EMP: A Network Management Protocolfor IP-Based Wireless Sensor Networks

2010 International Conference onCommunication in Wireless Environments and Ubiquitous Systems: New Challenges (ICWUS)

Author : Shafique Ahmad Chaudhry, George Boyle, Weiping Song, Cormac Sreenan

Speaker : Ya-Ling, Wang Date : 2012/5/8

Outline

• Introduction• Related Work• System Model and Architecture• EmNetS Management Protocol(EMP)• SNMP Compliance and Lightweight MIB• Implementation• Preliminary Results• Conclusion

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Introduction

• Network management system– Standard network management<->WSN applications

• The management of IP-WSN is different from just WSNs as well as just from IP networks. – IP-based WSN

• IP-like solutions but lighter weight• Variety of services making it further complicated

• EmNetS Network Management Protocol– SNMP-compliant IP-based WSN and Lightweight MIB

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Related Work

• Simple Network Management Protocol– It can’t be deployed directly on the sensor

networks • SNMP message overhead• The problem of node-failure • Requires huge Management Information Base (MIB)

• Sensor Network Management System– Provides query based network health data

collection and event logging• High memory usage

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System Model and Architecture

• The 6LoWPAN entities• Network Discovery– The device discovery is performed by the

coordinators– Hierarchy Transmit– Only changes will Update• ↓communication overhead • ↑Network lifetime

– Network-wide snapshot

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CCEE

EE

EE

GatewayGateway

CCC: CoordinatorE: End Device

EmNetS Management Protocol(EMP)

• Network wide snapshot– Manage the resources

• Get the network state from nodes– Active probing, Periodic reports

• The accuracy of the state data– Reporting interval, Network latency

• Cache of network state : EmpObjExpiry time– empObjExpiryTable– empObjUpdateTable

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Now 14:30 14:30Expiry Time 5 min 5 minLast Update 14:15 14:28What to do Get new Get from Cache

SNMP Compliance and Lightweight MIB

• Monitor devices within the WSNs– It is impractical to transport SNMP over WSNs• Inherent bandwidth limitations

• Management Information Base– SNMP MIB is huge– Designed a light-weight and simpler MIB for WSN• Network : general and constant information• Application : provides statistics• Mote groups : deals with information specific to WSN

nodes2012/5/8

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※OID: Object IDentifier

Implementation

• The management station – Runs on the gateway node• Communication between IP and WSN networks• Net-SNMP agent

– The EMP framework written in Java

• The agent component– Tmote Sky sensor nodes with MSP430

microcontroller– 10KB RAM and 48KB flash memory

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Query - Response Delay

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Management Traffic Overhead

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Query - Response Success

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Conclusion

• This paper present– EMP, SNMP interoperable network

management framework for IP-WSNs– Reduction of communication cost – Implemented on real test

• Future work– Optimization of network life – Aggregation mechanics of EMP traffic – Inference mechanisms

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