Analysis of zone routing protocol in manet

IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 02 Issue: 09 | Sep-2013, Available @ http://www.ijret.org 520
ANALYSIS OF ZONE ROUTING PROTOCOL IN MANET
Sandeep Kaur1
, Supreet Kaur2
1
M.Tech (CSE) Student, Punjabi University Regional Centre for IT & Management Mohali, Punjab, India,
sandeepdeol1_5@yahoo.com
2
Assistant Professor (CSE), Punjabi University Regional Centre for IT & Management Mohali, Punjab, India,
skaur.gujral@gmail.com
Abstract
MANET is combination of wireless mobile nodes that communicate with each other without any kind of centralized control or any
device or established infrastructure. Therefore MANET routing is a critical task to perform in dynamic network. Without any fixed
infrastructure, wireless mobile nodes dynamically establish the network. Routing Protocols helps to communicate a mobile node
with the other nodes in the network by sending or receiving the packets. This research paper provides the overview of ZRP by
presenting its functionality. The performance of ZRP (Zone Routing Protocol) is analyzed on the basis of parameters Throughput,
Load, Data Dropped and Delay using simulator OPNET 14.0.
Index Terms: MANET, Routing Protocols, ZRP
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1. INTRODUCTION
Computer networks were originally developed to connect
number of devices through wires so that the devices can
share some information and data with each other. With the
increase in network sizes, the requirement of inter network
communication was observed which leads to the
development of internet and suit of protocols. It was
necessary to provide network access to the entities which are
not physically attached to any wired network. To enable
this, the wireless networks were developed. Wireless
network is a computer network that utilizes wireless
network connection. There are two categories of wireless
networks [5]:
 Infrastructured Network
 Infrastructure-less Network.
Infrastructured network contains fixed and wired gateways
whereas infrastructure-less network contains multi hop
wireless nodes and it has no fixed infrastructure. MANET
comes under the second category. MANET [1] [2] is a
temporary wireless network in which no fixed infrastructure
is used. So in MANET, topology changes frequently as
mobile nodes moves independently and changes their links
to the other nodes very quickly. Each mobile node acts a
router and forwards the traffic to the other nodes in the
network. If two mobile nodes are within each other’s
transmission range, they can communicate directly,
otherwise the nodes in between have to forward the packets
for them [4].
A mobile ad hoc network may consist of only two nodes or
hundred nodes or thousand nodes as well. The entire
collection of nodes is interconnected in many different
ways. As shown in Fig-1 there is more than one path from
one node to another node. To forward a data packet from
source to destination, every node in the hope must be willing
to participate in the process of delivering the data packet. A
single file is split it into a number of data packets and then
these data packets are transmitted through the different
paths. At the destination node, all these packets are
combined in sequence to generate the original file. , routers
Fig-1: Mobile Ad hoc Network
2. ROUTING IN MANET
Routing [4] is the process of transferring a packet from
source to its destination. In the routing process, a mobile
node will search for a path or route to communicate with the
other node in the network. Protocols are the set of rules
through which two or more devices communicate with each
other. In MANET, routing tables are used for routing
purpose. Routing tables contain the information of routes to
all the mobile nodes.
The routing protocols in MANET are broadly classified into
three categories [2] [4] [6]:
 Proactive or Table Driven Routing Protocols
 Reactive or On-Demand Routing Protocols
 Hybrid Routing Protocols

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2.1.Proactive or Table Driven Routing Protocols
In Proactive or Table-Driven [8] Routing Protocols, there
are routing tables which contains the information of routes
to all the nodes. Routes are predefined in the routing tables
and the packets are transferred to the routes. As route is
already specified in the table so packet forwarding is faster
and as the routes have to be defined first before transferring
the packets so overhead is more. All routes are maintained at
all the times so latency is low. Some highly used proactive
routing protocols are Destination Sequenced Distance
Vector (DSDV), Optimized Link State Routing (OLSR),
Wireless Routing Protocol (WRP).
2.2.Reactive or On-demand Routing Protocols
In Reactive or On-Demand [1] [15] Routing Protocols,
routes are not predefined. For packet transmission, a source
node calls for route discovery phase to determine the route.
The route discovery mechanism is based on flooding
algorithm which employs on technique that a node just
broadcasts the packet to all its neighbours and intermediate
nodes forwards the packets to their neighbours [4].
Overhead is smaller in reactive protocols but latency is
higher. Some reactive protocols are Dynamic Source
Routing (DSR), Ad hoc On-Demand Distance Vector
(AODV), Temporally Ordered Routing Algorithm (TORA).
2.3.Hybrid Routing Protocols
Hybrid Protocols [6] [7] are the combination of both i.e.
Table-Driven and On-Demand protocols. These protocols
take the advantage of best features of both the above
mentioned protocols. These protocols exploit the
hierarchical network architecture and allow the nodes with
close proximity to work together to form some sort of
backbone, thus increasing scalability and reducing route
discovery [3]. Nodes within a particular geographical area
are said to be within the routing zone of the given node. For
routing within this zone, Proactive i.e. table-driven approach
is used. For nodes that are located outside this zone,
Reactive i.e. an on demand approach is used. So in Hybrid
Routing Protocols, the route is established with proactive
routes and uses reactive flooding for new mobile nodes [2].
In Hybrid Routing protocols, some of the characteristics of
proactive and some of the characteristics of reactive
protocols are combined, by maintaining intra-zone
information proactively and inter-zone information
reactively, into one to get better solution for mobile ad hoc
networks [3].
3. OVERVIEW OF ZRP
The Zone Routing Protocol was the first Hybrid routing
protocol [9] [11]. It was proposed to reduce the control
overhead of Proactive routing protocol and to decrease the
latency of Reactive routing protocol. It is suitable for the
networks with large span and diverse mobility patterns. For
each node a routing zone is defined separately. Within the
routing zone, routes are available immediately but for
outside the zone, ZRP employs route discovery procedure.
For each node, a separate routing zone is defined. The
routing zones of neighboring nodes overlap with each
other’s zone. Each routing zone has a radius ρ expressed in
hops [9]. The zone includes the nodes whose distance from
the source node is at most ρ hops.
In Fig-2, routing zone of radius 2 hops for node A is shown.
Routing zone includes nodes all the nodes except node L,
because it lies outside the routing zone node A. The routing
zone is not defined as physical distance, it is defined in
hops. There are two types of nodes for a routing zone in
ZRP [9]:
 Peripheral Nodes
 Interior Nodes
The nodes whose minimum distance to central node is
exactly equal to the zone radius ρ are Peripheral Nodes
while the nodes whose minimum distance is less than the
zone radius ρ are Interior Nodes. In Fig. 2, Peripheral nodes
are E, F, G, K, M and Interior Nodes are B, C, D, H, I, J.
The node L is outside the routing zone of node A.
Fig-2: Routing Zone of Node A with Radius ρ=2 hop
Fig-3: Architecture of ZRP [10]
The source node sends a route request to the peripheral
nodes of its zone. Route request contains source address, the
destination address and a unique sequence number. Each
peripheral node checks its local zone for the destination. If
the destination is not a member of this local zone, the
peripheral node adds its own address to the route request
packet and forwards the packet to its own peripheral nodes.
If the destination is a member of its local zone, it sends a
route reply on the reverse path back to the source. The
source node uses the path saved in the route reply packet to
send data packets to the destination. By adjusting the
transmission power of nodes, numbers of nodes in the

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routing zone can be regulated. Lowering the power reduces
the number of nodes within direct reach and vice versa [10].
ZRP uses both the strategies i.e. Proactive and Reactive
routing. Within a routing zone, Proactive strategy is used.
Between the routing zones, Reactive strategy is used. ZRP
refers to locally proactive routing component as IntrA-zone
Routing Protocol (IARP). The globally reactive routing
component is named as IntEr-zone Routing Protocol [9]. Its
architecture is shown in Fig-3. IARP maintains routing
information of the nodes which are within the routing zone
of a node. Route discovery and route maintenance is offered
by IERP. When global discovery is needed, if the topology
of local zone is known, it can be used to reduce the traffic.
Instead of broadcasting a packet, ZRP uses the concept of
Bordercasting [10]. Bordercasting packet service delivery is
provided by the Bordercasting Resolution Protocol (BRP).
The BRP [11] uses a map of an extended routing zone,
provided by the local IARP, to construct Bordercast trees
along which query packets are directed. The BRP uses very
special query control mechanisms to steer route request
away from areas of the network that have already covered
by the query [11].
3.1. Route Discovery Process
The discover process of ZRP operates as follows [10] [12]:
 The source node first checks whether the
destination is within its zone. If so, destination
node is known and no further route discovery
process is required.
 If the destination is not within the routing zone of
source, the source node bordercast a route request
to its peripheral nodes.
 The peripheral nodes checks whether the
destination node is within their node or not. If so, a
route reply is sent back to the source node
indicating the route to the destination.
 If the destination node is not available in the
routing zones of peripheral nodes, route requests
are forwarded to their peripheral nodes.
The route discovery process is shown in the Fig-4.
3.2.Route Maintenance
Route maintenance is important in ad hoc networks, in
which links are broken and established as nodes moves
relatively to each other with limited radio coverage. Route
discovery or route repair must be performed if the route
broken or fails. Until the new route is available, packets are
dropped or delayed. [9]
In ZRP, the knowledge of the local topology can be used for
route maintenance. Link failures and sub-optimal route
segments within one zone can be bypassed. Incoming
packets can be directed around the broken link through an
active multi-hop path. The topology can be used to shorten
the routes, for example, when two nodes have moved within
each other’s radio coverage. For routed packets, a relaying
node can determine the closet route to the destination that is
also a neighbour. [9]
Fig-4: Flowchart of Route Discovery Process
4. SIMULATION SETUP
4.1 Simulation Scenario
Fig-5: Simulation Scenario with 20 nodes
To analyse the performance of ZRP OPNET 14.0 simulator
is used. Three different scenarios are created with varying
number of mobile nodes. The three scenarios contain 20, 40
and 60 mobile nodes respectively. The pause time and
traffic load are kept constant under all the scenarios.
Simulation parameters used for the implementation of ZRP
are listed in the Table 1.
4.2 Performance Metrics
Throughput [2]: Throughput is the average rate of successful
data packets received at the destination [2]. It is the measure
of how fast we can actually send the packets through the

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network. It is measured in bits per second (bits/sec or bps)
or data packets per second.
Load [6]: Load in the wireless LAN is the number of
packets sent to the network greater than the capacity of the
network. When the load is less than the capacity of the
network, the delay in packets is minimum. The delay
increases when the load reaches the network capacity.
Data Dropped: Data dropped is the count of number of bits
per second which are dropped during the travelling of
signals from source to destination. Data can be dropped due
to unavailability of access to medium.
Delay [7]: The packet end-to-end delay refers to the time
taken for a packet to be transmitted across the network from
source to destination. In other words, it is the time a data
packet is received by the destination minus the time a data
packet is generated by the source. It is measured in seconds.
End. Lost packets due to delay have a negative effect on
received quality.
Table-1: Simulation Parameters
5. RESULTS & DISCUSSION
Throughput: It is observed from the Fig-6 that with 20
nodes the throughput of ZRP is about 20000 bits per second
till 1 minute and 40 seconds after that its value increases to
1,20,000 bits per second. With 40 and 60 nodes it gives zero
throughput till 1 minute and 40 second. After that the
throughput of ZRP is gradually increasing and fluctuating.
Maximum value of throughput of 10,000,000 is observed at
3 minute with 60 nodes.
Fig-6: Throughput of ZRP
Load: From Fig-7 it is observed that load of ZRP is 0 bits
per second till 1 minute and 40 seconds for 20, 40 and 60
nodes. Minimum load is observed with 20 nodes. With 40
and 60 nodes, a high load is observed. Load with 40 and 60
nodes is almost the same. Maximum load of 66,00,000 bits
per second is observed with 60 nodes at 4 minute.
Fig-7: Load of ZRP
Data Dropped: It is observed from the Fig-8 no data is
dropped till 1 minute and 40 seconds. Afterwards data is
dropped till the end of the simulation. Low data is dropped
with 20 nodes. With 40 and 60 nodes the data dropped rate
is almost same. Its value is fluctuates between 3,000,000
Parameters Values
Simulator OPNET 14.0
Protocol
Examined
ZRP
Simulation Time 300 seconds
Simulation Area 1000m×1000m
Pause Time 10 sec
Buffer Size (bits) 256000
Data Rate (bps) 11 Mbps
Mobility Model Random way
point
Mobile Nodes 20, 40, 60

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bits per second to 58,000,000 bits per second for 40 and 60
nodes. Maximum data dropped rate about 57,000,000 bits
per second is observed at 4 minute.
Fig-8: Data Dropped
Delay: From Fig-9, it is observed that delay of ZRP is high
with 60 nodes. Average delay is observed with 40 nodes and
minimum delay is observed with 20 nodes. High delay of 19
sec is observed with 60 nodes.
Fig-9: Delay
CONCLUSIONS
From the results it is concluded that with the increase in
number of mobile nodes, ZRP gives high throughput. Load
increases with the increase in nodes. With 20 nodes, it gives
minimum load but as the nodes increases, a high load is
observed. With high load, the delay is also high. Data
dropped also increases with the increase in number of nodes.
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Analysis of zone routing protocol in manet

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