Enhancing the Efficiency of MANETs by Improving the On-demand Routing Protocols and QoSmetrics
Mamatha Balachandra, Prema K.V and Krishnamoorthy Makkithaya
Affiliation: Department of Computer Science and Engineering, M.I.T, Manipal, India.
Keywords: Mobile Ad Hoc Network (MANET), Quality of Service (QoS), Destination Sequence Distance Vector (DSDV),
Dynamic Source Routing (DSR), Ad Hoc On demand Distance Vector (AODV), LLT (Link Life Time), RLT (Route Life
Time), PLTR (Percentage Life Time Ratio), TCP (Transmission Control Protocol), CBR (Constant Bit Rate), PDR (Packet Delivery
A Mobile Ad Hoc Network represents a system of wireless mobile nodes that can freely and dynamically selforganize
into arbitrary and temporary network topologies, allowing people and devices to seamlessly communicate without
any pre-existing communication architecture. The growth of real time multimedia application in such environments,
has drawn a lot of attention to wireless networks that support quality of service (QoS). In this work, the QoS metrics,
delay and link life time (LLT) of the path are dynamically calculated. Based on these values the routing decisions
are made. Here the multipath routing protocol is taken as the base protocol. The proposed algorithm finds the
multiple QoS routes only, based on the QoS metrics and stores only those paths in the routing table. The route is selected
based on the integrated QoS metric and is used to transmit the data. The base protocol used is multipath AODV(Ad Hoc
On demand Distance Vector ) routing protocol. The proposed protocol may take extra time during route discovery process
to compute the additional QoS parameters, but this time is compensated by having only QoS paths for data transmission.
A few patents on the QoS Routing for MANETS have been reviewed.The simulator NS-2.34 is used to simulate and compare
the performance of the protocols in terms of the QoS metrics such as end-to-end delay, PDR in the MANET.
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