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In a densely deployed wireless sensor network, a single node has many neighboring nodes with which direct communication would be possible when using sufficiently large transmission power. This is, however, not beneficial; high transmission power requires lots of energy, many neighbors are a burden for a MAC protocol, and routing protocols suffer from volatility in the network when nodes move around. To overcome these problem topology control can be applied. The idea is to deliberately restrict the set of nodes that are considered neighbors of a given node. This paper surveys the most popular and efficient topology control algorithms for wireless ad hoc sensor networks.
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