260 ITU‐T's Technical Reports and Specifications An RFID system comprises a number of elements: RFID reader / writer: The reader writer is used to communicate with the tags that may pass within range. The RFID reader writer will normally be located in a fixed position and will be used to interrogate an RFID tag. Dependent upon the application and the format of the system and the RFID reader / writer, data may also be written to the RFID tag. RFID tag: RFID tags may also be called RFID transponders and are typically located on items that are mobile. They are small and generally cheap so that they can be attached to low cost (or high cost) items that need to have information associated with them. They are also generally considered as being disposable. The RFID tag contains data that is relayed to the reader, and in some systems it may also be possible to update the data within the tag to indicate that the tag and hence the item has undergone a specific stage in a process, etc. RFID application software: like all systems these days, RFID systems need application software to run the overall system. With many systems there will be a number of different reader / writers and the data to and from these needs to be coordinated and analyzed. A specific application software will be required for these. Although each RFID system will vary according to its requirements, the aforementioned are the main elements which can be found. RFID technology has become widespread in its use. It offers many advantages and RFID is a particularly versatile system, being able to be used in many areas from shops, to manufacturing plants and also for general asset tracking, as well as a host of other innovative applications. The following diagram described the RFID elements: Type Details Air Interface Technical specifications regarding the wireless connection interface between the RFID tag and the reader Code System System of identifier codes to be recorded on RFID tags Middleware Common processing function of the applicable middleware system to apply various RFID