A mixed connection recovery strategy for surviving dual link failure in WDM networks

Self Cite

Survivability in the geographically distributed backbone multi-domain optical networks (MDONs) is critical because of issues related to its size, usage of resources, and domain management policies of the comprising domains. In MDONs, the emerging scheduled traffic is increasingly multivendor, multimedia, and periodic. It is high during the office (working) hours and low during the non-office (non-working) hours in a day. A connection failure during the office hours may result in huge amount of information being lost. Towards providing an acceptable level of service even when a connection fails, we first provide traffic balancing (TB) based solutions where the intra/inter-domain traffic is slided (S1-TB), shifted (S2-TB), or slided as well as shifted (S3-TB) based on the service level agreement between the client and domain service provider. Of the above solutions, the solution based on sliding as well as shifting (S3-TB) performs best, and hence for further improvement in S3-TB, we incorporate backup multiplexing with advance backup resource reservation (BRR) and evaluate the performance of the strategy and report results. The performance evaluation of the above strategies is compared with the existing extended path shared protection (EPSP) by a simulator developed in MATLAB and tested on three-domain and five-domain standard network topologies, on the metrics of blocking probability, network resource utilization ratio, network capacity utilized by backup route, wavelength link used per backup lightpath, and a newly introduced metric, network resource utilization index. As compared with the existing strategy EPSP, the S3-TB and S3-TB with BRR showed improved performance on all the metrics. branch office to the head office, and scientific data movement at some specific time and duration or the unspecified time and specified duration. [1][2][3][4][5] In literature, the time specific traffic is known as scheduled traffic (ST). 6 The ST connection request is of three types such as scheduled lightpath demands (SLDs), 7-9 sliding SLDs (SSLDs), 10,11 and delay tolerant (DT) traffic demands/requests. 4,5 If the setup and tear-down time of connection requests is fixed and known a priori, it can be referred as SLDs. If the starting and ending time of window within which a demand is to be scheduled is known, the traffic can be referred to as SSLDs, whereas the connection requests which allow some tolerable delay comprise the DT traffic. The SLDs raise new challenges and opportunities in MDONs due to domain diversity, lack of global information (such as network topology, routing, and resource availability), wavelength continuity, time clashing (overlapping), and time-disjoint constraints. To serve the SLDs, time-aware routing and signaling is essential. This time-aware routing and signaling is managed and controlled by switching network and control plane such as automatically switched optical network 12,13 and generalized multiprotocol label switching. 14-16 The automatically switched optical networks and generalized multipr...

Section: Simulation Results and Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Survivability using traffic balancing and backup resource reservation in multi‐domain optical networks

Batham

Yadav

Prakash

2018

Self Cite

“…The time windows consist of office hour (ie, window B) and non‐office hour (ie, windows A and C). The term BP is defined as the ratio of blocked connection requests to the total number of requests arriving in the network . Lower BP means the number of connections established in the network is higher.…”

Section: Simulation and Results Analysismentioning

confidence: 99%

“…The term BP is defined as the ratio of blocked connection requests to the total number of requests arriving in the network. 49 Lower BP means the number of connections established in the network is higher. The higher the number of connections established, the higher is the revenue generated for the SP.…”

Section: Simulation and Results Analysismentioning

confidence: 99%

Efficient resource provisioning using traffic balancing in multidomain optical networks

Batham

Yadav

Prakash

2016

Self Cite

Summary In multidomain optical networks (MDONs) the emerging multimedia, multivendor applications–based scheduled traffic (ST) is periodic and repeated day by day. The traffic is heavy during the working hours and slack during the non‐office hours. This results in the scarcity of network resources during the working hours, leading to the increased blocking of requests, even though there remains relatively large underused capacity during the non‐office hours. To use the network resources uniformly and efficiently, the demands may be slided within or shifted along the time zones/windows. In this paper, we first propose a heuristic algorithm, time‐aware routing and wavelength assignment (TA‐RWA), which allocates resources without traffic balancing (TB) for the ST in MDON. Time‐aware routing and wavelength assignment policy is then used as a benchmark for comparison with the 3 different TB solutions (named as P1‐TB, P2‐TB, and P3‐TB), in which the network load is redistributed by rescheduling the intradomain and interdomain demands. We performed extensive simulation experiments in MATLAB environment and compared the proposed policies with the existing ordering policies. From the results, it can be inferred that the proposed TB policies outperform the TA‐RWA, and the existing strategies of the blocking probability, resource utilization ratio (RUR), and percentage of intradomain and interdomain connections established. The best performance is achieved using P3‐TB strategy, in which requests are slided within, and shifted, along different time windows. The strategy shows about 70% reduction in the percentage blocking probability with respect to the TA‐RWA and the existing strategies.

“…Ferdousi et al attempted to accommodate incoming traffic demands by upgrading channel capacity from 10 Gbps (single-line rate) to 10/40/100 Gbps (mixed-line rate) with only few service interruptions. 30,31 Because of the complexity of failure cases, most papers consider the scenarios with 2 failures. Several schemes migrate fixed grid optical networks to flexible optical networks to provide a more suitable and compact channel for data flows.…”

Section: Related Workmentioning

confidence: 99%

Upgrading service availability of optical networks: A labor force perspective

Chang

Wang

2018

Service availability is an important issue in optical networks. Much research attention has been drawn to the provisioning of reliable connections achieved by approaches such as routing and wavelength assignment and by protection and restoration mechanisms. In contrast, the research on upgrading networks to meet new or dynamic demands of service availability based on network upgrading process has been comparatively lacking. In this paper, we address this issue by upgrading service availability from the perspective of labor forces for network maintenance. Our approach is premised on the assumption that the time period for fixing an optical link can be reduced by using more network resources of labor forces. To model this concept, we conduct Amdahl's law, a well-known theorem in parallel computing, to describe human teamwork. To show the effectiveness of this concept, we propose mixed integer linear programming aiming at either maximizing service availability under limited labor forces or minimizing labor forces for predetermined service availability. In addition, a heuristic algorithm for upgrading service availability is presented.Our experimental results show that our network upgrading process can improve service availability optimally with a fixed number of forces and the proposed heuristic algorithm can effectively save computation time.