Traffic Policing Based on Token Bucket Mechanism for WiMAX Networks

In large scale networks like the IEEE 802.16 (WiMAX), monitoring the amount of traffic within the network is an important task. By controlling the amount of network traffic, congestion can be largely decreased. Therefore, the fulfilment of Quality of Service (QoS) requirement for each traffic classis guaranteed. In this study we propose a traffic policer based on token bucket concept for WiMAX. Token bucket parameters (token rate and bucket size) are adjusted according to the traffic characteristics of each traffic class individually. Simulation results show that our traffic policing technique greatly enhances network performance. It decreases the average delay for real time traffic like rtPS, and by consequence reduces data drop probability due to missed deadlines. It also decreases data loss probability for non real time service class like nrtPS.