Wireless Sensor Networks

Abstract

Wireless sensor networks constitute the platform of a broad range of applications related to national security, surveillance, military, health care, and environmental monitoring. The coverage problem for Wireless Sensor Network (WSN) has been studied extensively in recent years, especially when combined with connectivity and energy efficiency. This paper focuses on the sensor replacement problem in wireless sensor networks consists of mobile sensors. Mobility equipped sensors are utilized to recover and maintain the overall coverage using the dynamic cluster concept. The proposed fault repair solution does not assume the localization information is available. Mobile sensor nodes make use of simple geometric operation to locate and replace dying nodes to recover or increase the existing coverage and connectivity.

Information-Importance Based Communication for Large-Scale WSN Data Processing

“…We have limited the radio range and the data rate of each node to 87 meters and 1Mbps respectively as suggested in [13]. The size of sensed data is 24 byte per node and the sensed data interval is 10 seconds.…”

“…In order to compute the amount of energy consumed in communication, we use the equation (1) defined in [13]. E T X is the power consumed during transmission and E RX is the power consumed during the reception.…”

“…Typical values of e 1 and e 2 are 10pJ/bit.m 2 and 0.0013pJ/bit.m 4 respectively. -The energy consumed by the CPU: to compute this energy, authors in [13] have defined a rule based on the number of instructions and the frequency of the processor. In IIBC, we use the processor defined in the sun spot technical document [14], which defines the processor frequency of their sensor nodes to 180 Mhz.…”

“…In IIBC, we use the processor defined in the sun spot technical document [14], which defines the processor frequency of their sensor nodes to 180 Mhz. According to [13], a processor with such frequency consumes approximately 0.8 nJ per instruction. For this parameter, we would like to underline that for the C/S approach the power consumption of the CPU is neglected as the information processing occurred in the sink and not in the sensor node; -The consumption of the sensing action: we neglected this consumption as it is supposed to be the same for IIBC and C/S approach.…”

Strategies in the Design of Low Power Wireless Sensor Network for the Measurement and Monitoring of Physiological Parameters

“…The basic task here is to convert a bit stream coming from a processor or microcontroller and convert them to and from radio waves [6].Now a days a single device is used that combines both these the two tasks in a single entity. Such combined devices are called transceivers.…”