This paper introduces a novel multi-copy routing protocol, called Predict and Forward (PF), for Delay Tolerant Networks (DTNs), which aims to explore the possibility of taking mobile nodes as message carriers for end-to-end delivery of the messages. With PF, the message forwarding decision is made by manipulating the probability distribution of future intercontact and contact durations based on...

Most disruption-tolerant networking (DTN) protocols available in the literature have focused on mere contact and intercontact characteristics to make forwarding decisions. Nevertheless, there is a world behind contacts: just because one node is not in contact with some potential destination, it does not mean that this node is alone. There may be interesting end-to-end transmission opportunities...

Delay tolerant networks (DTNs) are wireless networks in which an end-to-end path for a given node pair can never exist for an extended period. It has been reported as a viable approach in launching multiple message replicas in order to increase message delivery ratio and reduce message delivery delay. This advantage, nonetheless, is at the expense of taking more bu er space at each node. The co...

Applications in high speed ATM networks will specify quality of service (QoS) requirements on an end-to-end basis. Typical application QoS metrics are cell loss rate, delay jitter, throughput, and maximum delay. Obviously, the individual network control components will need to provide more stringent quality of service than speciied by the application. In this paper, we study (via simulation) ho...

Mobile networks are intriguing in recent years due to their practical implications. Previous routing strategies for improving transport efficiency have little attention what order should the packets be forwarded, just simply used first-in-first-out queue discipline. Here we apply priority queueing discipline to shortest distance routing strategy on mobile networks. Numerical experiments show it...

A new end-to-end seamless mobility management protocol, called Seamless IP diversity-based Generalized Mobility Architecture (SIGMA), which utilizes multi-homing to achieve seamless handover of a mobile host and overcomes a number of performance bottlenecks and security limitations of Mobile IP, has been proposed in the literature. Various performance aspects of SIGMA have been widely studied i...

Optical interconnections offer a potential for gigahertz transfer rates in an environment free from capacitive bus loading, crosstalk, and electromagnetic interference. Device technology in electrooptics has matured to a point where small, low power, and low cost devices exist which are suitable for use in bus level implementations. Therefore, the realization of physically distributed, bus-inte...

A new model for perceptual evaluation of speech quality (PESQ) was recently standardised by the ITU-T as recommendation P.862. Unlike previous codec assessment models, such as PSQM and MNB (ITU-T P.861), PESQ is able to predict subjective quality with good correlation in a very wide range of conditions, that may include coding distortions, errors, noise, filtering, delay and variable delay. Thi...

Opportunistic network is a type of Delay Tolerant Networks (DTN) where network communication opportunities appear opportunistic, an end-to-end path between source and destination may have never existed, and disconnection and reconnection is common in the network. With numerous emerging opportunistic networking applications, strategies that can enable effective data communication in such challen...