QoS support and network survivability are crucial issues in optical burst switched (OBS) networks to form a smooth transition toward next generation optical Internet. This paper presents a QoS-based restoration mechanism for OBS networks based on offset time extensions. Simulation studies verified the role of the offset time in the restoration mechanism and its attitudinal character to define QoS levels.

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Wireless technology is accelerating so rapidly. With the evolution of wireless technologies (GPRS, EDGE, cdma2000, W-CDMA), wireless networks is aiming to alter from voice-centric networks to an efficient and flexible data networks. This development beside the advancements in wireless computing and devices had allowed an increased number of multimedia applications to appear in our era. Many components are coming together to make mobile multimedia a reality. This paper will investigate the road map of mobile data networks, their evolution and capabilities to handle today and future increased-demand for wireless multimedia applications. The focus will aim third generation (3G) wireless networks and the amendment toward fourth generation (4G).