Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"QoS constraints"”.
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Wireless Throughput and Energy Efficiency under QoS Constraints
… traffic requires certain quality-of-service (QoS) guarantees.</p> <p>With these motivations, in the first part of the thesis, throughput and energy efficiency in fading channels are studied in the presence of randomly arriving data and statistical queueing constraints. In particular, Markovian …
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Delay QoS Provisioning and Optimal Resource Allocation for Wireless Networks
… systems require certain quality of service (QoS) constraints e.g., in terms of delay, buffer overflow or packet drop/loss probabilities, so that acceptable performance levels can be guaranteed for the end-users, especially in delay sensitive scenarios, such as live video transmission, …
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Resource allocation and physical layer security in wireless communication systems
… are investigated in the sense that certain QoS constraints are considered. Typically, this kind of problems fall within the NP class because of the integer nature of the involved user selection procedure. Hence, several near-optimal and heuristic solutions are proposed. In the second part of …
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Wireless Information and Power Transfer in Communication Networks: Performance Analysis and Optimal Resource Allocation
… impact of statistical quality of service (QoS) constraints on the overall performance is studied, and power control algorithms are provided.</p> <p> Next, power allocation strategies that maximize the system energy efficiency subject to peak power constraints are determined for fading …
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Power Control and Resource Allocation for QoS-Constrained Wireless Networks
… MIMO system where their quality of service (QoS) may be improved via cooperation. Most cooperative communication solutions are based on fixed spectrum access schemes and thus cannot further improve spectrum efficiency. In order to support more users in the existing spectrum, we consider …
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Session Management for Accountability in Distributed Multimedia Services
… systems that must satisfy quality-of-service (QoS) constraints, security is also a major requirement given the increasing criticality of such applications. For example, businesses might depend on Internet telephony to reach customers while governments might depend on video streaming to …
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A Class of Call Admission Control Algorithms for Resource Management and Reward Optimization for Servicing Multiple QoS Classes in Wireless Networks and Its Applications
… networks with the goal not only to satisfy QoS constraints, but also to maximize a value or reward objective function specified by the system. We demonstrate through analytical modeling and simulation validation that the CAC algorithms developed in this research for resource management can …
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Providing resilient quality of service connections in provider-based virtual private networks
… virtual links as resilient quality of service (QoS) connections and virtual sites. Virtual sites allow customers to implement functionality like customized routing and content adaptation in the cloud , as opposed to the current network model where all functionality is implemented at the network …
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QoS constrained cellular ad hoc augmented networks
… design criteria, three novel quality of service (QoS) constrained cellular ad hoc augmented network (CAHAN) architectures are proposed for next generation wireless networks. The CAHAN architectures have a hybrid architecture, in which each MT of CDMA cellular networks has ad hoc communication …
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RF-EMF Radiation Exposure and Radio Resources Management in 5G Wireless Network
… to support the users' target quality of service (QoS) requirements. To bring solution to the limited resources, heavy traffic demands and congestion problems; an efficient management of resources such as; the transmit power, time, physical resource blocks (PRBs), frequency (sub-channels) is …
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Wireless Networks for Communication and Sensing
… scheduling algorithms on quality of service (QoS) and fairness. In particular, for cellular downlink networks, we show that QLB policies outperform greedy policies in the presence of QoS constraints, and when used in conjunction with congestion control, we also show that QLB algorithms lead to …
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Qos In Cognitive Packet Networks: Adaptive Routing, Flow And Congestion Control
… that have different Quality of Service (QoS) requirements, the capability of a network to support QoS becomes more and more important and necessary. This dissertation explores QoS in Cognitive Packet Networks (CPN) by using adaptive routing, flow and congestion control. We present a …
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Cognitive Radio Systems: Performance Analysis and Optimal Resource Allocation
… subject to transmit and interference power constraints are studied. Simpler approximations of optimal power control policies in the low-power regime are determined. Low-complexity optimal power control algorithms are proposed.</p> <p>Next, energy efficiency is considered as the performance …
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Optimal resource allocation In base stations for mobile wireless communications
… and power to subcarriers, subject to various constraints including certain quality of service (QoS) constraints called rate constraints. These problems can be modelled as Mixed Integer Non-linear Programmes (MINLP). When we began the dissertation, we had the following main aims: To design an …
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Power efficient designs for 5G wireless networks
… the total transmission power subject to sum-rate constraints. We propose an optimal semi-closed form solution to this problem and we show that at the optimum, the end-to-end channel has only one non-zero tap. To extend the first work to high data-rate scenarios, we consider a second relaying-based …
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Efficient design of reconfigurable intelligent surface assisted multi-group multicast beamforming
… power subject to the quality-of-service (QoS) constraints and maximize the minimum quality-of-service among all users mainting a power budget constraint which is also known as max-min fair (MMF) problem. By exploring the interaction of the BS and RIS beamforming in the QoS problem, we …
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End-to-end security in service-oriented architecture
… selected services while meeting the predefined QoS constraints. Finally, we have extensively studied the correctness and performance of the proposed security measures based on a realistic SOA case study. All experimental studies validated the practicality and effectiveness of the presented …
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Performance modelling and analysis of congestion control mechanisms for communication networks with quality of service constraints. An investigation into new methods of controlling congestion and mean delay in communication networks with both short range dependent and long range dependent traffic.
… are used for ensuring the Quality of Service (QoS) in telecommunication networks. However, they are sensitive to parameter settings and have weaknesses in detecting and controlling congestion under dynamically changing network situations. Another drawback for the AQM algorithms is that they …
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Novel localised quality of service routing algorithms. Performance evaluation of some new localised quality of service routing algorithms based on bandwidth and delay as the metrics for candidate path selection.
… scale networks by efficient Quality of Service (QoS) routing, which considerably contributes to the QoS architecture. The biggest contemporary drawback in the maintenance and distribution of the global state is the increase in communication overheads. Unbalancing in the network, due to the …
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Resource Optimization Strategies and Optimal Architectural Design for Ultra-Reliable Low-Latency Applications in Multi-Access Edge Computing
… applications with different quality-of-service (QoS) requirements, this evolution focuses on ultra-dense edge networks with multi-access edge computing (MEC) facilities. MEC emerges as a solution, placing resourceful servers closer to users. However, the dynamic nature of processing and …
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