Node caching for content distribution in mobile delaytolerant network
Junli She, Xiangyu Bai, Qi Liu · 2017
Different countries in the world all have different degrees of communication underdeveloped areas, how to reduce “digital gap” between urban and rural effectively is one of the problems need to be solved. This phenomenon provides ample space for the development of mobile delay tolerant network because the “storage-carry-forward” communication mode in MDTN does not need the support of the network infrastructure, and MDTN can effectively compensate for the shortage of operator's network coverage. At the same time, the requirement of storage capacity of nodes in MDTN is increasing quickly. How to manage the limited cache space efficiently is the focus of the study. At present, many cache strategies have achieved some results, but the “user interest” is often easily overlooked by the researchers. Based on this phenomenon, we believe that the user interest is one of the factors that cannot be ignored in the design of caching strategies. Considering the lack of communication in remote areas, this paper combined MDTN and content center network and proposed a new node cache technology named IBCS for this hybrid network. In IBCS, we consider the user interest as the main metric to decide whether or not to cache a content. Finally, the cache technology is implemented on the ONE simulation platform. Through the experiment analysis and comparison under the real data set and the whole simulation data set, we found that the IBCS (Interest Based Cache Strategy) proposed in this paper is the best in all aspects of network performance under the same network environment.