UE-Assisted Dynamic Rate Matching Patterns for Intra-Frequency Interference
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Solution Overview
Problem
In wireless communications systems with dynamic spectrum sharing, neighboring base stations using different radio access technologies cause significant intra-frequency interference, leading to reduced spectral efficiency without effective interference mitigation.
Innovation Solution
User equipment (UE) performs interference measurements for shared radio frequency spectrum resources, determining a dynamic rate matching pattern based on interference levels, and communicates this pattern to the base station to optimize downlink transmissions, thereby reducing interference and improving spectral utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic spectrum sharing is implemented with neighboring base stations using different radio access technologies, then spectrum utilization is improved, but intra-frequency interference increases
Solution Approach 1:
The patent segments the frequency spectrum into different resource blocks and applies different rate matching patterns to different segments. By dividing the spectrum into manageable units and applying targeted interference mitigation to each segment, the system can maintain high spectrum utilization while reducing intra-frequency interference in specific areas where different radio access technologies overlap.
Solution Approach 2:
The patent implements location-aware rate matching where the rate matching pattern is determined based on the specific geographic location and interference conditions. Different regions experience different interference levels, and the system adjusts the rate matching parameters locally to match the actual interference environment, thereby optimizing spectrum utilization in each location while mitigating interference where it occurs.
2Device complexity
If rate matching patterns are made static to simplify processing, then device complexity is reduced, but adaptability to changing interference conditions deteriorates
Solution Approach 1:
The patent employs dynamic rate matching patterns that can change over time based on measured interference conditions. The system periodically updates the rate matching pattern according to current interference measurements, allowing it to adapt to changing spectral environments. This dynamic approach balances processing complexity with adaptability by using predefined pattern structures that simplify processing while still enabling temporal adaptation.
Solution Approach 2:
The system implements a feedback mechanism where interference measurements are continuously monitored and used to adjust the rate matching pattern. The measured interference conditions feed back into the rate matching decision process, creating a closed-loop system that adapts to changing conditions. This feedback-driven approach enables the system to maintain low processing complexity through structured patterns while achieving high adaptability through continuous measurement and adjustment.
3Measurement precision
If interference measurements are performed at resource element level to improve precision, then measurement precision is improved, but processing complexity increases
Solution Approach 1:
The patent divides the resource block into smaller segments and performs interference measurements on representative samples within each segment rather than every single resource element. This segmented measurement approach maintains sufficient measurement precision for rate matching decisions while significantly reducing the total number of measurements required, thereby lowering processing complexity.
Solution Approach 2:
The system performs measurements at a finer granularity than strictly necessary for basic rate matching, measuring interference at the resource element level in critical regions while using coarser measurements in other areas. This partial high-precision approach ensures adequate measurement precision where it matters most while keeping overall processing complexity manageable through selective detailed measurement.
Data Source
AI summary
Methods, systems, and devices for dynamic rate matching patterns for spectrum sharing are described. In some examples, a user equipment (UE) may measure one or more interference levels associated with resources of a physical resource block (e.g., interference levels associated with respective subcarriers or other division in the frequency domain, with respective symbol durations or other division in the time domain, or a combination thereof), and determine a rate matching pattern based on the interference level measurements. In some examples, the rate matching pattern may include a pattern of resources for communications between the UE and a base station (e.g., for downlink communications). The UE may transmit an indication of the rate matching pattern to the base station, and the base station may schedule or transmit one or more subsequent downlink transmissions based at least in part on the indication of the rate matching pattern received from the UE.