Method and apparatus for performing D2D operation in non-activated carrier in wireless communication system
A method and apparatus for performing device-to-device (D2D) operation in a wireless communication system is provided. A user equipment (UE) receives a signal for D2D operation, and performs the D2D operation in a non-activated carrier.
1. A method for performing, by a user equipment (UE), a device-to-device (D2D) operation in a wireless communication system, the method comprising:
receiving a signal for D2D operation from an anchor cell which is an activated cell,
wherein the signal for D2D operation includes a time/frequency tracking reference cell identifier (ID), and scheduled resources for a non-activated cell;
synchronizing time/frequency based on the time/frequency tracking reference cell ID; and
performing the D2D operation in the non-activated cell based on the scheduled resources, upon the synchronizing of the time/frequency.
2. The method of claim 1 , wherein the UE is in a radio resource control (RRC) connected mode and/or in a RRC idle mode.
3. The method of claim 1 , wherein the D2D operation includes at least one of a D2D discovery or a D2D communication.
4. The method of claim 1 , wherein the D2D operation includes at least one of a D2D transmission or a D2D reception.
5. The method of claim 1 , wherein the D2D operation includes at least one of a type 1 D2D operation or a type 2 D2D operation.
6. The method of claim 1 , wherein the anchor cell is a primary cell (PCell) or an activated secondary cell (SCell).
7. The method of claim 1 , wherein the signal for D2D operation allows the UE to monitor a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH) when the D2D operation is activated in the non-activated cell.
8. The method of claim 7 , wherein the signal for D2D operation is received via higher-layer signaling.
9. The method of claim 1 , wherein the signal for D2D operation includes at least one of a D2D transmission resource pool or a D2D reception resource pool.
10. The method of claim 1 , further comprising performing time/frequency tracking for the D2D operation.
11. The method of claim 10 , wherein the time/frequency tracking for the D2D operation is performed in a discovery reference signal (DRS) transmission timing.
12. The method of claim 1 , wherein the non-activated cell is related to an unlicensed carrier.
13. A user equipment (UE) comprising:
a memory;
a transceiver; and
a processor coupled to the memory and the transceiver, and configured to:
control the transceiver to receive a signal for device-to-device (D2D) operation from an anchor cell which is an activated cell, wherein the signal for D2D operation includes a time/frequency tracking reference cell identifier (ID), and scheduled resources for a non-activated cell;
synchronize time/frequency based on the time/frequency tracking reference cell ID; and
perform the D2D operation in the non-activated cell based on the scheduled resources, upon the synchronizing of the time/frequency.