A multi-network cellular network intelligent switching system and method

Abstract

The present invention proposes a multi-network cellular network intelligent switching system and method, which relates to the technical field of data communication, including a multi-network converged intelligent SIM card and a cloud platform. The multi-network converged intelligent SIM card is provided with a micro control unit MCU, a multi-network switching circuit and an IO interface. The micro control unit MCU is respectively connected to the multi-network switching circuit and the IO interface. After the multi-network converged intelligent SIM card is inserted into a terminal device, the micro control unit MCU of the multi-network converged intelligent SIM card obtains network service data of the terminal device through the IO interface, parses and processes the network service data, and obtains the network strength of the terminal device. The micro control unit MCU also obtains a card switching instruction issued by the cloud platform through the IO interface. The micro control unit MCU controls the multi-network switching circuit to execute automatic card switching according to the network strength or the card switching instruction, thereby completing the multi-network cellular network intelligent switching.

Description

Technical Field

[0001] The present invention relates to the technical field of data communication, and in particular to a multi-network cellular network intelligent switching system and method. Background Art

[0002] In recent years, with the continuous development and popularization of mobile network communication technology, the development of industrial Internet has been greatly promoted. Except for a small number of factories with fixed access conditions, cellular networks are widely used in various industrial fields, such as asset tracking of industrial manufacturing equipment, monitoring of energy industry equipment, vehicle positioning and tracking in the logistics industry, etc. Cellular network is a mobile communication hardware architecture with the advantages of high reliability, wide coverage, support for multi-user access and high-speed data transmission. In the field of modern communications, cellular network has become an important communication technology.

[0003] With the rapid development of cellular network technology, smart terminal applications are becoming more and more deeply integrated into people's lives. By setting a SIM card in a smart terminal, it is possible to obtain services from the operator's network through the SIM card. Traditional smart terminals need to replace SIM cards to switch to different operators' networks, which requires users to prepare multiple SIM cards for use. To solve the above problems, three-in-one traffic cards have appeared on the market, which have achieved full network access for smart terminals. However, only some network communication giants are currently working on multi-network cellular network intelligent switching technology. The technology generally uses QFN5*6 patch cards of the three major operators, which are packaged twice and packaged into standard 3FF (size 12mm×15mm) or 4FF size (size 12mm×9mm) plug-in cards. Then, the local end of the device obtains effective network signals in real time to select cellular network communications with better signals. Instructions can also be sent to terminal applications through the platform. The terminal device and the platform use HTTP long connection to execute card cutting, but the three-in-one traffic card needs to be adapted to the Software Development Kit (Software Development Kit). Kit, SDK) application, and an application program must be implanted in the terminal device to determine the preconditions for card switching, which cannot achieve SIM card plug-and-play and real-time intelligent switching of multiple cellular networks. Summary of the invention

[0004] In order to solve the problems that the current multi-network cellular network intelligent switching technology cannot use SIM cards for plug-and-play and cannot intelligently switch multi-network cellular networks in real time, the present invention proposes a multi-network cellular network intelligent switching system and method, which realizes the plug-and-play of SIM cards and the real-time intelligent switching of multi-network cellular networks.

[0005] In order to achieve the above technical effects, the technical solution of the present invention is as follows:

[0006] A multi-network cellular network intelligent switching system, comprising:

[0007] A multi-network convergence smart SIM card and a cloud platform, wherein the multi-network convergence smart SIM card is provided with a microcontroller unit MCU, a multi-network switching circuit and an IO interface, wherein the microcontroller unit MCU is respectively connected to the multi-network switching circuit and the IO interface, and after the multi-network convergence smart SIM card is inserted into a terminal device, the microcontroller unit MCU of the multi-network convergence smart SIM card obtains network service data of the terminal device through the IO interface, parses and processes the network service data, and obtains the network strength of the terminal device, and the microcontroller unit MCU also obtains a card switching instruction issued by the cloud platform through the IO interface, and the microcontroller unit MCU controls the multi-network switching circuit to perform automatic card switching according to the network strength or the card switching instruction, thereby completing intelligent switching of multi-network cellular networks.

[0008] Preferably, the multi-network switching circuit includes a first SIM card switching circuit, a second SIM card switching circuit, a third SIM card switching circuit and a communication protocol circuit, and the micro control unit MCU is respectively connected to the first SIM card switching circuit, the second SIM card switching circuit, the third SIM card switching circuit and the communication protocol circuit.

[0009] Preferably, the first SIM card switching circuit is respectively connected to the VSSA pin, VDDA pin, PA0-WKUP pin and PA3 pin of the micro control unit MCU, the second SIM card switching circuit is respectively connected to the VDD_3 pin, PD2 pin, PA14-SWCLK pin, PA13-SWDIO pin, PA10 pin, PA9 pin and PC7 pin of the micro control unit MCU, the third SIM card switching circuit is respectively connected to the PB12 pin, VDD_1 pin and PB10 pin of the micro control unit MCU, and the communication protocol circuit is respectively connected to the PB0 pin, PB1 pin, PE7 pin, PE8 pin and PE9 pin of the micro control unit MCU.

[0010] Preferably, the first SIM card switching circuit includes a ground terminal, a chip power supply VDD_MCU, a clock signal interface SIM_CLK and a first circuit power supply VCC_SIM1, the ground terminal is connected to the VSSA pin of the micro control unit MCU, the chip power supply VDD_MCU is connected to the VDDA pin of the micro control unit MCU, the clock signal interface SIM_CLK is connected to the PA0-WKUP pin of the micro control unit MCU, and the first circuit power supply VCC_SIM1 is connected to the PA3 pin of the micro control unit MCU.

[0011] Preferably, the second SIM card switching circuit includes a chip power supply VDD_MCU, a PD2 interface, an MCU_PA4 / SWCLK interface, an MCU_PA13 / SWDIO interface, a programming power supply SIM_VPP_PA10, a SIM_DATA data interface and a second circuit power supply VCC_SIM2, the chip power supply VDD_MCU is connected to the VDD_3 pin of the micro control unit MCU, the PD2 interface is connected to the PD2 pin of the micro control unit MCU, the MCU_PA4 / SWCLK interface is connected to the PA14-SWCLK pin of the micro control unit MCU, the MCU_PA13 / SWDIO interface is connected to the PA13-SWDIO pin of the micro control unit MCU, the programming power supply SIM_VPP_PA10 is connected to the PA10 pin of the micro control unit MCU, the SIM_DATA data interface is connected to the PA9 pin of the micro control unit MCU, and the second circuit power supply VCC_SIM2 is connected to the PC7 pin of the micro control unit MCU.

[0012] Preferably, the third SIM card switching circuit includes a SIM_RST reset pin, a chip power supply VDD_MCU and a third circuit power supply VCC_SIM3, the SIM_RST reset pin is connected to the PB12 pin of the micro control unit MCU, the chip power supply VDD_MCU is connected to the VDD_1 pin of the micro control unit MCU, and the third circuit power supply VCC_SIM3 is connected to the PB10 pin of the micro control unit MCU.

[0013] Preferably, the communication protocol circuit includes a PB0 interface, a PB1 interface, a PE7 interface, a PE8_UART_TX transmitting interface, a transmitter TP_1 and a PE9_UART-RX receiving interface, the PB0 interface is connected to the PB0 pin of the micro control unit MCU, the PB1 interface is connected to the PB1 pin of the micro control unit MCU, the PE7 interface is connected to the PE7 pin of the micro control unit MCU, the PE8_UART_TX transmitting interface is respectively connected to the PE8 pin of the micro control unit MCU and the transmitter TP_1, and the PE9_UART-RX receiving interface is connected to the PE9 pin of the micro control unit MCU.

[0014] Preferably, the IO interface includes a SIM1_IO port, a SIM2_IO port and a SIM3_IO port, the SIM1_IO port is connected to the PA3 pin of the microcontroller unit MCU, the SIM2_IO port is connected to the PC8 pin of the microcontroller unit MCU, and the SIM3_IO port is connected to the PB10 pin of the microcontroller unit MCU.

[0015] Preferably, parsing the network service data specifically includes:

[0016] The microcontroller unit MCU interacts with the communication module of the terminal device, sends a data request to the communication module, and the communication module receives the data request and returns network service data of network status and network strength to the microcontroller unit MCU;

[0017] The micro control unit MCU confirms the network status by pinging the network delay, and analyzes the network strength through the measurement result to obtain the network strength of the terminal device.

[0018] The present invention proposes a multi-network cellular network intelligent switching method, which is implemented based on the multi-network cellular network intelligent switching system as described above, and includes the following steps:

[0019] S1. After the multi-network fusion smart SIM card microcontroller unit MCU is inserted into the multi-network fusion smart SIM card into the terminal device, the network service data of the terminal device is obtained through the IO interface;

[0020] S2. The microcontroller unit MCU parses and processes the network service data to obtain the network strength of the terminal device;

[0021] S3. The microcontroller unit MCU also obtains the card-cutting instruction issued by the cloud platform through the IO interface;

[0022] S4. The microcontroller unit MCU controls the multi-network switching circuit to perform automatic card switching according to the network strength or the card switching instruction, thereby completing intelligent switching of the multi-network cellular networks.

[0023] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0024] The present invention proposes a multi-network cellular network intelligent switching system and method. First, after the multi-network converged intelligent SIM card is inserted into the terminal device, the micro control unit MCU of the multi-network converged intelligent SIM card obtains the network service data of the terminal device through the IO interface, parses and processes the network service data, and obtains the network strength of the terminal device, thereby ensuring data security. The micro control unit MCU also obtains the card switching instruction issued by the cloud platform through the IO interface. The micro control unit MCU controls the multi-network switching circuit to perform automatic card switching according to the network strength or the card switching instruction, and completes the multi-network cellular network intelligent switching, so that the terminal device does not need to implant additional application programs and software development kits SDK, and realizes SIM card plug-and-play and real-time intelligent switching of multi-network cellular networks. The micro control unit MCU is used to increase the example parsing capability, increase the control power supply mode, reduce power consumption, and increase the binary SMS sending channel to reduce the terminal device operation resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1A structural diagram showing a multi-network cellular network intelligent switching system proposed in an embodiment of the present invention;

[0026] Figure 2 A diagram showing the effect of implementing a multi-network cellular network intelligent switching system proposed in an embodiment of the present invention;

[0027] Figure 3 A structural diagram showing a multi-network integration smart SIM card proposed in an embodiment of the present invention;

[0028] Figure 4 A flow chart showing a multi-network cellular network intelligent switching system proposed in Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0029] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0030] In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent actual sizes. The description of the directions of parts such as "upper" and "lower" does not limit the present patent;

[0031] It is understandable to those skilled in the art that some well-known contents may be omitted in the drawings;

[0032] The positional relationships described in the drawings are only for illustrative purposes and should not be construed as limiting the present patent.

[0033] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0034] Example 1

[0035] like Figure 1 As shown, this embodiment proposes a multi-network cellular network intelligent switching system, a multi-network converged smart SIM card 1 and a cloud platform 2, the multi-network converged smart SIM card 1 is provided with a micro control unit MCU11, a multi-network switching circuit 12 and an IO interface 13, the micro control unit MCU11 is respectively connected to the multi-network switching circuit 12 and the IO interface 13, after the multi-network converged smart SIM card 1 is inserted into the terminal device, the micro control unit MCU11 of the multi-network converged smart SIM card 1 obtains the network service data of the terminal device through the IO interface 13, parses and processes the network service data, and obtains the network strength of the terminal device, the micro control unit MCU11 also obtains the card switching instruction issued by the cloud platform 2 through the IO interface 13, and the micro control unit MCU11 controls the multi-network switching circuit 12 to perform automatic card switching according to the network strength or the card switching instruction, thereby completing the multi-network cellular network intelligent switching.

[0036] The communication module of the terminal device obtains the card cutting instruction issued by the cloud platform 2, and transmits it to the microcontroller unit MCU11 through the IO interface 13. The microcontroller unit MCU11 monitors the card cutting instruction information, parses the transmitted card cutting instruction according to the private protocol, and executes the card cutting. During the card cutting process, the multi-network integrated intelligent SIM card 1 sends an active command requesting the communication module to restart the multi-network integrated intelligent SIM card 1. The microcontroller unit MCU of the multi-network integrated intelligent SIM card 1 pulls up the corresponding SIM card IO to initialize the SIM card reading. After executing the card cutting, the card cutting event is actively reported through the BIP channel.

[0037] See also Figure 2 The cloud platform includes a CMP traffic platform and a CKP card cutting platform. The CMP traffic platform is used for card management, real-name authentication, package management and traffic management; the CKP card cutting platform is used for policy management and card cutting management;

[0038] The multi-network switching circuit 12 includes a first SIM card switching circuit 121, a second SIM card switching circuit 122, a third SIM card switching circuit 123 and a communication protocol circuit 124, and the micro control unit MCU11 is connected to the first SIM card switching circuit 121, the second SIM card switching circuit 122, the third SIM card switching circuit 123 and the communication protocol circuit 124 respectively.

[0039] Parsing and processing the network service data specifically includes:

[0040] The microcontroller unit MCU interacts with the communication module of the terminal device, sends a data request to the communication module, and the communication module receives the data request and returns network service data of network status and network strength to the microcontroller unit MCU;

[0041] The microcontroller unit MCU confirms the network status by pinging the network delay, and analyzes the network strength through the measurement result to obtain the network strength of the terminal device; the specific analysis process includes:

[0042] 1) The micro control unit MCU obtains the network status. If the network status is limited service or no service, the micro control unit MCU controls the multi-network switching circuit 12 to switch off the card; if the network status is normal service, the micro control unit MCU does not control the multi-network switching circuit 12 to switch off the card;

[0043] 2) The micro control unit MCU obtains the RSRP value (Reference Signal Received Power) of the network strength 9 times within 3 minutes. The RSRP value represents the physical quantitative index of the network strength. The RSRP value of the network strength obtained 9 times within 3 minutes is averaged to obtain a threshold value. If the threshold value is less than the judgment setting value -105dBm, dBm is the unit of network strength, the micro control unit MCU directly controls the multi-network switching circuit 12 to cut the card;

[0044] If the threshold is greater than the judgment setting value -105dBm, the network standard is judged. If the network standard satisfies 5G>4G, the micro control unit MCU does not control the multi-network switching circuit 12 to cut the card; if the network standard satisfies 3G or 2G, the micro control unit MCU controls the multi-network switching circuit 12 to cut the card;

[0045] The micro control unit MCU determines that the network status is normal service, the RSRP value is normal, and the network standard is normal, then the ping network delay is performed, specifically: the ping network delay detection time is set to 3 minutes, the ping network delay is detected every 30 seconds, the time average value of the ping network delay is calculated, and the time average value of the ping network delay is compared with the time setting value 10ms. If the ping network delay time is greater than the time setting value 10ms, the micro control unit MCU controls the multi-network switching circuit 12 to cut the card; if the ping network delay time is less than the time setting value 10ms, the micro control unit MCU does not control the multi-network switching circuit 12 to cut the card;

[0046] In this embodiment, first, after the multi-network convergence smart SIM card is inserted into the terminal device, the micro control unit MCU of the multi-network convergence smart SIM card obtains the network service data of the terminal device through the IO interface, parses and processes the network service data, and obtains the network strength of the terminal device, thereby ensuring data security. The micro control unit MCU also obtains the card cutting instruction issued by the cloud platform through the IO interface. The micro control unit MCU controls the multi-network switching circuit to execute automatic card cutting according to the network strength or the card cutting instruction, and completes the intelligent switching of multi-network cellular networks, so that the terminal device does not need to implant additional applications and software development kits SDK, realizes SIM card plug-and-play and real-time intelligent switching of multi-network cellular networks, and uses the micro control unit MCU to increase the example parsing capability, increase the control power supply mode, reduce power consumption, and increase the binary SMS sending channel to reduce the terminal device running resources.

[0047] Example 2

[0048] See also Figure 3The first SIM card switching circuit 121 is respectively connected to the VSSA pin, VDDA pin, PA0-WKUP pin and PA3 pin of the micro control unit MCU11, the second SIM card switching circuit 122 is respectively connected to the VDD_3 pin, PD2 pin, PA14-SWCLK pin, PA13-SWDIO pin, PA10 pin, PA9 pin and PC7 pin of the micro control unit MCU11, the third SIM card switching circuit 123 is respectively connected to the PB12 pin, VDD_1 pin and PB10 pin of the micro control unit MCU11, and the communication protocol circuit 124 is respectively connected to the PB0 pin, PB1 pin, PE7 pin, PE8 pin and PE9 pin of the micro control unit MCU11.

[0049] The first SIM card switching circuit 121 includes a ground terminal, a chip power supply VDD_MCU, a clock signal interface SIM_CLK and a first circuit power supply VCC_SIM1, the ground terminal is connected to the VSSA pin of the micro control unit MCU11, the chip power supply VDD_MCU is connected to the VDDA pin of the micro control unit MCU11, the clock signal interface SIM_CLK is connected to the PA0-WKUP pin of the micro control unit MCU11, and the first circuit power supply VCC_SIM1 is connected to the PA3 pin of the micro control unit MCU11.

[0050] The second SIM card switching circuit 122 includes a chip power supply VDD_MCU, a PD2 interface, an MCU_PA4 / SWCLK interface, an MCU_PA13 / SWDIO interface, a programming power supply SIM_VPP_PA10, a SIM_DATA data interface and a second circuit power supply VCC_SIM2. The chip power supply VDD_MCU is connected to the VDD_3 pin of the micro control unit MCU11, the PD2 interface is connected to the PD2 pin of the micro control unit MCU11, the MCU_PA4 / SWCLK interface is connected to the PA14-SWCLK pin of the micro control unit MCU11, the MCU_PA13 / SWDIO interface is connected to the PA13-SWDIO pin of the micro control unit MCU11, the programming power supply SIM_VPP_PA10 is connected to the PA10 pin of the micro control unit MCU11, the SIM_DATA data interface is connected to the PA9 pin of the micro control unit MCU11, and the second circuit power supply VCC_SIM2 is connected to the PC7 pin of the micro control unit MCU11.

[0051] The third SIM card switching circuit 123 includes a SIM_RST reset pin, a chip power supply VDD_MCU and a third circuit power supply VCC_SIM3, the SIM_RST reset pin is connected to the PB12 pin of the micro control unit MCU11, the chip power supply VDD_MCU is connected to the VDD_1 pin of the micro control unit MCU11, and the third circuit power supply VCC_SIM3 is connected to the PB10 pin of the micro control unit MCU11.

[0052] The communication protocol circuit 124 includes a PB0 interface, a PB1 interface, a PE7 interface, a PE8_UART_TX transmitting interface, a transmitter TP_1 and a PE9_UART-RX receiving interface. The PB0 interface is connected to the PB0 pin of the micro control unit MCU11, the PB1 interface is connected to the PB1 pin of the micro control unit MCU11, the PE7 interface is connected to the PE7 pin of the micro control unit MCU11, the PE8_UART_TX transmitting interface is respectively connected to the PE8 pin of the micro control unit MCU11 and the transmitter TP_1, and the PE9_UART-RX receiving interface is connected to the PE9 pin of the micro control unit MCU11.

[0053] The IO interface 13 includes a SIM1_IO port, a SIM2_IO port and a SIM3_IO port. The SIM1_IO port is connected to the PA3 pin of the microcontroller unit MCU11, the SIM2_IO port is connected to the PC8 pin of the microcontroller unit MCU11, and the SIM3_IO port is connected to the PB10 pin of the microcontroller unit MCU11.

[0054] Example 3

[0055] See also Figure 4 This embodiment proposes a multi-network cellular network intelligent switching method, which is implemented based on the multi-network cellular network intelligent switching system as described in the above embodiment, and includes the following steps:

[0056] S1. After the multi-network fusion smart SIM card 1 micro control unit MCU11 is inserted into the multi-network fusion smart SIM card 1 into the terminal device, the network service data of the terminal device is obtained through the IO interface 13;

[0057] S2. The microcontroller unit MCU11 parses and processes the network service data to obtain the network strength of the terminal device;

[0058] S3. The microcontroller unit MCU11 also obtains the card cutting instruction issued by the cloud platform 2 through the IO interface 13;

[0059] S4. The microcontroller unit MCU11 controls the multi-network switching circuit 12 to perform automatic card switching according to the network strength or the card switching instruction, thereby completing intelligent switching of the multi-network cellular networks.

[0060] In this embodiment, first, after the multi-network convergence smart SIM card is inserted into the terminal device, the micro control unit MCU of the multi-network convergence smart SIM card obtains the network service data of the terminal device through the IO interface, parses and processes the network service data, and obtains the network strength of the terminal device, thereby ensuring data security. The micro control unit MCU also obtains the card cutting instruction issued by the cloud platform through the IO interface. The micro control unit MCU controls the multi-network switching circuit to execute automatic card cutting according to the network strength or the card cutting instruction, and completes the intelligent switching of multi-network cellular networks, so that the terminal device does not need to implant additional applications and software development kits SDK, realizes SIM card plug-and-play and real-time intelligent switching of multi-network cellular networks, and uses the micro control unit MCU to increase the example parsing capability, increase the control power supply mode, reduce power consumption, and increase the binary SMS sending channel to reduce the terminal device running resources.

[0061] Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A multi-network cellular network intelligent switching system, characterized in that: include: A multi-network fusion intelligent SIM card (1) and a cloud platform (2); the multi-network fusion intelligent SIM card (1) is provided with a microcontroller unit MCU (11), a multi-network switching circuit (12) and an IO interface (13); the microcontroller unit MCU (11) is respectively connected to the multi-network switching circuit (12) and the IO interface (13); the multi-network switching circuit (12) comprises a first SIM card switching circuit (121), a second SIM card switching circuit (122), a third SIM card switching circuit (123) and a communication protocol circuit (124); the microcontroller unit MCU (11) is respectively connected to the first SIM card switching circuit (121), the second SIM card switching circuit (122), the third SIM card switching circuit (123) and the communication protocol circuit (124); The first SIM card switching circuit (121) is respectively connected to the VSSA pin, VDDA pin, PA0-WKUP pin and PA3 pin of the micro control unit MCU (11); the second SIM card switching circuit (122) is respectively connected to the VDD_3 pin, PD2 pin, PA14-SWCLK pin, PA13-SWDIO pin, PA10 pin, PA9 pin and PC7 pin of the micro control unit MCU (11); the third SIM card switching circuit (123) is respectively connected to the PB12 pin, VDD_1 pin and PB10 pin of the micro control unit MCU (11); and the communication protocol circuit (124) is respectively connected to the PB0 pin, PB1 pin, PE7 pin, PE8 pin and PE9 pin of the micro control unit MCU (11); After the multi-network convergence smart SIM card (1) is inserted into the terminal device, the micro control unit MCU (11) of the multi-network convergence smart SIM card (1) obtains network service data of the terminal device through the IO interface (13), parses and processes the network service data, and obtains the network strength of the terminal device, including: The microcontroller unit MCU interacts with the communication module of the terminal device, sends a data request to the communication module, and the communication module receives the data request and returns network service data of network status and network strength to the microcontroller unit MCU; The micro control unit MCU confirms the network status by pinging the network delay, and analyzes the network strength through the measurement result to obtain the network strength of the terminal device; The microcontroller unit MCU (11) also obtains a card switching instruction issued by the cloud platform (2) through the IO interface (13), and the microcontroller unit MCU (11) controls the multi-network switching circuit (12) to perform automatic card switching according to the network strength or the card switching instruction, thereby completing the multi-network cellular network intelligent switching, including: 1) The micro control unit MCU obtains the network status. If the network status is limited service or no service, the micro control unit MCU controls the multi-network switching circuit (12) to switch off the card; if the network status is normal service, the micro control unit MCU does not control the multi-network switching circuit (12) to switch off the card; 2) The microcontroller unit MCU obtains RSRP values ​​(Reference Signal Received Power) of the network strength for 9 times within 3 minutes, where the RSRP value represents a physical quantitative index of the network strength. The RSRP values ​​of the network strength obtained for 9 times within 3 minutes are averaged to obtain a threshold value. If the threshold value is less than a judgment setting value of -105 dBm, where dBm is a unit of network strength, the microcontroller unit MCU directly controls the multi-network switching circuit (12) to switch off the card; If the threshold is greater than the judgment setting value -105dBm, the network standard is judged. If the network standard satisfies 5G>4G, the micro control unit MCU does not control the multi-network switching circuit (12) to switch off the card; if the network standard satisfies 3G or 2G, the micro control unit MCU controls the multi-network switching circuit (12) to switch off the card.

2. The multi-network cellular network intelligent switching system according to claim 1, characterized in that: The first SIM card switching circuit (121) comprises a ground terminal, a chip power supply VDD_MCU, a clock signal interface SIM_CLK and a first circuit power supply VCC_SIM1, the ground terminal being connected to a VSSA pin of a micro control unit MCU (11), the chip power supply VDD_MCU being connected to a VDDA pin of the micro control unit MCU (11), the clock signal interface SIM_CLK being connected to a PA0-WKUP pin of the micro control unit MCU (11), and the first circuit power supply VCC_SIM1 being connected to a PA3 pin of the micro control unit MCU (11).

3. The multi-network cellular network intelligent switching system according to claim 1, characterized in that: The second SIM card switching circuit (122) comprises a chip power supply VDD_MCU, a PD2 interface, an MCU_PA4 / SWCLK interface, an MCU_PA13 / SWDIO interface, a programming power supply SIM_VPP_PA10, a SIM_DATA data interface and a second circuit power supply VCC_SIM2, wherein the chip power supply VDD_MCU is connected to the VDD_3 pin of the micro control unit MCU (11), the PD2 interface is connected to the PD2 pin of the micro control unit MCU (11), the MCU_PA4 / SWCLK interface is connected to the PA14-SWCLK pin of the micro control unit MCU (11), the MCU_PA13 / SWDIO interface is connected to the PA13-SWDIO pin of the micro control unit MCU (11), the programming power supply SIM_VPP_PA10 is connected to the PA10 pin of the micro control unit MCU (11), the SIM_DATA data interface is connected to the PA9 pin of the micro control unit MCU (11), and the second circuit power supply VCC_SIM2 is connected to the PC7 pin of the micro control unit MCU (11).

4. The multi-network cellular network intelligent switching system according to claim 1, characterized in that: The third SIM card switching circuit (123) comprises a SIM_RST reset pin, a chip power supply VDD_MCU and a third circuit power supply VCC_SIM3, wherein the SIM_RST reset pin is connected to a PB12 pin of a micro control unit MCU (11), the chip power supply VDD_MCU is connected to a VDD_1 pin of the micro control unit MCU (11), and the third circuit power supply VCC_SIM3 is connected to a PB10 pin of the micro control unit MCU (11).

5. The multi-network cellular network intelligent switching system according to claim 1, characterized in that: The communication protocol circuit (124) comprises a PB0 interface, a PB1 interface, a PE7 interface, a PE8_UART_TX transmission interface, a transmitter TP_1 and a PE9_UART-RX reception interface, the PB0 interface being connected to the PB0 pin of the micro control unit MCU (11), the PB1 interface being connected to the PB1 pin of the micro control unit MCU (11), the PE7 interface being connected to the PE7 pin of the micro control unit MCU (11), the PE8_UART_TX transmission interface being connected to the PE8 pin of the micro control unit MCU (11) and the transmitter TP_1 respectively, and the PE9_UART-RX reception interface being connected to the PE9 pin of the micro control unit MCU (11).

6. The multi-network cellular network intelligent switching system according to claim 1, characterized in that: The IO interface (13) comprises a SIM1_IO port, a SIM2_IO port and a SIM3_IO port, the SIM1_IO port being connected to a PA3 pin of a microcontroller unit MCU (11), the SIM2_IO port being connected to a PC8 pin of the microcontroller unit MCU (11), and the SIM3_IO port being connected to a PB10 pin of the microcontroller unit MCU (11).

7. A multi-network cellular network intelligent switching method, implemented based on the multi-network cellular network intelligent switching system according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. After the multi-network fusion smart SIM card (1) micro control unit MCU (11) is inserted into the multi-network fusion smart SIM card (1) into the terminal device, the network service data of the terminal device is obtained through the IO interface (13); S2. The microcontroller unit MCU (11) parses and processes the network service data to obtain the network strength of the terminal device; S3. The microcontroller unit MCU (11) also obtains the card cutting instruction issued by the cloud platform (2) through the IO interface (13); S4. The microcontroller unit MCU (11) controls the multi-network switching circuit (12) to perform automatic switching according to the network strength or the card switching instruction, thereby completing intelligent switching of the multi-network cellular network.

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