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Nowadays the need for wireless communication services and networks is continuously increasing for different kind of mobile applications (commercial, entertainment, military, aeronautics, navigation, etc.) Bandwidth management is an important task of the administrative tool to provide quality of service (QoS) for real time applications (voice, video and so on). IEEE 802.11 standard is widely used in...
Bandwidth management in 802.11 wireless networks is becoming the main issue that should be overcome for IP multimedia services delivery such as IPTV, VoD, VoIP, etc. In this paper, we propose an adaptive bandwidth allocation based on adaptive transmission opportunity to overcome the guaranteed bandwidth issue. This scheme allows the video stream to take up the 802.11 channel proportionally to its...
This paper proposes a channel error adaptive FEC algorithm to balance the conflict between the QoS of video transmission and the bandwidth utilization ratio in wireless IP networks. Two analytic models are derived, one is playable frame rate in MPEG video stream, another is effective utilization ratio of FEC. Based on these analytic models, quality of video stream and effective utilization ratio of...
The current trend in wireless systems is evolving towards Fourth Generation (4G). 4G prescribes that users can enjoy mobility, seamless access and high quality of service in an all-IP network on an ldquoAnytime, Anywhererdquo basis. The 4G network access comprises of multiple heterogeneous geographically coexisting wireless networks. In this paper we propose a mechanism for the allocation of the downlink...
This paper studies the problem of adaptive resource allocation for downlink transmission at the base station (BS) of future multi-service IP-based networks. A delay margin based scheduling (DMS) approach is proposed to determine the queuing priority of an incoming packet by taking into consideration the distance between its currently experienced delay and its maximum allowed limit since such an instantaneous...
The demand for rich multimedia content is continuously increasing as exemplified by the success of sites such as YouTube, Google Video, and others. Critically, the richness of multimedia content places significant demands on the limited bandwidth available in wireless networks. To that end, this paper proposes a novel mechanism, opportunistic wireless broadcast (OWB), that opportunistically aggregates...
This paper studies and develops efficient traffic management techniques at the base station of future multi-service IP-based network. The proposed scheduler does not only consider the delay requirements of each traffic class in a static manner, but also the instant delay margin of each packet. This is due to the fact that the instant delay margin is significantly more meaningful than the delay requirement...
Under the upcoming 4G network, mobile devices will have to handle multiple interfaces. Each network mechanism has its merits, such as WiFi's high speed and the long transmission range of High Speed Download Packet Access (HSDPA), but managing a combination of different interfaces during a hand-off procedure presents new challenges for next-generation networks because the network environment will continue...
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