Radio frequency identification(RFID) system which is a simple form of ubiquitous sensor networks that are used to identify physical objects permits remote, non-line-of-sight, and automatic reading. In RFID system, when a reader sends the ID request command, if there are more than two tags’ responses, their responses will collide on the RF communication link, and thus can not be received by the ...

In this paper, we propose two adaptive frame size Aloha algorithms, namely adaptive frame size Aloha 1 (AFSA1) and adaptive frame size Aloha 2 (AFSA2), for solving radio frequency identification (RFID) multiple-tag anti-collision problem. In AFSA1 and AFSA2, the frame size in the next frame is adaptively changed according to the real-time collision rate measured in the current frame. It is show...

Maximizing the tag reading rate of a reader is one of the most important design objectives in RFID systems as the tag reading rate is inversely proportional to the time required to completely read all the tags within the readers radio field. To this end, numerous techniques have been independently suggested so far and they can be broadly categorized into pure advancements in the link-layer tag ...

Radio frequency identification (RFID) is an emerging wireless communication technology which allows objects to be identified automatically. An RFID system consists of a set of readers and several objects, equipped with small and inexpensive computer chips, called tags. In a dense RFID system, where several readers are placed together to improve the read rate and correctness, readers and tags ca...

Radio Frequency Identification (RFID) is an auto recognition system that consistis of a number of tags and readers. There could be multiple tags a reader should identify. Since a medium is shared by multiple tags, a collision occurs at the reader’s side when two or more tags get transmitted simultaneously. Therefore, anti-collision mechanism that collaborately arbitrates collisions is required....

In radio frequency identification (RFID) systems, if tags transmit their IDs simultaneously, a reader cannot correctly identify the IDs due to collision and the performance of RFID systems degrades by the collision. So, anti-collision protocols to reduce the number of collisions are required. The binary tree anti-collision protocol branches randomly in a tree to reduce collisions in the next id...

Combined with lock algorithm, retreat algorithm and multithreaded processing thoughts; it puts forward an anti-collision algorithm based on multi-threaded RFID lock position. RFID reader sends a quad command, RFID tag response the information of collision position, reduce the amount of data transmission; Fused with lock and multi-status thoughts, the algorithm checks the lock position of card n...

In this paper we discuss how to reduce identification time with a given number of tags in the field of an RFID reader. This paper proposes three methods for fast tag identification: bi-slotted tree based RFID tag anti-collision protocols, query tree based reservation, and the combining method of them. Theses proposed methods can be used for enhancing the identification speed of RFID systems.

The main purpose of Radio-frequency identification (RFID) implementation is to keep track of the tagged items. The basic components of an RFID system include tags and readers. Tags communicate with the reader through a shared wireless channel. Tag collision problem occurs when more than one tag attempts to communicate with the reader simultaneously. Therefore, the second-generation UHF Electron...