Availability model for group shared path protection in wavelengths division multiplexing networks

Survivability is an important issue in Wavelengths Division Multiplexing (WDM) networks. Many protection techniques have been proposed to improve the network survivability. Among them, Group shared path protection (GSPP) is taken as a good candidate to balance the capacity efficiency and the network performance. By GSPP the working paths are grouped into different protection groups as long as the working paths are link-disjoint. The spare capacity inside each group can be shared among the protection paths of the working paths.; In this thesis, an availability model to evaluate the connection availability for GSPP is presented considering both the single failure and dual failures. The general networks are exploited and two commonly used routing algorithms, adaptive routing (AR) algorithm and Integer Linear Programming (ILP) algorithm are employed to implement GSPP. It is concluded that the availability for GSPP is affected by the number of links in each connection and the number of working paths within each group. Using ILP to implement GSPP, the network uses fewer resources than using AR, however, ILP suffers from the scalability problem with the network expanding or the traffic rising.