WiFi is also an indispensable role for 5G. In the initial stage of 5G commercial use, the network has not yet achieved full 360-degree coverage. Especially when many smart terminal devices do not support 5G, the "5G + WiFi" CPE is used Popular, the industry dubbed the "pseudo 5G" transition plan. Even if 5G is popularized in the near future, limited by the coverage of base stations at high frequencies, it is impossible to cover every corner. Under the drive of high speed and low cost, WiFi6, which emphasizes high transmission rate, will be further popularized. .
The role of WiFi6 in WLAN, just like the role of 5G in WWAN, is a step-by-step upgrade of the communication system that caters to consumers' high bandwidth requirements.
Smart cities In the mainstream WLAN network technology group, WiFi plays the most intimate and popular role. You can use Bluetooth or Zigbee, but you cannot use WiFi ...
WiFi is also an indispensable role for 5G. In the initial stage of 5G commercial use, the network has not yet achieved 360-degree coverage, especially when many smart terminal devices do not support 5G. The use of "5G + WiFi" CPE is popular. , Which is dubbed the "pseudo 5G" transition plan by industry insiders.
Even if 5G is popularized in the near future, limited by the coverage of base stations at high frequencies, it is impossible to cover every corner. Under the drive of high speed and low cost, WiFi6, which emphasizes high transmission rate, will be further popularized. .
What needs to be further explained here is that 5G in WiFi is not the same as the 5G we usually hear (the 5G mentioned in the previous paragraph). We often say that 5G is the fifth generation of mobile communication, and 5G in WiFi is 5GHz, which refers to wireless frequency / spectrum.
Because WiFi mainly works in the unlicensed ISM band (Industrial Scientific Medical), the 2.4GHz band (range 2.4-2.4835GHz) and 5GHz band (range 5.725-5.875GHz) available for WiFi are all microwave bands.
WiFi5 to WiFi6 is a technological evolution and a standard evolution. The scale of the industry is large, and the market space is also broad, but it is difficult to explore entrepreneurial opportunities. This is not a breakthrough and DIAN FU technology, from WiFi4, WiFi5, to WiFi6, it is just a smooth upgrade of the original technology, everyone is busy, the game rules are still the original rules, the game players are still the original players, Everyone joins the party and watch the fun together. Opportunities are available, but they are not gold everywhere.
Let's see what WiFi6 is.
First of all, the word WiFi is a "stage name". The underlying technology is wireless communication technology, including MU-MIMO, OFDMA, etc. which are recommended by WiFi6. The corresponding industry standard is the 802.11 series, the behind the scenes is the IEEE, and the IEEE active Player is The IC giants headed by Intel.
That is: the standard setting is in IEEE-SA, and the industry promotion is in the WiFi alliance, which performs its own duties and binds each other's interests.
The WiFi standard (802.11 series) was born in 1999. After 20 years of development, there will be a standard upgrade almost every 5 years or so. The main purpose is to upgrade the bandwidth.
In fact, a few years ago, WiFi has not been differentiated in the same way as 2G, 3G, 4G, and 5G. The industry generally distinguishes according to the 802.11 series of standards. For example, this router supports 802.11b / g / n / ac â€¦ The real epoch is that from October 2018, the WiFi Alliance, as a "non-profit" business organization, in order to better promote WiFi technology, imitating the way of mobile communication naming, the WiFi is divided into layers, so that, Very clear, which greatly facilitates business promotion (chao) and wide (zuo).
Last year â€™s hot-selling Huawei was suspended from membership by the WiFi Alliance. If it becomes true, it will also affect Huawei â€™s future industrial layout in the WiFi field. Standard participation declines, and its own technical interests are difficult to protect; product certification is blocked, and interconnection with other products will also It is difficult to guarantee. For WiFi6, the WiFi Alliance began to certify devices in 2019, so 2019 will also be the first year of the WiFi6 industry.
Among them, the WiFi6 that this article focuses on is based on the new 802.11ax standard. As mentioned earlier, the purpose of the evolution of the 802.11 standard is mainly to improve the transmission rate.
From the most basic principle of communication (Shannon's theorem), the effective way to increase 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, the richer the spectrum resources. The GHz frequency band is comparable to MHz The frequency band resources are abundant.
Therefore, the focus of WiFi6 is on the 5GHz frequency band, and the large rate reaches 600Mbps under the single frequency bandwidth of 80MHz, and the user experience can be greatly improved.
In addition to frequency enhancement, WiFi6 also uses MU-MIMO and OFDMA physical layer technologies. In fact, in the field of wireless communication, there are too many overlaps between different modes of wireless communication, especially the underlying technology.
Everyone should have an impression. In 5G mobile communication publicity and popularization articles, they also emphasize OFDMA and MU-MIMO as the core technology.
The author's earliest exposure to OFDMA was around 2006. When WiMAX technology (802.16 series) was industrialized as an emerging technology, it also focused on promoting its physical layer modulation technology, OFDM and OFDMA ...
The so-called OFDM and OFDMA are like the Beijing-Tibet high-speed lanes. Each user's communication is a fleet. The fleet pulls a variety of data. There are car fleets, taxi fleets, truck fleets ... â€¦ Each fleet comes and is assigned a fixed lane. This is OFDM. Therefore, there will be idle car lanes and congested truck fleets, and resources cannot be effectively used. OFDMA allows different fleets to squeeze in according to the availability of lanes, and each lane forms several "sub-virtual lanes", improving efficiency and lane utilization.
MU-MIMO (MulTI-User MulTIple-Input MulTIple-Output) is better understood. MIMO refers to multiple antennas, and the ability of multiple antennas to transmit data must be greatly improved, just like One lane becomes four lanes; and 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 user connections that can be supported).
In fact, since WiFi4, downlink MU-MIMO has been supported. The wireless router supports multi-antenna multi-user. With WiFi6, both uplink and downlink support multi-antenna multi-user, which can support 8 users to simultaneously uplink and downlink for data transmission.
The above are the two core technologies of WiFi6. In general, wireless communication is almost the same, and the technical development has basically reached the top. The core principles of different communications are similar, and the technical overlap is great. The difference is more in commercial application scenarios, as well as the wireless communication spectrum used, whether it is a licensed band or an unlicensed band.
Next, let's take a look at the specific industry development. As in other mobile communication fields, the WiFi industry chain also includes three major links: chips, modules, and equipment. The equipment includes a transmitting terminal (wireless AP) and a receiving end (various 3C, IoT devices, etc.).
The demand for terminals is the most important driving force for the WiFi industry. The annual global shipments of WiFi chips are up to billions, of which smartphone shipments are as high as 1.3 billion in 2019, and WiFi is almost standard, occupying the WiFi chip. Half of the country. The rest are notebook computers, tablet computers, and Internet of Things terminal devices, such as smart homes, wearable devices, VRARs, and in-vehicle electronic devices.
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