Wake-up Schedule Modification for Shorter-Delay Intermittent Wireless Sensor Networks

Intermittent wireless communication is well know and widely available method to reduce the battery power consumption in wireless sensor nodes in wireless sensor networks for achieving longer lifetime of the system and reduction the maintenance overheard. However, it usually results in longer transmission delay of data messages, especially longer end-to-end transmission delay in wireless multihop transmissions of data messages. Better tradeoffs are required to be realized and IRDT-GEDIR has been proposed. It is combination of IRDT intermittent wireless communication protocol and GEDIR location based hop-by-hop ad-hoc routing protocol with one of the solutions of the secretary problem for achieving shorter end-to-end transmission delay. However, the wide distribution transmission delay affects the performance of applications constructed on the wireless networks which depends on the wake-up schedules of all the neighbor wireless sensor nodes. For achieving predictable performance of the system, i.e., to provide the predictable end-to-end transmission delay of data messages in such wireless sensor networks, this paper proposes extensions of IRDT-GEDIR based on the control message overhearing and forwarding. Candidates of a next-hop wireless sensor node overhear a control message for a previous-hop data message transmission and change their wake-up schedule. We design a data message transmission protocol and evaluate the performance in comparison with the conventional IRDT-GEDIR.