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DIDD(double increase double decrease)协议是一种无线局域网介质访问控制802.11DCF(distributed coordination function)协议的改进。为分析DIDD协议在非饱和情况下的性能,该文使用三维Markov链模型,分析DIDD协议的回退过程求解节点的稳态发包概率;使用一维Markov链模型,求解起始回退阶段数的稳态分布;使用排队理论,计算了网络的非饱和吞吐量和数据包延迟。结果表明:在各种数据速率下,理论分析结果与仿真结果一致。
The DIDD (double increase double decrease) protocol is an improvement over the Wireless Local Area Network Medium Access Control (802.11DCF) protocol. In order to analyze the performance of DIDD protocol under non-saturated conditions, this paper uses the three-dimensional Markov chain model to analyze the steady-state packet sending probability of nodes in DIDD protocol. Using the one-dimensional Markov chain model, the number of initial backoff phases Steady-state distribution; Using queuing theory, the network’s non-saturated throughput and packet delay are calculated. The results show that at various data rates, the theoretical analysis is consistent with the simulation results.