CN117395732A

CN117395732A - Handover information reporting method and user equipment

Info

Publication number: CN117395732A
Application number: CN202210785554.1A
Authority: CN
Inventors: 常宁娟; 刘仁茂
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2022-07-04
Filing date: 2022-07-04
Publication date: 2024-01-12
Also published as: WO2024008076A1

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 is in a radio link failure RLF state when receiving a switching command or initiating switching, the UE generates SHR when the switching process 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#94 e, 12, month 2021 (see non-patent literature: RP-213553:New WID on further enhancement of data collection ior 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 therein is to implement a mobility performance optimization mechanism under a fast master cell group (Master Cell Group, MCG) recovery mechanism.

The present disclosure proposes a solution to the problem of how to implement handover information reporting under a fast MCG recovery 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 a fast MCG recovery mechanism in NR systems. More specifically, the present disclosure addresses how to record its corresponding handover information in a handover information report for a handover event when a fast MCG recovery procedure is performed in an NR system. 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 is in a radio link failure RLF state when receiving a switching command or initiating switching, the UE generates SHR when the switching process to the target cell is successfully completed.

In the handover information reporting method of the first aspect, preferably, the first trigger information may be represented by a sourceRLF-reporting information element or a MCGRLF-reporting information element.

In the handover information reporting method of the first aspect, preferably, the first trigger information may be configured by a source cell of a handover procedure.

In the handover information reporting method of the first aspect, preferably, the operation for the SHR determination procedure may 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.

In the handover information reporting method of the first aspect, preferably, the operation for the SHR determination procedure may include: if the first trigger information in the SHR configuration is set to true and the source MCG link is in RLF state when a handover command is received or a handover procedure is initiated, saving successful handover information of the handover event in a UE variable for SHR.

In the handover information reporting method of the first aspect, preferably, the SHR may include at least one of the following information: first SHR information for indicating that a trigger cause of the SHR is that an MCG link is in RLF; second SHR information indicating a cause of MCG RLF occurrence; third SHR information indicating a measurement result of the source cell when RLF occurs last time; fourth SHR information indicating a measurement result of a neighbor cell when RLF occurs last time.

In the handover information reporting method of the first aspect, preferably, the handover information reporting method may further include: the UE receives UEInformationReq uest information from a network side, wherein the UEInformationRequest information 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 UEInformationRe sponse 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 successfully completes the switching process to the target cell; if the UE judges that the source MCG link is in a radio link failure RLF state when receiving a switching command or initiating a switching process, the UE stores successful switching information corresponding to the associated switching event in a UE variable for successful switching report SHR and sets content in the corresponding SHR.

In the handover information reporting method of the above second aspect, preferably, the SHR may include at least one of the following information: first SHR information for indicating that a trigger cause of the SHR is that an MCG link is in RLF; second SHR information indicating a cause of MCG RLF occurrence; third SHR information indicating a measurement result of the source cell when RLF occurs last time; fourth SHR information indicating a measurement result of a neighbor cell when RLF occurs last time.

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 schematic flowchart showing a handover information reporting method in embodiment 4 of the present disclosure.

Fig. 5 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, it should be noted that the present disclosure is not limited to the following embodiments, but is applicable to still other wireless communication systems. Unless specifically stated otherwise, in the present disclosure, concepts of cells and base stations 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. In the present disclosure, handover refers to a change of a primary cell initiated by a network side, including a primary cell change between cells, and also including a primary cell change in a cell, that is, a primary cell of a UE changes from a source cell to a target cell, where the source cell and the target cell may be the same cell or different cells, and in this process, a secret key or a security algorithm for access layer security may be updated or not updated accordingly. The security includes encryption and decryption and integrity protection. 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 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 RRC reestablishment message is identical to the RRC connection reestablishment message; similarly, the response message RRC reestablishment complete message is identical to the RRC connection reestablishment complete message.

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 (SpCell) 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.

Double connection (Dual Connectivity):

in order to improve the data transmission efficiency of the UE, the UE establishes links with two base stations at the same time, i.e. the radio resources used by the UE are provided by different schedulers located at the two base stations. The radio access between the two base stations and the UE may be of the same or different formats (Radio Access Technology, RAT), such as both NR, or one NR and one LTE also known as evolved universal terrestrial radio access (Evolved Universal Terrestrial Radio Access, E-UTRA). Of these two base stations, one is called Master Node (MN) or MgNB, meNB, and the serving cell group under the Master base station is called Master cell group (Master Cell Group, MCG); the other is called Secondary Node (SN) or SgNB, seNB, and the group of serving cells under the Secondary base station is called Secondary cell group (Secondary Cell Group, SCG). When the primary base station is LTE and the secondary base station is NR, DC is referred to as EN-DC (using a 4G core network) or NGEN-DC (using a 5G core network); DC when both the primary and secondary base stations are NR is referred to as NR-DC. The MCG includes a Primary Cell (PCell) and optionally one or more Secondary cells (scells). The PCell operates on a primary frequency, and the UE performs an initial connection establishment procedure or a connection re-establishment procedure through the primary frequency. The SCG comprises one PSCell and optionally one or more scells. PSCell refers to an SCG cell in which a UE performs random access when performing a synchronization reconfiguration procedure or an SCG addition procedure. PCell and PSCell are also collectively referred to as a special cell SpCell. When DC is configured, DRBs and SRBs supporting the UE are configured as split bearers (split bearers). Split SRB supports transmission over both MCG and SCG paths. Copies of the RRC protocol data units (Protocol Data Unit, PDUs) may also be transferred over the MCG and SCG paths when a copy (duplication) transmission mechanism is applied to improve the rate or reliability of the transmission. Split bearers may be for the uplink or for the downlink. Support is configured as split SRB for SRB1 and SRB 2. For downstream, the network side may decide which path to select to send data according to some criteria, such as channel quality. For uplink, the UE determines whether to use the MCG path or transmit on both paths according to the RRC signaling configuration at the network side. When not configured as split SRBs, SRB1 and SRB2 are transported over the MCG path. In addition, when DC is configured, SRB3 may also be established for SN, mainly for transmitting configuration associated with SCG between SN and UE, etc. Both the establishment and release of SRB3 are determined by SN, and the configuration of split SRB for SRB3 is not supported. The UE may configure split SRB1 and SRB3 simultaneously.

Fast MCG link recovery mechanism:

release 16 dual link and carrier aggregation enhancement project (see document RP-190452) introduces a fast MCG link recovery mechanism. In the fast MCG link recovery mechanism, when the MCG of the UE fails in radio link (Radio Link Failure, RLF) or the UE fails in performing a HandOver procedure (HandOver Failure, HOF) (i.e., T304 of the MCG times out), if the UE is configured with T316 (i.e., fast MCG link recovery is enabled) and the secondary cell group SCG link quality is good (i.e., RLF does not occur, timer T310 is not running or is not in a PSCell addition change procedure (i.e., T04 corresponding to PSCell is not running), or the SCG is not in a suspended state (non suspended), or the SCG is not in a deactivated state), at this time, neither the MCG nor the SCG is in a suspended (or suspended) state, or timer T316 is not running, the UE initiates an MCG Failure information flow, starts timer T316, and sends a g Failure information (mcgfluai) containing information of MCG Failure reporting the MCG link Failure to the RRC base station through a SCG path (e.g_srb 1 or SRB 3) to trigger the RRC connection reestablishment procedure directly. In the MCG failure information procedure, the UE suspends transmission of the MCG path, such as suspending transmission of the MCG side corresponding to all SRBs and DRBs except SRB0, and resets the MAC entity corresponding to the MCG, and waits for a response from the network side during the operation of the timer T316. The master base station that receives the MCG failure information RRC message may send an RRC reconfiguration message including a synchronization reconfiguration information element to the UE to trigger the UE to switch to a new cell or send an RRC release message to release the RRC connection of the UE. After receiving the RRC reconfiguration message or the RRC release message, the UE stops T316, and executes corresponding operations according to the received response message (RRC reconfiguration message or RRC release message). If T316 times out, the UE initiates an RRC reestablishment procedure. This fast MCG link recovery mechanism/procedure may be applied in situations where MR-DC (Multi-Radio access technology Dual Connectivity) is configured, such as NE-DC (NR E-UTRA Dual Connectivity), EN-DC (E-UTRA NR Dual Connectivity), NR DC (New Radio Dual Connectivity), NGEN-DC (Next Generation-radio access network E-UTRA NR Dual Connectivity), LTE DC (intra-E-UTRAN DC), and the like. In this disclosure, the MCG failure information procedure/mechanism and the fast MCG recovery procedure/mechanism are equivalent.

Successful handover report:

as previously mentioned, one of the purposes in the new study of release 17 is to introduce a handover information report at the time of a successful handover. The handover information report at the time of successful handover is also simply referred to as a successful handover report (Successful Handover Report, SHR). This is because performing network optimization in NR systems solely by radio link failure RLF reporting in existing mechanisms may make the data collection procedure lengthy, whereas handover information reporting allows the network side to obtain a sufficient number of samples in the mobility procedure faster when the handover is successful. Second, even for successful handover scenarios, there is room for further optimization of its mobility parameters. 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 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 can request the UE to report the saved successful handover information report through an RRC message (such as a success HO-ReportReq indication in a UEInformationRequest 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.

In the scenario where no DC is configured, the handover procedure is successful means that the link of the primary cell can successfully receive the handover command. Even if the link state of the master base station is not good at this time (e.g., the timer T310 or T312 for link failure monitoring is already in an operating state when a handover command is received), it is in a state where at least the handover command can be successfully received. In the MCG failure information process, after the MCG fails, an MCGFailureinformation message is sent to the master base station through the SCG link, and then a handover command from the master base station is received through the SCG link (split SRB1 or SRB 3). Because the handover command is received from the SCG link, even if the UE successfully receives the handover command, it does not mean that the link state of the primary cell is in a state where the command can be successfully received. Under the fast MCG link recovery mechanism, the UE starts a timer T316 to wait for a handover command at the network side after RLF of the MCG link occurs. Assuming that the switch command is received when the operation time of T316 reaches T, this means that the switch command is received after the MCG link fails for T time. And under normal conditions, the handover command should be issued to the UE before the MCG RLF occurs, so as to avoid data interruption due to the MCG RLF. The existing successful handover report makes the base station unable to learn that the handover occurs in the above scenario after receiving the successful handover report, which may bring inaccuracy to adjustment and optimization of handover parameters. The above-described problems become the problems 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 SHR configuration containing a trigger information set as RLF 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.

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. Preferably, the first trigger information is set to true, which is used to indicate that if the UE is in an RLF state when receiving a handover command or initiating handover, the UE generates SHR when the handover procedure to the target cell is successfully completed. Preferably, the first trigger information is represented by a sourceRLF-reporting information element or a MCGRLF-reporting information element.

Preferably, the first trigger information is configured by a source cell of a handover procedure. Optionally, 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, and in the NR system, the configuration is identified by a success ho-Config information element, and is included in an other-Config information element in the RRC message. Preferably, the RRC message is an RRC reconfiguration message.

In the fast MCG recovery mechanism, when the UE receives the handover command, the MCG link is in RLF state also equates to the UE receiving the handover command when timer T316 is running. Therefore, in the above step 101, it may also be expressed that the first trigger information is set to true to indicate that if the UE is in the running state when receiving the handover command or initiating the handover, the UE generates SHR when the handover procedure to the target cell is successfully completed.

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: if the first trigger information in the SHR configuration is set to true and the source MCG/PCell is in RLF state when a handover command is received or a handover procedure is initiated, the successful handover information for the handover event is saved in the UE variable for SHR.

Preferably, performing the operation for the SHR determination procedure may further include: if the first trigger information in the SHR configuration is set to true and the source MCG/PCell is in RLF state when a handover command is received or a handover procedure is initiated, 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 the MCG/PCell is in RLF; or including second SHR information in the SHR, the second SHR information indicating a cause of MCG RLF occurrence. Optionally, the RLF reasons are random access problem, T310 timeout, T312 timeout, RLC reaching maximum number of retransmissions, etc.

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.

Corresponding to the expression in step 101 in the fast MCG recovery mechanism, the operations performed in step 102 for the SHR determination procedure include: if the first trigger information in the SHR configuration is set to true and T316 is in an operational state when a handover command is received or a handover procedure is initiated, the successful handover information for the handover event is saved in the UE variable for SHR. Preferably, performing the operation for the SHR determination procedure further comprises: if the first trigger information in the SHR configuration is set to true and T316 is in an operating state when a handover command is received or a handover procedure is initiated, the first SHR information in the trigger cause of the SHR (i.e., the SHR-cause information element) is set to true. The first SHR information is used to indicate that the trigger reason for the SHR is that T316 is running (i.e., the UE is performing a fast MCG recovery procedure); or including second SHR information in the SHR, the second SHR information indicating a cause of MCG RLF occurrence. Optionally, the RLF reasons are random access problem, T310 timeout, T312 timeout, RLC reaching maximum number of retransmissions, etc.

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 a triggering method for handover information reporting performed on a UE. By the method in this embodiment, after the handover procedure is successful, the UE may determine whether to trigger the UE to record the handover information SHR of the handover event based on whether the current MCG is in the RLF state, so as to report the handover information SHR to the network for adjustment and optimization of the handover parameters.

Unlike step 101 where the UE needs to receive trigger information in SHR configuration from the network side, in this embodiment, when the UE successfully completes the handover procedure to the target cell, if the UE determines that the source MCG/PCell is in RLF state when receiving the handover command or initiating the handover procedure, the UE always saves the successful handover information corresponding to the associated handover event in the UE variable for SHR and sets the content in the corresponding SHR.

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 successfully completes the handover procedure to the target cell.

Step 202: if the UE judges that the source MCG link is in the RLF state when receiving a switching command or initiating a switching process, the UE stores successful switching information corresponding to the associated switching event in a UE variable for SHR and sets content in the corresponding SHR.

In the fast MCG recovery mechanism, this embodiment may also be expressed as that when the UE successfully completes the handover procedure to the target cell, if the UE determines that T316 is running when a handover command is received or a handover procedure is initiated (i.e., the UE is performing the fast MCG recovery procedure), the UE always saves the successful handover information corresponding to the associated handover event in the UE variable for SHR and sets the content in the corresponding SHR.

The SHR may include one or more of the following as described above: 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 content in the SHR may also include the first to second SHR information described in embodiment 1. The content in the SHR is not limited in this embodiment.

Obviously, this embodiment also includes that the UE 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, when the handover command is successfully received through the SCG path, the UE may report the relevant information to the base station in a successful handover report, so as to provide more accurate handover information to the network side. The base station can adjust and optimize the switching parameters according to the related information that the UE in the successful switching report executes the fast MCG link recovery process.

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.

In step 301, the UE receives a handover command from the network side and performs handover.

In step 302, the UE saves successful handover information of the successful handover in a successful handover report variable, wherein the successful handover information includes one or more of the following:

third SHR information indicating a measurement result of the source cell when RLF occurs last time;

fourth SHR information, measurement result of neighbor cell when RLF occurs last time.

This embodiment does not limit the UE to determine the trigger of recording SHR, but only focuses on the UE to record the above SHR information in SHR, so the method of triggering SHR recording by the UE described in embodiment 1 or embodiment 2 can be combined with this embodiment.

Example 4

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 reports described in embodiments 1 to 3 through an RRC procedure.

Hereinafter, embodiment 4 of the present disclosure will be described in detail. Fig. 4 is a schematic flowchart showing a handover information reporting method in embodiment 4 of the present disclosure, and as shown in fig. 4, the handover information reporting method in embodiment 4 of the present disclosure may include the following steps.

Step 401: 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 402: 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 to the fourth SHR information in the foregoing embodiments.

Example 5

This embodiment illustrates the user equipment UE of the present disclosure. Fig. 5 is a block diagram showing a user equipment UE to which the present disclosure relates. As shown in fig. 5, the user equipment UE50 comprises a processor 501 and a memory 502. The processor 501 may include, for example, a microprocessor, microcontroller, embedded processor, or the like. The memory 502 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 502 has stored thereon program instructions. Which, when executed by the processor 501, 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 is in a radio link failure RLF state when receiving a switching command or initiating switching, the UE generates SHR when the switching process to the target cell is successfully completed.

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

the first trigger information is represented by a sourceRLF-reporting information element or an MCGRLF-reporting information element.

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

the first trigger information is configured by a source cell of a handover procedure.

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

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

the operations for the SHR determination procedure include: if the first trigger information in the SHR configuration is set to true and the source MCG link is in RLF state when a handover command is received or a handover procedure is initiated, saving successful handover information of the handover event in a UE variable for SHR.

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

the SHR contains at least one of the following information:

first SHR information for indicating that a trigger cause of the SHR is that an MCG link is in RLF;

second SHR information indicating a cause of MCG RLF occurrence;

fourth SHR information indicating a measurement result of a neighbor cell when RLF occurs last time.

7. The handover information reporting method according to claim 1 or 2, 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 successfully completes the switching process to the target cell;

if the UE judges that the source MCG link is in a radio link failure RLF state when receiving a switching command or initiating a switching process, the UE stores successful switching information corresponding to the associated switching event in a UE variable for successful switching report SHR and sets content in the corresponding SHR.

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

the SHR contains at least one of the following information:

second SHR information indicating a cause of MCG RLF occurrence;

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.