Method for detecting search signal for device-to-device (D2D) communication in wireless communication system, and apparatus therefor

• US 9,913,123 B2
• Filed: 07/21/2014
• Issued: 03/06/2018
• Est. Priority Date: 07/19/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Seungmin, Chae, Hyukjin, Kim, Hakseong, Seo, Hanbyul
• Primary Examiner(s): Crutchfield, Christopher
• Application Number:
  US14/900,545
• Publication Number:
  US 20160150391A1
• Time in Patent Office: 1,324 Days
• CPC Class Codes: H04B 7/2656 for structure of frame, burst
• CPC Class Codes: H04L 1/0038 Blind format detection for detection of modulation format H04L27/0012
• CPC Class Codes: H04L 1/0046 Code rate detection or code type detection H04L1/0038 takes precedence; detection of the data rate H04L25/0262; for packet format H04L1/0091
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 27/2666 Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 56/002 Mutual synchronization
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/51 based on terminal or device properties
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

The present invention relates to a method for detecting a search signal of a first terminal for device-to-device (D2D) communication in a wireless communication system. Specifically, the method comprises the steps of: receiving search signals from second terminals; and obtaining control information for D2D communication by carrying out blind decoding of the search signals, wherein a search space for the blind decoding consists of at least one virtual resource block (VRB) set configured on the basis of multiple physical resource block sets which are predefined such that the search signals are assigned thereto.

Claims

1. A method for detecting a discovery signal for device-to-device (D2D) communication by a first user equipment (UE) in a wireless communication system, the method comprising:

receiving the discovery signal from second UEs; and

acquiring control information for D2D communication by performing blind decoding of the discovery signal based on reference signal parameters including a delay counter defined to measure an effective channel, if the discovery signal is associated with reference signal resources for which an energy above a predefined threshold is detected, and if the discovery signal is associated with one of the second UEs having a corresponding delay counter not equal to 0,

wherein a search space for blind decoding consists of the reference signal resources for which the energy above the predefined threshold is detected.

2. The method according to claim 1,

wherein the discovery signal is identified according to a reference signal resource allocated differently to the second UEs.

3. The method according to claim 2,

wherein the reference signal resource is associated with at least one of an antenna port number, a cyclic shift index, a scrambling identifier, a physical cell identifier, a virtual cell identifier, and an orthogonal cover code (OCC) index.

4. The method according to claim 1,

wherein the discovery signal is blind-decoded based on a reference signal resource randomly selected from a reference signal resource pool signaled from a base station.

5. The method according to claim 4,

wherein the reference signal resource pool is cell-specific.

6. A first user equipment (UE) for detecting a discovery signal for device-to-device (D2D) communication in a wireless communication system, the first UE comprising:

a radio frequency unit; and

a processor,

wherein the processor is configured to receive the discovery signal from second UEs and to acquire control information for D2D communication by performing blind decoding of the discovery signal based on reference signal parameters including a delay counter defined to measure an effective channel, if the discovery signal is associated with reference signal resources for which an energy above a predefined threshold is detected, and if the discovery signal is associated with one of the second UEs having a corresponding delay counter not equal to 0, and

wherein a search space for blind decoding consists of the reference signal resources for which the energy above the predefined threshold is detected.