On the one hand, OpenFlow Queues:
Guarantee minimum and maximum bandwidth for egress traffic.
Are applied per port.
Apply both traffic policing and traffic shaping, by dropping traffic exceeding the bandwidth limit or buffering to delay packets and eliminate peaks.
Are not managed (create, delete, edit) by OpenFlow, but from OF-Config, OVSDB or specific ...
Most communication networks are designed to be centrally controlled and scheduled. CAN, OTN, SDH, FR, GSM etc.
In the cell phone network central clocks are distributed (via network typically) to every network element. All traffic is time switched on/off the network. This allows the network wide latency to be fixed and predictable.
The alternative is Ethernet/...