Illustration of a mobile video streaming service in a heterogeneous wireless network. In location 1, the user experiences video glitches as the cellular link is unable to support the video streaming well. Then, the user requests to the video server and simultaneously connects to the WLAN access point in location 2. However, the video quality further degrades in the dual mode as the WLAN link is unstable. Then, in location 3, the user switches the WLAN to WiMAX, and the perceived quality is better than that in locations 1 and 2.