A New Objective Function Based on Additive Combination of Node and Link Metrics as a Mechanism Path Selection for RPL Protocol

Abstract

Since its development by IETF, the IPv6 routing protocol for low power and lossy networks (RPL) remains the subject of several researches. RPL is based on objective function as a mechanism selection of paths in the network. However, the default objective functions standardized selects the routes according to a single routing metric that leads to an unoptimized path selection and a lot of parent changes. Thus, we propose in this paper weighted combined metrics objective function (WCM-OF) and non-weighted combined metrics objective function (NWCM-OF) that are based both on additive link quality and energy metrics with equal weights or not to achieve a tradeoff between reliability and saved energy levels. The proposed objective functions were implemented in the core of Contiki operating system and evaluated with Cooja emulator. Results show that the proposed objective functions improved the network performances compared to default objective functions.

Weighted Sum Metrics – Based Load Balancing RPL Objective Function for IoT

“…and alleviate the parent switching. Hence, for the preferred candidate parent set, we use the same CNC metric for the child count metric value in our proposed Equation (5). Sometimes the total number of nodes can be obtained using Equation ( 7) if needed.…”

“…Although the RPL has been prominently used for low-density traffic in data sensing regions, this juncture of end-point nodes generates high data transmission, and the root may cause overload. Therefore, high-traffic, overloaded, or unbalanced nodes and the choice of routing metrics and parent selection techniques in RPL alleviate the routing performance [5].…”