Multi-Device RTT Measurement for Separating Transmission Delays
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Solution Overview
Problem
Existing methods struggle to accurately measure the time required for transmission and response processing in communication devices, which hinders precise distance estimation based on round-trip time (RTT) measurements.
Innovation Solution
An information processing device and method that calculates the time required for transmission and response processing by solving simultaneous linear equations using measured response times across multiple communication devices, identifying relationships and estimating unknown times to refine RTT measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RTT measurement is performed using conventional methods, then the round-trip time can be measured, but the transmission processing time and response processing time cannot be accurately separated
Solution Approach 1:
The patent segments the total RTT measurement into three distinct components: transmission processing time (Ts), propagation time (Tc), and response processing time (Tr). By introducing multiple measurement packets with different sequences and directions, the system can separately calculate each component through systematic equation solving, thereby achieving precise measurement of individual time components that were previously indistinguishable.
Solution Approach 2:
The patent introduces measurement packets with specific sequence numbers and direction identifiers as intermediaries to facilitate time measurement. These packets carry timing information and are used to establish mathematical relationships between different measurement points, enabling the calculation of transmission and response processing times without requiring direct access to internal device clocks or processing states.
2Measurement precision
If multiple measurement packets are used to separate transmission and response times, then measurement precision improves, but the complexity of the measurement process increases
Solution Approach 1:
The patent employs periodic transmission of measurement packets in both directions between devices. By systematically sending packets with incrementing sequence numbers at regular intervals, the system creates a predictable pattern of measurements that can be processed through standardized calculations, reducing operational complexity despite the multiple packets involved.
Solution Approach 2:
The measurement system incorporates feedback mechanisms where each device records arrival times and sequence numbers of received packets, then uses this feedback information to calculate and report transmission and response processing times. The systematic use of sequence numbers provides feedback that enables automatic calculation without manual intervention, simplifying the overall process.
Data Source
AI summary
An information processing device acquires a measured value of a response time for each of combinations of two target devices of at least three target devices that are communicatively connected to each other, with one of the two devices operating as a first communication device and the other one of the two devices operating as a second communication device. The measured value of the response time is a measured value of a time from start of transmission process of a first communication packet to reception of a second communication packet. The first communication packet is a packet sent from the first communication device to the second communication device. The second communication packet is a packet sent from the second communication device to the first communication device in response to reception of the first communication packet by the second communication device.