Compared to other wired networks, complexity in the 3G UMTS is due its interactions with different entities. Within the UMTS, services have to deal with a great number of different QoS, small user display, variant bandwidth and small battery power. Most of the services are generally bind to the particular systems or APIs. In this article, we look at the evolution of different technologies on wh...

Europäische Telekommunikationsfirmen haben in den vergangenen zwei Jahren Milliarden von Euro ausgegeben, um zum einen eine UMTS-Lizenz für den Betrieb eines Mobilfunknetzwerkes der 3. Generation zu erhalten und zum anderen die dafür notwendige Infrastruktur aufzubauen. Vor dem Hintergrund der bereits in Teilen von GSM-Netzwerken festzustellenden Überlastungssituationen stellt sich die Frage, o...

The past few years have seen mobile operators transition to next-generation mobile networks, specifically from third-generation networks (3G) to long term evolution (LTE). This paper describes the basic architecture and topology of UMTS R4 core network and introduces two options in network planning, i.e., flat structure or layered structure. This paper introduces the re-homing of radio network ...

We propose a hybrid coupling scheme to connect UMTS and WLAN networks. Under the tightcoupled system, users of WLAN can also use the services of UMTS with guaranteed QoS and seamless mobility, but it is a problem that the capacity of UMTS core network nodes is not enough to accommodate the bulky data traffic from WLAN, since the core network nodes are designed to handle circuit voice calls or s...

Along with the widespread deployment of the Third Generation (3G) cellular networks, the fast-improving capabilities of the mobile devices, content, and service providers are increasingly interested in supporting multicast communications over wireless networks and in particular over Universal Mobile Telecommunications System (UMTS). To this direction, the Third Generation Partnership Project (3...