Thesis for Degree of Master of Engineering Differentiated Optical QoS Service Framework in Next Generation Optical VPN

VPN is an enterprise network based on a shared public network infrastructure but providing the same security, management, and throughput policies as applied in a private network. The primary advantages of "VPN over Internet" are cost-effectiveness and flexibility while coping with the exponential growth of Internet. However, the current disadvantages are the lack of sufficient QoS and provision of adequate transmission capacity for high bandwidth services. For resolving these problems, OVPNs over the next generation optical Internet (NGOI) have been suggested. Keeping in mind that IETF and ITU-T are standardizing IP/generalized multi-protocol label switching (GMPLS) over dense-wavelength division multiplexing (DWDM) as a solution for the NGOI, DWDM optical network technology will be used as the NGOI backbone and GMPLS will be used as control protocols for transferring data over IP. Therefore, an OVPN over IP/GMPLS over DWDM is considered as a major trend for next generation VPNs supporting various real-time multimedia services. Within this architecture, providing QoS guaranteed multimedia services with differentiated QoS guarantee and QoS recovery are the key issues. In this paper, we suggest O-LSP establishment and its QoS maintenance scheme based on differentiated optical QoS classes. The suggested scheme considers technologies such as the DWDM optical backbone network, the GMPLS control protocol, OVPN, and QoS.