A FULLY-HYBRID MAC PROTOCOL IN LANS

In announced hybrid protocols,there are two mechanisms usually employed.One operates in aCSMA family manner and the other follows a token passing family way.However,only one ofthem works efficiently when traffic is light or heavy.This results in an inefficient redundance and aburden to the protocol implementation.In this paper,we present a new hybrid concept and its idealmodel in which risky transmissions alternate with safe transmissions in response to the dynamicchange in traffic.Being similar to virtual time CSMA in the abstract,a single control mechanism isproposed to approach this ideal model.The mechanism is rather compact,and its implementationcan be designed to be simple,efficient,reliable,robust,and fully distributed without any centralizedelement at any instant.Simulation results show that the proposed mechanism performs well overthe entire range of the traffic load from light to heavy.

A FULLY-HYBRID MAC PROTOCOL IN LANS

In announced hybrid protocols,there are two mechanisms usually employed.One operates in a CSMA family manner and the other follows a token passing family way.However,only one of them works efficiently when traffic is light or heavy.This results in an inefficient redundance and a burden to the protocol implementation.In this paper,we present a new hybrid concept and its ideal model in which risky transmissions alternate with safe transmissions in response to the dynamic change in traffic.Being similar to virtual time CSMA in the abstract,a single control mechanism is proposed to approach this ideal model.The mechanism is rather compact,and its implementation can be designed to be simple,efficient,reliable,robust,and fully distributed without any centralized element at any instant.Simulation results show that the proposed mechanism performs well over the entire range of the traffic load from light to heavy.