W-SUN Technical Requirements Discussion Project: IEEE P802.15 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[] E-Mail: [jvangrue@silverspringnet.com] Re: [] Abstract: Discussion of TG4g Technology Requirements Purpose: Contribution to Task Group 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. 11/8/2018 W-SUN Technical Requirements Discussion

Technology Requirements 11/8/2018 W-SUN Technical Requirements Discussion

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 11/8/2018 W-SUN Technical Requirements Discussion

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 11/8/2018 W-SUN Technical Requirements Discussion

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) 11/8/2018 W-SUN Technical Requirements Discussion

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 11/8/2018 W-SUN Technical Requirements Discussion

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 11/8/2018 W-SUN Technical Requirements Discussion

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 11/8/2018 W-SUN Technical Requirements Discussion

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 11/8/2018 W-SUN Technical Requirements Discussion

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 11/8/2018 W-SUN Technical Requirements Discussion

Large Packets/IP Support Internet Protocols (IP) are used across most interfaces and use larger Maximum Transmission Unit (MTU) size: Ethernet IEEE 802.3 = 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 11/8/2018 W-SUN Technical Requirements Discussion

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 11/8/2018 W-SUN Technical Requirements Discussion

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