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Botta and Alessio pointed out that in the structure of the Internet of things, the gateway of the Internet of things connects the sensor network and the public transmission network. (Dang, 2017 & Rajesh, Rajamonikala, Thayyil & Mohanan, 2017) For the public network, its development has been relatively perfect. Therefore, the research work mainly concentrates on the effective access to the public network of the Internet of things gateway. Blenk and Andreas investigated the network virtualization management program of the software definition network. (Al-Fuqaha, Guizani, Mohammadi, Aledhari & Ayyash, 2015). Kafle, Fukushima, and Harai (2016) studied Internet of things standardization in ITU and prospective networking technologies, and ITU-T is the research target of the ubiquitous sensor network (USN), which is subordinate to the Internet of things. Li, Chai, Chen and Loo (2016) applied the distributed access control framework to the iPv6 - based layered Internet of things. The SG17 team is mainly engaged in the research of the direction of security and target identification. Liu, Li, Chen, Dong and Jin (2015) pointed out that the SG13 team is responsible for studying the functional requirements of the sensor network and the architecture of ISO/IEC data communication. The technology committee JTC1 SC6 set up the sensing network research group (SGSN) at the end of 2007. Mineraud and Julien (2016) analyzed the gap between the Internet of things platform. At the JTC1 plenary session in October 2009, JTC1 announced the establishment of a Sensor Network Working Group (JTC1 WG7) to standardize sensor networks. In the Technical Document of ISO / IEC JTC1 Study Group on Sensor Networks (SGSN) Study on Sensor Networks (Version 3), JTC1 defines a sensor network gateway reference architecture.
Osseiran and Afif (2017) pointed out that in the aspect of IoT gateway, two problems are mainly studied, which are the hierarchical structure design of IoT gateway and the application of SDN in sensor gateway. Palattella studied the Internet of things in the 5G era, which included the promoters, the architecture and the business model. Sensor gateways and traditional gateways are different (Fang & Wu, 2016). One end of the connection is the sensing network and the other end is connected to the public network. Therefore, its structure is stratified in the design. It is divided into the policy layer and the forwarding layer. Sun, and Ansari (2016) thought that the strategy layer generates and distributes the policy, receives the instruction of the upper-layer gateway, and manages the nodes to match the forwarding rules. Xu, Gao, Dong, Zhang, Foh, and Chao (2017) studied SDN networking in new attacks based on defense. The forwarding layer only forwards the data packet. This control and data flow separation structure can effectively improve the system transmission efficiency. The history and implementation of the SDN network are discussed and its internal structure is analyzed. The flow table mechanism and excellent components in SDN are applied to the sensor gateway.