System and method for accurate positioning of mobile terminals
First Claim
1. A telecommunications system for determining the location of a given one of a plurality of mobile terminals within a time division multiple access system, said telecommunications system comprising:
- a base transceiver station in wireless communication with said given mobile terminal, said base transceiver station being adapted to obtain at least first and second timing advance values associated with said given mobile terminal and receive a signal from said given mobile terminal; and
a base station controller connected to said base transceiver station and adapted to determine an average timing advance value, said average timing advance value being determined by averaging said at least first and second timing advance values received by said base transceiver station, said average timing advance value being used to estimate a time of arrival of said signal from said given mobile terminal to said base transceiver station, said time of arrival being used to determine the location of said given mobile terminal.
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Abstract
A telecommunications system and method is disclosed for improving the accuracy of the Time of Arrival (TOA) information extracted from the Timing Advance (TA) values reported by base stations. This can be accomplished by utilizing an average of m (m=2 or more) consecutive TA values, which will on average have a smaller mean-squared error than using a single TA value. By averaging multiple consecutive TA values to obtain a single measurement of TOA, the accuracy of the location algorithm employing the TOA information can be improved, and thus, the geographical location of a mobile terminal within a cellular network can be more accurately determined. The improvement in the accuracy of the location of the mobile terminal can be applied to both a stationary mobile terminal and a moving mobile terminal.
106 Citations
16 Claims
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1. A telecommunications system for determining the location of a given one of a plurality of mobile terminals within a time division multiple access system, said telecommunications system comprising:
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a base transceiver station in wireless communication with said given mobile terminal, said base transceiver station being adapted to obtain at least first and second timing advance values associated with said given mobile terminal and receive a signal from said given mobile terminal; and a base station controller connected to said base transceiver station and adapted to determine an average timing advance value, said average timing advance value being determined by averaging said at least first and second timing advance values received by said base transceiver station, said average timing advance value being used to estimate a time of arrival of said signal from said given mobile terminal to said base transceiver station, said time of arrival being used to determine the location of said given mobile terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining the location of a given one of a plurality of mobile terminals within a time division multiple access telecommunications system, said method comprising the steps of:
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obtaining, by a base transceiver station in wireless communication with said given mobile terminal, at least first and second timing advance values associated with said given mobile terminal; receiving a signal from said given mobile terminal at said base transceiver station; determining, by said base transceiver station, an average timing advance value by averaging said at least first and second timing advance values; estimating a time of arrival of said signal at said base transceiver station using said average timing advance value; and determining the location of said given mobile terminal using said time of arrival. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification