Everyone learned IOT first chapter study notes
1.1 Discussion of things with a cup of coffee
Things birth ------------ (Troy coffee pot) Cambridge monitored for a regular coffee maker.
Things development
2005 ---------- International Telecommunication Union cited the concept of things
in 2008 ---------- IBM Smarter Planet concept put forward
in 2009 -------- - "Experience China" put our things to a climax
in 2013 ---------- German "industry 4.0"
2015 ---------- "Made in China 2025" released
things division development period
1999 - 2013
the concept stage - involves only wireless radio frequency was
2014 - 2016
smart dressed, smart home
2016 - present
intelligent wear points, intelligent home mature floor, things eco-system construction to lay a good foundation.
Cloud - Tube - logical system end
application layer ---------- responsible for data presentation and customer interaction
platform ---------- layer is responsible for device communication management, data storage, business planning and other
network layer ---------- responsible for terminal access and data transmission
aware layer ---------- responsible for information collection and processing signals
with vertical applications partitioning
utility things, vehicle network, industrial things , smart home things
1.2 reliable wired communication
Wired communication technologies:
Ethernet, PLC, RS-232, M -Bus, RS-485
Ethernet: The most common communication protocol standards used by existing LAN.
Including standard Ethernet, Fast Ethernet, 10G Ethernet.
RS-232: EIA standard interface specified asynchronous transmission.
Comprising a DB-9, DB-25-pin shape, having interfaces COM1 and COM2.
RS-482: To solve the RS-232 interface may be implemented to achieve point to point communication networking functions can not be developed.
Difference between the two:
M-Bus-Meter Bus- household meter buses: bus standard for non-European household meter power transmission.
PLC: Power Line Communication technology
long-distance transmission, home security and other aspects of a wide range of use.
Advantages and disadvantages of wired communication technology
advantages: high stability, high reliability
disadvantages: limited to the transmission medium
1.3 contending wireless communication
A cellular mobile communication ---------- 2G, 3G, 4G communication technology
---------- short range wireless communication technology Bluetooth, WIFI, ZigBee, Z-Wave
Bluetooth: 1Mbps maximum transmission distance of a large capacity, short-range, wireless digital communications technology standard the maximum transfer rate of 10 cm to 10 meters block data transmission rate, low power consumption low, high security, network node, is not suitable for multi-point surveillance.
WIFI: a method that allows the electronic device to connect to a wireless LAN (WLAN) techniques, often used widely 2.4G UHF or 5G SHF ISM band RF coverage, data transmission rate block transmission poor security, poor stability, power consumption slightly .
ZigBee: IEEE802.15.4 standard is based on low-power local area network protocols widely used in industrial, household close] FIELD low complexity, self-organization, low power, low data rate after the object blocking signal is attenuated more different chips compatibility poor, network more flexible, easy to maintain
Z-Wave: a new RF-based, low-cost, low-power, highly reliable short-distance wireless communication technology used for residential, commercial lighting control, status read application (meter, lamp) simple network structure, low-power, low-cost low rates, no open standard, the chip can only be acquired by Sigma Designs which the only source
1.4LPWA technology
LPWA (Low Power Wide Area) low-power wide-area network
includes: sigfox, LoRa, NB-IOT
sigfox: UNB (UNB) technology to transmit power levels are very low, and can maintain a stable transmission rate of 100bps data connection network topology remains simple and easy to deploy based on the use of surface infrastructure star units authorized ISM Sub-G of radio frequency band
LoRa: Low Power WAN based open standard protocol of the MAC layer, based on the band while it is easier to Sub-GHz low power long distance telecommunications radio transmission scheme based on spread spectrum technology,
NB-IOT: Construction of a cellular network narrowband things may be directly deployed with the GSM network, UMTS network, LTE network
