机会网络拥塞控制的研究

Study on congestion control for opportunistic network

机会网络发生拥塞使结点的存储空间处于持续耗尽状态,将严重影响机会网络的性能。机会网络采用的是存储-携带-转发路由模式,通过利用节点移动所形成的相遇机会,逐跳转发消息来实现节点之间的通信,这种与传统网络不相同的组网方式给拥塞控制机制带来了新的挑战。首先介绍了机会网络路由与转发机制,并分析了现有路由协议有可能导致拥塞产生的原因,然后阐述了机会网络拥塞控制与延迟容忍网络之间的联系,简要叙述了自适应拥塞控制方法更适合机会网络,并对机会网络自适应拥塞控制研究进展进行了讨论,最后进行总结并展望了机会网络拥塞控制技术未来的研究方向。

Congestion in opportunistic networks may take the state of persistentstorage exhaustion and affects the network performance seriously. Opportunistic networks adopt ＂store-carry-forward＂ routing pattern to implement communications among nodes and take advantage of the nodes＇ encounter opportunities to transfer messages in a hop-by-hop way. This networking approach, totally different from the traditional communication model, poses significant challenge for congestion control mechanism. The routing and forwarding mechanisms of opportunistic networks was firstly introduced and the reason that the existing routing protocols may result in congestion was analyzed. Thenthe relation between congestion control of opportunistic network and delay tolerant network （DTN） was expounds, and it was briefly described why the adaptive congestion control is more suitable for opportunistic networks. Also, dthe research progress of adaptive congestion control of opportunistic network was introduced. Finally, the possible research focuses for congestion control technique of opportunistic networks in the future were summarized and previewed.