SLRRP spurs large-scale RFID rollouts

Radio frequency identification readers were originally operated as peripherals typically connected to a host computer via a serial port to support a dedicated application. This works OK for deployments involving modest numbers of readers performing a specific targeted business function, but to accommodate large-scale RFID production environments, readers are evolving to support TCP/IP stacks connected via wired or wireless networks.

A typical RFID deployment would consist of a network of RFID readers controlled by one or more Reader Network Controller (RNC) element. Implemented in the form of software in a server, embedded software in a router or switch, or a stand-alone device, this controller provides the control and data path interface to a reader network. The RNC is connected to servers running RFID-enabled client applications, as well as management applications that monitor operations of the reader network.

This network-centric architecture calls for a simple, flexible controller-to-reader protocol. The IETF is deciding on chartering a working group to develop the Simple Lightweight RFID Reader Protocol (SLRRP [pronounced “slurp”]). SLRRP is a proposed protocol for use in an IP-based network to convey configuration, control parameters, status and tag information to and from readers.

A standard reader protocol allows companies to choose the best reader for each function or location, such as readers attached to a dock door, conveyor belt or shelf, or mobile handheld or vehicle-mounted readers. Users could substitute readers based on cost and performance for a specific application. Having such a standard protocol also would help reader vendors to introduce new models of readers quickly and efficiently.

SLRRP’s network-centric interface provides scalability and flexibility, allowing the reader to support the needs of multiple applications, which might have different tag access requirements. Flexibility is provided through multiple air protocol support, high reader density, and diverse reader capabilities, application requirements and tag capabilities.

For example, SLRRP can support multiple air protocols that govern the interaction between tags and readers, such as Class-1, Generation-2 (C1G2). C1G2 has several modes of operation, depending on environment and application. SLRRP has the ability to control these air protocols to permit optimal utilization of the RF spectrum and bandwidth.

The combination of an industry-standard reader protocol that is designed to meet the needs of the next generation of readers with the new tag standards, such as C1G2, will enable the production of high performance RFID readers at lower cost, facilitating the rapid introduction of this new useful technology.

Click here for more information on SLRRP.

Grady is vice president of engineering for Reva Systems. He can be reached at mgrady@revasystems.com.