On The Capacity Of Large Scale Wireless Networks With Content

In recent years,with the rapid development of wireless communication technology,large scale wireless ad hoc networks because of its characteristics of no center,self-organization,multi hop routing,is widely used in environmental monitoring,military action,post disaster reconstruction etc.The huge potential of the wireless ad hoc networks has been limited due to the expansion of the network size.Therefore,the capacity of wireless ad hoc networks has been concerned by many scholars both at home and abroad.Study on the capacity of wireless ad hoc networks and give up to limit the network capacity under specific the routing and scheduling strategy guiding significance for the design of wireless self-organizing network architecture and fully explore the potential of Wireless Ad Hoc Networks.In this paper,we mainly consider the capacity of large-scale content-centric wireless networks.We analysis capacity of the network under different transmission modes and gives the specific routing and scheduling strategies。For the unit capacity of large scale content-centric hybrid wireless staic networks,the paper research the capacity under different content access sceheme when the network users(nodes)are equipped with a local cache to hold the copies of content object,and users aim to retrieve the content stored in the network rather than maintain source-destination communication.Content caching has been previously proposed to improve the availability of contents in a network and thus helps to alleviate the load on content custodians,reduce access latency,and improve the network capacity.We propose the homogeneous content access scheme and heterogenous caching access scheme and hybrid transmission mode which can be switched each other.Each content is requested and cached with equal probability under homogeneous content access scheme;Under heterogenous caching access scheme,the cached probability of each content is different and the requested contents follow content popularity distribution.We present the closed form capacity for-mulae for the two different content access schemes in order sense,respectively.We also discuss the impact of the number of nodes,the number of base stations and cache capacity on the capacity scaling.For the multicast capacity in content-centric wireless ad hoc networks,the paper studies the upper bound of the multicast capacity in content-centric hierarchical routing strategy.We establish the upper bound on multicast capacity of content-centric wireless ad hoc networks with homogeneous hierarchical routing strategy and heterogenous hierarchical routing strategy and discuss the impact of the number of nodes,the number of users,cache size and the probability of cache on the capacity scaling.Finally,based on the conclusions obtained in this paper,we compare and analyze the capacity of the wireless network with the existing scheduling policy and routing scheme.