Method for performing sidelink communication in wireless communication system and apparatus therefor

1. A method for performing, by a first user equipment (UE), a sidelink communication through a terminal-to-network relay operation in a wireless communication system, the method comprising:

configuring a sidelink with a second UE by performing a device to device (D2D) discovery procedure;

transmitting, to a base station, a control message including indication information indicating whether a radio access technology (RAT) type of the configured sidelink with the second UE is a 3GPP access or a non-3GPP access;

receiving, from the base station, a radio resource for transmitting and receiving a signal with the second UE through the sidelink; and

transmitting and receiving the signal with the second UE based on the received radio resource,

wherein the radio resource is configured differently for (i) a case where the indication information indicates the RAT type of the sidelink as the 3GPP access and (ii) a case where the indication information indicates the RAT type of the sidelink as the non-3GPP access,

wherein for the case where the indication information indicates that the RAT type of the sidelink is the 3GPP access, the radio resource is a resource related to medium access control (MAC), radio link control (RLC) and packet data convergence protocol (PDCP) configuration, and

wherein for the case where the indication information indicates that the RAT type of the sidelink is the non-3GPP access, the radio resource is a resource related to PDCP configuration only.

2. The method of claim 1 , wherein the control message is a non-access stratum (NAS) message or sidelinkUEInformation.

3. The method of claim 1 , wherein the first UE is a remote user equipment (UE) or a relay UE.

4. The method of claim 1 , wherein based on the first UE being a remote UE, the second UE is a relay UE,

wherein the first UE is linked to the second UE.

5. The method of claim 1 , wherein the 3GPP access is long term evolution (LTE) or fifth generation (5G),

wherein the non-3GPP access is Bluetooth or Wi-Fi.

6. The method of claim 1 , wherein a size of the indication information is 1 bit,

wherein based on a value of the indication information being equal to ‘1’, the RAT type represents the 3GPP access,

wherein based on a value of the indication information being equal to ‘0’, the RAT type represents the non-3GPP access.

7. A first user equipment (UE) configured to perform a sidelink communication through a terminal-to-network relay operation in a wireless communication system, the first UE comprising:

a radio frequency (RF) module configured to transmit and receive a radio signal; and

a processor functionally connected to the RF module,

wherein the processor is configured to:

configure a sidelink with a second UE by performing a device to device (D2D) discovery procedure;

transmit, to a base station, a control message including indication information indicating whether a radio access technology (RAT) type of the configured sidelink with the second UE is a 3GPP access or a non-3GPP access;

receive, from the base station, a radio resource for transmitting and receiving a signal with the second UE through the sidelink; and

transmit and receive the signal with the second UE based on the received radio resource,

wherein the radio resource is configured differently for (i) a case where the indication information indicates the RAT type of the sidelink as the 3GPP access and (ii) a case where the indication information indicates the RAT type of the sidelink as the non-3GPP access,

wherein for the case where the indication information indicates that the RAT type of the sidelink is the 3GPP access, the radio resource is a resource related to medium access control (MAC), radio link control (RLC) and packet data convergence protocol (PDCP) configuration, and

wherein for the case where the indication information indicates that the RAT type of the sidelink is the non-3GPP access, the radio resource is a resource related to PDCP configuration only.

8. A non-transitory computer-readable storage medium storing instructions that, based on being executed by a processor, control a first user equipment (UE) to perform operations for a sidelink communication through a terminal-to-network relay operation in a wireless communication system, the operations comprising:

configuring a sidelink with a second UE by performing a device to device (D2D) discovery procedure;

transmitting, to a base station, a control message including indication information indicating whether a radio access technology (RAT) type of the configured sidelink with the second UE is a 3GPP access or a non-3GPP access;

receiving, from the base station, a radio resource for transmitting and receiving a signal with the second UE through the sidelink; and

transmitting and receiving the signal with the second UE based on the received radio resource,

wherein the radio resource is configured differently for (i) a case where the indication information indicates the RAT type of the sidelink as the 3GPP access and (ii) a case where the indication information indicates the RAT type of the sidelink as the non-3GPP access,

wherein for the case where the indication information indicates that the RAT type of the sidelink is the 3GPP access, the radio resource is a resource related to medium access control (MAC), radio link control (RLC) and packet data convergence protocol (PDCP) configuration, and

wherein for the case where the indication information indicates that the RAT type of the sidelink is the non-3GPP access, the radio resource is a resource related to PDCP configuration only.