Mobile Station CSG Handover Measurement Configuration
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Solution Overview
Problem
In mobile communication systems, handover to a CSG cell fails, leading to unnecessary resource usage when a mobile station attempts handover based on measurement reports from UEs not belonging to the CSG, causing inefficiencies.
Innovation Solution
The mobile station requests and configures measurements for neighboring CSG cells, reporting PCI and reception quality, and the radio base station determines accessibility and initiates handover only when the UE is accessible to the CSG cell, avoiding resource wastage by managing measurement configurations and handover processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the mobile station UE performs handover to a CSG cell based on measurement report without verifying CSG membership, then handover speed is improved, but resource wastage increases due to failed handover attempts
Solution Approach 1:
The system performs preliminary verification of CSG membership by checking the CSG-ID against the Allowed CSG List before initiating handover. The source eNB verifies whether the UE is authorized to access the target CSG cell by comparing the CSG-ID obtained from the target cell with the UE's Allowed CSG List, preventing unnecessary handover attempts and resource wastage while maintaining efficient handover for authorized UEs
2Adaptability or versatility
If the mobile station UE measures all neighboring cells including CSG cells, then measurement coverage is improved, but measurement complexity increases
Solution Approach 1:
The system differentiates measurement requirements based on UE type and target cell type. For UEs belonging to the CSG, full measurement and handover to CSG cells is enabled. For UEs not belonging to the CSG, measurement and handover to CSG cells is restricted or disabled. This local differentiation reduces unnecessary measurements for non-CSG UEs while maintaining full functionality for CSG UEs, balancing coverage and complexity
Data Source
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AI summary
A mobile station UE according to the present invention comprising a gist thereof is to include, a measurement configuration acquisition unit 12 configured to acquire a measurement configuration for a second cell #2 frequency f2 from the radio base station eNB#A managing a first cell #1 by transmitting a measurement configuration request to the radio base station eNB#A managing the first cell, when it is determined that it is determined to desire to measure the second cell #2 using a frequency f2 different from a frequency f1 of the first cell #1 in communication and there is not held the measurement configuration for a second cell #2 frequency f2 ; and a measurement report transmission unit configured to transmit a measurement report including a reception quality in the second cell #2, to the radio base station eNB#A managing the first cell #1, in response to the received measurement configuration for a second cell #2 frequency f2.