Qos Aware Routing Protocol for Manets
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Date
4/3/2013
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Addis Ababa University
Abstract
The current trend of connectivity anywhere, anytime, and any how brings a new
paradigm of accessing multimedia services (voice, video, and text) via MANETs
specifically in areas of military, emergency, automotive application e.t.c. However, the
available bandwidth for supporting these applications is rather limited, and proper
management of the bandwidth is necessary to accommodate the envisaged highbandwidth
applications and, thus, provide QoS. In other words it is a must to have QoS
support routing protocol that find a feasible path between source/destination pair (i.e. a
path that has sufficient available resources capable of satisfying the QoS requirements).
In this work, a survey on selected best effort routing protocols (OLSR, DSDV, and
AODV) is conducted using qualitative and quantitative multi metrics and shows
protocols that work in proactive mode are more suitable for QoS routing than reactive
ones. Since routes are maintained, proactive protocols have lower latency where as
reactive protocols may have higher latency because a route from source to destination will be found only when sender attempts to send to the receiver. However, proactive
protocols can (but not necessarily) result in higher overhead due to continuous route
updating. The result finally shows OLSR is a good candidate for QoS improvement.
Therefore, reengineering of best effort OLSR proactive protocol using new MPR
selection approach is found as the best alternative to add QoS features and the result is
a corresponding QoS Aware version of OLSR. Even though a number of variant
approaches are available, they are not optimal in selecting MPRs covering 2 hop
neighbors and a good quality links. Therefore, we have devised a new selection
mechanism that takes in to account the number of MPRs and bandwidth to have a
relatively better QoS support. With the help of scenario based simulation analysis, we
finally proved that QoS aware OLSR is better than the original OLSR in delivering QoS
services. Thus, the algorithm we proposed in architecting QoS Aware OLSR shows
improvement to the best effort OLSR in terms of QoS support.
Key words: MANETs, Qos Routing, best effort OLSR, QoS Aware OLSR, MPR
Description
Keywords
Manets; Qos Routing ;Best Effort OLSR; Qos Aware OLSR;MPR