An Ordinary & Innovative Packet Routing Schemes in VANET

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 04 Issue: 07 | July -2017 www.irjet.net p-ISSN: 2395-0072
© 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 3177
An Ordinary & Innovative Packet Routing Schemes in VANET
Pawan Kumar Saini
Asst. Prof. Department of Computer Science & Engineering, MITRC,Alwar, Rajasthan,India
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Abstract – VANETs are start-of-the-art technology
integrating ad hoc network, wirelessLAN(WLAN)andcellular
technology to achieve intelligent Inter-Vehicle
Communications (IVC) and Roadside-to-Vehicle
Communications (RVC). However this network share some
common characteristics of Mobile Ad Hoc Network (MANET)
for organization of the nodes but duetouniquecharacteristics
as high mobility and unreliable channel conditions, it face
many challenging research issues, such as data dissemination,
data sharing, and security issues. Many researchers has given
their contribution in this area of research and lot of are going
on to reduce complications of VANETs network. This paper
presents some of the current research solution with brief
introduction of routing and routing protocols of VANETs.
Key Words: VANETs, MANETs, Routing, Routing Protocols,
Ad-hoc Network.
1. INTRODUCTION
From past decades, with the use of embryonic wireless
network VANETs have turned into an important research
area. It is a cooperative engagement of a collection of mobile
devices, herein referred to as nodes, without the required
intervention of any centralized access point or existing
infrastructure. Each node is equipped with a wireless
transmitter and a receiver. The topology of such networksis
likely highly dynamic because each node can freely move
without existence of pre-installed base stations. VANETsare
start-of-the-art technology integrating ad hoc network,
wireless LAN (WLAN) and cellular technology to achieve
intelligent Inter-Vehicle Communications (IVC) and
Roadside-to-Vehicle Communications (RVC). Schematic
representation of a Vehicular Adhoc Network presentinfig.1
Fig- 1 Vehicular Ad hoc Network
VANETs share some common characteristics of general
Mobile Ad Hoc Network for organization of the nodes but
due to high nodes mobility and unreliable channel
conditions, this class of network have face many challenging
research issues, such as data dissemination, data sharing,
and security issues.
However, much of researchers have given theircontribution
to reduce such issues and currently all major vehicles
manufacture companies and industries have taken these
issues into their accounts for enhancing the performance of
VANETs [1-6]. This paper investigates the state of art work
of VANETs related to routing protocols and their associated
issues. Further this paper is organized as follows: Section 2
describes the basic concepts ofroutingalong-withtaxonomy
of ordinary routing schemes in VANETs. Section3coversthe
basic issues of conventional routing schemes. Section 4
illustrates innovative routing scheme of VANETs. Section 5
exemplifies the current challenging issues of this network
and finally section 6 present the conclusionandfuturescope
in the field of VANETs which may be helpful for upcoming
researcher to understand and set their vision.
2. ORDINARY STEERING SCHEMES OF VANETs
At all times routing schemes plays a key role in performance
of any communication network. Typically routing is the act
of moving information from a source to a destination in an
internetwork which involves two activities: determining
optimal routing paths and transferring the packets through
an internetwork. The transferring of packets through an
internetwork is called as packet switching which is straight
forward and the process of path determination find out and
maintains routing tables; contain total route informationfor
the packet. The information of route varies from onerouting
algorithm to another. The routing tables are filled with
entries in the routing table are ip-addressprefixandthenext
hop. Destination/next hop associations of routing table tell
the router that a particular destination can be reached
optimally by sending the packetto a routerrepresentingthe-
address prefix specifies a set of destinations for which the
routing entry is valid. Routing is mainly classified into two
categories, static routing and dynamic routing [7].
Static routing refers to the routing strategy being stated
manually or statically, in the router. Static routingmaintains
a routing table. The routing table doesn‟t depend on the
state of the network status, i.e. whether the destination is
active or not. The major disadvantage with static routing is
that if a newer router is added or removed in the network
then it is the responsibility of the administrator to make the
necessary changes intheroutingtables.Staticroutingcannot

be applied efficiently for MANET due to dynamic nature of
MANET.
Dynamic routing refers to the routing strategy that isbeing
learnt by an interior or exterior routing protocol. This
routing mainly depends on the state of the network i.e. the
routing table is affected by the activeness of the destination.
In dynamic routing, each router announces its presence by
flooding the information packet in the network sothatevery
router within the network learns about the newly added or
removed router and its entries.
However, numerous investigators have categorize routing
protocol of VANETs in different ways, but according to the
routing strategy, network structure and on the basis of area
/ application where they are most suitable the routing
protocols of VANETs can be broadly classified into five
categories can be seen in figure 2 [8].
Fig-2 Routing Protocols in VANET
2.1 Topology Based Routing Protocol
The topology based routing protocols use link‟sinformation
and stores that information in table before sending data
from source to destination node. Several of approaches
proposed on the base of this routing approach. Topology
based routing approach can be further categorized in to
three groups: Proactive, Reactive & Hybrid Protocols.
Proactive routing protocols: These types of protocols are
mostly based on shortest path algorithms andalsoknown as
table driven routing protocol because they store the
information of all connected nodes in form of tables.
Whenever any change present in network the node shared
the information with their neighbors. The advantage of
proactive routing protocol is that there is no routediscovery
since the destination route is stored in the background, but
the disadvantage of this protocol is that it provides low
latency for real time application.Strategies implemented in
proactive algorithms are Link-state routing (OLSR),
Destination Sequence Distance-vector routing (DSDV),
Fisheye State Routing (FSR), Cluster head Gateway Switch
Routing(CGSR), Wireless Routing Protocol (WRP),Topology
Dissemination Based on Reverse Path Forwarding (TBRPF),
Global State Routing (GSR), Source Tree Adaptive Routing
(STAR) discussed in various papers[9-12].
Reactive Routing Protocol: The Reactive routing protocol
developed to overcome the overhead of proactive routing
protocol. The Reactive routing protocol also called on-
demand routing protocol because these protocol establish
the route only when it is necessary and only for those nodes
that are currently being used to send data packets from
source to destination.
Hybrid Routing Protocols: The hybrid routing protocol
combines characteristics of both reactive and proactive
routing protocols and proposed to reduce the control
overhead of proactive routing protocols with decreasingthe
initial route discovery delay in reactive routing protocols.In
Hybridvehiclecommunicationsystemvehiclescommunicate
with roadside infrastructure even when they are not in
direct wireless range by using other vehicles as mobile
routers.
2.2 Position Based Routing Protocols
The position based routing protocol or geographic routing
protocol use nodes location information rather than link
information to determine the optimal path for
communication. In this type of network each node having
whole information about source, destination and the
intermediates nodes. With the low overhead and the
dynamic connectivity of node the position based routing
protocols usually perform better than topology based
protocols. A position based routing protocol consists of
many major components such as “beaconing”, “location
service and servers” and “recovery and forwarding
strategies” [13].
Position based routing is broadly divided in two types:
Position based greedy V2V protocols, Delay Tolerant
Protocols. In the greedy forwarding strategy, an
intermediate node in a route forwards packet to the farthest
neighbor in the direction of the next anchor or the
destination. This approachrequirestheintermediatenodeto
have three important data points: the position of itself, the
position of its neighbors, and the position of the destination.
Typically, nodes acquired own position through GPS. Their
neighbor takes positions through message exchanges, and
the position of the destination node is usuallyfoundthrough
the use of a location service. Location servers may be
periodically placed external to the system, but this offers no
guarantee that such a server will be within range. To
alleviate this problem, quorum-based location services may
be built into nodes, or fully-distributedlocationservicesmay
be utilized [58].
2.3 Geocast Routing Protocols
Geo cast routing is basically a location based multicast
routing protocol and use to send a message to all vehicles in
a pre-defined geographical region.Thephilosophyisthatthe
sender node need not deliver thepackettonodesbeyondthe
Zone of Relevance (ZOR). The scheme followed a directed
flooding strategy within a defined ZOR so that itcanlimitthe
message overhead. The various Geo cast routing protocols
are IVG, DG-CASTOR and DRG. However these protocols

perform well but distributing the packets to all the nodes
within the geocast region with high probability with low
overhead is challenging problem because a clear trade-off
between the proportion of nodes in the geocast region that
receive the packet and the overhead incurred by the geocast
packet especially atlowdensitiesandirregulardistributions.
2.4 Cluster Based Routing Protocols
This type of routing protocol is based on position and
clusters. Each cluster has one cluster-head, which is
responsible for intra and inter-cluster management
functions. Intra-cluster nodescommunicate eachotherusing
direct links, whereas inter-cluster communication is
performed via cluster headers. In cluster based routing
protocols the formation of clusters and the selection of the
cluster-head is an important issue. In this protocol, the
geographic area is divided into some foursquare grids. Only
if there is a vehicle in a grid will a vehicle be elected to the
cluster header, and the data packet is routed by cluster
header across some grids one by one. In VANET due to high
mobility dynamic cluster formation is a towering process.
The various cluster based routing protocol are [14-16].
2.5 Broadcast Based Routing Protocols
This protocol most frequently used in VANET especially to
sharing, traffic, weather and emergency, road conditions
among vehicles and delivering advertisements and
announcements. Broadcasting is used when message needs
to be dispersed to the vehicle beyondthetransmissionrange
i.e. multi hops are used. Simplest of broadcast method is
carried by flooding in which each node rebroadcast the
message to other nodes. Broadcast sends a packet to all
nodes in the network, usually using flooding techniques,
ensuring the delivery of the packet but bandwidth is wasted
and nodes receive duplicates. This routing technique
performs better for a less number of nodes but has a higher
overhead cost.
In a vehicular ad hoc network it is important that broadcast
messages suchasemergency warningsshouldbe received by
all vehicles in the proximity of the endangered. The existing
routing protocols are effective only when the node
population is small and due to the high node mobility and
the movement constraints of mobile nodes the conventional
topology-based routing schemes are not suitable for
VANETs. There are several paper [17-19] present the issues
of existing ad hoc routing protocol to apply in the
environment of VANET.
3. HITCHES WITH ORDINARY ROUTING SCHEME
Since the advent of VANETs, design and implementation of
an efficient routing protocol withgoodperformanceandless
overhead is one of the fundamental challenges of this
network. However, various studies and researches made an
endeavour to reduce conventional routing schemes issues
but most of the previous work deals with the problem of
finding and maintaining correct routes to the destination
during mobility and changing topology. In addition,majorof
proposed approaches has backbone routing path that
increases the overhead and consume more bandwidth and
nodes power in communication, different terrains pose
separate challenges to routing in high dynamic environment
of MANETs. In MANETs, the Issues of accessible routing
protocols can be represent in point as
 The accessible routing protocols areeffectiveonlywhen
the node population is small.
 The proactive routing protocolswill beoverwhelmedby
the rapid topology changes and even fail to converge
during the routing information exchange stage.
 Reactive routing schemes will fail todiscovera complete
path due to frequent network partition.
 Most of existing routing protocols use flooding process
to setup a link between the pair of nodes thus consumes
high bandwidth and generates high end to end delays.
 Low scalability, where network can go from scarce to
dense in a very short time.
4. INNOVATIVE PACKET STEERING SOLUTIONS
FOR VANETs
With the aim to reduce the issues of traditional routing
algorithm two different groups of researchershavepresents
their unique ideas, name asEAODV(EnhancedAODV)and A-
SAODV (Adaptive SAODV) [20, 21]. However, both the
presented algorithms has improve quality of traditional
AODV routing scheme but fails to maintain its functionality
within high changes environment of VANETs, need some
more modification to enhance throughput with occurred
changes of network scenario.
To enhance the energy of network nodes a novel algorithm
MECB-AODV (Modified Energy ConstraintProtocol Based on
AODV) has been proposed in [22]. The approach optimized
the rebroadcasting procedure of existing AODV routing
protocol, before rebroadcasting of a RREQ packet each and
every node compare its remaining energy with a certain
threshold value. A node can rebroadcast the packet to all of
its neighbors only when it has the high energy value in
comparison of threshold. In approach each node calculates
its remaining energy to maintain the connectivity of the
network as long as possible. On the other hand intermediate
nodes reject the rebroadcasting of a packet when it has not
sufficient energy level. The simulation results of the
approach indicates that it enhance the energy level in
comparison of accessible AODV routing algorithm.
In [23], authors have introduces a hop greedy routing
scheme that yields a routing pathwiththe minimumnumber
of intermediate intersection nodes whiletakingconnectivity
into consideration. The hop greedy algorithm finds the best

possible path in terms of both hop count and connectivity.
Moreover, they introduce back-bone nodes that play a key
role in providing connectivity status around an intersection.
Apart from this, by tracking the movement of source as well
as destination, the back-bone nodes enable a packet to be
forwarded in the changed direction. Simulation results
signify the benefits of the proposed routingstrategyinterms
of high packet delivery ratio andshorter end-to-enddelay.In
[24], authors have propose a sequential decision vehicle
selection method based on the residual file (SSRF). The
method divides the process of selection into several stages
and selects cooperative vehicles from the candidates; the
decision sequence generated by SSRF determines the set of
cooperative vehicles. Simulation anddata analysisshowthat
their proposed method is effectiveintermsofdeliveredratio
and file delivered delay.
In [25], authors have presents a connectivity-aware
intersection based routing (CAIR) protocol to address
existing problems by selecting an optimal route with higher
probability of connectivity and lower experienced delay;
then, geographical forwarding based on position prediction
is used to transfer packets between any two intersections
along the route. Simulation results show that the proposed
protocol outperforms over the existing routing protocols in
terms of data delivery ratio and average transmission delay
in typical urban scenarios. In [26], authors have address the
routing issues of VANETs network and proposed a cluster
based routing approach, intend to escalate the routing
recitation in the challenging environment of VANETs. The
approach focused to find a most favorable route to the
desired destination, in ordertoincreasetheconnectivityand
satiability, which lead then to increase the network
reliability, in terms of increasingthroughput,packetdelivery
ratio with reducing overheads and time delays.
In [27], authors have provided an overview of the main
aspects of VANETs from a research perspective. This paper
starts with the basic architectureofnetworks,thendiscusses
three popular researchissuesandgeneral researchmethods,
and ends up with the analysis on challenges and future
trends of VANETs. A novel multi-hop clustering scheme for
VANETs have discussed in [28], which generates cluster
heads (CHs) via neighborhood follow relationship between
vehicles, is proposed. Typically, scheme is based on a
reasonable assumption that a vehicle cannot certainly
identify which vehicle in its multi-hop neighbors is the most
suitable to be its CH, but it can easily grasp which vehicle in
one-hop distance is the most stable and similar with it, and
thus, they most likely belong to the same cluster.
Consequently, a vehicle can choose its CH by following the
most stable vehicle. The relative mobility between two
vehicles combining the gains based on the followed number
and the historical following information enables a vehicle to
select which target to follow. Authors have performed
extensive simulation experiments to validate the
performance of their proposed clustering scheme. In [29]
authors have illustrates the basic architecture, routing
protocols classifications,bio-inspiredapproachesalongwith
applications and simulating tools for VANETs [29].
In [30], authors have proposed a unique solution to detect
and control the traffic congestion by using of both(V2V)and
(V2I), as a result the drivers become aware of the location of
congestion as well as way to avoid getting stuck in
congestion. The congestion is detected by analyzingthedata
obtained by vehicular communication and road side units to
avoid the traffic. Our proposition system is competent of
detecting and controlling traffic congestioninreal-time.V2V
and V2I communication network is used to receive andsend
the messages. The authors simulate the result by using
Congestion Detection and Control Algorithm (CDCA), and
show that this is one effective way to control congestion.The
proposed methodology ensures reliable and timely delivery
of messages to know about congestion and avoid it.
In [31] authors have introduces a flexible VANET testbed
architecture that is tailored for VANET applications’ needs.
The implementation of this architecture is tested using
standard VANET applications to evaluate its feasibility for
vehicular applications. Our results confirm the suitability of
the proposed testbed to meet VANET requirements.
Furthermore, the effect of adding a caching entity is
experimented and the results show its ability to mitigatethe
testbed’s overhead. In [32], authors have proposed a
vehicular system with three entities namely users, sink and
sensor and two set of communication between user to sink
and sink to sensor are needed. In short, we have proposed
architecture of data traffic/movement in vehicular sensor
network and authenticate the entities. In addition, we have
analysed our protocol with respect to security attacks and
found that it is strongly protected against security attacks.
Furthermore, the proposed protocol is relatively better in
terms of overhead such as computationandcommunication.
5. CHALLENGINGFACTORWITHVANETsROUTING
PROTOCOLS
However, a lot of works have done in area of VANETs to
design an appropriate and effective routing algorithm but
most of works are still simulation based which may not be
suitable for real world situations. On the other hand due to
the nature of dynamic network topology, routing in VANET
play a vital role for the performance of the networks. There
are various studies and researches in this field in attempt to
propose more efficient routing protocols. However, there is
not a routing protocol that can perform efficiently in every
situation. Due to high mobility of network nodes and
infrastructure less structure of VANET, the traditional
routing protocols that are designed especiallyformobilead-
hoc networks are not suited well with it. There are some
features of VANET that have to keep in mindwhiledesigning
routing protocols. The factor that challengethisnetwork can
be mainly point out as
Nodes frequently change their positions that make high
mobility, main cause of violation of establishconnection.The

routing tables must somehow reflect these changes in
topology and routing algorithms have to be adapted. For
example in a fixed network routing table approximately
updating takes place for every 30sec. This updating
frequency might be very low for VANET networks.
Due to the high node movement the path not remain
constant, break and establish frequently in VANET so the
packets are loss in high rate and increase delay.
Some other issues may be count as packet security,
Information Dissemination and Address configuration.
6. CONCLUSION
This paper investigates a wide-range literature over
conventional and innovative routing solution in area of
VANETs. The findings indicate that among several of issues
of VANETs efficient routing always remains as a challenging
task for in this field. However,numerousroutingapproaches
has proposed since the age of this network andcontinuously
investigators are presents newalgorithmtopick-upissuesof
routing in this highly dynamic and challenging environment
of wireless communication network but due to unique
limitation of each algorithm this field is still open with high
research challenges.
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BIOGRAPHIES
Mr. Pawan Kumar Saini obtained BE
from Rajasthan University & M.Tech
in CSE from JNIT, Jaipur. He has
published more than five research
papers in reputed conference and
journals. His research interests are
mainly on wireless data
communication networks

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