Content distribution network for mobile streaming media

摘要

In this paper, we present a mobile streaming media CDN (Content Distribution Network) architecture in which content segmentation, request routing, pre-fetch scheduling, and session handoff are controlled by SMIL (Synchronized Multimedia Integrated Language) modification. In this architecture, mobile clients simply follow modified 5MW files downloaded from a streaming portal server; these modifications enable multimedia content to be delivered to the mobile clients from the best surrogates in the CDN. The key components of this architecture are 1) content segmentation with 5MW modification, 2) on-demand rewriting of URLs in 5MW, 3) pre-fetch scheduling based on timing information derived from 5MW, 4) 5MW updates by SOAP (Simple Object Access Protocol) messaging for session handoffs due to clients mobility. The current status of our prototyping on a mobile QoS testbed "MOBIQ" is also reported in this paper. We are currently designing the SOAP-based APIs (Application Programmable Interfaces) needed for the mobile streaming media CDN and building the CDN over the current testbed.