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Nodes that has no links to declare usually does not transmit TC messages. The exception here is nodes that just lost their MPR selectors. These nodes are to generate empty TC messages for a given interval to update the nodes in the MANET.
But except from this special case, if only declaring MPR selectors in TC messages, only nodes selected as MPRs will generate TC messages. Such a reduction in actual transmitted messages greatly reduces the overall overhead of control traffic.