Achim Wacker

Radio Network Planning and Optimisation for Umts

From the Publisher: Radio Network Planning and Optimisation for UMTS comprehensively explains how to dimension, plan and optimise UMTS networks. It introduces the properties of the spread spectrum system and provides a general overview of the physical layer of UTRA FDD. The radio network planning process for WCDMA is clearly presented and detailed information on how to dimension, plan and rollout a 3G network, both theoretically and practically is provided. This valuable text examines current and future radio network management issues and their impact on network performance as well as the relevant capacity and coverage enhancement methods. Authoritative and instructive, this text will have instant appeal to wireless operators and network and terminal manufacturers. It will also be essential reading for university students, frequency regulation bodies and everyone interested in radio network planning and optimisation, especially RF network systems engineering professionals.

Verification of WCDMA radio network planning prediction methods with fully dynamic network simulator

The WCDMA based cellular systems offer variability of packet and circuit switched services and therefore are more complicated to plan and control than todays networks. For an operator, it is essential to utilise all possible resources to improve the capacity and quality of service of the radio network. To guarantee the optimum performance, the operator must have means to visualise the offered services and their quality in the radio network-planning phase. The proposed static prediction method is compared with dynamic analysis results. Based on this comparison it is demonstrated that the static prediction method is accurate enough for the radio network planning process. Example results of active set size, dominance and transmit power distributions from both simulators are presented.

Automated and remotely optimization of antenna subsystem based on radio network performance

3rd generation (3G) radio networks using WCDMA radio access technology will offer the customers services with higher bit rates than in nowadays 2nd generation networks. All users share the same frequency resource, therefore 3G networks are commonly believed to be interference limited. For this reason it is of utmost importance to exploit all possibilities in keeping the interference level as low as possible. One means for this, already used in 2G systems, is adjusting the downtilt of the antennas in a way, reducing the interference transmitted and received as much as possible, still ensuring the required coverage. In earlier studies it has been shown how careful radio network planning already in the preoperational phase can drastically increase 3G network performance. Optimal downtilt was found by applying a constant tilt to all cells in the network. The network consisted only of very high sites and therefore the gains of e.g. 40-50% in capacity were considered to be optimistic. The scope of the simulations for this paper therefore was to evaluate the gains in terms of capacity by optimizing the antenna tilt of WCDMA networks cell by cell in a more realistic environment, showing still gains of up to 20%.

An Enhanced Virtual Time Simulator for Studying QoS Provisioning of Multimedia Services in UTRAN

This paper describes an enhanced virtual time simulator for studying the provisioning of new services throughout the UMTS Radio Access Network (UTRAN). Several simulations were run to verify the feasibility of the tool and to investigate the effectiveness of the supported QoS mechanisms. The radio resources utilization is analyzed in terms of cell throughput and transmission power. The quality of experience is assessed separately for each of the offered services by tailored combinations of performance metrics, which determine the degree of satisfaction of the user of the services. The simulation results show the proposed simulator to be an appropriate tool for studying several aspects of radio network management, such as service planning and QoS provisioning.

Provisioning radio access networks for effective QoS management: capacity gains of service differentiation in UTRAN

The paper presents an effective QoS management framework with service differentiation for WCDMA networks. Performance results show the proposed set of radio resource management algorithms with differentiated parameters to be a reliable solution to sustain the quality of real time services offered on best effort, i.e. without any resource reservation or bit rate guarantees.

Mutual impact of two operators' WCDMA radio networks on coverage, capacity and QoS in a macro cellular environment

In 3/sup rd/ generation cellular systems using WCDMA radio access technology (RAT) one operator could theoretically operate its network by using only one frequency when another operator in the same area uses the immediate adjacent frequency. Then, on contrary to other systems, the adjacent channel interference (ACI) is coming entirely from another operator. Since most likely the network plans will be completely independent, the only means to combat this ACI is applying appropriate filters. This paper shows results on a study of the influence of 2 macro operators using WCDMA RAT in the same area in adjacent channels, by applying the filter values specified in 3GPP TS 25.101and 3GPP TS 25.104 . Two cases, one from an urban and one from a suburban area are shown. Example results on outage, coverage probabilities, quality of service, transmit power distributions etc. are presented with and without the second operator present and compared with each other. In conclusion of the comparison it is shown, that in macro cellular scenarios the influence of both operators on each other is negligible.

MÉTHODES ET PROCESSUS POUR LA PLANIFICATION DES RÉSEAUX RADIO WCDMA

This paper describes the system dimensioning and the radio network planning methodology for a third generation wcdma system. The applicability of each method is demonstrated using examples of likely system scenarios. The challenges of modeling the multiservice environment are described and the implications to the system performance simulations are introduced.RésuméCet article décrit la methodologie du dimensionnement et de la planification du réseau radio ďun systeme wcdma de troisième génération. On démontre que chacune des méthodes est applicable en utilisant des exemples vraisemblables de scénarios système. Les défis pour modeliser ľenvironnement multiservices sont décrits et les conséquences sur les simulations des performances système sont introduites.Cet article decrit la methodologie du dimensionnement et de la planification du reseau radio ďun systeme wcdma de troisieme generation. On demontre que chacune des methodes est applicable en utilisant des exemples vraisemblables de scenarios systeme. Les defis pour modeliser ľenvironnement multiservices sont decrits et les consequences sur les simulations des performances systeme sont introduites.