CN112243273A

CN112243273A - Information reporting method and corresponding user equipment

Info

Publication number: CN112243273A
Application number: CN201910643962.1A
Authority: CN
Inventors: 常宁娟; 刘仁茂
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2019-07-16
Filing date: 2019-07-16
Publication date: 2021-01-19
Also published as: WO2021008478A1

Abstract

The disclosure provides an information reporting method executed by user equipment and corresponding user equipment. The information reporting method executed by the user equipment is a UE information reporting method which is realized on the user equipment UE and is used for the condition switching process, and comprises the following steps: a condition switching monitoring and executing step, wherein the UE receives a condition switching command containing a switching executing condition, stores a condition switching configuration, detects whether the switching executing condition is met or not based on the configuration of the switching executing condition, and if the switching executing condition is met, the UE executes the switching to a corresponding condition switching target cell according to the stored condition switching configuration; a step of completing the conditional switch, wherein the UE successfully completes the conditional switch; and an information reporting step, wherein if UE configures UE information reporting and if the UE sends the UE information reporting message within a period of time before a switching execution condition corresponding to the condition switching process is met, the UE initiates sending of the UE information reporting message to a target cell.

Description

Information reporting method and corresponding user equipment

Technical Field

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

Background

In 6.2018, a New research Project of 5G technical standards was approved at the third Generation Partnership Project (3rd Generation Partnership Project: 3GPP) RAN #80 Congress (see non-patent document: RP-181433: New WID on NR (New Radio) mobility enhancements). In addition, there is another new research project of Release 16 (see non-patent document: RP-190272: WID for Even funcher Mobility enhancement in E-UTRAN (Evolved-Universal Terrestrail Radio Access Network)). One of the research objectives of these two projects is to find a way to meet one of the mobility needs in the network: seamless handover, that is, handover interruption time of 0ms or close to 0ms can be satisfied during cell handover, and the robustness of handover is enhanced. Among the solutions under investigation to reduce HandOver interruption time and/or enhance HandOver robustness, there is a solution known as Conditional HandOver (CHO). In the CHO mechanism, a base station issues a handover command to a UE (User Equipment) in advance, where the handover command includes condition configuration information. And the UE executes the switching according to the switching command received before when the configured condition is met. Therefore, the success rate of receiving the switching command can be improved by issuing the switching command in advance, so that the success rate of switching is improved, and the time delay of service interruption caused by switching failure due to the failure of receiving the switching command is avoided.

In addition, the 3GPP RAN2 working Group is currently discussing a fast MCG (Master Cell Group) link recovery mechanism. The fast MCG link recovery mechanism is relative to existing link recovery mechanisms (i.e., recovering the link connection through an RRC connection re-establishment procedure). In the fast MCG Link recovery mechanism, when an MCG of a UE generates an RLF (Radio Link Failure), if the quality of an auxiliary Cell Group (SCG) Link of the UE is good, the UE initiates an MCG Failure (information) flow, and reports the MCG Link Failure information to a master base station through the SCG Link, instead of directly triggering an RRC connection re-establishment process. The master base station receiving the MCG link failure information report may send an RRC connection reconfiguration message to the UE to trigger the UE to switch to a new cell or send an RRC release message to release the connection of the UE.

The present disclosure proposes a solution to the problem of reporting UE information in the case where a CHO or fast MCG link recovery mechanism is configured in an NR system and an LTE (Long Term Evolution) system.

Disclosure of Invention

The purpose of the embodiments of the present disclosure is to provide a solution to the problem of reporting UE information in the NR system and the LTE system when a CHO or fast MCG link recovery mechanism is configured. More specifically, the present disclosure proposes a solution to the problem of UE information loss or inaccuracy when a CHO or fast MCG link recovery procedure occurs. The embodiment of the disclosure provides an information reporting method executed by user equipment and corresponding user equipment.

According to a first aspect of the present disclosure, an information reporting method performed by a user equipment is provided, which is a UE information reporting method implemented on a user equipment UE and used for a conditional handover process, and includes the following steps: a condition switching monitoring and executing step, wherein the UE receives a condition switching command containing a switching executing condition, stores a condition switching configuration, detects whether the switching executing condition is met or not based on the configuration of the switching executing condition, and if the switching executing condition is met, the UE executes the switching to a corresponding condition switching target cell according to the stored condition switching configuration; a step of completing the conditional switch, wherein the UE successfully completes the conditional switch; and an information reporting step, wherein if UE configures UE information reporting and if the UE sends the UE information reporting message within a period of time before a switching execution condition corresponding to the condition switching process is met, the UE initiates sending of the UE information reporting message to a target cell.

In the above method for reporting information, preferably, the successfully completing the conditional switch includes one or more of the following: submitting a response message for responding to the handover command to the target cell for handover to the lower layer to transmit the message; successfully sending a response message for responding to the handover command to the target cell for handover; the media access control MAC layer successfully completes the random access process for accessing the target cell; when the random access channel RACH is configured to be skipped, the MAC layer indicates that the physical downlink control channel PDCCH scrambled by the radio network temporary identity RNTI of the UE is successfully received.

In the above method for reporting information performed by a ue, it is preferable that the handover execution condition corresponding to the conditional handover procedure satisfies one or more of the following conditions: before the switching condition corresponding to a target cell in the stored conditional switching configuration is met; before the UE executes the switching to a target cell according to the stored conditional switching configuration; before the UE accesses a conditional switch target cell.

In the above method for reporting information performed by a user equipment, preferably, the condition executed in the step of reporting information further includes: the UE is configured with conditional handover, i.e. there is a stored conditional handover configuration on the UE.

In the above method for reporting information performed by a UE, preferably, when the UE information is an in-device coexistence IDC indication, if the UE is configured to provide the IDC indication to a network side, and if the UE sends a radio resource control RRC message including the IDC indication information within a period of time before a handover execution condition corresponding to the condition handover process is satisfied, the UE initiates sending of the RRC message including the IDC indication information to a target cell; when the UE information is a power selection indication PPI, overheating assistance information, semi-persistent scheduling SPS assistance information, a delay budget report, or a maximum bandwidth selection indication, if the UE is configured to provide the PPI, the overheating assistance information, the SPS assistance information, the delay budget report, or the maximum bandwidth selection indication to a network side, and if the UE sends an RRC message including the PPI, the overheating assistance information, the SPS assistance information, the delay budget report, or the maximum bandwidth selection indication within a period of time before a handover execution condition corresponding to the conditional handover process is satisfied, the UE initiates sending of an RRC message including corresponding UE information to a target cell; when the UE information is Multimedia Broadcast Multicast Service (MBMS) interest indication information, if a main cell broadcasts a system information block for MBMS and if the UE sends an RRC message containing the MBMS interest indication within a period of time before a switching execution condition corresponding to the condition switching process is met, the UE determines an interested MBMS frequency set and/or an interested MBMS service set and initiates the RRC message containing the MBMS interest indication; when the UE information is edge communication sidelink information, if the primary cell broadcasts a system information block for sidelink communication, sidelink discovery, or vehicle networking V2X sidelink communication, and if the UE sends an RRC message of sidelink UE information indicating that a parameter associated with the target primary cell related to the sidelink communication, the sidelink discovery, or the V2X sidelink communication is changed within a period of time before a handover execution condition corresponding to the conditional handover process is satisfied, the UE initiates sending of an RRC message including the sidelink UE information to the target cell.

According to a second aspect of the present disclosure, an information reporting method performed by a user equipment is provided, which is implemented on a UE and used in an RRC connection recovery process after an RLF, and includes the following steps: a radio link monitoring step, in which the UE monitors that radio link failure RLF occurs; a step of wireless link recovery, in which if the UE is configured with a rapid master cell group MCG link failure recovery mechanism, the UE initiates an MCG failure indication process, wherein the process comprises generating an RRC message for indicating MCG failure and delivering the RRC message to a lower layer to send the message; and an information reporting step, wherein if the UE sends an RRC message for reporting the UE information to the network side within a period of time before the RLF is detected, the UE initiates the sending of the RRC message to the network side.

In the above information reporting method performed by the user equipment, preferably, the RRC message for indicating MCG failure includes an MCG link failure indication, an MCG link failure reason, and a measurement result, and is used to notify a network side that RLF of MCG occurs.

In the above method for reporting information performed by the user equipment, preferably, when the UE information is an IDC indication, if the UE is configured to provide the IDC indication to the network side, and if the UE sends an RRC message including the IDC indication information within a period of time before detecting the RLF, the UE initiates sending of the RRC message including the IDC indication information to the network side; when the UE information is PPI, overheating assistance information, SPS assistance information, a delay budget report or a maximum bandwidth selection indication, if the UE is configured to provide the PPI, the overheating assistance information, the SPS assistance information, the delay budget report or the maximum bandwidth selection indication to the network side, and if the UE sends an RRC message containing the PPI, the overheating assistance information, the SPS assistance information, the delay budget report or the maximum bandwidth selection indication within a period of time before the RLF is detected, the UE initiates sending of the RRC message containing the corresponding UE information to the network side; when the UE information is MBMS interest indication information, if a main cell broadcasts a system information block for MBMS and if the UE sends an RRC message containing the MBMS interest indication in a period of time before the RLF is detected, the UE determines an interested MBMS frequency set and/or an interested MBMS service set and sends the RRC message containing the MBMS interest indication to a network side; when the UE information is sidelink information, if the primary cell broadcasts a system information block for sidelink communication, sidelink discovery, or V2X sidelink communication, and if the UE sends an RRC message indicating that parameters related to the primary cell for sidelink communication, sidelink discovery, or V2X sidelink communication are changed within a period of time before RLF is detected, the UE initiates sending of the RRC message including the sidelink UE information to the network side.

In the above information reporting method performed by the user equipment, preferably, the period of time before the RLF is detected is a period of time before an RRC message for indicating an MCG failure is sent, or a period of time before an MCG failure indication procedure is triggered.

According to a third aspect of the present disclosure, a user equipment is provided, comprising: a processor; and a memory having instructions stored thereon, which, when executed by the processor, cause the user equipment to perform the above-described information reporting method.

According to the information reporting method executed by the user equipment and the corresponding user equipment, the UE can report more accurate UE information in the condition switching process, and the condition that the reported UE information is out of date or the UE information is not reported is avoided, so that the service quality and the service continuity of corresponding services are better ensured; when the UE uses a rapid MCG link failure recovery mechanism, the UE can report more accurate UE information, or the condition that the reported UE information is out of date or the UE information is not reported is avoided, so that the service quality and the service continuity of the corresponding service before and after the wireless link recovery process are better ensured.

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 flow chart of a general handover procedure in an LTE/NR system.

Fig. 2 is a flowchart of an information reporting method performed by a user equipment UE according to embodiment 1 of the present disclosure.

Fig. 3 is a flowchart of an information reporting method performed by a user equipment UE according to embodiment 2 of the present disclosure.

Fig. 4 is a block diagram of a schematic structure of a user equipment UE according to the present disclosure.

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 skilled in the art will recognize that many changes and modifications may be made to the embodiments described herein 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 Long Term Evolution (LTE)/NR mobile communication system and its subsequent Evolution are taken as an example application environment, and a plurality of embodiments according to the present disclosure are specifically described. 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 is also updated accordingly. The source cell may also be referred to as a source base station, a source beam (beam), and a Transmission point (TRP), and the target cell may also be referred to as a target base station, a target beam, and a target Transmission point. The source cell refers to a cell serving the UE, which is connected before the handover procedure is initiated, i.e., a cell that sends an RRC message containing a handover command to the UE. The target cell refers to a cell serving the UE to which the UE is connected after the handover procedure is successfully completed, or a cell indicated by the target cell identifier included in the handover command. 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 with sync) information element, and further, an RRC reconfiguration message including a synchronization reconfiguration (reconfiguration with sync) information element for a Master Cell Group (MCG), so the handover in the NR system may also be referred to as MCG synchronization reconfiguration. In the LTE system, the RRC connection reconfiguration message includes a mobility control information (mobility control information) information element. The synchronization reconfiguration information element or the mobility control information element includes 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 conditional switch command and the conditional switch configuration are replaceable.

In the present disclosure, after receiving a Radio Resource Control (RRC) message containing a handover command, the UE still maintains communication with the source base station including data transmission before initiating the handover procedure, so as to further reduce the time for data transmission interruption.

The following presents a simplified summary of the prior art to which embodiments of the present disclosure relate.

General handover procedure in existing mechanisms:

a general handover procedure in the LTE/NR system is first briefly described. The mobility of the connected user is mainly realized through a handover process, i.e. a process in which the UE in the RRC connected state changes the serving cell. The process is shown in FIG. 1 and briefly described as follows:

stage 1: and (5) a measuring stage. A base station issues measurement configuration to User Equipment (UE); and the UE measures the wireless link corresponding to the serving cell or the adjacent cell based on the measurement configuration, and sends a measurement report to the base station when the configured measurement reporting condition is met. The measurement phase is not necessary and the UE can also be handed over blindly when the base station has no valid measurement report.

And (2) stage: and a switching preparation phase. The base station determines whether to trigger a handover for the UE in conjunction with the received measurement reports and other factors such as base station loading. If the UE is determined to be triggered to be switched, the source base station initiates a switching preparation process by sending a switching request message to the target base station. The target base station determines whether to accept the switching request of the UE according to factors such as the context of the UE, the available resources of the target base station and the like in the switching request message, if so, the target base station replies a switching confirmation message to the source base station, wherein the switching confirmation message comprises an RRC message between base stations (inter-node), namely a switching command.

And (3) stage: and switching the execution phase. And the source base station issues the switching command to the UE and starts to forward the data of the UE to the target base station. The UE receiving the switching command immediately executes the switching by applying the configuration of the switching command, accesses to the target base station through the random access process and sends a confirmation message to the target base station. Wherein a random access procedure is not necessary.

And (4) stage: and a switching completion stage. And after the target base station confirms that the UE is successfully accessed, the target base station sends a switching completion message to the source base station. The source base station can release the UE context saved thereon accordingly.

As can be seen from the above, the handover procedure in the current system may cause interruption of data transmission, and in the LTE system of Release 14, optimization of the handover procedure, such as handover without a random access procedure, connection Before disconnection (mbeb), and the like, all aim to reduce data interruption time in the handover procedure.

Condition-based handover:

next, the switching based on the condition is briefly described. As mentioned above, in the requirement of Release 16 technology, it is required to satisfy the data interruption delay of "0 ms" as much as possible in the mobile handover process, and to improve the robustness of the handover to meet the mobility requirement of seamless handover in NR. In the current handover process, one reason for causing a handover failure and causing a long-time data transmission interruption is that the handover command fails to be received due to untimely issuing of the handover command. One possible approach to this problem is conditional based switching (shortly called conditional switching). In the conditional handover, a relatively conservative measurement report threshold is set, so that the base station obtains the measurement result in advance, and performs handover preparation in advance according to the measurement result and the selected target base station, so that the base station can issue a handover command to the UE in advance before a real handover condition (corresponding to the conservative measurement report threshold) is met, wherein the handover condition is carried by the UE. Different from the existing LTE handover mechanism, after receiving a conditional handover command, the UE does not immediately perform handover, but stores the received handover command configuration, and starts to monitor the link quality of the source cell or the link quality of the target cell according to the handover execution condition carried in the handover command message. Only when it is monitored that the configured handover execution condition is satisfied, the UE starts executing the saved handover command to access to the target cell (i.e., access to the target cell according to the saved conditional handover configuration corresponding to the target cell satisfying the condition). For the above-mentioned switching mechanism, the present disclosure refers to conditional switching, but the name is not limited thereto, and may refer to a switching mechanism of an early switching command, a pre-switching, an early switching preparation, a switching including a switching execution condition, and the like.

Link recovery mechanisms in existing mechanisms:

again, a link recovery mechanism of the existing mechanisms is introduced. In the existing mechanism, when RLF of the master cell group occurs, the UE initiates an RRC connection re-establishment procedure to re-establish/restore 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. When receiving the RRC connection reestablishment message for responding to the RRC connection reestablishment request message, the UE executes the RRC configuration included in the message, returns an RRC connection reestablishment complete message to the network side, successfully ends the RRC connection reestablishment process, and recovers the RRC connection with the network side.

Fast MCG link recovery mechanism:

the 3GPP RAN2 working group is currently in one work item: the dual link and carrier aggregation enhancement project (see document RP-190452) discusses a fast MCG link recovery mechanism. The term "fast" is used in relation to existing link recovery mechanisms, i.e. recovering the link connection through an RRC connection re-establishment procedure. In the fast MCG link recovery mechanism, when an RLF occurs in an MCG of a UE, if a link quality of a Secondary Cell Group (SCG) of the UE is good (that is, the RLF does not occur, or a timer T310 is not running, 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, the UE initiates an MCG failure (information) procedure, and reports information of the MCG link failure to a host base station through an SCG link (such as a split signaling radio bearer split SRB or a third signaling radio bearer SRB3), instead of directly triggering an RRC connection re-establishment procedure. In the MCG failure (information) procedure, the UE suspends all MCG side transmissions corresponding to SRBs and DRBs, and may also reset the MAC entity corresponding to MCG. The master base station receiving the MCG link failure information report may send an RRC connection reconfiguration message (i.e., handover command) to the UE to trigger the UE to perform handover or send an RRC release message to release the connection of the UE. 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. The fast MCG link recovery mechanism is not limited in its name in this disclosure, and may also be referred to as MCG recovery by SCG, MCG failure procedure, MCG failure information, enhanced MCG link recovery, and the like.

Reporting UE information in the existing mechanism:

the reporting of UE information involved in the present disclosure includes the following several situations.

For a UE supporting Multimedia Broadcast Multicast Service (MBMS), the network side may be notified of the MBMS Service being received by the UE or the MBMS Service of interest through an RRC message (MBMS interest indication message), and may also be notified of the priority of receiving the MBMS Service and the unicast Service, etc. The purpose of this is to enable the network side to consider the requirements of the MBMS service of the UE when making decisions on the scheduling and mobility of the UE after knowing these information, so as to ensure the continuity of the MBMS service. The RRC message may include MBMS service frequency information that the UE is receiving or interested in, MBMS priority information indicating whether the UE considers that the MBMS service is received prior to unicast reception, MBMS service information that the UE is receiving or interested in receiving (such as Temporary Mobile Group Identity (TMGI)), and the like.

For a UE supporting edge communication (sidelink) and Vehicle-to-event (V2X), it may indicate to the network side through an RRC message (sidelink UE information message) that it is interested in reception of sidelink communication (communication), sidelink discovery (discovery), or V2X communication or no longer interested. The UE may also request the network side for resource allocation or resource release for sidelink communication or discovery or V2X communication through the RRC message, and may also report related parameters of sidelink discovery from inter-frequency/inter-plmn (public Land Mobile network) system information to the network side through the RRC message. The network side may perform corresponding resource management, handover target cell determination, and the like on the UE based on the information reported by the UE, so as to ensure the service quality and service continuity of sidelink service and V2X service of the UE.

For a UE supporting In-Device Coexistence (IDC) indication information reporting, the UE may notify the network side of the IDC problem experienced or the change of the IDC problem experienced through an RRC message (In-Device Coexistence indication message), and may also provide some information to the network side to solve the IDC problem, such as affected carrier frequency information, suggested time division multiplexing assistance information, and the like.

In addition, for a UE supporting Power Preference Indication (PPI) or Semi-persistent Scheduling (SPS) assistance information provision or delay budget report (delay budget report) or overheating assistance information report, the network side may also be informed of its Power saving selection, SPS assistance information, maximum physical channel bandwidth configuration selection, overheating assistance information, or a delay budget report including an increase or decrease of Uu interface reception delay expectation, etc. through an RRC message (ueassistanscenlnformation). The network side can adjust the configuration of the UE based on the auxiliary information to meet the requirements of the UE.

For convenience of description, the information reported by the UE to the network side is collectively referred to as UE information in the present disclosure, and the corresponding RRC message for reporting the UE information is collectively referred to as UE information reporting message.

During handover, when handover is successfully completed, if the UE is configured to provide PPI, overheat assistance information, SPS assistance information, delay budget report, or maximum bandwidth selection indication to the network side, the UE determines whether the UE assistance information ueassistanserinformation message is sent within one second before receiving a handover command, and if so, the UE initiates sending of the UE assistance information ueassistanserinformation message to a target cell after successful handover. If the UE is configured to provide the IDC indication for the network side, the UE judges whether the in-device coexistence indication InDeviceCoexindication message is sent within one second before the switching command is received, and if so, the UE sends the in-device coexistence indication InDeviceCoexindication message to the target cell which is successfully switched. If the primary cell broadcasts a system information block (such as SIB15) for MBMS, the UE determines whether an MBMS interest indication mbmsinterindication message is sent within one second before receiving the handover command, and if so, the UE determines an MBMS frequency set and/or an MBMS service set of interest thereof, and initiates an MBMS interest indication mbmsinterindication message. If the primary cell broadcasts the system information block (such as SIB18, SIB19, SIB21) for sidelink communication or sidelink discovery or V2X sidelink communication, the UE determines whether it has transmitted an edge communication UE information sidelink information message indicating that its sidelink communication or sidelink discovery or V2X sidelink communication-related parameter associated with the target primary cell has changed within one second before receiving the handover command, and if so, the UE initiates transmission of the sidelink communication UE information message to the target cell. This is done to prevent the UE information from being unsuccessfully delivered to the target cell during handover, which results in the target cell not being able to obtain the latest UE information.

In the RRC connection re-establishment procedure of the existing mechanism, after the UE successfully completes the RRC connection re-establishment procedure, if the primary cell broadcasts a system information block (e.g., SIB15) for the MBMS, the UE determines whether an MBMS interest indication mbmsinterindication message is sent within one second before the RLF is monitored, and if so, the UE determines an MBMS frequency set and/or an MBMS service set of interest thereof, and initiates the MBMS interest indication mbmsinterindication message. If the primary cell broadcasts the system information block for sidelink communication, sidelink discovery or V2X sidelink communication, the UE judges whether the UE sends an edge communication UE information sidelink information message for indicating that the sidelink communication, sidelink discovery or V2X sidelink communication related parameter associated with the primary cell is changed within one second before monitoring RLF, if so, the UE starts sending the edge communication UE information sidelink information message to the primary cell. The purpose of this is to prevent the UE information from being unsuccessfully reported to the primary cell for re-establishment during the RLF and RRC connection re-establishment process, so that the primary cell cannot obtain the latest UE information.

As described above, after introducing the fast MCG failure recovery mechanism, when the RLF occurs, the UE may recover the connection with the network side through handover performed by handover signaling received from the SCG from the MCG, instead of directly performing the RRC connection re-establishment procedure. According to the UE information reporting mechanism in the handover procedure and the RLF/RRC connection re-establishment procedure in the existing mechanism, it may be possible that the UE information that is desired to be reported to the network side before the RLF occurs is monitored by the UE and cannot be delivered to the main cell after handover, thereby causing an impact on the service continuity or service quality of the corresponding service, such as the MBMS. This is a problem that the present disclosure is intended to solve.

In addition, according to the existing mechanism, after the UE completes handover, if the UE information report message is sent within one second before the UE receives the handover command, the UE initiates sending of the UE information report message to the target cell after successful handover. When the conditional handover is configured, since the UE may not perform the handover immediately when receiving the conditional handover command, the UE information reported to the target cell after the handover is successful according to the existing mechanism may be outdated or may be missed. Thereby causing an impact on service continuity or service quality of a corresponding service, such as MBMS. This is also a problem that the present disclosure is intended to solve.

The following are several embodiments of the present disclosure performed on a UE based on the above issues.

Example 1

The embodiment provides a UE information reporting method for a conditional handover procedure implemented on a UE. By the method of the embodiment, the UE can report more accurate UE information in the condition switching process, and the condition that the reported UE information is out of date or the UE information is not reported is avoided, so that the service quality and the service continuity of the corresponding service are better ensured. Next, this process is described using fig. 2.

Step S201 (condition switching completion step): the UE successfully completes the conditional switch.

The successful completion of conditional switch can also be expressed in the following ways: submitting a response message (RRC reconfiguration complete message) for responding to the handover command to the target cell for handover to the lower layer to transmit the message; (successfully) a response message (RRC reconfiguration complete message) for responding to the handover command to the target cell of the handover is transmitted; a Medium Access Control (MAC) layer successfully completes a random Access procedure for accessing a target cell; when a Random Access Channel (RACH) is configured, the MAC layer indicates that a Physical Downlink Control Channel (PDCCH) scrambled with a Radio Network Temporary Identifier (RNTI) of the UE is successfully received. The skipping of the RACH means that a random access process does not need to be executed on the target main cell in the switching process.

This step is preceded by a step S200 (conditional switch monitoring and execution step): the UE receives a conditional switch command containing a switch execution condition, saves the conditional switch configuration, and detects whether the switch execution condition is met based on the configuration of the switch execution condition. And if the switching execution condition is met, the UE executes the switching to the corresponding conditional switching target cell according to the stored conditional switching configuration.

Step S202 (information reporting step): and if the UE configures UE information reporting and if the UE sends the UE information reporting message within a period of time before the switching execution condition corresponding to the condition switching process is met, the UE initiates sending of the UE information reporting message to the target cell. Preferably, the period of time is 1 second.

Before the switching execution condition corresponding to the condition switching process is satisfied, the following conditions can be expressed as follows: before the switching condition corresponding to a target cell in the stored conditional switching configuration is met; before the UE executes the switching to a target cell according to the stored conditional switching configuration; before the UE accesses a conditional switch target cell.

The condition performed in step S202 further includes that the UE is configured with conditional handover. The UE configured with conditional handover may also be expressed as having a stored conditional handover configuration on the UE.

When the UE information is the IDC indication, step S202 may be described as: if the UE is configured to provide the IDC indication to the network side, and if the UE sends an RRC message (e.g., an indeccoxecution message) including the IDC indication information within a period of time before a handover execution condition corresponding to the conditional handover procedure is satisfied, the UE initiates sending of the RRC message including the IDC indication information to the target cell.

When the UE information is PPI, overheating assistance information, SPS assistance information, delay budget report, or maximum bandwidth selection indication, step S202 may be described as: if the UE is configured to provide the PPI, the overheating assistance information, the SPS assistance information, the delay budget report, or the maximum bandwidth selection indication to the network side, and if the UE sends an RRC message (e.g., a UE assistance information ueassistanserinformation message) including the PPI, the overheating assistance information, the SPS assistance information, the delay budget report, or the maximum bandwidth selection indication within a period of time before a handover execution condition corresponding to the conditional handover procedure is satisfied, the UE initiates sending of the RRC message including the corresponding UE information to the target cell.

When the UE information is MBMS interest indication information, step S202 may be described as: if the primary cell broadcasts a system information block (e.g., SIB15) for MBMS, and if the UE has sent an RRC message (e.g., MBMS service indication message) including an MBMS interest indication within a period of time before a handover execution condition corresponding to the conditional handover procedure is satisfied, the UE determines an MBMS frequency set and/or an MBMS service set of interest thereof, and initiates the RRC message including the MBMS interest indication.

When the UE information is sidelink information, step S202 may be described as: if the primary cell broadcasts a system information block for sidelink communication or sidelink discovery or V2X sidelink communication (e.g. corresponding to SIB18, SIB19, SIB21, respectively), and if the UE transmits an RRC message (e.g. sidelink UE information message) for sidelink UE information indicating that its sidelink communication or sidelink discovery or V2X sidelink communication has changed with respect to a parameter associated with the target primary cell within a period of time before a handover execution condition corresponding to the conditional handover procedure is satisfied, the UE initiates transmission of the RRC message including the sidelink UE information to the target cell.

Example 2

The embodiment provides a method for reporting UE information in an RRC connection recovery process after a radio link failure, which is realized on UE. By the method of the embodiment, when the UE uses the rapid MCG link failure recovery mechanism, the UE can report more accurate UE information, or the condition that the reported UE information is out of date or the UE information is not reported is avoided, so that the service quality and the service continuity of the corresponding service before and after the wireless link recovery process are better ensured. This process is described below using fig. 3.

Step S301 (wireless link monitoring step): the UE monitors the occurrence of radio link failure RLF.

Step S302 (wireless link recovery step): if the UE is configured with a fast MCG link failure recovery mechanism, the UE initiates an MCG failure indication process, wherein the process comprises generating an RRC message for indicating MCG failure and delivering the RRC message to a lower layer to send the message.

The RRC message for indicating MCG failure (for example, referred to as MCG failure information message MCGFailureInformation) is used to inform the network side (i.e., the main cell of the UE) that RLF of MCG occurs. The RRC message may include an MCG link failure indication, MCG link failure reason, measurement results, and the like.

The UE is configured with a fast MCG link failure recovery mechanism, which may also be described as the UE being enabled with the fast MCG link failure recovery mechanism, or the UE supporting the fast MCG link failure recovery mechanism.

Step S303 (information reporting step): if the UE sends an RRC message for reporting the UE information to the network side within a period of time before the RLF is detected in step S301, the UE initiates sending of the RRC message to the network side.

Preferably, the period of time is 1 second.

When the UE information is the IDC indication, step S303 may be described as: if the UE is configured to provide the IDC indication to the network side, and if the UE sends an RRC message (e.g., an indeccoxindication message) including the IDC indication information within a period of time before detecting the RLF, the UE initiates sending of the RRC message including the IDC indication information to the network side.

When the UE information is PPI, overheating assistance information, SPS assistance information, delay budget report, or maximum bandwidth selection indication, step S303 may be described as: if the UE is configured to provide the PPI, the overheating assistance information, the SPS assistance information, the delay budget report, or the maximum bandwidth selection indication to the network side, and if the UE sends an RRC message (e.g., UE assistance information uessistantanenceformation message) containing the PPI, the overheating assistance information, the SPS assistance information, the delay budget report, or the maximum bandwidth selection indication within a period of time before the RLF is detected, the UE initiates sending of the RRC message containing the corresponding UE information to the network side.

When the UE information is MBMS interest indication information, step S303 may be described as: if the primary cell broadcasts a system information block (such as SIB15) for MBMS, and if the UE has sent an RRC message (such as an MBMS service indication message) containing an MBMS interest indication within a period of time before detecting the RLF, the UE determines its MBMS frequency set and/or MBMS service set of interest, and initiates transmission of the RRC message containing the MBMS interest indication to the network side.

When the UE information is sidelink information, step S303 may be described as: if the primary cell broadcasts a system information block for sidelink communication or sidelink discovery or V2X sidelink communication (e.g. corresponding to SIB18, SIB19, SIB21, respectively), and if the UE transmits an RRC message for sidelink UE information (e.g. sidelink UE information message) indicating that its sidelink communication or sidelink discovery or V2X sidelink communication has changed with respect to parameters associated with the primary cell within a period of time before RLF is detected, the UE initiates transmission of the RRC message including the sidelink UE information to the network side.

Optionally, in this embodiment, the period of time before the RLF is detected may also be a period of time before the RRC message for indicating the MCG failure is sent in step S302 or may be a period of time before the MCG failure indication procedure is triggered in step S302.

Example 3

The embodiment provides a method for reporting UE information in an RRC connection recovery process after a radio link failure, which is realized on UE. By the method of the embodiment, when the UE uses the rapid MCG link failure recovery mechanism, the UE can report more accurate UE information, or the condition that the reported UE information is out of date or the UE information is not reported is avoided, so that the service quality and the service continuity of the corresponding service before and after the wireless link recovery process are better ensured.

Step 1: the UE monitors the occurrence of radio link failure RLF.

Step 2: the UE initiates an MCG failure indication procedure, which includes generating an RRC message indicating MCG failure, to be delivered to a lower layer to transmit the message.

Optionally, step 2 is performed when the UE is configured with a fast MCG link failure recovery mechanism. The UE is configured with a fast MCG link failure recovery mechanism, which may also be described as the UE being enabled with the fast MCG link failure recovery mechanism, or the UE supporting the fast MCG link failure recovery mechanism.

And step 3: the UE receives an RRC reconfiguration message from the MCG, wherein the RRC reconfiguration message is used for instructing the UE to execute the switching. As mentioned previously, the RRC message is relayed over the SCG link.

And 4, step 4: and the UE executes the switching according to the switching command in the step 3 and successfully completes the switching.

The successful completion of the handover can also be expressed in the following ways: submitting a response message (RRC reconfiguration complete message) for responding to the handover command to the target cell for handover to the lower layer to transmit the message; (successfully) a response message (RRC reconfiguration complete message) for responding to the handover command to the target cell of the handover is transmitted; a Medium Access Control (MAC) layer successfully completes a random Access procedure for accessing a target cell; the MAC layer indicates that a PDCCH scrambled with a Radio Network Temporary Identifier (RNTI) of the UE is successfully received when the RACH is configured to be skipped. The skipping of the RACH means that a random access process does not need to be executed on the target main cell in the switching process.

And 5: if the UE sends an RRC message for reporting UE information to the network side within a period of time before the RLF is detected in step 1, the UE initiates sending of the RRC message to the target cell that is successfully switched.

Preferably, the period of time is 1 second.

When the UE information is an IDC indication, step 5 may be described as: if the UE is configured to provide the IDC indication to the network side, and if the UE sends an RRC message (e.g., an indeccoxindication message) including the IDC indication information within a period of time before detecting the RLF, the UE initiates sending of the RRC message including the IDC indication information to the network side.

When the UE information is PPI, over-temperature assistance information, SPS assistance information, delay budget report, or maximum bandwidth selection indication, step 5 may be described as: if the UE is configured to provide the PPI, the overheating assistance information, the SPS assistance information, the delay budget report, or the maximum bandwidth selection indication to the network side, and if the UE sends an RRC message (e.g., UE assistance information uessistantanenceformation message) containing the PPI, the overheating assistance information, the SPS assistance information, the delay budget report, or the maximum bandwidth selection indication within a period of time before the RLF is detected, the UE initiates sending of the RRC message containing the corresponding UE information to the network side.

When the UE information is MBMS interest indication information, step 5 may be described as: if the primary cell broadcasts a system information block (such as SIB15) for MBMS, and if the UE has sent an RRC message (such as an MBMS service indication message) containing an MBMS interest indication within a period of time before detecting the RLF, the UE determines its MBMS frequency set and/or MBMS service set of interest, and initiates transmission of the RRC message containing the MBMS interest indication to the network side.

When the UE information is sidelink information, step 5 may be described as: if the primary cell broadcasts a system information block for sidelink communication or sidelink discovery or V2X sidelink communication (e.g. corresponding to SIB18, SIB19, SIB21, respectively), and if the UE transmits an RRC message for sidelink UE information (e.g. sidelink UE information message) indicating that its sidelink communication or sidelink discovery or V2X sidelink communication has changed with respect to parameters associated with the primary cell within a period of time before RLF is detected, the UE initiates transmission of the RRC message including the sidelink UE information to the network side.

Optionally, in this embodiment, the period of time before the RLF is detected may also be a period of time before an RRC message for indicating an MCG failure is sent or may be a period of time before an MCG failure indication procedure is triggered.

Optionally, in step 5, the condition that the UE determines to initiate UE information reporting further includes that, if the UE sends an RRC message for indicating MCG failure information to the network side before receiving the handover command. Or said handover command is for responding to said RRC message indicating MCG failure information; or may be stated as the UE initiating a fast MCG failure recovery procedure for indicating MCG failure information before receiving the handover command. And when the condition is met, the UE executes the step 5, otherwise, the UE determines that the RRC message for reporting the UE information is sent to the network side within a period of time before the switching command is received in the step 3, and the UE initiates the sending of the RRC message to the target cell which is successfully switched.

Fig. 4 is a block diagram of a schematic structure of a user equipment UE according to the present disclosure. As shown in fig. 4, the user equipment UE400 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, among others. The memory 402 has stored thereon program instructions. The instructions, when executed by the processor 401, may perform the above-described method performed by the user equipment as detailed in the present disclosure.

In the present disclosure, some of the different embodiments may work in conjunction with each other.

In the present disclosure, a "base station" refers to a mobile communication data and control switching center having a large transmission power and a wide coverage area, and includes functions of resource allocation scheduling, data reception and transmission, and the like. "user equipment" is

The mobile terminal of the user includes, for example, a mobile phone, a notebook, and other terminal equipment capable of performing wireless communication with a base station or a micro base station.

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 method for reporting information executed by User Equipment (UE) is a UE information reporting method for a conditional switch process, which is realized on the UE and comprises the following steps:

a condition switching monitoring and executing step, wherein the UE receives a condition switching command containing a switching executing condition, stores a condition switching configuration, detects whether the switching executing condition is met or not based on the configuration of the switching executing condition, and if the switching executing condition is met, the UE executes the switching to a corresponding condition switching target cell according to the stored condition switching configuration;

a step of completing the conditional switch, wherein the UE successfully completes the conditional switch;

and an information reporting step, wherein if UE configures UE information reporting and if the UE sends the UE information reporting message within a period of time before a switching execution condition corresponding to the condition switching process is met, the UE initiates sending of the UE information reporting message to a target cell.

2. The information reporting method performed by a user equipment according to claim 1,

the successfully completing conditional switch comprises one or more of:

submitting a response message for responding to the handover command to the target cell for handover to the lower layer to transmit the message;

successfully sending a response message for responding to the handover command to the target cell for handover;

the media access control MAC layer successfully completes the random access process for accessing the target cell;

when the random access channel RACH is configured to be skipped, the MAC layer indicates that the physical downlink control channel PDCCH scrambled by the radio network temporary identity RNTI of the UE is successfully received.

3. The information reporting method performed by a user equipment according to claim 1 or 2,

the switching execution condition corresponding to the conditional switching process comprises one or more of the following conditions before the switching execution condition is met:

before the switching condition corresponding to a target cell in the stored conditional switching configuration is met;

before the UE executes the switching to a target cell according to the stored conditional switching configuration;

before the UE accesses a conditional switch target cell.

4. The information reporting method performed by a user equipment according to claim 1 or 2,

the condition executed in the information reporting step further includes: the UE is configured with conditional handover, i.e. there is a stored conditional handover configuration on the UE.

5. The information reporting method performed by a user equipment according to claim 1 or 2,

when the UE information is an IDC indication, if the UE is configured to provide the IDC indication for the network side and if the UE sends a Radio Resource Control (RRC) message containing the IDC indication information within a period of time before a switching execution condition corresponding to the condition switching process is met, the UE sends the RRC message containing the IDC indication information to a target cell;

when the UE information is a power selection indication PPI, overheating assistance information, semi-persistent scheduling SPS assistance information, a delay budget report, or a maximum bandwidth selection indication, if the UE is configured to provide the PPI, the overheating assistance information, the SPS assistance information, the delay budget report, or the maximum bandwidth selection indication to a network side, and if the UE sends an RRC message including the PPI, the overheating assistance information, the SPS assistance information, the delay budget report, or the maximum bandwidth selection indication within a period of time before a handover execution condition corresponding to the conditional handover process is satisfied, the UE initiates sending of an RRC message including corresponding UE information to a target cell;

when the UE information is Multimedia Broadcast Multicast Service (MBMS) interest indication information, if a main cell broadcasts a system information block for MBMS and if the UE sends an RRC message containing the MBMS interest indication within a period of time before a switching execution condition corresponding to the condition switching process is met, the UE determines an interested MBMS frequency set and/or an interested MBMS service set and initiates the RRC message containing the MBMS interest indication;

when the UE information is edge communication sidelink information, if the primary cell broadcasts a system information block for sidelink communication, sidelink discovery, or vehicle networking V2X sidelink communication, and if the UE sends an RRC message of sidelink UE information indicating that a parameter associated with the target primary cell related to the sidelink communication, the sidelink discovery, or the V2X sidelink communication is changed within a period of time before a handover execution condition corresponding to the conditional handover process is satisfied, the UE initiates sending of an RRC message including the sidelink UE information to the target cell.

6. A method for reporting information executed by User Equipment (UE) is a UE information reporting method which is realized on the UE and used in the RRC connection recovery process after Radio Link Failure (RLF), and comprises the following steps:

a radio link monitoring step, in which the UE monitors that radio link failure RLF occurs;

a step of wireless link recovery, in which if the UE is configured with a rapid master cell group MCG link failure recovery mechanism, the UE initiates an MCG failure indication process, wherein the process comprises generating an RRC message for indicating MCG failure and delivering the RRC message to a lower layer to send the message;

and an information reporting step, wherein if the UE sends an RRC message for reporting the UE information to the network side within a period of time before the RLF is detected, the UE initiates the sending of the RRC message to the network side.

7. The information reporting method performed by a user equipment according to claim 6,

the RRC message for indicating MCG failure includes an MCG link failure indication, an MCG link failure reason, and a measurement result, and is used to inform the network side that RLF of MCG occurs.

8. The information reporting method performed by a user equipment according to claim 6 or 7,

when the UE information is IDC indication, if the UE is configured to provide IDC indication for the network side, and if the UE sends an RRC message containing the IDC indication information within a period of time before the RLF is detected, the UE initiates sending of the RRC message containing the IDC indication information to the network side;

when the UE information is PPI, overheating assistance information, SPS assistance information, a delay budget report or a maximum bandwidth selection indication, if the UE is configured to provide the PPI, the overheating assistance information, the SPS assistance information, the delay budget report or the maximum bandwidth selection indication to the network side, and if the UE sends an RRC message containing the PPI, the overheating assistance information, the SPS assistance information, the delay budget report or the maximum bandwidth selection indication within a period of time before the RLF is detected, the UE initiates sending of the RRC message containing the corresponding UE information to the network side;

when the UE information is MBMS interest indication information, if a main cell broadcasts a system information block for MBMS and if the UE sends an RRC message containing the MBMS interest indication in a period of time before the RLF is detected, the UE determines an interested MBMS frequency set and/or an interested MBMS service set and sends the RRC message containing the MBMS interest indication to a network side;

when the UE information is sidelink information, if the primary cell broadcasts a system information block for sidelink communication, sidelink discovery, or V2X sidelink communication, and if the UE sends an RRC message indicating that parameters related to the primary cell for sidelink communication, sidelink discovery, or V2X sidelink communication are changed within a period of time before RLF is detected, the UE initiates sending of the RRC message including the sidelink UE information to the network side.

9. The information reporting method performed by a user equipment according to claim 6 or 7,

the period of time before the detection of the RLF is a period of time before an RRC message for indicating an MCG failure is transmitted or a period of time before an MCG failure indication procedure is triggered.

10. A user equipment, comprising:

a processor; and

a memory having instructions stored thereon,

the instructions, when executed by the processor, cause the user equipment to perform the method of any of claims 1-9.