OFDMA Resource Unit Configuration for Downlink Throughput
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Solution Overview
Problem
In high-density Wi-Fi scenarios, existing OFDMA configurations face challenges in maximizing downlink throughput due to transmit and receive impairments, necessitating an innovative method to properly assign modulation and coding schemes, transmission power levels, and resource unit sizes to optimize performance.
Innovation Solution
A multi-user downlink OFDMA configuration method that applies setting constraints to resource unit size, modulation and coding scheme, and transmission power assignments, using monotonic functions to ensure efficient allocation and maximize throughput across multiple users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple users are served concurrently in high-density scenarios, then system capacity and user coverage are improved, but downlink throughput deteriorates due to transmit and receive impairments
Solution Approach 1:
The patent applies local quality by assigning different modulation and coding schemes (MCS) to different resource units (RUs) based on user-specific channel conditions. Each user receives customized MCS configuration tailored to their specific impairment levels, allowing the system to maintain high throughput for users with good channel conditions while providing robust service to users experiencing impairments, thereby optimizing overall system capacity without sacrificing individual user throughput.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting MCS parameters (modulation order, coding rate), transmission power levels, and RU size allocations based on real-time channel state information and impairment measurements. The AP modifies these parameters adaptively for each user and resource unit to maximize throughput while accounting for transmit impairments (intermodulation, harmonic distortion) and receive impairments (thermal noise, phase noise), thus resolving the contradiction between serving more users and maintaining high throughput.
2Productivity
If resource allocation is optimized to maximize throughput, then downlink performance is improved, but system complexity increases due to multiple configuration parameters
Solution Approach 1:
The patent applies preliminary action by having the AP perform comprehensive channel characterization and impairment measurement before the actual data transmission. The AP预先 determines the optimal MCS, power, and RU size configurations based on pre-acquired channel state information, then communicates these configurations to users in advance. This preliminary optimization reduces the complexity during actual transmission by eliminating the need for real-time adaptive adjustments, thus maintaining high throughput while managing system complexity.
Solution Approach 2:
The patent implements feedback mechanisms where users report their received signal quality and impairment levels back to the AP. Based on this feedback, the AP adjusts MCS, power, and RU allocations for subsequent transmissions. This closed-loop feedback system enables the AP to optimize throughput dynamically while maintaining manageable complexity by making adjustments based on actual user experience rather than attempting to model all possible channel conditions in advance.
Data Source
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AI summary
A multi-user downlink orthogonal frequency-division multiple access (OFDMA) configuration method includes: assigning contiguous resource units (RUs) included in a channel to a plurality of stations, respectively; and assigning, by an access point (AP), one modulation and coding scheme (MCS) to each of the plurality of stations. Data rates of modulation and coding schemes that are assigned to first stations and associated with contiguous first RUs assigned to the first stations are monotonic, where the first stations are included in the plurality of stations.