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Chapter 1Introduction pChapter 6 covers a detailed analysis of the dynamics of the two CRAs adopted by theDVB/DAVIC protocol. The analysis focuses on performance optimisations whendifferent backoff bounds for the exponential backoff algorithm and different values forthe Entry-Spreading factor of the splitting tree algorithm are considered. In addition, aperformance comparison between these two algorithms is presented. This chapter alsointroduces three enhanced CSAs (Simple-CSA, Forced-CSA and Variable-CSA) that willfurther optimise the performance of the DVB/DAVIC for different traffic configurations(e.g. Internet traffic, VoIP traffic and mixed traffic).In Chapter 7, three novel reservation request mechanisms are proposed (Reserved-Request, Unsolicited Grant Slot and Enhanced-Pure Reservation Request) for thesupport of timing critical interactive services, and their performance is compared withthe default reservation request mechanism and the three techniques presented in [101].This chapter also describes a prioritisation mechanism that will further reduce the delaycaused by contention access. In addition, the effects of using fixed-rate access andheader suppression for delay sensitive applications are studied, especially for thedelivery of VoIP streams. Finally a performance comparison between DVB/DAVIC andDOCSIS protocol is addressed.Chapter 8 presents a comprehensive analysis of the key findings, and shows how theresults could be used by either vendors or operators in order to improve networkperformance. Finally, issues of further research are outlined.1-19