A Scalable Network Architecture for Distributed Virtual Environments with Dynamic QoS over IPv6

Virtual environments (VEs) are interactive computer simulations that immerse users in an alternate reality. Distributed VE (DVE) applications simulate the experience of real-time interaction among multiple users in a shared three-dimensional (3-D) virtual world. In this paper, we identify the network service requirements for highly interactive DVEs and show the limitations of IPv4 in satisfying them. We propose a transport system for DVE applications, which incorporates a scalable network architecture and dynamic QoS adaptation over IPv6. The network communication architecture combines the advantages of anycasting, unicasting and multicasting while the dynamic QoS adaptation assists the DVE applications in adapting to fluctuations in the network. The network-specific issues are hidden from the application by means of a networking module and a well-defined Application Program Interface (API). The implementation of a DVE application, called Virtual Environment Supporting Multi-user Interaction over IPv6 (VESIR-6), using this architecture , is explained

Advanced Wireless LAN

The past two decades have witnessed starling advances in wireless LAN technologies that were stimulated by its increasing popularity in the home due to ease of installation, and in commercial complexes offering wireless access to their customers. This book presents some of the latest development status of wireless LAN, covering the topics on physical layer, MAC layer, QoS and systems. It provides an opportunity for both practitioners and researchers to explore the problems that arise in the rapidly developed technologies in wireless LAN