IFAC-PapersOnLine 49-30 (2016) 102–107 ScienceDirect Available online at www.sciencedirect.com 2405-8963 © 2016, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved. Peer review under responsibility of International Federation of Automatic Control. 10.1016/j.ifacol.2016.11.136 © 2016, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved. Keywords: Internet of Things, wireless sensor networks, Medium Access Control 1. INTRODUCTION The Internet of Things enables applications in different scenarios such as urban applications in healthcare, transport, industrial automation among others. Sensor nodes that are limited for power, memory and computation form an IoT network. The physical medium needs to be controlled to minimize the losses (Palattella et. al., 2013). Regarding the wireless sensor network (WSN) technology, based on IEEE802.15.4 standard, several papers have been proposed to meet the different scenarios and requirements proposed by IoT. Institutions work in protocols solutions to meet these different scenarios. For IoT applications in WSN, the IETF has led major efforts in the network standardization as the 6LoWPAN, RPL and COAP. The OpenWSN group of Berkeley University has developed a platform to provide an open-source implementation environment according to current standards for a complete solution of IoT (Palattella et.al., 2013). Regarding communication protocols, the OpenWSN is based on synchronous media access protocols which are not feasible when there is a network with a large number of sensor nodes (Cano et.al., 2011),(Dutta,et.al, 2012). This paper proposes to analyse asynchronous MAC protocols using OpenWSN environment. We also present a multi- channel asynchronous medium access mechanism for urban networks applications called RIT multi-channel (RITMC). Therefore, this paper is organized as follows: In chapter 2, is shown the major components of an IoT network and the technologies involved in wireless sensor networks. Chapter 3 details the proposed multi-channel asynchronous mechanism. Chapter 4 shows the current results of the work and finally in chapter 5 there is the conclusion 2. IOT NETWORK COMPONENTS The IoT networks can be divided into four main levels: sensors, network, services and interface. The figure 1 shows an example of this architecture (Li,Xu and Zhao, 2015). Fig.1. Typical Architecture of IoT System Within these various communication levels there are standard protocols in order to make easier the interconnection between modules and equipment in a standardized manner. Various efforts of groups such as IEEE and IETF have been done to create standards at different communication levels of IoT. In Table 1 can be seen the protocols used in IoT, more specifically for wireless sensor network (WSN). Some of these protocols are well defined and widely used. Still others have disabilities, and some are still in the definition phase (Pallatella, et.al., 2013). Abstract: In the scenario of IoT for urban networks, network technologies depends on the application requirements such as reliability, delivery rate, safety, consumption, and others. Among the protocols existing for media access in WSN, the asynchronous methods allow for greater scalability and simple implementation. The OpenWSN group from Berkeley University build an IoT development platform under the most IoT networks standards. However, it uses synchronous mechanisms for media access. Therefore, this paper proposes an asynchronous multichannel MAC protocol based in RIT mechanism using OpenWSN platform for use in applications with low power consumption and high scalability requirements. *Universidade Federal de Uberlândia, Uberlândia, Brasil; e-mail: rffernandes@eletrica.ufu.br). ** Universidade de São Paulo, São Carlos, Brazil; e-mail: dennis@sc.usp.br) Renato F. Fernandes Jr. *, Dennis Brandão** Proposal of Receiver Initiated MAC Protocol for WSN in urban environment using IoT