有限负载下IEEE 802.11 DCF机制时延分析  

Delay analysis for IEEE 802.11 DCF mechanism in finite load

作　　者：张本宏[1,2] 陆阳[1,2] 吴其林[1] 翟琰[1,2] 

机构地区：[1]合肥工业大学计算机与信息学院,合肥230009 [2]安全关键工业测控技术教育部工程研究中心,合肥230009

出　　处：《电子测量与仪器学报》2011年第2期176-180,共5页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然基金(编号:60873195)资助项目

摘　　要：当前对于IEEE 802.11 DCF(distributed coordination function)机制的性能分析主要集中在吞吐量及接入时延,而对实时应用更为关心的端到端时延研究不足。利用概率母函数及M/G/1/∞排队理论,建立了有限负载下MAC(medium access control)层的接入时延和端到端时延分析模型,研究了分组到达率和站点数对接入时延和端到达时延的影响。仿真表明,该模型能够有效地对有限负载下DCF机制的时延性能进行预测。Existing performance analysis models for 802.11 DCF（distributed coordination function） mechanism mainly focus on throughput and access delay and make inadequate research on end-to-end delay that real-time systems are more concerned about. In this paper, by using probability generating function method and M/G/ 1/∞ theory, an analysis model is proposed for MAC（medium access control） layer access delay and end-to-end delay in finite load. Based on the model, the effect of packet arrival rate and number of stations on access delay and end-to-end delay is studied. Simulation shows that the proposed model can validly predict the delay performance of the DCF in finite load.

关 键 词：分布式协调功能 有限负载 接入时延 端到端时延 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]