HAS utilizes the HTTP protocol for streaming video content and inherits the advantages of HTTP such as transparent caching and network address translation (NAT) traversal, while the underlying transport control protocol (TCP) over which HTTP objects are transported offers congestion control functionality [1].
HAS is adaptive in the sense that the quality of the video is adjusted based on the bandwidth or data rate available between the server and the client. This is a particularly useful feature for a wireless environment since the data rate of the wireless link can vary substantially over time because of physical mobility or time-varying channel impairments such as shadowing or multipath fading, and variations in other traffic served by the same base station [1].
References
[1] D. De Vleeschauwer, H. Viswanathan, A. Beck, S. Benno, G. Li, and R. Miller, “Optimization of HTTP adaptive streaming over mobile cellular networks,” in Proc. IEEE INFOCOM, 2013, pp. 898–997.
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