Trunked radio communication system having encrypted system control information
US5054068A · kind A · utility
17Cited by
1References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 7, 1990 |
| Grant date | Oct 1, 1991 |
| Priority date | — |
| Expiry date | May 7, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/34
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A trunked communication system having a control resource that encrypts system control messages. In one embodiment, the encryption includes controlling a bit interleaving process (208, 311) as a function of an encryption key (203, 321). In another embodiment, the encryption process includes reordering (202, 302) the information bits that constitute the message itself. If both encryption processes are used, the controlling encryption key can either be the same for both processes, or different.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.