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The existing active queue management (AOM) algorithm acts on subscribers and edge routers only, it does not support differentiate-serve (Diffserv) quality of service (OoS), while the existing diffserv OoS has not considered the link capacities between edge routers and connected core routers. When a core router in a two layers' network experiences congestion, the connected edge routers have no ability to adjust their access data rates. Thus, it is difficult to achieve the congestion control for the large scale network with many edge routers and core routers. To solve these problems, two difffserve AOM algorithms are proposed for the congestion control of multilayer network. One diffserv AOM algorithm implements fair link capacities of edge routers, and the other one implements unequal link capacities of edge routers, but it requires the core routers to have multi-queues buffers and Diffserv AOM to support. The proposed algorithms achieve the network congestion control by operating AOM parameters on the conditions of proposed three theorems for core and edge routers. The dynamic simulation results demonstrate the proposed control algorithms for core and edge routers to be valid.
Date of Publication: Dec. 2010