Method and apparatus for handling radio resources for device-to-device operation in wireless communication system

Patent metadata

Field	Value
Publication number	US-2016309377-A1
Application number	US-201415024791-A
Country	US
Kind code	A1
Filing date	Oct 2, 2014
Priority date	Oct 3, 2013
Publication date	Oct 20, 2016
Grant date	—

Abstract

A method and apparatus for handling radio resources upon mobility in a wireless communication system is provided. In one embodiment, a user equipment (UE) receives information on radio resources allowed for a device-to-device (D2D) operation in a target cell during a handover procedure, and perform the D2D operation in the target cell based on received information on radio resources. In another embodiment, a UE performs a handover procedure or a connection re-establishment procedure, suspends using D2D resources, and resumes suspended D2D resources.

First claim

1 . A method for performing, by a user equipment (UE), a device-to-device (D2D) operation in a wireless communication system, the method comprising:
receiving information on radio resources allowed for a D2D operation in a target cell during a handover procedure; and performing the D2D operation in the target cell based on received information on radio resources.

2 . The method of claim 1 , wherein the information on radio resources is received via a handover command message from the target cell.

3 . The method of claim 1 , wherein the information on radio resources indicate radio resources authorized by a network for D2D transmission.

4 . The method of claim 3 , wherein the D2D transmission includes at least one of transmission of Internet protocol (IP) packet for D2D communication or D2D discovery signal, or transmission of media access control (MAC) protocol data unit (PDU) for D2D discovery signal.

5 . The method of claim 1 , wherein the information on radio resources indicate a time period or a pattern of the time period in which the D2D operation is able to be performed.

6 . The method of claim 5 , wherein the time period is one of a time slot or a subframe.

7 . The method of claim 1 , wherein the information on radio resources includes information on radio resources for the D2D operation of a neighbor cell of the target cell.

8 . A user equipment (UE) in a wireless communication system, the UE comprising:
a radio frequency (RF) unit for transmitting or receiving a radio signal; and a processor coupled to the RF unit, and configured to: receive information on radio resources allowed for a device-to-device (D2D) operation in a target cell during a handover procedure; and perform the D2D operation in the target cell based on received information on radio resources.

9 . A method for performing, by a user equipment (UE), device-to-device (D2D) operation in a wireless communication system, the method comprising:
performing a handover procedure or a connection re-establishment procedure; suspending using D2D resources; and resuming suspended D2D resources.

10 . The method of claim 9 , wherein the D2D resources are suspended for both D2D transmission and D2D reception.

11 . The method of claim 9 , wherein the D2D resources are suspended only for D2D transmission.

12 . The method of claim 9 , wherein the suspended D2D resources are resumed after a first reconfiguration procedure is performed after the handover procedure or the connection re-establishment procedure is completed.

13 . The method of claim 9 , wherein the suspended D2D resources are resumed after receiving an indication which indicates resuming the suspended D2D resources from a network.

14 . The method of claim 13 , wherein the indication is received via a reconfiguration message.

15 . The method of claim 9 , wherein the suspended D2D resources are resumed after the connection re-establishment procedure is completed.

Assignees

• Lg Electronics Inc

Inventors

• Jung Sunghoon
• Lee Youngdae

Classifications

• H04W76/028

  Electricity · mapped topic

• H04W8/005

  Discovery of network devices, e.g. terminals · CPC title

• H04W36/0072 Primary

  of resource information of target access point · CPC title

• H04W76/043

  Electricity · mapped topic

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title