Survey comparison estimation of various routing protocols in mobile ad hoc network

International Journal of Distributed and Parallel Systems (IJDPS) Vol.5, No.1/2/3, May 2014
DOI : 10.5121/ijdps.2014.5309 87
SURVEY: COMPARISON ESTIMATION OF VARIOUS
ROUTING PROTOCOLS IN MOBILE AD-HOC
NETWORK
Priyanshu and Ashish Kumar Maurya
Department of Computer Science & Engineering, Shri Ramswaroop Memorial
University, Uttar Pradesh- 225003, India
ABSTRACT
MANET is an autonomous system of mobile nodes attached by wireless links. It represents a complex and
dynamic distributed systems that consist of mobile wireless nodes that can freely self organize into an ad-
hoc network topology. The devices in the network may have limited transmission range therefore multiple
hops may be needed by one node to transfer data to another node in network. This leads to the need for an
effective routing protocol. In this paper we study various classifications of routing protocols and their types
for wireless mobile ad-hoc networks like DSDV, GSR, AODV, DSR, ZRP, FSR, CGSR, LAR, and Geocast
Protocols. In this paper we also compare different routing protocols on based on a given set of parameters
Scalability, Latency, Bandwidth, Control-overhead, Mobility impact.
KEYWORDS
MANET, Routing Protocol, Reactive Proactive, Hybrid, Hierarchical, Geographic Position, Assisted
Routing Protocol.
1. INTRODUCTION
Mobile Ad-hoc Network (MANET) is collection of wireless nodes that do not depend on already
existing infrastructure so there is no concept of base station or access point. In MANETs, due to
availability of mobility in nodes and deficiency of centralized entity, the network topology
changes repeatedly and erratically [1]. In MANETs each node works as router for packet
forwarding whereas in wired network router performs routing table. It is multi-hop wireless
network because different sets of nodes want to establish a network & it is not compulsory that
each node is within the transmission range as it might be in out of range, so another set of nodes
are used to connect the out of range nodes. Therefore whenever one node sends data to another
node, a set of nodes may be used in between, where data is send in different hop that’s why they
are also called multi-hop, wireless & distributed network [2].
Figure 1. Hop to hop data transfer in MANET

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Figure 1 depicts a multi-hop data transfer in a MANET. In the ad-hoc network nodes act as
routers as well as hosts therefore node may forward packets as well as run user applications [3,
4].The aim of MANET is to establish an accurate and efficient route between nodes such that any
messages are delivered on time [5]. Nowadays, with the immense growth in wireless network
applications like PDAs and cell phones, various researches are being done to improve the
network services and performance. So there are various challenging design issues in wireless
Ad Hoc networks [6].
Main challenges of these networks are:-
 Spectrum allocation
 Self configuration
 Medium access control
 Energy efficient
 Mobility management
 Security & Privacy
 Routing protocols
 QoS etc
Main applications of this network are home network, environmental monitoring and public
wireless access in urban area, Emergency rescue and Vehicular communications in military.
2. CLASSIFICATION OF ROUTING PROTOCOLS
Routing protocols define a set of rules which helps to transfer data or message packets from
source to destination in a network [6]. In MANET, there are different types of routing protocols
each of them is applied according to the network situations. Figure 2 shows the classification of
the routing protocols according to network structure in MANETs.
Figure 2. Classification of MANET routing protocols

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2.1. Table Driven Routing Protocol
Table driven routing protocols are also known as proactive routing protocols. They are
conventional routing protocols based on either link-state or distance vector principles [7]. In this
routing protocol every node maintains complete information about the network topology [8, 9].
Whenever the network topology changes the routing table is updated automatically. As they need
to keep node entries for each and every node in the routing table of every node therefore these
protocols are not appropriate for usage in large networks. Proactive routing protocols maintain
different number of routing tables varying from protocol to protocol [10]. Some popular proactive
routing protocols are: DSDV, GSR, OLSR, WRP etc.
2.1.1. Destination-Sequenced Distance-Vector Routing (DSDV)
Based on the Bellman-Ford routing mechanism DSDV is a proactive routing protocol [11]. It is a
loop free routing algorithm. Every mobile node in the network maintains a routing table which
maintains data of all the feasible destinations within the network and the number of hops to reach
each destination. Every entry is marked with a sequence number assigned by the destination node
[12]. The routing table updates is done by using two methods: full dump and incremental. The
neighbour receives the entire routing table, in full dump while the neighbour receives only the
entries that require changes in incremental update [11].
2.1.2. Global State Routing (GSR)
Global State Routing is a proactive routing protocol based on link state routing in which each
node floods the link-state information to every node in the network, each time its link changes.
GSR reduces the cost of link-state information by exchange of sequenced data rather than
flooding [13]. In this algorithm, each node maintains a neighbour list (contains the list of its
neighbours), topology table (contains the link state information), next Hop table (contains the
next hop to which the packets is forwarded) and a distance table (contains the shortest path to
each destination node).
2.2. On-Demand Routing Protocol
On-Demand Routing Protocol is also known as Reactive Routing Protocol. This protocol does not
maintain up to date view of all destination nodes in the network. Whenever route is needed then
only it is discovered, nodes start route discovery on demand basis and connection is establishes in
order to transmit and receive data packets [6, 14]. Source node sees its route cache for the
available route from source to destination, if the route is not available then it initiates route
discovery process. The route request packets are flooded by using flooding technique throughout
the network for route discovery. These protocols require a route discovery & route maintenance
process [15]. Many reactive routing protocols have been proposed example DSR, AODV, TORA
and LMR.
2.2.1 Ad Hoc On-Demand Distance Vector Routing (AODV)
Ad-Hoc On-Demand Distance Vector Routing (AODV) Protocol is based on On-Demand
Routing Protocol which is fundamentally an improvement on DSDV & it is designed for network
in such a way that they support thousands of mobile nodes. It only supports the use of symmetric
link. It minimizes the number of broadcasts by creating routes based on demand [16]. In this
protocol each node maintains sequence number & broadcast-id. To send any packet from source
node to destination node, a route request (RREQ) packet is broadcasted. The neighbouring nodes
receive the packet and broadcast it further to their neighbours and this process continues until the

90
packet reaches the destination. It typically uses distance-vector routing algorithms that keep
information about next hops to adjacent neighbours [17, 18].
2.2.2. Dynamic Source Routing (DSR)
Dynamic Source Routing is a Reactive Protocol based on the concept of source routing in which
source initiates route discovery on demand basis in multi-hop networks. The sender determines
the route from source to destination and it also includes the address of all intermediate nodes from
source to destination to the route record in the packet. Also called as a beaconless protocol where
HELLO messages are not exchanged between nodes to inform them about the presence of their
neighbours in the network [19].There are two key phases in DSR: route discovery and route
maintenance. All nodes maintain route caches that contain the source routes of which the mobile
is aware. The route caches entries are continually updated as new routes are learned. Route cache
is checked first when a source node wants to send a packet. If the route is available, the source
node incorporates the routing information inside the data packet before sending it [20].
2.3. Hybrid routing protocol
Hybrid routing protocol is the combination of proactive and reactive routing protocols. In this
protocol each node have predefine zone called cluster & all clusters form a hierarchical
infrastructure [21].The main purpose of designing this routing protocol is for larger and complex
network in order to take advantages of both Proactive and Reactive Routing Protocol. It
implements the route discovery mechanism and the table maintenance mechanism of reactive
protocol proactive protocol respectively in such a way so as to avoid latency and routing overhead
problems in the network [22]. It uses proactive protocol inside zone & reactive outside zone.
There are various hybrid routing protocols are ZRP, ZHLS, SHARP. Figure 3 and Figure 4 shows
the concepts used in hybrid protocols.
Figure 3. Combination feature of proactive and reactive routing protocol

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Figure 4. Hybrid routing protocol
2.3.1. Zone Routing Protocol (ZRP)
Zone Routing Protocol (ZRP) is the combination of both reactive and proactive routing protocols
to make routing more scalable and efficient [23]. It is basically proposed for wireless ad-hoc
networks with bi-directional links [24, 25]. This routing protocol is zone based i.e. different zones
may consist of number of nodes to create route discovery and maintenance more reliable [26].
Each node has a predefined zone, in which the nodes lying Inside Zones use proactive routing and
Outside Zones use on-demand routing protocol to provide more flexibility. Route creation is done
using a query-reply mechanism through Reactive Routing. ZRP uses a query control mechanism
to reduce route query traffic and also handles the network and perform route discovery more
efficiently [23,27]. Figure 5 shows a central node, inside zone and outside zone division of nodes.
Figure 5. Example: ZRP having zone radius = 2
2.4. Hierarchical Routing Protocol
Hierarchical Routing is multilevel clustering of mobile nodes. Routing protocols for mobile ad
hoc networks utilize hierarchical network architectures. The proper proactive routing and reactive
routing approach are dominated in different hierarchical levels. They are also appropriate for
wireless sensor networks (HSR). In case of a route failure the entire route does not need to be
recalculated. These networks address the scalability. This routing provides fast and most efficient
way of establishment for the communications of mobile nodes in MANET [28].
2.4.1. Fisheye State Routing (FSR)
FSR is a hierarchical routing protocol and a proactive protocol, based on link state routing
protocol that is suitable for wireless ad hoc network [29, 30]. FSR is more appropriate for large
networks where mobility is high and bandwidth is low. Basically FSR is an improvement of GSR.
It maintains updated information from the neighbour node through a link state table. FSR uses the

92
‘fisheye’ technique to reduce the size of information required to represent graphical data. It helps
to make a routing protocol more scalable by assembly data on the topology [31, 32]. Distance is
calculated by hops from the node and is used to classify zones in FSR.
2.4.2. Cluster Gateway Switch Routing Protocol (CGSR)
CGSR is a multi-hop mobile wireless network with various routing schemes [15] in which nodes
are organized into hierarchy of clusters. It is a multichannel operation capable protocol [33]
where each node has a cluster head and packet is sent through cluster heads. Cluster heads
communicate amongst themselves using DSDV and two clusters are connected through a gateway
node. A packet sent by a source node is first sent to its cluster head, and then the gateway receives
packet from the cluster head. The gateway then sent it over to another cluster head, and this
process goes on until the cluster head of the destination node is reached. A cluster head is able to
control a group of ad-hoc hosts and each node maintains two tables, first table is: cluster member
table that contain the cluster head for each destination node & second table is: DV-routing table
that contain the next hop to the destination.
Figure 6. CGSR
2.5. Geographic position assisted routing protocols
Geographic routing protocols have a lot of attention in the field of routing protocols for ad-hoc
network. They are more well-organized and scalable for ad-hoc network because these routing
protocols make minimum use of the topology information and there is no necessity needed to
keep routing tables up-to-date [34]. In this protocol each nodes know their geo coordinates and
propagate geo info by flooding. Geographic routing protocols such as LAR, DREAM, and GPSR
are the example of these routing protocols [35].
2.5.1. Location-Aided Routing (LAR)
Location information is used by LAR protocols to reduce the search space for a proper route.
Each node knows its location in each moment and utilizes location information for discovering a
new route to a smaller requested zone. Route discovery is initiated when source node doesn’t
know a route to destination or previous route from source to destination is broken. This protocol
is basically based on limited flooding to discover routes.

93
2.5.2. Geocast Protocols
Spread of a message to a few or all nodes within a geographical area is geocast. It uses specific
geographic information to specify the destination. Geocast group is only distinct by a geographic
region. Its information can be used to make routing more efficient. The main goal of geocast
protocols is to deliver data packets to a group of nodes that are inside a specified geographical
area [36]. It provides a better scalability among group of nodes [37]. Geocast is a variety of
amplification of multicast operations. The protocol to perform geocast operations can be divided
into two categories: data-transmission oriented protocols (such as LBM) and routing-creation
oriented protocols (Geo Tora). When a node in the geocast region receives the geocast packet, it
floods the packet such that the flooding is limited to the geocast region.
Figure 7. Geo cast
3. PERFORMANCE COMPARISONS
Since there are number of routing protocols and their different algorithms as discussed above
therefore there is a need to compare different routing protocols to judge the performance and their
usage over different networks. The comparison done here is based on a given set of parameters
such Scalability, Latency, Bandwidth, Control-overhead, Mobility impact.
Table 1. Comparison of Various Routing Protocol

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4. CONCLUSIONS
We have seen a great improvement in the field of wireless and Mobile ad hoc network .In this
paper we have described a number of algorithms for routing and broadly categorized routing
protocols- Table driven, on demand, Hierarchical, Hybrid and Geographic position assisted
routing protocols and compared the various routing protocol of mobile ad-hoc networks and
presented in the form of table for a given parameter. There is not any defined single protocol that
can be perfect for usage in all type of networks. For comparatively small network proactive and
reactive routing protocols are appropriate. But in large network can be either hierarchical or
geographic routing protocols are suitable.
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