Design of a new globally stable explicit rate controller for ABR service with saturation

Authors:
Y. B. Duan;C. Y. Wen;B. H. Soong
Affiliations:
School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore, Singapore 639798;School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore, Singapore 639798;School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore, Singapore 639798
Venue:
Computer Communications
Year:
2002

Citing 6
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Abstract

In this paper, we consider the closed-loop rate-based flow control for available bit rate (ABR) service in asynchronous transfer mode (ATM) networks, where the ABR sources adjust their transmission rates in response to feedback explicit rates (ER) from the network switches. The feedback ER may be saturated due to the peak cell rate (PCR) and the minimum cell rate (MCR). The buffer occupancy state of the network switch can also be saturated due to the buffer occupancy. To solve saturation nonlinearity problem and analyze the stability globally, a new ER controller is designed, which is composed of a nonlinear controller and a linear controller. The nonlinear controller is employed to bring buffer occupancy state inside the buffer saturation limits and ensure ER value between PCR and MCR. The linear controller is used to ensure that the buffer occupancy state converges to the desired buffer state. Finally, we demonstrate that good transient and steady-state performances can be achieved through a numerical example.