空间信息网络多址接入技术研究进展

空间信息网络具有高动态拓扑，大时空尺度、多样化业务和星上资源受限等特点。随着星间组网技术的日益成熟和航天活动的不断增加，航天器用户的动态多址接入问题已经成为影响网络性能的关键因素，得到了国内外研究机构的广泛关注。首先分析了典型多址接入技术的主要特点；然后在空间信息网络场景中，对基于竞争的分布式接入控制、基于无冲突的集中式接入控制以及多协议混合接入控制等三种多址接入技术进行了性能分析，对比剖析了三种多址接入方法的优势与不足。最后，分别提出了典型多址接入技术在未来空间信息网络中的典型应用场景和适应性改造方法。

Research on multiple access technologies for space information network

Space information network is characterized by high dynamic topology, large spatial and temporal scale, diversified tasks and limited on-board computing resources. With the maturity of satellite networking and the increasing of space activities, the dynamic Multiple Access Control（MAC） has become a key technique that influences network performance. In this paper, the typical characteristics of MAC are addressed. The performances of three classical MAC protocols（contention based distributed access control, conflict-free centralized access control and hybrid multi-protocol access control） are investigated. And their strengths and weaknesses are analyzed as well and presents its typical application scenario and adaptive mechanism in the future.