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WO2025241240A1 - Système, procédé et appareil de commutation de liaison - Google Patents

Système, procédé et appareil de commutation de liaison

Info

Publication number
WO2025241240A1
WO2025241240A1 PCT/CN2024/099673 CN2024099673W WO2025241240A1 WO 2025241240 A1 WO2025241240 A1 WO 2025241240A1 CN 2024099673 W CN2024099673 W CN 2024099673W WO 2025241240 A1 WO2025241240 A1 WO 2025241240A1
Authority
WO
WIPO (PCT)
Prior art keywords
link
gateway station
target
station
information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2024/099673
Other languages
English (en)
Chinese (zh)
Inventor
朱亮
戚少博
常明
高千峰
朱正贤
徐鸣
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yinhe Hangtian Xi'an Technology Co Ltd
Original Assignee
Yinhe Hangtian Xi'an Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yinhe Hangtian Xi'an Technology Co Ltd filed Critical Yinhe Hangtian Xi'an Technology Co Ltd
Publication of WO2025241240A1 publication Critical patent/WO2025241240A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • H04B7/18515—Transmission equipment in satellites or space-based relays
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H04W36/185—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection using make before break

Definitions

  • the embodiments in this specification relate to the field of communication technology, and in particular to link switching systems, methods and apparatus.
  • Satellite communications are becoming increasingly mature.
  • High-throughput satellite communications and low-Earth orbit (LEO) satellite communications are developing rapidly, and satellite communications have significantly improved in terms of speed, latency, and reliability. They can complement and coordinate with terrestrial networks, and in some application scenarios, they can even replace terrestrial networks.
  • Satellite communication networking methods are diverse; base stations or core networks may not be located on satellites, or may be partially or entirely on satellites.
  • the coverage area of the gateway station affects the communication connection, and the link between the base station and the core network may be interrupted, thus affecting the continuity of user services. Therefore, an effective solution is urgently needed to address these issues.
  • embodiments of this specification provide a link switching system.
  • One or more embodiments of this specification also relate to link switching methods, link switching devices, a computing device, a computer-readable storage medium, and a computer program product, to address the technical deficiencies existing in the prior art.
  • a link switching system applied to a base station onboard architecture.
  • the system includes a base station deployed on a target satellite, multiple gateway stations, and a core network, comprising:
  • the base station is configured to, when determining that the gateway station to be switched in the current communication connection is in a switching state, select a target gateway station from among a plurality of gateway stations; send a link establishment request to the core network through the target gateway station, and receive link establishment response information from the core network in response to the link establishment request; create a link switching request based on the link establishment response information, and send it to the core network through the target gateway station, wherein the link switching request carries link information corresponding to the target gateway station;
  • the core network is used to switch the first transmission link corresponding to the gateway station to be switched to the second transmission link corresponding to the target gateway station according to the link information carried in the link switching request, wherein the core network sends downlink messages to the base station through the second transmission link.
  • the base station is further configured to receive an access request submitted by a user equipment, obtain identity information by parsing the access request, and, if the user equipment is verified to be in good condition based on the identity information, send the communication data corresponding to the user equipment to the core network through the gateway station to be switched.
  • the base station is further configured to, when detecting that the target satellite has moved out of the coverage area corresponding to the gateway station to be switched in the current communication connection, determine that the gateway station to be switched is in a switching state, and perform the step of selecting a target gateway station from the plurality of gateway stations; or, acquire ephemeris data corresponding to the target satellite, and, based on the ephemeris data, detect that the satellite movement trajectory of the target satellite exceeds the coverage area corresponding to the gateway station to be switched in the current communication connection, determine that the gateway station to be switched is in a switching state, and Perform the step of selecting the target gateway station from the plurality of gateway stations.
  • the base station is further configured to filter candidate gateway stations among the plurality of gateway stations according to a gateway station screening strategy, determine the gateway station information of each candidate gateway station in the candidate gateway station group, sort the candidate gateway stations included in the candidate gateway station group according to the gateway station information, and determine the target gateway station based on the sorting result.
  • the core network includes mobility management function nodes and session management function nodes;
  • the mobility management function node is used to construct an associated link switching request based on the link switching result and send the associated link switching request to the session management function node.
  • the associated link switching request carries the identification information corresponding to the base station and user plane routing information.
  • the session management function node is used to update the first user routing information according to the identification information and the user plane routing information in response to the associated link switching request.
  • the core network further includes a user plane function node; if the user plane function node is not changed, the session management function node is further configured to construct a target link switching request based on the first user routing information update result, and send the target link switching request to the session management function node, wherein the target link switching request carries the identification information and the user plane routing information.
  • the user plane function node is used to update the second user routing information according to the identification information and the user plane routing information in response to the target link switching request.
  • the session management function node is further configured to select a target user plane function node based on the update result of the first user routing information; and send the user plane routing information to the target user plane function node.
  • the target user plane function node is used to receive and record the user plane routing information, wherein the user plane routing information is used by the target user plane function node to select routing information that matches the second transmission link for downlink user plane data.
  • the user plane routing information includes at least one of the following:
  • Global cell identifier information Global cell identifier information, user plane address information corresponding to the base station, routing identifier information, and user routing information.
  • a link switching method applied to a base station deployed on a target satellite in a link switching system, the link switching system further including multiple gateway stations and a core network, the method comprising:
  • the target gateway station is selected from the plurality of gateway stations
  • the target gateway station sends a link establishment request to the core network and receives the link establishment response information from the core network in response to the link establishment request.
  • a link switching request is created based on the link establishment response information and sent to the core network through the target gateway station.
  • the link switching request carries the link information corresponding to the target gateway station, and the link information is used to switch the first transmission link corresponding to the gateway station to be switched in the core network to the second transmission link corresponding to the target gateway station.
  • a link switching method applied to the core network of a link switching system, the link switching system further comprising a base station and multiple gateway stations deployed on a target satellite, the method comprising:
  • the link establishment response information is fed back to the base station;
  • the first transmission link corresponding to the gateway station to be switched in the current communication connection is switched to the second transmission link corresponding to the target gateway station, wherein the core network sends downlink messages to the base station through the second transmission link.
  • a link switching device applied to a base station deployed on a target satellite in a link switching system, the link switching system further including multiple gateway stations and a core network, the device comprising:
  • the selection module is configured to select a target gateway station from a plurality of gateway stations when it is determined that the gateway station to be switched in the current communication connection is in a switching state.
  • the receiving module is configured to send a link establishment request to the core network through the target gateway station, and to receive the link establishment response information fed back by the core network in response to the link establishment request;
  • the sending module is configured to create a link switching request based on the link establishment response information and send it to the core network through the target gateway station.
  • the link switching request carries link information corresponding to the target gateway station, and the link information is used to switch the first transmission link corresponding to the gateway station to be switched in the core network to the second transmission link corresponding to the target gateway station.
  • a link switching device applied to the core network of a link switching system, the link switching system further comprising a base station and multiple gateway stations deployed on a target satellite, the device comprising:
  • the feedback module is configured to respond to the connection establishment request sent by the base station through the target gateway station and send connection establishment response information back to the base station;
  • the receiving module is configured to receive a link switching request sent by the base station in response to the link establishment response information, wherein the link switching request carries link information corresponding to the target gateway station;
  • the switching module is configured to switch the first transmission link corresponding to the gateway station to be switched in the current communication connection to the second transmission link corresponding to the target gateway station according to the link information carried in the link switching request, wherein the core network sends downlink messages to the base station through the second transmission link.
  • a computing device comprising:
  • the memory is used to store computer-executable instructions
  • the processor is used to execute the computer-executable instructions, which, when executed by the processor, implement the steps of the link switching method described above.
  • a computer-readable storage medium stores computer-executable instructions that, when executed by a processor, implement the steps of the link switching method described above.
  • a computer program product including a computer program or instructions that, when executed by a processor, implement the steps of the link switching method described above.
  • the link switching system provided in this embodiment is applied to a base station onboard architecture.
  • the system includes a base station deployed on a target satellite, multiple gateway stations, and a core network.
  • the base station can select a target gateway station from among the multiple gateway stations before the link corresponding to the old gateway station is interrupted, provided that the current communication connection's gateway station to be switched is in a switching state.
  • a link establishment request can be sent to the core network through the target gateway station, and the core network can receive requests from the core network.
  • the network responds to the link establishment request with a link establishment response information to notify the gateway station of the impending switchover.
  • a link switchover request can be created based on the response information and sent to the core network via the target gateway station.
  • This request carries the link information corresponding to the target gateway station, allowing the core network to determine the gateway station corresponding to the link to be switched.
  • the core network can switch the first transmission link corresponding to the gateway station to be switched to the second transmission link corresponding to the target gateway station, thus enabling the core network to send downlink messages to the base station via the second transmission link.
  • Figure 1 is a schematic diagram of a link switching system provided in one embodiment of this specification
  • Figure 2 is a schematic diagram of a gateway station handover scenario in a link handover system provided in one embodiment of this specification;
  • Figure 3 is an interactive schematic diagram of a link switching system provided in one embodiment of this specification.
  • Figure 4 is a flowchart of a link switching method provided in one embodiment of this specification.
  • FIG. 5 is a flowchart of another link switching method provided in one embodiment of this specification.
  • Figure 6 is a schematic diagram of a link switching device provided in one embodiment of this specification.
  • Figure 7 is a schematic diagram of another link switching device provided in one embodiment of this specification.
  • Figure 8 is a structural block diagram of a computing device provided in one embodiment of this specification.
  • first, second, etc. may be used to describe various information in one or more embodiments of this specification, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this specification, and similarly, second may also be referred to as first. Depending on the context, the word “if” as used herein may be interpreted as "when,” “when,” or "in response to a determination.”
  • the user information including but not limited to user device information, user personal information, etc.
  • data including but not limited to data used for analysis, stored data, displayed data, etc.
  • the collection, use and processing of related data must comply with the relevant laws, regulations and standards of the relevant countries and regions, and corresponding operation entry points are provided for users to choose to authorize or refuse.
  • the terminal mainly accesses the 5G network and obtains services through the air interface.
  • the terminal interacts with the base station through the air interface and with the access and mobility management function (AMF) of the core network through non-access stratum signaling (NAS).
  • AMF access and mobility management function
  • NAS non-access stratum signaling
  • Access and Mobility Management A core network control plane entity primarily responsible for user mobility management, including registration and temporary identifier allocation; maintaining idle and connected states and state transitions; handover in the connected state; and triggering paging functions in the user's idle state.
  • Session Management Function A core network control plane entity primarily responsible for maintaining PDU sessions, allocating user IP addresses, and providing Quality of Service (QoS) control and billing functions; it also buffers downlink data packets received by users in IDLE state and notifies the AMF to page users, among other functions.
  • QoS Quality of Service
  • the core network user plane function entity is responsible for forwarding user data packets and also performs statistics on user data packets for billing and other functions.
  • a gateway station also known as a junction station, is a crucial component of a satellite communication system. Its primary function is to provide interconnectivity between satellite networks and other terrestrial networks, ensuring smooth communication between different networks.
  • the main processes of a gateway station include signal reception, signal processing, routing, signal forwarding, data exchange, management and control, and security protection.
  • This specification provides a link switching system, and also relates to a link switching method, a link switching system apparatus, a computing device, a computer-readable storage medium, and a computer program product, which will be described in detail in the following embodiments.
  • Figure 1 shows a schematic diagram of a link switching system according to an embodiment of this specification.
  • the link switching system 100 is applied to a base station onboard architecture.
  • the link switching system 100 includes a base station 110 deployed on a target satellite, multiple gateway stations 120, and a core network 130, including:
  • the base station 110 is configured to, when determining that the gateway station to be switched in the current communication connection is in a switching state, select a target gateway station from among a plurality of gateway stations; send a link establishment request to the core network through the target gateway station, and receive link establishment response information from the core network in response to the link establishment request; create a link switching request based on the link establishment response information, and send it to the core network through the target gateway station, wherein the link switching request carries link information corresponding to the target gateway station;
  • the core network 130 is used to switch the first transmission link corresponding to the gateway station to be switched to the second transmission link corresponding to the target gateway station according to the link information carried in the link switching request, wherein the core network sends downlink messages to the base station through the second transmission link.
  • the link switching system provided in this embodiment is applied to a base station-on-satellite architecture, where the base station is deployed on a satellite.
  • the inter-satellite links between satellites are similar to the Xn interface between ground base stations; simultaneously, the feeder link between the satellite and the gateway station is actually part of the backhaul network between the base station and the core network. This shortens the communication distance between the terminal device and the satellite base station, thus reducing communication latency.
  • the number of gateway stations can be reduced, thereby lowering the overall cost.
  • the base station deployed on the target satellite can be a 4G base station, a 5G base station, or a base station used on other satellites; this embodiment does not impose any limitations.
  • the core network refers to a complete and efficient system in a satellite communication system, consisting of the core network (CN) and the data network (DN).
  • a communication network consists of a core network (CN), which is the central hub responsible for handling various communication services, including voice, data, and multimedia. It connects different network nodes, ensuring smooth information transmission within the network. Its main functions include routing, service processing, mobility management, session management, and user data management. Through the core network (CN), users can communicate across regions and networks, enjoying various convenient communication services.
  • the data network (DN) focuses on data transmission and exchange. It is responsible for transmitting various types of data within the communication network, including text, images, and video.
  • the data network (DN) employs efficient data transmission protocols and technologies to ensure data reaches its destination quickly and accurately within the network.
  • the data network (DN) provides data storage, backup, and recovery functions to guarantee the security and reliability of user data.
  • the gateway station to be switched over in the current communication connection specifically refers to the gateway station that is still in a communication connection with the base station at the current moment. If the gateway station to be switched over is in a switching state, it means that after a certain interval, the gateway station to be switched over will disconnect from the base station. To avoid service interruption due to gateway station switching, a proactive switch to a new gateway station can be initiated before the communication connection is disconnected, thus ensuring service continuity.
  • the target gateway station specifically refers to the new gateway station selected from multiple gateway stations before the gateway station to be switched over disconnects. This new gateway station will replace the gateway station to continue signal processing.
  • the link establishment request specifically refers to the request triggered when a gateway station is to be switched over.
  • This request needs to be sent to the core network to complete the link switch of the corresponding gateway station. After the switch is completed, communication between the base station, the new gateway station, and the core network can be maintained.
  • the link establishment response information specifically refers to the response information fed back by the core network in response to the link establishment request. This information informs the base station that a gateway station switch can be performed, thereby achieving link switching to the transmission link corresponding to the new gateway station and avoiding service interruption due to passive gateway station switching.
  • a link switching request is a link switching request sent by the base station to the core network. This request carries link information to inform the core network which gateway station corresponds to the link that needs to be switched. The switched link will change the mapping of all user plane routing information, so that subsequent communication services can be completed based on the new gateway station.
  • the first transmission link specifically refers to the transmission link corresponding to the gateway station to be handed over. This link is currently connected, and before the current stage, message transmission between the base station, the gateway station to be handed over, and the core network is completed through the first transmission link.
  • the second transmission link specifically refers to the transmission link corresponding to the target gateway station. This link will replace the first transmission link after the current stage, enabling message transmission between the base station, the target gateway station, and the core network through the second transmission link. This allows the core network to subsequently send downlink messages to the base station via the second transmission link through the target gateway station.
  • a status check can be performed on the currently connected gateway station before the switchover. If it is determined that the currently connected gateway station is in a switching state, it indicates that a gateway station switchover event will occur within a certain period. To avoid service interruption caused by passive gateway station switching, the switchover operation can be completed in advance. At this point, a target gateway station can be selected from among the multiple gateway stations. Subsequently, a link establishment request can be sent to the core network through the target gateway station, and the core network's link establishment response information can be received, thus notifying the gateway station of the impending switchover.
  • a link switching request can be created based on the link establishment response information and sent to the core network through the target gateway station, carrying the link information corresponding to the target gateway station, so that the core network can determine the gateway station corresponding to the link to be switched. Furthermore, upon receiving a link handover request carrying link information, the core network can switch the first transmission link corresponding to the gateway station to be switched to the second transmission link corresponding to the target gateway station, thereby enabling the core network to send downlink messages to the base station via the second transmission link. This achieves automatic detection and completion of gateway station handover before passive link disconnection, thus resolving the problem of user service interruption caused by gateway station handover and ensuring the continuity of user services.
  • the base station communicates with the core network (CN+DN) through gateway stations, and multiple gateway stations exist on the ground.
  • This embodiment uses the currently connected gateway station 1 and the switched gateway station 2 as an example to illustrate the above link switching system.
  • the base station on the satellite can send a link establishment request to the core network through the gateway station 2 to be switched, which is used to notify the core network that a gateway station switching operation is required.
  • the core network will respond to the link establishment request and send back link establishment response information to the base station through gateway station 2, which is used to notify the base station that the link switching operation can be performed.
  • the base station creates a link handover request containing the link information of the corresponding gateway station 2 based on the link establishment response information, and sends it to the core network through gateway station 2.
  • the link information corresponding to gateway station 2 is used to instruct the core network to send subsequent downlink information to the base station via the new link.
  • the core network Upon receiving the link handover request carrying the link information, the core network first sends a link handover response to the base station. Then, according to the link information, it switches the transmission link corresponding to gateway station 1 to the transmission link of the corresponding gateway station 2.
  • the link switching system provided in this embodiment can automatically detect and complete the switching of gateway stations before the link is passively disconnected, thereby solving the problem of user service interruption caused by gateway station switching and ensuring the continuity of user services.
  • the base station Before the link handover, the base station, the gateway station to be handed over, and the core network will provide transmission services to users through their communication connections. Therefore, when a user accesses the satellite, the base station on the satellite will connect to the core network through the gateway station to be handed over.
  • the base station is also used to receive access requests submitted by user equipment, obtain identity information by parsing the access requests, and, if the user equipment is verified to be qualified based on the identity information, send the communication data corresponding to the user equipment to the core network through the gateway station to be handed over.
  • an access request refers to a request triggered by a user device when accessing a target satellite. This request is used to trigger authentication of the user device, which specifically refers to the user's terminal device, such as a computer, smartwatch, or mobile phone.
  • the identity information can include the user device's identification information, network access credentials, etc.
  • the access request submitted by the user equipment can be received.
  • the identity information can be obtained by parsing the access request; and the user equipment can be authenticated based on the identity information. If the authentication is successful, the communication data corresponding to the user equipment can be sent to the core network through the gateway station to be switched.
  • this request may include the user's identity information, location information, and the type of communication service required.
  • the request is then forwarded to the ground controller via the terrestrial network.
  • the ground controller formulates appropriate routing and access point selection policies to ensure the user's request is effectively forwarded to the satellite.
  • the user's request is then sent to the designated target satellite via a router, according to the policies defined by the ground controller.
  • the satellite Upon receiving the request, the satellite performs authentication and responds. After successful authentication, the satellite returns a response, which is transmitted to the ground controller via routers and switches, completing the user's access process.
  • the base station on the target satellite forwards the user's communication data to the gateway station awaiting handover.
  • the gateway station acting as a bridge, converts the satellite network signal into a signal recognizable by the terrestrial network, thus transmitting the corresponding user data to the core network.
  • the gateway station awaiting handover sends the user data to the AMF in the core network.
  • the AMF is responsible for handling user access requests and performing mobility management, ensuring seamless handover and communication continuity for the user within the network.
  • the AMF sends the user data to the UPF.
  • the UPF as the user plane management function, is responsible for data routing, forwarding, and processing, ensuring efficient transmission of user data within the network.
  • the status detection of the currently connected gateway station needs to be completed before link switching. Only when the currently connected gateway station is in a switching state can it be concluded that the current link has not been interrupted and a new link needs to be switched, thereby achieving the goal of uninterrupted user service. Therefore, the status detection of the gateway station can be determined according to the gateway station's coverage area or according to ephemeris data.
  • the base station is also used to determine that the gateway station to be switched is in a switching state when it detects that the target satellite has moved out of the coverage area corresponding to the gateway station to be switched in the current communication connection, and to perform the step of selecting the target gateway station from the multiple gateway stations; or, to obtain the ephemeris data corresponding to the target satellite, and to determine that the gateway station to be switched is in a switching state when the satellite movement trajectory of the target satellite is detected to exceed the coverage area corresponding to the gateway station to be switched in the current communication connection, and to perform the step of selecting the target gateway station from the multiple gateway stations.
  • ephemeris data refers to the ephemeris data corresponding to the target satellite, including but not limited to key information such as the target satellite's position, velocity, and orbital parameters.
  • the satellite's movement trajectory refers to the trajectory of the target satellite at the current moment, which determines the time it takes for the satellite to move out of the coverage area of the gateway station to be switched.
  • the coverage area refers to a set coverage area smaller than the actual coverage area of the gateway station to be switched. This allows the satellite to be put into handover mode when it exceeds this set coverage area, without completely disconnecting from the gateway station, thus ensuring that the link switchover is completed before the gateway station switches, avoiding service interruption for users.
  • the target satellite when the target satellite is detected to have moved out of the coverage area of the gateway station to be switched in the current communication connection, it indicates that the target satellite is about to undergo a gateway station switch operation.
  • the gateway station to be switched In order to avoid the interruption of user services caused by the switch, it can be determined that the gateway station to be switched is in a switching state, and the step of selecting the target gateway station from multiple gateway stations can be executed so as to perform link switching in the future and ensure the continuity of user services.
  • the handover status can also be determined through ephemeris data.
  • the ephemeris data corresponding to the target satellite can be obtained.
  • the satellite movement trajectory of the target satellite can be detected based on the ephemeris data to see if it exceeds the coverage area of the current communication connection to be switched gateway station. If it does, it means that the target satellite is about to undergo a gateway station handover operation.
  • it can be determined that the gateway station to be switched is in a handover state, and the step of selecting the target gateway station from the multiple gateway stations can be executed so that the link can be switched later to ensure the continuity of user services.
  • the gateway station is a key node in the satellite communication system, and considering the limited coverage of the satellite, when the satellite moves beyond the coverage of the current gateway station, it is necessary to switch to a new gateway station in order to ensure the continuity and stability of communication.
  • the base station can first receive and process the ephemeris data provided by the satellite.
  • This ephemeris data can include the satellite's position, velocity, and orbital parameters.
  • the base station uses algorithms to analyze the ephemeris data, predicting the satellite's trajectory and positional changes over a future period. Subsequently, the base station can determine whether the satellite is about to move out of the current gateway station's coverage area based on the predicted satellite trajectory; this process can be achieved by referencing the gateway station's geographical location, antenna pointing, and signal coverage area.
  • the status of the gateway station can be accurately determined, thereby triggering link switching operations before the gateway station is switched over, avoiding the problem of user service interruption and ensuring user service continuity.
  • a gateway station screening strategy can be followed.
  • the base station is further configured to screen a candidate gateway station group from the plurality of gateway stations according to the gateway station screening strategy, determine the gateway station information of each candidate gateway station in the candidate gateway station group, sort the candidate gateway stations included in the candidate gateway station group according to the gateway station information, and determine the target gateway station based on the sorting result.
  • the gateway station selection strategy refers to the strategy of selecting a suitable gateway station from multiple gateway stations for the current scenario. This strategy can evaluate gateway stations based on parameters such as signal strength, quality, and bandwidth, and then select candidate gateway stations from multiple gateway stations to form a gateway station candidate group.
  • a gateway station candidate group specifically refers to a set of gateway stations selected from multiple gateway stations that are likely to be suitable for the current scenario.
  • Gateway station information specifically refers to the attribute information corresponding to the candidate gateway stations, including but not limited to signal quality information, available bandwidth information, latency information, jitter information, etc.
  • a target gateway station when selecting a target gateway station, you can first filter candidate gateway stations from multiple gateway stations according to the gateway station screening strategy. At this time, you can determine the gateway station information of each candidate gateway station in the candidate gateway station group. Then, sort the candidate gateway stations contained in the candidate gateway station group according to the gateway station information, and select the gateway station with the highest priority as the target gateway station based on the sorting result.
  • the first step is to measure wireless resources using base stations, including key parameters such as signal strength, quality, and available bandwidth.
  • a group of candidate gateway stations is selected from multiple gateway stations. These candidate gateway stations can meet the user's communication needs and provide a stable connection.
  • the candidate gateway stations can be prioritized, based on performance indicators such as signal quality, available bandwidth, latency, and jitter, as well as historical performance and user preferences.
  • the optimal gateway station is selected as the target gateway station, facilitating subsequent switching of the transmission link to the corresponding target gateway station, thereby providing stable and continuous communication services.
  • gateway station 2 when a base station on a satellite determines, based on the satellite's ephemeris data, that it will move out of the coverage area of gateway station 1, it is determined that the gateway station needs to be changed. To select a suitable gateway station from multiple gateway stations to provide communication services, the load, available resources, and communication quality between users for each gateway station can be obtained. Based on these multi-dimensional considerations, gateway stations 2, 3, and 4 are determined to provide stable communication services. Further calculations are then performed on the signal quality, latency, jitter, and other performance indicators of gateway stations 2, 3, and 4. Gateway station 2 is assigned a score of S2, gateway station 3 a score of S3, and gateway station 4 a score of S4; and S2 > S4 > S3. Therefore, gateway station 2 is determined to be the optimal choice, and it can be selected as the target gateway station for subsequent link switching operations.
  • the multi-dimensional performance indicators of the gateway station to select the target gateway station, it can be ensured that when changing the gateway station, a gateway station with stable communication services can be selected as the target gateway station, thereby guaranteeing the quality of subsequent communication services.
  • the core network includes mobility management function nodes and session management function nodes
  • the mobility management function node is used to update the routing information according to the link handover.
  • the path handover result is used to construct an associated link handover request, which is then sent to the session management function node.
  • the associated link handover request carries the identification information corresponding to the base station and the user plane routing information.
  • the session management function node is used to update the first user routing information according to the identification information and the user plane routing information in response to the associated link switching request.
  • the Mobility Management Node refers to the node corresponding to the Access and Mobility Management Function (AMF).
  • the Session Management Node (SMF) refers to the node corresponding to the Session Management Function (SMF).
  • the Associated Link Handover Request is a request generated when the Session Management Node needs to update its routing information after the first transmission link has been switched to the second transmission link. This request triggers the update of the routing information of the Session Management Node, ensuring that the updated route is associated with the second transmission link, thus enabling communication through the target gateway station.
  • Identification Information refers to the unique identifier corresponding to the base station.
  • User Plane Routing Information records information related to the forwarding of data packets and the selection of routes associated with the target gateway station. When updating the user routing information corresponding to the Session Management Node, it can map the route to the second transmission link, thereby enabling subsequent communication services through the target gateway station.
  • the Session Management Function (SMF) node in the core network also needs to update the routing information.
  • the Mobility Management Function (AMF) node in the core network can first construct an associated link handover request based on the link handover result, and then send the associated link handover request to the SMF node.
  • the associated link handover request can carry the base station's identification information and user plane routing information.
  • the SMF node can respond to the request by updating the first user routing information under the node based on the identification information and user plane routing information, ensuring that all routing information is associated with the target gateway station, so that subsequent communication services can be completed through the target gateway station.
  • the Session Management Function (SMF) node completes the update of the routing information under the node, if the current gateway station changes without any change in the User Plane Function (UPF) node, then the routing information also needs to be updated for the UPF node.
  • the Session Management Function (SMF) node is further configured to construct a target link switching request based on the first user routing information update result, and send the target link switching request to the Session Management Function (SMF) node, wherein the target link switching request carries the identification information and the user plane routing information;
  • the user plane function node is used to update the second user routing information according to the identification information and the user plane routing information in response to the target link switching request.
  • a User Plane Function Node refers to the node corresponding to the User Plane Function (UPF) in the core network.
  • a Target Link Switching Request is a request triggered after the first user routing information update, when the routing information of the UPF needs to be updated. This request is used to trigger the routing information update of the UPF, ensuring that the updated routing information is associated with the second transmission path, thus enabling communication to be completed through the target gateway station.
  • the session management function node can first construct a target link handover request based on the update result of the first user routing information, and then send the target link handover request to the session management function node. Furthermore, to achieve the purpose of handover to the target gateway station, the target link handover request carries identification information and user plane routing information. Further, after receiving the target link handover request, the user plane function node can respond to the target link handover request according to... The identification information and user plane routing information update the routing information of the second user under the node, so that all routing information is associated with the target gateway station, and subsequent communication services can be completed through the target gateway station.
  • the link handover system includes user terminals, base stations deployed on satellites, old gateway stations, new gateway stations, and a core network.
  • the core network consists of Mobility Management Function Node (AMF), Session Management Function Node (SMF), and User Plane Function Node (UPF).
  • AMF Mobility Management Function Node
  • SMF Session Management Function Node
  • UPF User Plane Function Node
  • Step 1 The user accesses the satellite, and the base station on the satellite connects to the AMF and UPF through the old gateway station.
  • Step 2 The satellite will move beyond the coverage area of the old gateway station, or the gateway station will be changed based on the satellite's ephemeris information.
  • Step 3 The base station sends a link establishment request to the AMF through the new gateway station.
  • Step 4 The AMF responds to the link establishment request by sending the link establishment response back to the base station through the new gateway station.
  • Step 5 The base station sends a link handover request to the AMF through the new gateway station, and the message may carry user plane routing information, which may be the base station's new user plane address or other user plane routing related information.
  • Step 6 The AMF responds to the link handover request by sending the handover response information back to the base station.
  • Step 7 The AMF switches the link of the user under the current radio node to the link associated with the new gateway station, so that the downlink information subsequently sent to the radio node can be sent to the base station through the new link.
  • the SMF and UPF also need to update the routing information under the node.
  • Step 8 The AMF sends a link switching request to the SMF.
  • the request may include the base station ID and user plane routing information of the radio node.
  • Step 9 The SMF responds to the link switching request by sending back the link switching response information to the AMF.
  • Step 10 SMF updates the routing information of users under the wireless node.
  • Step 11 The SMF sends a link switching request to the UPF.
  • the request may include the base station ID and user plane routing information of the radio node.
  • Step 12 The UPF responds to the link switching request by sending the link switching response information back to the SMF.
  • Step 13 UPF updates the routing information of users under the wireless node.
  • the routing information of the session management function nodes and user plane function nodes can be updated in conjunction with the link switching request. This will ensure that subsequent communications can be completed through the new gateway station, thus avoiding the problem of user service interruption.
  • the session management function node is also used to select the target user plane function node according to the update result of the first user routing information; and send the user plane routing information to the target user plane function node;
  • the target user plane function node is used to receive and record the user plane routing information, wherein the user plane routing information is used by the target user plane function node to select routing information that matches the second transmission link for downlink user plane data.
  • the target user plane function node refers to the new user plane function node selected after the gateway station handover. Therefore, in the event of a change in the user plane function node, it indicates that a new user plane function node needs to be selected. Thus, the session management function node can be selected based on the first...
  • the user routing information update result selects the target user plane function node; then the user plane routing information is sent to the target user plane function node; the target user plane function node receives the user plane routing information and can directly record it, so that it can select the routing information of the second transmission link for downlink user plane data based on the user plane routing information at the target user plane function node.
  • the Session Management Function Node can modify the User Plane Function Node, including but not limited to inserting new User Plane Function Nodes, changing User Plane Function Nodes, and deleting User Plane Function Nodes.
  • the user plane routing information can be composed of different information depending on different needs. This includes, but is not limited to, global cell identifier information, user plane address information corresponding to the base station, routing identifier information, and user routing information. In specific implementations, the appropriate information can be selected based on actual requirements; this embodiment does not impose any limitations.
  • the link switching system provided in this embodiment is applied to a base station onboard architecture.
  • This system includes a base station deployed on a target satellite, multiple gateway stations, and a core network.
  • the base station determines that the gateway station to be switched for the current communication connection is in a switching state and selects a target gateway station from among the multiple gateway stations.
  • a link establishment request is sent to the core network through the target gateway station, and the core network receives a link establishment response from the core network in response to the request, thus notifying the gateway station of the impending switch.
  • a link switching request can then be created based on the link establishment response information and sent to the core network through the target gateway station, carrying the link information corresponding to the target gateway station, so that the core network can determine the gateway station corresponding to the link to be switched. Furthermore, upon receiving a link handover request carrying link information, the core network can switch the first transmission link corresponding to the gateway station to be switched to the second transmission link corresponding to the target gateway station, thereby enabling the core network to send downlink messages to the base station via the second transmission link. This achieves automatic detection and completion of gateway station handover before passive link disconnection, thus resolving the problem of user service interruption caused by gateway station handover and ensuring the continuity of user services.
  • Figure 4 is a flowchart of a link handover method provided in one embodiment of this specification. The method is applied to a base station deployed on a target satellite in a link handover system.
  • the link handover system further includes multiple gateway stations and a core network. The method includes:
  • Step S402 If it is determined that the gateway station to be switched in the current communication connection is in a switching state, select the target gateway station from the plurality of gateway stations;
  • Step S404 Send a link establishment request to the core network through the target gateway station, and receive the link establishment response information from the core network in response to the link establishment request;
  • Step S406 Create a link switching request based on the link establishment response information and send it to the core network through the target gateway station.
  • the link switching request carries the link information corresponding to the target gateway station, and the link information is used to switch the first transmission link corresponding to the gateway station to be switched in the core network to the second transmission link corresponding to the target gateway station.
  • Figure 5 is a flowchart of another link switching method provided in one embodiment of this specification.
  • the method is applied to the core network of a link switching system, which further includes a base station and multiple gateway stations deployed on the target satellite.
  • the method includes:
  • Step S502 In response to the link establishment request sent by the base station through the target gateway station, feedback link establishment response information is sent back to the base station;
  • Step S504 Receive a link switching request sent by the base station in response to the link establishment response information, wherein the link switching request carries the link information corresponding to the target gateway station;
  • Step S506 According to the link information carried in the link switching request, the first transmission link corresponding to the gateway station to be switched in the current communication connection is switched to the second transmission link corresponding to the target gateway station, wherein the core network sends downlink messages to the base station through the second transmission link.
  • FIG. 6 shows a schematic diagram of the structure of a link switching device provided in one embodiment of this specification. As shown in Figure 6, the device is applied to a base station deployed on a target satellite in a link switching system.
  • the link switching system also includes multiple gateway stations and a core network.
  • the device includes:
  • the selection module 602 is configured to select a target gateway station from the plurality of gateway stations when it is determined that the gateway station to be switched in the current communication connection is in a switching state.
  • the receiving module 604 is configured to send a link establishment request to the core network through the target gateway station, and to receive the link establishment response information fed back by the core network in response to the link establishment request;
  • the sending module 606 is configured to create a link switching request based on the link establishment response information and send it to the core network through the target gateway station.
  • the link switching request carries link information corresponding to the target gateway station, and the link information is used to switch the first transmission link corresponding to the gateway station to be switched in the core network to the second transmission link corresponding to the target gateway station.
  • this specification also provides another embodiment of a link switching device.
  • Figure 7 shows a schematic diagram of the structure of another link switching device provided in one embodiment of this specification. As shown in Figure 7, this device is applied to the core network of a link switching system.
  • the link switching system also includes a base station deployed on a target satellite and multiple gateway stations.
  • the device includes:
  • Feedback module 702 is configured to respond to a link establishment request sent by the base station through the target gateway station and send back link establishment response information to the base station;
  • Receiving module 704 is configured to receive a link switching request sent by the base station in response to the link establishment response information, wherein the link The route switching request carries the link information corresponding to the target gateway station;
  • the switching module 706 is configured to switch the first transmission link corresponding to the gateway station to be switched in the current communication connection to the second transmission link corresponding to the target gateway station according to the link information carried in the link switching request, wherein the core network sends downlink messages to the base station through the second transmission link.
  • Figure 8 shows a structural block diagram of a computing device 800 according to one embodiment of this specification.
  • the components of the computing device 800 include, but are not limited to, a memory 810 and a processor 820.
  • the processor 820 is connected to the memory 810 via a bus 830, and a database 850 is used to store data.
  • the computing device 800 also includes an access device 840, which enables the computing device 800 to communicate via one or more networks 860.
  • networks 860 include a public switched telephone network (PSTN), a local area network (LAN), a wide area network (WAN), a personal area network (PAN), or a combination of communication networks such as the Internet.
  • Access device 840 may include one or more of any type of wired or wireless network interface (e.g., network interface card (NIC)), such as an IEEE 802.11 Wireless Local Area Network (WLAN) wireless interface, a Wi-MAX (Worldwide Interoperability for Microwave Access) interface, an Ethernet interface, a Universal Serial Bus (USB) interface, a cellular network interface, a Bluetooth interface, or a Near Field Communication (NFC) interface.
  • NIC network interface card
  • the aforementioned components of the computing device 800 may be interconnected, for example, via a bus. It should be understood that the block diagram of the computing device shown in FIG. 8 is merely illustrative and not intended to limit the scope of this specification. Those skilled in the art can add or replace other components as needed.
  • the computing device 800 can be any type of stationary or mobile computing device, including mobile computers or mobile computing devices (e.g., tablet computers, personal digital assistants, laptop computers, notebook computers, netbooks, etc.), mobile phones (e.g., smartphones), wearable computing devices (e.g., smartwatches, smart glasses, etc.) or other types of mobile devices, or stationary computing devices such as desktop computers or personal computers (PCs).
  • the computing device 800 can also be a mobile or stationary server.
  • the processor 820 is configured to execute the following computer-executable instructions, which, when executed by the processor, implement the steps of the link switching method described above.
  • An embodiment of this specification also provides a computer-readable storage medium storing computer-executable instructions that, when executed by a processor, implement the steps of the link switching method described above.
  • An embodiment of this specification also provides a computer program product, including a computer program or instructions that, when executed by a processor, implement the steps of the link switching method described above.
  • the computer instructions include computer program code, which may be in the form of source code, object code, executable file, or certain intermediate forms.
  • the computer-readable medium may include: any entity or device capable of carrying the computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium may be appropriately added or removed according to the requirements of patent practice. For example, in some regions, according to patent practice, computer-readable media may not include electrical carrier signals and telecommunication signals.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)

Abstract

La présente invention concerne, dans ses modes de réalisation, un système, un procédé et un appareil de commutation de liaison. Le système de commutation de liaison est appliqué à une architecture de station de base sur satellite et le système comprend une station de base déployée sur un satellite cible, une pluralité de stations de passerelle et un réseau central. La station de base est utilisée : lorsqu'il est déterminé qu'une station de passerelle à commuter dans une connexion de communication actuelle est dans un état de commutation, pour sélectionner une station de passerelle cible parmi la pluralité de stations de passerelle ; pour envoyer une demande d'établissement de liaison au réseau central au moyen de la station de passerelle cible, et pour recevoir des informations de réponse d'établissement de liaison renvoyées par le réseau central pour la demande d'établissement de liaison ; et pour créer une demande de commutation de liaison sur la base des informations de réponse d'établissement de liaison, et pour l'envoyer au réseau central par l'intermédiaire de la station de passerelle cible, la demande de commutation de liaison contenant des informations de liaison correspondant à la station de passerelle cible. Le réseau central est utilisé pour commuter, selon les informations de liaison contenues dans la demande de commutation de liaison, une première liaison de transmission correspondant à la station de passerelle à commuter dans une seconde liaison de transmission correspondant à la station de passerelle cible, le réseau central envoyant un message de liaison descendante à la station de base par l'intermédiaire de la seconde liaison de transmission.
PCT/CN2024/099673 2024-05-22 2024-06-17 Système, procédé et appareil de commutation de liaison Pending WO2025241240A1 (fr)

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CN114157344A (zh) * 2021-12-09 2022-03-08 成都天奥集团有限公司 一种支持卫星馈电链路无损切换的方法
WO2023098868A1 (fr) * 2021-12-02 2023-06-08 大唐移动通信设备有限公司 Procédé de transfert entre satellites, station de base portée par satellite, dispositif de réseau central et support de stockage

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CN112312486A (zh) * 2019-07-25 2021-02-02 大唐移动通信设备有限公司 一种馈电链路切换时的信息处理方法、信关站及装置、介质
CN111314981A (zh) * 2020-02-20 2020-06-19 北京华力创通科技股份有限公司 用于馈电链路切换的终端重选方法及装置
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