A method for adapting at least one system parameter (i) defining a connection between a transmitter unit and a receiver unit in a radio based communications system, wherein an adaptation frequency at which the system parameter (i) is adapted is dependent on at least one derivative of order n, n=0; 1,...http://www.google.com.tw/patents/US7769350?utm_source=gb-gplus-share專利 US7769350 - System and method for adapting system parameters in radio based communications systems