Multicast Feedback Resource Allocation for Wireless UEs
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Solution Overview
Problem
In wireless communication systems, the overhead of feedback transmission for multicast communications is high when multiple UEs fail to decode transport blocks, especially if each UE transmits feedback for each block, leading to inefficient resource allocation and increased overhead.
Innovation Solution
The system allows UEs to monitor transport blocks and determine the respective control channel resources for feedback transmission, enabling them to transmit feedback for subsets of transport blocks that were not decoded, reducing overhead by sharing resources and clearly indicating failed blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each UE transmits feedback for each transport block that fails to decode, then the decoding failure indication is accurate, but the feedback transmission overhead increases significantly
Solution Approach 1:
The patent segments the feedback transmission by dividing transport blocks into subsets and associating each subset with a specific control channel resource. Instead of transmitting separate feedback for each individual transport block, UEs transmit feedback at the subset level, reducing the total number of feedback transmissions while maintaining the ability to accurately indicate which blocks failed to decode through the subset-based resource association mechanism
2Loss of information
If multiple UEs transmit feedback simultaneously for the same transport blocks, then the feedback information is complete, but the resource allocation efficiency decreases
Solution Approach 1:
The patent merges feedback transmissions from multiple UEs by allowing them to share the same control channel resources when they fail to decode the same subset of transport blocks. This combining approach reduces resource allocation overhead while ensuring that the base station receives complete feedback information about decoding failures across all UEs, as the shared resource transmission inherently aggregates the feedback state
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. Generally, the described techniques provide for efficiently facilitating acknowledgment (ACK) or negative acknowledgment (NACK) feedback from a user equipment (UE) for a set of transport blocks in one or more multicast transmissions from a base station. The UE may determine control channel resources for transmitting the ACK/NACK feedback, and each respective control channel resource may correspond to a distinct subset of the set of transport blocks. Once the UE determines a subset of transport blocks that the UE failed to decode (such as at least one transport block), the UE may determine a respective control channel resource that corresponds to the at least one transport block that the UE failed to decode. The UE may transmit ACK/NACK feedback on the respective control channel resource, which, in some examples, may indicate that the UE failed to decode the subset of transport blocks.