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 48 for “"MAC Protocols"”.
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Performance analysis of relay based cooperative MAC protocols
… The focus of this research is on the relay based MAC layer: design of cooperative MAC protocols, performance modelling, and protocol enhancements. The first contribution of this thesis is dedicated to the modelling of energy consumption which aids MAC protocol developers in the design phase to …
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Improving the scalability of MAC protocols in wireless mesh network
… is critical for the success of multi-channel MACprotocols. Unfortunately, current multi-channel MAC protocols are not efficient in the utilization of the multiple channels. The poor utilization of the available channels is also affected by the following: channel coordination, channel …
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Cluster based jamming and countermeasures for wireless sensor network MAC protocols
… energy. The medium access control layer (MAC layer) directly guides the radio hardware and manages access to the radio spectrum in controlled way. A top priority for a WSN MAC protocol is to conserve energy, however tailoring the algorithm for this purpose can create or expose a number of …
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Denial-of-Sleep Vulnerabilities and Defenses in Wireless Sensor Network MAC Protocols
… sensor network medium access control (MAC) protocols that leave them susceptible to denial-of-sleep attack. It then classifies these attacks in terms of an attacker's knowledge of the MAC layer protocol and ability to bypass authentication and encryption protocols. Attacks from each …
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Design of MAC protocols to support quality of service for multimedia traffic in wireless LANs
Since the introduction of 802.11 MAC protocol standards for wireless local area network (WLAN) in 1999 by the IEEE task force group, WLAN has experienced tremendous growth. This can be observed by the increasing number of “hotspots” in public places such as airports, train stations, shopping …
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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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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
… and test an improved Medium Access Control (MAC) protocol for UWB systems in order to minimise energy consumption in MANET’s through the application of directional antenna. Building on initial testing in the QualNet Simulator; a new MAC protocol design was modelled on the IEEE 802.15.3 …
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Medium Access Control in Impulse-Based Ultra Wideband Ad Hoc and Sensor Networks
… 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 fading …
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Distributed MAC protocol for networks with multipacket reception capability and spatially distributed nodes
… the potential to improve the performance of the MAC layer. However, we show that in networks with spatially distributed nodes, reusing MAC protocols originally designed for narrow-band systems (e.g., CSMA/CA) is inefficient. It is well known that when networks with spatially distributed nodes …
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Energy harvesting-aware design of wireless networks
… analysis and design of medium access control (MAC) protocols for WSNs operated by EH-capable devices. In particular, the dissertation first considers random access MAC protocols for single-hop EH networks, in which a fusion center collects data from a set of nodes distributed in its …
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Energy-efficient Wireless Sensor Network MAC Protocol
… energy-efficient medium access control (MAC) protocols designed to extend both the lifetime and range of wireless sensor networks. These networks are deployed in remote locations with limited processor capabilities, memory capacities, and battery supplies. The purpose of this research is …
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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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Distributed power control (DPC) based energy efficient protocols for wireless networks
… 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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QoS Management in Packet Cellular Networks
… by the class of multiple access wireless MAC protocols in shared-channel wireless networks in general, and ad hoc networks in particular. We propose our general mechanism for translating a given fairness model into a corresponding backoff-based collision resolution algorithm that …
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Energy-Efficient Medium Access Control Protocols and Network Coding in Green Wireless Networks
… for energy saving at the Medium Access Control (MAC) protocol layer and the combination of these with the integration of the Network Coding (NC) paradigm into the wireless network protocol stack for further energy savings. The main contributions of the thesis are divided into two main parts. The …
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MAC AND APPLICATION LAYER PROTOCOLS FOR HIGH PERFORMANCE NETWORKING
… of the given applications. Furthermore, these protocols need to be impervious to denial of service (DoS) and distributed DoS (DDoS) attacks. Some of the key performance aspects of HPN are low point-to-point and end-to-end latency, high reliability of transmitted frames and performance …
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Using routing information to improve MAC performance in multi-hop wireless networks
… However, traditional contention-based wireless MAC protocols such as IEEE 802.11 DCF are designed for single-hop wireless networks and do not perform well in multi-hop scenarios due to inefficiency in their medium reservation mechanisms. In this thesis, a new general mechanism, utilizing a new …
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Mitigating interference coexistence issues in wireless sensor networks
… reliability. To minimise energy consumption, WSN MAC protocols employ Clear Channel Assessment (CCA), to transmit and receive packets. For transmitting, CCA is used beforehand to determine if the channel is clear. For receiving, CCA is used to decide if the radio should wake up to receive an …
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