Wireless Sensor Back-Off Delay for Collision Avoidance
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Solution Overview
Problem
Wireless data transmitting devices with limited power supply, such as IoT sensors, face challenges with collision avoidance mechanisms like CSMA/CA, which lead to frequent battery drain and unreliable periodic data transmission, affecting real-time monitoring and control in applications like smart greenhouses.
Innovation Solution
A wireless data transmitting device that adjusts its transmission schedule based on specific periods and random back-off delay times, ensuring data is transmitted periodically without collisions, using a probability distribution model to avoid simultaneous data transmission among multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSMA/CA collision avoidance mechanism is implemented, then data transmission reliability is improved, but battery power consumption increases and periodic data transmission cannot be guaranteed
Solution Approach 1:
The patent implements periodic data transmission at predetermined intervals for battery-powered wireless devices. Each device transmits data periodically without continuous channel sensing and competition, significantly reducing power consumption while maintaining reliable data delivery through the periodic transmission schedule.
Solution Approach 2:
The patent performs preliminary channel sensing and collision avoidance before the actual periodic data transmission. By detecting channel occupancy in advance and resolving potential collisions beforehand, the system ensures that periodic transmissions proceed without repeated retries, thereby reducing overall power consumption while maintaining transmission reliability.
2Reliability
If frequent channel competitions are performed to avoid collisions, then data transmission reliability is improved, but battery power is drained quickly
Solution Approach 1:
Instead of frequent channel competitions, the patent establishes periodic transmission schedules where battery-powered devices transmit data at predetermined intervals. This eliminates the need for continuous channel sensing and competition, dramatically reducing energy loss while maintaining transmission reliability through the structured periodic approach.
Solution Approach 2:
The system allows battery-powered devices to autonomously transmit data periodically without continuous intervention from channel competition mechanisms. Each device independently follows its periodic transmission schedule, reducing the overall system's energy consumption while ensuring reliable data delivery.
3Productivity
If multiple wireless devices transmit data simultaneously, then data transmission speed is improved, but collisions occur and transmission halts
Solution Approach 1:
The patent segments the wireless network into different transmission groups or time slots, where devices are organized to transmit in a coordinated manner. This segmentation prevents simultaneous transmissions that cause collisions while maintaining efficient data flow, thereby preserving both transmission speed and continuity.
Solution Approach 2:
The system implements feedback mechanisms where devices monitor channel occupancy and transmission success. Based on this feedback, devices adjust their transmission timing to avoid collisions, ensuring continuous reliable transmission while maintaining high productivity through coordinated multi-device operation.
Data Source
AI summary
A wireless data transmitting system having a wireless data receiving device and a plurality of wireless data transmitting devices is disclosed. Each of the wireless data transmitting devices transmits data at every a specific period if no collision is detected during data transmission, and if a collision is detected during data transmission, the wireless data transmitting device decides a back-off delay time and transmits data after the back-off delay time has elapsed. The back-off delay time of the wireless data transmitting device is a multiplication of a unit slot time of the wireless data transmitting device transmitting at least one data packet, by k, wherein k is an integer equal to or larger than 1 and is randomly decided by a probability distribution model of the wireless data transmitting device.