Αμφίδρομες υπηρεσίες video πάνω από το δίκτυο 3G
Στριγκλής, Αριστείδης Δ.
SubjectMobile communication systems ; Interactive multimedia ; Ψηφιακό βίντεο ; Τηλεπικοινωνίες ; Τηλεφωνική επικοινωνία
The transition from second generation networks (2G) to third generation networks (3G) has increased the number of mobile phone users who wanted to see their partner on the other hand as it is common through VoIP services. Mobile telephony acquires new features by integrating interactive video. The interactive voice services such as IVR (Interactive Voice Response), have been upgraded with the addition of image services IVVR (Interactive Voice and Video Response). It is projected that by 2013 64% of the traffic of the mobile telephony network worldwide will be video, with an annual rate of increase of 150% between 2008 and 2013. The biggest animation in video traffic is expected to happen in Western Europe. While the one-way video streaming service has increased significantly in recent years with the spread of 3G, two-way communication of video services have more stringent requirements regarding the delay and packet loss, making it difficult to transmit to mobile users who require constantly high quality services. In response to these challenges, many mobile providers have developed video services based on the 3G-324M standard in order to offer reliable quality of service (QoS) on the 3rd generation networks comparable with the network access services offered by the IP-based network. This master thesis presents the development of interactive video services that are supported by the third generation network in conjunction with the ISDN network. For the development of these services we use a test platform based on the Asterisk PBX, an open source software used in telecommunications that converts a computer to a telephone center with unlimited possibilities, adding the 3G-324M function. A brief description of video technology and codecs necessary for its functioning, as well as the environment in which they grow (3G, ISDN, PBX Asterisk) are presented. All the modifications to the code and the configuration necessary for the operation of the 3G-324M gateway are described in detail.