1. W-SUN Technical Requirements Discussion
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [TG4g Technology Requirements Discussion]
Date Submitted: [19 January 2009]
Source: [Jana Van Greunen] Company [Silver Spring Networks]
[Address [] Voice[]
Re: []
Abstract: Discussion of TG4g Technology Requirements
Purpose: Contribution to Task Group
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.
Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P
11/8/2018
W-SUN Technical Requirements Discussion

2. Technology Requirements
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W-SUN Technical Requirements Discussion

3. W-SUN Technical Requirements Discussion
Purpose
Discuss the Wireless Smart Utility Metering application properties and how they may shape W-SUN technical requirements
Revisit the application properties presented to the IEEE and contained in the W-SUN scope
Discuss which key technical requirements each application requirement may impact
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W-SUN Technical Requirements Discussion

4. W-SUN Technical Requirements Discussion
Purpose and Need
Global standard for utility smart grid applications
Energy Independence & Security Act of 2007 (US)
National Institute of Standards and Technology (NIST) to work with standards bodies (such as IEEE) to develop protocols and standards for the smart-grid network
Similar efforts globally
EU 20/20/20 includes need for SG standards
Proprietary wireless solutions deploying
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W-SUN Technical Requirements Discussion

5. Application Requirement Re-Cap
Ubiquity
Every customer connected
Multiple per customer premise, multiple in-home connections
Extreme range of node density from sparse to dense (1/acre- 1000’s/acre)
Both link range and network footprint need to be adaptable
Work in rural and urban deployments
Presence of other wireless systems (lots of them)
Cost constrained (unlicensed bands)
Low data rates and latency tolerant (for many applications)
Large packets/support for IP
Ease of commissioning (highly autonomous)
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W-SUN Technical Requirements Discussion

6. W-SUN Technical Requirements Discussion
W-SUN Scope
Alternate PHY and associated MAC amendment
License exempt frequency bands
Low data rate: 40 kbps to 1000 kbps
Optimal link margin given the SUN environmental conditions
Principally outdoors, but also in basements, around corners…
PHY frame sizes up to a minimum of 1500 octets
Potentially dense deployments: at least 1000 direct neighbors
Good coexistence
Put coexistence in PAR scope
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W-SUN Technical Requirements Discussion

7. W-SUN Technical Requirements Discussion
Ubiquity and Density
Maximum allowable power setting will be required in sparse deployments
Power variation is advantageous when network density will support it
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W-SUN Technical Requirements Discussion

8. Ubiquity and Density Cont’
High-power devices have large interference ranges
Power variation
Narrow bandwidth
Due to large number of nodes and hidden terminals, multiple collision domains may be required
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W-SUN Technical Requirements Discussion

9. W-SUN Technical Requirements Discussion
Cost Constrained
Simple modulation techniques
Unlicensed band
Must comply with existing regulations - bandwidth use and power level is restricted
Range requirements practically limits choice to frequency hopping or DSSS
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W-SUN Technical Requirements Discussion

10. W-SUN Technical Requirements Discussion
Low Data Rate & Latency
Latency ranges from 15s meter reads to 2s SCADA operations
Low data rate allows the use of simple modulation schemes and narrow bandwidth
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W-SUN Technical Requirements Discussion

11. Large Packets/IP Support
Internet Protocols (IP) are used across most interfaces and use larger Maximum Transmission Unit (MTU) size:
Ethernet IEEE = 1492
Ethernet v2 (RFC 1191) = 1500
RFC 879 >= 576
RFC 2516 (PPoE/DSL) = 1492
Larger packets require more robust error detection
The greater the link budget, the more robust the link
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W-SUN Technical Requirements Discussion

12. W-SUN Technical Requirements Discussion
Ease of Commissioning
Ease of commissioning and fixed installation points means that directional antennae or modulation techniques that rely on position may have only limited use for W-SUN
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W-SUN Technical Requirements Discussion

13. W-SUN Technical Requirements Discussion
Summary
Cost and low-data rate requirements allow the use of simple modulation techniques
Simple modulation schemes with narrow bandwidth increases link budget and leads to more robust links for large packets
Range and density requirements mean that maximum allowable power must be used
Cost requirements make unlicensed bands attractive
Unlicensed bands impose stricter coexistence requirements
High power, density and narrow bandwidth point to frequency hopping as a good interference avoidance technique
11/8/2018
W-SUN Technical Requirements Discussion