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This article shares with you what is not included in the three-tier structure type of Internet of Things in computer networks. Xiaobian thinks it is quite practical, so share it with everyone for reference. Let's follow Xiaobian and have a look.

The three-tier IoT does not include a "session layer." Although there is no global unified specification on IoT architecture, most of the current literature divides IoT architecture into three layers, namely perception layer, network layer and application layer.

Operating environment: Windows 7, Dell G3 PC.

The three-tier IoT does not include a "session layer."

Although the structure of the Internet of Things system is complex, and the functions and scales of different Internet of Things application systems are very different, they must have many inherent common characteristics. Drawing on the research methods of mature computer network architecture models, the Internet of Things is divided into perception layer, network layer and application layer.

1. Perception Layer

Perceptual layer or perceptual execution layer is the foundation of Internet of Things and the link between physical world and virtual information world.

Classification of perceptual layer devices:

Automatic sensing equipment: equipment capable of automatically sensing external physical objects and physical environment information, including RFID, sensors, GPS, intelligent household appliances, intelligent measurement and control equipment.

Artificial information devices: intelligent electronic devices that artificially generate information, including smart phones, personal digital assistants (PDAs), computers, which are auxiliary means of automatic perception.

The important difference between the perception layer and the perception execution layer lies in whether intelligent objects need to have both perception ability and control and execution ability, and what kind of control and execution ability they need.

Discussion of Perceptual Layer Technology Development:

At present, the discussion is mainly about large-scale and low-cost RFID tags, various sensor applications, in the first stage of the Internet of Things is very natural and necessary, just like the expansion of the interface, to build and correspond to the physical world of information world, the first thing to do is to expand the information world nodes, and then nodes and intelligent objects in the physical world one-to-one correspondence. After that, the perception of a single sensor will gradually move towards the direction of identity perception, state perception, position perception, process perception and environment perception.

The development of new sensors depends on new materials, new mechanisms, new processes, which are the driving forces for the development of new technologies. It has a subversive effect at any time.

The emergence of wireless sensor and actuator networks marks the development trend of intelligent robots and wearable computing devices as a combination of "sensors and actuators," making the Internet of Things have stronger comprehensive sensing capabilities, adaptive, collaborative and intelligent processing capabilities.

2. Internet of Things Network Layer-a layer closely integrated with computer network knowledge

1. Understanding the Access Layer, Aggregation Layer, and Core Switching Layer:

(1) Basic methods for network hierarchy model and architecture research

There are two basic ways to discuss hierarchical models of computer networks.

Computer networks are divided into seven layers from physical layer to application layer using the Open Systems Interconnection (OSI) reference model.

The part that provides data transmission service for application layer computer process communication is called "transmission network" or "bearer network," then the interconnected wide area network, metropolitan area network, local area network and personal area network, as well as the mobile communication network and telephone switching network of telecommunications all belong to the category of transmission network.

The first method is suitable for the study of network theory and layered protocols. The second method is suitable for the research of network application system design and implementation. The focus of the Internet of Things should be on network applications, and the second abstract method is more suitable.

2. Basic concepts of application system architecture:

At the beginning of the study of Internet hierarchy model, the Internet structure is very complex. After a lot of practical and theoretical research, researchers followed the "top-down" design method and put forward the concept of Application Architecture. That is to say, a large-scale Internet application system is divided into two parts: network application and transmission network. The part of the network that provides data transfer services for process communication among interconnected computers is called a "transport network."

According to this idea, when designing a large-scale Internet application system, the designer will focus on the application layer function planning, working model and protocol design, and computing model and application software development in the first step; the second step is to select the appropriate transmission network technology and network structure according to the application system's requirements for data transmission quality of service. "Divide and rule" complex problems. "First determine the application, then select the transmission network"

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