Wireless user position update using infrastructure measurements
US6166685A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1998 |
| Grant date | Dec 26, 2000 |
| Priority date | — |
| Expiry date | Nov 19, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/48
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for tracking the position of a mobile unit in a mobile radio communication system using information from earth-orbiting satellites and information received from the infrastructure of the system, wherein the infrastructure consists of equipment associated with transmitting and receiving voice or data traffic to and from the mobile phone. An initial position of the mobile unit is calculated using measurements from earth-orbiting satellites. Next, one or more range measurements are made using signals transmitted between the mobile unit and the infrastructure. A positional difference between the initial position and a current position of the mobile station is estimated using the one or more range measurements, wherein only range measurements made from signals transmitted between the mobile unit and the infrastructure are used to perform the estimating. An accuracy value is next determined for the estimated positional measurement, and the accuracy value is compared to a threshold to determine whether the estimated positional measurement has an acceptable accuracy. If the estimated positional measurement has an acceptable accuracy, then the initial position of the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.