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![A Novel Anti-collision Protocol in Adaptive Framed Slotted Aloha about RFIDTags
Deng Zhongting, Wu Haifeng* , Liu Jing, Tan Yuan
Algorithm 1. ADFA Reader Operation
1 Start
2 % Initialize L and RSC % L is frame length.
3 if RSC=NULL
4 L=N % N is set by user (frame size)
5 else
6 L=RSC (frame size = readable s n)
---------7 end if
8 RSC=0
------------9 do {
10 SC=0 % initialize SC
11 Transmit the command starting a frame
-----------------12 do {
13 Transmit the command starting a slot
14 Receive tag response and detect a
collision
15 if tag collision
16 f=collision
17 Transmit f
18 else if no tag response
19 f=idle
20 Transmit f
21 else only a tag response
22 Receive ID from tag and store it
23 RSC=RSC+1
24 f=successful
SC = Slot Counter
RSC = Readable slot number
frame length in a read cycle is set to
the RSC’s value in the last cycle
25 Transmit f with RSC
26 end if
27 SC=SC+1
28 }while SC<L ( end do line 12)
29 [E, S, C]=performCountSlot(L)
30 % Counts empty, successful and collision slots in
31 % a frame with L
32 L=2C
33 }while C>0 ( end do line 9)](https://image.slidesharecdn.com/rfid-20tag-20anti-collision-20protocols-140309144556-phpapp02/75/RFID-tag-anti-collision-protocols-20-2048.jpg)
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RFID tag anti collision protocols
A tree-based anti-collision protocol is proposed for RFID tag identification. The protocol uses a binary tree structure where tags respond in assigned slots determined by their IDs. In each time slot, the reader broadcasts a query and any responding tags transmit their IDs. If a collision occurs, the reader divides the tags into two groups for the next slot based on their IDs. This process continues until all tags are identified without collision. The protocol reduces the identification time compared to Aloha-based methods.
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- 7. Binary Tree Dong-Her Shih2006 1 2 3 4 5 6 7 8 9 10 11 12 13 C C E C T1 T3 C T4 C E C T2 T5
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- 9. An Example Tag ID Tag 1 000 Tag2 010 Tag Tag 3 Tag Tag 4 1 Tag 5 Start 101 ID Tag 1 Tag 2 Tag Tag 1 0 1,2,3 1 00 ID 10 0 0 0 1 1,2 Tag Tag 2 Tag ID Tag 1 0000 Tag 2 0010 Tag 3 0101 Tag 4 1100 Tag 5 1101 Tag Tag 3 1 2 100 101 ID 4,5 1 Tag 0 Tag 4 0 Tag E 1 4,5 5 1 0 Tag Tag 4 ID 3 Tag 5 01 ID Tag ID ID 0 Tag04 4 4,5 ID 00 01 E 1 5 Tag Tag 4 ID
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- 13. DFSA After first broadcastdetermine three parameters: 1. Collision slots 2. Success slots 3. Empty slots Then estimate unread tags: If Collision slots> threshold then increase slots Else : decrease slots
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- 16. An Anti-collision Algorithmfor Multi-Tag RFID GENG Shu-qin, WU Wu-chen, HOU Li-gang and ZHANG Wang If number of tags are large then the tags can be grouped :
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- 19. A Novel Anti-collisionProtocol in Adaptive Framed Slotted Aloha about RFIDTags Deng Zhongting, Wu Haifeng* , Liu Jing, Tan Yuan SC = Slot number RSC = Readable slot number TSC = Tag slot number frame length in a read cycle is set to the RSC’s value in the last cycle Advantage : Reduce Time Of re-Identification Disadvantage : Increase Number Of Computaion
- 20. A Novel Anti-collisionProtocol in Adaptive Framed Slotted Aloha about RFIDTags Deng Zhongting, Wu Haifeng* , Liu Jing, Tan Yuan Algorithm 1. ADFA Reader Operation 1 Start 2 % Initialize L and RSC % L is frame length. 3 if RSC=NULL 4 L=N % N is set by user (frame size) 5 else 6 L=RSC (frame size = readable s n) ---------7 end if 8 RSC=0 ------------9 do { 10 SC=0 % initialize SC 11 Transmit the command starting a frame -----------------12 do { 13 Transmit the command starting a slot 14 Receive tag response and detect a collision 15 if tag collision 16 f=collision 17 Transmit f 18 else if no tag response 19 f=idle 20 Transmit f 21 else only a tag response 22 Receive ID from tag and store it 23 RSC=RSC+1 24 f=successful SC = Slot Counter RSC = Readable slot number frame length in a read cycle is set to the RSC’s value in the last cycle 25 Transmit f with RSC 26 end if 27 SC=SC+1 28 }while SC<L ( end do line 12) 29 [E, S, C]=performCountSlot(L) 30 % Counts empty, successful and collision slots in 31 % a frame with L 32 L=2C 33 }while C>0 ( end do line 9)
- 21. A Novel Anti-collisionProtocol in Adaptive Framed Slotted Aloha about RFIDTags Deng Zhongting, Wu Haifeng* , Liu Jing, Tan Yuan Algorithm 2. ADFA Tag Operation 1 Energized by reader 2 Enter Ready state 3 while state=Ready & Receive the command starting a 4 frame with reader's L 5 do { 6 Enter Active state 7 if SSC=NULL or SSC>L or SSC<TSC 8 SSC=random number from 0 to L 9 End 10 TSC=0 11 while state=Active & Receive the command 12 starting a slot 13 do { 14 if TSC=SSC 15 Transmit ID 16 Receive feedback f (with RSC) from 17 reader 18 if f= successful 19 SSC=RSC 20 Enter Quiet state 21 else 22 TSC=TSC+1 23 end SC = Slot Counter TSC = Tag slot Counter increase by one SSC = Selected Slot Number SSC<TSC means : the tag has not been identified in last cycles frame length in a read cycle is set to the RSC’s value in the last cycle 24 else 25 TSC=TSC+1 26 end 27 } 28 Receive the command terminating this frame 29 form reader 30 if state=Active 31 Enter Ready state 32 end 33 }