vehicle 4 can be sorted, and the candidate relay terminal with the highest priority among the vehicle 2, the vehicle 3, and the vehicle 4 can be used as the final determined relay terminal.

Further, the step of sorting at least two candidate relay terminals with the most occurrences, and using the candidate relay terminal with the highest priority as the finally determined relay terminal includes:

For each candidate relay terminal with the most occurrences, obtain the ranking of the candidate relay terminal with the most occurrence in each of the sorting lists, and calculate the sum of the rankings;

Arrange in ascending order of the sum of the rankings, and take the candidate relay terminal with the smallest sum of the rankings and the most frequent occurrences as the candidate relay terminal with the highest priority.

For example, referring to Table 1.3, in a fleet, car 1 is the head of the car, cars 2, 3, and 4 are candidate relay terminals, cars 5 and 6 are Remote terminals, and the sorted list broadcast by car 5 is 3, 4, and 2. The sorted list broadcast by car 6 is 3, 2. In the sorting list, the order of candidate relay terminals is the descending order of SD-RSRP.

Table 1.3

At this time, the number of times Car 2 and Car 3 appear in the three sorted lists are the most, both are 2 times. For Car 2 and Car 3, respectively, calculate the rank of Car 2 and Car 3 in the two sorted lists. Sum:

The sum of the 2nd place of the car = 3 + 2 = 5;

The sum of the 3 places of the car = 1 + 1 = 2;

The sum of the ranks of the car 3 is the smallest, and the car 3 is regarded as the candidate relay terminal with the highest priority, that is, the car 2, 3, 4, 5, and 6 obtain the car 3 according to the sorted list broadcast by the car 5 and 6 as the final determination. relay terminal. Subsequently, vehicles 5 and 6 establish relay connections with vehicle 3.

Optionally, the step of using the candidate relay terminal with the smallest sum of rankings as the candidate relay terminal with the highest priority includes:

If the number of candidate relay terminals with the smallest sum of rankings is at least 2, the candidate relay terminals with the smallest sum of rankings and the candidate with the farthest distance from the first terminal in the terminal queue are selected. The relay terminal is used as the candidate relay terminal with the highest priority.

In the embodiment of the present invention, when the terminal queue is a convoy, the first terminal is preferably the front of the vehicle.

For example, referring to Table 1.4, in a fleet, car 1 is the head of the car, cars 2, 3, and 4 are candidate relay terminals, cars 5 and 6 are Remote terminals, and the sorted list broadcast by car 5 is 3, 4, and 2. The sorted list broadcast by car 6 is 4, 3, 2. In the sorting list, the order of candidate relay terminals is the descending order of SD-RSRP.

Table 1.4

At this time, car 2, car 3, and car 4 appear the most times in the three sorted lists, all of which are 2 times. Sum of rank in these 2 sorted lists:

The sum of the 2nd place of the car = 3 + 3 = 6;

The sum of the 3 places of the car = 1 + 2 = 3;

The sum of the 4 digits of the car = 2 + 1 = 3;

The sum of the ranks of car 3 and car 4 is tied for the smallest, and the candidate relay terminal (ie car 4) that is farthest from the first terminal (ie, car front: car 1) is selected from the car 3 and car 4 as the highest priority. The candidate relay terminals, that is, vehicles 2, 3, 4, 5, and 6, obtain vehicle 4 as the finalized relay terminal according to the sorted list broadcasted by vehicles 5 and 6. Subsequently, vehicles 5 and 6 establish relay connections with vehicle 4.

For the second specific embodiment (that is, the candidate information includes the candidate relay terminal determined by the remote terminal): the second determining step includes:

determining a decision-making terminal from the remote terminal and the other remote terminals according to the relative position of the remote terminal in the terminal queue and the relative position of the other remote terminals in the terminal queue;

The candidate relay terminal determined by the decision terminal is used as the finally determined relay terminal.

That is to say, according to the relative position of the remote terminal in the terminal queue, a decision terminal is determined from the remote terminals as the "temporary leader", and the candidate relay terminal recommended by the temporary leader is used as the finalized relay terminal.

Preferably, the decision-making terminal is determined from the remote terminal and the other remote terminals according to the relative position of the remote terminal in the terminal queue and the relative position of the other remote terminals in the terminal queue The steps include:

The terminal that is closest to the first terminal in the terminal queue among the remote terminal and the other remote terminals is used as the decision terminal.

For example, there is at least one remote terminal in a fleet, and the remote terminal closest to the front of the vehicle is selected as the decision-making terminal.

In a specific application scenario, please refer to Table 2.1. In a fleet, car 1 is the front of the car, cars 2, 3, and 4 are candidate relay terminals, cars 5 and 6 are Remote terminals, and the candidate information broadcast by car 5 is the car. The ID of the candidate relay terminal determined by 5 is 3, and the candidate information broadcast by car 6 is that the ID of the candidate relay terminal determined by car 6 is 4.

Table 2.1

Vehicles 5 and 6 select the remote vehicle (ie, vehicle 5) closest to the front of the vehicle as the decision-making terminal according to their positions in the fleet. The determined candidate relay terminal (ie, car 3 ) is used as the final determined relay terminal. Subsequently, vehicles 5 and 6 establish relay connections with vehicle 3.

Preferably, before the second determining step, it further includes:

broadcast the relative position of the remote terminal in the terminal queue; and/or

The relative position of the other remote terminal in the terminal queue that receives the broadcast of the other remote terminal.

That is, the remote terminal broadcasts its own relative position in the terminal queue, and/or the relative positions of other remote terminals in the terminal queue that receive broadcasts from other remote terminals.

Of course, if all the terminals in the terminal queue know the relative positions of each other in the terminal queue, there is no need to repeatedly broadcast the positions.

In some preferred embodiments of the present invention, after the finally determined relay terminal is determined, the finally determined relay terminal sends a relay announcement (Discovery Announcement) signal, and the Remote terminal receives the relay announcement signal and no longer performs relay selection. , and establish a relay connection with the finally determined relay terminal.

Specifically, after the finally determined relay terminal is determined, the Remote terminal sends the ID of the finally determined relay terminal, and the candidate relay terminal determines whether it is the finally determined relay terminal according to the ID sent by the Remote terminal, and if so, Then send a relay announcement signal, all remote terminals that receive the relay announcement signal consider that the finalized relay terminal has the highest priority, no longer perform relay selection, and directly establish a relay with the finalized relay terminal connect.

In some preferred embodiments of the present invention, after the second determining step, the method further includes:

If the remote terminal can establish a relay connection with the finally determined relay terminal, establish a relay connection with the finally determined relay terminal;

If the remote terminal cannot establish a relay connection with the finally determined relay terminal, perform the elimination step, the reselection step and the connection step;

The exclusion step: determining that the finally determined relay terminal is not a candidate relay terminal corresponding to the remote terminal;

The reselection step: re-execute the first determining step, the measuring step, the receiving step and the second determining step to obtain a new and finally determined relay terminal;

The connection step: if a relay connection can be established with the new finalized relay terminal, a relay connection is established with the new finalized relay terminal; if the remote terminal cannot be connected with the new finalized relay terminal. The finally determined relay terminal establishes a relay connection, and repeats the exclusion step and the reselection step until a relay terminal that can be connected to the remote terminal is obtained, and the relay terminal that can be connected to the remote terminal is obtained. The relay terminal establishes a relay connection.

That is to say, after the finalized relay terminal is determined, all Remote terminals are connected to the finalized relay terminal one by one. If the relay terminal is not a candidate relay terminal corresponding to the Remote terminal, the relay selection is performed again until all Remote terminals establish connections with the relay terminal.

Still taking Table 2.1 as an example, car 3 is the finalized relay terminal, car 5 can establish a relay connection with car 3, and car 6 cannot establish a relay connection with car 3, then it is determined that car 3 is not a candidate corresponding to car 6 The relay terminal selects the candidate relay terminal corresponding to the vehicle 6 from the vehicles 2 and 4 again, until the vehicle 6 successfully establishes a relay connection with the newly finalized relay terminal.

Preferably, for the second specific implementation manner, after the relay connection is established with the finally determined relay terminal, the identity of the decision terminal becomes invalid. That is to say, each time a complete relay selection and connection process is performed, the identity of the decision-making terminal becomes invalid, and the decision-making terminal is re-determined in the next relay selection process.

In this embodiment of the present invention, the selection criterion of the remote terminal may be that the received SD-RSRP of the first terminal is less than or equal to the first preset power threshold; it may also be that the received SD-RSRP of the first terminal is less than or equal to the first Two preset power thresholds, and the received SD-RSRP of the original relay terminal is less than or equal to the third preset power threshold.

Specifically, if there is an original relay terminal in the terminal queue, the remote terminal is a terminal that cannot receive the signals of the first terminal and the original relay terminal in the terminal queue. If the signal from the front of the car and the signal from the original relay car cannot be received, it is a remote car; or, the remote terminal is a terminal that receives weak signals from the first terminal and the original relay terminal. : In a team, although the car at the rear of the car can receive the signal from the front of the car and the signal of the original relay car, but the signal is very weak, that is, the remote car.

If there is no original relay terminal in the terminal queue, the remote terminal is the terminal that cannot receive the signal of the first terminal in the terminal queue. It is a remote car; or, the remote terminal is a terminal that receives a very weak signal from the first terminal, for example: in a fleet, although the car at the rear of the car can receive the signal from the front of the car, but the signal is very weak, that is, a remote car .

In the embodiment of the present invention, the candidate relay terminal is a terminal in the terminal queue that meets the relay criterion and has sent a Discovery Reference Signal (DRS) within the preset measurement time.

The relay criterion may be that the received SD-RSRP of the terminals in the terminal queue is greater than or equal to the fourth preset power threshold.

In this embodiment of the present invention, candidate information broadcast by other remote terminals in the terminal queue may be received within a preset transceiving period. For the first specific implementation manner (that is, the candidate information includes a sorted list) and the second specific implementation manner (that is, the candidate information includes the candidate relay terminal determined by the remote terminal), the preset transceiving period may be the same or different, and the preset transceiving period may be equal to or unequal to the preset measurement time, which is not limited in the present invention.

Please refer to FIG. 4. FIG. 4 is a schematic structural diagram of a terminal according to Embodiment 2 of the present invention. The terminal 40 includes:

a processor 41, configured to perform the first determining step, the measuring step, the receiving step and the second determining step;

The first determination step: if the terminal complies with the selection criteria of the remote terminal, it is determined to be a remote terminal;

The measurement step: measure the candidate relay terminals in the terminal queue, and generate candidate information and broadcast it according to the measurement result;

The receiving step: receiving candidate information broadcast by other remote terminals in the terminal queue;

The second determining step: obtaining the finally determined relay terminal according to the generated and received candidate information.

The terminal provided by the embodiment of the present invention can select an appropriate relay terminal for the remote terminal in combination with a specific application scenario, which not only ensures that the remote terminal receives data normally, but also has a minimum number of relay terminals, saves energy consumption, and also saves energy. It can reduce the occupancy rate of air interface resources.

Preferably, the candidate information includes a ranking list, and the ranking list includes some or all of the measured candidate relay terminals;

The processor 41 is configured to measure the pass-through mode reference signal received power SD-RSRP of the candidate relay terminal within a preset measurement time, and measure the SD-RSRP obtained by measurement in ascending order or descending order. Sorting is performed in the largest order; according to the sorting result, the sorting list is generated.

Preferably, the processor 41 is configured to acquire the candidate relay terminal that appears the most times in the sorted list; and obtain the finally determined relay terminal according to the candidate relay terminal that appears the most times.

Preferably, the processor 41 is configured to, if there is only one candidate relay terminal with the most occurrences, take the candidate relay terminal with the most occurrences as the finally determined relay terminal; if the There are at least two candidate relay terminals with the most occurrences, and the at least two candidate relay terminals with the most occurrences are sorted, and the candidate relay terminal with the highest priority is used as the finally determined relay terminal.

Preferably, in the sorting list, the order of the candidate relay terminals is the order of SD-RSRP from large to small;

The processor 41 is configured to, for each candidate relay terminal with the most occurrences, obtain the rank of the candidate relay terminal with the most appearance in each of the sorting lists, and calculate the rank. Sum: Arrange in ascending order of the sum of rank, and take the candidate relay terminal with the smallest sum of rank and the largest number of occurrences as the candidate relay terminal with the highest priority.

Preferably, the processor 41 is configured to, if the number of candidate relay terminals with the smallest sum of rankings is at least 2, compare the candidate relay terminals with the smallest sum of rankings with the terminal queue The candidate relay terminal with the farthest distance from the first terminal in , is regarded as the candidate relay terminal with the highest priority.

Preferably, the candidate information includes a candidate relay terminal determined by a remote terminal;

The processor 41 is configured to, according to the relative position of the remote terminal in the terminal queue and the relative position of the other remote terminals in the terminal queue, select from the remote terminal and the other remote terminals. Determine the decision-making terminal; take the candidate relay terminal determined by the decision-making terminal as the finally determined relay terminal.

Preferably, the processor 41 is configured to measure the SD-RSRP of the candidate relay terminal within a preset measurement time, and measure the SD-RSRP obtained by the measurement in an order from large to small or from small to large Perform sorting; determine the candidate relay terminal with the largest SD-RSRP as the candidate relay terminal determined by the remote terminal.

Preferably, the candidate relay terminal is a terminal in the terminal queue that meets the relay criterion and has sent a sounding reference signal within the preset measurement time.

Preferably, the processor 41 is configured to use the terminal that is closest to the first terminal in the terminal queue among the remote terminal and the other remote terminals as the decision-making terminal.

Preferably, the terminal 40 further includes:

a transceiver, configured to broadcast the relative position of the remote terminal in the terminal queue; and/or receive the relative position of the other remote terminal broadcasted by the other remote terminal in the terminal queue.

Preferably, the processor 41 is further configured to establish a relay connection with the finally determined relay terminal if the remote terminal can establish a relay connection with the finally determined relay terminal; The terminal cannot establish a relay connection with the finally determined relay terminal, and performs the elimination step, the reselection step and the connection step;

The exclusion step: determining that the finally determined relay terminal is not a candidate relay terminal corresponding to the remote terminal;

The reselection step: re-execute the first determining step, the measuring step, the receiving step and the second determining step to obtain a new and finally determined relay terminal;

The connection step: if a relay connection can be established with the new finalized relay terminal, a relay connection is established with the new finalized relay terminal; if the remote terminal cannot be connected with the new finalized relay terminal. The finally determined relay terminal establishes a relay connection, and repeats the exclusion step and the reselection step until a relay terminal that can be connected to the remote terminal is obtained, and the relay terminal that can be connected to the remote terminal is obtained. The relay terminal establishes a relay connection.

The specific working process of the second embodiment of the present invention is the same as that in the above-mentioned corresponding embodiment 1, so it is not repeated here. For details, please refer to the description in the above-mentioned corresponding embodiment.

Please refer to FIG. 5. FIG. 5 is a schematic structural diagram of a terminal according to Embodiment 3 of the present invention. The terminal 50 includes a processor 51, a memory 52, and a computer program stored on the memory 52 and running on the processor 51. ; The processor 51 realizes the following steps when executing the computer program:

The first determination step: if the terminal meets the selection criteria of the remote terminal, it is determined to become a remote terminal;

Measurement step: measure the candidate relay terminals in the terminal queue, generate candidate information and broadcast it according to the measurement results;

Receiving step: receiving candidate information broadcast by other remote terminals in the terminal queue;

The second determination step: obtaining a finally determined relay terminal according to the generated and received candidate information.

The terminal provided by the embodiment of the present invention can select an appropriate relay terminal for the remote terminal in combination with a specific application scenario, which not only ensures that the remote terminal receives data normally, but also has a minimum number of relay terminals, saves energy consumption, and also saves energy. It can reduce the occupancy rate of air interface resources.

Preferably, the candidate information includes a ranking list, and the ranking list includes some or all of the measured candidate relay terminals;

When the processor 51 executes the computer program, the following steps are implemented:

The measuring steps include:

Within a preset measurement time, measure the pass-through mode reference signal received power SD-RSRP of the candidate relay terminal, and sort the measured SD-RSRP in ascending order or descending order;

The sorted list is generated according to the sorting result.

Preferably, the processor 51 implements the following steps when executing the computer program:

The second determining step includes:

obtaining the candidate relay terminal that appears most frequently in the sorted list;

The finally determined relay terminal is obtained according to the candidate relay terminal with the largest number of occurrences.

Preferably, the processor 51 implements the following steps when executing the computer program:

The step of obtaining the finally determined relay terminal according to the candidate relay terminal with the most occurrences includes:

If there is only one candidate relay terminal with the most occurrences, the candidate relay terminal with the most occurrences is used as the finally determined relay terminal;

If there are at least two candidate relay terminals with the most occurrences, sort at least two candidate relay terminals with the most occurrences, and use the candidate relay terminal with the highest priority as the final determined relay terminal.

Preferably, in the sorting list, the order of the candidate relay terminals is the order of SD-RSRP from large to small;

When the processor 51 executes the computer program, the following steps are implemented:

The step of sorting at least two candidate relay terminals with the most occurrences, and using the candidate relay terminal with the highest priority as the finally determined relay terminal includes:

For each candidate relay terminal with the most occurrences, obtain the ranking of the candidate relay terminal with the most occurrence in each of the sorting lists, and calculate the sum of the rankings;

Arrange in ascending order of the sum of the rankings, and take the candidate relay terminal with the smallest sum of the rankings and the most frequent occurrences as the candidate relay terminal with the highest priority.

Preferably, the processor 51 implements the following steps when executing the computer program:

The step of using the candidate relay terminal with the smallest sum of rankings as the candidate relay terminal with the highest priority includes:

If the number of candidate relay terminals with the smallest sum of rankings is at least 2, the candidate relay terminals with the smallest sum of rankings and the candidate with the farthest distance from the first terminal in the terminal queue are selected. The relay terminal is used as the candidate relay terminal with the highest priority.

Preferably, the candidate information includes a candidate relay terminal determined by a remote terminal;

When the processor 51 executes the computer program, the following steps are implemented:

The second determining step includes:

determining a decision-making terminal from the remote terminal and the other remote terminals according to the relative position of the remote terminal in the terminal queue and the relative position of the other remote terminals in the terminal queue;

The candidate relay terminal determined by the decision terminal is used as the finally determined relay terminal.

Preferably, the processor 51 implements the following steps when executing the computer program:

The measuring steps include:

Within the preset measurement time, measure the SD-RSRP of the candidate relay terminal, and sort the SD-RSRP obtained by the measurement in ascending order or descending order;

It is determined that the candidate relay terminal with the largest SD-RSRP is the candidate relay terminal determined by the remote terminal.

Preferably, the candidate relay terminal is a terminal in the terminal queue that meets the relay criterion and has sent a sounding reference signal within the preset measurement time.

Preferably, the processor 51 implements the following steps when executing the computer program:

The step of determining a decision terminal from the remote terminal and the other remote terminals according to the relative position of the remote terminal in the terminal queue and the relative position of the other remote terminals in the terminal queue includes: :

The terminal that is closest to the first terminal in the terminal queue among the remote terminal and the other remote terminals is used as the decision terminal.

Preferably, the processor 51 implements the following steps when executing the computer program:

Before the second determining step, it also includes:

broadcast the relative position of the remote terminal in the terminal queue; and/or

The relative position of the other remote terminal in the terminal queue that receives the broadcast of the other remote terminal.

Preferably, the processor 51 implements the following steps when executing the computer program:

After the second determining step, it also includes:

If the remote terminal can establish a relay connection with the finally determined relay terminal, establish a relay connection with the finally determined relay terminal;

If the remote terminal cannot establish a relay connection with the finally determined relay terminal, perform the elimination step, the reselection step and the connection step;

The exclusion step: determining that the finally determined relay terminal is not a candidate relay terminal corresponding to the remote terminal;

The reselection step: re-execute the first determining step, the measuring step, the receiving step and the second determining step to obtain a new and finally determined relay terminal;

The connection step: if a relay connection can be established with the new finalized relay terminal, a relay connection is established with the new finalized relay terminal; if the remote terminal cannot be connected with the new finalized relay terminal. The finally determined relay terminal establishes a relay connection, and repeats the exclusion step and the reselection step until a relay terminal that can be connected to the remote terminal is obtained, and the relay terminal that can be connected to the remote terminal is obtained. The relay terminal establishes a relay connection.

The specific working process of the third embodiment of the present invention is the same as that in the above-mentioned corresponding embodiment 1, so it is not repeated here. For details, please refer to the description of the method steps in the above-mentioned corresponding embodiment.

Embodiment 4 of the present invention provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, implements the steps in the selection method in the above-mentioned first embodiment. The specific working process is the same as that in the above-mentioned corresponding embodiment 1, so it is not repeated here. For details, please refer to the description of the method steps in the above-mentioned corresponding embodiment.

The network side device in this embodiment of the present invention may be a base station (Base Transceiver Station, BTS for short) in Global System of Mobile communication (GSM for short) or Code Division Multiple Access (CDMA for short), or It can be a base station (NodeB, NB for short) in Wideband Code Division Multiple Access (WCDMA for short), an evolved base station (Evolutional Node B, eNB or eNodeB for short) in LTE, or a relay station or an access point. The entry point, or the base station in the future 5G network, etc., is not limited here.

The terminal in this embodiment of the present invention may be a wireless terminal or a wired terminal, and the wireless terminal may be a device that provides voice and/or other service data connectivity to a user, a handheld device with a wireless connection function, or a wireless modem connected to other processing equipment. A wireless terminal can communicate with one or more core networks via a Radio Access Network (RAN), and the wireless terminal can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a mobile phone Computers, for example, may be portable, pocket-sized, hand-held, computer-built-in or vehicle-mounted mobile devices that exchange language and/or data with the wireless access network. For example, a Personal Communication Service (PCS) phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (Personal Digital Assistant) Assistant, referred to as PDA) and other devices. A wireless terminal may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, an access A terminal (Access Terminal), a user terminal (User Terminal), a user agent (User Agent), and a terminal (UserDevice or User Equipment) are not limited here.

The aforementioned computer readable media includes both persistent and non-permanent, removable and non-removable media and can be implemented by any method or technology for information storage. Information may be computer readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), Flash Memory or other memory technology, Compact Disc Read Only Memory (CD-ROM), Digital Versatile Disc (DVD) or other optical storage, Magnetic tape cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission medium that can be used to store information that can be accessed by a computing device.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (24)

1. A method for selecting a relay terminal is applied to a terminal, and is characterized by comprising the following steps:

a first determination step: if the terminal meets the selection criteria of the remote terminal, determining to become the remote terminal; the selection criterion of the remote terminal is that the received SD-RSRP of the first terminal is less than or equal to a first preset power threshold; or the received SD-RSRP of the first terminal is less than or equal to a second preset power threshold, and the received SD-RSRP of the original relay terminal is less than or equal to a third preset power threshold;

a measurement step: measuring candidate relay terminals in the terminal queue, generating candidate information according to the measurement result and broadcasting the candidate information; the candidate information comprises candidate relay terminals determined by the remote terminal;

a receiving step: receiving candidate information broadcasted by other remote terminals in the terminal queue;

a second determination step: obtaining a finally determined relay terminal according to the generated and received candidate information, wherein the method comprises the following steps: determining a decision terminal from the remote terminal and the other remote terminals according to the relative position of the remote terminal in the terminal queue and the relative positions of the other remote terminals in the terminal queue; and taking the candidate relay terminal determined by the decision terminal as the finally determined relay terminal.

2. Selection method according to claim 1,

the candidate information comprises an ordered list comprising part or all of the measured candidate relay terminals;

the measuring step includes:

within preset measurement time, measuring the direct mode reference signal received power (SD-RSRP) of the candidate relay terminal, and sequencing the SD-RSRP obtained by measurement from large to small or from small to large;

and generating the ordered list according to the ordering result.

3. Selection method according to claim 2, characterized in that said second determination step comprises:

acquiring the candidate relay terminal with the largest occurrence frequency in the ordered list;

and obtaining the finally determined relay terminal according to the candidate relay terminal with the largest occurrence frequency.

4. Selection method according to claim 3,

the step of obtaining the finally determined relay terminal according to the candidate relay terminal with the largest occurrence number comprises:

if the number of the candidate relay terminals with the largest occurrence number is only 1, taking the candidate relay terminal with the largest occurrence number as the finally determined relay terminal;

if at least 2 candidate relay terminals with the largest occurrence number exist, sequencing at least 2 candidate relay terminals with the largest occurrence number, and taking the candidate relay terminal with the highest priority as the finally determined relay terminal.

5. Selection method according to claim 4,

in the ordered list, the sequence of the candidate relay terminals is the sequence from SD-RSRP to small;

the step of ranking at least 2 of the candidate relay terminals with the largest occurrence number and using the candidate relay terminal with the highest priority as the finally determined relay terminal includes:

for each candidate relay terminal with the largest occurrence number, acquiring the rank of the candidate relay terminal with the largest occurrence number in each ordered list, and calculating the sum of the ranks;

and arranging the candidate relay terminals with the smallest sum of the orders from small to large, and taking the candidate relay terminal with the largest occurrence number with the smallest sum of the orders as the candidate relay terminal with the highest priority.

6. The selection method according to claim 5, wherein the step of using the candidate relay terminal with the smallest sum of the orders as the candidate relay terminal with the highest priority comprises:

and if the number of the candidate relay terminals with the minimum sum of the orders is at least 2, taking the candidate relay terminal which is farthest away from the first terminal in the terminal queue in the candidate relay terminals with the minimum sum of the orders as the candidate relay terminal with the highest priority.

7. Selection method according to claim 1, characterized in that said measuring step comprises:

within preset measurement time, measuring the SD-RSRP of the candidate relay terminal, and sequencing the SD-RSRP obtained by measurement from large to small or from small to large;

and determining the candidate relay terminal with the maximum SD-RSRP as the candidate relay terminal determined by the remote terminal.

8. The selection method according to claim 2 or 7, wherein the candidate relay terminal is a terminal that meets relay criteria in the terminal queue and has sent a sounding reference signal within the preset measurement time; and the relay criterion is that the received SD-RSRP of the terminal in the terminal queue is greater than or equal to a fourth preset power threshold.

9. Selection method according to claim 1, wherein the step of determining a decision terminal from the remote terminal and the other remote terminals based on the relative position of the remote terminal in the terminal queue and the relative positions of the other remote terminals in the terminal queue comprises:

and taking the terminal which is closest to the first terminal in the terminal queue in the remote terminal and the other remote terminals as the decision terminal.

10. The selection method according to claim 1, wherein the second determination step is preceded by:

broadcasting the relative position of the remote terminal in the terminal queue; and/or

Receiving the relative position of the other remote terminal in the terminal queue broadcasted by the other remote terminal.

11. The selection method according to claim 1, wherein after the second determination step, further comprising:

if the remote terminal can establish relay connection with the finally determined relay terminal, establishing relay connection with the finally determined relay terminal;

if the remote terminal can not establish relay connection with the finally determined relay terminal, executing an excluding step, a reselecting step and a connecting step;

the elimination step: determining that the finally determined relay terminal is not a candidate relay terminal corresponding to the remote terminal;

the reselection step: re-executing the first determining step, the measuring step, the receiving step and the second determining step to obtain a new finally determined relay terminal;

the connection step comprises: if the relay connection can be established with the new finally determined relay terminal, establishing the relay connection with the new finally determined relay terminal; and if the remote terminal cannot establish relay connection with the new finally determined relay terminal, repeatedly executing the elimination step and the reselection step until a relay terminal capable of being connected with the remote terminal is obtained, and establishing relay connection with the relay terminal capable of being connected with the remote terminal.

12. A terminal, comprising:

a processor for performing the first determining step, the measuring step, the receiving step, and the second determining step;

the first determining step: if the terminal meets the selection criteria of the remote terminal, determining to become the remote terminal; the selection criterion of the remote terminal is that the received SD-RSRP of the first terminal is less than or equal to a first preset power threshold; or the received SD-RSRP of the first terminal is less than or equal to a second preset power threshold, and the received SD-RSRP of the original relay terminal is less than or equal to a third preset power threshold;

the measuring step comprises: measuring candidate relay terminals in the terminal queue, generating candidate information according to the measurement result and broadcasting the candidate information; the candidate information comprises candidate relay terminals determined by the remote terminal;

the receiving step comprises: receiving candidate information broadcasted by other remote terminals in the terminal queue;

the second determining step: obtaining a finally determined relay terminal according to the generated and received candidate information;

the processor is used for determining a decision terminal from the remote terminal and the other remote terminals according to the relative position of the remote terminal in the terminal queue and the relative positions of the other remote terminals in the terminal queue; and taking the candidate relay terminal determined by the decision terminal as the finally determined relay terminal.

13. The terminal of claim 12,

the candidate information comprises an ordered list comprising part or all of the measured candidate relay terminals;

the processor is configured to measure a direct mode reference signal received power (SD-RSRP) of the candidate relay terminal within a preset measurement time, and sort the SD-RSRP obtained through measurement in a descending order or a descending order; and generating the ordered list according to the ordering result.

14. The terminal of claim 13,

the processor is configured to acquire a candidate relay terminal that appears most frequently in the ordered list; and obtaining the finally determined relay terminal according to the candidate relay terminal with the largest occurrence frequency.

15. The terminal of claim 14,

the processor is configured to, if only 1 candidate relay terminal with the largest occurrence number is available, take the candidate relay terminal with the largest occurrence number as the finally determined relay terminal; if at least 2 candidate relay terminals with the largest occurrence number exist, sequencing at least 2 candidate relay terminals with the largest occurrence number, and taking the candidate relay terminal with the highest priority as the finally determined relay terminal.

16. The terminal of claim 15,

in the ordered list, the sequence of the candidate relay terminals is the sequence from SD-RSRP to small;

the processor is configured to, for each candidate relay terminal with the largest occurrence number, obtain the rank of the candidate relay terminal with the largest occurrence number in each ordered list, and calculate a sum of the ranks; and arranging the candidate relay terminals with the smallest sum of the orders from small to large, and taking the candidate relay terminal with the largest occurrence number with the smallest sum of the orders as the candidate relay terminal with the highest priority.

17. The terminal of claim 16,

and the processor is configured to, if the number of the candidate relay terminals with the smallest sum of the ranks is at least 2, take the candidate relay terminal that is farthest away from the first terminal in the terminal queue among the candidate relay terminals with the smallest sum of the ranks as the candidate relay terminal with the highest priority.

18. The terminal of claim 12,

the processor is configured to measure the SD-RSRP of the candidate relay terminal within a preset measurement time, and sort the measured SD-RSRP in descending order or descending order; and determining the candidate relay terminal with the maximum SD-RSRP as the candidate relay terminal determined by the remote terminal.

19. The terminal according to claim 13 or claim 18, wherein the candidate relay terminal is a terminal that meets relay criteria in the terminal queue and has sent a sounding reference signal within the preset measurement time; and the relay criterion is that the received SD-RSRP of the terminal in the terminal queue is greater than or equal to a fourth preset power threshold.

20. The terminal of claim 12,

and the processor is configured to use a terminal, which is closest to the first terminal in the terminal queue, of the remote terminal and the other remote terminals as the decision terminal.

21. The terminal of claim 12, further comprising:

a transceiver for broadcasting the relative position of the remote terminal in the terminal queue; and/or receiving the relative position of the other remote terminals in the terminal queue broadcasted by the other remote terminals.

22. The terminal of claim 12,

the processor is further configured to establish a relay connection with the finally determined relay terminal if the remote terminal is capable of establishing a relay connection with the finally determined relay terminal; if the remote terminal can not establish relay connection with the finally determined relay terminal, executing an excluding step, a reselecting step and a connecting step;

the elimination step: determining that the finally determined relay terminal is not a candidate relay terminal corresponding to the remote terminal;

the reselection step: re-executing the first determining step, the measuring step, the receiving step and the second determining step to obtain a new finally determined relay terminal;

the connection step comprises: if the relay connection can be established with the new finally determined relay terminal, establishing the relay connection with the new finally determined relay terminal; and if the remote terminal cannot establish relay connection with the new finally determined relay terminal, repeatedly executing the elimination step and the reselection step until a relay terminal capable of being connected with the remote terminal is obtained, and establishing relay connection with the relay terminal capable of being connected with the remote terminal.

23. A terminal comprising a memory, a processor and a computer program stored on the memory and executable on the processor; characterized in that the processor, when executing the computer program, implements the selection method of any one of claims 1 to 11.

24. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the selection method according to any one of claims 1 to 11.

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