PUCCH Resource Configuration for Multicast HARQ-ACK Feedback
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing hybrid automatic repeat request (HARQ) acknowledgement (ACK) feedback for multicast transmissions, particularly in configuring physical uplink control channel (PUCCH) resources, which leads to scarcity and inefficiency, especially when a large number of UEs are involved, impacting quality of service (QoS) and resource allocation.
Innovation Solution
The proposed solution dynamically adjusts HARQ-ACK feedback options based on Quality of Service (QoS) requirements, the number of UEs in a multicast group, and available PUCCH resources by configuring a common PUCCH resource pool and using HARQ-ACK feedback modes such as group NACK-only, UE-specific NACK-only, and UE-specific ACK/NACK feedback, allowing for flexible resource allocation and efficient feedback transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a common PUCCH resource pool is configured for all UEs in a multicast group, then resource allocation flexibility is improved, but resource exhaustion occurs when a large number of UEs are involved
Solution Approach 1:
The patent segments the multicast group into multiple sub-groups, with each sub-group having its own dedicated PUCCH resource pool. This segmentation prevents resource exhaustion in large groups while maintaining allocation flexibility within each smaller sub-group, directly resolving the contradiction between flexibility and resource availability.
Solution Approach 2:
The patent introduces a new dimension of organization by creating hierarchical group structures (parent groups and child sub-groups) with multiple levels of PUCCH resource pools. This dimensional change allows the system to scale to large numbers of UEs without exhausting resources, while preserving flexibility through the hierarchical structure.
2Adaptability or versatility
If multiple HARQ-ACK feedback modes are supported, then QoS requirements can be dynamically adjusted, but system complexity increases
Solution Approach 1:
The patent implements dynamic selection among multiple HARQ-ACK feedback modes (ACK-only, NACK-only, ACK/NACK) based on real-time QoS requirements and group characteristics. The system can dynamically switch between modes and configurations to adapt to changing conditions, resolving the contradiction between adaptability and complexity through controlled dynamics.
Solution Approach 2:
The patent changes key parameters such as feedback mode, group size, and PUCCH resource allocation based on QoS requirements. By systematically varying these parameters, the system achieves dynamic QoS adjustment while managing complexity through parameter-based control rather than structural complexity.
3Measurement precision
If UE-specific PUCCH resources are allocated to each UE, then feedback precision is improved, but resource overhead increases significantly
Solution Approach 1:
The patent segments UEs into sub-groups and allocates PUCCH resources at the sub-group level rather than individual UE level. This segmentation provides sufficient feedback precision for multicast operations while significantly reducing resource overhead compared to full UE-specific allocation, directly resolving the contradiction.
Solution Approach 2:
The patent implements partial UE-specific resource allocation where only certain UEs or certain types of feedback require dedicated resources, while others share resources. This partial action approach provides necessary precision where needed while avoiding excessive resource consumption, resolving the contradiction between precision and overhead.
Data Source
AI summary
Embodiments of the present disclosure relate to physical uplink control channel (PUCCH) resource configuration. According to some embodiments of the disclosure, a method performed by a user equipment (UE) may include: receiving configuration information of a PUCCH resource pool for a group of UEs receiving a multicast transmission, wherein the group of UEs comprises the UE; and receiving a hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback mode indication, wherein the HARQ-ACK feedback mode indication indicates a HARQ-ACK feedback mode for the multicast transmission from a plurality of HARQ-ACK feedback modes; and determining, based on the indicated HARQ-ACK feedback mode, a PUCCH resource from the PUCCH resource pool for transmitting HARQ-ACK feedback for the multicast transmission.