Selective HARQ Retransmission Based on SINR for Lower Uplink Overhead
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Solution Overview
Problem
Existing wireless communication systems face excessive uplink overhead due to frequent channel status information reporting and hybrid automatic repeat request (HARQ) mechanisms, which compromise quality of service (QoS) and increase transmission inefficiency.
Innovation Solution
Implement a dynamic retransmission mechanism that disables HARQ when signal-to-noise and interference ratio (SINR) meets a predetermined threshold, switching to slower radio link control (RLC) or packet data convergence protocol (PDCP) retransmissions for wireless devices closer to the access node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ retransmission mechanism is enabled for all wireless devices, then transmission reliability is improved, but uplink overhead increases excessively
Solution Approach 1:
The patent applies local quality by differentiating retransmission mechanisms based on wireless device location and channel conditions. Devices closer to the access node with better SINR use slower RLC/PDCP retransmissions, while devices farther away or with poor SINR use faster HARQ retransmissions. This localized adaptation resolves the contradiction by optimizing each device's retransmission strategy according to its specific conditions rather than applying a uniform approach.
Solution Approach 2:
The patent implements dynamics by making the retransmission mechanism selection adaptive and changeable based on real-time SINR measurements and channel conditions. The system dynamically switches between HARQ and RLC/PDCP retransmission methods according to current network conditions, allowing optimization of both reliability and overhead as conditions change over time.
2Reliability
If frequent CSI reporting is implemented, then QoS is improved, but overhead on wireless communication links increases
Solution Approach 1:
The patent applies parameter changes by adjusting the CSI reporting frequency and retransmission mechanism selection based on SINR thresholds and channel conditions. When SINR is above the threshold, the system reduces CSI reporting frequency and uses slower retransmission methods, thereby reducing overhead while maintaining adequate QoS. This dynamic parameter adjustment resolves the contradiction between QoS and overhead.
3Measurement precision
If HARQ mechanism is used, then transmission accuracy is improved, but transmission efficiency decreases due to increased overhead
Solution Approach 1:
The patent applies local quality by matching the retransmission mechanism to the local channel conditions of each wireless device. Devices with good channel conditions (high SINR) use RLC/PDCP retransmissions which have lower overhead and higher efficiency, while devices with poor channel conditions use HARQ which provides higher transmission accuracy. This resolves the contradiction by optimizing the trade-off between accuracy and efficiency based on local conditions.
Solution Approach 2:
The patent implements dynamics by enabling flexible switching between HARQ and RLC/PDCP retransmission mechanisms based on real-time SINR measurements. The system dynamically selects the most appropriate mechanism to maintain transmission accuracy while maximizing efficiency under current channel conditions, resolving the static trade-off between accuracy and efficiency.
Data Source
AI summary
Systems and methods are provided for an improved link budged resulting from reduced overhead. The method includes determining a signal to noise and interference ratio (SINR) at a wireless device, comparing the SINR to a predetermined threshold and determining the SINR at the wireless device meets the predetermined threshold. The method additionally includes disabling a hybrid automatic repeat request (HARQ) retransmission mechanism for the wireless device based on the determination that the SINR at the wireless devices meets the predetermined threshold.