Multiple DL-PRS Search Windows for RSTD Uncertainty
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently measuring downlink positioning reference signals (DL-PRS) due to uncertainties in reference signal time difference (RSTD) and line of sight (LOS) and non-line of sight (NLOS) paths, which affect the accuracy and efficiency of positioning measurements.
Innovation Solution
Implementing multiple search windows, including a first and second search window, configured based on RSTD uncertainty and path type (LOS or NLOS), to enhance the measurement of DL-PRS resources, with configurations potentially transmitted via system information blocks (SIB) and updated based on UE capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single search window is used for DL-PRS measurement, then the device complexity is reduced, but the measurement precision deteriorates due to RSTD uncertainty and path type variations
Solution Approach 1:
The patent divides the search window into multiple segments (first search window for LOS paths, second search window for NLOS paths) to address different propagation conditions separately. This segmentation allows each window to be optimized for its specific path type, improving measurement precision while managing complexity through structured organization
Solution Approach 2:
The patent implements dynamic search window configuration where the network can configure different search windows based on detected path types (LOS or NLOS). The search window parameters (timing, frequency, power) are dynamically adjusted according to the identified propagation condition, enabling adaptive optimization of measurement precision
2Measurement precision
If multiple search windows are configured for different path types, then the measurement precision improves, but the loss of time increases due to extended search duration
Solution Approach 1:
By segmenting the search into multiple targeted windows rather than one comprehensive window, the patent reduces the total search time. Each segmented window focuses on a specific time range appropriate for its path type, eliminating the need to search the entire time span for both LOS and NLOS conditions simultaneously
Solution Approach 2:
The network performs preliminary detection of the dominant path type (LOS or NLOS) before configuring the search window. This preliminary action allows the system to pre-select the appropriate search window configuration, avoiding the time loss that would result from trying all possible path types sequentially
3Measurement precision
If search windows are configured based on RSTD uncertainty, then the measurement precision improves, but the device complexity increases due to additional configuration parameters
Solution Approach 1:
The patent changes key parameters of the search window (timing offset, duration, frequency position, power levels) based on the configured RSTD uncertainty values. By systematically adjusting these parameters according to uncertainty measurements, the system achieves precise RSTD measurements while managing configuration complexity through parameter-based adaptation rather than structural complexity
Data Source
AI summary
In an aspect, a network component (e.g., BS, LMF, etc.) determines a configuration of a first search window associated with a downlink positioning reference signal (DL-PRS) resource from a transmission reception point (TRP) to a user equipment (UE) and a second search window associated with the DL-PRS resource from the TRP to the UE. The network component transmits the configuration to the UE. The UE performs one or more positioning measurements of the DL-PRS resources based on the first and second search windows.