Call admission control with resource reservation for multi-service OFDM networks

Abstract

In OFDM wireless networks, the radio resources are assigned to the users based on their quality of service needs and depending on their channel quality. Thus, during a call session, the bandwidth requirements and needed radio resources may increase from negotiated call setup resources. In this study, we propose a call admission control reservation algorithm that takes such resource fluctuations into consideration. We consider two types of applications denoted by wide-band and narrow band. The performance of the algorithm is modeled through a queuing theory approach and its main performance measures are compared with a conventional algorithm through simulation. The results show that such a reservation scheme improves the call admission performance significantly in terms of QoS maintenance, especially when the network is highly congested.