HARQ-ACK Codebook Retransmission Across CORESET Pools in Multi-TRP
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook retransmissions for multiple downlink control information (multi-DCI) in multiple transmit-receive points (multi-TRP) environments, leading to inefficiencies in data transmission and reception.
Innovation Solution
The method involves receiving and transmitting HARQ-ACK codebooks across different CORESET pool indices, allowing for the scheduled retransmission of HARQ-ACK codebooks in specific slots, thereby optimizing data transmission and reception in multi-TRP scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK codebook retransmission is implemented for multi-DCI based multi-TRP, then reliability of data transmission is improved, but device complexity increases due to managing multiple CORESET pool indices and codebook associations
Solution Approach 1:
The patent segments the HARQ-ACK codebook management by associating each CORESET pool index with a specific codebook type (first codebook for first pool, second codebook for second pool). This segmentation allows the UE to independently manage feedback for different TRPs, improving reliability through dedicated codebooks while reducing overall complexity by organizing management tasks into separate, manageable segments rather than a single unified system.
Solution Approach 2:
The patent introduces the DCI message as an intermediary that carries explicit indications of which HARQ-ACK codebook should be transmitted. This intermediary mechanism mediates between the multiple CORESET pool indices and the HARQ-ACK feedback, allowing the network to dynamically control codebook selection without requiring the UE to maintain complex internal state machines, thus improving reliability while managing device complexity.
2Reliability
If separate HARQ-ACK codebooks are maintained for different CORESET pool indices, then communication quality is improved, but loss of time increases due to additional processing and transmission overhead
Solution Approach 1:
The patent applies preliminary action by pre-configuring the association between CORESET pool indices and HARQ-ACK codebooks before actual data transmission begins. The UE is pre-informed of which codebook corresponds to which pool index through higher-layer signaling, so that during actual operation, the UE can quickly identify and transmit the appropriate codebook without performing complex real-time analysis, thus improving communication quality while minimizing processing time overhead.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, in a control resource set (CORESET) associated with a first CORESET pool index or a second CORESET pool index, downlink control information (DCI) including an indication that a hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook scheduled in a first slot is to be retransmitted in a second slot. The UE may transmit, in the second slot and in connection with receiving the DCI, a first HARQ-ACK codebook associated with the first CORESET pool index or a second HARQ-ACK codebook associated with the second CORESET pool index. Numerous other aspects are described.