Signaling transmission method, ground core network equipment, ground terminal and storage medium

Abstract

The embodiment of the invention discloses a signaling transmission method, ground core network equipment, a ground terminal and a storage medium, and relates to the technical field of satellite mobile communication, and the method comprises the steps: obtaining satellite ephemeris information and communication request information of the ground terminal; and according to the satellite ephemeris information and the position information of the ground terminal, determining a target service satellite, and sending a target core network service associated with the service request type to the target service satellite, so that the target service satellite creates a core network service with the ground terminal based on the target core network service. And under the condition that the core network service is started, a communication link is formed between the ground terminal and the target service satellite to realize signaling transmission. According to the application, the target core network service associated with the service request type is deployed from the ground core network device to the target service satellite, so that the round-trip times between the ground terminal and the target service satellite in the signaling transmission process can be reduced, the signaling transmission delay is further reduced, and the signaling transmission efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of satellite communication technology, and in particular to a signaling transmission method, ground core network equipment, ground terminal and storage medium. Background Art

[0002] With the maturity of technology and market, the construction of low-orbit satellite constellations is an important direction for the development of satellite Internet. In particular, the weight of low-orbit satellites and the on-board payload processing capacity have also increased significantly with the explosive growth of the launch volume of low-orbit communication satellites. The increase in on-board payload processing capacity can further shorten the satellite's over-the-top terminal switching time, but the shortening of the over-the-top terminal switching time will cause frequent inter-satellite switching, increase the signaling transmission delay between the ground terminal and the satellite, and lead to low efficiency of signaling transmission.

[0003] Application Contents

[0004] In view of this, one of the purposes of the present application is to provide a signaling transmission method, ground core network equipment, ground terminal and storage medium, which can reduce the signaling transmission delay between the ground terminal and the satellite and improve the signaling transmission efficiency.

[0005] To achieve the above purpose, the technical solution of this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a signaling transmission method, which is applied to a terrestrial core network device, and the method includes:

[0007] Obtain satellite ephemeris information and communication request information of the ground terminal, the communication request information including the service request type and the location information of the ground terminal;

[0008] Determine the target service satellite based on the satellite ephemeris information and the position information of the ground terminal;

[0009] Sending a target core network service associated with the service request type to a target service satellite, so that the target service satellite creates a core network service with the ground terminal based on the target core network service;

[0010] When the core network service is started, a communication link is formed between the ground terminal and the target service satellite to realize signaling transmission between the ground terminal and the target service satellite.

[0011] In a possible implementation, determining a target service satellite according to satellite ephemeris information and position information of a ground terminal includes:

[0012] Determine the terminal service time and the terminal network access time of the ground terminal according to the satellite ephemeris information and the location information of the ground terminal;

[0013] When the terminal service duration is greater than or equal to the terminal network access duration, determining the first satellite as the target service satellite;

[0014] In the case where the terminal service duration is less than the terminal network access duration, determining the second satellite as the target service satellite;

[0015] Among them, the second satellite is a satellite that is backward adjacent to the first satellite in the direction of satellite movement. When the communication state of the ground terminal is idle, the first satellite is a broadcast satellite corresponding to the broadcast information received by the ground terminal. When the communication state of the ground terminal is connected, the first satellite is a source service satellite that is communicatively connected to the ground terminal.

[0016] In a possible implementation manner, when the target service satellite is the first satellite, sending the target core network service associated with the service request type to the target service satellite includes:

[0017] sending a target core network service to the first satellite via a backhaul satellite;

[0018] In the case where the target service satellite is the second satellite, sending a target core network service associated with the service request type to the target service satellite includes:

[0019] The first satellite is used to send redirection indication information to the first satellite and send the target core network service to the second satellite through the return satellite. The first satellite is also used to send redirection indication information to the ground terminal. The redirection indication information is used to instruct the ground terminal to establish a communication connection with the target service satellite.

[0020] In a possible implementation manner, before sending the target core network service to the first satellite through the backhaul satellite, the method further includes:

[0021] A feeder link is established between the ground core network equipment and the return satellite. The feeder link is used for data transmission between the ground core network equipment and the return satellite.

[0022] In a possible implementation manner, the target core network service includes a network element application and configuration data associated with the service request type.

[0023] In a second aspect, an embodiment of the present application provides a signaling transmission method, which is applied to a ground terminal, and the method includes:

[0024] Sending communication request information to the ground core network device, the communication request information including the service request type and the location information of the ground terminal;

[0025] When the communication state of the ground terminal is an idle state, receiving redirection indication information, where the redirection indication information is used to instruct the ground terminal to establish a communication link with the target service satellite to realize signaling transmission between the ground terminal and the target service satellite;

[0026] When the communication state of the ground terminal is a connected state, the terminal context information of the ground terminal is sent to the ground core network, so that the target service satellite creates new terminal context information, and the new terminal context information is used to instruct the ground terminal to establish a communication link with the target service satellite to realize signaling transmission between the ground terminal and the target service satellite;

[0027] The target service satellite is determined by the ground core network equipment according to satellite ephemeris information and the position information of the ground terminal, and the target service satellite includes a target core network service associated with the service request type.

[0028] In a possible implementation manner, the target core network service includes a network element application and configuration data associated with the service request type.

[0029] In a third aspect, an embodiment of the present application provides a ground network core device, which includes a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the signaling transmission method provided in the first aspect is implemented.

[0030] In a fourth aspect, an embodiment of the present application provides a ground terminal, which includes a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the signaling transmission method provided in the second aspect is implemented.

[0031] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the following is implemented:

[0032] The signaling transmission method provided in the first aspect; or,

[0033] The second aspect provides a signaling transmission method.

[0034] The signaling transmission method provided in the embodiment of the present application obtains satellite ephemeris information and communication request information of the ground terminal, and the communication request information includes the service request type and the location information of the ground terminal. Then, according to the satellite ephemeris information and the location information of the ground terminal, the target service satellite is determined, and the target core network service associated with the service request type is sent to the target service satellite, so that the target service satellite creates a core network service with the ground terminal based on the target core network service. When the core network service is started, a communication link is formed between the ground terminal and the target service satellite to realize signaling transmission. By deploying the target core network service associated with the service request type from the ground core network device to the target service satellite, the present application can reduce the number of round trips between the ground terminal and the target service satellite during the signaling transmission process, thereby reducing the transmission delay of the signaling and improving the signaling transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. It should be understood that the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 A schematic diagram of a low-orbit satellite link in a traditional mode;

[0037] Figure 2 A schematic diagram of the low-orbit satellite business process and time distribution under a traditional mode;

[0038] Figure 3 A flowchart of a signaling transmission method provided in an embodiment of the present application;

[0039] Figure 4 A beam pattern involved in a signaling transmission method provided in an embodiment of the present application;

[0040] Figure 5 A further beam pattern involved in a signaling transmission method provided in an embodiment of the present application;

[0041] Figure 6 A further beam pattern involved in a signaling transmission method provided in an embodiment of the present application;

[0042] Figure 7 Another signaling transmission method provided in an embodiment of the present application;

[0043] Figure 8 A logic flow chart of an idle terminal included in a signaling transmission method provided in an embodiment of the present application;

[0044] Fig. 9 A schematic diagram of the idle terminal module interaction process and time distribution included in a signaling transmission method provided in an embodiment of the present application;

[0045] Fig.10 A schematic diagram of data interaction at time T0 of an idle terminal included in a signaling transmission method provided in an embodiment of the present application;

[0046] Fig.11 A schematic diagram of data interaction at a terminal in idle state at time T1 included in a signaling transmission method provided in an embodiment of the present application;

[0047] Fig.12 A logic flow chart of a connected terminal included in a signaling transmission method provided in an embodiment of the present application;

[0048] Fig.13 A schematic diagram of the interaction process and time distribution of the connection state terminal modules included in a signaling transmission method provided in an embodiment of the present application;

[0049] Fig.14 A schematic diagram of a data format included in a signaling transmission method provided in an embodiment of the present application;

[0050] Fig.15 A signaling flow chart for establishing a feeder link included in a signaling transmission method provided in an embodiment of the present application;

[0051] Fig.16 An internal structure diagram of a ground core network device provided in an embodiment of the present application;

[0052] Fig.17 Another internal structure diagram of a ground core network device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0054] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0055] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0056] In various embodiments of the present application, the expression "or" or "at least one of A or / and B" includes any combination or all combinations of the words listed at the same time. For example, the expression "A or B" or "at least one of A or / and B" may include A, may include B, or may include both A and B.

[0057] In the description of the present application, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0058] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0059] It should be noted that, in the absence of conflict, the features in the embodiments of the present application may be combined with each other.

[0060] Furthermore, in the embodiments of the present application, the term "connection" may refer to "electrical connection" or "direct connection". "Electrical connection" may refer to direct electrical connection between two components or electrical connection between two components via one or more normally open tubes or other components.

[0061] See also Figure 1 , Figure 1 This is a schematic diagram of a low-orbit satellite link in a traditional mode. DU can represent a distributed unit, CU can represent a central unit, or DU can be regarded as part of the base station function, and DU+CU can be regarded as the full function of the base station. Figure 1 The core network in can realize the control and management of communication connections. For the purpose of unified expression, the core network here can be regarded as the ground core network equipment in the following embodiments.

[0062] See also Figure 2 , Figure 2 The figure is a schematic diagram of the low-orbit satellite business process and time distribution under a traditional mode. Figure 1 Correspondingly, Figure 2 The business process and time distribution of low-orbit satellites are specifically demonstrated. Figure 2 The following information can be obtained:

[0063] In the traditional mode, the time for a terminal to register with the network is Tcr = t1 + t2 + t3;

[0064] In the traditional mode, the time of a terminal session is Tch=t4+t5+t6;

[0065] In the traditional mode, the time for a terminal to transmit data once is Tcs=t7+t8+t9.

[0066] It can be found that in the traditional mode, the number of round trips between the ground terminal and the satellite during a signal transmission process is relatively large, which increases the transmission delay of the signal and thus reduces the efficiency of the signal transmission.

[0067] In order to solve the technical problem in the background technology, the embodiment of the present application provides a signaling transmission method, which can be applied to a ground core network device. The signaling transmission method applied to a ground core network device provided by the embodiment of the present application is first introduced below.

[0068] See also Figure 3 , Figure 3 A flowchart of a signaling transmission method provided in an embodiment of the present application, the signaling transmission method can be applied to a ground core network device, the ground core network device can implement control pole management of communication connections, and the ground core network device can be a satellite communication earth station or a gateway station.

[0069] Figure 3 The signaling transmission method in may include the following steps:

[0070] Step 310, obtaining satellite ephemeris information and communication request information of the ground terminal, wherein the communication request information includes the service request type and the location information of the ground terminal.

[0071] Step 320, determining the target service satellite according to the satellite ephemeris information and the position information of the ground terminal.

[0072] Step 330: Send the target core network service associated with the service request type to the target service satellite, so that the target service satellite creates a core network service with the ground terminal based on the target core network service.

[0073] Step 340: When the core network service is started, a communication link is formed between the ground terminal and the target service satellite to achieve signaling transmission between the ground terminal and the target service satellite.

[0074] The signaling transmission method provided in the embodiment of the present application obtains satellite ephemeris information and communication request information of the ground terminal, and the communication request information includes the service request type and the location information of the ground terminal. Then, according to the satellite ephemeris information and the location information of the ground terminal, the target service satellite is determined, and the target core network service associated with the service request type is sent to the target service satellite, so that the target service satellite creates a core network service with the ground terminal based on the target core network service. When the core network service is started, a communication link is formed between the ground terminal and the target service satellite to realize signaling transmission. By deploying the target core network service associated with the service request type from the ground core network device to the target service satellite, the present application can reduce the number of round trips between the ground terminal and the target service satellite during the signaling transmission process, thereby reducing the transmission delay of the signaling and improving the signaling transmission efficiency.

[0075] The following will describe in detail the various steps of the above-mentioned signaling transmission method applied to the ground core network equipment.

[0076] In step 310, the ground core network device may obtain satellite ephemeris information and communication request information of the ground terminal. Specifically, the ground core network device may obtain satellite ephemeris information and communication request information of the ground terminal through the backhaul satellite.

[0077] The satellite ephemeris information is a set of parameters that can be used to describe the orbit of a satellite, including the position, velocity and other orbital parameters of each satellite. Through the satellite ephemeris information, the ground core network equipment can determine the position information of each satellite.

[0078] The above-mentioned ground terminal refers to a device located on the surface of the earth and can be used to communicate and interact with satellites. The ground terminal can be installed in a fixed position. The ground terminal can also move with the movement of the user, for example, a vehicle-mounted satellite terminal, a ship-mounted satellite terminal, a handheld satellite terminal, etc.

[0079] The above-mentioned vehicle-mounted satellite terminal is usually installed on a vehicle to provide satellite communication services for the vehicle. For example, in outdoor exploration, military operations and other scenarios, the vehicle can keep in touch with the outside world through the vehicle-mounted satellite terminal. The above-mentioned ship-mounted satellite terminal is an important device for ships to communicate with satellites when sailing at sea, ensuring the navigation, communication and other needs of the ship. The above-mentioned handheld satellite terminal is small in size and easy to carry. Users can use it outdoors, in remote areas and other places without ground communication network coverage to realize functions such as voice calls, text message sending, and data transmission.

[0080] The above communication request information is generated by the ground terminal, including the service request type and the location information of the ground terminal.

[0081] In some embodiments, the above service request type may include any one of registration type, signaling, downlink data, uplink data and bidirectional data transmission.

[0082] In step 320, after determining the satellite ephemeris information and the location information of the ground terminal, the ground core network device may further determine the target service satellite based on the satellite ephemeris information and the location information of the ground terminal.

[0083] The above-mentioned target service satellite can be used to communicate with the ground terminal to realize signaling transmission.

[0084] In step 330, the ground core network device can determine the associated target core network service according to the service request type, and send it to the target service satellite determined in the above embodiment. That is, the ground core network device deploys the target core network service associated with the service request type to the target service satellite.

[0085] Specifically, deploying the target core network service associated with the business request type to the target service satellite can reduce the number of round trips between the ground terminal and the target service satellite during a signaling transmission process, thereby reducing the signaling transmission delay and improving the efficiency of signaling transmission.

[0086] For the above business request types, please refer to the introduction of the above examples.

[0087] There is an association relationship between the above-mentioned service request type and the target core network service. When the ground core network device determines the service request type, the corresponding target core network service can be quickly determined through the association relationship.

[0088] In some embodiments, the above association relationship may be stored in an association relationship table, which may be stored in a ground core network device. If the association relationship between the service request type and the target core network service changes, the association relationship between the service request type and the target core network service may be updated by modifying the association relationship table stored in the ground core network device.

[0089] After receiving the target core network service, the above-mentioned target service satellite can generate a core network service for the ground terminal based on the target core network service, so as to facilitate the establishment of a communication link between the ground terminal and the target service satellite.

[0090] In some embodiments, the ground core network device first sends the target core network service to the backhaul satellite, and then the backhaul WeChat sends the target core network service to the target service WeChat.

[0091] In step 340, after the core network service of the ground terminal is started, a communication link is formed between the ground terminal and the target service satellite. Based on the communication link, signaling transmission between the ground terminal and the target service satellite can be realized, and the target core network service associated with the service request type is deployed in the target service satellite, which can reduce the number of round trips between the ground terminal and the target service satellite during a signaling transmission process, thereby reducing the transmission delay of the signaling and improving the efficiency of the signaling transmission.

[0092] Specifically, the core network service is started, and the local base station software of the target service satellite can establish a link with the core network service through the NG port, thereby forming a communication link between the ground equipment and the target service satellite. After completing the initial network registration and session process, the ground terminal can realize data transmission with the target service satellite.

[0093] In a possible implementation, determining a target service satellite according to satellite ephemeris information and position information of a ground terminal includes:

[0094] Determine the terminal service time and the terminal network access time of the ground terminal according to the satellite ephemeris information and the location information of the ground terminal;

[0095] When the terminal service duration is greater than or equal to the terminal network access duration, determining the first satellite as the target service satellite;

[0096] In the case where the terminal service duration is less than the terminal network access duration, determining the second satellite as the target service satellite;

[0097] Among them, the second satellite is a satellite that is backward adjacent to the first satellite in the direction of satellite movement. When the communication state of the ground terminal is idle, the first satellite is a broadcast satellite corresponding to the broadcast information received by the ground terminal. When the communication state of the ground terminal is connected, the first satellite is a source service satellite that is communicatively connected to the ground terminal.

[0098] The embodiment of the present application can improve the speed of determining the target service satellite by judging the terminal service time and the terminal network access time of the ground terminal, can reduce the number of inter-satellite switching during signaling transmission, and can further improve the transmission efficiency of the signaling.

[0099] The above-mentioned terminal service duration is greater than or equal to the terminal network access duration, which may indicate that the ground terminal has time to register with the network and perform signaling transmission with the first satellite. The terminal service duration is less than the terminal network access duration, which may indicate that the terminal service duration corresponding to the first satellite has expired before the ground terminal has completed the registration with the network, and the ground terminal cannot continue to provide communication services.

[0100] If the communication status of the ground terminal is idle, it may mean that the ground terminal has not yet accessed the network for communication, or is about to access the network for communication. In this case, the ground terminal can receive the broadcast signal sent by the broadcast satellite and generate the above-mentioned communication request information based on the broadcast signal.

[0101] If the communication state of the ground terminal is a connected state, it may indicate that the ground terminal is currently in communication connection with a satellite, and the satellite of the communication connection may be referred to as a source service satellite.

[0102] The above-mentioned first satellite, when the communication state of the ground terminal is in an idle state, the first satellite can be called a broadcast satellite, and when the communication state of the ground terminal is in a connected state, the first satellite can be called a source service satellite.

[0103] In some embodiments, taking the first satellite as an example, the ground core network device can also obtain the beam information of the first satellite (including the location information of the beam center point). The ground core network device can determine whether the beam n corresponding to the first satellite meets the service time of the terminal based on the location information of the ground terminal and the location information of the beam n corresponding to the first satellite. If so, the first satellite can be determined as the target service satellite.

[0104] If the beam n corresponding to the first satellite does not meet the service time of the terminal, it is possible to obtain whether the adjacent beam n+1 of the beam corresponding to the first satellite meets the service time of the terminal. If it still does not meet the requirements, it is possible to continue to obtain whether the beam n+x under the first satellite meets the terminal service time. If both do not meet the requirements, it is possible to obtain whether the beam of the adjacent satellite of the first satellite meets the terminal service time.

[0105] See also Figure 4 , Figure 4 A beam pattern involved in a signaling transmission method provided in an embodiment of the present application. Figure 4 It can be found that the coverage area A1 of satellite S1 includes multiple beam areas area surrounded by multiple beams b1, b2,..., bn, and the satellite moves from satellite S2 to the location of satellite S1.

[0106] See also Figure 5 , Figure 5 Another beam pattern involved in a signaling transmission method provided in an embodiment of the present application. Figure 5 It can be understood that the following parameters are all known quantities:

[0107] Beam radius R;

[0108] The moving speed V of satellite S1 relative to the ground;

[0109] The longitude and latitude information (Bx, By) corresponding to the center point Cb1 of beam b1;

[0110] The latitude and longitude information (Ux, Uy) of the location A of the ground terminal;

[0111] The distance L between the location A of the ground terminal and the center point Cb1;

[0112] The moving direction D of the ground terminal relative to the beam (the opposite direction of the moving direction of the satellite S1 relative to the ground terminal).

[0113] It can be understood that the unknown parameter is: the distance S from the ground terminal to the edge of the beam b1.

[0114] When the latitude and longitude information of the center point Cb1 of the beam b1 and the location A of the ground terminal are known, the angle a between the first direction (along the distance L) and the second direction (along the moving direction D) can be calculated according to the Haversine function, where the moving direction D is parallel to the straight line corresponding to the distance L.

[0115] When the angle a between the first direction and the second direction has been calculated, the unknown quantity, ie, the distance S from the ground terminal to the edge of the beam b1 , can be determined based on the law of cosines.

[0116]

[0117] When the distance S from the ground terminal to the edge of beam b1 has been calculated as above, the time t=S / V for the ground terminal to reach the edge of beam b1 from position A can be determined based on the moving speed V of satellite S1 relative to the ground and the distance S.

[0118] The above judgment on whether the beam n corresponding to the first satellite meets the service time of the terminal, if the first satellite is regarded as the above-mentioned satellite S1, and beam n is regarded as the above-mentioned beam b1, it can be understood as whether the time t for the ground terminal to reach the edge of beam b1 from position A is greater than the total time T of the ground terminal's network access process.

[0119] If the time t is greater than the total time T, the first satellite can be determined as the target service satellite, that is, the satellite S1 can be determined as the target service satellite.

[0120] If the time t is less than the total time T (the time t corresponding to all beams under satellite S1 is less than the total time T), it is necessary to determine that other satellites except the first satellite are the target service satellites. In one embodiment, the beams of the adjacent satellites of satellite S1 can be obtained to determine the target service satellite. Figure 6 , Figure 6 Another beam pattern involved in a signaling transmission method provided in an embodiment of the present application.

[0121] exist Figure 6 It can be understood that the following parameters are all known quantities:

[0122] The latitude and longitude information (Ux, Uy) of the location A of the ground terminal;

[0123] The moving direction D of the ground terminal relative to the area where the beam b1 is located;

[0124] The longitude and latitude information (Nx, Ny) of the center point Cbn of the adjacent beam bn of the beam b1;

[0125] The longitude and latitude information (N1x, N1y) of the center point Cbn+1 of the adjacent beam bn+1 of the beam b1.

[0126] Correspondingly, the angle b between the moving direction D and the third direction (along the line connecting position A and the center point Cbn+1), and the angle c between the moving direction D and the fourth direction (along the line connecting position A and the center point Cbn) can be calculated according to the Haversine function.

[0127] In the case where the above time t is less than the total time T, the sizes of angle b and angle c can be further determined. If angle b is greater than angle c, the service beam corresponding to the ground terminal is bn, that is, the target service satellite corresponding to the ground terminal is satellite S2 corresponding to service beam bn. If angle b is less than angle c, the service beam corresponding to the ground terminal is bn+1, that is, the target service satellite corresponding to the ground terminal is the satellite corresponding to service beam bn+1 (which can be called satellite S3).

[0128] In a possible implementation manner, when the target service satellite is the first satellite, sending the target core network service associated with the service request type to the target service satellite includes:

[0129] sending a target core network service to the first satellite via a backhaul satellite;

[0130] In the case where the target service satellite is the second satellite, sending a target core network service associated with the service request type to the target service satellite includes:

[0131] The first satellite is used to send redirection indication information to the first satellite and send the target core network service to the second satellite through the return satellite. The first satellite is also used to send redirection indication information to the ground terminal. The redirection indication information is used to instruct the ground terminal to establish a communication connection with the target service satellite.

[0132] The embodiment of the present application sends the target core network service network to the first satellite in the aforementioned embodiment through a backhaul satellite, utilizing the advantages of the backhaul satellite such as wide coverage and high flexibility, greatly expanding the coverage of communication services, allowing it to connect and communicate with ground core network equipment at any location, thereby improving the stability of signaling transmission.

[0133] When the target service satellite is the second satellite, the ground core network device can simultaneously generate the above-mentioned redirection indication information when determining the target core network service associated with the service request type. The redirection indication information can be used to instruct the ground terminal to establish a communication connection with the target service satellite, i.e., the second satellite.

[0134] The above-mentioned redirection indication information can be sent by the ground core network device to the backhaul satellite, sent by the backhaul satellite to the first satellite, and then sent by the first satellite to the ground terminal.

[0135] When the target service satellite is the second satellite, if the communication state of the ground terminal is idle, the ground core network device can send the target core network service to the backhaul satellite, and then the backhaul satellite sends the target core network service to the second satellite.

[0136] In some embodiments, when the ground core network device sends the target core network service to the backhaul satellite, or sends the target core network service and redirection indication information, the target core network service can be packaged separately and GTPU data can be generated before sending it to the backhaul satellite, or the target core network service and redirection indication information can be packaged together to generate GTPU data before sending it to the backhaul satellite. The backhaul satellite needs to parse the GTPU data to obtain the target core network service, or obtain the target core network service and redirection indication information, and then continue to complete the above sending process.

[0137] In some embodiments, the first satellite and the second satellite can be distinguished by satellite identifiers, such as the identifier of the first satellite is the first identifier, the identifier of the second satellite is the second identifier, the first identifier can be regarded as the ID of the first satellite, and the second identifier can be regarded as the ID of the second satellite. If the first identifier and the second identifier are the same, it can be said that the first satellite and the second satellite are the same satellite. For the application of ID, please refer to the following example corresponding Figure 8 The introduction in will not be repeated here.

[0138] In a possible implementation manner, before sending the target core network service to the first satellite through the backhaul satellite, the method further includes:

[0139] A feeder link is established between the ground core network equipment and the return satellite. The feeder link is used for data transmission between the ground core network equipment and the return satellite.

[0140] Before using the backhaul satellite to send the target core network service, the embodiment of the present application may recommend a feeder link between the ground core network equipment and the backhaul satellite to facilitate data transmission between the ground core network equipment and the backhaul satellite.

[0141] In a possible implementation manner, the target core network service includes a network element application and configuration data associated with the service request type.

[0142] The target core network service in the embodiment of the present application includes network element applications and configuration data associated with the service request type. The aforementioned embodiment packages the target core network service to form GTPU data, which may be packaging the network element applications and configuration data to form GTPU data.

[0143] In some embodiments, the association between the service request type of the ground terminal and the network element application and configuration data can be seen in the following table:

[0144] Table 1

[0145]

[0146] The first column in Table 1 can use different values ​​to identify different service request types. For example, the service request type corresponding to the value 1 is signaling. The corresponding configuration in the last column in Table 1 is the above-mentioned configuration data.

[0147] The present application also provides a signaling transmission method, see Figure 7 , Figure 7 Another signaling transmission method provided in an embodiment of the present application is:

[0148] Applicable to the above-mentioned ground terminal, the method comprises the following steps:

[0149] Step 710: Send communication request information to the ground core network device, where the communication request information includes the service request type and the location information of the ground terminal.

[0150] Step 720, when the communication state of the ground terminal is idle, receiving redirection indication information, the redirection indication information is used to instruct the ground terminal to establish a communication link with the target service satellite to realize signaling transmission between the ground terminal and the target service satellite.

[0151] Step 730: When the communication state of the ground terminal is the connected state, the terminal context information of the ground terminal is sent to the ground core network, so that the target service satellite creates new terminal context information, and the new terminal context information is used to instruct the ground terminal to establish a communication link with the target service satellite to realize signaling transmission between the ground terminal and the target service satellite;

[0152] The target service satellite is determined by the ground core network equipment according to satellite ephemeris information and the position information of the ground terminal, and the target service satellite includes a target core network service associated with the service request type.

[0153] The signaling transmission method provided in the embodiment of the present application can be applied to the ground terminal, and Figure 3 The implementation process is similar and can achieve similar or identical technical effects. To avoid repetition, it will not be described here.

[0154] In a possible implementation manner, the target core network service includes a network element application and configuration data associated with the service request type.

[0155] In some embodiments, when the target service satellite and the ground terminal complete data transmission and data backhaul is completed between the target service satellite and the ground core network device, the target service satellite may destroy the core network service of the ground terminal (i.e., the core network subroutine of the ground terminal in the following example).

[0156] To clearly describe the specific implementation process of the above embodiment, an example will be given below based on the communication state of the ground terminal in the above embodiment:

[0157] According to the status of the ground terminal, including idle state and connected state, it is divided into the following two scenarios:

[0158] Scenario 1: A ground terminal that is in an idle state and is about to join the network or start a business. Figure 8 and Fig. 9 ,in, Figure 8 A logic flow chart of an idle terminal included in a signaling transmission method provided in an embodiment of the present application, Fig. 9 A schematic diagram of the idle terminal module interaction process and time distribution included in a signaling transmission method provided in an embodiment of the present application.

[0159] based on Figure 8 and Fig. 9 The corresponding implementation steps are as follows:

[0160] Step 11, the ground terminal receives the broadcast information of the overhead satellite (the above-mentioned broadcast satellite), and then initiates a random access message (the above-mentioned communication request information), which carries the location information of the ground terminal and the service request type;

[0161] Step 12, the random broadcast satellite S1 (the above-mentioned broadcast satellite) sends the terminal's location information and service request type to the backhaul satellite Sx, and the backhaul satellite Sx forwards this to the ground core network (the above-mentioned ground core network device);

[0162] Step 12, the ground core network determines the terminal service time t1 according to the terminal location information and the satellite ephemeris information, and if it is less than the terminal network access time t0, selects the target service satellite as satellite S2 (the aforementioned second satellite), otherwise selects the target service satellite as satellite S1 (the aforementioned first satellite);

[0163] Step 14: The ground core network encapsulates the network element application and configuration data related to the terminal service request type into GTPU data and sends it to the backhaul satellite Sx;

[0164] Step 15, the backhaul satellite Sx sends the above GTPU data to the target service satellite S2; at the same time, it sends a redirection message (the above redirection indication information) to the random broadcast satellite S1, and then the random broadcast satellite S1 sends this message to the ground terminal;

[0165] Step 16, the target service satellite S2 creates a core network subprogram (core network service of the above-mentioned ground terminal) of the user terminal 1 (the above-mentioned ground terminal) according to the GTPU data received as above;

[0166] Step 17, the local base station software of the target service satellite S2 establishes a link with the core network subroutine created above through the NG port;

[0167] Step 18: After receiving the redirection message, the ground terminal initiates a network access process and a session service process to the target service satellite S2;

[0168] according to Fig. 9 It can be found that the idle terminal process and time distribution are as follows:

[0169] The time consumption of the terminal's initial access to the network is Tnr = t1 + t2 + t3;

[0170] The time consumption of the terminal session process is Tnh=t4;

[0171] The time consumption of terminal data transmission is Tns=t5+t6;

[0172] and Figure 2 Compared with the time distribution in , it can be found that the time consumption in this example is significantly shortened, which can improve the transmission efficiency of signaling.

[0173] At the same time, scenario 1 can be applied to the network access and service processes of multiple terminals: it is divided into two processes, T0 and T1.

[0174] The schematic diagram of time T0 is as follows Fig.10 , Fig.10 A schematic diagram of data interaction at a terminal in an idle state at time T0 included in a signaling transmission method provided in an embodiment of the present application, Fig.10The content can be summarized as follows: the terminal (the above-mentioned ground terminal) uploads the location information and service request type, the core network selects the target service satellite, and sends the core network subprogram and configuration to the target service satellite.

[0175] The schematic diagram of T1 time is as follows Fig.11 , Fig.11 A schematic diagram of data interaction at a terminal in an idle state at time T1 included in a signaling transmission method provided in an embodiment of the present application, Fig.11 The content can be summarized as follows: the terminal exchanges signaling and data with the target service satellite, and the target service satellite transmits data back.

[0176] Scenario 2: A ground terminal in a connected state doing business (connected to satellite communications), see Fig.12 and Fig.13 ,in, Fig.12 A logic flow chart of a connected terminal included in a signaling transmission method provided in an embodiment of the present application, Fig.13 A schematic diagram of the interaction process and time distribution of connection-state terminal modules included in a signaling transmission method provided in an embodiment of the present application.

[0177] based on Fig.12 and Fig.13 The corresponding implementation steps are as follows:

[0178] Step 21, assuming that the ground terminal is currently transmitting data on the source service satellite S1, the source service satellite S1 determines whether the terminal needs inter-satellite handover based on the terminal position, satellite ephemeris information, and the terminal channel quality; if handover is not required, data transmission continues on this source service satellite S1, otherwise, the following steps are performed;

[0179] Step 22, the source service satellite S1 sends the location information and terminal context information of the user terminal 1 to the ground core network via the backhaul satellite Sx;

[0180] Step 23, the ground core network selects the target service satellite S2 according to the terminal location information;

[0181] Step 24, the ground core network packages the network element application and configuration data and terminal context information related to the terminal according to the current service type of the terminal;

[0182] Step 25, the ground core network sends the above data to the target service satellite S2 via the backhaul satellite Sx;

[0183] Step 26, the target service satellite S2 starts the core network subroutine and establishes a connection between the base station and the core network subroutine;

[0184] Step 27, the target service satellite S2 establishes a terminal context;

[0185] Step 28, the terminal performs time and frequency synchronization with the target satellite S2;

[0186] Step 29, the terminal performs signaling and data transmission with the target satellite S2;

[0187] Step 30, the data transmission ends, and the target satellite ends the core network subroutine and terminal context corresponding to the subroutine.

[0188] and Figure 2 Compared with the time distribution in , it can be found that the time consumption in this example is also significantly shortened (only t1 to t5), which can improve the transmission efficiency of signaling.

[0189] For the correspondence between the terminal service request types and the programs and configurations between network elements, please refer to Table 1 in the above embodiment.

[0190] The format of the GTPU data and redirection instructions can be found in Fig.14 , Fig.14 A data format diagram of a signaling transmission method provided in an embodiment of the present application. The redirection indication data format is the data format of the redirection indication information. The redirection indication tag can be as follows: Fig.14 The numbers shown are 0 for no redirection and 1 for execution.

[0191] For the above feed connections, see Fig.15 , Fig.15 A signaling flow chart for establishing a feeder link included in a signaling transmission method provided in an embodiment of the present application. The feeder link can be used for link establishment and data transmission between a backhaul satellite and a ground core network.

[0192] The present application also provides a ground core network device. The present application also provides a ground core network device. See Fig.16 , Fig.16 An internal structural diagram of a ground core network device provided for an embodiment of the present application. The ground core network device includes a processor, a memory and a network interface connected via a system bus. The memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the ground core network device stores an operating system and may also store a computer program, which, when executed by the processor, enables the processor to implement the signaling transmission method applied to the ground core network device in the above-mentioned embodiment. The internal memory may also store a computer program, which, when executed by the processor, enables the processor to execute the signaling transmission method applicable to the ground core network device. Those skilled in the art will understand that Fig.16The structure shown in the figure is only a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the ground core network equipment to which the scheme of the present application is applied. The specific ground core network equipment may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0193] The present application also provides a ground terminal. Fig.17 , Fig.17 Another internal structure diagram of a ground terminal provided for an embodiment of the present application. The ground terminal includes a processor, a memory, and a network interface connected via a system bus. The memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the ground terminal stores an operating system and may also store a computer program, which, when executed by the processor, enables the processor to implement the signaling transmission method applied to the ground terminal in the above-mentioned embodiment. The internal memory may also store a computer program, which, when executed by the processor, enables the processor to execute the signaling transmission method applicable to the ground terminal. Those skilled in the art will appreciate that Fig.17 The structure shown in the figure is only a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the ground terminal to which the scheme of the present application is applied. The specific ground terminal may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0194] An embodiment of the present application also discloses a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the signaling transmission method in the aforementioned embodiment that can be applied to a ground core network device is implemented, or the signaling transmission method in the aforementioned embodiment that can be applied to a ground terminal is implemented.

[0195] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0196] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A signaling transmission method, characterized in that: Applied to ground core network equipment, the method includes: Acquire satellite ephemeris information and communication request information of a ground terminal, wherein the communication request information includes a service request type and location information of the ground terminal; Determining a target service satellite according to the satellite ephemeris information and the position information of the ground terminal; Sending a target core network service associated with the service request type to the target service satellite, so that the target service satellite creates a core network service with the ground terminal based on the target core network service; When the core network service is started, a communication link is formed between the ground terminal and the target service satellite to achieve signaling transmission between the ground terminal and the target service satellite.

2. The method according to claim 1, characterized in that The step of determining a target service satellite according to the satellite ephemeris information and the position information of the ground terminal includes: Determining a terminal service duration and a terminal network access duration of the ground terminal according to the satellite ephemeris information and the location information of the ground terminal; When the terminal service duration is greater than or equal to the terminal network access duration, determining the first satellite as the target service satellite; In a case where the terminal service duration is less than the terminal network access duration, determining the second satellite as the target service satellite; The second satellite is a satellite that is backward adjacent to the first satellite in the direction of satellite movement; when the communication state of the ground terminal is an idle state, the first satellite is a broadcast satellite corresponding to the broadcast information received by the ground terminal; and when the communication state of the ground terminal is a connected state, the first satellite is a source service satellite that is communicatively connected to the ground terminal.

3. The method according to claim 2, characterized in that In a case where the target service satellite is the first satellite, sending the target core network service associated with the service request type to the target service satellite includes: Sending the target core network service to the first satellite via a backhaul satellite; In a case where the target service satellite is the second satellite, sending the target core network service associated with the service request type to the target service satellite includes: The redirection indication information is sent to the first satellite and the target core network service is sent to the second satellite through the return satellite. The first satellite is also used to send the redirection indication information to the ground terminal, and the redirection indication information is used to instruct the ground terminal to establish a communication connection with the target service satellite.

4. The method according to claim 3, characterized in that Before sending the target core network service to the first satellite through the backhaul satellite, the method further includes: A feeder link is established between the ground core network device and the backhaul satellite, and the feeder link is used for data transmission between the ground core network device and the backhaul satellite.

5. The method according to claim 1, characterized in that The target core network service includes network element applications and configuration data associated with the service request type.

6. A signaling transmission method, characterized in that: Applied to a ground terminal, the method comprises: Sending communication request information to the ground core network device, wherein the communication request information includes a service request type and location information of the ground terminal; When the communication state of the ground terminal is an idle state, receiving redirection indication information, wherein the redirection indication information is used to instruct the ground terminal to establish a communication link with a target service satellite to implement signaling transmission between the ground terminal and the target service satellite; When the communication state of the ground terminal is a connected state, sending the terminal context information of the ground terminal to the ground core network, so that the target service satellite creates new terminal context information, wherein the new terminal context information is used to instruct the ground terminal to establish a communication link with the target service satellite, so as to realize signaling transmission between the ground terminal and the target service satellite; The target service satellite is determined by the ground core network device according to satellite ephemeris information and location information of the ground terminal, and the target service satellite includes a target core network service associated with the service request type.

7. The method according to claim 6, characterized in that The target core network service includes network element applications and configuration data associated with the service request type.

8. A ground network core device, characterized in that: The ground network core device includes a memory and a processor, the memory stores a computer program, and the computer program implements the signaling transmission method as described in any one of claims 1 to 5 when executed by the processor.

9. A ground terminal, characterized in that: The ground terminal includes a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the method according to any one of claims 6 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer readable storage medium stores a computer program, which, when executed by a processor, implements: The signaling transmission method according to any one of claims 1 to 5; or, The signaling transmission method as claimed in any one of claims 6 to 7.

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