Communication method and device, terminal, access network equipment and core network equipment

Abstract

The embodiment of the invention provides a communication method and device, a terminal, access network equipment and core network equipment. The method comprises the following steps: sending a first request message to a first access network device; wherein the first request message comprises corresponding tendency indication information used for indicating access to the first access network equipment or access to the second access network equipment, the terminal equipment resides in the first access network equipment, and the coverage range of the first access network equipment is larger than that of the second access network equipment. According to the invention, frequent mobility management of the terminal equipment can be reduced.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communication technologies, and in particular, to a communication method, apparatus, terminal, access network device, and core network device. Background Art

[0002] The coverage ranges of different access network devices are different. In the scenario where a terminal device is connected to an access network device, an access network device with a small coverage range can provide services with low latency and high data transmission rate for the terminal device. Therefore, the terminal device direct connection service is usually provided by an access network device with a small coverage range.

[0003] Since the terminal device may move relative to the access network device, when the terminal device moves out of the coverage area of the current access network device and enters the coverage area of the next access network device, the terminal device needs to perform cell reselection. Moreover, the access network device with low latency and high data transmission rate has a small coverage range, and the terminal device may need to perform wireless measurements and reselect cells frequently, resulting in frequent mobility management of the terminal device and consuming a large amount of power. Summary of the Invention

[0004] The embodiments of the present application provide a communication method, apparatus, terminal, access network device, and core network device to solve the problem of frequent mobility management of the terminal device.

[0005] In a first aspect, the embodiments of the present application provide a communication method applied to a terminal device, and the method includes:

[0006] Sending a first request message to a first access network device; wherein, the first request message includes tendency indication information for indicating accessing the first access network device or accessing a second access network device, the terminal device camps on the first access network device, and the coverage range of the first access network device is larger than that of the second access network device.

[0007] In some embodiments, the method further includes: receiving a first response message sent by the first access network device; and establishing a connection with the first access network device or the second access network device according to the first response message.

[0008] In some embodiments, the first request message further includes at least one of the following: an identifier of the terminal device; a reason for establishing a connection; or location information of the terminal device.

[0009] In some embodiments, the tendency indication information is used to indicate one of the following: preferentially using the second access network device to provide services; the second access network device provides services; the first access network device provides services.

[0010] In some embodiments, the first response message is a Radio Resource Control (RRC) rejection message; the first response message includes at least one of the following: redirection carrier information; or, ephemeris information of the second access network device.

[0011] In some embodiments, the first response message is an RRC establishment message; the first response message includes at least one of the following: redirection carrier information; ephemeris information of the second access network device;

[0012] RRC configuration information of the second access network device; system information of the second access network device; or, resource scheduling information of the second access network device.

[0013] In some embodiments, the redirection carrier information includes any one of the following: New Radio (NR) carrier information; or, Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

[0014] In a second aspect, an embodiment of the present application provides a communication method applied to a first access network device. The method includes:

[0015] Receiving a first request message sent by a terminal device;

[0016] Sending a first response message to the terminal device; wherein, the first response message is used to instruct the terminal device to establish a connection with the first access network device or the second access network device, the terminal device camps on the first access network device, and the coverage range of the first access network device is greater than the coverage range of the second access network device.

[0017] In some embodiments, the method further includes: receiving a paging indication message sent by a first core network device, the paging indication message includes tendency indication information for instructing to access the second access network device or the first access network device, and the first response message is determined based on the tendency indication information included in the paging indication message.

[0018] In some embodiments, the method further includes: receiving a paging indication message sent by a first core network device, the paging indication message includes tendency indication information for instructing to access the second access network device or the first access network device. In some embodiments, the first request message includes tendency indication information for instructing to access the first access network device or the second access network device, and the first response message is determined based on the tendency indication information included in the first request message.

[0019] In some embodiments, the first request message further includes at least one of the following: an identifier of the terminal device; a reason for establishing a connection; or, location information of the terminal device.

[0020] In some embodiments, the tendency indication information is used to indicate one of the following: preferentially use the second access network device to provide services; the second access network device provides services; the first access network device provides services.

[0021] In some embodiments, the tendency indication information is used to indicate preferentially using the second access network device to provide services;

[0022] The first response message is a Radio Resource Control (RRC) rejection message or an RRC establishment message. The RRC rejection message indicates that the second access network device provides services, and the RRC establishment message includes the RRC configuration information of the first access network device or the RRC configuration information of the second access network device. In some embodiments, the RRC rejection message or the RRC establishment message including the RRC configuration information of the second access network device includes at least one of the following: redirection carrier information; or, the ephemeris information of the second access network device.

[0023] In some embodiments, the tendency indication information is used to indicate that the second access network device provides services; the first response message is an RRC rejection message, or, the RRC establishment message; wherein, the RRC rejection message indicates that the second access network device provides services or indicates rejection of connection establishment, and the RRC establishment message includes the RRC configuration information of the second access network device.

[0024] In some embodiments, the tendency indication information is used to indicate preferentially using the second access network device to provide services or the tendency indication information is used to indicate that the second access network device provides services;

[0025] In the case where there is an inter-satellite link failure between the first access network device and the second access network device, or in the case where the first access network device has a first core network device and the second access network device has a second core network device, the first response message is an RRC rejection message, and the RRC rejection message indicates that the second access network device provides services.

[0026] In some embodiments, the RRC rejection message includes at least one of the following: redirection carrier information; or, the ephemeris information of the second access network device.

[0027] In some embodiments, the RRC establishment message includes at least one of the following: redirection carrier information and the RRC configuration information of the second access network device.

[0028] In some embodiments, the RRC establishment message further includes at least one of the following: ephemeris information of the second access network device; RRC configuration information of the second access network device; system information of the second access network device; or resource scheduling information of the second access network device.

[0029] In some embodiments, the redirected carrier information includes any one of the following: New Radio (NR) carrier information; or Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

[0030] In some embodiments, the preference indication information is used to indicate that the first access network device provides services; the first response message is an RRC establishment message, the RRC establishment message indicates that the first access network device provides services, and the RRC establishment message includes the RRC configuration information of the first access network device.

[0031] In some embodiments, the method further includes: sending a second request message to a second access network device, where the second request message is used to indicate that the terminal device requests to access the second access network device;

[0032] Receiving a second response message sent by the second access network device, where the second response message includes the RRC configuration information of the second access network device.

[0033] In some embodiments, the method further includes: in the case of not receiving the second response message within a predetermined time, sending a first response message to the terminal device, where the first response message is an RRC rejection message, and the first response message includes at least one of the following: redirected carrier information; or ephemeris information of the second access network device. In some embodiments, the second request message includes at least one of the following: an identifier of the terminal device; or an identifier of the second access network device.

[0034] In some embodiments, the second response message further includes at least one of the following: an identifier of the terminal device; redirected carrier information; system information of the second access network device; resource scheduling information of the second access network device; or ephemeris information of the second access network device.

[0035] In some embodiments, the method further includes: sending a third request message to a first core network device, where the third request message is used to indicate that the terminal device needs to access the second access network device;

[0036] Receiving a third response message sent by the first core network device, where the third response message includes the RRC configuration information of the second access network device.

[0037] In some embodiments, the method further includes: in the case that the third response message is not received within a predetermined time, sending a first response message to the terminal device, where the first response message is an RRC rejection message, and the first response message includes at least one of the following: redirection carrier information; or, ephemeris information of the second access network device.

[0038] In some embodiments, the third request message includes at least one of the following: an identifier of the terminal device; first information; or, location information of the terminal device; where the first information is used to indicate that the second access network device provides services for the terminal device.

[0039] In some embodiments, the third response message further includes at least one of the following: an identifier of the terminal device; redirection carrier information; an identifier of the second access network device; system information of the second access network device; resource scheduling information of the second access network device; or, ephemeris information of the second access network device.

[0040] In a third aspect, an embodiment of the present application provides a communication method, which is applied to a second access network device, and the method includes:

[0041] Receiving a connection completion message sent by a terminal device;

[0042] Establishing a connection with the terminal device according to the connection completion message; where the terminal device camps on a first access network device, and the coverage range of the first access network device is larger than the coverage range of the second access network device.

[0043] In some embodiments, the connection completion message is an RRC establishment completion message.

[0044] In some embodiments, before receiving the connection completion message sent by the terminal device, the method further includes:

[0045] Receiving a second request message sent by the first access network device, where the second request message is used to indicate that the terminal device requests to access the second access network device;

[0046] Sending a second response message to the first access network device, where the second response message includes RRC configuration information of the second access network device.

[0047] In some embodiments, the second request message includes at least one of the following: an identifier of the terminal device; or, an identifier of the second access network device.

[0048] In some embodiments, when the first access network device does not receive the second response message within a predetermined time, it sends a first response message to the terminal device. The first response message is an RRC rejection message, and the first response message includes at least one of the following: redirection carrier information; or, ephemeris information of the second access network device. In some embodiments, the second response message further includes at least one of the following: an identifier of the terminal device; redirection carrier information; system information of the second access network device; resource scheduling information of the second access network device; or, ephemeris information of the second access network device.

[0049] In some embodiments, before receiving the connection completion message sent by the terminal device, the method further includes:

[0050] Receiving a fourth request message sent by a second core network device, where the fourth request information is used to indicate that the terminal device requests to access the second access network device;

[0051] Sending a fourth response message to the second core network device, where the fourth response message includes RRC configuration information of the second access network device.

[0052] In some embodiments, the fourth request message includes at least one of the following: an identifier of the terminal device; or, location information of the terminal device.

[0053] In some embodiments, the fourth response message includes at least one of the following: an identifier of the terminal device; an identifier of the second access network device; system information of the second access network device; resource scheduling information of the second access network device; ephemeris information of the second access network device; or, redirection carrier information.

[0054] In some embodiments, the redirection carrier information includes any one of the following: New Radio (NR) carrier information; or, Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

[0055] Fourthly, an embodiment of the present application provides a communication method applied to a first core network device. The method includes:

[0056] Receiving a third request message sent by a first access network device, where the third request message is used to indicate that a terminal device needs to access the second access network device;

[0057] Sending a fifth request message to a second core network device, where the fifth request message is used to indicate a request to create a context of the terminal device;

[0058] Receiving a fifth response message sent by the second core network device, where the fifth response message is a response to the fifth request message;

[0059] Among them, the terminal device camps on the first access network device, and the coverage range of the first access network device is larger than that of the second access network device.

[0060] In some embodiments, the third request message includes at least one of the following: an identifier of the terminal device; first information; or location information of the terminal device, where the first information is used to indicate that the second access network device provides services.

[0061] In some embodiments, the fifth request message includes at least one of the following: an identifier of the terminal device; first information; or location information of the terminal device, where the first information is used to indicate that the second access network device provides services.

[0062] In some embodiments, the fifth response message includes at least one of the following: an identifier of the terminal device; an identifier of the second access network device; radio resource control (RRC) configuration information of the second access network device; system information of the second access network device; resource scheduling information of the second access network device; ephemeris information of the second access network device; or redirection carrier information.

[0063] In some embodiments, the redirection carrier information includes any one of the following: New Radio (NR) carrier information; or Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

[0064] In some embodiments, after receiving the fifth response message sent by the second core network device, the method further includes:

[0065] Sending a third response message to the second access network device, where the third response message includes redirection carrier information and RRC configuration information of the second access network device.

[0066] In some embodiments, the third response message further includes at least one of the following: an identifier of the terminal device; an identifier of the second access network device; system information of the second access network device; resource scheduling information of the second access network device; or ephemeris information of the second access network device.

[0067] In some embodiments, the method further includes: sending a paging message to the first access network device, where the paging message is used to indicate that there is pending traffic for the terminal device.

[0068] In some embodiments, the paging message includes tendency indication information.

[0069] In some embodiments, the tendency indication information is used to indicate at least one of the following: preferentially using the second access network device to provide services; the second access network device providing services; the first access network device providing services.

[0070] In a fifth aspect, an embodiment of the present application provides a communication method, which is applied to a second core network device. The method includes:

[0071] Receiving a fifth request message sent by a first core network device, where the fifth request message is used to indicate a request to create a context of a terminal device;

[0072] Sending a fifth response message to the first core network device, where the fifth response message is a response to the fifth request message; wherein, the terminal device camps on the first access network device, and the coverage range of the first access network device is greater than the coverage range of the second access network device.

[0073] In some embodiments, before sending the fifth response message to the first core network device, the method further includes:

[0074] Sending a fourth request message to a second access network device;

[0075] Receiving a fourth response message sent by the second access network device, where the fourth response message includes RRC configuration information of the second access network device.

[0076] In some embodiments, the fifth request message includes at least one of the following: an identifier of the terminal device; first information; or, location information of the terminal device, where the first information is used to indicate that the second access network device provides services.

[0077] In some embodiments, the fourth response message includes at least one of the following: an identifier of the terminal device; an identifier of the second access network device; radio resource control (RRC) configuration information of the second access network device; system information of the second access network device; resource scheduling information of the second access network device; ephemeris information of the second access network device; or, redirected carrier information.

[0078] In some embodiments, the fourth request message includes at least one of the following: an identifier of the terminal device; or, an identifier of the second access network device.

[0079] In some embodiments, the fifth response message includes at least one of the following: an identifier of the terminal device; RRC configuration information of the second access network device; system information of the second access network device; resource scheduling information of the second access network device; ephemeris information of the second access network device; or, redirected carrier information.

[0080] In some embodiments, the redirected carrier information includes any one of the following: New Radio (NR) carrier information; or, Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

[0081] In a sixth aspect, an embodiment of the present application provides a communication device applied to a terminal device. The device includes:

[0082] A sending module, configured to send a first request message to a first access network device; wherein, the first request message includes tendency indication information for indicating access to the first access network device or access to a second access network device. The terminal device camps on the first access network device, and the coverage range of the first access network device is greater than that of the second access network device.

[0083] In a seventh aspect, an embodiment of the present application provides a communication device applied to a first access network device. The device includes:

[0084] A receiving module, configured to receive the first request message sent by the terminal device;

[0085] A sending module, configured to send a first response message to the terminal device; wherein, the first response message is used to indicate that the terminal device establishes a connection with the first access network device or the second access network device. The terminal device camps on the first access network device, and the coverage range of the first access network device is greater than that of the second access network device.

[0086] In an eighth aspect, an embodiment of the present application provides a communication device applied to a second access network device. The device includes:

[0087] A receiving module, configured to receive a connection completion message sent by the terminal device;

[0088] A processing module, configured to establish a connection with the terminal device according to the connection completion message; wherein, the terminal device camps on the first access network device, and the coverage range of the first access network device is greater than that of the second access network device.

[0089] In a ninth aspect, an embodiment of the present application provides a communication device applied to a first core network device. The device includes:

[0090] A receiving module, configured to receive a third request message sent by the first access network device, where the third request message is used to indicate that the terminal device needs to access the second access network device;

[0091] A sending module, configured to send a fifth request message to a second core network device, where the fifth request message is used to indicate a request to create a context for the terminal device;

[0092] The receiving module is further configured to receive a fifth response message sent by the second core network device, where the fifth response message is a response to the fifth request message; wherein, the terminal device camps on the first access network device, and the coverage range of the first access network device is greater than that of the second access network device.

[0093] In a tenth aspect, an embodiment of the present application provides a communication device applied to a second core network device. The device includes:

[0094] A receiving module, configured to receive a fifth request message sent by a first core network device, where the fifth request message is used to indicate a request to create a context of a terminal device;

[0095] A sending module, configured to send a fifth response message to the first core network device, where the fifth response message is a response to the fifth request message; wherein, the terminal device camps on the first access network device, and the coverage range of the first access network device is greater than that of the second access network device.

[0096] In an eleventh aspect, an embodiment of the present application provides a terminal device, including:

[0097] At least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method described in the first aspect.

[0098] In a twelfth aspect, an embodiment of the present application provides an access network device, including:

[0099] At least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method described in the second aspect or the third aspect.

[0100] In a thirteenth aspect, an embodiment of the present application provides a core network device, including:

[0101] At least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method described in the fourth aspect or the fifth aspect.

[0102] In a fourteenth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer execution instructions, and when the computer execution instructions are executed by a processor, they are used to implement the method described in any of the first to fifth aspects.

[0103] In a fifteenth aspect, an embodiment of the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the method described in any of the first to fifth aspects.

[0104] In a sixteenth aspect, the present application provides a chip having a computer program stored thereon, and when the computer program is executed by the chip, the method as described in any aspect from the first aspect to the fifth aspect is implemented.

[0105] In the seventeenth aspect, the present application provides a chip module having a computer program stored thereon, and when the computer program is executed by the chip module, the method as described in any one of the first to fifth aspects is implemented.

[0106] The communication method, apparatus, terminal, access network equipment and core network equipment provided in the embodiments of the present application enable the terminal equipment to reside in a first access network equipment with a large coverage area when in an idle state, so as to reduce the mobility management of the terminal equipment. When the terminal equipment needs to initiate a service, the second access network equipment with a small coverage area or the first access network equipment can be selected according to the preference indication information to provide services for the terminal equipment, thereby ensuring the service quality of the service. BRIEF DESCRIPTION OF THE DRAWINGS

[0107] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0108] Figure 1 is a structural diagram of a communication system shown in an embodiment of the present application;

[0109] Figure 2 It is a flow chart of a communication method shown in an embodiment of the present application;

[0110] Figure 3 is a flow chart of a communication method according to another embodiment of the present application;

[0111] Figure 4 is a flow chart of a communication method according to another embodiment of the present application;

[0112] Figure 5 is a flow chart of a communication method according to another embodiment of the present application;

[0113] Figure 6It is a schematic flowchart of a communication method shown in another embodiment of the present application;

[0114] Figure 7 It is a schematic flowchart of a communication method shown in another embodiment of the present application;

[0115] Figure 8 It is a schematic flowchart of a communication method shown in another embodiment of the present application;

[0116] Figure 9 It is a schematic flowchart of a communication method shown in another embodiment of the present application;

[0117] Figure 10 It is a schematic block diagram of a communication device shown in an embodiment of the present application;

[0118] Figure 11 It is a schematic block diagram of a communication device shown in another embodiment of the present application

[0119] Figure 12 It is a schematic block diagram of a communication device shown in another embodiment of the present application;

[0120] Figure 13 It is a schematic block diagram of a communication device shown in another embodiment of the present application;

[0121] Figure 14 It is a schematic block diagram of a communication device shown in another embodiment of the present application;

[0122] Figure 15 It is a schematic block diagram of a communication device shown in an embodiment of the present application.

[0123] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed Description of the Embodiments

[0124] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0125] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0126] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0127] For terminal devices, access network devices with a large coverage area will lead to less mobility management of terminal devices, but the service quality of services such as the number of delayed transmissions will be reduced; while access network devices with a small coverage area will lead to more mobility management of terminal devices, but the service quality of services such as the number of delayed transmissions of terminal devices can be guaranteed.

[0128] When a terminal device accesses an access network device with a small coverage area, due to the small coverage area and the fact that the terminal device and the access network device may be in relative motion, the terminal device needs to frequently perform cell reselection, that is, the terminal device needs to frequently perform wireless measurements. Both measurement and reselection behaviors will cause the terminal device to consume a large amount of power and reduce the battery life of the terminal device.

[0129] Based on this, a communication method, apparatus, terminal, access network equipment and core network equipment are provided in the embodiments of the present application. When the terminal equipment is in an idle state, it resides in a first access network equipment with a large coverage area to reduce the mobility management of the terminal equipment, reduce the power consumption of the terminal equipment, and improve the battery life of the terminal equipment; and when the terminal equipment needs to initiate a service, it can select a second access network equipment with a small coverage area or the first access network equipment to provide services to the terminal equipment according to the tendency indication information, so as to ensure the service quality of the service.

[0130] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication systems, future 5th Generation (5G) communication systems, possible 6th generation and 7th generation communication systems, or new radio Access Technology (NR) satellite bandwidth communication systems, Device-to-Device (D2D) systems, vehicle-to-X (V2X) systems, Internet of Vessels, etc. Among them, V2X can include vehicle to network (V2N), vehicle to vehicle (V2V), vehicle to infrastructure (V2I), vehicle to pedestrian (V2P), etc., Long Term Evolution-Vehicle (LTE-V), Internet of Vehicles, machine type communication (MTC), Internet of Things (IoT), Long Term Evolution-Machine (LTE-M), Machine to Machine (M2M), etc.

[0131] To facilitate the understanding of the embodiments of the present application, first, in combination with Figure 1 a detailed description of the communication system applicable to the embodiments of the present application is provided. As Figure 1 shown, the communication system 100 may include at least one access network device, such as Figure 1 the access network device 110 shown, and may also include a core network device, such as Figure 1 the core network device 120 in Figure 1The terminal device 130 shown. Among them, the terminal device 130 can be mobile or fixed. The access network device 110 is a device that can communicate with the terminal device 130 through a wireless link, such as a base station, a wireless access controller (Access Controller), etc. Each access network device can provide communication coverage for a specific geographical area and can communicate with the terminal device 130 located within the coverage area (cell).

[0132] In some embodiments, the core network device 120 is a functional network element in the core network, such as a policy control function network element, which corresponds to the policy control function network element (Policy Control Function, PCF) in the 5G core network, or a mobility management network element, which corresponds to the access and mobility management function network element (Access and Mobility Management Function, AMF) in the 5G core network, etc. There is no specific limitation here. It can be understood that the network element of the core network can also be a network element corresponding to the corresponding function in the 4G (Fourth Generation Mobile Communication Technology) core network, or a network element corresponding to the corresponding function in the 6G (Sixth Generation Mobile Communication Technology) core network. There is no specific limitation here either.

[0133] The access network device 110 in the embodiments of the present disclosure is an entity on the network side for transmitting or receiving signals, and the network device can be called a network side device. For example, the access network device 110 can be an evolved NodeB (eNB), a transmission reception point (TRP), a next generation NodeB (gNB) in the NR system, a base station in other future mobile communication systems, or an access node in a wireless fidelity (WiFi) system, etc. The embodiments of the present disclosure do not limit the specific technologies and specific device forms adopted by the network device.

[0134] The access network device 110 provided in the embodiments of the present disclosure can also be composed of a central unit (CU) and a distributed unit (DU). Among them, the CU can also be called a control unit (control unit). Adopting the CU-DU structure can split the protocol layer of the network device, such as a base station. The functions of some protocol layers are centrally controlled by the CU, and the functions of the remaining part or all protocol layers are distributed in the DU, and the DU is centrally controlled by the CU.

[0135] In some embodiments, the access network device 110 is a network device, which can include a non-terrestrial network device, such as a satellite, which can be regarded as a mobile network device. There is no specific limitation here.

[0136] The terminal device 130 in the embodiments of the present disclosure is an entity on the user side for receiving or transmitting signals, such as a mobile phone. The terminal device can also be referred to as a terminal, a user equipment (UE), a mobile station (MS), a mobile terminal (MT), a user-side device, etc. The terminal can be an automobile with communication functions, a smart car, a mobile phone, a wearable device, a tablet computer (Pad), a computer with wireless transceiver functions, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc.

[0137] In some embodiments, the terminal device 130 supports Non-Terrestrial Network (NTN) connection.

[0138] In some embodiments, the terminal device 130 is stationed in the access network device 110, such as being stationed in the network where the access network device 110 is located, and the terminal device 130 is in an idle state.

[0139] In other embodiments, the terminal device 130 can access the access network device 110 for service transmission.

[0140] It can be understood that Figure 1 shows the structure of a network system. The embodiments of the present disclosure do not limit the specific technologies and specific device forms adopted by the terminal device / access network device / core network device.

[0141] It can be understood that the communication system described in the embodiments of the present disclosure is to more clearly illustrate the technical solutions of the embodiments of the present disclosure, and does not constitute a limitation on the technical solutions provided by the embodiments of the present disclosure. Those of ordinary skill in the art know that with the evolution of the system architecture and the emergence of new service scenarios, the technical solutions provided by the embodiments of the present disclosure are equally applicable to similar technical problems.

[0142] To facilitate the understanding of the embodiments of the present application, the terms involved in the present application are briefly described first.

[0143] Cell: A cell is described by a higher layer from the perspective of resource management, mobility management, or service unit. The coverage area of each network device can be divided into one or more cells, and each cell can correspond to one or more frequency points. Or rather, each cell can be regarded as an area formed by the coverage ranges of one or more frequency points.

[0144] Radio Resource Control (RRC) connection: Before normal communication, the terminal device can establish an RRC connection with the network device, or rather, an RRC connection with the cell. When the RRC connection is disconnected, the terminal device cannot communicate normally.

[0145] It can be understood that in the embodiments of the present application, "for indicating" can include direct indication and indirect indication, and can also include explicit indication and implicit indication. If the information indicated by a certain piece of information is called the information to be indicated, then in the specific implementation process, there are many ways to indicate the information to be indicated. For example, but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the index of the information to be indicated, etc. It is also possible to indirectly indicate the information to be indicated by indicating other information, where there is an association relationship between the other information and the information to be indicated. It is also possible to only indicate a part of the information to be indicated, while the other parts of the information to be indicated are known or pre-agreed. For example, it is also possible to implement the indication of the information to be indicated by relying on whether a certain cell exists in a pre-agreement (such as protocol regulations), so as to reduce the indication overhead to a certain extent.

[0146] It can be understood that in the embodiments shown below, the first, second, and various numerical numbers are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. For example, to distinguish different indication information, different time intervals, etc.

[0147] It can be understood that the "preset value" can be implemented by pre-saving corresponding codes, tables, or other ways that can be used to indicate relevant information in a device (for example, including a terminal device and a network device). The present application does not limit its specific implementation method. Among them, "saving" can mean saving in one or more memories. One or more memories can be set separately, or can be integrated in an encoder or decoder, a processor, or a communication device. One or more memories can also be partially set separately and partially integrated in a decoder, a processor, or a communication device. The type of memory can be any form of storage medium, and the present application does not limit this.

[0148] It can be understood that the "protocol" involved in the embodiments of the present application may refer to standard protocols in the communication field. For example, it may include LTE protocols, NR protocols, and related protocols applied to future communication systems. The present application does not make any limitations in this regard.

[0149] It can be understood that "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects and indicates that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one (item)" or its similar expression refers to any combination of these items, including any combination of single item (item) or plural items (items). For example, at least one (item) of a, b, and c can represent: a, or, b, or, c, or, a and b, or, a and c, or, b and c, or, a, b, and c. Where a, b, and c can be single or multiple respectively.

[0150] It can be understood that in the embodiments of the present application, descriptions such as "when...", "in the case of...", "if", and "when" all refer to that the device (such as a terminal device or a network device) will perform corresponding processing under a certain objective situation, which does not limit the time, and it is not required that the device (such as a terminal device or a network device) must have a judgment action when implementing, nor does it mean that there are other limitations.

[0151] It can be understood that for the convenience of describing the embodiments of the present application, without special explanation, the message names involved are message names in NR. However, it can be understood that these message names are only examples for easy understanding and should not constitute any limitation to the present application. The present application does not exclude the possibility of defining other message names in future protocols to replace the message names listed in the present application to achieve the same or similar functions. In addition, taking the message names in NR as examples to illustrate the embodiments of the present application should not constitute any limitation to the scenarios applicable to the method provided by the present application. For example, "RRC connection recovery" in the following embodiments can be replaced by "RRC re - establishment", "RRC connection re - establishment", etc. For the sake of brevity, they are not listed one by one here.

[0152] It can be understood that the following describes multiple embodiments in detail in combination with multiple flowcharts. However, it should be understood that the relevant descriptions of these flowcharts and their corresponding embodiments are only examples for easy understanding and should not constitute any limitation to the present application. Each step in each flowchart is not necessarily required to be executed. For example, some steps can be skipped. And the execution order of each step is not fixed and unchanged, nor is it limited to that shown in the figure. The execution order of each step should be determined by its function and internal logic.

[0153] The method provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0154] It should be understood that, for the convenience of understanding and description, the following takes the interaction between a terminal device and a network device as an example to describe in detail the method provided by the embodiments of the present application. However, this should not impose any limitation on the execution entity of the method provided by the present application. For example, the terminal device shown in the following embodiments can be replaced by components (such as chips or circuits) configured in the terminal device. The network device shown in the following embodiments can also be replaced by components (such as chips or circuits) configured in the network device.

[0155] The following embodiments do not particularly limit the specific structure of the execution entity of the method provided by the embodiments of the present application. As long as it can communicate according to the method provided by the embodiments of the present application by running a program recorded with the code of the method provided by the embodiments of the present application. For example, the execution entity of the method provided by the embodiments of the present application can be a terminal device or a network device, or a functional module in the terminal device or the network device that can call and execute the program.

[0156] Figure 2 It is a schematic flowchart of a communication method shown in an embodiment of the present application. As Figure 2 shown, the communication method may include step S201 to step S203. The following details Figure 2 each step in.

[0157] S201. The terminal device sends a first request message to the first access network device.

[0158] In some embodiments, the terminal device sends a first request message to the first access network device.

[0159] In some embodiments, the first request message includes tendency indication information for indicating to access the first access network device or the second access network device.

[0160] In some embodiments, the terminal device camps on the first access network device.

[0161] In some embodiments, the terminal device camps in the network where the first access network device is located.

[0162] In some embodiments, the terminal device camps on the first access network device and is in an idle state.

[0163] In some embodiments, the terminal device has services to be processed, and the terminal device needs to establish a connection with the network and sends a first request message to the first access network device.

[0164] It can be understood that the service to be processed can be a service initiated by a terminal device, such as making a video call, on-demand viewing of a TV series, etc.; or the service to be processed can be a service triggered by a terminal device being called or a network-triggered service, such as answering a call, receiving a firmware upgrade program, etc.

[0165] In some embodiments, the first request message is an RRC Setup request message.

[0166] In some embodiments, the first request message is used to instruct the terminal device to request access to the access network device.

[0167] In some embodiments, the coverage range of the first access network device is larger than that of the second access network device.

[0168] In some embodiments, when the terminal resides in the first access network device with a large coverage range, mobility management can be reduced.

[0169] In some embodiments, the first request message further includes at least one of the following: the identifier of the terminal device; the reason for establishing a connection; or the location information of the terminal device.

[0170] In some embodiments, the location information of the terminal device may not be sent through the first request message. After receiving the first request message, the first access network device actively obtains the location information of the terminal device from the terminal device; or obtains it from the first core network device. The terminal device resides in the first access network device, that is, the terminal device is registered in the first access network device and the first core network device, and the location information of the terminal device is stored in the first core network device.

[0171] In some embodiments, the preference indication information is used to indicate one of the following: preferentially use the service provided by the second access network device; the service provided by the second access network device; the service provided by the first access network device.

[0172] In some embodiments, the second access network device can be a low-earth orbit type of access network device. For example, the second access network device is a low-earth orbit access network device, or it can be a type with a coverage range smaller than that of the first access network device. No specific limitation is made here.

[0173] In some embodiments, the second access network device is a low-earth orbit satellite and the first access network device is a geostationary orbit satellite.

[0174] In some embodiments, the preference indication information includes a first field, and different values of the first field correspond to different information for indication.

[0175] In some embodiments, the preference indication information does not include a first field. When the preference indication information does not include the first field, the preference indication information is used to indicate that the first access network device provides services.

[0176] In some embodiments, the preference indication information includes a first field, and the value of the first field is a first preset value. The preference indication information is used to indicate that the first access network device provides services.

[0177] That the first access network device provides services means that the terminal device hopes that the first access network device provides services to the terminal device.

[0178] In some embodiments, the preference indication information includes a first field, and the value of the first field is a second preset value. The preference indication information is used to indicate preferentially using the second access network device to provide services.

[0179] That preferentially using the second access network device to provide services means that the terminal device hopes to preferentially select the second access network device to provide services to the terminal device. If there is no second access network device available to provide services to the terminal device, the first access network device can be selected to provide services to the terminal device.

[0180] In some embodiments, the preference indication information includes a first field, and the value of the first field is a third preset value. The preference indication information is used to indicate that the second access network device provides services.

[0181] The preference indication information used to indicate that the second access network device provides services means that the terminal device designates the second access network device to provide services to the terminal device. If there is no second access network device, the terminal device does not establish a connection with the first access network device nor with the second access network device.

[0182] In some embodiments, the first preset value, the second preset value, and the third preset value can be preset in advance. The first preset value, the second preset value, and the third preset value can be any character, number, or string, etc., and the values of the first preset value, the second preset value, and the third preset value are different.

[0183] For example, in one embodiment, the first preset value is "0", the second preset value is "1", and the third preset value is "2". Of course, the first preset value, the second preset value, and the third preset value can also be other values, and no specific limitation is made here.

[0184] S202. The first access network device sends a first response message to the terminal device.

[0185] In some embodiments, the first access network device receives the first request message and determines the access network device required by the terminal device according to the preference indication information in the first request message.

[0186] In some embodiments, the preference indication information is used to indicate that the first access network device provides services, and the first response message sent by the first access network device to the terminal device is an RRC Setup (RRC establishment) message.

[0187] In some embodiments, the preference indication information is used to indicate that the second access network device is preferentially used to provide services. The first access network device selects the second access network device according to the location information of the terminal device and the ephemeris information of the second access network device. If there is a second access network device that supports the access of the terminal device, the first response message is an RRC Reject (RRC rejection) message, which is used to indicate to the terminal device that the second access network device provides services for the terminal device, that is, the terminal device can subsequently access the second access network device and establish a connection with the second access network device.

[0188] In some embodiments, the preference indication information is used to indicate that the second access network device is preferentially used to provide services. The first access network device selects the second access network device according to the location information of the terminal device and the ephemeris information of the second access network device. If there is no second access network device that supports the access of the terminal device, the first response message is an RRC Setup message, which is used to indicate to the terminal device that the first access network device provides services for the terminal device, that is, the terminal device can subsequently access the first access network device and establish a connection with the first access network device. For example, after receiving the RRC Setup message, the terminal device sends an RRC Setup Complete (RRC establishment complete) message to the first access network device, and the terminal device establishes a connection with the first access network device.

[0189] In some embodiments, the preference indication information is used to indicate that the second access network device provides services. The first access network device selects the second access network device according to the location information of the terminal device and the ephemeris information of the second access network device. If there is a second access network device that supports the access of the terminal device, the first response message is an RRC Reject message, which is used to indicate to the terminal device that the second access network device provides services for the terminal device, that is, the terminal device can subsequently access the second access network device and establish a connection with the second access network device.

[0190] In some embodiments, the preference indication information is used to indicate that the second access network device provides services. The first access network device selects the second access network device according to the location information of the terminal device and the ephemeris information of the second access network device. If there is no second access network device that supports the access of the terminal device, the first response message is an RRC Reject message, which is used to indicate to the terminal device the rejection of connection establishment.

[0191] That is, in some embodiments, when the first response message is an RRC Reject message, if the tendency indication information is used to indicate that the second access network device provides services or the tendency indication information is used to indicate preferentially using the second access network device to provide services, and the first access network device determines that there is a second access network device, then the RRC Reject message indicates that the second access network device provides services; and if the tendency indication information is used to indicate that the second access network device provides services, and the first access network device determines that there is no second access network device, then the RRC Reject message indicates rejecting the connection establishment.

[0192] In some embodiments, when the first response message is an RRC Setup message, if the tendency indication information is used to indicate preferentially using the second access network device to provide services, and the first access network device determines that there is no second access network device, then the RRC Setup message indicates that the first access network provides services; if the tendency indication information is used to indicate preferentially using the second access network device to provide services, and the first access network device determines that there is a second access network device, then the RRC Setup message indicates that the second access network provides services; if the tendency indication information is used to indicate that the first access network device provides services, then the RRC Setup message indicates that the first access network provides services.

[0193] When the RRC Setup message indicates that the first access network provides services, the RRC Setup message includes the RRC configuration information of the first access network device.

[0194] In some embodiments, the ephemeris information of the second access network device can be provided to the high-orbit satellite by the server or by the operation and control center, or pre-set in the storage unit of the first access network device.

[0195] In some embodiments, the first request message does not include tendency indication information. The first access network device can determine the tendency indication information according to the paging indication message sent by the first core network device to obtain the corresponding first response message, that is, the first response message is determined based on the tendency indication information included in the paging indication message, and the first response message can determine whether the terminal device accesses the first access network device or the second access network device.

[0196] In some embodiments, the first request message includes tendency indication information, and the first access network device also receives the paging indication message sent by the first core network device, and the paging indication message includes the tendency indication information used to indicate accessing the second access network device or accessing the first access network device. At this time, the first access network device takes the tendency indication information included in the first request message as the criterion to determine the access network device required by the terminal device, that is, the first response message is determined based on the tendency indication information included in the first request message.

[0197] In some embodiments, the first request message includes tendency indication information. The first access network device does not receive the paging indication message sent by the first core network device, or the paging indication message does not include the tendency indication information for indicating access to the second access network device or access to the first access network device. At this time, the first access network device determines the access network device required by the terminal device based on the tendency indication information included in the first request message, that is, the first response message is determined based on the tendency indication information included in the first request message.

[0198] In some embodiments, the first core network device determines that there is a service for the terminal. The first core network device determines the service type and QoS (Quality of Service) requirements of the terminal, and determines whether the terminal accesses the first access network or the second access network according to the service type and QoS requirements, so as to obtain the tendency indication information, and sends a paging indication message to the first access network. The paging indication message carries the tendency indication information, so that the first access network device can determine whether the terminal accesses the first access network or the second access network according to the tendency indication information and the location information of the terminal.

[0199] The paging indication message indicates that there is a service for the terminal device.

[0200] The first core network device is a core network device for mobility management of the first access network device.

[0201] In some embodiments, the first core network device is an Access and Mobility Management Function (AMF).

[0202] In some embodiments, the first core network device is a Mobility Management Entity (MME).

[0203] It can be understood that the first core network device may also be a core network device for mobility management in other communication technologies, which is not specifically limited here.

[0204] In some embodiments, the first response message is an RRC Reject message, and when there is a second access network device that supports the access of the terminal device, the first response message includes at least one of the following: redirection carrier information; or, ephemeris information of the second access network device.

[0205] In some embodiments, the first response message is an RRC Reject message, and there is a second access network device that supports the access of the terminal device. The first response message includes redirected carrier information (Redirected Carrier Info), which is used for the terminal device to quickly access the second access network device and improve the speed of establishing a connection between the terminal device and the second access network device.

[0206] In some embodiments, the redirected carrier information includes any one of the following: NR carrier information; or, EUTRA carrier information.

[0207] In some embodiments, the NR carrier information (Carrier Info NR) includes carrier frequency (Carrier Freq), synchronization signal block (Synchronization Signal Block, SSB) subcarrier spacing information (SSB SubcarrierSpacing).

[0208] In some embodiments, the NR carrier information may further include SSB measurement timing configuration information (smtc).

[0209] In some embodiments, the EUTRA carrier information (Redirected Carrier Info-EUTRA) includes radio frequency frequency point information, such as eutra Frequency information, which is used to index the number of radio frequency frequency points.

[0210] In some embodiments, the EUTRA carrier information further includes core network type information (cnType), which is used to indicate the core network type of the second access network device to which the terminal device is connected.

[0211] In some embodiments, the redirected carrier information is carried by the first response message to enable the terminal device to quickly access the second access network device.

[0212] In some embodiments, when the second access network device is a satellite, the first response message may include ephemeris information of the second access network device.

[0213] In some embodiments, the ephemeris information of the second access network device may be ephemeris information provided in the format of position velocity vector or orbital parameters.

[0214] It can be understood that in some embodiments, the first response message is an RRC Reject message, and there is no second access network device that supports the access of the terminal device. That is, the tendency indication information is used to indicate that the second access network device provides services, and the first access network device determines that there is no second access network device that supports the access of the terminal device. At this time, the first access network device sends the RRC Reject message without carrying redirection carrier information; or, the ephemeris information of the second access network device. At this time, the first response message indicates the rejection of connection establishment, that is, the terminal does not establish a connection with the first access network device nor with the second access network device.

[0215] S203. The terminal device establishes a connection with the second access network device.

[0216] In some embodiments, the first response message is an RRC Reject message, and there is a second access network device that supports the access of the terminal device. The terminal device establishes a connection with the second access network device.

[0217] In some embodiments, the process of the terminal device establishing a connection with the second access network device can refer to the process of the terminal device accessing the access network device. For example, the terminal device sends an RRC Setup Request message to the second access network device, the second access network device sends an RRC Setup message to the terminal device, the terminal device sends an RRC SetupComplete to the second access network device, and the terminal device establishes a connection with the second access network device.

[0218] In some embodiments, S203 is an optional step. After step S202, the terminal device can establish a connection with the first access network device according to the first response message.

[0219] When the first response message is an RRC Setup message and the tendency indication message in the first request message is used to indicate access to the first access network device, the terminal device can send an RRC Setup Complete message to the first access network device, and the terminal device establishes a connection with the first access network device.

[0220] When the first response message is an RRC Reject message and there is no second access network device that supports the access of the terminal device, the terminal device does not establish a connection with the first access network device nor with the second access network device.

[0221] In the embodiments of the present application, when the terminal device is in the idle state, it camps on the first access network device with a large coverage area to reduce the mobility management of the terminal device. Therefore, the terminal device does not need to frequently perform cell reselection, that is, the terminal device does not need to frequently perform radio measurements, reducing the power consumption of the terminal device and ensuring the battery life of the terminal. And when the terminal device needs to initiate a service, it can select the second access network device with a small coverage area according to the preference indication information to provide services for the terminal device, ensuring the service quality of the service. Moreover, the first access network device can quickly match a suitable second access network device for the terminal device through ephemeris information and the location information of the terminal device.

[0222] Figure 3 It is a schematic flowchart of a communication method shown in another embodiment of the present application. As Figure 3 shown, the communication method may include steps S301 to S305. The following details Figure 3 each step in.

[0223] S301. The terminal device sends a first request message to the first access network device.

[0224] In some embodiments, the terminal device sends a first request message to the first access network device.

[0225] In some embodiments, the first request message includes preference indication information for indicating access to the first access network device or access to the second access network device.

[0226] In some embodiments, the terminal device camps in the first access network device and is in the idle state.

[0227] In some embodiments, the terminal device has a service to be processed, and the terminal device needs to establish a connection with the network and sends a first request message to the first access network device.

[0228] In some embodiments, the first request message is an RRC Setup request message.

[0229] In some embodiments, the first request message further includes at least one of the following: the identifier of the terminal device; the reason for establishing the connection; or, the location information of the terminal device.

[0230] It can be understood that the process of the terminal device sending a first request message to the first access network device can refer to the relevant description of step S201, and will not be elaborated here.

[0231] S302. The first access network device sends a second request message to the second access network device.

[0232] In some embodiments, the first access network device and the second access network device perform mobility management under the same core network device. The first access network device may send a second request message to the second access network device, and the second request message is used to instruct the terminal device to request access to the second access network device.

[0233] In some embodiments, the first request message does not include a tendency indication message. The first access network device may determine the tendency indication message according to the paging indication message sent by the first core network device.

[0234] In some embodiments, the first request message includes a tendency indication message, and the first access network device also receives the paging indication message sent by the first core network device, and the paging indication message includes the tendency indication message for instructing to access the second access network device or the first access network device. At this time, the first access network device determines the access network device required by the terminal device based on the tendency indication message included in the first request message, that is, the first response message is determined based on the tendency indication message included in the first request message.

[0235] The paging indication message indicates that there is a service for the terminal device.

[0236] In some embodiments, the first access network device determines whether to send a third request message to the first core network device according to the tendency indication message.

[0237] In some embodiments, if the tendency indication message is used to instruct the first access network device to provide services, the first access network device sends a first response message to the terminal device. The first response message is an RRC Setup message. At this time, steps S302 to S304 are not executed. After receiving the first response message, the terminal device sends an RRC Setup Complete message to the first access network device, and the terminal device establishes a connection with the first access network device.

[0238] In some embodiments, if the tendency indication message is used to indicate that the second access network device is preferentially used to provide services, the first access network device selects the second access network device according to the location information of the terminal device and the ephemeris information of the second access network device. If there is a second access network device that supports the access of the terminal device, the first access network device sends a second request message to the second access network device.

[0239] In some embodiments, the preference indication information is used to indicate preferentially using the second access network device to provide services. The first access network device selects the second access network device according to the location information of the terminal device and the ephemeris information of the second access network device. If there is no first access network device that supports the access of the terminal device, the first access network device sends a first response message to the terminal device, and this first response message is an RRC Setup message. At this time, steps S302 to S304 are not executed. After receiving this first response message, the terminal device sends an RRC Setup Complete message to the first access network device, and the terminal device establishes a connection with the first access network device.

[0240] In some embodiments, the preference indication information is used to indicate that the second access network device provides services. The first access network device selects the second access network device according to the location information of the terminal device and the ephemeris information of the second access network device. If there is a second access network device that supports the access of the terminal device, the first access network device sends a second request message to the second access network device.

[0241] In some embodiments, the preference indication information is used to indicate that the second access network device provides services. The first access network device selects the second access network device according to the location information of the terminal device and the ephemeris information of the second access network device. If there is no second access network device that supports the access of the terminal device, the first access network device sends a first response message to the terminal device, and this first response message is an RRC Reject message, which is used to indicate to the terminal device that the connection establishment is rejected.

[0242] In some embodiments, the second request message may be a UE Access Request (terminal device access request) message.

[0243] In some embodiments, the second request message includes at least one of the following: the identifier of the terminal device; or, the identifier of the second access network device.

[0244] S303. The second access network device sends a second response message to the first access network device.

[0245] In some embodiments, after receiving the second request message, the second access network device performs an initial access decision, such as determining whether to allow the terminal device to access the second access network device according to the load status of the second access network device.

[0246] If the second access network device allows the terminal device to access the second access network device, it sends a second response message to the first access network device.

[0247] If the second access network device does not allow the terminal device to access it, it may send information indicating the rejection of the terminal's access to the second access network device to the first access network. The first access network device sends the information rejecting the terminal's access to the second access network device to the terminal device, and the terminal device does not access the second access network device, that is, steps S303 to S305 of this communication method are not executed.

[0248] In some embodiments, the second response message may be a UE Access request ack (Terminal Device Access Request Confirmation) message.

[0249] In some embodiments, the second response message includes the RRC configuration information of the second access network device.

[0250] In some embodiments, the RRC configuration information of the second access network device is the RRC configuration information configured by the second access network device for the terminal device. Subsequently, the terminal device can perform data transmission with the second access network device based on the RRC configuration information of the second access network device. By carrying the RRC configuration information of the second access network device in the second response message, the rate of the terminal device accessing the second access network device is improved.

[0251] In some embodiments, the RRC configuration information includes cell group configuration information (Cell Group Config), radio bearer configuration (Radio Bearer Config), etc.

[0252] When the RRC Setup message indicates that the first access network provides services, the RRC Setup message includes the RRC configuration information of the first access network device. The RRC configuration information of the first access network device is the RRC configuration information configured by the first access network device for the terminal device. The terminal device can perform data transmission with the first access network device based on the RRC configuration information of the first access network device.

[0253] In some embodiments, the second response message further includes at least one of the following: the identifier of the terminal device; redirection carrier information; the system information of the second access network device; the resource scheduling information of the second access network device; or, the ephemeris information of the second access network device.

[0254] It can be understood that the introduction of the redirection carrier information and the ephemeris information of the second access network device can refer to the relevant descriptions in the above embodiments, and will not be elaborated here.

[0255] The second response message carries the system information of the second access network device. Therefore, the first response message sent by the first access network device to the terminal device may also include the system information of the second access network device. The system information of the second access network device can be used for the terminal device to quickly synchronize with the second access network device, improving the efficiency of the terminal device in obtaining the system information of the second access network device.

[0256] In some embodiments, the resource scheduling information of the second access network device may be a UL grant (uplink grant). The second response message carries the resource scheduling information of the second access network device. Therefore, the first response message sent by the first access network device to the terminal device may also include the resource scheduling information of the second access network device. The terminal device can accurately send a connection completion message according to the resource scheduling information of the second access network device.

[0257] In some embodiments, if the first access network device does not receive the second response message within a predetermined time, it directly sends a first response message to the terminal device. At this time, the first response message is an RRC rejection message, and the RRC rejection message includes at least one of the following: redirection carrier information; or, the ephemeris information of the second access network device. The terminal device can establish a connection with the second access network device through the RRC rejection message.

[0258] In some embodiments, the first access network device sends a second request message to the second access network device. If the second response message is not received within a predetermined time after sending the second request message, it directly sends an RRC rejection message to the terminal device. At this time, there is a second access network device, and the first response message is an RRC rejection message. Then, the RRC rejection message is used to instruct the terminal device to access the second access network device, and the RRC rejection message includes at least one of the following: redirection carrier information; or, the ephemeris information of the second access network device. And the RRC rejection message used to instruct the terminal device to access the second access network device and including redirection carrier information; or, at least one of the ephemeris information of the second access network device can refer to the related implementation manners of steps S202 and S203, which will not be elaborated here.

[0259] In some embodiments, the predetermined time may be pre-configured to avoid the situation that the second network device cannot send the first response message to the terminal device because it has not received the second response message for a long time, resulting in the terminal device being unable to establish a connection with the access network device for a long time and the service cannot be completed.

[0260] S304. The first access network device sends a first response message to the terminal device.

[0261] In some embodiments, the terminal device receives the first response message.

[0262] It can be understood that if the first access network device receives the second response message before the first response message, the first response message may further include the information in the second response message, that is, the first response message includes the RRC configuration information of the second access network device and the redirection carrier information.

[0263] In some embodiments, the first response message may further include at least one of the following: redirection carrier information; ephemeris information of the second access network device; system information of the second access network device; or, resource scheduling information of the second access network device.

[0264] It can be understood that the redirection carrier information in the first response message can be obtained from the redirection carrier information carried in the second response message, or can be the redirection carrier information stored by the first access network device itself.

[0265] In some embodiments, the ephemeris information of the second access network device in the first response message can be obtained from the ephemeris information of the second access network device carried in the second response message, or can be the ephemeris information of the second access network device stored by the first access network device itself.

[0266] The first response message is an RRC setup message, and the first access network device receives the second response message before this first response message. This RRC setup message is used to instruct the second access network device to confirm the access of the terminal device.

[0267] It can be understood that the relevant descriptions of the redirection carrier information and the ephemeris information of the second access network device can refer to the relevant descriptions in step S202, and will not be elaborated here.

[0268] S305. The terminal device sends a connection completion message to the second access network device.

[0269] In some embodiments, the connection completion message is an RRC establishment completion message.

[0270] In some embodiments, the connection completion message is configured and sent to the second access network device through the RRC configuration information of the second access network device and the redirection carrier information in the first response message.

[0271] In some embodiments, when the second access network device receives the connection completion message, it indicates that the terminal device accesses the second access network device, that is, the terminal device establishes a connection with the second access network device.

[0272] In some embodiments, the connection completion message may further carry a Non-Access Stratum (NAS) message, such as a Service Request.

[0273] In some embodiments, the connection completion message is transmitted on a Physical Uplink Shared Channel (PUSCH) scheduled by an uplink grant, or on a predetermined PUSCH. When the connection completion message is transmitted to the second access network device, the second access network device can estimate the timing advance required for the terminal device to access the second access network device. Therefore, the terminal can complete uplink synchronization with the second access network device through the timing advance, so as to accurately send the connection completion message.

[0274] If the second access network device estimates the timing advance, the timing advance can reach the terminal device through the second response message or the first response message.

[0275] In some embodiments, after the terminal device establishes a connection completion service with the second access network device, the terminal device can return to the first access network device and camp on the first access network device.

[0276] In the embodiments of the present application, the terminal device camps on the first access network device with a large coverage area in the idle state to reduce mobility management. Therefore, the terminal device does not need to frequently perform cell reselection, that is, the terminal device does not need to frequently perform radio measurements, reducing the power consumption of the terminal device and ensuring the battery life of the terminal. When the terminal device needs to initiate a service, the second access network device with a small coverage area provides services for the terminal device to ensure the service quality of the service. And in the scenario where the first access network device and the second access network device perform mobility management in the same core network device, through Figure 3 this way, the terminal can quickly access the second access network device, optimize the RRC connection establishment process, and compared with the process of first establishing an RRC connection and then performing a handover, it reduces signaling overhead and reduces latency.

[0277] Figure 4 is a schematic flowchart of a communication method shown in another embodiment of the present application. As Figure 4 shown, the communication method may include steps S401 to S409. The following details Figure 4 each step in.

[0278] S401. The terminal device sends a first request message to the first access network device.

[0279] In some embodiments, the terminal device sends a first request message to the first access network device.

[0280] In some embodiments, the first request message includes tendency indication information for indicating access to the first access network device or access to the second access network device.

[0281] In some embodiments, the terminal device resides in the first access network device and is in an idle state.

[0282] In some embodiments, there is a service to be processed by the terminal device. The terminal device needs to establish a connection with the network and sends a first request message to the first access network device.

[0283] In some embodiments, the first request message is an RRC Setup request message.

[0284] In some embodiments, the first request message further includes at least one of the following: the identifier of the terminal device; the reason for establishing the connection; or, the location information of the terminal device.

[0285] It can be understood that the related implementation manners of the terminal device sending the first request message to the first access network device can refer to the related implementation manners of step S201 and step S301, which will not be elaborated here.

[0286] S402. The first access network device sends a third request message to the first core network device.

[0287] In some embodiments, the first access network device and the second access network device do not perform mobility management under the same core network device.

[0288] In some embodiments, the first core network device performs mobility management on the first access network device, and the second core network device performs mobility management on the second access network device.

[0289] In some embodiments, the first request message does not include a tendency indication message. The first access network device can determine the tendency indication message according to the paging indication message sent by the first core network device.

[0290] In some embodiments, the first request message includes a tendency indication message. The first access network device also receives the paging indication message sent by the first core network device, and the paging indication message includes the tendency indication message for indicating to access the second access network device or the first access network device. At this time, the first access network device determines the access network device required by the terminal device based on the tendency indication message included in the first request message, that is, the first response message is determined based on the tendency indication message included in the first request message.

[0291] The paging indication message indicates that there is a service for the terminal device.

[0292] In some embodiments, the first access network device determines whether to send a third request message to the first core network device according to the tendency indication message.

[0293] In some embodiments, the tendency indication information is used to indicate that the first access network device provides services. Then, the first access network device sends a first response message to the terminal device. The first response message is an RRC Setup message. At this time, steps S402 to S408 are not executed. After receiving the first response message, the terminal device sends an RRC Setup Complete message to the first access network device, and the terminal device establishes a connection with the first access network device.

[0294] In some embodiments, the tendency indication information is used to indicate preferentially using the second access network device to provide services. The first access network device selects the second access network device according to the location information of the terminal device and the ephemeris information of the second access network device. If there is a second access network device that supports the access of the terminal device, the first access network device sends a third request message to the first core network device.

[0295] In some embodiments, the tendency indication information is used to indicate preferentially using the second access network device to provide services. The first access network device selects the second access network device according to the location information of the terminal device and the ephemeris information of the second access network device. If there is no first access network device that supports the access of the terminal device, the first access network device sends a first response message to the terminal device. The first response message is an RRC Setup message. At this time, steps S402 to S408 are not executed. After receiving the first response message, the terminal device sends an RRC Setup Complete message to the first access network device, and the terminal device establishes a connection with the first access network device.

[0296] In some embodiments, the tendency indication information is used to indicate that the second access network device provides services. The first access network device selects the second access network device according to the location information of the terminal device and the ephemeris information of the second access network device. If there is a second access network device that supports the access of the terminal device, the first access network device sends a third request message to the first core network device.

[0297] In some embodiments, the tendency indication information is used to indicate that the second access network device provides services. The first access network device selects the second access network device according to the location information of the terminal device and the ephemeris information of the second access network device. If there is no second access network device that supports the access of the terminal device, the first access network device sends a first response message to the terminal device. The first response message is an RRC Reject message, which is used to indicate to the terminal device that the connection establishment is rejected.

[0298] In some embodiments, the first access network device sends a third request message to the first core network device. The third request message is used to indicate that the terminal device needs to access the second access network device.

[0299] In some embodiments, the third request message is a UE Access required message.

[0300] In some embodiments, the third request message includes at least one of the following: an identifier of the terminal device; first information; or location information of the terminal device; where the first information is used to instruct the second access network device to provide services for the terminal device.

[0301] In some embodiments, the first information includes a second field, and the second field is used to indicate whether it is determined that the second access network device provides services for the terminal device. When the value of the second field is a fourth preset value, it is used to indicate that the second access network device provides services for the terminal device.

[0302] The second field in the first information is the fourth preset value.

[0303] In some embodiments, the fourth preset value may be a number, a character, or a string, and no specific limitation is made here.

[0304] In some embodiments, the fourth preset value may be "1".

[0305] S403. The first core network device sends a fifth request message to the second core network device.

[0306] In some embodiments, when the first core network device receives the third request message and determines that the first information is used to instruct the second access network device to provide services for the terminal device, it sends a fifth request message to the second core network device.

[0307] In some embodiments, the fifth request message is used to indicate a request to create a context for the terminal device.

[0308] In some embodiments, the fifth request message is a Create UE ContextReques message.

[0309] In some embodiments, the fifth request message includes an identifier of the terminal device.

[0310] In some embodiments, the fifth request message includes at least one of the following: an identifier of the terminal device; first information; or location information of the terminal device, and the first information is used to instruct the second access network device to provide services.

[0311] In some embodiments, if the second core network device manages multiple access network devices, the fifth request message may include the first information, which is used to instruct the second core network device to select the second access network device.

[0312] S404. The second core network device sends a fourth request message to the second access network device.

[0313] In some embodiments, the second core network device determines a first access network device according to the location information of the terminal, and sends a fourth request message to the first access network device.

[0314] In some embodiments, the fourth request message is a UE Access Request message.

[0315] In some embodiments, the fourth request message includes at least one of the following: the identifier of the terminal device; or, the location information of the terminal device.

[0316] S405. The second access network device sends a fourth response message to the second core network device.

[0317] In some embodiments, the fourth response message is a UE access request ack message.

[0318] In some embodiments, the fourth response message includes at least one of the following: the identifier of the terminal device; the identifier of the second access network device; the radio resource control (RRC) configuration information of the second access network device; the system information of the second access network device; the resource scheduling information of the second access network device; the ephemeris information of the second access network device; or, the redirected carrier information.

[0319] In some embodiments, the fourth response message includes the identifier of the terminal device, the identifier of the second access network device, and the RRC configuration information of the second access network device.

[0320] The second access network device sends the RRC configuration information of the second access network device, so that in subsequent steps, the RRC configuration information of the second access network device can be sent to the terminal device for the terminal device to send RRC information to the second access network device, thereby improving the access rate of the terminal device to the second access network device.

[0321] It can be understood that the descriptions of the above RRC configuration information of the second access network device, redirected carrier information, system information of the second access network device, resource scheduling information of the second access network device, etc. can refer to the relevant descriptions in the above embodiments and will not be elaborated here.

[0322] S406. The second core network device sends a fifth response message to the first core network device.

[0323] In some embodiments, the fifth response message is a response to the fifth request message.

[0324] In some embodiments, the fifth response message may be a Create UEContext Response message.

[0325] In some embodiments, the relevant information in the fifth response message can be obtained from the information carried in the fourth response message.

[0326] In some embodiments, the fifth response message includes at least one of the following: the identifier of the terminal device; the identifier of the second access network device; the RRC configuration information of the second access network device; the system information of the second access network device; the resource scheduling information of the second access network device; the ephemeris information of the second access network device; or, redirection carrier information.

[0327] It can be understood that the RRC configuration information of the second access network device, the system information of the second access network device, the resource scheduling information of the second access network device, and the ephemeris information of the second access network device in the fifth response message are obtained from the information carried in the fourth response message.

[0328] The redirection carrier information in the fifth response message can be obtained from the information carried in the fourth response message, or can be information stored by the second core network device itself.

[0329] S407. The first core network device sends a third response message to the first access network device.

[0330] In some embodiments, the third response message may be a UE Access command message.

[0331] In some embodiments, the information included in the third response message can be obtained from the content of the fourth response message.

[0332] In some embodiments, the third response message includes the RRC configuration information of the second access network device.

[0333] In some embodiments, the third response message further includes at least one of the following: the identifier of the terminal device; redirection carrier information; the identifier of the second access network device; the system information of the second access network device; the resource scheduling information of the second access network device; or, the ephemeris information of the second access network device.

[0334] It can be understood that the RRC configuration information of the second access network device, the system information of the second access network device, the resource scheduling information of the second access network device, and the ephemeris information of the second access network device in the third response message are obtained from the information carried in the fifth response message.

[0335] The redirection carrier information in the third response message can be obtained from the information carried in the fifth response message, or can be information stored by the second core network device itself.

[0336] S408. The first access network device sends a first response message to the terminal device.

[0337] In some embodiments, the relevant information in the first response message can be obtained through the third response message.

[0338] It can be understood that if the first access network device receives the third response message before the first response message, the first response message may further include the information in the third response message, that is, the first response message includes the RRC configuration information and the redirected carrier information of the second access network device.

[0339] In some embodiments, the first response message may further include at least one of the following: redirected carrier information; ephemeris information of the second access network device; system information of the second access network device; or resource scheduling information of the second access network device.

[0340] It can be understood that the redirected carrier information in the first response message can be obtained through the redirected carrier information carried in the third response message, or can be the redirected carrier information stored by the first access network device itself.

[0341] In some embodiments, the ephemeris information of the second access network device in the first response message can be obtained through the ephemeris information of the second access network device carried in the third response message, or can be the ephemeris information of the second access network device stored by the first access network device itself.

[0342] The first response message is an RRC setup message, and before this first response message, the first access network device receives the third response message. This RRC setup message is used to instruct the second access network device to confirm the access of the terminal device.

[0343] It can be understood that the relevant descriptions of the redirected carrier information and the ephemeris information of the second access network device can refer to the relevant descriptions in step S202 and the like, and will not be elaborated here.

[0344] It can be understood that the relevant implementation manners of the first access network device sending the first response message to the terminal device can refer to the relevant implementation manners of step S304, and will not be elaborated here.

[0345] In some embodiments, if the first access network device does not receive the third response message within a predetermined time, it directly sends the first response message to the terminal device. At this time, the first response message is an RRC rejection message, and this RRC rejection message includes at least one of the following: redirected carrier information; or ephemeris information of the second access network device. The terminal device can establish a connection with the second access network device through this RRC rejection message.

[0346] In some embodiments, the first access network device sends a third request message to the first core network device. If the third response message is not received within a predetermined time after sending the third request message, the first access network device directly sends an RRC rejection message to the terminal device. At this time, there is a second access network device, and the first response message is an RRC rejection message. Then, the RRC rejection message is used to instruct the terminal device to access the second access network device, and the RRC rejection message includes at least one of the following: redirection carrier information; or, ephemeris information of the second access network device, and is used to instruct the terminal device to access the second access network device and includes redirection carrier information; or, the RRC rejection message including at least one of the ephemeris information of the second access network device may refer to the relevant implementation manners of steps S202 and S203, which will not be elaborated here.

[0347] In some embodiments, the predetermined time may not be pre-configured, which is used to prevent the second network device from not receiving the third response message for a long time and being unable to send the first response message to the terminal device, resulting in the situation that the terminal device cannot establish a connection with the access network device for a long time and the service cannot be completed.

[0348] S409. The terminal device sends a connection completion message to the second access network device.

[0349] It can be understood that the relevant implementation manner of the terminal device sending a connection completion message to the second access network device may refer to the relevant implementation manner of step S305, which will not be elaborated here.

[0350] In the embodiments of the present application, the terminal device camps on the first access network device with a large coverage area in the idle state to reduce mobility management. Therefore, the terminal device does not need to frequently perform cell reselection, that is, the terminal device does not need to frequently perform radio measurements, reducing the power consumption of the terminal device and ensuring the battery life of the terminal. When the terminal device needs to initiate a service, the second access network device with a small coverage area provides services for the terminal device to ensure the service quality of the service. And in the scenario where the first access network device and the second access network device perform mobility management in different core network devices, that is, the first access network device has a first core network device and the second access network device has a second core network device, through Figure 4 this way, the terminal can quickly access the second access network device, optimize the RRC connection establishment process, and compared with the process of first establishing an RRC connection and then performing a handover, reduce the signaling overhead and lower the delay.

[0351] In some embodiments, after the first access network device receives the first request message and determines that the terminal device needs to access the second access network device, for example, the first access network device determines that the terminal accesses the second access network device according to the tendency indication information in the paging indication message or the tendency indication information in the first request message. The first access network device may directly send a first response message to the terminal device, that is, the first response message is an RRC rejection message, and through Figure 2 and the manner described in related embodiments, the connection between the terminal device and the second access network device is established.

[0352] In other embodiments, after the first access network device receives the first request message, the first access network device determines that the terminal device needs to access the second access network device. For example, the first access network device determines that the terminal accesses the second access network device according to the tendency indication information in the paging indication message or the tendency indication information in the first request message. The first access network device may send a second request message to the second access network device, such as through Figure 3 and the manner described in related embodiments, the connection between the terminal device and the second access network device is established; or the first access network device may also send a third request message to the first core network device, such as through Figure 4 and the manner described in related embodiments, the connection between the terminal device and the second access network device is established. At this time, the first response message is an RRC establishment message.

[0353] In some embodiments, after the first access network device receives the first request message and determines that the terminal device needs to access the second access network device, and when the first access network device and the second access network device are satellites, and there is an inter-satellite link failure between the first access network device and the second access network device, or the first access network device does not receive a second response message or a third response message within a predetermined time, the first access network device may directly send a first response message to the terminal device (at this time, the first response message is an RRC rejection message, and there is a second access network device. At this time, the RRC rejection message indicates that the service is provided by the second access network device, that is, the terminal device establishes a connection with the second access network device), such as through Figure 2 and the manner described in related embodiments, the connection between the terminal device and the second access network device is established.

[0354] The predetermined time may be a preset time to avoid the situation that the terminal device cannot establish a connection with the access network device and cannot complete services due to the first access network device not receiving the second response message or the third response message for a long time.

[0355] In some embodiments, after the first access network device receives the first request message, it is determined that the terminal device needs to access the second access network device, and the first access network device and the second access network device perform mobility management under different core network devices, that is, the first access network device has a first core network device and the second access network device has a second core network device, the first access network device performs mobility management through the first core network device, and the second access network device performs mobility management through the second core network device. At this time, the first access network device may preferably send a first response message directly to the terminal device, and the first response message is an RRC rejection message, such as through Figure 2 And the method described in the relevant embodiments, the connection between the terminal device and the second access network device is realized. Of course, under this request, the first access network device can also send a third request message to the first core network device, such as through Figure 4 And the method described in the relevant embodiments is used to realize the connection between the terminal device and the second access network device.

[0356] Figure 5 It is a flow chart of a communication method according to another embodiment of the present application. It should be noted that the execution subject of the embodiment of the present application may be a terminal device, or a chip, a chip module or a wireless access device set in the terminal device. The wireless access device may be implemented by software or by a combination of software and hardware. The terminal device may be a mobile phone, a tablet computer, etc. Please refer to Figure 5 The method may include step S501. Figure 5 Steps in .

[0357] S501. Send a first request message to a first access network device.

[0358] In some embodiments, the first request message includes preference indication information corresponding to accessing the first access network device or accessing the second access network device.

[0359] In some embodiments, the terminal device resides in the first access network device.

[0360] In some embodiments, the coverage of the first access network device is greater than the coverage of the second access network device.

[0361] It can be understood that the relevant implementation method of the terminal device sending the first request message to the first access network device can refer to the relevant implementation method of step S201, step S301 and step S401, which will not be repeated here.

[0362] In some embodiments, the method further includes: the terminal device receives a first response message sent by the first access network device; and the terminal device establishes a connection with the first access network device or the second access network device based on the first response message.

[0363] In some embodiments, the first response message is a Radio Resource Control (RRC) rejection message; the first response message includes at least one of the following: redirection carrier information; or, ephemeris information of the second access network device.

[0364] In some embodiments, if the first access network device determines that the terminal device needs to access the second access network device and the first response message is an RRC rejection message, the first response message includes redirection carrier information, and the terminal device accesses the second access network device according to the redirection carrier information.

[0365] In some embodiments, the first response message is an RRC establishment message; the first response message includes at least one of the following: redirection carrier information; ephemeris information of the second access network device; RRC configuration information of the second access network device; system information of the second access network device; or, resource scheduling information of the second access network device.

[0366] In some embodiments, if the first access network device determines that the terminal device needs to access the second access network device and the first response message is an RRC establishment message, the first response message includes redirection carrier information and RRC configuration information of the second access network device, and the terminal device accesses the second access network device according to the redirection carrier information and the RRC configuration information of the second access network device. The RRC configuration information of the second access network device is sent by the second access network device to the terminal device. The manner in which the RRC configuration information of the second access network device is sent to the terminal device can refer to Figure 3 and Figure 4 the related implementation manners, which will not be elaborated here.

[0367] It can be understood that for a detailed introduction of the first response message, reference can be made to the related introduction of the first response message in step S202, step S304, and step S408, which will not be elaborated here.

[0368] In some embodiments, the first request message further includes at least one of the following: an identifier of the terminal device; a reason for establishing a connection; or, location information of the terminal device.

[0369] In some embodiments, the tendency indication information is used to indicate one of the following: preferentially use the service provided by the second access network device; the service provided by the second access network device; the service provided by the first access network device.

[0370] In some embodiments, the manner in which the first access network device determines whether the terminal device accesses the first access network device or the second access network device according to the tendency indication information can refer to Figures 2 to 4 the implementation manners in the related embodiments therein, which will not be elaborated here.

[0371] In some embodiments, the redirected carrier information includes any one of the following: New Radio (NR) carrier information; or, Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

[0372] In some embodiments, for a detailed introduction to the redirected carrier information, reference may be made to Figures 2 to 4 the content shown in the relevant embodiments therein, which will not be elaborated herein.

[0373] Figure 6 FIG. is a schematic flowchart of a communication method shown in another embodiment of the present application. It should be noted that the execution subject of the embodiments of the present application may be a first access network device, or a chip, a chip module, a wireless access device, etc. provided in the first access network device. The wireless access device may be implemented by software or by a combination of software and hardware. Please refer to Figure 6 and the method may include steps S601 and S602. The following will elaborate in detail Figure 6 each step in.

[0374] S601. Receive a first request message sent by a terminal device.

[0375] It can be understood that the relevant implementation manners for the terminal device to send the first request message to the first access network device may refer to the relevant implementation manners of step S201, step S301, step S401, and step S501, which will not be elaborated herein.

[0376] S602. Send a first response message to the terminal device.

[0377] In some embodiments, the first response message is used to instruct the terminal device to establish a connection with the first access network device or the second access network device.

[0378] In some embodiments, the terminal device camps on the first access network device, and the coverage range of the first access network device is greater than that of the second access network device.

[0379] It can be understood that for a detailed introduction to the first response message, reference may be made to the relevant introduction to the first response message in step S202, step S304, and step S408, which will not be elaborated herein.

[0380] In some embodiments, the method further includes: The first access network device receives a paging indication message sent by a first core network device, the paging indication message includes a tendency indication information for indicating access to the second access network device or access to the first access network device, and the first response message is determined based on the tendency indication information included in the paging indication message.

[0381] In some embodiments, the method further includes: a first access network device receiving a paging indication message sent by a first core network device, where the paging indication message includes tendency indication information for indicating accessing a second access network device or accessing the first access network device.

[0382] In some embodiments, the first request message includes tendency indication information for indicating accessing the first access network device or accessing the second access network device, and the first response message is determined based on the tendency indication information included in the first request message.

[0383] In some embodiments, the first request message further includes at least one of the following: an identifier of a terminal device; a reason for establishing a connection; or, location information of the terminal device.

[0384] In some embodiments, the tendency indication information is used to indicate one of the following: preferentially using the second access network device to provide services; the second access network device providing services; the first access network device providing services.

[0385] In some embodiments, the tendency indication information is used to indicate preferentially using the second access network device to provide services.

[0386] The first response message is a Radio Resource Control (RRC) rejection message or an RRC establishment message. The RRC rejection message indicates that the second access network device provides services, and the RRC establishment message includes RRC configuration information of the first access network device or RRC configuration information of the second access network device; the RRC establishment message indicates that the first access network device or the second access network device provides services. When the RRC establishment message indicates that the first access network device provides services, the RRC establishment message includes RRC configuration information of the first access network device; when the RRC establishment message indicates that the second access network device provides services, the RRC establishment message includes RRC configuration information of the second access network device.

[0387] In some embodiments, the RRC establishment message indicates that the second access network device provides services, that is, the RRC establishment message including RRC configuration information of the second access network device; the RRC establishment message includes at least one of the following: redirected carrier information; or, ephemeris information of the second access network device.

[0388] In some embodiments, the tendency indication information is used to indicate that the second access network device provides services; the first response message is an RRC rejection message, or an RRC establishment message; wherein, the RRC rejection message indicates that the second access network device provides services or indicates rejecting connection establishment, the RRC establishment message includes RRC configuration information of the second access network device, and the RRC establishment message indicates that the first access network device provides services.

[0389] In some embodiments, the preference indication information is used to indicate to preferentially use the second access network device to provide services or the preference indication information is used to indicate that the second access network device provides services; in the case of an inter-satellite link failure between the first access network device and the second access network device, or in the case where the first access network device has a first core network device and the second access network device has a second core network device, the first response message is an RRC rejection message, and the RRC rejection message indicates that the second access network device provides services. In some embodiments, the RRC rejection message includes at least one of the following: redirected carrier information; or, ephemeris information of the second access network device.

[0390] In some embodiments, the RRC establishment message includes at least one of redirected carrier information or RRC configuration information of the second access network device.

[0391] In some embodiments, the RRC establishment message further includes at least one of the following: ephemeris information of the second access network device; RRC configuration information of the second access network device; system information of the second access network device; or, resource scheduling information of the second access network device.

[0392] In some embodiments, the redirected carrier information includes any one of the following: New Radio (NR) carrier information; or, Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

[0393] In some embodiments, the preference indication information is used to indicate that the first access network device provides services; the first response message is an RRC establishment message, the RRC establishment message indicates that the first access network device provides services, and the first response message includes RRC configuration information of the first access network device.

[0394] In some embodiments, the method further includes: the first access network device sending a second request message to the second access network device, the second request message being used to indicate that the terminal device requests to access the second access network device; the first access network device receiving a second response message sent by the second access network device, the second response message including RRC configuration information of the second access network device.

[0395] In some embodiments, the second request message includes at least one of the following: an identifier of the terminal device; or, an identifier of the second access network device.

[0396] In some embodiments, in the case where the first access network device does not receive the second response message within a predetermined time, the first access network device sends a first response message to the terminal device, the first response message being an RRC rejection message, and the first response message includes at least one of the following: redirected carrier information; or, ephemeris information of the second access network device.

[0397] In some embodiments, the second response message further includes at least one of the following: an identifier of the terminal device; redirection carrier information; system information of the second access network device; resource scheduling information of the second access network device; or, ephemeris information of the second access network device.

[0398] In some embodiments, the related implementation manners of the first access network device sending the second request message to the second access network device and the first access network device receiving the second response message sent by the second access network device may refer to Figure 3 the implementation manners in the corresponding embodiments, which will not be elaborated herein.

[0399] In some embodiments, the method further includes: the first access network device sending a third request message to the first core network device, where the third request message is used to indicate that the terminal device needs to access the second access network device; the first access network device receiving a third response message sent by the first core network device, where the third response message includes RRC configuration information of the second access network device.

[0400] In some embodiments, the method further includes: when the first access network device does not receive the third response message within a predetermined time, sending a first response message to the terminal device, where the first response message is an RRC rejection message, and the first response message includes at least one of the following: redirection carrier information; or, ephemeris information of the second access network device. In some embodiments, the third request message includes at least one of the following: an identifier of the terminal device; first information; or, location information of the terminal device; where the first information is used to indicate that the second access network device provides services for the terminal device.

[0401] In some embodiments, the third response message further includes at least one of the following: an identifier of the terminal device; redirection carrier information; an identifier of the second access network device; system information of the second access network device; resource scheduling information of the second access network device; or, ephemeris information of the second access network device.

[0402] In some embodiments, the related implementation manners of the first access network device sending the third request message to the first core network device and the first access network device receiving the third response message sent by the first core network device may refer to Figure 4 the implementation manners in the corresponding embodiments, which will not be elaborated herein.

[0403] Figure 7 It is a schematic flowchart of a communication method shown in another embodiment of this application. It should be noted that the execution subject of the embodiments of this application may be the second access network device, or a chip, a chip module, a wireless access device, etc. disposed in the second access network device. The wireless access device may be implemented by software or by a combination of software and hardware. Please refer to Figure 7, the method may include steps S701 and S702. The following is a detailed description Figure 7 of each step in

[0404] S701. Receive a connection completion message sent by a terminal device.

[0405] In some embodiments, a second access network device receives a connection completion message sent by a terminal device.

[0406] S702. Establish a connection with the terminal device according to the connection completion message.

[0407] In some embodiments, a second access network device establishes a connection with the terminal device according to the connection completion message.

[0408] In some embodiments, reference may be made to the manner shown in step S305 to establish a connection with the second access network device through the connection completion message.

[0409] In some ways, reference may be made to the manner shown in step S409 to establish a connection with the second access network device through the connection completion message.

[0410] In some other embodiments, after step S203, the terminal device and the second access network device perform an access process. After the terminal device sends a connection completion message to the second access network device, a connection is established between the terminal device and the second access network device.

[0411] In some embodiments, the terminal device camps on a first access network device, and the coverage range of the first access network device is greater than the coverage range of the second access network device.

[0412] In some embodiments, the connection completion message is an RRC establishment completion message.

[0413] In some embodiments, before receiving the connection completion message sent by the terminal device, the method further includes: the second access network device receives a second request message sent by the first access network device, where the second request message is used to indicate that the terminal device requests to access the second access network device; the second access network device sends a second response message to the first access network device, and the second response message includes the RRC configuration information of the second access network device.

[0414] In some embodiments, when the first access network device does not receive the second response message within a predetermined time, the first access network device sends a first response message to the terminal device, the first response message is an RRC rejection message, and the first response message includes at least one of the following: redirection carrier information; or, ephemeris information of the second access network device.

[0415] In some embodiments, the second request message includes at least one of the following: an identifier of the terminal device; or, an identifier of the second access network device.

[0416] In some embodiments, the second response message further includes at least one of the following: an identifier of the terminal device; redirected carrier information; system information of the second access network device; resource scheduling information of the second access network device; or, ephemeris information of the second access network device.

[0417] In some embodiments, the related implementation manners for the second access network device to receive the second request message sent by the first access network device and for the second access network device to send a second response message to the first access network device may refer to Figure 3 the implementation manners in the corresponding embodiments, which will not be elaborated herein.

[0418] In some embodiments, before receiving the connection completion message sent by the terminal device, the method further includes: the second access network device receives a fourth request message sent by the second core network device, where the fourth request information is used to indicate that the terminal device requests to access the second access network device; the second access network device sends a fourth response message to the second core network device, and the fourth response message includes the RRC configuration information of the second access network device.

[0419] In some embodiments, the fourth request message includes at least one of the following: an identifier of the terminal device; or, location information of the terminal device.

[0420] In some embodiments, the fourth response message includes at least one of the following: an identifier of the terminal device; an identifier of the second access network device; system information of the second access network device; resource scheduling information of the second access network device; ephemeris information of the second access network device; or, redirected carrier information.

[0421] In some embodiments, the redirected carrier information includes any one of the following: New Radio (NR) carrier information; or, Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

[0422] In some embodiments, the related implementation manners for the second access network device to receive the fourth request message sent by the second core network device and for the second access network device to send a fourth response message to the second core network device may refer to Figure 4 the implementation manners in the corresponding embodiments, which will not be elaborated herein.

[0423] Figure 8 It is a schematic flowchart of a communication method shown in another embodiment of the present application. It should be noted that the execution subject of the embodiments of the present application may be a first core network device, or a chip, a chip module, a radio access device, etc. disposed in the first core network device. The radio access device may be implemented by software, or by a combination of software and hardware. Please refer to Figure 8 , and the method may include steps S801 to S803. The following is a detailed description.Figure 8 Each step in

[0424] S801. Receive a third request message sent by a first access network device. The third request message is used to indicate that a terminal device needs to access a second access network device.

[0425] In some embodiments, a first core network device receives a third request message sent by a first access network device.

[0426] In some embodiments, the first core network device is a network element for performing mobility management on the first access network device.

[0427] S802. Send a fifth request message to a second core network device. The fifth request message is used to indicate a request to create a context for the terminal device.

[0428] In some embodiments, the first core network device sends a fifth request message to the second core network device.

[0429] S803. Receive a fifth response message sent by the second core network device. The fifth response message is a response to the fifth request message.

[0430] In some embodiments, the first core network device receives a fifth response message sent by the second core network device.

[0431] In some embodiments, the terminal device resides in the first access network device, and the coverage range of the first access network device is greater than the coverage range of the second access network device.

[0432] Therefore, the access of the terminal device to the second access network device is completed through the interaction between the first core network and the second core network.

[0433] In some embodiments, the third request message includes at least one of the following: an identifier of the terminal device; first information; or location information of the terminal device, where the first information is used to indicate that the second access network device provides services.

[0434] It can be understood that the introduction of this third request message can refer to the relevant description in step S402, which will not be elaborated here.

[0435] In some embodiments, the fifth request message includes at least one of the following: an identifier of the terminal device; first information; or location information of the terminal device, where the first information is used to indicate that the second access network device provides services.

[0436] It can be understood that the introduction of this third request message can refer to the relevant description in step S402, which will not be elaborated here.

[0437] In some embodiments, the fifth response message includes at least one of the following: the identifier of the terminal device; the identifier of the second access network device; the radio resource control (RRC) configuration information of the second access network device; the system information of the second access network device; the resource scheduling information of the second access network device; the ephemeris information of the second access network device; or, the redirected carrier information.

[0438] In some embodiments, the redirected carrier information includes any one of the following: the New Radio (NR) carrier information; or, the Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

[0439] It can be understood that the introduction of the fifth response message can refer to the relevant description in step S406, which will not be elaborated here.

[0440] In some embodiments, after receiving the fifth response message sent by the second core network device, the method further includes: the first core network device sending a third response message to the second access network device, where the third response message includes the redirected carrier information and the RRC configuration information of the second access network device.

[0441] In some embodiments, the third response message further includes at least one of the following: the identifier of the terminal device; the identifier of the second access network device; the system information of the second access network device; the resource scheduling information of the second access network device; or, the ephemeris information of the second access network device.

[0442] It can be understood that the introduction of the third response message can refer to the relevant description in step S407, which will not be elaborated here.

[0443] In some embodiments, the method further includes: the first core network device sending a paging message to the first access network device, where the paging message is used to indicate that there is a pending service for the terminal device.

[0444] In some embodiments, the paging message includes a tendency indication information.

[0445] In some embodiments, the tendency indication information is used to indicate at least one of the following: preferentially using the service provided by the second access network device; the service provided by the second access network device; the service provided by the first access network device.

[0446] Figure 9 It is a schematic flowchart of a communication method shown in another embodiment of the present application. It should be noted that the execution subject of the embodiments of the present application can be the second core network device, or a chip, a chip module, a radio access device, etc. disposed in the second core network device. The radio access device can be implemented by software, or by a combination of software and hardware. The terminal device can be a mobile phone, a tablet computer, etc. Please refer to Figure 9 , and the method may include steps S901 to S902. The following will be described in detailFigure 9 Each step in

[0447] S901. Receive a fifth request message sent by a first core network device, where the fifth request message is used to indicate a request to create a context for a terminal device.

[0448] In some embodiments, a second core network device receives the fifth request message sent by the first core network device.

[0449] S902. Send a fifth response message to the first core network device, where the fifth response message is a response to the fifth request message.

[0450] In some embodiments, a second core network device receives the fifth request message sent by the first core network device.

[0451] In some embodiments, the terminal device camps on a first access network device, and the coverage range of the first access network device is greater than that of the second access network device.

[0452] In some embodiments, before sending the fifth response message to the first core network device, the method further includes: the second core network device sends a fourth request message to the second access network device; the second core network device receives a fourth response message sent by the second access network device, and the fourth response message includes the RRC configuration information of the second access network device.

[0453] In some embodiments, the fourth response message includes at least one of the following: an identifier of the terminal device; an identifier of the second access network device; the radio resource control (RRC) configuration information of the second access network device; the system information of the second access network device; the resource scheduling information of the second access network device; the ephemeris information of the second access network device; or, redirection carrier information.

[0454] It can be understood that the introduction of this fourth response message can refer to the relevant description in step S405, and details are not described here.

[0455] In some embodiments, the fifth request message includes at least one of the following: an identifier of the terminal device; a first piece of information; or, the location information of the terminal device, where the first piece of information is used to indicate that the second access network device provides services.

[0456] It can be understood that the introduction of this fifth request message can refer to the relevant description in step S403, and details are not described here.

[0457] In some embodiments, the fourth request message includes at least one of the following: an identifier of the terminal device; or, an identifier of the second access network device.

[0458] It can be understood that the introduction of this fourth request message can refer to the relevant description in step S404, and details are not described here.

[0459] In some embodiments, the fifth response message includes at least one of the following: an identifier of the terminal device; RRC configuration information of the second access network device; system information of the second access network device; resource scheduling information of the second access network device; ephemeris information of the second access network device; or redirection carrier information.

[0460] In some embodiments, the redirection carrier information includes any one of the following: New Radio (NR) carrier information; or Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

[0461] It can be understood that the description of the fifth response message can refer to the relevant description in step S406, which will not be elaborated here.

[0462] Figure 10 It is a schematic block diagram of a communication device shown in an embodiment of the present application. As Figure 10 shown, the communication device 1000 may include a sending and receiving module 1001.

[0463] In one embodiment, the communication device 1000 can be used to implement the operations corresponding to the terminal device in the above embodiments. For example, when used to implement the operations corresponding to the terminal device in the above embodiments, the communication device 1000 is on the network side. For example, the communication device 1000 is a terminal device, or a component configured in the terminal device, such as a chip or a circuit.

[0464] The communication device 1000 can implement Figures 2 to 9 the corresponding operations on the network side in the embodiment of the communication method shown. For example, the corresponding operations of the terminal device. The communication device 1000 may include modules for executing Figures 2 to 9 the methods executed on the network side in the embodiment of the communication method shown. For example, the methods executed by the terminal device. Moreover, each module in the communication device 1000 and the above other operations and / or functions respectively are for implementing Figures 2 to 9 the corresponding processes in the embodiment of the communication method shown.

[0465] The sending module 1001 is configured to send a first request message to the first access network device; wherein, the first request message includes a tendency indication information for indicating to access the first access network device or the second access network device. The terminal device camps on the first access network device, and the coverage range of the first access network device is greater than that of the second access network device.

[0466] In some embodiments, the communication device 1000 further includes: a receiving module and a processing module; the receiving module is configured to receive a first response message sent by the first access network device; the processing module is configured to establish a connection with the first access network device or the second access network device according to the first response message.

[0467] In some embodiments, the first request message further includes at least one of the following: an identifier of the terminal device; a reason for establishing a connection; or, location information of the terminal device.

[0468] In some embodiments, the tendency indication information is used to indicate one of the following: preferentially use the second access network device to provide services; the second access network device provides services; the first access network device provides services.

[0469] In some embodiments, the first response message is a Radio Resource Control (RRC) rejection message; the first response message includes at least one of the following: redirection carrier information; or, ephemeris information of the second access network device.

[0470] In some embodiments, the first response message is an RRC establishment message; the first response message includes at least one of the following: redirection carrier information; ephemeris information of the second access network device;

[0471] RRC configuration information of the second access network device; system information of the second access network device; or, resource scheduling information of the second access network device.

[0472] In some embodiments, the redirection carrier information includes any one of the following: New Radio (NR) carrier information; or, Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

[0473] Figure 11 is a schematic block diagram of a communication device shown in another embodiment of the present application. As Figure 11 shown, the communication device 1100 may include a receiving module 1101 and a transmitting module 1102.

[0474] In one embodiment, the communication device 1100 can be used to implement the operations corresponding to the first access network device in the above embodiments. For example, to implement the operations corresponding to the first access network device in the above embodiments, the communication device 1100 is on the network side. For example, the communication device 1100 is the first access network device, or a component configured in the first access network device, such as a chip or a circuit.

[0475] The communication device 1100 can implement Figures 2 to 9 the corresponding operations on the network side in the embodiments of the communication method shown, such as the corresponding operations of the first access network device. The communication device 1100 may include modules for executing Figures 2 to 9 the methods executed on the network side in the embodiments of the communication method shown, such as the methods executed by the first access network device. And, each module in the communication device 1100 and the above other operations and / or functions respectively are for implementing Figures 2 to 9 the corresponding processes in the embodiments of the communication method shown.

[0476] A receiving module 1001, configured to receive a first request message sent by a terminal device;

[0477] A sending module 1002, configured to send a first response message to the terminal device;

[0478] Wherein, the first response message is used to instruct the terminal device to establish a connection with a first access network device or a second access network device. The terminal device camps on the first access network device, and the coverage range of the first access network device is larger than that of the second access network device.

[0479] In some embodiments, the receiving module 1001 is further configured to receive a paging indication message sent by a first core network device. The paging indication message includes tendency indication information for indicating access to the second access network device or access to the first access network device, and the first response message is determined based on the tendency indication information included in the paging indication message.

[0480] In some embodiments, the receiving module 1001 is further configured to receive a paging indication message sent by a first core network device. The paging indication message includes tendency indication information for indicating access to the second access network device or access to the first access network device.

[0481] In some embodiments, the first request message includes tendency indication information for indicating access to the first access network device or access to the second access network device, and the first response message is determined based on the tendency indication information included in the first request message.

[0482] In some embodiments, the first request message further includes at least one of the following: an identifier of the terminal device; a reason for establishing a connection; or, location information of the terminal device.

[0483] In some embodiments, the tendency indication information is used to indicate one of the following: preferentially using the second access network device to provide services; the second access network device provides services; the first access network device provides services.

[0484] In some embodiments, the tendency indication information is used to indicate preferentially using the second access network device to provide services;

[0485] The first response message is a Radio Resource Control (RRC) rejection message or an RRC establishment message. The RRC rejection message indicates that the second access network device provides services, and the RRC establishment message includes RRC configuration information of the first access network device or RRC configuration information of the second access network device.

[0486] In some embodiments, the RRC rejection message or the RRC establishment message including the RRC configuration information of the second access network device includes at least one of the following: redirection carrier information; or, ephemeris information of the second access network device.

[0487] In some embodiments, the preference indication information is used to indicate that the second access network device provides services; the first response message is an RRC rejection message, or an RRC establishment message; wherein, the RRC rejection message indicates that the second access network device provides services or indicates a rejection of connection establishment, and the RRC establishment message includes the RRC configuration information of the second access network device.

[0488] In some embodiments, the preference indication information is used to indicate a preference for using the second access network device to provide services or the preference indication information is used to indicate that the second access network device provides services;

[0489] In the case where there is an inter-satellite link failure between the first access network device and the second access network device, or in the case where the first access network device has a first core network device and the second access network device has a second core network device, the first response message is an RRC rejection message, and the RRC rejection message indicates that the second access network device provides services.

[0490] In some embodiments, the RRC rejection message includes at least one of the following: redirection carrier information; or, the ephemeris information of the second access network device.

[0491] In some embodiments, the RRC establishment message includes at least one of the redirection carrier information or the RRC configuration information of the second access network device.

[0492] In some embodiments, the RRC establishment message further includes at least one of the following: the ephemeris information of the second access network device; the RRC configuration information of the second access network device; the system information of the second access network device; or, the resource scheduling information of the second access network device.

[0493] In some embodiments, the redirection carrier information includes any one of the following: New Radio (NR) carrier information; or, Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

[0494] In some embodiments, the preference indication information is used to indicate that the first access network device provides services; the first response message is an RRC establishment message, the RRC establishment message indicates that the first access network device provides services, and the first response message includes the RRC configuration information of the first access network device.

[0495] In some embodiments, the sending module 1002 is further configured to send a second request message to the second access network device, and the second request message is used to indicate that the terminal device requests to access the second access network device;

[0496] The receiving module 1001 is further configured to receive a second response message sent by the second access network device, and the second response message includes the RRC configuration information of the second access network device.

[0497] In some embodiments, the receiving module 1001 is further configured to send a first response message to the terminal device when the second response message is not received within a predetermined time. The first response message is an RRC rejection message, and the first response message includes at least one of the following: redirection carrier information; or, ephemeris information of the second access network device.

[0498] In some embodiments, the second request message includes at least one of the following: an identifier of the terminal device; or, an identifier of the second access network device.

[0499] In some embodiments, the second response message further includes at least one of the following: an identifier of the terminal device; redirection carrier information; system information of the second access network device; resource scheduling information of the second access network device; or, ephemeris information of the second access network device.

[0500] In some embodiments, the sending module 1002 is further configured to send a third request message to the first core network device, where the third request message is used to indicate that the terminal device needs to access the second access network device;

[0501] The receiving module 1001 is further configured to receive a third response message sent by the first core network device, where the third response message includes RRC configuration information of the second access network device.

[0502] In some embodiments, the receiving module 1001 is further configured to send a first response message to the terminal device when the third response message is not received within a predetermined time. The first response message is an RRC rejection message, and the first response message includes at least one of the following: redirection carrier information; or, ephemeris information of the second access network device.

[0503] In some embodiments, the third request message includes at least one of the following: an identifier of the terminal device; first information; or, location information of the terminal device; where the first information is used to indicate that the second access network device provides services for the terminal device.

[0504] In some embodiments, the third response message further includes at least one of the following: an identifier of the terminal device; redirection carrier information; an identifier of the second access network device; system information of the second access network device; resource scheduling information of the second access network device; or, ephemeris information of the second access network device.

[0505] Figure 12 is a schematic block diagram of a communication device shown in another embodiment of the present application. As Figure 12 shown, the communication device 1200 may include a receiving module 1201 and a processing module 1202.

[0506] In one embodiment, the communication device 1200 can be used to implement the operations corresponding to the second access network device in the above embodiments. For example, to implement the operations corresponding to the second access network device in the above embodiments, the communication device 1200 is on the network side. For example, the communication device 1200 is the second access network device, or a component configured in the second access network device, such as a chip or a circuit.

[0507] The communication device 1200 can implement Figures 2 to 9 the corresponding operations on the network side in the embodiments of the communication method shown, such as the corresponding operations of the second access network device. The communication device 1200 may include modules for performing Figures 2 to 9 the methods executed by the network side in the embodiments of the communication method shown, such as the methods executed by the second access network device. Moreover, each module in the communication device 1200 and the above other operations and / or functions respectively serve to implement Figures 2 to 9 the corresponding processes in the embodiments of the communication method shown.

[0508] A receiving module 1201, configured to receive a connection completion message sent by a terminal device;

[0509] A processing module 1202, configured to establish a connection with the terminal device according to the connection completion message; wherein, the terminal device camps on a first access network device, and the coverage range of the first access network device is greater than the coverage range of the second access network device.

[0510] In some embodiments, the connection completion message is an RRC establishment completion message.

[0511] In some embodiments, the communication device 1200 further includes a sending module;

[0512] The processing module 1202 is further configured to receive a second request message sent by the first access network device, where the second request message is used to indicate that the terminal device requests to access the second access network device;

[0513] The sending module is configured to send a second response message to the first access network device, where the second response message includes the RRC configuration information of the second access network device.

[0514] In some embodiments, the second request message includes at least one of the following: an identifier of the terminal device; or, an identifier of the second access network device.

[0515] In some embodiments, the second response message further includes at least one of the following: an identifier of the terminal device; redirection carrier information; system information of the second access network device; resource scheduling information of the second access network device; or, ephemeris information of the second access network device.

[0516] In some embodiments, the receiving module 1201 is further configured to receive a fourth request message sent by a second core network device, where the fourth request message is used to instruct the terminal device to request access to a second access network device;

[0517] The sending module is further configured to send a fourth response message to the second core network device, where the fourth response message includes RRC configuration information of the second access network device.

[0518] In some embodiments, the fourth request message includes at least one of the following: an identifier of the terminal device; or, location information of the terminal device.

[0519] In some embodiments, the fourth response message includes at least one of the following: an identifier of the terminal device; an identifier of the second access network device; system information of the second access network device; resource scheduling information of the second access network device; ephemeris information of the second access network device; or, redirected carrier information.

[0520] In some embodiments, the redirected carrier information includes any one of the following: New Radio (NR) carrier information; or, Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

[0521] Figure 13 It is a schematic block diagram of a communication device shown in another embodiment of the present application. As Figure 13 shown, the communication device 1300 may include a receiving module 1301 and a sending module 1302.

[0522] In one embodiment, the communication device 1300 can be used to implement the operations corresponding to the first core network device in the above embodiments. For example, to implement the operations corresponding to the first core network device in the above embodiments, the communication device 1300 is on the network side. For example, the communication device 1300 is the first core network device, or a component configured in the first core network device, such as a chip or a circuit.

[0523] The communication device 1300 can implement Figures 2 to 9 the corresponding operations on the network side in the embodiments of the communication method shown, such as the corresponding operations of the first core network device. The communication device 1300 may include modules for executing Figures 2 to 9 the methods executed on the network side in the embodiments of the communication method shown, such as the methods executed by the first core network device. And, each module in the communication device 1300 and the above other operations and / or functions respectively are for implementing Figures 2 to 9 the corresponding processes in the embodiments of the communication method shown.

[0524] The receiving module 1301 is configured to receive a third request message sent by a first access network device, where the third request message is used to instruct the terminal device to need to access a second access network device;

[0525] A sending module 1302, configured to send a fifth request message to a second core network device, where the fifth request message is used to indicate a request to create a context of a terminal device;

[0526] A receiving module 1301 is further configured to receive a fifth response message sent by the second core network device, where the fifth response message is a response to the fifth request message;

[0527] Wherein, the terminal device camps on a first access network device, and a coverage range of the first access network device is greater than a coverage range of a second access network device.

[0528] In some embodiments, the third request message includes at least one of the following: an identifier of the terminal device; first information; or location information of the terminal device, where the first information is used to indicate that the second access network device provides services.

[0529] In some embodiments, the fifth request message includes at least one of the following: an identifier of the terminal device; first information; or location information of the terminal device, where the first information is used to indicate that the second access network device provides services.

[0530] In some embodiments, the fifth response message includes at least one of the following: an identifier of the terminal device; an identifier of the second access network device; radio resource control (RRC) configuration information of the second access network device; system information of the second access network device; resource scheduling information of the second access network device; ephemeris information of the second access network device; or redirection carrier information.

[0531] In some embodiments, the redirection carrier information includes any one of the following: new radio (NR) carrier information; or evolved universal terrestrial radio access (EUTRA) carrier information.

[0532] In some embodiments, the sending module 1302 is further configured to send a third response message to the second access network device, where the third response message includes redirection carrier information and RRC configuration information of the second access network device.

[0533] In some embodiments, the third response message further includes at least one of the following: an identifier of the terminal device; an identifier of the second access network device; system information of the second access network device; resource scheduling information of the second access network device; or ephemeris information of the second access network device.

[0534] In some embodiments, the sending module 1302 is further configured to send a paging message to the first access network device, where the paging message is used to indicate that there is pending traffic for the terminal device.

[0535] In some embodiments, the paging message includes tendency indication information.

[0536] In some embodiments, the tendency indication information is used to indicate at least one of the following: preferentially using the second access network device to provide services; the second access network device providing services; the first access network device providing services.

[0537] Figure 14 is a schematic block diagram of a communication device shown in another embodiment of the present application. As Figure 14 shown, the communication device 1400 may include a receiving module 1401 and a transmitting module 1402.

[0538] In one embodiment, the communication device 1400 can be used to implement the operations corresponding to the second core network device in the above embodiments. For example, for implementing the operations corresponding to the second core network device in the above embodiments, the communication device 1400 is on the network side. For example, the communication device 1400 is the second core network device, or a component configured in the second core network device, such as a chip or a circuit.

[0539] The communication device 1400 can implement Figures 2 to 9 the corresponding operations on the network side in the embodiment of the communication method shown, such as the corresponding operations of the second core network device. The communication device 1400 may include modules for executing Figures 2 to 9 the methods executed on the network side in the embodiment of the communication method shown, such as the methods executed by the second core network device. And, each module in the communication device 1400 and the above other operations and / or functions respectively are for implementing Figures 2 to 9 the corresponding processes in the embodiment of the communication method shown.

[0540] The receiving module 1401 is configured to receive a fifth request message sent by the first core network device, where the fifth request message is used to indicate a request to create a context of a terminal device;

[0541] The transmitting module 1402 is configured to send a fifth response message to the first core network device, where the fifth response message is a response to the fifth request message;

[0542] Wherein, the terminal device camps on the first access network device, and the coverage range of the first access network device is greater than the coverage range of the second access network device.

[0543] In some embodiments, the transmitting module 1402 is further configured to send a fourth request message to the second access network device;

[0544] The receiving module 1401 is further configured to receive a fourth response message sent by the second access network device, where the fourth response message includes the RRC configuration information of the second access network device.

[0545] In some embodiments, the fifth request message includes at least one of the following: an identifier of a terminal device; first information; or, location information of the terminal device, where the first information is used to instruct a second access network device to provide services.

[0546] In some embodiments, the fourth response message includes at least one of the following: an identifier of a terminal device; an identifier of a second access network device; radio resource control (RRC) configuration information of the second access network device; system information of the second access network device; resource scheduling information of the second access network device; ephemeris information of the second access network device; or, redirected carrier information.

[0547] In some embodiments, the fourth request message includes at least one of the following: an identifier of a terminal device; or, an identifier of a second access network device.

[0548] In some embodiments, the fifth response message includes at least one of the following: an identifier of a terminal device; RRC configuration information of the second access network device; system information of the second access network device; resource scheduling information of the second access network device; ephemeris information of the second access network device; or, redirected carrier information.

[0549] In some embodiments, the redirected carrier information includes any one of the following: New Radio (NR) carrier information; or, Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

[0550] Figure 15 is a schematic block diagram of a communication device shown in an embodiment of this application. As Figure 15 shown, the communication device 150 may be an access network device (such as a first access network device, a second access network device), may also be a terminal, or may also be a core network device (such as a first core network device, a second core network device). The communication device 150 can be used to implement the methods described in the foregoing method embodiments. For details, refer to the descriptions in the foregoing method embodiments.

[0551] The communication device 150 includes at least one processor 151 and a memory 152 communicatively connected to the at least one processor 151.

[0552] The memory 152 stores instructions executable by the at least one processor 151. The instructions are executed by the at least one processor 151 so that the at least one processor 151 executes the foregoing methods.

[0553] In some embodiments, the communication device 150 may further include a transceiver 153, and the transceiver 153 may include: a transmitter and / or a receiver. The transmitter may also be referred to as a sender, a transmitter, a transmitting port, a transmitting interface, or other similar descriptions, and the receiver may also be referred to as a receiver, a receiving port, a receiving interface, or other similar descriptions. Exemplarily, each of the memory 152, the processor 151, and the transceiver 153 is interconnected via a bus 154.

[0554] The processor 150 may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), etc. The general-purpose processor may be a microprocessor, or the processor may also be any conventional processor, etc. The steps of the method disclosed in conjunction with the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0555] In some embodiments, all or part of the memory 152 may also be outside the communication device 150.

[0556] In some embodiments, if the communication device 150 is a terminal, then the terminal includes: a processor, and a memory communicatively connected to the processor; the memory stores instructions executable by at least one processor; the instructions are executed by at least one processor, so that at least one processor can execute the communication method performed by the terminal as described above.

[0557] In some embodiments, if the communication device 150 is a first access network device, then the first access network device includes: a processor, and a memory communicatively connected to the processor; the memory stores instructions executable by at least one processor; the instructions are executed by at least one processor, so that at least one processor can execute the communication method performed by the first access network device as described above.

[0558] In some embodiments, if the communication device 150 is a second access network device, then the second access network device includes: a processor, and a memory communicatively connected to the processor; the memory stores instructions executable by at least one processor; the instructions are executed by at least one processor, so that at least one processor can execute the communication method performed by the second access network device as described above.

[0559] In some embodiments, the communication device 150 is a first core network device. The first core network device includes: a processor, and a memory communicatively connected to the processor; the memory stores instructions executable by at least one processor; the instructions are executed by at least one processor so that at least one processor can execute the communication method performed by the first core network device as described above.

[0560] In some embodiments, the communication device 150 is a second core network device. The second core network device includes: a processor, and a memory communicatively connected to the processor; the memory stores instructions executable by at least one processor; the instructions are executed by at least one processor so that at least one processor can execute the communication method performed by the second core network device as described above.

[0561] An embodiment of the present application further provides a computer-readable storage medium. Computer-executable instructions are stored in the computer-readable storage medium. When the computer-executable instructions are executed by a processor, they are used to implement the communication method shown in any of the above embodiments.

[0562] An embodiment of the present application further provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements the communication method shown in any of the above embodiments.

[0563] An embodiment of the present application provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements the communication method shown in any of the above embodiments.

[0564] An embodiment of the present application provides a chip. A computer program is stored on the chip. When the computer program is executed by the chip, it implements the communication method shown in any of the above embodiments.

[0565] An embodiment of the present application provides a chip module. A computer program is stored on the chip module. When the computer program is executed by the chip module, it implements the communication method shown in any of the above embodiments.

[0566] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include known common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and embodiments are only to be considered as exemplary, and the true scope and spirit of the present application are pointed out by the following claims.

[0567] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A communication method, characterized in that, Applied to a terminal device, the method includes: Sending a first request message to a first access network device; Wherein, the first request message includes tendency indication information for indicating accessing the first access network device or the second access network device, the terminal device camps on the first access network device, and the coverage range of the first access network device is greater than that of the second access network device.

2. The method according to claim 1, wherein The method further includes: Receiving a first response message sent by the first access network device; Establishing a connection with the first access network device or the second access network device according to the first response message.

3. The method according to claim 1, wherein The first request message further includes at least one of the following: The identifier of the terminal device; The reason for establishing the connection; or, The location information of the terminal device.

4. The method according to any one of claims 1 to 3, characterized in that The tendency indication information is used to indicate one of the following: Preferentially using the second access network device to provide services; The second access network device provides services; The first access network device provides services.

5. The method according to claim 2, wherein The first response message is a Radio Resource Control (RRC) reject message; the first response message includes at least one of the following: Redirect carrier information; or, The ephemeris information of the second access network device.

6. The method according to claim 2, wherein The first response message is an RRC establishment message; the first response message includes at least one of the following: Redirect carrier information; The ephemeris information of the second access network device; The RRC configuration information of the second access network device; The system information of the second access network device; or, The resource scheduling information of the second access network device.

7. The method according to claim 5 or 6, characterized in that The redirect carrier information includes any one of the following: New Radio (NR) carrier information; or, Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

8. A communication method, characterized in that, Applied to a first access network device, the method includes: Receiving a first request message sent by a terminal device; Sending a first response message to the terminal device; Wherein, the first response message is used to indicate that the terminal device establishes a connection with the first access network device or the second access network device, the terminal device camps on the first access network device, and the coverage range of the first access network device is greater than that of the second access network device.

9. The method according to claim 8, wherein The method further includes: Receiving a paging indication message sent by a first core network device, the paging indication message includes tendency indication information for indicating accessing the second access network device or the first access network device, and the first response message is determined based on the tendency indication information included in the paging indication message.

10. The method according to claim 8, characterized in that, The method further includes: Receiving a paging indication message sent by a first core network device, the paging indication message includes tendency indication information for indicating accessing the second access network device or the first access network device.

11. The method according to claim 8 or 10, characterized in that, The first request message includes tendency indication information for indicating accessing the first access network device or the second access network device, and the first response message is determined based on the tendency indication information included in the first request message.

12. The method according to claim 11, characterized in that The first request message further includes at least one of the following: The identifier of the terminal device; The reason for establishing the connection; or, The location information of the terminal device.

13. The method according to claim 11, characterized in that, The tendency indication information is used to indicate one of the following: Preferentially use the second access network device to provide services; The second access network device provides services; The first access network device provides services.

14. The method according to claim 13, wherein The tendency indication information is used to indicate preferentially using the second access network device to provide services; The first response message is a Radio Resource Control (RRC) rejection message or an RRC establishment message. The RRC rejection message indicates that the second access network device provides services, and the RRC establishment message includes the RRC configuration information of the first access network device or the RRC configuration information of the second access network device.

15. The method according to claim 14, wherein The RRC rejection message or the RRC establishment message including the RRC configuration information of the second access network device includes at least one of the following: Redirect carrier information; or, Ephemeris information of the second access network device.

16. The method according to claim 13, wherein The tendency indication information is used to indicate that the second access network device provides services; The first response message is an RRC rejection message, or the RRC establishment message; Wherein, the RRC rejection message indicates that the second access network device provides services or indicates rejection of connection establishment, and the RRC establishment message includes the RRC configuration information of the second access network device.

17. The method according to claim 13, wherein The tendency indication information is used to indicate preferentially using the second access network device to provide services or the tendency indication information is used to indicate that the second access network device provides services; In the case where there is an inter-satellite link failure between the first access network device and the second access network device, or in the case where the first access network device has a first core network device and the second access network device has a second core network device, the first response message is an RRC rejection message, and the RRC rejection message indicates that the second access network device provides services.

18. The method according to claim 17, characterized in that, The RRC rejection message includes at least one of the following: Redirect carrier information; or, Ephemeris information of the second access network device.

19. The method according to claim 16, characterized in that The RRC establishment message includes at least one of the following: Redirect carrier information; or, Ephemeris information of the second access network device.

20. The method according to claim 19, wherein The RRC establishment message further includes at least one of the following: System information of the second access network device; or, Resource scheduling information of the second access network device.

21. The method according to claim 19, wherein The redirect carrier information includes any one of the following: New Radio (NR) carrier information; or, Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

22. The method according to claim 13, characterized in that, The tendency indication information is used to indicate that the first access network device provides services; The first response message is an RRC establishment message, and the RRC establishment message includes the RRC configuration information of the first access network device.

23. The method according to claim 8, characterized in that The method further includes: Sending a second request message to the second access network device, where the second request message is used to indicate that the terminal device requests to access the second access network device; Receiving a second response message sent by the second access network device, where the second response message includes the RRC configuration information of the second access network device.

24. The method according to claim 23, wherein The method further includes: In case the second response message is not received within a predetermined time, send a first response message to the terminal device, where the first response message is an RRC rejection message, and the first response message includes at least one of the following: redirection carrier information; or, ephemeris information of the second access network device.

25. The method according to claim 23 or 24, characterized in that, The second request message includes at least one of the following: an identifier of the terminal device; or, an identifier of the second access network device.

26. The method according to claim 23 or 24, characterized in that, The second response message further includes at least one of the following: An identifier of the terminal device; Redirection carrier information; System information of the second access network device; Resource scheduling information of the second access network device; or, Ephemeris information of the second access network device.

27. The method according to claim 8, characterized in that The method further includes: Send a third request message to a first core network device, where the third request message is used to indicate that the terminal device needs to access the second access network device; Receive a third response message sent by the first core network device, where the third response message includes RRC configuration information of the second access network device.

28. The method according to claim 27, wherein The method further includes: In case the third response message is not received within a predetermined time, send a first response message to the terminal device, where the first response message is an RRC rejection message, and the first response message includes at least one of the following: redirection carrier information; or, ephemeris information of the second access network device.

29. The method according to claim 27 or 28, characterized in that, The third request message includes at least one of the following: An identifier of the terminal device; First information; or, Location information of the terminal device; where the first information is used to indicate that the second access network device provides services for the terminal device.

30. The method according to claim 27 or 28, characterized in that, The third response message further includes at least one of the following: An identifier of the terminal device; Redirection carrier information; An identifier of the second access network device; System information of the second access network device; Resource scheduling information of the second access network device; or, Ephemeris information of the second access network device.

31. A communication method, characterized in that, Applied to a second access network device, the method includes: Receive a connection completion message sent by a terminal device; Establish a connection with the terminal device according to the connection completion message; Wherein, the terminal device camps on a first access network device, and the coverage range of the first access network device is greater than the coverage range of the second access network device.

32. The method according to claim 31, wherein The connection completion message is an RRC connection establishment completion message.

33. The method according to claim 31 or 32, characterized in that, Before receiving the connection completion message sent by the terminal device, the method further includes: Receive a second request message sent by the first access network device, where the second request message is used to indicate that the terminal device requests to access the second access network device; Send a second response message to the first access network device, where the second response message includes RRC configuration information of the second access network device.

34. The method according to claim 33, characterized in that, The second request message includes at least one of the following: an identifier of the terminal device; or, an identifier of the second access network device.

35. The method according to claim 33, wherein The second response message further includes at least one of the following: An identifier of the terminal device; Redirection carrier information; System information of the second access network device; Resource scheduling information of the second access network device; or, The ephemeris information of the second access network device.

36. The method according to claim 31 or 32, characterized in that, Before receiving the connection completion message sent by the receiving terminal device, the method further includes: Receiving a fourth request message sent by a second core network device, where the fourth request information is used to indicate that the terminal device requests to access the second access network device; Sending a fourth response message to the second core network device, where the fourth response message includes the RRC configuration information of the second access network device.

37. The method according to claim 36, wherein The fourth request message includes at least one of the following: the identifier of the terminal device; or, the location information of the terminal device.

38. The method according to claim 36, wherein The fourth response message further includes at least one of the following: The identifier of the terminal device; The identifier of the second access network device; The system information of the second access network device; The resource scheduling information of the second access network device; The ephemeris information of the second access network device; Or, Redirect carrier information.

39. The method according to claim 35 or 38, characterized in that, The redirect carrier information includes any one of the following: New Radio (NR) carrier information; or, Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

40. A communication method, characterized in that, Applied to a first core network device, the method includes: Receiving a third request message sent by a first access network device, where the third request message is used to indicate that a terminal device needs to access a second access network device; Sending a fifth request message to a second core network device, where the fifth request message is used to indicate a request to create a context for the terminal device; Receiving a fifth response message sent by the second core network device, where the fifth response message is a response to the fifth request message; Wherein, the terminal device camps on the first access network device, and the coverage range of the first access network device is greater than the coverage range of the second access network device.

41. The method according to claim 40, wherein The third request message includes at least one of the following: the identifier of the terminal device; first information; or, the location information of the terminal device, where the first information is used to indicate that the second access network device provides services.

42. The method according to claim 40 or 41, characterized in that, The fifth request message includes at least one of the following: the identifier of the terminal device; first information; or, the location information of the terminal device, where the first information is used to indicate that the second access network device provides services.

43. The method according to claim 40 or 41, characterized in that, The fifth response message includes at least one of the following: The identifier of the terminal device; The identifier of the second access network device; The Radio Resource Control (RRC) configuration information of the second access network device; The system information of the second access network device; The resource scheduling information of the second access network device; The ephemeris information of the second access network device; Or, Redirect carrier information.

44. The method according to claim 43, wherein, The redirect carrier information includes any one of the following: New Radio (NR) carrier information; or, Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

45. The method according to claim 40 or 41, characterized in that, After receiving the fifth response message sent by the second core network device, the method further includes: Sending a third response message to the second access network device, where the third response message includes redirect carrier information and the RRC configuration information of the second access network device.

46. The method according to claim 45, wherein The third response message further includes at least one of the following: The identifier of the terminal device; The identifier of the second access network device; The system information of the second access network device; The resource scheduling information of the second access network device; or, The ephemeris information of the second access network device.

47. The method according to claim 40 or 41, characterized in that, The method further includes: Sending a paging message to a first access network device, where the paging message is used to indicate that there is a pending service for the terminal device.

48. The method according to claim 47, wherein The paging message includes propensity indication information.

49. The method according to claim 48, characterized in that, The propensity indication information is used to indicate at least one of the following: Preferentially use the service provided by the second access network device; The service provided by the second access network device; The service provided by the first access network device.

50. A communication method, characterized in that, Applied to a second core network device, the method includes: Receiving a fifth request message sent by a first core network device, where the fifth request message is used to indicate a request to create a context for a terminal device; Sending a fifth response message to the first core network device, where the fifth response message is a response to the fifth request message; Wherein, the terminal device camps on the first access network device, and the coverage range of the first access network device is greater than the coverage range of the second access network device.

51. The method according to claim 50, characterized in that, Before sending the fifth response message to the first core network device, the method further includes: Sending a fourth request message to a second access network device; Receiving a fourth response message sent by the second access network device, where the fourth response message includes the RRC configuration information of the second access network device.

52. The method according to claim 50 or 51, characterized in that, The fifth request message includes at least one of the following: the identifier of the terminal device; the first information; or, the location information of the terminal device, where the first information is used to indicate that the second access network device provides service.

53. The method according to claim 50 or 51, characterized in that, The fifth response message includes at least one of the following: The identifier of the terminal device; The identifier of the second access network device; The radio resource control (RRC) configuration information of the second access network device; The system information of the second access network device; The resource scheduling information of the second access network device; The ephemeris information of the second access network device; Or, Redirected carrier information.

54. The method according to claim 51, wherein The fourth request message includes at least one of the following: the identifier of the terminal device; or, the identifier of the second access network device.

55. The method according to claim 51 or 54, characterized in that, The fourth response message includes at least one of the following: The identifier of the terminal device; The system information of the second access network device; The resource scheduling information of the second access network device; The ephemeris information of the second access network device; or, Redirected carrier information.

56. The method according to claim 53, wherein The redirected carrier information includes any one of the following: New Radio (NR) carrier information; or, Evolved Universal Terrestrial Radio Access (EUTRA) carrier information.

57. A communication device, characterized in that, Applied to a terminal device, the apparatus includes: A sending module, configured to send a first request message to a first access network device; Wherein, the first request message includes propensity indication information for indicating accessing the first access network device or accessing the second access network device, the terminal device camps on the first access network device, and the coverage range of the first access network device is greater than the coverage range of the second access network device.

58. A communication device, characterized in that, Applied to a first access network device, the apparatus includes: A receiving module, configured to receive a first request message sent by a terminal device; A sending module, configured to send a first response message to the terminal device; Among them, the first response message is used to instruct the terminal device to establish a connection with the first access network device or the second access network device. The terminal device camps on the first access network device, and the coverage range of the first access network device is larger than that of the second access network device.

59. A communication device, characterized in that, Applied to the second access network device, the apparatus includes: a receiving module, configured to receive a connection completion message sent by a terminal device; a processing module, configured to establish a connection with the terminal device according to the connection completion message; Among them, the terminal device camps on the first access network device, and the coverage range of the first access network device is larger than that of the second access network device.

60. A communication device, characterized in that, Applied to the first core network device, the apparatus includes: a receiving module, configured to receive a third request message sent by the first access network device, where the third request message is used to indicate that a terminal device needs to access the second access network device; a sending module, configured to send a fifth request message to the second core network device, where the fifth request message is used to indicate a request to create a context of the terminal device; The receiving module is further configured to receive a fifth response message sent by the second core network device, where the fifth response message is a response to the fifth request message; Among them, the terminal device camps on the first access network device, and the coverage range of the first access network device is larger than that of the second access network device.

61. A communication device, characterized in that, Applied to the second core network device, the apparatus includes: a receiving module, configured to receive a fifth request message sent by the first core network device, where the fifth request message is used to indicate a request to create a context of a terminal device; a sending module, configured to send a fifth response message to the first core network device, where the fifth response message is a response to the fifth request message; Among them, the terminal device camps on the first access network device, and the coverage range of the first access network device is larger than that of the second access network device.

62. A terminal device, characterized in that, Includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method according to any one of claims 1 to 7.

63. An access network device, characterized in that, Includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method according to any one of claims 8 to 39.

64. A core network device, characterized in that, Includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method according to any one of claims 40 to 56.

65. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the method according to any one of claims 1 to 56.

66. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method according to any one of claims 1 to 56.

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