Multi-TRP PDSCH HARQ-ACK Codebook Segmentation
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Solution Overview
Problem
Current wireless communication systems face challenges in supporting multi-TRPs (transmission reception points) for efficient PDSCH transmission and reception, HARQ-ACK information, and DCI transmission, leading to reliability and ambiguity issues.
Innovation Solution
The implementation of a method and apparatus that utilize multi-TRPs for transmitting and receiving PDSCH, HARQ-ACK information, and DCI, ensuring reliable and robust communication by clarifying the operation of HARQ-ACK codebooks and DCI transmission across multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-TRP transmission is implemented for PDSCH and DCI, then reliability and robustness are improved, but device complexity and operational ambiguity increase
Solution Approach 1:
The patent segments the HARQ-ACK codebook into multiple separate codebooks, with each codebook corresponding to a specific TRP. This segmentation allows the UE to independently manage and report HARQ-ACK information for each TRP, reducing the complexity of managing unified codebooks across multiple TRPs while maintaining reliable transmission through diversified reporting paths.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple HARQ-ACK codebooks for different TRPs before transmission begins. Each codebook is associated with specific downlink assignments from particular TRPs, allowing the system to establish clear reporting structures in advance, thereby reducing operational ambiguity during actual transmission and reception processes.
2Productivity
If multiple HARQ-ACK information are multiplexed in a single codebook, then transmission efficiency is improved, but ambiguity in operation occurs
Solution Approach 1:
Instead of multiplexing all HARQ-ACK information into a single codebook, the patent segments them into multiple separate codebooks, each dedicated to specific TRPs. This segmentation prevents ambiguity about which TRP each HARQ-ACK bit corresponds to, while still achieving efficient transmission by organizing related acknowledgments together in their respective codebooks.
Solution Approach 2:
The patent applies local quality by assigning specific characteristics to each HARQ-ACK codebook based on its associated TRP. Each codebook has localized properties such as specific downlink assignment associations and reporting configurations, which eliminates operational ambiguity while maintaining efficient targeted transmission for each TRP's data stream.
3Reliability
If DCI is repetitively transmitted among multiple DCI corresponding to a HARQ-ACK codebook, then robustness is improved, but ambiguity in HARQ-ACK operation cannot be avoided
Solution Approach 1:
The patent segments repetitive DCI transmissions by associating each DCI with a specific HARQ-ACK codebook and TRP. When DCI is repetitively transmitted, the UE can identify which codebook each transmission corresponds to based on the segmented structure, maintaining robustness through repetition while avoiding ambiguity through clear codebook-to-TRP mappings.
Solution Approach 2:
The patent introduces HARQ-ACK codebooks as intermediaries between repetitive DCI transmissions and the final HARQ-ACK reporting. Each codebook acts as a mediator that organizes and identifies transmissions from specific TRPs, allowing repetitive DCI to be robustly transmitted while the intermediary codebook structure prevents ambiguity in the final acknowledgment process.
Data Source
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AI summary
Disclosed are a method and a device for PDSCH transmission or reception in a wireless communication system. According to an embodiment of the present disclosure, a method for transmitting hybrid-automatic repeat and request (HARQ)-acknowledgement (ACK) information may comprise the steps of: receiving, from a base station, downlink control information (DCI) for scheduling of a physical downlink shared channel (PDSCH) in a physical downlink control channel (PDCCH); receiving the PDSCH from the base station; and transmitting an HARQ-ACK codebook including HARQ-ACK information for the PDSCH to the base station. The PDCCH may be repeatedly transmitted in a plurality of monitoring occasions (MOs), and a parameter related to the HARQ-ACK codebook may be determined on the basis of the most advanced MO among the plurality of MOs.