Abstract:
Differentiated Service Network (DiffServ) provides
an architecture that is scalable and capable of differentiating
applications’ quality of service (QoS). However, it could not
control its loads under heavy traffic conditions, and it could
not achieve assured service for TCP and UDP traffic-mixes if
these flows are aggregated into a DiffServ class. This paper
investigates these problems across multiple DiffServ domains. The
paper suggests a solution that involves an Edge-Aware Resource
Discovery (RD) feedback loop and Fair Intelligent Admission
Control (FIAC) scheme for each DiffServ domain. The scheme
is characterized by two fundamental features. First, the RD loop
infers the availability of network resources, yet for scalability,
it does not involve core routers. Second, the admission control
module understands incoming traffic’s requirements, reconciles
with available resources via the RD loop, and admits traffic
intelligently according to the FIAC algorithm. Multiple-domain
control is obtained by concatenation of the RD loop and FIAC
admission for each domain along the path from a source to a
destination. Simulation results demonstrate that the enhanced
DiffServ solution can admit traffic appropriately in terms of
fairness and efficiency.
