Abstract: In view of the increasing demand for wireless information and data services, providing faster and reliable mobile access is becoming an important concern. Nowadays, not only mobile phones, but also laptops and PDAs are used by people in their professional and private lives. These devices are used separately for the most part that is their applications do not interact. Sometimes, however, a group of mobile devices form a spontaneous, temporary network as they approach each other. This allows e.g. participants at a meeting to share documents, presentations and other useful information. This kind of spontaneous, temporary network referred to as mobile networks (MNs) sometimes just called ad hoc networks or multi-hop wireless networks, and are expected to play an important role in our daily lives in near future.