Summary of characteristics of five wireless transmission protocols of Internet of things

Various types of wireless communication technology support equipment without cable connection , Realize data communication between devices or between devices and serial port server , Are carried out under various agreement conditions . At present, there are many different types of wireless communication technologies in the Internet of things （IoT） And device to device （M2M） It is widely used in hardware products in the field of communication .IEEE There are seven 802.15 Technical task force （ standard ）. these  802.15 The task group includes ：WPAN/ bluetooth 、Coexistence（ Network co-existence ）、 High speed rate WPAN、 Low speed rate WPAN、mesh The Internet 、 LAN and visible light communication . Each of these wireless transmission protocols has its own advantages and limitations .

LoRa Wireless transmission protocol

LoRa yes Long Range( Remote ) Abbreviation , It belongs to a kind of wireless communication technology , The transmission rate is relatively low ,LoRa Modular wireless technology has long-distance advantages 、 low power consumption 、 Low cost 、 Multi node features .

LoRaWAN Agreement is LoRa On the basis of physical layer transmission 、 A set of transmission protocol standards based on data link layer , Corresponding OSI In the seven layer model MAC layer ,LoRaWAN Eliminates hardware specific incompatibilities , It also has multi-channel access 、 Frequency switching 、 Adaptive rate 、 Channel management 、 Timing transceiver , Node access authentication and data encryption 、 Roaming and other features .

NB-IOT Narrowband transmission protocol

Nbiot Narrowband transmission protocol is based on the cellular narrowband Internet of things （Narrow Band Internet of Things, NB-IoT） Technology has become an important branch of the Internet of things .NB-IoT Based on cellular network , It only costs about 180KHz The bandwidth of the , It can be deployed directly in GSM、UMTS as well as LTE The Internet , To reduce the deployment cost to achieve smooth upgrade .
 

IEEE 802.15.4：ZigBee agreement

ZigBee Technology is an open global standard wireless transmission protocol , It's for  M2M Designed for the Internet . The technology has low cost 、 Low power consumption at the same time , It also has the characteristics of low delay and low duty cycle , It allows the product to maximize the service life of its power supply battery , It is an ideal technical solution for many industrial technologies . Besides ,ZigBee The module protocol provides 128 position AES encryption , It supports Mesh Ad hoc network , And it allows network nodes to connect together through multiple paths of wireless transmission .

ZigBee The most commonly used IOT application scenario of the module is smart home in the field of wireless transmission . This technology can connect multiple devices together at the same time , Make it an ideal choice for home network environment , Users can realize intelligent lock 、 The light 、 Communication between robots and devices such as thermostats , The controller can also be used for real-time control .

IEEE 802.11：WiFi Module communication protocol

WiFi The module uses radio waves （RF） To realize the mutual communication between two devices . This technology is often used to make computers 、 Devices such as tablets and mobile phones are connected to routers to achieve the purpose of surfing the Internet . actually , It can also be widely used for connection between any two hardware devices .

IEEE 802.15.1： bluetooth modular and BLE Transfer protocol

Bluetooth module and low power Bluetooth （BLE） Wireless transmission is a wireless technology used to transmit data over a short distance . Commonly used to connect users' mobile phones 、 Small smart devices such as tablets and laptops , For example, various voice systems , Low power Bluetooth module （BLE） Less power than the standard Bluetooth module , Often used for fitness bracelets 、 Smart watches or other wearable small hardware devices .