Synchronous Unicast Multicast HARQ-ACK Feedback Resource Mapping
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Solution Overview
Problem
In SC-PTM transmission, there is no defined mechanism for user equipment (UE) to feedback multiple pieces of HARQ-ACK information, including multicast HARQ-ACK, leading to resource wastage and inefficiencies in eMBMS transmission, as UE cannot distinguish between acknowledgement information from different receiving devices in multicast PUCCH resources.
Innovation Solution
A method where the receiving device determines a feedback resource based on the data receiving status of both unicast and multicast data, using a resource mapping relationship to indicate the mapping between data receiving status and feedback resource, allowing synchronous feedback of receiving status to the sending device, and utilizing different multicast PUCCH resources for each UE to avoid resource conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE feeds back multiple pieces of HARQ-ACK information in SC-PTM transmission, then the receiving status of unicast and multicast data can be synchronously fed back, but the base station cannot distinguish between acknowledgement information from different UEs in multicast PUCCH resources
Solution Approach 1:
The patent segments the feedback resource space by assigning different PUCCH resources to different UEs based on their UE IDs. This segmentation allows the base station to distinguish which UE sent which HARQ-ACK feedback, resolving the collision problem while maintaining efficient synchronous feedback for both unicast and multicast data
Solution Approach 2:
The patent applies local quality by making each UE's feedback resource specific and unique to that UE. The PUCCH resource assignment is locally optimized for each UE based on its ID, ensuring that while all UEs can feedback efficiently, each feedback is locally distinguishable at the base station
2Ease of manufacture
If eMBMS transmission uses fixed subframe configuration in MBSFN region, then transmission simplicity is maintained, but resource allocation flexibility is reduced causing resource waste
Solution Approach 1:
The patent introduces dynamic resource allocation for SC-PTM transmission within the MBSFN framework. While eMBMS maintains its fixed subframe configuration for simplicity, SC-PTM can dynamically allocate resources in flexible subframes, allowing the system to adapt to varying traffic demands without compromising the simplicity of eMBMS operation
3Productivity
If unicast and multicast transmissions share the same PDSCH resource in the same subframe, then spectral efficiency is improved, but feedback resource conflict occurs
Solution Approach 1:
The patent resolves the feedback resource conflict by introducing a new dimension for resource differentiation - using UE-specific PUCCH resources instead of time-frequency resource separation. This allows unicast and multicast transmissions to share PDSCH resources in the same subframe while their feedback paths are distinguished through the PUCCH resource dimension, maintaining spectral efficiency without feedback conflicts
Data Source
AI summary
The present disclosure provides example acknowledgement information sending and receiving methods, as well as example sending and receiving devices, so that the receiving device synchronously feeds back a receiving status of unicast data and a receiving status of multicast data to the sending device. One example method includes receiving unicast data and multicast data sent by a sending device in a same subframe. A feedback resource is determined according to a data receiving status and a resource mapping relationship, where the data receiving status includes a receiving status of the unicast data and a receiving status of the multicast data, and where the resource mapping relationship indicates a mapping relationship between the data receiving status and the feedback resource. Acknowledgement information is then sent to the sending device by using the determined feedback resource to notify the sending device of the receiving status of the unicast data and the receiving status of the multicast data.