METHOD AND APPARATUS FOR PERFORMING DEVICE TO DEVICE SERVICE IN WIRELESS COMMUNICATION SYSTEM

• US 20160014825A1
• Filed: 03/10/2014
• Published: 01/14/2016
• Est. Priority Date: 03/11/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Hakseong, KIM, Byounghoon
• Granted Patent: US 9,706,585 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 28/26 Resource reservation
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 76/11 Allocation or use of connection identifiers
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

One embodiment of the present invention provides a method and an apparatus for performing device to device (D2D) service in a wireless communication system, and specifically, provides a method for using a discovery signal including an identifier which can be identified in a physical layer and the like when a terminal supporting a D2D service receives a signal related to an advertisement. The invention determines whether to receive an additional advertisement signal on the basis of the identifier. The discovery signal is preferably transmitted in a radio resource control (RRC) idle mode. The D2D terminal that receives the discovery signal communicates with a base station by an improved method having an improved effect with respect to power.

Claims

1. A method for performing a first communication device supporting a device to device (D2D) service in a wireless communication system, the method comprising:

receiving a discovery signal including an advertisement identifier (ID) that can be identified in a physical layer of the first communication device from a second communication device supporting the D2D service in a radio resource control (RRC) idle mode;

determining, in the physical layer of the first communication device, whether to receive an additional advertisement signal from the second communication device on the basis of the advertisement ID;

if it is determined to receive the additional advertisement signal, setting up an RRC connection with respect to a base station in response to the discovery signal;

after the RRC connection is set up, transmitting a D2D link setup request message for setting up a D2D link with respect to the second communication device to the base station on the basis of information related to the second communication device and included in the discovery signal;

setting up the D2D link with respect to the second communication device by using a resource scheduled by the base station; and

receiving the additional advertisement signal through the D2D link.

2. The method of claim 1, wherein the determining of whether to receive the additional advertisement signal from the second communication device comprises not receiving the additional advertisement signal from the second communication device if at least any one of a reception time, reception count, and reception region of the discovery signal does not satisfy a predetermined condition.

3. The method of claim 1, wherein the determining of whether to receive the additional advertisement signal from the second communication device comprises:

comparing, in the physical layer, the advertisement ID and an advertisement blocking information which is input by a user of the first communication device through an upper layer application; and

if the advertisement ID corresponds to the advertisement blocking information, determining not to receive the additional advertisement signal from the second communication device.

4. The method of claim 1, further comprising:

if it is determined to receive the additional advertisement signal, storing the advertisement ID; and

if the additional discovery signal including the same ID as the stored advertisement ID is received within a predetermined time duration, discarding, in the physical layer, the additional discovery signal.

5. The method of claim 1, further comprising:

if it is determined to receive the additional advertisement signal, storing the advertisement ID; and

if the additional discovery signal including the same ID as the stored advertisement ID is received at a predetermined location of the first communication device, discarding, in the physical layer, the additional discovery signal.

6. The method of claim 1, wherein the discovery signal includes a sequence part and a message part.

7. A method for performing a first communication device supporting a device to device (D2D) service in a wireless communication system, the method comprising:

receiving a discovery signal including an advertisement identifier (ID) that can be identified in a physical layer of the first communication device from a second communication device supporting the D2D service in a radio resource control (RRC) idle mode;

determining whether to receive an additional signal corresponding to the advertisement ID on the basis of the advertisement ID;

if it is determined not to receive the additional signal, discarding the discovery signal;

if it is determined to receive the additional signal, determining, in the physical layer of the first communication device, whether a mapping table corresponding to the advertisement ID is stored in the first communication device;

if the mapping table corresponding to the advertisement ID is stored in the first communication device, obtaining advertisement contents included in the mapping table;

if the mapping table corresponding to the advertisement ID is not stored in the first communication device, setting up an RRC connection with respect to a base station in order to receive an additional advertisement signal from the second communication device;

after the RRC connection is set up, transmitting a D2D link setup request message for setting up a D2D link with respect to the second communication device to the base station on the basis of information related to the second communication device and included in the discovery signal;

setting up the D2D link with respect to the second communication device by using a resource scheduled by the base station; and

receiving the additional advertisement signal through the D2D link.

8. The method of claim 7, wherein the obtaining of the advertisement contents included in the mapping table comprises accessing a server indicated in the mapping table to obtain the advertisement contents.

9. The method of claim 7, wherein the mapping table is periodically stored in the first communication device.

10. A first communication device supporting a device to device (D2D) service in a wireless communication system, comprising:

a wireless processing unit for processing a wireless signal; and

a processing unit for controlling the wireless processing unit, wherein the processing unit is configured for;

receiving a discovery signal including an advertisement identifier (ID) that can be identified in a physical layer of the first communication device from a second communication device supporting the D2D service in a radio resource control (RRC) idle mode;

determining whether to receive an additional signal corresponding to the advertisement ID on the basis of the advertisement ID;

if it is determined not to receive the additional signal, discarding the discovery signal;

if it is determined to receive the additional signal, determining, in the physical layer of the first communication device, whether a mapping table corresponding to the advertisement ID is stored in the first communication device;

if the mapping table is stored in the first communication device, obtaining advertisement contents included in the mapping table;

if the mapping table corresponding to the advertisement ID is not stored, setting up an RRC connection with respect to a base station in order to receive an additional advertisement signal from the second communication device;

after the RRC connection is set up, transmitting a D2D link setup request message for setting up a D2D link with respect to the second communication device to the base station on the basis of information related to the second communication device and included in the discovery signal;

setting up the D2D link with respect to the second communication device by using a resource scheduled by the base station; and

receiving the additional advertisement signal through the D2D link.