Call Admission Control based on Adaptive Bandwidth Allocation for Wireless Networks

TL;DR

This paper proposes an adaptive bandwidth allocation scheme for wireless networks that improves call admission control by reducing handover call drops and increasing bandwidth utilization, especially for non-real-time traffic.

Contribution

It introduces a novel multi-level adaptive bandwidth-allocation scheme for non-real-time calls to enhance QoS in wireless networks.

Findings

Reduces handover call dropping probability

Increases bandwidth utilization

Achieves negligible call drops with efficient resource use

Abstract

Provisioning of Quality of Service (QoS) is a key issue in any multi-media system. However, in wireless systems, supporting QoS requirements of different traffic types is more challenging due to the need to minimize two performance metrics - the probability of dropping a handover call and the probability of blocking a new call. Since QoS requirements are not as stringent for non-real-time traffic types, as opposed to real-time traffic, more calls can be accommodated by releasing some bandwidth from the already admitted non-real-time traffic calls. If we require that such a released bandwidth to accept a handover call ought to be larger than the bandwidth to accept a new call, then the resulting probability of dropping a handover call will be smaller than the probability of blocking a new call. In this paper we propose an efficient Call Admission Control (CAC) that relies on adaptive multi-level bandwidth-allocation scheme for non-real-time calls. The scheme allows reduction of the call dropping probability along with increase of the bandwidth utilization. The numerical results show that the proposed scheme is capable of attaining negligible handover call dropping probability without sacrificing bandwidth utilization.