Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 63 for “"UMTS"”.
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Radio Resource Management for Satellite UMTS. Dynamic scheduling algorithm for a UMTS-compatible satellite network.
… of the radio resource management strategy of a UMTS compatible satellite network, taking into account the unique characteristics of wireless channel conditions. This thesis will initially be focused on the design of the network and functional architecture of a UMTS -compatible satellite network. …
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Analytical models of IP traffic on UMTS mobile networks
… investigated the performance of IP traffic over UMTS networks. UMTS is a Third Generation (3G) replacement for GSM technologies and consists of a land-based Core Network and a UMTS Radio Access Network (UTRAN). UMTS networks utilise Code Division Multiple Access (CDMA) technologies to multiplex …
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A Connection Admission Control Framework for UMTS based Satellite Systems.An Adaptive Admission Control algorithm with pre-emption control mechanism for unicast and multicast communications in satellite UMTS.
… increases the performance of the system for a UMTS based satellite system supporting unicast and multicast traffic. The design of the system architecture for a UMTS based satellite system is presented. Based on this architecture, a CAC framework is designed consisting of three different …
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The effects of network factors on the performance of 3G UMTS applications
… how network factors affect the performance of 3G UMTS applications; which network factors have the most significant impact on a specific application; whether there are any minimum requirements needed for an application. Eight popular 3G applications were investigated: FTP, email, MMS, SMS, HTTP …
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Performance evaluation of AAL2 over IP in the UMTS access network Iub interface
In this study, we proposed to retain AAL2 and lay it over IP (AAL2IIP). The IP-based lub interface is therefore designed to tunnel AAL2 channels from the Node B to the RNC. Currently IP routes packets based on best-effort which does not guarantee QoS, To provide QoS, MPLS integrated with DiffServ …
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Universal mobile telephone standard (UMTS) licensing : recent European experience and the South African case by Nicolas Theopold.
The telecommunications industry was long regarded to be one of "natural monopoly". Technological development has, however, changed the situation in the industry fundamentally: with the introduction of digital wireless telephony (also called "GSM " or "second generation (2G)), competition could …
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Large signal modeling of GaN HEMTs for UMTS base station power amplifier design taking into account memory effects
Compared to GSM, the data-rate of UMTS is considerably increased so that mobile broadband applications are possible. However, the specifications of UMTS mobile phones and base stations are more stringent. Due to the high crest factor of UMTS-signals, RF-frontends of UMTS base stations are required …
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Propuesta y evaluación del protocolo SIP para el soporte de señalización en la red de acceso radio de sistemas UMTS
La evolución de las especificaciones UMTS muestra la tendencia a la convergencia IP y al uso del protocolo SIP del IETF. Con respecto a la red de acceso radio de estos sistemas, las Especificaciones de la Reléase 99 proponen señalización del tipo SS7 y transporte ATM. Posteriormente la Reléase 5 …
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Ultra Wideband Interference on Third-Generation Wireless Networks
… falling under the UWB emissions mask. UWB and UMTS (Universal Mobile Telephone Systems) devices will coexist, sharing the same spectrum. In this research, we investigate the UWB-3G coexistence problem, analyzing the impact of UWB on UMTS networks. Firstly, we review the mathematical model of …
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A Network System Level Simulator for Investigating the Interworking of Wireless LAN and 3G Mobile Systems
… selectively gain network access through either a UMTS Node-B or through a 3G-aware WLAN access point. The UWLAN_AP was made 3G-aware by augmenting it with the capability to process UMTS control messages in order to build an access control table to support UMTS authentication and access control. …
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Mobile network design : Orange UK 2G to 3G mobile backhaul evolution
… of a GSM/GPRS (2G) cellular mobile network to UMTS (3G) and then subsequently, HSDPA. The particular technical area of research relates to the mobile backhaul network which provides the connectivity between radio cell sites which support the wide area radio coverage, and the mobile network …
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Current and evolved physical layer concepts : potentials and limitations of mobile broadband wireless access
… physical layer of the current Release 8 of the UMTS LTE mobile radio standard implemented as single-antenna system. Different novel modifications and alternative concepts are introduced and analyzed which aim at either increasing the physical layer performance or at decreasing the computational …
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Gallium nitride class-F power amplifier for UMTSWCDMA applications
… Universal Mobile Telecommunications System (UMTS) technology has already implemented 3G communication standard for mobile communications. Power amplifiers are the most power consuming unit in wireless communication systems. The power amplifiers used in UMTS devices need to be highly …
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