Proposta de mecanismo de CAC baseado em reservas dinâmicas de largura de banda para as redes IEEE 802.16e

Abstract

The IEEE 802.16e standard is an important technology for wireless broadband communication, which allows high transfer rates, long reach and mobility. One of its main features is the quality of service (QoS) provision for applications. This is achieved through a connection admission control (CAC) scheme, which determines whether or not a connection can be established according to the network resources availability, a traffic policing scheme and also a packet scheduling scheme, that defines which service class should be served with the higher priority, based on predetermined criteria. As the standard does not define the policies to implement these mechanisms, this work proposes a CAC mechanism for IEEE 802.16e standard, based on dynamic bandwidth reservation. These reserves are obtained by segmenting the amount of the channel s bandwidth by thresholds, which are dynamically adjusted according to the admissions of handoff and new connections. Experiments were performed through modeling and simulation, demonstrating that the proposed mechanism can avoid the waste of network resources, increases its efficiency and provide QoS, in terms of bandwidth, for applications.