Uplink Shared Channel Feedback Multiplexing
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Solution Overview
Problem
Wireless communication systems face inefficiencies in feedback transmission due to conflicts between symbol periods allocated for feedback and downlink reception, particularly when transmission time interval formats change, leading to resource overload and interference in uplink control channels.
Innovation Solution
User equipment (UE) defers feedback transmission until an uplink shared channel resource becomes available, multiplexing feedback with uplink data to avoid conflicts and optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If feedback is transmitted in the first available control channel when transmission time interval format changes, then feedback transmission speed is improved, but resource overload and interference in uplink control channels occurs
Solution Approach 1:
The patent introduces an intermediary mechanism (uplink shared channel) to transfer feedback information when control channels are overloaded. Instead of forcing all feedback through the congested control channel, the system uses the uplink shared channel as an alternative pathway, mediated by multiplexing feedback with data transmissions.
Solution Approach 2:
The patent implements dynamic feedback transmission by allowing the feedback path to switch between control channel and uplink shared channel based on current system conditions. When format changes occur or control channel resources are insufficient, the system dynamically redirects feedback to the uplink shared channel.
2Object-affected harmful factors
If feedback transmission is deferred to uplink shared channel resources, then resource overload and interference are reduced, but feedback transmission latency increases
Solution Approach 1:
The patent merges feedback transmission with uplink data transmissions by multiplexing feedback bits with data on the uplink shared channel. This combining approach allows feedback to be transmitted alongside data rather than requiring separate dedicated resources, thereby reducing latency while avoiding control channel overload.
Solution Approach 2:
The patent ensures continuous feedback transmission by utilizing ongoing uplink data transmissions as carrier waves for feedback information. Rather than creating separate feedback transmission opportunities, the system continuously multiplexes feedback with scheduled uplink data, maintaining uninterrupted feedback flow.
3Loss of substance
If feedback is multiplexed with uplink data in shared channel resources, then signaling overhead is reduced, but complexity of feedback transmission management increases
Solution Approach 1:
The patent makes the uplink shared channel universal by enabling it to carry both data and feedback information simultaneously. This multi-functionality eliminates the need for separate dedicated feedback channels in certain scenarios, reducing overall signaling overhead while consolidating transmission resources.
Solution Approach 2:
The patent changes the parameter of feedback transmission from dedicated control channel resources to shared data channel resources with multiplexing. This parameter change transforms the feedback mechanism from a separate control function to an integrated data transmission function, reducing overhead but requiring enhanced management capabilities.
Data Source
AI summary
Methods, systems, and devices for wireless communication at a user equipment (UE) are described. A UE may receive control signaling configuring periodic resources for receiving semi-persistent scheduled downlink transmissions and may receive a control message indicating a change to a transmission time interval format. The UE may identify a conflict for a symbol period between uplink transmission of feedback for a first semi-persistent scheduled downlink transmission and downlink reception based on the change to the transmission time interval format. The UE may then transmit, in an uplink shared channel resource of the transmission time interval format that differs from the symbol period, an uplink message including uplink data multiplexed with the feedback based on the conflict.