UL CA PUSCH Selection for Flexible HARQ-ACK Multiplexing
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently multiplexing hybrid automatic repeat request (HARQ) acknowledgments (ACK) on physical uplink shared channels (PUSCH) due to restrictions in PUSCH selection based on grant type and component carrier index, leading to overlapping and inefficient resource utilization.
Innovation Solution
A method and apparatus at both user equipment (UE) and network entities are configured to select and multiplex UCI bits with multiple PUSCHs, allowing for flexible HARQ-ACK multiplexing based on UL grants with total downlink assignment index (tDAI) values, enabling efficient transmission and reception of UCI bits across multiple PUSCHs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If PUSCH selection is restricted based on grant type and component carrier index, then device complexity is reduced, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the PUSCH selection criteria flexible and adaptable rather than fixed. The UE can dynamically select from multiple PUSCHs based on current channel conditions, buffer status, and scheduling requirements, allowing the system to optimize resource utilization in real-time while managing complexity through structured selection rules.
Solution Approach 2:
The patent segments the PUSCH selection process into distinct phases and criteria: identifying candidate PUSCHs, applying selection rules based on grant type and component carrier index, and final selection. This segmentation allows the system to manage complexity by breaking down the decision-making process into manageable steps while still achieving efficient resource utilization.
2Productivity
If multiple PUSCHs are multiplexed with UCI bits, then resource utilization is improved, but overlapping and interference issues worsen
Solution Approach 1:
The patent applies local quality by allowing different PUSCHs to have different characteristics and roles in the multiplexing process. Each PUSCH can be optimized for specific purposes (e.g., some for data transmission, others for control information), and the selection criteria ensure that only compatible PUSCHs are multiplexed together, reducing interference while maintaining high resource utilization.
3Productivity
If flexible PUSCH selection is implemented, then resource utilization efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a PUSCH selection mechanism that can handle multiple scenarios and requirements through a unified framework. The same selection criteria and rules apply regardless of the specific situation, allowing the system to achieve flexible resource utilization without requiring separate complex mechanisms for different cases, thus managing device complexity effectively.
Data Source
AI summary
To enable HARQ-ACK multiplexing on PUSCH in UL CA, methods, apparatuses, and computer readable medium are provided. An example method includes selecting at least one of a plurality of PUSCHs in which to multiplex one or more UCI bits, one or more of the plurality of PUSCHs being associated with one or more UL grants, the one or more UL grants including one or more UL tDAI values. The example method further includes transmitting, to a network entity, the one or more UCI bits that are multiplexed with the at least one of the plurality of PUSCHs.