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计算机工程 ›› 2009, Vol. 35 ›› Issue (12): 97-99. doi: 10.3969/j.issn.1000-3428.2009.12.034

• 网络与通信 • 上一篇    下一篇

基于数据包优先级的DCF及其性能分析

王 岩,王开宇,金顺福   

  1. (燕山大学信息科学与工程学院,秦皇岛 066004)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-06-20 发布日期:2009-06-20

DCF Based on Packet Priority and Its Performance Analysis

WANG Yan, WANG Kai-yu, JIN Shun-fu   

  1. (College of Information Science and Engineering, Yanshan University, Qinhuangdao 066004)
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-06-20 Published:2009-06-20

摘要: 针对实时业务中的不同QoS需要,考虑数据包优先级,在经典分布式协调机制(DCF)和各种改进DCF的基础上,提出一种基于数据包优先级的DCF(PMDCF)。采用马尔科夫链方法,对基于PMDCF建立的数学模型进行性能分析,得到系统饱和吞吐量S的解析式。数值例子和仿真实验结果证明,与已有DCF相比,PMDCF有效提高了系统性能。

关键词: DCF机制, 数据包优先级, 饱和吞吐量, 马尔科夫链

Abstract: Aiming at the different QoS requirement of real-time affairs, considering the priority of packet, and based on the classical Distributed Coordination Function(DCF) and several modified DCFs, this paper presents a Packet priority-based Modified Distributed Coordination Function(PMDCF). It uses the method of Markov chain to analyze the performance of PMDCF and gets the formula of saturation throughput for the system. Numeral example and simulation results show that compared with existing DCFs, PMDCF can effectively improve the system performance.

Key words: Distributed Coordination Function(DCF), packet priority, saturation throughput, Markov chain

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