Shortened PUSCH UCI Mapping for Reliable HARQ Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently mapping uplink control information (UCI) on shortened physical uplink shared channels (sPUSCH), particularly in terms of resource element allocation and reliability for hybrid automatic repeat request (HARQ) procedures, which affect latency and processing efficiency.
Innovation Solution
The proposed solution involves mapping UCI to resource elements within sPUSCH based on specific rules that prioritize and puncture resources as needed for ACK/NACK data, while providing fixed starting positions for RI and CQI data, ensuring reliable and efficient transmission on sPUSCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UCI is mapped to resource elements in sPUSCH using conventional methods, then resource allocation is provided, but reliability for HARQ procedures is insufficient
Solution Approach 1:
The patent segments UCI into different types (ACK/NACK, RI, CQI/PMI) and allocates them to different resource element positions within the sPUSCH. ACK/NACK is mapped to REs nearest the DM-RS symbol, while RI and CQI/PMI are mapped to REs at the front of symbols. This segmentation allows optimized reliability for different UCI types while maintaining efficient processing.
Solution Approach 2:
The patent establishes predetermined mapping rules for UCI on sPUSCH before transmission occurs. The mapping positions for different UCI types are determined in advance based on the sPUSCH format and DM-RS symbol location, enabling the UE to efficiently map UCI without complex real-time decisions, thus improving both reliability and processing efficiency.
2Adaptability or versatility
If resource elements are allocated for UCI on sPUSCH, then transmission capacity is provided, but mapping complexity increases
Solution Approach 1:
The patent applies different mapping strategies to different types of UCI based on their specific requirements. ACK/NACK uses a mapping strategy optimized for reliability (nearest to DM-RS), while RI and CQI/PMI use strategies optimized for their respective needs (front of symbols). This local quality approach provides adaptability for different UCI types while keeping the overall mapping process systematic and manageable.
Solution Approach 2:
The patent adjusts mapping parameters based on the sPUSCH format and the position of the DM-RS symbol. The mapping rules change depending on whether the sPUSCH contains one or two data symbols and where the DM-RS is located, providing flexibility while maintaining clear, rule-based mapping procedures that limit complexity.
3Reliability
If ACK/NACK data is prioritized in UCI mapping, then HARQ reliability is improved, but resource allocation for other UCI types is reduced
Solution Approach 1:
The patent segments the sPUSCH resource elements into different regions for different UCI types. ACK/NACK is allocated REs nearest the DM-RS symbol, while RI and CQI/PMI are allocated REs at the front of symbols. This segmentation ensures ACK/NACK receives sufficient resources for high reliability while other UCI types also obtain adequate resource allocation in their designated regions.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. A UE may configure a physical uplink shared channel (PUSCH) using shortened transmission time intervals (sTTIs), which may be referred to as a shortened PUSCH (sPUSCH), to transmit uplink control information (UCI) to a base station or other wireless device. The UE may use mapping rules, which may be based at least in part on a number of data symbols included in the sPUSCH, to map different types of UCI to different resource elements (REs) within the sPUSCH. A base station or other wireless device may use mapping rules, which may be based at least in part on a number of data symbols included in an sPUSCH, to determine one or more REs within the sPUSCH to monitor for different types of UCI.