Femtocell handset assisted clock correction

摘要

A method of improving frequency accuracy of a clock unit adapted to clock a femtocell local cellular communication home base station is provided. The method comprising: providing a local cellular communication home base station having an oscillator adapted to operate as a clock therein, wherein at least one cellular communication device is camped thereto, and wherein the at least one camped cellular communication device is further in communication with at least one neighboring cellular communication base station which is associated with an oscillator adapted to operate as a clock therein; periodically applying a derivative operator over periodically obtained local communication parameters and periodically obtained neighboring communication parameters thereby generating derivative communication parameters over time; and correcting the accuracy of the frequency of the clock in the femtocell local cellular communication home base station using the derivative communication parameters over time.

主权项

1. A first wireless communication base station system comprising one or more processors configured to:
conduct a frequency scan by altering a clock frequency of its clock source across a frequency range; while conducting the frequency scan, receive from a wireless communication device that follows the altered clock frequency across the frequency range, signal strength measurements of a signal between the wireless communication device and a second wireless communication base station associated with a frequency of the second wireless communication base station and a frequency being scanned,
wherein the first wireless communication base station is outside a coverage area of the second wireless communication base station, wherein the wireless communication device is camped on the first wireless communication base station and in communication with the second wireless communication base station, and wherein the clock source of the first wireless communication base station has a substantially lower accuracy level than a clock source of the second wireless communication base station; determine a desirable clock frequency for the clock source of the first wireless communication base station, wherein the desirable clock frequency is a frequency within the frequency scan at which the received signal strength measurements are at a maximum, and wherein the one or more processors are further configured to:
generate a Gaussian representation of the signal strength measurements as a function of the first wireless communication base station frequency; andselect as the desirable clock frequency, a clock frequency in which the signal strength measurements are at a Gaussian center; and receive connection frame number and system frame number parameters associated with the second wireless communication base station at a rate that enables a determination of a clock drift rate.