Research On Multi-granular QoS Control And Mobility Management In SUPANET

IPv6, proposed in mid 90's last century, has been widely viewed as the thesaurus of NGI (Next Generation Internet). However, IPv6 cannot meet the challenges faced with Internet simply relying on existing architecture, such as high-speed switching, guarrenteed QoS, security, reliability and manageability, and mobility. Academic communities and industry have started to turn from the standpoint of "IPv6 is the NGI" only after GENI declared in 2006 that the Internet built more than 30 years ago had become the main constraints in NGI development and needed a clean slate architecture. Nevertheless, there is still no international agreement in academic circle on what is the clean slate architecture.Sichuan Network Communication Technology Key Laboratory at Southwest Jiaotong University has been devoting its efforts on architecture of NGI since its foundation in 2001. In view that future backbone network will be based on DWDM and in access networks diverse technologies including wireless communication technique have to be used, most unlikely a unilifed layering structure can be applied univeserly as before. Consequently, the development strategy of BSF-OES (Backbone Substrate First, Outwards Extension Second) for NGI was proposed. In 2003, the Lab Introduced the 3D-EMAN (Three dimensional Ethernet-oriented MAN) and renamed it as SUPA (Single-layer User-data switching Platorm Archiecture) for all backbone networks. The goal of SUPA is to build a high-efficienct and high speed subnetwork with security and guarrentteed QoS. SUPA separates the high-speed switching functions for user-data from those for control and management with out-of-band signaling concept so as to reduce the U-platform (User-data switching platform) into a single layer. SUPANET provides a connection oriented VLS (Virtual Line Switching) service. As a backbone subnetwork, it encapluates frames, packets, and other forms of application data from any access network (Internet, Ethernet, wireless networks, and etc.) and transmit via its virtual tunnels with secured and multi-granular QoS nature.The work presented in this thesis was based on the framewaork of SUPA, especially on those relevant to QoS provisioning in the laboratory. It has been dedicated to two main areas: control mechanism for multi-granular QoS and mobility management when Internet and heterogeneous wireless networks act as access network of SUPANET with QoS enabled functionality.The main work and contributions are as follows:(1) To address the issue how to support multi-granular QoS based on original mechnanisms of SUPANET, the Virtual Tunnel (VT) oriented QoS mechnanisms of SUPANET were analyzed at first, Fine Granularity Virtual Tunnel (FGVT), Average Datarate Guaranteed Coarse Granularity VT (ADG-CGVT) and Best Effort Coarse Granularity VT (BE-CGVT) were defined, formed the Multi-Granular Vitrual Tunnel (MGVT) mechanism. Then, the mapping mechanism between traffic flow and MGVT was researched and a resource adaptive algorithm (RAA) of CGVT was proposed. Simulation results show that RAA of CGVT can improve resource utilization rate effectively. Finally, the multi-granular QoS guarantee framework of SUPANET was proposed.(2) To address the issue how to support mobility management based on the multi-granular QoS guarantee mechanism when SUPANET interconnected with Internet, the VT handover method onf MGVT was designed at first.In the research works of FGVT handover, three VT handover methods, Virtual Tunnel Rebuilding (VTR), Virtual Tunnel Extension (VTE) and Extension First Rebuilding Second (EFRS) were proposed. The simulation results show that, EFRS has better performance than VTR and VTE. Finally, on the analysis of MIPv6, FMIP and SIP-based mobility management, the integration mechanisms of VT handover with the MIPv6, FMIP, and SIP mobility were researched.(3) To address the issue how to support mobility management based on the multi-granular QoS guarantee mechanism when SUPANET interconnected with heterogeneous wireless network, QoS weights of 3GPP business classes were analyzed using Analytic Hierarchy Process (AHP) at first, the Differentiation Weighted Network Selection Algorithm (DWNSA) for network selection was designed. Simulation results show that DWNSA is better than average weight algorithm on deciding target network reasonably and balancing network loads efficiently. Then, a Resource of Virtual Tunnel based DWNSA (RVT-DWNSA) was proposed, and multi-granular VT parameters were defined. Finaly, the efficiency of the RVT-DWNSA is verified by simulation.(4) Finally, based on the analysis of mobility management framework for NGN defined by ITU-T, the mobility management framework in multi-granular QoS guarantee mechanism SUPANET was proposed, the location management functions and handover control functions were defined also. The end-to-end seamless handover procedure in multi-granular QoS guarantee mechanism was designed based on this framework.This research work has filled the gaps of multi-granular QoS guarantee and mobility management in SUPANET, it is an important component of SUPANET framework and provides strong support to other research work which takes SUPANET as the backbone of NGN.