CN115835318A

CN115835318A - Switching information reporting method and user equipment

Info

Publication number: CN115835318A
Application number: CN202111096244.0A
Authority: CN
Inventors: 常宁娟; 刘仁茂
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2023-03-21
Also published as: WO2023040955A1

Abstract

The disclosure provides a handover information reporting method and user equipment. The switching information reporting method comprises the following steps: user Equipment (UE) receives a switching command from a network side and executes switching based on the switching command; under the condition that the UE judges that at least one condition in trigger conditions for triggering a successful handover report is met, the UE saves the information of the successful handover in the successful handover report; if the handover command corresponding to the handover procedure is successfully received through an SCG link of a secondary cell group or the UE is configured with a dual connectivity DC, first information is included in the successful handover report, wherein the first information is used for indicating the state of the SCG link when the handover command is successfully received.

Description

Switching information reporting method and user equipment

Technical Field

The present disclosure relates to the field of wireless communication technologies, and in particular, to a handover information reporting method in a handover situation and a corresponding user equipment.

Background

A new research project of Release 17 technical standards was approved at 12.2019 on the third Generation Partnership project (3 rd Generation Partnership project:3 GPP) RAN #86 at the third Generation Congress (see non-patent document: RP-193255. The research goal of this project is to enhance the network data collection process in NR systems to better achieve the goal of self-organizing self-optimizing networks and minimizing drive tests. One of the specific techniques studied is to implement handover information reporting in a successful handover scenario.

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

Disclosure of Invention

An object of the disclosed embodiments is to propose a solution to the problem of how to implement handover information reporting in NR systems. More specifically, the present disclosure proposes a solution to the problem of how to record handover information when a UE is configured with Dual Connectivity (DC) in an NR system. The embodiment of the disclosure provides a method for reporting handover information performed in user equipment and corresponding user equipment.

According to a first aspect of the present disclosure, a handover information reporting method is provided, including: user Equipment (UE) receives a switching command from a network side and executes switching based on the switching command; under the condition that the UE judges that at least one condition in trigger conditions for triggering a successful handover report is met, the UE saves the information of the successful handover in the successful handover report; if the handover command corresponding to the handover procedure is successfully received through an SCG link of a secondary cell group or the UE is configured with a dual connectivity DC, first information is included in the successful handover report, wherein the first information is used for indicating the state of the SCG link when the handover command is successfully received.

In the aforementioned method for reporting handover information according to the first aspect, the successful handover report may further include second information, where the second information is used to indicate a latest measurement result of the SCG cell when the handover command is successfully received.

In the aforementioned method for reporting handover information according to the first aspect, if the handover command corresponding to the handover procedure is successfully received through the SCG link, the successful handover report may include third information, where the third information is used to indicate that the handover command is successfully received through the SCG link.

In the aforementioned method for reporting handover information according to the first aspect, the triggering condition may include: t310 exceeds the configured threshold, T312 exceeds the configured threshold, T304 exceeds the configured threshold, the random access resource used by the handover procedure is not the dedicated random access resource configured in the handover command, the UE is configured with DC, and the handover command corresponding to the handover procedure is successfully received through the SCG link.

In the aforementioned method for reporting handover information according to the first aspect, the SCG status may indicate whether the T310 corresponding to the SCG is running, a running value of the T310 corresponding to the SCG, whether the T310 corresponding to the SCG is timed out, and whether the SCG is in an SCG failure state or a suspend state.

In the handover information reporting method of the first aspect, when receiving, from the network side, a UEInformationRequest message including a successful handover report request indication, the UE may include the content in the saved successful handover report in the UEInformationResponse message, and send the UEInformationResponse message to the network side.

According to a second aspect of the present disclosure, a handover information reporting method is provided, including: user Equipment (UE) receives a switching command from a network side and executes switching based on the switching command; under the condition that the UE judges that at least one condition in trigger conditions for triggering a successful switching report is met, the UE saves the information of the successful switching in the successful switching report; if the handover command corresponding to the handover procedure is a response to the master cell group MCG failure information, the successful handover report includes fourth information, where the fourth information is used to indicate that the MCG is in a radio link failure RLF state when the handover command is successfully received.

In the above-mentioned handover information reporting method according to the second aspect, the successful handover report may further include fifth information, where the fifth information is used to indicate an operation value of T316 when the handover command is successfully received.

In the above-mentioned handover information reporting method of the second aspect, when the operation value of T316 when the handover command is received exceeds the threshold value of T316, sixth information may be further included in the successful handover report, where the sixth information is used to indicate that the operation value of T316 when the handover command is successfully received exceeds the threshold value of T316.

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

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 diagram showing a transmission path of a split bearer.

Fig. 2 is a flowchart illustrating a handover information reporting method in example 1 according to an embodiment of the present invention.

Fig. 3 is a flowchart showing a handover information reporting method in embodiment 2 as an example of the present invention.

Fig. 4 is a block diagram representing 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 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 disclosure.

In the present disclosure, the terms "include" and "comprise," as well as derivatives thereof, mean inclusion without limitation; the term "or" is inclusive, meaning and/or.

In this specification, the various embodiments described below which are used to describe the principles of the present disclosure are by way of illustration only and should not be construed in any way to limit 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 as defined by the claims and their equivalents. The following description includes various specific details to aid understanding, but such details are to be regarded as illustrative 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. Moreover, descriptions of well-known functions and constructions are omitted for clarity and conciseness. Moreover, throughout the drawings, the same reference numerals are used for similar functions and operations.

Hereinafter, a plurality of embodiments according to the present disclosure are described in detail, taking a Long Term Evolution (LTE)/NR mobile communication system and its subsequent Evolution as an example application environment. However, it is to be noted that the present disclosure is not limited to the following embodiments, but is applicable to more other wireless communication systems. Unless otherwise specified, the concepts of cell and base station may be interchanged in this disclosure; the LTE system is also used to refer to the LTE system of 5G and beyond (e.g. referred to as the LTE system, or the LTE system that can be connected to the 5G core network), and LTE may be replaced by Evolved Universal Terrestrial Radio Access (E-UTRA) or Evolved Universal Terrestrial Radio Access network E-UTRAN. In this disclosure, handover refers to a change of a primary cell initiated by a network side, where the change of the primary cell including inter-cell also includes a change of a primary cell in a cell, that is, a primary cell of a UE is changed 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 stratum security may be updated or not updated accordingly. The security includes encryption and decryption and integrity protection. The source Cell may also be called a source base station, or called a source beam (beam), a source Transmission point (TRP), a source Primary Cell (PCell), a source Cell Group (MCG); the target cell may also be referred to as a target base station, or target beam, target transmission point, target primary cell PCell, target cell group MCG. The source cell refers to a cell serving the UE, which is connected before the handover procedure is initiated, that is, a cell transmitting a Radio Resource Control (RRC) message including a handover command to the UE. The target cell refers to a cell serving the UE and connected to the UE after the handover procedure is successfully completed, a cell indicated by a target cell identifier included in the handover command, or a cell 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, is an RRC reconfiguration message including a synchronization reconfiguration (reconfiguration with sync) information element, and further, is an RRC reconfiguration message including a synchronization reconfiguration with sync information element for the master cell group MCG. At this time, the handover may also be referred to as a synchronous reconfiguration of the MCG. In the LTE system, the RRC connection reconfiguration message includes a mobility control information (mobility control info) information element. The synchronization reconfiguration information element or the mobility control information element may include configuration information of the target cell, such as 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 equivalent in this disclosure; similarly, the response message RRC reconfiguration complete message is equivalent to the RRC connection reconfiguration complete message. The handover command is equivalent to the RRC message containing the handover command, and refers to the RRC message or the configuration in the RRC message that triggers the UE to perform the handover. The handover configuration refers to all or part of the configuration in the handover command. Cancellation, release, deletion, cleanup, and the like may be substituted. Execution, use, and application are alternatives. Configuration and reconfiguration may be alternative. Monitoring (monitor) and detection (detect) may be replaced. The RRC reestablishment message is equal to the RRC connection reestablishment message; similarly, the response message RRC reestablishment complete message is equivalent 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 the NR system, the RRC reconfiguration message for the handover command carries the RRC configuration from the target base station, including but not limited to the following RRC configurations (see section 6.2.2 in 3GPP technical standard protocol 38.331):

-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 reporting configuration, measurement gap (gap) configuration, etc.

-a cell group configuration (cellGroupConfig information element) for configuring the master cell group or the secondary cell group. The method includes Radio Link Control (RLC) bearer configuration (RLC-bearer toaddmodlist information element and RLC-bearer toreselist information element) corresponding to a data Radio bearer/a signaling Radio bearer, medium Access Control (MAC) configuration (MAC-cell group pconfig information element), 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 (serving cell information element), radio Link failure related timer and constant configuration, radio Link Monitoring (RLM) configuration, special cell dedicated configuration, and the like. The reconfigurationwitthsync information element is similar to the mobile control information in the LTE system, and includes handover related information to realize mobility, which includes serving cell configuration public information, cell radio network temporary identity C-RNTI of the UE in the target cell, handover process monitoring timer T304 configuration, random access dedicated configuration for random access process to the target cell, and the like.

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

-a Radio Bearer configuration (radioconfiguration information element) for configuring a Service Data Application Protocol layer (SDAP) and a Packet Data Convergence Protocol layer (PDCP) of a Data Radio Bearer (DRB) and/or a Signalling Radio Bearer (SRB).

Master key update configuration (masterKeyupdate information element).

Handover procedure in NR system:

the mobility of the connected user is mainly achieved through a handover procedure, i.e. a procedure in which the UE in the RRC connected state changes a serving cell (primary cell). A general handover procedure comprises the following phases: stage 1: and (5) a measuring stage. And the UE measures the radio link corresponding to the serving cell or the adjacent cell 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. And (2) stage: and a switching preparation phase. The base station determines to trigger the switching for the UE according to the received measurement report and other factors such as base station load, and the source base station and the target base station acquire a switching command configured by the target base station through a switching preparation process. And (3) stage: and switching the execution phase. The source base station sends the 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 the 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 as failed.

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, that is, 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 Standards (RATs), such as NR, or one NR, and one LTE is also called Evolved Universal Terrestrial Radio Access (E-UTRA). One of the two base stations is called a Master Node (MN) or MgNB, meNB, and a Group of serving cells under the Master Node is called a Master Cell Group (MCG); the other is called a Secondary base Station (SN) or SgNB, seNB, and the serving Cell Group under the Secondary base station is called a Secondary Cell Group (SCG). When the primary base station is LTE and the secondary base station is NR, DC is called EN-DC (using 4G core network) or NGEN-DC (using 5G core network); DC when both the main base station and the secondary base station are NRs is called NR-DC. The MCG comprises one Primary Cell (PCell) and optionally one or more Secondary cells (scells). The PCell works on the main frequency, and the UE executes an initial connection establishment process or a connection reestablishment process through the main frequency. The SCG contains one PSCell and optionally one or more scells. The PSCell refers to an SCG cell in which the UE performs random access when performing a synchronization reconfiguration procedure or an SCG addition procedure. PCell and PSCell are also collectively referred to as special cell SpCell. When the DC is configured, DRB and SRB configuration for the UE are supported as split bearers (split bearers). Figure 1 shows a schematic diagram of a transmission path of a split bearer. As shown in fig. 1, split SRB supports transmission over both MCG and SCG paths. When a duplicate (duplicate) sending mechanism is applied, copies of RRC Protocol Data Units (PDUs) may also be transmitted on the MCG and SCG paths to improve the transmission rate or reliability. The Split bearer may be for the uplink or downlink path. Support for the configuration of SRB1 and SRB2 as split SRB. For downlink, the network side may decide which path to select for transmitting 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 RRC signaling configuration on the network side. When not configured as split SRB, SRB1 and SRB2 are transported over the MCG path. Furthermore, when the DC is configured, SRB3 may also be established for the SN for transmitting configurations associated with SCG between the SN and the UE, and the like. The establishment and release of SRB3 are both determined by SN, and the allocation of split SRB to SRB3 is not supported. The UE may configure split SRB1 and SRB3 simultaneously.

Fast MCG link recovery mechanism:

in release 15 and previous systems, after a Radio Link Failure (RLF) of a master cell group or a HandOver Failure (HOF) of the UE occurs (i.e., T304 times out), the UE initiates an RRC connection reestablishment procedure to reestablish/recover the connection with the network side. In the initiated RRC connection reestablishment procedure, the UE first performs a cell selection procedure to select a reestablishment cell, and sends an RRC connection reestablishment request message to the UE. And when the UE receives the response message as the RRC connection reestablishment message, the UE reestablishes the RRC connection according to the configuration in the RRC connection reestablishment message, feeds back the RRC connection reestablishment completion message to the base station, and successfully ends the RRC connection reestablishment process.

The dual link and carrier aggregation enhancement project of release 16 (see document RP-190452) introduces a fast MCG link recovery mechanism. The term "fast" is used in relation to the recovery of the link connection directly through the RRC connection re-establishment procedure. In the fast MCG link recovery mechanism, when an RLF occurs in an MCG of a UE, if the secondary cell group SCG link quality of the UE is good (that is, no RLF occurs, the timer T310 is not in operation or is not in a PSCell change process (that is, T04 corresponding to an SCG is not in operation), or the SCG is not in a suspended state (not suspended), at this time, neither the MCG nor the SCG is in a suspended (or interrupted) state or the timer T316 is not in an operating state, the UE initiates an MCG failure information flow, starts the timer T316, and sends an MCG failure information (MCGFailureInformation) message including an information report of MCG link failure to a master base station through an SCG path (such as split SRB1 or SRB 3), instead of directly triggering an RRC connection reestablishment process. In the MCG failure information flow, the UE may suspend the transmission on the MCG path, for example, suspend the transmission on the MCG side corresponding to all SRBs and DRBs except SRB0, and reset the MAC entity corresponding to the MCG, and wait for the response on the network side during the operation of the timer T316. The master base station receiving the MCG failure information RRC message may send an RRC reconfiguration message containing 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 performs a corresponding operation according to the received response message. This fast MCG link recovery mechanism/procedure may be applied to cases 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 so on. In the present disclosure, the MCG failure information procedure and the fast MCG link recovery procedure are equivalent.

Successful handover reporting:

as previously mentioned, one of the goals in the new study of release 17 was to introduce handover information reporting on successful handovers. The Handover information Report when the Handover is Successful is also referred to as a Successful Handover Report (SHR) for short. This is because performing network optimization solely by radio link failure RLF reporting in existing mechanisms in the NR system may make the data collection process lengthy, while handover information reporting when handover is successful enables the network side to obtain a sufficient number of samples in the mobility process more quickly. Second, even for successful handover scenarios, there is room for further optimization of mobility parameters. For the successful handover information report content, one or more of the following may be included: a source cell identity; a target cell identity; measurement results of a source cell or a target cell; neighbor cell measurement results; indicating the reason why a successful handover information report was triggered (i.e. which trigger condition was met); T310/T312 performance (indicating whether T310 and/or T312 exceed a configured threshold); a beam failure monitoring condition when a switching command is received; performing random access to a target base station with one or more beam identifications that are the best to downlink; running state/value of T304 timer when handover is successfully completed; and random access procedure information, etc. The successful switching comprises the successful sending of an RRC reconfiguration complete message used for responding to the switching command RRC reconfiguration message to the target base station or the successful completion of the random access process to the target base station by the MAC layer. The network side needs to configure a trigger condition (e.g. threshold values corresponding to T310, T312, and T304) for a successful handover report to the UE, and only when one or more configured trigger conditions are satisfied (e.g. when a handover command is received, an operation value of T310 or T312 of a source cell exceeds the configured corresponding threshold value, and an operation value of T304 when handover is successfully completed exceeds the configured corresponding threshold value), the UE records handover information of the successful handover. In the current 3GPP concluded, the UE may inform the network side of the successful handover report Available on it (as indicated by the succhrep-Available information element) 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 successful ho report req indication in the UEInformationRequest message). The UE reports the saved radio link failure report (successful report in the UEInformationResponse message) to the network side in the response RRC message. Successful handover reports saved on the UE may be saved for up to 48 hours.

In the scenario of not being configured with DC, a successful handover procedure means that the link of the primary cell can successfully receive the handover command. Even if the link state of the main base station is not good at this time (such as the timer T310 or T312 for link failure monitoring when the handover command is received), the main base station is in a state in which at least the handover command can be successfully received. When the DC is configured, the network side may send the handover command to the UE through the SCG path in two cases, one is that when the primary base station link is configured with the split SRB and the primary base station link has not failed in the radio link, the primary base station issues the handover command through the secondary base station path of the split SRB, and the other is that in the MCG failure information process, the primary base station issues the handover command through the secondary base station path of the split SRB or SRB3. Since the handover command is received from the secondary base station 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. Further, in one implementation on the network side, different handover parameters may be used based on whether the DC is configured. For example, in an unconfigured DC scenario, the corresponding handover parameters may be relatively conservative values, i.e., a handover needs to be triggered before the main base station link state is good and no problem occurs. In the DC-configured scenario, in combination with the current secondary base station link, the corresponding handover parameters may be set relatively late, since when the primary base station link is not in good condition, the handover command is still allowed to be sent through the secondary base station link. Then different parameter adjustment methods can be used on the network side for successful handover reporting that occurs in both cases. However, the current successful handover report does not consider the DC scenario, and the successful handover report is not necessarily reported to the base station related to the current handover immediately after the successful handover, but may reach the base station related to the current handover after a period of time of the handover, and the base station has deleted the context information of the UE at this time, which results in that based on the current successful handover report, when the base station receives a successful handover report, the base station cannot know whether the corresponding handover is configured with the DC, or from which path the handover command is received. In addition, under the fast MCG link recovery mechanism, the UE runs T316 to wait for the handover command on the network side after the RLF occurs on the MCG link. Suppose that the operation duration of T316 reaches T and receives the handover command, which means that the MCG link fails for T time before receiving the handover command. Under normal conditions, the handover command should be issued to the UE before the MCG RLF, so as to avoid data interruption caused by the MCG RLF. However, the conventional successful handover report makes the base station unable to know that the handover occurs in the above scenario after receiving the successful handover report, which brings inaccuracy to the adjustment and optimization of the handover parameters. The above problems are successfully addressed by the present disclosure.

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

Example 1:

the embodiment presents a handover information reporting method performed on a UE. By the method of the embodiment, when the UE configures the DC, if the handover command is successfully received through the SCG path, the UE may report the relevant information to the base station in the successful handover report, so as to provide more accurate handover information to the network side. The base station may incorporate the DC-related information in the successful handover report for adjustment and optimization of handover parameters.

Hereinafter, example 1 of the present invention will be described with reference to fig. 2. Fig. 2 is a flowchart illustrating a handover information reporting method in example 1 according to an embodiment of the present invention.

As shown in fig. 2, in step 1, the UE receives a handover command from the network side and performs handover. Optionally, the handover command includes a configuration of one or more trigger conditions (e.g., threshold values of T310/T312/T304) for triggering a successful handover report. Optionally, the triggering condition includes that T310 exceeds a configured threshold, T312 exceeds a configured threshold, T304 exceeds a configured threshold, a random access resource used by the handover procedure is not a dedicated random access resource configured in the handover command, the UE is configured with a DC, or the handover command corresponding to the handover procedure is successfully received through an SCG link, and so on.

In step 2, if the UE determines that one or more of the trigger conditions for triggering the successful handover report are satisfied, the UE saves the information of the successful handover in the successful handover report variable. Which comprises the following steps:

if the handover command corresponding to the handover procedure is successfully received through the SCG link or the UE is configured with the DC, the successful handover report includes first information for indicating a state of the SCG link when the handover command is successfully received. The SCG status may be whether T310 corresponding to SCG is running, a value of the running of T310 corresponding to SCG, whether T310 corresponding to SCG times out, or whether the SCG is in SCG failure state (such as RLF) or suspend state.

If the handover command corresponding to the handover procedure is successfully received through the SCG link or the UE is configured with the DC, the successful handover report includes second information for indicating the latest measurement result of the SCG cell when the handover command is successfully received. Optionally, the SCG cell refers to a PSCell. Optionally, the SCG cell includes one or more cells with the best link quality among all serving cells of the SCG. Optionally, the SCG includes all serving cells of the SCG. As can be seen, the third information further includes a cell identifier of the SCG cell, or an indicator indicating that the cell is the SCG cell.

If the handover command corresponding to the handover procedure is successfully received through the SCG link, the successful handover report includes third information for indicating that the handover command is successfully received through the SCG link.

Optionally, the UE includes one or more of the first to third information in a successful handover report when configured with split SRB1 or SRB3.

Example 2:

the embodiment presents a handover information reporting method performed on a UE. By the method of the embodiment, when the UE executes the fast MCG link recovery mechanism, and the handover command is successfully received through the SCG path as a response to the MCG failure information, the UE may report the relevant information to the base station in the successful handover report, so as to provide more accurate handover information to the network side. The base station may adjust and optimize handover parameters in combination with information about the UE performing the fast MCG link recovery procedure in the successful handover report.

Hereinafter, example 2 of the present invention will be described with reference to fig. 3. Fig. 3 is a flowchart showing a handover information reporting method in embodiment 2 as an example of the present invention.

As shown in fig. 3, in step 1, the UE receives a handover command from the network side and performs handover. Optionally, the handover command includes a configuration of one or more trigger conditions (e.g., threshold values of T310/T312/T304) for triggering a successful handover report. Optionally, the trigger condition includes that T310 exceeds a configured threshold, T312 exceeds a configured threshold, T304 exceeds a configured threshold, the random access resource used in the handover procedure is not a dedicated random access resource configured in the handover command, the handover command is a response as MCG failure information, T316 exceeds a configured threshold, and the like.

In step 2, if the UE determines that one or more of the triggering conditions for triggering the successful handover report are satisfied, the UE saves the information of the successful handover in a successful handover report variable, which includes:

if the handover command corresponding to the handover procedure is a response to the MCG failure information, the successful handover report includes fourth information, which is used to indicate that the MCG is in the RLF state when the handover command is successfully received.

If the handover command corresponding to the handover process is a response to MCG failure information, or the trigger condition is a T316 threshold value, where the trigger condition is satisfied, that is, the operation value of T316 when the handover command is received exceeds the T316 threshold value, the successful handover report includes fifth information for indicating the operation value of T316 when the handover command is successfully received;

if the handover command corresponding to the handover procedure is a response to MCG failure information, or the triggering condition is a T316 threshold value, where the triggering condition is satisfied, that is, the operation value of T316 when the handover command is received exceeds the T316 threshold value, the successful handover report includes sixth information for indicating that the operation value of T316 when the handover command is successfully received exceeds the T316 threshold value.

The handover command is a response to the MCG failure information, which means that the UE has a T316 timer running when the handover command is successfully received.

Example 3:

the embodiment presents a handover information reporting method performed on a UE. By the method of the embodiment, the UE can report the DC related information to the base station in the successful handover report, so as to provide more accurate handover information to the network side. This embodiment provides a method for reporting the handover information report in embodiment 1 or embodiment 2 by the UE through the RRC procedure.

Step 1: the UE receives a UEInformationRequest message from the network side, where the UEInformationRequest message carries an indication/request for requesting the UE to report the saved successful handover report.

Step 2: and the UE includes the content in the saved successful handover report in a UEInformationResponse message 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 to sixth information in the foregoing embodiments.

Example 4:

this embodiment explains the user equipment UE of the present disclosure. Fig. 4 is a block diagram showing a user equipment UE according to the present invention. As shown in fig. 4, the user equipment UE40 includes 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 (e.g., random access memory RAM), a Hard Disk Drive (HDD), non-volatile memory (e.g., flash memory), or other memory, etc. The memory 402 has stored thereon program instructions. Which when executed by the processor 401 may perform the handover information reporting method described above in detail in the present invention.

The method of the present disclosure and the related apparatus have been described above in connection with preferred embodiments. Those skilled in the art will appreciate that the methods illustrated above are exemplary only. The methods of the present disclosure are not limited to the steps or sequences shown above. The base station and the user equipment shown above may comprise further modules, for example, modules that may be developed or developed in the future, which may be available for the base station, MME, or UE, etc. The various identifiers shown above are merely exemplary and not limiting, and the present disclosure is not limited to the specific information elements that are examples of these identifiers. Many variations and modifications may occur to those skilled 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 that causes 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 memory (such as a random access memory RAM), a Hard Disk Drive (HDD), a nonvolatile memory (such as a flash memory), or other memory system.

A program for implementing 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 the 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 that stores a program for short-term dynamics, or any other recording medium that is readable by a computer.

Various features or functional blocks of the devices used in the above-described embodiments may be implemented or performed by circuitry (e.g., a single or multiple chip integrated circuits). Circuitry 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 technology has emerged as a replacement for existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present disclosure may also be implemented using such new integrated circuit technology.

Further, the present disclosure is not limited to the above-described embodiments. While various examples of the embodiments have been described, the present disclosure is not so limited. 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.

As above, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. However, the specific configuration is not limited to the above embodiment, and the present disclosure also includes any design modification 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 technical means disclosed in different embodiments are also included in the technical scope of the present disclosure. Further, components having the same effects described in the above embodiments may be substituted for each other.

Claims

1. A handover information reporting method, comprising:

user Equipment (UE) receives a switching command from a network side and executes switching based on the switching command;

under the condition that the UE judges that at least one condition in trigger conditions for triggering a successful handover report is met, the UE saves the information of the successful handover in the successful handover report;

if the handover command corresponding to the handover procedure is successfully received through an SCG link of a secondary cell group or the UE is configured with a dual connectivity DC, first information is included in the successful handover report, wherein the first information is used for indicating the state of the SCG link when the handover command is successfully received.

2. The handover information reporting method of claim 1, wherein,

the successful handover report further includes second information, where the second information is used to indicate a latest measurement result of the SCG cell when the handover command is successfully received.

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

if the handover command corresponding to the handover procedure is successfully received through the SCG link, the successful handover report includes third information, where the third information is used to indicate that the handover command is successfully received through the SCG link.

4. The handover information reporting method of claim 1 or 2, wherein,

the trigger condition includes: t310 exceeds the configured threshold, T312 exceeds the configured threshold, T304 exceeds the configured threshold, the random access resource used by the handover procedure is not the dedicated random access resource configured in the handover command, the UE is configured with DC, and the handover command corresponding to the handover procedure is successfully received through the SCG link.

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

the SCG status indicates whether T310 corresponding to the SCG is running, a value of running of T310 corresponding to the SCG, whether T310 corresponding to the SCG is timed out, whether the SCG is in SCG failure state or suspend state.

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

and when receiving the UEInformationRequest message containing the successful switching report request indication from the network side, the UE contains the content in the stored successful switching report in the UEInformationResponse message and sends the UEInformationResponse message to the network side.

7. A handover information reporting method, comprising:

under the condition that the UE judges that at least one condition in trigger conditions for triggering a successful switching report is met, the UE saves the information of the successful switching in the successful switching report;

if the handover command corresponding to the handover procedure is a response to the master cell group MCG failure information, the successful handover report includes fourth information, where the fourth information is used to indicate that the MCG is in a radio link failure RLF state when the handover command is successfully received.

8. The handover information reporting method of claim 7, wherein,

the successful handover report further includes fifth information, where the fifth information is used to indicate an operation value of T316 when the handover command is successfully received.

9. The handover information reporting method of claim 7 or 8, wherein,

when the operation value of T316 at the time of receiving the handover command exceeds the threshold value of T316, sixth information is further included in the successful handover report, where the sixth information is used to indicate that the operation value of T316 at the time of successful reception of the handover command exceeds the threshold value of T316.

10. A user equipment, UE, comprising:

a processor; and

a memory storing instructions;

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