This paper gives an overview of topologies, medium access control protocols and current status for metropolitan area networks.

本文对城域网的拓扑结构、介质访问控制协议及国际上城域网研究动态进行了综述。

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For the directional antenna and wireless channel characteristics, there are many directional antenna based access control protocols have been proposed to achieve channel spatial reuse.

针对定向天线和无线信道的特点，有许多基于定向天线的接入控制协议被提出来，以实现信道的空分复用。

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