Dynamic Mode Switching for Inter-Modulation Distortion in 5G NR and LTE
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Solution Overview
Problem
Co-existence issues between 5G New Radio (NR) and LTE systems lead to inter-modulation distortion (IMD), degrading the performance of 'victim' operating bands when both technologies share or overlap in spectrum, particularly in early sub-6GHz deployments.
Innovation Solution
Implementing methods to determine inter-modulation distortion values between NR and LTE networks and dynamically switching between non-standalone (NSA) and standalone (SA) modes based on these values and quality of service requirements, including time division multiplexing and UE activity indication to manage co-existence effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If both NR and LTE systems are deployed in the same spectrum for early sub-6GHz deployments, then spectrum utilization is improved, but inter-modulation distortion degrades the performance of victim operating bands
Solution Approach 1:
The patent implements dynamic switching between NSA and SA modes based on real-time IMD measurements. The system transitions from a static co-existence configuration to a dynamic one where operational modes are adjusted according to measured distortion levels, allowing the system to adapt and mitigate IMD effects while maintaining spectrum utilization benefits
Solution Approach 2:
The patent establishes a feedback mechanism where IMD values are measured and used to trigger dynamic mode switching. The measured IMD information feeds back to the control mechanism, which then adjusts the operational mode (NSA/SA) to mitigate distortion effects, creating a closed-loop system that continuously optimizes co-existence performance
2Reliability
If dynamic switching between NSA and SA modes is implemented to mitigate IMD, then co-existence performance is improved, but system complexity increases
Solution Approach 1:
The patent changes the operational parameter (mode configuration) based on measured IMD values. By establishing a mapping between IMD thresholds and mode selections, the system transforms a complex multi-parameter optimization problem into a simpler threshold-based decision process, reducing implementation complexity while maintaining reliable co-existence performance
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. One method may inlcude a wireless communications device determining an inter-modulation distortion value between simultaneous communications on a first configuration of a first radio access network and a second configuration of a second radio access network, and dynamically switching between a non-standalone mode and a standalone mode of operation, based on the inter-modulation distortion value and a quality of service requirement for the standalone mode. The wireless communications device may also provide for time division multiplexing communications on a first RAT and a second RAT wherein only the first or second RAT is active during a period of time, and wherein the first RAT is an anchor for the second RAT.