Common Radio Resource Management: Joint Call Admission Control And Traffic Offloading Method
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Date
2018-07
Authors
Mohd Zaini, Khuzairi
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The concept of Common Radio Resource Management (CRRM) has been proposed
by 3GPP in order to efficiently manage the common pool of radio resources that are
available for each of the existing radio access technologies in the heterogeneous wireless
networks (HWNs). The main challenge of CRRM for HWNs is to search the best
connection for the demanded services, enabling calls transference from one interface to
another seamlessly and utilizing the availability of all radio resources. Thus, this thesis
proposes a joint call admission control (JCAC) and traffic offloading algorithms in the
CRRM for an integrated cellular and mobile network. The contributions of this work
are threefold. First, a user mobility model in the wireless overlay network is proposed.
The equation of dwelling time in the WLAN is derived and the probability of moving
out from the coverage area and its sojourn time is calculated. Next, the vertical handoff
(VHO) rate equation is produced. The performance is assessed analytically using
the theory of continuous time Markov Chain (CTMC). Second, JCAC comprises of
initial network selection and VHO is proposed. User mobility, usage duration, service
characteristics and system load have been incorporated in the JCAC decision making
parameters and evaluated by using three dimension Markov Chains. Third, traffic
offloading algorithm is introduced in the proposed CRRM. An analytic hierarchy process
(AHP) is applied for weight assignment to the decision making criteria and the
cost function is used for the user’s selection in the offloading algorithm. The tradeoff
between different system performance metrics are examined between proposed CRRM
scheme with and without offloading. Results obtained show that the proposed JCAC
scheme reduces the new and VHO calls blocking probabilities by 24% and 95% respectively,
and increases 11% of the overall system throughput.
Description
Keywords
The concept of Common Radio Resource Management , efficiently manage the common pool of radio resources