Methods and apparatus for providing base station position information and using position information to support timing and/or frequency corrections

摘要

A wireless terminal receives base station position over an airlink, determines its relative position with respect to the base station and determines a timing adjustment correction. The wireless terminal applies the determined timing correction to control uplink signaling timing and achieve synchronization at the base station's receiver. The wireless terminal determines its relative velocity with respect to the base station and determines a Doppler shift adjustment which it adds to the uplink carrier frequency or to its baseband signal. A wireless terminal determines the position of a moving base station and determines timing and/or frequency corrections. Base station position is determined from the current time and stored information correlating the base station position with time, e.g., for a geo-synchronous satellite. Base station position information is determined from broadcast information, e.g., GPS base station position, for an aircraft base station. Wireless terminals may be mobile and include a GPS receiver for WIRELESS TERMINAL position determination.

主权项

1. A wireless terminal comprising:
a receiver for receiving, over an airlink, a signal from a base station communicating a base station determined current base station position; a relative distance determination module for determining the relative distance between the base station and the wireless terminal based on the communicated current base station position; a timing synchronization module for performing a timing adjustment operation as a function of the determined relative distance; a relative velocity determination module for determining the relative velocity of said wireless terminal relative to said base station; a Doppler shift determination module coupled to said relative velocity determination module for outputting a Doppler shift correction signal, the Doppler shift correction signal based on the determined relative velocity of said wireless terminal relative to said base station; and a combining module for generating uplink signals for transmission from said wireless terminal, the uplink signals comprising the Doppler shift correction signal based on the determined relative velocity of said wireless terminal relative to said base station combined with a baseband signal or a carrier frequency.