Radio trunking system with transceivers and repeaters using special channel acquisition protocol
US4658435A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1985 |
| Grant date | Apr 14, 1987 |
| Priority date | — |
| Expiry date | Apr 10, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W76/45
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An arrangement for establishing communication between a first mobile radio transceiver and a second mobile radio transceiver through a repeater over a radio frequency channel selected from a plurality of such channels. A repeater distinguishes between two-tone signalling sequences and four-tone signalling sequences by determining the arrival rate over some predefined interval of a received signalling sequence. The repeater transmits a busy signal to alert mobile stations seeking to acquire a channel that the repeater is busy. The repeater interrupts the transmitted busy signal during a portion of the four-tone signalling sequence but not the two-tone signalling sequence to help prevent two-tone mobile stations from falsing on four-tone signalling sequences. The arrangement is thus made compatible with both two-tone signalling and four-tone signalling formats. A calling mobile transceiver may specify the length of signalling transmitted by the repeater, so that the mobile transceiver can cause the repeater to transmit signalling for a duration longer than the mobile transceiver itself would require.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.