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This paper consists of two parts: the protocol for tag-to-tag mesh network (T2T-MN) and the implementation of dual-radio RFID system. Recently, RFID has been adopted in ports or warehouse, being attached to containers and palettes for loading/unloading automation. However, the RFID system has encountered one problem—some tags cannot receive any command from reader intermittently due to signal interference...
As the primary contact less identification technology, radio frequency identification (RFID) has been enabled a mass market, and the advantages of RFID have been widely acknowledged. This paper proposes an improved QT protocol called Hybrid Technique based Query Tree (HTQT) by adopting randomized prefix and Manchester coding. It can reduce the collisions by bit collision detection and decrease the...
Wireless sensor networks (WSNs) have been considered as a promising method for reliably monitoring both civil and military environments under hazardous or dangerous conditions. Depending on different applications, data transmission in the WSNs maybe mixed with the demands for reliability awareness, energy efficiency and time sensitivity. Therefore, Reliable data transmission with the lowest energy...
Wireless sensor networks have been considered as a promising method for reliably monitoring and information collection. As a rule, the power supplies for sensors in the network are not usually rechargeable or replaceable. Therefore, the energy efficiency is critical for the lifetime. However, due to the high density of sensor nodes, a lot of energy has been wasted on medium access competition because...
Wireless sensor networks (WSNs) have been considered as a promising method for reliably monitoring both civil and military environments under hazardous or dangerous conditions. Depending on different applications, data transmission in the WSNs maybe mixed with the demands for reliability awareness, energy efficiency and time sensitivity. Therefore, Reliable data transmission with the lowest energy...
The advantages of wireless sensors and RFID technology have been widely acknowledged. Based on the two advanced technologies, we improved our current RFID system by replacing passive tags with active sensor tags. Toward better performance on new system demands, in this paper, we proposes an improved QT protocol called SQT (Sensor tag based Query Tree protocol) which combines the basic principle of...
In radio frequency identification (RFID) systems, the anti-collision protocol is a key topic that has attracted a great deal of research interest. The protocols can be divided into two categories: ALOHA-based and binary query tree (QT) algorithms. The ALOHA-based protocols avoid collisions by distributing tags into different stochastic timeslots. In contrast, the QT-based protocols achieve a reliable...
Wireless sensor networks (WSNs) have been considered as a promising method for reliably monitoring both civil and military environments under hazardous or dangerous conditions. Depending on different applications, data transmission in the WSNs maybe mixed with the demands for reliability awareness, energy efficiency and time sensitivity. Therefore, Reliable data transmission with the lowest energy...
Cooperative communication has been considered as a promising method for benefiting the advantages from MIMO (multiple-input multiple-output) system for single antenna mobiles in the wireless network, and many important milestones in this area have been achieved, leading to a flurry of research activity. Especially, cooperative communication in wireless sensor networks (WSNs) has gained so much interest...
Anti-collision algorithms in the RFID system can be divided into two categories: ALOHA based and binary tree based algorithm. Each of them has its own advantages or disadvantages. The QT protocol, as a classic binary tree based algorithm, was proposed to achieve the reliable throughput of identification by using prefix to avoid collisions. This paper proposes an improved QT protocol called Bit collision...
Wireless sensor networks (WSNs) have been considered as a promising method for reliably monitoring both civil and military environments under hazardous or dangerous conditions. Due to the special property and difference from the traditional wireless network, the lifetime of the whole network is the most important aspect. The bottleneck nodes widely exist in WSNs and lead to decrease the lifetime of...
Wireless sensor networks (WSNs) have been considered as a promising method for reliably monitoring both civil and military environments under hazardous or dangerous conditions. Due to such environments, the power supplies for sensors in the network are not usually rechargeable or replaceable. Therefore, the energy efficiency is critical for the lifetime and cost of WSN. Numerous mechanisms have been...
Wireless sensor networks (WSN) have been considered as a promising method for reliably monitoring both civil and military environments under hazardous or dangerous conditions. Due to such environments, the power supplies for sensors in the network are not usually rechargeable or replaceable. Therefore, the energy efficiency is critical for the lifetime and cost of WSN. Numerous mechanisms have been...
The RFID technology has attracted much attention these days due to the far better efficiency than the barcode and magnetic card system. As an important usage, the 433 MHz active RFID tag was already adopted to the container ports in the United States and Europe for container loading and unloading automation and equipment location. However, for the complete automation, one problem should be solved...
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