Mobile Station Selective CSG Measurement for Priority Calls
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Solution Overview
Problem
Conventional mobile communication systems fail to effectively report measurement results from unregistered CSG cells during priority calls, leading to reduced coverage range and increased call loss and disconnection probabilities due to unnecessary power consumption and inefficient handover processes.
Innovation Solution
A mobile communication system where the mobile station apparatus determines whether to transmit measurement results from access-restricted base stations based on communication priority, allowing for selective measurement and handover of unregistered CSG cells during priority calls, and prioritizes channel state measurement accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the mobile station apparatus performs measurement and reports all neighboring cells including unregistered CSG cells, then the coverage range is improved and handover options are increased, but the power consumption increases and unnecessary handovers occur
Solution Approach 1:
The mobile station dynamically adjusts its measurement and reporting behavior based on the type of communication (normal call vs. priority call). During normal calls, it excludes unregistered CSG cells from measurement reports to save power. During priority calls, it includes these cells to ensure coverage and enable handover options. This dynamic adaptation resolves the contradiction between coverage and power consumption.
Solution Approach 2:
The system changes the measurement reporting parameter based on communication priority. For normal calls, the measurement report excludes unregistered CSG cells. For priority calls, the measurement report includes these cells. This parameter change allows the system to optimize power consumption during normal operations while ensuring coverage during critical communications.
2Loss of energy
If the mobile station apparatus excludes unregistered CSG cells from measurement reports, then the power consumption is reduced and unnecessary handovers are prevented, but the coverage range is reduced and call loss probability increases during priority calls
Solution Approach 1:
The mobile station dynamically switches between two measurement reporting modes based on communication priority. During normal calls, it uses the power-saving mode that excludes unregistered CSG cells. During priority calls, it switches to the reliability mode that includes these cells, thereby preventing call loss while maintaining power efficiency during normal operations.
Solution Approach 2:
The measurement reporting parameter is changed based on the communication type. For normal calls, the parameter excludes unregistered CSG cells to reduce power consumption. For priority calls, the parameter is changed to include these cells to ensure reliability and prevent call loss. This conditional parameter change resolves the contradiction between energy loss and reliability.
3Adaptability or versatility
If the mobile station apparatus performs measurement processing on all neighboring cells, then the handover options are increased, but the power consumption increases and measurement time is wasted
Solution Approach 1:
The set of neighboring cells is segmented into two categories: registered CSG cells and unregistered CSG cells. During normal calls, the mobile station only performs measurement processing on registered cells, excluding unregistered ones from measurement reports. During priority calls, it includes unregistered cells in the measurement report. This segmentation allows the system to reduce measurement time and power consumption during normal operations while maintaining handover options during critical communications.
Solution Approach 2:
During normal calls, the mobile station performs partial measurement processing, excluding unregistered CSG cells from measurement reports. This partial action reduces measurement time and power consumption. During priority calls, it performs complete measurement processing including all cells to ensure adequate handover options. This partial action during normal operations resolves the contradiction between handover options and measurement time.
Data Source
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AI summary
When communication of a type, such as a priority call, to be prioritized over a normal call has occurred, appropriate measurement of CSG cells is performed. There is provided a mobile station apparatus applied to a mobile communication system that includes a small base station apparatus which makes only mobile station apparatuses registered in advance accessible in normal case, and on the other hand, makes unregistered mobile station apparatuses accessible in non-normal case, wherein the mobile station apparatus is provided with at least: a cell information management section 103 that outputs cell type determination information for distinguishing a normal base station apparatus from a small base station apparatus; and a reception signal processing section 102 that selects whether or not to perform measurement of a channel state between the mobile station apparatus and the small base station apparatus, based on cell type determination information and access-class information indicating a priority of communication, and performs measurement of the channel state according to the selection result.