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 “"Medium access control (MAC) protocol"”.
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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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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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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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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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Inter-LAN services over broadband satellite systems
… the satellite resources. We considered Internet Protocol (IP) based LANs using IPv6 and Resource Reservation Protocol (RSVP) to support both real-time and non-real time traffic. We propose a Medium Access Control (MAC) protocol for broadband satellite Inter-LAN services with a special emphasis on …
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Magneto inductive communication system for underwater wireless sensor networks
… production. A novel and an energy efficient medium access control (MAC) protocol based on the carrier sense medium access (CSMA) has also been implemented for the designed sensor node to improve throughput in a dense network"--Abstract, page iv.
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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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Efficient Communication Protocols for Underwater Acoustic Sensor Networks
… and develop efficient sensor communication protocols tailored for the underwater environment. Specifically, different deployment strategies for UW-ASNs are studied, and statistical deployment analysis for different architectures is provided. Moreover, a model characterizing the underwater …
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An improved medium access control protocol for real-time applications in WLANs and its firmware development
… as Wi-Fi, has emerged as a popular internet access technology and researchers are continuously working on improvement of the quality of service (QoS) in WLAN by proposing new and efficient schemes. Voice and video over Internet Protocol (VVoIP) applications are becoming very popular in Wi-Fi …
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Performance Analysis of Network Coding Techniques and Resource Allocation Algorithms in Multiuser Wireless Systems
… channel adaptation are necessary. Both an ideal medium access control (MAC) protocol and a non-ideal MAC protocol (dedicated control channel) are considered.
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Wireless ATM Networks Medium Access Control with Adaptive Parallel Multiple Substream CDMA Air-inteface
… components of any wireless network is the medium access control protocol. This research deals with wireless ATM (WATM) medium access control (MAC) protocol. Conventional studies concerning WATM have focused mainly on variations of the time-division-multiple-access (TDMA) method for the …
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Performance Modelling of Multi-Hop LoRa-based Networks for IoT Applications
… work. First, the Wake-on-Radio (WOR) LoRaWAN protocol, a relay-based multi-hop LoRaWAN scheme proposed by the LoRa Alliance, and second, a novel up-link focused multi-hop LoRa-based network introduced in this study, called LoRaMesh, which employs a slotted ALOHA medium access control (MAC) …
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Energy saving and reliability of wireless body area networks for health applications
… of biomedical data at sink nodes based on medium access control (MAC) protocol IEEE 802.15.4 standard. A novel mathematical model for WBSN topology is proposed in this thesis to explain the deployment of and connection between biosensor nodes, simple relay nodes, network coding relay nodes, …
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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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Implanted Antennas and Intra-Body Propagation Channel for Wireless Body Area Network
… modeling, antenna design, physical layer (PHY) protocol design, medium access control (MAC) protocol design and power source. This research focuses on the design of implanted antennas, channel modeling between implanted devices and Wireless Power Transfer (WPT) for implanted devices. An …
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Energy-Efficient Medium Access Control Protocols and Network Coding in Green Wireless Networks
… These approaches are based on a stack of protocol layers aiming to maximize performance-related metrics, such as throughput or Quality of Service (QoS), while paying less attention to energy efficiency. Although the focus has shifted to energy efficiency recently, most of the existing …
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Medium access control design for all-IP and ad hoc wireless network
Medium Access Control (MAC) protocol in a wireless network controls the access of wireless medium by mobile terminals, in order to achieve its fair and efficient sharing. It plays an important role in resource management and QoS support for applications. All-IP wireless WAN is fully IP …
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