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Method and apparatus for soft handoff between base stations using different frame formats

  • US 7,336,954 B2
  • Filed: 05/17/2002
  • Issued: 02/26/2008
  • Est. Priority Date: 07/05/2001
  • Status: Expired due to Fees
First Claim
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1. In a wireless communication system, a method for soft handoff between first and second base stations using different signaling frame formats, comprising:

  • initiating a soft handoff from a first base station to a second base station, wherein a protocol data unit format revision in use by the first base station is lower than a protocol data unit format revision in use by the second base station;

    configuring the second base station to communicate at the lower protocol data unit format revision of the first base station;

    directing a mobile station to upgrade, at an action time, to a mobile protocol data unit format revision associated with the higher protocol data unit format revision in use by the second base station before configuration;

    completing the soft handoff to the second base station;

    reconfiguring the second base station to communicate at the higher protocol data unit format revision in use by the second base station before configuration; and

    exchanging signaling frames between the mobile station and the second base station using the higher protocol data unit format revision in use by the second base station before configuration.

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