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In the past Wi-Fi technology, intercell co-channel interference (Co-Channel Interference,CCI) is another important factor affecting channel capacity. The core of CSMA/CA is to listen before you speak (listen before talk,LBT). The device monitors the wireless channel first and sends data without being occupied. In the case of multi-AP mesh networking (AP,Access Point, wireless access point), the equipment in the cell will listen to the interference signal of the cell adjacent to the same channel, causing the device to mistakenly think that the wireless channel of the cell is being occupied at this time, so stop transmitting. This kind of interference will significantly reduce the network capacity when the network is not optimized or the number of available channels is very small. As shown in the figure below, the four Wi-Fi AP are networked with three channels. However, since there are only three channels available, AP1 and AP2 have to be deployed on the same channel Channel 6, when the signal of AP2 is interference to the user equipment belonging to AP1-Overlapped Basic Service Set (OBSS, overlapping basic service units, which can be understood as overlapping cells with the same frequency).
Then, as demand for cars picks up in the fall of 2020, Toyota Denso Renesa plans to order 28nm semiconductors from TSMC again, but there is no room to produce in-car semiconductors because TSMC lines are occupied by other semiconductors. Although the inventory in the autumn and winter of 2020 exceeded the limit, by 2021, inventory had bottomed out, coupled with the shortage of 28nm semiconductors, cars could not be made. 28nm is the last generation of planar transistors (FinFET from 16 / 14nm to 3D) (2) do not use self-aligned double pattern (SADP) (will use SADP from FinFET) (3) Renesas vertical integration (integrated equipment manufacturer IDM), for example, outsource production to FinFET from this generation. In short, 28nm semiconductors produced by TSMC and other contract factories have a good performance-to-price ratio, so many electronic devices, including automobiles, use this semiconductor. At the invitation of the Japanese government, the TSMC Kumamoto plant, which will begin operation in 2024, will also mainly produce such 28nm semiconductors.
SoC (SystemonChip): refers to a system on a chip, that is, integrating multiple electronic systems into a single chip, which can process digital signals, analog signals, and even mixed signals, and is often used in embedded systems. SoC is a system-level chip, which has the characteristics of high integration of MCU and supercomputing power of MPU, that is, it has built-in RAM and ROM and is as powerful as MPU. The SoC can store and run system-level code, that is, it can run an operating system (mainly LinuxOS). It can be compared in this way: MCU is only a chip-level chip, while SoC is a system-level chip. It integrates the advantages of MCU and MPU, that is, it has built-in RAM and ROM and is as powerful as MPU.
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