484 research outputs found
Ethernet - a survey on its fields of application
During the last decades, Ethernet progressively became the most widely used local area networking (LAN) technology. Apart from LAN installations, Ethernet became also attractive for many other fields of application, ranging from industry to avionics, telecommunication, and multimedia. The expanded application of this technology is mainly due to its significant assets like reduced cost, backward-compatibility, flexibility, and expandability. However, this new trend raises some problems concerning the services of the protocol and the requirements for each application. Therefore, specific adaptations prove essential to integrate this communication technology in each field of application. Our primary objective is to show how Ethernet has been enhanced to comply with the specific requirements of several application fields, particularly in transport, embedded and multimedia contexts. The paper first describes the common Ethernet LAN technology and highlights its main features. It reviews the most important specific Ethernet versions with respect to each application fieldâs requirements. Finally, we compare these different fields of application and we particularly focus on the fundamental concepts and the quality of service capabilities of each proposal
Recommended from our members
Integration of unidirectional technologies into wireless back-haul architecture
This thesis was submitted for the degree of Docter of Philosophy and awarded by Brunel University.Back-haul infrastructures of today's wireless operators must support the triple-play services demanded by the market or regulatory bodies. To cope with increasing capacity demand, the EU FP7 project CARMEN has developed a cost-effective heterogeneous
multi-radio wireless back-haul architecture, which may also leverage the native multicast
capabilities of broadcast technologies such as DVB-T to off-load high-bandwidth broadcast
content delivery. However, the integration of such unidirectional technologies into a packet-switched architecture requires careful considerations. The contribution of this thesis is the investigation, design and evaluation of protocols and mechanisms facilitating the integration of such unidirectional technologies into the wireless
back-haul architecture so that they can be configured and utilized by the spectrum and
capacity optimization modules. This integration mainly concerns the control plane and, in particular, the aspects related to resource and capability descriptions, neighborhood, link and Multi Protocol Label Switching (MPLS) Label-Switched Path (LSP) monitoring, unicast and multicast LSP signalling as well as topology forming and maintenance. During the course of this study we have analyzed the problem space, proposed solutions to the resulting research questions and evaluated our approach. Our results show that the now Unidirectional Technology (UDT)-aware architecture can readily consider
Unidirectional Technologies (UDTs) to distribute, for example, broadcast content
Best effort measurement based congestion control
Abstract available: p.
An H.323-based adaptive QoS architecture
Mémoire numérisé par la Direction des bibliothÚques de l'Université de Montréal
Routing and video streaming in drone networks
PhDDrones can be used for several civil applications including search and rescue, coverage,
and aerial imaging. Newer applications like construction and delivery of goods are
also emerging. Performing tasks as a team of drones is often beneficial but requires
coordination through communication. In this thesis, the communication requirements
of video streaming drone applications based on existing works are studied. The existing
communication technologies are then analyzed to understand if the communication
requirements posed by these drone applications can be met by the available technologies.
The shortcomings of existing technologies with respect to drone applications are
identified and potential requirements for future technologies are suggested.
The existing communication and routing protocols including ad-hoc on-demand distance
vector (AODV), location-aided routing (LAR), and greedy perimeter stateless
routing (GPSR) protocols are studied to identify their limitations in context to the
drone networks. An application scenario where a team of drones covers multiple areas of
interest is considered, where the drones follow known trajectories and transmit continuous
streams of sensed traffic (images or video) to a ground station. A route switching
(RS) algorithm is proposed that utilizes both the location and the trajectory information
of the drones to schedule and update routes to overcome route discovery and route error
overhead. Simulation results show that the RS scheme outperforms LAR and AODV by
achieving higher network performance in terms of throughput and delay.
Video streaming drone applications such as search and rescue, surveillance, and disaster
management, benefit from multicast wireless video streaming to transmit identical
data to multiple users. Video multicast streaming using IEEE 802.11 poses challenges of
reliability, performance, and fairness under tight delay bounds. Because of the mobility
of the video sources and the high data-rate of the videos, the transmission rate should be
adapted based on receivers' link conditions. Rate-adaptive video multicast streaming in
IEEE 802.11 requires wireless link estimation as well as frequent feedback from multiple
receivers. A contribution to this thesis is an application-layer rate-adaptive video multicast
streaming framework using an 802.11 ad-hoc network that is applicable when both
the sender and the receiver nodes are mobile. The receiver nodes of a multicast group
are assigned with roles dynamically based on their link conditions. An application layer
video multicast gateway (ALVM-GW) adapts the transmission rate and the video encoding
rate based on the received feedback. Role switching between multiple receiver nodes
(designated nodes) cater for mobility and rate adaptation addresses the challenges of
performance and fairness. The reliability challenge is addressed through re-transmission
of lost packets while delays under given bounds are achieved through video encoding
rate adaptation. Emulation and experimental results show that the proposed approach
outperforms legacy multicast in terms of packet loss and video quality
- âŠ