Search

Greenhouse gas (GHG) emissions' accumulation in the atmosphere is constantly increasing; since transport sector contributes significantly in rising emissions, substantial action has to be taken, with the support of ICT. Eco-efficient feedback devices, based on smart phone technologies, are becoming more prominent to support and influence drivers to understand their own CO 2 footprint. This paper seeks to evaluate how eco-efficient feedback technologies and which feedback types can contribute to environmental sustainability. In particular, how these technologies can support drivers to achieve more sustainable driving behavior. Feedback types, which influence drivers, are most notably financial savings shown over a longer period and peer reviews.

This paper describes how Quality of Service (QoS) support can be introduced to Overlay Multicast in a Chord Peer-to-Peer network. We support the concept of QoS classes (to support various hop-by-hop QoS parameters such as bandwidth requirements) as well as node to root Round Trip Time (RTT) constraints. Our evaluations show that we can guarantee QoS without changing the basic properties of Chord significantly.

Wireless Mesh Networks (WMNs) operating in the 5 GHz band (IEEE 802.11 a/h) offer a great opportunity to function as wireless access networks. Remote sites that lack direct access to a wired/fibre network may benefit from this technology, as it can be used to bridge possibly large distances. The high gain of directional antennas improves the reception of signals in focused directions and reduces interference from unwanted sources. Therefore, they are the preferred choice for such bridging scenarios. In this paper, we present our experiences with setting up such a Wireless Access Network using directional antennas in the area of Neuchâtel, Switzerland. We describe the necessary equipment and planning steps, highlight common pitfalls and discuss gained insights as well as experimental results. Measured data supports the feasibility of our networking approach, yet reveals the high impact of general challenges that have to be overcome in real-world deployments.

This paper describes how quality of service (QoS) enabled overlay multicast architectures using peer-to-peer (P2P) networks can enhance the experience of end-users in networked virtual environments (NVE). We show how IP multicast, which offers an easy to use API for implementing NVE but is not widely deployed, can be made available to end-users by bridging it transparently with P2P networks. We describe how different P2P and application level multicast (ALM) architectures can be extended with QoS mechanisms using our proposed OM-QoS (overlay multicast QoS) architecture. The presented approach allows users to experience QoS for NVE such as group-based multimedia broadcasting and distributed multiplayer games.

Despite the availability of high bandwidth Internet access for end-users, video broadcasting over the Internet is not widely spread. Multicast communication decreases the network load by eliminating redundancy of the data transfer. However IP multicast was never widely accepted by commercial Internet service providers (ISP). Existing solutions solving this problem, like MBONE tunneling, are not available for end-users accessing the Internet via xDSL or TV cable. Application layer multicast using peer-to-peer (P2P) overlay networks could solve the problem of sparse IP multicast support in the Internet. A limitation of this approach is the lack of standardized interfaces for existing IP multicast applications. We propose a solution, which bridges application layer multicast and IP multicast and uses a P2P (overlay) network to transport multicast data. Our solution - including a "proof-of-concept" prototype - enables video broadcasting over the Internet using existing IP multicast applications without requiring additional service deployment.