Abstract: WiSE Video

In previous work by the group, a mechanism has been
proposed for in-band signaling from the network to 
the application. It uses the ECN bits of the TCP/IP
header, which are lightly utilized in practice, to 
opportunistically signal extra information. As a 
first application, the mechanism has been used for 
wireless loss notification to improve TCP performance. 
Thus, the name WiSE: "Wireless Signaling via ECN".

In this work, we use WiSE to assist rate-controlled video
transmitted over wireless links. Being able to distinguish
between wireless errors and congestion losses, a WiSE-aware 
video source is able (i) to avoid unnecessary decreases in 
the sending rate in case of wireless errors and (ii) to 
accurately adjust the error resilience for the wireless 
links. Simulations demonstrate that WiSE provides significant 
improvement in video quality over a wide range of conditions.

This is joint work with E.Setton, M.Kalman and J.Apostolopoulos.