By W. Houston
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Extra info for Deep Sky Wonders
4 Topology 31 networks, a sender-initiated protocol is more suitable. For some specialized networks, such as sensor networks, receiver-initiated protocols are a better choice. 4 Topology Although topology is primarily network layer aspect, certain protocols use topology information for making better decisions at the MAC. Exploiting topology-related information at the MAC layer is an example in which crosslayer design can enhance performance. Ad hoc and sensor networks may include nodes with varying capabilities and resources.
6 Increased Control Overhead There are some protocols that are strictly separated from power issues, and therefore do not incorporate power considerations into their behavior. A few of these protocols, however, contain power wasting features. For example, the approach of RICH-DP  is suitable for networks with predictable and periodic traﬃc. In networks that do not ﬁt this description, many RTR messages are sent while no nodes have data to send. In such networks, RTR messages present two causes of power waste.
For some specialized networks, such as sensor networks, receiver-initiated protocols are a better choice. 4 Topology Although topology is primarily network layer aspect, certain protocols use topology information for making better decisions at the MAC. Exploiting topology-related information at the MAC layer is an example in which crosslayer design can enhance performance. Ad hoc and sensor networks may include nodes with varying capabilities and resources. Nodes may also be mobile, so the topology of an active network could change frequently.