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Tuesday, 13 February 2018

A QoS-Oriented Distributed Routing Protocol for Hybrid Wireless Networks(2014)


A QoS-Oriented Distributed Routing 

Protocol for Hybrid Wireless Networks(2014)


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 anycast 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:
Reservation-based QoS routing protocols have been proposed for MANETs that create routes formed by nodes and links that reserve their resources to fulfill QoS requirements. Although these protocols can increase the QoS of the MANETs to a certain extent.
DISADVANTAGES OF EXISTING SYSTEM:
  • Cannot provide QoS-guaranteed services.
  • Suffer from invalid reservation and race condition problems .
  • Invalid reservation problem means that the reserved resources become useless and Race condition problem means a double allocation of the same resource to two different QoS paths.
PROPOSED SYSTEM:
  • 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.
ADVANTAGES OF PROPOSED SYSTEM:
  • QOD can provide high QoS performance in terms of overhead, transmission delay, mobility-resilience, and scalability.
MODULES:
  1. Network and Service Models.
  2. Neighbour Selection.
  3. Packet Scheduling.
  4. Packet Resizing.
  5. Redundancy Elimination.
MODULES DESCRIPTION:
Network and Service Models
We consider a hybrid wireless network with an arbitrary number of base stations spreading over the network. Mobile nodes are moving around in the network. Each Node uses IEEE 802.11 interface with the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) protocol. Since a hybrid network where nodes are equipped with multi-interfaces that transmit packets through multi-channels generate much less interference than a hybrid network where nodes are equipped with a single WiFi interface.
Neighbour Selection
In this Module, solves the problem of how to select intermediate nodes that can guarantee the QoS of the packet transmission and how a source node assigns traffic to the intermediate nodes to ensure their scheduling feasibility.
Packet Scheduling
In this Module, reduce the stream transmission time, a distributed packet scheduling algorithm is proposed for packet routing. This algorithm assigns earlier generated packets to for-warders with higher queuing delays and scheduling feasibility, while assigns more recently generated packets to forwarders with lower queuing delays and scheduling feasibility, so that the transmission delay of an entire packet stream can be reduced.
Packet Resizing
We use a mobility-based packet resizing algorithm for QOD. The basic idea is that the larger size packets are assigned to lower mobility intermediate nodes and smaller size packets are assigned to higher mobility intermediate nodes, which increases the QoS-guaranteed packet transmissions.
Redundancy Elimination
We can increase the scheduling feasibility of the intermedi-ate nodes and sequentially increase the QoS of the packet transmission. Due to the broadcasting feature of the wireless networks, in a hybrid network, the APs and mobile nodes can overhead and cache packets, we use an end-to-end traffic redundancy elimination (TRE) algorithm  to eliminate the redundancy data to improve the QoS of the packet transmission in QOD. TRE uses a chunking scheme to determine the boundary of the chunks in a data stream. The source node caches the data it has sent out and the receiver also caches its received data.
SYSTEM REQUIREMENTS:
HARDWARE REQUIREMENTS:
  • System                          :         Pentium IV 2.4 GHz.
  • Hard Disk                      :         40 GB.
  • Floppy Drive                 :         1.44 Mb.
  • Monitor                         :         15 VGA Colour.
  • Mouse                            :         Logitech.
  • Ram                               :         512 Mb.
SOFTWARE REQUIREMENTS:
  • Operating system           :         Windows XP/7.
  • Coding Language :         C#.net
  • Tool                     :         Visual Studio 2010
  • Database                  :           SQL SERVER 2008

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