摘要
在无线局域网(WLAN)中实现优先级服务需要媒体接入控制(MAC)层的支持。IEEE802.11标准的MAC层基于分布式协调功能(DCF),不支持优先级服务。通过改变MAC协议参数,可对服务进行区分,但目前的研究尚未揭示MAC层协议参数与各优先级服务质量的数量关系,故而无法得到可商用的支持优先级服务的解决方案。本文提出一种分析模型,对无线站点的回退过程进行建模,从理论上解决了IEEE802.11 MAC层协议参数与服务质量的定量关系问题。基于OPNET的仿真实验验证了分析模型的正确性。
Support from medium access control(MAC)layer is necessary for providing QoS in wireless local area networks (WLAN). In IEEE 802.11 the MAC protocol is based on distributed coordination function(DCF), which doesn't suport QoS. Services can be differentiated via varying the MAC protocol parameters. However, the quantitative relationship between QoS and protocol parameters is not uncovered. Then it is difficult for commercial use. This paper proposes an analytical model modeling the backoff process of the wireless station. Through the analytical model, the above problem is settled. The validation of the model is provided by OPNET simulations.
出处
《计算机科学》
CSCD
北大核心
2004年第10期46-49,共4页
Computer Science
基金
国家自然科学基金资助(No.60202005)
