RFID-based Distributed Memory for Mobile Applications

Abstract

Abstract. The goal of our work is to give a user equipped with an RFID-enabled mobile handset (mobile phone, PDA, laptop. . . ) the ability to know the contents of distant passive RFID tags, without physically moving to them and without using a Wireless Area Network. The existing architectural patterns involving passive tags do not meet simultaneously all of these requirements. Our RFID-based distributed memory does. By associating vector clocks to tags, we replicate a view of this memory on each tag and each handset, and disseminate updates between all of the replicas. Thus a user can locally query the replica hold by their mobile handset without physically moving to a tag. We have developed a pervasive game as an application example. Using data collected during real game sessions, we evaluate the performance of our distributed memory. Then we discuss staleness and scalability issues. We conclude and give perspectives of our work.

Choosing the Right RFID-Based Architectural Pattern

“…RFID-based distributed shared memory (RFID-based DSM) mixes the qualities of semi-distributed architectural pattern and distributed architectural pattern [7]. The avatar of an RFID tag is stored in the RAM of the tag.…”

“…In the distributed architectural pattern, each RFID tag holds the avatar [6]. With the RFID-based Distributed Shared Memory, RFID tags hold the avatar and a replica of the avatar of other tags [7]. Sections 3 to 6 detail all of these architectural patterns: they present application examples and analyze the architectural pattern with the attributes identified in section 2.…”

RFID-based Distributed Shared Memory for Pervasive Games

“…To do so, whenever a mobile handset comes in contact with a tag (or another handset), these two elements compare vector clock values and update their own replica of DM (see [7] for algorithms). Thus, each element takes advantage of the knowledge of the other one to get more recent information concerning DM evolutions.…”

“…Our goal is to provide an architecture where a mobile handset can get the value of data stored in distant RFID/NFC tag. Classical solutions are based on the use of a server [7]. But a Wireless Area Network is required to communicate with a server.…”

“…This paper presents a demonstration of our solution, the RFID-based Distributed Shared Memory (RDSM) [7]. Data are stored in a memory which is distributed among the different tags and mobile handsets (mobile phone, PDA, laptop.…”