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Wireless sensor network is a distributed system for sensing and monitoring the incorporated environment. Generally congestion in WSN network occurs due to transmission of packet in the inappropriate path from source to destination. Congestion in network creates additional load to the network. In Wireless Sensor Network (WSN) Congestion is one of the deemed challenge which reduces the resource and...
Dynamic Adaptive streaming over HTTP (DASH) is widely used by content providers for video delivery and dominates traffic on cellular networks. The inherent variability in both video bitrate and network bandwidth negatively impacts the user Quality of Experience (QoE), motivating the design of better DASH-compliant adaptation algorithms. In this paper we present ARBITER, a novel streaming adaptation...
The higher demand for data traffic and the emergence of new applications has made mobile networks challenging to maintain high data rates for users, in particular those located on the cell's edges. The Coordinated Multipoint (CoMP) technology adopted in long-term evolution (LTE) cellular networks allows improving the cell's edge performance. In order to improve throughput performance gain in the downlink,...
This paper analyzes the effect of a dynamic programming algorithm that controls the departure pushback rate at congested airports, with an emphasis on the uncertainty of the underlying processes. The state of the airport at any time includes the number of departures taxiing to the runway, and the number of departures queued at the runway. The state of the airport surface at the start of a time-window...
This paper presents the performance of scheduling for adaptive modulation and coding based on the dynamic margin control. To cover various wireless channel conditions and requirements for multimedia traffic QoS, the selection of suitable MCS (Modulation and Coding Scheme) is important technique in real deployment and management fields. In this paper, we propose dynamic margin control schemes based...
In current Enterprise WLANs (EWLANs), mobility management remains a challenging issue due to the rapid growth of mobile user number and varying traffic load. With conventional mobility managers, client handoff are based on signal strength of APs which often leads to imbalanced traffic load among APs. Software Defined Networking (SDN) has gained increasing popularity as a novel network architecture...
One of the major challenges in Dynamic Spectrum Access (DSA) systems is to guarantee a required level of Quality of Service (QoS) to secondary users of the spectrum. In this paper, we propose efficient algorithms for deriving optimal policies for the sensing / transmitting trade-off in hardware-constrained DSA systems. Unlike previous approaches which seek to maximize mean data rate for the secondary...
Binary Exponential Backoff (BEB) algorithm is utilized to resolve the channel contention for IEEE 802.11 wireless networks. However, BEB algorithm does not meet the user expectation due to the large collision probability and the poor network fairness when the number of stations is large. To overcome the problems, a novel synchronized contention windows-based backoff algorithm is proposed, i.e., SCW...
In this paper, we study completely uncoupled learning algorithms for general utility maximization. We illustrate the algorithm with a wireless network application viz distributed user association. Our main contribution is expansion of achievable rate region by allowing time sharing of resources, which the previous works based on completely uncoupled strategies have ignored. First, we present a distributed...
The Tor network has its user grown by thousands every year. The increasing number of users around the world makes Tor become one of the widely used privacy networks today. However, as the number of Tor user increases, the performance of Tor degrades badly due to traffic is not fairly distributed. As a result, the Tor network does not provide a better quality of communication for all its users. To...
This paper considers a problem of user and access point associations in heterogeneous wireless networks consisting of multiple radio access technologies. We propose a strategy for optimizing the problem that aims at maximizing the total minimal utility of users in the longer term. The minimal utilities can be obtained from bare essentials of the quality of experience and defined by considering different...
Software Defined Network (SDN) provides a new fine-grained interface enables the routing algorithm to have an a global view of the network throughputs, connectivity and flows at the data-path. This paper aims to provide a novel approach for dynamic routing algorithm for Software Defined Network in Wide Area Network (SDN-WAN); based on using a modified shortest-widest path algorithm with a fine-grained...
In recent days, more complicated interconnection topologies have been replaced with previously simple topologies that also exhibit high performance. x-Folded TM network is a TM network that is folded according to the imaginary x-axis in interconnection networks. For a x-Folded TM network, there is a reduction in the average distance and diameter which corroborates the efficient performance. Also many...
This paper is on the improvement of Quality of Service (QoS) of IEEE802.11e by intelligently setting the MAC layer parameters. During the EDCA period, the backoff time is the main component of IEEE802.11e standard to access the channel which includes various parameters such as CW and AIFS. Assigning constant priority to access the channel regardless of the queue length of traffic type raises many...
In this paper, we propose an efficient identification algorithm for RFID systems based on EPC C1 Gen2 RFID standard1. Specifically, the proposed anti-collision algorithm is based on the observation of sub-frame during an identification process, and makes effective use of idle and collision statistics to accurately estimate the tag backlog and determine the proper frame size for the next inventory...
Nowadays, cognitive small cell networks (CSCNs) have been widely accepted as a promising and efficient method to deal with exponentially increasing demand of wireless data services. As small cells become smaller and denser, inter-cell interference (ICI) at user equipments (UEs), coming from adjacent base stations (BSs), expanded dramatically and has grown more complicated to be managed. In order to...
Nowadays, many, parallel computers which many PEs are connected by interconnection network have been developed. Many interconnection networks of parallel computers for there have been proposed. Among them, 2D-Torus Network is a well-known interconnection network. In the interconnection network, there are two types of deterministic routing and adaptive routing. Adaptive routing has many advantages...
The mechanisms of allocating the resources in Long Term Evolution (LTE) cellular networks are very critical issues, because scheduling algorithms have the main responsibility for determining how to allocate radio resources for different users. In this work a dynamically adopted Proportional Fair (PF) scheduling strategy for capacity enhancement of LTE system is proposed. Performance comparison with...
Online compression of I/O-data streams in general purpose computing will enhance the effective I/O bandwidth of processors, the bandwidth of the computer network as well as the storage capacity and the read/write performance of the storage. In this paper, a self-adaptive dynamic partial reconfigurable architecture for the online compression of data streams is introduced. The proposed architecture...
Estimation-based backoff algorithms for channel access are being widely studied to solve the wireless channel accessing problem especially in super dense wireless networks. In such algorithms, the accuracy of the channel state estimation seriously determines the performance. How to make the accurate estimation in an efficient way to meet the system requirements is essential in designing new channel...
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