Analysis of common problems in UHF RFID projects

2019-07-19 16:48:54 8

Applied to open or closed loop?

  Enterprises adopt RFID to be divided into closed-loop applications and open-loop applications, closed-loop applications (referred to as internal use in the company) and open-loop applications (so that they are applied to the entire supply chain, and their requirements for synergy are higher, and may include packaging suppliers, Contract manufacturers, third-party logistics companies and retailers, etc.). The internal closed-loop system is characterized by a good entry option as companies can evade industry standards and synchronize with external partners. Nowadays, the main RFID applications are also closed-loop applications. Open-loop applications will bring huge benefits, but the implementation is difficult and costly. The current major open-loop application is the RFID project implemented by retailers such as Wal-Mart, but it only involves the retail-supplier value chain. The supplier is required to use RFID on every pallet sent to Wal-Mart stores. label.

  RFID standard problem

  RFID applications involve many technologies, and they involve a range of standard issues, from radio frequencies, data formats, encodings, and more. At present, RFID has not yet formed a unified global standard, and the market is a situation in which multiple standards coexist. However, with the beginning of large-scale application of RFID in the global logistics industry, the unification of RFID standards has been widely recognized by the industry. The RFID system is mainly composed of two parts: data acquisition and back-end database network application system. The standards that have been released or are currently being developed are mainly related to data collection, including the air interface between the electronic tag and the reader, the data exchange protocol between the reader and the computer, the RFID tag and the reader. Performance and conformance test specifications, as well as data content coding standards for RFID tags. The back-end database network application system does not currently form a formal international standard. Only a few industry alliances have formulated some specifications, and the current stage is still evolving.

  The core of the RFID standard competition is mainly in the field of data content coding standards for RFID tags. At present, five major standards organizations have been formed, representing the interests of different groups or countries in the world. EPC Global is jointly established by UCC Product Coding Organization of North America and European EAN Product Standards Organization. It has hundreds of members worldwide and is supported by retail giant Wal-Mart, manufacturing giant Johnson & Johnson, Procter & Gamble and other multinational companies. AIM, ISO, UID represent Europe and the United States and Japan; IP-X members are mainly in Africa, Oceania, Asia and other countries. In comparison, EPC Global has the upper hand because of the combination of US and European manufacturers.

  Currently, the main RFID technology in the UHF (Ultra High Frequency) frequency band uses the 860MHz to 960MHz frequency band. The so-called standard dispute mainly refers to the standard competition in this frequency band. Because it has the most suitable characteristics for international logistics management.

  ThingMagic product configurable support, including FCC (NA, SA) 902-928MHz, ETSI (EU) 865.6-867.6MHz, MIC (Korea) 910-914MHz, SRRC-MII (PRChina) and other multi-protocol multi-region frequency characteristics It also supports users to customize the frequency band from 860MHz to 960MHz, which meets more national standards and supports a wider range of applications.

  How do RFID and barcodes coexist?

  For a long time, barcodes and RFID will be in a coexistence state. At present, the application fields of electronic tags are mainly containers, pallets, crates, or goods with high value of items (such as HP attaching RFID tags to printers). The cost of an electronic tag is between 20 and 25 cents. Even with optimistic estimates, the cost of an electronic tag can be reduced to 1 to 5 cents over the next three to five years, compared to the extremely low cost of a bar code. It is still impossible for electronic tags to replace bar codes in the short term.

  Therefore, in the current RFID project, RFID tags and barcodes are generally present at the same time, that is, RFID tags and barcodes are attached at the same time. Therefore, there must be an RFID reader and a barcode scanning device at the same time. Also consider the conversion problem between the RFID tag and the bar code identifier. Both EPC encoding and barcode use EAN.UCC encoding. They are easy to convert.

  Is EPC coding or custom coding?

  The RFID tag can store data in any format. GEN1 is up to 128 bits and GEN2 is 496 bits, so you can save the EPC format code on the RFID tag or save your own defined data. As long as it does not exceed the maximum length. The usual practice is to store only a unique identifier on the RFID tag, and its corresponding data is stored in the background data.

  Another problem is whether the code only saves the code or saves other data. Only the code is saved so that the query is a database to associate the tag on the tag with the specific business information, such as the product corresponding to the tagged item. Name, date of manufacture, manufacturer, etc. If you save the data on the label, you can display or use it directly without querying the database.

  How to achieve 100% recognition rate?

  Many technologies are not 100% reliable, but they do not affect us, such as PCs. Even for bar codes, we use manual methods to scan one by one, but there is no guarantee that this worker will not make mistakes and there will be no leakage reading.

  The advantage of RFID technology is more reflected in the group reading, and the core of this advantage lies in the anti-collision algorithm. ThingMagic products have industry-leading anti-collision algorithms. At the same time, combined with 750 tags/sec high-speed read capability, the target tag information can be obtained faster and more accurately in the same time, which can give customers a higher multi-label. Application space.

  At the same time, a good process design, some necessary fault-tolerant mechanisms, can serve our final application system, enabling RFID to achieve 100% recognition rate in the actual application process.

  Maximize the impact of collected data

  If you do not process or analyze the data read by the reader, you will not be able to generate revenue. Therefore, RFID projects should make full use of the collected data, combine tag data with business data, business processes, and integrate with the back-end IT system to Integrate with ERP, B2B, BI, DSS, CRM and other systems to achieve data visibility and process automation, improve efficiency and reduce costs.

  At present, many closed-loop RFID applications are concerned about this in the absence of open-loop supply chain information standards. For example, some clothing stores in Japan and Shanghai use RFID technology CRM customer relationship management system, Beijing Workers Stadium RFID ticket system, combine RFID information with customer information, point information and even customer travel route information to create more tailor-made CRM. System to enhance the customer's quality service experience.

  Tags and readers are often mistaken for EPC/RFID business goals. But in fact, the business objectives of EPC/RFID go deep inside the enterprise, and only the original data is applied to the enterprise workflow. The return from RFID technology is directly proportional to the number of times the tag information is used throughout the process. That is, companies should pay more attention to applications that enable EPC/RFID data to be applied to the entire business process. “Read and shoot”, the more times you read EPC/RFID data in the process, the more you analyze and guide the business practice with this data, the more your business returns.

  In the future open-loop supply chain, the enterprise's neural network has the ability to extend the entire process of the entire supply chain, installing RFID/EPC, the real-time “clairvoyary eye” and “shunfeng ear”, and the enterprise brain – ERP and BI will interact in real time. . Just like us, more reading and more thinking will make more thinking. The massive real-time data brought by RFID/EPC will help the decision-making layer to make more effective judgments. Through the "details data" brought by RFID/EPC, manufacturers can be more lean in production, merchants can be more considerate and care, and logistics and distribution are more immediate.

  The important role of RFID middleware

  RFID middleware (RFID Edge Server) is a very important part of EPCglobal's recommended RFID application framework. It is responsible for information interaction and management with RFID hardware and supporting equipment, and serves as a bridge between software and hardware integration. Information exchange for upper complex applications. Currently, EPCglobal has introduced corresponding specifications (ALE, application level events) to unify and standardize software implementations at this level.

  The RFID middleware acts as an intermediary that shields the complexity of the front-end hardware and sends the collected data to the back-end IT system. In addition to RFID middleware, for a complex application, other software is needed to maximize the role of RFID. Maximize ROI. As shown below, the complete RFID software solution provided by BEA. From the reading, saving, processing, analysis of RFID data, to the integration of other application systems, access control through the portal, etc.

  ThingMagic provides a complete software development kit, which allows customers to understand the esoteric RFID technology, whether it is integrated into the middleware or the final application system. It only needs a simple API to get excellent RFID performance. Serving a variety of systems. What's more, ThingMagic's full line of products uses the same API, so that customers can more rationally configure ThingMagic devices without worrying about additional software development work.

  Cost analysis of RFID projects

  When it comes to the cost of RFID projects, many people immediately think about the cost of the label and think it is the most important factor. In fact, this is not true. First of all, it is now generally labeling reusable assets. For example, containers in the field of logistics, pallets, etc., high-value items in asset management, etc., labels can be reused. In addition, the price of the label can be neglected compared to the value of the items themselves.


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