Cellular radio synchronization
US6667963B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1999 |
| Grant date | Dec 23, 2003 |
| Priority date | — |
| Expiry date | Jan 14, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W56/0075
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A cellular radio network based positioning system for determining the position of a mobile station (16). For each base transceiver station (1 to 5) or cell of the network, a fixed list of base transceiver stations is stored by a Mobile Positioning Centre (13). Each list identifies those base transceiver stations which enable the position of a mobile station served by the corresponding base transceiver station (6) to be optimally determined. The list is transmitted to the mobile station (16) via the serving base transceiver station (6) together with a list of respective real time differences which exist between the serving base transceiver stations and the listed base transceiver stations. The mobile station determines an observed time difference for each of the listed base transceiver stations, relative to the serving base transceiver station (6), from signals broadcast by the listed base transceiver stations. The mobile station listens for synchronization sequences contained in these signals during time windows defined by the various real time differences. The observed time differences are transmitted from the mobile station (6) to the serving base transceiver station (6) and are …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.