Public IP Networks Research Articles

Design of a Web-Based Personnel Administration Management Information System at Politeknik Piksi Ganesha

The background of this research is that the management of personnel administration at the Piksi Ganesha Polytechnic campus still uses conventional methods, is considered not optimal, and is very prone to viruses and data loss. In this study, the authors used a qualitative research method with a descriptive approach. In contrast, the software development method used was the Prototyping Method using the Unified Modeling Language (UML) system modeling, which was applied using the PHP programming language with the Laravel framework and MYSQL database. This study resulted in a web-based Personnel Administration Management Information System or Personnel Information System (SIMPEG), which has features starting from automatic employee data management, centralized employee filing, and integrated attendance with validation of devices in the campus's Public IP network. It can be accessed on mobile by employees.

Novel Modification of the Collective Dynamic Routing Method for Sensors' Communication in Wi-Fi Public Networks.

The widespread use of the Internet of Things makes it relevant to use public IP networks for simultaneous access by both users and wireless sensors. To achieve this, a significant reduction in the subscriber devices' energy consumption is required. This paper analyzes the application features of the collective dynamic routing method both with and without the use of a robust method for estimating the channel data rate for sensors' communication in wireless public networks. Based on the analysis, a novel modification of the collective dynamic routing method has been developed that reduces the sensors' energy consumption while keeping a high data rate and short delivery time for users. An analysis of the network load, the total data transfer rate over the network, and the parameters affecting the sensors' energy consumption was carried out for a segment of a seamless IEEE 802.11ax network. The simulation demonstrated a high efficiency of using a novel modification of the collective dynamic routing method for access to users and wireless sensors.

Comparative Study and Analysis of various VoIP coding Algorithms

over internet protocol (VoIP) is a method of providing phone services over dedicated public IP networks. It allows significant cost savings over traditional Public Switched Telephone Networks (PSTN). Speech quality, as perceived by the users of VoIP telephony, is critically important. Signal quality of the VoIP system is degraded by various network layer problems, which include delay, packet loss and jitter. The implementation of signal through various coding algorithms and digital signal processor can improve the quality of degraded VoIP signal. The present work deals with comparative study and analysis of VoIP Codecs (G.711, G.729, AMR, AMR-WB etc.). The VoIP simulations are conducted for G.711, G.729 and AMR-WB speech coders for different network conditions. The coding algorithms are implemented on VoIP speech signal. The results are validated through the measurement of enhancement signal using perceptual evaluation of speech quality (PESQ)/MOS measurement.

VoIP Technology: Investigation of QoS and Security Issues

Voice over IP (VoIP) is the technology allowing voice traffic transmission as data packets over a private or a public IP network. VoIP allows significant benefits for customers and communication services providers. The main are cost savings, rich media service, phone and service portability and mobility, and the integration with other applications. Nevertheless, the deployment of the VoIP technology encounters many challenges such as architecture complexity, interoperability problems, QoS concerns, and security issues. Due to the inability of the IP networking technology to support the stringent QoS constraints of voice traffic, and the incapability of traditional security mechanisms to adequately protect VoIP systems from recent intelligent attacks, QoS and security issues are considered as the most serious challenges for successful deployment of the VoIP technology. The aim of this paper is to carry out a deep analysis of the security issues and QoS concerns of the VoIP technology. Firstly, we present a brief overview about the VoIP technology. Then, we discuss the QoS problems encountering the deployment of the VoIP technology. The presented discussion mainly address the QoS issues related to the use of the IP networking technology, the QoS concerns related to voice clarity, and the QoS mechanisms proposed to support voice traffic QoS constraints. After that, we investigate the security issues of the VoIP technology. The presented investigation mainly address the vulnerabilities and security attacks of VoIP systems, as well as the countermeasures that should be considered to help the deployment of secured VoIP systems.

A Protocol Review for IPTV and WebTV Multimedia Delivery Systems

This paper reviews the key protocols used for multimedia delivery both over privately owned managed IP Networks such as IPTV and public non-managed IP Networks such as WebTV. Within these two worlds, the choice between protocols is based on the characteristics of the multimedia service required, the media server and the client's receiver.Users have different expectations of these two delivery platforms and also of different output devices such as TV, PC, tablet or mobile phone. In an IPTV environment, which is a paid-service, users demand the Quality of Service (QoS) they pay for; different quotas provide different services to users. On the other hand, with WebTV, which is a free service, clients have lower quality expectations.There are multiple multimedia delivery systems used across both platforms, using different protocols to deliver multimedia from server to one or multiple clients. These include Real-Time Protocol (RTP), Real-Time Control Protocol (RTCP), Real-Time Streaming Protocol (RTSP), Real-Time Messaging Protocol (RTMP), Hypertext Transfer Protocol (HTTP), HTTP Live Streaming (HLS) and Microsoft Smooth Streaming Protocol (MS- SSTR).RTP, RTCP and RTSP are the main protocols used in IPTV while RTMP, HTTP, HLS and MS-SSTR are protocols used mainly for WebTV. This paper will explore the main differences and similarities between them and the reasons behind the choice of one or the other. This review paper also briefly outlines a testbed being developed by the authors to synchronise media streams using a subset of these protocols.

Remote monitoring for high-speed CNC processes over public IP networks using CyberOPC

Process analytical technology encourages the industry to adopt innovative technologies to increase quality. The key components of this approach are better understanding the product manufacturing process, data analysis, process analytical tools, process monitoring, and continuous feedback during the manufacturing process. Remote process analytical technology over public IP networks can significantly reduce the cost of maintenances and technical support, and simplify the classical OPC-like architecture based on multiple server gateways. The requirements for using remote process analytical technology for high-speed processes are mainly concerned with cyber security and high data refresh rate on the remote monitoring machine. This work intends to evaluate a new, open application protocol named CyberOPC dedicated to CNC machines. The CyberOPC version presented in this paper supersedes the first version presented in previous papers, which had no streaming features. The CyberOPC technology is not only an open alternative to other data exchange protocols, but it also introduces streaming capabilities to gain high refresh rate on remote control stations. It is based on the Client/Server Model, where a software layer is introduced between CNC and the remote monitoring station, on the Server side of CyberOPC. Even if the case study adopts a tunneling Schema that includes server gateways, the requirements to develop protocols in embedded devices and modern CNC are fulfilled by several devices that include a TCP/IP stack.

Public IP network infrastructure evolutions to support emerging digital video services

Of all the services offered over a worldwide public network, digital video-based services, even at this early stage of development, are growing at such an astonishing rate that they will soon constitute the largest portion of Internet traffic. We are witnessing this today with the Internet television (TV) phenomenon, with YouTube, Netflix's online offering, and BBC's iPlayer serving as prominent examples. To optimize video-dominated networks with respect to the required transport capacity (and also to reduce the response time the end user experiences), these services need to be supported by new networking capabilities. Caching in conjunction with specific unicast and multicast techniques for ingress and egress traffic can achieve this goal. In this paper we discuss how, explicitly by using cache cooperation techniques, we can deal with heterogeneous content preferences among end users. The paper shows simulation results and discusses relevant parameters with respect to the Internet TV use cases mentioned. Finally, it provides an outlook on the longer term and demonstrates that investment in these new capabilities is future-safe.

NAT Traversing Solutions for SIP Applications

Session Initiation Protocol (SIP) has been proposed for multimedia services and wide-area connectivity in smart home environments (SHEs). An important issue for SIP deployment in SHEs is network address translator (NAT) traversing. SIP and Real-time Transport Protocol (RTP) packets are delivered between an SHE (i.e., private IP network) and Internet (i.e., a public IP network) through an NAT function of a home gateway, and the NAT translates the IP/transport layer address and port number but leaves the application layer content unchanged. This results in inconsistency between the IP addresses/port numbers in the IP/transport layers and those in the SIP layer. To resolve this issue, we describe six solutions including static route, UPnP, STUN, ICE, ALG, and SBC. Then we compare these solutions in terms of smart home appliance (SHA) modification, scope of NATs supported, multilayer NAT traversal, ease of configuration, security issue, and time complexities.

Implementation of the DLNA Proxy System for Sharing Home Media Contents

The paper proposes a methodology to provide services for accessing and sharing various media contents securely, those are distributed over consumer electronics (CEs) in the home network. To do so, we propose the DLNA proxy system (DPS) architecture which helps to gather various media information available from the distributed AV devices in the home and to share the media contents across the public IP network via established secure channels. The proxy system is implemented on the home server which acts as media server and the hardware accelerated IP security (IPSec) virtual private network (VPN) is configured on the home gateway which establishes and maintains secure connections between the home and public networks.

Design of an Extended Architecture for Sharing DLNA Compliant Home Media from Outside the Home

This paper proposes an extended DLNA media sharing architecture as a methodology to provide services for accessing and sharing various media contents distributed over DLNA-capable devices, via not only a home network but also the Internet. The proposed architecture helps users search and view media contents distributed in the DLNA-networked home from public IP networks. Our architecture uses the SIP in order to transmit messages of information exchange between DLNA-capable devices within and outside of the home and to support secure user-authentication. The proposed system was implemented on a home server that acts as a gateway for establishing connections between the home network and external networks.

Optimizing IP networks in a hybrid IGP/MPLS environment

In this paper, we consider a traffic engineering (te) approach toip networks in a hybridigp/mpls environment. Thoughigp (Interior Gateway Protocol) routing has proven its scalability and reliability, effective traffic engineering has been difficult to achieve in public IP networks because of the limited functional capabilities of conventionalip technologies.mpls (Multi-Protocol Label Switching) on the one hand enhances the possibility to engineer traffic onip networks by allowing explicit routes. But on the other hand it suffers from the scalability (n-square) problem. Hybridigp/mpls approaches rely onip native routing as much as possible and usempls only if necessary. In this work we propose a novel hybrid traffic engineering method based on genetic algorithms, which can be considered as an offlinete approach to handle long or medium-term traffic variations in the range days, weeks or months. In our approach the maximum number of hops anlsp (Label Switched Path) may take and the number oflsps which are applied solely to improve the routing performance, are treated as constraints due to delay considerations and the complexity of management. We apply our method to the German scientific network (b-win) for which a traffic matrix is available and also to some other networks with a simple demand model. We will show results comparing this hybridigp/mpls routing scenario with the result of pureigp routing and that of a full meshmpls with and without traffic splitting.

Broadcast quality video over IP

We consider the problem of designing systems for the transmission of video signals of the quality found in current television broadcasts, over high-speed segments of the public IP network. Our most important contribution is the definition of a network/coder interface for IP networks which gathers channel state information, and then sets parameters of the video coder to maximize the quality of the signal delivered to the receiver, while remaining fair to other data or video connections. This interface plays a role analogous to that of a Leaky Bucket controller, in that it specifies traffic shaping parameters which result in simultaneous good Quality-of-Service (QoS) for the source and good network performance. Since the network is not assumed to provide any form of QoS guarantee, fundamental to our construction is a hidden Markov model for the channel, based on which the interface solves a problem of optimal stochastic control, to decide how to configure the encoder. Other contributions are: a) modifications to the standard Internet transport protocol, to make it suitable for the transport of delay-constrained traffic and to gather channel state information, and b) the design of an error-resilient video coder. Experimental studies reveal that the proposed system is able to stream video signals of the quality of current TV-broadcasts, among hosts in wide-area networks connected to the experimental vBNS backbone.

Mobility management in current and future communications networks

This article describes current and proposed protocols for mobility management for public land mobile networks (PLMNs), Mobile IP, wireless ATM, and satellite networks. The integration of these networks is discussed in the context of the next evolutionary step of wireless communications networks. First, a review is provided of location management algorithms for PCS implemented over a PLMN. The latest protocol changes for location registration and handoff are investigated for Mobile IP, followed by a discussion of proposed protocols for wireless ATM and satellite networks. Finally, an outline of open problems to be addressed by the next generation of wireless network service is discussed.