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Handover following in a mobile radio system

  • US 5,884,175 A
  • Filed: 05/05/1997
  • Issued: 03/16/1999
  • Est. Priority Date: 05/03/1996
  • Status: Expired due to Term
First Claim
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1. In a mobile radio system, a method of following across a handover a communication transaction between a mobile station and a fixed network part organized as a plurality of radio cells, the mobile radio system including a plurality of signaling paths for passing signaling messages to and from the mobile station with the particular signaling path in use depending on which one of said radio cell is being used for communication with the mobile station, this latter cell being changed by a said handover which, where it involves a change in said signaling path, results in at least one predetermined parameter appearing with the same value in said signaling messages on both the old and the new paths;

  • said method comprising the steps of;

    (a) monitoring a first said signaling path to detect signaling messages related to a first said communication transaction that is to be handed-over away from a cell served by that signaling path, and extracting from these messages the value of said at least one predetermined parameter;

    (b) monitoring a second said signaling path to detect signaling messages relating to a second said communication transaction subject to hand-over towards a cell served by that signaling path, and extracting from these messages the value of said at least one predetermined parameter;

    (c) comparing the values of the said at least one predetermined parameter extracted in steps (a) and (b) and if these values are the same, determining that said first and second communication transactions are the same transaction.

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