Autonomous Decentralized VoD System Architecture and Fault-Tolerant Technology to Assure Continuous Service

In distributed and ubiquitous computing systems, not only the composing subsystems and their functions, but also the system structure would be changed constantly under the evolving situation. With the advances of compression, storage and network technologies, Video on Demand (VoD) service is becoming more and more popular. However, it is difficult for conventional systems to meet the continuous and heterogeneous requirements from service providers and users simultaneously. This paper introduces an autonomous decentralized VoD system sustained by mobile agents for information service provision and utilization. Under the proposed architecture, autonomous fault detection and recovery technologies are proposed to assure continuous service. The effectiveness of the proposed technology is proved by the simulation. The results show that an average of 30% improvement in recovery time and users´ video service can be recovered without stopping compared with the conventional system.