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In multi-channel cognitive radio ad hoc networks (CRAHNs), packet fragmentation is impacted by new factors besides those in traditional wireless networks due to the unique CR functions. For example, spectrum handoff is the technique for a secondary user (SU) to continue its transmission when a primary user (PU) reoccupies its current transmitting channel. Then, a short frame is less likely to be affected...
Today's indoor wireless networks employ reactive resource allocation methods to provide fair and efficient usage of the communication system. However, their reactive nature limits the quality of service (QoS) that can be offered to the user locations within the environment. In large crowded areas (airports, conferences), networks can get congested and users may suffer from poor QoS. To mitigate this,...
Modern datacenters involve a rich mix of workloads, each of which puts forward different service-level objective, including high throughput, low latency, etc. Currently, most datacenters introduce statistical multiplexing technology and oversubscription to the network design for lowering the total cost, which can easily lead to the occurrence of network congestion (loss), especially when the network...
This paper presents a comparison of throughputand end-to-end latency of synchronous and asynchronous heterogeneousNoC under uniform and exponential traffic conditionsusing different parameters. The parameters we have chosen areno. of cores, load (traffic) and no. of VCs of a router. Further, sinkbandwidth analysis of synchronous and asynchronous NoC underuniform traffic was studied and compared. The...
This paper presents two approaches targeting the reduction of power dissipation, the delay time and silicon area of S7 and S9 blocks of MISTY1 encryption algorithm. The essential part of both approaches is to reduce the number of logic gates (XOR and AND gates) used in S7 and S9 blocks ciphers. The first approach reduces the number of logic gates by applying Boolean Algebra rules and simplifications,...
In the traditional Publish/Subscribe (Pub/Sub) paradigm, most of the responsibilities lie with the broker, thus making it burdened. It also takes a considerable amount of time to first route the publications and subscriptions towards the broker, and then to further route the notifications to the subscribers. This leads to delays in data delivery. Besides delay and bandwidth consumption, the number...
Load balanced Birkhoff-von Neumann (BvN) switches are very popular due to low hardware complexity and high performance. But, for some traffic scenarios, the achieved throughput can be severely decreased. We propose a novel load balanced BvN based switch that is non-blocking (achieves 100% throughput) for any admissible traffic scenario. The proposed switch implements only one switch stage because...
Energy harvesting relaying is a promising solution to the extra energy requirement at the relay. In this paper, the outage probability of two-way amplify-and-forward relaying system using energy harvesting techniques is proposed. The analysis takes into account both the Nakagami-m fading caused by signal propagation and the interference at relay caused by other transmitters. The relay harvests energy...
Interactive and delay-sensitive applications constitute an important and growing part of the Internet. Today, low delays can only be achieved if there are no congested links along the path. At a bottleneck, the commonly used congestion control mechanisms induce high queuing delay and packet loss. Specialized congestion control mechanisms achieving a low queuing delay in an otherwise congested network...
Quality of Service (QoS) control is an important concept in computer networking, as it is related to end-user experience. While providing QoS guarantees over the Internet has long been deemed too complicated, the emergence of Software Defined Networking (SDN), and OpenFlow as its most popular standard, may facilitate QoS control. In this paper, we consider how to enable bandwidth guarantees with OpenFlow...
The emergence of Software Defined Network(SDN) gives the demand of big data and network management a chance. SDN separates the control and forwarding in traditional network through OpenFlow protocol. In the software-defined network, SDN controller is an important integral part that is the core of SDN. In this paper, firstly we summarize the common SDN controller, and choose two popular, wider using...
The development of network services makes their requirements for bandwidth become higher and more various, which leads to difficulty in Quality of Service (QoS) guarantee. In this paper, an OpenFlow switch featuring Weighted Fair Queuing (WFQ) algorithm is proposed. The system is implemented into NetFPGA 1G board which utilizes Xilinx Virtex II Pro 50 technology. The results have shown that our circuit...
WAVE is a main architecture for vehicular communication. A part of WAVE, 1609.4, describes multi-channel operations to support service data delivery. But it has fixed channel access interval that is not enough time to handle all generated packets in a congested vehicular density. The objective of this paper is to present a variable CCH interval for WAVE multi-channel access based on regional message...
Network-on-Chip (NoC) has been proposed as the communication paradigm for the Ultra Large-Scale Integration System-on-Chips. One of the key factors that determine the performance and the implementation cost of a NoC is the switching scheme. In this paper, we propose and implement a hybrid switching router based on the combination of wormhole and virtual cut-through switching schemes. The router is...
Latest research in smart grid communications has advocated the aggregation of multiple traffic flows in order to achieve an improved throughput. While aggregation improves the overall throughput, the individual flows still suffer from unfair throughput performance. As a result, the enablers for time sensitive smart grid services such as load-shedding that require a timely report of data are the most...
For cognitive radio, dynamic spectrum access is a promising development direction. Dynamic spectrum access mechanism which is considered in this paper is a kind of channel reservation mechanism. Unlike most of the existing channel reservation mechanism, it is considered that the channel is reserved exclusively for unauthorized users in this paper. This reserved channel can only allow unauthorized...
We present a simulation-based study of the impacts of channel switching overhead on the performance of multicast in multi-channel multi-radio wireless mesh networks (MCMR WMNs). We study how channel switching overhead affects the performance metrics such as packet delivery ratio, throughput, end-to-end delay, and delay jitter of a multicast session.
Multicast communications in data center has gotten great attention with its requirement for social networking services and file distribution, such as OS update towards virtual machines. Multicast communications offer advantage of efficient network resource usage. To the best of authors' knowledge, only feasibility and scalability issues have been treated in published papers for multicast communications...
SDN (Software Defined Network) is the important part of Future Network, and the OpenFlow soft switch which separates the control plane from the data plane is the key instrument. In this paper, the OpenFlow switch are analyzed, the main performance parameters are throughput, packet loss and time-delay, the influence factors are load, packet size and the transforming packet quantity. Kernel Partial...
This paper proposes a novel forward-backward four-way merger min-max algorithm and low latency check node unit (CNU) architecture for check node processing of nonbinary low-density parity check (NB-LDPC) codes. This algorithm derives simultaneously two output vectors for forward and backward processing in each step. A parallel switch network and parallel-serial elementary computation unit are proposed...
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