Radar Interference Detection and Frequency Redirection in 5G NR-U
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Solution Overview
Problem
Current wireless systems operating in unlicensed spectrum, such as 5G NR-U, lack mechanisms to efficiently manage radar interference, particularly for idle or inactive devices, leading to potential transmission interruptions and regulatory compliance issues.
Innovation Solution
The implementation of methods and apparatus that detect radar interference and automatically switch wireless user devices to interference-free frequencies, utilizing paging signals and frequency redirection messages, even for devices in idle or inactive states, ensuring minimal transmission disruptions and regulatory compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless systems operate in unlicensed spectrum without radar interference management mechanisms, then spectrum utilization is maximized, but transmission interruptions and regulatory compliance issues occur
Solution Approach 1:
The system performs preliminary radar detection and frequency assessment before transmission begins. The base station identifies interference-free frequencies in advance and prepares frequency redirection messages, ensuring that when radar interference is detected, the system can immediately switch to a pre-identified alternative frequency without transmission interruptions.
Solution Approach 2:
The system continuously monitors the radio frequency spectrum for radar signals and dynamically adjusts transmission frequencies based on detected interference conditions. This feedback mechanism ensures that the wireless system adapts to changing spectrum conditions while maintaining continuous operation and regulatory compliance.
2Reliability
If radar interference detection and frequency switching mechanisms are implemented, then transmission continuity is maintained, but device complexity increases
Solution Approach 1:
The base station acts as an intermediary that centralizes radar detection and frequency management functions. Instead of requiring complex radar detection and frequency switching capabilities in each user device, the base station performs these functions centrally and instructs devices on frequency changes, thereby maintaining transmission continuity while minimizing individual device complexity.
Solution Approach 2:
The system implements autonomous radar detection and frequency selection without requiring manual intervention. The base station automatically monitors for radar signals, identifies alternative frequencies, and executes frequency redirection, enabling the system to self-manage interference conditions while maintaining simple device architectures.
3Reliability
If frequency switching is performed for idle or inactive devices, then regulatory compliance is ensured, but signaling overhead increases
Solution Approach 1:
The base station uses a universal paging signal structure that can convey both normal paging information and frequency redirection instructions. By embedding frequency change commands within existing paging signaling frameworks, the system ensures regulatory compliance for idle devices while minimizing additional signaling overhead and reusing existing communication channels.
Data Source
AI summary
Apparatus and methods for operating wireless devices using unlicensed frequency ranges with minimal transmission interruptions. In one embodiment, the apparatus and methods provide a mechanism for redirecting idle or inactive wireless devices to different frequencies in response to interference detection such as by 5 GHz-band radar. In one variant, the present disclosure provides methods and apparatus for allowing user device (UEs) using 5G NR-U spectrum to continue to operate upon radar detection by successfully switching the UEs to one or more frequencies that are free of radar operation. In one variant, a gNB controlling the UEs informs the AMF (access and mobility function) of a radar detection event, and the AMF initiates a paging towards idle UEs in order to allow the gNB to move the UEs to a frequency without radar operations. In another variant, a gNB switches its UEs to a different frequency without relying on the AMF.