Patent ID: 6603979
Filing Date: 2003-08-05
Classification: H04W

Abstract:
A method of re-synchronizing a communication device comprised in a cellular communication system, said method comprising:initially synchronizing a master timer of said communication device to a first timing reference of a radio base station comprised in said cellular communication system; determining and storing a first channel profile of received multi-path signals relative to said initial synchronization; entering a sleep mode after said initial synchronization, in said sleep mode switching off a second timing reference that controls said master timer; from said sleep mode, entering a receive mode, in said receive mode, switching on said second timing reference; determining a second channel profile of received multi-path signals; deriving a timing offset signal from a best fit obtained by fitting said first channel profiled to said second channel profile; and re-synchronizing said master timer on the basis of said derived timing offset signal; wherein said fitting is a mean-square error fitting method.