A Survey of Compressive Data Gathering in WSNs for IoTs

Table 1

Routing protocols of CDG.

Ref.	CDG scheme	Routing method	Main contribution	Year
[8]	Sparse CDG	MST	Propose a distributed method of sparse CDG	2014
[9]	Sparse CDG	eMSTP	Take the sink as the root of MST in sparse CDG	2014
[10]	Sparse CDG	WCDA	Consider the tree’s cost which taking hops and distances in routing paths	2016
[11]	Sparse CDG	Random walk (RW)	Firstly adopt random walk (RW) in sparse CDG	2015
[12]	Sparse CDG	RW	Analyze the optimal transmission range of nodes in RW-based CDG	2017
[13]	Sparse CDG	RW	Propose a global mathematical model of RW-based CDG	2019
[14]	Sparse CDG	Direct RW	Overcome the weakness of directionless feature in RW-based CDG	2019