Multicast HARQ Acknowledgement Using Phase-Rotated PUCCH Resources
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multicast communication, it is challenging for multiple reception devices to transmit acknowledgement information to the transmission device, making it difficult for the transmission device to determine which data needs to be retransmitted.
Innovation Solution
The proposed solution enables group-UEs to indicate NACK signals for multiple HARQ processes in the same uplink slot by using multiple PUCCH resources and phase rotations, allowing the transmission device to identify which data needs retransmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all reception devices transmit acknowledgement information to the transmission device in multicast communication, then the transmission device can understand whether data is received and decoded, but it becomes very hard for all reception devices to transmit the information about acknowledgement
Solution Approach 1:
The patent segments the acknowledgement feedback by introducing a representative reception device that collects NACK signals from multiple reception devices and transmits them centrally. This divides the complex multi-device feedback problem into a manageable single-point feedback mechanism, reducing overall system complexity while maintaining reliability.
Solution Approach 2:
The representative reception device acts as an intermediary between multiple reception devices and the transmission device. It collects acknowledgement information from group UEs and forwards consolidated feedback to the transmission device, simplifying the communication architecture and reducing the burden on all devices to transmit simultaneously.
2Measurement precision
If multiple NACK signals are transmitted in the same uplink slot using multiple PUCCH resources, then the transmission device can accurately determine which data needs retransmission, but the complexity of resource configuration increases
Solution Approach 1:
The patent utilizes phase rotation as an additional dimension to encode HARQ process information. Instead of only using different time-frequency resources, the system embeds process identification in the phase domain, allowing multiple NACK signals to be distinguished through phase differences while sharing the same uplink slot resources.
Solution Approach 2:
The PUCCH resource is designed to serve multiple functions simultaneously: it carries NACK signals for multiple HARQ processes and encodes process identification through phase rotation. This multi-functional design reduces the need for separate dedicated resources for each HARQ process, simplifying overall resource configuration.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Various embodiments of the present disclosure provide method and apparatus for acknowledgement in multicast. A method performed by a terminal device, comprising: transmitting, to a network node, information about acknowledgement, based on a configuration of a resource for the information about acknowledgement. The resource is configured for a plurality of terminal devices including the terminal device, and for at least one Hybrid Automatic Repeat reQuest, HARQ, process. According to embodiments for the present disclosure, manner for acknowledgement in multicast is provided.