Communication Controller Scheduling for Periodic Signal Timing
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Solution Overview
Problem
In communication controllers, nonperiodic signals and retransmissions can disrupt the synchronized transmission timing of control commands, leading to performance deterioration in control systems, as they are not effectively integrated with periodic signal transmission, causing delays and inaccuracies in synchronization accuracy.
Innovation Solution
A communication controller is designed with separate units for periodic and nonperiodic signal transmission, where the schedule unit manages transmission requests based on processing times and remaining periods to ensure periodic signals are transmitted accurately without interference from nonperiodic signals, and includes a retransmission function for periodic data to improve data transmissibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nonperiodic signals are transmitted in the network, then data transmissibility is improved, but transmission timing accuracy of periodic control commands deteriorates
Solution Approach 1:
The patent segments the transmission medium into two distinct types: periodic transmission slots for control commands and nonperiodic transmission slots for other data. This segmentation allows periodic signals to maintain accurate transmission timing while nonperiodic signals can be transmitted flexibly, resolving the contradiction between data transmissibility and timing accuracy.
Solution Approach 2:
The patent introduces a time slot management mechanism as an intermediary that coordinates between periodic and nonperiodic transmission requests. This mediator allocates transmission opportunities, ensures periodic signals receive dedicated time slots for timing accuracy, while allowing nonperiodic signals to be transmitted in available slots, thus improving data transmissibility without compromising timing precision.
2Reliability
If retransmission is performed for periodic signals, then data transmissibility is improved, but transmission timing accuracy deteriorates
Solution Approach 1:
The patent separates retransmission operations into dedicated nonperiodic time slots, distinct from the original periodic transmission slots. This ensures that retransmission activities do not interfere with the timing accuracy of periodic control commands, while still improving data transmissibility through reliable retransmission mechanisms.
Solution Approach 2:
The patent performs preliminary allocation of time slots for potential retransmissions, ensuring that if retransmission is needed, it occurs in pre-designated slots that will not conflict with periodic signal timing requirements. This preliminary planning maintains timing accuracy while enabling improved data transmissibility.
3Reliability
If dedicated time slots are allocated for nonperiodic signals, then data transmissibility is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal time slot management mechanism that handles both periodic and nonperiodic transmission requests through a single integrated scheduling system. This multi-functional approach improves data transmissibility for nonperiodic signals while avoiding the need for separate dedicated infrastructure, thereby limiting the increase in device complexity.
Data Source
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AI summary
In a communication controller and control devices that are connected to each other via a network, the transmission timing of a control command is delayed depending on the transmission timing of a noncontrol command such as a request of obtaining management information and working information transmitted to the control devices, or depending on the transmission timing of retransmission of the control command. The present invention provides a communication controller 120 that communicates with one or more control devices 121 via a network 122, the communication controller 120 including: a nonperiodic transmission unit 114 that generates a transmission request at any time; a periodic transmission unit 115 that generates a transmission request in a constant period; a communication unit 112 that communicates transmission data of each of the nonperiodic transmission unit 114 and the periodic transmission unit 115 with the network 122; and a schedule unit 117 that: transmits transmission content of the periodic transmission unit 115 to the communication unit 112; computes a communication processing period of time required for a communication process of the nonperiodic transmission unit 114 having issued the transmission request; obtains a remaining period of time of the constant period of the periodic transmission unit 115; compares the communication processing period of time with the remaining period of time of the constant period; and transmits transmission content of the nonperiodic transmission unit 114 to the communication unit 112.