1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [FHSS Proposal]
Date Submitted: [May 12, 2009]
Source: [David Hart, Company [Elster Electricity]
Rodney Hemminger,
Bob Mason]
Address: [208 South Rogers Lane; Raleigh, NC ] Voice:[ ]
Re: [ TG4g PHY Layer Proposal]
Abstract: Proposal for new PHY layer to support g Task Group and associated PAR
Purpose: Proposal for FHSS PHY layer for FHSS addition to
Notice: This document has been prepared to assist the IEEE P 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.
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2. Proposal to 802.15 TG4g FHSS Proposal May 12, 2009 IEEE 802.15

3. Overview Goals of PAR Outline how proposal addresses PAR
Details of PHY frame changes
Important considerations to meet utility requirements

4. Scope/Goals of TG4g
Define an alternate PHY layer for with only those MAC modifications needed to support the PHY layer implementation
Support operation in any of the regionally available license exempt frequency bands, such as 700MHz to 1GHz, and the 2.4 GHz band
Data rate of at least 40 kbps but not more than 1000 kbps
Achieve the optimal energy efficient link margin given the environmental conditions encountered in Smart Metering deployments
Principally outdoor communications
PHY frame sizes up to a minimum of 1500 octets
Simultaneous operation for at least 3 co-located orthogonal networks
Connectivity to at least one thousand direct neighbors characteristic of dense urban deployments
Provide mechanisms that enable coexistence with other systems in the same band(s) including IEEE , and systems

5. Proposal to Address Goals of TG4
Define an alternate PHY layer for with only those MAC modifications needed to support the PHY layer implementation
Overview of Proposed PHY Layer
FSK modulation
400 kHz channel spacing to support higher data rates
Supports data rates of 60 and 240 kbps
Channel bandwidth requirements based on data rate (<= 400 kHz)
Programmable output power (to suit various device types)

6. Proposal to Address Goals of TG4
Support operation in any of the regionally available license exempt frequency bands, such as 700MHz to 1GHz, and the 2.4 GHz band
Proposal supports operation in 868 MHz, 915 MHz, and 2.4 GHz bands

7. Proposal to Address Goals of TG4
Data rate of at least 40 kbps but not more than 1000 kbps
Proposed PHY Layer
Supports data rates of 60 and 240 kbps
Data rate based on device type, but all devices are interoperable
Provides a low data rate for simple low end devices, while also providing a higher data rate for the powered mesh devices

8. Proposal to Address Goals of TG4
Achieve the optimal energy efficient link margin given the environmental conditions encountered in Smart Metering deployments
Proven operation in outdoor environments
Proven operation with all types of smart meters (electric, gas, water, etc)
Proven communications bridge to in-home devices
Supports communications from outdoor devices into the home
Both single family residential and multi-unit structures (e.g. apartment complexes)

9. Proposal to Address Goals of TG4
Principally outdoor communications
Communication backbone is principally outdoors, BUT it is critical to get from the meter into the home
Must get from outdoor devices into the home
Must support multi-home dwellings

10. Proposal to Address Goals of TG4
PHY frame sizes up to a minimum of 1500 octets
PHY frame supports PSDU up to 4095 octets
Support for 2048 octets with or without FEC (standard interface to MAC layer)

11. Proposal to Address Goals of TG4
PHY frame sizes up to a minimum of 1500 octets
No overhead expense for data whitening
Supports variable data whitening seed based on channel number

12. Proposal to Address Goals of TG4
Simultaneous operation for at least 3 co-located orthogonal networks
In 915 MHz band:
64 channels available for standard operation (240 kbps)
128 channels available for low data rate mode (60 kbps)
In 2.4 GHz band:
207 channels available for standard operation (240 kbps)
414 channels available for low data rate mode (60 kbps)

13. Proposal to Address Goals of TG4
Connectivity to at least one thousand direct neighbors characteristic of dense urban deployments
FHSS approach provides the functionality to meet these requirements

14. Proposal to Address Goals of TG4
Provide mechanisms that enable coexistence with other systems in the same band(s) including IEEE , , and
FHSS channel planning provides for coexistence
Proven network performance in the presence of commonly encountered interference sources
Applicable to the 868 MHz, 915 MHz, and 2.4 GHz frequency bands

15. Proposal for TG4 Items that are critical for a FHSS amendment
PHY should allow for a slower data rate for simple or power constrained devices
Data rate must provide for today’s needs but also provide for increased data needs in the future
PHY should support a high data rate similar to what allows today (250 kbps)

16. Support for Variable Data Rates
For all devices, preamble transmitted at lowest common data rate (60 kbps)
Variable length preamble
SFD uniquely identifies the data rate for the remainder of the frame

17. Support for Variable Data Rates
Powered devices that provide mesh infrastructure primarily communicate at 240 kbps
Faster data rate expected for new standard
Data rate must think forward (future proof)
Expected data requirements will increase. For example, multi-channel, 1 minute interval data provided near real time
Utility needs (i.e. Smart Grid) not limited to metering data

18. Proposal for TG4 Items that are critical for a FHSS amendment
Standard should not be limited to utility networks, but for utility networks, it must handle:
Electric
Gas (battery powered)
Water (battery powered)
Networks must function from same communication platform
Not acceptable to just co-exist
Electric, water, and gas must be interoperable

19. Proposal for TG4g Details to be added for FHSS amendment
MAC layer changes to allow battery powered (sleepy) devices to synchronize to network
Battery powered devices rely on powered devices for data transport
MAC layer details to be provided as part of TG4 effort and coordinated with TG4e

20. Conclusion Must support all utility devices and applications
Electric (many applications)
Gas and Water
Support minimal number of data rates for interoperability, but data rates that consider future needs not historical AMI
Faster data rate for large transfers in near real time
FHSS proposal can meet requirements, but significant work is required at the MAC layer to support FHSS PHY
Changes driven by 4g, but must be coordinated with 4e

21. Thank you!!