Robust and Real Time Data Delivery in Wireless Sensor Networks

Abstract

WSNs can be considered a distributed control system designed to react to sensor information with an effective and timely action. For this reason, in WSNs it is important to provide real-time coordination and communication to guarantee timely execution of the right actions. In this paper a new communication protocol RRRT to support robust real-time and reliable event data delivery with minimum energy consumption and with congestion avoidance in WSNs is proposed. The proposed protocol uses the fault tolerant optimal path for data delivery. The proposed solution dynamically adjust their protocol configurations to adapt to the heterogeneous characteristics of WSNs. Specifically, the interactions between contention resolution and congestion control mechanisms as well as the physical layer effects in WSNs are investigated.

RETP: Reliable Event Transmission Protocol in a wireless sensor network

“…In event-to-action delay bound it is based on assumptions such as Observed delay-constrained event reliability (DR o ): It is the number of packets received at the sink within a certain delay bound in a decision interval, Desired delay-constrained event reliability (DR d ): It is the minimum number of packets required for reliable event detection within a certain delay bound and Delay-constrained reliability indicator ( ): i.e., = DR o / DR d. If the observed delay constrained event reliability is higher than the reliability bound i.e., DR o >DR d then the event is reliably detected within a specific delay bound [7]. The drawback with RRRT is congestion detection and control mechanisms lead to extra overhead.…”

“…In RRRT protocol [7], author proposes two concepts such as event-toaction delay bound to meet the application specific deadlines and a combined congestion control mechanism which provide the dual purpose of achieving reliability and conserving energy.…”

Reliable and energy-efficient data transmission in EWSN

“…Another transport layer protocol named as DREET [6], a data-reliable energy-efficient transport protocol aims at providing less data retransmission and energy consumption although it fails at providing a proper congestion-free path to transmit the event information to the sink.In [5], a Reliable Robust and Real time communication(RRRT) protocolwas proposed in whichmechanisms for controlling the congestion in the network and for reducing the event-to-action delay bounds are used. Advantage is that the schemes employed for reducing event-to-action delay bounds and to adjust the operational frequency will provide a reliable and energy conserved event-information but high overhead occurs in turn in the network.…”

A Survey on Event Detection and Transmission Protocols in an Event Driven Wireless Sensor Network

“…In RRRT protocol [7], author proposes two concepts such as event-to-action delay bound to meet the application specific deadlines and a combined congestion control mechanism which provide the dual purpose of achieving reliability and conserving energy. In event-to-action delay bound it is based on assumptions such as Observed delay-constrained event reliability (DR o ): It is the number of packets received at the sink within a certain delay bound in a decision interval, Desired delay-constrained event reliability (DR d ): It is the minimum number of packets required for reliable event detection within a certain delay bound and Delay-constrained reliability indicator (α): i.e.,α= DR o / DR d. If the observed delay constrained event reliability is higher than the reliability bound i.e., DR o >DR d then the event is reliably detected within a specific delay bound [7]. Advantages of RRRT is 1) Reliable event detection based on event-to-action delay bound and 2) Improved energy conserving based on reporting frequency adjustments.…”

“…In this for any sensor node whose buffer overflows due to excessive incoming packets is said to be congested and it informs the sink congestion condition by a Congestion Notification (CN) bit the event packet header [12], 2) Real-time event transport mechanism: DST performs real-time event detection under event-to-sink delay bound. The main components of event -to-sink delay bound are event transport delay and event processing delay [7,12]. According to DSRT, for reliable and timely event detection the event-to-sink delay bound should be greater than or equal to the sum of both event transport delay and event processing delay.…”