Uplink UE Positioning with Adaptive SRS Power and Spatial Filters
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Solution Overview
Problem
Existing wireless communication networks face challenges in accurately configuring sounding reference signals (SRS) for uplink positioning due to insufficient information on UE spatial filters and channel conditions, leading to issues like detectability and oversaturation when signals are transmitted to multiple TRPs.
Innovation Solution
The method involves the UE receiving beamformed signals from multiple TRPs using different spatial filters, analyzing channel conditions, and reporting these conditions along with filter information to the network, which then determines and instructs the UE on optimal SRS parameters and spatial relations to avoid oversaturation and improve positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits SRS with higher power to ensure detectability at multiple TRPs, then positioning reliability is improved, but TRP oversaturation occurs
Solution Approach 1:
The patent implements dynamic power control for SRS transmission by allowing the UE to adjust its transmit power level based on real-time channel conditions and TRP reception status. The network dynamically configures power control parameters including closed-loop power control coefficients and power adjustment steps, enabling the UE to modulate its transmission power to avoid TRP oversaturation while maintaining detectability for positioning
Solution Approach 2:
The patent changes multiple SRS transmission parameters including power spectral density, transmission power, and spatial filter characteristics to optimize the balance between detectability and oversaturation avoidance. The network configures different power spectral density values and power adjustment parameters for different SRS resource sets, allowing precise control over the transmitted signal characteristics
2Object-generated harmful factors
If the UE transmits SRS with lower power to avoid TRP oversaturation, then harmful factors are reduced, but positioning accuracy deteriorates
Solution Approach 1:
The patent employs dynamic power control mechanisms where the UE continuously adjusts its transmission power based on feedback from TRP reception status and channel conditions. This dynamic adjustment enables the system to operate at optimal power levels that maintain positioning accuracy while preventing TRP oversaturation
Solution Approach 2:
The patent implements feedback-based power control where the network monitors TRP reception status and provides feedback to the UE about appropriate power levels. The network configures power control parameters and receives measurement reports from the UE to determine optimal power settings that balance accuracy and avoid oversaturation
3Adaptability or versatility
If the network configures multiple SRS resource sets with different parameters, then adaptability to different channel conditions is improved, but device complexity increases
Solution Approach 1:
The patent segments the SRS configuration into multiple resource sets, each with specific power spectral density values and power control parameters tailored to different channel conditions and TRP combinations. This segmentation allows the network to select appropriate configurations for different positioning scenarios without requiring the UE to process all possible configurations simultaneously
Solution Approach 2:
The patent enables the UE to be configured with multiple SRS resource sets (up to 16 sets with up to 16 resources each) but allows the UE to report only the most suitable configurations and for the network to select from these partial results. This approach provides sufficient adaptability while reducing the processing burden on the UE
Data Source
AI summary
A method for operating a wireless communication network that supports a plurality of reference signals such as sounding reference signals as provided. The method comprises analyzing a channel condition between a UE and TRPs, providing a measurement report to the wireless communication network and determining parameters of an uplink RS based on the measurement report. The method further comprises receiving, with the user equipment, at least one instruction signal comprising information indicating the determined parameters of the uplink RS, and transmitting the uplink RS within the UE so as to allow determining uplink transmission links for a UE multi-TRP communication or a position of the UE in the wireless communication network based on an evaluation of transmittal of the instructed uplink RS.