Stephen Nsoh – MSc thesis defense (17-sep-12)


SEPTEMBER 17, 2012
11:00 – 13:00
Room: D631


Date: SEPTEMBER 17, 2012
Time: 11:30 A.M. – 1:00 P.M.
Place: D631
(20 min. public presentation followed by examination)


The IEEE 802.16 standard popularly known as WiMAX is at the forefront of the technological
drive. Achieving high system throughput in these networks is challenging due to
interference which limits concurrent transmissions. In this thesis, we study routing and link
scheduling inWiMAX mesh networks. We present simple joint routing and link scheduling
algorithms that have outperformed most of the existing proposals in our experiments. Our
session based routing and links scheduling produced results approximately 90% of a trivial
lower bound.
We also study the problem of quality of service (QoS) provisioning in WiMAX mesh
networks. QoS has become an attractive area of study driven by the increasing demand
for multimedia content delivered wirelessly. To accommodate the different applications,
the IEEE 802.16 standard defines four classes of service. In this dissertation, we propose a
comprehensive scheme consisting of routing, link scheduling, call admission control (CAC)
and channel assignment that considers all classes of service. Much of the work in the
literature consider each of these problems in isolation. Our routing schemes use a metric
that combines interference and traffic load to compute routes for requests while our link
scheduling ensures that the QoS requirements of admitted requests are strictly met. Results
from our simulation indicate that our routing and link scheduling schemes significantly
improve network performance when the network is congested.

Examination Committee:
Dr. Robert Benkoczi Supervisor
Dr. John Zhang Supervisory Committee Member
Dr. Saurya Das Supervisory Committee Member
Dr. Howard Cheng Examination Committee Chair

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