Wireless Feedback Signal Transmission for UE Ranging Accuracy
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately measuring the distance between user equipment (UE) using multiple carriers due to transmission time delays and limited bandwidth, which affects the precision of UE positioning and RF signal latency measurement.
Innovation Solution
A method for transmitting a feedback signal by a reception UE that includes information about the time difference between FFT windows for receiving reference signals in different frequency domains, allowing for precise distance calculation and reduced signaling overhead by selecting one frequency domain and feeding back the time difference, thereby improving UE ranging accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple carriers are used for distance measurement, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the wideband signal into multiple separate carrier signals that can be transmitted and received independently. Each carrier carries reference signals for distance measurement, allowing the system to achieve wideband measurement precision through multiple narrowband carriers without requiring complex wideband signal processing hardware
Solution Approach 2:
The patent transitions from time-domain wideband signaling to frequency-domain multi-carrier signaling. By distributing measurement signals across multiple frequency domains (carriers) rather than using a single wideband time-domain signal, the system achieves equivalent measurement precision while reducing the complexity of signal transmission and reception hardware
2Measurement precision
If wideband signal transmission is used, then UE ranging accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent segments the wideband measurement signal into multiple narrowband carrier signals. Each carrier requires less transmission power individually, and the UE can measure distance using multiple carriers with lower peak power requirements, reducing overall energy consumption while maintaining measurement precision through frequency diversity
Solution Approach 2:
The patent changes the signal parameters from wideband frequency spectrum to multiple narrowband carriers. This parameter change allows the system to achieve equivalent ranging accuracy through multiple lower-power transmissions rather than a single high-power wideband transmission, thereby reducing energy consumption
3Measurement precision
If time difference information is fed back for each frequency domain, then measurement precision is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential time difference information between FFT windows from each frequency domain measurement. Instead of feeding back complete measurement data for each carrier, the system extracts and feeds back only the critical time difference parameter, reducing signaling overhead while maintaining the precision needed for accurate distance calculation
Solution Approach 2:
The patent uses partial action by selecting one frequency domain as a reference and only feeding back time difference information relative to that reference. This partial feedback approach maintains measurement precision for UE ranging while significantly reducing the amount of signaling overhead compared to feeding back complete time difference data for all frequency domains
Data Source
AI summary
An embodiment of the present disclosure proposes a method for transmitting a feedback signal by a reception terminal in a wireless communication system, the method comprising the steps of: receiving a first reference signal and a second reference signal from a transmission terminal by the reception terminal; and transmitting a feedback signal to the transmission terminal by the reception terminal on the basis of the first reference signal and the second reference signal.