Method and apparatus for transmitting/receiving signal related to device-to-device communication in wireless communication system

Patent metadata

Field	Value
Publication number	US-2016007383-A1
Application number	US-201414771461-A
Country	US
Kind code	A1
Filing date	Mar 6, 2014
Priority date	Mar 7, 2013
Publication date	Jan 7, 2016
Grant date	—

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.

First claim

What is claimed is:

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.

Assignees

• Lg Electronics Inc

Inventors

• Chae Hyukjin
• Lee Seungmin
• Kim Hakseong
• Seo Hanbyul

Classifications

• H04W68/005

  Transmission of information for alerting of incoming communication · CPC title

• H04W84/18

  Self-organising networks, e.g. ad-hoc networks or sensor networks · CPC title

• H04W76/50 Primary

  for emergency connections · CPC title

• H04W76/14

  Direct-mode setup · CPC title

• H04W72/121

  for groups of terminals or users · CPC title