Batch Positioning Reports Across SFN Rollover Boundaries
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Solution Overview
Problem
Existing wireless communication systems, particularly in the context of 5G, face challenges in efficiently handling system frame number (SFN) rollovers during positioning measurements, leading to inaccuracies and inefficiencies in measurement reporting.
Innovation Solution
A method and apparatus for user equipment (UE) to perform positioning measurements across multiple SFN rollovers, transmitting measurement reports with timestamp information elements indicating SFN rollover, and a final report post-rollover, enhancing measurement accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If positioning measurements are performed across SFN rollover boundaries, then measurement coverage and accuracy are improved, but measurement reporting complexity increases
Solution Approach 1:
The measurement report is divided into multiple segments: a first measurement report containing measurements before the SFN rollover and a second measurement report containing measurements after the SFN rollover. This segmentation allows the UE to manage the complexity of reporting across rollover boundaries by dividing the data into manageable portions, each associated with a specific time window and SFN range.
Solution Approach 2:
The UE includes timestamp information elements in the measurement reports that indicate the SFN rollover event. This preliminary indication allows the location server to prepare for and correctly process the measurement data across the rollover boundary, avoiding the need for complex real-time processing and ensuring accurate positioning calculations.
2Reliability
If multiple measurement reports are transmitted across SFN rollover, then measurement completeness is improved, but transmission time and efficiency deteriorate
Solution Approach 1:
The measurement reports are segmented into multiple transmissions: an initial report containing pre-rollover measurements and a subsequent final report containing post-rollover measurements. This segmentation ensures completeness by capturing all measurements across the rollover event while allowing the UE to transmit data in manageable batches rather than requiring a single large transmission.
Solution Approach 2:
The measurement reporting process continues uninterrupted across the SFN rollover boundary. The UE maintains continuous measurement collection and reporting functionality, ensuring that the positioning measurement process remains continuous and complete despite the SFN reset event, thereby avoiding time loss while maintaining reliability.
Data Source
AI summary
Disclosed are techniques for wireless positioning. In an aspect, a user equipment (UE) performs a plurality of positioning measurements of a corresponding plurality of positioning reference signal (PRS) resources within a measurement window, wherein the measurement window spans at least one system frame number (SFN) rollover, and transmits, to a location server, at least one measurement report associated with the measurement window, the at least one measurement report including a plurality of timestamp information elements corresponding to the plurality of positioning measurements, wherein at least one timestamp information element of the plurality of timestamp information elements indicates the at least one SFN rollover.