面向M2M通信的传输控制机制与方法

Methods and Mechanisms on Transmission Control for M2M Communications

M2M通信是物联网的重要组成部分,其中基于IP的M2M通信方式实现了网络节点的统一编址、统一协调和统一管理,成为当前的研究重点和热点。传统TCP差错控制机制把数据丢失原因简单地归结为网络拥塞,并采用拥塞控制机制来解决,而忽略了无线连接存在的链路高比特误码率、拓扑频繁变化、信道非对称性、MAC协议的不公平性等缺陷,使得传统TCP不适合在高可靠性M2M通信中使用。分析了影响M2M通信的TCP因素和改进方法,以端对端连接、拆连接和混合连接3种方式分别讨论了相应的解决方案,提出了TCP在M2M通信中的改进思路和研究方向。

M2M communications are important parts of the Internet of Things（IoT）. Among them, the IP-based M2M communications achieve a unified addressing, coordinated and unified management for nodes, is also a hot research topic for many years. In traditional TCP error control mechanism, the loss of data is simply as network congestion, and con- gestion control mechanisms are used to solve these problems. The traditional TCP ignores wireless link imperfections including high bist error rate, frequent topology changes, channel asymmetry, unfairness of MAC protocol and so on. Therefore, the traditional TCP is not suitable for secure M2M communications. This paper analyzed the TCP deficien- cies and corresponding improving methods that impact the M2M communications, and discussed the appropriate solution respectively from end to end connections, split connections and mixed connections. Finally, the paper proposed TCP im- proving thinking and research directions for M2M communications.