Cell handover method, device, network device, terminal, storage medium and product

Abstract

The present invention provides a cell handover method, apparatus, network device, terminal, storage medium and product, relating to the field of communication technologies. The cell handover method includes: receiving a handover request sent by a second network device; the handover request includes the location information of the terminal and the first SSB index of a third cell measured by the terminal; in the case where it is determined according to the location information that the terminal is located in the beam coverage range corresponding to the second SSB index of the first cell and the first SSB index of the third cell matches the second SSB index of the first cell, sending a handover response message to the second network device. The present invention performs subsequent handover procedures on the premise that the first SSB index of the third cell measured by the terminal matches the second SSB index of the first cell of the terminal, ensuring that the beam directions of the terminal and the target cell match.

Description

Technical Field

[0001] The present invention relates to the field of communication technologies, and particularly to a cell handover method, apparatus, network device, terminal, storage medium, and product. Background Art

[0002] The 3rd generation partnership project (3GPP) protocol associates physical random access channel (PRACH) resources in different frequency domains with synchronization signal block / physical broadcast channel block index (SSB index), or associates different preambles with the SSB index. The base station can infer that the synchronization signal block / physical broadcast channel block (SSB) corresponding to this terminal is the best downlink beam by detecting the preamble index in different time domains or frequency domains.

[0003] In the existing cell handover process, the terminal first receives the measurement and control message of the source cell, then the terminal measures the master information block (MIB) of the cells on each frequency point, obtains the SSB index of the measured cell from the lowest four bits of the MIB, and then reports the SSB-Index of the measured cell to the source cell in the measurement report. The source cell sends the SSB-Index of the measured cell to the target cell through the handover process, and the target cell selects the PRACH resource corresponding to the random access channel occasion (RO) of the SSB index for the terminal.

[0004] However, the existing low-altitude coverage scenario is in an environment where radio signals propagate along the Line-Of-Sight (LOS) path. There is serious cross-interference of radio signals, the cell coverage radius is relatively far, and the coverage radius is relatively large. Moreover, in the low-altitude coverage scenario, there is co-frequency coverage of air and ground, that is, within the area covered by a cell in the air, there are a large number of ground cells, resulting in a doubling of the probability of Physical Cell Identifier (PCI) confusion. This will lead to the situation that in the cell handover process, the terminal measures the SSB-Index of cell A, but is reconfigured with the SSB-Index of cell B. Since the SSB-Index of cell A is different from that of cell B, the terminal cannot receive MSG2 under the beam of the SSB-Index of cell B, thus resulting in a handover failure. Summary of the Invention

[0005] The present invention provides a cell handover method, apparatus, network device, terminal, storage medium and product, which are used to solve the problem of handover failure caused by the inconsistency between the SSB index of the cell measured by the terminal and the SSB index of the target cell in the existing cell handover process.

[0006] In order to solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a cell handover method, which is applied to a first network device. The method includes:

[0008] Receiving a handover request sent by a second network device, where the handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device; wherein, the handover request includes the location information of the terminal and the first Synchronization Signal Block / Physical Broadcast Channel Block (SSB) index of a third cell measured by the terminal;

[0009] When it is determined according to the location information that the terminal is located within the beam coverage range corresponding to the second SSB index of the first cell, and the first SSB index of the third cell matches the second SSB index of the first cell, sending a handover response message to the second network device; the handover response message is used to indicate that the first network device allows the terminal to be handed over to the first cell.

[0010] Optionally, the method further includes:

[0011] When it is determined according to the location information that the terminal is located in the beam coverage range corresponding to the second SSB index of the first cell, and the first SSB index of the third cell does not match the second SSB index of the first cell, a random access response MSG2 is sent to the terminal in all beam directions of the first cell;

[0012] Receive a radio resource control (RRC) reconfiguration complete message sent by the terminal, where the RRC reconfiguration complete message includes the SSB index of the beam on which the terminal receives the random access response MSG2.

[0013] Optionally, the method further includes:

[0014] When it is determined according to the location information that the terminal is located in the beam coverage range corresponding to the second SSB index of the first cell, and the first SSB index of the third cell does not match the second SSB index of the first cell, first data information is sequentially sent on the physical downlink shared channel (PDSCH) resource positions corresponding to each beam of the first cell, where the first data information includes a random access response MSG2 and the SSB index corresponding to the beam;

[0015] Receive an RRC reconfiguration complete message sent by the terminal, where the RRC reconfiguration complete message includes the SSB index of the first beam in the first cell, where the first beam is the beam on which the terminal receives the first data information.

[0016] Optionally, the method further includes:

[0017] Send first indication information to the second network device, where the first indication information is used to indicate the PDSCH resource positions corresponding to each beam of the first cell.

[0018] Optionally, the precoding matrix indicator (PMI) applicable to the first data information corresponding to different beams in the first cell is different.

[0019] Optionally, the method further includes:

[0020] When the physical cell identifier (PCI) of the third cell is the same as the PCI of the first cell, and the first SSB index and the second SSB index are the same, it is determined that the first SSB index of the third cell does not match the second SSB index of the first cell.

[0021] Optionally, the method further includes:

[0022] Send second indication information to the second network device, where the second indication information is used to indicate that the first SSB index of the third cell does not match the second SSB index of the first cell, and / or to indicate that the second network device switches the terminal to a fourth cell corresponding to a third network device.

[0023] Optionally, the method further includes:

[0024] When the terminal is not within the coverage area of the first cell, send third indication information to the second network device, where the third indication information is used to indicate that the terminal is not within the coverage area of the first cell.

[0025] In a second aspect, an embodiment of the present invention further provides a cell handover method applied to a second network device. The method includes:

[0026] Send a handover request to a first network device, where the handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device; wherein, the handover request includes location information of the terminal and a first SSB index of a third cell measured by the terminal.

[0027] Receive a handover response message sent by the first network device, where the handover response message is used to indicate that the first network device allows the terminal to be switched to the first cell.

[0028] Optionally, the method further includes:

[0029] Receive the location information of the terminal and the first SSB index of the third cell measured by the terminal sent by the terminal.

[0030] Optionally, the method further includes:

[0031] Receive second indication information sent by the first network device, where the second indication information is used to indicate that the first SSB index of the third cell does not match the second SSB index of the first cell, and / or to indicate that the second network device switches the terminal to a fourth cell corresponding to a third network device.

[0032] Optionally, the method further includes:

[0033] Receive third indication information sent by the first network device, where the third indication information is used to indicate that the terminal is not within the coverage area of the first cell.

[0034] In a third aspect, an embodiment of the present invention further provides a cell handover method applied to a terminal. The method includes:

[0035] Send the location information of the terminal and the first SSB index of the third cell measured by the terminal to a second network device;

[0036] Wherein, the second network device is configured to send a handover request to a first network device and receive a handover response message sent by the first network device;

[0037] Wherein, the handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device; the handover request includes the location information of the terminal and the first SSB index of the third cell measured by the terminal; the handover response message is used to indicate that the first network device allows the terminal to be handed over to the first cell.

[0038] Optionally, the method further includes:

[0039] Receive a random access response MSG2 sent by the first network device in all beam directions of a first cell corresponding to the first network device;

[0040] Send an RRC reconfiguration complete message to the first network device, where the RRC reconfiguration complete message includes the SSB index of the beam on which the terminal receives the random access response MSG2.

[0041] Optionally, the method further includes:

[0042] Receive first data information at a PDSCH resource position corresponding to each beam direction of a first cell corresponding to the first network device, where the first data information includes a random access response MSG2 and the SSB index corresponding to the beam;

[0043] Send an RRC reconfiguration complete message to the first network device, where the RRC reconfiguration complete message includes the SSB index of a first beam in the first cell, and the first beam is the beam on which the terminal receives the first data information.

[0044] Optionally, precoding matrix indicators PMI applicable to the first data information corresponding to different beams in the first cell are different.

[0045] In a fourth aspect, an embodiment of the present invention further provides a cell handover device, where the device includes:

[0046] A first receiving module, configured to receive a handover request sent by a second network device, where the handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to a first network device; wherein, the handover request includes the location information of the terminal and the first synchronization signal block / physical broadcast channel block SSB index of the third cell measured by the terminal;

[0047] A first sending module, configured to send a handover response message to the second network device when it is determined according to the location information that the terminal is located in the beam coverage range corresponding to the second SSB index of the first cell, and the first SSB index of the third cell matches the second SSB index of the first cell; the handover response message is used to indicate that the first network device allows the terminal to be handed over to the first cell.

[0048] In a fifth aspect, an embodiment of the present invention further provides a cell handover device, where the device includes:

[0049] A second sending module, configured to send a handover request to a first network device, where the handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device; where the handover request includes the location information of the terminal and the first SSB index of a third cell measured by the terminal.

[0050] A second receiving module, configured to receive a handover response message sent by the first network device, where the handover response message is used to indicate that the first network device allows the terminal to be handed over to the first cell.

[0051] In a sixth aspect, an embodiment of the present invention further provides a cell handover device, where the device includes:

[0052] A third sending module, configured to send the location information of the terminal and the first SSB index of a third cell measured by the terminal to the second network device.

[0053] Wherein, the second network device is configured to send a handover request to the first network device and receive a handover response message sent by the first network device.

[0054] Wherein, the handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device; the handover request includes the location information of the terminal and the first SSB index of a third cell measured by the terminal; the handover response message is used to indicate that the first network device allows the terminal to be handed over to the first cell.

[0055] In a seventh aspect, an embodiment of the present invention further provides a network device, including: a processor, a memory, and a program stored on the memory and executable on the processor, where when the program is executed by the processor, it implements the steps in the cell handover method described in any item of the first aspect, or implements the steps in the cell handover method described in any item of the second aspect.

[0056] In an eighth aspect, an embodiment of the present invention further provides a terminal, including: a processor, a memory, and a program stored on the memory and executable on the processor. When the program is executed by the processor, the steps in the cell handover method described in any one of the third aspects are implemented.

[0057] In a ninth aspect, an embodiment of the present invention further provides a readable storage medium, on which a program is stored. When the program is executed by a processor, the steps in the cell handover method described in any one of the first aspects are implemented, or the steps in the cell handover method described in any one of the second aspects are implemented, or the steps in the cell handover method described in any one of the third aspects are implemented.

[0058] In a tenth aspect, an embodiment of the present invention further provides a computer program product, including computer instructions. When the computer instructions are executed by a processor, the steps in the cell handover method described in any one of the first aspects are implemented, or the steps in the cell handover method described in any one of the second aspects are implemented, or the steps in the cell handover method described in any one of the third aspects are implemented.

[0059] The beneficial effects of the present invention are as follows:

[0060] For the cell handover method provided by the solution of the present invention, a first network device receives a handover request sent by a second network device. The handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device. Wherein, the handover request includes the location information of the terminal and the first SSB index of a third cell measured by the terminal. The second network device determines whether the terminal is within the beam coverage range of the second SSB index of the first cell according to the location information. If the terminal is located within the beam coverage range of the second SSB index of the first cell, it is determined whether the first SSB index of the third cell measured by the terminal matches (or is confused with) the second SSB index of the first cell. If it is determined that they match (no confusion occurs), a handover response message is sent to the second network device to start a normal handover process. The present invention estimates the second SSB index of the terminal in the first cell through the location information of the terminal, and under the condition that the first SSB index of the third cell measured by the terminal matches the second SSB index of the terminal in the first cell, performs the subsequent handover process, ensuring that the beam direction of the terminal matches the target cell, and avoiding the problem of handover failure caused by the mismatch between the beam direction of the terminal and the target cell. Description of the Drawings

[0061] Figure 1 It represents a flowchart of the cell handover method applied to the first network device provided by the embodiment of the present invention;

[0062] Figure 2It represents the specific flowchart of the cell handover method provided by the embodiments of the present invention;

[0063] Figure 3 It represents the flowchart of the cell handover method applied to the second network device provided by the embodiments of the present invention;

[0064] Figure 4 It represents the flowchart of the cell handover method applied to the terminal provided by the embodiments of the present invention;

[0065] Figure 5 It represents one of the schematic structural diagrams of the cell handover device provided by the embodiments of the present invention;

[0066] Figure 6 It represents another schematic structural diagram of the cell handover device provided by the embodiments of the present invention;

[0067] Figure 7 It represents yet another schematic structural diagram of the cell handover device provided by the embodiments of the present invention;

[0068] Figure 8 It represents the schematic structural diagram of the network device provided by the embodiments of the present invention;

[0069] Figure 9 It represents the schematic structural diagram of the terminal provided by the embodiments of the present invention. Detailed implementation manners

[0070] To make the technical problems to be solved, technical solutions and advantages of this application clearer, the following will be described in detail in conjunction with the accompanying drawings and specific embodiments. In the following description, providing specific details such as specific configurations and components is only to help comprehensively understand the embodiments of this application. Therefore, those skilled in the art should clearly understand that various changes and modifications can be made to the embodiments described here without departing from the scope and spirit of this application. In addition, descriptions of known functions and structures are omitted for clarity and conciseness.

[0071] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of this application. Therefore, the "in one embodiment" or "in an embodiment" that appears throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0072] In various embodiments of this application, it should be understood that the magnitudes of the serial numbers of the following processes do not mean the order of execution is prior or subsequent, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of this application.

[0073] In the embodiments provided in the present 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, and B can also be determined according to A and / or other information.

[0074] In the embodiments of the present invention, the term "and / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0075] Before describing the specific implementation manner of the present invention, the problem of SSB index confusion caused by PCI confusion in the cell is described as follows:

[0076] (1) Each cell broadcasts 5 SSBs.

[0077] (2) The terminal measures and finds that the beam corresponding to SSB2 of cell A is the best (the best SSB2). However, for the terminal, the downlink beam pair has been formed at this time (the base station sends beam SSB2 and the terminal receives the beam), but the base station does not know the information of this beam pair yet.

[0078] (3) The terminal receives the beam in the direction of the best SSB2, and in turn sends a PRACH in this direction. According to the association relationship between the PRACH and the SSB index, the PRACH or preamble resource is selected. In this way, when the base station receives the PRACH or preamble, it will, according to the mapping relationship, inversely deduce that the beam in the direction of the downlink SSB 2 is the best downlink beam of the terminal, and all subsequent downlink transmissions to the terminal are performed in the beam direction of SSB2.

[0079] (4) However, it may happen that the terminal reports SSB 2 of cell A, but the base station sends information in the beam direction of SSB 2 of cell B, resulting in the terminal being unable to receive downlink data in the beam direction of SSB 2 of cell B, that is, the problem of SSB index confusion caused by PCI confusion in the cell, resulting in the failure of the random access process of the terminal.

[0080] To solve the problem of handover failure caused by the inconsistency between the SSB index of the cell measured by the terminal and the SSB index of the target cell in the existing cell handover process, the embodiments of the present invention provide a cell handover method, apparatus, network device, terminal, storage medium and product.

[0081] As Figure 1 shown, the embodiments of the present invention provide a cell handover method applied to a first network device, and the method includes:

[0082] Step 101: Receive a handover request sent by a second network device. The handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device. Wherein, the handover request includes location information of the terminal and a first synchronization signal block / physical broadcast channel block (SSB) index of a third cell measured by the terminal.

[0083] It should be noted that the cell handover method applied to the first network device provided in the embodiments of the present invention can be understood as being executed by the first cell corresponding to the first network device. The steps executed by the second network device can also be understood as being executed by the second cell corresponding to the second network device.

[0084] Wherein, the second network device can also be referred to as a source base station, the second cell is referred to as a source cell, the first network device can also be referred to as a target base station, and the first cell is referred to as a target cell.

[0085] In this step, the source cell sends a handover request to the target cell. The handover request is used to request a terminal in the source cell to access the target cell, and the location information sent by the terminal is carried in the handover request. The target cell receives the handover request.

[0086] Wherein, the location information of the terminal includes at least one of the following: longitude of the terminal, latitude of the terminal, and altitude of the terminal.

[0087] Moreover, before this step, the terminal receives the measurement and control information sent by the source cell, obtains the first SSB index of the measured third cell, and reports the first SSB index of the measured third cell to the source cell in the measurement report.

[0088] In this step, the source cell sends the first SSB index of the third cell to the target cell in the above-mentioned handover request.

[0089] Step 102: When it is determined according to the location information that the terminal is located within the beam coverage range corresponding to the second SSB index of the first cell and the first SSB index of the third cell matches the second SSB index of the first cell, send a handover response message to the second network device;

[0090] The handover response message is used to indicate that the first network device allows the terminal to be handed over to the first cell.

[0091] The handover response message includes PDSCH resource information.

[0092] In this step, the target cell determines, based on the location information of the terminal, whether the terminal is within the beam coverage range corresponding to the second SSB index of the first cell. If it is determined that the terminal is within the beam coverage range corresponding to the second SSB index of the first cell, then it is determined whether the first SSB index of the third cell measured by the terminal matches (or is confused with) the second SSB index of the first cell. If they match (i.e., no confusion occurs), a handover response message is sent to the second network device, indicating that the terminal is allowed to access the first cell to perform a normal handover process. The source cell receives this handover response message.

[0093] Among them, determining that the terminal is within the beam coverage range corresponding to the second SSB index of the first cell according to the location information specifically includes: the target cell determines, based on the location information of the terminal, whether the terminal is within the coverage range of the target cell. If it is determined that the terminal is within the coverage range of the target cell, then based on the location information of the terminal, it is determined or estimated that the terminal is within the beam coverage range of the second SSB index of the target cell.

[0094] In the embodiment of the present invention, the second SSB index of the first cell where the terminal is located is estimated through the location information of the terminal, ensuring that the first SSB index of the third cell measured by the terminal and the second SSB index of the first cell of the terminal are used for subsequent handover processes, ensuring that the beam directions of the terminal and the target base station match, and avoiding the problem of handover failure caused by the mismatch between the beam directions of the terminal and the target base station.

[0095] Among them, the method further includes:

[0096] In the case where the physical cell identifier (PCI) of the third cell is the same as that of the first cell, and the first SSB index and the second SSB index are the same, it is determined that the first SSB index of the third cell does not match the second SSB index of the first cell, that is, the first SSB index of the third cell is confused with the second SSB index of the first cell, or there is a problem of beam misalignment in the target cell.

[0097] In an alternative embodiment, the method further includes:

[0098] When it is determined according to the location information that the terminal is located within the beam coverage range corresponding to the second SSB index of the first cell, and the first SSB index of the third cell does not match the second SSB index of the first cell, a random access response MSG2 is sent to the terminal in all beam directions of the first cell. That is, when the target cell determines that the location information of the terminal is within the beam coverage range corresponding to the second SSB index of the first cell, but the PCI of the third cell is different from that of the first cell, resulting in SSB index confusion, the random access response MSG2 is sent in the omni-directional direction of the beam (i.e., all beam directions) so that the terminal can receive MSG2. Or it can be understood that in the form of beam bundling, MSG2 is sent in all beam directions within a PDSCH resource.

[0099] The terminal sends a Radio link Control (RRC) reconfiguration complete message to the target cell to synchronize with the target cell.

[0100] The target cell receives the RRC reconfiguration complete message sent by the terminal, and the RRC reconfiguration complete message includes the SSB index of the beam on which the terminal receives the random access response MSG2.

[0101] In another optional embodiment, the method further includes:

[0102] When it is determined according to the location information that the terminal is located within the beam coverage range corresponding to the second SSB index of the first cell, and the first SSB index of the third cell does not match the second SSB index of the first cell, the first data information is sequentially sent at the physical downlink shared channel PDSCH resource positions corresponding to each beam of the first cell. The first data information includes a random access response MSG2 and the SSB index corresponding to the beam. That is, when the target cell determines that the location information of the terminal is within the beam coverage range corresponding to the second SSB index of the first cell, but the PCI of the third cell is different from that of the first cell, resulting in SSB index confusion, Beam bundling PDSCH is sent, and on a continuous logical resource, the PDSCH data corresponding to each beam (i.e., the first data information) is sent sequentially or in a round-robin manner. For example, if there are 7 beams, 7 copies of PDSCH data are sent sequentially or in a round-robin manner. The first data information includes MSG2 and the SSB index corresponding to the beam on which the first data information is sent. It can be understood that in the first data information for reconfiguring the downlink, the new information indicates or represents the SSB Index corresponding to the transmission beam.

[0103] The terminal receives the full amount of the first data information. The first data information transmitted by the beam corresponding to the terminal direction can be correctly received and demodulated by the terminal, while the first data information in other beam directions will be discarded by the terminal.

[0104] The terminal sends an RRC reconfiguration complete message to the target cell, and the target cell receives the RRC reconfiguration complete message sent by the terminal. The RRC reconfiguration complete message includes the SSB index of the first beam in the first cell, where the first beam is the beam through which the terminal receives the first data information, and both parties reach an agreement.

[0105] Wherein, before transmitting the first data information on the physical downlink shared channel (PDSCH) resource positions corresponding to each beam of the first cell in sequence, the method further includes:

[0106] Sending a first indication information to the second network device, where the first indication information is used to indicate the PDSCH resource positions corresponding to each beam of the first cell.

[0107] That is, in the case where the target cell determines that the location information of the terminal is within the beam coverage range corresponding to the second SSB index of the first cell, but the physical cell identifier (PCI) of the third cell is different from that of the first cell, resulting in SSB index confusion. After the target cell normally resumes the handover response information to the source cell, a first indication information (this PDCCH indication) is sent to the source cell to indicate the position of the PDSCH resource.

[0108] Wherein, the precoding matrix indication (PMI) applicable to the first data information corresponding to different beams in the first cell is different, and respectively corresponds to the beamforming array of the SSB corresponding to the beam transmitting the first data information.

[0109] In an alternative embodiment, the method further includes:

[0110] Sending a second indication information to the second network device, where the second indication information is used to indicate that the first SSB index of the third cell does not match the second SSB index of the first cell, and / or indicating that the second network device switches the terminal to the fourth cell corresponding to the third network device.

[0111] That is, in this alternative embodiment, in the case where the target cell determines that the location information of the terminal is within the beam coverage range corresponding to the second SSB index of the first cell, but the PCI of the third cell is different from that of the first cell, resulting in SSB index confusion, a second indication information is sent to the source cell, and the second indication information is used to indicate the beam misalignment of the target cell, and / or indicating that the source cell replaces the target cell with another cell.

[0112] In an optional embodiment, the method further includes:

[0113] When the terminal is not within the coverage area of the first cell, sending third indication information to the second network device, where the third indication information is used to indicate that the terminal is not within the coverage area of the first cell.

[0114] That is, in this optional embodiment, the target cell determines whether the terminal is within the coverage area of the target cell according to the location information of the terminal. If the terminal is not within the coverage area of the target cell, it is determined that there is an over-coverage problem in the target cell, and third indication information is sent to the source cell. Optionally, the third indication information may be carried in the handover response information. The third indication information is used to indicate that there is an over-coverage problem in the target cell. The source cell replaces another cell as the target cell according to the third indication information.

[0115] The following combines Figure 2 to specifically illustrate the specific process of the cell handover method provided by the embodiments of the present invention:

[0116] The terminal receives the measurement and control information of the source cell; the terminal measures the first SSB index of the third cell (the cell reported by the terminal) according to the measurement and control information, and reports the first SSB index of the third cell and the location information of the terminal to the source cell; the source cell sends a handover request to the target cell, and the handover request includes the location information of the terminal and the first SSB index of the third cell; the target cell determines whether the SSB index is correct according to the location information of the terminal, that is, the target cell estimates that the terminal is within the beam coverage range of the second SSB index in the first cell according to the location information of the terminal, and determines whether the first SSB index of the third cell matches the second SSB index of the first cell. If they do not match, it is decided to send MSG2 omnidirectionally or poll to send MSG2; the source cell sends configuration information to the terminal; the terminal carries the received PDSCH location in the RRC reconfiguration complete message; the target cell sends MSG2 omnidirectionally or polls to send MSG2 to the terminal; the source cell carries the received PDSCH resource information in the new RRC reconfiguration complete; the target cell sends MSG2 omnidirectionally or polls to send MSG2 to the terminal to obtain the position of the beam of the correct SBB index where the terminal is located, and starts communicating with the target cell.

[0117] In summary, in the embodiments of the present invention, to solve the problem of SSB index confusion caused by PCI confusion of cells in the low-altitude scenario, the terminal reports the location information and the first SSB index of the measured third cell, and the target cell estimates the second SSB index of the terminal in the first cell according to the location information of the terminal. According to the first SSB index of the third cell and the second SSB index of the first cell, MSG2 is sent omnidirectionally or MSG2 is sent in a polling manner by using the beam bundling method, and the position of the beam of the correct SBB index where the terminal is located is obtained in the reconfiguration complete message, and the SSB index is confirmed bidirectionally, so that the user can correctly access the cell and correct the SSB index, and the handover failure problem caused by the mismatch between the direction of the terminal and the target base station is solved.

[0118] As Figure 3 shown, the embodiments of the present invention further provide a cell handover method, which is applied to a second network device, and the method includes:

[0119] Step 301: Send a handover request to a first network device, where the handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device; wherein, the handover request includes the location information of the terminal and the first SSB index of the third cell measured by the terminal.

[0120] It should be noted that the cell handover method provided in the embodiments of the present invention applied to the second network device can be understood as being executed by the second cell corresponding to the second network device. The steps executed by the first network device can also be understood as being executed by the first cell corresponding to the first network device.

[0121] Among them, the second network device can also be called a source base station, the second cell is called a source cell, the first network device can also be called a target base station, and the first cell is called a target cell.

[0122] In this step, the source cell sends a handover request to the target cell, and the handover request is used to request a terminal in the source cell to access the target cell, and the location information sent by the terminal is carried in the handover request. The target cell receives the handover request.

[0123] Wherein, the location information of the terminal includes at least one of the following: the longitude of the terminal, the latitude of the terminal, and the altitude of the terminal.

[0124] In this step, the source cell sends the first SSB index of the third cell to the target cell in the above handover request.

[0125] Step 302: Receive a handover response message sent by the first network device, where the handover response message is used to indicate that the first network device allows the terminal to be handed over to the first cell.

[0126] The handover response message includes PDSCH resource information.

[0127] In this step, the target cell determines, according to the location information of the terminal, whether the terminal is within the beam coverage range corresponding to the second SSB index of the first cell. If it is determined that the terminal is within the beam coverage range corresponding to the second SSB index of the first cell, then it is determined whether the first SSB index of the third cell measured by the terminal matches (or is confused with) the second SSB index of the first cell. If they match (i.e., no confusion occurs), a handover response message is sent to the second network device, indicating that the terminal is allowed to access the first cell to perform a normal handover process. The source cell receives this handover response message.

[0128] In an optional embodiment, before sending a handover request to the first network device, the method further includes:

[0129] Receiving the location information of the terminal sent by the terminal and the first SSB index of the third cell measured by the terminal.

[0130] That is, in this optional embodiment, the terminal receives the measurement and control information sent by the source cell to obtain the first SSB index of the third cell measured. In the measurement report, the terminal reports the first SSB index of the third cell measured to the source cell, and the source cell receives the first SSB index of the third cell.

[0131] In addition, the terminal sends the location information of the terminal to the source cell, and the source cell receives the location information of the terminal reported by the terminal.

[0132] In an optional embodiment, the method further includes:

[0133] Receiving the second indication information sent by the first network device, where the second indication information is used to indicate that the first SSB index of the third cell does not match the second SSB index of the first cell, and / or to indicate that the second network device switches the terminal to the fourth cell corresponding to the third network device.

[0134] That is, in this optional embodiment, when it is determined in the target cell that the location information of the terminal is within the beam coverage range corresponding to the second SSB index of the first cell, but the PCI of the third cell is different from that of the first cell, resulting in SSB index confusion, the second indication information is sent to the source cell. The second indication information is used to indicate the beam misalignment of the target cell, and / or to indicate that the source cell replaces the target cell with another cell.

[0135] The source cell receives the second indication information and can replace the target cell with another cell according to the second indication information.

[0136] In an optional embodiment, the method further includes:

[0137] Receiving third indication information sent by the first network device, where the third indication information is used to indicate that the terminal is not within the coverage area of the first cell.

[0138] That is, in this optional embodiment, the target cell determines whether the terminal is within the coverage area of the target cell according to the location information of the terminal. If the terminal is not within the coverage area of the target cell, it is determined that there is an out-of-cell coverage problem in the target cell, and third indication information is sent to the source cell. Optionally, the third indication information may be carried in the handover response message. The third indication information is used to indicate that there is an out-of-cell coverage problem in the target cell. The source cell replaces another cell as the target cell according to the third indication information.

[0139] The source cell receives the third indication information and may select to replace another cell as the target cell according to the third indication information.

[0140] It should be noted that all embodiments of the cell handover method applied to the second network device provided in the embodiments of the present invention are applicable to all embodiments of the cell handover method applied to the first network device described above, and can achieve the same or similar technical effects.

[0141] As Figure 4 shown, an embodiment of the present invention further provides a cell handover method applied to a terminal. The method includes:

[0142] Step 401: Sending the location information of the terminal and the first SSB index of the third cell measured by the terminal to the second network device;

[0143] Wherein, the second network device is used to send a handover request to the first network device and receive a handover response message sent by the first network device;

[0144] Wherein, the handover request is used to request the terminal in the second cell corresponding to the second network device to access the first cell corresponding to the first network device; the handover request includes the location information of the terminal and the first SSB index of the third cell measured by the terminal; the handover response message is used to indicate that the first network device allows the terminal to be handed over to the first cell.

[0145] It should be noted that in the embodiments of the present invention, the steps executed by the second network device may also be understood as being executed by the second cell corresponding to the second network device.

[0146] Wherein, the second network device may also be referred to as a source base station, and the second cell is referred to as a source cell.

[0147] In this step, the terminal receives the measurement and control information sent by the source cell, obtains the first SSB index of the measured third cell, and in the measurement report, the terminal reports the first SSB index of the measured third cell to the source cell.

[0148] In addition, the terminal reports the location information of the terminal to the source cell.

[0149] In an optional embodiment, the method further includes:

[0150] Receiving a random access response MSG2 sent by the first network device in all beam directions corresponding to the first cell of the first network device;

[0151] Sending an RRC reconfiguration complete message to the first network device, where the RRC reconfiguration complete message includes the SSB index of the beam on which the terminal receives the random access response MSG2.

[0152] That is, when it is determined in the target cell that the location information of the terminal is within the beam coverage range corresponding to the second SSB index of the first cell, but the PCI of the third cell is different from that of the first cell, resulting in SSB index confusion, the random access response MSG2 is sent in the omnidirectional direction of the beam (i.e., all beam directions) so that the terminal can receive the MSG2. Or it can be understood that in the beam bundling method, the MSG2 is sent in all beam directions within one PDSCH resource.

[0153] The terminal receives the MSG2, sends a Radio link Control (RRC) reconfiguration complete message to the target cell, and synchronizes with the target cell. Wherein, the RRC reconfiguration complete message includes the SSB index of the beam on which the terminal receives the random access response MSG2.

[0154] In another optional embodiment, the method further includes:

[0155] Receiving first data information at the PDSCH resource position corresponding to each beam direction of the first cell of the first network device, where the first data information includes a random access response MSG2 and the SSB index corresponding to the beam;

[0156] Sending an RRC reconfiguration complete message to the first network device, where the RRC reconfiguration complete message includes the SSB index of the first beam in the first cell, where the first beam is the beam on which the terminal receives the first data information.

[0157] That is, when it is determined in the target cell that the location information of the terminal is within the beam coverage range corresponding to the second SSB index of the first cell, but the physical cell identifier (PCI) of the third cell is different from that of the first cell, resulting in SSB index confusion, a Beam bundling physical downlink shared channel (PDSCH) is sent. On a continuous logical resource, the PDSCH data (i.e., the first data information) corresponding to each beam is sent sequentially or in a round-robin manner. For example, if there are 7 beams, 7 pieces of PDSCH data are sent sequentially or in a round-robin manner. The first data information includes message 2 (MSG2) and the SSB index corresponding to the beam that sends the first data information. It can be understood that in the reconfigured downlink first data information, the new information indicates or represents the SSB Index corresponding to the sending beam.

[0158] The terminal receives the full amount of the first data information. The first data information sent by the beam corresponding to the terminal direction will be correctly received and demodulated by the terminal, and the first data information in other beam directions will be discarded by the terminal.

[0159] The terminal sends a radio resource control (RRC) reconfiguration complete message to the target cell. The target cell receives the RRC reconfiguration complete message sent by the terminal. The RRC reconfiguration complete message includes the SSB index of the first beam in the first cell, where the first beam is the beam through which the terminal receives the first data information, and the two parties reach an agreement.

[0160] Among them, the precoding matrix indicator (PMI) applicable to the first data information corresponding to different beams in the first cell is different, and respectively corresponds to the beamforming array of the SSB corresponding to the beam that sends the first data information.

[0161] It should be noted that all embodiments of the cell handover method applied to the terminal provided in the embodiments of the present invention are applicable to all embodiments of the above-mentioned cell handover method applied to the first network device or the second network device, and can achieve the same or similar technical effects.

[0162] As Figure 5 shown, the embodiments of the present invention further provide a cell handover device, and the device includes:

[0163] A first receiving module 501, configured to receive a handover request sent by a second network device, where the handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to a first network device; wherein, the handover request includes the location information of the terminal and the first synchronization signal block / physical broadcast channel block (SSB) index of a third cell measured by the terminal.

[0164] A first transmission module 502, configured to send a handover response message to the second network device when it is determined according to the location information that the terminal is within the beam coverage range corresponding to the second SSB index of the first cell and the first SSB index of the third cell matches the second SSB index of the first cell; the handover response message is used to indicate that the first network device allows the terminal to hand over to the first cell.

[0165] Optionally, the apparatus further includes:

[0166] A first information transmission module, configured to send a random access response MSG2 to the terminal in all beam directions of the first cell when it is determined according to the location information that the terminal is within the beam coverage range corresponding to the second SSB index of the first cell and the first SSB index of the third cell does not match the second SSB index of the first cell;

[0167] A first information reception module, configured to receive a radio resource control (RRC) reconfiguration complete message sent by the terminal, where the RRC reconfiguration complete message includes the SSB index of the beam on which the terminal receives the random access response MSG2.

[0168] Optionally, the apparatus further includes:

[0169] A second information transmission module, configured to sequentially send first data information on the physical downlink shared channel (PDSCH) resource positions corresponding to each beam of the first cell when it is determined according to the location information that the terminal is within the beam coverage range corresponding to the second SSB index of the first cell and the first SSB index of the third cell does not match the second SSB index of the first cell, where the first data information includes a random access response MSG2 and the SSB index corresponding to the beam;

[0170] A second information reception module, configured to receive an RRC reconfiguration complete message sent by the terminal, where the RRC reconfiguration complete message includes the SSB index of a first beam in the first cell, and the first beam is the beam on which the terminal receives the first data information.

[0171] Optionally, the apparatus further includes:

[0172] A third information transmission module, configured to send first indication information to the second network device, where the first indication information is used to indicate the PDSCH resource positions corresponding to each beam of the first cell.

[0173] Optionally, the precoding matrix indicator (PMI) applicable to the first data information corresponding to different beams in the first cell is different.

[0174] Optionally, the apparatus further comprises:

[0175] A first processing module, configured to determine that the first SSB index of the third cell does not match the second SSB index of the first cell when the physical cell identifier (PCI) of the third cell is the same as the PCI of the first cell, and the first SSB index and the second SSB index are the same.

[0176] Optionally, the apparatus further comprises:

[0177] A fourth information sending module, configured to send second indication information to the second network device, where the second indication information is used to indicate that the first SSB index of the third cell does not match the second SSB index of the first cell, and / or to indicate that the second network device switches the terminal to a fourth cell corresponding to a third network device.

[0178] Optionally, the apparatus further comprises:

[0179] A fifth information sending module, configured to send third indication information to the second network device when the terminal is not within the coverage area of the first cell, where the third indication information is used to indicate that the terminal is not within the coverage area of the first cell.

[0180] It should be noted that the cell switching apparatus provided in the embodiments of the present invention is an apparatus capable of executing the above-mentioned cell switching method applied to a first network device. All the embodiments of the above-mentioned cell switching method applied to the first network device are applicable to this apparatus and can achieve the same or similar technical effects.

[0181] As Figure 6 shown, the embodiments of the present invention further provide a cell switching apparatus, and the apparatus comprises:

[0182] A second sending module 601, configured to send a handover request to a first network device, where the handover request is used to request a terminal in a second cell corresponding to a second network device to access a first cell corresponding to the first network device; wherein, the handover request includes location information of the terminal and a first SSB index of a third cell measured by the terminal.

[0183] A second receiving module 602, configured to receive a handover response message sent by the first network device, where the handover response message is used to indicate that the first network device allows the terminal to be handed over to the first cell.

[0184] Optionally, the apparatus further comprises:

[0185] A third information receiving module, configured to receive the location information of the terminal and the first SSB index of a third cell measured by the terminal sent by the terminal.

[0186] Optionally, the device further includes:

[0187] A fourth information receiving module, configured to receive second indication information sent by the first network device, where the second indication information is used to indicate that the first SSB index of the third cell does not match the second SSB index of the first cell, and / or indicate that the second network device switches the terminal to a fourth cell corresponding to a third network device.

[0188] Optionally, the method further includes:

[0189] A fifth information receiving module, configured to receive third indication information sent by the first network device, where the third indication information is used to indicate that the terminal is not within the coverage area of the first cell.

[0190] It should be noted that the cell switching device provided in the embodiments of the present invention is a device capable of executing the above-mentioned cell switching method applied to a second network device. All embodiments of the above-mentioned cell switching method applied to a second network device are applicable to this device and can achieve the same or similar technical effects.

[0191] As Figure 7 shown, an embodiment of the present invention further provides a cell switching device, and the device includes:

[0192] A third sending module 701, configured to send the location information of the terminal and the first SSB index of a third cell measured by the terminal to a second network device;

[0193] Wherein, the second network device is configured to send a handover request to a first network device and receive a handover response message sent by the first network device;

[0194] Wherein, the handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device; the handover request includes the location information of the terminal and the first SSB index of the third cell measured by the terminal; the handover response message is used to indicate that the first network device allows the terminal to be switched to the first cell.

[0195] Optionally, the device further includes:

[0196] A sixth information receiving module, configured to receive a random access response MSG2 sent by the first network device in all beam directions of a first cell corresponding to the first network device;

[0197] A sixth information sending module, configured to send an RRC reconfiguration complete message to the first network device, where the RRC reconfiguration complete message includes the SSB index of the beam on which the terminal receives the random access response MSG2.

[0198] Optionally, the apparatus further includes:

[0199] A seventh information receiving module, configured to receive first data information on the PDSCH resource positions corresponding to each beam direction of a first cell of a first network device, where the first data information includes a random access response MSG2 and the SSB index corresponding to the beam;

[0200] A seventh information sending module, configured to send an RRC reconfiguration complete message to the first network device, where the RRC reconfiguration complete message includes the SSB index of a first beam in the first cell, where the first beam is the beam on which the terminal receives the first data information.

[0201] Optionally, precoding matrix indicators (PMIs) applicable to the first data information corresponding to different beams in the first cell are different.

[0202] It should be noted that the cell switching apparatus provided in the embodiments of the present invention is an apparatus capable of executing the above cell switching method applied to a terminal. All embodiments of the above cell switching method applied to a terminal are applicable to this apparatus and can achieve the same or similar technical effects.

[0203] As Figure 8 shown, an embodiment of the present invention further provides a network device. The network device is a first network device and includes: a processor 801; and a memory 803 connected to the processor 801 through a bus interface 802. The memory 803 is configured to store programs and data used by the processor 801 when performing operations. The processor 801 calls and executes the programs and data stored in the memory 803.

[0204] Wherein, a transceiver 804 is connected to the bus interface 802 and is configured to receive and send data under the control of the processor 801. Specifically, the processor 801 is configured to read programs in the memory 803, and the transceiver 804 is configured to perform the following processes:

[0205] Receive a handover request sent by a second network device, where the handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device; where the handover request includes location information of the terminal and the SSB index of a first synchronization signal block / physical broadcast channel block (SSB) of a third cell measured by the terminal;

[0206] When it is determined according to the location information that the terminal is located within the beam coverage range corresponding to the second SSB index of the first cell, and the first SSB index of the third cell matches the second SSB index of the first cell, a handover response message is sent to the second network device; the handover response message is used to instruct the first network device to allow the terminal to hand over to the first cell.

[0207] Optionally, the transceiver 804 is further configured to:

[0208] When it is determined according to the location information that the terminal is located within the beam coverage range corresponding to the second SSB index of the first cell, and the first SSB index of the third cell does not match the second SSB index of the first cell, a random access response MSG2 is sent to the terminal in all beam directions of the first cell;

[0209] Receive a radio resource control (RRC) reconfiguration complete message sent by the terminal, where the RRC reconfiguration complete message includes the SSB index of the beam on which the terminal receives the random access response MSG2.

[0210] Optionally, the transceiver 804 is further configured to:

[0211] When it is determined according to the location information that the terminal is located within the beam coverage range corresponding to the second SSB index of the first cell, and the first SSB index of the third cell does not match the second SSB index of the first cell, first data information is sequentially sent on the physical downlink shared channel (PDSCH) resource positions corresponding to each beam of the first cell, where the first data information includes a random access response MSG2 and the SSB index corresponding to the beam;

[0212] Receive an RRC reconfiguration complete message sent by the terminal, where the RRC reconfiguration complete message includes the SSB index of the first beam in the first cell, where the first beam is the beam on which the terminal receives the first data information.

[0213] Optionally, the transceiver 804 is further configured to:

[0214] Send first indication information to the second network device, where the first indication information is used to indicate the PDSCH resource positions corresponding to each beam of the first cell.

[0215] Optionally, the precoding matrix indicator (PMI) applicable to the first data information corresponding to different beams in the first cell is different.

[0216] Optionally, the processor 801 is configured to:

[0217] When the physical cell identifier (PCI) of the third cell is the same as that of the first cell, and the first SSB index is the same as the second SSB index, it is determined that the first SSB index of the third cell does not match the second SSB index of the first cell.

[0218] Optionally, the transceiver 804 is further configured to:

[0219] Send second indication information to the second network device, where the second indication information is used to indicate that the first SSB index of the third cell does not match the second SSB index of the first cell, and / or to indicate that the second network device switches the terminal to the fourth cell corresponding to the third network device.

[0220] Optionally, the transceiver 804 is further configured to:

[0221] When the terminal is not within the coverage area of the first cell, send third indication information to the second network device, where the third indication information is used to indicate that the terminal is not within the coverage area of the first cell.

[0222] Wherein, in Figure 8 , the bus architecture may include any number of interconnected buses and bridges, specifically, various circuits represented by one or more processors represented by the processor 801 and a memory represented by the memory 803 are linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art, and thus will not be further described herein. The bus interface provides an interface. The transceiver 804 may be multiple components, that is, including a transmitter and a receiver, and provides a unit for communicating with various other devices on the transmission medium. The processor 801 is responsible for managing the bus architecture and general processing, and the memory 803 may store data used by the processor 801 when performing operations.

[0223] An embodiment of the present invention further provides a network device, where the network device is a second network device, including: a processor; and a memory connected to the processor through a bus interface, where the memory is used to store programs and data used by the processor when performing operations, and the processor calls and executes the programs and data stored in the memory.

[0224] Wherein, the transceiver is connected to the bus interface and is configured to receive and send data under the control of the processor.

[0225] It should be noted that the structure of the second network device is basically the same as that of the first network device shown in Figure 8 and will not be elaborated herein.

[0226] Specifically, the processor is configured to read the program in the memory, and the transceiver is configured to perform the following procedures:

[0227] Send a handover request to a first network device, where the handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device; wherein, the handover request includes location information of the terminal and a first SSB index of a third cell measured by the terminal.

[0228] Receive a handover response message sent by the first network device, where the handover response message is used to indicate that the first network device allows the terminal to be handed over to the first cell.

[0229] Optionally, the transceiver is further configured to:

[0230] Receive the location information of the terminal and the first SSB index of the third cell measured by the terminal sent by the terminal.

[0231] Optionally, the transceiver is further configured to:

[0232] Receive second indication information sent by the first network device, where the second indication information is used to indicate that the first SSB index of the third cell does not match the second SSB index of the first cell, and / or to indicate that the second network device hands over the terminal to a fourth cell corresponding to a third network device.

[0233] Optionally, the transceiver is further configured to:

[0234] Receive third indication information sent by the first network device, where the third indication information is used to indicate that the terminal is not within the coverage area of the first cell.

[0235] As Figure 9 shown, an embodiment of the present invention further provides a terminal, including: a processor 901; and a memory 903 connected to the processor 901 through a bus interface 902, where the memory 903 is configured to store programs and data used by the processor 901 when performing operations, and the processor 901 calls and executes the programs and data stored in the memory 903.

[0236] Wherein, the transceiver 904 is connected to the bus interface 902 and is configured to receive and send data under the control of the processor 901. Specifically, the processor 901 is configured to read the program in the memory 903, and the transceiver 904 is configured to perform the following procedures:

[0237] Send the location information of the terminal and the first SSB index of the third cell measured by the terminal to the second network device.

[0238] Among them, the second network device is used to send a handover request to the first network device and receive a handover response message sent by the first network device;

[0239] Among them, the handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device; the handover request includes location information of the terminal and a first SSB index of a third cell measured by the terminal; the handover response message is used to indicate that the first network device allows the terminal to be handed over to the first cell.

[0240] Optionally, the transceiver 904 is further configured to:

[0241] Receive a random access response MSG2 sent by the first network device in all beam directions of a first cell corresponding to the first network device;

[0242] Send an RRC reconfiguration complete message to the first network device, where the RRC reconfiguration complete message includes an SSB index of a beam on which the terminal receives the random access response MSG2.

[0243] Optionally, the transceiver 904 is further configured to:

[0244] Receive first data information at a PDSCH resource position corresponding to each beam direction of a first cell corresponding to the first network device, where the first data information includes a random access response MSG2 and an SSB index corresponding to the beam;

[0245] Send an RRC reconfiguration complete message to the first network device, where the RRC reconfiguration complete message includes an SSB index of a first beam in the first cell, where the first beam is the beam on which the terminal receives the first data information.

[0246] Optionally, precoding matrix indicators PMI applicable to the first data information corresponding to different beams in the first cell are different.

[0247] Among them, in Figure 9Among them, the bus architecture may include any number of interconnected buses and bridges, specifically, various circuits represented by one or more processors represented by the processor 901 and the memory represented by the memory 903 are linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art, and thus will not be further described herein. The bus interface provides a user interface 905. The transceiver 904 may be multiple components, that is, including a transmitter and a receiver, and provides a unit for communicating with various other devices on the transmission medium. The processor 901 is responsible for managing the bus architecture and general processing, and the memory 903 may store data used by the processor 901 when performing operations.

[0248] In addition, a specific embodiment of the present invention further provides a readable storage medium, on which a computer program is stored. Among them, when the program is executed by a processor, it implements the steps in the cell handover method applied to the first network device described in any one of the above, or implements the steps in the cell handover method applied to the second network device described in any one of the above, or implements the steps in the cell handover method applied to the terminal described in any one of the above.

[0249] In several embodiments provided in the present application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other may be through some interfaces, and the indirect couplings or communication connections of the devices or units may be in electrical, mechanical or other forms.

[0250] In addition, in each embodiment of the present invention, the functional units may be integrated in a processing unit, or each unit may be physically included separately, or two or more units may be integrated in one unit. The above integrated unit may be implemented in the form of hardware, or in the form of a combination of hardware and software functional units.

[0251] The integrated unit implemented in the form of software functional units can be stored in a computer-readable storage medium. The above-mentioned software functional units are stored in a storage medium, including a number of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute some steps of the resource selection method described in various embodiments of the present invention, or to execute some steps of the information sending method described in various embodiments of the present invention. The foregoing storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks, or optical discs.

[0252] Specific embodiments of the present invention further provide a computer program product, including computer instructions, which when executed by a processor, implement the various processes of the method embodiments as described above Figure 1 or Figure 3 or Figure 4 shown in the method embodiments, and can achieve the same technical effects. To avoid repetition, they will not be elaborated here.

[0253] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements can be made without departing from the principles described in the present invention, and these improvements and refinements are also within the protection scope of the present invention.

Claims

1. A cell switching method, characterized in that: Applied to a first network device, the method comprises: receiving a handover request sent by a second network device, the handover request being used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device; wherein the handover request includes location information of the terminal and a first synchronization signal block / physical broadcast channel block SSB index of a third cell measured by the terminal; When it is determined according to the location information that the terminal is located in the beam coverage corresponding to the second SSB index of the first cell, and the first SSB index of the third cell matches the second SSB index of the first cell, sending a handover response message to the second network device; the handover response message is used to indicate that the first network device allows the terminal to be handed over to the first cell; Wherein, the method further comprises: When it is determined according to the location information that the terminal is located in the beam coverage corresponding to the second SSB index of the first cell, and the first SSB index of the third cell does not match the second SSB index of the first cell, sending a random access response MSG2 to the terminal in all beam directions of the first cell; Receive a radio link control RRC reconfiguration completion message sent by the terminal, where the RRC reconfiguration completion message includes the SSB index of the beam of the random access response MSG2 received by the terminal.

2. The method according to claim 1, characterized in that: The method further comprises: When it is determined according to the location information that the terminal is located in the beam coverage corresponding to the second SSB index of the first cell, and the first SSB index of the third cell does not match the second SSB index of the first cell, first data information is sent in sequence at the physical downlink shared channel PDSCH resource position corresponding to each beam of the first cell, where the first data information includes a random access response MSG2 and the SSB index corresponding to the beam; Receive an RRC reconfiguration completion message sent by the terminal, where the RRC reconfiguration completion message includes an SSB index of a first beam in a first cell, wherein the first beam is a beam through which the terminal receives the first data information.

3. The method according to claim 2, characterized in that The method further comprises: Send first indication information to the second network device, where the first indication information is used to indicate a PDSCH resource position corresponding to each beam of the first cell.

4. The method according to claim 2, characterized in that: The first data information corresponding to different beams in the first cell is applicable to different precoding matrix indications PMIs.

5. The method according to any one of claims 1 to 2, characterized in that The method further comprises: When the physical cell identifier PCI of the third cell is the same as the PCI of the first cell, and the first SSB index is the same as the second SSB index, it is determined that the first SSB index of the third cell does not match the second SSB index of the first cell.

6. The method according to claim 1, characterized in that The method further comprises: Sending second indication information to the second network device, the second indication information is used to indicate that the first SSB index of the third cell does not match the second SSB index of the first cell, and / or instructing the second network device to switch the terminal to a fourth cell corresponding to the third network device.

7. The method according to claim 1, characterized in that The method further comprises: When the terminal is not located within the coverage of the first cell, third indication information is sent to the second network device, where the third indication information is used to indicate that the terminal is not located within the coverage of the first cell.

8. A cell switching method, characterized in that: Applied to the second network device, the method comprises: Sending a handover request to the first network device, the handover request being used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device; wherein the handover request includes location information of the terminal and a first SSB index of a third cell measured by the terminal; receiving a handover response message sent by the first network device, where the handover response message is used to indicate that the first network device allows the terminal to be handed over to the first cell; The handover response message is sent by the first network device to the second network device when the first network device determines, according to the location information, that the terminal is located in the beam coverage range corresponding to the second SSB index of the first cell, and the first SSB index of the third cell matches the second SSB index of the first cell; The first network device is also used to send a random access response MSG2 to the terminal in all beam directions of the first cell when it is determined based on the location information that the terminal is located in the beam coverage range corresponding to the second SSB index of the first cell, and the first SSB index of the third cell does not match the second SSB index of the first cell; and receive a radio link control RRC reconfiguration completion message sent by the terminal, the RRC reconfiguration completion message including the SSB index of the beam in which the terminal receives the random access response MSG2.

9. The method according to claim 8, characterized in that The method further comprises: Receive the location information of the terminal sent by the terminal and the first SSB index of the third cell measured by the terminal.

10. The method according to claim 8, characterized in that The method further comprises: Receive second indication information sent by the first network device, where the second indication information is used to indicate that the first SSB index of the third cell does not match the second SSB index of the first cell, and / or to instruct the second network device to switch the terminal to a fourth cell corresponding to the third network device.

11. The method according to claim 8, characterized in that The method further comprises: Receive third indication information sent by the first network device, where the third indication information is used to indicate that the terminal is not located within the coverage of the first cell.

12. A cell switching method, characterized in that: Applied to a terminal, the method comprises: Sending the location information of the terminal and a first SSB index of a third cell measured by the terminal to the second network device; The second network device is used to send a switching request to the first network device, and receive a switching response message sent by the first network device; The handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device; the handover request includes location information of the terminal and a first SSB index of a third cell measured by the terminal; and the handover response message is used to indicate that the first network device allows the terminal to be handed over to the first cell; Wherein, the method further comprises: receiving a random access response MSG2 sent by a first network device in all beam directions of a first cell corresponding to the first network device; An RRC reconfiguration completion message is sent to the first network device, wherein the RRC reconfiguration completion message includes the SSB index of the beam of the random access response MSG2 received by the terminal.

13. The method according to claim 12, characterized in that The method further comprises: Receive first data information at a PDSCH resource position corresponding to each beam direction of a first cell corresponding to the first network device, where the first data information includes a random access response MSG2 and an SSB index corresponding to the beam; An RRC reconfiguration completion message is sent to the first network device, wherein the RRC reconfiguration completion message includes an SSB index of a first beam in a first cell, wherein the first beam is the beam through which the terminal receives the first data information.

14. The method according to claim 13, characterized in that The first data information corresponding to different beams in the first cell is applicable to different precoding matrix indications PMIs.

15. A cell switching device, characterized in that: The device comprises: A first receiving module is configured to receive a handover request sent by a second network device, wherein the handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device; wherein the handover request includes location information of the terminal and a first synchronization signal block / physical broadcast channel block SSB index of a third cell measured by the terminal; A first sending module is configured to send a switching response message to the second network device when it is determined that the terminal is located in a beam coverage range corresponding to the second SSB index of the first cell according to the location information, and the first SSB index of the third cell matches the second SSB index of the first cell; the switching response message is used to indicate that the first network device allows the terminal to be switched to the first cell; Wherein, the device further comprises: A first information sending module, configured to send a random access response MSG2 to the terminal in all beam directions of the first cell when it is determined that the terminal is located in a beam coverage range corresponding to the second SSB index of the first cell according to the location information, and the first SSB index of the third cell does not match the second SSB index of the first cell; The first information receiving module is used to receive a radio link control RRC reconfiguration completion message sent by the terminal, wherein the RRC reconfiguration completion message includes an SSB index of a beam of the random access response MSG2 received by the terminal.

16. A cell switching device, characterized in that: The device comprises: A second sending module is used to send a handover request to the first network device, wherein the handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device; wherein the handover request includes location information of the terminal and a first SSB index of a third cell measured by the terminal; A second receiving module, configured to receive a handover response message sent by the first network device, where the handover response message is used to indicate that the first network device allows the terminal to be handed over to the first cell; The handover response message is sent by the first network device to the second network device when the first network device determines, according to the location information, that the terminal is located in the beam coverage range corresponding to the second SSB index of the first cell, and the first SSB index of the third cell matches the second SSB index of the first cell; The first network device is also used to send a random access response MSG2 to the terminal in all beam directions of the first cell when it is determined based on the location information that the terminal is located in the beam coverage range corresponding to the second SSB index of the first cell, and the first SSB index of the third cell does not match the second SSB index of the first cell; and receive a radio link control RRC reconfiguration completion message sent by the terminal, the RRC reconfiguration completion message including the SSB index of the beam in which the terminal receives the random access response MSG2.

17. A cell switching device, characterized in that: The device comprises: A third sending module, used to send the location information of the terminal and the first SSB index of the third cell measured by the terminal to the second network device; The second network device is used to send a switching request to the first network device, and receive a switching response message sent by the first network device; The handover request is used to request a terminal in a second cell corresponding to the second network device to access a first cell corresponding to the first network device; the handover request includes location information of the terminal and a first SSB index of a third cell measured by the terminal; and the handover response message is used to indicate that the first network device allows the terminal to be handed over to the first cell; Wherein, the device further comprises: A sixth information receiving module, configured to receive a random access response MSG2 sent by the first network device in all beam directions of the first cell corresponding to the first network device; The sixth information sending module is used to send an RRC reconfiguration completion message to the first network device, and the RRC reconfiguration completion message includes the SSB index of the beam of the random access response MSG2 received by the terminal.

18. A network device, characterized in that: include: A processor, a memory, and a program stored in the memory and executable on the processor, wherein when the program is executed by the processor, the program implements the steps of the cell switching method according to any one of claims 1 to 7, or implements the steps of the cell switching method according to any one of claims 8 to 11.

19. A terminal, characterized in that: include: A processor, a memory, and a program stored in the memory and executable on the processor, wherein when the program is executed by the processor, the steps in the cell switching method according to any one of claims 12 to 14 are implemented.

20. A readable storage medium, characterized in that: The readable storage medium stores a program, and when the program is executed by the processor, it implements the steps in the cell switching method as described in any one of claims 1 to 7, or implements the steps in the cell switching method as described in any one of claims 8 to 11, or implements the steps in the cell switching method as described in any one of claims 12 to 14.

21. A computer program product, characterized in that The method comprises computer instructions, which, when executed by a processor, implement the steps in the cell switching method according to any one of claims 1 to 7, or implement the steps in the cell switching method according to any one of claims 8 to 11, or implement the steps in the cell switching method according to any one of claims 12 to 14.

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