DOWNLOAD MY Ph.D Thesis - UNAM

More documents

Recommendations

Info

Chapter 8Final conclusions pThe continuous piggyback request and the piggyback request mechanisms have alreadybeen included as part of the functionality of the DVB/DAVIC MAC protocol.The performance comparison of the enhanced-reservation request mechanisms providedin this dissertation considered fixed piggyback values (e.g. 0, 4, 8 and 12 for PG and 1,4, 8 and 12 for CPG). According to the new protocol specification these values (withthe exception of the first one, which is always fixed) could be up to 255. An additionalanalysis would be to provide a performance optimisation of the piggyback values forthese two strategies using different traffic configurations (e.g. Internet traffic, burstytraffic, VoIP, Video conferencing, multimedia traffic, etc.).The analysis of connection priorities would allow the DVB/DAVIC protocol toprioritise traffic transmissions. A connection with low priority can be reprovisioned inorder to accommodate the requirements of connections with high priority. The newprotocol specification defines up to 255 levels of priorities as indicated in Table 8.3.This functionality would require an improved scheduler algorithm at the INA, whichgives preference to connections with higher priority.Table 8.3 – Priorities for connections.ApplicationPriority valuesStandard data flow applications 0-7932 - bitIP headerUDP headerRTP headerversion IHLToSlengthID numberflagsfragmentation offsetTTL protocol header checksumsource addressdestination addresssource portdestination portlengthheader checksumv P X CC MPTsequencetime stampSSRCCSRC listIHL: Internet Header LengthToS: Type of ServiceTTL: Time To Livev: versionP: PaddingX: Extension bitCC: CSRC CountCSRC: Contributing source identifiers listSSRC: Synchronisation sourcefixed fieldvariable fieldFigure 8.1 – Fixed fields for RTP/UDP/IP headers.8-19
Chapter 8Final conclusions pApplications with QoS 80-200High priority applications 201-255In this research, most of the analysis focused on 3 Mbps and 6 Mbps upstream channels.An interesting issue is to analyse the performance when applications that demand higherbandwidth requirements are delivered using a 12 Mbps channel.Another important topic that needs to be addressed as future work is quality of servicein the downstream direction. The mapping of up to eight upstream channels onto asingle downstream channel raises the issue of congestion in the downstream too. For thetransmission of traffic that does not originate in the CATV network, for example trafficcoming from either the Internet, PSTN or other CATV network via the router/ATMswitch attached to the INA, an efficient scheduler will be required in order to prioritiseand police traffic as well as maintain maximum link utilisation in the downstreamchannel.Finally, the work presented in this dissertation is highly relevant to emerging fixed,mobile and satellite architectures [20]. Fixed wireless architectures have the sameaccess topology as CATV networks. Figure 8.2 presents three different configurationsof CATV networks with satellite, terrestrial or HFC architectures. The spectrum isdivided into different unidirectional channels for the upstream and downstreamdirection. The major difference is the physical interface. In wireless architectures, thesignals propagate through the air while in CATV networks either coax or optic fibrelinks or a combination of both is used for transmissions. The physical interface wouldbe significantly different but the MAC would be identical.CATV networks have been considered as the ideal backbone network architecture forPersonal Communications Service (PCS), as illustrated in Figure 8.2c, [50]. Thebroadcast nature of CATV networks significantly simplifies the hand-off mechanism ofmobile stations thus reducing cost and complexity at both the base station and thetelecom switch.8-20
Page 6 and 7:
I would like to thank all the peopl
Page 10:
CHAPTER 6: OPTIMISATIO OF CRA ALGOR
Page 13 and 14:
FIGURE 5.17 - SYSTEM THROUGHPUT VS.
Page 15 and 16:
LIST OF TABLESTABLE 2.1 - NEXT GENE
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
Page 39 and 40:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Chapter 3THE DVB/DAVIC PROTOCOL3.1
Page 57 and 58:
Chapter 3The DVB/DAVIC protocol pEu
Page 59 and 60:
Chapter 3The DVB/DAVIC protocol pMA
Page 61 and 62:
Chapter 3The DVB/DAVIC protocol pTh
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Chapter 3The DVB/DAVIC protocol p3.
Page 69 and 70:
Chapter 4Simulation and analytical
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Chapter 5Upstream channel capacity
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Chapter 6Optimisation of CRA using
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
Page 171 and 172:
Chapter 7PERFORMANCE OPTIMISATION F
Page 173 and 174:
Chapter 7Performance optimisation f
Page 175 and 176: Chapter 7Performance optimisation f
Page 201 and 202: aChapter 7Performance optimisation
Page 209 and 210: Chapter 8Final conclusions p8.2 Gen
Page 211 and 212: Chapter 8Final conclusions pWe have
Page 213 and 214: Chapter 8Final conclusions pperform
Page 215 and 216: Chapter 8Final conclusions pslots i
Page 217 and 218: Chapter 8Final conclusions pfocused
Page 219 and 220: Chapter 8Final conclusions preserva
Page 221 and 222: Chapter 8Final conclusions pbandwid
Page 223 and 224: Chapter 8Final conclusions pThe opt
Page 225: Chapter 8Final conclusions p8.4 Fut
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 and 252: Appendix D Verification test p209 2
Page 253 and 254: Appendix EResults for a 6 Mbps upst
Page 255: Appendix FGuide to CD-ROM p IEEE802
show all

DOWNLOAD MY Ph.D Thesis - UNAM

Create successful ePaper yourself

Delete template?

Save as template?