Symbol	Description
$\mathcal{S}$	source node
$\mathcal{D}$	set of EDs
n	number of EDs in $\mathcal{D}$
l	packet
L	packet size
${\mathcal{G}}_d$	proximity graph
${\mathcal{D}}_d$	vertex set of ${\mathcal{G}}_d$
${\mathcal{E}}_d$	edges set of ${\mathcal{G}}_d$
$i,j$	indices on set $\mathcal{D}$
${\rho }_i$	reputation coefficient
$de{g}^d\left(i\right)$	degree of vertex i
$p(·)$	probability function
${\delta }_{\mathcal{S},i}$	transmission delay via direct link
${\delta }_{\mathcal{S},j,i}$	transmission delay passing by ED j
${\Delta }_i$	total delay transmission
$\mathcal{R}$	number of selected relays