Uplink Control Information Transmission in Carrier Aggregation
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Solution Overview
Problem
In LTE Rel. 13 and beyond, the challenge lies in adequately transmitting uplink control information using secondary cells (SCells) while ensuring proper uplink data transmission, as existing methods struggle to coordinate simultaneous PUCCH and PUSCH transmissions across multiple component carriers.
Innovation Solution
A user terminal employs a generating section to create uplink control information based on DL signals from the radio base station and a control section that manages the transmission of this information by applying simultaneous PUCCH and PUSCH transmission to each cell group, allowing for flexible allocation across multiple component carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If uplink control information is transmitted using PUCCH of secondary cells (SCells), then flexibility of wireless communication is improved, but coordination of simultaneous PUCCH and PUSCH transmission becomes complex
Solution Approach 1:
The patent divides the carrier aggregation system into multiple cell groups, where each cell group independently handles PUCCH and PUSCH transmission coordination. This segmentation allows the system to maintain flexibility by enabling PUCCH transmission on SCells while managing the complexity through localized control within each cell group rather than system-wide coordination.
2Productivity
If simultaneous PUCCH and PUSCH transmission is configured, then uplink transmission efficiency is improved, but transmission coordination across multiple component carriers becomes difficult
Solution Approach 1:
The patent segments the multiple component carriers into distinct cell groups, with each cell group independently configured for simultaneous PUCCH and PUSCH transmission. This approach improves uplink transmission efficiency by enabling parallel transmissions while simplifying coordination by confining the complexity to individual cell groups rather than requiring cross-carrier coordination.
Solution Approach 2:
The patent introduces a new dimension of organization by grouping carriers into cell groups, transforming the problem from managing individual carrier interactions to managing group-level configurations. This dimensional change allows simultaneous PUCCH and PUSCH transmission across multiple carriers while maintaining operational simplicity through group-based control.
Data Source
AI summary
The present invention is designed so that UL transmission can be made adequately even when transmission of uplink control information using secondary cells (SCells) is made configurable. A user terminal communicates with a radio base station by using carrier aggregation, and has a generating section that generates uplink control information based on a DL signal transmitted from the radio base station, and a control section that controls transmission of the uplink control information, and the control section controls the transmission of the uplink control information by applying simultaneous transmission of an uplink control channel and an uplink shared channel to each of a plurality of cell groups, each including at least one component carrier (CC).