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Defines a fixed delay and fixed efficiency approach while avoiding PHY changes to the existing EPON MAC REPORT and GATE frames. Analyzes why direct TDMA mapping onto the RF PHY is inefficient for long PHY symbols, discusses two-dimensional scheduling complexity, and motivates a simpler solution aligned with Ethernet constraints. Covers symbol-block allocation in time and frequency and outlines alignment using downstream PLC and PHY-link feedback.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/epoc-upstream-mapping-ed-boyd-broadcom-ieee-8023bn-epoc-san-antonio-november-2012/268083/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/epoc-upstream-mapping-ed-boyd-broadcom-ieee-8023bn-epoc-san-antonio-november-2012/268083.png","ImageObject",300,407,{"name":92,"@type":93},"Mabel","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-17","2026-09-14",true,{"@type":102,"interactionType":103,"userInteractionCount":24},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What problem does the EPOC upstream mapping proposal address?","Question",{"text":112,"@type":113},"It maps EPON one-dimensional GATE times to EPoC two-dimensional OFDMA upstream, providing fixed delay and fixed efficiency without changing the REPORT or GATE frames used by the EPON MAC.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"Why isn’t direct TDMA mapping onto the RF PHY efficient for long symbols?",{"text":117,"@type":113},"PHY symbol granularity makes long symbols yield poor time/frequency granularity and efficiency, which would waste bandwidth under direct TDMA mapping.",{"name":119,"@type":110,"acceptedAnswer":120},"How are upstream symbol blocks aligned across CNUs and the CLT?",{"text":121,"@type":113},"CNUs use the downstream PLC to obtain frequency lock and a configured upstream symbol-block size, delineate aligned symbol blocks, then the CLT measures phase offset from the broadcast PHY link response to correct CNU alignment so common boundaries are 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\nOverview  \n• This presentation is a baseline proposal for mapping the EPON’s one dimensional GATE times to EPoC’s two dimensional OFDMA Upstream .  \n• This presentation is a continuation of the subject from the EPoC study group presentations for technical feasibility.  \n• This solution provides a fixed delay and fixed efficiency for the upstream .  \n• This solution does not require the EPoC PHY to make modifications to the REPORT or GATE frames currently used by the EPON MAC.  \nIEEE 802 .3bn EPoC – San Antonio, November 2012 2  \nDisclaimer  \n• The drawings in this presentation show upstream bursts carried in fixed sized blocks with multiple symbols .  \n– The burst blocks contain multiple data carrying symbols with 1 or more preamble symbols.  \n– This is the most challenging scenario to describe and it makes a colorful picture.  \n• The need for preamble symbols, the number of symbols ina burst block, and the size of the upstream symbols are not discussed in this presentation.  \n• This methodology described can be used with single symbol blocks, multiple symbol blocks, or any number of preamble symbols (including 0) .  \nThis presentation does not attempt to advocate orjustify any  \nparticular PHYlayer parameters.  \n3 Symbols Of Preamble for Red CNU Burst  \nBurst from Blue CNU  \nIEEE 802 .3bn EPoC – San Antonio, November 2012 3  \nTrue TDMA (Direct Mapping)  \nCLT OLT  \nEPON Upstream MAC Layer Burst in TQs  \nTIME  \nMultiple Carrier PHY Burst (Time & Freq)  \nWasted BW  \nC NU ON U  \nFR EQ  \nWhy Can’t we directly map TDMA onto the RF PHY?  \n• EPON MAC Layer bursts are mapped across ALL sub‐carriers.  \n• Symbol is unit of granularity for PHY.  \n• Short Symbols can have reasonable granularity and efficiency. (e.g. 1us @ 1Gbps = 125 Byte granularity)  \n• Long Symbols will have poor granularity and efficiency. (e.g. 20us @ 1Gbps = 2500 Byte granularity)  \n• Since Longer Symbols maybe required to achieve BER or provide narrower frequency control, a more complicated mapping will be considered. (The symbol size is a discussion for another presentation)  \nDirect TDMA will be too wasteful for Long Symbol PHYs  \nIEEE 802 .3bn EPoC – San Antonio, November 2012  \n4  \nTwo Dimensional Scheduling  \nMultiple Carrier PHY Bursts from 5 CNUs  \nTIME  \n• Multiple transmitters share a symbol but occupy different carriers.  \n• Different delays and efficiencies can be achieved by allocating different shapes  \n– High Latency, High Efficiency (Orange Burst) has burst overhead for 2 carriers but longer delay  \n– Low Latency, Low Efficiency (Blue Burst) has burst overhead for many carriers but data burst completes much sooner.  \n• Significant complexity is added to the PHY layer and MAC layer to support a fully flexible 2 dimensional scheduler.  \n• Bursts will arrive with different delays; Filling complex shapes is more difficult for the transmitter; The receiver must handle a complex mapping; The receiver must buffer data from multiple streams as they come in.  \nX The Ethernet MAC doesn’t support a multiple path PHY layer. (e.g. Orange starts before white and finishes after it) X Constant overhead and delay in the PHY layer is expected by higher layer protocols.  \nX EPON OLT schedulers and EPON MACs are one‐dimensional  \nWe need a simpler solution that fits with Ethernet  \nIEEE 802 .3bn EPoC – San Antonio, November 2012  \n5  \nRotating Bursts from Time to Time & Freq  \nEPON PHY Bursts (Time Only)  \n BST 1   BST 2  BST 3  BST 4   \nOLT  \nON U  \nCLT  \nC NU  \nTIME   \n8 Symbol Blocks  \nEPOC PHY Bursts (Time & Freq)  \n• TDMA EPON GATEs are mapped into time and frequency at symbol block boundaries.  \n• Symbol blocks are divided in frequency by allocating a subset of sub‐ carriers to bursts sharing the symbol time.  \nIEEE 802 .3bn EPoC – San Antonio, November 2012  \n6  \nUpstream Symbol/Burst Alignment  \n8Symbol Blocks  \nCLT  \nS  \np  \nl i  \nt  \nt  \ne  \nr  \n• CNUs must transmit i","cbCaikyOXMmdgEnp","https://ap.wps.com/l/cbCaikyOXMmdgEnp","pdf",363510,13,"English","# Overview\n# Disclaimer\n# True TDMA (Direct Mapping)\n# Two Dimensional Scheduling\n# Rotating Bursts from Time to Time & Freq\n# Upstream Symbol/Burst Alignment\n# PHY Link for Symbol Alignment\n# Time to Frequency Conversion","[{\"question\":\"What problem does the EPOC upstream mapping proposal address?\",\"answer\":\"It maps EPON one-dimensional GATE times to EPoC two-dimensional OFDMA upstream, providing fixed delay and fixed efficiency without changing the REPORT or GATE frames used by the EPON MAC.\"},{\"question\":\"Why isn’t direct TDMA mapping onto the RF PHY efficient for long symbols?\",\"answer\":\"PHY symbol granularity makes long symbols yield poor time/frequency granularity and efficiency, which would waste bandwidth under direct TDMA mapping.\"},{\"question\":\"How are upstream symbol blocks aligned across CNUs and the CLT?\",\"answer\":\"CNUs use the downstream PLC to obtain frequency lock and a configured upstream symbol-block size, delineate aligned symbol blocks, then the CLT measures phase offset from the broadcast PHY link response to correct CNU alignment so common boundaries are achieved.\"}]","EPOC Upstream Mapping - Ed Boyd, Broadcom - IEEE 802.3bn EPoC San Antonio November 2012 | PDF",1789428324,33]