Method and device for radio communication in traffic guidance systems
US5937358A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 23, 1997 |
| Grant date | Aug 10, 1999 |
| Priority date | — |
| Expiry date | May 23, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/2643
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A radio communication between central and peripheral units (LST, SUP, FZ, PAC, LSA) of a traffic guidance system which, in particular, is comprised of a master terminal (LST), vehicles (FZ) and passenger information systems (PAC) and optical signal units (LSA) to control the flow of traffic, which communicate with one another via at least two voice and two data channels (SK1, SK2, DK1, DK2) in such a way that messages are transmitted from the central unit (LST) to the peripheral units (FZ, PAC) via the first data channel (DK1) and correspondingly from the peripheral units (FZ, PAC) to the central unit (LST) via the second data channel (DK2). Further, the central and the peripheral units (LST, FZ, PAC) communicate via the first and the peripheral units (FZ) among one another at close range via the second voice channel (SK1 or SK2). The peripheral units (FZ) in normal operating condition are switched to the second voice channel (SK2) and, at the same time, participate in data communication on the data channels (DK1, DK2), so that in spite of intensive use of the short-range or voice channel (SK2) by the peripheral units (FZ), it allows smooth communication between the central and the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.