Quality of service and resource management in IP and wireless networks

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Doctoral thesis (article-based)
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Report. Helsinki University of Technology, Department of Communications and Networking, 5/2009
A common theme in the publications included in this thesis is the quality of service and resource management in IP and wireless networks. This thesis presents novel algorithms and implementations for admission control in IP and IEEE 802.16e networks, active queue management in EGPRS, WCDMA, and IEEE 802.16e networks, and scheduling in IEEE 802.16e networks. The performance of different algorithms and mechanisms is compared with the prior art through extensive ns-2 simulations. We show that similar active queue management mechanisms, such as TTLRED, can be successfully used to reduce the downlink delay (and in some cases even improve the TCP goodput) in different bottlenecks of IP, EGPRS, WCDMA, and IEEE 802.16e access networks. Moreover, almost identical connection admission control algorithms can be applied both in IP access networks and at IEEE 802.16e base stations. In the former case, one just has to first gather the link load information from the IP routers. We also note that DiffServ can be used to avoid costly overprovisioning of the backhaul in IEEE 802.16e networks. We present a simple mapping between IEEE 802.16e data delivery services and DiffServ traffic classes, and we propose that IEEE 802.16e base stations should take the backhaul traffic load into account in their admission control decisions. Moreover, different IEEE 802.16e base station scheduling algorithms and uplink channel access mechanisms are studied. In the former study, we show that proportional fair scheduling offers superior spectral efficiency when compared to deficit round-robin, though in some cases at the cost of increased delay. Additionally, we introduce a variant of deficit round-robin (WDRR), where the quantum value depends on the modulation and coding scheme. We also show that there are several ways to implement ertPS in an efficient manner, so that during the silence periods of a VoIP call no uplink slots are granted. The problem here, however, is how to implement the resumption after the silence period while introducing as little delay as possible.
quality of service, resource management, active queue management, admission control, scheduling
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  • [Publication 1]: Jani Lakkakorpi, Ove Strandberg, and Jukka Salonen. 2005. Adaptive connection admission control for differentiated services access networks. IEEE Journal on Selected Areas in Communications, volume 23, number 10, pages 1963-1972. © 2005 IEEE. By permission.
  • [Publication 2]: Jani Lakkakorpi and Renaud Cuny. 2006. Comparison of different Active Queue Management mechanisms for 3G Radio Network Controllers. In: Proceedings of the 2006 IEEE Wireless Communications and Networking Conference (WCNC 2006). Las Vegas, Nevada, USA. 3-6 April 2006, volume 1, pages 80-85. © 2006 IEEE. By permission.
  • [Publication 3]: Renaud Cuny and Jani Lakkakorpi. 2006. Active Queue Management in EGPRS. In: Proceedings of the 63rd IEEE Vehicular Technology Conference (VTC 2006-Spring). Melbourne, Australia. 7-10 May 2006, volume 1, pages 373-377. © 2006 IEEE. By permission.
  • [Publication 4]: Jani Lakkakorpi, Alexander Sayenko, Juha Karhula, Olli Alanen, and Jani Moilanen. 2007. Active Queue Management for reducing downlink delays in WiMAX. In: Proceedings of the 66th IEEE Vehicular Technology Conference (VTC 2007-Fall). Baltimore, Maryland, USA. 30 September - 3 October 2007, pages 326-330. © 2007 IEEE. By permission.
  • [Publication 5]: Jani Lakkakorpi, Alexander Sayenko, and Jani Moilanen. 2008. Comparison of different scheduling algorithms for WiMAX base station: Deficit Round-Robin vs. Proportional Fair vs. Weighted Deficit Round-Robin. In: Proceedings of the 2008 IEEE Wireless Communications and Networking Conference (WCNC 2008). Las Vegas, Nevada, USA. 31 March - 3 April 2008, pages 1991-1996. © 2008 IEEE. By permission.
  • [Publication 6]: Jani Lakkakorpi and Alexander Sayenko. 2008. Backhaul as a bottleneck in IEEE 802.16e networks. In: Proceedings of the 2008 IEEE Global Telecommunications Conference (GLOBECOM 2008). New Orleans, Louisiana, USA. 30 November - 4 December 2008, pages 1-6. © 2008 IEEE. By permission.
  • [Publication 7]: Jani Lakkakorpi and Alexander Sayenko. 2009. Measurement-based connection admission control methods for real-time services in IEEE 802.16e. In: Proceedings of the Second International Conference on Communication Theory, Reliability, and Quality of Service (CTRQ 2009). Colmar, France. 20-25 July 2009, pages 37-41. © 2009 IEEE. By permission.
  • [Publication 8]: Jani Lakkakorpi and Alexander Sayenko. 2009. Uplink VoIP delays in IEEE 802.16e using different ertPS resumption mechanisms. In: Jaime Lloret Mauri, Joseph A. Meloche, Sergey Balandin, Malohat Ibrohimova, and Junya Nakata (editors). Proceedings of the Third International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies (UBICOMM 2009). Sliema, Malta. 11-16 October 2009, pages 157-162. © 2009 IEEE. By permission.