UE Cell Selection Using Stored Redirection Results
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently determining neighbor cells for power scan and synchronization channel decoding procedures, leading to increased latency and power consumption due to unpredictable failures in detecting frequency correction channel (FCCH) and synchronization channel (SCH) signals within short measurement gaps, especially during inter-radio access technology (IRAT) measurements.
Innovation Solution
A method and apparatus that receive a redirection command from a serving cell, which includes a list of neighbor frequencies, and evaluate these frequencies to match with previously recorded neighbor cells based on redirection results, allowing for selective power scan and synchronization channel decoding procedures to optimize cell selection and reduce latency by using previously recorded successful redirection paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power scan and synchronization channel decoding are performed on all neighbor cells, then cell selection reliability is improved, but latency and power consumption increase
Solution Approach 1:
The system performs preliminary actions by storing redirection results and cell information from previous serving cells before actual handover occurs. When a redirection command is received, the UE checks whether current neighbor cells match previously recorded cells, allowing it to skip redundant power scans and synchronization channel decoding for cells with known successful redirection outcomes, thereby reducing latency while maintaining reliability
Solution Approach 2:
The patent uses copying by storing and reusing redirection result information from previous cell measurements. Instead of performing complete power scans on all neighbor cells, the system copies previously validated cell information and redirection outcomes, applying them to current handover decisions. This eliminates redundant measurements while preserving the reliability benefits of thorough cell evaluation
2Reliability
If power scan and synchronization channel decoding are performed on all neighbor cells, then cell selection reliability is improved, but power consumption increases
Solution Approach 1:
The system performs preliminary actions by storing redirection results and cell information from previous serving cells before actual handover occurs. When a redirection command is received, the UE checks whether current neighbor cells match previously recorded cells, allowing it to skip redundant power scans and synchronization channel decoding for cells with known successful redirection outcomes, thereby reducing power consumption while maintaining reliability
Solution Approach 2:
The patent uses copying by storing and reusing redirection result information from previous cell measurements. Instead of performing complete power scans on all neighbor cells, the system copies previously validated cell information and redirection outcomes, applying them to current handover decisions. This eliminates redundant measurements while preserving the reliability benefits of thorough cell evaluation
3Reliability
If all neighbor cells are evaluated for handover, then handover reliability is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary actions by storing redirection results and cell information from previous serving cells. When a redirection command is received, the UE checks whether current neighbor cells match previously recorded cells using stored identification information. This preliminary matching process simplifies the evaluation by pre-identifying cells that require full evaluation versus those with known outcomes, reducing device complexity while maintaining handover reliability
Data Source
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AI summary
A user equipment (UE) speeds up circuit switched fallback call establishment and reduces circuit switched fallback call establishment failure. In one instance, the UE receives a redirection command including a list of current neighbor cells/frequencies. The UE determines whether a current serving cell matches a previous serving cell stored in the UE. The UE also evaluates the list of current neighbor cells to determine whether each current neighbor cell matches a previous neighbor cell associated with the previous serving cell. The UE then determines neighbor cells for power scan and/or synchronization channel decoding procedures to select one of the current neighbor cells to redirect the UE based on the previously recorded type of redirection result.