## Abstract

As a generalization of the traditional path protection scheme in DM networks where a backup path is needed for each active path, the partial path protection scheme uses a collection of backup paths to protect an active path, where each backup path in the collection protects one or more links on the active path such that every link on the active path is protected by one of the backup paths. While there is no known polynomial time algorithm for computing an active path and a corresponding backup path using the path protection scheme for a given source-destination node pair, we show that an active path and a corresponding collection of backup paths using the partial path protection scheme can be computed in polynomial time, whenever they exist, under each of the following two network models: (a) dedicated protection in WDM networks without wavelength i converters; and (b) shared protection in WDM networks without wavelength converters. Under each of the two models, we prove that for any given source s and destination d in the network, if one candidate active path connecting s and d is protectable using partial path protection, then any candidate active path connecting s and d is also protectable using partial path protection. This fundamental property leads to efficient shortest active path algorithms that can find an active path and its corresponding partial path protections whenever they exist. Simulation results show that shared partial path protection outperforms shared path protection in terms of blocking probability.

Original language | English (US) |
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Article number | ON08-4 |

Pages (from-to) | 1756-1760 |

Number of pages | 5 |

Journal | IEEE International Conference on Communications |

Volume | 3 |

State | Published - Sep 12 2005 |

Externally published | Yes |

Event | 2005 IEEE International Conference on Communications, ICC 2005 - Seoul, Korea, Republic of Duration: May 16 2005 → May 20 2005 |

## Keywords

- Backup multiplexing
- Partial path protection
- Polynomial time algorithms
- WDM networks

## ASJC Scopus subject areas

- Computer Networks and Communications
- Electrical and Electronic Engineering