Communication control method, equipment and medium

Abstract

Disclosed are a communication control method, device and medium, which relate to the technical field of communications, the method comprising: receiving, by a base station distribution unit, a report sent by a base station concentration unit; when it is determined that LTM switching failure or approximate failure is irrelevant to itself based on the report, the base station distribution unit sends a first message to the base station concentration unit, so that the base station concentration unit forwards the report to a target node according to the first message, and the received report sent by the base station concentration unit is judged through the base station distribution unit; the method comprises the following steps: determining whether LTM switching failure or proximity failure is related to itself or not, and then sending a first message to a base station concentration unit under the condition that the LTM switching failure or proximity failure is not related to itself, so that the base station concentration unit determines a target node according to the first message, and further forwards a report to the target node. A target node causing an LTM handover failure or proximity failure can successfully receive a report triggered by the LTM handover failure or proximity failure.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a communication control method, device and medium. Background Technology

[0002] In related technologies, LTM supports the movement of different DUs within a base station distributed unit (DU) and between base station centralized units (CU). However, when LTM handover occurs between different DUs, the target node (e.g., the target DU or the target base station) that causes LTM handover failure or near failure cannot receive the report from the user equipment (UE) side triggered by LTM failure or near failure. As a result, the target node cannot optimize the relevant LTM process or LTM configuration parameters. Summary of the Invention

[0003] The main objective of this application is to provide a communication control method, device, and medium, which aims to solve the technical problem that the target node causing LTM handover failure or near failure cannot receive the LTM failure or near failure trigger report.

[0004] To achieve the above objectives, embodiments of this application provide a communication control method applied to a base station distribution unit, the method comprising:

[0005] Receive reports sent by the base station central unit;

[0006] If, based on the report, it is determined that the LTM handover failure or near failure is not related to itself, a first message is sent to the base station centralization unit, so that the base station centralization unit forwards the report to the target node according to the first message.

[0007] This application also provides a communication control method applied to a base station central unit, the method comprising:

[0008] A report is sent to the base station distribution unit so that, if the base station distribution unit determines, based on the report, that the LTM handover failure or near failure is not related to itself, it sends a first message to the base station centralization unit.

[0009] Receive the first message and forward the report to the target node according to the first message.

[0010] This application also provides a communication control method applied to a base station distribution unit, the method comprising:

[0011] Receive reports sent by the base station central unit;

[0012] If, based on the report, it is determined that the LTM handover failure or near-failure is related to itself, the LTM handover process and / or configuration parameters shall be optimized according to the report.

[0013] This application also provides a network device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the communication control method described above.

[0014] This application embodiment also provides a storage medium, which is a computer-readable storage medium, and stores a computer program thereon. When the computer program is executed by a processor, it implements the steps of the communication control method described above.

[0015] This application discloses a communication control method in which a base station distribution unit receives a report sent by a base station central unit. If, based on the report, it is determined that the LTM handover failure or near-failure is not related to the distribution unit, the base station distribution unit sends a first message to the base station central unit, causing the base station central unit to forward the report to a target node according to the first message. The base station distribution unit judges the received report from the base station central unit to determine whether the LTM handover failure or near-failure is related to it. If the LTM handover failure or near-failure is not related to the distribution unit, it sends a first message to the base station central unit, causing the base station central unit to determine the target node causing the LTM handover failure or near-failure based on the first message, and then forwards the report to the corresponding target node, ensuring that the target node causing the LTM handover failure or near-failure can successfully receive the report triggered by the LTM handover failure or near-failure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the operating device of the hardware operating environment involved in the embodiments of this application;

[0017] Figure 2 This is a flowchart illustrating the communication control method according to the first embodiment;

[0018] Figure 3 This is a schematic diagram of the interaction timing according to the second embodiment;

[0019] Figure 4 This is a schematic diagram of the interaction timing according to the third embodiment;

[0020] Figure 5 This is a flowchart illustrating the communication control method according to the fourth embodiment;

[0021] Figure 6This is a flowchart illustrating the communication control method according to the fifth embodiment;

[0022] Figure 7 Schematic diagram of the communication control device provided in the embodiments of this application Figure 1 ;

[0023] Figure 8 Schematic diagram of the communication control device provided in the embodiments of this application Figure 2 ;

[0024] Figure 9 Schematic diagram of the communication control device provided in the embodiments of this application Figure 3 .

[0025] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0027] Currently, in all handover types, serving cell changes are triggered by Layer 3 (L3) measurements and executed via Layer 3 RRC (Radio Resource Control) signaling to change the primary cell (PCell) and primary secondary cell (PSCell). All cases require reconfiguration of upper layers (e.g., PDCP (Packet Data Convergence Protocol) or RRC) and / or reset of lower layers (e.g., MAC (Media Access Control) and / or PHY (Physical Layer)). This results in longer latency, greater overhead, and longer downtime compared to beam-level mobility. Subsequently, Layer 1 (L1) / L2-based mobility, also known as Lower Layer Triggered Mobility (LTM), was introduced to enable serving cell changes via L1 or L2 signaling while maintaining upper-layer configuration and / or minimizing changes to lower-layer configuration. This helps reduce latency, overhead, and downtime during handover. LTM supports movement between different DUs within a Distributed Unit (DU) and between Centralized Units (CUs). During LTM, the user plane continues as much as possible (e.g., within the Distributed Unit) without requiring a reset, maintaining connectivity with the target cell to avoid data loss and additional data recovery delays. However, during LTM handover between different DUs, the target node (e.g., the target DU or target base station) that causes LTM handover failure or near failure may not receive the report from the User Equipment (UE) side triggered by the LTM failure or near failure, thus preventing the target node from optimizing the relevant LTM procedures or LTM configuration parameters.

[0028] To solve the above technical problems, refer to Figure 1 , Figure 1 This is a schematic diagram of the operating device structure of the hardware operating environment involved in the embodiments of this application.

[0029] like Figure 1As shown, the operating device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen or an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1005 may be a high-speed random access memory (RAM) or a stable non-volatile memory (NVM), such as a disk drive. The memory 1005 may also optionally be a storage device independent of the aforementioned processor 1001.

[0030] Those skilled in the art will understand that Figure 1 The structure shown does not constitute a limitation on the operating equipment and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0031] like Figure 1 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a data storage module, a network communication module, a user interface module, and computer programs.

[0032] exist Figure 1 In the illustrated operating device, the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and memory 1005 in the operating device of this application can be disposed in the operating device, and the operating device calls the computer program stored in the memory 1005 through the processor 1001 and performs the following operations:

[0033] Receive reports sent by the base station central unit;

[0034] If, based on the report, it is determined that the LTM handover failure or near failure is not related to itself, a first message is sent to the base station centralization unit, so that the base station centralization unit forwards the report to the target node according to the first message.

[0035] For example, the report may include a wireless link failure report or a successful handover report.

[0036] For example, the wireless link failure report is generated when an LTM handover failure occurs; the successful handover report is generated when an LTM handover near failure occurs.

[0037] For example, the wireless link failure report or successful handover report includes first indication information to indicate that the wireless link failure report or successful handover report was triggered by LTM handover.

[0038] For example, the first message includes second indication information, which indicates that the wireless link failure report is caused by an error from another node, or, the second indication information indicates that the successful handover report is caused by an error from another node, or, the second indication information indicates that the LTM handover failure is caused by an error from another node, or, the second indication information indicates that the LTM handover near failure is caused by an error from another node.

[0039] For example, the communication control method is applied to LTM handover in a primary cell group with dual connectivity between the terminal device and the network device, or to LTM handover with single connectivity between the terminal device and the network device.

[0040] For example, the report may include secondary cell group handover failure information or successful primary / secondary cell addition or change reports.

[0041] For example, the secondary cell group handover failure information is generated by LTM handover failure; the successful primary / secondary cell addition or change report is generated by LTM handover near failure.

[0042] For example, the secondary cell group handover failure information or successful primary / secondary cell addition or change report includes third indication information to indicate that the secondary cell group handover failure information or successful primary / secondary cell addition or change report was triggered by LTM handover.

[0043] For example, the second message includes fourth indication information, which is used to indicate that the secondary cell group handover failure information is caused by an error of other nodes, or, the fourth indication information is used to indicate that the successful primary / secondary cell addition or change report is caused by an error of other nodes, or, the fourth indication information is used to indicate that the LTM handover failure is caused by an error of other nodes, or, the fourth indication information is used to indicate that the LTM handover near failure is caused by an error of other nodes.

[0044] For example, processor 1001 may call a computer program stored in memory 1005 and also perform the following operations:

[0045] Based on the report, determine whether the LTM handover failure or near failure is related to itself;

[0046] If, based on the report, it is determined that the LTM handover failure or near-failure is related to itself, the LTM handover process and / or configuration parameters shall be optimized according to the report.

[0047] For example, the target node includes a target distribution unit or a target base station.

[0048] For example, processor 1001 may call a computer program stored in memory 1005 and also perform the following operations:

[0049] A report is sent to the base station distribution unit so that, if the base station distribution unit determines, based on the report, that the LTM handover failure or near failure is not related to itself, it sends a first message to the base station centralization unit.

[0050] Receive the first message and forward the report to the target node according to the first message.

[0051] For example, the report may include a wireless link failure report or a successful handover report.

[0052] For example, the wireless link failure report is generated when an LTM handover failure occurs; the successful handover report is generated when an LTM handover near failure occurs.

[0053] For example, the wireless link failure report or successful handover report includes first indication information to indicate that the wireless link failure report or successful handover report was triggered by LTM handover.

[0054] For example, the first message includes second indication information, which indicates that the wireless link failure report is caused by an error from another node, or, the second indication information indicates that the successful handover report is caused by an error from another node, or, the second indication information indicates that the LTM handover failure is caused by an error from another node, or, the second indication information indicates that the LTM handover near failure is caused by an error from another node.

[0055] For example, the communication control method is applied to LTM handover in a primary cell group with dual connectivity between the terminal device and the network device, or to LTM handover with single connectivity between the terminal device and the network device.

[0056] For example, the report may include secondary cell group handover failure information or successful primary / secondary cell addition or change reports.

[0057] For example, the secondary cell group handover failure information is generated by LTM handover failure; the successful primary / secondary cell addition or change report is generated by LTM handover near failure.

[0058] For example, the secondary cell group handover failure information or successful primary / secondary cell addition or change report includes third indication information to indicate that the secondary cell group handover failure information or successful primary / secondary cell addition or change report was triggered by LTM handover.

[0059] For example, the second message includes fourth indication information, which is used to indicate that the secondary cell group handover failure information is caused by an error of other nodes, or, the fourth indication information is used to indicate that the successful primary / secondary cell addition or change report is caused by an error of other nodes, or, the fourth indication information is used to indicate that the LTM handover failure is caused by an error of other nodes, or, the fourth indication information is used to indicate that the LTM handover near failure is caused by an error of other nodes.

[0060] For example, the target node includes a target distribution unit or a target base station.

[0061] For example, processor 1001 may call a computer program stored in memory 1005 and also perform the following operations:

[0062] Receive reports sent by the base station central unit;

[0063] If, based on the report, it is determined that the LTM handover failure or near-failure is related to itself, the LTM handover process and / or configuration parameters shall be optimized according to the report.

[0064] For example, the report may include a wireless link failure report or a successful handover report.

[0065] For example, the wireless link failure report is generated when an LTM handover failure occurs; the successful handover report is generated when an LTM handover near failure occurs.

[0066] For example, the wireless link failure report or successful handover report includes first indication information to indicate that the wireless link failure report or successful handover report was triggered by LTM handover.

[0067] For example, the communication control method is applied to LTM handover in a primary cell group with dual connectivity between the terminal device and the network device, or to LTM handover with single connectivity between the terminal device and the network device.

[0068] For example, the report may include secondary cell group handover failure information or successful primary / secondary cell addition or change reports.

[0069] For example, the secondary cell group handover failure information is generated by LTM handover failure; the successful primary / secondary cell addition or change report is generated by LTM handover near failure.

[0070] For example, the secondary cell group handover failure information or successful primary / secondary cell addition or change report includes third indication information to indicate that the secondary cell group handover failure information or successful primary / secondary cell addition or change report was triggered by LTM handover.

[0071] First Embodiment

[0072] Reference Figure 2 , Figure 2 The flowchart illustrating the communication control method according to the first embodiment is shown below. The communication control method of this application embodiment can be applied to a base station distribution unit, and the method includes:

[0073] Step S10: Receive a report sent by the base station central unit;

[0074] LTM (L1 / L2 triggered Mobility) handover aims to shorten terminal handover latency and interruption latency, and improve user experience. During LTM handover, handover failure or near failure may occur. Optimizing the LTM handover process and / or configuration parameters based on the reasons for LTM handover failure or near failure can optimize subsequent LTM handovers, thereby further reducing latency, overhead and interruption time during handover.

[0075] This application example illustrates the optimization of LTM handover for MCG (Master Cell group) and SCG (Secondary Cell group).

[0076] For example, during MCG LTM handover, if the UE experiences a handover failure, the UE records this failure in an RLF (Radio Link Failure) report. After reconnecting to the network, the UE sends an RLF report to the network. Alternatively, if the LTM handover to the target cell is successful, but due to some timer timeout, the LTM handover is close to failure (Nearby Failure), the UE records this near failure in an SHR (Successful Handover Report) report and sends an SHR report to the network. The base station central unit (CU) involved in the LTM failure receives the RLF or SHR report sent by the UE or forwarded by other base stations and sends the RLF or SHR report to the base station distribution unit (BDP), which then receives the RLF or SHR report.

[0077] For example, during SCG LTM handover, if the UE experiences a failure during the LTM handover, the UE records this LTM handover failure to an SCG Failure Information report and sends the SCG failure information (report) to the MN. Alternatively, if the LTM handover to the target PSCell is successful, but due to some timer timeout, this LTM handover is close to failure (Nearby Failure), the UE records this LTM near failure to a successful PSCell change / add Report (SPR) and sends an SPR report to the MN. Upon receiving the SCG failure information or SPR report from the UE, the MN determines that the SCG failure information or SPR report is due to the SCG LTM handover and forwards the SCG failure information or SPR report to the SN. The Base Station Central Unit (CU) on the SN receives the SCG failure information or SPR report and sends it to the Base Station Distribution Unit (PSU), which then receives the SCG failure information or SPR report.

[0078] Step S20: If, based on the report, it is determined that the LTM handover failure or near failure is not related to itself, a first message is sent to the base station centralization unit, so that the base station centralization unit forwards the report to the target node according to the first message.

[0079] During LTM handover, there may be various reasons for LTM handover failure or near failure. For example, the source DU receives Layer 1 measurements and determines the target cell and target beam based on the Layer 1 measurements and candidate cells / beams. The target cell or target beam determined by the source DU may be unsuitable, or the candidate beam list provided by the target DU may be inappropriate, or the TA (Time Advance) information on the candidate cells provided by the target DU may be inappropriate. Therefore, after receiving a report from the base station central unit (CU) regarding LTM handover failure or near failure, the base station distributed unit (source DU) needs to determine whether the LTM handover failure or near failure is related to itself based on the report.

[0080] For example, if the LTM handover failure or near failure is determined based on the report to be unrelated to itself, the base station distribution unit sends a first message to the base station central unit to indicate to the base station central unit that the LTM handover failure or near failure is caused by other nodes.

[0081] For example, when the base station central unit receives the first message from the base station distribution unit and learns from the first message that the LTM handover failure or near failure is caused by other nodes, it forwards the report involving LTM failure or near failure to the corresponding target node.

[0082] For example, the target node in this application embodiment may be a target distributed unit (target DU) that causes LTM handover failure or near failure, or a target base station that causes LTM handover failure or near failure.

[0083] For example, after receiving a report from the base station central unit regarding LTM failure or near failure, the target node can optimize the LTM handover process and / or configuration parameters based on the report.

[0084] This embodiment, through the above scheme, specifically involves receiving a report sent by the base station central unit; if, based on the report, it is determined that the LTM handover failure or near failure is not related to itself, a first message is sent to the base station central unit, so that the base station central unit forwards the report to the target node according to the first message. The base station distribution unit judges the received report sent by the base station central unit to determine whether the LTM handover failure or near failure is related to itself. Then, if the LTM handover failure or near failure is not related to itself, the first message is sent to the base station central unit, so that the base station central unit determines the target node that caused the LTM handover failure or near failure according to the first message, and then forwards the report to the corresponding target node, so that the target node that caused the LTM handover failure or near failure can successfully receive the report triggered by the LTM handover failure or near failure.

[0085] Second Embodiment

[0086] Reference Figure 3 , Figure 3 Based on the interactive timing diagram shown in the second embodiment, this embodiment further discloses an LTM handover optimization method in the MCG LTM handover process, building upon the aforementioned first embodiment.

[0087] For example, a User Equipment (UE) maintains dual connectivity (DC) with both the network master node (MN) and the network secondary node (SN). In this case, the network side configures the UE with a Layer 1 or Layer 2 Triggered Mobility (L1 / L2) configuration for the Master Cell Group (MCG). This configuration is limited to LTM handovers between primary cells (PCells) within the same MN node. In this case, the Next Generation NodeB (gNB) is the MN, and the UE maintains connectivity with the source primary cell on the gNB (i.e., the MN) (the source primary cell is on the source DU), while the candidate cell (i.e., the candidate primary cell) of the UE's LTM configuration is located on the target DU to which the gNB (MN) belongs. Alternatively, the UE maintains a single connectivity with a gNB, and the network side configures an LTM configuration for the UE that is limited to LTM handovers between cells within the same gNB node. At this time, the UE maintains a connection with the source cell on the gNB, while the candidate cell configured in the UE's LTM is located on the target DU to which the gNB belongs.

[0088] For example, in the LTM handover procedure, the UE reports Layer 1 measurements (L1 measurements) to the source DU. L1 measurements include the received quality of the configured LTM candidate cells and the received quality of the candidate beams configured for those candidate cells. Based on the L1 measurements, the source DU decides whether an LTM handover is needed, switching the UE's currently connected source cell or primary source cell (PCell) to a candidate cell to obtain better communication quality. If a handover is decided, the source DU determines the target cell on the target DU and the target beam of the target cell. The source DU sends a Layer 2 cell switch command (L2 CELL SWITCH COMMAND) to the UE, which may include the target cell indicated to the UE, the target beam of the target cell, and the TA (Time Advance) value of the target cell. Upon receiving the Layer 2 handover command, the UE, based on the pre-configured resources and parameters for the target cell in the LTM candidate cell configuration, directly switches to the resources of the target cell and enables the corresponding parameter configuration, and initiates the connection establishment process with the target cell on the target DU.

[0089] For example, during LTM handover in a primary cell group with dual connectivity between the terminal device (i.e., user equipment UE) and the network device, or during LTM handover in a single connectivity between the terminal device and the network device, reports involving LTM handover failure or near failure include radio link failure reports or successful handover reports.

[0090] For example, a radio link failure report is generated when the UE experiences a failure during the LTM handover process, such as losing connection with the source cell or the target cell. The UE records this LTM handover failure in an RLF (Radio link failure) report. After the UE reconnects to the network side, the UE sends an RLF report to the network side.

[0091] For example, a successful handover report is generated when an LTM handover near failure occurs. The LTM handover to the target cell is successful, but due to the timeout of some timers, this LTM handover near failure occurs. The UE records this LTM near failure to the SHR report (Successful Handover Report), and the UE sends the SHR report to the network side.

[0092] For example, a wireless link failure report or a successful handover report includes first indication information to indicate that the wireless link failure report or successful handover report was triggered by an LTM handover.

[0093] For example, the base station CU (Central Unit of the gNB) involved in the LTM handover failure or near failure receives an RLF or SHR report related to the UE forwarded by other base stations in the network, or receives an RLF or SHR report sent by the UE.

[0094] For example, the base station CU makes a judgment based on the UE-related RLF or SHR report. If it is determined that the LTM handover failure or near failure is caused by LTM, and this LTM failure or near failure involves the DU (e.g., the DU is responsible for the decision of the target cell and target beam), the base station CU forwards the RLF or SHR report to the source DU. The source DU then determines whether the LTM handover failure or near failure is related to itself. If the LTM handover failure or near failure is not related to itself, it sends a first message to the base station CU so that the base station CU forwards the report to the target node that caused the LTM handover failure or near failure, thereby enabling the target node to optimize the LTM process and parameter configuration.

[0095] In another implementation, the CU forwards the RLF or SHR report to both the source DU and the target DU simultaneously. In this implementation, the source DU and the target DU determine, based on the report, whether the LTM handover failure or near failure is related to themselves, and optimize the LTM process and parameter configuration accordingly, thus eliminating the need to send a first message to the base station CU. However, this method leads to unnecessary report forwarding on the interface, increasing the interface load, and is therefore suitable for scenarios with low interface load.

[0096] For example, if the source DU determines that the LTM failure or near failure is related to itself, such as the source DU receiving Layer 1 measurements and determining the target cell and target beam based on the Layer 1 measurements and candidate cells / candidate beams, the target cell or target beam determined by the source DU may be unsuitable. In this case, the source DU optimizes the LTM handover process and / or configuration parameters, that is, the source DU optimizes the subsequent LTM decision-making process.

[0097] For example, if the source DU determines that the LTM failure or near failure is caused by other nodes, such as due to an inappropriate candidate beam list provided by the target DU, or due to inappropriate TA (Time Advance) information on the candidate cells provided by the target DU, then the source DU sends a first message to the base station CU, such as an LTM failure transfer message, to indicate that the LTM handover failure or near failure is caused by other nodes.

[0098] For example, the first message includes second indication information, which indicates that the wireless link failure report is caused by an error from another node, or, the second indication information indicates that the successful handover report is caused by an error from another node, or, the second indication information indicates that the LTM handover failure is caused by an error from another node, or, the second indication information indicates that the LTM handover near failure is caused by an error from another node.

[0099] For example, the base station CU receives an LTM failure transmission message forwarded by the source DU, and learns from the message that the LTM failure or near failure is caused by other nodes. The CU then forwards the RLF or SHR report to the target node.

[0100] For example, the base station CU can determine the target node to which the target primary cell belongs by using the handover target primary cell identifier contained in the RLF or SHR report; or the CU can determine the target node to which the target primary cell belongs by using the target primary cell identifier contained in the cell handover notification message sent to the CU by the predefined source DU during the previous LTM handover process.

[0101] For example, in some MCG LTM handovers, cross-base station handovers may be supported. For instance, the source primary cell may be located in the source DU of the source base station, while the target primary cell may be located in another target base station. In this case, the CU will forward the RLF or SHR report to the target base station.

[0102] For example, when a target node receives an RLF or SHR report, it can determine that the LTM failure or near failure may be due to an inappropriate candidate beam list or inappropriate TA (Time Advance) information on the candidate cells it provides. The target node can then further optimize the relevant configuration parameters for subsequent LTM handover.

[0103] This embodiment, through the above-described scheme, specifically uses the base station distribution unit to determine whether the LTM handover failure or near failure is related to itself. If the LTM handover failure or near failure is not related to itself, it informs the base station central unit, so that the base station central unit sends the radio link failure report or successful handover report to the target node that caused the LTM handover failure or near failure. This achieves LTM optimization, ensuring that the target node causing the LTM handover failure or near failure during the MCG LTM handover process can receive the radio link failure report or successful handover report, thereby optimizing the LTM handover process and / or configuration parameters.

[0104] Third Embodiment

[0105] Reference Figure 4 , Figure 4 Based on the interactive timing diagram shown in the third embodiment, this embodiment further discloses an LTM handover optimization method in the SCG LTM handover process, building upon any of the foregoing embodiments.

[0106] For example, a User Equipment (UE) maintains dual connectivity (DC) with both the network master node (MN) and the network secondary node (SN). In this case, the network side configures the UE with a Layer 1 / L2-Triggered Mobility (LTM) configuration for the secondary cell group (SCG). This configuration is limited to LTM handover between primary and secondary cells (PSCells) within the same SN node. At this time, the UE maintains a connection with the primary cell on the MN and simultaneously maintains a connection with the source PSCell on the source DU on the SN, while the candidate PSCell of the UE's LTM configuration is located on the target DU to which the SN belongs.

[0107] For example, in the LTM handover procedure, the UE reports Layer 1 measurements (L1 measurements) to the source DU of the SN. L1 measurements include the received quality of the configured LTM candidate cells and the received quality of the candidate beams configured for those candidate cells. Based on the L1 measurements, the source DU determines whether an LTM handover is needed, switching the UE's currently connected source PSCell to a candidate PSCell to obtain better communication quality. If a handover is decided, the source DU determines the target PSCell on the target DU and the target beam of the target PSCell. The source DU sends a Layer 2 cell switch command (L2 CELL SWITCH COMMAND) to the UE, which may include the target cell indicated to the UE, the target beam of the target cell, and the TA value (Time Advance) of the target cell. Upon receiving the Layer 2 handover command, the UE directly switches to the resources of the target PSCell and enables the corresponding parameter configuration based on the resource and parameter configuration of the target PSCell in the pre-configured LTM candidate PSCell, and initiates the connection establishment process with the target PSCell on the target DU.

[0108] For example, during SCG LTM handover, reports involving LTM handover failure or near failure include secondary cell group handover failure information or reports of successful primary / secondary cell addition or modification.

[0109] For example, the secondary cell group handover failure information is generated by LTM handover failure. If the UE fails during the LTM handover process, such as losing connection with the source PSCell or the target PSCell, the UE records this LTM handover failure to the SCG Failure Information report and sends the SCG Failure Information report to the MN.

[0110] For example, a successful primary / secondary cell add or change report is generated when an LTM handover near failure occurs. The LTM handover to the target PSCell is successful, but due to some timer timeout, this LTM handover near failure occurs. The UE records this LTM near failure to a successful PSCell change / add report (SPR), and the UE sends the SPR report to the MN.

[0111] For example, the secondary cell group handover failure information or the successful primary / secondary cell addition or change report includes third indication information to indicate that the secondary cell group handover failure information or the successful primary / secondary cell addition or change report was triggered by LTM handover.

[0112] For example, when the MN receives an SCG failure message or SPR report from the UE, it determines that the SCG failure message or SPR report is caused by SCG LTM handover, and then forwards the SCG failure message or SPR report to the SN.

[0113] For example, when the CU on the SN receives an SCG failure message or an SPR report, if the CU determines that the failure is due to LTM and this LTM failure or near failure involves the DU (e.g., the DU is responsible for the decision of the target PSCell and the target beam), the CU forwards the SCG failure message or SPR report to the source DU. The source DU then determines whether the LTM handover failure or near failure is related to itself. If the LTM handover failure or near failure is not related to itself, it sends a second message to the CU so that the CU forwards the report to the target node that caused the LTM handover failure or near failure, thereby enabling the target node to optimize the LTM process and parameter configuration.

[0114] In another implementation, the CU forwards the SCG failure information or SPR report to both the source DU and the target DU. In this implementation, the source DU and the target DU determine, based on the report, whether the LTM handover failure or near failure is related to themselves, and optimize the LTM process and parameter configuration accordingly, thus eliminating the need to send a second message to the base station CU. However, this method leads to unnecessary report forwarding on the interface, increasing the interface load, and is therefore suitable for scenarios with low interface load.

[0115] For example, based on the received SCG failure information or SPR report, the source DU determines whether the LTM handover failure or near failure is related to itself in the following ways:

[0116] Based on the SCG failure information or the Layer 1 measurements at the time of LTM handover triggering contained in the SPR report, determine whether the target PSCell determined by itself is appropriate;

[0117] Based on the SCG failure information or the Layer 1 measurements at the time of LTM handover triggering contained in the SPR report, determine whether the target beam in the target PSCell determined by itself is appropriate.

[0118] Based on the SCG failure information or the re-established cell after the PSCell failure contained in the SPR report, determine whether the re-established cell has been accepted by the UE as a candidate target cell to be configured.

[0119] For example, if the source DU determines that the LTM failure or near failure is caused by itself, the source DU optimizes the subsequent LTM decision-making process or configuration parameters. For instance, the source DU optimizes the process of determining the target cell and target beam based on Layer 1 measurements, or the source DU optimizes the candidate target cell list that it has configured for the UE.

[0120] For example, if the source DU determines that the LTM failure or near failure is caused by other nodes, such as an inappropriate candidate beam list provided by the target DU, or an inappropriate TA (Time advance) information on the candidate PSCell provided by the target DU, then the source DU sends a second message to the CU, such as an LTM failure transfer message.

[0121] For example, the second message includes a fourth indication message, which indicates that the secondary cell group handover failure information is caused by an error of another node, or, the fourth indication message indicates that the successful primary / secondary cell addition or change report is caused by an error of another node, or, the fourth indication message indicates that the LTM handover failure is caused by an error of another node, or, the fourth indication message indicates that the LTM handover near failure is caused by an error of another node.

[0122] For example, the base station CU receives an LTM failure transmission message forwarded by the source DU, and learns from the message that the LTM failure or near failure is caused by other nodes. The CU then forwards the RLF or SHR report to the target node.

[0123] For example, the base station CU can determine the target DU to which the target primary and secondary cell belongs by the handover target primary and secondary cell identifier contained in the SCG failure information or the SPR report, or the CU can determine the target DU to which the target primary and secondary cell belongs by the target primary and secondary cell identifier contained in the cell handover notification message sent to the CU by the predefined source DU during the previous LTM handover process.

[0124] For example, in some SCG LTM handovers, cross-base station handovers may be supported. For instance, the source primary and secondary cells may be located in the source DU of the source base station, while the target primary and secondary cells may be located in other target base stations. In this case, the CU will forward the SCG failure information or SPR report to the target base station.

[0125] For example, if the target DU receives an SCG failure message or an SPR report, it can determine that the LTM failure or near failure may be due to an inappropriate candidate beam list or inappropriate TA (Time Advance) information on the candidate PSCell cell. The target DU can then further optimize the configuration parameters related to future LTM handovers.

[0126] This embodiment, through the above scheme, specifically uses the base station distribution unit to determine whether the LTM handover failure or near failure is related to itself based on secondary cell group handover failure information or successful primary / secondary cell addition or change reports. If the LTM handover failure or near failure is not related to itself, the base station central unit is notified so that the base station central unit can send the secondary cell group handover failure information or successful primary / secondary cell addition or change reports to the target node that caused the LTM handover failure or near failure, thereby achieving LTM optimization. This ensures that the target node that caused the LTM handover failure or near failure during the SCG LTM handover process can receive the secondary cell group handover failure information or successful primary / secondary cell addition or change reports, thus optimizing the LTM handover process and / or configuration parameters.

[0127] Fourth embodiment

[0128] Reference Figure 5 , Figure 5 The flowchart illustrating the communication control method according to the fourth embodiment is shown below. The communication control method of this application embodiment can be applied to a base station distribution unit, and the method includes:

[0129] Step A10: Receive the report sent by the base station central unit;

[0130] Step A10: If the LTM handover failure or near failure is determined to be related to itself based on the report, optimize the LTM handover process and / or configuration parameters according to the report.

[0131] For example, during MCG LTM handover, if the UE experiences a handover failure, the UE records this failure in an RLF (Radio Link Failure) report. After reconnecting to the network, the UE sends an RLF report to the network. Alternatively, if the LTM handover to the target cell is successful, but due to some timer timeout, the LTM handover is close to failure (Nearby Failure), the UE records this near failure in an SHR (Successful Handover Report) report and sends an SHR report to the network. The base station central unit (CU) involved in the LTM failure receives the RLF or SHR report sent by the UE or forwarded by other base stations and sends the RLF or SHR report to the base station distribution unit (BDP), which then receives the RLF or SHR report.

[0132] For example, during SCG LTM handover, if the UE experiences a failure during the LTM handover, the UE records this LTM handover failure to an SCG Failure Information report and sends the SCG failure information (report) to the MN. Alternatively, if the LTM handover to the target PSCell is successful, but due to some timer timeout, this LTM handover is close to failure (Nearby Failure), the UE records this LTM near failure to a successful PSCell change / add Report (SPR) and sends an SPR report to the MN. Upon receiving the SCG failure information or SPR report from the UE, the MN determines that the SCG failure information or SPR report is due to the SCG LTM handover and forwards the SCG failure information or SPR report to the SN. The Base Station Central Unit (CU) on the SN receives the SCG failure information or SPR report and sends it to the Base Station Distribution Unit (PSU), which then receives the SCG failure information or SPR report.

[0133] For example, during LTM handover in a primary cell group with dual connectivity between the terminal device (i.e., user equipment UE) and the network device, or during LTM handover in a single connectivity between the terminal device and the network device, reports involving LTM handover failure or near failure include radio link failure reports or successful handover reports.

[0134] For example, a radio link failure report is generated when the UE experiences a failure during the LTM handover process, such as losing connection with the source cell or the target cell. The UE records this LTM handover failure in an RLF (Radio link failure) report. After the UE reconnects to the network side, the UE sends an RLF report to the network side.

[0135] For example, a successful handover report is generated when an LTM handover near failure occurs. The LTM handover to the target cell is successful, but due to the timeout of some timers, this LTM handover near failure occurs. The UE records this LTM near failure to the SHR report (Successful Handover Report), and the UE sends the SHR report to the network side.

[0136] For example, a wireless link failure report or a successful handover report includes first indication information to indicate that the wireless link failure report or successful handover report was triggered by an LTM handover.

[0137] For example, the base station CU (Central Unit of the gNB) involved in the LTM handover failure or near failure receives an RLF or SHR report related to the UE forwarded by other base stations in the network, or receives an RLF or SHR report sent by the UE.

[0138] For example, the base station CU makes a judgment based on the UE-related RLF or SHR report. If it is determined that the LTM handover failure or near failure is caused by LTM, and this LTM failure or near failure involves the DU (e.g., the DU is responsible for the decision of the target cell and target beam), the base station CU forwards the RLF or SHR report to the source DU. The source DU then determines whether the LTM handover failure or near failure is related to itself. If the LTM handover failure or near failure is not related to itself, it sends a first message to the base station CU so that the base station CU forwards the report to the target node that caused the LTM handover failure or near failure, thereby enabling the target node to optimize the LTM process and parameter configuration.

[0139] For example, if the source DU determines that the LTM failure or near failure is related to itself, such as the source DU receiving Layer 1 measurements and determining the target cell and target beam based on the Layer 1 measurements and candidate cells / candidate beams, the target cell or target beam determined by the source DU may be unsuitable. In this case, the source DU optimizes the LTM handover process and / or configuration parameters, that is, the source DU optimizes the subsequent LTM decision-making process.

[0140] For example, during SCG LTM handover, reports involving LTM handover failure or near failure include secondary cell group handover failure information or reports of successful primary / secondary cell addition or modification.

[0141] For example, the secondary cell group handover failure information is generated by LTM handover failure. If the UE fails during the LTM handover process, such as losing connection with the source PSCell or the target PSCell, the UE records this LTM handover failure to the SCG Failure Information report and sends the SCG Failure Information report to the MN.

[0142] For example, a successful primary / secondary cell add or change report is generated when an LTM handover near failure occurs. The LTM handover to the target PSCell is successful, but due to some timer timeout, this LTM handover near failure occurs. The UE records this LTM near failure to a successful PSCell change / add report (SPR), and the UE sends the SPR report to the MN.

[0143] For example, the secondary cell group handover failure information or the successful primary / secondary cell addition or change report includes third indication information to indicate that the secondary cell group handover failure information or the successful primary / secondary cell addition or change report was triggered by LTM handover.

[0144] For example, when the MN receives an SCG failure message or SPR report from the UE, it determines that the SCG failure message or SPR report is caused by SCG LTM handover, and then forwards the SCG failure message or SPR report to the SN.

[0145] For example, when the CU on the SN receives an SCG failure message or an SPR report, if the CU determines that the failure is due to LTM and this LTM failure or near failure involves the DU (e.g., the DU is responsible for the decision of the target PSCell and the target beam), the CU forwards the SCG failure message or SPR report to the source DU. The source DU then determines whether the LTM handover failure or near failure is related to itself. If the LTM handover failure or near failure is not related to itself, it sends a second message to the CU so that the CU forwards the report to the target node that caused the LTM handover failure or near failure, thereby enabling the target node to optimize the LTM process and parameter configuration.

[0146] For example, based on the received SCG failure information or SPR report, the source DU determines whether the LTM handover failure or near failure is related to itself in the following ways:

[0147] Based on the SCG failure information or the Layer 1 measurements at the time of LTM handover triggering contained in the SPR report, determine whether the target PSCell determined by itself is appropriate;

[0148] Based on the SCG failure information or the Layer 1 measurements at the time of LTM handover triggering contained in the SPR report, determine whether the target beam in the target PSCell determined by itself is appropriate.

[0149] Based on the SCG failure information or the re-established cell after the PSCell failure contained in the SPR report, determine whether the re-established cell has been accepted by the UE as a candidate target cell to be configured.

[0150] For example, if the source DU determines that the LTM failure or near failure is caused by itself, the source DU optimizes the subsequent LTM decision-making process or configuration parameters. For instance, the source DU optimizes the process of determining the target cell and target beam based on Layer 1 measurements, or the source DU optimizes the candidate target cell list that it has configured for the UE.

[0151] This embodiment, through the above-described scheme, specifically involves receiving reports sent by the base station central unit; if, based on the report, it is determined that the LTM handover failure or near failure is related to itself, the LTM handover process and / or configuration parameters are optimized according to the report. The base station distribution unit judges the reports sent by the base station central unit to determine whether the LTM handover failure or near failure is related to itself, and then optimizes the LTM handover process and / or configuration parameters if the LTM handover failure or near failure is related to itself, thereby reducing latency, overhead, and interruption time during LTM handover and improving user experience.

[0152] Fifth Embodiment

[0153] Reference Figure 6 , Figure 6 The flowchart illustrating the communication control method according to the fifth embodiment is shown below. The communication control method of this application embodiment can be applied to a base station centralization unit, and the method includes:

[0154] Step B10: Send a report to the base station distribution unit so that the base station distribution unit, based on the report, determines that the LTM handover failure or near failure is not related to itself, and sends a first message to the base station centralization unit.

[0155] Step B20: Receive the first message and forward the report to the target node according to the first message.

[0156] LTM handover aims to shorten terminal handover latency and interruption latency, and improve user experience. During LTM handover, handover failure or near failure may occur. Optimizing the LTM handover process and / or configuration parameters based on the reasons for LTM handover failure or near failure can optimize subsequent LTM handovers, thereby further reducing latency, overhead and interruption time during handover.

[0157] This application example illustrates the optimization of LTM handover for MCG (Master Cell group) and SCG (Secondary Cell group).

[0158] For example, during MCG LTM handover, if the UE experiences a handover failure, the UE records this failure in an RLF (Radio Link Failure) report. After reconnecting to the network, the UE sends an RLF report to the network. Alternatively, if the LTM handover to the target cell is successful, but due to some timer timeout, the LTM handover is close to failure (Nearby Failure), the UE records this near failure in an SHR (Successful Handover Report) report and sends an SHR report to the network. The base station central unit (CU) involved in the LTM failure receives the RLF or SHR report sent by the UE or forwarded by other base stations and sends the RLF or SHR report to the base station distribution unit (BDP), which then receives the RLF or SHR report.

[0159] For example, during SCG LTM handover, if the UE experiences a failure during the LTM handover, the UE records this LTM handover failure to an SCG Failure Information report and sends the SCG failure information (report) to the MN. Alternatively, if the LTM handover to the target PSCell is successful, but due to some timer timeout, this LTM handover is close to failure (Nearby Failure), the UE records this LTM near failure to a successful PSCell change / add Report (SPR) and sends an SPR report to the MN. Upon receiving the SCG failure information or SPR report from the UE, the MN determines that the SCG failure information or SPR report is due to the SCG LTM handover and forwards the SCG failure information or SPR report to the SN. The Base Station Central Unit (CU) on the SN receives the SCG failure information or SPR report and sends it to the Base Station Distribution Unit (PSU), which then receives the SCG failure information or SPR report.

[0160] During LTM handover, there may be various reasons for LTM handover failure or near failure. For example, the source DU receives Layer 1 measurements and determines the target cell and target beam based on the Layer 1 measurements and candidate cells / beams. The target cell or target beam determined by the source DU may be unsuitable, or the candidate beam list provided by the target DU may be inappropriate, or the TA (Time Advance) information on the candidate cells provided by the target DU may be inappropriate. Therefore, after receiving a report from the base station central unit (CU) regarding LTM handover failure or near failure, the base station distributed unit (source DU) needs to determine whether the LTM handover failure or near failure is related to itself based on the report.

[0161] For example, if the LTM handover failure or near failure is determined based on the report to be unrelated to itself, the base station distribution unit sends a first message to the base station central unit to indicate to the base station central unit that the LTM handover failure or near failure is caused by other nodes.

[0162] For example, when the base station central unit receives the first message from the base station distribution unit and learns from the first message that the LTM handover failure or near failure is caused by other nodes, it forwards the report involving LTM failure or near failure to the corresponding target node.

[0163] For example, the target node in this application embodiment may be a target distributed unit (target DU) that causes LTM handover failure or near failure, or a target base station that causes LTM handover failure or near failure.

[0164] For example, after receiving a report from the base station central unit regarding LTM failure or near failure, the target node can optimize the LTM handover process and / or configuration parameters based on the report.

[0165] For example, during LTM handover in a primary cell group with dual connectivity between the terminal device (i.e., user equipment UE) and the network device, or during LTM handover in a single connectivity between the terminal device and the network device, reports involving LTM handover failure or near failure include radio link failure reports or successful handover reports.

[0166] For example, a radio link failure report is generated when the UE experiences a failure during the LTM handover process, such as losing connection with the source cell or the target cell. The UE records this LTM handover failure in an RLF (Radio link failure) report. After the UE reconnects to the network side, the UE sends an RLF report to the network side.

[0167] For example, a successful handover report is generated when an LTM handover near failure occurs. The LTM handover to the target cell is successful, but due to the timeout of some timers, this LTM handover near failure occurs. The UE records this LTM near failure to the SHR report (Successful Handover Report), and the UE sends the SHR report to the network side.

[0168] For example, a wireless link failure report or a successful handover report includes first indication information to indicate that the wireless link failure report or successful handover report was triggered by an LTM handover.

[0169] For example, the base station CU (Central Unit of the gNB) involved in the LTM handover failure or near failure receives an RLF or SHR report related to the UE forwarded by other base stations in the network, or receives an RLF or SHR report sent by the UE.

[0170] For example, the base station CU makes a judgment based on the UE-related RLF or SHR report. If it is determined that the LTM handover failure or near failure is caused by LTM, and this LTM failure or near failure involves the DU (e.g., the DU is responsible for the decision of the target cell and target beam), the base station CU forwards the RLF or SHR report to the source DU. The source DU then determines whether the LTM handover failure or near failure is related to itself. If the LTM handover failure or near failure is not related to itself, it sends a first message to the base station CU so that the base station CU forwards the report to the target node that caused the LTM handover failure or near failure, thereby enabling the target node to optimize the LTM process and parameter configuration.

[0171] In another implementation, the CU forwards the RLF or SHR report to both the source DU and the target DU simultaneously. In this implementation, the source DU and the target DU determine, based on the report, whether the LTM handover failure or near failure is related to themselves, and optimize the LTM process and parameter configuration accordingly, thus eliminating the need to send a first message to the base station CU. However, this method leads to unnecessary report forwarding on the interface, increasing the interface load, and is therefore suitable for scenarios with low interface load.

[0172] For example, if the source DU determines that the LTM failure or near failure is related to itself, such as the source DU receiving Layer 1 measurements and determining the target cell and target beam based on the Layer 1 measurements and candidate cells / candidate beams, the target cell or target beam determined by the source DU may be unsuitable. In this case, the source DU optimizes the LTM handover process and / or configuration parameters, that is, the source DU optimizes the subsequent LTM decision-making process.

[0173] For example, if the source DU determines that the LTM failure or near failure is caused by other nodes, such as due to an inappropriate candidate beam list provided by the target DU, or due to inappropriate TA (Time Advance) information on the candidate cells provided by the target DU, then the source DU sends a first message to the base station CU, such as an LTM failure transfer message, to indicate that the LTM handover failure or near failure is caused by other nodes.

[0174] For example, the first message includes second indication information, which indicates that the wireless link failure report is caused by an error from another node, or, the second indication information indicates that the successful handover report is caused by an error from another node, or, the second indication information indicates that the LTM handover failure is caused by an error from another node, or, the second indication information indicates that the LTM handover near failure is caused by an error from another node.

[0175] For example, the base station CU receives an LTM failure transmission message forwarded by the source DU, and learns from the message that the LTM failure or near failure is caused by other nodes. The CU then forwards the RLF or SHR report to the target node.

[0176] For example, the base station CU can determine the target node to which the target primary cell belongs by using the handover target primary cell identifier contained in the RLF or SHR report; or the CU can determine the target node to which the target primary cell belongs by using the target primary cell identifier contained in the cell handover notification message sent to the CU by the predefined source DU during the previous LTM handover process.

[0177] For example, in some MCG LTM handovers, cross-base station handovers may be supported. For instance, the source primary cell may be located in the source DU of the source base station, while the target primary cell may be located in another target base station. In this case, the CU will forward the RLF or SHR report to the target base station.

[0178] For example, when a target node receives an RLF or SHR report, it can determine that the LTM failure or near failure may be due to an inappropriate candidate beam list or inappropriate TA (Time Advance) information on the candidate cells it provides. The target node can then further optimize the relevant configuration parameters for subsequent LTM handover.

[0179] For example, during SCG LTM handover, reports involving LTM handover failure or near failure include secondary cell group handover failure information or reports of successful primary / secondary cell addition or modification.

[0180] For example, the secondary cell group handover failure information is generated by LTM handover failure. If the UE fails during the LTM handover process, such as losing connection with the source PSCell or the target PSCell, the UE records this LTM handover failure to the SCG Failure Information report and sends the SCG Failure Information report to the MN.

[0181] For example, a successful primary / secondary cell add or change report is generated when an LTM handover near failure occurs. The LTM handover to the target PSCell is successful, but due to some timer timeout, this LTM handover near failure occurs. The UE records this LTM near failure to a successful PSCell change / add report (SPR), and the UE sends the SPR report to the MN.

[0182] For example, the secondary cell group handover failure information or the successful primary / secondary cell addition or change report includes third indication information to indicate that the secondary cell group handover failure information or the successful primary / secondary cell addition or change report was triggered by LTM handover.

[0183] For example, when the MN receives an SCG failure message or SPR report from the UE, it determines that the SCG failure message or SPR report is caused by SCG LTM handover, and then forwards the SCG failure message or SPR report to the SN.

[0184] For example, when the CU on the SN receives an SCG failure message or an SPR report, if the CU determines that the failure is due to LTM and this LTM failure or near failure involves the DU (e.g., the DU is responsible for the decision of the target PSCell and the target beam), the CU forwards the SCG failure message or SPR report to the source DU. The source DU then determines whether the LTM handover failure or near failure is related to itself. If the LTM handover failure or near failure is not related to itself, it sends a second message to the CU so that the CU forwards the report to the target node that caused the LTM handover failure or near failure, thereby enabling the target node to optimize the LTM process and parameter configuration.

[0185] In another implementation, the CU forwards the SCG failure information or SPR report to both the source DU and the target DU. In this implementation, the source DU and the target DU determine, based on the report, whether the LTM handover failure or near failure is related to themselves, and optimize the LTM process and parameter configuration accordingly, thus eliminating the need to send a second message to the base station CU. However, this method leads to unnecessary report forwarding on the interface, increasing the interface load, and is therefore suitable for scenarios with low interface load.

[0186] For example, based on the received SCG failure information or SPR report, the source DU determines whether the LTM handover failure or near failure is related to itself in the following ways:

[0187] Based on the SCG failure information or the Layer 1 measurements at the time of LTM handover triggering contained in the SPR report, determine whether the target PSCell determined by itself is appropriate;

[0188] Based on the SCG failure information or the Layer 1 measurements at the time of LTM handover triggering contained in the SPR report, determine whether the target beam in the target PSCell determined by itself is appropriate.

[0189] Based on the SCG failure information or the re-established cell after the PSCell failure contained in the SPR report, determine whether the re-established cell has been accepted by the UE as a candidate target cell to be configured.

[0190] For example, if the source DU determines that the LTM failure or near failure is caused by itself, the source DU optimizes the subsequent LTM decision-making process or configuration parameters. For instance, the source DU optimizes the process of determining the target cell and target beam based on Layer 1 measurements, or the source DU optimizes the candidate target cell list that it has configured for the UE.

[0191] For example, if the source DU determines that the LTM failure or near failure is caused by other nodes, such as an inappropriate candidate beam list provided by the target DU, or an inappropriate TA (Time advance) information on the candidate PSCell provided by the target DU, then the source DU sends a second message to the CU, such as an LTM failure transfer message.

[0192] For example, the second message includes a fourth indication message, which indicates that the secondary cell group handover failure information is caused by an error of another node, or, the fourth indication message indicates that the successful primary / secondary cell addition or change report is caused by an error of another node, or, the fourth indication message indicates that the LTM handover failure is caused by an error of another node, or, the fourth indication message indicates that the LTM handover near failure is caused by an error of another node.

[0193] For example, the base station CU receives an LTM failure transmission message forwarded by the source DU, and learns from the message that the LTM failure or near failure is caused by other nodes. The CU then forwards the RLF or SHR report to the target node.

[0194] For example, the base station CU can determine the target DU to which the target primary and secondary cell belongs by the handover target primary and secondary cell identifier contained in the SCG failure information or the SPR report, or the CU can determine the target DU to which the target primary and secondary cell belongs by the target primary and secondary cell identifier contained in the cell handover notification message sent to the CU by the predefined source DU during the previous LTM handover process.

[0195] For example, in some SCG LTM handovers, cross-base station handovers may be supported. For instance, the source primary and secondary cells may be located in the source DU of the source base station, while the target primary and secondary cells may be located in other target base stations. In this case, the CU will forward the SCG failure information or SPR report to the target base station.

[0196] For example, if the target DU receives an SCG failure message or an SPR report, it can determine that the LTM failure or near failure may be due to an inappropriate candidate beam list or inappropriate TA (Time Advance) information on the candidate PSCell cell. The target DU can then further optimize the configuration parameters related to future LTM handovers.

[0197] In this embodiment, the above-described scheme involves the base station central unit sending a report to the base station distribution unit. If the base station distribution unit determines, based on the report, that the LTM handover failure or near-failure is unrelated to itself, it sends a first message to the base station central unit. Upon receiving the first message, the base station distribution unit forwards the report to the target node. The base station distribution unit then judges the received report from the base station central unit to determine whether the LTM handover failure or near-failure is related to itself. If the LTM handover failure or near-failure is unrelated to itself, it sends the first message to the base station central unit. The base station central unit then determines the target node that caused the LTM handover failure or near-failure based on the first message and forwards the report to the corresponding target node, ensuring that the target node causing the LTM handover failure or near-failure can successfully receive the report triggered by the LTM handover failure or near-failure.

[0198] Sixth Embodiment

[0199] Reference Figure 7 , Figure 7 Schematic diagram of the communication control device provided in the embodiments of this application Figure 1 The device can be mounted on or is the terminal device in the above method embodiments. Figure 7 The communication control device shown can be used to perform some or all of the functions described in the method embodiments above. For example... Figure 7 As shown, the communication control device includes:

[0200] The first receiving module is used to receive reports sent by the base station central unit;

[0201] The first sending module is configured to send a first message to the base station centralization unit when it is determined from the report that the LTM handover failure or near failure is not related to itself, so that the base station centralization unit forwards the report to the target node according to the first message.

[0202] For example, the report may include a wireless link failure report or a successful handover report.

[0203] For example, the wireless link failure report is generated when an LTM handover failure occurs; the successful handover report is generated when an LTM handover near failure occurs.

[0204] For example, the wireless link failure report or successful handover report includes first indication information to indicate that the wireless link failure report or successful handover report was triggered by LTM handover.

[0205] For example, the first message includes second indication information, which indicates that the wireless link failure report is caused by an error from another node, or, the second indication information indicates that the successful handover report is caused by an error from another node, or, the second indication information indicates that the LTM handover failure is caused by an error from another node, or, the second indication information indicates that the LTM handover near failure is caused by an error from another node.

[0206] For example, the communication control device is applied to LTM handover in a primary cell group with dual connections between terminal equipment and network equipment, or to LTM handover with single connection between terminal equipment and network equipment.

[0207] For example, the report may include secondary cell group handover failure information or successful primary / secondary cell addition or change reports.

[0208] For example, the secondary cell group handover failure information is generated by LTM handover failure; the successful primary / secondary cell addition or change report is generated by LTM handover near failure.

[0209] For example, the secondary cell group handover failure information or successful primary / secondary cell addition or change report includes third indication information to indicate that the secondary cell group handover failure information or successful primary / secondary cell addition or change report was triggered by LTM handover.

[0210] For example, the second message includes fourth indication information, which is used to indicate that the secondary cell group handover failure information is caused by an error of other nodes, or, the fourth indication information is used to indicate that the successful primary / secondary cell addition or change report is caused by an error of other nodes, or, the fourth indication information is used to indicate that the LTM handover failure is caused by an error of other nodes, or, the fourth indication information is used to indicate that the LTM handover near failure is caused by an error of other nodes.

[0211] For example, the communication control device further includes a judgment module, which is used to determine whether the LTM handover failure or near failure is related to itself based on the report; if it is determined based on the report that the LTM handover failure or near failure is related to itself, the judgment module optimizes the LTM handover process and / or configuration parameters according to the report.

[0212] For example, the target node includes a target distribution unit or a target base station.

[0213] The communication control device provided in this application embodiment is similar in implementation principle and beneficial effect to the technical solution shown in the corresponding method embodiment above, and will not be described again here.

[0214] Seventh Embodiment

[0215] Reference Figure 8 , Figure 8 Schematic diagram of the communication control device provided in the embodiments of this application Figure 2 The device can be mounted on or is the terminal device in the above method embodiments. Figure 8 The communication control device shown can be used to perform some or all of the functions described in the method embodiments above. For example... Figure 8 As shown, the communication control device includes:

[0216] The second sending module is used to send a report to the base station distribution unit, so that the base station distribution unit, based on the report, determines that the LTM handover failure or near failure is not related to itself, and sends a first message to the base station centralization unit.

[0217] The second receiving module is used to receive the first message and forward the report to the target node according to the first message.

[0218] For example, the report may include a wireless link failure report or a successful handover report.

[0219] For example, the wireless link failure report is generated when an LTM handover failure occurs; the successful handover report is generated when an LTM handover near failure occurs.

[0220] For example, the wireless link failure report or successful handover report includes first indication information to indicate that the wireless link failure report or successful handover report was triggered by LTM handover.

[0221] For example, the first message includes second indication information, which indicates that the wireless link failure report is caused by an error from another node, or, the second indication information indicates that the successful handover report is caused by an error from another node, or, the second indication information indicates that the LTM handover failure is caused by an error from another node, or, the second indication information indicates that the LTM handover near failure is caused by an error from another node.

[0222] For example, the communication control device is applied to LTM handover in a primary cell group with dual connections between terminal equipment and network equipment, or to LTM handover with single connection between terminal equipment and network equipment.

[0223] For example, the report may include secondary cell group handover failure information or successful primary / secondary cell addition or change reports.

[0224] For example, the secondary cell group handover failure information is generated by LTM handover failure; the successful primary / secondary cell addition or change report is generated by LTM handover near failure.

[0225] For example, the secondary cell group handover failure information or successful primary / secondary cell addition or change report includes third indication information to indicate that the secondary cell group handover failure information or successful primary / secondary cell addition or change report was triggered by LTM handover.

[0226] For example, the second message includes fourth indication information, which is used to indicate that the secondary cell group handover failure information is caused by an error of other nodes, or, the fourth indication information is used to indicate that the successful primary / secondary cell addition or change report is caused by an error of other nodes, or, the fourth indication information is used to indicate that the LTM handover failure is caused by an error of other nodes, or, the fourth indication information is used to indicate that the LTM handover near failure is caused by an error of other nodes.

[0227] For example, the target node includes a target distribution unit or a target base station.

[0228] The communication control device provided in this application embodiment is similar in implementation principle and beneficial effect to the technical solution shown in the corresponding method embodiment above, and will not be described again here.

[0229] Eighth embodiment

[0230] Reference Figure 9 , Figure 9 Schematic diagram of the communication control device provided in the embodiments of this application Figure 3 The device can be mounted on or is the terminal device in the above method embodiments. Figure 9 The communication control device shown can be used to perform some or all of the functions described in the method embodiments above. For example... Figure 9 As shown, the communication control device includes:

[0231] The third receiving module is used to receive reports sent by the base station central unit;

[0232] The optimization module is used to optimize the LTM switching process and / or configuration parameters based on the report if it is determined that the LTM switching failure or near failure is related to itself.

[0233] For example, the report may include a wireless link failure report or a successful handover report.

[0234] For example, the wireless link failure report is generated when an LTM handover failure occurs; the successful handover report is generated when an LTM handover near failure occurs.

[0235] For example, the wireless link failure report or successful handover report includes first indication information to indicate that the wireless link failure report or successful handover report was triggered by LTM handover.

[0236] For example, the communication control method is applied to LTM handover in a primary cell group with dual connectivity between the terminal device and the network device, or to LTM handover with single connectivity between the terminal device and the network device.

[0237] For example, the report may include secondary cell group handover failure information or successful primary / secondary cell addition or change reports.

[0238] For example, the secondary cell group handover failure information is generated by LTM handover failure; the successful primary / secondary cell addition or change report is generated by LTM handover near failure.

[0239] For example, the secondary cell group handover failure information or successful primary / secondary cell addition or change report includes third indication information to indicate that the secondary cell group handover failure information or successful primary / secondary cell addition or change report was triggered by LTM handover.

[0240] The processing device provided in this application embodiment is similar in implementation principle and beneficial effect to the technical solution shown in the corresponding method embodiment above, and will not be described again here.

[0241] Furthermore, embodiments of this application also provide a network device, the network device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the communication control method as described above.

[0242] Furthermore, this application embodiment also provides a storage medium, which is a computer-readable storage medium, and stores a computer program thereon. When the computer program is executed by a processor, it implements the steps of the communication control method described above.

[0243] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0244] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0245] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A communication control method, characterized in that, Applied to base station distribution units, including: Receive reports sent by the base station central unit; If, based on the report, it is determined that the LTM handover failure or near failure is not related to itself, a first message is sent to the base station centralization unit, so that the base station centralization unit forwards the report to the target node according to the first message.

2. The communication control method according to claim 1, characterized in that, The report includes wireless link failure reports or successful handover reports.

3. The communication control method according to claim 2, characterized in that, The wireless link failure report is generated when the LTM handover fails; the successful handover report is generated when the LTM handover is close to failure.

4. The communication control method according to claim 2, characterized in that, The wireless link failure report or successful handover report includes first indication information to indicate that the wireless link failure report or successful handover report was triggered by LTM handover.

5. The communication control method according to claim 3, characterized in that, The first message includes second indication information, which indicates that the wireless link failure report is caused by an error from another node, or that the successful handover report is caused by an error from another node, or that the LTM handover failure is caused by an error from another node, or that the LTM handover near failure is caused by an error from another node.

6. The communication control method according to claim 2, characterized in that, The communication control method is applied to LTM handover in a primary cell group with dual connections between terminal equipment and network equipment, or to LTM handover with single connections between terminal equipment and network equipment.

7. The communication control method according to claim 1, characterized in that, The report includes information on failed secondary cell group handovers or reports of successful additions or changes to primary and secondary cells.

8. The communication control method according to claim 7, characterized in that, The secondary cell group handover failure information is generated by LTM handover failure; the successful primary / secondary cell addition or change report is generated by LTM handover near failure.

9. The communication control method according to claim 7, characterized in that, The secondary cell group handover failure information or successful primary / secondary cell addition or change report includes a third indication information, which indicates that the secondary cell group handover failure information or successful primary / secondary cell addition or change report was triggered by LTM handover.

10. The communication control method according to claim 8, characterized in that, The second message contains a fourth indication, which indicates that the secondary cell group handover failure was caused by an error in another node, or that the successful primary / secondary cell addition or change report was caused by an error in another node, or that the LTM handover failure was caused by an error in another node, or that the LTM handover near failure was caused by an error in another node.

11. The communication control method according to claim 1, characterized in that, The step of receiving the report sent by the base station central unit further includes: Based on the report, determine whether the LTM handover failure or near failure is related to itself; If, based on the report, it is determined that the LTM handover failure or near-failure is related to itself, the LTM handover process and / or configuration parameters shall be optimized according to the report.

12. The communication control method according to claim 1, characterized in that, The target node includes a target distribution unit or a target base station.

13. A communication control method, characterized in that, Applied to base station centralization units, including: A report is sent to the base station distribution unit so that, if the base station distribution unit determines, based on the report, that the LTM handover failure or near failure is not related to itself, it sends a first message to the base station centralization unit. Receive the first message and forward the report to the target node according to the first message.

14. The communication control method according to claim 13, characterized in that, The report includes wireless link failure reports or successful handover reports.

15. The communication control method according to claim 14, characterized in that, The wireless link failure report is generated when the LTM handover fails; the successful handover report is generated when the LTM handover is close to failure.

16. The communication control method according to claim 14, characterized in that, The wireless link failure report or successful handover report includes first indication information to indicate that the wireless link failure report or successful handover report was triggered by LTM handover.

17. The communication control method according to claim 15, characterized in that, The first message includes second indication information, which indicates that the wireless link failure report is caused by an error from another node, or that the successful handover report is caused by an error from another node, or that the LTM handover failure is caused by an error from another node, or that the LTM handover near failure is caused by an error from another node.

18. The communication control method according to claim 14, characterized in that, The communication control method is applied to LTM handover in a primary cell group with dual connections between terminal equipment and network equipment, or to LTM handover with single connections between terminal equipment and network equipment.

19. The communication control method according to claim 13, characterized in that, The report includes information on failed secondary cell group handovers or reports of successful additions or changes to primary and secondary cells.

20. The communication control method according to claim 19, characterized in that, The secondary cell group handover failure information is generated by LTM handover failure; the successful primary / secondary cell addition or change report is generated by LTM handover near failure.

21. The communication control method according to claim 19, characterized in that, The secondary cell group handover failure information or successful primary / secondary cell addition or change report includes a third indication information, which indicates that the secondary cell group handover failure information or successful primary / secondary cell addition or change report was triggered by LTM handover.

22. The communication control method according to claim 20, characterized in that, The second message contains a fourth indication, which indicates that the secondary cell group handover failure was caused by an error in another node, or that the successful primary / secondary cell addition or change report was caused by an error in another node, or that the LTM handover failure was caused by an error in another node, or that the LTM handover near failure was caused by an error in another node.

23. The communication control method according to claim 13, characterized in that, The target node includes a target distribution unit or a target base station.

24. A communication control method, characterized in that, Applied to base station distribution units, including: Receive reports sent by the base station central unit; If, based on the report, it is determined that the LTM handover failure or near-failure is related to itself, the LTM handover process and / or configuration parameters shall be optimized according to the report.

25. The communication control method according to claim 24, characterized in that, The report includes wireless link failure reports or successful handover reports.

26. The communication control method according to claim 25, characterized in that, The wireless link failure report is generated when the LTM handover fails; the successful handover report is generated when the LTM handover is close to failure.

27. The communication control method according to claim 25, characterized in that, The wireless link failure report or successful handover report includes first indication information to indicate that the wireless link failure report or successful handover report was triggered by LTM handover.

28. The communication control method according to claim 25, characterized in that, The communication control method is applied to LTM handover in a primary cell group with dual connections between terminal equipment and network equipment, or to LTM handover with single connections between terminal equipment and network equipment.

29. The communication control method according to claim 24, characterized in that, The report includes information on failed secondary cell group handovers or reports of successful additions or changes to primary and secondary cells.

30. The communication control method according to claim 29, characterized in that, The secondary cell group handover failure information is generated by LTM handover failure; the successful primary / secondary cell addition or change report is generated by LTM handover near failure.

31. The communication control method according to claim 29, characterized in that, The secondary cell group handover failure information or successful primary / secondary cell addition or change report includes a third indication information, which indicates that the secondary cell group handover failure information or successful primary / secondary cell addition or change report was triggered by LTM handover.

32. A network device, characterized in that, The network device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the communication control method as claimed in any one of claims 1 to 12, or the communication control method as claimed in any one of claims 13 to 23, or the communication control method as claimed in any one of claims 24 to 31.

33. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the communication control method as described in any one of claims 1 to 12, or the communication control method as described in any one of claims 13 to 23, or the communication control method as described in any one of claims 24 to 31.

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