AN EFFICIENT ANTI-COLLISION ALGORITHM FOR PASSIVE RADIO FREQUENCY IDENTIFICATION (RFID) NETWORKS
RFID have continued to suffer the Reader Collision Problem (RCP). A situation where the RF interference wave from a particular Reader distorts the communication between another Reader and it’s neighboring Tags. RCP is common in RFID largely because most RFID applications deploy large number of Readers. Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) has been used by many researchers as a MAC algorithm in addressing RCP. CSMA/CA alone cannot effectively addressed RCP especially in Dense Passive type of RFID. In this paper, an improved collision avoidance algorithm is proposed by incorporating time slotting to CSMA/CA. An RFID network was modeled and simulated with varying network load. The result of the simulation shows a throughput of over 960 successful tag reading per seconds with slotted CSMA/CA as against 730 successful tag reading per second for CSMA/CA and more importantly, a relatively stable probability of successful tag querying value of 0.82 as against 0.61 obtained from CSMA/CA using a maximum of thirty readers and with a simulation time of 180 seconds.
RFID, RCP, MAC Algorithm, CSMA/CA
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