5,667 research outputs found
Modeling Routing Overhead Generated by Wireless Proactive Routing Protocols
In this paper, we present a detailed framework consisting of modeling of
routing overhead generated by three widely used proactive routing protocols;
Destination-Sequenced Distance Vector (DSDV), Fish-eye State Routing (FSR) and
Optimized Link State Routing (OLSR). The questions like, how these protocols
differ from each other on the basis of implementing different routing
strategies, how neighbor estimation errors affect broadcast of route requests,
how reduction of broadcast overhead achieves bandwidth, how to cope with the
problem of mobility and density, etc, are attempted to respond. In all of the
above mentioned situations, routing overhead and delay generated by the chosen
protocols can exactly be calculated from our modeled equations. Finally, we
analyze the performance of selected routing protocols using our proposed
framework in NS-2 by considering different performance parameters; Route
REQuest (RREQ) packet generation, End-to-End Delay (E2ED) and Normalized
Routing Load (NRL) with respect to varying rates of mobility and density of
nodes in the underlying wireless network
Modeling Enhancements in DSR, FSR, OLSR under Mobility and Scalability Constraints in VANETs
Frequent topological changes due to high mobility is one of the main issues
in Vehicular Ad-hoc NETworks (VANETs). In this paper, we model transmission
probabilities of 802.11p for VANETs and effect of these probabilities on
average transmission time. To evaluate the effect of these probabilities of
VANETs in routing protocols, we select Dynamic Source Routing (DSR), Fish-eye
State Routing (FSR) and Optimized Link State Routing (OLSR). Framework of these
protocols with respect to their packet cost is also presented in this work. A
novel contribution of this work is enhancement of chosen protocols to obtain
efficient behavior. Extensive simulation work is done to prove and compare the
efficiency in terms of high throughput of enhanced versions with default
versions of protocols in NS-2. For this comparison, we choose three performance
metrics; throughput, End-to-End Delay (E2ED) and Normalized Routing Load (NRL)
in different mobilities and scalabilities. Finally, we deduce that enhanced DSR
(DSR-mod) outperforms other protocols by achieving 16% more packet delivery for
all scalabilities and 28% more throughput in selected mobilities than original
version of DSR (DSR-orig)
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