CN113726412B - Multichannel satellite short message and Internet of things service exchange system - Google Patents
Multichannel satellite short message and Internet of things service exchange system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18515—Transmission equipment in satellites or space-based relays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/12—Messaging; Mailboxes; Announcements
- H04W4/14—Short messaging services, e.g. short message services [SMS] or unstructured supplementary service data [USSD]
Abstract
The invention discloses a multichannel satellite short message and Internet of things service exchange system, belonging to the technical field of data communication; the system comprises an antenna, a radio frequency front end, an antenna service channel, a control processing unit, a service processing unit and an interface processing unit; the antenna and the radio frequency unit are respectively connected to the all-weather service channel unit through radio frequency cables, the all-weather service channel unit is respectively connected to the control processing unit through asynchronous serial ports, the control processing unit is connected with the service processing unit through a CPCI bus, and the service processing unit is connected with the interface processing unit through the CPCI bus. The invention adopts an air interface link mode independent of gateway station forwarding, has strong independence and controllability, is convenient for hierarchical deployment and expansion, simultaneously adopts a multi-channel parallel mode for redundancy processing, and improves the exchange success rate. The short message service and the Internet of things service are supported, and an application platform can be provided for a small data volume user.
Description
Technical Field
The invention relates to the technical field of data communication, in particular to a multichannel satellite short message and Internet of things service exchange system.
Background
The satellite mobile communication system of heaven-through-one developed independently in China transmits 3 GEO satellites at present, covers all areas in China, such as territories, territories and two island chains, can provide all-weather, all-day, stable and reliable mobile communication services, and supports voice, short messages and data services. The satellite mobile communication system is used as a national strategic communication infrastructure and plays an important role in communication guarantee as a first emergency communication reactor in the fields of emergency, government, industrial application and the like.
At present, the internet of things system has wide application and is spread in a plurality of fields of intelligent transportation, environmental protection, government work, public safety, safe home, intelligent fire fighting, industrial monitoring, environmental monitoring, old people nursing, personal health, flower cultivation, water system monitoring, food traceability and the like. However, the network layer only adopts a ground mobile communication network, and is limited by regions, limited by terrains, and unable to defend natural disasters, and satellite communication can supplement the regional limitation, the limited terrains, and the unable to defend natural disasters. Therefore, the satellite mobile communication system of the 'Tiantong number one' develops a satellite internet of things system according to the characteristics of the internet of things service, and the internet of things service is added besides the original service.
At present, short message and internet of things service interaction between a satellite mobile communication system and a user application service center is completed in a private line mode from a satellite gateway station to the user application service center, and the short message and internet of things service interaction can be forwarded to other service systems through the user application service center. The method not only needs special line construction and lease cost, but also is limited by the capacity of an external interface of the satellite gateway station, and limits the number of application service centers of access users to a certain extent.
Disclosure of Invention
In view of this, the invention provides a multichannel satellite short message and internet of things service exchange system, which can operate independently without depending on data forwarding of a satellite gateway station, and has strong independent controllability and expansibility.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a multichannel satellite short message and Internet of things service switching system comprises an antenna; the system also comprises a radio frequency front end, an all-weather service channel, a control processing unit, a service processing unit and an interface processing unit;
the antenna and the radio frequency front end are provided with 4-channel branching and combining devices through 1 antenna, and the 4-channel branching and combining devices are used for carrying out branching and combining multiplexing on the radio frequency channels of the 4-channel antenna access service channel unit and realizing the simultaneous multi-channel transceiving of the radio frequency link;
the skyway service channel is used for completing analysis and protocol processing of the skyway channel and realizing signaling and service interaction in the skyway satellite system;
the management and control processing unit is used for managing and controlling the skynet service channel, and comprises a power-on mode, a network access instruction, a signal quality and an idle busy state, wherein the power-on mode is used for sending a network access instruction to the skynet service channel, the network access state, the signal quality and the idle busy state are detected in real time, and the detected network access state, the signal quality and the idle busy state are displayed to a user through the display module; simultaneously receiving service data of the skynet service channel and sending the service data to the skynet service channel in an idle state;
the service processing unit is used for completing analysis of satellite short messages and internet of things services, generating user data, storing the user data, displaying the user data, completing format translation of the satellite network and other network systems and sending the converted data to the interface processing unit;
the interface processing unit is used for realizing the intercommunication with short message and Internet of things services between other network systems and supporting multi-path kilomega Ethernet ports and optical ports;
the signal receiving and processing process comprises the following steps: after receiving the wireless signals, the antenna performs low-noise amplification processing on the signals and sends the signals to each skywalking service channel through a combiner/divider; the skynet service channel firstly demodulates and decodes the signal, then performs satellite signaling and service processing, completes the reception of standard skynet service data, and forwards the standard skynet service data to the control processing unit; the management and control processing unit translates the skyward service data according to the AT format and sends the skyward service data to the service processing unit through the CPCI bus; the service processing unit analyzes the satellite short message and the service of the Internet of things to generate user data, stores and displays the user data if the user data is the data of the system, and stores and displays the user data if the user data is the data of other network systems; then the packet is packed according to the unified frame format and is sent to the interface processing unit through the CPCI bus; the interface processing unit receives the data of the service processing unit and then sends the data to other network systems according to a TCP/IP protocol;
the signal transmission processing procedure comprises the following steps: a network interface of the interface processing unit receives short messages and Internet of things services of other network systems through a TCP/IP protocol and sends the short messages and the Internet of things services to the service processing unit through a CPCI bus; the service processing unit analyzes the data to be sent according to the uniform frame format after receiving the data to be sent to obtain user data, performs framing processing according to the service formats of the satellite short messages and the Internet of things, and sends the user data to the control processing unit through the CPCI bus; the management and control processing unit receives the data frame of the service processing unit, converts the data frame into a corresponding AT command according to the AT command format and sends the AT command to the skynman service channel unit; after receiving the AT command of the data to be sent, the skynet service channel unit completes the processes of service coding, modulation and the like according to the standard skynet service sending flow and sends the radio frequency signal to the combiner; the combiner sends the transmitting signal to the antenna through the feeder line, and the antenna amplifies the power and then transmits the power to the satellite.
Furthermore, the management and control processing unit software is also used for realizing UART transceiving, CPCI transceiving and AT format data translation; the management and control processing unit is connected with the skynet service channel through a 4-path UART interface and is used for finishing interaction of received or to-be-sent short messages and Internet of things services; in the process of signal transmission, the control processing unit firstly judges channels in an idle state in 4 skynet service channels, then sends data to the channels, and selects the channel with the least queuing number to wait if the channels are all busy; short message and internet of things service interaction is carried out with the service processing unit through the CPCI interface, so that subsequent service processing is realized, and the state is reported to a display mode;
the service processing unit is also used for format translation among different network systems and further forwarding to other network systems through the interface processing unit; in a unified frame format of different network system information exchange, a frame header mark of 4 bytes indicates the start of a short message and an Internet of things service frame; the frame length of 2 bytes represents the total number of bytes of the whole frame; the source address represents the telephone number of the service sending terminal and adopts a BCD coding format; the destination address represents the telephone number of the service receiving end and adopts a BCD coding format; the text content represents the actual service content, and the byte number is variable; the check is the checksum of all fields except the frame header identification.
When the service processing unit sends information to other network systems through the interface processing unit, the receiving party sends a receipt of successful receiving to the sending party after receiving the data, the timeout time of the receipt is 1 minute, if the sending party does not receive the receipt within 1 minute, the data is considered not to be sent to the receiving party system, the service processing unit controls repeated sending for 1 time, and the repeated sending for 3 times at most.
The invention adopts the technical scheme to produce the beneficial effects that:
1. the invention adopts the satellite air interface link to carry out user service interaction, can independently operate without depending on data forwarding of the satellite gateway station, and has strong independent controllability and expansibility.
2. The invention adopts the 4-channel skywalking link, thereby improving the service exchange capacity and the success rate.
3. The invention supports satellite short messages and Internet of things services and provides an application service platform for users with small data volume services.
4. The invention can not only carry out service interaction, but also carry out state monitoring and instruction issuing on the terminal in a short message or Internet of things service mode so as to complete remote control.
Drawings
FIG. 1 is a system block diagram of an embodiment of the present invention;
fig. 2 is a diagram of a configuration of a management control processing unit according to an embodiment of the present invention;
FIG. 3 is a service processing unit software composition diagram of an embodiment of the present invention;
FIG. 4 is a unified frame format diagram for different network system information exchanges according to an embodiment of the present invention;
fig. 5 is a system business process flow diagram of an embodiment of the invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
A multichannel satellite short message and Internet of things service switching system comprises an antenna; the system also comprises a radio frequency front end, an all-weather service channel, a control processing unit, a service processing unit and an interface processing unit;
the antenna and the radio frequency front end are provided with 4-channel branching and combining devices through 1 antenna, and the 4-channel branching and combining devices are used for carrying out branching and combining multiplexing on the radio frequency channels of the 4-channel antenna access service channel unit and realizing the simultaneous multi-channel transceiving of the radio frequency link;
the skyway service channel is used for completing analysis and protocol processing of the skyway channel and realizing signaling and service interaction in the skyway satellite system;
the management and control processing unit is used for managing and controlling the skynet service channel, and comprises a starting-up unit, a network access instruction sending unit, a display module and a network access control unit, wherein the network access instruction sending unit is used for sending a network access instruction to the skynet service channel, detecting a network access state, signal quality and a busy state in real time and displaying the network access state, the signal quality and the busy state to a user; simultaneously receiving service data of the skynet service channel and sending the service data to the skynet service channel in an idle state;
the service processing unit is used for completing analysis of satellite short messages and internet of things services, generating user data, storing the user data, displaying the user data, completing format translation of the satellite network and other network systems and sending the converted data to the interface processing unit;
the interface processing unit is used for realizing the intercommunication with short message and Internet of things services between other network systems and supporting multi-path kilomega Ethernet ports and optical ports;
the signal receiving and processing process comprises the following steps: after receiving the wireless signals, the antenna performs low-noise amplification processing on the signals and sends the signals to each skywalking service channel through a combiner/divider; the skynet service channel firstly demodulates and decodes the signal, then performs satellite signaling and service processing, completes the reception of standard skynet service data, and forwards the standard skynet service data to the control processing unit; the management and control processing unit translates the skyward service data according to the AT format and sends the skyward service data to the service processing unit through the CPCI bus; the service processing unit analyzes the satellite short message and the service of the Internet of things to generate user data, stores and displays the user data if the user data is the data of the system, and stores and displays the user data if the user data is the data of other network systems; packing according to a uniform frame format, and sending to an interface processing unit through a CPCI bus; the interface processing unit receives the data of the service processing unit and then sends the data to other network systems according to a TCP/IP protocol;
the signal transmission processing procedure comprises the following steps: a network interface of the interface processing unit receives short messages and Internet of things services of other network systems through a TCP/IP protocol and sends the short messages and the Internet of things services to the service processing unit through a CPCI bus; the service processing unit analyzes the data to be sent according to a uniform frame format after receiving the data to be sent to obtain user data, performs framing processing according to satellite short messages and the service format of the Internet of things, and sends the user data to the control processing unit through the CPCI bus; the management and control processing unit receives the data frame of the service processing unit, converts the data frame into a corresponding AT command according to the AT command format and sends the AT command to the skynman service channel unit; after receiving the AT command of the data to be sent, the skynet service channel unit completes the processes of service coding, modulation and the like according to the standard skynet service sending flow and sends the radio frequency signal to the combiner; the combiner sends the transmitting signal to the antenna through the feeder line, and the antenna amplifies the power and then transmits the power to the satellite.
Furthermore, the management and control processing unit software is also used for realizing UART transceiving, CPCI transceiving and AT format data translation; the management and control processing unit is connected with the skynet service channel through a 4-path UART interface and is used for finishing interaction of received or to-be-sent short messages and Internet of things services; in the signal sending processing process, the control processing unit firstly judges channels in an idle state in 4 heaven-earth service channels, then sends data to the channels, and selects the channel with the least queuing number to wait if the channels are all busy; short message and internet of things service interaction is carried out with the service processing unit through the CPCI interface, so that subsequent service processing is realized, and the state is reported to a display mode;
the service processing unit is also used for format translation among different network systems and further forwarding to other network systems through the interface processing unit; in a unified frame format of different network system information exchange, a frame header mark of 4 bytes indicates the start of a short message and an Internet of things service frame; the frame length of 2 bytes represents the total number of bytes of the whole frame; the source address represents the telephone number of the service sending terminal and adopts a BCD coding format; the destination address represents the telephone number of the service receiving end and adopts a BCD coding format; the text content represents the actual service content, and the byte number is variable; the check is the checksum of all fields except the frame header identification.
When the service processing unit sends information to other network systems through the interface processing unit, the receiving party sends a receipt of successful receiving to the sending party after receiving the data, the timeout time of the receipt is 1 minute, if the sending party does not receive the receipt within 1 minute, the data is considered not to be sent to the receiving party system, the service processing unit controls repeated sending for 1 time, and the repeated sending for 3 times at most.
The following is a more specific example:
referring to fig. 1 to 5, the present embodiment includes an antenna, a radio frequency front end, an skywalking service channel, a management and control processing unit, a service processing unit, and an interface processing unit; the antenna and the radio frequency unit are respectively connected to an all-weather service channel unit through radio frequency cables, the all-weather service channel unit is respectively connected to a control processing unit through an asynchronous serial port, the control processing unit is connected with the service processing unit through a CPCI bus, and the service processing unit is connected with an interface processing unit through the CPCI bus;
the antenna and the radio frequency front end adopt 1 antenna, are provided with 4-channel branching and combining devices, and carry out branching and combining multiplexing design on the radio frequency channels of the 4-channel antenna access service channel unit, thereby realizing the multi-channel simultaneous transceiving function of a radio frequency link;
the skywalking service channel unit is a skywalking communication module with independent property rights in China, comprises a radio frequency chip and a baseband chip, completes analysis and protocol processing of skywalking channels and realizes signaling and service interaction in a skywalking satellite system;
the management and control processing unit is used for managing and controlling the 4-channel skynman communication module, and comprises a starting-up unit, a network access instruction is sent to the skynman communication module, the network access state, the signal quality and the idle busy state are detected in real time, and the detected state is presented to a user through the display module; simultaneously receiving the service data of the 4-channel skynman communication module and sending the service data to a certain channel in an idle state;
the service processing unit completes analysis of satellite short messages and internet of things services, generates user data, stores the user data, displays the user data, completes format translation of the satellite network and other network systems and sends the format translation to the rear-end interface processing unit;
the interface processing unit supports multi-path kilomega Ethernet ports and optical ports, and realizes the service intercommunication with short messages and Internet of things among other network systems at the back end.
Designing main software of a control processing unit: the management and control processing unit is connected with the skynet service channel unit through a 4-path UART interface to complete interaction of received or to-be-sent short messages and Internet of things services; when data is sent, the control processing unit firstly judges channels in an idle state in 4 skynet service channels, then sends the data to the channels, and selects the channel with the least queuing number to wait if the channels are all busy; and the CPCI interface and the service processing unit are used for carrying out short message and Internet of things service interaction so as to realize subsequent service processing and report the state to the display mode. The management and control processing unit software mainly comprises functions of UART transceiving, CPCI transceiving, AT format data translation, skyward service channel unit monitoring, skyward service channel unit control and the like.
Main software design of the service processing unit: the service processing unit completes the short message service processing and the Internet of things service processing, performs format translation among different network systems, and then forwards the short message service processing and the Internet of things service processing to other network systems through the back end unit. The short message and the internet of things service formats between different network systems are different, and the short message and the internet of things service formats are translated according to a uniform frame format before being forwarded and then sent to an interface processing unit for subsequent processing. The 4-byte frame header identification in the unified frame format of different network system information exchanges indicates the start of short messages and service frames of the Internet of things; the frame length of 2 bytes represents the total number of bytes of the whole frame; the source address represents the telephone number of the service sending terminal and adopts a BCD coding format; the destination address represents the telephone number of the service receiving end and adopts a BCD coding format; the text content represents the actual service content, and the byte number is variable; the check is the checksum of all fields except the frame header identification.
When the service processing unit sends information to other network systems, the receiving party sends a receipt of successful receiving to the sending party after receiving the data, the timeout time of the receipt is 1 minute, if the sending party does not receive the receipt within 1 minute, the data is considered not to be sent to the receiving party system, the service processing unit controls the retransmission for 1 time, and the retransmission is repeated for 3 times at most.
Short message and internet of things service receiving and processing processes:
(1) the antenna receives the wireless signal of the service channel to perform low-noise amplification processing, and sends the wireless signal to each skyway service channel unit through the combiner/divider;
(2) the skynet service channel unit firstly demodulates and decodes the signal, then performs processes such as satellite signaling and service processing, and the like, completes the reception of standard skynet service data, and forwards the standard skynet service data to the control processing unit;
(3) the management and control processing unit translates the skyward service data according to the AT format and sends the skyward service data to the service processing unit through the CPCI bus;
(4) the service processing unit analyzes the satellite short message and the service of the Internet of things to generate user data, stores and displays the user data if the user data is the data of the system, and stores and displays the user data if the user data is the data of other network systems; then the packet is packed according to the unified frame format and is sent to the interface processing unit through the CPCI bus;
(5) the interface processing unit receives the data of the service processing unit and then sends the data to other network systems according to the TCP/IP protocol.
The short message and the service of the Internet of things are sent and processed: a network interface of the interface processing unit receives short messages and Internet of things services of other network systems through a TCP/IP protocol and sends the short messages and the Internet of things services to the service processing unit through a CPCI bus; the service processing unit analyzes the data to be sent according to a uniform frame format after receiving the data to be sent to obtain user data, performs framing processing according to satellite short messages and the service format of the Internet of things, and sends the user data to the control processing unit through the CPCI bus; the management and control processing unit receives the data frame of the service processing unit, converts the data frame into a corresponding AT command according to the AT command format and sends the AT command to the skynman service channel unit; after receiving the AT command of the data to be sent, the skynet service channel unit completes the processes of service coding, modulation and the like according to the standard skynet service sending flow and sends the radio frequency signal to the combiner; the combiner sends the transmitting signal to the antenna through the feeder line, and the antenna amplifies the power and then transmits the power to the satellite.
Claims (2)
1. A multichannel service switching system for satellite short messages and Internet of things comprises an antenna; the system is characterized by also comprising a radio frequency front end, an all-weather service channel, a control processing unit, a service processing unit and an interface processing unit;
the antenna and the radio frequency front end are provided with 4-channel branching and combining devices through 1 antenna, and the 4-channel branching and combining devices are used for carrying out branching and combining multiplexing on the radio frequency channels of the 4-channel antenna access service channel unit and realizing the simultaneous multi-channel transceiving of the radio frequency link;
the skyway service channel is used for completing analysis and protocol processing of the skyway channel and realizing signaling and service interaction in the skyway satellite system;
the management and control processing unit is used for managing and controlling the skynet service channel, and comprises a starting-up unit, a network access instruction sending unit, a display module and a network access control unit, wherein the network access instruction sending unit is used for sending a network access instruction to the skynet service channel, detecting a network access state, signal quality and a busy state in real time and displaying the network access state, the signal quality and the busy state to a user; simultaneously receiving service data of the skynet service channel and sending the service data to the skynet service channel in an idle state;
the service processing unit is used for completing analysis of satellite short messages and internet of things services, generating user data, storing the user data, displaying the user data, completing format translation of the satellite network and other network systems and sending the converted data to the interface processing unit;
the interface processing unit is used for realizing the intercommunication with short message and Internet of things services between other network systems and supporting multi-path kilomega Ethernet ports and optical ports;
the signal receiving and processing process comprises the following steps: after receiving the wireless signals, the antenna performs low-noise amplification processing on the signals and sends the signals to each skywalking service channel through a combiner/divider; the skynet service channel firstly demodulates and decodes the signal, then performs satellite signaling and service processing, completes the reception of standard skynet service data, and forwards the standard skynet service data to the control processing unit; the management and control processing unit translates the skyward service data according to the AT format and sends the skyward service data to the service processing unit through the CPCI bus; the service processing unit analyzes the satellite short messages and the Internet of things service to generate user data, stores and displays the user data if the user data is the system data, packages the user data according to a uniform frame format if the user data is other network system data, and sends the user data to the interface processing unit through the CPCI bus; the interface processing unit receives the data of the service processing unit and then sends the data to other network systems according to a TCP/IP protocol;
the signal transmission processing procedure comprises the following steps: a network interface of the interface processing unit receives short messages and Internet of things services of other network systems through a TCP/IP protocol and sends the short messages and the Internet of things services to the service processing unit through a CPCI bus; the service processing unit analyzes the data to be sent according to the uniform frame format after receiving the data to be sent to obtain user data, performs framing processing according to the service formats of the satellite short messages and the Internet of things, and sends the user data to the control processing unit through the CPCI bus; the management and control processing unit receives the data frame of the service processing unit, converts the data frame into a corresponding AT command according to the AT command format and sends the AT command to the skynman service channel unit; after receiving the AT command of the data to be sent, the skynet service channel unit completes the service coding and modulation processes according to the standard skynet service sending flow and sends the radio frequency signal to the branching and combining device; the combiner sends the transmitting signal to the antenna through the feeder line, and the antenna amplifies the power and then transmits the power to the satellite.
2. The multi-channel service switching system for satellite short messages and internet of things of claim 1, wherein the management and control processing unit software is further configured to implement UART transceiving, CPCI transceiving, and AT format data translation; the management and control processing unit is connected with the skynet service channel through a 4-path UART interface and is used for finishing interaction of received or to-be-sent short messages and Internet of things services; in the process of signal transmission, the control processing unit firstly judges channels in an idle state in 4 skynet service channels, then sends data to the channels, and selects the channel with the least queuing number to wait if the channels are all busy; short message and internet of things service interaction is carried out with the service processing unit through the CPCI interface, so that subsequent service processing is realized, and the state is reported to a display mode;
the service processing unit is also used for format translation among different network systems and further forwarding to other network systems through the interface processing unit; in a unified frame format of different network system information exchange, a frame header mark of 4 bytes indicates the start of a short message and an Internet of things service frame; the frame length of 2 bytes represents the total number of bytes of the whole frame; the source address represents the telephone number of the service sending terminal and adopts a BCD coding format; the destination address represents the telephone number of the service receiving end and adopts a BCD coding format; the text content represents the actual service content, and the byte number is variable; the check is the check sum of all fields except the frame header identification;
when the service processing unit sends information to other network systems through the interface processing unit, the receiving party sends a receipt of successful receiving to the sending party after receiving the data, the timeout time of the receipt is 1 minute, if the sending party does not receive the receipt within 1 minute, the data is considered not to be sent to the receiving party system, the service processing unit controls repeated sending for 1 time, and the repeated sending for 3 times at most.
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| CN114567368A (en) * | 2022-02-18 | 2022-05-31 | 中国电子科技集团公司第五十四研究所 | Multi-user concurrent access equipment of heaven-earth system and communication method thereof |
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