Uplink Control Information Transmission in TDD Carrier Aggregation
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting control information, particularly in time division duplex (TDD) systems, where managing uplink control information and resources is challenging due to complexities in HARQ-ACK bit determination and subframe configurations.
Innovation Solution
A method and apparatus for determining the number of per-cell HARQ-ACK bits in a wireless communication system supporting carrier aggregation and TDD, using specific formulas based on UL-DL configuration indices to optimize HARQ-ACK payload transmission through the physical uplink shared channel (PUSCH), ensuring efficient resource management for uplink control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of HARQ-ACK bits is determined using fixed formulas without considering UL-DL configuration, then the resource management is simple, but the transmission efficiency deteriorates due to improper bit allocation
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the number of HARQ-ACK bits based on the UL-DL configuration index. Different configuration indices (0-5) correspond to different numbers of downlink subframes, which directly determines the number of HARQ-ACK bits needed. This dynamic parameter adjustment optimizes transmission efficiency while managing complexity through standardized lookup tables.
Solution Approach 2:
The patent implements dynamics by making the HARQ-ACK bit determination adaptive to changing UL-DL configurations. Instead of using fixed formulas, the system dynamically selects the appropriate number of bits based on the current configuration index, allowing efficient resource management across different TDD scenarios.
2Adaptability or versatility
If carrier aggregation is supported with multiple cells having different UL-DL configurations, then the system versatility improves, but the HARQ-ACK bit determination becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the HARQ-ACK bit determination into per-cell calculations. Each cell's contribution to the total HARQ-ACK bits is calculated independently based on its specific UL-DL configuration, then summed across all cells. This segmentation makes the complex multi-cell problem manageable through modular computation.
Solution Approach 2:
The patent implements universality by creating a unified method that handles both single-cell and multi-cell scenarios with different UL-DL configurations through the same fundamental approach. The per-cell bit calculation formula works universally across all cell types, making the system adaptable to various carrier aggregation configurations without requiring separate handling for each case.
Data Source
AI summary
The present invention relates to a wireless communication system. More particularly, the present invention relates to a method and an apparatus for transmitting uplink control information in the wireless communication system, which supports carrier aggregation and operates by a TDD, and comprises the steps of: deciding HARQ-ACK bit numbers for each cell from a plurality of cells; composing a HARQ-ACK payload comprising HARQ-ACK bit(s) for each of the plurality of cells; and transmitting the HARQ-ACK payload from a subframe n through a PUSCH.