Patent ID: 6961362
Filing Date: 2005-11-01
Classification: H04B,H04W

Abstract:
1. A communication system for performing code-division multiple access communications between a mobile station and a base station wherein; said base station comprises: base station receiving means for receiving signals from said mobile station and outputting a first reception signal; interference canceling means for canceling a multiple access interference signal contained in said first reception signal; interference cancellation effect estimating means for estimating a post-interference cancellation signal-to-interference power ratio of said first reception signal which is currently being received; first signal-to-interference power ratio measuring means for determining the signal-to-interference power ratio of said first reception signal; second signal-to-interference power ratio measuring means for determining the signal-to-interference power ratio of said first reception signal after interference cancellation by said interference canceling means; wherein said interference cancellation effect estimating means estimates the post-interference cancellation signal-to-interference power ratio for a current reception signal based on the signal-to-interference power ratio of the current reception signal obtained from said first signal-to-interference power ratio measuring means and the post-interference cancellation signal-to-interference power ratio for said first reception signal obtained from said second signal-to-interference power ratio measuring means; control command generating means for generating a power control command by comparing said post-interference cancellation signal-to-interference power ratio determined by said interference cancellation effect estimating means with a target value for power control; and base station transmitting means for transmitting said power control command to said mobile station; and said mobile station comprises; mobile station receiving means for receiving a signal from said base station and outputting a second reception signal; and mobile station transmitting means which adjusts the power of a transmission signal transmitted to said base station based on said power control command contained in said second reception signal.