Availability-aware design for generalized MPLS networks

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The Internet service subscribers, including both enterprises and general end users, expect for high availability of Internet connections from their service providers. Guarantee of end-to-end (E2E) availability for each connection in dynamic Generalized Multi-Protocol Label Switched (GMPLS) networks has been an attractive design objective. The previous research work in the related areas has focused on development of survivable routing schemes for single or dual simultaneous failures under a given type of protection. However, as the state-of-the-art communication carrier networks evolve to a multi-service bandwidth provisioning environment, the E2E availability of each LSP has become a major performance index for achieving Quality-of-Service (QoS) guarantee percieved by the end users. This fact has imposed a fundamental impact on the development of survivable routing and spare capacity allocation schemes since the end users may not care about how many simultaneous failures the carrier can handle, and what type of protection scheme the carrier adopts. Driven by the observations, this project is committed to work on a general availability-aware service provisioning architecture in GMPLS networks for both real-time and non real-time services, where the long-term and short-term E2E availability of each connection will be defined and manipulated. Based on the availability models, the corresponding enhancement on the reported survivable routing and spare capacity allocation schemes will be investigated. The proposed research is envisioned to provide a complete solution to survivable routing problems by leaving some of the previous design issues, such as "how many simultaneous failures the carrier can handle", and "what type of protection scheme we had better adopt", no longer as problems. Such survivable routing architecture is expected to better fit into the design requirements of modern communication carrier networks where service availability is the ultimate goal of redundancy investment and survivability guarantee. The project will also lead to HQP training in availability analysis and optimization techniques, which will greatly contribute to the Canadian communication industry.