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Doc.: IEEE 15-08-0323-00-004e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 1 Project: IEEE P802.15 Working Group for Wireless Personal.

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Presentation on theme: "Doc.: IEEE 15-08-0323-00-004e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 1 Project: IEEE P802.15 Working Group for Wireless Personal."— Presentation transcript:

1 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 1 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Application Requirements for a Low-power, Responsive, Adaptive, IP-friendly 15.4 MAC Date Submitted: 13 May, 2008 Source: Wei Hong, Company: Arch Rock Corporation Address: nd Street, Suite 410, San Francisco, CA 94707, USA Voice: , FAX: , Re: Application Requirements for e Abstract:Application Requirements for a Low-power, Responsive, Adaptive, IP-friendly 15.4 MAC Purpose:Outline requirements for a Low-power, Responsive, Adaptive, IP-friendly 15.4 MAC 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

2 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 2 Application Requirements for a Low-power, Responsive, Adaptive, IP-friendly 15.4 MAC Wei Hong VP of Engineering Arch Rock Corp.

3 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 3 Outline The Case for IP-centric Sensor Networks –15.4 as a new IP link Low-power vs. Responsiveness The need for Adaptiveness A framework towards a solution Requirements taken for granted –Enabling low-power mesh networking Low-power routers and edge nodes –Reliability –Security

4 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 4 The IP-centric Vision

5 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 5 Many Advantages of IP Extensive interoperability –Other wireless embedded network devices –Devices on any other IP network link (WiFi, Ethernet, GPRS, Serial lines, …) Established security –Authentication, access control, and firewall mechanisms –Network design and policy determines access, not the technology Established naming, addressing, translation, lookup, discovery Established proxy architectures for higher-level services –NAT, load balancing, caching, mobility Established application level data model and services –HTTP/HTML/XML/SOAP/REST, Application profiles Established network management tools –Ping, Traceroute, SNMP, … OpenView, NetManager, Ganglia, … Transport protocols –End-to-end reliability in addition to link reliability Most industrial (wired and wireless) standards support an IP option

6 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 6 Users View of IP IPv4 and IPv6 builtin to Windows, Mac OS and Linux The ubiquitous web browser Socket API for TCP and UDP SOAP or REST-based API Wireshark and Ethereal IPSec, VPN, Firewalls

7 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 7 Myth: IP Stack Is Too Large? ROMRAM CC2420 Driver Encryption Media Access Control3309 Media Management Control LoWPAN + IPv Checksums1340 SLAAC21632 DHCPv6 Client2123 DHCPv6 Proxy1042 ICMPv65220 Unicast Forwarder Multicast Forwarder3524 Message Buffers02048 Router UDP4506 TCP (including runtime) Low-power with modified 15.4 MAC 24KBROM 3.5KBRAM

8 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 8 Market Demand for IP Over as a cheaper IP link: replacing existing expensive, power-hungry GPRS, WiFi, Bluetooth links

9 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 9 Market Demand for IP Over 15.4 (cont) Where IT departments rule, e.g., data centers –Familiar access and management paradigm for IT staff Future proofing investment –Utility HAN Will 15.4 be the only link for HAN for the next 20 years?

10 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 10 Properties of an IP-friendly Link Always On (illusion) –Talk to a neighbor any time Low Latency –Low transmission delay neighbor-to-neighbor Multicast Capable –Broadcast to all neighbors Synchronous Acks –Reliable datagram delivery to a neighbor

11 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 11 Requirement for Being Low-power AND Responsive Fundamentally sensor networks must be able to respond to unexpected events –How to maintain low-power while waiting for a rare event Application examples –Mobile applications 1 st Responder Monitoring Smart package tracking –Perimeter Security 2-second max latency for intrusion detection 5-10 year battery lifetime

12 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 12 The Need for Adaptiveness Example: Train axle condition monitor –Dynamic environment Cars shuffle Surroundings change en route –Unpredictable workload Temperature threshold increases vibration sampling

13 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 13 A Possible Solution Optimizations Power – Channel Utilization – Average Latency – Throughput Optimizations Streaming Scheduling Repairing 15.4 Acks False Positives – Security – Payload Repairing 15.4 Acks False Positives – Security – Payload 15.4 HDR PANPANDSTDSTSRCSRCSECSECTimingTimingPayloadPayload 15.4 FTR Sampled Listening Stateless – Low Latency – Always On Abstraction – Robust Sampled Listening Stateless – Low Latency – Always On Abstraction – Robust

14 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 14 NetNet A Possible Solution (cont) PhyPhy LinkLink Media Management Control Remote Media Link Stats Neighbor Table AddrPeriodPhasePendingRSSIPRR Local Media Sample Period Sample Phase DataDataAckAck AbstractionAbstraction Provide the mechanisms Upper layers define the policy

15 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 15 Evaluation: Link Layer Primitive Profiles Channel Sample OverhearReceive (26 bytes) Receive (127 bytes) Transmit (26 bytes) Transmit (127 bytes) Preamble + Transmit (64 ms) Preamble + Transmit (128 ms)

16 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 16 Evaluation: Link Power Model

17 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 17 Discussions Channel Sample Period: knob for trading off responsiveness for low power consumption Tradeoff between send and receive cost Maintain low-power state when fallen out of network Scheduling can be layered on top of Sampled Listening for further power reduction Channel hopping can be incorporated

18 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 18 Summary Requirements for 15.4 –IP-friendly: always-on illusion –Responsive and low-power: passive vigilance –Adaptive to dynamically changing environment and workload –And of course Enabling low-power meshing Reliable Secure A solution exists

19 doc.: IEEE e Submission 13 May, 2008 Wei Hong, Arch Rock CorporationSlide 19 Thanks You Questions?


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