Ambient Power Device Transmission Coordination via Frequency and Time Offsets
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Solution Overview
Problem
Ambient power devices in wireless communication networks face challenges in managing simultaneous uplink transmissions, leading to collisions and data loss due to overlapping frames.
Innovation Solution
A transmission coordination logic is implemented to determine carrier frequencies and time slots, generate control frames, and coordinate the transmission of uplink frames from multiple ambient power devices, minimizing collisions through frequency and time domain management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple ambient power devices transmit uplink frames simultaneously, then transmission efficiency is improved, but collisions and data loss occur due to overlapping frames
Solution Approach 1:
The patent segments the transmission medium by introducing frequency offsets that differentiate uplink frames from different ambient power devices. Each device transmits on a slightly offset frequency, allowing simultaneous transmissions to be separated and decoded independently, thus maintaining both high productivity and data integrity
Solution Approach 2:
The patent adds a frequency dimension to the time-domain based backscatter communication. By applying frequency offsets to uplink frames, the system transforms a one-dimensional (time) transmission problem into a two-dimensional (time-frequency) solution, enabling simultaneous transmissions to be distinguished through frequency differentiation
2Ease of operation
If ambient power devices perform complex signal processing, then transmission coordination is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent introduces frequency offset as an intermediary mechanism that simplifies the coordination problem. Instead of requiring complex distributed coordination algorithms, the system uses frequency offsets as a simple mediator that automatically separates simultaneous transmissions, reducing device complexity while maintaining ease of operation
Solution Approach 2:
The patent changes the frequency parameter of uplink frames by applying offsets based on device identifiers or time slots. This parameter change enables automatic transmission separation without requiring ambient power devices to perform complex signal processing, maintaining simplicity while improving coordination
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
The solution effectively reduces collisions and optimizes resource utilization in wireless communication networks, ensuring reliable communication and efficient data transmission from ambient power devices.
Implementation Method 1
Many ambient power devices transmit uplink frames by backscattering. In that, an ambient power device may receive a trigger frame from an Access Point (AP). The ambient power device can backscatter the trigger frame or a preamble of the trigger frame.
Data Source
AI summary
Devices, networks, systems, methods, and processes for coordinating transmissions from a plurality of ambient power devices are described herein. An Access Point (AP) may transmit one or more control frames to the plurality of ambient power devices. The one or more control frames may include a sequence of bits that may be utilized by the plurality of ambient power devices to determine a frequency offset. The one or more control frames can also include a transmission order indicative of an order of transmission of each ambient power device of the plurality of ambient power devices. The one or more control frames can include one or more matrices indicative of one or more carrier frequencies and time slots. The plurality of ambient power devices can receive the one or more control frames and transmit one or more uplink frames to the AP based on the one or more control frames.