IEEE Standard 802.16 sets the stage for broadband wireless access system. This standard includes the medium access control layer (MAC) and physical layer with higher data rates and longer transmission range compared to those supported by the existing wireless technologies. It also provides QoS (Quality of Service) for the applications such as Voice over IP, video streaming and high bandwidth fi...

Wireless Local Area Networks (WLANs) have become increasingly popular over the last number of years. During this time, user requirements have evolved, resulting in a more diverse mix of services being carried over the radio interface. In particular, delay sensitive real-time applications such as streaming multimedia and voice over wireless IP are growing in importance. The widely accepted IEEE ...

This paper presents MANET-VoVON, a new Internet application for mobile ad-hoc networks (MANETs) providing voice over virtual overlay networks. A MANET-enabled version of JXTA peer-to-peer modular open platform (MANET-JXTA) is used to support user location and optionally, audio streaming over the JXTA virtual overlay network. Using MANET-JXTA, a client can search asynchronously for a user, and d...

A joint management of radio resources in heterogeneous networks is considered to raise efficiency. In this paper we focus on joint schemes for admission control and access technology selection using vertical handoff. We study a system where both streaming and elastic traffic are supported, and two radio access technologies covering the same areas are available: TDMA and WCDMA. Optimal solutions...

Within the EMBRACE project an advanced communications system and network was developed. It uses the DVB technology for the high-speed downlink and a novel multi-frequency TDMA system for the return link. The return link is scaleable to accommodate the variety of data rates. Emphasis was put on providing quality of service (QoS) in wireless IP networks. Site diversity is used to increase the ava...

Over the past twenty years, the transformation of a relatively simple computer network used by a few researchers into a global Internet, involving hundreds of millions of people and generating a new economic order, took government, business and education, by surprise. Given the well-established tendency for people to underestimate the extent and rate of technological change, it seems reasonable...

WiMAX IEEE802.16e standard is proposed as an attractive wireless communication technology for providing broadband access. For the network and application-level capacity and performance analysis, we first provide a short overview on mobile WiMAX networks, and then describe mobile WiMAX PHY and MAC layer. Afterward we present and discuss the benefits and challenges of flat architecture for mobile...

This document describes IAX, the Inter-Asterisk eXchange protocol, an application-layer control and media protocol for creating, modifying, and terminating multimedia sessions over Internet Protocol (IP) networks. IAX was developed by the open source community for the Asterisk Private Branch Exchange (PBX) and is targeted primarily at Voice over Internet Protocol (VoIP) call control, but it can...

Applications such as Voice over IP and video streaming require continuous network service, requiring fast failure recovery mechanisms. Proactive failure recovery schemes have been recently proposed to improve network performance during the failure transients. These proactive failure recovery schemes need extra infrastructural support in the form of routing table entries, extra addresses etc. In...

Wireless Local Area Networks (WLANs) have become increasingly popular over the last number of years. During this time, user requirements have evolved, resulting in a more diverse mix of services being carried over the radio interface. In particular, delay sensitive real-time applications such as streaming multimedia and voice over wireless IP are growing in importance. The widely accepted IEEE ...