Modified Slotted ALOHA protocol for RFID tag collisions

As RFID tags become popular, their volume in both the number of applications and the sheer number per application is bound to increase. This increase in density of RFID tags at any given location invariably results in collision problems that occur when a reader tries to simultaneously read multiple tags that are present in its field. The Slotted ALOHA protocol and its variants have been used over the years to alleviate similar collision problems in communication systems. We consider the basic Slotted ALOHA protocol for RFID applications, and propose a modified approach with improved performance characteristics.