GSCN Disambiguation Using Differential Phase in NTN Cell Access
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Solution Overview
Problem
In non-terrestrial networks, the ambiguity in determining the correct global synchronization channel number (GSCN) due to frequency overlap and Doppler shift leads to reduced communication quality, reliability, and capacity, as incorrect GSCN assumption can hinder cell access and increase latency.
Innovation Solution
A user equipment (UE) measures reference signal phases, compares them with hypothetical phase sequences for conflicting GSCNs, and selects the correct GSCN based on differential phase value comparisons to resolve ambiguity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency resources for reference signal overlap with frequency ranges of multiple GSCNs, then the reference signal can be received, but GSCN determination becomes ambiguous
Solution Approach 1:
The patent introduces differential phase values as an intermediary measurement to resolve the ambiguity between overlapping GSCN frequency ranges. By comparing differential phase values derived from reference signals at different frequencies, the system can identify the correct GSCN without direct frequency measurement, thus resolving the contradiction between reliable signal reception and accurate GSCN determination
Solution Approach 2:
The patent changes the measurement parameter from direct frequency measurement to differential phase value comparison. This parameter transformation allows the system to distinguish between overlapping GSCN frequencies by measuring phase differences across multiple reference signals, thereby improving GSCN determination accuracy while maintaining reliable communication
2Reliability
If incorrect GSCN is assumed, then cell access is hindered and latency increases, but the system continues to operate with reduced quality
Solution Approach 1:
The patent performs preliminary GSCN determination using differential phase value comparison before actual cell access operations. By resolving GSCN ambiguity in advance through phase-based measurement, the system ensures correct GSCN selection prior to communication establishment, preventing latency increases and maintaining high reliability without requiring retransmission or correction operations
3Reliability
If GSCN ambiguity exists due to Doppler shift, then communication quality decreases, but frequency overlap cannot be avoided in non-terrestrial networks
Solution Approach 1:
The patent uses differential phase values as an intermediary that is insensitive to Doppler shift effects. By measuring phase differences rather than absolute frequencies, the system can accurately determine GSCN even when Doppler shift causes frequency overlap, thus maintaining communication quality while preserving the ability to operate across wide frequency ranges in non-terrestrial networks
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enhances communication reliability and capacity by accurately determining the correct GSCN, reducing latency and avoiding false decoding events.
Implementation Method 1
the ambiguity in determining the correct global synchronization channel number (GSCN) due to frequency overlap and Doppler shift
Data Source
AI summary
Methods, systems, and devices for wireless communications at a user equipment (UE) are described. The UE may receive a reference signal over frequency resources that may overlap with a first frequency range associated with a first global synchronization channel quantity (GSCN) and a second frequency range associated with a second GSCN. The UE may select the first GSCN or the second GSCN based on a comparison between one or more first differential phase values obtained from a first hypothetical phase sequence associated with the first GSCN, one or more second differential phase values obtained from a second hypothetical phase sequence associated with the second GSCN, one or more third differential phase values associated with a reference signal phase sequence associated with the reference signal, or a combination thereof. The UE may communicate using the first GSCN or the second GSCN in accordance with the selection.