WO2024011428A1

WO2024011428A1 - Cell handover method, communication device and storage medium

Info

Publication number: WO2024011428A1
Application number: PCT/CN2022/105287
Authority: WO
Inventors: 黄钧蔚
Original assignee: 深圳传音控股股份有限公司
Priority date: 2022-07-12
Filing date: 2022-07-12
Publication date: 2024-01-18

Abstract

Provided in the present application are a cell handover method, a communication device and a storage medium. The cell handover method comprises: a terminal receiving configuration signaling, and determining a timing advance of a target cell on the basis of the configuration signaling; and establishing non-random access with the target cell on the basis of the timing advance of the target cell. In this embodiment, when performing cell handover, a terminal can obtain a timing advance of a target cell on the basis of received configuration information, such that cell handover is realized by means of non-random access, thereby avoiding the signaling overhead caused during a random access process, the load of a network device can be reduced, and the network communication quality can be improved.

Description

Cell switching method, communication equipment and storage medium

Technical field

This application relates to the field of communication technology, and specifically to a cell switching method, communication equipment and storage media.

Background technique

In some implementations, the network device provides one or more network cells with network signal coverage, and the terminal accesses the corresponding cell based on its own location to implement communication with the network device. When the location of the terminal changes, it may cause the connected network cell to change, that is, cell switching.

During the process of conceiving and implementing this application, the inventor found that there are at least the following problems: in a non-terrestrial communication scenario, when a terminal switches between cells, it needs to obtain the TA of the target cell through random access, so as to switch to the target cell. . The random access process in this technical solution will increase signaling overhead and affect communication quality.

The preceding description is intended to provide general background information and does not necessarily constitute prior art.

Application content

In order to solve the above technical problems, this application provides a cell switching method, communication equipment and storage medium, which avoids signaling overhead caused by the random access process, reduces the load of network equipment, and improves network communication quality.

This application provides a cell switching method, which can be applied to terminals (such as mobile phones). The method includes the following steps:

S1: Determine the time advance of the target cell based on configuration signaling;

S2: Based on the time advance, establish non-random access with the target cell.

Optionally, the method further includes at least one of the following: the configuration signaling is a radio resource control reconfiguration or a media access control layer control unit; the target cell is a non-terrestrial cell or a terrestrial cell; the target cell The time advance is based on at least one confirmation of terminal location information, neighboring cell ephemeris parameters and source cell ephemeris parameters.

Optionally, the configuration signaling includes ephemeris parameters of neighboring cells, and step S1 includes: determining the time advance based on the ephemeris parameters and location information.

Optionally, step S2 further includes: synchronizing with the target cell; after successful synchronization, sending uplink control to the target cell based on the time advance of the target cell and/or the physical layer parameters of the target cell. information, and/or receive downlink control information sent by the target cell.

Optionally, the method further includes at least one of the following: the configuration signaling also includes a valid period of time advance; when the configuration signaling includes the first switching for instructing the terminal to perform cell switching with time-based conditional switching When the configuration signaling includes information, the configuration signaling also includes a first moment and/or a second moment; when the configuration signaling includes a third moment for instructing the terminal to perform cell switching with location-based condition switching, or instructing the terminal to perform cell switching with switching. When switching information, the configuration signaling also includes a valid interval.

Optionally, the method further includes at least one of the following: the location information of the terminal includes the global positioning navigation system position of the terminal; the ephemeris parameter includes at least one of the following: the spatial position of the cell corresponding to the earth, and the speed of the cell corresponding to the earth. , the cell corresponds to the orbital parameters of the earth.

This application also provides a cell switching method, which can be applied to terminals (such as mobile phones). The method includes the following steps:

S10: Based on the preset parameters, establish non-random access with the target cell.

Optionally, the method further includes at least one of the following: the preset parameters include at least one of location information, neighboring cell ephemeris parameters and source cell ephemeris parameters; the target cell is a non-terrestrial cell or a terrestrial cell. community.

Optionally, the neighbor cell ephemeris parameters and/or the source cell ephemeris parameters are determined by configuration signaling.

Optionally, the method further includes at least one of the following: the configuration signaling also includes a valid period of time advance; when the configuration signaling includes a first switching for instructing the terminal to perform cell switching in a time-based conditional switching When the configuration signaling includes information, the configuration signaling also includes a first moment and/or a second moment; when the configuration signaling includes a third moment for instructing the terminal to perform cell switching with location-based condition switching, or instructing the terminal to perform cell switching with switching. When switching information, the configuration signaling also includes a valid interval.

Optionally, step S10 includes: confirming a time advance based on preset parameters, and establishing non-random access with the target cell based on the time advance.

Optionally, the method further includes: synchronizing with the target cell; after successful synchronization, sending uplink control information to the target cell based on the time advance of the target cell and/or the physical layer parameters of the target cell, and/or receive downlink control information sent by the target cell.

This application also provides a cell switching method, which can be applied to network equipment (such as base stations). The method includes:

Send configuration signaling, so that the terminal determines the time advance of the target cell through the configuration signaling, and establishes non-random access with the target cell based on the time advance of the target cell.

Optionally, the configuration signaling includes the timing advance of the target cell, and the method further includes: determining the timing advance of the target cell based on the ephemeris parameter of the neighboring cell and the location information of the terminal.

Optionally, establishing non-random access with the target cell based on the time advance of the target cell includes: synchronizing the terminal with the target cell; after the synchronization is successful, based on the time advance of the target cell and/or target cell physical layer parameters, sending uplink control information to the target cell, and/or receiving downlink control information sent by the target cell.

Optionally, the method further includes at least one of the following: the location information of the terminal includes the global navigation satellite system position of the terminal; the ephemeris parameter includes at least one of the following: the spatial position of the cell corresponding to the earth, and the speed of the cell corresponding to the earth. , the cell corresponds to the orbital parameters of the earth.

The present application also provides a communication device, including: a memory and a processor, wherein a cell switching program is stored on the memory, and when the cell switching program is executed by the processor, any one of the above cell switching methods is implemented. step.

Optionally, the communication device in this application can be a terminal (such as a mobile phone) or a network device (such as a base station). The specific meaning needs to be determined based on the context.

This application also provides a computer-readable storage medium, the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of any of the above cell switching methods are implemented.

As mentioned above, with the cell switching method, communication equipment and storage medium provided by this application, the terminal can receive configuration signaling and determine the time advance of the target cell based on the configuration signaling; based on the time advance of the target cell, and the target cell Establish no random access. In this implementation, when performing cell switching, the terminal can obtain the time advance of the target cell based on the received configuration information, thereby realizing cell switching without random access and avoiding the signal loss caused by the random access process. The overhead can be reduced, which can reduce the load of network equipment and improve the quality of network communication.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to describe the embodiments. Obviously, for those of ordinary skill in the art, without exerting creative labor, Under the premise, other drawings can also be obtained based on these drawings.

Figure 1 is a schematic diagram of the hardware structure of a mobile terminal that implements various embodiments of the present application;

Figure 2 is a communication network system architecture diagram provided by an embodiment of the present application;

Figure 3A is a signaling diagram of a cell handover based on HO technology;

Figure 3B is a signaling diagram of cell handover based on CHO technology;

Figure 4 is an exemplary signaling diagram for performing a random access process;

Figure 5 is another exemplary signaling diagram for performing a random access process;

Figure 6 is a signaling interaction diagram of the cell switching method shown in the first exemplary embodiment of the present application;

Figure 7 is a signaling interaction diagram of the cell switching method shown in the second exemplary embodiment of the present application;

Figure 8 is a signaling interaction diagram of the cell switching method illustrated in the third exemplary embodiment of the present application;

Figure 9 is a schematic diagram of a neighboring cell exemplarily shown in this application;

Figure 10 is a signaling interaction diagram of the cell switching method shown in the fourth exemplary embodiment of the present application;

Figure 11 is a schematic diagram of configuration signaling provided by an embodiment of the present application;

Figure 12 is a signaling interaction diagram of the cell switching method illustrated in the fifth exemplary embodiment of the present application;

Figure 13 is a signaling interaction diagram of the cell switching method shown in the sixth exemplary embodiment of the present application;

Figure 14 is a signaling interaction diagram of the cell switching method shown in the seventh exemplary embodiment of the present application;

Figure 15 is a signaling interaction diagram of the cell switching method shown in the sixth exemplary embodiment of the present application;

Figure 16 is a schematic flowchart of obtaining the timing advance of a target cell provided by an embodiment of the present application;

Figure 17 is a signaling interaction diagram of the cell switching method shown in the seventh exemplary embodiment of the present application;

Figure 18 is a signaling interaction diagram of the cell switching method shown in the eighth exemplary embodiment of the present application;

Figure 19 is a signaling interaction diagram of the cell switching method shown in the ninth exemplary embodiment of the present application;

Figure 20 is a signaling interaction diagram of the cell switching method shown in the tenth exemplary embodiment of the present application;

Figure 21 is a signaling interaction diagram of the cell switching method shown in the eleventh exemplary embodiment of the present application;

Figure 22 is a schematic structural diagram of a cell switching device provided by an embodiment of the present application;

Figure 23 is a schematic structural diagram of a cell switching device provided by an embodiment of the present application;

Figure 24 is a schematic structural diagram of a cell switching device provided by an embodiment of the present application;

Figure 25 is a structural diagram of a communication device shown in an exemplary embodiment of the present application;

The realization of the purpose, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. Through the above-mentioned drawings, clear embodiments of the present application have been shown, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present application's concepts in any way, but are intended to illustrate the application's concepts for those skilled in the art with reference to specific embodiments.

Detailed ways

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the appended claims.

It should be noted that, in this document, the terms "comprising", "comprises" or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or device that includes a series of elements not only includes those elements, It also includes other elements not expressly listed or inherent in the process, method, article or apparatus. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, the application may be implemented differently. Components, features, and elements with the same names in the examples may have the same meaning or may have different meanings. Their specific meanings need to be determined based on their interpretation in the specific embodiment or further combined with the context of the specific embodiment.

It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, the information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this article, the first information may also be called second information, and similarly, the second information may also be called first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "when" or "in response to determining." 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 stated features, steps, operations, elements, components, items, categories, and/or groups, but do not exclude one or more other features, steps, operations, The presence, occurrence, or addition of elements, components, items, categories, and/or groups. The terms "or", "and/or", "including at least one of the following", etc. used in this application may be interpreted as inclusive or mean any one or any combination. For example, "including 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"; another example is, " 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". Exceptions to this definition occur only when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some manner.

It should be understood that although each step in the flow chart in the embodiment of the present application is displayed in sequence as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated in this article, the execution of these steps is not strictly limited in order, and they can be executed in other orders. Moreover, at least some of the steps in the figure may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but may be executed at different times, and their execution order is not necessarily sequential. may be performed in turn or alternately with other steps or sub-steps of other steps or at least part of stages.

Depending on the context, the words "if" or "if" as used herein may be interpreted as "when" or "when" or "in response to determination" or "in response to detection." Similarly, depending on the context, the phrase "if determined" or "if (stated condition or event) is detected" may be interpreted as "when determined" or "in response to determining" or "when (stated condition or event) is detected )" or "in response to detecting (a stated condition or event)".

It should be noted that in this article, step codes such as S11 and S12 are used for the purpose of describing the corresponding content more clearly and concisely, and do not constitute a substantial restriction on the sequence. Those skilled in the art may S12 will be executed first and then S11, etc., but these should be within the protection scope of this application.

It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

In the subsequent description, the use of suffixes such as "module", "component" or "unit" used to represent elements is only to facilitate the description of the present application and has no specific meaning in itself. Therefore, "module", "component" or "unit" may be used interchangeably.

The communication device in this application can be a terminal or a network device. The specific reference needs to be determined according to the description of the context. If the subject executing the method of this application is a terminal, it refers to the terminal. If the subject executing the method of this application is Network equipment refers to network equipment. If it is a terminal, the terminal can be a mobile terminal (such as a mobile phone). If it is a network equipment, the network equipment can be a base station, satellite, high altitude platform (HAPS, High Altitude Platform Station), or drone. (Unmanned Aerial Vehicle, UAV), etc.

Mobile terminals can be implemented in various forms. For example, the mobile terminal described in this application may include mobile phones, tablet computers, notebook computers, PDAs, personal digital assistants (Personal Digital Assistant, PDA), portable media players (Portable Media Player, PMP), navigation devices, Mobile terminals such as wearable devices, smart bracelets, and pedometers, as well as fixed terminals such as digital TVs and desktop computers.

In the following description, a mobile terminal will be taken as an example. Those skilled in the art will understand that, in addition to elements specifically used for mobile purposes, the structure according to the embodiments of the present application can also be applied to fixed-type terminals.

Please refer to Figure 1, which is a schematic diagram of the hardware structure of a mobile terminal that implements various embodiments of the present application. The mobile terminal 100 may include: an RF (Radio Frequency, radio frequency) unit 101, a WiFi module 102, an audio output unit 103, and a /V (audio/video) input unit 104, sensor 105, display unit 106, user input unit 107, interface unit 108, memory 109, processor 110, and power supply 111 and other components. Those skilled in the art can understand that the structure of the mobile terminal shown in Figure 1 does not constitute a limitation on the mobile terminal. The mobile terminal may include more or fewer components than shown in the figure, or some components may be combined, or different components may be used. layout.

The following is a detailed introduction to each component of the mobile terminal in conjunction with Figure 1:

The radio frequency unit 101 can be used to receive and send information or signals during a call. Specifically, after receiving the downlink information of the base station, it is processed by the processor 110; in addition, the uplink data is sent to the base station. Generally, the radio frequency unit 101 includes, but is not limited to, an antenna, at least one amplifier, transceiver, coupler, low noise amplifier, duplexer, etc. In addition, the radio frequency unit 101 can also communicate with the network and other devices through wireless communication. The above wireless communication can use any communication standard or protocol, including but not limited to GSM (Global System of Mobile communication, Global Mobile Communications System), GPRS (General Packet Radio Service, General Packet Radio Service), CDMA2000 (Code Division Multiple Access 2000 , Code Division Multiple Access 2000), WCDMA (Wideband Code Division Multiple Access, Wideband Code Division Multiple Access), TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, Time Division Synchronous Code Division Multiple Access), FDD-LTE (Frequency Division) Duplexing-Long Term Evolution, Frequency Division Duplex Long Term Evolution), TDD-LTE (Time Division Duplexing-Long Term Evolution, Time Division Duplex Long Term Evolution) and 5G, etc.

WiFi is a short-distance wireless transmission technology. The mobile terminal can help users send and receive emails, browse web pages, access streaming media, etc. through the WiFi module 102. It provides users with wireless broadband Internet access. Although FIG. 1 shows the WiFi module 102, it can be understood that it is not a necessary component of the mobile terminal and can be omitted as needed without changing the essence of the invention.

The audio output unit 103 may, when the mobile terminal 100 is in a call signal receiving mode, a call mode, a recording mode, a voice recognition mode, a broadcast receiving mode, etc., receive the audio signal received by the radio frequency unit 101 or the WiFi module 102 or store it in the memory 109 The audio data is converted into audio signals and output as sound. Furthermore, the audio output unit 103 may also provide audio output related to a specific function performed by the mobile terminal 100 (eg, call signal reception sound, message reception sound, etc.). The audio output unit 103 may include a speaker, a buzzer, or the like.

The A/V input unit 104 is used to receive audio or video signals. The A/V input unit 104 may include a graphics processor (Graphics Processing Unit, GPU) 1041 and a microphone 1042. The graphics processor 1041 can process still pictures or images obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. Video image data is processed. The processed image frames may be displayed on the display unit 106. The image frames processed by the graphics processor 1041 can be stored in the memory 109 (or other storage media) or sent via the radio frequency unit 101 or WiFi module 102. The microphone 1042 can receive sounds (audio data) via the microphone 1042 in operating modes such as a phone call mode, a recording mode, a voice recognition mode, and the like, and can process such sounds into audio data. The processed audio (voice) data can be converted into a format that can be sent to a mobile communication base station via the radio frequency unit 101 for output in a phone call mode. Microphone 1042 may implement various types of noise cancellation (or suppression) algorithms to eliminate (or suppress) noise or interference generated in the process of receiving and transmitting audio signals.

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. The proximity sensor can turn off the display when the mobile terminal 100 moves to the ear. Panel 1061 and/or backlight. As a kind of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in various directions (usually three axes). It can detect the magnitude and direction of gravity when stationary. It can be used to identify applications of mobile phone posture (such as horizontal and vertical screen switching, related games, magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tapping), etc.; as for the mobile phone, it can also be configured with fingerprint sensor, pressure sensor, iris sensor, molecular sensor, gyroscope, barometer, hygrometer, Other sensors such as thermometers and infrared sensors will not be described in detail here.

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.

The user input unit 107 may be used to receive input numeric 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 the user's touch operations on or near the touch panel 1071 (for example, the user uses a finger, stylus, or any suitable object or accessory on or near the touch panel 1071 operation), and drive the corresponding connection device according to the preset 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 orientation, detects the signal brought 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 contact point coordinates , and then sent to the processor 110, and can receive the commands sent by the processor 110 and execute them. In addition, 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 also include other input devices 1072. Optionally, other input devices 1072 may include but are not limited to one or more of physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, joysticks, etc., which are not specifically discussed here. limited.

Optionally, the touch panel 1071 can cover the display panel 1061. When the touch panel 1071 detects a touch operation on or near it, it is transmitted to the processor 110 to determine the type of the touch event, and then the processor 110 determines the type of the touch event according to the touch event. The type provides corresponding visual output on the display panel 1061. Although in Figure 1, the touch panel 1071 and the display panel 1061 are used as two independent components to implement the input and output functions of the mobile terminal, in some embodiments, the touch panel 1071 and the display panel 1061 can be integrated. The implementation of the input and output functions of the mobile terminal is not limited here.

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, external devices may include a wired or wireless headphone port, an external power (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device with an identification module, audio input/output (I/O) port, video I/O port, headphone port, etc. The interface unit 108 may be used to receive input (eg, 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 connect between the mobile terminal 100 and an external device. Transfer data between devices.

Memory 109 may be used to store software programs as well as various data. The memory 109 may mainly include a storage program area and a storage data area. Optionally, the storage program area may store an operating system, an application program required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the storage data area may Store data created based on the use of the mobile phone (such as audio data, phone book, etc.), etc. In addition, memory 109 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device.

The processor 110 is the control center of the mobile terminal, using various interfaces and lines to connect various parts of the entire mobile terminal, by running or executing software programs and/or modules stored in the memory 109, and calling data stored in the memory 109 , execute various functions of the mobile terminal and process data, thereby overall monitoring the mobile terminal. The processor 110 may include one or more processing units; preferably, the processor 110 may integrate an application processor and a modem processor. Optionally, the application processor mainly processes the operating system, user interface, application programs, etc., and modulation The demodulation processor mainly handles wireless communications. It can be understood that the above modem processor may not be integrated into the processor 110 .

The mobile terminal 100 may also include a power supply 111 (such as a battery) that supplies power to various components. Preferably, the power supply 111 may be logically connected to the processor 110 through a power management system, thereby achieving management of charging, discharging, and power consumption management through the power management system. and other functions.

Although not shown in FIG. 1 , the mobile terminal 100 may also include a Bluetooth module, etc., which will not be described again here.

In order 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.

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

Optionally, UE201 may be the above-mentioned mobile terminal 100, which will not be described again here.

E-UTRAN202 includes eNodeB2021 and other eNodeB2022, etc. Optionally, eNodeB2021 can be connected to other eNodeB2022 through backhaul (for example, X2 interface), eNodeB2021 is connected to EPC203, and eNodeB2021 can provide access from UE201 to EPC203.

EPC 203 may include MME (Mobility Management Entity, mobility management entity) 2031, HSS (Home Subscriber Server, home user server) 2032, other MME 2033, SGW (Serving Gate Way, service gateway) 2034, PGW (PDN Gate Way, packet data Network Gateway) 2035 and PCRF (Policy and Charging Rules Function, policy and charging functional entity) 2036, etc. Optionally, MME2031 is a control node that processes signaling between UE201 and EPC203, and provides bearer and connection management. HSS2032 is used to provide some registers to manage functions such as the home location register (not shown in the figure), and to save some user-specific information about service characteristics, data rates, etc. 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 business data flows and IP bearer resources. It is the policy and charging execution function. The unit (not shown) selects and provides available policy and charging control decisions.

IP services 204 may include the Internet, Intranet, IMS (IP Multimedia Subsystem, IP Multimedia Subsystem) or other IP services.

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 also can be applied to other wireless communication systems, such as GSM, CDMA2000, WCDMA, TD-SCDMA, 5G and New network systems (such as 6G) in the future are not limited here.

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

In some implementations, the mobile terminal accesses the corresponding cell based on its own location to implement communication with network equipment. For example, the cell may be a meta-cell for non-terrestrial communication scenarios and/or terrestrial communication scenarios. The meta-cell supports the decoupling of services and resources by default. When the mobile terminal moves from the source cell side to the target cell side, although the layer 1 (L1, Layer 2) link (carrier/channel) changes, the layer 2 The (L2, Layer 2) transport service can remain in continuous service (in one possible implementation, the Layer 3 (Layer 3) connection service can also remain in continuous service), and the protocol function anchors in L2 and/or L3 remain unchanged In this case, there is no need to reset the context information or re-establish the RRC connection. Thus, smooth business continuity can be guaranteed to the greatest extent.

Optionally, L2 can be the Service Data Adaptation Protocol (SDAP, Service Data Adaptation Protocol), Packet Data Convergence Protocol (PDCP, Packet Data Convergence Protocol), or Radio Link Control (RLC) in the wireless communication protocol architecture. ), Media Access Control (MAC, Media Access Control).

Optionally, L3 can be Radio Resource Control (RRC, Radio Resource Control).

When the location of the mobile terminal changes, the cell to which the mobile terminal is connected may change, that is, cell switching. Optionally, the mobile terminal implements the cell switching process by executing a handover (HO) command. In some implementations, the mobile terminal can also execute a switching command when preset switching conditions are met, that is, conditional handover (CHO).

Figure 3A is a signaling diagram of cell handover based on HO technology, including:

Step1: Measurement Control and Reports;

Step2: Handover Decision;

Step3: Handover request (HANDOVER REQUEST);

Step4: Admission Control;

Step5: Handover request response (HANDOVER REQUEST ACKNOWLEDGE);

Step6: Radio access network handover initialization (RAN Handover Initiation);

Step7a: Early status migration (EARLY STATUS TRANSFER);

Step7: Data sequence status migration (SN STATUS TRANSFER);

Step8: Radio access network handover is completed (RAN Handover Completion);

Step8a: Handover successful (HANDOVER SUCCESS);

Step8b: Data sequence status migration (SN STATUS TRANSFER).

Exemplarily, the above process exemplarily shows the main steps to implement HO cell handover. Through the above steps, the handover of the mobile terminal from the source cell (Source gNB) to the target cell (Target gNB) can be realized. The details of each step are as follows: The implementation method will not be described again here.

Figure 3B is a signaling diagram of cell handover based on CHO technology, including:

Step1: Measurement Control and Reports;

Step2: Handover Decision;

Step3: Handover request (HANDOVER REQUEST);

Step4: Admission Control;

Step5: Handover request response (HANDOVER REQUEST ACKNOWLEDGE);

Step6: Radio Resource Control Reconfiguration (RRCReconfiguration);

Step7: Radio Resource Control Reconfiguration Complete (RRCReconfiguration Complete);

Step7a: Early status migration (EARLY STATUS TRANSFER);

Step8: Condition switching is completed (CHO Handover Completion);

Step8a: Handover successful (HANDOVER SUCCESS);

Step8b: Data sequence status migration (SN STATUS TRANSFER).

Optionally, in the steps of radio access network handover initialization (Step 6 in Figure 3A) and radio resource control reconfiguration (Step 6 in Figure 3B), the mobile terminal will receive the source cell-related handover configuration, which configuration includes the target cell access. Enter the parameters, and the terminal completes its own configuration according to the handover configuration, thereby achieving the purpose of handover from the source cell to the target cell. During the handover initialization process, the terminal needs to obtain the timing advance (Timing Advance, TA) of the target cell, and then adjust itself based on the timing advance to realize the handover process to the target cell.

For example, the way for the terminal to obtain the timing advance is usually by performing random access with the target cell. After successfully accessing the cell, the timing advance is generally configured through the media access control layer control unit.

Figure 4 is an exemplary signaling diagram for performing a random access process. Refer to Figure 4. The figure shows a contention-based (Contention Based Random Access, CBRA) four-step (4-step) random access. The access process includes:

Step1: MSG1, Random Access Preamble;

Step2: MSG2, random access response (Random Access Response);

Step3: MSG3, scheduled transmission (Scheduled Transmission);

Step4: MSG4, Contention Resolution.

Figure 5 is another exemplary signaling diagram for performing a random access process. Refer to Figure 3C. The figure shows a two-step (2-step) based on contention (Contention Free Random Access, CBRA). The random access process includes:

Step1a: MSGA, Random Access Preamble;

Step1b: MSGA, randomly sends the physical uplink shared channel payload (PUSCH payload);

Step2: MSGB, Contention Resolution.

However, the process of obtaining the time advance of the target cell by sending a random access request to the target cell requires multiple interactions between the terminal and the target cell, which will increase a large amount of signaling overhead and thus increase the load on the network equipment. , affecting the real-time nature and service continuity of network communications. At the same time, the terminal must successfully complete contention resolution (Contention Resolution) during the random access process to obtain access resources, complete the wireless resource control connection, and then further complete the interaction with the core network .

In order to solve the above technical problems, in the solution provided by this application, the terminal receives the configuration signaling sent by the source cell and determines the timing advance of the target cell based on the configuration signaling. Then, based on the timing advance of the target cell, it directly The random access (RACH-less) method completes the wireless access network handover initialization process and realizes cell handover, avoiding the signaling overhead caused by the random access process, reducing the load of network equipment, and accelerating the establishment of a connection with the target cell. Reduce the delay caused by handover and improve the quality of network communication.

Figure 6 is a signaling interaction diagram of the cell switching method shown in the first exemplary embodiment of the present application.

The cell switching method provided by this application is executed by a terminal, which can be connected to a network device. The terminal can be, for example, a mobile phone, a tablet computer, a wearable device, and other devices capable of communication.

As shown in Figure 6, the cell switching method provided by this application includes the following steps:

S011, the terminal receives configuration signaling.

S012: The terminal determines the time advance of the target cell based on the configuration signaling.

Exemplarily, the above steps are the steps for the terminal to obtain the time advance of the target cell. Optionally, the configuration signaling is sent by the source cell where the terminal is currently located, and the configuration signaling includes information used to determine the time advance of the target cell. The terminal can determine the timing advance of the target cell based on the configuration signaling sent by the source cell without sending a random access request to the target cell, thereby completing the radio access network handover process without random access.

Optionally, the configuration signaling is Radio Resource Control Reconfiguration (RRCReconfiguration) signaling or Media Access Control Layer Control Element (MAC Control Element, MAC CE) signaling.

Optionally, the radio resource control reconfiguration signaling also includes physical layer parameters of the target cell. Optionally, the physical layer parameters include at least one of the following: physical uplink control channel (PUCCH), physical uplink shared channel (Physical uplink shared channel, PUSCH); Physical downlink control channel (PDCCH), Physical downlink shared channel (Physical downlink shared channel, PDSCH), Partial Bandwidth Part (BWP), Synchronization Signaling Block (SS) /PBCH block, SSB) resources, channel state information reference signal (Channel State Information-Reference Signal, CSI-RS) resources, random access resources, frequency information, target cell identification code (cell id).

Optionally, the target cell may be a terrestrial cell (Terrestrial Network, TN) or a non-terrestrial cell (Non-Terrestrial Network, NTN). When the target cell is a terrestrial cell, the network equipment corresponding to the target cell may be a base station, gNB, eNB, or BS. Correspondingly, when the target cell is a non-terrestrial cell, the network equipment corresponding to the target cell can be a satellite (Staellite), a high-altitude platform, or a drone.

Optionally, the time advance of the target cell is confirmed based on at least one of terminal location information, neighboring cell ephemeris (Ephemeris) parameters, and source cell ephemeris parameters.

In a possible implementation, the configuration signaling includes the time advance of the target cell, that is, after the terminal connects to the target cell, the time of sending the signal needs to be advanced. The time advance is the source cell based on the location information of the terminal and the target. The cell ephemeris parameters of the cell are calculated and sent to the terminal through configuration signaling. The terminal can directly adjust the advance of the sending signal time based on the received configuration signaling, that is, the time advance of the target cell.

Optionally, the source cell calculates the time advance between the terminal and the target cell based on the location information reported by the terminal and the ephemeris parameter of the target cell.

Optionally, the source cell calculates the timing advance between the terminal and the source cell based on the location information reported by the terminal and the ephemeris parameter of the source cell, and determines the sending timing advance based on the difference in the timing advance between the source cell and the target cell.

Optionally, the terminal restores the timing advance between the terminal and the target cell after performing compensation based on the obtained timing advance difference. The terminal restores the time advance between the terminal and the target cell based on the existing time advance between the source cell and the obtained time advance.

Optionally, the location information of the terminal is carried in a measurement report (Measurement Report, MR) or provided through terminal assistance information (UEAssistanceInformation, UAI) signaling.

Optionally, the network device can require the terminal to report auxiliary information through the terminal auxiliary information through radio resource control reconfiguration signaling. The above requirements include at least one of the following: expected to increase/decrease the connection state discontinuous reception (Discontinuous Reception, DRX) length, overheating Overheating assistance information, discontinuous reception parameters for power saving preference, maximum aggregate bandwidth for power saving preference, Secondary Component Sarrier for power saving preference, SCC) number, the maximum number of multiple-input and multiple-output (MIMO) layers for power consumption and energy saving preference, the minimum scheduling offset of fast carrier scheduling for power consumption and energy saving preference, and the preferred RRC status , Grant auxiliary information, reference information, and terminal location information used for test link (Sidelink) communication configuration.

In another possible implementation, the configuration signaling includes parameters for determining the time advance of the target cell, optionally including at least one of adjacent cell ephemeris parameters and source cell ephemeris parameters. After receiving the configuration signaling, the terminal determines the time advance of the target cell based on the neighboring cell ephemeris parameters and the source cell ephemeris parameters included in the configuration signaling.

Optionally, the terminal calculates the time advance between the terminal and the target cell through its own position information and the target cell ephemeris parameters.

Optionally, the terminal calculates the difference in timing advance by using the obtained difference in ephemeris parameters between the source cell and the target cell, and determines the terminal by adding the existing timing advance between the terminal and the source cell to the obtained difference in timing advance. The time advance with the target cell.

Optionally, the ephemeris parameter includes at least one of the following: the spatial position of the cell corresponding to the earth, the speed of the cell corresponding to the earth, and the orbital parameters of the cell earth. Optionally, non-terrestrial network equipment can be satellites, high-altitude platforms, drones, etc. The spatial location of the non-terrestrial network cell, optionally, is the actual location of the satellite, for example. The location information of the terminal includes the terminal's Global Navigation Satellite System (GNSS) position or Earth-Centered, Earth-Fixed, ECEF (Earth-Centered, Earth-Fixed, ECEF) position.

S013: The terminal establishes non-random access with the target cell based on the time advance of the target cell.

For example, after determining the timing advance of the target cell, the terminal adjusts based on the timing advance of the target cell and completes the initialization process, that is, it can switch to the target cell in a random access (RACH-less) manner. Optionally, the radio resource control reconfiguration signaling also includes the physical layer parameters of the target cell. Based on the time advance of the target cell, the specific implementation steps of switching to the target cell in a non-random access mode include:

S0131: Synchronize with the target cell based on the physical layer parameters corresponding to the target cell.

S0132: After successful synchronization, send uplink control information to the target cell based on the time advance of the target cell, and/or receive downlink control information sent by the target cell.

Optionally, the downlink control information is Downlink Control Information (DCI), and the uplink control information is Uplink Control Information (UCI). After the terminal obtains the time advance of the target cell, it determines the time advance according to the configured time advance and the physical layer of the target cell. Parameters perform RACH-less HO. Optionally, the terminal starts receiving DCI and sending UCI after synchronizing to the target cell to implement the process of handover to the target cell. Optionally, the terminal uses the physical layer configuration parameters of the target cell during the synchronization process, including: using the target cell before the synchronization process. The physical layer configuration parameters of the cell are performed during synchronization of the target cell or the terminal uses the physical layer configuration parameters of the target cell after synchronization with the target cell.

Figure 7 is a signaling interaction diagram of the cell switching method shown in the second exemplary embodiment of the present application. As shown in Figure 7, it includes the following steps:

S021. The terminal receives the radio resource control reconfiguration signaling sent by the source cell, and the signaling includes the time advance of the target cell.

S022: The terminal obtains the time advance of the target cell according to the radio resource control reconfiguration signaling sent by the source cell.

Exemplarily, the above step is a step for the terminal to obtain the timing advance of the target cell. Optionally, the timing advance of the target cell may be determined by the source cell based on the location information reported by the terminal and the ephemeris parameter of the target cell, and Sent to the terminal through radio resource control reconfiguration signaling. In this embodiment, the terminal obtains and configures the time advance of the target cell by directly receiving the configuration signaling (radio resource control reconfiguration signaling) sent by the network device corresponding to the source cell, so that the terminal can advance the time based on the target cell. The traffic is switched to the target cell without random access.

S023: The terminal sends radio resource control reconfiguration completion signaling to the source cell.

S024: The terminal switches to the target cell in a non-random access manner based on the time advance of the target cell.

For example, radio resource control reconfiguration signaling is a message sent by the source cell to the terminal to implement cell handover. The terminal can obtain the connection parameters of the target cell based on the information in the radio resource control reconfiguration signaling (but not Including information related to the amount of advance time of the target cell), it is necessary to continue to initiate random access requests in order to complete the reconfiguration process before cell handover. In this embodiment, by adding the advance time of the target cell in the radio resource control reconfiguration signaling, the terminal can directly obtain the advance time of the target cell from the radio resource control reconfiguration signaling, thereby eliminating the need for random access. process. After the terminal configuration is completed, the radio resource control reconfiguration complete (RRCReconfigurationComplete) signaling is sent to the source cell to complete the reconfiguration process of the terminal by the source cell. After that, the terminal continues to perform steps such as synchronizing with the network equipment corresponding to the target cell, and then implements handover from the source cell to the target cell. Optionally, the terminal sends radio resource control reconfiguration signaling to complete cell switching after synchronizing with the target cell. Optionally, when the terminal fails to perform handover to the target cell without random access using the time advance amount, it switches to the target cell in a random access manner.

Figure 8 is a signaling interaction diagram of the cell switching method shown in the third exemplary embodiment of the present application. As shown in Figure 8, it includes the following steps:

S031. The terminal receives the radio resource control reconfiguration signaling sent by the source cell, which contains the ephemeris parameters of the neighboring cells.

S032: The terminal determines the time advance of the target cell based on the ephemeris parameters of the neighboring cells included in the signaling.

Exemplarily, in this embodiment, S031-S032 are the steps for the terminal to determine the target cell time advance. Optionally, the terminal receives the radio resource control reconfiguration signaling sent by the source cell, and uses the radio resource control reconfiguration signaling to The ephemeris parameters of the included cells determine the time advance of the target cell. Optionally, the target cell is a neighboring cell of the source cell, that is, a neighbor cell. Figure 9 is a schematic diagram of a neighboring cell exemplarily shown in this application. As shown in Figure 9, the neighboring cell refers to the neighboring cell of the source cell where the terminal is currently located. The source cell interacts with the neighboring cell so that the source cell Obtain the ephemeris parameters of neighboring cells or the source cell obtains the ephemeris parameters of neighboring cells through the ground station (Gateway). Optionally, the target cell is generated from a neighboring cell.

Optionally, the radio resource control reconfiguration signaling includes ephemeris parameters of at least one neighboring cell, and the terminal confirms the target cell to perform conditional handover based on the ephemeris parameters and/or conditional measurement parameters of the neighboring cells.

Optionally, the condition measurement parameters include at least one of the following: signal strength (Reference Signal Received Power, RSRP), signal quality (Reference Signal Received Quality, RSRQ), and signal-to-interference&Noise Ratio (SINR).

Optionally, conditional measurement parameters are used for conditional switching.

Optionally, the radio resource control reconfiguration signaling includes the ephemeris parameter of at least one neighboring cell. In a first exemplary implementation, the terminal determines the target cell to perform conditional handover based on its own location information and the ephemeris parameters of at least one neighboring cell. Optionally, specific implementation methods of the above steps include:

The terminal calculates the distance between the terminal and neighboring cells based on its own location information and the ephemeris parameters of each neighboring cell. The terminal sorts the calculated distances and selects the neighboring cell with the shortest distance as the target cell for conditional handover.

Optionally, in the second exemplary implementation, the terminal confirms the target cell to perform conditional handover based on the condition measurement parameters (signal strength, signal quality, signal-to-noise ratio) obtained by measuring at least one neighboring cell.

Optionally, the terminal confirms the implementation method of the target cell to perform conditional handover based on the conditional measurement parameters obtained by measuring at least one neighboring cell, including:

Optionally, measure the signal strength of each neighboring cell, and use the neighboring cell with the highest signal strength as the target cell;

Optionally, measure the signal quality of each neighboring cell, and use the neighboring cell with the best signal quality as the target cell;

Optionally, measure the signal-to-noise ratio of each neighboring cell, and use the neighboring cell with the highest signal-to-noise ratio as the target cell;

Optionally, the results of at least two of the signal strength, signal quality, and signal-to-noise ratio of each neighboring cell are measured, and the neighboring cell with the best result is selected as the target cell.

Optionally, in the third exemplary implementation, the terminal jointly determines the conditional handover to be performed based on its own location information and ephemeris parameters of at least one neighboring cell, as well as conditional measurement parameters obtained by measuring at least one neighboring cell. target neighborhood.

Optionally, the terminal jointly determines the implementation method of the target cell to perform conditional handover based on its own location information and the ephemeris parameters of at least one neighboring cell, as well as the conditional measurement parameters obtained by measuring at least one neighboring cell, including:

Optionally, the terminal calculates the distance between the terminal and each neighboring cell based on its own location information and the ephemeris parameter of at least one neighboring cell; then, the terminal filters neighboring cells that meet the distance condition, and then selects the neighboring cells that meet the screening distance condition. In the cell, the signal strength of each neighboring cell is measured, and the neighboring cell with the highest signal strength is used as the target cell.

Optionally, the terminal calculates the distance between the terminal and each neighboring cell based on its own location information and the ephemeris parameter of at least one neighboring cell; then, the terminal filters neighboring cells that meet the distance condition, and then selects the neighboring cells that meet the screening distance condition. In the cell, the signal quality of each neighboring cell is measured, and the neighboring cell with the best signal quality is used as the target cell.

Optionally, the terminal calculates the distance between the terminal and each neighboring cell based on its own location information and the ephemeris parameter of at least one neighboring cell; then, the terminal filters neighboring cells that meet the distance condition, and then selects the neighboring cells that meet the screening distance condition. In the cell, the signal-to-noise ratio of each neighboring cell is measured, and the neighboring cell with the highest signal-to-noise ratio is used as the target cell.

Optionally, the terminal calculates the distance between the terminal and each neighboring cell based on its own location information and the ephemeris parameter of at least one neighboring cell; then, the terminal filters neighboring cells that meet the distance condition, and then selects the neighboring cells that meet the screening distance condition. In the cell, the results of at least two of the signal strength, signal quality, and signal-to-noise ratio of each neighboring cell are measured, and the neighboring cell with the best result is selected as the target cell.

Optionally, the terminal measures the signal strength of each neighboring cell and selects neighboring cells that meet the signal strength condition (signal strength is greater than the signal strength threshold). After that, the terminal determines the location information based on its own location information and the ephemeris of the neighboring cells that meet the signal strength condition. Parameters, calculate the distance between the terminal and each neighboring cell that meets the signal strength condition, and use the neighboring cell with the shortest distance as the target cell.

Optionally, the terminal measures the signal quality of each neighboring cell and selects neighboring cells that meet the signal quality conditions (signal quality is greater than the signal quality threshold). After that, the terminal determines the location information based on its own location information and the ephemeris of the neighboring cells that meet the signal quality conditions. Parameters, calculate the distance between the terminal and each neighboring cell that meets the signal quality conditions, and use the neighboring cell with the shortest distance as the target cell.

Optionally, the terminal measures the signal-to-noise ratio of each neighboring cell and selects neighboring cells that meet the signal-to-noise ratio condition (the signal-to-noise ratio is greater than the signal-to-noise ratio threshold). After that, the terminal determines the location information based on its own location information and the above-mentioned cells that meet the signal-to-noise ratio condition. The ephemeris parameters of neighboring cells are used to calculate the distance between the terminal and the neighboring cells under each signal-to-noise ratio condition, and the neighboring cell with the shortest distance is used as the target cell.

Optionally, the terminal measures the results of at least two of the signal strength, signal quality, and signal-to-noise ratio of each neighboring cell, and selects neighboring cells whose results meet the signal conditions (threshold). After that, the terminal determines the results based on its own location information and the above conditions. The ephemeris parameters of the neighboring cells according to the signal conditions are used to calculate the distance between the terminal and each neighboring cell that meets the conditions, and the neighboring cell with the shortest distance is used as the target cell.

Optionally, the ephemeris parameter includes at least one of the following: the spatial position of the cell corresponding to the earth, the speed of the cell corresponding to the earth, and the orbital parameter of the cell corresponding to the earth. Optionally, non-terrestrial network equipment can be satellites, high-altitude platforms, drones, etc. The spatial location of the non-terrestrial network equipment corresponding to the cell, optionally, for example, the actual location of satellites, high-altitude platforms, and drones.

Optionally, the location information of the terminal includes the terminal's Global Navigation Satellite System (GNSS) location or Earth-Centered, Earth-Fixed, ECEF (Earth-Centered, Earth-Fixed, ECEF) position.

S033: The terminal sends radio resource control reconfiguration completion signaling to the source cell.

S034: The terminal switches to the target cell in a non-random access manner based on the time advance of the target cell.

In this embodiment, by carrying the ephemeris parameters of neighboring cells in the radio resource control reconfiguration signaling, the terminal can directly or indirectly obtain the ephemeris parameters of the target cell from the radio resource control reconfiguration signaling, and then based on its own location The information and the ephemeris parameters of the target cell determine the time advance of the target cell. This eliminates the need for random access. After the terminal configuration is completed, radio resource control reconfiguration completion signaling is sent to the target cell to complete the reconfiguration process of the terminal by the network equipment corresponding to the source cell. The specific implementation process is similar to step S024 in the embodiment shown in FIG. 7 and will not be described again here.

In this embodiment, the terminal obtains the time advance of the target cell through the matching relationship between the ephemeris parameter and the location information, so that the terminal can switch to the target cell without random access based on the time advance of the target cell.

Figure 10 is a signaling interaction diagram of the cell switching method shown in the fourth exemplary embodiment of the present application.

The cell switching method provided by this application is executed by a terminal, which can be connected to a network device. The terminal can be a mobile phone, tablet computer, wearable device, or other device capable of communication.

As shown in Figure 10, the cell switching method provided in this embodiment application includes the following steps:

S041, the terminal receives configuration signaling.

S042: The terminal obtains the time advance effective period of the target cell according to the configuration signaling.

For example, the time advance valid period refers to the valid time interval corresponding to the cell time advance. If the current time (such as system time) is within the time advance valid period, the time advance is valid; if the current time is within the time advance valid period, the time advance is valid. When the time advance is outside the effective time period, the time advance is invalid, and the terminal only switches to the target cell in a non-random access manner within the time advance effective time.

Exemplarily, the time advance valid period of the target cell is provided by the source cell, or is provided by the target cell to the source cell, and optionally forwarded to the terminal through the source cell.

Optionally, the time advance effective time is configured through radio resource control reconfiguration signaling or media access control layer control unit signaling.

Optionally, the target cell may be a terrestrial cell or a non-terrestrial cell. When the target cell is a terrestrial cell, the network equipment corresponding to the target cell may be a base station, gNB, eNB, or BS. Correspondingly, when the target cell is a non-terrestrial cell, the network equipment corresponding to the target cell can be a satellite, a high-altitude platform, or a drone.

Optionally, when the configuration signaling includes first switching information for instructing the terminal to perform cell switching in time-based CHO (Timer-based CHO), the configuration signaling also includes the first moment and/or the second moment. ; When the configuration signaling includes second handover information used to instruct the terminal to perform cell switching with location-based CHO (Location-based CHO), or instructs the terminal to perform cell switching with HO, the configuration signaling also includes a valid interval . For example, the first moment represents the starting moment of the valid period of the timing advance of the target cell; the second moment represents the end moment of the valid period of the timing advance of the target cell.

Optionally, the first time is provided in the form of a specific system time, and the second time is provided in the form of a difference. Specifically, the specific system time at the second time is obtained by adding the difference between the first time and the second time.

Figure 11 is a schematic diagram of configuration signaling provided by an embodiment of the present application. For example, the configuration signaling can be radio resource control reconfiguration signaling sent by the source cell to the terminal. After the terminal receives and parses the configuration signaling, if configured The signaling includes the first handover information (shown as mode-1 in the figure), that is, instructing the terminal to perform cell switching in the Timer-based CHO mode. The configuration signaling also includes the first time (shown as T1 in the figure) and the second time. (shown as T2 in the figure), the time advance effective period is indicated by the first moment and/or the second moment. If the configuration signaling includes the second handover information (shown as mode-2 in the figure), and the second handover information is conditional handover, that is, the source cell instructs the terminal to perform cell handover in the Location-based CHO mode, a new timer indication is introduced The time advance valid period of the target cell, or the validity duration for UL sync information information is used to indicate the time advance valid period of the target cell; if the second handover information is a general handover (that is, the source cell instructs the terminal in HO mode to perform cell handover), a new timer is introduced to indicate the time advance valid period of the target cell, or validity duration for UL sync information is used to indicate the time advance valid period of the target cell.

Optionally, the validity duration for UL sync information is the validity time indicated in the target cell system message.

Optionally, the target cell system information may be non-terrestrial network specific system information (NTN specific system information), such as but not limited to: system message 19 (SIB19).

In one possible implementation, the specific implementation of obtaining the time advance effective period of the target cell according to the configuration signaling includes the following steps:

S0421, receive configuration signaling;

S0422, the configuration signaling includes switching information;

S0423, if the switching information is the first switching information, the configuration information also includes the first time and/or the second time, and the first time and/or the second time are the time advance valid period; and/ or,

S0424, if the switching information is the second switching information, obtain the time advance valid period according to the validity duration for UL sync information or the timer information.

S043: The terminal switches to the target cell in a non-random access manner according to the time advance effective period of the target cell.

Optionally, the specific implementation method of switching to the target cell in a non-random access manner according to the time advance effective period of the target cell includes:

S0431: Get the current system time.

S0432: If the current system time is within the time advance valid period of the target cell, switch to the target cell in a non-random access manner based on the time advance;

S0432: If the current system time is outside the time advance valid period of the target cell, switch to the target cell in random access mode.

Optionally, the configuration signaling also includes the time advance of the target cell, and the configuration signaling received by the terminal includes the time advance of the target cell and the corresponding time advance valid period.

Figure 12 is a signaling interaction diagram of the cell switching method shown in the fifth exemplary embodiment of the present application. As shown in Figure 12, it includes the following steps:

S051. The terminal receives configuration signaling sent by the source cell. The configuration signaling includes the ephemeris parameter of at least one neighboring cell and the corresponding time advance valid period.

S052: The terminal determines the time advance of the target cell based on the ephemeris parameters of the neighboring cells and the location information of the terminal.

S053: The terminal determines whether the time advance of the target cell is in a valid state based on the current system time and the time advance valid period.

S054, if it is in the valid state, switch to the target cell in a non-random access manner based on the time advance of the target cell. and / or,

S055, if it is in an invalid state, switch to the target cell in random access mode.

In this embodiment, the configuration signaling sent by the source cell to the terminal also contains the ephemeris parameters of at least one neighboring cell and the time advance effective time corresponding to each neighboring cell. After receiving the configuration signaling, the terminal first determines which The target cell, optionally, the terminal determines the target cell among the plurality of cells based on the preset judgment rules, and then obtains the ephemeris parameters of the target cell.

Optionally, the configuration signaling includes ephemeris parameters of at least one neighboring cell, and the terminal confirms the target cell to perform conditional handover based on the ephemeris parameters and/or conditional measurement parameters of the neighboring cells. Optionally, the condition measurement parameters include at least one of the following: signal strength (Reference Signal Received Power, RSRP), signal quality (Reference Signal Received Quality, RSRQ), and signal-to-interference&Noise Ratio (SINR).

Optionally, the configuration signaling includes ephemeris parameters of at least one neighboring cell. In a first exemplary implementation, the terminal determines the target cell to perform conditional handover based on its own location information and the ephemeris parameters of at least one neighboring cell. Optionally, specific implementation methods of the above steps include:

Optionally, the terminal measures the results of at least two of the signal strength, signal quality, and signal-to-noise ratio of each neighboring cell, and selects neighboring cells whose results meet the conditions (thresholds). After that, the terminal determines the results based on its own location information and the above conditions. The ephemeris parameters of neighboring cells are used to calculate the distance between the terminal and each neighboring cell that meets the conditions, and the neighboring cell with the shortest distance is used as the target cell.

Optionally, after determining the target cell, the terminal determines whether the time advance of the target cell is in a valid state based on the current system time and the time advance valid period. If it is in a valid state, the terminal makes adjustments based on the time advance of the target cell. And it switches to the target cell in a non-random access manner. The specific implementation method is the same as that in the above embodiment and will not be described again. If it is in an invalid state, it means that the time advance of the cell has expired and no cell switching is performed.

By carrying the time advance valid period in the configuration signaling, time advance deviation caused by expiration is avoided, and the real-time performance and accuracy of the cell handover process of the terminal are improved. At the same time, network equipment can more effectively reserve non-random access resources and improve the effective utilization of resources.

Optionally, the configuration signaling is radio resource control reconfiguration signaling or media access control layer control unit signaling.

Optionally, RRCReconfiguration also includes physical layer parameters of the target cell. Optionally, the physical layer parameters include at least one of the following: physical uplink control channel, physical uplink shared channel; physical downlink control channel, physical downlink shared channel, partial bandwidth , synchronization signaling block resources, channel state information reference signal resources, random access resources, frequency information, and target cell identification codes.

Optionally, the target cell may be a small terrestrial cell or a non-terrestrial cell. When the target cell is a terrestrial cell, the network equipment corresponding to the target cell may be a base station, gNB, eNB, or BS. Correspondingly, when the target cell is a non-terrestrial cell, the network equipment corresponding to the target cell can be a satellite, a high-altitude platform, or a drone.

Optionally, the terminal restores the time advance between the terminal and the target cell after performing compensation based on the obtained time advance difference. The terminal restores the time advance between the terminal and the target cell based on the existing time advance between the source cell and the obtained time advance.

Optionally, the location information of the terminal is carried in the measurement report or provided through terminal auxiliary information signaling.

Optionally, the network device may require the terminal to report auxiliary information through the terminal auxiliary information through radio resource control reconfiguration signaling. The requirements include at least one of the following: a desire to increase/decrease the connection state discontinuous reception length, overheating auxiliary information, for function Discontinuous reception parameters for power consumption and energy saving preference, maximum aggregate bandwidth for power consumption and energy saving preference, number of second carriers for power consumption and energy saving preference, maximum number of multiple input and multiple output layers for power consumption and energy saving preference, and Fast carrier scheduling minimum scheduling offset, preferred RRC status, grant auxiliary information for test link communication configuration, provision of reference information, and terminal location information. Optionally, the ephemeris parameter includes at least one of the following: the spatial position of the cell corresponding to the earth, the speed of the cell corresponding to the earth, and the orbital parameter of the cell corresponding to the earth. Optionally, non-terrestrial network equipment can be satellites, high-altitude platforms, drones, etc. The cell corresponds to the spatial position of the earth, optionally, for example, the actual position of the satellite. The location information of the terminal includes the terminal's Global Navigation Satellite System (GNSS) position or Earth-Centered, Earth-Fixed, ECEF (Earth-Centered, Earth-Fixed, ECEF) position.

Figure 13 is a signaling interaction diagram of the cell switching method shown in the sixth exemplary embodiment of the present application.

As shown in Figure 13, the cell switching method provided by this application includes the following steps:

S061: The terminal switches to the target cell in a non-random access manner based on preset parameters.

Exemplarily, the preset parameters are parameters used to support the terminal device to switch to the target cell in a non-random access mode. Optionally, the preset parameters may be parameters that are required when the terminal device switches to the target cell in a non-random access mode. The parameters used, such as time advance, physical layer parameters of the target cell, etc.; can also be indirect information used to determine and generate the parameters that need to be used when the above-mentioned terminal equipment switches to the target cell in a non-random access manner, such as location information , ephemeris parameters, etc. Therefore, the terminal device can switch to the target cell in a non-random access manner based on preset parameters, thereby avoiding the problem of increased signaling overhead caused by the random access process and reducing communication delays. Optionally, the preset parameters may be sent by other terminal devices or network devices to the terminal device executing step S061, or may be generated at the terminal device based on user instructions or trigger instructions.

Optionally, the preset parameters include at least one of location information, neighboring cell ephemeris parameters, and source cell ephemeris parameters.

Optionally, the target cell is a non-terrestrial cell or a terrestrial cell.

Optionally, the specific implementation steps of S061 include:

Step S0611: Confirm the time advance based on preset parameters.

In a possible implementation, the preset parameters include a time advance.

In another possible implementation, the preset parameters include at least one of terminal location information, neighbor cell ephemeris parameters, and source cell ephemeris parameters. Based on at least one of the above information in the preset parameters, Determine the time advance. For the specific implementation process, please refer to the corresponding steps of determining the time advance in the embodiment shown in Figures 6 to 8, which will not be described again here.

Step S0612: Based on the time advance, switch to the target cell in a non-random access manner.

Optionally, the specific implementation method of switching to the target cell in a non-random access manner includes: synchronizing with the target cell based on the physical layer parameters corresponding to the target cell; after the synchronization is successful, based on the physical layer parameters of the target cell Time advance, send uplink control information to the target cell, and/or receive downlink control information sent by the target cell; send radio resource control reconfiguration completion signaling to the target cell to complete the cell handover process.

For the specific implementation process, please refer to the corresponding steps of the terminal switching to the target cell in a non-random access manner in the embodiments shown in Figures 6 to 8, which will not be described again here.

Figure 14 is a signaling interaction diagram of the cell switching method shown in the seventh exemplary embodiment of the present application.

The cell switching method provided by this application is based on the embodiment shown in Figure 13, and adds the step of obtaining preset parameters.

As shown in Figure 14, the cell switching method provided by this application includes the following steps:

S071: The terminal receives the configuration signaling sent by the source cell.

S072: The terminal obtains preset parameters according to the configuration signaling.

S073: The terminal switches to the target cell in a non-random access manner based on preset parameters.

Optionally, the configuration signaling includes the time advance of the target cell.

Optionally, the configuration signaling includes neighboring cell ephemeris parameters and/or source cell ephemeris parameters.

Optionally, the preset parameters include the neighboring cell ephemeris parameters and/or the source cell ephemeris parameters, and the neighboring cell ephemeris parameters and/or the source cell ephemeris parameters are determined by configuration signaling.

Optionally, the radio resource control reconfiguration signaling also includes physical layer parameters of the target cell. Optionally, the physical layer parameters include at least one of the following: physical uplink control channel, physical uplink shared channel; physical downlink control channel, physical downlink Shared channel, partial bandwidth, synchronization signaling block resources, channel state information reference signal resources, random access resources, frequency information, and target cell identification code.

Optionally, the target cell may be a terrestrial cell or a non-terrestrial cell. When the target cell is a terrestrial cell, the network equipment corresponding to the target cell may be a base station, gNB, eNB, or BS. Correspondingly, when the target cell is a non-terrestrial cell, the network equipment corresponding to the target cell can be a satellite, a high-altitude platform, or a drone. Optionally, the terminal restores the timing advance between the terminal and the target cell after performing compensation based on the obtained timing advance difference. The terminal restores the time advance between the terminal and the target cell based on the existing time advance between the source cell and the obtained time advance.

Optionally, the network device can require the terminal to report auxiliary information through the terminal auxiliary information through radio resource control reconfiguration signaling. The above requirements include at least one of the following: Desiring to increase/reduce the connection state discontinuous reception length, overheating auxiliary information, and power consumption. Discontinuous reception parameters for energy-saving preference, maximum aggregate bandwidth for power-saving preference, number of second carriers for power-saving preference, maximum number of multiple-input multiple-output layers for power-saving preference, fast speed for power-saving preference Carrier scheduling minimum scheduling offset, preferred RRC status, grant auxiliary information for test link communication configuration, provision reference information, and terminal location information.

Optionally, when the preset parameters include the time advance, or include the neighbor cell ephemeris parameters and/or the source cell ephemeris parameters, the specific implementation of step S073 is the same as step S061 in the embodiment shown in Figure 13 The implementation method is the same, please refer to the relevant introduction in Figure 13.

Optionally, the preset parameters also include a valid period of time advance.

Optionally, when the preset parameters include first switching information for instructing the terminal to perform cell switching in a time-based conditional switching, the configuration signaling further includes the first moment and/or the second moment.

Optionally, when the preset parameters include second handover information for instructing the terminal to perform cell switching with location-based condition switching, or instructing the terminal to perform cell switching with handover, the preset parameters also include a valid interval.

Optionally, the valid period of the timing advance can be determined through configuration signaling.

Optionally, the configuration signaling includes a valid period of the time advance, and/or the first moment and/or the second moment, and/or the valid interval.

Optionally, a possible implementation of step S073 includes: switching to the target cell in a non-random access manner according to the valid period of the time advance.

The specific implementation process can be seen in the embodiments shown in Figures 10 to 12 for obtaining the effective period of the time advance and the corresponding steps of switching to the target cell in a non-random access manner according to the effective period of the time advance, which will not be discussed here. Repeat.

Figure 15 is a signaling interaction diagram of the cell switching method shown in the sixth exemplary embodiment of the present application.

The cell switching method provided by this application is executed by the network equipment corresponding to the source cell. The network equipment can be connected to the terminal. The network equipment can be a terrestrial network equipment, such as a base station, gNB, eNB, BS, or a non-terrestrial network equipment, such as Satellites, high-altitude platforms, drones, etc.

As shown in Figure 15, the cell switching method provided by this embodiment application includes the following steps:

S081: The source cell determines the time advance of the target cell.

Optionally, the target cell may be a terrestrial cell or a non-terrestrial cell. When the target cell is a terrestrial cell, the network equipment corresponding to the target cell can be a base station; correspondingly, when the target cell is a non-terrestrial cell, the network equipment corresponding to the target cell can be a satellite, a high-altitude platform, or a drone.

Optionally, the time advance of the target cell is determined by the network device based on the location information of the terminal and the ephemeris parameters of the neighboring cells. Optionally, Figure 16 is a schematic flowchart of obtaining the timing advance of a target cell provided by an embodiment of the present application. As shown in Figure 16, it includes:

S0811. Receive the location information reported by the terminal.

S0812, obtain the ephemeris parameters of neighboring cells.

S0813: Obtain the time advance of the target cell based on the location information of the terminal and the ephemeris parameters of the neighboring cells.

In this embodiment, the source cell determines the target cell that matches the position of the terminal on the network device side by receiving the location information reported by the terminal and the ephemeris parameters of the neighboring cells, and based on the location information and the ephemeris parameters of the target cell, Determine the time advance of the corresponding target cell, thereby improving the smoothness of the terminal switching to the target cell.

Optionally, the ephemeris parameter includes at least one of the following: the spatial position of the cell corresponding to the earth, the speed of the cell corresponding to the earth, and the orbital parameters of the cell corresponding to the earth. Optionally, non-terrestrial network equipment can be satellites, high-altitude platforms, drones, etc. The spatial location of the non-terrestrial network cell, optionally, is the actual location of the satellite, for example. The location information of the terminal includes the global positioning and navigation system position of the terminal or the geocentric fixed coordinate system.

S082: The source cell sends configuration signaling to the terminal. The configuration signaling includes the time advance of the target cell, so that the terminal switches to the target cell in a non-random access manner based on the time advance of the target cell.

After the network device determines the time advance of the target cell, it carries the time advance in the configuration signaling and sends it to the terminal, so that the terminal can make adjustments based on the time advance of the target cell included in the configuration signaling, so as to avoid random access. Switch the entry mode to the target community.

Optionally, the configuration signaling may be radio resource control reconfiguration signaling or media access control layer control unit signaling.

Optionally, when the terminal fails to perform handover to the target cell without random access using the time advance amount, it switches to the target cell in a random access manner.

Optionally, after S082, the steps performed by the network device also include:

The source cell sends SN status transfer signaling to the target cell.

Optionally, the SN status transfer signaling contains the packet data convergence protocol sequence number (PDCP sequence number), so that the target cell can obtain the data transmission status of the source cell, so that after the terminal switches to the target cell, it can continue to transmit unfinished data.

In this embodiment, the source cell determines the time advance of the target cell that matches the position of the terminal by receiving the location information reported by the terminal and the ephemeris parameters of the neighboring cells, and sends the time advance of the target cell to the terminal for configuration. , the terminal no longer needs to perform random access steps, reduces the signaling overhead in the cell handover process, and improves the smoothness of the terminal's handover to the target cell.

Figure 17 is a signaling interaction diagram of the cell switching method shown in the seventh exemplary embodiment of the present application. The cell switching method provided by this application is executed by the network device corresponding to the source cell. As shown in Figure 17, the cell switching method provided by this embodiment includes the following steps:

S091. The source cell receives the location information reported by the terminal and obtains the ephemeris parameters of the neighboring cells.

S092: The source cell determines the first time advance based on the location information of the terminal and the ephemeris parameters of the neighboring cells.

S093: The source cell determines the difference time advance based on the first time advance and the time advance of the source cell.

S094. The source cell sends configuration signaling to the terminal. The configuration signaling contains the difference time advance, so that the terminal determines the time advance of the target cell based on the difference time advance, and determines the time advance of the target cell based on the time advance of the target cell without random access. Switch the entry mode to the target community.

Illustratively, in this embodiment, the specific implementation manner of determining the first time advance amount in steps S091-S092 is the same as the method of determining the target cell time advance amount in the embodiment shown in Figure 16. The first time advance amount in this embodiment is The time advance is the target time advance determined in the embodiment shown in Figure 16, which will not be described in detail here. For details, please refer to the introduction in the embodiment shown in Figure 16.

Optionally, the time advance of the source cell is the time advance when the terminal accesses the source cell (that is, currently). The source cell calculates the difference time advance by making a difference with the previously obtained first time advance, and sends the difference time advance to the terminal through configuration signaling, so that the terminal can restore the time advance based on the time advance of the source cell. The target time advance is obtained, and then the system is adjusted based on the target time advance to switch to the target cell in a non-random access manner. Since the signaling volume of the difference time advance is smaller than that of the target cell time advance, the target cell is sent to the terminal by transmitting the difference time advance and restoring it to the time advance of the target cell on the terminal side. The time advance can reduce the network load and reduce the data transmission load.

Optionally, the network device can require the terminal to report auxiliary information through the terminal auxiliary information through radio resource control reconfiguration signaling. The above requirements include at least one of the following: expected to increase/decrease the connection state discontinuous reception (Discontinuous Reception, DRX) length, overheating Overheating assistance information, discontinuous reception parameters for power saving preference, maximum aggregate bandwidth for power saving preference, Secondary Component Sarrier for power saving preference, SCC) number, the maximum number of multiple-input and multiple-output (MIMO) layers for power consumption and energy saving preference, the minimum scheduling offset of fast carrier scheduling for power consumption and energy saving preference, and the preferred RRC status , grant (Gtant) auxiliary information for test link (Sidelink) communication configuration, provide reference information, terminal location information

Optionally, the ephemeris parameter includes at least one of the following: the spatial position of the cell corresponding to the earth, the speed of the cell corresponding to the earth, and the orbital parameters of the cell corresponding to the earth. Non-terrestrial network equipment is, for example, satellites, high-altitude platforms, and drones. Optionally, the location information of the terminal includes the global positioning navigation system of the terminal.

Figure 18 is a signaling interaction diagram of the cell switching method shown in the eighth exemplary embodiment of the present application. The cell switching method provided by this application is executed by the network device corresponding to the source cell. As shown in Figure 18, the cell switching method provided by this embodiment includes the following steps:

S101. The source cell obtains the ephemeris parameters of the neighboring cells.

For example, the source cell communicates with neighboring cells. In a possible implementation, the source cell sends a handover request (Handover Request) to at least one neighboring cell, and obtains a handover request response (Handover Request) returned by each neighboring cell. Acknowledge), and obtain the real-time ephemeris parameters of the neighboring cell from the handover request response. In another possible implementation, the ephemeris parameters of each neighboring cell are pre-stored in the network equipment corresponding to the source cell, and synchronization is performed based on preset rules. For example, the source cell periodically synchronizes the ephemeris of neighboring cells at preset intervals. Parameters are synchronized.

S102. The source cell sends configuration signaling to the terminal. The configuration signaling contains the ephemeris parameters of the neighboring cells, so that the terminal determines the time advance of the target cell through the configuration signaling, and based on the time advance of the target cell, There is no random access method to switch to the target cell.

For example, after the source cell obtains the ephemeris parameters of each neighboring cell, it carries the ephemeris parameters of each neighboring cell in the configuration signaling and sends it to the terminal. After receiving the configuration signaling, the terminal can determine the target cell based on the ephemeris parameters included in the configuration signaling, and thereby obtain the time advance of the target cell. Afterwards, the terminal can adjust based on the timing advance of the target cell, and switch to the target cell in a non-random access manner.

Optionally, the radio resource control reconfiguration signaling includes ephemeris parameters of at least one neighboring cell, and the terminal confirms the target cell terminal to perform conditional handover based on the ephemeris parameters and/or conditional measurement parameters of the neighboring cells.

In this embodiment, the source cell obtains the ephemeris parameters of the neighboring cells and sends the ephemeris parameters of the neighboring cells to the terminal through configuration signaling. There is no need to perform time advance calculation on the source cell side, thereby reducing the calculation load of the source cell. , improve the stability of network equipment in scenarios where a large number of terminals access, and at the same time enable terminals to determine the time advance of the target cell based on the ephemeris parameters of neighboring cells, achieve cell handover without random access, and reduce the cost of cell handover during the cell handover process. This reduces the signaling overhead and improves the smoothness of the terminal's execution handover.

For the signaling interaction process between the source cell and the terminal in this embodiment, please refer to the signaling interaction process between the source cell and the terminal in the embodiment shown in Figure 8, which will not be described again here.

Figure 19 is a signaling interaction diagram of the cell switching method shown in the ninth exemplary embodiment of the present application. As shown in Figure 19, the cell switching method provided in this embodiment application includes the following steps:

S111. The source cell obtains the ephemeris parameters of at least one neighboring cell and the location information of the terminal.

Exemplarily, the network device corresponding to the source cell obtains the location information of the terminal through the location information reported by the terminal; and the source cell further obtains the ephemeris parameters of the neighboring cells. In one possible implementation, the source cell sends a handover request to at least one neighboring cell, obtains a handover request response returned by each neighboring cell, and obtains the real-time ephemeris parameters of the neighboring cell from the handover request response. In another possible implementation, the ephemeris parameters of each neighboring cell are pre-stored in the network equipment corresponding to the source cell, and synchronization is performed based on preset rules. For example, the source cell periodically synchronizes the ephemeris of neighboring cells at preset intervals. Parameters are synchronized.

Optionally, the ephemeris parameter includes at least one of the following: the spatial position of the cell corresponding to the earth, the speed of the cell corresponding to the earth, and the orbital parameter of the cell corresponding to the earth. Optionally, non-terrestrial network equipment can be satellites, high-altitude platforms, drones, etc. The spatial location of the non-terrestrial network equipment corresponding to the cell, optionally, for example, the actual location of satellites, high-altitude platforms, and drones. Optionally, the location information of the terminal includes the terminal's global positioning navigation system location or geocentric fixed coordinate system.

S112: The source cell determines the target cell based on the ephemeris parameter of at least one neighboring cell and the location information of the terminal.

For example, the source cell determines the neighboring cell that best matches the terminal as the target cell based on the ephemeris parameter and the location information of the terminal. In one possible implementation, the neighboring cell closest to the terminal is determined as the target cell based on the spatial position or the distance between the reference position of the network device (such as a satellite) corresponding to the neighboring cell and the position of the terminal.

In another possible implementation, the neighboring cell with the shortest time advance between the terminal and the neighboring cell is determined as the target cell.

S113. The source cell sends configuration signaling to the terminal, and the configuration signaling includes the ephemeris parameters of the target cell, so that the terminal determines the time advance of the target cell through the configuration signaling, and based on the time advance of the target cell, There is no random access method to switch to the target cell.

Exemplarily, after the target cell is determined, the ephemeris parameters of the target cell are obtained, and the ephemeris parameters of the target cell are carried in the configuration signaling and sent to the terminal. After receiving the configuration signaling, the terminal can obtain the ephemeris parameters of the target cell included in the configuration signaling. Afterwards, the terminal can directly calculate the time advance of the target cell based on the ephemeris parameters of the target cell and the terminal's own location information, and perform configuration based on the time advance of the target cell to switch to the target cell in a non-random access manner.

Optionally, the time advance of the target cell is confirmed based on at least one of terminal location information, neighboring cell ephemeris parameters, and source cell ephemeris parameters.

Optionally, the network device can require the terminal to report auxiliary information through the terminal auxiliary information through radio resource control reconfiguration signaling. The above requirements include at least one of the following: expected to increase/decrease the connection state discontinuous reception (Discontinuous Reception, DRX) length, overheating Overheating assistance information, discontinuous reception parameters for power saving preference, maximum aggregate bandwidth for power saving preference, Secondary Component Sarrier for power saving preference, SCC) number, the maximum number of multiple-input and multiple-output (MIMO) layers for power consumption and energy saving preference, the minimum scheduling offset of fast carrier scheduling for power consumption and energy saving preference, and the preferred RRC status , grant (Gtant) auxiliary information, provide reference information, and terminal location information for test link (Sidelink) communication configuration.

In this embodiment, after obtaining the ephemeris parameter of at least one neighboring cell, the network device corresponding to the source cell first filters the neighboring cells based on the location information of the terminal to obtain the cell that best matches the terminal, that is, the target cell. After that, The ephemeris parameters of the target cell are sent to the terminal for configuration through configuration signaling, which reduces the data processing volume and calculation load on the terminal side, reduces the time-consuming calculation of the time advance of the target cell, and enables the terminal to operate in a non-random access manner. Switching to the target cell reduces the signaling overhead during cell switching and improves the communication quality of the terminal.

Figure 20 is a signaling interaction diagram of the cell switching method shown in the tenth exemplary embodiment of the present application. The cell switching method provided by this application is executed by the network device corresponding to the source cell. As shown in Figure 20, the cell switching method provided by this embodiment includes the following steps:

S121. The source cell obtains the time advance effective period of the target cell.

S122. The source cell sends configuration signaling. The configuration signaling includes the time advance of the target cell and the corresponding valid period, so that the terminal switches to the target cell in a non-random access manner according to the time advance valid period of the target cell.

For example, the time advance valid period refers to the valid time interval corresponding to the cell time advance. If the current time (such as system time) is within the time advance valid period, the time advance is valid; if the current time is within the time advance valid period, the time advance is valid. When the amount is outside the effective period, the time advance amount is invalid. For example, the time advance valid period of the target cell is provided by the source cell, or is sent by the target cell to the source cell, and optionally forwarded to the terminal through the source cell.

Optionally, the target cell may be a terrestrial cell or a non-terrestrial cell. When the target cell is a non-ground cell, correspondingly, the network equipment corresponding to the target cell can be a satellite, a high-altitude platform, or a drone.

Optionally, when the configuration signaling includes the first switching information for instructing the terminal to perform cell switching with time-based CHO, the configuration signaling also includes the first moment and/or the second moment; when the configuration signaling includes In the second switching information, the configuration signaling includes a valid interval. Optionally, the second handover information is a conditional handover (that is, the source cell instructs the terminal to perform cell switching in a location-based CHO manner), or the second handover information is a general handover (that is, the source cell instructs the terminal to perform cell handover in a HO manner). During cell handover), the configuration signaling also includes the valid interval. For example, the first moment represents the starting moment of the valid period of the timing advance of the target cell; the second moment represents the end moment of the valid period of the timing advance of the target cell.

Optionally, the configuration signaling may be radio resource control reconfiguration signaling sent by the source cell to the terminal. If the source cell instructs the terminal to perform cell switching in the Timer-based CHO mode, the configuration signaling includes the first switching information, the first moment and/or the second moment, and the time advance is indicated by the first moment and/or the second moment. Valid period.

Optionally, if the source cell instructs the terminal to perform cell switching in the Location-based CHO mode, the configuration signaling also includes a newly introduced timer to indicate the time advance valid period of the target cell. In another possible implementation, the time advance validity period indicating the target cell is indicated by validity duration for UL sync information. If the source cell instructs the terminal to perform cell handover in HO mode, the configuration signaling also includes a newly introduced timer to indicate the time advance valid period of the target cell. In another possible implementation, the time advance validity period indicating the target cell is indicated by validity duration for UL sync information. Optionally, the newly introduced timer or validity duration for UL sync information is located in the target cell system message. Optionally, the target cell system information may be non-terrestrial network specific system information (NTN specific system information), such as but not limited to: system message 19 (SIB19).

In a possible implementation, the configuration signaling also includes the timing advance of the target cell. The configuration signaling sent by the source cell to the terminal includes the time advance of the target cell and the corresponding time advance valid period. After receiving the configuration signaling, the terminal determines the validity of the time advance of the target cell based on the time advance of the target cell and the corresponding time advance effective period. If the time advance of the target cell is valid, for example, the current system If the time is within the time advance valid period of the target cell, then based on the time advance, the system will switch to the target cell in a non-random access manner; if the time advance is invalid, for example, the current system time is outside the time advance valid period of the target cell, Then it is switched to the target cell in a random access manner. The specific implementation method is the same as the implementation method of enabling the terminal to switch to the target cell in a non-random access manner according to the time advance effective period of the target cell as described previously in this embodiment, and will not be described again here.

For the signaling interaction process between the source cell and the terminal in this embodiment, please refer to the signaling interaction process between the source cell and the terminal in the embodiment shown in Figure 10, which will not be described again here.

Figure 21 is a signaling interaction diagram of the cell switching method shown in the eleventh exemplary embodiment of the present application. As shown in Figure 21, the cell switching method provided in this embodiment application includes the following steps:

S131: The source cell obtains the ephemeris parameter of at least one neighboring cell and the time advance valid period corresponding to each neighboring cell.

S132. The source cell sends configuration signaling to the terminal. The configuration signaling includes the ephemeris parameters of the neighboring cell and the corresponding time advance valid period.

S133. The terminal determines the target cell, determines the time advance of the target cell based on the ephemeris parameters of the neighboring cells and the corresponding time advance valid period, and switches to the target cell in a non-random access manner based on the time advance of the target cell. .

Optionally, the radio resource control reconfiguration signaling includes ephemeris parameters and/or condition measurement parameters of at least one neighboring cell. The terminal confirms the target cell to perform conditional handover based on the ephemeris parameters and/or condition measurement parameters of the neighboring cell.

Optionally, the terminal calculates the distance between the terminal and each neighboring cell based on its own location information and the ephemeris parameter of at least one neighboring cell; then, the terminal filters neighboring cells that meet the distance condition, and then selects the neighboring cells that meet the filtering distance condition. In the cell, the signal-to-noise ratio of each neighboring cell is measured, and the neighboring cell with the highest signal-to-noise ratio is used as the target cell.

Optionally, the terminal calculates the distance between the terminal and each neighboring cell based on its own location information and the ephemeris parameter of at least one neighboring cell; then, the terminal filters neighboring cells that meet the distance condition, and then selects the neighboring cells that meet the filtering distance condition. In the cell, the results of at least two of the signal strength, signal quality, and signal-to-noise ratio of each neighboring cell are measured, and the neighboring cell with the best result is selected as the target cell.

In this embodiment, the source cell obtains the ephemeris parameter of the neighboring cell and the corresponding time advance valid period. After that, each ephemeris parameter and the corresponding time advance valid period are set as a set of data in the configuration signaling, and the configuration signaling is sent to the terminal. After receiving the configuration signaling, the terminal obtains the ephemeris parameters and time advance validity time corresponding to each neighboring cell, and then first determines the target cell, and then determines the target cell based on the ephemeris parameters and time advance validity time of the target cell. Time advance amount. Optionally, for a specific implementation method of determining the timing advance of the target cell, please refer to the introduction in the embodiment shown in FIG. 11 and FIG. 12 , which will not be described again here.

Figure 22 is a schematic structural diagram of a cell switching device provided by an embodiment of the present application.

The processing device provided by this application is applied to a terminal or is a terminal. As shown in Figure 22, the cell switching device 300 provided by this application includes:

Receiving unit 3001, used to receive configuration signaling;

The processing unit 3002 is configured to determine the timing advance of the target cell based on the configuration signaling;

The access unit 3003 is configured to switch to the target cell in a non-random access manner based on the time advance of the target cell.

Optionally, it includes at least one of the following: the configuration signaling is radio resource control reconfiguration signaling or media access control layer control unit signaling; the target cell is a non-terrestrial cell or a terrestrial cell; the target cell The time advance is determined based on at least one of terminal location information, neighboring cell ephemeris parameters, and source cell ephemeris parameters.

In an exemplary embodiment, the configuration signaling includes the timing advance of the target cell, and the processing unit 3002 is specifically configured to: obtain the timing advance of the target cell through configuration signaling; the access Unit 3003 is specifically configured to: send radio resource control reconfiguration completion signaling to the target cell to complete the cell handover process.

Optionally, the access unit 3003 is specifically configured to: synchronize with the target cell based on the physical layer parameters corresponding to the target cell; after the synchronization is successful, based on the time advance of the target cell, synchronize to the target cell. The cell sends UCI and/or receives DCI sent by the target cell.

Optionally, the access unit 3003 uses the physical layer configuration parameters of the target cell before the synchronization process and performs synchronization of the target cell or uses the physical layer configuration parameters of the target cell after the terminal synchronizes with the target cell.

Optionally, it also includes at least one of the following: the location information of the terminal includes the GNSS position of the terminal or the geocentric fixed coordinate system; the ephemeris parameter includes at least one of the following: the spatial position of the cell corresponding to the earth, and the speed of the cell corresponding to the earth. , the cell corresponds to the orbital parameters of the earth.

For specific implementation methods, please refer to the relevant introductions in the embodiments shown in Figures 6 and 7, and will not be described again here.

In an exemplary embodiment, the configuration signaling includes ephemeris parameters of neighboring cells. The processing unit 3002 is specifically configured to: determine the target cell based on the ephemeris parameters of the neighboring cells and the location information of the terminal. The amount of time advance.

Optionally, the processing unit 3002 restores the timing advance between the terminal and the target cell after performing compensation based on the obtained timing advance difference. The processing unit 3002 restores the timing advance between the terminal and the target cell based on the existing timing advance between the source cell and the obtained timing advance.

Optionally, non-terrestrial network equipment can be satellites, high-altitude platforms, drones, etc. The spatial location of the non-terrestrial network cell, optionally, is the actual location of the satellite, for example. The location information of the terminal includes the global positioning and navigation system position of the terminal or the geocentric fixed coordinate system.

For specific implementation methods, please refer to the relevant introductions in the embodiments shown in Figures 6 and 8, and will not be described again here.

In an exemplary embodiment, the configuration signaling includes a timing advance valid period of the target cell. The processing unit 3002 is specifically configured to obtain the time advance effective period of the target cell according to the configuration signaling. The access unit 3003 is specifically configured to: switch to the target cell in a non-random access manner according to the time advance effective period of the target cell.

Optionally, the configuration signaling includes the timing advance of the target cell and the corresponding timing advance valid period.

Optionally, the configuration signaling also includes the valid period of the time advance; when the configuration signaling includes the first switching information for instructing the terminal to perform cell switching with time-based CHO, the configuration signaling also includes the first moment. and/or the second moment; when the configuration signaling includes second switching information for instructing the terminal to perform cell switching using location-based CHO, or instructing the terminal to perform cell switching using HO, the configuration signaling also includes a valid interval .

Optionally, the configuration signaling includes handover information. When the processing unit 3002 obtains the time advance valid period of the target cell according to the configuration signaling, it is specifically configured to: if the handover information is the first handover information, the configuration The information also includes the first moment and/or the second moment, and the first moment and/or the second moment are the time advance valid period; if the switching information is the second switching information, according to the validity duration for UL sync information Or the timer information obtains the time advance amount valid period.

Optionally, when the access unit 3003 switches to the target cell in a non-random access manner according to the time advance effective period of the target cell, it is specifically used to: obtain the current system time. If the current system time is within the time advance of the target cell, Within the effective period of the time advance, the system switches to the target cell in a non-random access manner based on the time advance; if the current system time is outside the time advance effective period of the target cell, it switches to the target cell in a random access manner.

For specific implementation methods, please refer to the relevant introduction in the embodiment shown in Figure 10 and will not be described again here.

In an exemplary embodiment, the configuration signaling contains the ephemeris parameter of at least one neighboring cell and the corresponding time advance valid period. The processing unit 3002 is specifically configured to: according to the ephemeris parameter of the neighboring cell and the location of the terminal information to determine the time advance of the target cell. The access unit 3003 is specifically configured to: based on the current system time and the time advance valid period, determine whether the time advance of the target cell is in a valid state. If it is in a valid state, based on the time advance of the target cell, there will be no random access. Switch to the target cell in the access mode; if it is in an invalid state, switch to the target cell in the random access mode.

Optionally, the configuration signaling includes ephemeris parameters of at least one neighboring cell, and the terminal confirms the target cell to perform conditional handover based on the ephemeris parameters and/or conditional measurement parameters of the neighboring cells. Optionally, the conditional measurement parameters include at least one of the following: signal strength, signal quality, and signal-to-noise ratio.

For specific implementation methods, please refer to the relevant introduction in the embodiment shown in Figure 12 and will not be described again here.

The cell switching device 300 provided in this embodiment can execute the technical solutions of the method embodiments shown in any one of Figures 6 to 12. The implementation principles and technical effects are similar and will not be described again here.

Figure 23 is a schematic structural diagram of a cell switching device provided by an embodiment of the present application.

The cell switching device provided by this application is applied to the terminal or is the terminal. As shown in Figure 23, the cell switching device 400 provided by this application includes:

The access unit 4001 is configured to switch to the target cell in a non-random access manner based on preset parameters.

Optionally, the target cell is a non-terrestrial cell or a terrestrial cell.

Optionally, the access unit 4001 is specifically configured to: confirm the time advance based on preset parameters; and switch to the target cell in a non-random access manner based on the time advance.

Optionally, when the access unit 4001 switches to the target cell in a non-random access manner based on the time advance, it is specifically configured to synchronize with the target cell based on the physical layer parameters corresponding to the target cell. After successful synchronization, send uplink control information to the target cell based on the time advance of the target cell, and/or receive downlink control information sent by the target cell; send a radio resource control reconfiguration completion message to the target cell. command to complete the cell switching process.

Optionally, the cell switching device 400 also includes a receiving unit 4002, configured to: receive configuration signaling sent by the source cell; an access unit 4001, specifically configured to: obtain preset parameters according to the configuration signaling, and based on the preset parameters, Handover to the target cell without random access.

Optionally, the network device can require the terminal to report auxiliary information through terminal auxiliary information through radio resource control reconfiguration signaling. The above requirements include at least one of the following: Desiring to increase/decrease the connected state discontinuous reception length, overheating auxiliary information, and power consumption. Discontinuous reception parameters for energy-saving preference, maximum aggregate bandwidth for power-saving preference, number of second carriers for power-saving preference, maximum number of multiple-input multiple-output layers for power-saving preference, fast speed for power-saving preference Carrier scheduling minimum scheduling offset, preferred RRC status, grant auxiliary information for test link communication configuration, provision reference information, and terminal location information.

Optionally, the preset parameters also include a valid period of time advance.

Optionally, the access unit 4001 is specifically configured to: switch to the target cell in a non-random access manner according to the valid period of the time advance.

The cell switching device 400 provided in this embodiment can execute the technical solution of the method embodiment shown in Figure 13 or Figure 14. The implementation principles and technical effects are similar and will not be described again here.

Figure 24 is a schematic structural diagram of a cell switching device provided by an embodiment of the present application.

The processing device provided by this application is applied to the network equipment corresponding to the source cell or the network equipment. As shown in Figure 24, the cell switching device 500 provided by this application includes:

The transceiver unit 5001 is configured to send configuration signaling, so that the terminal determines the time advance of the target cell through the configuration signaling, and switches to the target cell in a non-random access manner based on the time advance of the target cell.

In an exemplary embodiment, the configuration signaling includes the time advance of the target cell, and the cell switching device 500 further includes a processing unit 5002, specifically configured to: based on the ephemeris parameters of the neighboring cells and the location information of the terminal , determine the time advance of the target cell.

Optionally, the transceiver unit 5001 is also used to: receive the location information reported by the terminal; the processing unit 5002 is specifically used to: obtain the ephemeris parameters of the neighboring cells, and obtain the target according to the location information of the terminal and the ephemeris parameters of the neighboring cells. The time advance of the community.

Optionally, the transceiver unit 5001 is also used to send SN status transfer signaling to the target cell. Optionally, the SN status transfer signaling contains the packet data convergence protocol sequence number (PDCP sequence number), so that the target cell can obtain the data transmission status of the source cell, so that after the terminal switches to the target cell, it can continue to transmit unfinished data. For specific implementation methods, please refer to the relevant introduction in the embodiment shown in Figure 15 and will not be described again here.

In an exemplary embodiment, the transceiver unit 5001 is also configured to: receive the location information reported by the terminal and obtain the ephemeris parameters of the neighboring cells; the processing unit 5002 is specifically configured to: based on the location information of the terminal and the ephemeris parameters of the neighboring cells. The first time advance is determined based on the historical parameters; the difference time advance is determined based on the first time advance and the time advance of the source cell. The transceiver unit 5001 is specifically used to: send configuration signaling to the terminal. The configuration signaling contains the difference time advance, so that the terminal determines the time advance of the target cell based on the difference time advance, and determines the time advance of the target cell based on the difference time advance. Handover to the target cell without random access.

For specific implementation methods, please refer to the relevant introduction in the embodiment shown in Figure 17 and will not be described again here.

In an exemplary embodiment, the transceiver unit 5001 is also configured to: obtain the ephemeris parameters of neighboring cells; send configuration signaling to the terminal, where the configuration signaling contains the ephemeris parameters of the neighboring cells, so that the terminal can pass the configuration The signaling determines the time advance of the target cell, and switches to the target cell in a non-random access manner based on the time advance of the target cell.

Optionally, the configuration signaling is radio resource control reconfiguration signaling. The radio resource control reconfiguration signaling includes the ephemeris parameter of at least one neighboring cell. The terminal confirms the conditions to be executed based on the ephemeris parameter of the neighboring cell and/or the condition measurement parameter. The target cell terminal for handover.

Optionally, the conditional measurement parameters include at least one of the following: signal strength, signal quality, and signal-to-noise ratio.

For specific implementation methods, please refer to the relevant introduction in the embodiment shown in Figure 18 and will not be described again here.

In an exemplary embodiment, the transceiver unit 5001 is further configured to: obtain the ephemeris parameter of at least one neighboring cell and the location information of the terminal; the processing unit 5002 is further configured to: obtain the ephemeris parameter of at least one neighboring cell and the location information of the terminal. The location information of the terminal is used to determine the target cell; the transceiver unit 5001 is specifically used to: send configuration signaling to the terminal, and include the ephemeris parameters of the target cell in the configuration signaling, so that the terminal can determine the target cell in advance through the configuration signaling. amount, and switches to the target cell in a non-random access manner based on the time advance of the target cell.

For specific implementation methods, please refer to the relevant introduction in the embodiment shown in Figure 19, and will not be described again here.

In an exemplary embodiment, the transceiver unit 5001 is specifically configured to: obtain the time advance effective period of the target cell; send configuration signaling, where the configuration signaling includes the time advance of the target cell and the corresponding effective period, so as to The terminal is allowed to switch to the target cell in a non-random access manner according to the time advance effective period of the target cell.

Optionally, when the configuration signaling includes the first switching information for instructing the terminal to perform cell switching with time-based CHO, the configuration signaling also includes the first moment and/or the second moment; when the configuration signaling includes In the second switching information, the configuration signaling includes a valid interval. Optionally, the second handover information is a conditional handover (i.e., the source cell instructs the terminal to perform cell switching in a location-based CHO mode), or the second handover information is a general handover (i.e., the source cell instructs the terminal to perform cell switching in a HO mode). During cell handover), the configuration signaling also includes the valid interval. For example, the first moment represents the starting moment of the valid period of the timing advance of the target cell; the second moment represents the end moment of the valid period of the timing advance of the target cell.

Optionally, the configuration signaling also includes the time advance of the target cell, and the configuration signaling sent by the source cell to the terminal includes the time advance of the target cell and the corresponding time advance valid period.

For specific implementation methods, please refer to the relevant introduction in the embodiment shown in Figure 20 and will not be described again here.

In an exemplary embodiment, the transceiver unit 5001 is specifically configured to: obtain the ephemeris parameter of at least one neighboring cell and the time advance valid period corresponding to each neighboring cell; and send configuration signaling to the terminal, where the configuration signaling contains The ephemeris parameters of neighboring cells and the corresponding time advance effective period.

Optionally, the configuration signaling includes ephemeris parameters and/or condition measurement parameters of at least one neighboring cell, and the terminal confirms the target cell to perform conditional handover based on the ephemeris parameters and/or condition measurement parameters of the neighboring cell.

The conditional measurement parameters include at least one of the following: signal strength, signal quality, and signal-to-noise ratio.

For specific implementation methods, please refer to the relevant introduction in the embodiment shown in Figure 21 and will not be described again here.

The cell switching device 400 provided in this embodiment can execute the technical solutions of the method embodiments shown in any one of Figures 15 to 21. The implementation principles and technical effects are similar and will not be described again here.

Figure 25 is a structural diagram of a communication device according to an exemplary embodiment of the present application.

As shown in Figure 25, the communication device 600 provided in this embodiment includes:

memory 6001;

Processor 6002; and,

Computer program.

Optionally, the computer program is stored in the memory 6001 and configured to be executed by the processor 6002 to implement the cell switching method shown in any of the above embodiments.

Embodiments of the present application also provide a computer-readable storage medium. A computer program is stored on the computer-readable storage medium. When the computer program is executed by a processor, the steps of the cell switching method in any of the above embodiments are implemented.

In the embodiments of mobile terminals, communication devices and computer-readable storage media provided by this application, all technical features of any of the above-mentioned cell handover method embodiments can be included. The expansion and explanation content of the description is basically the same as that of each embodiment of the above-mentioned method. , which will not be described in detail here.

Embodiments of the present application also provide a computer program product. The computer program product includes computer program code. When the computer program code is run on a computer, it causes the computer to execute the methods in the above various possible implementations.

Embodiments of the present application also provide a chip, which includes a memory and a processor. The memory is used to store a computer program. The processor is used to call and run the computer program from the memory, so that the device equipped with the chip executes the above various possible implementations. Methods.

It can be understood that the above scenarios are only examples and do not constitute a limitation on the application scenarios of the technical solutions provided by the embodiments of the present application. The technical solutions of the present application can also be applied to other scenarios. For example, those of ordinary skill in the art know that with the evolution of system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. A computer program product includes one or more computer instructions. When computer program instructions are loaded and executed on a computer, processes or functions according to embodiments of the present application are generated in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device. Computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, e.g., computer instructions may be transmitted from a website, computer, server or data center via a wired link (e.g. Coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means to transmit to another website site, computer, server or data center. Computer-readable storage media can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or other integrated media that contains one or more available media. Available media may be magnetic media (eg, floppy disk, hard disk, tape), optical media (eg, DVD), or semiconductor media (eg, solid state disk, SSD), etc.

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

In this application, the same or similar terms, concepts, technical solutions and/or application scenario descriptions are generally only described in detail the first time they appear. When they appear again later, for the sake of simplicity, they are generally not described again. When understanding the technical solutions and other content of this application, for the same or similar term concepts, technical solutions and/or application scenario descriptions that are not described in detail later, you can refer to the relevant previous detailed descriptions.

In this application, each embodiment is described with its own emphasis. For parts that are not detailed or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

The technical features of the technical solution of the present application can be combined in any way. In order to simplify the description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, all possible combinations can be used. It should be considered to be within the scope of description in this application.

Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus the necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is better. implementation. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence or that contributes to the existing technology. The computer software product is stored in one of the above storage media (such as ROM/RAM, magnetic disc, optical disk), including several instructions to cause a terminal device (which can be a mobile phone, a computer, a server, a controlled terminal, or a network device, etc.) to execute the method of each embodiment of the present application.

The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of the present application may be directly or indirectly used in other related technical fields. , are all equally included in the patent protection scope of this application.

Claims

A cell switching method, which includes the following steps:

S1: Determine the time advance of the target cell based on configuration signaling;

S2: Based on the time advance, establish non-random access with the target cell.
The method according to claim 1, comprising at least one of the following:

The configuration signaling is a radio resource control reconfiguration or a media access control layer control unit;

The target cell is a non-terrestrial cell or a terrestrial cell;

The time advance of the target cell is confirmed based on at least one of terminal location information, neighboring cell ephemeris parameters, and source cell ephemeris parameters.
The method according to claim 1, wherein the configuration signaling includes ephemeris parameters of neighboring cells, and the step S1 includes:

The time advance is determined based on the ephemeris parameters and position information.
The method according to any one of claims 1 to 3, wherein step S2 includes:

Synchronize with the target cell;

After successful synchronization, uplink control information is sent to the target cell based on the time advance of the target cell and/or physical layer parameters of the target cell, and/or downlink control information sent by the target cell is received.
The method according to any one of claims 1 to 3, further comprising at least one of the following:

The configuration signaling also includes a valid period of time advance;

When the configuration signaling includes first switching information for instructing the terminal to perform cell switching with time-based conditional switching, the configuration signaling also includes the first moment and/or the second moment;

When the configuration signaling includes second handover information used to instruct the terminal to perform cell handover with location-based condition handover, or instructs the terminal to perform cell handover with handover, the configuration signaling also includes a valid interval.
A cell switching method, wherein the method includes the following steps:

S10: Based on the preset parameters, establish non-random access with the target cell.
The method according to claim 6, comprising at least one of the following:

The preset parameters include at least one of location information, neighbor cell ephemeris parameters and source cell ephemeris parameters;

The target cell is a non-terrestrial cell or a terrestrial cell.
The method according to claim 7, wherein the neighbor cell ephemeris parameters and/or the source cell ephemeris parameters are determined by configuration signaling.
The method according to claim 8, further comprising at least one of the following:

The configuration signaling also includes a valid period of time advance;

When the configuration signaling includes first switching information for instructing the terminal to perform cell switching with time-based conditional switching, the configuration signaling also includes the first moment and/or the second moment;

When the configuration signaling includes second handover information used to instruct the terminal to perform cell handover with location-based condition handover, or instructs the terminal to perform cell handover with handover, the configuration signaling also includes a valid interval.
The method according to any one of claims 6 to 9, wherein step S10 includes:

The time advance is confirmed based on the preset parameters, and non-random access is established with the target cell based on the time advance.
The method according to any one of claims 6 to 9, wherein establishing non-random access with the target cell includes:

Synchronize with the target cell;

After successful synchronization, uplink control information is sent to the target cell based on the time advance of the target cell and/or physical layer parameters of the target cell, and/or downlink control information sent by the target cell is received.
A cell switching method, wherein the method includes:

Send configuration signaling, so that the terminal determines the time advance of the target cell through the configuration signaling, and establishes non-random access with the target cell based on the time advance of the target cell.
The method of claim 12, comprising at least one of the following:

The configuration signaling is a radio resource control reconfiguration or a media access control layer control unit;

The target cell is a non-terrestrial cell or a terrestrial cell;

The time advance of the target cell is confirmed based on at least one of terminal location information, neighboring cell ephemeris parameters, and source cell ephemeris parameters.
The method according to claim 12, wherein the configuration signaling includes a time advance of the target cell, the method further comprising:

Based on the ephemeris parameters of the neighboring cells and the location information of the terminal, the time advance of the target cell is determined.
The method according to any one of claims 12 to 14, wherein establishing non-random access with the target cell based on the time advance of the target cell includes:

Synchronize the terminal with the target cell;

After successful synchronization, uplink control information is sent to the target cell based on the time advance of the target cell and/or physical layer parameters of the target cell, and/or downlink control information sent by the target cell is received.
The method according to any one of claims 12 to 14, further comprising at least one of the following:

The location information of the terminal includes the global navigation satellite system location of the terminal;

The ephemeris parameters include at least one of the following: the spatial position of the cell corresponding to the earth, the speed of the cell corresponding to the earth, and the orbital parameters of the cell corresponding to the earth.
The method according to any one of claims 12 to 14, further comprising at least one of the following:

The configuration signaling also includes a valid period of time advance;

When the configuration signaling includes first switching information for instructing the terminal to perform cell switching with time-based conditional switching, the configuration signaling also includes the first moment and/or the second moment;

When the configuration signaling includes second handover information used to instruct the terminal to perform cell handover with location-based condition handover, or instructs the terminal to perform cell handover with handover, the configuration signaling also includes a valid interval.
A communication device, which includes: a memory and a processor, wherein a cell switching program is stored on the memory, and when the cell switching program is executed by the processor, the cell switching program implements the method according to any one of claims 1 to 17. The steps of the cell handover method described above.
A computer-readable storage medium, wherein a computer program is stored on the storage medium, and when the computer program is executed by a processor, the steps of the cell switching method as claimed in claim 1, 6, or 12 are implemented.
A computer program product, including a computer program, which implements the cell switching method described in claim 1, 6, or 12 when executed by a processor.