I. Introduction
Multimedia contents delivered to mobile clients represent a growing part of the internet traffic [1]. Even if the development of 4G networks increases the available wireless resources, high-quality video contents are increasingly demanding in terms of transmission rates. When several users share some communication link to get streamed video contents, simple bit-rate or bandwidth fair allocation strategies are usually inappropriate. Such strategies are agnostic of the rate-quality characteristics of the delivered contents. Rather static video contents such as news may be efficiently delivered with a moderate bit rate, that would be insufficient to enjoy an action motion picture of decent quality. This has motivated the recent development of quality-fair video delivery techniques, such as [2], [5], [6], [10].