Patent ID: 8432312
Filing Date: 2013-04-30
Classification: G01S

Abstract:
1. A method of acquiring a signal at a telecommunications system receiver with the aid of acquisition assistance data, the method comprising: a) obtaining acquisition assistance data at the receiver, the acquisition assistance data being provided by an entity remote from the receiver; b) determining, subsequently to a time of obtaining the acquisition assistance data, to acquire a particular signal; c) obtaining an estimate of a receiver clock bias from the previously obtained acquisition assistance data; d) evaluating a validity of the previously obtained acquisition assistance data for use in acquiring the particular signal, wherein evaluating the validity is based at least in part on a lapsed time since the estimate of the receiver clock bias was obtained and an amount of a mobile station clock frequency error associated with the receiver clock bias; and e) calculating an expected time of arrival parameter of the particular signal based in part on the estimate of the receiver clock bias determined from the previously obtained acquisition assistance data.