Method and apparatus for relaying public signals in communication system

1. An operation method of a relay terminal for relaying radio communication between a base station and a remote terminal, the operation method comprising:

recognizing a relay request of the remote terminal for system information provided by the base station;

acquiring the system information from the base station; and

transmitting the system information to the remote terminal,

wherein the recognizing of the relay request of the remote terminal comprises:

receiving, from the base station, relay request identification information capable of identifying the relay request of the remote terminal for the system information;

receiving, from the remote terminal, a discovery message including the relay request identification information; and

recognizing the relay request for the system information by acquiring the relay request identification information from the received discovery message.

2. The operation method according to claim 1 , wherein the recognizing of the relay request of the remote terminal comprises:

receiving, from the remote terminal, a request message requesting relaying of the system information; and

recognizing the relay request for the system information from the received request message.

3. The operation method according to claim 1 , wherein the relay request identification information is an identifier for a request logical channel used by the remote terminal to transmit the discovery message to request transmission of the system information.

4. The operation method according to claim 1 , wherein the relay request identification information is information on a request discovery resource used by the remote terminal to transmit the discovery message to request transmission of the system information.

5. The operation method according to claim 1 , wherein the acquiring of the system information from the base station comprises:

requesting the base station to transmit the system information; and

receiving, from the base station, the system information in response to the transmission request.

6. The operation method according to claim 5 , wherein the requesting the base station to transmit the system information comprises:

selecting a first physical random access channel (PRACH) sequence requesting transmission of the system information, which is designated by the base station, among PRACH sequences; and

transmitting the first PRACH sequence to the base station on a PRACH.

7. The operation method according to claim 1 , further comprising:

receiving, from the remote terminal, a relay stop request for the system information; and

stopping transmission of the system information according to the relay stop request.

8. A relay terminal for relaying radio communication between a base station and a remote terminal in a communication system, the relay terminal comprising:

a processor;

a memory electronically communicating with the processor; and

instructions stored in the memory,

wherein when executed by the processor, the instructions cause the relay terminal to:

recognize a relay request of the remote terminal for system information provided by the base station;

acquire the system information from the base station; and

transmit the system information to the remote terminal,

wherein in the recognizing of the relay request of the remote terminal, the instructions cause the relay terminal to:

receive, from the base station, relay request identification information capable of identifying the relay request of the remote terminal for the system information;

receive, from the remote terminal, a discovery message including the relay request identification information; and

recognize the relay request for the system information by acquiring the relay request identification information from the received discovery message.

9. The relay terminal according to claim 8 , wherein in the recognizing of the relay request of the remote terminal, the instructions cause the relay terminal to:

receive, from the remote terminal, a request message requesting relaying of the system information; and

recognize the relay request for the system information from the received request message.

10. The relay terminal according to claim 8 , wherein the relay request identification information is an identifier for a request logical channel used by the remote terminal to transmit the discovery message to request transmission of the system information.

11. The relay terminal according to claim 8 , wherein the relay request identification information is information on a request discovery resource used by the remote terminal to transmit the discovery message to request transmission of the system information.