In low -power wireless communication technology, WMN (Wireless Mesh Network) and Bluetooth technology are two different technologies, each with its advantages and disadvantages in specific scenarios. Which technology to choose depends on the specific application needs, such as the communication range, the number of equipment, the energy consumption requirements, and the data transmission rate.

Overview of wireless network

The characteristics of wireless network -shaped network
Wireless mesh network (WMN) appeared in the mid -1990s, and began to attract people's attention after 2000.
In the early 2000, wireless mesh technology began to be valued, and several important events occurred. The US ITT company transferred part of the patent of the US military's tactical mobile communication system to MESH, which subsequently launched a civilian wireless multi -jump self -forming product. At the same time, wireless mesh products jointly developed by NOKIA, Nortel Network, Tropos, Skypilot, Radiant and other companies have also came out. In 2005, Motorola acquired Mesh. In addition, in the research process of IEEE 802.16 wireless city network standards, IEEE 802.16A increased support for wireless mesh structures.

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IEEE 802.16 and IEEE 802.16A were renamed IEEE 802.16D after being revised, and they were officially released in May 2004. At the end of 2004, Nortel Network set up a large wireless mesh system in a certain city in my country to expand the coverage of wireless LAN and provide broadband wireless access services.

Wireless mesh network is a network based on multi -jumped routing, peer structure, and large -capacity. It can dynamically expand and has the characteristics of self -forming, self -configuration, and self -repair. It is closely integrated with AD HOC and WMN technology, and is coexisting, combined and supplemented by network technologies such as mature WLAN, Wireless Broadband access network (WBAN). Wireless mesh network supports distributed control, as well as wireless communication services such as Web, VOIP and multimedia. As a supplement to the technology of wireless LAN and wireless city network, it has become a new plan to solve the problem of wireless access to the "last kilometer" problem. The difference is as follows:

The difference between wireless mesh network and wireless self -self -forming network
Wireless mesh network and wireless self -forming network have similar network structures, and both use point -to -point self -organized multi -jump network structures. But their nodes have different functions and topology. Wireless self -networking nodes have the functions of hosting and routes. They are connected in an equal cooperation, emphasizing the movement of nodes and the rapid changes in network topology. The main function is to transmit data between a pair of nodes. The wireless mesh net constitutes a wireless backbone network by wireless routers. It provides a large -scale signal coverage to connect to nodes. It focuses on "wireless". Most nodes are still. Access to the Internet. Wireless self -forming networks focus on "moving", mainly used for flexible and random communication.

The difference between wireless mesh network and wireless local area network
From the perspective of network topology structure, wireless mesh network is a self -organized multi -jump network structure of point -to -point (P2P), while wireless LAN is a single -jump method for multi -point (P2MP). ) Network structure. Wireless LAN provides high -speed data transmission services of 11 ~ 54Mbit/s in a relatively small range. The distance from typical nodes to the service reception point is within hundreds of meters, while wireless mesh nets use wireless routers to form backbone networks. The access distance expands to a range of several kilometers.

From the perspective of the network protocol, the wireless mesh network has a lot of common things with the wireless LAN, but the wireless network network needs to complete the data forwarding function of other nodes, and the wireless LAN mainly completes the local access business. Therefore, the wireless local area network adopts the combination of static route protocols and mobile network protocols, while wireless mesh networks mainly use short -lived dynamic dynamic routing protocols.

The difference between wireless network network and wireless city area network
The difference between wireless mesh network and wireless urban area network is structure, reliability and cost. The wireless city area network adopts a star structure. Once a communication channel fails, it may cause a large -scale communication interruption. The wireless mesh network adopts a mesh structure. A communication channel failure will automatically turn to other channels. Therefore, wireless mesh -shaped shape The net has strong ability. In addition, the investment cost of wireless city area network is large, and the price of networking equipment for wireless mesh networks is low, the cost of networking and maintenance is low, and the network is flexible, low in cost, convenient maintenance, large coverage, and relatively small construction risks The advantages.

Wireless network network structure

Wireless mesh network is a network structure based on wireless self -self -forming technology. It is combined with wireless LAN and wireless city network technology to meet different application needs. In different application scenarios, it presents different network structures.
(1) Graphic network structure
The graphic network structure is a simple wireless network structure. All of the nodes use point -to -point structures to perform the same Mac, routing, network management and security protocol. The role of this structure is the same as the nodes of wireless self -self -forming. In fact, the wireless mesh network of the graphic network structure can be regarded as ordinary wireless self -forming network.
(2) Multi -level network structure
In the multi -level network structure, the hardware of the lower network is usually composed of terminal devices. These devices can be ordinary VOIP mobile phones, laptop computers with wireless communication functions, and wireless PDA. The upper layer consists of a wireless router (WR) to form a wireless communication environment and access the Internet through the gateway. The terminal device of the lower layer is connected to the wireless router. The wireless router passes the route protocol and the management control function to choose the best path for communication between the lower terminal equipment. The lower terminal equipment usually does not have communication functions.
In the case of large coverage and long distance, wireless urban area network technology is usually adopted. This technology has the advantages of long -distance transmission and high bandwidth. Within 50km, it can provide a transmission rate of up to 70Mbit/s. The wireless self -self -consisting transmission platform composed of wireless mesh networks consisting of wireless mesh networks. The bottom layer adopts a wireless mesh structure with a flat network structure. Access of VOIP mobile phone, laptop computer, wireless PDA and other devices. This structure can extend the coverage of the wireless LAN and provide wireless broadband access within a more convenient and flexible urban area.

Overview of Bluetooth Technology

Features of Bluetooth technology

Bluetooth technology is a wireless communication technology that supports device in short -range communication. It can exchange wireless information between mobile phones, PDA, wireless headphones, laptops and other related external devices. It adopts decentralized network structure and fast frequency jump and short -group technology. Double transmission. Bluetooth technology is an open, short -distance wireless communication standard, which can be used to replace the current multiple cable connection solutions within a shorter distance to achieve convenient, flexible and safe, low -cost, small power -consuming voice and data communication.

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Short-range wireless communication - Wi-Fi wireless technology

Bluetooth products use low energy -consuming radio communication technology for voice, data and video transmission, and the transmission rate can reach up to 1Mbit/s. It adopts the time full dual -work communication method, and the communication distance is about 10 meters. It can increase the communication distance by configuring the power amplifier.

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Bluetooth products use frequency jump technology, fast frequency jump and short group technology, front -directional error -correction coding technology, and 2.4GHz ISM frequency bands and frequency adjustment methods to improve the security and reliability of communication, and reduce the same frequency interference and random noise of the same frequency interference and random noise interference. Each Bluetooth voice channel supports 64kbit/s synchronous voice. The maximum rate supported by asynchronous channels is 721kbit/s, the reverse response rate is asymmetric connection of 57.6kbit/s, or a symmetrical connection of 432.6kbit/s. In addition, Bluetooth technology products also support an asynchronous data channel, or three concurrent voice channels, or a channel that conveys asynchronous data and synchronous voice at the same time. The communication between Bluetooth technology products and the Internet enables family and office equipment to achieve interconnection without cables, thereby improving office and communication efficiency.

Bluetooth protocol

The Bluetooth protocol (Refer article:Low-power wireless communication-Bluetooth protocol and Bluetooth module) system is divided into 4 floors according to the special interest group (SIG). Among them, the core protocol includes the baseband (BB) protocol, the link management protocol (LMP), the logical link control adaptation protocol (L2CAP), and the service discovery protocol (SDP). Serial port simulation protocol (RFCOMM), telephone control system (TCS) protocol, selection protocol (including point -to -point (PPP) protocol, Internet protocol (IP), transmission control protocol (TCP), user database protocol (UDP), object exchange (OBEX) Agreement and Wireless Application Agreement (WAP), Electronic Business Card (VCARD) and Electronic Calendar (VCAL) protocols are determined according to the needs of the application. In addition, the specification also defines the host controller interface (HCI) The device, connecting manager, hardware status and control register provide command interface. The core protocol of Bluetooth is composed of SIG -based Bluetooth -specific protocols. Most of the Bluetooth devices require core protocols (plus wireless parts), while other protocols are based on the application of the application. It is necessary to determine. In short, the cable replacement protocol, telephone control system protocol and the adopted protocols constitute an application -oriented protocol based on the core protocol.
Advantages of Bluetooth technology
Bluetooth technology is a low -cost close -range wireless communication technology that is designed to build a personal network so that various devices can achieve seamless resource sharing within close range. Unlike the traditional communication mode, its original intention is to achieve general cable functions at the same cost and security, so that mobile users can get rid of the cable restraint. Bluetooth technology has the following technical characteristics: can transmit voice and data; use frequency bands, connectivity, anti -interference and stability; low cost, low power consumption and low radiation; security; network characteristics.
Application of Bluetooth technology
Bluetooth SIG defines five basic application models, namely file transmission, Internet network bridge, LAN access, three -in -one phone and terminal headsets. These application models play an important role in the application of Bluetooth technology, providing users with a more convenient and efficient experience experience.

From the current field of Bluetooth products, Bluetooth is mainly used in mobile phones, palm computer, headphones, digital cameras, digital cameras, car kits, etc. In addition, the Bluetooth system can also be embedded in traditional household appliances, such as microwave ovens, washing machines, refrigerators, air -conditioning machines, etc. With the continuous maturity of Bluetooth technology, its application has become more and more wide. On the Bluetooth -supported car telephone, major automobile manufacturers have installed the vehicle -free phone call system on the car and work with a mobile phone with Bluetooth function to maintain wireless connections between mobile phones and personal computers.

Automobile rearview mirrors can also use Bluetooth. LG has shown a car rearview mirror that supports Bluetooth. This car rearcot mirror can be connected to the mobile phone through Bluetooth. When calling, the call number will be displayed in the middle of the mirror. Bluetooth technology plays an important role in automotive anti -theft. There are various automotive anti -theft Bluetooth equipment on the market. A British company has launched automotive anti -theft products with Bluetooth technology. According to the introduction, this system named Auto -TXT can treat the user's Bluetooth mobile phone (or other Bluetooth devices) as the second lock of the car. If the Bluetooth mobile phone is not in the car, once the car is started, the system will determine the car theft, which will turn on the alarm device. In terms of building a family network, connecting all information devices inside the family into a network is an inevitable trend of future information society.

Information synchronization is the core application of Bluetooth products, such as synchronization of personal information management, switching business cards between the computer or the computer and the mobile phone, or the exchange of data between the office computer and home computers. It is getting more and more important.