应急通信场景下基于DTN的可靠消息传输机制

为了提升应急通信场景下各救援群体之间消息传递的可靠性和效率，针对网络连接的断续性和业务应用的特殊性，提出了一种基于延迟容忍网络（DTN）的可靠消息传输机制(DTN based Reliable Message Transmission Scheme,DRMTS）。DRMTS充分考虑了应急救援群体的业务特点、移动模式和传输方式，有效整合了消息发布/订阅模型、DTN路由算法和缓存管理策略。首先，通过基于内容分类的发布/订阅模型合理调度应急消息的高效分发；然后，采用了基于群组移动模式的泛型喷射DTN路由算法提高消息投递的可靠性；同时，引入基于消息内容重要性的缓存管理策略以确保重要消息的优先传输。仿真实验结果表明，相比传统DTN路由算法和经典FIFO缓存策略，DRMTS在消息投递率、传输时延和控制开销等性能指标上均有显著改善，增强了消息传输的可靠性。

DTN based reliable message transmission scheme in emergency communication scenarios

Abstract: In order to improve the timeliness and reliability of message delivery among emergency rescue groups in emergency communication environment, a delay tolerant network (DTN) based reliable message transmission scheme (DRMTS) is proposed aiming for the intermittent emergency network connections and the particularity of service applications. DRMTS fully considering the service characteristics, mobility model and transmission mode of emergency rescue group, effectively integrates the message publish/subscribe model, DTN routing algorithm and cache management strategy. Firstly, it uses the publish/subscribe model based on content classification to reasonably schedule the efficient distribution of emergency messages. Secondly, it adopts a generic spray DTN routing algorithm based on group mobility mode to improve the reliability of message delivery. At the same time, it follows a cache management strategy based on the importance of message content to ensure the preferential transmission of important messages. Simulation results show that, compared with the traditional DTN routing algorithm and classic FIFO caching strategy, proposed DRMTS has significant improvement in message delivery rate, transmission delay and control overhead, enhancing the reliability of message transmission.