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Software-defined networking (SDN) has separated control and forwarding planes, which is a powerful approach to enable network virtualization by SDN hypervisors to share physical SDN networks among multiple virtual SDN in cloud data center. However, the centralized control and virtual network shared physical network are delicately weak and easy to failure if virtual topology embedding is not properly...
In modern data centers, many flow-based and task-based schemes have been proposed to speed up the data transmission in order to provide fast, reliable services for millions of users. However, existing flow-based schemes treat all flows in isolation, contributing less to or even hurting user experience due to the stalled flows. Other prevalent task-based approaches, such as centralized and decentralized...
To speed up the recovery from network failures, an extensive list of methods have been proposed. Many failure-recovery methods are proposed based on tunneling or marking, which increase the packet processing burden on routers and consume extra bandwidth. With neither tunneling nor marking, existing methods guarantee recovery from any single-link failure if a detour for the failed link exists, but...
Interconnection network is a main concern in the architecture design of highly parallel systems such as high density data centers and supercomputers that reach millions of endpoints, e.g., 10M cores for Sunway TaihuLight system. As the number of endpoints of such systems has gradually increased to meet the higher computing and storage demand, the interconnection network is required to provide a low...
Software Defined Networking and Network Function Virtualisation provide significantly more flexibility and control when provisioning QoS for delay sensitive services. Network delay can have a detrimental impact on VoIP quality and, therefore, minimising delay can help maintain the quality and prevent call dropping. This paper proposes a queuing scheme based on packet delay for prioritising VoIP calls...
Active Queue Management (AQM) mechanisms have come a long way, with an initial goal to avoid congestion to the recent most focus on reducing queue delay. The benefits of using AQM mechanisms at routers are being thoroughly studied nowadays, mainly to avoid the problem of bufferblaat. Although a lot of work has focused on analyzing the behavior of AQM mechanisms, the nature of traffic used while deriving...
Nowadays data centers are attracting a huge attention of researchers. The performance of the data centers is key to hold the successes of cloud computing. As dimensions of cloud computing are enhanced by offering multiple services, the responsibility of service provider escalates many folds. Even hosting single service per data center requires promising conduct round the clock. Incompetency in fulfilling...
This paper proposes and evaluates a performance efficient application mapping algorithm for mesh-based NoCs. The proposed algorithm first prioritizes tasks of the given application graph based on their total in/out communication traffic. Then a task with the most communication traffic is selected and mapped onto the center part of the mesh topology i.e., a core with the most available communication...
We propose a vertex-centric distributed resource orchestration algorithm for finding all feasible mappings of a service function chain in multi-domain networks. Simulation results show superior efficiency and scalability for computing large service function chain requests.
The Avionics Full Duplex switched Ethernet (AFDX) is widely used in the new generation of civil aircraft, such as A380 and Boeing787. Some research works have been conducted to optimize virtual links (VLs) design. However, a method that optimizes the VLs design scheme from the perspective of network performability is still missing. Furthermore, the configuration parameters interact with each other,...
Common Public Radio Interface (CPRI) is a popular standard to interface the Radio Equipment Control (REC) and the Radio Equipment (RE) in the fronthaul of 5G systems. However, CPRI is expensive to deploy, consumes high bandwidth and, currently, is statically configured. Reconfigurability is highly desirable in 5G systems, and can be classified into two categories: network and bandwidth reconfigurability...
In this paper we analyzed suitability of different routing algorithms for establishing bandwidth-delay constrained traffic tunnels in SDN backbone networks. Bandwidth rejection ratio was used as indicator of algorithm's ability to efficiently utilize network resources. Through set of simulations on two real backbone topologies we showed that network topology can affect algorithm's performance, and...
This paper presents the application of QoS about a heterogeneous network based on DWDM transmission technique as core and having as edges two technology platforms, ATM and Ethernet applied QoS in residential services such as VoIP, video conferencing, digital television and data link high rates of transmission. With this design and implementation performance were performed measurements to services...
In this paper, we consider a disruption tolerant network (DTN) which enables data transmission with intermittent connectivity and in which instantaneous end-to-end path between a source and destination may not exist. We explore routing problems in such networks in consideration of limited storage for each intermediate node. A graph model called the storage enhanced time-varying graph (STVG) is presented,...
Wireless sensor networks collecting data to monitor real life processes gain increasing attention from the scientific community. These systems promise ubiquitous computing in a digitalized world. However many problems need to be solved to achieve this dream. One of these problems is the limited battery power of the nodes and the limited bandwidth of the communication. Existing work tackle the problem...
Software Defined Networking (SDN) has been a prevalent networking paradigm in recent years. Due to its simplicity to quickly deploy and fully manage networks, both academia and industry are interested in this technology. Nevertheless, there are still many issues to be solved. In this pape r, we propose to divide flow table into two separate tables, namely path table and traffic table, to minimize...
This paper targets the computation and analysis of time dispersion characteristics and power delay profile of visible light communication (VLC) channel for an indoor diffused environment. A generalized conventional ray tracing model has been adapted through parametrization of the wavelength dependence of white LED characteristics as well as the spectral reflectance of selected indoor reflectors. The...
This paper proposes a novel routing method called Accumulative-Load Aware Routing (ALAR) for Software-Defined Networks (SDN), that takes into account the cumulative load of flows on each link. By employing knowledge of the whole network topology and traffic in route computation, this approach enhances the utilization of network resources, minimize the probability of congestion and through which the...
Cloud computing has been widely used to provide services such as search, social networks, and distributed storage systems. Data centers are built to support the requests of cloud applications which generally adopt multi-layer partition/aggregation workflow pattern. In this multi-hop environment with dual-homed topology, the aggregator needs to wait for all responses from the works to generate final...
Proposed in paper is a clustered LR-PON with hierarchical architecture and multi-dimension DBA, applying MPCP and PPPoE to tree topology and star topology. The DBA scheme is based on dimensions of wavelength, frequency and time.
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