NR-LTE Interference Control via CRS Pattern Segmentation
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Solution Overview
Problem
In a multi-cell environment, LTE and NR coexistence leads to significant interference for UE due to differing CRS patterns between neighboring LTE cells and the serving NR cell, limiting scheduling efficiency.
Innovation Solution
The method involves configuring multiple CRS pattern information sets for both the serving NR cell and neighboring LTE cells at the NR base station, which are then signaled to the NR UE. This allows the UE to perform interference cancellation by de-mapping PDSCH on specific REs based on the received CRS patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If scheduling is performed resource block by resource block in LTE-NR coexistence, then interference management becomes manageable, but scheduling efficiency is limited and cannot fully exploit available resources
Solution Approach 1:
The patent segments the resource elements into two distinct categories: CRS REs (where interference occurs) and non-CRS REs (where data can be transmitted without interference). This segmentation allows the system to apply different scheduling strategies to different resource elements, thereby improving overall scheduling efficiency while managing interference complexity through structured resource division.
Solution Approach 2:
The patent applies local quality by treating CRS REs and non-CRS REs differently. Specifically, data transmission is prohibited on CRS REs to avoid interference, while full scheduling flexibility is maintained on non-CRS REs. This localized differentiation optimizes resource utilization in interference-free regions while protecting against interference in CRS regions.
2Productivity
If PDSCH is transmitted on all allocated REs, then resource utilization is maximized, but interference from neighboring LTE cells increases due to CRS pattern differences
Solution Approach 1:
The patent extracts and identifies the specific REs that correspond to CRS patterns from the total allocated resource elements. By separating CRS REs from non-CRS REs, the system can exclude only the interfering portions from data transmission while maintaining utilization of all non-interfering REs, thus balancing resource utilization with interference avoidance.
Solution Approach 2:
The patent converts the harmful effect of CRS patterns into a beneficial scheduling constraint. By identifying CRS RE positions, the system transforms potential interference sources into known exclusion zones, enabling more precise and efficient resource allocation in the remaining non-CRS REs, thereby turning a limitation into an optimization opportunity.
3Device complexity
If CRS pattern configuration is simplified to one pattern per LTE carrier, then system complexity is reduced, but interference cancellation capability is insufficient in multi-cell environments
Solution Approach 1:
The patent introduces dynamic CRS pattern configuration by allowing multiple CRS patterns to be configured per LTE carrier, with each pattern associated with specific RE positions. The system can dynamically select and apply appropriate patterns based on the specific interference scenario, enabling adaptive interference cancellation that responds to varying multi-cell interference conditions while maintaining manageable complexity through structured pattern definitions.
Data Source
AI summary
The disclosure relates to a communication technique that converges a 5G communication system for supporting a higher data rate after a 4G system with IoT technology, and a system thereof. The disclosure may be applied to intelligent services (e.g., smart homes, smart buildings, smart cities, smart or connected cars, healthcare, digital education, retail, security and safety related services, etc.) based on 5G communication technology and IoT-related technology. In addition, the disclosure relates to a method and apparatus for performing communication in a wireless communication system composed of multiple cells.