Wireless Body Area Network Topology for Medical Devices
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Solution Overview
Problem
Existing wireless body area networks (WBANs) and wireless personal area networks (WPANs) face challenges such as body shadowing, interference, and power consumption issues, particularly in medical contexts like continuous glucose monitoring and insulin therapy, where RF connection reliability is critical but often compromised, leading to false alarms and link degradation.
Innovation Solution
A wireless network topology featuring a first wireless network device with both far-field and near-field transceivers, which dynamically switches between Leader and Follower roles based on power, battery level, and signal quality to maintain robust communication with off-body devices, ensuring only one active far-field link at a time and utilizing near-field communication between on-body devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple on-body devices use far-field RF coupling to communicate with off-body devices simultaneously, then communication coverage and connectivity are improved, but interference and body shadowing effects increase leading to connection failures
Solution Approach 1:
The patent segments the communication system into two distinct modes: near-field coupling for on-body device-to-device communication and far-field coupling for on-body device-to-off-body communication. This segmentation allows each mode to operate independently with its own transceivers, preventing interference between simultaneous communications and eliminating body shadowing issues that affect far-field signals.
Solution Approach 2:
The patent introduces an intermediary communication path using near-field transceivers for devices on the same body. Instead of all devices attempting direct far-field communication with off-body devices, nearby on-body devices use near-field coupling as an intermediary to exchange data, which then routes through the far-field transceiver for off-body communication. This mediator approach reduces interference and improves reliability.
2Reliability
If all on-body devices maintain active far-field links to off-body devices, then communication robustness is improved, but power consumption increases
Solution Approach 1:
The patent applies partial action by having only one far-field transceiver active at a time for off-body communication, while multiple near-field transceivers remain in a lower-power state. Instead of all devices maintaining full far-field links, the system uses near-field coupling for local device communication, reducing overall power consumption while maintaining robustness through the Leader-Follower mechanism.
Solution Approach 2:
The patent changes the operational parameters of different transceivers based on communication needs. Far-field transceivers operate at high power only when needed for off-body communication, while near-field transceivers operate at lower power for on-body device communication. This parameter change allows the system to maintain communication robustness while significantly reducing average power consumption.
3Use of energy by moving object
If a single far-field link is maintained between on-body and off-body devices, then power consumption is reduced, but body shadowing and interference cause link degradation and false alarms
Solution Approach 1:
The patent implements dynamic role assignment where on-body devices can switch between Leader and Follower statuses based on real-time communication conditions. The Leader maintains the active far-field link to off-body devices, while Followers use near-field coupling to communicate with the Leader. This dynamic configuration allows the system to adapt to body shadowing and interference conditions, maintaining link reliability without requiring all devices to maintain active far-field links.
Solution Approach 2:
The patent uses near-field coupling as an intermediary communication path between Followers and the Leader. Instead of Followers attempting direct far-field communication with off-body devices (which causes interference and body shadowing issues), they route communications through the Leader via near-field coupling. This intermediary approach eliminates false alarms and improves link reliability while keeping power consumption low.
4Adaptability or versatility
If multiple far-field transceivers operate simultaneously on on-body devices, then communication versatility is improved, but interference between devices increases
Solution Approach 1:
The patent segments the transceiver operations into distinct near-field and far-field modes with dedicated transceivers for each. On-body devices have both near-field transceivers for local communication and far-field transceivers for off-body communication, but these operate independently. This segmentation prevents interference between simultaneous communications while maintaining full communication versatility.
Solution Approach 2:
The patent applies local quality by using near-field transceivers specifically for communications between devices on the same body, while far-field transceivers handle off-body communications. This spatial and functional differentiation ensures that local device communications do not interfere with off-body communications, allowing multiple transceivers to operate simultaneously without generating harmful interference.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances robustness and reliability by minimizing interference, conserving power, and maintaining communication integrity even when body shadowing occurs, reducing false alarms and improving link quality in medical applications.
Implementation Method 1
the near-field coupling uses quasi-static electric signals
Implementation Method 2
the far-field coupling uses plane wave RF signals
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
One example discloses a first wireless network device, including: a far-field transceiver; a near-field transceiver; wherein the first wireless network device is configured to be wirelessly near-field coupled to a second wireless network device that also includes a far-field transceiver and a near-field transceiver; wherein the first wireless network device is further configured to be wirelessly near-field coupled to a set of near-field wireless network devices using only the near-field transceiver; wherein first wireless network device, the second wireless network device, and the set of near-field wireless network devices are configured to be in physical contact with a body; and wherein the first wireless network device is configured to be wirelessly far-field coupled to a third wireless network device only if the second wireless network device is not wirelessly far-field coupled to the third wireless network device.