# US 10,321,448 B2 · Method and apparatus for performing D2D operation in non-activated carrier in wireless communication system

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- Number: US 10,321,448 B2
- Document ID: US10321448B2
- Status: Granted
- Kind: B2
- Application number: 15/319,507
- Filed: 2015-06-17
- Published: 2017-05-11
- Granted: 2019-06-11
- Earliest claimed: 2014-06-17
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Yunjung Yi; Hanbyul Seo; Seungmin Lee
- Web page: https://patentgrep.com/patent/US10321448B2

## CPC

- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 8/005: {Discovery of network devices, e.g. terminals}
- H04W 16/14: Spectrum sharing arrangements {between different networks}
- H04W 72/02: Selection of wireless resources by user or terminal
- H04W 76/14: Direct-mode setup
- H04W 76/20: Manipulation of established connections
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

The method of claim 1, wherein the UE is in a radio resource control (RRC) connected mode and/or in a RRC idle mode.

### Claim 3 (depends on 1)

The method of claim 1, wherein the D2D operation includes at least one of a D2D discovery or a D2D communication.

### Claim 4 (depends on 1)

The method of claim 1, wherein the D2D operation includes at least one of a D2D transmission or a D2D reception.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

The method of claim 1, wherein the anchor cell is a primary cell (PCell) or an activated secondary cell (SCell).

### Claim 7 (depends on 1)

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.

### Claim 8 (depends on 7)

The method of claim 7, wherein the signal for D2D operation is received via higher-layer signaling.

### Claim 9 (depends on 1)

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.

### Claim 10 (depends on 1)

The method of claim 1, further comprising performing time/frequency tracking for the D2D operation.

### Claim 11 (depends on 10)

The method of claim 10, wherein the time/frequency tracking for the D2D operation is performed in a discovery reference signal (DRS) transmission timing.

### Claim 12 (depends on 1)

The method of claim 1, wherein the non-activated cell is related to an unlicensed carrier.

### Claim 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.