Method for direct communication between terminals in wireless communication system and device therefor

Patent metadata

Field	Value
Publication number	US-10499452-B2
Application number	US-201615765640-A
Country	US
Kind code	B2
Filing date	Oct 26, 2016
Priority date	Oct 26, 2015
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

Disclosed are a method for direct communication and a relay UE, the method including: in the process of configuring a direct communication with a remote UE, receiving, from the remote UE, a direct communication request message including information on a maximum inactivity period; starting a timer corresponding to the maximum inactivity period when data transmission or signaling via the direct connection with the remote UE is completed; and if no message is received from the remote UE by the time the timer expires, locally releasing the direct connection with the remote UE.

First claim

What is claimed is:

1. A method of performing a direct communication, which is performed by a relay user equipment (UE) corresponding to a proximity service-enabled user equipment (ProSe-enabled UE) with a remote UE in a wireless communication system, the method comprising:
receiving from the remote UE, a direct communication request message comprising information on an inactivity timer value during a direct link setup procedure with the remote UE;
based on that there is no signaling via a direct link established with the remote UE, starting a timer with the inactivity timer value; and
based on that no communication occurs until the timer expires, locally releasing the direct link established with the remote UE.

2. The method of claim 1 , wherein, based on that there is a signaling message transmitted via the direct link before the timer expires, the relay UE stops the timer and configures the timer as an initial value.

3. The method of claim 1 , wherein the inactivity timer value is determined based on a transmission period of a direct communication keepalive message transmitted by the remote UE, a retransmission time interval, and a maximally allowed retransmission count.

4. The method of claim 3 , wherein the inactivity timer value is determined based on an equation,
‘Inactivity timerkeep’≥‘transmission period of keepalive message’+‘retransmission time interval’*‘maximum number of allowed retransmissions’  [Equation]

wherein the ‘Inactivity timerkeep’ corresponds to a maximum inactivity period, wherein the ‘transmission period of keepalive message’ corresponds to a transmission period of the direct communication keepalive message, wherein the ‘retransmission time interval’ corresponds to a retransmission time interval of the direct communication keepalive message, and wherein the ‘maximum number of allowed retransmissions’ corresponds to a maximally allowed retransmission count of the direct communication keepalive message.

5. The method of claim 1 , wherein the relay UE receives a direct communication keepalive message from the remote UE.

6. A relay user equipment (UE) corresponding to a proximity service-enabled user equipment (ProSe-enabled UE) performing direct communication with a remote UE in a wireless communication system, the relay UE comprising:
a transmitter;
a receiver; and
a processor configured to operate in a manner of being connected with the transmitter and the receiver,
wherein the processor:
controls the receiver to receive, from the remote UE, a direct communication request message comprising information on an inactivity timer value during a direct link setup procedure with the remote UE,
based on that there is no signaling via a direct link established with the remote UE, starts a timer with the inactivity timer value, and
based on that no communication occurs until the timer expires, locally releases the direct link established with the remote UE.

7. The relay UE of claim 6 , wherein, based on that there is a signaling message transmitted via the direct link before the timer expires, the relay UE stops the timer and configures the timer as an initial value.

8. The relay UE of claim 6 , wherein the inactivity timer value is determined based on a transmission period of a direct communication keepalive message transmitted by the remote UE, a retransmission time interval, and a maximally allowed retransmission count.

9. The relay UE of claim 8 , wherein the inactivity timer value is determined based on an equation,
‘Inactivity timerkeep’≥‘transmission period of keepalive message’+‘retransmission time interval’*‘maximum number of allowed retransmissions’  [Equation]

wherein the ‘Inactivity timerkeep’ corresponds to a maximum inactivity period, wherein the ‘transmission period of keepalive message’ corresponds to a transmission period of the direct communication keepalive message, wherein the ‘retransmission time interval’ corresponds to a retransmission time interval of the direct communication keepalive message, and wherein the ‘maximum number of allowed retransmissions’ corresponds to a maximally allowed retransmission count of the direct communication keepalive message.

10. The relay UE of claim 6 , wherein the relay UE receives a direct communication keepalive message from the remote UE.

Assignees

• Lg Electronics Inc

Inventors

• Kim Taehun
• Jung Sunghoon
• Kim Laeyoung
• Kim Jaehyun

Classifications

• H04W88/04 Primary

  adapted for relaying to or from another terminal or user · CPC title

• H04W76/14 Primary

  Direct-mode setup · CPC title

• H04W48/16

  Discovering, processing access restriction or access information · CPC title

• H04W76/28

  Discontinuous transmission [DTX]; Discontinuous reception [DRX] · CPC title

• H04W76/38 Primary

  triggered by timers · CPC title