Multi-User FDMA Triggered TXOP Sharing for WLAN Interference Reduction
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Solution Overview
Problem
Current wireless communication technologies face limitations in efficiently allocating transmission opportunities (TXOP) for multiple users in wireless local area networks (WLANs), particularly in supporting peer-to-peer communications and reducing adjacent channel interference through simultaneous transmit and receive (STR) operations.
Innovation Solution
The implementation of a Multi-User Request-to-Send (MU-RTS) trigger frame with a triggered TXOP sharing mode subfield set to a non-zero value, allowing access points (APs) to allocate TXOPs for multiple devices to transmit physical layer protocol data units (PPDUs) simultaneously using Frequency Division Multiple Access (FDMA), enabling devices to choose their target peers for transmission without adjacent channel constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional TXOP allocation methods are used, then simple allocation is maintained, but allocation efficiency and throughput for multiple users deteriorate
Solution Approach 1:
The TXOP is segmented into multiple time portions, with each portion allocated to different computing devices for simultaneous transmissions. The AP divides the total TXOP duration into separate intervals, allowing multiple STAs to transmit in parallel without interfering with each other, thereby improving overall allocation efficiency and throughput.
Solution Approach 2:
The AP performs preliminary actions by buffering traffic for multiple STAs before the TXOP sharing begins. The AP maintains a queue of frames for each STA and prepares the TXOP allocation schedule in advance, enabling efficient multi-user transmissions without requiring real-time decision-making during the transmission process.
2Object-affected harmful factors
If adjacent channels are used for computing device operation, then channel allocation is simplified, but adjacent channel interference increases
Solution Approach 1:
Different computing devices are assigned different non-adjacent channels for their transmissions during the TXOP sharing period. The AP selects appropriate channel pairs for each STA based on their spatial separation and traffic characteristics, ensuring that devices closer together in space use farther apart channels to minimize interference, while maintaining flexible channel assignment for optimal performance.
3Productivity
If simultaneous transmit and receive operations are enabled, then communication throughput improves, but device complexity and coordination requirements increase
Solution Approach 1:
The AP acts as an intermediary that coordinates STR operations between multiple STAs. It manages the TXOP allocation, selects appropriate channels for simultaneous transmissions, and ensures that STAs can transmit and receive without interfering with each other. This intermediary role simplifies the complexity of STR operations by centralizing the coordination function.
Solution Approach 2:
The system dynamically adjusts channel assignments and TXOP allocations based on real-time conditions. The AP can modify which STAs transmit simultaneously, which channels they use, and how the TXOP is divided, allowing flexible adaptation to changing network conditions while maintaining high throughput and minimizing interference.
Data Source
AI summary
An access point (AP) may communicate with one or more computing devices (e.g., wireless devices and/or stations (STAs)). Computing devices may transmit without simultaneous transmit-receive (STR) operation, for example, by eliminating target computing device indications in a frame and/or by setting a target computing device rule for allocated computing devices. Instead of using adjacent channels for computing device operation, computing devices may use non-adjacent channels for transmitting and receiving in order to decrease adjacent channel interference.