In the method of making downlink operational measurements a measurement request from one of a main controller and a first base station is sent to at least a second base station. The measurement request requests the second base station to instruct mobile terminals in communication therewith to make operation...http://www.google.com.au/patents/US6862447?utm_source=gb-gplus-sharePatent US6862447 - Method of making downlink operational measurements in a wireless communication system
