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Chapter 7Performance optimisation for the support of TCIS pThe ‘Enhanced Pure Reservation Access (EPRA)’ mechanism has been designed to supportper-block transmissions and to allow a station to request slots of up to 256-ATM cells, so thatmost of the packets waiting in queue can be sent using a single reservation request. This isshown in Figure 7.3.PRA: Reservation Request = 2 SlotsEnhanced PRA: Reservation Request = 10 SlotsFigure 7.3 – Functionality of the EPRA mechanism for different packet sizes in thetransmission queue.7.2.4 Piggyback Request (PG)The ‘Piggyback Request (PG)’ mechanism avoids reservation requests between datamessages. When there are more data packets in the transmission queue waiting to betransmitted, two unused bits of the ATM header (in the upstream slots) are used to carrythe slot request. This is illustrated in Figure 7.4.Data SlotUWATMHeaderInform ation P ayloadRSG Bunused bitsbits8 7 6 5 4 3 2 1G FC VPIVPI +VCIPT CLPH E CPiggybackRequest00 -01 -10 -11 -Pg V alue 1 (0-slots )Pg V alue 2 (e.g. 4-slots)Pg V alue 3 (e.g. 8-slots)Pg V alue 4 (e.g. 12-slots)Figure 7.4 – Data slot structure with a piggyback request.7-4
Chapter 7Performance optimisation for the support of TCIS pFour states are defined. These are mapped to indicate four distinct numbers of requestedslots, for example 0, 4, 8 and 12, rather than the actual number of slots required [101].Figure 7.5 shows the mechanism regime.The PG mechanism (which is also supported by the DOCSIS protocol) tends to be veryefficient for the delivery of bursty traffic [120].PG(0,4,8,12): Piggybacked Request = 12 Slotsplaced in the last ATM cell of the first messagetransmittedPG(0,4,8,12): Piggybacked Request = 0 Slotsplaced in the last ATM cell of the first messagetransmittedFigure 7.5 – Functionality of the PG mechanism for different packet sizes in thetransmission queue.7.2.5 Continuous Piggyback Request (CPG)The ‘Continuous Piggyback Request (CPG)’mechanism allows a station to alwayspiggyback a request and prevents the station from falling back into the contentionrequest mode. This is shown in Figure 7.6. At least one slot is requested regardless ofthe state of the transmission queue. The CPG mechanism is efficient but not ideal forCBR traffic. This is because there are only four possible values for the piggybackrequest. Unused slots cause wasted bandwidth and particularly when a large number ofNIUs are active.CPG(1,4,8,12): Piggybacked Request = 12 SlotsCPG(1,4,8,12): Piggybacked Request = 1 SlotsFigure 7.6 – Functionality of the CPG mechanism for different packet sizes in thetransmission queue.7-5
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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 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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