Secure Wireless Network in Quadrilateral Region

According to circular range of antenna broadcasting, The usual shape of environment is circular, but most of companies and establishments have a quadrilateral region. In some applications like as military or research company, It is important that nobody out of region, can access to their network. In other word, network services must be valid only inside the region. There are some techniques to be in this situation. The novelty of this paper is: 1) distinguish the position of users at region, 2) making a quadrilateral region for wireless environment (rather than circular). Two basic techniques are used to reduce the cost of this feature, and both of them use snoopy method. This technique can reduce DoS and active search effect at security.