Method for relay terminal to transmit and receive signals in wireless communication system and device for same

1. A method for a relay terminal to transmit and receive signals in a wireless communication system, the method comprising:

transmitting, in a first time region, a UL signal to an upper node through a backhaul link and a DL signal to at least one lower node through an access link; and

receiving, in a second time region, a DL signal from the upper node through the backhaul link and a UL signal from the at least one lower node through the access link,

wherein different frequency resources are allocated to the UL signal and the DL signal in the same carrier in each of the first time region and the second time region, and

wherein the backhaul link and the access link are side links (SLs).

2. The method of claim 1 , comprising:

calculating transmission power required for UL signal transmission through the backhaul link and transmission power required for DL signal transmission through the access link; and

adjusting any one transmission power among the calculated transmission powers based on a predetermined condition is-being satisfied.

3. The method of claim 2 , wherein the predetermined condition is satisfied based on a sum of the calculated transmission powers exceeding a maximum transmission power of the relay terminal or a difference between the calculated transmission powers exceeds a specific value.

4. The method of claim 3 , wherein in the adjusting of the transmission power,

a signal having a lower priority of the UL signal transmitted through the backhaul link and the DL signal transmitted through the access link is determined according to a predetermined priority, and

transmission of the signal having the lower priority is abandoned or a transmission power of the corresponding signal is adjusted.

5. The method of claim 4 , wherein in the adjusting of the transmission power,

of the UL signal transmitted through the backhaul link and the DL signal transmitted through the access link,

1) a signal corresponding to any one of a scheduling assignment channel (SACH), a scheduled data channel (DCH), or a direct data channel (dDCH),

2) the DL signal transmitted through the access link, and

the signal corresponding to 1) or 2) above is determined as the signal having the lower priority.

6. The method of claim 1 , wherein the frequency resource includes at least one narrow band, and

the at least one narrow band is frequency-hopped according to a specific hopping pattern.

7. The method of claim 6 , wherein a narrow band fixed to a specific frequency location is allocated to a Synchronization Channel (SCH) or a Broadcast data Channel (BCH) among the DL signals received through the backhaul link.

8. The method of claim 1 , wherein the frequency resource includes a plurality of narrow bands, and

a specific signal among the signals transmitted or received through the backhaul link or the access link is transmitted or received through a specific narrow band among the plurality of narrow bands.

9. The method of claim 8 , wherein the specific signal is at least one of the synchronization channel (SCH), the broadcast data channel (BCH), a random access channel (RACH), or an HARQ feedback channel (HCH).

10. The method of claim 9 , wherein the specific narrow band is frequency-hopped according to a specific hopping pattern.

11. A relay terminal transmitting and receiving signals in a wireless communication system, the relay terminal comprising:

a transceiver transmitting and receiving a radio signal;

a memory; and

a processor connected to the transceiver and the memory,

wherein the processor is configured to

transmit, in a first time region, a UL signal to an upper node through a backhaul link and a DL signal to at least one lower node through an access link, and

receive, in a second time region, a DL signal from the upper node through the backhaul link and a UL signal from the at least one lower node through the access link,

wherein the different frequency resources are allocated to the UL signal and the DL signal in the same carrier in each of the first time region and the second time region, and

wherein the backhaul link and the access link are side links (SLs).

12. The relay terminal of claim 11 , wherein the processor is configured to

calculate transmission power required for UL signal transmission through the backhaul link and transmission power required for DL signal transmission through the access link, and

adjust any one transmission power among the calculated transmission powers based on a predetermined condition being satisfied.

13. The relay terminal of claim 12 , wherein the predetermined condition is satisfied based on a sum of the calculated transmission powers exceeding a maximum transmission power of the relay terminal or a difference between the calculated transmission powers exceeds a specific value.