Dynamic aggregate bandwidth over-reservation is a scalable approach for Quality of Service (QoS) control
mechanisms, since surplus of reservation allows for admitting several flows without signaling the network. Our recent
work, the Advanced Class-based resource Over-Reservation (ACOR), shows interesting results by significantly reducing
QoS control signaling overhead with increased resource utilization without incurring QoS violation when compared with
related state-of-the-art patented solution. However, ACOR is too sensitive to the number of paths that share bottleneck
links. It also resorts to per-flow signaling when links are congested. In view of this, we propose the Extended-ACOR (EACOR),
which extends ACOR architecture with a new approach, aiming at reducing the performance dependency on
paths’ density on bottleneck interfaces. Moreover, it is able to efficiently track congestion information throughout a network
to prevent unnecessary signaling during network congestion time. Thus, E-ACOR is expected to scale large networks
with reduced signaling. Also, E-ACOR is able to keep all the benefits of ACOR in terms of support for QoS differentiation,
QoS violation avoidance and resource utilization efficiency. Analytical and simulation results demonstrate the
efficiency and cost-effectiveness of E-ACOR over ACOR, by significantly reducing signaling frequency especially during
critical periods of congestion while enabling service convergence with differentiation of the control.
Class-based bandwidth over-reservation control, Distributed network control, Congestion, Quality of Service.