Uplink Control Information Transmission via PUSCH in Carrier Aggregation
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Solution Overview
Problem
In LTE communication systems, especially before Release-11, PUCCH is only supported on the PCell, leading to resource shortages when multiple user apparatuses use the same cell, and there is no mechanism to determine which cell's PUSCH to use for piggybacking uplink control information in CA scenarios, causing uncertainty for both the user apparatus and the radio base station.
Innovation Solution
A user apparatus is equipped with a control unit to determine whether a physical uplink shared channel is set at the time of uplink control information transmission and to transmit this information using either a primary cell's or a secondary cell's PUSCH, based on availability and configuration, ensuring proper channel selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If PUCCH is only supported on PCell, then device complexity is reduced, but resource availability deteriorates when multiple user apparatuses use the same cell
Solution Approach 1:
The patent segments the PUCCH function across multiple cells (PCell and SCells) rather than concentrating it solely on the PCell. This allows distribution of uplink control information transmission across different component carriers, increasing resource availability while maintaining manageable complexity through structured configuration rules.
Solution Approach 2:
The patent enables both PCell and SCell to serve dual functions: PCell provides primary control channel function while SCell provides supplementary control channel function. This multi-functionality approach increases overall resource availability without requiring completely separate dedicated resources for each cell type.
2Productivity
If PUSCH is used for piggybacking uplink control information in CA scenarios, then resource utilization is improved, but determination accuracy deteriorates due to lack of mechanism
Solution Approach 1:
The patent implements feedback mechanisms where the eNB provides configuration information about which cells have PUCCH resources available, and the UE reports its selected channel. This feedback loop enables accurate determination of the appropriate PUSCH for piggybacking while maintaining high resource utilization efficiency.
Solution Approach 2:
The patent performs preliminary configuration and determination actions by pre-configuring which cells support PUCCH and establishing determination rules before actual transmission occurs. This allows the UE to accurately determine the appropriate channel in advance, improving both resource utilization and determination accuracy.
3Adaptability or versatility
If multiple cells are configured for CA, then service versatility is improved, but device complexity increases due to additional configuration requirements
Solution Approach 1:
The patent applies local quality by configuring PUCCH resources selectively on specific cells (PCell and certain SCells) rather than uniformly across all cells. This allows CA versatility to be maintained while reducing complexity by only enabling PUCCH functionality where needed and where resources are available.
Solution Approach 2:
The patent uses parameter changes in the form of configuration flags and indicators that dynamically specify which cells support PUCCH and which are available for piggybacking. This allows the system to maintain high versatility for CA scenarios while managing complexity through flexible, changeable configuration parameters rather than fixed complex structures.
Data Source
AI summary
A user apparatus in a mobile communication system in which carrier aggregation is performed using a plurality of cells is disclosed. The user apparatus includes a processor that determines whether a physical uplink shared channel (PUSCH) is set in the user apparatus at a transmission timing of uplink control information, and determines to transmit the uplink control information by using the PUSCH when the PUSCH is set. The user apparatus also includes a transmitter that transmits the uplink control information to a radio base station using the PUSCH. The processor determines, when a PUSCH is set in a first cell in the plurality of cells, to transmit the uplink control information using the PUSCH. When no PUSCH is set in the first cell, the processor determines to transmit the uplink control information using a PUSCH in a second cell.