# US 10,375,746 B2 · Signal transmission method for device-to-device (D2D) communication in wireless communication system, and apparatus therefor

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- Number: US 10,375,746 B2
- Document ID: US10375746B2
- Status: Granted
- Kind: B2
- Application number: 15/323,069
- Filed: 2015-07-07
- Published: 2018-06-21
- Granted: 2019-08-06
- Earliest claimed: 2014-07-07
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Youngtae Kim; Hanbyul Seo; Inkwon Seo; Hyukjin Chae; Seungmin Lee
- Web page: https://patentgrep.com/patent/US10375746B2

## CPC

- H04W 76/14: Direct-mode setup
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04W 72/04: Wireless resource allocation
- H04W 72/12: Wireless traffic scheduling
- H04W 72/20: Control channels or signalling for resource management
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L 25/03866: {using scrambling}
- H04L 27/2613: {Structure of the reference signals}
- H04W 72/02: Selection of wireless resources by user or terminal
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

The present invention relates to a method and an apparatus for D2D signal transmission of a first terminal in a wireless communication system. Specifically, the method comprises the steps of: receiving a resource pool configuration indicating a D2D resource pool; and transmitting a D2D data channel on the basis of a D2D slot number which is re-indexed within the D2D resource pool.

## Claims

### Claim 1

A method of transmitting a device-to-device (D2D) signal of a first user equipment (UE) in a wireless communication system, comprising:
receiving a resource pool configuration for a D2D data channel;
determining a resource pool for the D2D data channel based on the resource pool configuration; and
transmitting the D2D data channel based on the resource pool for the D2D data channel,
wherein the D2D data channel includes a demodulation reference signal (DMRS),
wherein the DMRS is transmitted based on a D2D slot number that is re-indexed within the resource pool for the D2D data channel, and
wherein the D2D slot number is re-indexed using a modulo operation.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the D2D data channel has been scrambled using a scrambling sequence generated on the basis of the re-indexed D2D slot number.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the D2D data channel has been scrambled using a scrambling sequence generated on the basis of the D2D slot number, the D2D slot number having been re-indexed according to only uplink subframes within the resource pool for the D2D data channel.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the first UE and a second UE are respectively synchronized with different serving cells.

### Claim 5 (depends on 4)

The method according to claim 4, further comprising:
receiving, from a first serving cell with which the first UE is synchronized, slot index offset information of the first serving cell and a second serving cell with which the second UE is synchronized.

### Claim 6

A first user equipment (UE) transmitting a D2D signal in a wireless communication system, comprising:
a radio frequency unit; and
a processor,
wherein the processor is configured to:
receive a resource pool configuration for a D2D data channel,
determine a resource pool for the D2D data channel based on the resource pool configuration, and
transmit the D2D data channel based on the resource pool for the D2D data channel,
wherein the D2D data channel includes a demodulation reference signal (DMRS),
wherein the DMRS is transmitted based on a D2D slot number that is re-indexed within the resource pool for the D2D data channel, and
wherein the D2D slot number is re-indexed using a modulo operation.