LTE Measurement Reporting for CSG Cell Detection
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Solution Overview
Problem
Current wireless communications systems, particularly in LTE and UTRA technologies, face limitations in measurement reporting, as they cannot include Closed Subscriber Group (CSG) cells of a home deployment type in neighboring cell lists, leading to incomplete measurement data and potential ambiguities in handover processes.
Innovation Solution
The system enhances measurement reporting by allowing mobile communications devices to detect and report on CSG cells of a home deployment type, which are not initially included in measurement configurations, by updating the neighboring cell list to include these cells and performing measurements on both listed and detected cells, thereby improving data accuracy and handover capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the UE only measures and reports on listed cells within measurement objects, then the measurement configuration follows current 3GPP specifications, but CSG cells of home deployment type cannot be detected and reported leading to incomplete measurement data
Solution Approach 1:
The service network pre-configures the UE with measurement objects containing listed cells before the UE needs to perform measurements. This preliminary configuration enables the UE to have measurement capabilities ready in advance, allowing it to detect and report CSG cells that were not explicitly listed, thereby resolving the contradiction between complete measurement data and configuration complexity.
Solution Approach 2:
The patent introduces an intermediary mechanism where the UE detects cells beyond the explicitly listed measurement objects and reports them through a two-step process: first reporting detected cell identities, then receiving follow-up configuration for detailed measurement. This intermediary detection and reporting phase bridges the gap between limited initial configuration and comprehensive measurement coverage.
2Adaptability or versatility
If the UE performs measurements on detected cells not listed in measurement objects, then comprehensive measurement coverage including CSG cells is achieved, but the current measurement configuration framework cannot support this capability
Solution Approach 1:
The measurement configuration is made dynamic through a two-phase approach: initial configuration with listed cells, followed by adaptive supplementation when the UE detects additional cells. The service network can dynamically add detected CSG cells to the measurement configuration based on UE reports, enabling the system to adapt to varying deployment scenarios while maintaining reliable handover processes.
Solution Approach 2:
The patent implements a feedback mechanism where the UE reports detected cell identities to the service network, which then uses this feedback information to update measurement configurations. This closed-loop feedback system enables the network to reliably incorporate CSG cells into measurements based on actual UE detections, improving both adaptability and handover reliability.
3Measurement precision
If CSG cells are not included in neighboring cell lists, then the current working assumption in 3GPP specifications is maintained, but ambiguities in handover processes occur due to Physical Cell Identity confusion
Solution Approach 1:
The patent segments the cell identification process into multiple stages: initial cell detection, reporting of detected cell identities, and subsequent detailed measurement configuration. This segmentation allows CSG cells to be properly identified and distinguished from other cells, eliminating Physical Cell Identity confusion while maintaining straightforward handover operations through structured, step-by-step processing.
Data Source
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AI summary
A mobile communications device with a wireless module and a controller module is provided. The wireless module performs wireless transceiving to and from a first cellular station of a first service network and a second cellular station of a second service network, wherein the first service network is a long term evolution (LTE) network and the second service network is a Universal Mobile Telecommunications System (UMTS) network. The controller module receives a measurement request message from the first cellular station via the wireless module, performs a measurement on the second cellular station in response to the measurement request message and reports the measurement result to the first service network via the wireless module, wherein the second cellular station is previously not requested or configured by the first service network to be measured.