Performance Analysis of Adaptive Joint Call Admission Control to Support QoS in Heterogeneous 4G Wireless Networks

Jacqueline john, Nada Mustafa

Abstract


Call admission control (CAC) is one of the basic mechanisms for ensuring high quality of service
(QoS) offered to the user in Wireless Heterogeneous Networks (HetNet). Based on the available network resources,
it estimates the impact of accepting or blocking a new session request. Many CAC algorithms have been proposed in
the literature but they were all limited by the available bandwidth. This paper analyses the bandwidth adaptation
technique for the Adaptive Joint CAC (AJCAC) algorithm; it is proposed as a solution for congestion; where the
AJCAC algorithm degrades the bandwidth of some ongoing users to make room for new incoming ones. A
restoration process must take place when the network is underutilized; where the algorithm restores the maximum
bandwidth service to the degraded users. In this paper the bandwidth degradation process was investigated and
evaluated using a system-level MatLab simulation. The results showed that as the degradation in the bandwidth
increases the adaption required in the network increases. On the other hand, degradation in the QoS results in a
decrease in the blocking probability.

Keywords


Heterogeneous Networks, Call Admission Control, Bandwidth Adaption, QoS Restoration, QoS Degradation, Congestion

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