Processing method, communication device, and storage medium

Abstract

In the technical solution of the present application, a first network node executes a first operation on the basis of a first message sent by a terminal device, such that the terminal device can be supported to execute random access channel-less conditional LTM, thereby reducing the switching time delay.

Description

Processing method, communication device and storage medium Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a processing method, communication equipment and storage medium. Background Art

[0002] R19 needs to support conditional LTM (L1 / L2 Triggered Mobility), that is, the terminal device triggers LTM according to pre-configured LTM execution conditions.

[0003] During the process of conceiving and implementing this application, the inventors discovered that there are at least the following problems: when the terminal device executes RACH-less (Random Access Channel-less) conditional LTM, the network device cannot know in advance the cell in which the terminal device executes the conditional LTM switching, resulting in the target cell being unable to know when to start detecting the terminal device access, and / or the existing protocol has not yet clarified how the target cell determines the beam information and / or TCI status (Transmission Configuration Indicator state) information of the terminal device access, and / or the existing protocol has not yet clarified how the target cell determines the SSB (SS / PBCH block, synchronization signal block) beam information of the configuration grant, resulting in the terminal device being unable to execute RACH-less conditional LTM, thereby increasing the switching delay.

[0004] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Technical Solutions

[0005] The main purpose of this application is to provide a processing method, a communication device and a storage medium, which are intended to support terminal devices to perform RACH-less conditional LTM, thereby reducing switching delay.

[0006] The present application provides a processing method, which is applied to a first network node (such as a base station), comprising the steps of:

[0007] S2: Execute a first operation based on a first message sent by the terminal device.

[0008] Optionally, the first message is used to instruct the terminal device to request execution of random access-free condition LTM.

[0009] Optionally, the first message includes at least one of the following:

[0010] Conditional LTM candidate cell identification information;

[0011] Terminal equipment does not need random access switching time information;

[0012] The validity period of the random access-free handover request of the terminal device;

[0013] Conditional LTM candidate cell synchronization channel block beam information and / or timing;

[0014] Requests activated TCI status information.

[0015] Optionally, performing a first operation includes at least one of the following:

[0016] Sending a cell switching notification to the candidate cell;

[0017] Send TCI status information activation message to the terminal device.

[0018] Optionally, the cell handover notification includes at least one of the following:

[0019] cell identification;

[0020] Random access-free handover request identifier;

[0021] Terminal equipment does not need random access switching time information;

[0022] The validity period of the random access-free handover request of the terminal device;

[0023] Synchronization channel block beam information and / or timing;

[0024] TCI status information.

[0025] Optionally, the method further comprises at least one of the following:

[0026] Send conditional LTM configuration information to terminal devices;

[0027] Send a PDCCH command to the terminal device.

[0028] Optionally, the conditional LTM configuration information includes subsequent conditional LTM execution conditions and / or conditional LTM candidate cell configuration.

[0029] Optionally, the PDCCH command carries an identifier instructing the terminal device to send a CFRA with RAR to the candidate cell.

[0030] The present application also provides a processing method, which can be applied to a second network node (such as a base station), comprising the steps of:

[0031] S3: Receive a cell switching notification, where the cell switching notification is sent by the first network node to the second network node based on the first message sent by the terminal device.

[0032] Optionally, the cell handover notification is forwarded by the first network node to the second network node via the third network node.

[0033] Optionally, the first message is used to instruct the terminal device to request execution of random access-free condition LTM.

[0034] Optionally, the first message includes at least one of the following:

[0035] Conditional LTM candidate cell identification information;

[0036] Terminal equipment does not need random access switching time information;

[0037] The validity period of the random access-free handover request of the terminal device;

[0038] Conditional LTM candidate cell synchronization channel block beam information and / or timing;

[0039] Requests activated TCI status information.

[0040] Optionally, the cell switching notification includes at least one of the following:

[0041] cell identification;

[0042] Random access-free handover request identifier;

[0043] Terminal equipment does not need random access switching time information;

[0044] The validity period of the random access-free handover request of the terminal device;

[0045] Synchronization channel block beam information and / or timing;

[0046] TCI status information.

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

[0048] Receiving a second message sent by the terminal device based on the PDCCH command;

[0049] sending the timing advance information of the second network node to the first network node based on the second message;

[0050] Start or stop detecting terminal device access or dynamic scheduling or configuration authorization based on cell switching notification.

[0051] This application also provides a processing method that can be applied to a terminal device (such as a mobile phone), comprising the steps of:

[0052] S1: Send a first message to enable a first network node to perform a first operation based on the first message.

[0053] Optionally, the first message is used to instruct the terminal device to request execution of random access-free condition LTM.

[0054] Optionally, the first message includes at least one of the following:

[0055] Conditional LTM candidate cell identification information;

[0056] Free random access switching time information;

[0057] Random access-free handover request validity period;

[0058] Conditional LTM candidate cell synchronization channel block beam information and / or timing;

[0059] Requests activated TCI status information.

[0060] Optionally, the conditions for sending the first message include: the terminal device has a valid timing advance value for the candidate cell, the serving cell satisfies the first condition, and the candidate cell satisfies at least one of the second condition.

[0061] Optionally, the first network node performing the first operation includes at least one of the following:

[0062] The first network node sends a cell handover notification to the candidate cell;

[0063] The first network node sends a TCI status information activation message to the terminal device.

[0064] Optionally, satisfying the first condition includes that signal quality is lower than a first threshold.

[0065] Optionally, satisfying the second condition includes that the signal quality is higher than a second threshold, and / or the LTM triggering condition is not satisfied.

[0066] Optionally, the cell switching notification includes at least one of the following:

[0067] cell identification;

[0068] Random access-free handover request identifier;

[0069] Free random access switching time information;

[0070] Random access-free handover request validity period;

[0071] Synchronization channel block beam information and / or timing;

[0072] TCI status information.

[0073] Optionally, the method further comprises at least one of the following:

[0074] receiving conditional LTM configuration information sent by the first network node;

[0075] receiving a PDCCH command sent by the first network node;

[0076] Obtain timing advance information of candidate cells;

[0077] receiving a TCI status information activation message sent by the first network node;

[0078] Perform random access-free conditional LTM.

[0079] Optionally, obtaining the timing advance information of the candidate cell includes at least one of the following:

[0080] Obtain timing advance information of candidate cells through measurement;

[0081] Obtain timing advance information of the candidate cell from the RAR monitored by the candidate cell based on the PDCCH command;

[0082] Timing advance information of the candidate cell is obtained from the first network node based on a PDCCH command, the timing advance information being forwarded from the candidate cell by the first network node.

[0083] Optionally, the conditional LTM configuration information includes subsequent conditional LTM execution conditions and / or conditional LTM candidate cell configuration.

[0084] Optionally, the PDCCH command carries an identifier instructing the terminal device to send a CFRA with RAR to the candidate cell.

[0085] The present application also provides a processing device, comprising:

[0086] An execution module is used to execute a first operation based on a first message sent by a terminal device.

[0087] The present application also provides a processing device, comprising:

[0088] The receiving module is configured to receive a cell switching notification, where the cell switching notification is sent by the first network node to the second network node based on a first message sent by the terminal device.

[0089] The present application also provides a processing device, comprising:

[0090] The sending module is configured to send a first message, so that the first network node performs a first operation based on the first message.

[0091] The present application also provides a communication device, comprising: a memory, a processor, and a processing program stored in the memory and executable on the processor, wherein the processing program implements the steps of any of the above-described processing methods when executed by the processor.

[0092] The communication device in this application can be a terminal device (such as a mobile phone) or a network device (such as a base station). The specific reference needs to be clarified in the context.

[0093] The present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of any of the processing methods described above are implemented.

[0094] In the technical solution of the present application, the first network node performs the first operation based on the first message sent by the terminal device, which can support the terminal device to perform RACH-less conditional LTM, thereby reducing the switching delay. BRIEF DESCRIPTION OF THE DRAWINGS

[0095] 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.

[0096] FIG1 is a schematic diagram of the hardware structure of a mobile terminal for implementing various embodiments of the present application;

[0097] FIG2 is a diagram of a communication network system architecture provided by an embodiment of the present application;

[0098] FIG3 is a schematic diagram of the hardware structure of a controller 140 provided in this application;

[0099] FIG4 is a schematic diagram of the hardware structure of a network node 150 provided in this application;

[0100] FIG5 is a schematic diagram of the overall process involved in the embodiment of the present application;

[0101] FIG6 is a flow chart of a processing method according to the first embodiment of the present application;

[0102] FIG7 is a schematic flow chart of a processing method according to a third embodiment of the present application;

[0103] FIG8 is a schematic flow chart of a processing method according to a fourth embodiment of the present application;

[0104] FIG9 is a schematic diagram of the interaction flow between a network device and a terminal device according to a processing method according to a tenth embodiment of the present application;

[0105] FIG10 is a first structural diagram of a processing device provided in an embodiment of the present application;

[0106] FIG11 is a second structural diagram of a processing device provided in an embodiment of the present application;

[0107] FIG12 is a third structural diagram of a processing device provided in an embodiment of the present application;

[0108] FIG13 is a schematic diagram of the structure of the communication device provided in an embodiment of the present application.

[0109] 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 later. 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.

[0110] Implementation Methods of the Application

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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 implementing the step, those skilled in the art may execute S2 first and then S1, etc., but these should all be within the scope of protection of this application.

[0117] 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.

[0118] 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.

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

[0120] 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.

[0121] 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.

[0122] 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.

[0123] The following is a detailed introduction to the various components of the mobile terminal in conjunction with Figure 1:

[0124] 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 and 6G, etc.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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 enabling the power management system to manage functions such as charging, discharging, and power consumption.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] Optionally, UE201 may be the above-mentioned terminal device 100, which will not be described in detail here.

[0140] 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 .

[0141] 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).

[0142] The IP service 204 may include the Internet, an intranet, an IMS (IP Multimedia Subsystem), or other IP services.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] Based on the above-mentioned mobile terminal hardware structure and communication network system, various embodiments of the present application are proposed.

[0151] Technical terms involved in this embodiment:

[0152] Subsequent: continuous or subsequent;

[0153] PDCCH: Physical Downlink Control Channel, physical downlink control channel;

[0154] CU: Centralized Unit, centralized unit;

[0155] DU: Distributed Unit, distributed unit;

[0156] CG: Configured Grant, configuration authorization;

[0157] RACH: Random Access CHannel, random access channel;

[0158] RACH-less: random access-free;

[0159] LTM: L1 / L2 Triggered Mobility, layer 1 / layer 2 triggered mobility;

[0160] SSB: SS / PBCH block, synchronization signal block;

[0161] TA: Timing Advance, timing advance;

[0162] Early TA acquisition: early acquisition at an early time;

[0163] TCI: Transmission Configuration Indicator, transmission configuration indication;

[0164] PDCCH order: PDCCH order;

[0165] CFRA: Contention Free Random Access, non-contention random access;

[0166] RAR: Random Access Response, random access response;

[0167] configure grant occasion: configure grant occasion;

[0168] MAC CE: Medium Access Control Control Element, media access control control element;

[0169] MSG1: Message 1, random access request message sent by the terminal device to the network device.

[0170] 5 , which is a schematic diagram of the overall flow of interaction between a terminal device and a network device (such as a base station) involved in the processing method of an embodiment of the present application.

[0171] As shown in Figure 5, the network system architecture includes: a terminal device, a first network node (e.g., a source gNB-DU), a second network node (e.g., a candidate gNB-DU), and a third network node (e.g., a gNB-CU). The overall process includes:

[0172] Step 1: The network device decides to configure conditional LTM and initiates the conditional LTM preparation process.

[0173] Step 2: The network device (e.g., source gNB-DU) sends an RRC Reconfiguration message to the terminal device. The RRC Reconfiguration message includes the conditional LTM candidate cell configuration and the continuous conditional LTM execution condition. The terminal device stores the conditional LTM configuration.

[0174] Step 3: The UE sends an RRC Reconfiguration Complete message to the network device (e.g., source gNB-DU).

[0175] Step 4: The terminal device starts to evaluate the execution conditions of the LTM candidate cells.

[0176] Step 5: The terminal device and the LTM candidate cell perform downlink synchronization.

[0177] Step 6a: When UE-based TA measurement is configured, the UE obtains the TA value of the candidate cell through measurement.

[0178] Step 6b: For the scenario of early TA acquisition triggered by PDCCH command:

[0179] Scenario 1: The terminal device receives a PDCCH command from the current source cell (e.g., the serving cell corresponding to the first network node) that triggers CFRA to perform early candidate cell acquisition. The PDCCH command carries an identifier instructing the terminal device to monitor the RAR in the candidate cell after sending MSG1. The RAR carries the candidate cell TA information.

[0180] Scenario 2: The terminal device receives a PDCCH command from the source cell, triggering CFRA to acquire candidate cells in advance. After receiving MSG1, the candidate cell sends the TA information to the current source cell, and the source cell sends the TA information to the terminal device via MAC CE.

[0181] Step 7: The terminal device initiates an LTM pre-switching request to the current serving cell through MAC CE, indicating that the terminal device may perform random access-free conditional LTM switching on a candidate cell.

[0182] Optionally, the terminal device independently decides when to initiate the request.

[0183] Optionally, the terminal device initiates a request when the terminal device meets at least one of the following conditions:

[0184] When the candidate cell has a valid TA (which can be triggered by UE-based TA measurement / PDCCH order);

[0185] When the serving cell meets certain conditions (e.g., signal quality is below a certain threshold, similar to A2);

[0186] When the candidate cell meets certain conditions (for example, the signal quality is higher than a certain threshold, and / or the LTM triggering condition is not met).

[0187] Optionally, the LTM pre-switching request carries at least one of the following:

[0188] LTM candidate cell identification information indicates the cell where the terminal device may perform random access-free LTM handover;

[0189] The terminal device pre-switching estimated time information indicates the time information when the terminal device may perform random access-free LTM switching;

[0190] The validity period of the terminal device's pre-handover request (for example, it can be the remaining TA valid time, after which the terminal device will not perform random access);

[0191] Candidate cell SSB beam information and / or configuration grant occasion information (such as SSB index, which can be used to indicate the configuration grant occasion / candidate cell dynamic scheduling beam information selected by the terminal device);

[0192] Requests activated TCI status information.

[0193] Step 8: The current serving cell receives the LTM pre-switching request sent by the terminal device and notifies the user of the cell switch. Optionally, DU-CU CELL SWITCH NOTIFICATION and / or CU-DU CELL SWITCH NOTIFICATION) sends the LTM pre-switching request to the candidate cell. The candidate cell decides when to start or stop detecting the access / scheduling of the terminal device based on the LTM pre-switching request information (for example, the candidate cell starts after receiving the LTM pre-switching request, or starts when the terminal device's expected switching time arrives, and stops after the terminal device's expected switching request validity period expires).

[0194] Optionally, after receiving the LTM pre-switching request sent by the terminal device, the current serving cell sends a candidate cell (uplink) TCI state activation MAC CE to the terminal device (ie, the current serving cell confirms the candidate cell TCI state information).

[0195] Step 9: If the terminal device evaluates that the target candidate cell meets the LTM execution conditions and has a valid TA, the terminal device applies the candidate cell LTM configuration, uses CG (configuration grant) or dynamic grant (dynamic grant) to perform RACH-less LTM, and sends an RRC Reconfiguration Complete message to the candidate cell.

[0196] Step 10: The target candidate cell detects the terminal device access and receives the RRC Reconfiguration Complete message. It then sends an access success message to the gNB-CU. The gNB-CU then notifies other candidate cells to cancel the LTM pre-handover request.

[0197] First embodiment

[0198] 6 , which is a flow chart of a processing method according to a first embodiment of the present application, the processing method according to the embodiment of the present application may be applied to a network device (such as a base station), which may be a first network node, and includes the following steps:

[0199] S2: The first network node performs a first operation based on a first message sent by the terminal device.

[0200] The solution of this embodiment can support the terminal device to execute the random access free condition LTM. The terminal device requests to execute the random access free condition LTM by sending a first message to the network device for instruction.

[0201] Optionally, the network device receives a first message from the terminal device, and performs a first operation based on the first message sent by the terminal device.

[0202] Optionally, the network device may be a base station or a satellite, etc.

[0203] Optionally, the network device may be a first network node, and the first network node may be a network node where a current serving cell is located. The first network node interacts with the terminal device, the second network node, and the third network node to support the terminal device in executing the random access-free condition LTM, thereby reducing the handover delay.

[0204] Optionally, the second network node may be a network node where the candidate cell is located.

[0205] Optionally, the first network node may be a source gNB-DU, the second network node may be a candidate gNB-DU, the third network node may be a gNB-CU, and so on.

[0206] Optionally, the first message is used to instruct the terminal device to request execution of random access-free condition LTM.

[0207] Alternatively, the first message may be an LTM pre-switching request.

[0208] Optionally, the LTM pre-switching request is sent by the terminal device to the first network node through MAC CE.

[0209] Optionally, the terminal device initiates an LTM pre-switching request to the current serving cell via MAC CE, indicating that the terminal device may perform a random access-free conditional LTM switching on a candidate cell.

[0210] Optionally, the terminal device independently decides when to initiate the request.

[0211] Optionally, the terminal device initiates a request when the terminal device meets at least one of the following conditions:

[0212] When the candidate cell has a valid TA (can be obtained by UE-based TA measurement / PDCCH order);

[0213] When the serving cell meets certain conditions (e.g., signal quality is below a certain threshold, similar to A2);

[0214] When the candidate cell meets certain conditions (for example, the signal quality is higher than a certain threshold, and / or the LTM triggering condition is not met).

[0215] Optionally, the first message includes at least one of the following:

[0216] Conditional LTM candidate cell identification information;

[0217] Terminal equipment does not need random access switching time information;

[0218] The validity period of the random access-free handover request of the terminal device;

[0219] Conditional LTM candidate cell synchronization channel block beam information and / or configuration grant occasion;

[0220] Requests activated TCI status information.

[0221] Optionally, the LTM candidate cell identification information indicates a cell in which the terminal device may perform random access-free conditional LTM switching.

[0222] Optionally, the terminal device pre-switching estimated time information indicates the time information when the terminal device may perform random access-free conditional LTM switching.

[0223] Optionally, the valid time of the terminal device pre-switching request may be, for example, remaining TA valid time. After the timeout, the terminal device will not perform random access.

[0224] Optionally, the candidate cell SSB beam information and / or configuration authorization timing information (such as SSB index) can be used to indicate the configuration authorization timing / candidate cell dynamic scheduling beam information selected by the terminal device.

[0225] Optionally, the random access-free switching time information of the terminal device may be an estimated random access-free switching time of the terminal device.

[0226] Optionally, the first network node performs a first operation based on a first message sent by the terminal device.

[0227] Optionally, the first network node performs a first operation, including sending a cell switching notification to the candidate cell, and / or sending a TCI status information activation message to the terminal device.

[0228] Optionally, sending the cell switching notification to the candidate cell may be forwarding the cell switching notification to the candidate cell via the gNB-CU.

[0229] Optionally, the cell handover notification includes at least one of the following:

[0230] cell identification;

[0231] Random access-free handover request identifier;

[0232] Terminal equipment does not need random access switching time information;

[0233] The validity period of the random access-free handover request of the terminal device;

[0234] Synchronization channel block beam information and / or timing;

[0235] TCI status information.

[0236] The following describes this embodiment in detail with reference to the following scenarios:

[0237] As shown in FIG5 , the terminal device initiates an LTM pre-switching request to the current serving cell via a MAC CE, indicating that the terminal device may perform a RACH-less conditional LTM switching on a candidate cell.

[0238] The current serving cell receives the LTM pre-switching request sent by the terminal device, and sends the LTM pre-switching request to the candidate cell through the cell switching notification (such as DU-CU CELL SWITCH NOTIFICATION and / or CU-DU CELL SWITCH NOTIFICATION). The candidate cell decides when to start or stop detecting the terminal device access / scheduling based on the LTM pre-switching request (for example, the candidate cell starts after receiving the LTM pre-switching request, or starts when the terminal device is expected to switch at the time, and stops after the terminal device's expected switching request expires).

[0239] Optionally, after receiving the LTM pre-switching request sent by the terminal device, the current serving cell sends a candidate cell (uplink) TCI state activation MAC CE to the terminal device (ie, the current serving cell confirms the candidate cell TCI state information).

[0240] Optionally, if the terminal device evaluates that the target candidate cell meets the conditional LTM execution conditions and has a valid TA, the terminal device applies the candidate cell LTM configuration, uses configuration grant (CG) or dynamic grant (dynamic grant) to perform random access-free LTM, and sends an RRC Reconfiguration Complete message to the candidate cell.

[0241] The target candidate cell detects the terminal device access and receives the RRC Reconfiguration Complete message. It then sends an access success message to the gNB-CU. The gNB-CU then notifies other candidate cells to cancel the LTM pre-handover request.

[0242] Through the technical solution of this embodiment, the first network node performs the first operation based on the first message sent by the terminal device, which can support the terminal device to execute the random access-free condition LTM, thereby reducing the switching delay.

[0243] Second embodiment

[0244] Based on the first embodiment of the present application, a second embodiment of the present application is proposed. The second embodiment of the present application mainly explains the processing flow before the network device receives the first message sent by the terminal device.

[0245] The solution of this embodiment can support the terminal device to execute the random access free condition LTM. The terminal device requests to execute the random access free condition LTM by sending a first message to the network device for instruction.

[0246] Optionally, before the terminal device sends the first message to the network device, the network device performs a conditional LTM preparation process, that is, the network device decides to configure the conditional LTM and initiates the conditional LTM preparation process.

[0247] Optionally, the network device may be a base station or a satellite, etc.

[0248] Optionally, the network device includes a network node where the current serving cell is located and / or a network node where the candidate cell is located.

[0249] Optionally, the network node where the current serving cell is located is the first network node, and the first network node interacts with the terminal device and the network node where the candidate cell is located to support the terminal device to execute the random access-free condition LTM, thereby reducing the switching delay.

[0250] Optionally, after the network device decides to configure conditional LTM and initiates the conditional LTM preparation process, the first network node sends conditional LTM configuration information to the terminal device, where the conditional LTM configuration information includes: conditional LTM candidate cell configuration and subsequent conditional LTM execution conditions.

[0251] Optionally, the first network node sends conditional LTM configuration information to the terminal device. After receiving the conditional LTM configuration, the terminal device stores the conditional LTM configuration, starts to evaluate the LTM candidate cell execution conditions, and performs downlink synchronization between the terminal device and the LTM candidate cell.

[0252] Optionally, the first network node sends a PDCCH command to the terminal device, whereby the terminal device triggers an early TA acquisition scenario based on the PDCCH command.

[0253] Optionally, in an early TA acquisition scenario, the terminal device obtains the TA value of the candidate cell based on a PDCCH command sent by the first network node.

[0254] Optionally, the PDCCH command carries an identifier instructing the terminal device to send a CFRA with RAR to the candidate cell.

[0255] Optionally, the PDCCH command carries an identifier instructing the terminal device to monitor the RAR in the candidate cell after sending MSG1 in the candidate cell. Optionally, the RAR carries TA information of the candidate cell.

[0256] Optionally, the terminal device receives a PDCCH command sent by the first network node to trigger CFRA to perform early TA acquisition of the candidate cell. The terminal device sends MSG1 in the candidate cell. After receiving MSG1, the candidate cell sends TA information to the current serving cell. The current serving cell sends the TA information to the terminal device via MAC CE.

[0257] Optionally, when the network device is configured with UE-based TA measurement, the terminal device performs TA measurement on the candidate cell.

[0258] Optionally, the first network node receives a first message sent by the terminal device, where the first message instructs the terminal device to execute a random access-free condition LTM.

[0259] The following describes this embodiment in detail with reference to the following scenarios:

[0260] As shown in FIG5 , the technical solution of this embodiment includes:

[0261] Step 1: The network device decides to configure conditional LTM and initiates the conditional LTM preparation process.

[0262] Step 2: The network device (e.g., source gNB-DU) sends an RRC Reconfiguration message to the terminal device. The RRC Reconfiguration message includes the conditional LTM candidate cell configuration and the continuous conditional LTM execution condition. The terminal device stores the conditional LTM configuration.

[0263] Step 3: The UE sends an RRC Reconfiguration Complete message to the network device (e.g., source gNB-DU).

[0264] Step 4: The terminal device starts to evaluate the execution conditions of the LTM candidate cells.

[0265] Step 5: The terminal device and the LTM candidate cell perform downlink synchronization.

[0266] Step 6a: When UE-based TA measurement is configured, the UE obtains the TA value of the candidate cell through measurement.

[0267] Step 6b: PDCCH command triggers early TA acquisition scenario:

[0268] Scenario 1: The terminal device receives a PDCCH command from the source cell, triggering CFRA to perform early candidate cell acquisition. The PDCCH command carries an identifier instructing the terminal device to monitor the RAR in the candidate cell after sending MSG1. The RAR carries the candidate cell TA information.

[0269] Scenario 2: The terminal device receives a PDCCH command from the source cell, triggering CFRA to acquire candidate cells in advance. After receiving MSG1, the candidate cell sends the TA information to the current source cell, which then sends the TA information to the terminal device via MAC CE.

[0270] Step 7: The terminal device initiates an LTM pre-switching request to the current serving cell through MAC CE, indicating that the terminal device may perform RACH-less conditional LTM switching on a candidate cell.

[0271] The subsequent specific implementation process can refer to the first embodiment and will not be repeated here.

[0272] Through the technical solution of this embodiment, the first network node sends conditional LTM configuration information to the terminal device and sends a PDCCH command to the terminal device, receives the first message sent by the terminal device, and performs a first operation based on the first message sent by the terminal device, which can support the terminal device to perform random access-free conditional LTM, thereby reducing the switching delay.

[0273] Third embodiment

[0274] 7 , which is a flow chart of a processing method according to a third embodiment of the present application, the processing method according to the embodiment of the present application may be applied to a network device (such as a base station), which may be a second network node, and includes the following steps:

[0275] S3: The second network node receives a cell switching notification, which is sent by the first network node to the second network node based on the first message sent by the terminal device.

[0276] The solution of this embodiment can support the terminal device to execute the random access-free condition LTM.

[0277] The network system architecture involved in the solution of this embodiment includes: a first network node, a second network node and a third network node.

[0278] The first network node may be a network node where the current serving cell is located, and the second network node may be a network node where the candidate cell is located. The first network node interacts with the terminal device, the second network node, and the third network node to support the terminal device in executing the random access-free condition LTM, thereby reducing handover delay.

[0279] Optionally, the first network node may be a source gNB-DU, the second network node may be a candidate gNB-DU, the third network node may be a gNB-CU, and so on.

[0280] Optionally, the terminal device requests to execute the random access-free condition LTM by sending a first message to the first network node for instruction.

[0281] Optionally, the first network node receives a first message sent by the terminal device, and performs a first operation based on the first message sent by the terminal device.

[0282] Optionally, the first network node performs a first operation, including sending a cell switching notification to the candidate cell, and / or sending a TCI status information activation message to the terminal device.

[0283] Optionally, the second network node receives a cell switching notification sent by the first network node.

[0284] Optionally, the second network node obtains an LTM pre-switching request based on the cell switching notification sent by the first network node.

[0285] Optionally, the cell switching notification may be a DU-CU cell switching notification and / or a CU-DU cell switching notification.

[0286] Optionally, the cell handover notification is forwarded by the first network node to the second network node via the third network node.

[0287] Optionally, the cell switching notification includes at least one of the following:

[0288] cell identification;

[0289] Random access-free handover request identifier;

[0290] Terminal equipment does not need random access switching time information;

[0291] The validity period of the random access-free handover request of the terminal device;

[0292] Synchronization channel block beam information and / or timing;

[0293] TCI status information.

[0294] Optionally, the first message is used to instruct the terminal device to request execution of random access-free condition LTM.

[0295] Alternatively, the first message may be an LTM pre-switching request.

[0296] Optionally, the LTM pre-switching request is sent by the terminal device to the first network node through MAC CE.

[0297] Optionally, the terminal device initiates an LTM pre-switching request to the current serving cell via a MAC CE, indicating that the terminal device may perform a RACH-less conditional LTM switching on a certain candidate cell.

[0298] Optionally, in scenario 1, the terminal device independently decides when to initiate the request.

[0299] Optionally, in scenario 2, the terminal device initiates a request when the terminal device meets at least one of the following conditions:

[0300] When the candidate cell has a valid TA (can be obtained by UE-based TA measurement / PDCCH order);

[0301] When the serving cell meets certain conditions (e.g., signal quality is below a certain threshold, similar to A2);

[0302] When the candidate cell meets certain conditions (for example, the signal quality is higher than a certain threshold, and / or the LTM triggering condition is not met).

[0303] Optionally, the first message includes at least one of the following:

[0304] Conditional LTM candidate cell identification information;

[0305] Terminal equipment does not need random access switching time information;

[0306] The validity period of the random access-free handover request of the terminal device;

[0307] Conditional LTM candidate cell synchronization channel block beam information and / or timing;

[0308] Requests activated TCI status information.

[0309] Optionally, the LTM candidate cell identification information indicates a cell in which the terminal device may perform random access-free conditional LTM switching.

[0310] Optionally, the terminal device pre-switching estimated time information indicates the time information when the terminal device may perform random access-free conditional LTM switching.

[0311] Optionally, the valid duration of the terminal device pre-switching request may be, for example, a remaining TA valid time. After the timeout, the terminal device will not perform random access.

[0312] Optionally, the candidate cell SSB beam information and / or configuration authorization timing information (such as SSB index) can be used to indicate the configuration authorization timing / candidate cell dynamic scheduling beam information selected by the terminal device.

[0313] Optionally, the random access-free switching time information of the terminal device may be an estimated random access-free switching time of the terminal device.

[0314] Optionally, the second network node receives a second message sent by the terminal device based on a PDCCH command. Optionally, the second message is MSG1.

[0315] Optionally, the second network node sends the timing advance information of the second network node to the first network node based on the second message.

[0316] Optionally, the second network node sends the timing advance information of the second network node to the terminal device based on the second message (for example, through RAR).

[0317] Optionally, the second network node starts or stops detecting terminal device access or dynamic scheduling or configuration authorization based on the cell handover notification. For example, the second network node starts after receiving an LTM pre-handover request, or starts when the terminal device's expected handover time arrives, and stops after the terminal device's expected handover request validity period expires.

[0318] The following describes this embodiment in detail with reference to the following scenarios:

[0319] As shown in FIG5 , the technical solution of this embodiment includes:

[0320] Step 1: The network device decides to configure conditional LTM and initiates the conditional LTM preparation process.

[0321] Step 2: The network device (e.g., source gNB-DU) sends an RRC Reconfiguration message to the terminal device. The RRC Reconfiguration message includes the conditional LTM candidate cell configuration and the continuous conditional LTM execution condition. The terminal device stores the conditional LTM configuration.

[0322] Step 3: The UE sends an RRC Reconfiguration Complete message to the network device (e.g., source gNB-DU).

[0323] Step 4: The terminal device starts to evaluate the execution conditions of the LTM candidate cells.

[0324] Step 5: The terminal device and the LTM candidate cell perform downlink synchronization.

[0325] Step 6a: When UE-based TA measurement is configured, the UE obtains the TA value of the candidate cell through measurement.

[0326] Step 6b: PDCCH command triggers early TA acquisition scenario:

[0327] Scenario 1: The terminal device receives a PDCCH command from the source cell, triggering CFRA to perform early candidate cell acquisition. The PDCCH command carries an identifier instructing the terminal device to monitor the RAR in the candidate cell after sending MSG1. The RAR carries the candidate cell TA information.

[0328] Scenario 2: The terminal device receives a PDCCH command from the source cell, triggering CFRA to perform early candidate cell acquisition. After receiving MSG1, the candidate cell (such as the cell corresponding to the second network node) sends the TA information to the current source cell, and the current source cell sends the TA information to the terminal device via MAC CE.

[0329] Step 7: The terminal device initiates an LTM pre-switching request to the current serving cell through MAC CE, indicating that the terminal device may perform RACH-less conditional LTM switching on a candidate cell.

[0330] Step 8: The current serving cell receives the LTM pre-switching request sent by the terminal device, and sends the LTM pre-switching request to the candidate cell (such as the cell corresponding to the second network node) through a cell switching notification (such as DU-CU CELL SWITCH NOTIFICATION and / or CU-DU CELL SWITCH NOTIFICATION). The candidate cell decides when to start or stop detecting the access / scheduling of the terminal device based on the LTM pre-switching request information (for example, the candidate cell starts after receiving the LTM pre-switching request, or starts when the terminal device is expected to switch at the time, and stops after the terminal device's expected switching request expires).

[0331] Optionally, after receiving the LTM pre-switching request sent by the terminal device, the current serving cell sends a candidate cell (uplink) TCI state activation MAC CE to the terminal device (ie, the current serving cell confirms the candidate cell TCI state information).

[0332] Step 9: If the terminal device evaluates that the target candidate cell meets the conditional LTM execution conditions and has a valid TA, the terminal device applies the candidate cell LTM configuration, uses the configuration grant (CG) or dynamic grant (dynamic grant) to perform RACH-less LTM, and sends an RRC Reconfiguration Complete message to the candidate cell.

[0333] Step 10: The target candidate cell detects the terminal device access and receives the RRC Reconfiguration Complete message. It then sends an access success message to the gNB-CU. The gNB-CU then notifies other candidate cells to cancel the LTM pre-handover request.

[0334] The specific implementation process can refer to the above-mentioned relevant embodiments and will not be repeated here.

[0335] Through the technical solution of this embodiment, the second network node receives the cell switching notification, which is sent by the first network node to the second network node based on the first message sent by the terminal device. The first network node performs the first operation based on the first message sent by the terminal device, which can support the terminal device to execute the random access-free condition LTM, thereby reducing the switching delay.

[0336] Fourth embodiment

[0337] 8 , which is a flow chart of a processing method according to a fourth embodiment of the present application, the processing method according to the embodiment of the present application can be applied to a terminal device (such as a mobile phone), and includes the following steps:

[0338] S1: A terminal device sends a first message to enable a first network node to perform a first operation based on the first message.

[0339] This embodiment can support a terminal device to execute a random access-free conditional LTM. The terminal device requests to execute the random access-free conditional LTM by sending a first message to the network device. That is, the first message is used to instruct the terminal device to request to execute the random access-free conditional LTM.

[0340] Optionally, the terminal device sends a first message, the network device receives the first message from the terminal device, and performs a first operation based on the first message sent by the terminal device.

[0341] Optionally, the network device may be a base station or a satellite, etc.

[0342] Optionally, the network device may be a first network node, and the first network node may be a network node where a current serving cell is located. The first network node interacts with the terminal device, the second network node, and the third network node to support the terminal device in executing the random access-free condition LTM, thereby reducing the handover delay.

[0343] Optionally, the second network node may be a network node where the candidate cell is located.

[0344] Optionally, the first network node may be a source gNB-DU, the second network node may be a candidate gNB-DU, the third network node may be a gNB-CU, and so on.

[0345] Optionally, the first message includes at least one of the following:

[0346] Conditional LTM candidate cell identification information;

[0347] Terminal equipment does not need random access switching time information;

[0348] The validity period of the random access-free handover request of the terminal device;

[0349] Conditional LTM candidate cell synchronization channel block beam information and / or timing;

[0350] Requests activated TCI status information.

[0351] Optionally, the LTM candidate cell identification information indicates a cell in which the terminal device may perform random access-free conditional LTM switching.

[0352] Optionally, the terminal device pre-switching estimated time information indicates the time information when the terminal device may perform random access-free conditional LTM switching.

[0353] Optionally, the valid duration of the terminal device pre-switching request may be, for example, a remaining TA valid time. After the timeout, the terminal device will not perform random access.

[0354] Optionally, the candidate cell SSB beam information and / or configuration authorization timing information (such as SSB index) can be used to indicate the configuration authorization timing / candidate cell dynamic scheduling beam information selected by the terminal device.

[0355] Optionally, the random access-free switching time information of the terminal device may be an estimated random access-free switching time of the terminal device.

[0356] Alternatively, the first message may be an LTM pre-switching request.

[0357] Optionally, the LTM pre-switching request is sent by the terminal device to the first network node through MAC CE.

[0358] Optionally, the terminal device initiates an LTM pre-switching request to the current serving cell via MAC CE, indicating that the terminal device may perform a random access-free conditional LTM switching on a candidate cell.

[0359] Optionally, in scenario 1, the terminal device independently decides when to initiate the request.

[0360] Optionally, in scenario two, the terminal device must meet corresponding conditions to send the first message.

[0361] Optionally, the terminal device meets the conditions for sending the first message, including: the terminal device has a valid timing advance value for the candidate cell (which can be UE-based TA measurement / PDCCH order acquisition), the serving cell meets the first condition, and the candidate cell meets at least one of the second condition.

[0362] Optionally, satisfying the first condition includes that the signal quality is lower than a first threshold, similar to A2.

[0363] Optionally, satisfying the second condition includes that the signal quality is higher than a second threshold, and / or the LTM triggering condition is not satisfied.

[0364] Optionally, the first network node performs a first operation, including sending a cell switching notification to the candidate cell, and / or sending a TCI status information activation message to the terminal device.

[0365] Optionally, sending the cell switching notification to the candidate cell may be forwarding the cell switching notification to the candidate cell (second network node) through the gNB-CU (third network node).

[0366] Optionally, the cell switching notification includes at least one of the following:

[0367] cell identification;

[0368] Random access-free handover request identifier;

[0369] Free random access switching time information;

[0370] Random access-free handover request validity period;

[0371] Synchronization channel block beam information and / or timing;

[0372] TCI status information.

[0373] The following describes this embodiment in detail with reference to the following scenarios:

[0374] As shown in FIG5 , the terminal device initiates an LTM pre-switching request to the current serving cell via a MAC CE, indicating that the terminal device may perform a RACH-less conditional LTM switching on a candidate cell.

[0375] The current serving cell receives the LTM pre-switching request sent by the terminal device, and sends the LTM pre-switching request to the candidate cell through the cell switching notification (such as DU-CU CELL SWITCH NOTIFICATION and / or CU-DU CELL SWITCH NOTIFICATION). The candidate cell decides when to start or stop detecting the terminal device access / scheduling based on the LTM pre-switching request (for example, the candidate cell starts after receiving the LTM pre-switching request, or starts when the terminal device is expected to switch at the time, and stops after the terminal device's expected switching request expires).

[0376] Optionally, after receiving the LTM pre-switching request sent by the terminal device, the current serving cell sends a candidate cell (uplink) TCI state activation MAC CE to the terminal device (ie, the current serving cell confirms the candidate cell TCI state information).

[0377] Afterwards, the terminal device evaluates that the target candidate cell meets the conditional LTM execution conditions and has a valid TA, then the terminal device applies the candidate cell LTM configuration, uses configuration grant (CG) or dynamic grant (dynamic grant) to execute random access-free conditional LTM, and sends an RRC Reconfiguration Complete message to the candidate cell.

[0378] The target candidate cell detects the terminal device access and receives the RRC Reconfiguration Complete message. It then sends an access success message to the gNB-CU. The gNB-CU then notifies other candidate cells to cancel the LTM pre-handover request.

[0379] Optionally, before the terminal device sends the first message to the first network node, the method further includes at least one of the following:

[0380] The terminal device receives the conditional LTM configuration information sent by the first network node;

[0381] The terminal device receives a PDCCH command sent by the first network node;

[0382] The terminal device obtains the timing advance information of the candidate cell;

[0383] The terminal device receives the TCI status information activation message sent by the first network node.

[0384] Optionally, the terminal device obtains the timing advance information of the candidate cell, including at least one of the following:

[0385] The terminal device obtains the timing advance information of the candidate cell through measurement;

[0386] The terminal device obtains the timing advance information of the candidate cell from the RAR monitored by the candidate cell based on the PDCCH command;

[0387] The terminal device obtains timing advance information of the candidate cell from the first network node based on the PDCCH command, and the timing advance information is forwarded from the candidate cell by the first network node.

[0388] Optionally, the conditional LTM configuration information includes subsequent conditional LTM execution conditions and / or conditional LTM candidate cell configuration.

[0389] Optionally, the PDCCH command carries an identifier instructing the terminal device to send a CFRA with RAR to the candidate cell.

[0390] Optionally, after the network device decides to configure conditional LTM and initiates conditional LTM preparation, the first network node sends conditional LTM configuration information to the terminal device, where the conditional LTM configuration information includes: conditional LTM candidate cell configuration and subsequent conditional LTM execution conditions.

[0391] Optionally, the first network node sends conditional LTM configuration information to the terminal device. After receiving the conditional LTM configuration, the terminal device stores the conditional LTM configuration, starts evaluating LTM candidate cell execution conditions, and performs downlink synchronization between the terminal device and the LTM candidate cell.

[0392] Optionally, the first network node sends a PDCCH command to the terminal device, and the terminal device triggers an early TA acquisition scenario based on the PDCCH command.

[0393] Optionally, in an early TA acquisition scenario, the terminal device obtains the TA value of the candidate cell based on a PDCCH command sent by the first network node.

[0394] Optionally, the PDCCH command carries an identifier instructing the terminal device to send a CFRA with RAR to the candidate cell.

[0395] Optionally, the PDCCH command carries an identifier instructing the terminal device to monitor the RAR in the candidate cell after sending MSG1 in the candidate cell. Optionally, the RAR carries TA information of the candidate cell.

[0396] Optionally, the terminal device receives a PDCCH command sent by the first network node to trigger CFRA to perform early TA acquisition of the candidate cell. The terminal device sends MSG1 in the candidate cell. After receiving MSG1, the candidate cell sends TA information to the current serving cell. The current serving cell sends the TA information to the terminal device via MAC CE.

[0397] Optionally, when the network device is configured with UE-based TA measurement, the terminal device performs TA measurement on the candidate cell.

[0398] Optionally, the first network node receives a first message sent by the terminal device, where the first message instructs the terminal device to execute a random access-free condition LTM.

[0399] The following describes this embodiment in detail with reference to the following scenarios:

[0400] As shown in FIG5 , the process involved in this embodiment includes:

[0401] Step 1: The network device decides to configure conditional LTM and initiates the conditional LTM preparation process.

[0402] Step 2: The network device (e.g., source gNB-DU) sends an RRC Reconfiguration message to the terminal device. The RRC Reconfiguration message includes the conditional LTM candidate cell configuration and the continuous conditional LTM execution condition. The terminal device stores the conditional LTM configuration.

[0403] Step 3: The UE sends an RRC Reconfiguration Complete message to the network device (e.g., source gNB-DU).

[0404] Step 4: The terminal device starts to evaluate the execution conditions of the LTM candidate cells.

[0405] Step 5: The terminal device and the LTM candidate cell perform downlink synchronization.

[0406] Step 6a: When UE-based TA measurement is configured, the UE obtains the TA value of the candidate cell through measurement.

[0407] Step 6b: PDCCH command triggers early TA acquisition scenario:

[0408] Scenario 1: The terminal device receives a PDCCH command from the source cell, triggering CFRA to perform early candidate cell acquisition. The PDCCH command carries an identifier instructing the terminal device to monitor the RAR in the candidate cell after sending MSG1. The RAR carries the candidate cell TA information.

[0409] Scenario 2: The terminal device receives a PDCCH command from the source cell, triggering CFRA to acquire candidate cells in advance. After receiving MSG1, the candidate cell sends the TA information to the current source cell, which then sends the TA information to the terminal device via MAC CE.

[0410] Step 7: The terminal device initiates an LTM pre-switching request to the current serving cell through MAC CE, indicating that the terminal device may perform RACH-less conditional LTM switching on a candidate cell.

[0411] The subsequent specific implementation process can refer to the above embodiment and will not be repeated here.

[0412] Through the technical solution of this embodiment, the terminal device sends the first message to enable the first network node to perform the first operation based on the first message, which can support the terminal device to perform the random access-free condition LTM, thereby reducing the switching delay.

[0413] Fifth embodiment

[0414] 9 , which is a schematic diagram of an interaction flow between a network device and a terminal device according to a fifth embodiment of the present application, provides a processing method according to the fifth embodiment of the present application, including the following steps:

[0415] S1: The terminal device sends a first message, so that the first network node performs a first operation based on the first message;

[0416] S2: The first network node performs a first operation based on the first message sent by the terminal device;

[0417] S3: The second network node receives a cell switching notification, which is sent by the first network node to the second network node based on the first message sent by the terminal device.

[0418] The solution of this embodiment can support the terminal device to execute the random access-free condition LTM.

[0419] Optionally, the network device may be a base station or a satellite, etc.

[0420] Optionally, the network device includes a network node where the current serving cell is located and / or a network node where the candidate cell is located.

[0421] Optionally, the network node where the current serving cell is located is the first network node, and the first network node interacts with the terminal device, the second network node and the third network node to support the terminal device to execute the random access-free condition LTM, thereby reducing the switching delay.

[0422] Optionally, the second network node may be a network node where the candidate cell is located.

[0423] Optionally, the first network node may be a source gNB-DU, the second network node may be a candidate gNB-DU, the third network node may be a gNB-CU, and so on.

[0424] The terminal device requests to execute the random access free condition LTM by sending a first message to the network device. That is, the first message is used to instruct the terminal device to request to execute the random access free condition LTM.

[0425] Optionally, the terminal device sends a first message, the network device receives the first message from the terminal device, and performs a first operation based on the first message sent by the terminal device.

[0426] Optionally, the first message includes at least one of the following:

[0427] Conditional LTM candidate cell identification information;

[0428] Terminal equipment does not need random access switching time information;

[0429] The validity period of the random access-free handover request of the terminal device;

[0430] Conditional LTM candidate cell synchronization channel block beam information and / or timing;

[0431] Requests activated TCI status information.

[0432] Optionally, the LTM candidate cell identification information indicates a cell in which the terminal device may perform random access-free conditional LTM switching.

[0433] Optionally, the terminal device pre-switching estimated time information indicates the time information when the terminal device may perform random access-free conditional LTM switching.

[0434] Optionally, the valid time of the terminal device pre-switching request may be, for example, remaining TA valid time. After the timeout, the terminal device will not perform random access.

[0435] Optionally, the candidate cell SSB beam information and / or configuration authorization timing information (such as SSB index) can be used to indicate the configuration authorization timing / candidate cell dynamic scheduling beam information selected by the terminal device.

[0436] Optionally, the random access-free switching time information of the terminal device may be an estimated random access-free switching time of the terminal device.

[0437] Alternatively, the first message may be an LTM pre-switching request.

[0438] Optionally, the LTM pre-switching request is sent by the terminal device to the first network node through MAC CE.

[0439] Optionally, the terminal device initiates an LTM pre-switching request to the current serving cell via MAC CE, indicating that the terminal device may perform a random access-free conditional LTM switching on a candidate cell.

[0440] Optionally, in scenario 1, the terminal device independently decides when to initiate the request.

[0441] Optionally, in scenario two, the terminal device must meet corresponding conditions to send the first message.

[0442] Optionally, the terminal device meets the conditions for sending the first message, including: the terminal device has a valid timing advance value for the candidate cell (which can be UE-based TA measurement / PDCCH order acquisition), the serving cell meets the first condition, and the candidate cell meets at least one of the second condition.

[0443] Optionally, satisfying the first condition includes that the signal quality is lower than a first threshold, similar to A2.

[0444] Optionally, satisfying the second condition includes that the signal quality is higher than a second threshold, and / or the LTM triggering condition is not satisfied.

[0445] Optionally, the first network node performs a first operation, including sending a cell switching notification to the candidate cell, and / or sending a TCI status information activation message to the terminal device.

[0446] Optionally, the second network node receives a cell switching notification sent by the first network node.

[0447] Optionally, the second network node obtains an LTM pre-switching request based on the cell switching notification sent by the first network node.

[0448] Optionally, the cell switching notification may be a DU-CU cell switching notification and / or a CU-DU cell switching notification.

[0449] Optionally, the cell handover notification is forwarded by the first network node to the second network node via the third network node.

[0450] Optionally, the cell switching notification includes at least one of the following:

[0451] cell identification;

[0452] Random access-free handover request identifier;

[0453] Terminal equipment does not need random access switching time information;

[0454] The validity period of the random access-free handover request of the terminal device;

[0455] Synchronization channel block beam information and / or timing;

[0456] TCI status information.

[0457] Optionally, the second network node receives a second message sent by the terminal device based on a PDCCH command. Optionally, the second message is MSG1.

[0458] Optionally, the second network node sends the timing advance information of the second network node to the first network node based on the second message.

[0459] Optionally, the second network node sends the timing advance information of the second network node to the terminal device based on the second message (for example, through RAR).

[0460] Optionally, the second network node starts or stops detecting terminal device access or dynamic scheduling or configuration authorization based on the cell handover notification. For example, the second network node starts after receiving an LTM pre-handover request, or starts when the terminal device's expected handover time arrives, and stops after the terminal device's expected handover request validity period expires.

[0461] The following describes the technical solution of this embodiment in detail in combination with the scenario:

[0462] As shown in FIG5 , the terminal device initiates an LTM pre-switching request to the current serving cell via MAC CE, indicating that the terminal device may perform a random access-free conditional LTM switching on a candidate cell.

[0463] The current serving cell receives the LTM pre-switching request sent by the terminal device, and sends the LTM pre-switching request to the candidate cell (such as the serving cell corresponding to the second network node) through a cell switching notification (such as DU-CU CELL SWITCH NOTIFICATION and / or CU-DU CELL SWITCH NOTIFICATION). The candidate cell decides when to start or stop detecting terminal device access / scheduling based on the LTM pre-switching request (for example, the candidate cell starts after receiving the LTM pre-switching request, or starts when the terminal device is expected to switch at a certain time, and stops after the terminal device's expected switching request expires).

[0464] Optionally, after receiving the LTM pre-switching request sent by the terminal device, the current serving cell sends a candidate cell (uplink) TCI state activation MAC CE to the terminal device (ie, the current serving cell confirms the candidate cell TCI state information).

[0465] Optionally, if the terminal device evaluates that the target candidate cell meets the conditional LTM execution conditions and has a valid TA, the terminal device applies the candidate cell LTM configuration, uses configuration grant (CG) or dynamic grant (dynamic grant) to execute random access-free conditional LTM, and sends an RRC Reconfiguration Complete message to the candidate cell.

[0466] The target candidate cell detects the terminal device access and receives the RRC Reconfiguration Complete message. It then sends an access success message to the gNB-CU. The gNB-CU then notifies other candidate cells to cancel the LTM pre-handover request.

[0467] Optionally, before the terminal device sends the first message to the first network node, the method further includes at least one of the following:

[0468] The first network node sends conditional LTM configuration information to the terminal device, and the terminal device receives the conditional LTM configuration information sent by the first network node;

[0469] The first network node sends a PDCCH command to the terminal device, and the terminal device receives the PDCCH command sent by the first network node;

[0470] The terminal device obtains the timing advance information of the candidate cell;

[0471] The first network node sends a TCI status information activation message to the terminal device, and the terminal device receives the TCI status information activation message sent by the first network node.

[0472] Optionally, the terminal device obtains the timing advance information of the candidate cell, including at least one of the following:

[0473] The terminal device obtains the timing advance information of the candidate cell through measurement;

[0474] The terminal device obtains the timing advance information of the candidate cell from the RAR monitored by the candidate cell based on the PDCCH command;

[0475] The terminal device obtains timing advance information of the candidate cell from the first network node based on the PDCCH command, and the timing advance information is forwarded from the candidate cell by the first network node.

[0476] Optionally, the conditional LTM configuration information includes subsequent conditional LTM execution conditions and / or conditional LTM candidate cell configuration.

[0477] Optionally, the PDCCH command carries an identifier instructing the terminal device to send a CFRA with RAR to the candidate cell.

[0478] Optionally, after the network device decides to configure conditional LTM and initiates conditional LTM preparation, the first network node sends conditional LTM configuration information to the terminal device, where the conditional LTM configuration information includes: conditional LTM candidate cell configuration and subsequent conditional LTM execution conditions.

[0479] Optionally, the first network node sends conditional LTM configuration information to the terminal device. After receiving the conditional LTM configuration, the terminal device stores the conditional LTM configuration, starts to evaluate the LTM candidate cell execution conditions, and performs downlink synchronization between the terminal device and the LTM candidate cell.

[0480] Optionally, the first network node sends a PDCCH command to the terminal device, and the terminal device triggers an early TA acquisition scenario based on the PDCCH command.

[0481] Optionally, in an early TA acquisition scenario, the terminal device obtains the TA value of the candidate cell based on a PDCCH command sent by the first network node.

[0482] Optionally, the PDCCH command carries an identifier instructing the terminal device to send a CFRA with RAR to the candidate cell.

[0483] Optionally, the PDCCH command carries an identifier instructing the terminal device to monitor the RAR in the candidate cell after sending MSG1 in the candidate cell. Optionally, the RAR carries TA information of the candidate cell.

[0484] Optionally, the terminal device receives a PDCCH command sent by the first network node to trigger CFRA to perform early TA acquisition of the candidate cell. The terminal device sends MSG1 in the candidate cell. After receiving MSG1, the candidate cell sends TA information to the current serving cell. The current serving cell sends the TA information to the terminal device via MAC CE.

[0485] Optionally, when the network device is configured with UE-based TA measurement, the terminal device performs TA measurement on the candidate cell.

[0486] Optionally, the first network node receives a first message sent by the terminal device, where the first message instructs the terminal device to execute a random access-free condition LTM.

[0487] The following describes this embodiment in detail with reference to the following scenarios:

[0488] As shown in FIG5 , the process involved in this embodiment includes:

[0489] Step 1: The network device decides to configure conditional LTM and initiates the conditional LTM preparation process.

[0490] Step 2: The network device (e.g., source gNB-DU) sends an RRC Reconfiguration message to the terminal device. The RRC Reconfiguration message includes the conditional LTM candidate cell configuration and the continuous conditional LTM execution condition. The terminal device stores the conditional LTM configuration.

[0491] Step 3: The UE sends an RRC Reconfiguration Complete message to the network device (e.g., source gNB-DU).

[0492] Step 4: The terminal device starts to evaluate the execution conditions of the LTM candidate cells.

[0493] Step 5: The terminal device and the LTM candidate cell perform downlink synchronization.

[0494] Step 6a: When UE-based TA measurement is configured, the UE obtains the TA value of the candidate cell through measurement.

[0495] Step 6b: PDCCH command triggers early TA acquisition scenario:

[0496] Scenario 1: The terminal device receives a PDCCH command from the source cell, triggering CFRA to perform early candidate cell acquisition. The PDCCH command carries an identifier instructing the terminal device to monitor the RAR in the candidate cell after sending MSG1. The RAR carries the candidate cell TA information.

[0497] Scenario 2: The terminal device receives a PDCCH command from the source cell, triggering CFRA to acquire candidate cells in advance. After receiving MSG1, the candidate cell sends the TA information to the current source cell, which then sends the TA information to the terminal device via MAC CE.

[0498] Step 7: The terminal device initiates an LTM pre-switching request to the current serving cell through MAC CE, indicating that the terminal device may perform RACH-less conditional LTM switching on a candidate cell.

[0499] The subsequent specific implementation process can refer to the above embodiment and will not be repeated here.

[0500] Through the technical solution of this embodiment, the terminal device sends a first message, the first network node performs a first operation based on the first message, and the second network node receives a cell switching notification, which can support the terminal device to execute the random access-free condition LTM, thereby reducing the switching delay.

[0501] Sixth embodiment

[0502] Please refer to Figure 10, which is a schematic diagram of the structure of the processing device provided in an embodiment of the present application. The device can be installed in or is the network device (such as the first network node) in the above method embodiment. As shown in Figure 10, the device 150 includes:

[0503] The execution module 1501 is configured to execute a first operation based on a first message sent by a terminal device.

[0504] Optionally, the first message is used to instruct the terminal device to request execution of random access-free condition LTM.

[0505] Optionally, the first message includes at least one of the following:

[0506] Conditional LTM candidate cell identification information;

[0507] Terminal equipment does not need random access switching time information;

[0508] The validity period of the random access-free handover request of the terminal device;

[0509] Conditional LTM candidate cell synchronization channel block beam information and / or timing;

[0510] Requests activated TCI status information.

[0511] Optionally, performing a first operation includes at least one of the following:

[0512] Sending a cell switching notification to the candidate cell;

[0513] Send TCI status information activation message to the terminal device.

[0514] Optionally, the cell handover notification includes at least one of the following:

[0515] cell identification;

[0516] Random access-free handover request identifier;

[0517] Terminal equipment does not need random access switching time information;

[0518] The validity period of the random access-free handover request of the terminal device;

[0519] Synchronization channel block beam information and / or timing;

[0520] TCI status information.

[0521] Optionally, the device further comprises at least one of the following:

[0522] Send conditional LTM configuration information to terminal devices;

[0523] Send a PDCCH command to the terminal device.

[0524] Optionally, the conditional LTM configuration information includes subsequent conditional LTM execution conditions and / or conditional LTM candidate cell configuration.

[0525] Optionally, the PDCCH command carries an identifier instructing the terminal device to send a CFRA with RAR to the candidate cell.

[0526] The processing device provided in the embodiment of the present application has similar implementation principles and beneficial effects to the technical solutions shown in the above-mentioned corresponding method embodiments, and will not be described in detail here.

[0527] Seventh embodiment

[0528] Please refer to Figure 11, which is a second structural diagram of a processing device provided in an embodiment of the present application. The device can be installed in or is the network device (such as the second network node) in the above method embodiment. As shown in Figure 11, the device 160 includes:

[0529] The receiving module 1601 is configured to receive a cell switching notification, where the cell switching notification is sent by the first network node to the second network node based on a first message sent by a terminal device.

[0530] Optionally, the cell handover notification is forwarded by the first network node to the second network node via the third network node.

[0531] Optionally, the first message is used to instruct the terminal device to request execution of random access-free condition LTM.

[0532] Optionally, the first message includes at least one of the following:

[0533] Conditional LTM candidate cell identification information;

[0534] Terminal equipment does not need random access switching time information;

[0535] The validity period of the random access-free handover request of the terminal device;

[0536] Conditional LTM candidate cell synchronization channel block beam information and / or timing;

[0537] Requests activated TCI status information.

[0538] Optionally, the cell switching notification includes at least one of the following:

[0539] cell identification;

[0540] Random access-free handover request identifier;

[0541] Terminal equipment does not need random access switching time information;

[0542] The validity period of the random access-free handover request of the terminal device;

[0543] Synchronization channel block beam information and / or timing;

[0544] TCI status information.

[0545] Optionally, the device further comprises at least one of the following:

[0546] Receiving a second message sent by the terminal device based on the PDCCH command;

[0547] sending the timing advance information of the second network node to the first network node based on the second message;

[0548] Start or stop detecting terminal device access or dynamic scheduling or configuration authorization based on cell switching notification.

[0549] The processing device provided in the embodiment of the present application has similar implementation principles and beneficial effects to the technical solutions shown in the above-mentioned corresponding method embodiments, and will not be described in detail here.

[0550] Eighth embodiment

[0551] Please refer to Figure 12, which is a third structural diagram of a processing device provided in an embodiment of the present application. The device can be installed in or is the terminal device in the above method embodiment. As shown in Figure 12, the device 170 includes:

[0552] The sending module 1701 is configured to send a first message, so that a first network node performs a first operation based on the first message.

[0553] Optionally, the first message is used to instruct the terminal device to request execution of random access-free condition LTM.

[0554] Optionally, the first message includes at least one of the following:

[0555] Conditional LTM candidate cell identification information;

[0556] Free random access switching time information;

[0557] Random access-free handover request validity period;

[0558] Conditional LTM candidate cell synchronization channel block beam information and / or timing;

[0559] Requests activated TCI status information.

[0560] Optionally, the conditions for sending the first message include: the terminal device has a valid timing advance value for the candidate cell, the serving cell satisfies the first condition, and the candidate cell satisfies at least one of the second condition.

[0561] Optionally, the first network node performing the first operation includes at least one of the following:

[0562] The first network node sends a cell handover notification to the candidate cell;

[0563] The first network node sends a TCI status information activation message to the terminal device.

[0564] Optionally, satisfying the first condition includes that signal quality is lower than a first threshold.

[0565] Optionally, satisfying the second condition includes that the signal quality is higher than a second threshold, and / or the LTM triggering condition is not satisfied.

[0566] Optionally, the cell switching notification includes at least one of the following:

[0567] cell identification;

[0568] Random access-free handover request identifier;

[0569] Free random access switching time information;

[0570] Random access-free handover request validity period;

[0571] Synchronization channel block beam information and / or timing;

[0572] TCI status information.

[0573] Optionally, the device further comprises at least one of the following:

[0574] receiving conditional LTM configuration information sent by the first network node;

[0575] receiving a PDCCH command sent by the first network node;

[0576] Obtain timing advance information of candidate cells;

[0577] receiving a TCI status information activation message sent by the first network node;

[0578] Perform random access-free conditional LTM.

[0579] Optionally, obtaining the timing advance information of the candidate cell includes at least one of the following:

[0580] Obtain timing advance information of candidate cells through measurement;

[0581] Obtain timing advance information of the candidate cell from the RAR monitored by the candidate cell based on the PDCCH command;

[0582] Timing advance information of the candidate cell is obtained from the first network node based on a PDCCH command, the timing advance information being forwarded from the candidate cell by the first network node.

[0583] Optionally, the conditional LTM configuration information includes subsequent conditional LTM execution conditions and / or conditional LTM candidate cell configuration.

[0584] Optionally, the PDCCH command carries an identifier instructing the terminal device to send a CFRA with RAR to the candidate cell.

[0585] The processing device provided in the embodiment of the present application has similar implementation principles and beneficial effects to the technical solutions shown in the above-mentioned corresponding method embodiments, and will not be described in detail here.

[0586] Refer to Figure 13, which is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. As shown in Figure 13, the communication device 180 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 180 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.

[0587] The communication device 180 may include one or more processors 1801, also referred to as processing units, which may implement certain control or processing functions. Processor 1801 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.

[0588] Optionally, the processor 1801 may also store instructions 1803 or data (eg, intermediate data). Optionally, the instructions 1803 may be executed by the processor 1801, so that the communication device 180 executes the method corresponding to the terminal device or network device described in the above method embodiment.

[0589] Optionally, the communication device 180 may include a circuit that can implement the functions of sending, receiving, or communicating in the aforementioned method embodiments.

[0590] Optionally, the communication device 180 may include one or more memories 1802 , on which instructions 1804 may be stored. The instructions may be executed on the processor 1801 , so that the communication device 180 performs the method described in the above method embodiment.

[0591] Optionally, data may also be stored in the memory 1802. The processor 1801 and the memory 1802 may be provided separately or integrated together.

[0592] Optionally, the communication device 180 may further include a transceiver 1805 and / or an antenna 1806. The processor 1801 may be referred to as a processing unit, and controls the communication device 180 (terminal device, core network device, or wireless access network device). The transceiver 1805 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 180.

[0593] Optionally, if the communication device 180 is used to implement operations corresponding to the terminal device in the above embodiments, for example, the first message can be sent by the transceiver 1805.

[0594] Optionally, the specific implementation process of the processor 1801 and the transceiver 1805 can be found in the relevant descriptions of the above embodiments, and will not be repeated here.

[0595] Optionally, if the communication device 180 is used to implement operations corresponding to the network devices in the above embodiments, for example, the transceiver 1805 may receive the first message.

[0596] Optionally, the specific implementation process of the processor 1801 and the transceiver 1805 can be found in the relevant descriptions of the above embodiments, and will not be repeated here.

[0597] The processor 1801 and transceiver 1805 described in this application can 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 1801 and transceiver 1805 can 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.

[0598] In this application, a communication device may be a terminal device (such as a mobile phone) or a network device (such as a base station), 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.

[0599] 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 13. The communication device may be an independent device or may be part of a larger device.

[0600] An embodiment of the present application also 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, such as a first network node, a second network node, and a third network node.

[0601] An embodiment of the present application also provides a communication device, including a memory and a processor, wherein a processing program is stored in the memory, and when the processing program is executed by the processor, the steps of the processing method in any of the above embodiments are implemented.

[0602] The communication device in this application can be a terminal device (such as a mobile phone) or a network device (such as a base station). The specific reference needs to be clarified based on the context.

[0603] An embodiment of the present application further provides a computer-readable storage medium, on which a processing program is stored. When the processing program is executed by a processor, the steps of the processing method in any of the above embodiments are implemented.

[0604] 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 processing method embodiments may be included. The expansion and explanation content of the specification are basically the same as those of the embodiments of the above-mentioned methods, and will not be repeated here.

[0605] 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.

[0606] 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.

[0607] 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.

[0608] 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.

[0609] The steps in the method of the embodiment of the present application can be adjusted in order, combined and deleted according to actual needs.

[0610] The units in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0611] 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.

[0612] 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.

[0613] 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.

[0614] 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.

[0615] 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)).

[0616] 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 processing method, wherein: Applied to a first network node, comprising the steps of: A first operation is performed based on a first message sent by the terminal device.

2. The method according to claim 1, wherein: The first message is used to indicate that the terminal device requests to perform a random access free condition LTM; and / or the first message includes at least one of the following: Conditional LTM candidate cell identification information; Terminal equipment does not need random access switching time information; The validity period of the random access-free handover request of the terminal device; Conditional LTM candidate cell synchronization channel block beam information and / or timing; Requests activated TCI status information.

3. The method according to claim 2, wherein: Perform a first operation, including at least one of the following: Sending a cell switching notification to a candidate cell; Send TCI status information activation message to the terminal device.

4. The method according to claim 3, wherein: The cell switching notification includes at least one of the following: Cell ID; Random access free handover request flag; Terminal equipment does not need random access switching time information; The validity period of the random access-free handover request of the terminal device; Sync channel block beam information and / or timing; TCI status information.

5. The method according to claim 1, wherein: Also includes at least one of the following: Send conditional LTM configuration information to terminal devices; Send a PDCCH command to the terminal device.

6. The method according to claim 5, wherein: Also includes at least one of the following: The conditional LTM configuration information includes subsequent conditional LTM execution conditions and / or conditional LTM candidate cell configuration; The PDCCH command carries an identifier instructing the terminal device to send a CFRA with RAR to the candidate cell.

7. A processing method, wherein: Applied to a second network node, comprising the steps of: A cell switching notification is received, where the cell switching notification is sent by the first network node to the second network node based on a first message sent by the terminal device.

8. The method according to claim 7, wherein: Also includes at least one of the following: The cell switching notification is forwarded by the first network node to the second network node via the third network node; The first message is used to instruct the terminal device to request to execute the random access free condition LTM; The first message includes at least one of the following: Conditional LTM candidate cell identification information; Terminal equipment does not need random access switching time information; The validity period of the random access-free handover request of the terminal device; Conditional LTM candidate cell synchronization channel block beam information and / or timing; Requests activated TCI status information.

9. The method according to claim 8, wherein: The cell switching notification includes at least one of the following: Cell ID; Random access free handover request flag; Terminal equipment does not need random access switching time information; The validity period of the random access-free handover request of the terminal device; Sync channel block beam information and / or timing; TCI status information.

10. The method according to claim 7, wherein: Also includes at least one of the following: Receiving a second message sent by the terminal device based on the PDCCH command; sending the timing advance information of the second network node to the first network node based on the second message; Start or stop detecting terminal device access or dynamic scheduling or configuration authorization based on cell switching notification.

11. A processing method, wherein: Applied to terminal equipment, including the steps of: A first message is sent to cause the first network node to perform a first operation based on the first message.

12. The method according to claim 11, wherein: The first message is used to indicate that the terminal device requests to perform a random access free condition LTM; and / or the first message includes at least one of the following: Conditional LTM candidate cell identification information; Free random access switching time information; Random access-free switching request validity period; Conditional LTM candidate cell synchronization channel block beam information and / or timing; Requests activated TCI status information.

13. The method according to claim 11, wherein: Also includes at least one of the following: The condition for sending the first message includes: the terminal device has a valid timing advance value for the candidate cell, the serving cell satisfies the first condition, and the candidate cell satisfies at least one of the second condition; The first network node performing the first operation includes at least one of the following: The first network node sends a cell switching notification to the candidate cell; The first network node sends a TCI status information activation message to the terminal device.

14. The method according to claim 13, wherein: Also includes at least one of the following: Meeting the first condition includes signal quality being lower than a first threshold; Meeting the second condition includes the signal quality being higher than a second threshold, and / or the conditional LTM trigger condition not being met; The cell switching notification includes at least one of the following: Cell ID; Random access free handover request flag; Free random access switching time information; Random access-free switching request validity period; Sync channel block beam information and / or timing; TCI status information.

15. The method according to claim 11, wherein: Also includes at least one of the following: Receiving conditional LTM configuration information sent by the first network node; receiving a PDCCH command sent by the first network node; Obtain timing advance information of candidate cells; Receiving a TCI status information activation message sent by the first network node; Perform random access-free conditional LTM.

16. The method according to claim 15, wherein: Obtaining timing advance information of a candidate cell includes at least one of the following: Acquire timing advance information of candidate cells through measurement; Obtain timing advance information of the candidate cell from the RAR monitored by the candidate cell based on the PDCCH command; Timing advance information of the candidate cell is obtained from the first network node based on the PDCCH command, the timing advance information being forwarded from the candidate cell by the first network node.

17. The method according to claim 15, wherein: Also includes at least one of the following: The conditional LTM configuration information includes subsequent conditional LTM execution conditions and / or conditional LTM candidate cell configuration; The PDCCH command carries an identifier instructing the terminal device to send a CFRA with RAR to the candidate cell.

18. A communication device, wherein: include: A memory and a processor, wherein a processing program is stored in the memory, and when the processing program is executed by the processor, the processing method according to claim 1, 7 or 11 is implemented.

19. A computer-readable storage medium, wherein: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processing method according to claim 1, 7 or 11 is implemented.

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