CN114095613B - Voice service system and method based on E1 private line and user algorithm security guarantee - Google Patents
Voice service system and method based on E1 private line and user algorithm security guarantee Download PDFInfo
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- CN114095613B CN114095613B CN202111334123.5A CN202111334123A CN114095613B CN 114095613 B CN114095613 B CN 114095613B CN 202111334123 A CN202111334123 A CN 202111334123A CN 114095613 B CN114095613 B CN 114095613B
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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
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Abstract
The invention discloses a voice service system and a method based on E1 private line and user algorithm security 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 special line, and the internal telephone network is connected with the special voice gateway through an E1 interface. The method comprises E1 special line voice bearing and special voice gateway processing design, and communication flow between the user specific voice terminal and the internal telephone network. The invention does not change satellite system standards, system equipment and normal operation, is convenient to implement, and has better maintainability and operability; the E1 private line is adopted to isolate other users, the safety protection of the users is increased, and the safety and reliability of the voice service of the users are ensured to a greater extent; the number of E1 dedicated 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 space satellite mobile communication system aiming at the voice security requirement of users, belonging to the technical field of satellite mobile communication.
Background
The "Tiantong one number" satellite mobile communication system is the first generation of autonomous controllable high orbit satellite mobile communication system in China, and can provide voice, short message and low-speed data service. The mobile communication system of the Tiantong satellite is used as a national strategic communication infrastructure, and plays an important role in communication guarantee as a first reactor of emergency communication in the fields of emergency, government, industry application and the like.
However, since the radio signal can be captured in the satellite mobile communication process, and the digital signal is obtained after various subsequent processes, the security and confidentiality of the user service are challenged, and therefore, in certain specific fields, the security assurance of the satellite mobile system is insufficient only, 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, it is urgently needed to design a scheme and a system capable of adding a user security algorithm on the basis of not changing the operation of the system so as to meet the voice security requirements of users in specific industries.
Disclosure of Invention
Aiming at the security requirement of the user voice service of the space satellite mobile communication system, the invention provides a voice service scheme and a voice service system based on double security guarantee 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 dual security guarantee comprises a voice terminal, a satellite gateway station, a special voice gateway and an internal telephone network; the voice terminal realizes air interface information interaction with a satellite gateway station through a satellite, the satellite gateway station is connected with a special voice gateway through an E1 private line, and an internal telephone network is connected with the special voice gateway through an E1 interface;
the voice terminal is used for carrying out security processing on user voice data during transmission, encoding the voice data according to a satellite communication protocol, and forwarding the encoded voice data to a satellite gateway station through a satellite; the system is also used for decoding the received satellite gateway station voice data forwarded by the satellite during receiving, and then carrying out security processing to restore user voice;
The satellite gateway station is used for transmitting voice according to the number of the internal telephone network, carrying the voice transmitted by the voice terminal to an E1 private line through a designed frame format, and forwarding the voice to a special voice gateway; the voice receiving module is also used for receiving voice from the special voice gateway through the E1 private line, then restoring the voice according to a specific frame format and forwarding the voice to a corresponding user specific terminal;
The special voice gateway is used for analyzing the data carried on the special line from the satellite gateway station E1 to obtain voice data, carrying out user security algorithm restoration, then carrying out decoding processing according to satellite standards to convert the voice data into PCM data, and forwarding the PCM data to the 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 satellite standards, adding a user security algorithm, carrying on an E1 dedicated line and transmitting 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 landline telephone within the network and then forwarding the PCM data to a dedicated voice gateway.
Wherein the design frame format includes a frame header, a data length, a voice rate, voice data, and a check field; the frame header field indicates the beginning of a frame of voice data, the data length indicates the total byte number of the frame of data, the voice rate indicates the satellite voice encoding rate value of the current transmission, the voice data is the actual user voice data, and the check field is the CRC check of all the data from the beginning of the frame header to the end of the voice data.
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 head 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;
and (3) a channel collection treatment process:
The serial-parallel conversion module is used for converting the received voice data frame into a serial E1 data bit stream and a byte;
the channel descrambling module is used for carrying out descrambling processing on the channel data on the data after serial-parallel conversion;
the E1 time slot separation module is used for separating and extracting 32 time slot data in an E1 link for the data subjected to descrambling;
the frame head searching module is used for searching a voice data frame head in the separated and extracted data and positioning the existence position of voice;
The voice extraction module is used for extracting voice data according to a specific frame format after the frame head search is completed, and performing redundant processing of repeated voices;
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 satellite standards and forwarding the standard PCM data to an internal telephone network through an E1 interface;
The processing process of the hair channel comprises the following steps:
The satellite voice coding module is used for coding PCM data of the internal telephone network according to satellite standards;
the user safety processing module is used for adding the coded data into a user safety 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 the voice data frame head to carry out framing;
the E1 time slot multiplexing module is used for multiplexing 32 time slot data in an E1 link with the voice data after framing;
the channel scrambling module is used for scrambling the multiplexed voice data;
the parallel-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 dual security guarantee includes the following steps:
communication flow between voice terminal and 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 voice to a satellite gateway station through a satellite;
(3) The satellite gateway station carries out transparent transmission on the voice according to the internal telephone network number, and carries the voice on an E1 private line connected with the special voice gateway through a designed frame format and forwards the voice to the special voice gateway;
(4) The special voice gateway analyzes the data carried on E1, extracts voice data, then carries out user algorithm restoration, completes conversion from voice to standard PCM data according to satellite standards, and forwards the voice to an 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 between the internal telephone network and the voice terminal:
(1) The fixed telephone and voice terminal in the internal telephone network complete the establishment of service channel through the 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 the internal telephone network, codes according to satellite standards, adds a user algorithm, and then loads the PCM data onto an E1 line 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 end and then transmits the voice data to a satellite;
(5) The voice terminal receives gateway station data forwarded by the satellite, performs security restoration on the voice according to a user algorithm, and then decodes the voice according to a satellite format to restore the voice.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention is based on the standard satellite mobile communication system flow, does not change the system standard, system equipment and normal business operation process, is convenient to implement, and has better maintainability and operability;
2. the invention adopts E1 special line to bear and adds a layer of user safety protection, thereby strengthening the safety of user service in a multi-level way on the basis of the original system;
3. the invention can expand the number of users by increasing the number of E1 special lines, can configure different fixed number segments, and can communicate 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 frame format composition diagram of an embodiment of the present invention;
FIG. 3 is a flow chart of business process of an embodiment of the present 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 dual security guarantee comprises a voice terminal, a satellite gateway station, a special voice gateway and an internal telephone network; as shown in fig. 1 and fig. 4, the voice terminal realizes air interface information interaction with a satellite gateway station through a satellite, the satellite gateway station is connected with a special voice gateway through an E1 private line, and an internal telephone network is connected with the special 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 the voice forwarding of the user specific terminal in the system, and is different from the voice processing mode of the universal terminal, the voice of the user specific voice terminal does not perform the mutual conversion between satellite coding voice and standard PCM coding voice, but directly carries on an E1 private line through a specific format, and forwards to a rear-end private voice gateway device for processing; the voice receiving module is also used for receiving voice from the special voice gateway through the E1 private line, then restoring the voice according to a specific frame format and forwarding the voice to a corresponding user specific terminal;
the special voice gateway is used for receiving the data of the satellite gateway station through an E1 special line, carrying out bearing matching between satellite voice data frames and standard E1 data frames according to a design format, analyzing to obtain satellite voice data, executing a user security algorithm, then carrying out encoding and decoding processing according to a satellite standard to convert the 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 satellite standards, adding a user security algorithm, carrying on an E1 dedicated line and transmitting to a satellite gateway station;
The internal telephone network is used for realizing intercommunication between the fixed telephone in the network and the special voice gateway.
Example 2:
The voice service system based on the dual security guarantee of the E1 private line and the user algorithm is used for the first technical scheme, and the E1 private line voice bearing and special voice gateway processing design:
The data length carried by each 60ms in the standard E1 protocol is 480 bytes, and the maximum data of each 60ms in three-rate voice of the space-time satellite is only 30 bytes, so that the carrying matching is required according to a certain transmission format in the transmission process.
As shown in fig. 2, the data frame of the specific format designed by the present invention includes a frame header, a data length, a voice rate, voice data, and a check. The frame header field indicates the beginning of a frame of voice data, the data length indicates the total byte number of the frame of data, the voice rate indicates the satellite voice encoding rate value of the current transmission, the voice data is the actual user voice data, and the check field is the CRC check of all the 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 the E1 channel, the rest is filled with zeros, and meanwhile, in order to ensure burst resistance errors of channel transmission, scrambling processing is carried out on the data in the channel transmission process.
As shown in fig. 3, the dedicated voice gateway receives E1 private line data and then sequentially performs the following processes:
and (3) a channel collection treatment process:
The serial-parallel conversion module is used for converting the received voice data frame into a serial E1 data bit stream and a byte;
the channel descrambling module is used for carrying out descrambling processing on the channel data on the data after serial-parallel conversion;
the E1 time slot separation module is used for separating and extracting 32 time slot data in an E1 link for the data subjected to descrambling;
the frame head searching module is used for searching a voice data frame head in the separated and extracted data and positioning the existence position of voice;
The voice extraction module is used for extracting voice data according to a specific frame format after the frame head search is completed, and performing redundant processing of repeated voices;
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 satellite standards and forwarding the standard PCM data to an internal telephone network through an E1 interface;
The processing process of the hair channel comprises the following steps:
The satellite voice coding module is used for coding PCM data of the internal telephone network according to satellite standards;
the user safety processing module is used for adding the coded data into a user safety 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 the voice data frame head to carry out framing;
the E1 time slot multiplexing module is used for multiplexing 32 time slot data in an E1 link with the voice data after framing;
the channel scrambling module is used for scrambling the multiplexed voice data;
the parallel-serial conversion module is used for converting the scrambled voice data into a serial E1 data bit stream.
Example 3:
the first technical scheme is that the voice service method based on E1 private line and user algorithm double security guarantee is used for the communication flow between the user specific voice terminal and the internal telephone network:
communication flow between voice terminal and 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 voice to a satellite gateway station through a satellite;
(3) The satellite gateway station carries out transparent transmission on the voice according to the internal telephone network number, and carries the voice on an E1 private line connected with the special voice gateway through a designed frame format and forwards the voice to the special voice gateway;
(4) The special voice gateway analyzes the data carried on E1, extracts voice data, then carries out user algorithm restoration, completes conversion from voice to standard PCM data according to satellite standards, and forwards the voice to an 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 between the internal telephone network and the voice terminal:
(1) The fixed telephone and voice terminal in the internal telephone network complete the establishment of service channel through the 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 the internal telephone network, codes according to satellite standards, adds a user algorithm, and then loads the PCM data onto an E1 line 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 end and then transmits the voice data to a satellite;
(5) The voice terminal receives gateway station data forwarded by the satellite, performs security restoration on the voice according to a user algorithm, and then decodes the voice according to a satellite format to restore the voice.
The special voice gateway equipment opens the custom security algorithm processing to the user and has confidentiality of the algorithm, so the equipment adopts a modularized and multi-layer architecture, custom interfaces among modules isolate the general processing part and the user processing part from the hardware, so that each module can be independently developed and tested, and the equipment is integrated to complete the whole function.
Claims (4)
1. A voice service system based on E1 private line and user algorithm double security 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 air interface information interaction with a satellite gateway station through a satellite, the satellite gateway station is connected with a special voice gateway through an E1 private line, and an internal telephone network is connected with the special voice gateway through an E1 interface;
the voice terminal is used for carrying out security processing on user voice data during transmission, encoding the voice data according to a satellite communication protocol, and forwarding the encoded voice data to a satellite gateway station through a satellite; the system is also used for decoding the received satellite gateway station voice data forwarded by the satellite during receiving, and then carrying out security processing to restore user voice;
The satellite gateway station is used for transmitting voice according to the number of the internal telephone network, carrying the voice transmitted by the voice terminal to an E1 private line through a designed frame format, and forwarding the voice to a special voice gateway; the voice receiving module is also used for receiving voice from the special voice gateway through the E1 private line, then restoring the voice according to a specific frame format and forwarding the voice to a corresponding user specific terminal;
The special voice gateway is used for analyzing the data carried on the special line from the satellite gateway station E1 to obtain voice data, carrying out user security algorithm restoration, then carrying out decoding processing according to satellite standards to convert the voice data into PCM data, and forwarding the PCM data to the 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 satellite standards, adding a user security algorithm, carrying on an E1 dedicated line and transmitting 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 landline telephone within the network and then forwarding the PCM data to a dedicated voice gateway.
2. The voice service system based on E1 private line and user algorithm dual security guarantee according to claim 1, wherein: the design frame format includes a frame header, a data length, a voice rate, voice data, and a check field; the frame header field indicates the beginning of a frame of voice data, the data length indicates the total byte number of the frame of data, the voice rate indicates the satellite voice encoding rate value of the current transmission, the voice data is the actual user voice data, and the check field is the CRC check of all the data from the beginning of the frame header to the end of the voice data.
3. The voice service system based on E1 private line and user algorithm dual security guarantee according to claim 1, wherein: 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 head 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;
and (3) a channel collection treatment process:
The serial-parallel conversion module is used for converting the received voice data frame into a serial E1 data bit stream and a byte;
the channel descrambling module is used for carrying out descrambling processing on the channel data on the data after serial-parallel conversion;
the E1 time slot separation module is used for separating and extracting 32 time slot data in an E1 link for the data subjected to descrambling;
the frame head searching module is used for searching a voice data frame head in the separated and extracted data and positioning the existence position of voice;
The voice extraction module is used for extracting voice data according to a specific frame format after the frame head search is completed, and performing redundant processing of repeated voices;
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 satellite standards and forwarding the standard PCM data to an internal telephone network through an E1 interface;
The processing process of the hair channel comprises the following steps:
The satellite voice coding module is used for coding PCM data of the internal telephone network according to satellite standards;
the user safety processing module is used for adding the coded data into a user safety 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 the voice data frame head to carry out framing;
the E1 time slot multiplexing module is used for multiplexing 32 time slot data in an E1 link with the voice data after framing;
the channel scrambling module is used for scrambling the multiplexed voice data;
the parallel-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 security guarantee is characterized by comprising the following steps:
communication flow between voice terminal and 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 voice to a satellite gateway station through a satellite;
(3) The satellite gateway station carries out transparent transmission on the voice according to the internal telephone network number, and carries the voice on an E1 private line connected with the special voice gateway through a designed frame format and forwards the voice to the special voice gateway;
(4) The special voice gateway analyzes the data carried on E1, extracts voice data, then carries out user algorithm restoration, completes conversion from voice to standard PCM data according to satellite standards, and forwards the voice to an 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 between the internal telephone network and the voice terminal:
(1) The fixed telephone and voice terminal in the internal telephone network complete the establishment of service channel through the 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 the internal telephone network, codes according to satellite standards, adds a user algorithm, and then loads the PCM data onto an E1 line 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 end and then transmits the voice data to a satellite;
(5) The voice terminal receives gateway station data forwarded by the satellite, performs security restoration on the voice according to a user algorithm, and then decodes the voice according to a satellite format to restore the voice.
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