ZigBee学习

1. Abbreviation

   SHR: Synchronization Header

   SFD: start-of-frame delimiter

   PHR: PHY header

   PSDU: PHY service data unit

   PPDU: PHY protocol data unit

   MPDU: MAC protocol data unit

   LQI: Link Quality Indication

 

2. ZigBee PHY-Layer frame structure

   Preamble Sequence: 4 octets, All are zero

   SFD: 1 octet, predefined value, 0xA7

   PHR: 1 octet, frame length, 7 LSB is used for frame length, MSB reserved as 0 for IEEE802.15.4 compliant frames.

   PHY Payload: max 127 octets, the last two octets are used for Frame check sequence (FCS).

 

2.1 PHR

    0~4: reserved

    5: MPDU (Acknoledgement)

    6~8: Reserved

    9~max: MPDU 

 

3. 频率列表

频率	带宽	信道	调制方式	速率
868 MHz	0.6 MHz	1	BPSK	20 Kbps
915 MHz	2 MHz	10 (1~10)	BPSK	40 Kbps
2.4 GHz	5 MHz	16 (11~26)	OQPSK	250 Kbps

4. 802.15.4的网络所有节点都工作在同一信道上。