Carrier Aggregation Channel Selection in Unlicensed Bands
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Solution Overview
Problem
Current mobile communication systems face limitations in improving data transmission/reception rates due to limited frequency resources and low mutual compatibility between frequency bands, especially when using carrier aggregation technology.
Innovation Solution
A method and apparatus for configuring carrier aggregation (CA) using an unlicensed frequency band, where a user equipment (UE) receives channel candidate information from a base station, transmits channel state information, and adds a channel with the smallest signal interference as a secondary cell, selected by the base station, to minimize interference and enhance data processing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation technology is used to aggregate multiple component carriers, then data transmission rate is improved, but frequency resources are limited and mutual compatibility between frequency bands is low
Solution Approach 1:
The patent transitions from traditional licensed frequency bands to unlicensed frequency bands (5GHz, 60GHz) as a new dimension for carrier aggregation. This allows the system to access additional spectral resources beyond the conventional licensed spectrum, thereby increasing available frequency resources while maintaining high data transmission rates through carrier aggregation
2Quantity of substance
If unlicensed frequency bands are used for additional carriers, then available frequency is increased, but signal interference increases
Solution Approach 1:
The patent implements a feedback mechanism where the user equipment measures channel state information of candidate channels in unlicensed bands and reports this information to the base station. The base station uses this feedback to intelligently select channels with minimal interference for carrier aggregation, thereby increasing available frequency while managing signal interference through data-driven decision making
Solution Approach 2:
The patent changes the selection criteria for carrier aggregation channels by introducing channel state information as a key parameter. Instead of arbitrary or static channel selection, the system dynamically selects channels based on measured parameters such as interference levels and channel quality, optimizing the balance between available frequency and signal interference
3Measurement precision
If channel state information is measured and reported for each candidate channel, then channel selection accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential channel state information needed for channel selection from the complete set of possible measurements. By identifying and reporting only the critical parameters related to interference and channel quality, the system achieves accurate channel selection while minimizing signaling overhead by excluding redundant information
Data Source
AI summary
Provided are a method and a device for selecting a channel of an unlicensed band in configuring carrier aggregation for a terminal using an unlicensed band cell which uses an unlicensed frequency band. The method may include: receiving, from a base station, channel candidate information of a secondary cell using an unlicensed frequency band; transmitting channel state information with respect to one or more channels generated using the channel candidate information; and adding, as the secondary cell, a channel selected on the basis of the channel state information by the base station; and a device.