IEEE Draft Standard Presented by Arsalan Tavakoli CS October 18, 2005

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

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

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

High-Level Characteristics

Network Layer Guidelines 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

Topology Formations

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

System Layering

MAC Frame Format

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

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

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

Physical Layer Packet Structure

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

Telos Platform

MicaZ Platform