Non-terrestrial network based communication method, apparatus, device and system

Abstract

The present disclosure provides a non-terrestrial network-based communication method, device, equipment and system, and relates to the field of non-terrestrial network communication. The context of the user equipment on the NGSO satellite base station side is relocated to the core network. In the case where the inter-satellite link is unavailable, the non-active user equipment can restore the network connection based on the context of the user equipment on the core network side, thereby well supporting the non-active UE mobility in the NTN NGSO satellite base station scenario.

Description

Technical Field

[0001] This disclosure relates to the field of non-terrestrial network communication, and in particular to a communication method, apparatus, device and system based on non-terrestrial networks. Background Technology

[0002] Terrestrial mobile communication networks, constrained by factors such as network deployment costs and geographical environment, cannot provide seamless global coverage. Non-terrestrial communication networks, such as satellite communication networks, have wide coverage areas and are less affected by geographical environment, and can serve as a supplement to terrestrial cellular networks, providing seamless global coverage.

[0003] Non-terrestrial networks (NTNs) are networks or network segments that use airborne or space-based vehicles to carry transmission equipment, relay nodes, or base stations. Currently, NTNs define two transmission architectures: a transparent transmission architecture, where signals undergo only frequency conversion and signal amplification on the satellite, with base stations located on the ground; and a regenerative transmission architecture, where the satellite possesses some or all of the base station functions, and access or processing occurs at the satellite's base station. Gradually migrating some or all of the functions of terrestrial base stations and core networks to satellites is the future trend of satellite-terrestrial convergence.

[0004] Geostationary Satellite Orbit (GSO) satellites, or Geostationary Earth Orbit (GEO) satellites, are positioned at an altitude of approximately 35,786 kilometers relative to the Earth. Theoretically, three GSO / GEO satellites can achieve global coverage.

[0005] Non-Geosynchronous Orbit (NGSO) includes satellite orbits other than geosynchronous orbit. NGSO orbits include Low Earth Orbit (LEO) at an altitude of approximately 300 km to 1500 km and Medium Earth Orbit (MEO) at an altitude of approximately 7000 km to 25000 km.

[0006] If a user equipment (UE) enters the Radio Resource Control (RRC) inactive state (RRC_INACTIVE) after communicating with a base station deployed on an NGSO satellite, such as a gNB (the next-generation Node B), when the UE wants to reconnect to the new NGSO satellite-borne base station, it will first execute the UE context retrieval procedure. However, the successful execution of this procedure is subject to the availability of the inter-satellite link or feeder link between the original NGSO satellite-borne base station and the new NGSO satellite-borne base station.

[0007] During UE RRC connection restoration, terrestrial networks (TN) do not have limitations on the availability of inter-satellite links or feeder links, while non-terrestrial networks do have limitations on the availability of inter-satellite links or feeder links. Therefore, the current UE RRC connection restoration mechanism designed for TN networks cannot well support NTN NGSO scenarios. Summary of the Invention

[0008] This disclosure proposes a user equipment connection recovery scheme that supports non-terrestrial network scenarios. The scheme relocates the context of the user equipment on the NGSO satellite base station side to the core network. When the inter-satellite link is unavailable, the inactive user equipment can recover the network connection based on the context of the user equipment on the core network side.

[0009] This disclosure provides several embodiments of a communication method based on a non-terrestrial network, applied to core network equipment, including:

[0010] In response to a first request message sent by a first base station deployed on a first non-geostationary satellite for relocating the context of a user equipment to the core network, the context of the user equipment carried in the first request message is stored, and a first identifier is assigned to uniquely identify the context of the user equipment in the core network.

[0011] In response to a second request message sent by a second base station deployed on a second non-geostationary satellite for obtaining the context of a user equipment, the second request message including the first identifier, the context of the user equipment corresponding to the first identifier is sent to the second base station.

[0012] In some embodiments, the communication method further includes: sending a first response message to the first base station to indicate acceptance or rejection of the first request message, wherein if the first request message is accepted, the first response message includes the first identifier.

[0013] In some embodiments, the second request message is sent by the second base station in response to the connection restoration request message of the user equipment, and the connection restoration request message of the user equipment includes the first identifier obtained by the user equipment from the first base station.

[0014] In some embodiments, the connection restoration request message of the user equipment includes the first identifier obtained by the user equipment from the connection release message of the first base station, the connection release message being used to instruct the user equipment to release the connection.

[0015] In some embodiments, the communication method further includes:

[0016] In response to a third request message sent by the first base station for removing the context of a user equipment, the third request message including the first identifier, the context of the user equipment corresponding to the first identifier is removed from the core network;

[0017] Send a third response message to the first base station for the third request message.

[0018] In some embodiments, the communication method further includes:

[0019] After sending the context of the user equipment corresponding to the first identifier to the second base station, the context of the user equipment corresponding to the first identifier is removed from the core network.

[0020] This disclosure provides several embodiments of a communication method based on a non-terrestrial network, applied to base stations deployed on non-geostationary satellites, including:

[0021] The first base station deployed on the first non-geostationary satellite sends a first request message to the core network equipment to relocate the context of the user equipment to the core network.

[0022] The first base station receives a first response message from the core network device that is a first request message, which is used to indicate whether to accept or reject the first request message. If the first request message is accepted, the first response message includes a first identifier for uniquely identifying the context of the user equipment in the core network.

[0023] A second base station deployed on a second non-geostationary satellite sends a second request message to the core network equipment for obtaining the context of the user equipment, the second request message including the first identifier;

[0024] The second base station receives a second response message from the second request message sent by the core network device, and obtains the context of the user equipment corresponding to the first identifier from the second response message.

[0025] In some embodiments, the communication method further includes: the first base station sending a connection release message to the user equipment, the connection release message being used to instruct the user equipment to release the connection, the connection release message including the first identifier.

[0026] In some embodiments, the second base station sending a second request message for obtaining the context of the user equipment to the core network device includes: the second base station responding to the connection restoration request message of the user equipment sending a second request message for obtaining the context of the user equipment to the core network device, wherein the connection restoration request message of the user equipment includes the first identifier.

[0027] In some embodiments, the second base station sending a second request message to the core network device for obtaining the context of the user equipment includes: the second base station sending a second request message to the core network device for obtaining the context of the user equipment when the inter-satellite link is unavailable.

[0028] In some embodiments, the communication method further includes:

[0029] The first base station sends a third request message to the core network device for removing the context of the user equipment, the third request message including the first identifier;

[0030] The first base station receives the third response message of the third request message sent by the core network device.

[0031] In some embodiments, the communication method further includes:

[0032] When the inter-satellite link is available, the second base station sends a fourth request message to the first base station for obtaining the context of the user equipment, the fourth request message including the first identifier;

[0033] The second base station receives the fourth response message of the fourth request message sent by the first base station, and obtains the context of the user equipment corresponding to the first identifier from the fourth response message.

[0034] This disclosure provides some embodiments of a communication method based on a non-terrestrial network, applied to user equipment, including:

[0035] Receive a connection release message sent by a first base station deployed on a first non-geostationary satellite, which instructs a user equipment to release a connection. The connection release message includes a first identifier, which is used to uniquely identify the context of the user equipment in the core network.

[0036] Send a connection restoration request message to a second base station deployed on a second non-geosynchronous satellite, the connection restoration request message including the first identifier;

[0037] The system receives a connection restoration message sent by the second base station, the connection restoration message including the context of the user equipment corresponding to the first identifier.

[0038] In some embodiments, the connection restoration message includes the context of the user equipment corresponding to the first identifier obtained by the second base station from the core network equipment or the first base station.

[0039] In some embodiments, the first identifier includes identification information of the core network device and identification information of the user equipment.

[0040] In some embodiments, the context of the user equipment includes at least one of the following:

[0041] The identification information of the user equipment;

[0042] Access layer context information;

[0043] Security configuration information;

[0044] Community configuration information;

[0045] The capability information of the user equipment;

[0046] Context validity information.

[0047] In some embodiments, the connection release message further includes at least one of the following:

[0048] The identification information of the user equipment;

[0049] Radio access network notification area RNA configuration information;

[0050] Periodic RNA update timer;

[0051] Security configuration information;

[0052] Wireless resource configuration information;

[0053] Measurement configuration information;

[0054] Auxiliary parameters.

[0055] Some embodiments of this disclosure provide a core network device, including: a memory; and a processor coupled to the memory, the processor being configured to execute a non-terrestrial network-based communication method on the core network side based on instructions stored in the memory.

[0056] Some embodiments of this disclosure propose a base station deployed on a non-geostationary satellite, comprising: a memory; and a processor coupled to the memory, the processor being configured to execute a non-terrestrial network-based communication method on the base station side based on instructions stored in the memory.

[0057] Some embodiments of this disclosure provide a user equipment including: a memory; and a processor coupled to the memory, the processor being configured to execute a non-terrestrial network-based communication method on the user equipment side based on instructions stored in the memory.

[0058] This disclosure provides some embodiments of a communication device based on a non-terrestrial network, comprising one or more modules that perform a communication method based on a non-terrestrial network.

[0059] This disclosure provides embodiments of a communication system based on a non-terrestrial network, including:

[0060] Core network equipment is configured to perform communication methods based on non-terrestrial networks on the core network side;

[0061] Base stations deployed on non-geostationary satellites are configured to perform communication methods based on non-terrestrial networks on the base station side;

[0062] User equipment is configured to perform communication methods based on non-terrestrial networks on the user equipment side.

[0063] Some embodiments of this disclosure propose a computer-readable storage medium having computer instructions stored thereon that, when executed by a processor, implement a communication method based on a non-terrestrial network.

[0064] Some embodiments of this disclosure provide a computer program product including computer instructions that, when executed by a processor, implement a communication method based on a non-terrestrial network. Attached Figure Description

[0065] The accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. This disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings.

[0066] Obviously, the accompanying drawings described below are merely some embodiments of this disclosure. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0067] Figure 1 This diagram illustrates the failure of RRC connection recovery for a user equipment in an NTN environment, based on the UE RRC connection recovery mechanism of a TN network.

[0068] Figure 2 The diagram illustrates a communication method based on a non-terrestrial network according to some embodiments of the present disclosure.

[0069] Figure 3 The diagram illustrates a communication method based on a non-terrestrial network according to some embodiments of the present disclosure.

[0070] Figure 4 A schematic diagram of a communication system based on a non-terrestrial network, according to some embodiments of the present disclosure, is shown.

[0071] Figure 5 A schematic diagram of a core network device according to some embodiments of this disclosure is shown.

[0072] Figure 6 A schematic diagram illustrating a base station deployed on a non-geostationary satellite according to some embodiments of the present disclosure is shown.

[0073] Figure 7 A schematic diagram of a user equipment according to some embodiments of this disclosure is shown.

[0074] Figure 8 A schematic diagram of a communication device based on a non-terrestrial network, according to some embodiments of the present disclosure, is shown. Detailed Implementation

[0075] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure.

[0076] Those skilled in the art will understand that the terms "first," "second," etc., in the embodiments of this disclosure are only used to distinguish different steps, devices, or modules, and do not represent any specific technical meaning, nor do they indicate a necessary logical order between them.

[0077] It should also be understood that in the embodiments disclosed herein, "a plurality of" may refer to two or more, and "at least one" may refer to one, two or more.

[0078] It should also be understood that any component, data or structure mentioned in the embodiments of this disclosure can generally be understood as one or more unless expressly defined or given to the contrary in the context.

[0079] Furthermore, the term "and / or" in this disclosure is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this disclosure generally indicates that the preceding and following related objects have an "or" relationship.

[0080] It should also be understood that the description of the various embodiments in this disclosure emphasizes the differences between the various embodiments, and the similarities or similarities can be referred to each other. For the sake of brevity, they will not be described in detail.

[0081] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0082] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0083] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0084] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0085] Furthermore, to avoid obscuring this disclosure with unnecessary detail, only processing steps and / or apparatus structures closely related to at least the solutions according to this disclosure are shown in the accompanying drawings, while other details not closely related to this disclosure are omitted. It should also be noted that similar reference numerals and letters in the drawings indicate similar items, and therefore once an item is defined in one drawing, it need not be discussed again in subsequent drawings.

[0086] Satellite-based base stations refer to base stations deployed on satellites. NGSO satellite-based base stations refer to base stations deployed on NGSO satellites.

[0087] The current UE RRC connection recovery mechanism designed for TN networks cannot well support the mobility of inactive UEs in NTN NGSO satellite base station scenarios. For example... Figure 1As shown, due to the potential unavailability of the inter-satellite link (ISL), the new NGSO satellite-based base station (SAT2) cannot obtain the user equipment's context from the original NGSO satellite-based base station (SAT1) and rejects the user equipment's RRC connection recovery request, resulting in RRC connection recovery failure and a poor user experience. If the UE establishes an RRC connection with a new NGSO satellite-based base station due to RRC connection recovery failure, the original NGSO satellite-based base station serving the UE may not be aware that the UE has connected to the new NGSO satellite-based base station and will continue to maintain the irrelevant context of the UE, resulting in wasted resources. If the original NGSO satellite-based base station serving the UE receives downlink data / signaling, it cannot send RAN (Radio Access Network) paging to other satellites when the inter-satellite link is unavailable, resulting in RAN paging failure. Due to RAN paging failure, the RAN network releases the UE context, and the UE has a different RRC state compared to the network, leading to inconsistent behavior. Even if an inter-satellite link exists for inactive UEs, the transmission latency of the inter-satellite link is relatively large, resulting in significant delays for user services.

[0088] To better support the mobility of inactive UEs in NTN NGSO satellite base station scenarios, this disclosure proposes a communication scheme based on a non-terrestrial network. This scheme relocates the context of the user equipment on the NGSO satellite base station side to the core network. When the inter-satellite link is unavailable, the inactive user equipment can restore network connectivity based on the context of the user equipment on the core network side.

[0089] Figure 2 Schematic diagrams illustrating communication methods based on non-terrestrial networks according to some embodiments of this disclosure are shown. For example... Figure 2 As shown, the communication method based on a non-terrestrial network in this embodiment includes the following steps.

[0090] In step 210, the first base station deployed on the first non-geostationary satellite sends a first request message (denoted as UE context relocationrequest) to the core network equipment for relocating the context of the user equipment to the core network. The first request message includes the context of the user equipment.

[0091] Among them, the first base station deployed on the first non-geostationary satellite is the NGSO satellite-borne base station currently serving user equipment.

[0092] In some embodiments, the first base station may, for example, relocate the context of the user equipment to the Access and Mobility Management Function (AMF) or other core network equipment responsible for the access and mobility management of the user equipment.

[0093] In step 220, in response to a first request message sent by a first base station deployed on a first non-geostationary satellite for relocating the context of a user equipment to the core network, the core network device determines whether to accept the context of the user equipment and sends a first response message (denoted as UE context relocationresponse) to the first base station to indicate whether to accept or reject the first request message. If the first request message is accepted, the core network device stores the context of the user equipment carried in the first request message and assigns a first identifier to uniquely identify the context of the user equipment in the core network. The first response message includes the first identifier.

[0094] In some embodiments, the first identifier may include, for example, the identification information of the core network device and the identification information of the user equipment. Thus, a new identifier for locating the context is formed by combining existing identifiers of the relevant devices. The components of this new identifier readily reveal the core network device stored in the context and the user equipment to which the context belongs. In other embodiments, a completely new identification method may be used to define the first identifier, as long as it serves to uniquely identify the context of the user equipment in the core network. The first identifier is a temporary identifier.

[0095] In step 230, the first base station sends a connection release message to the user equipment to trigger the user equipment to enter an inactive state. The connection release message is used to instruct the user equipment to release the connection and includes a first identifier.

[0096] A connection release message is, for example, an RRC connection release message, denoted as RRC Release.

[0097] In step 240, when the user equipment resumes connection from the inactive state, the user equipment sends a connection restoration request message to the second base station deployed on the second non-geostationary satellite. The connection restoration request message includes a first identifier.

[0098] The user equipment can resume connection from an inactive state either by the network side or by the user equipment side.

[0099] A connection recovery request message is, for example, an RRC connection recovery request message, denoted as RRC Resume Request.

[0100] In step 250, the second base station locates the context of the user equipment based on the first identifier in the connection restoration request message. If it is within the timer's validity period and the inter-satellite link is available, the context of the user equipment can be obtained through the NGSO satellite base station (first base station) (see steps 260-270). Otherwise, for example, if it is not within the timer's validity period or the inter-satellite link is unavailable, the context of the user equipment can be obtained through the core network (see steps 280-290).

[0101] In step 260, the second base station deployed on the second non-geostationary satellite sends a fourth request message to the first base station for obtaining the context of a user equipment. The fourth request message includes a first identifier. The first base station looks up the context of the user equipment corresponding to the first identifier and sends it to the second base station via a fourth response message of the fourth request message.

[0102] The fourth request message is denoted as UE context retrieve request, and the fourth response message of the fourth request message is denoted as UE context retrieve response.

[0103] In step 270, the second base station receives the fourth response message of the fourth request message sent by the first base station, and obtains the context of the user equipment corresponding to the first identifier from the fourth response message.

[0104] In step 280, the second base station deployed on the second non-geostationary satellite sends a second request message to the core network equipment for obtaining the context of a user equipment. The second request message includes a first identifier. In response to the second request message sent by the second base station deployed on the second non-geostationary satellite, the core network equipment locates the context of the user equipment corresponding to the first identifier and sends the context of the user equipment corresponding to the first identifier to the second base station via a second response message of the second request message.

[0105] The second request message is denoted as UE context retrieve request, and the second response message of the second request message is denoted as UE context retrieve response.

[0106] In step 290, the second base station receives the second response message of the second request message sent by the core network device, and obtains the context of the user equipment corresponding to the first identifier from the second response message.

[0107] In step 2100, the user equipment receives a connection restoration message sent by the second base station to restore the RRC connection. The connection restoration message includes a first identifier corresponding to the user equipment's context. This allows the user equipment to obtain its own context when resuming connection from an inactive state, thereby successfully restoring the connection.

[0108] The communication scheme based on non-terrestrial networks in this embodiment relocates the context of user equipment on the NGSO satellite base station side to the core network. When the inter-satellite link is unavailable, the inactive user equipment can restore the network connection based on the context of the user equipment on the core network side. When the inter-satellite link is available, the inactive user equipment can restore the network connection based on the context of the user equipment on the NGSO satellite base station side, thereby effectively supporting the mobility of inactive UEs in the NTN NGSO satellite base station scenario.

[0109] Figure 3 Schematic diagrams illustrating communication methods based on non-terrestrial networks according to some embodiments of this disclosure are shown. For example... Figure 3 As shown, the communication method based on a non-terrestrial network in this embodiment includes the following steps.

[0110] In step 310, the first base station deployed on the first non-geostationary satellite sends a first request message (denoted as UE context relocationrequest) to the core network equipment for relocating the context of the user equipment to the core network. The first request message includes the context of the user equipment.

[0111] Among them, the first base station deployed on the first non-geostationary satellite is the NGSO satellite-borne base station currently serving user equipment.

[0112] In some embodiments, the first base station may, for example, relocate the context of the user equipment to the Access and Mobility Management Function (AMF) or other core network equipment responsible for the access and mobility management of the user equipment.

[0113] In step 320, in response to a first request message sent by a first base station deployed on a first non-geostationary satellite for relocating the context of a user equipment to the core network, the core network device determines whether to accept the context of the user equipment and sends a first response message (denoted as UE context relocationresponse) to the first base station to indicate whether to accept or reject the first request message. If the first request message is accepted, the device stores the context of the user equipment carried in the first request message and assigns a first identifier to uniquely identify the context of the user equipment in the core network. The first response message includes the first identifier.

[0114] In some embodiments, the first identifier may include, for example, the identification information of the core network device and the identification information of the user equipment. Thus, a new identifier for locating the context is formed by combining existing identifiers of the relevant devices. The components of this new identifier readily reveal the core network device storing the context and the user equipment to which the context belongs. In other embodiments, a completely new identification method may be used to define the first identifier, as long as it serves to uniquely identify the context of the user equipment in the core network.

[0115] In step 330, the first base station sends a connection release message to the user equipment to trigger the user equipment to enter an inactive state. The connection release message is used to instruct the user equipment to release the connection and includes a first identifier.

[0116] A connection release message is, for example, an RRC connection release message, denoted as RRC Release.

[0117] In step 340, when the first base station leaves the current core network service area, the first base station sends a third request message to the core network device for removing the context of the user equipment. The third request message includes a first identifier. The core network device removes the context of the user equipment corresponding to the first identifier from the core network and sends a third response message to the third request message to the first base station.

[0118] The third request message is denoted as UE context Removalrequest, and the third response message of the third request message is denoted as UE context Removalresponse.

[0119] In step 350, the first base station receives a third response message to the third request message sent by the core network device. The third response message may, for example, indicate whether the user equipment context was successfully removed, or indicate successful receipt of the third request message. Subsequently, the first base station may also remove the stored user equipment context and disconnect from the core network.

[0120] In this embodiment, the non-terrestrial network-based communication scheme allows the NGSO satellite base station to relocate the context of user equipment to the core network or instruct the core network to remove the context of user equipment, depending on service needs.

[0121] The context of a user equipment includes, for example,: user equipment identification information; access layer context information; security configuration information; cell configuration information; user equipment capability information; and context validity period information.

[0122] User equipment (UE) identification information includes, for example, C-RNTI (Cell Radio Network Temporary Identifier) ​​and a unique temporary UE identifier (e.g., 5G-S-TMSI, S-TMSI). S-TMSI stands for Session-Temporary Mobile Subscriber Identity. C-RNTI uniquely identifies the UE within the cell. During downlink scheduling, the base station scrambles the PDCCH (Physical Downlink Control Channel) with C-RNTI to send control information to a specific UE. The UE uses its own C-RNTI to descramble the PDCCH to determine if the control information is intended for itself, thus enabling it to receive subsequent data. The unique temporary UE identifier is a temporary identifier assigned to the UE by the network. It identifies the UE within the network, protecting UE privacy and avoiding the use of permanent identifiers, such as IMSI (International Mobile Subscriber Identity), transmitted over the radio interface, reducing the risk of eavesdropping and tracking. During UE-network interaction, it is used to identify the UE and perform operations such as mobility management and paging.

[0123] Access layer context information consists of reserved UE access layer (AS) configuration parameters, including PDCP / RLC / MAC layer configuration parameters, PHY parameters (such as BWP configuration, measurement intervals, etc.), and radio bearer (DRB / SRB) configuration information. Specifically, PDCP stands for Packet Data Convergence Protocol, RLC for Radio Link Control, MAC for Medium Access Control, PHY for Physical Layer, BWP for Bandwidth Part, DRB for Data Radio Bearer, and SRB for Signaling Radio Bearer. PDCP / RLC / MAC Layer Configuration Parameters: PDCP layer configuration parameters control packet data aggregation protocols, such as header compression and encryption, to improve data transmission efficiency and security. RLC layer configuration parameters control the radio link control protocol, enabling data segmentation, reassembly, and retransmission to ensure reliable data transmission. MAC layer configuration parameters control media access, such as resource allocation and scheduling, allowing the UE to use radio resources efficiently for data transmission. PHY Parameters (e.g., BWP configuration, measurement gaps): BWP configuration parameters determine the bandwidth used by the UE within a specific time period, allowing the UE to flexibly transmit data on different bandwidth resources to adapt to different service requirements and radio environments. Measurement gap configuration reserves time intervals for the UE to perform neighbor cell measurements, enabling the UE to obtain signal quality information from surrounding cells in a timely manner, providing a basis for mobility management operations such as handover. Radio Bearer (DRB / SRB) Configuration Information: Defines relevant parameters for the data radio bearer (DRB) and signaling radio bearer (SRB), such as the bearer's Quality of Service (QoS) parameters and transmission format. DRBs are used to transmit user data. Different DRBs are configured with different parameters according to service type and QoS requirements to ensure the quality of data transmission. SRBs are used to transmit signaling data to ensure the reliability and timeliness of signaling interaction between the UE and the network.

[0124] Security configuration information consists of UE-related security keys and algorithms used to quickly restore a secure connection when the UE is reactivated. This includes, for example, currently active encryption algorithms (e.g., NR (New Radio) encryption algorithms NEA0 / 128-NEA1 / 128-NEA2 / 128-NEA3, LTE (Long Term Evolution) encryption algorithms EEA0 / 128-EEA1 / 128-EEA2 / 128-EEA3); integrity protection algorithms (e.g., NR algorithm 128-NIA1 / 128-NIA2 / 128-NIA3, LTE algorithm 128-EIA1 / 128-EIA2 / 128-EIA3); and key information such as KeNB* or KgNB derived keys. The currently active encryption algorithms are used to encrypt data transmitted between the UE and the network, converting plaintext data into ciphertext to prevent unauthorized interception and tampering during wireless transmission, thus protecting user data privacy and security. Different algorithms offer varying encryption strengths and performance to suit different security needs and network environments. Integrity protection algorithms verify the integrity of data during transmission. They generate integrity check codes through specific calculations, allowing the receiver to verify whether the data has been tampered with during transmission, ensuring data authenticity and integrity. Key information is crucial for encrypting and decrypting data and for integrity protection. The network and UE use these keys to generate the keys required for encryption and integrity protection algorithms, ensuring that only legitimate UEs and the network can perform data encryption and decryption operations, thus guaranteeing communication security.

[0125] Cell configuration information includes, for example, physical layer identifiers such as the Last Serving Cell PCI (Physical Cell Identifier) ​​and ARFCN (Absolute Radio Frequency Channel Number), the currently active BWP (Bandwidth Part) configuration, and SSB / SIB1 related parameters. SSB stands for Synchronization Signal Block, and SIB1 stands for System Information Block 1. The Last Serving Cell PCI and ARFCN are physical layer identifiers: PCI is used during cell search and synchronization to allow the UE to identify different cells and ensure a connection is established with the correct cell; ARFCN specifies the radio frequency resources used by the cell, and the UE tunes to the corresponding frequency for data transmission and reception based on the ARFCN. This identifier information helps the UE perform cell reselection and handover operations during movement. The currently active BWP configuration clarifies the bandwidth portion currently used by the UE. The UE can use this configuration to transmit and receive data on specific bandwidth resources. The network can dynamically adjust the BWP configuration based on the UE's service requirements and radio resource conditions, achieving flexible resource allocation and efficient utilization. SSB / SIB1 related parameters: SSB is used for UE synchronization and cell search processes, helping UE obtain cell synchronization information and system information; SIB1 contains basic cell configuration information, such as cell access parameters, public land mobile network identifier, etc. By receiving SIB1 related parameters, UE can understand the cell access conditions and system configuration in order to perform registration, access and other operations.

[0126] User equipment (UE) capability information includes, for example, a list of supported RF (Radio Frequency) bands, the maximum number of MIMO (Multiple-Input Multiple-Output) layers, supported coding types (such as QPSK / 16QAM / 64QAM / 256QAM capabilities), and dual connectivity capabilities. Here, QPSK stands for Quadrature Phase-Shift Keying, and QAM stands for Quadrature Amplitude Modulation. The RF supported band list informs the network of the radio bands supported by the UE. The network can allocate appropriate frequency resources based on these bands to ensure the UE can transmit and receive data on supported bands. This also helps the network with frequency planning and resource allocation, improving spectrum utilization. The maximum number of MIMO layers indicates the maximum number of multiple-input multiple-output (MIMO) layers the UE can support. MIMO technology allows multiple antennas to transmit data simultaneously, improving data transmission rate and reliability. The network can determine the MIMO resources allocated to the UE based on its maximum number of MIMO layers to achieve optimal transmission performance. Supported coding types (e.g., QPSK / 16QAM / 64QAM / 256QAM capabilities): Different coding types have different modulation methods and data transmission efficiencies. The coding types supported by the UE determine its ability to use appropriate coding methods for data transmission under different radio channel conditions. The network can select an appropriate coding type based on the radio channel quality and the UE's coding capabilities to achieve efficient data transmission. Dual connectivity capability: This indicates whether the UE supports simultaneous connection to two different base stations or networks, enabling dual connectivity. UEs with dual connectivity capability can utilize the resources of two networks simultaneously, improving data transmission rates, enhancing network coverage and reliability. The network can configure a dual connectivity mode for the UE based on its dual connectivity capability to meet users' needs for high-speed and high-reliability services.

[0127] Context validity information includes, for example, a UE inactive timer and a context retention timer. The UE inactive timer controls the duration of the UE's inactive state. It starts counting down when the UE has not engaged in data transmission or other activities for a period of time. After the timer expires, the network may release some UE-related resources to conserve network resources, but it will retain the UE context information so that the UE can quickly reactivate when needed. The context retention timer specifies the maximum time the network will retain the UE context information. Before the timer expires, even if the UE is in an inactive state for a long time, the network will retain its context information so that the UE can quickly restore the connection. After the timer expires, the network will delete the UE context information, release related resources, and the UE will need to go through registration and other processes to reconnect to the network.

[0128] The connection release message includes the context of the user equipment, and may also include: user equipment identification information; Radio Access Network Notification Area (RNA) configuration information; periodic RNA update timer; security configuration information; radio resource configuration information; measurement configuration information; and auxiliary parameters.

[0129] User equipment (UE) identification information includes, for example, an I-RNTI (Inactive-Radio Network Temporary Identifier) ​​and a timer, serving as the primary identifier for the UE context. The I-RNTI is a temporary identifier assigned by the network to a UE in an inactive state. After connection release, the network can quickly and accurately identify and locate a specific UE using the I-RNTI when needed, facilitating signaling interactions or data transmission, without requiring complex and lengthy identifiers like the IMSI, thus improving signaling efficiency. The timer specifies the time limit for the connection release process. After the connection release message is sent, the timer starts counting down, ensuring that the network and UE complete the relevant connection release operations, such as resource release and signaling interaction, within the specified time, avoiding resource waste or signaling confusion due to prolonged waiting by one party.

[0130] The Radio Access Network Notification Area (RNA) configuration information is as follows: An RNA is an area composed of multiple cells. When a UE moves within this area, it does not need to update its location; it only needs to notify the network when it leaves the area. This reduces signaling overhead and improves paging efficiency. The RNA configuration information includes the specific definition of the area, such as which cells it contains.

[0131] A periodic RNA update timer, such as t380, is used to control the UE to periodically send RNA update messages to the network. When the timer expires, the UE will proactively send a message to the network informing it of its current RNA location, ensuring that the network can periodically obtain the UE's location information. This helps maintain state synchronization between the network and the UE and prevents inconsistencies caused by prolonged periods without updated location information.

[0132] Security configuration information includes details related to communication security between the UE and the network, such as encryption algorithms, integrity protection algorithms, and corresponding keys. Data confidentiality: Encryption algorithms are used to encrypt data transmitted between the UE and the network, preventing data theft or eavesdropping during wireless transmission and protecting user privacy and data security. Data integrity: Integrity protection algorithms are used to verify data, ensuring that it has not been tampered with during transmission and guaranteeing its authenticity and reliability. Authentication: A key is used for authentication between the UE and the network; only parties with the correct key can communicate, preventing unauthorized users from accessing the network.

[0133] Radio resource configuration information defines the radio resources that the UE can use in subsequent communication, such as frequency bands, bandwidth, and transmit power. This allows for the allocation of appropriate radio resources to the UE based on its capabilities and the current radio environment, ensuring that the UE can communicate within the available resource range.

[0134] Measurement configuration information includes the measurement tasks the UE needs to perform and related measurement parameters, such as the measurement object (e.g., neighboring cells), measurement frequency, and triggering conditions for measurement reports. This information can be used for cell selection and handover, and network optimization. Cell selection and handover: By measuring neighboring cells, the UE can assess the signal quality of different cells, providing a basis for cell selection and handover. When the signal quality of the currently serving cell deteriorates, the UE can promptly switch to a cell with better signal quality based on the measurement results, ensuring communication continuity and stability. Network optimization: Measurement reports can be fed back to the network, helping it manage and optimize radio resources, such as adjusting cell transmit power and optimizing cell coverage, thereby improving the overall network performance.

[0135] The auxiliary parameter, ResumeIdentity, is a temporary identifier used to identify the UE when it reconnects, enabling rapid connection restoration. When a UE needs to re-establish a connection, ResumeIdentity allows the network to quickly identify the UE's identity and previous context information, thus rapidly restoring the connection and reducing connection establishment time and signaling overhead. Information related to network slicing includes the identifier of the network slice to which the UE belongs and related configuration information. Network slicing is a technology that divides a physical network into multiple virtual networks, each slice meeting different service requirements. Network slicing technology enables service isolation and customization, as well as network resource optimization.

[0136] Figure 4 Schematic diagrams of communication systems based on non-terrestrial networks, representing some embodiments of this disclosure, are shown. For example... Figure 4 As shown, the communication system 400 based on a non-terrestrial network includes: a core network device 410, a base station 420 deployed on a non-geostationary satellite, and user equipment 430. The core network device 410 is configured to perform a communication method based on a non-terrestrial network on the core network side; the base station 420 deployed on a non-geostationary satellite is configured to perform a communication method based on a non-terrestrial network on the base station side; and the user equipment 430 is configured to perform a communication method based on a non-terrestrial network on the user equipment side.

[0137] Communication methods based on non-terrestrial networks on the core network side include, for example, the following.

[0138] Example (1), a communication method based on a non-terrestrial network, applied to core network equipment, includes:

[0139] In response to a first request message sent by a first base station deployed on a first non-geostationary satellite for relocating the context of a user equipment to the core network, the context of the user equipment carried in the first request message is stored, and a first identifier is assigned to uniquely identify the context of the user equipment in the core network.

[0140] In response to a second request message sent by a second base station deployed on a second non-geostationary satellite for obtaining the context of a user equipment, the second request message including the first identifier, the context of the user equipment corresponding to the first identifier is sent to the second base station.

[0141] In embodiment (2), based on embodiment (1), the communication method further includes: sending a first response message to the first base station to indicate acceptance or rejection of the first request message, wherein if the first request message is accepted, the first response message includes the first identifier.

[0142] In embodiment (3), based on embodiment (2), the second request message is sent by the second base station in response to the connection restoration request message of the user equipment, and the connection restoration request message of the user equipment includes the first identifier obtained by the user equipment from the first base station.

[0143] In embodiment (4), based on embodiment (3), the connection restoration request message of the user equipment includes the first identifier obtained by the user equipment from the connection release message of the first base station, and the connection release message is used to instruct the user equipment to release the connection.

[0144] In embodiment (5), based on embodiments (1)-(4), the communication method further includes: in response to a third request message sent by the first base station for removing the context of a user equipment, the third request message including the first identifier, removing the context of the user equipment corresponding to the first identifier from the core network; and sending a third response message of the third request message to the first base station.

[0145] In embodiment (6), based on embodiments (1)-(4), the communication method further includes: after sending the context of the user equipment corresponding to the first identifier to the second base station, removing the context of the user equipment corresponding to the first identifier from the core network.

[0146] Communication methods based on non-terrestrial networks at the base station side include, for example, the following.

[0147] Example (7), a communication method based on a non-terrestrial network, applied to a base station deployed on a non-geostationary satellite, includes:

[0148] The first base station deployed on the first non-geostationary satellite sends a first request message to the core network equipment to relocate the context of the user equipment to the core network.

[0149] The first base station receives a first response message from the core network device that is a first request message, which is used to indicate whether to accept or reject the first request message. If the first request message is accepted, the first response message includes a first identifier for uniquely identifying the context of the user equipment in the core network.

[0150] A second base station deployed on a second non-geostationary satellite sends a second request message to the core network equipment for obtaining the context of the user equipment, the second request message including the first identifier;

[0151] The second base station receives a second response message from the second request message sent by the core network device, and obtains the context of the user equipment corresponding to the first identifier from the second response message.

[0152] In embodiment (8), based on embodiment (7), the communication method further includes: the first base station sending a connection release message to the user equipment, the connection release message being used to instruct the user equipment to release the connection, the connection release message including the first identifier.

[0153] In Example (9), based on Example (8), the second base station sends a second request message to the core network device to obtain the context of the user equipment, which includes: the second base station responds to the connection restoration request message of the user equipment and sends a second request message to the core network device to obtain the context of the user equipment, wherein the connection restoration request message of the user equipment includes the first identifier.

[0154] In Example (10), based on Example (7), the second base station sends a second request message to the core network device to obtain the context of the user equipment, including: when the inter-satellite link is unavailable, the second base station sends a second request message to the core network device to obtain the context of the user equipment.

[0155] In Example (11), based on Example (7), the communication method further includes: the first base station sending a third request message to the core network device for removing the context of the user equipment, the third request message including the first identifier; and the first base station receiving a third response message of the third request message sent by the core network device.

[0156] In Example (12), based on Example (7), the communication method further includes: when the inter-satellite link is available, the second base station sends a fourth request message to the first base station for obtaining the context of the user equipment, the fourth request message including the first identifier; the second base station receives a fourth response message of the fourth request message sent by the first base station, and obtains the context of the user equipment corresponding to the first identifier from the fourth response message.

[0157] Communication methods based on non-terrestrial networks on the user equipment side include, for example, the following.

[0158] Example (13), a communication method based on a non-terrestrial network, applied to a user equipment, includes:

[0159] Receive a connection release message sent by a first base station deployed on a first non-geostationary satellite, which instructs a user equipment to release a connection. The connection release message includes a first identifier, which is used to uniquely identify the context of the user equipment in the core network.

[0160] Send a connection restoration request message to a second base station deployed on a second non-geosynchronous satellite, the connection restoration request message including the first identifier;

[0161] The system receives a connection restoration message sent by the second base station, the connection restoration message including the context of the user equipment corresponding to the first identifier.

[0162] In Example (14), based on Example (13), the connection restoration message includes the context of the user equipment corresponding to the first identifier obtained by the second base station from the core network equipment or the first base station.

[0163] Figure 5 Schematic diagrams of core network devices according to some embodiments of this disclosure are shown. For example... Figure 5 As shown, the core network device 410 includes a memory 510 and a processor 520 coupled to the memory 510. The processor 520 is configured to execute communication methods based on non-terrestrial networks on the core network device side of any of the foregoing embodiments, based on instructions stored in the memory 510. See the foregoing for details, which will not be repeated here.

[0164] The core network device 410 may also include input / output interfaces 530, network interfaces 540, storage interfaces 550, etc. These interfaces 530, 540, 550, as well as the memory 510 and the processor 520, can be connected, for example, via a bus 560.

[0165] Figure 6 A schematic diagram illustrating a base station deployed on a non-geostationary satellite, representing some embodiments of this disclosure. For example... Figure 6 As shown, the base station 420 deployed on a non-geostationary satellite includes a memory 610 and a processor 620 coupled to the memory 610. The processor 620 is configured to execute, based on instructions stored in the memory 610, the communication methods based on non-terrestrial networks deployed on the base station side of the non-geostationary satellite as described in any of the foregoing embodiments. See the foregoing for details, which will not be repeated here.

[0166] The base station 420 deployed on a non-geostationary satellite may also include an input / output interface 630, a network interface 640, a storage interface 650, etc. These interfaces 630, 640, 650, as well as the memory 610 and the processor 620, can be connected, for example, via a bus 660.

[0167] Figure 7 A schematic diagram of a user equipment according to some embodiments of this disclosure is shown. For example... Figure 7As shown, user equipment 430 includes a memory 710 and a processor 720 coupled to the memory 710. The processor 720 is configured to execute, based on instructions stored in the memory 710, the user equipment-side communication method based on a non-terrestrial network in any of the foregoing embodiments. See the foregoing for details, which will not be repeated here.

[0168] User equipment 430 may also include input / output interface 730, network interface 740, storage interface 750, etc. These interfaces 730, 740, 750, as well as memory 710 and processor 720, can be connected, for example, via bus 760.

[0169] The memories 510, 610, and 710 may include, for example, system memory, fixed non-volatile storage media, etc. The system memory may store, for example, the operating system, application programs, boot loader, and other programs.

[0170] Among them, processors 520, 620, and 720 can be implemented using general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete hardware components such as discrete gates or transistors.

[0171] The input / output interfaces 530, 630, and 730 provide connection interfaces for input / output devices such as monitors, mice, keyboards, and touchscreens. Network interfaces 540, 640, and 740 provide connection interfaces for various networked devices. Storage interfaces 550, 650, and 750 provide connection interfaces for external storage devices such as SD cards and USB flash drives. Buses 560, 660, and 760 can use any of the various bus architectures available. For example, bus architectures include, but are not limited to, Industry Standard Architecture (ISA) buses, Micro Channel Architecture (MCA) buses, and Peripheral Component Interconnect (PCI) buses.

[0172] Figure 8 Schematic diagrams of communication devices based on non-terrestrial networks, representing some embodiments of this disclosure, are shown. For example... Figure 8 As shown, the non-terrestrial network-based communication device 800 includes one or more modules that perform a non-terrestrial network-based communication method.

[0173] Core network device module 810 is configured to perform communication methods on the core network side based on non-terrestrial networks.

[0174] The base station module 820, deployed on a non-geostationary satellite, is configured to perform communication methods based on non-terrestrial networks on the base station side.

[0175] User equipment module 830 is configured to perform communication methods on the user equipment side based on non-terrestrial networks.

[0176] Each module 810, 820, and 830 can be further divided into one or more sub-modules as needed.

[0177] The various embodiments of this disclosure propose user equipment connection recovery schemes that support non-terrestrial network scenarios. These schemes relocate the context of user equipment on the NGSO satellite base station side to the core network. In the event that the inter-satellite link is unavailable, inactive user equipment can recover network connection based on the context of user equipment on the core network side.

[0178] Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, systems, or computer program products. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product embodied on one or more (non-transitory) computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, cloud storage, etc.) containing computer program code. A computer program product should be understood as a software product that primarily implements its solution through a computer program.

[0179] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0180] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0181] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

Claims

1. A communication method based on a non-terrestrial network, applied to core network equipment, comprising: In response to a first request message sent by a first base station deployed on a first non-geostationary satellite for relocating the context of a user equipment to the core network, the context of the user equipment carried in the first request message is stored, and a first identifier is assigned to uniquely identify the context of the user equipment in the core network. In response to a second request message sent by a second base station deployed on a second non-geostationary satellite for obtaining the context of a user equipment, the second request message including the first identifier, the context of the user equipment corresponding to the first identifier is sent to the second base station.

2. The communication method according to claim 1 further includes: A first response message is sent to the first base station to indicate whether the first request message is accepted or rejected. If the first request message is accepted, the first response message includes the first identifier.

3. The communication method according to claim 2, wherein, The second request message is sent by the second base station in response to the connection restoration request message of the user equipment, and the connection restoration request message of the user equipment includes the first identifier obtained by the user equipment from the first base station.

4. The communication method according to claim 3, wherein, The connection restoration request message of the user equipment includes the first identifier obtained by the user equipment from the connection release message of the first base station, and the connection release message is used to instruct the user equipment to release the connection.

5. The communication method according to claim 1, further comprising: In response to a third request message sent by the first base station for removing the context of a user equipment, the third request message including the first identifier, the context of the user equipment corresponding to the first identifier is removed from the core network; Send a third response message to the first base station for the third request message.

6. The communication method according to claim 1, further comprising: After sending the context of the user equipment corresponding to the first identifier to the second base station, the context of the user equipment corresponding to the first identifier is removed from the core network.

7. A communication method based on a non-terrestrial network, applied to a base station deployed on a non-geostationary satellite, comprising: The first base station deployed on the first non-geostationary satellite sends a first request message to the core network equipment to relocate the context of the user equipment to the core network. The first base station receives a first response message from the core network device that is a first request message, which is used to indicate whether to accept or reject the first request message. If the first request message is accepted, the first response message includes a first identifier for uniquely identifying the context of the user equipment in the core network. A second base station deployed on a second non-geostationary satellite sends a second request message to the core network equipment for obtaining the context of the user equipment, the second request message including the first identifier; The second base station receives a second response message from the second request message sent by the core network device, and obtains the context of the user equipment corresponding to the first identifier from the second response message.

8. The communication method according to claim 7, further comprising: The first base station sends a connection release message to the user equipment, the connection release message being used to instruct the user equipment to release the connection, the connection release message including the first identifier.

9. The communication method according to claim 8, wherein, The second base station sends a second request message to the core network equipment to obtain the context of the user equipment, including: In response to the connection restoration request message from the user equipment, the second base station sends a second request message to the core network device for obtaining the context of the user equipment, wherein the connection restoration request message from the user equipment includes the first identifier.

10. The communication method according to claim 7, wherein, The second base station sends a second request message to the core network equipment to obtain the context of the user equipment, including: When the inter-satellite link is unavailable, the second base station sends a second request message to the core network equipment to obtain the context of the user equipment.

11. The communication method according to claim 7, further comprising: The first base station sends a third request message to the core network device for removing the context of the user equipment, the third request message including the first identifier; The first base station receives the third response message of the third request message sent by the core network device.

12. The communication method according to claim 7, further comprising: When the inter-satellite link is available, the second base station sends a fourth request message to the first base station for obtaining the context of the user equipment, the fourth request message including the first identifier; The second base station receives the fourth response message of the fourth request message sent by the first base station, and obtains the context of the user equipment corresponding to the first identifier from the fourth response message.

13. A communication method based on a non-terrestrial network, applied to user equipment, comprising: Receive a connection release message sent by a first base station deployed on a first non-geostationary satellite, which instructs a user equipment to release a connection. The connection release message includes a first identifier, which is used to uniquely identify the context of the user equipment in the core network. Send a connection restoration request message to a second base station deployed on a second non-geosynchronous satellite, the connection restoration request message including the first identifier; The system receives a connection restoration message sent by the second base station, the connection restoration message including the context of the user equipment corresponding to the first identifier.

14. The communication method according to claim 13, wherein, The connection restoration message includes the context of the user equipment corresponding to the first identifier obtained by the second base station from the core network equipment or the first base station.

15. The communication method according to any one of claims 1-14, wherein, The first identifier includes the identification information of the core network equipment and the identification information of the user equipment.

16. The communication method according to any one of claims 1-14, wherein, The context of the user equipment includes at least one of the following: The identification information of the user equipment; Access layer context information; Security configuration information; Community configuration information; The capability information of the user equipment; Context validity information.

17. The communication method according to any one of claims 4, 8, and 13, wherein, The connection release message also includes at least one of the following: The identification information of the user equipment; Radio access network notification area RNA configuration information; Periodic RNA update timer; Security configuration information; Wireless resource configuration information; Measurement configuration information; Auxiliary parameters.

18. A core network device, comprising: Memory; And a processor coupled to the memory, the processor being configured to execute the communication method based on any one of claims 1-6, 15-17 based on instructions stored in the memory.

19. A base station deployed on a non-geostationary satellite, comprising: Memory; And a processor coupled to the memory, the processor being configured to execute the communication method based on any one of claims 7-12, 15-17 based on instructions stored in the memory.

20. A user equipment, comprising: Memory; And a processor coupled to the memory, the processor being configured to execute the communication method based on any one of claims 13-17 based on instructions stored in the memory.

21. A communication device based on a non-terrestrial network, comprising: One or more modules that implement the communication method based on a non-terrestrial network according to any one of claims 1-17.

22. A communication system based on a non-terrestrial network, comprising: The core network equipment is configured to perform the communication method based on a non-terrestrial network as described in any one of claims 1-6 and 15-17; A base station deployed on a non-geostationary satellite is configured to perform the communication method based on a non-terrestrial network as described in any one of claims 7-12 and 15-17; The user equipment is configured to perform the communication method based on a non-terrestrial network as described in any one of claims 13-17.

23. A computer-readable storage medium having stored thereon computer instructions that, when executed by a processor, implement the communication method based on a non-terrestrial network as described in any one of claims 1-17.

24. A computer program product comprising computer instructions that, when executed by a processor, implement the communication method based on a non-terrestrial network as described in any one of claims 1-17.

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