HARQ Feedback Configuration for NTN Delay and Process Stalling
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing Hybrid Automatic Repeat Request (HARQ) feedback processes, particularly in non-terrestrial networks (NTN) where significant propagation delays can lead to HARQ process stalling.
Innovation Solution
The implementation of techniques to disable HARQ feedback at the physical layer, allowing for the configuration of HARQ processes based on whether feedback is enabled or disabled, using HARQ process identifiers to manage downlink and uplink communications effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is enabled for downlink communications in NTN, then communication reliability is improved, but HARQ process stalling occurs due to significant propagation delays
Solution Approach 1:
The patent applies dynamics by making the HARQ feedback mechanism adaptable rather than static. The base station dynamically determines whether to enable or disable HARQ feedback based on the specific communication scenario, propagation delay characteristics, and service requirements. This allows the system to switch between feedback-enabled mode (for reliability-critical scenarios) and feedback-disabled mode (for delay-sensitive scenarios), resolving the contradiction between reliability and time loss.
Solution Approach 2:
The patent changes the parameter of HARQ feedback configuration from a fixed state to a variable state. By introducing configuration information that indicates whether HARQ feedback is enabled or disabled for specific HARQ processes, the system can adjust this parameter based on propagation delay conditions, service types, and network requirements. This parameter change allows the system to optimize between reliability and timing performance.
2Loss of time
If HARQ feedback is disabled to prevent stalling, then propagation delay issues are mitigated, but communication reliability deteriorates
Solution Approach 1:
The patent applies local quality by enabling different HARQ feedback configurations for different HARQ processes or different communication scenarios. Instead of uniformly disabling HARQ feedback across all processes, the base station can selectively enable or disable feedback for specific HARQ processes based on their individual requirements, propagation delay characteristics, and service priorities. This localized approach allows some processes to maintain high reliability through feedback while others avoid stalling by disabling feedback.
Solution Approach 2:
The system dynamically adjusts HARQ feedback configuration based on real-time conditions. The base station evaluates propagation delay, service requirements, and HARQ process status to dynamically determine the appropriate feedback configuration, allowing the system to adapt to changing conditions and optimize both timing and reliability performance.
3Adaptability or versatility
If HARQ feedback configuration is added to manage stalling, then system adaptability is improved, but device complexity increases
Solution Approach 1:
The patent introduces a feedback mechanism where the base station sends configuration information to the UE indicating whether HARQ feedback is enabled or disabled for specific HARQ processes. The UE then follows this configuration when providing HARQ feedback. This feedback loop from the base station to the UE enables the system to adapt to different propagation delay conditions and service requirements without requiring complex autonomous decision-making at the UE side, thus managing complexity while improving adaptability.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive information indicating whether hybrid automatic repeat request (HARQ) feedback is disabled for one or more HARQ processes. The UE may receive a downlink communication. The downlink communication may include a HARQ process identifier that indicates a HARQ process to be used for the downlink communication. The UE may selectively provide HARQ feedback for the downlink communication based at least in part on the HARQ identifier and information indicating whether HARQ feedback is disabled for the HARQ process. Numerous other aspects are provided.