This paper introduces the reader collision problem, the problem of allocating frequencies over time to Radio Frequency IDentification (RFID) tag readers such that their interference with one another is minimized. In RFID systems, an RFID tag reader may interfere with the operation of other readers in the system. Interference caused by the operation of an RFID reader is referred to as a reader collision. Reader collisions prevent the colliding readers from communicating with the RFID tags in their respective reading zones. Therefore, reader collisions must be avoided whenever possible to ensure proper and timely communication with tags.
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