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The past few years have witnessed increased interest among researchers in cluster-based protocols for homogeneous networks because of their better scalability and higher energy efficiency than other routing protocols. Given the limited capabilities of sensor nodes in terms of energy resources, processing and communication range, the cluster-based protocols(More)
Supporting video applications over infrastructureless mobile ad hoc networks is more challenging than over any other networks due to the absence of fixed infrastructure and rapid changes in network topology. In this paper, we tackle this problem by adopting the concept of multipoint-to-point (M2P) video transmission together with Multiple Description Coding(More)
This paper proposes the necessity of the secure, ad hoc and ubiquitous communication environment that is integrating personal authentication and usage right management onto the mobile ad hoc network, which is an infrastructureless network suitable to the emergency cases. To implement this environment, this paper studies technical requirements to each layer(More)
Multipath routing has been proposed to improve performance of mobile ad-hoc networks (MANETs). However, due to: (1) nodes lacking of network interface and (2) route coupling, using multiple paths concurrently in conventional single channel MANETs rarely exhibit performance gain. To improve performance, an ad-hoc routing protocol (and its extension) that(More)
The basic reason of handover is to stay connected to the Internet with the intention of reducing connection quality deterioration. In a ubiquitous network, mobile nodes often perform handovers to stay connected to the Internet. These mobile nodes sometimes suffer from performance degradation during handover due to radio interference and reduction of signal(More)
With the increasing use of small, lightweight, powerful and multi-radio devices, and the omnipresence of wireless networks such as WiFi, the pave to ubiquitous computing is gradually emerged and realized. Ubiquitous computing allows users to access their services using any device, anytime, anywhere in a very flexible manner based on the current context. In(More)