Dynamic RU Allocation for MU-OFDMA Throughput
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Solution Overview
Problem
Current Multi-User (MU) downlink Orthogonal Frequency Division Multiple Access (OFDMA) technologies face inefficiencies in resource unit (RU) allocation, leading to high delays and reduced throughput in dense environments, particularly in multi-dwelling units where overlapping Basic Service Sets (BSSs) and high traffic demands result in poor Quality of Experience (QoE) and increased overheads.
Innovation Solution
Implementing a traffic-aware and congestion-aware RU size selection algorithm that dynamically adjusts RU sizes based on traffic rates, queue lengths, and access delays to optimize RU allocation for each station, ensuring efficient utilization of transmission opportunities (TxOP) and meeting heterogeneous throughput requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional fixed-size RU allocation is used in MU-OFDMA, then device complexity is reduced, but throughput decreases and delays increase in dense environments
Solution Approach 1:
The patent implements dynamic RU size selection that adapts to changing traffic conditions and network congestion levels. The system transitions from fixed-size RU allocation to variable-size RU allocation based on real-time parameters including traffic rate, queue length, and congestion indicators, thereby optimizing throughput while managing complexity through adaptive control
Solution Approach 2:
The patent changes the parameter of RU size from a fixed value to a variable parameter that is adjusted based on traffic rate, queue length, and congestion conditions. This parameter change enables the system to optimize resource allocation efficiency and throughput by matching RU sizes to actual demand conditions
2Productivity
If larger RU sizes are allocated to meet high traffic demands, then throughput increases, but access delays increase
Solution Approach 1:
The system dynamically adjusts RU sizes based on real-time traffic conditions and queue lengths. When queue length is low and traffic rate is moderate, smaller RU sizes are selected to reduce access delays. When traffic demand increases, RU sizes are expanded to improve throughput, creating a dynamic balance between delay and throughput optimization
Solution Approach 2:
The patent implements feedback mechanisms that monitor traffic rate, queue length, and congestion parameters to continuously adjust RU allocation decisions. This feedback loop enables the system to respond to changing conditions and optimize the trade-off between access delay and throughput based on actual network state
3Reliability
If RU allocation is optimized for each station based on traffic conditions, then QoE improves, but device complexity and overhead increase
Solution Approach 1:
The patent uses parameter changes to simplify the allocation algorithm by basing RU size selection on key observable parameters such as traffic rate, queue length, and congestion indicators. This approach improves QoE through condition-aware allocation while managing complexity by focusing on essential parameters rather than complex multi-dimensional optimization
Solution Approach 2:
The system enables stations to self-adjust their RU allocations based on their own traffic conditions and network state. Each station can autonomously determine appropriate RU sizes based on its traffic rate and queue length, reducing the need for complex centralized control and lowering overall system complexity while maintaining improved QoE
Data Source
AI summary
For example, a wireless communication device may be configured to determine a Resource Unit (RU) allocation of a plurality of RUs to a plurality of wireless communication stations (STAs), respectively, the RU allocation to allocate to a STA of the plurality of STAs an RU of the plurality of RUs, wherein an RU size of the RU allocated to the STA is based at least on a traffic rate parameter, which is dependent on a traffic rate of Downlink (DL) traffic for the STA; and to transmit a Multi-User (MU) DL Orthogonal-Frequency-Division-Multiple-Access (OFDMA) Physical-layer Protocol Data Unit (PPDU) to the plurality of STAs according to the RU allocation.