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一种优化WLAN上下行公平性的MAC机制

A MAC Scheme for Optimizing Fairness on Uplink and Downlink in WLAN
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摘要 IEEE 802.11 DCF主要基于载波检测/碰撞退避多址接入协议和时隙制退避算法。因此,往往在基础架构模式中,AP与用户站在随机竞争信道过程中并无优势,并且DCF应用于多速率WLAN,各站点之间的竞争并不均匀(时间不均),存在吞吐量异常和严重不公平性问题。通过建立三维Markov链模型,对非饱和状态下802.11 MAC协议上下行带宽公平性进行了分析,由此提出基于下行链路优先的DPMAC协议,其核心思想是:AP享有优先访问信道的权利,并且可以根据下行链路状态动态调整占有信道的时间,各用户站竞争信道仍然采用原有的DCF访问方式。通过仿真证实DPMAC协议能很好地实现上下行链路公平性,达到满意的效果。 The medium access control mechanism of IEEE 802.11 DCF is based on carrier sense multiple access with collision avoidance and binary slotted exponential backoff. It shows that the AP has no advantage when accessing the shared channel in infrastructure mode using DCF. A tri- dimensional Markov chain is presented in this paper to analyze the fairness of uplink and downlink in WLAN. Then, a MAC scheme is proposed based on downlink priority, named DPMAC. Simulation indicates that this scheme can improve the channel throughput with downlink/uplink bandwidth controlled.
作者 聂明星 蒋新华 邹复民 王桐森
机构地区 福建工程学院计算机与信息科学系
出处 《计算机技术与发展》 2008年第8期54-57,共4页 Computer Technology and Development
基金 福建省重大产业技术开发专项(闽发改投资2005531号) 福建工程学院校科研发展基金立项项目(GY-Z0765)
关键词 IEEE 802 11 DCF 三维Markov链 DPMAC IEEE 802.11 DCF tri - dimensional Markov chain DPMAC
分类号 TP311.5 [自动化与计算机技术—计算机软件与理论]
  • 相关文献

参考文献11

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二级参考文献19

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计算机技术与发展
2008年 第8期

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