Enhancement of Routing Performance for Energy Efficiency and Critical Event Monitoring in Wireless Sensor Network

IOSR Journal of Computer Engineering (IOSR-JCE)
e-ISSN: 2278-0661,p-ISSN: 2278-8727, Volume 17, Issue 3, Ver. V (May – Jun. 2015), PP 87-94
www.iosrjournals.org
DOI: 10.9790/0661-17358794 www.iosrjournals.org 87 | Page
Enhancement of Routing Performance for Energy Efficiency and
Critical Event Monitoring in Wireless Sensor Network
Mr. Aniket D. Kharat1
, Dr. U. L. Bombale 2
1
M. Tech-II Electronics Technology, 2
Associate Professor/ET,
Department of Technology, Shivaji University, Kolhapur, India
Abstract: In Wireless Sensor Network, because of limitation on sensor node energy, the energy efficiency is a
major concern which should be deliberated while planning to design a protocol. To overcome this conflict, data
grouping and accumulation should be done in this issue to decrease consumption of sensor node energy and
cost of communication by aggregating data redundancy at intermediate sensor nodes to reduce number and size
of alarming messages in critical event monitoring. The network for design is Ad-Hoc network. In this paper we
proposed an improved algorithm Improved-Data Routing for In-Network Aggregation Data (I-DRINA) whose
results are compared with existing known protocols as Data Routing for In-Network Aggregation (DRINA) and
Low Energy Adaptive Clustering Hierarchy (LEACH). The proposed protocol has designed for improvement in
path routing in network and stables the energy consumption in the wireless network to prolong the existence of
network for monitoring of an event. The simulation of this project work has been done on NS2 platform for
WSNs. The simulation results of proposed I-DRINA algorithm gives better improvement in results than the
results of existing DRINA and LEACH algorithms for various performance parameters and different nodal
scenarios in WSN.
Keywords: Broadcasting delay, Critical event monitoring, Energy efficiency, Wireless sensor network.
I. INTRODUCTION
Wireless Sensor Network (WSN) consisting of the spatially distribution of independent sensor nodes
that co-operatively senses the physical conditions such as temperature, pressure, sound, level etc. and sends the
effective data towards the distant site through the wireless network. The WSN consists of a large number of
sensor nodes which are mostly battery powered or solar powered. Hence saving of energy for these nodes is a
significant issue in WSN. As the sensor nodes in network must have to work for a long time without recharging
or changing the batteries [1][2]. Hence the improvement in energy efficient algorithm is very much required in
WSN.
Also in WSN, many times a small message packets are required to broadcast as they are only to inform
the remote server regarding the environmental situations. Such environmental situations called as the critical
events. Hence while handling the critical event situations, the end to end delay required to transmit the alarming
message is less enough in the WSN to wake-up network. As the broadcasting delay occurs due to sleep
scheduling because of the sensing or relay node have to wait till the receiver nodes are active and ready to receive
that message. Therefore broadcasting delay is also important parameter while designing the protocols for the
WSN. This overall information is routed in the network in multipath manner towards the sink node. Hence data
gathering at specific nodes also gives effective way to reduce broadcasting delay in the network [3][4].
To improve performance of network by considering the energy efficiency and broadcasting delay, it is
necessary to improve the routing algorithms in WSN which is a challenging task. The routing performance will
be enhanced with improvement in the AODV algorithm. Therefore in this project work, we have proposed the
innovative approach Improved-Data Routing In Network Aggregation (I-DRINA). In this algorithm,
improvement in routing algorithm to that of existing algorithm Data Routing In Network Aggregation (DRINA).
This paper gives the comparative study of simulation results of existing algorithms as Low Energy Adaptive
Clustering Hierarchy (LEACH), (DRINA) and proposed algorithm (I-DRINA) [1][2][8].
II. COMPARATIVE STUDY OF PROTOCOLS
In this section, we will see the overview of existing algorithms for clustering, scheduling and data
aggregation which aims for energy efficiency and least broadcasting delay:
2.1 Low Energy Adaptive Clustering Hierarchy (LEACH)
In WSNs, LEACH plays an important role to form clusters for given nodes in the network. LEACH is an
AdHoc based routing protocol. In this algorithm, the clusters are formed based on the percentage of cluster heads
in the given WSNs. The LEACH protocol is divided in to two phases such as Cluster Formation and Data
Routing [3].

Enhancement of Routing Performance for Energy Efficiency and Critical Event Monitoring in WSN
2.1.1 Cluster Formation
In this phase, the clusters are formed with following equation:
(1)
The cluster and cluster head is formed based on the rounds. In this one of node in the network is picks
up a random value between 0 to 1. This value is compared with the threshold value T(n) for equation (1). If the
randomly selected value is less than that of the threshold value T(n), then that node is selected as a cluster head
in the respective round.
For the equation (1), ‘n’ denotes the present node. ‘P’ denotes the required percentage of cluster head
in the network. ‘r’ denotes the present round for selection of cluster head. ‘G’ denotes the nodes which are not
selected as a cluster head in (1/p) of previous rounds [1][2][3].
2.1.2 Data Routing
After the formation of clusters and selection of cluster heads in the above phase, the actual data transferred
through the network. In this, if one or multiple nodes in the network detect a critical event, then that node must
have to send that data to the cluster head as early as possible to the cluster head situated at remote place to
wake-up overall network. The data is transferred in two phases as uplink and downlink [5][6].
2.1.2.1 Uplink
In this Phase, after detecting a critical event in the network; that node sends an alarming message to the cluster
head and cluster head to remote server for further processing in the network in multi hop fashion.
2.1.2.2 Downlink
After getting the alarming message by cluster head to wake-up overall network, the cluster head broadcasts the
alarming message to the entire network quickly [7].
2.2 Data Routing In Network Aggregation (DRINA)
The main aim of DRINA algorithm is to improve routing performance in the network by implementing a routing
tree with shortest paths which connects overall sensor nodes to the server nodes or cluster head nodes in the
network. Also the data has been aggregated in this protocol to reduce the redundancy of data [8]-[12].
The DRINA protocol divides the nodes in to following four types.
 Collaborator: A node which identifies an event and collectively sends data to the coordinator.
 Coordinator: A node which also identifies an event. That node collects data sent by collaborator nodes and
sends to sink node.
 Sink: A node which accepts data from the collaborators and coordinator nodes.
 Relay: Nodes which are intermediate between the routing paths and forwards data to the sink node.
This protocol has distributed into three phases 1.Hop tree Formation 2. Cluster Formation and Leader Election
3.Establishment of Route and Hop Tree Update.
2.2.1 Hop Tree Formation
In this phase, the routing distance has been calculated in the form of hops by sending HCM (Hop
Configuration Message) message starting from sink node to overall network. The HCM message has distributed
in two fields: ID and HopToTree. The ID field gives the information about identifier which is started from sink
node and HopToTree contains the shortest routing distance of each node from the sink node shown in Fig. 1.
The HopToTree field started by 1 at sink node and overall nodes in the network set the HopToTree field to
infinity. After receiving the HCM message by node in the network; it checks the value of HopToTree in the
HCM message with the HopToTree value in the nodes which is stored previously. If the value is less, then that
node updates the value of NextHop variable with values in the ID and HopToTree Fields. If HCM message
again received by the same node, then that message is discarded by the same node as it has already acquired the
shortest distance from sink node [8]-[12].

Fig. 1 Hop Tree Configuration
2.2.2 Cluster Formation and Leader Election
In this phase, if one or multiple nodes detect an event, this algorithm forms cluster of that event detected nodes.
If this event is detected first round, then the node will be selected as a coordinator or leader node which is
closest to that of sink node shown in Fig. 2. Otherwise the coordinator node is close to the already established
routing path. If in case of tie that is two or more number of nodes are at the same distance from the sink node
then coordinator node will be that node which has minimum ID in HCM. The coordinator further collects the
information and sends towards the sink node with minimum hop distance [8]-[12].
Fig. 2 Cluster Formation and Leader Election
2.2.3 Establishment of Route and Hop Tree Update
In this phase, the route is established between the coordinator nodes and sink node with the help of
Route Establishment Message (REM). The coordinator nodes firstly send REM to the NextHop neighboring
nodes. As the NextHop nodes get the REM message, it further retransmits to the NexHop nodes to those nodes
with route table update process in the network. In this way, the Hop Updating process continues to the sink node
gets the REM message or a relay node which is the part of previously established tree path towards sink node.
This routing path is determined on the best suitable shortest route at each hop [8]-[12].
The Fig. 3 shows shortest possible path towards the sink node. If the event detected in the network
firstly, then the path is established with shortest distance with broadcasting HCM message as shown in Fig. 4.
The events detected afterwards at any nodes or clusters, they will firstly find the pre-established path as shown
in Fig. 5. This method gives the aggregation of the data in the network.

Fig. 3 Establishment of Route
Fig. 4 Hop Tree Updatation
Fig. 5 Establishment of Route and Hop Tree Update

III. PROPOSED METHODOLOGY
In the section, the I-DRINA protocol is improved with routing performance by considering the energy.
Energy is most crucial parameter in WSNs as it has to utilize in effective manner. Hence in proposed protocol
work, we have implemented the energy conscious routing algorithm. This algorithm maintains stability in the
network traffic which is intermediate between the source to destination nodes.
Consider the nodes in fig. 6(a) are intermediate nodes in the path of source to destination and the path
A-B-C-D is a shortest path from source to the destination node. But in this route path, the relay nodes B and C
remains as intermediate nodes. Therefore those nodes may blows down after some time due remaining energy at
those nodes. Therefore the proposed protocol works well at this situation by routing the path through neighbor
nodes by comparing the remaining energy of those nodes. In Fig. 6(b), the path is routed via node E and F
substituting to node B with route from source to A-E-F-C-D to destination. In Fig. 6(c), path is redirected via
nodes E-F-G substituting node C with route A-E-F-G-D to destination node. This path routing is done by
comparing the remaining energy of present relay nodes and the neighboring nodes which overhear the REM
message while route establishment phase.
Hence, the proposed protocol I-DRINA which is improvement to that of DRINA, gives the energy
efficient environment in WSNs in which the intermediate relay nodes are protected from getting blows down
due to energy remaining at those nodes. Also due to this sometime the routing may minimizes the broadcasting
delay in the network.
Fig. 6 Establishment of Energy Concious Route and Updatation of Hop Table
IV. PERFORMANCE EVALUATION
In this section, the results of proposed protocol I-DRINA has compared with the existing protocols as
LEACH and DRINA which are related to that of routing protocols in the network. The comparative study of
results with following performance parameters:
 Average Energy Consumption
 End to End Transmission Delay
 Average Throughput
 Normalized Routing Load
 Packet Delivery Ratio
4.1 Simulation Environment
In this project work, we have performed the experiments for the simulation results on Network
Simulator-2 which is simulation software for WSNs. The simulation has done for different nodal configuration

with area of 1000X1000 sq. meters. Assumption is that nodes have not mobility in the network. The simulation
model parameters required to perform experiment given in table 1.
Table: 1 Simulation Parameters
Simulation Parameters
Parameters Values
Simulation tool NS-2
Propagation Two Ray Ground
Channel used Wireless
Initial energy 100 Joules for each node
Network area 1000m X 1000m
Number of nodes 100,150,200,250,300
Number of clusters 2
Antenna type Omni-Directional
Routing MAC protocol AODV
Data packet length in queue 50
4.2 Simulation Result Analysis
In this experimental work for given protocols, the network has implemented on different scenario with 100, 150,
200, 250, 300. The analysis of result with different performance parameters are as follows:
4.2.1 Average Energy Consumption
In WSNs, sensor nodes mostly battery powered. So energy consumption must have to put as minimum as
possible. The main sources of consumption of energy in WSNs are sensing, routing or communicating and
computational work.
Fig. 7 Average Enegy Consumption
Results in Fig. 7 shows that the Average Energy Consumed by proposed I-DRINA protocol is minimized
compared to that of existing protocols.
4.2.2 End to End Transmission Delay
End to End Delay is the time required to transmit message packet from source node to destination node
successfully. It may contains all probable types of delays as queuing in the transmission path, buffering at
routers, acknowledgement delay, packet retransmission in case of packet failure, time for message coding.
Fig. 8 shows that the end to end delay in the proposed protocol I-DRINA is less than that of two known
protocols as LEACH and DRINA.
4.2.3 Average Throughput
Average Throughput is ratio of difference between number of data packets received at destination node
and number of data packets lost in between to the total time required from first data packet to last data packet.
The unit of throughput is bits/sec. Throughput in the network plays an important role as it is totally related to the

data packet loss and broadcasting delay in WSNs. In Fig. 9, the average throughput of I-DRINA is improved
compared to LEACH and DRINA effectively. The performance is incresed due to improvement in the routing
for the I-DRNA over the DRINA.
Fig. 8 Average End to end Delay
Fig. 9 Average Throughput
4.2.4 Normalized Routing Load
Routing Load is the ratio of number of routing packets to the number of data packets. The routing load
determines the network effectiveness. As the network must have minimum routing packets and maximun
number of data packets.
Fig. 10 Normalized Routing Load
Fig. 10 gives the copararison of result in which gives the idea about I-DRINA improved the routing load by
minimizing the routing packets in the network with effectively increase in number of data packets.

4.2.5 Packet Delivery Ratio
It is a ratio of number of received packets by destination nodes effectively to the number of packet
generated by the source node. This ratio must be high enough that is signifies the network performance affecting
due to packet loss in WSNs. The Packet Delivery Ratio is measured in the percentage form.
Fig. 11 Packet Delivery Ratio
In Fig. 11, proposed I-DRINA protocol gives the improvement in the Packet Delivery over the existing protocol.
V. CONCLUSION
In this project work, we have improved the routing performance of the proposed protocol I-DRINA.
The improvement has done by considering the energy efficiency with data aggregation in event monitoring in
WSNs. The dynamic routing in the network gives the better results to the network. The proposed protocol has
compared with energy consumption, broadcasting delay, throughput, routing load and packet delivery type of
performance parameters of the network. For these simulation results considering as a reference, the proposed
protocol I-DRINA protocol gives improvement in the overall performance parameters over existing LEACH and
DRINA protocols.
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Enhancement of Routing Performance for Energy Efficiency and Critical Event Monitoring in Wireless Sensor Network

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Enhancement of Routing Performance for Energy Efficiency and Critical Event Monitoring in Wireless Sensor Network