ACK/NACK Signaling in Carrier Aggregation via PDCCH Order Information
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Solution Overview
Problem
In a carrier aggregation environment, existing wireless communication systems face challenges in effectively performing uplink ACK/NACK signaling, leading to errors when user equipment receives data through multiple component carriers.
Innovation Solution
The method involves providing a mechanism for the user equipment to accurately determine and transmit ACK/NACK information by receiving PDCCH number information and PDCCH order information, allowing it to recognize missing PDCCHs and correctly transmit ACK/NACK signals using PUCCH resources, thereby reducing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is used to increase data transmission capacity, then productivity is improved, but the complexity of ACK/NACK signaling increases and error rates worsen
Solution Approach 1:
The patent segments the ACK/NACK signaling process into distinct phases: PDCCH reception with order information, selective ACK/NACK generation based on received PDCCH count, and PUCCH transmission. This segmentation allows the system to handle multiple component carriers by processing each PDCCH individually with its order information, thereby maintaining reliability while supporting carrier aggregation for improved productivity.
2Productivity
If multiple PDCCHs are transmitted simultaneously across multiple component carriers, then productivity is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The patent applies preliminary action by embedding PDCCH order information in each transmitted PDCCH before the UE attempts detection. This order information serves as a reference that the UE uses to verify successful reception and to correctly sequence ACK/NACK responses. By preparing this reference information in advance, the system reduces the difficulty of detecting and measuring multiple simultaneous PDCCHs across carrier aggregation, while maintaining high productivity.
3Reliability
If ACK/NACK information is transmitted for every PDCCH received, then reliability is improved, but the device complexity increases
Solution Approach 1:
The patent implements partial action by having the UE transmit ACK/NACK information selectively based on whether PDCCH order information is successfully detected, rather than for every possible PDCCH. The UE compares the received PDCCH count with the order information and only generates ACK/NACK for successfully received PDCCHs. This approach maintains reliability by ensuring accurate ACK/NACK transmission while reducing device complexity by avoiding unnecessary processing and transmission for undetected or missed PDCCHs.
Data Source
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AI summary
A method of transmitting control information by an apparatus in a wireless communication system, the method comprising: receiving one or more physical downlink control channels, PDCCHs, for one or more downlink data in a PDCCH monitoring occasion via multiple component carriers, wherein each of the one or more control channels carries same information related with a total number of scheduled control channels in the PDCCH monitoring occasion; and transmitting acknowledgement/negative acknowledgement, ACK/NACK, information for the one or more downlink data based on the information.