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System security is a crucial constraint for secure transfer of data. Because of the nature of the SSH protocol, anyone with access to the central server can manipulate files, it is imperative that only authorized users be able to access the central server. Secure transfer has taken steps that will discourage several common attempts to forcefully gain access to the system. These steps include implementing...
In this paper, we introduce an IP multimedia sub-system (IMS) based testbed which provides a platform for the study of real-time services integration and orchestration. This open-source based testbed is built on the principle of service oriented architecture (SOA), with an emphasis for real-time network services. We further developed service-oriented system functionalities such as optical network...
Defined by the 3GPP, the IP multimedia subsystem (IMS) is an architectural framework that enables the delivery of multimedia services in mobile networks. Based on the session initiation protocol, the IMS offers unified billing, QoS negotiation mechanisms, and the possibility of combining services deployed in different environments like CAMEL and Parlay OSA. With the aim of determining the real limitations...
Service creation by composing existing services and/or network resources is considered by Telecom and Internet industries as the trend for service provisioning in next generation networks. Related research work is being carried out for years, and various service composition approaches have been proposed by different standardization organizations and companies catering to different network requirements...
In this paper, we present the design and the implementation of a test-bed for the Policy and Charging Control (PCC) system proposed in 3GPP TS23.203. Specifically, we use an IP multimedia call service example to demonstrate how to implement an advanced mobile service with policy and charging control in our test-bed. We show that the PCC system can handle the application-level session information and...
In this paper, we propose an analytical expression for estimating byte loss probability at a single server queue with multi-scale traffic arrivals. We extend our investigation on the application potentiality of the estimation method and possible its quality in connection admission control mechanisms. Extensive experimental tests validate the efficiency and accuracy of the proposed loss probability...
This paper describes implementation of Web server using Altera Nios II embedded IP core, a configurable general purpose embedded RISC processor with embedded peripheral architecture. A Web server is a computer that delivers Web pages to other computers in the network. Every Web server has a unique IP address and possibly a domain name. Any computer can work as Web server by installing server software...
Voice over Internet Protocol is a growing technology that enables voice communication through the Internet. The transmission of audio data over packet switched networks faces lot of difficulties by a variety of network impairments. Such networks are not designed to support real time voice communication because of their variable characteristics. The conversational quality of a VoIP communication is...
Of the many peer-to-peer (P2P) systems in existence, BitTorrent is one of the most appealing that has managed to attract millions of users in the past few years. In this paper we present an extensive study of BitTorrent availability through measurement and analysis. Previous studies are limited to tracker without distributed hash tables (DHT), which have been used widely already. We first discuss...
Virtual network is an important approach to support multiple legacy applications running unmodified in distributed virtual computing environments. A virtual networking approach called VirNet is proposed in this paper. VirNet can build multiple customized and isolated virtual networks simultaneously on the same physical hosts in the network, and it enables existing distributed applications written...
Evaluating and possibly improving the fault tolerance and error detecting mechanisms is becoming a key issue when designing safety-critical electronic systems. The proposed approach is based on simulation-based fault injection and allows the analysis of the system behavior when faults occur. The paper describes how a microprocessor board employed in an automated light-metro control system has been...
This talk focuses on the current problems in providing high-quality robust IC designs from an IP providers point of view. It mostly discusses problems rather than solutions based on the belief that identifying the main problems is more than half the solution.
Task Graphs is a commonly used application model in research in computer-aided design tools for design space exploration of embedded systems, including system synthesis, scheduling and application mapping. These design tools need an estimate of the actual communication in the target system caused by the application modelled by the task graph. In this paper, we present a method for analytically deriving...
In this paper we approach the performance aspects of MPSoC platforms, from the point of view of IP placement with the focus on network-on-chip (NoC). Proper IP placement is important for several time-dependent applications such as video and voice where traffic must be delivered on time in order to operate properly. Proper placement of IPs can lower the traffic congestion, improve overall execution...
Wireless sensor networks have become very useful in so many applications. Applications such as grape monitoring, insect movement monitoring and etc., that allows connectivity between sensor network and Internet can solve many remote control and monitoring problems. IPv6 over low power WPAN (6lowPAN) protocols are suitable technology that can be adapted in wireless sensor network. The deployment of...
In this paper, we provide a brief survey about the recent standardization advances in the field of mobility management for DVB-H mobile TV systems. The mentioned topics include: DVB-H to DVB-H handover, and DVB-H service roaming. In addition, since the DVB-H standard itself specifies only the behavior below the IP layer, other service layer standards over the DVB-H, e.g. OMA BCAST or DVB-IPDC, are...
A SoPC design is implemented based on open source LEON3 SoC platform in this paper. The hardware design consists of IP mapping, generics configuration, address space configuration, source code modification, and so on. The software design includes operating system porting and application software porting. The designed SoPC runs at 40 MHz with a power consumption of 168 mW. Minigui software running...
Services utilizing wireless LANs as communication infrastructure are drawing much attention these days. However, access points (APs) of existing wireless LANs are in most cases connected with wires and it is fairly expensive to install APs. Wireless mesh network is one of the ways to solve this problem. In this paper, we propose a new method to improve the communication quality of wireless mesh network...
In this paper, we present novel network interface architecture for on-chip networks to increase memory parallelism and to improve the resource utilization. The proposed architecture exploits AXI transaction based protocol to be compatible with existing IP cores. Experimental results with synthetic test case demonstrate that the proposed architecture outperforms the conventional architecture in term...
To solve the problems of congestion and fault tolerance for global communication management in network on chip (NoC), a novel dynamic routing scheme base on network monitor called DyRS-NM, is proposed for NoC application. DyRS-NM has the ability to locate dynamic congested or faulty links to detour them based on the overall network status values collected by network monitor, and also can balance the...
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