Passive Tag Channel Estimation with Assisting Nodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently activating and communicating with passive or semi-passive IoT devices due to energy harvesting limitations, especially when network nodes are far, blocked, or signals are reflected, leading to weak responses from tags.
Innovation Solution
Utilizing assisting nodes, such as UEs or IAB nodes, to enhance signal strength and energy harvesting at passive tags by backscattering channel estimation signals, enabling coherent joint transmission with network nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a network node transmits a channel estimation signal directly to a passive tag, then the tag can harvest energy and respond, but the signal strength is weak when the network node is far, blocked, or signals are reflected
Solution Approach 1:
The patent introduces assisting nodes as intermediaries between the network node and the passive tag. These assisting nodes transmit channel estimation signals that are backscattered by the tag, providing multiple signal paths and improving signal strength when direct transmission is weak due to distance, blockage, or reflection.
2Power
If multiple assisting nodes are used to transmit channel estimation signals, then energy harvesting and response signal strength are enhanced, but the system complexity increases
Solution Approach 1:
The patent enables regular wireless communication nodes to function as assisting nodes for passive tag communication. The same nodes that perform standard communication tasks can also transmit channel estimation signals for passive tags, eliminating the need for dedicated specialized hardware and reducing overall system complexity.
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
Improves communication with passive tags by constructingively combining signals, enhancing energy harvesting and response signal strength, thus improving communication efficiency.
Implementation Method 1
transmit the channel estimation signal to be backscattered by a tag
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may transmit, to a plurality of additional nodes, an indication of a channel estimation signal. The network node may transmit the channel estimation signal to be backscattered by a tag. Numerous other aspects are described.