Dynamic Retransmission Rate Selection for Fast Moving Wireless Devices
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Solution Overview
Problem
In wireless communication networks, especially in WLANs, fast-moving devices experience signal degradation due to changing channel conditions, leading to increased latency, packet loss, and reduced throughput, as existing rate adaptation mechanisms are not effective in scenarios where devices are in motion.
Innovation Solution
A method for selecting retransmission rates in wireless communication systems that takes into account the relative velocity and past signal strength fluctuations between devices, adjusting the signal-to-noise ratio requirements for retransmissions to ensure successful packet delivery and improve overall throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a higher transmission rate is selected to achieve greater bandwidth, then data throughput is improved, but the transmission reliability deteriorates due to shorter range and higher SNR requirements
Solution Approach 1:
The patent implements dynamic rate adaptation by continuously monitoring channel conditions (SNR, packet error rate) and adjusting transmission rates accordingly. The system transitions from static rate selection to dynamic rate adjustment, allowing the transmission rate to adapt to changing channel conditions in real-time, thus resolving the contradiction between throughput and reliability
Solution Approach 2:
The system changes the transmission rate parameter based on observed channel conditions. By monitoring packet error rates and SNR levels, the system adjusts the transmission rate parameter to optimize both throughput and reliability, selecting higher rates when conditions permit and lower rates when reliability is compromised
2Productivity
If immediate lower data rates are used for retransmissions to maintain throughput, then data rate is preserved, but transmission reliability deteriorates for fast-moving devices due to rapid channel condition changes
Solution Approach 1:
The system performs preliminary rate adaptation by proactively adjusting transmission rates based on predicted channel conditions for fast-moving devices. By anticipating channel degradation before it occurs (based on device velocity and movement patterns), the system selects more conservative rates in advance, ensuring retransmission reliability while maintaining throughput
Solution Approach 2:
The system implements feedback mechanisms by monitoring retransmission outcomes and channel conditions, then using this information to adjust future transmission rates. The feedback loop allows the system to learn from past retransmission successes and failures, optimizing the balance between throughput and reliability for moving devices
3Productivity
If the first selected high data rate is used for initial transmission to maximize bandwidth utilization, then data throughput is improved, but transmission reliability deteriorates due to signal degradation from distance and interference
Solution Approach 1:
The system dynamically adjusts the initial transmission rate based on real-time channel quality indicators before transmission begins. Rather than always selecting the maximum available rate, the system adapts the initial rate to current SNR conditions, ensuring both high bandwidth utilization when possible and reliable delivery when channel conditions are poor
Data Source
AI summary
The present disclosure is directed generally to systems and methods for dynamically selecting a retransmission rate for communication between two devices. The retransmission rate may be selected after a transmission has failed between the devices. In some embodiments, the retransmission rate may be selected based on relative velocity of the devices. In some embodiments, the retransmission rate may be selected based on transmission channel characteristics. The retransmission rate may be selected such that the retransmission will be less than an allowable transmission rate based on a distance between the two devices.