Nesta dissertação são analisados os impactos da implantação de medidas de gerenciamento da mobilidade (GM) em uma área urbana localizada na cidade de Porto Alegre com vários pólos atratores de viagens. O GM – abordagem européia do gerenciamento da demanda de viagens – busca uma mobilidade urbana mais sustentável, tentando influir no comportamento de viagem das pessoas. São discutidos seu conceito, suas ferramentas, medidas e serviços de transporte, incluindo exemplos de implantação no mundo. Foram escolhidas duas medidas de GM, dentro de um pacote de medidas a serem implantadas pelo projeto Moviman na área de estudo, localizada na zona leste de Porto Alegre, onde atualmente há uma universidade (PUCRS), hospitais, um shopping center, hipermercados, entre outros estabelecimentos. A primeira medida analisada foi a carona programada, uso compartilhado de um automóvel com divisão de custos. Foi feita uma pesquisa com alunos da PUCRS para verificar sua receptividade em relação a esta medida. A partir dos resultados desta pesquisa, foi avaliado o possível impacto da implantação desta medida no tráfego da área de estudo. Também foi feita pesquisa com trabalhadores de uma empresa local para comparar a receptividade a esta medida por usuários diferentes. A segunda medida foi a implantação de um Sistema de Informação ao Usuário (SIU) de transporte coletivo em duas paradas de ônibus, através da realização de pesquisas de importância e satisfação, para priorizar as informações e de uma pesquisa final de satisfação e análise de intenção de mudança modal causada pelo SIU. Os resultados demonstram que a carona programada é uma medida com boa receptividade entre os grupos-alvo pesquisados, que causa uma melhora das condições de tráfego locais. E um novo SIU nas paradas de ônibus é uma medida de qualificação do transporte coletivo com um bom potencial de atração de novos usuários e de fidelização dos atuais. Portanto, comprovouse o impacto positivo da implantação destas medidas de GM em uma cidade brasileira, pois ambas atenderam aos objetivos de uma mobilidade urbana sustentável sem a limitação da mobilidade das pessoas. / This dissertation presents the evaluation of the impacts produced by mobility management (MM) measures introduced in an urban area, with many trip production centers, located in Porto Alegre city, southern Brazil. The MM, European approach of travel demand management, aims a more sustainable urban mobility, trying to influence in the travel behavior of people. Their concepts, tools, measures and transport services are discussed, including other implantation examples worldwide. Two MM measures were chosen within a package of measures that would be implemented by the Moviman project in the studied area. The selected area, situated in the east zone of Porto Alegre, holds a university (PUCRS), hospitals, a shopping center, among others commercial establishments. The first analyzed measure was carpooling, shared use of an automobile with division of costs, using the application of a survey with university students, from PUCRS, to verify their receptivity in relation to this alternative transportation mode. The survey results were used for the analysis of possible impacts of this measure in the traffic of the study area. A survey with workers of a local company was done to compare the receptivity with these measures in distinct users. The second measure was the installation of a public transport user information system (UIS) in two bus stops, using importance and satisfaction surveys in order to define information priorities, and a final survey of satisfaction and analysis of modal change intention caused by UIS. The results demonstrate that carpooling is a transport measure with good receptivity among the target groups, and improves the local traffic conditions. Moreover the installation of new UIS in bus stops is a measure of qualification of the public transportation with good potential for attraction of new users and consolidation of actual users. Therefore, the impacts of MM measures in a Brazilian city were positive, considering that both measures reach the goal of sustainable mobility without limiting people mobility.

Next generation heterogeneous wireless networks are expected to interwork with Internet Protocol (IP)-based infrastructures. Conventional network services operate like silos in that a specific set of services are offered over a specific type of access network. As access networks evolve to provide IP-based packet access, it becomes attractive to break these “service silos” by offering a converged set of IP-based services to users who may access these services using a number of alternative access networks. This trend has started with third generation cellular mobile networks, which have standardized on the use of the IP Multimedia Subsystem (IMS) to manage user access to a wide variety of multimedia services over the mobile Internet, while facilitating interworking of heterogeneous wireless and landline access networks. The future users of communication systems will subscribe to both IP-based and Circuit Switched (CS) based services and in the foreseeable future a single database that handles user profiles across all domains will be required. Home Subscriber Server (HSS) as an evolved version of Home Location Register (HLR) is one of the key components of IMS. In deploying HSS as a central repository database, in a fully overlapped heterogeneous network setting, changes of access mode are very frequent and conveying this information to HSS imposes excessive signaling load and delay. In our proposed scheme we introduce an Interface Agent (IA) for each location area that caches the location and information about the access mode through which a user can be reached. This method results in significant amount of savings in signaling cost and better delay performance. The existing call delivery approaches in cellular networks may not be well suited for future communication systems because they suffer from unnecessary usage of network resources for call attempts that may fail which adds to excessive signaling delays and queuing costs. Reducing the number of queries and retrievals from the database will have a significant impact on the network performance. We present a new scheme based on Reverse Virtual Call setup (RVC) as a solution to the call delivery problem in heterogeneous wireless networks and evaluate the performance of this framework. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

Vehicular networks are an emerging technology that offer potential for providing a variety of new services. However, extending vehicular networks to include IP connections is still problematic, due in part to the incompatibility of mobile IP handovers with the increased mobility of vehicles. The handover process, consisting of discovery, registration, and packet forwarding, has a large overhead and disrupts connectivity. With increased handover frequency and smaller access point dwell times in vehicular networks, the handover causes a large degradation in performance. This thesis proposes a predictive handover solution, using a combination of a Kalman filter and an online hidden Markov model, to minimize the effects of prediction errors and to capitalize on advanced handover registration. Extensive simulated experiments were carried out in NS-2 to study the performance of the proposed solution within a variety of traffic and network topology scenarios. Results show a significant improvement to both prediction accuracy and network performance when compared to recent proposed approaches.

The demand for higher data rates for indoor and cell-edge users led to evolution of small cells. LTE femtocells, one of the small cell categories, are low-power low-cost mobile base stations, which are deployed within the coverage area of the traditional macro base station. The cross-tier and co-tier interferences occur only when the macrocell and femtocell share the same frequency channels. Open access (OSG), closed access (CSG), and hybrid access are the three existing access-control methods that decide users' connectivity to the femtocell access point (FAP). We define a network performance function, network productivity, to measure the traffic that is carried successfully. In this dissertation, we evaluate call mobility in LTE integrated network and determine optimized network productivity with variable call arrival rate in given LTE deployment with femtocell access modes (OSG, CSG, HYBRID) for a given call blocking vector. The solution to the optimization is maximum network productivity and call arrival rates for all cells. In the second scenario, we evaluate call mobility in LTE integrated network with increasing femtocells and maximize network productivity with variable femtocells distribution per macrocell with constant call arrival rate in uniform LTE deployment with femtocell access modes (OSG, CSG, HYBRID) for a given call blocking vector. The solution to the optimization is maximum network productivity and call arrival rates for all cells for network deployment where peak productivity is identified. We analyze the effects of call mobility on network productivity by simulating low, high, and no mobility scenarios and study the impact based on offered load, handover traffic and blocking probabilities. Finally, we evaluate and optimize performance of fractional frequency reuse (FFR) mechanism and study the impact of proposed metric weighted user satisfaction with sectorized FFR configuration.

Klimatförändringar är ett världsomfattande problem som kräver åtgärder på alla nivåer i samhället. Sättet människor reser och förflyttar sig på idag har en stor inverkan på klimatet och en omställning behövs som är kopplat till människors beteenden och attityder angående detta. Mänskligt beteende är dock komplext och påverkas av flera faktorer.  Syftet med denna uppsats är att undersöka hur svenska kommuner tar sig an utmaningen med att få medborgare inom kommunen att ställa om till ett mer hållbart resande avseende gång, cykel och kollektivtrafik, samt hur hållbart resande ramas in i relation till klimatförändringar. Resultatet visar på att personliga aspekter i människors vardagsliv och livssituation är den största utmaningen för kommunerna att påverka, för att få människor att ställa om sin livsstil i en mer hållbar riktning. Strategier som används för att komma över dessa barriärer, är då att underlätta för individen att resa hållbart genom satsningar på infrastrukturen, att motivera och engagera medborgare genom diverse kampanjer, genom kommunikation och information samt att rikta in sig på särskilda grupper i samhället. Avseende inramningen av klimatförändringar i hållbarhetsarbetet kan det konstateras att klimatförändringar ramas in i andra ändamål som människor lättare kan applicera till då det ger större effekt på människors beteende än att prata i termer om klimatet.

Avec la prolifération des appareils mobiles, la mobilité devient une exigence et une caractéristique incontournable pour 5G. Cependant, en dépit des efforts pour permettre la mobilité dans le réseau IP, les solutions sont anchor-basées et inefficaces. Dans ce contexte, le réseau centré sur l'information (ICN) est proposé. Alors que ICN soutient mieux la mobilité, certains défis restent sans solution pour une mobilité transparente. La thèse explore trois défis de ce type et propose solutions efficaces. Tout d'abord, pour résoudre la mobilité des producteurs, MapMe, un protocole de gestion de micro mobilité compatible avec trafics latence-sensibles est proposée. MAP-Me est sans anchor et préserve les avantages de l'ICN. Les résultats de simulation montrent que MAP-Me surpasse les autres solutions en matière de performances client tout en gardant bas les frais de réseau sur diverses conditions réseau. En plus, nous étudions la sécurité de mobilité des producteurs. Nous nous concentrons sur l'attaque de préfixe hijacking, qui est à la base de plusieurs attaques. Pour éviter cette attaque, nous proposons un protocole léger et distribué basé sur hash-chaining. Les premiers résultats montrent une amélioration significative des frais de vérification. Enfin, il faut d'autres mécanismes dans la couche transport pour ICN mobile. Nous proposons WLDR et MLDR pour la détection et la récupération des pertes dans le réseau afin de faciliter le contrôle de la congestion. Les résultats de simulation montrent une réduction significative du temps d'écoulement (jusqu'à 20%). / With the proliferation of mobile devices, mobility becomes a requirement and a compelling feature for 5G. However, despite tremendous efforts in the last 2 decades to enable mobility in IP network, the solutions are mostly anchor-based and inefficient. In this context, Information-Centric networking (ICN) is proposed. While ICN has some native support of mobility, other architectural challenges remain unsolved to achieve seamless mobility. The thesis explores 3 main challenges of such and contributes novel solutions. First, to solve producer mobility, MapMe, a micro mobility management protocol supporting latency sensitive traffic is proposed. MAP-Me is anchorless and preserves key ICN benefits. Simulation results show that MAP-Me outperforms existing work in user performance while retaining low network overheads in various network conditions. Second, we investigate security in producer mobility. We focus on prefix hijacking attack, which is a basis of several attacks. To prevent prefix hijacking, we propose a light-weight and distributed prefix attestation protocol based on hash-chaining. First results show significant improvement in verification overhead. It is resistant to replay-based prefix hijacking. Finally, additional transport-layer mechanisms are needed in mobile ICN. To this aim, we investigate alleviating the adverse effect of wireless/mobility loss on congestion control. We propose WLDR and MLDR for in-network loss detection and recovery to facilitate congestion control. Simulation results show a significant reduction in flow completion time (up to 20%).

The present study examines a Mobility Management measure called “test traveller project”, which aims at increasing the public transport modal share by offering free public transport tickets to those who often use their car for their daily commuting and trips. The existing literature consists of a rather limited number of cases and their scope is usually limited because only some of the main elements that influence one’s travel behaviour are considered in each study. Furthermore, literature is not unanimous in concluding that this measure can reduce car use. This work studies more than 50 cases in Sweden, and by employing the Theory of Planned Behaviour the effects of test traveller projects have been examined in an empirical case in the Swedish municipality of Botkyrka, located in the Stockholm metropolitan area. The findings underline that a test traveller project, despite its limitations, may be a valid and relatively simple tool available to public bodies and public transport companies for enticing a segment of car drivers to switch to public transport where it is a valid alternative. In fact, according to the literature, the major results achievable are around 20% of new public transport users among test travellers, whereas in Sweden 20% has been achieved by the first upper quartile of the projects. In particular, the effectiveness of a test traveller project is greater when combined or conducted in parallel with other measures such as improvements in the public transport offer and/or changes in the transport system aiming at disadvantaging car use. The case study of Botkyrka has confirmed that attitudes are the major influencing factor when making the transport mode choice. Further, it has confirmed that environmental concerns and the time passed from one’s residential relocation also play an important role. Habits seem to be less important, thus adhering to that literature whose authors argue that an external event (such as moving home) makes people reflect upon and rethink their travel habits. The case study in Botkyrka has empirically demonstrated how the project participants correct their beliefs and perceptions about public transport, sometimes in a positive way and sometimes in a negative way. An interesting finding is the existence of a new category of people living in the suburbs. Literature indicates that, in the same suburban context, individuals with suburban land use preferences tend to use the car more that individuals with urban land use preferences. In the case study of Botkyrka clearly emerged as a majority among the test traveller project participants a category of individuals who have a suburban land use preference but at the same time would like to use public transportation instead of their car and have high environmental concerns.

Based on the targets outlined by the EU Horizon 2020 (H2020) framework, it is expected that heterogeneous networking will play a crucial role in delivering seamless end-to-end ubiquitous Internet access for users. In due course, the current GSM-Railway (GSM-R) will be deemed unsustainable, as the demand for packet-oriented services continues to increase. Therefore, the opportunity to identify a plausible replacement system conducted in this research study is timely and appropriate. In this research study, a hybrid satellite and terrestrial network for enabling ubiquitous Internet access in a high-speed train environment is investigated. The study focuses on the mobility management aspect of the system, primarily related to the handover management. A proposed handover strategy, employing the RACE II MONET and ITU-T Q.65 design methodology, will be addressed. This includes identifying the functional model (FM) which is then mapped to the functional architecture (FUA), based on the Q.1711 IMT-2000 FM. In addition, the signalling protocols, information flows and message format based on the adopted design methodology will also be specified. The approach is then simulated in OPNET and the findings are then presented and discussed. The opportunity of exploring the prospect of employing neural networks (NN) for handover is also undertaken. This study focuses specifically on the use of pattern classification neural networks to aid in the handover process, which is then simulated in MATLAB. The simulation outcomes demonstrated the effectiveness and appropriateness of the NN algorithm and the competence of the algorithm in facilitating the handover process.

The inherent broadcast nature of satellites, their global coverage and direct access to a large number of subscribers give satellites unrivalled advantages in supporting IP multicast applications. A new generation of satellite systems that support regenerative on-board processors and multiple spot beam technology have opened new possibilities of implementing IP multicast communication over satellites. These new features enable satellites to make efficient use of their allocated bandwidth resources and provide cost effective network services but equally, create new challenges for mobile satellite terminals. IP mobility support in general and IP mobile multicast support in particular on mobile satellite terminals like the ones mounted on continental flights, maritime vessels, etc., still remain big challenges that have received very little attention from the research community. Up till now, there are no proposed mechanisms to support IP multicast for mobile receivers/sources in multi-beam satellite networks in open literature. This study explores the suitability of IP multicast mobility support schemes defined for terrestrial networks in a satellite environment and proposes novel schemes based on the concepts of Home and Remote subscription-based approaches, multiple interface and PMIPv6 protocol. Detailed analysis and comparison of results obtained from the proposed schemes, Mobile IP (MIP) Home and Remote subscription-based approaches (for terrestrial networks) when implemented on a reference multi-beam satellite network are presented. From these results, the proposed schemes outperform the MIP Home and Remote subscription-based approaches in terms of gateway handover latency, number of multicast packets lost and signalling cost over the satellite air interface.

No / For decades, the development of the Internet was driven by the purpose of providing applications to non-mobile users. No specific Quality of Service (QoS) requirement is necessary, other than ensuring reliability in the end-to-end data transfers. As such, best effort service model was deemed more than appropriate to satisfy the users' needs. Nevertheless, the scenario has changed in the last few years. A new population of nomadic users, who requires access to Internet services regardless of their location and mode of transportation is growing, while new typologies of Internet applications are being continuously developed, in which best effort service level may no longer be adequate. The SUITED project has been devised to address the emerging issues generated by this new and challenging scenario. SUITED aims at contributing towards the design and deployment of the Global Mobile Broadband System (GMBS), a unique satellite/terrestrial infrastructure, which will ensure that nomadic users have access to Internet services with a negotiated QoS. An overview of the main results achieved in the SUITED project is provided in this article. Some of the most innovative solutions developed by the SUITED team for the joint management of global mobility and end-to-end QoS support are presented. The SUITED demonstrator platform, which was developed to validate the system specifications, is also described. Finally, the results of the experimental measurement campaigns carried out with this platform are reported.