HARQ-ACK Codebook Merging Across Conflicting PUCCH Resources
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Solution Overview
Problem
In scenarios where time domain resources of uplink channels with different priorities overlap, the transmission of low-priority channels is canceled, leading to potential loss of HARQ-ACK information, and existing methods do not specify how to construct the HARQ-ACK codebook for transmission on non-conflicting resources.
Innovation Solution
A method where a terminal device cancels the transmission of a first PUCCH and transmits a second PUCCH carrying a HARQ-ACK codebook that includes HARQ-ACK information corresponding to a second downlink signal, with specific modes for constructing the codebook based on semi-static configuration or DAI to ensure all relevant information is transmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission of low-priority uplink channel is canceled when time domain resources overlap, then high-priority channel transmission is ensured, but HARQ-ACK information may be lost
Solution Approach 1:
The patent merges the HARQ-ACK information from the canceled low-priority PUCCH into the high-priority PUCCH transmission. Specifically, when a low-priority PUCCH carrying HARQ-ACK information overlaps with a high-priority PUCCH in time domain resources, the low-priority transmission is canceled but its HARQ-ACK information is included in the high-priority PUCCH's HARQ-ACK codebook, ensuring no information is lost while maintaining high-priority transmission reliability
Solution Approach 2:
The high-priority PUCCH acts as an intermediary carrier that transports both its own HARQ-ACK information and the HARQ-ACK information from the canceled low-priority PUCCH. The HARQ-ACK codebook serves as the intermediary structure that consolidates multiple HARQ-ACK information sources into a single transmission unit
2Loss of information
If HARQ-ACK information from canceled low-priority channel is retransmitted on non-conflicting resources, then information completeness is improved, but transmission complexity increases
Solution Approach 1:
The patent extracts only the essential HARQ-ACK information from the canceled low-priority PUCCH and incorporates it into the high-priority PUCCH transmission. This selective extraction approach ensures information completeness without requiring full retransmission of the canceled channel, thereby reducing transmission complexity
Solution Approach 2:
The high-priority PUCCH is designed to perform multiple functions: transmitting its own HARQ-ACK information and simultaneously carrying the HARQ-ACK information from the canceled low-priority PUCCH. This multi-functionality eliminates the need for separate retransmission resources, simplifying the overall transmission management
3Ease of operation
If the content in canceled low-priority uplink channel is not transmitted, then transmission conflict is avoided, but HARQ-ACK information is lost
Solution Approach 1:
The patent combines the HARQ-ACK information from the canceled low-priority PUCCH with the high-priority PUCCH transmission by incorporating it into the HARQ-ACK codebook. This merging ensures that no HARQ-ACK information is lost while avoiding transmission conflicts, as the information is carried on the high-priority resource that does not conflict with other transmissions
Data Source
AI summary
A control information transmission method and apparatus, and a terminal device. A terminal device receives a first downlink signal, hybrid automatic repeat request-acknowledgement (HARQ-ACK) information corresponding to the first downlink signal being transmitted by means of a first physical uplink control channel (PUCCH); the terminal device receives a second downlink signal, HARQ-ACK information corresponding to the second downlink signal being transmitted by means of a second PUCCH. The second PUCCH and the first PUCCH correspond to a same HARQ-ACK codebook; and the terminal device cancels the transmission of the first PUCCH and transmits the second PUCCH, the second PUCCH carrying a first HARQ-ACK codebook, and the first HARQ-ACK codebook at least comprising the HARQ-ACK information corresponding to the second downlink signal.