Fine Timing Measurement Resource Allocation in Wi-Fi Networks
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in exchanging timing information between access points and stations, particularly in scheduling data transmissions, due to limitations in the exchange of control information, which affects data exchange efficiency in wireless local area networks (WLANs) and Wi-Fi networks.
Innovation Solution
Implementing a method that involves the transmission of trigger frames to indicate available resource units for contention-based access, decoding initial fine timing measurement request frames, and allocating resource units for fine timing measurement protocols, enabling efficient timing information determination through orthogonal frequency division multiple access (OFDMA) and multi-user (MU) techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional control information exchange methods are used for timing information, then the existing protocol can be maintained, but the data exchange efficiency and timing determination accuracy deteriorate
Solution Approach 1:
The patent segments the control information exchange into distinct phases: trigger frame transmission for resource allocation, FTM request frame exchange for timing initiation, and FTM measurement frame exchange for timing determination. This segmentation allows each phase to be optimized independently, improving overall data exchange efficiency while maintaining manageable protocol complexity.
Solution Approach 2:
The patent implements preliminary action by allocating resource units (RUs) in advance through trigger frames before the actual FTM measurement exchange occurs. This pre-allocation of time-frequency resources eliminates contention and collision during the measurement phase, thereby improving data exchange efficiency and timing determination accuracy.
2Adaptability or versatility
If resource units are allocated for contention-based access, then more STAs can access the channel, but timing measurement accuracy and resource allocation efficiency worsen due to contention
Solution Approach 1:
The patent implements dynamic resource allocation where the AP can adjust RU allocation based on STA requirements and network conditions. During FTM measurements, resources are dynamically assigned to specific STAs rather than using static contention-based access, enabling both high STA accessibility and precise timing measurement by adapting the allocation strategy to the measurement phase.
3Measurement precision
If more control information is exchanged for timing determination, then timing accuracy improves, but the time and resources consumed increase
Solution Approach 1:
The patent merges the timing measurement information with data transmission frames. FTM measurement data is embedded within the same resource units used for data exchange, allowing timing determination without requiring separate dedicated measurement exchanges. This combining approach achieves accurate timing measurement while minimizing additional time and resource consumption.
Data Source
AI summary
Embodiments of an access point (AP), station (STA) and methods of communication are generally described herein. The AP may transmit a trigger frame (TF) that indicates resource units (RUs) that are available for contention based access by STAs for a fine timing measurement (FTM) protocol. The AP may attempt to decode one or more initial fine timing measurement request (iFTMR) frames received in the indicated RUs. The AP may transmit a broadcast acknowledgement (ACK) frame that indicates whether at least one iFTMR frame was decoded. The AP may, for a decoded iFTMR frame: allocate the RU corresponding to the decoded iFTMR frame to a corresponding STA for the FTM protocol; and transmit, in the corresponding RU, an initial fine timing measurement (iFTM) frame that includes an identifier of the corresponding STA.