Synchronized multiple access apparatus and method for a local area network
US4773066A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 15, 1986 |
| Grant date | Sep 20, 1988 |
| Priority date | — |
| Expiry date | Apr 15, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/407
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present access protocol for contention networks results in synchronous network operation. Each node determines the next transmission instant by counting from the beginning of the most recently received packet of information a time equal to that packet's labeled length minus the previously measured round trip propagation delay seen by the node. Subsequent instants will occur at intervals equal to the maximum propagation delay allowed on the network. Each time a subsequent packet is received, synchronization is rederived based on the packet. If no packets are received within predetermined slots, the network is considered to be in asynchronous mode, with transmissions allowed at any time following the next slot. The disclosed packet synchronized multiple access (PSMA) protocol improves the performance measures by which local area networks are evaluated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.