Proposta de um mecanismo de policiamento de tráfego baseado em Token Bucket para redes IEEE 802.16

Abstract

The IEEE 802.16 standard also known as WiMAX (Worldwide Interoperability for Microwave Access) is a promising technology responsible for providing wireless broadband access to end users, fixed, mobile and with high-rate data transmission. The main feature provided by this standard to end users is the provision of quality of service (QoS - Quality of Service) through scheduling mechanisms, connection admission control (CAC - Connection Admission Control) and policing in both the base station (BS - Base station) and the subscriber station (SS - Subscriber Station). As these mechanisms are not defined by IEEE 802.16 and directly affect the performance of WiMAX networks, a considerable number of studies focusing on these topics has been proposed in the areas of scheduling and CAC. In this context it is proposed and evaluated in this work a mechanism for traffic policing based on the token bucket technique for controlling data flow generated by the stations in the network. The traffic policing mechanism is applied to all classes of IEEE 802.16d standard. A temporary storage queue was added to the proposed mechanism in order to offer to the packages of nrtPS and BE classes, which were not admitted to the network transmission at the first opportunity, a new chance of being admitted. Results based on modeling and simulation showed that the proposed policing mechanism has satisfactory performance.