Method for performing device-to-device communication in wireless access system and apparatus therefor

• US 9,265,078 B2
• Filed: 05/02/2012
• Issued: 02/16/2016
• Est. Priority Date: 05/02/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lim, Dongguk, Cho, Hangyu
• Primary Examiner(s): Hanidu, Ganiyu A
• Application Number:
  US14/115,173
• Publication Number:
  US 20140057670A1
• Time in Patent Office: 1,385 Days
• Field of Search: 455/450, 455/425, 455/452.2, 455/423, 455/456.1, 455/426.1, 455/519, 455/509, 455/39, 455/518, 455/11.1, 455/67.11, 370/331, 370/310, 370/328, 370/248, 370/352, 370/324, 370/338, 370/315, 370/252
• US Class Current: 1/1
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

The present invention provides a method for performing device-to-device communication in a wireless access system that supports the device-to-device communication and an apparatus therefor. Specifically, the invention comprises the steps of: receiving, from a base station, device-to-device communication parameters for broadcasted device-to-device communication; transmitting a detection signal to one or more devices using the received device-to-device communication parameters; receiving, from the one or more devices, link measurement information for measuring a link between a first device and the one or more devices using the detection signal; selecting a second device for performing the device-to-device communication from the one or more devices using the link measurement information; and performing the device-to-device communication with the selected second device.

Claims

1. A method for performing device-to-device (D2D) communication in a wireless access system supporting D2D communication, the method performed by a first device and comprising:

receiving D2D communication parameters broadcast by a base station (BS), the communication parameters including resource allocation for the D2D communication and transmission power information for controlling power of the D2D communication;

receiving predetermined signals from one or more devices by using the received communication parameters;

obtaining link measurement information by measuring a status of a D2D link between the one or more devices and a first device of the one or more devices by using the predetermined signals;

selecting a second device from the one or more devices for performing the D2D communication, the second device selected by using the link measurement information and signal received power threshold information; and

performing the D2D communication based on the selection of the second device by setting a higher priority for communication with the BS than for the D2D communication,

wherein the second device is selected when the link measurement information satisfies a predetermined threshold condition based on the signal received power threshold information.

2. The method according to claim 1, wherein the

second device is selected when the link measurement information matches the signal received power threshold information.

3. The method according to claim 1, wherein the received communication parameters further include a list of D2D connection,

identifiers and further comprising determining a connection identifier from the list for identifying D2D connection to the selected second device.

4. The method according to claim 3, further comprising transmitting a D2D communication confirmation signal to the BS and the second device, the signal containing at least an identifier of the second device, the determined connection identifier, or a start indication of the D2D communication.

5. The method according to claim 1, wherein the received communication parameters further include a list of devices supporting the D2D communication.

6. The method according to claim 1, further comprising:

transmitting a D2D communication request signal to the BS to start the D2D communication; and

receiving a communication response signal from the BS containing at least a modulation and coding scheme (MCS) for performing the D2D communication Multiple Input Multiple Output (MIMO), or connection identifier information.

7. The method according to claim 1, wherein the received communication parameters further include configuration information of the predetermined signals and time and frequency offset information for D2D synchronization.

8. An apparatus for performing device-to-device (D2D) communication in a wireless access system supporting D2D communication, the apparatus comprising:

a radio frequency (RF) unit configured to transmit and receive information; and

a processor configured to;

control the RF unit to receive D2D communication parameters for broadcast by a base station (BS), communication parameters including resource allocation for the D2D communication and transmission power information for controlling power of the D2D communication;

control the RF unit to receive predetermined signals from one or more devices by using the received communication parameters;

obtain link measurement information by measuring a status of a D2D link between the one or more devices and a first device of the one or more devices by using the predetermined signals;

select another device from the one or more devices for performing the D2D communication, the another device selected by using the link measurement information and signal received power threshold information; and

perform the D2D communication based on the selection of the another device by setting a higher priority for communication with the BS than for the D2D communication,

wherein the another device is selected when the link measurement information satisfies a predetermined threshold condition based on the signal received power threshold information.

9. The apparatus according to claim 8, wherein the

another device communication is selected when the link measurement information matches the signal received power threshold information.

10. The apparatus according to claim 8, wherein the received communication parameters further include a list of D2D connection identifiers and the processor is further configured to determine a connection identifier from the list for identifying D2D connection to the selected another device D2D connection identifiers.

11. The apparatus according to claim 10, wherein the processor is further configured to control the RF unit to transmit a D2D communication confirmation signal to the BS and the another device, the signal containing at least an identifier of the another device, the determined connection identifier, or a start indication of the D2D communication.

12. The apparatus according to claim 8, wherein the received communication parameters further include a list of devices supporting the D2D communication.

13. The apparatus according to claim 8, wherein the processor is further configured to control the RF unit to:

transmit a D2D communication request signal to the BS to start the D2D communication; and

receive a communication response signal from the BS containing at least a modulation and coding scheme (MCS) for performing the D2D communication, Multiple Input Multiple Output (MIMO), or connection identifier information.

14. The apparatus according to claim 8, wherein the D2D communication parameters further include configuration information of the predetermined signals and time and frequency offset information for D2D synchronization.