Scheduling support for mixed VoIP and web traffic over HSDPA
2007 (English)In: 2007 IEEE 65th Vehicular Technology Conference: 22 - 25 April 2007, Dublin, Ireland, Piscataway, NJ: IEEE Communications Society, 2007, 814-818 p.Conference paper (Refereed)
HSDPA (high-speed downlink packet access), introduced in WCDMA release 5, provides a high-bandwidth shared channel with short transmission time interval (TTI). The short TTI together with appropriate scheduling enable HSDPA to support efficient multiplexing of traffic. We explain the performance of four scheduling algorithms when transmitting a traffic mix consisting of both conversational (VoIP) traffic and background (Web) traffic over the high-speed downlink shared channel (HS-DSCH) of HSDPA. We consider both cell throughput and user satisfaction. The proportional fair (PF), the maximum rate (MR) scheduler and two extended versions of MR, are tested for different VoIP scheduling delay budgets and varying load. To understand the behaviour of the schedulers, we use the ns-2 simulator extended with a model of HS-DSCH to simulate a mixed traffic scenario. Our results show that a scheduler that gradually increases the VoIP priority and considers the user's current possible rate, performs well. A more drastic increase in VoIP priority is however needed when the delay budget is short. Furthermore, attempting to uphold quality for both VoIP and Web traffic makes the system sensitive to overload situations.
Place, publisher, year, edition, pages
Piscataway, NJ: IEEE Communications Society, 2007. 814-818 p.
, IEEE Vehicular Technology Conference (VTC) Proceedings, ISSN 1550-2252
Research subject Dependable Communication and Computation Systems
IdentifiersURN: urn:nbn:se:ltu:diva-35431DOI: 10.1109/VETECS.2007.177Local ID: 9f8173f0-8391-11dc-896e-000ea68e967bISBN: 1-4244-0266-2OAI: oai:DiVA.org:ltu-35431DiVA: diva2:1008684
IEEE Vehicular Technology Conference : 22/04/2007 - 25/04/2007
Validerad; 2007; 20071026 (saral)2016-09-302016-09-30Bibliographically approved