Method of information transmission with priority scheme in a time-division multiplex communication system comprising a loop line
US3985962A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1974 |
| Grant date | Oct 12, 1976 |
| Priority date | — |
| Expiry date | Aug 12, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q11/04
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A closed loop communication system in which the terminals are grouped into priority classes. Any terminal can seize a free channel if certain priority conditions exist. A channel (frame) is always preceded by a header comprising a priority request field and a priority grant field. The request field has n bits assigned to the n priority classes; a terminal requiring service sets that bit to "1" which corresponds to its class. Thus, the controller receives a compiled overall request and inserts, for the next cycle, into the grant field an indication as to which priority class or classes are now allowed access to the channel. This is accomplished by shifting the contents of the request field to the grant field. A terminal can only seize the channel if its priority class is allowed for that cycle by the grant field, and if the channel is still free.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.