MAC-Aware and Power-Aware Image Aggregation Scheme in Wireless Visual Sensor Networks

Table 2

𝐸MAC	Total retransmission power consumption due to collision in the MAC layer
𝑇image	Transmission time for transmitting an image packet
RTS	Transmission time for RTS frame
SIFS	Short interframe space time
𝑒𝑛(𝑟𝑛)	Energy consumption function of node 𝑛 per unit time, which is a function of sensor’s transmission radius
Θ	Maximum propagation delay for transmitting data packet
𝑅𝑛	The set of all possible transmission radii that the node 𝑛 can adopt, which is a discrete set
𝑧𝑛𝑘	= 1 if the node 𝑘 is covered within transmission radius of the node 𝑛 and = 0 otherwise
𝑐𝑛𝑘	The average retransmission times of the node 𝑛 to transmit data to the node 𝑘