Remote Wireless Transmission Timing to Avoid Hopping Collisions
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Solution Overview
Problem
In existing industrial wireless communication systems, multiple remote wireless devices perform frequency hopping in the same pattern and period, leading to signal collisions that result in prolonged transmission times and decreased communication speed and processing capacity.
Innovation Solution
The remote wireless device employs a transmission/reception processing unit that performs multiple transmission attempts with a counting mechanism to determine if a predetermined number of retries is reached, then selects between retrying or standing by based on a rule, and includes a prohibition unit to halt transmission if necessary, along with a slot selection unit to adjust transmission timings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple remote wireless devices perform frequency hopping in the same pattern and period, then radio wave interference between devices is prevented, but signal collision occurs frequently leading to decreased communication speed
Solution Approach 1:
Each remote wireless device is assigned a unique identification number that determines its specific frequency hopping pattern. This local differentiation ensures that while all devices follow the same overall hopping structure, their actual hopping sequences are distinct, preventing both interference and collision
Solution Approach 2:
The system dynamically adjusts transmission behavior based on collision detection. When a device detects a collision, it modifies its retransmission strategy by varying the frequency hop pattern or adjusting timing, allowing the system to adapt to changing network conditions and reduce recurring collisions
2Reliability
If each remote wireless device continuously retransmits signals at the same frequency and period, then transmission reliability is improved, but signal collision occurs repeatedly taking a long time to complete transmission
Solution Approach 1:
The system changes the frequency parameter dynamically during retransmission. Instead of repeating the same frequency pattern, each retransmission attempt uses a modified frequency hop pattern determined by the device's identification number and transmission count, reducing the likelihood of repeated collisions while maintaining transmission reliability
Solution Approach 2:
The system incorporates feedback mechanisms where devices detect transmission status and adjust their behavior accordingly. When collisions are detected, the feedback loop triggers modified retransmission strategies that vary frequency patterns, allowing the system to learn from previous failures and avoid repeating them
3Device complexity
If remote wireless devices use the same frequency hopping pattern, then frequency allocation is simplified, but network congestion increases and processing capacity decreases
Solution Approach 1:
The frequency spectrum is segmented into multiple hopping patterns, with each pattern assigned to specific devices based on their identification numbers. This segmentation allows simplified frequency allocation management while distributing devices across different patterns to reduce congestion and maintain processing capacity
Data Source
AI summary
A remote wireless device transmits and receives signals to and from a base wireless device in a transmission/reception period, and includes a transmission/reception processing unit that performs a transmission process of a signal in each of a plurality of continuous transmission/reception periods until transmission to the base wireless device is made successfully. A counting unit counts a number of times the transmission processes is performed. A transmission selection unit selects whether to perform the transmission process or stand by in a next transmission/reception period in accordance with a predetermined rule in a case that a count value by the counting unit is equal to or greater than a predetermined number. A transmission prohibition unit prohibits the transmission process by the transmission/reception processing unit in a case that standby is selected by the transmission selection unit.