Hybrid Approach for Energy-Aware Synchronization in Sensor Networks
Yanos Saravanos, Mohamad Haidar, Robert Akl · InTech eBooks · 2010
RBS (E-RBS) algorithm is proposed in (Lee et al., 2006) to decrease the number of messages to be processed and save energy consumption within a given accuracy range. The Reference Broadcast Synchronization Method (RBS)Since GPS and NTP are not very effective in wireless sensor applications, the first major research attempts to create a time synchronization algorithm specifically tailored for sensor networks led to the development of reference broadcast synchronization (RBS) in 2002 (Elson et al., 2002).The algorithm defines a critical path, which is represented by the portion of the network where a significant amount of clock uncertainty exists.A long critical path results in high uncertainty and low accuracy in the synchronization.There are four main sources of delays that must be accounted for to have accurate time synchronization: Send time: this is the time to create the message packet. Access time: this is a delay when the transmission medium is busy, forcing the message to wait. Propagation time: this is the delay required for the message to traverse the transmission medium from sender to receiver. Receive time: similar to the send time, this is the amount of time required for the message to be processed once it is received.The RBS algorithm can be split into three major events:1. Flooding: a transmitter broadcasts a synchronization request packet.2. Recording: the receivers record their local clock time when they initially pick up the sync signal from the transmitter.3. Exchange: the receivers exchange their observations with each other. How to referenceIn order to correctly reference this scholarly work, feel free