DMRS-Based Frequency Spur Detection and Network Mitigation
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Solution Overview
Problem
Existing wireless communication systems struggle to effectively detect and mitigate dynamic frequency spurs, which can lead to performance degradation due to their varying nature over time, despite techniques for static spurs being available.
Innovation Solution
User equipment (UE) performs DMRS-based spur detection and estimation by filtering frequency-domain symbols to identify spurs, estimates their frequencies, and communicates this information to the network entity, which then adjusts the communication pattern to mitigate the spurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing techniques for static spur detection are used, then static frequency spurs can be mitigated, but dynamic frequency spurs cannot be effectively detected or mitigated due to their varying nature over time
Solution Approach 1:
The patent applies dynamics by transitioning from static spur detection to dynamic spur detection. The system continuously monitors frequency spurs over time and updates detection results to accommodate changing spur characteristics. This enables the system to adapt to dynamic spur patterns while maintaining reliable communication performance.
Solution Approach 2:
The patent implements feedback mechanisms where the UE reports detected spur information to the network entity, which then adjusts communication parameters accordingly. This closed-loop feedback system enables continuous adaptation to dynamic spur conditions, improving both detection capability and communication reliability.
2Reliability
If frequency spur detection and mitigation is implemented, then communication performance improves, but system complexity increases due to additional processing requirements
Solution Approach 1:
The patent segments the spur detection and mitigation process into distinct functional components: DMRS reception, filtering procedure, spur detection procedure, frequency estimation, and rate matching pattern application. This segmentation allows each component to be optimized independently, managing overall system complexity while improving communication performance.
Solution Approach 2:
The patent introduces an intermediary feedback mechanism where the UE communicates spur information to the network entity, which then adjusts transmission parameters. This intermediary coordination reduces the processing burden on individual components by distributing the complexity across the communication system.
3Measurement precision
If dynamic spur detection is performed continuously, then detection accuracy improves, but processing time and computational resources increase
Solution Approach 1:
The patent employs periodic spur detection rather than continuous detection. The system performs detection at specific intervals or triggered by certain conditions, maintaining sufficient accuracy for dynamic spur characterization while reducing processing time and computational resource consumption.
Solution Approach 2:
The patent uses preliminary actions by performing filtering procedures on DMRS symbols before spur detection to pre-process the signal and remove known channel characteristics. This preliminary processing simplifies subsequent spur detection, improving accuracy while reducing the time required for analysis.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a demodulation reference signal (DMRS) and perform a filtering procedure on frequency-domain symbols of the DMRS to obtain a frequency-domain noise signal associated with the frequency-domain symbols. The UE may perform a spur detection procedure on the frequency-domain noise signal to detect one or more frequency spurs associated with the frequency-domain symbols. In addition, the UE may estimate a frequency of the frequency spurs. In some implementations, the UE may transmit information indicating spur parameters associated with the frequency spurs (e.g., including the estimated frequency) to a network entity. The UE may receive a control message indicating a rate matching pattern for subsequent communications, the rate matching pattern based on the spur parameters. The UE and the network entity may communicate according to the rate matching pattern.