Personal Communications Services (PCS) key objective is to provide ubiquitous communication services. The success of PCS will depend on the network resources to ensure the quality-of-service required by service subscribers. Performance evaluation studies of different system configurations and implementation alternatives will play a major role in the planning and dimensioning of successful PCS networks. In this study, we undertake the analysis of some implementation issues of a PCS architecture based on the IN system architecture. A system model and traffic scenarios taking into account the interconnection requirements of PCs to the PSTN are considered in the study. The overall system performance is evaluated in terms of utilization rate of the key network elements and the end-to-end response time of the signaling network for various IN services.