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.
Results
Showing 1 to 20 of 91 for “"Medium Access Control (MAC)"”.
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Simulation modelling of QoS enhancements in IEEE, 802. 11 networks and the effects of channel modelling
… EDCA and DCF protocols of the IEEE 802.11 Medium Access Control (MAC) protocol on overall network performance is investigated.
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Design and Evaluation of Multi-Channel Multi-Hop Wireless Networks
… protocols. Based on the observations, we develop medium access control (MAC) and routing protocols that can utilize multiple channels with a single interface. Finally, we evaluate the multi-channel protocols through simulation and a prototype implementation.
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Distributed power control (DPC) based energy efficient protocols for wireless networks
… is to develop energy efficient schemes and medium access control (MAC) protocols for wireless networks in the presence of fading channels while satisfying network constraints and user defined QoS requirements"--Abstract, page iv.
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Medium Access Control in Impulse-Based Ultra Wideband Ad Hoc and Sensor Networks
This thesis investigates distributed medium access control (MAC) protocols custom tailored to both impulse-based ultra wideband (I-UWB) radios and to large ad hoc and sensor networks. I-UWB is an attractive radio technology for large ad hoc and sensor networks due to its robustness to multipath …
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Efficient distributed medium access algorithm
… among various entities contending for their access is one of the fundamental problem in engineering and operations research. To design a large, scalable networked systems, scheduling algorithms are required to be computationally very simple and distributed (or message passing). In this …
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Multi-layer traffic engineering framework for inter-working multi-hop wireless networks
… ubiquitous seamless service and continual access for network users. Ubiquity can be achieved through multi-technology mobile terminals (nodes), which enables network users to access any available network. In addition, such nodes extend network coverage by relaying traffic for each other. …
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Connection admission control and packet scheduling for IEEE 802.16 networks
… Area Networks (WMAN) for Broadband Wireless Access (BWA) which is known as Worldwide Interoperability for Microwave Access (WiMAX), provides a solution of broadband connectivity to areas where wired infrastructure is economically and technically infeasible. Apart from the advantage of having …
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An energy-efficient communication system for ad hoc wireless and sensor networks
… is composed of a duty cycling and pseudo-random Medium Access Control (MAC) that provides deterministic access to the shared medium. Furthermore, the MAC provides link level QOS to support high data rates required for real-time traffic as well as delay-bounded services such as voice and …
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A flexible medium access control framework for multimedia application support in wireless ATM
… it is logical that users will want to have access to these same multimedia streams [rom a mobile terminal. Wireless solutions for connectivity to networks such as Ethernet networks already exist, however, a method of supporting access to an ATM network from a mobile terminal has not yet been …
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An analytical model of MAC protocol dependant power consumption in multi-hop ad hoc wireless sensor networks
… evaluate the power consumption performance of a medium access control (MAC) protocol. The model is formulated as a semi-Markov decision process (SMDP) wherein the node's states, sojourn times, and transition probabilities are controlled by a virtual node controller. The overall operation of a …
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An Energy-Efficient Medium Access Control Protocol for Wireless Sensor Networks "V-MAC"
… efficient. In this thesis, we focus on the Medium Access Control (MAC) layer in WSNs. We propose a MAC scheme, V-MAC, for WSNs that extends that lifetime of the network. We compare V-MAC with other MAC schemes. V-MAC uses a special mechanism to divide sensors in different groups and then all …
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Cooperative communications in wireless networks : novel approaches in the mac layer
… for the cooperative communication problem in the medium access control (MAC) layer are proposed. The novelty of this thesis is two-fold. We first investigate the problem of cooperative communication in a special type of wireless networks, namely ultra wide-band (UWB) networks, for the first time …
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Movable frame hybrid MAC : a multi-MAC protocol for wireless software radios in multi-rate multimedia applications
We describe a new medium-access control (MAC) protocol for dynamic adjustment of the bandwidth requirement of multimedia applications. The purpose of this technique is handling multi-rate, multi-level traffic in an integrated wireless-access network (IWAN). A proposed mechanism divide total …
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Performance study on a dual prohibition Multiple Access protocol in mobile Ad Hoc and Wireless Mesh networks
… networks need a mechanism to regulate the access on the transmission medium. Medium Access Control (MAC) protocols control access to the shared communication medium so that it can be used efficiently. In this thesis, we first describe the collision-controlled Dual Prohibition Multiple …
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Design and Implementation of a MAC protocol for Wireless Distributed Computing
… peers, it is imperative and necessary to have a medium access control (MAC) protocol for such networks which is capable of scheduling channel access by multiple radios in the network, ensuring reliable data transfer, incorporating rate adaptation as well as handling link failures. The thesis …
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Utilizing Beamforming Antennas for Wireless Multihop Networks
… Based on the insights, we have designed medium access control (MAC) and routing protocols to suitably exploit the benefits of beamforming. We have demonstrated part of our solutions on a small prototype testbed, equipped with electronically steerable antennas.
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Techniques for mitigating congestion in wireless sensor networks
… a larger number of radio hops. Congestion control in wired networks is usually done using end-to-end and network-layer mechanisms acting in concert. However, this approach does not solve the problem in wireless networks because concurrent radio transmissions on different "links" interact …
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Improving aggregate user utilities and providing fairness in multi-rate wireless LANs
A distributed medium access control (MAC) protocol is responsible for allocating the shared spectrum efficiently and fairly among competing devices using a wireless local area network. Unfortunately, existing MAC protocols, including 802.11's DCF, achieve neither efficiency nor fairness under many …
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Security threats to the MAC-layer in wireless networks
Medium access control (MAC) protocol security is important in wireless networks due to the lack of physical access control that normally exists in wired networks in the form of connecting a cable. Most efforts in standards organizations and academic research focus on the requirements of …
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Cross-layer design of random access wireless networks
… challenges for wireless networks. Wireless medium access control (MAC) has to be specifically designed to resolve contention in the presence of interference. As a result, an important technique, the random access protocol, has emerged to address the contention issue. This protocol is the …
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