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

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.