Synchronization method and device, network equipment, terminal, storage medium and program product

Abstract

The invention provides a synchronization method and device, network equipment, a terminal, a storage medium and a program product, and relates to the technical field of communication, the method comprises the following steps: sending a first main information block MIB to the terminal, the first MIB carrying scheduling information of a first system information block SIB1; sIB1 is sent to a terminal, the SIB1 carries first indication information, and the first indication information is used for indicating whether secondary synchronization exists or not; and under the condition that the first indication information indicates the secondary synchronization, sending a non-cell definition synchronization signal block (NCD-SSB) to the terminal, the NCD-SSB being used for the terminal to perform the secondary synchronization. Thus, the terminal can be synchronized with the cell corresponding to the best SSB found by measurement in a PCI confusion scene, the subsequent terminal can be successfully accessed to the cell, and the problem of terminal access failure caused by PCI confusion is solved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a synchronization method, apparatus, network equipment, terminal, storage medium and program product. Background Art

[0002] The existing random access process is: the terminal in the idle state searches for the Master Information Block (MIB) message of all cells and initiates residence. After searching the MIB, the terminal obtains the synchronization signal block (SSB) index information, and then initiates random access on the contention resource of the PRACH corresponding to the SSB according to the physical random-access channel (PRACH) resource corresponding to the subsequently received system information block (SIB). After receiving the PRACH, the base station confirms the beam direction of the terminal according to the time-frequency domain position of the PRACH resource and sends downlink data.

[0003] However, in low-altitude coverage, since low-altitude coverage is in a line of sight (LOS) environment, signal transmission cross-interference is serious, the cell coverage radius is far, and the coverage range is large. In addition, because of the same frequency coverage of air and ground, that is, there are a large number of ground cells within the area of ​​a cell covered in the air, the probability of confusion of the physical cell identifier (PCI) is doubled. This will cause the terminal to measure the MIB of cell A and the SIB of cell B, resulting in the failure of terminal access and residence; among them, the PCI of cell A is the same as the PCI of cell B.

[0004] For example, a cell broadcasts 5 SSBs, and the terminal finds that SSB 2 is the best through measurement. For the terminal, the downlink beam pair has been formed at this time (the base station sends beam SSB2, and the terminal receives beam), but the base station does not know this information yet; the terminal receives the best SSB2 beam direction, and in turn sends PRACH in this direction, and selects PRACH or preamble resources according to the association between PRACH and SSB index. In this way, the base station receives PRACH preamble and deduces that downlink SSB 2 is the best downlink beam for this terminal based on the mapping relationship, and then performs downlink transmission to the terminal on this SSB; however, the terminal reports SSB2 of cell A, and receives SSB2 information of cell B, which makes the terminal unable to receive downlink data in the SSB2 direction of cell B. Summary of the invention

[0005] The embodiments of the present application provide a synchronization method, apparatus, network device, terminal, storage medium and program product, which solve the problem of terminal access failure due to PCI confusion.

[0006] In a first aspect, to achieve the above-mentioned object, an embodiment of the present application provides a synchronization method, which is applied to a first cell, including: Sending a first master information block MIB to the terminal, where the first MIB carries scheduling information of a first system information block SIB1; Sending SIB1 to the terminal, where the SIB1 carries first indication information, where the first indication information is used to indicate whether secondary synchronization is performed; In the case where the first indication information indicates secondary synchronization, a non-cell defined synchronization signal block NCD-SSB is sent to the terminal, and the NCD-SSB is used for the terminal to perform secondary synchronization.

[0007] Wherein, the SIB1 also carries the resource location information of the NCD-SSB; The sending of a non-defined cell synchronization signal block NCD-SSB to the terminal includes: The NCD-SSB is sent to the terminal on the resource corresponding to the resource location information of the NCD-SSB.

[0008] The sending of the first master information block MIB to the terminal includes: A cell definition synchronization signal block CD-SSB is sent to the terminal, wherein the CD-SSB carries the first MIB, and the CD-SSB is used for the terminal to perform a synchronization.

[0009] Among them, the beam pattern of the NCD-SSB is the same as the beam pattern of the CD-SSB, and the physical random access channel PRACH resource positions corresponding to the beams of the same pattern are the same.

[0010] Wherein, the method further comprises: Based on the physical cell identifier PCI of the first cell, the resource location occupied by the NCD-SSB is determined, wherein the resource locations occupied by the NCD-SSB of different cells are different.

[0011] Wherein, determining the resource location occupied by the NCD-SSB based on the physical cell identifier PCI of the first cell includes at least one of the following: Determine the frequency domain position occupied by the NCD-SSB according to the first remainder and the second remainder of N; wherein the first remainder is the remainder of the network device ID and the PCI of the first cell, and the area covered by the network device corresponding to the network device ID includes the first cell; N is related to the ratio of the total bandwidth to the number of physical resource blocks PRB in the NCD-SSB; Determine the initial time domain position occupied by the NCD-SSB according to the sum of the network device identification ID and the first random number; wherein the first random number is a random number between 1 and M; M is the ratio of the NCD-SSB period to the system subframe length; Determine the frequency domain position occupied by the NCD-SSB according to the sum of the PCI of the first cell and a second random number; wherein the second random number is a random number between 1 and N; Determine, according to the remainder of the PCI of the first cell and M, an initial time domain position occupied by the NCD-SSB; Determine, according to the remainder of the PCI of the first cell and N, a frequency domain position occupied by the NCD-SSB; The initial time domain position occupied by the NCD-SSB is determined according to the sum of the PCI of the first cell and the first random number.

[0012] In a second aspect, to achieve the above-mentioned purpose, an embodiment of the present application provides a synchronization method, applied to a terminal, comprising: receiving a first MIB sent by a network device, where the first MIB carries scheduling information of SIB1, and a coverage area of ​​the network device includes a first cell; Determine, according to the first MIB, that the target cell is the first cell; receiving, according to a first MIB corresponding to the first cell, SIB1 sent by the first cell, where the SIB1 carries first indication information, and the first indication information is used to indicate whether secondary synchronization is performed; When the first indication information indicates secondary synchronization, receiving NCD-SSB according to the SIB1; According to the second MIB in the NCD-SSB, a secondary synchronization is performed.

[0013] Wherein, according to the SIB1, receiving the NCD-SSB includes: The NCD-SSB is received on the resources corresponding to the resource location information of the NCD-SSB carried by the SIB1.

[0014] Wherein, the method further comprises: Randomly access the first cell according to the SIB1 and the second MIB.

[0015] The receiving of the first MIB sent by the network device includes: Receive a CD-SSB sent by a network device, wherein the CD-SSB carries the first MIB, and the CD-SSB is used for the terminal to perform a synchronization.

[0016] Among them, the beam pattern of the NCD-SSB in the same cell is the same as the beam pattern of the CD-SSB, and the PRACH resource positions corresponding to the beams of the same pattern are the same.

[0017] The resource location occupied by the NCD-SSB is related to the PCI of the first cell, and the resource locations occupied by the NCD-SSB of different cells are different.

[0018] The method for determining the resource location occupied by the NCD-SSB includes at least one of the following: The frequency domain position is determined based on the first remainder and the second remainder of N; wherein the first remainder is the remainder of the network equipment identification ID and the PCI of the first cell; N is related to the ratio of the total bandwidth to the number of physical resource blocks PRB in the NCD-SSB; The time domain initial position is determined based on the sum of the network device ID and the first random number; wherein the first remainder is the remainder of the network device ID and the PCI of the first cell; wherein the first random number is a random number between 1 and M; M is the ratio of the period of NCD-SSB to the system subframe length; The frequency domain position is determined based on the sum of the PCI of the first cell and a second random number; wherein the second random number is a random number between 1 and N; The time domain initial position is based on the remainder of the PCI of the first cell and M; The frequency domain position is determined based on the remainder of the PCI of the first cell and N; The time domain initial position is determined based on the sum of the PCI of the first cell and the first random number.

[0019] In a third aspect, in order to achieve the above-mentioned purpose, an embodiment of the present application provides a synchronization device, which is applied to a network device, including: A first sending module, configured to send a first master information block MIB to a terminal, where the first MIB carries scheduling information of a first system information block SIB1; A second sending module, configured to send SIB1 to the terminal, where the SIB1 carries first indication information, and the first indication information is used to indicate whether secondary synchronization is performed; The third sending module is used to send a non-cell defined synchronization signal block NCD-SSB to the terminal when the first indication information indicates secondary synchronization, and the NCD-SSB is used for the terminal to perform secondary synchronization.

[0020] In a fourth aspect, in order to achieve the above-mentioned purpose, an embodiment of the present application provides a synchronization device, applied to a terminal, including: A first receiving module, configured to receive a first MIB sent by a network device, wherein the first MIB carries scheduling information of SIB1, and a coverage area of ​​the network device includes a first cell; a determination module, configured to determine, according to the first MIB, that the target cell is the first cell; A second receiving module, configured to receive, according to a first MIB corresponding to the first cell, SIB1 sent by the first cell, where the SIB1 carries first indication information, and the first indication information is used to indicate whether secondary synchronization is performed; A third receiving module is configured to receive NCD-SSB according to the SIB1 when the first indication information indicates secondary synchronization; A synchronization module is used to perform secondary synchronization according to the second MIB in the NCD-SSB.

[0021] In the fifth aspect, in order to achieve the above-mentioned purpose, an embodiment of the present application provides a network device, including a transceiver, a processor, a memory, and a program stored in the memory and executable on the processor; when the processor executes the program, it implements the synchronization method described in the first aspect.

[0022] In the sixth aspect, in order to achieve the above-mentioned purpose, an embodiment of the present application provides a terminal, including a transceiver, a processor, a memory, and a program stored in the memory and executable on the processor; when the processor executes the program, it implements the synchronization method described in the second aspect.

[0023] In the seventh aspect, in order to achieve the above-mentioned purpose, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the synchronization method as described in the first aspect is implemented, or the synchronization method as described in the second aspect is implemented.

[0024] In the eighth aspect, in order to achieve the above-mentioned purpose, an embodiment of the present application provides a computer program product, including computer instructions, which, when executed by a processor, implement the synchronization method as described in the first aspect, or implement the synchronization method as described in the second aspect.

[0025] The beneficial effects of the above technical solution of the present application are as follows: In the embodiment of the present application, first, a first master information block MIB is sent to the terminal, and the first MIB carries the scheduling information of the first system information block SIB1; secondly, SIB1 is sent to the terminal, and the SIB1 carries the first indication information, and the first indication information is used to indicate whether secondary synchronization is performed; thirdly, when the first indication information indicates secondary synchronization, a non-cell-defined synchronization signal block NCD-SSB is sent to the terminal, and the NCD-SSB is used for the terminal to perform secondary synchronization. In this way, through the secondary synchronization, in the scenario of PCI confusion, the terminal can be synchronized with the cell corresponding to the best SSB found by the measurement, so that subsequent terminals can successfully access the cell and solve the problem of terminal access failure due to PCI confusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is one of the flowcharts of the synchronization method according to an embodiment of the present application; Figure 2 This is a second flowchart of the synchronization method according to an embodiment of the present application; Figure 3 This is a third flowchart of the synchronization method according to an embodiment of the present application; Figure 4 This is one of the structural schematic diagrams of the synchronization device according to an embodiment of the present application; Figure 5 This is a second structural diagram of the synchronization device according to an embodiment of the present application; Figure 6 A schematic diagram of the structure of a network device according to an embodiment of the present application; Figure 7 A schematic diagram of the structure of a terminal according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and advantages to be solved by the present application clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0028] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0029] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the following processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0030] Additionally, the terms "system" and "network" are often used interchangeably herein.

[0031] In the embodiments provided in this application, it should be understood that "B corresponding to A" means that B is associated with A and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, but B can also be determined according to A and / or other information.

[0032] Below, the implementation process of the synchronization method, apparatus, network equipment, terminal, storage medium and program product provided in the embodiments of the present application is described in detail.

[0033] An embodiment of the present application provides a synchronization method, which is applied to a first cell. Here, the first cell is, for example, a target cell that a terminal needs to access. Figure 1 As shown, the method includes: Step 101: Send a first master information block MIB to a terminal, where the first MIB carries scheduling information of a first system information block SIB1.

[0034] Step 102: Send SIB1 to the terminal, where the SIB1 carries first indication information, and the first indication information is used to indicate whether secondary synchronization is performed.

[0035] That is to say, one bit may be added to the existing SIB1 to indicate whether secondary synchronization is required. For example, if it is clear based on a priori knowledge that there is PCI confusion between the first cell and at least one other cell, the first indication information is used to instruct the terminal to perform secondary synchronization. If it is clear based on a priori knowledge that there is no PCI confusion between the first cell and any other cell, the first indication information is used to instruct the terminal not to perform secondary synchronization. Exemplarily, the first indication information may be added to the noncelldefinizeSSB information element (IE) in SIB1, where the first indication information may also be referred to as a secondary synchronization configuration parameter.

[0036] Step 103: When the first indication information indicates secondary synchronization, a non-cell defining SSB (NCD-SSB) is sent to the terminal, where the NCD-SSB is used for the terminal to perform secondary synchronization.

[0037] Here, it should be noted that NCD-SSB refers to an SSB that is not associated with the remaining minimum system information (RMSI).

[0038] On the basis of the above step 103, the terminal performs secondary synchronization based on the received NCD-SSB to ensure that the information in the MIB subsequently acquired is synchronized with the parameters of the cell in the received SIB1 (the target cell to be accessed, which is the first cell in this embodiment) through secondary synchronization, thereby ensuring that the target cell can be successfully accessed subsequently.

[0039] Further, when the first indication information indicates no secondary synchronization, the terminal may perform a cell access procedure based on the currently received first MIB and SIB1.

[0040] In the synchronization method of the embodiment of the present application, first, a first MIB is sent to the terminal, and the first MIB carries the scheduling information of SIB1; secondly, SIB1 is sent to the terminal, and the SIB1 carries the first indication information, and the first indication information is used to indicate whether secondary synchronization is performed; thirdly, when the first indication information indicates secondary synchronization, a non-cell-defined synchronization signal block NCD-SSB is sent to the terminal, and the NCD-SSB is used for the terminal to perform secondary synchronization. In this way, through secondary synchronization, in the scenario of PCI confusion, the terminal can be synchronized with the cell corresponding to the best SSB found by measurement, and the parameters of the cell can be further obtained, so as to facilitate the subsequent terminal to successfully access the cell and solve the problem of terminal access failure due to PCI confusion.

[0041] As an optional implementation method, the SIB1 also carries resource location information of the NCD-SSB; exemplarily, when the first indication information indicates secondary synchronization, n bits may be added to the SIB, and the n bits carry the resource location information of the NCD-SSB.

[0042] Wherein, based on the above content, step 103 includes: The NCD-SSB is sent to the terminal on the resource corresponding to the resource location information of the NCD-SSB.

[0043] As a specific implementation, step 101 includes: A cell defining synchronization signal block (Cell Defining SSB, CD-SSB) is sent to the terminal, wherein the CD-SSB carries the first MIB, and the CD-SSB is used for the terminal to perform a synchronization.

[0044] Here, it should be noted that CD-SSB refers to the SSB associated with RMSI. Among them, CD-SSB carries synchronization signals (Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS)) and Physical Broadcast Channel (PBCH), wherein PBCH is used to transmit MIB. Therefore, in the embodiment of the present application, the first cell sends the first MIB by sending CD-SSB to the terminal.

[0045] As an optional implementation, the beam pattern of the NCD-SSB is the same as the beam pattern of the CD-SSB, and the physical random access channel PRACH resource positions corresponding to the beams of the same pattern are the same. In this way, after receiving the NCD-SSB, the terminal can still access the CD-SSB (previously received CD-SSB) position corresponding to the NCD-SSB.

[0046] Based on the above optional implementation methods, embodiments of the present application also include: the network device configures CD-SSB and NCD-SSB at different locations for each cell, wherein the beam pattern of the NCD-SSB of each cell is configured the same as the beam pattern of the CD-SSB, and the PRACH resource positions corresponding to beams of the same style are also the same; wherein the configuration of the CD-SSB can follow the existing method.

[0047] Furthermore, as an optional implementation, the method further includes: Based on the physical cell identifier PCI of the first cell, the resource location occupied by the NCD-SSB is determined, wherein the resource locations occupied by the NCD-SSB of different cells are different.

[0048] That is to say, the resource locations occupied by the NCD-SSB of each cell are related to the PCI of the cell, and the resource locations occupied by the NCD-SSB of each cell are different. In this way, it can be ensured that the NCD-SSB locations (occupied resources) of different cells no longer conflict.

[0049] As a specific implementation manner, determining the resource location occupied by the NCD-SSB based on the physical cell identifier PCI of the first cell includes at least one of the following: (1) Determine the frequency domain position occupied by the NCD-SSB according to the first remainder and the second remainder of N; wherein the first remainder is the remainder of the network device ID and the PCI of the first cell, and the area covered by the network device corresponding to the network device ID includes the first cell; N is related to the ratio of the total bandwidth to the number of physical resource blocks (PRBs) in the NCD-SSB; in other words, the position of the frequency domain resources occupied by the NCD-SSB can be represented by the second remainder, that is, the identifier (such as an index or ID, etc.) of the position of the frequency domain resources occupied by the NCD-SSB is the second remainder.

[0050] Exemplarily, N is related to the ratio of the total bandwidth and the number of PRBs in the NCD-SSB, for example, N is the value obtained by rounding the above ratio down, or N is the value obtained by rounding the above ratio up.

[0051] (2) Determine the initial time domain position occupied by the NCD-SSB according to the sum of the network device identification ID and a first random number; wherein the first random number is a random number between 1 and M; M is the ratio of the period of the NCD-SSB to the system subframe length; in other words, the initial position of the time domain resources occupied by the NCD-SSB can be represented by the sum of the network device ID and the first random number, that is, the identifier (such as an index or ID, etc.) of the initial position of the time domain resources occupied by the NCD-SSB is the sum of the network device ID and the first random number.

[0052] (3) Determine the frequency domain position occupied by the NCD-SSB according to the sum of the PCI of the first cell and a second random number; wherein the second random number is a random number between 1 and N; in other words, the position of the frequency domain resources occupied by the NCD-SSB can be represented by the sum of the PCI of the first cell and the second random number, that is, the identifier (such as an index or ID, etc.) of the position of the frequency domain resources occupied by the NCD-SSB is the sum of the PCI of the first cell and the second random number.

[0053] (4) Determine the initial time domain position occupied by the NCD-SSB according to the remainder of the PCI and M of the first cell; in other words, the initial position of the time domain resources occupied by the NCD-SSB can be expressed by the remainder of the PCI and M of the first cell, that is, the identifier (such as an index or ID, etc.) of the initial position of the time domain resources occupied by the NCD-SSB is the remainder of the PCI and M of the first cell.

[0054] (5) Determine the frequency domain position occupied by the NCD-SSB according to the remainder of the PCI of the first cell and N. In other words, the position of the frequency domain resources occupied by the NCD-SSB can be expressed by the remainder of the PCI of the first cell and N, that is, the identifier (such as an index or ID, etc.) of the position of the frequency domain resources occupied by the NCD-SSB is the remainder of the PCI of the first cell and N.

[0055] (6) Determine the initial position of the time domain occupied by the NCD-SSB according to the sum of the PCI of the first cell and the first random number. In other words, the initial position of the time domain resources occupied by the NCD-SSB can be represented by the sum of the PCI of the first cell and the first random number, that is, the identifier (such as an index or ID, etc.) of the initial position of the time domain resources occupied by the NCD-SSB is the sum of the PCI of the first cell and the first random number.

[0056] Here, it should be noted that, in the above specific implementation, firstly, the remainder of A and B represents the result of A modulo / MOD B, and the sum of A and B represents the result of adding A and B. Secondly, when calculating the frequency domain position or the time domain initial position, adding a random number can reduce the probability of NCD-SSB conflict.

[0057] Here, it should be noted that the examples of the above-mentioned specific implementation methods are as follows: Example 1, the frequency domain position of the resources occupied by the NCD-SSB is calculated according to the above-mentioned method (1), and the time domain initial position of the resources occupied by the NCD-SSB is calculated according to the above-mentioned method (2); Example 2, the frequency domain position of the resources occupied by the NCD-SSB is calculated according to the above-mentioned method (3), and the time domain initial position of the resources occupied by the NCD-SSB is calculated according to the above-mentioned method (4); Example 4, the frequency domain position of the resources occupied by the NCD-SSB is calculated according to the above-mentioned method (5), and the time domain initial position of the resources occupied by the NCD-SSB is calculated according to the above-mentioned method (6). Among them, the NCD-SSB occupies one resource in the frequency domain, and the NCD-SSB occupies 4 symbols in the time domain.

[0058] In the above specific implementation method, the time domain position and frequency domain position of the resources occupied by NCD-SSB respectively use the network equipment ID or the PCI of the first cell plus a random number module to stagger the time domain resources and frequency domain resources to avoid confusion between NCD-SSBs in different cells.

[0059] The embodiment of the present application also provides a synchronization method, which is applied to a terminal, such as Figure 2 As shown, the method includes: Step 201: Receive a first MIB sent by a network device, where the first MIB carries scheduling information of SIB1, and the coverage area of ​​the network device includes a first cell.

[0060] In the above step 201, the first MIB sent by the network device to the terminal includes the first MIB of one or more cells covered by the network device.

[0061] Step 202: Determine, according to the first MIB, that the target cell is the first cell.

[0062] The above step 202 may specifically be: the terminal searches the first MIB, and determines a target cell (a cell that the terminal expects to access) based on the search results.

[0063] Step 203: Receive SIB1 sent by the first cell according to the first MIB corresponding to the first cell, where the SIB1 carries first indication information, and the first indication information is used to indicate whether secondary synchronization is performed.

[0064] The above step 203 is to obtain the scheduling information of SIB1 by parsing the first MIB, and then receive SIB1 sent by the first cell based on the scheduling information of SIB1.

[0065] That is to say, one bit may be added to the existing SIB1 to indicate whether secondary synchronization is required. For example, if it is clear based on a priori knowledge that there is PCI confusion between the first cell and at least one other cell, the first indication information is used to instruct the terminal to perform secondary synchronization. If it is clear based on a priori knowledge that there is no PCI confusion between the first cell and any other cell, the first indication information is used to instruct the terminal not to perform secondary synchronization. Exemplarily, the first indication information may be added to the noncelldefinizeSSB IE in SIB1, where the first indication information may also be referred to as a secondary synchronization configuration parameter.

[0066] Step 204: When the first indication information indicates secondary synchronization, receive NCD-SSB according to the SIB1.

[0067] Step 205: Perform secondary synchronization according to the second MIB in the NCD-SSB.

[0068] In the above step 205, the terminal performs secondary synchronization based on the received NCD-SSB to ensure that the information in the acquired second MIB is synchronized with the parameters of the cell (the target cell to be accessed, that is, the first cell in this embodiment) in the received SIB1 through secondary synchronization, thereby ensuring that the target cell can be successfully accessed later. The second MIB, for example, carries a system frame number (SFN), SSB-index, k-SSB, etc.

[0069] Further, when the first indication information indicates no secondary synchronization, the terminal may perform a cell access procedure based on the currently received first MIB and SIB1.

[0070] In the synchronization method of the embodiment of the present application, first, a first MIB sent by a network device is received, the first MIB carries the scheduling information of SIB1, and the coverage area of ​​the network device includes a first cell; secondly, according to the first MIB, the target cell is determined to be the first cell; thirdly, according to the first MIB corresponding to the first cell, SIB1 sent by the first cell is received, the SIB1 carries the first indication information, and the first indication information is used to indicate whether secondary synchronization is performed; then, when the first indication information indicates secondary synchronization, NCD-SSB is received according to the SIB1; finally, secondary synchronization is performed according to the second MIB in the NCD-SSB. In this way, it can be ensured that the information carried in the acquired second MIB (such as SFN, SSB-index, k-SSB, etc.) is synchronized with the parameters of the cell in SIB1 (the target cell to be accessed, which is the first cell in this embodiment), ensuring that subsequent terminals can successfully access the target cell, and solving the problem of access failure caused by PCI confusion.

[0071] As an optional implementation, step 204 includes: The NCD-SSB is received on the resources corresponding to the resource location information of the NCD-SSB carried by the SIB1.

[0072] Here, it should be noted that, when the first indication information indicates secondary synchronization, the SIB1 also carries the resource location information of the NCD-SSB; illustratively, n bits may be added to the SIB, and the n bits carry the resource location information of the NCD-SSB.

[0073] Furthermore, as an optional implementation, the method further includes: Randomly access the first cell according to the SIB1 and the second MIB.

[0074] In the above optional implementation method, the terminal can initiate random access according to the IE (such as SFN, SSB-index, k-SSB) in the second MIB in the secondary synchronized NCD-SSB and the PRACH resources in the SIB1 message, so as to ensure the consistency of the cell configuration of the access cell, such as: alignment of time-frequency code spatial domain resources.

[0075] As a specific implementation, step 201 includes: Receive a CD-SSB sent by a network device, wherein the CD-SSB carries the first MIB, and the CD-SSB is used for the terminal to perform a synchronization.

[0076] Here, it should be noted that CD-SSB carries synchronization signals (PSS and SSS) and PBCH, wherein PBCH is used to transmit MIB. Therefore, in the embodiment of the present application, the network device sends the first MIB by sending CD-SSB to the terminal.

[0077] As an optional implementation method, the beam pattern of the NCD-SSB in the same cell is the same as the beam pattern of the CD-SSB, and the PRACH resource positions corresponding to the beams of the same pattern are the same.

[0078] Based on the above optional implementation methods, embodiments of the present application also include: the network device configures CD-SSB and NCD-SSB at different locations for each cell, wherein the beam pattern of the NCD-SSB of each cell is configured the same as the beam pattern of the CD-SSB, and the PRACH resource positions corresponding to beams of the same style are also the same; wherein the configuration of the CD-SSB can follow the existing method.

[0079] As an optional implementation method, the resource location occupied by the NCD-SSB is related to the PCI of the first cell, wherein the resource locations occupied by the NCD-SSB of different cells are different.

[0080] That is to say, the resource locations occupied by the NCD-SSB of each cell are related to the PCI of the cell, and the resource locations occupied by the NCD-SSB of each cell are different. In this way, it can be ensured that the NCD-SSB locations (occupied resources) of different cells no longer conflict.

[0081] As a specific implementation manner, the method for determining the resource location occupied by the NCD-SSB includes at least one of the following: (1) The frequency domain position is determined based on the first remainder and the second remainder of N; wherein the first remainder is the remainder of the network equipment ID and the PCI of the first cell; N is related to the ratio of the total bandwidth to the number of PRBs in the NCD-SSB; in other words, the position of the frequency domain resources occupied by the NCD-SSB can be represented by the second remainder, that is, the identifier (such as an index or ID, etc.) of the position of the frequency domain resources occupied by the NCD-SSB is the second remainder.

[0082] Exemplarily, N is related to the ratio of the total bandwidth and the number of PRBs in the NCD-SSB, for example, N is the value obtained by rounding the above ratio down, or N is the value obtained by rounding the above ratio up.

[0083] (2) The initial position in the time domain is determined based on the sum of the network device ID and a first random number; wherein the first remainder is the remainder of the network device ID and the PCI of the first cell; wherein the first random number is a random number between 1 and M; M is the ratio of the period of the NCD-SSB to the system subframe length; in other words, the initial position of the time domain resources occupied by the NCD-SSB can be represented by the sum of the network device ID and the first random number, that is, the identifier (such as an index or ID, etc.) of the initial position of the time domain resources occupied by the NCD-SSB is the sum of the network device ID and the first random number.

[0084] (3) The frequency domain position is determined based on the sum of the PCI of the first cell and a second random number; wherein the second random number is a random number between 1 and N; in other words, the position of the frequency domain resources occupied by the NCD-SSB can be represented by the sum of the PCI of the first cell and the second random number, that is, the identifier (such as an index or ID, etc.) of the position of the frequency domain resources occupied by the NCD-SSB is the sum of the PCI of the first cell and the second random number.

[0085] (4) The initial position in the time domain is based on the remainder of the PCI of the first cell and M. In other words, the initial position of the time domain resources occupied by the NCD-SSB can be expressed by the remainder of the PCI of the first cell and M, that is, the identifier (such as an index or ID, etc.) of the initial position of the time domain resources occupied by the NCD-SSB is the remainder of the PCI of the first cell and M.

[0086] (5) The frequency domain position is determined based on the remainder of the PCI of the first cell and N. In other words, the position of the frequency domain resources occupied by the NCD-SSB can be represented by the remainder of the PCI of the first cell and N, that is, the identifier (such as an index or ID, etc.) of the position of the frequency domain resources occupied by the NCD-SSB is the remainder of the PCI of the first cell and N.

[0087] (6) The time domain initial position is determined based on the sum of the PCI of the first cell and the first random number. In other words, the initial position of the time domain resources occupied by the NCD-SSB can be represented by the sum of the PCI of the first cell and the first random number, that is, the identifier (such as an index or ID, etc.) of the initial position of the time domain resources occupied by the NCD-SSB is the sum of the PCI of the first cell and the first random number.

[0088] Here, it should be noted that, in the above specific implementation, firstly, the remainder of A and B represents the result of A modulo / MOD B, and the sum of A and B represents the result of adding A and B. Secondly, when calculating the frequency domain position or the time domain initial position, adding a random number can reduce the probability of NCD-SSB conflict.

[0089] Here, it should be noted that the examples of the above-mentioned specific implementation methods are as follows: Example 1, the frequency domain position of the resources occupied by the NCD-SSB is calculated according to the above-mentioned method (1), and the time domain initial position of the resources occupied by the NCD-SSB is calculated according to the above-mentioned method (2); Example 2, the frequency domain position of the resources occupied by the NCD-SSB is calculated according to the above-mentioned method (3), and the time domain initial position of the resources occupied by the NCD-SSB is calculated according to the above-mentioned method (4); Example 4, the frequency domain position of the resources occupied by the NCD-SSB is calculated according to the above-mentioned method (5), and the time domain initial position of the resources occupied by the NCD-SSB is calculated according to the above-mentioned method (6). Among them, the NCD-SSB occupies one resource in the frequency domain, and the NCD-SSB occupies 4 symbols in the time domain.

[0090] In the above specific implementation method, the time domain position and frequency domain position of the resources occupied by NCD-SSB respectively use the network equipment ID or the PCI of the first cell plus a random number module to stagger the time domain resources and frequency domain resources to avoid confusion between NCD-SSBs in different cells.

[0091] A specific example of the synchronization method in the embodiment of the present application is as follows Figure 3 As shown, the following steps are included: Step 301, the first cell sends MIB to the terminal; this step corresponds to the aforementioned first cell sending the first MIB to the terminal, and the scheduling information of the first MIB bottom SIB.

[0092] Step 302, the first cell sends SIB1 to the terminal; this step corresponds to the aforementioned first cell sending SIB1 to the terminal, the SIB1 carries first indication information, the first indication information is used to indicate whether secondary synchronization occurs; wherein, in this example, the first indication information is used to indicate secondary synchronization of the terminal.

[0093] Step 303, the first cell sends NCD-SSB to the terminal; this step corresponds to the aforementioned sending of a non-cell defined synchronization signal block NCD-SSB to the terminal when the first indication information indicates secondary synchronization, and the NCD-SSB is used for the terminal to perform secondary synchronization.

[0094] In step 304, the terminal initiates a first message (Message1, MSG1) using the NCD-SSB index and SIB1 PRACH; this step corresponds to the aforementioned performing secondary synchronization according to the second MIB in the NCD-SSB, and randomly accessing the first cell according to the SIB1 and the second MIB.

[0095] The above synchronization method of the embodiment of the present application, first, implements the use of a secondary synchronization solution to ensure the uplink and downlink synchronization of the terminal when the terminal is in the IDEL state, so that the terminal can successfully access the cell and reside there. Second, the network device configures the corresponding NCD-SSB while configuring the CD-SSB for the cell. In order to avoid confusion between the NCD-SSBs of different cells, the time domain position and frequency domain position of the resources occupied by the NCD-SSB are respectively staggered by the network device (such as base station) ID or PCI plus random modulus to stagger the time domain and frequency domain resources; third, by adding the first indication information in SIB1, specifically adding the secondary synchronization configuration parameter in the noncelldefinizeSSB IE of SIB1, after receiving this parameter, the terminal receives the MIB of the NCD-SSB again after receiving SIB1 (corresponding to the aforementioned second MIB), to ensure that the MIB is synchronized with the parameters of the cell in SIB1, and then initiates random access.

[0096] That is to say, the synchronization method of the embodiment of the present application, through secondary synchronization, adds a secondary synchronization switch (corresponding to the aforementioned first indication information) in the NCD-SSB configuration of SIB1. After receiving the SIB1 containing the switch on flag, the terminal receives the NCD-SSB, obtains the MIB message configuration of the same cell as SIB1, completes the uplink and downlink synchronization of the cell, and initiates random access to access the cell. In this way, the problem of user access and resident failure after PCI confusion occurs in the IDLE state in the low-altitude scenario can be solved.

[0097] The embodiment of the present application also provides a synchronization device, which is applied to a network device, and specifically applied to a first cell of the network device, such as Figure 4 As shown, the device comprises: A first sending module 401 is configured to send a first master information block MIB to a terminal, where the first MIB carries scheduling information of a first system information block SIB1; The second sending module 402 is used to send SIB1 to the terminal, where the SIB1 carries first indication information, and the first indication information is used to indicate whether to perform secondary synchronization; The third sending module 403 is used to send a non-cell defined synchronization signal block NCD-SSB to the terminal when the first indication information indicates secondary synchronization, and the NCD-SSB is used for the terminal to perform secondary synchronization.

[0098] Wherein, the SIB1 also carries the resource location information of the NCD-SSB; On the basis of the above, the third sending module 403 is specifically used to: send the NCD-SSB to the terminal on the resources corresponding to the resource location information of the NCD-SSB.

[0099] The first sending module 401 is specifically used to send a cell definition synchronization signal block CD-SSB to the terminal, wherein the CD-SSB carries the first MIB, and the CD-SSB is used for the terminal to perform a synchronization.

[0100] Among them, the beam pattern of the NCD-SSB is the same as the beam pattern of the CD-SSB, and the physical random access channel PRACH resource positions corresponding to the beams of the same pattern are the same.

[0101] Furthermore, the device also includes: A determination module is used to determine the resource location occupied by the NCD-SSB based on the physical cell identifier PCI of the first cell, wherein the resource locations occupied by the NCD-SSB of different cells are different.

[0102] The determining module is specifically configured to perform at least one of the following: Determine the frequency domain position occupied by the NCD-SSB according to the first remainder and the second remainder of N; wherein the first remainder is the remainder of the network device ID and the PCI of the first cell, and the area covered by the network device corresponding to the network device ID includes the first cell; N is related to the ratio of the total bandwidth to the number of physical resource blocks PRB in the NCD-SSB; Determine the initial time domain position occupied by the NCD-SSB according to the sum of the network device identification ID and the first random number; wherein the first random number is a random number between 1 and M; M is the ratio of the NCD-SSB period to the system subframe length; Determine the frequency domain position occupied by the NCD-SSB according to the sum of the PCI of the first cell and a second random number; wherein the second random number is a random number between 1 and N; Determine, according to the remainder of the PCI of the first cell and M, an initial time domain position occupied by the NCD-SSB; Determine, according to the remainder of the PCI of the first cell and N, a frequency domain position occupied by the NCD-SSB; The initial time domain position occupied by the NCD-SSB is determined according to the sum of the PCI of the first cell and the first random number.

[0103] It should be noted here that the above-mentioned synchronization device provided in the embodiment of the present application can implement all the method steps implemented in the above-mentioned synchronization method embodiment applied to the first cell, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as the method embodiment will not be described in detail here.

[0104] The embodiment of the present application also provides a synchronization device, which is applied to a terminal, such as Figure 5 As shown, the device comprises: A first receiving module 501 is configured to receive a first MIB sent by a network device, where the first MIB carries scheduling information of SIB1, and the coverage area of ​​the network device includes a first cell; A determination module 502, configured to determine, according to the first MIB, that the target cell is the first cell; A second receiving module 503 is configured to receive SIB1 sent by the first cell according to the first MIB corresponding to the first cell, where the SIB1 carries first indication information, and the first indication information is used to indicate whether secondary synchronization is performed; A third receiving module 504 is configured to receive NCD-SSB according to the SIB1 when the first indication information indicates secondary synchronization; The synchronization module 505 is used to perform secondary synchronization according to the second MIB in the NCD-SSB.

[0105] The third receiving module 504 is specifically used to receive the NCD-SSB on the resources corresponding to the resource location information of the NCD-SSB carried by the SIB1.

[0106] Furthermore, the device also includes: A processing module is used to randomly access the first cell according to the SIB1 and the second MIB.

[0107] Among them, the first receiving module 501 is specifically used to: receive the CD-SSB sent by the network device, wherein the CD-SSB carries the first MIB, and the CD-SSB is used for the terminal to perform a synchronization.

[0108] Among them, the beam pattern of the NCD-SSB in the same cell is the same as the beam pattern of the CD-SSB, and the PRACH resource positions corresponding to the beams of the same pattern are the same.

[0109] The resource location occupied by the NCD-SSB is related to the PCI of the first cell, and the resource locations occupied by the NCD-SSB of different cells are different.

[0110] The method for determining the resource location occupied by the NCD-SSB includes at least one of the following: The frequency domain position is determined based on the first remainder and the second remainder of N; wherein the first remainder is the remainder of the network equipment ID and the PCI of the first cell; N is related to the ratio of the total bandwidth to the number of physical resource blocks PRB in the NCD-SSB; The time domain initial position is determined based on the sum of the network device ID and the first random number; wherein the first remainder is the remainder of the network device ID and the PCI of the first cell; wherein the first random number is a random number between 1 and M; M is the ratio of the period of NCD-SSB to the system subframe length; The frequency domain position is determined based on the sum of the PCI of the first cell and a second random number; wherein the second random number is a random number between 1 and N; The time domain initial position is based on the remainder of the PCI of the first cell and M; The frequency domain position is determined based on the remainder of the PCI of the first cell and N; The time domain initial position is determined based on the sum of the PCI of the first cell and the first random number.

[0111] It should be noted here that the above-mentioned synchronization device provided in the embodiment of the present application can implement all the method steps implemented in the above-mentioned synchronization method embodiment applied to the terminal, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as the method embodiment will not be described in detail here.

[0112] An embodiment of the present application also provides a network device, including a transceiver 610, a processor 600, a memory 620, and a program stored in the memory 620 and executable on the processor 600; wherein, when the processor 600 executes the program, the synchronization method applied to the first cell as described above is implemented.

[0113] The transceiver 610 is used to receive and send data under the control of the processor 600 .

[0114] Among them, Figure 6In the embodiment of the present invention, the bus architecture may include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by processor 600 and memory represented by memory 620. The bus architecture may also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are not further described herein. The bus interface provides an interface. The transceiver 610 may be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium.

[0115] The processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 can store data used by the processor 700 when performing operations.

[0116] An embodiment of the present application also provides a terminal, including a transceiver 710, a processor 700, a memory 720, and a program stored in the memory 720 and executable on the processor 700; wherein, when the processor 700 executes the program, the synchronization method applied to the terminal as described above is implemented.

[0117] The transceiver 710 is used to receive and send data under the control of the processor 700.

[0118] Among them, Figure 7 In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 700 and various circuits of memory represented by memory 720 are linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 710 may be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium. For different terminals, the user interface 730 may also be an interface capable of externally and internally connecting required devices, and the connected devices include but are not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

[0119] The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 can store data used by the processor 700 when performing operations.

[0120] The embodiment of the present application also provides a readable storage medium, on which a program is stored, and when the program is executed by the processor, the synchronization method applied to the first cell as described above is implemented, or the synchronization method applied to the terminal as described above is implemented, and the same technical effect can be achieved. To avoid repetition, it is not repeated here. The readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0121] 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 this 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), and includes a number of instructions for executing the methods described in each embodiment of the present application.

[0122] Therefore, an embodiment of the present application also provides a computer program product, including computer instructions, which, when executed by a processor, implement the synchronization method applied to the first cell as described above, or implement the synchronization method applied to the terminal as described above, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0123] The above exemplary embodiments are described with reference to the accompanying drawings, and many different forms and embodiments are feasible without departing from the spirit and teachings of the present application. Therefore, the present application should not be constructed as a limitation of the exemplary embodiments proposed herein. More specifically, these exemplary embodiments are provided so that the present application will be perfect and complete, and the scope of the present application will be conveyed to those who are familiar with the technology. In these figures, the component sizes and relative sizes may be exaggerated for clarity. The terms used here are only based on the purpose of describing specific exemplary embodiments and are not intended to be limiting. As used herein, unless the text clearly indicates otherwise, the singular forms "one", "an" and "the" are intended to include these multiple forms. It will be further understood that the terms "comprising" and / or "including" when used in this specification indicate the presence of the features, integers, steps, operations, components and / or components, but do not exclude the presence or increase of one or more other features, integers, steps, operations, components, components and / or their groups. Unless otherwise indicated, when stated, a range of values ​​includes the upper and lower limits of that range and any subranges therebetween.

[0124] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A synchronization method, characterized in that: Applied to the first cell, including: Sending a first master information block MIB to the terminal, where the first MIB carries scheduling information of a first system information block SIB1; Sending SIB1 to the terminal, where the SIB1 carries first indication information, where the first indication information is used to indicate whether secondary synchronization is performed; In the case where the first indication information indicates secondary synchronization, a non-cell defined synchronization signal block NCD-SSB is sent to the terminal, and the NCD-SSB is used for the terminal to perform secondary synchronization.

2. The method according to claim 1, characterized in that The SIB1 also carries resource location information of the NCD-SSB; The sending of a non-defined cell synchronization signal block NCD-SSB to the terminal includes: The NCD-SSB is sent to the terminal on the resource corresponding to the resource location information of the NCD-SSB.

3. The method according to claim 1, characterized in that Sending a first master information block MIB to the terminal includes: A cell definition synchronization signal block CD-SSB is sent to the terminal, wherein the CD-SSB carries the first MIB, and the CD-SSB is used for the terminal to perform a synchronization.

4. The method according to claim 3, characterized in that The beam pattern of the NCD-SSB is the same as the beam pattern of the CD-SSB, and the physical random access channel PRACH resource positions corresponding to beams of the same pattern are the same.

5. The method according to claim 1, characterized in that The method further comprises: Based on the physical cell identifier PCI of the first cell, the resource location occupied by the NCD-SSB is determined, wherein the resource locations occupied by the NCD-SSB of different cells are different.

6. The method according to claim 5, characterized in that Determining, based on a physical cell identifier PCI of the first cell, a resource location occupied by the NCD-SSB, including at least one of the following: Determine the frequency domain position occupied by the NCD-SSB according to the first remainder and the second remainder of N; wherein the first remainder is the remainder of the network device ID and the PCI of the first cell, and the area covered by the network device corresponding to the network device ID includes the first cell; N is related to the ratio of the total bandwidth to the number of physical resource blocks PRB in the NCD-SSB; Determine the initial time domain position occupied by the NCD-SSB according to the sum of the network device identification ID and the first random number; wherein the first random number is a random number between 1 and M; M is the ratio of the NCD-SSB period to the system subframe length; Determine the frequency domain position occupied by the NCD-SSB according to the sum of the PCI of the first cell and a second random number; wherein the second random number is a random number between 1 and N; Determine, according to the remainder of the PCI of the first cell and M, an initial time domain position occupied by the NCD-SSB; Determine, according to the remainder of the PCI of the first cell and N, a frequency domain position occupied by the NCD-SSB; The initial time domain position occupied by the NCD-SSB is determined according to the sum of the PCI of the first cell and the first random number.

7. A synchronization method, characterized in that: Applied to terminals, including: receiving a first MIB sent by a network device, where the first MIB carries scheduling information of SIB1, and a coverage area of ​​the network device includes a first cell; Determine, according to the first MIB, that the target cell is the first cell; receiving, according to a first MIB corresponding to the first cell, SIB1 sent by the first cell, where the SIB1 carries first indication information, and the first indication information is used to indicate whether secondary synchronization is performed; When the first indication information indicates secondary synchronization, receiving NCD-SSB according to the SIB1; According to the second MIB in the NCD-SSB, a secondary synchronization is performed.

8. The method according to claim 7, characterized in that According to the SIB1, receiving the NCD-SSB includes: The NCD-SSB is received on the resources corresponding to the resource location information of the NCD-SSB carried by the SIB1.

9. The method according to claim 7, characterized in that: The method further comprises: Randomly access the first cell according to the SIB1 and the second MIB.

10. The method according to claim 7, characterized in that The first MIB sent by the receiving network device includes: Receive a CD-SSB sent by a network device, wherein the CD-SSB carries the first MIB, and the CD-SSB is used for the terminal to perform a synchronization.

11. The method according to claim 10, characterized in that The beam pattern of the NCD-SSB in the same cell is the same as the beam pattern of the CD-SSB, and the PRACH resource positions corresponding to the beams of the same pattern are the same.

12. The method according to claim 7, characterized in that The resource location occupied by the NCD-SSB is related to the PCI of the first cell, wherein the resource locations occupied by the NCD-SSB of different cells are different.

13. The method according to claim 12, characterized in that The method for determining the resource location occupied by the NCD-SSB includes at least one of the following: The frequency domain position is determined based on the first remainder and the second remainder of N; wherein the first remainder is the remainder of the network equipment ID and the PCI of the first cell; N is related to the ratio of the total bandwidth to the number of physical resource blocks PRB in the NCD-SSB; The time domain initial position is determined based on the sum of the network device ID and the first random number; wherein the first remainder is the remainder of the network device ID and the PCI of the first cell; wherein the first random number is a random number between 1 and M; M is the ratio of the period of NCD-SSB to the system subframe length; The frequency domain position is determined based on the sum of the PCI of the first cell and a second random number; wherein the second random number is a random number between 1 and N; The time domain initial position is based on the remainder of the PCI of the first cell and M; The frequency domain position is determined based on the remainder of the PCI of the first cell and N; The time domain initial position is determined based on the sum of the PCI of the first cell and the first random number.

14. A synchronization device, characterized in that: Applied to network equipment, including: A first sending module, configured to send a first master information block MIB to a terminal, where the first MIB carries scheduling information of a first system information block SIB1; A second sending module, configured to send SIB1 to the terminal, where the SIB1 carries first indication information, and the first indication information is used to indicate whether secondary synchronization is performed; The third sending module is used to send a non-cell defined synchronization signal block NCD-SSB to the terminal when the first indication information indicates secondary synchronization, and the NCD-SSB is used for the terminal to perform secondary synchronization.

15. A synchronization device, characterized in that: Applied to terminals, including: A first receiving module, configured to receive a first MIB sent by a network device, wherein the first MIB carries scheduling information of SIB1, and a coverage area of ​​the network device includes a first cell; a determination module, configured to determine, according to the first MIB, that the target cell is the first cell; A second receiving module, configured to receive, according to a first MIB corresponding to the first cell, SIB1 sent by the first cell, where the SIB1 carries first indication information, and the first indication information is used to indicate whether secondary synchronization is performed; A third receiving module is configured to receive NCD-SSB according to the SIB1 when the first indication information indicates secondary synchronization; A synchronization module is used to perform secondary synchronization according to the second MIB in the NCD-SSB.

16. A network device comprising a transceiver, a processor, a memory, and a program stored in the memory and executable on the processor; characterized in that: When the processor executes the program, the synchronization method according to any one of claims 1 to 6 is implemented.

17. A terminal comprising a transceiver, a processor, a memory, and a program stored in the memory and executable on the processor; characterized in that: When the processor executes the program, the synchronization method according to any one of claims 7 to 13 is implemented.

18. A readable storage medium having a program or instruction stored thereon, characterized in that: When the program or instruction is executed by a processor, the synchronization method according to any one of claims 1 to 6 is implemented, or the synchronization method according to any one of claims 7 to 13 is implemented.

19. A computer program product, characterized in that It comprises computer instructions, which, when executed by a processor, implement the synchronization method as claimed in any one of claims 1 to 6, or implement the synchronization method as claimed in any one of claims 7 to 13.

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