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The popularization of WiFi 6 will greatly improve the user experience

Author: Shenzhen Science and technology time: March 25, 2020 source: egibl.com
Abstract: WiFi is also an indispensable role for 5g. In the early stage of 5g commercial operation, the network has not achieved full coverage, especially when many intelligent terminal devices do not support 5g, the "5g + WiFi" CPE

WiFi is also an indispensable role for 5g. In the early stage of 5g commercial operation, the network has not achieved full coverage, especially when many intelligent terminal devices do not support 5g, the adoption of "5g + WiFi" CPE is very popular, which is nicknamed as "pseudo 5g" transition scheme by industry insiders. Even if 5g becomes popular in the near future, limited by the coverage of base stations at high frequencies, it is impossible to cover every corner. Driven by high speed and low cost, WiFi 6, which emphasizes high transmission rate, will be more popular.

The role of WiFi 6 in WLAN, just like 5g in WWAN, belongs to the step-by-step upgrade and evolution of communication system to meet the high bandwidth demand of consumers.

You don't need to play a role in the mainstream network, but you don't need to play a role in the mainstream network

WiFi is also an indispensable role for 5g. In the early stage of 5g commercial operation, the network has not achieved full coverage, especially when many intelligent terminal devices do not support 5g, the adoption of "5g + WiFi" CPE is very popular, which is nicknamed as "pseudo 5g" transition scheme by industry insiders.

Even if 5g becomes popular in the near future, limited by the coverage of base stations at high frequencies, it is impossible to cover every corner. Driven by high speed and low cost, WiFi 6, which emphasizes high transmission rate, will be more popular.

What needs to be further explained here is that 5g in WiFi is not the same thing as the 5g we usually hear (5g mentioned in the previous paragraph). We often say 5g is the 5th generation mobile communication, while 5g in WiFi is 5GHz, which refers to the wireless frequency / spectrum.

Because WiFi mainly works in the unlicensed ISM frequency band (industrial scientific medical), the 2.4GHz band (range: 2.4-2.4835ghz) and 5GHz band (range: 5.725-5.875ghz) are available for WiFi, which belong to microwave frequency band.

Fi5 is an evolution of WI6 technology. The scale of the industry is large, and the market space is broad, but it is difficult to explore entrepreneurial opportunities. This is not a breakthrough and subversive technology. From wifi4, wifi5, to wifi6, it is just a smooth upgrade and evolution of the original technology. Everyone is busy. The rules of the game are still the original rules, and the players are still the original players. We all participate in the grand event and watch the heat together. There are opportunities, but gold is not everywhere, only gold in the sand.

Let's take a look at what wifi6 is.

First of all, WiFi is a "stage name". The underlying technology is wireless communication technology, including MU-MIMO, OFDMA, etc. advocated by WiFi 6. The corresponding industry standard is 802.11 series. IEEE is the driving force behind it. The most active player of IEEE is IC giants led by Intel.

Its role is to promote each other in the industry alliance.

WiFi standard (802.11 series) was born in 1999. After 20 years of development, there is a standard upgrade almost every five years. The main purpose is to upgrade the bandwidth.

 QQ screenshot 20200325150410.jpg

In fact, a few years ago, WiFi did not use the same way as 2G, 3G, 4G, 5g to distinguish. The industry generally uses 802.11 series standards to distinguish. For example, this router supports 802.11b/g/n/ac The real dating is from October 2018. As a "non-profit" business organization, WiFi alliance, in order to better promote WiFi technology, imitates the naming method of mobile communication, and divides WiFi into different levels. In this way, it is extremely clear and greatly facilitates the commercial promotion.

Huawei, which was popular last year, was suspended by the WiFi alliance. If it comes true, it will also affect Huawei's future industrial layout in the WiFi field. The standard participation will decline, and its own technical interests will be difficult to protect. The product certification will be blocked, and the interconnection with other products will be difficult to guarantee. For WiFi 6, the WiFi alliance began to certify devices in 2019. Therefore, 2019 is also regarded as the first year of WiFi 6 industry.

The main purpose of this paper is to improve the transmission rate of 802.11.

According to the most basic principle of communication (Shannon theorem), the most effective way to improve the transmission rate of wireless communication is to increase the bandwidth, and the most direct and crude way to increase the bandwidth is to increase the frequency. The higher the frequency is, the more abundant the spectrum resources will be, and the resource of GHz band will be much more abundant than that of MHz frequency band.

Therefore, wifi6 focuses on 5GHz band, and the maximum speed of 80MHz single bandwidth can reach 600mbps, and the user experience can be greatly improved.

In addition to frequency enhancement, WiFi 6 also uses MU-MIMO and OFDMA physical layer technology. In fact, in the field of wireless communication, different wireless communication modes, especially the underlying technology, have too much overlap.

You should also have the impression that OFDMA and MU-MIMO are the core technologies in the publicity and popularization of 5g mobile communication.

 Sf-2450od wireless coverage application legend.jpg

The author first came into contact with OFDMA around 2006. When WiMAX Technology (802.16 Series) was industrialized and popularized as a new technology, he was also focusing on promoting its physical layer modulation technology, OFDM and OFDMA

The so-called OFDM and OFDMA are just like the lanes of Beijing Tibet expressway. Each user's communication is a motorcade with various data. There are cars, taxis and trucks Every team will be assigned a fixed lane, which is called OFDM. As a result, the car lane will be idle and the truck fleet will be congested, and the resources can not be effectively utilized. OFDMA allows different teams to squeeze in according to the idle situation of the lane, and each lane forms several "sub virtual lanes", which improves the efficiency and lane utilization.

And MU-MIMO (multi user mutiple input Multiple input multiple output (MIMO) is a better understanding. MIMO refers to multiple antennas, and the ability of multiple antennas to transmit data will certainly be greatly improved, just as one lane becomes four lanes; while multi-user refers to that the base station can communicate with multiple users at the same time (note that at the same time, it is not the maximum number of users that can be connected).

In fact, WiFi 4 has been supporting downlink MU-MIMO. Wireless routers support multi antenna and multi-user. In WiFi 6, both uplink and downlink support multi antenna and multi-user, and can support 8 users for data transmission in uplink and downlink simultaneously.

In general, more than two wireless communication technologies have been developed. The core principles of different communications are similar, and the technology overlaps greatly. The difference is more in the commercial application scenarios, as well as the wireless communication spectrum, whether it is authorized or not.

Next, let's take a look at the specific industrial development. Like other mobile communication fields, WiFi industry chain also includes three links: chip, module and device. The equipment includes transmitting terminal (wireless AP) and receiving terminal (various 3C, IOT equipment, etc.).

The demand for terminals is the core driving force of the WiFi industry. The global WiFi chip shipment amounts to billions every year, of which the annual shipment of smart phones is as high as 1.3 billion in 2019, and WiFi is almost standard configuration, accounting for half of the WiFi chips. Other devices, such as mobile terminals, mobile devices, such as mobile computers and tablet devices, are wearable.


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