5 research outputs found
An Adaptive Multimedia-Oriented Handoff Scheme for IEEE 802.11 WLANs
Previous studies have shown that the actual handoff schemes employed in the
IEEE 802.11 Wireless LANs (WLANs) do not meet the strict delay constraints
placed by many multimedia applications like Voice over IP. Both the active and
the passive supported scan modes in the standard handoff procedure have
important delay that affects the Quality of Service (QoS) required by the
real-time communications over 802.11 networks. In addition, the problem is
further compounded by the fact that limited coverage areas of Access Points
(APs) occupied in 802.11 infrastructure WLANs create frequent handoffs. We
propose a new optimized and fast handoff scheme that decrease both handoff
latency and occurrence by performing a seamless prevent scan process and an
effective next-AP selection. Through simulations and performance evaluation, we
show the effectiveness of the new adaptive handoff that reduces the process
latency and adds new context-based parameters. The Results illustrate a QoS
delay-respect required by applications and an optimized AP-choice that
eliminates handoff events that are not beneficial.Comment: 20 pages, 14 figures, 4 table
Multimedia
The nowadays ubiquitous and effortless digital data capture and processing capabilities offered by the majority of devices, lead to an unprecedented penetration of multimedia content in our everyday life. To make the most of this phenomenon, the rapidly increasing volume and usage of digitised content requires constant re-evaluation and adaptation of multimedia methodologies, in order to meet the relentless change of requirements from both the user and system perspectives. Advances in Multimedia provides readers with an overview of the ever-growing field of multimedia by bringing together various research studies and surveys from different subfields that point out such important aspects. Some of the main topics that this book deals with include: multimedia management in peer-to-peer structures & wireless networks, security characteristics in multimedia, semantic gap bridging for multimedia content and novel multimedia applications