Candidate cell determination method, network node and communication system

Abstract

The invention provides a candidate cell determination method, a network node and a communication system, and relates to the field of wireless communication. The method comprises: a first network node sending a first signaling to a second network node, the first signaling comprising at least one of the following information: first LTM indication information indicating that the current first signaling is an LTM request; a candidate cell identity or index; a maximum allowable number of candidate cells; reference configuration; wherein the LTM represents the mobility triggered by the first layer or the second layer; and the first network node receives a second signaling fed back by the second network node, wherein the second signaling comprises the candidate cell identifier or index accepting the LTM request. Network nodes interact LTM configuration and candidate cell related information among Xn interfaces, so that a network is helped to screen out a more appropriate candidate cell set, and the reliability of an LTM mechanism is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of wireless communications, and in particular to a candidate cell determination method, a network node, and a communication system. Background Art

[0002] In some related technologies, the serving cell switching is based on Layer 3 (L3) measurement and triggered by RRC (Radio Resource Control) signaling. The terminal needs to perform a complete cell reconfiguration and Layer 1 (L1) / Layer 2 (L2) reconstruction process, which will result in a large switching delay and signaling overhead. L1 refers to Layer 1, i.e., the physical layer; L2 refers to Layer 2, i.e., the MAC (Medium Access Control) layer; and L3 refers to Layer 3, i.e., the RRC layer.

[0003] In other related technologies, the LTM (L1 / L2 Triggered Mobility) mechanism triggers the switching of the serving cell through L1 / L2 signaling to achieve the goals of low latency, low overhead and low data interruption time.

[0004] In the LTM mechanism, based on the set of candidate cells pre-configured by the network, the terminal performs L1 measurement and reports the measurement results. The network then triggers the switching of the serving cell through L1 / L2 signaling. Therefore, the selection and configuration of candidate cells are very important for the performance of LTM. Summary of the invention

[0005] In the disclosed embodiment, the network nodes can exchange LTM configuration and candidate cell related information between Xn interfaces, which can help the network screen out a more suitable candidate cell set and improve the reliability of the LTM mechanism.

[0006] Some embodiments of the present disclosure propose a candidate cell determination method, comprising: a first network node sends a first signaling to a second network node, the first signaling including at least one of the following information: a first LTM indication information, indicating that the current first signaling is an LTM request; a candidate cell identifier or index; a maximum allowed number of candidate cells; a reference configuration; wherein LTM represents layer one or layer two triggered mobility; the first network node receives a second signaling fed back by the second network node, the second signaling including a candidate cell identifier or index that accepts the LTM request.

[0007] In some embodiments, the second signaling includes one or more of the following information for each candidate cell identifier or index that accepts the LTM request: random access related configuration information; reference signal resource configuration; maximum time for reserving resources for the terminal; and advance data forwarding acceptance level indication information.

[0008] In some embodiments, the second signaling further includes an incremental configuration, and the incremental configuration is generated based on a reference configuration carried in the first signaling.

[0009] In some embodiments, it also includes: the first network node sends a third signaling to the second network node, and the third signaling includes at least one of the following information: second LTM indication information, indicating that the current third signaling is an LTM modification request; the candidate cell identifier or index requested to be modified; the first network node receives a fourth signaling fed back by the second network node, and the fourth signaling includes the modified candidate cell identifier or index.

[0010] In some embodiments, the fourth signaling includes one or more of the following information for each candidate cell identifier or index requested to be modified: random access related configuration information; reference signal resource configuration; maximum time for reserving resources for the terminal; and advance data forwarding acceptance level indication information.

[0011] In some embodiments, the random access-related configuration information includes preamble code related configuration information, and / or random access response RAR related configuration information; the preamble code related configuration information includes one or more of the following information: root sequence index required to generate the preamble code; time-frequency resource location information for sending the preamble code; time information for sending the preamble code; retransmission configuration information of the preamble code; the RAR-related configuration information includes one or more of the following information: whether there is a RAR message indication information; RAR source indication information, used to indicate whether the terminal receives the RAR from the source cell or the candidate cell; RAR detection window time length.

[0012] In some embodiments, the retransmission configuration information of the preamble code includes one or more of the following information: whether to retransmit; the maximum number of retransmissions; the initial transmission power; and the power ramp-up strategy.

[0013] In some embodiments, the reference signal resource configuration includes one or more of the following information: CSI-RS resource configuration; SSB resource configuration.

[0014] In some embodiments, in a switching scenario, the first network node is a source base station, the second network node is a candidate target base station, the first signaling is a switching request signaling, the second signaling is a switching request response signaling, the third signaling is a switching request signaling, and the fourth signaling is a switching request response signaling.

[0015] In some embodiments, in a dual-connection scenario where a primary node triggers the addition or change of a secondary node, the first network node is a primary node, the second network node is a candidate target secondary node, the first signaling is a secondary node addition request signaling, the second signaling is a secondary node addition feedback signaling, the third signaling is a secondary node change request signaling, and the fourth node is a secondary node change request feedback signaling.

[0016] In some embodiments, in a dual-connection scenario where a secondary node is added or changed and triggered by a secondary node, the first network node is a primary node, the second network node is a secondary node, the first signaling is a secondary node addition request signaling, the second signaling is a secondary node addition request feedback signaling, the third signaling is a secondary node change request signaling, and the fourth node is a secondary node change request feedback signaling.

[0017] In some embodiments, one or more of the following steps are also included:

[0018] Before sending the first signaling, the first network node receives a fifth signaling sent by the second network node, wherein the fifth signaling includes at least one of the following information: first LTM indication information, indicating that the current fifth signaling is an LTM request; a candidate cell identifier or index; a maximum allowed number of candidate cells; a reference configuration;

[0019] After receiving the second signaling, the first network node sends a sixth signaling to the second network node, where the sixth signaling includes an identifier or index of a candidate cell accepting the LTM request;

[0020] Before sending the third signaling, the first network node receives a seventh signaling sent by the second network node, where the seventh signaling includes at least one of the following information: second LTM indication information indicating that the current seventh signaling is an LTM modification request; an identifier or index of a candidate cell requested to be modified;

[0021] After receiving the fourth signaling, the first network node sends an eighth signaling to the second network node, where the eighth signaling includes a modified candidate cell identifier or index.

[0022] Some embodiments of the present disclosure provide a method for determining a candidate cell, including:

[0023] The second network node receives a first signaling sent by the first network node, wherein the first signaling includes at least one of the following information: first LTM indication information, indicating that the current first signaling is an LTM request; a candidate cell identifier or index; a maximum allowed number of candidate cells; a reference configuration; wherein LTM indicates mobility triggered by layer 1 or layer 2;

[0024] The second network node sends a second signaling to the first network node, where the second signaling includes an identifier or index of a candidate cell for accepting the LTM request.

[0025] In some embodiments, the second signaling includes one or more of the following information for each candidate cell identifier or index that accepts the LTM request: random access related configuration information; reference signal resource configuration; maximum time for reserving resources for the terminal; and advance data forwarding acceptance level indication information.

[0026] In some embodiments, the second signaling further includes an incremental configuration, and the incremental configuration is generated based on a reference configuration carried in the first signaling.

[0027] In some embodiments, it also includes:

[0028] The second network node receives a third signaling sent by the first network node, where the third signaling includes at least one of the following information: second LTM indication information, indicating that the current third signaling is an LTM modification request; an identifier or index of a candidate cell requested to be modified;

[0029] The second network node sends a fourth signaling to the first network node, where the fourth signaling includes a modified candidate cell identifier or index.

[0030] In some embodiments, the fourth signaling includes one or more of the following information for each candidate cell identifier or index requested to be modified: random access related configuration information; reference signal resource configuration; maximum time for reserving resources for the terminal; and advance data forwarding acceptance level indication information.

[0031] In some embodiments, the random access-related configuration information includes preamble code related configuration information and / or random access response RAR related configuration information, and the preamble code related configuration information includes one or more of the following information: root sequence index required to generate the preamble code; time-frequency resource location information for sending the preamble code; time information for sending the preamble code; retransmission configuration information of the preamble code; the RAR-related configuration information includes one or more of the following information: whether there is a RAR message indication information; RAR source indication information, used to indicate whether the terminal receives the RAR from the source cell or from the candidate cell; RAR detection window time length.

[0032] In some embodiments, the retransmission configuration information of the preamble code includes one or more of the following information: whether to retransmit; the maximum number of retransmissions; the initial transmission power; and the power ramp-up strategy.

[0033] In some embodiments, the reference signal resource configuration includes one or more of the following information: CSI-RS resource configuration; SSB resource configuration.

[0034] Some embodiments of the present disclosure provide a network node, including: a memory; and a processor coupled to the memory, wherein the processor is configured to execute a candidate cell determination method based on instructions stored in the memory.

[0035] Some embodiments of the present disclosure provide a network node, including: a module for executing a candidate cell determination method.

[0036] Some embodiments of the present disclosure provide a communication system, including:

[0037] a first network node configured to execute a candidate cell determination method performed by a first network node; and

[0038] The second network node is configured to execute the candidate cell determination method performed by the second network node.

[0039] Some embodiments of the present disclosure provide a computer-readable storage medium having a computer program stored thereon, which implements the steps of the candidate cell determination method when the program is executed by a processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. The present disclosure can be more clearly understood according to the following detailed description with reference to the drawings.

[0041] Obviously, the drawings described below are only some embodiments of the present disclosure, and a person skilled in the art can obtain other drawings based on these drawings without creative work.

[0042] Figure 1 A schematic diagram showing a flow chart of a method for determining a candidate cell according to some embodiments of the present disclosure.

[0043] Figure 2 A schematic diagram showing the application of the candidate cell determination method according to some embodiments of the present disclosure to a handover scenario.

[0044] Figure 3 A schematic diagram showing the application of the candidate cell determination method of some embodiments of the present disclosure to a scenario where a secondary node is added or changed and triggered by a primary node in a dual-connection scenario.

[0045] Figure 4 A schematic diagram showing the application of the candidate cell determination method of some embodiments of the present disclosure to a secondary node adding scenario triggered by a secondary node in a dual-connection scenario.

[0046] Figure 5 A schematic diagram showing the application of the candidate cell determination method of some embodiments of the present disclosure to a secondary node change scenario triggered by a secondary node in a dual connectivity scenario.

[0047] Figure 6 A schematic diagram showing a network node according to some embodiments of the present disclosure.

[0048] Figure 7 A schematic diagram showing a communication system according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0049] Exemplary embodiments of the present disclosure will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the embodiments are described in the specification. However, it should be understood that many implementation-specific settings must be made in the process of implementing the embodiments in order to achieve the specific goals of the developer, for example, to meet those restrictions related to the device and the service, and these restrictions may vary depending on the implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this disclosure.

[0050] It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

[0051] Those skilled in the art can understand that the terms "first" and "second" in the embodiments of the present disclosure are only used to distinguish different steps, devices or modules, etc., and neither represent any specific technical meaning nor indicate the necessary logical order between them.

[0052] It should also be understood that in the embodiments of the present disclosure, “plurality” may refer to two or more than two, and “at least one” may refer to one, two, or more than two.

[0053] It should also be understood that any component, data or structure mentioned in the embodiments of the present disclosure can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0054] The terms in the embodiments of the present disclosure are explained below.

[0055] MCG: Master Cell group, main cell group;

[0056] SCG: Secondary Cell group, secondary cell group;

[0057] MCG and SCG are concepts under dual connectivity (DC), in which the group (Group) of the cell (Cell) to which the terminal first initiates random access is located is the MCG.

[0058] PCell: Primary Cell, primary cell;

[0059] SCell: Secondary Cell, secondary cell;

[0060] PSCell: Primary Secondary Cell, primary and secondary cell;

[0061] Under MCG, there may be many cells, one of which is used to initiate initial access. This cell is called PCell (Primary Cell). As the name suggests, PCell is the most "main" cell in MCG. PCell under MCG and SCell (Secondary Cell) under MCG are combined through carrier aggregation (CA) technology.

[0062] There is also a primary cell under SCG, which is PSCell (Primary Secondary Cell), which can be understood as the cell that initiates initial access under SCG. PSCell under SCG and SCell under SCG are combined through CA technology.

[0063] In MR-DC (Multi-Radio Access Technology Dual Connectivity), DC is the working mode in which the terminal is connected to two base stations, and MR refers to multiple RATs (Radio Access Technology). For example, in one MR-DC technology, the terminal is connected to an eNB (4G base station) and a gNB (5G base station) respectively.

[0064] In MR-DC, a base station node whose control plane is directly connected to the core network is called a MN (Master Node), and a base station node whose control plane is not directly connected to the core network is called a SN (Secondary Node).

[0065] According to the different situations of the two base stations connected to the terminal, MR-DC includes multiple specific modes such as EN-DC, NE-DC, and NR-DC. EN-DC, namely LTE-NRDC, the LTE (Long Term Evolution) base station is the primary node, and the 5G NR (NewRadio) base station is the secondary node. NE-DC, namely NR-LTE DC, the NR base station is the primary node, and the LTE base station is the secondary node. NR-DC, namely NR-NR DC, both the primary node and the secondary node are NR base stations. SgNB represents the secondary node in EN-DC, and SN represents the secondary node in NE-DC or NR-DC.

[0066] In the disclosed embodiment, the network nodes can exchange LTM configuration and candidate cell related information between Xn interfaces, which can help the network screen out a more suitable candidate cell set and improve the reliability of the LTM mechanism.

[0067] The network node is, for example, a RAN (Radio Access Network) node, and the RAN node includes, for example, but is not limited to, an NG (Next generation)-RAN node. The RAN node is, for example, a base station. The base station includes a base station with a separated architecture and a base station with a non-separated architecture. The base station with a separated architecture includes a CU (Centralized Unit) and a DU (Distributed Unit).

[0068] The Xn signaling interaction process between base stations is designed so that NG-RAN nodes can implement the LTM mechanism in different CU (inter-CU) scenarios, thereby effectively reducing the data interruption time of terminals in mobility scenarios. This disclosure focuses on the LTM preparation stage, and designs new auxiliary information around the selection and update of candidate cells to help network nodes screen out a more reasonable set of LTM candidate cells, and support the source network node to modify the candidate cell configuration when necessary, making the application of LTM more flexible and reliable. The specific process and auxiliary information are as follows: Figure 1 shown.

[0069] Figure 1 A schematic diagram showing a flow chart of a method for determining a candidate cell according to some embodiments of the present disclosure.

[0070] like Figure 1 As shown, the candidate cell determination method of this embodiment includes steps 101-102, and further includes steps 103-104 as needed. Steps 101-102 are used to add LTM candidate cells. Steps 103-104 are used to modify or update LTM candidate cells.

[0071] In step 101, a first network node sends a first signaling to a second network node.

[0072] The first signaling includes at least one of the following information: first LTM indication information (LTM indicator), indicating that the current first signaling is an LTM request; (recommended) candidate cell (Candidate Cell) identifier or index; the maximum allowed number of candidate cells; reference configuration (reference configuration).

[0073] Among them, for the maximum allowed number of candidate cells information element (Maximum Candidate Cell numberInformation Element), the maximum allowed number of candidate cells is set by the source node (first network node), indicating the maximum number of candidate cells that can be set for the current terminal. The specific value of the maximum allowed number of candidate cells is set to, for example but not limited to, 8, 16, 32, etc., to avoid configuring too many candidate cells for the terminal when there are many candidate nodes, thereby increasing terminal energy consumption.

[0074] Among them, for the RRC (Radio Resource Control) configuration configured for the terminal, delta configuration can be used to save configuration overhead. The triggering node (first network node) provides a reference configuration, the receiving node (second network node) generates an incremental configuration based on the reference configuration, and the second network node sends the RRC configuration to the terminal through the incremental configuration.

[0075] The first network node and the second network node are, for example, RAN nodes, and the RAN nodes include, but are not limited to, NG-RAN nodes. The RAN nodes are, for example, base stations.

[0076] In step 102, the first network node receives second signaling fed back by the second network node.

[0077] The second signaling includes a candidate cell identifier or index that accepts the LTM request. The second signaling includes one or more of the following information for each candidate cell identifier or index that accepts the LTM request: random access related configuration information; reference signal resource configuration; maximum time for reserving resources for the terminal; and indication of the degree of acceptance of early data forwarding. The second signaling also includes an incremental configuration, which is generated based on the reference configuration carried in the first signaling.

[0078] The random access related configuration information includes preamble related configuration information and / or random access response (Random Access Response, RAR) related indication information.

[0079] The preamble code related configuration information includes one or more of the following information: the root sequence index required to generate the preamble code; the time-frequency resource location information for sending the preamble code; the time information for sending the preamble code; the retransmission configuration information of the preamble code. The retransmission configuration information of the preamble code includes one or more of the following information: whether to retransmit; the maximum number of retransmissions; the initial transmission power; and the power ramp-up strategy.

[0080] The RAR related configuration information includes one or more of the following information: whether there is a RAR message indication information; RAR source indication information, used to indicate whether the terminal receives the RAR from the source cell or the candidate cell; and the length of the RAR detection window time.

[0081] The reference signal resource configuration includes one or more of the following information: CSI-RS (Channel State Information-Reference Signal) resource configuration; SSB resource configuration. So that the terminal can monitor the reference signal on the specified resource for downlink synchronization. Among them, SSB stands for Synchronization Signal and PBCH block (SSB for short), which consists of three parts: Primary Synchronization Signals (PSS for short), Secondary Synchronization Signals (SSS for short), and PBCH (physical broadcast Channel for short).

[0082] The maximum time for reserving resources for the terminal is used to indicate the maximum time that the candidate cell can reserve resources for the terminal. This auxiliary information is provided by the candidate node to help the source node manage the candidate cell set and trigger the LTM modification process at the appropriate time.

[0083] The acceptance level indication information of advance data forwarding has a value range of, for example, [0, 100], indicating the percentage of acceptance level of advance data forwarding. The advance data forwarding process is supported under the LTM mechanism. Considering that advance data forwarding will increase the load of candidate nodes, candidate nodes can carry this information element to inform the source node of its acceptance level of advance data forwarding, helping the source node to select a more appropriate data forwarding solution, such as using a delayed data forwarding process for candidate nodes with a low acceptance level.

[0084] In step 103, the first network node sends a third signaling to the second network node.

[0085] The third signaling includes at least one of the following information: second LTM indication information, indicating that the current third signaling is an LTM modification request; and a candidate cell identifier or index requested to be modified.

[0086] In step 104, the first network node receives the fourth signaling fed back by the second network node.

[0087] The fourth signaling includes a modified candidate cell identifier or index. The fourth signaling includes one or more of the following information for each candidate cell identifier or index requested to be modified: random access related configuration information; reference signal resource configuration; maximum time for reserving resources for the terminal; and advance data forwarding acceptance level indication information. The meaning and related explanations of each information element are as mentioned above and will not be repeated here.

[0088] In the disclosed embodiment, the network node can exchange LTM configuration and candidate cell related information between Xn interfaces, which can help the network screen out a more suitable candidate cell set and improve the reliability of the LTM mechanism. The application scenarios of LTM are effectively expanded, so that it can be effectively applied to mobility scenarios such as outdoor high-speed rail, and effectively ensure the business continuity of emerging applications.

[0089] Under the LTM mechanism of the related technology, the auxiliary information exchanged during the candidate cell selection process is limited, and only supports the source DU to select a suitable candidate cell based on the measurement report reported by the terminal. Considering that the measurement report is affected by timeliness and that configuring too many candidate cells for the terminal may lead to high terminal energy consumption (continuously measuring and evaluating a large number of candidate cells will seriously increase terminal energy consumption), the present disclosure focuses on the candidate cell selection and modification process, designs and adds a number of auxiliary information to help the source node and the candidate node select a more reasonable set of candidate cells (in terms of quantity and quality).

[0090] The candidate cell determination method can be applied to various scenarios, which are described below respectively.

[0091] Figure 2 A schematic diagram showing the application of the candidate cell determination method according to some embodiments of the present disclosure to a handover scenario.

[0092] In a handover scenario, the first network node is a source base station, the second network node is a candidate target base station, the first signaling is a handover request signaling, the second signaling is a handover request response signaling, the third signaling is a handover request signaling, and the fourth signaling is a handover request response signaling.

[0093] like Figure 2 As shown, the candidate cell determination method of this embodiment is applied to the handover scenario and includes:

[0094] In step 201, the terminal sends a measurement report to the source base station, the measurement report including, for example, signal quality information of surrounding cells measured by the terminal. The source base station selects candidate cell identifiers or indexes based on the measurement report.

[0095] In step 202, the source base station sends a first signaling to the candidate target base station of the candidate cell: a handover request signaling, the first signaling including at least one of the following information: a first LTM indication information, indicating that the current first signaling is an LTM request; a candidate cell identifier or index; a maximum allowed number of candidate cells; and a reference configuration.

[0096] In step 203, the candidate target base station feeds back a second signaling to the source base station: a handover request response (Handover Request Acknowledge) signaling, the second signaling includes a candidate cell identifier or index that accepts the LTM request, and the second signaling also includes one or more of the following information for each candidate cell identifier or index that accepts the LTM request: random access-related configuration information; reference signal resource configuration; maximum time for reserving resources for the terminal; advance data forwarding acceptance level indication information; if the first signaling carries a reference configuration, the second signaling also includes an incremental configuration, and the incremental configuration is generated based on the reference configuration carried in the first signaling.

[0097] In step 204, the source base station sends an RRC reconfiguration message to the terminal, where the RRC reconfiguration message includes the candidate cell identifier or index that accepts the LTM request. For each candidate cell identifier or index that accepts the LTM request, the RRC reconfiguration message also includes one or more of the following information: random access-related configuration information; reference signal resource configuration; maximum time for reserving resources for the terminal; advance data forwarding acceptance level indication information; the RRC reconfiguration message also includes RRC-related incremental configuration or full configuration.

[0098] In step 205, the terminal sends an RRC Reconfiguration Complete message to the source base station.

[0099] Then, the terminal and the candidate cell may perform an LTM evaluation or execution procedure.

[0100] If the source base station wants to modify or update the LTM candidate cell, it may continue to perform the following steps.

[0101] In step 206, the source base station sends a third signaling to the candidate target base station of the candidate cell: a handover request signaling, wherein the third signaling includes at least one of the following information: second LTM indication information, indicating that the current third signaling is an LTM modification request; and the candidate cell identifier or index requested to be modified.

[0102] In step 207, the candidate target base station feeds back a fourth signaling to the source base station: a handover request response (Handover Request Acknowledge) signaling, and the fourth signaling includes a modified candidate cell identifier or index. The fourth signaling includes one or more of the following information for each candidate cell identifier or index requested to be modified: random access related configuration information; reference signal resource configuration; maximum time for reserving resources for the terminal; and advance data forwarding acceptance level indication information.

[0103] According to the disclosed embodiments, in a handover scenario, network nodes can exchange LTM configuration and candidate cell related information between Xn interfaces, which can help the network screen out a more suitable candidate cell set and improve the reliability of the LTM mechanism.

[0104] Figure 3 A schematic diagram showing the application of the candidate cell determination method of some embodiments of the present disclosure to a scenario where a secondary node is added or changed and triggered by a primary node in a dual-connection scenario.

[0105] In the scenario of adding or changing a secondary node triggered by a primary node in a dual-connection scenario, the first network node is a primary node, the second network node is a candidate target secondary node, the first signaling is a secondary node adding request signaling, the second signaling is a secondary node adding feedback signaling, the third signaling is a secondary node changing request signaling, and the fourth node is a secondary node changing request feedback signaling.

[0106] like Figure 3 As shown, the candidate cell determination method of this embodiment is applied to the scenario of adding or changing a secondary node triggered by a primary node in a dual-connection scenario, including:

[0107] In step 301, the terminal sends a measurement report to the master node, the measurement report including, for example, signal quality information of surrounding cells measured by the terminal. The master node selects candidate cell identifiers or indexes based on the measurement report.

[0108] In step 302, the master node sends a first signaling to the candidate target secondary node of the candidate cell: a secondary node addition request (SgNB / SN Addition Request) signaling, the first signaling including at least one of the following information: a first LTM indication information, indicating that the current first signaling is an LTM request; a candidate cell identifier or index; a maximum allowed number of candidate cells; and a reference configuration.

[0109] In step 303, the candidate target auxiliary node feeds back a second signaling to the main node: auxiliary node addition feedback (SgNB / SNAddition Request Acknowledge) signaling, the second signaling includes the candidate cell identifier or index that accepts the LTM request, and the second signaling also includes one or more of the following information for each candidate cell identifier or index that accepts the LTM request: random access-related configuration information; reference signal resource configuration; maximum time to reserve resources for the terminal; advance data forwarding acceptance degree indication information; if the first signaling carries a reference configuration, the second signaling also includes an incremental configuration, and the incremental configuration is generated based on the reference configuration carried in the first signaling.

[0110] In step 304 , the master node sends an RRC reconfiguration message to the terminal. For information carried in the RRC reconfiguration message, refer to the description in step 204 .

[0111] In step 305, the terminal sends an RRC Reconfiguration Complete message to the master node.

[0112] Then, the terminal and the candidate cell may perform an LTM evaluation or execution procedure.

[0113] If the master node wants to modify or update the LTM candidate cell, it may continue to perform the following steps.

[0114] In step 306, the master node sends a third signaling to the candidate target secondary node of the candidate cell: a secondary node change request (SgNB / SN Modification Request) signaling, and the third signaling includes at least one of the following information: a second LTM indication information, indicating that the current third signaling is an LTM modification request; and an identifier or index of the candidate cell requested to be modified.

[0115] In step 307, the candidate target secondary node sends a fourth signaling to the primary node: a secondary node change request feedback (SgNB / SN Modification Request Acknowledge) signaling, and the fourth signaling includes a modified candidate cell identifier or index. The fourth signaling includes one or more of the following information for each candidate cell identifier or index requested to be modified: random access related configuration information; reference signal resource configuration; maximum time for reserving resources for the terminal; and advance data forwarding acceptance level indication information.

[0116] In the embodiment of the present disclosure, in the scenario where a secondary node is added or changed triggered by a primary node in a dual-connection scenario, network nodes can exchange LTM configuration and candidate cell-related information between Xn interfaces, which can help the network screen out a more suitable set of candidate cells and improve the reliability of the LTM mechanism.

[0117] The candidate cell determination method is applied to the scenario of adding or changing a secondary node triggered by a secondary node in a dual-connection scenario. In the scenario of adding or changing a secondary node triggered by a secondary node in a dual-connection scenario, the first network node is a primary node, the second network node is a secondary node, the first signaling is a secondary node adding request signaling, the second signaling is a secondary node adding request feedback signaling, the third signaling is a secondary node changing request signaling, and the fourth node is a secondary node changing request feedback signaling.

[0118] Figure 4 A schematic diagram showing the application of the candidate cell determination method of some embodiments of the present disclosure to a secondary node adding scenario triggered by a secondary node in a dual-connection scenario.

[0119] In step 401, the terminal forwards the measurement report to the source secondary node through the master node or through SRB3 (Signaling Radio Bearer 3), and the measurement report includes, for example, signal quality information of surrounding cells measured by the terminal. The source secondary node selects candidate cell identifiers or indexes based on the measurement report.

[0120] In step 402, the source auxiliary node sends the fifth signaling to the master node: auxiliary node change requirement (SgNB / SN ChangeRequired) signaling, and the fifth signaling includes at least one of the following information: first LTM indication information, indicating that the current fifth signaling is an LTM request; candidate cell identifier or index; maximum allowed number of candidate cells; reference configuration.

[0121] In step 403, the master node sends a first signaling to the candidate target secondary node of the candidate cell: a secondary node addition request (SgNB / SN Addition Request) signaling, the first signaling including at least one of the following information: a first LTM indication information, indicating that the current first signaling is an LTM request; a candidate cell identifier or index; a maximum allowed number of candidate cells; and a reference configuration.

[0122] In step 404, the candidate target auxiliary node feeds back a second signaling to the main node: auxiliary node addition feedback (SgNB / SNAddition Request Acknowledge) signaling, the second signaling includes the candidate cell identifier or index that accepts the LTM request, and the second signaling also includes one or more of the following information for each candidate cell identifier or index that accepts the LTM request: random access-related configuration information; reference signal resource configuration; maximum time for reserving resources for the terminal; advance data forwarding acceptance degree indication information; if the first signaling carries a reference configuration, the second signaling also includes an incremental configuration, and the incremental configuration is generated based on the reference configuration carried in the first signaling.

[0123] In step 405 , the master node sends an RRC reconfiguration message to the terminal. For information carried in the RRC reconfiguration message, refer to the description in step 204 .

[0124] In step 406, the terminal sends an RRC Reconfiguration Complete message to the master node.

[0125] In step 407, the master node sends a sixth signaling to the source secondary node: a secondary node change confirmation (SgNB / SN ChangeConfirm) signaling, where the sixth signaling includes a candidate cell identifier or index that accepts the LTM request.

[0126] In the embodiment of the present disclosure, in the auxiliary node addition scenario triggered by the auxiliary node in the dual connection scenario, the network node can exchange LTM configuration and candidate cell related information between the Xn interface, which can help the network screen out a more suitable candidate cell set and improve the reliability of the LTM mechanism.

[0127] Figure 5 A schematic diagram showing the application of the candidate cell determination method of some embodiments of the present disclosure to a secondary node change scenario triggered by a secondary node in a dual connectivity scenario.

[0128] In step 501, LTM preparation is completed, the source auxiliary node decides to modify the candidate cell or related configuration, and the source auxiliary node sends the seventh signaling to the master node: auxiliary node change requirement (SgNB / SN Modification Required) signaling, and the seventh signaling includes at least one of the following information: second LTM indication information, indicating that the current seventh signaling is an LTM modification request; the candidate cell identifier or index requested to be modified.

[0129] In step 502, the master node sends a third signaling to the candidate target secondary node of the candidate cell: a secondary node change request (SgNB / SN Modification Request) signaling, and the third signaling includes at least one of the following information: a second LTM indication information, indicating that the current third signaling is an LTM modification request; and an identifier or index of the candidate cell requested to be modified.

[0130] In step 503, the candidate target secondary node sends a fourth signaling to the primary node: secondary node change request feedback (SgNB / SN Modification Request Acknowledge) signaling. The fourth signaling includes the modified candidate cell identifier or index. The fourth signaling includes one or more of the following information for each candidate cell identifier or index requested to be modified: random access related configuration information; reference signal resource configuration; maximum time to reserve resources for the terminal; advance data forwarding acceptance level indication information.

[0131] In step 504 , the master node sends an RRC reconfiguration message to the terminal. For information carried in the RRC reconfiguration message, refer to the description in step 204 .

[0132] In step 505, the terminal sends an RRC Reconfiguration Complete message to the master node.

[0133] In step 506, the master node sends an eighth signaling to the source secondary node: a secondary node change confirmation (SgNB / SNModificationConfirm) signaling, where the eighth signaling includes a modified candidate cell identifier or index.

[0134] In the disclosed embodiment, in the secondary node change scenario triggered by the secondary node in the dual connection scenario, the network node can exchange LTM configuration and candidate cell related information between the Xn interface, which can help the network screen out a more suitable set of candidate cells and improve the reliability of the LTM mechanism.

[0135] Figure 6 A schematic diagram of a network node according to some embodiments of the present disclosure is shown. The network node includes a first network node and a second network node.

[0136] like Figure 6 As shown, the network node 600 of this embodiment includes: a memory 610 and a processor 620 coupled to the memory 610 , and the processor 620 is configured to execute the candidate cell determination method in any of the aforementioned embodiments based on instructions stored in the memory 610 .

[0137] The network node 600 may further include an input / output interface 630 , a network interface 640 , a storage interface 650 , etc. These interfaces 630 , 640 , 650 , the memory 610 , and the processor 620 may be connected via a bus 660 , for example.

[0138] The memory 610 may include, for example, a system memory, a fixed non-volatile storage medium, etc. The system memory may store, for example, an operating system, an application program, a boot loader, and other programs.

[0139] The processor 620 may be implemented by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistors and other discrete hardware components.

[0140] Among them, the input and output interface 630 provides a connection interface for input and output devices such as a display, a mouse, a keyboard, and a touch screen. The network interface 640 provides a connection interface for various networked devices. The storage interface 650 provides a connection interface for external storage devices such as SD cards and USB flash drives. The bus 660 can use any bus structure among a variety of bus structures. For example, the bus structure includes but is not limited to the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MCA) bus, and the Peripheral Component Interconnect (PCI) bus.

[0141] Some embodiments of the present disclosure provide a network node, including: modules for executing a candidate cell determination method. These modules are described below.

[0142] The first sending module is configured to send a first signaling to the second network node, wherein the first signaling includes at least one of the following information: first LTM indication information indicating that the current first signaling is an LTM request; a candidate cell identifier or index; a maximum allowed number of candidate cells; and a reference configuration;

[0143] The first receiving module is configured to receive a second signaling fed back by a second network node, where the second signaling includes an identifier or index of a candidate cell that accepts the LTM request.

[0144] The second signaling includes one or more of the following information for each candidate cell identifier or index that accepts the LTM request:

[0145] Random access related configuration information;

[0146] Reference signal resource configuration;

[0147] The maximum time to reserve resources for the terminal;

[0148] Advance data forwarding acceptance level indication information.

[0149] The first sending module is configured to send a third signaling to the second network node, where the third signaling includes at least one of the following information: second LTM indication information, indicating that the current third signaling is an LTM modification request; and a candidate cell identifier or index requested to be modified.

[0150] The first receiving module is configured to receive fourth signaling fed back by the second network node, where the fourth signaling includes a modified candidate cell identifier or index.

[0151] The fourth signaling includes one or more of the following information for each candidate cell identifier or index requested to be modified:

[0152] Random access related configuration information;

[0153] Reference signal resource configuration;

[0154] The maximum time to reserve resources for the terminal;

[0155] Advance data forwarding acceptance level indication information.

[0156] The second receiving module is configured to receive a first signaling sent by the first network node, wherein the first signaling includes at least one of the following information: first LTM indication information indicating that the current first signaling is an LTM request; a candidate cell identifier or index; a maximum allowed number of candidate cells; and a reference configuration;

[0157] The second sending module is configured to send a second signaling to the first network node, where the second signaling includes an identifier or index of a candidate cell that accepts the LTM request.

[0158] The second signaling includes one or more of the following information for each candidate cell identifier or index that accepts the LTM request:

[0159] Random access related configuration information;

[0160] Reference signal resource configuration;

[0161] The maximum time to reserve resources for the terminal;

[0162] Advance data forwarding acceptance level indication information.

[0163] The second receiving module is configured to receive a third signaling sent by the first network node, wherein the third signaling includes at least one of the following information: second LTM indication information indicating that the current third signaling is an LTM modification request; an identifier or index of a candidate cell requested to be modified;

[0164] The second sending module is configured to send a fourth signaling to the first network node, where the fourth signaling includes a modified candidate cell identifier or index.

[0165] The fourth signaling includes one or more of the following information for each candidate cell identifier or index requested to be modified:

[0166] Random access related configuration information;

[0167] Reference signal resource configuration;

[0168] The maximum time to reserve resources for the terminal;

[0169] Advance data forwarding acceptance level indication information.

[0170] Figure 7 A schematic diagram showing a communication system according to some embodiments of the present disclosure.

[0171] like Figure 7 As shown, the communication system 700 of this embodiment includes: a first network node 710, configured to execute the candidate cell determination method executed by the first network node; and a second network node 720, configured to execute the candidate cell determination method executed by the second network node.

[0172] (1) A method for determining a candidate cell, comprising:

[0173] The first network node sends a first signaling to the second network node, wherein the first signaling includes at least one of the following information: first LTM indication information, indicating that the current first signaling is an LTM request; a candidate cell identifier or index; a maximum allowed number of candidate cells; a reference configuration; wherein LTM indicates mobility triggered by layer 1 or layer 2;

[0174] The first network node receives second signaling fed back by the second network node, where the second signaling includes an identifier or index of a candidate cell for accepting the LTM request.

[0175] (2) According to (1), the second signaling includes one or more of the following information for each candidate cell identifier or index that accepts the LTM request:

[0176] Random access related configuration information;

[0177] Reference signal resource configuration;

[0178] The maximum time to reserve resources for the terminal;

[0179] Advance data forwarding acceptance level indication information.

[0180] (3) According to (1-2), the second signaling further includes an incremental configuration, and the incremental configuration is generated based on the reference configuration carried in the first signaling.

[0181] (4) According to (1-3), it also includes:

[0182] The first network node sends a third signaling to the second network node, where the third signaling includes at least one of the following information: second LTM indication information, indicating that the current third signaling is an LTM modification request; an identifier or index of a candidate cell requested to be modified;

[0183] The first network node receives fourth signaling fed back by the second network node, where the fourth signaling includes a modified candidate cell identifier or index.

[0184] (5) According to (4), the fourth signaling includes one or more of the following information for each candidate cell identifier or index requested to be modified:

[0185] Random access related configuration information;

[0186] Reference signal resource configuration;

[0187] The maximum time to reserve resources for the terminal;

[0188] Advance data forwarding acceptance level indication information.

[0189] (6) According to (2 or 5), the random access-related configuration information includes preamble-related configuration information and / or random access response (RAR)-related configuration information,

[0190] The preamble-related configuration information includes one or more of the following information: a root sequence index required to generate a preamble; time-frequency resource location information for sending the preamble; time information for sending the preamble; and retransmission configuration information for the preamble;

[0191] The RAR related configuration information includes one or more of the following information: whether there is a RAR message indication information; RAR source indication information, used to indicate whether the terminal receives the RAR from the source cell or the candidate cell; and the length of the RAR detection window time.

[0192] (7) According to (6), the retransmission configuration information of the preamble includes one or more of the following information:

[0193] Whether to retransmit;

[0194] Maximum number of retransmissions;

[0195] Initial transmission power;

[0196] Power climbing strategy.

[0197] (8) According to (2 or 5), the reference signal resource configuration includes one or more of the following information:

[0198] CSI-RS resource configuration;

[0199] SSB resource configuration.

[0200] (9) According to (1-8), in a handover scenario, the first network node is a source base station, the second network node is a candidate target base station, the first signaling is a handover request signaling, the second signaling is a handover request response signaling, the third signaling is a handover request signaling, and the fourth signaling is a handover request response signaling.

[0201] (10) According to (1-8), in the scenario of adding or changing a secondary node triggered by the primary node in a dual-connection scenario, the first network node is the primary node, the second network node is a candidate target secondary node, the first signaling is a secondary node adding request signaling, the second signaling is a secondary node adding feedback signaling, the third signaling is a secondary node changing request signaling, and the fourth node is a secondary node changing request feedback signaling.

[0202] (11) According to (1-8), in the scenario of adding or changing a secondary node triggered by a secondary node in a dual-connection scenario, the first network node is a primary node, the second network node is a secondary node, the first signaling is a secondary node adding request signaling, the second signaling is a secondary node adding request feedback signaling, the third signaling is a secondary node changing request signaling, and the fourth node is a secondary node changing request feedback signaling.

[0203] (12) According to (11), it also includes one or more of the following steps:

[0204] Before sending the first signaling, the first network node receives a fifth signaling sent by the second network node, wherein the fifth signaling includes at least one of the following information: first LTM indication information, indicating that the current fifth signaling is an LTM request; a candidate cell identifier or index; a maximum allowed number of candidate cells; a reference configuration; wherein LTM indicates mobility triggered by layer 1 or layer 2;

[0205] After receiving the second signaling, the first network node sends a sixth signaling to the second network node, where the sixth signaling includes an identifier or index of a candidate cell accepting the LTM request;

[0206] Before sending the third signaling, the first network node receives a seventh signaling sent by the second network node, where the seventh signaling includes at least one of the following information: second LTM indication information indicating that the current seventh signaling is an LTM modification request; an identifier or index of a candidate cell requested to be modified;

[0207] After receiving the fourth signaling, the first network node sends an eighth signaling to the second network node, where the eighth signaling includes a modified candidate cell identifier or index.

[0208] (13) A method for determining a candidate cell, comprising:

[0209] The second network node receives a first signaling sent by the first network node, wherein the first signaling includes at least one of the following information: first LTM indication information, indicating that the current first signaling is an LTM request; a candidate cell identifier or index; a maximum allowed number of candidate cells; a reference configuration; wherein LTM indicates mobility triggered by layer 1 or layer 2;

[0210] The second network node sends a second signaling to the first network node, where the second signaling includes an identifier or index of a candidate cell for accepting the LTM request.

[0211] (14) According to (13), the second signaling includes one or more of the following information for each candidate cell identifier or index that accepts the LTM request:

[0212] Random access related configuration information;

[0213] Reference signal resource configuration;

[0214] The maximum time to reserve resources for the terminal;

[0215] Advance data forwarding acceptance level indication information.

[0216] (15) According to (13-14), the second signaling also includes an incremental configuration, and the incremental configuration is generated based on the reference configuration carried in the first signaling.

[0217] (16) According to (13-16), it also includes:

[0218] The second network node receives a third signaling sent by the first network node, where the third signaling includes at least one of the following information: second LTM indication information, indicating that the current third signaling is an LTM modification request; an identifier or index of a candidate cell requested to be modified;

[0219] The second network node sends a fourth signaling to the first network node, where the fourth signaling includes a modified candidate cell identifier or index.

[0220] (17) According to (16), the fourth signaling includes one or more of the following information for each candidate cell identifier or index requested to be modified:

[0221] Random access related configuration information;

[0222] Reference signal resource configuration;

[0223] The maximum time to reserve resources for the terminal;

[0224] Advance data forwarding acceptance level indication information.

[0225] (18) According to (14 or 17), the random access-related configuration information includes preamble-related configuration information and / or random access response (RAR)-related configuration information,

[0226] The preamble-related configuration information includes one or more of the following information: a root sequence index required to generate a preamble; time-frequency resource location information for sending the preamble; time information for sending the preamble; and retransmission configuration information for the preamble;

[0227] The RAR related configuration information includes one or more of the following information: whether there is a RAR message indication information; RAR source indication information, used to indicate whether the terminal receives the RAR from the source cell or the candidate cell; and the length of the RAR detection window time.

[0228] (19) According to (18), the retransmission configuration information of the preamble includes one or more of the following information:

[0229] Whether to retransmit;

[0230] Maximum number of retransmissions;

[0231] Initial transmission power;

[0232] Power climbing strategy.

[0233] (20) According to (14 or 17), the reference signal resource configuration includes one or more of the following information:

[0234] CSI-RS resource configuration;

[0235] SSB resource configuration.

[0236] Some embodiments of the present disclosure provide a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, the steps of the candidate cell determination method are implemented. The storage medium may be, for example, a non-transitory computer-readable storage medium.

[0237] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present disclosure may take the form of a computer program product implemented on one or more non-transient computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer program code.

[0238] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0239] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0240] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0241] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A method for determining a candidate cell, comprising: The first network node sends a first signaling to the second network node, wherein the first signaling includes at least one of the following information: first LTM indication information, indicating that the current first signaling is an LTM request; a candidate cell identifier or index; a maximum allowed number of candidate cells; a reference configuration; wherein LTM indicates mobility triggered by layer 1 or layer 2; The first network node receives second signaling fed back by the second network node, where the second signaling includes an identifier or index of a candidate cell for accepting the LTM request.

2. The method according to claim 1, wherein the second signaling includes one or more of the following information for each candidate cell identifier or index that accepts the LTM request: Random access related configuration information; Reference signal resource configuration; The maximum time to reserve resources for the terminal; Advance data forwarding acceptance level indication information.

3. According to the method of claim 1, the second signaling further includes an incremental configuration, and the incremental configuration is generated based on the reference configuration carried in the first signaling.

4. The method according to any one of claims 1 to 3, further comprising: The first network node sends a third signaling to the second network node, where the third signaling includes at least one of the following information: second LTM indication information, indicating that the current third signaling is an LTM modification request; an identifier or index of a candidate cell requested to be modified; The first network node receives fourth signaling fed back by the second network node, where the fourth signaling includes a modified candidate cell identifier or index.

5. The method according to claim 4, wherein the fourth signaling includes one or more of the following information for each candidate cell identifier or index requested to be modified: Random access related configuration information; Reference signal resource configuration; The maximum time to reserve resources for the terminal; Advance data forwarding acceptance level indication information.

6. The method according to claim 2 or 5, wherein the random access-related configuration information comprises preamble-related configuration information and / or random access response (RAR)-related configuration information. The preamble-related configuration information includes one or more of the following information: a root sequence index required to generate a preamble; time-frequency resource location information for sending the preamble; time information for sending the preamble; and retransmission configuration information for the preamble; The RAR related configuration information includes one or more of the following information: whether there is a RAR message indication information; RAR source indication information, used to indicate whether the terminal receives the RAR from the source cell or the candidate cell; and the length of the RAR detection window time.

7. The method according to claim 6, wherein the retransmission configuration information of the preamble comprises one or more of the following information: Whether to retransmit; Maximum number of retransmissions; Initial transmission power; Power climbing strategy.

8. The method according to claim 2 or 5, wherein the reference signal resource configuration includes one or more of the following information: CSI-RS resource configuration; SSB resource configuration.

9. The method according to any one of claims 4-5, characterized in that: In a handover scenario, the first network node is a source base station, the second network node is a candidate target base station, the first signaling is a handover request signaling, the second signaling is a handover request response signaling, the third signaling is a handover request signaling, and the fourth signaling is a handover request response signaling.

10. The method according to any one of claims 4-5, characterized in that: In the scenario of adding or changing a secondary node triggered by a primary node in a dual-connection scenario, the first network node is a primary node, the second network node is a candidate target secondary node, the first signaling is a secondary node adding request signaling, the second signaling is a secondary node adding feedback signaling, the third signaling is a secondary node changing request signaling, and the fourth node is a secondary node changing request feedback signaling.

11. The method according to any one of claims 4 to 5, characterized in that: In the scenario of adding or changing a secondary node triggered by a secondary node in a dual-connection scenario, the first network node is a primary node, the second network node is a secondary node, the first signaling is a secondary node adding request signaling, the second signaling is a secondary node adding request feedback signaling, the third signaling is a secondary node changing request signaling, and the fourth node is a secondary node changing request feedback signaling.

12. The method according to claim 11, characterized in that It also includes one or more of the following steps: Before sending the first signaling, the first network node receives a fifth signaling sent by the second network node, wherein the fifth signaling includes at least one of the following information: first LTM indication information, indicating that the current fifth signaling is an LTM request; a candidate cell identifier or index; a maximum allowed number of candidate cells; a reference configuration; After receiving the second signaling, the first network node sends a sixth signaling to the second network node, where the sixth signaling includes an identifier or index of a candidate cell accepting the LTM request; Before sending the third signaling, the first network node receives a seventh signaling sent by the second network node, where the seventh signaling includes at least one of the following information: second LTM indication information indicating that the current seventh signaling is an LTM modification request; an identifier or index of a candidate cell requested to be modified; After receiving the fourth signaling, the first network node sends an eighth signaling to the second network node, where the eighth signaling includes a modified candidate cell identifier or index.

13. A method for determining a candidate cell, comprising: The second network node receives a first signaling sent by the first network node, wherein the first signaling includes at least one of the following information: first LTM indication information, indicating that the current first signaling is an LTM request; a candidate cell identifier or index; a maximum allowed number of candidate cells; a reference configuration; wherein LTM indicates mobility triggered by layer 1 or layer 2; The second network node sends a second signaling to the first network node, where the second signaling includes an identifier or index of a candidate cell for accepting the LTM request.

14. The method according to claim 13, wherein the second signaling includes one or more of the following information for each candidate cell identity or index that accepts the LTM request: Random access related configuration information; Reference signal resource configuration; The maximum time to reserve resources for the terminal; Advance data forwarding acceptance level indication information.

15. The method according to claim 13, wherein the second signaling further includes an incremental configuration, and the incremental configuration is generated based on a reference configuration carried in the first signaling.

16. The method according to any one of claims 13 to 15, further comprising: The second network node receives a third signaling sent by the first network node, where the third signaling includes at least one of the following information: second LTM indication information, indicating that the current third signaling is an LTM modification request; an identifier or index of a candidate cell requested to be modified; The second network node sends a fourth signaling to the first network node, where the fourth signaling includes a modified candidate cell identifier or index.

17. The method according to claim 16, wherein the fourth signaling includes one or more of the following information for each candidate cell identifier or index requested to be modified: Random access related configuration information; Reference signal resource configuration; The maximum time to reserve resources for the terminal; Advance data forwarding acceptance level indication information.

18. The method according to claim 14 or 17, wherein the random access-related configuration information comprises preamble-related configuration information and / or random access response (RAR)-related configuration information. The preamble-related configuration information includes one or more of the following information: a root sequence index required to generate a preamble; time-frequency resource location information for sending the preamble; time information for sending the preamble; and retransmission configuration information for the preamble; The RAR related configuration information includes one or more of the following information: whether there is a RAR message indication information; RAR source indication information, used to indicate whether the terminal receives the RAR from the source cell or the candidate cell; and the length of the RAR detection window time.

19. The method according to claim 18, wherein the retransmission configuration information of the preamble comprises one or more of the following information: Whether to retransmit; Maximum number of retransmissions; Initial transmission power; Power climbing strategy.

20. The method according to claim 14 or 17, wherein the reference signal resource configuration comprises one or more of the following information: CSI-RS resource configuration; SSB resource configuration.

21. A network node, comprising: Memory; as well as A processor coupled to the memory, wherein the processor is configured to execute the candidate cell determination method according to any one of claims 1 to 20 based on instructions stored in the memory.

22. A network node, comprising: A module for executing the candidate cell determination method according to any one of claims 1 to 20.

23. A communication system comprising: A first network node, configured to execute the candidate cell determination method according to any one of claims 1 to 12; as well as The second network node is configured to execute the candidate cell determination method according to any one of claims 13 to 20.

24. A computer-readable storage medium having a computer program stored thereon, wherein when the program is executed by a processor, the steps of the candidate cell determination method according to any one of claims 1 to 20 are implemented.

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