Proposed protocols work clumsily in resolving the collisions occurred in dense RFID tag environment. QTDFS-ALOHA, a hybrid protocol which combines the query tree protocol and the dynamic frame slot ALOHA protocol, is proposed. In each frame of this protocol, only tags in the active set are allowed to answer in randomly selected slots. Afterwards, the population of tags in the active set is esti...

An anti-collision algorithm is very important in the RFID system, because it decides tag identification time and tag identification accuracy. We propose improved anti-collision algorithms for RFID system using UHF. In the proposed algorithms, if the reader memorizes the Bin slot information, it can reduce the repetition of the unnecessary PingID command and the time to identify tags. If we also...

Rapid tag collision resolution is a key for the universal adoption of the RFID systems. Based on the function devised to map the tag identifiers and query strings to real values in [0, 1), an Enhanced Binary Query Protocol (EBQP) is proposed. During collision resolution, according to the number of tags identified and the mapped value of the binary query string, the overall tag population is est...

At present, RFID is installed on mobile devices such as mobile phones or PDAs and provides a means to obtain information about objects equipped with an RFID tag over a multi-channeled telecommunication networks. To use mobile RFIDs, reader collision problems should be addressed given that readers are continuously moving. Moreover, in a multichannel environment for mobile RFIDs, interference bet...

In recent years, Radio Frequency Identification (RFID) has become very popular. The main feature of this technology is that RFID tags do not require close handling and no line of sight is required between the reader and the tags. RFID is a technology that uses radio frequencies in order to identify tags, which do not need to be positioned accurately relative to the reader. Tags share the commun...

Emerging applications of RFID require high e–ciency of tag identiflcation. Since passive tags have dumb functionality, the efflciency of tag identiflcation in RFID system relies on the performance of the collision arbitration algorithm embedded in a reader. In this paper, we develop a novel collision arbitration algorithm, which is named Q-Algorithm, improving Q-Algorithm which is introduced in...

Radio-frequency identification (RFID) communication system known as auto-id has experienced tremendous growth worldwide, considering as a flexible mechanism for identification of objects. Degradation of data transmission due to external interference and interference of RFID system itself (tags and reader collision) is one of the most important factors to restrict the development of the RFID sys...

Radio Frequency Identification (RFID) is a very fast emerging technology that wirelessly transmits the identity of a tag attached to an object or a person. It usually operates in a dense tag environment. My work is focused on passive Ultra High Frequency (UHF) tags whose transmission on the Medium Access Control (MAC) layer is scheduled by Framed Slotted Aloha (FSA). In this thesis, I propose t...

Radio Frequency Identification (RFID) technology uses radio-frequency waves to automatically identify people or objects. Despite an emergence of RFID technology, multiple tag identification, where a reader identifies a multiple number of tags in a very short time, is still a major problem. This is known as Collision problem and can be solved by using anticollision scheme. The current tree-based...