Patent ID: 7689240
Filing Date: 2010-03-30
Classification: H04B,H04W

Abstract:
1. A method for controlling an RF signal characteristic for a signal transmitted from a mobile station to support an augmenting service associated with a wireless communications system, the method comprising: collecting data relating to values of said signal characteristic, wherein the collected data includes a plurality of the following measurement types: a measurement of the power level for a downlink signal from a base transceiver station received at the mobile station; a measurement of the time of arrival for a downlink signal from a base transceiver station received at the mobile station; a measurement of the time difference of arrival for a downlink signal from a base transceiver station received at the mobile station; a measurement of the round trip delay for the propagation of an RF signal over the two-way path that includes a downlink and an uplink direction between a base transceiver station and the mobile station; a measurement of the timing advance for the propagation of an RF signal over the two-way paths that include downlink and uplink directions between a base transceiver station and the mobile station; a wireless communications system parameter specifying a power level commanded for a downlink signal as transmitted from a base transceiver station; a wireless communications system parameter specifying a power level commanded for an uplink signal as transmitted from the mobile station; a representation of the RF signal propagation loss between a base transceiver station and an estimated location for the mobile station; a representation of the RF signal transmission and reception system gains for a signal path between a base transceiver station and an estimated location for the mobile station; a measurement of communications system interference at a base transceiver station; a measurement of communications system quality of service at a base transceiver station; a measurement of communications system bit error rate at a base transceiver station; data indicative of a number of location measurement units that are able to receive a transmission from the mobile station; evaluating the collected data to derive a characteristic-dependent expected measure of effectiveness for an expected performance of said augmenting service, wherein said augmenting service comprises a wireless location determination service and said expected measure of effectiveness includes an expected location determination accuracy; determining an optimal value for said characteristic to support said augmenting service, wherein the determination of an optimal value comprises jointly assessing both an expected location measurement accuracy and communications system quality of service or bit error rate expected from the impacts of interference associated with candidate adjusted signal characteristics; communicating said optimal value to said mobile station; and using said optimal value to control the mobile station's transmitted signal.