Low-Delay Opportunistic Routing with Reducing Overhead in Asynchronous Duty-Cycled Wireless Sensor Networks

Table 1

Notation.

Symbol	Description
	The network ; is sensor node
	The neighbor node set of
	The candidate set of
	The Euclidean distance between and
	The duty length
	The initial duty length broadcasted by sink
	The radius of circular area
	The communication radius of sensor nodes
	The candidate area of
	The cycle time of
	The network density
	The initial angle of candidate area which is broadcasted
	The angle of candidate area for
	The packet transmission delay
	The ring where is located