Abstract
Mobile broadband networks are continuously faced with the challenge of limited resources due to the increasing demand for high speed Internet services. To manage these resources, call admission control (CAC) which determines whether or not a connection request should be accepted or rejected is one of the resource management techniques usually deployed. A Dynamic QoS-aware CAC algorithm was recently proposed to improve resource utilization. However, the algorithm detects congestion of the network only after it has occurred, which leads to increase in blocking probability and thus lead to reduction in throughput. In this paper, a congestion control call admission control (CC-CAC) algorithm is proposed to reduce call blocking and increase throughput of all connection classes. The CC-CAC employs a congestion control mechanism that regulates the base station buffer to operate at a target threshold. It also employs a dynamic bandwidth degradation mechanism to degrade the resources of the admitted connections when resources are not sufficient to admit more connections. The algorithm is evaluated using simulation. The results show that the proposed scheme outperforms the benchmark scheme in terms of decrease in blocking probability and increase in throughput for all connection classes.
Highlights
The proliferations of mobile devices such as mobile phones, smart phones, and tablets and advancement in wireless technologies have led to increase in demand for Internet services such as voice over Internet protocol (VoIP), video streaming, internet surfing, and online gaming etc. by users, anywhere and anytime
call admission control (CAC) admits or rejects a new connection request if the required quality of service (QoS) of the new connection request will be met without lowering that of the ongoing calls [5]
To fix the shortcoming highlighted above, we propose a Dynamic QoS-Aware CAC algorithm with co congestion control to prevent resource wastage and increase overall system throughput
Summary
The proliferations of mobile devices such as mobile phones, smart phones, and tablets and advancement in wireless technologies have led to increase in demand for Internet services such as voice over Internet protocol (VoIP), video streaming, internet surfing, and online gaming etc. by users, anywhere and anytime. The technology deploys a set of radio resources management techniques to effectively manage the network resources [4] in order to achieve the QoS requirements. These techniques consist of scheduling and call admission control (CAC). The algorithm deploys a congestion control mechanism to determine the level of congestion in the network at every point It uses a dynamic bandwidth degradation mechanism to admit more connections into the network when resources are inadequate. The simulation results indicate that the proposed CC-CAC surpasses the compared scheme in terms of decrease in blocking probability and increase in throughput for all connection classes.
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