Slave Terminal ACK-Based Timing Adjustment for Interference Control
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Solution Overview
Problem
Conventional slave terminals experience cumbersome settings and increased power consumption due to interference and repeated wireless transmissions when multiple terminals are used with a single master terminal.
Innovation Solution
A slave terminal with a data transmission unit that transmits status data at fixed periods, includes a reply check unit to determine ACK signals, an adjustment value calculation unit to set a random adjustment period when no ACK is received, and a timing update unit to adjust transmission timings accordingly, thereby avoiding interference and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple slave terminals transmit status data at fixed periodic intervals to a single master terminal, then data collection completeness is improved, but transmission interference increases and power consumption increases due to repeated transmissions
Solution Approach 1:
The system uses periodic transmission triggers at fixed intervals, but modifies the actual transmission timing by adding random adjustments to the periodic schedule. This maintains the periodic nature of data collection while introducing variability to avoid synchronized transmissions from multiple terminals.
Solution Approach 2:
The transmission timing is made dynamic by introducing random adjustment values that are added to the fixed periodic intervals. Each terminal dynamically adjusts its transmission schedule based on these random values, transforming a static periodic system into a dynamic one that adapts to avoid interference.
2Reliability
If multiple slave terminals transmit status data at fixed periodic intervals to a single master terminal, then data collection completeness is improved, but power consumption increases due to repeated transmissions
Solution Approach 1:
The system maintains periodic transmission triggers at fixed intervals to ensure data collection completeness, but uses random timing adjustments to avoid unnecessary retransmissions, thereby reducing overall power consumption.
Solution Approach 2:
The system uses ACK signal feedback from the master terminal to determine whether retransmission is necessary. When an ACK is received, the terminal knows its data was successfully received and can skip subsequent transmissions, reducing power consumption while maintaining data completeness.
3Device complexity
If slave terminals use fixed periodic transmission timing, then transmission simplicity is maintained, but interference avoidance becomes cumbersome requiring complex settings
Solution Approach 1:
The system pre-calculates and stores random adjustment values in advance. This preliminary action allows the terminals to automatically apply timing adjustments without requiring complex real-time calculations or manual configuration, maintaining simplicity while achieving interference avoidance.
Solution Approach 2:
Each slave terminal independently manages its own transmission timing by automatically applying its stored random adjustment values to the periodic triggers. This self-service approach eliminates the need for complex centralized coordination or manual settings, simplifying the overall system operation.
Data Source
AI summary
A slave terminal includes: a data transmission unit that wirelessly transmits status data relating to a condition of a monitoring target to a monitoring apparatus in response to a transmission trigger at every fixed period; a reply check unit that determines whether or not an ACK signal was sent back from the monitoring apparatus in response to the status data that was transmitted; an adjustment value calculation unit that determines an adjustment period of a random length when there was no reply; a timing update unit that outputs a measurement start trigger after the adjustment period has elapsed when there was no reply, the timing update unit outputting the measurement start trigger without the adjustment period when there was a reply; and a trigger generation unit that outputs the transmission trigger after counting the fixed period in response to the measurement start trigger.