Wireless e Ubiquitous Computing A cura di Eugenio Marogna e Michele Visciola.
EMP: A Network Management Protocol for IP-Based Wireless Sensor Networks 2010 International...
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Transcript of EMP: A Network Management Protocol for IP-Based Wireless Sensor Networks 2010 International...
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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