1. doc.: IEEE 802.15-08-0244-00-wng0 12-May-2008 FlammerSubmission: MAC Requirements for Smart Grid Slide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Fitting Smart Grid Applications and 802 Wireless Ecosystem] Date Submitted: [12 May, 2008] Source: [Benjamin A. Rolfe] Company [Independent Consultant] [Jay Ramasastry] Company [Silver Springs Networks] [George Flammer]Company [Silver Springs Networks] Address [] Voice:[+1.408.395.7207] E-Mail:[ben@blindcreek.com, jramasas@silverspringnet.com, gflammer@silverspringnet.com] Re: [] Abstract:Review of what leads SSN to 802.15.4 Purpose:Contribution to Neighborhood Area Networks Interest Group (IG-NAN) 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.

2. doc.: IEEE 802. 15-08-0244-00-wng0 Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 2 Benjamin Rolfe Independent Consultant Jay Ramasastry George Flammer Silver Springs Networks Smart Grid and the 802 Wireless Ecosystem May 12, 2008 IEEE 802.15 Interest Group: Neighborhood Area Networks 05-May-2008doc.: IEEE 802. 15-08-0244-00-wng0 Prepared By:

3. doc.: IEEE 802. 15-08-0244-00-wng0 Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 3 Why 802.15 For Neighborhood Area Networks? 05-May-2008doc.: IEEE 802. 15-08-0244-00-wng0

4. Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 4 »General Requirements Summary »802 Wireless Ecosystem »Reviewed:  3G/4G  802.16  802.11  802.20  802.22  802.15 Outline Prefer : 802.15

5. doc.: IEEE 802. 15-08-0244-00-wng0 Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 5 Utility Network – General Requirements Wide Area Process Control »Low Data Volume  5-10 transactions per day per device  Low data rate, low duty cycle »Latency tolerance  Needs to be consistent/deterministic »Ubiquity  Every customer connected  Multiple devices per customer »Robustness  Perform under extreme environments  Tolerant of device placement rather than optimally placed for network  Consistency of performance »Cost Constrained  Acquisition – infrastructure cost  Deployment  Consistency across regions  Long term Cost of Ownership »Scalable  Millions per utility  Billions per country »Needed Right Now!

6. doc.: IEEE 802. 15-08-0244-00-wng0 Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 6 Utility Networks Architecture Reference: 15-08-0199-00-wng0

7. doc.: IEEE 802. 15-08-0244-00-wng0 Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 7 Architectural Considerations »Mesh  Self forming and maintaining  Self-healing (pre-healing)  Multi-hop with large spans  Large number of end nodes »Peer to peer »Flexible topologies »Overlapping SOIs and SOPs »Heterogeneous network elements

8. doc.: IEEE 802. 15-08-0244-00-wng0 Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 8 802 Wireless Ecosystem

9. doc.: IEEE 802. 15-08-0244-00-wng0 Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 9 Standards Review

10. doc.: IEEE 802. 15-08-0244-00-wng0 Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 10 3G/4G »Licensed spectrum (cost, flexibility, risk) »Coverage »Dependence on service providers (and infrastructure)  Limited options per region  Inconsistent region to region – difficult to provide common solution everywhere  Inconsistent over time »Legacy requirements (voice, text, etc.) add complexity »Optimized for mass consumer network  Access not guaranteed »Reliability/Robustness can not be controlled »Part of the solution for backhaul

11. doc.: IEEE 802. 15-08-0244-00-wng0 Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 11 802.16 / WiMAX »Licensed spectrum »Architectural Complexity  Infrastructure based architecture »Designed for high data rate »Unlicensed WiMAX ?  No WiMAX profile (yet?) »Mobile  Licensed spectrum only (so far?) »Complimentary part of the solution  Backhaul

12. doc.: IEEE 802. 15-08-0244-00-wng0 Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 12 802.11 / WiFi »Optimized for high data rate and high duty cycle »Complex to Mesh »Crowded space  Provisioning complexity »Perceived security/privacy concerns  Perceived as an open network (hotspot)  Robustness concerns »Metro WiFi  Inconsistent coverage => inconsistent solution »Complimentary part of the solution  Backhaul

13. doc.: IEEE 802. 15-08-0244-00-wng0 Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 13 802.20 »Focus on Mobile Applications »Licensed spectrum (above 2Ghz)  Same concerns as above »Complex multiple radio system  Cost and availability »Infrastructure intensive  Deployment cost and complexity »Lack of deployed base/inertia  High risk  Unclear risk/reward

14. doc.: IEEE 802. 15-08-0244-00-wng0 Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 14 802.22 »Applicability unclear »Infrastructure based architecture  Point-to-point and point-to-multipoint »Lack of deployed base/inertia  Cost and availability uncertainty »Something to watch  Sub GHz, unlicensed ban

15. doc.: IEEE 802. 15-08-0244-00-wng0 Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 15 802.15 »15.1  Simple and Cheap, but…  Short range, low rate  optimized for low power  not ideally “meshable” »15.3c  Way more speed than needed  Very short range (60GHz)  Optimized for totally different application needs

16. doc.: IEEE 802. 15-08-0244-00-wng0 Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 16 802.15 »15.4  Unlicensed spectrum (incl. 900 MHz)  Low complexity  Suitable for Mesh (but can be made better)  Compatible data rates  Best fit of 802 standards …need appropriate enhancements  Application Symbionics Synergy with existing applications Same users implementing in both application spaces

17. doc.: IEEE 802. 15-08-0244-00-wng0 Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 17 802.15 15.1 is too slow… 15.3 is too fast… 15.4 is just right!

18. doc.: IEEE 802. 15-08-0244-00-wng0 Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 18 802.15 15.1 is too slow… 15.3 is too fast… 15.4 is just right! (well, closer…)

19. doc.: IEEE 802. 15-08-0244-00-wng0 Submission: 802.15 NAN 12-May-2008 Rolfe/Flammer/RamasastrySlide 19 Take Aways »15.4 closest to “home” »MAC may be closer than PHY ??  (work on this)