Abstract
In order to optimize the timeliness and pertinence of message delivery in emergency rescue scenarios and improve the service performance of emergency communications network, we propose a location-assistant content distribution scheme based on delay tolerant network. First of all, considering that the movement patterns of rescue teams tend to follow a predetermined course of action, we design a location-based group mobility model. Due to the intermittent network connectivity and variety of emergency service, a content-classification-based publish/subscribe architecture and a GenericSpray routing algorithm based on the prediction of overlap opportunity in spatio-temporal positions are proposed. Furthermore, we also give a cache management strategy based on the content significance. Since location-assistant content distribution scheme can predict the overlap of activity between rescue teams through the course of action, not only can the number of copy forwarding and message delivery delays be significantly reduced but also the priority delivery of important messages can be ensured by message classification. Simulation experiments show that compared with the traditional delay tolerant network routing algorithm and the classic first-in-first-out caching strategy, location-assistant content distribution scheme improves the performance of message delivery rate, transmission delay, and control overhead significantly.
Highlights
Nowadays, frequent emergencies have brought huge loss to human beings, and how to provide various emergency communication services for emergency rescue workers quickly and effectively has become an important issue which needs to be solved urgently.[1]
According to the above analysis, we propose a location-assistant content distribution scheme (LACDS) based on Delay tolerant network (DTN)
To reflect the unique mobility characteristics of rescue team in the emergency communication scenario, based on the traditional group mobility model, we introduce the course of action to it, and nodes finish their assembly and rescue activities according to the predetermined positions and course of action
Summary
Frequent emergencies have brought huge loss to human beings, and how to provide various emergency communication services for emergency rescue workers quickly and effectively has become an important issue which needs to be solved urgently.[1]. The mobility of rescue teams is usually regular and consistent with the predetermined course of action, so we can improve the pertinence of message delivery and reduce the message delivery delays by predicting the overlap area and time of active locations between the rescue groups. LACDS enhances the reliability and timeliness of emergency message delivery by taking full advantages of the location information provided by the course of action. LACDS absorbs the idea of locationbased services (LBS) and ensures preferential delivery of important messages by the categorization of classification, effectively improving the efficiency of message transmission and providing reliable and robust communication services for information exchange and coordinated actions among rescue teams. Section ‘‘Conclusion’’ summarizes the work and points out the direction for future work
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