Fast Rate Adaptation Protocol for WLAN Link Optimization
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Solution Overview
Problem
Traditional link adaptation processes in wireless local area networks (WLANs) are inefficient and iterative, requiring multiple packets and feedback to converge on an optimal transmission rate, which can be slow and wasteful of airtime, especially as channel conditions change.
Innovation Solution
The implementation of a fast rate adaptation (FRA) protocol that uses a link adaptation test packet to quickly determine optimal transmission rate options by measuring link quality metrics, allowing for the selection of a suitable transmission rate for subsequent packets without the need for extensive iterative adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional iterative link adaptation processes are used to determine optimal transmission rates, then transmission reliability is improved through feedback-based adjustments, but airtime efficiency deteriorates due to multiple packets and extended convergence time
Solution Approach 1:
The patent applies preliminary action by performing link quality measurements and determining optimal transmission rates before actual data transmission begins. The access point sends test packets and receives feedback packets in advance to establish the optimal rate, eliminating the need for iterative adjustments during data transmission and thereby preserving airtime efficiency while maintaining transmission reliability.
2Measurement precision
If multiple packets are used in traditional link adaptation to converge on optimal transmission rates, then measurement precision is improved through iterative feedback, but time consumption increases due to extended convergence processes
Solution Approach 1:
The patent performs link quality measurements and optimal rate determination in a preliminary phase before data transmission. By sending test packets and processing feedback packets in advance, the system achieves precise link quality measurements without the time penalty of iterative convergence during actual data transmission, thus resolving the contradiction between measurement precision and time consumption.
Solution Approach 2:
The patent segments the link adaptation process into distinct phases: a test packet transmission phase for measurement, a feedback packet transmission phase for rate determination, and a data transmission phase using the pre-determined optimal rate. This segmentation allows precise measurements to be made in isolation without consuming airtime during data transmission, resolving the contradiction between measurement precision and time efficiency.
3Adaptability or versatility
If extensive iterative adjustments are performed to determine optimal transmission rates, then adaptability is improved through continuous optimization, but productivity deteriorates due to reduced airtime availability for actual data transmission
Solution Approach 1:
The patent performs the adaptive rate determination process in advance before data transmission begins. By completing all necessary measurements and optimizations in the preliminary phase using test and feedback packets, the system achieves full adaptability without sacrificing productivity during actual data transmission, as the optimal rate is already established and ready for immediate use.
Data Source
AI summary
This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer-readable media, for a link adaptation protocol in a wireless local area network (WLAN). In one aspect, the link adaptation protocol may be used to select a transmission rate option (such as a modulation and coding scheme (MCS)) for communications from a first WLAN device to a second WLAN device based on wireless channel conditions. This disclosure includes several example message sequences for the link adaptation protocol which can accommodate a variety of uplink or downlink data transmission designs, including single user (SU) and multi-user (MU) transmissions. The example message sequences may be used with orthogonal frequency division multiple access (OFDMA), multiple-input-multiple-output (MIMO), and beamformed transmissions.