LTE DFS Radar Detection via UE Signaling and eNB Coordination
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Solution Overview
Problem
Current LTE networks face inefficiencies and inaccuracies in detecting radar signals in the 5 GHz band, leading to potential disruptions due to delayed or missed radar detection, which is critical for compliance with Dynamic Frequency Selection (DFS) regulations.
Innovation Solution
Enhancements in signaling and communication protocols between User Equipment (UE) and evolved Node Bs (eNBs), including UE radar detection capabilities, enhanced measurement and reporting configurations, and X2 interface-based information sharing between eNBs, as well as Mobility Management Entity (MME) involvement, to promptly detect and respond to radar presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current radar detection solutions are used in LTE networks, then the network can operate in unlicensed spectrum, but radar detection is delayed or inaccurate causing unintended disruption
Solution Approach 1:
The patent segments the radar detection function across multiple entities: UE performs initial detection on unlicensed carriers, eNB performs centralized detection and coordination, and multiple UEs can detect different radar signals in their respective coverage areas. This segmentation enables more comprehensive and timely radar detection compared to a single centralized approach.
Solution Approach 2:
The patent implements preliminary radar detection by UEs before the eNB needs to make channel vacating decisions. UEs continuously monitor for radar signals and report detections to the eNB in advance, allowing the network to prepare for channel vacating before radar interference actually occurs, thus reducing detection delay.
2Reliability
If DFS is mandated for 5 GHz band operation, then regulatory compliance is achieved, but channel vacating must occur within 10 seconds of radar detection which requires extremely fast detection
Solution Approach 1:
UEs perform continuous preliminary radar detection and report to eNB before the 10-second deadline is approached. The eNB receives these advance reports and initiates channel vacating procedures proactively, ensuring compliance with the 10-second requirement while maintaining efficient network operation.
Solution Approach 2:
The patent establishes a feedback loop where UEs report radar detections to the eNB, which then coordinates channel vacating decisions. This feedback mechanism ensures that the eNB has real-time information about radar presence and can make timely decisions to meet DFS compliance requirements.
3Productivity
If current radar detection methods are used, then equipment can operate in unlicensed band, but detection is inefficient leading to missed radar signals
Solution Approach 1:
The patent divides the detection task among multiple UEs across different geographic locations, each monitoring their local environment. This distributed segmentation increases the overall detection coverage and efficiency, reducing the likelihood of missed radar signals compared to a single detection point.
Solution Approach 2:
The patent merges detection results from multiple UEs at the eNB, creating a comprehensive view of radar presence across the entire network coverage area. This combination of multiple detection perspectives improves both efficiency and reliability by cross-validating detections and covering blind spots of individual UEs.
Data Source
AI summary
Embodiments of an evolved Node B (eNB) and User Equipment (UE) for dynamic frequency selection are generally described herein. An eNB may include a transceiver to: receive an indication from a User Equipment (UE) indicating that the UE is capable of detecting radar, send instructions to the UE to detect radar on a channel of an unlicensed band, the instructions including a scheduling information element and a measurement information element, and receive a notification of radar on the channel of the unlicensed band from the UE. The eNB may include a processor to: determine whether the radar was previously detected by the eNB on the channel of the unlicensed band, and in response to determining that the radar was previously undetected, detect radar on the channel of the unlicensed band.