Performance Analysis of VoIP over HSDPA in a Multi-cell Environment

This paper describes network level simulation results for VoIP and Best Effort traffic running over HSDPA. The main focus involves an analysis of how the system is able to deal with user mobility, and in particular handover. Both a handover threshold level as well as a handover setup delay have been included in the simulation model, and a discard timer is used to remove outdated packets from the Node B queue. Link adaptation and H-ARQ (Hybrid-Automatic Repeat reQuest) functionalities are also included in the simulator. An infinite multi-cell environment has been modeled and the users are assumed to move at vehicular speeds. A performance analysis will show the end-to-end QoS. The handover threshold, delay and discard times are also varied in order to investigate their impact on the performance.