14-05-2012, 02:55 PM
Evaluation of Cognitive Wireless Networks in Rural Area for Disaster Information Network
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INTRODUCTION
Recent developments of wireless network technology
bring us to expect new various applications such as mobile
applications, the advanced traffic system, the disaster
prevention system, and so on. Especially, in case of Disaster
Information Network, wireless network is one of the best
communication means because it is easily and quickly
reconstructed even if some of the communication links and
nodes are down just after a disaster.
NETWORK MODEL
Network Configulation
The network configuration of our suggested cognitive
wireless network is shown in Fig. 1. Wireless nodes are
considered as wireless terminal, and they have routing, adhoc,
and multi-hop functions. Every node has different multiple
wireless links such as IEEE802.11a, IEEE802.11b,
IEEE802.16 (WiMax), and IMT2000. The lowest radio
frequency link is used as the control links for the purpose of
sending a network characteristic data or message of
switching links. Also, Antenna of each node is assumed to
be as non-directional.
Decision Stage
Decision making is held to maintain QoS at this decision
stage. When the network condition is changed, the proposed
system will seek the suitable link and route by the calculating
priority index from the values of network characteristics like
user policy, throughput, BER, and so on. We introduce
extend AHP method at the selection of suitable link and
extend AODV with Min-Max AHP method at the decision of
suitable route.
Link Selection
AHP is one of the multi-attribute decision making and
structured techniques for dealing with complex decisions. It
was developed by Thomas L. Saaty in the 1970s [6]. By
structuring a decision problem hierarchy, AHP provides us
quantifications of its elements and evaluations of alternative
solutions.