METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING SIGNAL RELATED TO DEVICE-TO-DEVICE COMMUNICATION IN WIRELESS COMMUNICATION SYSTEM

• US 20160007383A1
• Filed: 03/06/2014
• Published: 01/07/2016
• Est. Priority Date: 03/07/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: CHAE, Hyukjin, LEE, Seungmin, KIM, Hakseong, SEO, Hanbyul
• Granted Patent: US 9,894,688 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 4/90 Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
• CPC Class Codes: H04W 68/005 Transmission of information for alerting of incoming communication
• CPC Class Codes: H04W 72/121 for groups of terminals or users
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 76/50 for emergency connections
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

Embodiments of the present invention relate to a method for transmitting/receiving a signal related to a device-to-device (D2D) communication by a first user equipment in a wireless communication system. The method comprises the steps of: stopping uplink transmission in a first band for a predetermined time interval and searching for a signal transmitted by a second user equipment; and transmitting a report to a third user equipment when the signal transmitted by the second user equipment is found, wherein the report contains the existence of the second user equipment and information related to a band in which the signal from the second user equipment is received.

Claims

1. A method of performing transmission and reception related to D2D (device-to-device) communication, which is performed by a first UE in a wireless communication system, comprising the steps of:

stopping uplink transmission on a first band for a prescribed time period and searching for a signal transmitted by a second UE; and

if the signal transmitted by the second UE is searched, performing a report to a third UE,

wherein the report comprises information on whether the second UE exists and information on a band on which the signal is received from the second UE.

2. The method of claim 1, wherein the information on the band comprises a request for restricting scheduling for the first UE on the band on which the signal is received from the second UE.

3. The method of claim 1, wherein if the signal transmitted by the second UE is searched, the first UE reduces uplink transmit power.

4. The method of claim 1, wherein if the signal transmitted by the second UE is searched, a resource use of a boundary part among the first band is restricted.

5. The method of claim 1, wherein searching for the signal transmitted by the second UE is indicated by downlink control information received from the third UE.

6. The method of claim 5, wherein the prescribed time period corresponds to a subframe appearing after 4 subframes from a subframe in which the downlink control information is received.

7. The method of claim 6, wherein a reception confirmation response configured to be transmitted in the subframe corresponding to the prescribed time period is bundled in a predetermined subframe.

8. The method of claim 6, wherein the third UE considers all reception confirmation responses configured to be transmitted in the subframe corresponding to the prescribed time period as ACK.

9. The method of claim 1, wherein the signal transmitted by the second UE corresponds to one of a sounding reference signal, a random access preamble, a D2D synchronization signal and a discovery signal.

10. The method of claim 1, wherein the report comprises information on the count of hops of the signal transmitted by the second UE hopped from a synchronization cluster header located at the outside of coverage.

11. The method of claim 1, wherein a parameter related to transmission of a sounding reference signal or a random access preamble is shared between the first UE and the second UE by the third UE.

12. The method of claim 1, wherein if the first UE corresponds to a UE in idle state, the search is indicated by a paging signal.

13. The method of claim 1, wherein the second UE corresponds to a UE operating on a second band corresponding to a band related to public safety.

14. The method of claim 13, wherein the first band and the second band are different from each other.

15. The method of claim 12, wherein the signal transmitted by the second UE corresponds to an emergency signal.

16. A first UE performing transmission and reception related to D2D (device-to-device) communication in a wireless communication system, comprising:

a reception module; and

a processor, the processor configured to stop uplink transmission on a first band for a prescribed time period and search for a signal transmitted by a second UE, the processor, if the signal transmitted by the second UE is searched, configured to perform a report to a third UE,

wherein the report comprises information on whether the second UE exists and information on a band on which the signal is received from the second UE.