Part Five
Simulation-Based Evaluation for Wireless Systems
Introduction
This last part of the book is devoted to system-level results based on simulators as explained in more detail in Part Four. In Chapter 13 we show in the example of High-Speed Downlink Packet Access (HSDPA) how difficult and at the same time how complex such simulations are. The proposed system-level model as defined in Part Four serves as the core for the development of a system-level simulator. First, the concept of the system-level simulator, including its advantages and limitations, is explained. Then, network performance prediction results from a set of Double Transmit Antenna Array (D-TxAA) system-level simulations are presented and discussed. The statistics obtained of the average user throughput to fairness measures are related to each other and different network setups by means of their average, and maximum sector throughputs are compared. Also, briefly, the consequences of the double-stream operation on the fairness in the network are discussed. Consequently, a novel Radio Link Control (RLC)-based stream-number decision algorithm with enhanced robustness against signaling errors from the User Equipment (UE) side is proposed. The system-level simulator is also utilized to conduct performance evaluations of an optimized cross-layer scheduler, and the achievable Quality of Experience (QoE) gains in an HSDPA network are investigated. Finally, by extending the proposed system-level model, Common Pilot ...
