[Import] IPv6 + Ad-hoc! = WSN

First of all, it should be declared that the WSN is a Wireless Sensor Network, rather than a hacker.

In the past few years, it seems like a fire in WSN. I don't know when to start. My instinct for the WSN is IPv6 and Ad-hoc. So I don't have a cold feeling about it either. I think it may be a new concept.

Today, I don't know why. Starting from the Google academic search news launched by Google in China, I searched and transferred it to the keyword "wireless sensor network, I also learned this and corrected my understanding.

"At the early stage of wireless sensor networks research, the Key Laboratory of computer networks in Shandong Province, people thought that mature Internet technologies and Ad-hoc Routing mechanisms were sufficient for the design of sensor networks, however, in-depth research shows that sensor networks have different technical requirements from traditional networks. The former is centered on data, and the latter is aimed at data transmission. In order to adapt to a wide range of applications, the traditional network design follows the "End-to-End" edge theory, emphasizing that all functional-related processing is placed on the network end system, an intermediate node is only responsible for data group forwarding. This is not a reasonable choice for sensor networks. Some protocols and algorithms designed for self-organizing Ad-hoc networks may not be suitable for the characteristics and application requirements of sensor networks. Node Identifiers (such as addresses) are not very important in sensor networks because applications do not care much about the information on individual nodes; data Processing, fusion, and caching related to specific applications on intermediate nodes are also necessary."

Cui Li, a Director of the Institute of Computing Technology of the Chinese Emy of Sciences, said that the sensor network cannot simply use the protocol of the previous (so-called "traditional") ad-hoc network. The reason is as follows:
1. The number and distribution density of nodes in the sensor network far exceed the number of nodes in the ad-hoc network;
2. Most nodes do not move as fast as ad-hoc nodes;
3. sensor nodes are more likely to fail than ad hoc networks;
4. The storage, computing, and power of sensor nodes are limited;
5. sensor nodes primarily use broadcast communication, while ad hoc networks mostly use point-to-point communication;
6. Due to the large number of sensor nodes, the sensor nodes do not necessarily have the world's unique identifier;

The above two incisive summary can explain why IPv6 + Ad-hoc! = WSN. So what are the research hotspots and Key Technologies of sensor networks?

Currently, sensor networks are generally abstracted into five layers based on their functions, including the basic layer (sensor set), network layer (Communication Network), middleware layer, data processing and management layer, and application development layer.

The base layer focuses on the study of new sensors and sensing systems, including the application of new sensing principles, the use of new materials, and the adoption of new structural design, ability to reduce energy consumption, increase sensitivity, selectivity, response speed, dynamic range, accuracy, stability, and work in harsh environments. It also includes system integration of multi-channel sensors, wireless communication chips, and embedded processors. In addition, it also includes the study of embedded operating systems to achieve efficient event processing, energy management, command processing and work description for the overall system using effective resources. In addition, the Design of sensor nodes with ultra-low energy consumption, the interface of each functional component and the system integration method, and the implementation of high-speed communication with the signal processing center to ensure rapid and timely response by decision makers are also the focus of the research.. At present, most of the generation of node products use various general chips (such as ordinary eight-bit microprocessor, such as Atmega128L, and general wireless communication module CC1000) and components for integrated development. Some next-generation Nodes Facing the 2010 s will completely adopt the SOC method to achieve real miniaturization and greatly reduce node costs. Representative projects in this regard include the well-known Smart Dust.

The network layer uses communication networks as the core to implement communication between sensors and users, effectively controls and manages sensor nodes, and supports multi-sensor collaboration to complete large-scale sensing tasks. Research work should be carried out, including low energy consumption, high speed, long life cycle wireless sensor network random self-organizing communication protocol, communication mode and self-reconstruction, self-adjustment; the scalability, fault tolerance, maintainability, security, and privacy of wireless sensor networks; the characteristics of sensor networks (different from existing Internet and Ad hoc wireless networks ); it is applicable to the network communication mode of sensor networks, various protocols supporting sensor network communication, time synchronization, task allocation and coordination control, and corresponding hardware and software resources.

The middleware layer researches the standard middle layer software structure with general performance, and is responsible for resource management, dynamic environment analysis of sensor network systems, and development support for universal applications, such as application function change, function expansion, system upgrade, reuse, and other key performance implementations. The data processing and management layer focuses on sensor data management and processing software, including data-centric Real-Time Distributed Data Stream Management, query, and related information processing technologies; supports various data management and analysis and processing software systems for data collection, storage, query, and analysis, new Statistical algorithms, methods for eliminating error information, collaborative processing for large-scale distributed sensor arrays, and image recognition methods.
The application development layer consists of various sensor network applications.

Obviously, the research on sensor nodes on the basic layer is the starting point and foundation of the overall sensor network research. The technologies involved in the above mentioned network nodes are undoubtedly part of the most critical sensor network technology. In addition, it is extremely important and urgent to study the key technologies of network protocols that are suitable for sensor network characteristics and support the work of sensor networks. The Research on this Protocol focuses on the network layer and the MAC (Media Access Control) layer.

The text of the above introduction to sensor networks is excerpted from the Information Network Office of the institute of computing technology, Chinese Emy of sciences, entitled "sensor network" (Cui Li, Hai Ling, Li tianpu po ), this article also introduces the sensor network protocol. Based on the latest developments in this area, refer to another article entitled "wireless sensor network research progress" (published in computer Research and Development 2005-1)

Finally, the true mood for writing this Blog is: I think this is a good research field. The key is that it can be combined with my own knowledge background, in addition, it is still in the examination stage in the near future, so there is no time to do more in-depth exploration.

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