Patent ID: 8711759
Filing Date: 2014-04-29
Classification: H04B,H04W

Abstract:
1. A method of communicating from a remote to a hub by way of a satellite, the satellite being operable to bi-directionally communicate with the hub and the remote, the hub having assigned a timeslot for communication with the remote, the hub being operable to transmit a request for a drift delay to the remote by way of the satellite and to transmit an estimated propagation delay to the remote by way of the satellite, the drift value being based on a difference between an initial timing reference and a subsequent timing reference as a result of a change of position of the satellite, said method comprising: determining, at the remote, a first remote offset time for communication with the hub by way of the satellite at a first time; determining, at the remote, a second remote offset time for communication with the hub by way of the satellite at a second time; determining, at the remote, a drift delay based on the first remote offset time and the second remote offset time; receiving, at the remote, the request for the drift value; transmitting, from the remote, the drift delay to the hub by way of the satellite; receiving, at the remote, the estimated propagation delay; and generating, at the remote, a third remote offset time based on the second remote offset time and the estimated propagation delay.