Wireless Sensor Network Reliability via Pseudo-Random Channel Switching
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Solution Overview
Problem
Modern vehicles and industrial control systems face challenges with wired networks due to increased production and maintenance costs, weight considerations, and the need for frequent upgrades, while wireless networks are prone to interference and unreliable due to environmental factors, requiring improved reliability and resilience in wireless communication systems.
Innovation Solution
A wireless communication system utilizing multi-path routing, multiple channels, and redundant data transmission to achieve low bit error and packet error rates, incorporating techniques like route diversity, link diversity, and time diversity, along with dynamic channel selection and pseudo-random channel switching, to enhance reliability and resilience against interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wired networks are used for control systems, then reliability and protection of communication are improved, but production costs, maintenance costs, and system weight increase
Solution Approach 1:
The patent replaces wired mechanical connections with wireless communication systems. The wireless network infrastructure substitutes physical cable networks, eliminating the need for extensive wiring infrastructure while maintaining communication functionality. This substitution reduces production costs by eliminating cable installation and reduces system weight by removing physical wire connections.
Solution Approach 2:
The patent employs multiple wireless channels and frequency diversity to change the communication parameters dynamically. By utilizing multiple frequency channels and time slots, the system achieves reliable communication without requiring redundant physical wired connections, thereby reducing manufacturing complexity and cost while maintaining high reliability.
2Reliability
If wired networks are used for control systems, then communication protection is improved, but maintenance costs and system complexity increase
Solution Approach 1:
The wireless communication system replaces physical wired networks, eliminating the need for physical cable maintenance, connection checks, and repair operations. Wireless nodes can be reconfigured and upgraded without physical intervention, significantly reducing maintenance costs and improving ease of repair.
Solution Approach 2:
The patent implements dynamic channel selection and frequency hopping where the communication parameters change adaptively based on environmental conditions. This dynamic behavior allows the system to automatically avoid interference and maintain reliable communication without requiring manual intervention or physical reconfiguration, reducing maintenance requirements.
3Ease of manufacture
If wireless networks are used for control systems, then production costs and system weight are reduced, but communication reliability deteriorates due to interference and environmental factors
Solution Approach 1:
The patent divides the communication channel into multiple frequency channels and time slots. By segmenting the spectrum resource and allocating different channels to different transmissions, the system achieves reliable communication without requiring redundant wired connections, thus maintaining cost efficiency while improving reliability.
Solution Approach 2:
The patent implements feedback mechanisms where nodes assess channel quality and dynamically adjust their transmission parameters. Based on feedback about interference and channel conditions, the system selects optimal channels and adjusts power levels, ensuring reliable communication while maintaining the cost benefits of wireless implementation.
4Ease of operation
If wireless networks are used in indoor environments, then installation flexibility is improved, but communication quality deteriorates due to multi-path fading and obstacles
Solution Approach 1:
The patent segments the wireless communication into multiple paths and channels, allowing the system to exploit spatial diversity in indoor environments. By transmitting the same information over multiple spatial paths and frequency channels, the system overcomes multi-path fading and obstacles while maintaining installation flexibility.
Solution Approach 2:
The patent implements dynamic channel selection and frequency hopping that adapts to the indoor environment. The system dynamically adjusts transmission parameters based on real-time channel assessment, allowing flexible installation while maintaining communication quality despite obstacles and fading effects.
Data Source
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AI summary
A wireless communication system comprises one or more control units operable to transmit control signals, a plurality of actuators responsive to the control signals, and a plurality of sensors operable to transmit sensor data used by the one or more control units in generating the control signals. Each of the sensors, actuators, and one or more control units are located at a fixed position in the system relative to one another. Each of the plurality of sensors and each of the plurality of actuators are coupled to at least one of the one or more control units via a plurality of wireless paths. Each of the plurality of sensors are operable to transmit the sensor data in an assigned time slot to at least one of the one or more control units over a plurality of wireless channels in each of the plurality of wireless paths. The number of channels in each of the plurality of wireless paths is determined based, at least in part, on a worst-case estimate of potential interference, and each of the plurality of sensors is operable to pseudo-randomly switch the plurality of channels over which the sensor data is transmitted.