Method for automatically establishing communication link of service zero-waiting instant messaging between satellite terminals

Abstract

The invention provides a method for automatically establishing a communication link of service zero-waiting instant messaging between satellite terminals. The method comprises the following steps of: S1, formulating a task strategy; s2, distributing a task strategy; and S3, establishing a mapping relation between an information protection equipment management identifier ID and a satellite terminal channel unit ID based on a task strategy, and completing automatic establishment of a communication link through detection judgment triggering. Task strategies are formulated and distributed according to task guarantee requirements, a communication link is automatically established before the task starts, the task guarantee efficiency is improved, the task guarantee timeliness is enhanced, and zero-waiting instant communication of services after the task starts is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a method for automatically establishing a communication link for zero-wait instant communication between satellite terminals. Background Art

[0002] Satellite communication systems have been widely used by users in special industries. By supporting special equipment such as management equipment, distribution equipment, and information protection equipment, a satellite communication network for special user mission assurance is built. The satellite terminals at different terminal nodes in the private network are matched with information protection equipment to realize business information transmission protection.

[0003] Business interoperability is based on the communication links between satellite terminals, and the establishment of communication links is mainly achieved through manual operation in the manner of "communication equipment initiates, special equipment follows". This method is single, with low guarantee efficiency and poor timeliness, making it difficult to meet the large-scale mission guarantee requirements of users in special industries. Currently, there is no application of special equipment that can autonomously trigger the automatic establishment of communication links.

[0004] When users in special industries are performing mission assurance, business terminals and satellite terminals are usually deployed separately and used by different operators. Since the business terminal operators are far away from the satellite terminals, they generally do not have the real-time status of the establishment of the communication link between satellite terminals. Therefore, they dare not initiate business intercommunication rashly. Usually, they can only initiate it after manually confirming that the link is established. Otherwise, business information will be lost, making it difficult to ensure zero-wait instant communication for the business. Summary of the invention

[0005] In view of the above-mentioned problems, the present invention provides a method for automatically establishing a communication link for zero-wait instant communication between satellite terminals, which can improve the efficiency of mission assurance, enhance the timeliness of mission assurance, and automatically establish a communication link before the mission starts, thereby meeting the needs of zero-wait instant communication and large-scale mission assurance after the mission starts.

[0006] The present invention provides a method for automatically establishing a communication link for zero-wait instant communication between satellite terminals, comprising the following steps:

[0007] Step S1, formulate task strategy;

[0008] Step S2, distributing task strategies;

[0009] Step S3, establishing a mapping relationship between the information protection device management identification ID and the satellite terminal channel unit ID based on the task strategy, and completing the automatic establishment of the communication link through detection and judgment triggering.

[0010] In some embodiments, in step S1, formulating the task strategy includes: editing and generating the task strategy on the management device according to task requirements.

[0011] In some embodiments, the task strategy includes the following strategy elements:

[0012] Strategy ID: that is, the strategy number. One communication link corresponds to one strategy number.

[0013] The policy elements of each communication link include the information protection device management identification ID, the task time limit range, the latest time to establish the communication link, the communication link establishment time offset, the latest network access time, and the length of time the distribution device waits for the link to be established after autonomously sending a link establishment notification message.

[0014] In some embodiments, in step S2, the distribution task strategy supports two distribution modes: offline distribution and online distribution, with online distribution being the main mode.

[0015] In some embodiments, when offline distribution is adopted, task strategy distribution is performed through an injector configured by the system.

[0016] In some embodiments, when online distribution is adopted, the management device initiates it autonomously, first pushing the task policy online to the distribution device, and then the distribution device distributes it online to the information protection device to which the policy belongs when the information protection device is connected to the network.

[0017] In some embodiments, step S3 includes the following sub-steps:

[0018] Step S3-100, establishing a mapping relationship between the information protection device management identification ID and the satellite terminal channel unit ID, and forming a link establishment notification message forwarding satellite terminal channel unit ID addressing table;

[0019] Step S3-200, automatically sending a link establishment notification message based on the task strategy;

[0020] Step S3-300, automatically sending a link establishment application message based on the task strategy to trigger the communication link establishment process.

[0021] In some embodiments, step S3-100 includes the following sub-steps:

[0022] Step S3-101, the satellite terminal and the information protection device are turned on and a handshake between the software is completed;

[0023] Step S3-102, the satellite terminal configures the satellite terminal channel unit ID to the information protection device;

[0024] Step S3-103, the satellite terminal sends a network access notification message to the information protection device;

[0025] Step S3-104, the information protection device constructs a network access authentication application message for the distribution device, wherein the network access authentication application message carries the information protection device management identification ID and the satellite terminal channel unit ID;

[0026] Step S3-105, the information protection device sends a network access authentication application message to the satellite terminal;

[0027] Step S3-106, the satellite terminal sends a network access application message to the satellite network control, wherein the network access application message carries network access authentication application information;

[0028] Step S3-107, the satellite network control forwards the network access authentication application message to the distribution device;

[0029] Step S3-108, the distribution device receives the network access authentication application message, extracts the information protection device management identification ID and the satellite terminal channel unit ID, establishes a mapping relationship between the information protection device management identification ID and the satellite terminal channel unit ID, and forms a link establishment notification message forwarding satellite terminal channel unit ID addressing table.

[0030] In some embodiments, step S3-200 includes the following sub-steps:

[0031] Step S3-201, calculate the link establishment time t=T2-T δ ; Where T2 is the latest time for establishing the communication link, T δ Establishing a time offset for a communication link;

[0032] Step S3-202, obtaining the current time;

[0033] Step S3-203, determine whether the current time is less than t, if it is less than t, return to step S3-202; otherwise, execute step S3-204;

[0034] Step S3-204, determining whether all the intercommunication parties specified in the task strategy have joined the network, if not, continue to execute step S3-204; otherwise, execute step S3-205;

[0035] Step S3-205, turn off the timer, clear the link establishment notification message sending timeout flag, set the link establishment notification message not sent flag, and set the link not established flag;

[0036] Step S3-206, obtain the current time and determine whether it is less than the task end time T E , if it is less than T E , then execute step S3-207; otherwise, exit the process;

[0037] Step S3-207, obtaining link establishment status;

[0038] Step S3-208, judging whether the link has been established according to the acquired link establishment status, if not established, executing step S3-209; otherwise, executing step S3-212;

[0039] Step S3-209, determine whether the link establishment notification message has been sent, if not, execute step S3-210; otherwise, execute step S3-211;

[0040] Step S3-210, constructing a link establishment notification message, wherein the link establishment notification message carries a policy ID, a link opposite end information protection device management identifier ID, and an opposite end satellite terminal channel unit ID; sending the link establishment notification message to the information protection device of one party of the link through an online management channel identified by the satellite terminal channel unit ID; clearing the link establishment notification message unsent identifier; setting the timing period to T3, and starting the timer; returning to step S3-207;

[0041] Step S3-211, determine whether the link establishment notification message has timed out, if not, return to step S3-206; otherwise, return to step S3-205;

[0042] Step S3-212, turn off the timer and clear the timeout flag for sending the link establishment notification message;

[0043] Step S3-213, exit the process.

[0044] In some embodiments, step S3-300 includes the following sub-steps:

[0045] Step S3-301, extracting the policy ID, the link peer information protection device management identification ID, and the peer satellite terminal channel unit ID from the link establishment notification message;

[0046] Step S3-302, according to the policy ID, retrieve the task policy stored locally;

[0047] Step S3-303, determine whether the policy retrieval is successful, if successful, execute step S3-304; otherwise, end the process;

[0048] Step S3-304, extracting the locally stored peer information protection device management identification ID according to the policy ID, and comparing it with the received peer information protection device management identification ID;

[0049] Step S3-305, determining whether the peer information protection device management identification ID comparison is successful, if successful, executing step S3-306; otherwise, ending the process;

[0050] Step S3-306, obtaining link establishment status;

[0051] Step S3-307, judging whether the link has been established according to the acquired link establishment status, if not established, executing step S3-308; otherwise, ending the process;

[0052] Step S3-308, constructing a link establishment application message, wherein the link establishment application message carries the channel unit ID of the opposite satellite terminal, and sending the link establishment application message to the matching satellite terminal, and the satellite terminal initiates a communication link establishment process with the opposite satellite terminal based on the channel unit ID of the opposite satellite terminal;

[0053] Step S3-309, end the process.

[0054] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0055] 1. The present invention formulates and distributes task strategies according to task guarantee requirements, automatically establishes communication links before the task starts, improves task guarantee efficiency, enhances task guarantee timeliness, and ensures zero-wait instant messaging after the task starts.

[0056] 2. The present invention is suitable for special users to use a dedicated satellite communication network to implement mission assurance. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 A schematic diagram of the architecture of a satellite communication system applied in an embodiment of the present invention.

[0058] Figure 2 The present invention is a flowchart of a method for automatically establishing a communication link for zero-wait instant communication between satellite terminals proposed by an embodiment of the present invention.

[0059] Figure 3 Schematic diagram of time-related strategy elements in a task strategy according to an embodiment of the present invention.

[0060] Figure 4 The figure is a schematic diagram of the process of establishing a communication link between satellite terminals in an embodiment of the present invention.

[0061] Figure 5 This is a flow chart of automatically sending a link establishment notification message based on a task strategy in an embodiment of the present invention.

[0062] Figure 6 This is a flow chart of automatically sending a link establishment application message based on a task strategy in an embodiment of the present invention. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0064] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0065] Figure 1 The schematic diagram of the architecture of the satellite communication system applied in the embodiment of the present invention is that the management device is connected to the control and management center to respectively control the terminal node A and the terminal node B. The control and management center includes distribution equipment, satellite network control and central station channel equipment, and the terminal node A and the terminal node B are both composed of satellite terminals and information protection equipment.

[0066] Figure 2 The flowchart of a method for automatically establishing a communication link for zero-wait instant communication between satellite terminals proposed in an embodiment of the present invention. The method for automatically establishing a communication link for zero-wait instant communication between satellite terminals comprises the following steps:

[0067] Step S1, formulate task strategy;

[0068] Step S2, distributing task strategies;

[0069] Step S3, establishing a mapping relationship between the information protection device management identification ID and the satellite terminal channel unit ID based on the task strategy, and completing the automatic establishment of the communication link through detection and judgment triggering.

[0070] In some embodiments, for step S1, the formulation of the task strategy includes: editing and generating the task strategy on the management device according to the task requirements, and the task strategy can usually be formulated manually.

[0071] In some embodiments, the mission strategy mainly includes the following strategy elements:

[0072] Policy ID: That is, the policy number, which is the number of the policy element set. One communication link corresponds to one policy number. The policy elements of each communication link include the management identification ID of the information protection device, the task time limit range, the latest establishment time of the communication link, the offset of the communication link establishment time, the latest network access time, the duration for waiting for the link establishment after the distribution device independently sends the link establishment notification message, etc. As Figure 3 shown.

[0073] Management identification ID of the information protection device: The unique management identifications of the information protection device A and the information protection device B at both ends of the communication link are respectively denoted as ID A , and ID B .

[0074] Task time limit range: The task start time T S and the task end time T E , T S < T E .

[0075] Latest establishment time of the communication link: T2, T2 < T s .

[0076] Offset of the communication link establishment time: T δ , in seconds, randomly generated by the management device within the time range of T (the policy executed by the management device), T δ < T; the link establishment time t = T2 - T δ .

[0077] Latest network access time: T1, T1 ≤ T2 - T. (Note: The information protection devices on both sides of the communication link need to complete network access before this latest network access time).

[0078] Duration T3 for waiting for the link establishment after the distribution device independently sends the link establishment notification message, in seconds.

[0079] In some embodiments, for step S2, the distribution task policy supports two distribution methods: offline distribution and online distribution, with online distribution being the main one. Among them:

[0080] When offline distribution is adopted, the task policy is distributed through the injector configured by the system, generally implemented in a manual manner.

[0081] When online distribution is adopted, it is initiated independently by the management device. First, the task policy is pushed online to the distribution device, and then the distribution device distributes it online to the information protection devices to which the policy belongs during the network access stage of the information protection devices.

[0082] In some embodiments, for step S3, the working principle of automatic establishment of the communication link is, through real-time automatic monitoring of the network access status of the information protection device, when the information protection devices of the intercommunication parties have successfully accessed the network, the distribution device automatically sends a link establishment notification message to an information protection device of the intercommunication party, and then the information protection device automatically sends a link establishment application message to the matching satellite terminal to trigger the automatic establishment process of the communication link between the satellite terminals; the establishment status of the communication link is monitored in real time by the distribution device, and if the link is not established within the timeout period, the link establishment notification message will be resent until the communication link is successfully established.

[0083] The distribution device implements online management of the information protection device based on the information protection device management identification ID, including the sending of link establishment notification messages. The online management messages need to be carried and forwarded through the satellite network control; the satellite network control can forward the online management messages to the managed information protection device through the satellite channel based on the satellite terminal channel unit ID; however, in the actual use of special users, the allocation relationship between the information protection device and the satellite terminal is not fixed, and there is no fixed mapping relationship between the information protection device management identification ID and the satellite terminal channel unit ID. This mapping needs to be achieved through certain technical means to achieve the correct forwarding of online management messages.

[0084] Therefore, the present invention also needs to solve the following problems:

[0085] (1) During the integrated network access of the satellite terminal and the information protection device, the distribution device automatically binds the information protection device management identification ID with the satellite terminal channel unit ID, thereby solving the satellite terminal channel unit addressing problem required for sending a link establishment notification message to the information protection device.

[0086] (2) Based on the policy, the distribution device realizes real-time automatic monitoring of the network access status and communication link establishment status of the information protection device, solves the problem of the timing of automatic sending of the link establishment notification message, and solves the problem of the successful execution of the link establishment notification message.

[0087] (3) The information protection device implements the legitimacy detection of the link establishment notification message based on the policy, thereby solving the problem of automatic sending of the link establishment application message.

[0088] In view of this, if Figure 4 As shown, step S3 specifically includes the following sub-steps:

[0089] Step S3-100, establishing a mapping relationship between the information protection device management identification ID and the satellite terminal channel unit ID, and forming a link establishment notification message forwarding satellite terminal channel unit ID addressing table.

[0090] The satellite terminal and information protection device of the same terminal node complete the power-on and network access process before the latest network access time T1 specified by the mission strategy. In this process, the distribution device obtains the information protection device management identification ID and the satellite terminal channel unit ID, and establishes a mapping relationship between the information protection device management identification ID and the satellite terminal channel unit ID, forming a link establishment notification message forwarding satellite terminal channel unit ID addressing table. Execute in the following order:

[0091] Step S3-101, the satellite terminal and the information protection device are turned on and a handshake between the software is completed;

[0092] Step S3-102, the satellite terminal configures the satellite terminal channel unit ID to the information protection device;

[0093] Step S3-103, the satellite terminal sends a network access notification message to the information protection device;

[0094] Step S3-104, the information protection device constructs a network access authentication application message for the distribution device, wherein the network access authentication application message carries the information protection device management identification ID and the satellite terminal channel unit ID;

[0095] Step S3-105, the information protection device sends a network access authentication application message to the satellite terminal;

[0096] Step S3-106, the satellite terminal sends a network access application message to the satellite network control, wherein the network access application message carries network access authentication application information;

[0097] Step S3-107, the satellite network control forwards the network access authentication application message to the distribution device;

[0098] Step S3-108, the distribution device receives the network access authentication application message, extracts the information protection device management identification ID and the satellite terminal channel unit ID, establishes a mapping relationship between the information protection device management identification ID and the satellite terminal channel unit ID, and forms a link establishment notification message forwarding satellite terminal channel unit ID addressing table.

[0099] Step S3-200: automatically sending a link establishment notification message based on the task strategy.

[0100] After receiving the task strategy, the distribution device performs time detection and judgment based on the task strategy, and E Within the range, send a link establishment notification message to the information protection device and wait for the link to be established. If the link is not established within the time limit, resend the notification until the link is established. Figure 5 As shown, the specific process is executed in the following order:

[0101] Step S3-201, calculate the link establishment time t=T2-Tδ ;

[0102] Step S3-202, obtaining the current time;

[0103] Step S3-203, determine whether the current time is less than t, if it is less than t, return to step S3-202; otherwise, execute step S3-204;

[0104] Step S3-204, determining whether all the intercommunication parties specified in the task strategy have joined the network, if not, continue to execute step S3-204; otherwise, execute step S3-205;

[0105] Step S3-205, turn off the timer, clear the link establishment notification message sending timeout flag, set the link establishment notification message not sent flag, and set the link not established flag;

[0106] Step S3-206, obtain the current time and determine whether it is less than T E , if it is less than T E , then execute step S3-207; otherwise, exit the process;

[0107] Step S3-207, obtaining link establishment status;

[0108] Step S3-208, judging whether the link has been established according to the acquired link establishment status, if not established, executing step S3-209; otherwise, executing step S3-212;

[0109] Step S3-209, determine whether the link establishment notification message has been sent, if not, execute step S3-210; otherwise, execute step S3-211;

[0110] Step S3-210, constructing a link establishment notification message, wherein the link establishment notification message carries a policy ID, a link opposite end information protection device management identifier ID, and an opposite end satellite terminal channel unit ID; sending the link establishment notification message to the information protection device of one party of the link through an online management channel identified by the satellite terminal channel unit ID; clearing the link establishment notification message unsent identifier; setting the timing period to T3, and starting the timer; returning to step S3-207;

[0111] Step S3-211, determine whether the link establishment notification message has timed out, if not, return to step S3-206; otherwise, return to step S3-205;

[0112] Step S3-212, turn off the timer and clear the timeout flag for sending the link establishment notification message;

[0113] Step S3-213, exit the process.

[0114] Step S3-300, automatically sending a link establishment application message based on the task strategy to trigger the communication link establishment process.

[0115] After receiving the link establishment notification message, the information protection device extracts the policy ID, the link peer information protection device management identification ID, and the peer satellite terminal channel unit ID. After successfully matching the locally stored task policy, it automatically initiates a link establishment application to the local satellite terminal, triggering the communication link establishment process between satellite terminals. Figure 6 As shown, the specific process is executed in the following order:

[0116] Step S3-301, extracting the policy ID, the link peer information protection device management identification ID, and the peer satellite terminal channel unit ID from the link establishment notification message;

[0117] Step S3-302, according to the policy ID, retrieve the task policy stored locally;

[0118] Step S3-303, determine whether the policy retrieval is successful, if successful, execute step S3-304; otherwise, end the process;

[0119] Step S3-304, extracting the locally stored peer information protection device management identification ID according to the policy ID, and comparing it with the received peer information protection device management identification ID;

[0120] Step S3-305, determining whether the peer information protection device management identification ID comparison is successful, if successful, executing step S3-306; otherwise, ending the process;

[0121] Step S3-306, obtaining link establishment status;

[0122] Step S3-307, judging whether the link has been established according to the acquired link establishment status, if not established, executing step S3-308; otherwise, ending the process;

[0123] Step S3-308, constructing a link establishment application message, wherein the link establishment application message carries the channel unit ID of the opposite satellite terminal, and sending the link establishment application message to the matching satellite terminal, and the satellite terminal initiates a communication link establishment process with the opposite satellite terminal based on the channel unit ID of the opposite satellite terminal;

[0124] Step S3-309, end the process.

[0125] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for automatically establishing a communication link for zero-wait instant communication between satellite terminals, characterized in that: The steps include: Step S1, formulate task strategy; Step S2, distributing task strategies; Step S3, establishing a mapping relationship between the information protection device management identification ID and the satellite terminal channel unit ID based on the task strategy, and completing the automatic establishment of the communication link through detection and judgment triggering.

2. The method for automatically establishing a communication link for zero-wait instant communication between satellite terminals according to claim 1, characterized in that: In step S1, the formulation of the task strategy includes: editing and generating the task strategy on the management device according to the task requirements.

3. The method for automatically establishing a communication link for zero-wait instant communication between satellite terminals according to claim 1, characterized in that: The mission strategy includes the following strategic elements: Strategy ID: that is, the strategy number. One communication link corresponds to one strategy number. The policy elements of each communication link include the information protection device management identification ID, the task time limit range, the latest time to establish the communication link, the communication link establishment time offset, the latest network access time, and the length of time the distribution device waits for the link to be established after autonomously sending a link establishment notification message.

4. The method for automatically establishing a communication link for zero-wait instant communication between satellite terminals according to claim 1, characterized in that: In step S2, the distribution task strategy supports two distribution modes: offline distribution and online distribution, with online distribution being the main mode.

5. The method for automatically establishing a communication link for zero-wait instant communication between satellite terminals according to claim 4, characterized in that: When offline distribution is adopted, task strategies are distributed through the injector configured by the system.

6. The method for automatically establishing a communication link for zero-wait instant communication between satellite terminals according to claim 4, characterized in that: When online distribution is adopted, the management device initiates it autonomously, first pushing the task policy online to the distribution device, and then the distribution device distributes it online to the information protection device to which the policy belongs when the information protection device is connected to the network.

7. The method for automatically establishing a communication link for zero-wait instant communication between satellite terminals according to claim 1, characterized in that: Step S3 includes the following sub-steps: Step S3-100, establishing a mapping relationship between the information protection device management identification ID and the satellite terminal channel unit ID, and forming a link establishment notification message forwarding satellite terminal channel unit ID addressing table; Step S3-200, automatically sending a link establishment notification message based on the task strategy; Step S3-300, automatically sending a link establishment application message based on the task strategy to trigger the communication link establishment process.

8. The method for automatically establishing a communication link for zero-wait instant communication between satellite terminals according to claim 7, characterized in that: Step S3-100 includes the following sub-steps: Step S3-101, the satellite terminal and the information protection device are turned on and a handshake between the software is completed; Step S3-102, the satellite terminal configures the satellite terminal channel unit ID to the information protection device; Step S3-103, the satellite terminal sends a network access notification message to the information protection device; Step S3-104, the information protection device constructs a network access authentication application message for the distribution device, wherein the network access authentication application message carries the information protection device management identification ID and the satellite terminal channel unit ID; Step S3-105, the information protection device sends a network access authentication application message to the satellite terminal; Step S3-106, the satellite terminal sends a network access application message to the satellite network control, wherein the network access application message carries network access authentication application information; Step S3-107, the satellite network control forwards the network access authentication application message to the distribution device; Step S3-108, the distribution device receives the network access authentication application message, extracts the information protection device management identification ID and the satellite terminal channel unit ID, establishes a mapping relationship between the information protection device management identification ID and the satellite terminal channel unit ID, and forms a link establishment notification message forwarding satellite terminal channel unit ID addressing table.

9. The method for automatically establishing a communication link for zero-wait instant communication between satellite terminals according to claim 7, characterized in that: Step S3-200 includes the following sub-steps: Step S3-201, calculate the link establishment time t=T2-T δ ; Where T2 is the latest time for establishing the communication link, T δ Establishing a time offset for a communication link; Step S3-202, obtaining the current time; Step S3-203, determine whether the current time is less than t, if it is less than t, return to step S3-202; otherwise, execute step S3-204; Step S3-204, determining whether all the intercommunication parties specified in the task strategy have joined the network, if not, continue to execute step S3-204; otherwise, execute step S3-205; Step S3-205, turn off the timer, clear the link establishment notification message sending timeout flag, set the link establishment notification message not sent flag, and set the link not established flag; Step S3-206, obtain the current time and determine whether it is less than the task end time T E , if it is less than T E , then execute step S3-207; otherwise, exit the process; Step S3-207, obtaining link establishment status; Step S3-208, judging whether the link has been established according to the acquired link establishment status, if not established, executing step S3-209; otherwise, executing step S3-212; Step S3-209, determine whether the link establishment notification message has been sent, if not, execute step S3-210; otherwise, execute step S3-211; Step S3-210, constructing a link establishment notification message, wherein the link establishment notification message carries a policy ID, a link opposite end information protection device management identifier ID, and an opposite end satellite terminal channel unit ID; sending the link establishment notification message to the information protection device of one party of the link through an online management channel identified by the satellite terminal channel unit ID; clearing the link establishment notification message unsent identifier; setting the timing period to T3, and starting the timer; returning to step S3-207; Step S3-211, determine whether the link establishment notification message has timed out, if not, return to step S3-206; otherwise, return to step S3-205; Step S3-212, turn off the timer and clear the timeout flag for sending the link establishment notification message; Step S3-213, exit the process.

10. The method for automatically establishing a communication link for zero-wait instant communication between satellite terminals according to claim 7, characterized in that: Step S3-300 includes the following sub-steps: Step S3-301, extracting the policy ID, the link peer information protection device management identification ID, and the peer satellite terminal channel unit ID from the link establishment notification message; Step S3-302, according to the policy ID, retrieve the task policy stored locally; Step S3-303, determine whether the policy retrieval is successful, if successful, execute step S3-304; otherwise, end the process; Step S3-304, extracting the locally stored peer information protection device management identification ID according to the policy ID, and comparing it with the received peer information protection device management identification ID; Step S3-305, determining whether the peer information protection device management identification ID comparison is successful, if successful, executing step S3-306; otherwise, ending the process; Step S3-306, obtaining link establishment status; Step S3-307, judging whether the link has been established according to the acquired link establishment status, if not established, executing step S3-308; otherwise, ending the process; Step S3-308, constructing a link establishment application message, wherein the link establishment application message carries the channel unit ID of the opposite satellite terminal, and sending the link establishment application message to the matching satellite terminal, and the satellite terminal initiates a communication link establishment process with the opposite satellite terminal based on the channel unit ID of the opposite satellite terminal; Step S3-309, end the process.

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