Rate Adaptation via MCS Reception Margin in Wi-Fi Networks
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Solution Overview
Problem
In high-density wireless network deployments, existing Wi-Fi technologies face inefficiencies due to high data rate competition among many devices, leading to suboptimal performance in scenarios like hotspots and cellular offloading, where low to moderate data rates are sufficient, and there is a need for improved system efficiency rather than just higher data rates.
Innovation Solution
The implementation of High Efficiency (HE) Wireless Local Area Network (WLAN) techniques, including scheduled orthogonal frequency-division multiple access (OFDMA) and other non-contention based multiple access methods, allowing for efficient communication through HE control periods, where a master station schedules HE devices and uses HE packet formats with legacy devices communicating via legacy standards during other periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high data rate transmission is prioritized in wireless networks, then individual device performance improves, but system efficiency deteriorates in high-density deployments
Solution Approach 1:
The patent segments the wireless network into different operational modes: HE (High Efficiency) mode for high-density scenarios with scheduled access and OFDMA, and legacy mode for traditional scenarios. This segmentation allows the system to choose the appropriate mode based on deployment requirements, preventing the dominance of high data rate competition that harms overall system efficiency.
Solution Approach 2:
The patent introduces dynamic rate adaptation mechanisms where the AP can adjust MCS (Modulation and Coding Scheme) indices based on feedback from STAs about channel conditions and reception margins. This dynamic adjustment optimizes the balance between data rate and reliability, improving system efficiency without sacrificing individual device performance.
2Adaptability or versatility
If contention-based access is used for legacy devices, then compatibility is maintained, but system efficiency deteriorates in high-density scenarios
Solution Approach 1:
The patent introduces a dual-mode system where HE devices and legacy devices can coexist. The AP acts as an intermediary that can schedule HE devices during HE control periods using efficient OFDMA access, while legacy devices continue to use traditional contention-based access. This intermediary approach maintains compatibility with legacy devices while introducing efficient scheduled access for HE devices, resolving the contradiction between compatibility and system efficiency.
3Productivity
If scheduled OFDMA access is implemented for HE devices, then system efficiency improves in high-density environments, but device complexity increases
Solution Approach 1:
The patent segments the device set into HE-capable devices and legacy devices. Only HE devices need to implement the complex scheduled OFDMA access mechanisms, while legacy devices continue to use simple contention-based access. This segmentation limits the complexity burden to only those devices that benefit from high efficiency, reducing the overall impact on device complexity while maintaining system efficiency improvements.
Solution Approach 2:
The patent designs the HE system with universal compatibility features, allowing HE devices to operate in both scheduled OFDMA mode and legacy contention-based mode. This multi-functionality enables HE devices to adapt to different scenarios, reducing the need for completely new complex mechanisms while still providing scheduled access capabilities when needed.
Data Source
AI summary
Embodiments of a station (STA), access point (AP) and method for rate adaption are generally described herein. The STA may receive a medium access control protocol data unit (MPDU) encoded in accordance with a first modulation and coding scheme (MCS). The STA may detect bit errors of the MPDU based on a comparison between the received MPDU and the decoded MPDU. The STA may determine an MCS reception margin parameter based at least partly on a comparison between a number of detected bit errors and a predetermined threshold of bit errors. The STA may transmit a block acknowledgement (BA) frame that includes the MCS reception margin parameter. The MCS reception margin parameter may enable a rate adaptation, from the first MCS to a second MCS for a subsequent MPDU for the STA.