1 Department of Photonics Engineering, Technical University of Denmark2 Networks Technology and Service Platforms, Department of Photonics Engineering, Technical University of Denmark3 Copenhagen Center for Health Technology, Center, Technical University of Denmark
This thesis addresses selected topics of Quality of Service (QoS) provisioning in heterogeneous data networks that construct the communication environment of today's Internet. In the vast range of protocols available in different domains of network infrastructures, a few chosen ones are discussed and their key QoS features are analysed. This thesis mainly focuses on home and access networks, and their interaction. Considering home networks, UPnP-QoS Architecture was chosen in order to analyse the possibilities of QoS provisioning at users' premises using service oriented architectures. First, the general UPnPQoS performance was assessed analytically and confirmed by simulations results. The results validate the usability of UPnP-QoS, but some open issues in the specication were identified. As a result of addressing mentioned shortcomings of UPnP-QoS, a few pre-emption algorithms for home gateway were designed and compared. Similarly as for general UPnP-QoS assessment, analysis and intensive simulations were used for verification of proposed pre-emption techniques. The other proposed extension for UPnP-QoS was an integration of trac auto-classication within UPnP-QoS Architecture. Simulation results of this extension showed the potential of this method in QoS preservation for scenarios where UPnP non-compliant devices are present in home networks. With well defined ideas about home QoS, the interdomain aspects of QoS provisioning were addressed. For access network control the Generalized Multi-Protocol Label Switching (GMPLS) protocol suite was selected. Its growing popularity in access networks together with its maturity and wide adoption in core networks, makes it a great candidate as an end-to-end QoS provisioning mechanism. As a consequence of the UPnP-QoS/GMPLS mapping analysis and design, an OSGi-based interface was developed. It allows integrated QoS establishment, initiated by UPnP-QoS Control Point and conguring home devices, then passing the Home Gateway, and nally triggering Label Switching Path establishment in the access network. To depict the versatility of the GMPLS suite and discuss also access Passive Optical Network (PON) technologies, a GMPLS controlled Ten Gigabit Passive Optical Network (XGPON) was proposed. This part of the thesis introduces the possibility of managing the XG-PON by the GMPLS suite, showing again that this protocol suite is a good candidate for an integrated QoS solution. Additionally, one can notice that such a GMPLS controlled XG-PON could be connected with UPnP-QoS/GMPLS interface and GMPLS core, which is presented in this thesis, and which enables the end-to-end QoS also over PON links. The final part of the thesis treats generalised concepts of resource reservation that could be used in core networks. Teletraffic engineering theorems are used for management of resources reserved for traffic of different priorities and rates in nodes, open and closed networks. As a whole, this thesis can be seen as a QoS analysis starting from home networks through Home Gateways towards access links and finally reaching core networks - in this way constituting a path with end-to-end interdomain provisioned QoS.