基于网络编码的空间DTN LTP协议改进

Improvement of LTP Protocol of Space DTN Network Based on Network Coding

随着空间通信技术与应用的不断发展,空间DTN(Delay Tolerant Network,容延迟网络)中节点之间数据传输的重要性日益明显。针对空间DTN的可靠信息传输需求,首先介绍了空间DTN的特点及信息传输协议体系,并对LTP(Licklidcr Transmission Protocol,立克里德传输协议)进行了重点分析。然后针对空间DTN中LTP协议的缺点和不足,研究提出了基于网络编码的空间DTN LTP传输协议改进策略——NC-LTP协议,并通过数学仿真对算法性能进行了分析评估。仿真结果表明,相比于LTP协议,NC-LTP协议在不同信道传输时延、不同丢包率等条件下的适应性方面表现出较大的优势,因此NC-LTP协议更适用于具有高动态特性、高信道误码率、带宽受限的空间DTN环境。

With the development of space communication application,it is more and more important for space DTN(Delay Tolerant Networks)nodes to communicate with each other.To provide reliable data transmission in a space DTN network,the article firstly introduces the characteristics of space DTN network and its protocol stacks,especially the designs and procedures of LTP(Licklider Transmission Protocol).Then,with detailed analysis of the shortcomings of LTP protocol,we suggest an improvement of LTP protocol of space DTN network based on NC-LTP(Network Coding),and efforts were made in theoretical work and simulation of the new approach.The theoretical and simulation results show that,compared with the traditional LTP protocol,NC-LTP performed well in different situations,such as time-delay and packets loss rate,and it is suitable for use in space DTN network environment with the characteristics of high dynamics,high bit error rate and limited bandwidth.