Configurable HARQ Feedback Process Types for Wireless Networks
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR and LTE, face challenges in optimizing feedback processes for hybrid automatic repeat request (HARQ) to enhance spectral efficiency and data transfer rates, especially in scenarios with high propagation delays like non-terrestrial networks.
Innovation Solution
The implementation of configurable feedback process types, such as HARQ feedback enabled, disabled, and flexible types, allows user equipment (UE) to selectively provide acknowledgments (ACK) or negative acknowledgments (NACK) based on configured feedback settings, enabling dynamic adaptation of feedback processes according to specific channel conditions and network requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is always enabled to ensure reliable data transmission, then reliability is improved, but spectral efficiency deteriorates due to excessive feedback overhead
Solution Approach 1:
The patent implements dynamic HARQ feedback adjustment by allowing the network to configure different feedback process types (first type with feedback, second type without feedback) for different downlink transmissions. This enables the system to adapt feedback behavior based on channel conditions, traffic patterns, and propagation delays, thereby optimizing the trade-off between reliability and spectral efficiency in real-time
Solution Approach 2:
The patent changes the feedback parameter by introducing configurable feedback process types that can be dynamically switched. The network can indicate to the UE whether to send HARQ feedback for each downlink transmission based on configuration parameters, effectively changing the feedback behavior parameter to optimize system performance under different conditions
2Reliability
If HARQ feedback is always transmitted to ensure data integrity, then reliability is improved, but data transfer rate deteriorates due to feedback delays
Solution Approach 1:
The patent enables dynamic control of feedback transmission timing and necessity. By configuring different feedback process types, the system can dynamically adjust whether feedback is transmitted and when it is transmitted, allowing continuous data transmission in certain scenarios while maintaining reliability where needed, thus improving overall data transfer rate
Solution Approach 2:
The patent segments the HARQ feedback process into different types (first type with feedback, second type without feedback). This segmentation allows the system to apply different feedback strategies to different data transmissions, enabling selective feedback transmission that maintains data integrity for critical transmissions while skipping feedback for less critical ones, thereby improving data transfer rate
3Adaptability or versatility
If traditional HARQ feedback processes are used in non-terrestrial networks, then protocol compatibility is maintained, but spectral efficiency deteriorates due to high propagation delays
Solution Approach 1:
The patent introduces dynamic feedback adjustment mechanisms that allow the system to adapt to high propagation delays in non-terrestrial networks. By configuring feedback process types based on round-trip time and channel conditions, the system maintains protocol compatibility while optimizing spectral efficiency for satellite and aerial network scenarios
Solution Approach 2:
The patent changes feedback parameters to suit non-terrestrial network conditions. By introducing configurable feedback process types that can be adjusted based on propagation delay characteristics, the system maintains compatibility with existing HARQ protocols while optimizing performance for high-delay environments through parameter adaptation
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for providing feedback. For example, a user equipment (UE) may receive, from a network node, a configuration of a search space comprising time and frequency resources available to the network node for communicating a downlink control channel, the configuration indicating a feedback process type corresponding to the search space. The UE may also receive, from the network node, the downlink control channel in the search space. The UE may also receive a downlink transmission scheduled by the downlink control channel. The UE may selectively provide feedback to the network node regarding decoding of the downlink transmission according to the feedback process type corresponding to the search space.