Parallel Multi-Frequency Signal Transmission in Wireless Sensor Networks
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Solution Overview
Problem
The WirelessHART protocol for industrial communication networks requires significant time slots for retransmissions due to packet errors, leading to increased latency and reduced bandwidth in wireless sensor actuator networks (WSANs).
Innovation Solution
Implementing a method where signals are transmitted and received at different frequencies within a time slot, introducing frequency diversity to reduce retransmissions and packet loss, and using a software stack with an application layer, networking layer, media access layer, and physical layer to manage parallel transmission and reception, with frequency allocation based on packet-to-packet interference factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time slots are reserved for retransmission in WirelessHART protocol, then reliability of packet delivery is improved, but latency increases and bandwidth is reduced
Solution Approach 1:
The patent applies preliminary action by transmitting packets across multiple frequency channels before transmission begins. By pre-establishing multiple transmission paths at different frequencies, the system proactively prepares for potential transmission failures, eliminating the need for reactive retransmission and thereby reducing latency while maintaining reliability.
Solution Approach 2:
The patent changes the frequency parameter by transmitting the same packet across multiple frequency channels simultaneously. This parameter diversification allows the system to overcome frequency-specific interference and fading, improving packet delivery reliability without requiring additional time slots for retransmission.
2Reliability
If time slots are reserved for retransmission in WirelessHART protocol, then reliability of packet delivery is improved, but bandwidth is reduced
Solution Approach 1:
The system pre-establishes multiple frequency transmission paths before data transmission begins. This preliminary preparation enables immediate retransmission capability without dedicating additional time slots, thereby maintaining network bandwidth while improving packet delivery reliability through frequency diversity.
Solution Approach 2:
The patent introduces frequency diversity by transmitting packets across multiple frequency channels simultaneously. This dimensional expansion from single-frequency to multi-frequency transmission increases the available transmission pathways, improving reliability without consuming additional time resources and thus preserving network bandwidth.
3Loss of time
If signals are transmitted at different frequencies in parallel, then retransmission need is reduced and latency decreases, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by designing transmission devices that can simultaneously operate across multiple frequency channels. This universal capability allows a single device to perform both initial transmission and potential retransmission functions across different frequencies, reducing latency while managing complexity through consolidated multi-functional hardware.
Solution Approach 2:
The patent merges multiple transmission functions into a unified multi-frequency transmission system. By combining initial transmission and retransmission capabilities into a single parallel multi-frequency operation, the system reduces latency and eliminates the need for separate retransmission mechanisms, thereby managing device complexity through integration.
Data Source
AI summary
In a wireless sensor actuator network, a time slot for transmission of a signal to a first device and a second device of the wireless sensor actuator network may be determined. During the time slot, the signal may be transmitted via a first frequency channel and first antenna to the first device and via a second frequency channel and second antenna to the second device in parallel. The first frequency channel may be different from the second frequency channel. Further, the first frequency channel and the second frequency channel may be selected based on a power level to transmit the signal to the first device, a power level to transmit the signal to the second device, an angle to transmit the signal to the first device, and an angle to transmit the signal to the second device.