RFID have continued to suffer the Reader Collision Problem (RCP). A situation where the RF\r\ninterference wave from a particular Reader distorts the communication between another\r\nReader and it�s neighboring Tags. RCP is common in RFID largely because most RFID\r\napplications deploy large number of Readers. Carrier Sense Multiple Access with Collision\r\nAvoidance (CSMA/CA) has been used by many researchers as a MAC algorithm in\r\naddressing RCP. CSMA/CA alone cannot effectively addressed RCP especially in Dense\r\nPassive type of RFID. In this paper, an improved collision avoidance algorithm is proposed\r\nby incorporating time slotting to CSMA/CA. An RFID network was modeled and simulated\r\nwith varying network load. The result of the simulation shows a throughput of over 960\r\nsuccessful tag reading per seconds with slotted CSMA/CA as against 730 successful tag\r\nreading per second for CSMA/CA and more importantly, a relatively stable probability of\r\nsuccessful tag querying value of 0.82 as against 0.61 obtained from CSMA/CA using a\r\nmaximum of thirty readers and with a simulation time of 180 seconds.
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