UE HARQ Feedback Rules for SPS Activation in 5G NR
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in optimizing hybrid automatic repeat request (HARQ) feedback operations to accommodate varying use cases and network dynamics, such as enhanced Mobile Broadband (eMBB), massive Machine-Type Communication (mMTC), and Ultra-Reliable and Low-Latency Communication (URLLC), especially in non-terrestrial networks (NTN) with long propagation delays.
Innovation Solution
A method and user equipment (UE) for performing HARQ feedback operations that enable or disable HARQ feedback based on configurations received from the base station (BS), allowing the UE to determine and transmit HARQ feedback according to activation or deactivation of semi-persistent scheduling (SPS) indicated by Downlink Control Information (DCI), independent of HARQ feedback enablement, and utilizing RRC signaling for configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ feedback is disabled for a HARQ process to reduce overhead and improve efficiency, then system efficiency is improved, but the ability to handle activation/deactivation of semi-persistent scheduling (SPS) reliably deteriorates
Solution Approach 1:
The patent applies local quality by making HARQ feedback behavior configuration-specific rather than uniform across all scenarios. The UE determines whether to transmit HARQ feedback based on the specific configuration received from the BS, allowing different feedback behaviors for different configurations while maintaining overall system efficiency.
Solution Approach 2:
The patent implements dynamics by allowing the HARQ feedback transmission behavior to change based on the received configuration. The UE can dynamically adjust its feedback transmission decisions according to the configuration, enabling flexible adaptation between transmitting feedback for SPS activation/deactivation or suppressing feedback to improve efficiency.
2Reliability
If HARQ feedback is transmitted for all PDSCH receptions to ensure reliable communication, then communication reliability is improved, but transmission overhead and latency increase
Solution Approach 1:
The patent applies parameter changes by modifying the HARQ feedback transmission parameter based on the received configuration. The configuration indicates whether the UE should transmit HARQ feedback for SPS activation/deactivation, allowing the system to optimize feedback transmission parameters according to specific operational requirements and network conditions.
3Reliability
If the UE transmits HARQ feedback for SPS activation regardless of HARQ feedback enablement status, then SPS activation reliability is improved, but uplink overhead increases
Solution Approach 1:
The patent applies local quality by making HARQ feedback behavior configuration-specific rather than uniform across all scenarios. The UE determines whether to transmit HARQ feedback based on the specific configuration received from the BS, allowing different feedback behaviors for different configurations while maintaining overall system efficiency.
Data Source
AI summary
A method and a user equipment for performing a Hybrid Automatic Repeat Request (HARQ) feedback operation are provided. The method includes: receiving, from a Base Station (BS), a first configuration indicating whether HARQ feedback for a HARQ process is enabled or disabled; receiving, from the BS, Downlink Control Information (DCI) on a Physical Downlink Control Channel (PDCCH), the DCI indicating (i) activation or deactivation of semi-persistent scheduling (SPS) and (ii) a Physical Downlink Shared Channel (PDSCH) reception for the HARQ process; and determining, based on a second configuration, and regardless of the HARQ feedback for the HARQ process is enabled or disabled, whether to transmit the HARQ feedback to the BS in response to the PDSCH reception in a case that the second configuration is received from the BS and the DCI indicates the activation of the SPS.