Feedback Window Segmentation for Early Multi-TTI Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional feedback techniques in wireless communications systems are deficient in providing early feedback for transmissions in multi-TTI grants and slot aggregation, leading to inefficient use of resources and increased retransmission latency.
Innovation Solution
Implementing a feedback window that allows for early feedback within a set of consecutive transmission time intervals, enabling the reallocation of resources and reducing retransmission latency by permitting earlier retransmissions when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional feedback techniques are used in multi-TTI grants and slot aggregation, then feedback is provided only after the last TTI, but this leads to increased retransmission latency and inefficient resource utilization
Solution Approach 1:
The feedback mechanism is segmented into multiple feedback windows distributed across different TTIs within the multi-TTI grant. Instead of a single feedback window after the last TTI, feedback windows are created at intermediate points, allowing earlier feedback transmission and reducing retransmission latency without fundamentally changing the overall feedback mechanism structure
Solution Approach 2:
Feedback windows are established in advance within the multi-TTI grant structure, allowing the receiver to transmit feedback earlier than conventional techniques. This preliminary action enables the transmitter to receive acknowledgment or negative acknowledgment before the multi-TTI grant period ends, reducing waiting time and enabling faster retransmission scheduling
2Productivity
If feedback is provided only after the last TTI of a set of consecutive TTIs, then the feedback mechanism is simple, but resource allocation efficiency decreases and retransmission latency increases
Solution Approach 1:
The feedback mechanism transitions from a static, single-point feedback window to a dynamic structure with multiple feedback windows at different time points within the multi-TTI grant. This allows the system to adapt feedback timing based on transmission needs, enabling earlier feedback when beneficial while maintaining the original simple structure when not needed
Solution Approach 2:
Multiple feedback windows are introduced within the multi-TTI grant, creating intermediate feedback opportunities. This allows the receiver to send feedback earlier in the transmission process, enabling the transmitter to make scheduling decisions sooner and improving overall resource allocation efficiency without requiring a complete redesign of the feedback mechanism
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive an indicator of a feedback window that is offset relative to a beginning transmission time interval (TTI) of a set of consecutive TTIs. The consecutive TTIs may include a set of aggregated slots or may correspond to a multi-TTI grant. The feedback window may include multiple control channel occasions interspersed within a duration of the set of consecutive TTIs. The UE may receive a transport block within a first TTI of the set of consecutive TTIs and transmit, within a control channel, feedback to indicate whether the transport block was successfully received.