Transmit-power control for wireless mobile services
First Claim
Patent Images
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.
2 Assignments
0 Petitions
Accused Products
Abstract
A method and system for enhancing the performance of augmented services associated with a wireless communications system through the dynamic exploitation of current measurements and operational configuration parameters to accurately and effectively control the signal power and duration transmitted by the mobile unit of interest.
-
Citations
111 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
-
-
31. A control system, comprising:
-
(a) a processor programmed to receive collected data relating to a signal characteristic associated with a signal transmitted by a mobile station and to derive a characteristic-dependent expected measure of effectiveness for an expected performance of an augmenting service, and to determine an optimal value for said characteristic to support said augmenting service, wherein said augmenting service comprises a wireless location determination service, said expected measure of effectiveness includes an expected location determination accuracy, and 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; and
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 unlink 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; and(b) a mechanism to communicate said optimal value to said mobile station. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
-
-
60. A wireless communications system including base transceiver stations for communicating with mobile stations;
- a wireless location system; and
a transmission power control system for collecting data relating to a transmission power level associated with a signal transmitted by a mobile station (MS) of interest and processing the collected data to derive an expected measure of effectiveness for an expected performance of the location system, wherein said expected measure of effectiveness includes a representation of an expected location determination accuracy, and wherein said transmission power control system comprises a processor configured to determine an optimal value for the transmission power of said MS of interest to support said location system, and a mechanism to communicate said optimal value to said MS of interest;
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. - View Dependent Claims (61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87)
- a wireless location system; and
-
88. A process for the determining an optimized set of mobile station (MS) signal-transmission settings to enhance the performance of a serving mobile location center (SMLC) that augments a wireless communication system (WCS), wherein said SMLC comprises a plurality of location measurement units (LMUs), comprising:
-
collecting available information from a plurality of sources, said plurality of sources including a mobile station (MS) to be located, the serving mobile location center (SMLC) and at least one of a base transceiver station (BTS) and base station controller (BSC), wherein the available information collected includes data characterizing current signal and noise characteristics present in a domain of the WCS; making a preliminary calculation of a nominal MS location based on the collected information; using the nominal MS location to derive initial estimates of distance-dependent signal propagation losses for the propagation of a signal from the nominal MS location to the locations of candidate cooperating BTS and/or LMU reception sites; evaluating anticipated performance by applying the estimated signal propagation losses to assess signal and noise conditions that would prevail at each candidate cooperating BTS and/or LMU site; assessing candidate MS signal power and duration characteristics for their potential contribution to location-determination accuracy, including, for each candidate cooperating site, comparing currently postulated MS transmission settings with those judged to be probabilistically required, and determining the probability that each candidate cooperating site could provide an acceptable measurement under the assessed signal and interference conditions local to the cooperating site; calculating an anticipated location uncertainty; deciding whether the anticipated location uncertainty is acceptable; upon deciding that the anticipated location uncertainty is acceptable, evaluating the interference impacts of potentially raised power or energy level for the MS; and determining optimal settings for the desired signal transmissions from the MS, and communicating these optimal setting in a command message so as to cause the MS to implement its signal transmissions with the power level(s) dictated in the command message. - View Dependent Claims (89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99)
-
-
100. A system, comprising:
-
a serving mobile location center (SMLC) including a plurality of location measurement units (LMUs), wherein said SMLC is configured to augment a wireless communication system (WCS) operatively coupled to said SMLC, said WCS including a plurality of base transceiver stations (BTSs); and an evaluation processor operatively coupled to said SMLC and configured to determine an optimized set of mobile station (MS) signal-transmission settings to enhance the performance of said SMLC, said evaluation processor being configured for; collecting available information from a plurality of sources, said plurality of sources including a mobile station (MS) to be located, the SMLC and at least one of a BTS and BSC, wherein the available information collected includes data characterizing current signal and noise characteristics present in a domain of the WCS; making a preliminary calculation of a nominal MS location based on the collected information; using the nominal MS location to derive initial estimates of distance-dependent signal propagation losses for the propagation of a signal from the nominal MS location to the locations of candidate cooperating BTS and/or LMU reception sites; evaluating anticipated performance by applying the estimated signal propagation losses to assess signal and noise conditions that would prevail at each candidate cooperating BTS and/or LMU site; assessing candidate MS signal power and duration characteristics for their potential contribution to location-determination accuracy, including, for each candidate cooperating site, comparing currently postulated MS transmission settings with those judged to be probabilistically required, and determining the probability that each candidate cooperating site could provide an acceptable measurement under the assessed signal and interference conditions local to the cooperating site; calculating an anticipated location uncertainty; deciding whether the anticipated location uncertainty is acceptable; evaluating the interference impacts of potentially raised power or energy level for the MS; and determining optimal settings for the desired signal transmissions from the MS, and communicating these optimal setting. - View Dependent Claims (101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111)
-
Specification