A. the application layer upward and network layer downward.

A.     Perception Layer:

Perception layer also referred as a “Device layer” in IoT. It contains the physical objects and sensor devices such as RFID, camera, Bluetooth etc. mainly based on object detection method. This layer detects, collects and process information and transmits it to the network layer. The transmitted information may vary due to the different type of sensor. It can be about location, temperature, motion etc. {8}

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B.     Network Layer:

The main purpose of the network layer is to transmit the information due to that we can call it “Transmission Layer”. It securely transfers the information from sensors to different IoT hubs or devices over the internet. The transmission medium can be wired or wireless. Internet gateways, routing devices etc. perform the transmission by using the modern technology such as WIFI, 3G, LTE etc. depending on the sensor. {8 + 4}

C.    Application Layer:

The application layer provides the security that means authenticity, integrity, and confidentiality of the data. In this layer, the main purpose of IoT which is the establishment of a smart environment is achieved. {4}

Except those three commonly used architecture, some researcher declared that in IoT architecture some other layer also exists. Such as, M. Wu et al. defined two more layers in IoT architecture one is Middleware layer and another one is business layer 15. The function of middleware layer is to receive information from network layer and store them in the database. Correspondingly, the business layer has the responsibility for the whole IoT system including application and services. Hui Suo et al. describes one extra layer Support layer with the three general layers. Support layer work as a support platform for the application layer. Here all kind of computing power is organized through network grid and cloud computing. It combines the application layer upward and network layer downward.