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中文摘要：
在IEEE 802.11分布式协调功能（DCF）协议的单跳无线局域网环境中,数据包冲突会在网络节点间产生非同步退避现象.以固定长度的物理层时隙为状态转换的单位时间,考虑节点冻结期经历的状态,提出一个新的三维马尔可夫链模型以分析非同步退避现象对协议吞吐量的影响.由该分析模型得出的结果在IEEE 802.11 DCF协议的两种数据包传输机制下都表现出与仿真结果较好的一致性,并且随着网络节点数增加,与已有参考模型相比也具有较高的准确性.
英文摘要：
In single-hop wireless local area networks based on the IEEE 802.11 distributed coordination function（DCF） protocol,packet collisions can cause asynchronous backoff among nodes.To analyze the effect of this phenomenon on the throughput of IEEE 802.11 DCF,this paper proposes a new analytic model of three-dimensional Markov chain,in which the unit-time of state transitions have a fixed length equal to the physical-layer slot.The sate transitions of freezing duration are considered.Simulations show that the analytic model is accurate for the two mechanisms of packet transmission employed by IEEE 802.11 DCF,and can lead to better correctness than the referenced model as the number of nodes increases.
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