Backscatter Resource Allocation Across Subcarriers to Reduce Conflicts
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Solution Overview
Problem
In backscatter communication systems, multiple backscatter devices transmitting on the same frequency at the same moment lead to access failures and reduced success rates due to resource conflicts.
Innovation Solution
Implementing a method where backscatter devices determine a first resource based on a candidate resource, using offset steps and factors to stagger their transmissions, thereby reducing conflicts and improving access success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple backscatter devices transmit on the same frequency at the same moment, then the system can support multiple devices, but resource conflicts occur and access success rate decreases
Solution Approach 1:
The patent segments the frequency resource into multiple subcarriers and assigns different backscatter devices to different subcarriers for transmission. This segmentation allows multiple devices to transmit simultaneously without conflict, resolving the contradiction between supporting multiple devices and maintaining access success rate
Solution Approach 2:
The patent introduces a new dimension (frequency subcarrier dimension) for resource allocation. Instead of all devices competing on the same frequency, devices are differentiated by assigning them to different subcarrier indices, enabling simultaneous transmissions while avoiding conflicts
2Device complexity
If backscatter devices use the same resource for transmission, then device complexity is reduced, but conflicts increase and system recognition fails
Solution Approach 1:
The patent implements self-service by allowing each backscatter device to autonomously determine its transmission resource based on a predefined rule (using its device ID to calculate subcarrier index). This eliminates the need for complex centralized resource allocation while ensuring devices select different resources, avoiding conflicts without increasing device complexity
Solution Approach 2:
The patent changes the resource parameter from a single shared frequency to multiple distinguishable subcarriers. By modifying the frequency parameter into discrete subcarrier components, the system enables devices to transmit on different frequency points, reducing conflicts while maintaining simple device operation
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 proposed method effectively reduces the probability of resource conflicts, allowing multiple backscatter devices to transmit on distinct frequencies, enhancing the overall access success rate and system recognition.
Implementation Method 1
A principle of backscatter communication is as follows: An exciter sends an excitation signal to a receiver and a backscatter device. The backscatter device modulates, by using the excitation signal, data that needs to be sent to obtain a backscattered signal, and sends the backscattered signal to the receiver.
Data Source
AI summary
A backscatter communication method and apparatus provides operation including: receiving a first excitation signal from a first device; determining a first resource based on a candidate resource; and sending a backscattered signal of the first excitation signal to a second device based on the first resource. This can reduce a probability of selecting a same resource as another device to some extent, so that a conflict is reduced, and an access success rate of a backscatter device can be improved.