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The Internet of Things (IoT) is assumed to be an integrated part of Future Internet. IoT can be regarded as an extension of the existing interaction between humans and applications through the new dimension of “Things” communication and integration. IoT networks in the scale of million nodes are possible even today but managing the nodes and information provided by large networks beyond that scale requires architecture scalability that is still an area to explore. The aim of this paper is to present usage scenarios and analyse requirements of a Mobile Cellular Network (MCN) based router for a secure, energy efficient, and scalable wireless network architecture. The network is composed of the MCN based edge routers and large amount of Central Processing Units (CPU), memory, and energy restricted sensor/actuator devices. Mobile routers communicate with application servers in the Internet and surrounding sensor network(s). The analysis of the scenarios highlighted common aspects and led to requirements that were used to define the MCN based router/proxy device and guide the network and system architecture design as well as the development of a prototype.