Providing a certain quality of service (QoS) for multimedia
transmissions over a noisy wireless channel has always been a
challenge. The IEEE 802.11 standardization dedicates a working
group, group e, to investigate and propose a solution for enabling
IEEE 802.11 networks to provide multimedia transmissions with
certain QoS supports. As drafted in the latest draft release, the
IEEE 802.11e working group proposes the use of contention based
mechanism to achieve the transmissions of prioritized traffic, which
in turn provides a framework to support multimedia transmissions
over IEEE 802.11 networks. However, such a contention based priority
scheme does not deliver a strong QoS capability.
In this paper, we first study the characteristics of the IEEE
802.11e network. For all the four defined priorities of IEEE
802.11e, we first investigate their capacity characteristics. We
then design a resource allocation technique to better utilize the
bandwidth and improve the performance of video transmissions. Our
design uses a QoS mapping scheme according to the IEEE 802.11e
protocol characteristics to deliver scalable video. In addition, we
design an appropriate cross-layer video adaptation mechanism for the
scalable video that further improves the video quality combining
with our proposed resource allocation technique. We have evaluated
our proposed technique via simulations (NS2). We use PSNR as our
video quality measures. Our results show improvement in video
quality and resource usage when our proposed technique is
implemented.
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