* start: 1 2 3 (each having 1/3 of the bandwidth)
* after 3 sec: 0 1 2 (having 1/2 of the bandwidth)
* after another 2 sec: 0 0 1 (having all the bandwidth)
* start: 1 2 3 (each having 1/3 of the bandwidth)
* after 3 sec: 0 1 2 (having 1/2 of the bandwidth)
* after another 2 sec: 0 0 1 (having all the bandwidth)