METHOD FOR PERFORMING PAGING IN WIRELESS COMMUNICATION SYSTEM SUPPORTING DIRECT COMMUNICATION BETWEEN TERMINALS, AND D2D TERMINAL FOR THE METHOD

• US 20150119088A1
• Filed: 06/10/2013
• Published: 04/30/2015
• Est. Priority Date: 06/10/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Eunjong, Choi, Hyeyoung, Cho, Heejeong, Chung, Jaehoon
• Granted Patent: US 9,398,560 B2
• Time in Patent Office: Days
• US Class Current: 455/458
• CPC Class Codes: H04W 68/005 Transmission of information for alerting of incoming communication
• CPC Class Codes: H04W 68/02 Arrangements for increasing efficiency of notification or paging channel
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user

Abstract

A method of performing paging by a first D2D terminal in a wireless communication system supporting D2D communication includes: obtaining information on a paging slot, the paging slot being designated to be dedicated to the first D2D terminal for the D2D communication and including a plurality of paging sections; monitoring whether a signal for the first D2D terminal is transmitted in a first paging section in the obtained paging slot through a region assigned to the first D2D terminal; monitoring whether a paging request message is transmitted in a paging region only for the first D2D terminal in a second paging section if the signal is detected; and transmitting a paging response message through a third paging section to the second D2D terminal that transmits the paging request signal, as a response to the paging request message, if the paging request message is detected.

Claims

1. A method of performing paging by a first D2D UE in a wireless communication system supporting a device to device D2D communication, the method comprising:

obtaining information on a paging slot, the paging slot is designated for the first D2D UE only and contains a plurality of paging intervals for the D2D communication;

monitoring whether a signal for the first D2D UE is transmitted via a region assigned for the first D2D UE in a first paging interval in the obtained paging slot;

if the signal is detected, monitoring whether a paging request message is transmitted in a paging region dedicated to the first D2D UE in a second paging interval; and

if the paging request message is detected, transmitting a paging response message to a second D2D UE, which has transmitted the paging request signal, via a third paging interval in response to the paging request message.

2. The method of claim 1, further comprising:

receiving the information on the paging slot designated for the first D2D UE only from a base station via a broadcast message, a multicast message or a unicast message.

3. The method of claim 1, wherein the step of obtaining the information on the paging slot designated for the first D2D UE only further comprising determining an index of the paging slot based on a time unit index to which the first D2D UE is assigned in a discovery interval and a number of paging slots contained between D2D discovery slots.

4. The method of claim 1, wherein the step of obtaining the information on the paging slot designated for the first D2D UE only further comprising determining an index of the paging slot based on a paging slot offset value and a number of slots contained between D2D discovery slots.

5. The method of claim 1, wherein the paging request message comprises an identifier of the first D2D UE transmitting the paging request message, a candidate connection identifier (CID) list or a candidate link identifier (LID) list and wherein the paging response message comprises a CID or an LID selected from the candidate CID list or the candidate LID list.

6. The method of claim 5, further comprising the steps of:

performing a connection establishment based on the selected CID or the LID; and

directly transceiving data with the second D2D UE, which has transmitted the paging request message.

7. The method of claim 1, wherein the second paging interval corresponds to a paging request interval and wherein the third paging interval corresponds to a paging response interval.

8. The method of claim 1, wherein the first paging interval corresponds to a fast paging interval and wherein the region assigned for the first D2D UE corresponds to a single tone corresponding to an identifier of the first D2D UE.

9. A method of performing paging by a first D2D UE in a wireless communication system supporting a device to device (D2D) communication, the method comprising:

obtaining information on a paging slot, the paging slot is designated for the first D2D UE only and contains a plurality of paging intervals for the D2D communication;

transmitting a signal for a second D2D UE via a region assigned for the second D2D UE in a first paging interval in the obtained paging slot;

transmitting a paging request message in a paging region dedicated to the second D2D UE in a second paging interval; and

receiving a paging response message from the second D2D UE, which has received the paging request message, via a third paging interval in response to the paging request message.

10. A first D2D UE for performing paging in a wireless communication system supporting a D2D (device to device) communication, the first D2D UE comprising:

a processor configured to obtain information on a paging slot, the paging slot is designated for the first D2D UE only and contains a plurality of paging intervals for the D2D communication, the processor configured to monitor whether a signal for the first D2D UE is transmitted via a region assigned for the first D2D UE in a first paging interval in the obtained paging slot, the processor, if the signal is detected, configured to monitor whether a paging request message is transmitted in a paging region dedicated to the first D2D UE in a second paging interval; and

a transmitter, if the paging request message is detected, configured to transmit a paging response message to a second D2D UE, which has transmitted the paging request signal, via a third paging interval in response to the paging request message.

11. The first D2D UE of claim 10, further comprising:

a receiver configured to receive the information on the paging slot designated for the first D2D UE only from a base station via a broadcast message, a multicast message or a unicast message.

12. The first D2D UE of claim 10, wherein the processor is configured to obtain the information on the paging slot designated for the first D2D UE only in a manner of determining an index of the paging slot based on a time unit index to which the first D2D UE is assigned in a discovery interval and a number of paging slots contained between D2D discovery slots.

13. The first D2D UE of claim 10, wherein the processor is configured to obtain the information on the paging slot designated for the first D2D UE only in a manner of determining an index of the paging slot based on a paging slot offset value and a number of slots contained between D2D discovery slots.

14. The first D2D UE of claim 10, wherein the paging request message comprises an identifier of the first D2D UE transmitting the paging request message, a candidate connection identifier (CID) list or a candidate link identifier (LID) list and wherein the paging response message comprises a CID or an LID selected from the candidate CID list or the candidate LID list.

15. The first D2D UE of claim 14, wherein the processor is configured to perform a connection establishment based on the selected CID or the LID and directly transceive data with the second D2D UE, which has transmitted the paging request message.

16. A first D2D UE for performing paging in a wireless communication system supporting a D2D (device to device) communication, the first D2D UE comprising:

a processor configured to obtain information on a paging slot, the paging slot is designated for the first D2D UE only and contains a plurality of paging intervals for the D2D communication;

a transmitter configured to transmit a signal for a second D2D UE via a region assigned for the second D2D UE in a first paging interval in the obtained paging slot and transmit a paging request message in a paging region dedicated to the second D2D UE in a second paging interval; and

a receiver configured to receive a paging response message from the second D2D UE, which has received the paging request message, via a third paging interval in response to the paging request message.