Irregular Resource Element Mapping for Phase Noise Mitigation
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing phase noise and inter-carrier interference at high frequencies, particularly due to the impact of high subcarrier spacing on physical layer channel structure and signaling, which affects symbol length and increases overhead.
Innovation Solution
Implementing irregular resource element mapping by using low subcarrier spacing with network-based configuration, adjusting subcarrier density near the baseband direct current, splitting resource blocks into different sets with varying subcarrier offsets, and puncturing data subcarriers or using empty resource blocks near the DC to mitigate phase noise effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high subcarrier spacing is used to mitigate phase noise at high frequencies, then phase noise resistance is improved, but overhead increases and symbol length decreases
Solution Approach 1:
The patent applies different subcarrier spacing configurations to different frequency regions. Specifically, it uses a first subcarrier spacing for resource blocks near the DC subcarrier and a second (different) subcarrier spacing for resource blocks away from the DC subcarrier. This local differentiation allows optimization for phase noise mitigation in critical regions without uniformly increasing overhead across the entire bandwidth.
Solution Approach 2:
The patent segments the frequency spectrum into distinct regions based on proximity to the DC subcarrier. Resource blocks are divided into a first set (near DC) and a second set (away from DC), allowing independent subcarrier spacing configuration for each segment. This segmentation enables targeted phase noise management where it is most needed while preserving efficiency in other regions.
2Reliability
If high subcarrier spacing is used to mitigate phase noise, then phase noise resistance is improved, but physical layer channel structure and signaling complexity increase
Solution Approach 1:
The patent implements local quality by configuring different subcarrier spacing parameters for different frequency regions. The first subcarrier spacing applies to resource blocks near DC, while the second applies to resource blocks away from DC. This localized approach simplifies the overall physical layer structure compared to uniformly high subcarrier spacing, as it maintains standard configurations in non-critical regions.
Solution Approach 2:
The patent introduces dynamic flexibility by allowing the network to selectively configure subcarrier spacing based on operational conditions, frequency range, and service requirements. The system can adaptively choose between different subcarrier spacing configurations rather than being locked into a fixed high subcarrier spacing structure, thereby reducing signaling overhead and implementation complexity.
3Ease of manufacture
If uniform subcarrier spacing is used across all resource blocks, then implementation simplicity is maintained, but phase noise effects are not adequately mitigated near DC
Solution Approach 1:
The patent resolves this contradiction by applying local quality - using different subcarrier spacing configurations for different frequency regions. Resource blocks near the DC subcarrier use a first subcarrier spacing optimized for phase noise mitigation, while resource blocks away from DC use a second subcarrier spacing. This targeted approach maintains implementation feasibility while effectively addressing phase noise in the critical DC region.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for irregular resource element mapping. An apparatus (800) includes a transceiver (825) that is operable to communicate with a Radio Access Network (“RAN”). The apparatus (800) includes a processor (805) that receives (1005), via the transceiver (825), a resource element mapping configuration comprising an indication of an irregular subcarrier spacing for a plurality of subcarriers for the UE. The resource element mapping configuration may be defined by the RAN based on a carrier frequency. The processor (805) applies (1010) the indicated irregular subcarrier spacing to resource elements (“REs”) of the UE according to the resource element mapping configuration for communicating with the RAN.