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A large university usually has many units that may locate far apart, and there are many proxy servers installed to give web access services to those units individually. However, some proxies may face the performance bottleneck when many users access the Internet simultaneously since such servers have limited capacity and could not handle high workload whereas the workload cannot be transferred to...
We develop a protocol through which multipath enabled IP routers collectively engage in dynamic traffic engineering, to optimize performance in concert with legacy TCP congestion control. We build on recent theory which shows a globally optimum resource allocation across the TCP/IP layers can be achieved through control of rates and multipath routing fractions following a consistent congestion signal...
IEEE 802.16d standard defines WiMAX Mesh mode, which uses Centralized Scheduling (CS), Distributed Scheduling (DS), and co-existence of CS/DS data subframes to allocate resources for data transmissions. The CS and CS/DS schemes are suitable for Internet traffic, but the lack of spatial reuse in over-pessimistic use of CS causes scalability problems and bandwidth limitations. In this paper a Hybrid...
Emerging Peer-to-Peer (P2P) technologies have enabled various types of content to be efficiently distributed over the Internet. Most P2P systems adopt selfish peer selection schemes in the application layer that in some sense optimize the user quality of experience. On the network side, traffic engineering (TE) is deployed by ISPs in order to achieve overall efficient network resource utilization...
The current Internet is built on a set of protocols, but exhibits problems in supporting applications. The network is optimised for best-effort traffic, but other functional aspects are widely neglected. Applying concepts well-known in software engineering (abstraction, composition, separation of concerns) to design the future Internet architecture is seen as a promising way forward. This paper presents...
HSPA (High Speed Packet Access) technologies have become an attractive solution for broadband wireless Internet access. This article evaluates the quality of service experimented by one HSPA user in the presence of multiple terminals sharing the cell capacity. The study focuses on Web traffic and includes analytical and simulation results, providing a basis for dimensioning and admission control in...
Utility function theory in microeconomics is introduced into the switching fabric performance evaluation in this paper. We propose a new switch performance evaluation model-based on delay utility function, and with utility maximization theory to find out the optimum allocation scheme of network resources. And then we extend the model, integrate the two most closely to the nature of traffic flow and...
A server farm is examined, where a number of servers are used to offer a service to impatient customers. Every completed request generates a certain amount of profit, running servers consume electricity for power and cooling, while waiting customers might leave the system before receiving service if they experience excessive delays. A dynamic allocation policy aiming at satisfying the conflicting...
The real data of the network traffic were analyzed to find out characteristic parameters for autonomic provisioning. An observed strong non-linearity (bursts) leads to heteroskedastic (time dependent conditional variance) model applications. The non-linear time series model and statistical method were applied. It was found that upper limit of burst variations could be quantitatively estimated with...
BitTorrent (BT) is an extremely successful peer-to-peer (P2P) application providing efficient file sharing over the Internet. The ever-increasing traffic among the peers has also put unprecedented pressure to Internet Service Providers (ISPs). P2P locality has therefore been widely suggested, which explores finding local resources to optimize the cross-ISP/AS traffic. However, the ISPs would fail...
Efficient metadata management is critical for distributed file system in cloud computing. In this paper we propose a new metadata management scheme which employs master metadata server (MMDS) and metadata look-up table server between the metadata servers and clients. The MMDS checks the state of MDSs for load-balancing, and thereby avoids hot spot. The proposed scheme significantly reduces the network...
With the improvement of the P2P network traffic proportion accounted for the total flow, P2P networks actually had become an important component of next generation Internet. In P2P network, the existence of Hubs lead to the reducing of the ability of anti-coordinated attack in entire system, and it makes the system become awfully fragile. In this paper, aims to the current phenomenon of the Hubs in...
The following topics are dealt with: wireless networking; network optimization; service management; visualization and P2P; cloud management; information modeling; performance and fault management; resource allocation & control; IMS/SIP; IT management; traffic flows, sampling, and classification; routing; intrusion detection and fault management; resource management; WLAN and ad hoc networks; policy-based...
Network load balancing is the ability to aggregate two or more wide area network (WAN) connections in order to achieve greater reliability and overall throughput. This paper discusses traffic technology and flow optimization in optical network. Performance optimization of networks is actually a control problem. Traffic engineering should provide sufficient control in an adaptive feedback control system...
The hybrid application layer multicast (ALM) has been shown its efficiency by leveraging the conventionally main structures of application layer multicast, tree-based and mesh-based. However, how to select the proper node to construct the overlay and how to establish the connection between any two nodes are still unsolved. Therefore, this paper is to design a novel construction algorithm for the hybrid...
A load balancing algorithm functioning as an extension to the topological routing scheme is proposed. The algorithm is designed to evenly distribute the traffic load in a 4-regular grid network. This is done by letting each node calculate how loaded it is with regular intervals and feed this information to its neighboring nodes, which then use it to derive link probabilities applied in probabilistic...
Explicit path setup and constraint-based routing make Multi Protocol Label Switching (MPLS) a suitable technology to consider QoS constraints of the user and traffic engineering (TE) objectives of the provider. This work focuses on the problem of selecting bandwidth guaranteed path for MPLS based networks. The selected path should also fulfill the provider's objective of reducing the blocking probability...
This paper presents a comprehensive load balancing approach using priority based migration (PBM) mechanism for a trusted small scale distributed computing environment. A process migration server (PMS) that acts as a cluster management server reduces latency time in migrated process execution; leading to no starvation condition for any process thus achieving uniform distribution of load among all the...
For the emerging concept of network virtualization where a multitude of virtual networks (VNs) coexist, the main challenge is to isolate and control the resources allocated for individual virtual networks. Realizing such resource allocation requires deliberate design of the router enhanced specifically for handling a large number of virtual network flows. This paper discusses fundamental challenges...
The paper describes an optimization model which aims at minimizing the maximum link utilization of IP telecommunication networks under the joint use of the traditional IGP protocols and the more sophisticated MPLS-TE technology. The survivability of the network is taken into account in the optimization process implementing the path restoration scheme. This scheme benefits of the Fast Re-Route (FRR)...
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