PUCCH Resource Segmentation for Multicast Feedback Multiplexing
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently multiplexing resources for feedback messages, particularly in scenarios where multiple NACK-only PUCCH transmissions occur in the same slot, leading to resource wastage and inability to determine which UE transmitted a NACK-only PUCCH, especially in multicast communications.
Innovation Solution
The technology configures a set of specific PUCCH resources for each NACK-only feedback state, allowing UEs to transmit PUCCH based on their feedback state, and the network detects these resources to obtain all possible feedback states, or transforms NACK-only feedback into ACK/NACK bits for transmission in UE-specific PUCCH resources, enabling efficient multiplexing and resource recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple NACK-only PUCCH transmissions are allowed in the same slot for multicast services, then feedback coverage is improved, but resource wastage increases and the network cannot determine which UE transmitted the feedback
Solution Approach 1:
The PUCCH resource set is segmented into multiple specific PUCCH resources, where each resource corresponds to a particular feedback state (e.g., NACK, ACK, DTX). This segmentation allows the network to identify which UE transmitted feedback and in what state, resolving the ambiguity while maintaining support for multiple simultaneous transmissions.
Solution Approach 2:
Different PUCCH resources are assigned based on the local feedback state of each UE. By configuring specific resources for different feedback states, the system ensures that each transmission has a unique identifier, enabling the network to distinguish between multiple UEs transmitting in the same slot without causing resource wastage.
2Productivity
If specific PUCCH resources are configured for each feedback state, then resource multiplexing efficiency is improved, but device complexity increases due to additional configuration and detection requirements
Solution Approach 1:
The PUCCH resources are pre-configured by the network before feedback transmission occurs. The gNB configures the UE with a set of specific PUCCH resources corresponding to different feedback states in advance, eliminating the need for complex real-time resource allocation and reducing detection complexity during actual feedback transmission.
Solution Approach 2:
The UE autonomously selects and transmits on the appropriate PUCCH resource based on its own feedback state without requiring complex scheduling interactions with the network. This self-service approach simplifies the overall system complexity while maintaining efficient resource multiplexing.
Data Source
AI summary
Methods and systems for techniques for multiplexing resources for feedback messages in wireless networks are disclosed. In an implementation, a method of wireless communication includes: configuring, by a network node, a set of channel resources to indicate a plurality of feedback states for different multicast services, wherein each channel resource corresponds to one of the feedback states, wherein each of the feedback states includes a combination of values such that each value indicates whether: a downlink message has been decoded correctly; or the downlink message has not been received or has been decoded incorrectly; and receiving, by the network node, from a wireless device, uplink messages on one of the channel resources corresponding to a feedback state of the wireless device.