5G NR UE Frequency Scan via PSS Hypothesis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G NR wireless communication systems, user equipment (UE) faces challenges in efficiently and accurately detecting cells during the initial acquisition process due to the need to search multiple frequency rasters, which can lead to mistaken PSS detection caused by cyclic shifts of synchronization signals across different frequency rasters.
Innovation Solution
The UE performs a primary synchronization signal (PSS) search on a first frequency raster and, upon detection, searches for synchronization signals on a second frequency raster based on the detected PSS hypothesis, selecting the second frequency raster from the group based on the PSS hypothesis, and also searches for secondary synchronization signals (SSS) to confirm cell detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE searches multiple frequency rasters to ensure comprehensive cell detection, then the reliability of cell detection is improved, but the time required for initial acquisition increases
Solution Approach 1:
The patent applies preliminary action by performing a PSS search on a first frequency raster before systematically searching other frequency rasters. This preliminary detection on the first raster provides early information about potential cell locations, allowing the UE to prioritize subsequent searches and reduce overall acquisition time while maintaining comprehensive detection across multiple rasters
2Measurement precision
If the UE performs systematic search across all frequency rasters, then the measurement precision of cell location detection is improved, but the complexity of the detection process increases
Solution Approach 1:
The patent applies segmentation by dividing the frequency raster search into distinct stages: first searching the initial frequency raster for PSS, then based on that detection result, systematically searching other frequency rasters for SSS. This segmented approach breaks down the complex multi-raster search into manageable phases, reducing overall process complexity while maintaining detection accuracy
Solution Approach 2:
By performing PSS detection on the first frequency raster as a preliminary step before SSS search, the patent establishes a structured sequence that simplifies the overall detection process. The preliminary PSS result guides subsequent SSS search operations, making the systematic search more manageable and less complex
3Reliability
If the UE searches for both PSS and SSS on multiple frequency rasters, then the reliability of synchronization is improved, but the loss of time during initial acquisition increases
Solution Approach 1:
The patent performs PSS search on the first frequency raster as a preliminary action before initiating SSS search. This preliminary detection provides early synchronization information and guides the subsequent SSS search, enabling the UE to achieve reliable synchronization faster by avoiding simultaneous exhaustive search of all rasters for both signals
Solution Approach 2:
The synchronization process is segmented into two phases: first detecting PSS on the initial frequency raster, then using that information to guide SSS search on appropriate frequency rasters. This segmentation reduces the time required for complete synchronization while maintaining reliability by ensuring both PSS and SSS are detected through a structured approach
Data Source
AI summary
In order to improve cell detection in NR, a user equipment apparatus performs a PSS search on a first frequency raster from a group of frequency rasters. When the UE detects a PSS on the first frequency raster corresponding to a PSS hypothesis, the UE searches for an SS on a second frequency raster based at least on part on the detected PSS hypothesis on the first frequency raster. The UE may search for a plurality of hypotheses of the SS corresponding to the detected PSS hypothesis on the first frequency raster and the second frequency raster. The second frequency raster may be selected from the group of frequency rasters based at least in part on the detected PSS hypothesis or the first frequency raster on which the PSS was detected.