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Collecting sensor data in industrial environments from up to some tenth ofbattery powered sensor nodes with sampling rates up to 100Hz requires energyaware protocols, which avoid collisions and long listening phases. The IEEE802.15.4 standard focuses on energy aware wireless sensor networks (WSNs) andthe Task Group 4e has published an amendment to fulfill up to 100 sensor valuetransmissions per second per sensor node (Low Latency Deterministic Network(LLDN) mode) to satisfy demands of factory automation. To improve thereliability of the data collection in the star topology of the LLDN mode, wepropose a relay strategy, which can be performed within the LLDN schedule.Furthermore we propose an extension of the star topology to collect data fromtwo-hop sensor nodes. The proposed Retransmission Mode enables power savings inthe sensor node of more than 33%, while reducing the packet loss by up to 50%.To reach this performance, an optimum spatial distribution is necessary, whichis discussed in detail.

Energy Efficient and Reliable Wireless Sensor Networks - An Extension to IEEE 802.15.4e