Table 2.

Classification of Different Clustering Routing Protocols in WSNs.

Clustering Routing Protocols		LEACH	HEED	DWEHC	PANEL	TL-LEACH	UCS	EECS	EEUC
Cluster characteristics	Variability of cluster count	variable	variable	variable	fixed	variable	variable	variable	variable
	Uniformity of cluster sizes	even	even	even	even	even	uneven	uneven	uneven
	Intra-cluster routing	single-hop	single-hop	multiple-hop	single-hop	single-hop	single-hop	single-hop	single-hop
	Inter-cluster routing	single-hop	single-hop multiple-hop	single-hop	multiple-hop	multiple-hop	multiple-hop	single-hop	multiple-hop
Cluster-head characteristics	Existence	cluster-head based	cluster-head based	cluster-head based	cluster-head based	cluster-head based	cluster-head based	cluster-head based	cluster-head based
	Difference of capabilities	homogeneous	homogeneous	homogeneous	homogeneous	homogeneous	heterogeneous	homogeneous	homogeneous
	Mobility	stationary	stationary	stationary	stationary	stationary	stationary	stationary	stationary
	Role	relay aggregation	relay aggregation	relay aggregation	relay aggregation	relay aggregation	relay aggregation	relay aggregation	relay aggregation
Clustering process	Control manners	distributed	distributed	distributed	distributed	distributed	distributed	distributed	distributed
	Execution nature	probabilistic	iterative	iterative	probabilistic	probabilistic	probabilistic	probabilistic	probabilistic
	Convergence time	constant	constant	constant	constant	constant	constant	constant	constant
	Parameters for CH election	adaptive	adaptive	adaptive	adaptive	adaptive	adaptive	adaptive	adaptive
	Proactivity	proactive	proactive	proactive	proactive	proactive	proactive	proactive	proactive
	Objectives	load balancing	load balancing	load balancing	load balancing reliability	load balancing lifetime extension	load balancing lifetime extension	load balancing periodical data communications	load balancing
Entire proceeding of the algorithm	Algorithm stages	cluster construction	cluster construction	cluster construction	cluster construction	cluster construction	cluster construction	cluster construction	cluster construction
Cluster characteristics	Variability of cluster count	variable	variable	variable	fixed	variable	variable	variable	variable
	Uniformity of cluster sizes	even	even	even	even	even	even	uneven	even
	Intra-cluster routing	single-hop	single-hop	multiple-hop	simple-hop	single-hop	single-hop	multiple-hop	single-hop
	Inter-cluster routing	single-hop	single-hop multiple-hop	single-hop	multiple-hop	multiple-hop	multiple-hop	multiple-hop	multiple-hop
Cluster-head characteristics	Existence	cluster-head based	cluster-head based	no-cluster-head based	cluster-head based	cluster-head based	cluster-head based	cluster-head based	cluster-head based
	Difference of capabilities	homogeneous	homogeneous	N/A	homogeneous	homogeneous	heterogeneous	homogeneous	homogeneous
	Mobility	stationary	stationary	N/A	stationary	stationary	stationary	stationary	stationary
	Role	relay aggregation	relay aggregation	N/A	relay aggregation	relay aggregation	relay aggregation	relay aggregation	relay aggregation
Clustering process	Control manners	distributed	centralized	distributed	distributed	distributed	distributed	distributed	distributed
	Execution nature	iterative	iterative	probabilistic	probabilistic	probabilistic	probabilistic	probabilistic	probabilistic
	Convergence time	constant	constant	constant	constant	constant	constant	constant	constant
	Parameters for CH election	adaptive	adaptive	adaptive	adaptive	adaptive	adaptive	adaptive	adaptive
	Proactivity	proactive	proactive	proactive	reactive	proactive reactive	proactive	proactive	proactive
	Objectives	load balancing	load balancing	load balancing	reactive scenes lifetime extension	proactive scenes reactive scenes	scenes of multiple mobile sinks	lifetime extension	lifetime extension
Entire proceeding of the algorithm	Algorithm stages	cluster construction	cluster construction	data transmission	data transmission	data transmission	data transmission	data transmission	data transmission