Wi-Fi Ranging via Encrypted Data Frames
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Solution Overview
Problem
Existing Wi-Fi ranging protocols face challenges in balancing security and throughput, particularly in urban areas with high concentrations of Wi-Fi access points.
Innovation Solution
The proposed solution involves using data frames for ranging operations instead of dedicated Fine Timing Measurement (FTM) or Null Data Packet (NDP) frames, ensuring that ranging measurement information is encapsulated within encrypted data frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If security measures are implemented in Wi-Fi ranging operations, then security is improved, but throughput decreases
Solution Approach 1:
The patent applies multi-functionality by enabling data frames to serve dual purposes: both data communication and ranging operations. By incorporating ranging measurement information (timestamps, sequence numbers) directly into data frames, the system eliminates the need for separate dedicated ranging frames, thereby maintaining security through encryption while improving throughput through frame reuse.
Solution Approach 2:
The patent merges the ranging operation with the data communication process by combining ranging measurement information with data frames. This integration allows the system to perform both secure data transmission and ranging measurements simultaneously using the same frame structure, resolving the contradiction between security requirements and throughput efficiency.
2Measurement precision
If dedicated FTM or NDP frames are used for ranging, then ranging accuracy is improved, but throughput is reduced due to additional frame overhead
Solution Approach 1:
The patent makes data frames universal by enabling them to perform both data communication and ranging functions. By embedding ranging measurement information (timestamps, sequence numbers) within data frames, the system eliminates the need for separate dedicated ranging frames like FTM or NDP frames, thereby maintaining ranging accuracy while significantly improving throughput through frame reuse.
Solution Approach 2:
The patent combines the ranging measurement function with the data frame structure, merging two previously separate operations into a single frame type. This integration allows the system to achieve accurate ranging without the throughput penalty associated with dedicated ranging frames, as the same frames carry both data and ranging information.
Data Source
AI summary
Ranging operations may be performed between an initiator device and a responder device using data frames as opposed to fine timing measurement (FTM) frames or Null Data Packet (NDP) frames. An initiator device may request the responder device to perform a ranging operation. The responder device may transmit a data frame to the initiator device and may receive an acknowledgement (ACK) frame from the responder device. The responder device may transmit a second data frame to the initiator device that includes ranging measurement information for the previous message exchange, including a time of departure of the data frame and a time of arrival of the ACK frame. Because data frames are encrypted, the ranging measurement information is provided in a secure manner. Moreover, by including the ranging measurement information in data frames, throughput for the ranging procedure is improved.