UCI Piggyback on PUSCH via Segmented ACK Mapping
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing uplink control information (UCI) transmission, particularly in multiplexing UCI with physical uplink shared channel (PUSCH), which affects decoding performance and resource allocation due to varying ACK payload sizes and potential misunderstandings between user equipment (UE) and base stations.
Innovation Solution
A resource mapping rule is introduced for UCI piggybacking on PUSCH, where the mapping of ACK and channel state information (CSI) is dependent on payload size, with options for puncturing or rate-matching based on ACK bits, and additional DMRS symbols are used for improved channel estimation, especially at high Doppler conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UCI is piggybacked on PUSCH with large ACK payload size, then UCI transmission is achieved, but decoding performance of PUSCH deteriorates due to puncturing impact
Solution Approach 1:
The patent segments the ACK payload into two parts: first ACK bits (ack1) that puncture the PUSCH, and second ACK bits (ack2) that are rate-matched around the PUSCH. This segmentation allows the system to accommodate large ACK payload sizes while minimizing the impact on PUSCH decoding performance by distributing the puncturing effect across different portions of the transmission.
Solution Approach 2:
The patent applies different mapping strategies to different parts of the ACK payload based on their local characteristics. The first ACK bits use puncturing mapping for efficient transmission, while the second ACK bits use rate-matching mapping to protect against decoding failures. This local differentiation optimizes the balance between UCI transmission efficiency and PUSCH decoding reliability.
2Quantity of substance
If ACK payload size increases, then more UCI information is transmitted, but resource allocation becomes more complex and error-prone
Solution Approach 1:
The patent dynamically adapts the resource mapping strategy based on the ACK payload size. When the ACK payload is large, the system switches from uniform puncturing to a two-part strategy with different mapping methods for different ACK bit segments. This dynamic adaptation simplifies resource allocation by providing clear rules for handling varying payload sizes without increasing overall system complexity.
3Productivity
If puncturing is used for ACK transmission, then UCI is efficiently transmitted, but channel estimation accuracy deteriorates especially at high Doppler conditions
Solution Approach 1:
The patent segments the ACK transmission into two parts with different handling methods. The first ACK bits use puncturing for efficiency, while the second ACK bits use rate-matching that preserves channel estimation accuracy. This segmentation allows the system to maintain both transmission efficiency and estimation accuracy by applying appropriate methods to appropriate segments.
Solution Approach 2:
The patent provides beforehand cushioning for channel estimation by including rate-matched ACK bits that do not puncture the PUSCH resources. These cushioning bits ensure that even when puncturing is applied to other ACK bits, the channel estimation remains accurate enough for reliable decoding, especially under high Doppler conditions where estimation accuracy is critical.
Data Source
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AI summary
Certain aspects of the present disclosure relate to methods and apparatus relating to an RE mapping rule for UCI piggyback on PUSCH. For example, a method may include determining a set of uplink resources to use for transmitting acknowledgment (ACK) information in a physical uplink shared channel (PUSCH) transmission, wherein the determination is based at least in part on a payload size of the ACK information, and transmitting the ACK information using the determined set of uplink resources.