RFID sensing network solution and its future development direction

As one of the automatic identification technologies, RFID can identify individual products or objects through the object number contained in the volume label. The active label can also be used to track and locate assets over long distances (1 meter or more); further utilize inline sensing. The RFID tag, plus the sensing and control mechanism, allows the tag to carry more data and more functions. A few years ago, the smartdust project was carried out by the US military Defense Advanced Research Projects Agency (DARPA), which has applied wireless sensing networks to the regulation of agricultural products and vineyards.

The RFID sensing network constructed by the sensing node can be technically driven to be classified by action (moTIon) and image (image), and at the same time, according to the logic of the built-in estimation, the direction and speed of the target object can be related and cooperated with the operation. , sensing and wireless communication capabilities. However, to be able to integrate RFID and inductive networks into a large-scale computing network, you need to:

· Response to message-oriented mediation software (Thecorrespondingmessage-orientedMiddleware)

· Integrate standardized intelligent sensing devices and RFID readers in the network

The main data flow between the RFID and the inductive network flows from many devices on the network edge to some centralized servers, rather than from the central server to the clients on the network, especially in conditional maintenance networks. When using RFID networks in manufacturers and distribution centers. In these systems, sensors or RFID readers detect specific events, transmit the data to the central server for commercial applications, and the application provider can respond to these inputs and schedule related response activities, such as before the fine component fails. Replace it first, or add an order before the sales. In order to be able to process large amounts of data or event filtering, integration (aggregaTIon) and abstracts (AbstracTIon) from sensors or RFID readers to accelerate the execution of new applications, a flexible and automated development of software is needed. In the real-time process control of point of sale (POS) or access control, the RFID sensor system requires actuators that can automatically answer in addition to RFID readers and sensors.

There are usually three types of combinations of RFID readers and sensing devices:

I) The first type is a physical sensor or RFID reader plus a 32-bit microprocessor connected by wired communication and network; mainly the sensing unit and communication gate or RFID reader and RFID controller. See real-time process control in industrial automation.

II) The second type is a mobile (PDA-like) battery-powered handheld device that wirelessly communicates with the backone network; such system applications can be found in RFID-base inventory management, personnel intelligence sensor systems (eg medical control) For maintenance systems with remote conditions (may only start 1 or 2 times a day), battery life should be considered when using the first two.

III) The third category is battery-driven, very low-power, low-performance smart sensing units. These devices include physical sensors plus low-performance (usually only 8-bit) microprocessors, small memory and a low power, close range. The range of wireless RF communications. Compared to the second type of use, the battery life in this class can be longer, because the related system is in a "sleep" mode at 99.9% of the time. These sensing units require a communication gate to connect to a general computer network.

In order to achieve an acceptable response time, the RFID reader or sensor can directly make decisions about the response to the nearest edge server or sensor controller; if it is necessary to reduce the response time, it can be controlled in the sensor/RFID A part that can activate (ShifiTIng) intelligence and responsibility responsibility is placed on the device.

Some systems have remote (remote) specifications, remote device software updates, system diagnostics (including sensor diagnosis), network reliability and stability, and topic-based (by-topicbase) rather than per device (per-device) To access data, especially when large-scale devices are erected, many devices are far away from IT personnel. In this case, it is necessary to effectively provide mission-critical inputs for real-time diagnosis and system overview, including RFID product electronic code. (EPC), temperature or other parameters. Therefore, in a specific application scenario, the intelligent network architecture automatically responds to relevant data, while at the same time taking into account certain network trustworthiness and security.

A wired or wireless network that is connected to a gateway and a drive unit using a sensor unit or an RFID reader. The communication gate is usually a sensor or RFID controller, plus a 32-bit microprocessor; It still differs in different situations.

As for the data filtering, integration and digest actions required in the RFID sensing network, the communication gate is the first priority point, but in consideration of the communication gate performance may be limited by the power and related memory, but can not be stored locally, modified The method is to directly connect the communication unit in the network to the communication gate (refer to the software architecture proposed by IBM, as shown in Fig. 1), and complete part of the data integration and filtering action in the RFID PremisesSever. As for the advanced data accumulation and abstract, it is transparent. It works with RFID Integration Server and different application system drivers.

Figure 1. RFID Softwareware Architecture proposed by IBM to segment the sensed data

In addition to the early military applications, the RFID sensor network has recently seen more reports in newspapers. For example, in June 2006, BP Petroleum Group launched the RFID sensor network pilot program at the petrochemical plant in the UK, which will proactive RFID tags. Attached to chemical containers stored at the Hullpetrochemical plant, RFID technology is used to improve its fuel management, increase inventory visibility and enhance inventory security management.

The latest application shows the NASA and National Science Foundation NSF's temperature and air pressure monitoring program in Antarctica, using RFID sensor nodes or tags to collect and transmit data to research centers in the United States, allowing researchers to The unique identification code, environment and content (including form and quantity) on each node are remotely monitored.

However, if you want to achieve end-to-end RFID sensing network solutions, then the integration of RFID technology and relative computing network architecture is the key. In addition, the wireless sensing system constructed by RFID and WSN related technologies also represents new applications. Possible. How do you define abstracts, engineering guidelines, and communication concepts at different levels of the system? And how to make cross-layer interactions more effective? In order to achieve synergy, it is necessary to reduce response time, data integration and cleanup of problematic data (cleaning), accident management, etc. How to strengthen back-end and make the system more scalable? It is worthy of continuous observation by the industry.

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