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System and method for implementing a handoff in a traffic state in a broadband wireless access communication system

  • US 7,369,853 B2
  • Filed: 03/05/2004
  • Issued: 05/06/2008
  • Est. Priority Date: 03/08/2003
  • Status: Expired due to Fees
First Claim
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1. A method of implementing a handoff from a serving base station (BS) to one of a plurality of neighbor BSs by a subscriber station (SS) in a broadband wireless access (BWA) communication system including the serving BS for servicing the SS in at least one of a plurality of sub-carrier frequency bands, and the plurality of neighbor BSs adjacent to the serving BS, comprising the steps of:

  • receiving information about the neighbor BSs from the serving BS;

    measuring CINRs (Carrier to Interference and Noise Ratios) of frequency band signals from the neighbor BSs;

    selecting a target BS from among the neighbor BSs having a highest of the measured CINRs;

    requesting a handoff to the target BS from the serving BS;

    transitioning to a frequency band of the target BS;

    synchronizing with the target BS;

    assigning the SS to a ranging information region for an initial connection from the target BS,transmitting ranging information for the initial connection to the target BS in the assigned ranging information region;

    receiving from the target BS connection identification (ID) information between the target BS and the SS;

    transmitting a handoff registration request message to the target BS according to the connection ID information; and

    receiving a response message for the handoff registration request message from the target BS.

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