Cost-efficient Request Mapping for Large-scale Live Streaming Services
The live streaming landscape has shifted to a crowd-sourced paradigm, resulting in highly volatile and geographically diverse viewer demand. To handle growing traffic, Content Delivery Networks (CDNs) increasingly rely on a mix of dedicated infrastructure and lower-cost, heterogeneous edge resources. Our analysis of production data reveals two emerging characteristics in modern live delivery: dynamic regional supply-demand imbalance and per-stream heterogeneity in popularity and geography. However, existing request mapping solutions fall short in this new landscape, as they assume stable regional capacity and overlook stream-level heterogeneity. This paper proposes LiveMap , a cost-efficient and latency-aware request mapping system for live CDNs. LiveMap performs online bandwidth provisioning via dual-level coordination to resolve regional supply-demand imbalances and reduce bandwidth costs. Further, LiveMap introduces an adaptive stream mapping strategy that dynamically forms per-stream delivery groups based on real-time popularity and system load. Deployed in Bilibili CDN serving crowdsourced live streaming over a year, LiveMap reduces bandwidth costs by 42.18% and access latency by 20.26%, outperforming the state-of-the-art solutions.
Authors
- Gareth Tyson (ORCID: https://orcid.org/0000-0003-3010-791X)
- Qinghua Wu (ORCID: https://orcid.org/0000-0001-5526-4984)
- Gaogang Xie (ORCID: https://orcid.org/0000-0003-4964-1135)
- Gerui Lv (ORCID: https://orcid.org/0000-0001-6158-1345)
- Jiaxing Zhang (ORCID: https://orcid.org/0009-0005-3637-2273)
- Mingqi Liu (ORCID: https://orcid.org/0009-0004-3821-9937)
- Xi Wang (ORCID: https://orcid.org/0009-0008-2264-3863)
- Ao Li (ORCID: https://orcid.org/0000-0002-0916-2087)
- Chuanqing Lin (ORCID: https://orcid.org/0009-0001-0796-6233)
- Zhenyu Li (ORCID: https://orcid.org/0000-0002-9959-1124)
- Zhenhua Li (ORCID: https://orcid.org/0000-0001-7286-122X)
- Jie Xiong (ORCID: https://orcid.org/0000-0002-5396-4554)
- Zhi-Qun Zhong (ORCID: https://orcid.org/0009-0000-5152-0696)
- Jian Mao (ORCID: https://orcid.org/0009-0006-5747-3097)
- Yu Tian (ORCID: https://orcid.org/0009-0001-7866-120X)
Institutions
- Nanyang Technological University (SG)
- Institute of Computing Technology (CN)
- International Centre for Theoretical Physics Asia-Pacific (CN)
- Computer Network Information Center (CN)
- Purple Mountain Laboratories (CN)
- GCI Science & Technology (China) (CN)
- University of Hong Kong (HK)
- Tsinghua University (CN)
Publication Details
- Journal
- Proceedings of the ACM on Networking
- Published
- 2025-11-24
- DOI
- https://doi.org/10.1145/3768978
- Primary Topic
- Image and Video Quality Assessment
- Type
- article
- Field-Weighted Citation Impact
- 0.00