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An effective frame breaking policy for dynamic framed slotted aloha in RFID
The tag collision problem is considered as one of the critical issues in RFID system. To further improve the identification efficiency of an UHF RFID system, a frame breaking policy is proposed with dynamic framed slotted aloha algorithm. Specifically, the reader makes effective use of idle, successful, and collision statistics during the early observation phase to recursively determine the optimal frame size. Then the collided tags in each slot will be resolved by individual frames. Simulation results show that the proposed algorithm achieves a better identification performance compared with the existing Aloha-based algorithms
Simulation on probabilistic anti collision protocols of RFID using variable delay
In RFID System, it is important to avoid tag collision for identifying tag faster. In this paper, we proposed concept of variable delay for tag estimation & identification. The scheme is based on the Multi-level dynamic framed ALOHA protocol. Simulation results indicate that the time delay is added to each tag for avoiding collision. The main advantage of this is the delay is in microseconds which will not create problem of more time consumption
Pseudo-random Aloha for Enhanced Collision-recovery in RFID
In this letter we motivate the need to revisit the MAC protocol used in Gen2
RFID system in order to leverage receiver structures with Collision Recovery
capabilities at the PHY layer. To this end we propose to consider a simple
variant of the Framed Slotted Aloha with pseudo-random (deterministic) slot
selection as opposite to the classical random selection. Pseudo-random access
allows naturally to implement Inter-frame Successive Interference Cancellation
(ISIC) without changing the PHY modulation and coding format of legacy RFID
standard. By means of simulations we show that ISIC can bring 20-25% gain in
throughput with respect to traditional intra-frame SIC. Besides that, we
elaborate on the potential of leveraging pseudo-random access protocols in
combination with advanced PHY techniques in the context of RFID applications.Comment: This manuscript has been submitted to IEEE on the 19th September 201
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