Cell Selection Efficiency in Barred Base Stations
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Solution Overview
Problem
The existing cell selection procedures in mobile communication systems are inefficient when a base station switches to a barred status, as they require scanning all RF channels or rely on outdated information, leading to decreased performance and potential failure in finding a suitable cell.
Innovation Solution
The method involves the base station providing cell re-selection related information, such as carrier frequencies and neighboring cells information, to the user equipment (UE) through System Information Blocks (SIBs), allowing the UE to update its information and improve the efficiency of the cell selection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the initial cell selection procedure is used to scan all RF channels, then the UE can find a suitable cell, but the time required for cell selection becomes too long
Solution Approach 1:
The base station performs preliminary actions by proactively providing cell re-selection information (carrier frequencies, neighboring cell lists) to the UE before the UE needs to perform full cell selection. This allows the UE to have updated information ready, avoiding the need to scan all RF channels from scratch when the serving cell becomes barred, thus reducing cell selection time while ensuring reliability
Solution Approach 2:
The patent extracts only the essential cell re-selection information (carrier frequencies and neighboring cell lists) that the UE needs to perform efficient cell selection, rather than requiring the UE to process all possible RF channels. This selective information extraction enables the UE to quickly identify suitable cells without exhaustive scanning
2Loss of time
If the stored information cell selection procedure is used, then the cell selection time is reduced, but the performance decreases when stored information is outdated
Solution Approach 1:
The base station implements a feedback mechanism by monitoring its own cell status and proactively notifying UEs when the cell becomes barred. The base station provides updated cell re-selection information (carrier frequencies, neighboring cell lists) in response to its own status changes, ensuring the UE always has current information for accurate cell selection without needing to perform exhaustive scans
Solution Approach 2:
The base station performs preliminary updates by providing cell re-selection information to the UE before the UE encounters cell selection failures. When the base station determines it will become barred or is already barred, it proactively transmits updated neighboring cell information, ensuring the UE has valid stored information ready for immediate use, thus maintaining both speed and accuracy
Data Source
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AI summary
A method of handling serving cell becoming barred status, a base station (BS) using the same, and an user equipment (UE) using the same are provided. A cell status is changed into barred status is determined, and a first signaling message comprising a cell information indicator is transmitted by the BS, wherein the cell information indicator is used for indicating whether to transmit a second signal message comprising cell re-selection related information. The first signal message comprising the cell information indicator is received by the UE. When the UE determines that the BS switches to the barred status, the UE determines whether to receive the second signal message comprising the cell re-selection related information according to the cell information indicator in the first signal message.