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| 摘要: |
| 基于IEEE 802。11 p-persistent协议模型的研究，对一种近似优化条件在多优先级业务网络条件下的适用性进行了证明。应用该近似优化条件，提出了一种适用于IEEE 802。11 QoS区分服务支持的自适应优化算法QATC (QoS-supporting adaptive transmission control)。算法利用信道侦听信息实时优化调整各优先级业务的发送概率，更新相应的协议参数，实现信道利用率的提高和系统性能的增强。QATC算法不需要估计各优先级业务的节点数量，并且拥有 |
| 关键词: IEEE 802.11 QoS区分 p 坚持 自适应优化算法 多速率网络 |
| DOI： |
| 分类号: |
| 基金项目:Supported by the National Natural Science Foundation of China under Grant No.60802024 (国家自然科学基金); the National High-Tech Research and Development Plan of China under Grant Nos.2005AA123820, 2005AA121122 (国家高技术研究发展计划(863)) |
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| Performance Optimization for IEEE 802.11 with QoS Differentiation Supporting |
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MAO Jian-Bing, MAO Yu-Ming, LENG Su-Peng, BAI Xiang
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| Abstract: |
| In this paper, the extended application of an approximating optimization formula, which is first proposed to simplify the optimization of networks with a single traffic class in the literature, in QoS-supporting networks is analytically justified and numerically investigated. Based on the formula, an adaptive optimization scheme, named QATC (QoS-supporting adaptive transmission control), is proposed for IEEE 802.11 to optimize the system performance, while providing service differentiation among traffic classes. The proposed scheme works around the difficult station number estimation. It utilizes information acquired from channel sensing to adjust the packet transmitting, adaptively towards achieving an invariable system object for different network conditions. Furthermore, the scheme to optimize the multi-rate networks is also exploited. Simulation results show that QATC has an effective ability to optimize the operation of networks adaptively in various conditions, and it can greatly improve the system throughput compared with the standard IEEE 802.11 MAC and related enhancements. Moreover, the system throughput, achieved by the scheme, is very close to the theoretical optimal value. |
| Key words: IEEE 802.11 QoS differentiation p-persistent adaptive optimization scheme multi-rate network |
