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APPEDIX E: RESULTS FOR A 6 MBPS UPSTREAMCHAELMean Access Delay(ms)10009008007006005004003002001000E xp. Bac koff Alg.6M bps Upstream64K bps IP Traffic38 40 42 44 46 48 50 52N umber of Active Station si2-t4 i3-t5 i4-t6 i7-t9 i8-t10 i5-t6 i5-t8System Throughput0.500.480.460.440.420.40a) Exponentinal Backoff Algorithm b) Splitting Tree AlgorithmE x p. B ac k off A lg.6M bps Ups tream64K bps IP Traffic0.3838 40 42 44 46 48 50 52N um b er of Active S tation si2-t4 i3-t5 i4-t6 i7-t9 i8-t10 i5-t6 i5-t8Mean Access Delay(ms)10009008007006005004003002001000Splt. Tree Alg.6Mbps Upstream64Kbps IP Traffic56 58 59 60 61Number of Active StationsEs-5 Es -7 Es -8 E s-10 Es -12 E s14 E s-15System Throughput0.6020.6000.5980.5960.5940.5920.5900.5880.5860.584Splt. Tree A lg.6M bps Upstream64K bps IP Traffic56 58 59 60 61 62N umber of Active S tationsE s-5 E s -7 E s-8 Es-10 Es -12 Es14 E s -15Mean Access Delay(ms)500450400350300250200150100500E x p. B ac k off A lg.6M bps Up9.6 K bps V oIP170 180 190 200 205 210 213N u m b er o f Active S tatio nsi3-t5 i5-t6 i5-t8 i5-t9 i5-t10 i7-t9 i8-t10Mean Access Delay(ms)500450400350300250200150100500Splt. Tree Alg.6M bps Ups tream9.6Kbps VoIP275 280 285 290 295 300 305N umber of Active StationsEs -5 Es-6 E s-8 E s-10 Es-14System Throughput0.330.320.310.300.290.280.270.260.25E x p. B ack off A lg.6M bps Up9.6 K bps V oIP170 180 190 200 205 210 213 220N umb er of Active S tation si3-t5 i5-t6 i5-t8 i5-t9 i5-t10 i7-t9 i8-t10System Throughput0.4550.4520.4490.4460.4430.4400.4370.4340.4310.428Splt. Tree Alg.6Mbps Upstream9.6Kbps VoIP280 285 290 295 300 305Number of Active StationsEs-5 Es-6 Es-8 Es-10 Es-1410000.65959000.60908000.55700856000.50805000.454000.40753000.35702000.306510000.25600.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65Normalized Offered Load0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65Normalized Offered Load0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65Normalised Offered LoadBackoff: IP IP+VoIP VoIP Tree: IP IP+VoIP VoIP Backoff: IP IP+VoIP VoIP Tree: IP IP+VoIP VoIP Backoff: IP IP+VoIP VoIP Tree: IP IP+VoIP VoIPMean Access Delay(ms)c) Performace comparison: Exponentinal Backoff vs. Splitting Tree AlgorithmSystem ThroughputFigure E. 1 – Performance optimisation and comparison of the exponential backoff algorithmand the splitting tree algorithm, for different traffic patterns and 6 Mbps Up. Channel.A-xivUtilisation(%)
Appendix EResults for a 6 Mbps upstream channel pMean Access Delay (msec)Throughput (kbits/sec)a) Effects of packet size inisochronous streams at 8 Kbps100908070605040302010040003600320028002400200016001200AB64byte-Pk128byte-Pk256byte-Pk512byte-Pk1024byte-Pk10 60 110 160 210 260 310 360 410 460 510 560Number of Cable Modems800400064byte-Pk128byte-Pk256byte-Pk512byte-Pk1024byte-Pk8Kbps streams6.17Mbps UpstreamC8Kbps streams6.17Mbps Up10 60 110 160 210 260 310 360 410 460 510Number of Cable ModemsMean Access Delay (msec)Throughput (kbits/sec)b) Effects of packet size inisochronous streams at 32 Kbps1009080706050403020100400035003000250020001500100050032Kbps streams6.17Mbps Upstream64byte-Pk128byte-Pk256byte-Pk512byte-Pk1024byte-Pk10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160Number of Cable Modems064byte-Pk128byte-Pk256byte-Pk512byte-Pk1024byte-Pk32Kbps streams6.17Mbps Upstr10 20 30 40 50 60 70 80 90 100 110 120 130 140 150Number of Cable ModemsMean Access Delay (msec)Throughput (kbits/sec)c) Effects of packet size inisochronous streams at 64 Kbps1009080706050403020100400035003000250020001500100050064Kbps streams6.17Mbps Upstream128byte-Pk256byte-Pk512byte-Pk1024byte-Pk10 15 20 25 30 35 40 45 50 55 60 65 70Number of Cable Modems064Kbps streams6.17Mbps Upstream128byte-Pk256byte-Pk512byte-Pk1024byte-Pk10 15 20 25 30 35 40 45 50 55 60 65 70Number of Cable ModemsMean Access Delay (msec)d) Channel capacity for different isochronous streams, 128-byte packe size.1009080706050403020100128-byte pkt6.17 Mbps Up8 Kbps16 Kbps32 Kbps64 Kbps10 40 70 100 130 160 190 220 250 280 310 340Number of Cable ModemsThroughput (kbits/sec)22002000180016001400120010008006004002000128-byte pkt6.17 Mbps Up8 Kbps16 Kbps32 Kbps64 Kbps10 35 60 85 110 135 160 185 210 235 260 285Number of Cable ModemsMean Access Delay (msec)e) Fixed acces vs. reservation access1009080706050403020100Reservation Slots512-Byte Pk128-Byte Pkt10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95Number of Cable ModemsFxdSlots64Kbps streams6.17Mbps UpstreamFixed & Rsrv Access128b_Fxd512b_Fxd128b_Rsv512b_RsvMean Access Delay (msec)10090807060504030201008 Kbps16 Kbps32 Kbps64 Kbps128-byte pkt6.17 Mbps Up700 850 1000 1150 1300 1450 1600 1750 1900 2050Throughput (Kbps)Channel Utilization (%)1009080706050403020100128-byte pkt6.17 Mbps Up8 Kbps16 Kbps32 Kbps64 Kbps10 35 60 85 110 135 160 185 210 235 260 285 310 335Number of Cable ModemsThroughput (kbits/sec)440040003600320028002400200016001200800400128b_Fxd512b_Fxd128b_Rsv512bb_Rsv64Kbps streams6.17Mbps UpstreamFixed & Rsrv. Access512-byte Pkt128-byte PktRsrvSlots10 15 20 25 30 35 40 45 50 55 60 65 70 75 80Number of Cable ModemsFxdSlotf) Maximum number of streams supported for different isochronous streams and packet sizesStreams 8 Kbps 16 Kbps 32 Kbps 64 Kbps 128 KbpsPk Size Rsv Fxd Rsv Fxd Rsv Fxd Rsv Fxd Rsv Fxd64 byte 130 352 67 176 32 88 ----- 44 ----- -----128 byte 230 469 116 234 56 117 26 58 ----- 29256 byte 300 >500 144 234 70 117 35 58 17 29512 byte 360 >500 194 256 95 128 48 64 24 321024 byte 325 >500 155 256 85 128 42 64 21 32Figure E. 2 – Performance analysis of isochronous streams for different packet sizes,using the exponential backoff algorithm and a 6 Mbps upstream channel.A-xv
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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 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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Page 227 and 228: Chapter 8Final conclusions pApplica
Page 229 and 230: Chapter 8Final conclusions pTCIS st
Page 231 and 232: Referencesp[17] I. Cidon, and M. Si
Page 233 and 234: Referencesp[50] N. F. Huang, C. A.
Page 235 and 236: Referencesp[85] V. Rangel, R. Edwar
Page 237 and 238: Referencesp[112] K. Sriram, “Meth
Page 239 and 240: APPEDIX A: GLOSSARYAALABRADSLATMBCB
Page 241 and 242: Appendix AGlossary pkbpsLANLLCMACMA
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
Page 249 and 250: APPENDIX C: D VERIFICATION TEST FOR
Page 251: Appendix D Verification test p209 2
Page 255: Appendix FGuide to CD-ROM p IEEE802
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