Intelligent Reverse Direction Grants for WLAN Throughput
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Solution Overview
Problem
Reverse direction grants (RDGs) in wireless local area networks (WLANs) are not intelligently used, leading to inefficiencies in data throughput due to unawareness of the amount of network layer data to be sent by stations, resulting in unnecessary acquisition or relinquishment of transmission opportunities, which wastes time on the wireless medium.
Innovation Solution
Implementing queue size based intelligent RDGs by using traffic identifier (TID) counters to track pending data transmission and calculating TXOP durations based on TID counter values, ensuring that the TXOP duration is exactly long enough to complete data transfer between stations, thereby optimizing the use of transmission opportunities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reverse direction grants are implemented in WLANs, then overhead is reduced and data throughput is increased, but the grants are not intelligently used leading to unnecessary acquisition or relinquishment of transmission opportunities which wastes time on the wireless medium
Solution Approach 1:
The patent implements feedback mechanisms where stations monitor queue sizes and use this information to intelligently decide when to acquire or relinquish transmission opportunities. The Access Point tracks station queue states and provides feedback through RDG frames, enabling stations to make informed decisions about TXOP acquisition based on actual data availability, thereby avoiding unnecessary medium access and reducing idle time.
Solution Approach 2:
Stations autonomously monitor their own queue sizes and make self-service decisions about when to request or release transmission opportunities without continuous AP intervention. The system enables stations to self-manage their TXOP acquisitions based on their buffer states, reducing overhead while preventing wasteful medium access through intelligent queue-based control.
2Device complexity
If traditional RDGs are used without queue size awareness, then implementation is simpler, but stations acquire or relinquish TXOPs unnecessarily wasting wireless medium time
Solution Approach 1:
The patent implements preliminary action by having stations monitor and report queue sizes before TXOP acquisition decisions are made. The Access Point uses pre-collected queue state information to intelligently grant RDGs, preventing unnecessary TXOP acquisitions before they occur. This advance knowledge eliminates wasteful medium access while maintaining manageable implementation complexity through structured queue monitoring.
3Ease of operation
If TXOP durations are not aligned with actual data transfer needs, then grant management is simpler, but idle time on the wireless medium increases reducing effectiveness
Solution Approach 1:
The patent implements dynamic TXOP duration adjustment based on real-time queue sizes. Instead of fixed or static grant durations, the system dynamically calculates optimal TXOP lengths using monitored queue states, ensuring transmission opportunities are precisely aligned with actual data transfer requirements. This dynamic adaptation maximizes wireless medium utilization while maintaining ease of operation through automated duration calculation.
Data Source
AI summary
The present disclosure is directed to methods and apparatuses for increasing throughput of WLANs using queue size based intelligent reverse direction grants (RDGs). RDGs have been introduced in many WLANs to reduce the amount of overhead associated with variants of the CSMA/CD MAC protocol. Reducing overhead increases the WLANs achievable data throughput. However, RDGs are not intelligently used in WLANs, limiting their effectiveness.