The survey of service nodes placement theories for content networks

By deploying service nodes, which composed by multiple servers in diverse geographical locations, to form the overlay network, Content Networks can effectively reduce the gap between the demand of ever-emerging application for network diversity and the property of the best effort for Internet. It has been the research focus in academy and industry. The deployment of service nodes, one of key problems in content network, affects directly the quality of service (QoS) and operational efficiency of the overlay network. However, with the development of Internet and network application, the environment of content networks, QoS requirements and the relationship with network operators have changed, the traditional deployment theories face many new challenges. Recently, how to improve the existing service nodes deployment theory has become a hot issue. In this paper, we systematically survey the existing service node deployment theories and their applications, address the challenges faced. For the challenges, we also present the research tendencies and the potential solutions in final.