Apparatus and method for performing handover for multi-hop system in a broadband wireless access communication network
First Claim
1. A handover system in a wireless access communication network, comprising:
- a Base Station (BS) for periodically broadcasting a message including information about neighboring BSs and neighboring Relay Stations (RSs);
an RS for receiving the broadcast message from the BS, including information about a new BS or RS in the broadcast message, when the new BS or RS needs to be added; and
a Mobile Station (MS) for receiving the broadcast message from the RS, requesting information about BSs or RSs to which the MS can perform a handover by notifying candidate BSs or RSs for the handover.
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Accused Products
Abstract
A handover apparatus and method for a multi-hop system in a BWA communication network are provided. In a handover system supporting multi-hop system in a BWA communication network, a BS periodically broadcasts a message with neighboring BS/RS information. When a new BS or RS needs to be added, an RS periodically broadcasts the broadcast message received from the BS with information about the new BS or RS. An MS receives the broadcast message from the RS and requests information about BSs or RSs to which the MS can perform a handover by notifying candidate BSs or RSs for the handover. The candidate BSs or RSs may include a BS or RS not included in the broadcast message, if the MS detects the BS or RS by scanning. The MS selects a target BS or RS based on the BS or RS information received from the BS, and performs the handover to the target BS or RS.
31 Citations
22 Claims
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1. A handover system in a wireless access communication network, comprising:
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a Base Station (BS) for periodically broadcasting a message including information about neighboring BSs and neighboring Relay Stations (RSs);
an RS for receiving the broadcast message from the BS, including information about a new BS or RS in the broadcast message, when the new BS or RS needs to be added; and
a Mobile Station (MS) for receiving the broadcast message from the RS, requesting information about BSs or RSs to which the MS can perform a handover by notifying candidate BSs or RSs for the handover. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of broadcasting information about neighboring Base Stations (BSs) or neighboring Relay Stations (RSs) in an RS in a wireless access communication network, comprising the steps of:
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receiving a broadcast message from a BS;
determining if there is a neighboring BS or neighboring RS not included in the broadcast message;
updating information about the neighbor BS or neighbor RS in the broadcast message; and
broadcasting the broadcast message periodically. - View Dependent Claims (13)
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14. A handover method for a Mobile Station (MS) in a wireless Access communication network, comprising the steps of:
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receiving a broadcast message and acquiring information about neighboring Base Stations (BSs) or Relay Stations (RSs) from the broadcast message;
determining if there are neighboring BSs or RSs other than the neighboring BSs or RSs included in the broadcast message by scanning;
selecting candidate BSs or RSs from among the neighbor BSs or RSs included in the broadcast message and the scanned neighbor BSs or RSs;
sending, if the candidate BSs or RSs include scanned neighbor BSs or RSs, a handover request message including information about the scanned neighbor BSs or RSs; and
receiving a handover response message for the handover request message, selecting a target BS or RS from among BSs or RSs included in the handover response message, and sending a handover message including the target BS or RS. - View Dependent Claims (15)
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16. A handover method in a Relay Station (RS) in a wireless access communication network, comprising the steps of:
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receiving a handover request message from a Mobile Station (MS);
determining if candidate Base Stations (BSs) or RSs for an MS handover set in the handover request message are BSs or RSs set by a BS, RS, or the MS;
updating information about the candidate BSs or RSs if said devices are set by the RS, including the updated information and an Identifier (ID) of the MS in the handover request message, and sending the handover request message with the updated information and the ID of the MS to the BS;
eliminating the ID of the MS, upon receipt of a response message with the ID of the MS for the handover request message from the BS and sending the response message without the ID of the MS to the MS;
appending the ID of the MS in the handover message, upon receipt of a handover message from the MS and sending the handover message with the ID of the MS to the BS; and
eliminating the ID of the MS from the response message, upon receipt of a response message for the handover message from the BS and sending the response message without the ID of the MS to the MS. - View Dependent Claims (17, 18)
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19. A handover method for a Base Station (BS) in a wireless access communication network, comprising the steps of:
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receiving a handover request message including an Identifier (ID) of a Mobile Station (MS) and sending a response message for the handover request message, including the ID of the MS and information about BSs or Relay Stations (RSs) to which the MS can perform a handover;
receiving a handover message including the ID of the MS, processing the handover of the MS to a target BS or RS indicated by the handover message; and
sending a response message including the result of the handover and the ID of the MS, for the handover message. - View Dependent Claims (20)
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21. A method of transmitting a message in a Base Station (BS) in a Broadband Wireless Access (BWA) communication network supporting a multi-hop system, comprising the steps of:
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appending an Identifier (ID) of a Mobile Station (MS) in a message for the MS; and
sending the message to the MS. - View Dependent Claims (22)
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Specification