System for adaptive backoff mechanisms in CSMA/CD networks

Details System for adaptive backoff mechanisms in CSMA/CD networks System for adaptive backoff mechanisms in CSMA/CD networks

1997-11-21

1998-11-24

Vu, Huy D.

Multiplex communications

Channel assignment techniques

Carrier sense multiple access

370470, 3408255, H04J 314

Patent

active

058417788

ABSTRACT:
A system for controlling traffic on a contention-based local area network (LAN) such as one according to the CSMA/CD or Ethernet specification. To selectively preempt low priority messages on the LAN so that high priority messages may be transmitted, the system uses a station profile table (260) that holds information relating to an average frame length for messages transmitted from each station on the LAN. When a station connected to the LAN through a network interface (250) needs to transmit a high priority message such as a voice communication, a traffic monitor (240) checks for a low priority message on the LAN. If a low priority message is detected, a station identifier, priority level, and length of frame already transmitted are determined, and an average frame length is read from the station profile table (260). If the length of frame already transmitted is less than a predetermined threshold, then a computing element (220) transmits the high priority message through the network interface (250) to the LAN, to force a collision. After waiting for a period shorter than the standard backoff period defined by the CSMA/CD specification, the high priority message is retransmitted.

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