Introduction Overview of RFID Technology Physics of RFID RFID Middleware RFID Application Help Exit
m |
1 |
Q |
0 |
m |
Simultaneous transmissions in RFID systems lead to collisions. Communication between a single reader and a single tag can go without any collision. But when a single reader is communicating with morę than one tag or two or morę readers are operating in a closer network, probability of colliding of data arises. To solve this problem, we use some protocols like ALOHA, binary tree, query tree etc.
-1 ’rLieory
• BFSA has the fixed frame size N (N slots in one frame) and N = 3 in • Conventional Slotted ALOHA Algorithms
abovefig. Number of RFID tags —^ Collision ratę —^ Tag recognition ratę
• In worst cases, no tag may be identified though the repeated reading cycle if a lot of tags exist and all the slots are filled with tag collision.