HARQ-ACK Feedback Positioning for Low-Latency PDSCH Transmission
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Solution Overview
Problem
The existing technologies face challenges in reducing the delay of Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) feedback, particularly in Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) codebooks corresponding to Physical Downlink Shared Channels (PDSCH), limiting the timely transmission of HARQ-ACK feedback.
Innovation Solution
The method involves setting the position for HARQ-ACK transmission by a first communication node and enabling a second communication node to feedback HARQ-ACK corresponding to a Physical Downlink Shared Channel (PDSCH) in time, using parameters such as DCI, CRC bit generator polynomials, RNTI sequence scramblers, or PRI values to determine the appropriate PUCCH for HARQ-ACK transmission, allowing multiple transmission opportunities within an uplink unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the HARQ-ACK feedback mechanism uses a limited transmission chance per uplink unit, then the system maintains simpler resource allocation, but the HARQ-ACK feedback delay increases
Solution Approach 1:
The patent introduces dynamic HARQ-ACK transmission opportunities within an uplink unit by utilizing different PUCCH resource types (first type and second type). The system dynamically selects which PUCCH resource to use based on scheduling conditions, allowing multiple transmission chances within the same uplink unit. This dynamic approach reduces feedback delay while maintaining manageable resource allocation through structured resource types.
Solution Approach 2:
The patent segments the PUCCH resources into different types (first type PUCCH and second type PUCCH) with distinct characteristics and usage scenarios. By dividing the resource allocation into segmented types, the system enables multiple transmission opportunities without creating fully complex resource management. Each PUCCH type has specific rules for when it should be used, simplifying the overall allocation complexity while increasing transmission flexibility.
2Loss of time
If multiple PUCCH resources are configured for HARQ-ACK transmission, then the feedback latency is reduced, but the signaling overhead increases
Solution Approach 1:
The patent uses parameter changes in the DCI format (specifically the PUCCH resource indication field values) to indicate which PUCCH resource type should be used. By encoding resource selection information in existing DCI parameters rather than adding new signaling fields, the system enables multiple transmission opportunities while minimizing additional signaling overhead. The parameter values directly map to predefined PUCCH resource configurations.
3Productivity
If the HARQ-ACK codebook size is based on configured CCs rather than scheduled CCs, then the resource allocation is simpler, but the feedback efficiency decreases
Solution Approach 1:
The patent prepares multiple PUCCH resources in advance (both first type and second type resources) with different characteristics and capacities. These pre-configured resources are ready to be selected based on the actual scheduling conditions. This preliminary preparation allows the system to efficiently handle variable codebook sizes without complex real-time allocation decisions, improving feedback efficiency while maintaining manageable complexity through pre-planned resource configurations.
Data Source
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AI summary
The disclosure provides an information transmission method and apparatus. The method includes: carrying a first parameter in physical layer signaling corresponding to a Physical Downlink Shared Channel (PDSCH); and transmitting, according to an indication of the first parameter, a Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) corresponding to the PDSCH, which may be specifically identifying an indication meaning of the current first parameter on a predetermined basis and selecting which positions are used to transmit the HARQ-ACK. By adopting the above solution, a first communication node itself sets a position at which an HARQ-ACK is transmitted, and a second communication node feeds back, according to an indication, the HARQ-ACK corresponding to a PDSCH in time, thereby solving the problem of greater delay for HARQ-ACK feedback in the related art, and ensuring the low delay processing of a service.