Uplink Control Information Transmission in Carrier Aggregation Terminals
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Solution Overview
Problem
In LTE Rel. 13 and beyond, transmitting uplink control information using secondary cells (SCells) poses challenges in coordinating uplink control information and data transmission, requiring a method to ensure adequate UL transmission.
Innovation Solution
A terminal and radio communication method that control uplink control information transmission using both PUCCHs of primary and secondary cells, allowing for flexible wireless communication by configuring PUCCHs across multiple cell groups and determining HARQ timings based on duplex modes, enabling proper allocation and transmission of UCI on PUSCH within or across cell groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If uplink control information is transmitted using both primary and secondary cells (PUCCH on SCell), then flexibility of wireless communication is improved, but coordination complexity between uplink control information and data transmission increases
Solution Approach 1:
The patent segments the uplink control information transmission by introducing cell group concepts (first PUCCH cell group and second PUCCH cell group) with different PUCCH transmission configurations. This segmentation allows independent control and coordination of UCI transmission on different cell groups, reducing the overall coordination complexity while maintaining flexibility.
Solution Approach 2:
The patent implements dynamic control mechanisms where the network can configure and adjust PUCCH transmission parameters, cell group assignments, and uplink data transmission settings adaptively. This dynamic configuration enables the system to optimize the balance between flexibility and coordination complexity based on actual communication conditions.
2Adaptability or versatility
If PUCCH transmission is configured on secondary cells, then resource allocation flexibility is improved, but transmission reliability coordination becomes more difficult
Solution Approach 1:
The patent introduces cell group configurations as intermediary structures that mediate between the flexible PUCCH transmission on SCells and the reliable data transmission requirements. The cell group concept acts as a coordination layer that ensures proper reliability management while maintaining resource allocation flexibility.
Solution Approach 2:
The patent employs parameter changes by configuring different PUCCH transmission parameters, cell group assignments, and uplink data transmission settings based on channel conditions and traffic requirements. This allows the system to adapt transmission parameters dynamically to maintain both flexibility and reliability.
3Reliability
If uplink control information is concentrated on primary cells, then transmission reliability is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent segments UCI transmission across multiple cell groups (first PUCCH cell group and second PUCCH cell group) instead of concentrating all UCI on primary cells. This segmentation distributes the transmission load, improving resource utilization efficiency while maintaining reliability through diversified transmission paths.
Solution Approach 2:
The patent merges UCI transmission capabilities across multiple cells and cell groups, combining the resources of primary and secondary cells to achieve both reliability and efficient resource utilization. By merging transmission capabilities across the cell group, the system achieves better load distribution.
Data Source
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Figure 3
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 receiving section that receives a DL signal transmitted from the radio base station, a transmission section that transmits uplink control information that is generated based on the DL signal received, and a control section that controls transmission of the uplink control information, and, in this user terminal, the control section controls the transmission of the uplink control information using an uplink control channel and controls the transmission of the uplink control information using an uplink shared channel in each of a plurality of cell groups, each cell group including at least one component carrier (CC).