O impacto de ataques de redução da qualidade de serviços em redes wi-fi com controle de potência de transmissão

Abstract

Wireless networks have been used because they provide mobility to the users and they are in everywhere. Some mechanisms, like IEEE 802.11, also called Wi-Fi, have been created to ensure mobility and to help managing the data traffic of all users in the network. 802.11 has two coordinators functions, called DCF and PCF, responsible for media access control. These coordinators functions are vulnerable to attacks that deny the service of stations, such as reduction of quality attacks, that can lead to the whole destruction of the normal behavior of the network. Nevertheless, to ensure that the network may have more power saving and more spatial reuse, it is required to use transmition power control. This control is used when an station wants to send a frame to it’s neighbor that is one hop distant. In this work is shown that transmition power control can have frames rate delivery, analogous to the one network that not use transition power control, and it may have more power saving. Also it describes how reduction of quality attacks can degrade the frame rate delivery in more than 30% in one network that uses, or not, transmition power control.