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Chapter 5Upstream channel capacity and characterisation p5.4.6 Effects of increasing the number of signalling framesAs introduced in Section 3.4, the description of upstream slots is contained in thesignalling (or MCI) field of the MPEG2 TS frame. According to the DVB/DAVICprotocol specification, these frames with signalling information should be transmitted atleast every 3 ms, when the upstream data rate is 6.176, 3.088 or 1.544 Mbps. Thefunction of these signalling frames is to co-ordinate the usage of the upstream slots,assign access modes, and indicate whether the reception of contention-based slots wassuccessful.In this section we discuss the maximum gain in system performance that can beobtained by increasing the number of MPEG2 frames with signalling information thatcan be transmitted within the 3 ms period.In a 3.088 Mbps upstream channel, the maximum number of MPEG2 frames (withsignalling information) that can be transmitted within the 3 ms period is either 1 or 2. Ina 6.176 Mbps upstream channel, this number is 1, 2 or 4. For this analysis, an Internettraffic configuration will be considered. The mean data rate per active station was set to32 kbps (as defined in Section 5.3.1). The simulations were performed using bothCRAs.5-27
Chapter 5Upstream channel capacity and characterisation pResults presented in Figure 5.16 indicate that by increasing to two the number ofMPEG2 frames (with MCI information) within the 3 ms period (represented by the label‘MCI-2’ in Figure 5.16) a reduction in access delay of approximately of 4.4 and 4.8 mscan be obtained for the exponential backoff algorithm and the splitting tree algorithm,respectively. This reduction can only be obtained with traffic loads under 47% (45active users) and 53% (51 active users) of the cc for the exponential backoff algorithmand splitting tree algorithm, respectively.However, for high traffic loads, lower access delays are produced with one signallingframe in every 3 ms period (represented by ‘MCI-1’). This change in access delay isbecause as the network load becomes higher than the point of saturation, there is anincreased risk of collision of reservation requests with ‘MCI-2’ (according to simulationresults), which degrades slightly the overall system performance as shown in Figure5.16.Mean Access Delay (ms)1201101009080706050403020100Backoff-MCI-1Backoff-MCI-2Tree-MCI-1Tree-MCI-23 Mbps Upstream32 Kbps kbps IPBackoff & Tree Algorithm30 33 36 39 42 45 48 51 54 57 60 63 66umber of Active StationsFigure 5.16 – Mean access delay vs. No. of active stations for different MCI values.5-28
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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 1Introduction passumption i
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Chapter 1Introduction ppolynomial b
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Chapter 1Introduction pIn general,
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Chapter 1Introduction pminislots to
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Chapter 1Introduction pThe authors
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Chapter 1Introduction prate access
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Chapter 1Introduction p1.4 Overview
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Chapter 2OVERVIEW OF CURRENT CATVNE
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Chapter 2Overview of current CATV n
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Chapter 3THE DVB/DAVIC PROTOCOL3.1
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Chapter 3The DVB/DAVIC protocol pEu
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Chapter 3The DVB/DAVIC protocol pMA
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Chapter 3The DVB/DAVIC protocol pTh
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Chapter 3The DVB/DAVIC protocol p3.
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Chapter 4Simulation and analytical
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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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