Dual-Band RFID Interrogation for Energy-Constrained Readers
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Solution Overview
Problem
RFID readers in battery-operated devices consume excessive energy due to frequent interrogations of multiple RFID systems, especially when integrating different frequency bands like NFC and EPCGlobal, and face challenges in co-operation with GSM transceivers, leading to battery draining and unreliable operation.
Innovation Solution
A radio unit capable of transmitting interrogation signals on different frequency bands simultaneously, allowing continuous powering periods for one band to enable simultaneous interrogation of multiple RFID systems, reducing energy consumption and improving operational reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent interrogations are performed to ensure reliable RFID access, then the user experience and system reliability improve, but energy consumption increases proportionally
Solution Approach 1:
The patent combines multiple RFID frequency band interrogations (e.g., 868 MHz and 915 MHz bands) into a single unified interrogation procedure. Instead of performing separate scans for each frequency band, the reader transmits a single interrogation signal that can detect tags across multiple frequency bands simultaneously, thereby reducing the total number of interrogations required while maintaining reliable access.
Solution Approach 2:
The patent implements a universal interrogation signal that functions across multiple RFID frequency bands. The reader is designed to transmit a single signal format that can interrogate tags operating on different frequency bands, making the interrogation process multi-functional and eliminating the need for separate specialized interrogation procedures for each band.
2Adaptability or versatility
If multiple RFID systems operating on different frequency bands are scanned separately, then comprehensive tag detection is achieved, but the number of scans and battery draining increase
Solution Approach 1:
The patent merges the scanning operations for multiple RFID systems into a single unified scan procedure. The reader performs one interrogation that simultaneously detects tags across different frequency bands (e.g., both 868 MHz and 915 MHz bands), eliminating the need to perform separate scans for each system and thereby reducing total energy consumption while maintaining comprehensive detection capability.
Solution Approach 2:
The patent enables continuous tag detection across multiple frequency bands by implementing an uninterrupted interrogation signal that monitors multiple bands simultaneously. This eliminates the gaps and repeated actions that would occur with sequential scanning, maintaining continuous useful action while reducing energy loss.
3Device complexity
If RFID readers and GSM transceivers operate on close frequency bands simultaneously, then device integration is achieved, but isolation difficulties and interference occur
Solution Approach 1:
The patent segments the operation of different communication systems (RFID and GSM) into distinct time slots or frequency resources. By allocating specific time periods or frequency channels to each system, the patent reduces mutual interference while maintaining the ability to operate both systems within the same integrated device.
Solution Approach 2:
The patent introduces an intermediary resource allocation mechanism that mediates between RFID and GSM operations. This intermediary manages the shared radio frequency resources, assigning them to different systems at appropriate times or frequencies, thereby enabling coexistence while maintaining communication reliability.
4Adaptability or versatility
If time interleaving is used to separate RFID and GSM operations, then frequency band coexistence is achieved, but RFID scanning periods are interrupted
Solution Approach 1:
The patent combines RFID scanning operations with the available time slots from GSM operations rather than treating them as separate, conflicting processes. By merging the scanning function into the existing time slot structure, the patent eliminates idle scanning periods and maintains continuous productivity while achieving frequency band coexistence.
Solution Approach 2:
The patent implements dynamic scanning that adapts to the real-time availability of time slots. Instead of fixed, rigid scanning schedules that are interrupted by GSM operations, the system dynamically adjusts scanning timing to utilize available slots efficiently, maintaining productivity while coexisting with GSM communications.
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
This approach allows for substantial energy savings and increased interrogation frequency, enabling smoother and more efficient RFID communication without interfering with other active systems, particularly useful in applications requiring quick recognition of RFID communication units.
Implementation Method 1
a radio unit configured to transmit: a first radio signal on a first frequency band in order to interrogate first communication units compatible to a first radio frequency identification system; and a second radio signal on a second frequency band in order to interrogate second communication units compatible to a second radio frequency identification system
Data Source
AI summary
A dual mode interrogation is carried out by sending narrow band radio frequency interrogation (RFID) signal for narrow band RFID communication units, the narrow band signal comprising substantially continuous periods, and by sending a high data rate RFID interrogation signal during the substantially continuous periods of the narrow band RFID signal so that two different types of RFID communication units are interrogated substantially simultaneously.