Adapting Filter and Guard Band for Multi-Numerology Interference
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Solution Overview
Problem
The challenge in 5G wireless communication systems is managing interference between different numerologies, which arise due to varying subcarrier spacings, leading to suboptimal performance in diverse spectrum operations and interference issues in multi-numerology transmissions.
Innovation Solution
The system adapts filtering, beamforming, and guard band sizes based on specific requirements for each numerology to mitigate interference, allowing for optimized spectrum utilization and improved quality of service by selecting appropriate numerologies for each transmission scenario.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple subcarrier spacings are used to operate in diverse frequency ranges, then adaptability to different spectrum conditions is improved, but interference management complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting subcarrier spacing values (e.g., 15kHz, 30kHz, 60kHz) based on the operating frequency range and service requirements. This allows the system to adapt to different spectrum conditions (sub-6GHz vs. mmWave) while maintaining optimal performance through parameter optimization rather than structural complexity increase.
Solution Approach 2:
The system implements dynamics by enabling flexible switching between different numerologies (subcarrier spacing configurations) based on real-time channel conditions, frequency range, and service type. This dynamic adaptation allows the network to optimize performance across diverse deployment scenarios without requiring complex static interference management structures.
2Loss of time
If larger subcarrier spacing is used to reduce symbol length for URLLC, then latency is reduced, but spectral efficiency deteriorates
Solution Approach 1:
The patent applies local quality by assigning different subcarrier spacing values to different service types within the same network. URLLC traffic receives larger subcarrier spacing (e.g., 60kHz) for low latency, while MBB traffic uses smaller spacing (e.g., 15kHz or 30kHz) for high spectral efficiency. This localized optimization allows each service to operate with parameters tailored to its specific requirements.
Solution Approach 2:
The system segments the frequency spectrum into different numerology configurations based on service requirements. By dividing the available resources into separate numerology groups (e.g., numerology 0 for MBB, numerology 2 for URLLC), the network can simultaneously support both latency-sensitive and efficiency-sensitive applications without mutual interference.
3Object-affected harmful factors
If guard band size is increased to reduce inter-numerology interference, then interference mitigation is improved, but spectrum utilization deteriorates
Solution Approach 1:
The patent applies partial action by implementing selective guard band allocation rather than uniform protection across all numerology boundaries. Guard bands are inserted only where inter-numerology interference is detected or predicted to occur, based on factors such as adjacent numerology assignments and channel conditions. This partial protection approach reduces spectrum waste while maintaining adequate interference mitigation where needed.
Data Source
AI summary
Some embodiments include a method in a wireless transmitter for transmitting a first wireless signal according to a first numerology in a network capable of supporting two numerologies. The method comprises obtaining one or more requirements associated with each numerology; adapting at least one of a first filter property of the wireless transmitter, a first beamforming property of the wireless transmitter, and a guard band size between the first and second numerology based on the obtained one or more requirements; and transmitting the first wireless signal according to the first numerology. Particular embodiments may adapt one of a second filter property and/or a second beamforming property of the wireless transmitter, and transmit/receive a second wireless signal according to the second numerology. Further embodiments include a method in a wireless receiver corresponding to the embodiments in the wireless transmitter.