NACK-Only HARQ-ACK Resource Selection for Multicast SPS Channels
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Solution Overview
Problem
In the context of multicast communication in NR, the insufficient PUCCH resources for NACK-only feedback mode in terminals lead to ineffective HARQ-ACK information transmission, particularly for multicast SPS PDSCHs, resulting in reduced communication effectiveness.
Innovation Solution
The terminal determines target HARQ-ACK feedback information corresponding to semi-persistent scheduling channels and selects resources from multiple configurations, including NACK-only, ACK/NACK, and unicast HARQ-ACK feedback modes, to execute the feedback procedure, thereby optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network side device configures a large number of PUCCH resources for NACK-only feedback mode, then the terminal can determine a corresponding PUCCH resource from the large number of PUCCH resources according to different HARQ-ACK information, but the device complexity increases and resource utilization becomes inefficient
Solution Approach 1:
The patent makes the PUCCH resource determination mechanism universal by allowing the terminal to select from multiple resource sets (first resource set for NACK-only feedback, second resource set for ACK/NACK feedback, third resource set for unicast feedback). This multi-functional approach enables a single resource configuration to serve multiple feedback scenarios, reducing the need for dedicated resources for each feedback type and thereby reducing overall system complexity while maintaining adaptability.
2Productivity
If the terminal feeds back HARQ-ACK information for multiple multicast PDSCHs in one PUCCH slot, then the feedback efficiency improves, but the loss of information increases when insufficient PUCCH resources are available
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple resource sets (first, second, and third resource sets) with different resource configurations before the actual feedback transmission. The terminal selects from these pre-prepared resources based on the feedback mode and available resources, ensuring that sufficient resources are always available for HARQ-ACK information transmission without causing information loss, while maintaining high feedback efficiency through multi-PDSCH aggregation capability.
3Loss of energy
If the terminal uses NACK-only feedback mode for multicast PDSCHs, then the feedback overhead is reduced, but the reliability of communication decreases when PUCCH resources are insufficient
Solution Approach 1:
The patent applies parameter changes by dynamically selecting from different resource configurations (first, second, and third resource sets) based on the feedback mode and available resources. The terminal can switch between different resource sets with different characteristics (e.g., different numbers of resources, different time frequencies) to ensure reliable transmission while maintaining the low overhead benefit of NACK-only feedback mode. This flexibility in parameter selection ensures reliability without increasing feedback overhead.
Data Source
AI summary
A hybrid automatic repeat request acknowledgement (HARQ-ACK) information feedback method, which includes a terminal determines target HARQ-ACK feedback information, where the target HARQ-ACK feedback information is feedback information corresponding to a first downlink channel, the first downlink channel is a semi-persistent scheduling downlink channel, and a feedback mode of the target HARQ-ACK feedback information is a first feedback mode. The terminal determines a target resource from resources in a target resource configuration, where the target resource configuration includes a resource configuration corresponding to the first feedback mode. The terminal executes a feedback procedure of the target HARQ-ACK feedback information on the target resource, where the first feedback mode is a NACK-only feedback mode.