Method and apparatus for transmitting and receiving a signal in a wireless communication system supporting a relay UE

1. A method for transmitting and receiving by a Relay user equipment (UE), a signal in a wireless communication system, the method comprising:

receiving indication information which indicates a remote UE is out of coverage from one or more remote UEs;

transmitting state information of the Relay UE to the one or more remote UEs based on the indication information,

wherein the state information of the Relay UE includes battery state information of the Relay UE, and

wherein the battery state information of the Relay UE includes:

a total capacity of a battery of the Relay UE,

a remaining life of the battery of the Relay UE,

a remaining battery capacity of the battery of the Relay UE,

charge speed information for whether a speed at which the battery of the Relay UE is charged is sufficient to accept a connection request from the one or more remote UEs,

discharge speed information for whether a speed at which the battery of the Relay UE is discharged is sufficient to accept the connection request from the one or more remote UEs, and

battery state information of another Relay UE,

receiving the connection request for transmitting and receiving the signal from the one or more remote UEs;

determining whether or not to accept the connection request for the one or more remote UEs based on the state information of the Relay UE; and

transmitting a response including the determination result to the one or more remote UEs,

wherein a transmission of the state information of the Relay UE is stopped based on a specific timer being started with an initial transmission of the battery state information of the Relay UE.

2. The method of claim 1 , wherein the state information of the Relay UE further includes information for the number of the one or more remote UEs connected to the Relay UE.

3. The method of claim 2 , further comprising:

receiving state information of a neighbor Relay UE from the neighbor relay UE,

wherein the state information of the neighbor Relay UE includes at least one of battery state information of the neighbor Relay UE and information for the number of the one or more remote UEs connected to the neighbor Relay UE.

4. The method of claim 3 , wherein the determination as to whether or not to accept the connection request for the one or more remote UEs uses at least one of the state information of the Relay UE and the state information of the neighbor Relay UE.

5. The method of claim 3 , wherein the neighbor relay UE is a UE that is within a coverage of the Relay UE.

6. The method of claim 1 , further comprising:

receiving a request for transmitting a first additional information from the one or more remote UEs; and

transmitting the first additional information to the one or more remote UEs.

7. The method of claim 6 , wherein the first additional information indicates whether the battery is sufficiently charged to connect to the one or more remote UEs, or whether the battery is being discharged.

8. The method of claim 7 , wherein the first additional information further includes information indicating that the connection request is acceptable.

9. The method of claim 6 , wherein the first additional information is included in the state information of the Relay UE.

10. The method of claim 1 , wherein the response includes information for whether another Relay UE is within the same coverage as the one or more Remote UEs if the connection request is not accepted.

11. The method of claim 1 , further comprising:

transmitting identification information identifying the relay UE to the one or more remote UEs,

wherein the identification information is transmitted together with the state information of the Relay UE.

12. A Relay user equipment (UE) for transmitting and receiving a signal in a wireless communication system, the Relay UE comprising:

a communication module configured to communicate with the outside in a wireless or a wired manner; and

a processor functionally connected to the communication module, wherein the processor is configured:

to receive indication information which indicates a remote UE is out of coverage from one or more remote UEs,

to transmit state information of the Relay UE to the one or more remote UEs based on the indication information,

wherein the state information of the Relay UE includes battery state information of the Relay UE, and

wherein the battery state information of the Relay UE includes:

a total capacity of a battery of the Relay UE,

a remaining life of the battery of the Relay UE,

a remaining battery capacity of the battery of the Relay UE,

charge speed information for whether a speed at which the battery of the Relay UE is charged is sufficient to accept a connection request from the one or more remote UEs,

discharge speed information for whether a speed at which the battery of the Relay UE is discharged is sufficient to accept the connection request from the one or more remote UEs, and

battery state information of another Relay UE,

to receive the connection request for transmitting and receiving the signal from the one or more remote UEs;

to determine whether or not to accept the connection request for the one or more remote UEs based on the state information of the Relay UE; and

to transmit a response including the determination result to the one or more remote UEs,

wherein a transmission of the state information of the Relay UE is stopped based on a specific timer being started with an initial transmission of the battery state information of the Relay UE.