Abstract: Deploying the replications of popular content in the edge network through the content diffusion system can effectively alleviate the load on the backbone network. Because the capacities of terminals and the interests of their users may differ, the content diffusion strategies need to fully consider the heterogeneous. This paper proposes a layered topology of network and a decentralized content diffusion strategy to deploy the replications. Based on the capabilities, load and interests of terminals, this paper further optimizes the diffusion of content. The optimization strategy includes the adjustment of target of diffusion based on the interest features, the heuristic caching node selection strategy, the coverage rate-aware selection of transmission content and transmission load-aware selection of receiving node. Experimental results show that the optimized diffusion system can provide a more stable success rate of services, improve the probability of local services by about 25.5%, and reduce the time to complete the diffusion of content by about 7.6%.

Key words: heterogeneous edge network, content diffusion, decentralized, adaptive adjustment, transmission strategies