Cell change information reporting method and user equipment

Abstract

Provided in the present disclosure are a cell change information reporting method and a user equipment. The cell change information reporting method comprises: a user equipment (UE) successfully completing a layer 1 / layer 2-triggered mobility (LTM) cell switch process to a target cell, and the UE executing an operation for determining a cell change information report, wherein the operation for determining the cell change information report comprises: initiating a record for the cell change information report, and setting user-plane measurement information in the cell change information report.

Description

Cell change information reporting method and user equipment Technical Field

[0001] The present disclosure relates to the technical field of wireless communications, and more particularly, to a method for reporting cell change information when a cell change is performed in wireless communications and a corresponding user equipment. Background Art

[0002] Network optimization in wireless networks can achieve the goal of optimizing network performance. Data collection and analysis are typically performed on existing deployed and operational networks to identify factors affecting network quality. Network performance can then be improved by modifying configured network parameters, adjusting network structure, and adjusting deployed equipment. Self-configuration and self-optimization networks (SON) refer to the process of automatically adjusting the network based on user equipment and / or base station measurements and performance measurements. The network can configure UEs to perform measurements for SON. SON functions include many aspects, such as the Automatic Neighbor Relation (ANR) function, which reduces the operator's burden of neighbor management; Mobility Load Balancing (MLB), which balances load between different cells; Mobility Robustness Optimization (MRO), which optimizes mobility performance; Random Access Channel Optimization, which optimizes random access channel parameters; and Radio Link Failure Reporting (RLFR), which optimizes coverage and MRO.

[0003] In the NR system, the Radio Link Failure (RLF) report is used to record relevant information on the UE side when a link failure occurs; the Successful Handover Report (SHR) is used to record relevant information about the UE handover process when the handover process is successful. The network side uses the above information recorded and reported by the UE to diagnose and optimize network coverage, mobility robustness parameters, random access process configuration and other issues or parameters.

[0004] The introduction of Layer 1 / L2-triggered mobility (LTM) mechanism is under discussion in the NR system of version 18. The purpose of this mechanism is to reduce mobility delay. In the NR system before version 18, mobility was mainly achieved through handover (also known as synchronous reconfiguration) triggered by Radio Resource Control (RRC) layer signaling based on Layer 3 measurement results. During the handover process, the UE releases the source service cell and then adds the target service cell, and needs to perform a complete Layer 2 and Layer 1 reset operation. This results in longer latency, higher overhead and longer data interruption time in the mobility process. In the LTM mechanism, the RRC configuration of the target candidate cell is sent to the UE in advance, and the subsequent cell change is triggered through Layer 1 or Layer 2 signaling based on the Layer 1 measurement results, thereby achieving the purpose of reducing latency, overhead and interruption time.

[0005] The present disclosure aims to implement the SON reporting problem based on LTM in NR networks, and further, to implement the SON reporting problem in the scenario of successful cell change in networks supporting LTM.

[0006] Summary of the Invention

[0007] The purpose of the embodiments of the present disclosure is to provide a solution for implementing cell change information reporting when a cell change is successful under the LTM mechanism in an NR system. More specifically, the present disclosure provides a solution for triggering a cell change information report after a UE performs an LTM cell change, and for recording the corresponding cell change information in the cell change information report. The present disclosure provides a method for performing cell change information reporting in a user equipment and corresponding user equipment.

[0008] According to a first aspect of the present disclosure, a cell change information reporting method is proposed, comprising: a user equipment (UE) receiving configuration information for triggering a cell change information report from a network side; when the UE successfully completes a layer 1 and layer 2 triggered mobility (LTM) cell change process to a target cell, performing a cell change information report determination operation based on the configuration information for triggering the cell change information report, the determination operation comprising: including one or more of the following information in the cell change information report: first cell change information for indicating that the cell change process is an LTM cell change process; second cell change information for indicating user plane measurement information of the cell change process; and third cell change information for indicating the cell The triggering cause of the change information report is that the cell change process is RACH-less; the fourth cell change information is used to indicate that the triggering cause of the cell change information report is the occurrence of a fallback from no random access RACH-less to random access RA; the fifth cell change information is used to indicate that the triggering cause of the cell change information report is that a layer 2 reset is performed during the cell change process; the sixth cell change information is used to indicate that the triggering cause of the cell change information report is that a layer 2 reset is not performed during the cell change process; the seventh cell change information is used to indicate the source cell information of the cell change process; the eighth cell change information is used to indicate the target cell information of the cell change process.

[0009] In the cell change information reporting method of the first aspect above, optionally, the configuration information for triggering the cell change information report includes one or more of the following information: first trigger information, used to indicate that if the LTM cell change process has a fallback from no random access RACH-less to a random access RA process to the target cell, the UE records the cell change information report corresponding to this cell change process; second trigger information, used to indicate that if the LTM cell change process is no random access RACH-less, the UE records the cell change information report corresponding to this cell change process; third trigger information, used to indicate that if a layer 2 reset is performed during the LTM cell change process, the UE triggers the recording of the cell change information report corresponding to the LTM cell change process; fourth trigger information, used to indicate that if a layer 2 reset is not performed during the LTM cell change process, the UE records the cell change information report corresponding to the LTM cell change process.

[0010] In the cell change information reporting method of the first aspect above, optionally, when the cell change process is an LTM cell change and the cell change process is RACH-less, the UE includes the second cell change information in the cell change information report; or, when the cell change process is an LTM cell change and no layer 2 reset is performed in the cell change process, the second cell change information is included in the cell change information report; or, when the cell change process is an LTM cell change and a layer 2 reset is performed in the cell change process, the second cell change information is included in the cell change information report.

[0011] In the cell change information reporting method of the first aspect above, optionally, the UE receives a UE information request UEInformationRequest message from the network side; if the UEInformationRequest message carries an indication requesting the UE to report a saved cell change information report, and the UE has a saved cell change information report associated with an LTM cell change, then the user plane measurement information is included in the cell change information report.

[0012] In the cell change information reporting method of the first aspect above, optionally, if the cell change information report is associated with an LTM cell change process and the LTM cell change process has a fallback from no random access RACH-less to random access RA to the target cell, the cell change information report includes user-plane measurement information; or, if the cell change information report is associated with an LTM cell change process and the LTM cell change process is no random access RACH-less, the cell change information report includes user-plane measurement information; or, if the cell change information report is associated with an LTM cell change process and the LTM cell change process performs a layer 2 reset, the cell change information report includes user-plane measurement information; or, if the cell change information report is associated with an LTM cell change process and the LTM cell change process does not perform a layer 2 reset, the cell change information report includes user-plane measurement information.

[0013] In the cell change information reporting method of the first aspect above, optionally, the user plane measurement information is user plane interruption time; the user plane interruption time is the time between the arrival time of the last data packet received by the UE from the source cell and the arrival time of the first data packet received from the target cell when the cell is changed.

[0014] In the cell change information reporting method of the first aspect above, optionally, the successful completion of the LTM cell change process is the successful completion of the random access RA process triggered by the LTM cell change process; or, the radio resource control RRC layer receives an indication of successful completion of the LTM cell change from the media intervention control MAC layer.

[0015] In the cell change information reporting method of the first aspect above, optionally, the cell change information report is a successful handover report SHR; and the cell change information report configuration is included in a successHO-Config information element.

[0016] In the cell change information reporting method of the first aspect above, optionally, the cell change 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 cell change information report; and the UE includes the content of the saved cell change information report in a UE information response UEInformationResponse message and sends it to the network side.

[0017] 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 cell change information reporting method described in the context. Beneficial effects

[0018] This disclosure proposes a solution to the problem of reporting cell change information during a successful LTM cell switch process. Using the method described herein, a UE can determine whether to record corresponding cell change information, such as user plane measurement information, based on the configuration information for reporting successful LTM cell switch information. The network can also determine whether LTM mobility robustness or cell change interruption time can be further optimized based on the cell change information corresponding to the LTM cell switch reported by the UE, thereby optimizing the corresponding cell change method and parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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:

[0020] FIG1 is a schematic flow chart showing a cell switch process based on the LTM mechanism.

[0021] FIG2 is a schematic flowchart showing a method for reporting cell change information in embodiment 1 of the present disclosure.

[0022] FIG3 is a schematic flowchart showing a method for reporting cell change information in Embodiment 2 of the present disclosure.

[0023] FIG4 is a schematic flowchart showing a method for reporting cell change information in Embodiment 4 of the present disclosure.

[0024] FIG5 is a block diagram showing a user equipment UE involved in the present disclosure.

[0025] In the drawings, the same or similar structures are marked with the same or similar reference numerals. DETAILED DESCRIPTION

[0026] 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.

[0027] In this disclosure, the terms "include" and "contain" and their derivatives are intended to include but not limit; the term "or" is inclusive, meaning and / or. "If", "if", "in the case of" and "when" are interchangeable.

[0028] In this specification, the various embodiments described below for describing the principles of the present disclosure are merely illustrative and should not be construed in any way as limiting the scope of the disclosure. The following description with reference to the accompanying drawings is intended to assist in a comprehensive understanding of 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 have been omitted. In addition, throughout the drawings, the same reference numerals are used for similar functions and operations.

[0029] The following text takes the NR mobile communication system and its subsequent evolutionary versions as example application environments to specifically describe multiple implementations of the present disclosure. It should be noted that the present disclosure is not limited to the following implementations, but is applicable to many other wireless communication systems. Unless otherwise specified, the concepts of cell and base station can be replaced with each other; cell, beam, transmission point (TRP) can be replaced. Cancellation, release, deletion, clearing and clearing can be replaced. Execution, use and application can be replaced. Configuration and reconfiguration can be replaced. Monitoring (monitor) and detection (detect) can be replaced. Initiate (initiate) and trigger (trigger) can be replaced.

[0030] The following describes processes or concepts in the prior art to which this disclosure relates.

[0031] General handover process in NR system:

[0032] In NR systems up to R18, a handover refers to a change in the primary cell triggered or configured by the network. The handover command is used to trigger the UE to perform a handover. In NR systems, the traditional handover command is an RRC reconfiguration message containing the Reconfiguration with Sync information element for the Master Cell Group (MCG), so a handover is also called an MCG synchronous reconfiguration.

[0033] The general handover process includes the following stages: Stage 1: Measurement stage. The UE measures the wireless link corresponding to the serving cell or 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 handover for the UE based on the received measurement report and other factors such as 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. The UE that receives the handover command immediately applies the configuration of the handover command to perform the handover and performs a random access process to the target site. The UE uses a timer T304 to detect the handover process. 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.

[0034] LTM mechanism:

[0035] Traditional handover is triggered by a Layer 3 handover command (i.e., an RRC reconfiguration message containing a synchronous reconfiguration information element). In order to reduce data interruption caused by mobility, the 3GPP working group is currently discussing and specifying standards for the LTM mechanism. According to the conclusions reached so far, LTM can be used for service cell changes in the Master Cell Group (MCG), such as changes in the Primary Cell (PCell), and can also be used for service cell changes in the Secondary Cell Group (SCG), such as Primary Secondary Cell (PSCell). Cell changes using the LTM mechanism are called cell switches to distinguish them from traditional handovers. As shown in Figure 1, the network side sends the LTM candidate cell configuration to the UE in advance through RRC signaling (such as an RRC reconfiguration message). After receiving the configuration, the UE saves the received LTM candidate cell configuration. The candidate cell configuration includes the RRC configuration corresponding to one or more candidate cells. The network side determines the final target cell based on the layer 1 measurement results reported by the UE, and triggers the cell switch process through the Medium Access Control (MAC) signaling (such as the MAC control element (CE)). The MAC signaling used to trigger the cell switch process contains at least the indication information of the target candidate cell configuration (such as the corresponding candidate (configuration) identifier or index value). The UE triggers the cell switch process and applies the saved previously received LTM candidate cell configuration to execute the change process to the target cell. In addition, the configuration of the LTM candidate cell does not reuse the current switching command structure, that is, the RRC reconfiguration message containing the synchronization reconfiguration information element is not used.

[0036] In the LTM mechanism, to further reduce the latency of the cell change process, one feasible approach is for the network to obtain the uplink timing advance (TA) of the candidate cell before triggering the cell change. This allows the UE to omit the random access (RA) process to the target cell when it subsequently performs a cell switch to the target cell, directly using the obtained uplink TA value for uplink transmission. This approach is called early TA acquisition. The UE performs early TA acquisition for a candidate cell based on instructions / configurations from the network, as shown in Figure 1. The network can configure dedicated random access resources to the UE via a Physical Downlink Control Channel order (PDCCH order) to trigger a random access process to a candidate cell. The network records the corresponding TA and includes the TA value in the MAC signaling used to trigger the cell switch, notifying the UE. Therefore, unlike the traditional handover process in which the UE always needs to perform a random access procedure to the target cell to access the target cell and obtain uplink synchronization, in LTM, when the UE has obtained the TA of the LTM target cell in advance, the UE can directly send uplink data to the LTM target cell through dynamic scheduling or configured resources (Configured Grant, CG) without performing random access to the target cell. This cell switch process is also called RACH-less cell switch or cell switch without RA.

[0037] Another way to shorten cell change interruption latency within the LTM mechanism is to avoid performing a Layer 2 reset. Traditional handovers typically involve a Layer 2 reset, which can lead to unnecessary data interruptions. With the LTM mechanism, the UE determines whether to perform a Layer 2 reset during the cell switch process based on the Layer 2 reset configurations of the source and target cells, thereby avoiding data interruptions caused by unnecessary Layer 2 resets.

[0038] In this disclosure, handover and LTM cell switch are collectively referred to as cell change; more specifically, handover or LTM cell switch for PCell change can be collectively referred to as PCell change, and traditional PSCell change or LTM cell switch for PSCell change can be collectively referred to as PSCell change.

[0039] Successful switch report:

[0040] The NR system of version 17 introduces a handover information report upon successful handover, which is called a Successful Handover Report (SHR). SHR is used to provide the network side with mobility information related to a successfully executed handover process, so that the network side can further optimize the configuration of mobility parameters based on the information reported by the UE, and improve the handover performance, such as reducing the handover delay. SHR 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, reasons for triggering SHR, random access process information, and location information. The information configured by the network side to the UE for triggering SHR (such as the threshold values ​​corresponding to timers T310, T312, and T304, and the source cell experiencing a radio link failure RLF during the Dual Active Protocol Stack (DAPS) handover execution process) is called SHR configuration. Only when one or more trigger conditions of the configured trigger information are met (such as the percentage of the running value of T310 (or T312) of the source cell and the configured value of T310 (or T312) exceeds the configured corresponding threshold value when the handover command is received or the handover is performed, the percentage of the running value of T304 and the configured value of T304 when the handover is successfully completed exceeds the configured corresponding threshold value, and RLF occurs in the source cell during the DAPS handover execution process (when timer T304 is running)), the UE will record the handover information of the successful handover in the UE variable corresponding to the SHR (such as VarSuccessHO-Report). The UE can inform the network side through an RRC message that there is an available successful handover 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 handover information report through an RRC message (such as the successHO-ReportReq indication in the UEInformationRequest message). The UE will report the saved success handover report (successHO-Report in the UEInformationResponse message) to the network side in the response RRC message. In addition to the above handover information recorded by the UE when the handover is successful, when the UE receives the request to report the recorded handover information in the UEInformationRequest, if the handover information in the VarSuccessHO-Report is about a DAPS handover, the UE will also record the user plane interruption time during the handover (identified by the upInterruptionTimeAtHO information element) in the SHR.The user plane (UP) interruption time during handover refers to the time between the arrival of the last data packet received by the UE from the source cell and the arrival of the first non-duplicate data packet received from the target cell during handover. Here, a data packet refers to the Protocol Data Unit (PDU) of the Packet Data Convergence Protocol (PDCP) layer. The UE measures this time value when the first non-duplicate data packet arrives from the target cell. User plane measurements that include user plane interruption time are also called user plane measurements or Layer 2 measurements.

[0041] The Release 17 SHR is a SON report of successful traditional handover information. The UE triggers the recording of handover-related SHR information based on whether the configured SHR trigger conditions are met. In traditional handover, the main goal of DAPS handover is to shorten the handover interruption time. Therefore, in the SHR of the DAPS handover scenario, in addition to other handover information, the UE also records the user plane measurement information during the handover. After the LTM mechanism was introduced in Release 18, considering the differences between the aforementioned LTM process and traditional handover, how to record the corresponding cell change-related information for a successful LTM cell switch process has become an issue of concern in this disclosure.

[0042] The following embodiments provide solutions to the aforementioned issues. Unless otherwise specified, the embodiments are not mutually exclusive and can be combined, or some concepts or definitions can be shared across the embodiments. Each embodiment applies to LTM cell switch scenarios on MCGs or PCells and, unless otherwise specified, also applies to LTM cell switch procedures on SCGs or PSCells.

[0043] Example 1

[0044] This embodiment provides a method for configuring cell change information reporting executed on a UE. Through the method described in this embodiment, the UE receives a configuration from the network for triggering a cell change information report during the LTM process. This configuration allows the UE to trigger recording of cell change information reporting during a successful LTM cell switch process based on the configured trigger information, and then report this information to the network for subsequent adjustment and optimization of mobility parameters.

[0045] The following describes the embodiment 1 of the present disclosure in detail. FIG2 is a schematic flow chart showing the cell change information reporting method in the embodiment 1 of the present disclosure. As shown in FIG2 , the cell change information reporting method in the embodiment 1 of the present disclosure may include the following steps.

[0046] Step 101: The UE receives a cell change information report configuration from the network side. The cell change information report configuration includes one or more of the following trigger information:

[0047] The first trigger information is used to indicate that if the LTM cell switch process falls back from RACH-less to executing the RA process to the target cell, the UE triggers a cell change information report corresponding to the cell switch event.

[0048] Optionally, the fallback from RACH-less to executing the RA process to the target cell refers to that during the LTM cell switch process, the UE first executes the RACH-less process, expecting to send uplink data to the target cell through CG or dynamic scheduling, but for some reasons, the UE falls back from the RACH-less process to the RA process, and triggers the random access process to the target cell, and accesses the target cell through the random access process. For example, because the beam quality corresponding to the configured CG resources or dynamic scheduling resources is poor (such as lower than a predetermined threshold value), the UE cannot access the target cell through the CG resources or dynamic scheduling resources at this time, so the UE triggers the random access process to access the target cell.

[0049] The second trigger information is used to indicate that if the LTM cell change process is RACH-less, the UE records the cell change information report corresponding to this cell change process.

[0050] Optionally, when the LTM Cell Switch Command MAC CE includes valid TA information, the UE performs a RACH-less LTM cell switch procedure.

[0051] Optionally, the valid TA information refers to the time advance information contained in the LTM Cell Switch Command MAC CE, such as a time advance command (Timing Advance Command) or time advance indication information indicating that the time advance information uses a zero value or the same as the time advance amount of a serving cell; or refers to the time advance information contained in the MAC CE not being set to a special value (such as each bit of the time advance command is set to all 1s or hexadecimal FFF).

[0052] The third trigger information is used to indicate that if an L2 reset occurs / is executed during the LTM cell switch process, the UE triggers recording a cell change information report corresponding to this cell switch event.

[0053] The fourth trigger information is used to indicate that if no L2 reset occurs / is performed during the LTM cell switch process, the UE triggers recording a cell change information report corresponding to this cell switch event.

[0054] Optionally, the UE determines whether to perform an L2 reset during the LTM cell switch process by comparing the no-reset flag of the serving cell (such as configured by the ltm-ServingCellNoResetID information element) and the no-reset flag corresponding to the target LTM candidate cell (such as configured by the ltm-NoResetID information element). For example, if the no-reset flag of the serving cell is the same as the no-reset flag corresponding to the target LTM candidate cell, the UE does not perform an L2 reset during its LTM cell switch process. If the no-reset flag of the serving cell is different from the no-reset flag corresponding to the target LTM candidate cell, the UE performs an L2 reset during its LTM cell switch process.

[0055] Optionally, the cell change information report configuration is included in an RRC reconfiguration message.

[0056] Optionally, the cell change information report is a successful handover report SHR. The cell change information report configuration is included in a successHO-Config information element.

[0057] Optionally, the cell change information report configuration is configured by the target cell configuration or the source cell configuration.

[0058] Step 102: When the UE successfully completes the LTM cell switch process to the target LTM cell, the UE performs a cell change information report determination process. The determination process may include: determining whether the trigger condition is met based on one or more of the first to fourth trigger information in the cell change information report configuration; and saving the cell change information corresponding to the LTM cell switch process on the UE when the trigger condition is met.

[0059] In combination with the first trigger information in step 101, the operation of executing the determination process of the cell change information report includes: if the LTM cell switch process falls back from RACH-less to executing the RA process to the target cell, the UE records the cell change information report corresponding to this cell switch event.

[0060] In combination with the second trigger information in step 101, the operation of performing the cell change information report determination process includes: if the LTM cell switch process is RACH-less, the UE records the cell change information report corresponding to this cell switch event.

[0061] In conjunction with the third trigger information in step 101, the operation of performing the cell change information report determination process includes: if an L2 reset occurs / is performed during the LTM cell switch process, the UE records the cell change information report corresponding to this cell switch event.

[0062] In conjunction with the fourth trigger information in step 101, the operation of performing the cell change information report determination process includes: if no L2 reset occurs / is performed during the LTM cell switch process, the UE records the cell change information report corresponding to this cell switch event.

[0063] The cell change information recorded by the UE in the cell change information report corresponding to the cell switch time can refer to the cell change information described in Example 2, but the cell change information recorded by the UE in this embodiment is not limited to the cell change information described in Example 2.

[0064] Optionally, the UE stores the cell change information corresponding to this LTM cell switch process in a UE variable. Optionally, the UE variable is VarSuccessHOReport.

[0065] Example 2

[0066] This embodiment provides a method for reporting cell change information executed on a UE. Using the method described in this embodiment, upon successful completion of an LTM cell switch process, the UE records the cell change information corresponding to the LTM cell switch process in a cell change information report, which is then reported to the network for adjustment and optimization of mobility parameters based on the LTM cell switch.

[0067] The following describes the embodiment 2 of the present disclosure in detail. FIG3 is a schematic flow chart showing the cell change information reporting method in the embodiment 2 of the present disclosure. As shown in FIG3 , the cell change information reporting method in the embodiment 2 of the present disclosure may include the following steps.

[0068] Step 201: The LTM cell switch process is successfully completed, and the cell change information report confirmation process is performed.

[0069] Optionally, the successful completion of the LTM cell switch process refers to the successful completion of the random access process triggered by the LTM cell switch process, or the UE RRC layer receives an indication of successful completion of the LTM cell switch from the MAC layer. Optionally, the MAC layer indicates to the RRC layer that the LTM cell switch is successfully completed when the following conditions are met: there is an ongoing RACH-less LTM cell switch, and a downlink assignment of the C-RNTI of the MAC entity is received on the PDCCH, and the downlink assignment is a (first) new transmission after the first Physical Uplink Share Channel (PUSCH) transmission in the serving cell.

[0070] Step 202: During the determination process of performing the cell change information report, the UE includes one or more of the following contents in the cell change information report:

[0071] First cell change information, used to indicate that the cell change process is an LTM cell switch process;

[0072] The second cell change information is used to indicate user plane measurement information of the cell change process.

[0073] Optionally, in an implementation manner, when the cell change process is an LTM cell switch, the UE includes second cell change information in the report.

[0074] Optionally, in another implementation manner, when the cell change process of the UE is LTM cell switch and the cell switch process is RACH-less, the UE includes second cell change information in the report.

[0075] Optionally, in yet another implementation, when the cell change process is an LTE cell switch and no (any) layer 2 reset is performed in the cell switch process, the UE includes second cell change information in the report.

[0076] Optionally, in yet another implementation, when the cell change procedure is an LTE cell switch and (any) layer 2 reset is performed in the cell switch procedure, the UE includes second cell change information in the report.

[0077] Optionally, the user plane measurement information is user plane interruption time. Optionally, as described above, user plane interruption time refers to the time elapsed between the arrival time of the last data packet received by the UE from the source cell and the arrival time of the first data packet received from the target cell during the cell change. Optionally, the data packet here refers to a PDCP PDU. The UE measures this time value upon the arrival of the first data packet received from the target cell. Optionally, the first data packet refers to the first non-duplicate data packet.

[0078] The third cell change information is used to indicate that the triggering reason for the cell change information report is that the cell change process is RACH-less.

[0079] Optionally, when RACH-less is executed during the cell change process, the UE includes third cell change information in the cell change information report.

[0080] The fourth cell change information is used to indicate that the triggering reason for the cell change information report is that fallback from RACH-less to RA occurs.

[0081] Optionally, when fallback from RACH-less to RA occurs during the cell change process, the UE includes fourth cell change information in the cell change information report.

[0082] The fifth cell change information is used to indicate that the triggering cause of the cell change information report is that a layer 2 reset is performed during the cell change process.

[0083] Optionally, when a layer 2 reset is performed during the cell change process, the UE includes fifth cell change information in the cell change information report.

[0084] The sixth cell change information is used to indicate that the triggering reason for the cell change information report is that a layer 2 reset is not performed during the cell change process.

[0085] Optionally, when layer 2 reset is not performed during the cell change process, the UE includes sixth cell change information in the cell change information report.

[0086] The seventh cell change information is used to indicate the source cell information of the cell change process. The source cell information is the identifier or measurement value (such as the reference signal received power RSRP measurement result) of the source cell.

[0087] The eighth cell change information is used to indicate target cell information of the cell change process. The target cell information is an identifier or a measurement value of the target cell.

[0088] Optionally, in step 202 or step 201, the UE determines to perform a cell change information report or includes the first to eighth cell change information in the cell change information report when the UE is configured with cell change information report configuration information and one or more trigger conditions in the configuration are met. Optionally, the configuration or trigger condition related to the cell change information report is the configuration or trigger condition (first to fourth trigger information) described in step 101 or 102 in Example 1. Optionally, the cell change information report-related configuration reuses the configuration in the existing SHR, specifically as follows: for the successfully completed LTM cell switch process, if the ratio of the elapsed value (elapsed time) of timer T304 to the configured value of T304 configured in the target cell is greater than the threshold value TH1 in the cell change information report configuration, the UE executes step 202; or if the ratio of the elapsed value (elapsed time) of timer T310 to the configured value of T310 configured in the source cell before the cell switch process is greater than the threshold value TH2 in the cell change information report configuration, the UE executes step 202; or if the ratio of the elapsed value (elapsed time) of timer T312 to the configured value of T312 configured in the source cell before the cell switch process is greater than the threshold value TH3 in the cell change information report configuration, the UE executes step 202. It is worth noting that the configuration or triggering condition related to the cell change information report is not limited in this embodiment.

[0089] Optionally, the cell change information report is a successful handover report SHR.

[0090] Optionally, before step 201, the UE receives an LTM Cell switch command from the network and performs a cell switch process.

[0091] Example 3:

[0092] This embodiment provides another method for reporting cell change information executed on a UE. Unlike in Embodiment 2, in which the UE includes cell change-related information in a cell change information report upon successfully completing an LTM cell switch, in this embodiment, upon receiving a UEInformationRequest message, the UE includes cell change-related information in a cell change information report and sends the information to the network via a UEInformationResponse message.

[0093] The cell change information report of embodiment 3 of the present disclosure includes the following steps:

[0094] Step 301: The UE receives a UE information request UEInformationRequest message from the network side.

[0095] Step 302: If the UEInformationRequest message carries an indication requesting the UE to report the saved cell change information report (such as the indication is set to true), and there is a saved cell change information report on the UE, if the content of the cell change information report is associated with an LTM cell switch process, then the UE includes user plane measurement information in the cell change information report.

[0096] Optionally, the user plane measurement information is as described in Example 2 and is not described again here.

[0097] Optionally, further, if the content in the cell change information report is associated with an LTM cell switch process, and the LTM cell switch process is RACH-less, then the UE includes user plane measurement information in the cell change information report.

[0098] Optionally, further, if the content in the cell change information report is associated with an LTM cell switch process, and the LTM cell switch process occurs RACH-less to RA fallback, then the UE includes user plane measurement information in the cell change information report.

[0099] Optionally, further, if the content in the cell change information report is associated with an LTM cell switch process, and a layer 2 reset is performed in the LTM cell switch process, the UE includes user plane measurement information in the cell change information report.

[0100] Optionally, further, if the content in the cell change information report is associated with an LTM cell switch process and no layer 2 reset is performed in the LTM cell switch process, the UE includes user plane measurement information in the cell change information report.

[0101] Optionally, the cell change information report is a successful handover report SHR.

[0102] Example 4

[0103] This embodiment provides a method for reporting cell change information executed on a UE. Using the method described in this embodiment, the UE can report the relevant information in the aforementioned embodiments to the base station in a cell change information report, thereby providing more accurate cell change information to the network. This embodiment provides a method for a UE to report the cell change information report described in Embodiment 1, Embodiment 2, or Embodiment 3 through an RRC procedure.

[0104] The following describes the embodiment 4 of the present disclosure in detail. FIG4 is a schematic flow chart showing a cell change information reporting method in the embodiment 4 of the present disclosure. As shown in FIG4 , the cell change information reporting method in the embodiment 4 of the present disclosure may include the following steps.

[0105] Step 401: The UE receives a UEInformationRequest message from the network side, which carries an indication / request for requesting the UE to report the stored cell change information report (eg, the corresponding information element is set to true).

[0106] Step 402: The UE includes the content of the stored cell change information report in a UEInformationResponse message and sends the UEInformationResponse message to the network side. The cell change information report included in the RRC message includes one or more of the first to eighth cell change information in the aforementioned embodiment 2 or the user plane measurement information in embodiment 3.

[0107] Optionally, the cell change information report is a successful handover report SHR. The indication / request for requesting the UE to report the stored cell change information report is a successHO-ReportReq information element set to true.

[0108] Example 5

[0109] This embodiment illustrates the user equipment UE of the present disclosure. Figure 5 is a block diagram of the user equipment UE involved in the present disclosure. As shown in Figure 5, 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 memory. The memory 102 stores program instructions. When the instructions are executed by the processor 101, the above-mentioned cell change information reporting method described in detail in the present invention can be executed.

[0110] The method and related devices of the present disclosure have been described above in conjunction with preferred embodiments. Those skilled in the art will appreciate that the method shown above is merely exemplary. The method of the present disclosure 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 will be developed in the future and can be used for the base station, MME, or UE, etc. The various identifiers shown above are merely exemplary and not restrictive, and the present disclosure 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.

[0111] The program running on the device according to the present disclosure may be a program that controls a central processing unit (CPU) to enable a computer to implement the functions of the embodiments of the present disclosure. The program or the 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.

[0112] The program for realizing each embodiment function of the present disclosure can be recorded on a computer-readable recording medium. The corresponding function 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 short-term dynamic storage program recording medium or any other recording medium that is computer-readable.

[0113] The various features or functional modules of the devices used in the above embodiments can be implemented or executed by circuits (e.g., single-chip or multi-chip integrated circuits). The circuits designed to perform the functions described in this specification may include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete 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.

[0114] Furthermore, the present disclosure is not limited to the above-described 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.

[0115] As described 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-mentioned 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 modifications can be made to the present disclosure within the scope of the claims, and 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, components with the same effect described in the above-mentioned embodiments can be replaced with each other.

Claims

1. A method for reporting cell change information, comprising: The user equipment UE receives configuration information for triggering a cell change information report from the network side; When the UE successfully completes the layer 1 and layer 2 triggered mobility LTM cell change process to the target cell, a determination operation of a cell change information report is performed based on the configuration information for triggering the cell change information report, the determination operation comprising: including one or more of the following information in the cell change information report: First cell change information, used to indicate that the cell change process is an LTM cell change process; Second cell change information, used to indicate user plane measurement information of the cell change process; The third cell change information is used to indicate that the triggering reason for the cell change information report is that the cell change process is RACH-less; The fourth cell change information is used to indicate that the triggering cause of the cell change information report is that a fallback from no random access RACH-less to random access RA occurs; fifth cell change information, used to indicate that the triggering cause of the cell change information report is that a layer 2 reset is performed during the cell change process; sixth cell change information, used to indicate that the triggering cause of the cell change information report is that a layer 2 reset is not performed during the cell change process; seventh cell change information, used to indicate source cell information of the cell change process; The eighth cell change information is used to indicate the target cell information of the cell change process.

2. The method for reporting cell change information according to claim 1, wherein: The configuration information for triggering a cell change information report includes one or more of the following information: The first trigger information is used to indicate that if a fallback from no random access RACH-less to a random access RA process to a target cell occurs during the LTM cell change process, the UE records a cell change information report corresponding to this cell change process; The second trigger information is used to indicate that if the LTM cell change process is RACH-less, the UE records the cell change information report corresponding to this cell change process; The third trigger information is used to indicate that if a layer 2 reset is performed during the LTM cell change process, the UE triggers recording of a cell change information report corresponding to the LTM cell change process; The fourth trigger information is used to indicate that if the layer 2 reset is not performed during the LTM cell change process, the UE records the cell change information report corresponding to this LTM cell change process.

3. The method for reporting cell change information according to claim 1, wherein: When the cell change process is an LTM cell change and the cell change process is RACH-less, the UE includes second cell change information in the cell change information report; or, When the cell change process is an LTM cell change and a layer 2 reset is not performed during the cell change process, including second cell change information in the cell change information report; or, When the cell change process is an LTM cell change and a layer 2 reset is performed in the cell change process, second cell change information is included in the cell change information report.

4. The method for reporting cell change information according to claim 1, wherein: The UE receives a UE information request UEInformationRequest message from the network side; If the UEInformationRequest message carries an indication requesting the UE to report a stored cell change information report, and the UE has a stored cell change information report associated with an LTM cell change, the user plane measurement information is included in the cell change information report.

5. The method for reporting cell change information according to claim 4, wherein: If the cell change information report is associated with an LTM cell change process and the LTM cell change process has a random access RACH-less to random access RA fallback to the target cell, the user plane measurement information is included in the cell change information report; or, If the cell change information report is associated with an LTM cell change process and the LTM cell change process is RACH-less, the user plane measurement information is included in the cell change information report; or, If the cell change information report is associated with an LTM cell change process and the LTM cell change process performs a layer 2 reset, the user plane measurement information is included in the cell change information report; or, If the cell change information report is associated with an LTM cell change process and the LTM cell change process does not perform a layer 2 reset, the user plane measurement information is included in the cell change information report.

6. The method for reporting cell change information according to claim 1 or 4, wherein: The user plane measurement information is the user plane interruption time; The user plane interruption time is the time between the arrival time of the last data packet received by the UE from the source cell and the arrival time of the first data packet received by the UE from the target cell when the cell is changed.

7. The method for reporting cell change information according to claim 1, wherein: The successful completion of the LTM cell change process is the successful completion of the random access RA process triggered by the LTM cell change process; or, The radio resource control RRC layer receives an indication of successful completion of the LTM cell change from the media access control MAC layer.

8. The method for reporting cell change information according to claim 1, wherein: The cell change information report is a successful handover report SHR; the cell change information report configuration is included in the successHO-Config information element.

9. The method for reporting cell change information according to claim 1, wherein: The cell change 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 a stored cell change information report; and The UE includes the content of the stored cell change information report in a UE information response UEInformationResponse message and sends it to the network side.

10. A user equipment, comprising: processor; as well as A memory, wherein instructions are stored in the memory; When the instruction is executed by the processor, the user equipment executes the cell change information reporting method according to any one of claims 1-9.

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