Patent ID: 7289769
Filing Date: 2007-10-30
Classification: H04B

Abstract:
1. A method for operating a UMTS cellular radio communication system which includes a base station having a plurality of antennas and a user station, with the base station supporting an operating state with closed-loop antenna diversity, the method comprising the steps of: emitting, via the base station when in the operating state with closed-loop antenna diversity, at each of the antennas a downlink signal respectively weighted with components of a weighting vector; receiving the downlink signal at the user station; determining, via the user station through measurements on the downlink signal, a determined weighting vector which ensures reception of the downlink signal at the user station; and transmitting, via the user station, back-coupling information in an uplink signal to the base station representing the determined weighting vector, wherein if no back-coupling information transmitted before the interruption is available, the base station weights the downlink signal with a weighting vector determined in advance.