Mobile Station CSG Cell Measurement Reporting
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Solution Overview
Problem
The existing handover procedure from a macro cell to a CSG cell in mobile communication systems lacks specific definitions for how the macro radio base station should instruct the mobile station to measure radio qualities and how the mobile station should report these measurements, leading to inefficiencies.
Innovation Solution
A mobile station and radio base station configuration that includes an access right manager unit to manage access restricted group IDs, a measurement unit to measure radio qualities of access restricted cells, and a Measurement Report transmitter unit to send reports only when the radio quality meets specific conditions, with the ability to securely acquire measurement gaps and indicate which cells correspond to access restricted group IDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the mobile station measures radio qualities of all access restricted cells, then the measurement coverage is improved, but the measurement complexity and processing load increase
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different cells based on their access restricted group ID. The mobile station identifies cells with the same access restricted group ID as the serving cell and prioritizes measuring only those cells, rather than uniformly measuring all cells. This localized approach focuses measurement resources on relevant cells while reducing overall measurement complexity.
2Loss of information
If the mobile station sends measurement reports for all measured cells, then the reporting completeness is improved, but the signaling overhead increases
Solution Approach 1:
The patent extracts and transmits only the essential measurement information related to cells with the same access restricted group ID as the serving cell. By filtering out measurement reports for cells with different access restricted group IDs, the system removes unnecessary signaling overhead while retaining the critical information needed for handover decisions within the same closed subscriber group.
3Measurement precision
If the macro radio base station provides detailed measurement instructions for each cell, then the measurement guidance precision is improved, but the control message complexity increases
Solution Approach 1:
The patent applies universality by using a single measurement instruction message that serves multiple purposes. The macro radio base station provides measurement instructions that apply universally to all cells with the same access restricted group ID, rather than providing separate instructions for each cell. This reduces control message complexity while maintaining the precision needed for measurements of relevant cells.
Data Source
AI summary
A mobile station LIE is provided with an access right management unit for managing a CSG-ID corresponding to a CSG cell which permits the mobile station UE to access thereto, a measurement unit for measuring the radio quality of a CSG cell defined as an object to be measured, and a measurement report transmission unit for, only when the radio quality of a CSG cell corresponding to the CSG-ID managed by the access right management unit out of the radio qualities of CSG cells measured by the measurement unit satisfies a report condition, transmitting a measurement report including at least the radio quality of the CSG cell corresponding to the CSG-ID.