Configurable HARQ Feedback for 5G Sidelink Latency
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Solution Overview
Problem
Current 5G wireless systems face challenges in efficiently managing hybrid automatic repeat requests (HARQ) feedback for new radio sidelink communication, leading to suboptimal data packet latency and resource allocation in scenarios where immediate retransmissions are necessary.
Innovation Solution
The implementation of a configurable HARQ feedback system that allows HARQ feedback to be sent directly to the transmitter or scheduler, enabling autonomous retransmissions and precise resource allocation based on available resources and traffic quality of service (QoS), thereby trading off between data packet latency and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If HARQ feedback is sent directly to the transmitter for immediate retransmissions, then data packet latency is reduced, but resource allocation precision deteriorates
Solution Approach 1:
The system dynamically configures HARQ feedback types (Type 1 for direct transmitter feedback, Type 2 for scheduler feedback) based on real-time channel conditions and traffic QoS requirements. This dynamic switching allows the system to optimize between latency and resource allocation precision depending on the current operational context.
Solution Approach 2:
The patent changes the feedback mechanism parameter by introducing configurable HARQ feedback types that can be selected based on system conditions. This parameter change enables the system to trade off between immediate retransmission capability and precise resource allocation by choosing the appropriate feedback type for each scenario.
2Productivity
If HARQ feedback is sent to the scheduler for precise resource allocation, then resource usage is optimized, but data packet latency increases
Solution Approach 1:
The system dynamically selects between feedback types based on channel conditions and QoS requirements. When low latency is critical, Type 1 feedback is used; when resource optimization is prioritized, Type 2 feedback is used. This dynamic adaptation resolves the contradiction by choosing the appropriate path based on current system state.
Solution Approach 2:
The patent introduces a configurable feedback type parameter that allows the system to change its operational mode between latency-optimized and resource-optimized paths. This parameter change enables flexible trade-off management based on real-time network conditions and service requirements.
3Device complexity
If fixed HARQ feedback mechanism is used, then system complexity is reduced, but adaptability to different traffic QoS deteriorates
Solution Approach 1:
The system introduces dynamic configurability to the HARQ feedback mechanism, allowing it to adapt to different traffic QoS requirements. The configurable feedback type parameter enables the system to adjust its behavior based on channel conditions and service needs, significantly improving adaptability while maintaining manageable complexity through structured configuration options.
Data Source
AI summary
Facilitating configurable hybrid automatic repeat request (HARQ) feedback types for new radio sidelink communication can be performed for a 5G wireless network. Based on whether reception of data was successful or not, a reception node can send acknowledgement (ACK) data or negative acknowledgement (NACK) data to a base station using an uplink control signal. Therefore, the feedback data can be used to manage subsequent resource allocation decisions within the 5G wireless network.