Patent ID: 8275406
Filing Date: 2012-09-25
Classification: H04L,H04W

Abstract:
1. A method in a base station for jointly controlling sub-channel transmission power and assigned codec modes for a first mobile station and a second mobile station sharing the same frequency and time slot in a radio telecommunication system, said method comprising the steps of: allocating initial portions of the sub-channel transmission power to the first and second mobile stations and assigning initial codec modes to the first and second mobile station; transmitting speech frames to the first and second mobile station; receiving measured speech quality indications from the first mobile station and the second mobile station; determining by the base station, new codec modes and a new allocation of sub-channel transmission power for the first and second mobile station based on the measured speech quality indications; subsequently receiving codec mode requests from the first and second mobile stations; upon receiving the codec mode requests from the first and second mobile stations, determining updated speech quality estimates for the first and second mobile stations based each mobile station's requested codec mode; determining by the base station, whether the updated speech quality estimates are acceptable and balanced at the first and second mobile stations; upon determining that the updated speech quality estimates are acceptable and balanced, applying by the base station, the requested codec modes to a next speech frame while maintaining the initial allocation of transmitter power; and upon determining that the updated speech quality estimates are not acceptable at one of the mobile stations or are not balanced, applying by the base station, the requested codec modes to the next transmission and shifting the transmitter power allocation from the mobile station with better speech quality to the mobile station with poorer speech quality.