rfid system is a wireless technology that can transfer data between tags and readers via radio frequency. in an rfid network, readers are located close to each other to obtain optimal connectivity and sufficient coverage. in such an environment, which is called dense reader environment (dre).different types of collisions such as reader-to-reader and reader-to-tag ones, often lead to serious pro...

a typical radio frequency identification system (rfid) includes one reader and a number of tags. the reader transmit to commands to the tags with interrogation radio signals, and tags receive the command and then respond with their identification. readers with interrogation signals can read tags’ responses. in rfid systems, when multiple tags respond to one reader simultaneously, tag collision ...

Radio Frequency Identification (RFID) systems are being intensively used recently for automated identification. Every object can be detected as one form of an electronic code. At the beginning, the main purpose of RFID tag usage is meant to be an improvement of barcodes. Besides the fact that an RFID tag does not need line of sight to obtain its ID, the tag is also water and dirt resistant. Mor...

RFID is a wireless communication technology that provides automatic identification or tracking and data collection from any tagged object. Due to the shared communication channel between the reader and the tags during the identification process in RFID systems, many tags may communicate with the reader at the same time, which causes collisions. The problem of tag collision has to be addressed t...

RFID is core technology in the area of ubiquitous computing.To identify the objects begins with the reader query to the tag attached to the subject. When multiple tags exist in the reader’s interrogation zone, these tags simultaneously respond to the reader’s query, resulting in collision. This kind collision makes the reader to take long time to identify tags within the reader’s identification...

In large-scale RFID systems, all of the communications between readers and tags are via a shared wireless channel. When a reader intends to collect all IDs from numerous existing tags, a tag identification process is invoked by the reader to collect the tags’ IDs. This phenomenon results in tag-to-reader signal collisions which may suppress the system performance greatly. To solve this problem,...

In an RFID system, tags can be identified by a reader when they are within the interrogation zone of the reader. Collisions occur when tags using backscatter technology report their IDs to the reader at the same carrier frequency simultaneously. The performance of tag identification is degraded by collisions, so it is important to address the tag collision problem. Several anti-collision protoc...

Radio frequency identification (RFID) is prominent technology for fast object identification and tracking. In RFID systems, reader-to-reader or tag-to-tag collisions are common. Majority of probabilistic and deterministic anticollisions methods are inefficient in channel distribution and improving the performance. In this work, simulation annealing based anti-collision protocol is proposed wher...

The efficiency of tag identification in an RFID (radio identification system) can be low down due to the tag collision problems. The tag collision problem occurs when a reader try to read multiple tags in an interrogation zone. As a result, the reader doesn’t identify the tag correctly. That causes a loss of information or data interference. To solve such kind of issues a series of ALOHA based ...