Research On Key Techniques Of MPLS CAC

Quality of Service (QoS) is one of the most active research areas in networking. In an attempt to address the growing needs of applications, organizations such as ITU-T and IETF put forwarding into QoS research and proposed the structure of Integrated Service(IntServ), Differentiated Service(DiffServ) and Multiple Protocol Label Switching(MPLS) QoS. But the MPLS QoS is the only structure that was supported by the two organizations. This is mainly because MPLS have many special characteristics, including: (1) MPLS technology imports connection mechanism into non-connection IP network, realized one routing, multiple switching, remaining the routing flexibility and exerting the high speed of switching; (2) MPLS can be realized on diverse layers from physical layer to TCP layer and meets the use demands from Data Link Layer (DLL) to Application Layer (AL). The real scenario is anything over MPLS and MPLS over anything at present; (3)MPLS primely supports the key technologies such as QoS, VPN(Virtual Private Network), Traffic Engineering (TE), IPv4/IPv6 coexistence, multicast, etc. and provides integrated solving projects; (4)MPLS can be deployed at edge and can be expanded at core, according with the Internet developing. Therefore, MPLS was popular just from its appearance, and has been widely used in wireless network, LAN/PAN/MAN/WAN, optical network, satellite network and mobile network. Main network equipment providers and academic organizations research and develop the MPLS technology with huge capital and many people. Network equipments with MPLS function are the fundamental requirement of advanced network equipments and network applications.Call Admission Control or Connection Admission Control (CAC) technology is the basic function opponent of MPLS LSP and MPLS TE. CAC is the most active research areas in QoS at all times. CAC has two targets: (1) guaranteeing the all present QoS links; (2) effectively improving the usage of network resource. The main technologies of CAC can be classified to distributed CAC technology, centralized CAC technology and policy-based CAC technology. These CAC technologies can be realized in the MPLS network on demand, and can be integrated into other technologies to construct whole QoS settlement.The main research in this thesis surrounds the CAC realization mechanism of the MPLS LSP and MPLS TE, and the major contributions of this thesis include:1. To predict the network traffic precisely, we propose measure-based self-similar network traffic prediction algorithm (HSS-MBP). Self-similarity is the fundamental character of network traffic. The following of the thesis are mainly based on HSS-MBP. Through analysis and simulations, it shows that HSS-MBP has better prediction data with less computing. 2. To adjust the traffic at the node, we propose Measure-based Self-Similar CAC algorithm (HSS-MBAC) and Adaptive Measure-based Self-similar CAC algorithm (HSS-AMBAC).The algorithms predict the self-similar traffic and adjust it adaptively, traffic prediction is more precise and timely. Through analysis and simulations, they shows higher admission ratio under the same bandwidth.3. Referring to the inherent character and realization mechanism of MPLS LSP, we propose Label-based Probability Admission Control algorithm (LB-PAC). Avoiding the limitations of the End-point Admission Control algorithm and End-to-end Admission Control algorithm without increasing the complexity of LSP setup, LB-PAC utilizes MPLS LSP realization mechanism. According to the time sensitive application and bandwidth sensitive application, various probability admission control algorithm are proposed. Through analysis and simulation, the algorithms have higher admission ratio.4. The price of QoS is sensitive problem of ISP and users. Pricing mechanism is imported to the MPLS DS-TE and Price-based MPLS DS-TE algorithm (UB-MDTAC) is proposed. The algorithm balances the network usage of ISP focus and the price demand of users, and get better admission ratio under MPLS DS-TE.5. To meet the demand of flexible deployment of CAC, the policies of Policy-based Admission Control (PBAC) algorithm are analyzed and two models (MPBMC/MMPBMC) are proposed to meet the realization of PBMC in MPLS network.