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GSM channel tracking

  • US 9,066,270 B2
  • Filed: 03/15/2013
  • Issued: 06/23/2015
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A monitoring instrument, comprising:

  • a processor; and

    a memory, wherein the memory has stored thereon instructions that, when executed by the processor, cause the processor;

    to determine a correspondence between a Global System for Mobile Communications (GSM) air channel frequency designator and an Abis signaling channel, bydetecting a first channel activation message on the Abis signaling channel;

    detecting, during a first time interval following the first channel activation message, a first set of one or more frequency designators;

    detecting a second channel activation message on the Abis signaling channel;

    detecting, during a second time interval following the second channel activation message, a second set of one or more frequency designators; and

    forming a list of candidate frequency designators comprising frequency designators included in both;

    the first set of one or more frequency designators, andthe second set of one or more frequency designators; and

    to use the correspondence established when the list of candidate frequency designators contains exactly one frequency designator to identify a post-handover Abis signaling channel corresponding to a post-handover frequency designator.

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