Second-order adaptive bandwidth allocation to control delay of multicast multimedia streams in DiffServ router

The proposed ABA scheme uses the queue occupancy as a feedback to adaptively allocate the bandwidth for each queue of EF PHB. Because the allocated bandwidth converges to the corresponding input traffic, ABA remains the queue dynamics steadily. The feedback gain is used as an operational parameter to determine the steady state of each controlled queue. The characteristics of the steady class queue show the valuable features: (1) the constant queueing delay in router (2) the alleviated queue management. The packet delay controllability in each DiffServ router is vital to synchronize delivery delay of different routes. For multicast streaming service, ABA compensates the delay differences of clients to synchronize the time of packets arrived at clients. The simulation results show that ABA effectively improves the delay controllability and enhance the reliability of streaming services.