Connection establishment method, device, and system

1. A connection establishment method, applied to a first user equipment, the method comprising:

receiving, by the first user equipment, at least one served object group identifier sent by a network device, wherein each of the at least one served object group identifier indicates a group of served objects for which the first user equipment provides a relay service;

monitoring, by the first user equipment, discovery information broadcast by a second user equipment,

wherein the discovery information comprises an identifier of a second group of served objects by a relay service and a relay service request, the relay service request is used to request the relay service, and

wherein the second user equipment belongs to the second group of served objects by a relay service or a user of the second user equipment belongs to the second group of served objects by a relay service; and

determining, by the first user equipment, that the at least one served object group identifier comprises the identifier of the second group, establishing a connection between the first user equipment and the second user equipment according to a data link layer identification (ID) of the second user equipment.

2. The method according to claim 1 , wherein before receiving the at least one served object group identifier from the network device, the method further comprises:

sending, by the first user equipment, a service authorization request to the network device; and

wherein receiving the at least one served object group identifier from the network device comprises:

receiving, by the first user equipment, a service authorization response from the network device, wherein the service authorization response comprises the at least one served object group identifier.

3. The method according to claim 1 , wherein before receiving the at least one served object group identifier from the network device, the method further comprises:

receiving, by the first user equipment, a served object group name from the network device, wherein the served object group name is associated with the at least one served object group identifier; and

sending, by the first user equipment, discovery request information to the network device, wherein the discovery request information comprises the served object group name; and

wherein receiving the at least one served object group identifier from the network device comprises:

receiving, by the first user equipment, discovery acknowledgement information from the network device, wherein the discovery acknowledgement information comprises the at least one served object group identifier.

4. The method according to claim 1 , wherein the discovery information further comprises a discovery code of the second user equipment.

5. A connection establishment method, applied to a second user equipment, the method comprising:

receiving, by the second user equipment, broadcast information from a first user equipment,

wherein the broadcast information includes a data link layer identification (ID) of the first user equipment, a relay service request, and a served object group identifier authorized by a network device, and

wherein the served object group identifier indicates a group of served objects for which the first user equipment provides a relay service;

determining, by the second user equipment, that the first user equipment is capable of providing a relay service according to the served object group identifier; and

sending, by the second user equipment, a connection request to the first equipment for establishing a connection between the first user equipment and the second user equipment.

6. The method according to claim 5 , further comprising:

receiving, by the second user equipment, broadcast information from multiple user equipment; and

selecting, by the second user equipment, the first user equipment as a relay user equipment.

7. A first user equipment comprising:

a processor; and

a non-transitory computer-readable storage medium coupled to the processor and storing programming instructions for execution by the processor, the programming instructions instruct the processor to:

receive at least one served object group identifier from a network device, wherein each of the at least one served object group identifier indicates a group of served objects for which the first user equipment provides a relay service;

monitor discovery information broadcast by a second user equipment,

wherein the discovery information comprises an identifier of a second group of served objects by a relay service and a relay service request, the relay service request is used to request the relay service, and

wherein the second user equipment belongs to the second group of served objects by a relay service or a user of the second user equipment belongs to the second group of served objects by a relay service;

determine that the at least one served object group identifier comprises the identifier of the second group; and

establish a connection between the first user equipment and the second user equipment according to a data link layer identification (ID) of the second user equipment.

8. The first user equipment according to claim 7 , wherein the programming instructions further instruct the processor to:

send a service authorization request to the network device; and

receive a service authorization response from the network device, wherein the service authorization response carries the at least one served object group identifier.

9. The first user equipment according to claim 7 , wherein the programming instructions further instruct the processor to:

receive a served object group name from the network device, wherein the served object group name is associated with the at least one served object group identifier;

send discovery request information to the network device, wherein the discovery request information comprises the at least one served object group name; and

receive discovery acknowledgement information from the network device, wherein the discovery acknowledgement information comprises the at least one served object group identifier.

10. The first user equipment according to claim 7 , wherein the discovery information further comprises a discovery code of the second user equipment.

11. A second user equipment comprising:

a processor; and

a non-transitory computer-readable storage medium coupled to the processor and storing programming instructions for execution by the processor, the programming instructions instruct the processor to:

receive broadcast information from a first user equipment,

wherein the broadcast information includes a data link layer identifier (ID) of the first user equipment, a relay service request, and a served object group identifier authorized by a network device, and

wherein the served object group identifier indicates a group of served objects for which the first user equipment provides a relay service;

determine that the first user equipment is capable of providing a relay service according to the served object group identifier; and

send a connection request to the first equipment for establishing a connection between the first user equipment and the second equipment.

12. The second user equipment according to claim 11 , wherein the programming instructions further instruct the processor to:

receive broadcast information from multiple user equipment; and

select the first user equipment as a relay user equipment.

13. The method according to claim 1 , wherein the discovery information further comprises the data link layer ID of the second user equipment.

14. The first user equipment according to claim 7 , wherein the discovery information further comprises the data link layer ID of the second user equipment.