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Chapter 3The DVB/DAVIC protocol p• Contention slots: are accessible for every station to send reservation requestscollisions are possible and solved by a contention resolution algorithm. Theseslots can also be used to send user data on low traffic loads, if this is enabled bythe INA.• Reservation slots: the user sends control information announcing his demandfor transmission capacity. He gets grants for the use of slots.• Fixed slots: are used for CBR traffic, these slots provides the best results in QoSregarding delays, jitters and loss of upstream data units.The slot structure is based on two Slot Configuration Fields (SCF). Each SCF describes9 slots in the order presented in Figure 3.6a (ranging, contention, reservation and fixedslots). The number of ranging slots transmitted during a long period of time (e.g. 60seconds) is insignificant, compared to the number of contention, reservation and fixedslots transmitted, and the performance of the network does not change if the rangingslots are not used at all. Thus, the use of ranging slots will not be considered in thesignalling frame structure for performance analysis.Furthermore, since fixed slots may or may not be supported in the first version ofEuroModem (class A), the performance analysis to be addressed in the followingchapters will be based mainly on signalling slot structures that consist of contention andreservation slots, as depicted in Figure 3.6b. In this structure the contention andreservation slots have been rearranged so that all contention slots are described in thefirst SCF, and in the second SCF when SCF1 describes only contention slots. This newarrangement decreases slightly the processing times of the INA and NIUs.As pointed out in Section 3.5.3, if the splitting tree algorithm is used to resolvecollisions, one contention-based slot is divided into three independent minislots thatcarry shortened request messages, as depicted in Figure 3.6c. When this algorithm isused, the number of contention slots described in the first SCF (or SCFs) can bedecreased.In general, the slot structure presented in Figures 3.6b and 3.6c will be used when theexponential backoff algorithm and the splitting tree algorithm are selected, respectively.3-12
Chapter 3The DVB/DAVIC protocol p3.6 ConclusionsAn overview of the evolution of the European DVB/DAVIC Cable CommunicationSystem has been provided. In the early stages of the cable data networks, the DVBgroup in collaboration with the European Cable Communication Association brought asignificant value for the broadcast data-services organisations by providing the set ofspecifications for the return channel (ETS 300 800, ETS 200 300, EuroModem,EuroBox) that will enable cable network operators to provide the next generation ofinteractive services.In this chapter we have also presented the network architecture and the majorconstituent components of the DVB/DAVIC protocol, which represent the mostimportant elements that describe this standard. Here the basic operation at the physicallayer and the Media Access Control layer were described along with the functionality ofthe contention resolution algorithms adopted.The definition of the MAC layer was important, since spectrum of cable networksavailable for upstream transmissions from subscribers to the headend is scare. As a finalremark, the DVB/DAVIC protocol fits optimally into a cable environment and providesan integrated solution for full-interactive service provision.3-13
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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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Page 17 and 18: Chapter 1Introduction pBecause of h
Page 19 and 20: Chapter 1Introduction pA first step
Page 21 and 22: Chapter 1Introduction passumption i
Page 23 and 24: Chapter 1Introduction ppolynomial b
Page 25 and 26: Chapter 1Introduction pIn general,
Page 27 and 28: Chapter 1Introduction pminislots to
Page 29 and 30: Chapter 1Introduction pThe authors
Page 31 and 32: Chapter 1Introduction prate access
Page 33 and 34: Chapter 1Introduction p1.4 Overview
Page 35 and 36: Chapter 2OVERVIEW OF CURRENT CATVNE
Page 37 and 38: Chapter 2Overview of current CATV n
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Chapter 5Upstream channel capacity
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Chapter 6Optimisation of CRA using
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Chapter 7PERFORMANCE OPTIMISATION F
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Chapter 7Performance optimisation f
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aChapter 7Performance optimisation
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Chapter 8Final conclusions p8.2 Gen
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Chapter 8Final conclusions pWe have
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Chapter 8Final conclusions pperform
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Chapter 8Final conclusions pslots i
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Chapter 8Final conclusions pfocused
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Chapter 8Final conclusions preserva
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Chapter 8Final conclusions pbandwid
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Chapter 8Final conclusions pThe opt
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Chapter 8Final conclusions p8.4 Fut
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Chapter 8Final conclusions pApplica
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Chapter 8Final conclusions pTCIS st
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Referencesp[17] I. Cidon, and M. Si
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Referencesp[50] N. F. Huang, C. A.
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Referencesp[85] V. Rangel, R. Edwar
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Referencesp[112] K. Sriram, “Meth
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APPEDIX A: GLOSSARYAALABRADSLATMBCB
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Appendix AGlossary pkbpsLANLLCMACMA
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Appendix AGlossary pUSBUWVDSLVoDVoI
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Appendix BProtocol stack and packet
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Appendix BProtocol stack and packet
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APPENDIX C: D VERIFICATION TEST FOR
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Appendix D Verification test p209 2
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Appendix EResults for a 6 Mbps upst
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Appendix FGuide to CD-ROM p IEEE802
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