CN117545029A

CN117545029A - Handover information reporting method and user equipment

Info

Publication number: CN117545029A
Application number: CN202210924426.0A
Authority: CN
Inventors: 常宁娟; 刘仁茂
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2022-08-02
Filing date: 2022-08-02
Publication date: 2024-02-09
Also published as: WO2024027704A1

Abstract

The disclosure provides a handover information reporting method and user equipment. The handover information reporting method includes: the User Equipment (UE) receives a Successful Handover Report (SHR) configuration containing first trigger information from a network side; when the UE successfully completes the switching process to the target cell, the UE executes an operation for the SHR determining process; wherein, the first trigger information is used for indicating: if the UE fails to listen before continuously transmitting LBT triggered at least one upstream bandwidth portion BWP of the target cell during the handover procedure during the running of the timer T304, the UE generates SHR when the handover procedure to the target cell is successfully completed.

Description

Handover information reporting method and user equipment

Technical Field

The present disclosure relates to the field of wireless communication technologies, and more particularly, to a handover information reporting method and corresponding user equipment in a case of performing handover in wireless communication.

Background

A new study of Release 18 technical standards was approved at the third Generation partnership project (3rd Generation Partnership Project:3GPP) RAN#94e, 12, month 2021 (see non-patent literature: RP-213553:New WID on further enhancement of data collection for SON (Self-Organising Networks)/MDT (Minimization of Drive Tests) in NR and EN-DC). The aim of this project was to further enhance the network data collection process in the NR system based on release 17 to better achieve the aim of self-organizing self-optimizing networks and minimizing drive tests. One of the specific techniques studied is to implement a mobility performance optimization mechanism under the NR-Unlcensed (NR-U) mechanism.

The present disclosure proposes a solution to the problem of how to implement handover information reporting under the NR-U mechanism in NR systems.

Disclosure of Invention

An object of embodiments of the present disclosure is to propose a solution to the problem of how to implement handover information reporting under the NR-U mechanism in an NR system. More specifically, the present disclosure proposes a solution for how to trigger a handover information report for a handover event in which a listen before transmit (Listen Before Talk, LBT) failure recovery parameter is configured and LBT failure recovery occurs and how to record corresponding handover information in the handover information report in an NR-U network using a shared spectrum. The present disclosure provides a method of handover information reporting performed in a user equipment and a corresponding user equipment.

According to a first aspect of the present disclosure, a handover information reporting method is provided, including: the User Equipment (UE) receives a Successful Handover Report (SHR) configuration containing first trigger information from a network side; when the UE successfully completes the switching process to the target cell, the UE executes an operation for the SHR determining process; wherein, the first trigger information is used for indicating: if the UE triggers a consecutive LBT failure for at least one uplink BWP of the target cell during the handover procedure during the T304 operation, the UE generates SHR when the handover procedure to the target cell is successfully completed.

In the handover information reporting method of the first aspect, preferably, the first trigger information is set to true, and is used for indicating: if the UE triggers a consecutive LBT failure for all uplink BWP of the target cell during the handover procedure during the T304 operation, the UE generates SHR when the handover procedure to the target cell is successfully completed.

In the handover information reporting method of the first aspect, preferably, the first trigger information further includes an integer N for indicating: if the number of uplink BWP to the target cell that trigger consecutive LBT failure during the handover procedure (T304 operation period) is greater than or equal to N, the UE generates SHR when the handover procedure to the target cell is successfully completed.

In the handover information reporting method of the first aspect, preferably, the first trigger information is configured by a target cell of a handover procedure; the uplink BWP is an uplink BWP configured with PRACH resources.

In the handover information reporting method of the first aspect, preferably, the operation for the SHR determination procedure includes: judging whether a trigger condition is satisfied based on the trigger information in the SHR configuration, and storing the SHR and setting the content in the corresponding SH R when the trigger condition is satisfied.

In the above handover information reporting method of the first aspect, preferably, the SHR successful handover information includes at least one of the following information: the method comprises the steps of first SHR information, wherein the trigger reason of the SHR information is that at least one uplink BWP of a target cell triggers continuous LBT failure in a switching process; or first SHR information, configured to indicate that a trigger reason of the SHR is that all uplink BWP of the target cell trigger continuous LBT failure in a handover process; or first SHR information, configured to indicate that a trigger reason of the SHR is that a number of uplink BWP that trigger continuous LBT failure on a target cell is greater than or equal to N; the second SHR information comprises a measurement result for indicating RSSI by reference signal strength when the switching is successfully completed; third SHR information indicating an identification of one or more uplink BWP in the handover process that triggered a continuous LBT failure for the target cell; fourth SHR information including LBT failure recovery configuration parameters.

In the above-described handover information reporting method of the first aspect, preferably, the handover information reporting method further includes: the UE receives a UEInformationRequest message from a network side, wherein the UEInformationRequest message carries an instruction/request for requesting the UE to report the stored SHR; and the UE includes the stored content in the SHR in a UEInformationResponse message and sends a UEInformationRespons e message to a network side.

According to a second aspect of the present disclosure, there is provided a handover information reporting method, including: the User Equipment (UE) receives a Successful Handover Report (SHR) configuration containing a timer T304 percentage threshold value from a network side; when the UE successfully completes a handover procedure to a target cell, the UE performs operations for a SHR determination procedure, including; if the percentage of the running value of T304 and the configuration value of T304 exceeds the configured corresponding threshold value when the switching is successfully completed, the NR-U specific information of the switching event is stored in the SHR.

In the handover information reporting method according to the second aspect, preferably, the NR-U specific information included in the SHR includes at least one or more of the following information: the second SHR information comprises a measurement result for indicating RSSI by reference signal strength when the switching is successfully completed; third SHR information indicating an identification of one or more uplink BWP in the handover process that triggered a continuous LBT failure for the target cell; fourth SHR information including LBT failure recovery configuration parameters; fifth SHR information indicating that at least one uplink BWP to the target cell triggers an indication of consecutive LBT failure in the handover procedure; sixth SHR information indicating that all uplink BWP to the target cell trigger an indication of consecutive LBT failure during handover.

According to a third aspect of the present disclosure, there is provided a user equipment, UE, comprising: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, perform a handover information reporting method as described above and below.

Drawings

For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:

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

Fig. 2 is a schematic flowchart showing a handover information reporting method in embodiment 2 of the present disclosure.

Fig. 3 is a schematic flowchart showing a handover information reporting method in embodiment 3 of the present disclosure.

Fig. 4 is a block diagram showing a user equipment UE to which the present disclosure relates.

In the drawings, the same or similar structures are identified by the same or similar reference numerals.

Detailed Description

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

In the present disclosure, the terms "include" and "comprise," along with their derivatives, are intended to be inclusive, rather than limiting; the term "or" is inclusive, meaning and/or.

In this specification, the various embodiments described below for the purpose of describing the principles of the present disclosure are illustrative only 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 provided to assist in a comprehensive understanding of exemplary embodiments of the present disclosure defined by the claims and their equivalents. The following description includes numerous specific details to aid in understanding, but these details should be construed as exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness. Furthermore, the same reference numerals are used for similar functions and operations throughout the drawings.

Various embodiments in accordance with the present disclosure are described in detail below with a long term evolution system (Long Term Evolution, LTE)/NR mobile communication system and its subsequent evolutions as an example application environment. However, the present disclosure is applicable to still other wireless communication systems. If not specified, the concepts of the cell and the base station may be interchanged; LTE may be replaced with evolved universal terrestrial radio access (Evolved Universal Terrestrial Radio Access, E-UTRA) or evolved universal terrestrial radio access network E-UTRAN. The handover refers to a change of a primary cell initiated by a network side, and includes a change of the primary cell between cells and a change of the primary cell in a cell, that is, the source cell and the target cell may be the same cell or different cells. The source Cell may also be referred to as a source base station, or source beam (beam), source transmission point (Transmission point, TRP), source Primary Cell (PCell), source Primary Cell group (Master Cell Group, MCG); the target cell may also be referred to as a target base station, or a target beam, a target transmission point, a target primary cell PCell, a target primary cell group MCG. The source cell refers to a cell serving the UE connected before the handover procedure is initiated, i.e., a cell transmitting a radio resource control (Radio Resource Control, RRC) message containing a handover command to the UE. The target cell refers to a cell connected to the UE after the handover procedure is successfully completed, serving the UE, and the cell indicated by the target cell identifier included in the handover command, or a cell described as performing downlink synchronization and random access in the handover procedure. The handover command is used to trigger the UE to perform handover, and in the NR system, the handover command is an RRC reconfiguration message including a synchronization reconfiguration (reconfiguration wisync) information element, and further, the handover command is an RRC reconfiguration message including a synchronization reconfiguration (reconfiguration wisync) information element for the primary cell group MCG. At this time, the handover may also be referred to as synchronous reconfiguration of the MCG. In the LTE system is an RRC connection reconfiguration message containing a mobile control information (MobilityControlInfo) information element. The synchronization reconfiguration information element or the mobility control information element may include configuration information of the target cell, for example, a target cell identifier, a target cell frequency, a common configuration of the target cell, such as system information, a random access configuration used by the UE to access the target cell, a security parameter configuration of the UE in the target cell, a radio bearer configuration of the UE in the target cell, and the like. For convenience of description, the RRC reconfiguration message and the RRC connection reconfiguration message are identical in the present disclosure; similarly, the response message RRC reconfiguration complete message is identical to the RRC connection reconfiguration complete message. The handover command is identical to the RRC message containing the handover command, and refers to an RRC message or configuration in the RRC message that triggers the UE to perform handover. The handover configuration refers to all or part of the configuration in the handover command. Cancel, release, delete, empty, clear, etc. may be replaced. Execution, use, and application alternatives. Configuration and reconfiguration may be replaced. Monitoring (monitor) and detection (detect) may be substituted.

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

Handover configuration in NR system:

in NR systems, the RRC reconfiguration message for the handover command carries RRC configurations from the target base station, including but not limited to the following RRC configurations (see section 6.2.2 in 3GPP technical standard protocol 38.331 for details):

-measurement configuration (measconfig information element): for configuring intra-frequency, inter-frequency and inter-radio access technology measurements performed by the UE. Such as measurement object configuration, measurement report configuration, measurement gap (gap) configuration, etc.

Cell group configuration (cellGroupConfig information element) for configuring a primary cell group or a secondary cell group. Including radio link control (Radio Link Control, RLC) bearer configuration (RLC-beardetoraddmodlist information element and RLC-beardetorelesellist information element) corresponding to the data radio bearer/signaling radio bearer, medium access control (Medium Access Control, MAC) configuration (MAC-cell group configuration), physical layer configuration, secondary cell addition/modification/release configuration, special cell (SpCel 1) configuration, and the like. The SpCell configuration includes a cell index number, handover information (reconfiguration wisync information element), a radio link failure related timer and constant configuration, a radio link detection (Radio Link Monitoring, RLM) configuration, a special cell dedicated configuration, and the like. The reconfiguration wisync information element is similar to the mobile control information in the LTE system, and includes handover related information to implement mobility, which includes serving cell configuration public information, a cell radio network temporary identifier C-RNTI of the UE in the target cell, a handover procedure monitoring timer T304 configuration, a random access dedicated configuration for a random access procedure to the target cell, and so on.

-non access stratum specific information (dedioditeinfonaslist information element).

-radio bearer configuration (radiobearconfig information element) for configuring the service data application protocol layer (Service Data Application Protocol, SDAP) and the packet data convergence protocol layer (Packet Data Convergence Protocol, PDCP) of the data radio bearer (Data Radio Bearer, DRB) and/or the signaling radio bearer (Signaling Radio Bearer, SRB).

-master key update configuration (masterkey update information element).

Handover procedure in NR system:

the user mobility in the connected state is mainly achieved through a handover procedure, that is, a procedure in which the UE in the RRC connected state changes the serving cell (primary cell). The general handover procedure comprises the following phases: stage 1: and (3) a measuring stage. And the UE measures the wireless links corresponding to the serving cell or the adjacent cells based on the configured measurement configuration, and when the configured measurement reporting condition is met, the UE sends a measurement report to the base station. Stage 2: and a switching preparation stage. The base station determines to trigger the handover for the UE in combination with the received measurement report and other factors such as the load of the base station, and the source base station and the target base station acquire the handover command configured by the target base station through the handover preparation process. Stage 3: and switching an execution stage. The source base station issues a switching command to the UE, and the UE receiving the switching command immediately applies the configuration of the switching command to execute switching. The UE detects a switching process through a timer T304, and when the switching process is initiated, the UE starts the T304 timer; when the handover procedure is completed (the random access procedure is successfully completed), the UE stops the timer T304; when T304 times out, the UE considers the handover failed.

LBT failure recovery mechanism:

unlicensed spectrum is used in NR-U networks, where these spectrum/frequencies are shared, i.e. other communication systems such as WIFI, bluetooth, etc. may operate on these spectrum in addition to 3 GPP. Therefore, the physical layer of the UE performs an LBT procedure before transmitting data, and if it is monitored that the channel is occupied, the physical layer does not perform data transmission. When the physical layer performs an LBT procedure before one data transmission and does not perform the transmission, the physical layer transmits an LBT failure indication to the medium access control (Medium Aceess Control, MAC) layer.

When the UE is configured with LBT failure recovery related parameters (as contained in the LBT-failurerecovery config information element), the UE may perform an LBT failure recovery mechanism. The relevant parameters include: LBT failure monitoring timer bt-FailureDetectionTimer and LBT failure instance maximum number LBT-FailureInstanceMaxCount. The latter is used to determine how many times the MAC layer receives LBT failure indications from the physical layer before triggering the uplink LBT failure recovery procedure. The configuration of these parameters is configured per upstream BandWidth Part (BWP). In the continuous LBT failure monitoring process, the UE maintains a UE variable lbt_counter for recording the number of continuous LBT failure indications received by the UE from the physical layer.

For each serving cell configured with LBT failure recovery related parameters, the MAC entity performs the LBT failure recovery procedure as follows: if the LBT failure indication from the physical layer is received, starting an LBT failure monitoring timer, adding 1 to the LBT_COUNTER, and judging whether the value of the LBT_COUNTER is larger than or equal to the maximum number LBT-FailureInstanceMaxCount of LBT failure examples. If the value of LBT_COUNTER is greater than or equal to the maximum number of LBT failure instances LBT-FailurenstanceMaxCount, consecutive LBT failures to the serving cell and to the currently active upstream BWP are triggered (consistent LBT failure). If the serving Cell is a special Cell (SpCell), the UE further determines whether all uplink BWP resources of the physical random access channel (Physical Random Access Channel, PRACH) are configured on the same uplink carrier of the Cell have been triggered by consecutive LBT failures. If all uplink BWP configured with PRACH resources on the same uplink carrier of the cell have been triggered to fail the continuous LBT, the MAC layer indicates the continuous LBT failure to an upper layer (RRC layer); otherwise, if the uplink BWP on the same uplink carrier of the cell, which is configured with PRACH resources, is not all triggered by the consecutive LBT failure, the UE stops the ongoing random access procedure on the cell and performs BWP change, changes the currently activated uplink BWP to another uplink BWP on the same carrier of the cell, which is configured with PRACH resources but has not been triggered by the consecutive LBT failure, and initiates the random access procedure on the new activated BWP. If all triggered consecutive LBT failures on the serving cell are cancelled (cancel), or the LBT failure monitoring timer expires, or the RRC layer reconfigures the LBT failure recovery related parameters, then the UE variable lbt_counter is reset to zero. After the random access procedure triggered on the SpCell is successfully completed, the UE cancels all the triggered consecutive LBT failures on the SpCell.

Successful handover report:

handover information reporting upon successful handover is standardized in the NR system of release 17. The handover information report during successful handover is also referred to as a successful handover report (Successful Handover Report, SHR) for providing mobility information related to a handover procedure successfully performed to the network side, so that the network side further optimizes the configuration of mobility parameters based on the information reported by the UEs, and improves handover performance, such as reducing handover delay. For successful handover information reporting content, one or more of the following may be included: the UE radio network temporary identity C-RNTI, source cell identity, target cell identity, measurements of source or target cells, neighbor cell measurements, cause indicating that a successful handover information report was triggered (i.e., which trigger condition was met), random access procedure information, location information, etc. The handover success includes an RRC reconfiguration complete message for responding to a handover command RRC reconfiguration message to the target base station to be successfully transmitted or the MAC layer to successfully complete a random access procedure to the target base station. The network side UE configures information for triggering a successful handover report (e.g., threshold values corresponding to T310, T312, and T304, and the source cell experiences a radio link failure RLF during the execution of a dual active protocol stack (Dual Active Protocol Stack, DAPS) handover), which is called SHR configuration. Only if one or more trigger conditions according to the configured trigger information are met (for example, when a handover command is received or when a percentage of an operation value of T310 (or T312) of a source cell and a configuration value of T310 (or T312) exceeds a configured corresponding threshold value, a percentage of an operation value of T304 and a configuration value of T304 when a handover is successfully completed exceeds a configured corresponding threshold value, and the source cell generates RLF during the execution of DAPS handover (when a timer T304 is running), the UE records handover information of the successful handover in a UE variable (for example, varsuccess ho-Report) corresponding to SHR. Wherein a trigger condition associated with the source cell, such as a T310 threshold or a T312 threshold, is configured by the source cell to the UE, a trigger condition associated with the target cell, such as a T304 threshold, is configured by the target cell to the UE, and the configuration of the successful handover report trigger information is included in the successful handover report configuration (such as a success ho-config information element). The UE may inform the network side of the successful handover report (as indicated by the success ho-InfoAvailable information element) available on it through an RRC message. After receiving the indication, the network side may request the UE to report the saved successful handover information report through an RRC message (e.g., a subccessho-ReportReq indication in the ueinfomation request message). The UE will Report the saved successful handover Report (success ho-Report) in the ueinfo response message to the network side in a response RRC message. The successful handover report stored on the UE may be stored for a maximum of 48 hours.

The SHR mechanism in release 17 takes into account traditional handover, conditional handover, and DAPS handover scenarios, but due to time constraints, the mobility optimization mechanism in NR-U scenarios is not enhanced. As previously mentioned, this will serve as one of the objectives of the release 18 study. In the NR-U network, the triggering and reporting mechanism of the existing SHR is insufficient in the NR-U network due to the specificity (e.g. using LBT function) in the NR-U network, so how to trigger the UE to record the SHR in the NR-U network and how to report the SHR to the network side becomes a problem to be solved. These problems are also addressed by the present disclosure.

The embodiments described below provide solutions to the above problems, and embodiments are not mutually exclusive, embodiments may be combined, or some concepts or definitions may be used between embodiments unless specifically stated.

Example 1

This embodiment presents a method of configuration, triggering and setting of handover information reporting performed on a UE. According to the method, the UE receives the SHR configuration including the trigger information which is set to be continuous LBT failure from the network side, so that the UE can trigger the UE to record the switching information SHR of the switching event based on the trigger information of the configuration after the switching process is successful, and the switching information SHR is reported to the network to adjust and optimize the switching parameters.

Hereinafter, embodiment 1 of the present disclosure will be described in detail. Fig. 1 is a schematic flowchart showing a handover information reporting method in embodiment 1 of the present disclosure, and as shown in fig. 1, the handover information reporting method in embodiment 1 of the present disclosure may include the following steps.

Step 101: the UE receives SHR configuration containing first trigger information from a network side.

In one implementation 1, the first trigger information is set to true, which is used to indicate that if the UE triggers a continuous LBT failure for at least one uplink BWP of the target cell during the handover procedure (during operation of T304), the UE generates SHR when the handover procedure to the target cell is successfully completed.

In another implementation 2, the first trigger information is set to true, which is used to indicate that if the UE triggers a continuous LBT failure for all uplink BWP of the target cell during the handover procedure (during operation of T304), the UE generates SHR when the handover procedure to the target cell is successfully completed. In the prior art, when consecutive LBT failures are triggered on all uplink BWP of the serving cell, the MAC layer of the UE indicates one consecutive LBT failure to the RRC layer. In this implementation, therefore, the first trigger information is used to instruct the UE to determine whether the continuous LBT failure indication for the target cell is received in the handover procedure, and if so, the UE generates the SHR when the handover procedure to the target cell is successfully completed.

In yet another implementation 3, the first trigger information is set to an integer (denoted herein as N) to indicate that if the number of uplink BWP's that fail consecutive LBTs triggered by the UE during the handover procedure (during operation of T304) to the target cell is greater than or equal to N, the UE generates SHR when the handover procedure to the target cell is successfully completed.

In either implementation 1 or implementation 3, the RRC layer of the UE learns from the MAC layer that one or more uplink BWP to the target cell triggered consecutive LBT failures. This is not supported in existing mechanisms, so this requires the MAC layer to inform the RRC layer of the failure whenever an active upstream BWP to the target cell triggers a consecutive LBT failure.

Preferably, the uplink BWP refers to an uplink BWP configured with PRACH resources.

Preferably, the first trigger information is configured by a target cell of a handover procedure.

The SHR configuration includes a configuration for indicating the UE to report the successful handover information to the network side, as described above. In the NR system, the identification is made by the success HO-Config information element, and the identification is contained in the other-Config information element in the RRC message. Preferably, the RRC message is an RRC reconfiguration message.

When the UE receives the RRC message containing the SHR configuration, the UE applies the SHR configuration and considers it configured with the SHR configuration.

Step 102: when the UE successfully completes the handover procedure to the target cell, the UE performs an operation for the SHR determination procedure. The operations for the SHR determination procedure may include: judging whether the trigger condition is satisfied or not based on the trigger information in the SHR configuration, and storing the SHR and setting the content in the corresponding SHR when the trigger condition is satisfied.

In combination with the first trigger information in step 101, performing an operation for the SHR determination procedure may include: for the first trigger information in implementation 1, if the UE triggers a continuous LBT failure for at least one uplink BWP of the target cell during the handover process (during operation of T304), saving successful handover information of the handover event in the UE variable for SHR; for the first trigger information in implementation 2, if the UE triggers a continuous LBT failure for all uplink BWP of the target cell in the handover process (during operation of T304), saving successful handover information of the handover event in the UE variable for SHR; for the first trigger information in implementation 3, if the number of uplink BWP in the UE triggering continuous LBT failure in the handover process (during operation of T304) to the target cell is greater than or equal to N, the successful handover information of the handover event is stored in the UE variable for SHR.

Preferably, performing the operation for the SHR determination procedure may further include setting one or more of the following first to fourth SHR information in the SHR: if the first trigger information in the SHR configuration is configured and the condition of the above SHR determining process based on the first trigger information is satisfied, the first SHR information in the trigger cause of the SHR (i.e., SHR-cause information element) is set to true. The first SHR information is used for indicating that the triggering reason of the SHR is that a condition based on the first triggering information is met. The condition based on the first trigger information is met, for implementation 1, the first trigger information refers to that the UE triggers a continuous LBT failure for at least one uplink BWP of the target cell in the handover process (during operation of T304); the first trigger information in implementation 2 refers to that the UE triggers a continuous LBT failure for all uplink BWP of the target cell during the handover process (during operation of T304); the first trigger information in implementation 3 refers to that the number of uplink BWP in the UE triggering continuous LBT failure in the handover process (during operation of T304) to the target cell is greater than or equal to N. The second SHR information includes a measurement result for reference signal strength indicator RSSI when the handover is successfully completed. Third SHR information indicating an identification of one or more uplink BWP in the handover procedure that triggered consecutive LBT failures for the target cell. Fourth SHR information including LBT failure recovery configuration parameters.

Preferably, the SHR configuration is further described as the SHR configuration before performing the handover procedure, i.e. the most recent synchronization reconfiguration (received or applied).

Preferably, the successful completion of the random access procedure triggered by the handover procedure of the MCG is completed successfully by the handover finger to the target cell.

It is obvious that between step 101 and step 102, the UE also receives a handover command from the network and performs a handover procedure; or the UE performs a conditional reconfiguration (Conditional Reconfiguration) evaluation procedure, when the trigger condition of the conditional reconfiguration is met (i.e. a trigger cell is determined in the conditional reconfiguration evaluation procedure), a handover procedure based on the conditional reconfiguration is performed.

Example 2

This embodiment presents another method of configuration, triggering and setting up handover information reporting performed on a UE. According to the method, the UE receives SHR configuration containing trigger information set as a T304 threshold value from the network side, so that the UE can trigger the UE to record switching information SHR of the switching event based on the trigger information of the configuration after the switching process is successful, and the switching information SHR is reported to the network to adjust and optimize switching parameters. Unlike embodiment 1, new SHR trigger information is defined in embodiment 1, while existing SHR trigger information in existing mechanisms is used in this embodiment 2 to trigger the UE to record SHR containing NR-U specific parameters.

Hereinafter, embodiment 2 of the present disclosure will be described in detail. Fig. 2 is a schematic flowchart showing a handover information reporting method in embodiment 2 of the present disclosure, and as shown in fig. 2, the handover information reporting method in embodiment 2 of the present disclosure may include the following steps.

Step 201: the UE receives from the network side a SHR configuration containing a timer T304 percentage threshold value threshold manager T304 information element. The T304 percentage threshold value is used to indicate a threshold of percentage between the running value of T304 and the configuration value of T304.

Step 202: when the UE successfully completes the handover procedure to the target cell, the UE performs an operation for the SHR determination procedure. The operations for the SHR determination procedure may include: if the percentage of the running value of T304 and the configuration value of T304 at the successful completion of the handover exceeds the configured corresponding threshold value, the UE saves the NR-U specific information for the handover event in the UE variable for SHR. Preferably, the NR-U specific information may be one or more of the following information: second SHR information: LBT-related measurements; third SHR information: the identification of one or more uplink BWPs which trigger continuous LBT failure to a target cell in the switching process; fourth SHR information: recovering relevant configuration parameters by LBT failure; fifth SHR information: at least one uplink BWP of the target cell triggers an indication of continuous LBT failure in the switching process; sixth SHR information: triggering continuous LBT failure indication to all uplink BWP of a target cell in the switching process; seventh SHR information: RSSI measurement configuration (e.g., measRSSI-ReportConfig information element), etc. The LBT-related measurement or statistic may be a measurement of a reference signal strength indication (Reference Signal Strength Indicator, RSSI) measurement or a channel duty cycle (channel occupancy) measurement, or the like, that was most recently obtained to perform the LBT-related measurement when the handover was successful.

It is obvious that between step 201 and step 202, the UE also receives a handover command from the network and performs a handover procedure; or the UE performs a conditional reconfiguration (Conditional Reconfiguration) evaluation procedure, when the trigger condition of the conditional reconfiguration is met (i.e. a trigger cell is determined in the conditional reconfiguration evaluation procedure), a handover procedure based on the conditional reconfiguration is performed.

Example 3

This embodiment presents a handover information reporting method performed on a UE. By the method in this embodiment, the UE may report the relevant information in the foregoing embodiment to the base station in a successful handover report, so as to provide more accurate handover information to the network side. This embodiment shows a method when the UE reports the handover information report described in embodiments 1 to 2 through an RRC procedure.

Hereinafter, embodiment 3 of the present disclosure will be described in detail. Fig. 3 is a schematic flowchart showing a handover information reporting method in embodiment 3 of the present disclosure, and as shown in fig. 3, the handover information reporting method in embodiment 3 of the present disclosure may include the following steps.

Step 301: the UE receives a ueinfo request message from the network side, where the UE carries an indication/request (e.g. a success ho-ReportReq information element set to true) for requesting the UE to report the saved successful handover report.

Step 302: the UE includes the content in the saved successful handover Report in a UEInformationResponse message (a success HO-Report information element therein) and sends the UEInformationResponse message to the network side. The successful handover report included in the RRC message includes one or more of the first SHR information in the foregoing embodiment 1 or the NR-U specific information in embodiment 2.

Example 4

This embodiment illustrates the user equipment UE of the present disclosure. Fig. 4 is a block diagram showing a user equipment UE to which the present disclosure relates. As shown in fig. 4, the user equipment UE40 comprises a processor 401 and a memory 402. The processor 401 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like. The memory 402 may include, for example, volatile memory (such as random access memory RAM), a Hard Disk Drive (HDD), non-volatile memory (such as flash memory), or other memory. The memory 402 has stored thereon program instructions. Which, when executed by the processor 401, may perform the handover information reporting method described in detail in the present invention.

The method of the present disclosure and the apparatus involved have been described above in connection with the preferred embodiments. Those skilled in the art will appreciate that the methods shown above are merely exemplary. The methods of the present disclosure are not limited to the steps and sequences shown above. The base stations and user equipments shown above may comprise further modules, e.g. may also comprise modules that may be developed or developed in the future that may be used for base stations, MMEs, or UEs, etc. The various identifiers shown above are merely exemplary and are not limiting, and the present disclosure is not limited to specific cells as examples of such identifiers. Many variations and modifications may be made by one of ordinary skill in the art in light of the teachings of the illustrated embodiments.

The program running on the apparatus according to the present disclosure may be a program for causing a computer to realize 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 store such as a random access memory RAM, a Hard Disk Drive (HDD), a nonvolatile store such as a flash memory, or other memory system.

A program for realizing the functions of the embodiments of the present disclosure may be recorded on a computer-readable recording medium. The corresponding functions can be realized by causing a computer system to read programs recorded on the recording medium and execute the programs. The term "computer system" as used herein may be a computer system embedded in the device and may include an operating system or hardware (e.g., peripheral devices). The "computer-readable recording medium" may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium in which a program is stored dynamically at a short time, or any other recording medium readable by a computer.

The various features or functional modules of the apparatus used in the embodiments described above may be implemented or performed by circuitry (e.g., single-chip or multi-chip integrated circuits). Circuits designed to perform the functions described herein 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 device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The circuit may be a digital circuit or an analog circuit. Where new integrated circuit technologies are presented as an alternative to 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.

Further, 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 may be used as terminal devices or communication devices such as AV devices, kitchen devices, cleaning devices, air conditioners, office devices, vending machines, and other home appliances, etc.

As 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-described embodiments, and the present disclosure also includes any design modifications without departing from the gist 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 the different embodiments are also included in the technical scope of the present disclosure. Further, the components having the same effects described in the above embodiments may be replaced with each other.

Claims

1. A handover information reporting method, comprising:

the User Equipment (UE) receives a Successful Handover Report (SHR) configuration containing first trigger information from a network side;

when the UE successfully completes the switching process to the target cell, the UE executes an operation for the SHR determining process;

wherein, the first trigger information is used for indicating: if the UE fails to listen before continuously transmitting LBT triggered at least one upstream bandwidth portion BWP of the target cell during the handover procedure during the running of the timer T304, the UE generates SHR when the handover procedure to the target cell is successfully completed.

2. The handover information reporting method according to claim 1, wherein,

the first trigger information is set to true, and is used for indicating: if the UE triggers a consecutive LBT failure for all uplink BWP of the target cell during the handover procedure during the T304 operation, the UE generates SHR when the handover procedure to the target cell is successfully completed.

3. The handover information reporting method according to claim 1, wherein,

the first trigger information further includes an integer N for indicating: if the number of uplink BWP to the target cell that trigger consecutive LBT failure in the handover procedure during T304 operation is greater than or equal to N, the UE generates SHR when the handover procedure to the target cell is successfully completed.

4. The handover information reporting method according to claim 1, 2, or 3, wherein,

the first trigger information is configured by a target cell of a handover process;

the uplink BWP is an uplink BWP configured with physical random access channel PRACH resources.

5. The handover information reporting method according to claim 1, 2, or 3, wherein,

the operations for the SHR determination process include: judging whether the trigger condition is met or not based on the trigger information in the SHR configuration, and storing the SHR and setting the content in the corresponding SHR when the trigger condition is met.

6. The handover information reporting method according to claim 5, wherein,

the SHR successful handover information includes at least one of the following information:

the method comprises the steps of first SHR information, wherein the trigger reason of the SHR information is that at least one uplink BWP of a target cell triggers continuous LBT failure in a switching process; or (b)

The method comprises the steps of first SHR information, wherein the trigger reason of the SHR information is that all uplink BWPs of a target cell trigger continuous LBT failure in a switching process; or (b)

The method comprises the steps of first SHR information, wherein the trigger reason of the SHR information is that the number of uplink BWPs triggering continuous LBT failure of a target cell is greater than or equal to N;

the second SHR information comprises a measurement result for indicating RSSI by reference signal strength when the switching is successfully completed;

third SHR information indicating an identification of one or more uplink BWP in the handover process that triggered a continuous LBT failure for the target cell;

fourth SHR information including LBT failure recovery configuration parameters.

7. The handover information reporting method according to claim 1, 2, or 3, wherein,

the handover information reporting method further includes:

the UE receives a UEInformationRequest message from a network side, wherein the UEInformationRequest message carries an instruction/request for requesting the UE to report the stored SHR; and

and the UE includes the content in the stored SHR in a UEInformationresponse message and sends the UEInformationresponse message to the network side.

8. A handover information reporting method, comprising:

the User Equipment (UE) receives a Successful Handover Report (SHR) configuration containing a timer T304 percentage threshold value from a network side;

when the UE successfully completes a handover procedure to a target cell, the UE performs operations for a SHR determination procedure, including;

if the percentage of the running value of T304 and the configuration value of T304 exceeds the configured corresponding threshold value when the switching is successfully completed, the NR-U specific information of the switching event is stored in the SHR.

9. The handover information reporting method according to claim 8, wherein,

the NR-U specific information contained in the SHR at least comprises one or more of the following information:

fourth SHR information including LBT failure recovery configuration parameters;

fifth SHR information indicating that at least one uplink BWP to the target cell triggers an indication of consecutive LBT failure in the handover procedure;

sixth SHR information indicating that all uplink BWP to the target cell trigger an indication of consecutive LBT failure during handover.

10. A user equipment, comprising:

a processor; and

a memory having instructions stored thereon;

wherein the instructions, when executed by the processor, cause the user equipment to perform the handover information reporting method according to any one of claims 1-9.