Apparatus and method for selectively modifying collision delay intervals based on a detected capture effect in half-duplex network
US6078591A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1997 |
| Grant date | Jun 20, 2000 |
| Priority date | — |
| Expiry date | Jul 17, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/413
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Collision delay intervals are modified in a network node in order to overcome a detected capture effect in a half-duplex network. A network interface having a media access control (MAC) selectively modifies the collision delay interval based on detected capture effect. In one implementation, a node that has been locked out resets its attempt counter to become more aggressive in contending for the media. In applications requiring a guaranteed access, the attempt counter is reset and the collision delay interval is forced to zero slot times to attempt immediate access of the media following a collision. If the network includes multiple applications requiring guaranteed access, a node having encountered collisions switches from normal operation under the truncated binary exponential backoff (TBEB) algorithm to a shifted TBEB operation. If the node has captured the media, the node increases its attempt counter by a prescribed value to provide a less aggressive contention during collision mediation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.