Carrier Aggregation Event Determination for Mobile Station Power Reduction
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Solution Overview
Problem
In Advanced EUTRA communication systems, mobile station apparatuses face challenges in efficiently determining event conditions for handover when connected to base stations using multiple frequency bands, as conventional measurement methods are not applicable, leading to unnecessary power consumption and potential communication disconnections.
Innovation Solution
The system includes a base station apparatus that informs the mobile station apparatus of event conditions and parameters for measuring reception quality across multiple carrier components, allowing the mobile station to adjust and determine whether the event conditions are satisfied, thereby reducing unnecessary event reporting and improving communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station apparatus measures reception qualities of multiple carrier components and performs event determination for handover, then handover capability is improved, but power consumption increases due to unnecessary event reporting
Solution Approach 1:
The patent applies local quality by differentiating event determination behavior across different carrier components. For the serving cell carrier, event determination is performed normally, while for non-serving cell carriers in carrier aggregation, event determination is suppressed. This localized differentiation resolves the contradiction by enabling handover capability where needed while avoiding unnecessary power consumption where not needed.
Solution Approach 2:
The patent segments the carrier components into two categories: serving cell carriers and non-serving cell carriers. This segmentation allows the mobile station to apply different measurement and reporting rules to each segment, thereby maintaining necessary handover functionality while eliminating redundant event reporting that causes unnecessary power consumption.
2Measurement precision
If the mobile station apparatus performs event determination for all carrier components, then measurement accuracy is improved, but communication stability deteriorates due to unnecessary handover failures
Solution Approach 1:
The patent applies local quality by restricting event determination to only the serving cell carrier while suppressing it for non-serving cell carriers. This resolves the contradiction by maintaining precise reception quality measurement for handover decisions on the serving cell while preventing measurement-induced handover failures on non-serving cells that are not intended for handover.
Solution Approach 2:
The patent extracts the event determination function from non-serving cell carriers while preserving it for the serving cell carrier. This extraction eliminates the source of unnecessary handover failures on non-serving cells while maintaining the necessary measurement precision and handover capability on the serving cell.
3Reliability
If the base station apparatus controls handover for all carrier components, then handover control capability is improved, but device complexity increases
Solution Approach 1:
The patent extracts event determination from non-serving cell carriers while preserving it for the serving cell carrier. This simplifies the base station's handover control by reducing the number of carrier components requiring event monitoring and determination, thereby lowering device complexity while maintaining essential handover control capability.
Solution Approach 2:
The patent segments carrier components into serving and non-serving categories, allowing the base station to apply simplified control rules to non-serving cells while maintaining full handover control capability for the serving cell. This segmentation reduces overall control complexity while preserving necessary functionality.
Data Source
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AI summary
In a communication system in which a mobile station apparatus is connected to a base station apparatus simultaneously using a plurality of frequency bands, an event is efficiently determined concerning measurement of reception qualities of the frequency bands. The mobile station apparatus includes: a reception unit 201 that receives from the base station apparatus an event condition for measuring a reception quality of at least one carrier component defined in the frequency bands different from each other and a parameter used for determining whether or not the event condition is satisfied; a measurement processing unit 207 that measures the reception quality of the at least one carrier component; a cell determination unit 225 that determines whether or not to adjust the received parameter; and an event determination unit 209 that sets the event condition based on the received parameter or the adjusted parameter and that determines whether or not the set event condition is satisfied.