Method for maintaining secure information synchronization on a control channel
US5502767A · kind A · utility
Inventors
Key dates
| Filing date | May 27, 1994 |
| Grant date | Mar 26, 1996 |
| Priority date | — |
| Expiry date | May 27, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/80
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Synchronization of secure information on a control channel (104) of a secure radio trunking communication system (100), is maintained by periodically transmitting control encryption parameters (CEP) (111) by the controller (101) on the control channel (104). A secure communication unit (102 and 103) may receive and store the CEP (111) in memory (108 and 109), and subsequently, use the stored CEP (111) to communicate securely with the controller (101) on the control channel (104). When the secure communication unit is assigned to a working channel (105-107), the controller periodically sends the CEP (117) to the secure communication unit (102 and 103) on the working channel (105-107). When the secure communication unit (102 and 103) returns to the control channel (104), the secure communication unit may use the CEP (117) stored in the memory (108 and 109) to communicate securely on the control channel (104).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.