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信道接入协议的应用极其广泛,这不仅表现在局域网中,而且在以太网、无线网等网络中也体现得很充分。当今的网络信道接入协议主要有以下几种:ALOHA、P-ALOHA、CSMA、CSMA/CD和CSMA/CA等。本课题是基于ALOHA、CSMA和CSMA/CD协议的研究,利用OPNET软件的节点和进程模型构建网络模型,同时结合仿真结果,绘制了CSMA和CSMA/CD协议吞吐量特性图,并与ALOHA的吞吐量特性图进行比较,证明了在任意业务总负载的情况下,CSMA和CSMA/CD协议都表现出比ALOHA协议更加优越的性能,从而进一步证实了在保证吞吐量性能的前提下,通过网络参数的配置,使网络的性能达到最优化的可行性。
The application of channel access protocol is extremely extensive, which not only shows in the LAN, but also fully shows in Ethernet, wireless network and other networks. Today’s network channel access protocols mainly include the following: ALOHA, P-ALOHA, CSMA, CSMA / CD and CSMA / CA. This topic is based on the research of ALOHA, CSMA and CSMA / CD protocols. The network model is built by using the node and process model of OPNET software. At the same time, the throughput characteristics of CSMA and CSMA / CD protocols are plotted and combined with the throughput of ALOHA It is proved that both the CSMA and CSMA / CD protocols show more superior performance than the ALOHA protocol under the condition of total load of any service, which further proves that under the premise of ensuring the throughput performance, through the network parameters The configuration, so that the performance of the network to optimize the feasibility.