Publication Date:
2014-08-10
Description:
Collecting sensor data in industrial environments from up to some tenth of battery-powered sensornodes with sampling rates up to 100 Hz requires energy-aware protocols, which avoid collisionsand long listening phases. The IEEE 802.15.4 standard focuses on energy-aware wireless sensornetworks (WSNs) and the Task Group 4e has published an amendment to fulfill up to 100 sensorvalue transmissions per second per sensor node (low latency deterministic network (LLDN) mode)to satisfy demands of factory automation. To improve the reliability of the data collection in the startopology of the LLDN mode, we propose a relay strategy, which can be performed within the LLDNschedule. Furthermore, we propose an extension of the star topology to collect data from two-hopsensor nodes. The proposed retransmission mode enables power savings in the sensor node of morethan 33%, while reducing the packet loss by up to 40%. To reach this performance, an optimumspatial distribution is necessary, which is discussed in detail.
Print ISSN:
1687-1472
Electronic ISSN:
1687-1499
Topics:
Electrical Engineering, Measurement and Control Technology
,
Computer Science
