Patent ID: 7200171

Claim:
For purposes of selecting an optimal codec mode in a multi-rate service, a method of estimating initial channel quality in a receiver when a new channel is allocated, said method comprising: obtaining channel quality measurements; calculating a carrier-to-interference (C/I) value of the obtained channel quality measurements; dynamically initializing a filter comprised of N taps with the calculated C/I values; and filtering the C/I values to remove randomness thereby providing a better channel quality estimation for use in codec mode selection within the multi-rate service; wherein the step of dynamically initializing the filter with the calculated C/I values comprises: obtaining the number of codec modes for the multi-rate service from a base station that is in communication with the receiver; obtaining threshold and hysteresis values for the codec modes from the base station; obtaining the initial codec mode from the base station; and calculating a C/I value to be used to initialize all N taps of the filter based upon the threshold and hysteresis values of the codec modes together with the initial codec mode.