Quality-based technique for routing and playout buffering in IP Telephony over Mobile ad Hoc Network

Luigi Atzori MCLab, Department of Electronic Engineering University of Cagliari Cagliari 09123 Italy [email protected] In the last few years, Voice over IP (VoIP) providers have been a strongly growth compared with traditional voice service operators. The main motivations are the low-cost of the packetbased technologies and the reliability of the current (wired) IP network. Nowadays a new network for VoIP applications have been placed: Mobile Ad hoc NETwork (MANET). We strongly believe that this technologies will have success in the next future. However this particular network includes different limitations one of these is the highly variability of the network topology and channel behavior. This is an obstacle to the service quality due to route losses and significant delay variations. In this our study, we want to present a new strategy to improve Quality of Service (QoS) in MANETs. Our strategy is divided in two tasks: selecting of transmission paths and adjusting the playout delay. In the first task we select the route that at the moment is characterized by low network delay and jitter through the use of QOLSR routing algorithm, while in the second task we use an adaptive intertalkspurt strategy founded on a objective quality-based approach as ITU-T E-Model. We also present preliminary results of the proposed strategy, which encourage further investigations.