Language is the most important communication tool of human beings and the main expression of communication and communication among people. In the era of the Internet of things When the machines need to communicate, they also need to be in a language that they understand each other. Today, we'll come up with some of the more common wireless short-range communication languages ​​and technologies in the Internet of Things-Huawei Hilink, WiFi (IEEE 802.11), Mesh, Bluetooth, ZigBee, Thread, Z-Wave, UWB, LiFi. Huawei Hilink protocol Last December, Huawei unveiled its self-developed "three-piece" smart home-Hilink protocol, Huawei-LiteOS system and IOT chip. Currently on the market a variety of network end-user interoperability agreement is a hundred contention, but each other does not seem friendly, isolated from each other behind closed doors. The Hilink protocol, hailed as "mandarin," between smart devices, automatically discovers devices and connects at the touch of a button, along with protocols such as ZigBee, WiFi and Bluetooth. 802.11 protocol WiFi, full name Wireless-Fidelity, wireless fidelity, is a standard in wireless local area networks (WLANs). Launched in 1999, it has been one of the more common ways to access the Internet in our lives. Usually WiFi technology uses the frequency bands around 2.4GHz and 5GHz, and can connect a wired signal to a WiFi signal by connecting a wireless router through a wired network. The WiFi standard family also includes 802.11a, 802.11b, 802.11g and 802.11n. WiFi Alliance announced the 2016 WiFi WiFi-standard WiFiWiLow, WiFi can be applied to more places such as: small size, battery-powered wearable device is also suitable for deployment within industrial facilities, as well as between the two The application between. HaLow uses 900MHz band, lower than the current WiFi 2.4GHz and 5GHz band. Lower power consumption, while HaLow coverage can reach 1 km, the signal is stronger, and not easily be disturbed. These features make WiFi more responsive to the development of the Internet of Things. Advantages: wide coverage, data transfer speed. Disadvantages: transmission security is not good, poor stability, slightly higher power consumption, poor networking capabilities. 802.11s protocol The Wireless Mesh Network, known as the cheap "Last Mile" broadband access solution, leverages multi-hop wireless mesh 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 directly communicate with each other peer-to-peer, no longer needs to be forwarded by an AP (base station), and the coverage is larger. Compared with Ad Hoc, due to having a fixed and sufficient power of the backbone router, in terms of mobility and power consumption can not be considered too much. Advantages: fast network deployment, no complicated configuration; network stability, any node is broken, does not affect other equipment data transmission; network coverage, and a variety of broadband wireless access technologies (such as WLAN, WiMAX, UWB, 3G, etc.) Combined to form a larger multi-hop mesh structure. Disadvantages: Has a certain delay, not suitable for real-time monitoring applications, network capacity is limited. Bluetooth / IEEE 802.15.1 protocol Earliest Bluetooth technology began in 1994, developed by Ericsson of Sweden. It uses Frequency-hopping Spread Spectrum, the communication frequency band is 2.402GHz-2.480GHz. Up to now has been updated nine versions, namely Bluetooth 1.0 / 1.1 / 1.2 / 2.0 /2.1/3.0/4.0/4.1/4.2, communication radius extends from a few meters to several hundred meters. WeChat and Baidu Cloud are not popular at the moment, we are always used to open the Bluetooth device in the phone, the phone fun and good things to share with friends around. Bluetooth technology is widely used in mobile devices such as mobile phones and PDAs, PCs, GPS devices and a large number of wireless peripherals (Bluetooth headsets, Bluetooth keyboards, etc.). Bluetooth technology is also closely follow the pace of development of things. The latest Bluetooth 4.2 data rates up to 1Mbps, privacy features more powerful, Ipv6 network support. In the field of smart home, Bluetooth devices using Bultooth Smart technology can "talk" between devices and devices without networking. This can solve the sudden disconnection without WiFi in the case, the smart home devices will continue to work. Advantages: fast speed, low power consumption, high security. Disadvantages: fewer network nodes, not suitable for more control. 5.ZigBee / 802.15.4 agreement Zigbee was formally proposed in 2003, its appearance is to make up for Bluetooth communication protocols such as high complexity, power consumption, proximity, network size is too small and so on. The name is taken from a bee and the bees convey the pollen's location information to their companions by "flying" and "zig" shaking their wings to form a communication network in the group. ZigBee can operate in the three frequency bands 868MHz-868.6MHz, 902MHz-928MHz and 2.4GHz-2.4835GHz, the last of which is worldwide and 16 channels, and the band is a free, exempted radio band. Three band transmission rates are 20kbps, 40kbps and 250kbps.
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