Section: New Results

RFID

Participants : Roudy Dagher, Grégory Guche, Nathalie Mitton, Loïc Schmidt, David Simplot-Ryl.

Following the 'Internet of Things' concept, each object will be associated with a unique identifier which will allow to retrieve information about it in large databases. EPC Global(http://www.epcglobalinc.org ). In this framework and in the one of ICOM, ASPIRE and DECARTE projects, the POPS has investigated several aspects linked to the RFID EPC-compliant middleware [24] .

In the process of retrieving information, the identifier (ID) may have to be translated into different formats (e.g. domain name style format for object name service query, binary, legacy,...). The Tag Data Translation (TDT) is responsible for the translation of IDs into these different formats. In [18] , we have proposed a general TDT system which extends the standards of EPCGlobal which only targets Electronic Product Code (EPC). We have integrated other RFID and smart cards standards (such as ISO 14443 and 15693) and GS1 standards which are more general as they also deal with bar code (EAN/UPC).

Another important module in the EPC architecture is the Object Naming Service (ONS). The ONS is a central lookup service used in the EPCglobal network for retrieving the location of information about a specific EPC. This centralized solution lacks scalability and fault tolerance. In [25] , we present the design principles of a distributed solution for ONS lookup service. In distributed systems, the problem of providing a scalable location service requires a dynamic mechanism to associate identification and location. We show that the use of Distributed Hash Tables (DHT) is a good candidate for distributing as it provides such a mechanism. We then outline how to adapt the DHT principles (operations on objects or nodes) to the ONS distribution problem.