利用多波束智能天线提高Wiamx MESH网络集中调度性能的方法

Method to Improve the Performance of Centralized Scheduling for Wimax Mesh Networks by Using Multi-beam Smart Antennas

在Wimax(IEEE802.16)Mesh网络集中调度机制中,通常采用树形拓扑,由于数据都是往来于Mesh基站(MBS,Mesh Base Station)的,越靠近MBS的节点,需要中继的数据越多,因此越可能成为影响网络吞吐量的瓶颈节点。当采用全向天线时,使用各种先进的调度算法都不能有效解决这个瓶颈问题。提出了在网络节点上(尤其是在瓶颈节点上)使用多波束智能天线,使更多链路可以并行传输,从而有效解决瓶颈问题。仿真结果表明,提出的方法可以显著提高网络吞吐量,而且,仅在瓶颈节点上使用多波束智能天线,可以在性能与代价之间进行折中。

In IEEE 802.16 based wireless mesh networks, a tree-based topology is usually assumed in centralized scheduling scheme, and the traffic is to or from mesh base station （MBS）. The nearer a node locates to MBS, the more traffic it should relay, and the more probably it becomes a bottleneck node which influencing the network throughput. Various advanced scheduling algorithms can not solve the bottleneck problem efficiently when omni-directional antennas are used. Multiple-beam smart antennas are proposed to use in the network nodes, especially in bottleneck node, so that more links can transmit concurrently, and the bottleneck problem can be solved efficiently. The simulation results show that the proposed method can improve the network throughput greatly, and tradeoff between performance and cost can be achieved only using multiple-beam smart antennas in bottleneck node.