RFID Reader Interference Avoidance via Distributed Coordination
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Solution Overview
Problem
RF devices, particularly RFID systems, experience interference when operating in proximity to each other, leading to operational failures, and existing solutions like reader orchestration introduce complexity and a single point of failure by relying on a central coordinating device.
Innovation Solution
Implementing a method within each RF device to coordinate reader transmissions by receiving and sending requests to determine if another reader is transmitting, thereby avoiding interference without the need for a central coordinating device, using a processing circuit, memory, and antenna to manage these interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reader orchestration is used to coordinate RF devices, then interference between devices is avoided, but system complexity increases and a single point of failure is introduced
Solution Approach 1:
The patent divides the central coordination function into distributed segments, where each reader independently performs coordination tasks with its neighboring readers. Instead of one central device managing all readers, each reader autonomously manages coordination with specific others, segmenting the coordination workload and eliminating the single point of failure while maintaining interference avoidance.
Solution Approach 2:
Each reader is equipped with the capability to autonomously determine whether to transmit by checking its own transmission status and making decisions without external coordination. The reader serves itself by independently managing its transmission requests and denials, eliminating the need for a central coordinating device while preventing interference through self-regulation.
2Reliability
If reader orchestration is implemented, then RF device interference is prevented, but additional API calls and operational requirements are introduced
Solution Approach 1:
The patent merges the coordination function directly into the existing reader operations and API structure. Instead of adding a separate coordination layer that requires additional API calls, the coordination logic is integrated into the readers' native transmission control mechanisms, allowing interference prevention without increasing operational complexity or requiring new API interfaces.
3Productivity
If multiple readers operate simultaneously, then system productivity increases, but interference between readers occurs
Solution Approach 1:
Before a reader transmits, it performs a preliminary check by sending a request to neighboring readers to determine if they are currently transmitting. This preliminary action allows the reader to anticipate potential interference and adjust its transmission timing accordingly, enabling multiple readers to operate simultaneously without actual interference by coordinating their transmissions in advance.
Solution Approach 2:
The patent implements a feedback mechanism where readers send transmission requests to neighboring readers and receive responses indicating whether those readers are currently transmitting. This feedback loop allows each reader to make informed transmission decisions, adjusting its operation based on the real-time status of other readers, thereby enabling high productivity while preventing interference through continuous mutual awareness.
Data Source
AI summary
A method for coordinating reader transmissions, according to one embodiment, includes: at a first reader, receiving from a second reader a request to transmit to a RFID tag; determining whether the first reader is transmitting; and sending a denial of the request from the first reader to the second reader in response to determining that the first reader is transmitting. A method, according to another embodiment, includes: from a first reader, sending to a plurality of readers a request to transmit to a RFID tag; waiting for responses from the plurality of readers; not transmitting to the RFID tag in response to the first reader receiving a denial of the request from any of the readers; and transmitting to the RFID tag in response to the first reader not receiving a denial of the request from any of the readers. Additional systems, methods and computer program products are presented.