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By Stefano Basagni; et al

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In essence, FSR will propagate link state information to other nodes in the network based on how far away (defined by scopes, which are determined by number of hops) the nodes are. The protocol will propagate link state information more frequently with nodes that are in a closer scope as opposed to ones that are further away. This means that a route will be less accurate the further away the node is, but once the message gets closer to the destination, the accuracy increases. 4. TECHNICAL CHALLENGES AND RESEARCH OVERVIEW 23 [77, 78] builds on top of FSR and achieves hierarchical routing by partitioning the network nodes into different mobility groups.

5 depicts a typical scenario in which the exposed-terminal problem may occur. Let us assume that terminals A and C can hear transmissions from B, but terminal A cannot hear transmissions from C. Let us also assume that terminal B is transmitting to terminal A, and terminal C has a frame to be transmitted to D. According to the CSMA scheme, C senses the medium and finds it busy because of B’s transmission, and, therefore, refrains from transmitting to D, although this transmission would not cause a collision at A.

As in proactive protocols, routing information is constantly updated, routes to every destination are always available and up-to-date, and, hence, end-to-end delay can be minimized. For on-demand protocols, the source node has to wait for the route to be discovered before communication can happen. This latency in route discovery might be intolerable for real-time communications. In [57], the authors present a set of tables that summarize the main differences between these protocols in terms of their complexity, route update patterns, and capabilities.

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