Handover Preprocessing System for CSG Cell Access Filtering
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Solution Overview
Problem
In 3GPP systems, handover preprocessing in CSG cells leads to resource wastage due to reissued notifications for CSG cells where access permission is not granted, causing inefficiencies in handover processes.
Innovation Solution
A handover preprocessing system where a mobile terminal receives notification information from a base station, verifies access permissions, and generates a message with frequency information for cells without access permission, which is then sent to the connected base station, allowing the base station to instruct the terminal to measure alternative frequencies, thereby preventing unnecessary signaling and resource wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mobile terminal notifies the serving base station of CSG cells detected during handover preprocessing, then the base station can consider these cells as handover destination candidates, but resource wastage occurs when the terminal reissues notifications for CSG cells where access permission is not granted
Solution Approach 1:
The mobile terminal performs preliminary access permission verification against the CSG white list before notifying the serving base station of detected CSG cells. This preliminary action filters out cells without access permission, preventing the base station from receiving unnecessary notification messages and thereby eliminating resource wastage while maintaining accurate handover destination selection.
2Productivity
If the mobile terminal notifies the serving base station of CSG cells with high reception quality, then handover to these cells can be facilitated, but PCI confusion may occur when CSG cells with the same PCI are present
Solution Approach 1:
The patent introduces the CSG white list as an intermediary filtering mechanism between the terminal's cell detection and the base station's handover decision. The terminal uses the CSG white list to verify access permission before notifying the base station, which acts as an intermediary step that prevents both PCI confusion and resource wastage by ensuring only authorized cells are considered for handover.
3Measurement precision
If the serving base station sets gaps or DRX for interrupting data transmission to enable system information detection, then the terminal can detect CGI of nearby base stations, but data transmission is interrupted
Solution Approach 1:
The mobile terminal performs preliminary access permission verification using the CSG white list before initiating system information detection. This preliminary filtering action ensures that the terminal only detects and reports CSG cells for which access permission is granted, making the subsequent gap/DRX period more efficient by avoiding unnecessary detection of unauthorized cells, thus reducing the impact on data transmission continuity.
Data Source
AI summary
A technology is disclosed that provides a handover preprocessing system and the like, the handover preprocessing system capable of eliminating waste of resources used as a result of notification being reissued of a CSG cell for which access is not granted. According to the technology, the handover preprocessing system is configured by: a base station 100 that is an object for connection of a mobile terminal 300, provides a plurality of cells indicating a range accessible by the mobile terminal, and transmits, to the mobile terminal, notification information including frequency information of each cell; the mobile terminal that verifies access permission for the cells based on the notification information received from the base station and, when access permission is not granted, generates a first message including frequency information corresponding to the cell for which access permission is not granted and transmits the first message to a connecting base station 200 to which the mobile terminal itself is currently connected; and the connecting base station that transmits, to the mobile terminal, a second message including a command giving an instruction to select a frequency other than a frequency specified by the frequency information included in the first message, based on the first message received from the mobile terminal.