Event reliability in Wireless Sensor Networks

Abstract

Ensuring reliable transport of data in resource constrained Wireless Sensor Networks (WSNs) is one of the primary concerns. The two reliability mechanisms typically used in WSNs are packet reliability and event reliability. Packet reliability requires all packets from all the sensor nodes to reach the sink that can result in wastage of sensors' limited energy resources. The sensing regions of densely deployed sensor nodes often overlap with one another and data from nodes that are in close proximity tend to exhibit high level of spatial locality. This introduces the concept of event reliability where a reliable transfer of event data from each sensing region in a sensor network is sufficient. This paper proposes the Event Reliability Protocol (ERP) that enables reliable transfer of packets containing information about an event to the sink while minimizing similar redundant packets from nodes in the vicinity of one another. ERP builds on the spatial locality condition and employs an implicit acknowledgement (iACK) mechanism with region-based selective retransmissions. The performance of ERP is evaluated and compared against a commonly used iACK scheme to show that ERP significantly improves event information delivery and network scalability, thus maintaining good coverage of events in the sensor network.

Towards Achieving Reliability in Wireless Sensor Networks –A Survey

“…Mahmood et al [29], proposed Event Reliability Protocol (ERP), whose objective is to provide reliable delivery of information regarding event occurrence to the sink. Authors have proposed a spatio-temporal correlation mechanism to ensure that packets containing information about same event are not transmitted thus reducing traffic.…”

A Survey on Modeling and Enhancing Reliability of Wireless Sensor Network

“…So the enumeration methods can be employed for networks of relatively small size and there is a need of faster computational procedures that can provide an accurate approximation of complex WSN. In [43] paper, the author present a hexagon tessellation sensor network model with role assignment scheme and estimate the reliability and lifetime distribution by employing a new improved Monte Carlo scheme which incorporates both simulation and analytic methods and is suitable for the WSN. Also it is shown that the node sub-roles and node density have important effects on the network reliability and lifetime.…”

RETP: Reliable Event Transmission Protocol in a wireless sensor network

“…When the node hears that the next hop node transmitting the packet it has sent, it is an implicit acknowledgement that the packet is forwarded successfully [14]. And the node then removes the packet from the queue end and the next packet in the queue is processed.…”