Cell handover method, apparatus, electronic device and storage medium

Abstract

A cell handover method, an apparatus, an electronic device, and a storage medium, relating to the technical field of wireless communications. The method comprises: when receiving RRC information indicating a conditional LTM, a terminal prepares to start transmission of a new uplink transmission within a first time.

Description

Cell handover methods, devices, electronic equipment and storage media

[0001] This disclosure is based on and claims priority to Chinese Patent Application No. 202411998285.2, filed on December 31, 2024, entitled "Fast Cell Handover Method, Apparatus, Electronic Device and Storage Medium", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of wireless communication technology, and in particular to a cell handover method, apparatus, electronic device, and storage medium. Background Technology

[0003] To address the issue of delayed LTM triggering in certain scenarios, leading to reduced handover success rates, 3GPP introduced technologies such as CHO and CPA / C in Release 16. These technologies enable terminals to complete LTM triggering without extensive signaling exchanges, thereby increasing system robustness.

[0004] In related technologies, during the LTM process, after the terminal performs L1 measurement on the beam within the target cell, it needs to report the measurement results to the network and wait for the network to issue a Cell Switch command signaling via MAC CE. In scenarios where the terminal moves quickly or the wireless environment changes rapidly, the optimal handover opportunity may be missed due to the long network waiting time, resulting in a reduced handover success rate. Summary of the Invention

[0005] This disclosure provides a cell handover method, apparatus, electronic device, and storage medium, which at least to some extent overcomes the problem of reduced handover success rate caused by long network waiting times in related technologies, resulting in missed optimal handover opportunities.

[0006] According to one aspect of this disclosure, a cell handover method is provided, comprising: when a terminal receives RRC information of an indication condition LTM, preparing to start a new uplink transmission within a first time period.

[0007] In one embodiment of this disclosure, the step of selecting users belonging to the first user group from the second user group includes: configuring a set of reference signals for measurement, transmitting the reference signals using beams belonging to the same beam group, so that the user terminal measures the reference signals, obtains measurement results, and reports the measurement results, wherein the measurement results include the received power (RSRP) of the reference signal; if the RSRP of the reference signal meets a preset condition, then the user terminal is determined to be a user belonging to the first user group.

[0008] In one embodiment of this disclosure, the first time includes the second and / or third and / or fourth and / or fifth and / or sixth and / or seventh time.

[0009] In one embodiment of this disclosure, the second time is the RRC processing time.

[0010] In one embodiment of this disclosure, the terminal processes RRC signaling containing indication condition LTM during the second time period.

[0011] In one embodiment of this disclosure, the third time is a time uncertainty.

[0012] In one embodiment of this disclosure, the third time is the time period from when the terminal successfully decodes the conditional LTM command to when a condition that can trigger the conditional LTM exists at the measurement reference point.

[0013] In one embodiment of this disclosure, the fourth time is the measurement time.

[0014] In one embodiment of this disclosure, the fourth time is the period from the end of the third time to the terminal performing LTM or handover to the target cell and the start of the fifth time.

[0015] In one embodiment of this disclosure, the fifth time is an interruption time.

[0016] In one embodiment of this disclosure, the fifth time is the period from when the terminal begins executing the conditional LTM to the target cell to when the terminal begins a new uplink transmission.

[0017] In one embodiment of this disclosure, the fifth time includes a first sub-time and / or a second sub-time and / or a third sub-time and / or a fourth sub-time.

[0018] In one embodiment of this disclosure, the first sub-time is the terminal processing time, which includes changes to the target cell parameters and / or L1 or L2.

[0019] In one embodiment of this disclosure, the second sub-time is the time for fine-grained time tracking and / or for acquiring all timing information of the target cell.

[0020] In one embodiment of this disclosure, the third sub-time is the time for SSB processing.

[0021] In one embodiment of this disclosure, the fourth sub-time is the uncertainty of interruption or the uncertainty of sending the first uplink transmission.

[0022] In one embodiment of this disclosure, the sixth time is the terminal execution preparation time for conditional LTM.

[0023] In one embodiment of this disclosure, the sixth time begins when the terminal becomes aware that the conditions of the conditional LTM are met and / or the identifier or ID of the target cell is determined.

[0024] In one embodiment of this disclosure, the seventh time is the conditional LTM early synchronization or processing time.

[0025] In one embodiment of this disclosure, the seventh time includes a fifth sub-time and / or a sixth sub-time.

[0026] In one embodiment of this disclosure, the fifth sub-time is the TCI state activation time of the candidate cell or the target cell.

[0027] In one embodiment of this disclosure, during the fifth sub-time period, the terminal completes the activation of the candidate cell or target cell TCI state.

[0028] In one embodiment of this disclosure, the sixth sub-time is the uplink synchronization time.

[0029] In one embodiment of this disclosure, the terminal completes uplink synchronization with the candidate cell or the target cell during the sixth sub-time period.

[0030] In one embodiment of this disclosure, the terminal receives RRC information indicating a conditional LTM, the information including the configuration of the conditional LTM.

[0031] In one embodiment of this disclosure, the configuration of the conditional LTM includes any one or more of the following:

[0032] Configuration of LTM candidate cells;

[0033] LTM execution conditions.

[0034] In one embodiment of this disclosure, the configuration of the LTM candidate cells includes any one or more of the following:

[0035] LTM configuration: LTM-Config;

[0036] LTM candidate configuration LTM-Candidate;

[0037] LTM's CSI report configuration is LTM-CSI-ReportConfig;

[0038] LTM's CSI resource configuration is LTM-CSI-ResourceConfig;

[0039] Random access preamble for LTM candidate cells.

[0040] In one embodiment of this disclosure, the method further includes:

[0041] When one or more LTM execution conditions are met, the execution condition LTM or conditional LTM is switched, wherein the LTM execution conditions include one or more trigger conditions.

[0042] In one embodiment of this disclosure, the triggering condition includes any one or more of the following:

[0043] The service quality of the service cell or the current cell is lower than the first threshold.

[0044] The service quality of the neighboring cell, candidate cell, or target cell is higher than the service quality of the serving cell, current cell, PCell, or PSCell by the first bias number.

[0045] The service quality of the serving cell, current cell, PCell, or PSCell is lower than the second threshold, while the service quality of the neighboring cell, SCell, candidate cell, or target cell is higher than the third threshold.

[0046] In one embodiment of this disclosure, the method further includes:

[0047] Evaluating whether the LTM execution conditions are met, wherein evaluating the LTM execution conditions includes performing L1 and / or L3 measurements on the serving cell and / or LTM candidate cells.

[0048] In one embodiment of this disclosure, the evaluation reference signal for the LTM execution conditions includes a synchronization signal block (SSB) and / or channel state information reference information (CSI-RS).

[0049] The measured values ​​of the evaluation reference signal include any one or more of the following:

[0050] Reference signal received power RSRP;

[0051] Reference signal reception quality (RSRQ);

[0052] Signal-to-noise ratio (SINR).

[0053] In one embodiment of this disclosure, the method further includes:

[0054] The evaluation reference signal for the LTM execution conditions is the measurement object measured by L1 and / or L3;

[0055] The judgment object in the triggering condition is the L1 and / or L3 measurement results of the evaluation reference signal in the serving cell, current cell, PCell, PSCell, neighboring cell, SCell, candidate cell, or target cell.

[0056] In one embodiment of this disclosure, the execution of conditional LTM or conditional LTM switching includes any one or more of the following:

[0057] Disconnected from the service area;

[0058] Switch to the target cell;

[0059] Apply the configuration of the target cell;

[0060] The target cell is one of the candidate cells.

[0061] In one embodiment of this disclosure, the terminal initiates a new uplink transmission within a first time interval, and the method further includes:

[0062] The terminal sends RRCReconfigurationComplete to the network.

[0063] In one embodiment of this disclosure, the transmission initiating a new uplink transmission by the terminal within a first time includes:

[0064] The terminal performs conditional LTM or conditional LTM handover to switch to the target cell;

[0065] The handover is considered complete when the terminal sends the first uplink transmission to the target cell.

[0066] In one embodiment of this disclosure, the method further includes:

[0067] If the terminal fails to complete uplink synchronization with the candidate cell or the target cell within the seventh sub-time of the sixth time period, the first uplink transmission when the terminal performs conditional LTM or conditional LTM handover is the PRACH sent by the terminal.

[0068] If the terminal completes uplink synchronization with the candidate cell or the target cell within the sixth sub-time period of the seventh time period, the first uplink transmission when the terminal performs conditional LTM or conditional LTM handover is uplink data or uplink signaling.

[0069] According to another aspect of this disclosure, a cell handover apparatus is provided, comprising: a cell handover module, configured to prepare to initiate a new uplink transmission within a first time when a terminal receives RRC information of an indication condition LTM.

[0070] According to another aspect of this disclosure, an electronic device is provided, comprising: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to perform the cell handover method described in any of the preceding claims by executing the executable instructions.

[0071] According to another aspect of this disclosure, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the cell handover method described in any of the preceding claims.

[0072] According to another aspect of this disclosure, a computer program product is provided, the computer program product comprising a computer program or computer instructions, the computer program or computer instructions being loaded and executed by a processor to enable a computer to implement the cell handover method described in any of the preceding claims.

[0073] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0074] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0075] Figure 1 shows a schematic diagram of a cell handover system structure according to an embodiment of the present disclosure.

[0076] Figure 2 shows a flowchart of a cell handover method according to an embodiment of the present disclosure.

[0077] Figure 3 shows a flowchart of receiving information in a cell handover method according to an embodiment of the present disclosure.

[0078] Figure 4 shows a flowchart of performing conditional LTM or conditional LTM handover in a cell handover method according to an embodiment of the present disclosure.

[0079] Figure 5 shows a flowchart of evaluating whether the LTM execution conditions are met in a cell handover method according to an embodiment of this disclosure.

[0080] Figure 6 shows a flowchart of a specific example of a cell handover method according to an embodiment of the present disclosure.

[0081] Figure 7 shows a flowchart of starting a new uplink transmission in a cell handover method according to an embodiment of the present disclosure.

[0082] Figure 8 shows a schematic diagram of a cell handover device according to an embodiment of the present disclosure.

[0083] Figure 9 shows a structural block diagram of a computer device according to an embodiment of the present disclosure. Detailed Implementation

[0084] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0085] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0086] To facilitate understanding, before introducing the embodiments of this disclosure, the following explanations are provided for several terms involved in the embodiments of this disclosure:

[0087] LTM: Layer 1 / 2 Trigger Mobility, a mobility enhancement technique in R18, triggered by Layer 1 measurement, triggered by MAC CE, and a beam-level switching.

[0088] CHO: Conditional Handover, a mobility enhancement technology in R16;

[0089] CPA / C: Conditional PSCell Addition / Change, a mobility enhancement technique in Release 16;

[0090] LTM-Config: LTM configuration;

[0091] LTM-Candidate: LTM candidate configuration;

[0092] LTM-CSI-ReportConfig: LTM's CSI report configuration;

[0093] LTM-CSI-ResourceConfig: CSI resource configuration for LTM;

[0094] RRC: Radio Resource Control;

[0095] SSB: Synchronization Signal and PBCH block;

[0096] CSI-RS: Channel State Information-Reference Signal.

[0097] The specific implementation methods of the embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0098] Figure 1 shows a schematic diagram of an exemplary system architecture that can be applied to an embodiment of the present disclosure for a cell handover system.

[0099] As shown in Figure 1, the system architecture includes terminal device 101, network 102 and network-side device 103; wherein, when the terminal (device) receives the RRC information of the indication condition LTM, it is ready to start a new uplink transmission in the first time.

[0100] Network 102 is a medium used to provide a communication link between terminal device 101 and network-side device 103, and can be a wired network or a wireless network.

[0101] Optionally, the aforementioned wireless or wired networks use standard communication technologies and / or protocols. The network is typically the Internet, but can also be any network, including but not limited to Local Area Networks (LANs), Metropolitan Area Networks (MANs), Wide Area Networks (WANs), mobile, wired or wireless networks, private networks, or any combination of virtual private networks. In some embodiments, technologies and / or formats including Hyper Text Markup Language (HTML), Extensible Markup Language (XML), etc., are used to represent data exchanged over the network. Furthermore, conventional encryption technologies such as Secure Socket Layer (SSL), Transport Layer Security (TLS), Virtual Private Networks (VPNs), and Internet Protocol Security (IPSec) can be used to encrypt all or some links. In other embodiments, custom and / or dedicated data communication technologies can be used to replace or supplement the aforementioned data communication technologies.

[0102] Optionally, the terminal device in this embodiment may also be referred to as UE (User Equipment). In specific implementation, the terminal device may be a mobile phone, tablet personal computer, laptop computer, personal digital assistant (PDA), mobile internet device (MID), wearable device, or vehicle-mounted device, etc. It should be noted that the specific type of terminal device is not limited in the embodiments of the present invention.

[0103] Network-side equipment can be base stations, relays, or access points, etc. Base stations can be 5G and later versions of base stations (e.g., 5G NR NB), or base stations in other communication systems (e.g., eNB base stations). It should be noted that the specific type of network-side equipment is not limited in the embodiments disclosed herein.

[0104] Those skilled in the art will understand that the number of terminals, networks, and network-side devices shown in Figure 1 is merely illustrative, and any number of terminals, networks, and network-side devices can be included according to actual needs. This disclosure does not limit this number.

[0105] Figure 2 shows a flowchart of a cell handover method according to an embodiment of the present disclosure. As shown in Figure 1, the cell handover method provided in this embodiment of the present disclosure includes the following steps:

[0106] S202, when the terminal receives the RRC information indicating the LTM condition, it prepares to start a new uplink transmission within the first time.

[0107] For example, when a terminal receives a signaling instruction from the network and sends uplink information to the target cell within the first time, it is considered to have started a new uplink transmission within the first time.

[0108] In a specific instance, sending uplink information to the target cell in the first instance is the terminal handover to the target cell. For RACH-based handover, the first uplink information is the PRACH sent by the terminal to the network.

[0109] In this application, the execution of LTM no longer needs to wait for network instructions, thereby speeding up the handover process, shortening the handover time, seizing the best handover opportunity, improving the handover success rate, and solving the problem of long network waiting time causing missed optimal handover opportunities and reduced handover success rate.

[0110] In one embodiment of this disclosure, the first time includes the second and / or third and / or fourth and / or fifth and / or sixth and / or seventh time.

[0111] This application limits the time required for the terminal to execute the handover process and breaks it down into several steps.

[0112] In one embodiment of this disclosure, the second time is the RRC processing time.

[0113] In one embodiment of this disclosure, the terminal processes RRC signaling containing indication condition LTM in a second time period.

[0114] In one embodiment of this disclosure, the third time is time uncertainty.

[0115] It should be noted that the third time is a time uncertainty caused by the uncertainty of when the measurement conditions will be met. Since the specific required value cannot be determined for the third time, this uncertainty time needs to be introduced.

[0116] In one embodiment of this disclosure, the third time is the time period from when the terminal successfully decodes the conditional LTM command to when a condition that can trigger the conditional LTM exists at the measurement reference point.

[0117] In one embodiment of this disclosure, the third time is the period from when the terminal successfully decodes the RRC signaling containing the conditional LTM command to when the condition that can trigger the NES-based conditional LTM exists at the 901 measurement reference point.

[0118] In one embodiment of this disclosure, the fourth time is the measurement time.

[0119] In one embodiment of this disclosure, the fourth time is the period from the end of the third time to the terminal performing LTM or handover to the target cell and the start of the fifth time.

[0120] For example, the fourth time mentioned above is the period from the point when the conditions for triggering LTM exist to the moment before the interrupt begins.

[0121] In one embodiment of this disclosure, the fifth time is the interruption time.

[0122] In one embodiment of this disclosure, the fifth time is the time period from when the terminal begins to execute the conditional LTM to the target cell to when the terminal begins a new uplink transmission.

[0123] In one embodiment of this disclosure, the fifth time includes a first sub-time and / or a second sub-time and / or a third sub-time and / or a fourth sub-time.

[0124] In one embodiment of this disclosure, the first sub-time is the terminal processing time, which includes changes to the target cell parameters and / or L1 or L2.

[0125] In one embodiment of this disclosure, the second sub-time is the time for fine-grained time tracking and / or for acquiring all timing information of the target cell.

[0126] In one embodiment of this disclosure, the third sub-time is the time for SSB processing.

[0127] In one embodiment of this disclosure, the fourth sub-time is the uncertainty of interruption or the uncertainty of sending the first uplink transmission.

[0128] Specifically, the fourth sub-time is the uncertainty of the timing of sending PRACH or the first uplink data / signaling.

[0129] For example, the fourth sub-time mentioned above is the interruption time, which is the process of the terminal device disconnecting from the current serving cell and establishing a connection with the target cell. During this time, the terminal cannot transmit data.

[0130] In one embodiment of this disclosure, the sixth time is the terminal execution preparation time for conditional LTM.

[0131] In one embodiment of this disclosure, the sixth time begins when the terminal becomes aware that the conditions of the conditional LTM are met and / or the identifier or ID of the target cell is determined.

[0132] In one embodiment of this disclosure, the seventh time is the early synchronization or processing time of the conditional LTM.

[0133] For example, the seventh time mentioned above is the conditional LTM preprocessing time.

[0134] In one embodiment of this disclosure, the seventh time includes the fifth sub-time and / or the sixth sub-time.

[0135] In one embodiment of this disclosure, the fifth sub-time is the TCI state activation time of the candidate cell or the target cell.

[0136] In one embodiment of this disclosure, the terminal completes the activation of the TCI state of the candidate cell or the target cell during the fifth sub-time period.

[0137] In one embodiment of this disclosure, the sixth sub-time is the uplink synchronization time.

[0138] In one embodiment of this disclosure, the terminal completes uplink synchronization with the candidate cell or the target cell during the sixth sub-time period.

[0139] For example, the seventh time mentioned above is the time for some configuration preparation before executing LTM. Regarding TCI state activation, in traditional L3 handover, the TCI state of the target cell is activated only after the terminal establishes a connection with the target cell. Because LTM handover is beam-based, it needs to be activated in advance. For uplink pre-synchronization, this step is not mandatory. If uplink synchronization is completed here, subsequent handovers will be RACH-less; if uplink synchronization is not performed here, subsequent handovers will be RACH-based.

[0140] In one embodiment of this disclosure, as shown in FIG3, the cell handover method provided in this embodiment can enable the terminal to know the required configuration information in advance through the following steps, so as to respond to network changes more quickly and reduce interruption delays during the handover process:

[0141] S302, the terminal receives RRC information indicating condition LTM, the information including the configuration of condition LTM.

[0142] In one embodiment of this disclosure, the configuration of conditional LTM includes any one or more of the following:

[0143] Configuration of LTM candidate cells;

[0144] LTM execution conditions.

[0145] In one embodiment of this disclosure, the configuration of LTM candidate cells includes any one or more of the following:

[0146] LTM configuration: LTM-Config;

[0147] LTM candidate configuration LTM-Candidate;

[0148] LTM's CSI report configuration is LTM-CSI-ReportConfig;

[0149] LTM's CSI resource configuration is LTM-CSI-ResourceConfig;

[0150] Random access preamble for LTM candidate cells.

[0151] In one embodiment of this disclosure, as shown in FIG4, the cell handover method provided in this embodiment can perform conditional LTM or conditional LTM handover through the following steps. By defining multiple triggering conditions, the response speed can be improved and the flexibility enhanced:

[0152] S402, when one or more LTM execution conditions are met, the execution condition LTM or condition LTM is switched, wherein the LTM execution conditions include one or more trigger conditions.

[0153] In one embodiment of this disclosure, the triggering condition includes any one or more of the following:

[0154] The service quality of the service cell or the current cell is lower than the first threshold.

[0155] The service quality of the neighboring cell, candidate cell, or target cell is higher than the service quality of the serving cell, current cell, PCell, or PSCell by the first bias number.

[0156] The service quality of the serving cell, current cell, PCell, or PSCell is lower than the second threshold, while the service quality of the neighboring cell, SCell, candidate cell, or target cell is higher than the third threshold.

[0157] In one embodiment of this disclosure, as shown in FIG5, the cell handover method provided in this embodiment can evaluate LTM execution conditions through the following steps. By measuring information from different dimensions, it is possible to accurately evaluate whether the LTM execution conditions are met:

[0158] S502, Evaluate whether the LTM execution conditions are met, wherein evaluating the LTM execution conditions includes: performing L1 and / or L3 measurements on the serving cell and / or LTM candidate cells.

[0159] In one embodiment of this disclosure, the evaluation reference signal for LTM execution conditions includes a synchronization signal block (SSB) and / or channel state information reference information (CSI-RS).

[0160] The measured values ​​of the evaluation reference signal include any one or more of the following:

[0161] Reference signal received power RSRP;

[0162] Reference signal reception quality (RSRQ);

[0163] Signal-to-noise ratio (SINR).

[0164] In one embodiment of this disclosure, the evaluation reference signal for the LTM execution condition is the measurement object of L1 and / or L3 measurement; the judgment object in the trigger condition is the L1 and / or L3 measurement result of the evaluation reference signal measurement value in the serving cell, current cell, PCell, PSCell, neighboring cell, SCell, candidate cell, or target cell.

[0165] In one embodiment of this disclosure, performing conditional LTM or switching conditional LTM includes any one or more of the following:

[0166] Disconnected from the service area;

[0167] Switch to the target cell;

[0168] Configure the target cell for the application;

[0169] The target community is one of the candidate communities.

[0170] In one embodiment of this disclosure, as shown in FIG6, the cell handover method provided in this embodiment further includes the following steps in order to enable the LTM execution to proceed without waiting for network instructions, thereby accelerating the handover speed, seizing the optimal handover opportunity, and improving the handover success rate:

[0171] S602, the terminal sends RRCReconfigurationComplete to the network.

[0172] In one embodiment of this disclosure, as shown in FIG7, the cell handover method provided in this embodiment includes the following steps during the transmission in which the terminal starts a new uplink transmission in the first time, enabling the terminal to quickly respond to changes in network conditions, rapidly handover to the target cell, and reduce handover latency:

[0173] S702, the terminal performs conditional LTM or conditional LTM handover to the target cell;

[0174] S704: The handover is considered complete when the terminal sends the first uplink transmission to the target cell.

[0175] In one example of this disclosure, if the terminal fails to complete uplink synchronization with the candidate cell or the target cell within the seventh sub-time of the sixth time period, the first uplink transmission when the terminal performs conditional LTM or conditional LTM handover is a PRACH sent by the terminal; if the terminal completes uplink synchronization with the candidate cell or the target cell within the sixth sub-time of the seventh time period, the first uplink transmission when the terminal performs conditional LTM or conditional LTM handover is uplink data or uplink signaling.

[0176] Based on the same inventive concept, this disclosure also provides a cell handover device, as described in the following embodiments. Since the principle by which this device solves the problem is similar to that of the above-described method embodiments, the implementation of this device embodiment can refer to the implementation of the above-described method embodiments, and repeated details will not be elaborated further.

[0177] Figure 8 shows a schematic diagram of a cell handover device according to an embodiment of the present disclosure. As shown in Figure 8, the device includes: a cell handover module 81, an RRC information receiving module 82, a conditional LTM or conditional LTM handover module 83, and an LTM execution condition evaluation module 84.

[0178] Among them, the cell handover module 81 is used to prepare to start a new uplink transmission as soon as possible when the terminal receives the RRC information of the indication condition LTM.

[0179] In one example of this disclosure, the first time in the cell handover module 81 mentioned above includes the second time and / or the third time and / or the fourth time and / or the fifth time and / or the sixth time and / or the seventh time.

[0180] In one example of this disclosure, the second time in the aforementioned cell handover module 81 is the RRC processing time.

[0181] In one example of this disclosure, the terminal in the aforementioned cell handover module 81 processes RRC signaling containing indication condition LTM in the second time period.

[0182] In one example of this disclosure, the third time in the aforementioned cell handover module 81 is a time uncertainty.

[0183] In one example of this disclosure, the third time in the cell handover module 81 is the time period from when the terminal successfully decodes the conditional LTM command to when a condition that can trigger the conditional LTM exists at the measurement reference point.

[0184] In one example of this disclosure, the fourth time in the aforementioned cell handover module 81 is the measurement time.

[0185] In one example of this disclosure, the fourth time in the cell handover module 81 is the period from the end of the third time to the terminal performing LTM or handover to the target cell and the start of the fifth time.

[0186] In one example of this disclosure, the fifth time in the aforementioned cell handover module 81 is the interruption time.

[0187] In one example of this disclosure, the fifth time in the aforementioned cell handover module 81 is the time period from when the terminal begins executing the conditional LTM for the target cell to when the terminal begins a new uplink transmission.

[0188] In one example of this disclosure, the fifth time in the aforementioned cell handover module 81 includes the first sub-time and / or the second sub-time and / or the third sub-time and / or the fourth sub-time.

[0189] In one example of this disclosure, the first sub-time in the cell handover module 81 is the terminal processing time, which includes changes to the target cell parameters and / or L1 or L2.

[0190] In one example of this disclosure, the second sub-time in the cell handover module 81 is the time for fine-grained time tracking and / or for acquiring all timing information of the target cell.

[0191] In one example of this disclosure, the third sub-time in the aforementioned cell handover module 81 is the time for SSB processing.

[0192] In one example of this disclosure, the fourth sub-time in the aforementioned cell handover module 81 is the interruption uncertainty or the uncertainty of sending the first uplink transmission.

[0193] In one example of this disclosure, the sixth time in the aforementioned cell handover module 81 is the terminal execution preparation time for conditional LTM.

[0194] In one instance of this disclosure, the sixth time in the aforementioned cell handover module 81 begins when the terminal becomes aware that the conditions of the conditional LTM have been met and / or the identifier or ID of the target cell has been determined.

[0195] In one example of this disclosure, the seventh time in the aforementioned cell handover module 81 is the conditional LTM early synchronization or processing time.

[0196] In one example of this disclosure, the seventh time in the aforementioned cell handover module 81 includes the fifth sub-time and / or the sixth sub-time.

[0197] In one example of this disclosure, the fifth sub-time in the cell handover module 81 is the TCI state activation time of the candidate cell or the target cell.

[0198] In one example of this disclosure, the cell handover module 81 is further configured to, during the fifth sub-time period, enable the terminal to activate the TCI state of the candidate cell or the target cell.

[0199] In one example of this disclosure, the sixth sub-time in the aforementioned cell handover module 81 is the uplink synchronization time.

[0200] In one example of this disclosure, the cell handover module 81 is further configured to, during the sixth sub-time period, complete uplink synchronization with the candidate cell or the target cell.

[0201] In one embodiment of this disclosure, the cell handover device further includes an RRC information receiving module 82, used by the terminal to receive RRC information indicating condition LTM, the information including the configuration of condition LTM.

[0202] In one example of this disclosure, the conditional LTM configuration in the aforementioned RRC information receiving module 82 includes any one or more of the following:

[0203] Configuration of LTM candidate cells;

[0204] LTM execution conditions.

[0205] In one example of this disclosure, the configuration of the LTM candidate cells in the RRC information receiving module 82 includes any one or more of the following:

[0206] LTM configuration: LTM-Config;

[0207] LTM candidate configuration LTM-Candidate;

[0208] LTM's CSI report configuration is LTM-CSI-ReportConfig;

[0209] LTM's CSI resource configuration is LTM-CSI-ResourceConfig;

[0210] Random access preamble for LTM candidate cells.

[0211] In one embodiment of this disclosure, the cell handover device further includes a conditional LTM or conditional LTM switching module 83, which is used to perform conditional LTM or conditional LTM switching when one or more LTM execution conditions are met, wherein the LTM execution conditions include one or more trigger conditions.

[0212] In one example of this disclosure, the triggering conditions in the aforementioned execution conditional LTM or conditional LTM switching module 83 include any one or more of the following:

[0213] The service quality of the service cell or the current cell is lower than the first threshold.

[0214] The service quality of the neighboring cell, candidate cell, or target cell is higher than the service quality of the serving cell, current cell, PCell, or PSCell by the first bias number.

[0215] The service quality of the serving cell, current cell, PCell, or PSCell is lower than the second threshold, while the service quality of the neighboring cell, SCell, candidate cell, or target cell is higher than the third threshold.

[0216] In one embodiment of this disclosure, the cell handover apparatus further includes an LTM execution condition evaluation module 84 for evaluating whether the LTM execution conditions are met, wherein evaluating the LTM execution conditions includes performing L1 and / or L3 measurements on the serving cell and / or LTM candidate cells.

[0217] In one example of this disclosure, the evaluation reference signals for the LTM execution conditions in the LTM execution condition evaluation module 84 mentioned above include the Synchronization Signal Block (SSB) and / or Channel State Information Reference Information (CSI-RS).

[0218] The measured values ​​of the evaluation reference signal include any one or more of the following:

[0219] Reference signal received power RSRP;

[0220] Reference signal reception quality (RSRQ);

[0221] Signal-to-noise ratio (SINR).

[0222] In one example of this disclosure, the evaluation reference signal for the LTM execution condition in the LTM execution condition evaluation module 84 is the measurement object of L1 and / or L3 measurement; the judgment object in the trigger condition is the L1 and / or L3 measurement result of the evaluation reference signal measurement value in the serving cell, current cell, PCell, PSCell, neighboring cell, SCell, candidate cell, or target cell.

[0223] In one example of this disclosure, the execution of conditional LTM or conditional LTM switching in the above-mentioned execution conditional LTM or conditional LTM switching module 83 includes any one or more of the following:

[0224] Disconnected from the service area;

[0225] Switch to the target cell;

[0226] Configure the target cell for the application;

[0227] The target community is one of the candidate communities.

[0228] In one example of this disclosure, the cell handover module 81 is further configured to have the terminal send RRCReconfigurationComplete to the network.

[0229] In one example of this disclosure, the cell handover module 81 is further configured to have the terminal perform conditional LTM or conditional LTM handover to the target cell; the handover is considered complete when the terminal sends the first uplink transmission to the target cell.

[0230] In one embodiment of this disclosure, the cell handover module 81 is further configured to: if the terminal fails to complete uplink synchronization with the candidate cell or the target cell within the seventh sub-time of the sixth time period, the first uplink transmission when the terminal performs conditional LTM or conditional LTM handover is a PRACH sent by the terminal; if the terminal completes uplink synchronization with the candidate cell or the target cell within the sixth sub-time of the seventh time period, the first uplink transmission when the terminal performs conditional LTM or conditional LTM handover is uplink data or uplink signaling.

[0231] It should be noted that the cell handover module 81 mentioned above corresponds to S202 in the method embodiment. The examples and application scenarios implemented by the above module and the corresponding steps are the same, but it is not limited to the content disclosed in the above method embodiment. It should be noted that the above module, as part of the device, can be executed in a computer system such as a set of computer-executable instructions.

[0232] This application supports a condition-triggered LTM mechanism through a cell handover method and apparatus. It addresses the issue of delayed handover and reduced handover success rate in certain scenarios (e.g., rapid terminal movement or rapid changes in the wireless environment) encountered by LTM technology in 3GPP R18, thereby increasing system robustness. Simultaneously, by limiting handover time, it further enhances the advantages of LTM's fast handover speed and short interruption time, improving user experience.

[0233] Those skilled in the art will understand that various aspects of this disclosure can be implemented as a system, method, or program product. Therefore, various aspects of this disclosure can be specifically implemented in the following forms: a completely hardware implementation, a completely software implementation (including firmware, microcode, etc.), or a combination of hardware and software aspects, collectively referred to herein as a "circuit," "module," or "system."

[0234] The electronic device 900 according to this embodiment of the present disclosure will now be described with reference to FIG9. The electronic device 900 shown in FIG9 is merely an example and should not be construed as limiting the functionality and scope of the embodiments of the present disclosure.

[0235] As shown in Figure 9, the electronic device 900 is presented in the form of a general-purpose computing device. The components of the electronic device 900 may include, but are not limited to: at least one processing unit 910, at least one storage unit 920, and a bus 930 connecting different system components (including the storage unit 920 and the processing unit 910).

[0236] The storage unit stores program code that can be executed by the processing unit 910, causing the processing unit 910 to perform the steps described in the "Exemplary Methods" section above according to various exemplary embodiments of this disclosure.

[0237] For example, the processing unit 910 can perform the following steps in the above method embodiment: when the terminal receives the RRC information of the indication condition LTM, it prepares to start a new uplink transmission within a first time.

[0238] For example, the first time in which the processing unit 910 executes the above method embodiment includes the second time and / or the third time and / or the fourth time and / or the fifth time and / or the sixth time and / or the seventh time.

[0239] For example, the second time during which the processing unit 910 executes the above method embodiment is the RRC processing time.

[0240] For example, the processing unit 910 executes the terminal in the above method embodiment to process RRC signaling containing indication condition LTM in the second time period.

[0241] For example, the processing unit 910 performs the third time in the above method embodiment as time uncertainty.

[0242] For example, the third time in the above method embodiment is the time from when the terminal successfully decodes the conditional LTM command to when a condition that can trigger conditional LTM exists at the measurement reference point.

[0243] For example, the processing unit 910 executes the fourth time in the above method embodiment as the measurement time.

[0244] For example, the processing unit 910 executes the fourth time in the above method embodiment as the time period from the end of the third time to the terminal performing LTM or handover to the target cell and the start of the fifth time.

[0245] For example, the fifth time in the above method embodiment is the interrupt time when the processing unit 910 executes it.

[0246] For example, the fifth time in the above method embodiment is the time period from when the terminal starts executing the conditional LTM to the target cell to when the terminal starts a new uplink transmission.

[0247] For example, the processing unit 910 executes the fifth time in the above method embodiment, which includes the first sub-time and / or the second sub-time and / or the third sub-time and / or the fourth sub-time.

[0248] For example, the first sub-time of the above method embodiment executed by the processing unit 910 is the terminal processing time, which includes the application of target cell parameters and / or changes to L1 or L2.

[0249] For example, the second sub-time in the above method embodiment is the time for fine time tracking and / or acquiring all timing information of the target cell.

[0250] For example, the processing unit 910 executes the third sub-time in the above method embodiment as the time for SSB processing.

[0251] For example, the processing unit 910 executes the fourth sub-time in the above method embodiment as the uncertainty of interruption or the uncertainty of sending the first uplink transmission.

[0252] For example, the sixth time in the above method embodiment is the terminal execution preparation time of conditional LTM, which is executed by the processing unit 910.

[0253] For example, the sixth time in the above method embodiment is when the terminal realizes that the condition of conditional LTM is met and / or the identifier or ID of the target cell is determined.

[0254] For example, the seventh time in the above method embodiment is the conditional LTM early synchronization or processing time, which is executed by the processing unit 910.

[0255] For example, the seventh time in the above method embodiment executed by the processing unit 910 includes the fifth sub-time and / or the sixth sub-time.

[0256] For example, the processing unit 910 executes the fifth sub-time in the above method embodiment as the TCI state activation time of the candidate cell or the target cell.

[0257] For example, the processing unit 910 executes the fifth sub-time period in the above method embodiment, in which the terminal completes the activation of the TCI state of the candidate cell or the target cell.

[0258] For example, the processing unit 910 executes the sixth sub-time in the above method embodiment as the uplink synchronization time.

[0259] For example, the processing unit 910 executes the above method embodiment, in the sixth sub-time period, the terminal completes uplink synchronization with the candidate cell or the target cell.

[0260] For example, the processing unit 910 may execute the following steps of the above method embodiment: the terminal receives RRC information indicating condition LTM, the information containing the configuration of condition LTM.

[0261] For example, the configuration of the processing unit 910 to execute the conditional LTM in the above method embodiments includes any one or more of the following:

[0262] Configuration of LTM candidate cells;

[0263] LTM execution conditions.

[0264] For example, the processing unit 910 performs the configuration of LTM candidate cells in the above method embodiments, including any one or more of the following:

[0265] LTM configuration: LTM-Config;

[0266] LTM candidate configuration LTM-Candidate;

[0267] LTM's CSI report configuration is LTM-CSI-ReportConfig;

[0268] LTM's CSI resource configuration is LTM-CSI-ResourceConfig;

[0269] Random access preamble for LTM candidate cells.

[0270] For example, the processing unit 910 can perform the following steps in the above method embodiment: when one or more LTM execution conditions are met, the execution condition LTM or condition LTM is switched, wherein the LTM execution conditions include one or more trigger conditions.

[0271] For example, the triggering conditions for the processing unit 910 to execute the above method embodiments include any one or more of the following:

[0272] The service quality of the service cell or the current cell is lower than the first threshold.

[0273] The service quality of the neighboring cell, candidate cell, or target cell is higher than the service quality of the serving cell, current cell, PCell, or PSCell by the first bias number.

[0274] The service quality of the serving cell, current cell, PCell, or PSCell is lower than the second threshold, while the service quality of the neighboring cell, SCell, candidate cell, or target cell is higher than the third threshold.

[0275] For example, the processing unit 910 may perform the following steps in the above method embodiment: evaluating whether the LTM execution conditions are met, wherein evaluating the LTM execution conditions includes: performing L1 and / or L3 measurements on the serving cell and / or LTM candidate cells.

[0276] For example, the processing unit 910 executes the evaluation reference signal of the LTM execution condition in the above method embodiment, which includes the synchronization signal block SSB and / or channel state information reference information CSI-RS;

[0277] The measured values ​​of the evaluation reference signal include any one or more of the following:

[0278] Reference signal received power RSRP;

[0279] Reference signal reception quality (RSRQ);

[0280] Signal-to-noise ratio (SINR).

[0281] For example, the processing unit 910 can perform the following steps in the above method embodiment: the evaluation reference signal for the LTM execution condition is the measurement object measured by L1 and / or L3;

[0282] The judgment object in the triggering condition is the L1 and / or L3 measurement results of the measurement value of the reference signal in the serving cell, current cell, PCell, PSCell, neighboring cell, SCell, candidate cell, or target cell.

[0283] For example, the processing unit 910 performing the execution conditional LTM or conditional LTM switching in the above method embodiments includes any one or more of the following:

[0284] Disconnected from the service area;

[0285] Switch to the target cell;

[0286] Configure the target cell for the application;

[0287] The target community is one of the candidate communities.

[0288] For example, the processing unit 910 can perform the following steps in the above method embodiment: the terminal sends RRCReconfigurationComplete to the network.

[0289] For example, the processing unit 910 can execute the following steps in the above method embodiment: the terminal performs conditional LTM or conditional LTM handover and switches to the target cell;

[0290] The handover is considered complete when the terminal sends the first uplink transmission to the target cell.

[0291] For example, the processing unit 910 can execute the following steps of the above method embodiment: if the terminal does not complete uplink synchronization with the candidate cell or the target cell within the seventh sub-time of the sixth time period, the first uplink transmission when the terminal performs conditional LTM or conditional LTM handover is a PRACH sent by the terminal; if the terminal completes uplink synchronization with the candidate cell or the target cell within the sixth sub-time of the seventh time period, the first uplink transmission when the terminal performs conditional LTM or conditional LTM handover is uplink data or uplink signaling.

[0292] Storage unit 920 may include readable media in the form of volatile storage units, such as random access memory (RAM) 9201 and / or cache memory 9202, and may further include read-only memory (ROM) 9203.

[0293] Storage unit 920 may also include a program / utility 9204 having a set (at least one) program module 9205, such program module 9205 including but not limited to: operating system, one or more application programs, other program modules and program data, each or some combination of these examples may include an implementation of a network environment.

[0294] Bus 930 can represent one or more of several types of bus structures, including a memory cell bus or memory cell controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the various bus structures.

[0295] Electronic device 900 can also communicate with one or more external devices 940 (e.g., keyboard, pointing device, Bluetooth device, etc.), and with one or more devices that enable a user to interact with electronic device 900, and / or with any device that enables electronic device 900 to communicate with one or more other computing devices (e.g., router, modem, etc.). This communication can be performed via input / output (I / O) interface 950. Furthermore, electronic device 900 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 960. As shown, network adapter 960 communicates with other modules of electronic device 900 via bus 930. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with electronic device 900, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0296] From the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, terminal device, or network device, etc.) to execute the methods according to the embodiments of this disclosure.

[0297] In particular, according to embodiments of this disclosure, the process described above with reference to the flowchart can be implemented as a computer program product, which includes a computer program that, when executed by a processor, implements the above-described cell handover method.

[0298] In exemplary embodiments of this disclosure, a computer-readable storage medium is also provided, which may be a readable signal medium or a readable storage medium. A program product capable of implementing the methods described above is stored thereon. In some possible implementations, various aspects of this disclosure may also be implemented as a program product including program code, which, when run on a terminal device, causes the terminal device to perform the steps described in the "Exemplary Methods" section of this specification according to various exemplary embodiments of this disclosure.

[0299] More specific examples of computer-readable storage media in this disclosure may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0300] In this disclosure, a computer-readable storage medium may include a data signal propagated in baseband or as part of a carrier wave, carrying readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium, capable of transmitting, propagating, or transmitting a program for use by or in connection with an instruction execution system, apparatus, or device.

[0301] Optionally, the program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination thereof.

[0302] In practical implementation, program code for performing the operations of this disclosure can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can execute entirely on the user's computing device, partially on the user's device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0303] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to embodiments of this disclosure, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0304] Furthermore, although the steps of the method in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps may be omitted, multiple steps may be combined into one step, and / or a step may be broken down into multiple steps.

[0305] From the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, mobile terminal, or network device, etc.) to execute the methods according to the embodiments of this disclosure.

[0306] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A cell handover method, characterized in that, include: When the terminal receives the RRC information indicating the LTM condition, it is ready to start a new uplink transmission as soon as possible.

2. The cell handover method according to claim 1, characterized in that, The first time includes the second and / or third and / or fourth and / or fifth and / or sixth and / or seventh time.

3. The cell handover method according to claim 2, characterized in that, The second time is the RRC processing time.

4. The cell handover method according to claim 2, characterized in that, The terminal processes RRC signaling containing indication condition LTM during the second time period.

5. The cell handover method according to claim 2, characterized in that, The third time refers to time uncertainty.

6. The cell handover method according to claim 2, characterized in that, The third time is the time interval from when the terminal successfully decodes the conditional LTM command to when a condition that can trigger conditional LTM exists at the measurement reference point.

7. The cell handover method according to claim 2, characterized in that, The fourth time is the measurement time.

8. The cell handover method according to claim 2, characterized in that, The fourth time period is the time from the end of the third time period to the terminal performing LTM or handover to the target cell and the start of the fifth time period.

9. The cell handover method according to claim 2, characterized in that, The fifth time is the interruption time.

10. The cell handover method according to claim 2, characterized in that, The fifth time period is the time interval from when the terminal starts executing the conditional LTM to the target cell to when the terminal starts a new uplink transmission.

11. The cell handover method according to claim 2, characterized in that, The fifth time includes the first sub-time and / or the second sub-time and / or the third sub-time and / or the fourth sub-time.

12. The cell handover method according to claim 11, characterized in that, The first sub-time is the terminal processing time, which includes changes to the target cell parameters and / or L1 or L2.

13. The cell handover method according to claim 11, characterized in that, The second sub-time is the time for fine-grained time tracking and / or for acquiring all timing information of the target cell.

14. The cell handover method according to claim 11, characterized in that, The third sub-time is the time for SSB processing.

15. The cell handover method according to claim 11, characterized in that, The fourth sub-time is the uncertainty of interruption or the uncertainty of sending the first uplink transmission.

16. The cell handover method according to claim 2, characterized in that, The sixth time is the terminal execution preparation time for conditional LTM.

17. The cell handover method according to claim 2, characterized in that, The sixth time begins when the terminal becomes aware that the conditions of the conditional LTM are met and / or the identifier or ID of the target cell is determined.

18. The cell handover method according to claim 2, characterized in that, The seventh time is the early synchronization or processing time of the conditional LTM.

19. The cell handover method according to claim 2, characterized in that, The seventh time includes the fifth sub-time and / or the sixth sub-time.

20. The cell handover method according to claim 19, characterized in that, The fifth sub-time is the TCI state activation time of the candidate cell or the target cell.

21. The cell handover method according to claim 19, characterized in that, During the fifth sub-time period, the terminal completes the activation of the candidate cell or target cell TCI state.

22. The cell handover method according to claim 19, characterized in that, The sixth sub-time is the uplink synchronization time.

23. The cell handover method according to claim 19, characterized in that, During the sixth sub-time period, the terminal completes uplink synchronization with the candidate cell or the target cell.

24. The cell handover method according to claim 1, characterized in that, The terminal receives RRC information indicating conditional LTM, the information including the configuration of conditional LTM.

25. The cell handover method according to claim 24, characterized in that, The configuration of the conditional LTM includes any one or more of the following: Configuration of LTM candidate cells; LTM execution conditions.

26. The cell handover method according to claim 25, characterized in that, The configuration of the LTM candidate cells includes any one or more of the following: LTM configuration: LTM-Config; LTM candidate configuration LTM-Candidate; LTM's CSI report configuration is LTM-CSI-ReportConfig; LTM's CSI resource configuration is LTM-CSI-ResourceConfig; Random access preamble for LTM candidate cells.

27. The cell handover method according to claim 25, characterized in that, The method further includes: When one or more LTM execution conditions are met, the execution condition LTM or conditional LTM is switched, wherein the LTM execution conditions include one or more trigger conditions.

28. The cell handover method according to claim 27, characterized in that, The triggering conditions include any one or more of the following: The service quality of the service cell or the current cell is lower than the first threshold. The service quality of the neighboring cell, candidate cell, or target cell is higher than the service quality of the serving cell, current cell, PCell, or PSCell by the first bias number. The service quality of the serving cell, current cell, PCell, or PSCell is lower than the second threshold, while the service quality of the neighboring cell, SCell, candidate cell, or target cell is higher than the third threshold.

29. The cell handover method according to claim 27, characterized in that, The method further includes: Evaluating whether the LTM execution conditions are met, wherein evaluating the LTM execution conditions includes performing L1 and / or L3 measurements on the serving cell and / or LTM candidate cells.

30. The cell handover method according to claim 29, characterized in that, The evaluation reference signals for the LTM execution conditions include the Synchronization Signal Block (SSB) and / or Channel State Information Reference Information (CSI-RS). The measured values ​​of the evaluation reference signal include any one or more of the following: Reference signal received power RSRP; Reference signal reception quality (RSRQ); Signal-to-noise ratio (SINR).

31. The cell handover method according to claim 30, characterized in that, The method further includes: The evaluation reference signal for the LTM execution conditions is the measurement object measured by L1 and / or L3; The judgment object in the triggering condition is the L1 and / or L3 measurement results of the evaluation reference signal in the serving cell, current cell, PCell, PSCell, neighboring cell, SCell, candidate cell, or target cell.

32. The cell handover method according to claim 27, characterized in that, The execution of conditional LTM or conditional LTM switching includes any one or more of the following: Disconnected from the service area; Switch to the target cell; Apply the configuration of the target cell; The target cell is one of the candidate cells.

33. The cell handover method according to claim 1, characterized in that, The terminal initiates a new uplink transmission within a first time interval, and the method further includes: The terminal sends RRCReconfigurationComplete to the network.

34. The cell handover method according to claim 1, characterized in that, The transmission in which the terminal initiates a new uplink transmission within the first time includes: The terminal performs conditional LTM or conditional LTM handover to switch to the target cell; The handover is considered complete when the terminal sends the first uplink transmission to the target cell.

35. The cell handover method according to claim 19, characterized in that, The method further includes: If the terminal fails to complete uplink synchronization with the candidate cell or the target cell within the seventh sub-time of the sixth time period, the first uplink transmission when the terminal performs conditional LTM or conditional LTM handover is the PRACH sent by the terminal. If the terminal completes uplink synchronization with the candidate cell or the target cell within the sixth sub-time period of the seventh time period, the first uplink transmission when the terminal performs conditional LTM or conditional LTM handover is uplink data or uplink signaling.

36. A cell handover device, characterized in that, include: The cell handover module is used to prepare to start a new uplink transmission as soon as possible when the terminal receives the RRC information of the indication condition LTM.

37. An electronic device, characterized in that, include: processor; as well as Memory for storing the executable instructions of the processor; The processor is configured to execute the cell handover method of any one of claims 1 to 35 by executing the executable instructions.

38. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the cell handover method according to any one of claims 1 to 35.

39. A computer program product comprising: A computer program or instruction, characterized in that, when executed by a processor, the computer program or instruction implements the cell handover method according to any one of claims 1 to 35.

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