5 research outputs found
Reducing energy consumption in mobile ad-hoc sensor networks
PhD ThesisRecent rapid development of wireless communication technologies and portable mobile devices such as tablets, smartphones and wireless sensors bring the best out of mobile computing, particularly Mobile Ad-hoc Sensor Networks (MASNETs). MASNETs
are types of Mobile Ad-hoc Networks (MANETs) that are designed to consider energy
in mind because they have severe resource constraints due to their lack of processing power, limited memory, and bandwidth as in Wireless Sensor Networks (WSNs).
Hence, they have the characteristics, requirements, and limitations of both MANETs
and WSNs. There are many potential applications of MASNETs such as a real-time
target tracking and an ocean temperature monitoring. In these applications, mobility
is the fundamental characteristic of the sensor nodes, and it poses many challenges
to the routing algorithm. One of the greatest challenge is to provide a routing algorithm that is capable of dynamically changing its topology in the mobile environment
with minimal consumption of energy. In MASNETs, the main reason of the topology
change is because of the movement of mobile sensor nodes and not the node failure due
to energy depletion. Since these sensor nodes are limited in power supply and have low
radio frequency coverage, they easily lose their connection with neighbours, and face diffi culties in updating their routing tables. The switching process from one coverage
area to another consumes more energy. This network must be able to adaptively alter
the routing paths to minimize the effects of variable wireless link quality, topological
changes, and transmission power levels on energy consumption of the network. Hence,
nodes prefer to use as little transmission power as necessary and transmit control packets as infrequently as possible in energy constrained MASNETs. Therefore, in this
thesis we propose a new dynamic energy-aware routing algorithm based on the trans-
mission power control (TPC). This method effectively decreases the average percentage
of packet loss and reduces the average total energy consumption which indirectly pro-
long the network lifetime of MASNETs. To validate the proposed protocol, we ran
the simulation on the Avrora simulator and varied speed, density, and route update
interval of mobile nodes. Finally, the performance of the proposed routing algorithm
was measured and compared against the basic Ad-hoc On-demand Distance Vector
(AODV) routing algorithm in MASNETs.The Ministry of Education of Malaysia:
The Universiti Malaysia Sarawak
Enhancement Of Aodv Routing Protocol In Masnets
The rapid development of wireless communication
technologies and portable mobile devices such as laptops, PDAs,
smart phones and wireless sensors brings the best out of mobile
computing particularly mobile ad-hoc and sensor networks.
Nowadays, most of researchers working on Wireless Sensor
Networks (WSNs) focus on Mobile Ad-hoc and Sensor Networks
(MASNETs) due to their wide range of potential applications
ranging from underwater monitoring to search and rescue mobile
robotics applications. In this research work, through extensive
simulation, we have evaluated the capability of Ad-hoc On
Demand Distance Vector (AODV) routing protocol on how far
it can react to different mobility duration of mobile nodes in
MASNETs. The performance of AODV is investigated in terms
of the average percentage of packet loss and energy consumption.
The initial performance study demonstrates that the performance
of AODV is signicantly decreased in mobile environment due
to the frequent topology change in MASNETs. Therefore, in
order to enhance the performance of AODV in MASNETs,
the new routing algorithm based on the estimated distance is
proposed to replace the hop count for the selection of next
node during the packet transmission. The estimated distance is
computed based on the Received Signal Strength Indicator (RSSI)
values that are collected during the communication between the
sensor nodes. The performance of the proposed solution is also
further evaluated and compared with the existing AODV routing
protocol in term of their energy consumption and percentage of
packet loss. Our study demonstrates that the proposed solution
outperform the existing AODV in MASNETs
FCSIT Research Bulletin 2016
The FCSIT Research Bulletin is an annual publication of the Faculty of Computer Science and Information Technology, UNIMAS. The purpose of FCSIT Research Bulletin is to disseminate information that represent the current state of the research activities, publications, research findings, training, conferences and seminar conducted by the academicians in the faculty