CN112994775B - Method for fusing GEO satellite access network and 5G core network - Google Patents

Method for fusing GEO satellite access network and 5G core network Download PDF

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CN112994775B
CN112994775B CN202110158293.6A CN202110158293A CN112994775B CN 112994775 B CN112994775 B CN 112994775B CN 202110158293 A CN202110158293 A CN 202110158293A CN 112994775 B CN112994775 B CN 112994775B
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satellite
network
core network
conversion unit
module
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CN112994775A (en
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冯建元
庞立新
李�杰
宋振林
杜欢
王士华
严际
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APT Mobile Satcom Ltd
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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
    • 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
    • H04B7/18519—Operations control, administration or maintenance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/18—Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/06—Airborne or Satellite Networks

Abstract

The invention discloses a method for fusing a GEO satellite access network and a 5G core network, which relates to the technical field of communication; the system comprises a user terminal, a satellite access network and a 5G core network, wherein the satellite access network comprises a satellite network control center and a gateway function conversion module which are connected; the user terminal is respectively connected with the satellite network control center and the gateway function conversion module, and the gateway function conversion module is connected with the 5G core network; the method for fusing the GEO satellite access network and the 5G core network comprises the following steps: s10, connecting the user terminal with the communication system; s20, converting user QoS service grade information and managing QoS priority; s30, the gateway function conversion module synchronizes the distribution information of the satellite terminal and the 5G core network to I P addresses; s40, establishing a session request; the invention has the beneficial effects that: the mutual transmission and mutual operation of the control information and the service data information of the satellite communication system and the 5G communication system can be realized, so that the two technical constitution systems are fused.

Description

Method for fusing GEO satellite access network and 5G core network
Technical Field
The invention relates to the technical field of communication, in particular to a method for fusing a GEO satellite access network and a 5G core network.
Background
Satellite communication and 5G communication are important communication means used by people. However, the satellite communication system and the 5G communication system are two distinct communication systems, and the most important difference is that the technical systems of the satellite communication and the 5G communication are distinct except the space and the ground. Due to different technical systems, the types, formats and transmission modes of control information and service data information transmitted in the satellite communication system and the 5G communication system are different.
Because the satellite communication link is required to be used as an access network of the communication system, and the 5G core network is used as a core network of the communication system, the two networks are combined to form a new converged communication system. Due to the difference of the technical systems, the two parts cannot interact with each other when the control information is seen, the service data cannot circulate, and the two parts cannot be directly fused.
Some international organizations have conducted a series of related studies, mainly including Sat5G, 3GPP and ITU.
Sat5G focuses on research and evaluation of network architecture solutions for fusing the satellite and the ground 5G, research of commercial value propositions for fusing the satellite and the ground 5G, definition and development of key technologies related to fusing the satellite and the ground 5G, verification of key technologies in a laboratory test environment, promotion of standardization of fusing the satellite and the ground 5G in 3GPP and ETSI, and the like.
The benefits and special requirements of using satellite access in 5G are explored in 3GPP, and the wide area coverage capability of satellites is considered to be indispensable in some industrial application scenarios. In the technical report of 3GPP, a deployment scenario of a non-terrestrial network including a satellite network is defined, including mobile platforms such as airplanes and high-speed trains, maritime applications, and the like, and by means of the excellent broadcast and multicast capabilities of the satellite, the performance of 5G data distribution to the network edge or directly to user equipment can be enhanced, as shown in fig. 1, 4 forms of network architecture and channel models are proposed, and in the next stage of work, this project will evaluate the access network protocol and architecture related to the satellite.
As shown in fig. 2-5, the International Telecommunication Union (ITU) proposes 4 application scenarios of satellite-to-ground 5G fusion, where fig. 2 is a relay-to-station scenario, fig. 3 is a cell backhaul scenario, fig. 4 is a communication-in-the-middle scenario, and fig. 5 is a hybrid multicast scenario, and proposes to support these key factors that must be considered, including multicast support, intelligent routing support, dynamic cache management and adaptive flow support, latency, consistent quality of service, NFV (Network Function Virtualization), Network Function Virtualization)/SDN (Software Defined Network) compatibility, flexibility of business model, and the like.
In the prior art, Sat5G mainly adopts a method that a satellite access network uses a technical system of a 5G access network by changing a satellite communication system, so that the types, formats and transfer modes of control information and service information of the satellite access network are the same as those of the 5G core network, and a new satellite access network can be fused and docked with the 5G core network. The method does not reserve the prior art system of the satellite, and has the advantages that firstly, the satellite technology is greatly changed, the technical cost is high, and some technologies are not suitable for the environment of satellite communication; secondly, the large number of existing satellites currently in service on the day cannot accomplish this change and cannot be used in this manner.
Both 3GPP and ITU adopt satellite communication as relay service of ground communication, and a satellite link is used as a transparent pipeline in the ground communication process for data transmission, and control information and service information of a satellite network are still not converted or unified with a 5G ground network, so that fusion of two networks cannot be achieved from a network management level.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for fusing a GEO satellite access network and a 5G core network, which can realize mutual transmission and mutual operation of control information and service data information of a satellite communication system and the 5G communication system, so that two technical systems are fused.
The technical scheme adopted by the invention for solving the technical problems is as follows: the improvement of the method for fusing the GEO satellite access network and the 5G core network is that the method comprises a user terminal, the satellite access network and the 5G core network, wherein the satellite access network comprises a satellite network control center and a gateway function conversion module which are connected;
the user terminal is respectively connected with the satellite network control center and the gateway function conversion module through a satellite link, and the gateway function conversion module is connected with the 5G core network; the method for fusing the GEO satellite access network and the 5G core network comprises the following steps:
s10, connecting the user terminal with the communication system, wherein the communication system is formed by fusing a satellite access network and a 5G core network, the user terminal initiates a connection request to the communication system through a gateway function conversion module, and the user terminal is accessed to the communication system after the connection is successful;
s20, converting user QoS service level information and managing QoS priority, wherein a 5G core network issues the user QoS service level information to a gateway function conversion module, the gateway function conversion module converts the user QoS service level information into satellite communication system control information, the satellite communication system control information enters a satellite network control center, and the QoS priority of the user using satellite communication link service is set through the satellite network control center;
s30, the gateway function conversion module synchronizes the distribution information of the satellite terminal and the 5G core network to the IP address, the gateway function conversion module synchronizes the IP address distributed to the user terminal by the satellite network control center to the 5G core network, and the unification of the IP address of the user terminal between the satellite access network and the 5G core network is ensured;
s40, establishing a session request, the user terminal initiates the session request, the gateway function conversion module converts the service request into 5G core network control information and transmits the control information to the 5G core network, and the 5G core network receives and establishes the service data transmission session connection.
Further, the gateway function conversion module includes an N1 interface protocol conversion unit, an N2 interface protocol conversion unit, and an N3 interface protocol conversion unit;
the 5G core network comprises an access and mobile management function module AMF and a user plane function module UPF, and the user terminal, the access and mobile management function module AMF are all connected to an N1 interface protocol conversion unit of a gateway function conversion module;
the N2 interface protocol conversion unit and the N3 interface protocol conversion unit are both connected to the satellite network control center, wherein the N2 interface protocol conversion unit is connected with the access and mobile management function module AMF, and the N3 interface protocol conversion unit is connected with the user plane function module UPF.
Furthermore, the 5G core network further includes an authentication server function module AUSF, a unified data management function module UDM, a network storage function module NRF, and a session management function module SMF;
the access and mobile management function module AMF is respectively connected with an authentication server function module AUSF, a unified data management function module UDM, a network storage function module NRF and a session management function module SMF, the authentication server function module AUSF and the unified data management function module UDM are connected with the network storage function module NRF, and the network storage function module NRF is connected with the session management function module SMF;
the user plane function module UPF is connected with the session management function module SMF, and the data network DN is connected with the user plane function module UPF.
Further, the step of performing protocol conversion by the N1 interface protocol conversion unit, the N2 interface protocol conversion unit, and the N3 interface protocol conversion unit includes:
s11, screening data, namely screening the content of the relevant information of each interface from the satellite link data packet by the N1 interface protocol conversion unit, the N2 interface protocol conversion unit and the N3 interface protocol conversion unit;
s12, mapping data, namely establishing a one-to-one mapping table for parts of the satellite access network and the 5G core network realizing the same function according to the format of a satellite network link data packet and the structure of a 5G core network module, wherein satellite network data of a satellite network control center can be converted into a protocol format of the corresponding function of the 5G core network according to the mapping relation;
and S13, data encapsulation and transmission, wherein the N1 interface protocol conversion unit, the N2 interface protocol conversion unit and the N3 interface protocol conversion unit encapsulate the converted data and transmit the encapsulated data to respective interfaces.
Further, step S10 includes the following steps:
s101, a user terminal adds user identity information into an identifier through a gateway function conversion module to form complete user information, and the gateway function conversion module adds the user information into a 5G core network to perform user identity authentication;
s102, after authenticating and authorizing the user identity, the 5G core network registers NAS information of a legal user terminal and authorizes an access communication system to enjoy communication service, and refuses to access the communication system for an illegal user terminal;
s103, after the connection is successful, managing the connection state through the gateway function conversion module, keeping the connection state, and not releasing the interface resources of the satellite access network and the N2 interface protocol conversion unit; when the user terminal initiates an offline request or instruction, the gateway function conversion module releases the interface resource of the N2 interface protocol conversion unit.
Further, in step S101, the user identity information includes the SUPI and the sui identifier, and the complete user information includes the user identity information and the satellite network identification number.
Further, the data to be filtered from the satellite link data packet includes: satellite beam number, satellite service data type, priority level, link delay budget, current link error rate, link maximum burst data capacity, user terminal identity information and authentication information, and satellite resource allocation condition obtained from a satellite network control center;
the mapping relation of the satellite network and the related data content of the 5G core network is as follows:
the satellite beam number is mapped into a 5G core network TrackingArea field through an interface of an N2 interface protocol conversion unit;
the satellite service data type, the priority level, the link delay budget, the current link error rate and the link maximum burst data capacity are mapped to a 5G core network QoS Profile through an interface of an N3 interface protocol conversion unit and are packaged into a 5G core network session management strategy unit as QoS flow parameters;
the identity information and the authentication information of the user terminal are encapsulated into fields of an ANDSP (access network digital signal processor) and a URSP (universal resource locator) of a user terminal strategy unit of the 5G core network through interface mapping of an N1 interface protocol conversion unit;
the satellite resource allocation condition is encapsulated into the fields of an access and mobile strategy unit SAR and RFSP of the 5G core network through the interface mapping of an N2 interface protocol conversion unit.
Further, in step S20, the 5G core network implements sending of the user QoS service class information according to the class of the user terminal.
Further, in step S40, the gateway function conversion module supports session and service continuity, and the IP address remains unchanged during a session lifetime.
Further, in step S40, the gateway function conversion module makes the satellite network control center consistent with the information of the 5G core network, so that the network administrator can synchronously perform network resource allocation or user management in the satellite access network and the 5G core network.
The invention has the beneficial effects that: the type, format, transmission mode and interaction mode of the control information and service information of the satellite communication system in the system are converted into the type, format, transmission mode and interaction mode of the control information and service information in the 5G communication system, so that the control information and service data information of the satellite communication system and the 5G communication system are mutually transmitted and mutually operated, and the two systems with different technical systems are fused.
Drawings
Fig. 1 is a schematic diagram of a 3GPP non-terrestrial network architecture in the prior art.
Fig. 2 to 5 are schematic diagrams of ITU satellite 5G fusion scenes in the prior art.
Fig. 6 is a schematic flow chart of a method for integrating a GEO satellite access network and a 5G core network according to the present invention.
Fig. 7 and 8 are diagrams illustrating an embodiment of a method for integrating a GEO satellite access network and a 5G core network according to the present invention.
Fig. 9 to 14 are specific application examples of a method for combining a GEO satellite access network and a 5G core network according to the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.
In order to facilitate understanding of the technical solutions of the present invention, the following terms are first explained in conjunction with the contents of the prior art:
GEO satellite: GEO, i.e., geostationary orbit (or "geostationary orbit", "geostationary satellite orbit"), refers specifically to a perfectly circular geostationary orbit of a satellite or satellite at an elevation of 35786 kilometers above the earth's equator. An observer on the earth surface can always observe the GEO satellite at the same position in the sky at any time, and can find that the satellite is still in the sky.
Access network: the access network is composed of a communication network node interface (such as a base station, a WiFi hotspot and the like) and a series of transmission links (such as wireless transmission links) between user and communication network node interfaces, and the user can access data to a telecommunication backbone core network through the access network by providing a transmission system with data transmission bearing capacity for the backbone network to supply telecommunication services to the user. There is in principle no restriction on the type and number of UNIs and SNIs that the access network can implement. The access network does not interpret the signaling.
Satellite beam: a beam refers to the shape of an electromagnetic wave emitted by a satellite antenna on the earth's surface (e.g., a light beam emitted to the dark by a flashlight). The satellite can emit a large number of beams like the earth.
A satellite main station: a ground station, referred to as a satellite network control center, is capable of managing and allocating satellite network resources and has the function of a gateway of a communication system.
QoS: quality of Service refers to a network that can provide better Service capability for specified network communications using various basic technologies, and is a technology for solving problems such as network delay and congestion. QoS guarantees are important for capacity-limited networks, especially for streaming multimedia applications such as VoIP and IPTV, which often require fixed transmission rates and are sensitive to delay. For a system with limited resources, a higher-priority QoS guarantee is generally set for a high-value user, and a lower-priority QoS guarantee is set for a common user, so as to differentiate services according to the payment condition.
User authentication: the user authentication is one kind of authentication of mobile phone information, including user state authentication and user personalized authentication, and is mainly used for identifying legal users and refusing illegal users to access the network.
Authentication: refers to verifying that the user has the right to access the system. Traditional authentication is verified by means of a password.
AMF: the access and mobility management function module is a main function unit of a 5G core network, completes access and mobility management of a terminal user, and is equivalent to a part of functions of a Mobility Management Entity (MME).
NAS: the NAS protocol handles the transmission of information between the user terminal and the core network, and the transmitted content may be user information or control information (such as service establishment, release or mobility management information).
SMF: and the session management function module is mainly responsible for interacting with a separated data plane, creating, updating and deleting a PDU session, and managing a session context (session context) with UPF (user plane function).
Referring to fig. 6, 7 and 8, the present invention discloses a method for fusing a GEO satellite access network and a 5G core network, where the method needs to be implemented by depending on a device, and as shown in fig. 7, in this embodiment, the device includes a user terminal 10, a satellite access network 20 and a 5G core network 30, and the satellite access network 20 includes a satellite network control center 201 and a gateway function conversion module 202 connected to each other; the user terminal 10 is respectively connected with the satellite network control center 201 and the gateway function conversion module 202 through a satellite link, and the gateway function conversion module 202 is connected with the 5G core network 30; it is understood that the user terminal 10 is connected to a satellite main station through a satellite, the satellite main station includes a satellite network control center 201, and the satellite main station is connected to the 5G core network 30 through a gateway function conversion module 202.
Fig. 8 is a schematic diagram of a detailed structure of the device, in which a satellite network control center 201(NCC, network control center) is a satellite master station installed with a network management system; the UE refers to the user terminal 10, the DN refers to the data network, the Gateway Function conversion module 202 is an Adaptive Gateway Function (AGF), in this embodiment, the Gateway Function conversion module 202 includes an N1 interface protocol conversion unit, an N2 interface protocol conversion unit, and an N3 interface protocol conversion unit, and the user terminal 10 directly passes through the satellite network control center NCC, which indicates that the satellite network control center NCC does not process interface information of the N1 interface protocol conversion unit. Further, referring to fig. 8, the 5G core network includes an access and mobility management function module AMF and a user plane function module UPF, and the user terminal, the access and mobility management function module AMF are all connected to an N1 interface protocol conversion unit of the gateway function conversion module; the N2 interface protocol conversion unit and the N3 interface protocol conversion unit are both connected to the satellite network control center, wherein the N2 interface protocol conversion unit is connected with the access and mobile management function module AMF, and the N3 interface protocol conversion unit is connected with the user plane function module UPF.
In addition, the 5G core network also comprises an authentication server function module AUSF, a unified data management function module UDM, a network storage function module NRF and a session management function module SMF, wherein the authentication server function module AUSF and the unified data management function module UDM are combined into the same module; the connection relationship is as follows: the access and mobile management function module AMF is respectively connected with an authentication server function module AUSF, a unified data management function module UDM, a network storage function module NRF and a session management function module SMF, the authentication server function module AUSF and the unified data management function module UDM are connected with the network storage function module NRF, and the network storage function module NRF is connected with the session management function module SMF; the user plane function module UPF is connected with the session management function module SMF, and the data network DN is connected with the user plane function module UPF.
Based on the above connection relationship, the step of performing protocol conversion by the N1 interface protocol conversion unit, the N2 interface protocol conversion unit, and the N3 interface protocol conversion unit includes:
s11, screening data, namely screening the content of the relevant information of each interface from the satellite link data packet by the N1 interface protocol conversion unit, the N2 interface protocol conversion unit and the N3 interface protocol conversion unit;
s12, mapping data, namely establishing a one-to-one mapping table for parts of the satellite access network and the 5G core network realizing the same function according to the format of a satellite network link data packet and the structure of a 5G core network module, wherein satellite network data of a satellite network control center can be converted into a protocol format of the corresponding function of the 5G core network according to the mapping relation;
and S13, data encapsulation and transmission, wherein the N1 interface protocol conversion unit, the N2 interface protocol conversion unit and the N3 interface protocol conversion unit encapsulate the converted data and transmit the encapsulated data to respective interfaces.
The data to be screened from the satellite link data packet includes: satellite beam number, satellite service data type (classified as delay sensitive and delay insensitive), priority level, link delay budget, current link error rate, link maximum burst data capacity, user terminal identity information and authentication information, and satellite resource (such as carrier, bandwidth and power) allocation acquired from a satellite network control center.
The mapping relation of the satellite network and the related data content of the 5G core network is as follows: the satellite beam number is mapped into a 5G core network TrackingArea field (through an interface of an N2 interface protocol conversion unit); the satellite service data type (which is divided into delay sensitivity and delay insensitivity), the priority level, the link delay budget, the current link error rate and the link maximum burst data capacity are mapped to the 5G core network QoS Profile together and are encapsulated into a 5G core network session management Policy (SM Policy) unit (an interface of an N3 interface protocol conversion unit) as QoS flow parameters; the user terminal identity information and the authentication information are mapped and encapsulated into a 5G core network user terminal policy (UE policy) unit ANDSP and a URSP field (an interface of an N1 interface protocol conversion unit); satellite resource (carrier, bandwidth, power) allocation maps access and mobility Policy (AM Policy) unit SAR and RFSP fields (interface to protocol conversion unit via N2 interface) encapsulated into the 5G core network.
Referring to fig. 6, the method for integrating the GEO satellite access network 20 and the 5G core network 30 includes the following steps:
s10, connecting the user terminal 10 with the communication system, the communication system is formed by fusing the satellite access network 20 and the 5G core network 30, the user terminal 10 initiates a connection request to the communication system through the gateway function conversion module 202, and the connection request is used for accessing the communication system after the connection is successful;
in this embodiment, step S10 includes the following steps:
s101, the user terminal 10 adds the user identity information into the identification through the gateway function conversion module 202 to form complete user information, and the gateway function conversion module 202 adds the user information into the 5G core network 30 to perform user identity authentication; in this step, the user identity information includes SUPI and sui identifiers, and the complete user information includes the user identity information and the satellite network identification number.
S102, after the user identity is authenticated and authenticated by the 5G core network 30, the NAS information of the legal user terminal 10 is registered, the communication system is authorized to be accessed to enjoy the communication service, and the communication system is refused to be accessed to the illegal user terminal 10;
s103, after the connection is successful, managing the connection state through the gateway function conversion module, keeping the connection state, and not releasing the interface resources of the satellite access network and the N2 interface protocol conversion unit; when the user terminal initiates an offline request or instruction, the gateway function conversion module releases the interface resource of the N2 interface protocol conversion unit.
S20, converting user QoS service level information and managing QoS priority, wherein the 5G core network 30 issues the user QoS service level information to the gateway function conversion module 202, the gateway function conversion module 202 converts the user QoS service level information into satellite communication system control information, the satellite communication system control information enters the satellite network control center 201, and the QoS priority of the user using satellite communication link service is set through the satellite network control center 201; in step S20, the 5G core network 30 implements the issue of the user QoS service level information according to the level of the user terminal 10;
s30, the gateway function conversion module 202 synchronizes the distribution information of the satellite terminal and the 5G core network 30 to the IP address, and the gateway function conversion module synchronizes the IP address distributed by the satellite network control center 201 to the user terminal 10 to the 5G core network 30, so as to ensure the unification of the IP address of the user terminal 10 in the satellite access network 20 and the 5G core network 30;
s40, establishing the session request, the user terminal 10 initiates the session request, the gateway function conversion module 202 converts the service request into control information of the 5G core network 30 and transmits the control information to the 5G core network 30, and the 5G core network 30 receives and establishes the service data transmission session connection. In step S40, the gateway function conversion module 202 supports session and service continuity, and the IP address remains unchanged during a session lifetime. In step S40, the gateway function conversion module 202 makes the information of the satellite network control center 201 and the 5G core network 30 consistent, so that the network administrator can synchronously perform network resource allocation or user management in the satellite access network 20 and the 5G core network 30.
In addition, during network operation, such as failure and error of the satellite network control center 201, the gateway function conversion module 202 supports power-on or restart of the satellite network control center 201 connected to the N2 interface conversion unit, and error information prompt. Meanwhile, for the situation that the user changes the location due to movement and another satellite master station takes over the service, the gateway function conversion module 202 supports switching between different satellite master stations connected to the same gateway function conversion module 202, and also supports switching of the interface of the N2 interface protocol conversion unit in the gateway function conversion module 202 between different satellite master stations.
When a user or a network wishes to end a service and issues a logoff request or instruction, the gateway function conversion module 202 supports PDU (packet data unit) session release initiated by a user side or a network side and supports NAS de-registration information initiated by the user side or the network side. The gateway function conversion module 202 will initiate the release procedure actively, and inform the 5G core network 30 to release the relevant resources.
According to the invention, the type, format, transmission mode and interaction mode of the control information and service information of the satellite communication system in the system are converted into the type, format, transmission mode and interaction mode of the control information and service information in the 5G communication system, so that the control information and service data information of the satellite communication system and the 5G communication system are mutually transmitted and mutually operated, and the systems of two different technical systems are fused. By adopting the method, the satellite is not changed, the manufacturing cost of the satellite is not increased, and the existing satellite can be used; meanwhile, the gateway function conversion module 202 can realize unification of control information and service data information in the satellite communication system and the 5G communication system, and realize mutual communication and mutual operation.
The invention enables the satellite communication system to use the 5G network standard to complete the user identity authentication, authentication and registration, QoS authorization grading information is mutually transmitted between the satellite access network 20 and the 5G core network 30, IP address is uniformly distributed between the satellite access network 20 and the 5G core network 30, the network management system information of the satellite network control center 201 and the 5G core network 30 is uniform, and the session service is initiated between the satellite access network 20 and the 5G core network 30 to establish, mutually transmit and release connection and the like. Therefore, the satellite access network 20 and the 5G core network 30 can communicate and interoperate with each other, and a set of communication system is integrated.
The invention can be applied to four different application scenes of the micro communication access network, and the system interface design of the fusion satellite access network 20 and the 5G core network 30 in different scenes is shown in figures 9 to 14.
Referring to fig. 9, the scenario is a cross-beam communication scenario in which, under the service of a network management system of a satellite and a set of satellite master stations, any two user terminals 10 communicate in the same beam or two users communicate in different beams in any two beams of the satellite.
Referring to fig. 10 and 11, this scenario is a cross-beam communication scenario in which, under the service of a network management system of one satellite and a plurality of different satellite master stations, any two user terminals 10 communicate in the same beam in any two beams of the satellite, or two user terminals 10 communicate in different beams.
Referring to fig. 12, in this scenario, any two beams belong to any two different satellites, and are served by the network management system of one satellite master station, and any two user terminals 10 communicate in the same beam or two user terminals 10 communicate in a cross-beam communication scenario with different beams.
Referring to fig. 13 and 14, in this scenario, any two beams belong to any two different satellites, and are served by any two different satellite master station network management systems, and any two user terminals 10 communicate in the same beam or two users communicate in a cross-beam communication scenario with different beams.
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 (7)

1. A method for fusing a GEO satellite access network and a 5G core network is characterized by comprising a user terminal, a satellite access network and the 5G core network, wherein the satellite access network comprises a satellite network control center and a gateway function conversion module which are connected;
the user terminal is respectively connected with the satellite network control center and the gateway function conversion module through a satellite link, and the gateway function conversion module is connected with the 5G core network;
the gateway function conversion module comprises an N1 interface protocol conversion unit, an N2 interface protocol conversion unit and an N3 interface protocol conversion unit; the 5G core network comprises an access and mobile management function module AMF and a user plane function module UPF, and the user terminal, the access and mobile management function module AMF are all connected to an N1 interface protocol conversion unit of a gateway function conversion module; the N2 interface protocol conversion unit and the N3 interface protocol conversion unit are both connected to a satellite network control center, wherein the N2 interface protocol conversion unit is connected with an access and mobile management function module AMF, and the N3 interface protocol conversion unit is connected with a user plane function module UPF;
the step of protocol conversion by the N1 interface protocol conversion unit, the N2 interface protocol conversion unit and the N3 interface protocol conversion unit includes:
s11, screening data, namely screening the content of the relevant information of each interface from the satellite link data packet by the N1 interface protocol conversion unit, the N2 interface protocol conversion unit and the N3 interface protocol conversion unit;
s12, mapping data, namely establishing a one-to-one mapping table for parts of the satellite access network and the 5G core network realizing the same function according to the format of a satellite network link data packet and the structure of a 5G core network module, wherein satellite network data of a satellite network control center can be converted into a protocol format of the corresponding function of the 5G core network according to the mapping relation;
s13, data encapsulation and transmission, wherein the N1 interface protocol conversion unit, the N2 interface protocol conversion unit and the N3 interface protocol conversion unit encapsulate the converted data and transmit the encapsulated data to respective interfaces;
the 5G core network also comprises an authentication server function module AUSF, a unified data management function module UDM, a network storage function module NRF and a session management function module SMF; the access and mobile management function module AMF is respectively connected with an authentication server function module AUSF, a unified data management function module UDM, a network storage function module NRF and a session management function module SMF, the authentication server function module AUSF and the unified data management function module UDM are connected with the network storage function module NRF, and the network storage function module NRF is connected with the session management function module SMF; the user plane function module UPF is connected with the session management function module SMF, and the data network DN is connected with the user plane function module UPF;
the method for fusing the GEO satellite access network and the 5G core network comprises the following steps:
s10, connecting the user terminal with the communication system, wherein the communication system is formed by fusing a satellite access network and a 5G core network, the user terminal initiates a connection request to the communication system through a gateway function conversion module, and the user terminal is accessed to the communication system after the connection is successful;
s20, converting user QoS service level information and managing QoS priority, wherein a 5G core network issues the user QoS service level information to a gateway function conversion module, the gateway function conversion module converts the user QoS service level information into satellite communication system control information, the satellite communication system control information enters a satellite network control center, and the QoS priority of the user using satellite communication link service is set through the satellite network control center;
s30, the gateway function conversion module synchronizes the distribution information of the satellite terminal and the 5G core network to the IP address, the gateway function conversion module synchronizes the IP address distributed to the user terminal by the satellite network control center to the 5G core network, and the unification of the IP address of the user terminal between the satellite access network and the 5G core network is ensured;
s40, establishing a session request, the user terminal initiates the session request, the gateway function conversion module converts the service request into 5G core network control information and transmits the control information to the 5G core network, and the 5G core network receives and establishes the service data transmission session connection.
2. The method for fusing a GEO satellite access network and a 5G core network according to claim 1, wherein the step S10 includes the following steps:
s101, a user terminal adds user identity information into an identifier through a gateway function conversion module to form complete user information, and the gateway function conversion module adds the user information into a 5G core network to perform user identity authentication;
s102, after authenticating and authorizing the user identity, the 5G core network registers NAS information of a legal user terminal and authorizes an access communication system to enjoy communication service, and refuses to access the communication system for an illegal user terminal;
s103, after the connection is successful, managing the connection state through the gateway function conversion module, keeping the connection state, and not releasing the interface resources of the satellite access network and the N2 interface protocol conversion unit; when the user terminal initiates an offline request or instruction, the gateway function conversion module releases the interface resource of the N2 interface protocol conversion unit.
3. The method of claim 2, wherein in step S101, the user identity information includes SUPI and sui identifiers, and the complete user information includes the user identity information and the satellite network identification number.
4. The method of claim 1, wherein the data to be filtered from the satellite link data packet comprises: satellite beam number, satellite service data type, priority level, link delay budget, current link error rate, link maximum burst data capacity, user terminal identity information and authentication information, and satellite resource allocation condition obtained from a satellite network control center;
the mapping relation of the satellite network and the related data content of the 5G core network is as follows:
the satellite beam number is mapped into a 5G core network TrackingArea field through an interface of an N2 interface protocol conversion unit;
the satellite service data type, the priority level, the link delay budget, the current link error rate and the link maximum burst data capacity are mapped to a 5G core network QoS Profile through an interface of an N3 interface protocol conversion unit and are packaged into a 5G core network session management strategy unit as QoS flow parameters;
the identity information and the authentication information of the user terminal are encapsulated into fields of an ANDSP (access network digital signal processor) and a URSP (universal resource locator) of a user terminal strategy unit of the 5G core network through interface mapping of an N1 interface protocol conversion unit;
the satellite resource allocation condition is encapsulated into the fields of an access and mobile strategy unit SAR and RFSP of the 5G core network through the interface mapping of an N2 interface protocol conversion unit.
5. The method for fusing the GEO satellite access network and the 5G core network according to claim 1, wherein in step S20, the 5G core network implements the issue of user QoS service level information according to the level of the user terminal.
6. The method for fusing a GEO satellite access network and a 5G core network according to claim 1, wherein in step S40, the gateway function conversion module supports session and service continuity, and the IP address remains unchanged during a session lifetime.
7. The method of claim 1, wherein in step S40, the gateway function conversion module makes information of the satellite network control center and the 5G core network consistent, so that network administrator can synchronously perform network resource allocation or user management in the satellite access network and the 5G core network.
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