METHOD FOR PEER DISCOVERY USING DEVICE-TO-DEVICE LINK

• US 20130114526A1
• Filed: 10/15/2012
• Published: 05/09/2013
• Est. Priority Date: 10/14/2011
• Status: Abandoned Application

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: AHN, Jae Young, YEH, Choong Il
• Application Number:
  US13/652,077
• Publication Number:
  US 20130114526A1
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 40/246 Connectivity information discovery
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

A method for discovery using a device-to-device link is disclosed. A method of operating a device includes receiving a request to transmit discovery information, and transmitting or not transmitting the discovery information based on the request. Using the method of operating a device, power consumption of devices and waste of radio resources in a discovery process of direct communication between devices can be reduced, and a problem of resource collision between adjacent devices can be resolved. Further, a problem of adjacent devices assigned to specific frequency resources having a bad channel property not being discovered can be resolved by coping with frequency selectivity.

Claims

1. A method of operating a device in discovery using a device-to-device link, the method comprising the steps of:

(a) receiving a request to transmit discovery information; and

(b) transmitting or not transmitting discovery information based on the request.

2. The method of claim 1, wherein, when the discovery information is transmitted in step (b), the transmitted discovery information is received by a device desiring to discover an adjacent device/service.

3. The method of claim 1, wherein, in step (a), the transmission of the discovery information is requested from at least one of a user and an application.

4. The method of claim 1, wherein, in step (a), the transmission of the discovery information is requested from another device via the device-to-device link or a base station.

5. The method of claim 1, further comprising the step of:

(c) requesting another device to transmit the discovery information via the device-to-device link and receiving the discovery information from the other device based on the request to transmit the discovery information.

6. A method of operating a device in discovery using a device-to-device link, the method comprising the step of:

transmitting discovery information for discovery to adjacent devices,

wherein some bits (a bit sequence) of the discovery information for discovery designate a type of the discovery information.

7. The method of claim 6, wherein the bit sequence specifies a group to which the discovery information belongs.

8. The method of claim 6, wherein, when the bit sequence has a predetermined value, a message to be delivered to an adjacent device is contained in a part other than the bit sequence in the discovery information.

9. A method of operating a device in discovery using a device-to-device link, the method comprising the steps of:

(a) selecting a discovery channel for discovery information transmission;

(b) dividing a resource of the discovery channel in each frame into X resource sub-blocks (X is a natural number) and dividing the discovery information into X sub-blocks;

(c) transmitting x discovery information sub-blocks (x<

=X) among the X resource sub-blocks; and

(d) performing reception in X-x resource sub-blocks among the X resource sub-blocks.

10. The method according to claim 9, wherein, in step (c), the number and the position of resource sub-blocks in which transmission is performed among the X resource sub-blocks are randomly determined.

11. The method according to claim 9, wherein a guard period for transmission (reception)/reception (transmission) transition (T/R and R/T transition) is present between the X resource sub-blocks.

12. The method according to claim 9, wherein, in step (c), reception is performed in the X-x resource sub-blocks among the X resource sub-blocks, and when a reception level of the resource sub-blocks is equal to or greater than a predetermined threshold, a discovery channel other than the discovery channel selected in step (a) is reselected to perform steps (b) to (d).

13. The method according to claim 12, wherein the predetermined threshold is based on a prescribed absolute value or a moving average of reception levels of previously received resource sub-blocks.

14. A method of operating a device in discovery using a device-to-device link, wherein a resource of a discovery channel for discovery information transmission is frequency-hopped and selected.

15. The method according to claim 14, wherein the resource of the discovery channel is frequency-hopped in units of frame periods.

16. The method according to claim 14, wherein the resource of the discovery channel is frequency-hopped in units of resource sub-blocks.

17. The method according to claim 14, wherein the resource of the discovery channel is frequency-hopped in units of OFDM symbols.