WO2024221471A1

WO2024221471A1 - Control method, communication device, and storage medium

Info

Publication number: WO2024221471A1
Application number: PCT/CN2023/091883
Authority: WO
Inventors: 黎添
Original assignee: 上海传英信息技术有限公司
Priority date: 2023-04-28
Filing date: 2023-04-28
Publication date: 2024-10-31

Abstract

According to the technical solution of the present application, downlink synchronization is performed on a candidate cell on the basis of first downlink information and/or downlink synchronization information, so that a terminal device can acquire or obtain downlink synchronization information of the candidate cell before receiving a cell handover command, and then performs a downlink synchronization operation on the basis of the first downlink information, thereby reducing the waiting time after the cell handover command is received, and reducing the delay in the cell handover process.

Description

Control method, communication device and storage medium

Technical Field

The present application relates to the field of communication technology, and in particular to a control method, communication equipment and storage medium.

Background Art

In the mobility scenario of the existing protocol, the terminal device performs downlink synchronization operation only after receiving the cell switching command, which includes measuring the synchronization broadcast block of the target cell to obtain time and frequency synchronization with the target cell, and detecting the physical layer cell ID of the target cell. Since the downlink synchronization operation is performed only after receiving the cell switching command, a long waiting time is required, resulting in a long delay in executing the cell switching.

Therefore, it is necessary to propose a solution to reduce the delay in the cell switching process.

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

Technical Solutions

The main purpose of the present application is to provide a control method, a communication device and a storage medium, aiming to reduce the delay in the cell switching process.

To achieve the above purpose, the present application provides a control method, which can be applied to a terminal device (such as a mobile phone), comprising the steps of:

S4: Perform downlink synchronization on the candidate cell based on the first downlink information and/or the downlink synchronization information.

Optionally, the method further comprises:

S3: Acquire or obtain downlink synchronization information based on the second downlink information.

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

Select or determine a candidate cell according to the candidate cell indication medium access control layer control unit and/or downlink control information, and acquire or obtain downlink synchronization information of the candidate cell;

The measurement result of the candidate cell is determined according to the downlink signal, and the downlink synchronization information corresponding to the candidate cell whose measurement result meets the preset condition is acquired or obtained.

Optionally, the method comprises at least one of the following:

The satisfying of the preset condition includes: an offset value of the measurement result of the candidate cell is greater than or equal to the measurement result of the source cell, and/or the measurement result of the candidate cell is greater than or equal to a preset threshold value;

The acquiring or obtaining the downlink synchronization information of the candidate cell includes: acquiring or obtaining the downlink synchronization information of the candidate cell according to a time unit of a reference cell based on a preset rule.

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

The reference cell includes at least one of the following: a source cell, a cell that is on the same frequency carrier as the candidate cell and has been detected, a special cell of a cell group corresponding to the candidate cell, and a reference cell configured by a network device;

The preset rules include at least one of the following: the number of time slots included in the time difference between frames with the same number between the candidate cell and the reference cell is determined by the value of the time slot number field; the number of symbols included in the time difference between frames with the same number between the candidate cell and the reference cell is determined by the value of the symbol number field; the number of sampling intervals included in the time difference between frames with the same number between the candidate cell and the reference cell is determined by the value of the sampling interval number field and/or the sampling interval number factor.

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

The first downlink information includes a physical downlink control channel command and/or a cell switching command;

The downlink synchronization information includes at least one of a candidate cell identification field, an advance reference cell determination field, an intra-frequency candidate cell determination field, a subframe number field, a time slot number field, a symbol number field, and a sampling interval number field;

Save, update or clear downlink synchronization information;

The second downlink information includes at least one of a candidate cell indication medium access control layer control unit, downlink control information and a downlink signal.

Optionally, saving, updating, or clearing downlink synchronization information of the candidate cell includes at least one of the following:

In response to detecting or receiving a new synchronization broadcast block, saving or updating downlink synchronization information of the candidate cell, and/or restarting a downlink synchronization information validity timer corresponding to the candidate cell;

In response to the downlink synchronization information validity timer corresponding to the candidate cell expiring, clearing the downlink synchronization information of the candidate cell;

In response to sending or receiving the indication information, clearing downlink synchronization information of candidate cells other than the candidate cell corresponding to the indication information;

In response to completing downlink synchronization and/or receiving a confirmation indication, clearing downlink synchronization information of the corresponding candidate cell.

The present application also provides a control method, which can be applied to a network device (such as a base station), comprising the steps of:

S2: Send the first downlink information so that the terminal device performs downlink synchronization on the candidate cell based on the first downlink information and/or downlink synchronization information.

Optionally, the method further comprises:

S1: Send the second downlink information so that the terminal device acquires or obtains the downlink synchronization information based on the second downlink information.

Optionally, the method comprises at least one of the following:

Optionally, the step of the terminal device acquiring or obtaining downlink synchronization information based on the second downlink information includes at least one of the following:

The terminal device selects or determines a candidate cell according to the candidate cell indication medium access control layer control unit and/or downlink control information, and obtains Obtain or obtain downlink synchronization information of the candidate cell;

The terminal device determines the measurement result of the candidate cell according to the downlink signal, and obtains or acquires the downlink synchronization information corresponding to the candidate cell whose measurement result meets the preset conditions.

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

The present application also provides a 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 any of the control methods described above are implemented.

The technical solution of the present application performs downlink synchronization on the candidate cell based on the first downlink information and/or downlink synchronization information, so that the terminal device can obtain or get the downlink synchronization information of the candidate cell before receiving the cell switching command, and then perform downlink synchronization operations in combination with the first downlink information, thereby reducing the waiting time after receiving the cell switching command, thereby reducing the delay in the cell switching process.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

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

FIG2 is a diagram of a communication network system architecture provided in an embodiment of the present application;

FIG3 is a schematic diagram of a hardware structure of a controller 140 provided in the present application;

FIG4 is a schematic diagram of the hardware structure of a network node 150 provided in the present application;

FIG5 is a schematic flow chart of a control method according to the first embodiment;

FIG6 is a schematic flow chart of a control method according to a second embodiment;

FIG7 is a schematic diagram of a first example of a control method according to the second embodiment;

FIG8 is a second exemplary schematic diagram of a control method according to the second embodiment;

FIG9 is a schematic diagram of a third example of a control method according to the second embodiment;

FIG10 is a schematic diagram of a fourth example of a control method according to the second embodiment;

FIG11 is a schematic flow chart of a control method according to a third embodiment;

FIG12 is a schematic flow chart of a control method according to a fourth embodiment;

FIG13 is a schematic flow chart of a control method according to a fifth embodiment;

FIG14 is a schematic diagram of a first example of a control method according to the seventh embodiment;

FIG15 is a schematic diagram of a second example of a control method according to the seventh embodiment;

FIG16 is a third exemplary schematic diagram of a control method according to the seventh embodiment;

FIG17 is a schematic diagram of a fourth example of a control method according to the seventh embodiment;

FIG18 is a schematic flow chart of a control method according to a ninth embodiment;

FIG19 is a schematic diagram of a first interaction sequence according to the tenth embodiment;

FIG20 is a schematic diagram of a second interaction sequence according to the tenth embodiment;

FIG21 is a first structural diagram of a control device provided in an embodiment of the present application;

FIG22 is a second structural schematic diagram of a control device provided in an embodiment of the present application;

FIG23 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application.

The realization of the purpose, functional features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. The above-mentioned drawings have shown clear embodiments of this application, which will be described in more detail later. These drawings and textual descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments.

Embodiments of the present application

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

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

It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this document, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining". Furthermore, as used herein, the singular forms "a", "an" and "an" are used interchangeably. "and" are intended to include plural forms as well, unless there is an indication to the contrary in the context. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, steps, operations, elements, components, items, kinds, and/or groups, but do not exclude the presence, occurrence or addition of one or more other features, steps, operations, elements, components, items, kinds, 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 one of the following: A; B; C; A and B; A and C; B and C; A and B and C", and for example, "A, B or C" or "A, B and/or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A and B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

It should be understood that, although the various steps in the flowchart in the embodiment of the present application are displayed in sequence according to the indication of the arrows, these steps are not necessarily performed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and it can be performed in other orders. Moreover, at least a portion of the steps in the figure may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and their execution order is not necessarily performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

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

It should be noted that in this article, step codes such as S1 and S2 are used for the purpose of expressing the corresponding content more clearly and concisely, and do not constitute a substantial limitation on the order. When implementing the step, those skilled in the art may execute S2 first and then S1, etc., but these should all be within the scope of protection of this application.

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

In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present application, and have no specific meanings. Therefore, "module", "component" or "unit" can be used in a mixed manner.

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

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

The subsequent description will be made by taking a mobile terminal as an example, and those skilled in the art will understand that, in addition to components specifically used for mobile purposes, the construction according to the embodiments of the present application can also be applied to fixed-type terminal devices.

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

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

The radio frequency unit 101 can be used for receiving and sending signals during information transmission or communication. Specifically, after receiving the downlink information of the base station, it is sent to the processor 110 for processing; 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, a transceiver, a coupler, a low noise amplifier, a duplexer, etc. In addition, the radio frequency unit 101 can also communicate with the network and other devices through wireless communication. The above-mentioned wireless communications may use any communication standard or protocol, including but not limited to GSM (Global System of Mobile communication), GPRS (General Packet Radio Service), CDMA2000 (Code Division Multiple Access 2000), WCDMA (Wideband Code Division Multiple Access), TD-SCDMA (Time Division Synchronous Code Division Multiple Access), FDD-LTE (Frequency Division Duplexing-Long Term Evolution), TDD-LTE (Time Division Duplexing-Long Term Evolution), 5G and 6G, etc.

WiFi is a short-range wireless transmission technology. The mobile terminal can help users send and receive emails, browse web pages, and access streaming media through the WiFi module 102, which provides users with wireless broadband Internet access. Although FIG1 shows the WiFi module 102, it is understandable 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 can convert the audio data received by the RF unit 101 or the WiFi module 102 or stored in the memory 109 into an audio signal and output it as sound when the mobile terminal 100 is in a call signal reception mode, a talk mode, a recording mode, a voice recognition mode, a broadcast reception mode, etc. Moreover, the audio output unit 103 can also provide audio output related to a specific function performed by the mobile terminal 100 (for example, a call signal reception sound, a message reception sound, etc.). The audio output unit 103 may include a speaker, a buzzer, etc.

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 (GPU) 1041 and a microphone 1042, and the graphics processor 1041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The processed image frame can be displayed on the display unit 106. The image frame processed by the graphics processor 1041 can be stored in the memory 109 (or other storage medium) or sent via the radio frequency unit 101 or the WiFi module 102. The microphone 1042 can receive sound (audio data) via the microphone 1042 in a telephone call mode, a recording mode, a voice recognition mode, and other operating modes, and can process such sound into audio data. The processed audio (voice) data can be converted into a format output that can be sent to a mobile communication base station via the radio frequency unit 101 in the case of a telephone call mode. The microphone 1042 can implement various types of noise elimination (or suppression) algorithms to eliminate (or suppress) noise or interference generated in the process of receiving and sending 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, and the proximity sensor can turn off the display panel 1061 and/or the backlight when the mobile terminal 100 is moved to the ear. As a type of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in all directions (generally three axes), and can detect the magnitude and direction of gravity when stationary. It can be used for applications that identify the posture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer, tapping), etc.; as for other sensors that can be configured on the mobile phone, such as fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., they will not be repeated 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 can be used to receive input digital or character information and generate information related to user settings and function control of the mobile terminal. The key signal input of the key. 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 operation on or near it (such as the user's operation on the touch panel 1071 or near the touch panel 1071 using any suitable object or accessory such as a finger, stylus, etc.), and drive the corresponding connection device according to a pre-set program. The touch panel 1071 may include two parts: a touch detection device and a touch controller. Optionally, the touch detection device detects the user's touch 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, converts it into the contact point coordinates, and then sends it to the processor 110, and can receive and execute the command sent by the processor 110. In addition, the touch panel 1071 can be implemented in various types such as resistive, capacitive, infrared and surface acoustic waves. 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 a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, etc., which are not specifically limited here.

Optionally, the touch panel 1071 may 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 provides a corresponding visual output on the display panel 1061 according to the type of the touch event. Although in FIG. 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 to implement the input and output functions of the mobile terminal, which is not limited to the specifics herein.

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

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

The processor 110 is the control center of the mobile terminal. It uses various interfaces and lines to connect various parts of the entire mobile terminal. It executes various functions of the mobile terminal and processes data by running or executing software programs and/or modules stored in the memory 109, and calling data stored in the memory 109, so as to monitor the mobile terminal as a whole. 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, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned 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) for supplying power to various components. Preferably, the power supply 111 may be logically connected to the processor 110 via a power management system, thereby implementing functions such as charging, discharging, and power consumption management through the power management system.

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

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

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

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

EPC203 may include MME (Mobility Management Entity) 2031, HSS (Home Subscriber Server) 2032, other MMEs 2033, SGW (Serving Gate Way) 2034, PGW (PDN Gate Way) 2035 and PCRF (Policy and Charging Rules Function) 2036. Optionally, MME 2031 is a control node that processes signaling between UE 201 and EPC 203, providing bearer and connection management. HSS 2032 is used to provide some registers to manage functions such as home location register (not shown in the figure), and save some user-specific information such as service features and data rates. All user data can be sent through SGW2034. PGW2035 can provide IP address allocation and other functions for UE 201. PCRF2036 is the policy and charging control policy decision point for service data flow and IP bearer resources. It selects and provides available policy and charging control decisions for the policy and charging execution functional unit (not shown in the figure).

IP service 204 may include the Internet, intranet, IMS (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 the present application is not only applicable to the LTE system, but also to other wireless communication systems, such as GSM, CDMA2000, WCDMA, TD-SCDMA, 5G and future new network systems (such as 6G), etc., without limitation here.

Fig. 3 is a schematic diagram of the hardware structure of a controller 140 provided in the present application. The controller 140 includes: a memory 1401 and a processor 1402, the memory 1401 is used to store program instructions, and the processor 1402 is used to call the program instructions in the memory 1401 to execute the steps performed by the controller in the first embodiment of the above method, and its implementation principle and beneficial effects are similar, which will not be repeated here.

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

Fig. 4 is a schematic diagram of the hardware structure of a network node 150 provided by the present application. The network node 150 includes: a memory 1501 and a processor 1502, the memory 1501 is used to store program instructions, and the processor 1502 is used to call the program instructions in the memory 1501 to execute the steps performed by the first node in the first embodiment of the above method, and its implementation principle and beneficial effects are similar, which will not be repeated here.

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

The above-mentioned integrated module implemented in the form of a software function module can be stored in a computer-readable storage medium. The above-mentioned software function module is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (English: processor) to perform some steps of the methods of various embodiments of the present application.

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

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

First embodiment

5 is a schematic flow chart of a control method according to a first embodiment. The control method can be applied to a terminal device (such as a mobile phone), and includes the following steps:

In an embodiment of the present application, the terminal device can perform downlink synchronization on the candidate cell based on the first downlink information and/or downlink synchronization information. Optionally, the first downlink information is sent by the network device to the terminal device, and the downlink synchronization information can be acquired or obtained by the terminal device based on the second downlink information sent by the network device.

Optionally, the first downlink information includes a physical downlink control channel order (PDCCH order, Physical Downlink Control Channel order) and/or a cell switching command.

Optionally, after the terminal device receives the first downlink information, the candidate cell indicated by the first downlink information can be called a target cell.

Optionally, the downlink synchronization information includes at least one of a candidate cell identification field, an advance-to-reference cell determination field, an intra-frequency candidate cell determination field, a subframe number field, a time slot number field, a symbol number field, and a sampling interval number field.

Optionally, the second downlink information includes at least one of a candidate cell indication medium access control layer control element (MAC CE, Media Access Control Control Element), downlink control information (Downlink Control Information, DCI,) and a downlink signal.

Optionally, the terminal device reports to the network device the capability value of storing downlink synchronization information of candidate cells, i.e., the maximum number of candidate cells for which the terminal device stores downlink synchronization information of candidate cells, and measures downlink signals of the candidate cells, and then reports the measurement results to the network device.

Optionally, the network device selects or determines a candidate cell, and indicates to the terminal device through MAC CE the candidate cell that needs to perform downlink synchronization and obtain or get downlink synchronization information.

Optionally, the terminal device performs downlink synchronization on the candidate cell indicated in the MAC CE and obtains or acquires downlink synchronization information corresponding to the candidate cell.

Optionally, the terminal device measures the downlink signal of the candidate cell and reports the measurement result to the network device.

Optionally, the network device selects or determines a candidate cell, and indicates to the terminal device the candidate cell that needs to perform downlink synchronization and obtain or acquire downlink synchronization information by adding a candidate cell identifier in the DCI.

Optionally, the terminal device performs downlink synchronization on the candidate cell indicated in the DCI and acquires or obtains downlink synchronization information corresponding to the candidate cell.

Optionally, the terminal device acquires or obtains downlink synchronization information corresponding to a candidate cell whose measurement results meet preset conditions. Optionally, meeting the preset conditions includes that the offset value of the measurement result of the candidate cell is greater than or equal to the measurement result of the source cell, and/or the measurement result of the candidate cell is greater than or equal to a preset threshold value.

Optionally, the terminal device acquires or obtains the downlink synchronization information of the candidate cell based on preset rules and according to the time unit of the reference cell. Optionally, the reference cell includes at least one of the source cell, a cell that is on the same frequency carrier as the candidate cell and has been detected, a special cell of the cell group corresponding to the candidate cell, and a reference cell configured by the network device.

Optionally, the preset rule includes at least one of the following:

The number of time slots included in the time difference between the frames with the same number of the candidate cell and the reference cell is determined by the value of the time slot number field;

The number of symbols contained in the time difference between the frames with the same number of the candidate cell and the reference cell is determined by the value of the symbol number field;

The number of sampling intervals included in the time difference between the frames with the same number of the candidate cell and the reference cell is determined by the value of the sampling interval number field and/or the sampling interval number factor.

Optionally, the terminal device may acquire or obtain the downlink synchronization information of the candidate cell based on the time unit boundary of the reference cell and the timing relationship of the candidate cell, or may determine the downlink synchronization information of the candidate cell based on the synchronization broadcast block index value of the candidate cell.

Optionally, the terminal device may also save, update or clear the downlink synchronization information of the candidate cell.

Optionally, the downlink synchronization information saved by the terminal device is usually time-sensitive. If the terminal device detects or receives a synchronization broadcast block of a candidate cell, the downlink synchronization information of the candidate cell can be saved based on the synchronization broadcast block. If the terminal device detects or receives a new synchronization broadcast block, the old downlink synchronization information of the candidate cell can be cleared, and the latest downlink synchronization information of the candidate cell can be saved based on the latest synchronization broadcast block. The terminal device performs downlink synchronization on the candidate cell based on the latest downlink synchronization information.

Optionally, if the downlink synchronization information saved by the terminal device exceeds the validity duration of the downlink synchronization information, it means that the saved downlink synchronization information is invalid, and the terminal device cannot perform downlink synchronization on the candidate cell based on the saved downlink synchronization information. The downlink synchronization information of the candidate cell can be cleared.

Optionally, if the terminal device receives indication information from the network device or sends indication information to the network device, the terminal device may clear the downlink synchronization information of other candidate cells except the candidate cell corresponding to the indication information.

Optionally, if the terminal device completes downlink synchronization of the target cell according to the downlink synchronization information, and/or the terminal device receives a confirmation indication from the network device regarding the cell switching confirmation message sent to the target cell, the terminal device can clear the downlink synchronization information of the corresponding candidate cell.

This embodiment adopts the above scheme, specifically by performing downlink synchronization on the candidate cell based on the first downlink information and/or downlink synchronization information, so that the terminal device can obtain or get the downlink synchronization information of the candidate cell before receiving the cell switching command, and perform downlink synchronization operations in combination with the first downlink information, thereby reducing the waiting time after receiving the cell switching command, thereby reducing the delay in the cell switching process.

Second embodiment

6 is a flow chart of a control method according to a second embodiment. Based on the first embodiment of the present application, the control method further includes the following steps:

Optionally, the second downlink information includes at least one of MAC CE, DCI and a downlink signal.

Optionally, the terminal device reports to the network device the capability value of the terminal device to save the downlink synchronization information of the candidate cells, that is, the maximum number of candidate cells for which the terminal device can save the downlink synchronization information of the candidate cells, and/or the terminal device measures the downlink signals of the candidate cells, such as: synchronization broadcast block (Synchronization Signal and PBCH block, SS/PBCH block) or channel state information reference signal (Channel State Information Reference Signal, CSI-RS), and reports the measurement results (such as SSBRI/CRI and/or L1-RSRP) to the network device. The network device selects the candidate cells and indicates to the terminal device through MAC CE the candidate cells that need to perform downlink synchronization and obtain or get the downlink synchronization information.

Optionally, the network device selects a candidate cell based on the measurement results of the candidate cell (e.g., SSBRI/CRI and/or L1-RSRP), for example: selecting a candidate cell based on the size of the L1-RSRP of the candidate cell, and selecting a candidate cell with a larger L1-RSRP according to the ability value of the terminal device to save the downlink synchronization information of the candidate cell.

Optionally, the network device selects the target cell based on the measurement results of the candidate cells (eg, SSBRI/CRI and/or L1-RSRP), for example, the target cell is selected based on the size of the L1-RSRP of the candidate cells, and the candidate cell with the largest L1-RSRP is the target cell.

Optionally, the number of candidate cells indicated by the MAC CE does not exceed the number of candidate cells indicated by the capability value of the terminal device for storing downlink synchronization information of the candidate cells. The terminal device performs downlink synchronization on the candidate cells indicated in the MAC CE and obtains or acquires the downlink synchronization information corresponding to the candidate cells.

Referring to FIG. 7 , FIG. 7 is a first example schematic diagram of a control method according to the second embodiment. As shown in FIG. 7 , the candidate cell indication MAC CE can indicate a maximum of N candidate cells, where N is an integer. Optionally, if N is less than or equal to 8, the candidate cell indication MAC CE contains one eight-bit byte (i.e., octet); if N is greater than 8 and less than or equal to 16, the candidate cell indication MAC CE contains two eight-bit bytes, and so on. The Ci field is used to indicate whether the candidate cell i needs to perform downlink synchronization and obtain or get the corresponding downlink synchronization information. If the Ci field is set to 1, it indicates that the terminal device needs to perform downlink synchronization on the candidate cell i and obtain or get the downlink synchronization information corresponding to the candidate cell i, and/or, if the Ci field is set to 0, it indicates that it is not necessary to perform downlink synchronization on the candidate cell i and obtain or get the downlink synchronization information corresponding to the candidate cell i or clear the downlink synchronization information corresponding to the candidate cell i. R is a reserved bit, which is set to 0.

Optionally, an additional physical cell identifier may be defined in all candidate cells configured by the to-be-added and modified L1/L2 candidate list information element (e.g., Candidates-L1L2-ToAddModList-r18), indicating that the additional physical cell identifier parameter (e.g., additionalPCIIndex-r18) is uniformly numbered in all candidate cells configured by the to-be-added and modified L1/L2 candidate list information element, and all candidate cells configured by the to-be-added and modified L1/L2 candidate list information element refer to the to-be-added and modified L1/L2 candidate list information element configuration. The candidate cells configured by all L1/L2 candidate information elements to be added and modified (for example: Candidates-L1L2-ToAddMod-r18), that is, the candidate cells configured by the L1/L2 candidate cell configuration parameters (for example: candidates-L1L2-CellsConfig-r18) contained in all L1/L2 candidate information elements to be added and modified. Optionally, the type of the L1/L2 candidate cell configuration parameters is a cell group configuration information element (for example: CellGroupConfig). Optionally, the candidate cells include special cells and/or secondary cells.

Optionally, the configuration of additional physical cell identification parameters (e.g., additionalPCIIndex-r18) of the candidate cell includes adding additional physical cell identification parameters (e.g., additionalPCIIndex-r18) in the special cell configuration (e.g., SpCellConfig) information element, and/or adding additional physical cell identification parameters (e.g., additionalPCIIndex-r18) in the secondary cell configuration (e.g., SCellConfig) information element to indicate the additional physical cell identification of the candidate cell; it may also include adding additional physical cell identification parameters (e.g., additionalPCIIndex-r18) in the candidate cell measurement signal configuration information element to indicate the additional physical cell identification of the candidate cell.

Optionally, the Ci field in the candidate cell indication MAC CE is used to indicate whether the candidate cell i with the additional physical cell identifier i needs to perform downlink synchronization and obtain or get the corresponding downlink synchronization information. If the Ci field is set to 1, it means that the terminal device needs to perform downlink synchronization on the candidate cell i and obtain or get the corresponding downlink synchronization information, and/or, if the Ci field is set to 0, it means that it is not necessary to perform downlink synchronization on the candidate cell i and obtain or get the downlink synchronization information corresponding to the candidate cell i or clear the downlink synchronization information corresponding to the candidate cell i.

Optionally, the value of the additional physical cell identity parameter (eg, additionalPCIIndex-r18) included in the special cell configuration information element or the secondary cell configuration information element corresponding to the candidate cell i is i.

Optionally, the value of the additional physical cell identifier parameter (for example, additionalPCIIndex-r18) included in the candidate cell measurement signal configuration information element corresponding to the candidate cell i is i.

Optionally, an additional physical cell identifier may be defined in all candidate cells configured by the L1/L2 candidate information element to be added and modified, indicating that the additional physical cell identifier parameter (e.g., additionalPCIIndex-r18) is numbered in all candidate cells configured by the current L1/L2 candidate information element to be added and modified. All candidate cells configured by the L1/L2 candidate information element to be added and modified refer to all candidate cells configured by the L1/L2 candidate cell configuration parameters (e.g., candidates-L1L2-CellsConfig-r18) contained in the L1/L2 candidate information element to be added and modified. Optionally, the type of the L1/L2 candidate cell configuration parameters is a cell group configuration information element (e.g., CellGroupConfig). Optionally, the candidate cells include special cells and/or secondary cells.

Optionally, the configuration of additional physical cell identification parameters (e.g., additionalPCIIndex-r18) of the candidate cell includes adding additional physical cell identification parameters (e.g., additionalPCIIndex-r18) in the special cell configuration (e.g., SpCellConfig) information element, and/or adding additional physical cell identification parameters (e.g., additionalPCIIndex-r18) in the secondary cell configuration (e.g., SCellConfig) information element to indicate the additional physical cell identification of the candidate cell; and also includes adding additional physical cell identification parameters (e.g., additionalPCIIndex-r18) in the candidate cell measurement signal configuration information element to indicate the additional physical cell identification of the candidate cell.

Optionally, the candidate cell indication MAC CE may indicate candidate cells configured with up to M L1/L2 candidate information elements to be added and modified, optionally, the L1/L2 candidate list information element to be added and modified configures up to M L1/L2 candidate information elements to be added and modified and each L1/L2 candidate information element to be added and modified configures up to N candidate cells, optionally, M and N are integers.

Optionally, the Gi field in the candidate cell indication MAC CE is used to indicate whether the candidate cell configured by the L1/L2 candidate information element to be added and modified with the value i of the L1/L2 candidate index value parameter (for example: candidates-L1L2-Id-r18) needs to perform downlink synchronization and obtain or get the corresponding downlink synchronization information. If the Gi domain is set to 1, it means that at least one candidate cell among the candidate cells configured with the L1/L2 candidate information element to be added and modified and whose value is i of the L1/L2 candidate index value parameter (for example, candidates-L1L2-Id-r18) needs to perform downlink synchronization and obtain or get the corresponding downlink synchronization information, and/or, if the Gi domain is set to 0, it means that it is not necessary to perform downlink synchronization and obtain or get the corresponding downlink synchronization information for the candidate cell configured with the L1/L2 candidate index value parameter (for example, candidates-L1L2-Id-r18) and whose value is i of the L1/L2 candidate information element to be added and modified, or to clear the downlink synchronization information corresponding to the candidate cell configured with the L1/L2 candidate information element to be added and modified and whose value is i of the L1/L2 candidate index value parameter (for example, candidates-L1L2-Id-r18).

Optionally, the Cj field in the candidate cell indication MAC CE is used to indicate whether the candidate cell j with the additional physical cell identifier j needs to perform downlink synchronization and obtain or get the corresponding downlink synchronization information. If the Cj field is set to 1, it means that the terminal device needs to perform downlink synchronization on the candidate cell j and obtain or get the corresponding downlink synchronization information, and/or, if the Cj field is set to 0, it means that it is not necessary to perform downlink synchronization on the candidate cell j and obtain or get the downlink synchronization information corresponding to the candidate cell j or clear the downlink synchronization information corresponding to the candidate cell j.

Optionally, the value of the additional physical cell identity parameter (for example, additionalPCIIndex-r18) included in the special cell configuration information element or the secondary cell configuration information element corresponding to the candidate cell j is j.

Optionally, the value of the additional physical cell identifier parameter (for example, additionalPCIIndex-r18) included in the candidate cell measurement signal configuration information element corresponding to the candidate cell j is j.

Referring to FIG8 , FIG8 is a second example schematic diagram of a control method according to the second embodiment. As shown in FIG8 , for the design method of the candidate cell indication MAC CE, each Gi field in the candidate cell indication MAC CE corresponds to N Cj fields, and the Gi fields uniformly occupy the first octet of the candidate cell indication MAC CE. If M is greater than 8, the Gi field continues to occupy the second octet of the candidate cell indication MAC CE, and so on. If N is greater than 8, the N Cj fields corresponding to each Gi field continue to occupy the second octet of the candidate cell indication MAC CE, and so on. For example: the N Cj fields of the second octet correspond to the G1 field, and the N Cj fields of the third octet correspond to the G2 field.

Referring to FIG. 9 , FIG. 9 is a third example schematic diagram of the control method according to the second embodiment. As shown in FIG. 9 , each Gi field in the candidate cell indication MAC CE occupies the first position of each octet, and each Gi field and the corresponding N Cj fields occupy one octet of the candidate cell indication MAC CE. If (N+1) is greater than 8, each Gi field and the corresponding N Cj fields continue to occupy the second octet of the candidate cell indication MAC CE, and so on. For example: the N Cj fields of the first octet correspond to the G1 field, and the N Cj fields of the second octet correspond to the G2 field.

Optionally, if the Gi domain is set to 1 and the Cj domain corresponding to the Gi domain is set to 1, it means that in the candidate cell configured with the L1/L2 candidate information element to be added and modified and the value of the L1/L2 candidate index value parameter (e.g., candidates-L1L2-Id-r18) is i, the terminal device needs to perform downlink synchronization on the candidate cell j and obtain or get the corresponding downlink synchronization information; and/or, if the Cj domain is set to 0, that is, including the two cases that the Gi domain is set to 1 and the corresponding Cj domain is set to 0 and the Gi domain is set to 0 and the corresponding Cj domain is also set to 0, it means that it is not necessary to perform downlink synchronization on the candidate cell j and obtain or get the corresponding downlink synchronization information or clear the downlink synchronization information corresponding to the candidate cell j. R is a reserved bit and is set to 0.

Referring to Figure 10, Figure 10 is a fourth example schematic diagram of the control method shown in the second embodiment. As shown in Figure 10, there are M Gi fields in the candidate cell indication MAC CE, and the Gi fields uniformly occupy the first eight-bit byte of the candidate cell indication MAC CE. If M is greater than 8, the Gi field continues to occupy the second eight-bit byte of the candidate cell indication MAC CE, and so on. There are N Cj fields in the candidate cell indication MAC CE, and the Cj fields uniformly occupy the second eight-bit byte of the candidate cell indication MAC CE. If N is greater than 8, the Cj field continues to occupy the second eight-bit byte of the candidate cell indication MAC CE, and so on.

Optionally, if a Gi field is set to 1, the Cj field in the candidate cell indication MAC CE corresponds to the Gi field. If the Gi field is set to 1 and the Cj field is set to 1, it means that in the candidate cell configured with the L1/L2 candidate information element to be added and modified and the value of the L1/L2 candidate index value parameter (for example: candidates-L1L2-Id-r18) is i, the terminal device needs to perform downlink synchronization on the candidate cell j and obtain or get the corresponding downlink synchronization information; and/or, if the Cj field is set to 0, it means that it is not necessary to perform downlink synchronization on the candidate cell j and obtain or get the corresponding downlink synchronization information or clear the downlink synchronization information corresponding to the candidate cell j. Optionally, R is a reserved bit and can be set to 0.

Optionally, the terminal device can also measure the downlink signal of the candidate cell and report the measurement results to the network device so that the network device can select or determine the candidate cell, and indicate to the terminal device the candidate cell that needs to be downlink synchronized and obtain or get downlink synchronization information by adding a candidate cell identifier in the DCI. The terminal device performs downlink synchronization on the candidate cell indicated in the DCI and obtains or gets the downlink synchronization information corresponding to the candidate cell.

This embodiment adopts the above scheme, specifically by the terminal device reporting the ability value of the terminal device to save the downlink synchronization information of the candidate cell to the network device, so that the network device indicates the candidate cell for downlink synchronization through the media access control layer control unit, so that the terminal device can determine the candidate cell, and then perform downlink synchronization on the candidate cell and obtain or get the downlink synchronization information.

Third embodiment

Referring to Figure 11, Figure 11 is a flow chart of the control method shown according to the third embodiment. Based on any of the above embodiments of the present application, this embodiment discloses a specific method for indicating to a terminal device through DCI that a candidate cell needs to perform downlink synchronization and obtain or get downlink synchronization information.

Optionally, the terminal device measures the downlink signal of the candidate cell, such as the synchronization broadcast block (e.g., SS/PBCH block) or the channel state information reference signal (e.g., CSI-RS), and reports the measurement result (e.g., SSBRI/CRI and/or L1-RSRP) to the network device. The network device selects the candidate cell and indicates to the terminal device the candidate cell that needs to be downlink synchronized and obtain or get downlink synchronization information by adding the candidate cell identifier in the DCI (e.g., DCI format 1_0). The terminal device performs downlink synchronization on the candidate cell indicated in the downlink control information and obtains or gets the downlink synchronization information corresponding to the candidate cell. Optionally, the downlink control information is used for the random access process initiated by the PDCCH order. The terminal device obtains the physical downlink control channel command by the candidate cell identifier in the downlink control information to trigger it to perform physical random access channel (PRACH, Physical Random Access Channel) transmission to the candidate cell, thereby achieving uplink synchronization.

Optionally, an additional physical cell identifier may be defined in all candidate cells configured by the L1/L2 candidate list information element to be added and modified, indicating that the additional physical cell identifier parameter (for example: additionalPCIIndex-r18) is uniformly numbered in all candidate cells configured by the L1/L2 candidate list information element to be added and modified. All candidate cells configured by the L1/L2 candidate list information element to be added and modified refer to candidate cells configured by all L1/L2 candidate information elements to be added and modified configured by the L1/L2 candidate list information element to be added and modified, that is, candidate cells configured by L1/L2 candidate cell configuration parameters contained in all L1/L2 candidate information elements to be added and modified. Optionally, the type of the L1/L2 candidate cell configuration parameter is a cell group configuration information element. Optionally, the candidate cells include special cells and/or secondary cells.

Optionally, an additional physical cell identification field is added to the downlink control information (e.g., DCI format 1_0), or a reserved bit in the downlink control information (e.g., DCI format 1_0) is used as an additional physical cell identification field, and the terminal device selects or determines an additional physical cell identification of a candidate cell according to the value of the additional physical cell identification field, and performs downlink synchronization on the candidate cell and obtains or obtains the corresponding downlink synchronization information. Optionally, after saving or updating the downlink synchronization information, the terminal device performs physical random access channel transmission to the candidate cell according to the physical downlink control channel command indication information, thereby achieving uplink synchronization.

Optionally, an additional physical cell identifier field is added to the downlink control information (e.g., DCI format 1_0), or the reserved bits in the downlink control information (e.g., DCI format 1_0) are used as the additional physical cell identifier field, and the terminal device selects or determines an additional physical cell identifier of a candidate cell according to the value of the additional physical cell identifier field, and selects or determines a candidate cell from the candidate cells configured in the L1/L2 candidate list information element to be added and modified according to the additional physical cell identifier of the candidate cell.

Optionally, the terminal device selects or determines an additional physical cell identifier of a candidate cell based on the value of the additional physical cell identifier field in the downlink control information (for example: DCI format 1_0), selects or determines a candidate cell from the candidate cells configured in the L1/L2 candidate list information element to be added and modified based on the additional physical cell identifier of the candidate cell, performs downlink synchronization on the candidate cell and obtains or gets the corresponding downlink synchronization information.

Optionally, the value of the additional physical cell identifier field in the downlink control information (for example, DCI format 1_0) is equal to the value of the additional physical cell identifier parameter (for example, additionalPCIIndex-r18) contained in the special cell configuration information element or the secondary cell configuration information element corresponding to the candidate cell;

Optionally, the value of the additional physical cell identifier field in the downlink control information (eg, DCI format 1_0) is equal to the value of the additional physical cell identifier parameter (eg, additionalPCIIndex-r18) included in the candidate cell measurement signal configuration information element corresponding to the candidate cell.

Optionally, after saving or updating the downlink synchronization information, the terminal device performs physical random access channel transmission to the candidate cell according to the physical downlink control channel command indication information, thereby achieving uplink synchronization.

Optionally, a downlink synchronization determination field is added to the downlink control information (e.g., DCI format 1_0), or a reserved bit in the downlink control information (e.g., DCI format 1_0) is used as the downlink synchronization determination field. Optionally, the bit width of the downlink synchronization determination field obtained by these two methods is 1 bit, and the downlink synchronization determination field is used to indicate whether the terminal device performs downlink synchronization on the candidate cell and obtains or obtains the corresponding downlink synchronization information. If the value of this field is 1, it indicates that it is necessary to perform downlink synchronization on the candidate cell and obtain or obtain the corresponding downlink synchronization information, and/or, if the value of this field is 0, it indicates that it is not necessary to perform downlink synchronization on the candidate cell and obtain or obtain the corresponding downlink synchronization information.

Optionally, an additional physical cell identifier may be defined in all candidate cells configured by the L1/L2 candidate information element to be added and modified, indicating that the additional physical cell identifier parameter (for example, additionalPCIIndex-r18) is numbered in all candidate cells configured by the current L1/L2 candidate information element to be added and modified. All candidate cells configured by the L1/L2 candidate information element to be added and modified refer to all candidate cells configured by the L1/L2 candidate cell configuration parameters (for example, candidates-L1L2-CellsConfig-r18) contained in the L1/L2 candidate information element to be added and modified. Optionally, the type of the L1/L2 candidate cell configuration parameters is a cell group configuration information element. Optionally, the candidate cells include special cells and/or secondary cells.

Optionally, an L1/L2 candidate index value field is added to the downlink control information (e.g., DCI format 1_0), or the reserved bits in the downlink control information (e.g., DCI format 1_0) are used as the L1/L2 candidate index value field, and the terminal device selects or determines an L1/L2 candidate information element to be added and modified from the L1/L2 candidate list information element to be added and modified according to the value of the L1/L2 candidate index value field, that is, the value of the L1/L2 candidate index value field is the same as the value of the L1/L2 candidate index value parameter (e.g., candidates-L1L2-Id-r18) of the L1/L2 candidate information element to be added and modified.

Optionally, an additional physical cell identification field is added to the downlink control information (e.g., DCI format 1_0), or a reserved bit in the downlink control information (e.g., DCI format 1_0) is used as an additional physical cell identification field. The terminal device selects or determines an additional physical cell identification of a candidate cell according to the value of the additional physical cell identification field, and selects or determines a candidate cell from all candidate cells configured with the L1/L2 candidate information element to be added and modified corresponding to the value of the L1/L2 candidate index value field according to the additional physical cell identification of the candidate cell. For the configuration of the additional physical cell identification parameters of the candidate cell (e.g., additionalPCIIndex-r18):

Optionally, an additional physical cell identifier parameter (e.g., additionalPCIIndex-r18) is added to a special cell configuration (e.g., SpCellConfig) information element and/or an additional physical cell identifier parameter (e.g., additionalPCIIndex-r18) is added to a secondary cell configuration (e.g., SCellConfig) information element to indicate an additional physical cell identifier of the candidate cell;

Optionally, an additional physical cell identifier parameter (eg, additionalPCIIndex-r18) is added to the candidate cell measurement signal configuration information element to indicate an additional physical cell identifier of the candidate cell.

Optionally, the terminal device selects or determines the L1/L2 candidate information element to be added and modified according to the value of the L1/L2 candidate index value field, selects or determines the additional physical cell identifier of a candidate cell according to the value of the additional physical cell identifier field in the downlink control information (for example: DCI format 1_0), selects or determines a candidate cell from the candidate cells configured in the L1/L2 candidate information element to be added and modified according to the additional physical cell identifier of the candidate cell, performs downlink synchronization on the candidate cell and obtains or obtains the corresponding downlink synchronization information.

This embodiment uses the above scheme, specifically by measuring the downlink signal of the candidate cell through the terminal device, and reporting the measurement result to the network device, so that the network device indicates the candidate cell for downlink synchronization through downlink control information, so that the terminal device can determine the candidate cell, and then perform downlink synchronization on the candidate cell and obtain or get the downlink synchronization information.

Fourth embodiment

Referring to Figure 12, Figure 12 is a flow chart of a control method according to the fourth embodiment. Based on any of the above embodiments of the present application, this embodiment discloses a specific method for a terminal device to determine a candidate cell for acquiring or obtaining downlink synchronization information.

Optionally, the terminal device determines the measurement result of the candidate cell according to the downlink signal, and obtains or acquires the downlink synchronization information corresponding to the candidate cell whose measurement result meets the preset conditions.

Optionally, satisfying the preset condition includes: an offset value of a measurement result of the candidate cell is greater than or equal to a measurement result of the source cell, and/or the measurement result of the candidate cell is greater than or equal to a preset threshold value.

Optionally, the terminal device measures the downlink signal of the candidate cell, such as the synchronization broadcast block (e.g., SS/PBCH block) or the channel state information reference signal (e.g., CSI-RS), and reports the measurement results of the candidate cell that meets the preset conditions (e.g., SSBRI/CRI, L1-RSRP, L1-SINR) to the network device, and obtains or gets the downlink synchronization information of the candidate cell.

Optionally, the preset condition is met when the offset value of the measurement result of the candidate cell (e.g., L1-RSRP, L1-SINR) is better than the measurement result of the source cell, for example: (Measurement _{candidate cell i—} offset ≥ Measurement _{source cell} ), and optionally, the offset value may be an RRC configuration value or a default value. If the measurement result of the candidate cell i meets the preset condition, the terminal device reports the measurement result of the candidate cell i (e.g., SSBRI/CRI, L1-RSRP, L1-SINR), and obtains or obtains the downlink synchronization information of the candidate cell i.

Optionally, the preset condition is met when the measurement result of the candidate cell (e.g., L1-RSRP, L1-SINR) is higher than a preset threshold, for example: (Measurement _{candidate cell i} ≥ Threshold), and optionally, the preset threshold may be an RRC configuration or a default value. If the measurement result of the candidate cell i meets the preset condition, the terminal device reports the measurement result of the candidate cell i (e.g., SSBRI/CRI, L1-RSRP, L1-SINR), and obtains or obtains the downlink synchronization information of the candidate cell i.

Optionally, if the number of candidate cells that meet the preset conditions (e.g., M) is greater than the number of candidate cells indicated by the terminal device's ability to store downlink synchronization information of the candidate cells (e.g., N), the terminal device arranges the candidate cells of these preset conditions in a preset manner, and reports the measurement results of the first N candidate cells (e.g., SSBRI/CRI, L1-RSRP, L1-SINR) to the network device, and obtains or gets the downlink synchronization information of these N candidate cells. The preset manner may be to arrange the candidate cells according to the size of the L1 measurement results (e.g., L1-RSRP, L1-SINR).

This embodiment adopts the above-mentioned scheme, specifically, the terminal device determines the measurement result of the candidate cell according to the downlink signal, obtains or obtains the downlink synchronization information corresponding to the candidate cell whose measurement result meets the preset conditions, and provides a scheme for the terminal device to determine the candidate cell for obtaining or obtaining the downlink synchronization information, so that the terminal device can perform downlink synchronization based on the determined candidate cell and obtain or obtain the downlink synchronization information.

Fifth embodiment

Based on any of the above embodiments, this embodiment discloses a specific method for obtaining or acquiring downlink synchronization information based on the second downlink information in step S3. Referring to FIG. 13 , FIG. 13 is a flow chart of a control method according to the fifth embodiment, showing that the specific steps of step S3 include at least one of the following:

S31: Select or determine a candidate cell according to the medium access control layer control unit indicated by the candidate cell and/or the downlink control information, and acquire or obtain downlink synchronization information of the candidate cell;

Optionally, the terminal device determines a candidate cell to perform downlink synchronization on the candidate cell and acquire or obtain corresponding downlink synchronization information.

Optionally, if the Ci field in the candidate cell indication MAC CE is set to 1, it means that the candidate cell i needs to be synchronized downlink and acquired or Get the downlink synchronization information corresponding to the candidate cell i.

Optionally, the Gi field in the candidate cell indication MAC CE is set to 1 and the Cj field corresponding to the Gi field is set to 1, downlink synchronization is performed on the candidate cell j and the corresponding downlink synchronization information is acquired or obtained.

Optionally, the Gi field in the candidate cell indication MAC CE is set to 1 and the Cj field is set to 1, downlink synchronization is performed on the candidate cell j and the corresponding downlink synchronization information is acquired or obtained.

Optionally, a candidate cell is selected or determined according to the value of the L1/L2 candidate index value field and/or the additional physical cell identification field in the downlink control information, and downlink synchronization is performed on the candidate cell and corresponding downlink synchronization information is acquired or obtained.

S32: Determine the measurement result of the candidate cell according to the downlink signal, and obtain or acquire the downlink synchronization information corresponding to the candidate cell whose measurement result meets the preset condition.

Optionally, for a candidate cell whose measurement result meets a preset condition, the terminal device reports the measurement result of the candidate cell, and acquires or obtains downlink synchronization information of the candidate cell.

Optionally, acquiring or obtaining downlink synchronization information of the candidate cell includes: acquiring or obtaining the downlink synchronization information of the candidate cell according to a time unit of a reference cell based on a preset rule.

Optionally, the reference cell includes at least one of a source cell, a cell that is on the same frequency carrier as the candidate cell and has been detected, a special cell of a cell group corresponding to the candidate cell, and a reference cell configured by the network device.

Optionally, the preset rule includes at least one of the following:

Optionally, the downlink synchronization information of the candidate cell is acquired or obtained based on the time unit boundary of the reference cell and the timing relationship of the candidate cell, and the number of time units is used to indicate the downlink synchronization information of the candidate cell. The downlink synchronization information of the candidate cell includes at least one of the following fields: a candidate cell identification field, an advance-to-reference cell determination field, an intra-frequency candidate cell determination field, a subframe number field, a time slot number field, a symbol number field, and a sampling interval number field. The terminal device determines the frame boundary of the candidate cell based on the value of at least one of the above fields.

Optionally, the number of subframes included in the time difference between frames with the same number of the candidate cell and the reference cell is determined by the value of the subframe number field.

Optionally, the time difference between the frames with the same number of the candidate cell and the reference cell, in addition to the number of subframes indicated by the value of the subframe number field, includes a number of time slots determined by the value of the time slot number field.

Optionally, the number of time slots included in the time difference between frames with the same number of the candidate cell and the reference cell is determined by the value of the time slot number field.

Optionally, the time difference between the frames with the same number of the candidate cell and the reference cell, in addition to the number of subframes indicated by the value of the subframe number field and the number of time slots indicated by the value of the time slot number field, includes the number of symbols determined by the value of the symbol number field.

Optionally, the time difference between the frames with the same number of the candidate cell and the reference cell, in addition to the number of time slots indicated by the value of the time slot number field, includes a number of symbols determined by the value of the symbol number field.

Optionally, the number of symbols included in the time difference between frames with the same number of the candidate cell and the reference cell is determined by the value of the symbol number field.

Optionally, the number of sampling intervals included in the time difference between the frames with the same number of the candidate cell and the reference cell is M·K· _TC or M·K· _TS .

Optionally, the timing relationship of the candidate cell is determined by the timing relationship of the reference cell, and the time unit boundary of the candidate cell is aligned with the time unit boundary corresponding to the reference cell.

Optionally, the timing relationship of the candidate cell is determined by the timing relationship of the reference cell. Optionally, the time unit boundary of the candidate cell is aligned with the time unit boundary corresponding to the reference cell.

Optionally, the terminal device determines the synchronization broadcast block index value of the candidate cell based on the timing relationship of the reference cell, and the terminal device detects or receives the synchronization broadcast block, and determines the timing relationship of the candidate cell based on the detected or received synchronization broadcast block and the corresponding synchronization broadcast block index value.

Optionally, when the terminal device receives indication information from the network device, it selects or determines the candidate cell based on the indication information, and then determines the timing relationship of the candidate cell based on the downlink synchronization information of the candidate cell and the timing relationship of the reference cell, that is, determines the time unit (for example: frame, subframe, time slot) boundary of the candidate cell.

Optionally, the indication information may be a physical downlink control channel command and/or a cell switching command.

This embodiment adopts the above scheme, specifically by selecting or determining a candidate cell according to the candidate cell indication medium access control layer control unit and/or downlink control information, and acquiring or obtaining the downlink synchronization information of the candidate cell; determining the measurement result of the candidate cell according to the downlink signal, acquiring or obtaining the downlink synchronization information corresponding to the candidate cell whose measurement result meets the preset conditions, determining the candidate cell through at least one of the candidate cell indication medium access control layer control unit, downlink control information and downlink signal, and acquiring or obtaining the downlink synchronization information of the candidate cell, so that the terminal device can determine the candidate cell whose downlink synchronization information needs to be acquired or obtained before receiving the cell switching command, and perform the downlink synchronization operation based on the first downlink information, thereby reducing the waiting time after receiving the cell switching command, thereby reducing the delay in the cell switching process.

Sixth embodiment

Based on any of the above embodiments, this embodiment further discloses the control method in the above embodiments.

Optionally, the terminal device performs downlink synchronization on the candidate cell based on the synchronization broadcast block of the candidate cell. Optionally, the terminal device detects and/or receives the synchronization broadcast block of the candidate cell to determine the timing relationship of the candidate cell, that is, determines the boundary of the time unit (e.g., frame, subframe, time slot) of the candidate cell.

Optionally, the terminal device may acquire or obtain the downlink synchronization information of the candidate cell according to the time unit boundary of the reference cell and the timing relationship of the candidate cell.

Optionally, the reference cell may be selected or determined through intra-frequency candidate cells, or may be selected or determined through inter-frequency candidate cells.

Optionally, if the values of the absolute frequency domain (e.g., absoluteFrequencySSB) and subcarrier spacing domain (e.g., subcarrierSpacing) of the synchronous broadcast block in the common configuration information element of the serving cell (e.g., ServingCellConfigCommon) are equal to the synchronous broadcast block frequency and the synchronous broadcast block subcarrier spacing of the candidate cell, respectively, the source cell is considered to be on the same frequency carrier as the candidate cell, and the candidate cell is also referred to as a candidate cell within the frequency. Optionally, the reference cell is the source cell, that is, the current serving cell.

Optionally, if the value of the absolute frequency domain of the synchronization broadcast block (e.g., absoluteFrequencySSB) in the common configuration information element of the serving cell is not equal to the synchronization broadcast block frequency of the candidate cell, it is considered that the source cell and the candidate cell are not on the same frequency carrier, and the candidate cell is also called an inter-frequency candidate cell. Optionally, the reference cell is the source cell, that is, the current serving cell.

Optionally, the reference cell and the candidate cell are on the same frequency carrier and are detected cells, that is, cells that have completed synchronization.

Optionally, the reference cell is a special cell of the cell group corresponding to the candidate cell. Optionally, if the cell group corresponding to the candidate cell is a main cell group (e.g., MCG), the reference cell is a main cell (e.g., PCell); if the cell group corresponding to the candidate cell is a secondary cell group (e.g., SCG), the reference cell is a main secondary cell (e.g., PSCell).

Optionally, the reference cell is configured by a network device. Optionally, a reference cell index value field is added to the RRC, or the SSB index value field is obtained from the serving cell (for example, deriveSSB-IndexFromCellInter-r17) using the NR measurement object information element (for example, MeasObjectNR). The terminal device obtains the reference cell based on at least one of the above fields.

Optionally, the terminal device acquires or obtains the downlink synchronization information of the candidate cell including at least one of the following fields: candidate cell identification field, advance reference cell determination field, intra-frequency candidate cell determination field, subframe number field, time slot number field, symbol number field and sampling interval number field.

Optionally, the candidate cell identification field includes at least one of the following: a serving cell index value of a special cell (e.g., servCellIndex), a secondary cell index value of a secondary cell (e.g., sCellIndex), a physical cell identifier (e.g., PCI), a layer 1/layer 2 candidate index value, and an additional physical cell identifier.

Optionally, for the decision field ahead of the reference cell, the decision field ahead of the reference cell is 1 bit. If the decision field ahead of the reference cell takes a value of 1 or is enabled, it indicates that the candidate cell time unit (e.g., frame, subframe, time slot, symbol) is ahead of the time unit with the same number of the reference cell, for example, a frame of the candidate cell is ahead of the frame with the same number of the reference cell; and/or, if the decision field ahead of the reference cell takes a value of 0 or is not enabled, it indicates that the candidate cell time unit lags behind the time unit with the same number of the reference cell, for example, a frame of the candidate cell lags behind the frame with the same number of the reference cell.

Optionally, for the intra-frequency candidate cell determination domain, the intra-frequency candidate cell determination domain is 1 bit. If the value of the intra-frequency candidate cell determination domain is 1 or enabled, it indicates that the candidate cell is an intra-frequency candidate cell, and the candidate cell and the reference cell are on the same frequency carrier; and/or, if the value of the intra-frequency candidate cell determination domain is 0 or not enabled, it indicates that the candidate cell is an inter-frequency candidate cell, and the candidate cell and the reference cell are not on the same frequency carrier.

Optionally, for the subframe number field, the subframe number field is X bits, X is an integer, indicating the number of subframes (e.g., subframes) included in the time difference between the frames (e.g., frame) with the same number of the candidate cell and the reference cell, for example: the subframe number field has 2 bits, and the subframe number field value is 0/1/2/3, indicating that the number of subframes is 0/1/2/3 respectively. Optionally, the number of subframes included in the time difference between the frames with the same number of the candidate cell and the reference cell is determined by the value of the subframe number field, for example: if the value of the subframe number field is 1, it indicates that the number of subframes included in the time difference between the frames with the same number of the candidate cell and the reference cell is 1.

Optionally, for the time slot number field, the time slot number field is Y bits, where Y is an integer, representing the number of time slots (e.g., slots) included in the time difference between frames with the same number between the candidate cell and the reference cell. For example, the time slot number field has 2 bits, and the values of the time slot number field are 0/1/2/3, respectively indicating that the number of time slots is 0/1/2/3.

Optionally, the time difference between the frames with the same number of the candidate cell and the reference cell, in addition to the number of subframes indicated by the value of the subframe number field, includes a number of time slots determined by the value of the time slot number field. Referring to Figure 14, Figure 14 is a first example schematic diagram of a control method according to the seventh embodiment. As shown in Figure 14, if the value of the time slot number field is 1, it means that the time difference between the frames with the same number of the candidate cell and the reference cell, in addition to the number of subframes indicated by the value of the subframe number field, includes 1 time slot.

Optionally, the number of time slots included in the time difference between the frames with the same number of the candidate cell and the reference cell is determined by the value of the time slot number field. Referring to Figure 15, Figure 15 is a second example schematic diagram of a control method according to the seventh embodiment. As shown in Figure 15, if the value of the time slot number field is 1, it means that the number of time slots included in the time difference between the frames with the same number of the candidate cell and the reference cell is 1.

Optionally, for the symbol number field, the symbol number field is Z bits, where Z is an integer, indicating the number of symbols (e.g., symbol) contained in the time difference between the frames with the same number of the candidate cell and the reference cell. For example, the symbol number field has 2 bits, and the symbol number field value is 0/1/2/3, indicating that the number of symbols is 0/1/2/3, respectively. Optionally, the time difference between the frames with the same number of the candidate cell and the reference cell, in addition to the number of subframes indicated by the value of the subframe number field and the number of time slots indicated by the value of the time slot number field, contains the number of symbols determined by the value of the symbol number field. For details, please refer to Figure 14.

Optionally, the time difference between the frames with the same number between the candidate cell and the reference cell, in addition to the number of time slots indicated by the value of the time slot number field, includes the number of symbols determined by the value of the symbol number field. For example, if the value of the symbol number field is 1, it indicates that the time difference between the frames with the same number between the candidate cell and the reference cell, in addition to the number of time slots indicated by the value of the time slot number field, includes 1 symbol. Please refer to Figure 15 for details.

Optionally, the number of symbols included in the time difference between the frames with the same number of the candidate cell and the reference cell is determined by the value of the symbol number field. Referring to Figure 16, Figure 16 is a third example schematic diagram of a control method according to the seventh embodiment. As shown in Figure 16, if the value of the symbol number field is 1, it means that the number of symbols included in the time difference between the frames with the same number of the candidate cell and the reference cell is 1.

Optionally, for the sampling interval number field, the sampling interval number field is L bits, L is an integer, and is used to indicate the number of sampling intervals (e.g., Ts or Tc) included in the time difference between the frames with the same number of the candidate cell and the reference cell. Optionally, _Tc = 1/( _Δfmax · _Nf ), where _Δfmax = 480· ¹⁰³ Hz and _Nf = 4096; _Ts = 1/( _Δfref · _Nf.ref ), where _Δfref = 15· ¹⁰³ Hz and _Nf.ref = 2048. The number of sampling intervals included in the time difference between the frames with the same number of the candidate cell and the reference cell is M·K· _TC or M·K· _TS , where M is the value of the sampling interval number field, and K is the sampling interval. Sampling interval number factor. For the value M of the sampling interval number field, for example: the sampling interval number field has 2 bits, and the sampling interval number field value is 0/1/2/3, which respectively indicates that the value of M is 0/1/2/3. For the sampling interval number factor K, the value of the sampling interval number factor K can be determined by at least one of the following methods: the value of K is configured by the network device through RRC/MAC CE/DCI signaling, the value of K is a default value, the value of K is a default value and is related to the subcarrier spacing, and the value of K is a value determined according to the terminal device capability; optionally, the value of K is 1, indicating that the number of sampling intervals contained in the time difference between the frames with the same number of the candidate cell and the reference cell is M· _TC or M· _TS , that is, the sampling interval number is directly determined by the value of the sampling interval number field.

Referring to FIG17 , FIG17 is a schematic diagram of a fourth example of a control method according to the seventh embodiment. As shown in FIG17 , if the value of K is 16, the number of sampling intervals included in the time difference between the frames with the same number between the candidate cell and the reference cell is M· _16TC or M·16TS _. When the value of M is 2, it indicates that the number of sampling intervals included in the time difference between the frames with the same number between the candidate cell and the reference cell is _32TC or _32TS .

Optionally, the terminal device performs downlink synchronization on the candidate cell according to the received indication information, that is: the terminal device determines the timing relationship of the candidate cell according to the downlink synchronization information of the candidate cell and the timing relationship of the reference cell (for example: the boundary of the time unit (frame, subframe, time slot)), thereby performing downlink synchronization on the candidate cell. For example: the timing relationship of the candidate cell is obtained from the timing relationship of the reference cell (for example: the boundary of the time unit (frame, subframe, time slot)) according to the value of at least one of the following fields: candidate cell identification field, value of the decision field ahead of the reference cell, value of the decision field within the frequency candidate cell, subframe number field, time slot number field, symbol number field and sampling interval number field. For another example: as shown in Figure 16, the value of the decision field ahead of the reference cell is 0, the value of the decision field within the frequency candidate cell is 1, and the value of the symbol number field is 3, indicating that for frames with the same number, the candidate cell lags behind the reference cell by 3 symbols.

This embodiment adopts the above scheme, specifically by obtaining or getting the downlink synchronization information of the candidate cell according to the time unit boundary of the reference cell and the timing relationship of the candidate cell, so that the terminal device uses as little bit information as possible when obtaining or getting the downlink synchronization information of the candidate cell, thereby reducing the overhead of the terminal device; and/or using limited downlink synchronization information to perform more accurate downlink synchronization of the candidate cell.

Seventh embodiment

Optionally, the terminal device may also determine the downlink synchronization information of the candidate cell based on the synchronization broadcast block index value of the candidate cell.

Optionally, the timing relationship (e.g., frame, subframe, time slot) of the candidate cell is determined by the timing relationship of the reference cell. Optionally, the boundary of the time unit (e.g., frame, subframe, time slot) of the candidate cell is aligned with the boundary of the time unit corresponding to the reference cell, that is, the boundaries of the time units with the same number of the candidate cell and the reference cell are aligned.

Optionally, the terminal device determines the synchronization broadcast block index value of the candidate cell according to the timing relationship of the reference cell, the terminal device detects/receives the synchronization broadcast block, determines the timing relationship of the candidate cell according to the detected/received synchronization broadcast block and the corresponding synchronization broadcast block index value, that is, determines the time unit (e.g., frame, subframe, time slot) boundary of the candidate cell, and the terminal device maintains the downlink timing relationship of the candidate cell, that is, maintains the time unit (e.g., frame, subframe, time slot) boundary of the candidate cell. Optionally, a domain for obtaining the synchronization broadcast block index value from the serving cell is added to the RRC, or the SSB index value domain (e.g., deriveSSB-IndexFromCell) is used to obtain the SSB index value from the serving cell in the NR measurement object information element (e.g., MeasObjectNR). At least one of the above domains is used to indicate whether the terminal device determines the synchronization broadcast block index value of the candidate cell according to the timing relationship of the reference cell. Optionally, if the above domain is enabled, it indicates that the terminal device determines the synchronization broadcast block index value of the candidate cell according to the timing relationship of the reference cell.

Optionally, the terminal device determines the synchronization broadcast block index value of the candidate cell based on the timing relationship of the reference cell. The terminal device detects/receives the synchronization broadcast block, and determines the timing relationship of the candidate cell based on the detected/received synchronization broadcast block and the corresponding synchronization broadcast block index value, that is, determines the time unit (e.g., frame, subframe, time slot) boundary of the candidate cell. The number of time units included in the time difference between the frames with the same number between the candidate cell and the reference cell determined by the terminal device is determined by the value of at least one time unit number field, for example: the number of time slots included in the time difference between the frames with the same number between the candidate cell and the reference cell is determined by the value of the time slot number field, for another example: the number of symbols included in the time difference between the frames with the same number between the candidate cell and the reference cell is determined by the value of the symbol number field, for another example: the number of sampling intervals included in the time difference between the frames with the same number between the candidate cell and the reference cell is M·K· _TC or M·K· _TS , where M is the value of the sampling interval number field, K is the sampling interval number factor, and for the sampling interval number factor K, the value of the sampling interval number factor K can be determined by at least one of the following methods: the value of K is determined by the network device through RRC/MAC CE/DCI signaling configuration, the value of K is a default value, the value of K is a default value and is related to the subcarrier spacing, and the value of K is a value determined according to the terminal device capability; optionally, the value of K is 1, indicating that the number of sampling intervals contained in the time difference between the frames with the same number of the candidate cell and the reference cell is M· _TC or M· _TS , that is, the number of sampling intervals is directly determined by the value of the sampling interval number field. Optionally, the RRC adds a synchronized broadcast block index value field obtained from the serving cell, or the SSB index value field (for example: deriveSSB-IndexFromCell) is used to obtain the SSB index value from the serving cell in the NR measurement object information element (for example: MeasObjectNR). At least one of the above fields is used to indicate whether the terminal device determines the synchronized broadcast block index value of the candidate cell according to the timing relationship of the reference cell. Optionally, if the above field is enabled, it indicates that the terminal device determines the synchronized broadcast block index value of the candidate cell according to the timing relationship of the reference cell.

Optionally, the boundaries of the time units of the same number of the terminal device candidate cell and the reference cell are aligned, and the terminal device determines the time unit according to the reference cell. The terminal device detects/receives the synchronization broadcast block, and determines the timing relationship of the candidate cell according to the detected/received synchronization broadcast block and the corresponding synchronization broadcast block index value, that is, determines the time unit (e.g., frame, subframe, time slot) boundary of the candidate cell. The terminal device maintains the downlink timing relationship of the candidate cell, that is, maintains the time unit (e.g., frame, subframe, time slot) boundary of the candidate cell. Optionally, a new domain for obtaining the synchronization broadcast block index value from the serving cell is added in the RRC, or the SSB index value domain (e.g., deriveSSB-IndexFromCell) is used to obtain the SSB index value from the serving cell in the NR measurement object information element (e.g., MeasObjectNR). At least one of the above domains is used to indicate whether the terminal device determines the synchronization broadcast block index value of the candidate cell according to the timing relationship of the reference cell. Optionally, if the above domain is enabled, it indicates that the terminal device determines the synchronization broadcast block index value of the candidate cell according to the timing relationship of the reference cell.

Optionally, the boundaries of the time units with the same number of the terminal device candidate cell and the reference cell are aligned, the terminal device determines the synchronization broadcast block index value of the candidate cell based on the timing relationship of the reference cell, the terminal device detects/receives the synchronization broadcast block, and determines the timing relationship of the candidate cell based on the detected/received synchronization broadcast block and the corresponding synchronization broadcast block index value, that is, determining the boundaries of the time units (e.g., frames, subframes, time slots) of the candidate cell. The number of time units included in the time difference between the frames with the same number between the candidate cell and the reference cell determined by the terminal device is determined by the value of at least one time unit number field, for example: the number of time slots included in the time difference between the frames with the same number between the candidate cell and the reference cell is determined by the value of the time slot number field, for another example: the number of symbols included in the time difference between the frames with the same number between the candidate cell and the reference cell is determined by the value of the symbol number field, for another example: the number of sampling intervals included in the time difference between the frames with the same number between the candidate cell and the reference cell is M·K· _TC or M·K· _TS , where M is the value of the sampling interval number field, K is the sampling interval number factor, and for the sampling interval number factor K, the value of the sampling interval number factor K can be determined by at least one of the following methods: the value of K is determined by the network device through RRC/MAC CE/DCI signaling configuration, the value of K is a default value, the value of K is a default value and is related to the subcarrier spacing, and the value of K is a value determined according to the UE capability; optionally, the value of K is 1, indicating that the number of sampling intervals contained in the time difference between the frames with the same number of the candidate cell and the reference cell is M· _TC or M· _TS , that is: the number of sampling intervals is directly determined by the value of the sampling interval number field. Optionally, a new synchronized broadcast block index value field is added to the RRC to obtain the synchronized broadcast block index value from the serving cell, or the SSB index value field is obtained from the serving cell in the NR measurement object information element (for example: MeasObjectNR) (for example: deriveSSB-IndexFromCell), and at least one of the above fields is used to indicate whether the terminal device determines the synchronized broadcast block index value of the candidate cell according to the timing relationship of the reference cell. Optionally, if the above field is enabled, it indicates that the terminal device determines the synchronized broadcast block index value of the candidate cell according to the timing relationship of the reference cell.

This embodiment adopts the above scheme, specifically by determining the downlink synchronization information of the candidate cell according to the synchronization broadcast block index value of the candidate cell, so that the terminal device uses as little bit information as possible when acquiring or obtaining the downlink synchronization information of the candidate cell, thereby reducing the overhead of the terminal device; and/or using limited downlink synchronization information to perform more accurate downlink synchronization of the candidate cell.

Eighth embodiment

Optionally, since the downlink synchronization information of the candidate cell saved by the terminal device is time-sensitive, that is, after a preset time, when the downlink synchronization information is used to downlink synchronize the candidate cell, the downlink synchronization of the candidate cell may not be accurate enough, the terminal device can save, update or clear the downlink synchronization information of the candidate cell in a timely manner.

Optionally, the terminal device detects and/or receives the synchronization broadcast block of the candidate cell, and obtains or gets the downlink synchronization information of the candidate cell based on the synchronization broadcast block. If the terminal device detects and/or receives a new synchronization broadcast block, it clears the old downlink synchronization information of the candidate cell, obtains or gets the latest downlink synchronization information of the candidate cell based on the latest synchronization broadcast block, and the terminal device performs downlink synchronization on the candidate cell based on the latest downlink synchronization information.

Optionally, the network device configures a downlink synchronization information validity timer, which includes a duration for which the downlink synchronization information is valid. Each time the terminal device saves the downlink synchronization information of a candidate cell, it restarts the timer corresponding to the candidate cell. During the duration for which the downlink synchronization information is valid, the terminal device considers the saved downlink synchronization information to be valid. If the timer times out, that is, the time for saving the downlink synchronization information exceeds the duration for which the downlink synchronization information is valid, it indicates that the saved downlink synchronization information is invalid, and the terminal device cannot perform downlink synchronization on the candidate cell based on the saved downlink synchronization information. Optionally, if the timer times out, the terminal device clears the downlink synchronization information of the candidate cell, that is, the downlink synchronization information of the candidate cell is no longer saved, and the terminal device can no longer perform downlink synchronization on the candidate cell based on the saved downlink synchronization information.

Optionally, when the terminal device receives indication information from the network device or sends indication information to the network device, except for the candidate cell corresponding to the indication information, also called the target cell, the terminal device clears the downlink synchronization information of other candidate cells, that is, the downlink synchronization information of other candidate cells is no longer saved, and the terminal device can no longer perform downlink synchronization on other candidate cells based on the saved downlink synchronization information, wherein the indication information includes at least one of the following: a physical downlink control channel command (e.g., PDCCH order), a cell switching command (e.g., cell switch command), a cell switching confirmation message sent by the terminal device to the target cell, and a confirmation indication of the network device to the cell switching confirmation message sent by the terminal device to the target cell.

Optionally, under preset conditions, the terminal device clears the downlink synchronization information of the candidate cell, that is, the downlink synchronization information of the candidate cell is no longer saved, and the terminal device can no longer perform downlink synchronization on the candidate cell based on the saved downlink synchronization information. Optionally, the preset conditions include at least one of the following: the terminal device completes downlink synchronization of the target cell based on the saved downlink synchronization information, and the terminal device receives a confirmation indication from the network device on the cell switching confirmation message sent to the target cell.

Ninth embodiment

Referring to FIG. 18 , FIG. 18 is a flow chart of a control method according to a ninth embodiment. The control method can be applied to a network device (eg, a base station), and includes the following steps:

Optionally, the network device sends the first downlink information to the terminal device, so that the terminal device performs downlink synchronization on the candidate cell based on the first downlink information and/or the downlink synchronization information.

Optionally, the method further comprises:

Optionally, the network device sends the second downlink information to the terminal device, so that the terminal device acquires or obtains the downlink synchronization information based on the second downlink information, and then performs downlink synchronization on the candidate cell in combination with the first downlink information.

Optionally, the method comprises at least one of the following:

Optionally, the first downlink information includes PDCCH order and/or cell switching command.

The terminal device selects or determines a candidate cell according to the candidate cell indication medium access control layer control unit and/or downlink control information, and acquires or obtains downlink synchronization information of the candidate cell;

Optionally, the network device may select or determine a candidate cell based on the measurement results reported by the terminal device, and indicate to the terminal device through MAC CE the candidate cells that require downlink synchronization and acquire or obtain downlink synchronization information. The terminal device performs downlink synchronization on the candidate cells indicated in MAC CE and acquires or obtains the downlink synchronization information corresponding to the candidate cells.

Optionally, the network device may select or determine a candidate cell according to a measurement result reported by the terminal device, where the measurement result is obtained by the terminal device measuring a downlink signal of the candidate cell.

Optionally, the network device indicates to the terminal device the candidate cell that needs to perform downlink synchronization and obtain or get downlink synchronization information by adding a candidate cell identifier in the DCI. The terminal device performs downlink synchronization on the candidate cell indicated in the DCI and obtains or gets the downlink synchronization information corresponding to the candidate cell.

Optionally, the terminal device acquires or obtains downlink synchronization information corresponding to a candidate cell whose measurement results meet preset conditions. Optionally, the preset conditions include that the offset value of the measurement result of the candidate cell is greater than or equal to the measurement result of the source cell, and/or that the measurement result of the candidate cell is greater than or equal to a preset threshold value.

Optionally, the preset rule includes at least one of the following:

Optionally, if the terminal device completes downlink synchronization of the target cell according to the saved downlink synchronization information, and/or the terminal device receives a confirmation indication from the network device on the cell switching confirmation message sent to the target cell, the terminal device can clear the downlink synchronization information of the corresponding candidate cell.

This embodiment uses the above scheme, specifically by sending the first downlink information, so that the terminal device performs downlink synchronization on the candidate cell based on the first downlink information and/or downlink synchronization information, so that the terminal device can determine the candidate cell that needs to obtain or get the downlink synchronization information before receiving the cell switching command, and perform the downlink synchronization operation based on the first downlink information, thereby reducing the waiting time after receiving the cell switching command, thereby reducing Low latency during cell switching.

Tenth embodiment

Refer to Figure 19, which is a schematic diagram of the first interaction sequence according to the tenth embodiment. Based on any of the above embodiments, this embodiment further discloses the control method in the above embodiments.

In an embodiment of the present application, a network device (eg, a base station) sends first downlink information and/or second downlink information to a terminal device (eg, a mobile phone).

Optionally, the network device sends the second downlink information to the terminal device, so that the terminal device acquires or obtains the downlink synchronization information based on the second downlink information.

Optionally, the network device sends first downlink information to the terminal device, so that the terminal device performs downlink synchronization on the candidate cell based on the first downlink information and/or downlink synchronization information.

Optionally, when the terminal device receives the indication information from the network device, it selects or determines the candidate cell according to the indication information, and then determines the timing relationship of the candidate cell according to the downlink synchronization information of the candidate cell and the timing relationship of the reference cell (e.g., frame, subframe, time slot), that is, determines the time unit (e.g., frame, subframe, time slot) boundary of the candidate cell, wherein the indication information includes at least one of the following: physical downlink control channel command (e.g., PDCCH order), cell switching command (e.g., cell switch command). When the terminal device receives the indication information, it completes downlink synchronization of the candidate cell (also called the target cell). As shown in Figure 19, when the terminal device receives the physical downlink control channel command, it performs downlink synchronization on the candidate cell according to the downlink synchronization information of the candidate cell.

Referring to FIG. 20 , FIG. 20 is a schematic diagram of a second interaction sequence according to the tenth embodiment. As shown in FIG. 20 , when the terminal device receives a cell switching command, it performs downlink synchronization on the candidate cell according to the downlink synchronization information of the candidate cell.

This embodiment uses the above scheme, specifically, by sending the first downlink information and/or the second downlink information to the terminal device through the network device, so that the terminal device performs downlink synchronization on the candidate cell based on the first downlink information and/or the downlink synchronization information, and/or, the terminal device obtains or obtains the downlink synchronization information based on the second downlink information, so that the terminal device can determine the candidate cell that needs to obtain or obtain the downlink synchronization information before receiving the cell switching command, and perform the downlink synchronization operation based on the first downlink information, thereby reducing the waiting time after receiving the cell switching command, thereby reducing the delay in the cell switching process.

Please refer to Figure 21, which is a schematic diagram of the structure of the control device provided in the embodiment of the present application. The device can be mounted on or is the terminal device in the above method embodiment. The device can be used to perform some or all of the functions in the method embodiment described in the above embodiment. As shown in Figure 21, the control device 110 includes:

The control module 111 is configured to perform downlink synchronization on the candidate cell based on the first downlink information and/or the downlink synchronization information.

Optionally, the device further comprises:

The downlink synchronization information is acquired or obtained based on the second downlink information.

Optionally, acquiring or obtaining downlink synchronization information based on the second downlink information includes at least one of the following:

Optionally, the device comprises at least one of the following:

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

Save, update or clear downlink synchronization information;

The control device provided in the embodiment of the present application can execute the technical solution shown in the above method embodiment, and its implementation principle and beneficial effects are similar, which will not be repeated here.

Please refer to Figure 22, which is a second schematic diagram of the structure of the control device provided in the embodiment of the present application. The device can be mounted on or is the network device in the above method embodiment. The device can be used to perform some or all of the functions in the method embodiment described in the above embodiment. As shown in Figure 22, the control device 120 includes:

The sending module 121 is used to send the first downlink information so that the terminal device performs downlink synchronization on the candidate cell based on the first downlink information and/or downlink synchronization information.

Optionally, the device further comprises:

The second downlink information is sent so that the terminal device acquires or obtains the downlink synchronization information based on the second downlink information.

Optionally, the device comprises at least one of the following:

Refer to Figure 23, which is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. As shown in Figure 23, the communication device 140 described in this embodiment can be a terminal device (or a component that can be used for a terminal device) or a network device (or a component that can be used for a network device) mentioned in the aforementioned method embodiment. The communication device 140 can be used to implement the method corresponding to the terminal device or the network device described in the aforementioned method embodiment, and specifically refer to the description in the aforementioned method embodiment.

The communication device 140 may include one or more processors 141, which may also be referred to as a processing unit, and may implement certain control or processing functions. The processor 141 may be a general-purpose processor or a dedicated processor, etc. For example, it may be a baseband processor or a central processing unit. The baseband processor may be used to process the communication protocol and communication data, and the central processing unit may be used to control the communication device, execute the software program, and process the data of the software program.

Optionally, the processor 141 may also store instructions 143 or data (eg, intermediate data). Optionally, the instructions 143 may be executed by the processor 141, so that the communication device 140 executes the method corresponding to the terminal device or network device described in the above method embodiment.

Optionally, the communication device 140 may include a circuit, which can implement the functions of sending or receiving or communicating in the aforementioned method embodiments.

Optionally, the communication device 140 may include one or more memories 142, on which instructions 144 may be stored. The instructions may be executed on the processor 141, so that the communication device 140 executes the method described in the above method embodiment.

Optionally, data may also be stored in the memory 142. The processor 141 and the memory 142 may be provided separately or integrated together.

Optionally, the communication device 140 may further include a transceiver 145 and/or an antenna 146. The processor 141 may be referred to as a processing unit, and controls the communication device 140 (terminal device or core network device or wireless access network device). The transceiver 145 may be referred to as a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., and is used to implement the transceiver function of the communication device 140.

Optionally, if the communication device 140 is used to implement operations corresponding to the terminal device in the above-mentioned embodiments, for example, the transceiver 145 can receive the first downlink information and/or the second downlink information; and the processor 141 can perform downlink synchronization on the candidate cell based on the first downlink information and/or the downlink synchronization information.

Optionally, the specific implementation process of the processor 141 and the transceiver 145 can refer to the relevant description of the above embodiments, which will not be repeated here.

Optionally, if the communication device 140 is used to implement operations corresponding to the network devices in the above-mentioned embodiments, for example: the transceiver 145 can send the first downlink information and/or the second downlink information so that the terminal device performs downlink synchronization on the candidate cell based on the first downlink information and/or the downlink synchronization information.

The processor 141 and the transceiver 145 described in the present application can be implemented in an IC (Integrated Circuit), an analog integrated circuit, an RFIC (Radio Frequency Integrated Circuit), a mixed signal integrated circuit, an ASIC (Application Specific Integrated Circuit), a PCB (Printed Circuit Board), an electronic device, etc. The processor 141 and the transceiver 145 can also be manufactured using various integrated circuit process technologies, such as CMOS (Complementary Metal Oxide Semiconductor), NMOS (N Metal-Oxide-Semiconductor), PMOS (Positive channel Metal Oxide Semiconductor), BJT (Bipolar Junction Transistor), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

In this application, the communication device may be a terminal device (such as a mobile phone) or a network device (such as a base station), which needs to be determined according to the context. In addition, the terminal device may be implemented in various forms. For example, the terminal device described in this application may include mobile terminals such as mobile phones, tablet computers, laptop computers, PDAs, portable media players (PMPs), navigation devices, wearable devices, smart bracelets, pedometers, etc., as well as fixed terminal devices such as digital TVs and desktop computers.

Although in the above embodiment description, the communication device is described by taking a terminal device or a network device as an example, the scope of the communication device described in the present application is not limited to the above terminal device or network device, and the structure of the communication device may not be limited by Figure 23. The communication device may be an independent device or may be part of a larger device.

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

The embodiment of the present application also provides a communication device, including a memory and a processor, wherein a control program is stored in the memory, and when the control program is executed by the processor, the steps of the control method in any of the above embodiments are implemented. The communication device in the present application can be a terminal device (such as a mobile phone) or a network device (such as a base station), and the specific reference needs to be clarified according to the context.

An embodiment of the present application further provides a storage medium having a control program stored thereon. When the control program is executed by a processor, the steps of the control method in any of the above embodiments are implemented.

In the embodiments of the communication device and the storage medium provided in the embodiments of the present application, all the technical features of any of the above-mentioned control method embodiments may be included, and the expansion and explanation content of the specification are basically the same as those of the embodiments of the above-mentioned methods, and will not be repeated here.

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

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

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

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

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

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

In the present application, the same or similar terminology concepts, technical solutions and/or application scenario descriptions are generally described in detail only the first time they appear. When they appear again later, they are generally not repeated for the sake of brevity. When understanding the technical solutions and other contents of the present application, for the same or similar terminology concepts, technical solutions and/or application scenario descriptions that are not described in detail later, reference can be made to the previous related detailed descriptions.

In the present application, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

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

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

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

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 present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

A control method, comprising the steps of:

S4: Perform downlink synchronization on the candidate cell based on the first downlink information and/or the downlink synchronization information.
The method according to claim 1, wherein the method further comprises:

S3: Acquire or obtain downlink synchronization information based on the second downlink information.
The method according to claim 2, wherein step S3 comprises at least one of the following:

Select or determine a candidate cell according to the candidate cell indication medium access control layer control unit and/or downlink control information, and acquire or obtain downlink synchronization information of the candidate cell;

The measurement result of the candidate cell is determined according to the downlink signal, and the downlink synchronization information corresponding to the candidate cell whose measurement result meets the preset condition is acquired or obtained.
The method according to claim 3, comprising at least one of the following:

The satisfying of the preset condition includes: an offset value of the measurement result of the candidate cell is greater than or equal to the measurement result of the source cell, and/or the measurement result of the candidate cell is greater than or equal to a preset threshold value;

The acquiring or obtaining the downlink synchronization information of the candidate cell includes: acquiring or obtaining the downlink synchronization information of the candidate cell according to a time unit of a reference cell based on a preset rule.
The method according to claim 4, further comprising at least one of the following:

The reference cell includes at least one of the following: a source cell, a cell that is on the same frequency carrier as the candidate cell and has been detected, a special cell of a cell group corresponding to the candidate cell, and a reference cell configured by a network device;

The preset rules include at least one of the following: the number of time slots included in the time difference between frames with the same number between the candidate cell and the reference cell is determined by the value of the time slot number field, the number of symbols included in the time difference between frames with the same number between the candidate cell and the reference cell is determined by the value of the symbol number field, and the number of sampling intervals included in the time difference between frames with the same number between the candidate cell and the reference cell is determined by the value of the sampling interval number field and/or the sampling interval number factor.
The method according to claim 1, further comprising at least one of the following:

The first downlink information includes a physical downlink control channel command and/or a cell switching command;

The downlink synchronization information includes at least one of a candidate cell identification field, an advance-to-reference cell determination field, an intra-frequency candidate cell determination field, a subframe number field, a time slot number field, a symbol number field, and a sampling interval number field;

Save, update or clear downlink synchronization information;

The second downlink information includes at least one of a candidate cell indication medium access control layer control unit, downlink control information and a downlink signal.
The method according to claim 6, wherein saving, updating or clearing downlink synchronization information of the candidate cell comprises at least one of the following:

In response to detecting or receiving a new synchronization broadcast block, saving or updating downlink synchronization information of the candidate cell, and/or restarting a downlink synchronization information validity timer corresponding to the candidate cell;

In response to the downlink synchronization information validity timer corresponding to the candidate cell expiring, clearing the downlink synchronization information of the candidate cell;

In response to sending or receiving the indication information, clearing downlink synchronization information of candidate cells other than the candidate cell corresponding to the indication information;

In response to completing downlink synchronization and/or receiving a confirmation indication, clearing downlink synchronization information of the corresponding candidate cell.
A control method, comprising the steps of:

S2: Send the first downlink information so that the terminal device performs downlink synchronization on the candidate cell based on the first downlink information and/or downlink synchronization information.
The method according to claim 8, wherein the method further comprises:

S1: Send the second downlink information so that the terminal device acquires or obtains the downlink synchronization information based on the second downlink information.
The method of claim 9, comprising at least one of the following:

The first downlink information includes a physical downlink control channel command and/or a cell switching command;

The downlink synchronization information includes at least one of a candidate cell identification field, an advance reference cell determination field, an intra-frequency candidate cell determination field, a subframe number field, a time slot number field, a symbol number field, and a sampling interval number field;

The second downlink information includes at least one of a candidate cell indication medium access control layer control unit, downlink control information and a downlink signal.
The method according to claim 9, wherein the step of the terminal device acquiring or obtaining the downlink synchronization information based on the second downlink information comprises at least one of the following:

The terminal device selects or determines a candidate cell according to the candidate cell indication medium access control layer control unit and/or downlink control information, and acquires or obtains downlink synchronization information of the candidate cell;

The terminal device determines the measurement result of the candidate cell according to the downlink signal, and obtains or acquires the downlink synchronization information corresponding to the candidate cell whose measurement result meets the preset conditions.
A communication device, comprising: a memory, a processor, and a control program stored in the memory and executable on the processor, wherein the control program implements the steps of the control method as claimed in claim 1 or 8 when executed by the processor.
A 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 control method according to claim 1 or 8 are implemented.