Carrier Aggregation Priority Selection for Power Reduction
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Solution Overview
Problem
There is no specific method for determining the anchor carrier and component carriers for carrier aggregation in LTE-A wireless communication systems, leading to increased power consumption due to monitoring multiple frequency bands simultaneously.
Innovation Solution
A wireless communication system that includes a receiving unit, a priority storage unit, and a communication control unit to determine and notify the anchor carrier and component carriers based on receiving quality, allowing the system to selectively use frequency bands with lower priority for data transmission, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal device monitors multiple component carriers simultaneously to maintain compatibility with LTE carrier aggregation, then communication capability is improved, but power consumption increases
Solution Approach 1:
The patent segments the monitoring task by dividing component carriers into two categories: anchor carrier (monitored continuously) and non-anchor carriers (monitored only when notified). This segmentation allows the terminal to maintain carrier aggregation capability while reducing power consumption by not continuously monitoring all component carriers.
Solution Approach 2:
The patent implements periodic monitoring where the terminal device monitors the anchor carrier continuously but only monitors non-anchor carriers at specific intervals when notified by the base station. This periodic action pattern reduces the overall monitoring burden and power consumption while maintaining communication capability.
2Adaptability or versatility
If control information is distributed across multiple component carriers, then communication flexibility is improved, but the terminal device's receiving complexity increases
Solution Approach 1:
The patent merges control information for multiple component carriers into the anchor carrier. The base station transmits control information including component carrier indication information on the anchor carrier, which then notifies the terminal about which non-anchor carriers to monitor. This merging reduces the terminal's receiving complexity by consolidating control information in one place.
Solution Approach 2:
The anchor carrier acts as an intermediary that mediates between the base station and non-anchor carriers. Control information is first transmitted on the anchor carrier, which then provides indication information to guide the terminal's monitoring of non-anchor carriers. This intermediary approach simplifies the terminal's receiving process.
3Productivity
If carrier aggregation is implemented across multiple frequency bands, then communication capacity is improved, but determining the optimal frequency bands requires extensive communication overhead
Solution Approach 1:
The base station performs preliminary actions by pre-configuring and notifying the terminal about anchor carrier and non-anchor carrier relationships before actual data transmission. The component carrier indication information is provided in advance, allowing the terminal to prepare its monitoring strategy and reducing the need for extensive real-time communication overhead.
Data Source
AI summary
A wireless communication apparatus includes: a receiving unit that receives a signal indicating a frequency band having the highest priority of selection among a plurality of frequency bands; and a transmitting unit that transmits data in parallel, using the frequency band having the highest priority of selection and a frequency band having a priority of selection lower than that of the frequency band having the highest priority of selection.