A new coordinated scheduling algorithm in distributed bandwidth broker QoS architecture

Edge-limited scalable QoS flow set-up

“…Interestingly, a centralized BB model has been assumed either implicitly or explicitly in most recent work (Duan et al, 2004;Lakkakorpi et al, 2005;Krishnamurthy et al, 2005;Gunter and Braun, 1999;Hwang et al, 2004;Khalil and Braun, 2000;Lee et al, 2004;Mameli and Salsano, 2001;Pagani and Rossi, 2002;Teitelbaum et al, 1999;Zhang et al, 2002;Vivanco and Jayasumana, 2002). In other words, one logical BB entity per domain or sub-domain is assumed.…”

Joint admission control algorithm in access network

“…The common problem in Refs. [5,6] is that gathering information costs time, resulting in longer user's waiting time so that the information may become obsolete. In addition, the failure of BB node may paralyze part of the admission control function, and even give severe impact to the whole network.…”

“…[5] uses only one BB node in the whole network, which makes it scale badly when the network is large and too many traffic flows are admitted. Reference [6] uses the distributed method. It divides the whole network into several sub-domains.…”

“…In Refs. [5,6], the bandwidth broker (BB) method is utilized, which uses one BB node to collect the resources utilization rate of every router in the network and makes admission judgment according to the information. Its benefits lie in separating the admission control layer and the routing data layer and simplifying the design and burden of routers.…”