Uç erişimli ağlar üzerinden HTTP uyarlamalı canlı video akışı için YTA tabanlı kontrol edilebilir-P2P destekli CDN

Live video services over the Internet, including over-the-top (OTT) and IPTV services, are becoming ever more popular. These services are based on the client-server model using hyper-text transmission protocol (HTTP) adaptive streaming (HAS). Since there's a maximum number of concurrent streams that a server can handle, popular solutions to provide demand-scalability include content-distribution networks (CDN) and peer-to-peer (P2P) streaming. Today OTT video services employ cloud CDN solutions to cache content in distributed edge points of presence. Cloud CDNs not only ease the load on the origin server, but also accelerate content delivery with lower latency. However, hosting or renting CDN infrastructure can be costly. Recent developments in the WebRTC protocol that offers easy to use P2P media and data channels have led to renewed interest in P2P video streaming. However, the uncontrolled nature of P2P video delivery over the Internet remains as a critical problem. In the meantime, we observe two major industry trends: i) cloud service providers are moving towards network edges for lower latency and higher bandwidth access (also known as fog computing), ii) network service providers (NSP) are replacing closed and proprietary hardware-based access technologies with disaggregated and virtualized software running on edge clouds to manage their edge access networks. Recognizing the shortcomings of current CDN and P2P video solutions and the potential of SDN-based unified cloud and edge-access network technologies, we propose a hybrid P2P-assisted CDN architecture hosted at edge-access datacenters operated by network service providers. In the proposed architecture, the NSP employs an SDN-enabled cloud platform to manage each edge network domain. An important feature of the proposed hybrid service architecture is that both the CDN access by clients and P2P video streaming between clients are controlled by the network service provider within each SDN-based edge network domain to optimize video service key performance indicators (KPI). This controllable P2P-assisted edge-managed video service reduces the load on CDN servers while overcoming quality of experience (QoE) fluctuations per flow and unfairness between multiple heterogeneous video-resolution clients over a reserved network slice. Other advantages of this service include: i) better video quality, lower delay and no buffering for clients; ii) minimization of cross-ISP traffic; iii) avoiding illegal, unauthorized usage of P2P services. Experimental results show that the proposed managed P2P-assisted CDN service deployed at SDN-enabled network edge platforms performs better than the state of the art CDN or P2P services alone according to our KPI. Finally, there are no solutions to the best of our knowledge that address all of these problems in the literature using P2P-assisted services combining SDN, WebRTC and edge computing.