RF Band Segmentation for Ambient Power Wireless Tracking
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Solution Overview
Problem
Ambient power (AMP) devices used for tracking in wireless local area networks (WLANs) face reliability issues due to operating on low and unpredictable power, making it difficult to communicate over large distances or transmit significant data effectively.
Innovation Solution
Configuring anchor wireless devices and AMP devices to operate on different RF bands for downlink and uplink transmissions, minimizing power consumption by using various energizing methods and RF band configurations that separate UL and DL transmissions, and employing intermediary network nodes to facilitate data packet delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If AMP devices operate on harvested environmental power, then cost is reduced, but reliability deteriorates due to low and unpredictable power availability
Solution Approach 1:
The system segments power consumption by separating downlink and uplink transmissions onto different RF bands. AMP devices only need to harvest enough power for uplink transmissions on the second RF band, while downlink communications on the first RF band consume no power from the AMP device. This segmentation makes power requirements predictable and manageable within harvested power limits.
Solution Approach 2:
The system dynamically adjusts communication strategies based on available harvested power. Anchor wireless devices adapt their transmission patterns, and AMP devices adjust their uplink transmission timing and power based on real-time power availability from environmental harvesting, enabling reliable operation despite unpredictable power sources.
2Productivity
If AMP devices transmit data over large distances, then tracking capability is improved, but power consumption increases beyond harvested power availability
Solution Approach 1:
Anchor wireless devices serve as intermediaries that perform most of the communication work. They transmit downlink signals over large distances to AMP devices and receive uplink responses, eliminating the need for AMP devices to transmit high-power signals over long distances. The anchor devices handle the energy-intensive portions of communication while AMP devices only perform low-power responses.
Solution Approach 2:
The system uses periodic downlink transmissions from anchor devices to energize and synchronize AMP devices. AMP devices listen for these periodic signals and transmit uplink data at scheduled intervals when powered, enabling long-distance tracking capability through coordinated periodic communication rather than continuous high-power transmission.
3Device complexity
If downlink and uplink transmissions use the same RF band, then device complexity is reduced, but RF band conflicts increase and power efficiency decreases
Solution Approach 1:
The RF spectrum is segmented into at least two separate bands: a first RF band for downlink transmissions and a second RF band for uplink transmissions. This frequency segmentation eliminates RF band conflicts between simultaneous downlink and uplink operations, allowing AMP devices to harvest power from the first RF band while transmitting on the second RF band without interference.
Solution Approach 2:
The system resolves RF band conflicts by adding a frequency dimension to the communication architecture. Instead of time-division multiplexing on a single frequency, the patent uses frequency-division separation, creating orthogonal communication channels that eliminate mutual interference and improve overall system efficiency.
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 approach minimizes power consumption, reduces RF band and frequency conflicts, and enhances the reliability of AMP devices in WLAN tracking systems by allowing efficient communication and data transmission while maintaining cost-effectiveness.
Implementation Method 1
a client wireless device to harvest energy from an environment of the client wireless device
Data Source
AI summary
A method includes transmitting, by an anchor wireless device over a first radio frequency (RF) band, a first wireless signal to a client wireless device. The client wireless device is an ambient power (AMP) device that harvests environmental energy. The first wireless signal includes a data packet requesting information from the client wireless device. The method further includes receiving, by the anchor wireless device over a second RF band, a second wireless signal from the client wireless device. The second wireless signal includes a data packet responding with the requested information.