Cell handover method, and device, storage medium and product

Abstract

The embodiments of the present application relate to the technical field of communications. Provided are a cell handover method, and a device, a storage medium and a product. The method comprises: an original cell network device sending handover configuration information to a terminal device, wherein the handover configuration information is used for configuring a candidate cell to perform a conditional LTM cell handover when an execution condition is met; and when obtaining, by means of evaluation, a candidate cell meeting the execution condition, the terminal device accessing a target cell by using a beam of the candidate cell meeting the execution condition, so as to complete a cell handover. In this way, the handover robustness can be improved.

Description

Cell switching method, device, storage medium and product

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on February 8, 2024, with application number 202410177019.7 and application name “Cell Switching Method, Device, Storage Medium and Product”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to a cell switching method, device, storage medium and product. Background Art

[0003] Mobility has always been a major topic for the 3rd Generation Partnership Project (3GPP). Therefore, each release (R) of the standard specifications developed by 3GPP proposes some enhanced technologies. For example, in version R18, to address issues such as data rate fluctuations, signaling overhead, and latency caused by frequent terminal switching, Layer 1 / 2 Triggered Mobility (LTM) was introduced for the New Radio (NR) of the 5th Generation Mobile Communication Technology (5G). However, this LTM is triggered by network equipment and the switching is performed immediately, resulting in poor switching robustness. Therefore, a switching method with better switching robustness is urgently needed. Summary of the Invention

[0004] The embodiments of the present application provide a cell switching method, device, storage medium and product, which are applied to the field of communication technology, in order to perform conditional LTM cell switching when a candidate cell meets the corresponding execution conditions, thereby improving switching robustness.

[0005] In a first aspect, embodiments of the present application provide a cell handover method. The method may be executed by a terminal device, or may be executed by a component (such as a chip or circuit) configured in the terminal device. The embodiments of the present application are not limited thereto.

[0006] For example, the method includes: receiving the conditional 1 / 2 layer triggered mobility LTM switching configuration information sent by the original cell network device, the switching configuration information is used to configure the candidate cell to perform conditional LTM cell switching 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 switching.

[0007] It should be understood that the original cell network equipment configures the candidate cell through switching configuration information to perform conditional LTM cell switching when the execution conditions are met, so that when the terminal device evaluates the candidate cell that meets the execution conditions, it can use the beam of the candidate cell that meets the execution conditions to access the target cell, instead of being triggered by the network equipment and switching immediately, thereby improving the switching robustness.

[0008] That is to say, the original cell network device performs cell switching by sending an LTM switching instruction to the terminal device. Then, the cell switching method is triggered by the network device and the terminal device performs switching immediately after receiving the LTM switching instruction. There is a problem of poor switching robustness. Therefore, the technical solution provided by the embodiment of the present application is that the original cell network device sends switching configuration information. When the terminal device evaluates a candidate cell that meets the execution conditions based on the switching configuration information, it uses the beam of the candidate cell that meets the execution conditions to access the target cell. Whether the candidate cell that meets the execution conditions is evaluated is the result of autonomous operation on the terminal device side. Therefore, if the candidate cell that meets the execution conditions is not evaluated, the cell switching may not be performed. Therefore, the terminal device can perform cell switching when the candidate cell that meets the execution conditions is evaluated, or not perform cell switching when the candidate cell that meets the execution conditions is not evaluated, thereby improving the switching robustness.

[0009] In conjunction with the first aspect, in certain implementations of the first aspect, the handover configuration information includes execution condition information of each candidate cell and conditional LTM configuration information;

[0010] The execution condition information includes at least one of the following information:

[0011] (1) First condition LTM execution event;

[0012] (2) Second-condition LTM execution condition information. 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 measurement quality when the candidate cell meets the execution condition. The second threshold value is used to indicate the threshold value of the beam corresponding measurement quality when the original cell meets the execution condition.

[0013] It should be understood that the first-condition LTM execution event and / or the second-condition LTM execution condition information described above may constitute execution condition information corresponding to each candidate cell, with different execution condition information representing different execution conditions. It should also be understood that a candidate cell may correspond to one or more execution conditions, and that different candidate cells may correspond to the same or different execution condition information, which is not limited in this embodiment.

[0014] It should be understood that the specific form of the first-condition LTM execution event can be any form representing "an event in which the beam-corresponding measurement quality of the candidate cell is higher than the beam-corresponding measurement quality of the original cell", such as a number, a field, or other form, and this application is not limited to this. Similarly, the specific form of the second-condition LTM execution condition information can be any form representing "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", such as a number, a field, or other form, and this application is not limited to this.

[0015] The LTM configuration information for the above conditions includes: the duration of attempting to access the target cell through the selected beam.

[0016] It should be understood that the conditional LTM configuration information can be understood as configuration information for implementing conditional LTM cell switching. In addition, the duration of attempting to access the target cell through the selected beam is less than the corresponding timing duration of the timeout timer T304.

[0017] It should be noted that the specific form of the duration of attempting to access the target cell through the selected beam can be any form that represents the "duration of attempting to access the target cell through the selected beam", such as a number or field or other form, and this application does not limit this.

[0018] It should also be understood that conditional LTM configuration information can be configured together with execution condition information corresponding to each candidate cell. That is, for conditional LTM cell handover, the original cell network equipment will configure the candidate cell configuration information and conditional LTM configuration information. The conditional LTM configuration information may include the duration of the attempt to access the target cell via the selected beam, and the candidate cell configuration information may include execution condition information corresponding to each candidate cell and measurement information for each candidate cell. This combined configuration can reduce signaling overhead.

[0019] Optionally, the first conditional LTM execution event includes any one of the following:

[0020] (11) The average of the measurement qualities 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;

[0021] (12) The measurement quality corresponding to any beam of the candidate cell is greater than or equal to the measurement quality corresponding to any beam of the original cell;

[0022] (13) The candidate cell has at least one beam whose corresponding measurement quality is greater than or equal to the measurement quality of any beam of the original cell;

[0023] (14) The candidate cell has at least one beam with a measurement quality greater than or equal to the measurement quality of at least one beam in the original cell;

[0024] (15) The average of the measurement qualities corresponding to the N better beams of the candidate cell is greater than or equal to the measurement qualities corresponding to the N better beams of the original cell, where N is an integer greater than 1.

[0025] It should be understood that the specific content of different first-condition LTM execution events varies. Therefore, the embodiments of the present 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 content can provide a corresponding execution condition, thereby enabling the terminal device to effectively evaluate the candidate cell. This improves the selectivity of the execution condition information.

[0026] It should be noted that the specific forms of expression of the above-mentioned conditional LTM execution events can be any form that represents the corresponding execution conditions, such as numbers, fields or other forms, and this application does not limit this.

[0027] Optionally, the first threshold includes any one of the following:

[0028] (21) The first threshold value is the threshold value at which the measurement qualities of K better beams in the candidate cell are greater than or equal to, where K is an integer greater than or equal to 1;

[0029] (22) The first threshold value is a threshold value greater than or equal to the corresponding measurement quality of any beam in the candidate cell;

[0030] (23) The first threshold value is the threshold value at which the average value of the measurement quality corresponding to M better beams in the candidate cell is greater than or equal to, where M is an integer greater than 1.

[0031] It should be understood that the specific content of different first threshold values ​​varies. Therefore, the embodiments of the present application do not specifically limit the specific content of the first threshold value. That is, any combination of the first threshold value and the second threshold value containing any content can provide corresponding execution conditions, thereby enabling the terminal device to effectively evaluate the candidate cell. This improves the selectivity of the execution condition information.

[0032] Optionally, the second threshold value includes any one of the following:

[0033] (24) The second threshold value is the threshold value at which the measurement qualities of L better beams in the original cell are all less than or equal to the threshold value, where L is an integer greater than or equal to 1;

[0034] (25) The second threshold value is a threshold value that the measurement quality corresponding to any beam in the original cell is less than or equal to;

[0035] (26) The second threshold value is the threshold value at which the average value of the measurement quality corresponding to the existence of P better beams in the original cell is less than or equal to, where P is an integer greater than 1.

[0036] It should be understood that the specific content of different second thresholds varies. Therefore, the embodiments of the present application do not specifically limit the specific content of the second threshold. That is, the combination of a first threshold containing any content and a second threshold containing any content can provide a corresponding execution condition, thereby enabling the terminal device to effectively evaluate the candidate cell. This improves the selectivity of the execution condition information.

[0037] It should be noted that the specific expression form of each threshold value corresponding to each of the above cells can be any form that represents the corresponding execution conditions, such as numbers, fields or other forms, and this application does not limit this.

[0038] Optionally, the candidate cells that meet the execution conditions include: candidate cells that meet the first condition LTM execution event;

[0039] Alternatively, a candidate cell that meets both the first threshold and the second threshold;

[0040] Alternatively, the LTM execution event satisfies the first condition and the candidate cells satisfy the first threshold and the second threshold.

[0041] 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 meet different first condition LTM execution events. Therefore, candidate cells that meet different first condition LTM execution conditions improve the selectivity of candidate cells.

[0042] 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 meet different second threshold values, and the candidate cells that meet different first threshold values ​​and / or meet different second threshold values ​​improve the selectivity of the candidate cells.

[0043] 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 meet different first-condition LTM execution events and different first thresholds and / or different second thresholds. Thus, candidate cells that meet different first-condition LTM execution events and different first thresholds and / or different second thresholds improve the selectivity of candidate cells. Furthermore, different types of candidate cells further improve the selectivity of candidate cells.

[0044] Optionally, the beam of the candidate cell that meets the execution condition is:

[0045] Any first beam or a first beam with greater measurement quality; the first beam is a beam of a candidate cell that meets the first condition LTM execution event, or a beam of a candidate cell that meets the first threshold value and the second threshold value, or a beam of a candidate cell that meets the first condition LTM execution event and meets the first threshold value and the second threshold value.

[0046] It should be understood that there are three types of candidate cells that meet the execution conditions, so when one type of candidate cell is evaluated, the terminal can execute the corresponding beam determination solution.

[0047] 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 switching, thereby improving the universality of the cell switching.

[0048] Optionally, if there are multiple first beams, using a beam of a candidate cell that meets the execution condition to access the target cell to complete the cell handover includes:

[0049] When any first beam or a first beam with a higher measurement quality is used to access the target cell, a first timer and a timeout timer T304 are started, where the first timer is a timer corresponding to the duration of the attempt to access the target cell through the selected beam;

[0050] If the target cell is successfully accessed before the first timer expires, the cell handover is completed;

[0051] If the target cell is not successfully accessed before the first timer times out and T304 has not timed out, another first beam is used to access the target cell and the first timer is restarted until T304 times out or the target cell is successfully accessed.

[0052] It should be understood that the timing duration of the attempt to access the target cell controls the time of the access operation corresponding to "accessing the target cell using any first beam or the first beam with larger measurement quality". If the target cell is not successfully accessed before the first timer expires and T304 has not timed out, it means that the access is not successful within the timing duration of the attempt to access the target cell. The beam reselection can be entered in time, and then the reselected beam can be used to re-access the target cell to avoid the low cell switching efficiency caused by the access operation time corresponding to the same beam being too long, thereby improving the success rate and efficiency of the cell switching.

[0053] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes:

[0054] Receive Medium Access Control (MAC) Control Element (CE) signaling, the MAC CE signaling includes an activated Transmission Configuration Indication (TCI) status identifier corresponding to the candidate cell; when receiving the MAC CE signaling, a candidate cell that meets the execution conditions has been evaluated. It should be understood that the MAC CE signaling includes an activated 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, so 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 determines the beam of the candidate cell that meets the execution conditions based on the MAC CE signaling, and uses the beam to access the target cell to improve the success rate of cell switching.

[0055] Optionally, the candidate cells that meet the execution conditions include:

[0056] The first candidate cell is a candidate cell that satisfies the first condition LTM execution event and includes a corresponding TCI state identifier in the MAC CE signaling;

[0057] or,

[0058] The second candidate cell is a candidate cell that meets the first threshold and the second threshold and includes a corresponding TCI state identifier in the MAC CE signaling;

[0059] or,

[0060] The third candidate cell; wherein 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 includes the corresponding TCI state identifier in the MAC CE signaling.

[0061] It should be understood that when a terminal device receives MAC CE signaling, if the execution condition information includes different first-condition LTM execution events, the terminal device can evaluate candidate cells that meet different first-condition LTM execution events and have corresponding TCI status identifiers included in the MAC CE signaling. Thus, candidate cells that meet different first-condition LTM execution conditions and have corresponding TCI status identifiers included in the MAC CE signaling can improve the selectivity of candidate cells.

[0062] It should also be understood that when the terminal device receives MAC CE signaling, 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 meet different second threshold values ​​and include corresponding TCI status identifiers in the MAC CE signaling, and candidate cells that meet different first threshold values ​​and / or meet different second threshold values ​​and include corresponding TCI status identifiers in the MAC CE signaling, which can improve the selectivity of candidate cells.

[0063] 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 meet different first-condition LTM execution events and meet different first thresholds and / or meet different second thresholds and include corresponding TCI status identifiers in MAC CE signaling. Therefore, candidate cells that meet different first-condition LTM execution events and meet different first thresholds and / or meet different second thresholds and include corresponding TCI status identifiers in MAC CE signaling can improve the selectivity of candidate cells. Moreover, different types of candidate cells further improve the selectivity of candidate cells.

[0064] Optionally, the target TCI state identifier in the MAC CE signaling is one; the target TCI state identifier is the TCI state identifier corresponding to the first candidate cell, or the target TCI state identifier is the TCI state identifier corresponding to the second candidate cell, or the target TCI state identifier is the TCI state identifier corresponding to the third candidate cell;

[0065] 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 state identifier included in the MAC CE signaling.

[0066] That is to say, when the target TCI state is identified as one in the MAC CE signaling, the terminal device can determine the beam of the "candidate cell that meets the execution conditions" when different execution condition information corresponds to the same or different types of "candidate cells that meet the execution conditions", and then use the beam of the "candidate cell that meets the execution conditions" to access the target cell, which can effectively solve the inconsistency problem caused by the simultaneous use of different beam determination schemes, such as "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".

[0067] Optionally, the target TCI state identifier in the MAC CE signaling is multiple; the target TCI state identifier is the TCI state identifier corresponding to the first candidate cell, or the target TCI state identifier is the TCI state identifier corresponding to the second candidate cell; or the target TCI state identifier is the TCI state identifier corresponding to the third candidate cell;

[0068] The beam of the candidate cell that meets the execution conditions is the third beam, which is one of the following beams:

[0069] The beam corresponding to the first target TCI state identifier included in the MAC CE signaling, where the first target TCI state identifier is the target TCI state identifier arranged at a preset position;

[0070] or,

[0071] The beam corresponding to the second target TCI state identifier included in the MAC CE signaling is the beam corresponding to the second target TCI state identifier, which successfully accesses the beam corresponding to the target cell before the duration of the attempt to access the target cell through the selected beam times out.

[0072] 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 embodiment of the present application does not specifically limit the specific position of the preset position.

[0073] That is to say, 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" when different execution condition information corresponds to the same or different types of "candidate cells that meet 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 inconsistency problem 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 the simultaneous use of different beam determination schemes.

[0074] Optionally, if the third beam is a beam corresponding to the second target TCI state identifier included in the MAC CE signaling, accessing the target cell using the beam of the candidate cell that meets the execution conditions to complete the cell handover includes:

[0075] When a beam corresponding to a target TCI state identifier is used to access the target cell, a first timer and a timeout timer T304 are started. The first timer is a timer corresponding to the duration of the attempt to access the target cell through the selected beam.

[0076] If the target cell is successfully accessed before the first timer expires, the cell handover is completed;

[0077] If the target cell is not successfully accessed before the first timer expires and T304 has not timed out, the beam corresponding to another target TCI state identifier is used to access the target cell and the first timer is restarted until T304 times out or the target cell is successfully accessed.

[0078] It should be understood that the timing duration of the attempt to access the target cell controls the time of the access operation corresponding to "accessing the target cell using a beam corresponding to a target TCI status identifier". If the target cell is not successfully accessed before the first timer expires and T304 has not timed out, it means that the access is not successful within the timing duration of the attempt to access the target cell. The beam reselection can be entered in time, and then the reselected beam can be used to re-access the target cell to avoid the low cell switching efficiency caused by the access operation time corresponding to the same beam being too long, thereby improving the success rate and efficiency of the cell switching.

[0079] Optionally, the handover configuration information is carried in Radio Resource Control (RRC) reconfiguration information or dedicated signaling.

[0080] It should be understood that the embodiment of the present application carries the switching configuration information in the radio resource control RRC reconfiguration information, which reduces the signaling overhead and effectively avoids the waste of communication resources; or carries the switching configuration information in proprietary signaling, which can improve the parsing speed of the execution condition information.

[0081] In a second aspect, embodiments of the present application provide a cell handover method, which can be performed by a network device, which can be an original cell network device, or can be performed by a component (such as a chip or circuit) configured in the original cell network device. This application is not limited to this.

[0082] For example, the method includes: sending conditional layer 1 / 2 triggered mobility LTM switching configuration information to the terminal device, the switching configuration information is used to configure the candidate cell to perform conditional LTM cell switching when the execution condition is met; the candidate cell is one or more.

[0083] That is to say, how the terminal device performs the LTM cell switching condition is triggered by the original cell network device, but is not entirely decided by the original cell network device. Therefore, when the terminal device evaluates the candidate cell that meets the execution conditions based on the switching configuration information, it uses the beam of the candidate cell that meets the execution conditions to access the target cell. Whether the candidate cell that meets the execution conditions is evaluated is the result of autonomous operation on the terminal device side. Therefore, if the candidate cell that meets the execution conditions is not evaluated, the cell switching may not be performed. Therefore, the terminal device can perform cell switching when the candidate cell that meets the execution conditions is evaluated, and may not perform cell switching when the candidate cell that meets the execution conditions is not evaluated, thereby improving the switching robustness.

[0084] In conjunction with the second aspect, in certain implementations of the second aspect, the handover configuration information includes execution condition information of each candidate cell and conditional LTM configuration information;

[0085] The execution condition information includes at least one of the following information:

[0086] The first condition LTM executes the event;

[0087] 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 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 measurement quality when the original cell meets the execution condition.

[0088] It should be understood that in the second aspect, the interpretation of each information included in the execution condition information is consistent with the interpretation of each information included in the execution condition information in the first aspect, and will not be repeated here.

[0089] It should be noted that the execution condition information may include different contents, and when the execution condition information includes different contents, it corresponds to different execution conditions, so as to improve the flexibility of evaluating the candidate cells.

[0090] It should also be understood that the conditional LTM configuration information includes: the duration of attempting to access the target cell through the selected beam.

[0091] It should also be understood that the duration of attempting to access the target cell through the selected beam is less than the corresponding timing duration of the timeout timer T304.

[0092] It should be noted that the specific form of the duration of attempting to access the target cell through the selected beam can be any form that represents the "duration of attempting to access the target cell through the selected beam", such as a number or field or other form, and this application does not limit this.

[0093] Optionally, the first conditional LTM execution event includes any one of the following:

[0094] (11) The average of the measurement qualities 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;

[0095] (12) The measurement quality corresponding to any beam of the candidate cell is greater than or equal to the measurement quality corresponding to any beam of the original cell;

[0096] (13) The candidate cell has at least one beam whose corresponding measurement quality is greater than or equal to the measurement quality of any beam of the original cell;

[0097] (14) The candidate cell has at least one beam with a measurement quality greater than or equal to the measurement quality of at least one beam in the original cell;

[0098] (15) The average of the measurement qualities corresponding to the N better beams of the candidate cell is greater than or equal to the measurement qualities corresponding to the N better beams of the original cell, where N is an integer greater than 1.

[0099] It should be understood that the specific content of different first-condition LTM execution events varies. Therefore, the embodiments of the present 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 content can provide a corresponding execution condition, thereby enabling the terminal device to effectively evaluate the candidate cell. This improves the selectivity of the execution condition information.

[0100] Optionally, the first threshold includes any one of the following:

[0101] (21) The first threshold value is the threshold value at which the measurement qualities of K better beams in the candidate cell are greater than or equal to, where K is an integer greater than or equal to 1;

[0102] (22) The first threshold value is a threshold value greater than or equal to the corresponding measurement quality of any beam in the candidate cell;

[0103] (23) The first threshold value is the threshold value at which the average value of the measurement quality corresponding to M better beams in the candidate cell is greater than or equal to, where M is an integer greater than 1.

[0104] It should be understood that the specific content of different first threshold values ​​varies. Therefore, the embodiments of the present application do not specifically limit the specific content of the first threshold value. That is, any combination of the first threshold value and the second threshold value containing any content can provide corresponding execution conditions, thereby enabling the terminal device to effectively evaluate the candidate cell. This improves the selectivity of the execution condition information.

[0105] Optionally, the second threshold value includes any one of the following:

[0106] (24) The second threshold value is the threshold value at which the measurement qualities of L better beams in the original cell are all less than or equal to the threshold value, where L is an integer greater than or equal to 1;

[0107] (25) The second threshold value is a threshold value that the measurement quality corresponding to any beam in the original cell is less than or equal to;

[0108] (26) The second threshold value is the threshold value at which the average value of the measurement quality corresponding to the existence of P better beams in the original cell is less than or equal to, where P is an integer greater than 1.

[0109] It should be understood that the specific content of different second thresholds varies. Therefore, the embodiments of the present application do not specifically limit the specific content of the second threshold. That is, the combination of a first threshold containing any content and a second threshold containing any content can provide a corresponding execution condition, thereby enabling the terminal device to effectively evaluate the candidate cell. This improves the selectivity of the execution condition information.

[0110] In conjunction with the second aspect, in certain implementations of the second aspect, the method further includes:

[0111] 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 the candidate cell that meets the execution conditions.

[0112] It should be understood that the MAC CE signaling includes the activated 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 determines the beam of the candidate cell that meets the execution conditions based on the MAC CE signaling, and uses the beam to access the target cell to improve the success rate of cell switching.

[0113] In conjunction with the second aspect, in certain implementations of the second aspect, for a candidate cell whose corresponding TCI status identifier in the MAC CE signaling is one, the method further includes:

[0114] The corresponding TCI status identifier in the MAC CE signaling is sent to the candidate cell network device, where the candidate cell includes the first candidate cell, the second candidate cell, or the third candidate cell. 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 includes the corresponding TCI status identifier in the MAC CE signaling. 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 includes the corresponding TCI status identifier in the MAC CE signaling.

[0115] The original cell network device sends a MAC CE signaling including the activated transmission configuration index TCI status identifier corresponding to the candidate cell to the terminal device, and also sends the TCI status identifier corresponding to the candidate cell network device in the MAC CE signaling to all candidate cell network devices. This allows all candidate cell network devices that may become target cells to know in advance the beam corresponding to the TCI status identifier in the cell that the terminal device may use, thereby improving the cell success rate.

[0116] Optionally, for a candidate cell having a TCI status identifier corresponding to the MAC CE signaling as multiple, the method further includes:

[0117] Sending a TCI status identifier arranged at a preset position among a plurality of corresponding TCI status identifiers to the candidate cell network device;

[0118] Alternatively, multiple corresponding TCI status identifiers and indication information are sent to the candidate cell network device, where the indication information is used to indicate that a TCI status identifier arranged at a preset position is determined from the multiple corresponding TCI status identifiers;

[0119] Among them, the candidate cells include the first candidate cell or the second candidate cell or the third candidate cell, 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 includes the corresponding TCI status identifier in the MAC CE signaling, and 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 includes the corresponding TCI status identifier in the MAC CE signaling.

[0120] That is to say, by using the above two methods of sending information to the candidate cell network equipment, the candidate cell network equipment can be informed in advance of the beam of the corresponding candidate cell that the terminal device may adopt before the terminal device "adopts the beam of the candidate cell that meets the execution conditions to access the target cell", which can improve the success rate of cell switching.

[0121] Optionally, the handover configuration information is carried in radio resource control RRC reconfiguration information or dedicated signaling.

[0122] It should be understood that the original cell network equipment carries the switching configuration information in the radio resource control RRC reconfiguration information, which reduces signaling overhead and effectively avoids waste of communication resources; or carries the switching configuration information in proprietary signaling, which can improve the parsing speed of execution condition information.

[0123] In a third aspect, an embodiment of the present application provides a cell switching device, comprising modules or units for executing the method in the first aspect and any possible implementation manner of the first aspect.

[0124] In a fourth aspect, a cell switching device is provided, comprising modules or units for executing the method in the second aspect and any possible implementation manner of the second aspect.

[0125] In a fifth aspect, a cell handover apparatus is provided, comprising a processor. The processor is coupled to a memory and configured to execute instructions in the memory to implement the method of the first aspect and any possible implementation of the first aspect. Optionally, the apparatus further comprises a memory. Optionally, the apparatus further comprises a communication interface, the processor being coupled to the communication interface.

[0126] In one implementation, the cell switching device is a terminal device. When the cell switching device is a terminal device, the communication interface may be a transceiver, or an input / output interface.

[0127] In another implementation, the cell switching device is a chip configured in a terminal device. When the cell switching device is a chip configured in a terminal device, the communication interface may be an input / output interface.

[0128] Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0129] In a sixth aspect, a cell handover apparatus is provided, comprising a processor. The processor is coupled to a memory and configured to execute instructions in the memory to implement the method of the second aspect and any possible implementation thereof. Optionally, the apparatus further comprises a memory. Optionally, the apparatus further comprises a communication interface, the processor being coupled to the communication interface.

[0130] In one implementation, the cell switching device is a network device. When the cell switching device is a network device, the communication interface may be a transceiver, or an input / output interface.

[0131] In another implementation, the cell switching device is a chip configured in a network device. When the cell switching device is a chip configured in a network device, the communication interface may be an input / output interface.

[0132] Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0133] In a seventh aspect, a processor is provided, comprising: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive a signal via the input circuit and transmit a signal via the output circuit, so that the processor executes the method of any possible implementation of the first to second aspects and any possible implementation of the first to second aspects.

[0134] In a specific implementation, the processor may be one or more chips, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a trigger, or various logic circuits. The input signal received by the input circuit may be, for example, but not limited to, received and input by a receiver, and the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by a transmitter. The input circuit and the output circuit may be the same circuit, which functions as an input circuit and an output circuit at different times. The embodiments of the present application do not limit the specific implementation of the processor and various circuits.

[0135] In an eighth aspect, a cell switching apparatus is provided, comprising a processor and a memory. The processor is configured to read instructions stored in the memory, receive signals via a receiver, and transmit signals via a transmitter to execute the method of any possible implementation of the first to second aspects and any possible implementation of the first to second aspects.

[0136] Optionally, there are one or more processors and one or more memories.

[0137] Optionally, the memory may be integrated with the processor, or the memory may be provided separately from the processor.

[0138] In the specific implementation process, the memory can be a non-transitory memory, such as a read-only memory (ROM), which can be integrated with the processor on the same chip or can be set on different chips. The embodiments of the present application do not limit the type of memory and the setting method of the memory and the processor.

[0139] It should be understood that related data exchange processes, such as sending "handover configuration information for configuring a candidate cell to perform conditional LTM cell handover when an execution condition is met," can be the process of the processor outputting "handover configuration information for configuring a candidate cell to perform conditional LTM cell handover when an execution condition is met," and 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 be received from the receiver. The transmitter and receiver can be collectively referred to as a transceiver.

[0140] The cell switching device in the eighth aspect described above may be one or more chips. The processor in the cell switching device may be implemented in hardware or software. When implemented in hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory. The memory may be integrated into the processor or located independently of the processor.

[0141] In the ninth aspect, an embodiment of the present application provides 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, the processor is used to execute the computer execution instructions stored in the memory, and when executing the computer execution instructions stored in the memory, the processor is used to instruct the terminal device to execute the method described in the above-mentioned first aspect and any possible implementation method of the first aspect.

[0142] In the tenth aspect, an embodiment of the present application provides a network 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 run computer execution instructions. When executing the computer execution instructions stored in the memory, the processor is used to instruct the network device to execute the method described in the above second aspect and any possible implementation method of the second aspect.

[0143] In the eleventh aspect, an embodiment of the present application provides a computer-readable storage medium, in which a computer program or instruction is stored. When the computer program or instruction is run on a computer, the computer executes the method described in the first aspect to the second aspect and any possible implementation of the first aspect to the second aspect.

[0144] In a twelfth aspect, the present application provides a chip or chip system, comprising at least one processor and a communication interface, wherein the communication interface and the at least one processor are interconnected via a line, and the at least one processor is configured to execute a computer program or instruction to perform the method described in the first aspect or any possible implementation of the first aspect. The communication interface in the chip may be an input / output interface, a pin, or a circuit.

[0145] In the thirteenth aspect, an embodiment of the present application provides a computer program product comprising a computer program, which, when the computer program runs on a computer, enables the computer to execute the method described in the first aspect to the second aspect and any possible implementation method of the first aspect to the second aspect.

[0146] In one possible implementation, the chip or chip system described above in this application further includes at least one memory, in which instructions are stored. The memory may be a storage unit within the chip, such as a register, a cache, etc., or a storage unit of the chip (e.g., a read-only memory, a random access memory, etc.).

[0147] It should be understood that the third, fifth and ninth aspects of the present application correspond to the technical solution of the first aspect of the present application, the fourth, sixth and tenth aspects of the present application correspond to the technical solution of the second aspect of the present application, and the seventh, eighth, and eleventh to thirteenth aspects of the present application correspond to the technical solutions of the first and second aspects of the present application. The beneficial effects achieved by each aspect and the corresponding feasible implementation methods are similar and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0148] FIG1 is a schematic diagram of the architecture of a communication system 100 used in an embodiment of the present application;

[0149] FIG2 is a diagram exemplarily illustrating signaling interactions between a terminal device and each network device in a CHO process 200;

[0150] FIG3 is a diagram exemplarily illustrating signaling interactions between a terminal device and each network device in an LTM process 300;

[0151] FIG4 is a schematic flow chart illustrating a cell switching method 400 provided in an embodiment of the present application from the perspective of device interaction;

[0152] FIG5 is a schematic structural diagram of MAC CE signaling;

[0153] FIG6 is a schematic flow chart illustrating a cell switching method 600 provided in an embodiment of the present application from the perspective of device interaction;

[0154] FIG7 is a schematic flow chart illustrating a cell switching method 700 provided in an embodiment of the present application from the perspective of device interaction;

[0155] FIG8 is a schematic block diagram of a cell switching apparatus 8000 provided in an embodiment of the present application;

[0156] FIG9 is a schematic diagram of a possible structure of a terminal device 9000 provided in an embodiment of the present application;

[0157] FIG10 is a schematic diagram of a possible structure of a network device provided in an embodiment of the present application, for example, a schematic diagram of the structure of a base station 1000 . DETAILED DESCRIPTION

[0158] To facilitate understanding of the cell switching method, device, storage medium, and product provided in the embodiments of the present application, the cell switching method, its system architecture, and application scenarios provided in the embodiments of the present application are described below. It is understood that the system architecture and application scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions provided in the embodiments of the present application.

[0159] The technical solutions of the embodiments of the present application can be applied to communication scenarios in various communication systems, such as: Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD) system, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, future fifth generation (5G) communication system or new radio access technology (NR), vehicle-to-X (V2X), where V2X may include vehicle-to-network (V2N), vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P), etc., Long Term Evolution-Vehicle (LTE-V), Internet of Vehicles, machine type communication (MTC), etc. communication (MTC), Internet of Things (IoT), Long Term Evolution-Machine (LTE-M), Machine to Machine (M2M), etc.

[0160] Furthermore, the present application can be applied to a variety of 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, dual connectivity (DC) or multi-connection scenarios of multiple base stations and terminals. It should be noted that the above specific communication application scenarios are only examples and do not create limitations. Specifically, it can be applied to scenarios where LTM switching and conditional handover (CHO) can coexist in the above-mentioned specific communication scenarios.

[0161] To facilitate understanding of the embodiments of the present application, a communication system applicable to the embodiments of the present application is first described in detail in conjunction with Figure 1. Figure 1 is a schematic diagram of the architecture of a communication system 100 applied in the embodiments of the present application. As shown in Figure 1, the communication system 100 may include at least one terminal device, such as the terminal device 110 shown in Figure 1. The communication system 100 may also include at least one network device, such as the original cell network device 120 shown in Figure 1. The terminal device 110 may be mobile or fixed. The original cell network device 120 is a device that can communicate with the terminal device 110 via a wireless link, such as a base station or a base station controller. The original cell network device 120 can provide communication coverage for a specific geographical area, and can communicate with terminal devices located in the coverage area (cell).

[0162] FIG1 exemplarily shows 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, in order to distinguish the difference between network devices before and after the terminal device performs a handover, the communication system 100 may include an original cell network device and a 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 may also include at least one primary and secondary cell network device, and the coverage of the primary cell network device and the primary and secondary cell network device may include other numbers of terminal devices, which is not limited in this embodiment of the present application. For example, in order to distinguish the difference between network devices before and after the terminal device performs a handover under dual connection, the communication system 100 may include an original primary cell network device and a target primary cell network device.

[0163] Each of the above-mentioned communication devices, such as the terminal device 110 and the original cell network device 120 in Figure 1, can be configured with multiple antennas. The multiple antennas may include at least one transmitting antenna for sending signals and at least one receiving antenna for receiving signals. In addition, each communication device also includes a transmitter chain and a receiver chain. Those skilled in the art will understand that they may include multiple components related to signal transmission and reception (such as processors, modulators, multiplexers, demodulators, demultiplexers, or antennas, etc.). Therefore, the network device and the terminal device can communicate using multi-antenna technology.

[0164] Optionally, the wireless communication system 100 may further include other network entities such as a network controller and a mobility management entity, but the embodiments of the present application are not limited thereto.

[0165] In the embodiment of the present application, the network device can be any device with wireless transceiver function. The device includes, but is not limited to, an evolved Node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a Home Evolved NodeB (HNB), a Base Band Unit (BBU), an Access Point (AP) in a Wireless Fidelity (WIFI) system, a wireless relay node, a wireless backhaul node, a transmission point (TP) or a transmission and reception point (TRP), etc. It can also be a next generation Node B (gNB) in a 5G, such as NR, system, 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 a transmission point, such as a baseband unit (BBU) or a distributed unit (DPU). unit, DU) etc.

[0166] In some deployments, a gNB may include a centralized unit (CU) and a DU. The gNB may also include an active antenna unit (AAU). The CU implements some gNB functions, while the DU implements some gNB functions. For example, the CU is responsible for processing non-real-time protocols and services, and implementing radio resource control (RRC) and packet data convergence protocol (PDCP) layer functions. The DU is responsible for processing physical layer protocols and real-time services, and implementing radio link control (RLC), media access control (MAC), and physical (PHY) layer functions. The AAU implements some physical layer processing functions, RF processing, and active antenna-related functions. Because RRC layer information ultimately becomes PHY layer information, or is converted from PHY layer information, in this architecture, higher-layer signaling, such as RRC layer signaling, can also be considered to be sent by the DU, or by both the DU and the AAU. It is understood that a network device may include one or more of a CU node, a DU node, or an AAU node. In addition, the CU may be classified as a network device in an access network (radio access network, RAN), or may be classified as a network device in a core network (core network, CN), which is not limited in this application.

[0167] Network equipment provides services for cells, and terminal devices communicate with cells through transmission resources allocated by the network equipment (for example, frequency domain resources, or spectrum resources). The cell can belong to a macro base station (for example, a macro eNB or macro gNB), or to a base station corresponding to a small cell. Small cells here can include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0168] In an embodiment of the present 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 device. The terminal device in the embodiments of the present application can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved public land mobile communication network (PLMN), etc.

[0169] Wearable devices, also known as wearable smart devices, are a general term for wearable devices that use wearable technology to intelligently design and develop wearable devices for daily wear, such as glasses, gloves, watches, clothing, and shoes. Wearable devices are portable devices that are worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not just hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include those that are fully functional, large in size, and can achieve full or partial functions without relying on smartphones, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0170] Furthermore, the terminal device can also be a terminal device in the Internet of Things (IoT) system. IoT is an important component of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing an intelligent network that interconnects people, machines, and things.

[0171] This application does not limit the specific form of the terminal device.

[0172] To facilitate a clear description of the technical solutions of the embodiments of the present application, some of the terms and technologies involved in the embodiments of the present application are briefly introduced below:

[0173] 1. Conditional handover: This is the process of switching from the current CHO cell to a CHO candidate cell when a terminal device is triggered by a change in service conditions or channel quality. The process of switching from the current CHO cell to a CHO candidate cell can be referred to as the CHO process.

[0174] Figure 2 is a diagram exemplarily illustrating signaling interactions between a terminal device and various network devices in a CHO process 200. The CHO process 200 will be briefly described below with reference to Figure 2. The CHO process 200 may specifically include S201 to S209 below.

[0175] S201. The terminal device sends measurement results to the original cell network device.

[0176] S202: The original cell network device determines to execute CHO.

[0177] The original cell network equipment determines whether to perform CHO based on the measurement result.

[0178] S203: The original cell network device sends a CHO handover request to the candidate cell network device.

[0179] The candidate cells include target cells and target potential cells.

[0180] S204: The candidate cell network device sends a CHO handover request response to the original cell network device.

[0181] S204 enables the original cell network device to obtain the CHO candidate cell configuration information and execution conditions.

[0182] It should be understood that this execution condition is a CHO execution condition, which can be any one of Event A3, Event A4, and Event A5, or any two of Event A3, Event A4, and Event A5, or Event A3, Event A4, and Event A5. Event A3 is when the quality of the neighboring cell is better than that of the original cell; this event triggers a handover. Event A4 is when the quality of the neighboring cell is greater than an absolute threshold; this event triggers a handover. Event A5 is when the quality of the original cell is less than an absolute threshold and the quality of the neighboring cell is greater than an absolute threshold; this event triggers a handover.

[0183] S205. The original cell network device sends an RRC reconfiguration message to the terminal device.

[0184] In S205, the CHO candidate cell configuration information and execution conditions are sent to the terminal device via an RRC reconfiguration message. It should be understood that the original cell network device configures a maximum of 8 candidate cells and corresponding execution conditions.

[0185] S206. The terminal device sends an RRC reconfiguration completion message to the original cell network device.

[0186] S207. The terminal device performs CHO evaluation.

[0187] It should be understood that the terminal device performs CHO evaluation based on the CHO candidate cell configuration information and the execution condition to determine the target cell. When at least one candidate cell meets the corresponding execution condition, S208 is executed.

[0188] S208. The terminal device disconnects from the original cell network device.

[0189] S209. The terminal device is connected to the target cell network device.

[0190] At this point, the CHO process is completed.

[0191] 2. Layer 1 / 2 Triggered Mobility: LTM is the process in which, when a terminal device is connected, the original cell network equipment performs cell handover on the terminal device based on the L1 measurement results reported by the terminal device and the terminal device's support for LTM.

[0192] Figure 3 is a diagram exemplarily illustrating signaling interactions between a terminal device and various network devices in an LTM process 300. The LTM process 300 is briefly described below with reference to Figure 3. The LTM process 300 may specifically include S301 to S312 below.

[0193] S301. The terminal device sends L1 measurement results to the original cell network device.

[0194] S302: The original cell network device determines to perform LTM switching.

[0195] It should be understood that the original cell network device determines the terminal device's support capability for LTM based on the L1 measurement result, and executes S303 when determining to execute LTM.

[0196] S303: The original cell network device sends an LTM handover request to the candidate cell network device.

[0197] The candidate cells include target cells and potential target cells.

[0198] S304: The candidate cell network device sends an LTM handover request response to the original cell network device.

[0199] In S304, the original cell network device obtains the LTM candidate cell configuration information.

[0200] S305. The original cell network device sends an RRC reconfiguration message to the terminal device.

[0201] The RRC reconfiguration message includes LTM candidate cell configuration information. The RRC reconfiguration message is used to instruct the terminal device to perform an uplink synchronization process and a downlink synchronization process on the candidate cell.

[0202] S306. The terminal device sends an RRC reconfiguration completion message to the original cell network device.

[0203] S307. The terminal device performs a downlink synchronization process for the LTM candidate cell.

[0204] S308. The terminal device performs an uplink synchronization process for the LTM candidate cell.

[0205] S309. The terminal device sends the L1 measurement result to the original cell network device.

[0206] Among them, S309 is to enable the original cell network equipment to determine the target cell.

[0207] S310: The original cell network device sends an LTM switching instruction to the terminal device.

[0208] Among them, the LTM switching instruction may include MAC CE indication information, and the MAC CE indication information may include: timing advance (Timing Advance, TA), transmission configuration indication state (Transmission Configuration Indication State, TCI State) sequence number (IDentity, ID), contention free random access (Contention Free Random Access, CFRA) resource information, and LTM candidate cell configuration information identifier.

[0209] It should be understood that when the TA is valid, its specific value will be included in the MAC CE indication information, and when it is invalid, it will not be included in the MAC CE indication information.

[0210] It should also be understood that during the process of performing uplink synchronization for each candidate cell network device, if the RRC reconfiguration message indicates that the terminal device is to measure the TA 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 command (Physical Downlink Control Channel, PDCCH) order to obtain the timing advance of the candidate cell network device, and the terminal device initiates CFRA to the candidate cell network device 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.

[0211] It should also be understood that if the MAC CE indication information includes a specific value of the TA, the terminal device can achieve switching by sending an uplink signaling or an uplink data packet or other uplink information to the target cell network device. The specific sending content is not limited in this application. If the MAC CE indication information does not include a specific value of the TA, the terminal device can measure the TA corresponding to the target cell network device on its own, and can send an uplink signaling or an uplink data packet or other uplink information to the target cell network device based on the measurement result to achieve switching. The specific sending content is not limited in this application.

[0212] S311. The terminal device disconnects from the original cell network device.

[0213] S312: The terminal device performs a random access process to the target cell network device to complete the LTM handover.

[0214] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0215] To facilitate understanding of the embodiments of the present application, the following description is first made:

[0216] First, to facilitate a clear description of the technical solutions of the embodiments of the present application, the embodiments of the present application use terms such as "first" and "second" to distinguish between identical or similar items with substantially the same functions and effects. For example, the first threshold value and the second threshold value are merely used to distinguish between different threshold values ​​and do not limit their order. Those skilled in the art will understand that terms such as "first" and "second" do not limit the quantity or execution order, and that terms such as "first" and "second" do not necessarily indicate differences.

[0217] Second, in the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0218] Third, in the embodiments of the present application, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items 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, c can be single or multiple.

[0219] Fourth, in the embodiments of the present application, "when", "if" and "if" all mean that the device will take corresponding actions under certain objective circumstances, which does not limit the time, nor does it require that the device must perform judgment actions when it is implemented, nor does it mean that there are other limitations.

[0220] Fifth, the "simultaneously" in the embodiments of the present application can be understood as at the same time point, or within a period of time, or within the same cycle, and can be understood specifically in conjunction with the context.

[0221] Sixth, in each embodiment of the present application, "A corresponds to B" means that B is associated with A. "Executing B according to A" does not mean executing B only according to A, but B can also be executed according to A and / or other information.

[0222] Seventh, "predefinition" or "preconfiguration" can be achieved by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in a device (for example, including a terminal device and a network device). This application does not limit its specific implementation method. Among them, "saving" can mean saving in one or more memories. One or more memories can be set separately or integrated in an encoder or decoder, a processor, or a communication device. One or more memories can also be partially set separately and partially integrated in a decoder, a processor, or a communication device. The type of memory can be any form of storage medium, which is not limited by this application.

[0223] The predefined in this application may be understood as defined, predefined, stored, pre-stored, pre-negotiated, pre-configured, solidified, or pre-burned.

[0224] Eighth, in the embodiment of the present application, "used for indication" may include direct indication and indirect indication, and may also include explicit indication and implicit indication. The information indicated by a certain information is called 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, the information to be indicated can be directly indicated, such as the information to be indicated itself or the index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, wherein the other information and the information to be indicated have an association relationship. It is also possible to indicate only a part of the information to be indicated, while the other parts of the information to be indicated are known or agreed in advance. For example, it is also possible to use a pre-agreement (such as a protocol provision) on whether a certain information element exists to implement the indication of the information to be indicated, thereby reducing the indication overhead to a certain extent.

[0225] Ninth, the following describes various embodiments in detail with reference to various flowcharts. However, it should be understood that these flowcharts and the descriptions of the corresponding embodiments are provided for ease of understanding 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 order in which the steps are executed is not fixed and is not limited to that shown in the figures. The order in which the steps are executed should be determined by their functions and inherent logic.

[0226] The LTM in the related art is triggered by a network device and switches immediately, which has the problem of poor switching robustness. Therefore, a switching method with better switching robustness is urgently needed.

[0227] In this regard, an embodiment of the present application provides a cell handover method, the main inventive ideas of which are as follows:

[0228] In order to solve the problem of poor switching robustness of LTM, the embodiment of the present application takes into account that the conditional switching CHO method has the ability to allow the terminal device to independently decide whether to switch. Therefore, on the basis of LTM, the conditional switching CHO method is introduced to allow the terminal device to independently decide whether to switch, forming a conditional LTM to improve the switching robustness. Specifically, the original cell network device uses the switching configuration information to configure the candidate cell to perform conditional LTM cell switching when the execution conditions are met, so that when the terminal device evaluates the candidate cell that meets the execution conditions, it can use the beam of the candidate cell that meets the execution conditions to access the target cell, rather than being triggered by the network device and switching immediately, thereby improving the switching robustness.

[0229] The method provided in the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0230] It should be understood that the following description is only for ease of understanding and explanation, and the method provided in the embodiment of the present application is described in detail using the interaction between a terminal device and a network device as an example. However, this does not constitute any limitation on the execution subject of the method provided in the present application. For example, the terminal device shown in the embodiment below can be replaced by a component (such as a chip or circuit) configured in the terminal device. The network device shown in the embodiment below can also be replaced by a component (such as a chip or circuit) configured in the network device.

[0231] The embodiments shown below do not particularly limit the specific structure of the execution subject of the method provided in the embodiments of the present application. As long as it is possible to communicate according to the method provided in the embodiments of the present application by running a program that records the code of the method provided in the embodiments of the present application, for example, the execution subject of the method provided in the embodiments of the present application can be a terminal device or a network device, or a functional module in the terminal device or the network device that can call and execute the program.

[0232] FIG4 is a schematic flow chart illustrating a cell switching method 400 provided in an embodiment of the present application from the perspective of device interaction. As shown in FIG4 , the cell switching method 400 includes:

[0233] S410: The original cell network device sends conditional layer 1 / 2 triggered mobility LTM handover configuration information to the terminal device.

[0234] It should be understood that the specific forms of the original cell network equipment and terminal equipment can refer to the above-mentioned relevant descriptions and will not be repeated here.

[0235] The switching configuration information is described in detail below.

[0236] The handover configuration information is used to configure the candidate cell to perform conditional LTM cell handover when the execution condition is met.

[0237] Therefore, the conditional LTM cell switching configured in the switching configuration information is a cell switching strategy adopted by the terminal device when it evaluates a candidate cell that meets the execution conditions.

[0238] It should be understood that the above execution conditions are the basis for the terminal device to evaluate whether the candidate cell can be used as the target cell, and for the configuration of the execution conditions, each candidate cell can be configured with one or more, and the embodiments of the present application do not specifically limit this. The candidate cell can be referred to as the LTM candidate cell, and the target cell can be referred to as the LTM target cell.

[0239] It should also be understood that this conditional LTM differs from the decision-making device in related art LTMs. In this approach, the terminal device evaluates candidate cells to determine a target cell from among the candidate cells and then performs a cell handover. Specifically, this conditional LTM differs from related art LTMs in that the original cell network device no longer determines and indicates the target cell to the terminal device. Instead, the terminal device evaluates and determines whether to perform a cell handover and proactively selects the target cell.

[0240] It should be noted that there are one or more candidate cells, and the execution conditions adopted by different candidate cells may be the same or different, and this application does not limit this.

[0241] 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 this.

[0242] The transmission method of the switching configuration information is not limited in this embodiment.

[0243] In one example, the handover configuration information may be carried in radio resource control (RRC) reconfiguration information.

[0244] Specifically, when the measurement information of the candidate cell is sent to the terminal device via the RRC reconfiguration message, it can be sent to the terminal device together with the handover configuration information. In this case, the handover configuration information can be a predefined field in the RRC reconfiguration message. Therefore, when the terminal device obtains the measurement information of the candidate cell via the RRC reconfiguration message, it can also obtain the handover configuration information via the RRC reconfiguration message, effectively avoiding the waste of communication resources.

[0245] In another example, the handover configuration information can be carried in dedicated signaling. Specifically, in embodiments of the present application, the handover configuration information can be sent to the terminal device as an independent signaling message via the original cell network equipment, and sent to the terminal device simultaneously with the RRC reconfiguration message, thereby improving the parsing speed of the handover configuration information. The "simultaneous transmission" can refer to a specific time point or a specific time period, which is not limited in this application.

[0246] 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.

[0247] Specifically, the terminal device receives the conditional LTM handover configuration information sent by the original cell network equipment and evaluates candidate cells based on the execution conditions. After evaluating a candidate cell that meets 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.

[0248] Therefore, the original cell network equipment configures the candidate cell through switching configuration information to perform conditional LTM cell switching when the execution conditions are met. When the terminal device evaluates the candidate cell that meets the execution conditions, it can use the beam of the candidate cell that meets the execution conditions to access the target cell, instead of being triggered by the network device and switching immediately, thereby improving the switching robustness.

[0249] It should be understood that the handover configuration information may include execution condition information for each candidate cell and LTM configuration information for the condition. Different execution condition information corresponds to different execution conditions, and the candidate cells determined to meet the execution conditions are also different. Furthermore, the original cell network equipment may configure corresponding execution condition information for each candidate cell, or may configure unified execution condition information for all candidate cells. This is not specifically limited in the embodiments of the present application.

[0250] Therefore, the following will focus on the execution condition information. The execution condition information includes at least one of the following information:

[0251] (1) The first condition LTM executes the event.

[0252] (2) The second condition LTM executes the condition information.

[0253] That is, the execution condition information may be a first-condition LTM execution event, the execution condition information may be second-condition LTM execution condition information, or the execution condition information may be a first-condition LTM execution event and second-condition LTM execution condition information. It should be understood that the execution condition information may also include other information in addition to the first-condition LTM execution event and second-condition LTM execution condition information, and the present embodiment does not specifically limit the content of the execution condition information.

[0254] 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 the beam-corresponding measurement quality of the original cell. The second conditional LTM execution condition information can be understood as information required to form the second conditional LTM execution condition, which 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 condition is different from the first conditional LTM execution event.

[0255] It should be understood that the first-condition LTM execution event and / or the second-condition LTM execution condition information described above may constitute execution condition information corresponding to each candidate cell, with different execution condition information representing different execution conditions. It should also be understood that a candidate cell may correspond to one or more execution conditions, and that different candidate cells may correspond to the same or different execution condition information, which is not limited in this embodiment.

[0256] It should also be understood that the specific form of the first-condition LTM execution event can be any form representing "an event in which the beam-corresponding measurement quality of the candidate cell is higher than the beam-corresponding measurement quality of the original cell," such as a number, a field, or other form, and this application is not limited thereto. Similarly, the specific form of the second-condition LTM execution condition information can be any form representing "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," such as a number, a field, or other form, and this application is not limited thereto.

[0257] The LTM configuration information for the above conditions includes: the duration of attempting to access the target cell through the selected beam.

[0258] It should be understood that the conditional LTM configuration information can be understood as configuration information for implementing conditional LTM cell switching. In addition, the duration of attempting to access the target cell through the selected beam is less than the corresponding timing duration of the timeout timer T304.

[0259] It should also be understood that, according to 3GPP specifications, the initial value of the timing duration corresponding to timeout timer T304 is 6 seconds, and this value of 6 seconds 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 timeout timer T304 is modified and configured. The timing duration of the attempted access to the target cell controls the time of the access operation in "accessing the target cell using the beam of the candidate cell that meets the execution conditions." If access to the target cell is not successful within the timing duration of the attempted access to the target cell, beam reselection can be initiated in a timely manner, 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 operations corresponding to the same beam, thereby improving the success rate and efficiency of cell handover.

[0260] It should be noted that the specific representation of the duration of attempting to access the target cell through the selected beam can be any form that represents the duration of attempting to access the target cell through the selected beam, such as a number, a field, or other form, and this application does not limit this. For example, its specific representation is the field "Try-Timer" or "Txxx", which is not specifically limited in the embodiments of this application.

[0261] It should also be understood that conditional LTM configuration information can be configured together with execution condition information corresponding to each candidate cell. That is, for conditional LTM cell handover, the original cell network equipment will configure the candidate cell configuration information and conditional LTM configuration information. The conditional LTM configuration information may include the duration of the attempt to access the target cell via the selected beam, and the candidate cell configuration information may include execution condition information corresponding to each candidate cell and measurement information for each candidate cell. This combined configuration can reduce signaling overhead.

[0262] The following describes each item in the execution condition information in detail:

[0263] As mentioned above, the first conditional LTM execution event is the event that the beam-corresponding measurement quality of the candidate cell is higher than the beam-corresponding measurement quality of the original cell, and the beam-corresponding measurement quality of the above two cells can include any 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 of the following:

[0264] (11) The average of the measurement qualities 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.

[0265] (12) The measurement quality corresponding to any beam of the candidate cell is greater than or equal to the measurement quality corresponding to any beam of the original cell.

[0266] (13) The candidate cell has at least one beam whose corresponding measurement quality is greater than or equal to the measurement quality of any beam of the original cell.

[0267] (14) The candidate cell has at least one beam with a corresponding measurement quality greater than or equal to the measurement quality of at least one beam of the original cell.

[0268] (15) The average of the measurement qualities corresponding to the N better beams of the candidate cell is greater than or equal to the measurement qualities corresponding to the N better beams of the original cell, where N is an integer greater than 1.

[0269] In other words, each of the above conditional LTM execution events can be understood as its own corresponding execution condition, and different execution conditions correspond to different execution standards.

[0270] Among them, in the conditional LTM execution event (11), "any beam of the original cell" can be understood as each beam in the original cell, so the conditional LTM execution event (11) is: the average 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 each beam in the original cell. It should be understood that the beams of the candidate cell can be sorted in order from high to low or from low to high according to the measurement quality values. Taking the beams of the candidate cell sorted in order from high to low according to the measurement quality values ​​as an example, the "N better beams of the candidate cell" are explained as follows: the N better beams of the candidate cell can be the top N beams selected from the first position among all the beams of the candidate cell, or the top N beams selected from the second position after the first position. It should be noted that the N beams can be arranged in a continuous manner, an intermittent manner, or other arrangements, etc. The embodiment of the present application does not specifically limit the position and arrangement of the N beams. It should be understood that the embodiment of the present application does not specifically limit the value of N. For example, N is equal to 2 or 3. It should also be understood that the mean can be an arithmetic mean or a weighted mean. Therefore, the embodiment of the present application does not specifically limit the type of mean.

[0271] In the LTM execution event for condition (12), "any beam of the candidate cell" can be understood as every beam in the candidate cell. Therefore, the LTM execution event for condition (12) is: every beam in the candidate cell must be greater than or equal to the measurement quality of every beam in the original cell. Therefore, compared with the execution condition corresponding to item (11) above, the execution standard for the execution condition corresponding to item (12) is higher.

[0272] In the LTM execution event for condition (13), "at least one" can be understood as one or more, and any beam of the original cell can be understood as every beam in the original cell. Therefore, the LTM execution event for condition (13) is: the candidate cell has one or more beams with a measurement quality greater than or equal to the measurement quality of every beam of the original cell. Therefore, compared with the execution condition corresponding to item (12) above, the execution standard for the execution condition corresponding to item (13) is lower.

[0273] In the LTM execution event for condition (14), "at least one" can also be understood as one or more. Therefore, the LTM execution event for condition (14) is: the candidate cell has one or more beams with measurement quality greater than or equal to the measurement quality of one or more beams of the original cell. Therefore, compared with the execution condition corresponding to item (13) above, the execution standard for the execution condition corresponding to item (14) is lower.

[0274] In the conditional LTM execution event (15), since N is an integer greater than 1, the conditional LTM execution event (15) is: the average of the measurement qualities corresponding to the N better beams of the candidate cell is greater than or equal to the measurement qualities corresponding to the multiple better beams in the original cell. It should be understood that the description of "N better beams of the original cell" is similar to the description of "N better beams of the candidate cell" above, that is, the beams of the original cell can be sorted from high to low or from low to high according to the measurement quality values. Taking the order of the beams of the original cell according to the measurement quality values ​​from high to low as an example, the "N better beams of the original cell" are explained as follows: the N better beams of the original cell can be the top N beams selected from the first place in the original cell corresponding to the measurement quality, or can be the top N beams selected from the second place after the first place. It should be noted that the N beams can be arranged in a continuous manner, or in an intermittent manner, or in other arrangements, etc. The embodiment of the present application does not specifically limit the position and arrangement of the N beams. It should be understood that the embodiment of the present application does not specifically limit the value of N, for example, N is equal to 2 or 3. It should also be understood that the mean can be an arithmetic mean or a weighted mean. Therefore, the embodiment of the present application does not specifically limit the type of mean.

[0275] It should be noted that the determination method of the "N better beams of the original cell" and the "N better beams of the candidate cell" can be the same or different. For example, the "N better beams of the candidate cell" are the N beams with the highest corresponding measurement quality ranking selected from the first candidate cell, and the "N better beams of the original cell" are also the N beams with the highest corresponding measurement quality selected from the first candidate cell. Alternatively, the "N better beams of the candidate cell" can be the N beams with the highest corresponding measurement quality ranking selected from the first candidate cell, and the "N better 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 method of the better beams of different cells is optional. It should also be understood that the execution standard of the execution condition corresponding to item (15) is higher than the execution condition corresponding to item (14) above, and lower than the execution condition corresponding to item (11) above.

[0276] It should be understood that the specific content of different first-condition LTM execution events varies. Therefore, the embodiments of the present 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 content can provide a corresponding execution condition, thereby enabling the terminal device to effectively evaluate the candidate cell. This improves the selectivity of the execution condition information.

[0277] It should also be understood that, unlike CHO, in the conditional LTM, the execution condition information may be information including a first conditional LTM execution event, and the information of the first conditional LTM execution event may form a beam-level execution condition.

[0278] 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 above corresponding items in order to evaluate the candidate cell based on the execution condition information. Therefore, under the conditional LTM, the beam measurement quality of the candidate cell and the original cell in the above corresponding items can be obtained based on the Channel State Indicator Reference Signal (CSI-RS) measurement, or based on the Synchronization Signal and PBCH block (SSB) measurement. The embodiment of the present application does not specifically limit the method for obtaining the beam measurement quality of the corresponding items of each cell. Among them, the relevant explanations of CSI-RS and SSB can refer to the relevant technology and will not be repeated here.

[0279] It should be noted that the specific forms of expression of the above-mentioned conditional LTM execution events can be any form that represents the corresponding execution conditions, such as numbers, fields or other forms, and this application does not limit this.

[0280] In one example, each conditional LTM execution event can be expressed in two fields: (11) The expression of the conditional LTM execution event is two fields: "Cell1-N-average" and "Cell0-all". The field "Cell1-N-average" represents the average of the measurement qualities corresponding to the N better beams of the candidate cell; the field "Cell0-all" represents the measurement quality corresponding to any beam of the original cell. (12) The expression of the conditional LTM execution event is two fields: "Cell1-all" and "Cell0-all". The field "Cell1-all" represents the measurement quality corresponding to any beam of the candidate cell; the field "Cell0-all" represents the measurement quality corresponding to any beam of the original cell. (13) The expression of the conditional LTM execution event is two fields: "Cell1-At least one" and "Cell0-all". The field "Cell1-At least one" represents that there is at least one beam corresponding to the measurement quality of the candidate cell; the field "Cell0-all" represents the measurement quality corresponding to any beam of the original cell. (14) The LTM execution event of the condition is expressed in two fields: "Cell1-At least one" and "Cell0-At least one". Among them, the field "Cell1-At least one" indicates that there is at least one beam corresponding to the measurement quality of the candidate cell; the field "Cell0-At least one" indicates that there is at least one beam corresponding to the measurement quality of the original cell. (15) The LTM execution event of the condition is expressed in two fields: "Cell1-N-average" and "Cell0-N". Among them, the field "Cell1-N-average" indicates the average of the measurement qualities of the N better beams of the candidate cell; the field "Cell0-N" indicates the measurement qualities of the N better beams of the original cell.

[0281] In another example, when the terminal device pre-stores the definition content of each first conditional LTM execution event, the specific expression form of each conditional LTM execution event is as follows: The expression form of the conditional LTM execution event (11) 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 preferred beams of the candidate cell. The expression form of the conditional LTM execution event (12) can be one field, and the field "condition LTM event12" indicates the type of the first conditional LTM execution event to which it belongs. Similarly, the expression form of the conditional LTM execution event (13) can be one field "condition LTM event13", which indicates the type of the first conditional LTM execution event to which it belongs. The expression form of the conditional LTM execution event (14) can be one field "condition LTM event14", which indicates the type of the first conditional LTM execution event to which it belongs. The conditional LTM execution event (15) can be expressed in three fields. The first field "condition LTM event15" indicates the type of the first conditional LTM execution event to which it belongs, the second field "N1" indicates the number N of the better beams of the candidate cell, and the third field "N0" indicates the number N of the better beams of the original cell.

[0282] It should be understood that the specific manifestations of different conditional LTM execution events can be the same or different, and the embodiments of the present application are not limited to this. Conditional LTM execution events of different manifestations, on the one hand, can enable the original cell network device to evaluate candidate cells when the terminal device pre-stores the definition content of each first conditional LTM execution event, while reducing communication resources; on the other hand, even if the terminal device does not pre-store the definition content of each first conditional LTM execution event, it can still evaluate the candidate cells, thereby improving the universality of conditional LTM.

[0283] As mentioned above, the second condition 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 described below:

[0284] It should be understood that the first threshold value is used to indicate the threshold value of the beam corresponding measurement quality when the candidate cell meets the execution condition, and the first threshold value includes any one of the following:

[0285] (21) The first threshold value is the threshold value at which the measurement qualities of K better beams in the candidate cell are greater than or equal to, where K is an integer greater than or equal to 1.

[0286] (22) The first threshold value is a threshold value that the measurement quality corresponding to any beam in the candidate cell is greater than or equal to.

[0287] (23) The first threshold value is the threshold value at which the average value of the measurement quality corresponding to M better beams in the candidate cell is greater than or equal to, where M is an integer greater than 1.

[0288] It should also be understood that the second threshold value is used to indicate the threshold value of the beam corresponding measurement quality when the original cell meets the execution condition. The second threshold value includes any one of the following:

[0289] (24) The second threshold value is the threshold value at which the measurement qualities of L better beams in the original cell are all less than or equal to, where L is an integer greater than or equal to 1.

[0290] (25) The second threshold value is a threshold value that the measurement quality corresponding to any beam in the original cell is less than or equal to.

[0291] (26) The second threshold value is the threshold value at which the average value of the measurement quality corresponding to the existence of P better beams in the original cell is less than or equal to, where P is an integer greater than 1.

[0292] It should be understood that the first threshold value can be any one of the different threshold values ​​set for the beam-corresponding measurement quality of the candidate cell; the second threshold value can also be any one of the different threshold values ​​set for the beam-corresponding measurement quality of the original cell. Therefore, different combinations of first threshold values ​​and second threshold values ​​can form different execution condition information, and different execution condition information can correspond to different execution conditions.

[0293] 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 different. Therefore, the embodiments of the present application do not specifically limit the specific content of the first threshold value or the second threshold value. That is, the combination of a first threshold value containing any content and a second threshold value containing any content can provide a corresponding execution condition, thereby enabling the terminal device to effectively evaluate the candidate cell. This improves the selectivity of the execution condition information.

[0294] It should also be understood that, unlike CHO, in the conditional LTM, the execution condition information may be information including a first threshold value and a second threshold value, and the first threshold value and the second threshold value may form a beam-level execution condition.

[0295] 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 beam measurement quality of the original cell in the corresponding first threshold value in order to evaluate the candidate cell based on the execution condition information. Therefore, under the 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 measurement, or based on the synchronization signal block SSB measurement. The embodiment of the present application does not specifically limit the method for obtaining the beam measurement quality of each cell. Among them, the relevant explanations of CSI-RS and SSB can refer to the relevant technology and will not be repeated here.

[0296] It should be understood that the first threshold value type of the corresponding item of the candidate cell may 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.

[0297] It should be noted that the specific expression form of each threshold value corresponding to each of the above cells can be any form that represents the corresponding execution conditions, such as numbers, fields or other forms, and this application does not limit this.

[0298] In one example, each first threshold value is specifically expressed in a field: (21) The first threshold value is expressed in a field: "Cell1-K". (22) The first threshold value is expressed in a field: "Cell1-all". (23) The first threshold value is expressed in a field: "Cell1-M-average". Similarly, each second threshold value is specifically expressed in a field: (24) The second threshold value is expressed in a field: "Cell0-K". (25) The second threshold value is expressed in a field: "Cell0-all". (26) The second threshold value is expressed in a field: "Cell0-M-average".

[0299] In another example, when the terminal device pre-stores the definition contents of each first threshold value and each second threshold value, the specific expression form of each first threshold value is a field: (21) The expression form of the first threshold value is a field: "threshold21". (22) The expression form of the first threshold value is a field: "threshold22". (23) The expression form of the first threshold value is a field: "threshold23". Similarly, the specific expression form of each second threshold value is a field: (24) The expression form of the second threshold value is a field: "threshold24". (25) The expression form of the second threshold value is a field: "threshold25". (26) The expression form of the second threshold value is a field: "threshold26".

[0300] In another example, the first threshold value of item (21) is expressed as a field: “L1-RSRP.” The expression forms of other threshold values ​​are similar and will not be repeated here.

[0301] Therefore, the specific forms of expression of different first threshold values ​​can be the same or different, and the specific forms of expression of different second threshold values ​​can be the same or different, and the embodiments of the present application do not limit this. The different forms of expression of the first threshold value and the second threshold value, on the one hand, can enable the original cell network device to evaluate the candidate cell when the terminal device pre-stores the definition content of each first threshold value and the second threshold value, while reducing communication resources; on the other hand, when the terminal device does not pre-store the definition content of each first threshold value and the second threshold value, it can still evaluate the candidate cell, thereby improving the universality of the conditional LTM.

[0302] As mentioned above, the execution condition information can be the first condition LTM execution event and the second condition LTM execution condition information. Therefore, the execution condition information including both the first condition LTM execution event and the second condition LTM execution condition information is described as follows:

[0303] The execution condition information may simultaneously include any one of the conditional LTM execution events (11) to (15), any one of the first threshold values ​​(21) to (23), and any one of the second threshold values ​​(24) to (26). Since both the first conditional LTM execution event and the second execution condition information are optional, the execution condition information including "any one of the conditional LTM execution events (11) to (15), any one of the first threshold values ​​(21) to (23), and any one of the second threshold values ​​(24) to (26)" and the execution condition corresponding to the execution condition information are all optional.

[0304] The above is an explanation of the specific content of the handover configuration information. In addition, as for the transmission mode of the handover configuration information, as mentioned above, it can be carried in the radio resource control RRC reconfiguration information or dedicated signaling, which will not be repeated here.

[0305] It should be noted that execution condition information with different contents corresponds to different execution conditions. Therefore, after the terminal device receives different execution condition information contents, it evaluates candidate cells that meet different execution conditions.

[0306] After the terminal device receives the execution condition information, the candidate cells evaluated as meeting the execution conditions include: candidate cells that meet the first condition, the 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, the LTM execution event, the first threshold, and the second threshold. Therefore, there are three types of candidate cells that meet the execution conditions, and the following describes each type of "candidate cells that meet the execution conditions."

[0307] (1) The following analysis is performed on candidate cells that meet the first condition for LTM execution events:

[0308] 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 including 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 event may include any of the following:

[0309] (31) The candidate cell whose average value of the measurement quality corresponding to the N better beams is greater than or equal to the measurement quality corresponding to any beam of the original cell.

[0310] (32) Candidate cells whose arbitrary beam corresponding measurement quality is greater than or equal to the arbitrary beam corresponding measurement quality of the original cell.

[0311] (33) There is a candidate cell whose corresponding beam measurement quality is greater than or equal to the corresponding beam measurement quality of any beam of the original cell.

[0312] (34) There is a candidate cell whose corresponding beam measurement quality is greater than or equal to the corresponding beam measurement quality of the original cell.

[0313] (35) The candidate cell is one in which the average of the measurement qualities corresponding to the N better beams is greater than or equal to the measurement qualities corresponding to the N better beams of the original cell.

[0314] Therefore, when the execution condition information includes different first condition LTM execution events, the terminal device can evaluate candidate cells that meet different first condition LTM execution events. Thus, candidate cells that meet different first condition LTM execution conditions improve the selectivity of candidate cells.

[0315] (2) The following analysis is performed on candidate cells that meet both the first threshold and the second threshold:

[0316] 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, the execution condition information including 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 threshold value and the second threshold value may include any of the following:

[0317] (41) When there are L better beams in the original cell whose corresponding measurement qualities are all less than or equal to the second threshold value, there are K better beams in the candidate cell whose corresponding measurement qualities are all greater than or equal to the first threshold value.

[0318] (42) When there are L better beams in the original cell whose corresponding measurement qualities are all less than or equal to the second threshold, the candidate cell is any beam whose corresponding measurement quality is greater than or equal to the first threshold.

[0319] (43) When there are L better beams in the original cell whose corresponding measurement qualities are all less than or equal to the second threshold value, there are M candidate cells whose average values ​​of the corresponding measurement qualities of the better beams are greater than or equal to the first threshold value.

[0320] (44) When the measurement quality corresponding to any beam in the original cell is less than or equal to the second threshold value, there are K candidate cells whose corresponding measurement qualities of better beams are all greater than or equal to the first threshold value.

[0321] (45) When the measurement quality corresponding to any beam in the original cell is less than or equal to the second threshold value, the candidate cell whose measurement quality corresponding to any beam is greater than or equal to the first threshold value is selected.

[0322] (46) When the measurement quality corresponding to any beam in the original cell is less than or equal to the second threshold value, there are M candidate cells whose average values ​​of the measurement quality corresponding to better beams are greater than or equal to the first threshold value.

[0323] (47) When there are P better beams in the original cell whose average corresponding measurement quality is less than or equal to the threshold value, there are K better beams in the candidate cell whose corresponding measurement quality is greater than or equal to the first threshold value.

[0324] (48) When there are P better beams in the original cell whose average corresponding measurement quality is less than or equal to the threshold value, the candidate cell whose corresponding measurement quality is greater than or equal to the first threshold value.

[0325] (49) When there are P better beams in the original cell whose average values ​​of the measurement qualities are less than or equal to the threshold value, there are M candidate cells whose average values ​​of the measurement qualities are greater than or equal to the first threshold value.

[0326] 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 meet different second threshold values, and the candidate cells that meet different first threshold values ​​and / or meet different second threshold values ​​improve the selectivity of the candidate cells.

[0327] (3) The following analysis is performed for candidate cells that simultaneously meet the first condition LTM execution event and meet both the first threshold and the second threshold:

[0328] 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 of the first-condition LTM execution events, any one of the first threshold values, and any one of the second threshold values, the execution condition information including 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 candidate cells that meet the first-condition LTM execution event, the first threshold value, and the second threshold value that are evaluated may include any of the following: a candidate cell that simultaneously meets any one of (11) to (15), any one of (21) to (23), and any one of (24) to (26).

[0329] In one example, a candidate cell that simultaneously satisfies (11), (21), and (24) is a candidate cell in which, when there are L better beams in the original cell whose corresponding measurement qualities are all less than or equal to the second threshold value, the average of the corresponding measurement qualities of the N better beams is greater than or equal to the measurement quality of any beam in the original cell, and the corresponding measurement qualities of the K better beams are greater than or equal to the first threshold value. In another example, a candidate cell that simultaneously satisfies (12), (22), and (25) is a candidate cell in which, when the corresponding measurement quality of any beam in the original cell is less than or equal to the second threshold value, the corresponding measurement quality of any beam is greater than or equal to the measurement quality of any beam in the original cell, and the corresponding measurement quality of any beam is greater than or equal to the first threshold value.

[0330] 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 meet different first-condition LTM execution events and different first thresholds and / or different second thresholds. Thus, candidate cells that meet different first-condition LTM execution events and different first thresholds and / or different second thresholds improve the selectivity of candidate cells. Furthermore, different types of candidate cells further improve the selectivity of candidate cells.

[0331] It should be understood that after evaluating the candidate cells that meet the execution conditions, the terminal device can execute the beam determination scheme. Since there are three types of candidate cells that meet the execution conditions, when one type of candidate cell is evaluated, the terminal can execute the corresponding beam determination scheme. That is: when the candidate cells that meet the execution conditions include "candidate cells that meet the first condition LTM execution event", beam determination scheme one is executed; when the candidate cells that meet the execution conditions include "candidate cells that meet the first threshold value and meet the second threshold value", beam determination scheme two is executed; when the candidate cells that meet the execution conditions include "candidate cells that meet the first condition LTM execution event and meet the first threshold value and meet the second threshold value", beam determination scheme three is executed.

[0332] Beam determination scheme 1 is as follows: if there is one beam among the "candidate cells that meet the first condition for LTM execution events," the beam of the candidate cell that meets the execution condition is the beam of the "candidate cell that meets the first condition for LTM execution events." Alternatively, if there are multiple beams among the "candidate cells that meet the first condition for LTM execution events," the beam of the candidate cell that meets the execution condition is any one of the "candidate cells that meet the first condition for LTM execution events," or the beam of the "candidate cell that meets the first condition for LTM execution events" with the highest measurement quality.

[0333] Beam determination scheme 2 is as follows: If the number of beams of "candidate cells that meet both the first and second thresholds" is one, the beam of the candidate cell that meets both the first and second thresholds is selected as the candidate cell that meets the execution criteria. Alternatively, if there are multiple beams of "candidate cells that meet both the first and second thresholds", the beam of the candidate cell that meets the execution criteria is selected as any one of the "candidate cells that meet both the first and second thresholds" or the beam of the "candidate cell that meets both the first and second thresholds" with the higher measurement quality.

[0334] Beam determination scheme three is: if the number of beams of “candidate cells that meet the first condition LTM execution event and meet the first threshold value and meet the second threshold value” is one, then the beam of the candidate cell that meets the execution condition is the beam of the “candidate cell that meets the first condition LTM execution event and meets the first threshold value and meets the second threshold value”; or, if the number of beams of “candidate cells that meet the first condition LTM execution event and meet the first threshold value and meet the second threshold value” is multiple, then the beam of the candidate cell that meets the execution condition is any one of the “candidate cells that meet the first condition LTM execution event and meet the first threshold value and meet the second threshold value” or the beam of the “candidate cell that meets the first condition LTM execution event and meets the first threshold value and meets the second threshold value” with greater measurement quality.

[0335] Therefore, the candidate cell beam that meets the execution condition is: any first beam or a first beam with greater measurement quality. The first beam is the beam of a candidate cell that meets the first condition, the 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, the LTM execution event, the first threshold, and the second threshold.

[0336] 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 switching, thereby improving the universality of the cell switching.

[0337] It should be noted that since there are three types of candidate cells that meet the execution conditions, the terminal device can also implement the corresponding beam determination scheme when evaluating multiple candidate cells. That is, when there are multiple types of candidate cells that meet the execution conditions, beam determination scheme four is implemented.

[0338] Beam determination scheme four is: configure different priorities for different types of candidate cells, and then select candidate cells with high priorities that meet the execution conditions from candidate cells that meet the execution conditions, and then select the beams of candidate cells with high priorities that meet the execution conditions.

[0339] In one example, the priority of "candidate cells that meet the first condition LTM execution event and meet the first threshold value and the second threshold value" is one, the priority of "candidate cells that meet the first threshold value and the second threshold value" is two, and the priority of "candidate cells that meet the first condition LTM execution event" is three, among which priority one is higher than priority two, and priority two is higher than priority three. Under this priority configuration, determine which priorities of candidate cells meet the execution conditions, select candidate cells that meet the execution conditions with high priorities, and then select the beams of candidate cells that meet the execution conditions with high priorities. After selecting "candidate cells that meet the execution conditions with high priorities", the subsequent description of beam determination scheme four is similar to the description of the above three beam determination schemes, and they are all analyses under different conditions of the number of beams, which will not be repeated here.

[0340] 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 switching, thereby improving the universality of the cell switching.

[0341] It should be understood that after the beam determination scheme is used to determine the beam of the "candidate cell that meets the execution conditions", if the number of first beams is multiple, then in S420, the beam of the candidate cell that meets the execution conditions is used to access the target cell to complete the cell handover, including the following steps:

[0342] S4211. When any first beam or a first beam with a higher measurement quality is used to access the target cell, a first timer and a timeout timer T304 are started. The first timer is a timer corresponding to the duration of the attempt to access the target cell through the selected beam.

[0343] It should be understood that the first timer and timeout timer T304 may be hardware of the same or different structures, and this embodiment of the present application does not specifically limit this. The first timer may be started when a beam corresponding to a target TCI state identifier is used to access the target cell, or may be started when a "candidate cell that meets the execution conditions" is evaluated. This embodiment of the present application does not specifically limit the start time.

[0344] S4212: If the target cell is successfully accessed before the first timer times out, the cell handover is completed.

[0345] S4213: If the target cell is not successfully accessed before the first timer times out and T304 has not timed out, another first beam is used to access the target cell and the first timer is restarted until T304 times out or the target cell is successfully accessed.

[0346] In one example, when the terminal device evaluates a "candidate cell that meets the first condition LTM execution event" and the number of beams of the "candidate cell that meets the first condition LTM execution event" is multiple, the terminal device can use the beam with the larger measurement quality among the multiple beams to access the target cell, and start the first timer and the timeout timer T304 when accessing. If the target cell is successfully accessed before the first timer times out, the cell switching is completed. If the target cell is not successfully accessed before the first timer times out and T304 has not timed out, another first beam is used to access the target cell and the first timer is restarted until T304 times out or the target cell is successfully accessed.

[0347] In another example, when the terminal device evaluates a "candidate cell that meets the first threshold value and the second threshold value", and the number of beams of the "candidate cell that meets the first threshold value and the second threshold value" is multiple, the terminal device can use the beam with the larger measurement quality among the multiple beams to access the target cell, and start the first timer and timeout timer T304 when accessing. If the target cell is successfully accessed before the first timer times out, the cell switching is completed. If the target cell is not successfully accessed before the first timer times out and T304 has not timed out, another first beam is used to access the target cell and the first timer is restarted until T304 times out or the target cell is successfully accessed.

[0348] In another example, when the terminal device evaluates "a candidate cell that satisfies the first condition LTM execution event and satisfies the first threshold value and the second threshold value", and the number of beams of the "candidate cell that satisfies the first condition LTM execution event and satisfies the first threshold value and the second threshold value" is multiple, the terminal device can use the beam with the larger measurement quality among the multiple beams to access the target cell, and start the first timer and the timeout timer T304 when accessing. If the target cell is successfully accessed before the first timer times out, the cell switching is completed. If the target cell is not successfully accessed before the first timer times out and T304 has not timed out, another first beam is used to access the target cell and the first timer is restarted until T304 times out or the target cell is successfully accessed.

[0349] It should be understood that the timing duration of the attempt to access the target cell controls the time of the access operation corresponding to "accessing the target cell using any first beam or the first beam with larger measurement quality". If the target cell is not successfully accessed before the first timer expires and T304 has not timed out, it means that the access is not successful within the timing duration of the attempt to access the target cell. The beam reselection can be entered in time, and then the reselected beam can be used to re-access the target cell to avoid the low cell switching efficiency caused by the access operation time corresponding to the same beam being too long, thereby improving the success rate and efficiency of the cell switching.

[0350] It should be noted that, during the process of the terminal device executing the cell switching method, there may be a situation where the original cell network device sends MAC CE signaling. In this case, the MAC CE signaling includes the activated transmission configuration index TCI state identifier corresponding to the candidate cell, and there is a corresponding relationship between the activated transmission configuration index TCI state identifier and the beam. Therefore, after the terminal device evaluates the candidate cell that meets the execution conditions according to the above-mentioned cell switching method, in addition to determining the beam of the candidate cell that meets the execution conditions through the beam determination scheme in the above-mentioned cell switching method, the beam of the candidate cell that meets the execution conditions can also be determined based on MAC CE signaling, thereby improving the selectivity of the beam determination scheme. However, in this case, if two beam determination schemes are adopted at the same time, there may be a situation where the determined beams are inconsistent. In order to avoid the situation where the determined beams are inconsistent due to the simultaneous adoption of two beam determination schemes, the embodiment of the present application sets priorities for different beam determination schemes in this case. For example, the priority of the beam determination scheme based on MAC CE signaling is higher than the beam determination scheme based on the above-mentioned cell switching method. Then, the beam is determined based on the beam determination scheme with a higher priority, and there will be no situation where the determined beams are inconsistent due to the simultaneous use of two beam determination schemes.

[0351] It should be understood that when the priority of the beam determination scheme based on MAC CE signaling is higher than the beam determination scheme based on the above-mentioned cell switching method, in order to make the terminal device and the original cell network device have consistent understanding of the activated transmission configuration index TCI status identifier, thereby improving the success rate of cell switching, the embodiment of the present application can adaptively adjust the above-mentioned cell switching method for the coexistence of two beam determination schemes. For example, retain part of the description, update part of the description, etc. In one example, retaining part of the description can be understood as retaining S410, and updating part of the description can refer to: updating the description of the "candidate cells that meet the execution conditions" and the beam determination scheme. The adjusted cell switching method is analyzed in detail below.

[0352] 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, as shown in Figure 5. The MAC CE signaling includes the activated transmission configuration index TCI state identifier 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, which is used to indicate the activated TCI.

[0353] It should also be understood that when the original cell network device configures a maximum of 8 candidate cells, N is a maximum of 8. Furthermore, the number of N and the number of configured candidate cells may be the same or different. For example, if 8 candidate cells are configured, there are 8 TCI state IDs, i.e., each candidate cell corresponds to a TCI state ID. Alternatively, if 3 candidate cells are configured, there are 7 TCI state IDs, with some candidate cells corresponding to one TCI state ID and some candidate cells corresponding to multiple TCI state IDs.

[0354] In Figure 5, the serving cell identifier (Serving Cell ID) can be the identifier of the original cell. Downlink / uplink (D / U) can represent the link corresponding to the beam of the candidate cell that meets the execution conditions adopted by the terminal device to access the target cell. The MAC signaling in Figure 5 is also configured with an identifier of the bandwidth part of the uplink (UL BWP ID) and an identifier of the bandwidth part of the uplink (DL BWP ID). R in Figure 5 is a reserved field, which can also be used to indicate whether the activation state of the TCI state is activated or deactivated. It should also be understood that each candidate cell can correspond to a P, and P equal to 0 is used to indicate that the beam corresponding to the TCI state ID of the corresponding candidate cell is only used for uplink or downlink communication; P equal to 1 is used to indicate that the beam corresponding to the TCI state ID of the corresponding candidate cell is used for uplink and downlink communication.

[0355] It should be noted that execution condition information with different contents corresponds to different execution conditions. Therefore, after the terminal device receives the switching configuration information and MAC CE signaling including different execution condition information, it evaluates the candidate cells that meet different execution conditions.

[0356] Then, after the terminal device receives the execution condition information and MAC CE signaling, the candidate cells that meet the execution conditions are determined, including: the first candidate cell, the second candidate cell, or the 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 includes the corresponding TCI status identifier in the MAC CE signaling; 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 includes the corresponding TCI status identifier in the MAC CE signaling.

[0357] It should be understood that the explanations of “first conditional LTM execution event”, “first threshold value” and “second threshold value” are as described above and will not be repeated here.

[0358] Therefore, when the terminal device receives MAC CE signaling, there are three types of candidate cells that meet the execution conditions, so the following is an introduction to the various types of "candidate cells that meet the execution conditions".

[0359] (1) The following analysis is performed for the candidate cells that meet the first condition of the LTM execution event and whose MAC CE signaling includes the corresponding TCI status flag:

[0360] 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 including different first-condition LTM execution events corresponds to different candidate cells that meet the execution conditions; therefore, the evaluated "candidate cell that meets the first-condition LTM execution event and includes the corresponding TCI state identifier in the MAC CE signaling" may include any of the following:

[0361] (51) The candidate cell whose average value of the measurement quality corresponding to the N better beams is greater than or equal to the measurement quality corresponding to any beam of the original cell and whose MAC CE signaling includes the corresponding TCI status identifier.

[0362] (52) The candidate cell 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 MAC CE signaling includes the corresponding TCI status identifier.

[0363] (53) There is a candidate cell whose corresponding beam measurement quality is greater than or equal to the measurement quality of any beam of the original cell and the MAC CE signaling includes the corresponding TCI status identifier.

[0364] (54) There is a candidate cell whose corresponding beam measurement quality is greater than or equal to the corresponding beam measurement quality of the original cell and the MAC CE signaling includes the corresponding TCI status identifier.

[0365] (55) The candidate cell whose average value of the measurement quality corresponding to the N better beams is greater than or equal to the measurement quality corresponding to the N better beams of the original cell and whose MAC CE signaling includes the corresponding TCI status identifier.

[0366] Therefore, when a terminal device receives MAC CE signaling, if the execution condition information includes different first-condition LTM execution events, the terminal device can evaluate candidate cells that meet different first-condition LTM execution events and whose MAC CE signaling includes corresponding TCI status identifiers. Thus, candidate cells that meet different first-condition LTM execution conditions and whose MAC CE signaling includes corresponding TCI status identifiers can improve the selectivity of candidate cells.

[0367] (2) The following analysis is performed for the candidate cells that meet the first and second thresholds and include the corresponding TCI status identifier in the MAC CE signaling:

[0368] 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, the execution condition information including different first threshold values ​​and / or different second threshold values ​​corresponds to different candidate cells that meet the execution conditions; therefore, the evaluated "candidate cell that meets the first threshold value and the second threshold value and includes the corresponding TCI state identifier in the MAC CE signaling" may include any of the following:

[0369] (61) When there are L better beams in the original cell whose corresponding measurement qualities are all less than or equal to the second threshold value, there are K better beams whose corresponding measurement qualities are all greater than or equal to the first threshold value and the corresponding TCI status identifiers are included in the MAC CE signaling.

[0370] (62) When there are L better beams in the original cell whose corresponding measurement qualities are all less than or equal to the second threshold, any 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.

[0371] (63) When there are L better beams in the original cell whose corresponding measurement qualities are all less than or equal to the second threshold value, there are M candidate cells whose average corresponding measurement qualities of better beams are greater than or equal to the first threshold value and whose corresponding TCI status identifiers are included in the MAC CE signaling.

[0372] (64) When the measurement quality corresponding to any beam in the original cell is less than or equal to the second threshold value, there are K candidate cells whose corresponding measurement qualities of better beams are greater than or equal to the first threshold value and whose corresponding TCI status identifiers are included in the MAC CE signaling.

[0373] (65) When the measurement quality corresponding to any beam in the original cell is less than or equal to the second threshold value, the candidate cell whose measurement quality corresponding to any beam is greater than or equal to the first threshold value and includes the corresponding TCI status identifier in the MAC CE signaling.

[0374] (66) When the measurement quality corresponding to any beam in the original cell is less than or equal to the second threshold value, there are M candidate cells whose average measurement quality corresponding to better beams is greater than or equal to the first threshold value and whose corresponding TCI status identifier is included in the MAC CE signaling.

[0375] (67) When there are P better beams in the original cell whose average corresponding measurement quality is less than or equal to the threshold value, there are K better beams whose corresponding measurement quality is greater than or equal to the first threshold value and the corresponding TCI status identifier is included in the MAC CE signaling.

[0376] (68) When there are P better beams in the original cell whose average corresponding measurement quality is less than or equal to the threshold value, any candidate cell whose corresponding measurement quality is greater than or equal to the first threshold value and includes the corresponding TCI status identifier in the MAC CE signaling.

[0377] (69) 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 M candidate cells whose average 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.

[0378] Therefore, when the terminal device receives MAC CE signaling, when the execution condition information includes different second condition LTM execution condition information, the terminal device can evaluate the candidate cells that meet different first threshold values ​​and / or meet different second threshold values ​​and include corresponding TCI status identifiers in the MAC CE signaling, and the candidate cells that meet different first threshold values ​​and / or meet different second threshold values ​​and include corresponding TCI status identifiers in the MAC CE signaling can improve the selectivity of candidate cells.

[0379] (3) The following analysis is performed for the candidate cells that meet the first condition LTM execution event, the first threshold value and the second threshold value, and include the corresponding TCI status flag in the MAC CE signaling:

[0380] 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 of the first-condition LTM execution events, any one of the first threshold values, and any one of the second threshold values, the execution condition information including 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 cell that meets the first-condition LTM execution event, the first threshold value, and the second threshold value, and includes a corresponding TCI status indicator in the MAC CE signaling" may include any of the following: a candidate cell that simultaneously meets any one of (11) to (15), any one of (21) to (23), and any one of (24) to (26), and includes a corresponding TCI status indicator in the MAC CE signaling.

[0381] In one example, a candidate cell that simultaneously satisfies (11), (21) and (24) and includes a corresponding TCI status identifier in the MAC CE signaling is: when there are L better beams in the original cell whose corresponding measurement qualities are all less than or equal to the second threshold value, the average of the measurement qualities corresponding to the N better beams is greater than or equal to the measurement quality corresponding to any beam of the original cell and the measurement qualities corresponding to the K better beams are greater than or equal to the first threshold value and the candidate cell includes a corresponding TCI status identifier in the MAC CE signaling.

[0382] In another example, the candidate cell that satisfies (12), (22) and (25) at the same time and includes the corresponding TCI status identifier in the MAC CE signaling is: when the corresponding measurement quality of any beam in the original cell is less than or equal to the second threshold value, the candidate cell whose corresponding measurement quality of any beam is greater than or equal to the measurement quality of any beam in the original cell and the candidate cell whose corresponding measurement quality of any beam is greater than or equal to the first threshold value and includes the corresponding TCI status identifier in the MAC CE signaling.

[0383] 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 meet different first-condition LTM execution events and meet different first threshold values ​​and / or meet different second threshold values, and include corresponding TCI status identifiers in MAC CE signaling. Thus, candidate cells that meet different first-condition LTM execution events and meet different first threshold values ​​and / or meet different second threshold values ​​and include corresponding TCI status identifiers in MAC CE signaling can improve the selectivity of candidate cells. Furthermore, different types of candidate cells further improve the selectivity of candidate cells.

[0384] It should be understood that after evaluating the candidate cell that meets the execution conditions, the terminal device can execute the beam determination scheme. Since the number of target TCI state identifiers in the MAC CE signaling can be one or more, and different numbers of target TCI state identifiers in the MAC CE signaling correspond to different beam determination schemes. Therefore, according to the different numbers of target TCI state identifiers in the MAC CE signaling, it can be divided into the following two cases:

[0385] Case 1: The target TCI state identifier in the MAC CE signaling is one.

[0386] Case 2: There are multiple target TCI status identifiers in the MAC CE signaling.

[0387] For case 1, the beam determination scheme is described as follows:

[0388] It should be understood that the target TCI state identifier is the TCI state identifier corresponding to the first candidate cell, or the target TCI state identifier is the TCI state identifier corresponding to the second candidate cell, or the target TCI state identifier is the TCI state identifier corresponding to the third candidate cell.

[0389] It should also be understood that the corresponding beam determination scheme under Case 1 is: the beam of the candidate cell that meets the execution conditions is the beam corresponding to the target TCI state identifier included in the MAC CE signaling.

[0390] In other words, when the target TCI state identifier in the MAC CE signaling is one, 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 state identifier included in the MAC CE signaling.

[0391] Specifically, when there is a TCI state identifier corresponding to a candidate cell in the MAC CE signaling, the specific situation of case 1 and the corresponding beam determination scheme include:

[0392] If situation 1 is that there is a TCI status identifier corresponding to the first candidate cell in the MAC CE signaling, and the number of the 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 corresponding to the first candidate cell.

[0393] Alternatively, if situation 1 is that there is a TCI status identifier corresponding to the second candidate cell in the MAC CE signaling, and the number of the 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 corresponding to the second candidate cell.

[0394] Alternatively, if situation 1 is that there is a TCI status identifier corresponding to the third candidate cell in the MAC CE signaling, and the number of the 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 corresponding to the third candidate cell.

[0395] Therefore, in case 1, the terminal device can determine the beam of the "candidate cell that meets the execution conditions" when different execution condition information corresponds to the same or different types of "candidate cells that meet 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 inconsistency problem caused by the simultaneous use of different beam determination schemes, such as "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".

[0396] It should be noted that, in order to improve the success rate of cell handover, for the candidate cell whose corresponding TCI status identifier in the MAC CE signaling is one, the original cell network device further includes the following steps:

[0397] S430: Send the TCI status identifier corresponding to the MAC CE signaling to the candidate cell network device.

[0398] It should be understood that the candidate cell includes the first candidate cell or the second candidate cell or the third candidate cell. The first candidate cell is a candidate cell that meets 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 meets 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 meets the first condition LTM execution event and meets the first threshold value and the second threshold value and includes the corresponding TCI status identifier in the MAC CE signaling.

[0399] Specifically, when the candidate cells include one type of candidate cells, the original cell network device may 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 may 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 may send the TCI status identifier corresponding to the third candidate cell in the MAC CE signaling to the third candidate cell network device.

[0400] Therefore, the original cell network device sends a MAC CE signaling "including the activated transmission configuration index TCI status identifier corresponding to the candidate cell" to the terminal device, and also sends the TCI status identifier corresponding to the candidate cell network device in the MAC CE signaling to all candidate cell network devices. This allows all candidate cell network devices that may become target cells to know in advance the beam corresponding to the TCI status identifier in the cell that the terminal device may use, thereby improving the cell success rate.

[0401] It should be noted that the candidate cells may include one or more types of candidate cells. When the candidate cells include multiple types of candidate cells, the original cell network device may send corresponding TCI status identifiers to all types of candidate cell network devices, thereby improving the efficiency of cell switching in subsequent cell reselection.

[0402] As another implementation method, when the candidate cells may include multiple types of candidate cells, the original cell network equipment can also only send 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 equipment, thereby reducing communication resources.

[0403] For case 2, the beam determination scheme is explained as follows:

[0404] It should be understood that the interpretation of "target TCI state identifier" in Case 2 is the same as the description of "target TCI state identifier" in Case 1, that is: the target TCI state identifier is the TCI state identifier corresponding to the first candidate cell, or the target TCI state identifier is the TCI state identifier corresponding to the second candidate cell, or the target TCI state identifier is the TCI state identifier corresponding to the third candidate cell.

[0405] It should also be understood that the corresponding beam determination scheme under situation 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 one of the target TCI status identifiers included in the MAC CE signaling successfully accesses the beam corresponding to the target cell before the duration of the attempt to access the target cell through the selected beam expires.

[0406] Among them, the above-mentioned 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, the embodiment of the present application does not make any specific limitation on the predefined rule. Therefore, 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 embodiment of the present application does not make any specific limitation on the specific position of the preset position. The above-mentioned "the beam corresponding to any target TCI status identifier successfully accesses the beam corresponding to the target cell before the duration of the attempt to access the target cell through the selected beam expires" is different from "the beam corresponding to any target TCI status identifier" because the latter also includes: "the beam corresponding to the target cell has not been successfully accessed after the duration of access to the target cell has expired." In other words, when there are multiple target TCI state identifiers in the MAC CE signaling, the corresponding beam determination scheme is: the beam of the candidate cell that meets the execution conditions is a third beam, and the third beam is one of the following beams: the beam corresponding to the first target TCI state identifier included in the MAC CE signaling, or the beam corresponding to the second target TCI state identifier included in the MAC CE signaling. The first target TCI state identifier is a target TCI state identifier arranged in a preset position, the second target TCI state identifier is any target TCI state identifier, and the beam corresponding to the second target TCI state identifier is the beam corresponding to the target cell that successfully accesses the target cell using the beam corresponding to the second target TCI state identifier before the duration of the attempt to access the target cell through the selected beam expires.

[0407] Specifically, when there is a TCI state identifier corresponding to a candidate cell in the MAC CE signaling, the specific situation of Case 2 and the corresponding beam determination scheme include:

[0408] If situation 2 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 multiple, 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 corresponding to the first candidate cell" included in the MAC CE signaling and arranged in the preset position, or the beam corresponding to any one of the "TCI status identifiers corresponding to the first candidate cell" included in the MAC CE signaling successfully accesses the beam corresponding to the target cell before the duration of the attempt to access the target cell through the selected beam times out.

[0409] Alternatively, if situation 2 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 multiple, 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 corresponding to the second candidate cell" included in the MAC CE signaling and arranged at a preset position, or the beam corresponding to any one of the "TCI status identifiers corresponding to the second candidate cell" included in the MAC CE signaling successfully accesses the beam corresponding to the target cell before the duration of the attempt to access the target cell through the selected beam expires.

[0410] Alternatively, if situation 2 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 multiple, 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 corresponding to the third candidate cell" included in the MAC CE signaling and arranged in the preset position, or the beam corresponding to any one of the "TCI status identifiers corresponding to the third candidate cell" included in the MAC CE signaling successfully accesses the beam corresponding to the target cell before the duration of the attempt to access the target cell through the selected beam expires.

[0411] Therefore, in situation 2, the terminal device can determine the beam of the "candidate cell that meets the execution conditions" when different execution condition information corresponds to the same or different types of "candidate cells that meet 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 inconsistency problem caused by the simultaneous use of different beam determination schemes, such as "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".

[0412] It should be understood that when the third beam is the beam corresponding to the second target TCI state identifier included in the MAC CE signaling, the example of this application describes the specific steps of “accessing the target cell using the beam of the candidate cell that meets the execution conditions to complete the cell handover” in S420 as follows:

[0413] S4221. When accessing the target cell using a beam corresponding to a target TCI status identifier, start the first timer and the timeout timer T304. The first timer is a timer corresponding to the duration of attempting to access the target cell through the selected beam.

[0414] S4222: If the target cell is successfully accessed before the first timer times out, the cell handover is completed.

[0415] S4223. If the target cell is not successfully accessed before the first timer expires and T304 has not timed out, use the beam corresponding to another target TCI state identifier to access the target cell and restart the first timer until T304 times out or the target cell is successfully accessed.

[0416] It should be understood that the first timer and timeout timer T304 may be hardware of the same or different structures, and this embodiment of the present application does not specifically limit this. The first timer may be started when a beam corresponding to a target TCI state identifier is used to access the target cell, or may be started when a "candidate cell that meets the execution conditions" is evaluated. This embodiment of the present application does not specifically limit the start time.

[0417] It should also be understood that another target TCI state identifier can be: the beam corresponding to any other target TCI state identifier of the same candidate cell, or it can be the beam corresponding to another target TCI state identifier adjacent to the target TCI state identifier used for access failure. Therefore, the embodiment of the present application does not make specific limitations on the beam reselection scheme.

[0418] It should also be understood that the timing duration of the attempt to access the target cell controls the time of the access operation corresponding to "accessing the target cell using a beam corresponding to a target TCI status identifier". If the target cell is not successfully accessed before the first timer expires and T304 has not timed out, it means that the access is not successful within the timing duration of the attempt to access the target cell. The beam reselection can be entered in time, and then the reselected beam can be used to re-access the target cell to avoid the low cell switching efficiency caused by the access operation time corresponding to the same beam being too long, thereby improving the success rate and efficiency of the cell switching.

[0419] It should be noted that, in case 2, in order to improve the success rate of cell handover, for the candidate cells corresponding to the TCI status identifier in the MAC CE signaling, the method further includes:

[0420] S440. Send a TCI status identifier arranged at a preset position among 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, where the indication information is used to indicate that the TCI status identifier arranged at the preset position is determined from multiple corresponding TCI status identifiers.

[0421] Specifically, if the candidate cells corresponding to the TCI status identifier in the MAC CE signaling include one or more of the first candidate cell, the second candidate cell or the third candidate cell, the original cell network device sends the TCI status identifier arranged in the preset position among the multiple corresponding TCI status identifiers 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.

[0422] Among them, the candidate cells include the first candidate cell or the second candidate cell or the third candidate cell, 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 includes the corresponding TCI status identifier in the MAC CE signaling, and 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 includes the corresponding TCI status identifier in the MAC CE signaling.

[0423] It should be understood that "multiple corresponding TCI state identifiers" refer to TCI state identifiers corresponding to the same candidate cell. The explanation of "preset position" is as described above and will not be repeated here.

[0424] It should also be understood that the specific form of the "indication information" can be any form that represents "used to indicate the determination of the TCI status identifier arranged in the preset position from multiple corresponding TCI status identifiers", such as a number or field or other form, and this application is not limited to this. In one example, the multiple corresponding beams are beam 1, beam 2, beam 3 and beam 4. If the indication information is "0010", the indication information indicates that beam 3 corresponding to the TCI status identifier with the preset position at the third position can be used as the beam used by the terminal device to access the target cell when the candidate cell is used as the target cell.

[0425] It should also be understood that the above two methods of sending information to the candidate cell network equipment can enable the candidate cell network equipment to know in advance the beam of the corresponding candidate cell that the terminal device may adopt before the terminal device "adopts the beam of the candidate cell that meets the execution conditions to access the target cell", which can improve the success rate of cell switching.

[0426] It should be noted that there may be multiple TCI status identifiers corresponding to the first candidate cell, the second candidate cell, and the third candidate cell in the MAC CE signaling. The situations include: the TCI status identifier corresponding to each candidate cell is 1, or if the TCI status identifiers corresponding to each candidate cell are multiple, or the TCI status identifiers corresponding to some candidate cells are 1, and the TCI status identifiers corresponding to some candidate cells are multiple.

[0427] Therefore, as another implementation method, in case 1, when the TCI status identifier corresponding to each candidate cell is 1, the corresponding beam determination solution further includes:

[0428] If situation 1 is that there are at least two corresponding TCI status identifiers of 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, and then select the candidate cell with a high 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 a high priority that meets the execution conditions.

[0429] 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. Under this priority configuration, the priority candidate cells that meet the execution conditions are determined, the candidate cells with high priorities that meet the execution conditions are selected, and then the beams of the candidate cells with high priorities that meet the execution conditions are selected. After selecting the "candidate cell with high priority that meets the execution conditions", the beam corresponding to the TCI status identifier corresponding to the "candidate cell with high priority that meets the execution conditions" is determined as the beam of the "candidate cell that meets the execution conditions".

[0430] Therefore, in case 1, the terminal device can determine the beam of the "candidate cell that meets the execution conditions" when different execution condition information corresponds to the same or different types of "candidate cells that meet 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 inconsistency problem caused by the simultaneous use of different beam determination schemes, such as "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".

[0431] Therefore, as another implementation method, in case 2, when there are multiple TCI status identifiers corresponding to each candidate cell, the corresponding beam determination solution also includes:

[0432] If situation 2 is that there are at least two corresponding TCI status identifiers of 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 a high 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 a high priority that meets the execution conditions.

[0433] 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. Under this priority configuration, the priority candidate cells that meet the execution conditions are determined, the candidate cells with high priorities that meet the execution conditions are selected, and then the beams of the candidate cells with high priorities that meet the execution conditions are selected. After selecting the "candidate cell with high priority that meets the execution conditions", the beam corresponding to the TCI status identifier corresponding to the "candidate cell with high priority that meets the execution conditions" is determined as the beam of the "candidate cell that meets the execution conditions".

[0434] Therefore, in situation 2, the terminal device can determine the beam of the "candidate cell that meets the execution conditions" when different execution condition information corresponds to the same or different types of "candidate cells that meet 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 inconsistency problem caused by the simultaneous use of different beam determination schemes, such as "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".

[0435] In another embodiment, when the TCI status identifiers corresponding to some candidate cells are all one, and the TCI status identifiers corresponding to some candidate cells are all multiple, the corresponding beam determination scheme includes:

[0436] Determine a target cell from all candidate cells that meet the execution conditions. If the TCI status identifier corresponding to the target cell is 1, the beam is subsequently determined according to the beam determination scheme corresponding to case 1; if the TCI status identifier corresponding to the target cell is multiple, the beam is subsequently determined according to the beam determination scheme corresponding to case 2.

[0437] Therefore, when there may be multiple corresponding TCI status identifiers for the first candidate cell, the second candidate cell, and the 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 switching efficiency.

[0438] The following describes the cell switching solution in the case where the original cell network device does not send MAC CE signaling and the cell switching solution in the case where the original cell network device sends MAC CE signaling in the form of interaction between the terminal device and the network device.

[0439] As shown in FIG6 , the cell switching method 600 includes the following steps:

[0440] S601. The terminal device sends L1 measurement results to the original cell network device.

[0441] S602: The original cell network device determines an LTM handover according to the execution conditions.

[0442] It should be understood that the interpretation of "conditional LTM switching" is consistent with the interpretation of "conditional LTM cell switching" and will not be repeated here.

[0443] S603: The original cell network device sends a conditional LTM handover request to the candidate cell network device.

[0444] The candidate cells include target cells and potential target cells.

[0445] S604: The candidate cell network device sends a conditional LTM handover request response to the original cell network device.

[0446] S604 enables the original cell network device 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 conceptually the same as a "conditional LTM candidate cell."

[0447] S605. The original cell network device sends RRC reconfiguration information to the terminal device.

[0448] The RRC reconfiguration information, also known as an RRC reconfiguration message, is used to instruct a terminal device to perform uplink and downlink synchronization procedures for a candidate cell. The RRC reconfiguration message includes measurement information and handover configuration information for each candidate cell. The handover configuration information includes execution condition information and conditional LTM configuration information for each candidate cell.

[0449] S606. The terminal device sends an RRC reconfiguration completion message to the original cell network device.

[0450] S607: The terminal device performs a downlink synchronization process for the qualified LTM candidate cell.

[0451] S608. The terminal device performs an uplink synchronization process for the qualified LTM candidate cell.

[0452] S609: Evaluate whether the candidate cells meet the corresponding execution conditions, and when a candidate cell meeting the execution conditions is found, disconnect the network device of the original cell.

[0453] S610: Determine the beam of the candidate cell that meets the execution condition.

[0454] S611. The terminal device executes a random access procedure to complete the conditional LTM switching.

[0455] That is to say, the terminal device uses the beam of the candidate cell that meets the execution conditions to access the target cell to complete the cell switching.

[0456] It should be noted that the specific scheme of cell switching performed in the embodiment of the present application is similar to the specific scheme of cell switching performed when the terminal device does not receive the conditional switching configuration information under LTM, and will not be repeated here.

[0457] It should be understood that inter-cell beam management (ICBM) requires that the terminal device is under the coverage of the original cell, and the transmission reception point (TRP) of the original cell can send information to the terminal device through a non-dedicated channel / signal (for example, broadcast, paging, etc.); the TRP of the candidate cell can transmit dedicated information; it does not support simultaneous data reception or simultaneous data transmission. The MAC entity of the terminal device receives MAC CE signaling from the original cell. In this case, the cell switching method can be executed. As shown in Figure 7, the cell switching method 700 includes the following steps:

[0458] S701. The terminal device sends L1 measurement results to the original cell network device.

[0459] S702: The original cell network device determines an LTM handover according to the execution conditions.

[0460] It should be understood that the interpretation of "conditional LTM switching" is consistent with the interpretation of "conditional LTM cell switching" and will not be repeated here.

[0461] S703: The original cell network device sends a conditional LTM handover request to the candidate cell network device.

[0462] The candidate cells include target cells and potential target cells.

[0463] S704: The candidate cell network device sends a conditional LTM handover request response to the original cell network device.

[0464] S704 enables the original cell network device to obtain conditional LTM candidate cell configuration information, which may include measurement information of each candidate cell.

[0465] S705. The original cell network device sends RRC reconfiguration information to the terminal device.

[0466] The RRC reconfiguration information, also known as an RRC reconfiguration message, is used to instruct a terminal device to perform uplink and downlink synchronization procedures for a candidate cell. The RRC reconfiguration message includes measurement information and handover configuration information for each candidate cell. The handover configuration information includes execution condition information and conditional LTM configuration information for each candidate cell.

[0467] S706. The terminal device sends an RRC reconfiguration completion message to the original cell network device.

[0468] S707. The original cell network device sends a MAC CE signaling to the terminal device. The MAC CE signaling includes the activated TCI state identifier corresponding to the candidate cell.

[0469] It should be understood that the “activated TCI state identifier” is the above-mentioned “activated transmission configuration index TCI state identifier”.

[0470] S708. The original cell network device sends corresponding TCI state activation information to the candidate cell network device.

[0471] Among them, for the candidate cell whose 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.

[0472] It should be understood that for a candidate cell with a corresponding TCI state identifier in the MAC CE signaling being multiple, the "corresponding TCI state activation information" sent by the original cell network device is a TCI state identifier arranged at a preset position among multiple corresponding TCI state identifiers; or it is multiple corresponding TCI state identifiers and indication information, and the indication information is used to indicate the determination of the TCI state identifier arranged at the preset position from multiple corresponding TCI state identifiers.

[0473] It should also be understood that when the terminal device executes the conditional LTM, through the above-mentioned S707 operation and the synchronization of the 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 above-mentioned S708 operation, the embodiment of the present application can enable the candidate cell network device to obtain the corresponding activated TCI state identifier, thereby improving the success rate of cell switching.

[0474] S709. The terminal device performs a downlink synchronization process for the qualified LTM candidate cell.

[0475] S710. The terminal device performs an uplink synchronization process for the qualified LTM candidate cell.

[0476] S711 . Evaluate whether a candidate cell meets a corresponding execution condition, and when a candidate cell that meets the execution condition is found, disconnect the network device of the original cell.

[0477] S712. Determine the beam of the candidate cell that meets the execution conditions.

[0478] S713: The terminal device executes a random access procedure to complete the conditional LTM switching.

[0479] That is to say, the terminal device uses the beam of the candidate cell that meets the execution conditions to access the target cell to complete the cell switching.

[0480] In S701 to S713 above, the original cell network equipment preconfigures measurement information for each candidate cell, as well as execution condition information and LTM configuration information for each candidate cell, for the terminal device. When the terminal device receives the measurement information for each candidate cell, as well as the execution condition information and LTM configuration information for each candidate cell, it begins evaluation. When the terminal device evaluates a candidate cell that meets the corresponding execution conditions and simultaneously receives MAC CE signaling including a TCI state identifier from the original cell network equipment, the terminal device can determine how to use the activated TCI to determine the beam and how to perform the random access process according to S708 to S713 in the above cell handover process.

[0481] For example, when it is evaluated that there are K better beams in a candidate cell, and the corresponding measurement qualities are all greater than or equal to the first threshold value, and at the same time, the MAC CE signaling including the TCI state identifier of the candidate cell sent by the original cell network device is received, the subsequent operation is determined according to the number of TCI state identifiers of the candidate cell.

[0482] Specifically, when the number of TCI state identifiers in the candidate cell is 1, 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 connects to the target cell to complete the cell handover. To improve the success rate of cell handover, the original cell network device also sends TCI state activation information to the corresponding candidate cell when sending MAC CE signaling to the terminal device, which is used to inform the corresponding candidate cell of the TCI state identifier that the terminal device may use.

[0483] When the candidate cell has multiple TCI state identifiers, the terminal device can use predefined rules synchronized in advance with the original cell network equipment to connect the TCI state identifier corresponding to the preset position in the MAC CE signaling to the target cell as the beam of the candidate cell that meets the execution conditions to complete the cell handover. To improve the success rate of cell handover, when the original cell network equipment sends the 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.

[0484] For example, TCI state ID 1 and TCI state ID 2 in Figure 5 belong to the same candidate cell, and the preset position in the predefined rule is the first. To avoid inconsistency between the TCI state ID learned by the candidate cell network device and the TCI state ID corresponding to the beam used by the terminal device during the handover process, the original cell network device notifies the candidate cell network device of TCI state ID 1. According to the predefined rules, when the terminal device uses the candidate cell as the target cell, it also knows that it will use the beam corresponding to TCI state ID 1 to access the target cell.

[0485] When there are multiple TCI state identifiers for the candidate cell, in addition to achieving cell switching through predefined rules, cell switching can also be achieved through the following scheme, namely: the original cell network device informs the corresponding candidate cell network device of the TCI state activation information; when the terminal device performs switching, it first uses a beam associated with a TCI state ID to access the target cell; introduces a "Txxx" shorter than T304, and starts "Txxx" when accessing the switching. If the "Txxx" fails to successfully access the target cell after timeout, and T304 does not timeout, then the terminal device can reselect a beam associated with another TCI state ID to access the target cell.

[0486] It should be noted that the specific scheme of cell switching performed in the embodiment of the present application is similar to the specific scheme of cell switching performed when the terminal device receives MAC CE signaling, and will not be repeated here.

[0487] The method provided in the embodiment of the present application is described in detail above with reference to Figures 4, 6 and 7. The device provided in the embodiment of the present application is described in detail below with reference to Figure 8.

[0488] FIG8 is a schematic block diagram of a cell switching apparatus 8000 provided in an embodiment of the present application. As shown in FIG8 , the cell switching apparatus 8000 may include a processing unit 8010 and a transceiver unit 8020 .

[0489] In one possible design, the cell switching device 8000 can implement the operations corresponding to the terminal device in the above method embodiment. For example, the cell switching device can be a terminal device, or a component configured in the terminal device, such as a chip or circuit.

[0490] The cell switching device 8000 can implement the corresponding operations of the terminal device in the method embodiments shown in Figures 4, 6, and 7. 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, the various units in the cell switching device 8000 and the other operations and / or functions described above are respectively used to implement the corresponding processes in the method embodiment shown in Figure 4.

[0491] Specifically, when the cell switching apparatus 8000 is used to execute the method 400 in FIG. 4 , the transceiver unit 8020 may be configured to receive conditional LTM handover configuration information sent by a network device, where the handover configuration information is configured to configure a candidate cell to perform conditional LTM cell handover when an execution condition is met; and the processing unit 8010 may be configured to, upon evaluating a candidate cell that meets the execution condition, access the target cell using the beam of the candidate cell that meets the execution condition to complete the cell handover. There may be one or more candidate cells.

[0492] In another possible design, the cell switching device 8000 can implement the operations corresponding to the network device in the above method embodiment. For example, the cell switching device can be a network device, or a component configured in the network device, such as a chip or circuit.

[0493] The cell switching apparatus 8000 can implement the corresponding operations of the network device in the method embodiment shown in Figure 4. For example, the transceiver unit 8020 can be used to execute S410 in method 400. Furthermore, the various units in the cell switching apparatus 8000 and the other operations and / or functions described above are respectively for implementing the corresponding processes in the method embodiment shown in Figure 4.

[0494] Specifically, when the cell switching device 8000 is used to execute method 400 in Figure 4, the transceiver unit 8020 can be used to send conditional LTM switching configuration information to the terminal device, and the switching configuration information is used to configure the candidate cell to perform conditional LTM cell switching when the execution conditions are met; the candidate cell is one or more.

[0495] It should be understood that the specific process of each unit executing the above corresponding steps has been described in detail in the above method embodiment, and for the sake of brevity, it will not be repeated here.

[0496] It should also be understood that the division of modules in the embodiments of the present application is illustrative and is merely a logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional modules in the various embodiments of the present application may be integrated into a single processor, or may exist physically separately, or two or more modules may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or software functional modules.

[0497] It should be understood that the cell switching device 8000 may correspond to the terminal device 110 or the original cell network device 120 in the communication system 100 shown in Figure 1. The terminal device 110 may be an example of a terminal device, and the original cell network device 120 may be an example of a network device. The processing unit 8010 in the cell switching device 8000 may correspond to a processor in the terminal device 110 or the original cell network device 120, and the processor in the terminal device 110 or the original cell network device 120 may call instructions stored in the memory to implement the above-mentioned functions, such as network coding and obtaining original packets; the transceiver unit 8020 may correspond to an interface in the terminal device 110 or the original cell network device 120, and may respond to instructions from the processor to implement the above-mentioned functions of receiving and / or sending data.

[0498] Specifically, the transceiver unit 8020 in the cell switching device 8000 can be implemented by a transceiver or a communication interface, for example, it can correspond to the transceiver 9020 in the terminal device 9000 shown in Figure 9 and the RRU 1020 in the network device shown in Figure 10. The processing unit 8010 in the cell switching device 8000 can be implemented by at least one processor, for example, it can correspond to the processor 9010 in the terminal device 9000 shown in Figure 9 and the processor 1060 in the network device shown in Figure 10.

[0499] It should be understood that the specific process of each unit executing the above corresponding steps has been described in detail in the above method embodiment, and for the sake of brevity, it will not be repeated here.

[0500] Figure 9 is a schematic diagram of a possible structure of a terminal device 9000 provided in an embodiment of the present application. The terminal device 9000 can be applied to the system shown in Figure 1 to perform the functions of the terminal device in the above method embodiment. As shown in Figure 9, 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, the transceiver 9020, and the memory 9030 can communicate with each other through an internal connection path to transmit control and / or data signals. The memory 9030 is used to store a computer program, and the processor 9010 is used to call and run the computer program from the memory 9030 to control the transceiver 9020 to send and receive signals. Optionally, the terminal device 9000 may also include an antenna 9040 for transmitting the uplink data or uplink control signaling output by the transceiver 9020 via a wireless signal.

[0501] The processor 9010 and the memory 9030 may be combined to form a cell switching device, and the processor 9010 is configured to execute the program code stored in the memory 9030 to implement the above functions. In a specific implementation, the memory 9030 may also be integrated into the processor 9010 or independent of the processor 9010. The processor 9010 may correspond to the processing unit 8010 in FIG. 8 .

[0502] The transceiver 9020 may correspond to the transceiver unit 8020 in FIG8 . The transceiver 9020 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). The receiver is used to receive signals, and the transmitter is used to transmit signals.

[0503] It should be understood that the terminal device 9000 shown in FIG9 is capable of implementing the various processes related to the terminal device in the method embodiments shown in FIG4 , FIG6 , and FIG7 . The operations and / or functions of the various modules in the terminal device 9000 are respectively for implementing the corresponding processes in the above-mentioned method embodiments. For details, please refer to the description of the above-mentioned method embodiments. To avoid repetition, detailed descriptions are omitted here.

[0504] The processor 9010 can be used to execute the actions implemented within the terminal device described in the previous method embodiments, while the transceiver 9020 can be used to execute the actions of the terminal device sending to or receiving from the network device described in the previous method embodiments. For details, please refer to the description of the previous method embodiments, which will not be repeated here.

[0505] Optionally, the terminal device 9000 may further include a power supply 9050 for providing power to various devices or circuits in the terminal device.

[0506] In addition, in order to make the functions of the terminal device more complete, the terminal device 9000 may also include one or more of an input unit 9060, a display unit 9070, an audio circuit 9080, a camera 9090 and a sensor 9100, and the audio circuit 9080 may also include a speaker 9110, a microphone 9120, etc.

[0507] Figure 10 is a possible structural diagram of a network device provided in an embodiment of the present application, for example, a structural diagram of a base station 1000. The base station 1000 can be applied to the system shown in Figure 10 to perform the functions of the network device in the above method embodiment. As shown in Figure 10, 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 (BBU) (also referred to as distributed units (DU)) 1010. The RRU 1020 may be referred to as a transceiver unit, corresponding to the transceiver unit 8020 in Figure 8. Optionally, the transceiver unit may also be referred to as a transceiver, a transceiver circuit, or a transceiver, etc., and may include at least one antenna 1030 and a radio frequency unit 1040. Optionally, the transceiver unit may include a receiving unit and a transmitting unit, the receiving unit may correspond to a receiver (or a receiver, a receiving circuit), and the transmitting unit may correspond to a transmitter (or a transmitter, a transmitting circuit). The RRU 1020 is primarily responsible for transmitting and receiving RF signals and converting RF signals into baseband signals. For example, it is used to send handover configuration information to terminal devices, which is used to configure a candidate cell for conditional LTM cell handover when execution conditions are met. The BBU 1010 is primarily responsible for baseband processing and base station control. The RRU 1020 and BBU 1010 can be physically located together or separately, i.e., a distributed base station.

[0508] BBU 1010 is the control center of the base station, also known as a processing unit, which may correspond to processing unit 8010 in Figure 8 and is primarily used to perform baseband processing functions such as channel coding, multiplexing, modulation, and spread spectrum. For example, the BBU (processing unit) may be used to control the base station to execute the network device operation procedures in the above-mentioned method embodiments, such as generating the above-mentioned indication information.

[0509] In one example, the BBU 1010 may be composed of one or more single boards, and the multiple single boards may jointly support a wireless access network of a single access standard (such as an LTE network), or may separately support wireless access networks of different access standards (such as an LTE network, a 5G network, or other networks). The BBU 1010 also includes a memory 9050 and a processor 9060. The memory 9050 is used to store necessary instructions and data. The processor 9060 is used to control the base station to perform necessary actions, such as controlling the base station to execute the operation process of the network device in the above method embodiment. The memory 9050 and the processor 9060 can serve one or more single boards. That is, a memory and a processor can be set separately on each single board. Alternatively, multiple single boards may share the same memory and processor. In addition, necessary circuits may also be set on each single board.

[0510] It should be understood that base station 1000 shown in Figure 10 is capable of implementing the various processes involving network devices in the method embodiment shown in Figure 4 . The operations and / or functions of the various modules in base station 1000 are respectively for implementing the corresponding processes in the aforementioned method embodiment. For details, please refer to the description of the aforementioned method embodiment; to avoid repetition, detailed descriptions are omitted here.

[0511] The BBU 1010 can be used to perform the actions implemented within the network device described in the previous method embodiments, while the RRU 1020 can be used to perform the actions described in the previous method embodiments in which the network device sends to or receives from the terminal device. For details, please refer to the description in the previous method embodiments and will not be repeated here.

[0512] It should be understood that the base station 1000 shown in FIG10 is only one possible architecture of a network device and does not constitute any limitation to this application. The method provided in this application is applicable to network devices with other architectures. For example, network devices including a CU, a DU, and an active antenna unit (AAU). This application does not limit the specific architecture of the network device.

[0513] An embodiment of the present application further provides a cell switching device, including a processor and an interface; the processor is configured to execute the method in any of the above method embodiments.

[0514] It should be understood that the cell switching device may be one or more chips. For example, the cell switching device may 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.

[0515] During implementation, each step of the above method can be completed by an integrated logic circuit of the hardware in the processor or by instructions in the form of software. The steps of the method disclosed in conjunction with the embodiments of the present application can be directly embodied as being executed by a hardware processor, or can be executed by a combination of hardware and software modules in the processor. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it will not be described in detail here.

[0516] It should be noted that the processor in the embodiments of the present application can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method embodiment can be completed by an integrated logic circuit of the hardware in the processor or by instructions in the form of software. The above 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 device, a discrete gate or transistor logic device, or a discrete hardware component. The various methods, steps, and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor, or can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium mature in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0517] It is understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM bus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0518] According to the method provided in the embodiments of the present application, the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the computer executes the method of any one of the embodiments shown in Figures 4, 6 and 7.

[0519] According to the method provided in the embodiments of the present application, the present application also provides a chip system, including at least one processor and a communication interface, the communication interface and the at least one processor are interconnected through lines, and the at least one processor is used to run a computer program or instruction so that the computer executes the method of any one of the embodiments shown in Figures 4, 6 and 7.

[0520] According to the method provided in the embodiments of the present application, the present application also provides a computer program product, including a computer program, which, when run, enables the computer to execute the method of any one of the embodiments shown in Figures 4, 6 and 7.

[0521] The network devices in the above-mentioned various apparatus embodiments completely correspond to the network devices or terminal devices in the terminal devices and method embodiments, and the corresponding steps are performed by the corresponding modules or units. For example, the communication unit (transceiver) performs the receiving or sending steps in the method embodiments, and other steps except sending and receiving can be performed by the processing unit (processor). The functions of the specific units can be referred to the corresponding method embodiments. Among them, there can be one or more processors.

[0522] As used in this specification, the terms "component," "module," "system," and the like are used to represent computer-related entities, hardware, firmware, a combination 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. By way of illustration, both an application running on a computing device and a computing device can be a component. One or more components can reside in a process and / or an execution thread, and a component can be located on a computer and / or distributed between two or more computers. In addition, these components can be executed from various computer-readable media having various data structures stored thereon. 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 on a local system, a distributed system, and / or a network, such as the Internet interacting with other systems via signals).

[0523] Those skilled in the art will appreciate that the various illustrative logical blocks and steps described in conjunction with the embodiments disclosed herein can be implemented using 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. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0524] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0525] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0526] Units described as separate components may or may not be physically separate, and 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 these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0527] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0528] In the above embodiments, the functions of each functional unit can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions (programs). When the computer program instructions (program) are loaded and executed on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. Available media may be magnetic media (eg, floppy disks, hard disks, tapes), optical media (eg, high-density digital video discs (DVDs)), or semiconductor media (eg, solid state disks (SSDs)).

[0529] If the function is implemented in the form of 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 the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk, or an optical disk.

[0530] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A cell handover method, characterized in that: include: Receiving conditional layer 1 / 2 triggered mobility LTM handover configuration information, wherein the handover configuration information is used to configure a candidate cell to perform conditional LTM cell handover when an execution condition is met; the candidate cell may 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 switching.

2. The method according to claim 1, characterized in that The handover configuration information includes execution condition information of each candidate cell and conditional LTM configuration information; The execution condition information includes at least one of the following information: The first condition LTM executes the event; Second-condition LTM execution condition information, where the second-condition LTM execution condition information includes a first threshold value and a second threshold value, where the first threshold value is used to indicate a threshold value of beam corresponding measurement quality when the candidate cell meets the execution condition, and the second threshold value is used to indicate a threshold value of beam corresponding measurement quality when the original cell meets the execution condition; The LTM configuration information of the condition includes: the duration of attempting to access the target cell through the selected beam.

3. The method according to claim 2, characterized in that The first condition LTM execution event includes any one of the following: The average of the measurement qualities 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. The measurement quality corresponding to any beam of the candidate cell is greater than or equal to the measurement quality corresponding to any beam of the original cell; The candidate cell has at least one beam with a measurement quality greater than or equal to the measurement quality of any beam of the original cell; The candidate cell has at least one beam with a measurement quality greater than or equal to the measurement quality of at least one beam of the original cell; The average of the measurement qualities corresponding to the N better beams of the candidate cell is greater than or equal to the measurement qualities 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 a threshold value at which the measurement qualities of K better beams in the candidate cell are greater than or equal to, where K is an integer greater than or equal to 1; The first threshold value is a threshold value that the measurement quality corresponding to any beam in the candidate cell is greater than or equal to; The first threshold value is a threshold value at which the average value of the measurement quality corresponding to M better beams in the candidate cell is greater than or equal to, where M is an integer greater than 1.

5. The method according to any one of claims 2 to 4, characterized in that: The second threshold value includes any one of the following: The second threshold value is a threshold value at which the measurement qualities of L better beams in the original cell are all less than or equal to the value, where L is an integer greater than or equal to 1; The second threshold value is a threshold value that the measurement quality corresponding to any beam in the original cell is less than or equal to; The second threshold value is a threshold value at which the average value of the measurement quality corresponding to P better beams in the original cell is less than or equal to, where P is an integer greater than 1.

6. The method according to any one of claims 2 to 5, characterized in that: The duration of the attempt to access the target cell through the selected beam is less than the corresponding timing duration of the timeout timer T304.

7. The method according to any one of claims 2 to 6, characterized in that: The candidate cells that meet the execution conditions include: Candidate cells that meet the first condition for LTM execution events; or, Candidate cells that meet the first threshold and the second threshold; or, The LTM execution event satisfies the first condition and the candidate cells satisfy the first threshold and the second threshold.

8. The method according to any one of claims 2 to 7, characterized in that: The beams of the candidate cells that meet the execution conditions are: Any first beam or a first beam with greater measurement quality; the first beam is a beam of a candidate cell that meets the first condition LTM execution event, or a beam of a candidate cell that meets the first threshold value and the second threshold value, or a beam of a candidate cell that meets the first condition LTM execution event and meets the first threshold value and the second threshold value.

9. The method according to claim 8, characterized in that If there are multiple first beams, accessing the target cell using a beam of a candidate cell that meets the execution condition to complete the cell handover includes: When any first beam or a first beam with a higher measurement quality is used to access the target cell, a first timer and a timeout timer T304 are started, where the first timer is a timer corresponding to the duration of the attempt to access the target cell through the selected beam; If the target cell is successfully accessed before the first timer expires, the cell handover is completed; If the target cell is not successfully accessed before the first timer times out and T304 has not timed out, another first beam is used to access the target cell and the first timer is restarted until T304 times out or the target cell is successfully accessed.

10. The method according to any one of claims 1 to 6, characterized in that The method further comprises: Receive MAC CE signaling, where the MAC CE signaling includes an activated transmission configuration index TCI state identifier corresponding to the candidate cell; when receiving the MAC CE signaling, a candidate cell that meets the execution condition has been evaluated.

11. The method according to claim 10, characterized in that The candidate cells that meet the execution conditions include: A first 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 a corresponding TCI state identifier; or, A second candidate cell; wherein the second candidate cell is a candidate cell that meets the first threshold and the second threshold and includes a corresponding TCI state identifier in the MAC CE signaling; or, The third candidate cell; wherein 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 includes the corresponding TCI state identifier in the MAC CE signaling.

12. The method according to claim 11, characterized in that The target TCI state identifier in the MAC CE signaling is one; the target TCI state identifier is the TCI state identifier corresponding to the first candidate cell, or the target TCI state identifier is the TCI state identifier corresponding to the second candidate cell, or the target TCI state identifier is the TCI state identifier corresponding to the third candidate cell; 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 state identifier included in the MAC CE signaling.

13. The method according to claim 11, characterized in that There are multiple target TCI state identifiers in the MAC CE signaling; the target TCI state identifier is the TCI state identifier corresponding to the first candidate cell, or the target TCI state identifier is the TCI state identifier corresponding to the second candidate cell; or the target TCI state identifier is the TCI state identifier corresponding to the third candidate cell; The beam of the candidate cell that meets the execution condition is a third beam, and the third beam is one of the following beams: The beam corresponding to the first target TCI state identifier included in the MAC CE signaling, where the first target TCI state identifier is the target TCI state identifier arranged at a preset position; or, The beam corresponding to the second target TCI state identifier included in the MAC CE signaling is the beam corresponding to the second target TCI state identifier, which successfully accesses the beam corresponding to the target cell before the duration of the attempt to access the target cell through the selected beam expires.

14. The method according to claim 13, characterized in that If the third beam is the beam corresponding to the second target TCI state identifier included in the MAC CE signaling, accessing the target cell using the beam of the candidate cell that meets the execution conditions to complete the cell handover includes: When a beam corresponding to a target TCI state identifier is used to access the target cell, a first timer and a timeout timer T304 are started. The first timer is a timer corresponding to the duration of the attempt to access the target cell through the selected beam. If the target cell is successfully accessed before the first timer expires, the cell handover is completed; If the target cell is not successfully accessed before the first timer expires and T304 has not timed out, the beam corresponding to another target TCI state identifier is used to access the target cell and the first timer is restarted until T304 times out or the target cell is successfully accessed.

15. The method according to any one of claims 1 to 14, characterized in that The handover configuration information is carried in radio resource control RRC reconfiguration information or dedicated signaling.

16. A cell switching method, characterized in that: include: Sending conditional layer 1 / 2 triggered mobility LTM handover configuration information, the handover configuration information is used to configure the candidate cell to perform conditional LTM cell handover when the execution condition is met; the candidate cell is one or more.

17. The method according to claim 16, characterized in that The handover configuration information includes execution condition information of each candidate cell and conditional LTM configuration information; The execution condition information includes at least one of the following information: The first condition LTM executes the event; Second-condition LTM execution condition information, where the second-condition LTM execution condition information includes a first threshold value and a second threshold value, where the first threshold value is used to indicate a threshold value of beam corresponding measurement quality when the candidate cell meets the execution condition, and the second threshold value is used to indicate a threshold value of beam corresponding measurement quality when the original cell meets the execution condition; The LTM configuration information of the condition includes: the duration of attempting to access the target cell through the selected beam.

18. The method according to claim 17, characterized in that The first condition LTM execution event includes any one of the following: The average of the measurement qualities 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. The measurement quality corresponding to any beam of the candidate cell is greater than or equal to the measurement quality corresponding to any beam of the original cell; The candidate cell has at least one beam with a measurement quality greater than or equal to the measurement quality of any beam of the original cell; The candidate cell has at least one beam with a measurement quality greater than or equal to the measurement quality of at least one beam of the original cell; The average of the measurement qualities corresponding to the N better beams of the candidate cell is greater than or equal to the measurement qualities corresponding to the N better beams of the original cell, where N is an integer greater than 1.

19. The method according to claim 17 or 18, characterized in that The first threshold value includes any one of the following: The first threshold value is a threshold value at which the measurement qualities of K better beams in the candidate cell are greater than or equal to, where K is an integer greater than or equal to 1; The first threshold value is a threshold value that the measurement quality corresponding to any beam in the candidate cell is greater than or equal to; The first threshold value is a threshold value at which the average value of the measurement quality corresponding to M better beams in the candidate cell is greater than or equal to, where M is an integer greater than 1.

20. The method according to any one of claims 17 to 19, characterized in that: The second threshold value includes any one of the following: The second threshold value is a threshold value at which the measurement qualities of L better beams in the original cell are all less than or equal to the value, where L is an integer greater than or equal to 1; The second threshold value is a threshold value that the measurement quality corresponding to any beam in the original cell is less than or equal to; The second threshold value is a threshold value at which the average value of the measurement quality corresponding to P better beams in the original cell is less than or equal to, where P is an integer greater than 1.

21. The method according to any one of claims 17 to 20, characterized in that The duration of the attempt to access the target cell through the selected beam is less than the corresponding timing duration of the timeout timer T304.

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

23. The method according to claim 22, characterized in that For the candidate cell whose corresponding TCI status identifier in the MAC CE signaling is one, the method further includes: Send the corresponding TCI status identifier in the MAC CE signaling to the candidate cell network device, the candidate cell includes the first candidate cell or the second candidate cell or the third candidate cell, 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 includes the corresponding TCI status identifier in the MAC CE signaling, and 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 includes the corresponding TCI status identifier in the MAC CE signaling.

24. The method according to claim 22, characterized in that For a candidate cell having a TCI status identifier corresponding to the MAC CE signaling as multiple, the method further includes: Sending the TCI status identifiers arranged at preset positions among the multiple corresponding TCI status identifiers to the candidate cell network device; Alternatively, a plurality of the corresponding TCI status identifiers and indication information are sent to the candidate cell network device, where the indication information is used to indicate that a TCI status identifier arranged at a preset position is determined from the plurality of corresponding TCI status identifiers; Among them, the candidate cell includes a first candidate cell or 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 the MAC CE signaling includes a 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 a corresponding TCI status identifier, and 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 includes a corresponding TCI status identifier in the MAC CE signaling.

25. The method according to any one of claims 16 to 24, characterized in that The handover configuration information is carried in radio resource control RRC reconfiguration information or dedicated signaling.

26. A terminal device, characterized in that: include: processors, memory, and transceivers; The memory stores computer-executable instructions; the transceiver is used to transmit and receive data; The processor executes the computer-executable instructions stored in the memory, so that the terminal device performs the method according to any one of claims 1 to 15.

27. A network device, characterized in that: include: processors, memory, and transceivers; The memory stores computer-executable instructions; the transceiver is used to transmit and receive data; The processor executes the computer-executable instructions stored in the memory, so that the network device performs the method according to any one of claims 16 to 25.

28. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 25 is implemented.

29. A chip system, characterized in that: The system comprises at least one processor and a communication interface, wherein the communication interface and the at least one processor are interconnected via a line, and the at least one processor is used to run a computer program or instruction to execute the method according to any one of claims 1 to 25.

30. A computer program product, characterized in that The method comprises a computer program which, when being executed, causes a computer to execute the method according to any one of claims 1 to 25.

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