Models for Performance Analysis in Wireless Networks
This book focuses on analyzing the delays that may lengthen the setup of a session, and disrupt or interrupt a real-time session (e.g. VoIP call, video conference, interactive game session) in wireless networks. Such delays are generated by control mechanisms. In this book, the main control mechanisms analyzed are the security and the signalling protocols necessary to set up an authorized real-time session and the mobility protocols. However the models given in this chapter and the analysis provided through the book provides insight for other new control protocols used over wireless links, specifically for their delay and throughput analysis.
The security, signalling and mobility delays depend on the time efficiency of such protocols and the way they cope with the varying quality of the wireless link. This delay is affected to various degrees by the frame error rate (FER) experienced on the wireless channel as it can be as high as 10%. Stochastic channel error models are widely used for performance evaluations of wireless protocols. The models described in this chapter allow us to abstract for the lower layers and extract only the relevant information for higher layer processing and analysis, specifically the frame error rate experienced at the link layer and its correlation degree. This type of approach permits to obtain an analysis that abstracts from the specifications provided by the physical layer (modulation and coding schemes, signal processing and so on). The analysis could thus be easily performed for heterogeneous wireless networks by selecting the appropriate data rate used on control plane, the inter-frame time or time to transmit interval, the FER range, the fading margin, the level of correlation in the error process, the link layer retransmission protocols that reflect and capture the channel behavior of the wireless networks of interests (i.e. WLAN, WiMax, GPRS, UMTS, CDMA2000).
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