This page summarizes resources for ZigBee and IEEE 802.15.4. It is still under active update.
IEEE 802.15.4 defines the physical and MAC layers. ZigBee is based on IEEE 802.15.4 but also defines higher layer protocols.
IEEE 802.15.4 is also adopted by 6LoWPAN, WirelessHART, THREAD, etc.
- 868 MHz, Europe, channel $k$ = 0, $f_c = 868.3$ MHz
- 915 MHz, America, Australia, channel $k=$ 1 - 10, $f_c = 906 + 2(k-1)$ MHz
- 2.4 GHz, Worldwide, channel $k$ = 11 - 26, $f_c = 2405 + 5*(k-11)$ MHz, OQPSK
Figure from https://uk.mathworks.com/help/comm/ug/end-to-end-ieee-802-15-4-phy-simulation.html.
All OQPSK PHYs map every 4 PPDU bits to one symbol. The 2.4 GHz OQPSK PHY spreads each symbol to a 32-chip sequence, while the other OQPSK PHYs spread it to a 16-chip sequence. Then, the chip sequences are OQPSK modulated and passed to a half-sine pulse shaping filter (or a normal raised cosine filter, in the 780 MHz band).
Run the Matlab End-to-End IEEE 802.15.4 PHY Simulation to have a deep understanding on the modulation.
Please refer to Section 184.108.40.206 O-QPSK PHY of the Rohde & Schwarz Application Note for a detailed introduction.
- Direct Transmission
- Indirect Transmission (Polling)
- Data Frame
- Beacon Frame
- Acknowledgement Frame
- MAC Command Frame
Network Architecture and Topology
- Star Topology
- Tree Topology
- Mesh Topology
Check the first chapter of IEEE 802.15.4 Stack User Guide for a brief introduction of IEEE 802.15.4.