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With the rapid advances of wireless communications and portable computing devices, a new computing paradigm which is called "Mobile computing" has evolved. In mobile computing environment, users carrying portable devices have access to data and information services regardless of their physical location or movement behaviour. Wireless LANs (WLANs); allow greater flexibility and portability than traditional wired Local Area Networks (LAN).This environment is called MANET. In MANETs, however, there are many unsolved problems so far: the mobile resource constrains such as limited wireless bandwidth and limited battery life; the mobility of nomadic users and their computers; the intermittent disconnection of mobile users and their computers, etc.
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