Towards an Improved Energy Efficient and End-to-End Secure Protocol for IoT Healthcare Applications

Table 1

Notations.

Symbol	Description
N	Number of nodes
Nac	Nodes wake up during Ta
ni	Nodes wake up at the i^th time slot
ai	Nodes have data to send
T	One cycle length
Ta	Time nodes wakeup can affect transmission at t
Tun	Time nodes cannot affect transmission at t
Q	Queue size
S	One data frame size
λ	Arrival rate of data frame
	Initial CW size
	Maximum CW size
m	Maximum backoff stages
τ	One time-slot duration
π0	Empty queue stationary probability
p	Node transmission probability p = PSucc + PColl
πi	State I stationary probability
Ak	k frames are created in time T with probability
A≥k	No less than k frames are created in time T with probability