Internet gateway based on 5G and TETRA networks and implementation method
By designing an Internet connection based on 5G and TETRA networks, the interconnection between 5G and TETRA lines is achieved, and the problem of mutual support for wireless communications in the prior art is solved, and the convenience and security of subway operations are improved.
Patent Information
- Application Number
- CN202411984615.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-05-16
AI Technical Summary
The prior art is difficult to achieve interconnection between 5G and TETRA lines, resulting in the inability to achieve mutual support for wireless communication in places such as transfer stations, affecting the convenience and security of subway operations.
A 5G and TETRA network-based Internet connection is designed to realize voice interoperability between 5G and TETRA wireless communication systems through a combination of control unit, TETRA module, 5G module and power supply unit. This Internet connection includes circuit components such as core board, serial port unit, interface, etc., and supports the interconnection of different networks through modular design.
The voice call function between 5G and TETRA terminals is realized, which solves the problem of interconnection between lines, improves the convenience and security of subway operations, and is easy to use and has a low cost.
Smart Images
Figure CN120018080A_ABST
Abstract
Description
Technical Field
[0001] This patent relates to the field of Internet gateways in rail transit communications, and in particular to an Internet gateway based on 5G and TETRA networks and an implementation method. Background Art
[0002] With the development of urban rail transit, rail transit wireless communication technology is also constantly upgrading and improving. In the early years, the domestic rail transit industry mainly used TETRA technology to realize wireless communication services. With the advancement of science and technology and the development of the industry, TETRA technology has gradually failed to meet the needs of use, and LTE technology has gradually replaced it as the mainstream. However, in recent years, 5G technology has gradually matured and its scope of application has gradually covered various other fields. Its advantages such as high speed, low latency, and large bandwidth are very suitable for application in the field of rail transit wireless communication. At present, some cities in China have applied 5G technology to the construction of urban rail transit wireless communication. However, with the improvement of urban rail transit construction and the increase in the number of subway lines, the mutual communication between existing lines using TETRA technology and new lines using 5G technology is an issue that needs to be considered. For example, there will be many transfer stations where new and old lines intersect. At the same station, the old line uses TETRA technology, while the new line uses 5G technology. The two sides cannot communicate with each other, which is very inconvenient in subway operation and management. When a subway operation fails to stop or other emergencies occur, the failure to transmit the message in time may cause very serious consequences. Currently, due to the different core network standards and manufacturers of new and old lines in different places, it is very difficult to achieve interconnection between core networks. In order to meet the demand for mutual communication between 5G lines and TETRA lines in rail transit, the present invention proposes an Internet gateway based on 5G and TETRA networks and an implementation method. Through this Internet gateway, voice communication between 5G and TETRA wireless communication systems can be achieved, which facilitates communication between staff and provides stronger guarantees for the convenience and safety of subway operations.
[0003] The technical solution adopted by the present invention is: an Internet gateway based on 5G and TETRA networks, comprising a control unit, a TETRA module, a 5G module, and a power supply unit; the control unit is connected to the TETRA module and the 5G module respectively, the TETRA module is connected to antenna I, the 5G module is connected to antenna II, and the power supply unit is connected to the control unit and the TETRA module respectively for power supply; The control unit is used to complete the communication with the TETRA module and the 5G module as well as the audio codec transmission and data transmission control functions; The 5G module is used to complete the communication with the 5G core network, the TETRA module is used to complete the communication with the TETRA core network, and the power supply unit is used to convert the 220V AC power supply into a DC 13.8V to supply power to the control unit and the TETRA module; The control unit comprises a core board, a power supply unit I, a power supply unit II, a serial port unit, an interface I, an interface II, and an interface III; the core board is connected to the serial port unit, the interface I, and the interface II respectively, the serial port unit is connected to the interface I, the interface II is connected to the interface III, the power supply unit I is connected to the power supply unit II, the core board, and the serial port unit respectively, and the power supply unit II is connected to the interface II; The core board is used to complete data communication and audio encoding and decoding functions, the serial port unit is used to convert the TTL level serial port of the core board into an RS232 level serial port connected to interface I; interface I is used to connect the TETRA module and the control unit, the interface III is connected to interface II, which is used to connect the SIM card with the 5G module, the power supply unit I is used to convert the DC 13.8V power supply into a DC 5V power supply, and supply power to the power supply unit II, the core board, and the serial port unit, and the power supply unit II is used to convert the 5V power supply into a 4.2V power supply connected to interface II, and supply power to the 5G module. A method for implementing an Internet gateway based on 5G and TETRA networks, when a 5G terminal and a TETRA terminal make a call, the terminal needs to be set to a pre-defined interconnection group first, and then a group call of the current group is initiated through the terminal; When a TETRA terminal is used to initiate a call to a 5G terminal, the call information is transmitted to the Internet gateway through the TETRA core network; the TETRA module receives the call information sent by the TETRA core network through antenna I, and sends the data and audio to the core board through interface I. The core board packages the data and audio and sends them to the 5G module through interface II. The 5G module transmits them through antenna II to the 5G core network, and then the 5G core network forwards them to the 5G terminal to complete the call from TETRA to the 5G terminal; When a 5G terminal is used to initiate a call to a TETRA terminal, the call information is sent through the 5G core network. After the 5G module in the Internet gateway receives the call information through antenna II, it is sent to the control unit through interface II. The control unit processes the call information and sends it to the TETRA module through interface I. The TETRA module transmits it through antenna I to the TETRA core network, and then the TETRA core network forwards it to the TETRA terminal to complete the call from 5G to TETRA terminal.
[0004] The terminal is first set to a pre-defined interconnection group method as follows: the interconnection group is first determined, and the interconnection group is set in the 5G module, TETRA module, 5G terminal, and TETRA terminal respectively. Then the software of the control unit also needs to be set according to the interconnection group. When the 5G terminal and the TETAR terminal want to make an interconnection call, the call group needs to be set to the interconnection group. In this way, when the Internet gateway receives the call, the software of the control unit will identify whether the call is initiated by a member of the interconnection group. If so, data forwarding will be performed according to the process. If the group setting is incorrect, the interconnection call cannot be established. Similarly, multiple interconnection groups are pre-set accordingly. The control unit will perform corresponding operations according to the correspondence between different pre-set interconnection groups, thereby realizing the interconnection function.
[0005] The beneficial effect of the present invention is that the present invention supports the realization of voice call function between TETRA communication terminal and 5G communication in rail transit lines with both 5G and TETRA networks, and solves the interconnection problem between 5G and TETRA lines. The Internet gateway device only needs to be in an environment with TETRA network and 5G network coverage, and is very convenient to use. The transfer station is where more than two subway lines meet. The operation of the train and the daily operation management in the subway require dedicated wireless communication equipment. For example, terminal equipment such as vehicle-mounted stations, handheld stations, fixed stations, or dispatching stations in dispatching centers. After using the Internet gateway, whether using a TETRA terminal or a 5G terminal, you can talk to the terminal under the other party's network in your own network. In this way, whether it is daily affairs communication or calls in emergency situations, the convenience and safety of subway operations are greatly improved. Moreover, it is very convenient to use the Internet gateway to complete the interconnection function. In actual use, according to the network used by the actual line, you only need to replace the corresponding module to meet the use requirements of the current line. It is very flexible and convenient, and the cost is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS
[0006] Figure 1 A circuit connection block diagram for realizing the Internet gateway of the present invention; Figure 2 A circuit connection block diagram for realizing the control unit of the present invention; Figure 3 To realize the circuit diagram of the core board of the present invention; Figure 4 A circuit diagram for realizing a power supply unit 1 of the present invention; Figure 5 A circuit diagram for realizing the power supply unit II of the present invention; Figure 6 A circuit diagram for realizing the serial port unit of the present invention; Figure 7A circuit diagram for realizing interface I of the present invention; Figure 8 A circuit diagram for realizing interface II of the present invention; Fig. 9 A circuit diagram for realizing interface III of the present invention; Fig.10 A circuit connection block diagram of a specific embodiment of the present invention; Fig.11 The present invention discloses a workflow of the Internet gateway intercom. DETAILED DESCRIPTION
[0007] like Figure 1 As shown, an Internet gateway based on 5G and TETRA networks includes a TETRA module, a 5G module, a power supply unit, a control unit, and an antenna.
[0008] like Figure 2 As shown, the control unit includes a core board, a power supply unit I, a power supply unit II, a serial port unit, an interface I, an interface II, and an interface III.
[0009] The control unit uses a high-performance core board equipped with Rockchip's RK3568 processor; for the serial port, the core board has its own TTL serial port, which is converted to an RS232 serial port using a serial port unit and connected to the TETRA module; In the analog audio part, analog audio transmission is used between the control unit and the TETRA module. The core board on the control unit converts the analog audio transmitted by the TETRA module into digital audio, and then the core board converts the digital audio from the 5G module into analog audio and gives it to the TETRA module.
[0010] The control unit is connected to the 5G module through the USB3.0 interface of the core board to realize data transmission.
[0011] like Figure 3As shown, the specific circuit of the core board is: pin 3 of chip XS4 is connected to pin 12 of serial port unit chip N11, pin 5 of chip XS4 is connected to pin 11 of serial port unit chip N11, pin 10 is connected to resistor R130 of interface II, pin 12 is connected to resistor R129 of interface II, pin 16 is connected to capacitor C90 of interface II, pin 18 is connected to capacitor C89 of interface II, pin 22 is connected to pin 67 of interface II N18, pin 28 is connected to resistor R132 of interface II, pin 30 is connected to resistor R134 of interface II, and pin 34 is connected to interface I Pin 4 and pin 36 of XS13 are connected to pin 5 of interface IXS13, pin 70 is connected to pin 1 of interface XS1, pin 72 is connected to pin 2 of interface XS1, pin 78 and pin 80 are connected to VDD5V, pin 75, pin 77 and pin 79 of chip XS4 are connected, and connected to capacitor C23 and one end of capacitor C24 and VDD5V through resistor R24; pin 1, pin 7, pin 13, pin 19, pin 25, pin 31, pin 37, pin 43, pin 49, pin 55, pin 61, pin 67, pin 71, pin 73, pin 8, pin 14, pin 20, pin 26, pin 32, pin 38, pin 46, pin 52, pin 58, pin 60, pin 62, pin 74 and pin 76 of core board XS4 are grounded respectively; the model of chip XS4 is RK3568.
[0012] like Figure 4 As shown, the specific circuit of the power supply unit I is as follows: pin 1 of the chip N2 is connected to pin 8 of the chip N2, the cathode of the diode VD2, and one end of the inductor L2 through the capacitor C2, the anode of the diode VD2 is connected to GND, the other end of the inductor L2 is connected to the resistor R4, the capacitor C9, the capacitor C10, one end of the capacitor C11 and VDD5V, the capacitor C9, the capacitor C10 and one end of the capacitor C11 are connected to GND, the other end of the resistor R4 is connected to pin 4 of the chip N2 and one end of the resistor R7, the other end of the resistor R7 is connected to GND, the pin 3 of the chip N2 is connected to GND through the resistor R5, the pin 5 of the chip N2 is connected to pin 7 of the chip N2 and the cathode of the diode VD1 through the resistor R2, the anode of the diode VD1 is connected to the capacitor C14, one end of the capacitor C5 and VCC13.8V, the other ends of the capacitor C14, the capacitor C5 and the pin 6 and pin 0 of the chip N2 are connected to GND respectively; the model of the chip N2 is LM22670MR_ADJ.
[0013] like Figure 5As shown, the specific circuit of the power supply unit II is: pin 1 of the chip N1 is connected to resistor R3, resistor R6, and one end of capacitor C6, resistor R6 is connected to GND through resistor R8, the other end of resistor R3 is connected to the other end of capacitor C6, inductor L1, capacitor C7, one end of capacitor C8 and VCC3V3, the other end of inductor L1 is connected to one end of capacitor C1 and pin 5 of chip N1, the other end of capacitor C1 and pin 6 of chip N1, pin 2 of chip N1 is connected to one end of capacitor C3, pin 4 of chip N1 and VCC5V through resistor R1, the other ends of capacitor C3, capacitor C7, capacitor C8 and pin 3 of chip N1 are respectively connected to GND; the model of chip N1 is SY8105IADC.
[0014] like Figure 6 As shown, the specific circuit of the serial port unit is: a capacitor C46 is connected in series between pin 1 and pin 3 of the chip N11, a capacitor C48 is connected in series between pin 4 and pin 5 of the chip N11, pin 6 of the chip N11 is connected to GND through a capacitor C51, pin 2 of the chip N11 is connected to a resistor R35, a capacitor C43, one end of a capacitor C44 and pin 16 of the chip N11 through a capacitor C42, the other end of the resistor R35 is connected to VDD5V, the other ends of the capacitors C43 and C44 are connected to GND, pin 14 of the chip N11 is connected to pin 2 of the interface XS13 of the interface I, pin 13 of the chip N11 is connected to pin 3 of the interface XS13 of the interface I, pin 12 of the chip N11 is connected to pin 3 of the core board chip XS4, and pin 11 of the chip N11 is connected to pin 5 of the core board chip XS4; the model of the chip N11 is MAX232CSE.
[0015] like Figure 7 As shown, the specific circuit of interface I is: pin 1 of interface XS13 is connected to VCC13V8, pin 2 of interface XS13 is connected to pin 14 of serial port unit chip N11, pin 3 of interface XS13 is connected to pin 13 of serial port unit chip N11, pin 4 of interface XS13 is connected to pin 34 of core board chip XS4, pin 5 of interface XS13 is connected to pin 36 of core board chip XS4, and pin 6, pin 7, pin 8 and pin 0 of interface XS13 are connected to GND respectively.
[0016] like Figure 8As shown, the specific circuit of interface II is: pin 3, pin 5, pin 11, pin 27, pin 33, pin 39, pin 45, pin 51, pin 57, pin 71, pin 73 and pin 0 of interface N18 are connected to GND respectively, pin 7 of interface N18 is connected to pin 30 of core board chip XS4 through resistor R134, pin 9 of interface N18 is connected to pin 28 of core board chip XS4 through resistor R132, pin 29 of interface N18 is connected to pin 10 of core board chip XS4 through resistor R130, and pin 10 of interface N18 is connected to pin 11 of core board chip XS4 through resistor R131. Pin 31 is connected to pin 12 of the core board chip XS4 through resistor R129, pin 35 of interface N18 is connected to pin 16 of the core board chip XS4 through capacitor C90, pin 37 of interface N18 is connected to pin 18 of the core board chip XS4 through capacitor C89, pin 67 of interface N18 is connected to resistor R141, one end of resistor R138 and pin 22 of the core board chip XS4, the other end of resistor R138 is connected to the collector of transistor VT2 and one end of capacitor C93, the other end of resistor R141 ... The base of transistor VT2 and one end of resistor R142, the other end of resistor R142 is connected to the other end of capacitor C93, the emitter of transistor VT2 and GND, the 30th pin of interface N18 is connected to the 2nd pin of interface III interface XS2 through resistor R128, the 32nd pin of interface N18 is connected to the 3rd pin of interface III interface XS2 through resistor R127, the 34th pin of interface N18 is connected to the 7th pin of interface III interface XS2 through resistor R126, the 36th pin of interface N18 is connected to the Pin 1 of interface XS2 and pin 66 of interface N18 are connected to pin 4 of interface III interface XS2, pin 4, pin 70, pin 72 and pin 74 of interface N18 are respectively connected to one end of capacitor C83, capacitor C82, capacitor C81, capacitor C80, capacitor C79, capacitor C78, capacitor C77 and VCC5G, and the other ends of capacitor C83, capacitor C82, capacitor C81, capacitor C80, capacitor C79, capacitor C78, capacitor C77 are connected to GND; the model of interface N18 is M.2 Module Key B.
[0017] like Fig. 9 As shown, the specific circuit of interface III is that pin 1 of interface XS2 is connected to pin 36 of interface II interface N18, pin 2 of interface XS2 is connected to interface II resistor R128 and one end of capacitor C41, pin 3 of interface XS2 is connected to interface II resistor R127 and one end of capacitor C45, the other end of capacitor C45 and capacitor C41 are connected to GND, pin 4 of interface XS2 is connected to pin 66 of interface II interface N18 and one end of resistor R38, pin 7 of interface XS2 is connected to interface II resistor R126, capacitor C49 and one end of resistor R39, the other end of resistor R38 and resistor R39 are connected to pin 36 of interface II interface N18, and pin 5, pin 8, pin 0 of interface XS2 and the other end of capacitor C49 are connected to GND respectively.
[0018] Embodiment 1, as Fig.10 , Fig.11 As shown, a method for implementing an Internet gateway based on 5G and TETRA networks, the steps are as follows: Step 1: If subway station A is a transfer station for 5G subway line M and TETRA subway line N, the staff of subway line M is using 5G terminals, while the staff of subway line N is using TETRA terminals. The Internet gateway is installed in an environment where station A can receive 5G and TETRA networks. The Internet gateway is powered by a 220V AC power supply. The power supply unit of the Internet gateway converts the AC 220V power supply into DC 13.8V to power the power supply unit I and TETRA module respectively; the power supply unit I converts the DC 13.8V into DC 5V to power the power supply unit II, the core board, and the serial port unit. The power supply unit II converts the DC 5V into DC 4.2V and connects it to the interface II. The TETRA antenna and the 5G antenna should be connected well. The Internet gateway can communicate wirelessly with the 5G terminal and the TETRA terminal respectively. Step 2: When the staff of subway line M wants to contact the staff of subway line N using the 5G terminal, they need to set the 5G terminal to the pre-defined interconnection group first, and then initiate a group call of the current group through the 5G terminal. After the 5G terminal initiates a call to the TETRA terminal, the call information is sent through the 5G core network. The 5G module in the Internet gateway receives the call information through antenna II and sends it to the core board through interface II. The core board processes the call information and sends the analog audio to the TETRA module through interface I. The data is converted from TTL level to RS232 serial port through the serial port unit and then sent to the TETRA module through interface I; the TETRA module transmits it through antenna I to the TETRA core network, and then the TETRA core network forwards it to the TETRA terminal to complete the call from 5G to TETRA terminal. At this time, the call between the two parties is established and the call is realized. Similarly, when a call is initiated using a TETRA terminal, the call information is transmitted to the Internet gateway through the TETRA core network; after the TETRA module receives the call information sent by the TETRA core network through antenna I, it sends the data to the core board through the serial port unit through interface I, and sends the audio to the core board chip XS4. The core board chip XS4 packages the data and audio and sends them to the 5G module through interface II. The 5G module transmits it through antenna II to the 5G core network, and then the 5G core network forwards it to the 5G terminal to complete the call from TETRA to the 5G terminal.
Claims
1. An Internet gateway based on 5G and TETRA networks, characterized by: Including control unit, TETRA module, 5G module, power supply unit; The control unit is connected to the TETRA module and the 5G module respectively, the TETRA module is connected to the antenna I, the 5G module is connected to the antenna II, and the power supply unit is connected to the control unit and the TETRA module respectively for power supply; The control unit is used to complete the communication with the TETRA module and the 5G module as well as the audio codec transmission and data transmission control functions; The 5G module is used to complete the communication with the 5G core network, the TETRA module is used to complete the communication with the TETRA core network, and the power supply unit is used to convert the 220V AC power supply into a DC 13.8V to supply power to the control unit and the TETRA module; The control unit includes a core board, a power supply unit I, a power supply unit II, a serial port unit, an interface I, an interface II, and an interface III; The core board is respectively connected to the serial port unit, interface I, and interface II, the serial port unit is connected to interface I, the interface II is connected to interface III, the power supply unit I is respectively connected to the power supply unit II, the core board, and the serial port unit, the power supply unit II is connected to interface II, the core board is used to complete data communication and audio encoding and decoding functions, and the serial port unit is used to convert the TTL level serial port of the core board into an RS232 level serial port connected to interface I; The interface I is used to connect the TETRA module and the control unit, the interface III is connected to the interface II, and is used to connect the SIM card to the 5G module. The power supply unit I is used to convert the DC 13.8V power supply into a DC 5V power supply to power the power supply unit II, the core board, and the serial port unit. The power supply unit II is used to convert the 5V power supply into a 4.2V power supply connected to the interface II to power the 5G module.
2. The Internet gateway based on 5G and TETRA network according to claim 1, characterized in that: The specific circuit of the core board is as follows: Pin 3 of chip XS4 is connected to Pin 12 of serial port unit chip N11, Pin 5 of chip XS4 is connected to Pin 11 of serial port unit chip N11, Pin 10 is connected to resistor R130 of interface II, Pin 12 is connected to resistor R129 of interface II, Pin 16 is connected to capacitor C90 of interface II, Pin 18 is connected to capacitor C89 of interface II, Pin 22 is connected to Pin 67 of interface II N18, Pin 28 is connected to resistor R132 of interface II, Pin 30 is connected to resistor R134 of interface II, Pin 34 is connected to Pin 4 of interface I XS13, Pin 36 is connected to Pin 5 of interface I XS13, Pin 70 is connected to Pin 1 of interface XS1, Pin 72 is connected to Pin 2 of interface XS1, Pin 78 and Pin 80 are connected to VDD5V, Pin 75, Pin 77 and Pin 79 of chip XS4 are connected, and are connected to one end of capacitor C23 and capacitor C24 and VDD5V through resistor R24; Pin 1, 7, 13, 19, 25, 31, 37, 43, 49, 55, 61, 67, 71, 73, 8, 14, 20, 26, 32, 38, 46, 52, 58, 60, 62, 74 and 76 of the core board XS4 are grounded respectively; The model of chip XS4 is RK3568.
3. The Internet gateway based on 5G and TETRA network according to claim 1, characterized in that: The specific circuit of the power supply unit I is as follows: pin 1 of chip N2 is connected to pin 8 of chip N2, the cathode of diode VD2, and one end of inductor L2 through capacitor C2, the anode of diode VD2 is connected to GND, the other end of inductor L2 is connected to resistor R4, capacitor C9, capacitor C10, one end of capacitor C11 and VDD5V, capacitor C9, capacitor C10 and one end of capacitor C11 are connected to GND, the other end of resistor R4 is connected to pin 4 of chip N2 and one end of resistor R7, the other end of resistor R7 is connected to GND, pin 3 of chip N2 is connected to GND through resistor R5, pin 5 of chip N2 is connected to pin 7 of chip N2 and the cathode of diode VD1 through resistor R2, the anode of diode VD1 is connected to capacitor C14, one end of capacitor C5 and VCC13.8V, the other ends of capacitor C14, capacitor C5 and pin 6 and pin 0 of chip N2 are connected to GND respectively; the model of chip N2 is LM22670MR_ADJ.
4. The Internet gateway based on 5G and TETRA network according to claim 1, characterized in that: The specific circuit of the power supply unit II is as follows: pin 1 of chip N1 is connected to resistor R3, resistor R6, and one end of capacitor C6; resistor R6 is connected to GND through resistor R8; the other end of resistor R3 is connected to the other end of capacitor C6, inductor L1, capacitor C7, one end of capacitor C8 and VCC3V3; the other end of inductor L1 is connected to one end of capacitor C1 and pin 5 of chip N1, the other end of capacitor C1 and pin 6 of chip N1; pin 2 of chip N1 is connected to one end of capacitor C3, pin 4 of chip N1 and VCC5V through resistor R1; the other ends of capacitor C3, capacitor C7, capacitor C8 and pin 3 of chip N1 are respectively connected to GND; the model of chip N1 is SY8105IADC.
5. The Internet gateway based on 5G and TETRA network according to claim 1, characterized in that: The specific circuit of the serial port unit is as follows: a capacitor C46 is connected in series between pin 1 and pin 3 of the chip N11, a capacitor C48 is connected in series between pin 4 and pin 5 of the chip N11, pin 6 of the chip N11 is connected to GND through a capacitor C51, pin 2 of the chip N11 is connected to a resistor R35, a capacitor C43, one end of a capacitor C44 and pin 16 of the chip N11 through a capacitor C42, the other end of the resistor R35 is connected to VDD5V, the other ends of the capacitors C43 and C44 are connected to GND, pin 14 of the chip N11 is connected to pin 2 of the interface XS13 of the interface I, pin 13 of the chip N11 is connected to pin 3 of the interface XS13 of the interface I, pin 12 of the chip N11 is connected to pin 3 of the core board chip XS4, and pin 11 of the chip N11 is connected to pin 5 of the core board chip XS4; the model of the chip N11 is MAX232CSE.
6. The Internet gateway based on 5G and TETRA network according to claim 1, characterized in that: The specific circuit of interface I is as follows: pin 1 of interface XS13 is connected to VCC13V8, pin 2 of interface XS13 is connected to pin 14 of serial port unit chip N11, pin 3 of interface XS13 is connected to pin 13 of serial port unit chip N11, pin 4 of interface XS13 is connected to pin 34 of core board chip XS4, pin 5 of interface XS13 is connected to pin 36 of core board chip XS4, and pins 6, 7, 8 and 0 of interface XS13 are respectively connected to GND.
7. The Internet gateway based on 5G and TETRA network according to claim 1, characterized in that: The specific circuit of the interface II is as follows: the 3rd, 5th, 11th, 27th, 33rd, 39th, 45th, 51st, 57th, 71st, 73rd and 0th pins of the interface N18 are connected to GND respectively, the 7th pin of the interface N18 is connected to the 30th pin of the core board chip XS4 through the resistor R134, the 9th pin of the interface N18 is connected to the 28th pin of the core board chip XS4 through the resistor R132, the 29th pin of the interface N18 is connected to the 10th pin of the core board chip XS4 through the resistor R130, and the Pin 31 is connected to pin 12 of the core board chip XS4 through resistor R129, pin 35 of interface N18 is connected to pin 16 of the core board chip XS4 through capacitor C90, pin 37 of interface N18 is connected to pin 18 of the core board chip XS4 through capacitor C89, pin 67 of interface N18 is connected to resistor R141, one end of resistor R138 and pin 22 of the core board chip XS4, the other end of resistor R138 is connected to the collector of transistor VT2 and one end of capacitor C93, the other end of resistor R141 ... The base of transistor VT2 and one end of resistor R142, the other end of resistor R142 is connected to the other end of capacitor C93, the emitter of transistor VT2 and GND, the 30th pin of interface N18 is connected to the 2nd pin of interface III interface XS2 through resistor R128, the 32nd pin of interface N18 is connected to the 3rd pin of interface III interface XS2 through resistor R127, the 34th pin of interface N18 is connected to the 7th pin of interface III interface XS2 through resistor R126, the 36th pin of interface N18 is connected to the Pin 1 of interface XS2 and pin 66 of interface N18 are connected to pin 4 of interface III interface XS2, pin 4, pin 70, pin 72 and pin 74 of interface N18 are respectively connected to one end of capacitor C83, capacitor C82, capacitor C81, capacitor C80, capacitor C79, capacitor C78, capacitor C77 and VCC5G, and the other ends of capacitor C83, capacitor C82, capacitor C81, capacitor C80, capacitor C79, capacitor C78, capacitor C77 are connected to GND; the model of interface N18 is M.2 ModuleKey B.
8. The Internet gateway based on 5G and TETRA network according to claim 1, characterized in that: The specific circuit of interface III is as follows: pin 1 of interface XS2 is connected to pin 36 of interface II interface N18, pin 2 of interface XS2 is connected to interface II resistor R128 and one end of capacitor C41, pin 3 of interface XS2 is connected to interface II resistor R127 and one end of capacitor C45, the other end of capacitor C45 and capacitor C41 are connected to GND, pin 4 of interface XS2 is connected to pin 66 of interface II interface N18 and one end of resistor R38, pin 7 of interface XS2 is connected to interface II resistor R126, capacitor C49 and one end of resistor R39, the other end of resistor R38 and resistor R39 are connected to pin 36 of interface II interface N18, and pin 5, pin 8, pin 0 of interface XS2 and the other end of capacitor C49 are connected to GND respectively.
9. A method for implementing the Internet gateway based on 5G and TETRA networks according to claim 1, characterized in that: When a 5G terminal and a TETRA terminal make a call, the terminal needs to be set to a pre-defined interconnection group first, and then a group call of the current group is initiated through the terminal; When a call is initiated from a TETRA terminal to a 5G terminal, the call information is transmitted to the Internet gateway via the TETRA core network; The TETRA module receives the call information sent by the TETRA core network through antenna I, and sends the data and audio to the core board through interface I. The core board packages the data and audio and sends them to the 5G module through interface II. The 5G module transmits them to the 5G core network through antenna II, and then the 5G core network forwards them to the 5G terminal to complete the call from TETRA to the 5G terminal. When a 5G terminal is used to initiate a call to a TETRA terminal, the call information is sent through the 5G core network. After the 5G module in the Internet gateway receives the call information through antenna II, it is sent to the control unit through interface II. The control unit processes the call information and sends it to the TETRA module through interface I. The TETRA module transmits it through antenna I to the TETRA core network, and then the TETRA core network forwards it to the TETRA terminal to complete the call from 5G to TETRA terminal.
10. The method for implementing an Internet gateway based on 5G and TETRA networks according to claim 9, characterized in that: The terminal is first set to a pre-defined interconnection group method as follows: the interconnection group is first determined, and the interconnection group is set in the 5G module, TETRA module, 5G terminal, and TETRA terminal respectively. Then the software of the control unit also needs to be set according to the interconnection group. When the 5G terminal and the TETAR terminal want to make an interconnection call, the call group needs to be set to the interconnection group. In this way, when the Internet gateway receives the call, the software of the control unit will identify whether the call is initiated by a member of the interconnection group. If so, data forwarding will be performed according to the process. If the group setting is incorrect, the interconnection call cannot be established. Similarly, multiple interconnection groups are pre-set accordingly. The control unit will perform corresponding operations according to the correspondence between different pre-set interconnection groups, thereby realizing the interconnection function.