Hierarchical and Breathing Peer-to-Peer SIP System
Hierarchical and Breathing Peer-to-Peer SIP System
复制标题
分层且会呼吸的点对点 SIP 系统
DOI：
10.1109/icc.2007.314
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
G. Kuo
中科院分区：
文献类型：
--
作者：
Lifeng Le;G. Kuo
基于SIP的服务与点对点(P2P)的结合可以提高传统客户端-服务器SIP系统的性能。然而，当前的P2P SIP系统有很多缺点。例如，节点异构性（如带宽、CPU、存储和正常运行时间）考虑不够，影响了P2P Overlay的可扩展性和服务可用性；会话建立延迟高于传统SIP系统；并且在长时间闲置的正常运行时间内维护 DHT 覆盖需要付出高昂的成本。为了克服这些缺点，本文提出了一种新颖的分层呼吸式P2P SIP系统。其分层覆盖由两个以上具有不同物理能力和系统可用性的子覆盖组成。基于层次覆盖，我们提出了一种节点虚拟化模型，使节点能够在更高级别的子覆盖中共享强大节点的物理能力。子覆盖采用呼吸覆盖模型，使节点能够在长时间空闲正常运行时间后暂时退出 P2P 覆盖，并在其上发起新的 SIP 服务时重新加入 P2P 覆盖。基于性能分析和模拟结果，我们提出的系统比当前的 P2P SIP 系统实现了更好的可扩展性和资源可用性，以及更短的会话建立延迟、更少的 DHT 维护流量带宽和更大的存储容量。
The combination of the SIP-based service and peer-to-peer (P2P) can improve the performance of traditional client-server SIP system. However, current P2P SIP systems have many disadvantages. For example, node heterogeneity (e.g., bandwidth, CPU, storage and uptime) has not been considered enough which affects the scalability and service availability of P2P overlay; session setup latency is higher than that of traditional SIP system; and high cost is paid to maintain DHT overlays during a long idle uptime. In order to overcome these disadvantages, this paper proposes a novel hierarchical and breathing P2P SIP system. Its hierarchical overlay is composed of more than two suboverlays with different physical capability and system availability. Based on the hierarchical overlay, we propose a Node Virtualization Model that enables a node to share physical capability of powerful nodes in higher-level suboverlays. Suboverlays adopt breathing overlay model that enables a node to quit P2P overlay temporarily after a long idle uptime and rejoin P2P overlay when new SIP services are initiated on it. Based on the performance analysis and simulation results, our proposed system achieves better scalability and resource availability as well as shorter session setup latency, less bandwidth for DHT maintenance traffic and larger storage capacity than current P2P SIP systems.