ffic for mobile networks. The Traffic Module is a logical layer with visible nodes including: BTSs, BSCs, MSCs and their 3G equivalents and their logical connections. Other service network layers are: TETRA, PSTN Access, Interswitch, and SS7 signalling. The main driver for creating IP and ATM modules is the increasing importance of packet-based networks. Most of the modern data services are implemented in the various packet-switched networks and the IP module was created to provide a means of modelling these. In addition to well-established packet networks that are based on IP or ATM packet networks, Nokia's aim is to provide a basic transmission capacity dimensioning tool both for GPRS networks and eventually for third-generation mobile networks. The IP module is used to define traffic demands for an IP network. As planning results, equipment capacities and estimates of the network usage are provided. The IP module can provide valuable information about bottlenecks in the network and easy ways to solve them with the user-friendly graphical interface. It provides an easy way to estimate packet throughputs; and to give more realistic results, packet loads of equipment and protocol overheads can be included in the capacity calculations. IP traffic can be easily routed to lower transport layers such as ATM, SDH or PDH and the required capacities on those layers can be analysed in corresponding modules. QUALITY PLANNER Figure A.6 Drive-test results analysis using Quality Planner A.6 QUALITY PLANNER It is essential that mobile network operators measure the performance of the radio net- work and carry out optimisation of the system. Only by making field trial measurements are operators able to determine the performance of the radio network as seen by sub- scribers. Quality Planner provides an automated analysis of the test mobile measurement files and produces diagnostic reports to resolve problems within the radio network (see Figure A.6). Quality Planner is an efficient and flexible solution for analysing GSM network