Patent ID: 6728217
Filing Date: 2004-04-27
Classification: H04L,H04W

Abstract:
A telecommunications system for maintaining the quality of transparent and non-transparent data calls within a cellular network, comprising:a mobile station within said cellular network for engaging in a data call over an air interface at a high data rate; a base station controller in wireless communication with said mobile station via said air interface for analyzing quality measurements indicating the quality of said data call over said air interface, comparing said quality measurements with an upper quality threshold and requesting said mobile station to change to a low data rate in response to said quality measurements exceeding said upper quality threshold, said low data rate being lower than said high data rate, said base station controller further for receiving additional quality measurements after said mobile station has changed to said low data rate, comparing said additional quality measurements to a lower quality threshold and requesting said mobile station to change back to said high data rate in response to said additional quality measurements dropping below said lower quality threshold; and a timer within said base station controller, said timer being initiated when said mobile station changes to said low data rate, said lower quality threshold being at a low value during said timer period, said lower quality threshold being incrementally increased to an ideal value upon expiration of said timer.