Cell change information reporting method and user equipment

Abstract

The invention provides a cell change information reporting method and user equipment. The method for reporting the cell change information comprises the following steps that: user equipment UE successfully completes a process of triggering a mobility cell change LTM cell switch to a layer 1 and a layer 2 of a target cell, and the UE executes a determination operation of the cell change information report; wherein the determination operation of executing the cell change information report comprises the steps of initiating a record of the cell change information report, and setting user plane measurement information in the cell change information report.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wireless communications, and more specifically, 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] The purpose of optimizing network performance can be achieved through network optimization in wireless networks. Generally, data collection and data analysis are performed on the existing deployed and running networks to find out the reasons affecting the network quality, and the network performance is improved by modifying the configured network parameters, adjusting the network structure and the deployed equipment. For self-configuration and self-optimization network (SON), it refers to the process of automatically adjusting the network based on the measurement / performance measurement of user equipment and / or base stations. The network side can configure the UE to perform measurements for SON. SON functions include many aspects, such as the automatic neighbor relationship function (ANR) for reducing the neighbor management burden of the operator, the mobile load balancing function (MLB) for balancing the responsibilities between different cells, the mobility robustness optimization function (MRO) for optimizing mobility performance, the random access channel optimization function for optimizing random access channel parameters, and the radio link failure reporting function for optimizing coverage and MRO.

[0003] In the NR system, the Radio Link Failure (RLF) report is used to record the relevant information of the UE side when a link failure occurs; the Successful Handover Report (SHR) is used to record the relevant information of 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 the Layer 1 / L2-triggered mobility (LTM) mechanism is being discussed in the NR system of version 18. The purpose of this mechanism is to reduce mobility latency. In NR systems 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, 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 the NR network, and further, to implement the SON reporting problem in the scenario of successful cell change in the network supporting LTM. Summary of the invention

[0006] The purpose of the embodiments of the present disclosure is to propose a solution to the problem of how to implement the cell change information report when the cell change is successful under the LTM mechanism in the NR system. More specifically, the present disclosure proposes a solution for how to trigger the cell change information report after the UE performs the LTM cell change and how to record the corresponding cell change information in the cell change information report. The present disclosure provides a method for performing a cell change information report in a user equipment and a corresponding user equipment.

[0007] According to a first aspect of the present disclosure, a cell change information reporting method is proposed, comprising: a user equipment UE receives configuration information for triggering a cell change information report from a network side; when the UE successfully completes a layer 1 layer 2 triggered mobility LTM cell change process to a target cell, a determination operation of a cell change information report is performed based on the configuration information for triggering a 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; third cell change information, used to indicate that the cell The triggering cause of the change information report is that the cell change process is RACH-less without random access; the fourth cell change information is used to indicate that the triggering cause of the cell change information report is the 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 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 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.

[0008] 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 recording of the cell change information report corresponding to this 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 this LTM cell change process.

[0009] 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 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 during 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 during the cell change process, the second cell change information is included in the cell change information report.

[0010] 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.

[0011] 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 performed 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 no random access 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.

[0012] In the cell change information reporting method of the first aspect above, optionally, 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 from the target cell when the cell changes.

[0013] 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 wireless resource control RRC layer receives an indication of the successful completion of the LTM cell change from the media intervention control MAC layer.

[0014] 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.

[0015] 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.

[0016] 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 according to the context.

[0017] Beneficial Effects

[0018] The present disclosure proposes a solution to the problem of how to implement the reporting of cell change information in a successful LTM cell switch process scenario. Through the method described in the present disclosure, the UE can determine whether to record and record corresponding cell change information such as user plane measurement information during a successful LTM cell switch process based on the configuration information of the configured successful LTM cell switch information reporting. When the network side can determine whether the mobile robustness of LTM or the cell change interruption time can be further optimized based on the cell change information corresponding to the LTM cell switch reported by the UE, the corresponding cell change method and parameters can be optimized. 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] Figure 1 It is a schematic flow chart showing the cell switch process based on the LTM mechanism.

[0021] Figure 2 It is a schematic flowchart showing the cell change information reporting method in Embodiment 1 of the present disclosure.

[0022] Figure 3 It is a schematic flowchart showing the cell change information reporting method in Embodiment 2 of the present disclosure.

[0023] Figure 4 It is a schematic flowchart showing the cell change information reporting method in Example 4 of the present disclosure.

[0024] Figure 5 Detailed description of the invention 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 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.

[0028] 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.

[0029] The following takes the NR mobile communication system and its subsequent evolutionary versions as example application environments, and specifically describes multiple implementations according to the present disclosure. It should be noted that the present disclosure is not limited to the following implementations, but is applicable to more other wireless communication systems. Unless otherwise specified, the concepts of cell and base station can be replaced with each other; cell, beam (beamn), transmission point (TransmissionPoint, 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 the present disclosure relates.

[0031] General switching process in NR system:

[0032] In NR systems up to R18, handover refers to the change of the primary cell triggered or configured by the network side. The handover command is used to trigger the UE to perform a handover. In the NR system, the traditional handover command is an RRC reconfiguration message containing the Reconfiguration with sync information element for the Master Cell Group (MCG), so handover is also called 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 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 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. Figure 1 As shown, the network side sends the LTM candidate cell configuration to the UE in advance through RRC signaling (such as RRC reconfiguration message). After receiving the configuration, the UE saves the received LTM candidate cell configuration. The candidate cell configuration includes one or more RRC configurations corresponding to the 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 media access control (MAC) signaling (such as MAC control element (CE)). The MAC signaling used to trigger the cell switch process at least includes the indication information of the target candidate cell configuration (such as the corresponding candidate (configuration) identifier or index value). The UE triggers the cellswitch 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, in order to further reduce the latency of the cell change process, a feasible method is that the network side can obtain the uplink timing advance (TA) of the candidate cell in advance before triggering the cell change, so that when the UE subsequently performs the cell switch process to the target cell, the random access (RA) process to the target cell can be omitted, and the acquired uplink TA value can be directly used for uplink transmission. This method can be called early TA acquisition. The UE performs early TA acquisition of a candidate cell based on the instructions / configuration of the network side, for example Figure 1As shown. The network side can configure dedicated random access resources to the UE through a physical downlink control channel order (PDCCH order) to trigger a random access process to a candidate cell. The network side records the corresponding TA obtained, and includes the TA value in the MAC signaling used to trigger the cell switch to inform the UE. Therefore, unlike the traditional switching process in which the UE always needs to perform a random access process 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 can also be called a RACH-less cell switch or cell switch without RA.

[0037] In addition, another method to shorten the cell change interruption delay in the LTM mechanism is to avoid performing a layer 2 reset. The traditional handover process is generally accompanied by a layer 2 reset, which directly leads to some unnecessary data interruptions. In the LTM mechanism, the UE determines whether to perform a layer 2 reset during the cell switch process based on the configuration of the layer 2 reset of the source cell and the target cell, thereby avoiding data interruptions caused by unnecessary layer 2 resets.

[0038] In the present disclosure, switching and LTM cell switch are collectively referred to as cell change; more specifically, switching or LTM cell switch used for PCell change may be collectively referred to as PCell change, and traditional PSCell change or LTM cell switch used for PSCell change may 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, 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 used to trigger SHR configured by the network side to the UE (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 when the switching command is received or the switching is performed, the percentage of the running value of T310 (or T312) of the source cell to the configured value of T310 (or T312) exceeds the configured corresponding threshold value, the percentage of the running value of T304 to the configured value of T304 when the switching is successfully completed exceeds the configured corresponding threshold value, and RLF occurs in the source cell during the DAPS switching execution process (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). 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 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 (upInterruptionTimeAtHO information element identifier) ​​during the handover in the SHR.The user plane (UP) interruption time during handover refers to 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 non-duplicate data packet received from the target cell during handover. The data packet here 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 including user plane interruption time are also called user plane measurements or layer 2 measurements.

[0041] The SHR of version 17 is a SON report of information on successful traditional handovers. The UE triggers the recording of handover-related SHR information based on whether the configured SHR trigger conditions are met. In traditional handovers, the main goal of DAPS handovers is to shorten the handover interruption time. Therefore, in the SHR under 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 version 18, considering the difference between the aforementioned LTM process and traditional handovers, how to record the corresponding cell change-related information for a successful LTM cell switch process has become a concern of the present disclosure.

[0042] 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. Each embodiment is applicable to the LTM cell switch scenario on MCG or PCell. Unless otherwise specified, it is also applicable to the LTM cell switch process on SCG or PSCell.

[0043] Example 1

[0044] This embodiment provides a configuration method for cell change information reporting executed on a UE. Through the method described in this embodiment, the UE receives a configuration for triggering a cell change information report record in an LTM process from the network side, so that the UE can trigger recording of the relevant information of the cell switch time based on the configured trigger information after the LTM cell switch process is successful, and report it to the network side for subsequent adjustment and optimization of mobility parameters.

[0045] Hereinafter, Example 1 of the present disclosure will be described in detail. Figure 2 is a schematic flow chart showing a method for reporting cell change information in Embodiment 1 of the present disclosure, such as Figure 2As shown, the cell change information reporting method in 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 a fallback from RACH-less to executing an RA process to a target cell occurs during the LTM cell switch process, the UE triggers a cell change information report corresponding to the cell switch event.

[0048] Optionally, the fallback from RACH-less to RA process to the target cell refers to that in 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 not good (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 certain service cell; or it refers to the time advance information contained in the MAC CE not setting 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 (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 (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.

[0054] Optionally, the UE determines whether to perform L2 reset in the LTM cell switch process by comparing the no-reset flag of the serving cell (such as configured with the ltm-ServingCellNoResetID information element) and the no-reset flag corresponding to the target LTM candidate cell (such as configured with 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 L2 reset in 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 L2 reset in 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 the operation of the determination process of the cell change information report. The operation of the determination process may include: judging 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 this 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 determination process of the cell change information report 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 combination with the third trigger information in step 101, the operation of performing the determination process of the cell change information report 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 cellswitch event.

[0062] In combination with the fourth trigger information in step 101, the operation of executing the determination process of the cell change information report includes: if no L2 reset occurs / is executed 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 the current LTM cell switch process in a UE variable. Optionally, the UE variable is VarSuccessHOReport.

[0065] Example 2

[0066] This embodiment provides a cell change information reporting method executed on a UE. Through the method described in this embodiment, when the LTM cell switch process is successfully completed, the UE records the cell change information corresponding to this LTM cellswitch process in the cell change information report, and reports it to the network side for adjustment and optimization of mobility parameters based on the LTM cell switch.

[0067] Hereinafter, Example 2 of the present disclosure will be described in detail. Figure 3is a schematic flow chart showing a method for reporting cell change information in Embodiment 2 of the present disclosure, such as Figure 3 As shown, the cell change information reporting method in Embodiment 2 of the present disclosure may include the following steps.

[0068] Step 201: successfully complete the LTM cell switch process and execute the determination process of the cell change information report.

[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 the 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 (downlink assignment) of the C-RNTI of the MAC entity is received on the PDCCH, and the downlink assignment is the (first) new transmission (new transmission) after the first physical uplink shared channel (PUSCH) is sent in the serving cell.

[0070] Step 202: In the process of determining 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 cellswitch, 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 an LTM cell switch and the cell switch process is RACH-less, the UE includes the 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 the user plane interruption time. Optionally, as mentioned above, the user plane interruption time refers to 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. Optionally, the data packet here refers to the PDCP PDU. The UE measures the time value when the first data packet arrives 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 in 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 cause of the cell change information report is that a fallback from RACH-less to RA occurs.

[0081] Optionally, when fallback from RACH-less to RA execution 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 cause of the cell change information report is that the 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 the 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 configuration related to the cell change information report 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 (elapsedtime) of timer T304 and the configuration 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 (elapsedtime) of timer T310 and the configuration 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 (elapsedtime) of timer T312 and the configuration 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 mentioning 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 also includes receiving an LTM Cell switch command from the network and executing a cell switch process.

[0091] Embodiment 3:

[0092] This embodiment provides another method for reporting cell change information executed on a UE. Different from Embodiment 2, in which the UE includes the cell change related information in the cell change information report when the LTM cell switch is successfully completed, in this embodiment, when the UE receives the UEInformationRequest message, the UE includes the cell change related information in the cell change information report and sends the information to the network side via the UEInformationResponse.

[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 Embodiment 2 and will not be repeated 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 cellswitch process, and the LTM cell switch process has 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 cellswitch process, and a layer 2 reset is performed in the LTM cell switch process, then 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 cellswitch process, and layer 2 reset is not performed in the LTM cell switch process, then 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. Through the method described in this embodiment, the UE can report the relevant information in the above-mentioned embodiment to the base station in the cell change information report to provide more accurate cell change information to the network side. This embodiment provides a method for the UE to report the cell change information report described in embodiment 1, embodiment 2 or embodiment 3 through the RRC process.

[0104] Hereinafter, Example 4 of the present disclosure will be described in detail. Figure 4 is a schematic flow chart showing a method for reporting cell change information in Embodiment 4 of the present disclosure, such as Figure 4 As shown, the cell change information reporting method in 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 saved cell change information report in a UEInformationResponse message and sends a 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 describes the user equipment UE of the present disclosure. Figure 5 is a block diagram showing a user equipment UE involved in the present disclosure. Figure 5As shown, 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. 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 may be executed.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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

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 without random access RACH-Iess; 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 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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