Multi-RU OFDMA Modulation Coding for Channel-Variant Links
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Solution Overview
Problem
Existing wireless network technologies, such as IEEE 802.11be, face inefficiencies in channel utilization due to varying channel conditions across multiple resource units (RUs) within a wide bandwidth, leading to suboptimal modulation and coding schemes that do not account for the specific link conditions of each RU.
Innovation Solution
Implementing independent modulation and coding schemes for each RU based on its specific link conditions, with differentiated modulation types and code rates, and including RU-specific information in the header of data units to optimize channel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single MCS is used for all RUs assigned to a station, then device complexity is reduced, but channel efficiency deteriorates due to varying link conditions across different RUs
Solution Approach 1:
The patent segments the MCS configuration by allowing different MCS indices to be assigned to different RUs for the same station. This segmentation enables independent optimization of modulation and coding for each RU based on its specific link conditions, resolving the contradiction between simplified configuration and channel efficiency.
Solution Approach 2:
The patent applies local quality by allowing each RU to have its own MCS index tailored to the specific link conditions of that RU. This localized optimization ensures that each RU operates at optimal performance levels rather than using a uniform MCS across all RUs.
2Difficulty of detecting and measuring
If channel conditions are averaged over all resources, then measurement complexity is reduced, but modulation accuracy deteriorates due to masking of individual RU conditions
Solution Approach 1:
The patent segments the channel measurement process by evaluating link conditions independently for each RU rather than averaging across all resources. This segmentation preserves the specific characteristics of each RU's channel conditions, enabling more accurate MCS selection for each individual RU.
Solution Approach 2:
The patent applies local quality by performing channel measurements and MCS selections locally for each RU based on its specific link conditions. This approach ensures that the unique channel characteristics of each RU are captured and utilized for optimal MCS selection.
3Productivity
If multiple RUs are allocated to one station, then resource utilization is improved, but modulation and coding optimization deteriorates due to inability to account for individual RU link conditions
Solution Approach 1:
The patent segments the MCS configuration to allow independent optimization for each RU while maintaining multi-RU allocation to the same station. This segmentation enables both high resource utilization through multi-RU allocation and adaptive optimization through RU-specific MCS indices.
Solution Approach 2:
The patent applies local quality by allowing each RU to have its own MCS index tailored to its specific link conditions, even when multiple RUs are allocated to the same station. This enables simultaneous achievement of high resource utilization and adaptive modulation and coding optimization.
Data Source
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AI summary
Methods and devices for transmitting data in an Orthogonal Frequency-Division Multiple Access (OFDMA) wireless local area network, comprising: selecting, for a first resource unit assigned to the target station, a first modulation type; selecting, for a second resource unit assigned to the target station, a second modulation type different from the first modulation type; and modulating coded data and mapping the modulated data onto subcarriers associated with the assigned resource units based on the respective modulation types selected for each of the assigned resource units.