Patent ID: 6539004
Filing Date: 2003-03-25
Classification: H04J

Abstract:
A method of adjusting the timing of frames for transmission to a radio transmitter site of a cellular wireless communications system, comprising the steps of:said radio transmitter site receiving signals representing an accurate source of time; from said signals representing an accurate source of time, deriving timing for a periodic multi-frame timing signal having an indication of the beginning of each frame of the multi-frame signal, and a sequence number within said mutli-frame sequence representing an identity of said each frame within the periodic multi-frame timing signal; transmitting from a source of a periodic sequence of frames, a first frame with a sequence number and a transmit time for said first frame in said periodic sequence; at said radio transmitter site, calculating a frame offset and a time offset between an actual time of reception of said first frame and a desired time of reception for a frame having a sequence number received with said first frame; transmitting said frame offset and said time offset to said source of frames; at said source of frames, adjusting a sequence number within a multi-frame sequence and a time of transmittal from said source of frames to conform to said frame and said time offset; whereby subsequent frames are transmitted from said source at a time such that they are received at said radio transmitter site at a desired time of arrival for a specified time of transmission.