RFID Interrogator Mesh Network for Wireless Backhaul
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Solution Overview
Problem
Deploying an RFID network is hindered by the complexity and cost of conventional wired backhaul networks, and the interference issues associated with using conventional wireless data networking technologies.
Innovation Solution
Implementing a wireless network that allows interrogator elements to communicate bidirectionally by temporarily operating as both RFID readers and tags, using a digital radio transceiver with advanced modulation techniques and protocols to facilitate two-way communication over RFID channels, thereby creating an interrogator mesh network for efficient data routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wired Ethernet network is coupled to each RFID interrogator, then reliable data transmission is achieved, but the system becomes expensive and complex with separate cables required for each interrogator
Solution Approach 1:
The patent replaces the mechanical wired Ethernet connection system with a wireless RFID-based communication system. Interrogators communicate with each other wirelessly using RFID interrogation requests and replies, eliminating the need for physical cables and wired infrastructure while maintaining reliable data transmission for backhaul communication.
Solution Approach 2:
The patent enables RFID interrogators to perform multiple functions: they not only interrogate RFID tags for data collection but also communicate with each other wirelessly using the same RFID radio frequency interface. This multi-functionality eliminates the need for separate wired backhaul infrastructure.
2Device complexity
If conventional wireless data networking technology is used for the backhaul network, then cost and complexity are reduced, but interference from other users of the wireless technology occurs
Solution Approach 1:
The patent changes the operating parameters by using RFID-specific radio frequency channels and modulation schemes instead of conventional wireless data networking protocols. This allows the backhaul network to operate in dedicated frequency bands with controlled transmission patterns, minimizing interference from other wireless users while maintaining wireless communication capabilities.
3Object-affected harmful factors
If RFID interrogators remain inactive while nearby interrogators transmit, then interference is avoided, but communication efficiency between interrogators decreases
Solution Approach 1:
The patent implements periodic transmission cycles where interrogators take turns transmitting interrogation requests and receiving replies in structured time slots. This periodic action allows multiple interrogators to communicate efficiently while maintaining controlled interference levels through coordinated transmission timing and listening periods.
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 enables efficient interconnection of RFID interrogators over long distances while minimizing interference and reducing costs by leveraging existing wireless technologies, allowing for reliable two-way communication within the network.
Implementation Method 1
Certain RFID tags are referred to as 'passive,' and typically derive operating power by harvesting ambient RF energy.
Implementation Method 2
To transmit stored data to the RFID interrogator, passive RFID tags typically employ backscatter techniques, which modulate reflected RF energy originating from the RFID interrogator.
Implementation Method 3
To transmit stored data to the RFID interrogator, active RFID tags typically generate a modulated RF signal.
Data Source
AI summary
One embodiment of the present invention sets forth a technique for efficiently interconnecting RFID interrogator elements. Each interrogator element is configured to function as both an RFID interrogator and an RFID tag. The RFID interrogator function enables one interrogator element to perform a read or write data operation to a second interrogator element functioning as an RFID tag. Two-way communications between interrogator elements is facilitated by read and write operations. A data backhaul network may be advantageously implemented as a wireless mesh network, comprising a plurality of interrogator elements, to transmit data from each interrogator element to a server for processing.