HCDN: Coordinated Stream Scheduling for Cost-Effective Live Video Delivery
summary
HCDN augments a live CDN by adding ISP-edge and multi-homed nodes and a central scheduler called OpenTiga to run redirection strategies: frozen-stream offloading, cold-stream aggregation, hot-node draining, and hot-stream offload to cheaper ISP edges. Deployed incrementally across 500+ edge clusters for four years, it claims a 36% relative bandwidth cost reduction, lowers MER, keeps controller memory under 300 MB and control bandwidth <150 Mbps, and preserves or slightly improves QoE via proactive quality assurance (PQA) pre-pulls.
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chapters (14)
- 0:00HCDN and live video costs
- 1:00CDN bandwidth cost drivers
- 2:03ISP edge nodes for savings
- 3:09CDN tree topology efficiency
- 4:32Sub streams and patch streams
- 5:15Frozen streams with multi-homed nodes
- 6:58Five HCDN optimizations
- 7:40Stream scheduling challenges
- 8:28HCDN architecture and Open TIG
- 9:12Proactive quality assurance
- 9:32Four HCDN scheduling strategies
- 11:00Global deployment results
- 12:08System overhead and QoE metrics
- 12:50Conclusion