CN116827420A - Satellite data management method, device, equipment and storage medium - Google Patents
Satellite data management method, device, equipment and storage medium Download PDFInfo
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Abstract
The application discloses a satellite data management method, a device, equipment and a storage medium, wherein the method comprises the following steps: the method comprises the steps that a satellite communication system receives a session establishment request sent by a communication terminal, wherein the session establishment request comprises communication terminal information; the satellite communication system comprises a plurality of satellites, and Unified Data Management (UDM) network elements are deployed on the satellites; the satellite communication system responds to the session establishment request, acquires session management subscription data and updates subscription through the UDM network element according to the communication terminal information, and generates subscription data modification response information; the satellite communication system transmits the subscription contract data modification response message to the communication terminal. According to the scheme, when the satellite network is accessed, the on-board subscription data management function is used for acquiring session subscription data and updating subscription, so that signaling delay in an on-board session establishment flow of a user holding a communication terminal is reduced, user experience is improved, and communication efficiency is further improved.
Description
Technical Field
The present application relates generally to the field of satellite communications technologies, and in particular, to a method, an apparatus, a device, and a storage medium for managing satellite data.
Background
In the rapid development process of satellite communication technology, satellite communication has the characteristics of wide coverage, large communication capacity, small terrain influence, high flexibility, adaptability to various services and the like, and has been increasingly applied to various fields. The global fifth generation mobile communication system (5G) network provides users with high bit rate, low latency, high capacity, multiple new services and vertically applied communication services. However, 5G networks are limited by geographical environments, resulting in an inability to guarantee network coverage in ocean and land-side remote areas. In order to break through the topography restriction, can carry out the integration with satellite network and ground network and construct the satellite-ground integration three-dimensional network of global coverage. In order to better realize the communication application of the satellite network and the ground network, the research on how to communicate the satellite-ground fusion three-dimensional network is particularly important.
Currently, in the related art, a base station (gNB) and a core network element access and mobility management function (Access and Mobility management Function, AMF), a session management function (Session Management Function, SMF), and a user plane function (User Plane Function, UPF) are used for processing on-satellite functional services such as UE access, mobility management, session management, and user plane forwarding. However, in this scheme, when the on-board network element uses the UE subscription data, the satellite and the ground are still required to acquire the subscription data in an interactive manner to perform communication, which results in higher signaling processing delay, lower communication efficiency, and influence on user experience.
Disclosure of Invention
In view of the foregoing drawbacks or shortcomings of the prior art, it is desirable to provide a satellite data management method, apparatus, device, and storage medium.
In a first aspect, the present invention provides a satellite data management method, the method comprising:
the method comprises the steps that a satellite communication system receives a session establishment request sent by a communication terminal, wherein the session establishment request comprises communication terminal information; the satellite communication system comprises a plurality of satellites, and Unified Data Management (UDM) network elements are deployed on the satellites;
the satellite communication system responds to the session establishment request, acquires session management subscription data and updates subscription through the UDM network element according to the communication terminal information, and generates subscription data modification response information;
the satellite communication system transmits the subscription contract data modification response message to the communication terminal.
In one embodiment, the satellite communication system is configured with an AMF network element, an SMF network element and a RAN network element, and the satellite communication system is configured to obtain session management subscription data and update subscription through the UDM network element according to the communication terminal information in response to the session establishment request, and generate a subscription data modification response message, and includes:
The RAN network element in the satellite communication system receives the session establishment request, selects a first target AMF network element and sends the session establishment request;
the first target AMF network element receives the session establishment request, creates a session management context request based on the communication terminal information, selects a first target SMF network element and a first target UDM network element, and sends the session management context request to the first target SMF network element;
the first target SMF network element responds to the session management context request, generates a session management subscription data acquisition request and sends the session management subscription data acquisition request to the first target UDM network element;
the first target UDM network element responds to the session management subscription data acquisition request, acquires session management subscription data and sends the session management subscription data to the first target SMF network element;
and the first target SMF network element performs updating subscription based on the session management subscription data to obtain an updating subscription result, and generates a subscription data modification response message based on the updating subscription result.
In one embodiment, before the satellite communication system receives the session establishment request sent by the communication terminal, the method further includes:
the RAN network element of the satellite communication system receives a registration request sent by a communication terminal and selects a second target AMF network element to send the registration request, wherein the registration request comprises communication terminal information;
The second target AMF network element receives the registration request, creates a context registration request based on the communication terminal information and selects a second target UDM network element;
the second target UDM network element responds to the context registration request, acquires UE subscription data and sends the UE subscription data to the second target AMF network element;
and the second target AMF network element obtains a subscription result based on the UE subscription data, generates a registration response message according to the subscription result and sends the registration response message to the communication terminal.
In one embodiment, the method further comprises:
the satellite communication system receives UE subscription data sent by a ground communication system, wherein the UE subscription data is obtained after a UDM network element of the ground communication system receives a subscription data update request of the communication terminal;
the satellite communication system determines a service satellite of the communication terminal according to the UE subscription data and sends the UE subscription data to the service satellite so that a UDM network element of the service satellite is updated based on the UE subscription data.
In one embodiment, the satellite communication system determines a service satellite of the communication terminal according to the UE subscription data, including:
Acquiring terminal position information, communication coverage information of the communication terminal and satellite position information of each satellite in the satellite communication system;
and determining coverage areas of the communication terminals based on the terminal position information and the communication coverage information, and determining service satellites of the communication terminals based on the coverage areas and the satellite position information.
In one embodiment, the updating of the UDM network element of the service satellite based on the UE subscription data includes:
the UDM network element receives and responds to the subscription data updating request, and obtains signaling execution time, feeder link transmission delay and subscription data modification notification arrival time;
the UDM network element judges whether the previous signaling flow is greater than the subscription data modification time according to the signaling execution time, the feeder link transmission delay and the subscription data modification notification arrival time;
if the subscription update result is larger than the preset subscription update result, a notification message is generated, and the notification message is sent to an AMF network element.
In one embodiment, obtaining the subscription update result includes:
the UDM network element analyzes the subscription data updating request, acquires a new subscription data result and acquires a previous execution result;
Judging whether the previous execution result is consistent with the new subscription data result;
if the contract is inconsistent, a contract signing updating result is obtained.
In a second aspect, an embodiment of the present application provides a satellite data management apparatus, including:
the receiving module is used for receiving a session establishment request sent by the communication terminal by the satellite communication system, wherein the session establishment request comprises communication terminal information; the satellite communication system comprises a plurality of satellites, and Unified Data Management (UDM) network elements are deployed on the satellites;
the processing module is used for responding to the session establishment request, acquiring session management subscription data and updating subscription through the UDM network element according to the communication terminal information, and generating subscription data modification response information;
and the sending module is used for sending the subscription data modification response message to the communication terminal by the satellite communication system.
In a third aspect, an embodiment of the present application provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the satellite data management method according to the first aspect as described above when executing the program.
In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having stored thereon a computer program for implementing the satellite data management method of the first aspect above.
The satellite communication system receives a session establishment request sent by a communication terminal, wherein the session establishment request comprises communication terminal information, the satellite communication system comprises a plurality of satellites, unified Data Management (UDM) network elements are deployed on the satellites, session management subscription data are acquired through the UDM network elements according to the communication terminal information and updated according to the session establishment request, subscription data modification response information is generated, and then the subscription data modification response information is sent to the communication terminal. Compared with the prior art, the technical scheme can enable the communication terminal to acquire session subscription data and update subscription by using the on-board subscription data management function when accessing the satellite network of the satellite communication system due to the network element of the UE subscription data management function deployed in the satellite communication system, thereby reducing signaling delay in the on-board session establishment flow of a user holding the communication terminal, improving user experience and further improving communication efficiency.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
fig. 1 is a schematic diagram of an interaction structure of an existing end-to-end communication unit according to an embodiment of the present application;
fig. 2 is a schematic parameter diagram of a typical deployment scenario of a non-terrestrial network according to an embodiment of the present application
FIG. 3 is a schematic diagram of an overall architecture of a conventional satellite-to-ground network according to an embodiment of the present application;
fig. 4 is a schematic diagram of a network architecture of an existing satellite communication according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a satellite data management system according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a satellite data management system according to another embodiment of the present application;
fig. 7 is a flow chart of a satellite data management method according to an embodiment of the present application;
fig. 8 is an interaction schematic diagram of a session establishment request method according to an embodiment of the present application;
fig. 9 is a flow chart of a subscription data registration method according to an embodiment of the present application;
fig. 10 is an interaction schematic diagram of a subscription data registration flow method according to an embodiment of the present application;
fig. 11 is an interaction schematic diagram of a subscription data updating method according to an embodiment of the present application;
Fig. 12 is a schematic structural diagram of a satellite data management device according to an embodiment of the present application;
fig. 13 is a schematic structural diagram of a computer device in a satellite communication system according to an embodiment of the present application.
Detailed Description
The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the application are shown in the drawings.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It can be understood that satellite mobile communication has the characteristics of large coverage area, long communication distance, flexible communication, stable and reliable line and the like, has quite wide application range, can provide applications such as voice, telegraph and the like, and is not only suitable for civil communication, but also suitable for military communication. In order to break through the terrain limitation, a star-ground fusion three-dimensional network is generated. The satellite-ground fusion three-dimensional network is an infrastructure which takes a ground network as a base, takes a satellite network as an extension, covers natural spaces such as space, air, land, sea and the like, and provides information guarantee for activities of various users such as space, air, land and the like. The construction of the star-ground fusion network is a long-term process which is gradually advanced and continuously perfected.
In the network architecture of the star-ground fusion network, in order to simplify the network architecture and the signaling flow, unified access authentication without sense of a user is realized, unified and intelligent flexible scheduling is realized on network resources, topology, functions and data, and a satellite can be used as a core network unified with a cellular mobile network by accessing a 3GPP RAT (radio access technology), as shown in figure 1. The end-to-end communication unit in fig. 1 comprises: (User Equipment, UE) -remote radio head (Remote Radio Head, RRH) -base station Distribution Unit (DU) base station Centralized Unit (CU) (part of the core network function) -terrestrial receiver terrestrial core network DN. Wherein, DU is responsible for the functions of independence and high real-time requirement; the CU is responsible for functions requiring information aggregation and low real-time requirements.
The above-mentioned is the deep fusion mode of satellite network and ground network, the satellite participates in and forms a special 3GPP base station, the air interface adopts 3GPP enhancement protocol, some or all functions of the base station are disposed on satellite. The architecture, functions and interfaces of the core network are enhanced and optimized by combining the characteristics of satellite access, and enhanced mobility management, session management, multi-connection management and the like are provided. The satellite as a fusion of the 3gpp at and the ground mobile network has the following four possible networking schemes:
Scheme 1: the satellite only plays a role of radio frequency relay as a regeneration and amplification of the ground base station radio signal, namely as a radio remote head (Remote Radio Head, RRH), the scheme is also transparently forwarded to the scene.
Scheme 2: the DU part of the ground base station is deployed on a satellite, the satellite has part of the functions of the base station, and the core network and the ground base station share the same, but the functions of mobility management, session management and the like are enhanced, namely the satellite serves as RRH+DU.
Scheme 3: the satellite has all functions of a base station, DU and CU are deployed on the satellite, and the core network is used for enhancing functions and is shared with a ground base station, namely, the core network serves as RRH+DU+CU.
Schemes 2 and 3 are also referred to as regenerative forward scenarios, and the satellite plays the role of an on-board base station (gNB-DU or gNB).
Scheme 4: and constructing an inter-satellite network by combining the characteristics of the low orbit satellite constellation, and establishing a routing topology and communication connection between satellites. The core network function adopts a distributed architecture, the functions are flexibly divided on the ground and the satellite, the ground realizes the complete core function, and all or part of functional components of the 5G core network are carried on the satellite, namely, the functions of the RRH+DU+CU+part of core network are used.
Wherein fig. 2 shows a parametric schematic of a typical deployment scenario of a Non-terrestrial network, which includes different platforms, altitudes, orbits and typical coverage, a typical deployment scenario of a 5G NTN (Non-Terrestrial Network ) may be seen in fig. 2, different platform satellites may include low earth orbit satellites (Low earth orbit satellite, LEO), medium earth orbit satellites (middle earth orbit, MEO), geostationary earth orbit satellites (geostationary earth orbit, GEO), airborne carrier platforms (including HAPS (high altitude platform station)), high earth orbit satellites (high elliptical orbit satellite, HEO), different platform satellites corresponding to different altitudes, orbits and typical coverage, respectively. The differences in communication with the ground are mainly in terms of high latency, wide coverage, and satellite motion.
NTN-based application scenarios will bring new problems and challenges to the design and application of non-terrestrial networks due to the altitude and moving speed of the air or space carrier, high propagation delay and doppler shift caused thereby, etc. Accordingly, 5G non-terrestrial networking requires targeted modifications or enhancements to the 5G protocol to accommodate the differences and variations described above.
In terms of high transmission delay, the GEO single-path transmission delay at the height of 35786km can reach 272.4ms (aiming at transparent forwarding satellites), the non-GEO single-path transmission delay is at least 14.2ms (600 km LEO), the MEO at the height of 10000km can reach 95.2ms, the HAPS single-path transmission delay is at least 1.526ms, and the transmission delay is still far higher than 0.033ms of a ground cellular network. The high transmission delay greatly affects the timeliness of interaction between the base station and the terminal, especially the processes of access, switching and the like which need multiple signaling interactions, HARQ (hybrid automatic repeat request) retransmission processes and the like, and further negatively affects the user experience, so that the related protocol flow needs to be improved or specifically designed.
For core network services, scheduling "services" on satellite mainly meets the following scenario requirements: (1) Special users with high security level are required to realize space direct connection in order to avoid interception in the process of service landing; (2) In some scenarios, the floor exchange may have excessive time delay, and may not meet QoS index requirements, for example, information exchange of two emergency users under the same satellite, and the time delay may be obviously reduced by scheduling the UPF on the satellite; (3) When the laser or microwave feed link between the ground gateway station and the satellite is unavailable due to weather or other factors, basic service capability is provided, and the robustness of the system is improved.
Referring now to fig. 3, fig. 3 is a schematic diagram of a general architecture of a satellite terrestrial network in the related art, where the system includes a communication terminal UE located at a user side, and a terrestrial communication system and a satellite communication system located at a network side. Wherein the satellite communication system may deploy the 5G base station gNB on the satellite based on the processing transponder. The computing and storage resources of the satellite and ground gateway stations form a unified resource pool supporting on-demand scheduling of part of the service related core network services on the satellite, such as access and mobility management functions (Access and Mobility Management Function, AMF), session management functions (Session Management Function, SMF) and user plane functions (User Plane Function, UPF). Related core network services, such as an authentication server function (Authentication Server Function, AUSF), unified data management (Unified Data Management, UDM), policy control function (Policy Control Function, PCF), DN (data network functions, such as operator service, internet access, etc.), may be deployed at a terrestrial gateway station, where communication services are performed between different core network services through different interfaces, such as communication between an SMF network element service in a satellite communication system and a PCF network element service in the terrestrial communication system through an N7 interface, and communication between an AMF network element service in the satellite communication system and an AUSF network element service in the terrestrial communication system through an N12 interface.
Referring to fig. 4, a network architecture diagram of satellite communication is presented in fig. 4, in the related art, a gNB is deployed on an NGSO (Non-GeoStationary Orbit ) satellite, a core network element amf\smf\upf is deployed on GEO, and a core network in a ground communication system deploys an ausf\udm\pcf, etc. besides the amf\smf\upf.
In the related art, the base station (gNB) and the core network element access and mobility management functions (Access and Mobility management Function, AMF), the session management functions (Session Management Function, SMF) and the user plane functions (User Plane Function, UPF) are used for processing the functional services of UE access, mobility management, session management, user plane forwarding and the like on a satellite. However, in this scheme, when the on-board network element uses the UE subscription data, the satellite and the ground are still required to acquire the subscription data in an interactive manner to perform communication, which results in higher signaling processing delay, lower communication efficiency, and influence on user experience.
Based on the defects, compared with the prior art, the technical scheme can deploy the network element with the UE subscription data management function in the satellite communication system, so that the communication terminal acquires session subscription data and updates subscription by using the on-board subscription data management function when accessing the satellite network of the satellite communication system, signaling delay in the on-board session establishment flow of a user holding the communication terminal is reduced, user experience is improved, and communication efficiency is further improved.
Fig. 5 is a schematic diagram of an implementation environment of a satellite data management method according to an embodiment of the present application. As shown in fig. 5, the implementation environment architecture includes: a communication terminal 100, a satellite communication system 200 and a terrestrial communication system 300.
Referring to fig. 6, the satellite communication system may include two layers of satellite orbits, one layer is GEO geostationary satellites, the other layer is NGSO non-geostationary satellites (e.g., low earth orbit satellites in MEO or LEO), deployment of gnbs in geostationary satellites and deployment of core network functions as needed, and deployment of gnbs in non-geostationary satellites. The ground communication system can be used for deploying a mobile communication system and carrying out unified management and control on a ground network and a satellite network. Wherein a unified data management function (Unified Data Management, UDM) in the core network is starred together with an access and mobility management function AMF, a session management function SMF, a user plane function UPF.
The geosynchronous orbit satellite GEO may comprise one or more GEO satellites and the NGSO non-geostationary satellite may comprise one or more NGSO satellites. The satellite may be a communications satellite. It can be understood that the base station with the gNB of 5G is named generation node B, logically comprises CU and DU, the CU mainly comprises the function of a non-real-time wireless high-rise stack, the DU mainly processes the function of a physical layer and the function of real-time requirements, and the main functions of the base station comprise the sending and receiving of wireless signals, the management of wireless resources and the like.
Optionally, the embodiment of the application also provides a star-ground fusion network networking schematic diagram. The satellite-ground fusion network comprises two layers of satellite orbits, wherein one layer is a geosynchronous orbit satellite GEO layer and the other layer is a non-geostationary satellite NGSO layer. Wherein, the NGSO satellite deploys the core network element as required. The UDM may be deployed for each NGSO satellite in the NGSO layer, or only one UDM may be deployed for the NGSO layer, or one UDM may be deployed for a selected one of several NGSO satellites in the NGSO layer.
Optionally, in the embodiment of the present application, a three-layer satellite system networking schematic diagram is provided, where the satellite-ground fusion network includes three layers of satellite orbits, one layer is a geosynchronous orbit satellite GEO layer, and the other two layers are a middle-orbit satellite MEO layer and a low-orbit satellite LEO layer respectively. Wherein each MEO satellite in the medium orbit satellite MEO layer deploys a UDM and each LEO satellite in the low orbit satellite LEO layer deploys a UDM. Optionally, another three-layer satellite orbit is also provided, and the three-layer satellite orbit geosynchronous orbit satellite GEO layer, the middle orbit satellite MEO layer and the low orbit satellite LEO layer are all deployed with UDMs.
As an implementation manner, the subscription data management function may be a UDM network element, or may be a completely new network element, or the corresponding function may be deployed on an existing network element, for example, in an AMF or SMF.
It should be noted that, a user holding a communication terminal may freely move within the coverage area of a beam generated by a satellite, and the communication satellite transmits a signal.
The process of managing satellite data may be performed in satellite communication system 200, among other things. The satellite communication system receives the registration request and the session establishment request transmitted by the communication terminal, so that the signaling flow is completed in response to the registration request and the session establishment request.
Alternatively, the communication terminal 100 may be a terminal device applied in a satellite communication scenario. For example, the communication terminal 100 may be an intelligent home device such as an intelligent television, an intelligent television set-top box, or the communication terminal 100 may be a mobile portable terminal such as a smart phone, a tablet computer, and an electronic book reader, or the communication terminal 100 may be an intelligent wearable device such as an intelligent glasses, an intelligent watch, or an in-vehicle terminal, which is not limited in this embodiment.
The ground communication system 300 may be a server device that provides a background service for the communication terminal 100 described above. The ground communication system 300 may include a server, a server cluster or a distributed system formed by a plurality of servers, and may also be a cloud server for providing cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, content delivery network (content delivery network, CDN), and basic cloud computing services such as big data and artificial intelligence platforms.
A communication connection is established between the satellite communication system 200 and the terrestrial communication system 300, and a communication connection is established between the communication terminal 100 and the satellite communication system 200, and between the communication terminal 100 and the terrestrial communication system 300 via a wired or wireless network. Alternatively, the wireless network or wired network described above uses standard communication techniques and/or protocols. The network is typically the Internet, but may be any network including, but not limited to, a local area network (Local Area Network, LAN), metropolitan area network (Metropolitan Area Network, MAN), wide area network (Wide Area Network, WAN), a mobile, wired or wireless network, a private network, or any combination of virtual private networks.
For easy understanding and explanation, the method, apparatus, device and storage medium for satellite data management according to the embodiments of the present application are described in detail below with reference to fig. 7 to 13.
Fig. 7 is a flowchart illustrating a satellite data management method according to an embodiment of the application, which may be performed by the satellite communication system 200. As shown in fig. 7, the method includes:
s101, a satellite communication system receives a session establishment request sent by a communication terminal, wherein the satellite data management session establishment request comprises communication terminal information; the satellite communication system comprises a plurality of satellites, and Unified Data Management (UDM) network elements are deployed on the satellites.
When the user can access the ground communication system to perform registration, session establishment, and other processes, the user preferably performs the related process through the ground communication system. When the user is located on a remote ground or the ground system cannot use the ground network due to an emergency situation, which may be a catastrophic event, for example, the user needs to complete the signaling procedure through the satellite communication system.
The above-mentioned communication terminal UE may transmit a session establishment request to the satellite communication system, the session establishment request including communication terminal information such that the satellite communication system receives the session establishment request. The communication terminal information may include MM information and SM information, and the MM information may include, for example, subscription slice information, UE usage type, RAT restriction, and the like; the SM information may include, for example, SSC mode, qoS profile, etc. The session establishment request is for the communication terminal to establish a communication connection with the satellite communication system.
S102, the satellite communication system responds to the satellite data management session establishment request, acquires session management subscription data and updates subscription through a satellite data management UDM network element according to the communication terminal information, and generates subscription data modification response information.
And S103, the satellite communication system sends the subscription contract data modification response message to the satellite data management communication terminal.
The satellite communication system is provided with an AMF network element, a SMF network element and a RAN network element, wherein the AMF network element, the SMF network element and the RAN network element can be deployed on one satellite on the same orbit, one satellite on different orbits, different satellites on a unified orbit or different satellites on different orbits.
It is appreciated that AMF (Access and Mobility management Function access and mobility management function) supports UEs with different mobility management requirements. It performs the following main tasks: a non-access stratum (NAS) signaling terminal; NAS signaling security; access layer security control; inter-core network node signaling for mobility between 3GPP access networks; idle mode UE reachability (including control and execution of paging retransmissions); managing a registration area; supporting intra-system and inter-system mobility; access authentication; access authorization, including roaming rights checking; mobility management control (subscription and policy); supporting network slicing; SMF selection.
The SMF (Session Management Function session management function) described above may support a customized mobility management scheme, such as a "mobility only initiated connection" (MICO: mobile Initiated Connection Only) or RAN enhancement function, such as an "RRC active" state, with the AMF. It performs the following main tasks: session management; UE IP address allocation and management; selecting and controlling UPF; configuring flow control at the UPF to route traffic to the appropriate destination; policy enforcement and QoS control section; and (5) notifying downlink data.
The above-mentioned UPF (User Plane Function user plane function) performs the following main tasks: anchor points moving within and between systems; an external PDU session point connected to the data network; packet routing and forwarding; a packet inspection and user plane policy rule execution section; a traffic usage report; an uplink classifier for supporting routing of traffic flows to the data network; a branching point supporting a multi-host PDU session; qoS processing for the user plane, such as packet filtering, gating, upstream and downstream rate enforcement; uplink traffic authentication (SDF to QoS flow mapping); downlink packet buffering and downlink data notification triggering.
The satellite communication system in this embodiment may further include other main network functions: "network store function" (Network Repository Function, NRF): it provides support for NF service management including registration, deregistration, authorization and discovery. "network public function" (Network Exposure Function, NEF): providing an external disclosure of network function capabilities. External exposure can be categorized into monitoring capabilities, provisioning capabilities, application impact of traffic routing, and policy/charging capabilities. "unified data management" (Unified Data Management, UDM): the 5GC supports a data storage architecture for computing and storing the separation. The unified data store (Unified Data Repository, UDR) is a master database. An unstructured data storage function (Unstructured Data Storage Function, UDSF) is introduced to store dynamic data.
As one implementation, a RAN network element in a satellite communication system receives a session establishment request, selects a first target AMF network element, the first target AMF network element receives the session establishment request, creates a session management context request based on communication terminal information, selects a first target SMF network element, and transmits the request, and selects a first target UDM network element. The first target SMF network element responds to the session management context request, generates a session management subscription data acquisition request and sends the session management subscription data acquisition request to the first target UDM network element; the first target UDM network element responds to a session management subscription data acquisition request, acquires session management subscription data and sends the session management subscription data to the first target SMF network element; the first target SMF network element performs updating subscription based on the session management subscription data to obtain an updating subscription result, and generates a subscription data modification response message based on the updating subscription result. The first target AMF network element is an AMF network element for establishing an optimal communication connection at the current time, for example, may be a light-load AMF capable of being connected at the current time, or an AMF capable of being connected and capable of serving a UE for a long time, or the like. The first target UDM network element is the UDM network element used at the current moment for establishing the optimal communication connection. The first target SMF network element is an SMF network element for establishing an optimal communication connection at the current moment.
Specifically, as shown in fig. 8, taking a communication terminal UE, a satellite communication system is configured with a RAN network element, an AMF network element, an SMF network element and a UDM network element as an example, the RAN network element in the satellite communication system receives a session establishment request sent by the UE, where the session establishment request includes communication terminal information, creates a session management context request based on the communication terminal information, and then selects a first target AMF network element, which may be that the AMF network element sends an NF discovery request to the NRF network element, where the carried information includes NF type type of the target NF of a target NF: SMF, NF type NF type of the NF consumer of NF user: AMF, version, S-NSSAIS-NSSAI from the Allowed NSSAI from allowed NSSA, etc. The NRF network element returns an available SMF network element to the first target AMF network element, and then the AMF network element selects the SMF of the service based on the information such as the load, and the SMF of the service is used as the first target SMF network element.
The first target AMF network element selects the first target UDM network element according to the SUPI and sends a Session management context request message, wherein the carried message comprises information such as SMF ID, SUPI, NF Type (SMF), PDU Session ID, DNN and the like, the first target SMF subscribes to subscription data update event to the first target UDM network element, the carried information comprises information such as SUPI, subscription data Type: session Management Subscription data, DNN, S-NSSAI and the like.
According to the satellite data management method provided by the embodiment of the application, a satellite communication system receives a session establishment request sent by a communication terminal, the session establishment request comprises communication terminal information, the satellite communication system comprises a plurality of satellites, unified Data Management (UDM) network elements are deployed on the satellites, session management subscription data are acquired through the UDM network elements according to the communication terminal information and updated according to the session establishment request, subscription data modification response information is generated, and then the subscription data modification response information is sent to the communication terminal. Compared with the prior art, the technical scheme can enable the communication terminal to acquire session subscription data and update subscription by using the on-board subscription data management function when accessing the satellite network of the satellite communication system due to the network element of the UE subscription data management function deployed in the satellite communication system, thereby reducing signaling delay in the on-board session establishment flow of a user holding the communication terminal, improving user experience and further improving communication efficiency.
In another embodiment of the present application, before the satellite communication system receives the session establishment request sent by the communication terminal, an implementation manner of registration is further provided, and referring to fig. 9, the method includes:
S201, a RAN network element of a satellite data management satellite communication system receives a registration request sent by a communication terminal and selects a second target AMF network element to send a satellite data management registration request, wherein the satellite data management registration request comprises communication terminal information.
S202, the satellite data management second target AMF network element receives the satellite data management registration request, creates a context registration request based on the satellite data management communication terminal information and selects the second target UDM network element.
S203, the satellite data management second target UDM network element responds to the satellite data management context registration request, acquires the UE subscription data and sends the UE subscription data to the satellite data management second target AMF network element.
S204, the second target AMF network element for satellite data management obtains a subscription result based on the subscription data of the UE for satellite data management, generates a registration response message according to the subscription result for satellite data management, and sends the registration response message to the communication terminal for satellite data management.
Specifically, as shown in fig. 10, taking a RAN network element, an AMF network element, and a UDM network element disposed on a satellite communication system as an example, the RAN network element in the satellite communication system receives a session establishment request sent by the UE, where the session establishment request includes communication terminal information and a message such as SUPI or 5G-GUTI, a requested nsai, an establishment cause, a registration request (registration type, SUPI or 5G-GUTI, a MICO mode preference, a requested nsai, and a PDU session state), and then selects a second target AMF network element, where the second target AMF network element may be, for example, an AMF with a light load that is based on a current time that can be connected, or an AMF network element with a long service time that can be connected that can serve the UE. The RAN network element of the satellite communication system sends a registration request to the second target AMF network element. The second target AMF network element selects the second target UDM network element according to the SUPI, registers the second target UDM network element, the carried information comprises AMF ID, SUPI, NF Type, AMF, access Type, 3GPP Access and other information, the second target AMF network element sends subscription data acquisition request information to the second target UDM, the carried information comprises SUPI, AMF ID, subscription data Type(s): access and Mobility Subscription data and other information, the carried information comprises subscription data update event to the second target UDM network element, the carried information comprises SUPI, subscription data Type(s): access and Mobility Subscription data and other information, and the registration result is generated and sent to the communication terminal to respond to the registration information.
In this embodiment, since the UE subscription data management function is deployed in the ground communication system and the satellite communication system at the same time, when the user accesses the ground network and the satellite network, the user uses the ground and satellite subscription data management functions to perform registration and session establishment signaling flows, so as to reduce signaling delay in the flows of on-satellite registration and session establishment of the user, and further improve user experience.
In another embodiment of the present application, a specific implementation manner of the UE subscription data updating and modifying method is also provided. The method comprises the following steps:
the satellite communication system receives UE subscription data sent by the ground communication system, wherein the UE subscription data is obtained after a UDM network element of the ground communication system receives a subscription data updating request of a communication terminal; the satellite communication system determines a service satellite of the communication terminal according to the UE subscription data and sends the UE subscription data to the service satellite so that a UDM network element of the service satellite is updated based on the UE subscription data.
Specifically, the ground communication system is taken as a main system, the satellite communication system is taken as an auxiliary system, when the UE subscription data changes, the UE subscription data is updated in the ground communication system, specifically, the UE subscription data is updated by interacting with a UDM network element of the ground communication system, and then the UE subscription data is generated to the satellite communication system through a feed link so as to be synchronized to a GEO synchronous orbit satellite in the satellite communication system. Further, the GEO-synchronous orbit satellite determines a service satellite of the communication terminal according to the UE subscription data, and the service satellite may be an NGSO satellite, so as to synchronize and update the UE subscription data.
In the process of determining the service satellite of the communication terminal according to the UE subscription data, the satellite communication system may first obtain terminal location information, communication coverage information of the communication terminal, and satellite location information of each satellite in the satellite communication system, determine coverage areas of the communication terminal based on the terminal location information and the communication coverage information, and determine the service satellite of the communication terminal based on the coverage areas and the satellite location information. It is understood that the communication coverage information may be communication coverage of the communication terminal in different areas at different times.
In addition, predictable changes may occur due to the position of NGSO satellites and terrestrial UEs. Thus, changes in NGSO satellites can be predicted, synchronizing UE subscription data of a UE in advance onto an NGSO satellite that is about to serve the UE.
Further, the UE subscription data is updated in the terrestrial communication system and transmitted to a satellite in the satellite communication system through the feeder link, and due to the long distance of the feeder link and high transmission delay (for example, 200+ms), there may be some signaling procedures performed by the satellite communication system according to the local UE subscription data (for example, allowing or rejecting user registration), and then the UE subscription data modification notification is received.
In this embodiment, referring to fig. 11, a UDM unit of a ground network receives a subscription data update request of a communication terminal UE, and updates the subscription data of the UE. The ground communication system generates a subscription data update request to the satellite communication system through a feeder link, wherein the subscription data update request comprises SUPI, subscription data types, session management subscription data or access and mobile subscription data, DNN, S-NSSAI and other information. A UDM network element in a satellite communication system receives and responds to a subscription data update request to acquire signaling execution time T1, feeder link transmission delay delta T and subscription data modification notification arrival time T2; the UDM network element judges whether the previous signaling flow is greater than the subscription data modification time or not according to the signaling execution time, the feed link transmission delay and the subscription data modification notification arrival time, and particularly judges whether T1 is greater than T2-delta T or not; if the result is larger than the preset value, analyzing the subscription data updating request, acquiring a new subscription data result, acquiring a previous execution result, and judging whether the previous execution result is consistent with the new subscription data result; if the subscription update results are inconsistent, a subscription update result is obtained, and a corresponding AMF network element is selected based on SUPI. The UDM network element sends the signing updating result to the AMF network element, so that the AMF network element decides whether to register or re-register according to the signing updating result, and the operations such as session release and the like.
In the process of judging whether the previous execution result and the new subscription data result are consistent, for example, the new subscription data result means that the subscription data modifies the access authority of the user or the location does not allow the UE to register in the current location, and the registration of the UE is allowed in the previous execution result, then the network initiates the de-registration; alternatively, the new subscription data result allows the UE to register, but the UE registration is rejected in the previous execution result, and the network initiates the registration.
In this embodiment, when the subscription data changes, the ground communication system is updated first, then satellite-to-ground synchronization is achieved through the feeder link, and the satellite serving the UE is predicted according to the ephemeris information to store the UE subscription data in advance, and for the subscription data update process, the time to reach the satellite, the satellite-to-ground transmission delay and the time for executing the signaling flow are modified according to the subscription data, so that whether the signaling flow needs to execute the supplementary flow is judged, signaling delay in the flows such as on-board registration and session establishment of the user can be reduced, the change frequency of the subscription data is low, and the cost of satellite-to-ground synchronization update is low.
It should be noted that although the operations of the method of the present invention are depicted in the drawings in a particular order, this does not require or imply that the operations must be performed in that particular order or that all of the illustrated operations be performed in order to achieve desirable results. Rather, the steps depicted in the flowcharts may change the order of execution. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform.
On the other hand, fig. 12 is a schematic structural diagram of a satellite data management device according to an embodiment of the present application. The apparatus may be an apparatus within a satellite communication system, as shown in fig. 12, the apparatus 400 comprising:
a receiving module 410, configured to receive a session establishment request sent by a communication terminal, where the session establishment request includes communication terminal information; the satellite communication system comprises a plurality of satellites, and Unified Data Management (UDM) network elements are deployed on the satellites;
the processing module 420 is configured to, in response to the session establishment request, obtain session management subscription data and update subscription through the UDM network element according to the communication terminal information, and generate a subscription data modification response message;
the sending module 430 is used for sending the subscription data modification response message to the communication terminal by the satellite communication system.
In one embodiment, the processing module 420 is specifically configured to:
a RAN network element in a satellite communication system receives a session establishment request and selects a first target AMF network element;
the first target AMF network element receives the session establishment request, creates a session management context request based on the communication terminal information, selects a first target SMF network element and a first target UDM network element, and sends the session management context request to the first target SMF network element;
The first target SMF network element responds to the session management context request, generates a session management subscription data acquisition request and sends the session management subscription data acquisition request to the first target UDM network element;
the first target UDM network element responds to a session management subscription data acquisition request, acquires session management subscription data and sends the session management subscription data to the first target SMF network element;
the first target SMF network element performs updating subscription based on the session management subscription data to obtain an updating subscription result, and generates a subscription data modification response message based on the updating subscription result.
In one embodiment, the apparatus is further configured to:
the RAN network element of the satellite communication system receives a registration request sent by a communication terminal and selects a second target AMF network element to send the registration request, wherein the registration request comprises communication terminal information;
the second target AMF network element receives the registration request, creates a context registration request based on the communication terminal information and selects a second target UDM network element;
the second target UDM network element responds to the context registration request, acquires UE subscription data and sends the UE subscription data to the second target AMF network element;
the second target AMF network element obtains a subscription result based on the UE subscription data, generates a registration response message according to the subscription result and sends the registration response message to the communication terminal.
In one embodiment, the apparatus is further configured to:
the satellite communication system receives UE subscription data sent by the ground communication system, wherein the UE subscription data is obtained after a UDM network element of the ground communication system receives a subscription data updating request of a communication terminal;
the satellite communication system determines a service satellite of the communication terminal according to the UE subscription data and sends the UE subscription data to the service satellite so that a UDM network element of the service satellite is updated based on the UE subscription data.
In one embodiment, the apparatus is further configured to:
acquiring terminal position information, communication coverage information of a communication terminal and satellite position information of each satellite in a satellite communication system;
the coverage area of the communication terminal is determined based on the terminal position information and the communication coverage information, and the service satellite of the communication terminal is determined based on the coverage area and the satellite position information.
In one embodiment, the apparatus is further configured to:
the UDM network element receives and responds to the subscription data updating request, and obtains signaling execution time, feeder link transmission delay and subscription data modification notification arrival time;
the UDM network element judges whether the previous signaling flow is greater than the subscription data modification time according to the signaling execution time, the feed link transmission delay and the subscription data modification notification arrival time;
If the subscription update result is larger than the preset subscription update result, a notification message is generated and sent to the AMF network element.
In one embodiment, the apparatus is further configured to:
the UDM network element analyzes the subscription data updating request, acquires a new subscription data result and acquires a previous execution result;
judging whether the previous execution result is consistent with the new subscription data result;
if the contract is inconsistent, a contract signing updating result is obtained.
The satellite data management device provided by the embodiment of the application receives a session establishment request sent by a communication terminal through a receiving module, wherein the session establishment request comprises communication terminal information; the satellite communication system comprises a plurality of satellites, wherein Unified Data Management (UDM) network elements are deployed on the satellites, the UDM network elements are used for responding to the session establishment request through a processing module, session management subscription data are acquired through the UDM network elements according to the communication terminal information, subscription is updated, subscription data modification response information is generated, and then the subscription data modification response information is sent to the communication terminal through a sending module. Compared with the prior art, the technical scheme can enable the communication terminal to acquire session subscription data and update subscription by using the on-board subscription data management function when accessing the satellite network of the satellite communication system due to the network element of the UE subscription data management function deployed in the satellite communication system, thereby reducing signaling delay in the on-board session establishment flow of a user holding the communication terminal, improving user experience and further improving communication efficiency.
In another aspect, a computer device provided in an embodiment of the present application includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the satellite data management method as described above when executing the program.
Referring now to fig. 13, fig. 13 is a schematic diagram illustrating a computer system of a ground communication system according to an embodiment of the present application.
As shown in fig. 13, the computer system 600 includes a Central Processing Unit (CPU) 601, which can perform various appropriate actions and processes according to a program stored in a Read Only Memory (ROM) 602 or a program loaded from a storage section 603 into a Random Access Memory (RAM) 603. In the RAM603, various programs and data required for the operation of the system 600 are also stored. The CPU 601, ROM 602, and RAM603 are connected to each other through a bus 604. An input/output (I/O) interface 605 is also connected to bus 604.
The following components are connected to the I/O interface 605: an input portion 606 including a keyboard, mouse, etc.; an output portion 607 including a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, a speaker, and the like; a storage section 608 including a hard disk and the like; and a communication section 609 including a network interface card such as a LAN card, a modem, or the like. The communication section 609 performs communication processing via a network such as the internet. The drive 610 is also connected to the I/O interface 605 as needed. Removable media 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is installed as needed on drive 610 so that a computer program read therefrom is installed as needed into storage section 608.
In particular, according to embodiments of the present application, the processes described above with reference to flowcharts may be implemented as computer software programs. For example, embodiments of the application include a computer program product comprising a computer program embodied on a machine-readable medium, the computer program comprising program code for performing the method shown in the flowcharts. In such an embodiment, the computer program may be downloaded and installed from the network through the communication portion 603, and/or installed from the removable medium 611. The above-described functions defined in the system of the present application are performed when the computer program is executed by a Central Processing Unit (CPU) 601.
The computer readable medium shown in the present application may be a computer readable signal medium or a computer readable storage medium, or any combination of the two. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present application, however, the computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, with the computer-readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, RF, etc., or any suitable combination of the foregoing.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units or modules involved in the embodiments of the present application may be implemented in software or in hardware. The described units or modules may also be provided in a processor, for example, as: a processor, comprising: the device comprises a receiving module, a processing module and a sending module. Wherein the names of these units or modules do not constitute a limitation of the units or modules themselves in some cases, for example, the receiving module may also be described as "a satellite communication system for receiving a session establishment request sent by a communication terminal, said session establishment request comprising communication terminal information; the satellite communication system comprises a plurality of satellites, and a Unified Data Management (UDM) network element is deployed on the satellites.
As another aspect, the present application also provides a computer-readable storage medium that may be contained in the electronic device described in the above embodiment; or may be present alone without being incorporated into the electronic device. The computer-readable storage medium stores one or more programs that when executed by one or more processors perform the satellite data management method described in the present application:
the method comprises the steps that a satellite communication system receives a session establishment request sent by a communication terminal, wherein the session establishment request comprises communication terminal information; the satellite communication system comprises a plurality of satellites, and Unified Data Management (UDM) network elements are deployed on the satellites;
the satellite communication system responds to the session establishment request, acquires session management subscription data and updates subscription through the UDM network element according to the communication terminal information, and generates subscription data modification response information;
the satellite communication system transmits the subscription contract data modification response message to the communication terminal.
In summary, the method, the device, the equipment and the storage medium for managing satellite data provided by the embodiments of the present application, the satellite communication system receives a session establishment request sent by a communication terminal, where the session establishment request includes communication terminal information, the satellite communication system includes a plurality of satellites, a unified data management UDM network element is disposed on the satellites, and in response to the session establishment request, session management subscription data is acquired and updated through the UDM network element according to the communication terminal information, and a subscription data modification response message is generated, and then the subscription data modification response message is sent to the communication terminal. Compared with the prior art, the technical scheme can enable the communication terminal to acquire session subscription data and update subscription by using the on-board subscription data management function when accessing the satellite network of the satellite communication system due to the network element of the UE subscription data management function deployed in the satellite communication system, thereby reducing signaling delay in the on-board session establishment flow of a user holding the communication terminal, improving user experience and further improving communication efficiency.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Claims (10)
1. A method of satellite data management, the method comprising:
the method comprises the steps that a satellite communication system receives a session establishment request sent by a communication terminal, wherein the session establishment request comprises communication terminal information; the satellite communication system comprises a plurality of satellites, and Unified Data Management (UDM) network elements are deployed on the satellites;
the satellite communication system responds to the session establishment request, acquires session management subscription data and updates subscription through the UDM network element according to the communication terminal information, and generates subscription data modification response information;
the satellite communication system transmits the subscription contract data modification response message to the communication terminal.
2. The method according to claim 1, wherein an access and mobility management function AMF network element, a session management function SMF network element, and a radio access network RAN network element are deployed in the satellite communication system, wherein the satellite communication system obtains session management subscription data and updates subscriptions through the UDM network element according to the communication terminal information in response to the session establishment request, and generates a subscription data modification response message, comprising:
the RAN network element in the satellite communication system receives the session establishment request, selects a first target AMF network element and sends the session establishment request;
the first target AMF network element receives the session establishment request, creates a session management context request based on the communication terminal information, selects a first target SMF network element and a first target UDM network element, and sends the session management context request to the first target SMF network element;
the first target SMF network element responds to the session management context request, generates a session management subscription data acquisition request and sends the session management subscription data acquisition request to the first target UDM network element;
the first target UDM network element responds to the session management subscription data acquisition request, acquires session management subscription data and sends the session management subscription data to the first target SMF network element;
And the first target SMF network element performs updating subscription based on the session management subscription data to obtain an updating subscription result, and generates a subscription data modification response message based on the updating subscription result.
3. The method of claim 1, wherein before the satellite communication system receives the session establishment request sent by the communication terminal, the method further comprises:
the RAN network element of the satellite communication system receives a registration request sent by a communication terminal and selects a second target AMF network element to send the registration request, wherein the registration request comprises communication terminal information;
the second target AMF network element receives the registration request, creates a context registration request based on the communication terminal information and selects a second target UDM network element;
the second target UDM network element responds to the context registration request, acquires UE subscription data and sends the UE subscription data to the second target AMF network element;
and the second target AMF network element obtains a subscription result based on the UE subscription data, generates a registration response message according to the subscription result and sends the registration response message to the communication terminal.
4. The method according to claim 1, wherein the method further comprises:
The satellite communication system receives UE subscription data sent by a ground communication system, wherein the UE subscription data is obtained after a UDM network element of the ground communication system receives a subscription data update request of the communication terminal;
the satellite communication system determines a service satellite of the communication terminal according to the UE subscription data and sends the UE subscription data to the service satellite so that a UDM network element of the service satellite is updated based on the UE subscription data.
5. The method of claim 4, wherein the satellite communication system determining a service satellite of the communication terminal based on the UE subscription data, comprises:
acquiring terminal position information, communication coverage information of the communication terminal and satellite position information of each satellite in the satellite communication system;
and determining coverage areas of the communication terminals based on the terminal position information and the communication coverage information, and determining service satellites of the communication terminals based on the coverage areas and the satellite position information.
6. The method of claim 4, wherein the UDM network element of the service satellite updates based on the UE subscription data, comprising:
The UDM network element receives and responds to the subscription data updating request, and obtains signaling execution time, feeder link transmission delay and subscription data modification notification arrival time;
the UDM network element judges whether the previous signaling flow is greater than the subscription data modification time according to the signaling execution time, the feeder link transmission delay and the subscription data modification notification arrival time;
if the subscription update result is larger than the preset subscription update result, a notification message is generated, and the notification message is sent to an AMF network element.
7. The method of claim 6, wherein obtaining a subscription update result comprises:
the UDM network element analyzes the subscription data updating request, acquires a new subscription data result and acquires a previous execution result;
judging whether the previous execution result is consistent with the new subscription data result;
if the contract is inconsistent, a contract signing updating result is obtained.
8. A satellite data management apparatus, the apparatus comprising:
the receiving module is used for receiving a session establishment request sent by the communication terminal by the satellite communication system, wherein the session establishment request comprises communication terminal information; the satellite communication system comprises a plurality of satellites, and Unified Data Management (UDM) network elements are deployed on the satellites;
The processing module is used for responding to the session establishment request, acquiring session management subscription data and updating subscription through the UDM network element according to the communication terminal information, and generating subscription data modification response information;
and the sending module is used for sending the subscription data modification response message to the communication terminal by the satellite communication system.
9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the satellite data management method according to any of claims 1-7 when executing the computer program.
10. A computer readable storage medium having stored thereon a computer program for implementing the satellite data management method according to any one of claims 1-7.
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