WO2025031352A1 - Handover information reporting method and user equipment - Google Patents

Abstract

The present disclosure provides a handover information reporting method and a user equipment (UE). The handover information reporting method comprises: a UE receives from a network side a successful handover report (SHR) configuration comprising first trigger information; and when the UE successfully completes handover to a target cell, the UE executes an operation for an SHR determination process, wherein the first trigger information is used for indicating that the SHR is generated when a CHO execution condition in the executed CHO configuration is satisfied before a CPAC execution condition in the CHO configuration.

Description

Handover information reporting method and user equipment Technical Field

The present disclosure relates to the technical field of wireless communication, and more specifically, to a switching information reporting method and a corresponding user equipment when switching is performed in wireless communication.

Background Art

The 3GPP RAN working group is currently conducting a research project for Release 18 (see 3GPP document RP-223520 (Revised WID on Further NR mobility enhancements). One of the research objectives of this project is to implement a conditional primary cell (PCell) change configuration in a dual connectivity (DC) scenario, which includes the process of adding or changing the configuration of a conditional primary secondary cell (PSCell). More specifically, the simultaneous conditional primary cell switching can be achieved while the conditional primary secondary cell group cell can be added or changed, thereby supporting better dual connectivity continuity in the conditional switching scenario to improve the throughput during the switching process.

The present disclosure proposes a solution to the problem of how to implement conditional switching in an NR system while simultaneously reporting switching information when a conditional PSCell is added or changed.

Summary of the invention

The purpose of the embodiments of the present disclosure is to propose a solution to the problem of how to implement a switching information report when a conditional PSCell is added or changed during a conditional switching process in an NR system. More specifically, the present disclosure proposes a solution for how a switching event triggers a switching information report when a conditional switching including a conditional PSCell addition or change is configured, and how to record the corresponding switching information in the switching information report. The present disclosure provides a method for performing a switching information report in a user equipment and a corresponding user equipment.

According to a first aspect of the present disclosure, a handover information reporting method is proposed, comprising:

The user equipment UE receives a successful handover report including the first trigger information from the network side SHR configuration; when the UE successfully completes the switching process to the target cell, the UE performs the operation for the SHR determination process; the first trigger information is used to indicate: if the CHO execution condition in the CHO configuration corresponding to the executed conditional switching CHO process is met before the execution condition of the conditional primary and auxiliary cell addition and change CPAC is met, then SHR is generated when the switching process to the target cell is successfully completed.

In the handover information reporting method of the first aspect above, preferably, the first trigger information is configured by a target cell of the handover process.

In the switching information reporting method of the first aspect above, preferably, the CHO configuration is a CHO configuration including a candidate secondary cell group SCG; the CHO execution condition is an execution condition configured by a condExecutionCond information element in the CHO configuration; the CPAC execution condition is an execution condition configured by a condExecutionCondPSCell information element in the CHO configuration; and the CHO configuration is the CHO configuration saved in a UE variable VarConditionalReconfig.

In the switching information reporting method of the first aspect above, preferably, the operation of performing the SHR determination process includes: if the conditional switching performed is a conditional switching including a candidate SCG, and the CHO execution condition in the executed CHO configuration is satisfied before the execution condition of the CPAC therein, then the successful switching information of the switching event is saved in the UE variable used for SHR.

In the switching information reporting method of the first aspect above, preferably, the successful switching information includes one or more of the following information: first SHR information, used to indicate that the CHO execution condition in the CHO configuration corresponding to the executed conditional switching process is satisfied before the CPAC execution condition therein; second SHR information, used to indicate that the time difference between the satisfaction of the CHO execution condition in the CHO configuration corresponding to the executed conditional switching process and the CPAC execution condition is greater than or equal to a threshold value; third SHR information, used to indicate the time elapsed between the satisfaction of the CHO execution condition in the CHO configuration corresponding to the executed conditional switching process and the satisfaction of the CPAC execution condition; fourth SHR information, used to indicate that a neighboring cell is a primary or secondary cell PSCell cell in a candidate SCG in the CHO configuration; fifth SHR information, used to indicate the measurement result of the PSCell cell in the candidate SCG in the CHO configuration.

In the above-mentioned handover information reporting method of the first aspect, preferably, the first SHR information or the second SHR information is carried by an SHR-cause field.

In the handover information reporting method of the first aspect above, preferably, the fourth SHR information indicates that a neighboring cell in the measurement result is a PSCell cell in a candidate SCG in a CHO configuration; the CHO configuration is a CHO configuration in which the candidate target primary cell PCell in the CHO configuration is the same as the target cell of the successfully executed handover process.

In the switching information reporting method of the first aspect above, preferably, the switching information reporting method also includes: the UE receives a UE information request UEInformationRequest message from the network side, and the UEInformationRequest message carries a request for requesting the UE to report the saved SHR; and the UE includes the content of the saved SHR in a UE information response UEInformationResponse message, and sends a UEInformationResponse message to the network side.

According to a second aspect of the present disclosure, a user equipment UE is proposed, comprising: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, execute the handover information reporting method according to the context.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the present disclosure and its advantages, reference will now be made to the following description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic diagram showing a CHO configuration including a candidate SCG in the present disclosure.

FIG2 is a schematic diagram showing multiple CHO configurations when a CHO candidate cell is associated with multiple candidate SCGs in the present disclosure.

FIG3 is a schematic flowchart showing a handover information reporting method in Embodiment 1 of the present disclosure.

FIG. 4 is a schematic flowchart showing a handover information reporting method in Embodiment 2 of the present disclosure.

FIG5 is a schematic flowchart showing a switching information reporting method in Embodiment 3 of the present disclosure.

FIG6 is a block diagram showing a user equipment UE involved in the present disclosure.

In the drawings, the same or similar structures are marked with the same or similar reference numerals.

DETAILED DESCRIPTION

Other aspects, advantages and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description of exemplary embodiments of the disclosure taken in conjunction with the accompanying drawings.

In the present disclosure, the terms "include" and "contain" and their derivatives are intended to include but not be limited; the term "or" is inclusive, meaning and/or. "If", "if", "in the case of" and "when" are interchangeable.

In this specification, the various embodiments described below for describing the principles of the present disclosure are merely illustrative and should not be interpreted in any way as limiting the scope of the disclosure. The following description with reference to the accompanying drawings is used to help fully understand the exemplary embodiments of the present disclosure as defined by the claims and their equivalents. The following description includes a variety of specific details to aid understanding, but these details should be considered merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, for the sake of clarity and brevity, descriptions of well-known functions and structures are omitted. In addition, throughout the accompanying drawings, the same reference numerals are used for similar functions and operations.

The following uses the Long Term Evolution (LTE)/NR mobile communication system and its subsequent evolution versions as example application environments to specifically describe multiple implementations according to the present disclosure. However, the present disclosure is applicable to many other wireless communication systems. Unless otherwise specified, the concepts of cell and base station can be interchangeable; the cell can also be a cell under any type of base station mentioned above. Unless otherwise specified, the cell, beam, and transmission point (TRP) can be interchangeable. A handover command is equivalent to a radio resource control (RRC) message containing a handover command, and refers to an RRC message or a configuration in an RRC message that triggers the UE to perform a handover. A handover configuration refers to all or part of the configuration in a handover command. Cancellation, release, deletion, clearing, and removal can be replaced. Execution, use, and application can be replaced. Configuration and reconfiguration can be replaced. Monitoring and detection can be replaced. Initiation and triggering can be replaced.

The following describes processes or concepts in the prior art to which the present disclosure relates.

Switching configuration in NR system:

In the NR system, the RRC reconfiguration message for the handover command carries the RRC configuration from the target base station, including but not limited to the following RRC configuration (see section 6.2.2 of 3GPP technical standard protocol 38.331-h50 for details):

- measurement configuration;

-Cell group configuration (cellGroupConfig information element), used to configure the primary cell group or the secondary cell group. It includes the radio link control (RLC) bearer configuration (rlc-bearerToAddModList information element and rlc-bearerToreleaselist information element) corresponding to the data radio bearer/signaling radio bearer, medium access control (MAC) configuration (MAC-cellgroupconfig information element), physical layer configuration, secondary cell addition/modification/release configuration, special cell (SpCell) configuration, etc. Among them, the reconfigurationwithsync information element contained in the SpCell configuration (spCellConfig information element) is similar to the mobile control information in the LTE system, and contains handover-related information to achieve mobility. It includes the serving cell configuration public information (such as the identification and frequency information of the target serving cell), the cell radio network temporary identification C-RNTI of the UE in the target cell, the handover process monitoring timer T304 configuration, and the random access dedicated configuration used for the random access process to the target cell.

-Radio bearer configuration (radiobearerConfig information element), used to configure the Service Data Application Protocol (SDAP) and Packet Data Convergence Protocol (PDCP) of the Data Radio Bearer (DRB) and/or Signaling Radio Bearer (SRB).

-Master key update configuration (masterKeyupdate information element).

Since the handover command is an RRC reconfiguration message including a synchronous reconfiguration (Reconfiguration with sync) information element for the master cell group MCG, the handover may also be referred to as synchronous reconfiguration of the MCG.

Dual Connectivity (DC):

In order to improve the data transmission efficiency of UE, UE establishes links with two base stations at the same time. Among the two base stations, one is called the master base station (Master Node, MN) or MgNB, MeNB, and the serving cell group under the master base station is called the master cell group (Master Cell Group, MCG); the other is called a secondary Node (SN) or SgNB, SeNB, and the service cell group under the secondary base station is called a secondary cell group (SCG). MCG contains at least one primary cell (PCell), and optionally, one or more secondary cells (SCell). PCell operates on the primary frequency, and the UE performs the initial connection establishment process or the connection re-establishment process through the primary frequency. SCG contains at least one PSCell, and optionally one or more SCells. PSCell refers to the SCG cell to which the UE performs random access when performing a synchronous reconfiguration process or an SCG addition process. PCell and PSCell are also collectively referred to as special cells SpCell.

Switching process in NR system:

The mobility of users in the connected primary cell is mainly achieved through the handover process, which refers to the process of changing the serving cell (primary cell) of the UE in the RRC connected state. The general handover process includes the following stages: Stage 1: Measurement stage. The UE measures the radio link corresponding to the serving cell or the neighboring cell based on the configured measurement configuration. When the configured measurement reporting conditions are met, the UE sends a measurement report to the base station. Stage 2: Handover preparation stage. The base station determines to trigger the handover for the UE based on the received measurement report and other factors such as the base station load. The source base station and the target base station obtain the handover command configured by the target base station through the handover preparation process. Stage 3: Handover execution stage. The source base station sends the handover command to the UE, and the UE that receives the handover command immediately applies the configuration of the handover command to perform the handover. The UE detects the handover process through a timer T304. When the handover process is initiated, the UE starts the T304 timer; when the handover process is completed, the UE stops the timer T304; when T304 times out, the UE considers that the handover has failed. The above handover process is also applicable to the PSCell change process.

Unlike the general handover process in stage 3, in which the UE performs handover immediately after receiving the handover command, the NR system also supports conditional handover CHO, also known as conditional reconfiguration. In conditional handover, a relatively conservative measurement report threshold is set so that the base station obtains the measurement results in advance and performs handover preparation in advance based on the measurement results and the selected target base station. In this way, the base station can send a handover command containing the handover candidate cell and the handover execution condition to the UE in advance before the actual handover condition (relative to the conservative measurement report threshold) is met. The condition for the UE to execute handover. After receiving the conditional handover command, the UE does not execute the handover immediately, but saves the received handover command configuration and starts monitoring the link quality of the source cell or the link quality of the target cell according to the handover execution condition carried in the handover command message to evaluate whether the handover execution condition is met. Only when it is monitored that the configured handover execution condition is met, the UE starts to execute the saved handover command and access the target cell. The UE can be configured with multiple conditional handover candidate cells at the same time. If multiple conditional handover candidate cells meet the handover execution conditions at the same time, the UE selects one candidate cell from them as the final conditional handover target cell and executes the handover to the cell. In short, conditional handover refers to a handover process that is executed only when one or more configured handover execution conditions are met. Because the handover command is included in the RRC reconfiguration message, conditional handover is also called conditional reconfiguration.

PSCell change process in NR system

The PSCell change process in the NR system is triggered by the UE through the RRC reconfiguration message containing the synchronization reconfiguration information element for SCG. The PSCell change process can be initiated by the MN or the SN. When the Signaling Radio Bearer (SRB) 3 is configured, the SN can autonomously initiate the PSCell change process without the participation of the MN. At this time, the SN sends the PSCell change command for SCG to the UE on SRB3. Generally speaking, the PSCell change initiated autonomously by the SN through SRB3 is Intra-SN, that is, the PSCell change within the same secondary base station. When SRB3 is not configured, whether the PSCell change process is initiated by the SN or the MN, the PSCell change command is sent to the UE on SRB1, including intra-SN or inter-SN PSCell changes. The RRC reconfiguration message of the PSCell change command for SN is included in the nr-SecondaryCellGroupConfig information element (when E-UTRAN is MN) or the mrdc-SecondaryCellGroup information element (when NR is MN) of its outer RRC message. The outer message is generally an RRC (connection) reconfiguration message or a DLInformationTransferMRDC message. The UE that receives the PSCell change command executes the PSCell change process, starts the timer T304 for the SCG to monitor the process, starts the downlink synchronization to the target PSCell, applies the configuration of the RRC reconfiguration message including the synchronization reconfiguration for the SCG, and sends an RRC reconfiguration completion message to the network side. According to the received outer layer message of the PSCell change command, the RRC reconfiguration complete message may also be embedded in an outer layer RRC message, such as an RRC (connection) reconfiguration complete message or a ULInformationTransferMRDC message.

After the introduction of conditional reconfiguration in the NR system, conditional reconfiguration is supported for adding or changing PSCells. Similar to conditional handover CHO, the UE is configured with conditional reconfiguration for SCG, which means that the conditional reconfiguration containing PSCell candidate cells and execution conditions is sent to the UE. After receiving the conditional reconfiguration, the UE does not immediately execute the addition or change of the PSCell candidate cells contained therein, but saves the received conditional reconfiguration and starts monitoring the link quality of the source cell or the link quality of the target candidate cell according to the execution conditions carried therein to evaluate whether the execution conditions are met. Only when it is monitored that the configured execution conditions are met, the UE starts to execute the SCG configuration in the saved conditional reconfiguration and accesses the selected PSCell candidate cell. Like CHO, the UE can be configured with multiple PSCell candidate cells at the same time. If multiple candidate cells meet the execution conditions at the same time, the UE selects one candidate cell as the final target PSCell cell and synchronizes to the cell. The conditional reconfiguration for SCG may be referred to as Conditional PSCell Addition Change (CPAC), where Conditional PSCell Addition is also referred to as CPA (Conditional PSCell Addition) and Conditional PSCell Change is also referred to as CPC (Conditional PSCell Change). For the convenience of description, CPAC in this disclosure may refer to CPC or CPA.

Conditional Reconfiguration

As mentioned above, conditional reconfiguration can be applied to MCG or SCG. Conditional reconfiguration of MCG/PCell is called conditional handover CHO; conditional reconfiguration of SCG/PSCell is called conditional PSCell addition or change CPAC. In the NR system, conditional reconfiguration is configured to the UE through the conditional reconfiguration ConditionalReconfiguration information element in the RRC message. The ConditionalReconfiguration information element contains a list of conditional reconfiguration candidate cells (condReconfigToAddModList information element for adding or modifying candidate cells or condReconfigToRemoveList information element for removing candidate cells). The UE saves the configuration corresponding to one or more of the conditional reconfiguration candidate cells in the UE variable VarConditionalReconfig. In the NR system of version 17, the UE maintains two The varConditionalReconfig variable is used to save the CHO configuration of the MCG and the CPAC configuration of the SCG respectively. Among the one or more conditional configuration items saved in each variable, each item is identified by a conditional reconfiguration identifier (condReconfigId), including the execution condition (condExecutionCond or condExecutionCondSCG) and the RRC configuration of the candidate cell (condRRCReconfig). The RRC configuration of the candidate cell contains a nested RRC reconfiguration message, in which the cell identified by the cell identifier in the serving cell common configuration (servingCellConfigCommon information element) in the synchronous reconfiguration (reconfigurationWithSync information element) corresponds to a conditional reconfiguration candidate cell. The UE performs conditional reconfiguration evaluation on each conditional reconfiguration candidate cell according to the execution condition. The execution condition may include one or two measurement identifiers (measID). Only when the measurement events corresponding to all measurement identifiers included in the execution condition (such as condEventA3 or CondEventA5 included in the CondTriggerConfig information element) are satisfied, the UE considers the corresponding candidate cell to be a trigger cell and initiates the conditional reconfiguration execution process. During the conditional reconfiguration execution process, the UE applies the saved RRC configuration (condRRCReconfig) corresponding to the selected trigger cell to the selected trigger cell, and performs cell change operations, such as starting timer T304, downlink synchronization to the selected cell, initiating a random access process to the selected cell for uplink synchronization, and sending an RRC reconfiguration completion message to the selected cell, etc. (See Section 5.3.5.3 of the 3GPP protocol specification document TS38.331 for details, which will not be repeated here). In the present disclosure, unless otherwise specified, CHO and CHO configurations can be replaced, and CPAC and CPAC configurations can be replaced.

CHO with candidate SCG for CPAC:

The NR system of version 17 supports CHO including SCG configuration, that is, for each CHO candidate cell configuration, in addition to the corresponding MCG configuration, it can also include SCG configuration. However, when CHO is executed, the SCG configuration included therein may not be appropriate, which will cause SCG failure during CHO execution (such as failure to add or change PSCell).

In the mobility enhancement discussion of Release 18 currently being conducted by 3GPP, in order to solve the above problems, it is proposed that the CHO configuration can be associated with one or more CPAC configurations. In version 17, the CHO configuration includes a fixed SCG configuration. The CHO configuration proposed in version 18 can include or be associated with one or more candidate SCG configurations, and each candidate SCG configuration is equivalent to a CPAC configuration. When the UE receives a CHO configuration and an associated CPAC configuration, it can simultaneously start the conditional reconfiguration evaluation of CHO and the corresponding associated CPAC conditional reconfiguration evaluation. In this way, when the execution condition of CHO is met, that is, when CHO is triggered, the UE can select a most suitable SCG configuration for PSCell access from multiple candidate SCG configurations according to the evaluation of the corresponding CPAC execution conditions. This can greatly reduce the problem of SCG failure or SCG inappropriateness in the CHO process caused by only one fixed SCG configuration in the CHO configuration in version 17. In this disclosure, the CHO configuration in this newly introduced mechanism is referred to as a CHO configuration associated with a CPAC configuration, a CHO configuration including a CPAC configuration, a CHO configuration with a candidate SCG for CPAC, or a CHO configuration with a candidate CPAC (configuration), or a CHO configuration including a candidate SCG. However, it is worth noting that the present disclosure is not limited to the above-mentioned nomenclature. The present disclosure will hereinafter refer to the CHO (configuration) containing the candidate SCG.

In the CHO configuration including the candidate SCG, the CHO configuration (a CondReconfigToAddMod configuration) includes an RRC reconfiguration message (including MCG configuration and SCG configuration), CHO execution conditions (such as identified by condExecutionCond) and CPAC execution conditions (such as identified by condExecutionCondPSCell), and is identified by a CHO identification number CondReconfigId, as shown in Figure 1. If a CHO candidate cell is associated with multiple candidate SCG configurations, then for this CHO candidate cell, the network side will configure multiple CHO configurations for the UE, and each CHO configuration includes an MCG configuration and an SCG configuration. That is, the CHO candidate cell identifiers in multiple conditional reconfigurations (identified by condReconfigId) can be the same, but correspond to different CPAC candidate cell identifiers. As shown in Figure 2, multiple CHO configurations are configured for PCell 1, each CHO configuration corresponds to a different PSCell, and these multiple CHO configurations are identified by different CondReconfigId.

In the above scenario, when the UE receives an RRC message containing the CPAC configuration of the CHO and the associated candidate SCG, the UE saves the received CHO configuration and CPAC configuration and simultaneously starts the corresponding conditional reconfiguration evaluation. Conclusions reached by the 3GPP working group In the CHO process, only when the execution conditions of CHO are met and the associated CPAC execution conditions are also met, the UE triggers and executes the CHO process accompanied by CPAC, and at the same time triggers and completes the switching and PSCell addition or change. If the execution conditions of the associated CPAC are not met when the execution conditions of CHO are met, in this case, if the UE is configured with the traditional CHO configuration, the UE triggers the execution of the CHO process and applies the configured traditional CHO configuration. In the present disclosure, the traditional CHO configuration refers to a CHO configuration that does not include a CPAC configuration or a CHO configuration that does not include a candidate SCG configuration (that is, the CHO configuration does not include a CPAC execution condition), such as the CHO configuration that does not include an SCG configuration introduced in version 16 or the CHO configuration that includes an SCG configuration introduced in version 17 (which does not include the CPAC execution condition configuration corresponding to the SCG configuration).

Successful switch report:

The handover information report upon successful handover is standardized in the NR system of version 17. The handover information report upon successful handover is also referred to as a successful handover report (SHR), which is used to provide the network side with mobility information related to the successful execution of the handover process, so that the network side can further optimize the configuration of mobility parameters based on the information reported by these UEs, and improve the handover performance, such as reducing the handover delay. The content of the successful handover information report may include one or more of the following: UE Radio Network Temporary Identifier C-RNTI, source cell identifier, target cell identifier, measurement results of the source cell or target cell, neighbor cell measurement results, indication of the reason why the successful handover information report is triggered (i.e. which trigger condition is met), random access process information, and location information. The successful handover includes the successful sending of the RRC reconfiguration completion message for responding to the handover command RRC reconfiguration message to the target base station or the successful completion of the random access process to the target base station by the MAC layer. The information configured by the network side to the UE for triggering a successful handover report (such as the threshold values corresponding to T310, T312, and T304, and the source cell experiencing a radio link failure RLF during the Dual Active Protocol Stack (DAPS) handover execution) is called SHR configuration. The SHR configuration is triggered only when one or more trigger conditions according to the configured trigger information are met (such as the percentage of the operating value of T310 (or T312) of the source cell to the configured value of T310 (or T312) when the handover command is received or the handover is executed exceeds the corresponding configured threshold value, and the percentage of the operating value of T304 to the configured value of T304 when the handover is successfully completed exceeds the corresponding configured threshold value). Value, when RLF occurs in the source cell during the execution of DAPS switching (when timer T304 is running), the UE will record the switching information of the successful switching in the UE variable corresponding to the SHR (such as VarSuccessHO-Report). Among them, the trigger conditions related to the source cell, such as the T310 threshold value or the T312 threshold value, are configured to the UE by the source cell, and the trigger conditions related to the target cell, such as the T304 threshold value, are configured to the UE by the target cell. The configuration of these successful switching report triggering information is included in the successful switching report configuration (such as the successHO-config information element). The UE can inform the network side through an RRC message that there is an available successful switching report (such as indicated by the successHO-InfoAvailable information element). After receiving the indication, the network side can request the UE to report its saved successful switching information report through an RRC message (such as the successHO-ReportReq indication in the UEInformationRequest message). The UE will report the saved successful switching report (successHO-Report in the UEInformationResponse message) to the network side in the response RRC message. The successful handover report saved on the UE can be saved for up to 48 hours.

The SHR mechanism in version 17 takes into account traditional switching, conditional switching, and DAPS switching scenarios, and has not yet implemented enhancements to the CHO mechanism including candidate SCGs introduced in version 18. For example, in the CHO mechanism including candidate SCGs, the following two scenarios may exist. In scenario 1, for a UE configured with a CHO configuration including candidate SCGs, if the execution conditions for a certain CHO candidate cell have been met, but the execution conditions corresponding to the SCG to which it is associated or included are met afterwards, the UE triggers the CHO execution process accompanied by CPAC execution and successfully switches to that CHO candidate cell and the corresponding PSCell. In this scenario, the execution conditions of CHO are met before the execution conditions of the included SCGs, that is, the execution time of CHO is delayed by the execution of the candidate SCG, which is not an optimal situation. In the optimal case, the execution conditions of the candidate SCG should be met at the same time as the execution conditions of the associated CHO or in advance of the execution conditions of the associated CHO, so as not to delay the execution of CHO. In scenario 2, if the UE is configured with a CHO configuration that includes a candidate SCG, and the execution condition for a CHO candidate cell is met, but the execution condition for the SCG associated with or included in it is not met, if the UE is also configured with a traditional CHO configuration for the CHO candidate cell (i.e., the CHO candidate cell that does not include the candidate SCG and its execution condition) If the UE has a CHO configuration for the selected cell, the UE can perform conditional reconfiguration to the CHO candidate cell based on the traditional CHO configuration. Considering the above scenario with the CHO mechanism of the candidate SCG, how to trigger the UE to record the SHR and how to report the SHR to the network side become problems that need to be solved.

The following embodiments provide solutions based on the above problems. Unless otherwise specified, the embodiments are not mutually exclusive. The embodiments can be combined, or some concepts or definitions can be common among the embodiments.

Example 1

This embodiment provides a method for configuring, triggering and setting a handover information report executed on a UE. Through the method described in this embodiment, the UE receives an SHR configuration from the network side, and the SHR configuration includes trigger information related to the CHO including the candidate SCG, so that the UE can trigger the UE to record the handover information SHR of the handover event based on the configured trigger information after the handover process is successful, and report it to the network to adjust and optimize the handover parameters.

The following is a detailed description of the embodiment 1 of the present disclosure. Fig. 3 is a schematic flow chart showing a handover information reporting method in the embodiment 1 of the present disclosure. As shown in Fig. 3, the handover information reporting method in the embodiment 1 of the present disclosure may include the following steps.

Step 101: The UE receives an SHR configuration including first trigger information from the network side.

In one implementation method 1, the first trigger information is set to true, indicating that if the CHO execution condition in the CHO configuration corresponding to the executed conditional switching process is satisfied before the CPAC execution condition therein, or the CPAC execution condition in the CHO configuration is satisfied after the CHO execution condition is satisfied, then the UE generates an SHR when the switching process to the target cell is successfully completed.

In another implementation 2, the first trigger information is set to a threshold value TH, indicating that if the time difference between the CHO execution condition and the CPAC execution condition in the CHO configuration corresponding to the executed conditional switching process exceeds or equals the threshold value TH, the UE generates an SHR when the switching process to the target cell is successfully completed. Furthermore, when the CHO execution condition is satisfied before the CPAC execution condition is satisfied, the UE generates an SHR when the switching process to the target cell is successfully completed.

Optionally, the CHO execution condition refers to the execution condition configured with the condExecutionCond information element in the CHO configuration, and the CPAC execution condition refers to the execution condition configured with the condExecutionCondPSCell information element in the CHO configuration. The CPAC execution condition can be interchangeable with the execution condition of the (candidate) SCG. Optionally, because the CHO execution condition or the CPAC execution condition can be configured with one or two trigger events (Meas Ids), the execution condition being satisfied means that all one or both trigger events configured for the candidate cell are satisfied.

Optionally, the first trigger information is configured by a target cell or a source cell of a handover process.

As mentioned above, the SHR configuration includes a configuration for instructing the UE to report successful handover information to the network side. Optionally, in the NR system, it is identified by the successHO-Config information element and included in the other-config information element in the RRC message. Optionally, the SHR configuration is included in the CHO configuration, and further, each CHO configuration includes an SHR configuration.

When the UE receives an RRC message including an SHR configuration, the UE applies the SHR configuration and considers that it is configured with the SHR configuration.

Step 102: When the UE successfully completes the conditional handover process to the target cell, the UE performs an operation for the SHR determination process. The operation for the SHR determination process may include: judging whether the trigger condition is met based on the trigger information in the SHR configuration, and saving the SHR and setting the corresponding content in the SHR when the trigger condition is met.

In combination with the first trigger information in step 101, executing the operation for the SHR determination process may include: for the first trigger information in implementation method 1, if the conditional switching performed is a conditional switching including a candidate SCG (that is, the switching process simultaneously has a PCell triggered based on the execution condition and a PSCell triggered), and the CHO execution condition in the CHO configuration corresponding to the conditional switching process performed is satisfied before the execution condition of the CPAC/SCG therein, or the execution condition of the CPAC in the CHO configuration is satisfied after the CHO execution condition is satisfied, then the successful switching information of the switching event is saved in the UE variable for SHR; for the first trigger information in implementation method 2, if the conditional switching performed is a conditional switching including a candidate SCG (that is, the switching process simultaneously has a PCell triggered based on the execution condition and the triggered PSCell), and the time difference between the satisfaction of the CHO execution condition and the CPAC execution condition in the CHO configuration corresponding to the executed conditional switching process exceeds or is equal to the threshold value TH contained in the SHR configuration; optionally, the CHO execution condition is satisfied before the CPAC execution condition is satisfied, then the successful switching information of the switching event is saved in the UE variable used for SHR.

Optionally, the SHR configuration is further described as the SHR configuration (received or applied) before performing a handover procedure, ie, performing a most recent synchronization reconfiguration.

Optionally, the successful completion of the handover to the target cell refers to the successful completion of a random access process triggered by a handover process of the MCG.

Optionally, the storing of the successful switching information of the switching event is the operation of step 202 in Embodiment 2, that is, setting the first to fifth SHR information.

Optionally, before or between step 101 and step 102, the UE also performs a conditional reconfiguration evaluation process. When the triggering condition of the conditional reconfiguration is met (i.e., it is determined that there is a triggering cell during the conditional reconfiguration evaluation process), a switching process based on the conditional reconfiguration is performed.

Example 2

This embodiment provides a handover information reporting method executed on a UE. Through the method described in this embodiment, a UE configured with a CHO including a candidate SCG records handover information related to the configured CHO configuration including the candidate SCG in an SHR after a handover process is successful, and reports it to the network to adjust and optimize handover parameters.

The following is a detailed description of the embodiment 2 of the present disclosure. Fig. 4 is a schematic flow chart showing a handover information reporting method in the embodiment 2 of the present disclosure. As shown in Fig. 4, the handover information reporting method in the embodiment 2 of the present disclosure may include the following steps.

Step 201: The handover process is successfully completed, and the SHR determination process is performed.

In this step, when the UE is configured with an SHR configuration when connected to the source cell, the UE initiates an SHR determination process when the handover process is successfully completed.

Optionally, when the UE receives an RRC message including an SHR configuration, the UE applies the SHR configuration and considers that it is configured with the SHR configuration.

Optionally, the successful completion of the handover to the target cell refers to the successful completion of a random access process triggered by a handover process of the MCG.

Optionally, the successfully completed switching process is a conditional switching.

Step 202: In performing the operation for the SHR determination process, the UE includes one or more of the following in the SHR:

The first SHR information is used to indicate that the CHO execution condition in the CHO configuration corresponding to the executed conditional switching process is satisfied before the execution condition of the CPAC/SCG therein, or that the execution condition of the CPAC in the CHO configuration is satisfied after the CHO execution condition is satisfied.

Optionally, in the following circumstances, the UE includes the first SHR information or the following third to fifth SHR information in the SHR: the conditional switching performed by the SHR is a conditional switching including a candidate SCG (i.e., the switching process includes both a PCell triggered based on the execution condition and a PSCell triggered), and the CHO execution condition in the CHO configuration corresponding to the executed conditional switching process is satisfied before the execution condition of the CPAC/SCG therein, or the execution condition of the CPAC in the CHO configuration is satisfied after the CHO execution condition is satisfied.

The second SHR information is used to indicate that the time difference between the CHO execution condition and the CPAC execution condition in the CHO configuration corresponding to the executed conditional switching process exceeds or equals the threshold value TH included in the SHR configuration. Furthermore, it also indicates that the CHO execution condition is satisfied before the CPAC execution condition is satisfied.

Optionally, in the following circumstances, the UE includes the second SHR information or the third to fifth SHR information in the SHR: the conditional switching performed is a conditional switching including a candidate SCG (i.e., the switching process simultaneously includes a PCell triggered based on the execution condition and a PSCell triggered), and in the CHO configuration corresponding to the conditional switching process performed (optionally, the CHO execution condition is satisfied before the CPAC execution condition is satisfied and) the time difference between the CHO execution condition and the CPAC execution condition being satisfied exceeds or is equal to the threshold value TH included in the SHR configuration.

Optionally, the first SHR information and the second SHR information are carried by an SHR-cause field.

The third SHR information is used to indicate the CHO corresponding to the conditional switching process executed. The time (time difference) between the execution condition of CHO in the configuration being met and the execution condition of CPAC being met.

Optionally, the third SHR information does not limit whether the CHO execution condition is satisfied first or the execution condition corresponding to the associated candidate SCG is satisfied first. That is, the third SHR information can be the time from when the CHO execution condition is satisfied to when the CPAC execution condition is satisfied in the CHO configuration corresponding to the executed conditional switching process, or it can be the time from when the CPAC execution condition is satisfied to when the CHO execution condition is satisfied in the CHO configuration corresponding to the executed conditional switching process.

The fourth SHR information is used to indicate whether the neighboring cell is a PSCell cell in the candidate SCG in the CHO configuration.

Optionally, the neighboring cell refers to one or more neighboring cells in a neighboring cell measurement result list (for example, identified by a measResultNeighCells information element).

Optionally, if a neighboring cell is a candidate target PSCell in a candidate SCG configuration included in a CHO configuration, the fourth SHR information is set to true.

Optionally, the CHO configuration refers to a CHO configuration in which a candidate PCell in the CHO configuration is the same as a target cell of a successfully executed handover process. That is, the candidate target PCell in the CHO configuration is the target cell of the successfully executed handover.

The fifth SHR information is used to indicate the measurement results of the PSCell cells in the candidate SCG in one or more CHO configurations. The CHO configuration refers to the CHO configuration in which the candidate PCell in the CHO configuration is the same as the target cell of the successfully executed handover process. That is, the candidate target PCell in the CHO configuration is the target cell of the successfully executed handover.

Optionally, the CHO configuration is an active cell configuration, the CHO execution condition refers to the execution condition configured by the condExecutionCond information element in the CHO configuration, and the CPAC execution condition refers to the execution condition configured by the condExecutionCondPSCell information element in the CHO configuration. Optionally, because the CHO execution condition or the CPAC execution condition can be configured with one or two trigger events (Meas Ids), the execution condition being satisfied means that all one or two trigger events configured for the candidate cell are satisfied.

Optionally, when the successful handover process is a conditional handover process, that is, the RRC reconfiguration including the synchronous reconfiguration information element is included in a conditional reconfiguration When the fourth SHR information or the fifth SHR information is set, the UE sets or includes the fourth SHR information or the fifth SHR information in the SHR.

Optionally, the SHR configuration is further described as the SHR configuration (received or applied) before performing a handover procedure, ie, performing a most recent synchronization reconfiguration.

Optionally, the SHR configuration is an SHR configuration received when connecting to a source cell.

Optionally, the successful completion of the handover to the target cell refers to the successful completion of a random access process triggered by a handover process of the MCG.

Optionally, in step 202, the UE includes the first to fifth SHR information in the SHR only when the SHR is configured with the SHR configuration in embodiment 1. Optionally, in step 202, the UE includes the first to fifth SHR information in the SHR when the UE is configured with other SHR configurations and the configured SHR configurations are satisfied.

Optionally, before step 201, the UE also includes receiving a switching command from the network and executing a switching process; or the UE executes a conditional reconfiguration (Conditional Reconfiguration) evaluation process, and when the triggering condition of the conditional reconfiguration is met (i.e., it is determined that there is a triggering cell during the conditional reconfiguration evaluation process), a switching process based on the conditional reconfiguration is executed.

Example 3

This embodiment provides a handover information reporting method executed on a UE. Through the method described in this embodiment, the UE can report the relevant information in the above embodiment to the base station in a successful handover report to provide more accurate handover information to the network side. This embodiment provides a method for the UE to report the handover information report described in embodiment 1 or embodiment 2 through an RRC process.

The following is a detailed description of the third embodiment of the present disclosure. Fig. 5 is a schematic flow chart showing a handover information reporting method in the third embodiment of the present disclosure. As shown in Fig. 5 , the handover information reporting method in the third embodiment of the present disclosure may include the following steps.

Step 301: The UE receives a UEInformationRequest message from the network side, which carries an indication/request for requesting the UE to report a saved successful handover report (such as a successHO-ReportReq information element set to true).

Step 302: The UE includes the content of the saved successful handover report in a UEInformationResponse message (such as the successHO-Report information element therein). The UEInformationResponse message is sent to the network side. The successful handover report included in the RRC message includes one or more of the first to fifth SHR information in the above-mentioned embodiment 1 or embodiment 2.

It should be noted that the handover information report in the aforementioned embodiments of the present disclosure is described by taking SHR as an example, but the report is not limited to SHR, and may also refer to reports of other commands.

Example 4

This embodiment illustrates the user equipment UE of the present disclosure. FIG6 is a block diagram of the user equipment UE involved in the present disclosure. As shown in FIG6, the user equipment UE10 includes a processor 101 and a memory 102. The processor 101 may include, for example, a microprocessor, a microcontroller, an embedded processor, etc. The memory 102 may include, for example, a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other memories, etc. Program instructions are stored on the memory 102. When the instructions are executed by the processor 101, the above-mentioned switching information reporting method described in detail in the present invention may be executed.

The method of the present invention and the equipment involved have been described above in conjunction with the preferred embodiments. It will be appreciated by those skilled in the art that the method shown above is exemplary only. The method of the present invention is not limited to the steps and sequence shown above. The base station and user equipment shown above may include more modules, for example, modules that can be developed or developed in the future and can be used for base stations, MMEs, or UEs, etc. The various identifiers shown above are exemplary only and not restrictive, and the present invention is not limited to the specific information elements used as examples of these identifiers. Those skilled in the art may make many changes and modifications based on the teachings of the illustrated embodiments.

The program running on the device according to the present disclosure may be a program that enables a computer to implement the functions of the embodiments of the present disclosure by controlling a central processing unit (CPU). The program or information processed by the program may be temporarily stored in a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other memory systems.

The program for realizing the functions of each embodiment of the present disclosure can be recorded on a computer-readable recording medium. The corresponding functions can be realized by making a computer system read the program recorded on the recording medium and executing these programs. The so-called "computer system" herein can be a computer system embedded in the device, and can include an operating system or hardware (such as a peripheral device). "Computer-readable recording medium" can be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium of a short-term dynamic storage program, or any other recording medium readable by a computer.

The various features or functional modules of the devices used in the above embodiments can be implemented or executed by circuits (e.g., monolithic or multi-chip integrated circuits). Circuits designed to perform the functions described in this specification may include general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above devices. The general-purpose processor may be a microprocessor, or any existing processor, controller, microcontroller, or state machine. The above circuits may be digital circuits or analog circuits. In the case where new integrated circuit technologies have emerged to replace existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present disclosure may also be implemented using these new integrated circuit technologies.

In addition, the present disclosure is not limited to the above-mentioned embodiments. Although various examples of the embodiments have been described, the present disclosure is not limited thereto. Fixed or non-mobile electronic devices installed indoors or outdoors can be used as terminal devices or communication devices, such as AV equipment, kitchen equipment, cleaning equipment, air conditioners, office equipment, vending machines, and other household appliances.

As mentioned above, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. However, the specific structure is not limited to the above embodiments, and the present disclosure also includes any design changes that do not deviate from the main purpose of the present disclosure. In addition, various changes can be made to the present disclosure within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present disclosure. In addition, the components with the same effect described in the above embodiments can be replaced by each other.

Claims (9)

A switching information reporting method, comprising: The user equipment UE receives a successful handover report SHR configuration including first trigger information from the network side; When the UE successfully completes the handover process to the target cell, the UE performs an operation for the SHR determination process; The first trigger information is used to indicate: if the CHO execution condition in the CHO configuration corresponding to the executed conditional switching CHO process is met before the execution condition of the conditional primary and secondary cell addition and change CPAC is met, then SHR is generated when the switching process to the target cell is successfully completed. The switching information reporting method according to claim 1, wherein: The first trigger information is configured by a target cell of the handover process. The switching information reporting method according to claim 1, wherein: The CHO configuration is a CHO configuration including a candidate secondary cell group SCG; The CHO execution condition is the execution condition configured by the condExecutionCond information element in the CHO configuration; The CPAC execution condition is the execution condition configured with the condExecutionCondPSCell information element in the CHO configuration; The CHO configuration is the CHO configuration saved in the UE variable VarConditionalReconfig. The switching information reporting method according to claim 1, wherein: The operations for executing the SHR determination process include: if the conditional switching performed is a conditional switching including a candidate SCG, and the CHO execution condition in the executed CHO configuration is satisfied before the execution condition of the CPAC therein, then the successful switching information of the switching event is saved in the UE variable for SHR. The switching information reporting method according to claim 4, wherein: The successful switching information includes one or more of the following information: The first SHR information is used to indicate the CHO corresponding to the conditional switching process executed. The execution conditions of CHO in the configuration are met before the execution conditions of CPAC in it; The second SHR information is used to indicate that the time difference between the CHO execution condition and the CPAC execution condition in the CHO configuration corresponding to the executed conditional switching process is greater than or equal to a threshold value; The third SHR information is used to indicate the time elapsed between the CHO execution condition in the CHO configuration corresponding to the executed conditional switching process being satisfied and the CPAC execution condition being satisfied; The fourth SHR information is used to indicate that a neighboring cell is a primary and secondary cell PSCell cell in a candidate SCG in the CHO configuration; The fifth SHR information is used to indicate the measurement results of the PSCell cells in the candidate SCG in the CHO configuration. The switching information reporting method according to claim 5, wherein: The first SHR information or the second SHR information is carried in the SHR-cause field. The switching information reporting method according to claim 5, wherein: Fourth SHR information, indicating that a neighboring cell in the measurement result is a PSCell cell in a candidate SCG in a CHO configuration; The CHO configuration is a CHO configuration in which a candidate target primary cell PCell in the CHO configuration is the same as a target cell of the successfully performed handover process. The switching information reporting method according to claim 1, wherein: The switching information reporting method further includes: The UE receives a UE information request UEInformationRequest message from the network side, where the UEInformationRequest message carries a request for requesting the UE to report the stored SHR; and The UE includes the content in the stored SHR in a UE information response UEInformationResponse message, and sends the UEInformationResponse message to the network side. A user equipment, comprising: Processor; and A memory, wherein instructions are stored in the memory; When the instruction is executed by the processor, the user equipment executes the switching information reporting method according to any one of claims 1-8.