Table 1.

List of notations.

Notation	Description
$>>$	Message forwarding from left to right node
$ack$	Acknowledgment in response to $RES$
${\alpha }_f$	Set of free time slots
$B_f$	Best forwarder intermediary relay node
$B_f\text{\_}ID$	$B_f$ Identity
$\chi$	Range of speeds for nodes
C	Set of member nodes in a cluster
$\overline{CH}$	Set of cluster heads
$C{H}_B$	A randomly selected CH for clock synchronization
$C{H}_B\text{\_}ID$	Identity of $C{H}_B$
$C{H}_i\text{\_}ID$	Identity of the $ith$ cluster head
D	Destination node
${\daleth }_s$	Time slot on the frame to transmit messages
$dec$	Acceptance/rejection field of relay service
$\delta$	Final distance between nodes
$H(.)$	Hamming distance function
$\kappa$	Direction component
$\mu$	L1-norm distance between nodes
$Min(.)$	Minimum function
N	Set of all nodes
$NW$	A non-warning message
R	Set of intermediary relay nodes
Rand(.)	Random selection function
$REQ$	Request message
$RES$	Response message
$\rho$	Collision probability among nodes
S	Source node
$SL$	Severity level of a warning message
$SN$	Message type
T	Local clock time of a node
$validate\text{\_}timer$	Node’s timer validation field
W	A warning message