Dynamic ACK-NACK Feedback Selection for SPS Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in feedback configurations for semi-persistent scheduling (SPS) resource allocations, particularly in selecting between ACK-only and NACK-only feedback configurations, which do not adequately adapt to changing error rates and traffic conditions, leading to suboptimal resource utilization and increased overhead.
Innovation Solution
A method and apparatus for dynamically selecting between ACK-only and NACK-only feedback configurations based on error rates and traffic conditions associated with SPS resource allocations, allowing for adaptive feedback configurations that optimize communication resource utilization by reducing unnecessary feedback transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If ACK-only feedback configuration is used, then feedback transmission is simplified, but resource utilization efficiency deteriorates due to unnecessary ACK transmissions in high error rate conditions
Solution Approach 1:
The patent implements dynamic feedback configuration selection that adapts between ACK-only and NACK-only modes based on real-time error rate conditions. The system transitions from static to dynamic configuration, selecting the optimal feedback mode (ACK-only or NACK-only) according to current channel conditions, thereby resolving the contradiction between simplification and efficiency.
Solution Approach 2:
The system changes the feedback configuration parameter (ACK-only vs. NACK-only) based on error rate thresholds. When error rate exceeds a threshold, the system switches to NACK-only mode to avoid unnecessary retransmissions; when error rate is low, it uses ACK-only mode for simplicity. This parameter adaptation resolves the contradiction by optimizing for different operating conditions.
2Productivity
If NACK-only feedback configuration is used, then resource utilization efficiency is improved by avoiding unnecessary ACK transmissions, but feedback configuration complexity increases due to error rate monitoring and dynamic selection
Solution Approach 1:
The patent implements a feedback mechanism where the system monitors error rates and uses this information to dynamically select the appropriate feedback configuration. The error rate monitoring and conditional selection logic provide the intelligence needed to achieve high resource utilization without requiring complex manual configuration, as the system self-adjusts based on observed conditions.
Solution Approach 2:
The system performs self-optimization by automatically monitoring its own error rate performance and selecting the appropriate feedback mode without external intervention. This self-service capability allows the system to maintain high resource utilization efficiency while managing configuration complexity through autonomous adaptation rather than external control.
3Device complexity
If static feedback configuration is used, then device complexity is reduced, but adaptability to changing error rates and traffic conditions deteriorates
Solution Approach 1:
The patent transforms the static feedback configuration into a dynamic system that automatically adapts to changing error rates and traffic conditions. The system continuously monitors channel conditions and switches between ACK-only and NACK-only modes as needed, providing adaptability while keeping implementation complexity manageable through well-defined switching criteria based on error rate thresholds.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may select, from at least an acknowledgment (ACK)-only feedback configuration and a negative ACK (NACK)-only feedback configuration and based at least in part on an error rate and a traffic condition associated with a semi-persistent scheduling (SPS) resource allocation, a feedback configuration for the SPS resource allocation. The UE may transmit feedback regarding the SPS resource allocation using the selected feedback configuration. Numerous other aspects are provided.