P. S. Vinayagam
Assistant Professor, Department of Computer Science,
Pondicherry University Community College, Puducherry, India
ABSTRACT
Optimized Link State Routing (OLSR) protocol is a proactive type of routing protocol that uses Multipoint
Relay (MPR) set as the virtual backbone structure. The existing literature has identified various issues with
respect to its backbone structure and has accordingly proposed improvements. In this paper, the focus is on
improving the OLSR protocol by employing a Connected Dominating Set (CDS) based virtual backbone
structure that is dynamically adaptable to rapid topology changes. A new Dynamically Adaptable Improved
Optimized Link State Routing (DA-IOLSR) protocol is proposed that uses the local topology information to
adapt the virtual backbone to topology changes. This assumes significance especially in networks that
experience very high mobility. Changes in the network topology caused by node additions, node deletions
and node mobility are taken care of. Simulations are carried out to assess the performance of DA-IOLSR
protocol and OLSR protocol. Packet delivery achieved by both the protocols is examined under varying
mobility by using various combinations of node speed and pause time values. It is found that DA-IOLSR
protocol provides better packet delivery as compared to OLSR protocol, under varying mobility conditions.
KEYWORDS
OLSR, Ad hoc network, Topology change, Virtual Backbone, Connected Dominating Set, MPR
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