Browsing by Subject "GSM"
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Item Open Access Contextproxy : a location-aware HTTP proxy server to support web based context-aware services and applications(Bilkent University, 2005) Uluçınar, Alper RifatThe pervasion of computing in our physical world promises more than the ubiquitous availability of computing resources; totally new and exciting interaction schemes are to be explored. Context-awareness, one of the most important aspects of ubiquitous computing, enables applications that make use of their users’ context to provide dynamically adapting information and services to their users or to other applications. Although the technological infrastructure to support ubiquitous and context-aware applications is being deployed rapidly, the standards and the best practices for the interactions of various components in a context-aware application are still missing. In our work we have developed a location-aware HTTP proxy server, called ContextProxy that runs on the popular Symbian platform. ContextProxy acts as a standard HTTP proxy server from the client application’s perspective but it augments the service request of the client with the available location information while submitting the request to the service provider. This allows the existing nomadic applications to immediately become locationaware if they can be configured to make use of a standard HTTP proxy which is a common scheme for web based applications. And also it is possible to write new nomadic applications without considering the context-awareness aspect at the service requestor level. The contextual information added by ContextProxy can then be utilized by the service provider to dynamically adapt its services according to the service requestor’s context.Item Open Access GSM and UMTS mobility simulator(Bilkent University, 2005) Öner, MehmetIn this thesis, a mobility simulator for GSM and UMTS has been designed and implemented using Visual C#.Net. The objective has been to design and implement such a simulator that can be used to create and study different traffic load scenarios and mobility patterns that can cause congestion situations. The modular approach adopted for the GSM and UMTS simulator allow us to evaluate the performance of new services. The simulator uses propagation simulation results and terrain profile data to produce capacity and performance metrics related to GSM and UMTS networks. The capacity and the service quality of the network are assessed in a long-term system level simulation scheme. Mobility generation is the core of the simulator program. It generates random paths for the mobile users in the simulation. Then the effects of the mobility patterns of the users on the system capacity are investigated. In GSM mobility simulator, mobility, traffic generation, call-admission and handover are implemented. In UMTS, in addition to GSM modules, power control and soft handover generation is implemented.Item Open Access Guap-A strong user authentication protocol for GSM(Bilkent University, 2005) Aydemir, ÖzerTraditionally, the authentication protocols for cellular phone networks have been designed for device authentication rather than user authentication, which brings limitations and restrictions on the functionality of the system. In this thesis we propose a user authentication protocol for GSM (Global System for Mobile) based cellular phone networks. Our protocol permits the use of weak secrets (e.g. passwords or PINs) for authentication and provides certain flexibilities for GSM users. The simulation results on currently established user authentication protocols and GUAP are presented. Our proposal also has a capture resilience extension to disable captured cellular phones securely.Item Open Access A strong user authentication protocol for GSM(IEEE, 2005-06) Aydemir, Özer; Selçuk, Ali AydınTraditionally, the authentication protocols for cellular phone networks have been designed for device authentication rather than user authentication, which brings certain limitations and restrictions on the functionality of the system. In this paper we propose a user authentication protocol for the Global Standards for Mobile (GSM) which permits the use of weak secrets (e.g. passwords or PINs) for authentication, providing new flexibilities for the GSM users. © 2005 IEEE.