Especially scenarios like public safety or battle field require reliable Multicast (voice) communication. There are different ways to choose and maintain the groups of receivers. One alternative for certain use cases, especially for areas of danger, is Geocast. Using Geocast, a receiver is defined by its geographic position. Especially for mobile ad hoc networks (MANETs) there are several Geocast routing protocols that solve the problem of finding a path to the Geocast region. In the Geocast region the messages are flooded. Generally, a Geocast protocol assumes that each node knows its own geographic position. In reality this implies the existence of a system such as the Global Positioning System (GPS), EGNOS, or GALILEO. Using one of these systems, a node can determine its position up to 5m accuracy. In [YKC04] several Geocast routing protocols are classified and their performance is evaluated. In addition to this, it is important to know how to set the parameters of the different protocols. Thus, in this paper we will at first describe two different Geocast routing protocols (section 2). Next, we will describe the evaluation environment (section 3). After this, we will show in detail, how the parameters can be set (section 4). Finally, we will show briefly some performance evaluation results (section 5) and conclude our paper (section 6).
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