Multicasting routing protocol_for_wsn

National Conference on Current Trends in Computer Science and Engineering - CSECONF2012

Multicast Routing Protocol For WSN
Mahesh M [1]. Manasa V B [2]. Manjunath C R [3].Dr Nagaraj G S [4].
1, 2- M.Tech (CSE) 4th sem,
3- asst professor ,Dept. of Computer science & Engineering. S.B.M.J.C.E Bangalore (Rural).
4-professor R.V.C.E Bangalore
[1]
maheshmsh88@gmail.com, [2] vb.manasa@gmail.com, [3] manjucr123@gmail.com

Abstract: -A wireless sensor network (WSN) is a wireless network consisting of spatially
distributed autonomous devices using sensors to cooperatively monitor physical or
environmental conditions, such as temperature, sound, vibration, pressure, motion or
pollutants, at different locations. This letter proposes a Sink-initiated Geographic Multicast
(SIGM) protocol for mobile sinks in wireless sensor networks. To reduce location updates
from sinks to a source and to achieve fast multicast tree construction and data delivery, SIGM
allows sinks to construct their own data delivery paths from a source to them and a geographic
multicast tree to beautomatically constructed by merging the data delivery paths. Then, the
source forwards data to the sinks down the multicast tree. This paper also proposes a round
based virtual infrastructure with a radial shape for growing the merging probability of data
delivery paths and reducing the reconstruction frequency of the multicast tree due to mobility
of sinks.

Keywords:Data delivery paths, merging, sink-initiated geographic multicast, wireless sensor
networks, sink mobility.

1. INTRODUCTION

A single network may consist of several healthcare applications, home automation, and
interconnected subnets of different topologies. traffic control.
Networks are further classified as Local Area
Networks (LAN), e.g. inside one building, or
Wide Area Networks (WAN), e.g. between
buildings.A wireless sensor network (WSN)
is a wireless network consisting of spatially
distributed autonomous devices using sensors
tocooperatively monitor physical or
environmental conditions, such as temperature,
sound, vibration, pressure, motion or
pollutants, at different locations.The
development of wireless sensor networks was
originally motivated by military applications
such as battlefield surveillance. However,
wireless sensor networks are now used in
many civilian application areas, including
environment and habitat monitoring, Fig 1. Wireless Sensor Network.

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2.MAJOR ISSUES OF WSN Smart Dust. A Sensor Node forms a basic unit
of the sensor network.
The various areas where major research
activities going on in the field of WSN are
deployment, localization, synchronization,
data aggregation, dissemination, database
querying, architecture, middleware, security,
designing less power consuming devices,
abstractions and higher level algorithms for
sensor specific issues.
The major issues that affect the design and
performance of a wireless sensor network are Fig 2. Structure of Sensor Node
as follows:
The nodes used in sensor networks are small
1) Hardware and Operating System for WSN and have significant energy constraints. The
2) Medium Access Schemes hardware design issues ofsensor nodes are
3) Deployment quite different from other applications and
4) Localization they are
5) Synchronization
1) Radio Range of nodes should be high (1-5
6) Calibration
kilometers).Radio range is critical for ensuring
7) Network Layer
network connectivity and data collection in a
8) Transport Layer
network as the environment being monitored
9) Data Aggregation and Data Dissemination
may not have an installed infrastructure for
10) Database Centric and Querying
communication. In many networks the nodes
11) Architecture may not establishconnection for many days or
12) Middleware may go out of range after establishing
13) Quality of Service connection.
14) Security 2) Use of Memory Chips like flash memory is
Wireless sensor networks are composed of recommended for sensor networks as they are
hundreds of thousands of tiny devices called non-volatile, inexpensive and volatile.
nodes. A sensor node is often abbreviated as a 3) Energy/Power Consumption of the sensing
node. What is a Sensor Node? A Sensor is a device should be minimized and sensor nodes
device which senses the information and should be energy efficient since their limited
passes the same on to a mote. Sensors are used energy resource determines their lifetime. To
to measure the changes to physical conserve power the node should shut off the
environment like pressure, humidity, sound, radio power supply when not in use. Battery
vibration and changes to the health of person type is important since it can affect the design
like blood pressure, stress and heartbeat. A of sensor nodes. Battery Protection Circuit to
Mote consists of processor, memory, battery, avoid overcharge or discharge problem can be
A/D converter for connecting to a sensor and a added to the sensor nodes.
radio transmitter for forming an ad hoc 4) Sensor Networks consists of hundreds of
network. A Mote and Sensor together form a thousands of nodes. It is preferred only if the
Sensor Node.The structure of the sensor node node is cheap.
is as shown in fig. There can be different To solve the above problems, we propose a
Sensors for different purposes mounted on a Sink-initiated Geographic Multicast protocol
Mote. Motes are also sometimes referred to as (SIGM) whichcan achieve fast multicast tree

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construction and data delivery and reduce Fig 3.The path construction between the destination
location updates to a source. nodes and the boundarynodes in the proposed protocol.

3. RELATED WORK In addition, since the many position update
messages are forwarded toward the source
Recently, there have been proposed protocols node, sensor nodes near it consume quickly
for supporting efficiently multicasting through their energy. Also, because the source node in
only position information without the topology the SGM approach constructs a multicast tree
information of the whole sensor field in after obtaining the position information of all
wireless ad hoc sensor networks. Such destinations and then forwards its data to them
multicasting protocols exploit a Source through the multicast tree, the SGM approach
initiated Geographic Multicasting (SGM) has the problem of data delivery latency.
approach which consists of three phases. The Moreover, if the destinations have mobility,
first one is that a source node collects position they sendfrequently position updatemessages
information of all destinations in a multicast for updating their new position. Also, since
session. The second one is that the source node their new position information makes the
constructs a multicast tree spanning from it to source node reconfigure wholly the multicast
all destinations through the position tree, the energy consumption of sensor nodes
information by using the algorithm proposed grows and the data delivery latency rises.
in each protocol. The third one is that the Also, when each destination updates
source node forwards its data to all asynchronously its new position, the source
destinations through the multicast tree. node in the SGM approach is difficult to find
Namely, the SGM approach makes the source an opportune time for reconfiguring the
node lead all three phases of multicasting. multicast tree.
However, as shown in Fig, when the number
4. PROPOSED WORK
of destinations is high, the SGM approach
increases the energy consumption of sensor We propose a Sink-initiated Geographic
networks due to the delivery of many position Multicast protocol (SIGM) whichcan achieve
update messages. fast multicast tree construction and data
delivery and reduce location updates to a
source. SIGM allows mobile sinks to construct
their own data delivery paths from a source to
them and then a sink-initiated multicast tree to
be simultaneously constructed by merging of
the paths. The source immediately forwards
data to sinks through the multicast tree. For
enhancing scalability and mobility of SIGM,
we exploit a Round-based Virtual
Infrastructure with a Radial Shape (RVI-RS)
via which the data delivery paths from the
source to the sinks are constructed. By the
RVI-RS, SIGM can achieve more energy
saving by raising the merge probability of data
delivery paths and reducing the reconstruction
frequency of the multicast tree due to mobility
of sinks. Simulation results show that SIGM is

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superior to other protocols of SOGM approach wheredis(s, s1) is the distance from the sources
in terms of energy consumption and data s to the sink s1. Secondly, for finding an area
delivery delay. number ns1 for the circle level ns1, we use the
included angle 0s1 between the line
connecting the source and the sink and the
Base Line from the source. The included angle
0s1 can be calculated as followed:

(2)

To make all sector areas have an equal size,
the number of virtual lines that separate the
sector areas in the circle level ls1 could be 4
⋅(2 ⋅ls1 +1). Thus, the area number ns1 is
defined as follows:

Fig 4. Multicast tree construction by merging delivery (3)
paths of sink registration messages from mobile sinks to
a source via a RVI-RS in SIGM. B. Construction of Multicast Data Delivery
Paths
4.1 SINK-INITIATED GEOGRAPHIC
MULTICAST (SIGM) 1) Data Delivery Path Construction from Sink
to Proxy Boundary Node: As shown in Fig. 1,
A. Sector Area Calculation of Sink if a mobile sink s1 wants to receive multicast
data from a source, it sends a Sink Registration
We exploit a RVI-RS in SIGM. Figure 1
Message (SRM) including its location
shows sector areas (l, n) in the RVI-RS, which
information and circle level factor alpha to a
have a circle level l and an area number n. To
next sensor node n toward the source by
construct a data delivery path from a source,
geographic routing. The next node checks
SIGM requests each mobile sink to know its
whether it becomes a Boundary Node (BN) on
sector area in which it locates. A sector area
the RVI-RS or not. By the method presented in
(ls1, ns1) of a sink s1 is simply calculated with
the section II.A, it calculates the sink’s sector
its location (xs1, ys1), source’s location
area information (ls1 ,ns1 ) through the sink’s
(xs,ys), and circle level factor alpha. Basically,
location information and the circle level factor
we assume that every node can know its
alpha in the SRM, and its sector area (ln,Nn)
location by GPS or localization schemes and
with its location information and the circle
sinks can know source’s location by location
level factor. Then, it compares its sector area
service schemes. The circle level factor alpha
with the sink’s sector area. If the two sector
is a distancebetween any two neighbor circle
areasare the same, i.e. ls1 =!ln and ns1 =!Nn, it
lines, which is decided bynetwork operator,
only relays the SRM to a next sensor node
and decides the size of a sector area. Firstly,
toward the source by geographic routing. If
the circle level ls1 of the sink s1 is defined as
follows: not, i.e., it recognizes
itself as a BN and saves the SRM into its
(1) memory. We call the BN b1, which firstly

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receives the SRM, a Proxy Boundary Node the circle level i and is closest to the (Qb3 +1)-
(PBN) of the sink s1. The PBN sends a reply th line path, by the right-hand rule in GPSR.
message with its location information to the This process also continues until a BN (whose
sink by geographic routing. area number is one less than that of the PBN)
on the (Qb3+1)-th line path receives the SRM.
2) Data Delivery Path Construction from
Proxy Boundary Node to Source: A PBN If a PBN such as b2 locates on a line path in a
which receives a SRM sends it to the source circle level i, it sends the SRM to a sensor
by using routing with the RVI-RS. The PBN node which is on the line path and is closet to
locates on either a circle path or a line path one the source. The sensor node checks whether
RVI-RS according to its location. If a PBN, the circle level of its sector area is one less
such as b3 in Fig. 1, locates on a circle path of than that of the PBN’s sector area. If not, the
level i, it sends the SRM to the closest line sensor node becomes a BN and also sends the
path in the circle level i. To calculate the SRM to a sensor node which is on the line path
closest line path, it first calculates the included and is close to the source. This process
angle 0b3 between the line connecting from continues until a BN onacirclepathof (i − 1)
itself to the source and the Base Line by using level receives the SRM.
the equation (2). Next, it calculates the
included angle 0i between two neighbor line As shown in Fig. , if a BN m on the RVI-RS
paths of circle level i as follows: receives multiple SRMs from different BNs p1
and p2,itforwards further only one of them to a
BN toward the source. We call the BN m as a
(4)
Merging Boundary Node (MBN). Therefore,
Where 4(2 ⋅i+1) is the number of line paths of these two rules, the line path rule and the circle
circle level i. When 0b3 is divided by 0i, let path one, repeat until SRMs are finally
the quotient and the remainder be Qb3 and received by the source or MBNs.
Rb3, respectively. If 0 ≤ Rb3 <0i/2, the C. Multicast Data Delivery from Source to
closestline path is the Qb3-th line in level i. Mobile Sinks
The area number of the Qb3-th line is one
more than the area number of b3. Then,the In SIGM, a geographic multicast tree is
PBN sends the SRM with its sector area constructed by merging data delivery paths
information to asensor node, which is on the from sinks to a source. Hence, when the source
circle level and is closest tothe Qb3-th line wants to send multicast data to the sinks, it just
path, by the left-hand rule in GPSR. Thesensor forwards the multicast data through the
node checks whether its area number is one geographic multicast tree which consists of
more thanthe area number of the PBN. If not, BNs. A BN (or a MBN) on the multicast tree
the sensor node becomesa BN and also sends sends the multicast data to a next BN (or BSs)
the SRM to a sensor node closest to the Qb3-th down the multicast tree. For example in Fig. 1,
line path by the left-hand rule. This process a MBN m sends the multicast data to both next
continues until a BN (whose area number is BNs p1 and p2. This process continues until
one more than that of the PBN) on the Qb3-th the multicast data is received by all PBNs. The
line path receives the SRM. If 0i /2 ≤Rb3 <0i, PBNs send the multicast data to sinks by
the closest line path is the (Qb3 +1)-th line in geographic routing. However, since mobile
the circle level i. The area number of the (Qb3 sinks can freely move in sensorfield, SIGM
+1)-th line is one less than the area number of should support data delivery to the mobile
b3. The PBN sends the SRM with its sector sinks. In SIGM, a sink has two types of
area information to a sensor node, which is on mobility: intra-sector area mobility and inter
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sector area mobility. Thus, SIGM supports the Fig 7. Energy consumption for sink speed.
two mobility types. For the intra-sector area
mobility, a sink sends its new location to its
PBN whenever it moves farther than a specific
threshold distance within a sector area. Thus,
the intra-sector area mobility does not request
any reconstructions of the multicast tree
consisting of BNs. For the inter-sector area
mobility, a sink selects a new PBN through
geographic routing toward the source
whenever it moves into a new sector area.
However, the inter-sector area mobility of a Fig 8.Data delivery delay for sink speed.
sink does not bring about any change in paths
We compare the performance of SIGM with
of the othersinks on multicast tree because
that of GMR(without sink mobility support)
SIGM requests only the sinkto reconstruct its
and SEAD (with sinkmobility support) in the
multicast path to the source or a MBN.
SOGM approach. We implementedthem in
5. RESULTS Network Simulator Qualnet 4.0. Sensor nodes
follow the specification of MICA2 and their
transmission range is 25m. The size of the
sensor network is set to 1000m*1000m where
2000 nodes are randomly distributed. The
circle level factor alpha is 100m. Sinks know a
source’s location and send their SRMs to it by
geographic routing, and follow the random
way mobility as the mobility pattern. The
source sends multicast data to sinks every 5
Fig 5. Energy consumption for the number of sinks. seconds. We use two metrics for performance
evaluation. The Energy Consumption is
defined as the total communication energy the
sensor nodes consume. The Data Delivery
Delay is defined as the elapsed time that a sink
requests multicast data to a source and the sink
receives the multicast data from the
source.Figure 5 shows energy consumption for
the number of sinks. When the number of
sinks is few, SIGM consumes more energy
Fig 6. Data delivery delay for the number of sinks
than GMR and SEAD due to low merging
probability of SRMs. However, although the
number of sinks increases, the energy
consumption of SIGM does not rapidly
increase because it can reduce the delivery
frequency of SRMs to the source due to their
high merging probability. However, GMR and
SEAD consume energy in proportion to the
number of sinks because all sinks must send
their SRMs to the source. Figure 6 shows data

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delivery delay for the number of sinks. SEAD wireless sensor networks. For achieving fast
has high delay because the source constructs a multicast tree construction and data delivery,
multicast tree after receiving all SRMs and SIGM allows sinks to construct their own data
then sends data through the multicast tree. delivery paths to a source and a multicast tree
However, GMR has the lowest delay because to be automatically constructed by merging the
it selects next nodes to forward multicast data data delivery paths. The proposed protocol
to sinks per hop after receiving all SRMs. If also exploits a round-based virtual
the number of sinks increases, the delay of infrastructure with a radial shape for
GMR increases rapidly due to high increasing the merging probability of data
computational complexity for selecting such delivery paths and reducing reconstruction
next nodes. However, SIGM has low delay frequency of the multicast tree due to mobility.
because it constructs automatically a multicast Simulation results demonstrate that SIGM has
tree by merging data delivery paths and then better performance than GMR and SEAD in
forwards multicast data through the multicast SOGM approach.
tree. Figure 7 shows energy consumption for
the speed of sinks. If the speed increases, the 7. REFERENCES
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6. CONCLUSION

In this letter, we propose a Sink-initiated
Geographic Multicast protocol (SIGM) in
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