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As a fresh graduate, I participated in the construction of urban lighting systems, including the urban bus system. At that time, a problem that bothered me was how to connect stably and efficiently in such a linear network?
At that time, I made some optimizations based on the classic 802.15.4 protocol. Due to my personal technical skills, the number of applications was limited;
The LPWAN technology introduced to you today is also aimed at solving similar problems;
Maybe domestic NB-IoT and LoRa are promoted too well, and Wi-Sun's name is not very famous, but if it is in the smart meter industry or in overseas markets, it should be well-known;
01
Wi-Sun Overview
As early as 2008, there was no unified wide-area IoT wireless communication standard in the industry, but there were various wide-area IoT communication protocols in the industry at that time. Standard 802.15.4, but interconnection cannot be realized at the application layer. In order to solve this complex problem, a large-scale wide-area wireless mesh network based on IP technology came into being, referred to as Wi-SUN FAN (Wireless Utility Field Area Network), which is committed to becoming the global wireless mesh network standard and Be interoperable.
Wi-SUN (Wireless Smart Ubiquitous Network) technology is based on the open specifications of IEEE 802.15.4g, IEEE 802 and IETF IPv6 standards.
The characteristics of Wi-SUN transmission technology are long-distance transmission, security, high scalability, intercommunication, easy deployment, Mesh mesh network, and low power consumption;
02
Wi-Sun Network Topology and Protocol
Wi-Sun supports one-to-one/one-to-many (HAN) and Mesh topology (FAN), as shown in the schematic diagram of the network mesh structure as shown below;
Like Bluetooth Mesh, nodes also support relay propagation, and can support 24-hop relays (Bluetooth Mesh does not recommend >4 hops);
Unlike Bluetooth Mesh, Wi-Sun is a routing-based protocol, not flooding-based;
The network topology of each layer of Wi-Sun is as follows:
It can be seen that the application layer is actually somewhat similar to Matter and Thread, both of which can support the network;
The routing used by Wi-Sun is RPL;
03
Advantages of Wi-Sun
The main competition of Wi-Sun is LoRaWAN and NB-IoT. From the perspective of industry standards, Wi-Sun is based on the popular IEEE 802.15.4g and IPv6 standards. Currently, it has 250+ members and released 150+ certified products; LoRaWAN is based on Semtech’s unique Some LoRa technologies currently have 400+ members. Due to the private deployment of LoRa, there is relatively little guarantee in terms of device compatibility; NB-IoT is based on 3GPP and has high requirements for base station deployment;
In terms of performance and cost, as shown in the figure below (excerpted from Zichida WeChat ID)
04
Member of Wi-Sun Alliance
Yesterday’s article mentioned that some members of MIOTY are unfamiliar, but Wi-Sun Alliance is different. I seem to know them all...For example, the highest-level Promoter member below
In terms of chips, there are many chips to choose from, such as TI, ST, Silabs, Renesas, etc.
OF
Silabs
Renesas
05
Wi-Sun application scenarios
Wi-Sun is currently mainly used in meter reading and lighting systems in overseas cities. Combined with overseas city brains, it can tell many stories, such as the following successful cases;
Internet of Things
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