Method and Apparatus for Performing Handover Procedure in Wireless Communication System

• US 20130003648A1
• Filed: 05/13/2011
• Published: 01/03/2013
• Est. Priority Date: 05/14/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Hahn, Gene Beck, Xu, Jian, Yi, Seung June, Lee, Young Dae
• Granted Patent: US 9,031,039 B2
• Time in Patent Office: Days
• US Class Current: 370/315
• CPC Class Codes: H04B 7/026 Co-operative diversity, e.g. using fixed or mobile stations as relays
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04W 36/0005 Control or signalling for completing the hand-off
• CPC Class Codes: H04W 36/0011 for data sessions of end-to-end connection
• CPC Class Codes: H04W 36/34 Reselection control
• CPC Class Codes: H04W 84/047 using dedicated repeater stations
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user
• CPC Class Codes: H04W 92/20 between access points

Abstract

A method and apparatus of performing a handover procedure in a wireless communication system is provided. The method includes receiving a handover request message from a relay node (RN), and determining whether a first X2 interface between the donor BS and a target BS is available or not.

Claims

1. A method of performing a handover procedure by a donor base station (BS) in a wireless communication system, the method comprising:

receiving a handover request message from a relay node (RN); and

determining whether a first X2 interface between the donor BS and a target BS is available or not.

2. The method of claim 1, further comprising:

transmitting an X2 handover request message to the target BS if the first X2 interface between the donor BS and the target BS is available.

3. The method of claim 1, further comprising:

transmitting an S1 handover required message to a mobility management entity (MME) if the first X2 interface between the donor BS and the target BS is not available.

4. The method of claim 1, wherein the RN receives a measurement report from a user equipment.

5. The method of claim 1, wherein the handover request message includes an indicator indicating the desire for a handover.

6. The method of claim 1, wherein the handover request message includes information on the target BS.

7. The method of claim 1, wherein the handover request message is received through a second X2 interface between the RN and the donor BS.

8. The method of claim 1, further comprising:

transmitting an X2 connection request message to the target BS if the first X2 interface between the donor BS and the target BS is not available.

9. The method of claim 8, further comprising:

receiving an X2 connection response message from the target BS if the first X2 interface between the donor BS and the target BS is able to be setup.

10. The method of claim 8, further comprising:

receiving an X2 connection failure message from the target BS if the first X2 interface between the donor BS and the target BS is not able to be setup.

11. A donor base station (BS) in a wireless communication system, the donor BS comprising:

a radio frequency (RF) unit; and

a processor, coupled to the RF unit, and configured for;

receiving a handover request message from a relay node (RN), determining whether an X2 interface between the donor BS and a target BS is available or not.

12. The donor BS of claim 11, wherein the processor is further configured for:

transmitting an X2 handover request message to the target BS if the X2 interface between the donor BS and the target BS is available.

13. The donor BS of claim 11, wherein the processor is further configured for:

transmitting an S1 handover required message to a mobility management entity (MME) if the X2 interface between the donor BS and the target BS is not available.

14. The donor BS of claim 11, wherein the processor is further configured for:

transmitting an X2 connection request message to the target BS if the X2 interface between the donor BS and the target BS is not available.

15. The donor BS of claim 14, wherein the processor is further configured for:

receiving an X2 connection response message from the target BS if the X2 interface between the donor BS and the target BS is able to be setup.