Wireless HARQ Feedback Segmentation for Lower Latency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As the number of component carriers (CCs) and/or hybrid automatic repeat request (HARQ) processes increases in wireless communications, the latency associated with feedback also increases, leading to decreased efficiency.
Innovation Solution
A user equipment (UE) transmits feedback data for a subset of feedback process identifiers based on a cancellation indication and control signaling from a network entity, reducing the number of feedback processes to be conveyed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback is provided for each HARQ process of each component carrier, then feedback completeness is improved, but latency increases
Solution Approach 1:
The patent segments the feedback transmission by dividing the set of feedback process identifiers into multiple subsets. Instead of transmitting all feedback identifiers in a single message, the system transmits them across multiple messages sequentially. This segmentation reduces the size of each individual feedback message, allowing for faster transmission and reduced latency while still ensuring that complete feedback is eventually delivered for all HARQ processes across all component carriers.
2Productivity
If the number of component carriers and HARQ processes increases, then system capacity is improved, but feedback overhead increases
Solution Approach 1:
The patent applies segmentation to divide the large set of feedback process identifiers into smaller subsets that are transmitted separately. This reduces the overhead of each individual feedback message, making the system more scalable as the number of component carriers and HARQ processes increases.
Solution Approach 2:
The patent implements partial action by transmitting only a subset of feedback process identifiers in each feedback message rather than all identifiers simultaneously. This partial transmission approach reduces the immediate overhead and resource consumption for each feedback round, while the system continues to provide feedback for all processes across multiple rounds, thereby managing overhead effectively as system capacity scales.
3Productivity
If all feedback process identifiers are transmitted in one message, then feedback efficiency is improved, but message size increases
Solution Approach 1:
The patent segments the feedback process identifiers into multiple subsets and transmits them in separate messages. This segmentation reduces the size of each individual message, preventing buffer overflow issues and reducing transmission time per message. The overall feedback efficiency is maintained through the sequential transmission of these smaller, manageable message segments.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. For instance, a network entity may transmit, to a user equipment Transmission (UE), control signaling indicating that the UE is to provide feedback corresponding to a set of feedback process identifiers for at least one component carrier. The network entity may transmit, to the UE, a cancellation indication Feedback Message that cancels a scheduled uplink transmission in which the UE is scheduled to provide feedback data corresponding to a subset of the set of feedback process identifiers. The network entity may transmit, to the UE, a control message scheduling the UE to transmit the feedback data corresponding to the subset of the set of feedback process identifiers (e.g., based on the cancellation indication). The UE may transmit, to the network entity, a feedback message including the feedback data for the subset based on the control message.