1. EMP: A Network Management Protocol for IP-Based Wireless Sensor Networks 2010 International Conference on Communication 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

2. Outline Introduction Related Work System Model and Architecture EmNetS Management Protocol(EMP) SNMP Compliance and Lightweight MIB Implementation Preliminary Results Conclusion 2012/5/8 2

3. 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 2012/5/8 3

4. 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 2012/5/8 4

5. 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 2012/5/8 5 C C E E E E E E Gateway C C C: Coordinator E: End Device

6. 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 2012/5/8 6 Now14:30 Expiry Time5 min Last Update14:1514:28 What to doGet newGet from Cache

7. 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 nodes 2012/5/8 7 ※ OID: Object IDentifier

8. 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 2012/5/8 8

9. Query - Response Delay 2012/5/8 9

10. Management Traffic Overhead 2012/5/8 10

11. Query - Response Success 2012/5/8 11

12. 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 2012/5/8 12