Performance Analysis of Clustering Protocols for Wireless Sensor Network

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | March -2017 www.irjet.net p-ISSN: 2395-0072
© 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 33
Performance Analysis of Clustering Protocols for Wireless Sensor
Network
Tejas Rana
Electronics & Communication
Dr. S. & S. S. Gandhy Govt. Eng. College
Surat, India
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Abstract - Wireless sensor networks (WSNs) are in large
demand in recent years as a wide growth of wireless devices.
WSNs consist of lots of tiny node & it is no longer useful
when battery dies, so to avoid this issue many protocols
were introduced. In this paper we analyses some clustering
protocol like LEACH, DSC, FTEEC & MEFC protocol.
1. INTRODUCTION
Wireless sensor network (WSN) consists of number of low
power, low cost sensor nodes which are used in different
applications such as environment monitoring,
surveillance, remote sensing. Designing energy-efficient
and reliable protocols is highly important in a resource-
constrained wireless sensor network (WSN). Clustering
protocols of WSNs are considered very energy efficient;
Clustering implies dividing sensor nodes in group
according to their nature and requirements. They can
execute different function. This paper focusing on
clustering protocol in WSNs. & give idea to build energy
efficient and fault tolerant WSN. In this paper we get brief
review of LEACH, DSC, FTEEC and MEFC protocol & show
the performance by simulation & comparisons with each
other.
2. LEACH Protocol
LEACH is the low energy adaptive hierarchy protocol
which is TDMA bases MAC protocol. The concept of LEACH
is to organize WSN in to clusters to improve the life of
WSN & by decreasing the energy used to generate &
maintain cluster heads. [2]
Fig. 1: Leach Structure [2]
The operation of leach protocol consists of two phases. Set
up phases & steady state phase. In the set up phase each
node decides whether or not to become cluster head for
the current head. For the current round based on
threshold,
( ) { ( )
Where p is the cluster head probability, G is the set of
nodes that have not been cluster heads in the last 1/p
rounds and r is the current round. In LEACH each node
becomes a cluster head only for a single time for r
rounds. In the beginning of each rounds every nodes
belong to G. The node is selected as a cluster head for the
current round if the random number is less than the T(i)
otherwise the node is expected to join the nearest cluster
head in its neighborhood. [1]
CH broadcasts a message to rest of nodes, depends of
the signal strength of the message each node select CH.
The CH creates a TDMA scheme & assigns each node a
time slot .In the steady state phase cluster heads collect
data from sensor nodes. Aggregate he data and send it to
BS. [1]
3. DSC protocol
DSC stands for dynamic & static clustering. IN dynamic
case DSC forms clusters for every round while in static, the
clusters are fixed for 10 rounds & CH position rotates.
Dynamic clustering is divided in to rounds & each round
consists two phases. Set up phase and Steady state phase.
Set up phase work same as LEACH. In set up phase clusters
are formed & CH selected, while in steady state phase, CHs
collect the data and send it to the base station.

Fig. 2: DSC Structure [3]
In static clustering each round consists the steady state
phase only. Nodes start sensing events & transmitting data
to the cluster head as per TDMA. If round number less
than 10 rounds, current CH select new CH with the enough
energy for next round & inform the base station. If round
number equal to 10 rounds then at the end of round all
nodes send energy status & set up phase starts to form
clusters.
4. FTEEC Protocol
FTEEC stands for fault tolerant & energy efficient
clustering protocol. Fault tolerance is the mechanism that
provides the continuous operation of the network by
detecting the failure of nodes. In FTEEC we assume that all
nodes have same initial energy. In set up phase, BS selects
a number of nodes as CHs based on the following criteria:
initially, BS selects a node A randomly as a CH. Then, BS
selects another node B randomly as a CH if node B is not
within the communication range of node A. Whenever a
node is selected as a CH, BS notifies that node. Then, CHs
broadcast their IDs to the network.
In the steady phase, a number of frames constitute a
round, where each node has a time slot allocated to it in a
frame using the TDMA scheme. In the steady phase, each
active node A that is selected in the setup phase sends
either the data that is sensed or a special packet to the CH
in its allocation timeslot using the TDMA scheme. If the CH
does not receive any data or a special packet from A, the
CH will assume that A has failed. Then the CH will exclude
the failure node from the allocated time slot.
At the end of a frame, if BS does not receive any data from
a CH, the BS sets a timer and sends a ‘hello’ message to
that CH. If the BS does not hear any ‘ACK’ message from
the CH before the timer expires, the BS assumes that the
CH has failed. Then the BS assigns the node with the most
residual energy of the cluster as a new CH.
5. MEFC Protocol
Mobile centric energy efficient & fault tolerant clustering
protocol is much similar to FTEEC. Main difference is
FTEEC do not support mobility of sensor nodes & does not
support mobile WSN applications. MEFC works in to four
phases.
In network set up phase BS selects number of nodes as
CHs which are one hop away from the BS, then selects
some nodes as Alternative CH (ACH) & apply this
procedure until all nodes of the network become CHs,
ACHs and cluster members. The member node of cluster
which is within communication range of maximum
number of neighboring CHs will be selected as a gateway
node.
In steady phase active nodes are assigned timeslot using
TDMA scheme. Active nodes sense the data and send it to
CHs. CHs aggregate all the data and send it to the BS.
In Fault tolerance phase, the BS sends “HELLO PACKET” to
a CH at its allocated timeslots if the BS does not receive
any data packet related to the event of interest. If the CH
does not send any “ACK-HELLO” packet or data packet at
the following timeslot the BS assumes that the CH has
failed and selects an ACH to work as a CH.
In mobility management phase, redundant sensors are
deployed such as in battle field surveillance where a group
of nodes move together, alternative nodes can be kept in
sleep mode and wake up at a certain interval to check the
status of active nodes. Network coverage is also important
for such applications. Where network coverage is not
important but receiving data from each sensor is
significant then all nodes are active. A number of nodes
are selected as CHs and ACHs and the rest of the nodes are
active members of a cluster. All members of a cluster work
using TDMA scheme to send data to its CH. If a member
node x of a cluster moves out of the cluster x sends a “JOIN
CLUSTER REQUEST” message to the CH, y that is closest to
the new location of x. If y has an available timeslot for x, y
accepts x as new cluster member by sending an “ACCEPT
JOIN” message and allocating the timeslot to x. Once the
CH, y receives data from all member nodes y aggregates
data and sends to the BS. If the BS does not receive data
from y and reveals that y has not failed but moved outside
of the cluster the BS selects the ACH with the most
residual energy as a new CH. [4]
6. Simulation Results
We perform simulation to measure the performance of the
all protocols in terms of network energy consumptions,
network lifetime and number of message transmissions.
We use randomly connected Unit Disk Graphs (UDGs) on
an area of 100 meters X 100 meters as a network
simulation model. The base station (BS) is placed at the
central location of the network at co-ordinate (55 X 50)
meter2. [4]

Table I: simulation parameters and their respective
values.
Parameters Value
Network Size 100 x 100
meter2
Number of Nodes Maximum
200
Number of Clusters 4 – 12
Base Station Position 55 x50 meter
Transmission Energy Consumption
( )
50 nJoule/bit
Energy Consumption in free space (
)
0.01
nJoule/bit/m
2
Energy consumptions in sleep state 0.002
nJoule/sec
Initial Node Energy 3 Joule
Fig. 3: Comparison of Network Energy Consumptions
We perform the simulation by varying the number of
rounds between 10 and 90 by fixing the number of nodes
at 100 and number of zones at 4 of an increment of 10,
where a round comprises a cluster formation phase and a
number of steady phases. Figure 3 illustrates that the
network energy consumptions of the proposed MEFC
protocol is much lower than the DSC and LEACH protocols
but a very slightly lower than FTEEC protocol. FTEEC and
MEFC have same performance in terms of network energy
consumptions. This is because the MEFC protocol reduces
the number of special packet transmissions as compared
to the existing FTEEC protocol, Figure 4 demonstrates that
the network lifetime of MEFC and FT-EEC protocols are
almost the same though their lifetime are much higher
than the existing DSC and LEACH protocols.
Fig. 4: Comparison of Network Lifetime
Fig. 5: comparison of number of message transmission
6. CONCLUSIONS
Theoretical analysis on energy consumptions shows
that the MEFC protocol perform better than existing
FTEEC, DSC and LEACH protocols in terms of
network energy consumptions. Simulation results
show that MEFC and FTEEC protocols have the
similar performance but the MEFC protocol
outperforms DSC and LEACH protocols in terms of
network energy consumptions. This is because the
reduction of the number of small-sized special
packets transmissions in MEFC protocol does not
reduces the overall network energy consumptions to
a great extent.

LEACH DSC MEFC
All nodes can
communicate with CH
& CH communicates
with BS
All nodes can
communicate with CH
& CH communicates
with BS.
Only Active nodes
communicate with
cluster heads
CH selection is
random process
CH selection based on
energy status &
current location of
nodes.
Nodes that are one-
hop away from the BS
are becoming CHs
CHs are not uniformly
distributed within the
cluster that means
CHs can be located at
the edges of the
cluster.
CH change in each
round
CHs are uniformly
distributed
No inter-cluster
communication in the
network because CHs
directly communicate
with BS.
No inter-cluster
communication
Gateway-node
available for inter-
cluster
communication
REFERENCES
[1] M. Ben Salah, A. Boulouz. "Energy Efficient Clustering
Based On LEACH." IEEE, 2016: 1-3.
[2] Reenkamal Kaur Gill, Priya Chawla, Monika Sachdeva"
Study of LEACH Routing Protocol for Wireless Sensor
Networks" 2014 International Conference on
Communication, Computing & Systems (ICCCS–2014).
[3] Awan, Fuad Bajaber and Irfan. "Dynamic/Static
Clustering Protocol for Wireless Sensor Network."
IEEE, 2008.
[4] lutful karim, jalal almhana & nidal nasser. "Mobility-
Centric Energy Efficient and Fault Tolerant clustering
protocol of wireless sensor network." IEEE (IEEE),
2013: 1479-1484.

Performance Analysis of Clustering Protocols for Wireless Sensor Network

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