Wireless body Area networks (WBANs) include a number of sensor nodes placed inside or on the human body to improve patient health and quality of life. Ensuring the transfer and receipt of data in sensitive data is a very important issue. Routing algorithms should support a variety of service quality such as reliability and delay in sending and receiving data. Loss of information or excessive da...

Contemporary Voice-Over-IP (VoIP) systems typically negotiate only one codec for the entire VoIP session life time. However, as different codecs perform differently well under certain network conditions like delay, jitter or packet loss, this can lead to a reduction of quality if those conditions change during the call. This paper makes two core contributions: First, we compare the speech quali...

A key component of an efficient multipath routing is the optimal traffic allocation strategy that deals with how the traffic should be distributed among the multiple paths. In this study, two intelligent traffic distribution policies that minimise the experienced delay by the end user are proposed. For such delay minimisation, the authors investigate and compare average delay minimisation and m...

In the Internet, because of huge scale and distributed administration, it is of practical importance to infer network-internal characteristics that cannot be measured directly. In this paper, we propose a general method of determining characteristics of links from given characteristics of end-to-end paths. Our method can be applied to an arbitrary path-topology. Furthermore we show the general ...

Routing in telecommunication networks rely on the definition of performance indicators called routing metrics. Popular routing metrics are the route throughput, end-to-end delay and jitter. However, in a delay tolerant network displaying link disruptions, these metrics may be questionable. This contribution proposes six metrics for characterising routes in a delay tolerant network. These metric...

Next generation of wireless Internet scenarios include LEOs (Low Earth Orbit Satellites). Lower altitudes of LEO constellations could allow global coverage while offering: low end-to-end propagation delay, low power consumption, and effective frequency usage both for the users and the satellite network. LEOs rotate asynchronously to the earth rotation. Fast movement of LEOs makes it necessary t...

Delay Tolerant Networks (DTN) generally lack end-to-end connectivity and multiple message copies routing protocols are often used to improve the efficiency that messages are delivered successfully, but network load is increased due to a large number of message copies. A new scheme based on threshold is presented to control message copies efficiently in the networks. A contact counter is added i...

This paper presents a time-sensitive scheduler oriented to delay differentiation in class-based networks, studying its behaviour from a single node to an end-to-end perspective. The novel feature of this scheduler is that it tries to bound the queuing delay per class and, simultaneously, to control the excess queuing delays in order to avoid class starvation. The study analyses the scheduler be...

This document describes the end-to-end protocol, block formats, and abstract service description for the exchange of messages (bundles) in Delay Tolerant Networking (DTN). This document was produced within the IRTF’s Delay Tolerant Networking Research Group (DTNRG) and represents the consensus of all of the active contributors to this group. See http://www.dtnrg.org for more information. Scott ...