System transmission method, device, terminal device, chip and storage medium

Abstract

The present application discloses a system transmission method, apparatus, terminal device, chip, and storage medium. The method includes: determining a first system set, where the first system set includes at least one first system and at least one second system, the first system being the system currently supported by the terminal device, and the second system being the system to be supported by the terminal device; and sending first information in the first system, the first information being used to indicate the first system set.

Description

Technical Field

[0001] Embodiments of the present application relate to, but are not limited to, the field of communication technologies, and in particular, to a system transmission method, apparatus, terminal device, chip, and storage medium. Background Art

[0002] With the rapid development of communication standards and the diversification of terminals, the systems supported by terminals are becoming increasingly rich. Starting from the earliest Global System for Mobile Communications (GSM) mobile phones, it has evolved into 2G / 3G dual-mode, 2G / 3G / 4G multi-mode, etc. Coupled with the systems of the 3rd Generation Partnership Project 2 (3GPP2), and now developed to 5G, the systems supported by terminals are becoming more and more abundant.

[0003] In related technologies, the systems supported by a terminal device are configured before the terminal device leaves the factory, and during the use of the terminal device, the systems supported by the terminal device cannot be modified. Summary of the Invention

[0004] Embodiments of the present application provide a system transmission method, apparatus, terminal device, chip, and storage medium.

[0005] In a first aspect, an embodiment of the present application provides a system transmission method applied to a terminal device, including:

[0006] Determine a first system set, where the first system set includes at least one first system and at least one second system, the first system is the system currently supported by the terminal device, and the second system is the system to be supported by the terminal device;

[0007] Send first information in the first system, where the first information is used to indicate the first system set.

[0008] In a second aspect, an embodiment of the present application provides a wireless communication device, including:

[0009] A determination unit, configured to: determine a first system set, where the first system set includes at least one first system and at least one second system, the first system is the system currently supported by the terminal device, and the second system is the system to be supported by the terminal device;

[0010] A communication unit, configured to: send first information in the first system, where the first information is used to indicate the first system set.

[0011] In a third aspect, an embodiment of the present application provides a terminal device, including: a processor and a memory,

[0012] The memory stores a computer program that can run on the processor;

[0013] When the processor executes the program, the method described in the first aspect is implemented.

[0014] In a fourth aspect, an embodiment of the present application provides a chip, including: a processor, configured to call and run a computer program from a memory to execute the method described in the first aspect.

[0015] In a fifth aspect, an embodiment of the present application provides a computer storage medium, where the computer storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the method described in the first aspect.

[0016] In the embodiment of the present application, a first set of radio access technologies (RATs) is determined. The first set of RATs includes at least one first RAT and at least one second RAT. The first RAT is the RAT currently supported by the terminal device, and the second RAT is the RAT to be supported by the terminal device. The first information is sent on the first RAT, and the first information is used to indicate the first set of RATs. In this way, the terminal device sends the first information indicating the first set of RATs on the RAT currently supported by the terminal device, and the terminal device can synchronize the new first set of RATs to the network device corresponding to the first RAT, so that the terminal device can change the supported set of RATs, improving the diversity of the RAT combinations of the terminal device. In addition, since the terminal device can notify the new first set of RATs through the currently supported first RAT, the terminal device does not need to go through a deregistration process for deregistration and then notify the new first set of RATs through a registration process. Furthermore, the terminal device can notify the network device of the first set of RATs in a short time, and reduce the situation that the terminal device is in a long-time service-free state due to the long time consumed by the deregistration process. Description of the Drawings

[0017] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application, and do not constitute an improper limitation of the present application.

[0018] Figure 1 A flowchart of a method for changing a set of RATs provided for the related art;

[0019] Figure 2 A flowchart of a method for RAT transmission provided for an embodiment of the present application;

[0020] Figure 3 A flowchart of another method for RAT transmission provided for an embodiment of the present application;

[0021] Figure 4Schematic flowchart of another system transmission method provided by an embodiment of the present application;

[0022] Figure 5 Schematic flowchart of yet another system transmission method provided by an embodiment of the present application;

[0023] Figure 6 Schematic flowchart of a method for changing a system set provided by an embodiment of the present application;

[0024] Figure 7 Schematic flowchart of a system transmission method provided by an embodiment of the present application;

[0025] Figure 8 Schematic structural diagram of a wireless communication device provided by an embodiment of the present application;

[0026] Figure 9 Schematic structural diagram of a terminal device provided by an embodiment of the present application;

[0027] Figure 10 Schematic structural diagram of a chip provided by an embodiment of the present application. Detailed implementation manners

[0028] The technical solutions of the present application will be described in detail below through embodiments in combination with the accompanying drawings. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0029] It should be noted that in the examples of the present application, "first", "second", etc. are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0030] In addition, the technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0031] In some implementation scenarios, users have diverse requirements for the system of the terminal device. For example, when roaming in different countries, in order to reduce power consumption, there may be a need to turn off or on certain systems. In other implementation scenarios, as the forms of terminal devices are increasing, the test requirements for corresponding terminal devices are also becoming more diverse. Users or testers can independently set the modes supported by the terminal. Among all the systems supported by the terminal device, one or more systems can be arbitrarily selected and set to a single mode or a new multi-mode.

[0032] In the related art, the method for updating the supported network modes of a terminal device is as follows: the terminal device goes through the process of deregistration and then re-registration to complete the update of the network mode. In some cases, users or testers are only allowed to change the network mode when the terminal device is powered off or in flight mode.

[0033] However, for a terminal device supporting single-mode, dual-mode, or multi-mode capabilities, when a new set of network modes needs to be set, the deregistration method is often used. For example, the process for a terminal device to update the currently supported network modes is as follows: the terminal device deregisters the old network modes it currently supports through the deregistration process, and then registers to the new network modes through the registration process. However, this method has some drawbacks: on the one hand, the entire setting process takes a relatively long time and the execution efficiency is not high; on the other hand, because the deregistration process is required, that is, from the moment the terminal device initiates the deregistration process until it registers to the new network modes, the terminal device is in a state of no service, so incoming calls initiated by the network may be missed during the deregistration period.

[0034] In some embodiments, if the set of network modes supported by the maximum capability of the terminal device is A, B, C, D, E, and F, the currently configured set of network modes of the terminal device, radio access technology (RAT)_configuration (CONFIG)_1, includes network modes A, B, and C, and the terminal device has successfully camped on network mode A. When the set of network modes of the terminal device needs to be reset to RAT_CONFIG_2, where RAT_CONFIG_2 includes network modes D, E, and F. The set of network modes supported by the maximum capability of the terminal device may be determined by the terminal device according to pre-configuration, or may be configured by a network device. Then the related art process is as follows:

[0035] Figure 1 A schematic flow diagram of a method for changing a set of network modes provided by the related art is shown in Figure 1 As described, the method includes:

[0036] S101. The terminal device completes registration on the network corresponding to the currently camped network mode A.

[0037] During the registration process, the terminal device may send information indicating that the terminal device supports network modes A, B, and C to the network device corresponding to the currently camped network mode A.

[0038] In this way, the core network device corresponding to standard A (i.e., the core network device in the network device corresponding to standard A) can determine that the standards supported by the terminal device are standards A, B, and C. Among them, the core network device corresponding to standard A can support standard A, and the core network device corresponding to standard A can be connected to the core network devices corresponding to other standards through an interface, so as to notify the core network devices corresponding to other standards through the interface that the standards supported by the terminal device are standards A, B, and C, and / or, notify the context information generated during the interaction between the terminal device and the network device corresponding to standard A, and the core network devices corresponding to other standards can implement the terminal device switching from the cell corresponding to standard A to the cell corresponding to other standards according to the context information. Among them, other standards may include at least one of standards B, C, D, E, and F. In some embodiments, when the terminal device reselects or switches to a cell of other standards, the terminal device may not send the standard currently supported by the terminal device to the network devices of other standards. In other embodiments, when the terminal device reselects or switches to a network of other standards, the terminal device may not perform the initial registration process.

[0039] In the case where the terminal device supports standards A, B and C, the standard used by the terminal device can be switched among standards A, B and C during the use of the terminal device.

[0040] S102. At time t1, the terminal device determines to change the currently supported standard to standards D, E and F.

[0041] During the implementation process, the terminal device is not synchronized with the network state, which may cause some services, especially called services, to be affected. For example, the terminal device locally changes the standard set it supports from A, B and C to D, E and F, and does not synchronize the updated standard of the terminal device to D, E and F with the network device, that is, the network device still believes that the standards supported by the terminal device are A, B and C. Since the frequency bands of different standards are different, the standard used by the network device to send paging to the terminal device is one of D, E and F. Since the terminal device has modified the standard it supports locally, the terminal device uses one of the standards A, B and C to monitor paging. Therefore, the frequency band used by the network device to send paging is different from the frequency band used by the terminal device to monitor paging, so the terminal device cannot monitor the paging sent by the network device, which in turn affects the called services of the terminal device. In this way, when the terminal device changes the old standard set (the standard corresponding to the current standard) to the new standard set (the standard to be supported), it is necessary to keep its own state synchronized with the network state. The synchronization process is shown in S103-S106.

[0042] S103: The terminal device initiates a deregistration process to the network device corresponding to the currently resident system A, and completes the deregistration process.

[0043] S104. At time t2, the terminal device refreshes the capabilities and context information of each layer according to the supported radio access technologies D, E, and F.

[0044] In some embodiments, the terminal device may locally store the configuration information of radio access technologies A, B, C, D, E, and F for each layer (also referred to as the radio access technology configuration information of each layer). In some embodiments, when radio access technologies A, B, and C are activated or can be invoked, the radio access technologies currently supported by the terminal device are radio access technologies A, B, and C, and the capabilities of each layer of the terminal device are the capabilities corresponding to radio access technologies A, B, and C; when radio access technologies D, E, and F are activated or can be invoked, the radio access technologies currently supported by the terminal device are radio access technologies D, E, and F, and the capabilities of each layer of the terminal device are the capabilities of each layer corresponding to radio access technologies D, E, and F, or the capability information of each layer of the terminal device is the capability information of each layer corresponding to radio access technologies D, E, and F.

[0045] In some embodiments, the terminal device refreshing the capabilities of each layer includes: the terminal device deactivates radio access technologies A, B, and C and activates radio access technologies D, E, and F, or the terminal device sets radio access technologies A, B, and C to be unable to be invoked and sets radio access technologies D, E, and F to be able to be invoked. In this case, the radio access technologies currently supported by the terminal device are modified from radio access technologies A, B, and C to radio access technologies D, E, and F. Correspondingly, the capabilities of each layer of the terminal device are the capabilities corresponding to radio access technologies D, E, and F. In other embodiments, the terminal device refreshing the capabilities of each layer includes: the terminal device may delete the configuration information of radio access technologies A, B, and C in each layer and add the configuration information of radio access technologies D, E, and F in each layer.

[0046] In some embodiments, the context information may be stored in the terminal device, and the context information is information obtained during the interaction between the terminal device and the network device corresponding to at least one of the systems A, B, and C, including the information sent by the terminal device to the network device and / or the information sent by the network device to the terminal device. The context information may include two parts. One part is the fixed parameters configured by the network device for the terminal device, and the fixed parameters can still be used when the terminal device switches from one system to another. For example, the fixed parameters may include at least one of the following: Globally Unique Temporary UE Identity (GUTI), International Mobile Subscriber Identification Number (IMSI), etc. The other part is the variable parameters, and the variable parameters cannot be used when the terminal device switches from one system to another because the network device of the other system will reconfigure new parameters for the terminal device. The variable parameters may include the radio capabilities information of the terminal device, and the radio capabilities information may include at least one of the following information: the frequency bands supported by the terminal device, radio frequency parameters, uplink and downlink reception capabilities, etc. In some embodiments, the terminal device refreshing the context information may include the terminal device refreshing the context information of each layer. In some embodiments, the terminal device refreshing the context information of each layer may include: the terminal device deleting the variable parameters in each layer. In other embodiments, the network device corresponding to the other system may reassign the fixed parameters to the terminal device. Therefore, the terminal device refreshing the context information of each layer may include: the terminal device deleting the context information of each layer, or rather, the terminal device deleting the variable parameters and the fixed parameters in each layer.

[0047] In any embodiment of the present application, the capabilities of each layer are represented by the configuration information of each layer, enabling the terminal device to support the capabilities of the system.

[0048] S105. At time t3, the terminal device successfully changes the system.

[0049] In S105, the terminal device successfully changing the system may include: the terminal device successfully changing the system locally. However, when the terminal device successfully changes the system locally, it needs to synchronize the systems to be supported to the network device. Therefore, in the related art, the terminal device synchronizes the systems to be supported to the network device through S106 and S107.

[0050] S106. The terminal device performs network search according to the systems D, E, and F to be supported and camps on one of the systems D, E, and F.

[0051] Among them, the time when the terminal device camps on one of the systems D, E, and F is time t4.

[0052] S107. The terminal device registers according to one of the resident radio access technologies D, E, and F.

[0053] The moment when the terminal device completes the registration of one of the radio access technologies D, E, and F is time t5. For example, when the terminal device camps on radio access technology D, the terminal device registers through radio access technology D. During the registration process, the terminal device sends to the network device corresponding to radio access technology D that the radio access technologies currently supported by the terminal device are D, E, and F.

[0054] In Figure 1 When the terminal device needs to change the radio access technologies it currently supports, for example, when the terminal device needs to change the radio access technologies it currently supports from radio access technologies A, B, and C to radio access technologies D, E, and F, first the terminal device initiates an explicit deregistration process on radio access technology A. For example, the terminal device completes deregistration by sending a specific request message (such as a Deregistation Request) to the network device, referring to the time period t1 - t2; then refreshes the capabilities of each layer and the context information of each layer (such as radio capabilities information) according to the latest set of radio access technologies (that is, including radio access technologies D, E, and F), referring to the time period t2 - t3; then according to the new set of radio access technologies, selects a radio access technology with a high priority for network search and successfully registers, referring to the time period t3 - t5.

[0055] From Figure 1 It can be seen that in the related art, the terminal device is at least in a service - free state between time t1 and t4. In the service - free state, the terminal device can at least not handle incoming call services in the downlink.

[0056] Embodiments of the present application propose a method for avoiding explicit deregistration to complete this process and minimizing or completely eliminating the impact on incoming call services when a new set of radio access technologies needs to be reset for a multi - mode terminal (or multi - radio - access - technology terminal).

[0057] The radio access technology in any embodiment of the present application can be referred to as concepts such as network radio access technology or communication radio access technology, which are common technical terms for those skilled in the art. Different radio access technologies in any embodiment of the present application can correspond to different systems. For example, radio access technology A corresponds to system A, radio access technology B corresponds to system B, and so on. Another example is that the 5G radio access technology corresponds to the 5G system, and the 4G radio access technology corresponds to the 4G system. Embodiments of the present application do not list them one by one.

[0058] Radio access technology A in any embodiment of the present application can be referred to as A radio access technology, radio access technology B can be referred to as B radio access technology, and so on. Embodiments of the present application do not list them one by one.

[0059] The terminal device in this application may be referred to as User Equipment (UE), Mobile Station (MS), Mobile Terminal (MT), user unit, user station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The electronic device here may include one of the following or a combination of at least two of them: Internet of Things (IoT) device, satellite terminal, Wireless Local Loop (WLL) station, Personal Digital Assistant (PDA), handheld device with wireless communication function, computing device or other processing device connected to a wireless modem, server, mobile phone, tablet (Pad), computer with wireless transceiver function, palmtop computer, desktop computer, personal digital assistant, portable media player, smart speaker, navigation device, smart watch, smart glasses, wearable devices such as smart necklace, pedometer, digital TV, Virtual Reality (VR) terminal device, Augmented Reality (AR) terminal device, wireless terminal in industrial control, wireless terminal in self driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, and vehicles, in-vehicle devices, in-vehicle modules, wireless modems, handheld devices, Customer Premise Equipment (CPE), smart home appliances, etc. in the vehicle networking system.

[0060] The network device in the implementation of this application may include access network device and core network device.

[0061] Among them, the access network device is a network - side device that communicates wirelessly with the terminal device. For example, the access network device may include at least one of the following: an evolved base station (eNB or eNodeB) in a Long Term Evolution (LTE) system, a Next Generation Radio Access Network (NG RAN) device, a base station (gNB) in an NR system, a base station in a 6G system, a small station, a micro - station, a radio controller in a Cloud Radio Access Network (CRAN), an access point of Wireless - Fidelity (Wi - Fi), a transmission reception point (TRP), a relay station, an access point, a vehicle - mounted device, a wearable device, a hub, a switch, a bridge, a router, a network device in a future - evolved Public Land Mobile Network (PLMN), etc.

[0062] Among them, the core network device may be a core network device corresponding to 4G, 5G or other standards. The core network device corresponding to the 4G standard may be called an Evolved Packet Core (EPC) device, and the core network device corresponding to the 5G standard may be called a 5G Core (5GC) device. The devices included in the core network device corresponding to 4G, 5G or other standards may refer to relevant technologies outside the embodiments of this application, and this application does not list them one by one.

[0063] In the embodiments of this application, standards A, B, C, D, E, F, etc. represent a certain standard, and different letters represent different standards. For example, standard A may represent the 5G standard, and standard B may represent the 3G standard, etc.

[0064] Figure 2 It is a schematic flowchart of a standard transmission method provided by the embodiments of this application. As Figure 2 shown, this method is applied to a terminal device, and this method includes:

[0065] S201. Determine a first standard set, where the first standard set includes at least one first standard and at least one second standard. The first standard is the standard currently supported by the terminal device, and the second standard is the standard to be supported by the terminal device.

[0066] In some embodiments, the first standard set may include at least one standard.

[0067] In some embodiments, the currently supported radio access technology (RAT) of the terminal device may be at least partially the same as the RAT to be supported by the terminal device. For example, if the currently supported RAT of the terminal device includes RAT A, and the RAT to be supported by the terminal device includes RAT A. In some other embodiments, any RAT in the currently supported RAT of the terminal device may be different from any RAT in the RAT to be supported by the terminal device, that is, the currently supported RAT of the terminal device may have no intersection with the RAT to be supported by the terminal device.

[0068] In some embodiments, the currently supported RAT may be referred to as the legacy RAT or legacy RAT set, and / or the RAT to be supported may be referred to as the new RAT or new RAT set.

[0069] In some embodiments, at least one first RAT in the first RAT set may be at least partially the same as at least one second RAT in the first RAT set. For example, both at least one first RAT and at least one second RAT include RAT A, or it can be said that both the currently supported RAT and the RAT to be supported by the terminal device may include RAT A. In some embodiments, when both at least one first RAT and at least one second RAT include RAT A, the first RAT set includes one RAT A. It can be understood that in some scenarios, the first RAT and the second RAT in the first RAT set may be the same RAT. In some other embodiments, in the first RAT set, any RAT in at least one first RAT may be different from any RAT in at least one second RAT, that is, at least one first RAT may have no intersection with at least one second RAT.

[0070] In some embodiments, the currently supported RAT of the terminal device may be one RAT or multiple RATs. In some embodiments, at least one first RAT may be the same as the currently supported RAT of the terminal device. In some other embodiments, at least one first RAT may be selected from the currently supported RAT of the terminal device. For example, when the currently supported RAT of the terminal device is RAT A, B, and C, at least one first RAT may include at least one of RAT A, B, and C.

[0071] In some embodiments, the currently supported RAT of the terminal device may be the RAT that the terminal device has indicated to the network device. The RAT to be supported by the terminal device may be the RAT that the terminal device has not indicated to the network device. When the terminal device changes from the currently supported RAT to the RAT to be supported, the terminal device needs to send the RAT to be supported to the network device.

[0072] In some embodiments, at least one first radio access technology (RAT) may include the RAT where the terminal device is currently camped. In any embodiment of the present application, the RAT where the terminal device is currently camped may include: when the terminal device needs to change the currently supported RATs, the RAT where the terminal device is currently camped. For example, the user may trigger the terminal device to update the set of supported RATs it supports, that is, switch from the old set of RATs to the new set of RATs. For another example, the terminal device may update the set of supported RATs according to a request or instruction received from another device. Exemplarily, the above-mentioned another device may be a network device or other terminal device, and the request or instruction may indicate the RATs to be supported.

[0073] In some embodiments, the RATs to be supported by the terminal device may be one RAT or multiple RATs. In some embodiments, at least one second RAT may be the same as the RATs to be supported by the terminal device. In other embodiments, at least one second RAT may be selected from the RATs to be supported by the terminal device. For example, when the RATs to be supported by the terminal device are RAT A, D, and E, at least one second RAT may include at least one of RAT A, D, and E.

[0074] In some embodiments, the currently supported RATs may be the RATs before the RAT update. In some embodiments, the RATs to be supported may be the RATs after the RAT update, or the RATs to be supported may be the other RATs in the RATs after the RAT update except the currently supported RATs.

[0075] For example, when the terminal device wants to update the RATs from RAT A, B, and C to RAT A, D, and E, RAT A, B, and C may be referred to as the RATs before the RAT update, that is, the currently supported RATs, and RAT A, D, and E may be referred to as the RATs after the RAT update, that is, the RATs to be supported. And at least one first RAT in the first RAT set may be at least one of RAT A, B, and C, and at least one second RAT in the first RAT set may be at least one of RAT A, D, and E. It should be noted that when at least one first RAT includes RAT A and at least one second RAT includes RAT A, the first RAT set includes one RAT A.

[0076] In some embodiments, the first set of radio access technologies (RATs) may include: one first RAT and all the to-be-supported RATs. The one first RAT may be any RAT among the RATs currently supported by the terminal device. Exemplarily, the one first RAT may be the RAT on which the terminal device is currently camped. Additionally, the one first RAT may be the RAT with the highest priority among the RATs currently supported by the terminal device. Further, the one first RAT may be another RAT other than the RAT on which the terminal device is currently camped among the RATs currently supported by the terminal device. For example, the one first RAT may not be the currently camped RAT, but is a RAT that overlaps between the currently supported RATs and the to-be-supported RATs. For example, the RATs currently supported by the terminal device are RAT A, RAT B, and RAT C, the currently camped RAT is RAT A, the to-be-supported RATs are RAT B, RAT D, and RAT E, and the one first RAT included in the first set of RATs is RAT B.

[0077] In some other embodiments, the first set of RATs may include: one first RAT and one second RAT. The one second RAT may be the RAT with the highest priority among at least one second RAT.

[0078] In some other embodiments, the first set of RATs may include all the currently supported RATs and the to-be-supported RATs (or all the to-be-supported RATs). It should be noted that the first set of RATs does not include overlapping RATs.

[0079] In some embodiments, the priority of at least one first RAT and / or at least one second RAT may be pre-configured by the terminal device (e.g., configured at the factory of the terminal device, or determined by the user triggering the terminal device through an operation), or may be sent to the terminal device by another device, or may be configured for the terminal device by a network device.

[0080] In any embodiment of the present application, the types of the other device and the terminal device may be the same or different. For example, the other device and the terminal device may both be mobile phones, or the other device may be a server and the terminal device may be a mobile phone. The type of the other device may refer to the description of the terminal device above and will not be elaborated here.

[0081] S202. Send first information in the first RAT, where the first information is used to indicate the first set of RATs.

[0082] In some embodiments, the terminal device synchronizes, to the network device, the set of supported radio access technologies (RATs) as a first set of RATs by sending first information in the first RAT. In some embodiments, the first information may include the identifier or field of each RAT in the first set of RATs, so that the network device can determine that the set of supported RATs of the terminal device is the first set of RATs based on the identifier or field of each RAT in the first set of RATs. In this way, by sending the first set of RATs to the network device, the network device can determine that the set of supported RATs of the terminal device is the first set of RATs.

[0083] In some embodiments, the first RAT in S202 may be any one of at least one first RAT. For example, the first RAT in S202 may be one of the first RATs included in the first set of RATs. Exemplarily, the first RAT in S202 may be the RAT in which the terminal device is currently camped. Additionally, the first RAT in S202 may be the RAT with the highest priority among the RATs currently supported by the terminal device. Further, the first RAT in S202 may be another RAT other than the RAT in which the terminal device is currently camped among the RATs currently supported by the terminal device. Additionally, the first RAT in S202 may be a RAT that overlaps with the RAT to be supported among the RATs currently supported by the terminal device.

[0084] In the embodiments of the present application, the first set of RATs indicated to the network device includes the first RAT in S202. For example, when the first RAT in S202 includes the RAT in which the terminal device is currently camped, the first set of RATs includes the RAT in which the terminal device is currently camped.

[0085] In some implementation scenarios, the RATs currently supported by the terminal device (i.e., the RATs before the update) are A, B, and C, and the terminal device is camped on RAT A (corresponding to the first RAT in S202). If the terminal device needs to change the supported RATs to RATs A, D, and E (i.e., the RATs after the update or the RATs to be supported), the terminal device sends first information in RAT A, and the first information is used to indicate that the first set of RATs is RATs A, D, and E. Further, in some implementation scenarios, if RAT A has the highest priority among RATs A, D, and E, the terminal device can remain camped on the cell corresponding to RAT A. If RAT A does not have the highest priority among RATs A, D, and E, the terminal device can switch to the cell corresponding to the RAT with the highest priority among RATs A, D, and E. In other embodiments, the first information is used to indicate that the first set of RATs is RATs A, B, C, D, and E.

[0086] In some other implementation scenarios, the currently supported radio access technologies (i.e., the radio access technologies before the update) of the terminal device are A, B, and C, and the terminal device camps on radio access technology A (corresponding to the first radio access technology in S202). If the terminal device needs to change the supported radio access technologies to radio access technologies D, E, and F (i.e., the radio access technologies after the update or the radio access technologies to be supported), the terminal device sends a first message in radio access technology A. The first message is used to indicate that the first set of radio access technologies is radio access technologies A, D, E, and F. In other embodiments, the first message is used to indicate that the first set of radio access technologies is radio access technologies A, B, C, D, E, and F.

[0087] In still some other implementation scenarios, the currently supported radio access technologies (i.e., the radio access technologies before the update) of the terminal device are A, B, and C, and the terminal device camps on radio access technology B. If the terminal device needs to change the supported radio access technologies to radio access technologies A, D, and E (i.e., the radio access technologies after the update or the radio access technologies to be supported), the terminal device sends a first message in radio access technology B. The first message is used to indicate that the first set of radio access technologies is radio access technologies A, B, D, and E.

[0088] In yet some other implementation scenarios, the currently supported radio access technologies (i.e., the radio access technologies before the update) of the terminal device are A, B, and C, and the terminal device camps on radio access technology B. If the terminal device needs to change the supported radio access technologies to radio access technologies A, D, and E (i.e., the radio access technologies after the update or the radio access technologies to be supported), since both the currently supported radio access technologies and the radio access technologies to be supported include radio access technology A, the terminal device can first switch to the network corresponding to radio access technology A, and then send a first message in radio access technology A (corresponding to the first radio access technology in S202). The first message is used to indicate that the first set of radio access technologies is radio access technologies A, D, and E.

[0089] In some embodiments, the terminal device may send the first message in the first radio access technology through the signaling in the registration procedure, or through the signaling in the attachment procedure, or the signaling corresponding to other radio access technologies (such as the 6G radio access technology). For example, when the first radio access technology is the 5G radio access technology, the first message may be included in the registration request or the mobility registration updating (MRU) request in the registration procedure. For another example, the first message may be included in other messages in the registration procedure except the registration request or the MRU request. For example, when the first radio access technology is the 4G radio access technology, the first message may be included in the tracking area update (TAU) request in the attachment procedure. For another example, the first message may be included in other messages in the attachment request except the tracking area update request. Exemplarily, the first message may be included in the capability information, which is the information fed back by the terminal device to the network device after receiving the capability query message sent by the network device. In some other embodiments, the first message may be sent to the network device after the registration procedure or the attachment procedure ends.

[0090] In some embodiments, the first information may be a separate signaling, or the first information and other information may be carried in the same signaling. For example, the first information may be included in an MRU request or a TAU request, and the MRU request or TAU request may further include information such as security parameters and / or access parameters.

[0091] In some embodiments, the terminal device may send the first information to the network device corresponding to the first radio access technology (RAT). For example, the terminal device may send the first information to an Access and Mobility Management Function (AMF) network element, or the terminal device may send the first information to the AMF network element through an access network device. The network device corresponding to the first RAT may be: an access network device corresponding to the first RAT and / or a core network device corresponding to the first RAT. In some implementation scenarios, if the first RAT is the 5G RAT, the core network device in the network device corresponding to the first RAT may be the core network device corresponding to the 4G RAT, and the access network device may be the access network device corresponding to the 5G RAT; or, the core network device in the network device corresponding to the first RAT may be the core network device corresponding to the 5G RAT, and the access network device is the access network device corresponding to the 4G RAT; or, the core network device in the network device corresponding to the first RAT may be the core network device corresponding to the 5G RAT, and the access network device is the access network device corresponding to the 5G RAT.

[0092] In the embodiments of the present application, a first RAT set is determined, where the first RAT set includes at least one first RAT and at least one second RAT. The first RAT is the RAT currently supported by the terminal device, and the second RAT is the RAT to be supported by the terminal device; the first information is sent in the first RAT, and the first information is used to indicate the first RAT set. In this way, the terminal device sends the first information indicating the first RAT set in the currently supported RAT, and the terminal device can synchronize the new first RAT set to the network device corresponding to the first RAT, so that the terminal device can change the supported RAT set, improving the diversity of the RAT combination of the terminal device; in addition, since the terminal device can notify the new first RAT set through the currently supported first RAT, the terminal device does not need to perform deregistration through the deregistration process and then notify the new first RAT set through the registration process. Furthermore, the terminal device can notify the first RAT set to the network device in a short time, and reduce the situation that the terminal device is in a long-time service-free state due to the long time consumed by the deregistration process.

[0093] It can be understood that before the terminal device sends the first set of radio access technologies (RATs), it is necessary to update the configuration information corresponding to the RATs in the terminal device (for example, the configuration information of each layer or the RAT configuration information of each layer), and / or update the context information corresponding to the RATs in the terminal device (for example, the context information of each layer). Updating the configuration information and / or context information corresponding to the RATs may include: deleting the RATs that belong to the old set of RATs and do not belong to the new set of RATs, and adding the RATs that belong to the new set of RATs and do not belong to the old set of RATs; wherein, the embodiments of the present application do not limit the order of deletion and addition.

[0094] In some embodiments, the implementation manner of updating the configuration information and / or context information corresponding to the RATs in the terminal device may refer to the related description of refreshing the capabilities and context information of each layer in S104.

[0095] In a possible implementation manner, if at least one of the first RATs includes at least one of the second RATs, the configuration information and / or context information of the current RAT of the terminal device may be maintained. If any of the second RATs in at least one of the second RATs does not belong to the currently supported RATs, the terminal device may first add the configuration information and / or context information corresponding to the any second RAT, and then send the first information.

[0096] If any of the first RATs in at least one of the first RATs does not belong to the to-be-supported RATs, in one implementation manner, the terminal device may delete the configuration information and / or context information corresponding to the any first RAT, and then send the first information. In another implementation manner, the terminal device may first send the first information, and then delete the configuration information and / or context information corresponding to the any first RAT.

[0097] In some embodiments, before sending the first information in the first RAT, it further includes: updating the configuration information of the RAT of the terminal device to the configuration information of the RATs in the first set of RATs.

[0098] In other embodiments, before sending the first information in the first RAT, it further includes: updating the context information of the RAT of the terminal device to the context information of the RATs in the first set of RATs.

[0099] In still other embodiments, before sending the first information in the first RAT, it further includes: updating the configuration information of the RAT of the terminal device to the configuration information of the RATs in the first set of RATs; and updating the context information of the RAT of the terminal device to the context information of the RATs in the first set of RATs.

[0100] Exemplarily, when the currently supported radio access technologies (RATs) are RAT A, B, and C, and the first set of RATs is A, D, and E, the terminal device may delete the configuration information and / or context information of RAT B and C, and add the configuration information and / or context information of RAT D and E, where the order of deletion and addition is not limited.

[0101] In any embodiment of the present application, the configuration information of a RAT may be referred to as the capability information of the RAT. When the terminal device has the capability information of a certain RAT, the terminal device can use the network of that RAT. For example, the configuration information of the 5G RAT may be referred to as the capability information of the 5G RAT. In this way, since the terminal device has the capability information of the 5G RAT, when the terminal device camps on a 5G cell, it can use the 5G network. In any embodiment of the present application, the configuration information of a RAT may be referred to as the configuration information of the RAT at each layer, and the capability information of the RAT may be referred to as the capability information of the RAT at each layer.

[0102] In some embodiments, updating the configuration information of the RATs of the terminal device to the configuration information of the RATs in the first set of RATs may include: updating the configuration information of each layer corresponding to the RATs of the terminal device to: the configuration information of each layer corresponding to each RAT in the first set of RATs. For example, if the currently supported RATs include RAT A, B, and C, and the first set of RATs includes RAT A, D, and E, then the configuration information of each layer corresponding to the RATs of the terminal device may be updated from the configuration information of each layer corresponding to each of RAT A, B, and C to the configuration information of each layer corresponding to each of RAT A, D, and E. In this way, the terminal device can communicate with the network corresponding to the first set of RATs through the configuration information of the RATs in the first set of RATs. Exemplarily, since the frequency bands corresponding to the 5G RAT and the 4G RAT are different, the configuration information of the 5G RAT and the 4G RAT corresponding to the physical layer is different.

[0103] In any embodiment of the present application, the configuration information of each layer may include Access Stratum (AS) configuration information and / or Non-Access Stratum (NAS) configuration information. The Non-Access Stratum may include at least one of the following: Physical Layer (PHY), Media Access Control (MAC) layer, Radio Link Control (RLC) layer, Packet Data Convergence Protocol (PDCP) layer, and Radio Resource Control (RRC) layer.

[0104] In some embodiments, the terminal device may store the configuration information of each layer corresponding to the maximum number of supported radio access technologies (RATs), and the multiple RATs include a first set of RATs. In other embodiments, the configuration information corresponding to each RAT in the first set of RATs may be sent by another device to the terminal device, or configured by a network device to the terminal device.

[0105] In some embodiments, updating the context information of the RAT of the terminal device to the context information of the RATs in the first set of RATs may include: updating the context of each layer corresponding to the RAT of the terminal device to the context of each layer corresponding to each RAT in the first set of RATs. The context information may be obtained based on the communication between the terminal device and the network device.

[0106] Figure 3 The following is a schematic flow chart of another RAT transmission method provided by an embodiment of the present application. As Figure 3 shown, this method is applied to a terminal device, and the method includes:

[0107] S301. Determine a first set of RATs, where the first set of RATs includes at least one first RAT and at least one second RAT. The first RAT is the RAT currently supported by the terminal device, and the second RAT is the RAT to be supported by the terminal device.

[0108] S302. Send a first message in the first RAT, where the first message is used to indicate the first set of RATs.

[0109] S303. Send a second message in the second RAT; the second message is used to indicate a second set of RATs, and the second set of RATs is the set of RATs to be supported.

[0110] In some embodiments, if the set of RATs to be supported includes the first RAT, the terminal device may directly send the first message in the first RAT to indicate the first set of RATs through the first message. At least one second RAT in the first set of RATs may include all the RATs to be supported, so as to synchronize the first set of RATs to the network device, so as to update the RAT set of the terminal device and synchronize the updated RAT set to the network device. In this case, the terminal device does not need to execute S303.

[0111] In other embodiments, if the set of RATs to be supported does not include the first RAT, the terminal device first sends the first message through the first RAT to synchronize the first set of RATs to the network device. Further, the terminal device camps on the cell corresponding to the second RAT, and then sends the second message through the second RAT to synchronize the second set of RATs to the network device, so as to update the RAT set of the terminal device and synchronize the updated RAT set to the network device.

[0112] In some embodiments, S303 may include: when the terminal device camps on the second radio access technology (RAT), sending second information in the second RAT.

[0113] Wherein, the second RAT may be any one of the RATs to be supported by the terminal device. Exemplarily, the second RAT may be the RAT with the highest priority among the RATs to be supported by the terminal device.

[0114] In any embodiment of the present application, after sending the first information in the first RAT, the terminal device may deregister / detach from some RATs (the deregister / detach RATs include explicit deregister / detach RATs or implicit deregister / detach RATs). In the embodiments of the present application, the deregister / detach RATs are implicit deregister / detach RATs. In other embodiments, the deregister / detach RATs include explicit deregister / detach RATs, or a combination of explicit deregister / detach and implicit deregister / detach to deregister / detach the RATs. In the embodiments of the present application, the terminal device may perform implicit deregistration / detachment from the RATs after camping on the cell corresponding to the second RAT and before sending the second information in the second RAT. In some other embodiments, the terminal device may perform implicit deregistration / detachment from the RATs after sending the second information in the second RAT.

[0115] In any embodiment of the present application, after sending the first information in the first RAT, the terminal device may implicitly deregister / detach from the currently supported RATs and not for the to-be-supported RATs.

[0116] In this way, since the terminal device camps on the cell corresponding to the second RAT, paging can be monitored through the cell corresponding to the second RAT. At this time, it is no longer necessary to monitor paging through the RATs that belong to the currently supported RATs and do not belong to the to-be-supported RATs. Therefore, the terminal device can implicitly deregister / detach from the RATs that belong to the currently supported RATs and do not belong to the to-be-supported RATs, so as to synchronize the RAT reported by the terminal device to the network device through the second information with the RATs to be supported by the terminal device.

[0117] Exemplarily, when the currently supported RATs of the terminal device are RAT A, B, and C, the to-be-supported RATs of the terminal device are RAT D, E, and F, and the currently camped RAT of the terminal device is RAT A, the terminal device may send the first information in the first RAT, and the first information is used to indicate RAT A, D, E, and F (which may correspond to the above-mentioned first RAT set). Then the terminal device may camp on the cell corresponding to the second RAT (such as RAT D), and then send the second information in the second RAT, and the second information is used to indicate RAT D, E, and F (which may correspond to the above-mentioned second RAT set) to implement the update of the RAT set. Exemplarily, after the terminal device camps on the second RAT and before sending the second information in the second RAT, the terminal device may implicitly deregister from RAT A, B, and C.

[0118] Exemplarily, when the currently supported radio access technologies (RATs) of the terminal device are RAT A, B, and C, the RATs to be supported by the terminal device are RAT B, D, and E, and the currently camped RAT of the terminal device is RAT A, the terminal device may send a first message in a first RAT. The first message is used to indicate RAT A, B, D, and E (which may correspond to the above-mentioned first RAT set). Then the terminal device may camp on a cell corresponding to a second RAT (e.g., RAT B), and then send a second message in the second RAT. The second message is used to indicate RAT B, D, and E (which may correspond to the above-mentioned second RAT set) to implement the update of the RAT set. Exemplarily, after the terminal device camps on the second RAT and before sending the second message in the second RAT, the terminal device may implicitly deregister RAT A and C.

[0119] In some embodiments, the terminal device may send the second message in the second RAT through the signaling in the registration procedure, or through the signaling in the attachment procedure, or the signaling corresponding to other RATs (e.g., 6G RAT). For example, the second message may be included in the Registration Request or Mobility Registration Updating (MRU) Request in the registration procedure. For another example, the second message may be included in other messages other than the registration request in the registration procedure. For example, the second message may be included in the Tracking Area Update (TAU) Request in the attachment procedure. For another example, the second message may be included in other messages other than the tracking area update request in the attachment request. Exemplarily, the second message may be included in the capability information, which is the information fed back by the terminal device to the network device after receiving the capability query message sent by the network device. In some other embodiments, the second message may be sent to the network device after the registration procedure or the attachment procedure ends.

[0120] In some embodiments, the second message may be a separate signaling, or the second message and other information may be carried in the same signaling. For example, the second message may be included in the MRU Request or TAU Request, and the MRU Request or TAU Request may also include information such as security parameters and / or access parameters.

[0121] In some embodiments, the terminal device may send second information to a network device corresponding to a second radio access technology (RAT). For example, the terminal device may send the second information to an Access and Mobility Management Function (AMF) network element, or the terminal device may send the second information to the AMF network element via an access network device. The network device corresponding to the second RAT may be: an access network device corresponding to the second RAT and / or a core network device corresponding to the second RAT. In some implementation scenarios, if the second RAT is the 5G RAT, the core network device in the network device corresponding to the second RAT may be a core network device corresponding to the 4G RAT, and the access network device may be an access network device corresponding to the 5G RAT. Or, the core network device in the network device corresponding to the second RAT may be a core network device corresponding to the 5G RAT, and the access network device is an access network device corresponding to the 4G RAT. Or, the core network device in the network device corresponding to the second RAT may be a core network device corresponding to the 5G RAT, and the access network device is an access network device corresponding to the 5G RAT.

[0122] In some embodiments, before sending the second information in the second RAT, the method further includes: updating the configuration information of the RAT of the terminal device to the configuration information of the second RAT concentration.

[0123] In some other embodiments, before sending the second information in the second RAT, the method further includes: updating the context information of the RAT of the terminal device to the context information of the second RAT concentration.

[0124] In still some other embodiments, before sending the second information in the second RAT, the method further includes: updating the configuration information of the RAT of the terminal device to the configuration information of the second RAT concentration; and updating the context information of the RAT of the terminal device to the context information of the second RAT concentration.

[0125] Exemplarily, when the first RAT set is A, D, and E, and the RAT set to be supported is also A, D, and E, the first RAT set is the same as the RAT set to be supported. In this case, the terminal device does not need to update the configuration information and / or context information of the RAT anymore. Thus, the terminal device does not need to perform the step of updating the configuration information and / or context information of the RAT of the terminal device.

[0126] Another example is that the first RAT set is A, D, E, and F, and the RAT set to be supported is D, E, and F. The step of updating the configuration information and / or context information of the RAT of the terminal device includes: the terminal device may delete the configuration information and / or context information of RAT A.

[0127] In some embodiments, updating the configuration information of the mode of the terminal device to the configuration information of the modes in the second mode set may include: updating the configuration information of each layer corresponding to the mode of the terminal device to the configuration information of each layer corresponding to each mode in the second mode set.

[0128] In some embodiments, the terminal device may store the configuration information of each layer corresponding to the maximum number of supported modes, and the multiple modes include the second mode set. In some other embodiments, the configuration information corresponding to each mode in the second mode set may be sent by another device to the terminal device or configured by a network device for the terminal device.

[0129] In some embodiments, updating the context information of the mode of the terminal device to the context information of the modes in the second mode set may include: updating the context of each layer corresponding to the mode of the terminal device to the context of each layer corresponding to each mode in the second mode set.

[0130] Figure 4 The flowchart of another mode transmission method provided by the embodiments of the present application is shown as Figure 4 shown. This method is applied to a terminal device, and the method includes:

[0131] S401. Determine a first mode set, where the first mode set includes at least one first mode and at least one second mode, the first mode is the mode currently supported by the terminal device, and the second mode is the mode to be supported by the terminal device.

[0132] S402. Send first information in the first mode, where the first information is used to indicate the first mode set.

[0133] S403. When the terminal device is in a non-connected state, camp on a cell that supports the second mode.

[0134] In some embodiments, the non-connected state may include: an idle state (IDLE state) or an inactive state (INACTIVE state). In some embodiments, when the terminal device is in a non-connected state, it camps on a cell that supports the second mode through cell reselection or cell search. In this way, when the terminal device is in a non-connected state, the terminal device initiates a cell reselection or network search process to perform cell reselection or cell search, so that the terminal device camps on a cell that supports the second mode.

[0135] In any embodiment of the present application, the IDLE state may be the RRC_IDLE state, and the INACTIVE state may be the RRC_INACTIVE state.

[0136] S404. Send a second message in the second radio access technology (RAT); the second message is used to indicate a second RAT set, and the second RAT set is a set of RATs to be supported.

[0137] The following describes how the terminal device camps on a cell supporting the second RAT after the terminal device sends the first message in the first RAT and if the terminal device is in the connected state:

[0138] In some embodiments, when the terminal device is in the connected state, it switches to the non-connected state and camps on a cell supporting the second RAT through cell reselection.

[0139] In other embodiments, when the terminal device is in the connected state, it camps on a cell supporting the second RAT through inter-system handover.

[0140] The following describes the implementation manner of switching to the non-connected state when the terminal device is in the connected state:

[0141] In some implementation manners, when the currently camped cell supports non-critical radio bearer (NCR), a target request is sent in the first RAT, and the target request is used to indicate that the currently camped cell releases the radio resource control (RRC) connection with the terminal device; when the confirmation response corresponding to the target request is received, the terminal device switches to the non-connected state.

[0142] In this way, the terminal device sends a target request in the first RAT, and when the confirmation response corresponding to the target request is received, it switches to the non-connected state. In this way, when the network device corresponding to the currently camped cell receives the target request and determines that the terminal device will enter the non-connected state, it will no longer send downlink information to the terminal device, thus avoiding the situation where the terminal device releases the RRC connection by itself, but the network device does not know that the terminal device releases the RRC connection and still sends downlink information to the terminal device, resulting in the loss of downlink information, and improving the reliability of information transmission.

[0143] In some implementation manners, the target request is a tracking area update (TAU) request or a mobility related update (MRU) request, and the target request includes information indicating the reason for the NCR.

[0144] Among them, when the first RAT is the 4G RAT, the target request is a TAU request; when the first RAT is the 5G RAT, the target request is an MRU request.

[0145] For example, when the currently camped cell supports NCR, the network device corresponding to the currently camped cell may send indication information to the terminal device, and the indication information is used to indicate that the currently camped cell supports NCR.

[0146] Exemplarily, if it is not possible to switch to the disconnected state through other conditions, when the current resident cell supports NCR, send a target request in the first radio access technology (RAT); when the acknowledgment response corresponding to the target request is received, switch to the disconnected state.

[0147] In some embodiments, the step of sending a target request in the first RAT when the current resident cell supports NCR includes:

[0148] Send the target request in the first RAT when at least one of the following conditions is met and the current resident cell supports NCR:

[0149] The data radio bearer (DRB) and the protocol data unit (PDU) session / Evolved Packet System (EPS) bearer corresponding to the DRB are not released;

[0150] Send an inter-system event report in the first RAT and have not camped on the second RAT.

[0151] For example, if the first RAT is the 5G RAT, determine that the DRB and the PDU session corresponding to the DRB are not released, and / or if an inter-system event report is sent in the first RAT and the acknowledgment information corresponding to the inter-system event report is not received, then send a target request in the first RAT when the current resident cell supports NCR; when the acknowledgment response corresponding to the target request is received, switch to the disconnected state.

[0152] For another example, if the first RAT is the 4G RAT, determine that the DRB and the EPS bearer corresponding to the DRB are not released, and / or if an inter-system event report is sent in the first RAT and the acknowledgment information corresponding to the inter-system event report is not received, then send a target request in the first RAT when the current resident cell supports NCR; when the acknowledgment response corresponding to the target request is received, switch to the disconnected state.

[0153] In some other embodiments, before switching to the disconnected state, it further includes: determining that the DRB and the PDU session corresponding to the DRB are released, or the DRB and the EPS bearer corresponding to the DRB are released.

[0154] In some embodiments, before switching to the non-connected state, if the DRB and the PDU session / EPS bearer corresponding to the DRB are not released, the terminal device may determine whether the DRB and the PDU session / EPS bearer corresponding to the DRB are allowed to be released. If the release is allowed, the terminal device releases the DRB and the PDU session / EPS bearer corresponding to the DRB. If not, the terminal device fails to switch to the non-connected state, or the terminal device does not switch to the non-connected state.

[0155] In this way, when the terminal device is in the connected state, if it is determined that the data radio bearer DRB and the protocol data unit PDU session corresponding to the DRB have been released, or the DRB and the evolved packet system EPS bearer corresponding to the DRB have been released, the terminal device may switch to the non-connected state.

[0156] In some implementation cases, if the terminal device determines that the data radio bearer DRB and the protocol data unit PDU session corresponding to the DRB have been released, or the DRB and the evolved packet system EPS bearer corresponding to the DRB have been released, the terminal device may release the RRC connection with the currently resident cell and switch to the non-connected state.

[0157] In this way, if the terminal device determines that the data radio bearer DRB and the protocol data unit PDU session / EPS bearer corresponding to the DRB have been released, releases the RRC connection, and switches to the non-connected state. Thus, the terminal device can release the RRC connection and switch to the non-connected state by itself, without interacting with the network device corresponding to the currently resident cell of the terminal device, thereby reducing the time for the terminal device to switch to the non-connected state, enabling the terminal device to quickly enter the non-connected state, and then quickly camp on a cell supporting the second radio access technology, reducing the time when the terminal device is in a no-service state.

[0158] Exemplarily, if the terminal device cannot switch to the non-connected state through other conditions, and it is determined that the data radio bearer DRB and the protocol data unit PDU session / EPS bearer corresponding to the DRB have been released, the terminal device may switch to the non-connected state.

[0159] In some embodiments, when the currently resident cell does not support NCR, and / or when the inter-system event report is sent through the first radio access technology and the terminal device has not camped on the second radio access technology, if it is determined that the DRB and the PDU session corresponding to the DRB have been released, or the DRB and the EPS bearer corresponding to the DRB have been released, the terminal device may switch to the non-connected state.

[0160] For example, if the current serving cell does not support NCR, and / or if the first radio access technology (RAT) is 5G, when sending an inter-system event report in the first RAT and not receiving the corresponding acknowledgment information for the inter-system event report, the terminal device may switch to the disconnected state when it is determined that the data radio bearer (DRB) and the protocol data unit (PDU) session corresponding to the DRB have been released.

[0161] For another example, if the current serving cell does not support NCR, and / or if the first RAT is 4G, when sending an inter-system event report in the first RAT and not receiving the corresponding acknowledgment information for the inter-system event report, the terminal device may switch to the disconnected state when it is determined that the data radio bearer (DRB) and the evolved packet system (EPS) bearer corresponding to the DRB have been released.

[0162] In some other embodiments, the switching to the disconnected state includes: sending an inter-system event report in the first RAT; the inter-system event report is used to indicate a handover from the current serving cell to the cell supporting the second RAT; switching to the disconnected state when not receiving the corresponding acknowledgment information for the inter-system event report; the acknowledgment information is used to indicate a handover from the current serving cell to the cell supporting the second RAT.

[0163] In some embodiments, the inter-system event report may be a measurement-based report. For example, if the measurement result meets the inter-system handover condition, an inter-system event report is sent in the first RAT, and the inter-system event report may include the measurement result. For another example, if the measurement result does not meet the inter-system handover condition, the terminal device modifies the measurement result so that the modified measurement result meets the inter-system handover condition, and then the terminal device sends an inter-system event report in the first RAT, and the inter-system event report may include the modified measurement result. In some other embodiments, the inter-system event report may be a non-measurement-based report. For example, the terminal device directly sends an inter-system event report in the first RAT without performing measurements, and the inter-system event report may include a pre-configured result that meets the inter-system handover condition.

[0164] In some embodiments, before sending the inter-system event report in the first RAT, the method further includes: initiating an inter-system measurement for the first RAT.

[0165] In some embodiments, the inter-system event report may include or indicate at least one of the following events: A1 event, A2 event, A3 event, A4 event, A5 event, B1 event, B2 event, etc.

[0166] Among them, Event A1, Event A2, Event A3, Event A4, Event A5, Event B1, and Event B2 can correspond to A1 measurement report, A2 measurement report, A3 measurement report, A4 measurement report, A5 measurement report, B1 measurement report, and B2 measurement report respectively. The determination methods of each measurement report are described as follows:

[0167] When the reference signal receiving power (RSRP) value of the serving cell is higher than the absolute threshold, an A1 measurement report is output. Event A1 can be used to turn off certain inter-cell measurements.

[0168] When the RSRP value of the serving cell is lower than the absolute threshold, an A2 measurement report is output. Event A2 can be used to turn on certain inter-cell measurements because handover and other operations may occur after this event.

[0169] When the RSRP value of a neighboring cell is higher than the RSRP value of the serving cell, an A3 measurement report is output. The occurrence of Event A3 can be used to determine whether the UE should switch to the neighboring cell.

[0170] When the RSRP value of a neighboring cell is higher than the absolute threshold, an A4 measurement report is output.

[0171] When the RSRP value of the serving cell is lower than absolute threshold 1 and the RSRP value of a neighboring cell is higher than absolute threshold 2, an A5 measurement report is output. Event A5 can also be used to support handover.

[0172] When the RSRP value of an inter-system neighboring cell is higher than the absolute threshold, a B1 measurement report is output. Event B1 indicates that the quality of the inter-system neighboring cell is higher than a certain threshold. When this condition is met and the event is reported, the source base station initiates an inter-system handover request.

[0173] When the RSRP value of the serving cell is lower than absolute threshold 1 and the RSRP value of an inter-system neighboring cell is higher than absolute threshold 2, a B2 measurement report is output. Event B2 indicates that the quality of the serving cell is lower than a certain threshold and the quality of the inter-system neighboring cell is higher than a certain threshold.

[0174] In some embodiments, sending an inter-system event report in the first radio access technology includes: sending an inter-system event report in the first radio access technology when the current resident cell does not support NCR, and / or when the data radio bearer (DRB) and the PDU session / EPS bearer corresponding to the DRB are not released.

[0175] Wherein, if the first radio access technology (RAT) is 5G, an inter-system event report is sent in the first RAT when the current serving cell does not support non-standalone carrier aggregation (NCR), and / or when the data radio bearer (DRB) and the corresponding protocol data unit (PDU) session are not released. Wherein, if the first RAT is 4G, an inter-system event report is sent in the first RAT when the current serving cell does not support NCR, and / or when the DRB and the corresponding EPS bearer are not released.

[0176] In some embodiments, the non-receipt of the acknowledgement information corresponding to the inter-system event report includes: the non-receipt of the acknowledgement information corresponding to the inter-system event report within a first time period after the inter-system event report is sent.

[0177] The start time of the first time period may be the end time of sending the inter-system event report. The duration corresponding to the first time period may be preset by the terminal device, or configured by the network device, or predefined by the protocol.

[0178] In some embodiments, the non-receipt of the acknowledgement information corresponding to the inter-system event report within a first time period after the inter-system event report is sent includes: the terminal device starts a timer with a timing duration corresponding to the first time period at the end time of sending the inter-system event report, and the acknowledgement information corresponding to the inter-system event report is not received before the timer expires.

[0179] In some embodiments, when the acknowledgement information corresponding to the inter-system event report is not received, switching to the non-connected state includes: when the acknowledgement information corresponding to the inter-system event report is not received and the DRB and the corresponding PDU session / EPS bearer have been released, releasing the radio resource control (RRC) connection and entering the non-connected state.

[0180] In some embodiments, if the DRB and the corresponding PDU session / EPS bearer are not released, the terminal device may determine whether the DRB and the corresponding PDU session / EPS bearer are allowed to be released. If allowed, the terminal device may release the DRB and the corresponding PDU session / EPS bearer, and release the RRC connection to enter the non-connected state.

[0181] In some implementation processes, when the terminal device does not receive the confirmation information corresponding to the inter-system event report, it determines whether the DRB and the PDU session corresponding to the DRB have been released, or determines whether the DRB and the EPS bearer corresponding to the DRB have been released. In the case of release, it releases the RRC connection and enters the disconnected state. Additionally, in the case of non-release, the terminal device determines whether it can forcibly release the DRB and the PDU session corresponding to the DRB, or whether it can forcibly release the DRB and the EPS bearer corresponding to the DRB. In the case of being able to forcibly release, it releases the DRB and the PDU session corresponding to the DRB, or releases the DRB and the EPS bearer corresponding to the DRB, and then releases the RRC connection and enters the disconnected state. Additionally, in the case of being unable to forcibly release, it fails to camp on the cell corresponding to the second radio access technology, or the terminal device does not switch to the disconnected state.

[0182] The following describes the implementation method for the terminal device in the connected state to camp on the cell supporting the second radio access technology through inter-system handover:

[0183] In some embodiments, the camping on the cell supporting the second radio access technology through inter-system handover includes: the terminal device may send an inter-system event report in the first radio access technology; the inter-system event report is used to indicate a handover from the currently camped cell to the cell supporting the second radio access technology; in the case of receiving the confirmation information corresponding to the inter-system event report, it performs an inter-system handover from the currently camped cell to the cell supporting the second radio access technology.

[0184] In some embodiments, before sending the inter-system event report in the first radio access technology, the method further includes: initiating an inter-system measurement for the first radio access technology.

[0185] In some embodiments, the receiving of the confirmation information corresponding to the inter-system event report includes: receiving the confirmation information corresponding to the inter-system event report within a first time period after sending the inter-system event report.

[0186] In an embodiment of the present application, when an inter-system event report is sent in the first radio access technology (RAT), in the case of receiving the acknowledgement information corresponding to the inter-system event report, the terminal device switches from the currently camped cell to the cell supporting the second RAT through the inter-system handover, so that the terminal device can camp on the cell of the second RAT through handover. During the process of handover between cells corresponding to different RATs, the interruption delay of the terminal device can reach 0, so that the terminal device can always be in the service state. Compared with the solution that the terminal device first enters the idle state and then camps on the cell corresponding to the second RAT through cell reselection, the terminal can always receive the downlink service, thus avoiding the situation that the terminal device cannot receive the downlink service before entering the idle state and camping on the cell corresponding to the second RAT.

[0187] The following describes the method for determining the second RAT:

[0188] In some embodiments, after the terminal device sends the first information in the first RAT, it further includes: determining the second RAT in the order of decreasing priority of the RATs in the second RAT set.

[0189] In some embodiments, the priority of the RATs in the second RAT set is determined according to at least one of the following: pre-configured information, and the signal strength corresponding to each RAT in the second RAT set.

[0190] In some embodiments, the priority of the RATs in the second RAT set can be determined by the terminal device according to the pre-configured information. For example, the pre-configured information may include the priority of the RATs in the RAT set supported by the maximum capability of the terminal device, and the priority order of the RATs in the second RAT set may be the same as the priority order of the RATs in the RAT set supported by the maximum capability. Among them, the pre-configured information may be the configuration information pre-defined before or after the terminal device leaves the factory, or the pre-configured information may be determined by triggering the terminal device through user operations, or the pre-defined information may be based on the configuration information pre-defined before or after the terminal device leaves the factory and the determination by triggering the terminal device through user operations.

[0191] In other embodiments, before the terminal device determines the priority of the RATs in the second RAT set, the terminal device may measure the signal strength corresponding to the RATs in the second RAT set, determine the priority of the RATs in the second RAT set according to the signal strength, or jointly determine the priority of the RATs in the second RAT set according to the signal strength and the pre-configured information.

[0192] In some embodiments, after sending the first information in the first RAT, it further includes: in the case of not camping on the cell supporting the second RAT, updating the second RAT to the RAT with the next lower priority in the second RAT set.

[0193] For example, the terminal device may first determine the second mode with the highest priority in the second mode set as the second mode, and the terminal device determines whether it has successfully camped on the cell of the second mode. If the camping is successful, the second information is sent in the second mode; if the camping fails, the terminal device determines the second mode with the second highest priority in the second mode set as the second mode, and re-determines whether it has successfully camped on the cell of the second mode, and so on, until the terminal device successfully camps on the second mode. In this way, the terminal device can camp on the cell of one of the second mode sets. In this embodiment, the terminal device will camp on the cell of one of the second mode sets in the order of the second mode set priority from high to low. It should be noted that when the terminal device fails to camp on the cell of each mode in the second mode set, the terminal device determines that the mode set change fails.

[0194] In this way, the terminal device determines the second mode with the highest priority in the second mode set as the second mode, and attempts to camp on the cell corresponding to the second mode. If it fails to camp on the cell corresponding to the second mode or the camping fails, the terminal device determines the second mode with the next highest priority in the second mode set as the second mode until it successfully camps on the cell corresponding to the second mode.

[0195] Figure 5 The flowchart of still another mode transmission method provided by the embodiment of the present application is shown as Figure 5 shown. This method is applied to a terminal device, and the method includes:

[0196] S501. Determine a first mode set, where the first mode set includes at least one first mode and at least one second mode, the first mode is the mode currently supported by the terminal device, and the second mode is the mode to be supported by the terminal device.

[0197] S502. Send first information in the first mode, where the first information is used to indicate the first mode set.

[0198] S503. Implicitly deregister and / or implicitly detach from the network of the third mode set; the modes in the third mode set are the modes currently supported and are not the modes to be supported.

[0199] When implicitly deregistering and / or implicitly detaching from the network of the third mode set, the terminal device does not need to interact with the network device, that is, it does not need to go through the deregistration process or the detachment process, and can deregister or detach from the network of the third mode set.

[0200] In some embodiments, implicit deregistration and / or implicit detachment of the network of the third centralized mode can be achieved in the following manner: the terminal device sets the network state of the third centralized mode to the deregistered state or the detached state. Among them, when the third centralized mode is the 4G mode, the mode is set to the detached state; when the third centralized mode is the 5G mode, the mode is set to the deregistered state.

[0201] In this way, when implicitly deregistering and / or implicitly detaching the network of the third centralized mode, the terminal device will no longer use the third centralized mode.

[0202] In some embodiments, when the mode to be supported includes the first mode, the terminal device will no longer execute the step of S504, and S503 can be executed before or after S502. Exemplarily, the modes currently supported by the terminal device (i.e., the modes before update) are A, B, and C, and the terminal device camps on mode A (corresponding to the first mode). If the terminal device needs to change the supported modes to modes A, D, and E (i.e., the modes after update or the modes to be supported), the terminal device can implicitly deregister modes B and C, and then the terminal device sends the first information in mode A. The first information is used to indicate that the first mode set is modes A, D, and E, without executing the step of S504.

[0203] In other embodiments, when the mode to be supported does not include the first mode, the terminal device can execute the step of S503 before or after S504. Additionally, when the terminal device camps on the second mode, the step of S503 is executed.

[0204] S504. Send the second information in the second mode; the second information is used to indicate the second mode set, and the second mode set is the mode set to be supported.

[0205] In this way, since the terminal device camps on the cell corresponding to the second mode, paging can be monitored through the cell corresponding to the second mode. At this time, there is no need to monitor paging through the currently supported mode anymore. Therefore, the terminal device can implicitly deregister / detach the currently supported mode and not for the mode to be supported, so as to enable the mode synchronized by the terminal device to the network device through the second information to be synchronized with the mode to be supported by the terminal device.

[0206] In some embodiments, the third mode set may include at least one mode. For example, if the currently supported modes are modes A, B, and C, and the modes to be supported are D, E, and F, the third mode set may be modes A, B, and C. Another example is that if the currently supported modes are modes A, B, and C, and the modes to be supported are A, D, and E, the third mode set may be modes B and C.

[0207] In some other embodiments, the third set of radio access technologies includes radio access technologies in the currently supported radio access technologies except for the radio access technologies to be supported. For example, if the currently supported radio access technologies include radio access technologies A, B, and C, and the radio access technologies to be supported include A, D, and E, the terminal device may implicitly deregister and / or implicitly detach from radio access technologies B and C.

[0208] In the embodiments of the present application, by implicitly deregistering and / or implicitly detaching from the network of the radio access technologies in the third set of radio access technologies, the terminal device does not need to interact with the network device, and the terminal device itself deregisters and / or detaches from the network of the radio access technologies in the third set of radio access technologies. Since deregistering and / or detaching by interacting with the network device may cause the terminal device to be in a service-free state for a long time after detaching / deregistering, and thus unable to process downlink services (such as incoming call services) for a long time. However, in the embodiments of the present application, since the terminal device implicitly deregisters and / or implicitly detaches from the network of the radio access technologies in the third set of radio access technologies, the terminal device can receive downlink services through the network of the currently camped radio access technology, and thus the impact on the downlink services of the terminal device can be reduced.

[0209] In some embodiments, the first information and / or the second information is included in a Tracking Area Update (TAU) request or a Mobility Restriction Update (MRU) request.

[0210] In some other embodiments, the first information and / or the second information is included in the capability information of the terminal device. The capability information of the terminal device is sent by the terminal device to the network device after the terminal device receives a capability query message sent by the network device.

[0211] It should be noted that in the embodiments of the present application, the currently supported radio access technologies, the radio access technologies to be supported, the first set of radio access technologies, the second set of radio access technologies, etc. are for a Subscriber Identity Module (SIM) card of the terminal device, that is, one SIM card corresponds to at least one radio access technology. Or rather, the embodiments of the present application can be applied to a terminal device with only one SIM card. In some other embodiments, the embodiments of the present application can be applied to a terminal device with multiple SIM cards. Each SIM card and the corresponding communication module in the multiple SIM cards can be applied to the radio access technology transmission method in the embodiments of the present application.

[0212] In the embodiments of the present application, when it is necessary to reconfigure a new set of radio access technologies for a multi-mode terminal, a method is proposed to avoid deregistration to complete this process and minimize or completely eliminate the impact on incoming call services as much as possible.

[0213] In some implementation scenarios, if the RAT configuration set RAT_CONFIG_1 includes radio access technologies A, B, and C, and the terminal has successfully camped and registered on radio access technology A. Suppose the newly configured RAT configuration set RAT_CONFIG_3 to be set this time includes radio access technologies A, D, and E. That is to say, if the new RAT configuration set includes the currently camped and registered radio access technology A, then only one MRU (Mobility Registration Update) / TAU (Tracking Area Update) process needs to be initiated on radio access technology A to synchronize its latest capabilities with the network through this process. In this way, the terminal device can avoid unnecessary registration, network search, and re-registration processes.

[0214] However, in this scenario, if the new RAT configuration set RAT_CONFIG_3 includes the currently camped radio access technology, the entire process cannot be simply completed through the MRU / TAU process if the new RAT configuration set does not include the currently camped radio access technology, or even if the new RAT configuration set and the old RAT configuration set have no intersection.

[0215] Therefore, if the newly configured RAT configuration set includes the currently camped radio access technology, there is an opportunity to directly complete the setting process of the new RAT configuration set through the TAU / MRU process. If there is no currently camped radio access technology, or if the newly configured RAT configuration set does not include the currently camped radio access technology, other methods need to be considered to change the RAT configuration set.

[0216] Figure 6 The flowchart of a method for changing the RAT configuration set provided by the embodiments of this application is shown as Figure 6 shown, and the method includes:

[0217] S601. The terminal device has completed registration on a certain radio access technology in a RAT configuration set.

[0218] For example, the terminal device can complete registration on a certain RAT. S601 may include that the terminal device has completed registration on a certain radio access technology among the currently supported radio access technologies.

[0219] S602. The terminal device needs to change the currently supported RAT configuration set.

[0220] In S602, the currently supported RAT configuration set that the terminal device needs to change is the to-be-supported RAT configuration set. In some embodiments, at time t1, the terminal device can obtain an instruction triggered by the user to change the RAT configuration set, so that the terminal device determines that it needs to change the current RAT configuration set.

[0221] S603. If the terminal device is currently camped on a certain radio access technology, but the RAT configuration set to be changed does not include the camped radio access technology, determine a second radio access technology according to the terminal implementation method, make the second radio access technology the to-be-supported radio access technology, and camp on the second radio access technology through processes such as handover / reselection / search.

[0222] In this way, the terminal device can report the set of supported modes that the terminal device is to support through the second mode.

[0223] S604. If it is determined that the terminal device is not currently camped on any mode, or the camped mode already belongs to the set of supported modes to be supported.

[0224] S605. The terminal device implicitly detaches from the modes that are no longer needed (i.e., modes that belong to the set of supported modes but do not belong to the set of supported modes), and refreshes the capabilities and context of each layer according to the set of supported modes again.

[0225] S606. The terminal device successfully changes the set of modes.

[0226] S607. The terminal device searches for a network and camps on it according to the second mode.

[0227] In some embodiments, in S604, if the current camped mode of the terminal device already belongs to the set of supported modes to be supported, then in S607, the second mode is still the current camped mode of the terminal device. In S604, if it is determined that the terminal device is not currently camped on any mode, then in S607, the second mode is the mode reselected by the terminal device.

[0228] Through S603 to S607, the terminal device is synchronized with the network state in real time, and the called service is basically not affected.

[0229] S608. The terminal device performs a registration and capability update process according to the second mode.

[0230] In the embodiments of the present application, the mode on which the terminal device finally camps can be included in the set of supported modes. For example, if the new set of modes (corresponding to the supported modes to be supported) includes modes A, D, and E, then the mode on which the terminal device finally camps is one of modes A, D, and E. If it is determined that the terminal device is not currently camped on any mode, or the camped mode already belongs to the set of modes that need to be changed, at time t2, the terminal device implicitly detaches from the modes that are no longer needed, and refreshes the capabilities and context of each layer according to the supported modes again. After refreshing the capabilities and context of each layer, the set of modes is successfully changed, and the current time is time t3. After the terminal device searches for a network and camps on it according to the second mode, it enters time t4. At time t4, the terminal device performs a capability update process according to the second mode, and then at time t5, the process ends.

[0231] In some embodiments, if the current camped mode of the terminal device already belongs to the supported mode, then the terminal device will report the supported modes to be supported through the current camped mode, that is, the terminal device performs a capability update process according to the current camped mode.

[0232] Figure 7The flowchart of a system transmission method provided by an embodiment of the present application is shown as follows. Figure 7 As shown, this method is applied to a terminal device, and the method includes:

[0233] S701. Store the current system as the "old system set", and store the system to be set as the "new system set".

[0234] Among them, the old system set can correspond to the currently supported system, and the new system set can correspond to the system to be supported.

[0235] S702. Determine whether there is no residence in any system currently.

[0236] If S702 is yes, that is, there is no residence in any system currently, jump to S707. If S702 is no, that is, there is a currently resident system (such as the first system in the above embodiment), jump to S703.

[0237] S703. Whether the new system set includes the currently resident system.

[0238] For example, if the old system set includes systems A, B, and C, and the new system set includes systems D, E, and F, then the new system set does not include the currently resident system.

[0239] Another example, if the old system set includes systems A, B, and C, the currently resident system of the terminal device is system A, and the new system set includes systems A, D, and E, then the new system set includes the currently resident system.

[0240] Another example, if the old system set includes systems A, B, and C, the currently resident system of the terminal device is system A, and the new system set includes systems B, D, and E, then the new system set does not include the currently resident system.

[0241] If S703 is yes, jump to S722. If S703 is no, jump to S704.

[0242] S704. Take the union of the current system and the new system set as the "temporary system set", and take the new system set as the target system set of the different system.

[0243] Among them, the current system can refer to the currently resident system.

[0244] For example, if the old system set includes systems A, B, and C, the currently resident system of the terminal device is system A, and the new system set includes systems D, E, and F, then the temporary system set can include systems A, D, E, and F.

[0245] S705. Arrange the target system set of the different system in order of priority, and traverse it one by one from high to low to determine the target system of the different system (i.e., the second system corresponding to the above).

[0246] In some embodiments, the priority of the target system set of the different system can be pre-configured by the terminal device, or configured by the network device to the terminal device, or determined according to the signal quality corresponding to each system detected by the terminal device. In some embodiments, the priority of the target system set of the different system can be stored locally.

[0247] In some embodiments, the target system of the different system can be the system with the highest priority in the target system set of the different system. In some embodiments, in the case where the cell corresponding to the system with the highest priority where the terminal device camps fails, the target system of the different system can be the system with the second highest priority in the target system set of the different system. In some embodiments, in the case where the cell corresponding to the system with the second highest priority where the terminal device camps fails, the target system of the different system can be the system with the third highest priority in the target system set of the different system, and so on, until the terminal device can camp on one of the systems in the target system set of the different system. In the embodiments of the present application, the terminal device will preferentially camp on the cell corresponding to the system with a higher priority.

[0248] S706. The terminal device updates the local capabilities and context of each layer according to the "temporary system set" and initiates the TAU / MRU process to synchronize with the network.

[0249] For example, in the case where the terminal device determines that the temporary system set includes systems A, D, E, and F, the terminal device updates the local capabilities and context of each layer as follows: set the local capabilities and context of each layer to the local capabilities and context of each layer corresponding to systems A, D, E, and F. Among them, the context can be understood in the same way as the above context information.

[0250] For example, the old system set includes systems A, B, and C, the system where the terminal device currently camps is system A, the new system set includes systems D, E, and F, and the terminal device can delete the local capabilities and context of each layer corresponding to systems B and C and add the local capabilities and context of each layer corresponding to systems D, E, and F.

[0251] For example, the terminal device can synchronize the following content with the network device through the TAU / MRU process: the systems supported by the terminal device are A, D, E, and F.

[0252] S707. Whether the current RRC state is in the idle state.

[0253] When S707 is yes, that is, when the current RRC state is in the idle state, jump to S708; when S707 is no, that is, when the current RRC state is in a non-idle state, jump to S709.

[0254] S708: Initiate cell reselection or network search process and camp on a cell of the target radio access technology.

[0255] Among them, the cell of the target radio access technology can be a cell of a different radio access technology of the target system.

[0256] S709: Check whether the current network supports NCR.

[0257] When S709 is yes, that is, when the current network supports NCR, jump to S710; when S709 is no, that is, when the current network does not support NCR, jump to S711.

[0258] S710: The terminal device returns to the idle state by carrying the cause "NAS signalling connection release (NCR)" in the TAU / MRU request (corresponding to the above target request).

[0259] S711: The terminal device determines whether all DRBs and their corresponding PDU sessions / EPS bearers have been released.

[0260] When S711 is yes, jump to S712; when S711 is no, jump to S713.

[0261] S712: The terminal device locally releases the RRC connection and returns to the idle state.

[0262] S713: The terminal device initiates inter-radio access technology measurements for the target radio access technology, forcibly reports the corresponding event, and starts the timer T_handover.

[0263] Among them, the target radio access technology can correspond to the second radio access technology mentioned above.

[0264] During the implementation process, the terminal device can select the preferred radio access technology from the "temporary radio access technology set" as the target radio access technology, forcibly initiate inter-radio access technology measurements for this radio access technology and report the corresponding event, and start the timer T_handover at the same time.

[0265] S714: The terminal device waits for the network response and completes the inter-radio access technology handover.

[0266] During the implementation process, if the network does not respond, continue to wait for the timer T_handover.

[0267] S715. Whether the network responds and completes the inter-system handover during the operation of timer T_handover.

[0268] If S715 is yes, jump to S716; if S715 is no, jump to S714.

[0269] S716. Stop timer T_handover.

[0270] S717. Timer T_handover times out.

[0271] S718. The terminal device determines whether to allow forced release of all current DRBs and their corresponding PDU sessions / EPS bearers.

[0272] If S718 is yes, the terminal device releases all current DRBs and their corresponding PDU sessions / EPS bearers, jumps to S712, and then jumps to S708. If S718 is no, jump to S719.

[0273] S719. The user-initiated radio access technology set change fails.

[0274] After S719, jump to S720.

[0275] After S708, jump to S720.

[0276] S720. The terminal device determines whether the target radio access technology has successfully camped.

[0277] If S720 is yes, jump to S722; if S720 is no, jump to S721.

[0278] S721. The terminal device determines whether it has traversed all radio access technologies in the new radio access technology set.

[0279] If S721 is yes, it is determined that the terminal device has not camped on any radio access technology. After that, the terminal device can execute S722 after camping on the target radio access technology. If S721 is no, the terminal device jumps to S705, and the terminal device will re-select the inter-system target radio access technology according to the radio access technology priority.

[0280] S722. The terminal device implicitly deregisters / implicitly detaches from the radio access technologies "included in the old radio access technology set but not included in the new radio access technology set", deletes the "temporary radio access technology set", directly activates the new radio access technology set, and updates the local capabilities and context of each layer according to the activated radio access technology set.

[0281] S723. Whether the terminal device has successfully camped.

[0282] If S723 is No, the process ends. After that, the terminal device can execute S724 after camping on the target radio access technology. If S723 is Yes, jump to S724.

[0283] S724. The terminal device determines whether the current camp and the previous camp belong to different systems.

[0284] Different systems can be represented as cells corresponding to different radio access technologies.

[0285] If S724 is Yes, jump to S725; if S724 is No, jump to S726.

[0286] S725. The terminal device initiates a TAU / MRU process for a different radio access technology.

[0287] In S725, the terminal device reports the new radio access technology set through the cell of the current camped radio access technology.

[0288] For example, if the old radio access technology set is radio access technology A, B, and C, and the new radio access technology set is radio access technology D, E, and F, the terminal device camped on a cell corresponding to radio access technology A last time and camps on a cell corresponding to radio access technology D this time. The terminal device reports the new radio access technology set (e.g., radio access technology D, E, and F) through the cell corresponding to radio access technology D.

[0289] S726. The terminal device initiates a TAU / MRU process to synchronize the latest capabilities with the network.

[0290] In S726, if the cell corresponding to the radio access technology of the current camp of the terminal device is the same as the cell corresponding to the radio access technology of the previous camp, the terminal device can report the new radio access technology set through the cell corresponding to this radio access technology.

[0291] For example, if the old radio access technology set is radio access technology A, B, and C, and the new radio access technology set is radio access technology A, D, and E, the terminal device camped on a cell corresponding to radio access technology A last time and also camps on a cell corresponding to radio access technology A this time. The terminal device reports the new radio access technology set (e.g., radio access technology A, D, and E) through the cell corresponding to radio access technology A.

[0292] In some embodiments, if a Secondary Cell Group (SCG) has been successfully added under EUTRA NR Dual-Connectivity (ENDC), the SCG needs to be disconnected. Thus, if the network camped on previously was under ENDC, the master node and the secondary node need to be disconnected and re-camped on the network corresponding to the target radio access technology.

[0293] In the embodiments of the present application, the TAU / MRU trigger reasons and procedures follow the 3GPP specifications.

[0294] In the embodiments of the present application, the target radio access technology (RAT) is still determined according to the preset RAT priority.

[0295] In the embodiments of the present application, the temporary RAT set represents the set of RATs that the UE temporarily uses during the setup process and can be used for behaviors such as synchronizing with the network to update capabilities.

[0296] In the embodiments of the present application, the inter-system target RAT set (which can correspond to the above-mentioned new RAT set) represents the inter-system target RAT set set when initiating inter-system reselection / redirection / handoff / search.

[0297] In the embodiments of the present application, whether the network supports NCR refers to whether the "NAS signalling connection release" flag is received during the registration process of a terminal with the ability to support multiple SIMs (MUSIM capability).

[0298] In the embodiments of the present application, the timer T_handover is used to monitor the time from when an inter-system measurement report is sent after the RRC connection state in this scenario until the network issues a handover or redirection command.

[0299] In the embodiments of the present application, whether to allow forced release of the DRB can be customized by the terminal device according to product or user requirements.

[0300] In the embodiments of the present application, the terminal device is first transferred to a certain RAT in the target RAT set and then the MRU / TAU process is executed, avoiding the deregistration process. For the network, the terminal device is almost always online, thus greatly reducing the impact on the network's incoming call service.

[0301] In the embodiments of the present application, the time of the RAT set change process is shortened: during the whole process, especially in the idle state, since there is no need to deregister, there is no need to re-establish an RRC connection to interact with the network. From experience, the deregistration process takes at least hundreds of milliseconds and at most 5 seconds. Using this method can subtract the time overhead of this process.

[0302] In the embodiments of the present application, except for possible missed incoming call services during inter-system reselection or network search, the terminal is online throughout other steps. In the connected state, there is no need to release the connection, and there is an opportunity to directly perform the MRU / TAU process to complete the RAT change process as soon as possible at the target RAT, and the terminal device is almost always online.

[0303] In the embodiments of the present application, when a terminal device with multi-mode capabilities executes a network mode change process, it can utilize the existing process to first camp on a cell in the target network mode set, and then synchronize its capabilities with the network through the MRU / TAU process. This process is faster than the traditional deregistration method; at the same time, throughout the process, it can ensure that the terminal device is basically online all the time, without affecting the incoming call service of the network.

[0304] The typical mobility update methods MRU / TAU mentioned in the embodiments of the present application correspond to the processes in the New Radio (NR) / Long Term Evolution (LTE) network mode, and can also be extended to other network modes including but not limited to those in 3GPP, such as the Route Area Update (RAU) / Location Update (LU) processes in GSM / Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) / Wideband Code Division Multiple Access (W-CDMA) and other network modes. At the same time, it can also be extended to the location update and other processes in the network modes of 3GPP2.

[0305] Based on the foregoing embodiments, the embodiments of the present application provide a wireless communication device, which includes each unit included and each module included in each unit, and can be implemented by a processor in the terminal device; of course, it can also be implemented by specific logic circuits.

[0306] Figure 8 FIG. is a schematic structural diagram of a wireless communication device provided in the embodiments of the present application. As Figure 8 shown, the wireless communication device 800 includes:

[0307] A determination unit 801, configured to determine a first network mode set, where the first network mode set includes at least one first network mode and at least one second network mode, the first network mode is the network mode currently supported by the terminal device, and the second network mode is the network mode to be supported by the terminal device;

[0308] A communication unit 802, configured to: send first information in the first network mode, where the first information is used to indicate the first network mode set.

[0309] In some embodiments, the wireless communication device further includes: an update unit, configured to:

[0310] update the configuration information of the network mode of the terminal device to the configuration information of the network mode in the first network mode set; and / or,

[0311] Update the context information of the mode of the terminal device to the context information of the mode in the first mode set.

[0312] In some embodiments, the communication unit 802 is further configured to: send a second piece of information in the second mode; the second piece of information is used to indicate a second mode set, and the second mode set is the mode set to be supported.

[0313] In some embodiments, the updating unit is further configured to:

[0314] Update the configuration information of the mode of the terminal device to the configuration information of the mode in the second mode set; and / or,

[0315] Update the context information of the mode of the terminal device to the context information of the mode in the second mode set.

[0316] In some embodiments, the communication unit 802 is further configured to: when the terminal device is in a non-connected state, camp on a cell that supports the second mode.

[0317] In some embodiments, the communication unit 802 is further configured to: when the terminal device is in a connected state, switch to the non-connected state and camp on a cell that supports the second mode through cell reselection.

[0318] In some embodiments, the communication unit 802 is further configured to: when the current camped cell supports NCR, send a target request in the first mode, where the target request is used to instruct the current camped cell to release the RRC connection with the terminal device; when receiving the confirmation response corresponding to the target request, switch to the non-connected state.

[0319] In some embodiments, the target request is a TAU request or an MRU request, and the target request includes information indicating the reason for the NCR.

[0320] In some embodiments, the communication unit 802 is further configured to: when at least one of the following conditions is met and the current camped cell supports the NCR, send the target request in the first mode:

[0321] When the data radio bearer DRB and the protocol data unit PDU session / evolved packet system EPS bearer corresponding to the DRB are not released;

[0322] Send an inter-system event report through the first mode and not camp on the second mode.

[0323] In some embodiments, the determining unit 801 is further configured to:

[0324] Determine that the data radio bearer DRB and the protocol data unit PDU session corresponding to the DRB have been released, or the DRB and the evolved packet system EPS bearer corresponding to the DRB have been released.

[0325] In some embodiments, the determining unit 801 is further configured to:

[0326] When the current resident cell does not support NCR, and / or when sending an inter-system event report through the first radio access technology fails to camp on the second radio access technology, determine that the DRB and the PDU session corresponding to the DRB have been released, or the DRB and the EPS bearer corresponding to the DRB have been released.

[0327] In some embodiments, the determining unit 801 is further configured to:

[0328] Send an inter-system event report in the first radio access technology; the inter-system event report is used to indicate a handover from the currently resident cell to the cell supporting the second radio access technology;

[0329] When the acknowledgment information corresponding to the inter-system event report is not received, switch to the disconnected state; the acknowledgment information is used to indicate a handover from the currently resident cell to the cell supporting the second radio access technology.

[0330] In some embodiments, the determining unit 801 is further configured to:

[0331] When the current resident cell does not support NCR, and / or when the data radio bearer DRB and the PDU session / EPS bearer corresponding to the DRB have not been released, send an inter-system event report in the first radio access technology.

[0332] In some embodiments, the determining unit 801 is further configured to:

[0333] Within a first time period after sending the inter-system event report, the acknowledgment information corresponding to the inter-system event report is not received.

[0334] In some embodiments, the determining unit 801 is further configured to:

[0335] When the DRB and the PDU session / EPS bearer corresponding to the DRB have been released, release the RRC connection and enter the disconnected state.

[0336] In some embodiments, the determining unit 801 is further configured to:

[0337] When the terminal device is in the connected state, perform an inter-system handover to camp on a cell supporting the second radio access technology.

[0338] In some embodiments, the determining unit 801 is further configured to:

[0339] Send an inter-system event report in the first radio access technology (RAT); the inter-system event report is used to indicate a handover from the currently camped cell to the cell supporting the second RAT.

[0340] In the case of receiving the confirmation information corresponding to the inter-system event report, perform an inter-system handover from the currently camped cell to the cell supporting the second RAT.

[0341] In some embodiments, the determining unit 801 is further configured to:

[0342] Receive the confirmation information corresponding to the inter-system event report within a first time period after sending the inter-system event report.

[0343] In some embodiments, the communication unit 802 is further configured to: initiate an inter-system measurement for the first RAT.

[0344] In some embodiments, the determining unit 801 is further configured to:

[0345] Determine the second RAT in the order of decreasing priority of the second RAT concentration.

[0346] In some embodiments, the determining unit 801 is further configured to:

[0347] In the case of not camping on a cell supporting the second RAT, update the second RAT to the RAT with the next lower priority in the second RAT concentration.

[0348] In some embodiments, the priority of the second RAT concentration is determined according to at least one of the following: pre-configured information, the signal strength corresponding to each RAT in the second RAT concentration.

[0349] In some embodiments, the first information and / or the second information is included in the Tracking Area Update (TAU) request or the Mobility Reporting Unit (MRU) request; or,

[0350] The first information and / or the second information is included in the capability information of the terminal device, and the capability information of the terminal device is sent by the terminal device to the network device after receiving a capability query message sent by the network device.

[0351] In some embodiments, the wireless communication device 800 further includes: a setting unit, configured to implicitly deregister and / or implicitly detach from the network of the third RAT concentration; the RATs in the third RAT concentration are the currently supported RATs and are not the to-be-supported RATs.

[0352] The description of the above device embodiments is similar to that of the above method embodiments and has similar beneficial effects to those of the method embodiments. For the technical details not disclosed in the device embodiments of the present application, please refer to the description of the method embodiments of the present application for understanding.

[0353] It should be noted that in the embodiments of the present application, if the above-mentioned format transmission method is implemented in the form of software function modules and sold or used as an independent product, it can also be stored in a computer storage medium. Based on such an understanding, the technical solution of the embodiments of the present application, in essence, or the part that contributes to the related technology, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a terminal device to execute all or part of the methods described in the various embodiments of the present application.

[0354] Figure 9 It is a schematic structural diagram of a terminal device provided by an embodiment of the present application. Figure 9 As shown in the figure, the terminal device 900 may include a processor 910 and a memory 920. The memory 920 stores a computer program that can run on the processor 910. When the processor 910 executes the program, it implements the format transmission method in any of the above embodiments.

[0355] Optionally, the memory 920 may be a separate device independent of the processor 910 or integrated in the processor 910.

[0356] In some embodiments, as Figure 9 shown, the terminal device 900 may further include a transceiver 930. The processor 910 may control the transceiver 930 to communicate with other devices. Specifically, it may send information or data to other devices or receive information or data sent by other devices.

[0357] Among them, the transceiver 930 may include a transmitter and a receiver. The transceiver 930 may further include antennas, and the number of antennas may be one or more.

[0358] Figure 10 It is a schematic structural diagram of a chip provided by an embodiment of the present application. Figure 10 As shown in the figure, the chip 1000 includes a processor 1010. The processor 1010 is used to call and run a computer program from a memory to execute the method in any embodiment of the present application.

[0359] In some embodiments, as Figure 10 shown, the chip 1000 may further include a memory 1020. Among them, the processor 1010 may call and run a computer program from the memory 1020 to implement the method in the embodiments of the present application.

[0360] Among them, the memory 1020 can be a separate device independent of the processor 1010, or can be integrated in the processor 1010.

[0361] In some embodiments, the chip 1000 may further include an input interface 1030. Among them, the processor 1010 can control the input interface 1030 to communicate with other devices or chips. Specifically, it can obtain information or data sent by other devices or chips.

[0362] In some embodiments, the chip 1000 may further include an output interface 1040. Among them, the processor 1010 can control the output interface 1040 to communicate with other devices or chips. Specifically, it can output information or data to other devices or chips.

[0363] In some embodiments, the chip can be applied to the terminal device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the mobile terminal / terminal device in each method of the embodiments of the present application. For the sake of brevity, it will not be elaborated here.

[0364] It should be understood that the chip mentioned in the embodiments of the present application can also be referred to as a system-on-chip, system chip, chip system, or system-on-chip, etc.

[0365] The embodiments of the present application provide a computer storage medium. The computer storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the steps of the format transmission method in any of the above embodiments.

[0366] It should be pointed out here that: the descriptions of the above chip, computer storage medium, and device embodiments are similar to the descriptions of the above method embodiments and have similar beneficial effects to the method embodiments. For the technical details not disclosed in the chip, computer storage medium, and device embodiments of the present application, please refer to the descriptions of the method embodiments of the present application for understanding.

[0367] The above wireless communication device, chip or processor may include the integration of any one or more of the following: Application Specific Integrated Circuit (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA), Central Processing Unit (CPU), Graphics Processing Unit (GPU), neural-network processing units (NPU), controller, microcontroller, microprocessor, programmable logic device, discrete gate or transistor logic device, discrete hardware component. It can be understood that the electronic device realizing the above processor function may also be other, and the embodiments of the present application do not make specific limitations.

[0368] The above computer storage medium / memory may include one or more of the following integrations: Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Ferromagnetic Random Access Memory (FRAM), Flash Memory, magnetic surface memory, optical disc, Compact Disc Read-Only Memory (CD-ROM), etc.; it may also be various terminals including one or any combination of the above memories, such as mobile phones, computers, tablet devices, personal digital assistants, etc.

[0369] It should be understood that the "one embodiment" or "an embodiment" or "an embodiment of the present application" or "the foregoing embodiment" or "some embodiments" or "some embodiments" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, the "in one embodiment" or "in an embodiment" or "an embodiment of the present application" or "the foregoing embodiment" or "some embodiments" or "some embodiments" that appear throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics may be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present application, the magnitudes of the serial numbers of the above processes do not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. The serial numbers of the embodiments of the present application above are only for description and do not represent the advantages or disadvantages of the embodiments.

[0370] Without special instructions, when the terminal device executes any step in the embodiments of the present application, it may be the processor of the terminal device that executes this step. Unless otherwise specified, the embodiments of the present application do not limit the order of execution of the following steps by the terminal device. In addition, the methods used to process data in different embodiments may be the same method or different methods. It should also be noted that any step in the embodiments of the present application can be independently executed by the terminal device, that is, when the terminal device executes any step in the above embodiments, it may not depend on the execution of other steps.

[0371] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0372] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined, or can be integrated into another system, or some features can be ignored, or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed with each other can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0373] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units; they may be located in one place or distributed across multiple network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0374] In addition, each functional unit in the embodiments of the present application may all be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware, or in the form of a combination of hardware and software functional units.

[0375] The methods disclosed in several method embodiments provided by the present application can be arbitrarily combined without conflict to obtain new method embodiments.

[0376] The features disclosed in several product embodiments provided by the present application can be arbitrarily combined without conflict to obtain new product embodiments.

[0377] The features disclosed in several method or device embodiments provided by the present application can be arbitrarily combined without conflict to obtain new method embodiments or device embodiments.

[0378] Those of ordinary skill in the art can understand that all or part of the steps to implement the above method embodiments can be completed by hardware related to program instructions. The foregoing program can be stored in a computer storage medium. When the program is executed, it performs the steps including the above method embodiments; and the foregoing storage medium includes: removable storage devices, read-only memory (ROM), magnetic disks, or optical disks and other various media that can store program codes.

[0379] Alternatively, if the above-mentioned integrated units of the present application are implemented in the form of software functional modules and sold or used as independent products, they can also be stored in a computer storage medium. Based on such an understanding, the technical solution of the embodiments of the present application essentially or the part that makes contributions to the related technologies can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in various embodiments of the present application. And the foregoing storage medium includes: removable storage devices, ROM, magnetic disks, or optical disks and other various media that can store program codes.

[0380] In the embodiments of the present application, the descriptions of the same steps and the same content in different embodiments can be referred to each other. In the embodiments of the present application, the term "and" does not affect the order of steps. For example, when a terminal device executes A and then executes B, it can be that the terminal device first executes A and then executes B, or the terminal device first executes B and then executes A, or the terminal device executes A and B simultaneously.

[0381] In the embodiments of the present application and the appended claims, the singular forms "a", "the", and "said" are also intended to include the plural forms unless the context clearly dictates otherwise.

[0382] It should be understood that the term "and / or" used herein is merely a description of the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or B exists alone. In addition, the character " / " herein generally indicates that the associated objects before and after are in an "or" relationship.

[0383] It should be noted that in each of the embodiments involved in the present application, all steps or some steps can be executed as long as a complete technical solution can be formed.

[0384] As described above, the above are only the embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A standard transmission method, characterized in that, Applied to a terminal device, including: Determine a first set of radio access technologies (RATs), where the first set of RATs includes at least one first RAT and at least one second RAT. The first RAT is the RAT currently supported by the terminal device, and the second RAT is the RAT to be supported by the terminal device. The RAT currently supported by the terminal device is the RAT that the terminal device has indicated to the network device, and the RAT to be supported by the terminal device is the RAT that the terminal device has not indicated to the network device. At least one of the first RATs has no intersection with at least one of the second RATs. Send first information in the first RAT, where the first information is used to indicate the first set of RATs. Implicitly deregister and / or implicitly detach from the network of the RATs in the third set of RATs. The RATs in the third set of RATs are the RATs currently supported and not the RATs to be supported. Wherein, implicitly deregistering and / or implicitly detaching from the network of the RATs in the third set of RATs includes: the terminal device sets the network state of the RATs in the third set of RATs to the deregistered state or the detached state. After sending the first information in the first RAT, further includes: If the set of RATs to be supported does not include the currently camped RAT, or the set of RATs to be supported does not include the first RAT, when the terminal device is in the connected state, switch to the non-connected state and camp on a cell that supports the second RAT through cell reselection. Send second information in the second RAT. The second information is used to indicate the second set of RATs, and the second set of RATs is the set of RATs to be supported.

2. The method according to claim 1, wherein Before sending the first information in the first RAT, further includes: Update the configuration information of the RAT of the terminal device to the configuration information of the RATs in the first set of RATs; and / or, Update the context information of the RAT of the terminal device to the context information of the RATs in the first set of RATs.

3. The method according to claim 1, characterized in that, Before sending the second information in the second RAT, further includes: Update the configuration information of the RAT of the terminal device to the configuration information of the RATs in the second set of RATs; and / or, Update the context information of the RAT of the terminal device to the context information of the RATs in the second set of RATs.

4. The method according to claim 1, wherein Before sending the second information in the second RAT, further includes: When the terminal device is in the non-connected state, camp on a cell that supports the second RAT.

5. The method according to claim 4, characterized in that, When the terminal device is in the connected state, switching to the non-connected state includes: When the currently camped cell supports Network Controlled Reconfiguration (NCR), send a target request in the first RAT, where the target request is used to indicate that the currently camped cell releases the Radio Resource Control (RRC) connection with the terminal device. When receiving the confirmation response corresponding to the target request, switch to the non-connected state.

6. The method according to claim 5, characterized in that, The target request is a Tracking Area Update (TAU) request or a Mobility Request Update (MRU) request, and the target request includes information indicating the reason for the NCR.

7. The method according to claim 5, characterized in that, When the currently camped cell supports NCR, sending the target request in the first RAT includes: Sending the target request in the first RAT when at least one of the following conditions is met and the currently camped cell supports the NCR: When the data radio bearer (DRB) and the protocol data unit (PDU) session / Evolved Packet System (EPS) bearer corresponding to the DRB are not released; Sending an inter-system event report through the first radio access technology (RAT) without camping on the second RAT.

8. The method according to claim 1, wherein Before switching to the disconnected state, it further includes: Determining that the data radio bearer (DRB) and the protocol data unit (PDU) session corresponding to the DRB have been released, or the DRB and the EPS bearer corresponding to the DRB have been released.

9. The method according to claim 8, wherein The determining that the data radio bearer (DRB) and the protocol data unit (PDU) session corresponding to the DRB have been released, or the DRB and the EPS bearer corresponding to the DRB have been released, includes: When the current camping cell does not support NCR, and / or when sending an inter-system event report through the first RAT without camping on the second RAT, determining that the DRB and the PDU session corresponding to the DRB have been released, or the DRB and the EPS bearer corresponding to the DRB have been released.

10. The method according to claim 1, wherein The switching to the disconnected state includes: Sending an inter-system event report in the first RAT; the inter-system event report is used to indicate a handover from the currently camped cell to the cell supporting the second RAT; Switching to the disconnected state when the acknowledgment information corresponding to the inter-system event report is not received; the acknowledgment information is used to indicate a handover from the currently camped cell to the cell supporting the second RAT.

11. The method according to claim 10, wherein The sending an inter-system event report in the first RAT includes: When the current camping cell does not support NCR, and / or when the data radio bearer (DRB) and the PDU session / EPS bearer corresponding to the DRB are not released, sending an inter-system event report in the first RAT.

12. The method according to claim 10, wherein The not receiving the acknowledgment information corresponding to the inter-system event report includes: Not receiving the acknowledgment information corresponding to the inter-system event report within a first time period after sending the inter-system event report.

13. The method according to claim 10, characterized in that The switching to the disconnected state includes: When the DRB and the PDU session / EPS bearer corresponding to the DRB have been released, releasing the RRC connection and entering the disconnected state.

14. The method according to claim 1, characterized in that Before sending the second information in the second RAT, it further includes: When the terminal device is in the connected state, camping on a cell supporting the second RAT through inter-system handover.

15. The method according to claim 14, wherein The camping on a cell supporting the second RAT through inter-system handover includes: Sending an inter-system event report in the first RAT; the inter-system event report is used to indicate a handover from the currently camped cell to the cell supporting the second RAT; When the acknowledgment information corresponding to the inter-system event report is received, performing an inter-system handover from the currently camped cell to the cell supporting the second RAT.

16. The method according to claim 15, characterized in that, The receiving the acknowledgment information corresponding to the inter-system event report includes: Receiving the acknowledgment information corresponding to the inter-system event report within a first time period after sending the inter-system event report.

17. The method according to claim 10 or 15, characterized in that Before sending an inter-system event report in the first RAT, the method further includes: Initiate inter-system measurement for the first radio access technology (RAT).

18. The method according to any one of claims 1, 3 to 16, characterized in that, After sending the first information in the first RAT, it further includes: Determine the second RAT according to the order of the priorities of the second RAT concentration from high to low.

19. The method according to claim 18, wherein After sending the first information in the first RAT, it further includes: If not camped on a cell supporting the second RAT, update the second RAT to the RAT with the next lower priority in the second RAT concentration.

20. The method according to claim 18, characterized in that, The priority of the second RAT concentration is determined according to at least one of the following: pre-configured information, the signal strength corresponding to each RAT in the second RAT concentration.

21. The method according to any one of claims 1, 3 to 16, 19 and 20, characterized in that, The first information and / or the second information are included in the Tracking Area Update (TAU) request or the Mobility Reporting Unit (MRU) request; or The first information and / or the second information are included in the capability information of the terminal device, and the capability information of the terminal device is sent by the terminal device to the network device after receiving a capability query message sent by the network device.

22. A wireless communication device, characterized in that, It includes: A determination unit, configured to: determine a first RAT set, the first RAT set includes at least one first RAT and at least one second RAT, the first RAT is the RAT currently supported by the terminal device, and the second RAT is the RAT to be supported by the terminal device; The RAT currently supported by the terminal device is the RAT that the terminal device has indicated to the network device, and the RAT to be supported by the terminal device is the RAT that the terminal device has not indicated to the network device; at least one of the first RATs has no intersection with at least one of the second RATs; A communication unit, configured to: send first information in the first RAT, and the first information is used to indicate the first RAT set; A setting unit, configured to: implicitly deregister and / or implicitly detach from the network of the RAT in the third RAT concentration; the RATs in the third RAT concentration are the currently supported RATs and are not the RATs to be supported; The setting unit is further configured to: the terminal device sets the network status of the RAT in the third RAT concentration to the deregistered state or the detached state; The communication unit is configured to: if the set of RATs to be supported does not include the currently camped RAT, or the set of RATs to be supported does not include the first RAT, when the terminal device is in the connected state, switch to the non-connected state and camp on a cell supporting the second RAT through cell reselection; send second information in the second RAT; the second information is used to indicate a second RAT set, and the second RAT set is the set of RATs to be supported.

23. A terminal device, characterized in that, It includes: A processor and a memory, The memory stores a computer program that can run on the processor; When the processor executes the program, it implements the method according to any one of claims 1 to 21.

24. A chip, characterized in that, It includes: a processor, configured to call and run a computer program from the memory to execute the method according to any one of claims 1 to 21.

25. A computer storage medium, characterized in that, The computer storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the method according to any one of claims 1 to 21.

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