wiki:GEC15Agenda/WiMAXTutorial/StreamLoad

Version 7 (modified by Fraida Fund, 7 years ago) (diff)

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This tutorial experiment is based on "StreamLoad: Quality Video Streaming for Mobile Users," a project by Ayaskant Rath, Sanjay Goyal, Shivendra Panwar (Polytechnic Institute of NYU) and Era Jain (IIT Kanpur).

The Idea

Some Internet video content is only available for streaming: the receiver downloads a small part of the video at a time, and the entire video is never saved on the device. However, the quality of the streaming video quickly drops when the receiver moves into an area with a poor signal. Downloaded videos do not suffer from this problem, but is often not available due to potential content provider licensing restrictions.

StreamLoad is a protocol for sending layered video over cellular networks that combines the benefits of streaming and downloading.

  • Downloaded video can be of very high quality. Since content is downloaded to the device, viewing the video does not require an active Internet connection. However, some video content is not available for downloading due to content provider licensing restrictions.
  • Streaming video requires that the user has a reliable Internet connection. In streaming video, the receiver downloads a small part of the video at a time, and the entire video is never saved on the device. The quality of the streaming video quickly drops when the receiver moves into an area with a poor signal.

In StreamLoad, the base layer of the video is streamed in real time, and enhancement layers may be downloaded ahead of time. The video quality is improved because the receiver can take advantage of available bandwidth to download enhancement layers of future chunks of video, "smoothing" the effect of variations in signal quality. However, the legal requirements of streaming are satisfied because the video that is downloaded to the device cannot be played without the base layer (which is streamed).

Experiment Design

Step 1: Choose the application that you want to run on the WiMAX nodes (or create a new one)

A number of already-OMLized applications are already available.

Experiment Execution

Watch the live visualization at http://sb4.orbit-lab.org:4000

Experiment Analysis

Get the average number of layers played from the result service (use your own experiment ID): http://console.sb4.orbit-lab.org:5053/result/queryDatabase?expID=<EXPID>&format=raw&query=select%20avg%28layers%29%20from%20streamload_play

Use this link to record results: https://docs.google.com/spreadsheet/ccc?key=0AoPK6acX1JXFdDhzb0ktS2tKYkFiOF9yZVBvUm5ldUE