UE Interference Detection for CSG Handover Management
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) experiences interference when entering the proximity of a closed subscriber group (CSG) cell due to in-device coexistence (IDC) interference, which can disrupt communication and lead to unnecessary handovers.
Innovation Solution
The UE detects interference on a frequency and transmits a message to the base station, including information on the interference and an indication of entering the proximity of a neighbor cell, such as a CSG cell, to manage handovers and prioritize interference levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE performs handover procedure to the CSG cell when entering proximity, then the UE can access the restricted cell, but in-device coexistence interference occurs on the frequency
Solution Approach 1:
The UE performs interference detection before executing the handover procedure to the CSG cell. By detecting IDC interference in advance on the frequency where the CSG cell operates, the UE can determine whether to proceed with handover or remain on the current frequency, thereby preventing interference-related handover failures while maintaining access capability when conditions are favorable
Solution Approach 2:
The system implements feedback mechanisms where the UE reports interference detection results and proximity status to the network. The network uses this feedback information to make informed decisions about handover execution, frequency selection, and interference management, enabling adaptive control that balances access requirements with interference avoidance
2Reliability
If the UE transmits message including interference information and proximity indication, then the network can optimize handover decisions, but the message transmission overhead increases
Solution Approach 1:
The UE transmits a compact message containing only essential information elements (interference indication bit, proximity indication, and necessary frequency identifiers) rather than complete interference measurement data. This partial information approach provides the network with sufficient decision-making input while significantly reducing message size and transmission overhead compared to full measurement reports
Solution Approach 2:
The system changes the parameter representation by using binary indication bits (e.g., 1-bit interference indication, 1-bit proximity indication) instead of continuous measurement values. This parameter transformation reduces the information volume dramatically while preserving the critical decision-relevant characteristics needed for reliable handover control
Data Source
AI summary
A method and apparatus for transmitting a message in a wireless communication system is provided. A user equipment (UE) enters a proximity of a neighbor cell, detects interference on a frequency, and transmits a message, including information on the interference and an indication of entering the proximity of the neighbor cell, to a base station.