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— Due to the increasing deployment of conversational real-time applications like VoIP and videoconferencing, the In-ternet is today facing new challenges. Low end-to-end delay is a vital QoS requirement for these applications, and the best effort Internet architecture does not support this natively. The delay and packet loss statistics are directly coupled(More)
The NNN-UTS project (Nordområdenes Nye Nervesystem – Undervanns Trådløst Sensornettverk) has aimed to develop wireless network technology for underwater sensor networks, employing acoustic communication to realize wireless functionality in water. Research and development has been carried out in 2006-2009. A final sea(More)
Musical collaboration over telecommunication networks has marvellous possibilities when it comes to musical education, practise and performance. The deployment and use of high-capacity digital networks makes it possible to obtain end-to-end audio and video latency of 5−20 milliseconds, which is similar to the audio time delay typically experienced between(More)
This paper presents an Active Queue Management (AQM) design based on a Proportional control system, which is shown to provide good conditions for rate adaptive real-time applications. Simulation results show that rate adaptive media sources over RTP/UDP achieve an aggregate core link utilization in the region 97.5–99.9%, with controlled delay and stochastic(More)
This paper compares the performance of two algorithms for congestion control of streaming media. The two methods are Datagram Congestion Control Protocol (DCCP) over RED, and a solution based on an Active Queue Management (AQM) combined with explicit feedback of congestion level experienced at routers. DCCP relies on binary congestion met-rics, either as(More)
The integration of communication and computation technologies, the availability of pocket mobile computers, and the widespread penetration of mobile radio access networks will enable a range of new context-aware mobile services to be offered to the users. Research on methods and technologies for the development of such services requires the involvement of(More)
(Active Queue Management) enabled router. The design is based on a classical proportional control system. The application of such a router is to enhance streaming media over IP performance by avoiding bursty packet drop situations, control the router queue delay, and balancing packet drop, delay, and link utilization. The selected AQM equilibrium point(More)
Routing for low latency underwater acoustic network-communication is investigated. The application is monitoring of ice-threats to offshore operations in the Arctic-to provide warnings that enable operators to react to such threats. The scenario produces relatively high traffic load, and the network should favour low delay and adequate reliability rather(More)
Ubiquitous and IoT (Internet of Things) systems consist of many parts, are highly distributed and need to be adaptive in a highly dynamic environment. The exploitation of adaptation possibilities at different layers needs to be coordinated to get an optimal result. However, it is difficult to test and evaluate such distributed systems with regard to their(More)
In order to meet the demand for increased capacity in wireless networks, incorporating femtocells within the coverage of macrocells constitutes one of the strategies that currently receives most attention from both industry and academia. Femtocells may either be part of a HetNet as standardised within 3GPP, or constitute the secondary system in cognitive(More)