In this paper, we have provided a brief technical analysis
of the existing routing studies along with contribution
and comments. We have also proposed, ‘traffic floworiented
routing (TFOR) protocol’, a routing protocol
for VANETs. It includes two major phases: first, it
selects the next junction optimally, based on directional
as well as the non-directional density, and
secondly, it uses two-hop neighbor information for
routing between the junctions. The comparative study
of TFOR with other existing approaches concludes that
our routing protocol performs significantly better than
the other routing approaches in VANETs. Our simulation
outcomes confirm that the TFOR outperforms
E-GyTAR, GPSR, and GSR. TFOR performed best in
terms of packet-delivery ratio, with an increase of 7.2%
compared to E-GyTAR, more than 16% as compared to
GPSR, and 9% as compared to GSR. In case of average
end-to-end delay, TFOR performed best, with delays of
15.3% lower than GPSR, 12% lower than GSR, and
7.5% lower than E-GyTAR. The proposed improve forwarding
mechanism based on two-hop neighbor considerably
lowers the average routing overhead as well
compared to existing solutions.
In the future, it would be interesting to examine the
behavior of TFOR in the presence of one-way roads. A
possible research direction could be to design a routing
technique that can work in both environments (city and
highway).