Uplink Control Information Mapping for Symbol Power Balance
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently multiplexing uplink control information (UCI) with shared data on a shared channel, leading to power imbalance across symbols and reduced communication reliability and efficiency.
Innovation Solution
A time-first mapping scheme is employed for allocating UCI to resource elements, ensuring UCI symbols are placed non-overlapping in the time and frequency domains and adjacent to DMRS symbols, reducing power imbalance and improving channel estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UCI is multiplexed with shared data on uplink shared channel using conventional mapping schemes, then resource utilization is achieved, but power imbalance across symbols occurs and communication reliability deteriorates
Solution Approach 1:
The patent applies local quality by making different parts of the resource element allocation have different properties. Specifically, UCI symbols are placed in specific time-frequency locations that are non-overlapping with data symbols, and DMRS symbols are positioned adjacent to UCI symbols. This localized differentiation in resource allocation ensures that UCI transmission has dedicated resources with appropriate power levels, while data symbols use remaining resources, thereby resolving the power imbalance issue while maintaining multiplexing efficiency.
Solution Approach 2:
The patent employs asymmetry in the time-first mapping scheme where UCI symbols are allocated preferentially in the time domain before frequency domain allocation. This asymmetric allocation pattern, combined with placing DMRS symbols adjacent to UCI symbols rather than symmetrically around them, creates an uneven but optimized resource distribution that prioritizes UCI reliability while maintaining overall system throughput.
2Measurement precision
If UCI symbols are placed adjacent to DMRS symbols in time domain, then channel estimation accuracy is improved, but frequency domain overlap may occur
Solution Approach 1:
The patent resolves the conflict between channel estimation accuracy and UCI reliability by transitioning from a two-dimensional symmetric allocation around DMRS to a time-first mapping approach. In this approach, UCI symbols are first allocated in the time domain adjacent to DMRS symbols (improving channel estimation), then the frequency dimension is used to ensure non-overlapping allocation. This dimensional reordering allows both objectives to be satisfied simultaneously.
3Reliability
If time-first mapping scheme is used for UCI allocation, then power imbalance is reduced, but allocation complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the resource element allocation process into distinct stages: first allocating UCI symbols in the time domain, then allocating frequency resources, and finally positioning DMRS symbols adjacent to UCI. This segmented approach breaks down the complex allocation problem into manageable steps, making the time-first mapping scheme implementable with clear rules rather than requiring complex optimization algorithms.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A UE may allocate uplink control information (UCI) to symbols with a time-first mapping scheme to reduce power imbalance across symbols. The UE may generate UCI and may perform an allocation of the UCI as part of a multiplexing procedure for multiplexing the UCI with shared data for an uplink shared channel. For example, the UE may allocate the UCI to a set of resource elements associated with the uplink shared channel according to a time-first mapping scheme. Thus, the UE may transmit the uplink shared channel, including the UCI multiplexed with the shared data, based on the allocating. The time-first mapping scheme may be a time-first, frequency-next mapping scheme, where the UE may allocate the UCI to resource elements according to one or more rules.