CRS Interference Cancellation in Dynamic Spectrum Sharing
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing cell-specific reference signal (CRS) interference during dynamic spectrum sharing, leading to inefficiencies and increased overhead in LTE and NR communications.
Innovation Solution
A method and apparatus for a user equipment (UE) and base station to exchange interference indication and CRS assistance information, enabling CRS interference cancellation and mitigation based on location and sequence, allowing for dynamic spectrum sharing while optimizing CRS usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic spectrum sharing is implemented between LTE and NR systems, then spectrum utilization is improved, but CRS interference between systems increases
Solution Approach 1:
The patent converts the harmful CRS interference into a beneficial signal by using the interfering CRS from neighboring LTE cells as a reference for interference cancellation. The UE measures and identifies these CRS signals, then subtracts them from the received NR signal, transforming what was previously harmful interference into a useful component for improving signal quality and enabling successful spectrum sharing.
2Reliability
If CRS assistance information is exchanged between UE and base station, then interference cancellation capability is improved, but signaling overhead increases
Solution Approach 1:
The patent implements preliminary action by having the base station pre-configure CRS assistance information including neighboring cell IDs, CRS frequencies, and resource element locations before the UE needs to perform interference cancellation. This advance configuration allows the UE to efficiently identify and cancel CRS interference without requiring extensive real-time signaling, thereby reducing overhead while maintaining high interference cancellation capability.
Data Source
AI summary
The present disclosure relates to methods and devices for wireless communication including an apparatus, e.g., a UE and/or a base station. In one aspect, the apparatus may transmit an interference indication associated with DSS, the interference indication corresponding to a capability of a CRS interference cancellation. The apparatus may also receive CRS assistance information associated with the DSS, the CRS assistance information corresponding to one or more interfering cells. Additionally, the apparatus may determine at least one of a location or a sequence of at least one CRS, the at least one CRS corresponding to at least one of the one or more interfering cells. The apparatus may also mitigate interference from the at least one CRS corresponding to the at least one interfering cell, the interference being mitigated based on at least one of the location or the sequence of the at least one CRS.