INVESTIGATION OF WSN PARAMETERS FOR REALIZATION OF QUALITY OF SERVICE

摘要

In this paper, emphasizing on the Quality of Service (QoS), the parameters of the industrial Wireless Sensor Network have been investigated. Deploying an ubiquitous embedded technology, the smart sensor motes have been designed in which the standards of IEEE 1451 are realized. According to these standards, the Network Capable Application Processor (NCAP) plays a vital role on establishment of wireless communication, along with transduction and intelligent computing. The ZigBee device has been used to facilitate the sensor motes with smart communication module. The ZigBee devices are operating according to IEEE 802.15.4 with amended PHY and MAC layers. Thus, the sensor motes have been designed, wherein two standards IEEE 1451 and IEEE 802.15.4 are suitably confluenced. The base station, which is inherent part of WSN, is developed and utilized for the establishment of WSN in desired protocol. The parameters, such as Receiver Signal Strength Indicator (RSSI), Link Quality Indicator (LQI), Packet Reception Rate (PRR), Delay Time (DT) etc, being QoS parameters of the dedicated WSN are investigated for both indoor as well as outdoor environment. It was found that, the values of RSSI and LQI are measured for both indoor as well as outdoor environment, which are in the limit of agreement. Both RSSI and LQI decrease with increase in distance of mote from base station. The packet reception rate is estimated from the rate of packets stored in the data base. PRR is within the range from 96% to 100%, which suggest that the data loss is less than 4%. The latency expressed by measuring delay time is also very less. It was found that, the values of these QoS parameters are mostly sensitive to the infrastructural obstacles. From results of investigation, the WSN provides good QoS and hence ensure its suitability of industrial deployment.