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 88 for “"MAC protocol"”.
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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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MAC protocol design considerations for efficient mobility in wireless sensor networks
… computational algorithms and communication protocols for WSNs focus more on energy conservation rather than throughput and delay as in other wireless networks. Recently, WSN research has grown from static to mobile sensor networks (MSNs). However, there are some weaknesses in the standard …
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Fuzzy-token: An adaptive Mac protocol for wireless network-on-chip
… adaptivity. We propose Fuzzy-Token, a simple protocol that leverages the unique properties of the on-chip scenario to deliver efficient and low-latency access irrespective of the application characteristics. We substantiate our claim via simulations with a synthetic traffic suite and real …
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Design and Implementation of a MAC protocol for Wireless Distributed Computing
… 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 presented here elaborates …
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Performance of voice and data transmission using the IEEE 802.11 MAC Protocol
… sources, the 802.11 Medium Access Control (MAC) sublayer uses a type of Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) protocol called the Distributed Coordination Function (DCF). The MAC protocol also includes an optional polling scheme called the Point Coordination …
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Medium access delay evaluation for distributed queueing dual bus (DQDB) MAC protocol
… 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 unfairness in …
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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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Design of a MAC protocol for wavelength sharing in a passive optical distribution network
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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An Energy Aware and Secure MAC Protocol for Tackling Denial of Sleep Attacks in Wireless Sensor Networks
… and simulating three Media Access Control ( protocols Sensor MAC, Timeout MAC andTunableMAC under different network sizes and measuring different parameters such as the Received Signal Strength RSSI) and Link Quality Indicator ( Transmit power, throughput and energy efficiency Duty cycling …
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An analytical model of MAC protocol dependant power consumption in multi-hop ad hoc wireless sensor networks
… power. This thesis shows how DPM states and protocol operational states can be combined into a single stochastic model to finely 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 …
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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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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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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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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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Mobile Wireless System Interworking with 3G and Packet Aggregation for Wireless LAN
… was developed to study the performance of our protocol, AGG-MAC (aggregated medium access control). AGG-MAC is a simple and elegant medium access control (MAC) protocol designed to improve performance by transmitting a maximal quantity of data with minimal overhead. Our enhancement to IEEE …
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TDMA Slot Reservation in Cluster-Based VANETs
… The goal of this dissertation is to design a MAC protocol in order to provide the ability of the transmission of non-safety message with little impact on the reliability of transmitting safety message even if the traffic and communication densities are high.</p> <p>VANET is a highly dynamic …
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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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Simulation modelling of QoS enhancements in IEEE, 802. 11 networks and the effects of channel modelling
… of the channel effects in 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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A Proactive Routing Protocol for Multi-Channel Wireless Ad-hoc Networks
… has made the IEEE 802.11 medium access control (MAC) protocol the de facto MAC protocol for wireless mobile ad-hoc net-works, even though it is not optimal. The IEEE 802.11 MAC protocol is designed to have stations share a single channel in a given network. However, many of the IEEE 802.11 …
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Fixed chain-based wireless sensor network for intelligent transportation systems
… 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 protocol compatible with …
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