Cell handover method, device, storage medium and product

Abstract

Embodiments of the present application provide a cell switching method, device, storage medium and product, and relate to the technical field of communication. The method comprises: a network device of an original cell sending switching configuration information for configuring a candidate cell to perform conditional LTM cell switching when a condition is met, to a terminal device; and the terminal device accessing a target cell by using a beam of the candidate cell that meets the condition, to complete cell switching, when the terminal device evaluates that the candidate cell meets the condition. In this way, the switching robustness can be improved.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to cell handover methods, devices, storage media and products. Background Technology

[0002] Mobility has always been a major issue for the 3rd Generation Partnership Project (3GPP). Therefore, each release (R) of the standards and specifications developed by 3GPP introduces enhancement technologies. For example, in release R18, to address issues such as data rate fluctuations, signaling overhead, and latency caused by frequent terminal handovers, Layer 1 / L2-triggered mobility (LTM) was introduced for the 5G New Radio (NR) interface. However, this LTM is triggered by network equipment and the handover occurs immediately, resulting in poor handover robustness. Therefore, a handover method with better robustness is urgently needed. Summary of the Invention

[0003] This application provides a cell handover method, device, storage medium, and product, which are applied in the field of communication technology, aiming to perform conditional LTM cell handover when a candidate cell meets the corresponding execution conditions, thereby improving handover robustness.

[0004] Firstly, embodiments of this application propose a cell handover method. This method can be executed by a terminal device, or by a component (e.g., a chip or circuit) configured in the terminal device. Embodiments of this application do not limit this.

[0005] For example, the method includes: receiving conditional LTM-triggered handover configuration information sent by the original cell network device, wherein the handover configuration information is used to configure the candidate cell to perform conditional LTM cell handover when the execution conditions are met; the candidate cell is one or more; when a candidate cell that meets the execution conditions is evaluated, the beam of the candidate cell that meets the execution conditions is used to access the target cell to complete the cell handover.

[0006] It should be understood that the original cell network equipment configures candidate cells to perform conditional LTM cell handover when the execution conditions are met by switching configuration information. This allows the terminal equipment to use the beam of the candidate cell that meets the execution conditions to access the target cell when it evaluates a candidate cell that meets the execution conditions, instead of being triggered by the network equipment and immediately performing the handover, thus improving the handover robustness.

[0007] In other words, the original cell network equipment performs cell handover by sending LTM handover commands to the terminal equipment. This handover method is triggered by the network equipment and occurs immediately upon the terminal equipment receiving the LTM handover command, resulting in poor handover robustness. Therefore, the technical solution provided in this application involves the original cell network equipment sending handover configuration information. When the terminal equipment evaluates a candidate cell that meets the execution conditions based on this handover configuration information, it uses the beam of that candidate cell to access the target cell. Whether a candidate cell that meets the execution conditions is evaluated is the result of autonomous operation on the terminal equipment side. Therefore, if a candidate cell that meets the execution conditions is not evaluated, cell handover can be avoided. Thus, the terminal equipment can perform cell handover when a candidate cell that meets the execution conditions is evaluated, or it can choose not to perform cell handover when no candidate cell that meets the execution conditions is evaluated, improving handover robustness.

[0008] In conjunction with the first aspect, in some implementations of the first aspect, the switching configuration information includes the execution condition information of each candidate cell and the LTM configuration information of the condition;

[0009] The execution condition information includes at least one of the following:

[0010] (1) First condition LTM execution event;

[0011] (2) Second condition LTM execution condition information, which includes a first threshold value and a second threshold value. The first threshold value is used to indicate the threshold value of the beam corresponding to the measurement quality when the candidate cell meets the execution condition, and the second threshold value is used to indicate the threshold value of the beam corresponding to the measurement quality when the original cell meets the execution condition.

[0012] It should be understood that the aforementioned first condition LTM execution event and / or second condition LTM execution condition information can constitute the execution condition information corresponding to each candidate cell, and different execution condition information represents different execution conditions. It should also be understood that a candidate cell can correspond to one or more execution conditions, and different candidate cells can correspond to the same or different execution condition information; this embodiment does not impose any limitations on this.

[0013] It should be understood that the specific form of the first condition LTM execution event can be any form representing "the beam-corresponding measurement quality of the candidate cell is higher than that of the original cell," such as a number, a field, or other form, and this application does not limit this. Similarly, the specific form of the second condition LTM execution condition information can be any form representing "the first threshold value set for the beam-corresponding measurement quality of the candidate cell and the second threshold value set for the beam-corresponding measurement quality of the original cell," such as a number, a field, or other form, and this application does not limit this.

[0014] The LTM configuration information for the above conditions includes: the duration for which the target cell is attempted to be accessed via the selected beam.

[0015] It should be understood that conditional LTM configuration information can be interpreted as configuration information used to implement conditional LTM cell handover. Furthermore, the duration of the attempt to access the target cell via the selected beam is less than the corresponding timing duration of the timeout timer T304.

[0016] It should be noted that the specific form of the duration of the attempt to access the target cell through the selected beam can be any form representing the duration of the attempt to access the target cell through the selected beam, such as numbers, fields or other forms, and this application does not limit it.

[0017] It should also be understood that conditional LTM configuration information can be configured together with the execution condition information corresponding to each candidate cell. That is, for conditional LTM cell handover, the original cell network equipment will configure the configuration information of the candidate cells and the conditional LTM configuration information. The conditional LTM configuration information may include the duration of the attempt to access the target cell through the selected beam, and the configuration information of the candidate cells may include the execution condition information corresponding to each candidate cell, and may also include the measurement information of each candidate cell. Configuring them together can reduce signaling overhead.

[0018] Optionally, the first condition LTM execution event includes any of the following:

[0019] (11) The mean of the measurement quality of the N better beams of the candidate cell is greater than or equal to the measurement quality of any beam of the original cell, where N is an integer greater than 1.

[0020] (12) The measurement quality of any beam in the candidate cell is greater than or equal to the measurement quality of any beam in the original cell.

[0021] (13) The candidate cell has at least one beam whose measurement quality is greater than or equal to the measurement quality of any beam in the original cell.

[0022] (14) The candidate cell has at least one beam whose measurement quality is greater than or equal to that of at least one beam in the original cell.

[0023] (15) The mean of the measurement quality of the N better beams of the candidate cell is greater than or equal to the measurement quality of the N better beams of the original cell, where N is an integer greater than 1.

[0024] It should be understood that the specific content of different first-condition LTM execution events varies. Therefore, the embodiments of this application do not specifically limit the specific content of the first-condition LTM execution event. That is, a first-condition LTM execution event containing any one of the contents can provide the corresponding execution conditions, thereby enabling the terminal device to effectively evaluate candidate cells. This improves the selectivity of execution condition information.

[0025] It should be noted that the specific form of the LTM execution event for each of the above conditions can be any form representing the corresponding execution condition, such as a number, a field, or other forms, and this application does not limit this.

[0026] Optionally, the first threshold value includes any of the following:

[0027] (21) The first threshold value is the threshold value at which the measurement quality of K better beams corresponding to the candidate cell is greater than or equal to that of the candidate cell, where K is an integer greater than or equal to 1;

[0028] (22) The first threshold is the threshold value at which the measurement quality of any beam in the candidate cell is greater than or equal to the threshold value.

[0029] (23) The first threshold is the threshold value at which the mean of the measurement quality of M better beams in the candidate cell is greater than or equal to that of the candidate cell, where M is an integer greater than 1.

[0030] It should be understood that the specific content of different first threshold values ​​varies. Therefore, the embodiments of this application do not specifically limit the content of the first threshold value; that is, any combination of a first threshold value and a second threshold value containing any one of the contents can provide the corresponding execution conditions, thereby enabling the terminal device to effectively evaluate candidate cells. This improves the selectivity of execution condition information.

[0031] Optionally, the second threshold value includes any of the following:

[0032] (24) The second threshold is the threshold value when there are L better beams in the original cell whose corresponding measurement quality is less than or equal to L, where L is an integer greater than or equal to 1.

[0033] (25) The second threshold is the threshold value at which the measurement quality of any beam in the original cell is less than or equal to the threshold value.

[0034] (26) The second threshold is the threshold value at which the mean of the measurement quality of the P better beams in the original cell is less than or equal to the threshold value, where P is an integer greater than 1.

[0035] It should be understood that the specific content of different second threshold values ​​varies. Therefore, the embodiments of this application do not specifically limit the specific content of the second threshold value; that is, a combination of a first threshold value containing any one of the contents and a second threshold value containing any one of the contents can provide corresponding execution conditions, thereby enabling the terminal device to effectively evaluate candidate cells. This improves the selectivity of execution condition information.

[0036] It should be noted that the specific form of each threshold value corresponding to each of the above-mentioned communities can be any form representing the corresponding execution conditions, such as numbers, fields or other forms, and this application does not limit this.

[0037] Optionally, candidate cells that meet the execution conditions include: candidate cells that meet the first condition LTM execution event;

[0038] Alternatively, candidate cells that meet both the first and second thresholds;

[0039] Alternatively, the LTM execution event satisfies the first condition and the candidate cell satisfies both the first and second thresholds.

[0040] It should be understood that when the execution condition information includes different first-condition LTM execution events, the terminal device can evaluate candidate cells that satisfy different first-condition LTM execution events. Therefore, the availability of candidate cells that satisfy different first-condition LTM execution conditions increases the selectivity of candidate cells.

[0041] It should also be understood that when the execution condition information includes different second condition LTM execution condition information, the terminal device can evaluate candidate cells that meet different first threshold values ​​and / or different second threshold values, and the candidate cells that meet different first threshold values ​​and / or different second threshold values ​​improve the selectivity of candidate cells.

[0042] It should also be understood that when the execution condition information includes different first-condition LTM execution events and / or different second-condition LTM execution condition information, the terminal device can evaluate candidate cells that satisfy different first-condition LTM execution events and different first threshold values ​​and / or different second threshold values. Therefore, the availability of candidate cells that satisfy different first-condition LTM execution events and different first threshold values ​​and / or different second threshold values ​​increases the selectivity of candidate cells. Furthermore, different types of candidate cells further enhance the selectivity of candidate cells.

[0043] Optionally, the beams of candidate cells that meet the execution conditions are:

[0044] Any first beam or a first beam with a larger measurement quality; the first beam is a beam of a candidate cell that satisfies the first condition LTM execution event, or a beam of a candidate cell that satisfies both the first threshold and the second threshold, or a beam of a candidate cell that satisfies both the first condition LTM execution event and the first threshold and the second threshold.

[0045] It should be understood that there are three types of candidate cells that meet the execution conditions. Therefore, when a candidate cell of one type is evaluated, the terminal can execute the corresponding beam determination scheme.

[0046] Therefore, when different execution condition information corresponds to the same or different types of "candidate cells that meet the execution conditions", the terminal device can determine the beam of the "candidate cell that meets the execution conditions" and then use the beam of the candidate cell that meets the execution conditions to access the target cell to complete the cell handover, thereby improving the universality of cell handover.

[0047] Optionally, if there are multiple first beams, the beam of a candidate cell that meets the execution conditions is used to access the target cell to complete the cell handover, including:

[0048] When accessing the target cell using any first beam or a first beam with higher measurement quality, the first timer and timeout timer T304 are started. The first timer is the timer corresponding to the duration of the attempt to access the target cell through the selected beam.

[0049] If the user successfully accesses the target cell before the first timer expires, the cell handover is completed.

[0050] If access to the target cell is not successful before the first timer expires and T304 has not expired, another first beam will be used to access the target cell and the first timer will be restarted until T304 expires or access to the target cell is successful.

[0051] It should be understood that the timing duration of the attempt to access the target cell controls the access operation corresponding to "using any first beam or the first beam with higher measurement quality to access the target cell". If the access to the target cell is not successful before the first timer expires and T304 does not expire, it means that the access to the target cell was not successful within the timing duration of the attempt to access the target cell. The beam reselection can be initiated in time, and the reselected beam can be used to re-access the target cell. This avoids the phenomenon of low cell handover efficiency caused by the access operation time corresponding to the same beam being too long, thus improving the cell handover success rate and efficiency.

[0052] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes:

[0053] The system receives Medium Access Control (MAC) Control Element (CE) signaling, which includes the active Transmission Configuration Indication (TCI) status identifier corresponding to the candidate cell. When receiving the MAC CE signaling, candidate cells meeting the execution conditions have already been evaluated. It should be understood that the MAC CE signaling includes the active TCI status identifier corresponding to the candidate cell, and there is a mapping relationship between this TCI status identifier and a beam. Therefore, different TCI status identifiers can indicate different beams to the terminal device. This allows the terminal device to determine the beam of the candidate cell that meets the execution conditions based on the MAC CE signaling after identifying the candidate cell, and use that beam to access the target cell, thereby improving the cell handover success rate.

[0054] Optionally, candidate cells that meet the execution conditions include:

[0055] The first candidate cell; wherein, the first candidate cell is a candidate cell that meets the first condition LTM execution event and whose MAC CE signaling includes the corresponding TCI status identifier;

[0056] or,

[0057] The second candidate cell is a candidate cell that meets the first threshold and the second threshold and includes the corresponding TCI status identifier in the MAC CE signaling.

[0058] or,

[0059] The third candidate cell is a candidate cell that satisfies the first condition LTM execution event and satisfies the first threshold and the second threshold, and includes the corresponding TCI status identifier in the MAC CE signaling.

[0060] It should be understood that when a terminal device receives MAC CE signaling, and the execution condition information includes different first-condition LTM execution events, the terminal device can evaluate candidate cells that satisfy different first-condition LTM execution events and whose MAC CE signaling includes the corresponding TCI status identifier. Therefore, the selectivity of candidate cells can be improved by identifying candidate cells that satisfy different first-condition LTM execution conditions and whose MAC CE signaling includes the corresponding TCI status identifier.

[0061] It should also be understood that when the terminal device receives MAC CE signaling, and the execution condition information includes different second condition LTM execution condition information, the terminal device can evaluate candidate cells that meet different first threshold values ​​and / or meet different second threshold values ​​and whose MAC CE signaling includes the corresponding TCI status identifier, and the selectivity of candidate cells can be improved.

[0062] It should also be understood that when the execution condition information includes different first-condition LTM execution events and / or different second-condition LTM execution condition information, the terminal device can evaluate candidate cells that satisfy different first-condition LTM execution events and different first threshold values ​​and / or different second threshold values, and that include the corresponding TCI status identifier in the MAC CE signaling. Therefore, candidate cells that satisfy different first-condition LTM execution events and different first threshold values ​​and / or different second threshold values, and that include the corresponding TCI status identifier in the MAC CE signaling, can improve the selectivity of candidate cells. Furthermore, different types of candidate cells further enhance the selectivity of candidate cells.

[0063] Optionally, the target TCI status identifier in the MAC CE signaling is one; the target TCI status identifier is the TCI status identifier corresponding to the first candidate cell, or the target TCI status identifier is the TCI status identifier corresponding to the second candidate cell, or the target TCI status identifier is the TCI status identifier corresponding to the third candidate cell.

[0064] The beam of the candidate cell that meets the execution conditions is the second beam, which is the beam corresponding to the target TCI status identifier included in the MAC CE signaling.

[0065] In other words, when there is only one target TCI status identifier in the MAC CE signaling, the terminal device can determine the beam of the "candidate cell that meets the execution conditions" even when different execution condition information corresponds to the same or different types of "candidate cells that meet the execution conditions". Then, it can use the beam of the "candidate cell that meets the execution conditions" to access the target cell. This can effectively solve the problem of inconsistency between "any first beam or the first beam with larger measurement quality" and "the beam of the candidate cell that meets the execution conditions is the second beam" caused by using different beam determination schemes at the same time.

[0066] Optionally, the target TCI status identifier in the MAC CE signaling can be multiple; the target TCI status identifier is the TCI status identifier corresponding to the first candidate cell, or the target TCI status identifier is the TCI status identifier corresponding to the second candidate cell; or the target TCI status identifier is the TCI status identifier corresponding to the third candidate cell.

[0067] The beam of the candidate cell that meets the execution conditions is the third beam, and the third beam is one of the following beams:

[0068] The beam corresponding to the first target TCI status identifier included in the MAC CE signaling, wherein the first target TCI status identifier is the target TCI status identifier arranged in a preset position;

[0069] or,

[0070] The MAC CE signaling includes the beam corresponding to the second target TCI status identifier. The beam corresponding to the second target TCI status identifier is the beam that successfully accessed the target cell before the duration of the attempt to access the target cell via the selected beam expired.

[0071] It should be understood that the above-mentioned preset position can be understood as the first position, the adjacent position of the first position, the last position, the adjacent position of the last position, etc. The specific position of the preset position is not specifically limited in the embodiments of this application.

[0072] In other words, when there are multiple target TCI status identifiers in the MAC CE signaling, the terminal device can determine the beam of the "candidate cell that meets the execution conditions" even when different execution condition information corresponds to the same or different types of "candidate cells that meet the execution conditions". Then, it can use the beam of the "candidate cell that meets the execution conditions" to access the target cell. This can effectively solve the problem of inconsistency between "any first beam or the first beam with larger measurement quality" and "the beam of the candidate cell that meets the execution conditions is the third beam" caused by using different beam determination schemes at the same time.

[0073] Optionally, if the third beam is the beam corresponding to the second target TCI status identifier included in the MAC CE signaling, then the beam of the candidate cell that meets the execution conditions is used to access the target cell to complete the cell handover, including:

[0074] When accessing the target cell using a beam corresponding to a target TCI status identifier, a first timer and a timeout timer T304 are started. The first timer is the timer corresponding to the duration of the attempt to access the target cell through the selected beam.

[0075] If the user successfully accesses the target cell before the first timer expires, the cell handover is completed.

[0076] If access to the target cell is not successful before the first timer expires and T304 has not expired, the beam corresponding to another target TCI status identifier will be used to access the target cell and the first timer will be restarted until T304 expires or access to the target cell is successful.

[0077] It should be understood that the timing duration of the attempt to access the target cell controls the access operation corresponding to "accessing the target cell using a beam corresponding to a target TCI status identifier". If access to the target cell is not successful before the first timer expires and T304 does not expire, it means that access to the target cell was not successful within the timing duration of the attempt to access the target cell. In this case, beam reselection can be initiated in time, and the reselected beam can be used to re-access the target cell. This avoids the phenomenon of low cell handover efficiency caused by excessively long access operation time corresponding to the same beam, thus improving the cell handover success rate and efficiency.

[0078] Optionally, the switching configuration information is carried in Radio Resource Control (RRC) reconfiguration information or in proprietary signaling.

[0079] It should be understood that, in this application embodiment, the switching configuration information is carried in the Radio Resource Control (RRC) reconfiguration information, which reduces signaling overhead and effectively avoids the waste of communication resources; or the switching configuration information is carried in dedicated signaling, which can improve the parsing speed of execution condition information.

[0080] Secondly, embodiments of this application provide a cell handover method, which can be executed by a network device, which may be the original cell network device, or it may be executed by a component (such as a chip or circuit) configured in the original cell network device. This application does not limit this.

[0081] For example, the method includes: sending conditional Layer 1 / 2 triggered mobility LTM handover configuration information to the terminal device, wherein the handover configuration information is used to configure the candidate cell to perform conditional LTM cell handover when the execution conditions are met; the candidate cell is one or more.

[0082] In other words, how the terminal device performs LTM cell handover based on the conditions is triggered by the original cell network equipment, but not entirely decided by the original cell network equipment. Therefore, when the terminal device evaluates a candidate cell that meets the execution conditions based on the handover configuration information, it uses the beam of the candidate cell that meets the execution conditions to access the target cell. Whether a candidate cell that meets the execution conditions is evaluated is the result of autonomous operation on the terminal device side. Therefore, if a candidate cell that meets the execution conditions is not evaluated, cell handover can be skipped. Thus, the terminal device can perform cell handover when a candidate cell that meets the execution conditions is evaluated, or it can skip cell handover when a candidate cell that meets the execution conditions is not evaluated, thereby improving handover robustness.

[0083] In conjunction with the second aspect, in some implementations of the second aspect, the handover configuration information includes the execution condition information of each candidate cell and the LTM configuration information of the condition;

[0084] The execution condition information includes at least one of the following:

[0085] First condition LTM execution event;

[0086] The second condition LTM execution condition information includes a first threshold value and a second threshold value. The first threshold value is used to indicate the threshold value of the beam corresponding to the measurement quality when the candidate cell meets the execution condition, and the second threshold value is used to indicate the threshold value of the beam corresponding to the measurement quality when the original cell meets the execution condition.

[0087] It should be understood that, under the second aspect, the interpretation of each piece of information contained in the execution condition information is consistent with the interpretation of each piece of information contained in the execution condition information in the first aspect, and will not be repeated here.

[0088] It should be noted that the execution condition information may include different content, and different execution conditions may be corresponding to different content in the execution condition information, so as to improve the flexibility of evaluating candidate cells.

[0089] It should also be understood that the conditional LTM configuration information includes: the duration for which access to the target cell is attempted via the selected beam.

[0090] It should also be understood that the duration of the attempt to access the target cell via the selected beam is less than the corresponding timing duration of the timeout timer T304.

[0091] It should be noted that the specific form of the duration of the attempt to access the target cell through the selected beam can be any form representing the duration of the attempt to access the target cell through the selected beam, such as numbers, fields or other forms, and this application does not limit it.

[0092] Optionally, the first condition LTM execution event includes any of the following:

[0093] (11) The mean of the measurement quality of the N better beams of the candidate cell is greater than or equal to the measurement quality of any beam of the original cell, where N is an integer greater than 1.

[0094] (12) The measurement quality of any beam in the candidate cell is greater than or equal to the measurement quality of any beam in the original cell.

[0095] (13) The candidate cell has at least one beam whose measurement quality is greater than or equal to the measurement quality of any beam in the original cell.

[0096] (14) The candidate cell has at least one beam whose measurement quality is greater than or equal to that of at least one beam in the original cell.

[0097] (15) The mean of the measurement quality of the N better beams of the candidate cell is greater than or equal to the measurement quality of the N better beams of the original cell, where N is an integer greater than 1.

[0098] It should be understood that the specific content of different first-condition LTM execution events varies. Therefore, the embodiments of this application do not specifically limit the specific content of the first-condition LTM execution event. That is, a first-condition LTM execution event containing any one of the contents can provide the corresponding execution conditions, thereby enabling the terminal device to effectively evaluate candidate cells. This improves the selectivity of execution condition information.

[0099] Optionally, the first threshold value includes any of the following:

[0100] (21) The first threshold value is the threshold value at which the measurement quality of K better beams corresponding to the candidate cell is greater than or equal to that of the candidate cell, where K is an integer greater than or equal to 1;

[0101] (22) The first threshold is the threshold value at which the measurement quality of any beam in the candidate cell is greater than or equal to the threshold value.

[0102] (23) The first threshold is the threshold value at which the mean of the measurement quality of M better beams in the candidate cell is greater than or equal to that of the candidate cell, where M is an integer greater than 1.

[0103] It should be understood that the specific content of different first threshold values ​​varies. Therefore, the embodiments of this application do not specifically limit the content of the first threshold value; that is, any combination of a first threshold value and a second threshold value containing any one of the contents can provide the corresponding execution conditions, thereby enabling the terminal device to effectively evaluate candidate cells. This improves the selectivity of execution condition information.

[0104] Optionally, the second threshold value includes any of the following:

[0105] (24) The second threshold is the threshold value when there are L better beams in the original cell whose corresponding measurement quality is less than or equal to L, where L is an integer greater than or equal to 1.

[0106] (25) The second threshold is the threshold value at which the measurement quality of any beam in the original cell is less than or equal to the threshold value.

[0107] (26) The second threshold is the threshold value at which the mean of the measurement quality of the P better beams in the original cell is less than or equal to the threshold value, where P is an integer greater than 1.

[0108] It should be understood that the specific content of different second threshold values ​​varies. Therefore, the embodiments of this application do not specifically limit the specific content of the second threshold value; that is, a combination of a first threshold value containing any one of the contents and a second threshold value containing any one of the contents can provide corresponding execution conditions, thereby enabling the terminal device to effectively evaluate candidate cells. This improves the selectivity of execution condition information.

[0109] In conjunction with the second aspect, some implementations of the second aspect also include the following methods:

[0110] Send MAC CE signaling, which includes the activated transmission configuration index (TCI) status identifier corresponding to the candidate cell; when sending MAC CE signaling, the terminal device has already evaluated a candidate cell that meets the execution conditions.

[0111] It should be understood that the MAC CE signaling includes the active transmission configuration index (TCI) status identifier corresponding to the candidate cell, and there is a mapping relationship between the TCI status identifier and the beam. Therefore, different TCI status identifiers can indicate different beams to the terminal device, so that after the terminal device determines the candidate cell that meets the execution conditions, it can determine the beam of the candidate cell that meets the execution conditions based on the MAC CE signaling and use the beam to access the target cell, thereby improving the cell handover success rate.

[0112] In conjunction with the second aspect, in some implementations of the second aspect, for candidate cells where the corresponding TCI status identifier in the MAC CE signaling is one, the method further includes:

[0113] Send the corresponding TCI status identifier in the MAC CE signaling to the candidate cell network device. The candidate cell includes a first candidate cell, a second candidate cell, or a third candidate cell. The first candidate cell is a candidate cell that meets the first condition LTM execution event and whose MAC CE signaling includes the corresponding TCI status identifier. The second candidate cell is a candidate cell that meets the first threshold value and the second threshold value and whose MAC CE signaling includes the corresponding TCI status identifier. The third candidate cell is a candidate cell that meets the first condition LTM execution event and meets the first threshold value and the second threshold value and whose MAC CE signaling includes the corresponding TCI status identifier.

[0114] The original cell network equipment sends MAC CE signaling to the terminal equipment, which includes the active transmission configuration index (TCI) status identifier corresponding to the candidate cell. It also sends the TCI status identifier corresponding to the candidate cell network equipment in the MAC CE signaling to all candidate cell network equipment. This allows all candidate cell network equipment that may become the target cell to know in advance which beam corresponding to the TCI status identifier in the cell the terminal equipment may use, thereby improving the cell success rate.

[0115] Optionally, for candidate cells where there are multiple corresponding TCI status identifiers in the MAC CE signaling, the method further includes:

[0116] Send multiple corresponding TCI status identifiers arranged in preset positions to the candidate cell network device;

[0117] Alternatively, multiple corresponding TCI status identifiers and indication information can be sent to the candidate cell network device. The indication information is used to indicate which TCI status identifier is arranged in a preset position from the multiple corresponding TCI status identifiers.

[0118] The candidate cells include a first candidate cell, a second candidate cell, or a third candidate cell. The first candidate cell is a candidate cell that meets the first condition LTM execution event and whose MAC CE signaling includes the corresponding TCI status identifier. The second candidate cell is a candidate cell that meets the first threshold and the second threshold and whose MAC CE signaling includes the corresponding TCI status identifier. The third candidate cell is a candidate cell that meets the first condition LTM execution event and meets the first threshold and the second threshold and whose MAC CE signaling includes the corresponding TCI status identifier.

[0119] In other words, by using the above two methods of sending information to the candidate cell network device, the candidate cell network device can know in advance which candidate cell beam the terminal device may use before the terminal device “accesses the target cell by using the beam of the candidate cell that meets the execution conditions”, which can improve the success rate of cell handover.

[0120] Optionally, the switching configuration information is carried in Radio Resource Control (RRC) reconfiguration information or in proprietary signaling.

[0121] It should be understood that the original cell network equipment carries the handover configuration information in the Radio Resource Control (RRC) reconfiguration information, which reduces signaling overhead and effectively avoids the waste of communication resources; or it carries the handover configuration information in dedicated signaling, which can improve the parsing speed of execution condition information.

[0122] Thirdly, embodiments of this application provide a cell handover apparatus, including various modules or units for performing the methods of the first aspect and any possible implementation thereof.

[0123] Fourthly, a cell handover apparatus is provided, comprising various modules or units for performing the methods of the second aspect and any possible implementation thereof.

[0124] Fifthly, a cell handover apparatus is provided, including a processor. The processor is coupled to a memory and can be used to execute instructions in the memory to implement the methods described in the first aspect and any possible implementation thereof. Optionally, the apparatus further includes a memory. Optionally, the apparatus further includes a communication interface, to which the processor is coupled.

[0125] In one implementation, the cell handover device is a terminal device. When the cell handover device is a terminal device, the communication interface can be a transceiver or an input / output interface.

[0126] In another implementation, the cell handover device is a chip configured in the terminal device. When the cell handover device is a chip configured in the terminal device, the communication interface can be an input / output interface.

[0127] Optionally, the transceiver can be a transceiver circuit. Optionally, the input / output interface can be an input / output circuit.

[0128] Sixthly, a cell handover apparatus is provided, including a processor. The processor is coupled to a memory and can be used to execute instructions in the memory to implement the methods of the second aspect and any possible implementation thereof. Optionally, the apparatus further includes a memory. Optionally, the apparatus further includes a communication interface, to which the processor is coupled.

[0129] In one implementation, the cell handover device is a network device. When the cell handover device is a network device, the communication interface can be a transceiver or an input / output interface.

[0130] In another implementation, the cell handover device is a chip configured in the network device. When the cell handover device is a chip configured in the network device, the communication interface can be an input / output interface.

[0131] Optionally, the transceiver can be a transceiver circuit. Optionally, the input / output interface can be an input / output circuit.

[0132] A seventh aspect provides a processor, comprising: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive signals through the input circuit and transmit signals through the output circuit, causing the processor to execute the methods of the first aspect to the second aspect and any possible implementation thereof.

[0133] In specific implementation, the processor can be one or more chips, the input circuit can be input pins, the output circuit can be output pins, and the processing circuit can be transistors, gate circuits, flip-flops, and various logic circuits. The input signal received by the input circuit can be received and input by, for example, but not limited to, a receiver, and the signal output by the output circuit can be output to, for example, but not limited to, a transmitter and transmitted by the transmitter. Furthermore, the input circuit and the output circuit can be the same circuit, which is used as the input circuit and the output circuit at different times. This application does not limit the specific implementation of the processor and various circuits.

[0134] Eighthly, a cell handover apparatus is provided, including a processor and a memory. The processor is used to read instructions stored in the memory and to receive signals via a receiver and transmit signals via a transmitter to execute the methods of the first aspect to the second aspect and any possible implementation thereof.

[0135] Optionally, the processor may be one or more, and the memory may be one or more.

[0136] Optionally, the memory may be integrated with the processor, or the memory may be separated from the processor.

[0137] In specific implementation, the memory can be a non-transitory memory, such as read-only memory (ROM), which can be integrated on the same chip as the processor or set on different chips. The embodiments of this application do not limit the type of memory or the way the memory and processor are set.

[0138] It should be understood that the relevant data interaction process, such as sending "handover configuration information for configuring candidate cells to perform conditional LTM cell handover when execution conditions are met," can be the process of the processor outputting "handover configuration information for configuring candidate cells to perform conditional LTM cell handover when execution conditions are met," and the receiving capability information can be the process of the processor receiving input capability information. Specifically, the data output by the processor can be output to the transmitter, and the input data received by the processor can come from the receiver. The transmitter and receiver can be collectively referred to as a transceiver.

[0139] The cell handover device in the eighth aspect above can be one or more chips. The processor in the cell handover device can be implemented in hardware or software. When implemented in hardware, the processor can be a logic circuit, integrated circuit, etc.; when implemented in software, the processor can be a general-purpose processor that reads software code stored in memory. The memory can be integrated into the processor or located outside the processor and exist independently.

[0140] Ninthly, embodiments of this application provide a terminal device, including a processor, a memory, and a transceiver. The memory is used to store computer execution instructions, the transceiver is used to send and receive data, and the processor is used to execute the computer execution instructions stored in the memory. When executing the computer execution instructions stored in the memory, the processor is used to instruct the terminal device to execute the methods described in the first aspect and any possible implementation of the first aspect.

[0141] In a tenth aspect, embodiments of this application provide a network device, including a processor, a memory, and a transceiver. The memory is used to store computer-executed instructions, the transceiver is used to send and receive data, and the processor is used to run the computer-executed instructions. When the processor executes the computer-executed instructions stored in the memory, it instructs the network device to perform the methods described in the second aspect and any possible implementation of the second aspect.

[0142] Eleventhly, embodiments of this application provide a computer-readable storage medium storing a computer program or instructions that, when executed on a computer, cause the computer to perform the methods described in the first to second aspects and any possible implementation thereof.

[0143] In a twelfth aspect, this application provides a chip or chip system including at least one processor and a communication interface. The communication interface and the at least one processor are interconnected via a circuit. The at least one processor is used to run computer programs or instructions to perform the methods described in the first aspect or any possible implementation thereof. The communication interface in the chip can be an input / output interface, pins, or circuits, etc.

[0144] In a thirteenth aspect, embodiments of this application provide a computer program product including a computer program, which, when run on a computer, causes the computer to perform the methods described in the first aspect to the second aspect and any possible implementation thereof.

[0145] In one possible implementation, the chip or chip system described above in this application further includes at least one memory storing instructions. The memory can be an internal storage unit of the chip, such as a register or cache, or it can be a storage unit of the chip itself (e.g., read-only memory, random access memory, etc.).

[0146] It should be understood that the third, fifth, and ninth aspects of this application correspond to the technical solutions of the first aspect of this application, the fourth, sixth, and tenth aspects of this application correspond to the technical solutions of the second aspect of this application, and the seventh, eighth, and eleventh to thirteenth aspects of this application correspond to the technical solutions of the first and second aspects of this application. The beneficial effects obtained by each aspect and the corresponding feasible implementation are similar, and will not be described in detail again. Attached Figure Description

[0147] Figure 1 This is a schematic diagram of the architecture of the communication system 100 used in the embodiments of this application;

[0148] Figure 2 This is an example illustration of the signaling interaction diagram between the terminal device and various network devices in the CHO process 200;

[0149] Figure 3 This is an exemplary diagram illustrating the signaling interaction between the terminal device and various network devices in LTM procedure 300;

[0150] Figure 4 This is a schematic flowchart illustrating the cell handover method 400 provided in the embodiments of this application from the perspective of device interaction;

[0151] Figure 5 This is a schematic diagram of the MAC CE signaling structure;

[0152] Figure 6 This is a schematic flowchart illustrating the cell handover method 600 provided in the embodiments of this application from the perspective of device interaction;

[0153] Figure 7 This is a schematic flowchart illustrating the cell handover method 700 provided in the embodiments of this application from the perspective of device interaction;

[0154] Figure 8This is a schematic block diagram of the cell handover device 8000 provided in the embodiments of this application;

[0155] Figure 9 This is a possible structural schematic diagram of the terminal device 9000 provided in an embodiment of this application;

[0156] Figure 10 This is a possible structural diagram of a network device provided in the embodiments of this application, for example, it can be a structural diagram of a base station 1000. Detailed Implementation

[0157] To facilitate understanding of the cell handover method, device, storage medium, and product provided in the embodiments of this application, the cell handover method, its system architecture, and application scenarios provided in the embodiments of this application will be described below. It is understood that the system architecture and application scenarios described in the embodiments of this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application and do not constitute a limitation on the technical solutions provided in the embodiments of this application.

[0158] The technical solutions of this application can be applied to communication scenarios in various communication systems, such as: Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD) systems, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) systems, future 5th Generation (5G) systems or new radio access technologies (NR), vehicle-to-other devices (V2X), where V2X can include vehicle-to-network (V2N), vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P), etc., Long Term Evolution-Vehicle (LTE-V) communication, vehicle-to-everything (V2X) communication, and machine-type communication. Communication technologies such as MTC (Mechanical, Communication and Communication Technology), Internet of Things (IoT), Long Term Evolution-Machine (LTE-M), and Machine to Machine (M2M) are mentioned.

[0159] Furthermore, this application can be applied to various specific communication scenarios, such as point-to-point transmission between base stations and terminals or between terminals, multi-hop transmission between base stations and terminals, and dual connectivity (DC) or multi-connectivity scenarios involving multiple base stations and terminals. It should be noted that the above specific communication application scenarios are merely examples and do not constitute limitations. Specifically, it can be applied to scenarios where LTM handover and Conditional Handover (CHO) can coexist within the aforementioned specific communication scenarios.

[0160] To facilitate understanding of the embodiments of this application, firstly, in conjunction with Figure 1 The communication system applicable to the embodiments of this application is described in detail. Figure 1This is a schematic diagram of the architecture of the communication system 100 used in an embodiment of this application. Figure 1 As shown, the communication system 100 may include at least one terminal device, such as Figure 1 The terminal device 110 is shown. The communication system 100 may also include at least one network device, such as... Figure 1 The primary network device 120 is shown. The terminal device 110 can be mobile or fixed. The primary network device 120 is a device that can communicate with the terminal device 110 via a wireless link, such as a base station or base station controller. The primary network device 120 can provide communication coverage for a specific geographical area and can communicate with terminal devices located within that coverage area (cell).

[0161] Figure 1 An exemplary embodiment illustrates a terminal device and a network device. Optionally, when the terminal device is in a single-connection state, the communication system 100 may include at least one network device. For example, to distinguish the differences between the network devices before and after the terminal device performs a handover, the communication system 100 may include the original cell network device and the target cell network device. Optionally, when the terminal device is in a dual-connection state, the communication system 100 may include at least one primary cell network device and at least one primary and secondary cell network device. The coverage area of ​​the primary and secondary cell network devices may include other numbers of terminal devices, which is not limited in this embodiment. For example, to distinguish the differences between the network devices before and after the terminal device performs a handover under dual-connection, the communication system 100 may include the original primary cell network device and the target primary cell network device.

[0162] The aforementioned communication devices, such as Figure 1 The terminal device 110 and the original cell network device 120 can be configured with multiple antennas. These multiple antennas may include at least one transmitting antenna for transmitting signals and at least one receiving antenna for receiving signals. Additionally, each communication device also includes a transmitter chain and a receiver chain, which, as will be understood by those skilled in the art, may include multiple components related to signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, or antennas). Therefore, the network device and the terminal device can communicate via multi-antenna technology.

[0163] Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, but the embodiments of this application are not limited thereto.

[0164] In this embodiment of the application, the network device can be any device with wireless transceiver capabilities. This equipment includes, but is not limited to: evolved Node B (eNB), Radio Network Controller (RNC), Node B (NB), Base Station Controller (BSC), Base Transceiver Station (BTS), Home base station (e.g., Home evolved Node B, or HomeNode B, HNB), Base Band Unit (BBU), Access Point (AP), Wireless Relay Node, Wireless Backhaul Node, Transmission Point (TP), or Transmission and Reception Point (TRP) in a Wireless Fidelity (WIFI) system. It can also be a next-generation base station (gNB) in a 5G system, such as NR, or a transmission point (TRP or TP), one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, or a network node constituting a gNB or transmission point, such as a Base Band Unit (BBU) or a Distributed Unit (DU).

[0165] In some deployments, a gNB may include a centralized unit (CU) and a distribution unit (DU). The gNB may also include an active antenna unit (AAU). The CU implements some of the gNB's functions, and the DU implements others. For example, the CU handles non-real-time protocols and services, implementing radio resource control (RRC) and packet data convergence protocol (PDCP) layer functions. The DU handles physical layer protocols and real-time services, implementing radio link control (RLC), media access control (MAC), and physical (PHY) layer functions. The AAU implements some physical layer processing functions, radio frequency processing, and active antenna-related functions. Since RRC layer information ultimately becomes PHY layer information, or is derived from PHY layer information, in this architecture, higher-layer signaling, such as RRC layer signaling, can be considered to be sent by the DU, or by the DU+AAU. It is understood that network devices can be devices that include one or more of the following: CU nodes, DU nodes, and AAU nodes. In addition, the CU can be classified as a network device in the radio access network (RAN) or as a network device in the core network (CN), and this application does not limit this.

[0166] Network equipment provides services to cells. Terminal devices communicate with cells through transmission resources (e.g., frequency domain resources, or spectrum resources) allocated by the network equipment. The cell can belong to a macro base station (e.g., macro eNB or macro gNB) or to a base station corresponding to a small cell. Small cells can include: metrocell, microcell, pico cell, femto cell, etc. These small cells have the characteristics of small coverage area and low transmission power, and are suitable for providing high-speed data transmission services.

[0167] In the embodiments of this application, the terminal device may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user apparatus. The terminal devices in the embodiments of this application may be mobile phones, tablets, computers with wireless transceiver capabilities, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical care, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, in-vehicle devices, wearable devices, terminal devices in 5G networks, or terminal devices in future evolved public land mobile networks (PLMNs), etc.

[0168] Wearable devices, also known as wearable smart devices, are a general term for devices that utilize wearable technology to intelligently design and develop everyday wearables, such as glasses, gloves, watches, clothing, and shoes. Wearable devices are portable devices worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not merely hardware devices; they achieve powerful functions through software support, data interaction, and cloud interaction. Broadly defined, wearable smart devices include those with comprehensive functions, large sizes, and the ability to perform complete or partial functions without relying on a smartphone, such as smartwatches or smart glasses. They also include devices focused on a specific application function that require the use of other devices, such as smart bracelets and smart jewelry for vital sign monitoring.

[0169] Furthermore, terminal devices can also be terminal devices in Internet of Things (IoT) systems. IoT is an important component of future information technology development, and its main technical feature is connecting objects to networks through communication technologies, thereby realizing an intelligent network that enables human-machine interconnection and machine-to-machine interconnection.

[0170] This application does not limit the specific form of the terminal device.

[0171] To facilitate a clear description of the technical solutions in the embodiments of this application, some terms and technologies involved in the embodiments of this application will be briefly introduced below:

[0172] 1. Conditional handover refers to the process by which a terminal device switches from the current CHO cell to a CHO candidate cell when changes in service conditions or channel quality trigger the switch. This process can be simply referred to as the CHO procedure.

[0173] Figure 2 This example illustrates the signaling interaction diagram between the terminal device and various network devices in the CHO process 200, combined with... Figure 2 The following is a brief explanation of the CHO process 200. The CHO process 200 may specifically include S201 to S209 below.

[0174] S201. The terminal device sends the measurement results to the original cell network device.

[0175] S202, The original community network equipment is determined to execute CHO.

[0176] The original community network equipment determines whether to execute CHO based on the measurement results.

[0177] S203. The original cell network device sends a CHO handover request to the candidate cell network device.

[0178] Candidate cells include target cells and target potential cells.

[0179] S204. The candidate cell network device sends a CHO handover request response to the original cell network device.

[0180] S204 enables the original cell network equipment to obtain the CHO candidate cell configuration information and execution conditions.

[0181] It should be understood that this execution condition is a CHO execution condition. A CHO execution condition can be any one of events A3, A4, and A5, or any two of events A3, A4, and A5, or all of events A3, A4, and A5. Event A3 occurs when the quality of a neighboring cell is better than that of the original cell; this event will trigger a handover. Event A4 occurs when the quality of a neighboring cell is greater than an absolute threshold; this event will trigger a handover. Event A5 occurs when the quality of the original cell is less than an absolute threshold, and the quality of a neighboring cell is greater than an absolute threshold; this event will trigger a handover.

[0182] S205. The original community network equipment sends an RRC reconfiguration message to the terminal equipment.

[0183] Specifically, S205 sends the CHO candidate cell configuration information and execution conditions to the terminal device via RRC reconfiguration messages. It should be understood that the original cell network device can configure a maximum of 8 candidate cells and corresponding execution conditions.

[0184] S206. The terminal device sends an RRC reconfiguration complete message to the original cell network device.

[0185] S207. Terminal equipment undergoes CHO evaluation.

[0186] It should be understood that the terminal device performs CHO evaluation based on the CHO candidate cell configuration information and execution conditions to determine the target cell. When at least one candidate cell meets the corresponding execution conditions, step S208 is executed.

[0187] S208. The terminal device disconnects from the original community network device.

[0188] S209. The terminal device is connected to the target cell network device.

[0189] This completes the CHO process.

[0190] 2. Layer 1 / 2 triggered mobility: also known as LTM, is the process by which the original cell network device performs cell handover on the terminal device based on the L1 measurement results reported by the terminal device and the terminal device's LTM support capability when the terminal device is in a connected state.

[0191] Figure 3 This is an exemplary diagram illustrating the signaling interaction between the terminal device and various network devices in LTM procedure 300. Combined with... Figure 3 The LTM process 300 will be briefly described below. The LTM process 300 may specifically include S301 to S312 as described below.

[0192] S301, The terminal device sends the L1 measurement results to the original cell network device.

[0193] S302, The original community network equipment is determined to perform LTM handover.

[0194] It should be understood that the original community network equipment determines the terminal equipment's support capability for LTM based on the L1 measurement results, and executes S303 when determining to execute LTM.

[0195] S303. The original cell network device sends an LTM handover request to the candidate cell network device.

[0196] Candidate cells include target cells and potential target cells.

[0197] S304. The candidate cell network device sends an LTM handover request response to the original cell network device.

[0198] S304 enables the original cell network equipment to obtain LTM candidate cell configuration information.

[0199] S305, The original community network equipment sends an RRC reconfiguration message to the terminal equipment.

[0200] The RRC reconfiguration message includes LTM candidate cell configuration information. The RRC reconfiguration message is used to instruct the terminal device to perform uplink and downlink synchronization procedures on the candidate cells.

[0201] S306. The terminal device sends an RRC reconfiguration complete message to the original cell network device.

[0202] S307. The terminal equipment performs a downlink synchronization process for LTM candidate cells.

[0203] S308. The terminal device performs an uplink synchronization process for LTM candidate cells.

[0204] S309. The terminal device sends the L1 measurement results to the original cell network device.

[0205] S309 enables the original cell network equipment to determine the target cell.

[0206] S310, the original community network equipment sends an LTM handover command to the terminal equipment.

[0207] The LTM handover instruction may include MAC CE indication information, which may include: Timing Advance (TA), Transmission Configuration Indication State (TCI State) sequence number (IDentity, ID), Contention Free Random Access (CFRA) resource information, and LTM candidate cell configuration information identifier.

[0208] It should be understood that when TA is valid, its specific value will be included in the MAC CE indication information. When invalid, it will not be included in the MAC CE indication information.

[0209] It should also be understood that during the uplink synchronization process for each candidate cell network device, if the RRC reconfiguration message indicates that the terminal device should measure the timing advance itself, then it measures the timing advance of the original cell network device and determines the timing advance of the candidate cell network device based on the reception time difference between the original cell network device and the candidate cell network device; or, the original cell network device triggers contention-free random access through a Physical Downlink Control Channel (PDCCH) order to obtain the timing advance of the candidate cell network device, the terminal device initiates a CFRA to obtain the timing advance of the candidate cell network device, and then the original cell network device determines the validity of the timing advance.

[0210] It should also be understood that if the MAC CE indication information includes a specific value for the TA, the terminal device can achieve handover by sending an uplink signaling message, an uplink data packet, or other uplink information to the target cell network device. The specific content sent is not limited in this application. If the MAC CE indication information does not include a specific value for the TA, the terminal device can measure the TA corresponding to the target cell network device itself and, based on the measurement result, send an uplink signaling message, an uplink data packet, or other uplink information to the target cell network device to achieve handover. The specific content sent is not limited in this application.

[0211] S311. The terminal device disconnects from the original community network device.

[0212] S312. The terminal device executes a random access procedure to the target cell network device to complete the LTM handover.

[0213] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0214] To facilitate understanding of the embodiments of this application, the following description is provided first:

[0215] First, to facilitate a clear description of the technical solutions in the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish identical or similar items with essentially the same function and effect. For example, the first threshold value and the second threshold value are only used to distinguish different threshold values ​​and do not limit their order. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" are not necessarily different.

[0216] Second, in the embodiments of this application, the words "exemplary" or "for example" are used to indicate that they are examples, illustrations, or descriptions. Any embodiment or design that is described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design options. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0217] Third, in the embodiments of this application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, a--c, bc, or abc, where a, b, and c can be single or multiple.

[0218] Fourth, in the embodiments of this application, "when," "if," and "if" all refer to the device making corresponding processing under certain objective circumstances, and are not limited to a time, nor do they require the device to make a judgment action when it is implemented, nor do they mean that there are other limitations.

[0219] Fifth, the term "simultaneously" in the embodiments of this application can be understood as at the same point in time, within a period of time, or within the same cycle. The specific meaning can be understood in conjunction with the context.

[0220] Sixth, in the embodiments of this application, "B corresponding to A" means that B is associated with A. "Execute B according to A" does not mean that B is executed only according to A, but also that B is executed according to A and / or other information.

[0221] Seventh, "predefined" or "preconfigured" can be achieved by pre-storing corresponding codes, tables, or other means of indicating relevant information in the device (e.g., including terminal devices and network devices), and this application does not limit the specific implementation method. "Storing" can refer to storing in one or more memories. The one or more memories can be separate installations or integrated into the encoder or decoder, processor, or communication device. Alternatively, some memories can be separate installations, while others are integrated into the decoder, processor, or communication device. The type of memory can be any form of storage medium, and this application does not limit this.

[0222] The term "predefined" in this application can be understood as definition, pre-defined, stored, pre-stored, pre-negotiated, pre-configured, solidified, or pre-burned.

[0223] Eighth, in the embodiments of this application, "for indicating" can include both direct and indirect indication, as well as explicit and implicit indication. The information indicated by a certain piece of information is called the information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated, such as, but not limited to, directly indicating the information to be indicated, such as the information to be indicated itself or its index. It can also indirectly indicate the information to be indicated by indicating other information, where there is a correlation between the other information and the information to be indicated. It can also indicate only a part of the information to be indicated, while the other parts are known or pre-agreed upon. For example, the indication of the information to be indicated can be achieved by pre-agreed upon (e.g., by a protocol specifying) the existence of a certain information element, thereby reducing the indication overhead to some extent.

[0224] Ninth, several embodiments are described in detail below with reference to multiple flowcharts. However, it should be understood that these flowcharts and their corresponding descriptions are for illustrative purposes only and should not constitute any limitation on this application. Not every step in each flowchart is necessarily required; for example, some steps can be skipped. Furthermore, the execution order of each step is not fixed and is not limited to what is shown in the figures. The execution order of each step should be determined by its function and internal logic.

[0225] In related technologies, LTM is triggered by network devices and the handover is performed immediately, which has the problem of poor handover robustness. Therefore, there is an urgent need for a handover method with better handover robustness.

[0226] In response, this application provides a cell handover method, the main inventive idea of ​​which is as follows:

[0227] To address the poor handover robustness of LTM, this application embodiment considers that the Conditional Handover Hazard (CHO) method allows terminal devices to autonomously decide whether to handover. Therefore, it introduces this autonomous handover capability into LTM, forming a conditional LTM to improve handover robustness. Specifically, the original cell network equipment uses handover configuration information to configure candidate cells to perform conditional LTM cell handover when execution conditions are met. This allows the terminal device to use the beam of a candidate cell that meets the execution conditions to access the target cell when it evaluates it, instead of being triggered by the network equipment and immediately performing a handover, thus improving handover robustness.

[0228] The methods provided in the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0229] It should be understood that the following description is for ease of understanding and explanation only, using the interaction between a terminal device and a network device as an example to illustrate the methods provided in the embodiments of this application. However, this should not constitute any limitation on the subject executing the methods provided in this application. For example, the terminal device shown in the embodiments below can be replaced by components (such as chips or circuits) configured in the terminal device. The network device shown in the embodiments below can also be replaced by components (such as chips or circuits) configured in the network device.

[0230] The embodiments shown below do not specifically limit the structure of the execution subject of the method provided in the embodiments of this application. As long as it is possible to communicate according to the method provided in the embodiments of this application by running a program that records the code of the method provided in the embodiments of this application, for example, the execution subject of the method provided in the embodiments of this application can be a terminal device or a network device, or a functional module in a terminal device or network device that can call and execute a program.

[0231] Figure 4 This is a schematic flowchart illustrating the cell handover method 400 provided in this application embodiment from the perspective of device interaction. For example... Figure 4 As shown, the cell handover method 400 includes:

[0232] S410: The original cell network equipment sends the conditional Layer 1 / 2 triggered LTM mobility handover configuration information to the terminal equipment.

[0233] It should be understood that the specific form of the original community network equipment and terminal equipment can be referred to the above-mentioned relevant descriptions, and will not be repeated here.

[0234] The following provides a detailed explanation of the configuration switching process.

[0235] This handover configuration information is used to configure candidate cells to perform conditional LTM cell handover when the execution conditions are met.

[0236] Therefore, the LTM cell handover configured in the switching configuration information is the cell handover strategy adopted by the terminal device when it evaluates a candidate cell that meets the execution conditions.

[0237] It should be understood that the above execution conditions are the basis used by the terminal device to evaluate whether a candidate cell can be used as a target cell, and for the configuration of execution conditions, one or more can be configured for each candidate cell, which is not specifically limited in this embodiment. The candidate cell can be called an LTM candidate cell, and the target cell can be called an LTM target cell.

[0238] It should also be understood that the decision-making device in this condition differs from that in related technologies. In this condition, the terminal device evaluates candidate cells to determine the target cell and then performs a cell handover. In other words, the difference between this conditional LTM and related technologies is that the original cell network equipment no longer selects and indicates the target cell to the terminal device. Instead, the terminal device evaluates the cells to determine whether a cell handover should be performed and actively selects the target cell.

[0239] It should be noted that there may be one or more candidate cells, and the execution conditions used for different candidate cells may be the same or different. This application does not limit this.

[0240] It should be understood that the specific form of the handover configuration information can be any form that represents "conditional LTM cell handover when the execution conditions are met", such as numbers, fields or other forms, and this application does not limit it.

[0241] This embodiment does not limit the transmission method for switching configuration information.

[0242] In one example, the switching configuration information can be carried in the Radio Resource Control (RRC) reconfiguration information.

[0243] Specifically, when sending the measurement information of candidate cells to the terminal device via RRC reconfiguration information, the handover configuration information can be sent to the terminal device together. In this case, the handover configuration information can be a predefined field in the RRC reconfiguration information. Therefore, the terminal device can obtain the handover configuration information at the same time as obtaining the measurement information of candidate cells via RRC reconfiguration information, which can effectively avoid the waste of communication resources.

[0244] In another example, the handover configuration information can be carried in dedicated signaling. That is, in this embodiment of the application, the handover configuration information can be sent to the terminal device as an independent signaling message through the original cell network equipment, and sent to the terminal device together with the RRC reconfiguration information, which can improve the parsing speed of the handover configuration information. Here, "sent together" can be a point in time or a period of time, and this application does not limit it in this way.

[0245] S420. If a candidate cell that meets the execution conditions is evaluated, the beam of the candidate cell that meets the execution conditions is used to access the target cell to complete the cell handover.

[0246] Specifically, the terminal device receives LTM handover configuration information based on the conditions sent by the original cell network device, and evaluates candidate cells according to the execution conditions. After evaluating and finding candidate cells that meet the execution conditions, the terminal device determines the beam of the candidate cell that meets the execution conditions, and then uses the beam of the candidate cell that meets the execution conditions to access the target cell.

[0247] Therefore, the original cell network equipment configures the candidate cell to perform conditional LTM cell handover when the execution conditions are met by switching configuration information. This allows the terminal equipment to use the beam of the candidate cell that meets the execution conditions to access the target cell when it evaluates a candidate cell that meets the execution conditions, instead of being triggered by the network equipment and immediately performing the handover, thus improving the handover robustness.

[0248] It should be understood that the switching configuration information may include the execution condition information and the LTM configuration information of each candidate cell. When the execution condition information is different, the corresponding execution conditions are different, and the candidate cells that meet the execution conditions are also different. Furthermore, the original cell network device can configure corresponding execution condition information for each candidate cell, or it can configure unified execution condition information for all candidate cells. This application embodiment does not specifically limit this.

[0249] Therefore, the following section describes the execution condition information. This execution condition information includes at least one of the following:

[0250] (1) First condition LTM execution event.

[0251] (2) Second condition LTM execution condition information.

[0252] In other words, the execution condition information can be a first condition LTM execution event, the execution condition information can be a second condition LTM execution condition information, or the execution condition information can be a first condition LTM execution event and a second condition LTM execution condition information. It should be understood that the execution condition information may also include other items besides the first condition LTM execution event and the second condition LTM execution condition information. The embodiments of this application do not specifically limit the content of the execution condition information.

[0253] It should be understood that the first conditional LTM execution event is an event in which the beam-corresponding measurement quality of the candidate cell is higher than that of the original cell. The second conditional LTM execution condition information can be understood as the information required to form the second conditional LTM execution conditions. This information includes a first threshold value set for the beam-corresponding measurement quality of the candidate cell and a second threshold value set for the beam-corresponding measurement quality of the original cell. The second conditional LTM execution conditions are different from the first conditional LTM execution event.

[0254] It should be understood that the aforementioned first condition LTM execution event and / or second condition LTM execution condition information can constitute the execution condition information corresponding to each candidate cell, and different execution condition information represents different execution conditions. It should also be understood that a candidate cell can correspond to one or more execution conditions, and different candidate cells can correspond to the same or different execution condition information; this embodiment does not impose any limitations on this.

[0255] It should also be understood that the specific form of the first condition LTM execution event can be any form representing "the beam-corresponding measurement quality of the candidate cell is higher than that of the original cell," such as numbers, fields, or other forms, and this application does not limit this. Similarly, the specific form of the second condition LTM execution condition information can be any form representing "the first threshold value set for the beam-corresponding measurement quality of the candidate cell and the second threshold value set for the beam-corresponding measurement quality of the original cell," such as numbers, fields, or other forms, and this application does not limit this.

[0256] The LTM configuration information for the above conditions includes: the duration for which the target cell is attempted to be accessed via the selected beam.

[0257] It should be understood that conditional LTM configuration information can be interpreted as configuration information used to implement conditional LTM cell handover. Furthermore, the duration of the attempt to access the target cell via the selected beam is less than the corresponding timing duration of the timeout timer T304.

[0258] It should also be understood that, according to the 3GPP specification, the initial value of the timeout timer T304 is 6 seconds, and this value can be modified and configured to adapt to the needs of different network scenarios. Therefore, the "duration of attempting to access the target cell via the selected beam" can be any value less than 6 seconds, such as 50 milliseconds, 100 milliseconds, etc.; it can also be adaptively modified when the timeout timer T304 is modified and configured. This timing duration for attempting to access the target cell controls the access operation in "using the beam of a candidate cell that meets the execution conditions to access the target cell". If access is unsuccessful within the timing duration of the attempt to access the target cell, beam reselection can be initiated in a timely manner, and then the reselected beam can be used to re-access the target cell. This avoids the phenomenon of low cell handover efficiency caused by excessively long access operation time for the same beam, thus improving the cell handover success rate and efficiency.

[0259] It should be noted that the specific representation of the duration of the attempt to access the target cell via the selected beam can be any form representing "the duration of the attempt to access the target cell via the selected beam," such as a number, a field, or other forms, and this application does not limit this. For example, its specific representation may be the field "Try-Timer" or "Txxx," and this application embodiment does not specifically limit this.

[0260] It should also be understood that conditional LTM configuration information can be configured together with the execution condition information corresponding to each candidate cell. That is, for conditional LTM cell handover, the original cell network equipment will configure the configuration information of the candidate cells and the conditional LTM configuration information. The conditional LTM configuration information may include the duration of the attempt to access the target cell through the selected beam, and the configuration information of the candidate cells may include the execution condition information corresponding to each candidate cell, and may also include the measurement information of each candidate cell. Configuring them together can reduce signaling overhead.

[0261] The following is a detailed explanation of each item in the execution condition information:

[0262] As mentioned above, the first conditional LTM execution event is the event where the beam-corresponding measurement quality of the candidate cell is higher than that of the original cell, and the beam-corresponding measurement quality of both types of cells can include any one of the following: the average of N better beam-corresponding measurement qualities, any beam-corresponding measurement quality, or at least one beam-corresponding measurement quality. Therefore, (1) the first conditional LTM execution event includes any one of the following:

[0263] (11) The mean of the measurement quality of the N better beams of the candidate cell is greater than or equal to the measurement quality of any beam of the original cell, where N is an integer greater than 1.

[0264] (12) The measurement quality of any beam in the candidate cell is greater than or equal to the measurement quality of any beam in the original cell.

[0265] (13) The candidate cell has at least one beam whose measurement quality is greater than or equal to the measurement quality of any beam in the original cell.

[0266] (14) The candidate cell has at least one beam whose measurement quality is greater than or equal to that of at least one beam in the original cell.

[0267] (15) The mean of the measurement quality of the N better beams of the candidate cell is greater than or equal to the measurement quality of the N better beams of the original cell, where N is an integer greater than 1.

[0268] In other words, each of the above LTM execution events can be understood as its corresponding execution condition, and different execution conditions correspond to different execution standards.

[0269] In the LTM execution event of condition (11), "any beam of the original cell" can be understood as each beam in the original cell. Therefore, the LTM execution event of condition (11) is: the average measurement quality of the N superior beams of the candidate cell is greater than or equal to the measurement quality of each beam in the original cell. It should be understood that the beams of the candidate cell can be sorted in order of measurement quality from high to low or from low to high. Taking the beams of the candidate cell sorted in order of measurement quality from high to low as an example, the "N superior beams of the candidate cell" are explained as follows: the N superior beams of the candidate cell can be the N beams selected from the first position among all the beams of the candidate cell, or the N beams selected from the second position after the first position. It should be noted that the N beams can be arranged continuously, or arranged at intervals, or other arrangements. The embodiments of this application do not specifically limit the position and arrangement of the N beams. It should be understood that the embodiments of this application do not specifically limit the value of N; for example, N can be equal to 2 or 3. It should also be understood that the mean can be an arithmetic mean or a weighted average. Therefore, the embodiments of this application do not specifically limit the type of mean.

[0270] In condition (12), "any beam of the candidate cell" can be understood as every beam in the candidate cell. Therefore, condition (12) means that every beam in the candidate cell must be greater than or equal to the measurement quality corresponding to every beam in the original cell. Thus, compared with the execution condition corresponding to condition (11), the execution standard of condition (12) is higher.

[0271] In condition (13) of the LTM execution event, "at least one" can be understood as one or more, and any beam of the original cell can be understood as each beam in the original cell. Therefore, condition (13) of the LTM execution event is: the candidate cell has one or more beams whose corresponding measurement quality is greater than or equal to the measurement quality corresponding to each beam of the original cell. Therefore, compared with the execution conditions corresponding to condition (12) above, the execution standard corresponding to condition (13) is lower.

[0272] In condition (14), "at least one" can also be understood as one or more. Therefore, condition (14) is: the candidate cell has one or more beams whose measurement quality is greater than or equal to the measurement quality of one or more beams in the original cell. Therefore, compared with the execution condition corresponding to condition (13), the execution standard of condition (14) is lower.

[0273] In conditional LTM execution event (15), since N is an integer greater than 1, conditional LTM execution event (15) is: the mean of the measurement quality corresponding to the N superior beams of the candidate cell is greater than or equal to the measurement quality corresponding to multiple superior beams in the original cell. It should be understood that the description of "N superior beams of the original cell" is similar to the description of "N superior beams of the candidate cell" above, that is: the beams of the original cell can be sorted according to the measurement quality values ​​from high to low or from low to high. Taking the sorting of beams in the original cell according to their measurement quality values ​​from highest to lowest as an example, the "N superior beams of the original cell" are explained as follows: The N superior beams of the original cell can be the N beams selected from the top of the original cell based on their measurement quality, or the N beams selected from the second-to-last beam. It should be noted that these N beams can be arranged continuously, intermittently, or in other arrangements. This application embodiment does not specifically limit the position or arrangement of the N beams. It should be understood that this application embodiment does not specifically limit the value of N; for example, N can be 2 or 3. It should also be understood that the mean can be an arithmetic mean or a weighted average. Therefore, this application embodiment does not specifically limit the type of mean.

[0274] It should be noted that the determination methods for "N superior beams of the original cell" and "N superior beams of the candidate cell" can be the same or different. For example, "N superior beams of the candidate cell" are the N beams with the highest corresponding measurement quality selected from the first position in the candidate cell, and "N superior beams of the original cell" are also the N beams with the highest corresponding measurement quality selected from the first position in the original cell. Alternatively, "N superior beams of the candidate cell" can be the N beams with the highest corresponding measurement quality selected from the first position in the candidate cell, and "N superior beams of the original cell" are the N beams with the highest corresponding measurement quality selected from the second position after the first position in the original cell. Therefore, the determination methods for superior beams of different cells are optional. It should also be understood that the execution standard corresponding to item (15) is higher than that corresponding to item (14) above, but lower than that corresponding to item (11) above.

[0275] It should be understood that the specific content of different first-condition LTM execution events varies. Therefore, the embodiments of this application do not specifically limit the specific content of the first-condition LTM execution event. That is, a first-condition LTM execution event containing any one of the contents can provide the corresponding execution conditions, thereby enabling the terminal device to effectively evaluate candidate cells. This improves the selectivity of execution condition information.

[0276] It should also be understood that, unlike CHO, in conditional LTM, the execution condition information can include information about a first conditional LTM execution event, which can form beam-level execution conditions.

[0277] It should be noted that when the execution condition information includes the first condition LTM execution event, after receiving the execution condition information, the terminal device needs to obtain the beam measurement quality of the candidate cell and the original cell in the corresponding items above in order to evaluate the candidate cell based on the execution condition information. Therefore, under conditional LTM, the beam measurement quality of the candidate cell and the original cell in the corresponding items above can be obtained based on the Channel-State-Information Reference Signal (CSI-RS) or based on the Synchronization Signal and PBCH block (SSB). This application embodiment does not specifically limit the method of obtaining the beam measurement quality of each cell's corresponding item. The relevant explanations of CSI-RS and SSB can be found in related technologies and will not be repeated here.

[0278] It should be noted that the specific form of the LTM execution event for each of the above conditions can be any form representing the corresponding execution condition, such as a number, a field, or other forms, and this application does not limit this.

[0279] In one example, the specific representation of each conditional LTM execution event can be two fields: (11) The conditional LTM execution event is represented by two fields: “Cell1-N-average” and “Cell0-all”. The “Cell1-N-average” field represents the average measurement quality of the N better beams of the candidate cell; the “Cell0-all” field represents the measurement quality of any beam of the original cell. (12) The conditional LTM execution event is represented by two fields: “Cell1-all” and “Cell0-all”. The “Cell1-all” field represents the measurement quality of any beam of the candidate cell; the “Cell0-all” field represents the measurement quality of any beam of the original cell. (13) The conditional LTM execution event is represented by two fields: “Cell1-At least one” and “Cell0-all”. The “Cell1-At least one” field represents the measurement quality of at least one beam of the candidate cell; the “Cell0-all” field represents the measurement quality of any beam of the original cell. (14) The LTM execution event for conditional ...

[0280] In another example, if the terminal device pre-stores the definitions of each first conditional LTM execution event, the specific representation of each conditional LTM execution event is as follows: (11) The representation of a conditional LTM execution event can be two fields. The first field, “condition LTM event11”, indicates the type of the first conditional LTM execution event to which it belongs, and the second field, “N”, indicates the number N of the superior beams of the candidate cell. (12) The representation of a conditional LTM execution event can be one field, “condition LTM event12”, which indicates the type of the first conditional LTM execution event to which it belongs. Similarly, (13) The representation of a conditional LTM execution event can be one field, “condition LTM event13”, which indicates the type of the first conditional LTM execution event to which it belongs. (14) The representation of a conditional LTM execution event can be one field, “condition LTM event14”, which indicates the type of the first conditional LTM execution event to which it belongs. (15) The LTM execution event of the condition can be represented by three fields. The first field, “condition LTM event15”, indicates the type of the first condition LTM execution event to which it belongs. The second field, “N1”, indicates the number of better beams N of the candidate cell. The third field, “N0”, indicates the number of better beams N of the original cell.

[0281] It should be understood that the specific manifestations of different conditional LTM execution events can be the same or different, and the embodiments of this application do not limit this. Different manifestations of conditional LTM execution events, on the one hand, enable the original cell network equipment to evaluate candidate cells when the terminal equipment has pre-stored the definitions of each first conditional LTM execution event, while reducing communication resources; on the other hand, even when the terminal equipment has not pre-stored the definitions of each first conditional LTM execution event, it can still evaluate candidate cells, improving the universality of conditional LTM.

[0282] As mentioned earlier, the second conditional LTM execution condition information includes a first threshold value set for the beam-corresponding measurement quality of the candidate cell and a second threshold value set for the beam-corresponding measurement quality of the original cell. Therefore, each threshold value is explained below:

[0283] It should be understood that the first threshold value is used to indicate the threshold value of the measurement quality corresponding to the beam when the candidate cell meets the execution conditions. Therefore, the first threshold value includes any one of the following:

[0284] (21) The first threshold is the threshold value when there are K better beams in the candidate cell and the measurement quality is greater than or equal to that of all of them. K is an integer greater than or equal to 1.

[0285] (22) The first threshold is the threshold value at which the measurement quality of any beam in the candidate cell is greater than or equal to the threshold value.

[0286] (23) The first threshold is the threshold value at which the mean of the measurement quality of M better beams in the candidate cell is greater than or equal to that of the candidate cell, where M is an integer greater than 1.

[0287] It should also be understood that the second threshold value is used to indicate the threshold value of the beam's corresponding measurement quality when the original cell meets the execution conditions. The second threshold value includes any one of the following:

[0288] (24) The second threshold is the threshold value when there are L better beams in the original cell whose corresponding measurement quality is less than or equal to the threshold value, where L is an integer greater than or equal to 1.

[0289] (25) The second threshold is the threshold value at which the measurement quality of any beam in the original cell is less than or equal to the threshold value.

[0290] (26) The second threshold is the threshold value at which the mean of the measurement quality of the P better beams in the original cell is less than or equal to the threshold value, where P is an integer greater than 1.

[0291] It should be understood that the first threshold value can be any of the different threshold values ​​set for the beam-corresponding measurement quality of the candidate cell; the second threshold value can also be any of the different threshold values ​​set for the beam-corresponding measurement quality of the original cell. Therefore, different combinations of the first threshold value and the second threshold value can form different execution condition information, and different execution condition information can correspond to different execution conditions.

[0292] It should be understood that the specific content of different first threshold values ​​is different, and the specific content of different second threshold values ​​is also different. Therefore, the embodiments of this application do not specifically limit the specific content of the first threshold value or the second threshold value. That is, a combination of a first threshold value containing any one of the contents and a second threshold value containing any one of the contents can provide corresponding execution conditions, thereby enabling the terminal device to effectively evaluate candidate cells. This improves the selectivity of execution condition information.

[0293] It should also be understood that, unlike CHO, in conditional LTM, the execution condition information can include information including a first threshold value and a second threshold value, which can form a beam-level execution condition.

[0294] It should be noted that when the execution condition information includes the second condition LTM execution condition information, after receiving the execution condition information, the terminal device needs to obtain the beam measurement quality of the candidate cell in the corresponding first threshold value and the original cell in the corresponding first threshold value in order to evaluate the candidate cell based on the execution condition information. Therefore, under conditional LTM, the beam measurement quality of each cell in the above threshold values ​​can be obtained based on the Channel State Indication Reference Signal (CSI-RS) or based on the Synchronization Signal Block (SSB). This application embodiment does not specifically limit the method of obtaining the beam measurement quality of each cell. The relevant explanations of CSI-RS and SSB can be found in related technologies and will not be repeated here.

[0295] It should be understood that the first threshold value type of the candidate cell corresponding item can be the same as or different from the second threshold value type. For example, the terminal device obtains the measurement quality corresponding to any beam in the candidate cell for the candidate cell, and the terminal device obtains the measurement quality corresponding to any beam in the original cell for the original cell; or, the terminal device obtains the measurement quality corresponding to any beam in the candidate cell for the candidate cell, and the terminal device obtains the measurement quality corresponding to L better beams in the original cell for the original cell.

[0296] It should be noted that the specific form of each threshold value corresponding to each of the above-mentioned communities can be any form representing the corresponding execution conditions, such as numbers, fields or other forms, and this application does not limit this.

[0297] In one example, the specific representation of each first threshold value is a single field: (21) The first threshold value of item 1 is represented by the field: "Cell1-K". (22) The first threshold value of item 2 is represented by the field: "Cell1-all". (23) The first threshold value of item 2 is represented by the field: "Cell1-M-average". Similarly, the specific representation of each second threshold value is a single field: (24) The second threshold value of item 2 is represented by the field: "Cell0-K". (25) The second threshold value of item 2 is represented by the field: "Cell0-all". (26) The second threshold value of item 2 is represented by the field: "Cell0-M-average".

[0298] In another example, where the terminal device pre-stores the definitions of each first threshold value and each second threshold value, the specific representation of each first threshold value is a single field: (21) The first threshold value is represented by the field "threshold21". (22) The first threshold value is represented by the field "threshold22". (23) The first threshold value is represented by the field "threshold23". Similarly, the specific representation of each second threshold value is a single field: (24) The second threshold value is represented by the field "threshold24". (25) The second threshold value is represented by the field "threshold25". (26) The second threshold value is represented by the field "threshold26".

[0299] In another example, the first threshold value of item (21) is represented as the field: "L1-RSRP". The other threshold values ​​are represented in a similar way, and will not be described in detail here.

[0300] Therefore, the specific manifestations of different first threshold values ​​can be the same or different, and the specific manifestations of different second threshold values ​​can be the same or different, and this application embodiment does not limit this. Different manifestations of first and second threshold values, on the one hand, enable the original cell network equipment to evaluate candidate cells when the terminal equipment has pre-stored the definitions of each first and second threshold value, while reducing communication resources; on the other hand, even when the terminal equipment has not pre-stored the definitions of each first and second threshold value, it can still evaluate candidate cells, improving the universality of conditional LTM.

[0301] As mentioned earlier, execution condition information can be a first-condition LTM execution event and a second-condition LTM execution condition. Therefore, the following is a description of execution condition information that includes both the first-condition LTM execution event and the second-condition LTM execution condition information:

[0302] The execution condition information may simultaneously include any one of the conditional LTM execution events from (11) to (15), any one of the first threshold values ​​from (21) to (23), and any one of the second threshold values ​​from (24) to (26). Since both the first conditional LTM execution event and the second execution condition information are selective, the execution condition information including the above "any one of the conditional LTM execution events from (11) to (15), any one of the first threshold values ​​from (21) to (23), and any one of the second threshold values ​​from (24) to (26)," as well as the execution condition corresponding to the execution condition information, are all selective.

[0303] The above explains the specific content of the handover configuration information. Furthermore, regarding the transmission method of the handover configuration information, as mentioned earlier, it can be carried in Radio Resource Control (RRC) reconfiguration information or proprietary signaling, and will not be elaborated further.

[0304] It should be noted that different execution condition information corresponds to different execution conditions. Therefore, after receiving different execution condition information, the terminal device evaluates the candidate cells that meet the different execution conditions.

[0305] After receiving the execution condition information, the terminal device evaluates candidate cells that meet the execution conditions, including: candidate cells that meet the first condition LTM execution event; or, candidate cells that meet both the first threshold and the second threshold; or candidate cells that meet both the first condition LTM execution event and the first and second thresholds. Therefore, there are three types of candidate cells that meet the execution conditions, and the following describes each type of "candidate cell that meets the execution conditions".

[0306] (i) The following analysis is performed on candidate cells that meet the first condition for LTM execution events:

[0307] It should be understood that when there are multiple first-condition LTM execution events, and the execution condition information includes any one of the first-condition LTM execution events, the execution condition information containing different first-condition LTM execution events corresponds to different candidate cells that meet the execution conditions; therefore, the evaluated candidate cells that meet the first-condition LTM execution events may include any of the following:

[0308] (31) Candidate cells whose average measurement quality of N superior beams is greater than or equal to the measurement quality of any beam of the original cell.

[0309] (32) Candidate cells whose measurement quality corresponding to any beam is greater than or equal to the measurement quality corresponding to any beam of the original cell.

[0310] (33) There exists a candidate cell whose measurement quality is greater than or equal to that of any beam of the original cell.

[0311] (34) There exists a candidate cell whose measurement quality is greater than or equal to that of at least one beam of the original cell.

[0312] (35) Candidate cells whose average measurement quality of the N better beams is greater than or equal to the measurement quality of the N better beams of the original cell.

[0313] Therefore, when the execution condition information includes different first-condition LTM execution events, the terminal device can evaluate candidate cells that satisfy different first-condition LTM execution events. This increases the selectivity of candidate cells by providing a range of candidate cells that meet different first-condition LTM execution conditions.

[0314] (II) For candidate cells that meet both the first and second thresholds, the following analysis is performed:

[0315] It should also be understood that when there are multiple first threshold values ​​and multiple second threshold values, and the execution condition information includes any one of the first threshold values ​​and any one of the second threshold values, execution condition information containing different first threshold values ​​and / or different second threshold values ​​corresponds to different candidate cells that meet the execution conditions; therefore, the evaluated candidate cells that meet both the first threshold value and the second threshold value may include any of the following:

[0316] (41) When there are L better beams in the original cell whose measurement quality is less than or equal to the second threshold, there are K better beams whose measurement quality is greater than or equal to the first threshold.

[0317] (42) When there are L better beams in the original cell whose measurement quality is less than or equal to the second threshold, the candidate cell whose measurement quality is greater than or equal to the first threshold is any beam.

[0318] (43) When there are L better beams in the original cell whose measurement quality is less than or equal to the second threshold, there are M better beams whose average measurement quality is greater than or equal to the first threshold.

[0319] (44) When the measurement quality of any beam in the original cell is less than or equal to the second threshold, there are K candidate cells with better beams whose measurement quality is greater than or equal to the first threshold.

[0320] (45) When the measurement quality corresponding to any beam in the original cell is less than or equal to the second threshold, the candidate cell whose measurement quality corresponding to any beam is greater than or equal to the first threshold.

[0321] (46) When the measurement quality of any beam in the original cell is less than or equal to the second threshold, there are M candidate cells whose average measurement quality of the better beam is greater than or equal to the first threshold.

[0322] (47) When there are P better beams in the original cell whose average measurement quality is less than or equal to the threshold value, there are K better beams whose measurement quality is greater than or equal to the first threshold value.

[0323] (48) When there are P better beams in the original cell whose mean measurement quality is less than or equal to a threshold value, the candidate cell whose measurement quality is greater than or equal to the first threshold value is selected.

[0324] (49) When there are P better beams in the original cell whose mean measurement quality is less than or equal to the threshold value, there are M better beams whose mean measurement quality is greater than or equal to the first threshold value as candidate cells.

[0325] Therefore, when the execution condition information includes different second condition LTM execution condition information, the terminal device can evaluate candidate cells that meet different first threshold values ​​and / or different second threshold values, and the candidate cells that meet different first threshold values ​​and / or different second threshold values ​​improve the selectivity of candidate cells.

[0326] (III) The following analysis is performed on candidate cells that simultaneously meet the first condition for LTM execution events and meet both the first and second thresholds:

[0327] It should also be understood that when there are multiple first condition LTM execution events, multiple first threshold values, and multiple second threshold values, and the execution condition information includes any one first condition LTM execution event, any one first threshold value, and any one second threshold value, execution condition information containing different first condition LTM execution events and different first threshold values ​​and / or different second threshold values ​​corresponds to different candidate cells that meet the execution conditions. Therefore, the evaluated candidate cells that meet the first condition LTM execution events and meet both the first and second threshold values ​​may include any one of the following: candidate cells that simultaneously meet any one of (11) to (15) and any one of (21) to (23) and any one of (24) to (26).

[0328] In one example, a candidate cell that simultaneously satisfies (11), (21), and (24) is a candidate cell where, when the measurement quality of L superior beams in the original cell is less than or equal to the second threshold, the average measurement quality of N superior beams is greater than or equal to the measurement quality of any beam in the original cell, and the measurement quality of K superior beams is greater than or equal to the first threshold. In another example, a candidate cell that simultaneously satisfies (12), (22), and (25) is a candidate cell where, when the measurement quality of any beam in the original cell is less than or equal to the second threshold, the measurement quality of any beam in the original cell is greater than or equal to the measurement quality of any beam in the original cell, and the measurement quality of any beam in the original cell is greater than or equal to the first threshold.

[0329] Therefore, when the execution condition information includes different first-condition LTM execution events and / or different second-condition LTM execution condition information, the terminal device can evaluate candidate cells that satisfy different first-condition LTM execution events and different first threshold values ​​and / or different second threshold values. Thus, the availability of candidate cells that satisfy different first-condition LTM execution events and different first threshold values ​​and / or different second threshold values ​​increases the selectivity of candidate cells. Furthermore, different types of candidate cells further enhance the selectivity of candidate cells.

[0330] It should be understood that after evaluating candidate cells that meet the execution conditions, the terminal device can execute a beam determination scheme. Since there are three types of candidate cells that meet the execution conditions, the terminal can execute the corresponding beam determination scheme when evaluating a candidate cell of one type. Specifically: if a candidate cell that meets the execution conditions is one that satisfies the first condition LTM execution event, beam determination scheme one is executed; if a candidate cell that meets the execution conditions is one that satisfies both the first and second thresholds, beam determination scheme two is executed; and if a candidate cell that meets the execution conditions is one that satisfies both the first and second thresholds, beam determination scheme three is executed.

[0331] One beam determination scheme is as follows: If there is only one beam representing a candidate cell that satisfies the first condition LTM execution event, then the beam representing the candidate cell that satisfies the execution condition is that beam. Alternatively, if there are multiple beams representing candidate cells that satisfy the first condition LTM execution event, then the beam representing the candidate cell that satisfies the execution condition is any one of the beams representing a candidate cell that satisfies the first condition LTM execution event, or the beam representing a candidate cell that satisfies the first condition LTM execution event with higher measurement quality.

[0332] The second beam determination scheme is as follows: If there is only one beam representing a candidate cell that satisfies both the first and second thresholds, then the beam representing the candidate cell that meets the execution conditions is that beam representing the candidate cell that satisfies both the first and second thresholds. Alternatively, if there are multiple beams representing candidate cells that satisfy both the first and second thresholds, then the beam representing the candidate cell that meets the execution conditions is any one of the beams representing candidate cells that satisfy both the first and second thresholds, or the beam representing the candidate cell with the higher measurement quality that satisfies both the first and second thresholds.

[0333] The beam determination scheme three is as follows: If there is only one beam that satisfies the first condition LTM execution event and the candidate cell that satisfies both the first and second thresholds, then the beam of the candidate cell that satisfies the execution conditions is the beam of the candidate cell that satisfies both the first and second thresholds; or, if there are multiple beams that satisfy the first condition LTM execution event and the candidate cell that satisfies both the first and second thresholds, then the beam of the candidate cell that satisfies the execution conditions is any one of the beams of the candidate cell that satisfies both the first and second thresholds or the beam of the candidate cell that satisfies both the first and second thresholds with the higher measurement quality.

[0334] Therefore, the beams of candidate cells that meet the execution conditions are: any first beam or the first beam with higher measurement quality. Specifically, the first beam is either the beam of a candidate cell that meets the first condition LTM execution event, or the beam of a candidate cell that meets both the first and second thresholds, or the beam of a candidate cell that meets both the first condition LTM execution event and the first and second thresholds.

[0335] Therefore, when different execution condition information corresponds to the same or different types of "candidate cells that meet the execution conditions", the terminal device can determine the beam of the "candidate cell that meets the execution conditions" and then use the beam of the candidate cell that meets the execution conditions to access the target cell to complete the cell handover, thereby improving the universality of cell handover.

[0336] It should be noted that since there are three types of candidate cells that meet the execution conditions, the terminal device can also execute the corresponding beam determination scheme when multiple candidate cells are evaluated. That is, when there are multiple types of candidate cells that meet the execution conditions, beam determination scheme four is executed.

[0337] The fourth beam determination scheme is as follows: different priorities are configured for different types of candidate cells, and then the candidate cells with higher priority that meet the execution conditions are selected from the candidate cells that meet the execution conditions, and then the beam of the candidate cell with higher priority that meets the execution conditions is selected.

[0338] In one example, the priority of "candidate cells that satisfy the first condition LTM execution event and meet both the first and second thresholds" is one; the priority of "candidate cells that meet both the first and second thresholds" is two; and the priority of "candidate cells that satisfy the first condition LTM execution event" is three. Priority one is higher than priority two, and priority two is higher than priority three. Under this priority configuration, the candidate cells that meet the execution conditions are determined by priority. The candidate cell with the highest priority that meets the execution conditions is selected, and then the beam of the candidate cell with the highest priority that meets the execution conditions is selected. After selecting the "candidate cell with the highest priority that meets the execution conditions," the subsequent description of this beam determination scheme four is similar to the descriptions of the three beam determination schemes above, all analyzing cases with different numbers of beams, and will not be repeated here.

[0339] Therefore, when different execution condition information corresponds to the same or different types of "candidate cells that meet the execution conditions", the terminal device can determine the beam of the "candidate cell that meets the execution conditions" and then use the beam of the candidate cell that meets the execution conditions to access the target cell to complete the cell handover, thereby improving the universality of cell handover.

[0340] It should be understood that after determining the beams of the "candidate cells that meet the execution conditions" using the beam determination scheme, if there are multiple first beams, then in S420, the beams of the candidate cells that meet the execution conditions are used to access the target cell to complete the cell handover, including the following steps:

[0341] S4211. When accessing the target cell using any first beam or a first beam with higher measurement quality, start the first timer and timeout timer T304. The first timer is the timer corresponding to the duration of the attempt to access the target cell through the selected beam.

[0342] It should be understood that the first timer and the timeout timer T304 can be hardware with the same or different structures, and this application embodiment does not specifically limit this. The first timer can be started when accessing the target cell using a beam corresponding to a target TCI status identifier, or when a "candidate cell that meets the execution conditions" is evaluated. This application embodiment does not specifically limit the start time.

[0343] S4212. If the target cell is successfully accessed before the first timer expires, the cell handover is completed.

[0344] S4213. If the target cell is not successfully accessed before the first timer expires and T304 has not expired, another first beam is used to access the target cell and the first timer is restarted until T304 expires or the target cell is successfully accessed.

[0345] In one example, when the terminal device evaluates a "candidate cell that satisfies the first condition LTM execution event" and there are multiple beams of the "candidate cell that satisfies the first condition LTM execution event", the terminal device can use the beam with the higher measurement quality among the multiple beams to access the target cell. When accessing, the terminal device starts a first timer and a timeout timer T304. If the terminal device successfully accesses the target cell before the first timer expires, the cell handover is completed. If the terminal device fails to access the target cell before the first timer expires and T304 has not expired, it uses another first beam to access the target cell and restarts the first timer until T304 expires or the terminal device successfully accesses the target cell.

[0346] In another example, when the terminal device evaluates a "candidate cell that meets both the first threshold and the second threshold", and there are multiple beams for the "candidate cell that meets both the first threshold and the second threshold", the terminal device can use the beam with the higher measurement quality among the multiple beams to access the target cell. When accessing, the terminal device starts the first timer and the timeout timer T304. If the terminal device successfully accesses the target cell before the first timer expires, the cell handover is completed. If the terminal device fails to access the target cell before the first timer expires and T304 has not expired, it uses another first beam to access the target cell and restarts the first timer until T304 expires or the terminal device successfully accesses the target cell.

[0347] In another example, when the terminal device evaluates a candidate cell that "meets the first condition LTM execution event and meets the first threshold and the second threshold", and there are multiple beams of the "candidate cell that meets the first condition LTM execution event and meets the first threshold and the second threshold", the terminal device can use the beam with the higher measurement quality among the multiple beams to access the target cell. When accessing, the terminal device starts the first timer and the timeout timer T304. If the terminal device successfully accesses the target cell before the first timer expires, the cell handover is completed. If the terminal device fails to access the target cell before the first timer expires and T304 has not expired, it uses another first beam to access the target cell and restarts the first timer until T304 expires or the terminal device successfully accesses the target cell.

[0348] It should be understood that the timing duration of the attempt to access the target cell controls the access operation corresponding to "using any first beam or the first beam with higher measurement quality to access the target cell". If the access to the target cell is not successful before the first timer expires and T304 does not expire, it means that the access to the target cell was not successful within the timing duration of the attempt to access the target cell. The beam reselection can be initiated in time, and the reselected beam can be used to re-access the target cell. This avoids the phenomenon of low cell handover efficiency caused by the access operation time corresponding to the same beam being too long, thus improving the cell handover success rate and efficiency.

[0349] It should be noted that during the cell handover process executed by the terminal device, there may be instances where the original cell network device sends MAC CE signaling. In this case, the MAC CE signaling includes the activated transmission configuration index (TCI) status identifier corresponding to the candidate cell, and there is a correspondence between the activated transmission configuration index (TCI) status identifier and the beam. Therefore, after the terminal device evaluates a candidate cell that meets the execution conditions according to the above cell handover method, in addition to determining the beam of the candidate cell that meets the execution conditions through the beam determination scheme in the above cell handover method, it can also determine the beam of the candidate cell that meets the execution conditions based on the MAC CE signaling, thus improving the selectivity of the beam determination scheme. However, in this case, if two beam determination schemes are used simultaneously, there may be inconsistencies in the determined beams. To avoid inconsistencies in the determined beams caused by using two beam determination schemes simultaneously, this application embodiment sets a priority for different beam determination schemes in this case. For example, the beam determination scheme based on MAC CE signaling has a higher priority than the beam determination scheme based on the above cell handover method. Therefore, if the beam determination is based on the higher priority beam determination scheme, there will be no situation where the determined beams are inconsistent due to the simultaneous use of two beam determination schemes.

[0350] It should be understood that when the beam determination scheme based on MAC CE signaling has a higher priority than the beam determination scheme based on the above-described cell handover method, in order to ensure that the terminal device and the original cell network device have a consistent understanding of the activated Transmission Configuration Index (TCI) status identifier, thereby improving the cell handover success rate, the embodiments of this application can adaptively adjust the above-described cell handover method for the coexistence of the two beam determination schemes. For example, retaining some descriptions and updating some descriptions. In one example, retaining some descriptions can be understood as retaining S410, and updating some descriptions can refer to updating the descriptions of "candidate cells that meet the execution conditions" and the beam determination scheme. The adjusted cell handover method will be analyzed in detail below.

[0351] It should be understood that when the terminal device has evaluated a candidate cell that meets the execution conditions, the original cell network device sends MAC CE signaling, such as... Figure 5 As shown, the MAC CE signaling includes the activated Transmission Configuration Index (TCI) status identifiers corresponding to the candidate cell: TCI state ID 1, TCI state ID 2, ..., TCI state ID N. Each TCI state ID can also be called a TCI state identifier, used to indicate the activated TCI.

[0352] It should also be understood that when the original cell network equipment is configured with a maximum of 8 candidate cells, N is at most 8. Furthermore, the number of N and the number of configured candidate cells can be the same or different. For example, with 8 candidate cells configured, there are 8 TCI state IDs, meaning each candidate cell corresponds to one TCI state ID. Alternatively, with 3 candidate cells configured, there are 7 TCI state IDs, where some candidate cells correspond to one TCI state ID, and some candidate cells correspond to multiple TCI state IDs.

[0353] exist Figure 5 In this context, the Serving Cell ID can be the identifier of the original cell. Downlink / uplink (D / U) represents the link corresponding to the beam of a candidate cell that meets the execution conditions, used by the terminal device to access the target cell. Figure 5 The MAC signaling also includes the uplink bandwidth portion identifier (UL BWPID) and the uplink bandwidth portion identifier (DL BWP ID). Figure 5 R in the field is a reserved field, which can also be used to indicate whether the TCI state is active or deactivated. It should also be understood that each candidate cell can correspond to a P. P equals 0 to indicate that the beam corresponding to the TCI state ID of the corresponding candidate cell is used only for uplink or downlink communication; P equals 1 to indicate that the beam corresponding to the TCI state ID of the corresponding candidate cell is used for both uplink and downlink communication.

[0354] It should be noted that different execution conditions correspond to different execution conditions. Therefore, after receiving handover configuration information and MAC CE signaling that include different execution conditions, the terminal device evaluates the candidate cells that meet the different execution conditions.

[0355] After the terminal device receives the execution condition information and MAC CE signaling, the candidate cells that meet the execution conditions are determined as follows: a first candidate cell, a second candidate cell, or a third candidate cell; wherein, the first candidate cell is a candidate cell that meets the first condition LTM execution event and the MAC CE signaling includes the corresponding TCI status identifier; the second candidate cell is a candidate cell that meets the first threshold value and the second threshold value and the MAC CE signaling includes the corresponding TCI status identifier; the third candidate cell is a candidate cell that meets the first condition LTM execution event and meets the first threshold value and the second threshold value and the MAC CE signaling includes the corresponding TCI status identifier.

[0356] It should be understood that the explanations of "first condition LTM execution event", "first threshold value" and "second threshold value" have been described above and will not be repeated here.

[0357] Therefore, when a terminal device receives a MAC CE signaling message, there are three types of candidate cells that meet the execution conditions. The following is a description of each type of "candidate cell that meets the execution conditions".

[0358] (i) The following analysis is conducted on "candidate cells that meet the first condition LTM execution event and whose MAC CE signaling includes the corresponding TCI status identifier":

[0359] It should be understood that when there are multiple first-condition LTM execution events, and the execution condition information includes any one of the first-condition LTM execution events, the execution condition information containing different first-condition LTM execution events corresponds to different candidate cells that meet the execution conditions. Therefore, the evaluated "candidate cells that meet the first-condition LTM execution events and whose MAC CE signaling includes the corresponding TCI status identifier" may include any of the following:

[0360] (51) A candidate cell whose average measurement quality of N superior beams is greater than or equal to the measurement quality of any beam of the original cell and whose MAC CE signaling includes the corresponding TCI status identifier.

[0361] (52) Candidate cells whose measurement quality corresponding to any beam is greater than or equal to the measurement quality corresponding to any beam of the original cell and whose MACCE signaling includes the corresponding TCI status identifier.

[0362] (53) There exists a candidate cell whose measurement quality is greater than or equal to that of any beam in the original cell and whose MAC CE signaling includes the corresponding TCI status identifier.

[0363] (54) There exists a candidate cell whose measurement quality is greater than or equal to that of at least one beam of the original cell and whose MAC CE signaling includes the corresponding TCI status identifier.

[0364] (55) Candidate cells whose average measurement quality of the N superior beams is greater than or equal to the measurement quality of the N superior beams of the original cell and whose MAC CE signaling includes the corresponding TCI status identifier.

[0365] Therefore, when a terminal device receives MAC CE signaling, and the execution condition information includes different first-condition LTM execution events, the terminal device can evaluate candidate cells that satisfy different first-condition LTM execution events and whose MAC CE signaling includes the corresponding TCI status identifier. Thus, the selectivity of candidate cells can be improved by identifying candidate cells that satisfy different first-condition LTM execution conditions and whose MAC CE signaling includes the corresponding TCI status identifier.

[0366] (ii) The following analysis is conducted on "candidate cells that meet the first and second threshold values ​​and include the corresponding TCI status identifier in the MAC CE signaling":

[0367] It should also be understood that when there are multiple first threshold values ​​and multiple second threshold values, and the execution condition information includes any one of the first threshold values ​​and any one of the second threshold values, execution condition information containing different first threshold values ​​and / or different second threshold values ​​corresponds to different candidate cells that meet the execution conditions; therefore, the evaluated "candidate cells that meet both the first and second threshold values ​​and include the corresponding TCI status identifier in the MAC CE signaling" may include any of the following:

[0368] (61) When there are L better beams in the original cell whose measurement quality is less than or equal to the second threshold, there are K better beams whose measurement quality is greater than or equal to the first threshold and whose corresponding TCI status identifier is included in the MAC CE signaling.

[0369] (62) When there are L better beams in the original cell whose corresponding measurement quality is less than or equal to the second threshold, the candidate cell whose corresponding measurement quality is greater than or equal to the first threshold and whose corresponding TCI status identifier is included in the MAC CE signaling.

[0370] (63) When there are L superior beams in the original cell whose measurement quality is less than or equal to the second threshold, there are M superior beams whose average measurement quality is greater than or equal to the first threshold and whose corresponding TCI status identifier is included in the MAC CE signaling.

[0371] (64) When the measurement quality corresponding to any beam in the original cell is less than or equal to the second threshold, there are K candidate cells with better beams whose measurement quality is greater than or equal to the first threshold and whose corresponding TCI status identifier is included in the MAC CE signaling.

[0372] (65) When the measurement quality corresponding to any beam in the original cell is less than or equal to the second threshold, the candidate cell whose measurement quality corresponding to any beam is greater than or equal to the first threshold and whose corresponding TCI status identifier is included in the MAC CE signaling.

[0373] (66) When the measurement quality corresponding to any beam in the original cell is less than or equal to the second threshold, there are M candidate cells whose average measurement quality corresponding to better beams is greater than or equal to the first threshold and whose corresponding TCI status identifier is included in the MAC CE signaling.

[0374] (67) When there are P superior beams in the original cell whose mean measurement quality is less than or equal to a threshold value, there are K superior beams whose measurement quality is greater than or equal to the first threshold value and whose corresponding TCI status identifier is included in the MAC CE signaling.

[0375] (68) When there are P better beams in the original cell whose mean measurement quality is less than or equal to a threshold, the candidate cell whose measurement quality is greater than or equal to the first threshold and whose corresponding TCI status identifier is included in the MAC CE signaling.

[0376] (69) When there are P better beams in the original cell whose mean measurement quality is less than or equal to a threshold value, there are M better beams whose mean measurement quality is greater than or equal to the first threshold value and whose corresponding TCI status identifier is included in the MAC CE signaling.

[0377] Therefore, when the terminal device receives MAC CE signaling, and the execution condition information includes different second condition LTM execution condition information, the terminal device can evaluate candidate cells that meet different first threshold values ​​and / or meet different second threshold values ​​and whose MAC CE signaling includes the corresponding TCI status identifier, thereby improving the selectivity of candidate cells.

[0378] (III) The following analysis is conducted on "candidate cells that meet the first condition LTM execution event and meet the first and second threshold values ​​and include the corresponding TCI status identifier in the MACCE signaling":

[0379] It should also be understood that when there are multiple first condition LTM execution events, multiple first threshold values, and multiple second threshold values, and the execution condition information includes any one first condition LTM execution event, any one first threshold value, and any one second threshold value, execution condition information containing different first condition LTM execution events and different first threshold values ​​and / or different second threshold values ​​corresponds to different candidate cells that meet the execution conditions. Therefore, the evaluated "candidate cells that meet the first condition LTM execution event and meet the first and second threshold values ​​and include the corresponding TCI status identifier in the MAC CE signaling" may include any of the following: candidate cells that simultaneously meet any one of (11) to (15) and meet any one of (21) to (23) and meet any one of (24) to (26) and include the corresponding TCI status identifier in the MAC CE signaling.

[0380] In one example, a candidate cell that simultaneously satisfies (11), (21), and (24) and includes the corresponding TCI status identifier in the MAC CE signaling is: a candidate cell in which the average of the measurement quality of the N superior beams corresponding to the original cell is greater than or equal to the measurement quality of any beam in the original cell, and the measurement quality of the K superior beams corresponding to the original cell is greater than or equal to the first threshold and includes the corresponding TCI status identifier in the MAC CE signaling.

[0381] In another example, a candidate cell that simultaneously satisfies (12), (22), and (25) and includes the corresponding TCI status identifier in the MAC CE signaling is: a candidate cell whose measurement quality corresponding to any beam in the original cell is greater than or equal to the measurement quality corresponding to any beam in the original cell when the measurement quality corresponding to any beam in the original cell is less than or equal to the second threshold value, and a candidate cell whose measurement quality corresponding to any beam in the original cell is greater than or equal to the first threshold value and includes the corresponding TCI status identifier in the MAC CE signaling.

[0382] Therefore, when the execution condition information includes different first-condition LTM execution events and / or different second-condition LTM execution condition information, the terminal device can evaluate candidate cells that satisfy different first-condition LTM execution events and different first threshold values ​​and / or different second threshold values, and that include the corresponding TCI status identifier in the MAC CE signaling. Thus, candidate cells that satisfy different first-condition LTM execution events and different first threshold values ​​and / or different second threshold values, and that include the corresponding TCI status identifier in the MAC CE signaling, can improve the selectivity of candidate cells. Furthermore, different types of candidate cells further enhance the selectivity of candidate cells.

[0383] It should be understood that after evaluating candidate cells that meet the execution conditions, the terminal device can execute the beam determination scheme. Since the number of target TCI status identifiers in the MAC CE signaling can be one or more, and different beam determination schemes correspond to different numbers of target TCI status identifiers in the MAC CE signaling, the following two cases can be distinguished based on the different numbers of target TCI status identifiers in the MAC CE signaling:

[0384] Case 1: The target TCI status identifier in the MAC CE signaling is one.

[0385] Case 2: The target TCI status identifier in the MAC CE signaling is multiple.

[0386] Regarding scenario 1, the beam determination scheme is explained as follows:

[0387] It should be understood that the target TCI status identifier is the TCI status identifier corresponding to the first candidate cell, or the target TCI status identifier is the TCI status identifier corresponding to the second candidate cell, or the target TCI status identifier is the TCI status identifier corresponding to the third candidate cell.

[0388] It should also be understood that the beam determination scheme corresponding to Case 1 is: the beam of the candidate cell that meets the execution conditions is the beam corresponding to the target TCI status identifier included in the MAC CE signaling.

[0389] In other words, when there is only one target TCI status identifier in the MAC CE signaling, the corresponding beam determination scheme is: the beam of the candidate cell that meets the execution conditions is the second beam, and the second beam is the beam corresponding to the target TCI status identifier included in the MAC CE signaling.

[0390] Specifically, when there is a TCI status identifier corresponding to a candidate cell in the MAC CE signaling, the specific details of Case 1 and the corresponding beam determination scheme include:

[0391] If Case 1 is that there is a TCI status identifier corresponding to the first candidate cell in the MAC CE signaling, and the number of such TCI status identifiers is one, then the corresponding beam determination scheme is: the beam of the "candidate cell that meets the execution conditions" is the beam corresponding to the TCI status identifier of the first candidate cell.

[0392] Alternatively, if Case 1 is that there is a TCI status identifier corresponding to the second candidate cell in the MAC CE signaling, and the number of such TCI status identifiers is one, then the corresponding beam determination scheme is that the beam of the "candidate cell that meets the execution conditions" is the beam corresponding to the TCI status identifier of the second candidate cell.

[0393] Alternatively, if Case 1 is that there is a TCI status identifier corresponding to the third candidate cell in the MAC CE signaling, and the number of such TCI status identifiers is one, then the corresponding beam determination scheme is that the beam of the "candidate cell that meets the execution conditions" is the beam corresponding to the TCI status identifier of the third candidate cell.

[0394] Therefore, in Case 1, when the terminal device has the same or different types of "candidate cells that meet the execution conditions" corresponding to different execution condition information, it can determine the beam of the "candidate cell that meets the execution conditions" and then use the beam of the "candidate cell that meets the execution conditions" to access the target cell. This can effectively solve the problem of inconsistency between "any first beam or the first beam with larger measurement quality" and "the beam of the candidate cell that meets the execution conditions is the second beam" caused by using different beam determination schemes at the same time.

[0395] It should be noted that, in order to improve the success rate of cell handover, for candidate cells with a TCI status identifier of one in the MAC CE signaling, the original cell network equipment also includes the following steps:

[0396] S430: Send the corresponding TCI status identifier from the MAC CE signaling to the candidate cell network device.

[0397] It should be understood that the candidate cell includes a first candidate cell, a second candidate cell, or a third candidate cell. The first candidate cell is a candidate cell that satisfies the first condition LTM execution event and includes the corresponding TCI status identifier in the MAC CE signaling. The second candidate cell is a candidate cell that satisfies the first threshold value and the second threshold value and includes the corresponding TCI status identifier in the MAC CE signaling. The third candidate cell is a candidate cell that satisfies the first condition LTM execution event and satisfies the first threshold value and the second threshold value and includes the corresponding TCI status identifier in the MAC CE signaling.

[0398] Specifically, when the candidate cells include one type of candidate cell, the original cell network device can send the TCI status identifier corresponding to the first candidate cell in the MAC CE signaling to the first candidate cell network device, or the original cell network device can send the TCI status identifier corresponding to the second candidate cell in the MAC CE signaling to the second candidate cell network device, or the original cell network device can send the TCI status identifier corresponding to the third candidate cell in the MAC CE signaling to the third candidate cell network device.

[0399] Therefore, the original cell network equipment sends MAC CE signaling to the terminal equipment, which includes the active transmission configuration index (TCI) status identifier corresponding to the candidate cell. It also sends the TCI status identifier corresponding to the candidate cell network equipment in the MAC CE signaling to all candidate cell network equipment. This allows all candidate cell network equipment that may become the target cell to know in advance which beam corresponding to the TCI status identifier in the cell the terminal equipment may use, thereby improving the cell success rate.

[0400] It should be noted that candidate cells may include one or more types of candidate cells. When candidate cells include multiple types, the original cell network device can send the corresponding TCI status identifier to the network devices of all types of candidate cells, thereby improving the cell handover efficiency in subsequent cell reselection scenarios.

[0401] As another implementation, when the candidate cells can include multiple types of candidate cells, the original cell network device can also send only the TCI status identifier corresponding to the "high-priority candidate cell that meets the execution conditions" to the "high-priority candidate cell that meets the execution conditions" network device, thereby reducing communication resources.

[0402] Regarding scenario 2, the beam determination scheme is explained as follows:

[0403] It should be understood that the interpretation of "target TCI status identifier" in Case 2 is the same as the description of "target TCI status identifier" in Case 1, that is: the target TCI status identifier is the TCI status identifier corresponding to the first candidate cell, or the target TCI status identifier is the TCI status identifier corresponding to the second candidate cell, or the target TCI status identifier is the TCI status identifier corresponding to the third candidate cell.

[0404] It should also be understood that the beam determination scheme corresponding to Case 2 is: the beam of the candidate cell that meets the execution conditions is the beam corresponding to the target TCI status identifier arranged in the preset position included in the MAC CE signaling, or the beam corresponding to any target TCI status identifier included in the MAC CE signaling that successfully accesses the target cell before the duration of the attempt to access the target cell through the selected beam expires.

[0405] The aforementioned preset position can be determined according to a predefined rule. The "predefined rule" can be the first target TCI status identifier among multiple target TCI status identifiers, or it can be the second target TCI status identifier among multiple target TCI status identifiers. Therefore, this application embodiment does not specifically limit the predefined rule. Thus, the aforementioned preset position can be understood as the first digit, the adjacent digits of the first digit, the last digit, the adjacent digits of the last digit, etc. This application embodiment does not specifically limit the specific position of the preset position. The phrase "the beam corresponding to any target TCI status identifier successfully accesses the beam corresponding to the target cell before the duration of attempting to access the target cell through the selected beam times out" differs from "the beam corresponding to any target TCI status identifier" because the latter also includes: "failed to successfully access the beam corresponding to the target cell after the duration of accessing the target cell times out." In other words, when there are multiple target TCI status identifiers in the MAC CE signaling, the corresponding beam determination scheme is as follows: the beam of the candidate cell that meets the execution conditions is the third beam, which is one of the following beams: the beam corresponding to the first target TCI status identifier included in the MAC CE signaling, or the beam corresponding to the second target TCI status identifier included in the MAC CE signaling. The first target TCI status identifier is a target TCI status identifier arranged in a preset position, the second target TCI status identifier is any one target TCI status identifier, and the beam corresponding to the second target TCI status identifier is the beam that successfully accessed the target cell before the timeout period of the attempt to access the target cell using the selected beam expired.

[0406] Specifically, when there is a TCI status identifier corresponding to a candidate cell in the MAC CE signaling, the specific details of Case 2 and the corresponding beam determination scheme include:

[0407] If scenario 2 involves a TCI status identifier corresponding to the first candidate cell in the MAC CE signaling, and there are multiple TCI status identifiers, then the corresponding beam determination scheme is as follows: the beam of the "candidate cell that meets the execution conditions" is the beam corresponding to the "TCI status identifier corresponding to the first candidate cell" arranged in the preset position in the MAC CE signaling, or the beam in the MAC CE signaling that successfully accesses the target cell before the duration of the attempt to access the target cell through the selected beam expires.

[0408] Alternatively, if Case 2 involves a TCI status identifier corresponding to a second candidate cell in the MAC CE signaling, and there are multiple TCI status identifiers, then the corresponding beam determination scheme is as follows: the beam of the "candidate cell that meets the execution conditions" is the beam corresponding to the "TCI status identifier corresponding to the second candidate cell" arranged in a preset position in the MAC CE signaling, or the beam in the MAC CE signaling that successfully accesses the target cell before the duration of the attempt to access the target cell through the selected beam expires.

[0409] Alternatively, if Case 2 involves a TCI status identifier corresponding to a third candidate cell in the MAC CE signaling, and there are multiple TCI status identifiers, then the corresponding beam determination scheme is as follows: the beam of the "candidate cell that meets the execution conditions" is the beam corresponding to the "TCI status identifier corresponding to the third candidate cell" arranged in the preset position in the MAC CE signaling, or the beam in the MAC CE signaling that successfully accesses the target cell before the duration of the attempt to access the target cell through the selected beam expires.

[0410] Therefore, in scenario 2, when the terminal device has the same or different types of "candidate cells that meet the execution conditions" corresponding to different execution condition information, it can determine the beam of the "candidate cell that meets the execution conditions" and then use the beam of the "candidate cell that meets the execution conditions" to access the target cell. This can effectively solve the problem of inconsistency between "any first beam or the first beam with larger measurement quality" and "the beam of the candidate cell that meets the execution conditions is the third beam" caused by using different beam determination schemes at the same time.

[0411] It should be understood that when the third beam is the beam corresponding to the second target TCI status identifier included in the MAC CE signaling, the specific steps of "using the beam of the candidate cell that meets the execution conditions to access the target cell to complete the cell handover" in S420 are explained as follows in this application example:

[0412] S4221. When accessing a target cell using a beam corresponding to a target TCI status identifier, start a first timer and a timeout timer T304. The first timer is the timer corresponding to the duration of the attempt to access the target cell using the selected beam.

[0413] S4222. If the user successfully accesses the target cell before the first timer expires, the cell handover is completed.

[0414] S4223. If access to the target cell is not successful before the first timer expires and T304 has not expired, then access the target cell using the beam corresponding to another target TCI status identifier and restart the first timer until T304 expires or access to the target cell is successful.

[0415] It should be understood that the first timer and the timeout timer T304 can be hardware with the same or different structures, and this application embodiment does not specifically limit this. The first timer can be started when accessing the target cell using a beam corresponding to a target TCI status identifier, or when a "candidate cell that meets the execution conditions" is evaluated. This application embodiment does not specifically limit the start time.

[0416] It should also be understood that another target TCI status identifier can be: the beam corresponding to the target TCI status identifier of any other candidate cell, or the beam corresponding to another target TCI status identifier adjacent to the target TCI status identifier used in the access failure. Therefore, the embodiments of this application do not specifically limit the beam reselection scheme.

[0417] It should also be understood that the timing duration of the attempt to access the target cell controls the access operation corresponding to "accessing the target cell using the beam corresponding to a target TCI status identifier". If the access to the target cell is not successful before the first timer expires and T304 does not expire, it means that the access to the target cell was not successful within the timing duration of the attempt to access the target cell. The beam reselection can be initiated in time, and the reselected beam can be used to re-access the target cell. This avoids the phenomenon of low cell handover efficiency caused by the access operation time corresponding to the same beam being too long, thus improving the cell handover success rate and efficiency.

[0418] It should be noted that, in scenario 2, to improve the success rate of cell handover, for candidate cells with multiple TCI status identifiers in the MAC CE signaling, the method also includes:

[0419] S440. Send the TCI status identifier arranged in a preset position from multiple corresponding TCI status identifiers to the candidate cell network device; or, send multiple corresponding TCI status identifiers and indication information to the candidate cell network device, wherein the indication information is used to indicate that the TCI status identifier arranged in the preset position is determined from multiple corresponding TCI status identifiers.

[0420] Specifically, if the candidate cells corresponding to multiple TCI status identifiers in the MAC CE signaling include one or more of the first candidate cell, the second candidate cell, or the third candidate cell, then the original cell network device sends multiple TCI status identifiers arranged in preset positions to one or more of the first candidate cell network device, the second candidate cell network device, or the third candidate cell network device; or, sends multiple corresponding TCI status identifiers and indication information to the first candidate cell network device.

[0421] The candidate cells include a first candidate cell, a second candidate cell, or a third candidate cell. The first candidate cell is a candidate cell that meets the first condition LTM execution event and whose MAC CE signaling includes the corresponding TCI status identifier. The second candidate cell is a candidate cell that meets the first threshold and the second threshold and whose MAC CE signaling includes the corresponding TCI status identifier. The third candidate cell is a candidate cell that meets the first condition LTM execution event and meets the first threshold and the second threshold and whose MAC CE signaling includes the corresponding TCI status identifier.

[0422] It should be understood that "multiple corresponding TCI status identifiers" refers to the TCI status identifiers corresponding to the same candidate cell. The explanation of "preset bit" has been described above and will not be repeated here.

[0423] It should also be understood that the specific form of the "indication information" can be any form representing "the TCI status identifier arranged in a preset position from multiple corresponding TCI status identifiers", such as numbers, fields, or other forms, and this application does not limit this. In one example, the multiple corresponding beams are beam 1, beam 2, beam 3, and beam 4. If the indication information is "0010", then the indication information indicates that beam 3, corresponding to the TCI status identifier at the third preset position, can be used as the beam adopted by the terminal device when it wants to access the target cell when the candidate cell is the target cell.

[0424] It should also be understood that by using the above two methods of sending information to the candidate cell network device, the candidate cell network device can know in advance the beam of the corresponding candidate cell that the terminal device may use before the terminal device "uses the beam of the candidate cell that meets the execution conditions to access the target cell", which can improve the success rate of cell handover.

[0425] It should be noted that there may be multiple TCI status identifiers for the first candidate cell, the second candidate cell, and the third candidate cell in the MAC CE signaling. These include: each candidate cell has only one TCI status identifier, each candidate cell has multiple TCI status identifiers, some candidate cells have only one TCI status identifier, and some candidate cells have multiple TCI status identifiers.

[0426] Therefore, as another implementation method, when Case 1 includes the situation where each candidate cell corresponds to only one TCI status identifier, the corresponding beam determination scheme further includes:

[0427] If Case 1 is that there are at least two TCI status identifiers corresponding to the first candidate cell, the second candidate cell, and the third candidate cell in the MAC CE signaling, and the number of TCI status identifiers corresponding to each candidate cell is one, then the corresponding beam determination scheme is: configure different priorities for different types of candidate cells, then select the candidate cell with higher priority that meets the execution conditions from the candidate cells that meet the execution conditions, and then select the beam of the candidate cell with higher priority that meets the execution conditions.

[0428] In one example, the priority of the "third candidate cell" is one, the priority of the "second candidate cell" is two, and the priority of the "first candidate cell" is three, where priority one is higher than priority two, and priority two is higher than priority three. With this priority configuration, the candidate cells that meet the execution conditions are determined, and the candidate cell with the highest priority that meets the execution conditions is selected. Then, the beam of the candidate cell with the highest priority that meets the execution conditions is selected. After selecting the "candidate cell with the highest priority that meets the execution conditions," the beam corresponding to the TCI status identifier of the "candidate cell with the highest priority that meets the execution conditions" is determined as the beam of the "candidate cell that meets the execution conditions."

[0429] Therefore, in Case 1, when the terminal device has the same or different types of "candidate cells that meet the execution conditions" corresponding to different execution condition information, it can determine the beam of the "candidate cell that meets the execution conditions" and then use the beam of the "candidate cell that meets the execution conditions" to access the target cell. This can effectively solve the problem of inconsistency between "any first beam or the first beam with larger measurement quality" and "the beam of the candidate cell that meets the execution conditions is the second beam" caused by using different beam determination schemes at the same time.

[0430] Therefore, as another implementation method, when there are multiple TCI status identifiers for each candidate cell in case 2, the corresponding beam determination scheme also includes:

[0431] If Case 2 is that there are at least two TCI status identifiers corresponding to the first candidate cell, the second candidate cell, and the third candidate cell in the MAC CE signaling, and the number of TCI status identifiers corresponding to each candidate cell is multiple, then the corresponding beam determination scheme is: configure different priorities for different types of candidate cells, and then select the candidate cell with higher priority that meets the execution conditions from the candidate cells that meet the execution conditions, and then select the beam of the candidate cell with higher priority that meets the execution conditions.

[0432] In one example, the priority of the "third candidate cell" is one, the priority of the "second candidate cell" is two, and the priority of the "first candidate cell" is three, where priority one is higher than priority two, and priority two is higher than priority three. With this priority configuration, the candidate cells that meet the execution conditions are determined, and the candidate cell with the highest priority that meets the execution conditions is selected. Then, the beam of the candidate cell with the highest priority that meets the execution conditions is selected. After selecting the "candidate cell with the highest priority that meets the execution conditions," the beam corresponding to the TCI status identifier of the "candidate cell with the highest priority that meets the execution conditions" is determined as the beam of the "candidate cell that meets the execution conditions."

[0433] Therefore, in scenario 2, when the terminal device has the same or different types of "candidate cells that meet the execution conditions" corresponding to different execution condition information, it can determine the beam of the "candidate cell that meets the execution conditions" and then use the beam of the "candidate cell that meets the execution conditions" to access the target cell. This can effectively solve the problem of inconsistency between "any first beam or the first beam with larger measurement quality" and "the beam of the candidate cell that meets the execution conditions is the third beam" caused by using different beam determination schemes at the same time.

[0434] In another implementation, when some candidate cells correspond to only one TCI status identifier and some candidate cells correspond to multiple TCI status identifiers, the corresponding beam determination scheme includes:

[0435] From all candidate cells that meet the execution conditions, a target cell is selected. If the target cell has only one TCI status identifier, the beam determination will be performed in the subsequent process according to the beam determination scheme corresponding to Case 1. If the target cell has multiple TCI status identifiers, the beam determination will be performed in the subsequent process according to the beam determination scheme corresponding to Case 2.

[0436] Therefore, in the case that there may be multiple corresponding TCI status identifiers among the first candidate cell, second candidate cell, and third candidate cell in the MAC CE signaling, the beam of the candidate cell that meets the execution conditions can be determined in a timely manner, thereby improving the cell handover efficiency.

[0437] The following describes the cell handover schemes when the original cell network device does not send MAC CE signaling and when the original cell network device sends MAC CE signaling, using the interaction between the terminal device and the network device as examples.

[0438] like Figure 6 As shown, cell handover method 600 includes the following steps:

[0439] S601, The terminal device sends the L1 measurement results to the original cell network device.

[0440] S602, LTM handover based on the original community network equipment's execution conditions.

[0441] It should be understood that the explanation of "conditional LTM handover" is the same as that of "conditional LTM cell handover", and will not be repeated here.

[0442] S603. The original cell network device sends a conditional LTM handover request to the candidate cell network device.

[0443] Candidate cells include target cells and potential target cells.

[0444] S604. The candidate cell network device sends a conditional LTM handover request response to the original cell network device.

[0445] Specifically, S604 enables the original cell network equipment to obtain conditional LTM candidate cell configuration information. It should be understood that this conditional LTM candidate cell configuration information may include measurement information for each candidate cell. Furthermore, this candidate cell is the same concept as "conditional LTM candidate cell".

[0446] S605, the original community network equipment sends RRC reconfiguration information to the terminal equipment.

[0447] The RRC reconfiguration information, also known as the RRC reconfiguration message, is used to instruct the terminal equipment to perform uplink and downlink synchronization procedures for candidate cells. This RRC reconfiguration message includes measurement information and handover configuration information for each candidate cell. The handover configuration information includes execution condition information and LTM configuration information for each candidate cell.

[0448] S606, The terminal device sends an RRC reconfiguration complete message to the original cell network device.

[0449] S607. The terminal device performs a downlink synchronization process for the LTM candidate cells that meet the conditions.

[0450] S608, The terminal device performs an uplink synchronization process for the LTM candidate cells based on the conditions.

[0451] S609. Evaluate whether the candidate cell meets the corresponding execution conditions, and disconnect the connection with the original cell network device when a candidate cell that meets the execution conditions is found.

[0452] S610. Determine the beam of the candidate cell that meets the execution conditions.

[0453] S611. The terminal device executes a random access procedure to complete the conditional LTM handover.

[0454] In other words, the terminal device uses the beam of a candidate cell that meets the execution conditions to access the target cell in order to complete the cell handover.

[0455] It should be noted that the specific cell handover scheme implemented in this application embodiment is similar to the specific cell handover scheme implemented when the terminal device does not receive the handover configuration information under the conditional LTM, and will not be described again here.

[0456] It should be understood that inter-cell beam management (ICBM) requires the terminal equipment to be within the coverage of the original cell. The original cell's Transmission Reception Point (TRP) can send information to the terminal equipment via non-dedicated channels / signals (e.g., broadcast, paging). The candidate cell's TRP can transmit dedicated information. Simultaneous data reception and transmission are not supported. The terminal equipment's MAC entity receives MAC CE signaling from the original cell. In this case, the cell handover method can be executed. Figure 7 As shown, cell handover method 700 includes the following steps:

[0457] S701, The terminal device sends the L1 measurement results to the original cell network device.

[0458] S702, LTM handover based on the original community network equipment's execution conditions.

[0459] It should be understood that the explanation of "conditional LTM handover" is the same as that of "conditional LTM cell handover", and will not be repeated here.

[0460] S703: The original cell network device sends a conditional LTM handover request to the candidate cell network device.

[0461] Candidate cells include target cells and potential target cells.

[0462] S704. The candidate cell network device sends a conditional LTM handover request response to the original cell network device.

[0463] Specifically, S704 enables the original cell network equipment to obtain conditional LTM candidate cell configuration information. This conditional LTM candidate cell configuration information may include measurement information for each candidate cell.

[0464] S705, the original community network equipment sends RRC reconfiguration information to the terminal equipment.

[0465] The RRC reconfiguration information, also known as the RRC reconfiguration message, is used to instruct the terminal equipment to perform uplink and downlink synchronization procedures for candidate cells. This RRC reconfiguration message includes measurement information and handover configuration information for each candidate cell. The handover configuration information includes execution condition information and LTM configuration information for each candidate cell.

[0466] S706, The terminal device sends an RRC reconfiguration complete message to the original cell network device.

[0467] S707. The original cell network equipment sends a MAC CE signaling message to the terminal equipment. The MAC CE signaling message includes the activated TCI state identifier corresponding to the candidate cell.

[0468] It should be understood that the "activated TCI state identifier" is the same as the "activated transport configuration index TCI state identifier" mentioned above.

[0469] S708: The original cell network device sends the corresponding TCI state activation information to the candidate cell network device.

[0470] Specifically, for candidate cells where the corresponding TCI state identifier in the MAC CE signaling is one, the "corresponding TCI state activation information" sent by the original cell network device is the corresponding TCI state identifier in the MAC CE signaling.

[0471] It should be understood that for candidate cells with multiple corresponding TCI status identifiers in the MAC CE signaling, the "corresponding TCI state activation information" sent by the original cell network device is the TCI status identifier arranged in a preset position among the multiple corresponding TCI status identifiers; or it is multiple corresponding TCI status identifiers and indication information, which is used to indicate the TCI status identifier arranged in the preset position from the multiple corresponding TCI status identifiers.

[0472] It should also be understood that when the terminal device performs LTM under certain conditions, through the operation in S707 described above, and the synchronization of predefined rules between the terminal device and the original cell network device, the terminal device can obtain the activated TCI state identifier corresponding to the candidate cell that meets the execution conditions, while ensuring that the terminal device and the original cell network device have a consistent understanding of the activated TCI. Through the operation in S708 described above, the embodiments of this application can enable the candidate cell network device to know the corresponding activated TCI state identifier, thereby improving the cell handover success rate.

[0473] S709. The terminal device performs a downlink synchronization process for LTM candidate cells based on the conditions.

[0474] S710, the terminal device performs an uplink synchronization process for LTM candidate cells based on the conditions.

[0475] S711. Evaluate whether the candidate cell meets the corresponding execution conditions, and disconnect the connection with the original cell network device when a candidate cell that meets the execution conditions is found.

[0476] S712. Determine the beam of the candidate cell that meets the execution conditions.

[0477] S713, The terminal device executes a random access procedure to complete the conditional LTM handover.

[0478] In other words, the terminal device uses the beam of a candidate cell that meets the execution conditions to access the target cell in order to complete the cell handover.

[0479] In S701 to S713 above, the original cell network equipment pre-configures the measurement information of each candidate cell, as well as the execution condition information and LTM configuration information of each candidate cell, for the terminal equipment. When the terminal equipment receives the measurement information of each candidate cell, as well as the execution condition information and LTM configuration information of each candidate cell, it begins the evaluation process. When the terminal equipment evaluates a candidate cell that meets the corresponding execution conditions and simultaneously receives MAC CE signaling including the TCIstate identifier issued by the original cell network equipment, the terminal equipment can determine how to use the activated TCI to determine the beam and how to execute the random access procedure according to S708 to S713 in the above cell handover procedure.

[0480] For example, when it is determined that a candidate cell has K superior beams whose corresponding measurement quality is greater than or equal to the first threshold value, and at the same time a MAC CE signaling including the TCI state identifier of the candidate cell is received from the original cell network equipment, the subsequent operation is determined based on the number of TCI state identifiers of the candidate cell.

[0481] Specifically, when the number of TCI state identifiers in the candidate cell is one, the terminal device uses the beam corresponding to the TCI state identifier as the beam of the candidate cell that meets the execution conditions and accesses the target cell to complete the cell handover. To improve the success rate of cell handover, when the original cell network device sends MAC CE signaling to the terminal device, it also sends TCI state activation information to the corresponding candidate cell to inform the corresponding candidate cell of the TCI state identifier that the terminal device may use.

[0482] When there are multiple TCI state identifiers in a candidate cell, the terminal device can use predefined rules synchronized with the original cell network equipment to select the corresponding preset bit of the TCI state identifier in the MAC CE signaling as the beam of a candidate cell that meets the execution conditions to access the target cell, thereby completing the cell handover. To improve the success rate of cell handover, when the original cell network equipment sends MAC CE signaling to the terminal device, it also sends TCI state activation information to the corresponding candidate cell, informing the corresponding candidate cell of the TCI state identifier that the terminal device may use.

[0483] For example, Figure 5 TCI state ID 1 and TCI state ID 2 belong to the same candidate cell. The default bit in the predefined rules is the first bit. To avoid discrepancies between the TCI state ID known to the candidate cell network device and the TCI state ID corresponding to the beam used by the terminal device during handover, the original cell network device informs the candidate cell network device of TCI state ID 1. Based on the predefined rules, when the terminal device uses this candidate cell as the target cell, it also knows to use the beam corresponding to TCI state ID 1 to access the target cell.

[0484] When there are multiple TCI state identifiers for the candidate cell, in addition to implementing cell handover through predefined rules, cell handover can also be achieved through the following scheme: the original cell network device informs the corresponding candidate cell network device of the TCI state activation information; when the terminal device performs handover, it first uses a beam associated with a TCI state ID to access the target cell; a "Txxx" shorter than T304 is introduced, and "Txxx" is started during access handover. If the "Txxx" times out and fails to successfully access the target cell, and T304 does not time out, then the terminal device can reselect another beam associated with a TCI state ID to access the target cell.

[0485] It should be noted that the specific cell handover scheme implemented in this application embodiment is similar to the specific cell handover scheme implemented when the terminal device receives MACCE signaling, and will not be described again here.

[0486] The above, combined with Figure 4 , Figure 6 and Figure 7 The methods provided in the embodiments of this application are described in detail below. Figure 8 The apparatus provided in the embodiments of this application will be described in detail.

[0487] Figure 8 This is a schematic block diagram of the cell handover device 8000 provided in an embodiment of this application. Figure 8 As shown, the cell handover device 8000 may include a processing unit 8010 and a transceiver 8020.

[0488] In one possible design, the cell handover device 8000 can implement the operations corresponding to the terminal device in the above method embodiments. For example, the cell handover device can be the terminal device, or a component configured in the terminal device, such as a chip or circuit.

[0489] The cell handover device 8000 can achieve this. Figure 4 , Figure 6 and Figure 7 The corresponding operations of the terminal device in the illustrated method embodiment. For example, the transceiver unit 8020 can be used to execute S410 in method 400, and the processing unit 8010 can be used to execute S420 in method 400. Furthermore, each unit in the cell handover device 8000 and the aforementioned other operations and / or functions are respectively for implementing... Figure 4 The corresponding process in the method embodiment shown.

[0490] Specifically, when the cell handover device 8000 is used to perform... Figure 4 In method 400, the transceiver unit 8020 can be used to receive conditional LTM handover configuration information sent by the network device. This handover configuration information is used to configure candidate cells to perform conditional LTM cell handover when the execution conditions are met. The processing unit 8010 can be used to access the target cell using the beam of the candidate cell that meets the execution conditions when a candidate cell that meets the execution conditions is evaluated, so as to complete the cell handover. Here, there are one or more candidate cells.

[0491] In another possible design, the cell handover device 8000 can perform the operations corresponding to the network device in the above method embodiments. For example, the cell handover device can be a network device, or a component configured in the network device, such as a chip or circuit.

[0492] The cell handover device 8000 can achieve this. Figure 4 The corresponding operations of the network device in the illustrated method embodiment. For example, the transceiver unit 8020 can be used to execute S410 in method 400. Furthermore, each unit in the cell handover device 8000 and the other operations and / or functions described above are respectively for implementing... Figure 4 The corresponding process in the method embodiment shown.

[0493] Specifically, when the cell handover device 8000 is used to perform... Figure 4 In method 400, the transceiver unit 8020 can be used to send conditional LTM handover configuration information to the terminal device. This handover configuration information is used to configure the candidate cell to perform conditional LTM cell handover when the execution conditions are met; the candidate cell can be one or more.

[0494] It should be understood that the specific process of each unit performing the above-mentioned corresponding steps has been described in detail in the above method embodiments, and will not be repeated here for the sake of brevity.

[0495] It should also be understood that the module division in the embodiments of this application is illustrative and only represents a logical functional division. In actual implementation, there may be other division methods. Furthermore, the functional modules in the various embodiments of this application can be integrated into a processor, exist as separate physical entities, or have two or more modules integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0496] It should be understood that the cell handover device 8000 can correspond to Figure 1 The communication system 100 shown includes either terminal device 110 or original cell network device 120. Terminal device 110 can be an example of a terminal device, and original cell network device 120 can be an example of a network device. The processing unit 8010 in the cell handover device 8000 can correspond to the processor in terminal device 110 or original cell network device 120. It can call instructions stored in memory through the processor in terminal device 110 or original cell network device 120 to implement the above functions, such as network encoding and acquiring raw packets. The transceiver unit 8020 can correspond to the interface in terminal device 110 or original cell network device 120. It can respond to the processor's instructions to implement the above functions of receiving and / or sending data.

[0497] Specifically, the transceiver unit 8020 in the cell handover device 8000 can be implemented through a transceiver or a communication interface, for example, it can correspond to... Figure 9 The transceiver 9020 in the terminal device 9000 shown in the figure and Figure 10The network device shown includes the RRU 1020. The processing unit 8010 in the cell handover device 8000 can be implemented by at least one processor, for example, corresponding to... Figure 9 The processor 9010 in the terminal device 9000 shown in the figure and Figure 10 The processor 1060 in the network device shown in the figure.

[0498] It should be understood that the specific process of each unit performing the above-mentioned corresponding steps has been described in detail in the above method embodiments, and will not be repeated here for the sake of brevity.

[0499] Figure 9 This is a schematic diagram of a possible structure of the terminal device 9000 provided in an embodiment of this application. The terminal device 9000 can be applied to, for example... Figure 1 In the system shown, the functions of the terminal device in the above method embodiments are executed. For example... Figure 9 As shown, the terminal device 9000 includes a processor 9010 and a transceiver 9020. Optionally, the terminal device 9000 also includes a memory 9030. The processor 9010, transceiver 9020, and memory 9030 can communicate with each other via internal connections to transmit control and / or data signals. The memory 9030 stores computer programs, and the processor 9010 retrieves and runs the computer programs from the memory 9030 to control the transceiver 9020 to transmit and receive signals. Optionally, the terminal device 9000 may also include an antenna 9040 for transmitting uplink data or uplink control signaling output by the transceiver 9020 via wireless signals.

[0500] The aforementioned processor 9010 and memory 9030 can be combined into a cell handover device. The processor 9010 executes the program code stored in the memory 9030 to implement the above functions. In specific implementations, the memory 9030 can be integrated into the processor 9010 or independent of it. The processor 9010 can be combined with... Figure 8 This corresponds to processing unit 8010 in the text.

[0501] The aforementioned transceiver 9020 can be used with Figure 8 The transceiver unit 8020 corresponds to this. The transceiver 9020 may include a receiver (or receiver circuit) and a transmitter (or transmitter circuit). The receiver is used to receive signals, and the transmitter is used to transmit signals.

[0502] It should be understood that Figure 9 The terminal device 9000 shown can achieve Figure 4 , Figure 6 and Figure 7The methods illustrated in the embodiments involve various processes of the terminal device. The operations and / or functions of each module in the terminal device 9000 are respectively for implementing the corresponding processes in the above method embodiments. For details, please refer to the descriptions in the above method embodiments; to avoid repetition, detailed descriptions are appropriately omitted here.

[0503] The processor 9010 described above can be used to execute the actions implemented internally by the terminal device as described in the preceding method embodiments, while the transceiver 9020 can be used to execute the actions described in the preceding method embodiments of sending data to or receiving data from the network device by the terminal device. Please refer to the descriptions in the preceding method embodiments for details, which will not be repeated here.

[0504] Optionally, the terminal device 9000 may also include a power supply 9050 for providing power to various devices or circuits in the terminal device.

[0505] In addition, to further enhance the functionality of the terminal device, the terminal device 9000 may also include one or more of the following: an input unit 9060, a display unit 9070, an audio circuit 9080, a camera 9090, and a sensor 9100. The audio circuit 9080 may also include a speaker 9110, a microphone 9120, etc.

[0506] Figure 10 This is a schematic diagram of a possible structure of a network device provided in an embodiment of this application, for example, a schematic diagram of the structure of a base station 1000. The base station 1000 can be applied to, for example... Figure 10 In the system shown, the functions of the network device in the above method embodiments are performed. For example... Figure 10 As shown, the base station 1000 may include one or more radio frequency units, such as a remote radio unit (RRU) 1020 and one or more baseband units (BBUs) (also known as distributed units (DUs)) 1010. The RRU 1020 can be referred to as a transceiver unit, and... Figure 8The transceiver unit 8020 corresponds to this. Optionally, this transceiver unit can also be called a transceiver, transceiver circuit, or transceiver, etc., and it can include at least one antenna 1030 and a radio frequency unit 1040. Optionally, the transceiver unit can include a receiving unit and a transmitting unit. The receiving unit can correspond to a receiver (or receiver circuit), and the transmitting unit can correspond to a transmitter (or transmitter circuit). The RRU 1020 part is mainly used for the transmission and reception of radio frequency signals and the conversion between radio frequency signals and baseband signals. For example, it is used to send handover configuration information to the terminal equipment to configure the candidate cell to perform LTM cell handover when the execution conditions are met. The BBU 1010 part is mainly used for baseband processing and base station control. The RRU 1020 and BBU 1010 can be physically set together or physically separated, i.e., a distributed base station.

[0507] The BBU 1010 is the control center of the base station, also known as the processing unit, and can communicate with... Figure 8 The corresponding processing unit 8010 is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, spreading, etc. For example, the BBU (processing unit) can be used to control the base station to execute the operation process of the network device in the above method embodiment, such as generating the above-mentioned indication information.

[0508] In one example, the BBU 1010 can consist of one or more boards. These boards can collectively support a single access standard wireless access network (such as LTE), or they can each support different access standards wireless access networks (such as LTE, 5G, or other networks). The BBU 1010 also includes a memory 9050 and a processor 9060. The memory 9050 stores necessary instructions and data. The processor 9060 controls the base station to perform necessary actions, such as controlling the base station to execute the network device operation procedures described in the above method embodiments. The memory 9050 and processor 9060 can serve one or more boards. That is, each board can have its own memory and processor, or multiple boards can share the same memory and processor. Furthermore, each board can also have necessary circuitry.

[0509] It should be understood that Figure 10 The base station 1000 shown can achieve Figure 4 The methods illustrated in the embodiments involve various processes of the network device. The operations and / or functions of each module in the base station 1000 are respectively for implementing the corresponding processes in the above method embodiments. For details, please refer to the descriptions in the above method embodiments; to avoid repetition, detailed descriptions are appropriately omitted here.

[0510] The BBU 1010 described above can be used to perform the actions implemented internally by the network device as described in the preceding method embodiments, while the RRU 1020 can be used to perform the actions described in the preceding method embodiments whereby the network device sends data to or receives data from the terminal device. Please refer to the descriptions in the preceding method embodiments for details, which will not be repeated here.

[0511] It should be understood that Figure 10 The base station 1000 shown is merely one possible architecture for network devices and should not be construed as limiting this application. The method provided in this application can be applied to network devices with other architectures, such as network devices including CUs, DUs, and active antenna units (AAUs). This application does not limit the specific architecture of the network device.

[0512] This application also provides a cell handover device, including a processor and an interface; the processor is used to execute the method in any of the above method embodiments.

[0513] It should be understood that the aforementioned cell handover device can be one or more chips. For example, the cell handover device can be a field programmable gate array (FPGA), an application-specific integrated circuit (ASIC), a system on chip (SoC), a central processor unit (CPU), a network processor (NP), a digital signal processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD), or other integrated chips.

[0514] In implementation, each step of the above method can be completed by integrated logic circuits in the processor's hardware or by instructions in software. The steps of the method disclosed in the embodiments of this application can be directly implemented by a hardware processor, or by a combination of hardware and software modules in the processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method. To avoid repetition, detailed descriptions are omitted here.

[0515] It should be noted that the processor in the embodiments of this application can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method embodiments can be completed by the integrated logic circuitry in the processor's hardware or by instructions in software form. The processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory, and the processor reads the information in the memory and, in conjunction with its hardware, completes the steps of the above methods.

[0516] It is understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory used in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0517] According to the method provided in the embodiments of this application, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, causes the computer to perform... Figure 4 , Figure 6 and Figure 7 The method of any of the embodiments shown.

[0518] According to the method provided in the embodiments of this application, this application also provides a chip system, including at least one processor and a communication interface, wherein the communication interface and at least one processor are interconnected via a line, and the at least one processor is used to run computer programs or instructions, causing the computer to perform... Figure 4 , Figure 6 and Figure 7 The method of any of the embodiments shown.

[0519] According to the method provided in the embodiments of this application, this application also provides a computer program product, including a computer program, which, when run, causes the computer to perform... Figure 4 , Figure 6 and Figure 7 The method of any of the embodiments shown.

[0520] In the above-described device embodiments, the network devices and terminal devices in the method embodiments completely correspond to each other, with corresponding modules or units executing the corresponding steps. For example, the communication unit (transceiver) executes the receiving or sending steps in the method embodiments, while other steps besides sending and receiving can be executed by the processing unit (processor). The functions of specific units can be found in the corresponding method embodiments. There can be one or more processors.

[0521] As used in this specification, the terms "component," "module," "system," etc., are used to refer to computer-related entities, hardware, firmware, combinations of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, and / or a computer. As illustrated, applications running on computing devices and computing devices can both be components. One or more components may reside in a process and / or an execution thread, and components may be located on a single computer and / or distributed among two or more computers. Furthermore, these components can be executed from various computer-readable media on which various data structures are stored. Components can communicate, for example, via local and / or remote processes based on signals having one or more data packets (e.g., data from two components interacting with another component between a local system, a distributed system, and / or a network, such as the Internet interacting with other systems via signals).

[0522] Those skilled in the art will recognize that the various illustrative logical blocks and steps described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this application.

[0523] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0524] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0525] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0526] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0527] In the above embodiments, the functions of each functional unit can be implemented entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. A computer program product includes one or more computer instructions (programs). When the computer program instructions (programs) are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. Computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., high-density digital video discs (DVDs)), or semiconductor media (e.g., solid-state disks (SSDs)).

[0528] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory, random access memory, magnetic disks, or optical disks.

[0529] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cell handover method, characterized in that, Applied to terminal devices, including: The handover configuration information under the LTM mobility mechanism triggered by the first / second layer of the receiving conditions is used to configure the candidate cells to perform LTM cell handover when the execution conditions are met; the candidate cells can be one or more. If a candidate cell that meets the execution conditions is evaluated, the beam of the candidate cell that meets the execution conditions is used to access the target cell to complete the cell handover; If the beam of the candidate cell that meets the execution conditions is any first beam or a first beam with higher measurement quality; if the first beam is the beam of the candidate cell that meets the first condition LTM execution event, or the beam of the candidate cell that meets both the first threshold and the second threshold, or the beam of the candidate cell that meets both the first condition LTM execution event and the first threshold and the second threshold, and if there are multiple first beams, then the beam of the candidate cell that meets the execution conditions is used to access the target cell to complete the cell handover, including: When accessing the target cell using any first beam or a first beam with higher measurement quality, the first timer and timeout timer T304 are started. The first timer is the timer corresponding to the duration of the attempt to access the target cell through the selected beam. If the user successfully accesses the target cell before the first timer expires, the cell handover is completed. If access to the target cell is not successful before the first timer expires and T304 has not expired, another first beam will be used to access the target cell and the first timer will be restarted until T304 expires or access to the target cell is successful.

2. The method according to claim 1, characterized in that, The handover configuration information includes the execution condition information and LTM configuration information of each candidate cell; The execution condition information includes at least one of the following: First condition LTM execution event; The second conditional LTM execution condition information includes a first threshold value and a second threshold value. The first threshold value is used to indicate the threshold value of the beam corresponding measurement quality when the candidate cell meets the execution conditions, and the second threshold value is used to indicate the threshold value of the beam corresponding measurement quality when the original cell meets the execution conditions. The LTM configuration information for the conditions includes: the duration for which the target cell is attempted to be accessed via the selected beam.

3. The method according to claim 2, characterized in that, The first conditional LTM execution event includes any one of the following: The mean of the measurement quality corresponding to the N better beams of the candidate cell is greater than or equal to the measurement quality corresponding to any beam of the original cell, where N is an integer greater than 1. The measurement quality of any beam in the candidate cell is greater than or equal to the measurement quality of any beam in the original cell. The candidate cell has at least one beam whose measurement quality is greater than or equal to the measurement quality of any beam in the original cell; The candidate cell has at least one beam whose measurement quality is greater than or equal to that of at least one beam in the original cell; The mean of the measurement quality corresponding to the N better beams of the candidate cell is greater than or equal to the measurement quality corresponding to the N better beams of the original cell, where N is an integer greater than 1.

4. The method according to claim 2 or 3, characterized in that, The first threshold value includes any one of the following: The first threshold value is the threshold value at which the measurement quality of K better beams corresponding to candidate cells is greater than or equal to that of all K beams, where K is an integer greater than or equal to 1. The first threshold is the threshold value at which the measurement quality of any beam in the candidate cell is greater than or equal to the threshold value. The first threshold is a threshold value in which the mean of the measurement quality corresponding to M better beams in the candidate cell is greater than or equal to the threshold value, where M is an integer greater than 1.

5. The method according to claim 2 or 3, characterized in that, The second threshold value includes any one of the following: The second threshold is the threshold value at which the measurement quality of L better beams in the original cell is less than or equal to that of all beams, where L is an integer greater than or equal to 1. The second threshold is the threshold value at which the measurement quality of any beam in the original cell is less than or equal to the threshold value. The second threshold is the threshold value at which the mean of the measurement quality corresponding to P better beams in the original cell is less than or equal to the threshold value, where P is an integer greater than 1.

6. The method according to claim 2 or 3, characterized in that, The duration of the attempt to access the target cell via the selected beam is less than the corresponding timing duration of the timeout timer T304.

7. The method according to claim 2 or 3, characterized in that, The candidate cells that meet the execution conditions include: Candidate cells that meet the first condition for an LTM execution event; or, Candidate cells that meet both the first and second thresholds; or, The LTM execution event satisfies the first condition, and the candidate cells satisfy both the first and second thresholds.

8. The method according to any one of claims 1-3, characterized in that, The method further includes: Receive MAC CE signaling, which includes the activated transmission configuration index (TCI) status identifier corresponding to the candidate cell; when receiving MAC CE signaling, a candidate cell that meets the execution conditions has been evaluated.

9. The method according to claim 8, characterized in that, The candidate cells that meet the execution conditions include: The first candidate cell; wherein, the first candidate cell is a candidate cell that satisfies the first condition LTM execution event and whose MAC CE signaling includes the corresponding TCI status identifier; or, The second candidate cell is a candidate cell that meets the first threshold and the second threshold and includes the corresponding TCI status identifier in the MACCE signaling. or, The third candidate cell is a candidate cell that satisfies the first condition LTM execution event and satisfies the first threshold and the second threshold, and includes the corresponding TCI status identifier in the MAC CE signaling.

10. The method according to claim 9, characterized in that, The target TCI status identifier in the MAC CE signaling is one; the target TCI status identifier is the TCI status identifier corresponding to the first candidate cell, or the target TCI status identifier is the TCI status identifier corresponding to the second candidate cell, or the target TCI status identifier is the TCI status identifier corresponding to the third candidate cell. The beam of the candidate cell that meets the execution conditions is the second beam, which is the beam corresponding to the target TCI status identifier included in the MAC CE signaling.

11. The method according to claim 9, characterized in that, The target TCI status identifier in the MAC CE signaling can be multiple; the target TCI status identifier is the TCI status identifier corresponding to the first candidate cell, or the target TCI status identifier is the TCI status identifier corresponding to the second candidate cell; or the target TCI status identifier is the TCI status identifier corresponding to the third candidate cell. The beam of the candidate cell that meets the execution conditions is the third beam, and the third beam is one of the following beams: The beam corresponding to the first target TCI status identifier included in the MAC CE signaling, wherein the first target TCI status identifier is the target TCI status identifier arranged in a preset position; or, The beam corresponding to the second target TCI status identifier included in the MAC CE signaling is the beam that successfully accessed the target cell before the duration of the attempt to access the target cell through the selected beam expired.

12. The method according to claim 11, characterized in that, If the beam of the candidate cell that meets the execution conditions is the third beam, and if the third beam corresponds to the second target TCI status identifier included in the MAC CE signaling, then the beam of the candidate cell that meets the execution conditions is used to access the target cell to complete the cell handover, including: When accessing the target cell using a beam corresponding to a target TCI status identifier, a first timer and a timeout timer T304 are started. The first timer is the timer corresponding to the duration of the attempt to access the target cell through the selected beam. If the user successfully accesses the target cell before the first timer expires, the cell handover is completed. If access to the target cell is not successful before the first timer expires and T304 has not expired, the beam corresponding to another target TCI status identifier will be used to access the target cell and the first timer will be restarted until T304 expires or access to the target cell is successful.

13. The method according to any one of claims 1-3 and 9-12, characterized in that, The handover configuration information is carried in Radio Resource Control (RRC) reconfiguration information or in proprietary signaling.

14. A cell handover method, characterized in that, include: The terminal device is sent with conditional Layer 1 / 2 triggered LTM mobility handover configuration information, which is used to configure candidate cells to perform conditional LTM cell handover when the execution conditions are met; the candidate cells can be one or more. The terminal device is used to access the target cell using the beam of a candidate cell that meets the execution conditions if a candidate cell that meets the execution conditions is evaluated, in order to complete the cell handover; wherein, the beam of the candidate cell that meets the execution conditions is: any first beam or a first beam with higher measurement quality; the first beam is the beam of a candidate cell that meets the first condition LTM execution event, or the beam of a candidate cell that meets both the first threshold and the second threshold, or the beam of a candidate cell that meets both the first condition LTM execution event and the first threshold and the second threshold; if there are multiple first beams, then the terminal device... The process involves using a candidate cell whose beam meets the execution conditions to access the target cell and complete the cell handover. This includes: starting a first timer and a timeout timer T304 when accessing the target cell using any first beam or a first beam with higher measurement quality. The first timer is a timer corresponding to the duration of the attempt to access the target cell using the selected beam. If the access to the target cell is successful before the first timer expires, the cell handover is completed. If the access to the target cell is not successful before the first timer expires and T304 has not expired, another first beam is used to access the target cell and the first timer is restarted until T304 expires or the access to the target cell is successful.

15. The method according to claim 14, characterized in that, The handover configuration information includes the execution condition information and LTM configuration information of each candidate cell; The execution condition information includes at least one of the following: First condition LTM execution event; The second conditional LTM execution condition information includes a first threshold value and a second threshold value. The first threshold value is used to indicate the threshold value of the beam corresponding measurement quality when the candidate cell meets the execution conditions, and the second threshold value is used to indicate the threshold value of the beam corresponding measurement quality when the original cell meets the execution conditions. The LTM configuration information for the conditions includes: the duration for which the target cell is attempted to be accessed via the selected beam.

16. The method according to claim 15, characterized in that, The first conditional LTM execution event includes any one of the following: The mean of the measurement quality corresponding to the N better beams of the candidate cell is greater than or equal to the measurement quality corresponding to any beam of the original cell, where N is an integer greater than 1. The measurement quality of any beam in the candidate cell is greater than or equal to the measurement quality of any beam in the original cell. The candidate cell has at least one beam whose measurement quality is greater than or equal to the measurement quality of any beam in the original cell; The candidate cell has at least one beam whose measurement quality is greater than or equal to that of at least one beam in the original cell; The mean of the measurement quality corresponding to the N better beams of the candidate cell is greater than or equal to the measurement quality corresponding to the N better beams of the original cell, where N is an integer greater than 1.

17. The method according to claim 15 or 16, characterized in that, The first threshold value includes any one of the following: The first threshold value is the threshold value at which the measurement quality of K better beams corresponding to candidate cells is greater than or equal to that of all K beams, where K is an integer greater than or equal to 1. The first threshold is the threshold value at which the measurement quality of any beam in the candidate cell is greater than or equal to the threshold value. The first threshold is a threshold value in which the mean of the measurement quality corresponding to M better beams in the candidate cell is greater than or equal to the threshold value, where M is an integer greater than 1.

18. The method according to claim 15 or 16, characterized in that, The second threshold value includes any one of the following: The second threshold is the threshold value at which the measurement quality of L better beams in the original cell is less than or equal to that of all beams, where L is an integer greater than or equal to 1. The second threshold is the threshold value at which the measurement quality of any beam in the original cell is less than or equal to the threshold value. The second threshold is the threshold value at which the mean of the measurement quality corresponding to P better beams in the original cell is less than or equal to the threshold value, where P is an integer greater than 1.

19. The method according to claim 15 or 16, characterized in that, The duration of the attempt to access the target cell via the selected beam is less than the corresponding timing duration of the timeout timer T304.

20. The method according to any one of claims 14-16, characterized in that, The method further includes: Send MAC CE signaling, which includes the activated transmission configuration index (TCI) status identifier corresponding to the candidate cell; when sending MAC CE signaling, the terminal device has evaluated a candidate cell that meets the execution conditions.

21. The method according to claim 20, characterized in that, For candidate cells whose corresponding TCI status identifier in the MAC CE signaling is one, the method further includes: The corresponding TCI status identifier in the MAC CE signaling is sent to the candidate cell network device. The candidate cell includes a first candidate cell, a second candidate cell, or a third candidate cell. The first candidate cell is a candidate cell that satisfies the first condition LTM execution event and the corresponding TCI status identifier is included in the MAC CE signaling. The second candidate cell is a candidate cell that satisfies the first threshold value and the second threshold value and the corresponding TCI status identifier is included in the MAC CE signaling. The third candidate cell is a candidate cell that satisfies the first condition LTM execution event and the first threshold value and the second threshold value and the corresponding TCI status identifier is included in the MAC CE signaling.

22. The method according to claim 20, characterized in that, For candidate cells where the corresponding TCI status identifier in the MAC CE signaling is multiple, the method further includes: Send the TCI status identifiers arranged in preset positions from the multiple corresponding TCI status identifiers to the candidate cell network device; Alternatively, multiple corresponding TCI status identifiers and indication information are sent to the candidate cell network device, wherein the indication information is used to indicate the TCI status identifier arranged in a preset position from multiple corresponding TCI status identifiers. The candidate cells include a first candidate cell, a second candidate cell, or a third candidate cell. The first candidate cell is a candidate cell that satisfies the first condition LTM execution event and whose MAC CE signaling includes the corresponding TCI status identifier. The second candidate cell is a candidate cell that satisfies the first threshold and the second threshold and whose MAC CE signaling includes the corresponding TCI status identifier. The third candidate cell is a candidate cell that satisfies the first condition LTM execution event, satisfies the first threshold and the second threshold, and whose MAC CE signaling includes the corresponding TCI status identifier.

23. The method according to any one of claims 14-16 and 21-22, characterized in that, The handover configuration information is carried in Radio Resource Control (RRC) reconfiguration information or in proprietary signaling.

24. A terminal device, characterized in that, include: Processor, memory, and transceiver; The memory stores computer-executed instructions; the transceiver is used for sending and receiving data. The processor executes computer execution instructions stored in the memory, causing the terminal device to perform the method as described in any one of claims 1-13.

25. A network device, characterized in that, include: Processor, memory, and transceiver; The memory stores computer-executed instructions; the transceiver is used for sending and receiving data. The processor executes computer execution instructions stored in the memory, causing the network device to perform the method as described in any one of claims 14-23.

26. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1-23.

27. A chip system, characterized in that, It includes at least one processor and a communication interface, the communication interface and the at least one processor being interconnected via a line, the at least one processor being configured to run a computer program or instructions to perform the method as described in any one of claims 1-23.

28. A computer program product, characterized in that, Includes a computer program that, when run, causes a computer to perform the method as described in any one of claims 1-23.

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