Enhancements of WLAN MAC Performance

Lei Zhang, P. Sénac, M. Diaz
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Abstract

The real potential of broadband wireless networks lies on the mobility, the success of Wi-Fi network with IEEE 802.11x technology makes it possible to access broadband with low cost. Numerous research work have focused on several issues inherited from the wireless technology such as security, reliability, transmission rate, etc. However, if we take a closer look at the core feature of 802.11, the contention based CSMA/CA access method, three intrinsic problems can be still identified: 1) Performance degradation due to the lack of flow control between the MAC and upper layer resulting in potential MAC buffer overflow; 2) Unfair bandwidth share issues; 3) 802.11 Performance Anomaly. In this paper, based on the 802.11 MAC layer analytical model, we give a brief description on our cross layer based solutions to the mentioned problems. The preliminary results from the simulation and experiments have demonstrated the feasibility of our proposals. Real deployment is planned in our future work.
WLAN MAC性能的增强
宽带无线网络的真正潜力在于移动性,采用IEEE 802.11x技术的Wi-Fi网络的成功使得以低成本接入宽带成为可能。大量的研究工作集中在无线技术遗留下来的几个问题上,如安全性、可靠性、传输速率等。然而,如果我们仔细研究802.11的核心特征,即基于争用的CSMA/CA访问方法,仍然可以识别出三个内在问题:1)由于MAC和上层之间缺乏流量控制而导致性能下降,导致潜在的MAC缓冲区溢出;2)带宽共享不公平问题;3) 802.11性能异常。本文基于802.11 MAC层分析模型,简要介绍了针对上述问题的跨层解决方案。初步的仿真和实验结果证明了我们的建议的可行性。实际部署计划在我们未来的工作中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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