Emergency satellite call method and satellite communication system

Abstract

The present disclosure provides an emergency satellite call method and a satellite communication system. The method comprises: a core network receiving an initial direct-transfer message sent by a calling terminal via a satellite base station, the initial direct-transfer message comprising a call management service request message of a non-access stratum; on the basis of the call management service request message, determining whether a current call service satisfies a preset condition for entering an emergency service mode, wherein in the emergency service mode, the core network does not perform authentication processing on the calling terminal and a called terminal during a call bearer establishment process; and if the current call service satisfies the preset condition, in the emergency service mode, establishing a first call bearer with the calling terminal, establishing a second call bearer with the called terminal, and completing a call between the calling terminal and the called terminal by means of the first call bearer and the second call bearer.

Description

Emergency satellite call method and satellite communication system

[0001] Cross-reference to Related Applications

[0002] The present disclosure claims priority from a Chinese patent application No. 202410726301.6 filed on June 5, 2024, and entitled "Emergency satellite call method and satellite communication system", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of satellite communication, in particular, to an emergency satellite call method and a satellite communication system. BACKGROUND

[0004] In a call service, when a user dials an emergency telephone number, the terminal initiates an emergency call establishment process, at this time, the call management service type carried in the call management service request message of the NAS (Non-Access Stratum) is "0010", which represents an emergency call establishment; the NAS sends an emergency call establishment message which is more simplified and carries less information instead of an ordinary call establishment message; after the core network receives the call request, it no longer initiates an authentication process.

[0005] Although the above-mentioned emergency call process is simplified, it is only applicable to the scenario where the user terminal dials an emergency telephone number, and does not include the scenario where the user terminal dials an ordinary number. The network side will initiate authentication for the calling terminal and the called terminal in the ordinary call process, and cannot actively take a simplified process similar to the emergency call for the ordinary call initiated by the user terminal.

[0006] In some emergency scenarios, such as natural disasters such as earthquakes, floods, and mudslides in a certain area, which cause the ground network to be unavailable, satellite network disaster relief is needed, and the timeliness requirement for communication is much higher than other requirements. However, the air interface resource of satellite communication is limited in itself, and the air interface transmission delay is large, and the above-mentioned ordinary call process further increases the delay of the satellite communication call establishment process, and reduces the reliability of satellite communication in the emergency scenario.

[0007] At present, there is no effective solution to the above-mentioned problems. SUMMARY

[0008] The present disclosure provides an emergency satellite call method and a satellite communication system to at least solve the technical problem that the conventional call establishment process in satellite communication is long in time delay, occupies a large amount of resources, and is not suitable for emergency call scenarios.

[0009] According to an aspect of the embodiments of the present disclosure, an emergency satellite call method applied to a core network is provided, including: receiving a first initial direct transmission message sent by a first satellite base station from a calling terminal, wherein the first initial direct transmission message includes a non-access layer call management service request message; determining whether a current call service meets preset conditions for entering an emergency service mode according to the call management service request message, wherein the core network does not perform authentication processing on the calling terminal and a called terminal in a call bearer establishment process in the emergency service mode; and if the current call service meets the preset conditions, establishing a first call bearer with the calling terminal through the first satellite base station and a second call bearer with the called terminal through a second satellite base station in the emergency service mode, and completing a call between the calling terminal and the called terminal through the first call bearer and the second call bearer.

[0010] Optionally, before receiving the first initial direct transmission message sent by the first satellite base station from the calling terminal, a first notification message is broadcasted to a plurality of terminals in a target area through a third satellite base station in the target area, wherein the first notification message is used to instruct the plurality of terminals to enter the emergency service mode, and each terminal includes a non-access layer call management service request message and a call establishment message in an initial direct transmission message sent to the core network through the third satellite base station in the emergency service mode as the calling terminal.

[0011] Optionally, the preset conditions include that a mobile user identifier corresponding to the calling terminal is located in a preset whitelist, and the calling terminal meets at least one of the following conditions: a current location of the calling terminal is located in the target area, a type of the calling terminal is a target terminal type, a user priority and / or a service priority corresponding to the calling terminal are higher than a preset priority threshold, and the calling terminal has completed authentication in a preset historical time period.

[0012] Optionally, the first call bearer is established with the calling terminal through the first satellite base station, including: sending a security mode command message to the calling terminal through the first satellite base station; receiving a security mode complete message fed back by the calling terminal through the first satellite base station; receiving a first uplink direct transmission message sent by the calling terminal through the first satellite base station, wherein the first uplink direct transmission message includes a non-access layer call establishment message; feeding back a first downlink direct transmission message to the calling terminal through the first satellite base station, wherein the first downlink direct transmission message includes a call control layer call in progress message; sending a radio access bearer allocation request message to the first satellite base station, wherein the first satellite base station is configured to send a radio bearer establishment message to the calling terminal and receive a radio bearer establishment complete message fed back by the calling terminal; and receiving a radio access bearer allocation response message fed back by the first satellite base station.

[0013] Optionally, the first initial direct transfer message sent by the calling terminal further comprises a non-access layer call setup message, and the first call bearer is established between the calling terminal and the first satellite base station, comprising: sending a security mode command message to the calling terminal through the first satellite base station; receiving a security mode complete message fed back by the calling terminal through the first satellite base station; in response to the received and buffered non-access layer call setup message, feeding back a first downlink direct transfer message to the calling terminal through the first satellite base station, wherein the first downlink direct transfer message comprises a call control layer call in progress message; sending a radio access bearer allocation request message to the first satellite base station, wherein the first satellite base station is configured to send a radio bearer setup message to the calling terminal and receive a radio bearer setup complete message fed back by the calling terminal; and receiving a radio access bearer allocation response message fed back by the first satellite base station.

[0014] Optionally, the second call bearer is established between the called terminal and the second satellite base station, comprising: sending a paging message to the called terminal through the second satellite base station; receiving a second initial direct transfer message sent by the called terminal through the second satellite base station, wherein the second initial direct transfer message comprises a non-access layer paging response message; sending a security mode command message to the called terminal through the second satellite base station; receiving a security mode complete message fed back by the called terminal through the second satellite base station; sending a second downlink direct transfer message to the called terminal through the second satellite base station, wherein the second downlink direct transfer message comprises a call control layer call setup message; receiving a second uplink direct transfer message fed back by the called terminal through the second satellite base station, wherein the second uplink direct transfer message comprises a non-access layer call confirmation message; sending a radio access bearer allocation request message to the second satellite base station, wherein the second satellite base station is configured to send a radio bearer setup message to the called terminal and receive a radio bearer setup complete message fed back by the called terminal; and receiving a radio access bearer allocation response message fed back by the second satellite base station.

[0015] Optionally, in the emergency service mode, all non-access layer messages are encrypted according to a target encryption mode, wherein the target encryption mode comprises one of the following: no encryption, encryption using an empty encryption algorithm, encryption using a preset encryption algorithm, and encryption using a key generated by the last authentication of the calling terminal.

[0016] Optionally, the second notification message is broadcast to a plurality of terminals in the target area through the third satellite base station, wherein the second notification message is used to instruct the plurality of terminals to exit the emergency service mode.

[0017] According to another aspect of the embodiments of the present disclosure, an emergency satellite call method applied to a calling terminal is also provided, including: entering an emergency service mode in response to a first notification message broadcast by a first satellite base station through a core network, wherein the first notification message is used to instruct all terminals in a target area to enter the emergency service mode; sending a first initial direct transmission message to the core network through the first satellite base station in the emergency service mode, wherein the first initial direct transmission message includes a non-access layer call management service request message and a call setup message; establishing a first call bearer with the core network, wherein the core network is configured to establish a second call bearer with a called terminal, and the core network does not perform authentication processing on the calling terminal and the called terminal in a call bearer establishment process in the emergency service mode; and performing a call with the called terminal through the first call bearer, the core network and the second call bearer.

[0018] According to another aspect of the embodiments of the present disclosure, a satellite communication system is also provided, including: a calling terminal, a first satellite base station, a core network, a second satellite base station and a called terminal, wherein the core network is configured to receive a first initial direct transmission message sent by the calling terminal through the first satellite base station, wherein the first initial direct transmission message includes a non-access layer call management service request message; determining whether a current call service meets preset conditions for entering an emergency service mode according to the call management service request message, wherein the core network does not perform authentication processing on the calling terminal and the called terminal in a call bearer establishment process in the emergency service mode; and if the current call service meets the preset conditions, establishing a first call bearer with the calling terminal through the first satellite base station, establishing a second call bearer with the called terminal through the second satellite base station, and completing a call between the calling terminal and the called terminal through the first call bearer and the second call bearer in the emergency service mode.

[0019] Optionally, the satellite communication system further includes: a third satellite base station and a plurality of terminals located in the target area, wherein the core network is further configured to broadcast a first notification message to the plurality of terminals through the third satellite base station, wherein the first notification message is used to instruct the plurality of terminals to enter the emergency service mode, and each terminal includes a non-access layer call management service request message and a call setup message in an initial direct transmission message sent to the core network through the third satellite base station in the emergency service mode.

[0020] According to another aspect of the embodiments of the present disclosure, a computer program product is also provided, including: a computer program, wherein the computer program is executed by a processor to implement the above-mentioned emergency satellite call method.

[0021] In some embodiments of the present disclosure, an electronic device is provided. The electronic device includes a memory and a processor. The memory stores a computer program. The processor is configured to execute the emergency satellite call method described above by the computer program.

[0022] In some embodiments of the present disclosure, the core network first receives an initial direct transmission message sent by the calling terminal through the first satellite base station. The initial direct transmission message includes a non-access layer call management service request message. Then, the core network determines whether the current call service meets the preset condition for entering the emergency service mode according to the call management service request message. In the emergency service mode, the core network does not perform authentication processing on the calling terminal and the called terminal in the call bearer establishment process. If the current call service meets the preset condition, the core network establishes a first call bearer with the calling terminal through the first satellite base station and establishes a second call bearer with the called terminal through the second satellite base station in the emergency service mode, and completes the call between the calling terminal and the called terminal through the first call bearer and the second call bearer. The core network can determine the service scenario of the current call service through the call management service request message transmitted by the calling terminal and automatically enter the emergency service mode. By reducing the authentication process, the processing logic can be simplified, the air interface resource occupation can be reduced, and the delay of the call establishment process can be reduced. The technical problem that the conventional call establishment process in satellite communication is long, occupies a large amount of resources, and is not suitable for emergency call scenarios is effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which are included to provide a further understanding of the present disclosure and constitute a part of the present disclosure, illustrate certain illustrative embodiments of the present disclosure and are used to explain the present disclosure, but do not limit the present disclosure. In the drawings:

[0024] FIG. 1 is a structural schematic diagram of an optional satellite communication system according to an embodiment of the present disclosure;

[0025] FIG. 2 is a signaling interaction schematic diagram of an optional call bearer establishment between a calling terminal and a core network according to an embodiment of the present disclosure;

[0026] FIG. 3 is a signaling interaction schematic diagram of an optional call bearer establishment between a called terminal and a core network according to an embodiment of the present disclosure;

[0027] FIG. 4 is a signaling interaction schematic diagram of another optional call bearer establishment between a calling terminal and a core network according to an embodiment of the present disclosure;

[0028] FIG. 5 is a signaling interaction schematic diagram of an optional ringing and answering stage according to an embodiment of the present disclosure;

[0029] FIG. 6 is a flow schematic diagram of an optional emergency satellite call method according to an embodiment of the present disclosure;

[0030] FIG. 7 is a flow diagram of another optional emergency satellite call method according to an embodiment of the present disclosure;

[0031] FIG. 8 is a structural diagram of an optional emergency satellite call device according to an embodiment of the present disclosure;

[0032] FIG. 9 is a structural diagram of another optional emergency satellite call device according to an embodiment of the present disclosure;

[0033] FIG. 10 is a structural diagram of an optional computer terminal according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0034] In order to make the person skilled in the art better understand the present disclosure scheme, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, not all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present disclosure.

[0035] It should be noted that the terms "first", "second" and the like in the specification and claims of the present disclosure and the drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] Embodiment 1

[0037] According to the embodiments of the present disclosure, first, a satellite communication system is provided, as shown in FIG. 1, which at least includes: a calling terminal 11, a first satellite base station 12, a core network 13, a second satellite base station 14 and a called terminal 15. The core network 13 is configured to receive a first initial direct transmission message sent by the calling terminal 11 through the first satellite base station 12, and the first initial direct transmission message includes a non-access layer call management service request message. The core network 13 determines whether the current call service meets the preset condition for entering the emergency service mode according to the call management service request message. In the emergency service mode, the core network 12 does not perform authentication processing on the calling terminal 11 and the called terminal 15 in the call bearer establishment process. If the current call service meets the preset condition, the core network 13 establishes a first call bearer with the calling terminal 11 through the first satellite base station 12 and establishes a second call bearer with the called terminal 15 through the second satellite base station 14 in the emergency service mode, and completes the call between the calling terminal 11 and the called terminal 15 through the first call bearer and the second call bearer.

[0038] In the system, the core network can determine the service scene of the current call service through the request message transmitted by the calling terminal and automatically enter the emergency service mode. In the emergency service mode, the authentication process is reduced, the processing logic is simplified, the air interface resource occupation is reduced, and the delay of the call establishment process is reduced, thereby improving the applicability of satellite communication in the emergency service scene.

[0039] The functions and interactions of the modules in the satellite communication system will be described in detail in combination with the specific implementation process.

[0040] In some embodiments of the present disclosure, in the call establishment process, the calling terminal needs to first establish an RRC (Radio Resource Control) connection with the first satellite base station, and then send a first initial direct transmission message to the core network through the first satellite base station. The first initial direct transmission message includes a non-access layer call management service request message, and the call management service request message usually includes the following contents: 1) request type, indicating service request, tracking area update request or extended service request; 2) service type, indicating voice, data or other services; 3) mobile identity, including the IMSI (International Mobile Subscriber Identity) or TMSI (Temporary Mobile Subscriber Identity) of the user; 4) TLLI (Temporary Logical Link Identity), used to identify the logical connection between the terminal and the network; 5) additional information, such as emergency call indication or user location information, etc.

[0041] In some embodiments of the present disclosure, the core network can determine whether the current call service meets the preset condition for entering the emergency service mode according to the call management service request message, wherein the preset condition can be set as follows: the mobile user identifier corresponding to the calling terminal is located in the preset whitelist, and the calling terminal meets at least one of the following conditions: the current location of the calling terminal is located in the target area, the type of the calling terminal is the target terminal type, the user priority and / or service priority corresponding to the calling terminal is higher than the preset priority threshold, and the calling terminal has completed authentication within a preset historical time period.

[0042] Understandably, the mobile user identifier can be IMSI or TMSI, and the safety in the satellite communication process can be ensured by pre-setting the whitelist of the terminal that can enter the emergency service mode and performing whitelist verification; the target area can be an area where an emergency event occurs, such as a disaster relief emergency area, and the target terminal type can be a disaster relief emergency special terminal device or a terminal device specially customized by certain departments and units, and the specific business scenario can be judged by detecting the location and type of the terminal; judging the user priority or service priority is also applicable to the use demand scenario of certain special departments and units; and in some scenarios, the calling terminal can have just completed authentication within a preset historical time period, such as 10 minutes, and in order to save air interface resources, the calling terminal can also enter the emergency service mode without authentication.

[0043] In some embodiments of the present disclosure, when the core network establishes the first call bearer with the calling terminal through the first satellite base station, the core network can perform the following operations: sending a security mode command message to the calling terminal through the first satellite base station; receiving a security mode complete message fed back by the calling terminal through the first satellite base station; receiving a first uplink direct transmission message sent by the calling terminal through the first satellite base station, wherein the first uplink direct transmission message includes a non-access layer call establishment message; feeding back a first downlink direct transmission message to the calling terminal through the first satellite base station, wherein the first downlink direct transmission message includes a call control layer call in progress message; sending a radio access bearer allocation request message to the first satellite base station, wherein the first satellite base station is configured to send a radio bearer establishment message to the calling terminal and receive a radio bearer establishment complete message fed back by the calling terminal; and receiving a radio access bearer allocation response message fed back by the first satellite base station.

[0044] FIG. 2 shows a signaling flowchart of a complete first call bearer establishment process, which specifically includes the following steps:

[0045] S1, the calling terminal sends an RRC connection request message (RRC Connection Request) to the first satellite base station;

[0046] S2, the first satellite base station sends an RRC connection setup message (RRC Connection Setup) carrying the wireless link parameters to the calling terminal;

[0047] S3, the calling terminal establishes a dedicated signaling connection according to the wireless link parameters, and sends an RRC connection setup complete message (RRC Connection Setup Complete) to the first satellite base station;

[0048] S4, the calling terminal sends a first initial direct transfer message (Initial Direct Transfer) carrying a call management service request message (CM Service Request) of a non-access layer to the first satellite base station;

[0049] S5, the first satellite base station establishes an Iu connection, and sends an initial UE message (Initial UE Message) carrying the call management service request message (CM Service Request) to the core network;

[0050] S6, the core network initiates a security mode control process, and sends a security mode command message (Security Mode Command) to the first satellite base station;

[0051] S7, the first satellite base station sends the security mode command message (Security Mode Command) to the calling terminal;

[0052] S8, the calling terminal sends a security mode complete message (Security Mode Complete) to the first satellite base station;

[0053] S9, the first satellite base station sends the security mode complete message (Security Mode Complete) to the core network, and completes the security mode control process;

[0054] S10, the calling terminal sends a first uplink direct transfer message (Uplink Direct Transfer) carrying a call setup message (Setup) of a non-access layer to the first satellite base station;

[0055] S11, the first satellite base station sends a direct transfer message (Direct Transfer) carrying the call setup message (Setup) to the core network;

[0056] S12, the core network sends a direct transfer message (Direct Transfer) carrying a call proceeding message (Call Proceeding) of a call control layer (CC) to the first satellite base station;

[0057] S13, the first satellite base station sends a first downlink direct transfer message (Downlink Direct Transfer) carrying a call proceeding message (Call Proceeding) to the calling terminal;

[0058] S14, the core network initiates a radio access bearer (RAB) assignment process and sends a radio access bearer allocation request message (RAB Assignment Request) to the first satellite base station;

[0059] S15, the first satellite base station sends a radio bearer setup message (RB (Radio Bearer) Setup) to the calling terminal;

[0060] S16, the calling terminal sends a radio bearer setup complete message (RB Setup Complete) to the first satellite base station;

[0061] S17, the first satellite base station sends a radio access bearer allocation response message (RAB Assignment Response) to the core network, completing the RAB assignment process.

[0062] In some embodiments of the present disclosure, after the core network finds the beam in which the called terminal resides in response to the call request of the calling terminal, the second call bearer can be established between the second satellite base station and the called terminal by the following methods: sending a paging message to the called terminal through the second satellite base station; receiving a second initial direct transfer message sent by the called terminal through the second satellite base station, wherein the second initial direct transfer message includes a non-access layer paging response message; sending a security mode command message to the called terminal through the second satellite base station; receiving a security mode complete message fed back by the called terminal through the second satellite base station; sending a second downlink direct transfer message to the called terminal through the second satellite base station, wherein the second downlink direct transfer message includes a call control layer call setup message; receiving a second uplink direct transfer message fed back by the called terminal through the second satellite base station, wherein the second uplink direct transfer message includes a non-access layer call confirmation message; sending a radio access bearer allocation request message to the second satellite base station, wherein the second satellite base station is configured to send a radio bearer setup message to the called terminal and receive a radio bearer setup complete message fed back by the called terminal; receiving a radio access bearer allocation response message fed back by the second satellite base station.

[0063] FIG. 3 shows a signaling flow chart of a complete second call bearer establishment process, which specifically includes the following steps:

[0064] S1, the core network sends a paging message (Page) to the second satellite base station;

[0065] S2, the second satellite base station sends a paging message (Paging Type 4) to the called terminal;

[0066] S3, the called terminal sends an RRC connection request message (RRC Connection Request) to the second satellite base station;

[0067] S4, the second satellite base station sends an RRC connection setup message (RRC Connection Setup) carrying a radio link parameter to the called terminal;

[0068] S5, the called terminal establishes a dedicated signaling connection according to the radio link parameter, and sends an RRC connection setup complete message (RRC Connection Setup Complete) to the second satellite base station;

[0069] S6, the called terminal sends a second initial direct transfer message (Initial Direct Transfer) carrying a paging response message (Paging Response) of a non-access layer to the second satellite base station;

[0070] S7, the second satellite base station establishes an Iu connection, and sends an initial UE message (Initial UE Message) carrying the paging response message (Paging Response) to the core network;

[0071] S8, the core network initiates a security mode control process, and sends a security mode command message (Security Mode Command) to the second satellite base station;

[0072] S9, the second satellite base station sends a security mode command message (Security Mode Command) to the called terminal;

[0073] S10, the called terminal sends a security mode complete message (Security Mode Complete) to the second satellite base station;

[0074] S11, the second satellite base station sends a security mode complete message (Security Mode Complete) to the core network, and completes the security mode control process;

[0075] S12, the core network sends a direct transfer message (Direct Transfer) carrying a call setup message (Setup) of a call control layer to the second satellite base station;

[0076] S13, the second satellite base station sends a second downlink direct transfer message (Downlink Direct Transfer) carrying a call setup message (Setup) to the called terminal;

[0077] S14, the called terminal sends a second uplink direct transfer message (Uplink Direct Transfer) carrying a call confirmed message (Call Confirmed) of a non-access stratum to the second satellite base station;

[0078] S15, the second satellite base station sends a direct transfer message (Direct Transfer) carrying the call confirmed message (Call Confirmed) to the core network;

[0079] S16, the core network initiates a RAB assignment procedure and sends a radio access bearer assignment request message (RAB Assignment Request) to the second satellite base station;

[0080] S17, the second satellite base station sends a radio bearer setup message (RB Setup) to the called terminal;

[0081] S18, the called terminal sends a radio bearer setup complete message (RB Setup Complete) to the second satellite base station;

[0082] S19, the second satellite base station sends a radio access bearer assignment response message (RAB Assignment Response) to the core network, completing the RAB assignment procedure.

[0083] It can be understood that there is usually a ring time between the completion of the call bearer setup and the called terminal answering the call. During this process, the core network can receive a third uplink direct transfer message carrying a ring message of a non-access stratum sent by the called terminal through the second satellite base station, and send a third downlink direct transfer message carrying a ring message of a call control layer to the calling terminal through the first satellite base station; after the called terminal answers the call, the core network can receive a fourth uplink direct transfer message carrying an off-hook message of a non-access stratum sent by the called terminal through the second satellite base station, and send a fourth downlink direct transfer message carrying an off-hook message of a call control layer to the calling terminal through the first satellite base station; the core network can also receive a fifth uplink direct transfer message carrying an off-hook confirmation message of a non-access stratum sent by the calling terminal through the first satellite base station, and send a fifth downlink direct transfer message carrying an off-hook confirmation message of a call control layer to the called terminal through the second satellite base station.

[0084] Fig. 4 shows a signaling flow chart of the process from ringing to off-hook answering, specifically including the following steps:

[0085] S1, the called terminal sends a third uplink direct transfer message (Uplink Direct Transfer) carrying an alerting message (Alerting) of a non-access layer to the second satellite base station;

[0086] S2, the second satellite base station sends a direct transfer message (Direct Transfer) carrying the alerting message (Alerting) to the core network;

[0087] S3, the core network sends a direct transfer message (Direct Transfer) carrying the alerting message (Alerting) of a call control layer to the first satellite base station;

[0088] S4, the first satellite base station sends a third downlink direct transfer message (Downlink Direct Transfer) carrying the alerting message (Alerting) to the calling terminal;

[0089] S5, after the called terminal answers and listens, the called terminal sends a fourth uplink direct transfer message (Uplink Direct Transfer) carrying a connect message (Connect) of a non-access layer to the second satellite base station;

[0090] S6, the second satellite base station sends a direct transfer message (Direct Transfer) carrying the connect message (Connect) to the core network;

[0091] S7, the core network sends a direct transfer message (Direct Transfer) carrying the connect message (Connect) of a call control layer to the first satellite base station;

[0092] S8, the first satellite base station sends a fourth downlink direct transfer message (Downlink Direct Transfer) carrying the connect message (Connect) to the calling terminal;

[0093] S9, the calling terminal sends a fifth uplink direct transfer message (Uplink Direct Transfer) carrying a connect acknowledgement message (Connect ACK) of a non-access layer to the first satellite base station;

[0094] S10, the first satellite base station sends a direct transfer message (Direct Transfer) carrying the connect acknowledgement message (Connect ACK) to the core network;

[0095] S11, the core network sends a direct transfer message (Direct Transfer) carrying the connect acknowledgement message (Connect ACK) of a call control layer to the second satellite base station;

[0096] S12, the second satellite base station sends a fifth downlink direct transfer message (Downlink Direct Transfer) carrying a hook-on confirmation message (Connect ACK) to the called terminal;

[0097] S13, the calling terminal and the called terminal start the call process.

[0098] In some embodiments of the present disclosure, the satellite communication system of the embodiments of the present disclosure further comprises a third satellite base station and a plurality of terminals located in a target area. The core network can actively broadcast a first notification message to the plurality of terminals through the third satellite base station, and the first notification message is used to instruct the plurality of terminals to enter an emergency service mode. Each terminal includes a non-access layer call management service request message and a call setup message in an initial direct transfer message sent to the core network in the emergency service mode.

[0099] The target area can be an area where an emergency event occurs, such as a disaster relief emergency area. The third satellite base station can include the first satellite base station described above. At this time, the calling terminal corresponding to the first satellite base station is located in the target area. When the calling terminal sends the first initial direct transfer message in the emergency service mode, it simultaneously carries the non-access layer call management service request message and the call setup message. The core network normally processes the call management service request message and buffers the call setup message. Subsequently, the call setup message can be directly processed without the calling terminal sending it again, further simplifying the call setup process.

[0100] Specifically, in this scenario, the core network can establish a first call bearer by the following methods: sending a security mode command message to the calling terminal through the first satellite base station; receiving a security mode complete message fed back by the calling terminal through the first satellite base station; in response to the received and buffered non-access layer call setup message, feeding back a first downlink direct transfer message to the calling terminal through the first satellite base station, wherein the first downlink direct transfer message includes a call in progress message of the call control layer; sending a radio access bearer allocation request message to the first satellite base station, wherein the first satellite base station is configured to send a radio bearer setup message to the calling terminal and receive a radio bearer setup complete message fed back by the calling terminal; receiving a radio access bearer allocation response message fed back by the first satellite base station.

[0101] FIG. 5 shows a signaling flowchart of a complete first call bearer establishment process, specifically including the following steps:

[0102] S1, the core network determines that the terminals in the target area need to enter an emergency service mode, and sends broadcast indication information to the first satellite base station in the target area;

[0103] S2, the first satellite base station broadcasts the notification information to the calling terminal, instructing the calling terminal to enter the emergency service mode;

[0104] S3, the calling terminal sends an RRC connection request message (RRC Connection Request) to the first satellite base station;

[0105] S4, the first satellite base station sends an RRC connection setup message (RRC Connection Setup) carrying a wireless link parameter to the calling terminal;

[0106] S5, the calling terminal establishes a dedicated signaling connection according to the wireless link parameter, and sends an RRC connection setup complete message (RRC Connection Setup Complete) to the first satellite base station;

[0107] S6, the calling terminal sends a first initial direct transfer message (Initial Direct Transfer) carrying a non-access layer call management service request message (CM Service Request) and a call setup message (Setup) to the first satellite base station;

[0108] S7, the first satellite base station establishes an Iu connection, and sends an initial UE message (Initial UE Message) carrying the call management service request message (CM Service Request) and the call setup message (Setup) to the core network;

[0109] S8, the core network initiates a security mode control process, and sends a security mode command message (Security Mode Command) to the first satellite base station;

[0110] S9, the first satellite base station sends a security mode command message (Security Mode Command) to the calling terminal;

[0111] S10, the calling terminal sends a security mode complete message (Security Mode Complete) to the first satellite base station;

[0112] S11, the first satellite base station sends a security mode complete message (Security Mode Complete) to the core network, and completes the security mode control process;

[0113] S12, the core network responds to the buffered call setup message (Setup), and sends a direct transfer message (Direct Transfer) carrying a call control layer (CC) call proceeding message (Call Proceeding) to the first satellite base station;

[0114] S13, the first satellite base station sends a first downlink direct transfer message (Downlink Direct Transfer) carrying a call proceeding message (Call Proceeding) to the calling terminal;

[0115] S14, the core network initiates a radio access bearer (RAB) assignment process and sends a radio access bearer allocation request message (RAB Assignment Request) to the first satellite base station;

[0116] S15, the first satellite base station sends a radio bearer setup message (RB (Radio Bearer) Setup) to the calling terminal;

[0117] S16, the calling terminal sends a radio bearer setup complete message (RB Setup Complete) to the first satellite base station;

[0118] S17, the first satellite base station sends a radio access bearer allocation response message (RAB Assignment Response) to the core network, completing the RAB assignment process.

[0119] It should be noted that the way of establishing the second call bearer in the second system mode is the same as the way of establishing the second call bearer in the first system mode, which will not be described in detail here.

[0120] In some embodiments of the present disclosure, the core network can also broadcast a second notification message to multiple terminals in the target area through the third satellite base station, wherein the second notification message is used to instruct the multiple terminals to exit the emergency service mode.

[0121] In some embodiments of the present disclosure, in order to ensure information security and reduce information processing delay at the same time, all non-access layer messages in the satellite communication system are encrypted according to a target encryption method in the emergency service mode, wherein the target encryption method includes one of the following: no encryption, encryption using a null encryption algorithm, encryption using a preset encryption algorithm, and encryption using a key generated by the calling terminal in the last authentication.

[0122] In the embodiments of the present disclosure, the core network can determine the service scenario of the current call service through the call management service request message transmitted by the calling terminal and automatically enter the emergency service mode, thereby simplifying the processing logic, reducing the occupation of air interface resources, and reducing the delay of the call establishment process, effectively solving the technical problems of long delay and large resource occupation in the conventional call establishment process in satellite communication, which is not suitable for emergency call scenarios.

[0123] Embodiment 2

[0124] On the basis of the satellite communication system provided in Embodiment 1, the emergency satellite call method provided in the embodiments of the present disclosure can be implemented by the core network. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in a different order.

[0125] FIG. 6 is a flowchart of an emergency satellite call method according to an embodiment of the present disclosure. As shown in FIG. 6, the method comprises the following steps:

[0126] In step S602, a first initial direct transmission message sent by a calling terminal through a first satellite base station is received, wherein the first initial direct transmission message comprises a non-access layer call management service request message.

[0127] In step S604, it is determined whether the current call service meets a preset condition for entering an emergency service mode according to the call management service request message, wherein the core network does not perform authentication processing on the calling terminal and the called terminal in the call bearer establishment process in the emergency service mode.

[0128] In step S606, if the current call service meets the preset condition, the first call bearer is established between the calling terminal and the first satellite base station, the second call bearer is established between the called terminal and the second satellite base station in the emergency service mode, and the call between the calling terminal and the called terminal is completed through the first call bearer and the second call bearer.

[0129] The steps of the emergency satellite call method will be described in detail in combination with the specific implementation process.

[0130] In some embodiments of the present disclosure, in the call establishment process, the calling terminal needs to first establish an RRC connection with the first satellite base station, and then send a first initial direct transmission message to the core network through the first satellite base station, wherein the first initial direct transmission message comprises a non-access layer call management service request message.

[0131] In some embodiments of the present disclosure, after receiving the first initial direct transmission message, the core network can determine whether the current call service meets a preset condition for entering an emergency service mode according to the call management service request message, wherein the preset condition can be set as follows: the mobile user identifier corresponding to the calling terminal is located in a preset whitelist, and the calling terminal meets at least one of the following conditions: the current location of the calling terminal is located in a target area, the type of the calling terminal is a target terminal type, the user priority and / or service priority corresponding to the calling terminal is higher than a preset priority threshold, and the calling terminal has completed authentication within a preset historical time period.

[0132] It can be understood that the mobile user identifier can be an IMSI or a TMSI, and the whitelist of the terminal that can enter the emergency service mode in advance can be set and verified to ensure the security of the satellite communication process; the target area can be an area where an emergency event occurs, such as a disaster relief emergency area, and the target terminal type can be a disaster relief emergency dedicated terminal device or a terminal device specially customized by some department or unit, and the specific service scenario of the terminal can be determined by detecting the location and type of the terminal; determining the user priority or service priority is also applicable to the use demand scenario of some special department or unit; and in some scenarios, the calling terminal can have just completed authentication within a preset historical time period, such as 10 minutes, in order to save air interface resources, and can also enter the emergency service mode without authentication for the terminal.

[0133] In some embodiments of the present disclosure, when the core network establishes a first call bearer with the calling terminal through the first satellite base station, the core network can perform the following operations: sending a security mode command message to the calling terminal through the first satellite base station; receiving a security mode complete message fed back by the calling terminal through the first satellite base station; receiving a first uplink direct transmission message sent by the calling terminal through the first satellite base station, wherein the first uplink direct transmission message includes a non-access layer call establishment message; feeding back a first downlink direct transmission message to the calling terminal through the first satellite base station, wherein the first downlink direct transmission message includes a call control layer call in progress message; sending a radio access bearer allocation request message to the first satellite base station, wherein the first satellite base station is configured to send a radio bearer establishment message to the calling terminal and receive a radio bearer establishment complete message fed back by the calling terminal; and receiving a radio access bearer allocation response message fed back by the first satellite base station.

[0134] In some embodiments of the present disclosure, after the core network finds the beam in which the called terminal resides in response to the call request of the calling terminal, the core network can establish a second call bearer with the called terminal through the second satellite base station in the following manner: sending a paging message to the called terminal through the second satellite base station; receiving a second initial direct transmission message sent by the called terminal through the second satellite base station, wherein the second initial direct transmission message includes a paging response message of the non-access layer; sending a security mode command message to the called terminal through the second satellite base station; receiving a security mode complete message fed back by the called terminal through the second satellite base station; sending a second downlink direct transmission message to the called terminal through the second satellite base station, wherein the second downlink direct transmission message includes a call setup message of the call control layer; receiving a second uplink direct transmission message fed back by the called terminal through the second satellite base station, wherein the second uplink direct transmission message includes a call confirmation message of the non-access layer; sending a radio access bearer allocation request message to the second satellite base station, wherein the second satellite base station is configured to send a radio bearer setup message to the called terminal and receive a radio bearer setup complete message fed back by the called terminal; and receiving a radio access bearer allocation response message fed back by the second satellite base station.

[0135] It can be understood that, between the completion of the call bearer establishment and the called terminal answering the call, there is usually a ring time. During this period, the core network can receive a third uplink direct transmission message carrying a ring message of the non-access layer sent by the called terminal through the second satellite base station, and send a third downlink direct transmission message carrying a ring message of the call control layer to the calling terminal through the first satellite base station; after the called terminal answers the call, the core network can receive a fourth uplink direct transmission message carrying an off-hook message of the non-access layer sent by the called terminal through the second satellite base station, and send a fourth downlink direct transmission message carrying an off-hook message of the call control layer to the calling terminal through the first satellite base station; the core network can also receive a fifth uplink direct transmission message carrying an off-hook confirmation message of the non-access layer sent by the calling terminal through the first satellite base station, and send a fifth downlink direct transmission message carrying an off-hook confirmation message of the call control layer to the called terminal through the second satellite base station.

[0136] In some embodiments of the present disclosure, the core network can also actively broadcast a first notification message to a plurality of terminals in the target area through a third satellite base station in the target area, and the first notification message is used to instruct the plurality of terminals to enter an emergency service mode. Each terminal includes a call management service request message and a call setup message of the non-access layer in an initial direct transmission message sent to the core network in the emergency service mode.

[0137] The target area can be an area where an emergency event occurs, such as a disaster emergency area. The third satellite base station can include the first satellite base station described above. In this case, the calling terminal corresponding to the first satellite base station is located in the target area. When the calling terminal sends the first initial direct transmission message in the emergency service mode, the non-access layer call management service request message and the call establishment message are carried at the same time. The core network normally processes the call management service request message and caches the call establishment message. Subsequently, the call establishment message can be directly processed without the calling terminal sending again, and the call establishment process is further simplified.

[0138] Specifically, in this scenario, the core network can establish the first call bearer by the following methods: sending a security mode command message to the calling terminal through the first satellite base station; receiving the security mode complete message fed back by the calling terminal through the first satellite base station; in response to the received and cached non-access layer call establishment message, feeding back the first downlink direct transmission message to the calling terminal through the first satellite base station, wherein the first downlink direct transmission message includes: a call in progress message of the call control layer; sending a radio access bearer allocation request message to the first satellite base station, wherein the first satellite base station is configured to send a radio bearer establishment message to the calling terminal and receive the radio bearer establishment complete message fed back by the calling terminal; receiving the radio access bearer allocation response message fed back by the first satellite base station.

[0139] It should be noted that the way of establishing the second call bearer in this scenario is the same as the way of establishing the second call bearer in the first scenario, and will not be described in detail here.

[0140] In some embodiments of the present disclosure, the core network can also broadcast a second notification message to a plurality of terminals in the target area through the third satellite base station, wherein the second notification message is used to instruct the plurality of terminals to exit the emergency service mode.

[0141] In some embodiments of the present disclosure, in order to ensure information security and reduce information processing delay at the same time, in the emergency service mode, all non-access layer messages in the satellite communication system are encrypted according to a target encryption method, wherein the target encryption method includes one of the following: no encryption, encryption using a null encryption algorithm, encryption using a preset encryption algorithm, and encryption using a key generated by the calling terminal in the last authentication.

[0142] In the embodiments of the present disclosure, the core network can determine the service scenario of the current call service through the call management service request message transmitted by the calling terminal, and automatically enter the emergency service mode. By reducing the authentication process, the processing logic can be simplified, the air interface resource occupation can be reduced, and the delay of the call establishment process can be reduced. The technical problem that the conventional call establishment process in satellite communication is long, occupies a large amount of resources, and is not suitable for emergency call scenarios is effectively solved.

[0143] Embodiment 3

[0144] On the basis of the satellite communication system provided in Embodiment 1, the disclosure further provides an emergency satellite call method which can be implemented by the calling terminal. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in a different order.

[0145] FIG. 7 is a flowchart of an emergency satellite call method according to an embodiment of the disclosure. As shown in FIG. 7, the method comprises the following steps:

[0146] Step S702, in response to the first notification message broadcast by the first satellite base station through the core network, entering an emergency service mode, wherein the first notification message is used to instruct all terminals in the target area to enter the emergency service mode;

[0147] Step S704, in the emergency service mode, sending a first initial direct transmission message to the core network through the first satellite base station, wherein the first initial direct transmission message comprises a non-access layer call management service request message and a call setup message;

[0148] Step S706, establishing a first call bearer with the core network, wherein the core network is configured to establish a second call bearer with the called terminal, and the core network does not perform authentication processing on the calling terminal and the called terminal in the emergency service mode during the call bearer establishment process;

[0149] Step S708, calling the called terminal through the first call bearer, the core network and the second call bearer.

[0150] The steps of the emergency satellite call method will be described in detail below in combination with a specific implementation process.

[0151] In some embodiments of the disclosure, the core network can actively broadcast a first notification message to a plurality of terminals in the target area through a third satellite base station in the target area, the first notification message being used to instruct the plurality of terminals to enter an emergency service mode, and each terminal in the emergency service mode includes a non-access layer call management service request message and a call setup message in an initial direct transmission message sent to the core network through the third satellite base station.

[0152] Wherein, the target area can be an area where an emergency event occurs, such as a disaster relief emergency area; the third satellite base station can include the first satellite base station described above, at this time, the calling terminal corresponding to the first satellite base station is located in the target area;

[0153] Since the core network does not perform authentication processing on the calling terminal and the called terminal in the call bearer establishment process in the emergency service mode, the processing logic can be simplified, the air interface resource occupation can be reduced, and the call establishment process delay can be reduced. When the calling terminal sends the first initial direct transmission message in the emergency service mode, the non-access layer call management service request message and the call establishment message are carried at the same time, the core network normally processes the call management service request message and buffers the call establishment message, and the call establishment message can be directly processed without the calling terminal sending again, further simplifying the call establishment process.

[0154] In some embodiments of the present disclosure, when the core network establishes the first call bearer with the calling terminal through the first satellite base station, it can be performed by the following ways: sending a security mode command message to the calling terminal through the first satellite base station; receiving the security mode complete message fed back by the calling terminal through the first satellite base station; in response to the received and buffered non-access layer call establishment message, feeding back the first downlink direct transmission message to the calling terminal through the first satellite base station, wherein the first downlink direct transmission message includes: a call in progress message of the call control layer; sending a radio access bearer allocation request message to the first satellite base station, wherein the first satellite base station is configured to send a radio bearer establishment message to the calling terminal and receive the radio bearer establishment complete message fed back by the calling terminal; receiving the radio access bearer allocation response message fed back by the first satellite base station.

[0155] In some embodiments of the present disclosure, in response to the call request of the calling terminal, the core network can establish the second call bearer with the called terminal through the second satellite base station by the following ways after finding the beam in which the called terminal resides: sending a paging message to the called terminal through the second satellite base station; receiving the second initial direct transmission message sent by the called terminal through the second satellite base station, wherein the second initial direct transmission message includes: a paging response message of the non-access layer; sending a security mode command message to the called terminal through the second satellite base station; receiving the security mode complete message fed back by the called terminal through the second satellite base station; sending the second downlink direct transmission message to the called terminal through the second satellite base station, wherein the second downlink direct transmission message includes: a call establishment message of the call control layer; receiving the second uplink direct transmission message fed back by the called terminal through the second satellite base station, wherein the second uplink direct transmission message includes: a call confirmation message of the non-access layer; sending a radio access bearer allocation request message to the second satellite base station, wherein the second satellite base station is configured to send a radio bearer establishment message to the called terminal and receive the radio bearer establishment complete message fed back by the called terminal; receiving the radio access bearer allocation response message fed back by the second satellite base station.

[0156] It can be understood that, from the completion of the call bearer establishment to the called terminal answering the call, there is usually a ring time, in this process, the core network can receive the third uplink direct transmission message carrying the non-access layer ring message sent by the called terminal through the second satellite base station, and send the third downlink direct transmission message carrying the call control layer ring message to the calling terminal through the first satellite base station; after the called terminal answers and listens, the core network can receive the fourth uplink direct transmission message carrying the non-access layer off-hook message sent by the called terminal through the second satellite base station, and send the fourth downlink direct transmission message carrying the call control layer off-hook message to the calling terminal through the first satellite base station; the core network can also receive the fifth uplink direct transmission message carrying the non-access layer off-hook confirmation message sent by the calling terminal through the first satellite base station, and send the fifth downlink direct transmission message carrying the call control layer off-hook confirmation message to the called terminal through the second satellite base station.

[0157] In some embodiments of the present disclosure, the calling terminal can also exit the emergency service mode in response to the second notification message broadcast by the core network through the first satellite base station, wherein the second notification message is used to instruct all terminals in the target area to exit the emergency service mode.

[0158] In some embodiments of the present disclosure, in order to ensure information security and reduce information processing delay at the same time, in the emergency service mode, all non-access layer messages in the satellite communication system are encrypted according to a target encryption mode, wherein the target encryption mode includes one of the following: no encryption, encryption using a null encryption algorithm, encryption using a preset encryption algorithm, and encryption using a key generated by the calling terminal in the last authentication.

[0159] In the embodiments of the present disclosure, the core network can determine the service scenario of the current call service through the call management service request message transmitted by the calling terminal, and then automatically enter the emergency service mode. By reducing the authentication process, the processing logic can be simplified, the air interface resource occupation can be reduced, and the delay of the call establishment process can be reduced, thereby effectively solving the technical problems that the conventional call establishment process in satellite communication is long, occupies a large amount of resources, and is not suitable for emergency call scenarios.

[0160] Embodiment 4

[0161] According to the embodiments of the present disclosure, an emergency satellite call device for implementing the emergency satellite call method in Embodiment 2 is also provided, as shown in FIG. 8, the emergency satellite call device at least includes: a receiving module 81, a judging module 82 and a bearer module 83, wherein,

[0162] The receiving module 81 is configured to receive the first initial direct transmission message sent by the calling terminal through the first satellite base station, wherein the first initial direct transmission message includes a non-access layer call management service request message.

[0163] The judging module 82 is configured to determine, according to the call management service request message, whether the current call service meets preset conditions for entering the emergency service mode, wherein the core network does not perform authentication processing on the calling terminal and the called terminal in the call bearer establishment process in the emergency service mode;

[0164] The bearer module 83 is configured to, if the current call service meets the preset conditions, establish, in the emergency service mode, a first call bearer with the calling terminal through the first satellite base station and a second call bearer with the called terminal through the second satellite base station, and complete the call between the calling terminal and the called terminal through the first call bearer and the second call bearer.

[0165] It should be noted that the modules in the emergency satellite call device in the embodiments of the present disclosure correspond one by one to the implementation steps of the emergency satellite call method in Embodiment 2. Since Embodiment 2 has been described in detail, the details not embodied in this embodiment can be referred to Embodiment 2, and will not be described in detail here.

[0166] Embodiment 5

[0167] According to the embodiments of the present disclosure, an emergency satellite call device for implementing the emergency satellite call method in Embodiment 3 is also provided, as shown in FIG. 9, the emergency satellite call device at least includes: a response module 91, a sending module 92, an establishment module 93 and a call module 94, wherein,

[0168] The response module 91 is configured to enter the emergency service mode in response to a first notification message broadcast by the core network through the first satellite base station, wherein the first notification message is used to instruct all terminals in the target area to enter the emergency service mode;

[0169] The sending module 92 is configured to send, in the emergency service mode, a first initial direct transmission message to the core network through the first satellite base station, wherein the first initial direct transmission message includes: a non-access layer call management service request message and a call establishment message;

[0170] The establishment module 93 is configured to establish a first call bearer with the core network, wherein the core network is configured to establish a second call bearer with the called terminal, and the core network does not perform authentication processing on the calling terminal and the called terminal in the call bearer establishment process in the emergency service mode;

[0171] The call module 94 is configured to call the called terminal through the first call bearer, the core network and the second call bearer.

[0172] It should be noted that the modules in the emergency satellite call device in the embodiments of the present disclosure correspond one by one to the implementation steps of the emergency satellite call method in Embodiment 3. Since Embodiment 3 has been described in detail, the details not embodied in this embodiment can be referred to Embodiment 3, and will not be described in detail here.

[0173] Embodiment 6

[0174] According to the embodiments of the present disclosure, a computer program product is also provided, which includes a computer program. When the computer program is executed by a processor, the emergency satellite call method in Embodiment 2 or Embodiment 3 is implemented.

[0175] According to the embodiments of the present disclosure, a non-volatile storage medium is also provided, which includes a stored computer program. The device in which the non-volatile storage medium is located executes the emergency satellite call method in Embodiment 2 or Embodiment 3 by running the computer program.

[0176] According to the embodiments of the present disclosure, a processor is also provided, which is configured to run a computer program. When the computer program is run, the emergency satellite call method in Embodiment 2 or Embodiment 3 is executed.

[0177] According to the embodiments of the present disclosure, an electronic device is also provided, which includes a memory and a processor. The memory stores a computer program, and the processor is configured to execute the emergency satellite call method in Embodiment 2 or Embodiment 3 by the computer program.

[0178] In some embodiments of the present disclosure, when the computer program is run, the following steps can be executed: receiving a first initial direct transmission message sent by a first satellite base station by a calling terminal, wherein the first initial direct transmission message includes a non-access layer call management service request message; determining whether the current call service meets the preset condition for entering the emergency service mode according to the call management service request message, wherein the core network does not perform authentication processing on the calling terminal and the called terminal in the call bearer establishment process in the emergency service mode; if the current call service meets the preset condition, establishing a first call bearer with the calling terminal through the first satellite base station and a second call bearer with the called terminal through the second satellite base station in the emergency service mode, and completing the call between the calling terminal and the called terminal through the first call bearer and the second call bearer.

[0179] In some embodiments of the present disclosure, the computer program runtime can further perform the following steps: in response to the first notification message broadcast by the first satellite base station, entering an emergency service mode, wherein the first notification message is used to instruct all terminals in the target area to enter the emergency service mode; in the emergency service mode, sending a first initial direct transmission message to the core network through the first satellite base station, wherein the first initial direct transmission message includes a non-access layer call management service request message and a call setup message; establishing a first call bearer with the core network, wherein the core network is configured to establish a second call bearer with the called terminal, and the core network does not perform authentication processing on the calling terminal and the called terminal in the emergency service mode during the call bearer establishment process; and conducting a call with the called terminal through the first call bearer, the core network and the second call bearer.

[0180] In some embodiments of the present disclosure, the electronic device described above can exist in the form of a mobile terminal, a computer terminal or the like. FIG. 10 shows a hardware structure block diagram of a computer terminal configured to implement the emergency satellite call method. As shown in FIG. 10, the computer terminal 100 can include one or more processors 1002 (the processor 1002 can include, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 1004 configured to store data, and a transmission device 1006 configured to have a communication function. In addition, it can also include a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which can be included as one of the ports of the BUS bus), a network interface, a power supply and / or a camera. Those skilled in the art can understand that the structure shown in FIG. 10 is only schematic, and does not limit the structure of the electronic device described above. For example, the computer terminal 100 can also include more or fewer components than those shown in FIG. 10, or have a different configuration from that shown in FIG. 10.

[0181] It should be noted that the one or more processors 1002 and / or other data processing circuits described above can be referred to as "data processing circuits" herein. The data processing circuit can be embodied in whole or in part as software, hardware, firmware or any combination thereof. In addition, the data processing circuit can be a single independent processing module, or all or part of any one of the other elements combined into the computer terminal 100. As referred to in the embodiments of the present disclosure, the data processing circuit controls the processor (for example, the selection of the variable resistance terminal path connected to the interface).

[0182] The memory 1004 is configured to store software programs of application software and modules, such as program instructions / data storage means corresponding to the emergency satellite call method in the embodiments of the present disclosure, and the processor 1002 performs various functional applications and data processing, i.e., implements the vulnerability detection method of the application program described above, by running the software programs and modules stored in the memory 1004. The memory 1004 can include a high-speed random access memory, and can also include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory 1004 can further include memories remotely arranged with respect to the processor 1002, which can be connected to the computer terminal 100 through a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0183] The transmission device 1006 is configured to receive or send data via a network. The specific examples of the above-mentioned network can include a wireless network provided by a communication provider of the computer terminal 100. In some embodiments of the present disclosure, the transmission device 1006 includes a network adapter (Network Interface Controller, NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In some embodiments of the present disclosure, the transmission device 1006 can be a radio frequency module configured to communicate with the Internet in a wireless manner.

[0184] The display can be, for example, a touch screen type liquid crystal display (LCD), which can enable a user to interact with the user interface of the computer terminal 100.

[0185] The above-mentioned embodiment numbers are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0186] In the above-mentioned embodiments of the present disclosure, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0187] In the several embodiments of the present disclosure, it should be understood that the disclosed technology can be implemented in other ways. Of course, the above-mentioned device embodiments are only schematic. For example, the division of the units can be a logical function division, and there can be another division manner in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, units or modules, and can be electrical or other forms.

[0188] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e. may be located in one place, or may be distributed to multiple units. Part or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.

[0189] In addition, each functional unit in various embodiments of the present disclosure can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0190] If the integrated unit is realized in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present disclosure essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions to make a computer device (which can be a personal computer, a server or a network device, etc.) execute all or part of the steps of the various embodiments of the present disclosure. The aforementioned storage medium includes: a U disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a mobile hard disk, a magnetic disk or an optical disk, and various program codes that can be stored in the medium.

[0191] The above is only the preferred embodiment of the present disclosure, and it should be noted that for those skilled in the art, without departing from the principles of the present disclosure, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present disclosure. Industrial applicability

[0192] The technical solution provided by the present disclosure can be applied to the technical field of satellite communication. Specifically, in the technical solution of the present disclosure, the core network first receives an initial direct transmission message sent by a calling terminal through a first satellite base station, and the initial direct transmission message includes a non-access layer call management service request message; then, whether the current call service meets the preset condition for entering an emergency service mode is determined according to the call management service request message, wherein the core network does not perform authentication processing on the calling terminal and the called terminal in the call bearer establishment process in the emergency service mode; if the current call service meets the preset condition, the core network establishes a first call bearer with the calling terminal through the first satellite base station and establishes a second call bearer with the called terminal through a second satellite base station in the emergency service mode, and completes the call between the calling terminal and the called terminal through the first call bearer and the second call bearer. Wherein, the core network can judge the service scene of the current call service through the call management service request message transmitted by the calling terminal and automatically enter the emergency service mode, thereby simplifying the processing logic, reducing the occupation of air interface resources, and reducing the delay of the call establishment process, effectively solving the technical problems that the conventional call establishment process in satellite communication is long in delay, occupies a large amount of resources, and is not suitable for emergency call scenes.

Claims

1. A method for emergency satellite communication, applied to a core network, the method comprising: receiving a first initial direct transmission message sent by a calling terminal through a first satellite base station, wherein the first initial direct transmission message comprises a non-access layer call management service request message; determining whether a current communication service meets a preset condition for entering an emergency service mode according to the call management service request message, wherein the core network does not perform authentication processing on the calling terminal and a called terminal in a communication bearer establishment process in the emergency service mode; if the current communication service meets the preset condition, establishing a first communication bearer between the calling terminal and the first satellite base station, establishing a second communication bearer between the called terminal and a second satellite base station in the emergency service mode, and completing communication between the calling terminal and the called terminal through the first communication bearer and the second communication bearer.

2. The method of claim 1, wherein, Before receiving the first initial direct transmission message sent by the calling terminal through the first satellite base station, the method further comprises: broadcasting a first notification message to a plurality of terminals in a target area through a third satellite base station in the target area, wherein the first notification message is used to instruct the plurality of terminals to enter the emergency service mode, and each terminal comprises a non-access layer call management service request message and a call establishment message in an initial direct transmission message sent by the terminal as a calling terminal to the core network in the emergency service mode.

3. The method of claim 1, wherein, The preset condition comprises: a mobile user identity corresponding to the calling terminal is located in a preset whitelist, and the calling terminal meets at least one of the following conditions: a current location of the calling terminal is located in a target area, a type of the calling terminal is a target terminal type, a user priority and / or a service priority corresponding to the calling terminal are higher than a preset priority threshold, and the calling terminal has completed authentication in a preset historical time period.

4. The method of claim 1, wherein, Establishing the first communication bearer between the calling terminal and the first satellite base station comprises: sending a security mode command message to the calling terminal through the first satellite base station; receiving a security mode complete message fed back by the calling terminal through the first satellite base station; receiving a first uplink direct transmission message sent by the calling terminal through the first satellite base station, wherein the first uplink direct transmission message comprises a non-access layer call establishment message; feeding back a first downlink direct transmission message to the calling terminal through the first satellite base station, wherein the first downlink direct transmission message comprises a call in progress message of a call control layer; sending a radio access bearer allocation request message to the first satellite base station, wherein the first satellite base station is configured to send a radio bearer establishment message to the calling terminal and receive a radio bearer establishment complete message fed back by the calling terminal; receiving a radio access bearer allocation response message fed back by the first satellite base station.

5. The method of claim 2, wherein, The first initial direct transmission message sent by the calling terminal further comprises a non-access layer call establishment message, and establishing the first communication bearer between the calling terminal and the first satellite base station comprises: sending, by the first satellite base station, a security mode command message to the calling terminal; receiving a security mode complete message fed back by the calling terminal through the first satellite base station; in response to the received and buffered call setup message of the non-access stratum layer, feeding back, by the first satellite base station, a first downlink direct transmission message to the calling terminal, wherein the first downlink direct transmission message comprises a call in progress message of the call control layer; sending, to the first satellite base station, a radio access bearer allocation request message, wherein the first satellite base station is configured to send a radio bearer setup message to the calling terminal and receive a radio bearer setup complete message fed back by the calling terminal; receiving a radio access bearer allocation response message fed back by the first satellite base station.

6. The method of claim 1, wherein, establishing, by a second satellite base station, a second call bearer with a called terminal, comprising: sending, by the second satellite base station, a paging message to the called terminal; receiving a second initial direct transmission message sent by the called terminal through the second satellite base station, wherein the second initial direct transmission message comprises a paging response message of the non-access stratum layer; sending, by the second satellite base station, a security mode command message to the called terminal; receiving a security mode complete message fed back by the called terminal through the second satellite base station; sending, by the second satellite base station, a second downlink direct transmission message to the called terminal, wherein the second downlink direct transmission message comprises a call setup message of the call control layer; receiving a second uplink direct transmission message fed back by the called terminal through the second satellite base station, wherein the second uplink direct transmission message comprises a call confirm message of the non-access stratum layer; sending, to the second satellite base station, a radio access bearer allocation request message, wherein the second satellite base station is configured to send a radio bearer setup message to the called terminal and receive a radio bearer setup complete message fed back by the called terminal; receiving a radio access bearer allocation response message fed back by the second satellite base station.

7. The method of any one of claims 1-6, wherein, in the emergency service mode, all messages of the non-access stratum layer are encrypted according to a target encryption mode, wherein the target encryption mode comprises one of the following: no encryption, encryption using a null encryption algorithm, encryption using a preset encryption algorithm, and encryption using a key generated by the calling terminal in a previous authentication.

8. The method of claim 2, wherein, The method further comprises: broadcasting, by the third satellite base station, a second notification message to the plurality of terminals in the target area, wherein the second notification message is used to instruct the plurality of terminals to exit the emergency service mode.

9. An emergency satellite call method applied to a calling terminal, the method comprising: entering an emergency service mode in response to a first notification message broadcast by a core network through a first satellite base station, wherein the first notification message is used to instruct all terminals in a target area to enter the emergency service mode; In the emergency service mode, a first initial direct transmission message is sent to the core network through the first satellite base station, wherein the first initial direct transmission message comprises a non-access layer call management service request message and a call setup message; A first call bearer is established with the core network, wherein the core network is configured to establish a second call bearer with a called terminal, and the core network does not perform authentication processing on the calling terminal and the called terminal in the call bearer establishment process in the emergency service mode; The calling terminal is in conversation with the called terminal through the first call bearer, the core network and the second call bearer.

10. A satellite communications system, the system comprising: A calling terminal, a first satellite base station, a core network, a second satellite base station and a called terminal, wherein The core network is configured to receive a first initial direct transmission message sent by the calling terminal through the first satellite base station, wherein the first initial direct transmission message comprises a non-access layer call management service request message; it is determined whether the current call service meets the preset condition for entering the emergency service mode according to the call management service request message, wherein the core network does not perform authentication processing on the calling terminal and the called terminal in the call bearer establishment process in the emergency service mode; if the current call service meets the preset condition, the first call bearer is established with the calling terminal through the first satellite base station, the second call bearer is established with the called terminal through the second satellite base station, and the conversation between the calling terminal and the called terminal is completed through the first call bearer and the second call bearer in the emergency service mode.

11. The system of claim 10, wherein The system further comprises a third satellite base station and a plurality of terminals located in a target area; The core network is further configured to broadcast a first notification message to the plurality of terminals through the third satellite base station, wherein the first notification message is used to instruct the plurality of terminals to enter the emergency service mode, and each terminal comprises a non-access layer call management service request message and a call setup message in an initial direct transmission message sent to the core network through the third satellite base station in the emergency service mode.

12. A computer program product, comprising: A computer program, wherein the computer program is executed by a processor to implement the emergency satellite conversation method of any one of claims 1 to 9.

13. An electronic device comprising: A memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the emergency satellite conversation method of any one of claims 1 to 9 through the computer program.

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