Universal Telecommunications System Research Articles

Dual band new bisected-Π CRLH metamaterial cell loaded dipole antennas

In this paper, two different designs for new metamaterial loaded dipole antenna are presented. The designs are based on loading printed dipole antennas with modified versions of composite right left handed cells. Different objectives are intended for these new designs; which are achieving compact size, dual band functionalities and good gain of the loaded dipole antenna. The designed antennas can serve different wireless services for GPS (1.227 GHz and 1.57 GHz), Universal Telecommunications System (UMTS 1.9 GHz), and WiFi (2.4 GHz). The two presented antennas have gain whose values are better than 1.9 dB up to 3.5 dB at all operating frequencies. The designed loading has reduced the physical / electrical length of conventional dipole antenna by 25%. The theoretical analysis, circuit model, full wave simulations and experimental measurements of the reported antennas are introduced.

Processing capacity planning and optimisation of UMTS and beyond radio access network architectures by simulation

The tendency in future mobile networks consists in a rapid growth of Internet Protocol (IP)-based traffic and services. In contrast to this tendency, 3rd Generation (3G) cellular networks were designed assuming a predominance of circuit switched traffic and thus, are not designed to efficiently carry IP-based packet data traffic. Consequently, 3G cellular networks have to evolve architecturally. Evolved cellular network architectures are expected to provide performance values which are at least comparable to existing cellular network architectures without the necessity to provide additional processing capacity. This paper presents an event-driven and tool-based simulation methodology, which provides decision support to the network designer of future cellular networks, when assessing future Universal Telecommunications System (UMTS) Radio Access Networks (RANs) with regard to signalling performance in a very early design phase. A case study on processor capacity planning and End-to-End (E2E) signalling performance optimisation of a conceivable RAN evolution scenario is also provided.

Telecommunications Tutorial ‐ Part 3

It was convenient to talk about standards for modems when that topic was discussed in Part 2 of this series. Unfortunately modem standards are only a small fraction of the standards needed if a universal telecommunications system is to become a reality—particularly if machines on which ‘Terminal Services’ are running are to easily communicate with each other (fig.1).