Search results for "kommunikasjon"
showing 10 items of 768 documents
Security in GPRS
2001
Masteroppgave i informasjons- og kommunikasjonsteknologi 2001 - Høgskolen i Agder, Grimstad GPRS offers the user an “always on” connection to Internet and Intranet. Some of the services may require high level of security. This can be financial transaction over the Internet, or exchange of confidential documents from a company’s Intranet to an employee. It is important to have strong focus on the security, so companies and persons that demand high level of security can take advantage of the services GPRS offered. What normally happens is that the services wins against the security. This is in most cases adequate security for what a normal subscriber requires. This thesis covers which securit…
Feasibility study of VoIP in 3GPP UMTS release 5 interworking with fixed networks
2003
Masteroppgave i informasjons- og kommunikasjonsteknologi 2003 - Høgskolen i Agder, Grimstad The Universal Mobile Telecommunications System (UMTS) is denoted as a 3rd generation cellular system and has been designed with the objective to be a system with global coverage. With improvement of bandwidth capabilities, the UMTS system has the ability to support real time multimedia services. The focus in this thesis is Voice over IP (VoIP) which enables a user to make phone calls in the packet switched network in UMTS. This thesis starts with a presentation of VoIP with the quality requirements related to a voice session. A voice conversation needs a guaranteed quality to satisfy the participants…
Management of Quality of Service and other functions in mobile Ad Hoc networks
2003
Masteroppgave i informasjons- og kommunikasjonsteknologi 2003 - Høgskolen i Agder, Grimstad This Masters thesis deals with management of mobile Ad Hoc networks, with main focus on QoS management. The needs for management of such networks and the challenges in managing them are an important part of the theoretical discussion. Different methods like SNMP, ANMP, Guerrilla management and Policy-based management are described and evaluated in order to be used in management of mobile Ad Hoc networks. The task of managing a MANET is important in order to maintain an effective and stable network. Securing the transmission of data and avoiding unauthorized network users are important security tasks.…
Quality of service (QoS) in mobile ad hoc networks
2006
Masteroppgave i informasjons- og kommunikasjonsteknologi 2006 - Høgskolen i Agder, Grimstad Mobile ad hoc networks inherits several of the issues that ordinary wireless networks have and include several new ones. With internet becoming a multi media enviroment, there are many new requirements that must be satisfied, especially when it comes to real time service. Quality of servce protocol for MANETs has been a topic of interest. In this paper I propose a QoS –aware bandwidth protocol based on available bandwidth calculation. My proposal is based on a few existing proposals today and the theory around these. I then show an implementation available bandwidth calculation and routing functions.…
QoS for real-time IP traffic
2001
Masteroppgave i informasjons- og kommunikasjonsteknologi 2001 - Høgskolen i Agder, Grimstad This thesis focuses on three service models, known as Best Effort, IntServ and DiffServ, and their ability of providing QoS in IP networks. The objective is to evaluate the performance of real-time traffic based on theory and testing. In addition, mechanisms that may improve the QoS performance further, like MPLS and Bandwidth Brokers, are evaluated to find a comprehensive solution for different types of IP networks. Tests are set up to focus on typical behavior of the service models, and disclose differences in their efficiency together with problems concerning fairness in the bandwidth sharing. Res…
Migration of VOIP/SIP enterprise solutions towards IMS
2006
Masteroppgave i informasjons- og kommunikasjonsteknologi 2006 - Høgskolen i Agder, Grimstad Voice-over-IP solutions based on SIP and Skype are now widely spread and accepted by end-users. "Traditional Circuit Switched" voice services suffer from declining revenues, high maintenance cost, and a lack of integration with Internet applications. For an enterprise customer it is increasingly difficult to make a decision about which VoIP solution to select. For fixed and mobile operators new solutions based on IMS are on the horizon, and investment strategies for VOIP solutions are difficult. The research project will investigate VoIP/SIP solutions based on open source as a starting point, and out…
Gateway security between Bluetooth and GSM/GPRS
2002
Masteroppgave i informasjons- og kommunikasjonsteknologi 2002 - Høgskolen i Agder, Grimstad The amount of wireless technologies is getting bigger and wider. It is more and more common in everyday use for a huge amount of the people. A cellular phone is something that everyone got in addition to normal access the Internet. So, why not both at the same time. When data is transmitted over the Internet and are communicating with wireless technologies, there are several vulnerable points. There have to be secure data communication, and the security is only something that should lay behind which people do not have to think about. Unfortunately, this is not the way it is, there are different techn…
Personal firewall in mobile phone
2004
Masteroppgave i informasjons- og kommunikasjonsteknologi 2004 - Høgskolen i Agder, Grimstad The assignment described in this master thesis is given by Ericsson AS and gives an evaluation of a need for a personal firewall in mobile phone. In today’s commercial products personal firewall in mobile phone does not exist. This master thesis analyzes the role of personal firewall in different scenarios. At the beginning of the master thesis functions that already exist in personal firewall for PC were discussed in the sense of which could be useful in personal firewall for mobile phone. This master thesis also covers description of connection between personal firewall and virus in addition to wha…
Formation of secure wireless ad-hoc sensor networks
2004
Masteroppgave i informasjons- og kommunikasjonsteknologi 2004 - Høgskolen i Agder, Grimstad Looking into the wireless world today, the most of data/information is transmitted in plaintext over the ether. These sensitive data/information possibly route through several intermediate nodes to a destination. To secure the sensitive data/information, the various ad-hoc technologies like Bluetooth, WLAN and ZigBee have implemented different security mechanisms and routing protocols. But since most wireless ad-hoc networks demand battery driven devices they will have limit resources to provide feasible security. The different technologies will be outlined regarding a set case scenario. We have a pa…
WLAN-GPRS interworking
2001
Masteroppgave i informasjons- og kommunikasjonsteknologi 2001 - Høgskolen i Agder, Grimstad During the last years it has been experienced a huge growth in Internet users. Nearly each household in Norway got a computer attached to the Internet. The trend for further growth seems to be within the concept of mobile Internet, which means that the user can be attached anywhere at any time. The sales of mobile equipments like personal digital assistants (PDAs) and laptops are currently experiencing a great growth. This indicates a need for greater flexibility and mobility and gives therefore a demand for mobile Internet. The motive for this thesis was to investigate the opportunities to offer mob…