CN113727431B - Satellite data link establishing method, device and storage medium based on core network - Google Patents
Satellite data link establishing method, device and storage medium based on core network Download PDFInfo
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- CN113727431B CN113727431B CN202111141711.7A CN202111141711A CN113727431B CN 113727431 B CN113727431 B CN 113727431B CN 202111141711 A CN202111141711 A CN 202111141711A CN 113727431 B CN113727431 B CN 113727431B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/03—Protecting confidentiality, e.g. by encryption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
Abstract
The invention discloses a satellite data link establishing method, a satellite data link establishing device and a storage medium based on a core network, wherein the satellite data link establishing method comprises the following steps: the satellite sends a registration request to an access management network element of a core network; the access management network element determines a corresponding satellite data management network element according to the registration request and executes registration according to satellite security data requested from the satellite data management network element; after the registration is finished, the satellite sends a session establishment request to a session management network element of the core network through the access management network element; the session management network element requests satellite session data from the satellite data management network element and sends a session establishment request to a user plane network element of a core network according to the satellite session data; and the user plane network element establishes a downlink data link of the satellite according to the satellite session data and sends a session establishment response to the satellite through the session management network element so as to establish an uplink data link of the satellite. The embodiment of the invention can flexibly establish the satellite link and reduce the cost for establishing the satellite link, and can be widely applied to the field of satellite communication.
Description
Technical Field
The present invention relates to the field of satellite communications, and in particular, to a method and an apparatus for establishing a satellite data link based on a core network, and a storage medium.
Background
In a traditional satellite transmission process, a satellite is connected and communicated with a satellite control platform through a satellite signal ground receiving station, data transmitted between the satellite and the satellite control platform comprise state data reported by the satellite, control data issued by the satellite control platform and the like, if a special communication line is laid for transmission of the data such as the state data, the control data and the like, high laying cost is needed, and the maintenance cost of the special communication line, such as safety, stability and the like, needs to be increased. In addition, because the coverage area of the low-orbit and medium-orbit satellites is small relative to the coverage area of the high-orbit geostationary satellites and is not synchronous with the earth rotation, a large number of satellite signal ground receiving stations need to be laid on the ground subsequently, and if each satellite signal ground receiving station is independently laid with a satellite control platform to form a communication channel, the construction cost and the maintenance cost are increased.
Disclosure of Invention
In view of this, an object of the embodiments of the present invention is to provide a method, an apparatus, and a storage medium for establishing a satellite data link based on a core network, which can flexibly establish a satellite link and reduce the cost of establishing the satellite link.
In a first aspect, an embodiment of the present invention provides a method for establishing a satellite data link based on a core network, including the following steps:
when a satellite monitors a wireless signal of a ground signal station of a core network, the satellite sends a registration request to an access management network element of the core network;
the access management network element receives the registration request, determines a corresponding satellite data management network element according to the satellite registration request when the registration request is identified as the satellite registration request, and executes registration according to satellite security data requested from the satellite data management network element;
after the registration is completed, the satellite sends a session establishment request to a session management network element of a core network through the access management network element;
the session management network element receives the session establishment request, requests satellite session data from the satellite data management network element, and sends a session establishment request to a user plane network element of a core network according to the satellite session data;
and the user plane network element establishes a downlink data link of the satellite according to the satellite session data and sends a session establishment response to the satellite through the session management network element to establish an uplink data link of the satellite.
Optionally, the performing registration according to the satellite security data requested from the satellite data management network element specifically includes:
the access management network element sends a satellite security data request to the satellite data management network element;
the satellite data management network element receives the satellite security data request and sends a satellite security data response to the access management network element;
executing security process detection according to the satellite security data response;
and after the safety flow detection is passed, the access management network element receives the registration of the satellite.
Optionally, the sending, by the satellite, the session establishment request to the session management network element of the core network through the access management network element specifically includes:
the satellite sends a session establishment request to the access management network element;
and the access management network element receives the session establishment request, adds the address of the satellite data management network element into the session establishment request, and sends the session establishment request comprising the address of the satellite data management network element to the session management network element of the core network.
Optionally, the requesting satellite session data from the satellite data management network element specifically includes:
and the session management network element requests the satellite data management network element for the address of the satellite control platform and the satellite session parameters.
Optionally, the establishing, by the user plane network element, a downlink data link of a satellite according to the satellite session data specifically includes:
the user plane network element sends a request for establishing an encrypted data channel to the satellite control platform according to the satellite;
the satellite control platform receives the request for establishing the encrypted data channel and sends a response for establishing the encrypted data channel to the user plane network element;
and the user plane network element receives the encrypted data channel establishing response and establishes a downlink data link of the satellite according to the encrypted data channel establishing response.
Optionally, sending, by the session management network element, a session establishment response to the satellite to establish an uplink of the satellite, specifically including:
the user plane network element sends the session establishment response to the session management network element, wherein the session establishment response comprises an uplink data link address;
the session management network element receives the session establishment response, adds the satellite session parameters to the session establishment response, and sends the session establishment response added with the satellite session parameters to the satellite;
the satellite receives a session establishment response including the satellite session parameters and establishes an uplink of the satellite according to the session establishment response including the satellite session parameters.
In a second aspect, an embodiment of the present invention provides a method for establishing a satellite data link based on a core network, which is applied to a satellite terminal, and includes:
when monitoring a wireless signal of a ground signal station of a core network, sending a registration request to an access management network element of the core network; enabling the access management network element to receive the registration request, determining a corresponding satellite data management network element according to the satellite registration request when the registration request is identified as the satellite registration request, and executing registration according to satellite security data requested from the satellite data management network element;
after the registration is finished, sending a session establishment request to a session management network element of a core network through the access management network element; so that the session management network element receives the session establishment request, requests satellite session data from the satellite data management network element, and sends a session establishment request to a user plane network element of a core network according to the satellite session data; and the user plane network element establishes a downlink data link of the satellite according to the satellite session data, and sends a session establishment response to the satellite through the session management network element to establish an uplink data link of the satellite.
In a third aspect, an embodiment of the present invention provides a method for establishing a satellite data link based on a core network, which is applied to a core network side, where the core network includes an access management network element, a session management network element, and a user plane network element, and includes:
the access management network element receives a registration request sent by a satellite, determines a corresponding satellite data management network element according to the satellite registration request when the registration request is identified as the satellite registration request, and executes registration according to satellite security data requested by the satellite data management network element;
after the registration is finished, the session management network element receives a session establishment request sent by the satellite, requests satellite session data from the satellite data management network element, and sends a session establishment request to the user plane network element according to the satellite session data;
and the user plane network element establishes a downlink data link of the satellite according to the satellite session data and sends a session establishment response to the satellite through the session management network element to establish an uplink data link of the satellite.
In a fourth aspect, an embodiment of the present invention provides a satellite data link establishment apparatus based on a core network, including:
at least one processor;
at least one memory for storing at least one program;
when executed by the at least one processor, cause the at least one processor to implement the method described above.
In a fifth aspect, an embodiment of the present invention provides a storage medium, in which a program executable by a processor is stored, and the program executable by the processor is used for executing the method.
The implementation of the embodiment of the invention has the following beneficial effects: in the embodiment of the invention, a satellite completes a satellite registration process through an access management network element and a satellite data management network element, after the registration is completed, the satellite sends a session establishment request to a session management network element, the session management network element sends the session establishment request to a user plane network element according to satellite session data requested by the satellite data management network element, and the user plane network element establishes a downlink data link of the satellite according to the satellite session data and sends a session establishment response to the satellite through the session management network element so as to establish an uplink data link of the satellite; the downlink and uplink data links of the satellite are established according to the satellite data management network element, the satellite session data can be modified through the satellite data management network element to flexibly establish the satellite link, and the access management network element, the session management network element and the user plane network element in the core network are utilized in the satellite link establishment process, so that the satellite link establishment cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a satellite data link establishment system based on a core network according to an embodiment of the present invention;
fig. 2 is a schematic step flow diagram of a method for establishing a satellite data link based on a core network according to an embodiment of the present invention;
fig. 3 is a timing diagram illustrating a satellite registration procedure based on a core network according to an embodiment of the present invention;
fig. 4 is a timing diagram illustrating a satellite session establishment procedure based on a core network according to an embodiment of the present invention;
fig. 5 is a block diagram of a satellite data link establishing apparatus based on a core network according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments. The step numbers in the following embodiments are provided only for convenience of illustration, the order between the steps is not limited at all, and the execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art.
As shown in fig. 1, a represents a satellite, B represents a core network ground signal station, the mobile core network includes an access management network element, a session management network element and a user plane network element, the satellite control platform and the data network establish communication connection with the user plane network element, the satellite data management network element may be disposed in the core network or outside the core network, and the satellite data management network element establishes communication connection with the session management network element and the access management network element, respectively. When monitoring the wireless signal of a ground signal station of a core network, a satellite executes a registration process to a mobile core network served by the ground signal station to request to register on the core network; a data link is then established through the session establishment request between the satellite and the satellite control platform or some data network for transmitting data between the satellite and the satellite control platform or other device in communication with the satellite. When the core network identifies that the common terminal user which initiates the registration process and establishes the session process is not a satellite, the core network acquires the related data from the satellite data management network element.
It should be noted that the mobile core network includes a 4G core network or a 5G core network, and may also include other types of mobile core networks, and the embodiment of the present invention is not limited in particular.
As shown in fig. 2, an embodiment of the present invention provides a method for establishing a satellite data link based on a core network, including steps S100 to S500:
s100, when a satellite monitors a wireless signal of a ground signal station of a core network, the satellite sends a registration request to an access management network element of the core network.
Specifically, the satellite monitors the ground signal station of the core network all the time during the operation process, and when the satellite is connected with the access management network element of the core network, the satellite sends a registration request to the access management network element.
S200, the access management network element receives the registration request, determines a corresponding satellite data management network element according to the satellite registration request when the registration request is identified as the satellite registration request, and executes registration according to satellite security data requested from the satellite data management network element.
It should be noted that, the access management network element identifies the registration request as a satellite registration request according to the terminal type in the registration request information.
It should be noted that the satellite data management network element is used for managing configuration information of a satellite, and the function of the satellite data management network element is similar to that of an HSS (Home Subscriber Server) network element in a 4G core network or an UDM (unified data management function) network element in a 5G core network, and the difference is that the managed objects are different.
Optionally, the performing registration according to the satellite security data requested from the satellite data management network element specifically includes:
s210, the access management network element sends a satellite security data request to the satellite data management network element;
s220, the satellite data management network element receives the satellite security data request and sends a satellite security data response to the access management network element;
s230, executing safety process detection according to the satellite safety data response;
and S240, after the security process detection is passed, the access management network element receives the registration of the satellite.
Specifically, referring to fig. 3, the satellite sends a registration request to the access management network element; the access management network element requests the satellite security data from the satellite data management network element after recognizing the satellite request according to the terminal type in the registration request; after receiving the request, the satellite data management network element sends a security related data response to the access management network element; then, according to the parameters of the safety relevant data response, safety relevant processes such as authentication, NAS message encryption, integrity protection and the like are carried out among the satellite, the access management network element and the satellite data management network element; and after the safety flow is finished, the access management network element receives a registration request of the satellite, and the satellite feeds back the successful registration to the access management network element.
Those skilled in the art can understand that before the satellite uses the corresponding core network, it needs to register first, and perform the procedures of authentication, NAS encryption, integrity protection, and the like; the bidirectional authentication not only ensures the security of the access satellite, but also ensures the security of the core network accessed by the satellite.
S300, after the registration is completed, the satellite sends a session establishment request to a session management network element of a core network through the access management network element.
As will be understood by those skilled in the art, the session establishment request message carries the address of the downlink data link allocated by the satellite. The purpose of the satellite sending a session establishment request to a session management network element of the core network via the access management network element is to carry the address of the session management network element via the access management network element.
Optionally, the sending, by the satellite, a session establishment request to a session management network element of a core network through the access management network element specifically includes:
s310, the satellite sends a session establishment request to the access management network element;
s320, the access management network element receives the session establishment request, adds the address of the satellite data management network element into the session establishment request, and sends the session establishment request comprising the address of the satellite data management network element to the session management network element of the core network.
Specifically, in the process of registering a core network by a satellite, a connection is established with a satellite data management network element through an access management network element; therefore, the satellite firstly sends a session establishment request to the access management network element; and then the address of the satellite data management network element is carried by the access management network element, and the session establishment request is forwarded to the session management network element.
S400, the session management network element receives the session establishment request, requests satellite session data from the satellite data management network element, and sends the session establishment request to a user plane network element of a core network according to the satellite session data.
It should be noted that the satellite session data includes a satellite control platform address, satellite session related parameters, and the like, where the satellite session related parameters include an uplink maximum data rate, a downlink maximum data rate, addresses of other satellite devices, a data transmission priority, an encryption algorithm and a protocol for an established user plane encryption data channel, and the like.
Optionally, the requesting satellite session data from the satellite data management network element specifically includes:
s410, the session management network element requests the satellite data management network element for the address of the satellite control platform and the satellite session parameters.
Specifically, referring to fig. 4, after receiving a session establishment request of a satellite, the session management network element requests a satellite session parameter from the satellite data management network element; after receiving the request, the satellite data management network element sends a satellite session parameter response to the session management network element; and after receiving the satellite session parameter response, the session management network element sends a session establishment request to the user plane network element.
It can be understood by those skilled in the art that, when a session is established by a satellite, the session management network element may establish a data transmission channel between the corresponding satellite and the satellite related device according to the satellite data and the address of the satellite related device configured in the satellite data management network element, and a network manager may adjust the configuration parameters of the satellite on the satellite data management network element in real time, thereby improving the flexibility of establishing the session.
S500, the user plane network element establishes a downlink data link of the satellite according to the satellite session data, and sends a session establishment response to the satellite through the session management network element to establish an uplink data link of the satellite.
Specifically, after receiving the session establishment request, the user plane network element establishes a data channel between the user plane network element and the satellite control platform according to the session establishment request to establish a downlink data link, and establishes an uplink data link through the session management network element.
Optionally, the establishing, by the user plane network element, a downlink data link of a satellite according to the satellite session data specifically includes:
s510, the user plane network element sends a request for establishing an encrypted data channel to the satellite control platform according to the satellite;
s520, the satellite control platform receives the request for establishing the encrypted data channel and sends a response for establishing the encrypted data channel to the user plane network element;
s530, the user plane network element receives the encrypted data channel establishing response and establishes a downlink data link of the satellite according to the encrypted data channel establishing response.
Specifically, referring to fig. 4, after receiving a session establishment request of a session management network element, a user plane network element requests a satellite control platform to establish an encrypted data channel; after receiving the request to establish the encrypted data channel, the satellite control platform sends a response for establishing the encrypted data channel to the user plane network element; and after the user plane network element establishes the encrypted data channel response according to the receiving, establishing a downlink data link according to the downlink data link address in the encrypted data channel response establishing information.
Optionally, sending, by the session management network element, a session establishment response to the satellite to establish an uplink of the satellite, specifically including:
s540, the user plane network element sends the session establishment response to the session management network element, where the session establishment response includes an uplink address;
s550, the session management network element receives the session establishment response, adds the satellite session parameters to the session establishment response, and sends the session establishment response added with the satellite session parameters to the satellite;
and S560, the satellite receives the session establishment response containing the satellite session parameters, and establishes an uplink of the satellite according to the session establishment response containing the satellite session parameters.
Specifically, referring to fig. 4, after receiving the encrypted data channel establishment response, the user plane network element allocates an uplink data link address to the satellite, adds the uplink data link address to the session establishment response message, and then sends the session establishment response to the session management network element; after receiving the session establishment response message, the session management network element adds satellite session data (such as uplink and downlink maximum data rates, data priority and the like) acquired from the satellite data management network element into the session establishment response message, and then sends the session establishment response to the satellite; and after receiving the session establishment response message, the satellite establishes a corresponding uplink. Through the steps, the data link of the user plane is established, and the satellite control platform can directly start to transmit state data, control data or other data.
It should be noted that the reason why the satellite state data or the control data is transmitted between the satellite and the satellite control platform through the user plane network element is that the satellite generates a large amount of state data at every moment, and is not suitable for transmission using, for example, a signaling plane protocol.
It will be understood by those skilled in the art that the satellite, through the procedures of registration and session establishment, may check whether the mobile core network functions properly, thereby determining whether to use the core network.
The implementation of the embodiment of the invention has the following beneficial effects: in the embodiment of the invention, a satellite completes a satellite registration process through an access management network element and a satellite data management network element, after registration is completed, the satellite sends a session establishment request to a session management network element, the session management network element sends the session establishment request to a user plane network element according to satellite session data requested by the satellite data management network element, and the user plane network element establishes a downlink data link of the satellite according to the satellite session data and sends a session establishment response to the satellite through the session management network element so as to establish an uplink data link of the satellite; the downlink and uplink data links of the satellite are established according to the satellite data management network element, the satellite session data can be modified through the satellite data management network element to flexibly establish the satellite link, and the access management network element, the session management network element and the user plane network element in the core network are utilized in the satellite link establishment process, so that the satellite link establishment cost is reduced.
The embodiment of the invention also provides a satellite data link establishing method based on the core network, which is applied to a satellite terminal and comprises the following steps:
when monitoring the wireless signal of the ground signal station of the core network, sending a registration request to an access management network element of the core network; enabling the access management network element to receive the registration request, determining a corresponding satellite data management network element according to the satellite registration request when the registration request is identified as the satellite registration request, and executing registration according to satellite security data requested from the satellite data management network element;
after the registration is finished, sending a session establishment request to a session management network element of a core network through the access management network element; so that the session management network element receives the session establishment request, requests satellite session data from the satellite data management network element, and sends a session establishment request to a user plane network element of a core network according to the satellite session data; and the user plane network element establishes a downlink data link of the satellite according to the satellite session data, and sends a session establishment response to the satellite through the session management network element to establish an uplink data link of the satellite.
As will be appreciated by those skilled in the art, a core network based satellite data link establishment system includes a satellite and a core network end, the satellite end initiating a registration request and a session establishment request after the registration is completed to establish a satellite uplink and downlink data link.
The embodiment of the invention provides a satellite data link establishing method based on a core network, which is applied to a core network end, wherein the core network comprises an access management network element, a session management network element and a user plane network element, and the method comprises the following steps:
the access management network element receives a registration request sent by a satellite, determines a corresponding satellite data management network element according to the satellite registration request when the registration request is identified as the satellite registration request, and executes registration according to satellite security data requested by the satellite data management network element;
after the registration is finished, the session management network element receives a session establishment request sent by the satellite, requests satellite session data from the satellite data management network element, and sends a session establishment request to the user plane network element according to the satellite session data;
and the user plane network element establishes a downlink data link of the satellite according to the satellite session data and sends a session establishment response to the satellite through the session management network element to establish an uplink data link of the satellite.
It will be understood by those skilled in the art that the core network based satellite data link establishment system includes both a satellite and a core network. After receiving a registration request sent by a satellite, the core network end assists the satellite end to complete registration; after the registration is finished, when a session establishment request sent by the satellite end is received, the satellite end is assisted to finish establishing a satellite uplink data link and a satellite downlink data link.
As shown in fig. 5, an embodiment of the present invention provides a satellite data link establishment apparatus based on a core network, including:
at least one processor;
at least one memory for storing at least one program;
when executed by the at least one processor, cause the at least one processor to implement the method described above.
It can be seen that the contents in the foregoing method embodiments are all applicable to this apparatus embodiment, the functions specifically implemented by this apparatus embodiment are the same as those in the foregoing method embodiment, and the advantageous effects achieved by this apparatus embodiment are also the same as those achieved by the foregoing method embodiment.
In addition, the embodiment of the application also discloses a computer program product or a computer program, and the computer program product or the computer program is stored in a computer readable storage medium. The processor of the computer device may read the computer program from the computer-readable storage medium, and the processor executes the computer program, so that the computer device performs the satellite data link establishment method described above. Likewise, the contents of the above method embodiments are all applicable to the present storage medium embodiment, the functions specifically implemented by the present storage medium embodiment are the same as those of the above method embodiments, and the advantageous effects achieved by the present storage medium embodiment are also the same as those achieved by the above method embodiments.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A satellite data link establishment method based on a core network is characterized by comprising the following steps:
when a satellite monitors a wireless signal of a ground signal station of a core network, the satellite sends a registration request to an access management network element of the core network;
the access management network element receives the registration request, determines a corresponding satellite data management network element according to the satellite registration request when the registration request is identified as the satellite registration request, and executes registration according to satellite security data requested from the satellite data management network element;
after the registration is completed, the satellite sends a session establishment request to a session management network element of a core network through the access management network element; the method specifically comprises the following steps: the satellite sends a session establishment request to the access management network element; the access management network element receives the session establishment request, adds the address of the satellite data management network element into the session establishment request, and sends the session establishment request comprising the address of the satellite data management network element to the session management network element of the core network;
the session management network element receives the session establishment request, requests satellite session data from the satellite data management network element, and sends a session establishment request to a user plane network element of a core network according to the satellite session data;
and the user plane network element establishes a downlink data link of the satellite according to the satellite session data and sends a session establishment response to the satellite through the session management network element to establish an uplink data link of the satellite.
2. The method for establishing a satellite data link based on a core network as claimed in claim 1, wherein the performing registration according to the satellite security data requested from the satellite data management network element specifically comprises:
the access management network element sends a satellite security data request to the satellite data management network element;
the satellite data management network element receives the satellite security data request and sends a satellite security data response to the access management network element;
executing safety process detection according to the satellite safety data response;
and after the safety flow detection is passed, the access management network element receives the registration of the satellite.
3. The method for establishing a satellite data link based on a core network as claimed in claim 1, wherein said requesting satellite session data from said satellite data management network element specifically comprises:
and the session management network element requests the satellite data management network element for the address of the satellite control platform and the satellite session parameters.
4. The method for establishing a satellite data link based on a core network as claimed in claim 3, wherein the step of establishing a downlink data link of a satellite by the user plane network element according to the satellite session data specifically comprises:
the user plane network element sends a request for establishing an encrypted data channel to the satellite control platform according to the satellite;
the satellite control platform receives the request for establishing the encrypted data channel and sends a response for establishing the encrypted data channel to the user plane network element;
and the user plane network element receives the encrypted data channel establishing response and establishes a downlink data link of the satellite according to the encrypted data channel establishing response.
5. The method as claimed in claim 4, wherein the step of sending a session establishment response to the satellite through the session management network element to establish the uplink of the satellite comprises:
the user plane network element sends the session establishment response to the session management network element, wherein the session establishment response comprises an uplink data link address;
the session management network element receives the session establishment response, adds the satellite session parameters to the session establishment response, and sends the session establishment response added with the satellite session parameters to the satellite;
the satellite receives a session establishment response including the satellite session parameters and establishes an uplink of the satellite according to the session establishment response including the satellite session parameters.
6. A satellite data link establishment method based on a core network is characterized in that the method is applied to a satellite terminal and comprises the following steps:
when monitoring the wireless signal of the ground signal station of the core network, sending a registration request to an access management network element of the core network; enabling the access management network element to receive the registration request, determining a corresponding satellite data management network element according to the satellite registration request when the registration request is identified as the satellite registration request, and executing registration according to satellite security data requested from the satellite data management network element;
after the registration is finished, sending a session establishment request to a session management network element of a core network through the access management network element; so that the session management network element receives the session establishment request, requests satellite session data from the satellite data management network element, and sends a session establishment request to a user plane network element of a core network according to the satellite session data; the user plane network element establishes a downlink data link of the satellite according to the satellite session data, and sends a session establishment response to the satellite through the session management network element to establish an uplink data link of the satellite;
wherein, sending a session establishment request to a session management network element of a core network through the access management network element specifically includes: sending a session establishment request to the access management network element; and the access management network element receives the session establishment request, adds the address of the satellite data management network element into the session establishment request, and sends the session establishment request comprising the address of the satellite data management network element to the session management network element of the core network.
7. A satellite data link establishment method based on a core network is characterized in that the method is applied to a core network end, the core network comprises an access management network element, a session management network element and a user plane network element, and the method comprises the following steps:
the access management network element receives a registration request sent by a satellite, determines a corresponding satellite data management network element according to the satellite registration request when the registration request is identified as the satellite registration request, and executes registration according to satellite security data requested by the satellite data management network element;
after the registration is finished, the session management network element receives a session establishment request sent by the satellite, requests satellite session data from the satellite data management network element, and sends a session establishment request to the user plane network element according to the satellite session data;
the user plane network element establishes a downlink data link of the satellite according to the satellite session data, and sends a session establishment response to the satellite through the session management network element to establish an uplink data link of the satellite;
wherein, the receiving, by the session management network element, the session establishment request sent by the satellite specifically includes: and the access management network element receives the session establishment request sent by the satellite, adds the address of the satellite data management network element into the session establishment request, and sends the session establishment request comprising the address of the satellite data management network element to a session management network element of a core network.
8. A satellite data link establishment apparatus based on a core network, comprising:
at least one processor;
at least one memory for storing at least one program;
when executed by the at least one processor, cause the at least one processor to implement the method of any one of claims 1-7.
9. A storage medium having stored therein a program executable by a processor, wherein the program executable by the processor is adapted to perform the method of any one of claims 1-7 when executed by the processor.
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