Multicast HARQ-ACK PUCCH Configuration for NR Downlink Reception
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Solution Overview
Problem
In future radio communication systems like NR, the reception of multicast downlink data by multiple user terminals in ultra-dense and high traffic environments is not adequately addressed, leading to potential throughput reduction and inefficiencies.
Innovation Solution
A terminal is equipped with a receiving section for configuring and controlling the transmission of Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) information using a physical uplink control channel (PUCCH) resource, specifically for multicast physical downlink shared channels (PDSCH), enabling appropriate HARQ-ACK feedback mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UEs perform reception of downlink data using multicast in ultra-dense and high traffic environment, then system capacity is improved, but throughput reduction occurs due to lack of appropriate HARQ-ACK feedback mechanism
Solution Approach 1:
The patent segments the HARQ-ACK feedback mechanism by introducing a dedicated PUCCH resource for multicast HARQ-ACK feedback, separate from unicast feedback resources. This segmentation allows multiple UEs to provide feedback for multicast data without interfering with unicast communications, thereby maintaining throughput in high-capacity environments.
Solution Approach 2:
The patent introduces a PUCCH resource as an intermediary channel specifically for transmitting HARQ-ACK feedback related to multicast PDSCH. This intermediary resource enables reliable feedback transmission from multiple UEs to the base station, ensuring that throughput is maintained despite the presence of multiple UEs in the network.
2Reliability
If HARQ-ACK feedback mechanism is added for multicast PDSCH, then reception reliability is improved, but device complexity increases
Solution Approach 1:
The patent makes the PUCCH resource universal by configuring it to serve multiple purposes: it can be used for HARQ-ACK feedback for both multicast and unicast PDSCH depending on the scheduling DCI type. This multi-functionality reduces terminal complexity by avoiding the need for completely separate feedback channels, while still providing reliable reception feedback for multicast.
3Reliability
If dedicated PUCCH resource for multicast HARQ-ACK feedback is configured, then feedback reliability is improved, but power consumption increases
Solution Approach 1:
The patent introduces dynamic configuration where the PUCCH resource for multicast HARQ-ACK feedback can be activated or deactivated based on actual usage conditions. The base station can dynamically indicate whether a UE should use the dedicated multicast PUCCH resource or the shared unicast PUCCH resource, allowing the system to adapt power consumption based on traffic conditions and feedback requirements.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes: a receiving section that receives a configuration of a physical uplink control channel (PUCCH) resource for transmission of hybrid automatic repeat reQuest acknowledgement (HARQ-ACK) information for a multicast physical downlink shared channel (PDSCH); and a control section that controls transmission of the HARQ-ACK information using the PUCCH resource. According to one aspect of the present disclosure, it is possible to appropriately receive multicast downlink data.