UE Measurement Window Alignment for NTN Neighbor Cell Detection
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Solution Overview
Problem
In Non-terrestrial Networks (NTN), the large propagation delay difference between a user equipment (UE) and its serving and neighboring base stations/cells causes misalignment of measurement windows, preventing accurate determination of measurement assistance information.
Innovation Solution
The UE determines and transmits measurement assistance information to the serving BS to align or adjust measurement windows, or the serving BS receives this information from the UE or neighboring BSs to configure appropriate measurement windows, using methods such as offsetting or extending the measurement window, or exchanging information via inter-BS interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If measurement windows are configured based on serving BS timing in NTN, then the measurement window configuration is simple, but the measurement window becomes misaligned with neighboring cell signals due to large propagation delay difference
Solution Approach 1:
The patent changes the timing parameters of the measurement window by introducing an offset value that compensates for propagation delay differences. The measurement window is adjusted by adding this offset to align it with the neighboring cell's signal timing, thereby resolving the misalignment issue while maintaining configuration simplicity.
Solution Approach 2:
The patent applies preliminary action by pre-calculating the propagation delay difference between the serving BS and neighboring cells, and pre-determining the offset value before configuring the measurement window. This allows the measurement window to be properly aligned from the outset without requiring real-time adjustments.
2Ease of operation
If the UE uses the configured measurement window without adjustment, then the UE operation is simple, but the UE cannot accurately measure neighboring cells due to timing misalignment
Solution Approach 1:
The patent enables the UE to autonomously determine the offset value based on information provided by the network (such as satellite ephemeris data or timing advance values). The UE then self-adjusts its measurement window timing using this offset, maintaining operational simplicity while achieving accurate measurement alignment.
3Adaptability or versatility
If the measurement window is extended to cover all possible signal arrivals, then measurement coverage is improved, but time resources are wasted and measurement precision is reduced
Solution Approach 1:
The patent optimizes the measurement window parameters by precisely calculating the required offset value based on propagation delay differences. This allows the measurement window to be positioned exactly where needed rather than extending broadly, thereby improving time resource efficiency while maintaining adequate coverage for signal detection.
Data Source
AI summary
The present application relates to a method and an apparatus for determining measurement assistance information. One embodiment of the subject application provides a method performed by a User Equipment (UE), comprising: determining measurement assistance information, wherein the measurement assistance information is used for determining or adjusting one or more measurement windows for one or more neighboring Base Stations (BSs) or one or more neighboring cells; and transmitting the measurement assistance information to a serving BS of the UE; or adjusting the measurement window based on the measurement assistance information.