Learn More
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)
Multimedia broadcast multicast service (MBMS) with inherently low requirement for network resources has been proposed as a candidate solution for using such resources in a more efficient manner. On the other hand, the Next Generation Mobile Network (NGMN) combines multiple radio access technologies (RATs) to optimize overall network performance. Handover(More)
We are studying a daily life-support system for the general public that consists of a community care system (CCS) application and community information network (CIN). CIN provides CCS with connectivity between an individual’s smartphone and city government servers, and at the same time it provides access to not only members of the public but also Internet(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)