Communication method and communication device

Abstract

The invention provides a communication method and a communication device. The communication method comprises the following steps: the terminal equipment sends a first request to first access network equipment, wherein the first request is used for indicating the terminal equipment to request to access a core network; the terminal equipment establishes connection with second access network equipment; and the terminal equipment receives first information from the second access network equipment, wherein the first information is information replied to the terminal equipment by the core network based on the first request. According to the technical scheme, the terminal equipment can be helped to continue to complete the process of accessing the core network under the scene that the terminal equipment is disconnected from the first access network equipment when the terminal equipment does not receive the first information, namely under the condition that the terminal equipment does not access the core network.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of communications, and in particular, to a communication method and a communication device. Background Art

[0002] Currently, a satellite network architecture with regenerative payload has been proposed in the field of communications. In the satellite network architecture with regenerative payload, base stations are deployed on satellites, and ground mobile terminals access the core network through base stations deployed on satellites and ground stations deployed on the ground. Among them, the connection between the terminal and the base station is called an access connection, and the connection between the base station and the ground station is called a feeder connection.

[0003] In the satellite network architecture with regenerative payload, the following problems may occur: In the process of the terminal initially accessing the core network, after the terminal sends an initial access request for requesting access to the core network, the terminal device has not received a reply message from the core network and has disconnected from the current base station, that is, the terminal device has disconnected from the current base station before completing the process of accessing the core network. For example, when the terminal sends an initial access request to the base station, the feeder connection between the base station and the ground station is unavailable. At this time, the terminal device needs to wait at least for the time when the feeder connection between the base station and the ground station is restored to receive a reply message from the core network, and during this period, it is possible that the terminal device disconnects from the base station.

[0004] At this time, how to ensure that the terminal can receive the reply message sent by the core network device to the terminal to complete the network access of the terminal device has become a technical problem to be solved urgently. Summary of the Invention

[0005] The present application provides a communication method and a communication device, aiming to enable the terminal device to receive the reply message sent by the core network device to the terminal in the scenario where the terminal device disconnects from the current base station before accessing the core network, so as to help the terminal device continue to complete network access.

[0006] In a first aspect, the present application provides a communication method. This method can be executed by a terminal device, or by components (such as chips, chip systems, etc.) configured in the terminal device, or, it can also be a logical module or software that can implement all or part of the functions of the terminal device. The present application does not make any limitations in this regard.

[0007] Exemplarily, the method includes: sending a first request to a first access network device, where the first request is used to indicate that the terminal device requests to access the core network; establishing a connection with a second access network device and sending the identifier of the terminal device to the second access network device; receiving first information from the second access network device, where the first information is the information replied by the core network to the terminal device based on the first request, and the first information corresponds to the identifier of the terminal device.

[0008] Exemplarily, in the process of the terminal device accessing the core network, the first information is any one of the following information replied by the core network device to the terminal device based on the first request sent by the terminal device: information for indicating acceptance of the terminal device accessing the core network (such as attach accept, registration accept, etc.), authentication request, N1 message, non-access stratum message (NAS message), etc.

[0009] Exemplarily, after sending the first request to the first access network device and before establishing a connection with the second access network device, the terminal device disconnects from the first access network device (for example, RRC connection, transport layer connection, the terminal device leaves the coverage area of the first access network device).

[0010] In this application, the first access network device and the second access network device are deployed on a satellite.

[0011] It can be understood that for the first access network device, after receiving the first request, it will send the first request to the core network device when the power supply connection is available. Correspondingly, for the core network device, after receiving the first request, there will be information for replying to the first request. In this application, the replied information is referred to as the first information.

[0012] Specifically, in this application, for the core network side, after receiving the first request, it will determine the second access network device for storing and forwarding the replied first information, and then instruct the second access network device to reply the first information to the terminal device. For the terminal device side, it will establish a connection with the second access network device that stores the first information and send the identifier of the terminal device to the second access network device. In this way, the second access network device can determine the first information replied by the core network corresponding to the identifier of the terminal device based on the identifier of the terminal device, and then send the first information to the terminal device.

[0013] In this application, the identifier of the terminal device is used to identify the terminal device that sends the first request in the initial access process. Exemplarily, the identifier of the terminal device may be an international mobile subscriber identification (IMSI), a subscription permanent identifier (SUPI), a subscription concealed identifier (SUCI), a globally unique temporary identification (GUTI), a temporary mobile subscriber identity (TMSI), a cell radio network temporary identifier (C-RNTI), an inactive radio network temporary identifier (I-RNTI), a combination of C-RNTI and a RAN identifier, a combination of I-RNTI and a RAN identifier, etc.

[0014] It can be understood that through this technical solution, even if the terminal device disconnects from the first access network device, since the terminal device will establish a connection with the second access network device that stores the first information and send the identifier of the terminal device to the second access network device, the second access network device can determine the first information replied by the core network device to the terminal device based on the identifier of the terminal device, and then send the first information to the terminal device. Therefore, it can help the terminal device complete the process of accessing the core network.

[0015] Combined with the first aspect, in a possible implementation, the second access network device and the first access network device are the same access network device, or the second access network device and the first access network device are different access network devices.

[0016] Among them, when the second access network device and the first access network device are the same access network device, it means that the access network device that sends the first information replied by the core network device to the terminal device is the first access network device that receives the first request. Another description: The terminal device sends a first request to the first access network device, and then establishes a connection with the first access network device again, and receives the first information replied by the core network device and forwarded by the first access network device to the terminal device.

[0017] Among them, the second access network device and the first access network device are different access network devices, that is, it means that the access network device that sends the first information replied by the core network device to the terminal device is not the same access network device as the access network device that receives the first request.

[0018] Combined with the first aspect, in a possible implementation manner, the above method further includes: receiving second information sent by the first access network device, where the second information is used to indicate a first duration; establishing a connection with the second access network device, including: after the first duration, establishing a connection with the second access network device.

[0019] In this technical solution, after the first access network device receives the first request, the first access network device will determine a second access network device that can send the first information replied by the core network device to the terminal device, and determine the first duration. Among them, after the first duration ends, the terminal device can establish a connection with the second access network device.

[0020] That is to say, in this technical solution, the second access network device is the access network device from which the broadcast message that the terminal device can detect after the first duration ends comes. Or from another perspective, the first access network device indicating the first duration can be considered as indicating to the terminal device the second access network device to which a connection needs to be established. Further, it can also be considered as being used to indicate to the terminal device the second access network device that stores the first information replied by the core network.

[0021] That is, in this technical solution, the first access network device determines the second access network device that stores and forwards the first information replied by the core network device, and then indicates the first duration to the terminal device, so that the terminal device establishes a connection with the second access network device that stores the first information and sends the identifier of the terminal device to the second access network device, thereby realizing obtaining the first information replied by the core network device and helping the terminal device complete the process of accessing the core network.

[0022] Combined with the first aspect, in a possible implementation manner, the first duration is determined by the first access network device based on ephemeris information.

[0023] Optionally, the first access network device may also determine the first duration through ephemeris information and at least one of the following information: the position of the satellite on which the second access network device is deployed, the position of the terminal device, and the current time.

[0024] Combined with the first aspect, in a possible implementation manner, the above method further includes: obtaining a first identifier, where the first identifier is used to identify the second access network device; establishing a connection with the second access network device, including: when receiving the first identifier from the second access network device, establishing a connection with the second access network device.

[0025] Among them, when receiving the first identifier from the second access network device, establishing a connection with the second access network device can also be replaced with: when receiving a message including the first identifier, establishing a connection with the access network device that sends the message. It can be understood that at this time, the access network device that sends the message is the second access network device.

[0026] Optionally, in some implementation manners, obtaining the first identifier includes: receiving the first identifier from the first access network device. In this implementation manner, the first access network device determines the second access network device that stores and forwards the first information replied by the core network device, and then indicates to the terminal device the first identifier for identifying the second access network device, so that the terminal device establishes a connection with the second access network device that stores the first information, thereby obtaining the first information replied by the core network device and helping the terminal device complete the process of accessing the core network.

[0027] Among them, when the first access network device sends the first identifier to the terminal device, it can be considered that the second access network device to which a connection needs to be established is indicated to the terminal device. Further, it can also be considered that it is used to indicate to the terminal device the second access network device that stores the first information replied by the core network.

[0028] Optionally, in some implementation manners, obtaining the first identifier includes: determining the first identifier according to ephemeris information.

[0029] Exemplarily, the terminal device determines the first identifier based on the ephemeris information and at least one of the following information: the location of the terminal device, the current time.

[0030] Combined with the first aspect, in a possible implementation manner, after the terminal device determines the first identifier, the terminal device can also send the first identifier to the first access network device, so as to send the first identifier to the core network device through the first access network device.

[0031] In this technical solution, after the terminal device determines the first identifier of the store-and-forward second access network device, it will send the first identifier to the core network device through the first access network device, so that the core network device determines the second access network device that stores and forwards the first information replied by the core network device, thereby ensuring that the access network device that receives the first information from the core network device and the access network device to which the terminal device establishes a connection are the same access network device, so as to ensure that the terminal device can obtain the first information replied by the core network device after establishing the connection. That is to say, when the terminal device sends the first identifier to the first access network device, the first identifier can be considered to be used to indicate the second access network device that sends the first information.

[0032] In combination with the first aspect, in a possible implementation manner, the above method further includes: establishing a connection with a third access network device; if the first information sent by the third access network device is not received within the second time period, releasing the connection with the third access network device.

[0033] In this embodiment, the third access network device can be considered as an access network device that does not store the first information replied by the core network device.

[0034] In this technical solution, if the terminal device also receives a broadcast message from the third access network device, the terminal device will also establish a connection with the third access network device at this time; correspondingly, for the third access network device, since it does not store the first information replied by the core network device, the third access network device will not send the first information to the terminal device. Therefore, in this technical solution, when the terminal device does not receive the first information sent by the third access network device within the second time period, it can determine that the first information replied by the core network device is not stored in the third access network device, and then release the connection with the third access network device.

[0035] Optionally, the terminal device may send third information to the third access network device, where the third information is used to instruct the third access network device to send the information replied by the core network device to the terminal device; receive fourth information sent by the third access network device in response to the third information, where the fourth information is used to instruct the terminal device to release the connection with the third access network device; release the connection with the third access network device.

[0036] In this technical solution, the terminal device uses the third information to indicate to the third access network device that it needs the information replied by the core network device to the terminal device; correspondingly, after the third access network device determines that it does not store the first information, it instructs the terminal device to release the connection with the third access network device.

[0037] In combination with the first aspect, in a possible implementation manner, the above method further includes: sending fifth information to the second access network device, where the fifth information is used to instruct the second access network device to send the information replied by the core network device to the terminal device.

[0038] In this technical solution, the terminal device uses the fifth information to indicate to the second access network device that it needs the information replied by the core network device to the terminal device. Correspondingly, in response to the fifth information, the second access network device sends the first information replied by the core network device to the terminal device.

[0039] Second aspect, the present application provides a communication method applied to a first access network device, including: receiving a first request for indicating that a terminal device requests to access a core network; sending second information to the terminal device, where the second information is used to indicate a first duration, and after the first duration ends, the terminal device establishes a connection with a second access network device, and the second access network device is used to store first information replied by the core network device to the terminal device based on the first request; sending the first request to the core network device.

[0040] Wherein, when the terminal device establishes a connection with the second access network device after the first duration ends, the terminal device also sends an identifier of the terminal device to the second access network device.

[0041] It should be noted that the second access network device is used to store the first information replied by the core network device to the terminal device based on the first request, which does not mean that the first information has been stored in the second access network device. For example, the time when the second access network device stores the first information can be after the first access network device sends the second information to the terminal device.

[0042] In this technical solution, the first access network device determines the second access network device that stores and forwards the first information replied by the core network device, and then indicates the first duration to the terminal device, so that the terminal device establishes a connection with the second access network device that stores the first information, thereby obtaining the first information replied by the core network device and helping the terminal device complete the process of accessing the core network.

[0043] In combination with the second aspect, in a possible implementation manner, the second access network device and the first access network device are the same access network device, or the second access network device and the first access network device are different access network devices.

[0044] In combination with the second aspect, in a possible implementation manner, when the second access network device and the first access network device are different access network devices, the method further includes: sending an identifier of the second access network device to the core network device.

[0045] In combination with the second aspect, in a possible implementation manner, the first duration is determined by the first access network device based on ephemeris information.

[0046] Exemplarily, the first access network device determines the first duration based on ephemeris information and at least one of the following information: satellite position, position of the terminal device, current time.

[0047] In combination with the second aspect, in a possible implementation manner, when the second access network device is the first access network device, the method further includes: receiving fifth information from the terminal device, where the fifth information is used to indicate sending information replied by the core network device to the terminal device.

[0048] In a third aspect, the present application provides a communication method applied to a first access network device, including: receiving a first request for indicating that a terminal device requests to access the core network; sending a first identifier to the terminal, where the first identifier is used to identify a second access network device, and the second access network device is used to store first information replied by the core network device to the terminal device based on the first request; and sending the first request to the core network device.

[0049] In this technical solution, the first access network device determines the second access network device that stores and forwards the first information replied by the core network device, and then indicates the first identifier for identifying the second access network device to the terminal device, so that the terminal device establishes a connection with the second access network device that stores the first information and sends the identifier of the terminal device to the second access network device, thereby obtaining the first information replied by the core network device and helping the terminal device complete the process of accessing the core network.

[0050] In combination with the third aspect, in a possible implementation manner, the method further includes: sending the first identifier to the core network device, where the first identifier is used for the core network device to determine to send the first information to the terminal device through the second access network device.

[0051] In combination with the third aspect, in a possible implementation manner, the second access network device and the first access network device are the same access network device, or the second access network device and the first access network device are different access network devices.

[0052] In combination with the third aspect, in a possible implementation manner, when the second access network device and the first access network device are the same access network device, the method further includes: receiving fifth information from the terminal device, where the fifth information is used to indicate sending the information replied by the core network device to the terminal device.

[0053] In a fourth aspect, the present application provides a communication method applied to a core network device, including: receiving a first request sent by the first access network device, where the first request is used to indicate that a terminal device requests to access the core network; sending first information to the second access network device, where the first information is the information replied by the core network device to the terminal device based on the first request; where the second access network device is determined based on any one of the following methods: indicated by the first access network device to the core network device, indicated by the terminal device to the core network device, and determined by the core network device based on ephemeris information.

[0054] In combination with the fourth aspect, in a possible implementation manner, the method further includes: instructing the second access network device to delete the stored first information after a third duration.

[0055] In combination with the fourth aspect, in a possible implementation, the second access network device and the first access network device are the same access network device, or the second access network device and the first access network device are different access network devices.

[0056] In combination with the fourth aspect, in a possible implementation, the method further includes: indicating the location of the terminal device to the second access network device. In this technical solution, by indicating the location of the terminal device to the second access network device, the core network device can enable the second access network device to send a broadcast message only when covering the terminal device, so that the terminal device can detect the second access network device.

[0057] In a fifth aspect, the present application provides a communication method applied to a terminal device, including: sending a first request to a first access network device, where the first request is used to indicate that the terminal device requests to access the core network; obtaining indication information for indicating that the terminal device accesses a second access network device from the first access network device or locally; the terminal device establishes a connection with the second access network device according to the indication information and sends an identifier of the terminal device to the second access network device; receiving first information from the second access network device, where the first information is information replied by the core network to the terminal device based on the first request, and the first information corresponds to the identifier of the terminal device.

[0058] In combination with the fifth aspect, in a possible implementation, the second access network device and the first access network device are the same access network device, or the second access network device and the first access network device are different access network devices.

[0059] In combination with the fifth aspect, in a possible implementation, the indication information is a first duration obtained from the first access network device, and the terminal device establishes a connection with the second access network device according to the indication information, including: establishing a connection with the second access network device after the first duration.

[0060] In combination with the fifth aspect, in a possible implementation, the first duration is determined by the first access network device based on ephemeris information.

[0061] In combination with the fifth aspect, in a possible implementation, the indication information is a first identifier sent by the first access network device, and the first identifier is used to identify the second access network device storing the first information replied by the core network device.

[0062] In combination with the fifth aspect, in a possible implementation, the indication information is a first identifier determined by the terminal device locally according to ephemeris information, and the first identifier is used to identify the second access network device storing the first information replied by the core network device.

[0063] Sixth aspect, the present application provides a communication method, which is applied to a second access network device and includes: receiving first information from a core network device, where the first information is information replied by the core network to a terminal device based on a first request, the first request is used to instruct the terminal device to request access to the core network, and the first information corresponds to a first terminal device identifier; receiving the first terminal device identifier, and sending the first information to the terminal device that sends the first terminal device identifier.

[0064] In combination with the sixth aspect, in a possible implementation manner, the first terminal device identifier is sent by the core network device to the second access network device.

[0065] Wherein, the first terminal device identifier is used to identify the terminal device that sends the first request in the initial access process. Exemplarily, the first terminal device identifier may be an international mobile subscriber identification (IMSI), a subscription permanent identifier (SUPI), a subscription concealed identifier (SUCI), a globally unique temporary identification (GUTI), a temporary mobile subscriber identity (TMSI), a cell radio network temporary identifier (C-RNTI), an inactive radio network temporary identifier (I-RNTI), etc.

[0066] Seventh aspect, the present application provides a communication device, which can implement the methods described in the first aspect to the sixth aspect and any possible implementation manner of the first aspect to the sixth aspect. The device includes corresponding modules for executing the above methods. The modules included in the device can be implemented in software and / or hardware manners.

[0067] Eighth aspect, the present application provides a communication device, which includes a processor, and the processor can be used to execute a computer program in a memory to implement the methods described in the first aspect to the sixth aspect and any possible implementation manner of the first aspect to the sixth aspect.

[0068] Optionally, the device further includes a communication interface, and the processor is coupled to the communication interface. The communication interface is configured to receive signals from other communication devices outside the device and transmit them to the processor, or send signals from the processor to other communication devices outside the device. Exemplarily, the communication interface can be a transceiver, a circuit, a bus, a module, a pin, or other types of communication interfaces.

[0069] Optionally, the device further includes a memory, and the processor is coupled to the memory. The memory is used to store program instructions and data. When the processor executes the instructions stored in the memory, the methods described in the above aspects can be implemented.

[0070] In a ninth aspect, the present application provides a communication device, including a processor and a communication interface. The communication interface is configured to receive signals from other communication devices outside the communication device and transmit them to the processor, or send signals from the processor to other communication devices outside the communication device. The processor uses logic circuits or executes code instructions to implement the methods described in the first aspect to the fifth aspect and any possible implementation manners of the first aspect to the fifth aspect. Exemplarily, the communication interface can be a transceiver, a circuit, a bus, a module, a pin, or other types of communication interfaces.

[0071] Optionally, the device further includes a memory for storing instructions and data. The memory can be coupled to the processor. When the processor executes the instructions stored in the memory, the methods described in the first aspect to the sixth aspect and any possible implementation manners of the first aspect to the sixth aspect can be implemented.

[0072] In a tenth aspect, the present application provides a communication device, including a processor and a memory. The memory is used to store instructions and data. When the processor executes the instructions stored in the memory, the methods described in the first aspect to the sixth aspect and any possible implementation manners of the first aspect to the sixth aspect can be implemented.

[0073] Optionally, the device further includes a communication interface for the device to communicate with other communication devices. Exemplarily, the communication interface can be a transceiver, a circuit, a bus, a module, a pin, or other types of communication interfaces.

[0074] In an eleventh aspect, the present application provides a computer-readable storage medium storing a computer program or instructions. When the computer program or instructions are executed, the methods described in the first aspect to the sixth aspect and any possible implementation manners of the first aspect to the sixth aspect can be implemented.

[0075] In a twelfth aspect, the present application provides a computer program product, which includes instructions that, when run, implement the methods described in the first aspect to the sixth aspect and any possible implementation manner of the first aspect to the sixth aspect.

[0076] In a thirteenth aspect, the present application provides a chip system, which includes at least one processor for supporting the implementation of the functions involved in the first aspect to the fifth aspect and any possible implementation manner of the first aspect to the sixth aspect. For example, receiving or processing the data involved in the above methods, etc.

[0077] In a possible design, the chip system further includes a memory for storing program instructions and data, and the memory is located inside or outside the processor.

[0078] The chip system may be composed of chips or may include chips and other discrete devices.

[0079] Among them, the effects achievable in the second aspect to the eleventh aspect can be referred to the description in the first aspect and will not be elaborated here. Description of the Drawings

[0080] Figure 1 Satellite network architecture for transparent payload provided by the present application;

[0081] Figure 2 Satellite network architecture for regenerative payload provided by the present application;

[0082] Figure 3 Schematic diagram of access connection and feeding connection when the satellite provided by the present application moves;

[0083] Figure 4 Schematic flowchart of the process for an existing terminal device to access the core network provided by the present application;

[0084] Figure 5 Schematic flowchart of the process for a terminal device in 4G provided by the present application to establish a connection with the core network;

[0085] Figure 6 Schematic flowchart of the process for a terminal device in 5G provided by the present application to establish a connection with the core network;

[0086] Figure 7 Schematic flowchart of a communication method provided by an embodiment of the present application;

[0087] Figure 8 Exemplary flowchart of a communication method provided by an embodiment of the present application;

[0088] Figure 9It is a schematic flowchart of a communication method provided by an embodiment of the present application;

[0089] Figure 10 It is an exemplary flowchart of a communication method provided by an embodiment of the present application;

[0090] Figure 11 It is a schematic flowchart of a communication method provided by an embodiment of the present application;

[0091] Figure 12 It is an exemplary flowchart of a communication method provided by an embodiment of the present application;

[0092] Figure 13 It is a schematic flowchart of a communication method provided by an embodiment of the present application;

[0093] Figure 14 It is an exemplary flowchart of a communication method provided by an embodiment of the present application;

[0094] Figure 15 It is a schematic flowchart of a communication method provided by an embodiment of the present application;

[0095] Figure 16 It is a structural schematic diagram of a communication device provided by an embodiment of the present application;

[0096] Figure 17 It is a structural schematic diagram of a communication device provided by an embodiment of the present application. Detailed implementation

[0097] Next, the technical solutions in the present application will be described in conjunction with the accompanying drawings.

[0098] Before introducing the method provided by the embodiment of the present application, the following points are explained first.

[0099] First, in the present application, indication includes explicit indication (also called direct indication) and implicit indication (also called indirect indication). Among them, explicitly indicating information A means including this information A; implicitly indicating information A means indicating information A through the correspondence between information A and information B and directly indicating information B. The correspondence between information A and information B can be predefined, pre-stored, pre-burned, or pre-configured; or, it can also mean indicating information A through information B and a preset rule.

[0100] Second, in the present application, information C is used for the determination of information D, which includes both the case where information D is determined only based on information C and the case where it is determined based on information C and other information. In addition, for the case where information C is used for the determination of information D, there can also be an indirect determination situation. For example, information D is determined based on information E, and information E is determined based on information C.

[0101] Third, in this application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the relationship between associated objects and indicates that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or B exists alone, where A and B can be singular or plural. The character " / " generally indicates an "or" relationship between the associated objects before and after, but does not exclude the case where it represents an "and" relationship between the associated objects before and after. The specific meaning represented can be understood in combination with the context. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can mean: a, b, c; a and b; a and c; b and c; or a, b, and c. Where a, b, and c can be single or multiple.

[0102] Fourth, in this application, the use of prefix words such as "first" and "second" is only for the convenience of distinguishing and describing different things belonging to the same name category, and does not restrict the order, size, or quantity of things. For example, "the first message" and "the second message" can be different messages or the same message, and this application does not make any restrictions on this.

[0103] Fifth, in this application, "send" and "receive" represent the direction of signal transmission. "Send" can also be understood as the "output" of the chip interface, and "receive" can also be understood as the "input" of the chip interface.

[0104] In other words, sending and receiving can be carried out between devices. For example, between a terminal device and a first access network device; or can be carried out within a device. For example, sending or receiving between components within a device, between modules, between chips, between software modules, or between hardware modules through a bus, trace, or interface.

[0105] Sixth, in this application, "when", "if", and "in case" all mean that the device will perform corresponding processing under certain objective circumstances, which does not limit time, and does not require the device to have a judgment action when implemented, nor does it mean that there are other limitations.

[0106] Seventh, in this application, words such as "example", "exemplarily", "for example", or "such as" are used to give examples, illustrations, or explanations. Any embodiment or design solution described in this application as "example", "exemplarily", "for example", or "such as" should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "example", "exemplarily", "for example", or "such as" is intended to present relevant concepts in a specific manner.

[0107] With the development of communication technologies, non-terrestrial networks (NTNs) have become a research hotspot. Exemplarily, Figures 1 to 2 are schematic diagrams of two network architectures of the NTN provided in the embodiments of this application. Among them, Figure 1 is a schematic diagram of a satellite network architecture with transparent payloads, Figure 2 is a schematic diagram of a satellite network architecture with regenerative payloads.

[0108] As Figure 1 shown, in the satellite network architecture with transparent payloads, it includes a ground mobile terminal (hereinafter simply referred to as the terminal device), a satellite, a ground station deployed on the ground, a base station deployed on the ground, and a core network. The terminal device accesses the core network through the satellite, the ground station, and the base station deployed on the ground.

[0109] As Figure 2 shown, in the satellite network architecture with regenerative payloads, it includes a terminal device, a satellite, a base station deployed on the satellite, a ground station, and a core network. The terminal device accesses the core network through the base station deployed on the satellite and the ground station deployed on the ground. Among them, the ground station can also be referred to as a gateway station. That is to say, in the satellite network architecture with regenerative payloads, the satellite has all or part of the functions of the base station.

[0110] Generally, in the satellite network architecture with regenerative payloads, the connection between the terminal device and the base station is also called an access connection, and the connection between the base station and the ground station is also called a feeder connection.

[0111] It should be noted here that this application does not limit the specific forms of the terminal device and the base station.

[0112] In the embodiments of this application, the terminal device can also be called a user equipment (UE), an access terminal, a user unit, a user station, a mobile station, a mobile platform, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device.

[0113] The terminal device can be a device that provides voice / data. For example, it can be a handheld device with wireless connection function, a vehicle-mounted device, etc. Currently, some examples of terminals are: mobile phone, tablet computer, laptop computer, palmtop computer, mobile internet device (MID), wearable device, virtual reality (VR) device, augmented reality (AR) device, wireless terminal in industrial control, wireless terminal in self-driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing devices connected to a wireless modem, wearable device, terminal device in a 5G network or terminal device in a future evolved public land mobile network (PLMN), etc. The embodiments of the present application are not limited thereto.

[0114] By way of example and not limitation, in the embodiments of the present application, the terminal device can also be a wearable device. A wearable device can also be called a wearable intelligent device, which is a general term for devices developed by applying wearable technology to the intelligent design of daily wear, such as glasses, gloves, watches, clothing, shoes, etc. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. A wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. Broadly speaking, wearable intelligent devices include those with complete functions and large sizes that can realize complete or partial functions without relying on a smart phone, such as smart watches or smart glasses, etc., and those that only focus on a certain type of application function and need to cooperate with other devices such as smart phones, such as various smart bracelets and smart jewelry for physical sign monitoring.

[0115] In the embodiments of the present application, the device for implementing the functions of the terminal device may be the terminal device or a device capable of supporting the terminal device to implement such functions, such as a chip system. This device may be installed in the terminal device or used in cooperation with the terminal device. In the embodiments of the present application, the chip system may be composed of chips or may include chips and other discrete devices. In the embodiments of the present application, only the case where the device for implementing the functions of the terminal device is the terminal device is taken as an example for illustration, which does not limit the solutions of the embodiments of the present application.

[0116] The base station in the embodiments of this application can be a device used to communicate with terminal devices, and this base station can also be referred to as an access network device or a radio access network device. The base station in the embodiments of this application can refer to a radio access network (RAN) node (or device) that connects terminal devices to a wireless network. The base station can generally cover various names as follows, or be replaced with the following names, such as: Node B, evolved Node B (eNB), next generation Node B (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station, slave station, multi standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), radio unit (RU), positioning node, etc. The base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station can also refer to a communication module, a modem or a chip used in the aforementioned device or apparatus. The base station can also be a mobile switching center and a device that undertakes the function of the base station in D2D, V2X, M2M communications, a network side device in a 6G network, a device that undertakes the function of the base station in a future communication system, etc. The base station can support networks with the same or different access technologies. Optionally, the RAN node can also be a server, a wearable device, a vehicle or an in-vehicle device, etc. For example, the access network device in vehicle to everything (V2X) technology can be a road side unit (RSU). The embodiments of this application do not limit the specific technologies and specific device forms adopted by the network device.In some deployments, the network device mentioned in the embodiments of the present application may be a device including a CU, or a DU, or a device including a CU and a DU, or a control plane CU node (Central Unit-Control Plane (CU-CP)) and a user plane CU node (Central Unit-User Plane (CU-UP)) and a DU node. For example, the network device may include a gNB-CU-CP, a gNB-CU-UP, and a gNB-DU.

[0117] In some deployments, multiple RAN nodes cooperate to assist a terminal in achieving wireless access, and different RAN nodes respectively implement some functions of a base station. For example, the RAN node may be a CU, a DU, a CU-CP, a CU-UP, or an RU, etc. The CU and the DU may be separately provided, or may also be included in the same network element, such as a BBU. The RU may be included in a radio frequency device or a radio frequency unit, such as included in an RRU, an AAU, or an RRH.

[0118] The RAN node may support one or more types of fronthaul interfaces. Different fronthaul interfaces respectively correspond to DUs and RUs with different functions. If the fronthaul interface between the DU and the RU is a Common Public Radio Interface (CPRI), the DU is configured to implement one or more of the baseband functions, and the RU is configured to implement one or more of the radio frequency functions. If the fronthaul interface between the DU and the RU is another interface, compared with the CPRI, some of the downlink and / or uplink baseband functions, for example, for the downlink, one or more of precoding, digital beamforming (BF), or inverse fast Fourier transform (IFFT) / adding cyclic prefix (CP), are moved from the DU to the RU for implementation. For the uplink, one or more of digital beamforming (BF), or fast Fourier transform (FFT) / removing cyclic prefix (CP) are moved from the DU to the RU for implementation. In a possible implementation manner, this interface may be an Enhanced Common Public Radio Interface (eCPRI). In the eCPRI architecture, the splitting method between the DU and the RU is different, corresponding to different categories (Cat) of eCPRI, such as eCPRI Cat A, B, C, D, E, F.

[0119] In a possible design, the processing unit in the BBU for implementing baseband functions is called the baseband high (BBH) unit, and the processing unit in the RRU / AAU / RRH for implementing baseband functions is called the baseband low (BBL) unit.

[0120] In different systems, the CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, the CU may also be called the O-CU (Open CU), the DU may also be called the O-DU, the CU-CP may also be called the O-CU-CP, the CU-UP may also be called the O-CU-UP, and the RU may also be called the O-RU. Any one of the CU (or CU-CP, CU-UP), DU, and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0121] In the embodiments of the present application, the core network side may include a user plane function (UPF) of the data plane and the core network control plane. The UPF is a functional unit of the user plane, mainly responsible for forwarding packet data, quality of service (QoS) control, charging information statistics, connecting to external networks, etc. It includes the relevant functions of the serving gateway (SGW) and the public data network gateway (PDN-GW) of the long term evolution (LTE) technology. The core network control plane is mainly responsible for service process interaction, sending packet forwarding policies and QoS control policies to the user plane, etc. Exemplarily, the control plane network elements in the core network control plane mainly include: access and mobility function (AMF), session management function (SMF), policy control function (PCF), application function (AF), network exposure function (NEF), etc. Among them, the functions of each network element can refer to the descriptions in the related technologies and will not be elaborated here. In addition, it should be noted that each network element involved in the embodiments of the present application can be either the network element mentioned in the above embodiments or a network element with the same function as each of the above network elements. For example, the application function network element can be an AF network element or a network element with the same function as the AF network element; the policy management network element can be a PCF network element or a network element with the same function as the PCF network element.

[0122] In the embodiments of the present application, the device for implementing the functions of the base station can be a base station; it can also be a device capable of supporting the base station to implement such functions, such as a chip system, a hardware circuit, a software module, or a combination of a hardware circuit and a software module. The device can be installed in the base station or used in combination with the base station. In the embodiments of the present application, only the base station is taken as an example for illustration, which does not limit the solutions of the embodiments of the present application.

[0123] It can be understood that in the satellite network architecture with regenerative payloads, the satellites are mobile. Therefore, there will be a situation where the access connection between the terminal device and the base station deployed on the satellite is disconnected, which is also called the access connection unavailable, or there will be a situation where the feeder connection between the base station deployed on the satellite and the ground station is disconnected, which is also called the feeder connection unavailable.

[0124] In the embodiments of the present application, the inaccessibility of the access connection can also be understood as that the terminal device is not within the coverage of the base station deployed on the satellite, the base station cannot receive the signal sent by the terminal device to the base station deployed on the satellite, or the terminal device cannot receive the signal sent by the base station deployed on the satellite. Conversely, the accessibility of the access connection can be understood as that the terminal device is within the coverage of the base station deployed on the satellite, the base station deployed on the satellite can receive the signal sent by the terminal device, or the terminal device can receive the signal sent by the base station deployed on the satellite.

[0125] In the embodiments of the present application, the inaccessibility of the power feeding connection can be understood as that the ground station cannot receive the signal sent by the base station deployed on the satellite to the ground station, or the satellite cannot receive the signal sent by the ground station to the base station deployed on the satellite, or information (including control plane signaling and user plane data packets) cannot be sent between the base station and the core network device. Conversely, the accessibility of the power feeding connection can be understood as that the ground station can receive the signal sent by the base station deployed on the satellite, or the base station deployed on the satellite can receive the signal sent by the ground station, or information (including control plane signaling and user plane data packets) can be sent between the base station and the core network device to each other.

[0126] Exemplarily, as Figure 3 shown, when the satellite with the base station deployed is at position 1, the access connection between the terminal device and the base station is available. When the satellite moves to position 2, both the access connection between the terminal device and the base station and the power feeding connection between the base station and the ground station are unavailable. When the satellite moves to position 3, the power feeding connection between the base station and the ground station is available.

[0127] For ease of description, the base stations deployed on the satellite are all simply referred to as base stations, that is, the base stations in the following text specifically refer to the base stations deployed on the satellite.

[0128] That is to say, in the satellite network architecture of the regenerative payload, the power feeding connection between the base station and the ground station does not always exist, or it can be said that the power feeding connection between the base station and the ground station is not always available, or the connection between the terminal device and the base station does not always exist, or it can be said that the access connection between the terminal device and the base station is not always available.

[0129] Furthermore, it is possible that the access connection and the power feeding connection cannot be available simultaneously. At this time, the following problem will occur: In the process of the terminal device initially accessing the core network, after the terminal device sends an initial access request for requesting access to the core network, the terminal device disconnects from the current base station before receiving the reply message from the core network, that is, the terminal device disconnects from the current base station before completing the process of accessing the core network. In the embodiments of the present application, the request for requesting access to the core network is also referred to as an initial access request or an initial network access request, which does not constitute a limitation of the present application.

[0130] For example, when the terminal sends an initial access request to the base station and the feeder connection between the base station and the ground station is unavailable, the base station needs to send the initial access request to the core network when the feeder connection is available so that the core network device can determine the information to reply to the terminal device based on the first information. However, when the feeder connection is available, the access connection between the terminal device and the current base station may be unavailable.

[0131] Then, in this scenario, how to ensure that the terminal can receive the final information replied by the core network device to the terminal to complete the network access of the terminal device becomes a technical problem to be solved urgently.

[0132] Next, in conjunction with the accompanying drawings, the communication method provided by this application will be introduced to enable the terminal device to receive the reply message sent by the core network device to the terminal in the scenario where the terminal device is disconnected from the current base station before accessing the core network, so as to complete the network access of the terminal device.

[0133] Before describing in detail the communication method provided by this application, first, in conjunction with Figures 4 to 6 the process when the terminal device accesses the core network will be explained in detail. The process of the terminal device accessing the core network is also called the network access process of the terminal device.

[0134] Figure 4 FIG. is a schematic diagram of the existing process for a terminal device to access the core network provided by an embodiment of this application. Figure 4 The method shown includes steps 410 to 440. Next, each step in Figure 4 will be described in detail.

[0135] Step 410: When the terminal device accesses the network, it first performs cell search and selection.

[0136] Among them, cell search is for the terminal device to detect the broadcast messages of the base station, including the physical cell identifier (PCI), the master information block (MIB), and the system information block / system information broadcast. The PCI is used to determine the cell, and the combination of the PCI, MIB, and system information block / system information broadcast is the information necessary for the terminal device to camp on the cell and initiate initial access.

[0137] After the cell search is completed, the terminal device selects a cell from the PLMN, and the terminal device achieves downlink synchronization with the cell.

[0138] Step 420: The terminal device performs random access.

[0139] Random access is used to achieve uplink synchronization with the cell.

[0140] For example, in this process, the base station allocates uplink resources for the terminal device to send an RRC setup request (RRC SetupRequest), and the terminal device can initiate uplink transmission only after obtaining the uplink resources.

[0141] Step 430: After the terminal device successfully performs random access, the terminal device establishes an RRC connection with the base station.

[0142] For example, the terminal device sends an RRC Setup Request to the base station on signaling radio bearer (SRB) 0 (SRB0); after receiving the RRC Setup Request, the base station sends an RRC setup (RRC Setup) to the terminal device, and the RRC Setup carries detailed information about the SRB1 resource configuration; after receiving the RRC Setup, the terminal device sends an RRC setup complete (RRC SetupComplete) to the base station to indicate that the terminal device has successfully established an RRC connection with the base station.

[0143] Among them, SRB0 does not need to be established and always exists. SRB0 is used to carry RRC signaling before the successful establishment of the RRC connection and is transmitted through the CCCH logical channel.

[0144] Among them, SRB1 is used to carry RRC signaling after the successful establishment of the RRC connection and NAS signaling before the establishment of SRB2, and is transmitted through the DCCH logical channel. SRB2 is used to carry NAS signaling and is transmitted through the DCCH logical channel. The priority of SRB2 is lower than that of SRB1, and SRB2 can be established only after the security mode is activated. SRB2 is established through RRC reconfiguration. NAS signaling is the signaling for transmitting information between the terminal device and the core network element, and the base station is only responsible for forwarding. This signaling is above the RRC layer, that is, NAS signaling can occur only after the RRC connection is successfully established.

[0145] That is, the purpose of establishing an RRC connection is to establish SRB1, and then transmit RRC signaling after the successful establishment of the RRC connection through SRB1.

[0146] After the RRC connection is successfully established, an RRC context will be saved on both the terminal device and the base station, including the identifier of the terminal device, such as the cell radio network temporary identifier (C-RNTI), resource information of the SRB, etc.

[0147] Among them, steps 410 to 430 can also be referred to as the process of the terminal device accessing the base station. That is, the process of the terminal device accessing the base station includes: cell selection, random access, and establishment of RRC connection.

[0148] Step 440: The terminal device establishes a connection with the core network to complete access to the core network.

[0149] Exemplarily, in 4G, the process of the terminal device establishing a connection with the core network is as Figure 5 shown. In 4G, the process of the terminal device establishing a connection with the core network is also called the Attach process.

[0150] As Figure 5 shown, the process of the terminal device establishing a connection with the core network in 4G includes steps 510 to 570.

[0151] Step 510: The terminal device sends an Attach Request message to the base station to request access to the core network.

[0152] Optionally, the Attach request message may include: SUCISUCI, globally unique temporary identification (GUTI), Attach Type, and ESM message container.

[0153] Step 520: The base station forwards the Attach request message to the MME.

[0154] Optionally, when forwarding the Attach request to the MME, it also indicates the selected public land mobile network (PLMN), tracking area identity (TAI), and cell global identifier (ECGI) to the MME.

[0155] Step 530: The MME instructs the terminal device to provide the IMSI; correspondingly, the terminal device provides the IMSI.

[0156] If the MME recognizes the GUTI provided by the terminal device, this step may not be required. That is, this step is optional.

[0157] Step 540: An authentication and authorization process is performed among the terminal device, the base station, the MME, and other core network elements.

[0158] Step 550: The MME and other core network elements interact to complete processes such as session establishment.

[0159] Step 560: The MME sends the Attach accept information to the base station via a Downlink NAS transport message.

[0160] The Attach accept information is used to indicate that the core network side accepts the access request of the terminal device, or it can also be said that the core network side allows the terminal device to access the network.

[0161] Optionally, the Downlink NAS transport message further includes the GUTI of the terminal device, TAI list information, and Session Management Request information.

[0162] Step 570: The base station forwards the Attach accept information to the terminal device.

[0163] The detailed content of steps 540 to 570 can be referred to the description in the related art and will not be elaborated here.

[0164] It can be understood that after the terminal device receives the Attach accept information sent by the MME, it replies to the MME with an Initial Access Completion message via the base station. After the MME receives this message and performs actions such as configuring the bearer, the initial access process is completed.

[0165] Exemplarily, Figure 6 This is a process for an existing key device in 5G provided by this application to establish a connection with the core network. In 5G, the process for the terminal device to establish a connection with the core network is also called the Registration process.

[0166] As Figure 6 shown, the process for the terminal device in 5G to establish a connection with the core network includes steps 610 to 670.

[0167] Step 610: The terminal device sends a Registration Request to the base station to request access to the core network.

[0168] Optionally, the Registration Request may include: 5G-S-TMSI, the identifier of the selected PLMN, and network slice selection assistance information (NSSAI).

[0169] Step 620: The base station forwards the Registration Request to the MME.

[0170] Optionally, when forwarding the Attach request to the MME, the identity of the selected PLMN, the location information of the terminal device, and the cell identification are also indicated to the MME.

[0171] Step 630: The AMF instructs the terminal device to provide a GUTI; correspondingly, the terminal device provides a SUCI.

[0172] If the MME recognizes the GUTI provided by the terminal device, this step may not be required. That is, this step is optional.

[0173] Step 640: An authentication and authorization process is performed among the terminal device, the base station, the AMF, and other core network elements.

[0174] Step 650: The AMF and other core network elements interact to complete processes such as subscription and policy information of the terminal device.

[0175] Step 660: The AMF sends a Registration accept message to the base station.

[0176] Among them, the Registration accept message is used to indicate that the core network side accepts the access request of the terminal device, or it can also be said that the core network side allows the terminal device to access the network.

[0177] Optionally, when sending the Registration accept message, the 5G-GUTI, the registration area, and the allowed NSSAI of the terminal device can also be indicated to the base station.

[0178] Step 670: The base station forwards the Registration accept message to the terminal device.

[0179] Among them, the detailed content of steps 640 to 670 can be referred to the description in related technologies and will not be elaborated here.

[0180] It can be understood that after the terminal device receives the Registration accept message sent by the AMF, it replies with an Initial Access Completion message to the AMF through the base station. After the AMF receives this message and performs actions such as configuring bearers, the initial access process is completed.

[0181] Next, the communication method provided by this application will be introduced in detail. This communication method can also be called the access method of the terminal device.

[0182] Figure 7 It is a schematic flowchart of the communication method provided by the embodiments of this application. Figure 7 This method is only described from the perspective of the interaction among the terminal device, the first access network device, the second access network device, and the core network device, and should not constitute any limitation to this application.

[0183] For example, Figure 7 the terminal device in Figure 7 can be replaced with components configured in the terminal device (such as chips, chip systems, processors, etc.), or logical modules or software that can implement all or part of the functions of the terminal device; the first access network device can be replaced with components configured in the first access network device (such as chips, chip systems, processors, etc.), or logical modules or software that can implement all or part of the functions of the first access network device; the second access network device can be replaced with components configured in the second access network device (such as chips, chip systems, processors, etc.), or logical modules or software that can implement all or part of the functions of the second access network device; the core network device can be replaced with components configured in the core network device (such as chips, chip systems, processors, etc.), or logical modules or software that can implement all or part of the functions of the core network device.

[0184] Figure 7 The method shown in Figure 7 includes steps 701 to 705. The steps of the method will be described in detail below. Figure 7 for each step of the method shown in Figure 7 .

[0185] Step 701: The terminal device sends a first request to the first access network device, and the first request is used to indicate that the terminal device requests to access the core network; the first access network device receives the first request.

[0186] In this embodiment, the first request is used to indicate that the terminal device accesses the core network. The first request may also be referred to as an initial access request or an initial network access request.

[0187] Specifically, in this embodiment, the terminal device sends the first request to the first access network device when the access connection between the terminal device and the first access network device is available.

[0188] Exemplarily, the first request may be an Attach Request in a 4G communication system.

[0189] Exemplarily, the first request may be a Registration Rquest in a 5G communication system.

[0190] It can be understood that only Attach Request and Registration Rquest are used as examples here, and it should not constitute a limitation to this application. For example, it may also be a certain request sent by a terminal device in a future communication system, as long as the certain request is used for the terminal device to request access to the core network, then the certain request can also be considered as the first request here.

[0191] In addition, it can be understood that in this embodiment, before the terminal device sends the first request, the terminal device needs to first establish a connection with the first access network device, that is, access the first access network device. Among them, the content related to how to establish a connection with the access network device can refer to 3GPP TS 38.331, 36.331 or Figure 4 the description of the content, which will not be elaborated here.

[0192] Step 702: The first access network device sends the first request of the terminal device to the core network device; the core network device receives the first request.

[0193] That is, after the first access network device receives the first request sent by the terminal device, it will forward the first request to the core network device, or in other words, the terminal device sends the first request to the core network device through the first access network device.

[0194] In this embodiment, when the power feeding connection between the first access network device and the ground station is available, the first request of the terminal device is forwarded to the core network device.

[0195] In one implementation manner, after the first access network device receives the first request sent by the terminal device, when the power feeding connection is available, the first request of the terminal device is sent to the core network device, so that the core network device can determine the terminal device that requests to access the core network.

[0196] Exemplarily, when the communication method provided in this application is applied to a 4G communication system, the core network device here can be an MME.

[0197] Exemplarily, when the communication method provided in this application is applied to a 5G communication system, the core network device here can be an AMF.

[0198] It can be understood that AMF and AMF here are only examples and should not constitute a limitation to this application.

[0199] Step 703: The core network device sends the first information to the second access network device, where the first information is the information replied by the core network device to the terminal device based on the first request; the second access network device receives the first information.

[0200] In this embodiment, after the core network device receives the first request of the terminal device, it will determine the information to be replied to the terminal device to help the terminal device complete the process of accessing the core network. In this application, the information replied by the core network device to the terminal device is called the first information.

[0201] Exemplarily, the first information may be any one of the following: information for indicating acceptance of access by a terminal device to the core network (such as attach accept, registration accept, etc.), an authentication request (authentication request), an N1 message, etc., a non-access stratum message (NAS message).

[0202] In this embodiment, when the feeder connection between the second access network device and the ground station is available, the core network device will indicate to the second access network device the first information to be replied to the terminal device, so as to forward, via the second access network device, the information replied by the core network device to the terminal device to the terminal device. Or in other words, the core network device will reply the first information to the terminal device via the second access network device. Or in other words again, the second access network device forwards the first information replied by the core network device to the terminal device. Or in other words again, the second access network is the access network device that stores the first information replied by the core network device to the terminal device.

[0203] Step 704: The terminal device establishes a connection with the second access network device.

[0204] It can be understood that when the second access network device is to reply the first information to the terminal device, it is first necessary to ensure that a connection is established between the second access network device and the terminal device. Specifically, the establishment of the connection herein refers to the access of the terminal device to the second access network device, for example, including processes such as cell selection by the terminal device, random access, and RRC connection establishment. In this way, the second access network device can forward the first information replied by the core network device to the terminal device to the terminal device.

[0205] Therefore, in this embodiment, the terminal device establishes a connection with the second access network device that stores the first information, and sends the identifier of the terminal device to the second access network device. In this way, after the connection is established, for the second access network device, the first information replied by the core network device to the terminal device can be determined based on the identifier of the terminal device, and then the first information is forwarded to the terminal device.

[0206] Among them, the identifier of the terminal device described in the embodiments of the present application is used to identify the terminal device that sends the first request in the initial access process. Exemplarily, the identifier of the terminal device may be an international mobile subscriber identification (IMSI), a subscription permanent identifier (SUPI), a subscription concealed identifier (SUCI), a globally unique temporary identification (GUTI), a temporary mobile subscriber identity (TMSI), a cell radio network temporary identifier (C-RNTI), an inactive radio network temporary identifier (I-RNTI), etc.

[0207] It should be noted here that this embodiment does not limit how to determine the identifier of the terminal device sent to the second access network device by the terminal device.

[0208] In the first implementation manner, the terminal device pre-configures or locally determines the identifier of the terminal device, and the terminal device sends the identifier of the terminal device to the second access network device. For example, the terminal device pre-configures the IMSI or SUPI, or locally determines the SUCI as the identifier of the terminal device, and then sends the identifier of the terminal device to the first access network device in step 701, and sends the identifier of the terminal device to the second access network device in step 704. Optionally, in the first implementation manner, the first access network device may send the identifier of the terminal device to the core network in step 702.

[0209] In the second implementation manner, the identifier of the terminal device sent by the terminal device may be assigned by the first access network device.

[0210] Optionally, in an implementation scenario a) of the second implementation manner, after receiving the first request in step 701, the first access network device assigns an identifier of the terminal device to the terminal device and sends the identifier of the terminal device to the terminal device. For example, C-RNTI, I-RNTI, a combination of C-RNTI and RAN identifier, a combination of I-RNTI and RAN identifier, TMSI, GUTI, a dedicated identifier (which can be considered as a newly added identifier specifically for identifying the terminal device in the initial access process), etc. Correspondingly, the terminal device sends the identifier of the terminal device to the second access network device in step 704.

[0211] Optionally, in an implementation scenario b) of the second implementation manner, when the terminal device accesses the first access network device (for example, when establishing an RRC connection), the first access network device assigns an identifier of the terminal device to the terminal and sends it to the terminal device. For example, C-RNTI, I-RNTI, a combination of C-RNTI and RAN identifier, a combination of I-RNTI and RAN identifier. Correspondingly, the terminal device sends the identifier of the terminal device to the second access network device in step 704.

[0212] Among them, for the second access network device, there are several methods to determine the first information replied by the core network device based on the identifier of the terminal device as follows:

[0213] In the first implementation manner, the second access network device determines the first information replied by the core network device based on the identifier of the terminal device sent by the terminal device and the corresponding relationship between the identifier of the terminal device stored locally and the second identifier. Wherein, the second identifier is the identifier used to identify the terminal device determined by the first access network device and the core network device when the first access network device forwards the first request to the core network device, that is, the second identifier is the identifier for identifying the terminal device between the first access network device and the core network device. Specifically, when the core network device sends the first information to the second access network device, it sends the first information and the second identifier to the second access network device together. In this way, the second access network device determines the identifier of the terminal device corresponding to the first information according to the corresponding relationship between the second identifier and the identifier of the terminal device. Further, when the terminal device sends the identifier of the terminal device, the second access network device sends the first information to the terminal device.

[0214] In the second implementation manner, the core network device sends the first information and the identifier of the terminal device corresponding to the first information to the second access network device, and the second access network device stores this corresponding relationship. In this way, when the terminal device sends the identifier of the terminal device to the second access network device, it can determine the first information corresponding to the identifier of the terminal device.

[0215] In addition, it should be noted that in this embodiment, the terminal device only establishes a connection with the second access network device, and will not send a first request as in step 701 to the second access network device again.

[0216] It should be noted here that this embodiment does not limit the manner in which the access network device for enabling the terminal device to establish a connection and the access network device for determining and storing the first information replied by the core network device to the terminal device are both the second access network device.

[0217] In the first implementation manner, the terminal device and the core network device can agree in advance through a protocol that after the core network device receives the first request, it sends the first information to the first access network device that forwards the first request; correspondingly, the terminal device re - establishes a connection with the first access network device that receives the first request and sends the identifier of the terminal device. For example, if the terminal device determines that the broadcast comes from the first access network device based on the identifier of the first access network device in the received broadcast message, it establishes a connection with the first access network device, where the identifier of the first access network device can be locally configured by the terminal device or received from the first access network device previously. Or, the terminal device establishes a connection with the access network device that sends the broadcast message received by the terminal device after the expiration of a locally configured timer. Based on the timer, it can be ensured that this access network device is the first access network device. Specifically, this timer can be determined by the terminal device according to the ephemeris information.

[0218] It can be understood that since the core network device stores the first information for replying to the terminal device in the first access network device, and the terminal device establishes a connection with the first access network device and sends the identifier of the terminal device to the first access network device. In this way, for the second access network device, after establishing a connection with the terminal device, it can determine the first information corresponding to the terminal device stored based on the identifier of the terminal device, and thus send the first information to the terminal device to help the terminal device complete the process of accessing the core network. In addition, it can be understood that in this first implementation manner, the second access network device is the first access network device, or in other words, the second access network device and the first access network device are the same access network device.

[0219] In the second implementation manner, the first access network device determines the second access network device, and the first access network device indicates to the terminal device the second access network device to establish a connection with, and indicates to the core network device the second access network device. For example, the first access network device determines the access network device that can cover the terminal device fastest and can obtain the first information from the core network device fastest based on the ephemeris information as the second access network device.

[0220] Among them, the ephemeris information is the motion law information of the satellite, such as including information such as the satellite's orbital parameters, angular velocity, speed, etc. Based on this information, the communication device can calculate the position of the satellite on the orbit at each moment. The ephemeris information can be expressed as a simple correspondence relationship, such as the satellite position information corresponding to each moment / time period. The ephemeris information can also be expressed as a satellite coverage map, such as the Satellite coverage availability information. The satellite coverage map can divide the Earth's surface into multiple grid points and show the grid points covered by the satellite and the grid points not covered at each moment. For example, the operating period of the satellite orbiting the Earth is one hour with a precision of minutes. Each minute, the satellite corresponds to a satellite coverage map. Some grid points in the map are bright and some are dark. The bright grid points indicate the grid points that will be covered by the satellite at the corresponding moment in each cycle of the satellite.

[0221] It should be noted here that the ephemeris information involved in this application includes but is not limited to traditional ephemeris information, satellite map information, and the deployment information of the gateway station. Among them, the traditional ephemeris information includes but is not limited to orbital parameters, or parameters such as the azimuth of the satellite calculated based on the orbital parameters. It can be understood that the traditional ephemeris information can be used to calculate, predict, depict, or track the time, position, speed, and other states of the satellite flight. Exemplarily, the traditional ephemeris information can be 17 bytes of information to represent the position (78 bits) and speed (54 bits), or the traditional ephemeris information can be 18 bytes of information to represent orbital parameters (such as semi-major axis, range, eccentricity, argument of perigee, etc.). The satellite map information can be the coverage range of the satellite on the map at each moment. In this application, the specific form, content, and name of the ephemeris information are not limited, and the definition of the ephemeris information in the existing protocol can be referred to. For example, the ephemeris information in this application can also be referred to as satellite coverage availability information.

[0222] It should be noted here that this embodiment does not limit the manner in which the first access network device indicates the second access network device for establishing a connection to the terminal device.

[0223] For example, in one indication method, the first access network device determines a first duration. The value of the first duration satisfies the following conditions: the second access network device can cover the terminal device after the first duration, and the first information has been obtained from the core network device. Then, the first access network device sends second information to the terminal device to indicate the first duration, and the first access network device sends the identifier of the second access network device to the core network device so that the core network device sends the first information to the second access network device, thereby helping the terminal device complete the process of accessing the core network.

[0224] For example, the first access network device can determine the first duration based on at least one of the ephemeris information and the following information: the location of the satellite where the first access network device is deployed, the location of the terminal device, and the current time. It can be understood that the first duration can be regarded as the timing for triggering the terminal device to establish a connection with the second access network device. Therefore, the first duration is also referred to as the access timer of the terminal device. In this embodiment, the specific content of the second information for specifically indicating the first duration is not limited. For example, the content of the second information is the determined first duration; for another example, the content of the second information is a timer, and the first duration is indicated through this timer; or, the content of the second information can be the time for the terminal device to establish a connection. Correspondingly, after receiving this time, the terminal device combines the current time to determine the first duration.

[0225] It can be understood that in this way, the broadcast message received by the terminal device after the first duration is the broadcast message of the second access network device. Further, the access network device to which the terminal device accesses and sends the identifier of the terminal device is the second access network device. The core network device has sent the first information to the second access network device. Therefore, after the terminal device establishes a connection with the second access network device, the second access network device determines the stored first information corresponding to the terminal device based on the identifier of the terminal device and sends the first information to the terminal device to complete the process of the terminal device accessing the core network.

[0226] Optionally, in this method of indicating the first duration, if the second access network device determined by the first access network device is the same as the first access network device, at this time, the first access network device can only indicate the first duration to the terminal device without indicating the second access network device to the core network device; correspondingly, the core network device forwards the first information through the first access network device. Optionally, when the first access network device and the second access network device are the same, since the terminal device will only establish a connection with the first access network device, the identifier of the terminal device can be RAN specific (that is, it does not need to be globally unique and only needs to be unique within each RAN).

[0227] For example, in another indication method, after the first access network device determines the second access network device, it sends the first identifier used to identify the second access network device to the terminal device to indicate that the terminal device accesses the second access network device, and sends the first identifier to the core network device to indicate that the core network device determines the second access network device that receives (or stores) the first information.

[0228] Exemplarily, the first identifier used to identify the second access network device may be: the physical cell identifier (PCI) of the cell included in the second access network device, the E-UTRAN cell global identifier (ECGI) / NR cell global identifier (NCGI) (including eNB / gNB ID) in the system information block (SIB1) message, and the global RAN node ID.

[0229] It can be understood that in this method, the terminal device determines that the broadcast message comes from the second access network device according to the first identifier in the received broadcast message, then establishes a connection with the second access network device and sends the identifier of the terminal device to the second access network device. Since the core network device has sent the first information for replying to the terminal device to the second access network device, after the second access network device establishes a connection with the terminal device, it determines the first information stored corresponding to the terminal device based on the identifier of the terminal device and sends the first information to the terminal device to complete the process of the terminal device accessing the core network.

[0230] Optionally, in this method of indicating the identifier of the second access network device, the terminal device may keep detecting, or be continuously detecting, until it detects the broadcast message including the first identifier. Alternatively, the terminal device may determine the time period when it will be covered by the second access network device next time (which can also be considered as the time period when the terminal device and the second access network device are available for the next access connection). For example, the terminal device determines the time period when it will be covered by the second access network device next time based on the ephemeris information, and then the terminal device only detects the broadcast message including the first identifier within this time period.

[0231] Optionally, in this method of indicating the identifier of the second access network device, if the second access network device determined by the first access network device is the same as the first access network device, at this time, the first access network device may also only send the first identifier to the terminal device and not send the first identifier to the core network device; correspondingly, the core network device sends the first information to the first access network device.

[0232] In the third implementation method, the terminal device only detects the broadcast message of the first access network device and only establishes a connection with the first access network device. The first access network device sends the identifier of the first access network device to the core network device, and the core network device determines the second access network device that receives (or stores) the first information. At this time, if the second access network device determined by the core network device is different from the first access network device, then the core network device sends the first information, the identifier of the terminal device, and the identifier of the first access network device to the second access network device. Correspondingly, the second access network device also carries the identifier of the first access network device in the broadcast message.

[0233] It can be understood that in this third implementation method, for the terminal device, when receiving the broadcast message including the identifier of the first access network device, one case is that the broadcast message including the identifier of the first access network device is from the first access network device, and the other case is from the second access network device. At this time, if it is from the second access network device, then after the terminal device establishes a connection with the second access network device and sends the identifier of the terminal device, the second access network device can determine the corresponding first information based on the identifier of the terminal device, and then send the first information to the terminal device to help the terminal device complete the process of accessing the core network.

[0234] It should be understood that in this third implementation method, the identifier of the terminal device must be globally unique because different access network devices need to send messages to the terminal device. If it is not globally unique, there may be duplicates in the identifiers of the terminal devices determined between different access network devices and different terminal devices.

[0235] Optionally, in this third implementation method, the second access network device can continuously broadcast the identifier of the first access network device. Or, the second access network device can only broadcast the identifier of the first access network device during the period when the terminal device is covered. For example, the first access network device sends the location information of the terminal device to the core network device, and then the core network device sends the location information of the terminal device to the second access network device. The second access network device determines the period when the terminal device is covered according to the ephemeris information and the location of the terminal device, and then carries the identifier of the first access network device in the broadcast message during this period. Or, directly by the core network device, based on the ephemeris information and the terminal device, determine the period when the second access network device covers the terminal device, and then send this period to the second access network device. Correspondingly, the second access network device carries the identifier of the first access network device in the broadcast message during this period.

[0236] In the fourth implementation method, without the indication of the first access network device, instead, the terminal device and the core network device agree to use the same algorithm to determine the same second access network device.

[0237] For example, both the terminal device and the core network device determine the second access network device based on the ephemeris information and at least one of the following information: the location of the terminal device, the current time. Exemplarily, both the terminal device and the core network device determine the access network device that can cover the terminal device fastest and can obtain the first information from the core network device fastest as the second access network device. In this way, after the terminal device establishes a connection with the second access network device and sends the identifier of the terminal device to the second access network device, the second access network device determines the first information stored corresponding to the terminal device based on the identifier of the terminal device, and sends the first information to the terminal device to complete the process of the terminal device accessing the core network.

[0238] It can be understood that in this way, the second access network device determined by the terminal device and the core network device may be the same access network device as the first access network device, or may not be the same access network device as the first access network device. In addition, it can be understood that there are also differences between the fourth implementation method and the first implementation method: the first implementation method can be considered as the method stipulated by the protocol, that is, neither the terminal device nor the core network device will perform any internal process of determining the second access network device, while in the fourth implementation method, both the terminal device and the core network device will determine the second access network device based on the same algorithm.

[0239] In the fifth implementation method, the terminal device determines the second access network device and sends the first identifier for identifying the second access network device to the core network device through the first access network device; correspondingly, after receiving the first identifier, the core network sends the first information to the second access network device.

[0240] For example, the terminal device determines the second access network device based on the ephemeris information and at least one of the following information: the location of the terminal device, the current time. Exemplarily, the terminal device determines the access network device that can cover the terminal device fastest and can obtain the first information from the core network device fastest as the second access network device, and then the terminal device sends the second access network device identifier to the core network device through the first access network device to indicate to the core network device the second access network device to which the terminal device will establish a connection. The core network device sends the first information in reply to the terminal device to the second access network device, so as to ensure that after the terminal device establishes a connection with the second access network device, it can obtain the first information replied by the core network device stored in the second access network device, and ensure that the terminal device completes the process of accessing the core network.

[0241] It can be understood that in this way, the second access network device determined by the terminal device may or may not be the same as the first access network device. When the first access network device and the second access network device are not the same, it is necessary to indicate the determined access network device to the core network device so that the access network device to which the terminal device establishes a connection is the same as the access network device that receives the first information sent by the core network device. Optionally, when the first access network device and the second access network device are the same, the terminal device may also not indicate to the core network device through the first access network device the second access network device to which a connection will be established. For example, the core network device sends the first information to the first access network device without indication.

[0242] Optionally, in the fifth implementation, the terminal device may continuously detect, or the terminal device may determine the time period when it will be covered by the second access network device next time, and then the terminal device only detects the broadcast message including the first identifier during this time period. This part can refer to the description in the second implementation and will not be elaborated here.

[0243] In the sixth implementation, the core network device determines the second access network device. For example, the core network device determines, based on ephemeris information, the access network device that can cover the terminal device fastest and can obtain the first information from the core network device fastest as the second access network device, and then the core network device also does not indicate the second access network device to the terminal device; correspondingly, for the terminal device, when receiving any broadcast message, it establishes a connection with the access network device from which the broadcast message comes and sends the identifier of the terminal device. Specifically, it also includes the second access network device. Since the first information replied by the core network device to the terminal device is stored in the second access network device, for the second access network device, after establishing a connection with the terminal device, it determines the first information corresponding to the identifier of the terminal device based on the identifier of the terminal device, and thus sends the first information to the terminal device to help the terminal device complete the process of accessing the core network. If the access network device accessed by the terminal device is not the second access network device, there may be the following methods: If the terminal device does not receive the first information sent by the access network device within a period of time, the terminal device automatically releases the connection with the access network device. Or, when the terminal device establishes a connection with the access network device, it sends an indication message to the access network device to indicate the access network device to send the information replied by the core network device to the terminal device. If the access network device determines that it does not store the first information replied by the core network device to the terminal device based on the identifier of the terminal device, it releases the connection with the terminal device or indicates the terminal device to release the connection.

[0244] Step 705: The second access network device sends the first information to the terminal device, where the first information is the information replied by the core network device to the terminal device based on the first request; the terminal device receives the first information.

[0245] Exemplarily, the first information may be any of the following: information for indicating acceptance of the access of the terminal device to the core network (such as attach accept, registration accept, etc.), an authentication request, an N1 message, etc., a non-access stratum message (NAS message).

[0246] As described in step 704, since the second access network device stores the first information replied by the core network device to the terminal device, and the second access network device can determine the identifier of the terminal device corresponding to the first information, after the terminal device establishes a connection with the second access network device and sends the identifier of the terminal device to the second access network device, the second access network device can determine the first information corresponding to the terminal device based on the identifier of the terminal device, and thus send the first information to the terminal device to help the terminal device complete the process of accessing the core network.

[0247] It can be seen that in the embodiment of Figure 7 after the terminal device sends a first request to the first access network device, even if the terminal device disconnects the connection with the first access network device, since the terminal device establishes a connection with the second access network device that stores the first information and sends the identifier of the terminal device to the second access network device, the second access network device can determine the first information replied by the stored core network device to the terminal device based on the identifier of the terminal device, and then send the first information to the terminal device, so it can also help the terminal device complete the process of accessing the core network.

[0248] Next, the Figures 8 to 15 will be combined with Figure 7 to describe the communication method shown in detail.

[0249] Specifically, in the embodiment of Figure 8 the first access network device determines that both the access network device from which the terminal device initiates the connection and the access network device that receives the first information sent by the core network device are the first access network device. That is to say, Figure 8 in the embodiment of

[0250] Next, a detailed description will be given in combination with Figure 8 . Figure 8 is a schematic flowchart of the communication method provided by the embodiment of the present application. Figure 8 The method 800 shown includes steps 801 to 810. Each step in the method 800 will be described in detail below.

[0251] Step 801: Establish a connection between the terminal device and the first access network device.

[0252] It should be understood that before the terminal device sends the first request to the first access network device, it first needs to establish a connection with the first access network device. For example, the terminal device performs cell selection and random access and then establishes a connection with the first access network device. Among them, the process of how the terminal device establishes a connection with the first access network device can refer to the above process of the terminal device accessing the base station.

[0253] After the terminal device establishes a connection with the first access network device, the terminal device can send RRC layer information and part of the NAS information.

[0254] Step 802: The terminal device sends a first request to the first access network device; the first access network device receives the first request.

[0255] It can be understood that the first request in this application is the information of the NAS layer.

[0256] Among them, the detailed content of this step can be referred to Figure 7 the description in S701 in the embodiment, which will not be elaborated here.

[0257] Step 803: The first access network device determines a first duration according to the ephemeris information.

[0258] Specifically, after receiving the first request, the first access network device will determine the first duration. Specifically, the first duration can be considered as the timing for triggering the terminal device to establish a connection with the first access network device. Therefore, the first duration determined by the first access network device is also called the access timer of the terminal device determined by the first access network device information. For example, if the first duration is 30 seconds, the terminal device will establish a connection with the first access network device after 30 seconds from the receipt of the first duration indicated by the first access network device.

[0259] In this embodiment, when the first access network device determines the first duration, the first duration needs to meet the following conditions: after the first duration, the first access network device can cover the terminal device, and the first access network device has obtained (or stored) the first information replied by the core network device to the terminal device. Or in other words, the first duration needs to meet the following conditions: after the first duration, the access connection between the first access network device and the terminal device will be available again, and within the first duration, the power supply connection between the first access network device and the ground station will be available so that the first information sent by the core network device to reply to the terminal device can be stored. The description of the first information can be referred to Figure 7 the description in the embodiment, which will not be elaborated here.

[0260] Step 804: The first access network device sends second information to the terminal device, and the second information is used to indicate the first duration; the terminal device receives the second information.

[0261] Step 805: The terminal device and the first access network device determine the identifier of the terminal device for the initial access process.

[0262] In this embodiment, the identifier of the terminal device is also referred to as the negotiation ID. It can be understood that the role of the negotiation ID is to identify the terminal device that sends the first request in the initial access process, so as to ensure that the information replied by the core network device to the terminal device, such as the initial access acceptance message, authentication request, etc., is sent to the terminal device.

[0263] This step can occur before or after any one of steps 801 - 804, or the negotiation ID can be sent in any one of 801, 802, 804. For example, when establishing a connection in 801, the first access network device sends a C-RNTI to the terminal device, and this C-RNTI serves as the negotiation ID. Or in 802, the terminal device sends an IMSI to the first access network device, and this IMSI serves as the negotiation ID.

[0264] The Figure 8 In this embodiment, the negotiation ID can be RAN specific (that is, it does not need to be globally unique, as long as it is unique within each RAN), because the terminal device will only establish a connection with the first access network device.

[0265] It should be noted that in this embodiment, step 805 is optional. That is, the process of negotiating the negotiation ID between the terminal device and the first access network device is optional. For example, if the terminal device also carries the identifier of the terminal device when sending the first request, this step may not be required at this time.

[0266] Step 806: When the power feed connection between the first access network device and the core network device is available, the first access network device indicates the first request of the terminal device to the core network device.

[0267] Optionally, the first access network device can send the identifier of the first access network device to the core network device to indicate to the core network device that the first access network device is the access network device that receives the information replied by the core network device to the terminal device.

[0268] Step 807: The core network device indicates the first information to be replied to the terminal device to the first access network device.

[0269] In this embodiment, for the core network device, after receiving the first request from the terminal device for accessing the core network forwarded by the first access network device, it will determine the first information to be fed back to the terminal device. For example, the first information can be any one of the following: attach accept, Registration accept, authentication request, N1 message, etc.

[0270] It can be understood that the core network device indicates the first information to be replied to the terminal device to the first access network device, specifically referring to that the core network device indicates the first information to be replied to the terminal device when the power feed connection between the first access network device and the ground station is available.

[0271] Specifically, the core network device sends the first information and the identifier used to identify the terminal device determined by the first access network device and the core network device, which can be considered as Figure 7 the second identifier in the embodiment. For example, it can also be expressed as identifier 2. Correspondingly, the first access network device determines the negotiation ID corresponding to the first information replied by the core network device based on the correspondence between the negotiation ID and identifier 2.

[0272] In some embodiments, identifier 2 is the same as the negotiation ID, and in other embodiments, identifier 2 is different from the negotiation ID.

[0273] Step 808: After the first duration ends, the terminal device establishes a connection with the first access network device.

[0274] Specifically, this step includes: after the first duration ends, the terminal device initiates a random access to the first access network device; the terminal device establishes an RRC connection with the first access network device. More specifically, in this application, when the terminal device establishes a connection with the first access network device, the information sent to the first access network device (i.e., the information at the RRC layer) does not include the information for requesting access to the core network, that is, it does not include the first information. In addition, in this embodiment, when the terminal device re - establishes a connection with the first access network device, it sends the negotiation ID determined with the first access network device before to the first access network device.

[0275] Optionally, after the first duration ends, the terminal device initiating a random access to the first access network device and the terminal device establishing an RRC connection with the first access network device can also be replaced by: the terminal device initiates an RRC resume to the first access network device. The difference is that: for the case of initiating a random access, the terminal device and the first access network device do not retain the RRC context, re - initiate a random access and establish a new RRC context. If an RRC resume is initiated, the first access network device and the terminal device need to retain the RRC context.

[0276] Optionally, the terminal device may further send fifth information to the first access network device, where the fifth information is used to instruct the first access network device to feedback the information replied by the core network device to the terminal based on the first information. That is, it can be considered that the terminal device indicates to the first access network device to feedback the information replied by the core network device to the terminal device based on the first information.

[0277] In this embodiment, during the process of establishing a connection between the terminal device and the first access network device, the terminal device sends a negotiation ID to the first access network device.

[0278] Step 809: The first access network device determines, based on the negotiation ID of the terminal device, that the first information replied by the core network device to the terminal device is stored.

[0279] Specifically, when the first access network device obtains the negotiation ID of the terminal device, the first access network device determines the first information replied by the core network device to the terminal device based on the corresponding relationship between the negotiation ID and the identifier 2.

[0280] Step 810: The first access network device sends the first information to the terminal device.

[0281] It can be seen that in the communication method provided in this embodiment, by instructing the first duration to the terminal device through the first access network device, the terminal device is triggered to re - establish a connection with the first access network device after the first duration ends. Further, the first access network device determines, based on the negotiation ID of the terminal device, that the first information replied by the core network device to the terminal device is stored, and then forwards the first information to the terminal device, thereby helping the terminal device complete the process of accessing the core network.

[0282] Figure 9 It is a schematic flowchart of a communication method 900 provided by another embodiment of the present application. The Figure 9 In this embodiment, it is still the first access network device that determines the access network device where the terminal device initiates a connection and the access network device that receives the first information sent by the core network device. However, the difference from the Figure 8 embodiment is that: the access network device where the terminal device initiates a connection and the access network device that receives the first information sent by the core network device determined by the first access network device are not the first access network device. That is Figure 9 in the embodiment, the second access network device is different from the first access network device.

[0283] Next, in combination with Figure 9 a detailed description will be given. Figure 9 It is a schematic flowchart of a communication method provided by an embodiment of the present application. Figure 9 The method 900 shown includes steps 901 to step 910. The following details each step in the method 900.

[0284] Step 901: Establish a connection between the terminal device and the first access network device.

[0285] Step 902: The terminal device sends a first request to the first access network device; the first access network device receives the first request.

[0286] Step 903: The first access network device determines a first duration according to the ephemeris information.

[0287] In this embodiment, when the first access network device determines the first duration, the first duration needs to satisfy that after the first duration, the second access network device can cover the terminal device, and the second access network device has obtained (or stored) the first information replied by the core network device to the terminal device. Or in other words, the first duration needs to satisfy that after the first duration, the access connection between the second access network device and the terminal device will be available again, and within the second duration, the power supply connection between the second access network device and the ground station will be available so that the first information replied by the core network device to the terminal device can be stored.

[0288] Step 904: The first access network device sends second information to the terminal device, and the second information is used to indicate the first duration; the terminal device receives the second information.

[0289] This step can refer to Figure 8 the content in S804 in the embodiment, which will not be elaborated here.

[0290] Step 905: The terminal device and the first access network device determine the identifier of the terminal device for the initial access process.

[0291] In this embodiment, the identifier determined by the terminal device and the first access network device is also referred to as the negotiation ID. The content of the negotiation ID can refer to Figure 8 the description in step 802 in the embodiment, which will not be elaborated here.

[0292] The content of this step can refer to Figure 8 the content in S805 in the embodiment, which will not be elaborated here.

[0293] Step 906: When the power supply connection between the first access network device and the core network device is available, the first access network device indicates the first request of the terminal device to the core network device.

[0294] In this embodiment, when the first access network device sends the first request to the core network device, it also indicates the negotiation ID to the core network device.

[0295] In this embodiment, the first access network device also sends the identifier of the second access network device to the core network device, so as to instruct the core network device to send the first information to be replied to the terminal device to the second access network device. That is to say, in this embodiment, the first access network device sends the identifier of the access network device for receiving the first information to the core network device.

[0296] Step 907: The core network device instructs the second access network device to reply the first information to the terminal device.

[0297] It can be understood that the core network device instructing the second access network device to reply the first information to the terminal device specifically means that the core network device instructs the second access network device to reply the first information to the terminal device when the power supply connection between the second access network device and the ground station is available.

[0298] In this embodiment, the core network device sends the first information and the negotiation ID in step 902 to the second access network device, so that the second access network device can determine the identifier (negotiation ID) of the terminal device corresponding to the first information replied by the core network device.

[0299] Step 908: After the first duration ends, the terminal device establishes a connection with the second access network device.

[0300] Specifically, this step includes: the terminal device initiates random access to the second access network device; the terminal device establishes an RRC connection with the second access network device.

[0301] In addition, in this embodiment, when establishing a connection with the second access network device, the terminal device sends the negotiation ID determined with the first access network device before to the first access network device.

[0302] Optionally, the terminal device may also send a fifth piece of information to the first access network device, and the fifth piece of information is used to instruct the second access network device to feedback the information replied by the core network device to the terminal based on the first information. That is, it can be considered that the terminal device instructs the second access network device to feedback the information replied by the core network device to the terminal device based on the first information.

[0303] Step 909: The second access network device determines the first information replied by the core network device to the terminal device according to the negotiation ID of the terminal device.

[0304] It can be understood that in step 907, the core network device instructs the second access network device to reply the first information to the terminal device and the negotiation ID corresponding to the first information; therefore, after the terminal device establishes a connection with the second access network device and sends the negotiation ID, the second access network device determines and stores the first information replied by the core network device to the terminal device based on the negotiation ID.

[0305] Step 910: The second access network device sends the first information to the terminal device.

[0306] It can be seen that in the communication method provided in this embodiment, the first access network device indicates the first duration to the terminal device, so that the terminal device establishes a connection with the second access network device after the end of the first duration. Further, the second access network device determines the first information replied by the core network device to the terminal device based on the negotiation ID of the terminal device, and then forwards the first information to the terminal device, thereby helping the terminal device complete the process of accessing the core network.

[0307] Optionally, Figure 9 In the shown embodiment, the access network device in step 906 may not send the identifier of the second access network device to the core network device; correspondingly,

[0308] Step 907 is replaced with: The core network device indicates the first information to be replied to the terminal device to the first access network device;

[0309] Step 909 is replaced with: The second access network device obtains the first information replied by the core network device to the terminal device from the first access network device based on the negotiation ID of the terminal device. For example, the second access network device sends the negotiation ID of the terminal device to multiple access network devices, and the multiple access network devices include the first access network device. After receiving the negotiation ID of the terminal device, the first access network device determines that it stores the first information replied by the core network device to the terminal device and sends the first information to the second access network device.

[0310] Figure 10 It is another flowchart of the communication method 1000 provided by the embodiments of the present application. Figure 10 In the embodiment, the terminal device stores the identifier of the first access network device, and the core network device sends the first information to be replied to the terminal device to the first access network device. Then, when the terminal device receives the broadcast message of the first access network device, it establishes a connection with the first access network device. That is, Figure 10 In the embodiment, the second access network device and the first access network device are the same.

[0311] Such as Figure 10 shown, this Figure 10 embodiment includes:

[0312] Step 1001: Establish a connection between the terminal device and the first access network device.

[0313] Step 1002: The terminal device sends a first request to the first access network device; the first access network device receives the first request.

[0314] Step 1003: The terminal device and the first access network device determine the identifier of the terminal device for the initial access process.

[0315] In this embodiment, this identifier is also referred to as the negotiation ID.

[0316] Among them, for the detailed content of steps 1001 and 1003, reference can be made to Figure 8 the description of the corresponding part in the embodiment, which will not be elaborated here.

[0317] Step 1004: The terminal device stores the identifier of the first access network device.

[0318] For example, the first access network device can display an indication for the terminal device to store the identifier of the first access network device. It can be understood that displaying an indication for the terminal device to store the identifier of the first access network device can also be considered as displaying an indication for the terminal device to establish a connection with the first access network device; or the terminal device defaults to store the identifier of the first access network device. It can be understood that this identifier of the first access network device can be considered as Figure 3 the first identifier in the embodiment.

[0319] Exemplarily, the identifier of the first access network device can be the PCI (Physical Cell Identifier) of the cell included in the first access network device, the ECGI (E-UTRAN Cell Global Identifier) / NCGI (NR Cell Global Identifier) (including eNB / gNB ID) in the SIB1 (System Information Block) message, and the global RAN node ID.

[0320] In this embodiment, the identifier of the first access network device is used to identify the first access network device and can be sent to the terminal device in a broadcast message or in an RRC message.

[0321] Step 1005: When the power supply connection between the first access network device and the core network device is available, the first access network device indicates the first request of the terminal device to the core network device.

[0322] Step 1006: The core network device indicates the first information to be replied to the terminal device to the first access network device.

[0323] For the detailed content of steps 1005 and 1006, reference can be made to Figure 8 the content in steps 806 and 807 in the embodiment, which will not be elaborated here.

[0324] Step 1007: When the terminal device receives (or detects) a broadcast message including the identifier of the first access network device, it establishes a connection with the first access network device.

[0325] Specifically, this step includes: when the terminal device receives a broadcast message including the identifier of the first access network device, the terminal device initiates a random access to the first access network device; the terminal device establishes an RRC connection with the first access network device.

[0326] It can be understood that when the access network device broadcasts, the broadcast message will carry the identifier used to identify the access network device. Therefore, in this embodiment, when the terminal device receives the broadcast message, it can determine whether the access network device from which the currently received broadcast message comes is the first access network device based on the identifier of the broadcast access network device.

[0327] It should be noted that this embodiment does not limit the manner in which the terminal device receives the broadcast message including the identifier of the first access network device.

[0328] For example, in one implementation, the terminal device can keep detecting, or continuously detect, until it detects a broadcast message including the identifier of the first access network device. Or in other words, in this embodiment, after the terminal device sends the first request to the first access network device, even within the NAS timer, it continuously detects the broadcast message including the identifier of the first access network device.

[0329] Concept of NAS timer: The time that the terminal device can wait after sending a NAS message. If a reply is received within this time period, the process can be executed normally. If it exceeds this time period, the terminal device considers that the sent NAS message is lost or incorrect and may resend the NAS message. For example, if the NAS timer of the first information times out, the terminal device may resend the first information. But within the NAS timer time period, the terminal device will wait for a reply, and will not initiate a new message, nor perform actions such as cell selection and random access.

[0330] For example, in another implementation, the terminal device can determine the time period when it will be covered by the first access network device next time (which can also be considered as the time period when the terminal device and the first access network device can access and connect next time). For example, the terminal device determines the time period when it will be covered by the first access network device next time based on ephemeris information, and then the terminal device only detects the broadcast message including the identifier of the first access network device within this time period. It can be understood that this method can reduce the power consumption of the terminal device.

[0331] Optionally, as Figure 10As shown, the first access network device can execute step 00: the first access network device sends at least one of the following to the terminal device: ephemeris information, or the time period for next coverage of the terminal device, or the time interval, where the time interval is specifically the interval between the time when the first access network device next covers the terminal device and the time when the terminal device is currently covered; accordingly, the terminal device is based on the indication of the first access network device and the time period for the next coverage of the terminal device.

[0332] Optionally, step 1107 can also be replaced by: when the terminal device receives a broadcast message including the identifier of the first access network device, it initiates RRC resume to the first access network device, so that the terminal device can re-establish a connection with the first access network device. Similarly, during detection, it can be continuous monitoring, or it can be detected within a target time period.

[0333] It is understandable that when a broadcast message including the identifier of the first access network device is detected, it indicates that the access connection between the terminal device and the first access network device is available, that is, the information sent by the terminal device can be received by the first access network device and the signal sent by the first access network device can be received by the terminal device.

[0334] In this embodiment, when the terminal device detects a broadcast message that does not include the identifier of the first access network device, the terminal device establishes a connection.

[0335] In this embodiment, when the terminal device establishes a connection with the first access network device, it also sends a negotiation ID to the first access network device.

[0336] Step 1008: The first access network device determines and stores the first information fed back by the core network device to the terminal device based on the negotiation ID of the terminal device.

[0337] Step 1009: The first access network device sends first information to the terminal device.

[0338] It can be seen that in the communication method provided in this embodiment, the terminal device will detect a broadcast message including the identifier of the first access network device, and then establish a connection with the first access network device again when the broadcast message including the identifier of the first access network device is detected. The first access network device determines that the first information replied by the core network device to the terminal device is stored based on the negotiation ID of the terminal device, and then forwards the first information to the terminal device, thereby helping the terminal device complete the process of accessing the core network.

[0339] Figure 11 This is another flow diagram of the communication method provided in the embodiment of the present application. Figure 11 In the embodiment, Figure 10The difference in the embodiment is that the terminal device stores the identifier of an access network device different from the first access network device, that is, the terminal device does not establish an RRC connection with the first access network device. Or put it this way, in this embodiment, the second access network device is different from the first access network device.

[0340] As Figure 11 shown, this Figure 11 embodiment includes:

[0341] Step 1101: Establish a connection between the terminal device and the first access network device.

[0342] Step 1102: The terminal device sends a first request to the first access network device; the first access network device receives the first request.

[0343] Step 1103: The terminal device and the first access network device determine the identifier of the terminal device for the initial access process.

[0344] In this embodiment, this identifier is also referred to as the negotiation ID.

[0345] Step 1104: The first access network device sends the identifier of the second access network device to the terminal device.

[0346] The identifier of the second access network device is used to identify the second access network device, and this identifier of the second access network device can also be considered as Figure 3 the first identifier in the embodiment.

[0347] In this embodiment, the second access network device is specifically the access network device determined by the first access network device for sending the first information to the terminal device.

[0348] Optionally, the second access network device is the access network device determined by the first access network device based on ephemeris information that can cover the terminal device fastest and can obtain the first information from the core network device fastest.

[0349] Exemplarily, the first access network device can negotiate with at least one other access network device via an inter-satellite link to determine the second access network device.

[0350] Step 1105: The terminal device stores the identifier of the second access network device.

[0351] Step 1106: When the power supply connection between the first access network device and the core network device is available, the first access network device indicates the first request of the terminal device to the core network device.

[0352] In this embodiment, when the first access network device sends the first request to the core network device, it also indicates the negotiation ID of the terminal device to the core network device.

[0353] In this embodiment, the first access network device also sends the identifier of the second access network device to the core network device, so as to instruct the core network device to send the first information replied to the terminal device to the second access network device. That is to say, in this embodiment, the first access network device sends the identifier of the access network device for receiving the first information to the core network device.

[0354] Step 1107: The core network device instructs the second access network device to reply the first information to the terminal device.

[0355] It can be understood that the core network device instructing the second access network device to reply the first information to the terminal device specifically means that the core network device instructs the second access network device to reply the first information to the terminal device when the power supply connection between the second access network device and the ground station is available.

[0356] In this embodiment, when the core network device sends the first information to the second access network device, it also sends the negotiation ID of the terminal device, so that the second access network device can determine the correspondence between the negotiation ID and the first information, so that the second access network device can determine the terminal device corresponding to the first information replied by the core network device.

[0357] Step 1108: When the terminal device detects a broadcast message including the identifier of the second access network device, it establishes a connection with the second access network device.

[0358] Specifically, this step includes: the terminal device detects a broadcast message including the identifier of the second access network device and initiates random access; the terminal device establishes an RRC connection with the second access network device.

[0359] For example, in one implementation, the terminal device can keep detecting, or be called continuous detection, until it detects a broadcast message including the identifier of the second access network device.

[0360] For another example, in another implementation, the terminal device can determine the period when it will be covered by the second access network device (which can also be considered as the period when the terminal device and the second access network device will be available for the next access connection). For example, the terminal device determines the period when it will be covered by the second access network device based on ephemeris information, and then the terminal device only detects the broadcast message including the identifier of the second access network device during this period.

[0361] Optionally, as Figure 11 shown, the first access network device can perform: the first access network device sends at least one of the following to the terminal device: ephemeris information, the period when the second access network device will cover the terminal device next time, or the time interval, and the time interval is specifically the interval between the time when the second access network device will cover the terminal device and the time when it currently covers the terminal device; correspondingly, the terminal device determines the period when it will be covered by the second access network device next time based on the indication of the first access network device.

[0362] Understandably, when a broadcast message indicating the identifier of the second access network device is detected, it indicates that the access connection between the terminal device and the second access network device is available. That is, the information sent by the terminal device can be received by the second access network device and the signal sent by the second access network device can be received by the terminal device.

[0363] In this embodiment, when the terminal device detects a broadcast message that does not include the identifier of the second access network device, the terminal device does not initiate a random access or an RRC resume.

[0364] In this embodiment, when the terminal device establishes a connection with the second access network device, it also sends a negotiation ID to the second access network device.

[0365] Step 1109: The second access network device determines, based on the negotiation ID of the terminal device, that the first information fed back by the core network device to the terminal device is stored.

[0366] Step 1110: The second access network device sends the first information to the terminal device.

[0367] It can be seen that in the communication method provided in this embodiment, the terminal device will detect a broadcast message including the identifier of the second access network device, and then when detecting a broadcast message including the identifier of the second access network device, establish a connection with the second access network device and send a negotiation ID to the second access network device, so that the second access network device sends the first information replied by the core network device to the terminal device based on this negotiation ID.

[0368] Summarize the above Figures 8 to 11 As shown in the embodiments, it can be seen that Figure 8 and Figure 9 In the embodiments shown, by means of the first access network device indicating the first duration to the terminal device, the terminal device is triggered to establish a connection with the access network device storing the first information, so as to obtain the first information to assist the terminal device in accessing the network. While Figures 10 to 11 In the embodiment shown, by means of the terminal device storing and forwarding the identifier of the access network device storing the first information, the terminal device is triggered to obtain the first information from the access network device storing the first information to assist the terminal device in accessing the network.

[0369] Optionally, the terminal device may not store and forward the identifier of the access network device for the first information, and the first access network device may also not indicate to the terminal device the first duration for triggering the terminal device to establish a connection. Instead, as long as the terminal device detects any one broadcast message, it establishes a connection with the access network device that sends the broadcast message. At this time, it can be understood that for the access network device that stores the first information corresponding to the terminal device, it feeds back the first information to the terminal device. Otherwise, the terminal device releases the RRC connection. Next, in combination with Figure 12 A detailed embodiment of this method.

[0370] In this embodiment, for ease of description, the first access network device is denoted as access network device 1, the access network device for storing the first information is denoted as access network device 2, and the access network device that does not store the first information is denoted as access network device 3, also referred to as the third access network device. It can be understood that access network device 2 is the second access network device described in this application Figure 3 in the above.

[0371] Figure 12 is another flowchart of the communication method provided by the embodiment of this application. As Figure 12 shown, method 1200 includes:

[0372] Step 02: The base station 1 broadcasts ephemeris information.

[0373] This step is optional.

[0374] Step 1201: Establish a connection between the terminal device and access network device 1.

[0375] Step 1202: The terminal device sends a first request to access network device 1; access network device 1 receives the first request.

[0376] Step 1203: The terminal device and access network device 1 determine the identifier of the terminal device for the initial access process.

[0377] In this embodiment, this identifier is also referred to as the negotiation ID.

[0378] For a detailed description of this step, reference can be specifically made to the description in step 805 and will not be elaborated here.

[0379] Step 1204: When the power supply connection between access network device 1 and the core network device is available, access network device 1 indicates the first request of the terminal device to the core network device.

[0380] Step 1205: The core network device determines access network device 2 for forwarding the reply to the terminal device with the first information.

[0381] In this embodiment, the access network device 2 determined by the core network device can be one or more.

[0382] It should be noted that in this embodiment, there is no limitation on how the core network device specifically forwards the first information to the access network device 2.

[0383] Optionally, the core network device can determine based on ephemeris information. For example, the core network device determines the access network device 2 that can cover the terminal device fastest and can obtain the first information from the core network device fastest based on the ephemeris information.

[0384] Optionally, the core network device can send the first information to any one or more base stations. In this case, the core network device does not perform the step of determining the access network device 2 but makes an arbitrary selection.

[0385] Step 1206: The core network device instructs the access network device 2 to reply with the first information to the terminal device.

[0386] It can be understood that the core network device instructing the access network device 2 to reply with the first information to the terminal device specifically means that the core network device instructs the access network device 2 to reply with the first information to the terminal device when the power supply connection between the second access network device and the ground station is available.

[0387] Specifically, in this embodiment, when the core network device sends the first information to the access network device 2, it also indicates a negotiation ID so that the access network device 2 can determine the terminal device corresponding to the first information replied by the core network device.

[0388] Step 1207: The terminal device detects the broadcast message of the access network device 3.

[0389] Step 1208: The terminal device establishes a connection with the access network device 3.

[0390] Specifically, this step includes: the terminal device initiates a random access to the access network device 3; Step 11072: The terminal device establishes a connection with the access network device 3.

[0391] Step 1209: Release the connection with the access network device 3.

[0392] Optionally, this step can be implemented in two ways:

[0393] As Figure 12 shown, in implementation method (a), if the terminal device does not receive the first information sent by the access network device 3 within the second time period, the terminal device automatically releases the RRC connection with the access network device 3.

[0394] As Figure 2As shown, in implementation mode (b), after the terminal device establishes a connection with the access network device 3, it can send third information to the access network device 3, where the third information is used to instruct the access network device 3 to send the information replied by the core network device to the terminal device; correspondingly, after receiving the third information, the access network device 3 determines, according to the negotiation ID of the terminal device, that there is no stored reply information replied by the core network device to the terminal device, and then sends fourth information to the terminal device, where the fourth information is used to instruct the terminal device to release the connection with the access network device 3; the terminal device releases the RRC connection with the access network device 3.

[0395] Step 1210: The terminal device detects the broadcast message of the access network device 2.

[0396] Step 1211: Establish a connection with the access network device 2.

[0397] Specifically, this step includes: the terminal device initiates a random access to the access network device 2; the terminal device establishes an RRC connection with the access network device 2.

[0398] In addition, in this embodiment, when the terminal device establishes a connection with the access network device 2, it sends the negotiation ID previously determined with the access network device 1 to the access network device 2.

[0399] Step 1212: The access network device 2 determines, based on the negotiation ID, that there is stored the first information replied by the core network device to the terminal device, and sends the first information to the terminal device.

[0400] Optionally, the terminal device can also send fifth information to the access network device 2, where the fifth information is used to instruct the access network device 2 to feedback the information replied by the core network device to the terminal based on the first information. That is, it can be considered that the terminal device explicitly instructs the access network device 2 to feedback the information replied by the core network device to the terminal device based on the first information.

[0401] It can be seen that Figure 12 In the shown embodiment, as long as the terminal device detects the broadcast message, it establishes a connection with the access network device that sends the broadcast message. At this time, for the access network device that has established a connection with the terminal device, if it stores the first information replied by the core network device to the terminal device, it sends the first information to the terminal device to help the terminal device access the network. Otherwise, if it does not store it, it does not send any message to the terminal device or instructs the terminal device to release the RRC connection to inform the terminal device that the current access network device does not store the first information sent by the core network device to the terminal device.

[0402] It should be noted that Figure 12The embodiments are only described by taking one of the access network devices 2 determined by the core network device as an example. It can be understood that when there are multiple access network devices 2 determined by the core network device to send the first information, at this time, the core network device will send the first information and the negotiation ID to all the access network devices 2.

[0403] Optionally, the core network device may configure a timer for the one or more access network devices 2; correspondingly, for the multiple access network devices, when the timer expires, the stored first information is deleted. Exemplarily, when determining the timer, the core network device may determine it based on the time of the access network device 2 that can cover the terminal device fastest. For example, Figure 12 In the embodiment, the access network device 2 will definitely cover the UE after 100 us. At this time, the timer can be set to 100 us. In this way, while ensuring that the terminal device can receive the information replied by the core network device, it can also ensure that all the access network devices storing the first information delete the first information in the fastest time.

[0404] Figure 13 is a schematic flowchart of a communication method provided by another embodiment of the present application. The Figure 13 In the embodiment, the terminal device defaults to only detect the broadcast message including the identifier of the first access network device; then the core network device determines by itself the second access network device that stores and forwards the reply to the terminal device, and sends the identifier of the first access network device to the second access network device, so that the second access network device also broadcasts the identifier of the first access network device when broadcasting the message. Hereinafter, taking the case where the second access network device and the first access network device are not the same access network device as an example, the detailed embodiment of this method is described.

[0405] Such as Figure 13 shown, the Figure 13 method 1300 of this embodiment includes:

[0406] Step 1301: Establish a connection between the terminal device and the first access network device.

[0407] Optionally, the first access network device may also send ephemeris information to the terminal device. For example, the first access network device broadcasts the ephemeris information, or sends the ephemeris information to the terminal device through an RRC message after establishing the connection.

[0408] Step 1302: The terminal device sends a first request to the first access network device; the first access network device receives the first request.

[0409] Step 1303: The terminal device and the first access network device determine the identifier of the terminal device used in the initial access process.

[0410] In this embodiment, the identifier is also referred to as a negotiation ID.

[0411] Specifically, in this embodiment, the negotiation ID must be globally unique because different access network devices need to send messages to the terminal device. If it is not globally unique, the IDs negotiated by different access network devices and different terminal devices may be duplicated.

[0412] Step 1304: When the power supply connection between the first access network device and the core network device is available, the first access network device indicates the first request of the terminal device to the core network device.

[0413] In this embodiment, when the first access network device sends the first request to the core network device, it also indicates the negotiation ID and the identifier of the first access network device.

[0414] Optionally, the first access network device may also send the location information of the terminal device to the core network device.

[0415] Step 1305: The core network device sends the first information, the negotiation ID, and the identifier of the first access network device to the second access network device.

[0416] It should be noted that this embodiment still does not limit the manner in which the core network device determines the second access network device.

[0417] For example, the second access network device is an access network device that can obtain the first information faster and cover the terminal device fastest based on the ephemeris information.

[0418] In this embodiment, the core network device sends the identifier of the first access network device to the second access network device mainly for the second access network device to broadcast the identifier of the first access network device during broadcasting. That is, when the second access network device broadcasts, the identifier of the access network device it broadcasts includes the identifier of the first access network device and the identifier of the second access network device.

[0419] Step 1306: The second access network device sends a broadcast message, and the broadcast message includes the identifier of the first access network device; the terminal device detects the broadcast message including the identifier of the first access network device.

[0420] It should be understood that the access network devices capable of broadcasting the identifier of the first access network device include the first access network device and the second access network device. However, the first access network device does not store the first information, and the second access network device stores the first information. Therefore, in this embodiment, when the terminal device detects the broadcast message that broadcasts the identifier of the first access network device, if the broadcast message is from the first access network device, the terminal device will not receive the first information. At this time, the terminal device can release the connection. Specifically, the manner of releasing the connection can refer to Figure 12 the content of step 1208 in the illustrated embodiment, which will not be elaborated here.

[0421] Optionally, in this embodiment, the second access network device may include the identifier of the first access network device in the broadcast message only during the period when the terminal device is covered. The implementation manner may refer to Figure 7 the detailed description in the third implementation manner of step 704 in the embodiment, and will not be elaborated here.

[0422] In this embodiment, it is assumed that the broadcast message including the identifier of the first access network device comes from the second access network device. Among them, for the case where it is not the second access network device, reference may be made to the description in step 1306, which will not be elaborated here.

[0423] Step 1307: The terminal device establishes a connection with the second access network device.

[0424] Similarly, it includes: the terminal device initiates random access to the second access network device; the terminal device establishes an RRC connection with the second access network device.

[0425] In this embodiment, during the process of the terminal device establishing a connection with the second access network device, a negotiation ID is sent to the second access network device.

[0426] Step 1308: The second access network device determines, based on the negotiation ID, that the first information replied by the core network device to the terminal device is stored, and sends the first information to the terminal device.

[0427] Since the second access network device stores the correspondence between the negotiation ID and the first information, the second access network device can determine the stored first information based on the negotiation ID sent by the terminal device.

[0428] Step 1309: The second access network device sends the first information to the terminal device.

[0429] It can be seen that in the communication method provided in this embodiment, for the terminal device side, the terminal device will detect the broadcast message including the identifier of the first access network device, and then when detecting the broadcast message including the identifier of the first access network device, establish a connection with the access network device from which the broadcast message comes. Correspondingly, for the core network device side, the identifier of the first access network device will be sent to the second access network device so that the second access network device broadcasts the identifier of the first access network device during broadcasting. In this way, when the terminal device detects the broadcast message of the second access network device and establishes a connection with the second access network device, the second access network device can determine that the first information replied by the core network device to this terminal device is stored, so as to continue to complete the network access process of the terminal device.

[0430] Figure 14 It is a schematic flowchart of a communication method provided by another embodiment of the present application. As Figure 14As shown, the Figure 14 embodiment includes:

[0431] Step 1401: Establish a connection between the terminal device and the first access network device.

[0432] Step 1402: The terminal device sends a first request to the first access network device; the first access network device receives the first request.

[0433] Step 1403: The terminal device and the first access network device determine the identifier of the terminal device used in the initial access process.

[0434] Step 1404: The terminal device determines the second access network device that initiates the connection.

[0435] Alternatively, from another perspective, the terminal device determines the second access network device that stores the first information replied by the core network device to the terminal device.

[0436] Step 1405: When the power feeding connection between the first access network device and the core network device is available, the first access network device sends the negotiation ID of the terminal device and the first request to the core network device.

[0437] Step 1406: The core network device determines the second access network device that stores the first information replied to the terminal device.

[0438] Alternatively, from another perspective, the terminal device determines the second access network device that the terminal device initiates the connection to.

[0439] In this embodiment, when the terminal device and the core network device determine, it is necessary to ensure that the determined second access network devices are the same. Therefore, in one implementation manner, for example, the same rule can be preset in the terminal device and the core network device, and through this rule, it is ensured that the second access network devices determined by the terminal device and the core network device are the same.

[0440] Exemplarily, the rule can be: Determine the access network device that can obtain the reply to the first information of the terminal device from the core network device fastest and can cover the location of the terminal device fastest as the second access network device. In some implementation manners, the terminal device and the core network device determine the second access network device according to at least one of the ephemeris information and the following information: the location of the terminal device, the current time.

[0441] Step 1407: The core network device sends the first information and the negotiation ID of the terminal device to the second access network device.

[0442] Step 1408: The terminal device detects a broadcast message including the second access network device.

[0443] Step 1409: The terminal device establishes a connection with the second access network device.

[0444] In this embodiment, during the process of the terminal device establishing a connection with the second access network device, the negotiation ID is sent to the second access network device.

[0445] Similarly, it includes: the terminal device initiating a random access to the second access network device; the terminal device establishing an RRC connection with the second access network device.

[0446] Step 1410: The second access network device determines, based on the negotiation ID, that the first information replied by the core network device to the terminal device is stored, and sends the first information to the terminal device.

[0447] Optionally, the terminal device may instruct the access network device 2 to send the first information replied by the core network device to the terminal device.

[0448] Step 1411: The second access network device sends the first information to the terminal device.

[0449] It can be seen that in the method provided in this embodiment, through a preset rule, the terminal device and the core network device respectively determine the same second access network device, so that the access network device for the terminal device to establish a connection is the access network device that stores the first information replied by the core network device to the terminal device, thereby realizing the continuation of the network access process of the terminal device.

[0450] Figure 15 It is a flowchart of a communication method provided by another embodiment of the present application. As Figure 15 shown, this Figure 15 embodiment includes:

[0451] Step 1501: A connection is established between the terminal device and the first access network device.

[0452] Step 1502: The terminal device sends a first request to the first access network device; the first access network device receives the first request.

[0453] Step 1503: The terminal device and the first access network device determine the identifier of the terminal device for the initial access process.

[0454] Step 1504: The terminal device determines the second access network device to initiate a connection.

[0455] Alternatively, from another perspective, the terminal device determines the second access network device that stores the first information replied by the core network device to the terminal device.

[0456] Step 1505: The terminal device sends the identifier of the second access network device to the first access network device.

[0457] It can be understood that the identifier of this second access network device can be considered asFigure 7 The first identifier in the embodiment.

[0458] Specifically, in this embodiment, the main purpose for the terminal device to send the identifier of the second access network device to the first access network device is to forward the identifier of the second access network device to the core network device through the first access network device, so that the core network device can determine the access network device to which the terminal device establishes a connection. Or from another perspective, it enables the core network device to determine the second access network device that stores the first information to be replied to the terminal device.

[0459] Step 1506: When the power feeding connection between the first access network device and the core network device is available, the first access network device sends the negotiation ID of the terminal device, the first request, and the identifier of the second access network device to the core network device.

[0460] Or, from another perspective, the terminal device determines the second access network device to which the terminal device initiates a connection.

[0461] Exemplarily, the terminal device determines the access network device that can obtain the first information replied to the terminal device from the core network device fastest and can cover the location of the terminal device fastest as the second access network device. In some implementation manners, the terminal device determines the second access network device according to the ephemeris information and at least one of the following information: the location of the terminal device, the current time.

[0462] Step 1507: The core network device sends the first information and the negotiation ID of the terminal device to the second access network device.

[0463] Step 1508: The terminal device detects a broadcast message including the second access network device.

[0464] Step 1509: The terminal device establishes a connection with the second access network device.

[0465] Similarly, it includes: the terminal device initiates random access to the second access network device; the terminal device establishes an RRC connection with the second access network device.

[0466] In this embodiment, when the terminal device establishes a connection with the second access network device, it sends the negotiation ID to the second access network device.

[0467] Step 1510: The second access network device determines, based on the negotiation ID, that it stores the first information replied by the core network device to the terminal device, and sends the first information to the terminal device.

[0468] Optionally, the terminal device may instruct the second access network device to send the first information replied by the core network device to the terminal device.

[0469] Step 1511: The second access network device sends the first information to the terminal device.

[0470] It can be seen that in the method provided in this embodiment, the second access network device for establishing a connection is determined by the terminal device. Or from another perspective, the terminal device determines the second access network device storing the first information, and then the terminal device notifies the core network device of the identifier of the second access network device, so as to ensure that the core network device sends the first information replied to the terminal device to the second access network device to which the terminal device is about to establish a connection, thereby helping the terminal device to continue to complete the network access process of the terminal device.

[0471] In the above text, in combination with Figures 7 to 15 , the communication method of the embodiment of the present application is described in detail. Next, in combination with Figure 16 and Figure 17 , the communication device provided by the present application will be described in detail.

[0472] Figure 16 It is a structural schematic diagram of a communication device provided by an embodiment of the present application. Specifically, as Figure 16 shown, the device 1600 includes: a receiving module 1601, a sending module 1602, and a processing module 1603.

[0473] In the first embodiment, the device 1600 can be applied to a terminal device.

[0474] Specifically, the sending module 1602 is configured to send a first request to the first access network device, where the first request is used to indicate that the terminal device requests to access the core network; the processing module 1603 is configured to establish a connection with the second access network device and send the identifier of the terminal device to the second access network device; the receiving module 1601 is configured to receive first information from the second access network device, where the first information is information replied by the core network to the terminal device based on the first request, and the first information corresponds to the identifier of the terminal device.

[0475] In a possible implementation manner, the second access network device and the first access network device are the same access network device, or the second access network device and the first access network device are different access network devices.

[0476] In a possible implementation manner, the receiving module 1601 is configured to receive second information sent by the first access network device, where the second information is used to indicate a first duration; the processing module 1603 is further configured to: establish a connection with the second access network device after the first duration.

[0477] In a possible implementation manner, the first duration is determined by the first access network device based on ephemeris information.

[0478] In a possible implementation, the processing module 1602 is further configured to: obtain a first identifier, where the first identifier is used to identify a second access network device; and establish a connection with the second access network device when receiving the first identifier from the second access network device.

[0479] In a possible implementation, the receiving module 1601 is further configured to: receive a first identifier from a first access network device.

[0480] In a possible implementation, the processing module 1602 is further configured to: determine the first identifier according to ephemeris information.

[0481] In a possible implementation, the sending module 1602 is further configured to: send the first identifier to the first access network device.

[0482] In a possible implementation, the processing module 1602 is further configured to: establish a connection with a third access network device; and release the connection with the third access network device if the first information sent by the third access network device is not received within a second duration.

[0483] In a possible implementation, the sending module 1602 is further configured to: send third information to the third access network device, where the third information is used to instruct the third access network device to send the information replied by the core network device to the terminal device; the receiving module 1601 is further configured to: receive fourth information sent by the third access network device in response to the third information, where the fourth information is used to instruct the terminal device to release the connection with the third access network device; and the processing module 1602 is further configured to: release the connection with the third access network device.

[0484] In a possible implementation, the sending module 1602 is further configured to: send fifth information to the second access network device, where the fifth information is used to instruct the second access network device to send the information replied by the core network device to the terminal device.

[0485] In the second embodiment, the communication device may be applied to a first access network device.

[0486] Specifically, the receiving module 1601 is configured to: receive a first request, where the first request is used to instruct the terminal device to request access to the core network; the sending module 1602 is configured to: send second information to the terminal device, where the second information is used to indicate a first duration, and the terminal device establishes a connection with a second access network device after the first duration ends, and the second access network device is used to store first information replied by the core network device based on the first request; the sending module 1602 is further configured to: send the first request to the core network device.

[0487] In a possible implementation, when the second access network device and the first access network device are different access network devices, the sending module 1602 is further configured to send the identifier of the second access network device to the core network device.

[0488] In a possible implementation, the first duration is determined by the first access network device based on ephemeris information.

[0489] In a possible implementation, when the second access network device and the first access network device are the same access network device, the receiving module 1601 is further configured to receive fifth information from the terminal device, where the fifth information is used to instruct the second access network device to send the information replied by the core network device to the terminal device.

[0490] In the third embodiment, the communication device may be applied to the first access network device.

[0491] Specifically, the receiving module 1601 is configured to receive a first request, where the first request is used to instruct the terminal device to request access to the core network; the sending module 1602 is configured to send a first identifier to the terminal, where the first identifier is used to identify the second access network device, and the second access network device is used to store the first information replied by the core network device to the terminal device based on the first request; the sending module 1602 is further configured to send the first request to the core network device.

[0492] In a possible implementation, the sending module 1602 is further configured to: send a first identifier to the core network device, where the first identifier is used for the core network device to determine to send the first information to the terminal device through the second access network device.

[0493] In a possible implementation, the second access network device and the first access network device are the same access network device, or the second access network device and the first access network device are different access network devices.

[0494] In a possible implementation, when the second access network device and the first access network device are the same access network device, the receiving module 1601 is further configured to receive fifth information from the terminal device, where the fifth information is used to instruct to send the information replied by the core network device to the terminal device.

[0495] In the fourth embodiment, the communication device may be applied to the second access network device.

[0496] Specifically, a receiving module 1601 is configured to receive first information from a core network device. The first information is information replied by the core network to a terminal device based on a first request, where the first request is used to instruct the terminal device to request access to the core network, and the first information corresponds to a first terminal device identifier. A sending module 1602 is configured to, upon receiving the first terminal device identifier, send the first information to the terminal device that sent the first terminal device identifier.

[0497] In a possible implementation, the first terminal device identifier is sent by the core network device to the second access network device.

[0498] Figure 17 It is a structural schematic diagram of a communication device provided in another embodiment of this application. Figure 17 The illustrated device can be used to execute the method described in any of the foregoing embodiments.

[0499] As Figure 17 As shown, the device 1700 in this embodiment includes: a memory 1701 and a processor 1702. In one implementation, the device 1700 further includes a communication interface 1703 and a bus 1704. Among them, the memory 1701, the processor 1702, and the communication interface 1703 are communicatively connected to each other through the bus 1704.

[0500] The memory 1701 can be a read only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 1701 can store a program. When the program stored in the memory 1701 is executed by the processor 1702, the processor 1702 is configured to execute Figures 7 to 15 each step of the method shown.

[0501] The processor 1702 can be a general-purpose central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), or one or more integrated circuits, and is configured to execute relevant programs to implement this application Figures 7 to 15 the method shown.

[0502] The processor 1702 can also be an integrated circuit chip with signal processing capabilities. During implementation, each step of the method in the embodiment of this application Figures 7 to 15 can be completed by the hardware integrated logic circuit in the processor 1702 or instructions in software form.

[0503] The above-mentioned processor 1702 may also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or the processor may also be a conventional processor, etc.

[0504] The steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or may be executed and completed by a combination of hardware and software modules in the decoding processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory 1001, and the processor 1702 reads the information in the memory 1701 and combines its hardware to complete the functions required to be executed by the units included in the device of the present application. For example, it may execute Figures 7 to 15 each step / function of the illustrated embodiment.

[0505] The communication interface 1703 may use, but is not limited to, a transceiver device such as a transceiver to implement the communication between the device 1700 and other devices or communication networks.

[0506] The bus 1704 may include a path for transmitting information between the various components of the device 1700 (for example, the memory 1701, the processor 1702, and the communication interface 1703).

[0507] It should be understood that the device 1700 shown in the embodiments of the present application may be an electronic device, or may also be a chip configured in an electronic device. The device 1700 may be deployed in a terminal device, or may also be deployed in a network device.

[0508] The present application also provides a computer program product, which includes: a computer program (which may also be referred to as code, or instruction), and when the computer program is run, it can implement Figures 7 to 15 the steps executed by the terminal, the authentication network element, or the storage network element in any one of the illustrated embodiments.

[0509] The present application also provides a computer-readable storage medium, which stores a computer program (which may also be referred to as code, or instruction). When the computer program is run, it can implement Figures 7 to 15 the steps executed by the terminal, the authentication network element, or the storage network element in any one of the illustrated embodiments.

[0510] An embodiment of the present application provides a communication system, which includes the terminal device, the first access network device, the second access network device, and the core network device as described above.

[0511] The above embodiments can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wired (such as infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be an available medium that the computer can access, or a data storage device such as a server or data center that includes one or more available medium sets. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state drive.

[0512] It should be understood that the term "and / or" in this document is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Here, A and B can be singular or plural. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after, but it may also represent an "and / or" relationship, which can be specifically understood with reference to the context before and after.

[0513] In the present application, "at least one" means one or more, and "a plurality" means two or more. "At least one of the following items" or its similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, and c can be single or plural.

[0514] It should be understood that in various embodiments of the present application, the magnitudes of the sequence numbers of the above processes do not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not limit the implementation process of the embodiments of the present application.

[0515] Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0516] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0517] In several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of devices or units can be in electrical, mechanical, or other forms.

[0518] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0519] In addition, the functional units in each embodiment of this application can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit.

[0520] When the above-mentioned functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The foregoing storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories, random access memories, magnetic disks, or optical discs.

Claims

1. A communication method, characterized in that, Applied to a terminal device, including: Sending a first request to a first access network device, where the first request is used to indicate that the terminal device requests to access the core network; Establishing a connection with a second access network device and sending an identifier of the terminal device to the second access network device; Receiving first information from the second access network device, where the first information is information replied by the core network to the terminal device based on the first request, and the first information corresponds to the identifier of the terminal device.

2. The method according to claim 1, characterized in that, The second access network device and the first access network device are the same access network device, or the second access network device and the first access network device are different access network devices.

3. The method according to claim 1 or 2, characterized in that, The method further includes: Receiving second information sent by the first access network device, where the second information is used to indicate a first duration; The establishing a connection with the second access network device includes: After the first duration, establishing a connection with the second access network device.

4. The method according to claim 3, characterized in that The first duration is determined by the first access network device based on ephemeris information.

5. The method according to claim 1 or 2, characterized in that, The method further includes: Obtaining a first identifier, where the first identifier is used to identify the second access network device; The establishing a connection with the second access network device includes: When receiving the first identifier from the second access network device, establishing a connection with the second access network device.

6. The method according to claim 5, characterized in that, The obtaining the first identifier includes: Receiving the first identifier from the first access network device.

7. The method according to claim 5, wherein The obtaining the first identifier includes: Determining the first identifier according to ephemeris information.

8. The method according to claim 7, wherein The method further includes: Sending the first identifier to the first access network device.

9. The method according to any one of claims 1 to 8, characterized in that The method further includes: Establishing a connection with a third access network device; If the first information sent by the third access network device is not received within a second duration, releasing the connection with the third access network device.

10. The method according to claim 9, wherein The method further includes: Sending third information to the third access network device, where the third information is used to indicate that the third access network device sends information replied by the core network device to the terminal device; Receiving fourth information sent by the third access network device in response to the third information, where the fourth information is used to indicate that the terminal device releases the connection with the third access network device; Releasing the connection with the third access network device.

11. The method according to any one of claims 1 to 10, characterized in that, The method further includes: Sending fifth information to the second access network device, where the fifth information is used to indicate that the second access network device sends information replied by the core network device to the terminal device.

12. A communication method, characterized in that, Applied to a first access network device, including: Receiving a first request, where the first request is used to indicate that a terminal device requests to access the core network; Sending second information to the terminal device, where the second information is used to indicate a first duration, where the terminal device establishes a connection with a second access network device after the first duration ends, and the second access network device is used to store first information replied by the core network device to the terminal device; Sending the first request to the core network device.

13. The method according to claim 12, characterized in that, The second access network device and the first access network device are the same access network device, or the second access network device and the first access network device are different access network devices.

14. The method according to claim 12 or 13, characterized in that, When the second access network device is different from the first access network device, the method further includes: Sending an identifier of the second access network device to the core network device.

15. The method according to any one of claims 12 to 14, characterized in that The first duration is determined by the first access network device based on ephemeris information.

16. The method according to claim 13 or 15, characterized in that When the second access network device and the first access network device are the same access network device, the method further includes: Receiving fifth information from the terminal device, where the fifth information is used to indicate information sent by the core network device in response to the terminal device.

17. A communication method, characterized in that, Applied to a first access network device, it includes: Receiving a first request, where the first request is used to indicate that a terminal device requests access to the core network; Sending a first identifier to the terminal, where the first identifier is used to identify a second access network device, and the second access network device is used to store first information sent by the core network device in response to the first request to the terminal device; Sending the first request to the core network device.

18. The method according to claim 17, wherein The method further includes: Sending the first identifier to the core network device, where the first identifier is used for the core network device to determine to send the first information to the terminal device through the second access network device.

19. The method according to claim 17 or 18, characterized in that, The second access network device and the first access network device are the same access network device, or the second access network device and the first access network device are different access network devices.

20. The method according to claim 19, wherein When the second access network device and the first access network device are the same access network device, the method further includes: Receiving fifth information from the terminal device, where the fifth information is used to indicate information sent by the core network device in response to the terminal device.

21. A communication method, characterized in that, Applied to a second access network device, it includes: Receiving first information from the core network device, where the first information is information sent by the core network in response to a first request to a terminal device, the first request is used to indicate that the terminal device requests access to the core network, and the first information corresponds to a first terminal device identifier; Upon receiving the first terminal device identifier, sending the first information to the terminal device that sent the first terminal device identifier.

22. The method according to claim 21, wherein The first terminal device identifier is sent by the core network device to the second access network device.

23. A communication device, characterized in that, Includes: A processor, The processor is configured to cause the communication device to implement the method according to any one of claims 1 to 11 by executing a computer program and / or through logic circuits.

24. A communication device, characterized in that, Includes: A processor, The processor is configured to cause the communication device to implement the method according to any one of claims 12 to 16 by executing a computer program and / or through logic circuits.

25. A communication device, characterized in that, Includes: A processor, The processor is configured to cause the communication device to implement the method according to any one of claims 17 to 20 by executing a computer program and / or through logic circuits.

26. A communication system, characterized in that, Includes the communication device according to claim 20 or claim 21 or claim 22.

27. A computer-readable medium, characterized in that, The computer-readable medium stores program code for computer execution, and the program code includes instructions for executing the method according to any one of claims 1 to 11 or 12 to 16 or 17 to 20.

28. A computer program product, characterized in that, The computer program product includes computer program code which, when run on a computer, causes the computer to implement the method according to any one of claims 1 to 11 or 12 to 16 or 17 to 20.

29. A chip, characterized in that, It includes at least one processor and a communication interface. The communication interface and the at least one processor are interconnected by a line. The at least one processor is configured to run a computer program or instructions to perform the communication method according to any one of claims 1 to 11 or 12 to 16 or 17 to 20.

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