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Open AccessArticle

Sigma Routing Metric for RPL Protocol

Departamento de Ingeniería de Sistemas, Universidad Simón Bolívar, Barranquilla 080001, Colombia
Departamento de Ingeniería de Sistemas, Universidad del Norte, Barranquilla 080001, Colombia
Author to whom correspondence should be addressed.
Sensors 2018, 18(4), 1277;
Received: 3 March 2018 / Revised: 16 April 2018 / Accepted: 17 April 2018 / Published: 21 April 2018
This paper presents the adaptation of a specific metric for the RPL protocol in the objective function MRHOF. Among the functions standardized by IETF, we find OF0, which is based on the minimum hop count, as well as MRHOF, which is based on the Expected Transmission Count (ETX). However, when the network becomes denser or the number of nodes increases, both OF0 and MRHOF introduce long hops, which can generate a bottleneck that restricts the network. The adaptation is proposed to optimize both OFs through a new routing metric. To solve the above problem, the metrics of the minimum number of hops and the ETX are combined by designing a new routing metric called SIGMA-ETX, in which the best route is calculated using the standard deviation of ETX values between each node, as opposed to working with the ETX average along the route. This method ensures a better routing performance in dense sensor networks. The simulations are done through the Cooja simulator, based on the Contiki operating system. The simulations showed that the proposed optimization outperforms at a high margin in both OF0 and MRHOF, in terms of network latency, packet delivery ratio, lifetime, and power consumption. View Full-Text
Keywords: LLN; RPL; objective function; routing metric LLN; RPL; objective function; routing metric
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Sanmartin, P.; Rojas, A.; Fernandez, L.; Avila, K.; Jabba, D.; Valle, S. Sigma Routing Metric for RPL Protocol. Sensors 2018, 18, 1277.

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