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When the user equipment communicates with the AP1, because the equipment receives the interference signal of the AP2 with the same frequency, the user equipment will mistakenly think that the cell of the AP1 is being occupied by other devices in the cell at this time, so wait for the next time period to send. As a result, network performance is degraded. Not only multi-cell networking, this kind of interference problem will also occur when the Wi-Fi AP is very close. For example, although you have only one wireless AP in your home, if your next-door neighbor has an AP deployed on the same channel as you, CCI will also reduce the success rate of your device access. Sadly, most manufacturers put Wi-Fi AP’s default channel on the first channel when the device leaves the factory. In this way, the problem of interference is even more serious. If you find this problem, you might as well change the Wi-Fi AP channel at home, which will significantly reduce interference and increase Internet speed. The solution of Wi-Fi 6 is to distinguish the local cell from the interference cell by introducing BSS Coloring (Cell Color coding) technology into the MAC layer. In other words, when working on the same channel, the AP that interferes with each other will be distinguished by different color codes.

Due to the spread of the global COVID-19 epidemic in 2020, automobile production is in the doldrums (figure 1). The number of cars produced worldwide, which was 92.18 million in 2019 before the COVID-19 epidemic, fell by 14.56 million to 77.62 million in 2020 and appears to have fallen by 1.2 million to 76.42 million in 2021. The decline in car production in 0A2020 was caused by the COVID-19 epidemic, which led to a sharp drop in demand. However, the downturn in car production in 2021 is mainly due to a shortage of semiconductors. In fact, by 2021, the shortage of semiconductors has made it impossible to build cars, and the governments of Japan, the United States and Germany, with automobile as the core industry, have made requests to TSMC to increase the production of on-board semiconductors through the government of Taiwan. The semiconductors in short supply at that time were 28nm logic semiconductors and MCU (Micro Controller Units, commonly known as “microcontrollers”).

In the early CPUs, the chip integration level was very low. The CPU was a single chip. It only integrated an arithmetic unit and a controller. It could only calculate and control. At this time, the internal capacity of the CPU was useless. Memory, the CPU left The memory cannot be calculated. Back then, there was no memory in the CPU because the memory could not be integrated, and others such as the serial port could not be integrated, so there was only a single CPU. If you need to use the serial port, you need to use a serial port controller chip outside the CPU. The PCB traces are connected to the CPU, and then the entire PCB board is composed of the CPU, and these peripheral chips is called a system board. This system board can communicate with another system board. The CPU communicates with another system through its serial port controller. The serial port controller on the board communicates, and functions such as the serial port controller cannot be integrated into the CPU chip. For example, if the LCD is also used here, it is necessary to add an LCD controller chip to the periphery and connect it to the CPU through wiring. A whole board composed of these chips is called a system board. These UART controllers and LCD controllers are called peripherals. Combining them with the CPU on one board is the function implemented by a current K60 chip, but they are integrated into a small chip. The peripherals here refer to the inside of the system board, the peripherals outside the CPU are called peripherals, the CPU is called the internals, and there are only arithmetic units and controllers inside, which are called internals.

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