WLAN Spatial Reuse Rate Adaptation via Short Data Frame Probing
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Solution Overview
Problem
Existing wireless communication networks face challenges in maintaining network performance due to high interference levels in dense environments, where traditional rate adaptation mechanisms are not sufficiently responsive to transient reductions in Signal-to-Interference-plus-Noise Ratio (SINR during Spatial Reuse (SR) operations.
Innovation Solution
A method involving the use of short data frames to dynamically probe and adjust transmission rates on a per-packet basis, allowing for aggressive rate adaptation during SR, with the ability to increase or decrease rates based on the success of the short data frame transmission, thereby optimizing transmission parameters for robustness and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional rate adaptation mechanisms are used during Spatial Reuse operations, then network stability is maintained, but transmission throughput decreases due to inability to respond to transient SINR reductions
Solution Approach 1:
The patent implements dynamic rate adaptation by continuously probing channel conditions with short data frames and adjusting transmission rates in real-time based on instantaneous SINR measurements. This allows the system to transition from static, conservative rate selection to dynamic rate optimization that adapts to transient channel conditions during Spatial Reuse operations, thereby improving throughput without sacrificing reliability
Solution Approach 2:
The system employs feedback mechanisms where transmission outcomes (success/failure) of short data frames are used to update rate adaptation decisions. By monitoring acknowledgment receipts and channel quality indicators, the system learns from past transmissions and adjusts future rate selections, enabling reliable throughputs optimization in dynamic Spatial Reuse environments
2Productivity
If aggressive rate adaptation is implemented during Spatial Reuse, then spectrum efficiency improves, but transmission robustness decreases due to transient SINR reductions
Solution Approach 1:
The patent applies preliminary action by transmitting short probe data frames before committing to full data transmissions. These preliminary probes test channel conditions and predict transmission success, allowing the system to prepare appropriate rate selections in advance. This prevents wasteful transmissions at inappropriate rates while enabling aggressive rate adaptation when conditions are favorable
Solution Approach 2:
The system dynamically changes transmission parameters (modulation order, coding rate, transmit power) based on real-time channel assessments. By adjusting these parameters according to measured SINR and probe frame outcomes, the system optimizes spectrum efficiency while maintaining robustness through adaptive parameter selection rather than fixed conservative settings
3Measurement precision
If short data frames are used for probing, then rate adaptation precision improves, but network overhead increases due to additional probe transmissions
Solution Approach 1:
The patent applies partial action by using minimal-length data frames solely for probing purposes, transmitting only the necessary bits to assess channel conditions without carrying full payload data. This reduces the overhead impact of probe transmissions while maintaining sufficient precision for rate adaptation decisions, as the probe frames contain just enough information to evaluate channel quality
Data Source
AI summary
Systems and methods are provided for using a short data frame sent at a particular rate that can be used to probe a channel on which an access point is operating. The rate can be increased/decreased depending on whether or not transmission of the short data frame was successful or not. In this way, the highest possible rate (which can be impacted by any or all of the following factors: number of spatial streams, modulation and coding scheme, channel bandwidth, guard interval) can be selected to transmit data on the channel. In other words, a transmission rate can be selected dynamically and on a per-packet basis for a spatial reuse data frame that would follow the short data frame based on whether transmission of the short data frame was successful.