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Comparatively simulation study to control congestion for wireless ATM networks

This paper focuses on the problem of congestion control in wireless ATM network. This is a practical fact that frequent handoff in Personal Communication Network (PCN) introduces the phenomena of congestion. After studying the currently used schemes, it is clear that there is some room for improvement for conventional handoff ordering schemes. A new Hybrid Scheme [Gupta et al., 2006] proposed by the authors to solve the hand off / hand over problem in ATM-based PCN, which aims to give handover calls high priority over new calls. When reservation is applied on both radio and backbone channels, it leads to significant decrease in Forced Termination Probability (FTP) with acceptable increase in Call Blocking Probability (CBP). Since the number of resources is limited (i.e. radio channels) as more channels are assigned to serve handover request, blocking probability will increase, which is obvious. Comparative simulation study carried out to show how improvement is achieved by using the Hybrid Scheme in comparison to the other schemes like First-In-First-Out (FIFO) and Measurement Based Priority Scheme (MBPS) [Tekinay & Jabbari, 1992]. The improvement reflects remarkable reduced percentage of FTP due to handover failure, when we use our proposed Hybrid Scheme.