Selective HARQ Feedback Transmission in 5G NR Uplink
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently handling Hybrid Automatic Repeat Request (HARQ) feedback transmissions, which are crucial for ensuring data reliability and latency.
Innovation Solution
The proposed solution involves a method and apparatus for a User Equipment (UE) to determine whether to transmit HARQ feedback based on Downlink (DL) Control Information (DCI) received from a Base Station (BS). The UE processes the DCI to schedule DL data on a Physical Downlink Shared Channel (PDSCH) and decides on the necessity of transmitting HARQ feedback accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is transmitted for every DL data reception, then data reliability is improved, but uplink resource consumption and system latency increase
Solution Approach 1:
The patent applies partial action by implementing selective HARQ feedback transmission. Instead of transmitting feedback for every DL data reception, the UE determines whether to transmit HARQ feedback based on specific conditions evaluated from DCI parameters. This partial feedback approach maintains sufficient data reliability while reducing uplink resource consumption and system latency.
2Loss of time
If HARQ feedback transmission is optimized to reduce latency, then system efficiency is improved, but data reliability may be compromised
Solution Approach 1:
The patent implements partial feedback transmission where the UE selectively sends HARQ feedback based on evaluated conditions from DCI parameters. This approach reduces system latency by avoiding unnecessary feedback transmissions while maintaining data reliability through strategic feedback selection, thus resolving the contradiction between latency reduction and reliability maintenance.
3Measurement precision
If the UE always transmits HARQ feedback, then acknowledgment accuracy is improved, but uplink channel capacity is consumed
Solution Approach 1:
The patent applies partial action by implementing conditional HARQ feedback transmission. The UE evaluates specific conditions based on DCI parameters to determine whether feedback transmission is necessary. This selective approach maintains acknowledgment accuracy for critical transmissions while conserving uplink channel capacity by omitting redundant feedback messages.
4Productivity
If HARQ feedback transmission is reduced to conserve resources, then uplink efficiency is improved, but feedback completeness decreases
Solution Approach 1:
The patent implements partial feedback transmission where the UE selectively sends HARQ feedback based on evaluated conditions from DCI parameters. This approach improves uplink efficiency by reducing unnecessary feedback transmissions while maintaining feedback completeness for critical data receptions, thus resolving the contradiction between efficiency improvement and information loss.
Data Source
AI summary
A method for handling Hybrid Automatic Repeat reQuest (HARQ) feedback transmissions includes a User Equipment (UE) receiving, from a Base Station (BS), Downlink Control Information (DCI) on a Physical Downlink Control Channel (PDCCH). The DCI schedules a reception of Downlink (DL) data on a Physical Downlink Shared Channel (PDSCH). The method further includes the UE determining whether to transmit a HARQ feedback for the DL data according to the DCI.