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 19 of 19 for “"Media Access Control (MAC)"”.
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Enhancing the energy efficiency of ultra wideband (UWB) based media access control (MAC) protocols in mobile ad-hoc networks (MANETs) through the use of steerable directional antenna
… area, research on the way directional antennas access the wireless medium specific to Ultra-WideBand (UWB) systems have not gained wide attention. The aim of this research is to design, implement and test an improved Medium Access Control (MAC) protocol for UWB systems in order to minimise …
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Characterizing Dynamic Power and Data Rate Policies for WirelessUSB Networks
… on battery life. Power can be conserved at the Media Access Control (MAC) layer by intelligently adjusting transmission power level and data rate encoding. WirelessUSB is a low-power, low-latency wireless technology developed by Cypress Semiconductor Corporation for human interface devices such …
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A quality of service architecture for WLAN-wired networks to enhance multimedia support
The use of WLAN for the provision of IP multimedia services faces a number of challenges which include quality of service (QoS). Because WLAN users access multimedia services usually over a wired backbone, attention must be paid to QoS over the integrated WLAN-wired network. This research focuses …
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Medium access delay evaluation for distributed queueing dual bus (DQDB) MAC protocol
Distributed Queuing Dual Bus (DQDB) is a media access control (MAC) technique, which is being considered by the IEEE 802.6 for the metropolitan area network (MAN). The DQDB medium access technique has many promising advantages over other access methods. However it has one drawback, which is its …
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An Application of Bluetooth Technology to Rural Freeway Speed Data Collection
… a Bluetooth device capable of recording the media access control (MAC) addresses of target radios on Interstate 71 and calculating the resulting space mean speed. Based on the development of these Bluetooth devices, recommendations including node spacing configurations are developed for urban …
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Underwater acoustic communications and adaptive signal processing
… computer simulations on both Physical (PHY) and Media access control (MAC) layers. The ocean experimental results show that without channel equalization, the full tail-biting convolution (FTBC) codes with short packet lengths not only can perform similarly to zero-tailing convolution (ZTC) codes …
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Privacy and Security in IPv6 Addressing
… an address using a static value derived from the Media Access Control (MAC) address of a network interface as host portion, or interface identifier (IID). The Dynamic Host Configuration Protocol version 6 (DHCPv6) uses a client-server model to manage network addresses, providing stateful address …
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Bluetooth Low Energy Based CoAP Communication in IoT CoAPNonIP: An Architecture Grants CoAP in Wireless Personal Area Network
… Bluetooth Low Energy (BLE) devices use the Media Access Control (MAC) address as an identifier and use Generic Attribute Profile (GATT) to transfer data. Therefore, how to overcome those barriers is an important topic. There are several approaches to overcome those barriers. For example, a …
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Protocol stacks for power-aware wireless microsensor networks
… power aware features in the link layer and media access control (MAC) layer promises to extend the lifetime of the sensor network. The power-aware design will be illustrated on [mu]AMPS sensor node prototypes. With the integrated design framework, lower layers of the network stack provides …
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Throughput Performance of Wireless Networks
… with scheduling of bandwidth resources in the Media Access Control (MAC) layer. This investigation is performed for both outdoor and indoor environments and considers two types of scheduling scheme, namely Maximum Rate (MR) and Equal Allocation (EA) Scheduling. A cross-layer trac model is used …
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An admission control scheme for IEEE 802.11e wireless local area networks
… (NGNs), WLANs can be seen as an important access network technology to support IP multimedia services. However a traditional WLAN does not provide Quality of Service (QoS) support since it was originally designed for best effort operation. The IEEE 802. 11e standard was introduced to …
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Exploiting wireless broadcast property to improve performance of distributed algorithms and mac protocols in wireless networks
… more efficient distributed algorithms as well as MAC protocols for wireless networks. We exploit the wireless broadcast property in three different aspects. First, we design mutual exclusion algorithms for wireless networks in which opportunistic packet overhearing is exploited to decrease the …
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Fixed chain-based wireless sensor network for intelligent transportation systems
… to radio propagation, energy constraints and the Media Access Control (MAC) protocol. This thesis develops a ground level radio propagation model for communication between road studs, and energy efficiency metrics to manage the resources to overcome the energy constraints, as well as a MAC …
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Multi-Dimensional QoS and Collaborative MAC Layer Design for Dense, Diverse, and Dynamic IoT Network
… of Internet of Thing (IoT) devices, Access Points (APs) of future Wireless Fidelity (Wi-Fi) networks are expected to support dense Stations (STAs) with diverse Quality-of-Service (QoS) requirements under dynamic channel conditions. On account of high access collision and optimization …
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Spectrum-efficient Cooperation and Bargaining-based Resource Allocation for Secondary Users in Cognitive Radio Networks
Dynamic spectrum access (DSA) is a promising approach to alleviate spectrum scarcity and improve spectrum utilization. Our work aims to enhance the utilization of the available white spaces in the licensed spectrum by enabling cooperative communication in the secondary networks. We investigate the …
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Distributed Scheduling and Delay-Throughput Optimization in Wireless Networks under the Physical Interference Model
… interference models affect scheduling and power control -- essential building blocks in the operation of wireless networks -- that directly deal with the wireless medium; the physical interference model (compared to graph-based interference model) compounds the problem of efficient scheduling and …
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Adaptive Asymmetric Slot Allocation for Heterogeneous Traffic in WCDMA/TDD Systems
… generation wireless systems aim to achieve multimedia services at high speed, it is rather difficult to have full-fledged multimedia services due to insufficient capacity of the systems. There are many technical challenges placed on us in order to realize the real multimedia services. One of …
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On backoff mechanisms for wireless Mobile Ad Hoc Networks
… cannot be used for synchronization. The shared media used by wireless networks, grant exclusive rights for a node to transmit a packet. Access to this media is controlled by the Media Access Control (MAC) protocol. The Backoff mechanism is a basic part of a MAC protocol. Since only one …
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Design of a medium access control protocol that exploits the structures of vehicular networks
… and show how they can be exploited to design a MAC layer that provides better performance than a MAC layer designed without taking such structures into account. Particular important examples of the structures in VANETs are: (i) Periodic broadcast is the common transmission pattern due to the …