1. 6LoWPAN Extending IP to Low-Power WPAN 1 By: Shadi Janansefat CS441 Dr. Kemal Akkaya Fall 2011

2. A review on WSN Introducing 6LoWPAN 6LoWPAN Adaptation Layer 6LoWPAN Stacked Headers Routing in 6LoWPAN Conclusion 2 Contents:

3. What is a WSN? WSN: Wireless Sensor Network A network with wireless links formed in an ad-hoc manner The nodes are collaborative spatially distributed sensors Usually consists of a large number of nodes All nodes are used for a common task 3

4. Applications of WSNs Networking unattended sensor nodes have significant impact on the efficiency of many applications: ▫ Military applications such as combat field surveillance ▫ Civil applications such as security and disaster management 4

5. Characteristics of a Sensor Node Small device that can sense information around itself Capable of short range communication Constrained in energy supply and bandwidth 5

6. IEEE 802.15.4 A MAC layer protocol for WSNs Uses CSMA-CA channel access Low power consumption Supports star and peer-to-peer topology 6

7. 6LoWPAN: Extending IPv6 to Low Power WPANs 6LoWPAN defines how to extend IPv6 over low data rate, low power networks(LoWPAN) Why? ▫ Employing tools already developed rather than starting from scratch Challenges ▫ Large size of IPv6 datagram ▫ A responsive network layer is needed ▫ The need for supporting Multi-hop topology 7

8. IPv6 over IEEE 802.15.4 6LoWPAN introduces an adaptation layer between the IP stack’s link and network layers The adaptation layer enables efficient transmission of IPv6 datagrams over 802.15.4 8

9. 6LoWPAN Adaptation Layer Introducing the idea of stacked header: ▫ You only pay for what you use This layer provides : ▫ Header compression ▫ Fragmentation ▫ Support for layer-two forwarding 9

10. 6LoWPAN Stacked Headers All header formats are identified using dispatch header The mesh header is used to encode the hop limit The fragmentation header supports the fragmentation and reassembly of payloads 10

11. Utilizing Separate Headers 1)Point to Point Small Packet 2)Fragmented Large Packet 3)Mesh Transmitted Packet 11

12. Routing in 6LoWPAN Mesh Under Routing ▫ No IP routing ▫ Routing within the LoWPAN Route Over Routing ▫ Routing at the IP layer ▫ Utilizing network-layer capabilities defined by IP 12

13. Conclusion 6LoWPAN introduces a high quality IPv6 network stack on 802.15.4 6LoWPAN does not solve all of the problems and issues related to sensor networks Future research areas: ▫ Neighbor Discovery ▫ secure neighbor discovery ▫ service discovery 13

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