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A regional fault-tolerant restoration mechanism based on SDN is proposed for fiber communication networks. Simulation results show that this mechanism has shorter recovery time and lower restoration failure rate than other mechanism because of avoiding the occurrence of regional faults.
In order to virtualize the optical resources and support as required, software-defined optical networks (SDON) can dynamically customize the structure and function of the optical network using the software programming method according to the requirements of the users and operators. Each layer in SDON architecture has a lot of core technology. In this paper, we focus on the dynamic scheduling and optimization...
With the development of passive optical networks (PONs), to cache videos on optical network units (ONUs) is now considering as an efficient scheme for better-quality video service provision. In this paper, we study the problem of collaborative video distribution among ONUs under the limited storage capacity of each ONU with the aim to maximize the video hit ratio of ONUs (VHRO). Two scenarios will...
One main challenge in network virtualization is virtual network embedding (VNE). VNE is NP-hard. Previous VNE algorithms in the literature are mostly heuristic, while the remaining algorithms are exact. To make a trade-off between the heuristic and the exact, this paper proposes the algorithm VNE-RSOT, based on restrictive selection and optimization theory, to solve the VNE problem. The restrictive...
In this paper, a novel Cross-layer Dynamic Bandwidth Allocation Algorithm Based on Convex Optimization Theory(CO-CDBA) in Digital Video Broadcast-Return Channel via Satellite system is proposed. A novel utility function by taking application layer, Data Link Layer and physical layer(PHY) parameters into account is established. The Dynamic Bandwidth Allocation(DBA) problem is converted to a convex...
In order to solve the problem of instability clustering in Ad Hoc Networks with complex and changeable node motion, this paper proposes a weighted clustering algorithm based on node stability(SA-WCA). In this algorithm, we propose a node stability factor based on node received power, which does not need to calculate the specific distance between nodes and can only judge the relative motion between...
The current satellite network design is approaching an inflection point with mobile devices as the primary enduser devices. In addition, identifier/location separation is commonly used to enhance mobility in future satellite networks. To this end, a key issue must be addressed is the design of rapid mapping resolution system. In this work, a design overview of a rapid mapping resolution system is...
The flow aggregation scheme which aggregates a large number of finer-grained services into one large flow can save transceivers and improve spectrum efficiency. It ensures that all services in the aggregated flow have a same routing. Moreover, the spectrum allocated to all finer-grained services in the aggregated flow is continuous. Compared with independent transmission scheme which conducts the...
A mode conversion-based crosstalk-aware routing, spectrum and mode assignment (MC-CA RSMA) algorithm is introduced in space-division multiplexing elastic optical networks (SDM-EONs) over few-mode fibers. Simulation results show the MC-CA RSMA algorithm can greatly reduce the impact of inter-mode crosstalk on network performance compared with benchmark algorithms.
In this paper, we propose a light-tree based multicast flow aggregation (LT-MFA) scheme which can achieve the cost-efficient multicast service provisioning in elastic optical datacenter networks (EDONs). Moreover, a user-cover ratio based aggregation strategy is proposed for the LT-MFA scheme. An Integer Linear Program (ILP) model and a heuristic algorithm are developed to realize the LT-MFA scheme...
To improve the local accessibility performance, some important services are usually replicated and maintained in multiple datacenters. A user can request any datacenter which hosts the required service. The traditional end-to-end path is gradually replaced by the end-to-service path. To resist the frequently occurred natural disasters or human-made faults, survivability technologies need to be deployed...
In this paper, we develop two joint routing and resource allocation algorithms for stealth and ordinary services in optical networks. The transmission of stealth service needs to be hidden in ordinary services to achieve a better performance in privacy. Two heuristic algorithms construct paths for stealth and ordinary services base on the different routing methods. The proposed algorithms improve...
Aiming at the problem that the dynamic arrival of the virtual network requests in the wireless network environment leads to the unbalanced allocation of the substrate network resources and the low acceptance rate of the subsequent requests, a topology-aware wireless virtual network embedding algorithm (WVNEA-TA) is proposed. By analyzing the dynamic topological attributes of the virtual network and...
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