Patent ID: 6826410
Filing Date: 2004-11-30
Classification: H04B,H04L

Abstract:
A method for use in improving reliability and communication quality in a cellular radio communication system which includes at least a first radio base station having associated radio channels with uplinks and downlinks using different carrier frequencies, the method characterized by comprising:determining whether one of a first uplink or a first downlink of a first radio channel is subject to a Rayleigh fading dip, the first radio channel being used during a current communication segment for communications between the first radio base station and a first radio terminal; determining whether to execute a countermeasure in order to counteract the negative influences of Rayleigh fading, if it is determined that one of the first uplink or the first downlink is subject to a Rayleigh fading dip, wherein the determining of whether one of the first uplink or the first downlink is subject to a Rayleigh fading dip includes: obtaining a gain of the first uplink; obtaining a gain of the first downlink; and comparing the gain of the first uplink to the gain of the first downlink in order to deduce whether one of the first uplink or the first downlink is subject to a Rayleigh fading dip, wherein the comparing includes: determining an offset associated with a difference between the gain of the first uplink and the gain of the first downlink during the current communication segment; and determining whether one of the first uplink or the first downlink is subject to a Rayleigh fading dip by monitoring how the difference between the gain of the first uplink and the gain the first downlink deviates from the offset.