Abstract
Current commodity RFID systems incur high communication overhead due to severe tag-to-tag collisions. Although some recent works have been proposed to support parallel decoding for concurrent tag transmissions, they require accurate channel measurements, tight tag synchronization, or modifications to standard RFID tag operations. In this paper, we present BiGroup, a novel RFID communication paradigm that allows the reader to decode the collision from multiple COTS (commodity-off-the-shelf) RFID tags in one communication round. In BiGroup, COTS tags can directly join ongoing communication sessions and get decoded in parallel. The collision resolution intelligence is solely put at the reader side. To this end, BiGroup examines the tag collisions at RFID physical layer from constellation domain as well as time domain, exploits the under-utilized channel capacity due to low tag transmission rate, and leverages tag diversities. We implement BiGroup with USRP N210 software radio that is able to read and decode multiple concurrent transmissions from COTS passive tags. Our experimental study gives encouraging results that BiGroup greatly improves RFID communication efficiency, i.e., 11 x performance improvement compared to the alternative decoding scheme for COTS tags and 6 x gain in time efficiency when applied to EPC C1G2 tag identification.
Original language | English |
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Title of host publication | MobiCom 2015 - Proceedings of the 21st Annual International Conference on Mobile Computing and Networking |
Publisher | Association for Computing Machinery |
Pages | 500-511 |
Number of pages | 12 |
Volume | 2015-September |
ISBN (Electronic) | 9781450336192 |
DOIs | |
Publication status | Published - 7 Sept 2015 |
Event | 21st Annual International Conference on Mobile Computing and Networking, MobiCom 2015 - Paris, France Duration: 7 Sept 2015 → 11 Sept 2015 |
Conference
Conference | 21st Annual International Conference on Mobile Computing and Networking, MobiCom 2015 |
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Country/Territory | France |
City | Paris |
Period | 7/09/15 → 11/09/15 |
Keywords
- Parallel decoding
- Physical layer
- RFID systems
ASJC Scopus subject areas
- Software
- Hardware and Architecture
- Computer Networks and Communications