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Increasing attention is paid to mobile ad hoc networks last time. Application of such networks expands a range of opportunities in activity felds of man. The main objective of mobile ad hoc networks, as well as any other, is data transmission. It is provided by TCP. This paper is devoted to the performance evaluation of TCP under influence of various MANET aspects separately and together. The paper...
Path length of a multi hop Ad Hoc networks has an adverse impact on the end-to-end throughput especially during network saturation. The success rate of forwarding packets towards destination is limited due to interference, contention, limited buffer space, and bandwidth. Real time applications streaming data fill the buffer space at a faster rate at the source and its nearby forwarding nodes since...
The performance of wireless scheduling algorithms directly depends on the availability and accuracy of channel state information (CSI) at the scheduler. As CSI updates must propagate across the network, they are delayed as they arrive at the controller. In this paper, we analyze the effect that delayed CSI has on the throughput performance of scheduling in wireless networks. By accounting for the...
Since traffic load in mobile networks typically changes significantly over time, time-varying routing, where routing changes in certain time intervals, seems an obvious solution. Yet multiple researchers have claimed independently in the past, that time-varying routing does not lead to worthwhile benefits given its overhead. In this paper, we study this issue in a systematic way. We argue that previous...
In wireless LANs, MAC protocols perform one of the most important tasks: efficiently sharing the limited bandwidth among the contending stations. In IEEE 802.11, Distributed Coordination Function (DCF) is used as a default MAC protocol. Despite its wide acceptance, it has two major downsides: i) Channel idle time and ii) Collision overheads. Besides, the use of the explicit ack frames incurs extra...
In this paper we present a fault tolerant Mesh based Network-on-Chip design that helps to tolerate router faults along with core recovery mechanism. Spare links are used to provide a connection to horizontal and vertical routers pivoting the failed one. To compliment the modified topology a routing algorithm has been developed that uses minimal and non minimal paths to communicate between source and...
Today's cloud datacenters host wide variety of applications which generate diverse mix of internal datacenter traffic. In a cloud datacenter environment 90% of the traffic flows, though they constitute only 10% of the data carried around, are short flows with sizes up to a maximum of 1MB. The rest 10% constitute long flows with sizes in the range of 1MB to 1GB. Throughput matters for long flows whereas...
Network-on-Chip (NoC) is an emerging solution for interconnect problems for both ASICs and FPGAs nowadays. In this paper, we deliver a comparative review between ASIC-based and FPGA-based NoCs. An exploration of design tradeoffs for different NoC design parameters is also given. We also propose an evaluation methodology and design recommendations for various design parameters for both ASIC and FPGA...
Storm pub-sub is a novel high performance publish subscribe system designed to efficiently match events and the subscriptions with high throughput. Moving a content based pub-sub system first to a local cluster and then to a distributed cluster framework is for high performance and scalability. We depart from the use of broker overlays, where each server must support the whole range of operations...
This paper studies alternative Network-on-Chip architectures for emerging many-core chip multiprocessors, by exploring the following design options on mesh-based networks: Multiple physical networks (P), cores concentration (C), express channels (X), it widths (W), and virtual channels (V). We exhaustively evaluate all combinations of the afore-mentioned parameters (P, C, X, W, V), using the energy-throughput...
Increasing numbers of service providers have tended to use tens of geographically dispersed datacenters in recent years. Thus, a major unmet challenge is efficiently transferring data among multiple datacenters in different domains. Traditional single-path transfer mechanism based on BGP has limited reliability and low link utilization; therefore, multi-path inter-domain flow transfer mechanisms have...
Software Defined Networking is one of the most promising approaches to the deployment of future network infrastructures. The most of the Internet service providers have to deal with a number of configurations to a crescent amount of network devices. SDN is a paradigm that proposes the separation of data forwarding plane from the data control plane. OpenFlow is an standard protocol used in SDN for...
The latter half of the twenty first century in India will witness the nascent technological advancements and the same will offer a highly complex and competitive environment. Service providers will be experimenting new options for ensuring seamless services in minimum time with the motif of spearheading competitiveness. Wireless technology revolutionized technical environment by offering many more...
Improving availability and throughput is a significant challenge for data center networks. Recent studies have attempted to use a variety of routing and multipathing techniques. However, no method has yet managed to combine availability and throughput improvement with actual deployability, usually because of dedicated hardware requirements. In this study, we focus on commodity-based layer-3 data center...
In this paper we introduced two enhancement modifications to the well-known TCP Westwood fast retransmission and fast recovery mechanisms. Firstly, a new modification is introduced to fasten the fast retransmission procedure by preventing the TCP sender side from waiting the third duplicate ACKs to retransmit lost packets. Secondly, further modification is presented to achieve better recovery for...
We tightly integrate caching and congestion control into a unified approach to enhance user-centric performance in information-centric networking. To do that, we take advantage of the available congestion price fed back by congestion control to guide caching decision at each content router. The point is to let caching work in a longer time scale to alleviate congestion retrieving expensive content...
With the 20th anniversary of IPv6 nearing quickly, a growing number of Internet service providers (ISPs) now offer their customers both IPv6 and IPv4 connectivity. This makes multi-homing with IPv4 and IPv6 increasingly common even with just a single ISP connection. Furthermore, the growing popularity of multi-path transport, especially Multi-Path TCP (MPTCP) that is the extension of the well-known...
Software-defined networking (SDN) renovates traditional networking systems by replacing a distributed, per-switch control plane with a (logically) centralized one. To design a scalable, highly available SDN control plane, it is inevitable to disseminate the network state to multiple instances horizontally by using measures like replication and partitioning. However, some recent studies reported that...
Multiple-Input Multiple-Output (MIMO) communications have shown great promise in providing high spectral efficiency for wireless mesh networks. We have proposed CrossLayerMethod [1] to solve the resource allocation problem including joint routing, scheduling, and power control for MIMO-based mesh networks. However, the computation complexity is prohibitively expensive for networks with more than ten...
This manuscript investigates the issue of implementing chains of network functions in a “softwarized” environment where edge network middle-boxes are replaced by software appliances running in virtual machines within a data center. The primary goal is to show that this approach allows space and time diversity in service chaining, with a higher degree of dynamism and flexibility with respect to conventional...
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