What are the differences between wireless sensor networks compared to mobile self-organizing networks

Zigbee: a new wireless network data communication technology Zigbee technology is with the industrial automation for wireless communication and data transmission needs and the emergence of Zigbee network power saving, reliable, low cost, large capacity, security, can be widely used in a variety of automation fields. The origin of Zigbee: In the process of using Bluetooth technology, people found that Bluetooth technology, despite its many advantages, still has many defects. For the industrial, home automation control and telemetry telecontrol field, Bluetooth technology seems too complex, power consumption, close distance, networking scale is too small, etc. ...... And the demand for wireless communication in industrial automation is getting stronger and stronger. Therefore, after people's long-term efforts, the Zigbee protocol was adopted in mid-2003 and officially launched in 2004. What is Zigbee: Zigbee is a wireless data transmission network platform consisting of up to 65,000 wireless data transmission modules, very similar to the existing mobile communication CDMA network or GSM network, each Zigbee network data transmission module is similar to a base station of the mobile network, in the entire network range, they can communicate with each other; each network node can range from the standard 75 meters, the distance can range from the standard 75 meters, the distance can range from the standard 75 meters, the distance can range from the standard 75 meters, the distance can range from the standard 75 meters to the standard 75 meters. The distance between each network node can be from the standard 75 meters, to the extended hundreds of meters, or even several kilometers; in addition, the entire Zigbee network can also be connected with various other existing networks. For example, you can monitor a Zigbee-controlled network somewhere in Yunnan via the Internet from Beijing. The difference is that Zigbee network is mainly established for automation control data transmission, while the mobile communication network is mainly established for voice communication; the value of each mobile base station is generally more than a million yuan, while each Zigbee "base station" is less than 1,000 yuan; each Zigbee network node can not only monitor the object, such as sensors connected to direct data collection and monitoring, it can also be connected with other existing networks, such as the Internet to monitor a Zigbee control network. Each Zigbee network node can not only connect with monitoring objects, such as sensors, to directly collect and monitor data, it can also automatically relay the data transmitted by other network nodes; In addition, each Zigbee network node (FFD) can also be in the range of its own signal coverage, and a number of isolated nodes do not undertake the task of relaying network information (RFD) wireless connection. Each Zigbee network node (FFD and RFD) can support up to 31 sensors and controlled devices, and each sensor and controlled device can have 8 different interface methods. Digital and analog data can be collected and transmitted. Application areas of Zigbee technology: Zigbee technology is aimed at industrial, home automation, telemetry, automotive automation, agricultural automation and medical care, such as lighting automation control, wireless data acquisition and monitoring of sensors, oilfield, power, mining and logistics management applications. In addition, it can locate moving targets in a localized area, such as vehicles in a city. (Patented technology of Chengdu Xigu Shuguang Digital Technology Company). Usually, if the application meets one of the following conditions, Zigbee technology can be considered to be used for wireless transmission: 1. the need for data collection or monitoring of many outlets; 2. the amount of data required to be transmitted is not large, and the requirement of low cost equipment; 3. the requirement of data transmission can be high, high security; 4. the equipment is small in size, it is inconvenient to place a large rechargeable batteries or power supply modules; 5. battery-powered; 6. complex terrain, many monitoring points, the need for a large battery-powered; 6. the terrain is complex, many monitoring points, the need for larger Complex terrain, many monitoring points, requiring large network coverage; 7. Blind areas of the existing mobile network coverage; 8. Telemetry and telecontrol systems using the existing mobile network for low data transmission. 9. 9. The use of GPS effect is poor, or the cost is too high for the local area of mobile target positioning applications. Zigbee technology features: power saving: two five batteries to support up to six months to two years of use Reliable: collision avoidance mechanism, while the need for a fixed bandwidth for communication services reserved for a dedicated time slot, to avoid sending data competition and conflict; node modules with automatic dynamic networking between the function of the information in the entire Zigbee network through the automatic routing of transmission, thus ensuring the transmission of information, thus ensuring the transmission of information. The node modules have the function of automatic dynamic networking, and the information is transmitted through automatic routing in the whole Zigbee network, thus ensuring the reliability of information transmission. Short delay: Optimized for delay-sensitive applications, the communication delay and activation delay from sleep state are both very short. Large network capacity: supports up to 65,000 nodes. Security: ZigBee provides data integrity checking and authentication function, encryption algorithm adopts universal AES-128. High confidentiality: 64-bit factory numbering and support AES-128 encryption Zigbee's development prospects: Zigbee technology and RFID technology in 2004 was listed as the world's fastest-growing, the market prospect of the most extensive top ten of the newest technology in the two. The future of Zigbee. About this report, you just in Baidu, or GOOGLE search bar type "Zigbee", you will see a lot of relevant reports. In short, the next few years, will be a period of rapid development of Zigbee technology. Zigbee technology in China: Although, many people have begun to pay attention to Zigbee this new technology, and there are many units began to get involved in the development of Zigbee technology, however, due to the Zigbee itself is a new system integration technology, the development of application software must be combined with the network transmission, radio frequency technology and the underlying hardware and software control technology. Therefore, in-depth understanding of this new technology from abroad, and then organize a supporting team with rich experience in these areas, itself is not an easy thing, so far, the country is currently in addition to the Chengdu Xigu Shuguang Digital Technology Co., Ltd., the real Zigbee technology into products, and successfully used to solve the problem of the actual production of a few areas and has not yet seen other Report. Comparison between Zigbee and the existing mobile network (GPRS, CDMA-1X): 1. No network usage fee: the use of mobile network needs to pay network usage fee for a long period of time, and it is calculated according to the number of node terminals, but there is no such fee for Zigbee. 2. Low investment in equipments: the use of mobile network requires the purchase of mobile terminals, and the price of each terminal is around RMB1000 yuan, while the use of Zigbee network, not only can it be used in the mobile network, it can also be used in the mobile network. Using Zigbee network, not only the cost of Zigbee network node module (equivalent to the base station) is less than RMB 1,000 per node, but also the price of the main network sub-node (equivalent to the cell phone) is much lower. 3. Communication is more reliable: Since the existing mobile network is mainly designed for the cell phone communication, even though the CDMA-1X and GPRS can be used for the data communication, it is found that not only the communication rate is lower than the designed data communication, but also the communication rate is lower than the designed data communication rate. Although CDMA-1X and GPRS can be used for data communication, it is found that not only the communication rate is much lower than the designed rate, but also the reliability of data communication has some problems. On the other hand, Zigbee network is specially designed for the transmission of control data, so the transmission of control data is quite guaranteed. 4. a high degree of flexibility and low cost: first of all, through the use of Zigbee network nodes covering different distances, different functions, as well as other non-Zigbee system of low-cost wireless transceiver modules, the establishment of a Zigbee local automation control network, (the network can be star, tree, mesh and its *** with the composition of the composite network structure) and then through the Internet or mobile network and the remote computer connected, thus realizing low-cost control data transmission. Remote computer connected to the Internet or mobile network, thus realizing low-cost, high-efficiency industrial automation telemetry remote control; 5. Compared with the existing mobile network, although Zigbee is only a local area network (LAN), covering a limited area, but it can be connected with the existing mobile network, the Internet and other communication networks, will be many Zigbee LANs are connected to each other as a whole. Effective solution to the mobile network's blind coverage problem: We know that the existing mobile network in many places there are blind spots, especially railroads, highways, oil fields, mines and other fields, especially so. And increase the cost of a mobile base station or repeater is considerable, at this time the use of Zigbee network for blind coverage is not only cost-effective, and is often now the only feasible means. Comparison of Zigbee and existing digital transmission radio: 1. High reliability: Because the integration degree of Zigbee module is much higher than the general digital transmission radio, separation of components, and thus higher reliability; 2. Easy to use and safe: because of the high degree of integration, compared with the general digital transmission radio, Zigbee receiving module volume can be made very small, and low power consumption, for example, Chengdu Xigu long-distance transmission module (2-5 kilometers), the maximum transmission distance of the module (2-5 kilometers), the maximum transmission distance of the module (2-5 kilometers), the maximum transmission distance of the module (2-5 kilometers). 2-5 kilometers), the maximum transmitting current is much smaller than a CDMA cell phone, thus it is easy to integrate or directly placed in the equipment, not only easy to use, but also in the outdoor use, it is not easy to be damaged. 3. Strong anti-jamming force, good confidentiality, low BER: Zigbee transceiver module uses 2.4G direct-sequence spread-spectrum technology, which has a better performance than the general FSK, ASK and frequency hopping digital transmission radios. Free frequency band: Zigbee uses free frequency band, while many digital transmission radios not only need to apply for the frequency band, but also need to pay a considerable frequency usage fee to the National Commission every year. 5. Low price: Zigbee transceiver module uses 2.4G direct-sequence spread spectrum technology, which is more secure than general FSK, ASK, and frequency-hopping radio. 5. Low price: the price of Zigbee digital transmission module is only a fraction of that of digital transmission radios with similar functions; (2.4G, 250kps, 3-5km distance DSSS digital transmission module is less than 1,000 RMB each) How to utilize Zigbee to generate benefits as soon as possible: In order to make everyone faster and better to use Zigbee technology to solve the practical problems in different applications, without the need to know more about Zigbee technology, it is necessary to use Zigbee technology to solve the practical problems of different applications, without the need to know more about Zigbee technology. In order to allow you to faster and better use Zigbee technology to solve practical problems in different application areas, without the need to understand how the Zigbee network itself works, thus greatly reducing your system integration time, and quickly bring you practical economic benefits. Chengdu Xigu Shuguang Digital Technology Co., Ltd. specializes in providing users with a demo/application kit of the Zigbee wireless network platform and specific application development training. This kit includes: 1). 5 standard demo/application modules (one of which is used as a gateway node to connect with a computer); 2). Batteries, antennas and other accessories; 3). Zigbee network function demonstration software; 4). Two USART interfaces for each module; 5). A standard serial communication protocol for connecting the application modules to your computer and sensors. If our standard serial protocol does not meet the needs of your specific application, we can, in principle, modify it to meet your specific requirements. With this kit, you can program your application exactly according to the wired network connection; the actual wireless network, as a general wired network to be utilized. This package has the following demonstration functions: 1. Demonstrate the automatic dynamic networking function of the Zigbee network itself; 2. Demonstrate the automatic routing of data transmission in the network and how the data is transmitted in the network; 3. Show the status of the network's wireless link connection and the actual data transmission statistics of each network node; 4. Demonstrate a variety of data collection functions of the entire network; 5. Demonstrate the control center's control of remote network nodes; 6. More importantly, in addition to the above demonstration functions, it can also be used to check the wireless link connection status of the actual network layout, and evaluate and adjust the specific layout of the network nodes on site. Each module in this kit provides two USART interfaces for users to write their own applications and use them directly. In this way, the user can according to their actual application needs, determine the number of network nodes required and the specific settings of the remote end, then you can write a specific application program software. When your software development work is completed, you can directly use the standard modules we provide for on-site installation and setup, you can work.