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 66 for “"Link Layer"”.
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Enhanced link layer handover based on localization
… handoffs. The mobile node has to complete a link layer handoffs together with other tasks associated with handoffs in order to effectively have a new wireless link with the new AP. The link layer handoffs currently specified and practiced in IEEE 802.11 is normally carried out in three time …
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Physical layer-aware wireless link layer protocols
… networks is of great importance today. Wireless links are characterized by a rapidly varying channel, requiring transmitters to dynamically adapt their transmit bit rate. The broadcast nature of radio also necessitates the use of medium access protocols to arbitrate access among competing …
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Data-Link Layer Traceback in Ethernet Networks
… has been conducted on the problem of Data-Link Layer Traceback (DLT), the process of tracing frames from the network edge to the attack source, across what is usually a layer-2 network. We propose a scheme called Tagged-fRAme tracebaCK (TRACK) that provides a secure, reliable DLT technique …
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Channel-predictive link layer ARQ protocols in wireless networks
… node-to-node data transfer is performed by link layer protocols. One prominent approach is Automatic Repeat Request (ARQ) protocol. The traditional ARQ protocols attempt to recover the erroneously transmitted frames by retransmitting those frames, regardless of the channel state. Since this …
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Link layer protocol performance of indoor infrared wireless communications
… for indoor wireless connectivity but infrared link quality is affected by ambient infrared noise and by low power transmission levels due to eye safety limitations. The Infrared Data Association (IrDA) has developed the widely used IrDA 1.x protocol standard for short range, narrow beam, point …
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Distributed medium access control for an enhanced physical-link layer interface
Current wireless network architecture equips data link layer with binary transmission/idling options and gives the control of choosing other communication parameters to the physical layer. Such a network architecture is inefficient in distributed wireless networks where user coordination can be …
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Interactions between TCP and link layer protocols on mobile satellite links
… frequent correlated packet loss. The use of a link layer ARQ protocol can improve TCP performance by insulating TCP from data. loss. However, the interactions between TCP and link layer protocols are not well understood. This thesis describes an emulation-based study of a mobile satellite link …
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RFIDIoT: RFID as the data link layer for the internet of things
In this thesis, the suitability of RFID as a platform for real time applications in the Internet of Things is investigated. Two sample applications of RFID technology identify throughput and latency as key figures of merit. An experiment to measure these parameters in an existing implementation is …
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A CNN–LSTM–Attention Hybrid Architecture for Real-Time Intrusion Detection at the Data Link Layer
Data Link Layer (Layer 2) security remains one of the most underexplored areas in modern network intrusion detection research, despite its critical role as the foundation of reliable communication between networked devices. Attacks at this layer, such as ARP spoofing, MAC flooding, VLAN hopping, …
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Adaptive Protocols to Improve TCP/IP Performance in an LMDS Network using a Broadband Channel Sounder
… configuration changes in an adaptive data link layer protocol. We present an adaptive data link layer protocol that can use different levels of forward error correction (FEC) codes and link layer automatic retransmission request (ARQ) to improve network and transport layer performance. …
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Statistical delay QoS driven resource allocation and performance analysis for wireless communication networks
… of delayconstrained resource allocation and link-layer throughput analysis. Firstly, a joint optimization problem of link-layer energy efficiency (EE) and EC in a single-user single-carrier communication system, is proposed and investigated, under a delay violation probability requirement and …
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A cooperative communication protocol for wireless ad-hoc networks
… by utilizing cooperation in the network layer, where all nodes act as routers to relay messages. Cooperative transmission takes this idea a step further, moving cooperation to the link layer, where nodes actually broadcast signals simultaneously to increase signal strength. Using network …
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A Transport Layer Approach to Host Mobility
… mobility is traditionally implemented in the link or network layer. In comparison, the transport layer has access to end-to-end information not available at lower layers. Coupled with inverse multiplexing techniques and error classification algorithms, such information can be used to achieve a …
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Wireless personal area networks and free-space optical links
This thesis is concerned with the link layer design of indoor (IrDA) and outdoor infrared links, as well as the performance of the higher layers of two major Wireless Personal Area Network (WPAN) technologies: IrDA and Bluetooth. Recent advancesin wireless technology have made it possible to put …
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Reliable Ethernet
… RTT. Other approaches utilize specialized data link layer networks such as InfiniBand and Fibre Channel to provide network reliability.</p> <p>The algorithm proposed in this thesis builds on the ubiquitous Ethernet protocol to provide reliability at the data link layer without the overhead and …
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A QoS enabling queuing scheme for Fourth Generation wireless access networks
… a network of queuing nodes. With the model, the link layer QoS statistics of user traffic in each available path through the network is determined. The author postulates that the statistics indicate the QoS capabilities of the network and can therefore be used to select the best network to serve …
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The SoftPHY abstraction : from packets to symbols in wireless network design
… We observe that this is the result of higher layers working at the packet granularity, whereas they would benefit from a shift in perspective from whole packets to individual symbols. From real-world experiments on a 31-node testbed of Zigbee and software-defined radios, we find that often, …
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Implementing XTP in an IP environment
… that can operate over several network and data link layer protocols. This paper examines the issues involved in implementing XTP version 4.0 over the IP network protocol. We investigate transport related issues that are unique to XTP, examine the behavior and performance of XTP/IP in a Linux …
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Prediction assisted fast handovers for seamless IP mobility
… in the literature have recently adopted a cross-layer approach to enhance movement detection functionality and make terminal mobility more seamless. Such fast handover protocols are dependent on an anticipated link-layer trigger or pre-trigger to perform pre-handover service establishment …
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