Bandwidth Group Guard Band Interference Mitigation 5G NR
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Solution Overview
Problem
In 5G New Radio (NR) wireless communication systems, existing technologies face challenges in efficiently managing bandwidth groups for channel estimation and interference reduction due to varying subcarrier spacings between neighboring scheduling entities, leading to inconsistent transmission parameters and interference issues.
Innovation Solution
The implementation of bandwidth groups (BWGs) with defined minimum bandwidth spans where transmission parameters remain constant, allowing for frequency division multiplexing and the use of guard bands to reduce interference between adjacent resource blocks, enabling effective channel estimation and interference suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency division multiplexing is used to transmit multiple numerologies simultaneously, then spectral efficiency is improved, but interference between adjacent resource blocks increases
Solution Approach 1:
A guard band is introduced as an intermediary element between adjacent bandwidth groups carrying different numerologies. This guard band acts as a buffer that prevents direct interference between resource blocks of different numerologies while allowing both to be transmitted simultaneously in the frequency domain, thus resolving the contradiction between spectral efficiency and interference reduction
2Reliability
If guard bands are introduced to reduce interference, then transmission reliability is improved, but bandwidth utilization decreases
Solution Approach 1:
Guard bands are applied locally and selectively only at the boundaries between bandwidth groups carrying different numerologies, rather than across the entire spectrum. This localized application ensures transmission reliability where interference occurs while minimizing the impact on overall bandwidth utilization by leaving other frequency resources fully available for data transmission
3Measurement precision
If bandwidth groups are defined for channel estimation, then channel estimation accuracy is improved, but system complexity increases
Solution Approach 1:
The available bandwidth is segmented into multiple bandwidth groups, where each group carries a single numerology and maintains constant transmission parameters across all resource blocks within the group. This segmentation enables accurate channel estimation within each group while the overall system complexity is managed through standardized group definitions and systematic resource allocation patterns
Data Source
AI summary
A method at a scheduling entity might include determining that interference is present from a neighboring scheduling entity, which implements a second subcarrier spacing that is different from a first subcarrier spacing of the scheduling entity. The scheduling entity might request the neighboring scheduling entity to negotiate a bandwidth group (BWG), where the BWG is a bandwidth occupied by downlink subcarriers within which a transmission parameter is maintained. The method might include negotiating a bandwidth of the bandwidth group and transmitting, if negotiating is successful, downlink data to a scheduled entity served by the scheduling entity according to the negotiated bandwidth. The transmission parameter might be a precoder, rank, modulation order, power inside each BWG, or numerology. The numerology might be scalable and might be a combination of subcarrier spacing and cyclic prefix (CP) overhead. The subcarrier spacing might be scaled while keeping constant the CP overhead as a percentage of a symbol duration.