Multiplex communications – Channel assignment techniques – Carrier sense multiple access
Patent
1996-10-24
1997-07-22
Olms, Douglas W.
Multiplex communications
Channel assignment techniques
Carrier sense multiple access
H04L 12411
Patent
active
056509979
ABSTRACT:
A technique for modifying the IEEE 802.3 standard for selecting backoff times in a Carrier Sense Multiple Access with Collision Detection (CSMA/CD) network, in the event that a collision is sensed by a node that has captured the network communication channel. If there is a small number of active nodes on the network, one node may capture the channel and the standard backoff algorithm makes it increasingly unlikely for another node to transmit. The new technique provides for less aggressive, i.e. longer, backoff times before at least the first retransmission attempt made by a node that has captured the channel. Three specific examples of the technique are disclosed. Even though the invention represents a departure from the standard CSMA/CD backoff algorithm, the overall average backoff times provided by the invention can be selected to be consistent with the average times provided by the standard. Moreover, nodes using the invention interoperate successfully with nodes that do not.
REFERENCES:
patent: 4598285 (1986-07-01), Hoshen
patent: 4766591 (1988-08-01), Huang
patent: 4979168 (1990-12-01), Courtois et al.
patent: 5164942 (1992-11-01), Kamerman et al.
Hawe William R.
Lauck Anthony G.
Ramakrishnan Kadangode K.
Yang Henry Sho-Che
Digital Equipment Corporation
Kozik Kenneth F.
Olms Douglas W.
Patel Ajit
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