Patent ID: 8041393
Filing Date: 2011-10-18
Classification: H01Q,H03J

Abstract:
1. A method for controlling operation of an oscillator in a basestation of a cellular communications system, the method comprising: in said basestation, identifying at least one other basestation of the cellular communications system, and requesting a mobile device to report a first measurement of a time difference between frames transmitted from the basestation and the identified other basestation; in said mobile device, making said first measurement, and reporting to said basestation; in said basestation, requesting the mobile device to report a second measurement of the time difference between frames transmitted from the basestation and the identified other basestation; in said mobile device, making said second measurement, and reporting to said basestation; in said basestation, based on said reported first and second measurements, estimating a frequency offset between a signal generated within said basestation and a corresponding signal generated within said other basestation; and applying a frequency control signal to said oscillator based on said estimated frequency offset.