Patent ID: 6480721
Filing Date: 2002-11-12
Classification: H04B

Abstract:
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.