Method and system for locating a mobile terminal in a cellular radio network
US6665540B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 2001 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | Jul 11, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S1/026
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and system for estimating the location of a mobile station in a telecommunications network having a reference base station and a plurality of neighboring base stations. At the beginning of the E-OTD measurement, the mobile station may be provided with the expected OTD values in the reference base station site, possibly instead of RTD values of the neighboring base stations, to make it possible for the mobile station to calculate the uncertainty in the measured OTD due to its unknown location. Alternatively, the network provides the mobile station the expected OTD values in its current location, and the estimated uncertainty of those values. When the uncertainty is greater than a predetermined value, the mobile station makes E-OTD measurements based on the SCH burst. Otherwise, the mobile station makes measurements based on normal/dummy bursts, and/or aligns the time window for taking samples from signals received from neighboring base stations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.