Multi-Node Positioning Using RF-Shifted Signal Copies
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving high-accuracy and low-latency positioning, particularly in environments with high path-loss and blockage issues, and existing methods introduce synchronization errors and have high signaling overhead.
Innovation Solution
A method involving cooperation between a main Transmit-Receive Point (TRP) and helping nodes, where the helping nodes manipulate time-frequency-spatial properties of a sensing signal before transmission, using low-complexity RF operations, to create multiple copies of the signal without altering the original time or frequency reference points, enabling accurate positioning without synchronization errors and reducing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple TRPs transmit sensing signals for positioning, then positioning accuracy is improved, but synchronization error increases
Solution Approach 1:
The patent employs the copying principle by having multiple TRPs transmit copies of the same sensing signal. Each TRP receives the original sensing signal from the network and transmits its own copy to the UE. This allows multiple signals to be compared for positioning while maintaining a common time reference, thereby improving accuracy without introducing synchronization errors between different signal sources.
Solution Approach 2:
The patent introduces the network as an intermediary that generates and distributes the master sensing signal to multiple TRPs. This intermediary ensures that all TRPs use the same time reference and signal characteristics, eliminating synchronization errors while enabling accurate positioning through multi-TRP signal reception and comparison.
2Measurement precision
If multiple TRPs transmit sensing signals for positioning, then positioning accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent merges the sensing signal transmission function across multiple TRPs by having them all transmit copies of the same master signal. This consolidation reduces the total signaling overhead compared to each TRP generating and transmitting its own independent signal, while still enabling accurate positioning through the received signal comparisons.
Solution Approach 2:
The patent makes the sensing signal universal by using the same master signal for all TRPs. This multi-functional approach allows the single master signal to serve multiple TRPs simultaneously, reducing redundant signaling while maintaining positioning capability through the distributed copy transmission mechanism.
3Measurement precision
If helping nodes manipulate sensing signal for positioning, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by having helping nodes modify the sensing signal in the RF domain through predefined time and frequency shifts. These parameter modifications create distinguishable signal copies for positioning while using simple, low-complexity RF operations that do not require complex signal processing or change the original time and frequency references.
Solution Approach 2:
The patent replaces complex digital signal processing with simpler RF-domain operations. Instead of using complex baseband processing, the helping nodes use straightforward RF time-shifting and frequency-shifting operations to create signal copies, thereby reducing device complexity while maintaining positioning accuracy.
Data Source
AI summary
In general, aspects relate to cooperation between a main transmit-receive point (TRP) and some helping nodes. The helping nodes transmit a copy of the sensing signal after manipulating time-frequency-spatial properties of a received version of the sensing signal. That is, upon receiving, from the main TRP, the sensing signal, a helping node may alter the sensing signal, for example by delaying the sensing signal in time and shifting the sensing signal in frequency, before transmitting the altered sensing signal to a target UE or other sensing receiver.