In this paper, we propose a novel routing, core, and spectrum assignment (RCSA) algorithm based on inter-core spectrum crosstalk measurement with dedicated path protection (RCSA-IC-SCM). We also introuduce two other RCSA algorithms with the no inter-core spectrum crosstalk measurement (RCSA-noIC-SCM) and traditional inter-core spectrum crosstalk measurement (RCSA-TIC-SCM) for comparison. Compared with other traditional RCSA algorithms, simulation results demonstrate that our proposed RCSA-IC-SCM algorithm achieves a better performance in terms of average inter-core crosstalk, blocking probability, and spectrum occupation ratio in spatial division multiplexing elastic optical networks (SDM-EONs).
We investigate the maximized cross-layer reliability under arbitrary link failure probability in multilayer optical networks. A concept of minimal cross-layer cutset is first defined and a reliability model with arbitrary physical link failure probability is built in the multilayer optical networks. In order to reduce the scale of cutset enumeration, we introduce two metrics to estimate cross-layer reliability, i.e., the minimum cross-layer node reliability and the minimum cross-layer edge reliability (MCER). Furthermore, we develop two linear programming (LP) models and two heuristic algorithms to maximize the cross-layer reliability of multilayer optical networks, i.e., the minimum shared-risk mapping algorithm and the least shared failure probability algorithm. Simulation results show that: (i) the cross-layer reliability of the two proposed algorithms is close to the LP solutions under logical networks with different sizes, which achieves better results in terms of additional resources utilization compared with the shortest path algorithm; (ii) less difference between the results of our proposed algorithms and the results of the shortest path algorithm is accompanied by a small standard deviation of failure probability distribution. Moreover, the superiority of our proposed algorithms becomes more remarkable with the increasing of the standard deviation.
A multilink failures model, i.e., probabilistic-shared risk link group (PSRLG), is adopted to investigate the problem of differentiated quality-of-protection (QoP) provisioning for flexi-grid optical networks. As a metric, service failure probability (SFP) is introduced to exactly examine the feasibility of differentiated QoP schemes, which denotes the failure probability of a connection during transmission. According to different reliability requirements, connection requests are divided into three classes, i.e., class high, class middle, and class low. Then two differentiated QoP provisioning schemes are proposed based on the class division, i.e., intraclass-shared resource scheme (ICSR scheme) and cross-class-shared resource scheme (CCSR scheme). The former allows a connection to share backup resources only with those connections in the same class, whereas the latter enables the connections in different classes to share backup resources. Simulation results show that our proposed schemes could well provide differentiated reliability with PSRLG constraint and achieve a good balance between reliability and resource efficiency. Moreover, the CCSR scheme achieves lower blocking probability, lower resource redundancy, and higher spectrum utilization without sacrificing reliability compared to the ICSR scheme.
In this paper, a novel survivable algorithm with dynamic load balancing shared-path protection is proposed, named
DLBSPP algorithm, in spectrum-elastic optical path networks (SLICE). To tolerate multi-link failures in SLICE, traffic
self-adaptive restoration (TSAR) mechanism is adopted to restore the traffic affected by the failures. Simulation results
show that, compared with the conventional SPP algorithm, DLBSPP algorithm has lower blocking probability (BP),
better spectrum utilization ratio (SUR) and higher failure restoration ratio (FRR).
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