【摘要】 传统的DTN(Delay Tolerate Network)缓存调度策略,是根据报文的生命周期或者报文进入缓存的时间来决定报文的优先级别,并没有考虑信源节点本身的特性。针对这一问题,提出节点转发率的概念,用以表明信源节点对网络递交率的贡献。在考虑报文生命周期的同时,根据报文源节点的转发率来进行缓存调度:优先转发源节点转发率高的报文,优先丢弃源节点转发率低的报文。仿真实验表明,将该算法应用于蔓延路由,在显著改善递交率的同时,还能有效减少网络的开销。更多还原

【Abstract】 The traditional scheduling strategies in DTN( Delay Tolerate Network) is to determine the priority level of the message according to the TTL of the packet or the time the message arrives in the cache,and does not take into account the characteristics of the source node itself. Due to this problem,the concept of forwarding rate is put forward,which is used to indicate the contribution of the source node to delivery rate in networks. Considering the message’s TTL,the buffer scheduling strategy is performed according to the forwarding rate of source node. When forwarding messages,messages which have higher forwarding rate of source node are forwarded firstly. Similarly,messages which have lower forwarding rate of source node are discarded firstly. The simulation results show that,when this algorithm is applied to the epidemic routing,it can not only significantly improve the delivery ratio but also reduce the network overhead effectively.更多还原