HARQ-ACK Feedback Scheduling for Multicast PUCCH Congestion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for multicast transmissions, particularly in scenarios with a large number of user equipment (UEs), leading to PUCCH resource exhaustion and interference issues.
Innovation Solution
The proposed solution involves dividing UEs into sub-groups based on geographic location, UE capability, or transmit beam, and configuring specific PUCCH resources and timing for each sub-group to transmit HARQ-ACK feedback, allowing for efficient use of PUCCH resources by transmitting feedback in different slots or sub-slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all UEs transmit HARQ-ACK feedback simultaneously on the same PUCCH resources, then the feedback is received in a timely manner, but PUCCH resource exhaustion and interference occur
Solution Approach 1:
The patent divides the MBS group into multiple sub-groups and assigns different PUCCH resources and time slots to each sub-group for HARQ-ACK feedback transmission. This segmentation prevents all UEs from using the same resources simultaneously, thereby reducing resource exhaustion and interference while maintaining reliable feedback reception.
2Adaptability or versatility
If PUCCH resources are allocated for all UEs to transmit HARQ-ACK feedback, then feedback capability is ensured, but resource overhead increases
Solution Approach 1:
By segmenting UEs into sub-groups and allowing only certain sub-groups to transmit HARQ-ACK feedback in specific time slots, the patent reduces the number of UEs using PUCCH resources simultaneously. This maintains feedback capability for all UEs while reducing overall PUCCH resource overhead through time-division multiplexing.
3Productivity
If multiple UEs share the same PUCCH resources, then resource efficiency is improved, but interference increases
Solution Approach 1:
The patent implements periodic action by configuring different time slots for different sub-groups to transmit HARQ-ACK feedback. This time-division approach allows multiple UEs to share PUCCH resources periodically without simultaneous transmission, thereby maintaining resource efficiency while minimizing interference between different UE groups.
Data Source
AI summary
Embodiments of the present disclosure relate to hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback transmission. According to some embodiments of the disclosure, a method may include: receiving, from a base station (BS), configuration information for a sub-group of UEs, wherein the sub-group of UEs comprises the UE; receiving, from the BS, a downlink control information (DCI) format for scheduling a physical downlink shared channel (PDSCH), wherein the PDSCH is received by a plurality of UEs which are divided into a plurality of sub-groups of UEs comprising the sub-group of UEs; determining a time domain resource for transmitting HARQ-ACK feedback for the PDSCH; and transmitting, to the BS, the HARQ-ACK feedback for the PDSCH on the time domain resource.