QLowpan:asensornetworkqueriesprocessorover6lowpan

basednetworksPresented by :

Karim Fathallah, ENIT/TUNIS EL MANAR UNIVERSITY

PLAN Introduction An Overview Of SNQP 6lowpan based networks QLOWPAN Conclusion

Introduction

DEFINITION WSN (Wireless,

Sensors Network) A network of tiny

embedded systems: A micro-controller An antenna A power source sensors

Standard programming scenario

Typical approach to develop embedded WSN software:

Write a program using high level language like nesC

Compiling and flashing the code on every node

Wsn programming challenges

Standard approach is challenging because of:

Limited memory capacity

Limited energy source

Limited computational resources

Typical Approach limitations

They also present additional limitations including:

Changing the application logic implies rewriting the sensor

embedded code

Developing a WSN application requires expert knowledge

AnOverviewOfSNQP

DEFINITION OF AN SNQP

Fundamental principle of Sensor Network Query Processor (SNQP) is to model the WSN as a distributed database for queries similar to SQL.

A SNQP is also a user-friendly interface for building and addressing queries to retrieve WSN data streams.

SNQP Architecture The server side software: running on

the user PC (base station). In its most basic form, the software interprets queries, delivers them in the network, and collects the results posted on the network.

Node-side: The software behaves like a distributed query processing. This software consists of several modules built on top of the nodes operating system.

SNQP STORY

SNQP Date & university

Cougar Cornell University (2000)

TinyDB Berkley University (2003)

SwissQM ETH Zurich (2007)

The Sensor NEtwork Engine (SNEE)

Manchester University (2009)

TikiriDB University of Colombo School of Computing (2010)

Corona University of Sydney (2011)

6LowpanWSN

6Lowpan WSN Overview

6LOWPAN COMPRESSION

RPL PROTOCOL

RPL Objective function

QLowpan

Qlowpan: Architecture

THE PARSER Lex/yacc sql parsing program

Parser creates a query packet following this structure:

Message header (queries/result, length) A select header (number of field, epoch, lifetime) List of fields List of expression

Message header Select header Fields list Expression list

SELECT temp,humid,node FROM sensors WHERE nodeid < 10 SAMPLE PERIOD 1 FOR 10;

MULTICAST FORWARDER Each multicast datagram must carry a multicast option

header (HBHO) Each node maintain a cache of recently seen multicast

packet Each packet is uniquely identified by the HBHO header Neighboring nodes exchange informations about their

cache contents through specific icmpv6 datagram If the receiving node's cache don't match with the neighbor

cache information it resets the trickle timer

Validation

VALIDATION

PERFORMANCE RESULTS 1

PERFORMANCE RESULTS 2

PERFORMANCE RESULTS 3

PERFORMANCE RESULTS 4

CONCLUSION Our contribution focuses on sensor networks

queries processor systems The SNQP approach is very promising, given its

extensibility and its advantages for sensor networks application developers

We point out several open and potential research issues including scalability.

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