UCI Feedback Multiplexing in Inter-Band Carrier Aggregation
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Solution Overview
Problem
Conventional UCI multiplexing rules in wireless communication systems are inefficient for inter-band carrier aggregation (CA) as they do not account for the different carrier groups and power amplifiers associated with each component carrier, leading to suboptimal transmission power allocation.
Innovation Solution
The proposed solution involves adjusting UCI multiplexing rules based on carrier groups or power amplifier associations in inter-band UL CA. If the PUCCH and PUSCH are in different carrier groups, the UCI is transmitted in the PUCCH to maximize Tx power. If they are in the same carrier group, the UCI is multiplexed with the PUSCH and the PUCCH transmission is dropped to maximize PUSCH Tx power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional UCI multiplexing rules are applied in inter-band carrier aggregation, then the transmission process is simple, but the transmission power allocation is suboptimal and reliability is reduced
Solution Approach 1:
The patent segments the carrier aggregation into different carrier groups (first carrier group and second carrier group) with different prioritization rules. When PUCCH and PUSCH overlap, the system determines which carrier group to prioritize based on configuration, allowing optimized power allocation for UCI transmission in specific carrier groups while maintaining simpler handling in others.
Solution Approach 2:
The patent applies different multiplexing prioritization rules to different carrier groups locally. The first carrier group is configured with higher prioritization for UCI transmission, while the second carrier group uses different rules. This local differentiation optimizes UCI reliability in the first carrier group without unnecessarily complicating all carrier groups.
2Reliability
If UCI is always transmitted in PUCCH when overlapping with PUSCH, then UCI transmission is prioritized, but PUSCH transmission power is reduced
Solution Approach 1:
The patent implements dynamic prioritization where the system can flexibly determine whether to prioritize UCI in PUCCH or data in PUSCH based on carrier group configuration and current transmission conditions. This dynamic approach allows the system to optimize power allocation in real-time rather than always prioritizing UCI, thus balancing UCI reliability with PUSCH power availability.
3Power
If UCI is always multiplexed with PUSCH when overlapping, then PUSCH power is maintained, but UCI transmission reliability is reduced
Solution Approach 1:
The patent applies different multiplexing prioritization rules to different carrier groups locally. The first carrier group is configured with higher prioritization for UCI transmission, while the second carrier group uses different rules. This local differentiation optimizes UCI reliability in the first carrier group without unnecessarily complicating all carrier groups.
Data Source
AI summary
Aspects are provided which allow a UE to apply power-efficient UCI multiplexing rules accounting for situations in which CCs of overlapping PUCCH and PUSCH are in different carrier groups during inter-band CA to result in improved transmission performance. The UE transmits UCI in a PUCCH in a first CC in response to the PUCCH overlapping in time with a PUSCH in a second CC and the first CC being associated with a different carrier group than the second CC. Alternatively, the UE transmits UCI in the PUSCH in the second CC in response to the PUCCH overlapping in time with the PUSCH and the first CC being associated with a same carrier group as the second CC. Furthermore, the UE may apply a diversity scheme for UCI transmissions to achieve improved reliability of UCI feedback. The UE may also indicate which carrier includes UCI based on different DMRS configurations.