Motorola and Airbus TETRA intercommunication system and implementation method

Abstract

A Motorola and Airbus TETRA interconnection system and implementation method, belonging to the field of digital trunking communication technology. The Internet gateway device is connected to the Motorola TETRA system and the Airbus TETRA system respectively; the switch connects the Motorola TETRA system and the Airbus TETRA system for information transmission and exchange; the Internet gateway device is used to exchange information transmitted from the Motorola TETRA system and the Airbus TETRA system, and the interconnection initiation and reception information and audio interaction transmitted to the Internet gateway device are processed by software; the Motorola TETRA system and the Airbus TETRA system are used to transmit and process information transmitted from one party; the present invention can realize the functions of interconnection call group, dynamic allocation of interconnection channels, modification of interconnection call groups, group call preemption, group call right allocation and handset roaming.

Description

Technical Field

[0001] The present invention belongs to the technical field of digital trunking communication, and in particular relates to a Motorola and Airbus TETRA interconnection system and an implementation method. Background Art

[0002] With the continuous increase of urban rail transit lines, wireless interconnection technology has emerged. The application of wireless interconnection technology can ensure the efficient transmission of internal subway communications, so that the subway network can operate normally, and truly form a large network of wireless communication systems for each subway line to meet user needs, improve work efficiency, and thus generate economic benefits. The current communication system used in urban rail is mainly based on the TETRA system. However, there are numerous domestic brands that can provide Tetra digital trunking system equipment, including Motorola and Airbus. The brands of TETRA systems used in different cities and subway lines are also mostly different. There is a lack of interconnection business equipment between Motorola TETRA system and Airbus TETRA system on the market. In addition, in actual applications, there are problems such as channel resource occupation, high equipment cost, and complex installation and connection methods. The interconnection equipment between systems has poor audio quality during calls. Summary of the invention

[0003] In view of the fact that the existing technologies have channel resource occupation, high equipment cost, complex installation and connection methods, and poor audio quality during calls in the interconnection equipment between systems, in order to realize the interconnection service between the Motorola TETRA system and the Airbus TETRA system and improve the call quality, the present invention analyzes the internal and external interfaces and protocols of the Motorola TETRA system and the Airbus TETRA system, and combines the needs of urban rail users to propose a Motorola and Airbus TETRA interconnection system and implementation method, which does not occupy channel resources, has a simple installation and connection method, and innovatively uses a core convergence Ethernet switching device to aggregate multiple audio inputs and outputs from a gateway server, and can perform noise and echo suppression processing on the received audio, so that the processed audio is clearer and more stable, thereby improving the call quality.

[0004] The technical solution adopted by the present invention is: Motorola and Airbus TETRA interconnection system, including Internet gateway equipment, Motorola TETRA system, Airbus TETRA system and switch;

[0005] The Internet gateway device is connected to the Motorola TETRA system and the Airbus TETRA system respectively;

[0006] The switch connects the Motorola TETRA system with the Airbus TETRA system for information transmission and exchange;

[0007] The Internet gateway device is used to exchange information transmitted from the Motorola TETRA system and the Airbus TETRA system, and to process the initiation and reception information and audio interaction transmitted to the Internet gateway device through software;

[0008] The Motorola TETRA system is used to transmit and process information sent from the Airbus TETRA system;

[0009] The Airbus TETRA system is used to transmit and process information sent by the Motorola TETRA party;

[0010] The Motorola TETRA system is composed of a Motorola base station, a Motorola CCGWⅠ, a Motorola CCGWⅡ, a Motorola original dispatching console, a Motorola switch and a Motorola handheld console;

[0011] The Airbus TETREA system is composed of an Airbus base station, an Airbus TVG server, a core converged Ethernet switching device I, a core converged Ethernet switching device II, an Airbus switch and an Airbus handheld station; the Internet gateway device is composed of a voice gateway, a voice gateway and a gateway server; the motorcycle handheld station is wirelessly connected to the motorcycle base station, the motorcycle base station is respectively connected to the motorcycle CCGW I and the motorcycle CCGW II, the motorcycle CCGW I and the motorcycle CCGW II are respectively connected to the gateway server through the voice gateway and the voice gateway, and the motorcycle original dispatch station is respectively connected to the motorcycle base station and the gateway server through the motorcycle switch; the Airbus TVG server is respectively connected to the core converged Ethernet switching device I and the core converged Ethernet switching device II, the core converged Ethernet switching device I and the core converged Ethernet switching device II are respectively connected to the gateway server, the Airbus switch is respectively connected to the Airbus base station, the Airbus TVG server, the core converged Ethernet switching device I, the core converged Ethernet switching device II and the gateway server, and the Airbus base station is wirelessly connected to the Airbus handheld station; the motorcycle switch and the Airbus switch are connected to each other through the gateway server;

[0012] The core convergence Ethernet switching device I and the core convergence Ethernet switching device II have the same circuit structure, and are composed of an input interface module, a noise suppression processing module, a power supply module and an output interface module. The noise suppression processing module is connected to the input interface module, the power supply module and the output interface module respectively. The specific structure of the noise suppression processing module is as follows:

[0013] Pin 1 of the echo cancellation chip N1 is connected to one end of capacitor C11, pin 3 is connected to one end of capacitor C10, pin 40 is connected to one end of capacitor C9, pin 44 is connected to one end of capacitor C8, pin 34 is connected to one end of capacitor C7, pin 37 is connected to one end of capacitor C6, pin 46 is connected to one end of capacitor C5, and the other ends of capacitors C11, C10, C9, C8, C7, C6, and C5 are connected to GND-AL; pin 14 of the echo cancellation chip N1 is connected to one end of resistor R11 and resistor R15, pin 32 is connected to one end of resistor R17, pin 26 is connected to one end of resistor R20, and pin 25 is connected to one end of resistor R25. Pin 12 of chip N1 is connected to one end of resistor R9, pin 30 is connected to one end of resistor R10, pin 24 is connected to one end of resistor R12, pin 23 is connected to one end of resistor R16, pin 31 is connected to one end of resistor R18, pin 13 is connected to one end of resistor R21, pin 21 is connected to one end of resistor R27, pin 20 is connected to one end of resistor R28, the other end of resistors R15, R17, R20, R21, R25, R27 and R28 are connected to GND-AL, the other end of resistors R9, R10, R11, R12, R16 and R18 are connected to 3.3V power supply ; One end of resistor R2 is connected to a 3.3V power supply, and the other end is connected to one end of capacitor C3, capacitor C4 and pin 35 and pin 19 of echo cancellation chip N1, and the other ends of capacitor C3 and capacitor C4 are connected to GND-AL; one end of resistor R5 is connected to a 3.3V power supply, and the other end is connected to the collector of transistor VT1 through light-emitting diode VD1, the emitter of transistor VT1 is connected to GND-AL, and the base of transistor VT1 is connected to pin 22 of echo cancellation chip N1; pin 7 of echo cancellation chip N1 is connected to GND-AL through resistor R7, pin 18 is connected to GND-AL through resistor R19, and pin 29 is connected to GND through resistor R8 -AL, pin 38 is connected to GND-AL through resistor R4, pin 45 is connected to GND-AL through resistor R3, pin 15 of echo cancellation chip N1 is connected to one end of resistor R14 and pin 5 of memory N2, pin 16 is connected to one end of resistor R13 and pin 6 of memory N2, resistor R14 and the other end of resistor R13 are connected to pin 8 of echo cancellation chip N1 and 3.3V power supply, pin 1, pin 2 and pin 3 of echo cancellation chip N1 are connected to pin 4 of echo cancellation chip N1 and GND-DT through resistor R22, resistor R23 and resistor R24 ​​respectively, pin 7 of echo cancellation chip N1 is connected to GND-DT through resistor R26;

[0014] Pin 28 of the echo cancellation chip N1 is connected to one end of the capacitor C2 and pin 3 of the crystal oscillator Y1, the other end of the capacitor C2 is connected to pin 2 of the crystal oscillator Y1 and GND-AL, pin 1 of the crystal oscillator Y1 is connected to capacitor C1 and one end of the resistor R1, the other end of the resistor R1 is connected to pin 27 of the echo cancellation chip N1, and the other end of the capacitor C1 is connected to pin 4 of the crystal oscillator Y1 and GND-AL;

[0015] The model of the echo cancellation chip N1 is FM1288, the model of the memory N2 is AT24C64D, and the model of the crystal oscillator Y1 is 18.432 MHZ.

[0016] The implementation method of the Motorola and Airbus TETRA interconnection system provides a standard protocol interface or a customized development interface for interconnection through the Motorola TETRA system and the Airbus TETRA system, and uses an Internet gateway device to access the central switching control system of the Motorola TETRA system and the Airbus TETRA system through Ethernet and voice interface devices respectively. Through the authorized intervention of software, the voice status signaling and group call voice information conversion and forwarding are completed at the Internet gateway device to realize the interconnection of the two systems.

[0017] The method for interconnecting the two systems is as follows:

[0018] When the Motorola TETRA system and the Airbus TETRA system conduct an inter-system group call, the group call information processing flow is as follows: the initiator uses the Motorola radio or the Airbus radio to apply for a group call initiation. First, the initiator's API module receives the group call initiation information from the Airbus TVG server or the Motorola original dispatch station, and passes the group call initiation information to the initiator's management module; the initiator's management module passes the group call initiation information to the receiver's management module after receiving it; the receiver's management module finds the receiving group associated with the initiation information after receiving the group call initiation information, and then sends the receiving group information to the receiver's API module; the receiver's API module initiates a group call to the Airbus TVG server or the Motorola original dispatch station, and waits for the receiver to receive a reply from the Airbus TVG server or the Motorola original dispatch station indicating that the group call was successfully created. Then it is sent to the receiving party management module; the receiving party management module determines whether there is any associated group information associated with the receiving group in the associated group call list; after the associated group exists, the initiator passes the group call initiation information to the API module, and the API module allocates a voice channel and sends it to the Airbus TVG server or the Motorola original dispatch station. When the API module receives the notification of the allocated voice channel result, it sends it to the management module, and then the management module determines whether there is any associated group group call information corresponding to the initiator in the associated group information list. If there is any associated group group call information, the associated group group call information list is updated. If not, the associated group group call information is added to the associated group group call information list. After updating to the list, the inter-system group call process ends; thereby, the Motorola TETRA system and the Airbus TETRA system are interconnected and interoperable.

[0019] The beneficial effects of the present invention are as follows: the present invention provides a standard protocol interface or a customizable development interface for interconnection through the TETRA systems of Motorola and Airbus, uses an Internet gateway to access the central switching control system of Motorola and Airbus through Ethernet and voice interface devices respectively, and realizes the interconnection of the two systems by information interaction of the initiated and received information through the authorized intervention of software. The installation and connection method is simple and convenient for operation, the channel resources are reasonably allocated, and the functions that can be realized are diverse; the functions of interconnected call group group calling, interconnected channel dynamic allocation, interconnected call group modification, group call preemption, group call right allocation and handheld station roaming can be realized. The present invention uses a core converged Ethernet device to aggregate the multi-channel audio input and output from the gateway server, and can suppress the noise and echo of the received audio to a certain extent, so that the transmitted audio is clearer, the call quality is significantly improved, and the processed audio is finally output through a more stable network cable, which has extremely high innovation, scalability and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a connection diagram of the system of the present invention;

[0021] Figure 2 The figure is a connection diagram of the TETRA system of Motorola and Airbus of the present invention;

[0022] Figure 3 This is a circuit connection diagram of the core converged Ethernet switching device of the present invention;

[0023] Figure 4 A circuit diagram of a noise suppression processing module of a core converged Ethernet switching device of the present invention;

[0024] Figure 5 It is a schematic diagram of the internal flow of group calling of the TETRA system interconnection between Motorola and Airbus of the present invention;

[0025] Figure 6 This is a connection diagram of the Motorola and Airbus TETRA system interoperability test environment when testing the present invention;

[0026] Figure 7 This is a schematic diagram of the process of using the gateway server software to process a group call initiated by the Airbus system during the test of the present invention. DETAILED DESCRIPTION

[0027] The present invention is further described below through the test cases and the attached schematic diagrams, which are specifically described as follows: Figure 1 , Figure 2 As shown, the Motorola and Airbus TETRA interconnection system includes Internet gateway equipment, Motorola TETRA system, Airbus TETRA system and switches;

[0028] Motorola TETRA system consists of Motorola base station, Motorola CCGWⅠ, Motorola CCGWⅡ, Motorola original dispatching console, Motorola switch and Motorola handheld radio; Airbus TETREA system consists of Airbus base station, Airbus TVG server, core convergence Ethernet switching equipment Ⅰ, core convergence Ethernet switching equipment Ⅱ, Airbus switch and Airbus handheld radio; Internet gateway equipment consists of voice gateway, voice gateway and gateway server;

[0029] The motorcycle handheld radio is wirelessly connected to the motorcycle base station, the motorcycle base station is connected to the motorcycle CCGWⅠ and motorcycle CCGWⅡ respectively, the motorcycle CCGWⅠ and motorcycle CCGWⅡ are connected to the gateway server through the voice gateway and voice gateway respectively, and the motorcycle original dispatching station is connected to the motorcycle base station and gateway server respectively through the motorcycle switch;

[0030] The Airbus TVG server is connected to the core convergence Ethernet switching device I and the core convergence Ethernet switching device II respectively, the core convergence Ethernet switching device I and the core convergence Ethernet switching device II are connected to the gateway server respectively, the Airbus switch is connected to the Airbus base station, the Airbus TVG server, the core convergence Ethernet switching device I, the core convergence Ethernet switching device II and the gateway server respectively, the Airbus base station is wirelessly connected to the Airbus handheld radio; the motorcycle switch and the Airbus switch are connected to each other through the gateway server.

[0031] like Figure 3 , Figure 4 As shown, the core convergence Ethernet switching device I and the core convergence Ethernet switching device II have the same circuit structure, which consists of an input interface module, a noise suppression processing module, a power supply module and an output interface module. The noise suppression processing module is connected to the input interface module, the power supply module and the output interface module respectively. The specific circuit structure of the noise suppression processing module is as follows:

[0032] Pin 1 of the echo cancellation chip N1 is connected to one end of capacitor C11, pin 3 is connected to one end of capacitor C10, pin 40 is connected to one end of capacitor C9, pin 44 is connected to one end of capacitor C8, pin 34 is connected to one end of capacitor C7, pin 37 is connected to one end of capacitor C6, pin 46 is connected to one end of capacitor C5, and the other ends of capacitors C11, C10, C9, C8, C7, C6, and C5 are connected to GND-AL; pin 14 of the echo cancellation chip N1 is connected to one end of resistor R11 and resistor R15, pin 32 is connected to one end of resistor R17, pin 26 is connected to one end of resistor R20, and pin 25 is connected to one end of resistor R25. Pin 12 of chip N1 is connected to one end of resistor R9, pin 30 is connected to one end of resistor R10, pin 24 is connected to one end of resistor R12, pin 23 is connected to one end of resistor R16, pin 31 is connected to one end of resistor R18, pin 13 is connected to one end of resistor R21, pin 21 is connected to one end of resistor R27, pin 20 is connected to one end of resistor R28, the other end of resistors R15, R17, R20, R21, R25, R27 and R28 are connected to GND-AL, the other end of resistors R9, R10, R11, R12, R16 and R18 are connected to 3.3V power supply ; One end of resistor R2 is connected to a 3.3V power supply, and the other end is connected to one end of capacitor C3, capacitor C4 and pin 35 and pin 19 of echo cancellation chip N1, and the other ends of capacitor C3 and capacitor C4 are connected to GND-AL; one end of resistor R5 is connected to a 3.3V power supply, and the other end is connected to the collector of transistor VT1 through light-emitting diode VD1, the emitter of transistor VT1 is connected to GND-AL, and the base of transistor VT1 is connected to pin 22 of echo cancellation chip N1; pin 7 of echo cancellation chip N1 is connected to GND-AL through resistor R7, pin 18 is connected to GND-AL through resistor R19, and pin 29 is connected to GND through resistor R8 -AL, pin 38 is connected to GND-AL through resistor R4, pin 45 is connected to GND-AL through resistor R3, pin 15 of echo cancellation chip N1 is connected to one end of resistor R14 and pin 5 of memory N2, pin 16 is connected to one end of resistor R13 and pin 6 of memory N2, resistor R14 and the other end of resistor R13 are connected to pin 8 of echo cancellation chip N1 and 3.3V power supply, pin 1, pin 2 and pin 3 of echo cancellation chip N1 are connected to pin 4 of echo cancellation chip N1 and GND-DT through resistor R22, resistor R23 and resistor R24 ​​respectively, pin 7 of echo cancellation chip N1 is connected to GND-DT through resistor R26;

[0033] Pin 28 of the echo cancellation chip N1 is connected to one end of the capacitor C2 and pin 3 of the crystal oscillator Y1, the other end of the capacitor C2 is connected to pin 2 of the crystal oscillator Y1 and GND-AL, pin 1 of the crystal oscillator Y1 is connected to capacitor C1 and one end of the resistor R1, the other end of the resistor R1 is connected to pin 27 of the echo cancellation chip N1, and the other end of the capacitor C1 is connected to pin 4 of the crystal oscillator Y1 and GND-AL;

[0034] The model of the echo cancellation chip N1 is FM1288, the model of the memory N2 is AT24C64D, and the model of the crystal oscillator Y1 is 18.432 MHZ.

[0035] like Figure 6 As shown in the example test environment, Roland sound card I and Roland sound card II are used as voice gateway and voice gateway, and switches are added. The test environment is as follows:

[0036] The motorcycle base station is connected to the motorcycle CCGWⅠ, motorcycle CCGWⅡ and motorcycle switch through RJ45 Ethernet respectively. The core convergence Ethernet switching device Ⅰ is connected to the motorcycle CCGWⅠ through RJ45 Ethernet, and is connected to the Roland sound card Ⅰ through an analog audio cable. The core convergence Ethernet switching device Ⅱ is connected to the motorcycle CCGWⅡ through RJ45 Ethernet, and is connected to the Roland sound card Ⅱ through an analog audio cable. The Roland sound card Ⅰ and the Roland sound card Ⅱ are connected to the gateway server through USB cables respectively. The motorcycle original dispatch console is connected to the motorcycle switch through RJ45 Ethernet; the switch is connected to the core convergence Ethernet switching device Ⅰ, the core convergence Ethernet switching device Ⅱ and the gateway server through RJ45 Ethernet, and is connected to the motorcycle switch and the Airbus switch. The Airbus TVG server is connected to the Airbus switch through RJ45 Ethernet, and the Airbus switch is connected to the Airbus base station and the gateway server respectively; the Airbus handheld radio exchanges information with the Airbus base station through the wireless network; the motorcycle handheld radio exchanges information with the motorcycle base station through the wireless network; the motorcycle switch and the Airbus switch are connected through the switch.

[0037] The original dispatching console of Motorcycle is used to access the Motorcycle TETRA system, receive and send the signaling of the Motorcycle TETRA system, collect and analyze data, and reasonably allocate resources. The model of the original dispatching console of Motorcycle is MCC7500C; Motorcycle CCGWⅠ and Motorcycle CCGWⅡ are used to process the multi-channel voice transmitted to the Motorcycle system and to send and receive voice data to the gateway; the Motorcycle switch is used to exchange information between the switch and the Motorcycle dispatching console and to exchange and transmit data between systems; the Motorcycle base station is used to receive and transmit signals from the Airbus system and to transmit information at the same time; the Motorcycle handset is used to receive Airbus group calls or initiate group calls and make group voice calls; the Airbus TVG server is used to process the call right information of the Airbus group call; the Airbus base station is used to receive call requests from the handset and transmit the call requests to the Airbus TVG server;

[0038] Core convergence Ethernet switch I and core convergence Ethernet switch II are used to aggregate the multi-channel audio transmitted from the gateway server, and suppress the noise and echo of the received audio through its internal noise suppression module. The processed audio is transmitted through the network port, making the audio transmission clearer and more stable; the Airbus switch is used for the exchange and transmission of information between the interactive switch and the gateway server and the data between systems; the Roland sound card II is used to collect, encode, forward, decode and play the voice;

[0039] Roland sound card I is used to realize the forwarding processing of voice rights; the gateway server is used to log in to the system, obtain resources, and forward voice packets and signaling of the Motorola system and the Airbus system; the Airbus handset is used to receive Motorola group calls or initiate group calls and conduct group voice calls; the switch serves as a connecting bridge between the Motorola switch and the Airbus switch.

[0040] When the Motorcycle TETRA system and the Airbus TETRA system make a group call of the interconnected call group, the interconnection server receives the group call instruction from the signaling interface of the interconnection interface device of the call initiator. After receiving the instruction, the interconnection server will call the group call initiation interface of the receiving party's interconnection interface device and occupy the right to speak.

[0041] Example 1, during the specific implementation of the test, in order to prove that the interoperability between the motorcycle TETRA system and the Airbus TETRA system can be achieved, the group call initiated by the motorcycle handheld station and the group call initiated by the Airbus handheld station are tested respectively. During the test, the initiator applies for the group call through the handheld station, the receiving party can receive the group call request, and both parties can conduct voice calls normally through the handheld station.

[0042] First, a single talk group test is carried out. The Airbus radio and the motorcycle radio are selected into the same talk group. Two people are required to cooperate in the test, holding the motorcycle radio and the Airbus radio respectively. One of them uses the Airbus radio to initiate a group call. The group call information is transmitted to the Airbus base station through the wireless network. After receiving the group call information, the Airbus base station transmits the group call information to the gateway server and the Airbus TVG server through the Airbus switch. After receiving the tenant call information, the gateway server transmits the call information to the motorcycle switch through the switch. After receiving the group call information, the motorcycle switch sends it to the motorcycle base station. The motorcycle base station makes a group call The call group makes a judgment, and then transmits the group call information to the motorcycle radio through the wireless network. Finally, the motorcycle radio can receive the Airbus group call request. After the group call is connected, normal calls can be made, and the call voice signal is transmitted to Roland sound card I and Roland sound card II through the gateway server. After being processed by the core convergence Ethernet switching device I and the core convergence Ethernet switching device II, the voice signal is transmitted to the noise suppression processing module through the input interface module inside the core convergence Ethernet switching device, and the FM1288 chip N1 inside the noise suppression processing module reads the memory AT2 The preset parameters of the 4C64D chip N2 are used to process the input voice signal. The processed voice signal is output through the output interface module. The processed voice signal is transmitted to the motorcycle base station through the motorcycle CCGWⅠ and motorcycle CCGWⅡ and finally to the motorcycle hand-held radio, so that the call sound is clear. Then the handheld motorcycle hand-held radio initiates a group call application, and the group call information is transmitted to the motorcycle base station through the wireless network. After receiving the group call information, the motorcycle base station transmits the group call information to the motorcycle original dispatching station and switch through the motorcycle switch. Then the motorcycle original dispatching station transmits the call information through the switch. To the Airbus switch and gateway server, the motorcycle switch sends the group call information to the Airbus base station after receiving it, and the Airbus base station judges the group call talk group. After the judgment, the group call call information is transmitted to the Airbus handheld radio through the wireless network. Finally, the handheld Airbus handheld radio can receive the motorcycle group call application. After the group call is connected, normal calls can be made with clear sound. The single talk group test is over here; after that, multiple people use this method to conduct group call tests on single talk groups and multiple talk groups. The single talk group is a test for multiple people to conduct group call tests in turn, and the multi-talk is a test for multiple people to conduct group call tests at the same time.

[0043] The test results show that this method can be used to interconnect single or multiple talk groups, and the talk channels can be dynamically allocated according to the order of talk group calls. Due to limited conditions, only 8 talk groups were tested simultaneously. This method can theoretically realize the interconnection group call function to support 200 talk groups and 8 concurrent talk groups. The occupation of the talk right follows the principle of first come first served.

[0044] like Figure 5 As shown in the figure, the specific steps for interoperability testing are as follows:

[0045] 1. Group call initiated by Airbus radio:

[0046] a) The gateway server receives the group call initiation signaling from the TCS signaling interface of the Airbus interconnection interface device;

[0047] b) The gateway server calls the group call initiation interface of the motorcycle interconnection interface device to initiate the group call on the motorcycle side and occupy the voice right at the same time;

[0048] 2. Group call initiated by motorcycle radio:

[0049] c) The gateway server receives the group call initiation signaling from the motorcycle interconnection interface device;

[0050] d) The gateway server calls the group call initiation interface of the TCS signaling interface of the Airbus interconnection interface device to initiate the group call on the Airbus side and occupy the right to speak;

[0051] 3. Transmission of voice and voice rights from Airbus radio to motorcycle radio:

[0052] e) After the gateway server receives the speech right occupation signaling from the TCS signaling interface of the Airbus interconnection interface device, it calls the speech right occupation interface of the Motorcycle interconnection interface device;

[0053] f) The gateway server receives digital audio from the TVG voice interface of the Airbus interconnection interface device. If the motorcycle does not support digital audio, the gateway server converts the digital audio into the audio required by the motorcycle and transmits it to the audio interface of the motorcycle interconnection interface device;

[0054] 4. Transmission of voice and voice rights from motorcycle radio to Airbus radio:

[0055] g) After receiving the speech right occupation signaling from the motorcycle interconnection interface device, the gateway server calls the speech right occupation interface of the TCS signaling interface of the airbus interconnection interface device;

[0056] h) The gateway server receives analog audio from the motorcycle interconnection interface device. If the motorcycle is not digital audio, it converts the motorcycle audio into digital audio and transmits it to the TVG voice interface of the Airbus interconnection interface device;

[0057] 5. The principle of preempting the right to speak: follow the principle of first come first served.

[0058] like Figure 7 As shown, taking the test time and space guest side initiating a group call as an example, the API module and the management module are the background program packages of the software used, and the information processing flow is as follows:

[0059] a) The API module of the Airbus system receives the group call initiation information of the Airbus group sent by the TCS server, and then transmits the received group call initiation information to the management module of the Airbus system;

[0060] b) the Airbus system management module transmits the group call initiation information to the management module in the motorcycle system, and the management module of the motorcycle system finds the motorcycle talk group associated with it according to the received group call initiation information, and then transmits the motorcycle talk group information to the API module of the motorcycle system;

[0061] c) The API module of the motorcycle system initiates a motorcycle group call to the motorcycle original dispatch station, and after the API module receives a reply from the original dispatch station indicating that the motorcycle group call has been successfully created, it sends the reply to the management module of the motorcycle system;

[0062] d) The management module of the motorcycle system determines the associated group call information list to determine whether there is associated group call information corresponding to the received motorcycle talk group, and if so, updates the group call information list, otherwise, adds the group call information to the information list;

[0063] e) The management module of the Airbus system transmits the Airbus group call initiation information to the API module. After receiving the initiation information, the API module sends the Airbus group allocation voice channel to the TCS server;

[0064] f) After receiving the notification of allocated voice channel from TCS server, Airbus system API module sends it to system management module;

[0065] g) Finally, the Airbus system management module determines the associated group call information list to determine whether there is associated group call information corresponding to the received Airbus talk group. If so, the group call information list is updated. Otherwise, the group call information is added to the information list, and the information processing flow ends.

[0066] The above are only examples of experimental testing methods of the present invention, and the protection scope of the present invention is not limited to them.

Claims

1. A Motorola and Airbus TETRA interoperability system, characterized by: Including Internet gateway equipment, Motorola TETRA system, Airbus TETRA system and switches; The Internet gateway device is connected to the Motorola TETRA system and the Airbus TETRA system respectively; The switch connects the Motorola TETRA system with the Airbus TETRA system for information transmission and exchange; The Internet gateway device is used to exchange information transmitted from the Motorola TETRA system and the Airbus TETRA system, and to process the initiation and reception information and audio interaction transmitted to the Internet gateway device through software; The Motorola TETRA system is used to transmit and process information sent from the Airbus TETRA system; The Airbus TETRA system is used to transmit and process information sent by the Motorola TETRA party; The Motorola TETRA system is composed of a Motorola base station, a Motorola CCGWⅠ, a Motorola CCGWⅡ, a Motorola original dispatching console, a Motorola switch and a Motorola handheld console; The Airbus TETREA system is composed of an Airbus base station, an Airbus TVG server, a core converged Ethernet switching device I, a core converged Ethernet switching device II, an Airbus switch and an Airbus handheld station; the Internet gateway device is composed of a voice gateway, a voice gateway and a gateway server; the motorcycle handheld station is wirelessly connected to the motorcycle base station, the motorcycle base station is respectively connected to the motorcycle CCGW I and the motorcycle CCGW II, the motorcycle CCGW I and the motorcycle CCGW II are respectively connected to the gateway server through the voice gateway and the voice gateway, and the motorcycle original dispatch station is respectively connected to the motorcycle base station and the gateway server through the motorcycle switch; the Airbus TVG server is respectively connected to the core converged Ethernet switching device I and the core converged Ethernet switching device II, the core converged Ethernet switching device I and the core converged Ethernet switching device II are respectively connected to the gateway server, the Airbus switch is respectively connected to the Airbus base station, the Airbus TVG server, the core converged Ethernet switching device I, the core converged Ethernet switching device II and the gateway server, and the Airbus base station is wirelessly connected to the Airbus handheld station; the motorcycle switch and the Airbus switch are connected to each other through the gateway server; The core convergence Ethernet switching device I and the core convergence Ethernet switching device II have the same circuit structure, and are composed of an input interface module, a noise suppression processing module, a power supply module and an output interface module. The noise suppression processing module is connected to the input interface module, the power supply module and the output interface module respectively. The specific structure of the noise suppression processing module is as follows: Pin 1 of the echo cancellation chip N1 is connected to one end of capacitor C11, pin 3 is connected to one end of capacitor C10, pin 40 is connected to one end of capacitor C9, pin 44 is connected to one end of capacitor C8, pin 34 is connected to one end of capacitor C7, pin 37 is connected to one end of capacitor C6, pin 46 is connected to one end of capacitor C5, and the other ends of capacitors C11, C10, C9, C8, C7, C6, and C5 are connected to GND-AL; pin 14 of the echo cancellation chip N1 is connected to one end of resistor R11 and resistor R15, pin 32 is connected to one end of resistor R17, pin 26 is connected to one end of resistor R20, and pin 25 is connected to one end of resistor R25. Pin 12 of chip N1 is connected to one end of resistor R9, pin 30 is connected to one end of resistor R10, pin 24 is connected to one end of resistor R12, pin 23 is connected to one end of resistor R16, pin 31 is connected to one end of resistor R18, pin 13 is connected to one end of resistor R21, pin 21 is connected to one end of resistor R27, pin 20 is connected to one end of resistor R28, the other end of resistors R15, R17, R20, R21, R25, R27 and R28 are connected to GND-AL, the other end of resistors R9, R10, R11, R12, R16 and R18 are connected to 3.3V power supply ; One end of resistor R2 is connected to a 3.3V power supply, and the other end is connected to one end of capacitor C3, capacitor C4 and pin 35 and pin 19 of echo cancellation chip N1, and the other ends of capacitor C3 and capacitor C4 are connected to GND-AL; one end of resistor R5 is connected to a 3.3V power supply, and the other end is connected to the collector of transistor VT1 through light-emitting diode VD1, the emitter of transistor VT1 is connected to GND-AL, and the base of transistor VT1 is connected to pin 22 of echo cancellation chip N1; pin 7 of echo cancellation chip N1 is connected to GND-AL through resistor R7, pin 18 is connected to GND-AL through resistor R19, and pin 29 is connected to GND through resistor R8 -AL, pin 38 is connected to GND-AL through resistor R4, pin 45 is connected to GND-AL through resistor R3, pin 15 of echo cancellation chip N1 is connected to one end of resistor R14 and pin 5 of memory N2, pin 16 is connected to one end of resistor R13 and pin 6 of memory N2, resistor R14 and the other end of resistor R13 are connected to pin 8 of echo cancellation chip N1 and 3.3V power supply, pin 1, pin 2 and pin 3 of echo cancellation chip N1 are connected to pin 4 of echo cancellation chip N1 and GND-DT through resistor R22, resistor R23 and resistor R24 ​​respectively, pin 7 of echo cancellation chip N1 is connected to GND-DT through resistor R26; Pin 28 of the echo cancellation chip N1 is connected to one end of the capacitor C2 and pin 3 of the crystal oscillator Y1, the other end of the capacitor C2 is connected to pin 2 of the crystal oscillator Y1 and GND-AL, pin 1 of the crystal oscillator Y1 is connected to capacitor C1 and one end of the resistor R1, the other end of the resistor R1 is connected to pin 27 of the echo cancellation chip N1, and the other end of the capacitor C1 is connected to pin 4 of the crystal oscillator Y1 and GND-AL; The model of the echo cancellation chip N1 is FM1288, the model of the memory N2 is AT24C64D, and the model of the crystal oscillator Y1 is 18.432 MHZ.

2. A method for implementing the Motorola and Airbus TETRA interoperability system according to claim 1, characterized in that: Through the Motorola TETRA system and the Airbus TETRA system, standard protocol interfaces or customized development interfaces for interconnection are provided, and the Internet gateway equipment is used to access the central switching control system of the Motorola TETRA system and the Airbus TETRA system through Ethernet and voice interface equipment respectively. Through the authorized intervention of software, the voice status signaling and group call voice information conversion and forwarding are completed at the Internet gateway equipment to realize the interconnection of the two systems.

3. The method for implementing the Motorola and Airbus TETRA interoperability system according to claim 2, characterized in that: The method for interconnecting the two systems is as follows: When the Motorola TETRA system and the Airbus TETRA system conduct an inter-system group call, the group call information processing flow is as follows: the initiator uses the Motorola handheld radio or the Airbus handheld radio to apply for a group call initiation. First, the initiator's API module receives the group call initiation information from the Airbus TVG server or the Motorola original dispatching station, and transmits the group call initiation information to the initiator's management module; after receiving the group call initiation information, the initiator's management module transmits it to the receiver's management module; After receiving the group call initiation information, the receiver management module finds the receiving group associated with the initiation information, and then sends the receiving group information to the receiver's API module; the receiver API module initiates a group call to the Airbus TVG server or the motorcycle original dispatch station, and after the receiver receives the reply of the successful creation of the group call sent by the Airbus TVG server or the motorcycle original dispatch station, it sends it to the receiver management module; The receiving party management module determines whether there is any associated group information associated with the receiving group in the associated group call list; after the associated group exists, the initiator passes the group call initiation information to the API module, and the API module allocates a voice channel and sends it to the Airbus TVG server or the Motorola original dispatch station. When the API module receives the notification of the allocated voice channel result, it sends it to the management module, and then the management module determines whether there is any associated group group call information corresponding to the initiator in the associated group information list. If there is any associated group group call information, the associated group group call information list is updated; if not, the associated group group call information is added to the associated group group call information list. After the list is updated, the inter-system group call process ends; thereby, the Motorola TETRA system and the Airbus TETRA system are interconnected and interoperable.

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