1. IEEE 802.15.4 Draft Standard Presented by Arsalan Tavakoli CS 294 -11 October 18, 2005

2. Introduction Home Networking Application Classes Internet connectivity Multi-PC Connectivity Audio/Video Networking Home Automation Energy Conservation Security

3. Motivation Personal Area Network Requirements Low Power Consumption Minimal Installation Cost Low Overall Cost Existing Technologies Wired 802.11 Bluetooth

4. History of Development Combination of Two Standards Groups ZigBee Alliance IEEE 802 Working Group 15 Task Group 4 formed in December 2000 Low-rate Wireless Personal Area Network Focus only on Physical and MAC layer specifications

5. High-Level Characteristics

6. Network Layer Guidelines 802.15.4 Specification does not address Network Layer Expected to be self-organizing and self- maintaining to minimize cost to user Two Network Topologies Supported: Star Topologies Peer-to-Peer Topologies

7. Topology Formations

8. Data Link Layer Two Parts Logical Link Control (LLC) Standard among many 802.x standards Communicates with MAC through SSCS Proprietary LLC’s can communicate directly MAC Sublayer Data Service - Common Part Sublayer Management Service – Management Entity

9. System Layering

10. MAC Frame Format

11. Superframe Beacons Time between beacons divided in 16 time slots Can be used to provide bandwidth guarantees Contention-free period and duration of superframe announced in beacon

12. Additional MAC Features Channel Access Mediums Slotted CSMA-CA Unslotted CSMA-CA Acknowledgements Security No security Access Control Lists Symmetric Key Security

13. Physical Layer Two Potential Physical Layers 868/915Mhz 2.4Ghz Direct Sequence Spread Spectrum Same Packet Structure 27 Frequency Channels Total Dynamic Channel Selection left to network layer

14. Physical Layer Packet Structure

15. Other Physical Layer Features Modulation 868/915 – Binary Phase Shift Keying 2.4 – Offset Quadrature Phase Shift Keying Sensitivity and Range 868/915  -92 dBm 2.4  -85 dBm 10-20m typical range

16. Telos Platform

17. MicaZ Platform