Research And Implementation Of Wireless Distributed Storage Platform Based On Content Coding

Wireless distributed storage systems can potentially relieve the burden of the wireless access point caused by the rapidly increasing mobile users and emergence of network services.The efficient and reliable content sharing between mobile users can increase wireless service response speed and reduce the pressure of data traffic on the wireless access point.The research of distributed storage technology includes content placement and content delivery.In the stage of content placement,the Topic-Sensitive PageRank based Content Placement Algorithm is proposed according to the quality of physical links and social relationships between users to choose proper users for placing the content.In the content delivery stage,the problem of selecting proper content providers(helpers)for requesters is modeled as the bipartite graph matching problem.The proposed Expand Kuhn-Munkres based Content Helper Selection Algorithm is taken as the strategy by integrating the physical link and social factors as the corresponding edge weights.Through the above two stages of joint strategy,we improve the transmission success rate of the system.Specifically,considering the concept of distributed system and user mobility,we demonstrate an erasure code based wireless distributed storage system(WDSS),which is well designed to handle storage capacity limitation,power limitation and data loss caused by the disconnection from wireless users.The demonstration of the system consists of 3 components,a WDSS server,a wireless AP and the user application.Furthermore,both openWrt based Wi-Fi access and OpenAirInterface(OAI)based cellular access can be implemented by the wireless AP.The system constructs a wireless distributed storage network,and realizes an effective and reliable content sharing mechanism,including content placement,content delivery,loss content fragmentation repair and so on.The system verifies the feasibility of the cache mechanism based on erasure codes,provides a wireless distributed storage system prototype based on erasure codes,and excavates deeper theoretical research points and application scenarios.