ON 4.7.1 Basics of the Optimisation process Core network optimisation focuses on both switch and signalling network optimisation. The process starts with the defining of key performance indicators (KPIs) along with data collection. This is then followed by analysis of the data. A performance analysis is done for both the switches and signalling. In some cases, the transmission network (for the core) and other aspects such as IN may be included and their effects on the core network might also be included. Analysis of the network and data might bring to light some bottlenecks, and lead to suggestions for a network upgrade, or parameter tuning. These corrections are then made/suggested in the final core network optimization plan for implementation (see Figure 4.11). Data Collection Final CN Definition Optimisation Plan Analysis Figure 4.11 Core network optimisation process Any information that is relevant to the quality of service of the network can be considered to be part of the key performance indicators. This may include parameters related to traffic and signalling performance, and measurements related to HLR, VLR and other network elements in the core network. Data can be collected by using test equipments, by using counters on the NMS, or by means of other measurements/reports from the network. CORE NETWORK PLANNING AND OPTIMISATION 4.7.2 Data Collection and Analysis Data Collection: Switching In Chapters 2 and 3, we have seen that data on the existing network topology is required. Similarly in core network optimisation, data on the existing network topology should be collected and analysed. This mainly consists of information about existing network elements in the core network and interconnections between them (as this will be the basis of routing analysis and optimisation). Optimisation in the core network is dependent mainly on traffic measurements, which is also the most critical input for the whole process. The data generally contains information such as cell measurements, traffic category measurements, m