0000000000666745
AUTHOR
Ahmad Rahil
IP-Based Mobility Management and Handover Latency Measurement in heterogeneous environments
International audience; One serious concern in the ubiquitous networks is the seamless vertical handover management between different wireless technologies. To meet this challenge, many standardization organizations proposed different protocols at different layers of the protocol stack. The Internet Engineering Task Force (IETF) has different groups working on mobility at IP level in order to enhance mobile IPv4 and mobile IPv6 with different variants: HMIPv6 (Hierarchical Mobile IPv6), FMIPv6 (Fast Mobile IPv6) and PMIPv6 (Proxy Mobile IPv6) for seamless handover. Moreover, the IEEE 802.21 standard provides another framework for seamless handover. The 3GPP standard provides the Access Netw…
Handover management in heterogenous mobile and wireless networks
Since 1990, networking and mobile technologies have made a phenomenal unprecedented progress. This progress has been experienced on multiple fronts in parallel; especially on the application level and the user's needs one. This rapid evolution of the technology imposed a need for the existence of heterogeneous environments where the coverage is ensured throughout the different available networks. The challenge with such architecture would be to provide the user with the ability to navigate through the different available networks in a transparent and seamless fashion. However, the navigation among different types of networks is commonly referred to as vertical Handover. The IEEE 802.21 stan…
Towards an Understanding of the Causes of Difficulties in Debugging
Debugging remains one of the areas that have seen little progress since the early days of programming. We argue that the academic approach of observational studies is incapable of capturing the essence of debugging in complex software. Instead, reflections by programmers may provide a better description of the debugging nature and challenges. In this article, we describe a study where we capture the reflections of programmers on thorny bugs that exemplify the major sources of difficulties in debugging. More importantly, we provide suggestions on what could have been done to avoid such thorny bugs from occurring with the same level of difficulties. As a major conclusion, we argue that the be…
Statistical learning and multiple linear regression model for network selection using MIH
Award of Appreciation; International audience; A key requirement to provide seamless mobility and guaranteeing Quality of Service in heterogeneous environment is to select the best destination network during handover. In this paper, we propose a new schema for network selection based on Multiple Linear Regression Model (MLRM). A horough investigation, on a huge live data collected from GPRS/UMTS networks led to identify the Key Performance Indicators (KPIs) that play the most important role in the handover process. These KPIs are: Received Signal Code Power (RSCP), received energy per chip (Ec/No) and Available Bandwidth (ABW) of the destination network. To extract a handover model from col…