Joint HARQ-ACK Codebook for Multi-TRP PDSCH Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently configuring and managing hybrid automatic repeat request-acknowledgement (HARQ-ACK) feedback, particularly in multi-TRP scenarios, which affects the seamless provision of diverse services in 5G communication systems.
Innovation Solution
A method and apparatus for transmitting and receiving HARQ-ACK feedback by a terminal, involving the reception of PDSCHs from multiple TRPs and constructing a joint HARQ-ACK codebook based on different downlink control information (DCI) to efficiently manage HARQ-ACK bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK feedback is transmitted separately for each TRP, then feedback reliability is improved, but device complexity and overhead increase
Solution Approach 1:
The patent merges HARQ-ACK feedback from multiple TRPs into a single joint codebook structure. The terminal constructs one unified HARQ-ACK codebook that includes feedback bits for all TRPs, transmitting feedback through a single PUCCH resource rather than separate transmissions for each TRP. This reduces the number of separate feedback channels while maintaining the ability to report status from multiple TRPs.
Solution Approach 2:
The joint HARQ-ACK codebook is segmented into distinct feedback bit regions corresponding to different TRPs. Each TRP's feedback status is represented by dedicated bits within the unified codebook structure, allowing the terminal to organize and transmit feedback from multiple TRPs in a structured, segmented manner within a single transmission.
2Device complexity
If a joint HARQ-ACK codebook is used for multiple TRPs, then device complexity is reduced, but feedback processing time increases
Solution Approach 1:
The patent applies preliminary action by having the terminal prepare and construct the joint HARQ-ACK codebook in advance before the actual feedback transmission. The terminal determines the codebook structure and organizes feedback bits for multiple TRPs ahead of time, then transmits the complete codebook in a single PUCCH transmission, reducing the processing time during the feedback transmission phase.
3Reliability
If separate PUCCH resources are allocated for each TRP, then feedback reliability is improved, but loss of energy increases
Solution Approach 1:
The patent merges multiple separate PUCCH resource allocations into a single shared PUCCH resource for transmitting joint HARQ-ACK feedback from multiple TRPs. By consolidating the feedback transmission into one resource, the terminal reduces the total energy consumption associated with multiple separate transmissions while still maintaining the ability to report accurate feedback status for each TRP through the unified codebook structure.
Data Source
AI summary
Provided is a method, performed by a terminal, for transmitting hybrid automatic repeat request-acknowledgement (HARQ-ACK) information in a wireless communication system, the method including: receiving a first physical downlink shared channel (PDSCH) from a first transmission and reception point (TRP) and receiving a second PDSCH from a second TRP; and transmitting at least one HARQ-ACK codebook including first HARQ-ACK bits for the first PDSCH and second HARQ-ACK bits for the second PDSCH, wherein the first PDSCH and the second PDSCH are joint-transmitted from the first TRP and the second TRP, based on different pieces of downlink control information (DCI).