ASYMMETRIC PROPAGATION PROXY MODEL

NS-2 supports only symmetric propagation models like Shadowing. It means that the link quality between two nodes is always equal. For example if A hears B with propability of p, B will hear A with the same propability of p. For supporting asymmetric propagation we develop a new propagation model. Unlike the other models it is just a proxy, that will connected with a normal propagation model. The proxy changes the transmission power of the transmitter in dependency of the angle (between transmitter and receiver). You can configure the behaviour of each node by setting the gain (or damping) in dependence of the angle.

The following diagram shows the algorithm of the Asymmetric Propagation Proxy:

First the proxy calculates the angle between transmitter and receiver. For each node a profile exists (if not, it will be generated randomly) in which for a number of angles a gain values are given. The angle is linear mapped to a gain value. This gain is used to modify the transmission power (an exponential function). At the end the common routines of the connected propagation model (for example shadowing) are invoked.

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