An 802.11 wireless ad-hoc network is composed of multiple wireless station devices. It is formed temporarily and one station device communicates with another station device directly instead of through a wireless access point device. When the scale of network becomes larger, the direct communication between any two devices could be unavailable because of long distance or wireless signal blocker. In this case, some devices located between them are required to help forward messages. A routing mechanism is involved to select appropriate forwarder devices. The chosen forwarder devices consist of a routing path between the two communicators.
In this example case, we deploy a wireless ad-hoc network whose network topology is a 10 x 8 matrix. We arrange node #1 (at the upper-left corner) to be the message sender and node #10 (at the upper-right corner) to be the message receiver. In addition, we deploy a cross-shape wireless signal blocker within the network. Because of this signal blocker, node #1 can only communicate with node #10 through the left side, down side and right side of the network matrix. Moreover, to let all nodes cooperate in finding out a routing path from node #1 to node #10, we enable the AODV routing protocol on every node.
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