Language is the most important communication tool for human beings and the main expression for people to communicate. In the age of the Internet of Things, when machines need to communicate, they also need to be in a language that they can understand each other. Today, we will take a look at the wireless short-range communication languages ​​and technologies that are commonly used in the Internet of Things--Huawei Hilink protocol, WiFi (IEEE 802.11 protocol), Mesh, Bluetooth, ZigBee, Thread, Z-Wave, NFC, UWB, LiFi.
1. Huawei Hilink Agreement
In December last year, Huawei launched a self-developed "three-piece" smart home "Hilink", Huawei-LiteOS system and IOT chip. At present, various Internet end-user interconnection agreements on the market have been arbitrarily contested, but they seem to be unfriendly and isolated from each other, and each is behind closed doors. The Hilink protocol is known as the "mandarin" between smart devices. It automatically discovers devices and connects them with one click, and is compatible with protocols such as ZigBee, WiFi and Bluetooth.
2.WiFi/IEEE 802.11 protocol
WiFi, full name Wireless-Fidelity, wireless fidelity, is a standard in wireless local area networks (WLAN). Since its launch in 1999, it has been one of the more popular ways to access the Internet in our lives. Usually WiFi technology uses 2.4GHz and 5GHz surrounding frequency bands, and a wired router can connect a wired router to a WiFi signal. The WiFi standard family also has 802.11a, 802.11b, 802.11g, and 802.11n.
In 2016, the WiFi Alliance's latest 802.11ah WiFi standard, WiFi HaLow, enables WiFi to be used in more places such as small-size, battery-powered wearable devices that are also suitable for deployment in industrial facilities, and between Between applications. HaLow uses the 900MHz band, which is lower than the 2.4GHz and 5GHz bands of current WiFi. Lower power consumption, while HaLow's coverage can reach 1 km, the signal is stronger, and it is not easy to be disturbed. These characteristics make WiFi more responsive to the development of the Internet of Things era.
Advantages: wide coverage and fast data transfer rate.
Disadvantages: poor transmission security, poor stability, slightly higher power consumption, and poor networking capabilities.
3.Mesh/IEEE 802.11s protocol
The wireless Mesh network, known as the cheap "Last Mile" broadband access solution, utilizes a multi-hop wireless mesh structure to provide broadband access to mobile users. Mesh is a combination of WLAN and mobile Ad Hoc (peer-to-peer) networks. Compared with the WLAN, each network terminal can communicate directly with each other, and no longer needs to be forwarded by the AP (base station), and the coverage is larger. Compared with Ad Hoc, due to the fixed and power-filled backbone router, there is no need to consider too much in terms of mobility and power consumption.
Advantages: The network deployment is fast, no complicated configuration is required; the network is stable, any node is broken, and the data transmission of other devices is not affected; the network coverage is large, and various broadband wireless access technologies (such as WLAN, WiMAX, UWB, 3G, etc.) can be used. Combined to form a larger multi-hop network structure.
Disadvantages: It has a certain delay, is not suitable for real-time monitoring applications, and has limited network capacity.
220Kv Steel Pole,Suspension Steel Pole,220Kv Galvanized Pol,Polygonal Transmission Steel Pole
Jiangsu Baojuhe Science and Technology Co.,Ltd. , https://www.galvanizedsteelpole.com