In current Internet, data owners can provide integrity and authentication when data is generated. However confidentiality is usually implemented by symmetric keys between two corresponding programs in an end-to-end manner. A symmetric key for confidentiality is not suitable for Internet of Things (IoT) environment where there are one producer of data and multiple consumers of data.

The possibility of smoothing aggregated traffic from sensors with varying reporting periods and frame sizes to be carried on an access link is investigated. A straightforward optimization would take O(pn) time, whereas our heuristic scheme takes O(np) time where n, p denote the number of sensors and size of periods, respectively. Our heuristic scheme performs local optimization sensor by sensor, starting with the smallest to largest periods. This is based on an observation that sensors with large offsets have more choices in offsets to avoid traffic peaks than the sensors with smaller periods. A MATLAB simulation shows that our scheme excels the known scheme by M. Grenier et al. in a similar situation (aggregating periodic traffic in a controller area network) for almost all possible permutations. The performance of our scheme is very close to the straightforward optimization, which compares all possible permutations. We expect that our scheme would greatly contribute in smoothing the traffic from an ever-increasing number of IoT sensors to the gateway, reducing the burden on the access link to the Internet.

In vehicle, there are many ECU (Electronic Control Unit)s, and ECUs are connected to networks such as CAN(Controller Area Network), LIN(Local Interconnect Network), FlexRay, and so on. The CAN is the most used technology in automotive network. If the 3GPP technology is used for the purpose of V2I (Vehicle to Infrastructure) in automotive network, it would need an Inter-connection of CAN network and 3GPP to deliver messages. In this paper, we propose the software architecture and functions of CAN over 3GPP gateway to transfer an In-vehicle logging message, automotive diagnostic status or safety-related information, etc to user or server in the internet.