With the introduction of 802.11n and Mesh technology, wireless local area network (WLAN), as a new means of Internet broadband access, is gradually changing the traditional way of accessing the Internet based on fixed broadband. Getting rid of the shackles of network cables, people can connect to the Internet through portable terminal devices such as laptops, netbooks, smart phones and other places where wireless LANs are deployed, such as libraries, shopping malls, cafes, restaurants and other public places as well as office buildings, which greatly meet the urgent needs of users to access the Internet anytime and anywhere. The application of centralized wireless LAN architecture has greatly reduced the cost and simplified the tasks of wireless system management, security and upgrading, making wireless LAN rapidly popularized and developed.

　　Wireless LAN adopts wireless channel as the information transmission channel between the terminal and the Access Point, which is more open and convenient than the traditional fixed line. At the same time, it also brings new challenges to network security. The original network security technology, strategy and management mode of fixed LAN can no longer meet the requirements of network security under the new situation of wireless LAN. Especially for enterprises with high demand for network security, how to effectively prevent illegal access from the outside world and protect sensitive information while using wireless LAN to improve office conditions is the focus of current enterprises.

　　Although some standards (such as Wi Fi WPA2 and 802.11i) can provide a new level of wireless security capabilities and are supported by new monitoring and intrusion protection tools, the focus of enterprises has turned to how to combine traditional network security and physical security to form a new network security solution based on location information. Help enterprises balance the contradiction between providing mobile Internet services for their employees and visitors, and providing necessary checks on such unmanageable freedom.

　　For example, the enterprise has deployed a wireless LAN in its office building to facilitate employees' office work, but the enterprise does not want people outside the office building to access its own wireless LAN to prevent network attacks, sensitive information theft and other security risks. For another example, the enterprise needs to implement wireless Internet access for the HR department because of office work, but it needs to restrict wireless access except for the HR department to prevent others from accessing sensitive data within the department, such as employee information, performance appraisal information, etc.

　　This is the root of the role of location-based security technology: restricting access to wireless LAN based on user's location information. In addition to adding a layer of physical security protection, location control and access control can also prevent overloading of network units (and prevent "denial of service attacks"), and limit where visitors can access the network.

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