SRS Configuration Across Cells for Low-Power 5G Positioning
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Solution Overview
Problem
Existing methods for low-power high accuracy positioning devices (LPHAP) in 5G NR cellular systems fail to maintain accurate SRS resource configurations during mobility, leading to battery life issues due to frequent reconfigurations and invalidation of SRS resource parameters.
Innovation Solution
Implementing a one-to-many spatial relation and power control configuration for SRS resources within a positioning validity area, allowing LPHAP devices to maintain SRS configurations during cell reselection without full reconfiguration, using common parameters across cells in the area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full SRS reconfiguration is performed during cell reselection, then positioning accuracy is maintained, but battery consumption increases due to frequent reconfigurations
Solution Approach 1:
The patent segments SRS configuration parameters into two categories: common parameters that remain valid across multiple cells within a positioning validity area, and cell-specific parameters that require reconfiguration. This segmentation allows the UE to maintain positioning functionality using common parameters during cell reselection without performing full reconfiguration, thereby reducing battery consumption while preserving positioning accuracy through selective use of cell-specific parameters when needed.
2Duration of action of moving object
If SRS configuration is maintained during mobility, then battery life is extended, but positioning accuracy may deteriorate due to device movement and rotation
Solution Approach 1:
The patent implements a dynamic approach where the UE monitors conditions (device movement, rotation, cell changes) and selectively updates only the necessary cell-specific SRS parameters while maintaining common parameters. This dynamic parameter management allows the system to extend battery life by avoiding unnecessary full reconfigurations while maintaining positioning accuracy through targeted updates when mobility conditions change.
3Measurement precision
If frequent SRS reconfigurations are performed to account for device movement, then positioning accuracy is maintained, but device complexity increases
Solution Approach 1:
The patent simplifies device complexity by segmenting configuration management into automated common parameter maintenance (no user intervention needed) and selective cell-specific parameter updates (triggered only by mobility conditions). This segmentation reduces the perceived complexity for the UE while maintaining positioning accuracy, as the majority of parameters remain static and require no frequent reconfiguration.
Data Source
AI summary
According to embodiments, a user equipment (UE) receives a sounding reference signal (SRS) configuration. The SRS configuration includes a first SRS configuration that is used by the UE in a radio resource control (RRC) connected state for SRS transmission and a second SRS configuration that is usable by the UE in an RRC inactive state for SRS transmission with a plurality of cells within a positioning validity area. The UE, while in the RRC connected state, performs a first SRS transmission with a first cell of the plurality of cells based on the first SRS configuration. The UE determines that the UE is in the RRC inactive state. The UE, while in the RRC inactive state, performs a second SRS transmission with one or more cells of the plurality of cells based on the second SRS configuration.