Multicast HARQ Acknowledgement Using Shared PUCCH Resources
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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
A method and apparatus that allows a terminal device to transmit acknowledgement information based on a configured resource for Hybrid Automatic Repeat reQuest (HARQ) processes, using multiple Physical Uplink Control Channel (PUCCH) resources, enabling multiple terminal devices to indicate NACK signals for specific HARQ processes in the same uplink slot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple reception devices transmit acknowledgement information 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 mechanism by introducing multiple PUCCH resources that can be independently configured for different terminal devices. Each terminal device can be assigned specific PUCCH resources based on its HARQ process requirements, allowing distributed feedback transmission without overwhelming the system. This segmentation resolves the contradiction by enabling reliable acknowledgement transmission while maintaining manageable system complexity through structured resource allocation.
2Measurement precision
If multiple PUCCH resources are configured for multiple HARQ processes, then terminal devices can signal NACK for specific HARQ processes, but the resource configuration becomes more complex
Solution Approach 1:
The patent introduces an additional dimension for resource identification by configuring multiple PUCCH resources across different time-frequency slots and using distinct PUCCH format types. Terminal devices can identify and select appropriate PUCCH resources based on their specific HARQ process requirements, enabling precise signalling without requiring overly complex configuration. This dimensional approach allows the system to maintain measurement precision while managing configuration complexity through structured multi-dimensional resource allocation.
Data Source
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.