Transfer method, communication device, and storage medium

Abstract

ABSTRACT In the technical solution of the present application, by performing an LTM transfer of a secondary node based on the interaction signaling between a master node and a secondary node, an LTM transfer mechanism is perfected, so that an LTM transfer scheme not only supports continuous transfers within the same central unit, but also supports a transfer between central units, thus improving the applicability and / or diversity of LTM transfers.

Description

Switching method, communication device and storage medium

[0001] Related applications

[0002] This application claims priority to PCT patent application filed with the World Intellectual Property Organization on January 18, 2024, with application number PCT / CN2024 / 073086 and invention name “Switching method, communication equipment and storage medium”, parts of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of communication technology, and in particular to a switching method, communication equipment, and storage medium. Background Art

[0004] In existing protocols, LTM (L1 / L2 Triggered Mobility) switching methods include: after a terminal device reports a measurement report, a network device (such as a master node or a slave node) determines to perform switching and then notifies the terminal device to perform LTM switching.

[0005] During the process of conceiving and implementing this application, the inventors discovered that there are at least the following problems: the existing LTM switching method only supports continuous switching within the same central unit (Intra-CU, Intra-Central Unit), and does not support switching between different central units (Inter-CU, Inter-Central Unit), that is, there is a lack of a clear switching mechanism between different central units.

[0006] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Technical Solutions

[0007] The main purpose of this application is to provide a switching method, communication equipment and storage medium, aiming to improve the LTM switching mechanism to enhance the applicability and / or diversity of LTM switching.

[0008] The present application provides a switching method, which can be applied to at least one secondary node, comprising the following steps:

[0009] S2: Execute LTM switching of the secondary node based on the interactive signaling between the primary node and the secondary node.

[0010] Optionally, the interactive signaling between the primary node and the secondary node includes at least one of secondary node change request signaling, secondary node change request confirmation signaling, secondary node change requirement signaling, secondary node change requirement determination signaling, and secondary node LTM requirement determination signaling.

[0011] Optionally, the method further comprises at least one of the following:

[0012] Send the secondary node change request signaling to the primary node;

[0013] Receive the secondary node change request signaling sent by the primary node;

[0014] Sending a secondary node change request confirmation signaling to the primary node;

[0015] receiving a secondary node change requirement determination signaling and / or a secondary node LTM requirement determination signaling;

[0016] Send downlink control information to the terminal device;

[0017] Receiving time advance information and / or secondary node identification sent by the primary node;

[0018] Send cell handover notification signaling to the master node;

[0019] Send a cell switching command to the terminal device.

[0020] Optionally, the method further comprises at least one of the following:

[0021] The at least one secondary node includes a source secondary node and / or a candidate secondary node;

[0022] Secondary node change request signaling is used to initiate secondary node LTM configuration information;

[0023] The secondary node change requirement signaling carries at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, and a layer 1 measurement event;

[0024] Secondary node change request signaling is used to provide candidate secondary node LTM configuration;

[0025] The secondary node change request signaling carries at least one of a candidate cell identifier, a candidate cell LTM configuration identifier, an LTM configuration identifier comparison list, a requested channel state indication resource configuration, a central unit identifier indication, a central unit identifier, and a central unit identifier comparison list;

[0026] The secondary node change request signaling includes at least one of a secondary node add request, a secondary node modify request, a secondary node release request, and a secondary node LTM request;

[0027] The secondary node change request confirmation signaling includes at least one of a secondary node add request confirmation, a secondary node modify request confirmation, a secondary node release request confirmation, and a secondary node LTM request confirmation;

[0028] The secondary node change request confirmation signaling carries the updated secondary node LTM configuration information;

[0029] The secondary node change requirement determination signaling and / or the secondary node LTM requirement determination signaling are used to determine that the secondary node LTM configuration is complete;

[0030] The downlink control information is used to trigger the terminal device to perform early uplink synchronization with the candidate secondary node;

[0031] The timing advance information is carried in the master node-slave node timing advance information transmission signaling and / or the inter-base station timing advance information transmission signaling;

[0032] The cell handover notification signaling is used to inform the master node to perform a secondary cell group handover;

[0033] The cell handover notification signaling is carried in the secondary node-primary node cell handover notification signaling.

[0034] Optionally, the method further comprises at least one of the following:

[0035] The radio resource control configuration includes a central unit identifier and / or a candidate cell configuration;

[0036] The secondary node change request signaling and / or the secondary node LTM request confirmation signaling carry the central unit identifier;

[0037] The candidate secondary node LTM configuration includes at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, a layer 1 measurement event, and a channel state indication reporting configuration;

[0038] Updating the secondary node LTM configuration information includes at least one of random access configuration, TCI state configuration, channel state indication configuration, radio resource control configuration, layer 1 measurement event, and channel state indication reporting configuration;

[0039] The master node-slave node timing advance information transmission signaling also carries the slave node identification information;

[0040] The candidate auxiliary nodes are auxiliary nodes of different central units;

[0041] The central unit identification indication is used to request the central unit identification indication of the candidate secondary node;

[0042] The central unit identifier and / or the central unit identifier comparison list is used to provide the candidate secondary node central unit identifier;

[0043] The central unit identifier includes a serving cell central unit identifier and / or a candidate cell central unit identifier.

[0044] The present application also provides a switching method, which can be applied to a master node, comprising the steps of:

[0045] S1: Execute LTM switching of the secondary node based on the interactive signaling between the primary node and the secondary node.

[0046] Optionally, the interactive signaling between the primary node and the secondary node includes at least one of secondary node change request signaling, secondary node change request confirmation signaling, secondary node change requirement signaling, secondary node change requirement determination signaling, and secondary node LTM requirement determination signaling.

[0047] Optionally, the method further comprises at least one of the following:

[0048] Receive a secondary node change request signaling sent by a source secondary node;

[0049] Sending a secondary node change request signaling to at least one secondary node;

[0050] Receive a secondary node change request confirmation signaling;

[0051] Sending a secondary node change requirement confirmation signaling and / or a secondary node LTM request confirmation signaling to at least one secondary node;

[0052] receiving timing advance information and / or a secondary node identifier sent by a candidate secondary node;

[0053] Forwarding the timing advance information and / or the secondary node identifier to the source secondary node;

[0054] receiving a cell switching notification signaling sent by a source secondary node;

[0055] Receiving a radio resource reconfiguration completion signaling and / or the first uplink data sent by the terminal device;

[0056] Forwarding the radio resource reconfiguration completion signaling and / or the first uplink data to a target secondary node among the candidate secondary nodes.

[0057] Optionally, the method further comprises at least one of the following:

[0058] The at least one secondary node includes a source secondary node and / or a candidate secondary node;

[0059] Secondary node change request signaling is used to request secondary node LTM configuration information;

[0060] The secondary node change requirement signaling carries at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, and a layer 1 measurement event;

[0061] Sending a secondary node change request signaling to at least one candidate secondary node;

[0062] Secondary node change request signaling is used to request the LTM configuration of a candidate secondary node;

[0063] The secondary node change request signaling carries at least one of a candidate cell identifier, a candidate cell LTM configuration identifier, an LTM configuration identifier comparison list, a requested channel state indication resource configuration, a central unit identifier indication, a central unit identifier, and a central unit identifier comparison list;

[0064] The secondary node change request signaling includes at least one of a secondary node add request, a secondary node modify request, a secondary node release request, and a secondary node LTM request;

[0065] The secondary node change request confirmation signaling includes at least one of a secondary node add request confirmation, a secondary node modify request confirmation, a secondary node release request confirmation, and a secondary node LTM request confirmation;

[0066] The secondary node change request confirmation signaling is used to provide the candidate secondary node LTM configuration;

[0067] The secondary node change requirement determination signaling and / or the secondary node LTM requirement determination signaling are used to determine that the secondary node LTM configuration is complete;

[0068] The timing advance information is carried in the master node-slave node timing advance information transmission signaling and / or the inter-base station timing advance information transmission signaling;

[0069] The cell handover notification signaling is used to inform the master node to perform a secondary cell group handover;

[0070] The cell handover notification signaling is carried in the secondary node-primary node cell handover notification signaling;

[0071] The target secondary node determines that the handover is completed based on the cell handover notification signaling and / or the radio resource reconfiguration completion signaling.

[0072] Optionally, the method further comprises at least one of the following:

[0073] The radio resource control configuration includes a central unit identifier and / or a candidate cell configuration;

[0074] The secondary node change request signaling and / or the secondary node LTM request confirmation signaling carry the central unit identifier;

[0075] The central unit identification indication is used to request the central unit identification indication of the candidate secondary node;

[0076] The central unit identifier and / or the central unit identifier comparison list is used to provide the secondary node central unit identifier;

[0077] The candidate secondary node LTM configuration includes at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, a layer 1 measurement event, and a channel state indication reporting configuration;

[0078] The central unit identifier includes a serving cell central unit identifier and / or a candidate cell central unit identifier;

[0079] The master node-slave node timing advance information transmission signaling also carries the slave node identification information;

[0080] The candidate auxiliary nodes are auxiliary nodes of different central units.

[0081] The present application also provides a switching method, which can be applied to a terminal device (such as a mobile phone), comprising the steps of:

[0082] S3: performing LTM handover based on a cell handover command, where the cell handover command is determined by the secondary node based on interactive signaling between the primary node and the secondary node.

[0083] Optionally, the interactive signaling between the primary node and the secondary node includes at least one of secondary node change request signaling, secondary node change request confirmation signaling, secondary node change requirement signaling, secondary node change requirement determination signaling, and secondary node LTM requirement determination signaling.

[0084] Optionally, step S3 includes at least one of the following:

[0085] The source slave node sends a slave node change request signaling to the master node;

[0086] The primary node sends a secondary node change request signaling to the source secondary node and / or the candidate secondary node;

[0087] The candidate secondary node sends a secondary node change request confirmation signaling to the primary node;

[0088] receiving a radio resource control reconfiguration signaling sent by the master node;

[0089] Sending radio resource control reconfiguration completion signaling to the master node;

[0090] The master node sends a secondary node change requirement confirmation signaling and / or a secondary node LTM request confirmation signaling to the source secondary node based on the radio resource control reconfiguration completion signaling;

[0091] Perform early downlink synchronization of the candidate cell based on the secondary node LTM configuration information in the radio resource control reconfiguration signaling;

[0092] receiving downlink control information sent by the source slave node;

[0093] Sending a random access preamble based on downlink control information;

[0094] The source secondary node sends a cell handover notification signaling to the primary node;

[0095] Sending the first uplink data to the master node based on the time advance information carried in the cell switching command;

[0096] Sending radio resource reconfiguration completion signaling and / or first uplink data to the master node;

[0097] The primary node sends a radio resource reconfiguration completion signaling and / or the first uplink data to a target secondary node among the candidate secondary nodes.

[0098] Optionally, the method further comprises at least one of the following:

[0099] Secondary node change request signaling is used to request secondary node LTM configuration information;

[0100] The secondary node change requirement signaling carries at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, and a layer 1 measurement event;

[0101] The secondary node change request signaling is sent by the primary node;

[0102] The secondary node change request signaling is used to initiate the secondary node change request process;

[0103] The secondary node change request signaling is used to request configuration of at least one candidate cell in the target secondary node;

[0104] The secondary node change request signaling carries at least one of the target candidate cell identifier, the candidate cell LTM configuration identifier, the LTM configuration identifier comparison list, the requested channel state indication resource configuration, the central unit identifier indication, the central unit identifier, and the central unit identifier comparison list;

[0105] The secondary node change request signaling includes at least one of a secondary node add request, a secondary node modify request, a secondary node release request, and a secondary node LTM request;

[0106] The secondary node change request confirmation signaling includes at least one of a secondary node add request confirmation, a secondary node modify request confirmation, a secondary node release request confirmation, and a secondary node LTM request confirmation;

[0107] The secondary node change request confirmation signaling is used to carry feedback signaling;

[0108] The secondary node change request confirmation signaling is used to provide at least one candidate cell configuration in the target secondary node;

[0109] The secondary node change requirement determination signaling and / or the secondary node LTM request determination signaling are used to determine that the radio resource control reconfiguration is completed;

[0110] The time advance information is sent from the candidate slave node to the master node;

[0111] The time advance information is forwarded by the master node to the source slave node;

[0112] The timing advance information is carried in the master node-slave node timing advance information transmission signaling and / or the inter-base station timing advance information transmission signaling;

[0113] The cell handover notification signaling is used to inform the master node to perform a secondary cell group handover;

[0114] The cell handover notification signaling is carried in the secondary node-primary node cell handover notification signaling;

[0115] The target secondary node is determined based on the cell handover notification signaling and / or the radio resource reconfiguration completion signaling;

[0116] The random access preamble is used to trigger the target candidate cell to calculate the time advance information;

[0117] The candidate auxiliary nodes are auxiliary nodes of different central units.

[0118] The present application also provides a communication device, comprising: a memory, a processor, and a switching program stored in the memory and executable on the processor, wherein the switching program implements the steps of any of the switching methods described above when executed by the processor.

[0119] The communication device in this application can be a terminal device (such as a mobile phone) or a network device (such as a master node or a slave node). The specific reference needs to be clarified based on the context.

[0120] The present application also provides a storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of any of the switching methods described above are implemented.

[0121] The technical solution of the present application improves the LTM switching mechanism by executing the secondary node LTM switching based on the interactive signaling between the main node and the secondary node, so that the LTM switching method not only supports continuous switching under the same central unit, but also supports switching between different central units, thereby improving the applicability and / or diversity of LTM switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0122] The accompanying drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without inventive work.

[0123] FIG1 is a schematic diagram of the hardware structure of a mobile terminal for implementing various embodiments of the present application;

[0124] FIG2 is a diagram of a communication network system architecture provided by an embodiment of the present application;

[0125] FIG3 is a schematic diagram of the hardware structure of a controller 140 provided in this application;

[0126] FIG4 is a schematic diagram of the hardware structure of a network node 150 provided in this application;

[0127] FIG5 is a schematic flow chart of a switching method according to the first embodiment;

[0128] FIG6 is a schematic diagram of an interaction sequence according to a second embodiment;

[0129] FIG7 is a schematic diagram of an interaction sequence according to an eighth embodiment;

[0130] FIG8 is a schematic flow chart of a switching method according to a twelfth embodiment;

[0131] FIG9 is a first structural diagram of a switching device provided in an embodiment of the present application;

[0132] FIG10 is a second structural diagram of a switching device provided in an embodiment of the present application;

[0133] FIG11 is a third structural diagram of a switching device provided in an embodiment of the present application;

[0134] FIG12 is a schematic diagram of the structure of the communication device provided in an embodiment of the present application.

[0135] The purpose of this application, its features, and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings. The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and the accompanying text are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of this application to those skilled in the art by reference to specific embodiments.

[0136] Implementation Methods of the Application

[0137] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0138] It should be noted that, in this document, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element, and / or, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context of the specific embodiment.

[0139] It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are used solely to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the term "if," as used herein, may be interpreted as "upon," "when," or "in response to a determination." Furthermore, as used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprising" and "including" indicate the presence of the recited features, steps, operations, elements, components, items, types, and / or groups, but do not preclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, types, and / or groups. The terms "or," "and / or," "including at least one of the following," etc., as used herein, may be interpreted as inclusive, meaning any one or any combination. For example, “comprising at least one of the following: A, B, C” means “any of the following: A; B; C; A and B; A and C; B and C; A and B and C”; and for another example, “A, B or C” or “A, B and / or C” means “any of the following: A; B; C; A and B; A and C; B and C; A and B and C”. An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some manner.

[0140] It should be understood that, although the various steps in the flowchart in the embodiment of the present application are shown in sequence according to the indication of the arrows, these steps are not necessarily performed in sequence in the order indicated by the arrows. Unless clearly stated herein, the execution of these steps is not strictly limited in order, and they can be performed in other orders. Moreover, at least a portion of the steps in the figure may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and their execution order is not necessarily performed in sequence, but can be performed in turn or alternately with at least a portion of other steps or sub-steps or stages of other steps.

[0141] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0142] It should be noted that in this article, step codes such as S1 and S2 are used for the purpose of expressing the corresponding content more clearly and concisely, and do not constitute a substantial restriction on the order. When technical personnel in this field implement the specific steps, they may execute S2 first and then S1, etc., but these should all be within the scope of protection of this application.

[0143] It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0144] In the subsequent description, the use of suffixes such as "module", "component" or "unit" to represent elements is only for the purpose of facilitating the description of the present application and has no specific meaning. Therefore, "module", "component" or "unit" can be used interchangeably.

[0145] The communication device in this application can be a terminal device (such as a mobile phone) or a network device (such as a master node or a slave node). The specific reference needs to be clarified based on the context.

[0146] The terminal device may be implemented in various forms. For example, the terminal device described in this application may include intelligent terminal devices such as mobile phones, tablet computers, laptop computers, PDAs, portable media players (PMPs), navigation devices, wearable devices, smart bracelets, pedometers, and other fixed terminal devices such as digital TVs and desktop computers.

[0147] The subsequent description will be made using a mobile terminal as an example. Those skilled in the art will understand that, in addition to components specifically used for mobile purposes, the configuration according to the embodiments of the present application can also be applied to fixed-type terminal devices.

[0148] Please refer to Figure 1, which is a schematic diagram of the hardware structure of a mobile terminal for implementing various embodiments of the present application. The mobile terminal 100 may include components such as an RF (Radio Frequency) unit 101, a WiFi module 102, an audio output unit 103, an A / V (Audio / Video) input unit 104, a sensor 105, a display unit 106, a user input unit 107, an interface unit 108, a memory 109, a processor 110, and a power supply 111. Those skilled in the art will understand that the mobile terminal structure shown in Figure 1 does not limit the mobile terminal. The mobile terminal may include more or fewer components than shown, or may combine certain components, or arrange the components differently.

[0149] The following is a detailed introduction to the various components of the mobile terminal in conjunction with Figure 1:

[0150] The RF unit 101 can be used to send and receive information or receive signals during calls. Specifically, it receives downlink information from the base station and transmits it to the processor 110 for processing. It also transmits uplink data to the base station. Typically, the RF unit 101 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, and / or other components. Furthermore, the RF unit 101 can communicate with the network and other devices via wireless communication. The above-mentioned wireless communications can use any communication standard or protocol, including but not limited to GSM (Global System of Mobile communication), GPRS (General Packet Radio Service), CDMA2000 (Code Division Multiple Access 2000), WCDMA (Wideband Code Division Multiple Access), TD-SCDMA (Time Division-Synchronous Code Division Multiple Access), FDD-LTE (Frequency Division Duplexing-Long Term Evolution), TDD-LTE (Time Division Duplexing-Long Term Evolution), 5G NR (New Radio) and 6G, etc.

[0151] WiFi is a short-range wireless transmission technology. A mobile terminal, through WiFi module 102, enables users to send and receive emails, browse web pages, and access streaming media, providing wireless broadband Internet access. Although FIG1 illustrates WiFi module 102, it is understood that it is not a required component of the mobile terminal and can be omitted as needed without altering the essence of the invention.

[0152] The audio output unit 103 can convert audio data received by the RF unit 101 or the WiFi module 102 or stored in the memory 109 into an audio signal and output it as sound when the mobile terminal 100 is in a call signal reception mode, a talk mode, a recording mode, a voice recognition mode, a broadcast reception mode, or the like. Furthermore, the audio output unit 103 can also provide audio output related to a specific function performed by the mobile terminal 100 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 103 may include a speaker, a buzzer, or the like.

[0153] The A / V input unit 104 is used to receive audio or video signals. The A / V input unit 104 may include a graphics processing unit (GPU) 1041 and a microphone 1042. The GPU 1041 processes image data of still images or videos captured by an image capture device (e.g., a camera) in video capture mode or image capture mode. The processed image frames may be displayed on the display unit 106. The image frames processed by the GPU 1041 may be stored in the memory 109 (or other storage medium) or transmitted via the RF unit 101 or the WiFi module 102. The microphone 1042 may receive sound (audio data) in operating modes such as a phone call mode, a recording mode, and a voice recognition mode, and may process such sound into audio data. In the phone call mode, the processed audio (voice) data may be converted into a format that can be transmitted to a mobile communication base station via the RF unit 101. The microphone 1042 may implement various types of noise cancellation (or suppression) algorithms to eliminate (or suppress) noise or interference generated during the reception and transmission of audio signals.

[0154] The mobile terminal 100 also includes at least one sensor 105, such as a light sensor, a motion sensor, and other sensors. Optionally, the light sensor includes an ambient light sensor and a proximity sensor. Optionally, the ambient light sensor can adjust the brightness of the display panel 1061 according to the brightness of the ambient light, and the proximity sensor can turn off the display panel 1061 and / or the backlight when the mobile terminal 100 is moved to the ear. As a type of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in all directions (generally three axes), and can detect the magnitude and direction of gravity when stationary. It can be used for applications that recognize the posture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer, tapping), etc.; as for other sensors that can be configured in the mobile phone, such as fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., they will not be described here.

[0155] The display unit 106 is used to display information input by the user or information provided to the user. The display unit 106 may include a display panel 1061, which may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.

[0156] The user input unit 107 can be used to receive input digital or character information and generate key signal input related to user settings and function control of the mobile terminal. Optionally, the user input unit 107 may include a touch panel 1071 and other input devices 1072. The touch panel 1071, also known as a touch screen, can collect user touch operations on or near it (such as operations performed by the user using a finger, stylus, or any other suitable object or accessory on or near the touch panel 1071) and drive corresponding connected devices according to a pre-set program. The touch panel 1071 may include two parts: a touch detection device and a touch controller. Optionally, the touch detection device detects the user's touch direction and detects the signal generated by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device and converts it into touch point coordinates, which are then sent to the processor 110. It can also receive and execute commands sent by the processor 110. And / or, the touch panel 1071 can be implemented using various types such as resistive, capacitive, infrared, and surface acoustic wave. In addition to the touch panel 1071, the user input unit 107 may further include other input devices 1072. Optionally, the other input devices 1072 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, power keys, etc.), a trackball, a mouse, a joystick, etc., and the specifics are not limited here.

[0157] Optionally, the touch panel 1071 may overlay the display panel 1061. When the touch panel 1071 detects a touch operation on or near it, it transmits the information to the processor 110 to determine the type of touch event. The processor 110 then provides a corresponding visual output on the display panel 1061 based on the type of touch event. Although in FIG1 , the touch panel 1071 and the display panel 1061 are shown as two separate components to implement the input and output functions of the mobile terminal, in some embodiments, the touch panel 1071 and the display panel 1061 may be integrated to implement the input and output functions of the mobile terminal, which is not limited to this specific embodiment.

[0158] The interface unit 108 serves as an interface through which at least one external device can be connected to the mobile terminal 100. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device with an identification module, an audio input / output (I / O) port, a video I / O port, a headphone port, etc. The interface unit 108 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the mobile terminal 100 or may be used to transmit data between the mobile terminal 100 and an external device.

[0159] Memory 109 can be used to store software programs and various data. Memory 109 may primarily include a program storage area and a data storage area. Optionally, the program storage area may store an operating system and at least one application required for a function (such as a sound playback function or an image playback function); the data storage area may store data generated based on the use of the mobile phone (such as audio data, a phone book, etc.). Furthermore, / or, memory 109 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0160] Processor 110 is the control center of the mobile terminal, connecting all components of the mobile terminal using various interfaces and circuits. By running or executing software programs and / or modules stored in memory 109 and accessing data stored in memory 109, it executes various functions of the mobile terminal and processes data, thereby providing overall monitoring of the mobile terminal. Processor 110 may include one or more processing units; preferably, processor 110 may integrate an application processor and a modem processor. Optionally, the application processor primarily handles the operating system, user interface, and application programs, while the modem processor primarily handles wireless communications. It is understood that the modem processor may not be integrated into processor 110.

[0161] The mobile terminal 100 may also include a power supply 111 (such as a battery) for supplying power to various components. Preferably, the power supply 111 may be logically connected to the processor 110 through a power management system, thereby managing functions such as charging, discharging, and power consumption through the power management system.

[0162] Although not shown in FIG. 1 , the mobile terminal 100 may further include a Bluetooth module, etc., which will not be described in detail here.

[0163] To facilitate understanding of the embodiments of the present application, the communication network system on which the mobile terminal of the present application is based is described below.

[0164] Please refer to Figure 2, which is a communication network system architecture diagram provided in an embodiment of the present application. The communication network system is an NR (New Radio) system of universal mobile communication technology. The NR system includes UE (User Equipment) 201, E-UTRAN (Evolved UMTS Terrestrial Radio Access Network) 202, EPC (Evolved Packet Core) 203 and the operator's IP service 204, which are connected in sequence.

[0165] Optionally, UE201 may be the above-mentioned terminal device 100, which will not be described in detail here.

[0166] E-UTRAN 202 includes eNodeB 2021 and other eNodeBs 2022 . Optionally, eNodeB 2021 may be connected to other eNodeBs 2022 via a backhaul (eg, an X2 interface). eNodeB 2021 is connected to EPC 203 , and eNodeB 2021 may provide access from UE 201 to EPC 203 .

[0167] EPC 203 may include an MME (Mobility Management Entity) 2031, an HSS (Home Subscriber Server) 2032, other MMEs 2033, an SGW (Serving Gate Way) 2034, a PGW (PDN Gate Way) 2035, and a PCRF (Policy and Charging Rules Function) 2036. Optionally, MME 2031 is a control node that processes signaling between UE 201 and EPC 203, providing bearer and connection management. HSS 2032 provides registers for managing functions such as the Home Location Register (not shown) and stores user-specific information such as service features and data rates. All user data can be sent through SGW2034, PGW2035 can provide IP address allocation and other functions for UE 201, PCRF2036 is the policy and charging control policy decision point for service data flow and IP bearer resources, and it selects and provides available policy and charging control decisions for the policy and charging execution function unit (not shown in the figure).

[0168] The IP service 204 may include the Internet, an intranet, an IMS (IP Multimedia Subsystem), or other IP services.

[0169] Although the above introduction takes the LTE system as an example, those skilled in the art should know that this application is not only applicable to the LTE system, but can also be applied to other wireless communication systems, such as GSM, CDMA2000, WCDMA, TD-SCDMA, 5G and future new network systems (such as 6G), etc., which are not limited here.

[0170] FIG3 is a schematic diagram of the hardware structure of a controller 140 provided in this application. The controller 140 includes a memory 1401 and a processor 1402. The memory 1401 is used to store program instructions, and the processor 1402 is used to call the program instructions in the memory 1401 to execute the steps performed by the controller in the first embodiment of the above method. The implementation principles and beneficial effects are similar and will not be repeated here.

[0171] Optionally, the controller further includes a communication interface 1403, which can be connected to the processor 1402 via a bus 1404. The processor 1402 can control the communication interface 1403 to implement the receiving and sending functions of the controller 140.

[0172] Figure 4 is a schematic diagram of the hardware structure of a network node 150 provided in this application. Network node 150 includes: a memory 1501 and a processor 1502. Memory 1501 is used to store program instructions, and processor 1502 is used to call the program instructions in memory 1501 to execute the steps performed by the first node in the first embodiment of the above method. The implementation principles and beneficial effects are similar and will not be repeated here.

[0173] Optionally, the controller further includes a communication interface 1503, which can be connected to the processor 1502 via a bus 1504. The processor 1502 can control the communication interface 1503 to implement the receiving and sending functions of the network node 150.

[0174] The integrated modules implemented in the form of software function modules can be stored in a computer-readable storage medium. The software function modules stored in a storage medium include a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute some of the steps of the methods of various embodiments of the present application.

[0175] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When software is used for implementation, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. 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 storage medium or transmitted from one storage medium to another storage medium. For example, the computer instructions can be transmitted from a website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state drive solid state disk, SSD), etc.

[0176] Based on the above-mentioned mobile terminal hardware structure and communication network system, various embodiments of the present application are proposed.

[0177] First embodiment

[0178] 5 , which is a flow chart of a handover method according to a first embodiment, the handover method of the present embodiment can be applied to at least one secondary node, and includes the following steps:

[0179] S2: Execute LTM switching of the secondary node based on the interactive signaling between the primary node and the secondary node.

[0180] Optionally, LTM (L1 / L2 Triggered Mobility) handover between different central units may be initiated by a SN (Secondary Node) or a MN (Master Node).

[0181] Optionally, for LTM switching of different central units SCG (Secondary Cell Group) initiated by SN, the interaction of SCG LTM configuration information of different central units can be achieved by enhancing the existing Xn interface interaction signaling between base stations; new Xn interface interaction signaling between base stations can also be introduced to achieve interaction of at least one of the SCG LTM configuration information, advance uplink synchronization information and subsequent secondary node information of different central units.

[0182] Optionally, for the switching of different central units SCG LTM initiated by the MN, the interaction of configuration information of different central units SCG LTM can be achieved by enhancing the existing Xn interface interaction signaling between base stations.

[0183] Optionally, the Xn interface interaction signaling between base stations includes interaction signaling between a master node and a secondary node.

[0184] Optionally, the interactive signaling between the primary node and the secondary node includes at least one of secondary node change request signaling, secondary node change request confirmation signaling, secondary node change requirement signaling, secondary node change requirement determination signaling, and secondary node LTM requirement determination signaling.

[0185] Optionally, the secondary node change request signaling includes at least one of a secondary node add request (SN Addition Request), a secondary node modification request (SN Modification Request), a secondary node release request (SN Release Request) and a secondary node LTM request (SCG LTM Request).

[0186] Optionally, the secondary node change request confirmation signaling includes secondary node addition request confirmation (SN Addition Request Acknowledge), secondary node modification request confirmation (SN Modification Request Acknowledge), secondary node release request confirmation (SN Release Request Acknowledge) and secondary node LTM request confirmation (SCG LTM Request Acknowledge).

[0187] Optionally, the secondary node includes a source secondary node and / or a candidate secondary node.

[0188] In the technical solution of this embodiment, the LTM switching mechanism of the secondary node is improved by executing the LTM switching of the secondary node based on the interactive signaling between the primary node and the secondary node, so that the LTM switching mode not only supports continuous switching under the same central unit, but also supports switching between different central units, thereby improving the applicability and / or diversity of LTM switching.

[0189] Second embodiment

[0190] 6 , which is a schematic diagram of an interaction sequence according to a second embodiment, based on the first embodiment of the present application, this embodiment further discloses a specific process of switching between different central units SCG LTM initiated by a secondary node.

[0191] Optionally, the source secondary node sends a secondary node modification requirement signaling (SN Modification Required) to the primary node.

[0192] Optionally, the secondary node change requirement signaling is used to initiate secondary node LTM configuration information.

[0193] Optionally, the secondary node change requirement signaling carries at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, and a layer 1 measurement event.

[0194] Optionally, in this embodiment, the secondary node change requirement signaling can be existing signaling. By enhancing the existing signaling to carry LTM switching configuration parameters, the complexity of signaling processing can be reduced, for example, it can be used to provide the primary node LTM switching configuration parameters, determine it as a secondary cell group LTM switching request initiated by the secondary node, and trigger and / or instruct the primary node's subsequent processing mechanism.

[0195] Optionally, the secondary node change requirement signaling can also be a newly introduced signaling, such as: secondary cell group LTM request confirmation (SCG LTM Request Required). By introducing new signaling, the information function can be distinguished and / or clarified, the complexity of signaling processing can be reduced, and / or, the signaling overhead and / or redundant information can be reduced. For example: when the main node receives the secondary cell group LTM request confirmation, it can clearly identify its function as the SCG LTM switch initiated by the secondary node.

[0196] Optionally, the radio resource control configuration includes a central unit identifier and / or a candidate cell configuration.

[0197] Optionally, the secondary node change requirement signaling and / or the secondary node LTM request confirmation signaling carries the central unit identifier.

[0198] Optionally, the central unit identifier is a central unit identifier of a secondary node serving cell.

[0199] Optionally, the central unit identifier is used to determine whether it is a LTM handover between different central units and / or a LTM handover between different central units SCG.

[0200] Optionally, after receiving the secondary node modification request signaling sent by the source secondary node, the primary node initiates a secondary node modification request process and sends a secondary node modification request (SN Modification Request) signaling to at least one candidate secondary node.

[0201] Optionally, at least one candidate secondary node receives a secondary node change request signaling sent by the primary node.

[0202] Optionally, the source secondary node and at least one candidate secondary node are secondary nodes of different central units (Inter-CU) and / or different base stations (Inter-gNB).

[0203] Optionally, secondary node change request signaling is used to provide candidate secondary node LTM configuration.

[0204] Optionally, the secondary node change request signaling includes at least one of a target candidate cell identifier, a candidate cell LTM configuration identifier, an LTM configuration identifier comparison list, and a request for channel state indication (CSI) resource configuration.

[0205] Optionally, the secondary node change request signaling may also be a newly introduced signaling, such as a secondary cell group (SCG) LTM request (SCG LTM Request) signaling.

[0206] Optionally, the secondary node change request signaling may further carry a request central unit identification indication, which is used to request a candidate secondary node central unit identification indication.

[0207] Optionally, the secondary node change request signaling may further carry a central unit identifier and / or a central unit identifier mapping list (mapping list) for providing the secondary node central unit identifier.

[0208] Optionally, the secondary node change request signaling is used to request at least one candidate cell configuration in the target secondary node, including: candidate cell LTM configuration and / or secondary cell group LTM configuration.

[0209] Optionally, the central unit identifier is used to determine whether it is a LTM handover between different central units and / or a LTM handover between different central units SCG.

[0210] Optionally, the secondary node change request signaling may also be at least one of a secondary node modification request, a secondary node addition request (SN Addition Request), and a secondary node release request (SN Release Request).

[0211] Optionally, at least one secondary node responds to the secondary node modification request signaling sent by the primary node and sends a secondary node modification request confirmation signaling (SN Modification Request Acknowledge) to the primary node.

[0212] Optionally, the secondary node change request confirmation signaling includes at least one of random access configuration, TCI state configuration, channel state indication configuration, radio resource control configuration, layer 1 measurement event and channel state indication reporting configuration.

[0213] Optionally, the secondary cell group LTM request confirmation signaling may also be a newly introduced signaling, such as a secondary cell group LTM request confirmation (SCG LTM Request Acknowledge) signaling.

[0214] Optionally, the radio resource configuration further includes a central unit identifier and / or candidate cell configuration.

[0215] Optionally, the secondary node change request confirmation signaling further carries a central unit identifier, which is used to provide a candidate secondary node central unit identifier.

[0216] Optionally, the secondary node change request confirmation signaling is used to provide at least one candidate cell configuration in the target secondary node, including: LTM configuration and / or secondary cell group LTM configuration.

[0217] Optionally, the secondary node change request confirmation signaling may also be at least one of a secondary node modification request confirmation, a secondary node addition request confirmation (SN Addition Request Acknowledge), and a secondary node release request confirmation (SN Release Request Acknowledge).

[0218] Optionally, the primary node sends a secondary node change request signaling to the candidate secondary node and / or the source secondary node.

[0219] Optionally, the secondary node change request signaling carries other candidate secondary node configuration information, including at least one of random access configuration, TCI state configuration, channel state indication configuration, radio resource control configuration, layer 1 measurement event, and channel state indication reporting configuration.

[0220] Optionally, the secondary node change request signaling may also be at least one of a secondary node add request, a secondary node modify request, a secondary node release request, and a secondary cell group LTM request.

[0221] Optionally, the secondary node change request signaling may also carry a central unit identifier, which is used to provide central unit identifiers of other candidate secondary nodes.

[0222] Optionally, the source secondary node and / or the candidate secondary node sends response signaling to the primary node. Optionally, the response signaling carries updated configuration information of the source secondary node and / or the candidate secondary node, including at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, a layer 1 measurement event, and a channel state indication reporting configuration. Optionally, the response signaling may also be at least one of a secondary node add request confirmation, a secondary node modify request confirmation, a secondary node release request confirmation, and a secondary cell group LTM request confirmation.

[0223] In the technical solution of this embodiment, the source secondary node sends the secondary node change request signaling to the primary node; the candidate secondary node receives the secondary node change request signaling sent by the primary node, and sends the secondary node change request confirmation signaling to the primary node to realize the SCG LTM switching between different central units initiated by the secondary node; the existing signaling can be enhanced to carry the request LTM switching configuration parameters to reduce the complexity of signaling processing, and new signaling can be introduced to distinguish and / or clarify information functions, reduce signaling processing complexity, and / or reduce signaling overhead and / or redundant information.

[0224] Third embodiment

[0225] On the basis of any of the foregoing embodiments of the present application, this embodiment further discloses the switching method in the foregoing embodiments, and specifically discloses a solution for performing radio resource control reconfiguration.

[0226] Optionally, after receiving the secondary node change request confirmation signaling sent by at least one secondary node, the primary node may initiate a radio resource control reconfiguration process and send a radio resource control reconfiguration (RRCReconfiguration) signaling to the terminal device.

[0227] Optionally, the radio resource control reconfiguration signaling includes at least one of candidate cell configuration, reference configuration, TCI status configuration, channel state indication configuration, layer 1 measurement event, early uplink synchronization configuration, channel state indication reporting configuration and auxiliary node serving cell center unit identifier.

[0228] Optionally, the radio resource reconfiguration further includes central unit identification information.

[0229] Optionally, the candidate cell configuration further includes central unit identification information.

[0230] Optionally, the central unit identifier may be configured in the candidate cell configuration.

[0231] Optionally, the master node initiates radio resource control reconfiguration after completing acquisition of configuration of the candidate secondary node and / or the source secondary node.

[0232] Optionally, the candidate cell configuration may be a complete radio resource control configuration (Complete configuration) or a differential radio resource control configuration (Delta configuration).

[0233] Optionally, the candidate cell configuration is associated via a candidate cell identifier.

[0234] Optionally, the early uplink synchronization configuration includes a target candidate cell random access configuration.

[0235] Optionally, the radio resource control reconfiguration includes: different central unit LTM switching configurations and / or different central unit SCG LTM switching configurations.

[0236] Optionally, the central unit identifier is used to determine whether it is a LTM handover between different central units and / or a LTM handover between different central units SCG.

[0237] Optionally, the terminal device sends a radio resource control reconfiguration complete (RRCReconfiguration Complete) signaling to the master node to complete the LTM switching configuration.

[0238] Optionally, the radio resource control reconfiguration completion signaling includes: responding to completion of LTM switching configuration between different central units and / or responding to completion of LTM switching configuration between different central units SCG.

[0239] Optionally, the master node receives the radio resource control reconfiguration completion signaling reported by the terminal device, and sends a secondary node modification requirement confirmation (SN Modification Confirm) signaling to the source secondary node.

[0240] Optionally, the secondary node change request confirmation signaling may be a newly introduced signaling, such as the secondary node LTM request confirmation (SCG LTM Request Confirm) signaling. By introducing this new signaling, the function of the information can be differentiated and / or clarified, reducing signaling processing complexity and / or signaling overhead and / or redundant information. For example, the primary node can provide feedback indicating that the SCG LTM handover configuration is complete.

[0241] Optionally, the secondary node change requirement determination signaling further carries different central unit LTM handover configurations, including: candidate LTM handover configurations and / or candidate secondary cell group LTM handover configurations.

[0242] Optionally, the secondary node change requirement determination signaling carries at least one of a candidate cell identifier, a candidate cell LTM configuration identifier, an LTM configuration identifier comparison list, a candidate cell channel state indication reporting configuration, and a radio resource control reconfiguration completion.

[0243] In the technical solution of this embodiment, the wireless resource control reconfiguration signaling is sent to the terminal device by the main node, so that the terminal device completes the LTM switching configuration, and then the main node sends the auxiliary node change requirement determination signaling to the source auxiliary node. The SCG LTM switching between different central units can be achieved by enhancing the existing signaling and / or introducing new signaling.

[0244] Fourth embodiment

[0245] On the basis of any of the foregoing embodiments of the present application, this embodiment further discloses the switching method in the foregoing embodiments, and specifically discloses a solution for performing early downlink synchronization.

[0246] Optionally, the terminal device performs early downlink synchronization of the candidate cell according to the LTM cell switching configuration, including: performing target cell measurement according to TCI status information, and / or performing target cell measurement according to layer 1 measurement configuration.

[0247] Optionally, the source secondary node may require the terminal device to perform an early uplink synchronization indication, and trigger the terminal device to send a random access preamble by sending downlink control information (DCI).

[0248] Optionally, the source secondary node may trigger the terminal device to perform early uplink synchronization on at least one target candidate cell.

[0249] Optionally, the downlink control information carries candidate cell identification information.

[0250] Optionally, if the terminal device receives an early uplink synchronization indication sent by the source secondary node, it sends a random access preamble (Preamble) according to the indicated target candidate cell.

[0251] Optionally, the terminal device determines the target cell to which the random access preamble is to be sent based on the candidate cell identification information, for example, by indexing the LTM switching configuration through the candidate cell identification and confirming the early uplink synchronization configuration.

[0252] Optionally, the target candidate cell receives the random access preamble sent by the terminal device, calculates the time advance information, and sends feedback information to the primary node through the secondary node.

[0253] Optionally, the timing advance information is carried in master node-secondary node timing advance information transmission signaling and / or inter-base station timing advance information transmission signaling.

[0254] Optionally, the secondary node may carry the time advance information through the existing signaling exchanged between the secondary node and the primary node, including at least one of a secondary node addition request confirmation (SN Addition Request Acknowledge), a secondary node modification request confirmation (SN Modification Request Acknowledge), a secondary node release request confirmation (SN Release Request Acknowledge), and a radio resource control transfer (RRC Transfer). By enhancing the existing signaling for carrying advance uplink synchronization parameters (e.g., time advance information), the complexity of signaling processing may be reduced. For example, when the primary node receives the response information of the target candidate secondary node and carries the time advance information, it may be known that the source secondary node triggers the terminal device to perform uplink synchronization, and / or, a new information field (IE, Information Element) may be added to the signaling to carry the time advance information, thereby reducing the complexity of signaling design.

[0255] Optionally, the secondary node can also carry time advance information through new secondary node-primary node interaction signaling, such as: secondary node-primary node time advance information transfer (SN-MN TA Information Transfer) signaling, inter-base station time advance information transfer (gNB TA Information Transfer) signaling, and secondary cell group LTM request confirmation (SCG LTM Request Acknowledge) signaling, etc. The names of the signaling are not specifically limited in this embodiment.

[0256] Optionally, the secondary node-to-primary node timing advance information transmission signaling further carries secondary node identification information.

[0257] Optionally, the secondary node identification information is used to help the primary node and / or the secondary node identify the secondary node that has successfully performed early uplink synchronization.

[0258] By introducing new signaling for interaction between the auxiliary node and the main node, the information transmission function is distinguished and / or clarified, the complexity of signaling processing is reduced, and / or the signaling overhead and / or redundant information is reduced. For example: when the main node receives this signaling, it can clearly identify its function as the response information of the auxiliary cell triggering early uplink synchronization, and immediately execute forwarding.

[0259] Optionally, the master node forwards the feedback information received from the candidate slave node to the source slave node, and the signaling used for forwarding can be the master node and slave node interaction signaling in the existing signaling, such as: slave node addition request (SN Addition Request), slave node modification request (SN Modification Request), slave node release request (SN Release Request) and radio resource control transfer (RRC Transfer), etc.

[0260] Optionally, the master node forwards the feedback information received from the candidate secondary node to the source secondary node. The signaling used for forwarding may also be new master node-secondary node interaction signaling, such as: master node-secondary node time advance information transfer (MN-SN TA Information Transfer) signaling, base station time advance information transfer (gNB TA Information Transfer) signaling, and secondary cell group LTM request (SCG LTM Request) signaling, etc. The above signaling carries the candidate cell time advance information in the feedback information sent by the candidate secondary node to the master node and / or carries the secondary node identifier.

[0261] In the technical solution of this embodiment, the source auxiliary node sends downlink control information to trigger the terminal device to perform early uplink synchronization on at least one target candidate cell; the candidate auxiliary node can enhance the existing signaling and / or introduce new signaling so that the main node receives the time advance information and / or auxiliary node identification and forwards it to the source auxiliary node, which is then used to realize SCG LTM switching between different central units.

[0262] Fifth embodiment

[0263] Based on any of the foregoing embodiments of the present application, this embodiment further discloses the switching method in the foregoing embodiments, and specifically discloses a solution for performing LTM switching.

[0264] Optionally, the terminal device performs layer 1 measurement reporting.

[0265] Optionally, the terminal device reports the measurement result according to the reporting configuration and / or reports the measurement result according to the measurement event.

[0266] Optionally, when the candidate cell and / or the serving cell meets a measurement event, measurement reporting is triggered.

[0267] Optionally, the source secondary node sends a cell switch command (Cell Switch Command) to trigger the terminal device to perform LTM switching.

[0268] Optionally, the terminal device performs LTM switching between different central units and / or LTM switching between different central units SCG according to the cell switching command.

[0269] Optionally, the cell switching command carries at least one of the target candidate cell time advance information, the candidate cell configuration identifier (Candidate configuration index), and the candidate cell random access parameter.

[0270] Optionally, the timing advance information belongs to cells of different central unit secondary nodes.

[0271] Optionally, the cell switching command is sent via a MAC Control Element (MAC Control Element).

[0272] Optionally, the terminal device determines whether to switch to a different central unit based on the central unit identifier of the secondary node serving cell and the central unit identifier of the candidate cell.

[0273] Optionally, the source secondary node sends a cell switching notification signaling to inform the primary node to perform secondary cell group switching.

[0274] Optionally, the cell handover notification signaling is carried in the secondary node-primary node cell handover notification signaling.

[0275] Optionally, the cell handover notification signaling may be existing signaling, including at least one of secondary node modification requirement, secondary node modification request confirmation, secondary node addition request confirmation, secondary node release request confirmation, radio resource control transfer, and secondary cell group LTM request confirmation.

[0276] Optionally, the cell switch notification signaling may also be a newly introduced signaling, such as SN-MN Cell Switch Notification, which is not specifically limited in this embodiment.

[0277] Optionally, the cell switching notification signaling carries candidate secondary node and / or target secondary node information, including at least one of a secondary node identifier, a candidate cell identifier (Candidate Cell Identity), a cell identifier (Cell Identity), a central unit identifier (CU-ID), and a candidate configuration identifier (Candidate Config Identity).

[0278] Optionally, the candidate secondary node and / or target secondary node information is used to instruct the primary node to forward the first uplink data sent by the terminal device to the candidate secondary node, and / or forward uplink information delivery multiple radio dual links (ULInformationTransferMRDC) to the candidate secondary node.

[0279] Optionally, the uplink information delivery multiple radio dual links carries radio resource control reconfiguration completion information.

[0280] In the technical solution of this embodiment, the source auxiliary node actively notifies the main node of the candidate auxiliary node information for executing the secondary cell group LTM switching, helping the main node to forward the first uplink data and / or wireless resource control reconfiguration completion information sent by the terminal device after the switching is completed, so as to avoid the main node not knowing the auxiliary node to which the terminal device is about to switch, resulting in LTM switching failure and / or inability to execute data forwarding (Data Forwarding) causing data interaction delay.

[0281] Sixth embodiment

[0282] Based on any of the foregoing embodiments of the present application, this embodiment further discloses the switching method in the foregoing embodiments, and specifically further discloses a solution for performing LTM switching.

[0283] Optionally, the primary node sends a cell switching notification signaling to the candidate secondary node to inform the candidate secondary node to perform secondary cell group switching.

[0284] Optionally, the cell switching notification signaling may be existing signaling, including at least one of secondary node modification requirement, secondary node modification request confirmation, secondary node addition request confirmation, secondary node release request confirmation, radio resource control transfer, and secondary cell group LTM request confirmation.

[0285] Optionally, the cell switch notification signaling may also be a newly introduced signaling, such as MN-SN Cell Switch Notification, which is not specifically limited in this embodiment.

[0286] Optionally, the cell switching notification signaling carries candidate secondary node and / or target secondary node information, including at least one of a secondary node identifier, a candidate cell identifier (Candidate Cell Identity), a cell identifier (Cell Identity), a central unit identifier (CU-ID), and a candidate configuration identifier (Candidate Config Identity).

[0287] Optionally, the candidate secondary node and / or target secondary node information is used to instruct the primary node to forward the first uplink data sent by the terminal device to the candidate secondary node, and / or forward uplink information delivery multiple radio dual links (ULInformationTransferMRDC) to the candidate secondary node.

[0288] Optionally, the uplink information delivery multiple radio dual links carries radio resource control reconfiguration completion information.

[0289] Optionally, after the terminal device receives the cell switching command sent by the source secondary node, if there is no time advance information of the candidate cell, the random access process is performed.

[0290] Optionally, the terminal device performs a random access procedure with the target candidate cell based on the random access parameters carried in the cell switching command.

[0291] Optionally, the terminal device sends cell switching completion information and / or the first uplink data to the master node.

[0292] Optionally, the cell handover completion information may be uplink information transfer multiple radio dual links (UL Information Transfer MRDC) and / or radio resource control reconfiguration complete signaling.

[0293] Optionally, the cell switching completion information is used to indicate that the LTM switching of the secondary cell group is completed.

[0294] Optionally, the uplink information delivery multiple radio dual-link signaling further carries at least one of a secondary node identifier, a candidate cell identifier (Candidate Cell Identity), a cell identifier (Cell Identity), a central unit identifier (CU-ID), and a candidate configuration identifier (Candidate Config Identity).

[0295] Optionally, in a random access-free (RACH-Less) scenario, if the terminal device has executed the early uplink synchronization process and sent the first uplink data and / or wireless resource control reconfiguration signaling according to the time advance information carried by the cell switching command, and receives new downlink and / or uplink scheduling from the candidate cell, the cell switching is deemed to be completed.

[0296] Optionally, if the terminal device receives a cell switching command and performs a random access procedure, the cell switching is deemed to be completed when the random access procedure is successfully completed.

[0297] Optionally, after the cell handover is completed, the candidate cell is regarded as the serving cell.

[0298] In the technical solution of this embodiment, by enhancing the existing signaling and / or introducing new interactive signaling between the primary node and the secondary node, it is used to indicate the target secondary node for the primary node to execute the secondary cell LTM switching, and / or, the target secondary node information is carried in the wireless resource reconfiguration completion signaling to inform the candidate secondary node to execute the secondary cell group switching.

[0299] Seventh embodiment

[0300] Based on any of the foregoing embodiments of the present application, this embodiment further discloses the switching method in the foregoing embodiments, and specifically further discloses a solution for performing LTM switching.

[0301] Optionally, the primary node forwards the cell switching completion information and / or the first uplink data to the target secondary node.

[0302] Optionally, the primary node selects or determines the target secondary node from the candidate secondary nodes in the following manner:

[0303] Method 1: The primary node determines the target secondary node based on the information provided by the source secondary node;

[0304] Optionally, the master node determines the target secondary node through the target secondary node information provided in the cell switching notification signaling sent by the source secondary node, and forwards the uplink data and / or radio resource control reconfiguration completion signaling sent by the terminal device to the target secondary node.

[0305] Optionally, the source secondary node sends a cell switching notification signaling to inform the primary node to perform secondary cell group switching.

[0306] Optionally, the cell handover notification signaling is carried in the secondary node-primary node cell handover notification signaling.

[0307] Optionally, the cell handover notification signaling may be existing signaling, including at least one of secondary node modification requirement, secondary node modification request confirmation, secondary node addition request confirmation, secondary node release request confirmation, radio resource control transfer, and secondary cell group LTM request confirmation.

[0308] Optionally, the cell switch notification signaling may also be a newly introduced signaling, such as SN-MN Cell Switch Notification, which is not specifically limited in this embodiment.

[0309] Optionally, the cell switching notification signaling carries candidate secondary node and / or target secondary node information, including at least one of a secondary node identifier, a candidate cell identifier (Candidate Cell Identity), a cell identifier (Cell Identity), a central unit identifier (CU-ID), and a candidate configuration identifier (Candidate Config Identity).

[0310] Optionally, the candidate secondary node and / or target secondary node information is used to instruct the primary node to forward the first uplink data sent by the terminal device to the candidate secondary node, and / or forward uplink information delivery multiple radio dual links (ULInformationTransferMRDC) to the candidate secondary node.

[0311] Optionally, the uplink information delivery multiple radio dual links carries radio resource control reconfiguration completion information.

[0312] Method 2: The master node determines the target slave node based on the information provided by the terminal device.

[0313] Optionally, the master node determines the target secondary node by delivering multiple wireless dual-link signaling and / or target secondary node information provided in the wireless resource control reconfiguration completion signaling through uplink information, and forwards the uplink data and / or wireless resource control reconfiguration completion signaling sent by the terminal device to the target secondary node.

[0314] Optionally, the terminal device sends uplink data and / or receives new downlink data based on the time advance information.

[0315] Optionally, the terminal device sends uplink data based on the time advance information.

[0316] Optionally, the uplink data is the first uplink data.

[0317] Optionally, after the terminal device switches to a target secondary node among the candidate secondary nodes, it may perform continuous LTM switching to other candidate secondary nodes.

[0318] Optionally, other candidate secondary nodes may be candidate secondary nodes other than the target secondary node, or may be the primary node in the aforementioned embodiment.

[0319] In the technical solution of this embodiment, the terminal device actively notifies the main node of the candidate secondary node information for executing the secondary cell group LTM switching, helps the main node determine the target secondary node, and forwards the first uplink data and / or wireless resource control reconfiguration completion information sent by the terminal device after completing the switching to the target secondary node, so as to avoid the main node not knowing the secondary node to which the terminal device is about to switch, resulting in LTM switching failure and / or inability to execute data forwarding, causing data interaction delay; and / or, clarifies the LTM switching process of the secondary nodes of different central units and / or the LTM switching process of different central units SCG, and / or, enhances the existing signaling and / or introduces new interactive signaling to meet the switching requirements of different central units.

[0320] Eighth embodiment

[0321] 7 , which is a schematic diagram of an interaction sequence according to an eighth embodiment, based on the first embodiment of the present application, this embodiment further discloses a specific process of switching between different central units SCG LTM initiated by a master node.

[0322] Optionally, the primary node initiates a secondary node modification request process and sends a secondary node modification request (SN Modification Request) signaling to at least one candidate secondary node.

[0323] Optionally, at least one candidate secondary node receives a secondary node change request signaling sent by the primary node.

[0324] Optionally, the source secondary node and at least one candidate secondary node are secondary nodes of different central units (Inter-CU) and / or different base stations (Inter-gNB).

[0325] Optionally, secondary node change request signaling is used to provide candidate secondary node LTM configuration.

[0326] Optionally, the secondary node change request signaling includes at least one of a target candidate cell identifier, a candidate cell LTM configuration identifier, an LTM configuration identifier comparison list, and a request for channel state indication (CSI) resource configuration.

[0327] Optionally, the secondary node change request signaling may also be a newly introduced signaling, such as a secondary cell group (SCG) LTM request (SCG LTM Request) signaling.

[0328] Optionally, the secondary node change request signaling may further carry a request central unit identification indication, which is used to request a candidate secondary node central unit identification indication.

[0329] Optionally, the secondary node change request signaling may further carry a central unit identifier and / or a central unit identifier mapping list (mapping list) for providing the secondary node central unit identifier.

[0330] Optionally, the secondary node change request signaling is used to request at least one candidate cell configuration in the target secondary node, including: candidate cell LTM configuration and / or secondary cell group LTM configuration.

[0331] Optionally, the central unit identifier is used to determine whether it is a LTM handover between different central units and / or a LTM handover between different central units SCG.

[0332] Optionally, the secondary node change request signaling includes at least one of a secondary node modification request, a secondary node addition request (SN Addition Request), and a secondary node release request (SN Release Request).

[0333] Optionally, at least one secondary node responds to the secondary node modification request signaling sent by the primary node and sends a secondary node modification request confirmation signaling (SN Modification Request Acknowledge) to the primary node.

[0334] Optionally, the secondary node change request confirmation signaling includes at least one of random access configuration, TCI state configuration, channel state indication configuration, radio resource control configuration, layer 1 measurement event and channel state indication reporting configuration.

[0335] Optionally, the secondary cell group LTM request confirmation signaling may also be a newly introduced signaling, such as a secondary cell group LTM request confirmation (SCG LTM Request Acknowledge) signaling.

[0336] Optionally, the radio resource configuration further includes a central unit identifier and / or candidate cell configuration.

[0337] Optionally, the secondary node change request confirmation signaling further carries a central unit identifier, which is used to provide a candidate secondary node central unit identifier.

[0338] Optionally, the secondary node change request confirmation signaling is used to provide at least one candidate cell configuration in the target secondary node, including: LTM configuration and / or secondary cell group LTM configuration.

[0339] Optionally, the secondary node change request confirmation signaling includes at least one of a secondary node modification request confirmation, a secondary node addition request confirmation (SN Addition Request Acknowledge), and a secondary node release request confirmation (SN Release Request Acknowledge).

[0340] Optionally, the primary node sends a secondary node change request signaling to the source secondary node.

[0341] Optionally, the secondary node change request signaling can be an existing signaling, used to carry the collected candidate secondary node configuration information, including the target candidate cell identifier, the candidate cell LTM configuration identifier, the LTM configuration identifier comparison list, the random access configuration, the TCI status configuration, the channel status indication configuration, the wireless resource control configuration, the layer one measurement event and at least one of the channel status indication reporting configuration.

[0342] By enhancing existing signaling to carry request LTM switching configuration parameters, the complexity of signaling processing can be reduced. For example, when the primary node carries identification information and request configuration parameters through enhanced signaling, the secondary node determines the purpose of the request signaling by carrying the content and prepares the subsequent processing mechanism.

[0343] Optionally, the secondary node change request signaling may also be a newly introduced signaling, for example, a secondary cell group (SCG) LTM request, ie, SCG LTM Request.

[0344] By introducing new signaling, differentiating and / or clarifying information transmission functions, signaling processing complexity is reduced, and / or signaling overhead and / or redundant information is reduced. For example, when the target secondary node receives this signaling, it can clearly identify its function as requesting to provide secondary cell LTM switching configuration.

[0345] Optionally, the secondary node change request signaling may further carry a central unit identifier and / or a central unit identifier mapping list (mapping list) for providing the secondary node central unit identifier.

[0346] Optionally, the secondary node change request signaling may also be at least one of a secondary node add request, a secondary node modify request, a secondary node release request, and a secondary cell group LTM request.

[0347] Optionally, the source slave node sends a response signaling to the master node.

[0348] Optionally, the response signaling is a secondary node change request confirmation signaling.

[0349] Optionally, the secondary node change request confirmation signaling carries updated configuration information of the source secondary node and / or candidate secondary node, including at least one of random access configuration, TCI state configuration, channel state indication configuration, radio resource control configuration and layer 1 measurement event.

[0350] Optionally, the radio resource control configuration further includes a secondary node serving cell center unit identifier and / or candidate cell configuration.

[0351] Optionally, the secondary node change request confirmation signaling may be an existing signaling, including at least one of a secondary node add request confirmation, a secondary node modify request confirmation, a secondary node release request confirmation, and a secondary cell group LTM request confirmation.

[0352] Optionally, the secondary cell group LTM request confirmation signaling may also be a newly introduced signaling, such as: secondary cell group LTM request confirmation (SCG LTM Request Acknowledge).

[0353] Optionally, the secondary node change request confirmation signaling may further carry a central unit identifier, which is used to provide a candidate secondary node central unit identifier.

[0354] Optionally, the secondary node change request confirmation signaling is used to provide at least one candidate cell configuration in the target secondary node, including: LTM configuration and / or secondary cell group LTM configuration.

[0355] Optionally, the primary node sends a secondary node change request signaling to the candidate secondary node.

[0356] Optionally, the secondary node change request signaling carries other candidate secondary node configuration information, including at least one of random access configuration, TCI state configuration, channel state indication configuration, radio resource control configuration, and layer 1 measurement event.

[0357] Optionally, the secondary node change request signaling may also be at least one of a secondary node add request, a secondary node modify request, a secondary node release request, and a secondary cell group LTM request.

[0358] Optionally, the secondary node change request signaling may also carry a central unit identifier, which is used to provide central unit identifiers of other candidate secondary nodes.

[0359] Optionally, the candidate secondary node sends a response signaling to the primary node. Optionally, the response signaling carries updated candidate secondary node configuration information, including at least one of random access configuration, TCI state configuration, channel state indication configuration, wireless resource control configuration, and layer 1 measurement event.

[0360] Optionally, the response signaling is a secondary node change request confirmation signaling.

[0361] Optionally, the secondary node change request confirmation signaling may be an existing signaling, including at least one of a secondary node add request confirmation, a secondary node modify request confirmation, a secondary node release request confirmation, and a secondary cell group LTM request confirmation.

[0362] Optionally, the secondary cell group LTM request confirmation signaling may also be a newly introduced signaling, such as: secondary cell group LTM request confirmation (SCG LTM Request Acknowledge).

[0363] Optionally, in other embodiments, the master node may first send a secondary node change request signaling to the source secondary node, and then send a secondary node change request signaling to the candidate secondary node. This embodiment does not constitute a limitation on the order in which the secondary node change request signaling is sent to the source secondary node and the candidate secondary node.

[0364] In the technical solution of this embodiment, the master node sends a slave node change request signaling to the source slave node and the candidate slave node to realize the SCG LTM switching between different central units initiated by the master node; the existing signaling can be enhanced to carry the request LTM switching configuration parameters to reduce the complexity of signaling processing; and new signaling can be introduced to distinguish and / or clarify information functions, thereby reducing the complexity of signaling processing and / or reducing signaling overhead and / or redundant information.

[0365] Ninth embodiment

[0366] On the basis of any of the foregoing embodiments of the present application, this embodiment further discloses the switching method in the foregoing embodiments, and specifically discloses a solution for performing radio resource control reconfiguration.

[0367] Optionally, after receiving the secondary node change request confirmation signaling sent by at least one secondary node, the primary node may initiate a radio resource control reconfiguration process and send a radio resource control reconfiguration (RRCReconfiguration) signaling to the terminal device.

[0368] Optionally, the radio resource control reconfiguration signaling includes at least one of candidate cell configuration, reference configuration, TCI status configuration, channel state indication configuration, layer 1 measurement event, early uplink synchronization configuration, channel state indication reporting configuration and auxiliary node serving cell center unit identifier.

[0369] Optionally, the radio resource reconfiguration further includes central unit identification information.

[0370] Optionally, the candidate cell configuration further includes central unit identification information.

[0371] Optionally, the central unit identifier may be configured in the candidate cell configuration.

[0372] Optionally, the master node initiates radio resource control reconfiguration after completing acquisition of configuration of the candidate secondary node and / or the source secondary node.

[0373] Optionally, the candidate cell configuration may be a complete radio resource control configuration or a differential radio resource control configuration.

[0374] Optionally, the candidate cell configuration is associated via a candidate cell identifier.

[0375] Optionally, the early uplink synchronization configuration includes a target candidate cell random access configuration.

[0376] Optionally, the radio resource control reconfiguration includes: different central unit LTM switching configurations and / or different central unit SCG LTM switching configurations.

[0377] Optionally, the central unit identifier is used to determine whether it is a LTM handover between different central units and / or a LTM handover between different central units SCG.

[0378] Optionally, the terminal device sends a radio resource control reconfiguration complete (RRCReconfiguration Complete) signaling to the master node to complete the LTM switching configuration.

[0379] Optionally, the radio resource control reconfiguration completion signaling includes: responding to completion of LTM switching configuration between different central units and / or responding to completion of LTM switching configuration between different central units SCG.

[0380] In the technical solution of this embodiment, the wireless resource control reconfiguration signaling is sent to the terminal device through the main node, so that the terminal device completes the LTM switching configuration, and is then used to realize SCG LTM switching between different central units by enhancing existing signaling and / or introducing new signaling.

[0381] Tenth embodiment

[0382] On the basis of any of the foregoing embodiments of the present application, this embodiment further discloses the switching method in the foregoing embodiments, and specifically discloses a solution for performing early downlink synchronization.

[0383] Optionally, the terminal device performs early downlink synchronization of the candidate cell according to the LTM cell switching configuration, including: performing target cell measurement according to TCI status information, and / or performing target cell measurement according to layer 1 measurement configuration.

[0384] Optionally, the source secondary node may require the terminal device to perform an early uplink synchronization indication, and trigger the terminal device to send a random access preamble by sending downlink control information.

[0385] Optionally, the source secondary node may trigger the terminal device to perform early uplink synchronization on at least one target candidate cell.

[0386] Optionally, the downlink control information carries candidate cell identification information.

[0387] Optionally, if the terminal device receives an early uplink synchronization indication sent by the source secondary node, it sends a random access preamble according to the indicated target candidate cell.

[0388] Optionally, the terminal device determines the target cell to which the random access preamble is to be sent based on the candidate cell identification information, for example, by indexing the LTM switching configuration through the candidate cell identification and confirming the early uplink synchronization configuration.

[0389] Optionally, the target candidate cell receives the random access preamble sent by the terminal device, calculates the time advance information, and sends feedback information to the primary node through the secondary node.

[0390] Optionally, the timing advance information is carried in master node-secondary node timing advance information transmission signaling and / or inter-base station timing advance information transmission signaling.

[0391] Optionally, the secondary node may carry time advance information through existing signaling between the secondary node and the primary node, including at least one of secondary node addition request confirmation, secondary node modification request confirmation, secondary node release request confirmation, and wireless resource control transmission. By enhancing the existing signaling for carrying advance uplink synchronization parameters (e.g., time advance information), the complexity of signaling processing can be reduced. For example, when the primary node receives the response information of the target candidate secondary node and carries the time advance information, it can be known that the source secondary node triggers the terminal device to perform uplink synchronization.

[0392] Optionally, the secondary node can also carry time advance information through new secondary node and primary node interaction signaling, such as: secondary node-primary node time advance information transmission signaling, inter-base station time advance information transmission signaling, and secondary cell group LTM request confirmation signaling, etc. In this embodiment, the name of each signaling does not constitute a specific limitation.

[0393] Optionally, the secondary node-to-primary node timing advance information transmission signaling further carries secondary node identification information.

[0394] Optionally, the secondary node identification information is used to help the primary node and / or the secondary node identify the secondary node that has successfully performed early uplink synchronization.

[0395] By introducing new signaling for interaction between the auxiliary node and the main node, the information transmission function is distinguished and / or clarified, the complexity of signaling processing is reduced, and / or the signaling overhead and / or redundant information is reduced. For example: when the main node receives this signaling, it can clearly identify its function as the response information of the auxiliary cell triggering early uplink synchronization, and immediately execute forwarding.

[0396] Optionally, the master node forwards the feedback information received from the candidate slave node to the source slave node. The signaling used for forwarding can be the master node and slave node interaction signaling in the existing signaling, such as: slave node addition request, slave node modification request, slave node release request and wireless resource control transmission, etc.

[0397] Optionally, the master node forwards the feedback information received from the candidate secondary node to the source secondary node. The signaling used for forwarding may also be new master node and secondary node interaction signaling, such as: master node-secondary node time advance information transmission signaling, inter-base station time advance information transmission signaling, and secondary cell group LTM request signaling, etc. The above signaling carries the candidate cell time advance information in the feedback information sent by the candidate secondary node to the master node and / or carries the secondary node identifier.

[0398] In the technical solution of this embodiment, the source auxiliary node sends downlink control information to trigger the terminal device to perform early uplink synchronization on at least one target candidate cell; the candidate auxiliary node can enhance the existing signaling and / or introduce new signaling so that the main node receives the time advance information and / or auxiliary node identification and forwards it to the source auxiliary node, which is then used to realize SCG LTM switching between different central units.

[0399] Eleventh embodiment

[0400] Based on any of the foregoing embodiments of the present application, this embodiment further discloses the switching method in the foregoing embodiments, and specifically discloses a solution for performing LTM switching.

[0401] Optionally, the terminal device performs layer 1 measurement reporting.

[0402] Optionally, the terminal device reports the measurement result according to the reporting configuration and / or reports the measurement result according to the measurement event.

[0403] Optionally, when the candidate cell and / or the serving cell meets a measurement event, measurement reporting is triggered.

[0404] Optionally, the source secondary node sends a cell switch command (Cell Switch Command) to trigger the terminal device to perform LTM switching.

[0405] Optionally, the terminal device performs LTM switching between different central units and / or LTM switching between different central units SCG according to the cell switching command.

[0406] Optionally, the cell switching command carries at least one of the target candidate cell time advance information, the candidate cell configuration identifier (Candidate configuration index), and the candidate cell random access parameter.

[0407] Optionally, the timing advance information belongs to different central unit secondary node cells.

[0408] Optionally, the cell switching command is sent via a MAC Control Element (MAC Control Element).

[0409] Optionally, the terminal device determines whether to switch to a different central unit based on the central unit identifier of the secondary node serving cell and the central unit identifier of the candidate cell.

[0410] Optionally, the source secondary node sends a cell switching notification signaling to inform the primary node to perform secondary cell group switching.

[0411] Optionally, the cell handover notification signaling is carried in the secondary node-primary node cell handover notification signaling.

[0412] Optionally, the cell handover notification signaling may be existing signaling, including at least one of secondary node modification requirement, secondary node modification request confirmation, secondary node addition request confirmation, secondary node release request confirmation, radio resource control transfer, and secondary cell group LTM request confirmation.

[0413] Optionally, the cell switch notification signaling may also be a newly introduced signaling, such as SN-MN Cell Switch Notification, which is not specifically limited in this embodiment.

[0414] Optionally, the cell switching notification signaling carries candidate secondary node and / or target secondary node information, including at least one of a secondary node identifier, a candidate cell identifier (Candidate Cell Identity), a cell identifier (Cell Identity), a central unit identifier (CU-ID), and a candidate configuration identifier (Candidate Config Identity).

[0415] Optionally, the candidate secondary node and / or target secondary node information is used to instruct the primary node to forward the first uplink data sent by the terminal device to the candidate secondary node, and / or forward uplink information delivery multiple radio dual links (ULInformationTransferMRDC) to the candidate secondary node.

[0416] Optionally, the multiple wireless dual links carry radio resource control reconfiguration completion information.

[0417] Optionally, the primary node sends a cell switching notification signaling to the candidate secondary node to inform the candidate secondary node to perform secondary cell group switching.

[0418] Optionally, the cell switching notification signaling may be existing signaling, including at least one of secondary node modification requirement, secondary node modification request confirmation, secondary node addition request confirmation, secondary node release request confirmation, radio resource control transfer, and secondary cell group LTM request confirmation.

[0419] Optionally, the cell switch notification signaling may also be a newly introduced signaling, such as MN-SN Cell Switch Notification, which is not specifically limited in this embodiment.

[0420] Optionally, the cell switching notification signaling carries candidate secondary node and / or target secondary node information, including at least one of a secondary node identifier, a candidate cell identifier (Candidate Cell Identity), a cell identifier (Cell Identity), a central unit identifier (CU-ID), and a candidate configuration identifier (Candidate Config Identity).

[0421] Optionally, the candidate secondary node and / or target secondary node information is used to instruct the primary node to forward the first uplink data sent by the terminal device to the candidate secondary node, and / or forward uplink information delivery multiple radio dual links (ULInformationTransferMRDC) to the candidate secondary node.

[0422] Optionally, the uplink information delivery multiple radio dual links carries radio resource control reconfiguration completion information.

[0423] Optionally, after the terminal device receives the cell switching command sent by the source secondary node, if there is no time advance information of the candidate cell, the random access process is performed.

[0424] Optionally, the terminal device performs a random access procedure with the target candidate cell based on the random access parameters carried in the cell switching command.

[0425] Optionally, the terminal device sends cell switching completion information and / or the first uplink data to the master node.

[0426] Optionally, the cell handover completion information may be uplink information transfer multiple radio dual links (UL Information Transfer MRDC) and / or radio resource control reconfiguration complete signaling.

[0427] Optionally, the cell switching completion information is used to indicate that the LTM switching of the secondary cell group is completed.

[0428] Optionally, the uplink information delivery multiple radio dual-link signaling further carries at least one of a secondary node identifier, a candidate cell identifier (Candidate Cell Identity), a cell identifier (Cell Identity), a central unit identifier (CU-ID), and a candidate configuration identifier (Candidate Config Identity).

[0429] Optionally, in a random access-free (RACH-Less) scenario, if the terminal device has executed the early uplink synchronization process and sent the first uplink data and / or wireless resource control reconfiguration signaling according to the time advance information carried by the cell switching command, and receives new downlink and / or uplink scheduling from the candidate cell, the cell switching is deemed to be completed.

[0430] Optionally, if the terminal device receives a cell switching command and performs a random access procedure, the cell switching is deemed to be completed when the random access procedure is successfully completed.

[0431] Optionally, after the cell handover is completed, the candidate cell is regarded as the serving cell.

[0432] Optionally, the primary node forwards the cell switching completion information and / or the first uplink data to the target secondary node.

[0433] Optionally, the primary node selects or determines the target secondary node from the candidate secondary nodes in the following manner:

[0434] Method 1: The primary node determines the target secondary node based on the information provided by the source secondary node;

[0435] Optionally, the master node determines the target secondary node through the target secondary node information provided in the cell switching notification signaling sent by the source secondary node, and forwards the uplink data and / or radio resource control reconfiguration completion signaling sent by the terminal device to the target secondary node.

[0436] Method 2: The master node determines the target slave node based on the information provided by the terminal device.

[0437] Optionally, the master node determines the target secondary node through the target secondary node information provided in the multiple wireless dual-link signaling and / or wireless resource control reconfiguration completion signaling delivered by the uplink information, and forwards the uplink data and / or wireless resource control reconfiguration completion signaling sent by the terminal device to the target secondary node.

[0438] Optionally, the terminal device sends uplink data and / or receives new downlink data based on the time advance information.

[0439] Optionally, the terminal device sends uplink data based on the time advance information.

[0440] Optionally, the uplink data is the first uplink data.

[0441] Optionally, before the master node initiates the secondary node change request process and sends the secondary node change request signaling to at least one candidate secondary node, it also includes: the terminal device reports a measurement report (Measurement Report), and the master node determines to perform secondary cell group LTM switching based on the measurement report uploaded by the terminal device.

[0442] Optionally, the measurement report includes: secondary cell and / or secondary node measurement results.

[0443] Optionally, after the terminal device switches to a target secondary node among the candidate secondary nodes, it may perform continuous LTM switching to other candidate secondary nodes.

[0444] Optionally, other candidate secondary nodes may be candidate secondary nodes other than the target secondary node, or may be the primary node in the aforementioned embodiment.

[0445] In the technical solution of this embodiment, the terminal device actively notifies the main node of the candidate secondary node information for executing the secondary cell group LTM switching, helps the main node determine the target secondary node, and forwards the first uplink data and / or wireless resource control reconfiguration completion information sent by the terminal device after completing the switching to the target secondary node, so as to avoid the main node not knowing the secondary node to which the terminal device is about to switch, resulting in LTM switching failure and / or inability to execute data forwarding, causing data interaction delay; and / or, clarifies the LTM switching process of the secondary nodes of different central units and / or the LTM switching process of different central units SCG, and / or, enhances the existing signaling and / or introduces new interactive signaling to meet the switching requirements of different central units.

[0446] Twelfth embodiment

[0447] 8 is a schematic flow chart of a switching method according to a twelfth embodiment. The method of this embodiment can be applied to a terminal device, and includes the following steps:

[0448] S3: performing LTM handover based on a cell handover command, where the cell handover command is determined by the secondary node based on interactive signaling between the primary node and the secondary node.

[0449] Optionally, the interactive signaling between the primary node and the secondary node includes at least one of secondary node change request signaling, secondary node change request confirmation signaling, secondary node change requirement signaling, secondary node change requirement determination signaling, and secondary node LTM requirement determination signaling.

[0450] Optionally, the source secondary node sends a secondary node change request signaling to the primary node.

[0451] Optionally, the secondary node change request signaling is used to request secondary node LTM configuration information;

[0452] Optionally, the secondary node change requirement signaling carries at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, and a layer 1 measurement event.

[0453] Optionally, the primary node sends a secondary node change request signaling to the source secondary node and / or the candidate secondary node.

[0454] Optionally, the secondary node change request signaling is sent by the primary node.

[0455] Optionally, the secondary node change request signaling is used to initiate a secondary node change request process.

[0456] Optionally, the secondary node change request signaling is used to request configuration of at least one candidate cell in the target secondary node.

[0457] Optionally, the secondary node change request signaling carries at least one of the target candidate cell identifier, the candidate cell LTM configuration identifier, the LTM configuration identifier comparison list, the requested channel state indication resource configuration, the central unit identifier indication, the central unit identifier, and the central unit identifier comparison list.

[0458] Optionally, the secondary node change request signaling includes at least one of a secondary node add request, a secondary node modify request, a secondary node release request, and a secondary node LTM request.

[0459] Optionally, the candidate secondary node sends a secondary node change request confirmation signaling to the primary node.

[0460] Optionally, the secondary node change request confirmation signaling includes at least one of a secondary node add request confirmation, a secondary node modify request confirmation, a secondary node release request confirmation, and a secondary node LTM request confirmation.

[0461] Optionally, the secondary node change request confirmation signaling is used to carry feedback signaling.

[0462] Optionally, the secondary node change request confirmation signaling is used to provide at least one candidate cell configuration in the target secondary node.

[0463] Optionally, the terminal device receives radio resource control reconfiguration signaling sent by the master node.

[0464] Optionally, the terminal device sends a radio resource control reconfiguration completion signaling to the master node.

[0465] Optionally, the primary node sends a secondary node change requirement confirmation signaling and / or a secondary node LTM request confirmation signaling to the source secondary node based on the radio resource control reconfiguration completion signaling.

[0466] Optionally, the secondary node change requirement determination signaling and / or the secondary node LTM request determination signaling is used to determine that the radio resource control reconfiguration is completed.

[0467] Optionally, the terminal device performs early downlink synchronization of the candidate cell based on the secondary node LTM configuration information in the radio resource control reconfiguration signaling.

[0468] Optionally, the terminal device receives downlink control information sent by the source auxiliary node.

[0469] Optionally, the terminal device sends a random access preamble based on downlink control information.

[0470] Optionally, the random access preamble is used to trigger the target candidate cell to calculate timing advance information.

[0471] Optionally, the source secondary node sends a cell switching notification signaling to the primary node.

[0472] Optionally, the terminal device receives a cell switching command sent by the source secondary node.

[0473] Optionally, the cell switching notification signaling is used to inform the primary node to perform secondary cell group switching.

[0474] Optionally, the cell handover notification signaling is carried in the secondary node-primary node cell handover notification signaling.

[0475] Optionally, the terminal device sends the first uplink data to the master node based on the time advance information carried in the cell switching command.

[0476] Optionally, the timing advance information is sent by the candidate secondary node to the primary node.

[0477] Optionally, the timing advance information is forwarded by the master node to the source slave node.

[0478] Optionally, the timing advance information is carried in master node-secondary node timing advance information transmission signaling and / or inter-base station timing advance information transmission signaling.

[0479] Optionally, the terminal device sends a wireless resource reconfiguration completion signaling and / or the first uplink data to the master node.

[0480] Optionally, the primary node sends a radio resource reconfiguration completion signaling and / or the first uplink data to a target secondary node among the candidate secondary nodes.

[0481] Optionally, the candidate secondary nodes are secondary nodes of different central units.

[0482] Optionally, the target secondary node is determined based on cell handover notification signaling and / or radio resource reconfiguration completion signaling.

[0483] In the technical solution of this embodiment, LTM switching is performed by the terminal device based on the cell switching command. The cell switching command is determined by the auxiliary node based on the interactive signaling between the main node and the auxiliary node, which improves the LTM switching mechanism so that the LTM switching mode not only supports continuous switching under the same central unit, but also supports switching between different central units, thereby improving the applicability and / or diversity of LTM switching.

[0484] Please refer to Figure 9, which is a schematic diagram of the structure of a switching device provided in an embodiment of the present application. The device can be installed in or is a network device (e.g., a slave node) in the above-mentioned method embodiment. The switching device shown in Figure 9 can be used to perform some or all of the functions of the method embodiment described in the above embodiment. As shown in Figure 9, the switching device 1100 includes:

[0485] The first switching module 1101 is configured to perform LTM switching of the secondary node based on the interactive signaling between the primary node and the secondary node.

[0486] Optionally, the interactive signaling between the primary node and the secondary node includes at least one of secondary node change request signaling, secondary node change request confirmation signaling, secondary node change requirement signaling, secondary node change requirement determination signaling, and secondary node LTM requirement determination signaling.

[0487] Optionally, the device further comprises at least one of the following:

[0488] Send the secondary node change request signaling to the primary node;

[0489] Receive the secondary node change request signaling sent by the primary node;

[0490] Sending a secondary node change request confirmation signaling to the primary node;

[0491] receiving a secondary node change requirement determination signaling and / or a secondary node LTM requirement determination signaling;

[0492] Send downlink control information to the terminal device;

[0493] Receiving time advance information and / or secondary node identification sent by the primary node;

[0494] Send cell handover notification signaling to the master node;

[0495] Send a cell switching command to the terminal device.

[0496] Optionally, the device further comprises at least one of the following:

[0497] The at least one secondary node includes a source secondary node and / or a candidate secondary node;

[0498] Secondary node change request signaling is used to initiate secondary node LTM configuration information;

[0499] The secondary node change requirement signaling carries at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, and a layer 1 measurement event;

[0500] Secondary node change request signaling is used to provide candidate secondary node LTM configuration;

[0501] The secondary node change request signaling carries at least one of a candidate cell identifier, a candidate cell LTM configuration identifier, an LTM configuration identifier comparison list, a requested channel state indication resource configuration, a central unit identifier indication, a central unit identifier, and a central unit identifier comparison list;

[0502] The secondary node change request signaling includes at least one of a secondary node add request, a secondary node modify request, a secondary node release request, and a secondary node LTM request;

[0503] The secondary node change request confirmation signaling includes at least one of a secondary node add request confirmation, a secondary node modify request confirmation, a secondary node release request confirmation, and a secondary node LTM request confirmation;

[0504] The secondary node change request confirmation signaling carries the updated secondary node LTM configuration information;

[0505] The secondary node change requirement determination signaling and / or the secondary node LTM requirement determination signaling are used to determine that the secondary node LTM configuration is complete;

[0506] The downlink control information is used to trigger the terminal device to perform early uplink synchronization with the candidate secondary node;

[0507] The timing advance information is carried in the master node-slave node timing advance information transmission signaling and / or the inter-base station timing advance information transmission signaling;

[0508] The cell handover notification signaling is used to inform the master node to perform a secondary cell group handover;

[0509] The cell handover notification signaling is carried in the secondary node-primary node cell handover notification signaling.

[0510] Optionally, the device further comprises at least one of the following:

[0511] The radio resource control configuration includes a central unit identifier and / or a candidate cell configuration;

[0512] The secondary node change request signaling and / or the secondary node LTM request confirmation signaling carry the central unit identifier;

[0513] The candidate secondary node LTM configuration includes at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, a layer 1 measurement event, and a channel state indication reporting configuration;

[0514] Updating the secondary node LTM configuration information includes at least one of random access configuration, TCI state configuration, channel state indication configuration, radio resource control configuration, layer 1 measurement event, and channel state indication reporting configuration;

[0515] The master node-slave node timing advance information transmission signaling also carries the slave node identification information;

[0516] The candidate auxiliary nodes are auxiliary nodes of different central units;

[0517] The central unit identification indication is used to request the central unit identification indication of the candidate secondary node;

[0518] The central unit identifier and / or the central unit identifier comparison list is used to provide the candidate secondary node central unit identifier;

[0519] The central unit identifier includes a serving cell central unit identifier and / or a candidate cell central unit identifier.

[0520] The switching device provided in the embodiment of the present application can execute the technical solution shown in the above method embodiment. Its implementation principle and beneficial effects are similar and will not be repeated here.

[0521] Please refer to Figure 10, which is a second structural diagram of a switching device provided in an embodiment of the present application. The device can be installed on or is the network device (e.g., the master node) in the above-mentioned method embodiment. The switching device shown in Figure 10 can be used to perform some or all of the functions of the method embodiment described in the above embodiment. As shown in Figure 10, the switching device 1200 includes:

[0522] The second switching module 1201 is configured to perform LTM switching of the secondary node based on the interactive signaling between the primary node and the secondary node.

[0523] Optionally, the interactive signaling between the primary node and the secondary node includes at least one of secondary node change request signaling, secondary node change request confirmation signaling, secondary node change requirement signaling, secondary node change requirement determination signaling, and secondary node LTM requirement determination signaling.

[0524] Optionally, the device further comprises at least one of the following:

[0525] Receive a secondary node change request signaling sent by a source secondary node;

[0526] Sending a secondary node change request signaling to at least one secondary node;

[0527] Receive a secondary node change request confirmation signaling;

[0528] Sending a secondary node change requirement confirmation signaling and / or a secondary node LTM request confirmation signaling to at least one secondary node;

[0529] receiving timing advance information and / or a secondary node identifier sent by a candidate secondary node;

[0530] Forwarding the timing advance information and / or the secondary node identifier to the source secondary node;

[0531] receiving a cell switching notification signaling sent by a source secondary node;

[0532] Receiving a radio resource reconfiguration completion signaling and / or the first uplink data sent by the terminal device;

[0533] Forwarding the radio resource reconfiguration completion signaling and / or the first uplink data to a target secondary node among the candidate secondary nodes.

[0534] Optionally, the device further comprises at least one of the following:

[0535] The at least one secondary node includes a source secondary node and / or a candidate secondary node;

[0536] Secondary node change request signaling is used to request secondary node LTM configuration information;

[0537] The secondary node change requirement signaling carries at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, and a layer 1 measurement event;

[0538] Sending a secondary node change request signaling to at least one candidate secondary node;

[0539] Secondary node change request signaling is used to request the LTM configuration of a candidate secondary node;

[0540] The secondary node change request signaling carries at least one of a candidate cell identifier, a candidate cell LTM configuration identifier, an LTM configuration identifier comparison list, a requested channel state indication resource configuration, a central unit identifier indication, a central unit identifier, and a central unit identifier comparison list;

[0541] The secondary node change request signaling includes at least one of a secondary node add request, a secondary node modify request, a secondary node release request, and a secondary node LTM request;

[0542] The secondary node change request confirmation signaling includes at least one of a secondary node add request confirmation, a secondary node modify request confirmation, a secondary node release request confirmation, and a secondary node LTM request confirmation;

[0543] The secondary node change request confirmation signaling is used to provide the candidate secondary node LTM configuration;

[0544] The secondary node change requirement determination signaling and / or the secondary node LTM requirement determination signaling are used to determine that the secondary node LTM configuration is complete;

[0545] The timing advance information is carried in the master node-slave node timing advance information transmission signaling and / or the inter-base station timing advance information transmission signaling;

[0546] The cell handover notification signaling is used to inform the master node to perform a secondary cell group handover;

[0547] The cell handover notification signaling is carried in the secondary node-primary node cell handover notification signaling;

[0548] The target secondary node determines that the handover is completed based on the cell handover notification signaling and / or the radio resource reconfiguration completion signaling.

[0549] Optionally, the device further comprises at least one of the following:

[0550] The radio resource control configuration includes a central unit identifier and / or a candidate cell configuration;

[0551] The secondary node change request signaling and / or the secondary node LTM request confirmation signaling carry the central unit identifier;

[0552] The central unit identification indication is used to request the central unit identification indication of the candidate secondary node;

[0553] The central unit identifier and / or the central unit identifier comparison list is used to provide the secondary node central unit identifier;

[0554] The candidate secondary node LTM configuration includes at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, a layer 1 measurement event, and a channel state indication reporting configuration;

[0555] The central unit identifier includes a serving cell central unit identifier and / or a candidate cell central unit identifier;

[0556] The master node-slave node timing advance information transmission signaling also carries the slave node identification information;

[0557] The candidate auxiliary nodes are auxiliary nodes of different central units.

[0558] Please refer to Figure 11, which is a third structural diagram of a switching device provided in an embodiment of the present application. The device can be installed in or is the terminal device (e.g., a mobile phone) in the above-mentioned method embodiment. The switching device shown in Figure 11 can be used to perform some or all of the functions of the method embodiment described in the above embodiment. As shown in Figure 11, the switching device 1300 includes:

[0559] The third switching module 1301 is configured to perform LTM switching based on a cell switching command, where the cell switching command is determined by the secondary node based on signaling exchanged between the primary node and the secondary node.

[0560] Optionally, the interactive signaling between the primary node and the secondary node includes at least one of secondary node change request signaling, secondary node change request confirmation signaling, secondary node change requirement signaling, secondary node change requirement determination signaling, and secondary node LTM requirement determination signaling.

[0561] Optionally, performing LTM handover based on the cell handover command includes at least one of the following:

[0562] The source slave node sends a slave node change request signaling to the master node;

[0563] The primary node sends a secondary node change request signaling to the source secondary node and / or the candidate secondary node;

[0564] The candidate secondary node sends a secondary node change request confirmation signaling to the primary node;

[0565] receiving a radio resource control reconfiguration signaling sent by the master node;

[0566] Sending radio resource control reconfiguration completion signaling to the master node;

[0567] The master node sends a secondary node change requirement confirmation signaling and / or a secondary node LTM request confirmation signaling to the source secondary node based on the radio resource control reconfiguration completion signaling;

[0568] Perform early downlink synchronization of the candidate cell based on the secondary node LTM configuration information in the radio resource control reconfiguration signaling;

[0569] receiving downlink control information sent by the source slave node;

[0570] Sending a random access preamble based on downlink control information;

[0571] The source secondary node sends a cell handover notification signaling to the primary node;

[0572] Sending the first uplink data to the master node based on the time advance information carried in the cell switching command;

[0573] Sending radio resource reconfiguration completion signaling and / or first uplink data to the master node;

[0574] The primary node sends a radio resource reconfiguration completion signaling and / or the first uplink data to a target secondary node among the candidate secondary nodes.

[0575] Optionally, the device further comprises at least one of the following:

[0576] Secondary node change request signaling is used to request secondary node LTM configuration information;

[0577] The secondary node change requirement signaling carries at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, and a layer 1 measurement event;

[0578] The secondary node change request signaling is sent by the primary node;

[0579] The secondary node change request signaling is used to initiate the secondary node change request process;

[0580] The secondary node change request signaling is used to request configuration of at least one candidate cell in the target secondary node;

[0581] The secondary node change request signaling carries at least one of the target candidate cell identifier, the candidate cell LTM configuration identifier, the LTM configuration identifier comparison list, the requested channel state indication resource configuration, the central unit identifier indication, the central unit identifier, and the central unit identifier comparison list;

[0582] The secondary node change request signaling includes at least one of a secondary node add request, a secondary node modify request, a secondary node release request, and a secondary node LTM request;

[0583] The secondary node change request confirmation signaling includes at least one of a secondary node add request confirmation, a secondary node modify request confirmation, a secondary node release request confirmation, and a secondary node LTM request confirmation;

[0584] The secondary node change request confirmation signaling is used to carry feedback signaling;

[0585] The secondary node change request confirmation signaling is used to provide at least one candidate cell configuration in the target secondary node;

[0586] The secondary node change requirement determination signaling and / or the secondary node LTM request determination signaling are used to determine that the radio resource control reconfiguration is completed;

[0587] The time advance information is sent from the candidate slave node to the master node;

[0588] The time advance information is forwarded by the master node to the source slave node;

[0589] The timing advance information is carried in the master node-slave node timing advance information transmission signaling and / or the inter-base station timing advance information transmission signaling;

[0590] The cell handover notification signaling is used to inform the master node to perform a secondary cell group handover;

[0591] The cell handover notification signaling is carried in the secondary node-primary node cell handover notification signaling;

[0592] The target secondary node is determined based on the cell handover notification signaling and / or the radio resource reconfiguration completion signaling;

[0593] The random access preamble is used to trigger the target candidate cell to calculate the time advance information;

[0594] The candidate auxiliary nodes are auxiliary nodes of different central units.

[0595] Refer to Figure 12, which is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. As shown in Figure 12, the communication device 160 described in this embodiment can be the terminal device (or component that can be used for a terminal device) or network device (or component that can be used for a network device) mentioned in the aforementioned method embodiment. The communication device 160 can be used to implement the methods corresponding to the terminal device or network device described in the aforementioned method embodiment. For details, please refer to the description of the aforementioned method embodiment.

[0596] The communication device 160 may include one or more processors 161, also referred to as processing units, which may perform certain control or processing functions. Processor 161 may be a general-purpose processor or a dedicated processor. For example, it may be a baseband processor or a central processing unit. The baseband processor may be used to process communication protocols and communication data, while the central processing unit may be used to control the communication device, execute software programs, and process software program data.

[0597] Optionally, the processor 161 may also store instructions 163 or data (eg, intermediate data). Optionally, the instructions 163 may be executed by the processor 161 to enable the communication device 160 to execute the method corresponding to the terminal device or network device described in the above method embodiment.

[0598] Optionally, the communication device 160 may include a circuit that can implement the functions of sending, receiving, or communicating in the aforementioned method embodiments.

[0599] Optionally, the communication device 160 may include one or more memories 162 , on which instructions 164 may be stored. The instructions may be executed on the processor 161 , so that the communication device 160 performs the method described in the above method embodiment.

[0600] Optionally, data may also be stored in the memory 162. The processor 161 and the memory 162 may be provided separately or integrated together.

[0601] Optionally, the communication device 160 may further include a transceiver 165 and / or an antenna 166. The processor 161 may be referred to as a processing unit, and controls the communication device 160 (terminal device, core network device, or wireless access network device). The transceiver 165 may be referred to as a transceiver unit, transceiver, transceiver circuit, or transceiver, and is used to implement the transceiver functions of the communication device 160.

[0602] Optionally, if the communication device 160 is used to implement operations corresponding to the terminal device in the above embodiments, for example, the transceiver 165 can receive the cell configuration; and the processor 161 can perform LTM switching based on the cell switching command.

[0603] Optionally, the specific implementation process of the processor 161 and the transceiver 165 can refer to the relevant description of the above embodiments, which will not be repeated here.

[0604] Optionally, if the communication device 160 is used to implement operations corresponding to the network devices in the above embodiments, for example, the transceiver 165 may send a cell switching command so that the terminal device performs LTM switching based on the cell switching command.

[0605] Optionally, the specific implementation process of the processor 161 and the transceiver 165 can refer to the relevant description of the above embodiments, which will not be repeated here.

[0606] The processor 161 and transceiver 165 described in this application may be implemented on an IC (Integrated Circuit), an analog integrated circuit, an RFIC (Radio Frequency Integrated Circuit), a mixed-signal integrated circuit, an ASIC (Application Specific Integrated Circuit), a PCB (Printed Circuit Board), an electronic device, etc. The processor 161 and transceiver 165 may also be manufactured using various integrated circuit process technologies, such as CMOS (Complementary Metal Oxide Semiconductor), NMOS (N Metal-Oxide-Semiconductor), PMOS (Positive Channel Metal Oxide Semiconductor), BJT (Bipolar Junction Transistor), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

[0607] In this application, a communication device may be a terminal device (such as a mobile phone) or a network device (such as a primary node or a secondary node), and the specific definition needs to be determined based on the context. In addition, the terminal device can be implemented in various forms. For example, the terminal devices described in this application may include mobile terminals such as mobile phones, tablet computers, laptop computers, PDAs, portable media players (PMPs), navigation devices, wearable devices, smart bracelets, pedometers, etc., as well as fixed terminal devices such as digital TVs and desktop computers.

[0608] Although the communication device is described above by taking a terminal device or a network device as an example, the scope of the communication device described in this application is not limited to the above-mentioned terminal device or network device, and the structure of the communication device may not be limited to Figure 12. The communication device may be an independent device or may be part of a larger device.

[0609] An embodiment of the present application further provides a communication system, including: a terminal device as in any of the above embodiments; and a network device as in any of the above embodiments.

[0610] An embodiment of the present application also provides a communication device, including a memory and a processor, wherein a switching program is stored in the memory, and when the switching program is executed by the processor, the steps of the switching method in any of the above embodiments are implemented.

[0611] The communication device in this application can be a terminal device (such as a mobile phone) or a network device (such as a master node or a slave node). The specific reference needs to be clarified based on the context.

[0612] An embodiment of the present application further provides a storage medium on which a switching program is stored. When the switching program is executed by a processor, the steps of the switching method in any of the above embodiments are implemented.

[0613] In the embodiments of the communication device and storage medium provided in the embodiments of the present application, all technical features of any of the above-mentioned switching method embodiments may be included. The expanded and explained contents of the specification are basically the same as those of the embodiments of the above-mentioned methods and will not be repeated here.

[0614] An embodiment of the present application further provides a computer program product, which includes computer program code. When the computer program code runs on a computer, the computer executes the methods in the various possible implementation modes described above.

[0615] An embodiment of the present application also provides a chip, including a memory and a processor, wherein the memory is used to store computer programs, and the processor is used to call and run the computer programs from the memory, so that a device equipped with the chip executes the methods in the various possible implementation modes as described above.

[0616] It is understood that the above scenarios are merely examples and do not limit the application scenarios of the technical solutions provided in the embodiments of this application. The technical solutions of this application can also be applied to other scenarios. For example, those skilled in the art will appreciate that with the evolution of system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application will also be applicable to similar technical problems.

[0617] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0618] The steps in the method of the embodiment of the present application can be adjusted in order, combined and deleted according to actual needs.

[0619] The units in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0620] In this application, the same or similar terminology, technical solutions and / or application scenario descriptions are generally only described in detail the first time they appear. When they appear again later, they are generally not repeated for the sake of brevity. When understanding the technical solutions and other contents of this application, for the same or similar terminology, technical solutions and / or application scenario descriptions that are not described in detail later, you can refer to the previous relevant detailed descriptions.

[0621] In this application, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0622] The various technical features of the technical solution of this application can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0623] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as above, and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, controlled terminal device, or network device, etc.) to execute the method of each embodiment of the present application.

[0624] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When software is used for implementation, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. 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 storage medium or transmitted from one storage medium to another storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) means. The storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium can be a magnetic medium (e.g., a floppy disk, a storage disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state storage disk Solid State Disk (SSD)).

[0625] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A switching method, wherein: The switching method is applied to at least one secondary node, comprising the steps of: S2: Execute the secondary node LTM switching based on the interactive signaling between the primary node and the secondary node.

2. The method of claim 1, wherein: The interactive signaling between the primary node and the secondary node includes at least one of secondary node change request signaling, secondary node change request confirmation signaling, secondary node change requirement signaling, secondary node change requirement determination signaling and secondary node LTM requirement determination signaling.

3. The method of claim 1, wherein: Also includes at least one of the following: Sending secondary node change request signaling to the primary node; Receive a secondary node change request signaling sent by the primary node; Sending a secondary node change request confirmation signaling to the primary node; receiving a secondary node change requirement determination signaling and / or a secondary node LTM requirement determination signaling; Sending downlink control information to terminal equipment; Receiving time advance information and / or secondary node identification sent by the primary node; Send cell switching notification signaling to the master node; Send a cell switching command to the terminal device.

4. The method as claimed in claim 3, wherein: Also includes at least one of the following: The at least one secondary node includes a source secondary node and / or a candidate secondary node; The auxiliary node change demand signaling is used to initiate auxiliary node LTM configuration information; The secondary node change demand signaling carries at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, and a layer 1 measurement event; Secondary node change request signaling is used to provide candidate secondary node LTM configuration; The secondary node change request signaling carries at least one of a candidate cell identifier, a candidate cell LTM configuration identifier, an LTM configuration identifier comparison list, a requested channel state indication resource configuration, a central unit identifier indication, a central unit identifier, and a central unit identifier comparison list; The secondary node change request signaling includes at least one of a secondary node add request, a secondary node modify request, a secondary node release request, and a secondary node LTM request; The secondary node change request confirmation signaling includes at least one of a secondary node add request confirmation, a secondary node modify request confirmation, a secondary node release request confirmation, and a secondary node LTM request confirmation; The secondary node change request confirmation signaling carries the updated secondary node LTM configuration information; The secondary node change requirement determination signaling and / or the secondary node LTM requirement determination signaling are used to determine that the secondary node LTM configuration is complete; The downlink control information is used to trigger the terminal device to perform early uplink synchronization with the candidate secondary node; The time advance information is carried in the master node-slave node time advance information transmission signaling and / or the inter-base station time advance information transmission signaling; The cell switching notification signaling is used to inform the master node to perform a secondary cell group switching; The cell switching notification signaling is carried in the secondary node-primary node cell switching notification signaling.

5. The method as claimed in claim 4, wherein: Also includes at least one of the following: The radio resource control configuration includes a central unit identifier and / or a candidate cell configuration; The auxiliary node change requirement signaling and / or the auxiliary node LTM request confirmation signaling carry the central unit identifier; The candidate secondary node LTM configuration includes at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, a layer 1 measurement event, and a channel state indication reporting configuration; Updating the secondary node LTM configuration information includes at least one of random access configuration, TCI state configuration, channel state indication configuration, radio resource control configuration, layer 1 measurement event, and channel state indication reporting configuration; The master node-slave node time advance information transmission signaling also carries the slave node identification information; The candidate auxiliary nodes are auxiliary nodes of different central units; The central unit identification indication is used to request the central unit identification indication of the candidate secondary node; The central unit identifier and / or the central unit identifier comparison list is used to provide the candidate secondary node central unit identifier; The central unit identifier includes a serving cell central unit identifier and / or a candidate cell central unit identifier.

6. A switching method, the switching method being applied to a master node, wherein: Includes steps: S1: Execute LTM switching of the secondary node based on the interactive signaling between the primary node and the secondary node.

7. The method of claim 6, wherein: The interactive signaling between the primary node and the secondary node includes at least one of secondary node change request signaling, secondary node change request confirmation signaling, secondary node change requirement signaling, secondary node change requirement determination signaling and secondary node LTM requirement determination signaling.

8. The method of claim 6, wherein: Also includes at least one of the following: Receiving a secondary node change request signaling sent by a source secondary node; Sending a secondary node change request signaling to at least one secondary node; Receiving a secondary node change request confirmation signaling; Sending a secondary node change requirement confirmation signaling and / or a secondary node LTM request confirmation signaling to at least one secondary node; Receiving time advance information and / or a secondary node identifier sent by a candidate secondary node; forwarding the timing advance information and / or the secondary node identifier to the source secondary node; receiving a cell switching notification signaling sent by a source secondary node; Receiving a radio resource reconfiguration completion signaling and / or the first uplink data sent by a terminal device; Forward the radio resource reconfiguration completion signaling and / or the first uplink data to a target secondary node among the candidate secondary nodes.

9. The method of claim 8, wherein: Also includes at least one of the following: The at least one secondary node includes a source secondary node and / or a candidate secondary node; Secondary node change request signaling is used to request secondary node LTM configuration information; The secondary node change demand signaling carries at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, and a layer 1 measurement event; Sending a secondary node change request signaling to at least one candidate secondary node; Secondary node change request signaling is used to request candidate secondary node LTM configuration; The secondary node change request signaling carries at least one of a candidate cell identifier, a candidate cell LTM configuration identifier, an LTM configuration identifier comparison list, a requested channel state indication resource configuration, a central unit identifier indication, a central unit identifier, and a central unit identifier comparison list; The secondary node change request signaling includes at least one of a secondary node add request, a secondary node modify request, a secondary node release request, and a secondary node LTM request; The secondary node change request confirmation signaling includes at least one of a secondary node add request confirmation, a secondary node modify request confirmation, a secondary node release request confirmation, and a secondary node LTM request confirmation; The secondary node change request confirmation signaling is used to provide the candidate secondary node LTM configuration; The secondary node change requirement determination signaling and / or the secondary node LTM requirement determination signaling are used to determine that the secondary node LTM configuration is complete; The time advance information is carried in the master node-slave node time advance information transmission signaling and / or the inter-base station time advance information transmission signaling; The cell switching notification signaling is used to inform the master node to perform a secondary cell group switching; The cell switching notification signaling is carried in the secondary node-primary node cell switching notification signaling; The target secondary node determines that the handover is completed based on the cell handover notification signaling and / or the radio resource reconfiguration completion signaling.

10. The method of claim 9, wherein: Also includes at least one of the following: The radio resource control configuration includes a central unit identifier and / or a candidate cell configuration; The auxiliary node change requirement signaling and / or the auxiliary node LTM request confirmation signaling carry the central unit identifier; The central unit identification indication is used to request the central unit identification indication of the candidate secondary node; The central unit identification and / or the central unit identification comparison list is used to provide the secondary node central unit identification; The candidate secondary node LTM configuration includes at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, a layer 1 measurement event, and a channel state indication reporting configuration; The central unit identifier includes a serving cell central unit identifier and / or a candidate cell central unit identifier; The master node-slave node time advance information transmission signaling also carries the slave node identification information; The candidate auxiliary nodes are auxiliary nodes of different central units.

11. A switching method, the switching method being applied to a terminal device, wherein: Includes steps: S3: Perform LTM switching based on a cell switching command, where the cell switching command is determined by the secondary node based on interactive signaling between the primary node and the secondary node.

12. The method of claim 11, wherein: The interactive signaling between the primary node and the secondary node includes at least one of secondary node change request signaling, secondary node change request confirmation signaling, secondary node change requirement signaling, secondary node change requirement determination signaling and secondary node LTM requirement determination signaling.

13. The method of claim 12, wherein: Step S3 includes at least one of the following: The source secondary node sends a secondary node change request signaling to the primary node; The primary node sends a secondary node change request signaling to the source secondary node and / or the candidate secondary node; The candidate secondary node sends a secondary node change request confirmation signaling to the primary node; Receiving a radio resource control reconfiguration signaling sent by a master node; Sending a radio resource control reconfiguration completion signaling to the master node; The primary node sends a secondary node change requirement confirmation signaling and / or a secondary node LTM request confirmation signaling to the source secondary node based on the radio resource control reconfiguration completion signaling; Perform early downlink synchronization of the candidate cell based on the secondary node LTM configuration information in the radio resource control reconfiguration signaling; Receiving downlink control information sent by the source slave node; Sending a random access preamble based on the downlink control information; The source secondary node sends a cell switching notification signaling to the primary node; Sending the first uplink data to the master node based on the time advance information carried in the cell switching command; Sending a radio resource reconfiguration completion signaling and / or the first uplink data to the master node; The primary node sends a radio resource reconfiguration completion signaling and / or the first uplink data to a target secondary node among the candidate secondary nodes.

14. The method of claim 13, wherein: Also includes at least one of the following: Secondary node change request signaling is used to request secondary node LTM configuration information; The secondary node change demand signaling carries at least one of a random access configuration, a TCI state configuration, a channel state indication configuration, a radio resource control configuration, and a layer 1 measurement event; The secondary node change request signaling is sent by the primary node; The secondary node change request signaling is used to initiate the secondary node change request process; The secondary node change request signaling is used to request configuration of at least one candidate cell in the target secondary node; The secondary node change request signaling carries at least one of the target candidate cell identifier, the candidate cell LTM configuration identifier, the LTM configuration identifier comparison list, the requested channel state indication resource configuration, the central unit identifier indication, the central unit identifier, and the central unit identifier comparison list; The secondary node change request signaling includes at least one of a secondary node add request, a secondary node modify request, a secondary node release request, and a secondary node LTM request; The secondary node change request confirmation signaling includes at least one of a secondary node add request confirmation, a secondary node modify request confirmation, a secondary node release request confirmation, and a secondary node LTM request confirmation; The secondary node change request confirmation signaling is used to carry feedback signaling; The secondary node change request confirmation signaling is used to provide at least one candidate cell configuration in the target secondary node; The secondary node change requirement determination signaling and / or the secondary node LTM request determination signaling are used to determine that the radio resource control reconfiguration is completed; The time advance information is sent from the candidate slave node to the master node; The time advance information is forwarded by the master node to the source slave node; The time advance information is carried in the master node-slave node time advance information transmission signaling and / or the inter-base station time advance information transmission signaling; The cell switching notification signaling is used to inform the master node to perform a secondary cell group switching; The cell switching notification signaling is carried in the secondary node-primary node cell switching notification signaling; The target secondary node is determined based on the cell switching notification signaling and / or the radio resource reconfiguration completion signaling; The random access preamble is used to trigger the target candidate cell to calculate the time advance information; The candidate auxiliary nodes are auxiliary nodes of different central units.

15. A communication device, wherein: include: A memory, a processor, and a switching program stored in the memory and executable on the processor, wherein the switching program implements the steps of the switching method as claimed in claim 1, 6 or 11 when executed by the processor.

16. A storage medium, wherein: The storage medium stores a computer program, and when the computer program is executed by the processor, the steps of the switching method according to claim 1, 6 or 11 are implemented.