NS2 PROJECT CENTERS AND GUIDANCE IN PONDICHERRY
A QoS-Oriented Distributed Routing Protocol for Hybrid
Wireless Networks
ABSTRACT:
As wireless
communication gains popularity, significant research has been devoted to
supporting real-time transmission with stringent Quality of Service (QoS)
requirements for wireless applications. At the same time, a wireless hybrid
network that integrates a mobile wireless ad hoc network (MANET) and a wireless
infrastructure network has been proven to be a better alternative for the next
generation wireless networks. By directly adopting resource reservation-based
QoS routing for MANETs, hybrids networks inherit invalid reservation and race
condition problems in MANETs. How to guarantee the QoS in hybrid networks
remains an open problem. In this paper, we propose a QoS-Oriented Distributed
routing protocol (QOD) to enhance the QoS support capability of hybrid
networks. Taking advantage of fewer transmission hops and any cast transmission
features of the hybrid networks, QOD transforms the packet routing problem to a
resource scheduling problem. QOD incorporates five algorithms: 1) a
QoS-guaranteed neighbor selection algorithm to meet the transmission delay
requirement, 2) a distributed packet scheduling algorithm to further reduce
transmission delay, 3) a mobility-based segment resizing algorithm that
adaptively adjusts segment size according to node mobility in order to reduce
transmission time, 4) a traffic redundant elimination algorithm to increase the
transmission throughput, and 5) a data redundancy elimination-based transmission
algorithm to eliminate the redundant data to further improve the transmission
QoS. Analytical and simulation results based on the random way-point model and
the real human mobility model show that QOD can provide high QoS performance in
terms of overhead, transmission delay, mobility-resilience, and scalability.
EXISTING SYSTEM:
Hybrid wireless
networks (i.e., multi-hop cellular networks) have been proven to be a better network
structure for the next generation wireless networks and can help to tackle the
stringent end-to-end QoS requirements of different applications. Hybrid
networks synergistically combine infrastructure networks and MANETs to leverage
each other. Specifically, infrastructure networks improve the scalability of
MANETs, while MANETs automatically establish self-organizing networks,
extending the coverage of the infrastructure networks. In a vehicle
opportunistic access network (an instance of hybrid networks), people in
vehicles need to upload or download videos from remote Internet servers through
access points (APs) (i.e., base stations) spreading out in a city. Since it is
unlikely that the base stations cover the entire city to maintain sufficiently strong
signal everywhere to support an application requiring high link rates, the
vehicles themselves can form a MANET to extend the coverage of the base
stations, providing continuous network connections.
DISADVANTAGES
OF EXISTING SYSTEM:
·
Difficult
to guarantee QoS in MANETs due to their unique features including user
mobility, channel variance errors, and limited bandwidth.
·
Although
these protocols can increase the QoS of the MANETs to a certain extent, they
suffer from invalid reservation and race condition problems.
PROPOSED SYSTEM:
In order to
enhance the QoS support capability of hybrid networks, in this paper, we
propose a QoS-Oriented Distributed routing protocol (QOD). Usually, a hybrid
network has widespread base stations. The data transmission in hybrid networks
has two features. First, an AP can be a source or a destination to any mobile
node. Second, the number of transmission hops between a mobile node and an AP
is small. The first feature allows a stream to have any cast transmission along
multiple transmission paths to its destination through base stations, and the
second feature enables a source node to connect to an AP through an
intermediate node.
ADVANTAGES
OF PROPOSED SYSTEM:
·
The
source node schedules the packet streams to neighbours based on their queuing
condition, channel condition, and mobility, aiming to reduce transmission time
and increase network capacity.
·
Taking
full advantage of the two features, QOD transforms the packet routing problem
into a dynamic resource scheduling problem.
SYSTEM REQUIREMENTS:
HARDWARE REQUIREMENTS:
Ø
System : Pentium IV 2.4 GHz.
Ø
Hard Disk :
40 GB.
Ø
Floppy Drive : 1.44
Mb.
Ø
Monitor : 15
VGA Colour.
Ø
Mouse :
Logitech.
Ø Ram : 512 Mb.
SOFTWARE
REQUIREMENTS:
Ø Operating system : Windows
XP/7/LINUX.
Ø Implementation : NS2
Ø NS2 Version : NS2.2.28
Ø Front
End : OTCL (Object Oriented
Tool Command Language)
Ø Tool : Cygwin (To simulate in Windows OS)
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