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作为无线局域网MAC层和PHY层最重要的标准,IEEE802.11已得到大多数电信设备制造商的支持,并广泛应用于移动计算与通信.基于IEEE802.11支持区分业务的多优先级接入控制机制是近年来受到广泛重视的研究领域.首先介绍了IEEE802.11协议组及其MAC实现,特别关注了DCF原理和退避机制.第二,我们对现有的几类基于竞争的优先级接入控制机制进行了介绍和评述.最后,我们给出了结论,并对未来可能的研究方向进行了讨论.
As the most important standard for MAC layer and PHY layer of WLAN, IEEE802.11 has been supported by most telecom equipment manufacturers and widely used in mobile computing and communication.It is based on IEEE802.11 to support multi-priority access control Mechanism is widely studied in recent years.Firstly, IEEE802.11 protocol suite and its MAC implementation are introduced, with particular attention to the DCF principle and backoff mechanism.Secondly, we analyze several existing contention-based priority access Control mechanism introduced and reviewed.Finally, we give the conclusion and discuss the possible future research direction.