Underground garage vehicle terminal communication method and device, vehicle

Abstract

The application discloses an underground garage vehicle-mounted terminal communication method, device and vehicle. The method comprises the following steps: when the current residual capacity of a backup battery and the current reference signal receiving power both satisfy a physical degradation condition, entering a bottom layer feature extremely simple broadcast mode; reading the current level signals of each actuator and sensor, and mapping the current level signals into a current state word; obtaining a differential mask register value by a master microprocessor according to the current state word; extracting non-zero bytes from the differential mask register value, and obtaining a differential state payload according to the non-zero bytes; obtaining a channel physical feature by a radio frequency baseband processing chip according to a downlink reference signal; obtaining a physical payload by the master microprocessor according to the differential state payload and the channel physical feature; and obtaining a corresponding cover sequence code bit stream according to the physical payload and sending out the cover sequence code bit stream. Through the above method, the problem that long message air transmission time is too long and is prone to sending failure in burst noise is solved.

Description

Technical Field

[0001] This application relates to the field of vehicle communication technology, and in particular to communication methods, devices, and vehicles for in-vehicle terminals in underground parking garages. Background Technology

[0002] In modern electric vehicle Internet of Things (IoT) systems, the onboard communication terminal is responsible for reporting vehicle status (such as door lock status, remaining battery power, satellite positioning coordinates, etc.) to the cloud server in real time. When the vehicle enters areas with severe signal obstruction, such as underground parking garages or tunnels, and the user locks the car and leaves, the onboard communication terminal still needs to complete a final critical status report.

[0003] In conventional engineering implementations, vehicle-mounted communication terminals typically package various sensor data into a structured text data exchange format (such as key-value pairs), along with redundant information such as protocol headers and heartbeat packets, forming a complete data packet that is usually more than 150 bytes in length. Then, a transmission request is sent to the base station through a connection-oriented transmission control protocol.

[0004] In extremely weak signal environments (such as underground parking garages), conventional R&D approaches often focus on "network-level retransmission mechanisms" or "increasing RF transmission power." However, this approach overlooks a fundamental physical fact: in a basement with extremely weak signals and severe background noise, a 150-byte message requires tens of milliseconds of continuous transmission time at the physical layer. In a harsh channel filled with random impulse interference, it is impossible to maintain a "clean, interference-free time window" of tens of milliseconds, meaning that long messages are almost inevitably damaged by noise midway through transmission.

[0005] Because the message is corrupted, the base station cannot return an acknowledgment frame. The vehicle terminal's conventional processing mechanism will control the RF power amplifier to operate at full load continuously, initiating dozens of invalid retransmission attempts. This not only physically prevents successful transmission but also causes the terminal's small-capacity backup battery to be completely drained in a very short time, ultimately leading to a complete power outage and loss of connection for the vehicle in the basement. Therefore, it is necessary to solve the problem of long message transmission times leading to high susceptibility to transmission failures in the face of sudden noise, and the rapid depletion of the terminal's backup battery due to frequent retries. Summary of the Invention

[0006] The communication method, device, and vehicle for the vehicle-mounted terminal in the underground parking garage provided in this application solve the problem that long message transmission time is too long, which makes it easy to fail to send in the event of sudden noise, and causes the terminal's backup battery to be quickly depleted due to frequent retries.

[0007] In a first aspect, this application provides a communication method for an in-vehicle terminal in an underground parking garage. The method includes: a main control microprocessor reading the current remaining battery power of the in-vehicle terminal's backup battery and the current reference signal receiving power of the in-vehicle terminal's RF baseband processing chip; when both the current remaining battery power and the current reference signal receiving power meet the physical degradation conditions, the main control microprocessor enters a low-level simplified broadcast mode, cutting off the power supply circuits of the global satellite positioning RF receiving module and other non-essential environmental sensors, and sending a low-level reset and reconfiguration command to the RF baseband processing chip, freezing the currently running connection-oriented long-connection network protocol stack; the main control microprocessor reads the current level signals of each actuator and sensor through the low-level bus and maps the current level signals to a current status word; the main control microprocessor writes the current status word and the basic status word into an internal arithmetic logic unit, so that the arithmetic logic unit performs a bitwise XOR operation on the current status word and the basic status word to obtain a differential mask register value; the main control microprocessor processes the differential mask register value... Non-zero detection is performed. When the detection result is non-zero, the non-zero byte is extracted from the differential mask register value. The non-zero byte and the corresponding actual change value are concatenated to obtain a single byte of differential state payload. The main control microprocessor wakes up the physical layer measurement mechanism of the RF baseband processing chip through the internal instruction bus, so that the RF baseband processing chip locks the downlink reference signal sent by the serving base station and converts the downlink reference signal into a digital baseband signal. The main control microprocessor instructs the RF baseband processing chip to perform dimensionality reduction extraction on the digital baseband signal to obtain two bytes of channel physical characteristics. The main control microprocessor concatenates the differential state payload and the channel physical characteristics to obtain three bytes of physical payload. The main control microprocessor uses the physical payload as the offset of the memory address to access the static mapping lookup table in the non-volatile read-only memory to obtain the corresponding overlay sequence code bit stream. The main control microprocessor sends the overlay sequence code bit stream to the RF baseband processing chip so that the RF baseband processing chip can send out the overlay sequence code bit stream.

[0008] In some embodiments, when both the current remaining battery power and the current reference signal received power meet the physical degradation conditions, the main control microprocessor enters the low-level feature simplified broadcast mode, including: the main control microprocessor constructing a sliding time window; the main control microprocessor judging the physical degradation conditions of the current remaining battery power and the current reference signal received power within the sliding time window in real time; when the reference signal received power is lower than a preset extremely weak network fading power threshold for multiple consecutive times within the sliding time window, and when the current remaining battery power is lower than a preset over-discharge voltage safety threshold, the physical degradation conditions are met; the main control microprocessor enters the low-level feature simplified broadcast mode.

[0009] In some embodiments, the main control microprocessor enters the low-level feature simplified broadcast mode, including: the comparator logic inside the main control microprocessor triggers a high-priority external hardware interrupt pin level to flip and outputs a hardware interrupt signal; after the main control microprocessor's main interrupt controller captures the hardware interrupt signal, it immediately suspends all currently executing regular application layer software threads, pushes the context data of the critical registers onto the stack for protection, and forces the system state machine pointer to jump to the preset starting memory address of the low-level feature simplified broadcast mode, thus entering the low-level feature simplified broadcast mode.

[0010] In some embodiments, the main control microprocessor reads the current level signals of each actuator and sensor through the underlying bus and maps the current level signals to the current status word, including: if the vehicle's controller area network bus or general input / output pin triggers a status reporting request, the main control microprocessor reads the current level signals of each actuator and sensor through the underlying bus; the main control microprocessor maps the current level signals to the current status word according to the same bit field mapping rules as the basic status word.

[0011] In some embodiments, before the main control microprocessor wakes up the physical layer measurement mechanism of the RF baseband processing chip via the internal instruction bus, so that the RF baseband processing chip locks the downlink reference signal sent by the serving base station and converts the downlink reference signal into a digital baseband signal, the process includes: the main control microprocessor detecting the hardware status pin of the global satellite navigation module or the last valid positioning timestamp; the main control microprocessor determining whether it is in a satellite signal blind zone based on the hardware status pin or the last valid positioning timestamp; when it is confirmed that it is currently in a satellite signal blind zone, the main control microprocessor completely destroys the standard structured text frame originally used to assemble the location information in memory, thereby eliminating the occupation of the transmission buffer by invalid location information and blocking the resource consumption of invalid zero-value characters in subsequent air interface transmission.

[0012] In some embodiments, the main control microprocessor instructs the RF baseband processing chip to perform dimensionality reduction extraction on the digital baseband signal to obtain a two-byte channel physical feature. This includes: the main control microprocessor instructs the RF baseband processing chip to perform dimensionality reduction extraction on the digital baseband signal so that the hardware digital signal processing unit of the RF baseband processing chip locks only the two dominant frequency subcarriers with the strongest signal energy in the digital baseband signal and directly discards their phase information, only calculates and extracts the signal amplitude fading values ​​of the two subcarriers, and maps the calculated and extracted signal amplitude fading values ​​to hexadecimal physical quantization indicators through a hardware quantizer to obtain the channel physical feature, and stores the channel physical feature in the diagnostic register of the RF baseband processing chip; the main control microprocessor reads the channel physical feature from the diagnostic register.

[0013] In some embodiments, the static mapping lookup table includes cyclic overlay sequence codes generated by exhaustive computation; the geometric characteristic of the cyclic overlay sequence codes is that any two different three-byte data sequences map to a bit sequence that maintains a maximized physical Hamming distance.

[0014] In some embodiments, the main control microprocessor sends the overlay sequence code bitstream to the RF baseband processing chip, so that the RF baseband processing chip transmits the overlay sequence code bitstream. This includes: the main control microprocessor sending the overlay sequence code bitstream to the transmit buffer register of the RF baseband processing chip, so that the RF baseband processing chip adds a basic Media Access Control (MAC) hardware addressing header and a Cyclic Redundancy Check (CRC) tail for integrity verification to the overlay sequence code bitstream, encapsulating the overlay sequence code bitstream into a physical broadcast raw data frame; after receiving the transmit trigger command, the RF baseband processing chip first controls the RF receiving front-end to perform channel noise floor energy sensing; the RF baseband... The analog-to-digital converter with a processing chip collects the level values ​​of background thermal noise and pulse interference in the current frequency band. When the level values ​​of background thermal noise and pulse interference sampled for several consecutive times are lower than the set interference blocking threshold, the control logic inside the RF baseband processing chip instantly pulls up the level of the power control pin to supply power to the RF power amplifier. At the instant the RF power amplifier starts, the physical broadcast raw data frame is ejected into the air in the form of electromagnetic waves within two milliseconds. A few microseconds after the transmission is completed, the RF baseband processing chip immediately cuts off the power supply to the RF power amplifier and puts the entire communication module of the RF baseband processing chip into a deep sleep power-off state through the hardware reset pin.

[0015] Secondly, this application provides an underground parking garage vehicle-mounted terminal communication device, which includes a main control microprocessor, a radio frequency baseband processing chip, and a memory. The main control microprocessor is connected to the radio frequency baseband processing chip and the memory, and the memory stores a computer program. The main control microprocessor is used to call the computer program to implement the underground parking garage vehicle-mounted terminal communication method provided in the first aspect.

[0016] Thirdly, this application provides a vehicle that includes the underground garage vehicle-mounted terminal communication device provided in the second aspect.

[0017] The beneficial effects of this application are as follows: Unlike existing technologies, the underground parking garage vehicle terminal communication method, device, and vehicle provided in this application include: a main control microprocessor reading the current remaining power of the vehicle terminal's backup battery and the current reference signal receiving power of the vehicle terminal's RF baseband processing chip; when both the current remaining power and the current reference signal receiving power meet the physical degradation conditions, the main control microprocessor enters a low-level feature-based simplified broadcast mode, cutting off the power supply circuits of the global satellite positioning RF receiving module and other unnecessary environmental sensors, and sending low-level reset and reconfiguration instructions to the RF baseband processing chip, freezing the currently running connection-oriented long-connection network protocol stack; the main control microprocessor reads the current level signals of each actuator and sensor through the low-level bus and maps the current level signals to a current status word; the main control microprocessor writes the current status word and the basic status word into the internal arithmetic logic unit, so that the arithmetic logic unit performs a bitwise XOR operation on the current status word and the basic status word to obtain the differential mask register value; the main control microprocessor performs a non-zero detection on the differential mask register value, and when the detection result is non-zero, it reads the current status word and the current status word. Non-zero bytes are extracted from the differential mask register value, and the actual change values ​​corresponding to the non-zero bytes are concatenated to obtain a single-byte differential state payload. The main control microprocessor, through its internal instruction bus, wakes up the physical layer measurement mechanism of the RF baseband processing chip, enabling the RF baseband processing chip to lock onto the downlink reference signal sent by the serving base station and convert the downlink reference signal into a digital baseband signal. The main control microprocessor instructs the RF baseband processing chip to perform dimensionality reduction extraction on the downlink reference signal, obtaining two bytes of channel physical characteristics. The main control microprocessor concatenates the differential state payload and the channel physical characteristics to obtain a three-byte physical payload. The main control microprocessor uses the physical payload as an offset in the memory address to access the static mapping lookup table in the non-volatile read-only memory to obtain the corresponding overlay sequence code bitstream. The main control microprocessor sends the overlay sequence code bitstream to the RF baseband processing chip, enabling the RF baseband processing chip to send the overlay sequence code bitstream out. This solves the problem of long message transmission times being too long, leading to easy transmission failures in burst noise and rapid battery depletion due to frequent retries. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a flowchart illustrating an embodiment of the underground parking garage vehicle terminal communication method provided in this application; Figure 2 This is a schematic diagram of an embodiment of the vehicle-mounted terminal communication device for underground parking garages provided in this application; Figure 3 This is a structural schematic diagram of an embodiment of the vehicle provided in this application. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all structures. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] See Figure 1 , Figure 1 This is a flowchart illustrating an embodiment of the vehicle-mounted terminal communication method for underground parking garages provided in this application. The method includes: Step 11: The main control microprocessor reads the current remaining power of the vehicle terminal's backup battery and the current reference signal receiving power of the vehicle terminal's RF baseband processing chip.

[0022] In some embodiments, under the normal operating state of the vehicle communication hardware terminal, the main control microprocessor uses the built-in low-power hardware timer to initiate polling instructions to the underlying physical module according to a preset normal sampling period (e.g., every ten seconds).

[0023] On the one hand, the main control microprocessor directly collects the actual analog voltage of the output terminal of the built-in backup battery through the internal analog-to-digital conversion physical channel and converts it into a digital quantity to characterize the current real remaining energy state of the backup battery.

[0024] On the other hand, the main control microprocessor bypasses the application layer operating system and directly accesses the low-level diagnostic registers of the RF baseband processing chip via the serial peripheral interface bus to read the raw hexadecimal values ​​of the current "reference signal received power" and "channel quality indication parameters". This operation directly extracts the RF energy characterization value before demodulation by the physical layer receiver, completely avoiding the additional computing resources consumed by the parsing of higher-level protocol stacks.

[0025] Step 12: When the current remaining power and the current reference signal receiving power both meet the physical degradation conditions, the main control microprocessor enters the low-level feature simplified broadcast mode, cuts off the power supply circuit of the global satellite positioning radio frequency receiving module and other non-essential environmental sensors, and sends the low-level reset and reconfiguration instructions to the radio frequency baseband processing chip, freezing the currently running connection-oriented long connection network protocol stack.

[0026] In some embodiments, the main control microprocessor constructs a sliding time window; the main control microprocessor performs physical degradation condition judgment on the current remaining power and the current reference signal received power within the sliding time window in real time; when the reference signal received power is lower than the preset extremely weak network fading power threshold for multiple consecutive times within the sliding time window, and when the current remaining power is lower than the preset over-discharge voltage safety threshold, the physical degradation condition is met; the main control microprocessor enters the low-level feature simplified broadcast mode.

[0027] In some embodiments, the comparator logic inside the main microprocessor triggers a high-priority external hardware interrupt pin level to flip, outputting a hardware interrupt signal. After capturing the hardware interrupt signal, the main interrupt controller of the main microprocessor immediately suspends all currently executing regular application layer software threads, pushes the context data of critical registers onto the stack for protection, and forces the system state machine pointer to jump to the preset starting memory address of the low-level feature simplified broadcast mode, entering the low-level feature simplified broadcast mode.

[0028] Step 13: The main control microprocessor reads the current level signals of each actuator and sensor through the underlying bus and maps the current level signals to the current status word.

[0029] In some embodiments, if a status reporting request is triggered by the vehicle's controller area network bus or general-purpose input / output pin, the main control microprocessor reads the current level signals of each actuator and sensor through the underlying bus; the main control microprocessor maps the current level signals to the current status word according to the same bit field mapping rules as the basic status word.

[0030] Step 14: The main control microprocessor writes the current status word and the basic status word into the internal arithmetic logic unit, so that the arithmetic logic unit performs a bitwise XOR operation on the current status word and the basic status word to obtain the differential mask register value.

[0031] Within a single machine instruction cycle, the Arithmetic Logic Unit (ALU) performs a pure hardware Exclusive-OR operation on two eight-byte data sets (the current status word and the base status word). Based on the physical characteristics of XOR gates in digital circuits (same input, output zero; different input, output one): if the physical state of a component remains unchanged (e.g., a car window remains closed), the corresponding bit outputs a logical "zero" after the XOR operation; if the state of a component changes (e.g., a car door changes from unlocked to locked), the corresponding bit will necessarily output a logical "one" after the XOR operation. The output of this operation forms an eight-byte differential mask register value. This low-level hardware logic operation perfectly replaces the computationally intensive text comparison and deduplication processes in higher-level protocols.

[0032] Step 15: The main control microprocessor performs a non-zero detection on the value of the differential mask register. When the detection result is non-zero, it extracts the non-zero byte from the value of the differential mask register and concatenates the actual change value corresponding to the non-zero byte to obtain the differential state payload of a single byte.

[0033] In some embodiments, if the detection result is all zeros, indicating that the physical state of the vehicle has not changed in any substantial way, the main control microprocessor will directly clear the transmission buffer and control the system to continue to sleep, so as to protect the backup battery to the maximum extent (i.e., to achieve absolute silence physical control when there is no effective change).

[0034] If the detection result is non-zero, the main microprocessor uses a hardware shift instruction to scan the differential mask and quickly locates the data block containing the bit with a value of "one". Subsequently, the main microprocessor performs a physical trimming operation: directly discarding (without reading or moving) those redundant bytes whose XOR result is all zero (such as static bytes representing firmware version or constant battery temperature), and extracting only the single byte containing the transition bit.

[0035] Finally, the main control microprocessor reassembles the offset address identifier of the valid byte (e.g., occupying four bits to indicate whether the lock state or the window state has changed) with the actual change value of the byte (occupying four bits). After this low-level physical truncation and reassembly, the originally massive full vehicle status data is precisely compressed into an extremely simple payload of only a single byte in length, laying the foundation for the ultimate data volume for subsequent burst transmission over the air interface in microsecond-level physical noise gaps.

[0036] Step 16: The main control microprocessor wakes up the physical layer measurement mechanism of the RF baseband processing chip through the internal instruction bus, so that the RF baseband processing chip locks the downlink reference signal sent by the serving base station and converts the downlink reference signal into a digital baseband signal.

[0037] In some embodiments, before the main control microprocessor wakes up the physical layer measurement mechanism of the RF baseband processing chip via the internal instruction bus, so that the RF baseband processing chip locks the downlink reference signal sent by the serving base station and converts the downlink reference signal into a digital baseband signal, the process includes: the main control microprocessor detecting the hardware status pin of the global satellite navigation module or the last valid positioning timestamp; the main control microprocessor determining whether it is in a satellite signal blind zone based on the hardware status pin or the last valid positioning timestamp; when it is confirmed that it is currently in a satellite signal blind zone, the main control microprocessor completely destroys the standard structured text frame originally used to assemble the location information in memory, thereby eliminating the occupation of the transmission buffer by invalid location information and blocking the resource consumption of invalid zero-value characters in subsequent air interface transmission.

[0038] Step 17: The main control microprocessor instructs the RF baseband processing chip to perform dimensionality reduction extraction on the digital baseband signal to obtain two bytes of channel physical characteristics.

[0039] In some embodiments, the main control microprocessor instructs the RF baseband processing chip to perform dimensionality reduction extraction on the digital baseband signal, so that the hardware digital signal processing unit of the RF baseband processing chip can lock only the two dominant frequency subcarriers with the strongest signal energy in the digital baseband signal and directly discard their phase information. It can only calculate and extract the signal amplitude fading values ​​of the two subcarriers, and then map the calculated and extracted signal amplitude fading values ​​into hexadecimal physical quantization indicators through a hardware quantizer to obtain the channel physical characteristics. The channel physical characteristics are then stored in the diagnostic register of the RF baseband processing chip; the main control microprocessor reads the channel physical characteristics from the diagnostic register.

[0040] Step 18: The main control microprocessor concatenates the differential state payload and the channel physical characteristics to obtain a three-byte physical payload.

[0041] In some embodiments, the main control microprocessor extracts two bytes of "channel physical characteristics" as a unique "physical space proxy tag" for a specific parking space in the underground garage.

[0042] Subsequently, the main control microprocessor directly appends the two-byte proxy tag to the differential state payload in the static random access memory.

[0043] By forcibly replacing and splicing the aforementioned underlying hardware data, the vehicle-mounted terminal not only avoids sending lengthy and invalid satellite positioning text, but also cleverly transfers the complex positioning calculation burden to a remote server (after receiving this extremely concise message, the remote server can roughly compare the vehicle's underground location by consulting the historically accumulated channel multipath amplitude feature database). Ultimately, an ultra-miniature physical payload with a total length of only three bytes is formed on the terminal side, clearing the final data volume obstacle for subsequent instantaneous burst broadcasts in extremely noisy environments.

[0044] Step 19: The main microprocessor uses the physical payload as the offset of the memory address to access the static mapping lookup table in the non-volatile read-only memory to obtain the corresponding overlay sequence code bit stream.

[0045] In some embodiments, the static mapping lookup table includes cyclic overlay sequence codes generated by exhaustive computation; the geometric characteristic of the cyclic overlay sequence codes is that any two different three-byte data sequences map to a bit sequence that maintains a maximized physical Hamming distance.

[0046] Step 20: The main control microprocessor sends the overlay sequence code bit stream to the RF baseband processing chip, so that the RF baseband processing chip can send out the overlay sequence code bit stream.

[0047] In some embodiments, the main control microprocessor sends the overlay sequence code bitstream to the transmit buffer register of the RF baseband processing chip, so that the RF baseband processing chip adds the most basic Media Access Control layer hardware addressing header and the Cyclic Redundancy Check tail for verifying integrity to the overlay sequence code bitstream, encapsulating the overlay sequence code bitstream into a physical broadcast raw data frame; after receiving the transmit trigger command, the RF baseband processing chip first controls the RF receiving front end to perform channel noise floor energy sensing; the analog-to-digital converter of the RF baseband processing chip collects the level values ​​of background thermal noise and impulse interference in the current frequency band; when the level values ​​of background thermal noise and impulse interference sampled for several consecutive times are lower than the set interference blocking threshold; the control logic inside the RF baseband processing chip instantly pulls up the level of the power control pin to supply power to the RF power amplifier; at the instant the RF power amplifier starts, the physical broadcast raw data frame is ejected into the air in the form of electromagnetic waves within two milliseconds, and a few microseconds after the transmission is completed, the RF baseband processing chip immediately cuts off the power supply to the RF power amplifier and puts the entire communication module of the RF baseband processing chip into a deep sleep power-off state through the hardware reset pin.

[0048] The above method solves the problem that long messages take too long to transmit in the air, making them prone to failure in the event of sudden noise, and causing the terminal's backup battery to be quickly depleted due to frequent retries.

[0049] See Figure 2 , Figure 2 This is a schematic diagram of an embodiment of the vehicle-mounted terminal communication device for underground parking garages provided in this application. The vehicle-mounted terminal communication device 500 for underground parking garages includes a main control microprocessor 501, a radio frequency baseband processing chip 502, and a memory 503. The main control microprocessor 501 is connected to both the radio frequency baseband processing chip 502 and the memory 503. The memory 503 stores a computer program. The main control microprocessor 501 is used to call the computer program to implement the following methods: The main control microprocessor reads the current remaining power of the vehicle terminal's backup battery and the current reference signal receiving power of the vehicle terminal's RF baseband processing chip. When both the current remaining power and the current reference signal receiving power meet the physical degradation conditions, the main control microprocessor enters the low-level characteristic simplified broadcast mode, cutting off the power supply circuits of the global satellite positioning RF receiver module and other non-essential environmental sensors, and sending low-level reset and reconfiguration commands to the RF baseband processing chip, freezing the currently running connection-oriented long-connection network protocol stack. The main control microprocessor reads the current level signals of each actuator and sensor through the low-level bus and maps the current level signals to the current status word. The main control microprocessor writes the current status word and the basic status word into the internal arithmetic logic unit, so that the arithmetic logic unit performs a bitwise XOR operation on the current status word and the basic status word to obtain the differential mask register value. The main control microprocessor performs a non-zero detection on the differential mask register value, and when the detection result is non-zero, it starts from... The differential mask register value extracts non-zero bytes, and the corresponding actual change values ​​of the non-zero bytes are concatenated to obtain a single-byte differential state payload. The main microprocessor, through its internal instruction bus, wakes up the physical layer measurement mechanism of the RF baseband processing chip, enabling the RF baseband processing chip to lock onto the downlink reference signal sent by the serving base station and convert the downlink reference signal into a digital baseband signal. The main microprocessor instructs the RF baseband processing chip to perform dimensionality reduction extraction on the digital baseband signal, obtaining two bytes of channel physical characteristics. The main microprocessor concatenates the differential state payload and the channel physical characteristics to obtain a three-byte physical payload. The main microprocessor uses the physical payload as an offset in the memory address to access the static mapping lookup table in the non-volatile read-only memory to obtain the corresponding overlay sequence code bitstream. The main microprocessor sends the overlay sequence code bitstream to the RF baseband processing chip, enabling the RF baseband processing chip to transmit the overlay sequence code bitstream.

[0050] In some embodiments, the main control microprocessor 501 is also used to call a computer program to implement the method of any embodiment of this application.

[0051] See Figure 3 , Figure 3This is a structural schematic diagram of an embodiment of the vehicle provided in this application. The vehicle 600 includes an underground parking garage vehicle-mounted terminal communication device 500.

[0052] In some embodiments, this application abandons the conventional approach of increasing the number of retries at the application layer, and instead delves into the communication physical layer and data link layer to provide a simplified coding communication method based on low-level hardware logic operations, forcibly compressing the air interface transmission time from tens of milliseconds to two to three milliseconds. Specifically, it includes the following main steps: Step 1: Environment awareness and protocol stack blocking based on hardware thresholds.

[0053] Step 2: Bitwise XOR differential and redundancy truncation based on static memory.

[0054] Step 3: Dimensional reduction and substitution of satellite positioning data using physical layer channel characteristics.

[0055] Step 4: Read-only memory lookup table mapping and microsecond-level burst transmission within the noise gap.

[0056] In some embodiments, the content of step one: environment awareness and protocol stack blocking based on hardware thresholds is described as follows: The core objective of this step is to accurately identify the physical scenario of a vehicle entering an underground parking garage and facing battery depletion through a low-computational-power-overhead underlying hardware polling mechanism, and then forcibly take over system control via hardware-level interrupts to cut off all unnecessary power-consuming processes. Specifically, it includes the following sub-steps: Sub-step 101: Low-power joint polling of physical environment and energy state.

[0057] In the normal operating state of the vehicle communication hardware terminal, the main control microprocessor uses the built-in low-power hardware timer to initiate polling instructions to the underlying physical module according to the preset normal sampling period (e.g., every ten seconds).

[0058] On the one hand, the main control microprocessor directly collects the actual analog voltage of the output terminal of the built-in backup battery through the internal analog-to-digital conversion physical channel and converts it into a digital quantity to characterize the current real remaining energy state of the backup battery. On the other hand, the main control microprocessor bypasses the application layer operating system and directly accesses the low-level diagnostic registers of the RF baseband processing chip via the serial peripheral interface bus to read the raw hexadecimal values ​​of the current "reference signal received power" and "channel quality indication parameters". This operation directly extracts the RF energy characterization value before demodulation by the physical layer receiver, completely avoiding the additional computing resources consumed by the parsing of higher-level protocol stacks.

[0059] Sub-step 102: Hard threshold anti-disturbance determination based on sliding time window.

[0060] To prevent vehicles from misjudging the environment due to short-term obstructions (such as passing through short tunnels or under viaducts) while driving, the main control microprocessor internally constructs a fixed-length sliding time window based on static random access memory (e.g., a data queue containing five consecutive sampling periods).

[0061] The main control microprocessor performs hardware-level comparison logic operations on the data within the sliding window in real time. Only when the following stringent "double physical degradation conditions" are met is the system considered truly trapped in the underground parking garage's extreme environment: First condition: If the value of the "reference signal received power" is lower than the "extremely weak network fading power threshold" (e.g., the register threshold value corresponding to negative 110 decibels milliwatts) in the pre-frozen read-only memory, it indicates that the radio electromagnetic waves have been deeply shielded by thick concrete. The second condition is that the current backup battery voltage is lower than the preset "over-discharge voltage safety threshold" (e.g., the calibrated voltage value representing less than 20% of the battery's remaining capacity), indicating that the terminal has lost its physical ability to continuously transmit high-power radio frequency signals.

[0062] Sub-step 103: Hardware-level exception interrupt triggering and state machine jump transition.

[0063] When the result of the above logical AND operation based on the sliding time window is true, the comparator logic inside the main microprocessor will directly trigger a high-priority external hardware interrupt pin level to flip (from low level to high level).

[0064] After the main interrupt controller of the main microprocessor captures the hardware interrupt signal, it immediately suspends all currently executing regular application layer software threads, pushes the field data of the critical registers onto the stack for protection, and forces the system state machine pointer to jump to the preset starting memory address of the "low-level feature minimalist broadcast mode", thereby completing the instantaneous switch from regular network communication to extreme survival mode.

[0065] Sub-step 104: Peripheral hardware cascading blocking and deep stripping of the protocol stack.

[0066] Upon entering the "low-level feature-simplified broadcast mode," the main control microprocessor immediately executes a series of forced blocking operations designed to minimize power consumption and release physical channel resources: First, the main control microprocessor directly cuts off the power supply to the global satellite positioning RF receiver module and other non-essential environmental sensors on the hardware circuit by pulling the level of the General Purpose Input / Output (GPIO) control pin low. Since the satellite RF signal in the underground parking garage environment has completely attenuated to below the noise floor, this physical power-off operation completely eliminates the huge unnecessary current consumption caused by the module's ineffective satellite search.

[0067] Subsequently, the main control microprocessor sends a low-level reset and reconfiguration command to the RF baseband processing chip, forcibly freezing (suspending) the currently running connection-oriented long-connection network protocol stack (such as the traditional transmission control protocol stack). At the same time, at the hardware control level, the transmit buffer queue originally used to support the automatic retransmission request mechanism of this protocol is cleared.

[0068] Through the above stripping operation, the vehicle terminal not only broke the "deadlock loop" caused by the continuous full load and heat generation of the RF power amplifier due to the failure of long message transmission, but also completely cleared the underlying physical transmission channel, reserving sufficient peak instantaneous current and clean memory swap space for subsequent critical differential state burst transmission based on ultra-short pulse broadcast technology.

[0069] In some embodiments, step two: bitwise XOR differential and redundancy truncation based on static memory is described as follows: The core objective of this step is to completely abandon the cumbersome key-value pair text (such as JSON format) concatenation method used in traditional IoT applications. Instead, it uses low-level microprocessor arithmetic logic operations to accurately capture the "physical state changes" of vehicles in blind spots (i.e., the core semantics in communications), and directly physically removes all unchanged redundant data at the memory level. Specifically, it includes the following sub-steps: Sub-step 201: Underlying storage and alignment of the baseline physical state snapshot.

[0070] When the vehicle is in normal operation and the network signal is good, the main control microprocessor of the vehicle terminal will allocate a fixed-length contiguous memory address space (e.g., a physical length of eight bytes) in its built-in static random-access memory (SRAM).

[0071] This memory space is used to maintain a "basic status word" in real time. This status word records a snapshot of the vehicle's physical state at the moment it last successfully sent and received an acknowledgment (ACK) from the base station, using strict bit-field mapping. For example, the zeroth bit of the zeroth byte represents the door lock motor status, and the first bit represents the window lift relay status; the remaining bytes map to the voltage range levels of the battery management system (BMS), etc. This "basic status word" represents the final known state of the vehicle currently held by the cloud server.

[0072] Sub-step 202: Hardware-level acquisition and assembly of the current physical state within the blind zone.

[0073] When the vehicle terminal switches to "low-level feature simplified broadcast mode" in step one, if the vehicle's Controller Area Network (CAN) bus or General Purpose Input / Output (GPIO) pin triggers a status reporting request (e.g., the user presses the physical lock button in the underground garage), the main control microprocessor immediately reads the current level signals of each actuator and sensor through the low-level bus.

[0074] The main control microprocessor will collect the latest hardware level status and, according to the same bit-field mapping rules as sub-step 201, assemble it in the static random access memory to generate a "current status word" of the same length as the previous one, a "current status word". At this time, the data acquisition and assembly are strictly limited to bit-level hardware mapping and do not include any text character conversion or encapsulation.

[0075] Sub-step 203: Pure hardware bitwise XOR extraction based on arithmetic logic units.

[0076] To accurately extract valid information about mutations, the main control microprocessor simultaneously pushes the "basic status word" and "current status word" from the static random access memory into the internal arithmetic logic unit (ALU).

[0077] Within a single machine instruction cycle, the arithmetic logic unit performs a pure hardware "exclusive-OR" logical operation on the two eight-byte data sets. Based on the physical characteristics of XOR gate operations in digital circuits (same input, output zero; different input, output one): if the physical state of a component remains unchanged (e.g., a car window remains closed), the corresponding bit outputs a logical "zero" after the XOR operation; if the state of a component changes (e.g., a car door changes from unlocked to locked), the corresponding bit will necessarily output a logical "one" after the XOR operation.

[0078] The output of this operation forms an eight-byte "differential mask register value". This low-level hardware logic operation perfectly replaces the computationally intensive text comparison and deduplication process in higher-level protocols.

[0079] Sub-step 204: Zero-value byte stripping and minimal payload generation based on hardware mask.

[0080] The main control microprocessor performs hardware-level non-zero detection on the generated "differential mask register value".

[0081] If the detection result is all zeros, it indicates that the physical state of the vehicle has not changed in any substantial way. The main control microprocessor will directly clear the transmission cache and control the system to continue to sleep, so as to protect the backup battery to the maximum extent (that is, to achieve absolute silence physical control when there is no effective change).

[0082] If the detection result is non-zero, the main microprocessor uses a hardware shift instruction to scan the differential mask and quickly locates the data block containing the bit with a value of "one". Subsequently, the main microprocessor performs a physical trimming operation: directly discarding (without reading or moving) those redundant bytes whose XOR result is all zero (such as static bytes representing firmware version or constant battery temperature), and extracting only the single byte containing the transition bit.

[0083] Finally, the main control microprocessor reassembles the offset address identifier of the valid byte (e.g., occupying four bits to indicate whether the lock state or the window state has changed) with the actual change value of the byte (occupying four bits). After this low-level physical truncation and reassembly, the originally massive full vehicle status data is precisely compressed into an extremely simple payload of only a single byte in length, laying the foundation for the ultimate data volume for subsequent burst transmission over the air interface in microsecond-level physical noise gaps.

[0084] In some embodiments, the content of step three: dimensionality reduction and substitution of satellite positioning data by physical layer channel features is described as follows: The core objective of this step is to address the problem of complete loss of global satellite navigation signals after a vehicle enters an underground parking garage, resulting in the generation of tens of bytes of invalid blank characters (such as empty latitude and longitude text in the NMEA protocol) in conventional positioning messages, thus severely wasting air interface transmission resources. This invention achieves extreme compression of positioning data by directly extracting the electromagnetic multipath fading characteristic values ​​of the physical layer of the wireless cellular network as a physical proxy for location. Specifically, it includes the following sub-steps: Sub-step 301: Satellite positioning blind spot confirmation and redundant coordinate format removal.

[0085] After the microcontroller switches to the "low-level feature simplified broadcast mode", the main microprocessor first checks the hardware status pins of the global satellite navigation module or the last valid positioning timestamp. When it is confirmed that the current location is in a satellite signal dead zone (unable to calculate valid latitude and longitude coordinates), the microcontroller completely destroys the standard structured text frame originally used to assemble location information in memory (such as discarding the geographic location data packet structure containing comma separators).

[0086] This physical destruction operation completely eliminates the occupation of the transmission buffer by invalid location information, and blocks the resource consumption of invalid zero-value characters in subsequent air interface transmissions.

[0087] Sub-step 302: Low-level detection and acquisition of physical layer downlink reference signals.

[0088] In order to obtain the "physical space fingerprint" of the current parking location of the vehicle in the underground garage, the main control microprocessor wakes up the physical layer measurement mechanism of the radio frequency baseband processing chip through the internal instruction bus.

[0089] Within an extremely short microsecond-level reception window, the RF baseband processing chip locks onto the common reference signal (such as the downlink cell-specific reference signal in LTE or NB-IoT protocols) transmitted by the serving base station. Because underground parking garages are filled with concrete pillars and metal pipes, this downlink reference signal inevitably undergoes severe and unique electromagnetic wave refraction, reflection, and scattering before reaching the vehicle-mounted antenna. At this point, the analog-to-digital converter inside the RF baseband converts the received analog electromagnetic waveform, superimposed with spatial multipath effects, into a discrete digital baseband signal.

[0090] Sub-step 303: Hardware-level quantization and dimensionality reduction truncation of channel state amplitude.

[0091] After acquiring the digital baseband signal, in order to avoid the high computing power and memory overhead caused by processing the massive full channel state information matrix, the main control microprocessor instructs the RF baseband processing chip to perform an extremely lightweight dimensionality reduction extraction operation.

[0092] The hardware digital signal processing unit of the RF baseband processing chip locks onto only the two dominant frequency subcarriers with the strongest signal energy within the current channel bandwidth, directly discarding their complex phase information and only calculating and extracting the signal amplitude fading values ​​of these two subcarriers. Subsequently, these two analog amplitude values ​​are mapped to hexadecimal physical quantization indicators through a hardware quantizer and stored in a specific diagnostic register of the RF baseband.

[0093] The main control microprocessor directly reads the diagnostic register, obtains the amplitude value that characterizes the current spatial multipath reflection features, and strictly truncates and limits it to two bytes of fixed-length binary data.

[0094] Sub-step 304: Low-level splicing of channel physical characteristics and differential state.

[0095] The main control microprocessor uses the two bytes of "channel state amplitude characteristic value" extracted in sub-step 303 as a unique "physical space proxy tag" for a specific parking space in the underground garage.

[0096] Subsequently, the microcontroller directly appends the two-byte proxy tag to the one-byte "differential state payload" generated in step two in the static random access memory.

[0097] By forcibly replacing and splicing the aforementioned underlying hardware data, the vehicle-mounted terminal not only avoids sending lengthy and invalid satellite positioning text, but also cleverly transfers the complex positioning calculation burden to a remote server (after receiving this extremely concise message, the remote server can roughly compare the vehicle's underground location by consulting the historically accumulated channel multipath amplitude feature database). Ultimately, an ultra-miniature physical payload with a total length of only three bytes is formed on the terminal side, clearing the final data volume obstacle for subsequent instantaneous burst broadcasts in extremely noisy environments.

[0098] In some embodiments, the content of step four: read-only memory lookup table mapping and microsecond-level burst transmission within the noise gap is described as follows: The core objective of this step is to completely abandon the complex forward error correction coding mechanism used in traditional cellular communication for long messages. For the ultra-miniature physical payload of only three bytes remaining after compression in the previous steps, a hardware lookup table method with extremely low computational overhead is used to map it into a highly fault-tolerant physical sequence. Simultaneously, utilizing the extremely short airtime of this sequence, instantaneous burst transmission is achieved within the complex electromagnetic noise of an underground parking garage, thus achieving a fundamental breakthrough in transmission success rate. Specifically, it includes the following sub-steps: Sub-step 401: Avoid non-volatile memory addressing table lookup for complex error correction algorithms.

[0099] In conventional communication designs, to prevent data corruption by noise from underground parking garages, microprocessors typically run complex convolutional codes or low-density parity-check codes for encoding. However, for a minimal payload of only three bytes, such algorithms not only generate significant tail redundancy but also unnecessarily consume the meager amount of backup battery power.

[0100] This invention employs a physical-level dimensionality reduction scheme that trades storage space for computation time. The main control microprocessor directly uses the three-byte payload generated in step three as the offset of the memory address to access a static mapping lookup table pre-burned into the terminal's built-in non-volatile read-only memory (Flash ROM). This table lookup operation can be completed within the microcontroller in only one to two machine instruction cycles, achieving a completely "zero-computational-power-consumption" encoding conversion.

[0101] Sub-step 402: Physical mapping of cyclic overlay sequence codes to resist burst noise.

[0102] The data fixed in the static mapping table above is not ordinary binary data, but a "cyclic overlay sequence code" generated by exhaustive calculation before leaving the factory.

[0103] The physical geometric characteristic of this sequence code is that any two different three-byte data sequences maintain a maximum physical Hamming distance (i.e., the two waveform sequences have maximum dissimilarity at the bit level). The main control microprocessor directly extracts the corresponding overlay sequence code bitstream by looking up a table. Even if the bitstream is subjected to strong burst pulse interference during its propagation in an underground parking garage, causing some bits to undergo physical level flips (such as changing from zero to one), the remote receiving base station can still use the inherent maximum Hamming distance geometry of this sequence code to forcibly correct the errors and restore it to the original three bytes through the underlying hard decision mechanism, greatly improving the distortion resistance under poor channel conditions.

[0104] Sub-step 403: Strip the underlying raw data frame encapsulation of the network layer handshake protocol.

[0105] To further reduce over-the-air transmission time, the main microprocessor refuses to encapsulate it in the conventional Transmission Control Protocol (TCP) or the session layer that establishes long-lived connections.

[0106] The microprocessor directly pushes the overlay sequence code bitstream obtained from the lookup table into the transmit buffer register of the RF baseband processing chip. Inside the RF baseband, the most basic Media Access Control (MAC) layer hardware addressing header and the Cyclic Redundancy Check (CRC) tail for verifying integrity are directly added to it, encapsulating it into a lowest-level, connectionless physical broadcast raw data frame.

[0107] After this extreme compression and encapsulation, the physical size of the entire data frame is strictly limited, and the "airborne physical occupancy time" required for the radio frequency transmitter to fully turn on and complete modulation and transmission is constantly locked within an extremely narrow range of 1.5 to 3 milliseconds.

[0108] Sub-step 404: Microsecond-level burst emission based on physical noise floor detection.

[0109] In the underground parking garage environment, although the background noise is severe and multipath reflection interference is frequently generated, the energy distribution of the noise still has random "troughs" (i.e. instantaneous silence gaps) on the microsecond time axis.

[0110] Upon receiving a transmit trigger command, the RF baseband processing chip does not immediately power on the RF power amplifier (PA). Instead, the baseband chip first controls the RF receiving front end to perform a "channel noise floor energy sensing" (i.e., idle channel assessment) lasting on the order of hundreds of microseconds.

[0111] The analog-to-digital converter in the RF baseband rapidly acquires the levels of background thermal noise and pulse interference in the current frequency band. When the ambient noise level is lower than the set interference blocking threshold after several consecutive samplings, that is, when the "microsecond-level silent trough" of electromagnetic noise in the underground parking garage is accurately captured, the control logic inside the RF baseband instantly pulls up the level of the power control pin to supply power to the RF power amplifier.

[0112] At the instant the power amplifier is activated, the aforementioned physical broadcast raw data frame is ejected into the air as electromagnetic waves within two milliseconds with extremely high burst power. A few microseconds after the transmission is completed, the baseband chip immediately cuts off the power amplifier's power supply and puts the entire communication module into a deep sleep power-off state through a hardware reset pin, completing a perfect "seize the opportunity" ultra-low power burst communication.

[0113] In summary, this application has the following technical effects: An exponential leap in physical layer collision avoidance and transmission success rate: This application breaks away from the conventional engineering mindset of "retransmission is mandatory in weak networks." Through "XOR differential + channel feature substitution + lookup table mapping," the data packet length is rigidly compressed from 150 bytes to two to four bytes, reducing the physical layer's airborne transmission time from 50 milliseconds to approximately 2 milliseconds. In the complex electromagnetic environment of an underground parking garage, a data packet that can be transmitted in just "two milliseconds" can precisely survive in the silent gaps of random noise, increasing its probability of not being hit by noise by nearly two orders of magnitude compared to long messages. At the edge of extremely weak signals, the one-time transmission success rate has achieved a fundamental leap from less than 5% to over 90%.

[0114] Ending the deadlock power consumption trap and doubling the physical battery life: Because this application blocks lengthy protocol handshakes and invalid long message retransmission cycles, the energy consumption mode of the vehicle terminal changes from "continuous high current full-load heating of the RF power amplifier for tens of seconds" to "single extremely narrow pulse discharge of a few milliseconds". This change in the underlying hardware operation mode completely avoids the phenomenon of battery "deadlock and draining" caused by repeated network attempts in the basement, and extends the backup battery's maintenance time in the same harsh environment from less than three hours to more than seventy-two hours, ensuring the background can continuously monitor vehicles parked in the garage for several days.

[0115] Zero-additional-hardware-cost regional blind-zone location awareness: This application cleverly utilizes the two-byte "channel state amplitude characteristic value" built into the underlying communication layer to directly replace the massive satellite positioning data that becomes invalid due to signal loss. This allows the terminal to transfer the positioning calculation burden to the cloud (the cloud can roughly match the vehicle parking area by using the historical channel feature database) without adding any additional indoor positioning sensors or engaging in complex downlink positioning interactions with the base station. While maximizing packet compression, it still maintains the physical awareness of the vehicle's parking location.

[0116] Furthermore, the macro and micro aspects of this application are described below: I. Macro level: A tight logical loop between the four core steps.

[0117] These four steps work together to serve the extreme physical scenario of "extremely weak network + impending power outage". The macroscopic logical relationship is: "condition triggering and resource clearance" → "extreme compression of time dimension" → "extreme compression of space dimension" → "zero computing power fault tolerance and instantaneous physical burst".

[0118] Step one (environmental perception and blocking) is the premise of the whole solution's "physical gating and resource debinding".

[0119] Logical constraint: Without the hard threshold-based interrupt and protocol stack forced blocking in step one, the vehicle terminal would continuously consume the high current of the RF power amplifier for TCP handshake retransmissions under the normal mechanism. Step one, by cutting off normal communication, not only stops the power consumption but, more importantly, releases the microprocessor's control and the underlying air interface transmission channel, clearing the way for subsequent steps to take over the underlying hardware.

[0120] Step 2 (differential truncation) and Step 3 (channel feature substitution) are the "absolute physical prerequisites" for Step 4 (microsecond burst) to be valid.

[0121] Logical Constraint: The core success factor for step four lies in the "extremely short over-the-air transmission time (1.5 to 3 milliseconds)," allowing it to be wedged into noise gaps. To achieve such a short transmission time, the data packets must be compressed to the limit (within three bytes).

[0122] The steps work in tandem: Step 2 removes redundancy in the time dimension (eliminating unchanged vehicle states); Step 3 removes redundancy in the spatial dimension (replacing tens of bytes of invalid satellite positioning text with two bytes of physical layer fading features). Only when these two steps work together to completely destroy the original application layer message structure can the payload volume be physically reduced to the allowable range of hardware lookup table encoding (Step 4).

[0123] Step four (table lookup mapping and listening to transmission) is the "ultimate physical realization" of the first three steps.

[0124] Logical constraints: The power saved and the extremely small data volume achieved in the first three steps are all for the purpose of "squeezing in" in the poor channel conditions of step four. Because steps two and three compress the data to three bytes, step four can abandon the high-power error correction algorithm and use "zero-computing-power" lookup table mapping (Flash ROM addressing). It is precisely because of the high-fault-tolerant overlay sequence code of lookup table mapping that it can be combined with the low-noise listening mechanism to complete the highly reliable physical layer broadcast in the instant of radio frequency activation in a few microseconds, forming the final closed loop.

[0125] II. Micro level: The physical connection between sub-steps within each step.

[0126] 1. The progressive logic within Step One: from "perception" to "cutting off".

[0127] 101 (Low-power polling) → 102 (Hard threshold determination): Sub-step 101 directly extracts the raw level data from the hardware register, ensuring the low-level nature of the data and low power consumption. These purest physical quantities directly serve as the input source for the sliding window comparator in sub-step 102.

[0128] 102 (Hard threshold determination) → 103 (Hardware interrupt): Sub-step 102 filters out occasional signal jitter through "dual physical degradation conditions (low signal + low level)". Once the result of its logical AND operation is true, it becomes the only legal and absolute physical trigger source that triggers the hardware interrupt pin level to flip in sub-step 103.

[0129] 103 (Hardware Interrupt) → 104 (Cascaded Block): Sub-step 103 seizes the highest control of the system and forcibly changes the program counter pointer. This seizure of control is a prerequisite for sub-step 104 to bypass the operating system security mechanism, directly pull the pin level low to cut off the power supply to the peripheral device, and forcibly suspend the higher-level protocol stack.

[0130] 2. The progressive logic within step two: from "alignment" to "cropping".

[0131] 201 (Base Snapshot) + 202 (Current Snapshot) → 203 (Hardware XOR): Sub-step 201 anchors the historical baseline in memory, and sub-step 202 assembles the current state in memory. These two segments of memory data, strictly aligned in bit field mapping, are the necessary input operands for the Arithmetic Logic Unit (ALU) in sub-step 203 to execute the "bitwise XOR" underlying machine instruction.

[0132] 203 (Hardware XOR) → 204 (Mask Stripping): The XOR result of sub-step 203 (i.e., the physical marker of which bits have changed) directly generates the "differential mask" required by sub-step 204. Sub-step 204 relies entirely on this mask, using hardware bitwise AND operations to precisely locate and physically remove redundant bytes whose XOR result is zero.

[0133] 3. The progressive logic within step three: from "destruction" to "reconstruction".

[0134] 301 (Blind Spot Confirmation) → 302 (Capture Downlink Pilot): Sub-step 301 confirms that the old text positioning architecture is no longer valuable and destroys it by detecting the hardware status. This triggers the microprocessor to send an instruction to the RF baseband, prompting the baseband to actively capture the downlink common reference signal waveform required by the alternative solution in sub-step 302.

[0135] 302 (Capture Downlink Pilot) → 303 (Amplitude Quantization and Dimensionality Reduction): Sub-step 302 captures a massive raw baseband waveform containing the entire frequency band and complex phases. To meet the final requirement of extremely short transmission, the waveform must pass through a hardware filter and quantizer in sub-step 303 to forcibly filter out phase information, extracting only the amplitude value of the strongest subcarrier and compressing it to two bytes, thus completing the dimensionality reduction.

[0136] 303 (Amplitude Quantization Dimension Reduction) → 304 (Bottom-Level Concatenation): The two-byte quantization feature output from sub-step 303 and the one-byte state feature output from step two are physically concatenated in the memory address space of sub-step 304 to synthesize the final unique three-byte physical payload that needs to be sent.

[0137] 4. The progressive logic within step four: from "zero computing power coding" to "physical burst".

[0138] 401 (Memory Addressing) → 402 (Extract Overlay Sequence): Sub-step 401 directly converts the three-byte payload synthesized in the preceding steps into a physical level (i.e., a memory address pointer) on the microprocessor address bus. This address pointer points to a specific physical address in the read-only memory, allowing the highly interference-resistant "cyclic overlay sequence code" embedded at that address to be directly read out in sub-step 402 (table lookup complete).

[0139] 402 (Extract Overlay Sequence) → 403 (Raw Data Frame Encapsulation): The security immunity sequence read in sub-step 402 is the only payload in the encapsulation process of sub-step 403. Sub-step 403 only adds the necessary low-level addressing headers and footers, resolutely refusing to add any high-level routing protocols, ensuring that the frame structure is extremely compact.

[0140] 403 (Raw Data Frame Encapsulation) → 404 (Noise Floor Listening and Transmission): The strictly limited physical length of the data frame in sub-step 403 directly determines the required turn-on time of the RF transmitter in sub-step 404 (only two milliseconds). It is precisely because this "two milliseconds" turn-on time is extremely short that the "noise floor listening" mechanism in sub-step 404 can, with 100% certainty, transmit this extremely short data frame completely and without interference when a fleeting microsecond-level channel silence trough is detected.

[0141] The following are illustrative examples of embodiments related to this application: Example 1: Security reporting scenario of user leaving and locking car in garage.

[0142] This embodiment addresses the engineering coordination problem that arises when a user locks their car in a three-story underground parking garage with weak signal, and the "lock status" must be successfully reported when leaving, but the terminal's backup battery is weak and the satellite signal is lost.

[0143] Step 1: Hardware-level environmental awareness and mode switching coordination.

[0144] When a user presses the physical key or their mobile phone approaches to trigger the door lock motor, the door locking detection mechanism (such as a Hall sensor) outputs a high-level change, waking the main control microprocessor. The main control microprocessor reads the backup battery's analog-to-digital conversion channel value through its internal timer and finds that the battery voltage is at the over-discharge voltage safety threshold (corresponding to only 10% charge remaining). Simultaneously, it reads the baseband chip's signal register through the serial peripheral interface bus and confirms that the reference signal received power is -112 dBmW (below the -110 dBmW threshold). With both conditions met, the main control microprocessor triggers an external hardware interrupt, directly cutting off the power supply to the low-dropout linear regulator of the global satellite positioning RF receiver module, suspending the connection-oriented complex long-connection protocol stack, and completing hardware-level resource clearance.

[0145] Step 2: Collaboration of XOR differential and redundancy truncation based on static memory.

[0146] The main microprocessor retrieves an eight-byte "historical locking baseline status word" from static random access memory (at this point, the zeroth bit of the zeroth byte is "zero," indicating unlocked). The microprocessor then pushes the newly acquired "current status word" (the zeroth bit is "one," indicating locked) into the arithmetic logic unit to perform a bitwise XOR operation. The result is output as a "differential mask," showing that only the zeroth bit of the zeroth byte is "one" (indicating a state transition), while all other bits are "zero." The microprocessor directly controls the data bus to extract only the single byte that has changed, physically discarding and truncating the remaining seven unchanged bytes, thus compressing the data payload to a single byte.

[0147] Step 3: Dimensional reduction and substitution of satellite positioning data based on physical layer channel characteristics.

[0148] Since the satellite positioning module was physically disconnected in step one, the main control microprocessor no longer reads satellite positioning data. The RF baseband processing chip directly captures the downlink pilot reference signal of the current serving cell, and its hardware digital signal processing unit calculates the channel state amplitude fading value of the two main pilot subcarriers, quantizing this value into a two-byte hexadecimal "channel spatial feature fingerprint". The main control microprocessor directly concatenates this two-byte feature fingerprint after the single-byte locking differential payload compressed in step two, forming a total of three bytes of miniaturized positioning-state hybrid payload.

[0149] Step 4: Coordination between read-only memory lookup mapping and microsecond-level burst transmission within noise gaps.

[0150] The main control microprocessor uses the aforementioned three-byte payload as an address offset to directly read the mapping table embedded in the non-volatile read-only memory, instantly obtaining the corresponding "cyclic overlay sequence code" with the maximum Hamming distance feature. The baseband chip encapsulates this sequence into a physical layer raw data broadcast frame. Before initiating transmission, the RF front-end performs a 100-microsecond channel energy detection. When it detects a microsecond-level silent trough in the garage background electromagnetic noise, the baseband chip instantly pulls up the control pin, activates the RF power amplifier, completes a burst transmission within an extremely short air interface time of 1.8 milliseconds, and immediately cuts off the power amplifier's power supply. The base station receives the data, and the cloud server uses the two-byte "channel spatial feature fingerprint" to reverse-engineer the vehicle's specific parking space, completing the high-speed, low-power vehicle locking status and location reporting under satellite signal-free conditions.

[0151] Example 2: Alarm scenario for forced towing / illegal displacement in underground parking garage.

[0152] This embodiment addresses the coordination issue of a three-axis accelerometer triggering an alarm when a vehicle is forcibly towed in a blind spot, requiring the use of the last remaining battery power to send an "illegal displacement" alarm within a very short time.

[0153] Step 1: Hardware-level environmental awareness and mode switching coordination.

[0154] When the vehicle is stationary, the three-axis accelerometer detects an abnormal change in the vehicle's tilt angle exceeding a set threshold and sends a hardware interrupt signal to the main control microprocessor. The main control microprocessor is awakened and immediately begins scanning the RF baseband registers, confirming that the reference signal received power is -115 dB / mW (in an extremely weak signal blind zone). The main control microprocessor determines that the physical conditions for maintaining a long-term communication connection are not currently met, cascades the trigger pin control level, directly shuts off the power supply to the vehicle positioning module and Bluetooth antenna module, forcibly suspends the transmission control protocol stack, and completely transfers system scheduling control to the simplified physical broadcast program.

[0155] Step 2: Collaboration of XOR differential and redundancy truncation based on static memory.

[0156] The main control microprocessor reads an eight-byte basic vehicle status word from static random access memory and performs a bitwise XOR operation with the current status word, which contains abnormal jump parameters from the acceleration sensor. The differential mask output of the logical XOR gate indicates that only specific bits representing the "anti-theft alarm status" are flipped to "one". The main control microprocessor directly executes a memory truncation instruction, discarding unchanged information such as battery level and door status, and extracts only the single byte with the alarm flag into the transmission buffer.

[0157] Step 3: Dimensional reduction and substitution of satellite positioning data based on physical layer channel characteristics.

[0158] In the absence of satellite positioning coordinates, the RF baseband processing chip captures the downlink specific physical layer reference signal transmitted by the current wireless cellular base station, calculates the electromagnetic wave fading amplitude values ​​of the two strongest multipath reflection subcarriers, and quantizes them to generate a two-byte channel feature fingerprint (representing the vehicle's current physical location). The main control microprocessor seamlessly splices this two-byte fingerprint into the single-byte alarm payload refined in step two, and reconstructs it into a three-byte hybrid communication data packet.

[0159] Step 4: Coordination between read-only memory lookup mapping and microsecond-level burst transmission within noise gaps.

[0160] The main control microprocessor uses the three-byte mixed packet as a physical memory address pointer to directly address the lookup table in the read-only memory and read the cyclic overlay sequence code resistant to sudden interference. The baseband chip directly modulates this into a connectionless physical layer broadcast raw data frame. During the physical layer idle channel assessment, the RF baseband quickly detects intermittent troughs in the background electromagnetic noise of the parking garage. The baseband chip instantly releases a trigger signal, enabling the RF power amplifier to complete the burst broadcast transmission within a two-millisecond microsecond time window and instantly cut off power. The remote server locates the starting point of the vehicle being towed in the parking garage based on the channel fingerprint, realizing the retention of the vehicle's location and anti-theft alarm before the network and power outage.

[0161] Example 3: Emergency alarm scenario for over-discharge / low voltage of a single power battery cell in an underground parking garage.

[0162] This embodiment addresses the collaborative issue of the battery management system detecting a single battery cell voltage drop below a safety threshold during long-term parking in an underground garage, requiring an urgent report of a fault code to the cloud.

[0163] Step 1: Hardware-level environmental awareness and mode switching coordination.

[0164] The Battery Management System (BMS) chip sends a severe over-discharge alarm message for individual battery cells to the main control microprocessor via its internal communication bus. The main control microprocessor reads the analog-to-digital conversion channel to confirm that the terminal's own backup battery is also in a low-voltage state; simultaneously, it reads from the baseband that the air interface reference signal reception power is extremely low (-113 dBmW). The microprocessor's internal comparator triggers an external hard interrupt, shutting down the global satellite positioning RF module and other high-power peripheral buses such as the instrument display, freezing all connection-oriented network handshake protocols, and ensuring that the terminal's remaining weak power is concentrated at the communication transmission physical layer.

[0165] Step 2: Collaboration of XOR differential and redundancy truncation based on static memory.

[0166] The main control microprocessor retrieves eight bytes of historical static vehicle status data from memory. In the current status word, a specific byte representing the battery fault code (read from the battery management system via the bus) has changed. After the two status words are XORed by the arithmetic logic unit, the differential mask precisely locates the fault code byte. The main control microprocessor performs memory-level hard pruning, completely discarding redundant bytes such as unchanged vehicle speed and lock information, and only capturing the single-byte payload representing the individual cell over-discharge fault code.

[0167] Step 3: Dimensional reduction and substitution of satellite positioning data based on physical layer channel characteristics.

[0168] With the positioning radio frequency power supply physically cut off in step one, the baseband chip detects the downlink cellular reference signal in the current environment and calculates the strongest anti-fading pilot subcarrier amplitude quantization value (two bytes, used to characterize the parking garage location when the vehicle malfunctions). The main control microprocessor concatenates this positioning agent fingerprint bit by bit after the single-byte battery fault code in step two, reducing it to a three-byte ultra-miniature data payload.

[0169] Step 4: Coordination between read-only memory lookup mapping and microsecond-level burst transmission within noise gaps.

[0170] The microprocessor converts the three-byte payload into a memory addressing pointer, directly addressing the static lookup table in the flash ROM, and outputs a high Hamming distance coverage sequence waveform. The baseband chip skips the transport layer handshake and directly encapsulates it into the lowest-level connectionless broadcast data packet. The moment the RF front-end detects sudden noise in the basement within a millisecond-level silence window, the power amplifier rapidly activates and completes transmission in two milliseconds, then physically de-energizes. Upon receiving the ultra-micro packet, the cloud decodes the battery fault code and location fingerprint, completing the final location and early warning before battery thermal runaway.

[0171] Example 4: Emergency avoidance alarm scenario where the vehicle experiences high temperature / thermal runaway in the power battery compartment while inside the underground parking garage.

[0172] This embodiment addresses the collaborative problem of reporting an emergency fire alarm within a "thousand milliseconds of extremely narrow life-saving channel" before a vehicle experiences a sudden temperature rise inside its battery pack in a closed, blind-spot-filled underground parking garage, prior to thermal runaway causing a power outage or fire.

[0173] Step 1: Hardware-level environmental awareness and mode switching coordination.

[0174] The resistance of the temperature sensor (negative temperature coefficient thermistor) inside the battery compartment suddenly dropped due to the high temperature. The analog comparator of the vehicle terminal's main control microprocessor detected that this voltage divider signal exceeded the ultimate safe voltage threshold (representing a temperature exceeding 80 degrees Celsius), and determined that thermal runaway had occurred. The microprocessor instantly confirmed that the received signal strength was extremely poor. The microprocessor directly sent a trigger signal to the highest priority hardware interrupt controller, instantly physically shutting down all external power supplies, including GPS, vehicle bus gateway, etc., and forcibly blocking the network protocol handshaking, putting the entire microprocessor and baseband chip into a "dedicated power supply" single-burst physical transmission state.

[0175] Step 2: Collaboration of XOR differential and redundancy truncation based on static memory.

[0176] The microprocessor retrieves the existing static status word from memory and performs a fast XOR operation with the current status word representing the thermal runaway emergency state (fire fault code). The differential mask output by the arithmetic logic unit indicates that the "fire safety bit" of the zeroth byte has been flipped. The microprocessor performs physical memory trimming, completely stripping and truncating dozens of bytes of redundant information such as unchanged door and window information and power supply data, retaining only a single byte of the fire emergency fault code.

[0177] Step 3: Dimensional reduction and substitution of satellite positioning data based on physical layer channel characteristics.

[0178] Under the high timeliness requirements of fire alarms, the terminal cannot wait for satellite acquisition. The microprocessor directly captures the multipath channel state amplitude characteristic value generated by the baseband chip when receiving downlink reference signals from the cellular base station, quantizes it, and truncates it into a two-byte physical location proxy feature. The main control microprocessor directly concatenates this location feature to the single-byte thermal runaway alarm payload in step two to form the final three-byte life-saving payload.

[0179] Step 4: Coordination between read-only memory lookup mapping and microsecond-level burst transmission within noise gaps.

[0180] The main control microprocessor converts the three-byte payload into a memory offset address, directly addresses the read-only memory, and outputs a robust cyclic overlay sequence code with maximized Hamming distance. The baseband chip encapsulates this sequence as a connectionless physical broadcast frame (with an over-the-air transmission time of only 1.5 milliseconds). During microsecond-level noise floor energy detection, once the baseband chip detects a channel thermal noise trough, the power amplifier instantly turns on at full power and transmits the frame in 1.5 milliseconds before power is cut off. Before the vehicle burns out or completely loses power, the base station receives a fire alarm with channel characteristics. The cloud immediately locates the vehicle's parking space and activates the underground parking garage's fire sprinkler system, saving property.

[0181] Example 5: At a charging station with a weak signal in the underground parking garage, the charging gun encounters an illegal unplugging / electricity theft alarm scenario.

[0182] This embodiment addresses the issue of a sudden change in resistance in the physical circuit of the charging gun control guide (CC) or control signal (CP) caused by illegal removal of the charging gun by external force when a vehicle is charging at a charging station in an underground parking garage, requiring the reporting of a "charging abnormal interruption" alarm.

[0183] Step 1: Hardware-level environmental awareness and mode switching coordination.

[0184] The resistance value of the control signal (CP / CC) detection circuit of the charging gun's physical interface suddenly changes due to a physical plug-in / plug-out interruption, generating a falling edge pulse in the hardware interface detection circuit. The main microprocessor, upon detecting this external interrupt and being awakened, immediately reads the RF baseband register and confirms that the reference signal received power is -111 dBmW. With both conditions met, the main microprocessor directly shuts down the low-dropout linear regulators of the charging metering module and the GPS module, blocking the ongoing network handshake and allowing memory and RF resources to be fully allocated to simplified broadcast transmission.

[0185] Step 2: Collaboration of XOR differential and redundancy truncation based on static memory.

[0186] The main microprocessor retrieves the historical charging reference status word (recording the normal charging state) from memory. The current status word changes due to a shift in the detection circuit level. After the two status words are XORed by the microprocessor's internal logic gate, the differential mask precisely indicates that the "charging status" byte has changed from charging to abnormal disconnection. The main microprocessor immediately executes bus truncation, discarding meaningless redundant data such as the current battery state of charge (SOC) and current voltage and current, retaining only this single byte of "charging abnormal interrupt code".

[0187] Step 3: Dimensional reduction and substitution of satellite positioning data based on physical layer channel characteristics.

[0188] Since the satellite positioning module was physically powered off in step one, the baseband chip directly extracted the physical layer multipath fading characteristic parameters of the downlink reference signal of the cellular cell and quantized them into a two-byte channel amplitude feature fingerprint in the baseband. The main control microprocessor then concatenated this two-byte feature fingerprint bit by bit with the single-byte alarm data in step two, integrating it into the final three-byte positioning-fault hybrid data payload.

[0189] Step 4: Coordination between read-only memory lookup mapping and microsecond-level burst transmission within noise gaps.

[0190] The main control microprocessor uses the three-byte hybrid payload as the physical address offset for memory access and looks up the cyclic overlay sequence code embedded in the read-only memory. This sequence is encapsulated by the RF baseband processing chip into a low-level bare broadcast data frame (with an airtime of only two milliseconds). During the physical layer idle channel assessment, the RF baseband quickly captures the microsecond-level silence window where impulse noise occurs in the parking garage, instantly enables the power amplifier, and bursts the broadcast frame within two milliseconds. Subsequently, the power amplifier is turned off, and the system enters sleep mode. After receiving the fault code, the cloud server locates the charging station parking space based on the channel feature fingerprint and immediately pushes a "charging gun forcibly unplugged" alarm to the car owner's mobile phone, successfully preventing electricity theft and malicious damage.

[0191] It should be understood that the methods and devices disclosed in the several embodiments provided in this application can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of modules or units is merely a logical functional division, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0192] If the integrated units in the other embodiments described above are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0193] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A communication method for an on-board terminal in an underground parking garage, characterized in that, The method includes: The main control microprocessor reads the current remaining power of the backup battery of the vehicle terminal, and reads the current reference signal receiving power of the radio frequency baseband processing chip of the vehicle terminal; When the current remaining power and the current reference signal receiving power both meet the physical degradation conditions, the main control microprocessor enters the low-level feature simplified broadcast mode, cuts off the power supply circuit of the global satellite positioning radio frequency receiving module and other non-essential environmental sensors, and sends the low-level reset and reconfiguration command to the radio frequency baseband processing chip, freezing the currently running connection-oriented long connection network protocol stack. The main control microprocessor reads the current level signals of each actuator and sensor through the underlying bus and maps the current level signals to the current status word; The main control microprocessor writes the current state word and the basic state word into the internal arithmetic logic unit, so that the arithmetic logic unit performs a bitwise XOR operation on the current state word and the basic state word to obtain the differential mask register value; The main control microprocessor performs a non-zero detection on the value of the differential mask register. When the detection result is non-zero, it extracts the non-zero byte from the value of the differential mask register and concatenates the non-zero byte with the actual change value corresponding to the non-zero byte to obtain the differential state payload of a single byte. The main control microprocessor wakes up the physical layer measurement mechanism of the radio frequency baseband processing chip through the internal instruction bus, so that the radio frequency baseband processing chip locks the downlink reference signal sent by the serving base station and converts the downlink reference signal into a digital baseband signal; The main control microprocessor instructs the radio frequency baseband processing chip to perform dimensionality reduction extraction on the digital baseband signal to obtain two bytes of channel physical characteristics; The main control microprocessor concatenates the differential state payload and the channel physical characteristics to obtain a three-byte physical payload; The main control microprocessor uses the physical load as an offset of the memory address to access the static mapping lookup table in the non-volatile read-only memory to obtain the corresponding overlay sequence code bit stream. The main control microprocessor sends the overlay sequence code bit stream to the radio frequency baseband processing chip, so that the radio frequency baseband processing chip sends out the overlay sequence code bit stream.

2. The method according to claim 1, characterized in that, When both the current remaining battery power and the current reference signal reception power meet the physical degradation conditions, the main control microprocessor enters a low-level feature-based simplified broadcast mode, including: The main control microprocessor constructs a sliding time window; The main control microprocessor performs real-time physical degradation condition judgment on the current remaining power and the current reference signal receiving power within the sliding time window; The physical degradation condition is met when the power of the reference signal received is lower than the preset fading power threshold of the extremely weak network in multiple consecutive times within the sliding time window, and when the current remaining power is lower than the preset over-discharge voltage safety threshold. The main control microprocessor enters the low-level feature-simplified broadcast mode.

3. The method according to claim 2, characterized in that, The main control microprocessor enters a low-level feature-based simplified broadcast mode, including: The comparator logic inside the main control microprocessor triggers a high-priority external hardware interrupt pin level to flip, outputting a hardware interrupt signal; After the main interrupt controller of the main microprocessor detects the hardware interrupt signal, it immediately suspends all currently executing regular application layer software threads, pushes the field data of the key registers onto the stack for protection, and forces the system state machine pointer to jump to the preset starting memory address of the low-level feature simplified broadcast mode, and enters the low-level feature simplified broadcast mode.

4. The method according to claim 1, characterized in that, The main control microprocessor reads the current level signals of each actuator and sensor through the underlying bus, and maps the current level signals to a current status word, including: If a status reporting request is triggered by the vehicle's controller area network bus or general input / output pin, the main control microprocessor reads the current level signals of each actuator and sensor through the underlying bus; The main control microprocessor maps the current level signal to the current status word according to the same bit field mapping rules as the basic status word.

5. The method according to claim 1, characterized in that, The main control microprocessor wakes up the physical layer measurement mechanism of the RF baseband processing chip via its internal instruction bus, so that the RF baseband processing chip locks onto the downlink reference signal sent by the serving base station and converts the downlink reference signal into a digital baseband signal, including: The main control microprocessor detects the hardware status pins of the global satellite navigation module or the timestamp of the last valid positioning. The main control microprocessor determines whether it is in a satellite signal blind zone based on the hardware status pin or the last valid positioning timestamp. When it is confirmed that the current location is in a satellite signal blind zone, the main control microprocessor completely destroys the standard structured text frame originally used to assemble location information in memory, thereby eliminating the occupation of the transmission buffer by invalid location information and blocking the resource consumption of invalid zero-value characters in subsequent air interface transmission.

6. The method according to claim 1, characterized in that, The main control microprocessor instructs the RF baseband processing chip to perform dimensionality reduction extraction on the downlink reference signal to obtain two bytes of channel physical features, including: The main control microprocessor instructs the radio frequency baseband processing chip to perform dimensionality reduction extraction on the digital baseband signal, so that the hardware digital signal processing unit of the radio frequency baseband processing chip can lock only the two dominant frequency subcarriers with the strongest signal energy in the digital baseband signal and directly discard their phase information. It can only calculate and extract the signal amplitude fading values ​​of the two subcarriers, and map the calculated and extracted signal amplitude fading values ​​into hexadecimal physical quantization indicators through a hardware quantizer to obtain the channel physical characteristics. The channel physical characteristics are then stored in the diagnostic register of the radio frequency baseband processing chip. The main control microprocessor reads the channel physical characteristics from the diagnostic register.

7. The method according to any one of claims 1 to 6, characterized in that, The static mapping lookup table includes cyclic overlay sequence codes generated through exhaustive computation; the geometric characteristic of the cyclic overlay sequence codes is that any two different three-byte data sequences map to a bit sequence that maintains the maximum physical Hamming distance.

8. The method according to any one of claims 1 to 6, characterized in that, The main control microprocessor sends the overlay sequence code bitstream to the radio frequency baseband processing chip, so that the radio frequency baseband processing chip sends out the overlay sequence code bitstream, including: The main control microprocessor sends the overlay sequence code bitstream to the transmit buffer register of the radio frequency baseband processing chip, so that the radio frequency baseband processing chip adds the most basic media access control layer hardware addressing header and the cyclic redundancy check tail for verifying integrity to the overlay sequence code bitstream, and encapsulates the overlay sequence code bitstream into a physical broadcast raw data frame. After receiving the transmission trigger command, the radio frequency baseband processing chip first controls the radio frequency receiving front end to perform channel noise floor energy detection. The analog-to-digital converter of the radio frequency baseband processing chip collects the level values ​​of background thermal noise and pulse interference in the current frequency band; When the background thermal noise and pulse interference levels sampled for several consecutive times are lower than the set interference blocking threshold, the control logic inside the RF baseband processing chip instantly pulls up the level of the power control pin to supply power to the RF power amplifier. At the instant the RF power amplifier is activated, the physical broadcast raw data frame is ejected into the air in the form of electromagnetic waves within two milliseconds. A few microseconds after the transmission is completed, the RF baseband processing chip immediately cuts off the power supply to the RF power amplifier and puts the entire communication module of the RF baseband processing chip into a deep sleep power-off state through the hardware reset pin.

9. A vehicle-mounted terminal communication device for an underground parking garage, characterized in that, The underground parking garage vehicle-mounted terminal communication device includes a main control microprocessor, a radio frequency baseband processing chip, and a memory. The main control microprocessor is connected to the radio frequency baseband processing chip and the memory. The memory stores a computer program. The main control microprocessor is used to call the computer program to implement the underground parking garage vehicle-mounted terminal communication method as described in any one of claims 1-8.

10. A vehicle, characterized in that, The vehicle includes the underground garage vehicle-mounted terminal communication device as described in claim 9.

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