Patent ID: 7082108
Filing Date: 2006-07-25
Classification: H04W

Abstract:
1. A transmission power control method in a UE (User Equipment) for a TDD (Time Division Duplexing) CDMA (Code Division Multiple Access) communication system which transmits a stream of frames from a Node B to the UE, each of the frames including a field indicating power level information transmitted from the Node B and a time slot field for allocating a TPC (Transmission Power Control) command and transmission data from the Node B to the UE, wherein the UE receives data transmitted from the Node B, allocated to a time slot field in a following frame after a transmission pause period where no transmission data exists in the time slot fields in specific frames among the stream of frames transmitted from the Node B to the UE, comprising the steps of: measuring a propagation loss between the Node B and the UE by receiving the power level information at a specific time slot in the transmission pause period; measuring an interference noise of the Node B by receiving a specific channel signal broadcast by the Node B; determining uplink transmission power by summing up (i) values determined by applying a weight based on a length of the transmission pause period to the currently measured propagation loss and an average propagation loss between the Node B and the UE during the transmission pause period, (ii) a predetermined target signal-to-interference ratio (SIR), (iii) the measured interference noise of the Node B, and (iv) an offset for compensating for the propagation loss error; and transmitting a TPC command corresponding to the determined uplink transmission power to the Node B.