Scheduling Algorithm Design And Performance Evaluation In UMTS/EUMTS

In this paper, we perform a system-level simulative evaluation of Universal Mobile Telecommunications System (UMTS) with multi-service via Network Simulator 2 for a newly built scenario. We change the scenario environment parameters, such as link delay, speed of User Equipment (UE) and interference traffic rate, to show how diverse services are affected. The results with respect to bandwidth, end-to-end delay, handoff latency, packet loss and delay jitter are presented to provide thorough investigation of UMTS. Additionally, we discuss the impact of co-channel interference and compare the performance in the situation with and without interference. Based on the results from simulations, we have drawn conclusions that end-to-end delay and handoff latency are not severely influenced by the high value of link delay and the number of packet loss is not directly related to link delays or UE's speed. Moreover, UE's speed does not affect the performance obviously. Then we present three new scheduling algorithms, namely Prioritized Fair Channel-Dependent Scheduling (PFCDS), Prioritized Adaptive Fair Scheduling (PAFS) and Controllable Prioritized Adaptive Fair Scheduling (CPAFS), respectively. The performance evaluation of those three algorithms under Enhanced UMTS (EUMTS) in urban pedestrian situation is provided. From the numerical analysis, we can deduct that the performance of PFCDS, including capacity adaptability, throughput and end-to-end delay, is better than those traditional algorithms, such as RR, C/I, PCI. However, the adapatability performance of PAFS and CPAFS is even better. Furthermore, CPAFS can help EUMTS to meet complicated desire of Quality of Service (QoS), via altering the outer parameter.