Method and apparatus for performing handover procedure in wireless communication system
First Claim
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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 indicator, which indicates desire for a handover but does not indicate a type of the handover, from a relay node (RN) through a second X2 interface between the RN and the donor BS;
determining the type of the handover according to whether a first X2 interface between the donor BS and a target BS is available or not;
if it is determined that the first X2 interface between the donor BS and the target BS is available, transmitting an X2 handover request message to the target BS via the first X2 interface;
if it is determined that the first X2 interface between the donor BS and the target BS is not available, transmitting an S1 handover required message to a mobility management entity (MME); and
transmitting a handover response message to the RN,wherein the handover response message is a handover request admission message if the handover to the target BS is available, andwherein the handover response message is a handover preparation failure message if the handover to the target BS is not available.
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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.
13 Citations
9 Claims
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1. A method of performing a handover procedure by a donor base station (BS) in a wireless communication system, the method comprising:
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receiving a handover indicator, which indicates desire for a handover but does not indicate a type of the handover, from a relay node (RN) through a second X2 interface between the RN and the donor BS; determining the type of the handover according to whether a first X2 interface between the donor BS and a target BS is available or not; if it is determined that the first X2 interface between the donor BS and the target BS is available, transmitting an X2 handover request message to the target BS via the first X2 interface; if it is determined that the first X2 interface between the donor BS and the target BS is not available, transmitting an S1 handover required message to a mobility management entity (MME); and transmitting a handover response message to the RN, wherein the handover response message is a handover request admission message if the handover to the target BS is available, and wherein the handover response message is a handover preparation failure message if the handover to the target BS is not available. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A donor base station (BS) in a wireless communication system, the donor BS comprising:
a processor configured for; receiving a handover indicator, which indicates desire for a handover but does not indicate a type of the handover, from a relay node (RN) through a second X2 interface between the RN and the donor BS; determining the type of the handover according to whether an X2 interface between the donor BS and a target BS is available or not; if it is determined that the first X2 interface between the donor BS and the target BS is available, transmitting an X2 handover request message to the target BS via the first X2 interface; if it is determined that the first X2 interface between the donor BS and the target BS is not available, transmitting an S1 handover required message to a mobility management entity (MME); and transmitting a handover response message to the RN, wherein the handover response message is a handover request admission message if the handover to the target BS is available, and wherein the handover response message is a handover preparation failure message if the handover to the target BS is not available. - View Dependent Claims (8, 9)
Specification