HARQ-ACK Codebook Ordering for SPS PDSCH Transmission
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Solution Overview
Problem
The increasing number of user equipment (UEs) and data volume in wireless communication systems pose challenges in efficiently using limited radio resources, particularly in managing high-density nodes and UEs, and in reducing latency for applications sensitive to delay.
Innovation Solution
A method for generating and transmitting a hybrid automatic repeat request acknowledgment (HARQ-ACK) codebook by user equipment, where HARQ-ACK bits for semi-persistent scheduling physical downlink shared channels are ordered based on slot indices and serving cell indices, optimizing the transmission to efficiently utilize limited radio resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of UEs and data volume increases to satisfy growing communication demands, then communication capacity and data throughput increase, but radio resources become more limited and harder to manage efficiently
Solution Approach 1:
The HARQ-ACK codebook is segmented and ordered based on slot indices and serving cell indices. This segmentation approach organizes the large volume of HARQ-ACK bits into a structured format, making resource management more efficient despite the increasing number of UEs and data volumes.
2Productivity
If more radio resources are allocated to handle increased data volume, then data throughput increases, but the efficiency of resource utilization decreases due to limited available resources
Solution Approach 1:
The HARQ-ACK codebook is pre-ordered according to slot indices and serving cell indices before transmission. This preliminary organization optimizes the transmission structure, enabling efficient resource utilization and reducing waste of limited radio resources while maintaining high data throughput.
3Ease of operation
If traditional HARQ-ACK codebook ordering is used, then transmission simplicity is maintained, but latency increases for delay-sensitive applications
Solution Approach 1:
The HARQ-ACK codebook ordering is dynamically optimized based on slot indices and serving cell indices. This dynamic ordering approach reduces latency for delay-sensitive applications while maintaining transmission simplicity through a systematic ordering method that can be efficiently implemented.
Data Source
AI summary
A user equipment generates an HARQ-ACK codebook comprising HARQ-ACK bits for semi-persistent scheduling (SPS) physical downlink shared channels (PDSCHs) based on multiple SPS configurations, and transmits the HARQ-ACK codebook. In the HARQ-ACK codebook, with respect to an SPS configuration index and a serving cell index, an HARQ-ACK bit for an SPS PDSCH in a slot of a lower slot index precedes an HARQ-ACK bit for an SPS PDSCH in a slot of a higher slot index, and with respect to each serving cell index, an HARQ-ACK bit for an SPS PDSCH based on an SPS configuration having a lower SPS configuration index precedes an HARQ-ACK bit for an SPS PDSCH based on an SPS configuration having a higher SPS configuration index.