UE Measurement Reporting for CSG Cell Handover
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Solution Overview
Problem
In mobile communication systems, existing measurement reporting mechanisms fail to efficiently handle handovers between macro cells and Closed Subscriber Group (CSG) cells, leading to numerous useless measurement reports and impaired network performance, as they cannot effectively evaluate or report CSG cells not on configured frequencies.
Innovation Solution
A User Equipment (UE) in a connected state initiatively detects accessible CSG cells not on configured frequencies, evaluates their signal quality, and reports them if accessible, using default configuration parameters and identity information to ensure timely and accurate measurement reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE reports all measured neighboring cells according to existing measurement reporting mechanisms, then the network receives comprehensive measurement data, but numerous useless measurement reports are generated due to inability to evaluate CSG cells not on configured frequencies
Solution Approach 1:
The patent changes the evaluation parameters for CSG cells by introducing CSG-specific criteria (CSG identity matching, access mode checking) alongside traditional signal quality parameters. This allows the UE to filter and report only relevant CSG cells, improving measurement reporting accuracy while reducing unnecessary reports that consume network resources.
2Reliability
If the UE actively detects and reports accessible CSG cells not on configured frequencies, then handover decisions can be made timely and accurately, but the UE must perform additional detection and evaluation operations
Solution Approach 1:
The patent applies preliminary action by having the UE proactively detect and evaluate accessible CSG cells before handover decisions are required. The UE performs advance detection of CSG cells not on configured frequencies, evaluates their accessibility using stored CSG identities and access modes, and prepares measurement reports in advance, ensuring reliable handover decisions without adding significant operational complexity during critical handover moments.
3Adaptability or versatility
If the network configures measurement frequencies to include all possible CSG cell frequencies, then all CSG cells can be measured and reported, but the measurement configuration becomes overly broad and includes unnecessary frequencies
Solution Approach 1:
The patent applies local quality by differentiating measurement evaluation criteria based on cell type. Instead of using a uniform measurement configuration for all cells, the UE applies CSG-specific evaluation rules (checking CSG identities against stored allowed CSG lists, verifying access modes) only to CSG cells. This allows targeted measurement of relevant CSG cells without requiring the network to configure measurement for all possible frequencies, optimizing both coverage and configuration size.
Data Source
AI summary
A measurement reporting method for a Closed Subscriber Group (CSG) cell and a corresponding User Equipment (UE) are provided in the present invention. The method comprises the following steps that: after detecting a neighboring accessible CSG cell which is not on a frequency in a measurement configuration, a UE in a connected state requests a network for a measurement configuration by reporting indication information which contains the frequency information of the accessible CSG cell and/or the bandwidth information of the accessible CSG cell. The present invention solves the problem about the measurement and reporting of a CSG cell by a UE, so that a network is able to make a decision in time according to a measurement report, satisfying the requirement of the UE on mobility.