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part_7b_HPAV_MAC - HomePlug AV MAC R Newman University of...

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HomePlug AV MAC R. Newman University of Florida
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What is HomePlug AV? Open industry standard 6+ manufacturers (including Intellon) Compatible with HP1.0 Developed 2003-2007 by Homeplug Powerline Alliance (HPA) Consortium of chip designers, OEMs, PLC users Products shipped in 2006 Most widely available ethernet class PLC 150 Mbps coded PHY data rate 0ver 40 million units shipped Comprises PHY – modulation, coupling, FEC, etc. MAC – medium access, ARQ, etc. Bridging – to other PLC networks or to 803.3/11/etc.
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Reference Model
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Protocol Layer Architecture
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HPAV Challenges Backward compatibility with HP1.0 Delivered base of over 10 million chips Return customers likely Take advantage of high speed PHY Fixed time overheads for delimiters/VCS MSDUs typically less than 1500 octets Provide QoS for video/audio/gaming/etc. Latency and jitter control Bandwidth “guarantees” Deal with PHY challenges Channels change – can degrade, cause loss Impulse noise may destroy 1-2 symbols per impulse Hidden nodes, neighbor networks
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HPAV Challenges (2) Minimize overhead Aim at 80% MAC efficiency for streams Low efficiency expected with low data rate streams User-friendly security Must be understandable Must be convenient Must be secure Stations may leave unexpectedly Consumer electronic devices Not dedicated to AVLN like AP is to WLAN
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HPAV Solution Approaches Backward compatibility with HP1.0 Maintain common VCS Take advantage of high speed PHY Maximize PHY Body length for efficiency Provide QoS for video/audio/gaming/etc. Timestamp MSDUs with QoS needs Move on if MSDU can’t be delivered on time Admission control for new QoS streams Scheduled access
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HPAV Solution Approaches (2) Deal with PHY challenges Allow tone maps to vary with line cycle Maintain view of channel rates Maintain view of stream backlogs Allow partial reception of MPDU RTS/CTS for hidden nodes Repeating for hidden nodes Redundancy for scheduling information Neighbor network coordination User-friendly security Mental models Network password entry Device password entry Push-button authorization
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HPAV Solution Approaches (3) Minimize overhead Aggregation of MSDUs, management messages Minimize use of delimiters Small addresses – 8-bit Terminal Equipment IDs (TEIs) Allow for contention-free access Integrated encryption/IV derivation Stations may leave unexpectedly Employ soft state Use negotiation for determining coordinator Allow for handover/recovery of responsibilities
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HPAV Solutions Backward compatibility with HP1.0 Hybrid delimiters – allow for common VCS Central Coordinator Allows admission control/scheduled access Must be able to move CCo/recover from loss of CCo Maintains authoritative network time base Central Beacon Provides common information
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