Automatic protection switching for p-cycles in WDM networks

Abstract

Abstractp-Cycle recovery relies on a protection switching protocol. We detail several issues for such a protocol taking the evolution from ring networks to p-cycles into account. In particular, we propose and evaluate a protocol enhancement to provide means for node failure protection. For the evaluation, we describe an integer linear program, which is applied to network design case studies, and formulate availability models for p-cycles. The case studies show that the protocol enhancement improves availability at marginal additional design cost.

Efficient optimization of network protection design with p-cycles

“…-Applications -In this category, authors try to implement p-cycles in networks with different design scenarios such as: multi-failures [5], node protection [6,7], path protection [6,8], and wavelength converter placement [9][10][11]. -Capacity design and modeling -Research in this category concentrates on resource allocation, p-cycle placement, and model formulation [12][13][14][15][16].…”

“…-Capacity design and modeling -Research in this category concentrates on resource allocation, p-cycle placement, and model formulation [12][13][14][15][16]. -Evaluation -Here, the focus is on evaluating the reliability of networks utilizing p-cycles [7,17].…”

“…Although, encircling p-cycles can protect a network from node failures, the p-cycle capacity is high if there are a larger number of transiting traffic streams [7]. The 'path segment-protecting p-cycle' or 'flow-p-cycle' is another concept introduced by Shen et al [6].…”

“…In this context, flow-pcycles can be more efficient than p-cycles and can protect the network against both link and node failures. According to [6,7], 'flow-p-cycles' have a limitation as they do not have the "simplicity of failure detection and protection switching by the node adjacent to the failure", and thus, switching nodes are required [7]. The study of p-cycle configuration with partial wavelength converters by Tianjian Li et al [11] in both cases of joint and non-joint optimization 1 shows promising results, which take into account the full advantages of wavelength converter sharing.…”

New results for path-based shared protection and link-based Hamiltonian cycle protection in survivable WDM networks

“…Recently, some work [4][5][6][7][8][9] proposed the p-cycle protection scheme, including the link-based Hamiltonian cycle protection (LBHCP) [10][11][12], which can perform ring-like restoration and mesh-like resources efficiency. In LBHCP, each demand will only be assigned to one working path since all working paths can be protected by a common Hamiltonian cycle; that is, all demands can share the backup resources on the Hamiltonian Cycle.…”