ACK/NACK Signal Transmission in Carrier Aggregation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly those employing carrier aggregation, existing methods face challenges in efficiently transmitting ACK/NACK signals across multiple component carriers, leading to reduced information transmission capacity and increased complexity.
Innovation Solution
A method for transmitting ACK/NACK signals involves receiving data blocks from multiple downlink component carriers, generating corresponding signals, and allocating resources independently per slot to transmit these signals through one uplink component carrier, utilizing PUCCH format 2 resources to minimize signal variation and enhance transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If ACK/NACK signals are transmitted across multiple component carriers using existing methods, then information transmission capacity is maintained, but device complexity and resource allocation complexity increase
Solution Approach 1:
The patent combines ACK/NACK signals from multiple component carriers into a single uplink component carrier for transmission. Instead of transmitting separate ACK/NACK signals on each downlink component carrier, the method consolidates these acknowledgments and transmits them together on one uplink carrier, thereby reducing resource allocation complexity while maintaining full information transmission capacity across all component carriers.
2Stability of the object's composition
If resources are allocated independently per slot for ACK/NACK transmission, then signal transmission consistency is improved, but resource allocation complexity increases
Solution Approach 1:
The patent divides the uplink transmission into separate slots, with each slot independently allocated resources for ACK/NACK signal transmission. This segmentation approach ensures that each slot maintains consistent signal transmission characteristics while the overall resource allocation remains manageable through systematic per-slot management rather than complex cross-slot coordination.
3Productivity
If PUCCH format 2 resources are utilized for ACK/NACK transmission, then transmission efficiency is enhanced, but adaptability to different signal variations is reduced
Solution Approach 1:
The patent utilizes PUCCH format 2 resources for ACK/NACK transmission by adjusting and optimizing transmission parameters such as resource allocation, modulation schemes, and power control settings. These parameter changes enable efficient use of the PUCCH format 2 structure while maintaining sufficient adaptability to handle different signal variations through dynamic parameter adjustment rather than structural modification.
Data Source
AI summary
A method of generating Acknowledgement/Negative Acknowledgement (ACK/NACK) information by a user equipment (UE) in a wireless communication system is discussed. The method includes receiving, by the UE from a base station (BS), a plurality of codewords through a plurality of downlink frequency bands related to a plurality of downlink carriers, wherein the UE is configured with a 1-codeword mode or a 2-codeword mode for each of the plurality of downlink frequency bands independently, and wherein a number of supported codewords is one for the 1-codeword mode or two for the 2-codeword mode; determining, by the UE, a total number of ACK/NACK bits, wherein the total number of ACK/NACK bits is determined based on a total number of the plurality of downlink carriers and the number of supported codewords; and generating, by the UE, a sequence of the ACK/NACK bits based on the total number of the ACK/NACK bits.