Abstract:

A new pre-configure cycle (p-cycle) algorithm named unidirectional p-cycle is proposed when considering the single span failure in mesh networks with directional capacity. Unidirectional p-cycle includes clockwise and counterclockwise p-cycle by adding direction to traditional p-cycle. The new evaluation criteria and approach for determining and configuring candidate p-cycles according to the proposed algorithm are presented. Extensive simulations show that the proposed unidirectional p-cycle outperforms conventional p-cycle algorithms in mesh networks with directional capacity in terms of protection success ratio, protecting capacity proportion and protecting capacity utilization.

Key words: mesh networks with directional capacity, wavelength division multiplexing, recovery, unidirectional p-cycle, asymmetry degree