OFDM Reference Signal Control for Delay-Doppler Sensing
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Solution Overview
Problem
Ambiguity in delay and Doppler frequency domains exists in conventional orthogonal frequency domain multiplexing (OFDM) systems due to varying reference signal patterns and sensing algorithms, affecting resource utilization and performance.
Innovation Solution
A joint sensing control method and user equipment for OFDM communication systems that adapt reference signal patterns and settings using layer-3, layer-2, and layer-1 control mechanisms, along with over-the-top protocols, to optimize resource use and performance by selecting appropriate algorithms and configurations based on receiver capabilities and requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional reference signal patterns are used in OFDM systems, then system compatibility is maintained, but sensing performance and resource efficiency deteriorate due to ambiguity in delay and Doppler frequency domains
Solution Approach 1:
The patent implements dynamic adaptation of reference signal patterns through multiple control layers. Layer-3 RRC messages enable semi-static configuration adaptation, while layer-2 MAC-CE messages provide faster dynamic adjustment. This multi-timescale dynamic control allows the system to optimize reference signal patterns for sensing performance while maintaining resource efficiency, resolving the contradiction between reliability and productivity.
Solution Approach 2:
The invention changes key parameters of reference signals including comb offset, cyclic shift, and time-domain positioning based on sensing requirements. By dynamically adjusting these parameters through capability reports and sensing control requests, the system achieves optimal sensing performance in delay and Doppler frequency domains while improving resource utilization efficiency.
2Measurement precision
If reference signal configuration is optimized for sensing performance, then sensing accuracy improves, but system complexity and control overhead increase
Solution Approach 1:
The patent segments the control mechanism into three distinct layers with specific functions: layer-3 RRC for semi-static capability configuration and basic parameter setting, layer-2 MAC-CE for dynamic pattern selection and adjustment, and layer-1 physical layer for real-time sensing feedback. This segmentation reduces overall system complexity by distributing control functions across layers rather than concentrating complexity in a single control mechanism.
Solution Approach 2:
The sensing terminal autonomously generates capability reports indicating its sensing capabilities and requirements. The network then automatically configures appropriate reference signal patterns based on these self-reported capabilities, reducing the need for complex manual configuration and simplifying the control mechanism while maintaining high sensing accuracy.
3Adaptability or versatility
If multiple reference signal patterns are configured for different sensing scenarios, then adaptability improves, but configuration complexity and signaling overhead increase
Solution Approach 1:
The patent designs reference signal patterns with multi-functionality to serve both communication and sensing purposes. The same reference signal structure is used for channel estimation in communication while simultaneously providing sensing measurements. This universality reduces the need for separate dedicated sensing signals, thereby reducing signaling overhead while maintaining adaptability across different sensing scenarios through parameter adjustments.
Data Source
AI summary
A joint sensing control method for an orthogonal frequency domain multiplexing (OFDM) communication system includes receiving, from a sensing terminal, a first message or a first set of initiation message; configuring at least a reference signal according to the first message or the first set of initiation message; transmitting the at least a reference signal to the sensing terminal; and adapting a plurality of settings of the at least a reference signal; wherein the first message includes a capability report and the first set of initiation message includes a capability report and a sensing control request.