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Space-time analyses of CSMA/CD protocols

By: Kim, B.G.; Choi, D.-K.;

1989 / IEEE

Description

This item was taken from the IEEE Periodical ' Space-time analyses of CSMA/CD protocols ' The CSMA/CD (carrier-sense multiple-access/code division) protocols are analyzed in both time and space domains using space-time models. The models show that collisions are determined by the locations of nodes in a spatial domain as well as by the packet arrival times. A vulnerable area where a collision can potentially take place is determined by considering spatial dependency. Accurate estimation of the size of the vulnerable area and a corresponding collision probability allows one to derive the expected throughput rather than the worst-case throughput. The analytic results indicate that the expected performance is considerably higher than the previous worst-case performance. For example, compared to the previous result of 0.6 for alpha >