Successful Handover Reporting for NR-U Mobility Classification
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Solution Overview
Problem
In wireless communication systems, particularly in NR-U, successful handover reports (SHRs) are often triggered by channel occupancy issues rather than mobility problems, leading to improper network actions, and there is a need to distinguish between these to enhance mobility robustness optimization (MRO).
Innovation Solution
The UE and RAN node are configured to store and transmit successful handover related information based on specific trigger conditions, including ratios of time and LBT failures, to generate accurate SHR reports, and adjust configurations accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE generates SHR based on current trigger conditions in NR-U system, then the network receives handover reports, but the SHR may be triggered by channel occupancy problems rather than mobility issues, leading to improper network actions
Solution Approach 1:
The patent segments the handover report triggering mechanism by introducing separate trigger conditions for mobility-related handover issues and channel occupancy-related handover issues. This allows the network to distinguish between the two types of problems and take appropriate actions for each, resolving the contradiction between receiving handover reports and avoiding improper network actions due to misclassification.
Solution Approach 2:
The patent introduces an intermediary classification mechanism that acts as a mediator between the handover execution and the network's response. By classifying the cause of handover failure into distinct categories (mobility vs. channel occupancy) before transmitting the report, the system enables the network to interpret the report correctly and take appropriate actions, thus preventing improper responses.
2Productivity
If the network performs MRO based on all received SHR reports, then the network optimizes handover parameters, but the optimization may be inaccurate due to inclusion of reports triggered by channel occupancy problems
Solution Approach 1:
The patent segments the MRO process by separating mobility-related handover reports from channel occupancy-related handover reports. This segmentation allows the network to perform MRO exclusively on reports that indicate actual mobility issues, thereby maintaining high optimization efficiency while ensuring measurement precision by excluding reports that do not reflect true mobility problems.
Solution Approach 2:
The patent implements a feedback mechanism where the UE provides classified information about the cause of handover failure in the SHR report. This feedback enables the network to adjust its MRO process dynamically, focusing computational resources on optimizing parameters for genuine mobility issues while ignoring reports caused by channel occupancy problems, thus achieving both high efficiency and precision.
3Loss of information
If the UE transmits detailed handover measurement information, then the network has more data for optimization, but the processing complexity and time increase
Solution Approach 1:
The patent extracts only the essential and relevant information needed for MRO from the complete set of handover measurement data. By identifying and transmitting only the critical parameters that directly impact handover optimization (such as classification of failure cause, key measurement values), the system reduces processing time and complexity while maintaining the completeness of information necessary for effective optimization.
Solution Approach 2:
The patent applies local quality by providing different levels of information detail based on the specific context and type of handover failure. Rather than uniformly transmitting all possible measurement data in every report, the system tailors the information content to the specific situation, including only the most relevant measurements for the particular type of failure being reported, thus optimizing the balance between information completeness and processing efficiency.
Data Source
AI summary
The present application relates to methods and apparatuses for enhancements on a successful handover report (SHR). One embodiment of the present disclosure provides a user equipment (UE), which includes: a transceiver; and a processor coupled with the transceiver and configured to: receive configuration associated with a handover procedure in an unlicensed spectrum, wherein the configuration indicates one or more trigger conditions associated with a successful handover report for the handover procedure that has been successfully completed; and store successful handover related information in the successful handover report in response to fulfillment of at least one of the one or more trigger conditions.