MCS Feedback Link Adaptation Reference Payload
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Solution Overview
Problem
Existing IEEE 802.11 systems lack an appropriate reference for transmitting WLAN devices to properly interpret and utilize Modulation Coding Scheme (MCS) feedback, leading to suboptimal performance due to varying transmission properties and payload sizes.
Innovation Solution
A method is implemented where a network device selects an MCS with the highest data rate that results in a frame error rate less than or equal to a threshold, using a reference payload size known to both devices, and includes this selection in the MAC header for proper interpretation and adjustment during transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If MCS feedback is provided without a reference payload size, then the feedback can be transmitted, but the transmitting device cannot properly interpret and utilize the feedback leading to suboptimal performance
Solution Approach 1:
The patent introduces a reference payload size as an intermediary element that mediates between the receiving device's MCS recommendation and the transmitting device's interpretation. This reference value serves as a common basis that enables the transmitting device to properly understand and apply the MCS feedback by comparing actual transmission conditions against this standardized reference, thereby resolving the interpretation problem without complicating the feedback mechanism itself
2Device complexity
If link adaptation is performed without considering varying transmission properties and payload sizes, then the system complexity is reduced, but the transmission performance deteriorates
Solution Approach 1:
The patent applies parameter changes by introducing a reference payload size parameter that standardizes the basis for MCS selection. Instead of adapting to every varying transmission condition, the system changes the reference framework to a fixed payload size, allowing the transmitting device to adjust its interpretation based on the ratio between the reference payload size and actual payload size. This approach maintains relatively simple link adaptation logic while improving transmission performance through parameter-based adjustment
Data Source
AI summary
A method implemented by a first network device in a Wireless Local Area Network (WLAN) to provide Modulation Coding Scheme (MCS) feedback. The method includes selecting an MCS that is determined to have a highest data rate among a plurality of available MCSes that when used to transmit a frame having a reference payload size over a wireless communications link between the first network device and a second network device results in a frame error rate that is less than or equal to a threshold error rate for a given set of transmission properties, generating a frame having a Media Access Control (MAC) header, wherein a control field of the MAC header includes an indication of the selected MCS, and transmitting the generated frame to the second network device through a wireless medium.


