Method and system for real-time navigation using mobile telephones
US6654683B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Jun 18, 2001 |
| Grant date | Nov 25, 2003 |
| Priority date | — |
| Expiry date | Jul 29, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/096894
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In an Interactive Real-Time Distributed Navigation system a method and system is disclosed for implementing a warm start/cold start option. Through selection of the warm start option, an interactive session for providing navigational directions to a user is more quickly established because a user's position is assumed not to be ambiguous. A method of the invention verifies this assumption. Through selection of the cold start option, the method of the invention seeks to remove ambiguity in a user's position before providing navigational directions. If, however, a user's position is not ambiguous, the method of the invention reverts to a warm start condition to immediately transmit navigational directions to the user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.