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When WiFi 6 met WiFi 6+... Is WiFi 6 really full of blood?

CQCPCW @ 2020/05/23


The popularity of new technology will always be controversial. When WiFi 6 began to be familiar with more and more consumers, did the appearance of WiFi 6+ make some partners feel a little confused? Today, what Hon dad wants to share is WiFi 6 and WiFi 6+.



01


Will WiFi 6+ be a black technology boost?


Before we talk about the word "+" suffix, we may first look back at the origin of WiFi 6.


In September 16, 2019, the WiFi Alliance announced the launch of the WiFi 6 certification scheme, which aims to achieve the established standards of the next generation of 802.11ax Wi-Fi wireless communication technology. WiFi 6 is expected to be approved by the Institute of electrical and Electronic Engineers (IEEE) later in the fall of 2019.

Compared to the previous generation of WiFi 5 standard, WiFi 6 has faster outgoing efficiency and lower power consumption. Besides, WiFi 6 uses OFDMA technology, which is homologous with 5G, and intelligent frequency division technology, which can support more concurrent devices and enhance 4 times access capacity. Many concurrent access devices can reduce queuing phenomenon, interfere with coloring and avoid it, so that the delay will be reduced by 2/3. When the terminal equipment is on standby, it supports on demand wake-up function to reduce the power consumption of the terminal by 30% (data from TOTOLINK Lab).


In short, WiFi 6 is the new generation wireless network standard, WiFi 6 is very strong. So WiFi 6+ is its enhanced version. After all, many technology products or standards have "+" or "Pro" suffix, which will be stronger than that. Is WiFi 6+ suitable for this reason?


In fact, most consumers are exposed to WiFi 6+'s product promotion. Officially, it is because of its own developed trumpet chip, so the transmission distance is longer, the performance of the wall is faster and so on.



In fact, in the eyes of players, the real core of WiFi 6+ is to support the bandwidth of 160 MHz wireless channel. Many WiFi6 routers only support 80 MHz wireless channel bandwidth. In this contrast, this part of WiFi 6+ products fully play the potential of WiFi 6 router.


Such a statement sounds very cool. After all, no one wants to buy a router that lacks the performance of the router. It can become a so-called "castrated" version of the product. Is that true?




02


Mysterious wireless channel bandwidth


When the "160 MHz channel width" becomes the focus of WiFi 6+ and WiFi 6, things become much easier to understand, but for most wireless users, the word "wireless channel bandwidth" is somewhat unfamiliar.


Wireless channel is an image metaphor for the path between the transmitter and the receiver in wireless communication. For radio waves, it is transmitted from the transmitter to the receiver, and there is not a physical connection between them. The propagation path may also be more than one. In order to vividly describe the work between the transmitter and the receiver, we can imagine that there is an invisible link between the two. This link is called the channel.


The channel bandwidth is defined as a frequency pass band that allows the lower and upper frequency of the signal to be passed through the channel. For example, the passband allowed by a channel is 1.5kHz to 15kHz, and its bandwidth is 13.5kHz.


Supporting 160 MHz channel width is not the exclusive technology of a brand, nor is it the exclusive technology of WiFi6.


Generally, two WiFi antennas will be configured in the cell phone. If it is a WiFi 5 mobile phone, the maximum transmission speed of a WiFi antenna will be 433 megabytes (data transmission rate) under 80 MHz. The two antennas are 866 megabytes BPS, which can be converted to download speed theory at the fastest speed of 100 megabits per second.


If it is under the 160 MHz channel, the data can double to 1732 trillion BPS, or 200 trillion per second, of course, this is only a theoretical maximum bandwidth value.


USB3.0 we know that the maximum bandwidth value of the theory is 5GBPS, which is about 500000000000000 USB3.0 a second, but now many people have never seen such a fast transmission speed, but theoretically it can really be so fast.



Under the channel width of 80 MHz, the fastest transmission rate of one antenna of WiFi6 is 600 megabytes, which is faster than that of WiFi5's 433 megabyte BPS. If it is under 160 MHz channel, it will be much faster than that of BPS.  


The WiFi5 device can run on the channel width of 160 MHz. If the WiFi 6 device runs on the width of 80 MHz, the WiFi5 can reach up to 1732 megabytes, while the WiFi6 can only reach 1200 megabytes. The reason why WiFi5 WiFi5 is faster than WiFi6 is faster than WiFi6.


Is "full blood bandwidth" really important? In real time, WiFi 6 itself supports the channel width of 160 MHz, but because there are very few channels of 160MHz on the 5GHz band, there are only 1 in China. In China, there may be a part of the 1 channels spanning the dynamic frequency selective (DFS) channel. DFS means that there are many weather radar in the city, and the frequency of these radars is also 5GHz. Therefore, if we use the DFS channel, if we detect the radar, we must circumvent it, and the channel will not be used for a period of time.


There is a certain limitation of usage, but it does not mean that it is totally unusable and meaningless. In fact, the channel width value of 160 MHz is quite good.



03


Full blood bandwidth is not exclusive.


At present, the high-rise buildings in the metropolis are heavily interlaced with Lin Yu and Huxing. The overlapping of commercial and commercial channels, the more serious interference, and the overcapacity of bandwidth, the DFS channel seems to be necessary.


The ASUS RT-AX86U race routing, which was sent shortly before, was taken as an example. It supports DFS channel and provides additional 15 channels (4 mainland open), so as to effectively avoid signal interference and insufficient bandwidth usage.


Brand exclusive is indeed a good presence for a certain brand of fans, but in the technical perspective, it is clear that if the width of the 160 MHz channel is the core value of WiFi 6+, then the technology is really not exclusive to a brand.


In fact, as early as October 2019, the RT-AX88U WIFI 6 router released by ASUS supports 160MHz's channel width.



Is there a sense of embarrassment? Hon has always emphasized that in the product layout of the WiFi 6 wireless router, ASUS has a very large product line and gorgeous lineup, which can fully cover the entire market demand. But for the first time, I saw the concept of WiFi 6+ and tried to understand the meaning of the word "almost independent of the manufacturer", but did not want ASUS WiFi. 6 wireless routing products have long been available.



In October 29, 2019, ASUS RT-AX88U competition router first passed the official certification of Wi-Fi 6, and successfully completed the rigorous test of Wi-Fi alliance.


From the time line, ASUS's application in the channel width of 160MHz is obviously very early, but the public relations department under the criticism should be high profile.



Of course, in the product PR manuscript of ASUS RT-AX88U router, we can still see similar "characteristics, using the latest 802.11ax wireless standard, integrating OFDMA and 4X4 MU-MIMO technology, which can make use of 160MHz bandwidth and 1024-QAM modulation and coding advantages, can greatly enhance the speed of wireless connection." The description is just too low-key.


In fact, when Dad tested ASUS RT-AX86U a few days ago, he also found that the router provided 160MHz bandwidth support.


Obviously, 160MHz's channel width is not new, but WiFi 6 and WiFi 6+'s publicity problem also depends on how the partners can evaluate. Hon dad would like to remind us that although providing 160MHz bandwidth is a bright spot for products such as ASUS, it is not all WiFi. 6 routing can provide 160MHz bandwidth support!


So, in a sense, if you choose a router to save worry, the lion will still recommend ASUS. This treasure boy also promotes a lot of low-key, but when you suddenly find that it still has this function, it is definitely a great pleasure in life.

(Editor: Zhang Yi)



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Chinese:当WiFi 6遇到了WiFi 6+ ……WiFi 6真有“满血频宽”吗