HARQ-ACK Feedback Multiplexing in Wireless Uplink Carrier Aggregation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for an efficient method to transmit Hybrid Automatic Retransmission Request Acknowledgment (HARQ-ACK) feedback information for multicast and unicast physical downlink shared channels (PDSCH) in wireless communication systems, particularly in scenarios involving uplink carrier aggregation and supplementary uplink carriers, to ensure accurate and reliable transmission with minimal resource usage.
Innovation Solution
The method involves determining the appropriate uplink serving cell or carrier for transmitting HARQ-ACK information based on explicit or implicit indications, utilizing power control parameters, and ensuring proper timing and resource allocation to multiplex HARQ-ACKs for multicast and unicast PDSCHs, while avoiding conflicts and optimizing transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK feedback for multicast and unicast PDSCH is transmitted using separate resources, then transmission reliability is improved, but resource usage and system complexity increase
Solution Approach 1:
The patent combines HARQ-ACK feedback for both multicast and unicast PDSCH into a single PUCCH resource. The base station configures a unified PUCCH resource that can carry acknowledgment information for multiple downlink channels, thereby reducing resource overhead and simplifying system complexity while maintaining reliable feedback transmission through proper multiplexing of acknowledgment bits
2Measurement precision
If PUCCH resource is configured for HARQ-ACK transmission, then feedback accuracy is improved, but resource conflict increases when multiple PDSCHs are received
Solution Approach 1:
The patent implements dynamic resource selection where the UE determines which PUCCH resource to use based on the timing relationship between received PDSCHs and available PUCCH opportunities. When multiple PDSCHs are received, the system dynamically selects appropriate PUCCH resources based on slot offsets and timing configurations, avoiding static resource allocation conflicts while maintaining accurate feedback transmission
3Reliability
If power control parameters are optimized for HARQ-ACK transmission, then uplink coverage is improved, but power consumption increases
Solution Approach 1:
The patent optimizes power control parameters specifically for HARQ-ACK transmission by adjusting pathloss reference signals and power offset values. The base station configures appropriate pathlossReferenceSignal and p0-PUCCH parameters that ensure sufficient uplink coverage for acknowledgment transmission while minimizing unnecessary power consumption through optimized power levels matched to actual channel conditions
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure relates to a method and an apparatus for transmitting hybrid automatic retransmission request acknowledgement (HARQ-ACK) feedback information.