Remote Control Delay Detection Using Round-Trip Time Stamps
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Solution Overview
Problem
Existing delay detection systems, such as Patent Literature 1, fail to accurately monitor delays in a remote control system as a whole, primarily focusing on transfer delays in remote operation signals and neglecting other types of delays like imaging, transfer, display, response, and execution delays.
Innovation Solution
A delay detection method and device that involve adding time information to mobile body information and operation signals, allowing for accurate detection of round-trip delays by comparing first and second time information, and executing safety measures like minimal risk maneuvers when delays exceed thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If delay detection is performed only on remote operation signals between vehicle communicator and remote communicator, then communication delay between these components can be monitored, but delay in the entire remote control system including imaging, transfer, display, response, and execution delays cannot be comprehensively monitored
Solution Approach 1:
The patent segments the remote control system into multiple delay components: imaging delay (obtaining mobile body information), transfer delay (transmitting information), display delay (displaying information), response delay (operator response time), and execution delay (mobile body execution time). By detecting each segment separately and summing them, the system achieves comprehensive delay monitoring while maintaining measurement precision for each individual component.
Solution Approach 2:
The patent introduces time information as an intermediary element that is attached to mobile body information and transmitted through the entire system. This time stamp serves as a mediator to track and measure delays across all system components, enabling comprehensive monitoring without disrupting the normal operation of each subsystem.
2Reliability
If multiple types of delays (imaging, transfer, display, response, execution) are comprehensively monitored, then system-wide delay awareness is achieved, but system complexity increases
Solution Approach 1:
The patent creates a universal delay detection framework where the mobile body performs multiple functions: it captures images, transmits information, receives and executes commands, and simultaneously monitors all these operations for delay. The same system components used for normal operation are leveraged for delay detection, avoiding the need for separate dedicated monitoring hardware and reducing overall system complexity.
Solution Approach 2:
The mobile body autonomously performs delay detection by attaching time information to its own transmissions and calculating delays based on received time stamps. The system monitors itself without requiring external monitoring equipment, thereby improving reliability while minimizing additional system complexity.
3Measurement precision
If time information is attached to mobile body information and operation signals for delay calculation, then accurate round-trip delay detection is achieved, but data transmission volume increases
Solution Approach 1:
The patent attaches time information locally at specific critical points in the communication flow: when the mobile body transmits information and when the terminal sends operation signals. Rather than continuously transmitting time data, the system adds time stamps only where needed for delay calculation, maintaining measurement precision while minimizing additional data volume.
Data Source
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AI summary
A delay detection method, which is a delay detection method to be executed by a mobile body that is remotely controllable by an operator, includes: adding first time information to mobile body information indicating a state of the mobile body (10), and transmitting, to a terminal (30) of the operator, the mobile body information to which the first time information has been attached (S2); receiving an operation signal that includes details of remote control performed by the operator in response to the mobile body information, the operation signal including second time information that is based on the first time information included in the mobile body information (S6); and detecting a delay in a remote control system including the mobile body (10) and the terminal (30), based on the second time information and a predetermined time (S7).