Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2005-03-29
2005-03-29
Milord, Marceau (Department: 2682)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S456100, C455S456200, C455S456500, C455S456600, C455S423000, C455S067110, C455S067140, C455S436000, C455S437000, C455S439000, C342S457000, C342S464000, C342S450000
Reexamination Certificate
active
06873852
ABSTRACT:
A system and method of estimating the position of a mobile terminal (MT) operating in a radio telecommunications network. Expected Received Signal Strength (RSS) values are predicted by a computer-aided prediction tool, and/or are measured by a test MT from base station transceivers. The predicted and measured RSS values are then tagged to indicate whether each value was predicted or measured. The RSS values are then stored at a plurality of locations in a database. When RSS measurements are received from the MT being located, a covariance matrix is used to compute metrics for the locations in the database. If more than a threshold percentage of the locations were populated with measured values, a Maximum-Likelihood (ML) estimator is used to estimate the position of the MT. If fewer than the threshold percentage of locations were populated with measured values, a Minimum-Mean-Square-Error (MMSE) estimator is used to estimate the position.
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Koorapaty Havish
Panakanti Viswanath
Wang Wade
Zhu Guwei
Milord Marceau
Telefonaktiebolaget LM Ericsson (publ)
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