Off-the-Shelf Infrastructure for Innovative Mobile Communication Services in Angola

VoIP technology implementation over 802.11 standard in corporate environment is a challenge when it comes to ensuring Quality of Experience (QoE) before and during the handoff process. To this regard, we have developed a solution leveraging off-the-shelf enablers to insure high-quality mobile VoIP service with in a wireless Local Area Networks (LAN). Our case study has been assessed via simulative and laboratory experimentation methods. We also applied the MOS conversation opinion test method to 42 users, who evaluated the QoE of the system, according to the ITU-T P.800 recommendations. The tests carried out both in laboratory and corporate environments showed a satisfactory QoE (median MOS of 4.5 / 5.00), including cases of concurrent and conference calls. Such results guarantee a low-cost high-quality mobile communication service over the 802.11. In this context, our solution is a potential alternative to the conventional mobile networks, mainly in current days of coverage deficit and the galloping QoE degradation offered by Angolan mobile operators. Keywords: VoIP; WLAN; ITU-T P.800; handoff; QoE.