Wireless Sensor Networks, Mobile Nodes Access Study

The introduction of low-power, low cost wireless devices has allowed networks to support functionality beyond simple communication. Traditional wireless networks, composed of primarily immobile units will be replaced with untethered networks supporting a combination of stationary and mobile nodes. It has become possible to envision a new paradigm by which a large group of wireless nodes can participate in tasks such as high-rate mobile multimedia data transfer, environmental sensing and sampling, homeland security and defense, and health monitoring.A Hybrid Ad-Hoc Sensor Network (HANET) is presented, consisting of both mobile and stationary nodes. Wireless sensors in this domain consist of densely distributed, low-power, energy constrained stationary sensors, which are able to form MAC level connections and Network level multi-hop routes at runtime. The limited energy supplies and the interaction of sparse mobile nodes impose stringent requirements for low-complexity, low-energy, distributed protocol design.The EAR protocol (Eavesdrop and Register) assumes a mobile-centric view of connection maintenance, as the mobile nodes are assumed to have fewer constraints on energy supplies as compared to the stationary nodes. The mobile node forms a registry based on "Eavesdropping" the signals native to the stationary network's MAC protocols. On this paper, we are based on the EAR protocol and simulate it, also we the proved methed is presented.