Dynamic bandwidth quasi-reservation scheme for real-time services in IEEE 802.16e networks

IEEE 802.16e standard did not specify any bandwidth reservation scheme that provides quality of service (QoS) support for real-time services, especially for handover real-time ones. The bandwidth reservation schemes, which were not designed for 802.16e system dedicatedly, could also be applied to it. But their performance is our main concern. In this paper, based on the handover probability and the traffic arrival probability, a dynamic bandwidth quasi-reservation scheme (DBQRS) is proposed to provide QoS guarantee for mobile and fixed wireless real-time multimedia services in 802.16e networks. The corresponding admission control policy is also designed for this scheme. A simulation model is developed to evaluate the performance of the DBQRS using OPNET Modeler. The simulation results demonstrate that the DBQRS not only minimizes the new service flow (SF) blocking rate and the handover SF dropping rate, but also reduces the access delay of new real-time SF and enhances the bandwidth utilization.