HARQ-ACK Codebook Construction via DCI Retransmission Indication
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Solution Overview
Problem
Current wireless communication systems face challenges in effectively constructing and managing HARQ-ACK codebooks, particularly in handling HARQ-ACK retransmissions, which can lead to confusion and errors due to missed DCI and corresponding missed HARQ-ACK feedback.
Innovation Solution
The method involves detecting DCI formats indicating HARQ-ACK retransmissions, constructing HARQ-ACK codebooks based on these indications, and transmitting them in specific slots, allowing for flexible retransmission of canceled HARQ-ACK feedback to ensure accurate communication and avoid confusion between user equipment and network entities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK feedback is retransmitted without clear indication of transmission occasions, then retransmission reliability is improved, but confusion and errors occur between UE and network entities
Solution Approach 1:
The patent implements a feedback mechanism where the network entity sends DCI indications to the UE specifying which HARQ-ACK transmission occasions were canceled and require retransmission. The UE then provides feedback based on these indications, creating a closed-loop communication that eliminates confusion about which transmissions need retransmission, thereby improving reliability without causing information loss.
Solution Approach 2:
The network entity performs preliminary action by sending cancellation indications and retransmission occasion specifications to the UE before the actual retransmission occurs. This advance notification allows the UE to prepare the correct HARQ-ACK codebook for retransmission, preventing confusion and ensuring accurate information exchange.
2Measurement precision
If DCI formats include detailed indications of HARQ-ACK transmission occasions, then communication accuracy is improved, but DCI format complexity increases
Solution Approach 1:
The patent segments the HARQ-ACK codebook into multiple parts, each corresponding to specific transmission occasions indicated by DCI formats. This segmentation allows the DCI to efficiently indicate only the relevant portions that need retransmission rather than managing the entire codebook, thereby maintaining high accuracy while controlling complexity through structured organization.
Solution Approach 2:
The patent implements dynamic HARQ-ACK codebook construction where the codebook structure and content are adapted based on network conditions and retransmission requirements. The DCI formats dynamically indicate which specific occasions require retransmission, allowing the system to maintain precision while adjusting complexity according to actual needs rather than using a fixed complex structure.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for constructing a HARQ-ACK codebook. One method (500) includes detecting (502) a DCI format including DCI indicating HARQ-ACK retransmission. The DCI indicating HARQ-ACK retransmission includes an indication of at least one HARQ-ACK transmission occasion for retransmission. The method (500) includes constructing (504) a HARQ-ACK codebook based on the indication of the at least one HARQ-ACK transmission occasion for retransmission. The method (500) includes transmitting (506) the HARQ-ACK codebook in a first slot.