Load balancing mechanism of service control server cluster in IMS-based IPTV
Lingnan Li · Journal of Computer Applications · 2010
IMS-based IPTV not only requires higher performance of Service Control Function ( SCF) server, but also brings many restrictions to the traditional load balancing technologies due to a Session Initiation Protocol ( SIP) with double integrity requirements of transaction and dialog. Combining service trigger mechanism in IP Multimedia Subsystem ( IMS) and the session statistical characteristic of the IPTV services, a multi-level load balancing mechanism with the features of service differentiation among clusters and server-load awareness within every cluster was discussed to solve the performance bottleneck in IPTV SCF, and a method differentiating SIP transaction priorities and a lightly random scheduling algorithm based on a dynamic weight were proposed. Finally, the technological feasibility was verified in IPTV prototype, and the detailed solution was depicted.