Why do we need "throughput control"?
In practice, there are many cases where multiple videos are concurrently streamed over a same network connection with limited bandwidth. A common example is when people in a same local network (e.g., home, office) watch online videos at the same time. Another example is camera surveillance system where a large number of video feeds from surveillance cameras is streamed to a processing data. In addition, those video streams may have different characteristic (e.g., bitrates) or have different levels of importance. Thus, it is desirable to be able to allocate available network bandwidth in an efficient manner. For instance, in case of camera surveillance system, video streams from important cameras should have higher throughput than those from less important ones.
Why application layer matter?
In our previous work [1], we successfully control throughput of streaming client by adjusting TCP flow control window size. However, it may not always possible to perform such control in practice, such as in browser-based streaming, or in mobile devices. Thus, it is desirable to be able to control throughput at application layer.
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