Adaptive Measurement Gap Sharing for Wireless Coverage Enhancement
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Solution Overview
Problem
In machine-type communication (MTC), existing measurement gaps are inefficiently shared between intra-frequency and inter-frequency measurements, leading to prolonged measurement times under enhanced coverage modes, which degrade mobility performance.
Innovation Solution
A method where user equipment (UE) adapts the percentage of measurement gaps based on its coverage enhancement level, allocating more gaps for intra-frequency measurements during enhanced coverage to maintain efficient measurement performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If measurement gaps are shared between intra-frequency and inter-frequency measurements, then inter-frequency measurements can be performed, but measurement times become prolonged under enhanced coverage modes
Solution Approach 1:
The patent applies dynamics by making the gap sharing configuration adaptive rather than fixed. The UE dynamically selects gap sharing configurations based on its coverage enhancement level, transitioning from static to dynamic resource allocation. This allows the system to optimize measurement time according to actual coverage conditions while maintaining measurement capability.
Solution Approach 2:
The patent changes the parameter of gap sharing percentage based on coverage enhancement level. Different coverage levels (CE Mode A and CE Mode B) are associated with different gap sharing configurations, where CE Mode B allocates a higher percentage of gaps to intra-frequency measurements. This parameter change resolves the contradiction by adjusting resource allocation according to operational conditions.
2Measurement precision
If more measurement gaps are allocated for intra-frequency measurements, then measurement performance is improved, but inter-frequency measurement opportunities are reduced
Solution Approach 1:
The patent applies local quality by providing different gap sharing percentages for different coverage levels. In CE Mode B (enhanced coverage), a higher percentage of gaps is allocated to intra-frequency measurements to ensure measurement performance. In CE Mode A (normal coverage), a lower percentage is allocated, allowing more inter-frequency measurements. This localized optimization resolves the contradiction by matching resource allocation to specific operational requirements.
Solution Approach 2:
The system dynamically adjusts the gap sharing percentage based on the UE's coverage enhancement level, allowing flexible optimization of measurement performance versus measurement coverage. This dynamic adaptation enables the system to prioritize intra-frequency measurements when needed while maintaining inter-frequency measurement capability when coverage enhancement is not active.
3Reliability
If coverage enhancement mode B is used, then coverage is improved, but measurement time increases due to longer measurement requirements
Solution Approach 1:
The patent changes the gap sharing parameter based on coverage enhancement level. When CE Mode B is activated to improve coverage in challenging environments, the system automatically adjusts to allocate a higher percentage of measurement gaps to intra-frequency measurements. This parameter change compensates for the longer measurement requirements by providing additional gap resources, thereby maintaining measurement performance while supporting enhanced coverage.
Solution Approach 2:
The patent establishes different gap sharing configurations as copies or variants of the standard gap sharing mechanism. By creating configuration-specific gap allocation rules for CE Mode A and CE Mode B, the system preserves the basic measurement functionality while adapting to different coverage conditions. This copying approach allows the system to maintain measurement performance across different operational modes.
Data Source
AI summary
According to certain embodiments, a method for use in a wireless device comprise determining a coverage level with respect to a serving cell, selecting one of a plurality of configurations for sharing gaps between intra- and inter-frequency measurements, and performing one or more measurements according to the selected configuration for sharing gaps. The configuration for sharing gaps is selected based at least in part on the determined coverage level. For example, certain embodiments use the determined coverage level to select one of a plurality of tables, wherein each table comprises one or more schemes that indicate how to share gaps between intra- and inter-frequency measurements.