Performance measurements of four wireless systems (GSM900, GSM1800, UMTS and WLAN) simultaneously transported over an indoor wireless network fed by a low-cost 850-nm vertical-cavity surfaceemitting laser (VCSEL) – 300m length of multimode fibre is presented. The measurement focuses on the error vector magnitude (EVM) performance of the GSM900, GSM1800, and UMTS in co-existence with each other ...

This paper addresses the UMTS system performance analysis over dedicated channels based on buffer length allocation and dynamic allocation control procedures. Throughput and access delay for packet data transmission is evaluated as a function of network load for both of the allocation procedures. A mathematical model, which can be used to analyze the throughput of UMTS dedicated channel, is pro...

This paper deals with the inter-system interference of third generation mobile communication systems being introduced in frequency bands adjacent to the European DECT band. A method to evaluate the required minimum frequency separation (MFS) of coexisting mobile communication systems is presented. Based on this comprehensive evaluation concept, this paper discusses the required minimum frequenc...

Ad-hoc extensions of cellular networks help reducing intra-cell interference and hence increasing the capacity of cellular systems. This paper proposes an appropriate distribution of UMTS protocols between end terminals and intermediate relaying devices aiming at increasing capacity in UMTS while following two main principles: improving robustness by using a direct cellular connection for signa...

The performance of a multi-rate mobile cellular network using the Frequency Division Duplex (FDD) mode of the Code Division Multiple Access (CDMA) based Universal Mobile Telecommunication System (UMTS) is investigated. The new call blocking and call dropping probabilities and the tolerable network load are studied in the context of a multi-rate FDD-mode UMTS network incorporating dynamic thresh...

This paper describes mobility management for the third-generation mobile networks. We focus on the evolution from General Packet Radio Service (GPRS) to Universal Mobile Telecommunication System (UMTS). In this evolution, the radio access network UTRAN has been introduced, and radio-related management is moved from the core network to UTRAN. We elaborate on how this architecture change affects ...

This paper presents methods for synchronization in the downlink of a UMTS/TDD system. Space-time processing based on multiple receive antennas is used to suppress potentially strong co-channel interference caused by other base stations. We develop a detection-based synchronization procedure exploiting the structure of UMTS/TDD, and we present three alternative detection algorithms. Simulation r...

The paper addresses the use UMTS terminals for “probing” the signal level as a function of location for the purposes of network planning and monitoring. Potential UMTS location techniques are presented and the location performance of time delay and correlation based techniques is estimated by using impulse responses calculated by three-dimensional simulation techniques. The probing accuracy is ...