Unequal Modulation Coding Scheme Allocation for MU-MIMO 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 both primary and secondary channels, leading to signal-to-noise ratio (SNR) imbalances and reduced performance.
Innovation Solution
Implementing an Unequal Modulation and Coding Scheme (MCS) allocation, where different MCSs are assigned to various segments of a Resource Unit (RU) or Multiple Resource Unit (MRU), specifically using the Enhanced DMG (EDMG) STA to support multiple MCSs over frequency sub-blocks and spatial streams, optimizing SNR conditions for improved throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single MCS is used across both primary and secondary channels, then device complexity and signaling overhead are reduced, but throughput efficiency deteriorates due to SNR imbalances
Solution Approach 1:
The patent divides the Resource Unit (RU) into multiple segments corresponding to different frequency sub-blocks (e.g., primary channel and secondary channels). Each segment is independently assigned its own MCS index, allowing different modulation and coding schemes to be applied to different segments based on their respective SNR conditions. This segmentation enables optimized throughput for each channel while maintaining manageable complexity through structured signaling.
Solution Approach 2:
The patent applies local quality by assigning different MCS characteristics to different frequency sub-blocks based on their local SNR conditions. Each segment of the RU can have its own MCS index selected from a codebook, allowing the system to adapt the modulation order and coding rate locally to match the channel quality of each specific frequency sub-block, thereby optimizing overall throughput.
2Productivity
If different MCSs are assigned to various segments of RU, then throughput efficiency is improved by adapting to SNR conditions, but device complexity and signaling overhead increase
Solution Approach 1:
The patent implements dynamic MCS allocation where the MCS index for each RU segment can be adjusted based on current channel conditions. The system dynamically selects MCS indices from a codebook for different frequency sub-blocks, allowing adaptive optimization of throughput as SNR conditions change over time, while maintaining flexibility in resource allocation.
Solution Approach 2:
The patent changes the MCS parameters (modulation order and coding rate) for different frequency sub-blocks based on their respective SNR conditions. By selecting different MCS indices from a codebook for different segments of the RU, the system adjusts the transmission parameters locally to match channel quality, thereby improving throughput efficiency without requiring complete redesign of the communication framework.
3Productivity
If multiple MCSs are supported over frequency sub-blocks, then SNR optimization and data transfer rates are improved, but signaling format complexity increases
Solution Approach 1:
The patent applies partial action by introducing UEM indication fields only when unequal MCS allocation is actually needed, rather than always transmitting full MCS information for all segments. The signaling format includes optional UEM indication fields that are activated selectively, allowing the system to maintain backward compatibility and reduce signaling overhead when equal MCS allocation suffices, while enabling enhanced functionality when required.
Data Source
AI summary
For example, an Access Point (AP) may be configured to set a user specific field in a Signal (SIG) field. For example, the user specific field may be configured for a user of a plurality of users in a Multi-User (MU) Multiple-Input-Multiple-Output (MIMO) (MU-MIMO) allocation. For example, the user specific field for the user may include an Unequal Modulation and Coding Scheme (MCS) (UEM) information subfield configured to indicate an assignment of a plurality of MCSs for the user. For example, the user specific field for the user may include a spatial configuration subfield configured to indicate a number of spatial streams for the user and a total number of spatial streams in the MU-MIMO allocation. For example, the AP may be configured to transmit a Physical layer (PHY) Protocol Data Unit (PPDU) including the SIG field.