Background and challenges Development of minimum cost forwarding (MCF) and source routing MCF routing protocols over 6TiSCH in OpenWSN Fardin Derogarian1, Gordana Gardasevic2, Fernando J. Velez3 1,2Instituto de Telecomunicacoes e DEM, Universidade da Beira Interior, Portugal 3University of Banja Luka, Bosnia and Herzegovina Background and challenges Source Routing for Minimum Cost Forwarding (SRMCF) is a reactive, energy efficient routing protocol which is proposed to improve the existent Minimum-Cost Forwarding (MCF) methods, utilized in heterogeneous Wireless Sensor Network (WSN). SRMCF stems from SR concepts and MCF methods exploited in ad hoc WSNs, where all unicast communications (between sensor nodes and the base node, or vice versa) establish over minimum cost paths. Optimization of routing operation in both directions makes proposed protocol suitable for low-power wireless Internet of Things (IoT) applications. We have developed and evaluated SRMCF and MCF protocols on IEEE 802.15.4 with Brackley MAC (B-MAC) and ContikiMAC. Both of these Media Access Control (MAC) protocols are based on Carrier Sense Multiple Access (CSMA) scheme. Collisions due to concurrent transmission or hidden node problem, decrease the total network throughput and waste energy as well. A scheduled MAC protocol such as IPv6 over the TSCH mode of IEEE 802.15.4e (6TiSCH) is able to provide better performance. In this research the idea is to develop MCF and SRMCF routing protocols over 6TiSCH in OpenWSN. . Description and main innovation Possible sub-sub-title SRMCF is a reactive routing protocol. In this protocol, Sensor Nodes (SNs) use the minimum cost forwarding method as the routing algorithm for sending acquired data to the Base Node (BN). Communication from the BN to a specific sensor over a minimum cost path typically requires intermediate nodes to have stored information about minimum cost routing paths. SRMCF Throughput Each node generates packets at a rate of 2kbps SRMCF presents in average a 33% higher throughput than MCF Life time Routing operation of SRMCF. 50 nodes TelosB with ContikiMAC and Micaz with B-MAC SRMCF shows 10.6% additional lifetime Networks with different arrangement of TelosB motes for experimental evaluation Achievements SRMCF and MCF protocols have been developed and evaluated on IEEE 802.15.4 with B-MAC and ContikiMAC (in OMNet++ and Contiki). The development of the routing protocols over the TSCH mode of IEEE 802.15.4e (6TiSCH) in OpenWSN is in progress. Based on experimental and simulation results, bidirectional minimum cost forwarding, failure recovery mechanism, absence of equal cost paths problem and improved performance make SRMCF a good candidate for WSN and IoT applications. www.portointeractivecenter.org