To make the experiment reproducible and controllable,
we test it over WiFi by connecting the phone to a TP-LINK
WR741ND wireless router, instead of using a 3G connection
(given that the cellular signal strength is hard to control).
We believe this is a reasonable choice, for unit testing of
the dynamic transcoding functionality only. By installing
DD-WRT (v24-sp2 version 18007) on the router, we can have
full control over the bandwidth limit through “tc” scripts. In
our experiment, the maximum bandwidth ( ) allowed at
the wireless interface is updated every 90 seconds by setting