FTM Protocol Capability Verification for Wireless Positioning
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Solution Overview
Problem
Existing Fine Timing Measurement (FTM) procedures in wireless communication networks face ambiguities and inefficiencies due to incompatible parameters between stations, leading to unnecessary message exchanges and increased network traffic.
Innovation Solution
A wireless transceiver system that processes FTM requests including minimum delta FTM value, number of bursts exponents value, and ASAP value, and sends appropriate response messages to terminate or continue FTM sessions based on capability, reducing incompatible message exchanges and network traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If FTM requests with multiple parameter combinations are exchanged between stations, then positioning accuracy can be improved, but network traffic increases and message exchange efficiency decreases
Solution Approach 1:
The patent applies preliminary action by having the responding station evaluate its capability to meet FTM parameters (minimum delta FTM value, number of bursts exponents value, ASAP value) before engaging in full message exchanges. The station determines compatibility in advance and sends an appropriate response message (first type indicating termination or second type indicating continuation with status value), preventing unnecessary message exchanges and reducing network traffic while maintaining positioning accuracy capability
2Ease of operation
If FTM message exchanges continue without capability verification, then message exchange simplicity is maintained, but ambiguous interpretations occur and positioning reliability decreases
Solution Approach 1:
The patent resolves this contradiction by performing capability verification as a preliminary action before full FTM positioning exchanges. The responding station checks whether it can meet the requested parameters and communicates this capability status through standardized response messages. This preliminary check eliminates ambiguities in parameter interpretation while maintaining operational simplicity through standardized message types, thereby improving positioning reliability without significantly complicating the message exchange process
Solution Approach 2:
The patent applies feedback by having the responding station send response messages that provide clear feedback about its capability to meet FTM parameters. The response messages include status values that indicate whether the session should terminate or continue, giving the initiating station definitive information about compatibility. This feedback mechanism eliminates ambiguous interpretations and ensures reliable positioning operations
Data Source
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AI summary
Techniques for positioning with Fine Timing Measurement (FTM) messages are disclosed. An example of a wireless transceiver system for providing a FTM response message is configure to receive a FTM request from an initiating station, the FTM request may include a minimum delta FTM value, a number of bursts exponents value, and a As Soon As Possible (ASAP) value. The transceiver may send a first FTM response message indicating the FTM session is terminated if the wireless transceiver is incapable of meeting the minimum delta FTM value and the number of bursts exponents value, and send a second FTM response message including a status value based on the ASAP value in the FTM request if the wireless transceiver is capable of meeting the minimum delta FTM value and the number of bursts exponents value.