LED intelligent lighting will greatly enhance the added value of the product, and its development space is much larger than traditional lighting products. As a long-term growth kinetic energy after the rapid replacement of LEDs, wireless technology plays a vital role in smart homes or smart lighting. Today, United States Instruments (China) Co., Ltd. Zhou Yizhen, Xu Liming and Philips (China) Investment Co., Ltd. Zhang Yuning three technical experts for us to interpret the Zigbee ad hoc network Mesh network. Let’s take a look around~ In the big part of the Internet of Things, the heat of intelligent lighting is also heating up. In addition to its safety, energy saving, comfort and efficiency, more and more customers are developing and accepting intelligent lighting items and systems. Startups from Big Mac's multinationals and springing up are hoping to take the lead in this emerging field. Speaking of intelligent lighting, in addition to the continuous improvement of the light source part, it is impossible to mention various wireless communication technologies. They bear an important part of intelligent lighting from closed to open, from private network to a broader system. In the development and application of wireless intelligent lighting products, the most common problem is which wireless technology should be chosen. In the existing stock products and systems, ZigBee is the leader in the market. The "Mesh" network of ZigBee's ad hoc network is considered by the lighting industry to be the closest to the actual scene. However, it must be mentioned that in the wireless smart lighting market, other wireless connection technologies have begun to be promoted under the banner of “Meshâ€, hoping to attract industry attention and expand their market share. So many manufacturers hold ZigBee in their hands, watching low-power Bluetooth, and then think about "embracing" the Internet's Wi-Fi, it is really uncertain. Let us temporarily leave the name of the name "Mesh" and think about it first. What are the elements of a stable and reliable lighting network: 1. Balance the load. The number of nodes in an intelligent lighting system network can range from several to tens or even hundreds, which requires the network to provide greater redundancy for load balancing. To achieve load balancing, you need to work hard on the routing protocol, reasonably create routing and routing, and continue to optimize. 2. Robustness. Robustness is critical in lighting networks, especially in networks with a large number of nodes. A considerable number of intelligent lighting systems are deployed indoors, and the occlusion, reflection, and interference in the radio environment of the space structure place higher demands on the robustness of the system. Reasonable creation and maintenance of routes, as well as different types of communication messages, have a decisive influence on the robustness of the network. 3. The reusability of space. In a limited radio frequency spectrum, how to properly avoid and distribute with different technical standards is also a test of the stability of a lighting network. The division of spectrum, the use, and the synergy of software and protocols play a large role. 4. In intelligent lighting systems, it is often encountered that the products and solutions of different manufacturers are interconnected. If the interoperability of the protocol is fully considered at the beginning of the protocol, it can greatly simplify the application and improve the standardization of the application and development process. With the above characteristics and requirements, let us look at whether different technologies can reflect these elements. ZigBee -- the master of Mesh technology ZigBee technology has been researching and promoting the Mesh network as the biggest signboard since the first day of its birth. Of course, it is also doubtful that Mesh is one of the most important missions. Low overhead routing algorithm The ZigBee routing protocol uses an AODV (Ad-hoc On Demand Vector) routing algorithm. The route discovery process is initiated according to the requirements of the node, and the routing table information is also established as needed. When a packet needs to be sent, if the routing table information of the destination node is not found, the node needs to start the route discovery process to establish routing table information. No route is required to initiate a large number of route discoveries to establish a routing table without requiring a certain amount of network resources. In addition, the routing table does not need to save the complete routing information, and only needs to save the next hop address to the destination node, corresponding to the destination node address and link state information, which greatly saves the maintenance cost of the route. The entire network not only ensures the routing is simple and fast, but also reduces unnecessary overhead. When communicating, only the relevant routing path communicates and does not interfere with other unrelated paths. This is especially suitable for large network applications. Shenzhen Innovative Cloud Computer Co., Ltd. , https://www.xcycomputer.com
August 13, 2024