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Overview of CEPCA and Approach to PLC Standardization

Overview of CEPCA and Approach to PLC Standardization. July 19, 2006 Consumer Electronics Power line Communication Alliance (CEPCA) Technical Work Group [Presented by Mark Eyer, Sony]. Overview of CEPCA and Approach to PLC S tandardization Necessity of Coexistence

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Overview of CEPCA and Approach to PLC Standardization

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  1. Overview of CEPCAandApproach to PLC Standardization July 19, 2006 Consumer Electronics Power line Communication Alliance (CEPCA) Technical Work Group [Presented by Mark Eyer, Sony]

  2. Overview of CEPCAandApproach to PLC Standardization • Necessity of Coexistence • Result of collision experiment • Requirements for Coexistence • Use Case analysis • Basic system requirements • Requirements from Consumer Electronics manufacturers • CEPCA solution • Approach to standardization • Activity of Technical WG (TWG)

  3. A Definition of Coexistence • Different PLC systems must be able to operate simultaneously on a common electrical medium without degradation in performance except for the reduction in bandwidth due to fair sharing of the medium. ETSI Coexistence Workshop Kaywan Afkhamie, Intellon Corporation September 22, 2005

  4. Necessity of Coexistence Collision Experiment with Modems using Different Methods

  5. Necessity of CoexistenceConfiguration of collision experiment system • Interference tests using pseudo-transmission path • Four types (technologies) of modems • two high-speed, two medium-speed PC PC PC PC Modem A1 Modem A2 Modem B1 Spectrum Analyzer Modem B2 ATT

  6. Necessity of Coexistence: Result of collision experimentMedium-speed system (A) vs. High-speed system (B) PC PC PC PC Modem A1 Modem A2 modem B1 Spectrum Analyzer Modem B2 ATT

  7. Necessity of Coexistence: Result of collision experimentHigh-speed system (A) vs. High-speed system (B) PC PC PC PC Modem A1 Modem A2 modem B1 Spectrum Analyzer Modem B2 ATT

  8. Necessity of Coexistence: Result of collision experimentHigh-speed system (A) vs. High-speed system (B) (FDM) PC PC PC PC Modem A1 Modem A2 modem B1 Spectrum Analyzer Modem B2

  9. Summary of Collision Experiment • Physical layer speed deteriorates significantly upon collision • Demonstrates thatcoexistence is indispensable • Less deterioration if frequency bands separated • Effectiveness of frequency band division is confirmed • Time division is expected to be effective as well

  10. Spatial Isolation • Influence by interference was not observed with SNR > 30 dB • Possibility for spatial reuse of frequency PC PC PC PC Modem A1 Modem A2 Modem B1 Spectrum Analyzer Modem B2 ATT

  11. Coexistence Requirements and the Solution • Analysis of system requirements • Categorization of application areas • Definition of requirements for system specification • Basic system requirements • Requirements from CE manufacturers • Other system requirements • CEPCA solution • Specification for coexistence system • Summary

  12. Scope of PLC Applications • Access systems and In-home systems • Assumed Use Cases / applications • Assumed worldwide use • Target: systems using the 2-30 MHz band

  13. Application Areas • Use of in-building / housing complex network and in-home network • Triple play (IP broadcast watching, VoIP, internet access) • Multi-room distribution by in-home video server • Home control (security camera video, electronic locking) Entrance Internet Child's room Child's room Electroniclock PC Security camera TV ISP Audio Fiber optics VideoPhone Internet PC Printer Audio Server TV Video Server Den Living room HE CPE Transformer Access indoor (housing complex)

  14. Application – Audio PLC Audio Distribution Application  PLC rear speaker  Combination with portable audio player  Combination with PC  Multi-room distribution system PLC enables new listening styles and greater user convenience

  15. Application – Home Control & Security • Integrated control of sensors, HVAC, lighting, blinds, & security cameras • Coexistence must ensure quick response • Data transport could be lower-speed Child's room Bed room WindowBlind Lighting AirConditioner Internet Lighting Security Camera Air Conditioner Sensor Air Conditioner Electric Lock Den Living room Entrance Example of In-Home Control System

  16. Specification Required for Application Four Application Areas Coexist Video system Audio system Voice system Home control system

  17. Coexistence Requirement and the Solution • Analysis of system requirements • Categorization application areas • Definition of requirements for system specification • Basic system requirements • Requirements from CE manufacturers • Other system requirements • CEPCA solution • Specification for coexistence system • Summary

  18. Basic System Requirement 1. The system should be able to utilize powerline resources (time and frequency) efficiently and fairly • Resources are fairly distributed to access systems and in-home systems • Basic requirement: both access and in-home systems preferentially can use available resources up to50% • Resources are efficiently utilized, accommodating sharing of unused resources • Resource allocation isvariable, considering country-specific requirements • Among in-home systems, resources are distributed, focusing on efficient use • Assumes each in-home system usesminimum necessary resources for the given application • User priority is respected when available spectrum is insufficient

  19. Requirements from CE Manufacturers 2. The system is suitable for practicaluse cases / applications • Achievement of both high-speed transmission and low-delay transmission • High-speed transmission of Full-HD video stream (27 Mbps max) • Delay time of audio or VoIP (10 msec. for audio, below 20 msec. for VoIP) • Response time and reliability of operation • Expected performance of consumer electronics is maintained with PLC feature in use • No additional user complexity involved • Assumed number of systems • One Access system and several In-home systems coexist • Up to four in-home systems have guaranteed resources available • Assumed number of systems is not limited on best effort basis

  20. Other System Requirements 3. The system can be utilized worldwide • It is possible to apply to power lines all over the world • Supports specifications of countries using electric power system from single-phase two-wire to three-phase four-wire, 50 Hz or 60 Hz • The system is fair to all high-speed power line transmission technologies • Easy implementation, minimum cost increase • Band-assured system, best-effort system • The system complies with standards, and related legislation of each country • EMC-related legislation (FCC Part 15) • PSD mask, etc.

  21. Coexistence Requirement and the Solution • Analysis of system requirements • Categorization application areas • Definition of requirements for system specification • Basic system requirements • Requirements from CE manufacturers • Other system requirements • CEPCA solution • Specification for coexistence system • Summary

  22. CEPCA SolutionNecessary technology analysis for coexistence of PLCs with different systems Collision avoidance method among different systems Avoidance method Items compared Common signal among different systems - Requirements • Easy implementation (Fair among different systems) • Coverage (Equivalent to or above PLC modem) • Transmission efficiency (Little loss for bands)

  23. CEPCA SolutionCollision Avoidance Method Between Different Systems FDM/TDM hybrid • In-home systems use all bands if there is no Access system • In-home systems coexist with FDM, opening frequency band if there is Access system • Assures independency of Access system • In-home systems avoid collision with TDM • Precise band-sharing is possible freq me In - Home In - Home In - Home Access Access time

  24. CEPCA SolutionSystem Synchronization in TDM Utilization of AC zero-cross point • Common standard for PLCs of different systems • High reliability, eliminating synchronization lag by clock error freq me In - Home In - Home In - Home Access Access Access time time Sync Point

  25. CEPCA SolutionTDM/FDM Format Fine-TDM: Static slot (S-Slot) and Dynamic slot (D-Slot) • Realizes band assurance and band adjustment • Handles burst-like traffic with D-Slot alone Programmable FDM: 2MHz step size for FDM boundary • Flexibly handles area differences and future legislation TDM Unit CDCF Window of In-Home systems TDM_UNIT_LEN TDM_UNIT_LEN CDCF Window of Access system Best Effort slot TDMA slot D-Slot S-Slot 1 S-Slot 2 S-Slot 3 S-Slot 4 system 1 system 2 FDM channel freq freq TH me In-Home In-Home In-Home me In - Home In - Home In - Home ch #y Programmable Access Access Access Access Access Access ch #x time time TA

  26. CEPCA SolutionCommon Signals Among Different Systems System A System C Band assignment among systems with CDCF* Band assignment in each system System B CDCF: Commonly Distributed Coordination Function

  27. CEPCA SolutionComposition of CDCF Signals Transmission of information by with/without OFDM signal • Defines slot, based on AC zero-cross • Regards it as in-band signal, and realizes coverage equivalent to or above the modem using common hardware time Sync Point CDCF Signal A: Access indicates its existence H: In-Homes indicate their existence J : Request for join B: D-slots for Best-effort traffic #y #x A H1 H2 H3 H4 Jr Jp Ba Bb Bc D-Slot use-request indication Access systems existence indication, indicate FDM/TDM mode Time slot indication in using in-home systems Use-request indication of in-home systems (with priority)

  28. CEPCA SolutionSummary Collision avoidance mechanism of TDM/FDM hybrid Wide-range coexistence is realized with the combination of flexible TDM which doesn’t need filter and frequency-occupying FDM • Fine TDM with “D-slot” • QoS is handled flexibly with parallel use of fixed slot and variable slot • Band-assured fixed slot (S-Slot) with priority • Programmable FDM • Area differences and future legislation are flexibly handled. Common coexistence signal among different systems(CDCF) • Uses same band with PLC modem • Realizes coverage equivalent to or above the modem and part-sharing

  29. Approach to Standardization

  30. Technical Work Group—Standardization Activity Activity: Started July, 2005; 30 meetings held to date • Members: Include 7 promoting companies and 1 contributing company • 27 members (21 from Japan, 3 from US, 3 from EU) • Accomplishments: • Created coexistence technology specification • Contribute to standardization activities • JoinedIEEE P1901 WG (8 Entities), and proposed: • Use Cases • Features / technology requirements for coexistence • Joined ETSI PLT (2 Entities), and proposed: • Technology requirements for coexistence • Concept of coexistence specification • Future Plans: • Create certification specification and document an certification system • Propose coexistence technology specification to IEEE and ETSI PLT

  31. Members wanted! Visit http://www.cepca.org/for details CEPCA Thank you!

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