Summary In wireless rechargeable sensor networks, sensors are responsible for sensing environment and generating sensed data, mobile devices recharging and/or collecting data to the sink. Because of rapid development charging technology, can be recharged when they within limited ranges devices. addition, because sensors' electric capacity memory storage often limited, must recharged, their generated collected by periodically, or network cannot provide adequate quality services. Therefore,...

Data collection is one of the most important operations in applications wireless sensor networks (WSNs). In many emerging WSN applications, it urgent to achieve a guarantee for latency involved collecting data. Many researchers have studied data WSNs with minimum but without collision while assuming that any (or no) are allowed be aggregated into packet. addition, tree structures often used solutions. However, some cases, fixed number This motivates us study problem minimizing aggregation...

Recently, many studies have investigated scheduling mobile devices to recharge and collect data from sensors in wireless rechargeable sensor networks (WRSNs) such that the network lifetime is prolonged. In reality, because are more powerful expensive than sensors, cost of often consumes a high portion budget. Due limited budget, number limited. Some WRSNs may not be operated without time limits due devices. Therefore, sensing field must weighted by their importance, is, important an area...

Radio frequency identification (RFID) systems have been widely developed and applied in applications. In RFID systems, a tag can be read by reader when the is within reader's interrogation range. Reader deployment has received great deal of attention for providing certain service quality. Many studies addressed deploying/activating readers such that all tags field read. However, practical environment, cannot due to collisions. addition, number often limited constraints processing time link...

Recently, the problem of scheduling readers to read maximum tags such that and can be avoided collision within a given multiple interrogation ranges reader has received great deal attention in Radio frequency identification (RFID) systems. Many methods have been proposed for RFID systems tags. However, most previous works often require lots or exist reader-tag collisions. In this paper, we propose new algorithm, called Dynamic-Range-based algorithm (DRBA), maximize number avoid collisions...

Recently, the major challenge in design of wireless sensor networks is to enhance network lifetime. Many researchers have studied problem constructing virtual backbones, which are backbones used for different time periods, order prolong In this paper, we study dual-radio maximize lifetime, where each equipped with two radio interfaces, including small-range and large-range radio. addition, backbone nodes can use or maintain backbone, remaining connect transmit sensed data. Simulation results...

In wireless sensor networks (WSNs), especially in underwater networks, the problem of reporting data to sink with minimum latency has been widely discussed many research works. Many studies address using aggregation report same type without collision a short period time. However, due rapid development technology recent years, is allowed have multiple sensing capabilities, that is, it can generate and collect different types data. Because meanings required functions, only belong are be...

In wireless sensor networks (WSNs), the problem of reporting data to sink with minimum latency has been widely discussed in many research works. Many studies address on using aggregation report same type without collision a short period time. However, due rapid development technology recent years, is allowed have multiple sensing capabilities, that is, it can generate and collect different types data. Because meanings required functions, only belong are be aggregated. addition, interference...

Wireless sensor networks have often been used to monitor environmental conditions, such as temperature, sound, and pressure. Because the sensors are expected work on batteries for a long time without charging their batteries, major challenge in design of wireless is enhance network lifetime. Recently, many researchers studied problem constructing virtual backbones, which backbones different periods, prolong In this paper, we study dual-radio maximize lifetime, called Maximum Lifetime...

Because of the limited energies sensors, efficient data gathering in wireless sensor network has been received a great deal attention recently. To prolong lifetime, this paper, we study problem scheduling mobile sink to some specific nodes, termed anchor nodes for collection and reducing energy consumption transmission. While considering aggregation imbalance initial method, Heuristic Algorithm, is proposed lifetime networks. In addition, simulation conducted evaluate performance method....

Recently, many researchers have studied efficiently gathering data in wireless sensor networks to minimize the total energy consumption when a fixed number of are allowed be aggregated into one packet. However, minimizing does not imply network lifetime is maximized. In this paper, we study problem scheduling aggregation trees working for different time periods maximize addition, propose heuristic balance nodes such that Simulation results show proposed provides good performance.

Nowadays, the problem of using minimum number time slots for data aggregation such that sensors can work without collision transmissions has received a great deal attention in Wireless Sensor Network (WRSN). It is worth mentioning there exists many approaches are tried to reduce WSNs. However, most previous works fallen into reducing certain circle. In this paper, we investigate Reducing Data Aggregation Time Collision (RDATDC) and first propose new overlap circle technique, which termed...

Because of the wide range applications, many geographic routing protocols have been proposed in three-dimensional 3D wireless sensor networks. However, all methods require assistance from a global positioning system GPS, which is not always available. In this paper, we propose method constructing an axis-based virtual coordinate assignment networks ABVCap_3D that requires no GPS assistance. We also protocol based on ABVCap_3D, guarantees packet delivery Using simulations, evaluate...