Multisite radio system with false mobile radio signalling detection
US5875211A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Oct 26, 1995 |
| Grant date | Feb 23, 1999 |
| Priority date | — |
| Expiry date | Oct 26, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W84/08
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a digitally trunked radio repeating system that may include several radio site repeating transceivers, a site area identification coding system to ensure that transmissions intended for one site or as one mode are not decoded by another site or as another transmission mode. In particular, a site or transmission mode identification byte is used in the transmission error coding (CRC) scheme applied by both a mobile transceiver and the radio site repeater. Since the identification byte is used in the transmitter to calculate the CRC error correction data, the same identification byte must be used in the receiver to decode the CRC value. The intended radio site or transmission mode wilt apply the proper identification byte to decode a transmission. The wrong radio site or mode will not correctly decode the CRC value in a transmission because the wrong identification byte will be applied to the transmission. Accordingly, a transmission received by the wrong radio site or at a transceiver operating in a mode different that the transmission will not properly decode the transmission due to a CRC error caused by applying the wrong identification byte.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.