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Method and system for avoiding bad frequency subsets in a frequency hopping cordless telephone system

  • US 6,480,721 B1
  • Filed: 07/10/1998
  • Issued: 11/12/2002
  • Est. Priority Date: 07/10/1998
  • Status: Expired due to Term
First Claim
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1. A system for avoiding bad frequency subsets in a frequency hopping cordless telephone system, the system comprising:

  • a plurality of handsets; and

    a base station communicating with the handsets using frequencies selected from active frequency subsets, the base station avoiding bad frequency subsets by;

    monitoring an air interface between the base station and the handsets for errors in active frequency subsets;

    counting errors in each active frequency subset during a short-term interval using an associated short-term error counter and during a long-term interval using an associated long-term error counter;

    evaluating, after each short-term interval, whether any of the short-term error counters has a value that is greater than a defined threshold;

    evaluating, after each long-term interval, whether any of the long-term error counters has a value greater than an error count for a blocked frequency subset; and

    substituting a blocked frequency subset for an active frequency subset if an associated short-term error counter is greater than the defined threshold or if a long-term error counter is greater than the error count for a blocked frequency subset.

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