摘要
物联网是第五代移动通信中重要的应用场景,但目前的地面物联网有一定的限制,在沙漠、海洋、林区等一系列人烟稀少或人类难以到达的区域难以放置物联网节点或基站。为解决这一问题,卫星物联网的概念应运而生。如何解决大量低成本终端,同时解决接入网络时的用户间碰撞和干扰问题是目前的一大挑战。因此,为卫星物联网业务设计适用的接入协议十分必要。将卫星物联网场景分为有汇聚节点的场景和无汇聚节点的场景,并针对不同场景介绍了典型随机接入协议,进行了性能仿真和比较分析,得出CRDSA协议和IRSA协议更适用于有汇聚节点的场景,纯ALOHA协议和SA协议更适用于无汇聚节点的场景的结论。
Internet of Things (IoT) is an important application scenario in the fifth generation of mobile communications,yet the current ground-based Internet of Things has certain restrictions.It is difficult to place IoT nodes or base stations in a series of areas such as deserts,oceans,and forest areas where people are sparsely populated or difficult for humans to reach.In order to solve this problem,the concept of satellite Internet of Things came into being.However,how to solve the problem of collision and interference between users when a large number of low-cost terminals access the network at the same time is a major challenge.Therefore,it is necessary to design an applicable access protocol for the satellite IoT service.Aiming at the current satellite IoT scenarios,several common random access protocols which are more suitable in this scenario are introduced,and their performance simulation and comparison analysis are carried out.It is concluded that the CRDSA protocol and the IRSA protocol are more suitable for the scenarios with aggregation nodes,and the pure ALOHA protocol and the SA protocol are more suitable for the scenarios without aggregation node.
作者
付晓玲
关馨
苏雁泳
FU Xiaoling;GUAN Xin;SU Yanyong(Institute ofCommunication Technology,Harbin Institute of Technology,Harbin 150001,China)
出处
《无线电通信技术》
2019年第6期622-626,共5页
Radio Communications Technology
基金
国家自然科学基金面上项目(61771163)
