Challenges of Resource-Constrained Networked Embedded Systems

Transcription

1 Manish Lad UCL Department of Computer Science University College London Challenges of Resource-Constrained Networked Embedded Systems Wireless Sensing Interest Group Meeting National Physical Laboratory, Teddington, UK 27th September 2006

2 Emergency in a road tunnel

3 Challenges facing emergency services Location Accurately pin-point the exact location of the scene Information Environmental conditions within the tunnel Communication Between the rescue teams both inside and outside the tunnel Difficult in the enclosed environment of the tunnel

4 RUNES Reconfigurable Ubiquitous Networked Embedded Systems To provide a standardised architecture that enables the creation of large-scale, widely-distributed, heterogeneous networked embedded systems that inter-operate and adapt to their environments

5 A network of embedded devices Tunnel wall Tmote Sky Sensor Device Sensor devices Multi-radio routing devices Tunnel opening Multi-radio routing gateways Vehicles connectblue multi-radio gateway Sensor devices Multi-radio routing devices Emergency Services Sensor devices PDAs Multi-radio routing devices Lippert multiradio gateway

6 The limitations of embedded systems Resources Power Processing Storage Inter-communication Heterogeneity Transience Reconfigurability Mobility Loss/Damage

7 A lightweight solution Platforms Contiki Operating System - using lightweight stackless threads FreeRTOS - open source, mini Real Time Kernel DENX Embedded Linux Development Kit (ELDK) Communication protocol stack µip, µaodv Compatible with existing protocol stacks Middleware kernel Component model and associated API Predictability and Control Control loops

8 Middleware architecture Environment Application/Middleware Components Platform-specific Kernel Implementation Middleware Kernel API Platform-specific Kernel Implementation Platform-specific Kernel Implementation Component-based Middleware Contiki FreeRTOS Linux Sensor device Gateway device Gateway device Hardware and RF

9 The RUNES middleware Component Model Design Defines components as basic run-time units Enables components to be instantiated at run-time Functionality provided by components through interfaces Dependancies expressed through receptacles Receptacle/Interface binding made with connector components Component Run-time Kernel Implementations Java C/Unix C/Contiki

10 Middleware components Data acquisition Measurement component Obtain environmental readings on sensor devices Data dissemination Notification component Disseminate sensor readings to control centre Publish-Subscribe infrastructure Component to disseminate sensor readings through broadcast Mechanism to enable broadcast sensor readings to be shared

11 Application of the middleware

12 Pin-pointing location µip and µaodv Overcome transience, damage and loss Routing reconfiguration Re-route data around broken sensor devices

13 Extracting information Environmental conditions Temperature Humidity Visibility Data dissemination Reporting conditions to control centre

14 Communicating to co-ordinate rescue efforts Publish relevant data to emergency services Share and propagate data among firefighters

15 Small-scale demonstration June 2006

16 Upcoming demonstrations Mobile Ad-hoc and Sensor Systems (MASS 2006) IEEE International Conference Vancouver, Canada 9 12 October 2006 IST Event 2006 European Information Society Technologies Conference Helsinki, Finland November 2006

17 IST 2006 RUNES Video Tunnel view Tunnel environment map Key event Printed RUNES scene Tunnel controller view Tunnel sensor network Fire fighter view Tunnel model Emergency command view

18 Summary A component-based middleware architecture Addresses fundamental challenges through Lightweight platform and protocol implementations Dynamically reconfigurable middleware architecture Incorporates capabilities to Cope with the failure of devices and communication links Reconfigure automatically to deal with a changing environment Discover available resources and communication paths

19 References Conference publications: Geoff Coulson, Manish Lad, Richard Gold, Cecilia Mascolo, Luca Mottola, Gian Pietro Picco, Stefanos Zachariadis. Dynamic Reconfiguration in the RUNES Middleware. Proc. of the Third International Conference on Mobile Ad-Hoc and Sensor Systems (MASS 2006). IEEE Press, Vancouver, Canada. October Paolo Costa, Geoff Coulson, Cecilia Mascolo, Gian Pietro Picco and Stefanos Zachariadis. The RUNES Middleware: A Reconfigurable Component-based Approach to Networked Embedded Systems. Proc. of the 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications (PIMRC'05). Berlin, Germany, Sept Submitted for publication: Paolo Costa, Geoff Coulson, Richard Gold, Manish Lad, Cecilia Mascolo, Luca Mottola, Gian Pietro Picco, Thirunavukkarasu Sivaharan, Nirmal Weerasinghe, and Stefanos Zachariadis. The RUNES Middleware for Networked Embedded Systems and its Application in a Disaster Management Scenario.

20 Acknowledgements Reconfigurable Ubiquitous Networked Embedded Systems (RUNES), Supported by the Information Society Technologies (IST) Framework Programme 6 (FP6). The work described in this presentation is the result of the efforts of the large and enthusiastic RUNES project team Road Tunnel Emergency images supplied by FreeFoto.com and BBC news Embedded device images from moteiv connectblue and Lippert Application of the middleware architecture diagram by Luca Mottola, Dipartimento di Elettronica ed Informazione, Politecnico di Milano, Italy

21 RUNES Partners Industrial Academic Non-profit research institutes