Analysis of fair scheduling and connection admission control in differentiated services wireless networks

We present a Markov-based model to analyse both connection-level and packet-level quality-of-service (QoS) measures under fair scheduling in differentiated services wireless networks. In our model, two queues are used - one for QoS sensitive traffic and the other for best effort traffic. Connection admission control (CAC) is applied to the QoS sensitive traffic to avoid performance degradation, while there is no connection admission control for the best effort traffic. We obtain connection-level QoS measures (e.g., connection blocking probability) and packet-level QoS measures (i.e., mean number of packets in queue and mean packet delay), and we investigate their inter-dependencies. Typical numerical results show that the connection admission control method can affect the packet-level QoS performance significantly. The proposed analytical model would be useful for design, analysis, and optimization of differentiated services (DiffServ) wireless IP networks.