Cooperative Routing Approach for ISP-Provided Content Delivery Service Using Hierarchical DHT

This paper suggests ISP-provided content delivery service that provides fine-grained locality and exploits network status in content routing to overcome the dilemma from current content delivery technology like P2P. Hierarchical DHT provides an efficient and scalable distributed data service architecture and it is able to achieve high level of locality over ISP network which has a hierarchical topology in general. However, simple implementation of it into ISP network imposes several issues: long query length, overloading, and the ignorance of network status in routing which is one of strengths of ISP-provided service. In order to resolve the aforementioned issues, this paper introduces network domain heuristic based merging and dynamic cost-based cooperative routing that exploits service load and network cost together. According to simulation based evaluation, our proposed approach achieves around 40% shorter latency in both delivery and query. Furthermore, it can alleviate overloading and content delivery through contested path efficiently.