Unequal MCS Allocation for Wireless Throughput
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in throughput due to the use of a single Modulation and Coding Scheme (MCS) across all segments of a Resource Unit (RU) or Multiple Resource Unit (MRU), leading to SNR imbalances and reduced performance, especially when primary and secondary channels employ different clear channel assessment methods.
Innovation Solution
Implementing an Unequal Modulation and Coding Scheme (UEM) allocation, where different MCSs are assigned to various segments of an RU/MRU based on signal-to-noise ratio (SNR) conditions, and utilizing user-specific fields in signaling to support unequal MCS assignments over frequency sub-channels and spatial streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single MCS is used across all segments of an RU/MRU, then the system complexity is reduced and ease of operation is improved, but the throughput and data transmission efficiency deteriorate due to SNR imbalances
Solution Approach 1:
The patent divides the Resource Unit (RU) into multiple segments or sub-RUs, each capable of being assigned a different MCS. This segmentation allows the system to apply unequal MCS allocation across different portions of the RU based on their respective SNR conditions, thereby resolving the contradiction between operational simplicity and throughput optimization.
Solution Approach 2:
The patent implements local quality by assigning different MCS values to different segments of the RU based on their specific SNR characteristics. Each segment receives an MCS tailored to its local channel conditions, optimizing the overall system throughput while maintaining manageable complexity through structured allocation.
2Productivity
If unequal MCS allocation is implemented across RU segments, then the throughput and data transmission efficiency are improved by matching SNR conditions, but the device complexity and signaling overhead increase
Solution Approach 1:
The patent introduces dynamic MCS allocation where the MCS for each RU segment can be adjusted based on varying SNR conditions. This dynamic approach enables the system to adapt to changing channel conditions and optimize throughput, while the complexity is managed through structured signaling mechanisms that provide flexibility without excessive overhead.
Solution Approach 2:
The patent changes the MCS parameter differently across various segments of the RU based on their SNR characteristics. By allowing the MCS parameter to vary locally rather than being uniform, the system achieves higher throughput while the complexity increase is confined to the parameter allocation layer rather than affecting the entire system architecture.
3Adaptability or versatility
If different MCSs are assigned to frequency sub-channels, then the adaptability to varying SNR conditions is improved, but the signaling complexity and difficulty of detecting and measuring increase
Solution Approach 1:
The patent extends the MCS allocation concept into the frequency dimension by assigning different MCS values to different frequency sub-channels or segments within an RU. This dimensional expansion allows the system to adapt to frequency-selective fading and varying SNR conditions across the spectrum, while the signaling complexity is managed through structured frequency-domain allocation patterns.
Data Source
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AI summary
For example, an Access Point (AP) may be configured to set Resource Unit (RU) allocation information in a Signal (SIG) field, the RU allocation information configured to indicate an RU allocation for a user; to set Unequal Modulation and Coding Scheme (MCS) (UEM) information for the user in the SIG field, the UEM information for the user configured to indicate an assignment of a plurality of MCSs to a plurality of frequency sub-channels in the RU allocation for the user, respectively; and to transmit a Downlink (DL) Physical layer (PHY) Protocol Data Unit (PPDU) including the SIG field and a data field for the user, wherein the data field for the user is configured according to the assignment of the plurality of MCSs to the plurality of frequency sub-channels in the RU allocation for the user.