Communication system having dedicated time slots for selection signals
US6519245B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 11, 1999 |
| Grant date | Feb 11, 2003 |
| Priority date | — |
| Expiry date | Jan 11, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/43
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A communication system having hubs and mobile units where a mobile unit uses selection signals from hubs during dedicated time slots for selecting a particular hub for communication during operational time slots. The hubs communicate on respective channels. The mobile units communicate with a particular hub on the channel associated with that hub. Each hub transmits a selection signal during a time slot that is dedicated for the selection signal from that hub. The mobile units base their selection of hub upon a comparison of the error rates of the respective selection signals and then communicate with the selected hub during with operational signals during the operational time slots. Certain message data is included in the selection signal from all the hubs in order to increase the reliability that the message data will be received by the mobile units. The certain message data includes precise positioning global positioning system (PPGPS) information for enabling mobile units equipped with GPS receivers to determine their respective geographical locations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.