Cross-Correlation Signal Processing for Mobile Radio Cell Scans
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional mobile radio communication terminal devices face inefficiencies in PLMN search processes due to long frequency scan times and poor quality of frequency scan outputs, especially when dealing with a large number of candidate EARFCNs, leading to suboptimal user experience.
Innovation Solution
The implementation of a cross-correlation based method to evaluate potential carrier channels, which improves the detection accuracy and robustness against interference by correlating received signals with pre-stored reference signals, thereby enhancing the selection of suitable carrier channels for communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If RSSI-based frequency scan is used, then frequency scan time is short, but quality of frequency scan output is poor due to vulnerability to interference
Solution Approach 1:
The patent introduces an intermediary processing stage between frequency scan and cell scan. The frequency scan output is processed to generate an improved cell scan input, which acts as a mediator that enhances the quality of cell detection while maintaining the speed benefits of RSSI-based scanning. This intermediary processing includes evaluating multiple candidate cells and selecting the most promising ones for further scanning.
Solution Approach 2:
The patent performs preliminary evaluation of frequency scan results before proceeding to cell scan. By pre-processing the frequency scan output and identifying candidate cells in advance, the system prepares quality information beforehand, which then guides the cell scan process more effectively, reducing the need for exhaustive scanning.
2Measurement precision
If conventional frequency scan is performed for all candidate EARFCNs, then frequency scan output quality may improve, but frequency scan time becomes quite long
Solution Approach 1:
The patent applies partial action by not performing exhaustive cell scans on all frequency scan candidates. Instead, it selectively processes only the most promising candidates identified through intermediary evaluation. This partial processing approach achieves sufficient detection quality without the time cost of complete scanning of all 692 EARFCNs.
Solution Approach 2:
The patent segments the frequency scan process into multiple stages: initial RSSI-based scanning, intermediary evaluation and filtering, and selective cell scan on candidate cells. This segmentation allows the system to handle the large number of EARFCNs in manageable portions, improving overall efficiency while maintaining detection quality.
3Reliability
If the number of candidate EARFCNs is large, then comprehensive cell detection may improve, but time spent on frequency scan and PLMN search becomes intolerable
Solution Approach 1:
The patent performs preliminary filtering of candidate EARFCNs using RSSI measurements and intermediary processing before committing to full cell scan procedures. This preliminary action identifies a reduced set of candidate cells that are most likely to be valid, allowing comprehensive detection to be achieved on a smaller subset rather than all possible EARFCNs.
Solution Approach 2:
The patent uses partial action by performing incomplete or reduced scanning on non-candidate cells while applying full scanning only to identified candidates. This approach achieves reliable cell detection for actual networks while avoiding the time penalty of exhaustive scanning across all 692 EARFCNs.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A mobile radio communication terminal device may include at least one circuit configured to perform a method of processing received digitized signals, the method including determining a plurality of cross-correlation coefficients for the received digitized signal. Each of the plurality of cross-correlation coefficients may be determined by cross-correlating the received digitized signal with a respective candidate mobile radio local reference signal out of a plurality of pre-stored candidate mobile radio local reference signals. The at least one circuit may be further configured to select one or more cross-correlation coefficients from the determined plurality of cross-correlation coefficients and perform a mobile radio cell scan based on one or more of the selected cross-correlation coefficients, thereby determining a mobile radio communication network to connect to.