(1) It assumes that nodes always have data to send & the nodes including CH are started with the
same initial energy.
(2) No. of CHs are predefined i.e. 5% or 10% of total nodes. It might not be sufficient to cover
entire area when sensor nodes are not uniformly distributed.
(3) The CHs are randomly selected rotationally and Residual Energy of the node is not considered
for cluster formation.
(4) CHs in the network are not uniformly distributed, so sometimes elected CHs will be
concentrated in one part of n/w, hence some nodes in the n/w will not have any CH in their
vicinity, so it not provides proper location of CH.
(5) CHs send aggregated data to BS in single hop manner so LEACH is not applicable to networks
deployed in large regions.
(6) It consist of rounds while in each round, all sensor nodes take part in reconstructing new
clusters and this action consumes a lot of energy.
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