Handover method and device

Abstract

The present application relates to a handover method and a device. The handover method comprises: a terminal device sends a first message to an access node, the first message being used by the access node to determine a target access node from an access network corresponding to an allowed radio access technology (RAT). The present application can solve a handover problem in a multi-access scenario.

Description

Handover method and device TECHNICAL FIELD

[0001] The present application relates to the field of communication, and more particularly, to a handover method and device. BACKGROUND

[0002] In the current handover mechanism, for a multi-access scenario, the source access node does not know that the radio access technology (RAT) needs to be kept unchanged, and it is possible to select a target access network (AN) different from the current RAT due to the measurement signal, resulting in a change of the RAT of the UE, and thus losing the gain of multi-access. It can be seen that how to perform handover in a multi-access scenario is a technical problem to be solved.

[0003] SUMMARY

[0004] Embodiments of the present application provide a handover method and device.

[0005] Embodiments of the present application provide a handover method, comprising:

[0006] The terminal device sends a first message to the access node, and the first message is used for the access node to determine a target access node from an access network corresponding to an allowed radio access technology (RAT).

[0007] Embodiments of the present application provide a handover method, comprising:

[0008] The access node receives a first message sent by a terminal device;

[0009] The access node determines a target access node from an access network corresponding to an allowed radio access technology (RAT) according to the first message.

[0010] Embodiments of the present application provide a handover method, comprising:

[0011] The first network element sends first indication information to the access node, and the first indication information is used to indicate at least one of the following:

[0012] The terminal device is in a multi-access service;

[0013] The RAT is not changed during handover;

[0014] The allowed RAT.

[0015] Embodiments of the present application provide a terminal device, comprising:

[0016] The first transceiver module is configured to send a first message to the access node, and the first message is used for the access node to determine a target access node from an access network corresponding to an allowed radio access technology (RAT).

[0017] Embodiments of the present application provide an access node, comprising:

[0018] a second transceiver module, configured to receive the first message sent by the terminal device;

[0019] a first processing module, configured to determine a target access node from the access network corresponding to the allowed RAT according to the first message.

[0020] Embodiments of the present application provide a first network element, comprising:

[0021] a third transceiver module, configured to send first indication information to the access node, the first indication information being used to indicate at least one of the following:

[0022] the terminal device is in multi-access service;

[0023] the RAT is not changed during the handover;

[0024] the allowed RAT.

[0025] Embodiments of the present application provide a terminal device, comprising a transceiver, a processor and a memory. The memory is used to store a computer program, the transceiver is used to communicate with other devices, and the processor is used to call and run the computer program stored in the memory, so that the terminal device executes the handover method described above.

[0026] Embodiments of the present application provide a network device, comprising a transceiver, a processor and a memory. The memory is used to store a computer program, the transceiver is used to communicate with other devices, and the processor is used to call and run the computer program stored in the memory, so that the network device executes the handover method described above.

[0027] Embodiments of the present application provide a chip, used to implement the handover method described above.

[0028] Specifically, the chip comprises a processor, used to call and run a computer program from a memory, so that the device installed with the chip executes the handover method described above.

[0029] Embodiments of the present application provide a computer readable storage medium, used to store a computer program, which makes the device execute the handover method described above when the computer program is run by the device.

[0030] Embodiments of the present application provide a computer program product, comprising computer program instructions, which make a computer execute the handover method described above.

[0031] Embodiments of the present application provide a computer program, which makes a computer execute the handover method described above when it is run on the computer.

[0032] In the embodiments of the present application, the terminal device sends a first message to the access node, and the first message is used for the access node to determine a target access node from the access networks corresponding to the allowed RATs, so that the change of the RAT in the handover process is avoided in the multi-access scenario. BRIEF DESCRIPTION OF DRAWINGS

[0033] FIG. 1 illustrates a communication system 100.

[0034] FIG. 2 is a schematic diagram of a 5G network architecture.

[0035] FIG. 3A is a schematic diagram of a multi-access network.

[0036] FIG. 3B is a schematic diagram of a multi-access network.

[0037] FIG. 4 is a schematic diagram of a handover mechanism.

[0038] FIG. 5 is a schematic flowchart of a handover method 500 according to an embodiment of the present application.

[0039] FIG. 6 is a schematic flowchart of a handover method 600 according to an embodiment of the present application.

[0040] FIG. 7 is a schematic flowchart of a handover method 700 according to an embodiment of the present application.

[0041] FIG. 8 is an implementation flowchart according to an embodiment of the present application.

[0042] FIG. 9 is an implementation flowchart according to another embodiment of the present application.

[0043] FIG. 10 is an implementation flowchart according to a third embodiment of the present application.

[0044] FIG. 11 is a schematic block diagram of a terminal device 1100 according to an embodiment of the present application.

[0045] FIG. 12 is a schematic block diagram of an access node 1200 according to an embodiment of the present application.

[0046] FIG. 13 is a schematic block diagram of a first network element 1300 according to an embodiment of the present application.

[0047] FIG. 14 is a schematic block diagram of a communication device 1400 according to an embodiment of the present application.

[0048] FIG. 15 is a schematic block diagram of a chip 1500 according to an embodiment of the present application. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

[0050] The technical solutions of the embodiments of the present application can be applied to various communication systems, for example, a Long Term Evolution (LTE) system, an Advanced long term evolution (LTE-A) system, a New Radio (NR) system, an evolved system of the NR system, an LTE-based access to unlicensed spectrum (LTE-U) system, an NR-based access to unlicensed spectrum (NR-U) system, a Non-Terrestrial Networks (NTN) system, a Universal Mobile Telecommunication System (UMTS), a Wireless Local Area Networks (WLAN), a Wireless Fidelity (WiFi), a 5th-Generation (5G) system, or other communication systems.

[0051] Generally, a conventional communication system supports a limited number of connections and is easy to implement. However, with the development of communication technology, a mobile communication system will not only support conventional communication, but also support, for example, Device to Device (D2D) communication, Machine to Machine (M2M) communication, Machine Type Communication (MTC), Vehicle to Vehicle (V2V) communication, or Vehicle to everything (V2X) communication. The embodiments of the present application can also be applied to these communication systems.

[0052] In an embodiment, the communication system in the embodiments of the present application can be applied to a Carrier Aggregation (CA) scenario, can also be applied to a Dual Connectivity (DC) scenario, and can also be applied to a Standalone (SA) network deployment scenario.

[0053] In an embodiment, the communication system in the embodiments of the present application can be applied to unlicensed spectrum, where the unlicensed spectrum can also be considered as shared spectrum; or the communication system in the embodiments of the present application can also be applied to licensed spectrum, where the licensed spectrum can also be considered as non-shared spectrum.

[0054] Embodiments of the present application describe various embodiments in connection with network devices and terminal devices, wherein the terminal device can also be referred to as a user equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device, etc.

[0055] The terminal device can be a station (STA) in a WLAN, and can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA) device, a handheld device having wireless communication function, a computing device, or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a next-generation communication system such as an NR network, or a terminal device in a future evolved Public Land Mobile Network (PLMN) network, etc.

[0056] In embodiments of the present application, the terminal device can be deployed on land, including indoors or outdoors, handheld, wearable, or in-vehicle; can also be deployed on water (such as a ship, etc.); and can also be deployed in the air (such as on an airplane, a balloon, and a satellite, etc.).

[0057] In embodiments of the present application, the terminal device can be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self driving, a wireless terminal device in remote medical treatment, a wireless terminal device in smart grid, a wireless terminal device in transportation safety, a wireless terminal device in smart city, or a wireless terminal device in smart home, etc.

[0058] As an example but not limitation, in embodiments of the present application, the terminal device can also be a wearable device. The wearable device can also be referred to as a wearable smart device, which is a general term for devices that are designed and developed by applying wearable technology to daily wear, such as glasses, gloves, watches, clothing, and shoes. The wearable device is a portable device that can be directly worn on the body or integrated into the user's clothes or accessories. The wearable device is not only a hardware device, but also a powerful function achieved through software support and data interaction, cloud interaction. The broad sense of wearable smart devices includes devices with full functions, large sizes, and the ability to realize complete or partial functions without relying on smart phones, such as smart watches or smart glasses, and devices that focus on a certain application function and need to be used with other devices such as smart phones, such as various smart wristbands, smart jewelry, and other devices for monitoring vital signs.

[0059] In embodiments of the present application, the network device can be a device for communicating with the mobile device, and the network device can be an access point (Access Point, AP) in a WLAN, an evolved node B (Evolutional Node B, eNB or eNodeB) in LTE, or a relay station or an access point, or a vehicle-mounted device, a wearable device, and a network device in an NR network (gNB) or a future evolved PLMN network or a network device in an NTN network, etc.

[0060] As an example but not limitation, in embodiments of the present application, the network device can have mobile characteristics, for example, the network device can be a mobile device. Alternatively, the network device can be a satellite, a balloon station. For example, the satellite can be a low earth orbit (low earth orbit, LEO) satellite, a medium earth orbit (medium earth orbit, MEO) satellite, a geostationary earth orbit (geostationary earth orbit, GEO) satellite, a high elliptical orbit (High Elliptical Orbit, HEO) satellite, etc. Alternatively, the network device can also be a base station arranged at a position on land, water, etc.

[0061] In the embodiments of the present application, the network device can serve a cell, and a terminal device communicates with the network device through a transmission resource (for example, a frequency domain resource, or a spectrum resource) used by the cell. The cell can be a cell corresponding to the network device (for example, a base station), and the cell can belong to a macro base station or a base station corresponding to a small cell (Small cell). The small cell can include a metro cell, a micro cell, a pico cell, a femto cell, and the like. The small cell has the characteristics of small coverage and low transmit power, and is suitable for providing high-speed data transmission services.

[0062] FIG. 1 illustrates a communication system 100. The communication system includes one network device 110 and two terminal devices 120. In an embodiment, the communication system 100 can include multiple network devices 110, and each network device 110 can include other numbers of terminal devices 120 within its coverage, which is not limited in the embodiments of the present application.

[0063] In an embodiment, the communication system 100 can further include a mobility management entity (MME), an access and mobility management function (AMF), and other network entities, which are not limited in the embodiments of the present application.

[0064] The network device can include an access network device and a core network device. That is, the wireless communication system further includes multiple core networks for communicating with the access network device. The access network device can be an evolved node B (eNB or e-NodeB) macro base station, a micro base station (also referred to as a “small base station”), a pico base station, an access point (AP), a transmission point (TP), or a new generation Node B (gNodeB) in a long-term evolution (LTE) system, a next radio (NR) system, or an authorized auxiliary access long-term evolution (LAA-LTE) system.

[0065] It should be understood that the devices with communication function in the network / system in the embodiments of the present application can be referred to as communication devices. For example, the communication system shown in FIG. 1, the communication devices can include network devices and terminal devices with communication function, which can be specific devices in the embodiments of the present application, and will not be described here. The communication devices can also include other devices in the communication system, such as network controllers, mobile management entities and other network entities, which are not limited in the embodiments of the present application.

[0066] It should be understood that the terms "system" and "network" are often used interchangeably in this paper. The term "and / or" in this paper is only used to describe the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " generally represents an "or" relationship between the associated objects before and after it.

[0067] It should be understood that the "indication" mentioned in the embodiments of the present application can be direct indication, indirect indication, or can represent an associated relationship. For example, A indicates B, which can mean that B can be obtained through A, or A indirectly indicates B, for example, A indicates C, and B can be obtained through C, or A and B have an associated relationship.

[0068] In the description of the embodiments of the present application, the term "corresponding" can represent a direct or indirect corresponding relationship between the two, or an associated relationship between the two, or an indication and being indicated, configuration and being configured, etc.

[0069] In order to facilitate the understanding of the technical solutions of the embodiments of the present application, the related technologies of the embodiments of the present application are described as follows, which can be combined with the technical solutions of the embodiments of the present application in any way as optional schemes, and all belong to the protection scope of the embodiments of the present application.

[0070] Figure 2 is a schematic diagram of a 5G architecture. In the figure, a UE accesses an access network (AN) through a Uu interface to perform access layer connection and exchange access layer messages and wireless data transmission. The UE accesses an access and mobility management function (AMF) through an N1 interface to perform non-access stratum (NAS) connection and exchange NAS messages. The AMF is a mobility management function in a core network, and the SMF is a session management function in the core network. The AMF is responsible for forwarding session management related messages between the UE and the SMF in addition to mobility management of the UE. The PCF is a policy management function in the core network, and is responsible for formulating policies related to mobility management, session management, charging, and the like of the UE. The UPF is a user plane function in the core network, and performs data transmission with an external data network through an N6 interface and data transmission with the AN through an N3 interface.

[0071] Currently, in order to fully utilize the network resources and spectrum of multiple access networks, multiple 3GPP access networks (such as 4G networks, 5G networks, 6G networks, NTN networks, non-3GPP networks, and the like) cooperate to achieve flexible offloading and switching of data traffic between two or more access networks, and multiple access technologies are introduced. The anchor point of the data traffic is in the core network, and there is no requirement for direct connection or data transmission between access nodes of different ANs. Specifically, two possible architectures of multiple access services are shown in Figures 3A and 3B.

[0072] The scenario shown in Figure 3A is that a multiple access node (which can be a UE, a terminal device, or other multiple access nodes) simultaneously accesses different radio access technology (RAT) access networks, but different RATs access the same core network. As shown in Figure 3A, the multiple access node is connected to an access node of AN1 and accesses the core network through the access node of AN1. At the same time, the multiple access node is connected to an access node of AN2 and accesses the core network through the access node of AN2. In addition, the access node of AN1 and the access node of AN2 do not require direct connection or data transmission.

[0073] The scenario shown in FIG. 3B is that the multi-access node (possibly a UE, terminal device or other multi-access node) simultaneously accesses different RAT access networks, and different RATs access different core networks. As shown in FIG. 3B, the multi-access node is connected with the access node of AN1 and accesses the core network 1 through the access node of AN1; at the same time, the multi-access node is connected with the access node of AN2 and accesses the core network 2 through the access node of AN2; and / or, the access node of AN1 and the access node of AN2 do not require direct connection or data transmission.

[0074] In order to ensure the multi-access gain of the same device, it is necessary to keep the RAT unchanged, avoid changing the RAT due to switching, and thus affect the multi-access service. For example, a device (Device) simultaneously accesses two access networks, including AN1 and AN2; the multi-access technology used by AN1 is RAT1, and the multi-access technology used by AN2 is RAT2; when the device sends measurement information to the access node corresponding to AN1, it is necessary to ensure that the access node corresponding to AN1 switches the access of the device to the access node corresponding to the access network using RAT1, that is, to ensure that the RAT is unchanged.

[0075] The existing switching mechanism is shown in FIG. 4, and the main switching steps include:

[0076] Step 0: The AMF configures the mobile control information to the source access node (Source gNB), which may include, for example, roaming information and access restriction information; the access restriction information may include, for example, prohibited RAT information, prohibited area information, service area restriction information, etc.

[0077] Step 1: The Source gNB configures the measurement reporting control information of the UE, which may include, for example, the excluded cell list or the allowed cell list, and may also include the center frequency information of the neighboring cells, etc. The UE reports the measurement information to the Source gNB according to the measurement reporting control information of the Source gNB, which may include, for example, the power information of the measured cells, the corresponding measurement configuration ID, etc.

[0078] Step 2: The Source gNB decides to switch according to the measurement result reported by the UE, and determines the target access node (Target gNB).

[0079] Step 3: The Source gNB sends the switching request information to the Target gNB, which may include, for example, the target cell ID information, etc.

[0080] Step 4: The Target gNB receives the switching request and performs admission control, which mainly includes which sessions can be switched, etc.

[0081] Step 5: Target gNB feeds back the handover response information to Source gNB.

[0082] Step 6: Subsequent handover procedure.

[0083] It can be seen that the selection of the Target gNB and the selection of the Target Cell are both determined by the Source gNB according to the measurement information reported by the UE. The measurement information reported by the UE is measured according to the configuration of the Source gNB, and further, the measurement control information is determined by the Source gNB according to some limit information configured by the AMF.

[0084] In the current handover mechanism, the source access node does not know that the RAT needs to be kept unchanged, and it is possible to select a target AN different from the current RAT due to the measurement signal, resulting in the change of the RAT of the UE, and further, the loss of the gain of multi-access.

[0085] Since the current handover mechanism does not make corresponding optimization adjustment for the multi-access scenario, if the existing handover mechanism is reused, the RAT may change after the handover, resulting in the loss of the gain of multi-access.

[0086] Embodiments of the present application propose a handover method, which is applicable to a multi-access scenario and can avoid the above problems.

[0087] FIG. 5 is a schematic flowchart of a handover method 500 according to an embodiment of the present application. The method can be applied to any of the systems shown in FIGS. 1 to 4, but is not limited thereto. The method includes at least part of the following content.

[0088] S510, the terminal device sends a first message to an access node, the first message being used for the access node to determine a target access node from an access network corresponding to an allowed RAT.

[0089] In some embodiments, the terminal device can be a multi-access node containing a plurality of terminal devices, or a terminal device containing a plurality of Subscriber Identification Modules (SIMs) or network cards, or a single terminal device.

[0090] The terminal device is in a multi-access service when sending the first message to the access node. In an example, the multi-access service includes that the terminal device simultaneously accesses at least two access networks, and different access networks correspond to different RATs.

[0091] In some embodiments, before the terminal device sends the first message to the access node, the method further includes at least one of the following:

[0092] The terminal device sends indication information of the multi-access service to the core network;

[0093] The terminal device receives response information of the multi-access service sent by the core network;

[0094] The terminal device sends an activation request of the multi-access service to the core network;

[0095] The terminal device receives an activation response of the multi-access service from the core network.

[0096] Through the above process, the terminal device confirms that it is in the multi-access service; in this case, the terminal device can send a first message to the access node to instruct the access node to determine a target access node from the access networks corresponding to the allowed radio access technologies (RATs).

[0097] In some examples, the allowed RATs include:

[0098] (1) the RAT corresponding to the access network to which the access node belongs; or

[0099] (2) a restricted RAT list containing the RAT corresponding to the access network to which the access node belongs.

[0100] Taking the scenarios shown in FIGS. 3A and 3B as examples, for example, the terminal device sends a first message to the access node (such as the access node of AN1 in FIGS. 3A / 3B) to instruct the access node of AN1 to determine a target access node from the access networks corresponding to the allowed RATs. In this example, the allowed RATs include RAT1; or the allowed RATs include a restricted RAT list containing RAT1.

[0101] In some embodiments, before the terminal device sends the first message to the access node, the terminal device can also receive configuration information of the allowed RATs. The terminal device can receive the configuration information from the core network device or the access node, and according to the configuration information, the terminal device can know the “allowed RATs” for different access nodes; for example, in the example shown in FIGS. 3A / 3B, for the access node of AN2, the “allowed RATs” are RAT2 or a list containing RAT2.

[0102] In some examples, the first message can include a measurement report.

[0103] In some embodiments, the terminal device sends a measurement report to the access node after receiving the measurement configuration information sent by the access node; wherein the measurement configuration information contains AN / RAT related cell information that needs to be measured and reported by the terminal device, which can contain other RAT related cell information in addition to the above-mentioned "allowed RAT".

[0104] In this case, according to the measurement configuration information, the terminal device can report a measurement report to the access node, which only contains measurement information of cell signals related to the allowed RAT, and does not contain measurement information of cell signals related to other RATs except the allowed RAT, so that the access node can only switch to the access node corresponding to the access network corresponding to the allowed RAT when determining the target access node, and will not switch to other RATs, avoiding the problem of multi-access failure.

[0105] In some embodiments, the terminal device can receive first measurement configuration information sent by the access node, which is used to indicate that the terminal device only reports measurement information of cell signals related to the access network corresponding to the allowed RAT; according to the first measurement configuration information, the terminal device only measures and reports measurement information of cell signals related to the access network corresponding to the allowed RAT to the access node, and does not report measurement information of cell signals related to other RATs, so that the access node can only switch to the access node corresponding to the access network corresponding to the allowed RAT when determining the target access node, and will not switch to other RATs, avoiding the problem of multi-access failure.

[0106] In some embodiments, the first measurement configuration information can only contain configuration information of the allowed RAT. For example, the access node sends first measurement configuration information to the terminal device, which contains the identification of the cell related to the allowed RAT, or the identification of the access node related to the allowed RAT, so that the terminal device measures and reports measurement information of these cell signals related to the access network corresponding to the allowed RAT

[0107] Alternatively, the first measurement configuration information contains AN / RAT related cell information that needs to be measured and reported by the terminal device, which can contain cell information of other RATs in addition to the "allowed RATs" described above. In this case, the first measurement configuration information can also contain an exclusion list containing configuration information of other RATs different from the allowed RATs. For example, the access node sends the first measurement configuration information to the terminal device, which contains the identities of 5 access nodes, including the identity of the access node of Cell 1, the identity of the access node of Cell 2, the identity of the access node of Cell 3, the identity of the access node of Cell 4 and the identity of the access node of Cell 5; wherein Cell 1 and Cell 2 correspond to the allowed RAT, and Cell 3, Cell 4 and Cell 5 correspond to other RATs; the first measurement configuration information also includes an exclusion list, which can contain the identity of the access node of Cell 3, the identity of the access node of Cell 4 and the identity of the access node of Cell 5. According to the first measurement configuration information, the terminal device measures and reports the measurement information of the identity of the access node of Cell 1 and the identity of the access node of Cell 2, so as to ensure that the access node does not change the RAT when performing handover. Alternatively, the first measurement configuration information can also contain an optional list containing configuration information of the allowed RATs. For example, still taking the above example, the access node sends the first measurement configuration information to the terminal device, which contains the identities of 5 access nodes, including the identity of the access node of Cell 1, the identity of the access node of Cell 2, the identity of the access node of Cell 3, the identity of the access node of Cell 4 and the identity of the access node of Cell 5; wherein Cell 1 and Cell 2 correspond to the allowed RAT, and Cell 3, Cell 4 and Cell 5 correspond to other RATs; the first measurement configuration information also includes an optional list, which can contain the identity of the access node of Cell 1 and the identity of the access node of Cell 2; according to the first measurement configuration information, the terminal device measures and reports the measurement information for the optional list (i.e. the identity of the access node of Cell 1 and the identity of the access node of Cell 2), so as to ensure that the access node does not change the RAT when performing handover.

[0108] The premise for the access node to send the first measurement configuration information to the terminal device is that the access node knows that the terminal device is in a multi-access service, and / or knows that the RAT is not allowed to be changed during the handover. In order to make the access node know the foregoing, the terminal device can send first indication information to the access node before receiving the first measurement configuration information sent by the access node, the first indication information being used to indicate that the access node excludes the access node corresponding to the first access network when determining the target access node; or the network device can send the first indication information to the access node before the terminal device receives the first measurement configuration information sent by the access node, the first indication information being used to indicate that the access node excludes the access node corresponding to the first access network when determining the target access node.

[0109] The application embodiment further provides a handover method, and FIG. 6 is a schematic flowchart of a handover method 600 according to an embodiment of the application. The method can be applied to any system shown in FIGS. 1 to 4, but is not limited thereto. The method comprises at least part of the following contents.

[0110] S610, the access node receives the first message sent by the terminal device.

[0111] S620, the access node determines the target access node from the access networks corresponding to the allowed RATs according to the first message.

[0112] In some embodiments, the terminal device can be a multi-access node containing a plurality of terminal devices, or a terminal device containing a plurality of SIM cards or network cards, or a single terminal device.

[0113] The terminal device is in a multi-access service when sending the first message to the access node. In an example, the multi-access service comprises that the terminal device accesses at least two access networks at the same time, and the different access networks correspond to different RATs.

[0114] In some examples, the allowed RATs comprise:

[0115] the RAT corresponding to the access network to which the access node belongs; or

[0116] a restricted RAT list containing the RAT corresponding to the access network to which the access node belongs.

[0117] In some embodiments, the access node receives the first message sent by the terminal device, comprising that the access node receives a measurement report sent by the terminal device, and the measurement report only contains measurement information of a cell signal related to the access network corresponding to the allowed RAT.

[0118] In some embodiments, before receiving the measurement report sent by the terminal device, the access node further comprises: sending, by the access node, first measurement configuration information to the terminal device, the first measurement configuration information being used to instruct the terminal device to report only measurement information of a cell signal of an access network corresponding to the allowed RAT.

[0119] In some embodiments, the first measurement configuration information only contains configuration information of the allowed RAT.

[0120] In some embodiments, the first measurement configuration information contains an exclusion list, and the exclusion list contains configuration information of other RATs different from the allowed RAT.

[0121] In some embodiments, before sending the first measurement configuration information to the terminal device, the access node further comprises:

[0122] The access node receives first indication information sent by the terminal device, and the first indication information is used to indicate at least one of the following:

[0123] The terminal device is in a multi-access service;

[0124] The RAT is not changed during handover;

[0125] The allowed RAT;

[0126] The disallowed RAT.

[0127] In some embodiments, before sending the first measurement configuration information to the terminal device, the access node further comprises:

[0128] The access node receives first indication information sent by the first network element, and the first indication information is used to indicate at least one of the following:

[0129] The terminal device is in a multi-access service;

[0130] The RAT is not changed during handover;

[0131] The allowed RAT.

[0132] For brevity, the detailed description of the access node performing the method 600 of the present embodiment can be referred to the related description of the access node in the method 500 described above.

[0133] The application also proposes a handover method. FIG. 7 is a schematic flowchart of a handover method 700 according to an embodiment of the application. The method can be applied to any of the systems shown in FIGS. 1 to 4, but is not limited thereto. The method comprises at least part of the following contents.

[0134] S710, the first network element sends first indication information to the access node, the first indication information being used for indicating at least one of the following:

[0135] The terminal device is in a multi-access service;

[0136] The RAT is not changed during the switching;

[0137] The allowed RAT.

[0138] The first network element can include a core network element, such as an Access and Mobility Management Function (AMF) or a Mobility Management Entity (MME).

[0139] In some embodiments, the allowed RAT includes:

[0140] The RAT corresponding to the access network to which the access node belongs; or

[0141] A restricted RAT list containing the RAT corresponding to the access network to which the access node belongs.

[0142] The access node of the present embodiment performs the method 700. For brevity, the detailed description of the method 500 regarding the first network element is not repeated here.

[0143] The embodiments will be described in detail below with reference to the accompanying drawings.

[0144] Embodiment One:

[0145] In the present embodiment, the terminal device (such as a UE) reports only the measurement information of the same RAT. The UE first accesses and registers from two accesses, and after determining to activate the multi-access service, only the measurement information of the same RAT is reported when receiving the measurement configuration information from the AN and performing the measurement, thereby avoiding the change of the RAT due to the switching.

[0146] For example, in the scenario shown in FIGS. 3A / 3B, the UE accesses AN1 and AN2 at the same time, the RAT used by AN1 is RAT1, and the RAT used by AN2 is RAT2. After determining to activate the multi-access service of the UE, the UE only reports the Cell information related to RAT1 or only reports the Cell information containing the RAT group related to RAT1 after receiving the measurement configuration information sent by the access node of AN1 when performing the measurement, so as to ensure that the access node of AN1 will not switch to an AN different from RAT1 or an AN different from the group to which RAT1 belongs when selecting the target access node.

[0147] Figure 8 is a flowchart according to the first embodiment of the present application. As shown in Figure 8, the specific implementation process of this embodiment is as follows:

[0148] S800, the device (such as UE) accesses two ANs respectively through the registration process of multi-access.

[0149] Among them, the UE can send the indication information of multi-access service to the core network, which is used to inform the core network that the UE has multi-access capability; the core network can send the indication information of multi-access service to the UE, which is used to inform the UE that the UE has multi-access capability. The above-mentioned indication information of multi-access service can implicitly indicate the activation or start of use of multi-access service.

[0150] Or, other information can also be used to explicitly indicate the activation or start of use of multi-access service. For example, the UE sends an activation request of multi-access service to the core network, and the core network sends an activation response of multi-access service to the UE. The activation request and / or the activation response are used to explicitly indicate the activation or start of use of multi-access service.

[0151] S801, the access node of AN1 sends measurement configuration information to the UE, which contains a plurality of cell information that needs to be measured and reported by the UE, for example, contains other RAT (different from the current RAT, or different from the current RAT group, the RAT group can include a plurality of RATs) related configuration information, that is, the UE needs to measure and report the Cell information related to other RATs.

[0152] S802, the UE measures according to the measurement configuration information sent by the access node of AN1, which can stop measuring the Cell signal related to other RATs according to the current RAT information of AN1, or can not be improved, and still measures normally according to the measurement configuration information sent by AN1.

[0153] S803, the UE sends a measurement report (Measurement Report) to the access node of AN1, which excludes the measurement information of other RAT related cells.

[0154] S804, the access node of AN1 determines the target AN (Target AN) according to the Measurement Report reported by the UE, and since it does not contain the measurement information of other RAT related cells, it will not select the cells / ANs corresponding to other RATs as the Target AN. For example, according to the measurement report reported by the UE, the access node of AN1 selects the access node of the cell with the best measurement result as the target access node.

[0155] S805, subsequent handover process.

[0156] Through the embodiment, based on the UE side implementation, the UE can avoid reporting the measurement information of other RATs, thereby avoiding the case of switching to other RATs due to handover, and avoiding the problem of multi-access failure.

[0157] Embodiment two:

[0158] In the embodiment, the UE reports the indication information, and the AN updates the measurement configuration information. The UE reports the multi-access indication information or the restricted RAT information to the AN, and the AN determines / updates the measurement configuration information according to the received information. The configuration information excludes the information of other RATs different from the allowed RATs. Therefore, the UE reports only the cell information related to the allowed RATs according to the configuration information, thereby ensuring that the access node does not change the RAT during handover.

[0159] For example, in the scenario shown in FIG. 3A / 3B, the UE accesses the AN1 and the AN2 simultaneously, the AN1 uses the RAT1, and the AN2 uses the RAT2. After determining to activate the multi-access service of the UE, the UE sends the multi-access indication information or the restricted RAT information to the access node of the AN1, and the access node of the AN1 determines / updates the measurement configuration information according to the received information. The measurement configuration information excludes the information of other RATs different from the allowed RATs (for example, the RAT1 or the RAT group to which the RAT1 belongs). Therefore, the UE reports only the cell information related to the allowed RATs according to the configuration information, thereby ensuring that the access node does not change the RAT during handover.

[0160] FIG. 9 is a flowchart of the implementation according to the second embodiment of the present application. As shown in FIG. 9, the specific implementation process of the embodiment is as follows:

[0161] S900, the device (such as the UE) accesses two ANs through the multi-access registration process.

[0162] The UE can send the indication information of the multi-access service to the core network, and the indication information is used to inform the core network that the UE has the multi-access capability. The core network can send the indication information of the multi-access service to the UE, and the indication information is used to inform the UE that the UE has the multi-access capability. The above-mentioned indication information of the multi-access service can implicitly indicate the activation or start of the multi-access service.

[0163] Alternatively, other information can also be used to explicitly indicate the activation or start of the multi-access service. For example, the UE sends the activation request of the multi-access service to the core network, and the core network sends the activation response of the multi-access service to the UE. The activation request and / or the activation response are used to explicitly indicate the activation or start of the multi-access service.

[0164] The S901 and AN1 access nodes send measurement configuration information to the UE, which includes information about multiple cells that the UE needs to measure and report. For example, it includes configuration information related to other RATs (different from the current RAT, or different from the current RAT group; a RAT group can include multiple RATs), meaning the UE needs to measure and report cell information related to other RATs. This step is optional; it is possible that the UE sends the information in step 2 to the AN1 access node before the AN1 access node sends the measurement configuration information to the UE, in which case this step will not occur.

[0165] S902, the UE sends a message to the access node of AN1, which may be in the form of UE Assistance Information or other forms. The message carries multiple access indication information (which can be used to instruct the AN not to switch RATs) and / or restricted RAT (List) information (which may be one or more allowed RATs), etc.

[0166] The access nodes of S903 and AN1 send measurement configuration information to the UE, which may exclude other RATs (frequency, cell, and other configuration information) as an exclusion list; or when configuring the optional measurement list, it may only include the configuration information of RATs that are the same as RAT1 or the RAT group to which RAT1 belongs, or only include the configuration information of restricted RATs.

[0167] S904. The UE performs measurements based on the measurement configuration information sent by the access node of AN1.

[0168] S905, the UE sends a Measurement Report to the access node of AN1, which does not include measurement information for cells related to other RATs. For example, the other RAT is a RAT other than RAT1, or a RAT other than the RAT group to which RAT1 belongs.

[0169] The access nodes of S906 and AN1 determine the Target AN based on the information reported by the UE. Since the measurement report received via S905 does not contain measurement information related to other RATs, the Cell / AN corresponding to other RATs will not be selected as the Target AN. For example, based on the measurement report reported by the UE, the access node of AN1 selects the access node of the cell with the best measurement results as the target access node.

[0170] S907, subsequent switchover process.

[0171] This solution primarily avoids changes to the RAT due to handover by having the UE report multi-access indication information or restricted RAT information to the AN.

[0172] Embodiment Three

[0173] In this embodiment, the core network configures the limited RAT of the UE. For example, the core network configures the context information of the UE for the current AN, and simultaneously configures the limited RAT. The current AN configures the limited RAT information when it issues the measurement configuration information of the UE according to the limited information configured by the core network, so as to avoid the influence on the multi-access service caused by the change of the RAT during the handover. The limited RAT can include the allowed RAT, such as the RAT used by the current AN or the RAT group to which the RAT used by the current AN belongs.

[0174] For example, in the scenario shown in FIG. 3A / 3B, the UE accesses the AN1 and the AN2 simultaneously. After it is determined that the multi-access service of the UE is activated, the core network of the AN1 configures the limited RAT of the UE for the access node of the AN1, and the access node of the AN1 determines the measurement configuration information according to the received information, which excludes the information of other RATs different from the allowed RAT (for example, the RAT1 or the RAT group to which the RAT1 belongs). Therefore, the UE reports only the cell information related to the allowed RAT according to the configuration information, so as to ensure that the access node does not change the RAT during the handover.

[0175] FIG. 10 is a flowchart of the implementation according to Embodiment Three of the present application. As shown in FIG. 10, the specific implementation process of this embodiment is as follows:

[0176] S1000, the device (such as the UE) accesses two ANs through the registration process of the multi-access respectively.

[0177] The UE can send the indication information of the multi-access service to the core network, which is used to inform the core network that the UE has the multi-access capability; the core network can send the indication information of the multi-access service to the UE, which is used to inform the UE that the UE has the multi-access capability. The above-mentioned indication information of the multi-access service can implicitly indicate the activation or start of the use of the multi-access service.

[0178] Alternatively, other information can also be used to explicitly indicate the activation or start of the use of the multi-access service. For example, the UE sends the activation request of the multi-access service to the core network, and the core network sends the activation response of the multi-access service to the UE. The activation request and / or the activation response are used to explicitly indicate the activation or start of the use of the multi-access service.

[0179] S1001, a core network element (such as AMF / MME, etc.) of AN1 configures a mobile control information (may also be other messages, here taking the mobile control information as an example) for an access node of AN1, which contains multi-access indication information or information of a restricted RAT / RAT list, or contains the multi-access indication information and the information of the restricted RAT / RAT list. The restricted RAT can be a RAT used by AN1, and the restricted RAT list can be a RAT group to which a RAT used by AN1 belongs.

[0180] S1002, the access node of AN1 generates measurement configuration information according to the mobile control information sent by the core network element, wherein when other RATs (frequency, Cell, etc. configuration information) are possibly configured as an excluded list, only configuration information of the same RAT as RAT1 or a RAT group to which RAT1 belongs is contained, or only configuration information of the restricted RAT is contained.

[0181] S1003, the access node of AN1 sends the measurement configuration information to the UE, wherein only configuration information of the same RAT as RAT1 or a RAT group to which RAT1 belongs is contained, or only configuration information of the restricted RAT is contained; or configuration information related to other RATs is contained in the excluded list, that is, the UE is prohibited from measuring and reporting Cell information related to other RATs.

[0182] S1004, the UE measures according to the measurement configuration information sent by the access node of AN1.

[0183] S1005, the UE sends a measurement report (Measurement Report) to the access node of AN1, wherein measurement information of a Cell related to other RATs is not contained. For example, the other RATs are other RATs except RAT1, or other RATs except a RAT group to which RAT1 belongs.

[0184] S1006, the access node of AN1 determines a target AN according to the information reported by the UE, and since the measurement report received through S1005 does not contain measurement information related to other RATs, a Cell / AN corresponding to the other RATs will not be selected as the target AN. For example, according to the measurement report reported by the UE, the access node of AN1 selects an access node of a cell with the best measurement result as the target access node.

[0185] S1007, a subsequent handover process.

[0186] The scheme mainly configures the AN by the core network, sends multi-access indication or restricted RAT information, and then the AN can exclude Cells related to other RATs when generating measurement configuration information.

[0187] Embodiments of the present application also provide a terminal device. FIG. 11 is a schematic block diagram of a terminal device 1100 according to an embodiment of the present application. The terminal device 1100 can include:

[0188] The first transceiver module 1110 is configured to send a first message to the access node, where the first message is used by the access node to determine a target access node from the access networks corresponding to the allowed RATs.

[0189] In some embodiments, the first transceiver module 1110 is further configured to perform at least one of the following:

[0190] send indication information of the multi-access service to the core network;

[0191] receive response information of the multi-access service sent by the core network;

[0192] send an activation request of the multi-access service to the core network;

[0193] receive an activation response of the multi-access service from the core network.

[0194] In some embodiments, the multi-access service includes:

[0195] The terminal device simultaneously accesses at least two access networks, and the different access networks correspond to different RATs.

[0196] In some embodiments, the allowed RATs include:

[0197] a RAT corresponding to an access network to which the access node belongs; or

[0198] a list of restricted RATs, and the list of restricted RATs includes a RAT corresponding to an access network to which the access node belongs.

[0199] In some embodiments, the first transceiver module 1110 is further configured to receive configuration information of the allowed RATs.

[0200] In some embodiments, the first transceiver module 1110 is configured to send a measurement report to the access node, where the measurement report only includes measurement information of cell signals related to the access networks corresponding to the allowed RATs.

[0201] In some embodiments, the first transceiver module 1110 is further configured to receive first measurement configuration information sent by the access node, where the first measurement configuration information is used to instruct the terminal device to only report measurement information of cell signals related to the access networks corresponding to the allowed RATs.

[0202] In some embodiments, the first measurement configuration information only includes configuration information of the allowed RATs.

[0203] In some embodiments, the first measurement configuration information comprises an exclusion list, and the exclusion list comprises configuration information of other RATs different from the allowed RATs.

[0204] In some embodiments, the first transceiver 1110 is further configured to send, to the access node, first indication information, the first indication information being used to indicate at least one of the following:

[0205] The terminal device is in multi-access service;

[0206] The RAT is not changed during handover;

[0207] The allowed RATs;

[0208] The disallowed RATs.

[0209] The terminal device 1100 of the embodiments of the present application can realize the corresponding functions of the terminal device in the foregoing method embodiments. The corresponding processes, functions, implementation manners and beneficial effects of each module (sub-module, unit or component, etc.) in the terminal device 1100 can be referred to the corresponding description in the foregoing method embodiments, which will not be described here. It should be noted that the functions described with respect to each module (sub-module, unit or component, etc.) in the terminal device 1100 of the embodiments of the present application can be realized by different modules (sub-modules, units or components, etc.), or can be realized by the same module (sub-module, unit or component, etc.).

[0210] The embodiments of the present application also propose an access node. FIG. 12 is a schematic block diagram of an access node 1200 according to an embodiment of the present application. The access node 1200 can comprise:

[0211] The second transceiver 1210 is configured to receive the first message sent by the terminal device;

[0212] The first processing module 1220 is configured to determine, according to the first message, a target access node from the access networks corresponding to the allowed RATs.

[0213] In some embodiments, the terminal device simultaneously accesses at least two access networks, and the RATs corresponding to different access networks are different.

[0214] In some embodiments, the allowed RATs comprise:

[0215] The RAT corresponding to the access network to which the access node belongs; or

[0216] A limited RAT list, and the limited RAT list comprises the RAT corresponding to the access network to which the access node belongs.

[0217] In some embodiments, the second transceiver module 1210 is configured to receive a measurement report sent by the terminal device, the measurement report comprising measurement information of a cell signal of an access network corresponding to the allowed RAT only.

[0218] In some embodiments, the second transceiver module 1210 is further configured to send first measurement configuration information to the terminal device, the first measurement configuration information being used to instruct the terminal device to report measurement information of a cell signal of an access network corresponding to the allowed RAT only.

[0219] In some embodiments, the first measurement configuration information comprises configuration information of the allowed RAT only.

[0220] In some embodiments, the first measurement configuration information comprises an exclusion list, the exclusion list comprising configuration information of other RATs different from the allowed RAT.

[0221] In some embodiments, the second transceiver module 1210 is further configured to receive first indication information sent by the terminal device, the first indication information being used to indicate at least one of the following:

[0222] The terminal device is in a multi-access service;

[0223] The RAT is not changed during handover;

[0224] The allowed RAT;

[0225] The disallowed RAT.

[0226] In some embodiments, the second transceiver module 1210 is further configured to receive first indication information sent by the first network element, the first indication information being used to indicate at least one of the following:

[0227] The terminal device is in a multi-access service;

[0228] The RAT is not changed during handover;

[0229] The allowed RAT.

[0230] The access node 1200 of the embodiments of the present application can realize the corresponding functions of the access node in the method embodiments described above. The corresponding processes, functions, implementation manners and advantages of each module (sub-module, unit or component, etc.) in the access node 1200 can be referred to the corresponding description in the method embodiments described above, and will not be described here. It should be noted that the functions described with respect to each module (sub-module, unit or component, etc.) in the access node 1200 of the embodiments of the present application can be realized by different modules (sub-modules, units or components, etc.), or can be realized by the same module (sub-module, unit or component, etc.).

[0231] The embodiment of the present application further provides a first network element. FIG. 13 is a schematic block diagram of a first network element 1300 according to an embodiment of the present application. The first network element 1300 can include:

[0232] a third transceiving module 1310, configured to send first indication information to an access node, the first indication information being used to indicate at least one of the following:

[0233] that the terminal device is in a multi-access service;

[0234] that the RAT is not changed during switching;

[0235] allowed RATs.

[0236] In some embodiments, the allowed RATs include:

[0237] a RAT corresponding to an access network to which the access node belongs; or

[0238] a list of restricted RATs, the list of restricted RATs containing a RAT corresponding to an access network to which the access node belongs.

[0239] The first network element 1300 of the embodiment of the present application can realize the corresponding functions of the first network element in the method embodiments described above. The corresponding processes, functions, implementation manners and beneficial effects of each module (sub-module, unit or component, etc.) in the first network element 1300 can be referred to the corresponding description in the method embodiments described above, which will not be described here again. It should be noted that the functions described with respect to each module (sub-module, unit or component, etc.) in the first network element 1300 of the embodiment of the present application can be realized by different modules (sub-modules, units or components, etc.), or can be realized by the same module (sub-module, unit or component, etc.).

[0240] FIG. 14 is a schematic structural diagram of a communication device 1400 according to an embodiment of the present application. The communication device 1400 includes a processor 1410, which can call and run a computer program from a memory to enable the communication device 1400 to implement the method in the embodiments of the present application.

[0241] In an embodiment, the communication device 1400 can further include a memory 1420. The processor 1410 can call and run a computer program from the memory 1420 to enable the communication device 1400 to implement the method in the embodiments of the present application.

[0242] The memory 1420 can be a separate device independent of the processor 1410, or can be integrated in the processor 1410.

[0243] In an embodiment, the communication device 1400 can further include a transceiver 1430, and the processor 1410 can control the transceiver 1430 to communicate with other devices, specifically, to send information or data to other devices or receive information or data sent by other devices.

[0244] The transceiver 1430 can include a transmitter and a receiver. The transceiver 1430 can further include an antenna, and the number of antennas can be one or more.

[0245] In an embodiment, the communication device 1400 can be an access node and a first network element of the embodiments of the present application, and the communication device 1400 can implement the corresponding procedures implemented by the access node and the first network element in the various methods of the embodiments of the present application. For brevity, details are not described herein.

[0246] In an embodiment, the communication device 1400 can be a terminal device of the embodiments of the present application, and the communication device 1400 can implement the corresponding procedures implemented by the terminal device in the various methods of the embodiments of the present application. For brevity, details are not described herein.

[0247] FIG. 15 is a schematic structural diagram of a chip 1500 according to an embodiment of the present application. The chip 1500 includes a processor 1510, which can call and run a computer program from a memory to implement the method in the embodiments of the present application.

[0248] In an embodiment, the chip 1500 can further include a memory 1520. The processor 1510 can call and run a computer program from the memory 1520 to implement the method executed by the terminal device or the network device in the embodiments of the present application.

[0249] The memory 1520 can be a separate device independent of the processor 1510, or can be integrated in the processor 1510.

[0250] In an embodiment, the chip 1500 can further include an input interface 1530. The processor 1510 can control the input interface 1530 to communicate with other devices or chips, specifically, to obtain information or data sent by other devices or chips.

[0251] In an embodiment, the chip 1500 can further include an output interface 1540. The processor 1510 can control the output interface 1540 to communicate with other devices or chips, specifically, to output information or data to other devices or chips.

[0252] In an embodiment, the chip can be applied to the access node and the first network element in the embodiments of the present application, and the chip can implement the corresponding procedures implemented by the access node and the first network element in the various methods of the embodiments of the present application. For brevity, details are not repeated here.

[0253] In an embodiment, the chip can be applied to the terminal device in the embodiments of the present application, and the chip can implement the corresponding procedures implemented by the terminal device in the various methods of the embodiments of the present application. For brevity, details are not repeated here.

[0254] The chip applied to the network device and the terminal device can be the same chip or different chips.

[0255] It should be understood that the chip mentioned in the embodiments of the present application can also be referred to as a system-on-chip, a system chip, a chip system or a system-on-chip, etc.

[0256] The processor mentioned above can be a general-purpose processor, a digital signal processor (DSP), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC) or other programmable logic devices, transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processor mentioned above can be a microprocessor or any conventional processor, etc.

[0257] The memory mentioned above can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, 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).

[0258] It should be understood that the above-mentioned memory is an example but not a limiting description, for example, the memory in the embodiments of the present application can also be static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM) and the like. That is, the memory in the embodiments of the present application is intended to include but not limited to these and any other suitable type of memory.

[0259] In the above-mentioned embodiments, all or part can be realized by software, hardware, firmware or any combination thereof. When realized by software, all or part can be realized in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, all or part of the computer program instructions generate the flow or function according to the embodiments of the present application. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another, for example, the computer instructions can be transferred from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media. The available medium can be a magnetic medium (for example, floppy disk, hard disk, magnetic tape), optical medium (for example, DVD) or semiconductor medium (for example, solid state disk (SSD)) and the like.

[0260] It should be understood that in various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, the execution order of the processes should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0261] Those skilled in the art can clearly understand the specific working process of the system, device and unit described above for the convenience and brevity of description, which can refer to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0262] The above merely describes specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A handover method, comprising: sending, by a terminal device, a first message to an access node, the first message being used for the access node to determine a target access node from access networks corresponding to allowed radio access technologies (RATs). 2.The method of claim 1, before the terminal device sends the first message to the access node, further comprising at least one of: sending, by the terminal device, an indication of a multi-access service to a core network; receiving, by the terminal device, a response of the multi-access service from the core network; sending, by the terminal device, an activation request of the multi-access service to the core network; receiving, by the terminal device, an activation response of the multi-access service from the core network.

3. The method of claim 2, wherein, The multi-access service comprises: simultaneously accessing, by the terminal device, at least two access networks, different access networks corresponding to different RATs.

4. The method of any one of claims 1-3, wherein, The allowed RATs comprise: a RAT corresponding to an access network to which the access node belongs; or a restricted RAT list containing a RAT corresponding to an access network to which the access node belongs. 5.The method of any one of claims 1-4, before the terminal device sends the first message to the access node, further comprising: receiving, by the terminal device, configuration information of the allowed RATs.

6. The method of any one of claims 1-5, wherein, The terminal device sending the first message to the access node comprises: sending, by the terminal device, a measurement report to the access node, the measurement report containing only measurement information of cell signals related to access networks corresponding to the allowed RATs. 7.The method of claim 6, before the terminal device sends the measurement report to the access node, further comprising: receiving, by the terminal device, first measurement configuration information sent by the access node, the first measurement configuration information being used to instruct the terminal device to report only measurement information of cell signals related to access networks corresponding to the allowed RATs.

8. The method of claim 7, wherein, The first measurement configuration information contains only configuration information of the allowed RATs.

9. The method of claim 7, wherein, The first measurement configuration information contains an exclusion list containing configuration information of other RATs different from the allowed RATs. 10.The method of any one of claims 7-9, before the terminal device receives the first measurement configuration information sent by the access node, further comprising: sending, by the terminal device, first indication information to the access node, the first indication information being used to indicate at least one of: the terminal device being in a multi-access service; not changing a RAT during handover; the allowed RATs; not allowed RATs. 11.A handover method, comprising: receiving, by an access node, a first message sent by a terminal device; determining, by the access node, a target access node from access networks corresponding to allowed radio access technologies (RATs) according to the first message.

12. The method of claim 11, wherein, The terminal device simultaneously accesses at least two access networks, different access networks corresponding to different RATs.

13. The method of claim 11 or 12, wherein, The allowed RATs comprise: a RAT corresponding to an access network to which the access node belongs; or a restricted RAT list containing a RAT corresponding to an access network to which the access node belongs.

14. The method of claim 13, wherein, The access node receives a first message sent by the terminal device, and the first message comprises: The access node receives a measurement report sent by the terminal device, and the measurement report only comprises measurement information of a cell signal of an access network corresponding to the allowed RAT.

15. The method of claim 14, before the access node receives the measurement report sent by the terminal device, further comprising: The access node sends first measurement configuration information to the terminal device, and the first measurement configuration information is used to instruct the terminal device to only report measurement information of a cell signal of an access network corresponding to the allowed RAT.

16. The method of claim 15, wherein, The first measurement configuration information only comprises configuration information of the allowed RAT.

17. The method of claim 15, wherein, The first measurement configuration information comprises an exclusion list, and the exclusion list comprises configuration information of other RATs different from the allowed RAT.

18. The method of any one of claims 15-17, before the access node sends the first measurement configuration information to the terminal device, further comprising: The access node receives first indication information sent by the terminal device, and the first indication information is used to indicate at least one of the following: The terminal device is in a multi-access service; A RAT is not changed during handover; The allowed RAT; A disallowed RAT.

19. The method of any one of claims 15-17, before the access node sends the first measurement configuration information to the terminal device, further comprising: The access node receives first indication information sent by a first network element, and the first indication information is used to indicate at least one of the following: The terminal device is in a multi-access service; A RAT is not changed during handover; The allowed RAT.

20. A handover method, comprising: A first network element sends first indication information to an access node, and the first indication information is used to indicate at least one of the following: The terminal device is in a multi-access service; A RAT is not changed during handover; The allowed RAT.

21. The method of claim 20, wherein, The allowed RAT comprises: A RAT corresponding to an access network to which the access node belongs; or A restricted RAT list comprising a RAT corresponding to an access network to which the access node belongs.

22. A terminal device, comprising: A first transceiver module configured to send a first message to an access node, and the first message is used for the access node to determine a target access node from an access network corresponding to an allowed RAT.

23. The terminal device of claim 22, the first transceiver module is further configured to at least one of the following: Send indication information of a multi-access service to a core network; Receive response information of the multi-access service sent by the core network; Send an activation request of the multi-access service to the core network; Receive an activation response of the multi-access service from the core network.

24. The terminal device of claim 23, wherein, The multi-access service comprises: The terminal device simultaneously accesses at least two access networks, and different access networks correspond to different RATs.

25. The terminal device of any one of claims 22-24, wherein, The allowed RAT comprises: A RAT corresponding to an access network to which the access node belongs; or A restricted RAT list comprising a RAT corresponding to an access network to which the access node belongs.

26. The terminal device of any of claims 22-25, wherein the first transceiver module is further configured to receive configuration information of the allowed RAT.

27. The terminal device of any one of claims 22-26, wherein, The first transceiver module is configured to send a measurement report to the access node, wherein the measurement report includes only measurement information of cell signals of access networks corresponding to the allowed RAT.

28. The terminal device of claim 27, wherein the first transceiver module is further configured to receive first measurement configuration information sent by the access node, wherein the first measurement configuration information is used to instruct the terminal device to report only measurement information of cell signals of access networks corresponding to the allowed RAT.

29. The terminal device of claim 28, wherein, The first measurement configuration information includes only configuration information of the allowed RAT.

30. The terminal device of claim 28, wherein, The first measurement configuration information includes an exclusion list, wherein the exclusion list includes configuration information of other RATs different from the allowed RAT.

31. The terminal device of any of claims 28-30, wherein the first transceiver module is further configured to send first indication information to the access node, wherein the first indication information is used to indicate at least one of the following: The terminal device is in a multi-access service; The RAT is not changed during handover; The allowed RAT; The unallowed RAT.

32. An access node comprising: A second transceiver module configured to receive a first message sent by a terminal device; A first processing module configured to determine a target access node from access networks corresponding to an allowed RAT based on the first message.

33. The access node of claim 32, wherein, The terminal device is simultaneously connected to at least two access networks, wherein the access networks correspond to different RATs.

34. The access node of claim 32 or 33, wherein, The allowed RAT includes: A RAT corresponding to an access network to which the access node belongs; or A restricted RAT list including a RAT corresponding to an access network to which the access node belongs.

35. The access node of claim 34, wherein, The second transceiver module is configured to receive a measurement report sent by the terminal device, wherein the measurement report includes only measurement information of cell signals of access networks corresponding to the allowed RAT.

36. The access node of claim 35, wherein the second transceiver module is further configured to send first measurement configuration information to the terminal device, wherein the first measurement configuration information is used to instruct the terminal device to report only measurement information of cell signals of access networks corresponding to the allowed RAT.

37. The access node of claim 36, wherein, The first measurement configuration information includes only configuration information of the allowed RAT.

38. The access node of claim 36, wherein, The first measurement configuration information includes an exclusion list, wherein the exclusion list includes configuration information of other RATs different from the allowed RAT.

39. The access node of any of claims 36-38, wherein the second transceiver module is further configured to receive first indication information sent by the terminal device, wherein the first indication information is used to indicate at least one of the following: The terminal device is in a multi-access service; The RAT is not changed during handover; The allowed RAT; The unallowed RAT.

40. The access node of any of claims 36-38, wherein the second transceiver module is further configured to receive first indication information transmitted by the first network element, the first indication information indicating at least one of: the terminal device is in a multi-access service; a RAT is not changed at handover; and the allowed RAT.

41. A first network element comprising: a third transceiver module configured to transmit first indication information to an access node, the first indication information indicating at least one of: a terminal device is in a multi-access service; a RAT is not changed at handover; and an allowed RAT. the allowed RAT comprises: a RAT corresponding to an access network to which the access node belongs; or a list of restricted RATs, the list of restricted RATs including a RAT corresponding to an access network to which the access node belongs. a transceiver configured to communicate with other devices, a processor configured to invoke and run a computer program stored in a memory, and the memory configured to store the computer program, wherein the transceiver, the processor, and the memory are configured to cause the terminal device to perform the method of any of claims 1-10. a transceiver configured to communicate with other devices, a processor configured to invoke and run a computer program stored in a memory, and the memory configured to store the computer program, wherein the transceiver, the processor, and the memory are configured to cause the network device to perform the method of any of claims 11-21. a processor configured to invoke and run a computer program stored in a memory, wherein the processor, the memory, and the computer program are configured to cause a device in which the processor and the memory are installed to perform the method of any of claims 1-21.

46. A computer-readable storage medium configured to store a computer program, which, when executed by a device, causes the device to perform the method of any of claims 1-21.

47. A computer program product comprising computer program instructions configured to cause a computer to perform the method of any of claims 1-21.

48. A computer program configured to cause a computer to perform the method of any of claims 1-21.

42. The first network element of claim 41, wherein, ​ ​ ​ 43. A terminal device comprising: ​ 44. A network device comprising: ​ 45. A chip comprising: ​ ​ ​ ​

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