Service Differentiated Call Admission Control in next Generation Wireless Networks

In wireless network, real time flows are prioritized over non-real time flows. Because of this prioritization, non-real time flows endures starvation. Furthermore, real time flows are handled quite generally as no specification is given to emergency flows. To consider all these difficulties, we propose a service differentiated call admission control mechanism for next generation wireless networks. Initially, flows are classified into Transmission Priority flow (TP) and Bandwidth Priority flow (BP) using DiffServ model. TP flows denote real time flows and BP belongs to non-real time flows. Further, both TP and BP flows are again categorized into sub flows based on delay and bandwidth constraints respectively. TP flows are controlled by RIO-C queuing mechanism and BP flows are handled by Time Sliding Window (TSW) algorithm. RIO-C assigns different dropping level for each sub flows and operates independently. On the other hand, TSW manage the BP flows by controlling their packet-sending rate. Thus, our mechanism lessens the starvation of non real time flows and handles emergency calls effectively. By simulation, we prove the efficiency of our mechanism.