I. Introduction
Media or Video transport systems, such as the MPEG-2 Transport System (TS) [1], Dynamic Adaptive Streaming over HTTP [2], MPEG Media Transport [3], etc, are widely adopted to deliver media content for consumption from caching servers to remote users. The same content is often prepared at a variety of quality scales (i.e., at various combinations of bit rates, spatial resolutions, temporal resolutions [4]) to combat network dynamics for an uncompromised quality of experience (QoE) [5] –[7]. For conventional bandwidth-constrained applications, such as Video-on-Demand (VoD), content delivery network (CDN) strategies are usually applied to pre-cache data in close proximity for fast retrieval and better network connection [8]. Recent emerging interactive applications, such as cloud virtual reality (VR), cloud gaming, 360-degree networked-video navigation, etc, demand not only the reliable network bandwidth but also the minimum end-to-end latency. In such joint bandwidth and latency constrained scenarios, CDN caching can not resolve the problem effectively. Instead, we need to find a novel transport framework to guarantee the QoE for successful service provisioning.