Coordinated TDMA Time-Frequency Allocation for Wi-Fi Throughput
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Solution Overview
Problem
The existing TXOP sharing framework in Wi-Fi systems limits traffic throughput and is inefficient in channel utilization as it only allocates time resources without considering available frequency resources, thereby restricting communication efficiency.
Innovation Solution
Implementing a coordinated TDMA mechanism that allows an access point (AP) to allocate non-overlapping time and frequency resources within a TXOP duration to multiple stations, including both AP stations and non-AP stations, enhancing channel utilization and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the existing TXOP sharing framework allocates time resources to only one STA at a time, then the allocation simplicity is maintained, but the traffic throughput is limited and channel utilization is inefficient
Solution Approach 1:
The patent segments the TXOP into multiple time slots and assigns different frequency channels to different STAs within the same TXOP duration. This allows multiple STAs to transmit simultaneously on different channels, thereby increasing traffic throughput without requiring complex centralized coordination for sequential access.
Solution Approach 2:
The patent introduces frequency channel as an additional dimension to time-based TXOP sharing. Instead of only time-division multiplexing one STA at a time, the system now employs time-frequency resource allocation, allowing multiple STAs to transmit concurrently on different frequency channels within the same TXOP, thus improving channel utilization and throughput.
2Productivity
If time resources are allocated without considering available frequency resources, then the allocation process is simple, but channel utilization is inefficient
Solution Approach 1:
The patent merges time-division and frequency-division multiplexing into a unified resource allocation mechanism. The TXOP allocation frame simultaneously specifies multiple time slots and their corresponding frequency channels, allowing the system to exploit both temporal and spectral resources for concurrent transmissions, thereby improving overall channel utilization efficiency.
Solution Approach 2:
The patent implements dynamic resource allocation where the AP can flexibly assign different frequency channels to different STAs based on real-time channel conditions and traffic requirements. This dynamic time-frequency resource allocation optimizes channel utilization by adapting to varying network conditions without requiring overly complex static planning.
3Reliability
If multiple STAs share the same frequency channel within TXOP, then the allocation is simple, but interference from hidden nodes increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple channels and assigns non-overlapping channels to different STAs within the same TXOP. This frequency domain segmentation prevents hidden node interference by ensuring that STAs transmitting simultaneously are on different frequency channels, thereby eliminating co-channel interference without requiring complex interference avoidance protocols.
Data Source
AI summary
A wireless communication device receives from a sharing access point (AP) station, a transmission opportunity (TXOP) allocation frame. The TXOP allocation frame includes information indicating a first shared duration of a TXOP and one or more first shared channels which the sharing AP station allocates to the wireless communication device. The first shared duration of the TXOP is within a duration of the TXOP acquired by the sharing AP station. The one or more first shared channels are a subset of a plurality of channels for which the sharing AP station acquired the TXOP. The wireless communication device performs wireless communication using the one or more first shared channels in the first shared duration of the TXOP.