Method and apparatus for adjusting device-to-device timing in wireless communication system

• US 9,848,286 B2
• Filed: 08/04/2014
• Issued: 12/19/2017
• Est. Priority Date: 08/04/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Youngdae, Jung, Sunghoon
• Primary Examiner(s): Zaidi, Iqbal
• Application Number:
  US14/906,846
• Publication Number:
  US 20160165561A1
• Time in Patent Office: 1,233 Days
• Field of Search: 370328-339
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04L 67/1051 Group master selection mechanisms
• CPC Class Codes: H04W 36/06 Reselecting a communication resource in the serving access point
• CPC Class Codes: H04W 36/30 by measured or perceived connection quality data
• CPC Class Codes: H04W 36/304 due to measured or perceived resources with higher communication quality
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 4/08 User group management
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 76/20 Manipulation of established connections
• CPC Class Codes: H04W 76/23 Manipulation of direct-mode connections
• CPC Class Codes: H04W 76/30 Connection release
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 8/186 Processing of subscriber group data
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: H04W 84/20 Master-slave selection or change arrangements
• CPC Class Codes: H04W 88/06 : adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A method and apparatus for adjusting device-to-device (D2D) timing in a wireless communication system is provided. The method includes detecting a signal on a second D2D group, and adjusting D2D timing of the first D2D group based on the detected signal on the second D2D group. The first D2D group includes a first device and a second device which perform D2D operation in the first D2D group, and the second D2D group includes a third device and a fourth device which perform D2D operation in the second D2D group.

Claims

1. A method for adjusting, by a first group owner device of a first device-to-device (D2D) group, D2D timing in a wireless communication system, the method comprising:

detecting interference from a second D2D group;

transmitting a reference signal to all group member devices of the first D2D group;

receiving a D2D timing difference, which is calculated by a first group member device of the first D2D group, from the first group member device,

wherein the D2D timing difference is a timing difference between the reference signal transmitted from the first group owner device and a reference signal transmitted from a second group owner device;

adjusting D2D timing of the first D2D group to avoid the detected interference from the second D2D group, based on the received D2D timing difference; and

transmitting the adjusted D2D timing of the first D2D group to the all group member devices of the first D2D group,

wherein the first group owner device operates as an access router of the first D2D group, and the second group owner device operates as an access router of the second D2D group.

2. The method of claim 1, wherein the interference from the second D2D group is detected by receiving a signal on the second D2D group.

3. The method of claim 2, wherein the signal on the second D2D group includes information on D2D resources used by the second D2D group.

4. The method of claim 3, wherein the D2D resources used by the second D2D group includes at least one of time resources or frequency resources used by the second D2D group.

5. The method of claim 1, further comprising:

receiving a D2D timing difference calculated by a network, from the network.

6. The method of claim 1, further comprising:

receiving, from the first group member device, measured quality of the reference signal transmitted from the second group owner device.

7. The method of claim 1, further comprising:

receiving information on the second group owner device of the second D2D group.

8. The method of claim 7, wherein the information on the second group owner device of the second D2D group includes at least one of a user equipment (UE) identity of the second group owner device of the second D2D group, D2D security information, or D2D-related code and sequence transmitted from the second group owner device of the second D2D group.

9. A first group owner device of a first device-to-device (D2D) group in a wireless communication system, the first device comprising:

a transceiver that transmits or receives a radio signal; and

a processor, coupled to the transceiver, that;

detects interference from a second D2D group,

controls the transceiver to transmit a reference signal to all group member devices of the first D2D group,

controls the transceiver to receive a D2D timing difference, which is calculated by a first group member device of the first D2D group, from the first group member device,

wherein the D2D timing difference is a timing difference between the reference signal transmitted from the first group owner device and a reference signal transmitted from a second group owner device,

adjusts D2D timing of the first D2D group to avoid the detected interference from the second D2D group, based on the received D2D timing difference, and

controls the transceiver to transmit the adjusted D2D timing of the first D2D group to the all group member devices of the first D2D group,

wherein the first group owner device operates as an access router of the first D2D group, and the second group owner device operates as an access router of the second D2D group.

10. The first device of claim 9, wherein the interference from the second D2D group is detected by receiving a signal on the second D2D group.