Routing is a challenge in a dynamically changing network of mobile
devices. Proliferating ad-hoc network based applications have greatly
increased the need for a robust ad-hoc routing protocol.
Inter-vehicle communication based on ad-hoc networking has a huge scope
in terms of potential applications targeting improvement in driving
safety and convenience. However, because of associated challenges like
mobility and hostile
driving conditions, multi-hop communication needs to be supported by
a robust routing protocol. In this project, the application of
link-connectivity assessment to efficient ad-hoc routing will be
investigated and demonstrated.
State of the Art
The idea of choosing routes based on a metric that depends on SNR
of the constituent hops, has been discussed in [1,2,3]. It has been
demonstrated in [4] that IEEE 802.11b compliant devices can be used for
providing wireless connectivity between moving vehicles.
In this project I will refine and adapt link-connectivity assessment based
metric to route selection procedure for 802.11b infrastructure.
Project Resources
Laptops and iPAQs running Linux and equipped with IEEE 802.11b WLAN cards
will be employed as ad-hoc nodes. These nodes will either be travelling
in vehicles with 5 dBi gain antennae mounted on top, or will be
stationary acting as relays.
The open source OLSR (Optimal Link State Routing Protocol) [4] will be
used as a
vanilla version, on top of which the proposed link connectivity assessment
based changes will be implemented.
The Hewlett Packard wireless extensions utilities for signal strength
measurement between nodes, will be used [5].
Agenda
Demonstration of routing functionality in the test bed using
OLSR and resources described above.
Deciding metrics for performance apraisal of the OLSR protocol.
Proposal of link connectivity assessment based enhancements. Metrics
ascertaining the strength of link connectivity based on SNR measurements,
are discussed in [1,2,3]
Implementation of signal strength assessment based enhancements.
Deciding experimentation scenarios to demonstrate effectiveness of the
above.
Demonstration of routing functionality with above enhancements.
Investigating the performance of enhanced OLSR vis-a-vis the vanilla
version of OLSR.
References
Sulabh Agarwal, Ashish Ahuja, Jatinder Pal Singh and Rajeev Shorey,
"Route-lifetime Assessment Based Routing (RABR) Protocol for Mobile Ad-hoc
Networks", IEEE International Conference on Communications 2000, vol. 3,
pp.1697 - 1701, New Orleans
K. Paul, S. Bandyopadhyay, A. Mukherjee and D. Saha, "Communication
Aware Mobile Hosts in Ad-hoc Wireless Networks", IEEE International
Conference on Personal Wireless Communications (ICPWC), Feb 17-19, Jaipur
India, 1999.
Jatinder Pal Singh, Ashish Ahuja and Sulabh Agarwal, "Link
Connectivity Assessment Based Applications for Mobile Ad-hoc Networks",
42nd Annual Technical Convention of The Institution of Electronics and
Telecommunication Engineers, September 2000, New Delhi, India.
Jatinder Pal Singh, Nicholas Bambos, Bhaskar Srinivasan and Detlef
Clawin, "Wireless LAN Performance under Varied Stress Conditions in
Vehicular Traffic Scenarios", IEEE Vehicular Technology Conference, Fall
2002, Vancouver, Canada.
