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LTE Hetnet deployments using pico cells raise many questions regarding their deployment and operation. This study addresses some key questions using a system simulator and three different traffic models, FTP, HTTP and real-time video. Uplink and downlink are considered. Conclusions drawn from previous work are verified using these models. It is found that system throughput or user satisfaction is...
Hardware implementation is the research focus on improving the processing speed of Hash algorithm. In this paper, through the analysis of the SHA-1 algorithm, the node model of round iteration is designed based on Field programmable gate array (FPGA) and optimized by means of pipelining. Experimental results show that SHA1 algorithm model with three-input adder node achieved good performance, and...
IEEE-802.11-based WLAN MAC performance evaluation is of great importance, especially under non-saturated conditions. A new load equation, respect to the non-saturation, is proposed for analysis of the MAC mechanism in this paper. The load equation together with a backoff equation and a transmission equation are sufficient to analyze the MAC performance under non-saturated conditions. In the new load...
The provision for addressing multiple destinations in group multimedia application delivery over Wireless Mesh Networks (WMN) can be achieved efficiently via multicasting while considering the mobility of Mesh Clients (MC). One of the prominent components of WMN is the Internet Gateway (IGW) which provides wired bridge connection between the backbone network and the Internet. In addition, its cost...
Mobile Ad Hoc Network (MANET) is a mutually communication based on a dispersed administration. It has a dynamic topology and there is not any central point for network management. The dynamic topology character of MANET has caused it vulnerable and defenseless to different security attacks. In this paper we study the effects of Wormhole attack on MANET using both Proactive routing protocol (OLSR)...
Performance analysis of network queuing model is very important due to delay and latency that may be caused by using inappropriate model. It also impacts the utilization and throughput of the network. Many network queuing models have been proposed to be used in the network such as Poisson distribution model and Exponential distribution model. The first step in using a suitable queuing model is to...
We consider a P2P-assisted content storage and delivery system to support a streaming Video-on-Demand (VoD) service. In this system, the peers are part of the service provider (e.g. set-top boxes) with limited storage space. Servers with ample storage and bandwidth are deployed to guarantee the availability and quality, but it is desirable to minimize the server utilization to reduce costs. Based...
Enterprise clouds today support an on demand resource allocation model and can provide resources requested by applications in a near online manner using virtual machine resizing or cloning. However, in order to take advantage of an on demand resource model, enterprise applications need to be automatically scaled in a way that makes the most efficient use of resources. In this work, we present the...
Multi-stage buffered Clos-network switches suffer from out-of-sequence packet forwarding. This paper proposes a three-stage memory memory memory (MMM) Clos-network switch, called the MCS switch, which provides in-sequence packet forwarding while maintaining high throughput. The proposed MCS switch adopts the oldest-cell-first selection for arbitrations at the first and second stages and an iterative...
In the scope of mobile systems and specifically the beyond 3G systems, handover presents a challenge due to the role it plays in achieving seamless mobility. In LTE, the current standardized mechanism is the received signal received power (RSRP) which is performed on the downlink path. Yet, due to the imbalances which are embedded between the uplink and the downlink path it necessary to take the uplink...
Cloud storage systems take advantage of distributed storage technology and virtualization technology, to provide virtual machine clients with customizable storage service. They can be divided into two types: distributed file system and block level storage system. Orthrus is a Light weighted Block-Level Cloud Storage System, which adopt multiple volume servers' architecture to avoid single-point problem...
802.11e enhanced distributed channel access (EDCA) introduces different parameters to provide differentiated QoS support for various traffic classes. This brings additional difficulties and complexities to the traditional per-slot based Markov chain modeling techniques, where the transmission probability relies on generic time slots. Channel access cycle based modeling, which does not depend on per-slot...
The traffic demand in future mobile cellular networks is expected to increase exponentially which would lead to dense base station deployment and eventually higher energy consumption. The current dominant mobile systems including GSM and UMTS were not designed with focus on energy efficiency. This paper investigates the energy saving potential of pico nodes in a heterogeneous network from an incumbent...
LTE-Advanced is the evolutionary path from LTE Release 8. It is designed to significantly enhance the performance of LTE Release 8 in terms of higher peak data rates, improved system capacity and coverage, and lower latency. These enhancements allow LTE-Advanced to meet or exceed the IMT-Advanced requirements and are being considered as part of LTE Release 10. In this paper, some of the physical layer...
Cooperated multi-point technique in HSPA+ system has not been paid attention until the Single Frequency Dual Cell (SF-DC) mode, where one user equipment (UE) may be served by dual NodeBs simultaneously in the single carrier frequency network, is proposed recently. In the previous research, the system-level performance with SF-DC operation had not been studied comprehensively. The main contribution...
We present a large-scale cell based measurement analysis of the user behavior in a live operational HSDPA network. The motivations are: first, to understand the statistical properties of users in cells for refining network planning procedures; and second, to provide realistic traffic models for simulations of cellular packet-oriented networks. We provide an analysis of mean cell load over daytime,...
This In this paper we evaluate the impact of refresh intervals of OLSR protocol and adjusting initial RTO in TCP New Reno algorithm on the performance of MANETs containing 10 and 50 mobile nodes. HTTP low load traffic is used over the designed networks. Performances of the networks are measured in terms of network throughput, network delay, TCP delay, as well as HTTP object response time. Simulation...
Multipath TCP (MPTCP) has just been approved by the IETF. It was designed to be fairly shared with regular TCP, so its performance is equivalent that of a regular TCP flow that on the best path for it. However, regular TCP has been proven its performance very poor in wireless networks, where packet loss often is caused by random error rather than by network congestion as in wired networks. TCP Westwood...
A feedback reduction scheme is proposed in multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. The proposed scheme can reduce the feedback load of channel quality indicator (CQI) required for proportional fair scheduling at base station (BS). The probability distributions of instantaneous rate and average rate are studied. Then the distribution of proportional...
Contemporary embedded systems, which process streaming data such as signal, audio, or video data, are an increasingly important part of our lives. Shared resources (e.g. memories) help to reduce the chip area and power consumption of these systems, saving costs in high volume consumer products. Resource sharing, however, introduces new timing interdependencies between system components, which must...
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