Method for accessing mobile phone shell to mobile internet

Abstract

The invention discloses a method for accessing a mobile phone shell to a mobile internet, which relates to the technical field of mobile communication, and comprises the following steps of: installing a mobile terminal into a protective shell, and realizing physical connection with the mobile terminal through a bottom interface of the protective shell; after the physical connection is successful, the mobile terminal supplies power to a multi-band communication module arranged in the protective shell and sends an identification instruction, and after the identification is passed, the mobile terminal is connected with the multi-band communication module; and the mobile terminal is connected with the multi-band communication module. According to the method for accessing the mobile phone shell to the mobile internet, the mobile phone shell is combined with the mobile terminal, integration of a multi-band communication module is achieved, a user can easily access the mobile internet without carrying extra MIFI equipment, the carrying burden and the management cost are reduced, and meanwhile, the user experience is improved. The multi-band communication module in the mobile phone shell can automatically scan, evaluate and select the optimal network band for connection, so that the stability and speed of network connection are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of mobile communications, and in particular to a method for connecting a mobile phone case to the mobile Internet. Background Art

[0002] To address this challenge, MIFI devices have emerged on the market. These devices allow users to connect to the Internet via Wi-Fi without changing their phone numbers. While MIFI devices alleviate users' data traffic demands to some extent, as external devices, they not only increase the burden on users to carry around, but also bring additional management costs, such as monitoring and charging the device's battery. These issues limit the convenience and practicality of MIFI devices, making some users cautious when choosing them. To address this issue, we propose a method for connecting mobile phone cases to the mobile Internet. Summary of the Invention

[0003] In order to solve the above technical problems, a method for connecting a mobile phone case to the mobile Internet is provided. This technical solution solves the above problems.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0005] A method for connecting a mobile phone case to the mobile Internet, comprising:

[0006] Place the mobile terminal in the protective case and physically connect it to the mobile terminal through the interface at the bottom of the protective case;

[0007] After the physical connection is successful, the mobile terminal supplies power to the multi-band communication module built into the protective case and sends an identification command. After the identification is successful, the mobile terminal and the multi-band communication module are connected;

[0008] After the mobile terminal is connected to the multi-band communication module, the communication module starts to scan the surrounding network environment and obtains several network frequency band signal information;

[0009] Based on the obtained network frequency band signal information, the mobile terminal evaluates all network frequency band signal information and selects the optimal network frequency band in the current network environment for connection;

[0010] After the network connection is completed, the network environment is regularly evaluated according to the user's preset instructions to determine whether the currently connected network is the best. If there is a frequency band that is better than the current network, the current network will be automatically switched.

[0011] Preferably, the protective case is inspected before the mobile terminal is placed in the protective case to ensure that the interface at the bottom of the protective case is not damaged and that the multi-band communication module is working properly;

[0012] Among them, the method for detecting the protective case is:

[0013] Use testing equipment to test the electrical connectivity of the interface at the bottom of the protective case. If the test resistance is within the preset range, the interface is considered undamaged. Send a test signal to the multi-band communication module. If a correct response signal is received, the multi-band communication module is considered to be functioning properly.

[0014] Among them, the interface resistance detection formula is:

[0015]

[0016] Where R represents the interface resistance, U represents the voltage applied across the interface, and I represents the current passing through the interface.

[0017] The calculation formula for the response signal strength is:

[0018]

[0019] Where S represents the response signal strength, P represents the received response signal power, and A represents the receiving area.

[0020] Preferably, sending the identification instruction, after the identification is passed, the mobile terminal and the multi-band communication module complete the connection specifically including:

[0021] After the physical connection is successful, the mobile terminal outputs the power supply voltage to the multi-band communication module built into the protective case through the connection line according to its hardware design specifications;

[0022] The communication module enters the waiting state, and some basic circuits of the communication module start working;

[0023] The mobile terminal sends an identification instruction data packet to the multi-band communication module through a pre-set communication protocol, and the multi-band communication module built into the protective shell decrypts and verifies the information;

[0024] The expression for identifying instruction data packets is:

[0025] C=E(K,P)

[0026] In the formula, C represents the encrypted identification instruction data, E represents the encryption function, K represents the key, and P represents the plaintext information;

[0027] Among them, the decryption verification expression is:

[0028] P=D(K,C)

[0029] Where D represents the decryption function;

[0030] After the multi-band communication module completes the decryption verification, it sends a connection confirmation message to the mobile terminal;

[0031] After receiving the connection confirmation message, the mobile terminal completes the establishment of a connection with the multi-band communication module at its own software and hardware levels.

[0032] Preferably, the communication module is started to scan the surrounding network environment, and obtains several network frequency band signal information, specifically including:

[0033] After the mobile terminal is connected to the multi-band communication module in the protective shell, the mobile terminal sends a start scanning instruction to the communication module through the connection channel. The scanning instruction includes: a scanning frequency band range and a scanning signal strength threshold;

[0034] After receiving the instruction, the microcontroller of the communication module configures the internal RF circuit according to the instruction. At each scanning frequency point, the RF circuit detects whether there is a signal that meets the communication protocol. When a signal that meets the protocol characteristics is detected, the RF front end performs preliminary filtering and amplification on the signal.

[0035] The processed signal is transmitted to the baseband chip inside the communication module. The baseband chip demodulates and decodes the signal to obtain key information in the signal, such as the service set identifier, signal strength, frequency band, and encryption method of the Wi-Fi signal, and the network operator information, cell ID, signal strength, and frequency band information of the cellular network signal.

[0036] The communication module stores each extracted network frequency band signal information in an internal buffer area, sorts the stored data to remove duplicate information, and after sorting is completed, transmits the sorted network frequency band signal information to the mobile terminal through the physical connection interface;

[0037] After receiving the data, the mobile terminal stores it in its own memory, ready for evaluation.

[0038] Preferably, when the communication module scans the surrounding network environment, the scanning frequency is adjusted according to the stability of the network environment;

[0039] When the network environment is unstable, increase the scanning frequency; when the network environment is stable, reduce the scanning frequency;

[0040] The scanning frequency adjustment formula is:

[0041] f=α×Q+β

[0042] Where f represents the scanning frequency, α and β represent adjustment coefficients, and W represents the network stability parameter, which is determined by monitoring the fluctuation of network signal strength.

[0043] Preferably, evaluating the signal information of all network frequency bands by the mobile terminal specifically includes:

[0044] The mobile terminal receives a plurality of network frequency band signal information transmitted by the multi-band communication module, including signal strength, frequency band, and network operator of different network types, classifies and organizes this information, and evaluates signal strength, network stability, and network speed respectively;

[0045] Signal strength assessment: Wi-Fi signals use the received signal strength indicator to measure signal strength, while cellular networks use reference signal received power and reference signal received quality to measure signal strength.

[0046] Network stability assessment: Wi-Fi networks count the number of signal disconnections and reconnections within a certain period of time, while cellular networks observe the frequency of base station switching.

[0047] Network speed assessment: This is done by sending test packets and measuring the response time. The mobile terminal sends a packet to a known server and measures the time from sending to receiving the response. The network speed is determined by the response time.

[0048] Comprehensively evaluate Wi-Fi and cellular network signals based on signal strength, network stability, and network speed;

[0049] The Wi-Fi signal comprehensive score calculation formula is:

[0050] score wi-fi =RSSI score ×w strength +stability score ×w stability +speed score ×w speed

[0051] In the formula, score wi-fi Indicates the comprehensive score of Wi-Fi signal, RSSI score Indicates the signal strength score, wstrength Indicates the weight of signal strength, stability score represents the network stability score, w stability Indicates the weight of network stability, speed score Indicates the network speed score, w speed The weight representing the network speed;

[0052] The calculation formula for the comprehensive score of cellular network signals is:

[0053] score cellular =RSRP score ×w strength +RSRQ score ×w quality +stability score ×w stability

[0054] +speed score ×w speed

[0055] In the formula, score cellular Indicates the comprehensive score of cellular network signal, RSRP score Indicates signal strength score, RSRQ score Indicates the signal quality score, w quality The weight representing the signal quality.

[0056] Preferably, the time interval for regularly evaluating the network environment can be set by the user;

[0057] The calculation formula for the evaluation time interval is:

[0058] t=γ×N+δ

[0059] Where t represents the time interval, γ and δ represent coefficients, and N represents the parameter value set by the user.

[0060] Preferably, when automatically switching networks, if a network interruption occurs during the switching process, the mobile terminal needs to record the interruption time and cause, and send a notification to the user after the network is restored.

[0061] Preferably, the multi-band communication module built into the protective case can support multiple network standards, including but not limited to 4G, 5G and Wi-Fi. The communication module automatically selects the optimal network standard for connection according to the network environment.

[0062] Preferably, after the network connection is completed, if the mobile terminal detects that the network signal strength is lower than a preset threshold, a network optimization program is automatically started, and the network optimization program includes: adjusting parameters of the communication module and switching network frequency bands;

[0063] T 阈 =μ×S max

[0064] Where, T 阈 represents the threshold, μ represents the coefficient, S max Indicates the highest signal strength in history.

[0065] Compared with the prior art, the present invention has the following beneficial effects:

[0066] The method for connecting a mobile phone case to the mobile internet proposed in the present invention integrates a multi-band communication module by combining the mobile phone case with a mobile terminal. This allows users to easily access the mobile internet without having to carry an additional MIFI device, reducing the burden of carrying and management costs. Furthermore, the multi-band communication module within the mobile phone case can automatically scan, evaluate, and select the optimal network frequency band for connection, ensuring the stability and speed of the network connection and improving the user's mobile internet experience. This allows users to access more economical and higher-quality mobile internet services through the mobile phone case while retaining their original mobile phone number. This solves the financial pressure users face due to high data costs while enjoying the convenience of mobile internet. The method can regularly evaluate the network environment and automatically switch to the optimal network frequency band, ensuring that users are always connected to the best network, providing users with a more convenient, economical, secure, and efficient mobile internet experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 Flow chart of the method of the present invention. DETAILED DESCRIPTION

[0068] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0069] Reference Figure 1 As shown, a method for connecting a mobile phone case to the mobile Internet includes:

[0070] When the mobile terminal is placed in the protective case, the connector on the bottom of the case will physically connect to the mobile terminal. This physical connection process is crucial as it lays the foundation for subsequent operations. Once the physical connection is successful, the mobile terminal will supply power to the multi-band communication module built into the protective case. This acts as a stimulant to the communication module, enabling it to function properly. Simultaneously, the mobile terminal will send an identification command. Only after successful identification can the mobile terminal and the multi-band communication module establish a connection. This connection process must be performed accurately to ensure smooth subsequent network connections.

[0071] Once the mobile terminal is connected to the multi-band communication module, the module activates. It conducts a comprehensive scan of the surrounding network environment, acting like a sensitive detector, detecting every network frequency signal. Through this scan, the module acquires information about multiple network frequency signals. This information includes the characteristics and strength of different network frequency bands.

[0072] Based on the acquired network frequency signal information, the mobile terminal will use its powerful processing capabilities to evaluate all network frequency signal information. This evaluation process takes into account multiple factors such as signal strength, stability, and speed to select the optimal network frequency band for connection in the current network environment. This ensures that users can enjoy the best network experience.

[0073] Once a network connection is established, the system will periodically evaluate the network environment according to user-defined instructions. This evaluation is ongoing to determine whether the currently connected network is still optimal. If a superior frequency band is found during the evaluation, the system will automatically switch to the current network. This ensures that users are always connected to the optimal network and enjoy high-quality mobile internet services at all times.

[0074] Before placing your mobile device in a protective case, it's necessary to thoroughly inspect the case to ensure it functions properly. This step is crucial because subsequent connections and network usage can only proceed smoothly if the bottom connectors are intact and the multi-band communication module is functioning properly.

[0075] First, we use specialized testing equipment to test the electrical connectivity of the connector on the bottom of the case. The equipment measures the resistance of the connector. If the resistance is within a preset range, the connector is considered undamaged. This range is carefully chosen to account for the normal resistance and tolerance of the connector. If the resistance exceeds this range, the connector is damaged or has poor contact, requiring further inspection and repair.

[0076] Secondly, the multi-band communication module is tested by sending a test signal to it. After sending the test signal, if a correct response signal is received, it can be determined that the multi-band communication module is working properly. This test signal can simulate actual network signals or commands to test the communication module's reception and processing capabilities. If a correct response signal is not received, it means that the communication module is faulty and needs to be repaired or replaced.

[0077] Among them, the interface resistance detection formula is:

[0078]

[0079] Where R represents the interface resistance, U represents the voltage applied across the interface, and I represents the current passing through the interface.

[0080] The calculation formula for the response signal strength is:

[0081]

[0082] Where S represents the response signal strength, P represents the received response signal power, and A represents the receiving area.

[0083] Send the identification command. After the identification is passed, the mobile terminal and the multi-band communication module complete the connection, which specifically includes:

[0084] After a successful physical connection, the mobile terminal will operate strictly in accordance with its own hardware design specifications. Specifically, the mobile terminal will output a stable power supply voltage to the multi-band communication module built into the protective case through the connection line. This power supply process is like injecting a source of energy into the communication module, allowing the communication module to gradually wake up from its initial dormant state and enter the ready-to-activate state. In the ready-to-activate state, some basic circuits of the communication module begin to work in an orderly manner, preparing for the subsequent identification and connection process.

[0085] Next, the mobile terminal will send a carefully constructed identification instruction data packet to the multi-band communication module according to the pre-set communication protocol. This data packet contains specific identification information for the communication module to confirm the identity of the mobile terminal and the connection request. After receiving this data packet, the multi-band communication module built into the protective case will quickly decrypt and verify the information in it. This decryption and verification process is like opening a mysterious door that can only be entered with the correct key. The communication module will use its built-in security algorithm and key to carefully analyze and verify the information in the data packet to ensure the security and legitimacy of the connection;

[0086] The expression for identifying instruction data packets is:

[0087] C=E(K,P)

[0088] In the formula, C represents the encrypted identification instruction data, E represents the encryption function, K represents the key, and P represents the plaintext information;

[0089] Among them, the decryption verification expression is:

[0090] P=D(K,C)

[0091] Where D represents the decryption function;

[0092] Once the multi-band communication module completes decryption and verification, it immediately sends a connection confirmation message to the mobile terminal. This message acts as a friendly response, telling the mobile terminal that it is ready to establish a connection. Upon receiving this connection confirmation message, the mobile terminal performs a complex series of operations simultaneously at both the software and hardware levels to establish a connection with the multi-band communication module. At the software level, the mobile terminal updates the relevant driver and configuration information to ensure effective communication with the communication module. At the hardware level, the mobile terminal adjusts the connection line status and parameters to ensure stable data transmission. Through these carefully designed steps, the mobile terminal and the multi-band communication module are finally successfully connected, providing users with convenient mobile internet access services.

[0093] The communication module starts and scans the surrounding network environment, obtaining several network frequency band signal information, including:

[0094] Once the mobile terminal connects to the multi-band communication module inside the protective case, it sends a scan start command to the module through the connection channel. This scan command includes important parameters, including the scanning frequency range and the signal strength threshold. The scanning frequency range determines the frequency range within which the communication module searches, while the signal strength threshold is used to select a sufficiently strong signal to ensure subsequent connection quality.

[0095] Upon receiving the command, the communication module's microcontroller immediately configures its internal RF circuitry accordingly. The RF circuitry acts as the module's "eyes" and "ears," sensing surrounding electromagnetic signals. At each scanned frequency, the RF circuitry carefully checks for signals that meet the communication protocol. If a signal meeting the protocol characteristics is detected, the RF front-end performs preliminary filtering and amplification. This process acts as a preliminary screening and enhancement of the signal, removing any interference and increasing signal strength.

[0096] After being processed by the RF front-end, the signal is transmitted to the baseband chip inside the communication module. The baseband chip acts as the "brain" of the communication module, responsible for in-depth signal analysis and decoding. The baseband chip demodulates and decodes the signal to obtain key information from the signal. For Wi-Fi signals, this key information includes the service set identifier (SSID), signal strength, frequency band, and encryption method. The SSID helps users identify different Wi-Fi networks, signal strength reflects the network's coverage and quality, the frequency band determines the network's transmission speed and stability, and the encryption method ensures network security. For cellular network signals, key information includes network operator information, cell ID, signal strength, and frequency band information. This information helps users understand their current network environment and select the most suitable network for connection.

[0097] The communication module stores each extracted network frequency band signal information in an internal cache. This cache acts as a temporary warehouse for the scanned signal information. During data storage, the communication module organizes the stored data and removes duplicate information. This prevents duplicate data from taking up excessive storage space and improves the efficiency of subsequent evaluation. Once organized, the communication module transmits the organized network frequency band signal information to the mobile terminal via a physical connection interface.

[0098] After receiving data, the mobile terminal stores it in its memory. This memory acts as a "database" for the mobile terminal, storing various data and information. The mobile terminal stores the received network frequency signal information in memory, preparing for evaluation. This evaluation process selects the optimal network frequency band for connection based on user needs and a pre-set algorithm, providing the best mobile internet experience.

[0099] When the communication module scans the surrounding network environment, its scanning frequency is not fixed but dynamically adjusted based on the stability of the network environment. This design aims to optimize the scanning process, improve the efficiency and performance of the communication module, and also help reduce unnecessary energy consumption.

[0100] When the network environment is unstable, the communication module increases its scanning frequency. This is because in an unstable network environment, network signals frequently change, and signal strength and quality fluctuate significantly. To promptly capture these changes and find a more stable and reliable network frequency band, the communication module needs to scan more frequently. Increasing the scanning frequency allows the communication module to detect new network signals more quickly and adjust its connection strategy accordingly, ensuring that users always have a good network connection.

[0101] Conversely, when the network environment is stable, the communication module reduces the scanning frequency. In a stable network environment, network signal fluctuations are relatively rare, and signal strength and quality are relatively stable. In this case, frequent scanning is not only unnecessary but also wastes energy and computing resources. Reducing the scanning frequency allows the communication module to reduce unnecessary scanning operations while maintaining a stable network connection, thereby reducing energy consumption and extending the device's lifespan.

[0102] In short, the design of the communication module adjusting the scanning frequency according to the stability of the network environment can achieve the best scanning effect under different network conditions, providing users with a more stable and efficient mobile Internet connection experience;

[0103] The scanning frequency adjustment formula is:

[0104] f=α×Q+β

[0105] Where f represents the scanning frequency, α and β represent adjustment coefficients, and W represents the network stability parameter, which is determined by monitoring the fluctuation of network signal strength.

[0106] The usage process of the present invention is as follows: the mobile terminal is placed in the protective shell and a physical connection is achieved through the bottom interface; the mobile terminal is powered and sends an identification instruction to the multi-band communication module in the protective shell to complete the connection; the communication module is started, scans the network environment, and obtains network frequency band signal information; the mobile terminal evaluates the network frequency band information and selects the optimal frequency band for connection; according to user instructions, the network environment is regularly evaluated and automatically switched to a more optimal frequency band.

[0107] To sum up, the advantages of the present invention are: combining the mobile phone case with the mobile terminal and integrating a multi-band communication module. Users can access the mobile Internet without carrying an additional MIFI device, reducing the burden and management costs. The module inside the mobile phone case can automatically scan, evaluate and select the optimal network frequency band for connection, ensuring network stability and speed, and improving user experience. Users can access more economical and high-quality services while keeping their original mobile phone number unchanged, solving the economic pressure brought by high traffic fees. This method can regularly evaluate the network environment and automatically switch to the optimal frequency band, bringing users a convenient, economical, safe and efficient mobile Internet experience.

[0108] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for connecting a mobile phone case to the mobile Internet, characterized in that: include: Place the mobile terminal in the protective case and physically connect the mobile terminal to the protective case through the interface at the bottom of the protective case; After the physical connection is successful, the mobile terminal supplies power to the multi-band communication module built into the protective shell and sends an identification command. After the identification is successful, the mobile terminal and the multi-band communication module are connected; After the mobile terminal is connected to the multi-band communication module, the communication module starts to scan the surrounding network environment and obtains several network frequency band signal information; Based on the obtained network frequency band signal information, the mobile terminal evaluates all network frequency band signal information and selects the best network frequency band in the current network environment for connection; After the network connection is completed, the network environment is evaluated regularly according to the user's preset instructions to determine whether the currently connected network is the best. If there is a frequency band that is better than the current network, the current network will be automatically switched.

2. A method for connecting a mobile phone case to the mobile Internet according to claim 1, characterized in that: Before placing the mobile terminal in the protective case, inspect the protective case to ensure that the interface at the bottom of the protective case is not damaged and the multi-band communication module is working properly; Among them, the method for detecting the protective shell is: Use the detection equipment to test the electrical connectivity of the interface at the bottom of the protective case. If the test resistance is within the preset range, it is determined that the interface is not damaged. Send a test signal to the multi-band communication module. If a correct response signal is received, it is determined that the multi-band communication module is working properly. Among them, the interface resistance detection formula is: In the formula, R represents the interface resistance, U represents the voltage applied to both ends of the interface, and I represents the current passing through the interface; Among them, the calculation formula of the response signal strength is: In the formula, S represents the response signal strength, P represents the received response signal power, and A represents the receiving area.

3. A method for connecting a mobile phone case to the mobile Internet according to claim 1, characterized in that: Send the identification command. After the identification is passed, the mobile terminal and the multi-band communication module complete the connection, which specifically includes: After the physical connection is successful, the mobile terminal outputs the power supply voltage to the multi-band communication module built into the protective shell through the connection line according to its hardware design specifications; The communication module enters the waiting state, and some basic circuits of the communication module start working; The mobile terminal sends an identification command data packet to the multi-band communication module through a pre-set communication protocol, and the multi-band communication module built into the protective shell decrypts and verifies the information; Among them, the expression for identifying instruction data packets is: C=E(K,P) In the formula, C represents the encrypted identification instruction data, E represents the encryption function, K represents the key, and P represents the plaintext information; The decryption verification expression is: P=D(K,C) In the formula, D represents the decryption function; After the multi-band communication module completes the decryption verification, it sends a connection confirmation message to the mobile terminal; After receiving the connection confirmation message, the mobile terminal completes the establishment of a connection with the multi-band communication module at its own software level and hardware level.

4. A method for connecting a mobile phone case to the mobile Internet according to claim 1, characterized in that: The communication module starts to scan the surrounding network environment and obtains several network frequency band signal information, including: After the mobile terminal is connected to the multi-band communication module in the protective shell, the mobile terminal sends a start scanning instruction to the communication module through the connection channel, and the scanning instruction includes: a scanning frequency band range and a scanning signal strength threshold; After receiving the instruction, the microcontroller of the communication module configures the internal RF circuit according to the instruction. At each scanning frequency point, the RF circuit detects whether there is a signal that meets the communication protocol. When a signal that meets the protocol characteristics is detected, the RF front end performs preliminary filtering and amplification processing on the signal; The processed signal is transmitted to the baseband chip inside the communication module, and the baseband chip demodulates and decodes the signal to obtain key information in the signal, including: service set identifier, signal strength, frequency band and encryption method of Wi-Fi signal, and network operator information, cell ID, signal strength and frequency band information of cellular network signal; The communication module stores each extracted network frequency band signal information in an internal buffer area, sorts the stored data to remove duplicate information, and after sorting is completed, transmits the sorted network frequency band signal information to the mobile terminal through the physical connection interface; After receiving the data, the mobile terminal stores it in its own memory, ready for evaluation.

5. A method for connecting a mobile phone case to the mobile Internet according to claim 4, characterized in that: When the communication module scans the surrounding network environment, the scanning frequency is adjusted according to the stability of the network environment; When the network environment is unstable, increase the scanning frequency, and when the network environment is stable, reduce the scanning frequency; The scanning frequency adjustment formula is: f=α×Q+β Wherein, f represents the scanning frequency, α and β represent the adjustment coefficients, and W represents the network stability parameter, which is determined by monitoring the fluctuation of the network signal strength.

6. A method for connecting a mobile phone case to the mobile Internet according to claim 1, characterized in that: The evaluation of all network frequency band signal information through mobile terminals specifically includes: The mobile terminal receives a number of network frequency band signal information transmitted by the multi-band communication module, the information including: signal strength, frequency band and network operator of different network types, classifies and organizes the information, and evaluates the signal strength, network stability and network speed respectively; Signal strength assessment: Wi-Fi signals use the received signal strength indicator to measure signal strength, while cellular networks use the reference signal received power and reference signal received quality to measure signal strength; Network stability assessment: Wi-Fi networks count the number of times the signal is disconnected and reconnected within a certain period of time, and cellular networks observe the frequency of switching base stations; Network speed assessment: The network speed is assessed by sending a test data packet and measuring the response time. The mobile terminal sends a data packet to a known server and measures the time from sending to receiving the response. The network speed is judged based on the length of the response time. Comprehensively evaluate Wi-Fi and cellular network signals based on signal strength, network stability, and network speed; The calculation formula for the Wi-Fi signal comprehensive score is: score wi-fi =RSSI score ×w strength +stability score ×w stability +speed score ×w speed In the formula, score wi-fi Indicates the comprehensive score of Wi-Fi signal, RSSI score Indicates the signal strength score, w strength Indicates the weight of signal strength, stability score represents the network stability score, w stability Indicates the weight of network stability, speed score Indicates the network speed score, w speed The weight representing the network speed; The calculation formula for the comprehensive score of cellular network signals is: score cellular =RSRP score ×w strength +RSRQ score ×w quality +stability score ×w stability +speed score ×w speed In the formula, score cellular Represents the comprehensive score of cellular network signal, RSRP score Indicates the signal strength score, RSRQ score represents the signal quality score, w quality A weight that represents the signal quality.

7. A method for connecting a mobile phone case to the mobile Internet according to claim 1, characterized in that: The time interval for regular network environment assessment can be set by the user; The calculation formula for the evaluation time interval is: t=γ×N+δ Where t represents the time interval, γ and δ represent coefficients, and N represents the parameter value set by the user.

8. The method for connecting a mobile phone case to the mobile Internet according to claim 1, characterized in that: When automatically switching networks, if a network interruption occurs during the switching process, the mobile terminal needs to record the interruption time and reason, and send a notification to the user after the network is restored.

9. A method for connecting a mobile phone case to the mobile Internet according to claim 1, characterized in that: The multi-band communication module built into the protective case can support multiple network standards, including but not limited to 4G, 5G and Wi-Fi. The communication module automatically selects the optimal network standard for connection according to the network environment.

10. The method for connecting a mobile phone case to the mobile Internet according to claim 1, characterized in that: After the network connection is completed, if the mobile terminal detects that the network signal strength is lower than a preset threshold, the network optimization program is automatically started, and the network optimization program includes: adjusting the parameters of the communication module and switching the network frequency band; T 阈 =μ×S max Where, T 阈 represents the threshold, μ represents the coefficient, S max Indicates the highest signal strength in history.

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