Granted Patent B2

US 12,634,798 · App. 18/271,228 · Granted May 19, 2026

Inventor: Xing Yang (Beijing, CN)

Assignee: BEIJING XIAOMI MOBILE SOFTWARE CO., LTD.

H04W40/22H04W88/04

Abstract

Claims (94)

1 . A method for selecting a relay user equipment (UE), performed by a first UE, comprising:

selecting, according to load information of candidate UEs, a relay UE from the candidate UEs;

wherein the load information is determined by the candidate UE based on measurement result of sidelink communication (SL) and load indication information;

wherein the measurement result of the SL is obtained by the candidate UE by measuring a transmission link, and the measurement result of the SL comprises at least one of a channel busy ratio (CBR) of the SL or a channel occupancy ratio (CR) of the SL; and

wherein the load indication information is sent by a base station to the candidate UE, and the load indication information is configured to indicate a load status of a cellular communication link between the candidate UE and the base station;

wherein selecting, according to the load information of the candidate UEs, the relay UE from the candidate UEs comprises:

selecting, according to the load information of the candidate UEs, the relay UE from the candidate UEs whose load status meets a requirement,

wherein the load status meeting the requirement comprises at least one of:

an overload indication, indicating that the candidate UE is not overloaded;

a load level, indicating that a level of a load of the candidate UE is lower than a first threshold; or

a load rate, indicating that a load rate of the candidate UE is lower than a second threshold; and

determining that there are at least two candidate UEs whose load status meets the requirement, and selecting a candidate UE with a lowest load level or a lowest load rate as the relay UE.

2 . The method according to claim 1 , further comprising:

receiving the load information sent by the candidate UEs.

3 . The method according to claim 2 , wherein receiving the load information sent by the candidate UEs comprises at least one of following acts:

receiving the load information broadcast by the candidate UEs; or,

receiving the load information unicast by the candidate UEs through a dedicated signaling.

4 . The method according to claim 1 , wherein the load information comprises at least one of the following:

the overload indication, indicating whether the candidate UE is overloaded;

the load level, indicating the level of the load of the candidate UE; or

the load rate.

5 . The method according to claim 1 , wherein selecting, according to the load information of the candidate UEs, the relay UE from the candidate UEs whose load status meet the requirement comprises:

selecting, according to the load information of the candidate UEs, a third UE whose load status meets the requirement as the relay UE.

6 . The method according to claim 1 , wherein the selecting, according to the load information of the candidate UEs, the relay UE from the candidate UEs whose load status meet the requirement comprises:

selecting, in response to determining that there are at least two candidate UEs whose load status differences are within a preset range and all the load status of the at least two candidate UEs meet the requirement, according to a selection strategy, at least one candidate UE from at least two candidate UEs whose load status meet the requirement and are identical, as the relay UE.

7 . The method according to claim 6 , wherein selecting, according to the selection strategy, the at least one candidate UE from the at least two candidate UEs whose load status meet the requirement and are identical as the relay UE comprises one of following acts:

selecting, based on the selection strategy, according to a channel quality of the SL between the first UE and the candidate UE, a candidate UE with a best channel quality from the at least two candidate UEs whose load status meet the requirement and are identical, as the relay UE;

selecting, based on the selection strategy, according to a channel quality of a cellular communication link between the base station and the candidate UE, a candidate UE with a best channel quality from the at least two candidate UEs whose load status meet the requirement and are identical, as the relay UE;

selecting, based on the selection strategy, according to a channel quality of a cellular communication link between the base station and the candidate UE and according to a distance between the candidate UE and the first UE, a candidate UE with a closest distance from the at least two candidate UEs whose load status meet the requirement and are identical, as the relay UE; or

based on the selection strategy, selecting a candidate UE with a best channel quality from the at least two candidate UEs whose load status meet the requirement and are identical as the relay UE.

8 . The method according to claim 6 , wherein the load information comprises: the load level, the method further comprises:

determining, according to the load level and the first threshold, whether the load status of the candidate UE meets the requirement for being the relay UE;

or,

wherein the load information comprises: the load rate; the method further comprises:

determining, according to the load rate and the second threshold, whether the load status of the candidate UE meets the requirement for being the relay UE.

9 . The method according to claim 1 , further comprising:

receiving threshold information delivered by the base station;

or,

determining, according to a preset configuration, threshold information;

wherein the threshold information is used to determine whether the load status of the candidate UE meets the requirement for being the relay UE.

10 . The method according to claim 1 , further comprising:

determining, according to a channel measurement result of the SL, the candidate UE.

11 . The method according to claim 10 , wherein determining, according to the channel measurement result of the SL, the candidate UE comprises:

determining, according to the channel measurement result of the SL, any UE which makes the SL with the first UE with a channel quality greater than a quality threshold, as the candidate UE.

12 . A communication device comprising a processor, a transceiver, a memory, and an executable program stored in the memory and capable of running on the processor, wherein the processor is configured to

select, according to load information of candidate UEs, a relay UE from the candidate UEs;

wherein the load information is determined by the candidate UE based on a measurement result of sidelink communication (SL) and load indication information;

wherein the measurement result of the SL is obtained by the candidate UE by measuring a transmission link, and the measurement result of the SL comprises at least one of a channel busy ratio (CBR) of the SL or a channel occupancy ratio (CR) of the SL; and

wherein the load indication information is sent by a base station to the candidate UE, and the load indication information is configured to indicate a load status of a cellular communication link between the candidate UE and the base station;

wherein the processor is further configured to:

select, according to the load information of the candidate UEs, the relay UE from the candidate UEs whose load status meets a requirement,

wherein the load status meeting the requirement comprises at least one of:

an overload indication, indicating that the candidate UE is not overloaded;

a load level, indicating that a level of a load of the candidate UE is lower than a first threshold; or

a load rate, indicating that a load rate of the candidate UE is lower than a second threshold; and

determine that there are at least two candidate UEs whose load status meets the requirement, and select a candidate UE with a lowest load level or a lowest load rate as the relay UE.

13 . The communication device according to claim 12 , wherein the processor is further configured to:

receive the load information sent by the candidate UEs.

14 . The communication device according to claim 13 , wherein the processor is further configured to receive the load information sent by the candidate UEs by at least one of:

receiving the load information broadcast by the candidate UEs; or,

receiving the load information unicast by the candidate UEs through a dedicated signaling.

15 . The communication device according to claim 12 , wherein the load information comprises at least one of the following:

the overload indication, indicating whether the candidate UE is overloaded;

the load level, indicating the level of the load of the candidate UE; or

the load rate.

16 . The communication device according to claim 12 , wherein the processor is further configured to:

select, according to the load information of the candidate UEs, a third UE whose load status meets the requirement as the relay UE.

17 . The communication device according to claim 12 , wherein the processor is further configured to:

select, in response to determining that there are at least two candidate UEs whose load status differences are within a preset range and all the load status of the at least two candidate UEs meet the requirement, according to a selection strategy, at least one candidate UE from at least two candidate UEs whose load status meet the requirement and are identical, as the relay UE.

18 . The communication device according to claim 17 , wherein the processor is further configured to select, according to the selection strategy, the at least one candidate UE from the at least two candidate UEs whose load status meet the requirement and are identical as the relay UE by one of the following acts:

selecting, based on the selection strategy, according to a channel quality of the SL between a first UE and the candidate UE, a candidate UE with a best channel quality from the at least two candidate UEs whose load status meet the requirement and are identical, as the relay UE;

selecting, based on the selection strategy, according to a channel quality of a cellular communication link between the base station and the candidate UE, a candidate UE with a best channel quality from the at least two candidate UEs whose load status meet the requirement and are identical, as the relay UE;

selecting, based on the selection strategy, according to a channel quality of a cellular communication link between the base station and the candidate UE and according to a distance between the candidate UE and the first UE, a candidate UE with a closest distance from the at least two candidate UEs whose load status meet the requirement and are identical, as the relay UE; or

based on the selection strategy, selecting a candidate UE with a best channel quality from the at least two candidate UEs whose load status meet the requirement and are identical as the relay UE.

19 . The communication device according to claim 12 , wherein the load information comprises: the load level, and the processor is further configured to:

determine, according to the load level and the first threshold, whether the load status of the candidate UE meets the requirement for being the relay UE;

or

wherein the load information comprises: the load rate; and the processor is further configured to:

determine, according to the load rate and the second threshold, whether the load status of the candidate UE meets the requirement for being the relay UE.

20 . A communication system, comprising: a first UE, candidate UEs and a base station;

wherein the first UE is configured to:

select, according to load information of candidate UEs, a relay UE from the candidate UEs;

wherein the load information is determined by the candidate UE based on a measurement result of sidelink communication (SL) and load indication information;

wherein the measurement result of the SL is obtained by the candidate UE by measuring a transmission link, and the measurement result of the SL comprises at least one of a channel busy ratio (CBR) of the SL or a channel occupancy ratio (CR) of the SL; and

wherein the load indication information is sent by the base station to the candidate UE, and the load indication information is configured to indicate a load status of a cellular communication link between the candidate UE and the base station;

wherein the first UE is further configured to:

select, according to the load information of the candidate UEs, the relay UE from the candidate UEs whose load status meets a requirement,

wherein the load status meeting the requirement comprises at least one of:

an overload indication, indicating that the candidate UE is not overloaded;

a load level, indicating that a level of a load of the candidate UE is lower than a first threshold; or

a load rate, indicating that a load rate of the candidate UE is lower than a second threshold; and

determine that there are at least two candidate UEs whose load status meets the requirement, and select a candidate UE with a lowest load level or a lowest load rate as the relay UE;

wherein the candidate UE is configured to send the load information to the first UE;

wherein the base station is configured to send the load indication information to the candidate UE; wherein the load indication information is used for the candidate UE to determine the load information.

Assignments (1)

Continuity (1)

References Cited (25)