The solution of wireless network access in the construction of rural informatization

With the further development of "construction http://www.aliyun.com/zixun/aggregation/31972.html" > Socialist New Countryside ", the rural information construction is advancing continuously, and the problem of rural broadband household is becoming the focus of farmers ' attention. At present, "Digital agriculture Construction", "Agricultural Information Service Network", "Million household Internet Project" and "modern peasant long-distance education" are booming in rural areas of our country. But the rural area is broad, the terrain environment is complex and diverse, the residence distance is far and disperse, the investment level of network construction and the limit of consumption level, etc., many difficulties restrict the development of rural informatization construction.

The construction of rural-village-level network should take into account the characteristics of relatively dispersed farmers ' residence, less demand from internet and less cost of one-time input construction. Wireless local area network, with its advanced technology and mature, network coverage area (open area reaches 5 square kilometers range), high bandwidth and stable (11m/54m), flexible expansion (to meet the rapid increase in the number of users), relatively low cost of wired network one-time investment, as well as a short construction cycle, Maintenance convenience and many other advantages, become the first choice of rural network construction.

Wireless coverage in rural areas is fully wireless. WLAN technology has no or little wiring, fast and convenient installation, free from the constraints of space and building structure, just can solve the rural network construction encountered wiring problems. According to the rural reality, The construction of rural wireless network is to adopt 2.4GHz and 5.8GHz mixed networking mode: Using 5.8GHz wideband wireless access to realize the last kilometer backbone network access, using 5.8GHz Wireless Bridge to realize the network access between the telecom room and the village access base station, using the 2.4GHZ outdoor wireless access point to realize the wireless coverage to the rural residents. For the client, can be based on the user to access the base station distance, wireless network card can be used, wireless AP, outdoor wireless network Bridge to achieve. The use of 2.4GHz Wireless LAN technology to cover a large number of rural users, not only can save a lot of wiring installation costs, and because in the wireless LAN to increase or reduce users is quite easy, by increasing the number of wireless access points can increase the number of users and coverage, This feature is very suitable for the gradual development of the network construction needs of rural users. Operators can flexibly configure the equipment according to the development of the number of rural users, so as to make full use of resources and save cost. In the initial stage of the network, can be configured with fewer access points, as the number of users increased, in accordance with the need to increase the number of access points, can save a lot of money.

Program Introduction

1. Wireless network connection solution between base station access and Operation headquarters

In the village select a user relatively concentrated to the high point (also can build 30 meters tall tower), install 5.8GHz remote station and operator Headquarters 5.8GHz Center Station Communication, through 5.8GHZ remote Station m Ethernet port access to base station switches, switches and erected on the same roof (tower) 5.8GHz Wireless Network Bridge Center station is connected, in other need to connect the village also set up 5.8GHz Wireless bridge remote station and operation headquarters for data communication. Wireless Bridge Center station adopts 120-degree sector antenna (can be increased by the number of 2.4G Bridge network and the angle of the antenna), 3 units can be used to cover all households within 5000 metres.

Figure 1 Rural informatization wireless network access connection schematic

2. User Wireless Network access solution

The use of high-power wireless AP to the rural area for signal coverage. Wireless AP signal can cover a distance of about 5000 meters, but for the current pen users, the market wireless network card can receive AP signal, but unable to communicate, how to solve the user-side access is the main part of the scheme. For this rainbow Union to use the client-side grading approach, Adopt wireless network card, wireless AP, outdoor wireless bridge Three kinds of access method to solve this problem.

For the rural housing itself wireless network access construction. For the radius of 500 meters, you can directly receive the signal with the network card users using wireless network card access. The rural housing is basically one family, the window body is few, the PC generally places in the room, the wall body layer barrier and the wall body may have the influence of the steel structure, the wireless signal attenuation will be very big. In addition, every household in the countryside is far apart, therefore, consider in the use of wireless network card to receive households, using wireless AP access, based on the calculation of approximately 2000 meters in the radius before the user can directly use wireless AP access. For households with a radius of more than 5000 meters, the AP wireless access to the signal can be used outside the wireless network Bridge. The outdoor high-power wireless network bridge power, with high gain antenna, can make the information received farther.

The entire wireless network can be freely expanded in capacity. Usually a 2.4GHz high power outdoor wireless access point can access 256 clients. Now the design can basically meet this requirement. Of course, if the number of users in the future increases, it is entirely possible to add a wireless access point (AP) to resolve. Wireless access points are WEP64 or 128-bit encrypted, which ensures that the data of wireless communication is transmitted. In addition, by setting the wireless network card group, the wireless access point and wireless network card can be grouped, so as to control the user access function.