Dans cette thèse, nous analysons la dynamique de systèmes à événements discrets avec synchronisation et priorités, au moyen de réseaux de Petri et de réseaux de files d'attente.Nous appliquons cela à l'évaluation de performance d'un centre d'appels d'urgence.Notre motivation de départ est pratique. Pendant la durée de ce travail, un nouveau centre d'appels d'urgence a été mis en place pour l'agglomération parisienne, traitant les appels pour la police et les pompiers.La nouvelle organisation traite les appels en deux niveaux.Un premier niveau d'opérateurs répond aux appels, identifie les appels urgents et traite les appels non urgents.Les opérateurs de second niveau sont spécialistes (policiers ou pompiers) et traitent les demandes d'intervention.Quand un appel est identifié au niveau 1 comme très urgent, l'opérateur reste en ligne avec l'appelant jusqu'à ce qu'un opérateur de niveau 2 réponde. De plus, l'appel est prioritaire.Une conséquence de cette procédure est que, lorsqu'aucun opérateur de niveau 2 n'est disponible, les opérateurs de niveau 1 attendent avec ces appels très urgents, et la capacité du niveau 1 diminue.Nous nous intéressons à l'évaluation de performance de divers systèmes correspondant à cette description générale, dans des situations de saturation.Nous proposons trois modèles différents pour traiter ce type de systèmes.Les deux premiers sont des modèles de réseaux de Petri temporisés.Nous enrichissons les classiques réseaux de Petri à choix libres en autorisant des situations de conflit où le routage est résolu par des priorités.La principale difficulté est alors que l'opérateur de la dynamique n'est plus monotone.Dans un premier modèle, nous proposons une dynamique discrète pour cette classe de réseaux de Petri, avec des temps de séjour constants sur les places.Nous prouvons que les variables compteurs d'une exécution du réseau sont les solutions d'un système affine par morceaux, avec retards.Nous étudions les régimes stationnaires de cette dynamique, et caractérisons les régimes affines comme solutoins d'un système affine par morceaux, qui peut être vu comme un système sur le semi-corps de germes tropical (min plus).Les applications numériques montrent cependant que la convergence ne se fait pas toujours vers ces régimes stationnaires affines.Le second modèle est une transformation continue du précédent. Pour la même classe de réseaux de Petri, nous proposons une dynamique sous forme d'équations différentielles discontinues.Nous établissons l'existence et l'unicité de la solution.L'objectif de cette modélisation est d'obtenir un système plus simple dans lequel les pathologies du temps discret disparaissent. Nous montrons que les régimes stationaires sont les mêmes que ceux de la dynamique discrète. Les simulations numériques semblent montrer que la convergence s'obtient effectivement dans ce cas.Nous modélisons aussi le centre d'appels d'urgence comme un réseau de files d'attente, prenant ainsi en compte le caractère aléatoire des différentes variables du centre d'appel.Pour ce système, nous prouvons que la dynamique, après une transformation d'échelle, converge vers une limite fluide, qui correspond au système d'équations différentielles précédent.Cela conforte notre seconde modélisation.Les principaux outils de la preuve de convergence sont le calcul stochastique pour les processus de Poisson, les formulations de Skorokhod généralisées, ou encore des arguments de couplage.Ainsi, nos trois modèles d'un même centre d'appels d'urgence définissent un même comportement asymptotique schématique, décrivant différentes phases de congestion du centre.Dans une seconde partie de cette thèse, nous analysons des simulations poussées, prenant en compte les nombreux détails de notre étude de cas. Les simulations confirment le comportement schématique prédit par nos modèles mathématiques. Nous discutons aussi des interactions complexes provenant de la nature hétérogène du niveau 2. / In this thesis, we analyze the dynamics of discrete event systems with synchronization and priorities, by the means of Petri nets and queueing networks.We apply this to the performance evaluation of an emergency call center.Our original motivation is practical. During the period of this work, a new emergency call center became operative in Paris area, handling emergency calls to police and firemen.The new organization includes a two-level call treatment. A first level of operators answers calls, identifies urgent calls and handles (numerous) non-urgent calls.Second level operators are specialists (policemen or firemen) and handle emergency demands.When a call is identified at level 1 as extremely urgent, the operator stays in line with the call until a level 2 operator answers. The call has priority for level 2 operators.A consequence of this procedure is that, when level 2 operators are busy, level 1 operators wait with extremely urgent calls, and the capacity of level 1 diminishes.We are interested in the performance evaluation of various systems corresponding to this general description, in stressed situations.We propose three different models addressing this kind of systems.The first two are timed Petri net models.We enrich the classical free choice Petri nets by allowing conflict situations in which the routing is solved by priorities.The main difficulty in this situation is that the operator of the dynamics becomes non monotone.In a first model, we consider discrete dynamics for this class of Petri nets, with constant holding times on places.We prove that the counter variables of an execution of the Petri net are solutions of a piecewise linear system with delays.As far as we know, this proof is new, even for the class of free choice nets, which is a subclass of ours.We investigate the stationary regimes of the dynamics, and characterize the affine ones as solutions of a piecewise linear system, which can be seen as a system over a tropical (min-plus) semifield of germs.Numerical experiments show that, however, convergence does not always holds towards these affine stationary regimes.The second model is a ``continuization'' of the previous one. For the same class of Petri nets, we propose dynamics expressed by differential equations, so that the tokens and time events become continue.For this differential system with discontinuous righthandside, we establish the existence and uniqueness of the solution.By using differential equations, we aim at obtaining a simpler model in which discrete time pathologies disappear. We show that the stationary regimes are the same as the stationary regimes of the discrete time dynamics.Numerical experiments tend to show that, in this setting, convergence effectively holds.We also model the emergency call center described above as a queueing system, taking into account the randomness of the different call center variables.For this system, we prove that, under an appropriate scaling, the dynamics converges to a fluid limit which corresponds to the differential equations of our Petri net model.This provides support for the second model.Stochastic calculus for Poisson processes, generalized Skorokhod formulations and coupling arguments are the main tools used to establish this convergence.Hence, our three models of an identical emergency call center yield the same schematic asymptotic behavior, expressed as a piecewise linear system of the parameters, and describing the different congestion phases of the system.In a second part of this thesis, simulations are carried out and analyzed, taking into account the many subtleties of our case study (for example, we construct probability distributions based on real data analysis).The simulations confirm the schematic behavior described by our mathematical models.We also address the complex interactions coming from the heterogeneous nature of level 2.

Les réseaux de cinquième génération sont en cours de définition et leurs différentes composantes commencent à émerger: nouvelles technologies d'accès à la radio, convergence fixe et mobile des réseaux et virtualization.Le contrôle et la gestion de bout en bout (E2E) du réseau ont une importance particulière pour les performances du réseau. Cela étant, nous segmentons le travail de thèse en deux parties: le réseau d’accès radio (RAN) axé sur la technologie MIMO Massif (M-MIMO) et la connexion E2E du point de vue de la couche transport.Dans la première partie, nous considérons la formation de faisceaux focalisés avec un structure hiérarchique dans les réseaux sans fil. Pour un ensemble de flots donnée, nous proposons des algorithmes efficaces en terme de complexité pour une allocation avec alpha-équité. Nous proposons ensuite des formules exactes pour la performance au niveau du flot, à la fois pour le trafic élastique (avec une équité proportionnelle et équité max-min) et le trafic en continu. Nous validons les résultats analytiques par des simulations.La seconde partie de la thèse vise à développer une fonction de réseau auto-organisant (SON) qui améliore la qualité d'expérience (QoE) des connexions en bout-en-bout. Nous considérons un service de type vidéo streaming et développons une fonctionnalité SON qui adapte la QoE de bout-en-bout entre le serveur vidéo et l'utilisateur. La mémoire-tampon reçoit les données d'un serveur avec une connexion E2E en suivant le protocole TCP. Nous proposons un modèle qui décrit ce comportement et nous comparons les formules analytiques obtenues avec les simulations. Enfin, nous proposons un SON qui donne la qualité vidéo de sorte que la probabilité de famine soit égale à une valeur cible fixée au préalable. / Fifth generation networks are being defined and their different components are beginning to emerge: new technologies for access to radio, fixed and mobile convergence of networks and virtualization.End-to-end (E2E) control and management of the network have a particular importance for network performance. Having this in mind, we segment the work of the thesis in two parts: the radio access network (RAN) with a focus on Massive MIMO (M-MIMO) technology and the E2E connection from a point of view of the transport layer.In the first part, we consider hierarchical beamforming in wireless networks. For a given population of flows, we propose computationally efficient algorithms for fair rate allocation. We next propose closed-form formulas for flow level performance, for both elastic (with either proportional fairness and max-min fairness) and streaming traffic. We further assess the performance of hierarchical beamforming using numerical experiments.In the second part, we identify an application of SON namely the control of the starvation probability of video streaming service. The buffer receives data from a server with an E2E connection following the TCP protocol. We propose a model that describes the behavior of a buffer content and we compare the analytical formulas obtained with simulations. Finally, we propose a SON function that by adjusting the application video rate, achieves a target starvation probability.

Orientador: Regiane Helena Bertagna / Resumo: A presente pesquisa tem o objetivo de analisar as percepções dos professores que fazem parte do Programa de Ensino Integral do Estado de São Paulo (PEI) e que participam da avaliação de desempenho que faz parte do PEI, denominada “Avaliação 360 graus”, colocando a educação e as relações desses profissionais sob a ótica do gerencialismo, tendo como principais objetivos a obtenção do alcance de metas na lógica do mercado empresarial. Para que isso ocorra, é necessário medir e avaliar o trabalho que é realizado pelos profissionais e se os mesmos correspondem com o perfil esperado pela escola para garantir resultados satisfatórios. Nesse contexto, a Avaliação de Desempenho, utilizada no setor administrativo, é introduzida no ambiente escolar, avaliando os professores através de um processo que, em teoria, deve colaborar com sua formação profissional, com a reflexão sobre seu trabalho e o apontamento de melhorias. A pesquisa foi desenvolvida com o aporte de referências bibliográficas tanto na área de educação quanto de administração, além dos documentos que embasam a implantação e o funcionamento do Programa de Ensino Integral do Estado de São Paulo, Programa esse que utiliza como Avaliação de Desempenho um método específico chamado de “Avaliação 360 graus”. Como foco maior dessa pesquisa, a análise do instrumento inserido no PEI se dá através das percepções de seis professores com relação ao instrumento adotado para avaliar seu desempenho e ao processo de avaliação. Os participan... (Resumo completo, clicar acesso eletrônico abaixo) / Mestre

Solicitud de envío manuscrito de artículo científico. / En Latinoamérica, en los últimos años, se han aplicado evaluaciones de desempeño docente. Dado ese contexto, en algunos países como Chile y México, se ha evidenciado una actitud negativa de los docentes y de incertidumbre frente a esta evaluación (Schulmeyer, 2002). En el caso peruano, por ejemplo, en el 2017, aproximadamente 238 mil docentes realizaron una de las huelgas magisteriales más grandes, donde reclamaron la derogatoria de la EDD (Fowks, 2017). Esta situación internacional evidencia la importancia de investigar las diversas aristas de esta problemática. En ese marco, se realizó esta investigación con el objetivo de explorar las creencias y las atribuciones causales que los docentes de escuelas bilingües rurales-multigrado de Nivel Primaria de la región Áncash manejan sobre esta evaluación. Se eligieron las creencias y las atribuciones causales como elementos teóricos, porque ambos son constructos que son complmentarias y que permiten estudiar las percepciones acerca de un fenómeno. A partir de ello, se realizó este estudio cualitativo con una aproximación fenomenológica y se utilizaron algunas herramientas de la teoría fundamentada. Luego de definir este presupuesto metodológico, se llevaron a cabo cinco entrevistas semiestructuradas a docentes de este tipo de escuelas. Después del análisis, se evidenció que los participantes asumen que su experiencia en aula, su preparación y su formación inicial constituyen causales de éxito o fracaso al momento de afrontar la EDD. Asimismo, se identificó cierto nivel de desconfianza en cuanto a la finalidad de la evaluación, ya que se halló que algunos docentes creen que esta evaluación probablemente busque el despido de los docentes. Por último, se encontró que algunos docentes creen que algunas características de sus estudiantes de las escuelas en las que trabajan y el tiempo asignado a la evaluación influirían en su desempeño al momento de afrontar la EDD. / In Latin America, in recent years, teacher performance evaluations have been applied. Given this context, some countries such as Chile and Mexico have shown a negative attitude of teachers and uncertainty regarding this evaluation (Schulmeyer, 2002). In the Peruvian case, for example, in 2017, approximately 238 thousand teachers carried out one of the largest teacher strikes, where they demanded the repeal of the Teacher Performance Evaluation (EDD in Spanish, Fowks, 2017). This international situation shows the importance of investigating the various aspects of this problem. In this framework, this research was carried out with the objective of exploring the beliefs and causal attributions that teachers of bilingual rural-multigrade Primary Level schools in the Ancash region handle on this evaluation. Beliefs and causal attributions were chosen as theoretical elements, because both are constructs that are complementary and that allow the study of perceptions about a phenomenon. Based on this, this qualitative study was carried out with a phenomenological approach and some tools of grounded theory were used. After defining this methodological estimation, five semi-structured interviews were carried out with teachers of this type of schools. After the analysis, it was evidenced that the participants assume that their experience in the classroom, their preparation and their initial training constitute causes of success or failure when facing the EDD. Likewise, a certain level of distrust was identified as to the purpose of the evaluation, since it was found that some teachers believe that this evaluation is likely to seek the dismissal of teachers. Finally, it was found that some teachers believe that some characteristics of their students from the schools in which they work and the time allocated to the evaluation would influence their performance when facing the EDD. / Trabajo de Suficiencia Profesional

La presente investigación pretende analizar el uso del método de evaluación de desempeño de ranking forzado, el cual intenta mejorar la objetividad y reducir los sesgos de los evaluadores. También, se han estudiado otros métodos de evaluación de desempeño utilizados en la actualidad. Para este fin, se han revisado artículos de diferentes autores que han investigado dichos métodos en el transcurso de los años. Sus estudios se basan en encuestas, investigaciones previas y organizaciones que implementan estos métodos de evaluación con sus trabajadores. El objetivo es analizar perspectivas en torno al método del ranking forzado, mientras se lleva a cabo una revisión bibliográfica de artículos académicos relevantes. Estos indican que, en las organizaciones con una cultura de meritocracia, la implementación del método de ranking forzado puede tener un impacto positivo; sin embargo, también podría presentar un impacto negativo en función de la percepción y aceptación de la metodología por parte de los trabajadores, lo cual se profundiza en la investigación. / This research intends to analyze the forced distribution rating systems method, which aims to improve objectivity and reduce evaluator biases. Other performance evaluation methods used nowadays have also been analyzed. Hence, it has been done a review of articles by different authors who have investigated these methods over the years. Their studies have been based on surveys, previous research and organizations that have implemented these evaluation methods with their employees. The goal is to analyze insights on the forced ranking method, carrying out a bibliographic review of relevant academic articles. These articles indicate that in organizations with a culture of meritocracy, the implementation of the forced distribution ranking systems can have a positive impact. However, depending on the perception and acceptance of the methodology by employees, it could also have a negative impact, which will be explained in this research. / Trabajo de Suficiencia Profesional

Software deployment is all of the activities that make a software system available for use. An examaple of such activites can be installations, updating and removing of software. Each deployment platform can differ in quality attributes such as performance, maintainability, etc. Docker, a deployment platform using container technology offering a more modular way of deployment has become increasingly popular over the past few years. The aim of the project is to find out how a deployment with Docker would affect the performance of a client­server application from the mining industry. Three scenarios were performed in a simulated environment for the existing as well as the potential deployment platform. Measures of round­trip time were made for both sets of the scenarios. Results show a general decrease in performance when running the application on Docker. This is especially seen in early stages of each scenario, where Docker in average has 15 times higher round­trip times than the existing platform. However, results gathered from each scenario suggests that while Docker does start much slower than the existing platform, in later stages of each scenarios, Docker manages to narrow the gap and be at most 1.14 times higher than the existing platform. In conclusion, while the deployment in which the existing platform is deployed on does out perform Docker, it still shows some promise and could potentially be a worthy option to look at for further work.

Over eight decades of research into total artificial hearts (TAHs) has significantly contributed  to saving end-stage heart failure patients. However, at the current stage of development TAHs have several limitations, one of them being their bulkiness. Hence this thesis, with the goal to evaluate the right pump of the TAH developed by Scandinavian Real Heart and propose a compact right drive system without consuming significantly more power than the initial system. In order to do this, the requirements for the right drive systems are evaluated and defined. These requirements are then used to develop a methodology, including a MatLab simulation, for examining and selecting motors for the drive unit of the TAH. Subsequently, the methodology and the simulation are used to identify and assess over 200 motors, as well as select 3 motors for real-world experimental analysis. The suggested motors and the initial motor are then tested in a mock circulatory loop to investigate the performance characteristics and power consumption of the motors. This is done to select the final motor for the right drive unit, as well as verify and validate the created simulation. Based on careful analysis of the mathematical models used in the simulation and presented experimental data, the simulation was accepted to be verified. However, the support for validation of the simulation was lacking, as conflicting outcome for some cases were observed between the simulation and experimental data. Furthermore, given the empirical evidence, a brushless dc motor for the right drive unit and its implementation was proposed. The proposed motor has 11% reduction in size, 20% reduction in power consumption and 34% reduction in weight compared to the initial motor. Therefore, a drive unit with the suggested motor can have a significant impact on the right pump, and potentially even the left pump. Furthermore, the utilisation of the developed simulation can ultimately result in efficient and cost-effective motor selection and provide valuable contribution to the field of drive system development for TAHs. / Över åtta decennier av forskning om totala artificiella hjärtan (TAH) har omfattande bidragit till att rädda patienters liv med kronisk hjärtsvikt. Dessvärre har TAH flera begränsningar i det nuvarande stadiet i utveckling där storleken är ett problem. Därav denna avhandling, med målet att utvärdera den högra pumpen av en TAH utvecklad av Scandinavian Real Heart, för att föreslå ett mer kompakt höger drivsystem utan att det ska förbruka väsentlig mängd mer energi än det ursprungliga systemet. För att åstadkomma detta, har de fysiologiska krav för den högra pumpen analyserats och utifrån den utförda analysen nya krav för drivsystemet har formulerats. Dessa krav har sedan lagt grunden till utveckling av en metodik, inklusive en MatLab-simulering, för att undersöka och välja motorer för drivsystemet av en TAH. Metodiken i samband med simuleringen har använts för att identifiera och bedöma över 200 motorer. Av dessa motorer har tre motorer valts för experimentell utvärdering. I den experimentella utvärderingen, prestandaegenskaper och effektförbrukning av samtliga valda motorer och den ursprungliga motorn har utvärderats i ett konstgjort cirkulationssystem. Syftet med den experimentella utvärderingen är att komma fram till en slutmotor, samt verifiera och validera den utvecklade simuleringen. Baserad på noggrann analys av de använda matematiska modeller i simuleringen och det presenterade experimentella data, ansågs simuleringen vara verifierad. Däremot saknades stöd för validering av simuleringen, på grund av en del motsägande utfall mellan simulering och experimentell data. Därutöver, utifrån den empiriska evidensen föreslogs en borstlös likströmsmotor och dess implementering för det högra drivsystemet. Den föreslagna motorn är 11% mindre i storlek, har 20% lägre effektförbrukning och väger 34% mindre än den ursprungliga motorn. Därför kan en drivenhet med den föreslagna motorn ha en betydande inverkan på den högra pumpen, och potentiellt även den vänstra. Dessutom kan den utvecklade simuleringen användas för att göra urval av motorer för TAH på ett produktivt samt kostnadseffektivt sätt och därmed bidra till framtida utvecklingar av drivenheter för TAH.

This report aims to look at how Russia’s war in Ukraine has affected the work with IT security at Swedish municipalities, what actions have been taken, if any, and see if there has been an increase in attacks towards the municipalities’ networks. This was done by sending out a questionnaire to all of Sweden’s 290 municipalities via email with four questions regarding their IT security. 103 of Sweden’s municipalities responded to the email. Ten municipalities declined to participate in the report, which means that 32% (93) of Sweden’s municipalities participated in this survey. We chose to evaluate the Swedish municipalities and their preparedness in case of war for several reasons. They are a uniform group which we believed adhere to the same guidelines and regulations regarding cybersecurity, and the fact that they store and engage with critical and sensitive data about Sweden and its population, making them prime targets for attacks by foreign powers. The results were presented anonymously and based on the voluntary responses of the municipalities. Answers were then compiled and sorted into the five main categories from the NIST framework for cybersecurity. The report concludes that Swedish municipalities have taken significant actions to protect their networks in response to Russia’s war and aggressions towards Ukraine. For example, 18 municipalities reported that they had trained their staff in some way, which was the most common measure, and 11 municipalities had implemented two-factor authentication. However, more can be done in terms of responding to threats and enhancing recovery plans and systems. In summary, there seemed to be a lack of consensus on how municipalities should handle their own IT-security, as there was a high variation in the responses. The follow-up questions revealed a significant increase in attacks towards the municipalities’ networks, with many considering their networks potential targets for future attacks from foreign powers.

[pt] Os fundos de previdência complementar fechados, também conhecidos como fundos de pensão, através da geração de poupança interna e na ampliação do investimento produtivo desempenham uma participação importante no desenvolvimento da economia. O presente trabalho teve como objetivo verificar o desempenho dos fundos de pensão, no período de 2010 a 2014. No total foram analisadas as rentabilidades anuais de 60 fundos, sendo que 30 de patrocinadores privados e 30 de patrocinadores públicos. Esta pesquisa procura analisar o desempenho destes fundos e verificar se estes possuem uma rentabilidade satisfatória, avaliar se existe diferença de gestão entre fundos com patrocinadores de empresas públicas e privadas e posteriormente para determinar os fatores de risco das carteiras dos fundos seria utilizado o modelo proposto por Sharpe, conhecido como analise de estilo baseado em retorno. A avaliação dos desempenhos dos fundos foi realizada por modelos quantitativos clássicos como índice Sharpe, índice de Modigliani e índice de Treynor. A pesquisa de fundos de previdência complementar fechada se justifica, pelos poucos estudos publicados, pelo crescimento continuo das discussões sobre análise de desempenho e estilo de gestão nestes fundos. / [en] Closed pension funds, also known as pension funds, through domestic savings generation and expansion of productive investment play an important role in developing the economy. This study aimed to verify the performance of pension funds in the period 2010 to 2014. In total the annual returns of 60 funds were analyzed, of which 30 private sponsors and 30 public sponsors. This research seeks to analyze the performance of these funds and to determine whether they have a satisfactory profitability, assess whether there are differences in management between funds with sponsors of public and private companies and subsequently to determine the risk factors of the portfolios of the funds would be used the model proposed by Sharpe, known as return-based style analysis. The evaluation of the performance of the funds was performed by classical quantitative models as Sharpe ratio, Modigliani index and Treynor index. The survey closed pension funds is justified by the few published studies, the continued growth of discussions on analysis of performance and style of management in these funds.

With increasing technological advancements more sophisticated mobile devices are being used by end-users. Third generation (3G) mobile communication systems such as Universal Mobile Telecommunication System (UMTS) are not able to satisfy the rising demand for higher throughputs and low latencies. New standards based on Orthogonal Frequency Division Multiplexing (OFDM), such as Long Term Evolution (LTE) and Worldwide Interoperability for Microwave Access (WiMAX), have been proposed and are currently being integrated into existing mobile networks all over the world. LTE specifications are being finalized within the 3rd Generation Partnership Project (3GPP) with the ambitious goals of increased spectral efficiency and end user throughput. Despite the introduction of several high data rate services, voice communication is still an essential part of the overall wireless wide area cellular communication market. In LTE, the core network is purely packet switched, thus voice is transmitted entirely using a Voice over Internet Protocol (VoIP). Like its predecessor standards it is desired that a large number of simultaneous VoIP calls be supported in LTE, while satisfying the desired Quality of Service (QoS) demands. This thesis examines issues related to VoIP capacity for LTE. One of the key challenges is the limited number of schedulable voice packets per sub frame. The main goal of this thesis is to quantify the impact of this limitation. After describing basic LTE concepts, a detailed description of the control channel resource limitations for the scheduling of voice packets is presented. Consequences of these limitations are explained systematically by presenting the problem in a wider context. Simulation results were obtained using the openWNS Simulator, an event driven system level simulation platform developed at the Communication Networks Research Group (ComNets), RWTH Aachen University Germany. Results are presented showing the impact of different scheduling strategies on VoIP capacity. These results illustrate how the limited control channel resources, specifically the Physical Downlink Control Channel (PDCCH) resources, affect the total number of schedulable VoIP user audio media streams. / Med ökande tekniska framsteg mer avancerade mobila enheter som används av slutanv ändarna. Tredje generationens (3G) mobila kommunikationssystem såsom Universal Mobile Telecommunication System (UMTS) inte kan tillgodose den ökande efterfrågan på högre genomströmning och låga latenser. Nya standarder som bygger på Orthogonal Frequency Division Multiplexing (OFDM), såsom Long Term Evolution (LTE) och Worldwide Interoperability för Microwave Access (WiMAX), har föreslagits och håller på att integreras I befintliga mobilnät över hela världen. LTE specifikationer håller på att färdigställas inom 3rd Generation Partnership Project (3GPP) med de ambitiösa målen om ökad spektral effektivitet och slutanvändare genomstr ömning. Trots införandet av flera tjänster av hög datahastighet, är röstkommunikation fortfarande en väsentlig del av den totala Wireless Wide Area cellulär kommunikation marknaden. I LTE är kärnnätet rent paketförmedlande därmed röst överförs helt och hållet med hjälp av en Voice over Internet Protocol (VoIP). Precis som sina föregångare standarder är det önskvärt att ett stort antal samtidiga VoIP samtal få stöd i LTE, samtidigt som det uppfyller önskade Quality of Service (QoS) krav. Denna avhandling undersöker frågor relaterade till VoIP kapacitet för LTE. En av de viktigaste utmaningarna är det begränsade antalet schemaläggningsbart röst paket per sub ram. Det huvudsakliga målet med denna avhandling är att kvantifiera effekterna av denna begränsning. Efter att ha beskrivit de grundläggande LTE begrepp, är en detaljerad beskrivning av de resurser kontroll kanal begränsningar för schemaläggning av röst paket presenteras. Konsekvenser av dessa begränsningar förklaras systematiskt genom att presentera problemet i ett större sammanhang. Simulering resultat erhölls med hjälp av openWNS Simulator, en händelse driven systemnivå simulering som utvecklats vid Communication Networks Research Group (ComNets), RWTH Aachen University Tyskland. Resultat presenteras som visar effekterna av olika schemaläggning strategier för VoIP kapacitet. Dessa resultat illustrerar hur de begränsade kontroll kanalresurser, särskilt fysiskt Downlink (PDCCH) resurser, påverkar det totala antalet schemaläggningsbart VoIP användare ljud mediaströmmar.