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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Merged FSK PHY for 802.15.4k ] Date Submitted: [2 November 2011 ]

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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Merged FSK PHY for 802.15.4k] Date Submitted: [2 November 2011 ] Source: [Mi-Kyung Oh1, Sangsung Choi1, Kwang-Roh Park1, Matt Johnson2, Jean Schwoerer3] Company [1ETRI, 2Itron, 3Orange/Elster] Address [2111 N Molter RD, Liberty Lake, WA 99019, USA] Voice:[+1 509-891-3364], FAX: [+1 509-891-3896], E-Mail:[matt.johnson@itron.com] Re: [ Merged FSK Proposal for 802.15.4k] Abstract:[This document describes a merged FHSS PHY that addresses the requirements of the 802.15.4k PAR] Purpose:[Proposal for consideration of inclusion into the baseline for the 802.15.4k standard.] Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. <ETRI>,<Itron>,<Orange/Elster>

  2. A Merged 802.15.4k FSK Proposal • This proposal represents a merged FSK proposal from ETRI, Itron and Orange/Elster. Based on these previously presented proposals: • ETRI • 802.15-11-0609-01-004k • Itron • 802.15-11-0602-00-004k • Orange/Elster • 802.15-11-0605-01-004k • MAC features from the proposals above are not covered in this merged PHY proposal <ETRI>,<Itron>,<Orange/Elster>

  3. Agenda • Considerations for a Merged PHY • FSK Block Diagram • PHY Parameters • Study Issues <ETRI>,<Itron>,<Orange/Elster>

  4. Considerations for a Merged FSK PHY • Tunable PHY for multiple applications and regional regulations • Provide flexible options to achieve PAR goals • A path to interoperation with other rapidly deploying standards, particular 15.4g • Adopt PHY parameters that can be easily accessed by 15.4g networks <ETRI>,<Itron>,<Orange/Elster>

  5. Properties for Compatibility • The 15.4k FSK data rate must be reasonable accessible to a 15.4g coordinator (e.g. 25 kbps is one-half of the lowest 15.4g MR-FSK) • 15.4k may choose a subset of parameter values from 4g that are more “battery-compatible”, • e.g. a smaller range of choices for preamble than 4 to 1000 octets of “01010101” that make sense for a battery powered endpoint • Be accessible from 4g networks, but stay simple to support battery operation and 15.4k PAR goals <ETRI>,<Itron>,<Orange/Elster>

  6. Achieving High Link Budgets in Varying Regional Regulatory Environments • Achieving a high link budget in some regions (USA) is much easier than others (Korea USN band) • e.g. +36 dBm EIRP versus +10 dBm • In challenging regulatory environments, flexibility in PHY modes of operation may be necessary. Such as use of: • Additional spreading • FSK variants <ETRI>,<Itron>,<Orange/Elster>

  7. FSK Block Diagram <ETRI>,<Itron>,<Orange/Elster>

  8. System Block Diagram • PHY data flow SHR sequence insertion PHR Bit FSK based Modulation RF Convolutional Encoder Interleaver Spreading MUX PSDU Bit Whitening FH Function block that can be selected based on regulation and deployment environments * LECIM coordinator should support all the functions. <ETRI>,<Itron>,<Orange/Elster>

  9. PHY Parameters <ETRI>,<Itron>,<Orange/Elster>

  10. FSK Parameters In order to communicate with 4g SUN coordinator, frequency hopping should be turned off • phyFreqHopping • 0: no frequency hopping • 1: frequency hopping • phySpreading • 0: no spreading • 1: spreading • phyFECInterleaving • 0: FEC & Interleaving off • 1: FEC & Interleaving on • phyDataWhitening • 0: Data whitening off • 1: Data whitening on • phyFSKMode • 0: GFSK/FSK modulation • 1: PFSK modulation Spreading gain for reliable operation in harsh LECIM channels Already included in 4g SUN PFSK available in more challenging environments <ETRI>,<Itron>,<Orange/Elster>

  11. Frequency Bands and Data Rates • Basic features • Selection features • Frequency hopping • Spreading • Modulation (e.g. PFSK) • FCC & Interleaving • Data whitening Based on basic FSK features, selection features can be added. The system designer can determine which features are required for their applications <ETRI>,<Itron>,<Orange/Elster>

  12. Total number of channels and first channel center frequencies <ETRI>,<Itron>,<Orange/Elster>

  13. Modulation Indices <ETRI>,<Itron>,<Orange/Elster>

  14. Additional PHY Parameters * Further refinement of this value may be required as implications for battery life are studied. + Further refinement of this value may be required as implications for battery life and performance are studied. <ETRI>,<Itron>,<Orange/Elster>

  15. Addressing • Addressing needs to support entire network not just one coordinator’s PAN • Network ID across multiple coordinators • Programmed in endpoints at installation • Uplink: • Use 64 bit source address and Network ID • Downlink: • Use 64 bit source and destination address <ETRI>,<Itron>,<Orange/Elster>

  16. Study Issues Some lower level details which need to be evaluated in terms of battery operation <ETRI>,<Itron>,<Orange/Elster>

  17. Study Items • SHR • Preamble Length • SFD • Information Elements: over the air versus commissioned • Detailed Definition of MHR and PHR • Precise definition of best LQI/RSSI/… approach, such as: • MAC monitors and logs good and bad packet decodes per channel at coordinator (Channel identification provided by PHY) • PHY measures and logs: • Channel noise at the coordinator and/or endpoint • FEC Statistics • PHY shall be able to report LQI of decoded packets • Want a higher resolution indicator such as 2 dB steps of RSSI to support >120 dB link budget requirement <ETRI>,<Itron>,<Orange/Elster>

  18. Summary • This merged FSK proposal presents an FSK PHY that provides: • Flexibility for deployment in multiple applications and regulatory regimes, while • Meeting the PAR requirements for high path loss environments • Maximizing the available channel coherence time • A path to interoperability with 15.4g networks <ETRI>,<Itron>,<Orange/Elster>

  19. Thank You! <ETRI>,<Itron>,<Orange/Elster>

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