Energy efficient data communication approach in wireless sensor networks

International Journal of Advanced Smart Sensor Network Systems (IJASSN), Vol 4, No.3, July 2014
DOI:10.5121/ijassn.2014.4301 1
ENERGY EFFICIENT DATA COMMUNICATION
APPROACH IN WIRELESS SENSOR NETWORKS
1
Jaswant Singh Raghuwanshi,2
Neelesh Gupta,3
Neetu Sharma
1
Scholar (M.Tech.), ECE Department,TIEIT, Bhopal
2
HOD & A.P., ECE, Department,TIEIT, Bhopal
3
A.P., ECE, Department,TIEIT, Bhopal
ABSTRACT
Wireless sensor network has a vast variety of applications. The adoption of energy efficient cluster-based
configuration has many untapped desirable benefits for the WSNs. The limitation of energy in a sensor
node creates challenges for routing in WSNs. The research work presents the organized and detailed
description of energy conservation method for WSNs. In the proposed method reclustering and multihop
data transmission processes are utilized for data reporting to base station by sensor node. The accurate use
of energy in WSNs is the main challenge for exploiting the network to the full extent. The main aim of the
proposed method is that by evenly distributing the energy all over the sensor nodes and by reducing the
total energy dissipation, the lifetime of the network is enhanced, so that the node will remain alive for
longer times inside the cluster. The result shows that the proposed clustering approach has higher stable
region and network life time than Topology-Controlled Adaptive Clustering (TCAC) and Low-Energy
Adaptive Clustering Hierarchy (LEACH) for WSNs.
KEYWORDS:
Stability period, Clustering, Energy efficiency, Network lifetime
1. INTRODUCTION
Energy efficient operation has been considered as one of the important challenge of wireless
sensor networks (WSNs) for their practical applications. This energy conservation problem may
become a constriction for many sensor networks consisting of battery-driven sensor devices
where battery replacement is very costly or becomes almost impossible for many cases such as in
the battlefield, building maintenance etc. In order to continue the network operability for long
time a common design consideration must be focus on using some form of energy-efficient
approaches[1]. One facet to consider for energy efficiency is the communication subsystem as it
is the main energy consumer in WSNs [2]. It can consume 70% of network energy. The energy
consumption can be minimized efficiently through proper cluster head selection and message
minimization in data reporting.
This paper, proposed energy efficient data communication approach in the context of clustering,
where cluster heads are selected on the basis of remaining energy of sensor nodes and predefine
probability. It increases the stability period of the network because cluster head needs more
energy than normal nodes. Cluster head conserve energy to perform the operations like data
reception, data aggregation and data transmission to base station, where as normal sensor node
sense environmental conditions and send sense data to its respective cluster head. In the proposed

2
approach cluster head are selected in each round because rotation of cluster heads balance the
energy in the network.
Cluster head selection is totally random and dynamic in this approach therefore it may happens
more number of cluster heads are selected than the pre assumed value (predefine probability ×
total sensor nodes). It consumed more energy in data transmission to base station. This paper
proposed an approach in which cluster heads are regroup under one or more sensor nodes (second
level cluster heads). This paper uses multihop transmission to transmit data from second level
cluster head to cluster head and base station, vice versa.
The proposed approach is fully distributed, provides non-overlapping cluster heads in network. It
attains minimum energy consumption for intra cluster communication with a significant reduction
in the variation of the number of cluster heads selected per round compared with LEACH [3].
The simulation results show that the proposed approach has longer stable region and network life
time than TCAC and LEACH.
The rest of the paper is organized as follows. In Section 2, this paper present related work. In
Section 3, it Proposed approach for energy conservation in WSN is describes. In Section 4, it
provides simulation results and performance analysis of Proposed approach. In Section 5, it
concludes this paper.
2. LITERATURE REVIEW
In wireless sensor network energy conservative clustering approach is a key problem to increase
the network lifetime. It is also difficult to create energy efficient clustering approach due to the
completed energy configuration and network operation. In clustering, cluster heads require extra
energy for receiving data from cluster member nodes and sending aggregated data to base station,
which can be located far from the sensor network. Rotating the role of cluster heads among
sensor nodes helps to distribute the loads evenly among all nodes in the clusters. Many energy
efficient routing protocols are designed around clustered network structure[4][5]. The selection of
cluster heads can be done based on many criteria such as node residual energy, node id, nodes’
proximity to other nodes or randomness[3]. The cluster heads’ selection is determined
independently and probabilistically by each senor node. In the LEACH protocol, cluster heads are
selected based on a random round robin [3]. Each node calculates its probability to become a
cluster head and generate a random number between 0 and 1. If the number is less than the
calculated probability, the sensor node will become cluster head. The protocol forces every sensor
node to become a cluster head regardless of the energy level of the sensor node.
In PEGASIS, sensor nodes will be organized in the network as a chain, only one sensor node of
the chain aggregate all data and send it to the sink [6]. The problem in this protocol is that it
based on the requirement of the global knowledge of the network topology. The HEED protocol
is another distributed cluster based routing protocol in which the selection of cluster head
dependent upon the residual energy of the sensor node and also selects these cluster heads
stochastically [4]. In EECS which chooses the cluster heads with more residual energy through
local radio communication [7]. In cluster formation phase, EECS considers the tradeoff of energy
expenditure between sensor nodes to the cluster heads and the cluster heads to the base station.
But, it increases the need of global knowledge about the distance between the cluster heads and
the base station. In DEEC the cluster heads are selected on the basis of probabilistic threshold
based on the ratio between remaining energy of sensor nodes and the average network energy [8].
DEEC does not require any global knowledge of energy at every election round. It can also well
perform in multilevel heterogeneous sensor networks. In EECRP the Base Station selects the

3
Cluster Heads for sensing field[9]. The cluster head selection procedure is carried out in two
stages. In the first stage, all the sensor node become candidate nodes for becoming CH are listed,
based on the parameters like relative distance of the candidate node from the Base Station,
residual energy level, possible number of neighboring sensor nodes the candidate node can have,
and the number of times the candidate node has already become the Cluster Head. The EECRP
protocol is centralized, which consume lot of energy in communication between sensor nodes and
base station for parameter collection. A battery aware distributed clustering and routing protocol
(BADCR) incorporates the state of the battery’s remaining charge and health parameters in
computing the charge utility metric at each cluster formation round[10]. BADCR shows that by
optimizing the charge expenditure along with the nonlinear dynamics of the battery through the
various degrees of freedom, significant improvement in energy efficiency is achieved. The
Topology-controlled adaptive clustering scheme features capability of cluster heads to adjust their
power level to achieve optimal degree and maintain this value throughout the network
operation[11]. In the TCAC a topology control allows an optimal degree, which results in a better
distributed sensors and well-balanced clustering system enhancing network lifetime [11]. In
TCAC multihop communication does not used for data reporting to base station. It needs a
distributed approach to consider parameter as many as possible.
3. 1. PROPOSED APPROACH
This section, presents Proposed approach for wireless sensor networks. The following
assumptions with respect to the Proposed approach are made.
3.1 System model and assumptions
The following assumptions are made for the sensor networks:
I.All sensor nodes and base station remain stationary. After deployment all the sensor
nodes and sink remain stationary.
II. The sensor nodes are arbitrarily distributed over
sensing field.
III.The sensor nodes are densely deployed in the sensing field. This dense deployed
network achieves Quality of service.
IV.Sensor nodes recognize the relative position of the base station in the field.
All sensor nodes are homogeneous in terms of power, communication and processing
capabilities.
V.Sensor nodes are able to measure the present energy level. The sensor nodes have no
awareness of their location.
VI.A network operation model similar to [3][11] is adopted here, which consists of
rounds. Each round consists of a complete cycle of cluster head selection, cluster
formation and followed by data collection phase
.
3.2 The Proposed Approach
Proposed approaches accomplish in 3 phases setup phase I, setup phase II and steady condition
phase. In setup phase I cluster head is selected on the basis of probabilistic threshold (based on
remaining energy). At the setup phase II all the cluster heads are selected and formation of cluster
is accomplished. In steady condition phase reclustering process starts where all the selected
cluster heads reselect the second level cluster heads using threshold which is based on nodes
remaining energy and distance to base station. After the completion of second phase second level

4
cluster heads receive aggregated data from nearest cluster heads (red lines) and again aggregate
this data then send it to the base station (green lines) as shown in figure 1. This prolongs the
stability period of network. It is very crucial for many applications where stability of network
needed due to reliability.
Fig 1: The clustering in Proposed approach
3.2.1 Set up phase I
The setup phase I includes cluster head election and cluster formation process. In the cluster head
election process each sensor node chooses a random number between 0 and 1 separately. If this
number is lower than the calculated threshold ܶ ሺ݅ሻfor sensor node ݅, then the sensor node
i become a cluster head.
The threshold ܶ ሺ݅ሻ is given by
ܶሺ݅ሻ ൌ ሺ
Pୡ
ሺ1 െ Pୡ ൈ modሺr, roundሺ1
Pୡ
ൗ ሻሻሻ
ሻ ൈ
E୰ୣ୫
E୫ୟ୶
Where
Pୡ is the optimal probability for initial cluster head
ris the current round
E୰ୣ୫is the remaning energy of sensor node
E୫ୟ୶is the maximum or initial energy of sensor nodes
In the cluster formation process each cluster heads broadcast a cluster formation message within
the sensing field. On reception of cluster formation message each non cluster head sensor node
decide to join the cluster head, if it received the cluster formation messages more than one then
sensor node join nearest cluster head. After a constant time interval cluster head received cluster
join request messages from non cluster head sensor nodes. It creates a TDMA schedule for data
transmission within the cluster and sends to its cluster members
0 10 20 30 40 50 60 70 80 90 100
0
20
40
60
80
100
120
140
160
180

5
3.2.2 Steady condition phase and Setup phase II
The steady condition phase and setup phase II includes reselection of cluster heads and data
aggregation process. In the reselection process second level cluster heads are selected on the basis
of threshold and random number. The threshold Tሺsሻ for leaders shown below:
Tሺsሻ ൌ ሺ
Pୱୡ
ሺ1 െ Pୱୡ ൈ modሺr, roundሺ1
Pୱୡ
ൗ ሻሻሻ
ሻ ൈ
E୰ୣ୫
E୫ୟ୶
ൈ
D୫ୟ୶
D
Where
Pୱୡ is the optimal probability for second level cluster heads
D୫ୟ୶is the maximum distance of sensing field
Dis the distance between sensor node and base station
After the second level cluster heads selection, cluster head are regroups under the newly selected
second level cluster heads. Each second level cluster heads broadcast the regroup message within
the sensing field. Cluster head join the nearest second level cluster head by sending confirm
message. After a constant time each second level cluster head create a TDMA schedule for cluster
head and send to its respective members cluster head. Each cluster head send aggregated data at
the time slot allocated to it.
In the data aggregation phase each non cluster head sensor nodes send sense data to its respective
cluster head in the allocated time period. The cluster head aggregates data received by its cluster
members and send it to the respective second level cluster head in the allocated time period. If
there is any other cluster head node on the way to second level cluster head then it send data
using multihop. Cluster head send data to nearest cluster head which send data to second level
cluster head. Each second level cluster head receive data from its member cluster heads and
aggregated it then send this data to the base station using multihop communication. The
clustering process of Proposed approach is shown above in figure 2.

6
Fig 2: The flow chart of Proposed approach
4 SIMULATION RESULT
Implementation of proposed approach with clustered wireless sensor network in a field with
dimension. The total number of sensors node n=100. The sensor nodes are
randomly distributed over the sensing field. It means that vertical coordinate of each sensor nodes
are arbitrarily selected between 0 and maximum value of dimension. The sink is outside the
sensing field. The initial energy of a sensor node is set to 0.5J. The radio characteristic uses in our
simulation are summarized in table 1.
4.1 Stability period and Network lifetime
The stability period and network lifetime are used as key indicators to estimate performance of
the proposed approach. The stability period shows that the time interval from the start of the
operation to the first node dies. Stability period of the Proposed approach is about the 1070
rounds as shown in figure 3 (a). The network lifetime is the time interval from the start of
operation to the last node dies. Network lifetime of Proposed approach is greater than 2000
rounds as shown in figure 3 (a). The data transmissions from sensor nodes were simulated until
all the sensor nodes died.

7
Table 1: Simulation Parameters
0 200 400 600 800 1000 1200 1400 1600 1800 2000
10
20
30
40
50
60
70
80
90
100
110
NumberofNodes
Number of Rounds
(a)

8
0 200 400 600 800 1000 1200 1400 1600 1800 2000
0
10
20
30
40
50
60
70
80
90
100
110
NumberofRounds
Numberofalivenodes
LEACH
TCAC
PROPOSED
METHOD
(b)
Fig 3: The performance of Proposed approach in term of stability period and network lifetime
Figure 3 (b) shows the comparative results of LEACH, TCAC and Proposed approach for
network stability period and network lifetime [11]. The stable region of Proposed approach is
about 1070 rounds which is larger than LEACH [3](760 rounds) and TCAC (870 rounds) stable
region[11]. The network lifetime of LEACH is larger than TCAC protocol. In TCAC last node is
die around 1050 round but in case of LEACH protocol until 1500 rounds 5 nodes are still alive.
The network lifetime of Proposed approach is longer than LEACH protocol as shown in figure 3.
The observation has been made that the Proposed approach is best for applications needed
reliability because it has higher stability period as well as higher network lifetime.
4.2 Number of Packet transmission from cluster head to Sink
After the cluster election, each cluster head send out aggregated data to sink. Here the analysis is
made on cluster formation and packet transmission. The figure 4 shows that the number of
clusters formed in a round up to 47 clusters, but figure 5 shows that the number of packet
transmitted to base station is lower than the clusters formed in field.

9
Fig 4: The formation of cluster in per round in Proposed approach
Fig 5: The packets received by sink in per round in Proposed approach.
4.3 Probability for initial cluster head
The probability for initial cluster head used to calculate the threshold for cluster head selection. It
determines the number of cluster head in each round. We observe the performance of proposed
approach by varying the value of kinitial (kinitial =predefine probability × total sensor nodes). We
observed that by increasing the value of kinitial, numbers of cluster heads are increases therefore
stability of network is also increases. Figure 6 shows that stability period of TCAC protocol
increase from 880 rounds to 955 rounds[11].After some values TCAC stability period decreases
because intercluster communication increase. In Proposed approach stability period increases
from 1070 rounds to 1843 rounds.
0 500 1000 1500
0
5
10
15
20
25
30
35
40
45
50
Number of clusters
Number of rounds
Numberofclusterformedinfield
0 500 1000 1500
0
5
10
15
20
25
30
35
Number of packet to base station
Number of rounds
Numberofpacketrecivedbybasestation

10
Fig 6: Stability period for different Kinitial
5. CONCLUSION
In wireless sensor networks energy conservation is directly related to the network lifetime and
also energy play an important role in the cluster head selection. A new threshold has been
formulated for cluster head selection which is based on the remaining energy of the sensor node
and the distance from base station. Proposed approach selects cluster head nearer to base station
having maximum remaining energy than any other sensor nodes. This approach minimizing the
inter cluster communication without effecting the data reliability. The main objective of this
paper is to find ways to distribute the cluster head throughout the sensing field that will improve
energy efficiency and help in reliable transmission of sensed data to the base station in wireless
sensor networks. So it can say that proposed approach is best for the homogenous WSNs due to
the higher efficiency of this routing protocol.
6. FUTURE SCOPE
WSNs is quite a burning issue in wireless communication means that much research is going on
and many more issues are subjected to be investigated in this domain. Due to the time limitations,
proposed approach work focus was only on the energy efficient clustering Approach. Though,
there are many possible directions needed to be explored. The future directions for proposed
approach vary from network structure to, application types to application demands. Different
applications have different sensitivity factors. Different network designs have different
constraints with respect to varying challenges.
Different challenges need to be implemented on different protocols in real
scenarios to identify protocols efficiencies.
Clustering protocols need to be evaluated with specific performance metrics with
respect to application demand in order to identify protocols suitability for different
applications.
Clustering protocols protection should be investigated with respect to various
natures of attacks to which wireless communication is considered as an attractive target.
QoS for applications in WSNs needs to explored and appropriate algorithms need
to be devolved.
The effect of the undesired mobility is studied in another set of experiments.

11
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AUTHORS:
Jaswant Singh Raghuwanshi is a M.Tech Scholar from Truba institute of Engineering &
Information Technology, Bhopal .His Area of interest is Wireless Communication. He
complete his BE in Electronics & Communication (2007) from TCT – Thakral College of
Technology,Bhopal.India
Neelesh Gupta is Pursuing Ph.D in Electronics and Communication from Rajiv Gandhi
Technical University (RGTU), Bhopal (M.P.) India. He has a rich experience of teaching in
various Technical institutions of reputed in MP, India. Recently he has submitted their PhD
work. He is having more than 12 years of teaching Experience. Presently he is working as
HoD, ECE in Truba Institute of Engineering and Information Technology (T.I.E.I.T.), Bhopal
(M.P.) India. Total 15 students have completed their PG degree under his supervision. He has earned his
BE in Electronics and Telecommunication in 2002 from LNCT, Bhopal and MTech degree in Microwave
and Millimeter Wave in 2007 from MANIT, Bhopal. His area of research Interests are Wireless
Communication, Microwave and Digital Signal Processing. He has presented a number of research papers
in various National and International conferences in India and Abroad. He has Published number of Papers
in International Journals. He is Life time member of IETE, New Delhi (M.P.).

12
Neetu Sharma is working in Truba Institute of Engineering & Information Technology
,Bhopal as a Assistant Professor since July 2007 to till date. She has Awarded “Gold
Medal” for being the topper of MTECH (EC) in the 7th convocation of Rajiv Gandhi
Technical University , Madhya Pradesh. She has done her M. Tech in VLSI Design (May
2011) from SSSIST– Sri Satya Sai Institute of Science & Technology College, Sehore
affiliated to RGPV - Rajiv Gandhi Technical University, Bhopal (M.P.) with 79.07% aggregate. And BE in
Electronics & Communication (2007) from TCT – Thakral College of Technology, Bhopal (M.P.) affiliated
to RGPV - Rajiv Gandhi Technical University, Bhopal (M.P.) with 78% aggregate. She attends 8
workshops, 5 international conference & 6 national conferences. Her 4 journal and 2 book published.

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