Using wireless access to build VPN network for enterprises

The biggest feature of broadband wireless access is the rapid and flexible networking, which can provide services to users at the fastest speed. It can provide such as wireless Internet access, wireless VPN, IP telephony, VOD video-on-demand, LAN interconnection and other types of business. Among them, enterprise users are more concerned about how to use broadband wireless access to build their own VPN.

In order to meet the needs of China's telecom market development, we should encourage competition and optimize the allocation of radio frequency resources. April 2001, the Ministry of Information Industry decided to 2x30mhz frequency band in the 3.5GHz band through the Tender method, in Nanjing, Xiamen, Qingdao, Wuhan, Chongqing, and other 5 urban administrative areas, the first batch of ground fixed wireless access system distribution. This is the first time in China to distribute the frequency of tender, it greatly promoted the development of broadband wireless access.

Various types of business

The broadband wireless access uses the point-to-point microwave technology, uses the high efficiency modulation, transmits the data to the user in the form of the wireless. Its biggest characteristic is the network fast, nimble, can provide the service for the user with the quickest speed, the main service object is the small and medium-sized Enterprise, the community, the office building, the public organization, the education and the Scientific research Unit.

The main features of broadband wireless access include:

• Good transmission performance, advanced technology, a wide range of coverage;

• Lower cost and high flexibility;

• Adopt high efficiency modulation mode, with higher spectrum utilization;

• Fast service delivery, low operation and maintenance cost;

• The use of dynamic bandwidth allocation technology, flexible allocation of bandwidth;

• Safe, reliable and stable, providing QoS assurance.

Broadband wireless access can provide a variety of business including: Wireless Internet access services, wireless VPN services, IP telephony services, VOD video-on-demand service, LAN interconnection services and other wireless access based value-added service. (Computer science)

Develop a clear idea

Broadband wireless access should have a clear market positioning:

Positioning one: Broadband wireless access technology is more suitable for specific user services. It can be more successful in the campus, multi-storey residential and densely populated cities and other specific areas of a larger application.

Location two: For enterprise users and group users. At present, some enterprises, especially many small and medium-sized enterprises do not realize optical access, but it has a greater demand for high-speed data services, to provide these users with broadband wireless access, its high speed and relatively low investment is very attractive.

Positioning three: Broadband data-oriented integrated services. Because broadband wireless access can provide high bandwidth and integrated business capability, it has a great advantage in providing data service, and the comprehensive application of broadband data should be its main direction. With the wide development of multimedia service in the field of communication, broadband wireless access will play a more and more important role. And the wireless Broadband revolution, will also give a huge impetus to the expansion of wireless communications services.

With the reform and opening-up of China's telecommunications industry, the trend of the whole telecom operation is to diversify the operating body, the focus of market competition from long-distance backbone to local access, market competition requirements of access means diversity, broadband wireless access by virtue of its rapid and flexible network, operation and maintenance convenience and good cost competitiveness, is rapidly becoming a hot spot in the market.

Establishing VPN with broadband wireless access

For enterprise users, may be more concerned about using broadband wireless access to build their own VPN. Security and usability are critical to the user. With the development of science and technology, business activities and the relationship between the Internet increasingly close, more and more business activities need to high-quality, high-speed data transmission technology. Through scientific program design, meticulous field survey, strict construction and installation procedures, wireless access technology and optical fiber technology can be comparable. Using Wireless access technology: Users will enjoy the fiber-like services, but the price can be greatly reduced, the process of getting the service is very fast. Therefore, the use of wireless access to establish their own VPN is the wise choice of enterprise users. Wireless VPN is the use of wireless access technology access to a common network of VPN.

Fig. 1 Fixed wireless access network established by Chinese communication in Wuhan

Wireless access can consist of either a single cellular network or multiple hives, as shown in Figure 2 and Figure 3.

Fig. 2 Single Cell Network Diagram

Fig. 3 Multi-cell Network Diagram

With the increasing communication, the continuous development of enterprises, the branches of enterprises are also distributed throughout the country and around the world. In order to strengthen the internal contact of enterprises, more and more enterprises realize the importance of establishing intranet, start to set up intranet, connect branches and mobile office users. At present, the enterprise intranet has been built, mostly by leasing the telecom department's data line to form. From the network structure, it is generally a star structure. This type of access is extremely expensive and discourages most users. For those who are on a business trip, if they need to contact headquarters, it is often necessary to dial the Internet through dial-up to the intranet, which can not guarantee its security and reliability. Therefore, it has many disadvantages: the network operation maintenance cost is high, the scalability is poor, the reliability is poor. The development of Internet has promoted the development of virtual private network based on public network. Virtual private networks provide secure, reliable connections on shared public network infrastructures such as the Internet, and because they are shared, the cost of the connection is lower than the existing private network. Users use a virtual private network to connect to a remote Web site, the cost of the entire wide area network can save 20%-47% or more. But how to ensure the security and confidentiality of the data transmission through public network, and how to manage the different nodes of the enterprise network in the public net, becomes the concern. The Virtual private network technology uses the special network encryption and the communication protocol, may enable the enterprise to establish the fictitious encrypted channel in the public network, the establishment safe, the low cost enterprise intranet.

How to build a VPN

If the enterprise set up their own VPN, the first will cause a waste of funds, VPN devices need to carry out complex encryption processing, the need for a powerful processor to achieve higher performance, so the VPN devices are mostly more expensive. Secondly, the need for complex management of VPN, enterprises need personnel to the VPN equipment in all parts of the installation, commissioning and maintenance.