The InfoSec Handbook

Computer scienc

Heterogeneous networks using mobile-IP technology

Whenever a mobile user moves between networks a handover must occur. This basically means that a network-layer protocol must handle the moving of the mobile device. In a cellular phone a GSM/UMTS infrastructure performs horizontal handover and the user does not notices any call or ongoing session interruption while roaming. The handover procedure begins when the received signal strength identificator (RSSI) of a mobile device falls below a level, it discovers a neighbour access point with better quality of services (QoS) than its current access point. In heterogeneous wireless networks different portions of RF spectrum are used and is difficult or impossible for a mobile node to concurrently maintain its connectivity without signal interruptions. Thus, the different network environments must be integrated and support a common platform to achieve seamless handover. The seamless or vertical handover's target is to maintain the mobile user's IP address independently of user's location or of the physical parameters the current network is using. A mechanism that keeps a mobile device to an ongoing connection by maintaining its home-location IP address is the Mobile-IP protocol which operates at the network-layer of the Open System Interconnection (OSI) model. In this M.Sc. thesis we perform heterogeneous network scenarios with the Mobile-IP technology. Moreover, we have built the system practically and assist the applicability of such heterogeneous wireless networks through real-side measurements. We used Linux operating system (Ubuntu & Debian) between different network technologies, made at the National Center for Scientific Research (NCSR) ''Demokritos'' institute, in Greece. The required applications for the Mobile-IP and 3G technologies were implemented and configured in a platform of fixed and mobile devices at Demokrito's departmental laboratory. The idea of using the Mobile-IP protocol was to gather information about time differences that occurred in handover delay between different networks.fi=Opinnäytetyö kokotekstinä PDF-muodossa.|en=Thesis fulltext in PDF format.|sv=Lärdomsprov tillgängligt som fulltext i PDF-format

HUC-HISF: A Hybrid Intelligent Security Framework for Human-centric Ubiquitous Computing

制度:新 ; 報告番号:乙2336号 ; 学位の種類:博士(人間科学) ; 授与年月日:2012/1/18 ; 早大学位記番号:新584

The InfoSec Handbook

Computer scienc

Design and development of a software architecture for seamless vertical handover in mobile communications

In this work I firstly present an overview on current wireless technology and network mobility focusing on challenges and issues which arise when mobile nodes migrate among different access networks, while employing real-time communications and services. In literature many solutions propose different methods and architectures to enhance vertical handover, the process of transferring a network communication between two technologically different points of attachment. After an extensive review of such solutions this document describes my personal implementation of a fast vertical handover mechanism for Android smartphones. I also performed a reliability and performance comparison between the current Android system and my enhanced architecture which have both been tested in a scenario where vertical handover was taking place between WiFi and cellular network while the mobile node was using video streaming services. Results show the approach of my implementation to be promising, encouraging future works, some of which are suggested at the end of this dissertation together with concluding remarks

IP addressing, transition and security in 5G networks

The number of devices on the Internet is always increasing and there is need for reliable IP addressing. 5G network will be built on two main technologies; SDN and NFV which will make it elastic and agile compared to its predecessors. Elasticity will ensure that additional devices can always be added to the network. IPv4 addresses are already depleted and cannot support the expansion of the Internet to ensure the realization of future networks. IPv6 addressing has been proposed to support 5G networking because of the sufficient number of addresses that the protocol provides. However, IPv4 addressing will still be used concurrently with IPv6 addressing in networks until they become fully IPv6 based. The structure of IPv4 header is different from IPv6 header hence the two protocols are incompatible. There is need for seamless intercommunication between devices running IPv4 and IPv6 in future networks. Three technologies namely; Dual Stack, Tunneling and Translation have been proposed to ensure that there is smooth transition from IPv4 to IPv6 protocol. This dissertation demonstrates Tunneling of IPv6 over IPv4. Also, this research work reviews network security threats of past networks that are likely to be experienced in 5G networks. To counter them, reliable IP security strategies used in current networks are proposed for use in next generation networks. This dissertation evaluates and analyzes IPv4, IPv6 network and Tunneling models in an SDN network environment. The performance of an IPv4 only network is compared to the IPv6 only network. Also, devices addressed with both protocols are connected. The results obtained illustrate that IPv4 and IPv6 devices can effectively communicate in a 5G network environment. In addition, a tunnel is used to run IPv6 protocol over an IPv4 network. The devices on both ends of the tunnel could communicate with each other effectively