Ambient IoT Carrier Wave Multiplexing for Backscatter and Self-Powered Tags
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Solution Overview
Problem
Existing wireless communication systems face challenges in harmonizing air interface designs for ambient IoT devices with varying power consumption and transmission capabilities, particularly in managing backscattering and self-powered transmissions, while addressing interference and synchronization issues.
Innovation Solution
The implementation of a harmonized air interface design that includes separate resource pools for different categories of ambient IoT tags, utilizing backscattering for lower power devices and self-powered transmissions, along with multiplexing techniques such as FDM and CDM for carrier waves, and interference mitigation methods like channel estimation through preamble designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate resource pools are implemented for different IoT device categories, then device-specific optimization is improved, but system complexity increases
Solution Approach 1:
The patent divides the resource pool into separate categories: one resource pool for first category IoT devices (backscattering devices) and another resource pool for second category IoT devices (self-powered devices). This segmentation allows each device type to access resources optimized for its specific transmission characteristics, resolving the contradiction by improving device-specific optimization while managing system complexity through structured organization.
2Use of energy by moving object
If backscattering is used for lower power devices, then power consumption is reduced, but transmission capability is limited
Solution Approach 1:
The patent applies different transmission mechanisms to different device categories based on their local characteristics: first category devices use backscattering for ultra-low power consumption, while second category devices use self-powered transmissions for higher transmission capability. This local quality approach resolves the contradiction by allowing each device type to operate at its optimal power-transmission balance point.
3Productivity
If multiplexing techniques are applied to carrier waves, then resource utilization is improved, but interference management becomes more difficult
Solution Approach 1:
The patent segments the resource pools in the time-frequency domain, allocating specific resources to each device category. This segmentation reduces interference between backscattering and self-powered devices by preventing their simultaneous access to the same resources, while still achieving improved resource utilization through structured sharing of the overall spectrum.
4Productivity
If simultaneous multi-access is enabled for diverse device categories, then system capacity is improved, but synchronization becomes more challenging
Solution Approach 1:
The patent implements preliminary synchronization mechanisms where the base station provides synchronization signals and resource allocation information to both device categories before their actual transmissions. This preliminary action enables simultaneous multi-access of diverse device types while managing synchronization complexity through advance coordination and structured resource assignment.
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
Enables efficient and cost-effective communication for ambient IoT devices by optimizing power consumption and reducing interference, facilitating simultaneous multi-access and synchronization across diverse device categories.
Implementation Method 1
receiving, in a first resource of the first ambient internet of things resource set, a first backscattering derived from a carrier wave by the first ambient internet of things tag
Data Source
AI summary
Systems and methods for carrier wave design using ambient internet of things (IoT) resource sets and multiplexing of different ambient IoT devices are discussed herein. A base station sends, to a first ambient IoT tag, a trigger message identifying a first ambient IoT resource set; receives, in a first resource of the first ambient IoT resource set, a first backscattering derived from a carrier wave by the first ambient IoT tag; and decodes, from the first backscattering, first data of the first ambient IoT tag. An ambient IoT tag receives, from a base station, a trigger message identifying an ambient IoT resource set; receives a carrier wave in the ambient IoT resource set; and generates a backscattering using the carrier wave in a resource of the ambient IoT resource set.