An information transmission method, a communication node, a storage medium and a program product

Abstract

This application provides an information transmission method, a communication node, a storage medium, and a program product. The method includes: receiving a first configuration of mobile LTM triggered by Layer 1 / Layer 2, the first configuration including candidate secondary cell configuration; measuring the candidate secondary cells according to the first configuration and reporting the measurement results to configure the secondary cells; a first communication node receiving the first configuration of LTM, the first configuration including the candidate secondary cell configuration; the first communication node can measure the candidate secondary cells based on the first configuration and report the measurement results; the first communication node can complete the measurement and reporting of secondary cells before LTM handover through the first configuration, avoiding a decrease in data transmission rate and improving user experience.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and in particular to an information transmission method, a communication node, a storage medium, and a program product. Background Technology

[0002] For user equipment (UE) that supports carrier aggregation (CA) and is configured with one primary cell (PCell) and multiple secondary cells (SCell), the network can configure the current PCell and Sell as L1 / L2 triggered mobility candidate cells (LTM candidate cells).

[0003] When selecting an LTM candidate cell for the UE during the LTM preparation phase, the network primarily refers to the L3 measurement results reported by the UE. In existing technologies, when the target gNB is configured, the Radio Resource Control Reconfiguration (RRCReconfiguration) within the LTM candidateconfiguration corresponding to the candidate PCell either does not include SCell configuration or releases the SCell configuration. There is no method in existing technologies for configuring SCells. Summary of the Invention

[0004] This application provides an information transmission method, a communication node, a storage medium, and a program product to configure a secondary cell.

[0005] To achieve the above objectives, embodiments of this application provide an information transmission method applied to a first communication node, comprising:

[0006] The first configuration of mobile LTM triggered by layer 1 / layer 2, the first configuration including candidate secondary cell configuration;

[0007] The candidate secondary cells are measured according to the first configuration, and the measurement results are reported.

[0008] To achieve the above objectives, embodiments of this application provide another information transmission method applied to a second communication node, including:

[0009] Send the first configuration of LTM, which includes candidate secondary cell configuration;

[0010] Receive measurement results.

[0011] To achieve the above objectives, embodiments of this application provide a communication node, including: a memory, a processor, a program stored in the memory and executable on the processor, and a data bus for implementing communication between the processor and the memory. When the program is executed by the processor, it implements the steps of the information transmission method as described in any one of the embodiments of this application.

[0012] To achieve the above objectives, embodiments of this application provide a storage medium for computer-readable storage, wherein the storage medium stores one or more programs, which can be executed by one or more processors to implement the steps of the information transmission method described in any one of the embodiments of this application.

[0013] To achieve the above objectives, embodiments of this application provide a computer program product, which includes a computer program that, when executed by a processor, implements the information transmission method described in any one of the embodiments of this application.

[0014] The information transmission method, communication node, storage medium, and program product provided in this application embodiment include a first communication node receiving a first configuration of mobile LTM triggered by Layer 1 / Layer 2, the first configuration including candidate secondary cell configuration; measuring candidate secondary cells and reporting the measurement results according to the first configuration to configure secondary cells; the first communication node receiving the first configuration of LTM, the first configuration including candidate secondary cell configuration, the first communication node can measure candidate secondary cells based on the first configuration and report the measurement results; the first communication node can complete the measurement and reporting of secondary cells before LTM handover through the first configuration, avoiding a decrease in data transmission rate and improving user experience.

[0015] Further details regarding the above embodiments and other aspects of this application, as well as their implementations, are provided in the accompanying drawings, detailed description, and claims. Attached Figure Description

[0016] Figure 1 A flowchart illustrating an information transmission method provided in one embodiment;

[0017] Figure 2 A flowchart illustrating another information transmission method provided in one embodiment;

[0018] Figure 3a An example diagram illustrating a switching scenario for an Intra-DU MCG LTM implementation;

[0019] Figure 3bAn example diagram illustrating a switching scenario for Intra-CU inter-DU MCG / SCG LTM as provided in one embodiment;

[0020] Figure 3c An example diagram illustrating a switching scenario for an Inter-CU MCG / SCG LTM as provided in one embodiment;

[0021] Figure 4a An example diagram of a SCell change scenario in an intra-DU LTM scenario is provided as an embodiment;

[0022] Figure 4b An example diagram of a SCell change scenario in another intra-DU LTM scenario provided as an embodiment;

[0023] Figure 4c An example diagram of a SCell change scenario provided in one embodiment;

[0024] Figure 4d Example diagram of another SCell modification scenario provided in one embodiment;

[0025] Figure 4e An example diagram of a SCell change scenario in an intra-DU LTM scenario is provided as an embodiment;

[0026] Figure 4f An example diagram of a SCell change scenario in another intra-DU LTM scenario provided as an embodiment;

[0027] Figure 5 An implementation timing diagram of an LTM candidate SCell operation is provided as an example;

[0028] Figure 6a An example diagram of a candidate cell configuration provided in one embodiment;

[0029] Figure 6b Example diagram of another candidate cell configuration provided for one embodiment;

[0030] Figure 6c Example diagram of another candidate cell configuration provided for one embodiment;

[0031] Figure 6d Example diagram of another candidate cell configuration provided for one embodiment;

[0032] Figure 6e Example diagram of another candidate cell configuration provided for one embodiment;

[0033] Figure 6fExample diagram of another candidate cell configuration provided for one embodiment;

[0034] Figure 6g Example diagram of another candidate cell configuration provided for one embodiment;

[0035] Figure 6h Example diagram of another candidate cell configuration provided for one embodiment;

[0036] Figure 7a An example diagram of a candidate cell configuration provided in one embodiment;

[0037] Figure 7b Example diagram of another candidate cell configuration provided for one embodiment;

[0038] Figure 7c Example diagram of another candidate cell configuration provided for one embodiment;

[0039] Figure 7d Example diagram of another candidate cell configuration provided for one embodiment;

[0040] Figure 8 An example diagram illustrating a dynamically combined LTM candidate cell configuration is provided in one embodiment.

[0041] Figure 9 A schematic diagram of the structure of an information transmission device provided in one embodiment;

[0042] Figure 10 A schematic diagram of another information transmission device provided in one embodiment;

[0043] Figure 11 This is a schematic diagram of the structure of a communication node provided in one embodiment. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be arbitrarily combined with each other.

[0045] Traditional wireless communication networks rely primarily on Layer 3 (L3) channel measurement reports from user equipment (UEs) for mobility management (such as handover and cell selection) to determine whether to perform a handover. This process is implemented through RRC (Radio Resource Control) signaling. While this mechanism performs well in traditional cellular networks, its limitations are becoming increasingly apparent in high-density, high-mobility, and high-frequency scenarios. Specifically, the L3 handover process involves complex measurement reporting, decision-making, and execution steps, resulting in high handover latency (tens of milliseconds), which is insufficient to meet the demands of ultra-reliable low-latency communication scenarios. Furthermore, at cell edges, delayed handover can lead to connection interruptions or a sharp drop in data transmission rates, especially in FR2 / FR3 deployment scenarios where the link environment changes rapidly, and the L3 reporting mechanism's response is not fast enough, easily causing handover failures or dropped connections.

[0046] To address these challenges, 3GPP introduced LTM (L1 / L2-triggered Mobility) in Rel-18 / 19, aiming to achieve more efficient mobility management through a collaborative mechanism between the physical layer (L1) and the data link layer (L2). Compared to traditional L3 channel measurements during handover, in LTM, the UE can measure reference signals of its own cell and neighboring cells, such as the Synchronization Signal Block (SSB) or Channel State Information-Reference Signal (CSI-RS), to quickly detect link quality degradation and report the physical layer L1 measurement results to the base station. The base station then makes a rapid decision at the Medium Access Control (MAC) layer (L2) based on the measurement reports, triggering the UE to perform cell handover via the MAC control element (CE). In addition, LTM introduces pre-configuration of target candidate cells and advance processing of these cells, such as advance downlink / downlink synchronization to reduce downtime; it supports subsequent LTM to trigger cell handover more dynamically, improving mobility robustness; and it defines attempt LTM switch, so that when LTM execution fails, the UE can select another cell to try Random Access Channel (RACH)-based LTM execution again.

[0047] The introduction of LTM significantly improves the mobility management capabilities of wireless communication networks. It reduces handover latency from hundreds of milliseconds in traditional L3 mechanisms to milliseconds, and improves handover robustness by reserving handover resources and enabling rapid reconfiguration to reduce packet loss during handover, maintaining stable connections at cell edges or in high-speed mobility scenarios. Currently, the 3GPP standard standardizes LTM handover for both intra-CU and inter-CU. However, for UEs configured with carrier aggregation for high-throughput data transmission, LTM handover cannot guarantee that their SCells will continue to function properly, leading to a decrease in data transmission throughput before and after handover.

[0048] For UEs that support CA and are configured with one PCell and multiple SCells, the network can configure the current PCell and Sell as LTM candidate cells. By configuring the current SCell / PCell as a candidate cell, the L1 measurement results of the LTM candidate cell can be directly obtained by reusing the UE's measurements of the serving cell, without performing additional measurements. Since the LTM candidate cell is already the UE's serving cell before the cell change, the timing advance command (TA) acquisition process can be skipped for fast connection.

[0049] Furthermore, during LTM handover, the UE can maintain its original SCell while the PCell is being handed over, and it can also add or release SCells during the PCell handover. It's important to note that when LTM handover is performed on a PCell, the UE can obtain the RRCReconfiguration message from the source cell, which contains the LTM candidate cell configuration corresponding to the target PCell. This RRCReconfiguration message contains the target PCell configuration after the UE completes the LTM handover. Optionally, it can also include the SCell configuration aggregated with the target PCell. It's important to note that this RRCReconfiguration message is generated by the base station (target gNB) to which the target PCell belongs during the LTM preparation phase, and whether it includes the SCell configuration depends on the implementation of the target gNB.

[0050] When selecting an LTM candidate cell for the UE during the LTM preparation phase, the network primarily refers to the L3 measurement results reported by the UE. When the candidate target gNB generates RRCReconfiguration during the LTM preparation phase, it can also refer to the UE's reported L3 measurement results for neighboring cells to determine whether the UE is configuring aggregated SCells simultaneously with configuring candidate PCells. However, SCell configurations based on L3 measurements cannot reflect changes in dynamic channel conditions in a timely manner, leading to outdated configuration information. Therefore, a more prudent approach for the target gNB is to exclude SCell configuration from the RRCReconfiguration in the LTM candidate configuration corresponding to the candidate PCell, or to release the SCell configuration. Even if the RRCReconfiguration in the LTM candidate configuration corresponding to the candidate PCell includes SCell configuration, it is best to configure the SCell as inactive. After the UE completes the LTM cell handover, the target gNB triggers the UE to report CSI-RS measurements for the SCells, determines whether to activate them and which SCells to activate based on the measurement results, and only then can the UE transmit data within the SCells. However, this method of activating the SCell after the UE completes the LTM handover will cause a significant drop in the data rate before the SCell is activated after the UE performs the LTM handover, thus affecting the user experience.

[0051] Figure 1 A flowchart of an information transmission method provided in one embodiment, such as Figure 1 As shown, the information transmission method described in this application embodiment is applied to a first communication node, which, for example, may be a UE; the method includes S110-S120:

[0052] S110, the first configuration of mobile LTM triggered by receiving layer 1 / layer 2, the first configuration includes candidate secondary cell configuration.

[0053] In this embodiment, Layer 1 / Layer 2 triggered mobility is referred to as L1 / L2 triggered mobility, or LTM for short. The first configuration can be understood as configuration information or a message; the candidate secondary cell configuration can be understood as the relevant configuration information of the secondary cells that can be activated when the first communication node performs an LTM handover. This information can include one or more of the following: secondary cell identifier, secondary cell index, synchronization configuration, LTM candidate identifier, LTM secondary cell candidate identifier, channel state information reference signal resource configuration, etc. The first communication node can receive the first LTM configuration via wireless communication or other means, and the first configuration includes the candidate secondary cell configuration.

[0054] S120. Measure the candidate auxiliary cells according to the first configuration and report the measurement results.

[0055] Measuring candidate secondary cells according to the first configuration can be based on one or more relevant information such as measurement resources, measurement time, and measurement method, and then the measurement of candidate secondary cells can be performed based on this information. For example, the first configuration may determine that measurement is based on a Synchronization Signal Block (SSB), and determine information such as the period, offset, and duration of the SSB measurement window; or, the first configuration may determine that measurement is based on a Channel State Information-Reference Signal (CSI-RS). After completing the measurement of candidate secondary cells, the measurement results are reported. The reporting of measurement results can be based on a pre-agreed reporting method, the first configuration, or received reporting instructions or relevant configuration information, etc. When reporting measurement results according to the first configuration, the reporting method, time, content, and other reporting information can be determined based on the first configuration, and then the measurement results can be reported based on the reporting information.

[0056] The first configuration in this application embodiment may include the configuration of at least one of a primary cell and a candidate secondary cell (or a secondary cell), thereby enabling the configuration of at least one of the primary cell and the candidate secondary cell.

[0057] The information transmission method provided in this application embodiment involves a first communication node receiving a first configuration of mobile LTM triggered by Layer 1 / Layer 2, the first configuration including candidate secondary cell configuration; measuring the candidate secondary cells according to the first configuration and reporting the measurement results to configure the secondary cells; the first communication node receiving the first configuration of LTM, the first configuration including candidate secondary cell configuration, the first communication node can measure the candidate secondary cells based on the first configuration and report the measurement results; the first communication node can complete the measurement and reporting of secondary cells before LTM handover through the first configuration, avoiding a decrease in data transmission rate and improving user experience.

[0058] In some embodiments, the first configuration includes at least one of the following:

[0059] The first LTM candidate list includes the configuration of the first LTM candidate cell and / or the configuration of the LTM candidate secondary cell;

[0060] The second LTM candidate list and the LTM candidate secondary cell list, the second LTM candidate list includes the configuration of the second LTM candidate cells, and the LTM candidate secondary cell list contains the configuration of one or more LTM candidate secondary cells;

[0061] The third LTM candidate list includes the configuration of the third LTM candidate cells, and the configuration of the third LTM candidate cells includes the configuration of one or more LTM candidate secondary cells.

[0062] The fourth LTM candidate list includes the configuration of the fourth LTM candidate cells, which includes the configuration of the candidate cells as primary candidate cells and / or the configuration of the candidate cells as secondary candidate cells.

[0063] In this embodiment, the first LTM candidate list, the second LTM candidate list, the third LTM candidate list, and the fourth LTM candidate list can all be understood as lists including cell-related configuration information, i.e., different LTM candidate lists. The configuration of the first, second, third, and fourth LTM candidate cells can all be understood as configuration information related to cell configuration; it can be configured for either the PCell or the SCell. For example, the configuration of the first, second, and third LTM candidate cells can be configured for the PCell, and the configuration of the fourth LTM candidate cell can be configured for either the PCell or the SCell. The configuration of the LTM candidate secondary cells can be understood as configuration information related to the SCell. The LTM candidate secondary cell list can be understood as a list including configuration information related to secondary cells. Each of the above configurations can include one or more types of information such as cell identifier, index, and measurement resources.

[0064] In some embodiments, at least one of the configuration of the first LTM candidate cell, the configuration of the second LTM candidate cell, and the configuration of the third LTM candidate cell includes at least one of the following: one or more Radio Resource Control (RRC) reconfiguration messages, and a list of candidate secondary cells.

[0065] In this embodiment, the candidate secondary cell list can be understood as a list composed of secondary cells, that is, the candidate secondary cell list may include one or more secondary cells, and the candidate secondary cell list may also be called a candidate Scelllist. At least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, and the third LTM candidate cell may include at least one of the following: one or more Radio Resource Control (RRC) reconfiguration messages, and the candidate secondary cell list. Cell configuration can be achieved through the candidate secondary cell list via the RRC reconfiguration messages.

[0066] In some embodiments, an RRC reconfiguration message corresponds to a carrier aggregation combination, and each carrier aggregation combination includes the configuration of zero or one or more secondary cells.

[0067] Different carrier aggregation combinations can correspond to different RRC reconfiguration messages. Each carrier aggregation combination can configure the same or different primary and secondary cells. Each carrier aggregation combination can include the configuration of N secondary cells, where N can be a positive integer greater than or equal to 0.

[0068] In some embodiments, multiple RRC reconfiguration messages correspond to different secondary cell carrier aggregation combinations of the same primary cell.

[0069] Each RRC reconfiguration message corresponds to a different carrier aggregation combination. Multiple RRC reconfiguration messages correspond to the same primary cell but different secondary cells. This can also be described as multiple RRC reconfiguration messages corresponding to different secondary cell carrier aggregation combinations with the same primary cell.

[0070] In some embodiments, the secondary cell status contained in one or more RRC reconfiguration messages is active; and / or, the secondary cell status contained in one or more RRC reconfiguration messages is deactivated.

[0071] The status of the secondary cell in the RRC reconfiguration message can be determined by setting a default secondary cell status. For example, all secondary cell statuses contained in one or more RRC reconfiguration messages can be set to active; alternatively, a portion of the secondary cell statuses contained in one or more RRC reconfiguration messages can be set to active; alternatively, all secondary cell statuses contained in one or more RRC reconfiguration messages can be set to deactivated; alternatively, a portion of the secondary cell statuses contained in one or more RRC reconfiguration messages can be set to deactivated; alternatively, a portion of the secondary cell statuses contained in one or more RRC reconfiguration messages can be set to active, and a portion can be set to deactivated, and so on. The above setting methods can be used in combination, and this application embodiment does not limit this.

[0072] In some embodiments, at least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, the fourth LTM candidate cell, and the LTM secondary candidate cell includes at least one of the following:

[0073] LTM candidate identifier, LTM secondary cell candidate identifier, cell index, secondary cell index, candidate physical cell identifier (PCI), synchronization signal block configuration, channel state information reference signal (CSI-RS) resource configuration, early uplink synchronization configuration, transmission configuration indication (TCI) information, user equipment measurement timing advance indication, no reset indication, security change indication.

[0074] In this embodiment, the LTM candidate identifier, also known as the LTM Candidate Id, can be used to identify the primary cell; the LTM secondary cell candidate identifier, also known as the LTM SCell Candidate Id, can be used to identify the secondary cell; the candidate physical cell identifier, also known as the Candidate Physical Cell Identifier (Candidate PCI); the no-reset indication, also known as the NoReset indication; and the security change indication, also known as the securitychange indication. At least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, the fourth LTM candidate cell, and the LTM secondary candidate cell may include one of the above-mentioned pieces of information to configure the cell.

[0075] In some embodiments, the configuration of the fourth LTM candidate cell may further include at least one of the following: RRC transaction identifier, CSI resource configuration, non-cell group related configuration, cell group related configuration, and common cell related configuration.

[0076] In this implementation, the RRC transaction identifier can also be called the RRC transaction id, which can be used to identify the RRC process between the UE (User Equipment) and the network; non-cell-group related configuration can also be called non-cell-group specific configuration, such as one or more configurations such as air interface bearer configuration and measurement configuration; cell-group related configuration can also be called cell-group specific configuration; common cell-related configuration can also be called commoncell specific configuration.

[0077] In some embodiments, the candidate secondary cell list includes at least one secondary cell and information corresponding to each secondary cell;

[0078] Each secondary cell includes at least one of the following information:

[0079] LTM secondary cell candidate identifier, LTM candidate identifier, secondary cell index, candidate PCI, synchronization signal block configuration, CSI-RS resource configuration, early uplink synchronization configuration, TCI information, user equipment measurement timing advance indication.

[0080] In some embodiments, the first configuration further includes: reference configuration information.

[0081] In this embodiment, the reference configuration information can be understood as information used to configure a cell, which can be used to configure a primary cell or a secondary cell. The information types included in the reference configuration information can be the same as at least one of the first LTM candidate list, the second LTM candidate list, the LTM candidate secondary cell list, the third LTM candidate list, and the fourth LTM candidate list, or can include all information types contained in all of the above lists.

[0082] In some embodiments, at least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, the fourth LTM candidate cell, and the LTM candidate secondary cell includes differential configuration information that differs from the reference configuration information.

[0083] In this embodiment, the differential configuration information can be understood as configuration information different from the reference information. The reference information can be the reference configuration information itself, or information or values ​​within the reference configuration information. In this embodiment, the differential configuration information differs from the reference configuration information. The types of information contained in the differential configuration information may be the same as or different from the types of information contained in the reference configuration information. For example, the differential configuration information includes an LTM candidate identifier, and the reference configuration information includes an LTM secondary cell candidate identifier; or, the differential configuration information includes LTM candidate identifier 1 and LTM secondary cell candidate identifiers, and the reference configuration information includes LTM candidate identifier 2. At least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, the fourth LTM candidate cell, and the LTM secondary candidate cell includes differential configuration information, which differs from the reference configuration information.

[0084] In some embodiments, the method further includes:

[0085] The complete configuration information of LTM candidate cells and / or LTM candidate secondary cells is determined based on the reference configuration information and the differential configuration information.

[0086] Combining the reference configuration information and the differential configuration information yields the complete configuration information of the LTM candidate cell, or the complete configuration information of the LTM candidate secondary cell, or the complete configuration information of both the LTM candidate cell and the LTM candidate secondary cell. Taking the aforementioned differential configuration information and reference configuration information as an example, if the differential configuration information includes an LTM candidate identifier and the reference configuration information includes an LTM secondary cell candidate identifier, combining the reference configuration information and the differential configuration information yields LTM candidate identifier 1 and LTM secondary cell candidate identifier, which are used as the complete configuration information. If the differential configuration information includes LTM candidate identifier 1 and LTM secondary cell candidate identifier, and the reference configuration information includes LTM candidate identifier 2, combining the reference configuration information and the differential configuration information, with LTM candidate identifier 1 replacing the original LTM candidate identifier 1, yields LTM candidate identifier 2 and LTM secondary cell candidate identifier, which are used as the complete configuration information.

[0087] In some embodiments, the method further includes at least one of the following:

[0088] Early uplink synchronization of candidate cells is performed based on at least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, and the fourth LTM candidate cell.

[0089] Early downlink synchronization of candidate cells is performed based on at least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, and the fourth LTM candidate cell.

[0090] Early uplink synchronization of candidate secondary cells is performed based on the configuration of LTM candidate secondary cells;

[0091] Early downlink synchronization is performed on candidate secondary cells based on their LTM candidate secondary cell configuration.

[0092] That is, the method also includes at least one of the following:

[0093] Early uplink synchronization is performed on candidate cells based on the configuration of the first LTM candidate cell;

[0094] Early uplink synchronization is performed on the candidate cells based on the configuration of the second LTM candidate cells;

[0095] Early uplink synchronization is performed on candidate cells based on the configuration of the third LTM candidate cells;

[0096] Early uplink synchronization is performed on candidate cells based on the configuration of the fourth LTM candidate cell;

[0097] Early downlink synchronization is performed on candidate cells based on the configuration of the first LTM candidate cell;

[0098] Early downlink synchronization of candidate cells is performed based on the configuration of the second LTM candidate cells;

[0099] Early downlink synchronization of candidate cells is performed based on the configuration of the third LTM candidate cell;

[0100] Early downlink synchronization of candidate cells is performed based on the configuration of the fourth LTM candidate cell;

[0101] Early uplink synchronization of candidate secondary cells is performed based on the configuration of LTM candidate secondary cells;

[0102] Early downlink synchronization is performed on candidate secondary cells based on their LTM candidate secondary cell configuration.

[0103] In some embodiments, the first configuration further includes at least one of the following:

[0104] LTM CSI resource configuration;

[0105] LTM candidate secondary cell CSI resource allocation.

[0106] CSI reporting configuration for LTM candidate cells;

[0107] CSI reporting configuration for LTM candidate secondary cells.

[0108] In this embodiment, the LTM CSI resource configuration, also known as LTM CSI ResourceConfig, is used to configure the resource information used for measurement, and may include one or more information such as measurement resources, resource sets, and configuration identifiers. The LTM candidate secondary cell CSI resource configuration, also known as LTM Candidate Cell CSI ResourceConfig, is used to configure the resource information used for measurement, and can configure the measurement resources of candidate secondary cells or secondary cells, including one or more information such as measurement resources, resource sets, and configuration identifiers. The first communication node can perform measurements based on at least one of the LTM CSI resource configuration and the LTM candidate secondary cell CSI resource configuration.

[0109] The CSI reporting configuration of an LTM candidate cell, also known as the LTM candidate cell reporting configuration, can instruct on the reporting of measurement results, for example, indicating how to report CSI measurements of the candidate cell. Similarly, the CSI reporting configuration of an LTM candidate secondary cell, also known as the LTM candidate SCell reporting configuration, can instruct on the reporting of measurement results, for example, indicating how to report CSI measurements of the candidate secondary cell. The first communication node can report measurement results according to at least one of the LTM candidate cell CSI reporting configurations and the LTM candidate secondary cell CSI reporting configurations.

[0110] In some embodiments, the LTM CSI resource configuration includes at least one of the following:

[0111] LTM candidate secondary cell CSI resources, LTM candidate identifier, LTM secondary cell candidate identifier.

[0112] In some embodiments, the LTM CSI resource configuration includes at least one of the following:

[0113] LTM CSI resource configuration identifier, LTM synchronization signal block resource set, LTM synchronization signal block resource set of candidate secondary cell, LTM CSI-RS resource set, LTM CSI-RS resource set of candidate secondary cell.

[0114] In this embodiment, the LTM CSI resource configuration identifier can also be called LTM-CSI-ResourceConfigId, which can be used to identify different resource configurations; the LTM synchronization signal block resource set can also be called LTM SSBResourceSet, which can contain one or more LTM SSB resources; the LTM CSI-RS resource set can also be called LTMCSI-RS ResourceSet, which can contain one or more LTM CSI-RS resources.

[0115] In some embodiments, the LTM candidate secondary cell CSI resource configuration includes at least one of the following:

[0116] LTM secondary cell CSI resource configuration identifier, LTM synchronization signal block resource set of candidate secondary cell, LTM-CSI-RS resource set of candidate secondary cell.

[0117] In some embodiments, the LTM synchronization signal block resource set of the candidate secondary cell includes at least one of the following: LTM candidate identifier, LTM secondary cell candidate identifier, LTM candidate secondary cell identifier, LTM candidate secondary cell index, and synchronization signal block resource index.

[0118] In this embodiment, the LTM candidate secondary cell identifier can also be called the LTM Candidate SCell Id, which can be used to identify the configuration of LTM candidate secondary cells.

[0119] In some embodiments, the LTM CSI-RS resource set of the candidate secondary cell includes at least one of the following: LTM candidate identifier, LTM secondary cell candidate identifier, LTM candidate secondary cell identifier, LTM candidate secondary cell index, and CSI-RS resource identifier.

[0120] In some embodiments, measuring candidate secondary cells according to a first configuration includes at least one of the following:

[0121] Based on the received LTM CSI resource configuration, perform measurements on the corresponding CSI resources;

[0122] Based on the received LTM candidate secondary cell CSI resource configuration, measurements are performed on the corresponding CSI resources.

[0123] The first communication node determines the measurement resources, measurement time, and other necessary information based on the received LTM CSI resource configuration and / or LTM candidate secondary cell CSI resource configuration, and performs the measurement on the corresponding CSI resources. The measurement in this embodiment can be L1 measurement or other measurements.

[0124] In some embodiments, the CSI reporting configuration of LTM candidate cells and / or the CSI reporting configuration of LTM candidate secondary cells includes at least one of the following:

[0125] LTM CSI report configuration identifier, LTM CSI resource configuration identifier, LTM secondary cell CSI resource configuration identifier, report configuration type, report content.

[0126] In some embodiments, the LTM CSI report configuration identifier is associated with the LTM CSI resource configuration identifier; the method further includes at least one of the following:

[0127] When an LTM CSI resource configuration identifier is associated with multiple LTM synchronization signal block resource sets, the synchronization signal block resources contained in the multiple LTM synchronization signal block resource sets are sequentially indexed in ascending order to obtain the corresponding synchronization signal block resource indication.

[0128] When an LTM CSI resource configuration identifier is associated with multiple LTM CSI-RS resource sets, the CSI-RS resources contained in the multiple LTM CSI-RS resource sets are sequentially indexed in ascending order to obtain the corresponding CSI-RS resource indication.

[0129] If the LTM CSI Report Config Id is associated with a CSI resource corresponding to a LTM-CSI-ResourceConfigId that contains multiple SSB resource sets (i.e., the LTM CSI resource configuration identifier is associated with multiple LTM synchronization signal block resource sets), then the first communication node can sequentially index the synchronization signal block resources contained in the multiple LTM synchronization signal block resource sets in ascending order to obtain the corresponding synchronization signal block resource indicator. For example, starting from 0 or 1, sequentially indexing the SSB resources contained in the multiple SSB resource sets in ascending order can obtain the corresponding SSB Resource Indicator. Similarly, if the LTM CSI ResourceConfigId corresponds to a CSI resource that contains multiple CSI-RS resource sets (i.e., the LTM CSI resource configuration identifier is associated with multiple LTM CSI-RS resource sets), then the first communication node can sequentially index the CSI-RS resources contained in the multiple CSI-RS resource sets starting from 0 or 1 in ascending order to obtain the corresponding CSI-RS resource indicator.

[0130] In some embodiments, the first configuration further includes: valid information.

[0131] In this embodiment, valid information can be understood as information used to determine whether the first configuration is valid; the validity of the first configuration can be determined through valid information.

[0132] In some embodiments, valid information includes at least one of the following: valid area, valid time.

[0133] In some embodiments, the effective area includes at least one of the following: one or more tracking areas, one or more cells, one or more base stations, and physical area range.

[0134] In some embodiments, the valid information corresponds to at least one of the following: the configuration of the first LTM candidate cell, the configuration of the second LTM candidate cell, the configuration of the third LTM candidate cell, the configuration of the fourth LTM candidate cell, the configuration of the LTM secondary candidate cell, and reference configuration information.

[0135] That is, at least one of the following configurations can be associated with valid information: the configuration of the first LTM candidate cell, the configuration of the second LTM candidate cell, the configuration of the third LTM candidate cell, the configuration of the fourth LTM candidate cell, the configuration of the LTM candidate secondary cell, and the reference configuration information. The validity of the information is determined based on the valid information.

[0136] In some embodiments, the method further includes:

[0137] Receive LTM candidate secondary cell TCI status information, which is used to activate or deactivate the TCI status.

[0138] In this embodiment, the LTM candidate secondary cell TCI state information can be understood as information controlling the TCI state. For example, the LTM candidate secondary cell TCI state information can be the LTM candidate Scell ​​TCI state activation / deactivation MAC CE. The first communication node can receive the LTM candidate secondary cell TCI state information and, based on the indication or control of the LTM candidate secondary cell TCI state information, determine whether the TCI state is active or deactivated. The TCI state can be used by the first communication node for downlink synchronization of the candidate cell or candidate SCell.

[0139] In some embodiments, the LTM candidate secondary cell TCI status information includes at least one of the following:

[0140] LTM candidate secondary cell identifier, LTM candidate secondary cell index, LTM candidate identifier, LTM secondary cell candidate identifier, field containing the number of TCI states in the TCI code point, uplink indicator, downlink indicator, TCI state identifier.

[0141] In this embodiment, the field indicating the number of TCI states contained in a TCI code point can be a Pi field. The Pi field indicates whether each TCI (Transmission Configuration Indicator) code point contains multiple TCI states or only one TCI state. A TCI code point is also called a TCI codepoint, which is an identifier used to indicate the transmission configuration state. If the Pi field is set to 1, then the i-th TCI code point contains both downlink (DL) and uplink (UL) TCI states. If the Pi field is set to 0, then the i-th TCI code point contains only downlink / joint (DL / joint) TCI states or uplink (UL) TCI states. The code point mapped to a TCI state is determined by its position in the sequence number field of all TCI state ID fields. I can be an integer from 1 to 8, meaning the field indicating the number of TCI states contained in a TCI code point can be at least one of P1-P8.

[0142] In some embodiments, the LTM candidate secondary cell TCI status information is indicated by reserved bits in the LTM candidate cell TCI status information.

[0143] For example, a reserved "R" bit in the MAC CE indicates the TCI state information of the LTM candidate secondary cell. In some embodiments, the candidate cell TCI state activation / deactivation MAC CE can be reused to activate or deactivate the TCI state, and a new candidate SCell TCI state activation / deactivation MAC CE can be designed. The format of the MAC CE is the same as the existing candidate cell TCI state activation / deactivation MAC CE. A new logical channel ID can be assigned to this MAC CE to distinguish the TCI state activation / deactivation MAC CE of the candidate SCell and candidate PCell. Deactivation in this embodiment can also be referred to as inactivation.

[0144] In some embodiments, the measurement result includes at least one of the following:

[0145] Measurement results of LTM candidate secondary cells;

[0146] Measurement results of LTM candidate cells.

[0147] In some embodiments, the reported measurement results include at least one of the following:

[0148] LTM CSI report configuration identifier, candidate secondary cell indicator, candidate primary cell indicator, candidate secondary cell index, LTMCSI resource configuration identifier, LTM secondary cell CSI resource configuration identifier, synchronization signal block resource indicator, CSI-RS resource indicator, reference signal measurement value.

[0149] In some embodiments, the method further includes:

[0150] Receive LTM cell handover command, execute LTM handover and activate candidate secondary cells.

[0151] In this embodiment, the LTM cell handover command can be understood as a command instructing the first communication node to perform an LTM handover. For example, the LTM cell handover command could be `LTM cell switch command MAC CE`. The first communication node can receive the LTM cell handover command sent by the second communication node. The second communication node receives the measurement results reported by the first communication node, analyzes the measurement results to determine whether to perform an LTM handover, and if it determines to perform an LTM handover, generates and sends the LTM cell handover command to the first communication node. After receiving the LTM cell handover command, the first communication node performs the LTM handover, determines the candidate secondary cells to be activated, and activates the corresponding candidate secondary cells.

[0152] In some embodiments, the LTM cell handover command includes at least one of the following:

[0153] Target configuration identifier, LTM candidate identifier, primary cell indicator, primary cell advance timing command, TCI identifier, random access channel (RACH) resource.

[0154] In some embodiments, the LTM cell handover command includes at least one of the following:

[0155] The target configuration identifier of one or more secondary cells, one or more LTM secondary cell candidate identifiers, one or more LTM candidate secondary cell identifiers, one or more LTM candidate secondary cell indices, secondary cell activation bitmap, index of secondary cell to be activated, secondary cell advance timing command, advance timing command, TCI status identifier of secondary cell, RRC configuration index, RACH resource of secondary cell, secondary cell indicator, and secondary cell activation indicator.

[0156] In some embodiments, the method further includes:

[0157] The index of the secondary cell is determined according to the order of the target configuration identifier of the secondary cell, the candidate identifier of the LTM secondary cell, or the candidate identifier of the LTM secondary cell.

[0158] The index of the secondary cell is derived based on the order of the target configuration identifier, LTM secondary cell candidate identifier, or LTM candidate secondary cell identifier. For example, taking the target configuration identifier as an example, the target configuration identifier includes three cell identifiers. The cell indicated by the first identifier is considered a pcell, the cell indicated by the second identifier is considered a Scell, and 0 is used as the index of this Scell. The cell indicated by the third identifier is considered a Scell, and 1 is used as the index of this Scell. Alternatively, the number of target configuration identifiers is three: the cell indicated by the first target configuration identifier is considered a pcell, the cell indicated by the second target configuration identifier is considered a Scell, and 0 is used as the index of this Scell. The cell indicated by the third target configuration identifier is considered a Scell, and 1 is used as the index of this Scell.

[0159] In some embodiments, the method further includes:

[0160] The configuration information is obtained from the configuration of the fourth LTM candidate cell to determine the RRC configuration.

[0161] The configuration of the fourth LTM candidate cell includes different types of information. The corresponding configuration information is obtained from the configuration of the fourth LTM candidate cell as needed, according to instructions, or according to the pre-agreed information type. The RRC configuration is generated based on the obtained configuration information. For example, the obtained configuration information is used as the RRC configuration. Specifically, obtaining the corresponding configuration information from the configuration of the fourth LTM candidate cell as needed can be achieved by the first communication node analyzing and determining the type of configuration information required based on the service scenario and service data, and then obtaining the corresponding configuration information from the configuration of the fourth LTM candidate cell according to the required configuration information type; obtaining the corresponding configuration information from the configuration of the fourth LTM candidate cell according to an instruction can be achieved by the first communication node receiving an instruction sent by the second communication node or other communication nodes, the instruction carrying the type of configuration information required or indicating how the first communication node should determine the type of configuration information required, the first communication node determining the type of configuration information required based on the received instruction, and then obtaining the corresponding configuration information from the configuration of the fourth LTM candidate cell according to the required configuration information type; obtaining the corresponding configuration information from the configuration of the fourth LTM candidate cell according to a pre-agreed information type or other method can be achieved by the first communication node and the second communication node or other communication nodes pre-agreing on the type of configuration information required through negotiation or other methods, and then the first communication node obtaining the corresponding configuration information from the configuration of the fourth LTM candidate cell according to the required configuration information type.

[0162] In some embodiments, obtaining configuration information from the configuration of the fourth LTM candidate cell includes: determining the primary cell after handover and the secondary cell activated after handover; obtaining the primary cell-related configuration from the configuration of the fourth LTM candidate cell corresponding to the primary cell after handover; and obtaining the secondary cell-related configuration from the configuration of the fourth LTM candidate cell corresponding to the secondary cell activated after handover.

[0163] The process involves determining the primary cell after the handover and the secondary cell that becomes active after the handover. This can be done, for example, by analyzing the first configuration, or by using indication information or other methods. Next, the process involves determining the configuration of the fourth LTM candidate cell corresponding to the primary cell, reading the configuration of this fourth LTM candidate cell, and obtaining the relevant configuration of the primary cell. For example, obtaining the relevant configuration of the primary cell can be done when the primary cell is selected as the primary cell. Similarly, the process involves determining the configuration of the fourth LTM candidate cell corresponding to the secondary cell that becomes active after the handover, reading the configuration of this fourth LTM candidate cell, and obtaining the relevant configuration of the secondary cell. For example, obtaining the relevant configuration of the secondary cell can be done when the primary cell is selected as the secondary cell. The obtained primary cell-related configuration and secondary cell-related configuration are then used as the RRC configuration.

[0164] In some embodiments, performing an LTM handover includes: switching to a cell associated with a target configuration identifier.

[0165] In some embodiments, activating a secondary cell includes at least one of the following:

[0166] Activate the secondary cell corresponding to the target configuration identifier of the secondary cell;

[0167] Activate the LTM secondary cell candidate identifier of the secondary cell or the secondary cell corresponding to the LTM candidate secondary cell identifier;

[0168] The secondary cell corresponding to the LTM candidate secondary cell index of the activated secondary cell;

[0169] The RRC reconfiguration message associated with the activated target configuration identifier contains a secondary cell whose status is an activated secondary cell.

[0170] When the LTM cell handover command includes a target configuration identifier, the first communication node can determine the cell to be handed over to based on the target configuration identifier and switch to the cell corresponding to the target configuration identifier. When activating a secondary cell, the corresponding secondary cell can be determined and activated based on the secondary cell information in the LTM cell handover command; for example, the LTM cell handover command may include at least one of a target configuration identifier, an LTM secondary cell candidate identifier, an LTM candidate secondary cell identifier, and an LTM candidate secondary cell index. The secondary cell corresponding to at least one of the target configuration identifier, LTM secondary cell candidate identifier, LTM candidate secondary cell identifier, and LTM candidate secondary cell index can be activated. Alternatively, the associated RRC reconfiguration message can be determined based on the target configuration identifier, and the secondary cell status contained in the RRC reconfiguration message can be used to determine the secondary cells whose status is active, thus activating these secondary cells. Alternatively, the secondary cells to be activated can be determined based on the first configuration, and the corresponding secondary cells can be activated. Embodiments of this application can switch cells and activate corresponding secondary cells through one or more of the above methods.

[0171] In some embodiments, the method further includes:

[0172] Send an RRC reconfiguration complete message to the cell after handover;

[0173] The RRC reconfiguration completion message includes at least one of the following: RRC transaction identifier, LTM candidate identifier, LTM secondary cell candidate identifier, secondary cell identifier, and active secondary cell index.

[0174] In this embodiment, the RRC reconfiguration completion message can be used to indicate that the RRC configuration has been successfully reassembled; it may include at least one of the following: RRC transaction identifier, LTM candidate identifier, LTM secondary cell candidate identifier, secondary cell identifier, and activated secondary cell index.

[0175] In some embodiments, if the validity period has not expired, the first configuration-related information is used for LTM switching; if the validity period expires, the first configuration-related information is discarded.

[0176] That is, the relevant information of the first configuration can be used for LTM switching within the valid time. After the timeout, the first communication node can discard the relevant information of the first configuration and no longer use the invalid information for LTM switching.

[0177] In some embodiments, the method further includes:

[0178] If the updated first configuration is received before the validity period expires, the validity period will be reset.

[0179] In some embodiments, when the valid information includes a valid region and the first communication node is within the valid region, the first configuration-related information is available; and / or,

[0180] If the valid information contains a valid region but the first communication node is not within the valid region, the first configuration-related information is unavailable.

[0181] If the valid information includes a valid region, determine whether the first communication node is within the valid region. If the first communication node is within the valid region, the relevant information configured in the first configuration is available; if the first communication node is not within the valid region, the relevant information configured in the first configuration is unavailable.

[0182] The relevant information of the first configuration (or the relevant information of the first configuration) in the embodiments of this application may refer to all or part of the information within the first configuration.

[0183] This application provides multiple configuration methods. These methods can be used to configure candidate secondary and primary cells for the first communication node, enabling the UE to measure and synchronize candidate cells in advance before performing LTM handover. This allows the UE to activate cells while performing LTM handover, ensuring that the UE still has available cells after completing LTM handover, maintaining the data transmission rate, improving user experience, and effectively ensuring that the data throughput does not decrease before and after handover. Furthermore, flexible configuration can effectively reduce the signaling configuration overhead of each candidate primary and secondary cell.

[0184] Figure 2 A flowchart of another information transmission method provided in one embodiment, such as Figure 2 As shown, the information transmission method of this application embodiment is applied to a second communication node. For example, the second communication node can be a network, such as a base station; the method includes S210-S220:

[0185] S210. Send the first configuration of LTM, which includes the candidate secondary cell configuration.

[0186] The second communication node generates the first configuration of LTM, which can be generated according to a pre-agreed method and information such as the service scenario; the first configuration includes candidate secondary cell configurations. The second communication node can transmit the first configuration of LTM based on wireless communication or other methods.

[0187] S220, Receive measurement results.

[0188] The second communication node receives the measurement results, which can be used by the first communication node to measure and report candidate secondary cells according to the first configuration. The second communication node can then determine whether to perform LTM handover and activate secondary cells based on the measurement results.

[0189] The first configuration in this application embodiment may include the configuration of at least one of a primary cell and a candidate secondary cell (or a secondary cell), thereby enabling the configuration of at least one of the primary cell and the candidate secondary cell.

[0190] The information transmission method provided in this application embodiment involves a second communication node sending a first configuration of LTM, which includes a candidate secondary cell configuration. The first communication node can measure the candidate secondary cells and report the measurement results according to the first configuration to configure the secondary cells. The first communication node can complete the measurement and reporting of secondary cells before LTM handover through the first configuration, thereby avoiding a decrease in data transmission rate and improving user experience.

[0191] In some embodiments, the first configuration includes at least one of the following:

[0192] The first LTM candidate list includes the configuration of the first LTM candidate cell and / or the configuration of the LTM candidate secondary cell;

[0193] The second LTM candidate list and the LTM candidate secondary cell list, the second LTM candidate list includes the configuration of the second LTM candidate cells, and the LTM candidate secondary cell list contains the configuration of one or more LTM candidate secondary cells;

[0194] The third LTM candidate list includes the configuration of the third LTM candidate cells, and the configuration of the third LTM candidate cells includes the configuration of one or more LTM candidate secondary cells.

[0195] The fourth LTM candidate list includes the configuration of the fourth LTM candidate cells, which includes the configuration of the candidate cells as primary candidate cells and / or the configuration of the candidate cells as secondary candidate cells.

[0196] In some embodiments, at least one of the configuration of the first LTM candidate cell, the configuration of the second LTM candidate cell, and the configuration of the third LTM candidate cell includes at least one of the following: one or more Radio Resource Control (RRC) reconfiguration messages, and a list of candidate secondary cells.

[0197] In some embodiments, an RRC reconfiguration message corresponds to a carrier aggregation combination, and each carrier aggregation combination includes the configuration of zero or one or more secondary cells.

[0198] In some embodiments, multiple RRC reconfiguration messages correspond to different secondary cell carrier aggregation combinations of the same primary cell.

[0199] In some embodiments, the secondary cell status contained in one or more RRC reconfiguration messages is active; and / or, the secondary cell status contained in one or more RRC reconfiguration messages is deactivated.

[0200] In some embodiments, at least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, the fourth LTM candidate cell, and the LTM secondary candidate cell includes at least one of the following:

[0201] LTM candidate identifier, LTM secondary cell candidate identifier, cell index, secondary cell index, candidate physical cell identifier (PCI), synchronization signal block configuration, channel state information reference signal (CSI-RS) resource configuration, early uplink synchronization configuration, transmission configuration indication (TCI) information, user equipment measurement timing advance indication, no reset indication, security change indication.

[0202] In some embodiments, the configuration of the fourth LTM candidate cell may further include at least one of the following: RRC transaction identifier, CSI resource configuration, non-cell group related configuration, cell group related configuration, and common cell related configuration.

[0203] In some embodiments, the candidate secondary cell list includes at least one secondary cell and information corresponding to each secondary cell;

[0204] Each secondary cell includes at least one of the following information:

[0205] LTM secondary cell candidate identifier, LTM candidate identifier, secondary cell index, candidate PCI, synchronization signal block configuration, CSI-RS resource configuration, early uplink synchronization configuration, TCI information, user equipment measurement timing advance indication.

[0206] In some embodiments, the first configuration further includes: reference configuration information.

[0207] In some embodiments, at least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, the fourth LTM candidate cell, and the LTM candidate secondary cell includes differential configuration information that differs from the reference configuration information.

[0208] In some embodiments, the first configuration further includes at least one of the following:

[0209] LTM CSI resource configuration;

[0210] LTM candidate secondary cell CSI resource allocation.

[0211] CSI reporting configuration for LTM candidate cells;

[0212] CSI reporting configuration for LTM candidate secondary cells.

[0213] In some embodiments, the LTM CSI resource configuration includes at least one of the following:

[0214] LTM candidate secondary cell CSI resources, LTM candidate identifier, LTM secondary cell candidate identifier.

[0215] In some embodiments, the LTM CSI resource configuration includes at least one of the following:

[0216] LTM CSI resource configuration identifier, LTM synchronization signal block resource set, LTM synchronization signal block resource set of candidate secondary cell, LTM CSI-RS resource set, LTM CSI-RS resource set of candidate secondary cell.

[0217] In some embodiments, the LTM candidate secondary cell CSI resource configuration includes at least one of the following:

[0218] LTM secondary cell CSI resource configuration identifier, LTM synchronization signal block resource set of candidate secondary cell, LTM-CSI-RS resource set of candidate secondary cell.

[0219] In some embodiments, the LTM synchronization signal block resource set of the candidate secondary cell includes at least one of the following: LTM candidate identifier, LTM secondary cell candidate identifier, LTM candidate secondary cell identifier, LTM candidate secondary cell index, and synchronization signal block resource index.

[0220] In some embodiments, the LTM CSI-RS resource set of the candidate secondary cell includes at least one of the following: LTM candidate identifier, LTM secondary cell candidate identifier, LTM candidate secondary cell identifier, LTM candidate secondary cell index, and CSI-RS resource identifier.

[0221] In some embodiments, the CSI reporting configuration of LTM candidate cells and / or the CSI reporting configuration of LTM candidate secondary cells includes at least one of the following:

[0222] LTM CSI report configuration identifier, LTM CSI resource configuration identifier, LTM secondary cell CSI resource configuration identifier, report configuration type, report content.

[0223] In some embodiments, the first configuration further includes: valid information.

[0224] In some embodiments, valid information includes at least one of the following: valid area, valid time.

[0225] In some embodiments, the effective area includes at least one of the following: one or more tracking areas, one or more cells, one or more base stations, and physical area range.

[0226] In some embodiments, the valid information corresponds to at least one of the following: the configuration of the first LTM candidate cell, the configuration of the second LTM candidate cell, the configuration of the third LTM candidate cell, the configuration of the fourth LTM candidate cell, the configuration of the LTM secondary candidate cell, and reference configuration information.

[0227] In some embodiments, the method further includes:

[0228] Send LTM candidate secondary cell TCI status information, which is used to activate or deactivate the TCI status.

[0229] In some embodiments, the LTM candidate secondary cell TCI status information includes at least one of the following:

[0230] LTM candidate secondary cell identifier, LTM candidate secondary cell index, LTM candidate identifier, LTM secondary cell candidate identifier, field containing the number of TCI states in the TCI code point, uplink indicator, downlink indicator, TCI state identifier.

[0231] In some embodiments, the LTM candidate secondary cell TCI status information is indicated by reserved bits in the LTM candidate cell TCI status information.

[0232] In some embodiments, the measurement result includes at least one of the following:

[0233] Measurement results of LTM candidate secondary cells;

[0234] Measurement results of LTM candidate cells.

[0235] In some embodiments, the reported measurement results include at least one of the following:

[0236] LTM CSI report configuration identifier, candidate secondary cell indicator, candidate primary cell indicator, candidate secondary cell index, LTMCSI resource configuration identifier, LTM secondary cell CSI resource configuration identifier, synchronization signal block resource indicator, CSI-RS resource indicator, reference signal measurement value.

[0237] In some embodiments, the method further includes:

[0238] Send LTM cell handover command.

[0239] In some embodiments, the LTM cell handover command includes at least one of the following:

[0240] Target configuration identifier, LTM candidate identifier, primary cell indicator, primary cell advance timing command, TCI identifier, random access channel (RACH) resource.

[0241] In some embodiments, the LTM cell handover command includes at least one of the following:

[0242] The target configuration identifier of one or more secondary cells, one or more LTM secondary cell candidate identifiers, one or more LTM candidate secondary cell identifiers, one or more LTM candidate secondary cell indices, secondary cell activation bitmap, index of secondary cell to be activated, secondary cell advance timing command, advance timing command, TCI status identifier of secondary cell, RRC configuration index, RACH resource of secondary cell, secondary cell indicator, and secondary cell activation indicator.

[0243] In some embodiments, if the validity period has not expired, the first configuration-related information is used for LTM switching; if the validity period expires, the first configuration-related information is discarded.

[0244] In some embodiments, the method further includes: sending an updated first configuration.

[0245] In some embodiments, when the valid information includes a valid region and the first communication node is within the valid region, the first configuration-related information is available; and / or,

[0246] If the valid information contains a valid region but the first communication node is not within the valid region, the first configuration-related information is unavailable.

[0247] The information transmission process is illustrated by the following embodiments. For example, the first communication node can be a UE, and the second communication node can be a network:

[0248] Generally, the activation and deactivation of SCells during the LTM process can be considered in the following scenarios:

[0249] 1. Non-Dual Connectivity (Non-DC) Scenarios:

[0250] In the same Intra-Distributed Unit (Intra-DU) Master Cell Group (MCG) LTM+MCG CA;

[0251] The same Intra-Central Unit (Intra-CU) with different Inter-Distributed Units (inter-DU) MCG LTM+MCG CA;

[0252] Different Inter-Central Units (Inter-CU) MCG LTM+MCG CA;

[0253] 2. Intra-CU inter-DU DC scenario (MCG and Secondary Cell Group (SCG) belong to different DUs but have the same CU):

[0254] Intra-DU MCG / SCG LTM;

[0255] Intra-CU inter-DU MCG / SCG LTM;

[0256] Inter-CU inter-DU MCG / SCG LTM;

[0257] 3. Inter-CU DC Scene (MCG and SCG belong to different CUs):

[0258] Intra-DU MCG / SCG LTM;

[0259] Intra-CU inter-DU MCG / SCG LTM;

[0260] Inter-CU inter-DU MCG / SCG LTM.

[0261] For example, Figure 3a An example diagram of a switching scenario for Intra-DU MCG LTM is provided; Figure 3b An example diagram of a switching scenario for Intra-CU inter-DU MCG / SCG LTM is provided; Figure 3c An example diagram of a switching scene for Inter-CU MCG / SCGLTM is provided.

[0262] From a network perspective, during LTM, SCell activation / deactivation should consider factors such as UE service demands, PCell / SCell throughput changes, L1 / L3 measurement results, DL / UL synchronization status, and load balancing or energy-saving considerations. Specifically:

[0263] 1) Changes in UE service requirements and PCell / SCell throughput

[0264] When the UE’s data requirements and the current / target PCell and / or current SCell data transmission throughput do not change, the current SCell should remain active during PCell LTM handover.

[0265] When the UE’s data demand increases and / or the current / target PCell data transmission throughput decreases or the current SCell data transmission throughput decreases, one or more new SCells can be added and activated during LTM cell handover;

[0266] When a user’s data demand decreases and / or the current / target PCell data transmission throughput increases, one or more current SCells can be deactivated or released during PCellLTM switching.

[0267] 2) L1 / L3 measurement results

[0268] If the measurement result of the current SCell or a candidate SCell (e.g., Reference Signal Received Power (RSRP)) exceeds a given threshold, the SCell can be activated;

[0269] If the measurement result (e.g., RSRP) of the current SCell or candidate SCell falls below the threshold, the SCell can be deactivated.

[0270] 3) DL / UL synchronization

[0271] If the UE has completed UL synchronization and / or DL ​​synchronization with the candidate SCell, the candidate SCell can be activated; otherwise, even if the candidate SCell is added as a SCell of the UE, it should be deactivated.

[0272] Assuming SCell and PCell belong to the same Time Advancing Group (TAG), the UE can reuse the TA of PCell as the TA of SCell. However, if SCell and PCell belong to different TAGs, the UE still needs to perform a random access procedure to obtain UL synchronization with the candidate Scell.

[0273] 4) Load balancing or energy saving considerations

[0274] During LTM switching, the current SCell may be deactivated for load balancing (e.g., SCell overload) or power saving purposes.

[0275] For LTM scenarios that support carrier aggregation, SCell change scenarios can be considered. For example, 4a provides an example diagram of a SCell change scenario in an intra-DU LTM scenario, corresponding to a scenario where the PCell changes while the SCell remains unchanged. 4b provides another example diagram of a SCell change scenario in an intra-DU LTM scenario, corresponding to a scenario where the PCell changes and a new SCell is added to the original SCell. Figure 4c An example diagram is provided for a SCell change scenario, corresponding to a scenario where the PCell changes and the original SCell is released in an intra-DU, inter-DU, or inter-CU LTM scenario. Figure 4d This provides an example diagram of another SCell change scenario, corresponding to the intra-DU, inter-DU, or inter-CULTM scenario where the PCell changes, the original SCell is released, and a new SCell is added. Figure 4e An example diagram is provided for a SCell change scenario in an intra-DU LTM scenario, corresponding to a scenario where the PCell remains unchanged, the original SCell is released, and a new SCell is added. Figure 4f This provides an example diagram of another intra-DU LTM scenario where the SCell is changed, corresponding to a scenario where the PCell remains unchanged and a new SCell is added.

[0276] Assuming the UE uses LTM handover, the network can send LTM candidate cell configuration to the UE before the handover. The LTM candidate cell configuration includes the candidate cell's PCI, SSB, CSI-RS, early sync configuration, and an RRCReconfiguration message for the LTM candidate cell as a PCell. The RRCReconfiguration message for the LTM candidate cell can be used by the UE after the LTM cell handover. Specifically, as... Figure 4dAs shown, the UE is configured with cell 1 (PCell) and cell 2 (Scell) before handover, and with cell 3 (PCell) and cell 4 (SCell) after handover. Assume that before handover, the UE receives two LTM candidate cell configurations with LTM candidate cell configuration identifiers 1 and 2 from the network. The LTM candidate configuration corresponding to LTM candidate cell configuration identifier 1 includes the PCI, SSB, CSI-RS, and early sync configurations for cell 3, as well as an RRCReconfiguration message with cell 3 as PCell and cell 4 as SCell. The LTM candidate configuration corresponding to LTM candidate cell configuration identifier 2 includes the PCI, SSB, CSI-RS, and early sync configurations for cell 4, as well as an RRCReconfiguration message with cell 4 as PCell and cell 2 as SCell.

[0277] After the UE completes L1 measurement and reporting of CSI resources according to the LTM configuration, the network can decide whether to allow the UE to perform an LTM handover based on the measurement results, and send an LTM cell switch command MAC CE to the UE, requesting the UE to switch to the configuration corresponding to LTM candidate cell configuration identifier 1. Upon receiving the LTM cell switch command MAC CE, the UE uses the RRCReconfiguration message contained in the configuration corresponding to LTM candidate cell configuration identifier 1. As described above, this RRCReconfiguration message contains the relevant configurations for cell 3 as the PCell and cell 4 as the SCell. Subsequently, the UE will transmit data with cell 3 (PCell) and cell 4 (SCell) after completing the handover according to the corresponding configurations.

[0278] It is important to note that the LTM configuration corresponding to LTM candidate cell configuration identifier 2 includes the PCI, SSB, CSI-RS, and early sync configurations for cell 4. This information can be used by the UE to perform L1 measurements on cell 4 and conduct early UL / DL synchronization before LTM handover. However, after the UE performs LTM cell handover, although cell 4 is configured as a SCell, the UE will not use the RRC reconfiguration information for cell 4 included in the LTM configuration corresponding to LTM candidate cell configuration identifier 2.

[0279] As the above analysis shows, cell 4, as an LTM candidate cell, may become the target PCell or the target SCell after the UE completes the LTM handover. In addition, there is another type of LTM candidate cell, such as an SSB-less cell or an FR2 cell, which is only suitable as an Scell ​​and not as a PCell. How to configure this type of LTM candidate cell requires further consideration.

[0280] This application provides implementation methods for LTM candidate SCell configuration designs for various SCell configuration scenarios corresponding to UE LTM handover, considering different cell types. Implementation methods 1-3 are configuration methods for LTM candidate cells that can only serve as Scells, while implementation methods 4-7 are configuration methods for LTM candidate cells that can serve as both PCells and SCells in carrier aggregation scenarios.

[0281] Implementation Method 1

[0282] This embodiment is a method for reusing an LTM candidate list for LTM candidate cell configuration; for example, the first configuration is an LTM configuration, the first LTM candidate list is an LTM candidate list, the configuration of the first LTM candidate cell is the configuration of the first LTM candidate cell, and the configuration of the LTM candidate secondary cell is the configuration of the second LTM candidate cell.

[0283] The UE receives the LTM configuration from the network. The LTM configuration contains an LTM candidate list, which includes two LTM candidate cell configurations. The first LTM candidate cell configuration contains the configuration of candidate cell 1. In some embodiments, this may include one or more messages such as LTM-CandidateId, LTM SCellCandidateId, cell index, secondary cell index, candidatePCI, SSB config, CSI resource config, early UL synchronization configuration, TCI information, UE measurement TA, and RRC reconfiguration message for candidate cell 1 as a PCell. It should be noted that this RRC reconfiguration information may further include the configuration of SCell 2. The second LTM candidate cell configuration contains the configuration of candidate SCell 2. Since a candidate SCell can only function as an SCell, the network reuses the LTM candidate list to send the configuration of LTM candidate SCell 2 to the UE. Corresponding to LTM candidate SCell2, the LTM candidate cell configuration may include one or more of the following information: LTM-CandidateId, LTM SCellCandidateId, cell index, secondary cell index, candidatePCI, SSB configuration, CSI resource configuration, early UL synchronization configuration, TCI information, UE measurement TA, etc., but does not need to include RRCReconfiguration information. The UE can perform one or more processes such as early UL synchronization and early DL synchronization on candidate cell 1 and candidatescell 2 according to the configuration included in the LTM candidate list.

[0284] The LTM configuration received by the UE from the network also includes an LTM CSI ResourceConfig. This LTM CSI ResourceConfig may contain the CSI resource corresponding to the LTM candidate SCell, as well as the corresponding LTM-CandidateId and / or LTM SCell CandidateId. In some embodiments, the LTM CSI ResourceConfig may contain one or more of the following information: ltm-CSI-ResourceConfigId, ltm-SSB-ResourceSet, ltm-CSI-RS-ResourceSet, etc. The ltm-SSB-ResourceSet or ltm-CSI-RS-ResourceSet may further contain the SSB or CSI-RS resource corresponding to the LTM candidate SCell, and one or more of the following information: the corresponding LTM-CandidateId, etc. After receiving this configuration, the UE can begin L1 measurement on the corresponding CSI resource (such as SSB and / or CSI-RS).

[0285] Furthermore, the LTM configuration received by the UE from the network can also include reporting configurations for LTM candidate SCells. The reporting configuration for LTM candidate SCells can reuse existing LTM-CSI-ReportConfig. For example, the configuration of the current serving cell received by the UE can include LTM-CSI-ReportConfig, which contains one or more pieces of information such as ltm-CSI-ResourceConfigId, report config type, and report content. The ltm-CSI-ResourceConfigId can be associated with the CSIresource of the LTM candidate SCell. The UE can report the measurement results of the LTM candidate SCell and / or other candidate cells to the network according to the received LTM reporting configuration.

[0286] After receiving the measurement report from the UE, the network determines whether the UE needs to perform an LTM handover, the corresponding target PCell and target SCell, and whether to activate the target SCell. If the network determines that the UE should perform an LTM handover to candidate cell 1 and activate candidate SCell 2, the network can send an LTM cell switch command MAC CE to the UE. The LTM cell switch command MAC CE received by the UE may contain at least one of the following information: target configid, LTM candidateid, PCell indication, target LTM candidate configid, bitmap for SCell activation or index of SCell to be activated, PCell TA, SCell TA, etc. Based on the received LTM cell switch command MAC CE, the UE performs an LTM handover to PCell 1 and activates SCell 2 simultaneously.

[0287] The advantage of this LTM candidate SCell configuration method is that the network reuses the LTM candidate list to assign an LTM candidate ID to each candidate SCell, thereby reusing L1 measurement CSI resource configuration, LTM CSI reporting, and LTM cell switch commands based on the LTM candidate ID. However, this method results in the LTM candidate SCell configuration occupying LTM candidate ID allocation space (currently only 8 LTM candidate cells are supported). The introduction of LTM candidate SCells means that the number of LTM candidate PCells must be reduced.

[0288] For example, Figure 5 A timing diagram for the operation of an LTM candidate SCell is provided, including the configuration, measurement, handover, and activation of the LTM candidate SCell. Taking a Radio Access Network (RAN) as an example, the steps include:

[0289] 1. LTM candidate SCell configuration (cell 2).

[0290] 2. The UE performs L1 measurement, early DL synchronization, and early UL synchronization on the candidate Scell.

[0291] 3. The UE sends the L1 measurement report of candidate SCell2.

[0292] 4. The RAN sends the LTM cell handover command MAC CE.

[0293] 5. The UE performs an LTM operation to activate cell 2 as the target secondary cell.

[0294] Implementation Method 2

[0295] This implementation provides a new LTM candidate list for SCells and a new LTM SCell CSIResourceConfig for configuring candidate SCells. For example, the first configuration is the LTM configuration, the second LTM candidate list is the LTM candidate list, the LTM candidate secondary cell list is the LTM candidate SCell list, and the configuration of the LTM candidate secondary cells is the configuration of the LTM candidate SCells.

[0296] The UE receives the LTM configuration from the network. The LTM configuration includes an LTM candidate list and an LTM candidate SCell list. The LTM candidate list contains the configurations of one or more LTM candidate PCells, while the LTM candidate SCell list contains the configurations of one or more LTM candidate SCells. The LTM candidate SCell configuration includes one or more pieces of information such as the LTM Candidate SCell ID, candidatePCI, SSB configuration, CSIresource configuration, early UL synchronization configuration, TCI information, and UE measurement TA. The LTM candidate SCell configuration does not need to include RRCReconfiguration information. The UE can perform one or more procedures such as early UL synchronization and early DL synchronization on the candidate SCells based on the configurations contained in the LTM candidate SCell list.

[0297] The LTM configuration received by the UE from the network also includes at least one of LTM CSI ResourceConfig, LTM SCell CSIResourceConfig, and LTM Candidate SCell CSI ResourceConfig. The LTM SCell CSI ResourceConfig and / or LTM Candidate SCell CSI ResourceConfig may contain at least one of the following information: LTM SCell CSI Resource Config ID, ltm-SSB-ResourceSet for SCell, ltm-SSB-ResourceSet for Candidate SCell, ltm-CSI-RS-ResourceSet for SCell, and ltm-CSI-RS-ResourceSet for Candidate SCell. The ltm-SSB-ResourceSet for SCell may contain at least one of the following information: LTM Candidate SCell ID or LTM Candidate SCellIndex, and SSB resource index. The ltm-CSI-RS-ResourceSet for SCell may contain at least one of the following: LTM Candidate SCell Id or LTM Candidate SCell Index, CSI-RS resource Id. After receiving this configuration, the UE can start L1 measurements on the CSI resource (such as SSB and / or CSI-RS) corresponding to the candidate SCell.

[0298] In addition, the LTM configuration received by the UE from the network may also include reporting configurations for LTM candidate SCells. The reporting configuration for LTM candidate SCells can reuse existing LTM-CSI-ReportConfig. For example, the configuration of the current serving cell received by the UE may include LTM-CSI-ReportConfig, which contains one or more of the following information: LTM CSI Report Config ID, LTM CSI Resource Config ID, LTM SCell CSIResource Config ID, report config type, and report content. The LTM SCell CSI Resource Config ID can be associated with ltm-SSB-ResourceSet for SCell and / or ltm-CSI-RS-ResourceSet for SCell. The UE can report measurement results for LTM candidate SCells and / or other candidate cells to the network according to the received LTM reporting configuration. It is important to note that when the UE reports the measurement results for the candidate cell, it must include at least one of the following information in the measurement report: LTM CSIReport Config Id, Scell ​​indicator, PCell indicator, LTM CSI Resource Config Id, LTM SCell CSIResource Config Id, SSB Resource Indicator, CSI-RS resource indicator, reference signal measurement value corresponding to the SSBResource Indicator, and reference signal measurement value corresponding to the CSI-RS resource indicator.

[0299] After receiving the measurement report from the UE, the network determines which TCI states are activated for downlink synchronization of the candidate cell or candidate Scell ​​by the UE, and then sends an LTM candidate Scell ​​TCI stateactivation / deactivation MAC CE to the UE. In some embodiments, the LTM candidate Scell ​​TCI stateactivation / deactivation MAC CE may contain at least one of the following information: LTM Candidate SCell ID, LTM Candidate SCell index, LTM candidate SCell config ID, P1-P8, D / U, and TCI state ID, etc. Alternatively, the candidate cell TCI state activation / deactivation MAC CE can be reused, and a reserved "R" bit in the MAC CE can be used to indicate the LTM candidate ID of the SCell (i.e., LTM CandidateSCell ID). In some embodiments, new candidate SCell TCI state activation / deactivation MAC CEs can also be designed. The format of the MAC CE is the same as that of the existing candidate cell TCI state activation / deactivation MAC CEs. The difference lies in assigning a new logical channel ID to this MAC CE to distinguish the TCI state activation / deactivation MAC CE of the candidate SCell and candidate PCell.

[0300] After receiving the measurement report from the UE, the network determines whether the UE needs to perform an LTM handover, the corresponding target PCell and target SCell, and whether to activate the target SCell. If the network determines that the UE should perform an LTM handover to candidate cell 1 and activate candidate SCell 2, the network can send an LTM cell switch command MAC CE to the UE. The LTM cell switch command MAC CE received by the UE may contain at least one of the following information: target config id, LTM candidate id, PCell indication, target LTM candidate config id, TA, TCI ID, RACH resource information, and one or more target config IDs of SCells. Corresponding to each target config ID of SCell, the LTM cell switch command MAC CE may also contain at least one of the following information: TA of SCell, TCI state ID of SCell, etc. The UE performs an LTM handover based on the received LTM cell switchcommand MAC CE, switching to PCell 1 corresponding to the target LTM candidate config id, and simultaneously activating SCell2 corresponding to the target config ID of SCell.

[0301] Compared to implementation method 1, a new LTM candidate list for SCell is designed, which does not occupy the LTM candidate ID space of the PCell. This allows the network to configure more LTM candidate SCells for the UE while supporting a maximum of 8 candidate PCells.

[0302] Implementation Method 3

[0303] This implementation includes the configuration of the candidate SCell in the LTM candidate cell configuration corresponding to the PCell. For example, the first configuration is the LTM configuration, the third LTM candidate list is the LTM candidate list, the configuration of the third LTM candidate cell is the LTM candidate cell configuration, and the candidate secondary cell list is the candidate SCelllist.

[0304] The UE receives the LTM configuration from the network. The LTM configuration includes an LTM candidate list. This LTM candidate list contains the configurations of one or more LTM candidate cells. The configuration of each LTM candidate cell includes one or more of the following: LTMCandidate Id, candidatePCI, SSB config, CSI resource config, early UL synchronization configuration, TCI information, UE measurement TA, and RRCReconfiguration information. The RRCReconfiguration information includes the relevant configurations for PCell 1 and SCell 2. The PCI of PCell 1 is the same as the candidatePCI included in the LTM candidate cell configuration. The SSB config, CSI resource config, early UL synchronization configuration, TCI information, and UE measurement TA included in the LTM candidate cell configuration also correspond to the configuration of PCell 1. Additionally, the LTM candidate cell configuration may also include a candidate SCelllist. For each SCell in the candidate Scell ​​list, it may further include at least one of the following information: LTM Candidate SCell Id, LTM SCellCandidate Id, LTM Candidate Id, Scell ​​index, candidatePCI, SSB configuration, CSIresource configuration, CSI-RS resource configuration, early UL synchronization configuration, TCI information, UE measurement TA, etc. In this embodiment, the candidate SCell list includes the relevant configuration of SCell2. The UE can perform one or more processes such as early UL sync and early DL sync on the candidate Pcell and Scell ​​according to the configuration included in the LTM candidate list.

[0305] The LTM configuration received by the UE from the network may also include LTM CSI ResourceConfig, which may contain at least one of the following: ltm-CSI-ResourceConfigId, ltm-SSB-ResourceSet, ltm-SSB-ResourceSet for SCell, ltm-SSB-ResourceSet for CandidateSCell, ltm-CSI-RS-ResourceSet, ltm-CSI-RS-ResourceSet for SCell, and ltm-CSI-RS-ResourceSet for Candidate SCell. The ltm-SSB-ResourceSet for SCell and / or the ltm-SSB-ResourceSet for Candidate SCell may contain at least one of the following: LTM Candidate Id, LTM SCell Candidate Id, LTM Candidate SCell Id, LTM Candidate SCell Index, and SSBresource Index. The `ltm-CSI-RS-ResourceSet for SCell` and / or `ltm-CSI-RS-ResourceSet for Candidate SCell` may contain at least one of the following information: LTM Candidate Id, LTM SCell ICandidate Id, LTM Candidate SCell Id, LTM Candidate SCell Index, and CSI-RS resourceId. Upon receiving this configuration, the UE can begin L1 measurements on the CSI resource (such as SSB and / or CSI-RS) corresponding to the candidate SCell.

[0306] In addition, the LTM configuration received by the UE from the network can also include reporting configurations for LTM candidate SCells. The reporting configurations for LTM candidate SCells can reuse existing LTM-CSI-ReportConfig. For example, the configuration of the current serving cell received by the UE can include LTM-CSI-ReportConfig, which contains configurations such as LTM CSI Report Config Id, ltm-CSI-ResourceConfigId, report config type, and report content. The ltm-CSI-ResourceConfigId can be associated with ltm-SSB-ResourceSet for SCell and / or ltm-CSI-RS-ResourceSet for SCell. The UE can report measurement results for LTM candidate SCells and / or other candidate cells to the network according to the received LTM reporting configurations. It is important to note that when reporting measurement results for a candidate cell, the UE must include the LTMCSI Report Config Id, SSB Resource Indicator, and / or CSI-RS resource indicator, along with the corresponding reference signal measurement value, in the measurement report. Considering that the CSI resource corresponding to the ltm-CSI-ResourceConfigId associated with the LTM CSI Report Config Id contains multiple SSB resource sets, the UE can sequentially index the SSB resources contained in the multiple SSB resource sets, starting from 0 or 1 in ascending order, to obtain the corresponding SSB Resource Indicator. Similarly, if the CSI resource corresponding to the ltm-CSI-ResourceConfigId contains multiple CSI-RS resource sets, the UE can sequentially index the CSI-RS resources contained in the multiple CSI-RS resource sets, starting from 0 or 1 in ascending order, to obtain the corresponding CSI-RS resource indicator.

[0307] After receiving the measurement report from the UE, the network determines which TCI states are activated for the UE's downlink synchronization with the candidate cell or candidate Scell, and then sends an LTM candidate Scell ​​TCI stateactivation / deactivation MAC CE to the UE. In some embodiments, the LTM candidate Scell ​​TCI stateactivation / deactivation MAC CE may contain at least one of the following information: LTM Candidate ID, LTM Candidate SCell ID or LTM Candidate SCell index, P1-P8, D / U, and TCI state ID, etc.

[0308] After receiving the measurement report from the UE, the network determines whether the UE needs to perform an LTM handover, the corresponding target PCell and target SCell, and whether to activate the target SCell. If the network determines that the UE should perform an LTM handover to candidate cell 1 and activate candidate SCell 2, the network can send an LTM cell switch command MAC CE to the UE. The LTM cell switch command MAC CE received by the UE may contain at least one of the following information: target config id, LTM candidate id, PCell indication, target LTM candidate config id, TA, TCI ID, RACH resource information, and one or more LTM Candidate SCell IDs or indexes of SCells. Corresponding to each LTM Candidate SCell ID or index of SCell, the LTM cell switch command MAC CE may also contain at least one of the following information: TA of SCell, TCI state ID of SCell, etc. The UE performs an LTM handover based on the received LTM cell switch command MAC CE, switching to PCell 1 corresponding to the target ltm candidateconfig id, and simultaneously activating the SCell corresponding to the LTM Candidate SCell Id or index of SCell.

[0309] Implementation Method 4

[0310] This embodiment provides a method for configuring multiple LTM candidates with various possible CA combinations for a given candidate cell that can act as a PCell. For example, the first configuration is an LTM configuration, where the first, second, or third LTM candidate list can be an LTM candidate list, and the configuration of the first, second, or third LTM candidate cell can be an LTM candidate cell configuration.

[0311] Figure 6a An example diagram of candidate cell configuration is provided. Figure 6b An example diagram of another candidate cell configuration is provided. Figure 6c An example diagram of another candidate cell configuration is provided. Figure 6d An example diagram of another candidate cell configuration is provided. Figure 6e An example diagram of another candidate cell configuration is provided. Figure 6f An example diagram of another candidate cell configuration is provided. Figure 6g An example diagram of another candidate cell configuration is provided. Figure 6h An example diagram of another candidate cell configuration is provided. (e.g.) Figures 6a-6hAs shown, the candidate target base station has four cells (cell 1, cell 2, cell 3, and cell 4). When a UE accesses the candidate target base station, the candidate target base station may configure various different carrier aggregation (CA) combinations for the UE. Assuming that cell 1 can be configured as a PCell, the candidate target base station can configure eight different carrier aggregation configurations for the UE, as shown in Figure 6. For example, PCell with cell 1, PCell with cell 1 and SCell with cell 2, PCell with cell 1 and SCell with cell 3, PCell with cell 1 and SCell with cell 4, PCell with cell 1 and SCell with cell 2 / cell 3, PCell with cell 1 and SCell with cell 2 / cell 4, PCell with cell 1 and SCell with cell 3 / cell 4, and PCell with cell 1 and SCell with cell 2 / cell 3 / cell 4. These eight different carrier aggregation combinations correspond to eight different RRCReconfiguration messages. In the RRCReconfiguration messages generated by the candidate target base station corresponding to different carrier aggregations, the sCellState contained in SCellConfig is all configured as activated. The UE can receive multiple RRCReconfiguration messages from the source base station or source cell, containing various carrier aggregation combinations corresponding to a certain candidate PCell. The UE performs early ul sync, early dl sync, and L1 measurement reporting on the candidate PCell / candidate SCell. The source base station and source cell can select a suitable candidate PCell and SCell combination for the UE based on the L1 / L3 measurement results reported by the UE for the candidate PCell / candidate SCell, and issue the corresponding LTM cell switch command MAC CE to the UE for handover.

[0312] The UE receives the LTM configuration from the network. The LTM configuration includes an LTM candidate list. This LTM candidate list contains the configurations of one or more LTM candidate cells. The configuration of each LTM candidate cell includes one or more pieces of information such as LTM Candidate ID, candidatePCI, SSB configuration, CSI resource configuration, early UL synchronization configuration, TCI information, and UE measurement TA. Additionally, the LTM candidate cell configuration includes one or more RRC Reconfiguration pieces of information. The candidatePCI, SSB configuration, CSI resource configuration, early UL synchronization configuration, TCI information, and UE measurement TA configurations correspond to the candidate PCell (i.e., ...). Figures 6a-6h The configuration of cell 1) in the LTM candidate cell. The configuration of an LTM candidate cell contains one or more RRCReconfiguration entries that correspond to configurations of the same PCell but different SCell combinations. For example, an LTM candidate cell configuration can contain 8 RRCReconfiguration entries, all containing the same SpCellConfig configuration, while the SCell-related configurations correspond to... Figures 6a-6h Eight carrier aggregation scenarios.

[0313] The UE receives the configuration of the LTM candidate SCell from the network. The configuration of the LTM candidate SCell can be performed using at least one of the methods provided in embodiments 1-3 above. Assuming the method described above, which includes the candidate SCell configuration in the LTM candidate cell configuration corresponding to the PCell, the LTM candidate cell configuration further includes a candidate SCell list. For each SCell in the candidate SCell list, it may further include at least one of the following information: LTM Candidate SCell ID, candidatePCI, ssbconfig, CSI resource config, early UL synchronization configuration, TCI information, UE measurement TA, etc. In this embodiment, the candidate SCell list includes the relevant configurations for cell2, cell3, and cell4. The UE can perform early UL sync, early DL sync, and other processes on the candidate PCell and / or candidate SCell according to the configurations included in the LTM candidate list.

[0314] The LTM configuration received by the UE from the network may also include LTM CSI Resource Config and LTM CSI Report Config, which may contain resource and reporting configurations for candidate PCell and candidate SCell. The specific configuration method can adopt the method corresponding to Implementation Method 3. The UE measures the LTM candidate PCell and / or LTM candidate SCell according to the received LTM CSI resource configuration, and then reports the measurement results to the network according to the LTM reporting configuration. Furthermore, the network can also activate the TCI state of candidate Pcell or candidate Scell ​​using the method corresponding to Implementation Method 3.

[0315] After receiving the measurement report from the UE, the network determines whether to allow the UE to perform an LTM handover, specifying the corresponding target PCell and target SCell. If the network determines to allow the UE to perform an LTM handover... Figure 6eAs shown in the diagram, when the PCell and SCell combinations are configured, the network can send an LTM cell switch command MAC CE to the UE. The LTM cell switch command MAC CE received by the UE may contain at least one of the following information: target ltm candidate config id, TA, RRC config index, TCI ID, and RACH resource information. The RRC config index indicates the RRCReconfiguration message included in the LTM candidate cell configuration. Different RRC config indices correspond to different carrier aggregation combinations of RRCReconfiguration messages. If the RRCReconfiguration message pointed to by the RRC config index contains SCell configuration, the network can further send one or more of the following information to the UE via the MAC CE: LTM Candidate SCell Id or index of SCell, TA of SCell, TCI state ID of SCell, and RACH resource of SCell. Based on the received MAC CE, the UE performs an LTM handover, switching to PCell 1 corresponding to the target ltm candidate config id, and simultaneously activating Scell ​​2 and SCell 3 according to the RRCReconfiguration message.

[0316] In some embodiments, it is also possible to Figures 6a-6h The eight different RRCReconfigurations shown are placed in different LTM candidate cell configurations, which means that the LTM candidate list includes configurations for... Figures 6a-6h The various carrier aggregations shown may include LTM candidate cell configurations. Corresponding to this configuration, the network only needs to include one or more of the following information in the LTM cellswitch command MAC CE: target ltm candidate config id, TA, RRC configindex, TCI ID, RACH resource information, etc., without needing to include the RRC config index.

[0317] Implementation Method 5

[0318] This implementation focuses on the configuration of a candidate cell that can act as a PCell, encompassing all possible SCell aggregation configurations. The network then dynamically activates the SCell configuration based on the UE's measurement results. For example, the first configuration is an LTM configuration, where the first, second, or third LTM candidate list can be an LTM candidate list, and the configuration of the first, second, or third LTM candidate cell can be an LTM candidate cell configuration.

[0319] Figure 7a An example diagram of candidate cell configuration is provided. Figure 7b An example diagram of another candidate cell configuration is provided. Figure 7c An example diagram of another candidate cell configuration is provided. Figure 7d An example diagram of another candidate cell configuration is provided. (e.g.) Figures 7a-7d As shown, the candidate target base station has four cells (cell 1, cell 2, cell 3, and cell 4), all of which can function as either PCells or SCells. Considering that the candidate target base station is unaware of the channel conditions of the candidate SCells, it can configure all SCells as deactivated in the RRCReconfiguration message configured for the UE. Alternatively, the candidate target base station can select certain SCells based on the user's service requirements and the SCell load status, including these selected SCells in the RRCReconfiguration message configured for the UE, and configuring the status of these SCells as deactivated. Assume the candidate target base station configures the UE as follows... Figures 7a-7dThe diagram shows four different carrier aggregation combinations for candidate cell configurations. For example, PCell with cell 1 and SCell with cell2 / cell3 / cell4, PCell with cell2 and SCell with cell 1 / cell3 / cell4, PCell with cell3 and SCell with cell 1 / cell2 / cell4, and PCell with cell4 and SCell with cell 1 / cell2 / cell3. These four different carrier aggregation combinations correspond to four different RRCReconfiguration messages and different LTM candidate cell configurations. In the RRCReconfiguration messages generated by the candidate target base station corresponding to different PCells, the sCellState contained in SCellConfig is configured to be deactivated. The UE can receive an RRCReconfiguration message from the source base station or source cell containing all possible SCells corresponding to a certain candidate PCell. The UE performs early ul sync, early dl sync, and L1 measurement reporting on the candidate PCell / candidate SCell. The source base station and source cell can select a suitable candidate PCell and SCell combination for the UE based on the L1 / L3 measurement results reported by the UE for the candidate PCell / candidate SCell, and issue the corresponding LTM cell switch command MAC CE to allow the UE to switch and activate the SCell.

[0320] The UE receives the LTM configuration from the network. The LTM configuration includes an LTM candidate list. This LTM candidate list contains the configurations of one or more LTM candidate cells. The configuration of each LTM candidate cell includes one or more of the following: LTMCandidate Id, candidatePCI, SSB config, CSI resource config, early UL synchronization configuration, TCI information, UE measurement TA, and RRCReconfiguration information. The candidatePCI, SSB config, CSI resource config, early UL synchronization configuration, TCI information, and UE measurement TA correspond to the configuration of the candidate PCell. The RRCReconfiguration information included in the LTM candidate cell configuration corresponds to the configuration of the candidate PCell and the aggregated SCell. The SCell corresponding to the configuration of the aggregated SCell is in a deactivated state. For example, the LTM candidate list may contain the configurations of the four LTM candidate cells shown in Figure 7.

[0321] The LTM configuration received by the UE from the network may also include LTM CSI Resource Config and LTM CSI Report Config, which may contain resource and reporting configurations for candidate PCells and candidate SCells. The specific configuration method can adopt the method corresponding to Implementation Method 1. The UE measures the LTM candidate cells (e.g., candidate cell 1, cell 2, cell 3, and cell 4) according to the received LTM CSI resource configuration, and then reports the measurement results to the network according to the LTM reporting configuration.

[0322] After receiving the measurement report from the UE, the network determines whether to allow the UE to perform an LTM handover, the corresponding target PCell, and the target SCell to be activated. If the network determines to allow the UE to perform an LTM handover to PCell2 and simultaneously activate Scell ​​1, the network can send an LTM cell switch command MAC CE to the UE. The LTM cell switch command MAC CE received by the UE may contain at least one of the following information: target LTM candidate config id, TA, bitmap of activated SCell, activated Scell ​​index, TCI ID, RACH resource information, etc., or one or more of these. The bitmap of activated SCell may contain m bits, where n bits (e.g., the leftmost n bits or the rightmost n bits, m>=n) are used to indicate the SCell included in the RRCReconfiguration. The k-th bit in the bitmap indicates whether the SCell with SCell index k is activated. For example, if the k-th bit in the bitmap is set to "1", it corresponds to the activation of the SCell with SCell index k. If the LTM cell switch command MACCE contains an indication that an SCell is activated, the network can further send one or more of the following information to the UE via the MAC CE: TAof SCell, TCI state ID of SCell, RACH resource of SCell, etc. Based on the received MAC CE, the UE performs an LTM handover, switching to the PCell corresponding to the target LTM candidate config id, and simultaneously activating the corresponding SCell.

[0323] Implementation Method 6

[0324] This implementation provides different configurations within an LTM candidate cell configuration, including candidate cells as both PCells and Scells. The network then dynamically determines the configuration combination of PCells and activated SCells based on UE measurement results. For example, the first configuration is an LTM configuration, and the first, second, or third LTM candidate list can be LTM candidate lists. The configurations of the first, second, third, or fourth LTM candidate cells can be LTM candidate cell configurations.

[0325] To reduce RRC signaling overhead, the LTM candidate cell configuration received by the UE from the network includes different configurations of the candidate cell for PCell and Scell, and does not need to include the RRCReconfiguration message. The UE receives the LTM configuration from the network. The LTM configuration includes an LTM candidate list. The LTM candidate list contains the configurations of one or more LTM candidate cells. The LTM candidate cell configuration also includes any combination of the following information:

[0326] 1) RRC transaction id;

[0327] 2) LTM Candidate Id, candidatePCI, SSB config, CSI resource config, early UL synchronization configuration, TCI information, NoReset indication, securitychange indication, UE measurement TA;

[0328] 3) Non-cell-group specific configuration, such as air interface bearer configuration, measurement configuration, etc.;

[0329] 4)Cell-group specific configuration;

[0330] (1) SpCell specific configuration when the cell acts as a PCell;

[0331] (2) SCell-specific configuration when the cell acts as an SCell;

[0332] 5) Other common cell specific configurations.

[0333] In addition, the UE receives LTM CSI Resource Config and LTM CSI Report Config from the network, which may include the candidate cell's resources and reporting configuration. The UE measures the LTM candidate cell according to the received LTM CSI resource configuration and then reports the measurement results to the network according to the LTM reporting configuration. Furthermore, the UE can perform early DL synchronization and early UL synchronization on the candidate cell according to the received LTM candidate cell configuration. The network can also activate the TCI state corresponding to the candidate cell based on the UE's measurement reports.

[0334] After receiving the measurement report from the UE, the network determines whether to allow the UE to perform an LTM handover, the corresponding target PCell, and the target SCell to be activated. If the network determines to allow the UE to perform an LTM handover, with cell 1 as the PCell after the handover and cell 2 as the activated SCell, the network can send an LTM MAC CE to the UE. The LTM MAC CE received by the UE may contain one or more target LTM candidate config IDs. For each target LTM candidate config ID, the LTM MAC CE may further contain at least one of the following information: PCell or SCell indication, SCell index, SCell activate indication, TA, TCI ID, and RACH resource information. If the target LTM candidate config ID is associated with an SCell indication, the UE can also deduce the index of the corresponding SCell based on the order in which the target LTM candidate config IDs appear. In addition, the UE can also assume that the SCell associated with the target LTM candidate config ID contained in the LTM MAC CE is activated by default, without requiring an additional SCellactivate indication.

[0335] After receiving the LTM MAC CE, the UE can assemble the RRC configuration after the LTM handover based on the previously received LTM configuration. Figure 8 An example diagram illustrating the implementation of dynamically combining LTM candidate cell configurations is provided, such as... Figure 8As shown, the UE obtains the Non-cell-group specific configuration (e.g., air interface bearer configuration, measurement configuration, RRC transaction ID, etc.) from the LTM candidate cell configuration corresponding to cell 1, the SpCell specific configuration when the cell acts as a PCell, and other common cell specific configurations from the LTM candidate cell configuration corresponding to cell 2. Then, it obtains the SCell specific configuration when the cell acts as an SCell and other common cell specific configurations from the LTM candidate cell configuration corresponding to cell 2. This information can be assembled into a complete RRC configuration, which the UE can use after switching to cell 1. Finally, the UE sends an RRC reconfiguration complete message to cell 1, which includes at least one of the following: RRC transaction ID and LTM Candidate ID. The RRC transaction ID is obtained by the UE from the LTM candidate cell configuration. Figure 8 The information marked by dashed underlines is assembled from Pcell 1 into the RRC reconfiguration message. Furthermore, for carrier aggregation scenarios, the RRC reconfiguration completion message may contain multiple RRC transaction IDs and LTM CandidateIds corresponding to PCell and / or Scell ​​respectively.

[0336] Implementation Method 7

[0337] This implementation provides the reference configuration and delta configuration information for LTM candidate cells.

[0338] Based on implementation method 6, the UE can receive the LTM candidate cell reference configuration from the network. The LTM candidate cell reference configuration can be configured according to the configuration method given in implementation method 6, for example, including any combination of the following information:

[0339] 1) LTM Candidate Id, candidatePCI, SSB config, CSI resource config, early UL synchronization configuration, TCI information, NoReset indication, securitychange indication, UE measurement TA;

[0340] 2) Non-cell-group specific configuration, such as air interface bearer configuration, measurement configuration, etc.;

[0341] 3)Cell-group specific configuration;

[0342] (1) SpCell specific configuration when the cell acts as a PCell;

[0343] (2) SCell-specific configuration when the cell acts as an SCell;

[0344] 4) Other common cell specific configurations.

[0345] The configuration of one or more LTM candidate cells included in the LTM candidate list received by the UE from the network is a delta configuration based on the LTM candidate cell reference configuration. The delta configuration includes information that differs from the LTM candidate reference configuration; that is, the LTM candidate cell configuration only contains information (IE) that is different from the LTM candidate reference configuration, and information (IE) that is the same as the LTM candidate reference configuration does not need to be configured again. The LTM candidate reference configuration can be included in the first configuration.

[0346] After receiving the above configuration, the UE can deduce the complete configuration of each LTM candidate cell based on the LTM candidate reference configuration and the delta configuration of each LTM candidate cell.

[0347] Implementation Method 8

[0348] This implementation provides the design of validity information corresponding to the LTM candidate cell configuration.

[0349] Corresponding to the various methods for the UE to obtain LTM configuration from the network in the preceding embodiments, the LTM configuration obtained by the UE from the network may include validity information. Validity information may include at least one of the following: valid area, valid time. The valid time may be a valid time timer configuration. The valid area may include at least one of the following: one or more tracking areas, one or more cells, one or more base stations, or physical area range. Validity information may correspond to all LTM configurations, or it may correspond to a specific LTM candidate cell configuration, LTM candidate PCell configuration, LTM candidate SCell configuration, or LTM candidate cell reference configuration.

[0350] After receiving an LTM configuration containing valid information, the UE considers the validity period of the corresponding LTM configuration. If the valid LTM configuration information includes an LTM validity timer, the UE starts the LTM validity timer upon receiving the LTM configuration. The UE retains the corresponding LTM configuration until the LTM validity timer expires. Even when the UE switches from one base station to another, it can continue to use the valid LTM configuration for subsequent LTM handover. When the LTM validity timer expires, the UE discards the invalid LTM configuration. If the UE receives an updated LTM configuration from the network before the LTM configuration validity timer expires, the UE restarts the LTM validity timer.

[0351] If the valid information in the LTM configuration includes the valid areas of one or more cells, the UE, upon receiving the LTM configuration, determines whether it is currently within the valid area range of the LTM configuration. If the UE is within the coverage area of ​​the cell corresponding to the valid area, the UE can continue to use the corresponding LTM configuration; otherwise, the UE cannot use the LTM configuration that is not within the valid area range.

[0352] It is important to note that the UE can receive updated LTM configurations containing valid area information from the network. For example, for a configuration of valid areas associated with each LTM candidate cell configuration, if the UE receives a corresponding LTM candidate cell configuration containing updated valid area information, the UE will update the saved LTM candidate cell configuration and the corresponding valid area information.

[0353] It should be noted that the LTM cell switch command MAC CE in the above embodiments is one type of LTM cell handover command, and can also be implemented in other ways to achieve the same effect; this application does not limit this. The LTM candidate Scell ​​TCI state activation / deactivation MAC CE is one type of LTM candidate secondary cell TCI state information, and can also be implemented in other ways to achieve the same effect; this application does not limit this. The configurations and implementation methods in the above embodiments can be used in combination, and this application does not limit this. In the embodiments of this application, ltm and LTM have the same meaning and can be used interchangeably.

[0354] Figure 9 This is a schematic diagram of the structure of an information transmission device provided in one embodiment. The device is applied to a first communication node, such as... Figure 9 As shown, the device includes a first configuration receiving module 310 and a measurement reporting module 320.

[0355] The first configuration receiving module 310 is used to receive the first configuration of the mobile LTM triggered by layer 1 / layer 2, the first configuration including candidate secondary cell configuration;

[0356] The measurement reporting module 320 is used to measure the candidate secondary cells according to the first configuration and report the measurement results.

[0357] The information transmission apparatus provided in this application embodiment includes a first communication node receiving a first configuration of mobile LTM triggered by Layer 1 / Layer 2, the first configuration including candidate secondary cell configuration; measuring candidate secondary cells and reporting the measurement results according to the first configuration to configure secondary cells; the first communication node receiving the first configuration of LTM, the first configuration including candidate secondary cell configuration, the first communication node can measure candidate secondary cells based on the first configuration and report the measurement results; the first communication node can complete the measurement and reporting of secondary cells before LTM handover through the first configuration, avoiding a decrease in data transmission rate and improving user experience.

[0358] In some embodiments, the first configuration includes at least one of the following:

[0359] A first LTM candidate list, which includes the configuration of a first LTM candidate cell and / or the configuration of a secondary LTM candidate cell;

[0360] A second LTM candidate list and an LTM candidate secondary cell list, wherein the second LTM candidate list includes the configuration of a second LTM candidate cell, and the LTM candidate secondary cell list contains the configuration of one or more LTM candidate secondary cells;

[0361] The third LTM candidate list includes the configuration of third LTM candidate cells, and the configuration of the third LTM candidate cells includes the configuration of one or more LTM candidate secondary cells.

[0362] The fourth LTM candidate list includes the configuration of fourth LTM candidate cells, which includes the configuration of candidate cells as primary candidate cells and / or the configuration of candidate cells as secondary candidate cells.

[0363] In some embodiments, at least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, and the third LTM candidate cell includes at least one of the following:

[0364] One or more Radio Resource Control (RRC) reconfiguration messages, and a list of candidate secondary cells.

[0365] In some embodiments, an RRC reconfiguration message corresponds to a carrier aggregation combination, and each carrier aggregation combination includes the configuration of zero or one or more secondary cells.

[0366] In some embodiments, the plurality of RRC reconfiguration messages correspond to different secondary cell carrier aggregation combinations of the same primary cell.

[0367] In some embodiments, the secondary cell status contained in the one or more RRC reconfiguration messages is active; and / or, the secondary cell status contained in the one or more RRC reconfiguration messages is deactivated.

[0368] In some embodiments, at least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, the fourth LTM candidate cell, and the LTM secondary candidate cell includes at least one of the following:

[0369] LTM candidate identifier, LTM secondary cell candidate identifier, cell index, secondary cell index, candidate physical cell identifier (PCI), synchronization signal block configuration, channel state information reference signal (CSI-RS) resource configuration, early uplink synchronization configuration, transmission configuration indication (TCI) information, user equipment measurement timing advance indication, no reset indication, security change indication.

[0370] In some embodiments, the configuration of the fourth LTM candidate cell may further include at least one of the following: RRC transaction identifier, CSI resource configuration, non-cell group related configuration, cell group related configuration, and common cell related configuration.

[0371] In some embodiments, the candidate secondary cell list includes at least one secondary cell and information corresponding to each secondary cell;

[0372] The information corresponding to each secondary cell includes at least one of the following:

[0373] LTM secondary cell candidate identifier, LTM candidate identifier, secondary cell index, candidate PCI, synchronization signal block configuration, CSI-RS resource configuration, early uplink synchronization configuration, TCI information, user equipment measurement timing advance indication.

[0374] In some embodiments, the first configuration further includes: reference configuration information.

[0375] In some embodiments, at least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, the fourth LTM candidate cell, and the LTM candidate secondary cell includes differential configuration information that differs from the reference configuration information.

[0376] In some embodiments, the device further includes:

[0377] The complete configuration information generation module is used to determine the complete configuration information of LTM candidate cells and / or LTM candidate secondary cells based on the reference configuration information and the differential configuration information.

[0378] In some embodiments, the device further includes at least one of the following:

[0379] The first uplink synchronization module is used to perform early uplink synchronization of candidate cells according to at least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, and the fourth LTM candidate cell.

[0380] The first downlink synchronization module is used to perform early downlink synchronization of candidate cells according to at least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, and the fourth LTM candidate cell.

[0381] The second uplink synchronization module is used to perform early uplink synchronization of the candidate secondary cells according to the configuration of the LTM candidate secondary cells;

[0382] The second downlink synchronization module is used to perform early downlink synchronization of the candidate secondary cells according to the configuration of the LTM candidate secondary cells.

[0383] In some embodiments, the first configuration further includes at least one of the following:

[0384] LTM CSI resource configuration;

[0385] LTM candidate secondary cell CSI resource allocation.

[0386] CSI reporting configuration for LTM candidate cells;

[0387] CSI reporting configuration for LTM candidate secondary cells.

[0388] In some embodiments, the LTM CSI resource configuration includes at least one of the following:

[0389] LTM candidate secondary cell CSI resources, LTM candidate identifier, LTM secondary cell candidate identifier.

[0390] In some embodiments, the LTM CSI resource configuration includes at least one of the following:

[0391] LTM CSI resource configuration identifier, LTM synchronization signal block resource set, LTM synchronization signal block resource set of candidate secondary cell, LTM CSI-RS resource set, LTM CSI-RS resource set of candidate secondary cell.

[0392] In some embodiments, the LTM candidate secondary cell CSI resource configuration includes at least one of the following:

[0393] LTM secondary cell CSI resource configuration identifier, LTM synchronization signal block resource set of candidate secondary cell, LTM-CSI-RS resource set of candidate secondary cell.

[0394] In some embodiments, the LTM synchronization signal block resource set of the candidate secondary cell includes at least one of the following: LTM candidate identifier, LTM secondary cell candidate identifier, LTM candidate secondary cell identifier, LTM candidate secondary cell index, and synchronization signal block resource index;

[0395] In some embodiments, the LTM CSI-RS resource set of the candidate secondary cell includes at least one of the following: LTM candidate identifier, LTM secondary cell candidate identifier, LTM candidate secondary cell identifier, LTM candidate secondary cell index, and CSI-RS resource identifier.

[0396] In some embodiments, measuring the candidate secondary cells according to the first configuration includes at least one of the following:

[0397] Based on the received LTM CSI resource configuration, measurements are performed on the corresponding CSI resources;

[0398] Based on the received LTM candidate secondary cell CSI resource configuration, measurements are performed on the corresponding CSI resources.

[0399] In some embodiments, the CSI reporting configuration of the LTM candidate cell and / or the CSI reporting configuration of the LTM candidate secondary cell includes at least one of the following:

[0400] LTM CSI report configuration identifier, LTM CSI resource configuration identifier, LTM secondary cell CSI resource configuration identifier, report configuration type, report content.

[0401] In some embodiments, the LTM CSI report configuration identifier is associated with an LTM CSI resource configuration identifier; the apparatus further includes at least one of the following:

[0402] The first indexing module is used to sequentially index the synchronization signal block resources contained in multiple LTM synchronization signal block resource sets in ascending order when the LTM CSI resource configuration identifier is associated with multiple LTM synchronization signal block resource sets, so as to obtain the corresponding synchronization signal block resource indication.

[0403] The second indexing module is used to sequentially index the CSI-RS resources contained in multiple LTM CSI-RS resource sets in ascending order when the LTM CSI resource configuration identifier is associated with multiple LTM CSI-RS resource sets, so as to obtain the corresponding CSI-RS resource indication.

[0404] In some embodiments, the first configuration further includes: valid information.

[0405] In some embodiments, the valid information includes at least one of the following: valid area, valid time.

[0406] In some embodiments, the effective area includes at least one of the following: one or more tracking areas, one or more cells, one or more base stations, and physical area range.

[0407] In some embodiments, the valid information corresponds to at least one of the following: the configuration of the first LTM candidate cell, the configuration of the second LTM candidate cell, the configuration of the third LTM candidate cell, the configuration of the fourth LTM candidate cell, the configuration of the LTM secondary candidate cell, and reference configuration information.

[0408] In some embodiments, the device further includes:

[0409] The status information receiving module is used to receive LTM candidate secondary cell TCI status information, which is used to activate or deactivate the TCI status.

[0410] In some embodiments, the LTM candidate secondary cell TCI status information includes at least one of the following:

[0411] LTM candidate secondary cell identifier, LTM candidate secondary cell index, LTM candidate identifier, LTM secondary cell candidate identifier, P1-P8, uplink indicator, downlink indicator, TCI status identifier.

[0412] In some embodiments, the LTM candidate secondary cell TCI status information is indicated by reserved bits in the LTM candidate cell TCI status information.

[0413] In some embodiments, the measurement result includes at least one of the following:

[0414] Measurement results of LTM candidate secondary cells;

[0415] Measurement results of LTM candidate cells.

[0416] In some embodiments, the reported measurement results include at least one of the following:

[0417] LTM CSI report configuration identifier, candidate secondary cell indicator, candidate primary cell indicator, candidate secondary cell index, LTMCSI resource configuration identifier, LTM secondary cell CSI resource configuration identifier, synchronization signal block resource indicator, CSI-RS resource indicator, reference signal measurement value.

[0418] In some embodiments, the device further includes:

[0419] The handover command receiving module is used to receive LTM cell handover commands, execute LTM handover, and activate candidate secondary cells.

[0420] In some embodiments, the LTM cell handover command includes at least one of the following:

[0421] Target configuration identifier, LTM candidate identifier, primary cell indicator, primary cell advance timing command, TCI identifier, random access channel (RACH) resource.

[0422] In some embodiments, the LTM cell handover command includes at least one of the following:

[0423] The target configuration identifier of one or more secondary cells, one or more LTM secondary cell candidate identifiers, one or more LTM candidate secondary cell identifiers, one or more LTM candidate secondary cell indices, secondary cell activation bitmap, index of secondary cell to be activated, secondary cell advance timing command, advance timing command, TCI status identifier of secondary cell, RRC configuration index, RACH resource of secondary cell, secondary cell indicator, and secondary cell activation indicator.

[0424] In some embodiments, the device further includes:

[0425] The index determination module is used to determine the index of the secondary cell according to the order of the target configuration identifier of the secondary cell, the LTM secondary cell candidate identifier, or the LTM candidate secondary cell identifier.

[0426] In some embodiments, the device further includes:

[0427] The RRC configuration determination module is used to obtain configuration information from the configuration of the fourth LTM candidate cell and determine the RRC configuration.

[0428] In some embodiments, obtaining configuration information from the configuration of the fourth LTM candidate cell includes:

[0429] Determine the primary cell after the handover and the secondary cell that will be activated after the handover;

[0430] Obtain the relevant configuration of the primary cell from the configuration of the fourth LTM candidate cell corresponding to the primary cell after the handover;

[0431] Obtain the relevant configuration of the secondary cell from the configuration of the fourth LTM candidate cell corresponding to the secondary cell activated after the handover.

[0432] In some embodiments, performing an LTM handover includes: switching to a cell associated with a target configuration identifier;

[0433] In some embodiments, activating a secondary cell includes at least one of the following:

[0434] Activate the secondary cell corresponding to the target configuration identifier of the secondary cell;

[0435] Activate the LTM secondary cell candidate identifier of the secondary cell or the secondary cell corresponding to the LTM candidate secondary cell identifier;

[0436] The secondary cell corresponding to the LTM candidate secondary cell index of the activated secondary cell;

[0437] The RRC reconfiguration message associated with the activated target configuration identifier contains a secondary cell whose status is an activated secondary cell.

[0438] In some embodiments, the device further includes:

[0439] The reconfiguration completion message sending module is used to send an RRC reconfiguration completion message to the cell after handover;

[0440] The RRC reconfiguration completion message includes at least one of the following: RRC transaction identifier, LTM candidate identifier, LTM secondary cell candidate identifier, secondary cell identifier, and activated secondary cell index.

[0441] In some embodiments, if the validity period has not expired, the first configuration-related information is used for LTM switching; if the validity period has expired, the first configuration-related information is discarded.

[0442] In some embodiments, the device further includes:

[0443] The timing module is used to receive an updated first configuration if the valid time has not expired, and to restart the timing of the valid time.

[0444] In some embodiments, the first configuration-related information is available when the valid information includes a valid region and the first communication node is located within the valid region; and / or,

[0445] If the valid information contains a valid region and the first communication node is not within the valid region, the first configuration-related information is unavailable.

[0446] The information transmission device proposed in this embodiment belongs to the same inventive concept as the information transmission method proposed in the above embodiments. Technical details not described in detail in this embodiment can be found in any of the above embodiments. Furthermore, this embodiment has the same beneficial effects as performing the information transmission method.

[0447] Figure 10 This is a schematic diagram of another information transmission device provided in one embodiment, which is applied to a second communication node, such as... Figure 10 As shown, the device includes a first configuration sending module 410 and a measurement result receiving module 420.

[0448] The first configuration sending module 410 is used to send the first configuration of LTM, which includes the candidate secondary cell configuration.

[0449] The measurement result receiving module 420 is used to receive measurement results.

[0450] The information transmission device provided in this application embodiment allows a second communication node to send a first configuration of LTM, which includes a candidate secondary cell configuration. The first communication node can measure the candidate secondary cells and report the measurement results according to the first configuration to configure the secondary cells. The first communication node can complete the measurement and reporting of the secondary cells before LTM handover through the first configuration, thereby avoiding a decrease in data transmission rate and improving user experience.

[0451] In some embodiments, the first configuration includes at least one of the following:

[0452] The first LTM candidate list includes the configuration of the first LTM candidate cell and / or the configuration of the LTM candidate secondary cell;

[0453] The second LTM candidate list and the LTM candidate secondary cell list, the second LTM candidate list includes the configuration of the second LTM candidate cells, and the LTM candidate secondary cell list contains the configuration of one or more LTM candidate secondary cells;

[0454] The third LTM candidate list includes the configuration of the third LTM candidate cells, and the configuration of the third LTM candidate cells includes the configuration of one or more LTM candidate secondary cells.

[0455] The fourth LTM candidate list includes the configuration of the fourth LTM candidate cells, which includes the configuration of the candidate cells as primary candidate cells and / or the configuration of the candidate cells as secondary candidate cells.

[0456] In some embodiments, at least one of the configuration of the first LTM candidate cell, the configuration of the second LTM candidate cell, and the configuration of the third LTM candidate cell includes at least one of the following: one or more Radio Resource Control (RRC) reconfiguration messages, and a list of candidate secondary cells.

[0457] In some embodiments, an RRC reconfiguration message corresponds to a carrier aggregation combination, and each carrier aggregation combination includes the configuration of zero or one or more secondary cells.

[0458] In some embodiments, multiple RRC reconfiguration messages correspond to different secondary cell carrier aggregation combinations of the same primary cell.

[0459] In some embodiments, the secondary cell status contained in one or more RRC reconfiguration messages is active; and / or, the secondary cell status contained in one or more RRC reconfiguration messages is deactivated.

[0460] In some embodiments, at least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, the fourth LTM candidate cell, and the LTM secondary candidate cell includes at least one of the following:

[0461] LTM candidate identifier, LTM secondary cell candidate identifier, cell index, secondary cell index, candidate physical cell identifier (PCI), synchronization signal block configuration, channel state information reference signal (CSI-RS) resource configuration, early uplink synchronization configuration, transmission configuration indication (TCI) information, user equipment measurement timing advance indication, no reset indication, security change indication.

[0462] In some embodiments, the configuration of the fourth LTM candidate cell may further include at least one of the following: RRC transaction identifier, CSI resource configuration, non-cell group related configuration, cell group related configuration, and common cell related configuration.

[0463] In some embodiments, the candidate secondary cell list includes at least one secondary cell and information corresponding to each secondary cell;

[0464] Each secondary cell includes at least one of the following information:

[0465] LTM secondary cell candidate identifier, LTM candidate identifier, secondary cell index, candidate PCI, synchronization signal block configuration, CSI-RS resource configuration, early uplink synchronization configuration, TCI information, user equipment measurement timing advance indication.

[0466] In some embodiments, the first configuration further includes: reference configuration information.

[0467] In some embodiments, at least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, the fourth LTM candidate cell, and the LTM candidate secondary cell includes differential configuration information that differs from the reference configuration information.

[0468] In some embodiments, the first configuration further includes at least one of the following:

[0469] LTM CSI resource configuration;

[0470] LTM candidate secondary cell CSI resource allocation.

[0471] CSI reporting configuration for LTM candidate cells;

[0472] CSI reporting configuration for LTM candidate secondary cells.

[0473] In some embodiments, the LTM CSI resource configuration includes at least one of the following:

[0474] LTM candidate secondary cell CSI resources, LTM candidate identifier, LTM secondary cell candidate identifier.

[0475] In some embodiments, the LTM CSI resource configuration includes at least one of the following:

[0476] LTM CSI resource configuration identifier, LTM synchronization signal block resource set, LTM synchronization signal block resource set of candidate secondary cell, LTM CSI-RS resource set, LTM CSI-RS resource set of candidate secondary cell.

[0477] In some embodiments, the LTM candidate secondary cell CSI resource configuration includes at least one of the following:

[0478] LTM secondary cell CSI resource configuration identifier, LTM synchronization signal block resource set of candidate secondary cell, LTM-CSI-RS resource set of candidate secondary cell.

[0479] In some embodiments, the LTM synchronization signal block resource set of the candidate secondary cell includes at least one of the following: LTM candidate identifier, LTM secondary cell candidate identifier, LTM candidate secondary cell identifier, LTM candidate secondary cell index, and synchronization signal block resource index.

[0480] In some embodiments, the LTM CSI-RS resource set of a candidate secondary cell includes at least one of the following: LTM candidate identifier, LTM secondary cell candidate identifier, LTM candidate secondary cell identifier, LTM candidate secondary cell index, and CSI-RS resource identifier.

[0481] In some embodiments, the CSI reporting configuration of LTM candidate cells and / or the CSI reporting configuration of LTM candidate secondary cells includes at least one of the following:

[0482] LTM CSI report configuration identifier, LTM CSI resource configuration identifier, LTM secondary cell CSI resource configuration identifier, report configuration type, report content.

[0483] In some embodiments, the first configuration further includes: valid information.

[0484] In some embodiments, valid information includes at least one of the following: valid area, valid time.

[0485] In some embodiments, the effective area includes at least one of the following: one or more tracking areas, one or more cells, one or more base stations, and physical area range.

[0486] In some embodiments, the valid information corresponds to at least one of the following: the configuration of the first LTM candidate cell, the configuration of the second LTM candidate cell, the configuration of the third LTM candidate cell, the configuration of the fourth LTM candidate cell, the configuration of the LTM secondary candidate cell, and reference configuration information.

[0487] In some embodiments, the device further includes:

[0488] The status information sending module is used to send LTM candidate secondary cell TCI status information, which is used to activate or deactivate the TCI status.

[0489] In some embodiments, the LTM candidate secondary cell TCI status information includes at least one of the following:

[0490] LTM candidate secondary cell identifier, LTM candidate secondary cell index, LTM candidate identifier, LTM secondary cell candidate identifier, field containing the number of TCI states in the TCI code point, uplink indicator, downlink indicator, TCI state identifier.

[0491] In some embodiments, the LTM candidate secondary cell TCI status information is indicated by reserved bits in the LTM candidate cell TCI status information.

[0492] In some embodiments, the measurement result includes at least one of the following:

[0493] Measurement results of LTM candidate secondary cells;

[0494] Measurement results of LTM candidate cells.

[0495] In some embodiments, the reported measurement results include at least one of the following:

[0496] LTM CSI report configuration identifier, candidate secondary cell indicator, candidate primary cell indicator, candidate secondary cell index, LTMCSI resource configuration identifier, LTM secondary cell CSI resource configuration identifier, synchronization signal block resource indicator, CSI-RS resource indicator, reference signal measurement value.

[0497] In some embodiments, the device further includes:

[0498] The handover command sending module is used to send LTM cell handover commands.

[0499] In some embodiments, the LTM cell handover command includes at least one of the following:

[0500] Target configuration identifier, LTM candidate identifier, primary cell indicator, primary cell advance timing command, TCI identifier, random access channel (RACH) resource.

[0501] In some embodiments, the LTM cell handover command includes at least one of the following:

[0502] The target configuration identifier of one or more secondary cells, one or more LTM secondary cell candidate identifiers, one or more LTM candidate secondary cell identifiers, one or more LTM candidate secondary cell indices, secondary cell activation bitmap, index of secondary cell to be activated, secondary cell advance timing command, advance timing command, TCI status identifier of secondary cell, RRC configuration index, RACH resource of secondary cell, secondary cell indicator, and secondary cell activation indicator.

[0503] In some embodiments, if the validity period has not expired, the first configuration-related information is used for LTM switching; if the validity period expires, the first configuration-related information is discarded.

[0504] In some embodiments, the device further includes:

[0505] The first configuration update module is used to send updated first configurations.

[0506] In some embodiments, when the valid information includes a valid region and the first communication node is within the valid region, the first configuration-related information is available; and / or,

[0507] If the valid information contains a valid region but the first communication node is not within the valid region, the first configuration-related information is unavailable.

[0508] The information transmission device proposed in this embodiment belongs to the same inventive concept as the information transmission method proposed in the above embodiments. Technical details not described in detail in this embodiment can be found in any of the above embodiments. Furthermore, this embodiment has the same beneficial effects as performing the information transmission method.

[0509] This application also provides a communication node. Figure 11 A schematic diagram of the structure of a communication node is provided as an embodiment, such as... Figure 11 As shown, the communication node provided in this application includes a processor 510, a memory 520, and a computer program stored in the memory and executable on the processor. When the processor 510 executes the program, it implements the above-described information transmission method.

[0510] The communication node may also include a memory 520; the processor 510 in the communication node may be one or more. Figure 11 Taking a processor 510 as an example; the memory 520 is used to store one or more programs; the one or more programs are executed by the one or more processors 510, so that the one or more processors 510 implement the information transmission method as described in the embodiments of this application.

[0511] The communication node also includes: a communication device 530, an input device 540, and an output device 550.

[0512] The processor 510, memory 520, communication device 530, input device 540, and output device 550 in the communication node can be connected via a bus or other means. Figure 11 Taking bus connection as an example.

[0513] Input device 540 can be used to receive input digital or character information, and to generate key signal inputs related to user settings and function control of the communication node. Output device 550 may include display devices such as a display screen.

[0514] The communication device 530 may include a receiver and a transmitter. The communication device 530 is configured to perform information transmission and reception communication under the control of the processor 510.

[0515] The memory 520, as a computer-readable storage medium, can be configured to store software programs, computer-executable programs, and modules, such as program instructions / modules corresponding to the information transmission method described in the embodiments of this application (e.g., the first configuration receiving module 310 and measurement reporting module 320 in the information transmission device, or the first configuration sending module 410 and measurement result receiving module 420 in the information transmission device). The memory 520 may include a program storage area and a data storage area, wherein the program storage area may store the operating system and at least one application program required for a function; the data storage area may store data created according to the use of the communication node, etc. In addition, the memory 520 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 520 may further include memory remotely located relative to the processor 510, and these remote memories can be connected to the communication node via a network. Examples of the above-mentioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0516] This application also provides a storage medium storing a computer program, which, when executed by a processor, implements any of the information transmission methods described in this application.

[0517] Optionally, the information transmission method is applied to a first communication node and includes: receiving a first configuration of mobile LTM triggered by Layer 1 / Layer 2, the first configuration including candidate secondary cell configuration; measuring the candidate secondary cells according to the first configuration and reporting the measurement results.

[0518] Optionally, the information transmission method, applied to the second communication node, includes: sending a first configuration of LTM, the first configuration including candidate secondary cell configuration; and receiving measurement results.

[0519] The computer storage medium in this application embodiment can be any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. For example, a computer-readable storage medium can be, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable CD-ROM, optical storage device, magnetic storage device, or any suitable combination thereof. The computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0520] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-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. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit programs for use by or in connection with an instruction execution system, apparatus, or device.

[0521] Program code contained on a computer-readable medium may be transmitted using any suitable medium, including but not limited to: wireless, wire, optical fiber, radio frequency (RF), etc., or any suitable combination thereof.

[0522] This application provides a computer program product, which includes a computer program that, when executed by a processor, implements the information transmission method described in any one of the embodiments of this application.

[0523] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer 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 computer (e.g., via the Internet using an Internet service provider).

[0524] The above description is merely an exemplary embodiment of this application and is not intended to limit the scope of protection of this application.

[0525] Those skilled in the art will understand that the term user terminal encompasses any suitable type of wireless user equipment, such as mobile phones, portable data processing devices, portable web browsers, or vehicle-mounted mobile stations.

[0526] Generally, the various embodiments of this application can be implemented in hardware or dedicated circuitry, software, logic, or any combination thereof. For example, some aspects can be implemented in hardware, while others can be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device, although this application is not limited thereto.

[0527] Embodiments of this application can be implemented by executing computer program instructions through the data processor of a mobile device, for example, in a processor entity, or through hardware, or through a combination of software and hardware. The computer program instructions can be assembly instructions, Instruction Set Architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages.

[0528] Any block diagram of logical flow in the accompanying drawings of this application may represent program steps, or may represent interconnected logic circuits, modules, and functions, or may represent a combination of program steps and logic circuits, modules, and functions. The computer program may be stored on memory. The memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as, but not limited to, read-only memory (ROM), random access memory (RAM), optical storage devices and systems (Digital Video Disc (DVD) or Compact Disk (CD), etc.). Computer-readable media may include non-transitory storage media. The data processor may be of any type suitable to the local technical environment, such as, but not limited to, general-purpose computers, special-purpose computers, microprocessors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), and processors based on multi-core processor architectures.

[0529] A detailed description of exemplary embodiments of this application has been provided above through exemplary and non-limiting examples. However, various modifications and adjustments to the above embodiments will be apparent to those skilled in the art when considered in conjunction with the accompanying drawings and claims, without departing from the scope of this application. Therefore, the proper scope of this application will be determined by the claims.

Claims

1. An information transmission method, characterized in that, Applied to the first communication node, including: The first configuration of mobile LTM triggered by layer 1 / layer 2, the first configuration including candidate secondary cell configuration; The candidate secondary cells are measured according to the first configuration, and the measurement results are reported.

2. The information transmission method according to claim 1, characterized in that, The first configuration includes at least one of the following: A first LTM candidate list, which includes the configuration of a first LTM candidate cell and / or the configuration of a secondary LTM candidate cell; A second LTM candidate list and an LTM candidate secondary cell list, wherein the second LTM candidate list includes the configuration of a second LTM candidate cell, and the LTM candidate secondary cell list contains the configuration of one or more LTM candidate secondary cells; The third LTM candidate list includes the configuration of third LTM candidate cells, and the configuration of the third LTM candidate cells includes the configuration of one or more LTM candidate secondary cells. The fourth LTM candidate list includes the configuration of fourth LTM candidate cells, which includes the configuration of candidate cells as primary candidate cells and / or the configuration of candidate cells as secondary candidate cells.

3. The information transmission method according to claim 2, characterized in that, The configuration of the first LTM candidate cell, the configuration of the second LTM candidate cell, and the configuration of the third LTM candidate cell include at least one of the following: One or more Radio Resource Control (RRC) reconfiguration messages, and a list of candidate secondary cells.

4. The information transmission method according to claim 3, characterized in that, One RRC reconfiguration message corresponds to one carrier aggregation combination, and each carrier aggregation combination includes the configuration of zero or one or more secondary cells; The multiple RRC reconfiguration messages correspond to different secondary cell carrier aggregation combinations of the same primary cell.

5. The information transmission method according to claim 3, characterized in that, The secondary cell status contained in one or more RRC reconfiguration messages is active; and / or, The secondary cell status contained in one or more RRC reconfiguration messages is deactivated.

6. The information transmission method according to claim 2, characterized in that, The configuration of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, the fourth LTM candidate cell, and the LTM secondary candidate cell includes at least one of the following: LTM candidate identifier, LTM secondary cell candidate identifier, cell index, secondary cell index, candidate physical cell identifier (PCI), synchronization signal block configuration, channel state information reference signal (CSI-RS) resource configuration, early uplink synchronization configuration, transmission configuration indication (TCI) information, user equipment measurement timing advance indication, no reset indication, security change indication.

7. The information transmission method according to claim 6, characterized in that, The configuration of the fourth LTM candidate cell also includes at least one of the following: RRC transaction identifier, CSI resource configuration, non-cell group related configuration, cell group related configuration, and public cell related configuration.

8. The information transmission method according to claim 3, characterized in that, The candidate secondary cell list includes at least one secondary cell and information corresponding to each secondary cell; The information corresponding to each secondary cell includes at least one of the following: LTM secondary cell candidate identifier, LTM candidate identifier, secondary cell index, candidate PCI, synchronization signal block configuration, CSI-RS resource configuration, early uplink synchronization configuration, TCI information, user equipment measurement timing advance indication.

9. The information transmission method according to claim 2, characterized in that, The first configuration also includes: reference configuration information.

10. The information transmission method according to claim 9, characterized in that, At least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, the fourth LTM candidate cell, and the LTM candidate secondary cell includes differential configuration information that differs from the reference configuration information.

11. The information transmission method according to claim 10, characterized in that, Also includes: The complete configuration information of LTM candidate cells and / or LTM candidate secondary cells is determined based on the reference configuration information and the differential configuration information.

12. The information transmission method according to claim 2, characterized in that, It also includes at least one of the following: Early uplink synchronization is performed on candidate cells based on at least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, and the fourth LTM candidate cell. Early downlink synchronization is performed on candidate cells based on at least one of the configurations of the first LTM candidate cell, the second LTM candidate cell, the third LTM candidate cell, and the fourth LTM candidate cell. Early uplink synchronization is performed on the candidate secondary cells according to the configuration of the LTM candidate secondary cells; Early downlink synchronization is performed on the candidate secondary cells according to the configuration of the LTM candidate secondary cells.

13. The information transmission method according to claim 1, characterized in that, The first configuration also includes at least one of the following: LTM CSI resource configuration; LTM candidate secondary cell CSI resource allocation; CSI reporting configuration for LTM candidate cells; CSI reporting configuration for LTM candidate secondary cells.

14. The information transmission method according to claim 13, characterized in that, The LTM CSI resource configuration includes at least one of the following: LTM candidate secondary cell CSI resources, LTM candidate identifier, LTM secondary cell candidate identifier.

15. The information transmission method according to claim 13, characterized in that, The LTM CSI resource configuration includes at least one of the following: LTM CSI resource configuration identifier, LTM synchronization signal block resource set, LTM synchronization signal block resource set of candidate secondary cell, LTM CSI-RS resource set, LTM CSI-RS resource set of candidate secondary cell.

16. The information transmission method according to claim 13, characterized in that, The LTM candidate secondary cell CSI resource configuration includes at least one of the following: LTM secondary cell CSI resource configuration identifier, LTM synchronization signal block resource set of candidate secondary cells, and LTMCSI-RS resource set of candidate secondary cells.

17. The information transmission method according to claim 15 or 16, characterized in that, The LTM synchronization signal block resource set of the candidate secondary cell includes at least one of the following: LTM candidate identifier, LTM secondary cell candidate identifier, LTM candidate secondary cell identifier, LTM candidate secondary cell index, and synchronization signal block resource index. The LTM CSI-RS resource set of the candidate secondary cell includes at least one of the following: LTM candidate identifier, LTM secondary cell candidate identifier, LTM candidate secondary cell identifier, LTM candidate secondary cell index, and CSI-RS resource identifier.

18. The information transmission method according to claim 1, characterized in that, The measurement of candidate secondary cells according to the first configuration includes at least one of the following: Based on the received LTM CSI resource configuration, perform measurements on the corresponding CSI resources; Based on the received LTM candidate secondary cell CSI resource configuration, measurements are performed on the corresponding CSI resources.

19. The information transmission method according to claim 13, characterized in that, The CSI reporting configuration of the LTM candidate cell and / or the CSI reporting configuration of the LTM candidate secondary cell includes at least one of the following: LTM CSI report configuration identifier, LTM CSI resource configuration identifier, LTM secondary cell CSI resource configuration identifier, report configuration type, report content.

20. The information transmission method according to claim 19, characterized in that, The LTM CSI report configuration identifier is associated with the LTM CSI resource configuration identifier; the method further includes at least one of the following: When an LTM CSI resource configuration identifier is associated with multiple LTM synchronization signal block resource sets, the synchronization signal block resources contained in the multiple LTM synchronization signal block resource sets are sequentially indexed in ascending order to obtain the corresponding synchronization signal block resource indication. When an LTM CSI resource configuration identifier is associated with multiple LTM CSI-RS resource sets, the CSI-RS resources contained in the multiple LTM CSI-RS resource sets are sequentially indexed in ascending order to obtain the corresponding CSI-RS resource indication.

21. The information transmission method according to claim 1, characterized in that, The first configuration also includes: valid information.

22. The information transmission method according to claim 21, characterized in that, The valid information includes at least one of the following: valid area, valid time.

23. The information transmission method according to claim 22, characterized in that, The effective area includes at least one of the following: one or more tracking areas, one or more cells, one or more base stations, and physical area range.

24. The information transmission method according to claim 21, characterized in that, The valid information corresponds to at least one of the following: the configuration of the first LTM candidate cell, the configuration of the second LTM candidate cell, the configuration of the third LTM candidate cell, the configuration of the fourth LTM candidate cell, the configuration of the LTM secondary candidate cell, and reference configuration information.

25. The information transmission method according to claim 1, characterized in that, Also includes: Receive LTM candidate secondary cell TCI status information, which is used to activate or deactivate the TCI status.

26. The information transmission method according to claim 25, characterized in that, The LTM candidate secondary cell TCI status information includes at least one of the following: LTM candidate secondary cell identifier, LTM candidate secondary cell index, LTM candidate identifier, LTM secondary cell candidate identifier, field containing the number of TCI states in the TCI code point, uplink indicator, downlink indicator, TCI state identifier.

27. The information transmission method according to claim 25, characterized in that, The LTM candidate secondary cell TCI status information is indicated by the reserved bits in the LTM candidate cell TCI status information.

28. The information transmission method according to claim 1, characterized in that, The measurement results include at least one of the following: Measurement results of LTM candidate secondary cells; Measurement results of LTM candidate cells.

29. The information transmission method according to claim 1, characterized in that, The reported measurement results should include at least one of the following: LTM CSI report configuration identifier, candidate secondary cell indicator, candidate primary cell indicator, candidate secondary cell index, LTM CSI resource configuration identifier, LTM secondary cell CSI resource configuration identifier, synchronization signal block resource indicator, CSI-RS resource indicator, reference signal measurement value.

30. The information transmission method according to claim 1, characterized in that, Also includes: Receive LTM cell handover command, execute LTM handover and activate candidate secondary cells.

31. The information transmission method according to claim 30, characterized in that, The LTM cell handover command includes at least one of the following: Target configuration identifier, LTM candidate identifier, primary cell indicator, primary cell advance timing command, TCI identifier, random access channel (RACH) resource.

32. The information transmission method according to claim 30, characterized in that, The LTM cell handover command includes at least one of the following: The target configuration identifier of one or more secondary cells, one or more LTM secondary cell candidate identifiers, one or more LTM candidate secondary cell identifiers, one or more LTM candidate secondary cell indices, secondary cell activation bitmap, index of secondary cell to be activated, secondary cell advance timing command, advance timing command, TCI status identifier of secondary cell, RRC configuration index, RACH resource of secondary cell, secondary cell indicator, and secondary cell activation indicator.

33. The information transmission method according to claim 32, characterized in that, Also includes: The index of the secondary cell is determined according to the order of the target configuration identifier, LTM secondary cell candidate identifier, or LTM candidate secondary cell identifier of the secondary cell.

34. The information transmission method according to claim 2, characterized in that, Also includes: The configuration information is obtained from the configuration of the fourth LTM candidate cell to determine the RRC configuration.

35. The information transmission method according to claim 34, characterized in that, The step of obtaining configuration information from the configuration of the fourth LTM candidate cell includes: Determine the primary cell after the handover and the secondary cell that will be activated after the handover; Obtain the relevant configuration of the primary cell from the configuration of the fourth LTM candidate cell corresponding to the primary cell after the handover; Obtain the relevant configuration of the secondary cell from the configuration of the fourth LTM candidate cell corresponding to the secondary cell activated after the handover.

36. The information transmission method according to claim 30, characterized in that, The LTM handover includes: switching to the cell associated with the target configuration identifier; Activating a secondary cell includes at least one of the following: Activate the secondary cell corresponding to the target configuration identifier of the secondary cell; Activate the LTM secondary cell candidate identifier of the secondary cell or the secondary cell corresponding to the LTM candidate secondary cell identifier; The secondary cell corresponding to the LTM candidate secondary cell index of the activated secondary cell; The RRC reconfiguration message associated with the activated target configuration identifier contains a secondary cell whose status is an activated secondary cell.

37. The information transmission method according to claim 30, characterized in that, Also includes: Send an RRC reconfiguration complete message to the cell after handover; The RRC reconfiguration completion message includes at least one of the following: RRC transaction identifier, LTM candidate identifier, LTM secondary cell candidate identifier, secondary cell identifier, and activated secondary cell index.

38. The information transmission method according to claim 22, characterized in that, If the effective time has not expired, the first configuration-related information is used for LTM switching; if the effective time has expired, the first configuration-related information is discarded.

39. The information transmission method according to claim 22, characterized in that, Also includes: If the updated first configuration is received before the validity period expires, the validity period is restarted.

40. The information transmission method according to claim 22, characterized in that, The first configuration-related information is available when the valid information contains a valid region and the first communication node is located within the valid region. And / or, If the valid information contains a valid region and the first communication node is not within the valid region, the first configuration-related information is unavailable.

41. An information transmission method, characterized in that, Applied to the second communication node, including: Send the first configuration of LTM, which includes candidate secondary cell configuration; Receive measurement results.

42. A communication node, characterized in that, include: The program includes a memory, a processor, a program stored in the memory and executable on the processor, and a data bus for establishing communication between the processor and the memory, wherein the program, when executed by the processor, implements the steps of the information transmission method as described in any one of claims 1-41.

43. A storage medium for computer-readable storage, characterized in that, The storage medium stores one or more programs, which can be executed by one or more processors to implement the steps of the information transmission method according to any one of claims 1-41.

44. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the information transmission method according to any one of claims 1-41.

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