Research On Radio Network Planning In Mobilecommunacation System

The present thesis introduces the radio network planning process for WCDMA (FDD mode), as defined by 3GPP and DAS (Distributed Antenna System) capacity-related issues is studied and analyzed. This thesis consists of three parts: introduction of basic principles for radio network planning, process for WCDMA network planning and research on DAS-related issues. General challenges to face in 3G network control are based on the fact that many issues are interconnected and should be simultaneously considered, such as:Planning means not only to meet current status and demands, but the solution should also comply with the future requirements by providing an acceptable development path.Traffic modeling is not only the question about the total amount of traffic growth, but also the question about the future service distribution and performance demands. All CDMA systems have a relation between capacity and coverage.Consequently, the network planning itself is not only based on propagation estimation but also on the interference situation in the network. Ideally, site selection consideration will be done based on the network analysis with planned load and traffic/service portfolio, taking possible co-site constraints into account. Provision of multi-services and seamless management of at least two multiple access systems require rapid evolution of the management tools and processes. The network performance in term of capacity, quality, and implementation and operational costs forms a multi-dimensional space. The contribution of this thesis is as follow: The network planning related factors such as traffic models, propagation model and radio link budget, QoS, and the method of capacity dimensioning are outlined and analyzed.A novel approach to WCDMA multi-service dimensioning for WCDMA is proposed. The effect of power control error and soft handover on capacity dimensioning is taken into account in the method. Closed-form expression for outage probability is also given.Based on a Nakagami/Lognormal composite fading channel model, parameter dependence and system performance improvement on different DAS approaches are reviewed. Capacity-related issues such as outage probability, outage capacity and antennas selection based ergodic capacity for DAS are studied and simulation results are presents and analyzed.