I. Introduction
The IEEE 802.11 [19] wireless local area networks (WLANs) were originally designed to give a solution to the huge problem of tangled cables of the end user devices. The stations (STAs) are wirelessly connected to the available access points (APs) and the APs are connected to a wired backbone network. The evolution of these networks are the mesh networks where a wireless backbone network is set up in order to support end-to-end wireless user communication [17]. Several wireless routers that are part of this wireless backbone network, forward the traffic in the network. In addition a number of these routers also serve as APs. The STAs are associated with the available APs and send their data through them. Undoubtedly, the mesh networks are quite similar to the infrastructure WLANs but they take an important benefit of their self-organized structure and their dynamic nature. We can allegate that the mesh networks are ad-hoc networks that operate in an infrastructure mode. In this way they combine the benefits of ad-hoc networks and WLANs.