Dual-Frequency Adaptive Protocol for Wireless Sensor Network Interference
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Solution Overview
Problem
Wireless body area networks (WBANs) in hospitals face interference issues due to close proximity of devices, leading to data loss and latency, which are critical problems in patient health monitoring as they require timely and accurate transmission of vital signs.
Innovation Solution
A dual-frequency adaptive protocol (DFAP) is implemented, using time domain multiple access (TDMA) with frequency agility and redundancy to minimize packet loss and latency by transmitting data on multiple frequencies and adjusting frequencies based on packet loss thresholds, ensuring real-time data delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmission is used to increase transmission success rate, then reliability is improved, but data latency increases
Solution Approach 1:
The system dynamically adjusts transmission parameters including frequency selection and power levels based on real-time channel conditions. The gateway and sensor devices continuously monitor packet loss rates and adaptively modify transmission characteristics to maintain reliability without requiring retransmissions that would increase latency.
Solution Approach 2:
The patent employs dual-frequency transmission where the system can switch between two different frequencies based on which channel experiences less interference. By changing the transmission frequency parameter adaptively, the system achieves high transmission success rates while maintaining timely data delivery, avoiding the latency penalty of retransmissions.
2Loss of information
If TDMA protocol is used to avoid packet collisions, then data loss is reduced, but device complexity increases
Solution Approach 1:
The patent combines TDMA time scheduling with dual-frequency transmission mechanisms into a unified protocol. By merging these approaches, the system achieves robust collision avoidance and interference mitigation without requiring separate complex protocol layers, as the frequency dimension complements the time dimension efficiently.
Solution Approach 2:
The system adds a frequency dimension to the traditional TDMA time-domain approach. Instead of relying solely on time-division multiplexing, the patent utilizes frequency-division strategies where data can be transmitted on alternative frequencies when interference is detected, reducing packet loss while keeping protocol complexity manageable through structured frequency hopping patterns.
3Adaptability or versatility
If multiple WBANs operate in close proximity, then monitoring coverage is improved, but interference increases
Solution Approach 1:
The system implements local quality control by allowing each WBAN to independently select and adapt its transmission frequency based on local interference conditions. The gateway monitors the specific RF environment around each patient and adjusts transmission parameters locally, enabling multiple WBANs to operate in close proximity without mutual interference while maintaining comprehensive monitoring coverage.
Solution Approach 2:
The patent employs feedback mechanisms where gateways continuously monitor packet loss rates and interference levels from multiple WBANs. Based on this feedback, the system dynamically adjusts frequency selection and transmission parameters for each WBAN, enabling coordinated operation in dense hospital environments. The feedback loop allows the network to adapt to changing interference conditions and maintain reliable communication across multiple concurrent WBANs.
Data Source
AI summary
A system includes wireless sensor devices monitoring a patient, a gateway device providing dual-frequency adaptive protocol time synchronization signals to the sensor devices, the time synchronization signals including a communication frame structure having time slots including two beacon signal time slots and a plurality of data slots, where the sensor devices transmit respective patient data a first time interleaved within a first data slot and a second time interleaved within a second data slot, the first interleaved data transmission and the second interleaved data transmission are each transmitted at respective different frequencies provided to the sensor devices in beacon signals received from the gateway device. The first interleaved data transmission includes both current data and previous data from the at least two wireless sensor devices, and a frequency agility pattern separates adjacent channels by a respective predetermined frequency offset. A method and non-transitory medium are disclosed.