A WSN data retransmission mechanism based on network coding and cooperative relayers

Abstract

The use of cooperative diversity techniques and network coding concepts are promising solutions to improve the communication reliability in industrial Wireless Sensor Networks (WSNs). In this paper, we propose the NetCoDer scheme to address this problem, whose design is based in these concepts. The effectiveness of the NetCoDer scheme is evaluated through both an experimental setup with real WSN nodes and a simulation assessment, comparing its performance against stateof-the-art TDMA-based retransmission techniques.

Experimental assessment of using network coding and cooperative diversity techniques in IEEE 802.15.4 wireless sensor networks

“…That is, the purpose is to select how many and which nodes can be used in cooperation to increase the success rate in delivering messages. Additionally, we extend the assessment presented in [5], by performing an experimental assessment with the injection of controlled EMI noise in an anechoic chamber.…”

“…In this case, one of the solutions adopted in the literature is linear network coding (LNC) [4], [5], which assumes that all messages can be considered vectors of elements of a finite field F q (m i = [m i1 . .…”

“…The use of different retransmission techniques within the context of WSNs was discussed in [7]. More specifically, and considering LNC techniques, in [5] was proposed a retransmission mechanism based on LNC and cooperative diversity that increases the success rate of the transmission of messages in noisy communication environments. As the scope was slotted communication, the adopted mechanism was TDMA-based.…”

“…In [8] it was also used a TDMA-based approach in links subject to losses, with relay nodes assisting other nodes in order to minimize deadline misses, and focusing on when and how the transmission slots are used. In this paper, the used LNC approach is similar to these two techniques [5], [8]. That is, the purpose is to select how many and which nodes can be used in cooperation to increase the success rate in delivering messages.…”

“…The coordinator includes the information about the set of relay nodes in the payload of beacon messages (line 4). 1 for ever do 2 Coordinator determines the number of relays based on the PER, 3 Determines the set of relays based on the RSSI of each node and 4 Transmits these information into the beacon payload 5 foreach node in the network do 6 Receives the beacon information 7 Waits its reserved slot and transmits its message Relay nodes overhear messages from the neighborhood and are able to transmit messages in two distinct opportunities. The first transmission occurs within its reserved slot (line 7).…”