Simplified UCI Multiplexing for Reduced Capability User Equipments
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Solution Overview
Problem
Reduced capability user equipment (UEs) in wireless communications face challenges in efficiently performing uplink control information (UCI) multiplexing due to complex procedures that result in high power expenditure and resource constraints, especially when uplink control channels and shared channels overlap in time or across different component carriers.
Innovation Solution
A simplified UCI multiplexing procedure is implemented for reduced capability UEs, where they determine alignment of symbol periods between uplink control and shared channels to decide on multiplexing, dropping less prioritized channels, and transmitting on the highest priority channel, thereby avoiding complex time checks and cross-component carrier multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reduced capability UEs perform complex UCI multiplexing procedures when PUCCH and PUSCH overlap, then system reliability is maintained, but power consumption increases and resource constraints are exacerbated
Solution Approach 1:
The patent segments the UCI multiplexing procedure into distinct cases based on timing alignment and component carrier relationships. When PUCCH and PUSCH are timing-aligned on the same component carrier, the UE performs simplified multiplexing; when they are not aligned or on different carriers, the UE applies different handling rules. This segmentation allows the UE to avoid complex procedures when unnecessary, reducing power consumption while maintaining reliability when needed.
Solution Approach 2:
The patent changes the operational parameters of the UCI multiplexing procedure based on detected conditions (timing alignment, component carrier identity). By dynamically adjusting the multiplexing approach according to these parameters, the system achieves optimal balance between reliability and power consumption for reduced capability UEs.
2Productivity
If reduced capability UEs perform cross-component carrier UCI multiplexing, then resource utilization is improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent segments cross-component carrier multiplexing into specific cases where it is beneficial. Rather than always performing complex cross-CC multiplexing, the UE determines whether PUCCH and PUSCH are on different component carriers and applies appropriate handling. This segmentation reduces device complexity while maintaining resource utilization efficiency.
Solution Approach 2:
The patent applies partial action by performing cross-component carrier multiplexing only when necessary (when PUCCH and PUSCH overlap on different CCs), rather than always performing full multiplexing procedures. This partial approach reduces processing requirements while still achieving resource utilization benefits when needed.
3Manufacturing precision
If reduced capability UEs perform detailed timing alignment checks before multiplexing, then multiplexing accuracy is improved, but processing time and complexity increase
Solution Approach 1:
The patent extracts the essential timing alignment check from the complex multiplexing procedure. Instead of performing detailed timing analysis, the UE only checks whether the first symbol periods of PUCCH and PUSCH are aligned. This extracted simplified check maintains sufficient multiplexing accuracy while dramatically reducing processing time and complexity for reduced capability UEs.
Solution Approach 2:
The patent applies partial action by performing only the necessary timing alignment check (first symbol period alignment) rather than comprehensive timing analysis. This partial check provides sufficient accuracy for multiplexing decisions while minimizing processing time and complexity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may determine whether to perform a simplified uplink control information (UCI) multiplexing procedure or select an overlapping uplink channel having the highest priority and drop the remaining overlapping uplink channels. The UE may determine that a first symbol period of the physical uplink scheduled channel (PUSCH) is aligned with a first symbol period of the physical uplink control channel (PUCCH) and the UE may multiplex UCI with an uplink data transmission. The UE may transmit the multiplexed UCI and uplink data on the PUSCH and drop the PUCCH. The UE may perform UCI multiplexing for overlapping PUCCH and PUSCH, located on the same component carrier (CC). The UE may refrain from performing UCI multiplexing if the PUSCH and the PUCCH are located on different CCs, and may simultaneously transmit UCI and uplink data over the different CCs.