Apparatus and method for handover in wireless access communication system
First Claim
1. A communication method of a Relay Station (RS) in a wireless access communication system, the communication method comprising the steps of:
- receiving from a Base Station (BS) a handover request message including a candidate node list;
sending to a Mobile Station (MS) the handover request message; and
receiving from the MS a handover indication message indicating whether to perform a handover.
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Accused Products
Abstract
Provided are an apparatus and a method for handling a handover in multi-hop relay Broadband Wireless Access (BWA) system. In a communication method of a Relay Station (RS) in a multi-hop relay BWA system, a handover request message including a candidate node list is received from a Base Station (BS), the handover request message is sent to a Mobile Station (MS), and a handover indication message is received from the MS, the handover indication message indicating whether to perform a handover. Communication persistence can be provided for the MS having mobile characteristics, and cell load management and RS configuration/arrangement can be easily accomplished.
75 Citations
66 Claims
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1. A communication method of a Relay Station (RS) in a wireless access communication system, the communication method comprising the steps of:
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receiving from a Base Station (BS) a handover request message including a candidate node list;
sending to a Mobile Station (MS) the handover request message; and
receiving from the MS a handover indication message indicating whether to perform a handover. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A communication method of a BS in a wireless access communication system, the communication method comprising the steps of:
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preparing a candidate node list when an MS communicating with an RS has to be handed over;
sending to the MS via the RS a handover request message including the candidate node list; and
receiving from the MS via the RS a handover indication message indicating whether to perform a handover. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A communication method of an RS in a wireless access communication system, the communication method comprising the steps of:
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preparing a candidate node list when an MS communicating with an RS has to be handed over;
sending to the MS a handover request message including the candidate node list; and
receiving from the MS a handover indication message indicating whether to perform a handover. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A communication method of a BS in a wireless access communication system, the communication method comprising the steps of:
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receiving from an RS a message informing of the possibility of handover of an MS;
collecting handover related information from candidate nodes listed in the message; and
sending to the RS a message including the handover related information. - View Dependent Claims (32, 33)
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34. A method of handling a handover in a communication system, the method comprising the steps of:
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preparing a candidate node list at a serving BS by collecting handover related information from neighboring nodes for the handover of the MS when an MS has to be handed over;
transmitting to an RS communicating with the MS a handover request message including the candidate node list from the serving BS;
transmitting from the RS to the MS the handover request message, and transmitting from the MS to the RS a handover indication message indicating whether to perform the handover. - View Dependent Claims (35, 36, 37, 38)
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39. A method of handling a handover in a communication system, the method comprising the steps of:
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preparing a candidate node list at a serving BS by collecting handover related information from neighboring nodes for the handover of the MS when an MS has to be handed over;
transmitting from the RS to the MS a handover request message including the candidate node list; and
transmitting from the MS to the RS a handover indication message indicating whether to perform the handover. - View Dependent Claims (40, 41)
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42. A communication method of an RS in a communication system, the communication method comprising the steps of:
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forwarding from a BS to an MS a handover request message;
forwarding from the MS to the BS a handover indication message indicating whether to perform a handover; and
releasing context information of the MS when a message informing of the handover of the MS is received from the BS.
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43. An apparatus for an RS in a communication system, the apparatus comprising:
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a message generator for generating a handover request message including a candidate node list;
a transmitter for converting the handover request message from the message generator into a radio specification format so as to transmit the converted handover request message to an MS; and
a message processor for processing a handover indication message received from the MS in response to the handover request message, the handover indication message including information about whether to perform a handover. - View Dependent Claims (44, 45, 46)
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47. A communication method of a Base Station (BS) in a wireless access communication system, the communication method comprising the steps of:
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if an handover of a Mobile Station (MS) communicating with a Relay Station (RS) is necessary, constructing a candidate node list and determining a handover direction;
transmitting to the RS a handover command message including the candidate node list and the handover direction information; and
receiving from the MS via the RS a handover indication message indicating whether to perform a handover. - View Dependent Claims (48, 49, 50, 51, 52)
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53. A communication method of a Relay Station (RS) in a wireless access communication system, the communication method comprising the steps of:
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receiving from a Base Station (BS) a handover command message indicating a handover direction;
constructing a handover request message or a handover response message in accordance with the handover direction information; and
transmitting the constructed message to a Mobile Station (MS). - View Dependent Claims (54, 55, 56, 57, 58, 59)
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60. A method of handling a handover in a communication system, the method comprising the steps of:
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preparing a candidate node list at a serving BS and determining a handover direction when an MS has to be handed over;
transmitting to an RS a handover command message including the candidate node list and the handover direction information;
preparing at the RS a handover request message using the information of the handover command message;
transmitting from the RS to the MS the handover request message; and
transmitting to the BS via the RS a handover indication message indicating whether to perform the handover. - View Dependent Claims (61, 62, 63, 64, 65, 66)
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Specification