Connection management method, terminal and access network equipment

Abstract

The invention discloses a connection management method, a terminal and access network equipment, and belongs to the technical field of communication, and the connection management method comprises the following steps: when a service link between the terminal and first access network equipment is unavailable, the first access network equipment is connected with the terminal; the terminal executes any one of the following connection management operations: keeping an air interface connection with the first access network device; hanging the air interface connection; releasing the air interface connection with the first access network equipment; under the condition that the service link is available, the terminal executes at least one of the following connection management operations: recovering data transmission with the first access network equipment; recovering air interface connection; and reestablishing the air interface connection with the first access network equipment.

Description

Technical Field

[0001] This application belongs to the field of communication technologies, and particularly relates to a connection management method, a terminal, and an access network device. Background Art

[0002] In the existing mechanism, when a terminal and a core network element exchange signaling or service data, it is necessary to ensure that the link between the terminal and the base station and the link between the base station and the core network element are both connected.

[0003] In the Store and forward (S&F) mechanism, during the data transmission between the terminal and the core network element, the service link will experience multiple processes of service link available, service link unavailable, service link available... That is, the state of the service link will change multiple times. Therefore, in the S&F mechanism, how to manage the air interface connection to ensure normal data transmission is an urgent problem to be solved. Summary of the Invention

[0004] Embodiments of this application provide a connection management method, which can solve the problem that data transmission cannot be carried out normally in the S&F mechanism.

[0005] In a first aspect, a connection management method is provided, which is executed by a terminal. The method includes:

[0006] When the service link between the terminal and the first access network device is unavailable, the terminal performs any one of the following connection management operations:

[0007] Maintain the air interface connection with the first access network device;

[0008] Suspend the air interface connection;

[0009] Release the air interface connection with the first access network device;

[0010] When the service link is available, the terminal performs at least one of the following connection management operations:

[0011] Resume data transmission with the first access network device;

[0012] Resume the air interface connection;

[0013] Re-establish the air interface connection with the first access network device.

[0014] In a second aspect, a connection management method is provided, which is executed by an access network device. The method includes:

[0015] When the service link between the first access network device and the terminal is unavailable, the first access network device performs any one of the following connection management operations:

[0016] Maintain the radio link connection with the terminal;

[0017] Suspend the radio link connection;

[0018] Release the radio link connection with the terminal;

[0019] When the service link is available, the first access network device performs at least one of the following connection management operations:

[0020] Resume data transmission with the terminal;

[0021] Resume the radio link connection;

[0022] Re - establish the radio link connection with the terminal.

[0023] Thirdly, a connection management apparatus is provided, including:

[0024] A first execution module, configured to perform any one of the following connection management operations when the service link between it and the first access network device is unavailable:

[0025] Maintain the radio link connection with the first access network device;

[0026] Suspend the radio link connection;

[0027] Release the radio link connection with the first access network device;

[0028] When the service link is available, perform at least one of the following connection management operations:

[0029] Resume data transmission with the first access network device;

[0030] Resume the radio link connection;

[0031] Re - establish the radio link connection with the first access network device.

[0032] Fourthly, a connection management apparatus is provided, including:

[0033] A second execution module, configured to perform any one of the following connection management operations when the service link between it and the terminal is unavailable:

[0034] Maintain the radio link connection with the terminal;

[0035] Suspend the radio link connection;

[0036] Release the radio link connection with the terminal;

[0037] When the service link is available, perform at least one of the following connection management operations:

[0038] Resume data transmission with the terminal;

[0039] Restore the radio link connection;

[0040] Re - establish the radio link connection with the terminal.

[0041] In a fifth aspect, a terminal is provided. The terminal includes a processor and a memory. The memory stores a program or instructions that can be run on the processor. When the program or instructions are executed by the processor, the steps of the method described in the first aspect are implemented.

[0042] In a sixth aspect, a terminal is provided, including a processor and a communication interface. Wherein, the processor is used to perform any one of the following connection management operations when the service link with the first access network device is unavailable:

[0043] Maintain the radio link connection with the first access network device;

[0044] Suspend the radio link connection;

[0045] Release the radio link connection with the first access network device;

[0046] When the service link is available, perform at least one of the following connection management operations:

[0047] Restore data transmission with the first access network device;

[0048] Restore the radio link connection;

[0049] Re - establish the radio link connection with the first access network device.

[0050] In a seventh aspect, an access network device is provided. The access network device includes a processor and a memory. The memory stores a program or instructions that can be run on the processor. When the program or instructions are executed by the processor, the steps of the method described in the second aspect are implemented.

[0051] In an eighth aspect, an access network device is provided, including a processor and a communication interface. Wherein, the processor is used to perform any one of the following connection management operations when the service link with the terminal is unavailable:

[0052] Maintain the radio link connection with the terminal;

[0053] Suspend the radio link connection;

[0054] Release the radio link connection with the terminal;

[0055] When the service link is available, perform at least one of the following connection management operations:

[0056] Restore data transmission with the terminal;

[0057] Restore the radio link connection;

[0058] Re - establish an air - interface connection with the terminal.

[0059] In a ninth aspect, a readable storage medium is provided. Programs or instructions are stored on the readable storage medium, and when the programs or instructions are executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented.

[0060] In a tenth aspect, a wireless communication system is provided, including: a terminal and a network - side device. The terminal can be used to execute the steps of the method described in the first aspect, and the access network device can be used to execute the steps of the method described in the second aspect.

[0061] In an eleventh aspect, a chip is provided. The chip includes a processor and a communication interface. The communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the method described in the first aspect or the method described in the second aspect.

[0062] In a twelfth aspect, a computer program / program product is provided. The computer program / program product is stored in a storage medium, and the program / program product is executed by at least one processor to implement the method described in the first aspect or the method described in the second aspect.

[0063] In the embodiments of the present application, under the S&F mechanism, the state of the service link changes multiple times. In the embodiments of the present application, through air - interface connection management, when the service link between the terminal and the first access network device is unavailable, the terminal can release the air - interface connection with the first access network device, or can still maintain the air - interface connection with the first access network device; when the service link changes from unavailable to available, the terminal can directly resume data transmission with the first access network device, or achieve data transmission with the first access network device by re - establishing the air - interface connection with the first access network device, that is, normal data transmission under the S&F mechanism is achieved based on effective connection management, and the problem of abnormal data transmission under the S&F mechanism is solved. Description of the Drawings

[0064] Figure 1 is a schematic diagram of a wireless communication system to which the embodiments of the present application can be applied;

[0065] Figure 2 is a schematic diagram of a non - terrestrial network to which the embodiments of the present application can be applied;

[0066] Figure 3 is a schematic diagram of a satellite communication system provided by the embodiments of the present application;

[0067] Figure 4It is a schematic diagram of a satellite communication system based on store-and-forward provided by an embodiment of the present application;

[0068] Figure 5 It is one of the schematic flowcharts of the connection management method provided by an embodiment of the present application;

[0069] Figure 6 It is the second schematic flowchart of the connection management method provided by an embodiment of the present application;

[0070] Figure 7 It is one of the schematic interaction flowcharts of the connection management method provided by an embodiment of the present application;

[0071] Figure 8 It is the second schematic interaction flowchart of the connection management method provided by an embodiment of the present application;

[0072] Figure 9 It is the third schematic interaction flowchart of the connection management method provided by an embodiment of the present application;

[0073] Figure 10 It is the fourth schematic interaction flowchart of the connection management method provided by an embodiment of the present application;

[0074] Figure 11 It is the fifth schematic interaction flowchart of the connection management method provided by an embodiment of the present application;

[0075] Figure 12 It is one of the schematic structural diagrams of the connection management device provided by an embodiment of the present application;

[0076] Figure 13 It is the second schematic structural diagram of the connection management device provided by an embodiment of the present application;

[0077] Figure 14 It is the schematic structural diagram of the communication device provided by an embodiment of the present application;

[0078] Figure 15 It is the schematic structural diagram of the terminal provided by an embodiment of the present application;

[0079] Figure 16 It is the schematic structural diagram of the access network device provided by an embodiment of the present application. Detailed implementation manners

[0080] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope protected by the present application.

[0081] The terms "first", "second", etc. in this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, so that the embodiments of this application can be implemented in an order other than those illustrated or described herein. The objects distinguished by "first" and "second" are generally of the same category, and do not limit the number of objects. For example, the first object can be one or multiple. In addition, "or" in this application means at least one of the connected objects. For example, "A or B" covers three scenarios, namely, Scenario 1: including A and not including B; Scenario 2: including B and not including A; Scenario 3: including both A and B. The character " / " generally indicates that the related objects before and after are in an "or" relationship.

[0082] The term "indication" in this application can be either a direct indication (or an explicit indication) or an indirect indication (or an implicit indication). Among them, a direct indication can be understood as that the sender clearly informs the receiver of specific information, operations to be performed, or request results, etc. in the sent indication; an indirect indication can be understood as that the receiver determines the corresponding information according to the indication sent by the sender, or makes a judgment and determines the operations to be performed or request results, etc. according to the judgment result.

[0083] It is worth noting that the technology described in the embodiments of this application is not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, and can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), or other systems. The terms "system" and "network" in the embodiments of this application are often used interchangeably. The described technology can be used not only in the systems and radio technologies mentioned above, but also in other systems and radio technologies. The following description describes the New Radio (NR) system for example purposes, and uses NR terms in most of the following descriptions, but these technologies can also be applied to systems other than the NR system, such as the 6th generation (6 thGeneration, 6G) communication system.

[0084] Figure 1The block diagram of a wireless communication system to which embodiments of the present application can be applied is shown. The wireless communication system includes a terminal 11 and a network-side device 12. Among them, the terminal 11 can be a mobile phone, a tablet personal computer, a laptop computer, a notebook computer, a personal digital assistant (PDA), a handheld computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), an augmented reality (AR), a virtual reality (VR) device, a robot, a wearable device, a flight vehicle, a vehicle user equipment (VUE), a shipborne device, a pedestrian user equipment (PUE), a smart home (home appliances with wireless communication functions, such as refrigerators, TVs, washing machines, or furniture, etc.), a game console, a personal computer (PC), a teller machine, or a self-service machine, etc., terminal-side devices. Wearable devices include: smart watches, smart bracelets, smart earphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart ankle chains, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle user equipment can also be called a vehicle terminal, a vehicle controller, a vehicle module, a vehicle component, a vehicle chip, or a vehicle unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiments of the present application. The network-side device 12 can include an access network device or a core network device. Among them, the access network device can also be called a radio access network (RAN) device, a radio access network function, or a radio access network unit. The access network device can include a base station, a wireless local area network (WLAN) access point (AP), or a wireless fidelity (WiFi) node, etc.Among them, the base station can be referred to as Node B (NB), Evolved Node B (eNB), the next generation Node B (gNB), New Radio Node B (NR Node B), access point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), home Node B (HNB), home evolved Node B, Transmission Reception Point (TRP), on - satellite access network device, the Centralized Unit (CU) of the on - satellite access network device, the Distributed Unit (DU) of the on - satellite access network device, the CU of the on - satellite access network device, the DU of the on - satellite access network device, or some other suitable term in the field. As long as the same technical effect is achieved, the base station is not limited to specific technical terms. It should be noted that in the embodiments of this application, only the base station in the NR system is taken as an example for introduction, and the specific type of the base station is not limited.

[0085] The core network device may include, but is not limited to, at least one of the following: core network nodes, core network functions, Mobility Management Entity (MME), Access and Mobility Management Function (AMF), Session Management Function (SMF), User Plane Function (UPF), Policy Control Function (PCF), Policy and Charging Rules Function (PCRF), Edge Application Server Discovery Function (EASDF), Unified Data Management (UDM), Unified Data Repository (UDR), Home Subscriber Server (HSS), Centralized network configuration (CNC), Network Repository Function (NRF), Network Exposure Function (NEF), Local NEF (L-NEF), Binding Support Function (BSF), Application Function (AF), etc. It should be noted that in the embodiments of this application, only the core network devices in the NR system are taken as examples for introduction, and the specific types of core network devices are not limited.

[0086] To facilitate a clearer understanding of the technical solutions provided by the embodiments of this application, some relevant background knowledge is introduced as follows.

[0087] I. Introduction to NTN (Non-terrestrial networks);

[0088] Figure 2 It is a schematic diagram of a typical NTN deployment scenario in the related art, such as Figure 2As shown, the link between the user equipment (UE) and the satellite is called the service link (i.e., service link), and can also be called the feeder link. The link between the satellite and the terrestrial gateway is called the feeder link (i.e., feeder link). In some scenarios (such as low Earth orbit satellites LEO), due to satellite movement, handovers of the service link and / or feeder link may occur. For service link handover, the serving satellite for all terminals within a cell needs to be switched from one satellite to another. For feeder link handover, a certain satellite needs to be switched from one terrestrial gateway to another terrestrial gateway.

[0089] The NTN communication system includes two types: the NTN communication system based on transparent payload and the NTN communication system based on regenerative payload. In the 3rd Generation Partnership Project (3GPP) Releases 17 and 18, only the NTN communication system based on transparent payload is considered. In this deployment environment, the terminals, base stations, and core network devices are all deployed on the ground, and the communication data between the terminals and the network devices is relayed via the satellite in the air. In this system, the satellite is only used to forward the data between the base station and the terminal, and does not decode and process this data. For the NTN communication system based on regenerative payload, the satellite has some or all of the base station functions and can decode and process the uplink or downlink data. Exemplarily, if the satellite has all the functions of the access network, the access network device can be called the on-satellite access network device or the on-satellite base station device. In popular terms, it can also be called the base station on the satellite. In this case, the central unit CU function of the access network is called the on-satellite access network CU, and the DU function of the access network is called the distributed unit DU of the on-satellite access network. If the satellite has the central unit CU function of the access network, the central unit CU of the access network can be called the on-satellite CU of the access network device. In popular terms, it can also be called the CU on the satellite. If the satellite has the DU function of the access network, the DU of the access network can be called the on-satellite DU of the access network device. In popular terms, it can also be called the DU on the satellite.

[0090] II. Introduction to S&F (Store and forward);

[0091] Figure 3 is a schematic diagram of a normal / default satellite communication system in the related art, such as Figure 3 As shown, in the NTN communication system, to achieve data or signaling interaction between the terminal and the terrestrial network, it is necessary to ensure that the service link and the feeder link can both remain connected simultaneously.

[0092] However, in some cases, such as in the initial stage of satellite network deployment, it cannot be guaranteed that the service link and the feeder link can maintain connections simultaneously. To support data transmission (e.g., delay-tolerant service data), a store-and-forward communication mode is proposed. Figure 4 is a schematic diagram of a satellite communication system based on store-and-forward in the related art, such as Figure 4 As shown, taking the uplink data transmission as an example, when the terminal has uplink data to send, it can first send the data to the satellite through the service link (as shown in step A in the figure), and the satellite stores the relevant data. When the satellite moves to a position where the feeder link is available, it forwards the stored data to the ground network (as shown in step B in the figure). Similarly, when there is downlink data to be sent to the terminal, the ground network first sends the data to the satellite, and the satellite stores the relevant downlink data. When the satellite moves to a position where the service link is available, it forwards the stored data to the terminal.

[0093] Next, in conjunction with the accompanying drawings, the connection management method provided by the embodiments of the present application will be described in detail through some embodiments and their application scenarios.

[0094] Figure 5 is one of the flow schematic diagrams of the connection management method provided by the embodiments of the present application, such as Figure 5 As shown, the method includes:

[0095] Step 501: When the service link between the terminal and the first access network device is unavailable, the terminal performs any one of the following connection management operations:

[0096] Maintain the radio interface connection with the first access network device; Exemplarily, the terminal maintains the logical radio interface connection with the first device.

[0097] Release the radio interface connection with the first access network device.

[0098] Suspend the radio interface connection; Exemplarily, when the access layer security of the terminal is activated, the terminal performs the process of suspending the radio interface connection, such as the terminal enters the inactive state. In this state, the terminal maintains the access layer context (AS context) of the terminal.

[0099] When the service link is available, the terminal performs at least one of the following connection management operations:

[0100] Resume data transmission with the first access network device; Exemplarily, this connection management operation applies to the case where the access stratum (AS) security of the terminal is activated, not activated, or the terminal has no AS security (such as a control plane only UE). Re - establish the radio link connection with the first access network device; Exemplarily, this connection management operation applies to the case where the access stratum (AS) security of the terminal is activated, not activated, or the terminal has no AS security (such as a control plane only UE).

[0101] Resume the radio link connection; Exemplarily, such as performing an RRC resume procedure, this connection management operation only applies to the case where the access stratum (AS) security of the terminal is activated. Exemplarily, in the case where the access stratum security of the terminal is activated, the terminal performs an RRC resume procedure for the radio link connection so that the terminal moves from the inactive state to the connected state.

[0102] Optionally, the service link is a satellite link. The service link and the feeder link are not available simultaneously; wherein, the feeder link is the feeder link between the first access network device and the core network device corresponding to the terminal.

[0103] Specifically, under the S&F mechanism, during the data transmission between the terminal and the core network element, the service link will experience multiple processes of service link available, service link unavailable, service link available... That is, the state of the service link will change multiple times. For example, during the registration process, the terminal needs to perform data transmission with the core network element, during which the terminal will experience multiple processes of service link available, service link unavailable, service link available... Of course, processes such as Mobile Originated Early Data Transmission (MO - EDT), Mobile Terminated Early Data Transmission (MT - EDT), control plane signaling optimization (such as Control Plane CIoT EPS / 5GS optimisation), and user plane signaling optimization (such as UserPlane CIoT EPS / 5GS optimisations) may occur. This application is applicable to but not limited to the above - mentioned scenarios. Additionally, it should be noted that this application at least applies to the connection management when the service link is unavailable or during the unavailable period in the above - mentioned processes. After a certain process is completed, such as after successful registration, how the terminal manages the connection can be based on existing mechanisms, such as returning to the idle state according to the network - side configuration.

[0104] Optionally, when the service link between the terminal and the first access network device is unavailable, the terminal may release the air interface connection with the first access network device, or may still maintain the air interface connection with the first access network device, such as a logical air interface connection.

[0105] Optionally, when the service link changes from unavailable to available, if the terminal still maintains the air interface connection with the first access network device, the terminal may directly resume data transmission with the first access network device; otherwise, the terminal needs to re-establish the air interface connection with the first access network device before it can perform data transmission with the first access network device.

[0106] It should be noted that the above connection management may be applicable before the AS security is activated, or before the terminal is successfully registered, etc. Exemplarily, in the case where the AS security is not activated or there is no AS security (such as a control plane only UE), when the service link is about to become unavailable, the network side may provide RRC release with suspend config to the terminal to facilitate the terminal to release the air interface connection while retaining the terminal context (such as the terminal is in the NAS layer data transmission state, etc.). Exemplarily, in this case, the terminal does not need to maintain the AS context. When the service link is available, since the AS security of the terminal is not activated, it is impossible to perform data transmission based on the existing RRC resume procedure (i.e., the RRC resume procedure, for example, by sending an RRC resume request carrying a short MAC-I parameter processed based on AS security). At this time, the terminal needs to re-establish an air interface connection. Generally speaking, when the service link is available, the terminal may discard the access stratum context AS context and re-establish the air interface connection.

[0107] Optionally, the terminal in the embodiments of the present application has the ability of store-and-forward, and / or can transmit data through store-and-forward operations. The first access network device includes any one of the following: an on-board base station, a distributed unit (DU) of the on-board base station, and an on-board distributed unit DU of the base station. Wherein, the first access network device may be an S&F type base station, and the first access network device may also be referred to as the anchor base station or anchor satellite of the terminal, which is the base station or satellite that stores the terminal context.

[0108] Optionally, the availability of the service link can be understood as that the service link between the terminal and the first access network device is connected. Exemplarily, when the first access network device is an on-satellite base station, generally speaking, the availability of the service link can be understood as that the terminal is under the coverage of the first on-satellite base station of the above-mentioned first satellite, or there is a satellite corresponding to the first on-satellite base station above the head of the terminal; the unavailability of the service link can be understood as that the service link between the terminal and the first access network device is disconnected. Exemplarily, when the first access network device is an on-satellite base station, generally speaking, the unavailability of the service link can be understood as that the terminal is not under the coverage of the first on-satellite base station of the above-mentioned first satellite, or there is no satellite corresponding to the first on-satellite base station above the head of the terminal.

[0109] It should be noted that under the S&F mechanism, the state of the service link will change multiple times, and the terminal can perform the above connection management operations multiple times according to the state change of the service link, so as to realize normal data transmission under the S&F mechanism.

[0110] In the connection management method provided by the embodiments of the present application, under the S&F mechanism, the state of the service link will change multiple times. In the embodiments of the present application, through radio interface connection management, when the service link between the terminal and the first access network device is unavailable, the terminal can release the radio interface connection with the first access network device, or can still maintain the radio interface connection with the first access network device; when the service link changes from unavailable to available, the terminal can directly resume data transmission with the first access network device, or realize data transmission with the first access network device by re-establishing the radio interface connection with the first access network device, that is, normal data transmission under the S&F mechanism is realized based on effective connection management, and the problem of abnormal data transmission under the S&F mechanism is solved.

[0111] Optionally, when the terminal maintains the radio interface connection with the first access network device, the terminal suspends data transmission with the first access network device;

[0112] Or,

[0113] When the terminal releases the radio interface connection with the first access network device, the terminal saves the context information of the terminal.

[0114] Specifically, when the service link between the terminal and the first access network device is unavailable, the terminal can still maintain the radio interface connection with the first access network device and suspend data transmission with the first access network device. When the service link is available, the terminal can resume data transmission with the first access network device, so as to realize normal data transmission under the S&F mechanism.

[0115] Alternatively, when the service link between the terminal and the first access network device is unavailable, the terminal can also release the air interface connection with the first access network device and save the context information of the terminal, thereby preventing the terminal from returning to the initial state and enabling the terminal to correctly decode the received data during data transmission. Optionally, the context information of the terminal includes at least one of the following: the AS context information of the terminal, the NAS context information of the terminal. Exemplarily, the context information of the terminal may include the NAS layer data transmission status, etc. In the method of the above embodiment, when the terminal maintains the air interface connection with the first access network device, the terminal suspends the data transmission with the first access network device; or, when the terminal releases the air interface connection with the first access network device, the terminal saves the context information of the terminal; thereby enabling the terminal to continue normal data transmission when the service link changes from unavailable to available, improving the efficiency and accuracy of data transmission.

[0116] Optionally, suspending the data transmission with the first access network device includes at least one of the following:

[0117] The terminal suspends the data transmission with the first access network device according to the first auxiliary information sent by the first access network device;

[0118] The terminal suspends the data transmission with the first access network device according to the cell coverage stop time information corresponding to the first access network device.

[0119] Specifically, the terminal can suspend the data transmission with the first access network device according to the first auxiliary information sent by the first access network device; optionally, the first auxiliary information may include information related to the terminal suspending data transmission. For example,

[0120] The first auxiliary information includes at least one of the following:

[0121] The first indication information; the first indication information is used to indicate the terminal to suspend the data transmission with the first access network device;

[0122] The second indication information, the second indication information is used to indicate that the service link is unavailable;

[0123] The start time information of suspending data transmission;

[0124] The duration information of suspending data transmission;

[0125] The end time information of suspending data transmission;

[0126] The time information of the next service link availability.

[0127] Optionally, the first access network device may send first auxiliary information to the terminal through dedicated signaling. After receiving the first auxiliary information sent by the first access network device, the terminal may suspend data transmission with the first access network device according to the first auxiliary information, and may determine information such as the start time, end time, and duration of the suspended data transmission. Furthermore, when the service link is available, the terminal may promptly resume data transmission with the first access network device to achieve normal data transmission under the S&F mechanism.

[0128] Optionally, the first access network device may also send cell coverage stop time information to the terminal through a system message. The terminal suspends data transmission with the first access network device according to the received cell coverage stop time information corresponding to the first access network device.

[0129] For the method in the above embodiments, the terminal may suspend data transmission with the first access network device according to the first auxiliary information sent by the first access network device; the terminal may also suspend data transmission with the first access network device according to the cell coverage stop time information corresponding to the first access network device. Thus, when the service link is unavailable, the terminal can be accurately and flexibly instructed to suspend data transmission in multiple ways, effectively implementing connection management under the S&F mechanism. Furthermore, when the service link is available, the terminal can promptly resume data transmission with the first access network device to achieve normal data transmission under the S&F mechanism.

[0130] Optionally, when the service link is unavailable, the method further includes any one of the following:

[0131] The terminal attempts to camp on a cell covered by a second access network device;

[0132] The terminal stops attempting to camp on a cell covered by a second access network device.

[0133] Specifically, when the service link is unavailable, the terminal may attempt to camp on a cell covered by a second access network device to receive paging messages such as emergency calls, or may stop searching for a new cell to camp on and continue to wait for the service link with the first access network device to resume.

[0134] Optionally, the terminal stops attempting to camp on a cell covered by a second access network device, including at least one of the following:

[0135] The terminal stops searching for a cell covered by a second access network device;

[0136] The terminal stops camping on a cell covered by a second access network device;

[0137] The terminal stops link monitoring with the second access network device;

[0138] The terminal suspends the access stratum (AS) operations related to the first access network device.

[0139] Specifically, when the service link is unavailable, the terminal can stop searching for a new cell to camp on, that is, stop searching for cells covered by the second access network device, stop camping on cells covered by the second access network device, stop link monitoring with the second access network device, and suspend the access stratum (AS) operations related to the first access network device, and wait until the service link with the first access network device is restored before transmitting data.

[0140] Optionally, the terminal attempts to camp on a cell covered by the second access network device, including at least one of the following:

[0141] The terminal suspends the AS operations related to the first access network device;

[0142] The terminal performs cell selection and / or cell reselection;

[0143] The terminal camps on a cell covered by the second access network device;

[0144] The terminal receives a paging message sent by the second access network device;

[0145] The terminal receives a system message sent by the second access network device.

[0146] Specifically, when the service link is unavailable, the terminal can attempt to camp on a cell covered by the second access network device, that is, the terminal suspends the AS operations related to the first access network device, performs cell selection and / or cell reselection, camps on a cell covered by the second access network device, receives a paging message sent by the second access network device, and receives a system message sent by the second access network device, so that the terminal camps on a cell covered by the second access network device, and thus can receive messages such as emergency calls in a timely manner.

[0147] For the method of the above embodiments, when the service link is unavailable, the terminal can attempt to camp on the second access network device, so that the terminal can receive messages such as emergency calls in a timely manner; the terminal can also stop searching for a new cell to camp on and wait until the service link with the first access network device is restored before transmitting data, so as to meet the requirements in different scenarios. Optionally, resuming data transmission with the first access network device includes at least one of the following:

[0148] The terminal obtains service link available time information and resumes data transmission with the first access network device according to the service link available time information;

[0149] The terminal resumes data transmission with the first access network device when it camps on a cell covered by the first access network device again.

[0150] Specifically, when the service link changes from unavailable to available, the terminal needs to promptly resume data transmission to achieve normal data transmission under the S&F mechanism. Optionally, the terminal can resume data transmission by obtaining service link available time information; the terminal can also resume data transmission with the first access network device when it determines that it has re-resided in the cell covered by the first access network device.

[0151] Optionally, the terminal can learn that it has re-resided in the first access network device based on the identification information of the satellite; or, the terminal can also learn that it has re-resided in the first access network device based on the identification information of the access network device.

[0152] For the method in the above embodiment, the terminal can resume data transmission based on the obtained service link available time information, or can also resume data transmission by determining whether it has re-resided in the cell covered by the first access network device, so that when the service link changes from unavailable to available, the terminal can promptly and accurately resume data transmission and achieve normal data transmission under the S&F mechanism.

[0153] Optionally, resuming data transmission with the first access network device includes resuming at least one of the following:

[0154] Receiving a downlink non-access stratum (NAS) message sent by the first access network device;

[0155] Receiving downlink service data sent by the first access network device;

[0156] Receiving feedback information related to uplink service data sent by the first access network device;

[0157] Sending an uplink NAS message to the first access network device;

[0158] Sending uplink service data to the first access network device;

[0159] Sending feedback information related to downlink service data to the first access network device.

[0160] Optionally, the terminal obtains service link available time information, including at least one of the following: the terminal obtains service link available time information based on the ephemeris information corresponding to the first access network device;

[0161] The terminal obtains service link available time information based on the service link available time information sent by the first access network device received;

[0162] The terminal obtains service link available time information according to the arrival time information of the cell covered by the first access network device provided by the second access network device.

[0163] Specifically, after the terminal obtains the service link available time information, it can promptly and accurately resume data transmission based on the obtained service link available time information, thereby improving the efficiency of data transmission. Optionally, the first access network device can directly send the service link available time information to the terminal; the terminal can also determine the service link available time information based on ephemeris information, or can also determine the service link available time information according to the arrival time information of the cell covered by the first access network device provided by the second access network device, which enables the terminal to obtain the service link available time information based on multiple methods, and then can promptly resume data transmission.

[0164] Optionally, the service link available time information includes any one of the following:

[0165] The first time information; the first time information is the time when the service link between the terminal and the first access network device is available;

[0166] The first start time information; the first start time information is used to indicate the start time when the service link is unavailable;

[0167] The first end time information, the first end time information is used to indicate the end time when the service link is unavailable;

[0168] The first duration information; the first duration information is used to indicate the duration when the service link is unavailable.

[0169] Specifically, the service link available time information can include the time when the service link is available, or can also include the start time when the service link is unavailable, the end time when the service link is unavailable, and the duration when the service link is unavailable, which accurately indicates the service link available time information in multiple ways, and then the terminal can promptly resume data transmission when the service link changes from unavailable to available.

[0170] Optionally, the service link available time information is provided by the first access network device to the terminal before the service link becomes unavailable, and the first access network device can provide the service link available time information to the terminal through a system message or a dedicated message.

[0171] Optionally, after the terminal obtains the service link available time information, it can set a timer; wherein, the start time of the timer corresponds to the start time when the service link is unavailable, and the time length of the timer is the same as the duration when the service link is unavailable. Optionally, when the timer times out, the terminal can know that the service link has changed from an unavailable state to an available state, and then can promptly resume data transmission to achieve normal data transmission under the S&F mechanism.

[0172] In the method of the above embodiments, the first access network device may directly send service link available time information to the terminal; the terminal may also determine the service link available time information based on ephemeris information, and may also determine the service link available time information according to the arrival time information of the cell covered by the first access network device provided by the second access network device. As a result, the terminal can accurately obtain the service link available time information based on multiple methods, and then can resume data transmission in a timely manner when the service link changes from unavailable to available, realizing normal data transmission under the S&F mechanism.

[0173] Optionally, when the terminal resumes data transmission with the first access network device, the following at least one item is further included:

[0174] The terminal performs uplink synchronization with the first access network device;

[0175] The terminal performs downlink synchronization with the first access network device.

[0176] Exemplarily, when the terminal resumes data transmission with the first access network, the terminal also reports timing advance (TA) information.

[0177] Optionally, the above suspension of the radio interface connection includes any one of the following;

[0178] The terminal enters the idle state and the suspended state. Exemplarily, the terminal enters the RRC idle with suspend state, which is applicable to the LTE scenario;

[0179] The terminal enters the inactive state. Exemplarily, the terminal enters the RRC inactive state, which is applicable to the NR scenario;

[0180] It should be noted that the terminal can be based on network-side configuration. For example, the network side sends an RRC release message to the terminal, where the message carries radio interface suspension indication information, such as rrc-suspend, or carries suspension configuration information, such as Suspend config. Additionally, indication information can also be carried in the message, and the indication information is used to indicate that the service link is unavailable.

[0181] Optionally, the above restoration of the radio interface connection includes: the terminal executes the radio resource control restoration process, the RRC resume process. It should be noted that the terminal can only execute the operation of restoring the radio interface connection when the AS security of the terminal is activated. Otherwise, the terminal re-establishes the radio interface connection.

[0182] Optionally, releasing the radio interface connection with the first access network device includes at least one of the following:

[0183] The terminal releases the radio link with the first access network device according to the auxiliary information sent by the first access network device;

[0184] The terminal releases the radio link with the first access network device according to the cell coverage stop time information corresponding to the first access network device.

[0185] Specifically, the terminal can release the radio link with the first access network device according to the auxiliary information sent by the first access network device; the terminal can also release the radio link with the first access network device according to the cell coverage stop time information corresponding to the first access network device. Thus, in the case where the service link is unavailable, the terminal can accurately and flexibly indicate to release the radio link with the first access network device in multiple ways, effectively implementing the connection management under the S&F mechanism. Furthermore, when the service link changes from unavailable to available, the terminal can promptly resume data transmission with the first access network device, realizing normal data transmission under the S&F mechanism.

[0186] Optionally, the auxiliary information includes the reason information for releasing the radio link; the reason information includes at least one of the following:

[0187] The service link is disconnected;

[0188] The service link is unavailable;

[0189] The store-and-forward communication mode.

[0190] Optionally, re-establishing the radio link with the first access network device includes at least one of the following:

[0191] The terminal obtains the service link available time information and re-establishes the radio link with the first access network device according to the service link available time information;

[0192] When the terminal camps on the first access network device again, it re-establishes the radio link with the first access network device;

[0193] The terminal re-establishes the radio link with the first access network device according to the paging message sent by the first access network device;

[0194] The terminal re-establishes the radio link with the first access network device according to the short message sent by the first access network device.

[0195] Specifically, when the service link changes from unavailable to available, the terminal can re - establish an air interface connection with the first access network device, thereby realizing normal data transmission under the S&F mechanism. Optionally, the terminal can obtain service link available time information to re - establish an air interface connection with the first access network device; the terminal can also re - establish an air interface connection with the first access network device when it determines that it has re - camped on the cell covered by the first access network device; it can also re - establish an air interface connection with the first access network device according to paging messages and short messages. Optionally, the paging messages and short messages may include paging reason information; among them, the paging reason information includes at least one of the following: stored - and - forwarded communication mode and downlink data arrival.

[0196] Optionally, the terminal can learn that it has re - camped on the first access network device based on the satellite identification information; or, the terminal can also learn that it has re - camped on the first access network device based on the access network device identification information.

[0197] Optionally, the terminal can obtain service link available time information based on the ephemeris information corresponding to the first access network device; the terminal can also obtain service link available time information based on the service link available time information sent by the received first access network device; the terminal can also obtain service link available time information according to the arrival time information of the cell covered by the first access network device provided by the second access network device, so as to accurately obtain service link available time information in multiple ways.

[0198] For the method of the above - mentioned embodiment, when the service link changes from unavailable to available, the terminal can resume data transmission based on the obtained service link available time information, or can also resume data transmission by determining whether it has re - camped on the cell covered by the first access network device. Thus, when the service link changes from unavailable to available, data transmission can be resumed in a timely and accurate manner, realizing normal data transmission under the S&F mechanism.

[0199] Optionally, re - establishing an air interface connection with the first access network device includes any one of the following:

[0200] The NAS of the terminal triggers the AS of the terminal to re - establish an air interface connection with the first access network device;

[0201] The AS of the terminal triggers re - establishing an air interface connection with the first access network device.

[0202] Specifically, the NAS layer can trigger the AS layer to re - establish the radio link connection. For example, when the service chain route changes from unavailable to available, the NAS layer of the terminal triggers the AS of the terminal to re - establish the radio link connection. Optionally, it can also be the AS layer that triggers the re - establishment of the radio link connection. Optionally, when the terminal re - establishes the radio link connection with the first access network device, the behavior of the terminal further includes discarding the stored AS context.

[0203] Optionally, the connection management method further includes:

[0204] The terminal indicates the reason for establishing the radio link connection to the first access network device; the reason for establishing the radio link connection includes: the store - and - forward communication mode.

[0205] Specifically, when the terminal re - establishes the radio link connection with the first access network device, it can indicate the reason for establishing the radio link connection to the first access network device; among them, the reason for establishing the radio link connection includes: the store - and - forward communication mode. Optionally, the terminal can directly send the reason for establishing the radio link connection to the first access network device, or the terminal can send a radio link connection establishment request message to the first access network device; where the radio link connection establishment request message is used to indicate the reason for establishing the radio link connection.

[0206] For example, during the process of the terminal re - establishing the radio link connection with the first access network device, the terminal indicates the reason for establishing the radio link connection to the first access network device, where the reason for connection establishment is used to indicate that the terminal accesses the network based on S&F. Optionally, the reason for establishing the radio link connection can be provided in any of the following ways:

[0207] A newly introduced value for the reason for connection establishment, for example, introducing a new indication for the reason for connection establishment, such as S&F;

[0208] Through a newly introduced radio link connection establishment request message. For example, by using the newly introduced radio link connection establishment request message to inform the network that the terminal accesses the network based on the S&F method.

[0209] In the method of the above - mentioned embodiment, when the service chain route changes from unavailable to available, during the process of the terminal re - establishing the radio link connection with the first access network device, the terminal can directly send the reason for establishing the radio link connection to the first access network device, or the terminal can send a radio link connection establishment request message to the first access network device, and indicate the reason for establishing the radio link connection through the radio link connection establishment request message, so as to timely and accurately re - establish the radio link connection with the first access network device when the service chain route changes from unavailable to available, and then data transmission can be carried out based on the re - established radio link connection, realizing normal data transmission under the S&F mechanism.

[0210] Figure 6 It is the second schematic flowchart of the connection management method provided by the embodiments of the present application. The method includes:

[0211] Step 601: When the service link between the first access network device and the terminal is unavailable, the first access network device performs any one of the following connection management operations:

[0212] Maintain the radio connection with the first access network device;

[0213] Suspend the radio connection; Exemplarily, when the access layer security of the terminal is activated, the terminal performs the process of suspending the radio connection, such as the terminal entering the inactive state. In this state, the terminal maintains the access layer context (AS context) of the terminal.

[0214] Release the radio connection with the first access network device;

[0215] When the service link is available, the terminal performs at least one of the following connection management operations:

[0216] Resume data transmission with the first access network device; Exemplarily, this connection management operation is applicable to the cases where the access layer (AS) security of the terminal is activated, or the AS security is not activated, or the terminal has no AS security (such as a control plane only UE).

[0217] Resume the radio connection;

[0218] Re - establish the radio connection with the first access network device. Exemplarily, this connection management operation is applicable to the cases where the access layer (AS) security of the terminal is activated, or the AS security is not activated, or the terminal has no AS security (such as a control plane only UE).

[0219] Resume the radio connection; Exemplarily, such as performing the RRC resume procedure. This connection management operation is only applicable to the case where the access layer (AS) security of the terminal is activated. Exemplarily, when the access layer security of the terminal is activated, the terminal performs the RRC resume procedure of the radio connection to enable the terminal to enter the connected state from the inactive state.

[0220] Specifically, under the S&F mechanism, during the data transmission between the terminal and the core network element, the service link will experience multiple processes of service link available, service link unavailable, service link available... That is, the state of the service link will change multiple times. For example, during the registration process, the terminal needs to transmit data with the core network element. During this period, the terminal will experience multiple processes of service link available, service link unavailable, service link available... Of course, it may occur in processes such as Mobile Originated Early Data Transmission (MO-EDT), Mobile Terminated Early Data Transmission (MT-EDT), control plane signaling optimization (such as Control Plane CIoT EPS / 5GS optimisation), and user plane signaling optimization (such as UserPlane CIoT EPS / 5GS optimisations). This application is applicable to but not limited to the above scenarios. Additionally, it should be noted that this application is at least applicable to the connection management when the service link is unavailable or during the unavailable period in the above-mentioned processes. After a certain process is completed, such as after successful registration, how the terminal manages the connection can be based on existing mechanisms, such as returning to the idle state according to the network side configuration, etc.

[0221] Optionally, when the service link between the first access network device and the terminal is unavailable, the first access network device can release the air interface connection with the terminal or still maintain the air interface connection with the terminal.

[0222] Optionally, when the service link changes from unavailable to available, if the first access network device still maintains the air interface connection with the first access network device, the first access network device can directly resume data transmission with the terminal; otherwise, the first access network device needs to re-establish the air interface connection with the terminal before it can transmit data with the terminal.

[0223] It should be noted that the above connection management can be applied before the AS security is activated, or before the terminal is successfully registered, etc. Exemplarily, in the case where the AS security is not activated or there is no AS security (such as a control plane only UE), when the service link is about to become unavailable, the network side can provide the terminal with an RRC release with suspend config to facilitate the terminal to release the radio link connection while retaining the terminal context (such as the terminal is in the NAS layer data transmission state, etc.). Exemplarily, in this case, the terminal does not need to maintain the AS context. When the service link is available, since the AS security of the terminal is not activated, it is impossible to perform the existing RRC resume procedure (i.e., the RRC resume procedure, for example, by sending an RRC resume request carrying a short MAC-I parameter based on AS security processing). At this time, the terminal needs to re-establish a radio link connection. Generally speaking, when the service link is available, the terminal can discard the access stratum context AS context and re-establish a radio link connection.

[0224] Optionally, the terminal in the embodiments of the present application has the ability of store-and-forward, and / or can transmit data through store-and-forward operations. Optionally, the first access network device includes any one of the following: an on-board base station, a distributed unit (DU) of the on-board base station, and an on-board distributed unit DU of the base station. Among them, the first access network device can be an S&F type base station, and the first access network device can also be referred to as the anchor base station or anchor satellite of the terminal, which is the base station or satellite that stores the terminal context. When the service link is available, the terminal performs data transmission through the radio link connection.

[0225] Optionally, the availability of the service link can be understood as that the service link between the terminal and the first access network device is connected; Exemplarily, in the case where the first access network device is an on-board base station, generally speaking, the availability of the service link can be understood as that the terminal is under the coverage of the first on-board base station of the above first satellite, or there is a satellite corresponding to the first on-board base station above the head of the terminal; The unavailability of the service link can be understood as that the service link between the terminal and the first access network device is disconnected. Exemplarily, in the case where the first access network device is an on-board base station, generally speaking, the availability of the service link can be understood as that the terminal is not under the coverage of the first on-board base station of the above first satellite, or there is no satellite corresponding to the first on-board base station above the head of the terminal.

[0226] It should be noted that in the S&F mechanism, the state of the service link will change multiple times. Therefore, the first access network device needs to perform the above connection management operations multiple times according to the state change of the service link to realize normal data transmission under the S&F mechanism.

[0227] In the connection management method provided by the embodiments of the present application, under the S&F mechanism, the state of the service link will change multiple times. In the embodiments of the present application, through radio access connection management, when the service link between the first radio access network device and the terminal is unavailable, the first radio access network device may release the radio access connection with the terminal or may still maintain the radio access connection with the terminal; when the service link changes from unavailable to available, the first radio access network device may directly resume data transmission with the terminal or may achieve data transmission with the terminal by re-establishing the radio access connection with the terminal, thereby realizing normal data transmission under the S&F mechanism based on effective connection management and solving the problem of abnormal data transmission under the S&F mechanism.

[0228] Optionally, when the first radio access network device maintains the radio access connection with the terminal, the first radio access network device suspends data transmission with the terminal;

[0229] Or,

[0230] When the first radio access network device releases the radio access connection with the terminal, the first radio access network device saves the context information.

[0231] Optionally, the connection management method further includes at least one of the following:

[0232] The first radio access network device sends first auxiliary information to the terminal; the first auxiliary information is used for the terminal to suspend data transmission with the first radio access network device;

[0233] The first radio access network device sends the cell coverage stop time information corresponding to the first radio access network device to the terminal; the cell coverage stop time information is used for the terminal to suspend data transmission with the first radio access network device.

[0234] Optionally, the first auxiliary information includes at least one of the following:

[0235] The first indication information; the first indication information is used to indicate that the terminal suspends data transmission with the first radio access network device;

[0236] The second indication information, the second indication information is used to indicate that the service link is unavailable;

[0237] The start time information of the suspended data transmission;

[0238] The duration information of the suspended data transmission;

[0239] The end time information of the suspended data transmission;

[0240] The time information of the next available service link.

[0241] Optionally, the first radio access network device sending the first auxiliary information to the terminal includes:

[0242] The first access network device sends first auxiliary information to the terminal via dedicated signaling.

[0243] Optionally, the first access network device sends the cell coverage stop time information corresponding to the first access network device to the terminal, including:

[0244] The first access network device sends the cell coverage stop time information to the terminal via the system message.

[0245] Optionally, resuming data transmission with the terminal includes resuming at least one of the following:

[0246] Sending a downlink non-access stratum (NAS) message to the terminal;

[0247] Sending downlink service data to the terminal;

[0248] Sending feedback information related to the uplink service data to the terminal;

[0249] Receiving an uplink NAS message sent by the terminal;

[0250] Receiving uplink service data sent by the terminal;

[0251] Receiving feedback information related to the downlink service data sent by the terminal.

[0252] Optionally, the connection management method further includes at least one of the following:

[0253] The first access network device sends the corresponding ephemeris information to the terminal; the ephemeris information is used by the terminal to obtain the service link available time information;

[0254] The first access network device sends the service link available time information to the terminal;

[0255] The second access network device provides the arrival time information of the cell covered by the first access network device to the terminal, and the arrival time information of the cell covered by the first access network device is used by the terminal to obtain the service link available time information.

[0256] Optionally, the service link available time information includes any one of the following:

[0257] The first time information; the first time information is the time when the service link between the terminal and the first access network device is available;

[0258] The first start time information; the first start time information is used to indicate the start time when the service link is unavailable;

[0259] The first end time information, and the first end time information is used to indicate the end time when the service link is unavailable;

[0260] The first duration information; the first duration information is used to indicate the duration for which the service link is unavailable.

[0261] Optionally, the first access network device provides the terminal with service link available time information before the service link becomes unavailable.

[0262] Optionally, the first access network device provides the terminal with service link available time information through a system message or a dedicated message.

[0263] Optionally, when the first access network device resumes data transmission with the terminal, it further includes at least one of the following:

[0264] The first access network device performs uplink synchronization with the terminal;

[0265] The first access network device performs downlink synchronization with the terminal.

[0266] Optionally, the connection management method further includes at least one of the following:

[0267] The first access network device sends auxiliary information to the terminal; the auxiliary information is used for the terminal to release the radio link connection with the first access network device;

[0268] The first access network device sends corresponding cell coverage stop time information to the terminal; the cell coverage stop time information is used for the terminal to release the radio link connection with the first access network device.

[0269] Optionally, the auxiliary information includes cause information for releasing the radio link connection; the cause information includes at least one of the following:

[0270] The service link is disconnected;

[0271] The service link is unavailable;

[0272] The store-and-forward communication mode.

[0273] Optionally, the connection management method further includes at least one of the following:

[0274] The first access network device provides the terminal with service link available time information; the service link available time information is used for the terminal to re-establish the radio link connection with the terminal;

[0275] The first access network device sends a paging message to the terminal; the paging message is used for the terminal to re-establish the radio link connection with the first access network device;

[0276] The first access network device sends a short message to the terminal; the short message is used for the terminal to re-establish the radio link connection with the first access network device.

[0277] Optionally, the first access network device provides the terminal with service link available time information, including at least one of the following:

[0278] The first access network device sends corresponding ephemeris information to the terminal; the ephemeris information is used for the terminal to obtain service link available time information;

[0279] The first access network device sends service link available time information to the terminal;

[0280] The second access network device provides the arrival time information of the cell covered by the first access network device to the terminal; the arrival time information of the cell covered by the first access network device is used for the terminal to obtain service link available time information.

[0281] Optionally, the paging message includes paging cause information; the paging cause information includes at least one of the following: stored and forwarded communication mode and downlink data arrival.

[0282] Optionally, the paging message includes a paging cause indication field; the cause indication field includes paging cause information.

[0283] Optionally, the short message includes paging cause information; the paging cause information includes at least one of the following: stored and forwarded communication mode and downlink data arrival.

[0284] Optionally, the connection management method further includes:

[0285] The first access network device receives the radio interface connection establishment cause indicated by the terminal; the radio interface connection establishment cause includes: stored and forwarded communication mode.

[0286] Optionally, the first access network device receives the radio interface connection establishment cause indicated by the terminal, including any one of the following:

[0287] The first access network device receives the radio interface connection establishment cause sent by the terminal;

[0288] The first access network device receives the radio interface connection establishment request message sent by the terminal; the radio interface connection establishment request message is used to indicate the radio interface connection establishment cause.

[0289] Optionally, the second access network device includes any one of the following:

[0290] On-board base station;

[0291] Distributed unit DU of the on-board base station;

[0292] On-board distributed unit DU of the base station;

[0293] Ground base station.

[0294] The interaction process of the connection management method provided by the embodiments of this application is as Figures 7 - 11 shown as follows:

[0295] When the service link between the terminal and the first access network device is unavailable, the terminal can maintain the radio link connection with the first access network device as follows:

[0296] (1) The terminal transmits data with the core network element based on the S&F mechanism. It should be noted that during the data transmission, the service link will experience multiple processes of service link available, service link unavailable, service link available... That is, the state of the service link will change multiple times.

[0297] (2) When the service link is available, the terminal establishes a radio link connection with the first access network device. Among them, when the service link is available, the terminal performs data transmission through the radio link connection. Among them, the first access network device can be an S&F type base station. Additionally, the first access network device can be referred to as the anchor base station or anchor satellite of the terminal. The anchor base station or anchor satellite is the base station or satellite that stores the context of the terminal.

[0298] It should be noted that the availability of the service link can be understood as that the service link between the terminal and the first on-board base station is connected.

[0299] (3) In the S&F operation mode, when the service link is unavailable, the terminal maintains a logical radio link connection with the first access network device. Among them, when the service link is unavailable, the behavior of the terminal also includes the terminal suspending the data transmission with the first access network device.

[0300] It should be noted that the unavailability of the service link can be understood as that the service link between the terminal and the first access network device is disconnected.

[0301] Among them, the terminal can suspend the data transmission with the first access network device in one or more of the following ways:

[0302] Based on the auxiliary information provided by the first access network device. The auxiliary information can be provided by the first access network device to the terminal through dedicated information.

[0303] Based on the cell coverage stop time information; such as the T-service information field indicated in the system message. Exemplarily, if the T-service indicates the time when the cell coverage stops, the terminal starts to suspend the data transmission with the first access network device from the time point indicated by the T-service;

[0304] Among them, the auxiliary information includes one or more of the following:

[0305] The indication information for suspending the data transmission with the first access network device. Exemplarily, the indication information can be one-bit indication information;

[0306] Time information for suspending data transmission with the first access network device; wherein, the time information may be at least one of a suspension start time, a suspension duration, and a suspension end time. Exemplarily, the time information may indicate the suspension start time information, such as the terminal suspends data transmission with the first access network device starting from the start time; Exemplarily, the time information may also indicate the suspension end time information, such as the terminal believes that data transmission needs to be suspended before at least the time point of the suspension end time information; It should be noted that in the case where the suspension start time is not included, it is default that the terminal starts to suspend air interface transmission when receiving the auxiliary information at the receiving end.

[0307] Wherein, in the case where the service link is unavailable, the terminal behavior further includes any one of the following:

[0308] Stop camping on the cell covered by the second access network device; the second access network device may be an on - satellite base station or a ground base station;

[0309] Attempt to camp on the cell covered by the second access network device;

[0310] Wherein, the behavior of stopping camping on the cell covered by the second access network device includes one or more of the following:

[0311] Stop cell search;

[0312] Stop cell camping;

[0313] Stop link detection;

[0314] Suspend AS operations;

[0315] Wherein, the behavior of attempting to camp on the cell covered by the second access network device includes one or more of the following:

[0316] Suspend AS operations related to the first access network device;

[0317] Perform cell selection and reselection;

[0318] Camp on the cell covered by the second access network device;

[0319] Receive paging messages from the cell covered by the second access network device;

[0320] Receive system messages, such as SIB6 / 7 / 8, from the cell covered by the second access network device.

[0321] (4) In the S&F operation mode, in the case where the service link changes from unavailable to available, the terminal resumes data transmission with the first access network device.

[0322] The data transmission includes one or more of the following:

[0323] The terminal receives a downlink NAS message;

[0324] The terminal receives downlink service data;

[0325] The terminal receives feedback information of uplink data;

[0326] Additionally, the data transmission may include one or more of the following:

[0327] The terminal sends an uplink NAS message;

[0328] The terminal sends uplink service data;

[0329] Wherein, when the service link becomes available from being unavailable, the manner in which the terminal behavior resumes data transmission with the first access network device includes one or more of the following:

[0330] The information is restored at the first time, and data transmission with the first access network device is performed.

[0331] When the terminal resides in the cell covered by the first access network device again, the terminal resumes data transmission with the first access network device.

[0332] The first time information may be time information when the service link changes from unavailable to available.

[0333] The first time information may be obtained in one or more of the following ways:

[0334] Based on the ephemeris information of the first access network device, the terminal obtains the time information of the next available service link of the first access network device based on the ephemeris information of the first access network device; Figure 7 shown.

[0335] Based on the service link available time information provided by the first access network device; illustratively, before the service link is disconnected, the first access network device provides the terminal with the time information when the next service link is available; Figure 8 shown.

[0336] Based on the cell coverage information of the first access network device provided by the second access network device, exemplarily, the cell arrival time information of the first access network device provided by the second access network device; Figure 9 shown.

[0337] The service link available time information may be any of the following:

[0338] Future time information; such as Universal Time Coordinated (UTC) time or Global Positioning System (GPS) time. Exemplarily, the available time information of the service link may indicate a future UTC time point. The terminal believes that the service link starts to be available at the time point indicated by the future time information.

[0339] Duration information. Exemplarily, the duration information is used to indicate that the service link is available after a period of time indicated by the duration information. Additionally, the first access network device may also provide the start time information when the service link is unavailable. Exemplarily, the terminal believes that the service link is unavailable at the time indicated by the start time information when the service link is unavailable, and the service link will be available after a period of time indicated by the duration information. Additionally, the terminal may maintain a timer, which is started at the time point indicated by the start time information when the service link is unavailable, and the length of the timer is the duration indicated by the duration information.

[0340] Among them, the available time information of the service link can be in any of the following ways:

[0341] Provided by a dedicated message;

[0342] Provided by a system message;

[0343] Among them, the ways for the terminal to determine that the terminal re-resides in the cell covered by the first access network device include any one of the following:

[0344] Through satellite identification information;

[0345] Through on-satellite base station identification information;

[0346] Among them, in the case where the terminal resumes data transmission with the first access network device, the behavior of the terminal further includes one or more of the following:

[0347] Downlink synchronization with the first access network device;

[0348] Uplink synchronization with the first access network device;

[0349] Among them, uplink synchronization with the first access network device includes initiating a random access procedure. Additionally, the terminal reports time advance information, and the time advance can be reported through the random access procedure.

[0350] In the case where the service link between the terminal and the first access network device is unavailable, the terminal may also release the radio link with the first access network device, specifically as follows:

[0351] (1) The terminal transmits data with the core network element based on the S&F mechanism. It should be noted that during the data transmission, the service link will experience multiple processes of being available, unavailable, available again... That is, the state of the service link will change multiple times.

[0352] (2) When the service link is available, the terminal establishes an air interface connection with the first access network device.

[0353] (3) In the S&F operation mode, when the service link is unavailable, the terminal disconnects the air interface connection with the first access network device.

[0354] It should be noted that the unavailability of the service link can be understood as the disconnection of the service link between the terminal and the first satellite base station.

[0355] Among them, the way for the terminal to disconnect the air interface connection with the first access network device can be any one of the following:

[0356] Based on the auxiliary information provided by the first access network device; the auxiliary information is used to instruct the terminal to disconnect the air interface connection. Exemplarily, the auxiliary information can be a Radio Resource Control (RRC) release message. Additionally, the RRC release message also carries release reason information, and the release reason can be service link disconnection, or service link unavailability, or S&F, etc.

[0357] Based on the cell coverage stop time information; such as the time service T-service information field indicated in the system message. Exemplarily, if the T-service indicates the time when the cell stops covering, the terminal autonomously disconnects the air interface connection at the time point indicated by the T-service or before that time.

[0358] Among them, when the service link is unavailable, the behavior of the terminal further includes the terminal saving the terminal context. Among them, the terminal context includes at least one of the AS context and the NAS context.

[0359] Among them, when the service link is unavailable, the behavior of the terminal further includes attempting to camp on a cell covered by the second access network device.

[0360] Among them, the behavior of attempting to camp on a cell covered by the second access network device includes one or more of the following:

[0361] Performing cell selection and reselection;

[0362] Camping on a cell covered by the second access network device;

[0363] Receive a paging message from a cell covered by the second access network device;

[0364] Access system messages, such as System Information Block (SIB) 6 / 7 / 8, from a cell covered by the second access network device.

[0365] (4) In the S&F operation mode, when the service chain changes from unavailable to available, the terminal re - establishes an air interface connection with the first access network device.

[0366] Wherein, based on the re - established air interface connection, the terminal performs data transmission. The data transmission includes one or more of the following:

[0367] The terminal receives a downlink NAS message;

[0368] The terminal receives downlink service data;

[0369] The terminal receives feedback information for uplink data;

[0370] Additionally, the data transmission further includes one or more of the following:

[0371] The terminal sends an uplink NAS message;

[0372] The terminal sends uplink service data;

[0373] Wherein, when the service chain changes from unavailable to available, the ways for the terminal to re - establish an air interface connection with the first access network device include one or more of the following:

[0374] Re - establish an air interface connection with the first access network device based on first - time information. As Figure 10 shown.

[0375] When the terminal camps on a cell covered by the first access network device again, the terminal re - establishes an air interface connection with the first access network device.

[0376] Re - establish an air interface connection with the first access network device based on network paging. As Figure 11 shown.

[0377] Wherein, the network paging may also carry paging reason information. The paging reason information may indicate the following information:

[0378] S&F operation mode;

[0379] Downlink data of the terminal arrives; among them, the downlink data of the terminal may include at least one of a Down Link (DL) NAS message and DL service data.

[0380] Among them, the paging cause information may be indicated in any of the following ways:

[0381] Paging cause indication field; for example, the paging cause indication field may be carried in a paging message.

[0382] Short message; for example, one bit is used in a short message to indicate the paging cause.

[0383] Among them, the terminal re - establishing the radio link connection with the first access network device may be in any of the following ways:

[0384] The NAS layer triggers the AS layer to re - establish the radio link connection; for example, in the case of the service link restoring the connection, the NAS layer of the terminal triggers the AS of the terminal to re - establish the radio link connection.

[0385] The AS triggers the re - establishment of the radio link connection.

[0386] Additionally, in the case of the terminal re - establishing the radio link connection with the first access network device, the behavior of the terminal further includes discarding the stored AS context;

[0387] Among them, during the process of re - establishing the radio link connection, the terminal indicates the radio link connection establishment reason to the first access network device. The connection establishment reason is used to indicate that the terminal accesses the network based on S&F, etc. The establishment reason may be provided in any of the following ways:

[0388] Newly introduced connection establishment reason value, for example, when a new connection establishment reason indication is introduced, such as S&F;

[0389] Through a newly introduced connection establishment request message. For example, by using a newly introduced connection establishment request message to inform the network that the terminal accesses the network based on the S&F method.

[0390] That is, in the S&F operation mode, when the service link is disconnected, the logical radio link connection can be retained and the radio link transmission can be suspended. When the service link is restored, the radio link transmission is restored. It can also be in the S&F operation mode that when the service link is disconnected, the radio link connection is disconnected but the UE context is retained; when the service link is restored, the radio link transmission is re - established. Thus, in the S&F system, it can ensure that the terminal completes data interaction with the core network, thereby improving the system management efficiency.

[0391] Figure 12One of the structural schematic diagrams of the connection management device provided by the embodiments of this application, including:

[0392] The first execution module 1200 is configured to perform any one of the following connection management operations when the service link with the first access network device is unavailable:

[0393] Maintain the radio connection with the first access network device;

[0394] Suspend the radio connection;

[0395] Release the radio connection with the first access network device;

[0396] When the service link is available, the terminal performs at least one of the following connection management operations:

[0397] Resume data transmission with the first access network device;

[0398] Resume the radio connection;

[0399] Re - establish the radio connection with the first access network device.

[0400] Optionally, the first execution module 1200 is specifically configured to suspend the radio connection when the access stratum AS security is activated for the terminal;

[0401] The terminal resumes the radio connection when the access stratum AS security is activated.

[0402] Optionally, the service link and the feeder link are not available simultaneously; the feeder link is the feeder link between the first access network device and the core network device corresponding to the terminal.

[0403] Optionally, the terminal includes any one or more of the following:

[0404] A terminal with store - and - forward capabilities;

[0405] A terminal that transmits data through store - and - forward operations.

[0406] Optionally, the first access network device includes any one of the following:

[0407] On - satellite base station;

[0408] Distributed unit DU of the on - satellite base station;

[0409] On - satellite distributed unit DU of the base station.

[0410] Optionally, the first execution module 1200 is further configured to suspend data transmission with the first access network device while maintaining the radio connection with the first access network device;

[0411] Or,

[0412] Save the context information of the terminal when releasing the air interface connection with the first access network device.

[0413] Optionally, the first execution module 1200 is specifically configured to suspend data transmission with the first access network device according to the first auxiliary information sent by the first access network device;

[0414] Suspend data transmission with the first access network device according to the cell coverage stop time information corresponding to the first access network device.

[0415] Optionally, the first auxiliary information includes at least one of the following:

[0416] The first indication information; the first indication information is used to indicate that the terminal suspends data transmission with the first access network device;

[0417] The second indication information, the second indication information is used to indicate that the service link is unavailable;

[0418] The start time information of the suspended data transmission;

[0419] The duration information of the suspended data transmission;

[0420] The end time information of the suspended data transmission;

[0421] The time information of the next available service link.

[0422] Optionally, the first execution module 1200 is specifically configured to suspend data transmission with the first access network device according to the first auxiliary information sent by the first access network device through dedicated signaling.

[0423] Optionally, the first execution module 1200 is specifically configured to suspend data transmission with the first access network device according to the cell coverage stop time information sent by the first access network device through system messages.

[0424] Optionally, the first execution module 1200 is further configured to, when the service link is unavailable,

[0425] Attempt to camp on the cell covered by the second access network device; or,

[0426] Stop attempting to camp on the cell covered by the second access network device.

[0427] Optionally, the first execution module 1200 is specifically configured to at least one of the following:

[0428] Stop searching for the cell covered by the second access network device;

[0429] Stop camping on the cell covered by the second access network device;

[0430] Stop link monitoring with the second access network device;

[0431] Suspend the access stratum (AS) operations related to the first access network device.

[0432] Optionally, the first execution module 1200 is specifically configured to perform at least one of the following:

[0433] Suspend the AS operations related to the first access network device;

[0434] Perform cell selection and / or cell reselection;

[0435] Reside in a cell covered by the second access network device;

[0436] Receive a paging message sent by the second access network device;

[0437] Receive a system message sent by the second access network device.

[0438] Optionally, the first execution module 1200 is specifically configured to perform at least one of the following:

[0439] Obtain service link available time information, and resume data transmission with the first access network device according to the service link available time information;

[0440] Resume data transmission with the first access network device in the case of residing again in a cell covered by the first access network device.

[0441] Optionally, the first execution module 1200 is specifically configured to perform at least one of the following:

[0442] Receive a downlink non-access stratum (NAS) message sent by the first access network device;

[0443] Receive downlink service data sent by the first access network device;

[0444] Receive feedback information related to uplink service data sent by the first access network device;

[0445] Send an uplink NAS message to the first access network device;

[0446] Send uplink service data to the first access network device;

[0447] Send feedback information related to downlink service data to the first access network device.

[0448] Optionally, the first execution module 1200 is specifically configured to perform at least one of the following:

[0449] Obtain service link available time information based on the ephemeris information corresponding to the first access network device;

[0450] Obtain service link available time information based on the service link available time information sent by the received first access network device;

[0451] Obtain service link available time information according to the arrival time information of the cell covered by the first access network device provided by the second access network device.

[0452] Optionally, the service link available time information includes any one of the following:

[0453] First time information; the first time information is the time when the service link between the terminal and the first access network device is available;

[0454] First start time information; the first start time information is used to indicate the start time when the service link is unavailable;

[0455] First end time information, the first end time information is used to indicate the end time when the service link is unavailable;

[0456] First duration information; the first duration information is used to indicate the duration when the service link is unavailable.

[0457] Optionally, the service link available time information is provided by the first access network device to the terminal before the service link becomes unavailable.

[0458] Optionally, the first execution module 1200 is further configured to set a timer; the start time of the timer corresponds to the start time when the service link is unavailable; the time length of the timer is the same as the duration when the service link is unavailable.

[0459] Optionally, the first execution module 1200 is specifically configured to consider that the service link between the terminal and the first access network device is available when the timer times out.

[0460] Optionally, the service link available time information is carried by a system message or a dedicated message.

[0461] Optionally, the first execution module 1200 is specifically configured to know that it re-resides in the first access network device based on the identification information of the satellite;

[0462] Know that it re-resides in the first access network device based on the identification information of the access network device.

[0463] Optionally, the first execution module 1200 is further configured to perform at least one of the following:

[0464] Perform uplink synchronization with the first access network device;

[0465] Perform downlink synchronization with the first access network device.

[0466] Optionally, the first execution module 1200 is specifically configured to perform at least one of the following:

[0467] Release the radio link connection with the first access network device according to the auxiliary information sent by the first access network device;

[0468] Release the radio link connection with the first access network device according to the cell coverage stop time information corresponding to the first access network device.

[0469] Optionally, the auxiliary information includes the reason information for releasing the radio link connection; the reason information includes at least one of the following:

[0470] Service link disconnected;

[0471] Service link unavailable;

[0472] Store-and-forward communication mode.

[0473] Optionally, the context information includes at least one of the following:

[0474] AS context information of the terminal;

[0475] NAS context information of the terminal.

[0476] Optionally, the first execution module 1200 is specifically configured to perform at least one of the following:

[0477] Obtain the service link available time information, and re-establish the radio link connection with the first access network device according to the service link available time information;

[0478] When re-attaching to the first access network device, re-establish the radio link connection with the first access network device;

[0479] Re-establish the radio link connection with the first access network device according to the paging message sent by the first access network device;

[0480] Re-establish the radio link connection with the first access network device according to the short message sent by the first access network device.

[0481] Optionally, the first execution module 1200 is specifically configured to perform at least one of the following:

[0482] Obtain the service link available time information based on the ephemeris information corresponding to the first access network device;

[0483] Obtain the service link available time information based on the service link available time information sent by the received first access network device;

[0484] Obtain service link available time information according to the arrival time information of the cell covered by the first access network device provided by the second access network device.

[0485] Optionally, the paging message includes paging cause information; the paging cause information includes at least one of the following: store-and-forward communication mode and downlink data arrival.

[0486] Optionally, the paging message includes a paging cause indication field; the cause indication field includes paging cause information.

[0487] Optionally, the short message includes paging cause information; the paging cause information includes at least one of the following: store-and-forward communication mode and downlink data arrival.

[0488] Optionally, the NAS of the terminal triggers the AS of the terminal to re-establish the radio link connection with the first access network device;

[0489] The AS of the terminal triggers the re-establishment of the radio link connection with the first access network device.

[0490] Optionally, the first execution module 1200 is further configured to indicate the radio link connection establishment reason to the first access network device; the radio link connection establishment reason includes: store-and-forward communication mode.

[0491] Optionally, the first execution module 1200 is further configured to perform at least one of the following:

[0492] Send the radio link connection establishment reason to the first access network device;

[0493] Send a radio link connection establishment request message to the first access network device; the radio link connection establishment request message is used to indicate the radio link connection establishment reason.

[0494] Optionally, the second access network device includes any one of the following:

[0495] On-board base station;

[0496] Distributed unit DU of the on-board base station;

[0497] On-board distributed unit DU of the base station;

[0498] Ground base station.

[0499] Figure 13 It is the second structural schematic diagram of the connection management device provided by the embodiments of the present application, including:

[0500] The second execution module 1300 is configured to perform any one of the following connection management operations when the service link between the second execution module and the terminal is unavailable:

[0501] Maintain the radio link connection with the terminal;

[0502] Suspend the radio connection;

[0503] Release the radio connection with the terminal;

[0504] When the service link is available, the first access network device performs at least one of the following connection management operations:

[0505] Resume data transmission with the terminal;

[0506] Resume the radio connection;

[0507] Re - establish the radio connection with the terminal.

[0508] Optionally, the terminal includes any one or more of the following:

[0509] A terminal with store - and - forward capabilities;

[0510] A terminal that transmits data through store - and - forward operations.

[0511] Optionally, the first access network device includes any one of the following:

[0512] An on - satellite base station;

[0513] The distributed unit (DU) of the on - satellite base station;

[0514] The on - satellite distributed unit (DU) of the base station.

[0515] Optionally, the second execution module 1300 is further configured to suspend data transmission with the terminal when the first access network device maintains a radio connection with the terminal;

[0516] Or,

[0517] Save context information when the first access network device releases the radio connection with the terminal.

[0518] Optionally, the second execution module 1300 is further configured to perform at least one of the following:

[0519] Send first auxiliary information to the terminal; the first auxiliary information is used for the terminal to suspend data transmission with the first access network device;

[0520] Send cell coverage stop time information corresponding to the first access network device to the terminal; the cell coverage stop time information is used for the terminal to suspend data transmission with the first access network device.

[0521] Optionally, the first auxiliary information includes at least one of the following:

[0522] First indication information; the first indication information is used to indicate that the terminal suspends data transmission with the first access network device;

[0523] The second indication information, which is used to indicate that the service link is unavailable;

[0524] The start time information of the suspended data transmission;

[0525] The duration information of the suspended data transmission;

[0526] The end time information of the suspended data transmission;

[0527] The time information when the service link will be available next time.

[0528] Optionally, the second execution module 1300 is specifically configured to send the first auxiliary information to the terminal through dedicated signaling.

[0529] Optionally, the second execution module 1300 is specifically configured to send the cell coverage stop time information to the terminal through system messages.

[0530] Optionally, the second execution module 1300 is specifically configured to perform at least one of the following:

[0531] Send a downlink non-access stratum (NAS) message to the terminal;

[0532] Send downlink service data to the terminal;

[0533] Send feedback information related to the uplink service data to the terminal;

[0534] Receive an uplink NAS message sent by the terminal;

[0535] Receive uplink service data sent by the terminal;

[0536] Receive feedback information related to the downlink service data sent by the terminal.

[0537] Optionally, the second execution module 1300 is specifically configured to perform at least one of the following:

[0538] Send the corresponding ephemeris information to the terminal; the ephemeris information is used for the terminal to obtain the service link available time information;

[0539] Send the service link available time information to the terminal;

[0540] Provide the arrival time information of the cell covered by the first access network device to the terminal, and the arrival time information of the cell covered by the first access network device is used for the terminal to obtain the service link available time information.

[0541] Optionally, the service link available time information includes any one of the following:

[0542] The first time information; the first time information is the time when the service link between the terminal and the first access network device is available;

[0543] The first start time information; the first start time information is used to indicate the start time when the service link is unavailable;

[0544] The first end time information, the first end time information is used to indicate the end time when the service link is unavailable;

[0545] The first duration information; the first duration information is used to indicate the duration when the service link is unavailable.

[0546] Optionally, the second execution module 1300 is specifically configured to provide service link available time information to the terminal before the service link becomes unavailable.

[0547] Optionally, the second execution module 1300 is specifically configured to provide service link available time information to the terminal through a system message or a dedicated message.

[0548] Optionally, the second execution module 1300 is further configured to perform at least one of the following:

[0549] Perform uplink synchronization with the terminal;

[0550] Perform downlink synchronization with the terminal.

[0551] Optionally, the second execution module 1300 is further configured to perform at least one of the following:

[0552] Send auxiliary information to the terminal; the auxiliary information is used for the terminal to release the radio link connection with the first access network device;

[0553] Send corresponding cell coverage stop time information to the terminal; the cell coverage stop time information is used for the terminal to release the radio link connection with the first access network device.

[0554] Optionally, the auxiliary information includes reason information for releasing the radio link connection; the reason information includes at least one of the following:

[0555] The service link is disconnected;

[0556] The service link is unavailable;

[0557] The store-and-forward communication mode.

[0558] Optionally, the second execution module 1300 is further configured to perform at least one of the following:

[0559] Provide service link available time information to the terminal; the service link available time information is used for the terminal to re-establish the radio link connection with the terminal;

[0560] Send a paging message to the terminal; the paging message is used for the terminal to re-establish the radio link connection with the first access network device;

[0561] Send a short message to the terminal; the short message is used for the terminal to re - establish an air interface connection with the first access network device.

[0562] Optionally, the second execution module 1300 is further configured to perform at least one of the following:

[0563] Send corresponding ephemeris information to the terminal; the ephemeris information is used for the terminal to obtain service link available time information;

[0564] Send service link available time information to the terminal;

[0565] Provide the arrival time information of the cell covered by the first access network device to the terminal; the arrival time information of the cell covered by the first access network device is used for the terminal to obtain service link available time information.

[0566] Optionally, the paging message includes paging cause information; the paging cause information includes at least one of the following: store - and - forward communication mode and downlink data arrival.

[0567] Optionally, the paging message includes a paging cause indication field; the cause indication field includes the paging cause information.

[0568] Optionally, the short message includes paging cause information; the paging cause information includes at least one of the following: store - and - forward communication mode and downlink data arrival.

[0569] Optionally, the second execution module 1300 is further configured to receive the air interface connection establishment reason indicated by the terminal; the air interface connection establishment reason includes: store - and - forward communication mode.

[0570] Optionally, the second execution module 1300 is specifically configured to perform at least one of the following:

[0571] Receive the air interface connection establishment reason sent by the terminal;

[0572] Receive the air interface connection establishment request message sent by the terminal; the air interface connection establishment request message is used to indicate the air interface connection establishment reason.

[0573] Optionally, the second access network device includes any one of the following:

[0574] On - satellite base station;

[0575] Distributed unit DU of the on - satellite base station;

[0576] On - satellite distributed unit DU of the base station;

[0577] Ground base station.

[0578] The virtual device in the embodiments of the present application may be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal or other devices other than terminals. Exemplarily, the terminal may include, but is not limited to, the types of the terminal 11 listed above, and other devices may be servers, Network Attached Storage (NAS), etc., which are not specifically limited in the embodiments of the present application.

[0579] The virtual device provided by the embodiments of the present application can implement Figures 5 to 11 each process implemented by the method embodiments and achieve the same technical effects. To avoid repetition, details are not described here again.

[0580] As Figure 14 shown, the embodiments of the present application further provide a communication device 1400, including a processor 1401 and a memory 1402. A program or instruction that can run on the processor 1401 is stored on the memory 1402. For example, when the communication device 1400 is a terminal, when the program or instruction is executed by the processor 1401, each step of the above connection management method embodiment is implemented, and the same technical effects can be achieved. When the communication device 1400 is a network-side device, when the program or instruction is executed by the processor 1401, each step of the above connection management method embodiment is implemented, and the same technical effects can be achieved. To avoid repetition, details are not described here again.

[0581] The embodiments of the present application further provide a terminal, including a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run a program or instruction to implement the steps in the method embodiment as Figure 5 shown. This terminal embodiment corresponds to the above terminal-side method embodiment. Each implementation process and implementation manner of the above method embodiment can be applied to this terminal embodiment, and the same technical effects can be achieved. Specifically, Figure 15 is a schematic diagram of the hardware structure of a terminal for implementing the embodiments of the present application.

[0582] The terminal 1500 includes, but is not limited to, at least some components such as a radio frequency unit 1501, a network module 1502, an audio output unit 1503, an input unit 1504, a sensor 1505, a display unit 1506, a user input unit 1507, an interface unit 1508, a memory 1509, and a processor 1510.

[0583] Those skilled in the art can understand that the terminal 1500 may further include a power source (such as a battery) for supplying power to each component. The power source can be logically connected to the processor 1510 through a power management system, so as to implement functions such as management of charging, discharging, and power consumption management through the power management system.Figure 15 The terminal structure shown does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or combine some components, or have different component arrangements, which will not be elaborated here.

[0584] It should be understood that in the embodiments of the present application, the input unit 1504 may include a Graphics Processing Unit (GPU) 15041 and a microphone 15042. The graphics processing unit 15041 processes the image data of static pictures or videos obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 1506 may include a display panel 15061, and the display panel 15061 may be configured in the form of a liquid crystal display, an organic light-emitting diode, etc. The user input unit 1507 includes at least one of a touch panel 15071 and other input devices 15072. The touch panel 15071 is also called a touch screen. The touch panel 15071 may include two parts: a touch detection device and a touch controller. The other input devices 15072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, which will not be elaborated here.

[0585] In the embodiments of the present application, after receiving downlink data from a network-side device, the radio frequency unit 1501 may transmit it to the processor 1510 for processing; in addition, the radio frequency unit 1501 may send uplink data to the network-side device. Generally, the radio frequency unit 1501 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, etc.

[0586] The memory 1509 can be used to store software programs or instructions and various data. The memory 1509 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data. Among them, the first storage area may store an operating system, application programs or instructions required for at least one function (such as a sound playback function, an image playback function, etc.). In addition, the memory 1509 may include a volatile memory or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDR SDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synch link dynamic random access memory (SLDRAM), and a direct rambus random access memory (DRRAM). The memory 1509 in the embodiments of the present application includes, but is not limited to, these and any other suitable types of memories.

[0587] The processor 1510 may include one or more processing units; optionally, the processor 1510 integrates an application processor and a modem processor. Among them, the application processor mainly processes operations related to the operating system, user interface, and application programs, etc., and the modem processor mainly processes wireless communication signals, such as a baseband processor. It can be understood that the above modem processor may not be integrated into the processor 1510 either.

[0588] The embodiments of the present application also provide a network-side device, including a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the steps of the method embodiments as Figure 6 shown. The embodiments of this network-side device correspond to the above method embodiments of the network-side device. Each implementation process and implementation manner of the above method embodiments can be applied to the embodiments of this network-side device, and the same technical effects can be achieved.

[0589] Specifically, the embodiment of the present application further provides an access network device. As Figure 16 shown, the access network device 1600 includes: an antenna 161, a radio frequency device 162, a baseband device 163, a processor 164, and a memory 165. The antenna 161 is connected to the radio frequency device 162. In the uplink direction, the radio frequency device 162 receives information through the antenna 161 and sends the received information to the baseband device 163 for processing. In the downlink direction, the baseband device 163 processes the information to be sent and sends it to the radio frequency device 162. After processing the received information, the radio frequency device 162 sends it out through the antenna 161.

[0590] In the above embodiments, the method executed by the network side device can be implemented in the baseband device 163, and the baseband device 163 includes a baseband processor.

[0591] The baseband device 163 may include, for example, at least one baseband board, and a plurality of chips are provided on the baseband board. As Figure 16 shown, one of the chips is, for example, a baseband processor, which is connected to the memory 165 through a bus interface to call the program in the memory 165 and execute the network device operations shown in the above method embodiments.

[0592] The network side device may further include a network interface 166, and this interface is, for example, a Common Public Radio Interface (CPRI).

[0593] Specifically, the network side device 1600 of the embodiment of the present application further includes: instructions or programs stored on the memory 165 and executable on the processor 164. The processor 164 calls the instructions or programs in the memory 165 to execute the methods executed by each module and achieves the same technical effects. To avoid repetition, it will not be elaborated here.

[0594] The embodiment of the present application further provides a readable storage medium. Programs or instructions are stored on the readable storage medium. When the programs or instructions are executed by a processor, each process of the above connection management method embodiment is implemented, and the same technical effects can be achieved. To avoid repetition, it will not be elaborated here.

[0595] Wherein, the processor is the processor in the terminal in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory ROM, random access memory RAM, magnetic disks, or optical discs, etc. In some examples, the readable storage medium may be a non-transitory readable storage medium.

[0596] Another embodiment of the present application further provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is configured to run programs or instructions to implement each process of the above-described embodiment of the connection management method, and can achieve the same technical effects. To avoid repetition, details are not described herein again.

[0597] It should be understood that the chip mentioned in the embodiment of the present application may also be referred to as a system-on-chip, system chip, chip system, or system-on-chip.

[0598] Another embodiment of the present application further provides a computer program / program product. The computer program / program product is stored in a storage medium. The computer program / program product is executed by at least one processor to implement each process of the above-described embodiment of the connection management method, and can achieve the same technical effects. To avoid repetition, details are not described herein again.

[0599] The embodiment of the present application further provides a communication system, including: a terminal and an access network device. The terminal can be used to execute the steps of the connection management method as described above, and the access network device can be used to execute the steps of the connection management method as described above.

[0600] It should be noted that in this article, the terms "include", "comprise" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0601] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described embodiment methods can be implemented by means of a computer software product plus a necessary general hardware platform, and of course, can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes several instructions for causing a terminal or a network-side device to execute the methods described in various embodiments of the present application.

[0602] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms of embodiments without departing from the purpose of the present application and the scope protected by the claims. These embodiments are all within the protection scope of the present application.

Claims

1. A connection management method, characterized in that, including: When the service link between the terminal and the first access network device is unavailable, the terminal performs any one of the following connection management operations: Maintain the radio connection with the first access network device; Suspend the radio connection; Release the radio connection with the first access network device; When the service link is available, the terminal performs at least one of the following connection management operations: Resume data transmission with the first access network device; Resume the radio connection; Re - establish the radio connection with the first access network device.

2. The connection management method according to claim 1, characterized in that The suspension of the radio connection includes: The terminal suspends the radio connection when the access stratum (AS) security is activated. The resume of the radio connection includes: The terminal resumes the radio connection when the access stratum (AS) security is activated.

3. The connection management method according to claim 1 or 2, wherein The service link and the feeder link are not available simultaneously; the feeder link is the feeder link between the first access network device and the core network device corresponding to the terminal.

4. The connection management method according to any one of claims 1 to 3, characterized in that, The terminal includes any one or more of the following: A terminal with store - and - forward capabilities; A terminal that transmits data through store - and - forward operations.

5. The connection management method according to any one of claims 1-4, characterized in that The first access network device includes any one of the following: An on - satellite base station; A distributed unit (DU) of an on - satellite base station; An on - satellite distributed unit (DU) of a base station.

6. The connection management method according to any one of claims 1-5, characterized in that, The method further includes: When the terminal maintains the radio connection with the first access network device, the terminal suspends data transmission with the first access network device; Or, When the terminal releases the radio connection with the first access network device, the terminal saves the context information of the terminal.

7. The connection management method according to claim 6, characterized in that The suspension of data transmission with the first access network device includes at least one of the following: The terminal suspends data transmission with the first access network device according to the first auxiliary information sent by the first access network device; The terminal suspends data transmission with the first access network device according to the cell coverage stop time information corresponding to the first access network device.

8. The connection management method according to claim 7, characterized in that The first auxiliary information includes at least one of the following: First indication information; the first indication information is used to indicate that the terminal suspends data transmission with the first access network device; Second indication information, the second indication information is used to indicate that the service link is unavailable; Start time information for suspending data transmission; Duration information for suspending data transmission; End time information for suspending data transmission; Time information for the next availability of the service link.

9. The connection management method according to claim 7 or 8, characterized in that The terminal suspends data transmission with the first access network device according to the first auxiliary information sent by the first access network device, including: The terminal suspends data transmission with the first access network device according to the first auxiliary information sent by the first access network device through dedicated signaling.

10. The connection management method according to any one of claims 7-9, characterized in that, The terminal suspends data transmission with the first access network device according to the cell coverage stop time information corresponding to the first access network device, including: The terminal suspends data transmission with the first access network device according to the cell coverage stop time information sent by the first access network device through system messages.

11. The connection management method according to any one of claims 1-10, characterized in that, When the service link is unavailable, the method further includes any one of the following: The terminal attempts to camp on a cell covered by a second access network device; The terminal stops attempting to camp on a cell covered by a second access network device.

12. The connection management method according to claim 11, wherein The terminal stops attempting to camp on a cell covered by a second access network device, including at least one of the following: The terminal stops searching for a cell covered by the second access network device; The terminal stops camping on a cell covered by the second access network device; The terminal stops link monitoring with the second access network device; The terminal suspends access stratum (AS) operations related to the first access network device.

13. The connection management method according to claim 11 or 12, characterized in that, The terminal attempts to camp on a cell covered by a second access network device, including at least one of the following: The terminal suspends AS operations related to the first access network device; The terminal performs cell selection and / or cell reselection; The terminal camps on a cell covered by the second access network device; The terminal receives a paging message sent by the second access network device; The terminal receives system information sent by the second access network device.

14. The connection management method according to any one of claims 1-13, characterized in that, The resumption of data transmission with the first access network device includes at least one of the following: The terminal obtains service link available time information and resumes data transmission with the first access network device according to the service link available time information; The terminal resumes data transmission with the first access network device when camping again on a cell covered by the first access network device.

15. The connection management method according to any one of claims 1-14, characterized in that The resumption of data transmission with the first access network device includes resuming at least one of the following: Receiving a downlink non-access stratum (NAS) message sent by the first access network device; Receiving downlink service data sent by the first access network device; Receiving feedback information related to uplink service data sent by the first access network device; Sending an uplink NAS message to the first access network device; Sending uplink service data to the first access network device; Sending feedback information related to downlink service data to the first access network device.

16. The connection management method according to claim 14 or 15, characterized in that The terminal obtains service link available time information, including at least one of the following: The terminal obtains the service link available time information based on the ephemeris information corresponding to the first access network device; The terminal obtains the service link available time information based on the service link available time information sent by the first access network device received; The terminal obtains the service link available time information according to the arrival time information of the cell covered by the first access network device provided by the second access network device.

17. The connection management method according to any one of claims 14-16, characterized in that, The service link available time information includes any one of the following: First time information; the first time information is the time when the service link between the terminal and the first access network device is available; First start time information; the first start time information is used to indicate the start time when the service link is unavailable; First end time information, the first end time information is used to indicate the end time when the service link is unavailable; First duration information; The first duration information is used to indicate the duration when the service link is unavailable.

18. The connection management method according to any one of claims 14-17, characterized in that The service link available time information is provided by the first access network device to the terminal before the service link becomes unavailable.

19. The connection management method according to claim 17, characterized in that, The method further includes: The terminal sets a timer; the start time of the timer corresponds to the start time when the service link is unavailable; the time length of the timer is the same as the duration when the service link is unavailable.

20. The connection management method according to claim 19, wherein When the timer expires, the terminal considers that the service link between the terminal and the first access network device is available.

21. The connection management method according to any one of claims 14-20, characterized in that, The service link availability time information is carried by a system message or a dedicated message.

22. The connection management method according to any one of claims 14-21, characterized in that, The method further includes at least one of the following: The terminal learns that it re - camps on the first access network device based on the identification information of the satellite. The terminal learns that it re - camps on the first access network device based on the identification information of the access network device.

23. The connection management method according to any one of claims 1-22, characterized in that, When the terminal resumes data transmission with the first access network device, it further includes at least one of the following: The terminal performs uplink synchronization with the first access network device. The terminal performs downlink synchronization with the first access network device.

24. The connection management method according to any one of claims 1-23, characterized in that Releasing the radio interface connection with the first access network device includes at least one of the following: The terminal releases the radio interface connection with the first access network device according to the auxiliary information sent by the first access network device. The terminal releases the radio interface connection with the first access network device according to the cell coverage stop time information corresponding to the first access network device.

25. The connection management method according to claim 24, wherein The auxiliary information includes the reason information for releasing the radio interface connection; the reason information includes at least one of the following: Service link disconnection; Service link unavailability; Store - and - forward communication mode.

26. The connection management method according to any one of claims 1-25, characterized in that, The context information of the terminal includes at least one of the following: The AS context information of the terminal; The NAS context information of the terminal.

27. The connection management method according to any one of claims 1-26, characterized in that, Re - establishing the radio interface connection with the first access network device includes at least one of the following: The terminal obtains the service link availability time information and re - establishes the radio interface connection with the first access network device according to the service link availability time information. When the terminal re - camps on the first access network device, it re - establishes the radio interface connection with the first access network device. The terminal re - establishes the radio interface connection with the first access network device according to the paging message sent by the first access network device. The terminal re - establishes the radio interface connection with the first access network device according to the short message sent by the first access network device.

28. The connection management method according to claim 27, characterized in that, The terminal obtains the service link availability time information, including at least one of the following: The terminal obtains the service link availability time information based on the ephemeris information corresponding to the first access network device. The terminal obtains the service link availability time information based on the service link availability time information received from the first access network device. The terminal obtains the service link availability time information according to the arrival time information of the cell covered by the first access network device provided by the second access network device.

29. The connection management method according to claim 27 or 28, characterized in that The paging message includes paging reason information; the paging reason information includes at least one of the following: store - and - forward communication mode and downlink data arrival.

30. The connection management method according to claim 29, wherein The paging message includes a paging reason indication field; the reason indication field includes the paging reason information.

31. The connection management method according to any one of claims 27-30, characterized in that The short message includes paging cause information; the paging cause information includes at least one of the following: store-and-forward communication mode and downlink data arrival.

32. The connection management method according to any one of claims 1-31, characterized in that, The re-establishment of the radio link with the first access network device includes any one of the following: The NAS of the terminal triggers the AS of the terminal to re-establish the radio link with the first access network device; The AS of the terminal triggers the re-establishment of the radio link with the first access network device.

33. The connection management method according to any one of claims 1-32, characterized in that, The method further includes: The terminal indicates the radio link establishment reason to the first access network device; the radio link establishment reason includes: store-and-forward communication mode.

34. The connection management method according to claim 33, wherein The terminal indicates the radio link establishment reason to the first access network device, including any one of the following: The terminal sends the radio link establishment reason to the first access network device; The terminal sends a radio link establishment request message to the first access network device; the radio link establishment request message is used to indicate the radio link establishment reason.

35. The connection management method according to any one of claims 11-13, 16 or 28, characterized in that The second access network device includes any one of the following: On-board base station; Distributed unit DU of the on-board base station; On-board distributed unit DU of the base station; Ground base station.

36. A connection management method, characterized in that, Including: In the case where the service link between the first access network device and the terminal is unavailable, the first access network device performs any one of the following connection management operations: Maintain the radio link with the terminal; Suspend the radio link; Release the radio link with the terminal; In the case where the service link is available, the first access network device performs at least one of the following connection management operations: Resume data transmission with the terminal; Resume the radio link; Re-establish the radio link with the terminal.

37. The connection management method according to claim 36, wherein The service link and the feeder link are not available simultaneously; the feeder link is the feeder link between the first access network device and the core network device corresponding to the terminal.

38. The connection management method according to claim 36 or 37, characterized in that, The terminal includes any one or more of the following: A terminal with store-and-forward capability; A terminal that transmits data through store-and-forward operations.

39. The connection management method according to any one of claims 36-38, characterized in that, The first access network device includes any one of the following: On-board base station; Distributed unit DU of the on-board base station; On-board distributed unit DU of the base station.

40. The connection management method according to any one of claims 36-39, characterized in that, The method further includes: In the case where the first access network device maintains the radio link with the terminal, the first access network device suspends data transmission with the terminal; Or, In the case where the first access network device releases the radio link with the terminal, the first access network device saves the context information.

41. The connection management method according to any one of claims 36-40, characterized in that, The method further includes at least one of the following: The first access network device sends first auxiliary information to the terminal; the first auxiliary information is used for the terminal to suspend data transmission with the first access network device; The first access network device sends the cell coverage stop time information corresponding to the first access network device to the terminal; The cell coverage stop time information is used for the terminal to suspend data transmission with the first access network device.

42. The connection management method according to claim 41, wherein, The first auxiliary information includes at least one of the following: First indication information; the first indication information is used to indicate that the terminal suspends data transmission with the first access network device; Second indication information, where the second indication information is used to indicate that the service link is unavailable; Start time information of the suspended data transmission; Duration information of the suspended data transmission; End time information of the suspended data transmission; Time information of the next availability of the service link.

43. The connection management method according to claim 41 or 42, characterized in that The first access network device sends first auxiliary information to the terminal, including: The first access network device sends the first auxiliary information to the terminal through dedicated signaling.

44. The connection management method according to any one of claims 41-43, characterized in that The first access network device sends the cell coverage stop time information corresponding to the first access network device to the terminal, including: The first access network device sends the cell coverage stop time information to the terminal through system information.

45. The connection management method according to any one of claims 36-44, characterized in that Restoring data transmission with the terminal includes restoring at least one of the following: Sending a downlink non-access stratum (NAS) message to the terminal; Sending downlink service data to the terminal; Sending feedback information related to uplink service data to the terminal; Receiving an uplink NAS message sent by the terminal; Receiving uplink service data sent by the terminal; Receiving feedback information related to downlink service data sent by the terminal.

46. The connection management method according to any one of claims 36-45, characterized in that, The method further includes at least one of the following: The first access network device sends corresponding ephemeris information to the terminal; the ephemeris information is used for the terminal to obtain service link availability time information; The first access network device sends service link availability time information to the terminal; A second access network device provides arrival time information of the cell covered by the first access network device to the terminal, and the arrival time information of the cell covered by the first access network device is used for the terminal to obtain service link availability time information.

47. The connection management method according to claim 46, characterized in that The service link availability time information includes any one of the following: First time information; the first time information is the time when the service link between the terminal and the first access network device is available; First start time information; the first start time information is used to indicate the start time when the service link is unavailable; First end time information, the first end time information is used to indicate the end time when the service link is unavailable; First duration information; The first duration information is used to indicate the duration when the service link is unavailable.

48. The connection management method according to claim 46 or 47, characterized in that, The first access network device provides the service link availability time information to the terminal before the service link becomes unavailable.

49. The connection management method according to any one of claims 46 to 48, characterized in that, The first access network device provides the service link availability time information to the terminal through system information or dedicated messages.

50. The connection management method according to any one of claims 36-49, characterized in that, When the first access network device restores data transmission with the terminal, it further includes at least one of the following: The first access network device performs uplink synchronization with the terminal; The first access network device performs downlink synchronization with the terminal.

51. The connection management method according to any one of claims 46-50, characterized in that, The method further includes at least one of the following: The first access network device sends auxiliary information to the terminal; the auxiliary information is used for the terminal to release the radio interface connection with the first access network device; The first access network device sends the corresponding cell coverage stop time information to the terminal; The cell coverage stop time information is used for the terminal to release the radio interface connection with the first access network device.

52. The connection management method according to claim 51, wherein, The auxiliary information includes the cause information for the radio link connection release; the cause information includes at least one of the following: The service link is disconnected; The service link is unavailable; The store-and-forward communication mode.

53. The connection management method according to any one of claims 36-52, characterized in that, The method further includes at least one of the following: The first access network device provides the terminal with service link available time information; the service link available time information is used for the terminal to re-establish a radio link connection with the terminal; The first access network device sends a paging message to the terminal; The paging message is used for the terminal to re-establish a radio link connection with the first access network device; The first access network device sends a short message to the terminal; the short message is used for the terminal to re-establish a radio link connection with the first access network device.

54. The connection management method according to claim 53, wherein The first access network device provides the terminal with service link available time information, including at least one of the following: The first access network device sends corresponding ephemeris information to the terminal; the ephemeris information is used for the terminal to obtain the service link available time information; The first access network device sends the service link available time information to the terminal; The second access network device provides the terminal with the arrival time information of the cell covered by the first access network device; The arrival time information of the cell covered by the first access network device is used for the terminal to obtain the service link available time information.

55. The connection management method according to claim 53 or 54, characterized in that, The paging message includes paging cause information; the paging cause information includes at least one of the following: the store-and-forward communication mode and the arrival of downlink data.

56. The connection management method according to claim 55, wherein The paging message includes a paging cause indication field; the cause indication field includes the paging cause information.

57. The connection management method according to any one of claims 53-56, characterized in that The short message includes paging cause information; the paging cause information includes at least one of the following: the store-and-forward communication mode and the arrival of downlink data.

58. The connection management method according to any one of claims 36-57, characterized in that The method further includes: The first access network device receives the radio link connection establishment cause indicated by the terminal; the radio link connection establishment cause includes: the store-and-forward communication mode.

59. The connection management method according to claim 58, characterized in that, The first access network device receives the radio link connection establishment cause indicated by the terminal, including any one of the following: The first access network device receives the radio link connection establishment cause sent by the terminal; The first access network device receives a radio link connection establishment request message sent by the terminal; the radio link connection establishment request message is used to indicate the radio link connection establishment cause.

60. The connection management method according to claim 46 or 54, characterized in that, The second access network device includes any one of the following: An on-board base station; A distributed unit DU of the on-board base station; An on-board distributed unit DU of the base station; A ground base station.

61. A connection management device, characterized in that, Including: A first execution module, configured to perform any one of the following connection management operations when the service link between the first access network device and the first access network device is unavailable: Maintain a radio link connection with the first access network device; Suspend the radio link connection; Release the radio link connection with the first access network device; When the service link is available, perform at least one of the following connection management operations: Resume data transmission with the first access network device; Resume the radio link connection; Re-establish a radio link connection with the first access network device.

62. A connection management device, characterized in that, Including: A second execution module, configured to perform any one of the following connection management operations when the service link with the terminal is unavailable: Maintain an air interface connection with the terminal; Suspend the air interface connection; Release the air interface connection with the terminal; When the service link is available, perform at least one of the following connection management operations: Resume data transmission with the terminal; Resume the air interface connection; Re - establish the air interface connection with the terminal.

63. A terminal, characterized in that, Comprising a processor and a memory, the memory stores programs or instructions that can run on the processor, and when the programs or instructions are executed by the processor, the steps of the connection management method according to any one of claims 1 to 35 are implemented.

64. An access network device, characterized in that, Comprising a processor and a memory, the memory stores programs or instructions that can run on the processor, and when the programs or instructions are executed by the processor, the steps of the connection management method according to any one of claims 36 to 60 are implemented.

65. A readable storage medium, characterized in that, Programs or instructions are stored on the readable storage medium, and when the programs or instructions are executed by a processor, the connection management method according to any one of claims 1 to 35 is implemented, or the steps of the connection management method according to any one of claims 36 to 60 are implemented.

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