A mobility management method, module and system for space-ground cooperative network

Abstract

The application provides a mobility management method, module and system of a space-ground cooperative network. The method comprises the following steps: step 1: before a satellite switching occurs, an announcement carrying satellite switching information is sent to a space-based core network, so that the space-based core network establishes a new space-based slice channel; the satellite switching information comprises original satellite information responsible for space-ground communication and new satellite information to be switched; step 2: after the new space-based slice channel is established, an announcement carrying current ground-based slice channel information is sent to the space-based core network, so that the space-based core network establishes a new space-ground link based on the new satellite to establish communication between the new space-based slice channel and the current ground-based slice channel; and step 3: a related mapping relationship between the ground-based slice channel and the original satellite maintained locally is updated to a related mapping relationship between the ground-based slice channel and the new satellite.

Description

Technical Field

[0001] This invention relates to the field of novel network architecture technology, and in particular to a mobility management method, module, and system for a space-ground collaborative network. Background Technology

[0002] The space-ground collaborative wide-area communication network is a new network architecture for the future. It addresses the contradiction of huge investment and unsustainability in achieving wide-area coverage of mobile communication networks based on traditional terrestrial cellular networks. It complements the advantages of satellite wide coverage and terrestrial strong coverage, gets rid of the limitations of independent development, and forms a space-ground collaborative network system that is "accessible wherever you go, provides services on demand, and is secure and reliable".

[0003] The space-ground integrated network provides 5G services to users through the collaboration of a terrestrial network and a space-based network. The terrestrial component is the 5G mobile communication network, and the space-based component is the satellite network. Users connect to the data network via the 5G mobile communication network-satellite network. In this network architecture, mobility in the space-ground integrated network includes both UE (User Equipment) movement and satellite movement. Clearly, UE movement affects not only the terrestrial 5G mobile communication network but also the satellite network. Existing UE mobility management methods used in 5G mobile communication networks are not suitable for the space-ground integrated network; similarly, traditional satellite mobility management methods are not entirely applicable. Therefore, proposing a mobility management method adapted to the space-ground integrated network, shielding it from the impacts of UE and satellite movement, is a crucial problem that must be solved. Summary of the Invention

[0004] To address the problem that existing UE mobility management methods used in 5G mobile communication networks or satellite mobility management methods used in traditional satellite networks are not suitable for space-ground collaborative networks, this invention provides a mobility management method, module, and system for space-ground collaborative networks.

[0005] In a first aspect, the present invention provides a mobility management method for a space-ground coordinated network, comprising: Step 1: Before the satellite handover is about to occur, send a notification carrying satellite handover information to the space-based core network so that the space-based core network can establish a new space-based slice channel; the satellite handover information includes the original satellite information responsible for space-to-ground communication and the information of the new satellite to be switched to; Step 2: After the new space-based slice channel is established, a notification carrying the current ground-based slice channel information is sent to the space-based core network so that the space-based core network can establish a new space-to-ground link based on the new satellite to establish communication between the new space-based slice channel and the current ground-based slice channel. Step 3: Update the mapping relationship between the locally maintained ground-based slice channel and the original satellite to the mapping relationship between the ground-based slice channel and the new satellite.

[0006] Furthermore, in step 1, the space-based core network establishes new space-based slicing channels, specifically including: S-AMF selects a new S-SMF and establishes an association with that new S-SMF; The new S-SMF selects a new S-UPF based on the new satellite and establishes an N4 session channel with the new S-UPF. At this point, the new space-based slicing channel is established.

[0007] Furthermore, it also includes: after the space-based core network completes the establishment of a new space-based slice channel, it returns a notification carrying information that the new space-based slice channel has been established.

[0008] Furthermore, it also includes: after the local base-based slice channel communicates with the new space-based slice channel, removing the original space-based slice channel to reclaim the original S-SMF and original S-UPF resources.

[0009] Secondly, the present invention provides a mobility management method for a space-ground coordinated network, comprising: Step 1: Deploy a switching gateway in advance after the ground-based UPF anchor point of the satellite communication base station; Step 2: After the UE accesses the satellite communication base station, query the existing mapping relationship for the tag of the space-based network corresponding to the UE and the global IP address of the access data network; Step 3: If no match is found, assign a space-based network tag and a global IP address for accessing the data network to the UE; Step 4: Send the space-based tag corresponding to the UE to the conversion gateway corresponding to the satellite communication base station; Step 5: Send the space-based tag and global IP address corresponding to the UE to the satellite UPF anchor point corresponding to the satellite communication base station; Step 6: The UE's service data is transmitted to the conversion gateway via the ground-based UPF anchor point of the satellite communication base station. The conversion gateway maps the source address of the service data from a LAN-type IP address to the space-based label corresponding to the UE, and forwards the service data to the satellite UPF anchor point. The satellite UPF anchor point maps the source address of the service data from the space-based label to the global IP address corresponding to the UE, and sends the service data to the data network.

[0010] Furthermore, it also includes: if the tag of the space-based network corresponding to the UE and the global IP address of the access data network are found, and the original satellite UPF anchor point has not been moved, then after step 2, steps 4 and 6 are executed directly.

[0011] Furthermore, it also includes: if the tag of the space-based network corresponding to the UE and the global IP address of the access data network are found, but the original satellite UPF anchor point has been moved, then after step 2, steps 4 to 6 are executed directly.

[0012] Thirdly, the present invention provides a space-based mobility management module for a space-ground collaborative network, comprising: The first management unit is used to send a notification carrying satellite switching information to the space-based core network before a satellite switchover is about to occur, so that the space-based core network can establish a new space-based slice channel; the satellite switching information includes the original satellite information responsible for space-to-ground communication and the information of the new satellite to be switched over; In addition, after the new space-based slicing channel is established, a notification carrying the current ground-based slicing channel information is sent to the space-based core network so that the space-based core network can establish a new space-to-ground link based on the new satellite to establish communication between the new space-based slicing channel and the current ground-based slicing channel. The first mapping relationship storage unit is used to maintain the relevant mapping relationship between the ground-based slice channel and the satellite.

[0013] Fourthly, the present invention provides a ground-based mobility management module for a space-ground collaborative network, comprising: The conversion gateway is set after the ground-based UPF anchor point of the satellite communication base station. When the UE's service data arrives at the conversion gateway, it maps the source address of the service data from an IP address of type LAN to the space-based tag corresponding to the UE. The second management unit is used to query the existing mapping relationship for the space-based network tag and the global IP address for accessing the data network corresponding to the UE after the UE accesses the satellite communication base station; if not found, it assigns a space-based network tag and a global IP address for accessing the data network to the UE; sends the space-based tag corresponding to the UE to the conversion gateway corresponding to the satellite communication base station; sends the space-based tag and global IP address corresponding to the UE to the satellite UPF anchor point corresponding to the satellite communication base station; and sends the UE's service data to the conversion gateway via the ground-based UPF anchor point of the satellite communication base station, so that the conversion gateway can map the source address of the service data from the IP address of type LAN to the space-based tag corresponding to the UE, and forward the service data to the satellite UPF anchor point, so that the satellite UPF anchor point can map the source address of the service data from the space-based tag to the global IP address corresponding to the UE, and send the service data to the data network. The second mapping relationship storage unit is used to maintain the mapping relationship between the UE, the tag of the space-based network, and the global IP address of the access data network.

[0014] Fifthly, the present invention provides a mobility management system for a space-ground collaborative network, including the aforementioned space-based mobility management module and / or the aforementioned ground-based mobility management module.

[0015] The beneficial effects of this invention are: (1) In response to satellite movement events, the space-based mobility management module can notify the space-based core network in advance to deploy new slice channels before a satellite handover occurs, thereby realizing satellite mobility management.

[0016] (2) For UE mobility events, the ground mobility management module manages the network identifiers used by the ground and space networks in a unified manner, and realizes the coordinated allocation and mapping of network identifiers; at the same time, a conversion gateway is deployed after the ground UPF anchor point of the satellite communication base station STB. The conversion gateway is managed by the ground mobility management module and performs the identifier conversion operation; ultimately, UE mobility management can be realized.

[0017] (3) By deploying a space-ground coordinated mobility management system between the ground-based network and the space-based network in the space-ground coordinated network, the coordination between the ground-based network and the space-based network can be realized, and satellite mobility events and UE mobility events can be processed to ensure the continuity of services or sessions.

[0018] (4) The method of the present invention is adapted to the mobility management of the space-ground collaborative network, and shields the impact of the movement of the UE and the movement of the satellite. Attached Figure Description

[0019] Figure 1 One of the flowcharts of a mobility management method for a space-ground collaborative network provided in an embodiment of the present invention; Figure 2 This is a second flowchart illustrating a mobility management method for a space-ground collaborative network provided in an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] Example 1 like Figure 1As shown, it is assumed that a slice channel has been established from the UE to the data network, which consists of three parts: a ground-based slice channel, a satellite-to-ground link, and a space-based slice channel. The ground-based slice channel is deployed in a ground-based UPF, and the space-based slice channel is deployed in a space-based original S-UPF, carried by the satellite currently responsible for satellite-to-ground communication (let's call this satellite A).

[0022] At this point, due to the dynamic movement of the satellite, a satellite switch is imminent, and the new satellite responsible for satellite-to-ground communication services will be identified as Satellite B.

[0023] Based on this situation, embodiments of the present invention provide a mobility management method for a space-ground coordinated network, comprising the following steps: S101: Before a satellite handover occurs, the existing space-based slice channel remains unchanged. The space-based mobility management module sends a notification (referred to as the first notification) carrying satellite handover information to the S-AMF of the space-based core network. The satellite handover information includes the original satellite information responsible for space-to-ground communication and the information of the new satellite to be switched to. Specifically, the purpose of this notice is to inform the space-based core network that a satellite switch will be required, and the satellite for space-to-ground communication will be switched from satellite A to satellite B, requiring the space-based core network to establish a new space-based slicing channel.

[0024] S102: After receiving the first notification, the S-AMF of the space-based core network begins to establish a new space-based slice channel; Specifically, the process of establishing a new space-based slice channel in the space-based core network includes: the S-AMF selects a new S-SMF and establishes an association with the new S-SMF; the new S-SMF selects a new S-UPF based on the new satellite (i.e., satellite B) and establishes an N4 session channel with the new S-UPF. At this point, the establishment of the new space-based slice channel is completed.

[0025] S103: Once a new space-based slice channel is established, the space-based core network S-AMF returns a notification to the space-based mobility management module, carrying information that the new space-based slice channel has been established, to notify that the new space-based slice channel has been established. It should be noted that the space-based mobility management module can also query the space-based core network to see if a new space-based slice channel has been established.

[0026] S104: After the new space-based slice channel is established, a notification (referred to as the second notification) carrying the current ground-based slice channel information is sent to the space-based core network to notify the space-based core network to execute the channel switching procedure.

[0027] S105: After receiving the second notification, the S-AMF of the space-based core network establishes a new space-to-ground link based on the new satellite (i.e., establishes a link between the new S-UPF and the ground-based UPF) to establish communication between the new space-based slice channel and the current ground-based slice channel. S106: Update the local mapping relationship between the ground-based slice channel and the original satellite to the mapping relationship between the ground-based slice channel and the new satellite.

[0028] Specifically, in the space-based mobility management module, before satellite switching, the mapping relationship between the ground-based slice channel and the original satellite is represented as "current ground-based slice channel - satellite-ground link based on satellite A - space-based slice channel based on satellite A". After satellite switching, the mapping relationship between the updated ground-based slice channel and the new satellite is represented as "original ground-based slice channel - satellite-ground link based on satellite B - space-based slice channel based on satellite B".

[0029] S107: After the ground-based slice channel communicates with the new space-based slice channel, the original space-based slice channel is removed to reclaim the original S-SMF and original S-UPF resources.

[0030] At this point, the UE's handover to the new space-based slice channel of the data network is complete.

[0031] It should be noted that, due to the numerous details in the core network processing procedure, the core network processing procedure has been simplified in the description provided in the embodiments of the present invention. Only the important parts involved in the improvements of the present invention are described, and other details not described still refer to the 5G standard.

[0032] Example 2 like Figure 2 As shown, this embodiment of the invention provides a mobility management method for a space-ground coordinated network. Assuming the UE is accessing the space-ground coordinated network for the first time, the method includes the following steps: S201: Deploy a switching gateway in advance after the ground-based UPF anchor point of the satellite communication base station; S202: After the UE accesses the ground-based UPF anchor point through the next-generation base station (gNB1) of the satellite communication base station (STB1), query the tag of the space-based network corresponding to the UE and the global IP address of the access data network in the existing mapping relationship. Specifically, after the UE connects to the ground-based UPF anchor point, it will obtain an IP address of type LAN. For ease of description, this IP address will be referred to as IP1.

[0033] S203: Since this is the first time the UE has accessed the space-ground integrated network, it cannot be found in the existing mapping relationship. At this time, a space-based network label (denoted as space-based label A) and a global IP address for accessing the data network are assigned to the UE.

[0034] Specifically, a global IP address refers to an IP address of type global, which is denoted as IP(global) for ease of description. S204: Send the space-based label corresponding to the UE to the conversion gateway corresponding to the satellite communication base station; S205: Send the space-based tag and global IP address corresponding to the UE to the satellite UPF anchor point corresponding to the satellite communication base station; S206: The UE's service data is transmitted to the conversion gateway via the ground-based UPF anchor point of the satellite communication base station; S207: After the message arrives at the conversion gateway, the conversion gateway maps the source address of the service data from IP1 to space-based label A in order to forward the service data to the satellite UPF anchor point; Specifically, when the UE's service data is output from the ground-based UPF anchor point of STB1, no NAT (Network Address Translation) processing is performed, that is, the source address of the output packet is IP1.

[0035] S208: After the message arrives at the satellite UPF anchor point, the satellite UPF anchor point maps the source address of the service data from the space-based label A to IP (global) in order to send the service data to the data network.

[0036] Example 3 Based on the above embodiment 2, due to the movement of the UE, when the UE moves to the gNB2 access of STB2, this embodiment of the invention provides a mobility management method for a space-air-ground cooperative network, specifically including the following: S301: When the UE switches from satellite communication base station STB1 to satellite communication base station STB2, the UE obtains a new IP address of type LAN, denoted as IP2; S302: Since the UE has previously accessed the space-ground collaborative network and has been assigned a space-ground network label and a global IP address, the corresponding space-ground label A and IP (global) of the UE can be found in the existing mapping relationship; S303: Since the ground-based UPF anchor point of the UE has changed, it is necessary to send the ground tag A to the conversion gateway corresponding to STB2; assuming that no satellite movement event has occurred at the original satellite UPF anchor point of the UE, since the ground tag A and IP (global) of the UE were already sent to the original satellite UPF anchor point during the first access, it is not necessary to send the ground tag A and IP (global) of the UE to the satellite UPF anchor point again.

[0037] S304: This step is the same as steps S206 to S208 in Example 2, and will not be repeated here.

[0038] Example 4 Based on the above embodiment 3, assuming that a satellite movement event occurs at the original satellite UPF anchor point accessed by the UE, this embodiment of the invention provides a mobility management method for a space-ground collaborative network, specifically including the following: S401: When the UE switches from satellite communication base station STB1 to satellite communication base station STB2, the UE obtains a new IP address of type LAN, denoted as IP2; S402: Since the UE has previously accessed the space-ground collaborative network and has been assigned a space-ground network label and a global IP address, the corresponding space-ground label A and IP (global) of the UE can be found in the existing mapping relationship; S403: Since the ground-based UPF anchor point of the UE access has changed, it is necessary to send the ground tag A to the conversion gateway corresponding to STB2. S404: Because a satellite movement event has occurred at the original satellite UPF anchor point accessed by the UE, it is necessary to resend the UE's corresponding ground tag A and IP (global) to the new satellite UPF anchor point; Specifically, the satellite switching process can refer to the method in Example 1 to switch the ground-based slice channel connected to the original satellite UPF anchor point to the new satellite UPF anchor point, which will not be described in detail here.

[0039] S405: This step is the same as steps S206 to S208 in Example 2, and will not be repeated here.

[0040] Example 5 This invention provides a space-based mobility management module for a space-ground collaborative network, comprising: a first management unit and a first mapping relationship storage unit; The first management unit is used to send a notification carrying satellite switching information to the space-based core network before a satellite switchover is about to occur, so that the space-based core network can establish a new space-based slice channel; the satellite switching information includes the original satellite information responsible for space-to-ground communication and the information of the new satellite to be switched over; And it is used to send a notification carrying the current ground-based slice channel information to the space-based core network after the new space-based slice channel is established, so that the space-based core network can establish a new satellite-to-ground link based on the new satellite to establish communication between the new space-based slice channel and the current ground-based slice channel. The first mapping relationship storage unit is used to maintain the relevant mapping relationship between the ground-based slice channel and the satellite.

[0041] It should be noted that the space-based mobility management module provided in this embodiment of the invention is for implementing the above method embodiment 1. Its specific workflow can be referred to the above method embodiment, and will not be repeated here.

[0042] Example 6 This invention provides a ground-based mobility management module for a space-ground collaborative network, including a conversion gateway, a second management unit, and a second mapping relationship storage unit; The conversion gateway, located after the ground-based UPF anchor point of the satellite communication base station, is used to map the source address of the UE's service data from a LAN-type IP address to the UE's corresponding space-based tag when the UE's service data arrives at the conversion gateway. The second management unit is used to query the existing mapping relationship for the UE's corresponding space-based network tag and access data network global IP address after the UE accesses the satellite communication base station; if not found, it assigns a space-based network tag and access data network global IP address to the UE; sends the UE's corresponding space-based tag to the conversion gateway corresponding to the satellite communication base station; sends the UE's corresponding space-based tag and global IP address to the satellite UPF anchor point corresponding to the satellite communication base station; and sends the UE's service data to the conversion gateway via the ground-based UPF anchor point of the satellite communication base station, so that the conversion gateway can map the source address of the service data from a LAN-type IP address to the UE's corresponding space-based tag, and forward the service data to the satellite UPF anchor point, so that the satellite UPF anchor point can map the source address of the service data from the space-based tag to the UE's corresponding global IP address, and send the service data to the data network. The second mapping relationship storage unit is used to maintain the mapping relationship between the UE, the tag of the space-based network, and the global IP address of the access data network.

[0043] It should be noted that the ground mobility management module provided in this embodiment of the invention is for implementing the above-described method embodiments 2, 3 and 4. Its specific workflow can be referred to the above-described method embodiments, and will not be repeated here.

[0044] Example 7 As one possible implementation, this embodiment of the invention provides a mobility management system for a space-ground collaborative network, including the space-based mobility management module in embodiment 5 above.

[0045] As one possible implementation, this embodiment of the invention provides a mobility management system for a space-ground collaborative network, including the ground-based mobility management module in embodiment 6 above.

[0046] As one possible implementation, this invention provides a mobility management system for a space-ground collaborative network, including the space-based mobility management module in embodiment 5 and the ground-based mobility management module in embodiment 6.

[0047] In response to satellite mobility events, the space-based mobility management module will notify the space-based core network in advance to deploy a new slice channel before a satellite handover is about to occur. This slice channel is built on a new satellite serving the space-to-ground link. Then, the satellite handover process will be executed to connect the new space-based slice channel with the original ground-based slice channel. The space-based core network will be notified to remove the original space-based slice channel and reclaim the relevant resources.

[0048] In response to UE mobility events, the ground-based mobility management module uniformly manages the network identifiers used by ground-based and space-based networks, and realizes the coordinated allocation and mapping of network identifiers. These network identifiers include the label of the space-based network and the global IP address for accessing the data network. At the same time, a conversion gateway is deployed after the ground-based UPF anchor point of the satellite communication base station STB. The conversion gateway is managed by the ground-based mobility management module and performs the identifier conversion operation.

[0049] By deploying the space-ground collaborative mobility management system of this invention between the ground-based network and the space-based network in the space-ground collaborative network, the collaboration between the ground-based network and the space-based network can be realized to process satellite mobility events and UE mobility events, so as to ensure the continuity of services or sessions.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mobility management method for a space-ground collaborative network, characterized in that, include: The space-based mobility management module performs the following steps: Step 1: Before the satellite handover is about to occur, send a notification carrying satellite handover information to the space-based core network so that the space-based core network can establish a new space-based slice channel; the satellite handover information includes the original satellite information responsible for space-to-ground communication and the information of the new satellite to be switched to; Step 2: After the new space-based slice channel is established, a notification carrying the current ground-based slice channel information is sent to the space-based core network so that the space-based core network can establish a new space-to-ground link based on the new satellite to establish communication between the new space-based slice channel and the current ground-based slice channel. Step 3: Update the local mapping relationship between the ground-based slice channel and the original satellite to the mapping relationship between the ground-based slice channel and the new satellite; The following steps are performed by the foundation movement management module: Step A: Deploy a switching gateway in advance after the ground-based UPF anchor point of the satellite communication base station; Step B: After the UE accesses the satellite communication base station, query the existing mapping relationship for the tag of the space-based network corresponding to the UE and the global IP address of the access data network. Step C: If no match is found, assign a space-based network tag and a global IP address for accessing the data network to the UE; Step D: Send the space-based tag corresponding to the UE to the conversion gateway corresponding to the satellite communication base station; Step E: Send the space-based tag and global IP address corresponding to the UE to the satellite UPF anchor point corresponding to the satellite communication base station; Step F: The UE's service data is transmitted to the conversion gateway via the ground-based UPF anchor point of the satellite communication base station. The conversion gateway maps the source address of the service data from a LAN-type IP address to the space-based label corresponding to the UE, and forwards the service data to the satellite UPF anchor point. The satellite UPF anchor point maps the source address of the service data from the space-based label to the global IP address corresponding to the UE, and sends the service data to the data network.

2. The mobility management method for a space-ground collaborative network according to claim 1, characterized in that, In step 1, the space-based core network establishes a new space-based slicing channel, specifically including: S-AMF selects a new S-SMF and establishes an association with that new S-SMF; The new S-SMF selects a new S-UPF based on the new satellite and establishes an N4 session channel with the new S-UPF. At this point, the new space-based slicing channel is established.

3. The mobility management method for a space-ground collaborative network according to claim 1, characterized in that, Also includes: After the space-based core network completes the establishment of a new space-based slice channel, it returns a notification carrying information that the new space-based slice channel has been established.

4. The mobility management method for a space-ground collaborative network according to claim 2, characterized in that, Also includes: Once the ground-based slice channel communicates with the new space-based slice channel, the original space-based slice channel is removed to reclaim the original S-SMF and S-UPF resources.

5. The mobility management method for a space-ground collaborative network according to claim 1, characterized in that, Also includes: If the tag of the space-based network corresponding to the UE and the global IP address of the access data network are found, and the original satellite UPF anchor point has not been moved, then after step B, steps D and F are executed directly.

6. The mobility management method for a space-ground collaborative network according to claim 1, characterized in that, Also includes: If the tag of the space-based network and the global IP address of the access data network corresponding to the UE are found, but the original satellite UPF anchor point has been moved, then after step B, directly execute steps D to F.

7. A mobility management system for a space-ground collaborative network, characterized in that, Includes a space-based mobility management module and / or a ground-based mobility management module; The space-based mobility management module includes: The first management unit is used to send a notification carrying satellite switching information to the space-based core network before a satellite switchover is about to occur, so that the space-based core network can establish a new space-based slice channel; the satellite switching information includes the original satellite information responsible for space-to-ground communication and the information of the new satellite to be switched over; In addition, after the new space-based slicing channel is established, a notification carrying the current ground-based slicing channel information is sent to the space-based core network so that the space-based core network can establish a new space-to-ground link based on the new satellite to establish communication between the new space-based slicing channel and the current ground-based slicing channel. The first mapping relationship storage unit is used to maintain the relevant mapping relationship between the ground-based slice channel and the satellite; The foundation mobility management module includes: The conversion gateway is set after the ground-based UPF anchor point of the satellite communication base station. When the UE's service data arrives at the conversion gateway, it maps the source address of the service data from an IP address of type LAN to the space-based tag corresponding to the UE. The second management unit is used to, after a UE accesses a satellite communication base station, query the existing mapping relationship for the UE's corresponding space-based network tag and access data network global IP address; if not found, assign a space-based network tag and access data network global IP address to the UE; send the UE's corresponding space-based tag to the conversion gateway corresponding to the satellite communication base station; send the UE's corresponding space-based tag and global IP address to the satellite UPF anchor point corresponding to the satellite communication base station; and send the UE's service data to the conversion gateway via the satellite communication base station's ground-based UPF anchor point, so that the conversion gateway can map the source address of the service data from a LAN-type IP address to the UE's corresponding space-based tag, and forward the service data to the satellite UPF anchor point, so that the satellite UPF anchor point can map the source address of the service data from the space-based tag to the UE's corresponding global IP address, and send the service data to the data network. The second mapping relationship storage unit is used to maintain the mapping relationship between the UE, the tag of the space-based network, and the global IP address of the access data network.

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