Cache space efficient caching scheme for content-centric mobile ad hoc networks

Content-centric mobile ad hoc networks (CCMAN) have been demonstrated as a potential complementary to multimedia content dissemination in future wireless networks. In-network caching is one of the key techniques in CCMAN, which can significantly reduce the network traffic load and improve the content retrieval performance. However, the challenges for caching in CCMAN are that all the wireless nodes can act as users and routers simultaneously, and the caching capability of each wireless node is limited by the cache size. So caching strategies should improve not only the caching performance but also the cache space efficiency. In this paper, we study the cache space efficient caching (CSEC) in CCMAN. First, the theoretical performance of caching in CCMAN is analyzed, the cache utility is defined and derived. Then, a CSEC scheme is proposed to improve the efficiency of cache space utilization in CCMAN. Accordingly, the analytical performance of the proposed CSEC in terms of the cache utility of CCMAN is given. The network performance of the proposed CSEC is evaluated by simulation. Simulation results show that the proposed CSEC can achieve optimal performance on cache utility, which can provide a tradeoff between the cache hit ratio performance and occupied cache space