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Chapter 8FINAL CONCLUSIONS8.1 IntroductionThe work presented in this dissertation has addressed the issues of digitalcommunications over the European cable communication protocol (DVB/DAVIC, ETS200 800). The focus of this work has been the performance evaluation and optimisationof the upstream channel, which is more complex to analyse when compared with thedownstream channel. This is because transmission on the downstream channel ishandled exclusively by the headend (the Interactive Network Adaptor), simplifyingoperation. In contrast, the upstream channel is a shared access medium, which usesrandom (contention), reservation and fixed access techniques. The interval distributionof the start time of these access modes is dynamic and controlled by the headend. Theboundaries of contention and reservation access are broadcast periodically in thedownstream channel. The boundary of fixed rate access is assigned to a station at thebeginning of connection. When collisions occur, a contention resolution algorithm isused to resolve them. This protocol uses two different CRAs, which are the exponentialbackoff algorithm and the splitting tree algorithm.The series of analyses presented in this dissertation have concentrated on theeffectiveness of the access modes and the CRAs defined in the DVB/DAVIC protocolspecification with the key performance issues for access and data transmission in theupstream channel. In addition, several improvements have also been introduced toextend this protocol in support of high-speed data transmissions and in particular timingcritical interactive services.8-1
Chapter 8Final conclusions p8.2 General discussionsChapter 1 presented an overview of the main characteristics of CATV networks. Hereit was highlighted that the bandwidth available in the upstream direction, makes CATVnetworks limited for the support of an increased number of users, particularly whentransmitting interactive services with high capacity. The chapter went on to give anoverview of the major measurements used in the field of performance analysis ofcommunication protocols, and provided a comprehensive review of the current researchin relation to stability of contention resolution algorithms and modelling of CATVprotocols relevant to this work. An important point here is that all contributions inresearch of performance analysis of CATV protocols have been made in the last sixyears.This chapter also discussed the contributions and novelty of this research. This projectwas started about two months after the first version of the DVB/DAVIC protocol cameout. With the exception of the work carried out in [100], most of the research found inthe literature focused on performance evaluation, improvements and optimisations forthe IEEE 802.14 and DOCSIS MAC protocols.In Chapter 2 the relevant theory was presented for this work in relation to CATVnetworks, which included a description of traditional and modern cablinginfrastructures, their differences and similarities. Here, the changes that have to be madeto upgrade CATV networks were pointed out for the support of bi-directional digitalcommunications.In addition, background material was also covered in this chapter that included anoverview of cable modem technology, possible cable modem configurations (internal,external or STB), cable modem providers and identified the requirements for the nextgeneration of communications services.This chapter also outlined the main characteristics of the DOCSIS, IEEE 802.14 andDVB/DAVIC and presented an overview of alternative technologies for high-speeddigital access, including xDSL, and FTTx infrastructures.8-2
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I would like to thank all the peopl
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CHAPTER 6: OPTIMISATIO OF CRA ALGOR
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FIGURE 5.17 - SYSTEM THROUGHPUT VS.
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LIST OF TABLESTABLE 2.1 - NEXT GENE
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Chapter 1Introduction pBecause of h
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Chapter 1Introduction pA first step
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Chapter 2OVERVIEW OF CURRENT CATVNE
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Chapter 3THE DVB/DAVIC PROTOCOL3.1
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Chapter 4Simulation and analytical
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Chapter 5Upstream channel capacity
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Page 239 and 240: APPEDIX A: GLOSSARYAALABRADSLATMBCB
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Page 243 and 244: Appendix AGlossary pUSBUWVDSLVoDVoI
Page 245 and 246: Appendix BProtocol stack and packet
Page 247 and 248: Appendix BProtocol stack and packet
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Page 255: Appendix FGuide to CD-ROM p IEEE802
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