HARQ-ACK Codebook Prioritization for Multi-TRP Synchronization
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Solution Overview
Problem
In communication systems with multiple transmission reception points (TRPs), synchronizing TRPs and sharing channel state information (CSI) is challenging, necessitating improved methods for coherent communication.
Innovation Solution
A method for a terminal to receive and transmit HARQ-ACK codebooks with prioritized fields, arranging them within a HARQ-ACK bitstream based on downlink control information (DCI) to facilitate efficient communication with multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple HARQ-ACK codebooks are transmitted together in a single uplink slot, then communication efficiency is improved, but the complexity of managing prioritized fields and codebook arrangements increases
Solution Approach 1:
The patent segments multiple HARQ-ACK codebooks into separate transmit opportunities (first codebook in first opportunity, second codebook in second opportunity) rather than transmitting all codebooks simultaneously in a single slot. This segmentation reduces the immediate management complexity while maintaining communication efficiency through coordinated multi-slot transmission.
Solution Approach 2:
The patent establishes preliminary arrangements for codebook transmission by pre-defining the order and structure of prioritized fields within each codebook before transmission. The terminal prepares the codebooks with properly ordered prioritized fields in advance, and the base station is pre-configured to expect this specific arrangement, reducing real-time management complexity.
2Reliability
If HARQ-ACK codebooks with multiple prioritized fields are transmitted, then synchronization and CSI sharing among TRPs are improved, but the complexity of field identification and arrangement increases
Solution Approach 1:
The patent applies local quality by assigning different priority levels to different fields within the HARQ-ACK codebook structure. Each prioritized field is tagged with its specific priority level, allowing the base station to selectively process fields based on their local importance for synchronization and CSI sharing without needing to manage the entire codebook structure uniformly.
Solution Approach 2:
The patent reduces field identification complexity by pre-arranging prioritized fields in a predetermined order within each codebook before transmission. The terminal prepares the codebooks with fields already sorted by priority, and the base station is pre-configured to expect this specific arrangement, eliminating the need for complex real-time field identification and reordering.
Data Source
AI summary
A method of a terminal may comprise: receiving, from a base station, DCI including a first field indicating HARQ-ACK retransmission and a second field indicating a priority; identifying first HARQ-ACK information having a priority identical to the priority indicated by the second field; and transmitting, to the base station, a first HARQ-ACK codebook including the first HARQ-ACK information based on the indication of the first field.