System and method for optimizing simultaneous condition reconfiguration of PCell and PSCell

Abstract

The present disclosure provides a system and method for optimizing simultaneous condition reconfiguration of a PCell and a PSCell. A method for optimizing simultaneous conditional reconfiguration of a primary cell (PCell) and a primary-secondary cell (PSCell) for a user equipment (UE) includes receiving a radio resource control (RRC) reconfiguration message from a base station, the RRC reconfiguration message including a conditional handover (CHO) command and a conditional PSCell add or change (CPAC) command for simultaneously performing reconfiguration of the PCell and reconfiguration of the PSCell, the CHO command comprises one or more first conditions for triggering the reconfiguration of the PCell, and wherein the CPAC command comprises one or more second conditions for triggering the reconfiguration of the PSCell; upon receiving the RRC reconfiguration message, storing one or more reports that capture one or more metrics related to simultaneous conditional reconfiguration of the PCell and the PSCell; and sending the one or more reports to the base station for optimizing the one or more first conditions and the one or more second conditions.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system. More specifically, the present disclosure relates to a system and method for optimizing simultaneous conditional reconfiguration of a primary cell (PCell) and a primary secondary cell (PSCell) for a user equipment (UE) in a wireless communication system. Background Art

[0002] In the 3rd Generation Partnership Project (3GPP) Release 16, as part of the New Radio (NR) Mobile Enhancement work item, the "Conditional Handover (CHO)" feature (referred to as "CHO") was introduced to enhance handover robustness and reduce handover failures in cell edge scenarios. The CHO feature is applicable to both Long Term Evolution (LTE) networks and NR networks. With the CHO feature, the network provides multiple candidate cells for handover to a user equipment (UE) connected to the network, and the user equipment (UE) then selects the best primary cell (PCell) for handover.

[0003] In 3GPP Release 17, "Conditional PSCell Change (CPC)" and "Conditional PSCell Addition (CPA)" were introduced. These features allow multiple candidate primary and secondary cells (PSCells) to be provided to the UE, which then selects the best PSCell. However, CHO and CPA / CPC cannot be configured at the same time, limiting the effectiveness of these features.

[0004] According to 3GPP Release 18, the network configures both CHO configuration details and CPA / CPC configuration details in the same conditional reconfiguration message sent to the UE. The UE can apply conditional reconfiguration only when both the CHO trigger condition and the CPA / CPC trigger condition are met. During the waiting period for both the target CHO cell and the target conditional PSCell addition and change (CPAC) cell to meet the criteria, different success and failure events may occur and occur at different times. During this process, the UE can record multiple SON / MDT parameters and share them with the network in the UEInformationResponse message.

[0005] Self-organizing networks (SON) were introduced in Long Term Evolution (LTE), which combine solutions for network self-configuration and self-optimization to support system deployment and performance optimization. Mobile robustness optimization (MRO) dynamically enhances handover (HO) performance, thereby improving user experience and increasing network capacity. Enhanced HO performance is achieved by automatically adjusting cell parameters based on performance indicators to refine handover boundaries. The purpose is to eliminate radio link failures (RLF) and reduce unnecessary handovers. Incorrect handover parameter settings may cause handover ping-pong, handover failures and RLF, which have a negative impact on user experience and waste network resources. Although handover failures (which do not cause RLF) are usually recoverable and not noticed by users, RLF (which is caused by incorrect HO parameter settings) affects both user experience and network resources. Therefore, the main goal of MRO is to minimize HO-related RLF. In addition, even if suboptimal HO parameter configurations do not cause RLF, these suboptimal HO parameter configurations may reduce service performance. For example, incorrect HO hysteresis settings may cause ping-pong or excessive delay in handover to the target cell. Therefore, a secondary purpose of MRO is to reduce inefficient network resource usage caused by unnecessary or missed handovers.

[0006] Minimization of Drive Testing (MDT) is a 3GPP mechanism that allows operators to collect mobile network field data (including radio measurements and location information) using user equipment (UE) in the network. MDT reduces the need for traditional drive testing, which is costly, time-consuming, and only provides a partial view of the network limited to the area accessible by the vehicle.

[0007] 3GPP-Release 16 has introduced the following CHO features:

[0008] 1) The UE receives a "ConditionalReconfiguration" with a list of CHO target cells and their associated HO triggering events.

[0009] 2) The UE performs an evaluation of the CHO target cell.

[0010] 3) The UE first performs conditional handover on a target cell that meets the triggering criteria.

[0011] Therefore, the SON-MDT report includes the following fields:

[0012] ·lastHO-Type: The CHO parameters for HO to a CHO target cell may be different from the normal HO parameters for the same target cell. Therefore, depending on whether the last HO was CHO or normal HO, the network uses this information to tune the CHO parameters or HO parameters accordingly.

[0013] timeBetweenEvents: This field is used to construct the timeline for dual event evaluation.

[0014] timeSinceCHO-Reconfig: The timer "timeSinceCHO-Reconfig" can be included in the RLF report in two cases. One case is when CHO execution occurs, timeSinceCHO-Reconfig indicates the time elapsed from receiving CHO configuration to CHO execution. The other case is when RLF occurs at the source link before CHO execution, TimeSinceCHO-Reconfig indicates the time elapsed from CHO configuration to RLF at the source link.

[0015] firstTriggeredEvent: If two execution conditions are configured, this field is used to indicate the first triggering event.

[0016] choCellId: This field is used to indicate the CHO cell selected after the first connection failure and before reestablishment.

[0017] choCandidate: This field indicates whether the associated cell is a candidate target cell for conditional handover.

[0018] 3GPP Release 17 introduces the following CPA / CPC features:

[0019] • Conditional PSCell Addition (CPA) is defined as a PSCell addition performed by the UE when (one or more) execution conditions are met.

[0020] • Conditional PSCell Change (CPC) is defined as a PSCell change performed by the UE when execution condition(s) are met.

[0021] • The UE starts evaluating the execution condition(s) upon receiving the CPA / CPC configuration and stops evaluating the execution condition(s) when a PSCell addition / change or PCell change is triggered.

[0022] ·CPA / CPC execution conditions can consist of one or two trigger conditions.

[0023] When the CPA / CPC procedure is successfully performed, the UE releases all stored conditional reconfigurations.

[0024] Therefore, the SON-MDT report includes the following fields:

[0025] · success PSCell-Report (SPR): This field is used to provide a successful PSCell change or addition report, wherein the successful PSCell change or addition report is triggered based on a successful change or addition report configuration.

[0026] choCandidate: This field is added in SPR in the same way as in SHR, with the same IE name and purpose, but a different container (successPSCell-Report) that carries it.

[0027] successSPSCell-config-r18: Same as SuccessHO-Config-r17, using percentage-based threshold variables.

[0028] firstTriggeredEvent, timeBetweenEvents: Within the scope of MRO for CPC and CPA, in case there are multiple events configured for CPA / CPC, it is beneficial if the UE reports: the type of the first triggered CPAC event and the duration between two triggered CPAC events.

[0029] timeSinceCPAC-Reconfig: This is similar to timeSinceCHO-Reconfig discussed for the CHO feature.

[0030] Therefore, various events and times associated with simultaneous CHO and CPAC need to be determined to be reported to the network for tuning and optimization. Summary of the invention

[0031] This summary is provided to introduce some features that are further described in the detailed description of the present disclosure in a simplified format. This summary is neither intended to identify the key or essential inventive concepts of the present disclosure nor to determine the scope of the present disclosure.

[0032] According to one aspect of the present disclosure, a method for optimizing simultaneous conditional reconfiguration of a primary cell (PCell) and a primary secondary cell (PSCell) for a user equipment (UE) includes: receiving a radio resource control (RRC) reconfiguration message from a base station, the RRC reconfiguration message including a conditional handover (CHO) command and a conditional PSCell addition or change (CPAC) command for simultaneously performing reconfiguration of the PCell and reconfiguration of the PSCell, wherein the CHO command includes one or more first conditions for triggering the reconfiguration of the PCell, and wherein the CPAC command includes one or more second conditions for triggering the reconfiguration of the PSCell; upon receiving the RRC reconfiguration message, storing one or more reports capturing one or more metrics related to the simultaneous conditional reconfiguration of the PCell and the PSCell; and sending the one or more reports to the base station for optimizing the one or more first conditions and the one or more second conditions.

[0033] According to one aspect of the present disclosure, an electronic device for optimizing simultaneous conditional reconfiguration of a primary cell (PCell) and a primary secondary cell (PSCell) for a user equipment (UE) includes: a memory; and a processor, operably coupled to the memory and configured to: receive a radio resource control (RRC) reconfiguration message from a base station, the RRC reconfiguration message having a conditional handover (CHO) command and a conditional PSCell addition or change (CPAC) command for simultaneously performing reconfiguration of the PCell and reconfiguration of the PSCell, wherein the CHO command includes one or more first conditions for triggering reconfiguration of the PCell, and wherein the CPAC command includes one or more second conditions for triggering reconfiguration of the PSCell; upon receiving the RRC reconfiguration message, store one or more reports capturing one or more metrics related to the simultaneous conditional reconfiguration of the PCell and the PSCell; and send the one or more reports to the base station for optimizing the one or more first conditions and the one or more second conditions.

[0034] In order to further illustrate the advantages and features of the present disclosure, a more specific description of the present disclosure will be presented by referring to the specific embodiments of the present disclosure shown in the accompanying drawings. It should be understood that these drawings only depict typical embodiments of the present disclosure and therefore should not be considered as limiting the scope of the present disclosure. The present disclosure will be described and explained with additional features and details in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] These and other features, aspects and advantages of the present disclosure will become better understood when the following detailed description is read with reference to the accompanying drawings, in which like characters refer to like parts throughout the several views, and in which:

[0036] Figure 1 An example of a wireless communication system supporting simultaneous conditional reconfiguration of an optimized primary cell (PCell) and a primary secondary cell (PSCell) according to an embodiment of the present disclosure is shown;

[0037] Figure 2 A flow chart depicting a method for optimizing simultaneous conditional reconfiguration of PCell and PSCell for a user equipment (UE) according to an embodiment of the present disclosure is shown;

[0038] Figures 3 to 11 shows a timing diagram associated with one or more metrics according to an embodiment of the present disclosure;

[0039] Fig.12 shows a signal flow diagram depicting a successful conditional switch according to an embodiment of the present disclosure;

[0040] Fig.13 A signal flow diagram depicting a source link failure between a UE and a base station according to an embodiment of the present disclosure is shown; and

[0041] Fig.14 A block diagram of a system for simultaneous conditional reconfiguration of a PCell and a PSCell of a UE according to an embodiment of the present disclosure is shown.

[0042] In addition, those skilled in the art will appreciate that the elements in the drawings are shown for simplicity and may not necessarily be drawn to scale. For example, the flow chart shows the method in terms of the most important operations involved to facilitate a better understanding of the various aspects of the present disclosure. In addition, one or more components of the device may have been represented in the drawings by conventional symbols in terms of the construction of the device, and the drawings may only show those specific details relevant to understanding the embodiments of the present disclosure to avoid obscuring the drawings with details that would be readily apparent to those of ordinary skill in the art having the benefit of the description herein. DETAILED DESCRIPTION

[0043] For the purpose of promoting an understanding of the principles of the present disclosure, reference will now be made to the embodiments shown in the drawings and specific language will be used to describe the embodiments shown. However, it should be understood that no limitation of the scope of the present disclosure is intended thereby, and changes and further modifications in the illustrated system and further applications of the principles of the present disclosure shown herein are considered to be within the ordinary scope of those skilled in the art to which the present disclosure relates.

[0044] Those skilled in the art will understand that both the foregoing general description and the following detailed description are illustrative of the present disclosure and are not intended to be limiting.

[0045] References throughout this specification to "on one hand," "on the other hand," or similar language mean that a particular feature, structure, or characteristic described in conjunction with an embodiment is included in at least one embodiment of the present disclosure. Thus, the phrases "in an embodiment," "in another embodiment," and similar language appearing throughout this specification may, but do not necessarily, all refer to the same embodiment.

[0046] The terms "includes", "comprising" or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process or method that includes a series of operations includes not only those operations but may also include other operations not expressly listed or inherent to such process or method. Similarly, one or more devices or subsystems or elements or structures or components introduced by "includes..." do not exclude the presence of other devices or other subsystems or other elements or other structures or other components or additional devices or additional subsystems or additional elements or additional structures or additional components without more restrictions.

[0047] The term "coupling" and its derivatives refer to any direct or indirect communication between two or more elements, whether or not these elements are in physical contact with each other. The terms "send", "receive" and "communication" and their derivatives cover both direct and indirect communication. The term "or" is an inclusive term meaning "and / or". The phrase "associated with..." and its derivatives refer to including, being included in, interconnected with, containing, being contained in, connected to or connected with, coupled to or coupled with, communicable with, collaborative with, interlaced, juxtaposed, close to, bound to or bound with, having, having the nature of, having a relationship with, etc. The term "controller" refers to any device, system or part thereof that controls at least one operation. The functions associated with any particular controller may be centralized or distributed, local or remote. When used with a list of items, the phrase "at least one of..." means that different combinations of one or more of the listed items may be used, and only one item in the list may be required. For example, "at least one of A, B, and C" includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C, and any variations thereof. As additional examples, the expression "at least one of a, b, or c" may refer to only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof. Similarly, the term "set" means one or more. Thus, a set of items may be a single item or a set of two or more items.

[0048] In addition, the multiple functions described below can be implemented or supported by one or more computer programs, each of which is formed by a computer-readable program code and implemented in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, processes, functions, objects, classes, instances, related data or a part thereof that are suitable for being implemented in a suitable computer-readable program code. The phrase "computer-readable program code" includes any type of computer code (including source code, object code and executable code). The phrase "computer-readable medium" includes any type of medium that can be accessed by a computer, such as a read-only memory (ROM), a random access memory (RAM), a hard drive, a compact disc (CD), a digital video disc (DVD) or any other type of memory. "Non-transitory" computer-readable media does not include wired, wireless, optical or other communication links that transmit temporary electrical signals or other signals. Non-transitory computer-readable media include media that can permanently store data and media that can store data and rewrite data later, such as rewritable optical discs or erasable memory devices.

[0049] Figure 1 An example of a wireless communication system that supports simultaneous conditional reconfiguration of optimized primary cells (PCells) and primary and secondary cells (PSCells) according to an embodiment of the present disclosure is shown. The wireless communication system 100 may include one or more base stations 105, one or more UEs 101, and a core network 103. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an improved LTE (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0050] One or more base stations 105 may be dispersed throughout a geographic area to form a wireless communication system 100, and may be devices of different forms or with different capabilities. One or more base stations 105 and one or more UEs 101 may communicate wirelessly via one or more communication links 107. Each base station 105 may provide a coverage area over which one or more UEs 101 and the base station 105 may establish one or more communication links 107. A coverage area may be an example of a geographic area over which one of the base stations 105 and one of the UEs 101 may support signal communication according to one or more radio access technologies. A coverage area may include a primary cell (PCell) to which one of the UEs 101 belonging to a primary cell group (MCG) is connected, and a primary secondary cell (PSCell) to which the same UE 101 belonging to a secondary cell group (SCG) may be connected.

[0051] One or more UEs 101 may be dispersed throughout the coverage area of ​​the wireless communication system 100, and each UE 101 may be fixed, mobile, or different forms of fixed or mobile at different times. One or more UEs 101 may be devices of different forms or with different capabilities.

[0052] One or more of the base stations 105 described herein may include or may be referred to by a person of ordinary skill in the art as a base station transceiver, a radio base station, an access point, a radio transceiver, a NodeB, an evolved NodeB (eNB), a next generation NodeB or gNodeB (any of which may be referred to as a gNB), a home NodeB, a home evolved NodeB, or other appropriate terminology.

[0053] One or more UE 101 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, a user device, or some other suitable term, where a "device" may also be referred to as a unit, a station, a terminal, or a client, as well as other examples. One or more UE 101 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, one or more UE 101 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, as well as other examples, which may be implemented in various objects (such as appliances, or vehicles, meters, and other examples).

[0054] One or more UEs 101 described herein are capable of communicating with various types of devices, such as other UEs 101 (which may sometimes act as relays), as well as base stations 105 and network equipment (including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples), such as Figure 1 shown.

[0055] Furthermore, it should be noted that although for illustrative purposes, Figure 1 Only two UEs 101 and two base stations 105 are depicted in FIG. 1 , but the wireless communication system 100 may include Figure 1 Additional UEs and base stations are not shown.

[0056] Figure 2 200 (operation) for optimizing the simultaneous conditional reconfiguration of PCell and PSCell for UE according to an embodiment of the present disclosure. Figure 1 right Figure 2 Explained.

[0057] like Figure 2As shown, at operation 201, the method 200 includes receiving a radio resource control (RRC) reconfiguration message from the base station 105, the RRC reconfiguration message having a conditional handover (CHO) command and a conditional PSCell addition or change (CPAC) command for simultaneous reconfiguration of the PCell and the PSCell. In an embodiment, the CHO command includes one or more first conditions for triggering the reconfiguration of the PCell, and the CPAC command includes one or more second conditions for triggering the reconfiguration of the PSCell. In an embodiment, the one or more first conditions and the second conditions may include an A3 event, an A5 event, and similar events. If there are multiple candidate PSCells associated with a candidate PCell, the base station 105 may provide multiple CHO configurations for the same candidate PCell, that is, each CHO configuration includes an MCG configuration (for the same candidate PCell) and an SCG configuration (for different candidate PSCells).

[0058] At operation 203, the method 200 includes storing one or more reports upon receiving the RRC reconfiguration message, the one or more reports capturing one or more metrics related to the simultaneous conditional reconfiguration of the PCell and the PSCell. In an embodiment, the UE 101 may determine whether one or more first conditions and second conditions are met, and may therefore store one or more reports capturing these events. Figures 3 to 11 Further explain one or more metrics.

[0059] At operation 205, method 200 includes sending one or more reports to a base station for optimizing the one or more first conditions and the one or more second conditions. Figures 3 to 11 The optimization of the one or more first conditional metrics and the second conditional metrics is further explained. In an embodiment, the UE 101 may send one or more reports to the base station 105 in a successPSCell-Report (SPR) / successful handover report (SHR). In another embodiment, the UE 101 may send one or more reports to the base station 105 in an RRC UE information response. In yet another embodiment, the UE 101 may send one or more reports to the base station 105 in a source link failure report.

[0060] Figures 3 to 11 1 shows a timing diagram associated with one or more metrics according to an embodiment of the present embodiment. In an embodiment, a report in the one or more reports includes a time metric indicating the time elapsed between satisfying one or more first conditions for executing a CHO command and satisfying one or more second conditions for executing a CPAC command, such as Figure 3 shown.

[0061] like Figure 3As shown, at time 301 (time stamp T1), UE 101 receives a configuration for executing a CHO command and a CPAC command simultaneously.

[0062] At time 303 (timestamp T2), one or more first conditions for executing a CHO command are met.

[0063] At time 305 (timestamp T3), one or more second conditions for executing the CPAC command are met. Then, UE 101 executes the CHO command and the CPAC command simultaneously. Therefore, the elapsed time can be calculated based on the difference between timestamp T3 and timestamp T2, that is:

[0064] Elapsed time = T3 - T2 (1)

[0065] This time metric may help the base station 105 optimize / tune the one or more second conditions so that the elapsed time may be minimized. In an embodiment, the base station 105 may optimize the one or more second conditions according to techniques known to those skilled in the art.

[0066] In an alternative embodiment, one of the one or more reports includes a time metric indicating the time that elapsed between satisfying the one or more second conditions for executing the CPAC command and satisfying the one or more first conditions for executing the CHO command, such as Figure 4 shown.

[0067] like Figure 4 As shown, at time 401 (time stamp T4), UE 101 receives a configuration for executing a CHO command and a CPAC command simultaneously.

[0068] At time 403 (timestamp T5), one or more second conditions for executing the CPAC command are met.

[0069] In addition, at time 405 (timestamp T6), one or more first conditions for executing the CHO command are met. Then, UE 101 executes the CHO command and the CPAC command simultaneously. Therefore, the elapsed time can be calculated based on the difference between timestamp T6 and timestamp T5, that is:

[0070] Elapsed time = T6 - T5 ... (2)

[0071] The time metric can help the base station 105 optimize / tune the one or more first conditions so that the time elapsed between satisfying the one or more first conditions and satisfying the one or more second conditions can be minimized. In an embodiment, the base station 105 can optimize the one or more first conditions according to techniques known to those skilled in the art.

[0072] In one embodiment, one of the one or more reports includes a time metric indicating the time that elapsed between satisfying one or more first conditions for executing the CHO command and detecting a source link failure between the UE 101 and the base station 105, such as Figure 5 shown.

[0073] like Figure 5 As shown, at time 501 (time stamp T1), UE 101 receives a configuration for executing a CHO command and a CPAC command simultaneously.

[0074] At time 503 (timestamp T2), one or more first conditions for executing a CHO command are met.

[0075] At time 505 (timestamp T7), a source link failure between UE 101 and base station 105 is detected.

[0076] In an embodiment, a source link failure may be detected using techniques known to those skilled in the art. In an embodiment, a source link refers to a link between a source cell and UE 101. A source cell refers to a cell connected to UE 101 before executing a CHO command and a CPAC command. A source link failure may include a radio link failure, an MCG link failure, and an SCG link failure. In an embodiment, a radio link failure may occur when the radio connection between UE 101 and base station 105 is lost. When a radio link failure is detected for an MCG, an MCG link failure is detected. Similarly, when a radio link failure is detected for an SCG, an SCG link failure is detected. Therefore, the elapsed time may be calculated based on the difference between timestamp T7 and timestamp T2, i.e.:

[0077] Elapsed time = T7-T2…(3)

[0078] The time metric can help the base station 105 reduce the trigger time (TTT) (i.e., the time for triggering CPAC configuration) or optimize one or more second conditions so that the one or more second conditions can be met before the source link failure occurs. In an embodiment, the base station 105 can optimize one or more second conditions or reduce TTT according to techniques known to those skilled in the art.

[0079] In an embodiment, one of the one or more reports includes a time metric indicating the time that elapsed between satisfying the one or more second conditions for executing the CPAC command and detecting a source link failure between the UE 101 and the base station 105, such as Figure 6 shown.

[0080] like Figure 6As shown, at time 601 (time stamp T4), UE 101 receives a configuration for executing a CHO command and a CPAC command simultaneously.

[0081] At time 603 (timestamp T5), one or more second conditions for executing the CPAC command are met.

[0082] At time 605 (timestamp T8), a source link failure between UE 101 and base station 105 is detected.

[0083] Therefore, the elapsed time can be calculated based on the difference between timestamp T8 and timestamp T5, namely:

[0084] Elapsed time = T8 - T5 ... (4)

[0085] The time metric can help the base station 105 reduce the trigger time (TTT) (i.e., the time for triggering the CHO configuration) or optimize one or more first conditions so that the one or more first conditions can be met before the source link failure occurs. In an embodiment, the base station 105 can optimize the one or more first conditions or reduce the TTT according to techniques known to those skilled in the art.

[0086] In one embodiment, one of the one or more reports includes a time metric indicating the time elapsed between a start CHO trigger time (TTT) event and detection of a source link failure between the UE 101 and the base station 105, such as Figure 7 shown.

[0087] like Figure 7 As shown, at time 701 (time stamp T1), UE 101 receives a configuration for executing a CHO command and a CPAC command simultaneously.

[0088] At time 703 (timestamp T9), a CHO trigger time TTT event begins. In an embodiment, the CHO TTT is a time period that needs to remain satisfied for one or more first conditions. Therefore, when the CHO TTT event expires, it is considered that the one or more first conditions are satisfied.

[0089] At time 705 (timestamp T8), while the CHO TTT is running, a source link failure between the UE 101 and the base station 105 is detected. Therefore, the evaluation of the conditional reconfiguration is stopped. In an embodiment, the source link failure may be detected using techniques known to those skilled in the art. Therefore, the elapsed time may be calculated based on the difference between timestamp T8 and timestamp T9, i.e.:

[0090] Elapsed time = T8-T9…(5)

[0091] This time metric may help base station 105 reduce CHO TTT according to techniques known to those skilled in the art.

[0092] In one embodiment, one of the one or more reports includes a time metric indicating the time elapsed between the start of a CPAC trigger time (TTT) event and the detection of a source link failure between the UE 101 and the base station 105, such as Figure 8 shown.

[0093] like Figure 8 As shown, at time 801 (time stamp T4), UE 101 receives a configuration for executing a CHO command and a CPAC command simultaneously.

[0094] At time 803 (timestamp T10), a CPAC TTT event is started. In an embodiment, the CPAC TTT is a time period that needs to remain satisfied for one or more second conditions. Therefore, when the CPAC TTT event expires, the one or more second conditions are considered to be satisfied.

[0095] At time 805 (timestamp T7), a source link failure between UE 101 and base station 105 is detected. Therefore, the evaluation of conditional reconfiguration is stopped. In an embodiment, a source link failure may be detected using techniques known to those skilled in the art. Therefore, the elapsed time may be calculated based on the difference between timestamp T7 and timestamp T10, i.e.:

[0096] Elapsed time = T7-T10...(6)

[0097] This time metric may help base station 105 reduce CPAC TTT according to techniques known to those skilled in the art.

[0098] In one embodiment, one of the one or more reports includes a time metric indicating the time elapsed between successful simultaneous execution of the CHO command and the CPAC command and detection of a target link failure between the UE 101 and the base station 105, such as Fig. 9 shown.

[0099] like Fig. 9 As shown, at time 901 (time stamp T11), UE 101 successfully executes the CHO command and the CPAC command simultaneously.

[0100] At time 903 (timestamp T7), a target link failure between UE 101 and base station 105 is detected.

[0101] Since the CHO command and the CPAC command have been successfully executed, the UE 101 is now connected to the target cell. In an embodiment, the target link refers to the link between the target cell and the UE 101. The target cell refers to the cell to which the UE 101 is connected after the CHO command and the CPAC command are successfully executed. In an embodiment, a target link failure may be detected using techniques known to those skilled in the art. Therefore, the elapsed time may be calculated based on the difference between the timestamp T7 and the timestamp T11, i.e.:

[0102] Elapsed time = T7-T11…(7)

[0103] The time metric may help the base station 105 optimize one or more of the first condition and the second condition according to techniques known to those skilled in the art.

[0104] In one embodiment, one of the one or more reports includes an evaluation status of one or more first conditions and one or more second conditions recorded before successfully executing the CHO command and the CPAC command simultaneously, such as Fig.10 Each evaluation status indicates success or failure of the corresponding first condition or second condition.

[0105] like Fig.10 As shown, at time 1001 (time stamp T1), UE 101 receives a configuration for executing a CHO command and a CPAC command simultaneously.

[0106] At time 1015 (time stamp T11), the CHO command and the CPAC command are successfully executed simultaneously.

[0107] In an embodiment, the evaluation status may be recorded a predefined number of times before successfully executing the CHO command and the CPAC command simultaneously. Fig.10 As shown, six evaluation states may be recorded, that is, six evaluation states are recorded between time 1003 and time 1013 .

[0108] In an embodiment, the predefined number of times may be configured by the UE 101 or the base station 105. In an embodiment, the report also includes the evaluation status of the one or more first conditions and the one or more second conditions and a timestamp corresponding to the time when the corresponding evaluation status was recorded. For example, at 1003, the report may include CHO ExecCondition passed at a timestamp T100.

[0109] At time 1005 (timestamp T101), the report may include CHO ExecConditionfailed. At time 1007 (timestamp T102), the report may include CPAC ExecConditionpassed. At time 1009 (timestamp T103), the report may include CPAC ExecConditionfailed. At time 1011 (timestamp T104), the report may include CHO ExecConditionpassed. At time 1013 (timestamp T105), the report may include CPAC ExecConditionpassed. Since both the first condition and the second condition have been met, at time 1015 (timestamp T11), the CHO command and the CPAC command are successfully executed. It should be noted that CHOExecCondition refers to the first condition and CPAC ExecCondition refers to the second condition.

[0110] The metric may help the base station 105 optimize one or more of the first condition and the second condition according to techniques known to those skilled in the art.

[0111] In one embodiment, a report in the one or more reports includes evaluation status of one or more first conditions and one or more second conditions recorded before the source link failure between UE 101 and base station 105 is detected, such as Fig.11 The evaluation status indicates success or failure of the corresponding first condition or second condition.

[0112] like Fig.11 As shown, at time 1101 (time stamp T1), UE 101 receives a configuration for executing a CHO command and a CPAC command simultaneously.

[0113] At time 1113 (timestamp T7), a source link failure is detected. In an embodiment, the evaluation status may be recorded a predefined number of times before a source link failure is detected between UE 101 and base station 105. For example, Fig.11 As shown, the evaluation status may be recorded five times, that is, the evaluation status may be recorded five times between time 1103 and time 1111. In an embodiment, the predefined number of times may be configured by UE 101 or base station 105. In an embodiment, the report further includes the evaluation status of one or more first conditions and one or more second conditions and a timestamp corresponding to the time when the corresponding evaluation status is recorded.

[0114] For example, at time 1103 (timestamp T200), the report may include CHO ExecCondition passed. At time 1105 (timestamp T201), the report may include CHO ExecCondition failed. At time 1107 (timestamp T202), the report may include CPAC ExecCondition passed. At time 1109 (timestamp T203), the report may include CPACExecCondition failed. At time 1111 (timestamp T204), the report may include CHO ExecCondition passed. At time 1113, a source link failure has been detected. It should be noted that CHO ExecCondition refers to the first condition and CPACExecCondition refers to the second condition.

[0115] The metric may help the base station 105 optimize one or more of the first condition and the second condition according to techniques known to those skilled in the art.

[0116] In an exemplary embodiment, UE 101 may send a message as described above with reference to base station 105 during operation (such as handover) between UE 101 and base station 105. Figures 1 to 11 One or more reports explained. Figure 12 to Figure 13 Such an example is discussed in . Fig.12 A signal flow diagram depicting a successful conditional switch according to an embodiment of the present disclosure is shown.

[0117] like Fig.12 As shown, at operation 1201, UE 101 and base station 105 are in a radio resource control (RRC) connection state.

[0118] At operation 1203 , the base station 105 sends an RRC UE capability query to the UE 101 .

[0119] At operation 1205, UE 101 transmits RRC UE capability information, in which UE 101 informs base station 105 that it supports successful handover reporting for CHO and CPAC.

[0120] At operation 1207 , the base station 105 transmits an RRC reconfiguration message including the setting of successHOConfig to the UE 101 .

[0121] At operation 1209 , UE 101 sends an RRC reconfiguration complete message to base station 105 .

[0122] At operation 1211, the RRC process continues to simultaneously receive the CHO configuration and the CPAC configuration, and the handover is successful.

[0123] At operation 1213, UE 101 stores one or more reports for CHO and CPAC in the SHR / SPR report, such as Figure 2 discussed.

[0124] At operation 1215 , the base station 105 sends an RRC reconfiguration message to the UE 101 .

[0125] At operation 1217 , the UE 101 transmits an RRC reconfiguration complete message including successHO-InfoAvailable to the base station 105 .

[0126] At operation 1219 , the base station 105 transmits an RRC UE Information Request including successHO-ReportReq / successPSCell-ReportReq being true to the UE 101 .

[0127] At operation 1221, UE 101 sends an RRC UE information response including one or more reports, such as Figure 2 discussed.

[0128] Fig.13 FIG. 8 is a signal flow diagram depicting a source link failure between a UE and a base station according to an embodiment of the present disclosure. Fig.13 As shown, operations 1301-1309 are similar to Fig.12 Therefore, for the sake of brevity, the same description will not be repeated here.

[0129] At operation 1311, the RRC process continues to simultaneously receive the CHO configuration and the CPAC configuration and detect a source link failure.

[0130] At operation 1313, UE 101 stores one or more reports for CHO and CPAC in the source link failure report, such as Figure 2 discussed.

[0131] At operation 1315 , the base station 105 transmits an RRC reconfiguration / reestablishment complete message including rlf-InfoAvailable to the UE 101 .

[0132] At operation 1317 , the base station 105 transmits an RRC UE Information Request including rlf-ReportReq being true to the UE 101 .

[0133] At operation 1319, UE 101 sends an RRC UE information response including one or more reports, such as Figure 2 discussed.

[0134] Fig.14 A block diagram of a system for simultaneous conditional reconfiguration of a PCell and a PSCell for a UE according to an embodiment of the present disclosure is shown.

[0135] Fig.14 The configuration of may be understood as a part of the configuration of the UE 101. In addition, the method 200 disclosed above may be implemented in a system 1400 according to another embodiment. Non-limiting examples of the system 1400 are electronic devices, mobile devices, user equipment, base stations or radio stations.

[0136] In an embodiment, system 1400 corresponds to UE 101. Fig.14 , the system 1400 may include a “processor” that is at least one processor 1401 , a communication circuit 1403 (eg, a communicator or communication interface), and a memory 1405 .

[0137] As an example, at least one processor 1401 may be a single processor or multiple processors, all of which may include multiple computing circuits. Processor 1401 may be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal processors, central processing units, state machines, logic circuits, and / or any device that manipulates signals based on operating instructions. In addition to other capabilities, processor 1401 is configured to obtain and execute computer-readable instructions and data stored in memory 1405. Processor 1401 may include one or more processors. At this point, one or more processors 1402 may be a general-purpose processor (such as a central processing unit (CPU), an application processor (AP), etc.), a pure graphics processing unit (such as a graphics processing unit (GPU)), a visual processing unit (VPU), and / or an AI-specific processor (such as a neural processing unit (NPU)). One or more processors 1402 may control the processing of input data according to predefined operating rules or artificial intelligence (AI) models stored in non-volatile memory and volatile memory (i.e., memory 1405). Predefined operating rules or AI models are provided by training or learning.

[0138] The communication circuit 1403 may perform functions for sending and receiving signals via a wireless channel. In one embodiment, the communication circuit 1403 may receive an RRC reconfiguration message from the base station 105 according to the techniques disclosed in the present disclosure. In another embodiment, the communication circuit 1403 may also send one or more reports to the base station 105 according to the techniques disclosed in the present disclosure. In another embodiment, the at least one processor 1401 may perform, via the communication circuit 1403, Figure 2 Operation 201 and operation 205.

[0139] The memory 1405 may include any non-transitory computer-readable medium known in the art, including, for example, volatile memory (such as static random access memory (SRAM) and dynamic random access memory (DRAM)) and / or non-volatile memory (such as read-only memory (ROM), erasable programmable ROM, flash memory, hard disk, optical disk, and tape). The memory 1405 may also store one or more reports according to the techniques disclosed in this disclosure.

[0140] The embodiments are exemplary in nature, and system 1400 may include additional components as may be necessary to implement the desired functionality of system 1400 in accordance with the requirements of the present disclosure.

[0141] Accordingly, the present disclosure provides techniques for improving simultaneous conditional reconfiguration of PCell and PSCell based on feedback reports from UE 101 .

[0142] Therefore, the present disclosure provides various advantages. For example, the present disclosure provides a technique for optimizing the triggering conditions (i.e., one or more first conditions and second conditions) for CHO and CPAC reconfiguration. Therefore, the present disclosure provides a technique for optimizing the simultaneous conditional reconfiguration of PCell and PSCell.

[0143] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs.The systems, methods, and examples provided herein are illustrative only and not limiting.

[0144] Benefits, other advantages, and solutions to problems have been described above with respect to specific embodiments. However, these benefits, advantages, solutions to problems, and any components that may cause any benefit, advantage, or solution to occur or become more obvious should not be construed as critical, required, or essential features or components of any or all claims.

[0145] Although specific language has been used to describe this subject, it is not intended to create any limitation therefrom. It will be apparent to those skilled in the art that various work modifications may be made to the method to realize the inventive concept taught herein. The accompanying drawings and the foregoing description provide examples of embodiments. It will be appreciated by those skilled in the art that one or more of the described elements may be combined into a single functional element completely. Alternatively, some elements may be divided into a plurality of functional elements. Elements from one embodiment may be added to another embodiment.

Claims

1. A method for optimizing simultaneous conditional reconfiguration of a primary cell PCell and a primary and secondary cell PSCell for a user equipment UE, the method comprising: receiving a radio resource control RRC reconfiguration message from a base station, the RRC reconfiguration message including a conditional handover CHO command and a conditional PSCell addition or change CPAC command for simultaneously performing reconfiguration of the PCell and reconfiguration of the PSCell, The CHO command includes one or more first conditions for triggering the reconfiguration of the PCell, and The CPAC command includes one or more second conditions for triggering reconfiguration of the PSCell; upon receiving the RRC reconfiguration message, storing one or more reports capturing one or more metrics related to the simultaneous conditional reconfiguration of the PCell and the PSCell; and The one or more reports are sent to the base station for optimizing the one or more first conditions and the one or more second conditions.

2. The method according to claim 1, wherein: A report of the one or more reports includes a time metric indicating a time elapsed between satisfying the one or more first conditions for executing the CHO command and satisfying the one or more second conditions for executing the CPAC command, and The method further includes executing the CHO command and the CPAC command simultaneously.

3. The method according to claim 1, wherein: One of the one or more reports includes a time metric indicating a time that elapsed between satisfaction of the one or more second conditions for executing the CPAC command and satisfaction of the one or more first conditions for executing the CHO command.

4. The method according to claim 1, wherein: A report of the one or more reports comprises a time metric indicating a time elapsed between satisfying the one or more first conditions for executing the CHO command and detecting a source link failure between the UE and the base station.

5. The method according to claim 1, wherein: A report of the one or more reports includes a time metric indicating a time elapsed between satisfying the one or more second conditions for executing the CPAC command and detecting a source link failure between the UE and the base station.

6. The method according to claim 1, wherein: A report of the one or more reports includes a time metric indicating an elapsed time between successful concurrent execution of the CHO command and the CPAC command and detection of a target link failure between the UE and the base station.

7. The method according to claim 1, wherein: A report of the one or more reports includes a time metric indicating a time elapsed between starting a CHO trigger time TTT event and detecting a source link failure between the UE and the base station.

8. The method according to claim 1, wherein: A report of the one or more reports includes a time metric indicating an elapsed time between starting a CPAC triggering time TTT event and detecting a source link failure between the UE and the base station.

9. The method according to claim 1, wherein: A report of the one or more reports includes evaluation status of the one or more first conditions and the one or more second conditions recorded prior to successful concurrent execution of the CHO command and the CPAC command.

10. The method according to claim 9, wherein: Before successfully executing the CHO command and the CPAC command simultaneously, the evaluation status is recorded a predefined number of times.

11. The method according to claim 9, wherein: The one report includes the evaluation status of the one or more first conditions and the one or more second conditions and a timestamp corresponding to a time when the corresponding evaluation status is recorded.

12. The method according to claim 1, wherein: A report among the one or more reports includes evaluation status of the one or more first conditions and the one or more second conditions recorded before the source link failure between the UE and the base station is detected.

13. The method according to claim 12, wherein: Before detecting a source link failure between the UE and the base station, the evaluation status is recorded a predetermined number of times.

14. The method according to claim 12, wherein: The one report includes the evaluation status of the one or more first conditions and the one or more second conditions and a timestamp corresponding to a time when the corresponding evaluation status is recorded.

15. An electronic device for optimizing simultaneous conditional reconfiguration of a primary cell PCell and a primary secondary cell PSCell for a user equipment UE, the electronic device comprising: Memory; as well as a processor operably coupled to the memory and configured to: receiving a radio resource control RRC reconfiguration message from a base station, the RRC reconfiguration message having a conditional handover CHO command and a conditional PSCell addition or change CPAC command for simultaneously performing reconfiguration of the PCell and reconfiguration of the PSCell, The CHO command includes one or more first conditions for triggering the reconfiguration of the PCell, and The CPAC command includes one or more second conditions for triggering reconfiguration of the PSCell; upon receiving the RRC reconfiguration message, storing one or more reports capturing one or more metrics related to the simultaneous conditional reconfiguration of the PCell and the PSCell; and The one or more reports are sent to the base station for optimizing the one or more first conditions and the one or more second conditions.

16. The electronic device according to claim 15, wherein: A report of the one or more reports includes a time metric indicating a time elapsed between satisfying the one or more first conditions for executing the CHO command and satisfying the one or more second conditions for executing the CPAC command, and The processor is further configured to execute the CHO command and the CPAC command simultaneously.

17. The electronic device according to claim 15, wherein: A report of the one or more reports includes a time metric indicating a time elapsed between satisfying the one or more second conditions for executing the CPAC command and satisfying the one or more first conditions for executing the CHO command, and The processor is further configured to execute the CHO command and the CPAC command simultaneously.

18. The electronic device according to claim 15, wherein: A report in the one or more reports includes at least one of: a time metric indicative of a time elapsed between satisfying the one or more first conditions for executing the CHO command and detecting a source link failure between the UE and the base station; a time metric indicative of a time elapsed between satisfying the one or more second conditions for executing the CPAC command and detecting a source link failure between the UE and the base station; a time metric indicative of an elapsed time between successful simultaneous execution of the CHO command and the CPAC command and detection of a target link failure between the UE and the base station; a time metric indicating the time elapsed between starting a CHO trigger time TTT event and detecting a source link failure between the UE and the base station; or A time metric indicating the time elapsed between starting a CPAC trigger time TTT event and detecting a source link failure between the UE and the base station.

19. The electronic device according to claim 15, wherein: a report of the one or more reports including an evaluation status of the one or more first conditions and the one or more second conditions recorded prior to successfully executing the CHO command and the CPAC command simultaneously, wherein before successfully executing the CHO command and the CPAC command simultaneously, recording the evaluation status a predefined number of times, and The one report includes the evaluation status of the one or more first conditions and the one or more second conditions and a timestamp corresponding to the time when the corresponding evaluation status is recorded.

20. The electronic device according to claim 15, wherein: A report in the one or more reports includes evaluation statuses of the one or more first conditions and the one or more second conditions recorded before a source link failure between the UE and the base station is detected, wherein, before detecting a source link failure between the UE and the base station, recording the evaluation status a predetermined number of times, The one report includes the evaluation status of the one or more first conditions and the one or more second conditions and a timestamp corresponding to the time when the corresponding evaluation status is recorded.

Images