ACK/NACK Bit Mapping in Wireless Uplink Control
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting uplink signals, particularly for Cellular IoT (CIoT) user equipment, due to limitations in resource allocation and acknowledgement (ACK) signal transmission, which affect data throughput and reliability in multi-node systems.
Innovation Solution
A method for transmitting ACK-related information involves designating specific symbols in a resource allocation unit for ACK/NACK transmission, dividing the unit into symbol regions, and sequentially mapping ACK/NACK bits to these regions, allowing for contiguous bit mapping across different symbol regions, with options for configuration based on modulation schemes, scheduling units, and higher layer signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ACK/NACK bits are mapped to specific symbols in resource allocation unit, then transmission reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The resource allocation unit is divided into multiple symbol regions, and ACK/NACK bits are sequentially mapped to different symbol regions. This segmentation allows reliable transmission by distributing acknowledgment bits across multiple time-frequency resources while maintaining manageable allocation complexity through structured division.
Solution Approach 2:
Specific symbols are pre-designated for ACK/NACK transmission within the resource allocation unit before actual data transmission occurs. This preliminary designation of acknowledgment resources ensures that reliable feedback channels are established in advance, improving transmission reliability without adding complexity during real-time operation.
2Productivity
If contiguous bits are mapped to different symbol regions, then resource utilization efficiency is improved, but mapping complexity increases
Solution Approach 1:
Contiguous ACK/NACK bits are mapped to different symbol regions by transitioning from a single-dimension sequential mapping to a multi-dimensional mapping approach that utilizes both time (different symbols) and frequency (different regions) dimensions. This improves resource utilization by efficiently packing contiguous bits into distributed symbol regions while the structured dimensional approach keeps mapping complexity manageable.
Data Source
AI summary
A method for transmitting an acknowledgement (ACK)-related information in a method for transmitting uplink control information in a wireless communication system includes: designating specific symbols in a resource allocation unit for ACK/NACK (acknowledgement/negative-acknowledgement) transmission within an uplink data channel; dividing the resource allocation unit into a plurality of symbol regions; sequentially mapping ACK/NACK bits to the plurality of symbol regions; and transmitting the uplink data channel to which the ACK/NACK bits are mapped, wherein the mapping includes mapping contiguous bits of the ACK/NACK bits to different symbol regions of the plurality of symbol regions.