Patent ID: 6163707
Filing Date: 2000-12-19
Classification: H04W

Abstract:
A method of controlling the transmission power of a radiotelephone in a code division multiple access communication system, the method comprising the steps of:receiving at a base station a spread spectrum communication signal transmitted by a radio telephone over a time-varying reverse link communication channel;demodulating and decoding the communication signal;estimating a .sup.E w/I.sub.0 ratio for the received signal;comparing the .sup.E w/I.sub.0 ratio to a predetermined threshold to generate an error signal, the threshold being that which is required to maintain a selected frame error rate;anticipating changers in the error signal based on communication channel statistics over a predetermined time interval;modifying the error signal based on the anticipation of changes in the communication channel;generating a power control command that represents the modified error signal, the command constituting one or more power control bits included in one or more data frames; andtransmitting the power control bits in a spread spectrum signal over the command channel's forward link to the radiotelephone for processing so that the .sup.E w/I.sub.0 of the communication signals transmitted by the radiotelephone is accordingly adjusted.