IEEE 802.15.4- Supframe. 演講者：李嘉凱 指導教授：柯開維. Outline. 無線感測 網路 IEEE 802.15.4 Superframe CSMA/CA Reference. 無線感測 網路. 無線感測網路（ Wireless sensor network ）是由許多在空間中分布的自動裝置組成的一種無線通訊計算機網路， 這些裝置 使用感測器協作地監控不同位置的物理或環境狀況（比如溫度、聲音、振動、壓力、運動或污染物） 。 無線感測網路主要包括三個方面： 感應、通訊、計算 （ 硬體、軟體 、 演算法 ） 。 - PowerPoint PPT Presentation
PowerPoint
IEEE 802.15.4-SupframeOutlineIEEE
802.15.4SuperframeCSMA/CAReference
Wireless sensor network
,Sensor WebSWIEEE 802.15.4IEEE 802.15WPAN(Low Rate-Wireless
Personal Area Network, LR-WPAN)(IEEE, Institute of Electrical and
Electronics Engineers) 2003 ZigBee
IEEE802.15.4(1)(2)(3)
IEEE 802.15.4IEEE 802.15.4 LR-WPAN 250kb/s40kb/s20kb/s16-bit
(short address) 64-bit (extended addressguarantee time slotGTS
CSMA/CA CRC-16 2450MHz 16 915MHz 10 868MHz 1 IEEE 802.15.4
peer-to-peer mesh networkIEEE 802.15.4IEEE 802.15.4(Full
Function Device, FFD)(PAN coordinator)(Reduced Function Device,
RFD)(PAN coordinator) (FFD)
IEEE 802.15.4
IEEE 802.15.4
IEEE 802.15.4IEEE 802.15.4Beacon FramecoordinotardeviceData
FrameAcknowledgment FrameAcknowledgment Frame IEEE 802.15.4 MAC
Command FrameMAC Command FrameIEEE 802.15.4IEEE 802.15.4Beacon
FramecoordinotardeviceData FrameAcknowledgment FrameAcknowledgment
Frame IEEE 802.15.4 MAC Command FrameMAC Command Frame
Superframe Superframe IEEE 802.15.4 Beaconnon-Beacon
modeSuperframeSuperframe(Inactive portion) : (Active portion) : 16
[0~15](slot)16 (Contention access period)(Contention free
period)()(guarantee time slots, GTS)
Superframe Superframe (Beacon)
CSMA/CA algorithmIEEE 802.15.4CSMA/CA Beacon(Superframe)slotted
CSMA/CAslotted CSMA-CA Backoff Period (BP) = aUnitBackoffPeriod =
80 bits (0.32 ms)unslotted CSMA/CA
ReferenceIEEE 802 Working Group, IEEE 802 Working Group,
Standard for Part 15.4:Wireless Medium Access Control (MAC)and
Physical Layer (PHY) Specifications for Low Rate Wireless Personal
Area Networks(LR-WPANs), ANSI/IEEE 802.15.4, April. 2012.
