Introduction: First, the ZigBee ad hoc network claims that the network size can reach 65,535 nodes, but this is only a theoretical value. Even if the true ZigBee ad hoc network reaches 1000 nodes, it is very difficult to operate stably. Even if it barely works, it will give people an unstable and unreliable feeling.
In people's daily life and industrial production, there are many wireless networking communication products that need to be used. In addition to GSM/3G/4G/Wi-Fi/Bluetooth, there are a large number of unmet needs. No one denies that this is a market with huge potential. Almost all international semiconductor giants have invested heavily in this field, such as TI, Silicon Labs, Semtech, ATMEL, AMICOM, Nordic, Freescale, NXP, etc. They all want to see the same blowouts as personal communication in mobile phones in this area. The reason is very simple, the composition of an embedded device with wireless networking communication functions is nothing more than the following elements:
1. Powerful + low power consumption microcontroller (CPU)
2. Power Amplifier Technology (PA)
3. Filter technology
4. Low Noise Amplifier Technology (LNA)
5. Small size
6. Low cost
It is not difficult for an engineer with a few years of experience in the electronics industry to find out that these technologies have already existed many years ago. They are scattered in different product lines of different manufacturers and integrated into one product. It's not hard. Another good news is that some manufacturers with forward-looking visions in recent years have started SoC integration innovations, which greatly simplifies the development. However, the most critical issues have not been given sufficient attention. That is, the diversification of IOT (Internet of Things) products is too much, and it is difficult to get full support and expression in a protocol stack.
A button battery-powered smart home detector with a few tens of bucks can be called an IOT device. An industrial wireless data collector with hundreds of bucks is also called an IOT device. It is a multi-thousand-dollar car. Networked wireless voice communication terminals also become IOT devices. A tens of thousands of individual wireless communication devices also become IOT devices. Historically, there has never been a single concept or product term with such a large span, covering almost all areas such as consumer electronics, industrial automation, and defense and military. These products from different fields all claim to have the function of ad hoc networks. This gives people the almost boundless imagination of wireless ad hoc network technology. The expectation of wireless ad hoc network products is getting higher and higher. It was even impractical.
One thing to note is that any wireless communication technology that has achieved great success is confined to a specific area, and is not boundless to expand its application areas. GSM/3G/4G has clearly positioned itself as a mobile phone service. Wi-Fi was clearly positioned as a notebook computer service in the early days. Bluetooth technology hopes to unify all wireless communication applications in the early days, and wireless headsets that eventually focus on mobile phones will become a firm foothold. In fact, it was not until the arrival of smartphones that Wi-Fi and Bluetooth technology really entered the daily lives of ordinary people. The number of Wi-Fi and Bluetooth technologies naturally appeared in astronomical expansion.
In 2001, ZigBee ad hoc network technology was officially born, waiting for it to have a good news and bad news. The good news is that people are eagerly anticipating that the technology can complete the original Bluetooth technology did not complete the "big unity", that is to say the cake is big; the bad news is that the big market environment has undergone earth-shaking changes The market has been highly decentralized and fragmented, and it is almost impossible to find a big market for the whole piece. This is equivalent to saying that although cakes are large, they are all small and hard-to-smash bones. It is quite strenuous, and when it's not careful, it's going to die. From the perspective of technical characteristics, ZigBee Ad Hoc seems to be a little under-prepared, and did not think that they were so desperate that even if they were born, they would have to get smashed or go to the factory to move bricks. Compared with Wi-Fi/Bluetooth, people would sit on it. The office is air-conditioned and the working environment is good.
Why is ZigBee ad hoc network a poor life? Because the ZigBee ad hoc network positioning is biased to "blue collar", but it is not a special "bandits", a bit like a petty bourgeoisie. Because as "white collar" and "bandits," it is completely two kinds of play. The white-collar work is very specific and works in one area. Wi-Fi claims to be the fastest for me, with 300 Mbps and 400 Mbps. Even Bluetooth is known for its low-power, point-to-point voice technology, which is nothing to say. The ZigBee ad hoc network is positioned at low power consumption, but low-rate networking may seem simple, but the challenge is actually much greater. The most important point is that it seems to require "hidden rules": you have to allow me to have a situation It's not too smart...
With the further testing and research of this technology, people only discovered that the technology has a certain range of use. Beyond this range, the performance of the technology is naturally not ideal. For engineers who respect science, they refuse to flicker. Doesn't that mean nonsense? Everyone knows this fact. Newton's gravitation has its scope of application. Not to mention you have ZigBee Ad Hoc technology? In fact, this range of people ZigBee ad hoc network association has long said, is a small number of nodes composed of static networks, low-density transmission behavior and relatively close communication distance thing. Beyond this range of applications, the ZigBee ad hoc network itself has not made any promise. This is like the "smoking is harmful to health" written in small letters on the packaging of cigarettes in China. You can't pay attention to it if you don't look carefully. So, everyone says that the basic fact is: "Every kind of technology has boundaries," and ZigBee's ad hoc network technology is no exception, but it carries too many expectations and there are too many The application can only say "Cho can't do it!" However, after all, it has created a trend that has attracted thousands of developers from all over the world to jump into the "wireless self-organization" Among the rivers of the "net" technology, this is where all the flowers bloom today and the hundred schools of thought contend.
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