Per-Resource Unit Modulation Coding in OFDMA Wi-Fi
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Solution Overview
Problem
The increasing bandwidth in next-generation Wi-Fi networks, such as IEEE 802.11be, poses challenges in optimizing channel efficiency due to varying channel conditions across subcarriers, leading to inefficient data transmission as existing methods use a single modulation and coding scheme for all resource units, which may not account for differing interference levels and signal quality.
Innovation Solution
The method involves selecting different modulation types and code rates for each resource unit based on specific link conditions, allowing for independent optimization of channel efficiency across subcarriers, thereby addressing variations in channel conditions and improving computational and network resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single modulation and coding scheme is used for all resource units, then device complexity is reduced and ease of operation is improved, but channel efficiency and data transmission performance deteriorate due to varying channel conditions across subcarriers
Solution Approach 1:
The patent segments the resource units into different groups (first RU group and second RU group) and applies different modulation and coding schemes to each group. Specifically, the first MCS is applied to the first RU group while the second MCS is applied to the second RU group, allowing independent optimization for each segment based on their respective channel conditions.
Solution Approach 2:
The patent implements local quality by allowing different modulation and coding schemes to be applied to different resource unit groups within the same transmission. The first MCS and second MCS can have different parameters (modulation order, coding rate) tailored to the local channel conditions of each RU group, optimizing performance for each specific region.
2Productivity
If different modulation and coding schemes are applied to different resource unit groups, then channel efficiency and data transmission performance are improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent divides resource units into distinct groups that can be independently processed with different MCS parameters. This segmentation allows the system to manage complexity by treating each group separately rather than requiring individual processing of every single RU, reducing the overall computational burden while still achieving optimization.
Solution Approach 2:
The patent employs a universal framework where the same basic MCS selection and application mechanism is used across different RU groups, but the parameters can be adjusted. This multi-functional approach allows the system to handle both single-MCS and multi-MCS scenarios using the same underlying process, reducing complexity compared to having entirely separate processing paths.
Data Source
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.