Apparatus and method for supporting intra-base station handover in a multi-hop relay broadband wireless communication system
First Claim
1. A multi-hop relay wireless communication system comprising:
- a base station (BS) configured to;
determine, based on a measurement report received from a mobile station (MS), that there is a need for the MS to handover from a serving relay station (RS) to a target RS,determine whether the serving RS and the target RS exist within the BS,generate a handover command message comprising an indicator that indicates whether the serving RS and the target RS exist within the BS, andtransmit the handover command message to the serving RS,wherein the serving RS is configured to receive the handover command message from the BS, and transmit the handover command message to the MS, andwherein the MS is configured to;
receive the handover command message from the serving RS,recognize an ability for the MS to use a control information for a communication with the target RS, wherein the control information has previously been used in a communication with the serving RS, based on the indicator of the handover command message, andupon recognition of the ability for the MS to use the control information for the communication with the target RS, use a key in the target RS, wherein the key was previously used in a prior communication.
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Accused Products
Abstract
An apparatus is capable of supporting an intra-BS handover of a Mobile Station (MS) that can distinguish a Relay Station (RS) and a Base Station (BS) in a multi-hop relay broadband wireless communication system. A handover of an MS in a multi-hop relay wireless communication system includes receiving a neighbor advertisement message. When a handover command message that initiates a handover to a target node is received, information on a target node is acquired, and an upper BS of the target node is identified. When the identified upper BS of the target node is the same as an upper BS of the serving node, control information that has been previously used in a serving node is used in the target node, and communication with the target node is performed.
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Citations
10 Claims
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1. A multi-hop relay wireless communication system comprising:
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a base station (BS) configured to; determine, based on a measurement report received from a mobile station (MS), that there is a need for the MS to handover from a serving relay station (RS) to a target RS, determine whether the serving RS and the target RS exist within the BS, generate a handover command message comprising an indicator that indicates whether the serving RS and the target RS exist within the BS, and transmit the handover command message to the serving RS, wherein the serving RS is configured to receive the handover command message from the BS, and transmit the handover command message to the MS, and wherein the MS is configured to; receive the handover command message from the serving RS, recognize an ability for the MS to use a control information for a communication with the target RS, wherein the control information has previously been used in a communication with the serving RS, based on the indicator of the handover command message, and upon recognition of the ability for the MS to use the control information for the communication with the target RS, use a key in the target RS, wherein the key was previously used in a prior communication. - View Dependent Claims (2, 3, 4, 5)
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6. A method for performing a handover in a multi-hop relay wireless communication system including a base station (BS), a serving relay station (RS), a target RS, and a mobile station (MS), the method comprising:
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determining, at the BS based on a measurement report received from a mobile station (MS), that there is a need for the MS to handover from the serving RS to the target RS; determining, at the BS, whether the serving RS and the target RS exist within the BS; generating, at the BS, a handover command message comprising an indicator that indicates whether the serving RS and the target RS exist within the BS; transmitting, at the BS, the handover command message to the serving RS; receiving, at the serving RS, the handover command message from the BS; transmitting, at the serving RS, the handover command message to the MS; receiving, at the MS, the handover command message from the serving RS; recognizing, at the MS, an ability for the MS to use a control information for a communication with the target RS, the control information that has previously been used in a communication with the serving RS, based on the indicator of the handover command message; and upon recognition of the ability for the MS to use the control information for the communication with the target RS, using, at the MS, a key to use in the target RS, wherein the key was previously used in a prior communication. - View Dependent Claims (7, 8, 9, 10)
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Specification