链路状态感知的低轨卫星网络路由机制

低轨卫星的空间组网能够突破地形限制,实现全天候、高带宽、低时延、广覆盖的数据通信,弥补地面通信系统的不足,使通信服务全球化成为可能。但是,卫星节点的快速移动和能量受限使得空间链路面临高动态、不可靠、间歇性等问题。同时接入用户的分布不均容易导致卫星网络出现重载节点和局部拥塞的情况,这对空间组网和数据传输提出了新的挑战。传统的静态卫星组网模式可靠性差,可伸缩性低,难以适应空间动态组网的需求。针对低轨卫星网络拓扑变化快的特点,提出链路状态感知的路由机制,在降低卫星能耗的同时减轻网络的局部拥塞,使用树莓派搭建半实物仿真平台,并在该平台上进行实验,验证了该机制的有效性。

Link Quality Aware Routing Scheme in LEO Satellite Network

The low earth orbit (LEO) satellite network has emerged as a promising approach for global data communication thanks to its global seamless coverage, low latency and high bandwidth, which complements the existing terrestrial network.However, there are still many problems such as the high dynamic topology, intermittent inter-satellite link, unreliability, due to the high mobility and limited energy of the satellite.Meanwhile, the non-uniform distribution of the end users may lead to the unbalanced load and link congestion.These problems challenge the data transmission in LEO satellite network.The traditional static routing scheme is unreliable and inflexible to meet future needs for global broadband data access and mobile communication.In this paper, we proposed a link quality aware routing scheme to address the inherent dynamics of LEO satellite network, by jointly considering the link congestion and the energy consumption of satellites.We also conducted an experiment to validate our scheme by simulating multiple LEO satellites with several Raspberry pis.