Paired Positioning Resource Windows for Sidelink Clock Drift
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately positioning user equipment (UE) in sidelink communications, particularly due to synchronization and clock drift issues, which affect the accuracy of positioning reference signals (PRS).
Innovation Solution
The proposed solution involves a method where a user equipment (UE) receives indications of positioning resources from a positioning resource pool, which includes paired positioning resource windows for transmitting positioning reference signals (PRS). This method allows for the reservation and transmission of PRS on specific positioning resources, minimizing the impact of clock drift and synchronization errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If positioning reference signals are transmitted in sidelink communications, then positioning capability is enabled, but clock drift and synchronization errors degrade positioning accuracy
Solution Approach 1:
The positioning resource pool is segmented into multiple positioning resource windows (first positioning resource window, second positioning resource window, third positioning resource window) with specific structures. Each window contains designated resources for PRS transmission and guard periods, allowing the system to break down the continuous transmission into manageable segments that can better handle synchronization challenges.
Solution Approach 2:
The patent establishes positioning resource pools and paired positioning resource windows in advance before actual positioning operations. The resource pool configuration, including the pairing of windows and allocation of guard periods, is pre-configured to proactively address synchronization and clock drift issues before they affect positioning accuracy.
2Reliability
If positioning resource pools are configured with multiple windows, then positioning reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The positioning resource pool is divided into multiple distinct positioning resource windows, each with specific functions. The first window contains PRS resources, the second window contains paired PRS resources, and the third window provides guard periods. This segmentation allows for systematic management of positioning resources while improving reliability through redundancy and structured allocation.
Solution Approach 2:
The patent combines multiple positioning resource windows into a unified positioning resource pool structure. By merging the first, second, and third positioning resource windows into a single resource pool, the system achieves improved positioning reliability while managing complexity through a unified configuration framework that handles all windows consistently.
3Measurement precision
If guard periods are allocated between positioning resource windows, then synchronization errors are mitigated, but available positioning resources are reduced
Solution Approach 1:
Guard periods are allocated between positioning resource windows as a preventive measure against synchronization errors and clock drift. These guard periods act as cushioning buffers that absorb timing variations and prevent error propagation, ensuring positioning precision is maintained even at the cost of some resource overhead.
Solution Approach 2:
The system adjusts the parameters of positioning resource windows, including the allocation of guard periods and the pairing of windows, to optimize the balance between positioning precision and resource availability. By carefully tuning window durations, guard period lengths, and resource allocations, the system achieves acceptable positioning accuracy while maximizing the use of available resources.
Data Source
AI summary
In an aspect, a user equipment (UE) may receive indications of positioning resources of a positioning resource pool, wherein the positioning resource pool includes a first positioning resource window having a first set of one or more contiguous positioning resources, a second positioning resource window having a second set of one or more contiguous positioning resources, and a third positioning resource window having a third set of one or more contiguous positioning resources extending between an end of the first positioning resource window and a start of the second positioning resource window. The UE may transmit a first positioning reference signal (PRS) on a first positioning resource reserved from the first positioning resource window. The UE may transmit a second PRS on a second positioning resource reserved from the second positioning resource window.