CN114095613A - Voice service system and method based on E1 private line and user algorithm safety guarantee - Google Patents
Voice service system and method based on E1 private line and user algorithm safety guarantee Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/42136—Administration or customisation of services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
- H04M7/0066—Details of access arrangements to the networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
- H04M7/0078—Security; Fraud detection; Fraud prevention
Abstract
The invention discloses a voice service system and a method based on E1 private line and user algorithm safety guarantee, comprising a user specific voice terminal, a satellite gateway station, a special voice gateway and an internal telephone network; the user specific voice terminal realizes air interface interaction with the satellite gateway station through a satellite, the satellite gateway station is connected with the special voice gateway through an E1 private line, and the internal telephone network is connected with the heaven-through special voice gateway through an E1 interface. The method includes E1 private line voice bearer and dedicated voice gateway processing design, and communication flow between the user specific voice terminal and the internal telephone network. The invention does not change the standard, system equipment and normal operation of the satellite system, is convenient to implement and has better maintainability and operability; the E1 private line is adopted to isolate other users, the user security protection is increased, and the security and reliability of the voice service of the user are ensured to a greater extent; the number of E1 private lines can be expanded to provide services to more users.
Description
Technical Field
The invention relates to a voice private network system developed on the basis of a general satellite mobile communication system aiming at the voice safety requirements of users, belonging to the technical field of satellite mobile communication.
Background
The satellite mobile communication system of "Tiantong number one" is the first generation of high orbit satellite mobile communication system which is independently controllable in China, and can provide voice, short message and low speed data service. At present, 3 GEO satellites are launched by the system to cover all areas in China within the territory, the territory and the two-island chain, and the heaven-Tong satellite mobile communication system is used as a national strategic communication infrastructure and plays an important communication guarantee role as a first reactor of emergency communication in the fields of emergency, government, industrial application and the like.
However, since the radio signal can be captured in the satellite mobile communication process and then various subsequent processes are performed to obtain the digital signal, so that the security and confidentiality of the user service are challenged, it is not sufficient to rely on the security guarantee of the satellite mobile system itself in some specific fields, and an algorithm with higher security specific to the user needs to be added on the basis.
Therefore, while developing the satellite mobile communication system in China, a scheme and a system which can be added with a user security algorithm are urgently needed to be designed on the basis of not changing the operation of the system so as to meet the voice security requirements of users in a specific industry.
Disclosure of Invention
Aiming at the safety requirement of voice service of a user of an aerospace satellite mobile communication system, the invention provides a voice service scheme and a system based on double safety guarantees of an E1 private line and a user algorithm.
The technical scheme adopted by the invention is as follows:
a voice service system based on E1 private line and user algorithm double safety guarantee, comprising a voice terminal, a satellite gateway station, a special voice gateway and an internal telephone network; the voice terminal realizes the air interface information interaction with the satellite gateway station through a satellite, the satellite gateway station is connected with the special voice gateway through an E1 private line, and the internal telephone network is interconnected with the special voice gateway through an E1 interface;
the voice terminal is used for carrying out security processing on user voice data during sending, coding the user voice data according to a satellite communication protocol, and forwarding the coded voice data to a satellite gateway station through a satellite; the system is also used for decoding the received voice data of the satellite gateway station forwarded by the satellite during receiving, and then carrying out security processing to restore the user voice;
the satellite gateway station is used for transparently transmitting voice according to the number of an internal telephone network, carrying the voice transmitted by the voice terminal to an E1 private line by designing a frame format and forwarding the voice to a special voice gateway; the voice is received from the special voice gateway through an E1 private line, then is restored according to a specific frame format and is forwarded to a corresponding user specific terminal;
the special voice gateway is used for analyzing data borne on a special line E1 from a satellite gateway station to obtain voice data, restoring a user safety algorithm, decoding according to a satellite standard, converting the voice data into PCM data, and forwarding to an internal telephone network through an E1 interface; the system is also used for receiving PCM data of an internal telephone network through an E1 port, then carrying out coding processing according to the satellite standard, adding a user security algorithm, carrying the PCM data on an E1 private line and sending the PCM data to a satellite gateway station;
the internal telephone network is used for receiving PCM data from the special voice gateway and forwarding voice to the fixed telephone in the network; and also for receiving voice of the fixed telephone within the network and then forwarding the PCM data to the dedicated voice gateway.
The design frame format comprises a frame head, a data length, a voice rate, voice data and a check field; the frame header field indicates the beginning of the voice data frame, the data length indicates the total byte number of the data frame, the voice rate indicates the satellite voice coding rate value of the current transmission, the voice data is the voice data of the actual user, and the check field is the CRC check of all data from the beginning of the frame header to the end of the voice data.
Wherein, the special voice gateway comprises a receiving channel and a sending channel; the receiving channel comprises a serial-parallel conversion module, a channel descrambling module, an E1 time slot separation module, a frame header searching module, a voice extraction module, a user security processing module and a satellite voice decoding module; the transmitting channel comprises a satellite voice coding module, a user safety processing module, a voice filling module, a framing module, an E1 time slot multiplexing module, a channel scrambling module and a parallel-serial conversion module;
a channel receiving processing process:
the serial-to-parallel conversion module is used for carrying out serial E1 data bit stream-to-byte conversion on the received voice data frames;
the channel descrambling module is used for descrambling the channel data of the data after the serial-parallel conversion;
the E1 time slot separation module is used for separating and extracting 32 time slot data in the E1 link from the descrambled data;
the frame header searching module is used for searching a voice data frame header in the separated and extracted data and positioning the position where the voice exists;
the voice extraction module is used for extracting voice data according to a specific frame format after the frame header search is finished, and performing redundant processing on repeated voice;
the user safety processing module is used for carrying out safety processing on the extracted voice data according to a user algorithm;
the satellite voice decoding module is used for converting the voice data after the security processing into standard PCM data according to a satellite standard and forwarding the standard PCM data to an internal telephone network through an E1 interface;
a channel processing process:
the satellite voice coding module is used for coding the PCM data of the internal telephone network according to a satellite standard;
the user security processing module is used for adding the encoded data into a user security algorithm;
the voice filling module is used for converting the voice data into voice data according to a specific frame format;
the framing module is used for adding voice data into a voice data frame header to perform framing;
the E1 time slot multiplexing module is used for multiplexing the voice data after framing with 32 time slot data in the E1 link;
the channel scrambling module is used for scrambling the multiplexed voice data;
the parallel-to-serial conversion module is used for converting the scrambled voice data into a serial E1 data bit stream.
A voice service method based on E1 private line and user algorithm double safety guarantee includes the following processes:
communication flow from voice terminal to internal telephone network:
(1) the voice terminal completes the establishment of a service channel with a fixed telephone in an internal telephone network through a call establishment process;
(2) the voice terminal encodes the voice according to the satellite format, performs security processing on the encoded voice according to a user algorithm, and then forwards the encoded voice to a satellite gateway station through a satellite;
(3) the satellite gateway station transparently transmits the voice according to the number of the internal telephone network, and loads the voice to an E1 private line connected with a special voice gateway through a design frame format, and forwards the voice to the special voice gateway;
(4) the special voice gateway analyzes the data loaded on the E1, extracts the voice data, then carries out user algorithm reduction, completes the conversion from the voice to the standard PCM data according to the satellite standard, and forwards the data to the internal telephone network through an E1 interface;
(5) the internal telephone network forwards the PCM data to the fixed telephone in the network;
communication flow from the internal telephone network to the voice terminal:
(1) the fixed telephone and the voice terminal in the internal telephone network complete the establishment of a service channel through a call establishment process;
(2) the internal telephone network converts the voice of the fixed telephone in the network into PCM data and sends the PCM data to the special voice gateway through an E1 port;
(3) the special voice gateway receives PCM data from an E1 interface of an internal telephone network, codes according to a satellite standard, adds a user algorithm, and then loads the PCM data onto an E1 circuit connected with a satellite gateway station according to a designed frame format;
(4) the satellite gateway station receives E1 line data from the special voice gateway, obtains voice data of a corresponding terminal according to a designed frame format, transmits the voice data to a transmitting terminal and then sends the voice data to the satellite;
(5) the voice terminal receives the gateway station data forwarded through the satellite, performs security restoration on the voice according to a user algorithm, and then decodes the voice according to the satellite format to restore the voice.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the method is based on the standard satellite mobile communication system flow, does not change the system standard, system equipment and normal commercial operation process, is convenient to implement, and has better maintainability and operability;
2. the invention adopts E1 special line to carry, and adds a layer of user safety protection, thereby enhancing the safety of user service in multiple layers on the basis of the original system;
3. the invention can expand the user number by increasing the number of E1 private lines, can configure different fixed number segments, and can be communicated with other types of telephone networks (such as IP telephone networks) through a special voice gateway.
Drawings
FIG. 1 is a system block diagram of an embodiment of the present invention;
FIG. 2 is a diagram of a frame format component of an embodiment of the present invention;
FIG. 3 is a flow diagram of a business process of an embodiment of the invention;
fig. 4 is a voice flow diagram of an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
example 1:
a voice service system based on E1 private line and user algorithm double safety guarantee, comprising a voice terminal, a satellite gateway station, a special voice gateway and an internal telephone network; as shown in fig. 1 and 4, the voice terminal implements air interface information interaction with the satellite gateway station through a satellite, the satellite gateway station is connected with the dedicated voice gateway through an E1 private line, and the internal telephone network is interconnected with the dedicated voice gateway through an E1 interface;
the voice terminal comprises a satellite communication unit and a user algorithm unit, wherein the user algorithm unit firstly carries out security processing on voice data, and then the communication unit carries out signaling and voice interaction with a satellite gateway station according to a satellite communication protocol to realize wireless communication;
the satellite gateway station is mainly used for participating in completing voice forwarding of a user specific terminal in the system, and is different from a voice processing mode of a general terminal, voice of the user specific voice terminal is not converted between satellite coded voice and standard PCM coded voice, but is directly carried to an E1 private line through a specific format and forwarded to a back-end special voice gateway device for processing; the voice is received from the special voice gateway through an E1 private line, then is restored according to a specific frame format and is forwarded to a corresponding user specific terminal;
the special voice gateway is used for receiving data of the satellite gateway station through an E1 private line, carrying and matching satellite voice data frames with standard E1 data frames according to a design format, analyzing to obtain satellite voice data, executing a user security algorithm, carrying out coding and decoding processing according to a satellite standard to convert the satellite voice data into PCM data, and forwarding the PCM data to an internal telephone network through an E1 interface; the system is also used for receiving PCM data of an internal telephone network through an E1 port, then carrying out coding processing according to the satellite standard, adding a user security algorithm, carrying the PCM data on an E1 private line and sending the PCM data to a satellite gateway station;
the internal telephone network is used for realizing the intercommunication between the fixed telephone and the special voice gateway in the network.
Example 2:
for the voice service system based on dual security guarantee of the E1 private line and the user algorithm in the technical scheme one, the E1 private line voice bearer and the dedicated voice gateway processing design:
the data length carried by each 60ms in the standard E1 protocol is 480 bytes, while the maximum data of each 60ms in the three-rate voice of the satellite is only 30 bytes, so that the bearer matching is required to be carried according to a certain transmission format during the transmission process.
Referring to fig. 2, the format-specific data frame designed by the present invention includes a frame header, a data length, a voice rate, voice data, and a checksum. The frame header field indicates the beginning of the voice data frame, the data length indicates the total byte number of the data frame, the voice rate indicates the satellite voice coding rate value of the current transmission, the voice data is the voice data of the actual user, and the check field is the CRC check of all data from the beginning of the frame header to the end of the voice data. In order to further improve the data accuracy, each frame of voice data is continuously repeated three times on an E1 channel, the rest is filled with zeros, and meanwhile, in order to ensure the burst error resistance of channel transmission, scrambling processing is carried out on the data in the channel transmission process.
As shown in fig. 3, after receiving the E1 private line data, the dedicated voice gateway sequentially performs the following processing:
a channel receiving processing process:
the serial-to-parallel conversion module is used for carrying out serial E1 data bit stream-to-byte conversion on the received voice data frames;
the channel descrambling module is used for descrambling the channel data of the data after the serial-parallel conversion;
the E1 time slot separation module is used for separating and extracting 32 time slot data in the E1 link from the descrambled data;
the frame header searching module is used for searching a voice data frame header in the separated and extracted data and positioning the position where the voice exists;
the voice extraction module is used for extracting voice data according to a specific frame format after the frame header search is finished, and performing redundant processing on repeated voice;
the user safety processing module is used for carrying out safety processing on the extracted voice data according to a user algorithm;
the satellite voice decoding module is used for converting the voice data after the security processing into standard PCM data according to a satellite standard and forwarding the standard PCM data to an internal telephone network through an E1 interface;
a channel processing process:
the satellite voice coding module is used for coding the PCM data of the internal telephone network according to a satellite standard;
the user security processing module is used for adding the encoded data into a user security algorithm;
the voice filling module is used for converting the voice data into voice data according to a specific frame format;
the framing module is used for adding voice data into a voice data frame header to perform framing;
the E1 time slot multiplexing module is used for multiplexing the voice data after framing with 32 time slot data in the E1 link;
the channel scrambling module is used for scrambling the multiplexed voice data;
the parallel-to-serial conversion module is used for converting the scrambled voice data into a serial E1 data bit stream.
Example 3:
in the voice service method based on dual security guarantee of the E1 private line and the user algorithm, a communication flow between the user-specific voice terminal and the internal telephone network is as follows:
communication flow from voice terminal to internal telephone network:
(1) the voice terminal completes the establishment of a service channel with a fixed telephone in an internal telephone network through a call establishment process;
(2) the voice terminal encodes the voice according to the satellite format, performs security processing on the encoded voice according to a user algorithm, and then forwards the encoded voice to a satellite gateway station through a satellite;
(3) the satellite gateway station transparently transmits the voice according to the number of the internal telephone network, and loads the voice to an E1 private line connected with a special voice gateway through a design frame format, and forwards the voice to the special voice gateway;
(4) the special voice gateway analyzes the data loaded on the E1, extracts the voice data, then carries out user algorithm reduction, completes the conversion from the voice to the standard PCM data according to the satellite standard, and forwards the data to the internal telephone network through an E1 interface;
(5) the internal telephone network forwards the PCM data to the fixed telephone in the network;
communication flow from the internal telephone network to the voice terminal:
(1) the fixed telephone and the voice terminal in the internal telephone network complete the establishment of a service channel through a call establishment process;
(2) the internal telephone network converts the voice of the fixed telephone in the network into PCM data and sends the PCM data to the special voice gateway through an E1 port;
(3) the special voice gateway receives PCM data from an E1 interface of an internal telephone network, codes according to a satellite standard, adds a user algorithm, and then loads the PCM data onto an E1 circuit connected with a satellite gateway station according to a designed frame format;
(4) the satellite gateway station receives E1 line data from the special voice gateway, obtains voice data of a corresponding terminal according to a designed frame format, transmits the voice data to a transmitting terminal and then sends the voice data to the satellite;
(5) the voice terminal receives the gateway station data forwarded through the satellite, performs security restoration on the voice according to a user algorithm, and then decodes the voice according to the satellite format to restore the voice.
The special voice gateway equipment opens the user-defined safety algorithm processing to the user, and the algorithm of the special voice gateway equipment has confidentiality, so the equipment adopts a modularized and multi-layer architecture, defines interfaces among modules, and isolates a general processing part and a user processing part from hardware, so that each module can be independently developed and tested, and further, the equipment integration is carried out to complete the whole function.
Claims (4)
1. A voice service system based on E1 private line and user algorithm double safety guarantee is characterized in that: the system comprises a voice terminal, a satellite gateway station, a special voice gateway and an internal telephone network; the voice terminal realizes the air interface information interaction with the satellite gateway station through a satellite, the satellite gateway station is connected with the special voice gateway through an E1 private line, and the internal telephone network is interconnected with the special voice gateway through an E1 interface;
the voice terminal is used for carrying out security processing on user voice data during sending, coding the user voice data according to a satellite communication protocol, and forwarding the coded voice data to a satellite gateway station through a satellite; the system is also used for decoding the received voice data of the satellite gateway station forwarded by the satellite during receiving, and then carrying out security processing to restore the user voice;
the satellite gateway station is used for transparently transmitting voice according to the number of an internal telephone network, carrying the voice transmitted by the voice terminal to an E1 private line by designing a frame format and forwarding the voice to a special voice gateway; the voice is received from the special voice gateway through an E1 private line, then is restored according to a specific frame format and is forwarded to a corresponding user specific terminal;
the special voice gateway is used for analyzing data borne on a special line E1 from a satellite gateway station to obtain voice data, restoring a user safety algorithm, decoding according to a satellite standard, converting the voice data into PCM data, and forwarding to an internal telephone network through an E1 interface; the system is also used for receiving PCM data of an internal telephone network through an E1 port, then carrying out coding processing according to the satellite standard, adding a user security algorithm, carrying the PCM data on an E1 private line and sending the PCM data to a satellite gateway station;
the internal telephone network is used for receiving PCM data from the special voice gateway and forwarding voice to the fixed telephone in the network; and also for receiving voice of the fixed telephone within the network and then forwarding the PCM data to the dedicated voice gateway.
2. The dual security voice service system according to claim 1, wherein the system comprises: designing a frame format to comprise a frame header, a data length, a voice rate, voice data and a check field; the frame header field indicates the beginning of the voice data frame, the data length indicates the total byte number of the data frame, the voice rate indicates the satellite voice coding rate value of the current transmission, the voice data is the voice data of the actual user, and the check field is the CRC check of all data from the beginning of the frame header to the end of the voice data.
3. The dual security voice service system according to claim 1, wherein the system comprises: the special voice gateway comprises a receiving channel and a transmitting channel; the receiving channel comprises a serial-parallel conversion module, a channel descrambling module, an E1 time slot separation module, a frame header searching module, a voice extraction module, a user security processing module and a satellite voice decoding module; the transmitting channel comprises a satellite voice coding module, a user safety processing module, a voice filling module, a framing module, an E1 time slot multiplexing module, a channel scrambling module and a parallel-serial conversion module;
a channel receiving processing process:
the serial-to-parallel conversion module is used for carrying out serial E1 data bit stream-to-byte conversion on the received voice data frames;
the channel descrambling module is used for descrambling the channel data of the data after the serial-parallel conversion;
the E1 time slot separation module is used for separating and extracting 32 time slot data in the E1 link from the descrambled data;
the frame header searching module is used for searching a voice data frame header in the separated and extracted data and positioning the position where the voice exists;
the voice extraction module is used for extracting voice data according to a specific frame format after the frame header search is finished, and performing redundant processing on repeated voice;
the user safety processing module is used for carrying out safety processing on the extracted voice data according to a user algorithm;
the satellite voice decoding module is used for converting the voice data after the security processing into standard PCM data according to a satellite standard and forwarding the standard PCM data to an internal telephone network through an E1 interface;
a channel processing process:
the satellite voice coding module is used for coding the PCM data of the internal telephone network according to a satellite standard;
the user security processing module is used for adding the encoded data into a user security algorithm;
the voice filling module is used for converting the voice data into voice data according to a specific frame format;
the framing module is used for adding voice data into a voice data frame header to perform framing;
the E1 time slot multiplexing module is used for multiplexing the voice data after framing with 32 time slot data in the E1 link;
the channel scrambling module is used for scrambling the multiplexed voice data;
the parallel-to-serial conversion module is used for converting the scrambled voice data into a serial E1 data bit stream.
4. A voice service method based on E1 private line and user algorithm double safety guarantee is characterized in that the method comprises the following processes:
communication flow from voice terminal to internal telephone network:
(1) the voice terminal completes the establishment of a service channel with a fixed telephone in an internal telephone network through a call establishment process;
(2) the voice terminal encodes the voice according to the satellite format, performs security processing on the encoded voice according to a user algorithm, and then forwards the encoded voice to a satellite gateway station through a satellite;
(3) the satellite gateway station transparently transmits the voice according to the number of the internal telephone network, and loads the voice to an E1 private line connected with a special voice gateway through a design frame format, and forwards the voice to the special voice gateway;
(4) the special voice gateway analyzes the data loaded on the E1, extracts the voice data, then carries out user algorithm reduction, completes the conversion from the voice to the standard PCM data according to the satellite standard, and forwards the data to the internal telephone network through an E1 interface;
(5) the internal telephone network forwards the PCM data to the fixed telephone in the network;
communication flow from the internal telephone network to the voice terminal:
(1) the fixed telephone and the voice terminal in the internal telephone network complete the establishment of a service channel through a call establishment process;
(2) the internal telephone network converts the voice of the fixed telephone in the network into PCM data and sends the PCM data to the special voice gateway through an E1 port;
(3) the special voice gateway receives PCM data from an E1 interface of an internal telephone network, codes according to a satellite standard, adds a user algorithm, and then loads the PCM data onto an E1 circuit connected with a satellite gateway station according to a designed frame format;
(4) the satellite gateway station receives E1 line data from the special voice gateway, obtains voice data of a corresponding terminal according to a designed frame format, transmits the voice data to a transmitting terminal and then sends the voice data to the satellite;
(5) the voice terminal receives the gateway station data forwarded through the satellite, performs security restoration on the voice according to a user algorithm, and then decodes the voice according to the satellite format to restore the voice.
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