CN110572531A - Facsimile system and method based on satellite mobile communication - Google Patents
Facsimile system and method based on satellite mobile communication Download PDFInfo
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- CN110572531A CN110572531A CN201910884491.3A CN201910884491A CN110572531A CN 110572531 A CN110572531 A CN 110572531A CN 201910884491 A CN201910884491 A CN 201910884491A CN 110572531 A CN110572531 A CN 110572531A
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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
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18567—Arrangements for providing additional services to the basic mobile satellite telephony service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/327—Initiating, continuing or ending a single-mode communication; Handshaking therefor
Abstract
the invention discloses a fax system and a method based on satellite mobile communication, wherein the fax system comprises a first fax machine, a satellite mobile terminal, a mobile communication satellite, a gateway station subsystem, a core network, a relay media gateway, a Public Switched Telephone Network (PSTN) and a second fax machine, and the fax method comprises the following steps: the data fax method between the two first fax machines and the data fax method between the first fax machine and the second fax machine can solve the problem of fax service application based on a satellite mobile communication network, solve the problem of interconnection and intercommunication between the satellite mobile communication network and the traditional PSTN network fax service, and realize the alternate transmission of voice service and fax service. In a word, the invention has the advantages of perfect system, high intelligence degree, convenient use and the like.
Description
Technical Field
The invention belongs to the technical field of satellite communication, and particularly relates to a facsimile system and method based on satellite mobile communication.
background
The wireless fax is an important extension and supplement of the traditional PSTN wired fax, provides a more convenient and rapid fax means for users, is widely applied to the fields of government offices, armies, armed police, public security, forest, grazing and fishing, mobile commerce and the like at present, and is used as an effective solution for fax service coverage in mountainous areas, lakes, offshore areas, remote areas and other areas.
The existing wireless fax service uses the circuit domain data transmission capability of the mobile communication network to realize the bearing of the G3 fax and the intercommunication with the PSTN network G3 fax. The method is limited by the support of chip and equipment manufacturers on fax functions, only GSM and CDMA2000 networks provide formal and commercial wireless fax services at present, and the problems of low success rate, insufficient coverage, geographical condition limitation, no support for alternation of voice and fax and the like exist in practical use.
the prior art is mostly only about the introduction of fax service related technologies of the terrestrial cellular mobile communication system, and has little description about fax service related technologies of the satellite mobile communication system. In addition, the prior art also mostly relates to the reduction of the transmission time of the wireless network fax service and the realization of the wireless fax service by the intelligent terminal calling the network service. The fax method based on satellite mobile communication provided by the invention mainly solves the problems of reliable transmission of fax signaling in a satellite mobile communication network, free switching between voice and fax services, error check of fax data blocks on a satellite wireless link, missing packet retransmission and the like. Therefore, the fax service application based on the satellite mobile communication network is realized, and the interconnection and intercommunication between the satellite mobile communication network and the traditional PSTN network fax service are realized.
disclosure of Invention
In view of the above problems, the present invention provides a facsimile system and method based on satellite mobile communication.
the technical scheme of the invention is as follows: a fax system based on satellite mobile communication mainly comprises a first fax machine, a plurality of satellite mobile terminals, a mobile communication satellite, gateway station subsystems, a core network, a relay media gateway, a PSTN and a second fax machine, wherein the first fax machines correspond to the same number of satellite mobile terminals respectively and are connected through cables, fax adapters are arranged in the satellite mobile terminals, the satellite mobile terminals are used for carrying out interaction of control signaling, fax service data packets and voice service data packets with the first fax machines through the fax adapters, the satellite mobile terminals and the gateway station subsystems are in wireless connection with the mobile communication satellite respectively, wireless links among the mobile communication satellite, the satellite mobile terminals and the gateway station subsystems provide wireless bearing channels for fax services, the core network is in wired connection with the gateway station subsystems, and the mobile communication satellite, the gateway station subsystems and the gateway station subsystems are in wired connection with one another, The gateway station subsystem, the core network and the wireless/wired link between the gateway station subsystem and the core network form a satellite mobile communication network, the core network triggers the gateway station subsystem to send a Radio Bearer Reconfiguration message by identifying a specific fax signaling, so as to realize the mutual switching between a voice channel and a fax service channel of the satellite mobile communication network, the PSTN is connected with the core network through the relay media gateway, the core network is internally provided with a fax service module, the fax service module realizes the conversion between the second fax machine and the PSTN through the relay media gateway, and the second fax machine is connected with the PSTN.
Furthermore, the system adds CRC check and fax block sequence number in the fax transmission data to realize the check and retransmission of the fax data block.
further, the fax adapter and the first fax machine conform to ITU-T t.30 communications procedures.
The method for performing data fax between two first fax machines by using the fax system based on satellite mobile communication specifically comprises the following steps:
the method comprises the following steps: the first Fax1 goes off the hook and dials;
Step two: after receiving the dial, the fax adapter Fa1 sends a dial instruction to the satellite mobile terminal a, and the satellite mobile terminal a initiates a voice call to the satellite mobile terminal B through the satellite mobile communication network;
step three: after receiving the voice call, the satellite mobile terminal B sends a ringing signal to a called first Fax2, Fax2 is off-hook and answers, the Fax adapter Fa2 sends an answering instruction to the satellite mobile terminal B, and the satellite mobile terminal B initiates a voice answer to the satellite mobile communication network, so that normal voice communication can be carried out between the two first Fax machines;
step four: pressing down a 'Fax start' button of a first Fax1 to send a CNG signal, converting the CNG signal into Fax signaling through a Fax adapter Fa1 and delivering the Fax signaling to a satellite mobile terminal A, the satellite mobile terminal A packaging the signaling into a non-access stratum (NAS) message and sending the message to a called satellite mobile terminal B through a satellite mobile communication network, the satellite mobile terminal B delivering the message to a Fax adapter Fa2, the Fax adapter Fa2 converting the Fax signaling into a Fax signal and sending the Fax signal to a first Fax2, the first Fax2 replying a CED signal, the Fax adapter Fa2 converting the Fax signaling into a Fax signaling and delivering the Fax signaling to a satellite mobile terminal B, the satellite mobile terminal B packaging the signaling into an NAS message and sending the NAS message to the satellite mobile communication network, when the satellite mobile communication network detects the CED signal, a gateway subsystem respectively sends Radio Bearer Reconfiguration signaling to the satellite mobile terminal A and the satellite mobile terminal B, and the satellite mobile terminal receives the signaling, and initiating channel switching, switching to a Fax service channel, replying a Radio Bearer Reconfiguration Complete signal to the gateway station subsystem (4), and establishing a Fax channel between the first Fax1 and the first Fax 2.
the method for performing data fax between the first fax machine and the second fax machine by using the fax system based on satellite mobile communication specifically comprises the following steps:
the method comprises the following steps: the first Fax1 goes off the hook and dials;
step two: after receiving the dial, the Fax adapter Fa1 sends a dial instruction to the satellite mobile terminal A, and the satellite mobile terminal A initiates a voice call to the second Fax machine Fax3 through the satellite mobile communication network and the PSTN;
Step three: the called second Fax machine Fax3 goes off hook to answer and initiates a voice answer to the satellite mobile communication network through the PSTN, and at the moment, the first Fax machine Fax1 and the second Fax machine Fax3 can carry out normal voice call;
Step four: pressing down a 'Fax start' button of a first Fax machine Fax1 to send a CNG signal, converting the CNG signal into Fax signaling through a Fax adapter Fa1 and delivering the Fax signaling to a satellite mobile terminal A, packaging the signaling into an NAS message and sending the NAS message to a second Fax machine Fax3 by the satellite mobile terminal A, replying a CED signal by the second Fax machine Fax3, when the CED signal is detected by a satellite mobile communication network, a gateway subsystem sends a Radio Bearer Reconfiguration signaling to the satellite mobile terminal A, after receiving the signaling, the satellite mobile terminal A initiates channel switching, switches to a Fax service channel, and returns the Radio Bearer Reconfiguration Complete signaling to the gateway subsystem, and establishes a Fax channel between the first Fax machine Fax1 and the second Fax machine Fax 3.
Further, after the Fax channel is established, the called first Fax2 and the second Fax3 send DIS messages to the calling first Fax1 to describe the standard capabilities of the called terminal, where the standard capabilities include page modulation rate, image resolution and whether the ECM mode is supported, and after receiving the DIS of the called terminal, the calling terminal replies a DCS message to the called terminal to notify the called terminal of performing Fax transmission using the parameters specified in the DCS.
Further, before data Fax is carried out, the calling first Fax1 and a corresponding Fax adapter carry out local training, after the training is successful, the called first Fax2 or the second Fax3 sends CFR to the calling first Fax1, the first Fax1 enters a Fax message stage after receiving the CFR, a CRC check sequence and a Fax block serial number are added in a defined Fax message frame structure, CRC check and Fax data block serial number check are carried out on a satellite mobile communication network and a called terminal, and check and retransmission of Fax data blocks are achieved.
further, after the calling Fax1 finishes sending the current page, if there are pages to be transmitted, the calling Fax1 sends an MPS message to the called Fax2 or the second Fax3, and the first Fax2 or the second Fax3 replies an MCF message and then continues to transmit Fax messages.
Further, after the Fax messages of the first Fax1 and Fax2 are ended, if the calling terminal and the called terminal are not on-hook, the calling first Fax1 sends DCN, after the satellite mobile communication network detects the DCN, the satellite mobile terminal a and the satellite mobile terminal B respectively issue Radio Bearer Reconfiguration signaling, after receiving the signaling, the satellite mobile terminal a and the satellite mobile terminal B initiate channel switching, switch to a voice channel, and reply to a gateway subsystem to a Radio Bearer Reconfiguration Complete signaling, at this time, the first Fax1 and Fax2 can perform voice communication.
Further, after the Fax messages of the first Fax1 and the second Fax3 are ended, if the calling terminal and the called terminal are not on-hook, the calling first Fax1 sends DCN, after the satellite mobile communication network detects the DCN, the satellite mobile terminal a issues a Radio Bearer Reconfiguration signaling, after receiving the signaling, the satellite mobile terminal a initiates channel switching to switch to a voice channel, and replies a Radio Bearer Reconfiguration complete signaling to the gateway subsystem, at this time, the first Fax1 and the second Fax3 can perform voice call.
Furthermore, if one end is on-hook in the fax process, the link is directly disconnected after the fax service is finished, and the voice channel is not switched back.
The invention has the beneficial effects that: the fax system and the method based on the satellite mobile communication can be widely applied to the satellite mobile communication system, the CRC check and the fax block serial number are added in fax transmission data to realize the check and the retransmission of a fax data block, fax signaling is encapsulated into a non-access layer command to ensure the problem of reliable transmission of the fax signaling in a communication network, meanwhile, a specific fax signaling is identified through the satellite mobile network, a channel mode is automatically switched according to the fax signaling, the automatic switching between voice and fax services can be realized, and an ITU-T.30 communication regulation is followed between a fax adapter and a first fax machine to realize the fax services based on the satellite mobile communication. In a word, the invention has the advantages of perfect system, high intelligence degree, convenient use and the like.
Drawings
FIG. 1 is a system block diagram of the present invention.
The system comprises a first fax machine 1, a satellite mobile terminal 2, a fax adapter 21, a gateway station subsystem 4, a core network 5, a relay media gateway 6, a PSTN7 and a second fax machine 8.
Detailed Description
For the convenience of understanding the technical solution of the present invention, the following description is made with reference to fig. 1 and the specific embodiments, which are not intended to limit the scope of the present invention.
Example 1: as shown in figure 1, a fax system based on satellite mobile communication mainly comprises a first fax machine 1, a plurality of satellite mobile terminals 2, a mobile communication satellite, a gateway station subsystem 4, a core network 5, a relay media gateway 6, a PSTN7 and a second fax machine 8, wherein the first fax machine 1 is provided with a plurality of fax adapters 21 which are respectively corresponding to the same number of satellite mobile terminals 2 and connected through cables, the satellite mobile terminals 2 are respectively provided with a fax adapter 21, the satellite mobile terminals 2 interact with the first fax machine 1 through the fax adapters 21, the fax adapters 21 and the first fax machine 1 follow ITU-T.30 communication regulations, the satellite mobile terminals 2 and the gateway station subsystem 4 are respectively in wireless connection with the mobile communication satellite, the mobile communication satellite and the satellite mobile terminals 2 thereof wirelessly connect with the mobile communication satellite mobile terminals 2, The wireless link between gateway station subsystems 4 provides a wireless bearing channel for fax services, the core network 5 is in wired connection with the gateway station subsystems 4, the mobile communication satellite, the gateway station subsystems 4, the core network 5 and the wireless/wired links between the core network and the gateway station subsystems form a satellite mobile communication network, the core network 5 triggers the gateway station subsystems 4 to send Radio Bearer Reconfiguration messages in a mode of identifying specific fax signaling, so that the mutual switching between a voice service channel and a fax service channel of the satellite mobile communication network is realized, the PSTN7 is connected with the core network 5 through a relay media gateway 6, a fax service module 51 is arranged in the core network 5, the fax service module 51 realizes the conversion between a data format and a transmission protocol of the PSTN7 through the relay media gateway 6, and the second fax machine 8 is connected with the PSTN 7.
example 2: with the facsimile system based on satellite mobile communication according to embodiment 1, performing data facsimile between two first facsimile machines 1 specifically includes the following steps:
The method comprises the following steps: the first Fax machine 1Fax1 goes off hook and dials;
Step two: fax adapter 21Fa1 sends a dial instruction to satellite mobile terminal 2A after receiving the dial, and satellite mobile terminal 2A initiates a voice call to satellite mobile terminal 2B through the satellite mobile communication network;
step three: after receiving the voice call, the satellite mobile terminal 2B sends a ringing signal to the called first Fax machine 1Fax2, Fax2 goes off hook to answer, the Fax adapter 21Fa2 sends an answering instruction to the satellite mobile terminal 2B, and the satellite mobile terminal 2B initiates a voice answer to the satellite mobile communication network, so that normal voice communication can be performed between the two first Fax machines 1;
Step four: pressing down a 'Fax start' button of a first Fax machine 1Fax1 to send a CNG signal, converting the CNG signal into Fax signaling to be handed over to a satellite mobile terminal 2A through a Fax adapter 21Fa1, the satellite mobile terminal 2A encapsulating the signaling into a non-access stratum (NAS) message, sending the message to a called satellite mobile terminal 2B through a satellite mobile communication network, the satellite mobile terminal 2B handing the message to a Fax adapter 21Fa2, the Fax adapter 21Fa2 converting the message into a Fax signal to be sent to the first Fax machine 1Fax2, the first Fax machine 1Fax2 replying a CED signal, converting the Fax signaling to be handed over to a satellite mobile terminal 2B through the Fax adapter 21Fa2, the satellite mobile terminal 2B encapsulating the signaling into an NAS message to be sent to the satellite mobile communication network, and when the satellite mobile communication network detects the CED signal, a gateway station subsystem 4 respectively sending radio beacon Reconfiguration signaling to the satellite mobile terminal 2A and the satellite mobile terminal 2B, after receiving the signaling, the satellite mobile terminal 2 initiates channel switching to switch to a Fax service channel, replies a Radio Bearer Reconfiguration Complete signaling to the gateway station subsystem 4, and establishes a Fax channel between the first Fax machine 1Fax1 and the first Fax machine 1Fax 2;
after the Fax channel is established, the called first Fax machine 1Fax2 sends DIS information to the calling first Fax machine 1Fax1 to describe the standard capability of the called terminal, wherein the standard capability comprises page modulation rate, image resolution and whether to support ECM mode, and after receiving DIS of the called terminal, the calling terminal replies DCS information to the called terminal to inform the called terminal to use designated parameters in DCS for Fax transmission;
before data Fax is carried out, the calling first Fax1 and the corresponding Fax adapter 21 carry out local training, after the training is successful, the called first Fax 1Fax2 sends CFR to the calling first Fax1, the first Fax 1Fax1 enters a Fax message stage after receiving the CFR, a CRC (cyclic redundancy check) sequence and a Fax block serial number are added in a defined Fax message frame structure, CRC check and Fax data block serial number check are carried out on the satellite mobile communication network 3 and the called terminal, and the check and the retransmission of the Fax data block are realized;
after the calling first Fax machine 1Fax1 finishes sending the current page, if the page needs to be transmitted, the calling first Fax machine 1Fax1 sends an MPS message to the called first Fax machine 1Fax2, the first Fax machine 1Fax2 replies the MCF message, and then Fax message transmission continues;
After the Fax message is finished, if the calling terminal and the called terminal are not on-hook, the calling first Fax machine 1Fax1 sends DCN, after the satellite mobile communication network detects the DCN, the satellite mobile terminal 2A and the satellite mobile terminal 2B respectively send a Radio Bearer Reconfiguration signaling, after receiving the signaling, the satellite mobile terminal 2A and the satellite mobile terminal 2B initiate channel switching, switch to a voice channel, reply a Radio Bearer Reconfiguration Complete signaling to a gateway station subsystem, and at this time, the first Fax machine 1Fax1 and the first Fax machine 1Fax2 can carry out voice communication;
if one end is on-hook in the fax process, the link is directly disconnected after the fax service is finished, and the voice channel is not switched back.
the fax business process is shown in table 1:
Table 1 facsimile service flow between first facsimile machines 1
and (4) surface note: in table 1, italics indicates the situation that the called terminal hangs up first in the voice call disconnection stage.
example 3: with the facsimile system based on satellite mobile communication according to embodiment 1, performing data facsimile between the first facsimile machine 1 and the second facsimile machine 8 specifically includes the following steps:
The method comprises the following steps: the first Fax machine 1Fax1 goes off hook and dials;
Step two: after receiving the dial, the Fax adapter Fa1 sends a dial instruction to the satellite mobile terminal 2A, and the satellite mobile terminal 2A initiates a voice call to the second Fax machine 8Fax3 through the satellite mobile communication network and the PSTN;
Step three: the called second Fax machine 8Fax3 goes off hook to answer and sends a voice answer to the satellite mobile communication network through the PSTN, and at the moment, the first Fax machine 1Fax1 and the second Fax machine 8Fax3 can carry out normal voice call;
step four: pressing down the 'Fax start' button of the first Fax1 to send out CNG signal, converting it into Fax signaling through the Fax adapter 21Fa1 to be handed over to the satellite mobile terminal 2A, the satellite mobile terminal 2A encapsulating the signaling into non-access layer signaling to be sent to the second Fax 8Fax3, the second Fax 8Fax3 replying CED signal, when the satellite mobile communication network detects CED signal, the gateway subsystem 4 sends Radio Bearer Reconfiguration signaling to the satellite mobile terminal 2A, after the satellite mobile terminal 2A receives the signaling, it initiates channel switching to Fax service channel, and replies Radio Bearer Reconfiguration Complete signaling to the gateway subsystem 4, to establish Fax channel between the first Fax 1Fax1 and the second Fax 8Fax 3.
After the Fax channel is established, the called second Fax machine 8Fax3 sends DIS information to the calling terminal first Fax machine 1Fax1 to describe the standard capability of the called terminal, the standard capability includes page modulation rate, image resolution and whether to support ECM mode, after receiving DIS of the called terminal, the calling party replies DCS information to the called terminal to inform the called terminal to use designated parameters in DCS to carry out Fax transmission;
before data Fax is carried out, the calling first Fax machine 1Fax1 carries out local training with a corresponding Fax adapter, after the training is successful, the called second Fax machine 8Fax3 sends CFR to the calling first Fax machine 1Fax1, the first Fax machine 1Fax1 enters a Fax message stage after receiving the CFR, a CRC (cyclic redundancy check) sequence and a Fax block serial number are added into a defined Fax message frame structure, CRC check and Fax data block serial number check are carried out on a satellite mobile communication network and a called terminal, and the check and the retransmission of a Fax data block are realized.
after the calling first Fax machine 1Fax1 finishes sending the current page, if there is any page to be transmitted, it sends MPS message to the called second Fax machine 8Fax3, and the second Fax machine 8Fax3 replies MCF message, and then continues to transmit Fax message.
After the Fax message is finished, if the calling terminal and the called terminal are not on-hook, the calling first Fax machine 1Fax1 sends a DCN, after the satellite mobile communication network detects the DCN, a Radio Bearer Reconfiguration signaling is issued to the satellite mobile terminal 2A, after the satellite mobile terminal 2A receives the signaling, channel switching is initiated, a voice channel is switched, a Radio Bearer Reconfiguration Complete signaling is replied to the gateway station subsystem, and at this time, the first Fax machine 1Fax1 and the second Fax machine 8Fax3 can carry out voice communication.
if one end is on-hook in the fax process, the link is directly disconnected after the fax service is finished, and the voice channel is not switched back.
The fax business process is shown in table 2:
TABLE 2 fax traffic flow between the first fax machine 1 and the second fax machine 8
And (4) surface note: in table 2, italics indicates the situation that the called terminal hangs up first in the voice call disconnection stage.
Claims (10)
1. A fax system based on satellite mobile communication is characterized by mainly comprising a first fax machine (1), a plurality of satellite mobile terminals (2), a mobile communication satellite (3), a gateway station subsystem (4), a core network (5), a relay media gateway (6), a PSTN (7) and a second fax machine (8), wherein the first fax machine (1) is provided with a plurality of fax adapters (21) which are respectively corresponding to the same number of satellite mobile terminals (2) and are connected through cables, the satellite mobile terminals (2) are respectively provided with the fax adapters (21), the satellite mobile terminals (2) are in interaction with the first fax machine (1) through the fax adapters (21) and are in control signaling, fax service data packets and voice service data packets, and the satellite mobile terminals (2) and the gateway station subsystem (4) are respectively in wireless connection with the mobile communication satellite (3), a mobile communication satellite (3) and a wireless link between the mobile communication satellite (3) and a satellite mobile terminal (2) and a gateway station subsystem (4) provide a wireless bearing channel for a fax service, a core network (5) is in wired connection with the gateway station subsystem (4), the mobile communication satellite (3), the gateway station subsystem (4), the core network (5) and a wireless/wired link between the mobile communication satellite and the gateway station subsystem form a satellite mobile communication network, the core network (5) triggers the gateway station subsystem (4) to send a Radio bearer reconfiguration message by identifying a specific fax signaling to realize the mutual switching between a voice service channel and a fax service channel of the satellite mobile communication network, the PSTN (7) is connected with the core network (5) through a relay media gateway (6), a fax service module is arranged in the core network (5), and the fax service module realizes the conversion between a data format and a transmission protocol with the PSTN (7) through the relay media gateway (6), the second fax machine (8) is connected to the PSTN (7).
2. The fax system based on satellite mobile communication according to claim 1, wherein the system adds CRC checksum fax block number in fax transmission data to realize checksum retransmission of fax data block.
3. A facsimile system based on satellite mobile communication according to claim 1, characterised in that the facsimile adapter (21) and the first facsimile machine (1) conform to ITU-T t.30 communications protocols.
4. The fax system based on satellite mobile communication according to claim 1, wherein the fax method of the data between the two first fax machines (1) comprises the following steps:
The method comprises the following steps: the Fax1 of the first Fax machine (1) of the calling party goes off the hook and dials;
Step two: after receiving the dialing, the fax adapter (21) Fa1 sends a dialing instruction to the calling satellite mobile terminal (2) A, and the satellite mobile terminal (2) A initiates a voice call to the called satellite mobile terminal (2) B through a satellite mobile communication network;
Step three: after receiving the voice call, the satellite mobile terminal (2) B sends a ringing signal to the called first Fax2 of the Fax machine (1), the Fax2 is off-hook and answers, the Fax adapter (21) Fa2 sends an answering instruction to the satellite mobile terminal (2) B, the satellite mobile terminal (2) B initiates a voice answer to the satellite mobile communication network, and at the moment, normal voice communication can be carried out between the two first Fax machines (1);
step four: pressing down the 'Fax start' button of the calling first Fax machine (1) Fax1 to send CNG signal, converting it into Fax signaling to be handed over to the satellite mobile terminal (2) A via the Fax adaptor (21) Fa1, the satellite mobile terminal (2) A encapsulating the signaling into non-access stratum (NAS) message, sending it to the satellite mobile terminal (2) B via the satellite mobile communication network, the satellite mobile terminal (2) B handing it over to the Fax adaptor (21) Fa2, the Fax adaptor (21) Fa2 converting it into Fax signal to be sent to the first Fax machine (1) Fax2, the first Fax machine (1) Fax2 replying CED signal, converting it into Fax signaling to be handed over to the satellite mobile terminal (2) B via the Fax adaptor (21) Fa2, then the satellite mobile terminal (2) B encapsulating the signaling into NAS message to be sent to the satellite mobile communication network, when the satellite mobile communication network detects the CED signal, the gateway station subsystem (4) respectively issues Radio Bearer Reconfiguration signaling to the satellite mobile terminal (2) A and the satellite mobile terminal (2) B, after receiving the signaling, the satellite mobile terminal (2) A and the satellite mobile terminal (2) B initiate channel switching, switch to a Fax service channel, reply to the Radio Bearer Reconfiguration Complete signaling to the gateway station subsystem (4), and establish a Fax channel between the first Fax machine (1) Fax1 and the first Fax machine (1) Fax 2.
5. The fax system according to claim 1, wherein the fax method for the data between the first fax machine (1) and the second fax machine (8) comprises the following steps:
the method comprises the following steps: the Fax1 of the first Fax machine (1) of the calling party goes off the hook and dials;
Step two: the Fax adapter (21) Fa1 sends a dialing instruction to the satellite mobile terminal (2) A, and the satellite mobile terminal (2) A initiates a voice call to the second Fax machine (8) Fax3 through the satellite mobile communication network and the PSTN;
Step three: the called second Fax machine (8) Fax3 goes off hook to answer and initiates a voice answer to the satellite mobile communication network through the PSTN, and at the moment, the first Fax machine (1) Fax1 and the second Fax machine (8) Fax3 can carry out normal voice conversation;
Step four: the CNG signal is sent by pressing a 'Fax start' button of a first Fax machine (1) Fax1, the CNG signal is converted into Fax signaling through a Fax adapter (21) Fa1 and is handed over to a satellite mobile terminal (2) A, the satellite mobile terminal (2) A encapsulates the signaling into NAS information and sends the NAS information to a second Fax machine (8) Fax3, the second Fax machine (8) Fax3 replies a CED signal, after the CED signal is detected by a satellite mobile communication network, a gateway station subsystem (4) sends Radio Bearer Reconfiguration signaling to the satellite mobile terminal (2) A, and after the satellite mobile terminal (2) A receives the signaling, the channel switching is initiated, the channel switching is switched to a Fax service channel, and a Radio Bearer Reconfiguration Complete signaling is replied to the gateway station subsystem (4), so that a Fax channel between the first Fax machine (1) Fax1 and the second Fax machine (8) Fax3 is established.
6. The Fax method of the Fax system based on satellite mobile communication according to any one of claims 4 or 5, wherein after the Fax channel is established, the called first Fax machine (1) Fax2 and the second Fax machine (8) Fax3 send DIS messages to the calling first Fax machine (1) Fax1 to describe the standard capabilities of the called terminal, wherein the standard capabilities comprise page modulation rate, image resolution and whether ECM mode is supported, and after receiving DIS of the called terminal, the calling terminal replies DCS messages to the called terminal to inform the called terminal of Fax transmission by using parameters specified in DCS.
7. the Fax method of the Fax system based on the satellite mobile communication according to any one of claims 4 or 5, wherein before data Fax, the calling first Fax machine (1) Fax1 performs local training with the corresponding Fax adapter (21), after the training is successful, the called first Fax machine (1) Fax2 or the second Fax machine (8) Fax3 sends a CFR to the calling first Fax machine (1) Fax1, after the CFR is received by the first Fax machine (1) Fax1, the Fax message stage is entered, a CRC check sequence and a Fax block serial number are added in a defined Fax message frame structure, and the CRC and Fax data block serial number check are performed on the satellite mobile communication network and the called terminal, so as to realize the check and retransmission of the Fax data block.
8. the Fax method for a Fax system based on satellite mobile communication according to any one of claims 4 or 5, wherein after the calling first Fax machine (1) Fax1 sends the current page, if there are more pages to be transmitted, it sends an MPS message to the called first Fax machine (1) Fax2 or the second Fax machine (8) Fax3, and the first Fax machine (1) Fax2 or the second Fax machine (8) Fax3 replies to the MCF message and then continues to transmit the Fax message.
9. the Fax method for the Fax system based on the satellite mobile communication according to claim 4, wherein after the Fax message is ended, if neither the calling terminal nor the called terminal is on-hook, the calling first Fax1 sends DCN, after the satellite mobile communication network detects DCN, it issues Radio Bearer Reconfiguration signaling to the satellite mobile terminal (2) a and the satellite mobile terminal (2) B, respectively, after the satellite mobile terminal (2) a and the satellite mobile terminal (2) B receive the signaling, it initiates channel switching, switches to the voice channel, and replies a Radio Bearer Reconfiguration complete signaling to the gateway subsystem (4), at which time the first Fax1 and the first Fax2 can perform voice call.
10. The Fax method for the Fax system based on the satellite mobile communication according to claim 5, wherein after the Fax message is ended, if neither the calling terminal nor the called terminal is on-hook, the calling first Fax machine (1) Fax1 sends DCN, after the satellite mobile communication network detects DCN, it issues Radio Bearer Reconfiguration signaling to the satellite mobile terminal (2) a, after the satellite mobile terminal (2) a receives the signaling, it initiates channel switching, switches to the voice channel, and replies a Radio Bearer Reconfiguration Complete signaling to the gateway station subsystem (4), at which time the first Fax machine (1) Fax1 and the second Fax machine (8) Fax3 can perform voice call.
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