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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...
We present a heuristic algorithm to address the optimization problem of routing and spectrum allocation, aimed at traffic protection and restoration in an elastic optical network. The algorithm searches for working and backup disjoint paths, using the shared path protection scheme. It divides the spectrum into two partitions and prioritizes slots in one of them for backup path traffic. The way 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.
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...
Middleboxes (MBs), such as firewalls and load balancers, are playing an increasingly important role in cloud data centers for security or performance purposes. The recent introduction of Software Defined Network (SDN) and Network Function Virtualization (NFV) in cloud data centers has greatly facilitated the efficient management of software-based middbleboxes in data center networks. In policy-driven...
In this paper, we propose an OpenFlow-assisted framework for P2P (peer-to-peer) live streaming, which incorporates an OpenFlow-assisted architecture and an OpenFlow-assisted algorithm. The architecture combines the characteristics and advantages of both BitTorrent system and OpenFlow network. The algorithm can dynamically calculate the path and corresponding available bandwidth for each flow according...
Future 5G network provides network slices for applications of different areas on the same physical network. Low-latency is the most key indicators of demand for the slices. How to establish the low-latency network slices is an essential question. This article proposes a mapping algorithm for low-latency network slices based on linear programming. Firstly, this problem can be defined as a linear programming...
A light trail is a unidirectional bus from a convener node to an end node. The main advantage of a light trail over a light path is that the communication channel of a light trail can be accessed by intermediate nodes providing more flexibility for traffic grooming. Several auxiliary graph models have been developed in the literature for traffic grooming in light-trail optical WDM mesh networks. These...
A current-source active power filter (CS-APF) always has an LC filter at its output to remove switching ripple in its compensating current. However, the cutoff frequency of this LC filter also limits the control bandwidth as well as increases the order of the CS-APF current control loop. This issue combining with the inevitable time delay in the DSP-based controller applied to the CS-APF make the...
Large amount of data is being generated at an alarming rate by various systems and devices such as computing systems, cameras and mobile devices. Owing to the huge volume of this data, its processing and analysis cannot be just limited to the place of origin but require to be done at multiple computing sites. A crucial problem is how to efficiently transfer and handle big data in a network, whose...
Nowadays, video streaming causes traffic over the Internet. Dynamic Adaptive video Streaming (DAS) has emerged as a promising solution. However, existing researches in DAS focus on single client instead of multi-client which is much closer to reality. Even if some methods are proposed for multi-client scenarios, they need to add coordinate proxy to the network or add additional function to routers...
In the IEEE 100G-EPON, channel bonding enables ONUs to work on multiple wavelengths simultaneously to achieve higher peak rates. Three types of ONUs (25G, 50G and100G ONUs) share all the 100G bandwidth and each type of ONUs have a total capacity constraint. In this paper, a fair and flexible dynamic wavelength and bandwidth allocation algorithm is proposed for 100G-EPON. Proposed algorithm considers...
Modern stream processing frameworks, such as Spark Streaming, are designed to support a wide variety of stream processing applications, such as real-time data analytics in social networks. As the volume of data to be processed increases rapidly, there is a pressing need for processing them across multiple geo-distributed datacenters. However, these frameworks are not designed to take limited and varying...
Named Data Networking (NDN) is a general proposed network layer protocol which offers a set of rich functionality: in-network storage, multi-path forwarding, and data-centric security. The cache and multi-path feature improves the efficiency of transmission but increases the difficulty of the bandwidth estimation. In this paper, a dynamic layer switching strategy using Lyapunov Optimization is proposed...
We have introduced a novel metro network architecture called Ultra-Dense Wavelength Switched Network (UD-WSN) [1], which enables an even fine spectrum granularity so as to efficiently accommodate low-speed metro services (e.g., 1GE/10GE services). We evaluate the performance of this type of networks with spectrum defragmentation and partial optical transport network (OTN) switching. An efficient spectrum...
In recent years, Dynamic Adaptive Streaming over HTTP (DASH) has gained momentum as an effective solution for delivering videos on the Internet. This trend is further driven by the deployment of existing HTTP cache infrastructures in DASH systems to reduce the traffic load as well as to serve clients better. However, deploying conventional cache servers in DASH systems still suffers from low cache...
Dynamic Bandwidth Allocation (DBA) is a fundamental task in Ethernet Passive Optical Networks (EPONs). An EPON must use an efficient DBA to achieve good network performance. A variety of DBA algorithms have been proposed towards this end. Most of these algorithms use average packet delay as an important metric for measuring the performance of the algorithm. In this paper, algorithms for Time Division...
Network virtualization is a dynamic context leading to imbalance for substrate network (SN) resources which can affect the virtual network (VN) request further. In this paper, we propose the GRC-mopso-VNE algorithm to solve the VNE problem taking link resources into consideration in the stage of node mapping. A novel metric is developed, i.e., global resource capacity (GRC), to evaluate the mapping...
We investigate the problem of data-intensive vNF service chain (vNF-SC) orchestration in inter-datacenter EONs. After analyzing the NP-hardness of this problem, we solve it in a sequential manner by optimizing both the request serving sequence and the data-intensive vNF-SC orchestration. Specifically, we propose a request sorting algorithm and a data-intensive vNF-SC orchestration algorithm based...
Erasure coding has been widely adopted by data center networks, where the data is encoded and stored in multiple locations. Therefore, an efficient data retrieval service is needed to transfer encoded data from replicated stored nodes to a single destination. Elastic Optical Networks are a promising backbone technology for data center communication due to their capability to efficiently and flexibly...
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