BAP RFID: The Best of Both Worlds The ISO/IEC 18000-6:2010 Class 3 standard defines an innovative class of RFID known as Manchester-encoded Battery Assisted Passive (BAP) or oftentimes referred to simply as Class 3. BAP RFID tags have the range and memory capacity of active tags but at a percentage of their cost. Using a "reader-talks-first" method, the batteries on BAP tags are triggered only when scanned with a reader. Once triggered, they leverage the power of the battery to enhance the tag's functions. Class 3 tags present range capabilities of up to 100 meters in free space and offer the ability to read in RF-challenging conditions, for instance within food pallets or pharmaceutical cases, or surrounding metals and liquids that can be found at equipment yards, airports or freight terminals. Once read, the tag goes back to "sleep", increasing the tag's battery life for as long as five years. The battery also enables the option of attaching sensors to check and log temperatures or other conditions, keep accurate time, and convey that data on-demand.
BAP RFID is primarily different from passive and active RFID given that it implements the "reader-talks-first" principle. The tags usually do not actively transfer signals to the reader, instead they reflect back (or backscatter) the reader signal. With the BAP technology, the tag is always prepared to respond to a reader query and the reader can implement the appropriate business logic to decide when and how often tags should be read. Furthermore, the ISO/IEC BAP RFID Standard utilizes advanced tag selection capabilities, enabling readers to only ask for replies from tags matching distinct selection requirements. Utilizing the "reader-talks-first" principle, together with the sophisticated tag selection capabilities, readers can inventory all tags on a programmable routine time frame while also constantly inventory tags according to particular selection criteria (e.g. only read tags that have alarm events). For example, a reader in a infirmary nursery is capable of performing an inventory of all newborn tags every seven seconds. Somewhere between this seven second period, the reader can frequently inventory tags, locating only tags that have an alarm event present. This offers sub-second response time for alarm event recognition. Moreover, whenever a tag is not read within a routine inventory round, the system doesn't have to wait for the tag's future beacon interval to search for the tag (as with Active RFID systems). Instead, the system can take rapid proactive motions to demand the expected reader, and all other applicable readers, to "search" for the lost tag.
The reader-talks-first principle also simplifies portal uses cases (exits, elevators, etc.) where the reader can inventory all tags in the designated read zone. Tags in the particular read zone will reply to the reader, and the system can make the appropriate actions. With the reader always triggering communication with the tags, BAP Class 3 technology simplifies the system architecture and eliminates the demand for extra exciter devices, saving resources and simplifying deployments.
One other vital advantage of the Standards-based BAP RFID technology is the frequency range over which the tag and reader communicate. Single channel systems are subject to disturbance by jamming, whether accidental or intentional.Sophisticated tags with multiple security sensors become worthless if the reader-to-tag communication can be simply jammed. Class 3 readers and tags employ a frequency hopping communication protocol, which cuts down interference and the risk of jamming the RF signal. This frequency hopping ability, combined with the capability to frequently search for specific tags, enables the system to find the optimum frequency to correspond with the tag even in challenging RF environments. Additionally, if an interference or jamming event does happen, our readers can recognize the event, determine the impacted reader(s) and convey to the system to take instant and acceptable actions.
BAP technology (Class 3) presents an exceptional solution for applications demanding more functionality than passive systems (Classes 1 and 2), and a lower cost than active systems (Class 4).
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Is there an Alternative to Passive and Active RFID Systems?
Category: Technology
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