Adaptive communication method for a car digital key compatible with multiple interconnection standards

Abstract

This invention discloses an adaptive communication method for car digital keys compatible with multiple interconnection standards, relating to the field of multi-mode communication. The method includes: initializing the communication module and sending multi-band detection signals after the car digital key is started; filtering accessible devices and supported interconnection standards to generate a candidate set; selecting the optimal standard to establish an initial communication link after ranking based on indicators such as signal strength, stability, and speed; real-time monitoring of link status and demand changes during operation; reassessing the compatibility of candidate standards when an early warning is triggered; dynamically repairing or switching standards; maintaining data transmission continuity through breakpoint resumption; and resuming communication after new link authentication; dynamically optimizing parameters and periodically updating the configuration library during the process; and closing the link and releasing resources when the task ends or a disconnection command is received. The advantages of this invention are: compatibility with multiple interconnection standards; ensuring stable and secure communication through dynamic monitoring and adaptive adjustment; and balancing compatibility, efficiency, and low power consumption.

Description

Technical Field

[0001] This invention relates to the field of multimode communication, and in particular to an adaptive communication method for automotive digital keys that are compatible with multiple interconnection standards. Background Technology

[0002] The communication method of car digital keys is an innovative solution that emerged against the backdrop of the rapid development of intelligent connected vehicle technology. It aims to replace traditional physical keys, enabling keyless entry, start, and sharing functions of vehicles through digital means. With the widespread adoption of smartphones, the maturity of IoT technology, and the increasing demand from users for convenience and security, digital keys utilize wireless technologies such as Near Field Communication (NFC), Bluetooth Low Energy (BLE), and Ultra Wideband (UWB) to achieve secure interaction between car owners and their vehicles.

[0003] The core disadvantages of current automotive digital key communication methods lie in their comprehensive lack of compatibility, dynamic adaptability, and stability. Most solutions rely on a single communication standard, resulting in significant ecosystem barriers, low cross-brand and cross-model compatibility, and frequent pairing failures or functional malfunctions. Communication parameters are mostly statically configured, making them unsuitable for complex environments such as underground parking garages and areas with signal obstruction. This leads to frequent location drift and "standing-out unlocking" issues with Bluetooth solutions, while UWB solutions suffer from excessive power consumption, limited coverage, and high costs. The lack of real-time link monitoring and intelligent adjustment mechanisms makes it difficult to dynamically optimize parameters or switch standards. Communication interruptions are prone to occur when faced with signal fluctuations or changing requirements. Furthermore, security vulnerabilities exist; Bluetooth solutions are susceptible to relay attacks, and some solutions also suffer from inconvenient configuration library updates and untimely resource release, severely impacting user experience and security. Summary of the Invention

[0004] To improve existing methods, an adaptive communication method for car digital keys that is compatible with multiple interconnection standards is provided. This method is compatible with multiple interconnection standards, and ensures stable and secure communication through dynamic monitoring and adaptive adjustment. It takes into account adaptability, efficiency and low power consumption, and significantly improves the reliability of car digital key communication and user experience.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: Adaptive communication methods for car digital keys compatible with multiple connectivity standards, including: After the car digital key is started, the communication module is initialized, a pre-set library of multiple interconnection standard configurations is loaded, and multi-band detection signals are sent to the outside world based on the initialized communication module. Feedback signals are captured in real time and signal features are extracted. Accessible car-end communication devices and interconnection standards supported by the devices are screened, a candidate interconnection standard set is generated, and the signal strength corresponding to each standard is recorded. Based on the acquired set of candidate interconnection standards and signal strength, the candidate interconnection standards are ranked according to signal stability, communication rate, power consumption level, security level and application scenario adaptability, and the interconnection standard with the highest priority is selected as the initial communication standard. The digital key calls the corresponding communication protocol parameters and authentication rules from the interconnection standard configuration library based on the initial communication standard to complete the two-way identity authentication between the vehicle-side communication device and the digital key and establish the initial communication link; The digital key monitors the status parameters of the communication link in real time, its own power consumption status, and changes in the communication requirements of the vehicle. It triggers a link status early warning mechanism by setting status thresholds. When a link status warning is triggered or a change in vehicle-side communication requirements is detected, the adaptability of each candidate interconnection standard is reassessed based on the current communication status data, vehicle-side requirement instructions, and candidate interconnection standard set. Based on the recoverability of the current standard's abnormal state, parameter optimization or switching of interconnection standards is performed. The digital key transmits data based on the target interconnection standard parameters of the switch and uses a breakpoint resume mechanism. After the switch is completed, it sends a link reconnection request to the vehicle and performs identity authentication under the target interconnection standard. After the vehicle verifies the identity, a new communication link is established. During stable communication, the digital key dynamically adjusts the communication parameters of the current interconnection standard, periodically checks the update status of the interconnection standard configuration library, and closes the communication link and releases communication resources when the communication task is completed or a disconnection command is detected from the vehicle.

[0006] Preferably, after the car digital key is started, it performs communication module initialization, loads a preset library of multiple interconnection standard configurations, sends multi-band detection signals to the outside world based on the initialized communication module, captures feedback signals in real time and extracts signal features, filters accessible car-end communication devices and the interconnection standards supported by the devices, generates a candidate interconnection standard set and records the signal strength corresponding to each standard, specifically including: After the car digital key is started, it performs the communication module initialization operation, completes the communication port reset, hardware driver loading and basic communication parameter configuration, and loads a variety of preset interconnection standard configuration libraries; Based on the communication module, a wide-spectrum scanning method is used to cover the communication frequency bands corresponding to each interconnection standard, and the signal receiving channel is opened to capture surrounding feedback signals in real time. The system performs signal strength detection, frequency band identification, and signal feature extraction on the feedback signal, filters out valid signals carrying vehicle-side communication identifiers, obtains the accessible vehicle-side communication devices and the set of candidate interconnection standards supported by the devices, generates a candidate standard list, and records the signal strength parameters corresponding to each standard.

[0007] Preferably, the step of ranking the candidate interconnection standards based on the acquired set of candidate interconnection standards and signal strength, combined with signal stability, communication rate, power consumption level, security level, and application scenario adaptability, and selecting the interconnection standard with the highest priority as the initial communication standard specifically includes: Based on the acquired candidate interconnection standard set, the measured index data corresponding to each standard are collected; Based on the default weights: security level 30%, signal stability 25%, communication rate 20%, power consumption level 15%, and scenario adaptability 10%, the indicator data of each candidate standard are weighted and summed to obtain the comprehensive score of each standard. Candidate standards are ranked based on comprehensive scores, a priority sequence is generated and each standard score is labeled, and the standard with the highest score is selected as the initial communication standard.

[0008] Preferably, the digital key, based on the initial communication standard, calls the corresponding communication protocol parameters and authentication rules from the interconnection standard configuration library to complete the two-way identity authentication between the vehicle-side communication device and the digital key and establish the initial communication link, specifically including: Based on the initial communication standard, the corresponding complete protocol parameters are retrieved from the Internet standard configuration library, including physical layer transmission rate, data link layer frame structure, check bit algorithm and authentication port number; Send a link connection request to the vehicle's communication device, including digital key identification information, initial standard identifier, and authentication start command; After receiving the connection request, the vehicle sends out authentication challenge information and generates authentication response information using a hybrid encryption mechanism; After the vehicle verifies the response information and returns a link establishment confirmation message, the two-way identity authentication is completed and the initial communication link is established.

[0009] Preferably, the digital key monitors the status parameters of the communication link, its own power consumption, and changes in the communication requirements of the vehicle in real time. The link status early warning mechanism triggered by setting a status threshold specifically includes: Digital keys monitor key status parameters of communication links in real time, including signal strength, data transmission rate, bit error rate, latency, and link connection stability. Real-time acquisition of power supply current and voltage of each communication module of the digital key, calculation of real-time power consumption, monitoring of demand commands sent by the vehicle, parsing command types to determine changes in communication demand; By setting a status threshold, the collected parameters are compared with the threshold of the corresponding standard. If any parameter exceeds the threshold twice in a row, a link warning is triggered. The warning type, abnormal parameter value, trigger time, and current communication standard information are written to a temporary log buffer, and the log data includes a timestamp.

[0010] Preferably, when a link status warning is triggered or a change in vehicle-side communication requirements is detected, the adaptability of each candidate interconnection standard is reassessed based on the current communication status data, vehicle-side requirement commands, and candidate interconnection standard set. Based on the recoverability of the current standard's abnormal state, parameter optimization or switching of the interconnection standard is specifically performed, including: When a link status warning is triggered or a change in vehicle-side communication requirements is detected, if it is a parameter anomaly warning, the type of abnormal parameter, the threshold range exceeded, and the duration are extracted; if it is a requirement change, the instruction type and the corresponding communication requirement indicators are identified. The parameter adjustment threshold of the current communication standard is called to determine whether abnormal parameters can be repaired through dynamic adjustment. If they can be repaired, a parameter adjustment plan is generated, and the parameters are monitored to see if they return to the normal range after adjustment. If the problem cannot be repaired, the comprehensive score of each candidate standard will be recalculated based on the current communication status data, demand indicators and candidate interconnection standard set, and the target switching standard with the best adaptability will be selected. Based on the target switching standard, the communication parameters of the target standard are called from the interconnection standard configuration library to complete the parameter pre-configuration and communication module status reset before the switch.

[0011] Preferably, the digital key transmits data based on the target interconnection standard parameters during the switch, using a breakpoint resume mechanism. After the switch is completed, it sends a link reconnection request to the vehicle, performs identity authentication under the target interconnection standard, and establishes a new communication link after successful verification at the vehicle end. Specifically, this includes: Based on the protocol parameters of the target standard, a temporary link connection request is sent to the vehicle, and the continuity of data transmission is maintained through the breakpoint resume mechanism. After data synchronization is complete, a notification of the original link being disconnected is sent to the vehicle. After receiving a disconnection confirmation response from the vehicle, the communication resources occupied by the original link are released. Send an authentication request to the vehicle and receive a successful authentication response from the vehicle. Establish a formal target standard communication link, record the new link parameters and mark the switch as successful. If authentication fails or link establishment fails, try to restore the original communication link first. If the original link is unavailable, re-execute the candidate interconnection standard screening and switching process.

[0012] Preferably, during the stable communication process, the digital key dynamically adjusts the communication parameters of the current interconnection standard, periodically checks the update status of the interconnection standard configuration library, and closes the communication link and releases communication resources when the communication task is completed or a disconnection command is detected from the vehicle. Specifically, this includes: Real-time collection of historical data of the current communication link, combined with the current application scenario to construct a parameter optimization analysis dataset, and adjustment of communication parameters through adaptive optimization strategies; Regularly check the update status of the interconnected standard configuration library. If a standard update package pushed by the cloud server is detected, the update package will be downloaded and the configuration library will be synchronized and updated in the background without interrupting the current communication. When the communication task is completed or a disconnection command is detected from the vehicle, the communication link is closed, communication resources are released, and the communication process is completed.

[0013] Compared with the prior art, the advantages of the present invention are: By employing multi-band detection and candidate standard selection during the startup phase, compatibility with different automotive communication devices is ensured, avoiding the limitations of a single standard. Initial standards are selected based on a weighted ranking of multi-dimensional indicators, combined with real-time link monitoring and early warning mechanisms. Parameters can be dynamically optimized or standards switched, effectively improving communication stability and anti-interference capabilities. Breakpoint resumption and two-way authentication mechanisms balance data transmission continuity and security, adapting to diverse application scenarios. Simultaneously, dynamic parameter optimization and background configuration library updates ensure communication efficiency and compatibility with technological iterations. Resources are released promptly after task completion to reduce power consumption, significantly improving the reliability, adaptability, and user experience of automotive digital key communication. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the method proposed in this invention; Figure 2 This is a schematic diagram of communication initialization and device awareness proposed in this invention; Figure 3 This is a schematic diagram of the priority sorting proposed in this invention; Figure 4 This is a schematic diagram of the initial communication link establishment proposed in this invention; Figure 5 This is a schematic diagram of the dynamic state monitoring proposed in this invention; Figure 6 This is a schematic diagram of the interconnection standard switching proposed in this invention; Figure 7 This is a schematic diagram of the smooth handover and link reconnection proposed in this invention; Figure 8 This is a schematic diagram illustrating the communication optimization and standard library update proposed in this invention. Detailed Implementation

[0015] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0016] See Figure 1 As shown, the adaptive communication method for car digital keys compatible with multiple connectivity standards includes: Step 1: After the car digital key is started, the communication module is initialized, a pre-set library of multiple interconnection standards is loaded, and multi-band detection signals are sent to the outside world based on the initialized communication module. Feedback signals are captured in real time and signal features are extracted. Accessible car-end communication devices and the interconnection standards supported by the devices are screened, a candidate interconnection standard set is generated, and the signal strength corresponding to each standard is recorded. Step 2: Based on the acquired set of candidate interconnection standards and signal strength, and considering factors such as signal stability, communication rate, power consumption level, security level, and application scenario adaptability, the candidate interconnection standards are ranked, and the interconnection standard with the highest priority is selected as the initial communication standard. Step 3: Based on the initial communication standard, the digital key calls the corresponding communication protocol parameters and authentication rules from the interconnection standard configuration library to complete the two-way identity authentication between the vehicle-side communication device and the digital key and establish the initial communication link; Step 4: The digital key monitors the status parameters of the communication link, its own power consumption status, and changes in the communication requirements of the vehicle in real time, and triggers the link status early warning mechanism by setting status thresholds; Step 5: When a link status warning is triggered or a change in vehicle-side communication requirements is detected, the adaptability of each candidate interconnection standard is reassessed based on the current communication status data, vehicle-side requirement instructions, and candidate interconnection standard set. Based on the recoverability of the current standard's abnormal status, parameter optimization or switching of interconnection standards is performed. Step 6: Based on the target interconnection standard parameters of the switch, the digital key transmits data through the breakpoint resume mechanism. After the switch is completed, it sends a link reconnection request to the vehicle and performs identity authentication under the target interconnection standard. After the vehicle verifies the identity, a new communication link is established. Step 7: During stable communication, the digital key dynamically adjusts the communication parameters of the current interconnection standard, periodically checks the update status of the interconnection standard configuration library, and closes the communication link and releases communication resources when the communication task is completed or a disconnection command is detected from the vehicle.

[0017] See Figure 2 As shown, after the car digital key is started, the communication module is initialized, a pre-set library of multiple interconnection standards is loaded, and multi-band detection signals are sent out based on the initialized communication module. Feedback signals are captured in real time and signal features are extracted. Accessible car-side communication devices and the interconnection standards supported by these devices are screened, a candidate interconnection standard set is generated, and the signal strength corresponding to each standard is recorded. Specifically, this includes: After the car digital key is started, it performs the communication module initialization operation, completes the communication port reset, hardware driver loading and basic communication parameter configuration, and loads a variety of preset interconnection standard configuration libraries; Based on the communication module, a wide-spectrum scanning method is used to cover the communication frequency bands corresponding to each interconnection standard, and the signal receiving channel is opened to capture surrounding feedback signals in real time. The system performs signal strength detection, frequency band identification, and signal feature extraction on the feedback signal, filters out valid signals carrying vehicle-side communication identifiers, obtains the accessible vehicle-side communication devices and the set of candidate interconnection standards supported by the devices, generates a candidate standard list, and records the signal strength parameters corresponding to each standard.

[0018] Specifically, the system obtains feedback signals from the surrounding area, and the bandwidth of the receiving channel matches the signal bandwidth of the corresponding standard. The signal acquisition time window is set to 200ms, and the signal input is continuously monitored within the window. The acquired raw signals are timestamped, and the signal reception time and corresponding receiving channel information are recorded. The validity of the signals after initial matching is verified. The first verification is signal strength detection, which measures the signal strength by receiving the signal strength indicator module and filters out signals with a strength greater than -85dBm. The second verification is device identification verification, which parses the device identification field in the signal frame and matches it with the list of authorized vehicle device identifications pre-stored in the digital key, eliminating signals from unauthorized devices. The third verification is frame structure integrity verification, which checks whether the check bits of the signal frame are correct to ensure that the signal has not been distorted or tampered with during transmission. Signals that pass all three verifications are valid signals.

[0019] See Figure 3 As shown, based on the acquired set of candidate interconnection standards and signal strength, and considering factors such as signal stability, communication rate, power consumption level, security level, and application scenario adaptability, the candidate interconnection standards are ranked, and the interconnection standard with the highest priority is selected as the initial communication standard. Specifically, these include: Based on the acquired candidate interconnection standard set, the measured index data corresponding to each standard are collected; Based on the default weights: security level 30%, signal stability 25%, communication rate 20%, power consumption level 15%, and scenario adaptability 10%, the indicator data of each candidate standard are weighted and summed to obtain the comprehensive score of each standard. Candidate standards are ranked based on comprehensive scores, a priority sequence is generated and each standard score is labeled, and the standard with the highest score is selected as the initial communication standard.

[0020] Specifically, from the generated set of candidate interconnection standards, the corresponding indicator data for each standard are extracted, including signal strength fluctuation records, maximum transmission rate parameters, typical power consumption test data, security mechanism details and current scenario information. Missing data is filled in by using the average of the same type of standards to ensure that the five indicator data of each candidate standard are complete. Each indicator of the candidate interconnection standard is scored according to quantitative standards. For example, excellent signal stability scores 90-100 points, medium scores 60-89 points, and poor scores 0-59 points. A weighted total score is calculated based on the configured weight coefficients. The candidate standards are then sorted in descending order of weighted total score to generate a priority ranking table. The table records the individual indicator scores, weighted total scores, and rankings of each standard. If there is a tie in the total score, a secondary ranking mechanism is initiated, using the signal stability index score as the secondary ranking basis, with the higher score ranking higher. If the secondary ranking is still tied, the security level is used as the final ranking basis.

[0021] See Figure 4 As shown, the digital key, based on the initial communication standard, calls the corresponding communication protocol parameters and authentication rules from the interconnection standard configuration library to complete the two-way identity authentication between the vehicle-side communication device and the digital key and establish the initial communication link. Specifically, this includes: Based on the initial communication standard, the corresponding complete protocol parameters are retrieved from the Internet standard configuration library, including physical layer transmission rate, data link layer frame structure, check bit algorithm and authentication port number; Send a link connection request to the vehicle's communication device, including digital key identification information, initial standard identifier, and authentication start command; After receiving the connection request, the vehicle sends out authentication challenge information and generates authentication response information using a hybrid encryption mechanism; After the vehicle verifies the response information and returns a link establishment confirmation message, the two-way identity authentication is completed and the initial communication link is established.

[0022] Specifically, after receiving a connection request, the vehicle first verifies the integrity of the frame structure and the legality of the initial standard identifier. If the verification passes, a random identity challenge information is generated. The challenge information is encrypted using an asymmetric encryption algorithm, and after encryption, the vehicle's digital certificate is added. The encrypted challenge response frame is then sent to the digital key. After receiving the challenge response frame, the digital key first verifies the validity of the vehicle's digital certificate using a pre-set root certificate. Once the verification is successful, it decrypts the challenge information using its own private key and extracts the random number and timestamp. Based on the decrypted random number, combined with the digital key's own device information and the pre-set authorization key, it generates authentication response data, encrypts the response data using a symmetric encryption algorithm, and attaches the digital key's digital certificate. The encrypted authentication response data and digital certificate are encapsulated into a response frame and sent to the vehicle. Upon receiving the frame, the vehicle first verifies the validity of the digital key certificate, then decrypts the response data using the digital key's public key, compares the random number in the response data with the random number it sent, and simultaneously verifies whether the digital key device identifier is in the authorized list. The verification process includes triple verification of certificate validity, random number matching degree, and device authorization status. If any step fails, an authentication failure command is sent, and the reason for the failure is recorded. After the vehicle-side triple verification passes, a link establishment confirmation message is generated, encrypted, and sent to the digital key. The digital key receives and decrypts the confirmation message, extracts the session key, and completes the final calibration of the communication module parameters according to the configuration instructions. Both parties synchronously start the data transmission channel, record the current link status to their respective status registers, and complete the initial communication link establishment.

[0023] See Figure 5 As shown, the digital key monitors the status parameters of the communication link in real time, its own power consumption status, and changes in the communication requirements of the vehicle. A link status early warning mechanism is triggered by setting status thresholds, specifically including: Digital keys monitor key status parameters of communication links in real time, including signal strength, data transmission rate, bit error rate, latency, and link connection stability. Real-time acquisition of power supply current and voltage of each communication module of the digital key, calculation of real-time power consumption, monitoring of demand commands sent by the vehicle, parsing command types to determine changes in communication demand; By setting a status threshold, the collected parameters are compared with the threshold of the corresponding standard. If any parameter exceeds the threshold twice in a row, a link warning is triggered. The warning type, abnormal parameter value, trigger time, and current communication standard information are written to a temporary log buffer, and the log data includes a timestamp.

[0024] Specifically, signal strength is acquired in real time by the RSSI module, with one value recorded per sampling period; bit error rate is calculated by counting the number of failed verification frames in 100 consecutive data frames; latency is obtained by recording the difference between the data frame transmission timestamp and the received response timestamp; link stability is determined by the packet loss of consecutive transmission frames, and the number of consecutive stable transmission frames is recorded; digital key power consumption is collected by the power management module to collect operating current and voltage data; changes in vehicle-side communication requirements are identified by parsing the control command frames sent by the vehicle. The preprocessed valid data is compared with the preset threshold one by one. If a single parameter exceeds the threshold for two consecutive sampling periods or any two or more parameters exceed the threshold at the same time, a link status warning is triggered. The warning level, triggering parameter and specific value are recorded according to the severity of the anomaly.

[0025] See Figure 6 As shown, when a link status warning is triggered or a change in vehicle-side communication requirements is detected, the adaptability of each candidate interconnection standard is reassessed based on the current communication status data, vehicle-side requirement commands, and candidate interconnection standard set. Based on the recoverability of the current standard's abnormal state, parameter optimization or switching of the interconnection standard is performed. Specifically, this includes: When a link status warning is triggered or a change in vehicle-side communication requirements is detected, if it is a parameter anomaly warning, the type of abnormal parameter, the threshold range exceeded, and the duration are extracted; if it is a requirement change, the instruction type and the corresponding communication requirement indicators are identified. The parameter adjustment threshold of the current communication standard is called to determine whether abnormal parameters can be repaired through dynamic adjustment. If they can be repaired, a parameter adjustment plan is generated, and the parameters are monitored to see if they return to the normal range after adjustment. If the problem cannot be repaired, the comprehensive score of each candidate standard will be recalculated based on the current communication status data, demand indicators and candidate interconnection standard set, and the target switching standard with the best adaptability will be selected. Based on the target switching standard, the communication parameters of the target standard are called from the interconnection standard configuration library to complete the parameter pre-configuration and communication module status reset before the switch.

[0026] Specifically, based on the decision dataset, it is first determined whether the current standard anomaly can be repaired through parameter optimization, and repair judgment conditions are set: only a single parameter is slightly abnormal, there is no core parameter anomaly, and there is no urgent need on the vehicle side; if the conditions are met, the parameter optimization scheme is activated: if the signal is weak, the transmission power is increased; if the bit error rate is high, the number of retransmissions is increased and the data frame length is shortened; if the latency is high, the frame structure is optimized. If the anomaly persists after parameter optimization, is initially determined to be an unrepairable anomaly, or a change in vehicle-side requirements is detected, a standard switch is required. If the anomaly is eliminated after parameter optimization, the switch decision process is terminated, normal communication is restored, and parameter adjustment logs are recorded. Based on the candidate interconnection standard set, and combined with the current anomaly type and automotive needs, a compatibility assessment is conducted: for signal stability anomalies, standards with signal strength fluctuations <5dBm are prioritized; for high-speed transmission needs, UWB standards with a maximum rate >100Mbps are prioritized; and for low power consumption needs, Bluetooth Low Energy standards with an operating current ≤5mA are prioritized. At the same time, the switching cost is assessed, and standards with excessively high switching costs or compatibility scores <60 are eliminated, and 2-3 alternative target standards are selected. Priority scoring is re-executed for the candidate target criteria, and the highest score is selected as the final target switching criterion. If all candidate criteria scores are <60, the candidate criterion update process is initiated, and environmental detection is re-executed to supplement new candidate criteria. If there are still no qualified criteria, a communication anomaly alarm is triggered.

[0027] See Figure 7 As shown, the digital key transmits data based on the target interconnection standard parameters during the switch, using a breakpoint resume mechanism. After the switch is complete, it sends a link reconnection request to the vehicle, performs identity authentication under the target interconnection standard, and establishes a new communication link after successful verification at the vehicle. Specifically, this includes: Based on the protocol parameters of the target standard, a temporary link connection request is sent to the vehicle, and the continuity of data transmission is maintained through the breakpoint resume mechanism. After data synchronization is complete, a notification of the original link being disconnected is sent to the vehicle. After receiving a disconnection confirmation response from the vehicle, the communication resources occupied by the original link are released. Send an authentication request to the vehicle and receive a successful authentication response from the vehicle. Establish a formal target standard communication link, record the new link parameters and mark the switch as successful. If authentication fails or link establishment fails, try to restore the original communication link first. If the original link is unavailable, re-execute the candidate interconnection standard screening and switching process.

[0028] Specifically, after the original link is disconnected, the digital key initiates the formal switch of the target standard of the communication module, writes the pre-configured target standard parameters into the communication module register, overwriting the original standard parameters; restarts the transmission and reception channels of the communication module, completes the module status initialization, and ensures that the module works normally according to the target standard; at the same time, it calibrates the module's signal gain and filtering parameters to adapt to the communication characteristics of the target standard. Based on the trust credential generated during the initial authentication, the digital key generates a fast authentication request frame, which includes its own device identifier, trust credential digest, and a new session key request. After receiving the frame, the vehicle verifies the validity of the trust credential. If the verification is successful, a new temporary session key is generated, encrypted using a symmetric encryption algorithm, and then sent back to the digital key. The digital key decrypts the frame to obtain the new session key and completes the fast authentication. The digital key and the vehicle initiate a formal data transmission channel based on the new session key, sending three sets of test data frames to verify link connectivity. Each test frame contains data segments of different lengths. After receiving the test frames, the vehicle provides feedback on the reception status and transmission quality parameters. If the test data error rate is ≤1% and the latency meets the target standard threshold, the new communication link is confirmed to be successfully established. The digital key records the connection parameters and authentication status of the new link, calibrates the threshold configuration of the monitoring module, and completes the smooth switching process. If the test fails, it immediately returns to the original link or repeats the above steps until a stable link is established.

[0029] See Figure 8 As shown, during stable communication, the digital key dynamically adjusts the communication parameters of the current interconnection standard, periodically checks the update status of the interconnection standard configuration library, and closes the communication link and releases communication resources when the communication task is completed or a disconnection command is detected from the vehicle. Specifically, this includes: Real-time collection of historical data of the current communication link, combined with the current application scenario to construct a parameter optimization analysis dataset, and adjustment of communication parameters through adaptive optimization strategies; Regularly check the update status of the interconnected standard configuration library. If a standard update package pushed by the cloud server is detected, the update package will be downloaded and the configuration library will be synchronized and updated in the background without interrupting the current communication. When the communication task is completed or a disconnection command is detected from the vehicle, the communication link is closed, communication resources are released, and the communication process is completed.

[0030] Specifically, based on real-time monitoring data and historical data, core communication parameters are adjusted through adaptive optimization algorithms: transmission power is adjusted in 0.5dBm increments to minimize power consumption while ensuring signal strength ≥-80dBm; data frame length is dynamically adapted according to transmission load, and retransmission mechanism parameters are optimized; modulation method details are fine-tuned to improve signal demodulation success rate; after all parameters are adjusted, communication quality changes before and after adjustment are recorded in real time.

[0031] It should be noted that the order of the above embodiments of the present invention is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. Furthermore, the above description focuses on specific embodiments of this specification. Additionally, the processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired results. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0032] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An adaptive communication method for automotive digital keys compatible with multiple interconnection standards, characterized in that, include: After the car digital key is started, the communication module is initialized, a pre-set library of multiple interconnection standard configurations is loaded, and multi-band detection signals are sent to the outside world based on the initialized communication module. Feedback signals are captured in real time and signal features are extracted. Accessible car-end communication devices and interconnection standards supported by the devices are screened, a candidate interconnection standard set is generated, and the signal strength corresponding to each standard is recorded. Based on the acquired set of candidate interconnection standards and signal strength, the candidate interconnection standards are ranked according to signal stability, communication rate, power consumption level, security level and application scenario adaptability, and the interconnection standard with the highest priority is selected as the initial communication standard. The digital key calls the corresponding communication protocol parameters and authentication rules from the interconnection standard configuration library based on the initial communication standard to complete the two-way identity authentication between the vehicle-side communication device and the digital key and establish the initial communication link; The digital key monitors the status parameters of the communication link in real time, its own power consumption status, and changes in the communication requirements of the vehicle. It triggers a link status early warning mechanism by setting status thresholds. When a link status warning is triggered or a change in vehicle-side communication requirements is detected, the adaptability of each candidate interconnection standard is reassessed based on the current communication status data, vehicle-side requirement instructions, and candidate interconnection standard set. Based on the recoverability of the current standard's abnormal state, parameter optimization or switching of interconnection standards is performed. The digital key transmits data based on the target interconnection standard parameters of the switch and uses a breakpoint resume mechanism. After the switch is completed, it sends a link reconnection request to the vehicle and performs identity authentication under the target interconnection standard. After the vehicle verifies the identity, a new communication link is established. During stable communication, the digital key dynamically adjusts the communication parameters of the current interconnection standard, periodically checks the update status of the interconnection standard configuration library, and closes the communication link and releases communication resources when the communication task is completed or a disconnection command is detected from the vehicle.

2. The adaptive communication method for a car digital key compatible with multiple interconnection standards according to claim 1, characterized in that, After the car digital key is activated, it initializes the communication module, loads a pre-set library of multiple interconnection standard configurations, sends multi-band detection signals based on the initialized communication module, captures feedback signals in real time and extracts signal features, filters accessible car-end communication devices and the interconnection standards supported by those devices, generates a candidate interconnection standard set, and records the signal strength corresponding to each standard. Specifically, this includes: After the car digital key is started, it performs the communication module initialization operation, completes the communication port reset, hardware driver loading and basic communication parameter configuration, and loads a variety of preset interconnection standard configuration libraries; Based on the communication module, a wide-spectrum scanning method is used to cover the communication frequency bands corresponding to each interconnection standard, and the signal receiving channel is opened to capture surrounding feedback signals in real time. The system performs signal strength detection, frequency band identification, and signal feature extraction on the feedback signal, filters out valid signals carrying vehicle-side communication identifiers, obtains the accessible vehicle-side communication devices and the set of candidate interconnection standards supported by the devices, generates a candidate standard list, and records the signal strength parameters corresponding to each standard.

3. The adaptive communication method for a car digital key compatible with multiple interconnection standards according to claim 1, characterized in that, The process of ranking the candidate interconnection standards based on the acquired set of candidate interconnection standards and signal strength, combined with signal stability, communication rate, power consumption level, security level, and application scenario adaptability, and selecting the interconnection standard with the highest priority as the initial communication standard specifically includes: Based on the acquired candidate interconnection standard set, the measured index data corresponding to each standard are collected; Based on the default weights: security level 30%, signal stability 25%, communication rate 20%, power consumption level 15%, and scenario adaptability 10%, the indicator data of each candidate standard are weighted and summed to obtain the comprehensive score of each standard. Candidate standards are ranked based on comprehensive scores, a priority sequence is generated and each standard score is labeled, and the standard with the highest score is selected as the initial communication standard.

4. The adaptive communication method for a car digital key compatible with multiple interconnection standards according to claim 1, characterized in that, The digital key, based on the initial communication standard, calls the corresponding communication protocol parameters and authentication rules from the interconnection standard configuration library to complete the two-way identity authentication between the vehicle-side communication device and the digital key and establish the initial communication link, specifically including: Based on the initial communication standard, the corresponding complete protocol parameters are retrieved from the Internet standard configuration library, including physical layer transmission rate, data link layer frame structure, check bit algorithm and authentication port number; Send a link connection request to the vehicle's communication device, including digital key identification information, initial standard identifier, and authentication start command; After receiving the connection request, the vehicle sends out authentication challenge information and generates authentication response information using a hybrid encryption mechanism; After the vehicle verifies the response information and returns a link establishment confirmation message, the two-way identity authentication is completed and the initial communication link is established.

5. The adaptive communication method for a car digital key compatible with multiple interconnection standards according to claim 1, characterized in that, The digital key monitors the status parameters of the communication link in real time, its own power consumption, and changes in the communication requirements of the vehicle. It triggers a link status early warning mechanism by setting status thresholds, specifically including: Digital keys monitor key status parameters of communication links in real time, including signal strength, data transmission rate, bit error rate, latency, and link connection stability. Real-time acquisition of power supply current and voltage of each communication module of the digital key, calculation of real-time power consumption, monitoring of demand commands sent by the vehicle, parsing command types to determine changes in communication demand; By setting a status threshold, the collected parameters are compared with the threshold of the corresponding standard. If any parameter exceeds the threshold twice in a row, a link warning is triggered. The warning type, abnormal parameter value, trigger time, and current communication standard information are written to a temporary log buffer, and the log data includes a timestamp.

6. The adaptive communication method for a car digital key compatible with multiple interconnection standards according to claim 1, characterized in that, When a link status warning is triggered or a change in vehicle-side communication requirements is detected, the compatibility of each candidate interconnection standard is reassessed based on the current communication status data, vehicle-side requirement commands, and candidate interconnection standard set. Based on the recoverability of the current standard's abnormal state, parameter optimization or switching of interconnection standards is performed. This specifically includes: When a link status warning is triggered or a change in vehicle-side communication requirements is detected, if it is a parameter anomaly warning, the type of abnormal parameter, the threshold range exceeded, and the duration are extracted; if it is a requirement change, the instruction type and the corresponding communication requirement indicators are identified. The parameter adjustment threshold of the current communication standard is called to determine whether abnormal parameters can be repaired through dynamic adjustment. If they can be repaired, a parameter adjustment plan is generated, and the parameters are monitored to see if they return to the normal range after adjustment. If the problem cannot be repaired, the comprehensive score of each candidate standard will be recalculated based on the current communication status data, demand indicators and candidate interconnection standard set, and the target switching standard with the best adaptability will be selected. Based on the target switching standard, the communication parameters of the target standard are called from the interconnection standard configuration library to complete the parameter pre-configuration and communication module status reset before the switch.

7. The adaptive communication method for a car digital key compatible with multiple interconnection standards according to claim 1, characterized in that, The digital key transmits data based on the target interconnection standard parameters during the switch, using a breakpoint resume mechanism. After the switch is complete, it sends a link reconnection request to the vehicle, performs identity authentication under the target interconnection standard, and establishes a new communication link after successful verification at the vehicle. Specifically, this includes: Based on the protocol parameters of the target standard, a temporary link connection request is sent to the vehicle, and the continuity of data transmission is maintained through the breakpoint resume mechanism. After data synchronization is complete, a notification of the original link being disconnected is sent to the vehicle. After receiving a disconnection confirmation response from the vehicle, the communication resources occupied by the original link are released. Send an authentication request to the vehicle and receive a successful authentication response from the vehicle. Establish a formal target standard communication link, record the new link parameters and mark the switch as successful. If authentication fails or link establishment fails, try to restore the original communication link first. If the original link is unavailable, re-execute the candidate interconnection standard screening and switching process.

8. The adaptive communication method for a car digital key compatible with multiple interconnection standards according to claim 1, characterized in that, During the stable communication process, the digital key dynamically adjusts the communication parameters of the current interconnection standard, periodically checks the update status of the interconnection standard configuration library, and closes the communication link and releases communication resources when the communication task is completed or a disconnection command is detected from the vehicle. Specifically, this includes: Real-time collection of historical data of the current communication link, combined with the current application scenario to construct a parameter optimization analysis dataset, and adjustment of communication parameters through adaptive optimization strategies; Regularly check the update status of the interconnected standard configuration library. If a standard update package pushed by the cloud server is detected, the update package will be downloaded and the configuration library will be synchronized and updated in the background without interrupting the current communication. When the communication task is completed or a disconnection command is detected from the vehicle, the communication link is closed, communication resources are released, and the communication process is completed.

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