In the future, communication devices, communication-capable devices or sensors and home electronic appliances will have the capability to form various MANETs, and interoperate with the global communication networks. These MANETs play an important role in supporting various visions toward the creation of a world of ubiquitous computing where computation is integrated into the environment, rather than having computers that are distinct objects. One of the goals of ubiquitous computing is to enable devices to sense changes in their respective surroundings and to automatically adapt and act on these changes based on user needs and preferences. With ubiquitous computing, people can move around and interact with computers, devices and home appliances more naturally than they currently do.