A Delay Optimal Scheduling Policy for Real Time Services in WCDMA Systems

Authors:
Dimitrios Komnakos;Dimitrios N. Skoutas;Demosthenes Vouyioukas;Angelos Rouskas
Affiliations:
School of Electrical and Computer Engineering, National Technical University of Athens, Zographou, Greece 15780;Department of Information and Communication Systems Engineering, University of the Aegean, Samos, Greece 83200;Department of Information and Communication Systems Engineering, University of the Aegean, Samos, Greece 83200;Department of Digital Systems, University of Piraeus, Piraeus, Greece 18534
Venue:
Wireless Personal Communications: An International Journal
Year:
2011

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Abstract

Enhanced Uplink operation of WCDMA-UMTS systems utilizes fast Node B scheduling and a short Transmission Time Interval (TTI) of 2 ms. The scheduling decisions are based on Scheduling Information (SI) sent from each User Equipment (UE) to the Node B. The weakness of the existing scheduling framework is that the SI does not include information regarding the delay sensitivity of each traffic flow, as well as the actual delay that the buffered data have experienced, especially for real-time services. In this paper, we propose the inclusion of such information in SI by introducing modifications into the respective 3GPP specifications. Thus, we propose a Delay Aware Channel Prioritization (DACP) criterion optimized for real-time services. Furthermore, we propose a DACP-based packet Scheduler (DACP-S) which is able to dynamically manage the Enhanced Dedicated Channel's (E-DCH) transmissions and offer Quality of Service differentiation. The performance of the proposed scheme is evaluated by means of system level simulations.