Interactive Design and Delivery Challenges for Wireless Handheld Multimedia Systems

The mobile media market is a new communication channel with its own characteristics and opportunities. Streaming on your mobile phone is not watching TV or going to the movies. Instead, the mobile channel provides personalization, interactivity and anytime, anywhere services. Content delivery in mobile multimedia is an application area that offers big business potential, as the users of mobile devices want to access multimedia content from their devices. People want to use it anytime, anywhere and in whatever way they choose. Mobile applications should therefore present adaptable multimedia content to different end-user devices. And with content presented in a dynamic environment, this presents new challenges. Hence, multimedia content has to be adapted to fit the constraints of the device. Handheld devices with increasing multimedia enabling features and diverse capabilities are undergoing considerable progress because of portability and mobility. This paper looks at the design and security challenges facing multimedia content and context delivery

Hardware assisted misbehaving nodes detection in mobile ad hoc networks

The mobility feature leads to the proliferation of wireless networks. Among all kindsof wireless networks, the peer-to-peer nature of Mobile Ad hoc Networks (MANET)makes such networks very promising. Unlike traditional wired networks, MANETs donot need infrastructure to work properly. The most commonly used routing protocols formobile ad hoc networks do not take into consideration security, assuming all the mobilenodes will coordinate with each other. Such routing protocols along with the absence ofinfrastructure make MANETs prone to a variety of faults such as packet dropping, packetmisrouting, etc.This dissertation addresses the security issues of MANET by presenting the hardwareassisted misbehaving nodes detection. In such a scheme, the hardware is responsible fordetecting the misbehaving nodes. The detection results are sent to software layer ofmobile nodes. Upon receiving the detection results, the software layer can exclude themisbehaving nodes from the networks.This dissertation presents two hardware detection schemes. Two-timer is a low-costdetection scheme. There are only two timers utilized in the scheme. The two-timerscheme can be used to detect simple packet dropping with good detection performance.The other detection scheme, cache scheme, can detect both packet dropping and packetmisrouting. The cache scheme needs more resource than the two-timer scheme alongwith better detection performance