Registration method and apparatus, network side device, and terminal device

Abstract

The present application relates to the technical field of communications, and discloses a registration method and apparatus, a network side device, and a terminal device. The registration method in embodiments of the present application comprises: when a first condition is satisfied, a terminal device establishes dual steering, wherein the first condition comprises at least one of the following: the terminal device receives a first message sent by a first core network device, the first message carrying a first instruction, and the first instruction being used for instructing the terminal device to access a second core network device or being used for instructing the terminal device to establish dual steering; and a terminal-originated call service in the terminal device satisfies a trigger condition for dual steering.

Description

Registration method and device, network side equipment and terminal equipment

[0001] Cross-reference to Related Applications

[0002] The present application claims priority to the Chinese patent application No. 202411094454.X, filed on August 9, 2024, and entitled "Registration method and device, network side equipment and terminal equipment", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application belongs to the field of communication technology, and specifically relates to a registration method, device, network side equipment and terminal equipment. BACKGROUND

[0004] The current dual steering is usually that a terminal device (UE) is registered and camped on two Radio Access Technology (RAT) cells, so as to minimize the coupling of two Radio Access Networks (RANs), which are independent for the terminal and the RAN. However, in this case, both receivers of the UE need to be kept in a listening state, which is power-consuming. SUMMARY

[0005] Embodiments of the present application provide a registration method, device, network side equipment and terminal equipment, which can solve the problem of high power consumption of the terminal device in the current dual steering scheme.

[0006] In a first aspect, a registration method is provided, comprising:

[0007] The terminal device establishes dual steering when a first condition is met.

[0008] The first condition comprises at least one of the following:

[0009] The terminal device receives a first message sent by the first core network device, and the first message carries a first indication; the first indication is used to instruct the terminal device to access a second core network device or to establish dual steering.

[0010] The terminal device receives a first message sent by the first core network device, and the first message carries a first indication; the first indication is used to instruct the terminal device to access a second core network device or to establish dual steering.

[0011] In a second aspect, another registration method is provided, comprising:

[0012] The first core network device sends a first message to the terminal device.

[0013] The first message carries a first indication. The first indication is used to indicate that the terminal device accesses a second core network device or is used to indicate that the terminal device establishes dual-flow transmission.

[0014] In a third aspect, a registration apparatus is provided, which is applied to a terminal device and includes:

[0015] The transmission establishment module is configured to establish dual-flow transmission when a first condition is met.

[0016] The first condition includes at least one of the following:

[0017] The terminal device receives a first message sent by the first core network device. The first message carries a first indication. The first indication is used to indicate that the terminal device accesses a second core network device or is used to indicate that the terminal device establishes dual-flow transmission.

[0018] The terminal device initiates a call service, and a trigger condition of dual-flow transmission is met.

[0019] In a fourth aspect, a registration apparatus is provided, which is applied to a first core network device and includes:

[0020] The first message sending module is configured to send a first message to a terminal device.

[0021] The first message carries a first indication. The first indication is used to indicate that the terminal device accesses a second core network device or is used to indicate that the terminal device establishes dual-flow transmission.

[0022] In a fifth aspect, a terminal device is provided. The terminal device includes a processor and a memory. The memory stores programs or instructions that can be run on the processor. When the programs or instructions are executed by the processor, the steps of the registration method according to the first aspect are implemented.

[0023] In a sixth aspect, a network-side device is provided. The network-side device includes a processor and a memory. The memory stores programs or instructions that can be run on the processor. When the programs or instructions are executed by the processor, the steps of the registration method according to the second aspect are implemented.

[0024] In a seventh aspect, a registration system is provided. The registration system includes a terminal device and a network-side device. The terminal device is configured to execute the steps of the registration method according to the first aspect. The network-side device is configured to execute the steps of the registration method according to the second aspect.

[0025] In an eighth aspect, a readable storage medium is provided, and the readable storage medium stores a program or instructions, which, when executed by a processor, implement the steps of the registration method according to the first aspect or the steps of the registration method according to the second aspect.

[0026] In a ninth aspect, a chip is provided, and the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to execute a program or instructions to implement the registration method according to the first aspect or the registration method according to the second aspect.

[0027] In a tenth aspect, a computer program / program product is provided, and the computer program / program product is stored in a storage medium, and the computer program / program product is executed by at least one processor to implement the steps of the registration method according to the first aspect or the second aspect.

[0028] In the embodiments of the present application, the terminal device can establish a dual-flow transmission to meet the service requirement when the first condition is met, that is, the first core network device instructs the terminal device to access the second core network device, or the first core network device instructs the terminal device to establish a dual-flow transmission, or the terminal device initiates a service that meets the triggering condition of the dual-flow transmission, and the terminal device can maintain single registration when the first condition is not met, so that the terminal device does not need to keep listening to the two radio access networks at all times, thereby reducing the power consumption of the terminal device and facilitating power saving of the terminal device. BRIEF DESCRIPTION OF DRAWINGS

[0029] FIG. 1 is a block diagram of a wireless communication system to which embodiments of the present application can be applied;

[0030] FIG. 2 is a schematic diagram of an application deployment scenario in the embodiments of the present application;

[0031] FIG. 3 is a schematic diagram of a core network dual-flow transmission architecture in the embodiments of the present application;

[0032] FIG. 4 is an uplink service flowchart in the embodiments of the present application;

[0033] FIG. 5 is a schematic diagram of a mapping relationship between a quality of service flow and an access node in the embodiments of the present application;

[0034] FIG. 6 is another schematic diagram of a mapping relationship between a quality of service flow and an access node in the embodiments of the present application;

[0035] FIG. 7 is a flowchart of a registration method in the embodiments of the present application;

[0036] FIG. 8 is a flowchart of another registration method in the embodiments of the present application;

[0037] FIG. 9 is a registration flowchart in the embodiments of the present application;

[0038] Fig. 10 is another registration flowchart in the embodiments of the present application;

[0039] Fig. 11 is still another registration flowchart in the embodiments of the present application;

[0040] Fig. 12 is another registration flowchart in the embodiments of the present application;

[0041] Fig. 13 is a structural block diagram of a registration apparatus in the embodiments of the present application;

[0042] Fig. 14 is another structural block diagram of a registration apparatus in the embodiments of the present application;

[0043] Fig. 15 is a structural block diagram of a communication device in the embodiments of the present application;

[0044] Fig. 16 is a structural block diagram of a terminal device in the embodiments of the present application;

[0045] Fig. 17 is a structural block diagram of a network side device in the embodiments of the present application;

[0046] Fig. 18 is another structural block diagram of a network side device in the embodiments of the present application. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be clearly described below with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0048] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second" are generally a category, and are not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally represents an "or" relationship between the associated objects before and after.

[0049] It is worth noting that the technology described in the embodiments of the present application is not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used in the above-mentioned systems and radio technologies, as well as in other systems and radio technologies. The following description describes a New Radio (NR) system for the purpose of example, and NR terminology is used in most of the following description, but these technologies can also be applied to applications other than NR system applications, such as 6th Generation (6G) communication systems. th

[0050] ​FIG. 1 shows a block diagram of a wireless communication system to which embodiments of the present application can be applied. The wireless communication system includes a terminal device 11 and a network side device 12. The terminal device 11 can be a terminal side device such as a mobile phone, a tablet personal computer (PC), a laptop PC, a personal digital assistant (PDA), a palm PC, a netbook, an ultra-mobile personal computer (UMPC), a mobile Internet device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, a vehicle-mounted device (VUE), a pedestrian terminal (PUE), a smart home (a home device with a wireless communication function such as a refrigerator, a television, a washing machine, or furniture, etc.), a game console, a personal computer (PC), a kiosk, or a self-service machine, etc. The wearable device includes a smart watch, a smart bracelet, a smart earphone, smart glasses, smart jewelry (a smart bracelet, a smart necklace, a smart ring, a smart necklace, a smart anklet, a smart necklace, etc.), a smart wristband, smart clothes, etc. It should be noted that the specific type of the terminal device 11 is not limited in the embodiments of the present application. The network side device 12 can include an access network device or a core network device. The access network device can also be referred to as a radio access network device, a radio access network (RAN), a radio access network function, or a radio access network unit. The access network device can include a base station, a WLAN access point, or a WiFi node, etc. The base station can be referred to as a node B, an evolved node B (eNB), an access point, a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a home node B, a home evolved node B, a transmitting receiving point (TRP), or some other appropriate terminology in the art, as long as the same technical effects are achieved. The base station is not limited to a specific technical term, and it should be noted that only the base station in the NR system is taken as an example for introduction in the embodiments of the present application, and the specific type of the base station is not limited.The core network device can include, but is not limited to, at least one of the following: a core network node, a core network function, a mobility management entity (MME), an access and mobility management function (AMF), a session management function (SMF), a user plane function (UPF), a policy control function (PCF), a policy and charging rules function (PCRF), an edge application server discovery function (EASDF), a unified data management (UDM), a unified data repository (UDR), a home subscriber server (HSS), a centralized network configuration (CNC), a network repository function (NRF), a network exposure function (NEF), a local NEF (or L-NEF), a binding support function (BSF), an application function (AF), and the like. It should be noted that only the core network device in the NR system is taken as an example for introduction in the embodiments of the present application, and the specific type of the core network device is not limited.

[0051] It should be noted that it is difficult to achieve full network synchronization deployment when the new system starts to be deployed, and usually some capacity hotspots are gradually deployed. Referring to FIG. 2, a schematic diagram of an application deployment scenario is shown. As shown in FIG. 2, some 6G base stations (especially for new spectrum capacity layer) and 5G base stations cannot be co-located / centrally deployed, and mobility and service continuity can only be ensured through handover or inter-radio access technology (IRAT) dual connectivity (DC). Handover has service interruption and performance loss, and IRAT DC is mainly for 5G non-standalone architecture (NSA) scenarios. For standalone architecture (SA) scenarios, deployment is rare, and the main reason is that inter-site coordination is complex and performance is difficult to guarantee, and cross-vendor implementation is even more difficult. Therefore, in actual networks, intra / inter-RAT coordination is mainly carrier aggregation (CA) and dynamic spectrum sharing (DSS), and there is basically no DC deployment. DC is a dual-flow splitting solution with a control node on the RAN side. In order to reduce the complex interaction on the radio access network (RAN) side, a scheme of splitting at a higher node is considered here, such as the core network (CN) user plane function (UPF) performing dual-flow operation. According to the deployment, two IRAT scenarios are considered, one is 6G new frequency cell and 5G cell coordination, and the other is 6G / 5G DSS cell and 5G cell coordination.

[0052] According to the above analysis, for the scenario that 6G cannot be continuously covered in the early stage of deployment, a cross-site solution needs to be considered, which can fully use network spectrum resources and terminal dual-transmit dual-receive capability to improve capacity while solving coverage and mobility. Dual-flow transmission (Dual steering or Dual Stack, DS) is expected to solve the above problems in a simpler and easier-to-deploy way, by semi-statically coordinating / splitting two RANs at a higher network node (such as 6GC / UPF), reducing the coupling between the two base stations, helping operators to smoothly upgrade 6G on the existing 5G network, ensuring terminal performance (experience rate / power saving), and better supporting cross-vendor deployment security.

[0053] Referring to FIG. 3, a schematic diagram of a core network dual-flow transmission architecture is shown. As shown in FIG. 3, the 6G and 5G base stations are connected to the unified 6G / 5G UPF / SMF, and the control plane is independently connected.

[0054] According to a deployment scenario, in order to support service dual connection, the UE can be registered and camped in 5G and 6G cells at the same time, two systems are independently paged, and the UE uplink initiates MO service, which can also be two systems at the same time or based on service attributes and signal quality to select one to initiate connection.

[0055] Referring to FIG. 4, an uplink service flowchart is shown. As shown in FIG. 4, two system RANs independently establish RRC and NAS connections, and are associated when subsequent user plane is established, and a DS bearer is established.

[0056] Referring to FIGS. 5 and 6, a service quality flow mapping relationship diagram with an access node is shown. As shown in FIG. 5, the UPF can select one quality of service (QoS) flow to map to one RAN node. Alternatively, as shown in FIG. 6, the UPF can select one QoS flow to map to two RAN nodes, i.e., split.

[0057] The registration method provided by the embodiments of the present application will be described in detail in combination with some embodiments and application scenarios.

[0058] The embodiments of the present application provide a registration method. Referring to FIG. 7, a flowchart of a registration method provided by the embodiments of the present application is shown. The method is applied to a terminal device, and as shown in FIG. 7, the method can specifically include:

[0059] Step 201, the terminal device establishes dual flow transmission under the condition that a first condition is met.

[0060] The first condition includes at least one of the following:

[0061] The terminal device receives a first message sent by the first core network device, and the first message carries a first indication; the first indication is used to instruct the terminal device to access a second core network device or to establish dual flow transmission;

[0062] The terminal main call service in the terminal device meets the trigger condition of dual flow transmission.

[0063] It should be noted that the terminal device in the present application can include a single SIM card terminal, and can also include a multi-SIM MUSIM terminal.

[0064] The terminal device in the present application is initially registered in the first core network device, and establishes dual flow transmission under the condition that the first condition is met.

[0065] The first core network device in the embodiments of the present application can be a core network device in a standalone networking scenario, for example, a 5G core network device or a 6G core network device; the first core network device can also be a core network device in a non-standalone networking scenario, for example, a 5G core network and a 6G core network are jointly designed, that is, the 6G core network is upgraded from the 5G core network, and the first core network device can access a 5G terminal or a 6G terminal.

[0066] The first message can be a paging message (Paging) or a non-access layer (Non-access stratum, NAS) message.

[0067] Exemplarily, the first core network device is a 6G core network device, and the UE is single-registered in the 6GC. In this scenario, if the paging message or the NAS message issued by the 6GC to the UE carries the first indication indicating that the UE accesses the 5G, after the UE receives the first indication, the UE establishes dual-flow transmission and initiates registration to the 5GC. For example, the UE turns on the receiver to search for a 5G cell, camps on and initiates RRC connection establishment. Alternatively, if there is a terminal-originated service, for example, a mobile-originate (MO) service, in the UE, the UE can analyze the service according to the pre-set trigger condition of the dual-flow transmission, and in the case that the terminal-originated service meets the trigger condition of the dual-flow transmission, the UE initiates registration to the 5GC and establishes dual-flow transmission.

[0068] In another possible application scenario of the present application, the first core network device is a 5G core network device, and the UE is single-registered in the 5GC. In this scenario, if the paging message or the NAS message issued by the 5GC to the UE carries the first indication indicating that the UE accesses the 6G, after the UE receives the first indication, the UE establishes dual-flow transmission and initiates registration to the 6GC. For example, the UE searches for a 6G cell, camps on and initiates RRC connection establishment. Alternatively, if there is a terminal-originated service, for example, an MO service, in the UE, the UE can analyze the service according to the pre-set trigger condition of the dual-flow transmission, and in the case that the terminal-originated service meets the trigger condition of the dual-flow transmission, the UE initiates registration to the 6GC and establishes dual-flow transmission.

[0069] In another possible application scenario of the present application, the 6G core network is upgraded from the 5G core network, and the first core network device is connected with a 5G access network node (for example, a 5G base station) and a 6G access network node (for example, a 6G base station). In this scenario, the terminal device can only register with the first core network device. When the terminal device is in an area covered by 6G, the UE can camp on a 6G cell; when the terminal device is in an area covered by 5G, the UE can camp on a 5G cell. Specifically, assuming that the UE camps on a 6G cell, the UE receives a paging message or a NAS message sent by the first core network device in the 6G cell, and the paging message or the NAS message carries a first indication indicating that the UE establishes dual-flow transmission, at this time, the UE can start searching for a 5G cell, selects one cell from the searched 5G cells to camp on and initiates RRC connection establishment. Alternatively, the UE has a terminal originating call service in the 6G cell, and the terminal originating call service meets the triggering condition of dual-flow transmission, at this time, the UE can start searching for a 5G cell, selects one cell from the searched 5G cells to camp on and initiates RRC connection establishment.

[0070] Similarly, assuming that the UE camps on a 5G cell, the UE receives a paging message or a NAS message sent by the first core network device in the 5G cell, and the paging message or the NAS message carries a first indication indicating that the UE establishes dual-flow transmission, at this time, the UE can start searching for a 6G cell, selects one cell from the searched 6G cells to camp on and initiates RRC connection establishment. Alternatively, the UE has a terminal originating call service in the 5G cell, and the terminal originating call service meets the triggering condition of dual-flow transmission, at this time, the UE can start searching for a 6G cell, selects one cell from the searched 6G cells to camp on and initiates RRC connection establishment.

[0071] In the embodiment of the present application, when the first condition is met, that is, the first core network device instructs the terminal device to access the second core network device, or the first core network device instructs the terminal device to establish dual-flow transmission, or the terminal originating call service meets the triggering condition of dual-flow transmission, the terminal device can establish dual-flow transmission to meet the service demand, and when the first condition is not met, the terminal device can maintain single registration, and the receiver of the terminal device for the two RANs does not need to always maintain listening, thereby reducing the power consumption of the terminal device and facilitating power saving of the terminal device.

[0072] In a possible application scenario of the present application, the terminal device is single-registered in a certain RAT, and when the DS service is initiated, the second RAT registration and the DS user plane are quickly started.

[0073] Optionally, the terminal device establishes dual-flow transmission when the first condition is met, and the method comprises the following steps.

[0074] S11, the terminal device receives a first paging message sent by the first core network device; the first paging message carries a first indication, and the first indication is used to instruct the terminal device to access a second core network device;

[0075] S12, the terminal device initiates registration to the second core network device according to the first indication.

[0076] In the embodiment of the present application, if the UE is single-registered in a certain RAT, a mobile terminated (MT) service arrives, and a paging message carries a first indication, which instructs the UE to access a second core network device. In this case, the UE can initiate registration to the second core network device while responding to the paging to initiate the service.

[0077] For example, the UE is single-registered in 6GC, an MT service arrives, and the 6GC carries a first indication in a first paging message sent to the UE, which instructs the UE to access 5G. After the UE receives the first paging message, the UE establishes a dual-flow transmission and initiates registration to 5GC. For example, the UE turns on the receiver to search for a 5G cell, camps on and initiates an RRC connection request.

[0078] Alternatively, the UE is single-registered in 5GC, an MT service arrives, and the 5GC carries a first indication in a first paging message sent to the UE, which instructs the UE to access 6G. After the UE receives the first paging message, the UE establishes a dual-flow transmission and initiates registration to 6GC. For example, the UE searches for a 6G cell, camps on and initiates an RRC connection.

[0079] Further, the first core network device addresses the second core network device through preset information; and the first core network device sends first information to the second core network device.

[0080] The first information includes at least one of the following:

[0081] The capability information of the terminal device;

[0082] The context information of the terminal device;

[0083] The service information of the terminal device.

[0084] In the embodiment of the present application, the first core network device can first address the second core network device through preset information, and then notify the second core network device of the related capability information, context information and service information of the terminal device, so that the second core network device finds the accessed UE, allocates an identity to the UE and triggers a user plane establishment process.

[0085] Optionally, the first core network device addresses the second core network device through preset information, including:

[0086] The first core network device determines a second core network device corresponding to the second radio access network by feeding back a node of the first radio access network corresponding to a neighboring node of the second radio access network or a tracking area identity; and the first core network device is a device in the first radio access network.

[0087] Exemplarily, assuming that a UE is single-registered in 6G, a first core network device is 6GC, and 6GC addresses a corresponding 5G AMF node through paging of a neighboring 5G RAN node and / or a tracking area identity (TAI) corresponding to the 6G RAN node, and notifies the 5G AMF of UE-related capability information, context information, and service information. Specifically, 6GC determines the corresponding 5G AMF node according to a list of RAN nodes of another RAT adjacent to the 6G RAN node, or 6GC finds a TAI to which a 5G RAN adjacent to the corresponding 6G base station belongs, and thereby finds the corresponding 5G AMF, through a pre-stored 5G-6G TAI mapping table. The 5G AMF finds the accessed UE through association of a UE IMSI or a 6G TMSI or a 6G GUTI, allocates a 5G ID to the UE, and triggers a user plane establishment process. This process can be transparent to the 5G RAN.

[0088] Optionally, the method further includes:

[0089] S21, the terminal device receives a first non-access stratum message sent by the first core network device; the first non-access stratum message is used to notify the terminal device to initiate a communication connection with the second core network device;

[0090] S22, the terminal device initiates registration with the second core network device.

[0091] In the embodiments of the present application, after the first core network device completes interaction with the second core network device, the first non-access stratum (NAS) message can be used to notify the UE to initiate a communication connection with the second core network device.

[0092] Exemplarily, assuming that a UE is single-registered in 6G, a first core network device is 6GC, and a second core network device is 5GC, when 6GC completes interaction with 5GC, a subsequent 6G NAS message can be used to notify the UE to initiate link establishment.

[0093] Optionally, the first non-access stratum message carries an identity allocated to the terminal device by the second core network device.

[0094] Alternatively, after receiving the first paging message, the terminal device can first search for a cell corresponding to the second core network device and camp on, and wait for the second core network device to page the terminal device after the first core network device and the second core network device interact.

[0095] For example, it is assumed that the UE is single-registered in 6G, the first core network device is 6GC, the second core network device is 5GC, and the UE first searches for a 5G cell and camps on after receiving the first paging message of 6GC, and waits for the 5GC to page the UE after the 6GC completes interaction with the 5GC. The paging ID of the 5GC can be obtained from the 6G system.

[0096] Optionally, the method further includes:

[0097] The terminal device sends a first service request message to the first core network device.

[0098] The first service request message carries a second indication, and the second indication is used to indicate whether a cell corresponding to the second core network device is found.

[0099] In the embodiments of the present application, the terminal device can notify whether a cell corresponding to the second core network device is found through a first service request message (for example, a service request NAS message).

[0100] Optionally, before the terminal device sends the first service request message to the first core network device, the method further includes:

[0101] The terminal device acquires at least one of a tracking area identifier, a core network identifier, and a cell identifier corresponding to the second core network device in a system information block (SIB) or a management information base (MIB) of a second radio access network cell to which the second core network device belongs.

[0102] Optionally, the second indication includes at least one of the tracking area identifier, the core network identifier, and the cell identifier corresponding to the second core network device.

[0103] As an example, assume that the UE is single registered in 6G, the first core network device is 6GC, the second core network device is 5GC, and the UE informs 6GC in the 6G service request NAS message whether a suitable 5G cell is found around. Optionally, the 6G service request NAS message includes a second indication, which includes at least one of the TAI, the core network identifier and the cell ID obtained by the UE from the 5G system message block (System Information Block, SIB) or the management information base (Management Information Base, MIB). 6GC addresses the corresponding 5G AMF according to these information and triggers registration preparation and DS establishment. If the UE cannot find a suitable 5G cell, the 6GC is informed in the NAS message that there is no 5G coverage, and the single flow configuration is performed for the service.

[0104] Optionally, the method further comprises:

[0105] The terminal device sends a second service request message to the second core network device.

[0106] The second service request message carries at least one of the following:

[0107] A first reason value, the first reason value is used to indicate that the request reason is to establish a dual-flow transmission;

[0108] The identity of the terminal device in the first core network device;

[0109] At least one of the tracking area identifier, the core network identifier and the cell identifier corresponding to the first core network device.

[0110] The identity of the terminal device in the first core network device can include at least one of the international mobile subscriber identity (International Mobile Subscriber Identity, IMSI), the temporary mobile subscriber identity (Temporary Mobile Subscriber Identity, TMSI) and the globally unique temporary UE identifier (Globally Unique Temporary UE Identity, GUTI).

[0111] After the terminal device initiates the registration to the second core network device, the terminal device can carry the first cause value, an international mobile subscriber identity (IMSI) or a temporary mobile subscriber identity (TMSI) or a globally unique temporary UE identity (GUTI) of the UE in the first core network device, and at least one of a TAI, a core network identifier, and a cell identifier corresponding to the first core network device in a second service request message (for example, a service request NAS message), so that the second core network device addresses the first core network device according to the information and triggers user plane DS establishment.

[0112] Exemplarily, assuming that the UE is single-registered in 6G, the first core network device is 6GC, and the second core network device is 5GC, the UE can carry a DS cause value (indicating that the request reason is to establish dual-stream transmission), an IMSI or a TMSI of the UE in 6G, and at least one of a TAI / cell ID / core network identifier of a 6G access cell in a service request NAS message after the UE initiates access in 5G. The 5G-AMF addresses the 6G AMF and corresponding UPF / SMF according to the above information and triggers DS establishment.

[0113] Optionally, the terminal device establishes dual-stream transmission in a case where the first condition is met, including:

[0114] S31, the terminal device initiates a terminal main call service to the first core network device.

[0115] S32, the terminal device initiates registration to a second core network device in a case where the terminal main call service meets a trigger condition of dual-stream transmission.

[0116] In the embodiment of the application, the terminal device is single-registered in a certain RAT, the terminal device initiates a terminal main call service, that is, an MO service, to the first core network device, and the terminal device can determine whether the service meets a trigger condition of dual-stream transmission according to a pre-set trigger condition of dual-stream transmission, and initiates registration to a second core network device in a case where the service meets the trigger condition of dual-stream transmission.

[0117] It should be noted that the trigger condition of dual-stream transmission can be configured by the first core network device according to service policies, service transmission requirements, and the like.

[0118] Exemplarily, assuming that the UE is single-registered in 6G, the first core network device is 6GC, and the second core network device is 5GC, the UE initiates an MO service to 6GC, and initiates registration to 5G in a case where the MO service meets a trigger condition of dual-stream transmission.

[0119] It can be understood that the process of UE initiating 5G registration is similar to the process of UE initiating 5G registration in the case of MT service arrival. The 6GC can address the 5G-AMF through preset information and interact with the UE context, capability information and service information. The 5G AMF finds the accessed UE through the UE IMSI or 6G TMSI association, allocates a 5G ID for it and triggers the user plane establishment process.

[0120] Optionally, the terminal device initiates the registration with the second core network device in a case that the terminal device initiates the call service and the call service meets the triggering condition of the dual-flow transmission.

[0121] The terminal device receives a second non-access stratum message sent by the first core network device, and the second non-access stratum message is used to indicate that the terminal call service meets the triggering condition of the dual-flow transmission.

[0122] In the embodiment of the application, the terminal device can also initiate the MO service in the registered cell first, and then the first core network device judges whether the MO service meets the triggering condition of the dual-flow transmission. After determining that the MO service meets the triggering condition of the dual-flow transmission, the first core network device sends a second non-access stratum message (NAS message) to the terminal device, indicating that the terminal call service meets the triggering condition of the dual-flow transmission. After receiving the second non-access stratum message, the terminal device initiates the registration with the second core network device.

[0123] Optionally, the terminal device initiates the registration with the second core network device, including:

[0124] S51, the terminal device searches a cell corresponding to the second core network device;

[0125] S52, the terminal device selects a camping cell in the searched candidate cell, and initiates the registration with the second core network device in the camping cell.

[0126] The terminal device can search the cell corresponding to the core network device in the registered cell, select a camping cell in the searched candidate cell, and initiate the registration with the second core network device in the camping cell.

[0127] Exemplarily, assuming that the UE is registered in the 6G, the UE can search the 5G cell in the 6G cell in a case that the UE receives the first paging message of the 6GC or the MO service initiated by the UE meets the triggering condition of the dual-flow transmission, select a camping cell from the searched 5G cell, and initiate the registration with the 5GC in the camping 5G cell.

[0128] Optionally, the terminal device initiates the registration with the second core network device in a case that the terminal device initiates the call service and the call service meets the triggering condition of the dual-flow transmission, including:

[0129] S61, the terminal device searches for a cell corresponding to the second core network device in a case where the terminal device initiates a terminal call service that meets a triggering condition of dual-stream transmission.

[0130] S62, the terminal device initiates registration to the second core network device in a case where the terminal device receives a second paging message sent by the second core network device.

[0131] The terminal device can also search for a cell corresponding to the second core network device and camp on the cell in a case where an MO service meets a triggering condition of dual-stream transmission, wait for the first core network device and the second core network device to interact, and then establish a connection with the second core network device after the second core network device pages the terminal device.

[0132] It should be noted that the registration method in the embodiments of the present application can be extended to a general dual-registration scenario. For example, a UE first performs boot-up registration in 5G, triggers 6G registration when there is 6G coverage, and provides 5G RAT related information in a container during 6G link establishment. The 5G RAT related information is forwarded to the 5GC by the 6GC, and the 5GC only needs to parse the data using the 5G RAT key in the container to directly obtain the related information, without waiting for the 6G to complete all registration security authentication information and then transmitting 5G / 6G association information.

[0133] In another possible application scenario of the present application, a terminal device is registered in a single RAT, a DS needs to be established when there is a service, and the other RAT accesses the CN in an NSA manner.

[0134] Optionally, the first core network device is connected with a first access network device and a second access network device, the first access network device belongs to a first radio access technology, and the second access network device belongs to a second radio access technology.

[0135] The terminal device establishes dual-stream transmission in a case where a first condition is met, including:

[0136] The terminal device searches for a second cell and camps on the second cell in a case where the terminal device receives a first message sent by the first core network device in a first cell, or in a case where a terminal call service initiated by the terminal device in the first cell meets a triggering condition of dual-stream transmission, and sends an access request to a target access network device in the second cell.

[0137] The first cell is a cell of the first radio access technology, the second cell is a cell of the second radio access technology, and the target access network device is the second access network device.

[0138] The first cell is a cell of the second radio access technology, the second cell is a cell of the first radio access technology, and the target access network device is the first access network device.

[0139] When the 5G / 6G core network is jointly designed, i.e., the 6G core network is upgraded from the 5G core network, the 6G core network can access 6G terminals and 5G terminals, and is connected to the 5G RAN Node through the Ng interface defined by the 5G protocol. In this scenario, the UE can only register with this unified core network, and when the UE is in a 6G coverage area, it is camped on a 6G cell, otherwise it is camped on a 5G cell, or it selects a RAT to camp according to a network configuration policy.

[0140] For example, assuming that the UE is camped on a 6G cell, the UE receives a first message (including a paging message or a NAS message) sent by the first core network device in the 6G cell, and the first message carries a first indication indicating that the UE establishes dual-stream transmission. At this time, the UE can start searching for a 5G cell, select a cell from the searched 5G cells to camp on, and send an access request to the 5G access network device. Alternatively, the UE has a terminal call service in the 6G cell, and the terminal call service meets the trigger condition of dual-stream transmission. At this time, the UE can start searching for a 5G cell, select a cell from the searched 5G cells to camp on, and send an access request to the 5G access network device.

[0141] Similarly, assuming that the UE is camped on a 5G cell, the UE receives a first message sent by the first core network device in the 5G cell, and the first message carries a first indication indicating that the UE establishes dual-stream transmission. At this time, the UE can start searching for a 6G cell, select a cell from the searched 6G cells to camp on, and send an access request to the 6G access network device. Alternatively, the UE has a terminal call service in the 5G cell, and the terminal call service meets the trigger condition of dual-stream transmission. At this time, the UE can start searching for a 6G cell, select a cell from the searched 6G cells to camp on, and send an access request to the 6G access network device.

[0142] Optionally, the method further includes:

[0143] The terminal device sends a first uplink message to the access network device corresponding to the first cell.

[0144] The first uplink message carries at least one of a tracking area identifier, a core network identifier, and a cell identifier of the second cell searched by the terminal device.

[0145] The terminal device can inform the first cell corresponding access network device of at least one of the TAI, the core network identifier and the cell identifier of the searched second cell through a first uplink message, such as an RRC connection establishment message or a NAS message.

[0146] Optionally, the method further comprises:

[0147] The terminal device sends a second uplink message to the target access network device, and the second uplink message carries at least one of the tracking area identifier, the core network identifier and the cell identifier of the first cell.

[0148] The terminal device can inform the target access network device of at least one of the TAI, the core network identifier and the cell identifier of the first cell through a second uplink message, such as an RRC connection establishment message or a NAS message, thereby helping the target access network device to find the corresponding first core network device.

[0149] As an example, assuming that the UE is camped in a 6G cell, the UE receives a paging message in the 6G cell indicating that an MT service arrives while indicating to establish a DS service, the UE initiates a service request in response to the paging in the 6G cell while starting to search for a 5G cell, camps and initiates an RRC connection establishment. The 5G gNB is informed in the RRC connection establishment message, so that the 5G gNB selects a node designed in combination of 5G / 6G to access in the subsequent connection establishment process. Optionally, the UE can inform the 6G network of at least one of the TAI, the core network identifier and the cell ID of the searched 5G cell in the RRC connection establishment message or the NAS message, or inform the 5G network of at least one of the TAI, the core network identifier and the cell ID of the 6G cell in the RRC connection establishment message or the NAS message, thereby helping the 5G base station to find the corresponding core network designed in combination. The 5G gNB sends a service request carrying DS response information to the 6GC as a secondary node. The 6GC informs the SMF / UPF to establish a 5G user plane connection (without a control plane connection).

[0150] Optionally, the method further comprises:

[0151] S81, the terminal device performs cell measurement on the searched second cell to obtain cell information of the second cell;

[0152] S82, the terminal device sends the cell information to the first cell corresponding access network device.

[0153] Exemplarily, assuming that the UE is camped in a 6G cell, the UE has a terminal originating service in the 6G cell, and the terminal originating service meets the triggering condition of dual-flow transmission, at this time the UE can start searching for a 5G cell, select a cell from the searched 5G cells, camp in the selected cell, and initiate RRC connection establishment.

[0154] In addition, the UE can perform cell measurement on the searched 5G cell, send the measured cell information to the access network device corresponding to the 6G cell, and forward the cell information of the 5G cell to the first core network device by the access network device (for example, 6G Node) corresponding to the 6G cell.

[0155] Similarly, assuming that the UE is camped in a 5G cell, the UE has a terminal originating service in the 5G cell, and the terminal originating service meets the triggering condition of dual-flow transmission, at this time the UE can start searching for a 6G cell, the UE performs cell measurement on the searched 6G cell, sends the measured cell information to the access network device corresponding to the 5G cell, and forwards the cell information of the 6G cell to the first core network device by the access network device (for example, 5G gNB) corresponding to the 5G cell.

[0156] Optionally, the method further comprises:

[0157] The terminal device sends a third uplink message to the first core network device, and the third uplink message carries the cell information of the second cell.

[0158] The terminal device can send the cell information of the second cell to the first core network device through a third uplink message, for example, a NAS message, and the first core network device directly establishes the first radio access system and the second radio access system.

[0159] For example, assuming that the UE is camped in a 6G cell, the UE carries 5G cell information in a 6G MO uplink NAS message, and the 6GC directly establishes 6G and 5G RAN.

[0160] Optionally, the terminal device searches for the second cell in the case where the terminal originating service meets the triggering condition of dual-flow transmission, comprising:

[0161] S91, the terminal device receives a second non-access layer message sent by the first core network device; the second non-access layer message is used to indicate that the terminal originating service meets the triggering condition of dual-flow transmission;

[0162] S92, the terminal device searches for the second cell.

[0163] The terminal device can also initiate an MO service in the registered cell first, and the first core network device determines whether the MO service meets the triggering condition of dual-flow transmission according to the service type and the service policy. The first core network device sends a second non-access stratum message (NAS message) to the terminal device after determining that the MO service meets the triggering condition of dual-flow transmission, to instruct the terminal device that the MO service meets the triggering condition of dual-flow transmission. After receiving the second non-access stratum message, the terminal device searches for a second cell and selects a cell to camp on in the searched second cell.

[0164] For example, assuming that the UE camps on a 6G cell, the UE can also initiate an MO service in the 6G cell first, and the 6GC determines whether to establish a 5G connection according to the service type and the policy. In a case where it is determined to establish a 5G connection, the 6GC notifies the UE to establish by means of a NAS message. The UE performs search and access of the 5G cell only after receiving the indication of the NAS message.

[0165] It can be understood that the UE performs 6G search and camping when the UE is in 5G single registration and MT / MO. If there is 6G coverage, the process is the same as above. If there is no 6G coverage, the NAS message carries an indication to notify the 5GC, and the 5GC can directly establish a 5G single link.

[0166] The registration method provided in the embodiments of the present application can be used. When the first condition is met, that is, the first core network device instructs the terminal device to access the second core network device, or the first core network device instructs the terminal device to establish dual-flow transmission, or the MO service meets the triggering condition of dual-flow transmission, the terminal device can establish dual-flow transmission to meet the service requirement. When the first condition is not met, the terminal device can maintain single registration. The receiver of the terminal device for the two RANs does not need to always maintain listening, which reduces the power consumption of the terminal device and is beneficial to power saving of the terminal device.

[0167] The embodiments of the present application also provide another registration method. Referring to FIG. 8, a flowchart of a registration method provided by the embodiments of the present application is shown. The method is applied to a first core network device. As shown in FIG. 8, the method can specifically include the following steps:

[0168] In step 301, the first core network device sends a first message to the terminal device.

[0169] The first message carries a first indication. The first indication is used to instruct the terminal device to access the second core network device, or to instruct the terminal device to establish dual-flow transmission.

[0170] The first core network device in the embodiments of the present application can be a core network device in a standalone networking scenario, for example, a 5G core network device or a 6G core network device; the first core network device can also be a core network device in a non-standalone networking scenario, for example, a 5G core network and a 6G core network are jointly designed, that is, the 6G core network is upgraded from the 5G core network, and the first core network device can access a 5G terminal or a 6G terminal.

[0171] The first message can be a paging message (Paging) or a non-access layer (Non-access stratum, NAS) message.

[0172] Exemplarily, the first core network device is a 6G core network device, and the UE is single-registered in the 6GC. In this scenario, if the paging message or the NAS message sent by the 6GC to the UE carries the first indication, indicating that the UE accesses the 5G or indicating that the terminal device establishes dual-flow transmission, after receiving the first indication, the UE establishes dual-flow transmission and initiates registration to the 5GC. For example, the UE turns on the receiver to search for a 5G cell, camps on and initiates RRC connection establishment.

[0173] In another possible application scenario of the present application, the first core network device is a 5G core network device, and the UE is single-registered in the 5GC. In this scenario, if the paging message or the NAS message sent by the 5GC to the UE carries the first indication, indicating that the UE accesses the 6G or indicating that the terminal device establishes dual-flow transmission, after receiving the first indication, the UE establishes dual-flow transmission and initiates registration to the 6GC. For example, the UE searches for a 6G cell, camps on and initiates RRC connection establishment.

[0174] In another possible application scenario of the present application, the 6G core network is upgraded from the 5G core network, and the first core network device is connected with a 5G access network node (for example, a 5G base station) and a 6G access network node (for example, a 6G base station). In this scenario, the terminal device can be registered only with the first core network device. When the terminal device is located in an area covered by the 6G, the UE can camp on a 6G cell; when the terminal device is located in an area covered by the 5G, the UE can camp on a 5G cell. Specifically, assuming that the UE camps on a 6G cell, the UE receives the paging message or the NAS message sent by the first core network device in the 6G cell, and the paging message or the NAS message carries the first indication, indicating that the UE establishes dual-flow transmission, at this time, the UE can start searching for a 5G cell, selects a cell from the searched 5G cells to camp on and initiates RRC connection establishment.

[0175] Optionally, the first core network device sends the first message to the terminal device, comprising:

[0176] The first core network device sends a first paging message to the terminal device; the first paging message carries a first indication, and the first indication is used to instruct the terminal device to access a second core network device.

[0177] In the embodiments of the present application, if the UE is single-registered in a certain RAT, MT service arrives, and a paging message carries a first indication, instructing the UE to access a second core network device. In this case, the UE can initiate registration to the second core network device while responding to the paging to initiate the service.

[0178] For example, the UE is single-registered in 6GC, MT service arrives, and the first paging message sent by 6GC to the UE carries a first indication, instructing the UE to access 5G. After receiving the first paging message, the UE establishes dual-stream transmission and initiates registration to 5GC. For example, the UE turns on the receiver to search for a 5G cell, camps on and initiates an RRC connection request.

[0179] Alternatively, the UE is single-registered in 5GC, MT service arrives, and the first paging message sent by 5GC to the UE carries a first indication, instructing the UE to access 6G. After receiving the first paging message, the UE establishes dual-stream transmission and initiates registration to 6GC. For example, the UE searches for a 6G cell, camps on and initiates an RRC connection.

[0180] Optionally, the method further comprises:

[0181] P11, the first core network device addresses the second core network device through preset information;

[0182] P12, the first core network device sends first information to the second core network device.

[0183] The first information includes at least one of the following:

[0184] The capability information of the terminal device;

[0185] The context information of the terminal device;

[0186] The service information of the terminal device.

[0187] In the embodiments of the present application, the first core network device can first address the second core network device through preset information, and then notify the second core network device of the related capability information, context information and service information of the terminal device, so that the second core network device finds the accessed UE, allocates an identity to the UE and triggers a user plane establishment process.

[0188] Optionally, the first core network device addresses the second core network device through preset information, comprising:

[0189] The first core network device determines the second core network device corresponding to the second wireless access network through the node or tracking area identity of the adjacent node of the first wireless access network feeding back the paging response.

[0190] Exemplarily, assuming that the UE is single-registered in 6G, the first core network device is 6GC, and the 6GC addresses the corresponding 5G AMF node through paging the adjacent 5G RAN node and / or tracking area identity (TAI) of the corresponding 6G RAN node, and notifies the 5G AMF of the UE-related capability information, context information and service information.

[0191] Optionally, the first core network device determines the second core network device corresponding to the second wireless access network through the node or tracking area identity of the adjacent node of the first wireless access network feeding back the paging response, comprising:

[0192] P21, the first core network device determines the second core network device according to the node list of the second wireless access network adjacent to the node of the first wireless access network; or,

[0193] P22, the first core network device determines the target tracking area identity of the second wireless access network adjacent to the node of the first wireless access network according to the tracking area mapping table of the first wireless access network and the second wireless access network, and determines the second core network device according to the target tracking area identity.

[0194] Exemplarily, assuming that the UE is single-registered in 6G, the first core network device is 6GC, and the 6GC determines the corresponding 5G AMF node according to the node list of the RAN node of another RAT adjacent to the 6G RAN node, or finds the TAI to which the 5G RAN adjacent to the corresponding 6G base station belongs through the pre-stored 5G-6G TAI mapping table, so as to find the corresponding 5G AMF. The 5G AMF finds the accessed UE through the UE IMSI or 6G TMSI association, allocates a 5G ID for the UE and triggers a user plane establishment process. The process can be transparent to the 5G RAN.

[0195] Optionally, the method further comprises:

[0196] The first core network device sends a first non-access layer message to the terminal device; the first non-access layer message is used to notify the terminal device to initiate a communication connection with the second core network device.

[0197] In the embodiments of the present application, after the first core network device completes the interaction with the second core network device, the UE can be notified to initiate a communication connection with the second core network device through a first non-access stratum (Non-access stratum, NAS) message.

[0198] For example, assuming that the UE is single-registered in 6G, the first core network device is 6GC, and the second core network device is 5GC, when the 6GC completes the interaction with the 5GC, the UE can be notified to initiate a link establishment through a subsequent 6G NAS message.

[0199] Optionally, the first non-access stratum message carries an identity allocated by the second core network device for the terminal device.

[0200] Optionally, the first indication is used to instruct the terminal device to access the second core network device; and the method further comprises:

[0201] The first core network device receives a first service request message sent by the terminal device.

[0202] The first service request message carries a second indication, and the second indication is used to indicate whether a service cell corresponding to the second core network device is found.

[0203] In the embodiments of the present application, the terminal device can notify whether a cell corresponding to the second core network device is found through a first service request message (for example, a service request NAS message).

[0204] Optionally, the second indication includes at least one of a tracking area identity, a core network identity, and a cell identity corresponding to the second core network device.

[0205] For example, assuming that the UE is single-registered in 6G, the first core network device is 6GC, and the second core network device is 5GC, the UE notifies the 6GC in a 6G service request NAS message whether a suitable 5G cell is found around the 6GC. Optionally, the 6G service request NAS message includes a second indication, and the second indication includes at least one of a TAI, a core network identity, and a cell identity (cell ID) obtained by the UE from a 5G system information block (System Information Block, SIB). The 6GC addresses the corresponding 5G AMF according to the information and triggers a registration preparation and a DS establishment. If the UE cannot find a suitable 5G cell, the 6GC is notified in the NAS message that there is no 5G coverage, and a single-flow configuration is performed for the service.

[0206] In another possible application scenario of the present application, the terminal device is single-registered in a certain RAT, when there is a service that needs to establish a DS, and a DS user plane configuration can be established, another RAT accesses the CN in an NSA manner.

[0207] Optionally, the first core network device is connected with a first access network device and a second access network device, the first access network device belongs to a first wireless access standard, and the second access network device belongs to a second wireless access standard.

[0208] Optionally, the method further comprises:

[0209] P31, the first core network device receives a third uplink message sent by the terminal device; the third uplink message carries cell information of a second cell;

[0210] P32, the first core network device establishes a communication connection with an access network device corresponding to the second cell according to the cell information.

[0211] The second cell is a cell of the second wireless access standard, or the second cell is a cell of the first wireless access standard.

[0212] When the 5G / 6G core network is jointly designed, i.e., the 6G core network is upgraded from the 5G core network, the 6G core network can access 6G terminals and 5G terminals, and is connected to the 5G RAN node through the Ng interface defined by the 5G protocol. In this scenario, the UE can only be registered with this unified core network, and when the UE is in an area covered by 6G, it is camped on a 6G cell, otherwise it is camped on a 5G cell.

[0213] Illustratively, assuming that the UE is camped on a 6G cell, the UE receives a first paging message sent by the first core network device in the 6G cell, the first paging message carries a first indication indicating that the UE establishes a dual-stream transmission, at this time the UE can start searching for a 5G cell, selects a cell from the searched 5G cells and camps on the cell and sends an access request to the 5G access network device.

[0214] Similarly, assuming that the UE is camped on a 5G cell, the UE receives a first paging message sent by the first core network device in the 5G cell, the first paging message carries a first indication indicating that the UE establishes a dual-stream transmission, at this time the UE can start searching for a 6G cell, selects a cell from the searched 6G cells and camps on the cell and sends an access request to the 6G access network device.

[0215] The terminal device can send the cell information of the second cell to the first core network device through a third uplink message, such as a NAS message, and the first core network device directly establishes the first wireless access standard and the second wireless access standard.

[0216] For example, assuming that the UE is camped in a 6G cell, the UE carries 5G cell information in a 6G MO uplink NAS message, and the 6GC directly establishes 6G and 5G RANs.

[0217] Optionally, the method further comprises:

[0218] P41, the first core network device receives the terminal main call service;

[0219] P42, the first core network device sends a second non-access layer message to the terminal device in the case that the terminal main call service meets the triggering condition of dual-flow transmission; the second non-access layer message is used to indicate that the terminal main call service meets the triggering condition of dual-flow transmission.

[0220] The terminal device can also initiate an MO service in a registered cell first, and the first core network device judges whether the MO service meets the triggering condition of dual-flow transmission according to the service type and the service policy. The first core network device sends a second non-access layer message (NAS message) to the terminal device after determining that the MO service meets the triggering condition of dual-flow transmission, indicating that the terminal main call service meets the triggering condition of dual-flow transmission. After receiving the second non-access layer message, the terminal device searches for a second cell and selects a cell to camp in the searched second cell.

[0221] For example, assuming that the UE is camped in a 6G cell, the UE can also initiate an MO service in the 6G cell first, and the 6GC judges whether to establish a 5G connection according to the service type and the policy. In the case that it is determined to establish a 5G connection, the 6GC notifies the UE to establish through a NAS message. The UE receives the indication of the NAS message and then searches for and accesses the 5G cell.

[0222] Optionally, the method further comprises:

[0223] The first core network device configures security parameters for the first access network device and the second access network device respectively.

[0224] The security parameters include at least one of the following:

[0225] A security algorithm;

[0226] An integrity protection algorithm;

[0227] A key;

[0228] An initial count value.

[0229] In a non-standalone networking scenario, the first core network device is connected with a first access network device (for example, a 6G base station) and a second access network device (for example, a 5G base station), the first core network device can configure dedicated security parameters for the first access network device and the second access network device, and the first access network device and the second access network device obtain the security parameters from the first core network device and configure the UE through an RRC message.

[0230] The registration method provided by the embodiments of the present application will be illustrated below in combination with specific application scenarios.

[0231] Referring to FIG. 9, a registration flowchart provided by an embodiment of the present application is shown. As shown in FIG. 9, the UE is registered in 6G, the first core network device is 6GC-AMF, the second core network device is 5GC-AMF, the 6GC instructs the UE to establish DS through a paging message, and the specific steps can include the following steps:

[0232] 1. The UE initiates initial registration to the 6GC-AMF.

[0233] 2. The 6GC-AMF issues a paging message to the UE, and the paging Paging carries a registration indication.

[0234] 3. The UE responds to the Paging and initiates RRC link establishment to the 6G Node. The 6G Node forwards the Paging response of the UE to the 6GC-AMF.

[0235] 4. The 6GC-AMF finds the corresponding 5GC-AMF through the 6G Node of the Paging response to interact with the UE context and prepare the user plane establishment.

[0236] 5. The UE initiates RRC link establishment to the 5G gNB and initiates registration. The 5G gNB initiates registration to the 5GC-AMF.

[0237] 6. The 6GC-AMF performs 6G NAS connection / security verification on the UE.

[0238] 7. The 5G UPF / SMF sends a DS establishment indication to the 5GC-AMF.

[0239] 8. The 6G UPF / SMF and the UE perform 6G user plane establishment.

[0240] 9. The 5GC-AMF and the UE perform 5GC registration.

[0241] 10. The 5GC-AMF performs 5G NAS connection / security verification on the UE.

[0242] 11. The 5G UPF / SMF and the UE perform 5G user plane establishment.

[0243] Referring to FIG. 10, another registration flowchart provided by the embodiment of the application is shown. As shown in FIG. 10, the UE is registered in 6G, the first core network device is 6GC-AMF, the second core network device is 5GC-AMF, the UE performs DS establishment in the case that the MO service meets the trigger condition of double-flow transmission, and the specific process can include the following steps:

[0244] 1. The UE initiates initial registration to the 6GC-AMF.

[0245] 2. The UE initiates MO service through RRC connection establishment.

[0246] 3. The 6G Node initiates MO NAS connection establishment to the 6GC-AMF.

[0247] 4. The 6GC-AMF finds the corresponding 5GC-AMF through the 6G Node to perform UE context interaction and user plane establishment preparation.

[0248] 5. The UE performs RRC connection establishment to the 5G gNB to initiate registration. The 5G gNB initiates registration to the 5GC-AMF.

[0249] 6. The 6GC-AMF performs 6G NAS connection / safety verification on the UE.

[0250] 7. The 5G UPF / SMF sends a DS establishment indication to the 5GC-AMF.

[0251] 8. The 6G UPF / SMF and the UE perform 6G user plane establishment.

[0252] 9. The 5GC-AMF and the UE perform 5GC registration / authentication.

[0253] 10. The 5GC-AMF enters the connected state to perform data transmission.

[0254] 11. The 5G UPF / SMF and the UE perform 5G user plane establishment.

[0255] Referring to FIG. 11, another registration flowchart provided by the embodiment of the application is shown. As shown in FIG. 11, the UE is registered in 6G, the first core network device is 6GC-AMF, the 6GC-AMF connects the 6G Node and the 5G gNB, the 6GC performs DS establishment through a paging message, and the specific process can include the following steps:

[0256] 1. The UE initiates initial registration to the 6GC-AMF.

[0257] 2. The 6GC-AMF sends a paging message to the UE, and the paging message carries a DS indication.

[0258] The UE performs 5G cell search and camping, specifically including the following steps 3-6:

[0259] 3. The UE sends a paging response to the 6G Node, which can carry 5G RAN information. The 6G Node forwards the paging response of the UE to the 6GC-AMF.

[0260] 4. The UE performs RRC connection to the 5G gNB and initiates DS. The 5G gNB sends a DS connection request to the 6GC-AMF. The 6GC-AMF feeds back a response to the 5G gNB.

[0261] 5. The 6G UPF / SMF sends a DS establishment indication to the 6GC-AMF.

[0262] 6. The 6GC-AMF performs 6G NAS connection / security verification on the UE.

[0263] Further, the 6GC-AMF can indicate the UE to establish a 5G connection through a NAS message. The UE initiates RRC connection to the 5G gNB according to the NAS indication.

[0264] 7. The 6G UPF / SMF and the UE perform 6G user plane establishment.

[0265] 8. The UE and the 5GC gNB perform RRC connection.

[0266] 9. The 5G UPF / SMF and the UE perform 5G user plane establishment.

[0267] Referring to FIG. 12, another registration flowchart provided by the embodiments of the present application is shown. As shown in FIG. 12, the UE is registered in 6G, the first core network device is 6GC-AMF, the 6GC-AMF is connected with the 6G Node and the 5G gNB, and the UE performs DS establishment when the MO service meets the triggering condition of dual-flow transmission, which can specifically include the following steps:

[0268] 1. The UE initiates initial registration to the 6GC-AMF.

[0269] The UE has an MO service to be initiated, and according to the service policy, performs 5G cell search and camping when the MO service meets the triggering condition of dual-flow transmission, which specifically includes the following steps 2-5:

[0270] 2. The UE initiates the MO service by performing RRC connection with the 6G Node. The RRC connection message can carry 5G RAN information. The 6G Node sends a NAS message carrying the 5G RNA information to the 6GC-AMF.

[0271] 3. The UE performs RRC connection with the 5G gNB, initiates the DS. The 5G gNB sends a DS connection request to the 6GC-AMF. The 6GC-AMF feeds back a response to the 5G gNB.

[0272] 4. The 6G UPF / SMF sends a DS establishment indication to the 6GC-AMF.

[0273] 5. The 6GC-AMF performs 6G NAS connection / security verification on the UE.

[0274] Further, the 6GC-AMF can instruct the UE to establish a 5G connection through a NAS message. The UE initiates RRC connection with the 5G gNB according to the NAS instruction.

[0275] 6. The 6G UPF / SMF and the UE perform 6G user plane establishment.

[0276] 7. The UE and the 5GC gNB perform RRC connection.

[0277] 8. The 5G UPF / SMF and the UE perform 5G user plane establishment.

[0278] To sum up, the embodiment of the present application provides a registration method. In the case of meeting the first condition, that is, the first core network device instructs the terminal device to access the second core network device, or the first core network device instructs the terminal device to establish a dual-flow transmission, or the terminal main call service meets the trigger condition of the dual-flow transmission, the terminal device can establish a dual-flow transmission to meet the service demand. In the case of not meeting the first condition, the terminal device can maintain single registration. The terminal device does not need to keep listening to the two wireless access networks all the time, which reduces the power consumption of the terminal device and is beneficial to power saving of the terminal device.

[0279] The registration method provided by the embodiment of the present application can be executed by a registration device. In the embodiment of the present application, the registration method executed by the registration device is taken as an example to illustrate the registration device provided by the embodiment of the present application.

[0280] Referring to FIG. 13, a structural block diagram of a registration device provided by an embodiment of the present application is shown. The device can be applied to a terminal device. As shown in FIG. 13, the device can specifically include:

[0281] The transmission establishment module 401 is configured to establish a dual-flow transmission in the case of meeting a first condition.

[0282] The first condition includes at least one of the following:

[0283] The terminal device receives a first message sent by the first core network device, and the first message carries a first indication; the first indication is used to indicate that the terminal device accesses a second core network device or is used to indicate that the terminal device establishes dual-flow transmission.

[0284] The terminal device initiates a call service that meets a trigger condition of dual-flow transmission.

[0285] Optionally, the transmission establishing module comprises:

[0286] A first paging message receiving module is configured to receive a first paging message sent by the first core network device; the first paging message carries a first indication, and the first indication is used to indicate that the terminal device accesses a second core network device.

[0287] A first registration module is configured to initiate registration to the second core network device according to the first indication.

[0288] Optionally, the apparatus further comprises:

[0289] A first non-access stratum message receiving module is configured to receive a first non-access stratum message sent by the first core network device; the first non-access stratum message is used to notify the terminal device to initiate a communication connection with the second core network device.

[0290] A second registration module is configured to initiate registration to the second core network device.

[0291] Optionally, the first non-access stratum message carries an identity allocated by the second core network device to the terminal device.

[0292] Optionally, the apparatus further comprises:

[0293] A first service request message sending module is configured to send a first service request message to the first core network device.

[0294] The first service request message carries a second indication, and the second indication is used to indicate whether a serving cell corresponding to the second core network device is found.

[0295] Optionally, the apparatus further comprises:

[0296] An identity obtaining module is configured to obtain at least one of a tracking area identity, a core network identity and a cell identity corresponding to the second core network device in a system message block or a management information base of a second radio access network cell to which the second core network device belongs.

[0297] Optionally, the second indication comprises at least one of a tracking area identity, a core network identity and a cell identity corresponding to the second core network device.

[0298] Optionally, the apparatus further comprises:

[0299] a second service request message sending module, configured to send a second service request message to the second core network device;

[0300] wherein the second service request message carries at least one of the following:

[0301] a first cause value, the first cause value being used to indicate a request cause of establishing dual flow transmission;

[0302] an identity of the terminal device in the first core network device;

[0303] at least one of a tracking area identity, a core network identity and a cell identity corresponding to the first core network device.

[0304] Optionally, the transmission establishing module comprises:

[0305] a first service initiation sub-module, configured to initiate a terminal main call service to the first core network device;

[0306] a registration sub-module, configured to initiate registration to a second core network device in a case that the terminal main call service meets a trigger condition of dual flow transmission.

[0307] Optionally, the trigger condition of dual flow transmission that the terminal main call service meets comprises:

[0308] the terminal device receives a second non-access stratum message sent by the first core network device; the second non-access stratum message is used to indicate that the terminal main call service meets the trigger condition of dual flow transmission.

[0309] Optionally, the registration sub-module comprises:

[0310] a searching sub-unit, configured to search a cell corresponding to the second core network device;

[0311] a registration sub-unit, configured to select a camping cell from the searched candidate cells, and initiate registration to the second core network device in the camping cell.

[0312] Optionally, the registration sub-module comprises:

[0313] a searching unit, configured to search a cell corresponding to the second core network device in a case that the terminal main call service meets the trigger condition of dual flow transmission, and select a cell for camping from the searched candidate cells;

[0314] The second registration unit is configured to initiate registration to the second core network device via a camping cell in a case that the second paging message sent by the second core network device is received.

[0315] Optionally, the first core network device is connected with a first access network device and a second access network device, the first access network device belongs to a first radio access technology, and the second access network device belongs to a second radio access technology.

[0316] The transmission establishment module comprises:

[0317] The transmission establishment sub-module is configured to search for a second cell in a case that the terminal device receives a first message sent by the first core network device in a first cell or in a case that a terminal call service initiated by the terminal device in the first cell to the core network device meets a trigger condition of dual-flow transmission, camp on the searched second cell, and send an access request to a target access network device in the second cell.

[0318] The first cell is a cell of the first radio access technology, the second cell is a cell of the second radio access technology, and the target access network device is the second access network device; or

[0319] The first cell is a cell of the second radio access technology, the second cell is a cell of the first radio access technology, and the target access network device is the first access network device.

[0320] Optionally, the apparatus further comprises:

[0321] The first uplink message sending module is configured to send a first uplink message to an access network device corresponding to the first cell.

[0322] The first uplink message carries at least one of a tracking area identity, a core network identity, and a cell identity of the second cell searched by the terminal device.

[0323] Optionally, the apparatus further comprises:

[0324] The second uplink message sending module is configured to send a second uplink message to the target access network device, and the second uplink message carries at least one of a tracking area identity, a core network identity, and a cell identity of the first cell.

[0325] Optionally, the transmission establishment module comprises:

[0326] The cell measurement sub-module is configured to perform cell measurement on the searched second cell to obtain cell information of the second cell.

[0327] The cell information sending sub-module is configured to send the cell information to an access network device corresponding to the first cell.

[0328] Optionally, the apparatus further includes:

[0329] The third uplink message sending module is configured to send a third uplink message to the first core network device, wherein the third uplink message carries cell information of the second cell.

[0330] Optionally, the second cell searching sub-module includes:

[0331] The second non-access stratum message receiving unit is configured to receive a second non-access stratum message sent by the first core network device, wherein the second non-access stratum message is used to indicate that the terminal device's call service meets a trigger condition of double-flow transmission.

[0332] The second cell searching unit is configured to search for the second cell.

[0333] The registration apparatus in the embodiments of the present application can be an electronic device, for example, an electronic device with an operating system, or a component in an electronic device, for example, an integrated circuit or a chip. The electronic device can be a terminal device. Exemplarily, the terminal device can include, but is not limited to, the types of the terminal device 11 listed above.

[0334] The registration apparatus provided in the embodiments of the present application can implement each process implemented by the method embodiment of FIG. 7 and achieve the same technical effects. To avoid repetition, details are not described herein.

[0335] Referring to FIG. 14, a structural block diagram of a registration apparatus provided in an embodiment of the present application is shown. The apparatus can be applied to a first core network device. As shown in FIG. 14, the apparatus specifically can include:

[0336] The first message sending module 501 is configured to send a first message to a terminal device.

[0337] The first message carries a first indication. The first indication is used to instruct the terminal device to access a second core network device or to establish double-flow transmission.

[0338] Optionally, the first message sending module includes:

[0339] The first paging message sending sub-module is configured to send a first paging message to the terminal device. The first paging message carries a first indication, and the first indication is used to instruct the terminal device to access the second core network device.

[0340] Optionally, the apparatus further includes:

[0341] The first non-access stratum message sending module is configured to send a first non-access stratum message to the terminal device, wherein the first non-access stratum message is used to inform the terminal device to initiate a communication connection with the second core network device.

[0342] Optionally, the first non-access stratum message carries an identity allocated by the second core network device to the terminal device.

[0343] Optionally, the first indication is used to instruct the terminal device to access the second core network device, and the apparatus further comprises:

[0344] The first service request message receiving module is configured to receive a first service request message sent by the terminal device.

[0345] The first service request message carries a second indication, and the second indication is used to indicate whether a serving cell corresponding to the second core network device is found.

[0346] Optionally, the second indication comprises at least one of a tracking area identity, a core network identity and a cell identity corresponding to the second core network device.

[0347] Optionally, the apparatus further comprises:

[0348] The addressing module is configured to address the second core network device through preset information.

[0349] The first core network device sends first information to the second core network device.

[0350] The first information comprises at least one of the following:

[0351] The capability information of the terminal device;

[0352] The context information of the terminal device;

[0353] The service information of the terminal device.

[0354] Optionally, the addressing module comprises:

[0355] The addressing submodule is configured to determine the second core network device corresponding to the second radio access network through a node of the adjacent second radio access network or a tracking area identity of the node of the first radio access network which feeds back a paging response, wherein the first core network device is a device in the first radio access network.

[0356] Optionally, the addressing submodule comprises:

[0357] The first determining unit is configured to determine the second core network device according to a node list of the second radio access network adjacent to the node of the first radio access network, or

[0358] a second determining unit, configured to determine a target tracking area identifier of a second radio access network adjacent to the first radio access network node according to a tracking area mapping table of the first radio access network and the second radio access network, and determine the second core network device according to the target tracking area identifier.

[0359] Optionally, the first core network device is connected with a first access network device and a second access network device, the first access network device belongs to a first radio access mode, and the second access network device belongs to a second radio access mode.

[0360] Optionally, the apparatus further includes:

[0361] a third uplink message receiving module, configured to receive a third uplink message sent by the terminal device; the third uplink message carries cell information of a second cell;

[0362] a communication connection establishing module, configured to establish a communication connection with an access network device corresponding to the second cell according to the cell information;

[0363] The second cell is a cell of the second radio access mode, or the second cell is a cell of the first radio access mode.

[0364] Optionally, the apparatus further includes:

[0365] a service receiving module, configured to receive the terminal call service;

[0366] a second non-access stratum message sending module, configured to send a second non-access stratum message to the terminal device in a case where the terminal call service meets a triggering condition of dual-flow transmission; the second non-access stratum message is used to indicate that the terminal call service meets the triggering condition of dual-flow transmission.

[0367] Optionally, the apparatus further includes:

[0368] a security parameter allocating module, configured to configure security parameters for the first access network device and the second access network device respectively;

[0369] The security parameters include at least one of the following:

[0370] a security algorithm;

[0371] an integrity protection algorithm;

[0372] a key;

[0373] an initial count value.

[0374] The registration apparatus in the embodiments of the present application can be an electronic device, for example, an electronic device with an operating system, or a component in the electronic device, for example, an integrated circuit or a chip. The electronic device can be a network side device. Exemplarily, the network side device can include, but is not limited to, the types of the network side device 12 listed above.

[0375] The registration apparatus provided in the embodiments of the present application can implement each process implemented by the method embodiment of FIG. 8 and achieve the same technical effects. To avoid repetition, details are not described herein.

[0376] Optionally, as shown in FIG. 15, the embodiments of the present application further provide a communication device 900, including a processor 901 and a memory 902, the memory 902 stores programs or instructions executable on the processor 901. For example, when the communication device 900 is a network side device, the programs or instructions are executed by the processor 901 to implement each step of the registration method embodiment of the first aspect described above, and the same technical effects can be achieved. When the communication device 900 is a terminal device, the programs or instructions are executed by the processor 901 to implement each step of the registration method embodiment of the second aspect described above, and the same technical effects can be achieved. To avoid repetition, details are not described herein.

[0377] As shown in FIG. 16, a hardware structure schematic diagram of a terminal device for implementing the embodiments of the present application.

[0378] The terminal device 1000 includes, but is not limited to, at least part of the components such as a radio frequency unit 1001, a network module 1002, an audio output unit 1003, an input unit 1004, a sensor 1005, a display unit 1006, a user input unit 1007, an interface unit 1008, a memory 1009, and a processor 1010.

[0379] Those skilled in the art can understand that the terminal device 1000 can further include a power supply (such as a battery) for supplying power to each component. The power supply can be logically connected to the processor 1010 through a power management system, so as to realize functions such as management of charging, discharging, and power consumption management through the power management system. The terminal device structure shown in FIG. 16 does not constitute a limitation on the terminal device, and the terminal device can include more or fewer components than the illustrated components, or combine certain components, or different component arrangements, which are not described herein.

[0380] It should be understood that in the embodiments of the present application, the input unit 1004 can include a graphics processing unit (GPU) 10041 and a microphone 10042. The graphics processor 10041 processes image data of a still picture or a video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 1006 can include a display panel 10061, which can be configured in the form of a liquid crystal display, an organic light-emitting diode, etc. The user input unit 1007 includes at least one of a touch panel 10071 and other input devices 10072. The touch panel 10071 is also called a touch screen. The touch panel 10071 can include two parts of a touch detection device and a touch controller. The other input devices 10072 can include, but are not limited to, a physical keyboard, function keys (such as volume control keys, on-off keys, etc.), a trackball, a mouse, a joystick, and the like, which will not be described here.

[0381] In the embodiments of the present application, after the radio frequency unit 1001 receives the downlink data from the network side device, it can be transmitted to the processor 1010 for processing. In addition, the radio frequency unit 1001 can send uplink data to the network side device. Generally, the radio frequency unit 1001 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0382] The memory 1009 can be used to store software programs or instructions and various data. The memory 1009 can mainly include a first storage area storing programs or instructions and a second storage area storing data, wherein the first storage area can store an operating system, at least one application program required by a function (such as a sound playing function, an image playing function, etc.), and the like. In addition, the memory 1009 can include a volatile memory or a non-volatile memory, or the memory 1009 can include both volatile and non-volatile memories. The non-volatile memory can be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically EPROM (EEPROM), or a flash memory. The volatile memory can be a Random Access Memory (RAM), a Static RAM (SRAM), a Dynamic RAM (DRAM), a Synchronous DRAM (SDRAM), a Double Data Rate SDRAM (DDR SDRAM), an Enhanced SDRAM (ESDRAM), a Synch link DRAM (SLDRAM), and a Direct Rambus RAM (DRRAM). The memory 1009 in the embodiments of the present application includes but is not limited to these and any other suitable types of memories.

[0383] The processor 1010 can include one or more processing units; optionally, the processor 1010 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and an application program, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 1010.

[0384] The processor 1010 is configured to establish a dual-stream transmission when a first condition is met.

[0385] The first condition includes at least one of the following:

[0386] The terminal device receives a first message sent by the first core network device, and the first message carries a first indication; the first indication is used to indicate that the terminal device accesses a second core network device or is used to indicate that the terminal device establishes dual-flow transmission.

[0387] The terminal device initiates a terminal call service that meets a trigger condition of dual-flow transmission.

[0388] Optionally, the radio frequency unit 1001 is configured to receive a first paging message sent by the first core network device; the first paging message carries a first indication, and the first indication is used to indicate that the terminal device accesses a second core network device.

[0389] The processor 1010 is configured to initiate registration with the second core network device according to the first indication.

[0390] Optionally, the radio frequency unit 1001 is configured to receive a first non-access stratum message sent by the first core network device; the first non-access stratum message is used to notify the terminal device to initiate a communication connection with the second core network device.

[0391] The processor 1010 is configured to initiate registration with the second core network device.

[0392] Optionally, the first non-access stratum message carries an identity allocated to the terminal device by the second core network device.

[0393] Optionally, the radio frequency unit 1001 is configured to send a first service request message to the first core network device.

[0394] The first service request message carries a second indication, and the second indication is used to indicate whether a serving cell corresponding to the second core network device is found.

[0395] Optionally, the processor 1010 is configured to obtain at least one of a tracking area identity, a core network identity, and a cell identity corresponding to the second core network device in a system message block or a management information base of a second radio access network cell to which the second core network device belongs.

[0396] Optionally, the second indication includes at least one of a tracking area identity, a core network identity, and a cell identity corresponding to the second core network device.

[0397] Optionally, the radio frequency unit 1001 is configured to send a second service request message to the second core network device.

[0398] The second service request message carries at least one of the following:

[0399] a first cause value, the first cause value being used to indicate a request cause of establishing a dual-stream transmission;

[0400] an identity of the terminal device in the first core network device;

[0401] at least one of a tracking area identity, a core network identity and a cell identity corresponding to the first core network device.

[0402] Optionally, the processor 1010 is specifically configured to:

[0403] initiate a terminal originating call service to the first core network device;

[0404] initiate registration to a second core network device in a case where the terminal originating call service meets a trigger condition of dual-stream transmission.

[0405] Optionally, the terminal originating call service meeting the trigger condition of dual-stream transmission comprises:

[0406] the terminal device receiving a second non-access stratum message sent by the first core network device, the second non-access stratum message being used to indicate that the terminal originating call service meets the trigger condition of dual-stream transmission.

[0407] Optionally, the processor 1010 is specifically configured to:

[0408] search for a cell corresponding to the second core network device;

[0409] select a camping cell from the searched candidate cells and initiate registration to the second core network device in the camping cell.

[0410] Optionally, the processor 1010 is specifically configured to:

[0411] in a case where the terminal originating call service meets the trigger condition of dual-stream transmission, search for a cell corresponding to the second core network device and select a cell for camping from the searched candidate cells;

[0412] initiate registration to the second core network device in the camping cell in a case where a second paging message sent by the second core network device is received.

[0413] Optionally, the first core network device is connected with a first access network device and a second access network device, the first access network device belongs to a first radio access technology and the second access network device belongs to a second radio access technology;

[0414] The processor 1010 is configured to: in a case where the terminal device receives a first message sent by the first core network device in a first cell, or in a case where terminal device-initiated call service initiated by the terminal device in the first cell satisfies a trigger condition of dual-stream transmission, search for a second cell, camp on the searched second cell, and send an access request to a target access network device in the second cell.

[0415] The first cell is a cell of the first radio access technology, the second cell is a cell of the second radio access technology, and the target access network device is the second access network device.

[0416] The first cell is a cell of the second radio access technology, the second cell is a cell of the first radio access technology, and the target access network device is the first access network device.

[0417] Optionally, the radio frequency unit 1001 is configured to send a first uplink message to an access network device corresponding to the first cell.

[0418] The first uplink message carries at least one of a tracking area identity, a core network identity, and a cell identity of the second cell searched by the terminal device.

[0419] Optionally, the radio frequency unit 1001 is configured to send a second uplink message to the target access network device, and the second uplink message carries at least one of a tracking area identity, a core network identity, and a cell identity of the first cell.

[0420] Optionally, the radio frequency unit 1001 is configured to:

[0421] perform cell measurement on the searched second cell to obtain cell information of the second cell.

[0422] send the cell information to an access network device corresponding to the first cell.

[0423] Optionally, the radio frequency unit 1001 is configured to send a third uplink message to the first core network device, and the third uplink message carries the cell information of the second cell.

[0424] Optionally, the radio frequency unit 1001 is configured to receive a second non-access stratum message sent by the first core network device, the second non-access stratum message is used to indicate that the terminal device-initiated call service satisfies the trigger condition of dual-stream transmission, and search for the second cell.

[0425] The embodiment of the present application also provides a network side device, comprising a processor and a communication interface, the communication interface is coupled with the processor, and the processor is used for running programs or instructions to realize the steps of the method embodiment shown in Fig. 8. The network side device embodiment corresponds to the network side device method embodiment described above, and each implementation process and implementation manner of the method embodiment can be applied to the network side device embodiment and can achieve the same technical effects.

[0426] Specifically, the embodiment of the present application also provides a network side device, as shown in Fig. 17, the network side device 1100 comprises: an antenna 111, a radio frequency device 112, a baseband device 113, a processor 114 and a memory 115. The antenna 111 is connected with the radio frequency device 112. In the uplink direction, the radio frequency device 112 receives information through the antenna 111, and sends the received information to the baseband device 113 for processing. In the downlink direction, the baseband device 113 processes the information to be sent and sends it to the radio frequency device 112, and the radio frequency device 112 processes the received information and sends it out through the antenna 111.

[0427] The method performed by the network side device in the above embodiment can be implemented in the baseband device 113, and the baseband device 113 comprises a baseband processor.

[0428] The baseband device 113 may, for example, comprise at least one baseband board, and a plurality of chips are arranged on the baseband board, as shown in Fig. 17, one of the chips is a baseband processor, for example, which is connected with the memory 115 through a bus interface to call programs in the memory 115 and execute the network device operations shown in the above method embodiment.

[0429] The network side device may also comprise a network interface 116, which is a common public radio interface (CPRI), for example.

[0430] Specifically, the network side device 1100 of the embodiment of the present application further comprises instructions or programs stored in the memory 115 and executable on the processor 114, and the processor 114 calls the instructions or programs in the memory 115 to execute the method performed by each module shown in Fig. 14 and achieve the same technical effects. To avoid repetition, details are not described here.

[0431] The embodiment of the present application also provides a network side device. As shown in Fig. 18, the network side device 1200 comprises a processor 1201, a network interface 1202 and a memory 1203. The network interface 1202 is a common public radio interface (CPRI), for example.

[0432] Specifically, the network side device 1200 of the embodiment of the present application further comprises instructions or programs stored on the storage 1203 and executable on the processor 1201, the processor 1201 invokes the instructions or programs in the storage 1203 to execute the method performed by each module shown in FIG. 14 and achieve the same technical effects, and thus the details are not described herein again.

[0433] The embodiment of the present application further provides a readable storage medium, the readable storage medium stores programs or instructions, the programs or instructions are executed by a processor to implement each process of the above-mentioned registration method embodiment, and the same technical effects can be achieved, and thus the details are not described herein again.

[0434] The processor is the processor in the terminal device in the above-mentioned embodiments. The readable storage medium includes a computer readable storage medium, such as a computer readable only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0435] The embodiment of the present application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled with the processor, and the processor is used to run programs or instructions to implement each process of the above-mentioned registration method embodiment and achieve the same technical effects, and thus the details are not described herein again.

[0436] It should be understood that the chip mentioned in the embodiment of the present application can also be referred to as a system chip, a system chip, a chip system or a system on chip, etc.

[0437] The embodiment of the present application further provides a computer program / program product, the computer program / program product is stored in a storage medium, and the computer program / program product is executed by at least one processor to implement each process of the above-mentioned registration method embodiment and achieve the same technical effects, and thus the details are not described herein again.

[0438] The embodiment of the present application further provides a registration system, including a terminal device and a network side device, the terminal device can be used to execute the steps of the registration method according to the second aspect, and the network side device can be used to execute the steps of the registration method according to the first aspect.

[0439] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it is to be understood that the method and apparatus of the present application can be carried out by more than one process, method, article, or apparatus either simultaneously, concurrently, or with intervening action that are carried out at the same time, in any order, or in an overlapping manner. Also, it is to be understood that the order of steps or order for executing the processes or methods having described herein is not an essential part of the application. Rather, the applications can be implemented by other process sequence or order, or combinations thereof. Further, the features described in relation to one example can be combined in other examples.

[0440] From the above description of the embodiments, it is manifest that the above-described methods can be realized by means of software and general purpose hardware platforms, but of course can also be realized by hardware. Based on such an understanding, the technical solutions of the present application can be embodied in the form of a computer software product, which is stored in a storage medium (such as a ROM / RAM, a magnetic disk, or an optical disk) and includes a plurality of instructions to cause a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the methods described in the various embodiments of the present application.

[0441] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are merely illustrative rather than limiting, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope of protection of the claims, and all the forms shall fall within the scope of protection of the present application.

Claims

1. A registration method, wherein, The method comprises: The terminal device establishes dual-flow transmission under the condition that a first condition is met; The first condition comprises at least one of the following: The terminal device receives a first message sent by the first core network device, and the first message carries a first indication; the first indication is used to instruct the terminal device to access a second core network device or to establish dual-flow transmission; Terminal device in the terminal device, the main call service meets the trigger condition of dual-flow transmission.

2. The method of claim 1, wherein, The terminal device establishes dual-flow transmission under the condition that a first condition is met, comprising: The terminal device receives a first paging message sent by the first core network device; the first paging message carries a first indication, and the first indication is used to instruct the terminal device to access a second core network device; The terminal device initiates registration to the second core network device according to the first indication.

3. The method of claim 2, wherein, The method further comprises: The terminal device receives a first non-access layer message sent by the first core network device; the first non-access layer message is used to instruct the terminal device to initiate a communication connection with the second core network device; The terminal device initiates registration to the second core network device.

4. The method of claim 3, wherein, The first non-access layer message carries an identity allocated by the second core network device for the terminal device.

5. The method of claim 2, wherein, The method further comprises: The terminal device sends a first service request message to the first core network device; The first service request message carries a second indication, and the second indication is used to indicate whether a serving cell corresponding to the second core network device is found.

6. The method of claim 5, wherein, Before the terminal device sends the first service request message to the first core network device, the method further comprises: The terminal device acquires at least one of a tracking area identity, a core network identity and a cell identity corresponding to the second core network device in a system message block or a management information base of a second radio access network cell to which the second core network device belongs.

7. The method of claim 5, wherein, The second indication comprises at least one of a tracking area identity, a core network identity and a cell identity corresponding to the second core network device.

8. The method of claim 2, wherein, The method further comprises: The terminal device sends a second service request message to the second core network device; The second service request message carries at least one of the following: A first reason value, which is used to indicate that the request reason is to establish dual-flow transmission; An identity of the terminal device in the first core network device; At least one of a tracking area identity, a core network identity and a cell identity corresponding to the first core network device.

9. The method of claim 1, wherein, The terminal device establishes dual-flow transmission under the condition that a first condition is met, comprising: The terminal device initiates a terminal main call service to the first core network device; The terminal device initiates registration to a second core network device under the condition that the terminal main call service meets a trigger condition of dual-flow transmission.

10. The method of claim 9, wherein, The terminal main call service meets the trigger condition of dual-flow transmission, comprising: The terminal device receives a second non-access layer message sent by the first core network device; the second non-access layer message is used to indicate that the terminal main call service meets the trigger condition of dual-flow transmission.

11. The method of claim 9, wherein, The initiating the registration with the second core network device comprises: The terminal device searches for a cell corresponding to the second core network device; The terminal device selects a camping cell from the searched candidate cells and initiates the registration with the second core network device in the camping cell.

12. The method of claim 9, wherein, The terminal device initiates the registration with the second core network device in a case that the terminal originating service meets a triggering condition of the dual-stream transmission. The terminal device searches for a cell corresponding to the second core network device in a case that the terminal originating service meets a triggering condition of the dual-stream transmission. The terminal device initiates the registration with the second core network device in the camping cell in a case that the terminal device receives a second paging message sent by the second core network device.

13. The method of claim 1, wherein, The first core network device is connected with a first access network device and a second access network device, the first access network device belongs to a first radio access technology, and the second access network device belongs to a second radio access technology. The terminal device establishes the dual-stream transmission in a case that a first condition is met. The terminal device searches for a second cell in a case that the terminal device receives a first message sent by the first core network device in a first cell or in a case that a terminal originating service initiated by the terminal device in the first cell meets a triggering condition of the dual-stream transmission, and camps on the searched second cell and sends an access request to a target access network device in the second cell. The first cell is a cell of the first radio access technology, the second cell is a cell of the second radio access technology, and the target access network device is the second access network device; or The first cell is a cell of the second radio access technology, the second cell is a cell of the first radio access technology, and the target access network device is the first access network device.

14. The method of claim 13, wherein, The method further comprises: The terminal device sends a first uplink message to an access network device corresponding to the first cell. The first uplink message carries at least one of a tracking area identity, a core network identity and a cell identity of the searched second cell.

15. The method of claim 13, wherein, The method further comprises: The terminal device sends a second uplink message to the target access network device; the second uplink message carries at least one of a tracking area identity, a core network identity and a cell identity of the first cell.

16. The method of claim 13, wherein, The method further comprises: The terminal device performs cell measurement on the searched second cell to obtain cell information of the second cell. The terminal device sends the cell information to an access network device corresponding to the first cell.

17. The method of claim 16, wherein, The method further comprises: The terminal device sends a third uplink message to the first core network device; the third uplink message carries the cell information of the second cell.

18. The method of claim 16, wherein, The terminal device searches for the second cell in a case that the terminal originating service meets a triggering condition of the dual-stream transmission. The terminal device receives a second non-access stratum message sent by the first core network device; the second non-access stratum message is used for indicating that the terminal device initiates a call service that meets a trigger condition of dual-flow transmission; The terminal device searches for the second cell.

19. A registration method, wherein, The method comprises: The first core network device sends a first message to a terminal device; The first message carries a first indication; the first indication is used for indicating that the terminal device accesses a second core network device or is used for indicating that the terminal device establishes dual-flow transmission.

20. The method of claim 19, wherein, The first core network device sends a first message to a terminal device, comprising: The first core network device sends a first paging message to the terminal device; the first paging message carries a first indication, and the first indication is used for indicating that the terminal device accesses a second core network device.

21. The method of claim 19, wherein, The method further comprises: The first core network device sends a first non-access stratum message to the terminal device; the first non-access stratum message is used for notifying the terminal device to initiate a communication connection with the second core network device.

22. The method of claim 21, wherein, The first non-access stratum message carries an identity allocated by the second core network device for the terminal device.

23. The method of claim 19, wherein, The first indication is used for indicating that the terminal device accesses a second core network device; the method further comprises: The first core network device receives a first service request message sent by the terminal device; The first service request message carries a second indication, and the second indication is used for indicating whether a service cell corresponding to the second core network device is found.

24. The method of claim 23, wherein, The second indication comprises at least one of a tracking area identity, a core network identity and a cell identity corresponding to the second core network device.

25. The method of claim 19, wherein, The method further comprises: The first core network device addresses a second core network device through preset information; The first core network device sends first information to the second core network device; The first information comprises at least one of the following: Capability information of the terminal device; Context information of the terminal device; Service information of the terminal device.

26. The method of claim 25, wherein, The first core network device addresses a second core network device through preset information, comprising: The first core network device determines a second core network device corresponding to a second radio access network through a node of the second radio access network corresponding to a node of a first radio access network that feeds back a paging response or a tracking area identity; the first core network device is a device in the first radio access network.

27. The method of claim 26, wherein, The first core network device determines a second core network device corresponding to a second radio access network through a node of the second radio access network corresponding to a node of a first radio access network that feeds back a paging response or a tracking area identity, comprising: The first core network device determines the second core network device according to a node list of the second radio access network adjacent to the node of the first radio access network; or The first core network device determines a target tracking area identity of the second radio access network adjacent to the node of the first radio access network according to a tracking area mapping table of the first radio access network and the second radio access network, and determines the second core network device according to the target tracking area identity.

28. The method of claim 19, wherein, The first core network device is connected with a first access network device and a second access network device, the first access network device belongs to a first wireless access mode, and the second access network device belongs to a second wireless access mode.

29. The method of claim 28, wherein, The method further includes: The first core network device receives a third uplink message sent by the terminal device; the third uplink message carries cell information of a second cell; The first core network device establishes a communication connection with an access network device corresponding to the second cell according to the cell information; The second cell is a cell of the second wireless access mode, or the second cell is a cell of the first wireless access mode.

30. The method of claim 19 or 28, wherein, The method further includes: The first core network device receives a terminal call service; The first core network device sends a second non-access layer message to the terminal device in a case where the terminal call service meets a triggering condition of dual-stream transmission; the second non-access layer message is used to indicate that the terminal call service meets the triggering condition of dual-stream transmission.

31. The method of claim 28, wherein, The method further includes: The first core network device configures security parameters for the first access network device and the second access network device respectively; The security parameters include at least one of the following: a security algorithm; an integrity protection algorithm; a key; an initial count value.

32. A registration device, wherein, The apparatus applied to a terminal device includes: A transmission establishment module, configured to establish dual-stream transmission in a case where a first condition is met; The first condition includes at least one of the following: The terminal device receives a first message sent by the first core network device, and the first message carries a first indication; the first indication is used to indicate that the terminal device accesses a second core network device, or is used to indicate that the terminal device establishes dual-stream transmission; A terminal call service in the terminal device meets a triggering condition of dual-stream transmission.

33. A registration device, wherein, The apparatus applied to a first core network device includes: A first message sending module, configured to send a first message to a terminal device; The first message carries a first indication; the first indication is used to indicate that the terminal device accesses a second core network device, or is used to indicate that the terminal device establishes dual-stream transmission.

34. A terminal device, wherein, The apparatus includes a processor and a memory, the memory stores programs or instructions executable on the processor, and the programs or instructions are executed by the processor to implement the steps of the registration method in any one of claims 1 to 18.

35. A network-side device, wherein, The apparatus includes a processor and a memory, the memory stores programs or instructions executable on the processor, and the programs or instructions are executed by the processor to implement the steps of the registration method in any one of claims 19 to 31.

36. A readable storage medium, wherein, The readable storage medium stores programs or instructions, and the programs or instructions are executed by the processor to implement the registration method in any one of claims 1 to 18, or implement the steps of the registration method in any one of claims 19 to 31.

37. A chip, wherein, The chip comprises a processor and a communication interface, the communication interface and the processor are coupled, the processor is used to run a program or an instruction, and the registration method as claimed in any one of claims 1 to 18 is realized, or the steps of the registration method as claimed in any one of claims 19 to 31 are realized.

38. A computer program product, wherein, The program product is stored in a non-volatile storage medium, and the program product is executed by at least one processor to realize the registration method as claimed in any one of claims 1 to 18, or realize the steps of the registration method as claimed in any one of claims 19 to 31.

39. An electronic device, comprising: The device is configured to execute the registration method as claimed in any one of claims 1 to 18, or realize the registration method as claimed in any one of claims 19 to 31.

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