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

Figure 2

(a) Sensor nodes in different rings get different candidate areas which are determined by the angle calculated according to adaptive duty cycle. Since the duty cycle of is smaller than , the calculated angle is smaller than . (b) When is forwarding packets, if all the candidates of showed in (a) are not awake, it will change into to get more candidates until equals to or a candidate wakes up.

(a)

(b)