Beam-Aware Handover Measurement Logging for 5G Mobility
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Solution Overview
Problem
Existing mobility management systems in 5G-NR networks face challenges in optimizing handover procedures for user equipment with varying mobility speeds, leading to issues such as too late, too early, or incorrect handovers, particularly in beam-based scenarios where identifying responsible beams for parameter adjustments is uncertain.
Innovation Solution
Implementing a beam-specific Mobility Robustness Optimization (MRO) approach that involves logging serving beam information by user equipment and reporting it to the network upon radio failure, allowing the network to adjust beam-specific Cell Individual Offsets (CIO) and Time-to-Trigger (TTT) values based on the reported data to optimize handover parameters for different beam groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam-specific MRO with logging and reporting is implemented, then handover accuracy is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent implements preliminary logging of serving beam information before handover failures occur. The UE continuously logs beam identity, quality metrics, and handover-related parameters during normal operation, so that when a failure occurs, the network already has pre-collected data for immediate analysis and parameter adjustment, eliminating the need for complex real-time data collection mechanisms.
Solution Approach 2:
The patent establishes a feedback loop where the network analyzes logged beam information after handover failures, identifies problematic beams, and adjusts beam-specific CIO and TTT parameters. This feedback mechanism enables continuous optimization of handover parameters based on actual failure patterns, improving accuracy while keeping the logging mechanism relatively simple by only recording essential failure-related data.
2Reliability
If beam-specific CIO and TTT adjustments are made, then mobility-related failures are reduced, but network configuration complexity increases
Solution Approach 1:
The patent segments the network configuration into beam-specific parameters rather than cell-wide parameters. Each beam can have its own CIO and TTT values, allowing the network to optimize handover behavior for individual beams that exhibit failure patterns. This segmentation enables targeted adjustments only where needed, rather than requiring complex global reconfiguration of entire cells.
Solution Approach 2:
The patent applies local quality by assigning different handover parameters (CIO and TTT) to different beams based on their specific performance characteristics. Beams with high failure rates receive customized parameter adjustments, while well-performing beams maintain default parameters. This localized approach reduces overall network configuration complexity by avoiding uniform changes across all beams.
3Speed
If handover parameters are optimized for high mobility, then fast moving terminals benefit, but slow moving terminals experience unnecessary handovers
Solution Approach 1:
The patent applies local quality by configuring different CIO and TTT parameters for different beams, which inherently serve different mobility patterns. Beams covering high-speed scenarios can have shorter TTT and larger CIO for earlier handover initiation, while beams in low-mobility areas use longer TTT and smaller CIO to prevent unnecessary handovers. This beam-specific parameterization resolves the contradiction by allowing simultaneous optimization for different mobility types in different spatial locations.
Data Source
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AI summary
There is provided an apparatus, a method and a computer program product. In accordance with an embodiment the method comprises measuring signals of one or more beams of a cell of a wireless communication network for handover; obtaining information of an identity of the one or more beams from the measured signals; storing the measurement results and the identity of the one or more beams; and sending the measurement results and the identity of the one or more beams to the wireless communication network when at least one predetermined condition is fulfilled.