03-10-2012, 05:20 PM
Improving AODV Routing Protocol with Priority and Power Efficiency in Mobile Ad hoc WiMAX Network
Improving AODV Routing Protocol.pdf (Size: 271.94 KB / Downloads: 67)
INTRODUCTION
For the last decade, many researches had been performed in mobile ad hoc networks (MANETs), especially in routing protocol of Ad hoc On-demand Distance Vector (AODV) [40] for the optimization or better performance. Many people expect that someday there will be a robust and reliable protocol due to the nature and characteristics of MANETs that always change, decentralized, self-configured, and had no infrastructure to manage.
In the early 2000s, researchers focused on the development of basic functions or services of the AODV protocol, such as shared channel, route discovery, and dynamic nodes. The purpose of their studies was to manage an ad hoc network topology that always change and answer the problem of disconnected route (route error) caused by the level of
mobility ad hoc node that can not be predicted.
DESCRIPTION OF AODV ROUTING PROTOCOL
Ad hoc On-demand Distance Vector (AODV) routing protocol is an on-demand protocol that is it discovers routes on an as needed basis using route discovery process. It uses traditional routing tables, one entry per destination to maintain routing information [2]. When a route to a new destination is needed, the node broadcasts a RREQ to find a route to the destination. A route can be determined when the RREQ reaches either the destination itself, or an intermediate node with a 'fresh enough' route to the destination. A 'fresh enough' route is a valid route entry for the destination whose associated sequence number is at least as great as that contained in the RREQ.
LITERATURE SURVEY
In [3,4] provided a very comprehensive and in depth survey about the QoS of routing in MANETs. Their papers offer a recent survey of major contributions to the MANETs routing protocols published in the period of 1997- 2011. It discussed about the QoS routing metrics, protocols, the factors that affect the performance of protocols, created the classification of protocols. The conclusions focus on several things as follows:
The design of protocol is classified based on MAC.
The optimization of route discovery.
Reliability protocol.
Management session.
Measurement of performance indicators.
They also identified several future research areas that can be done as follows:
Optimization algorithm.
Network topology and environment.
Multi-constraint routing.
CONCLUSION
A new model has been proposed which takes care of energy features based on priority of data for communication from source to destination. The new scheme will be incorporated on AODV and the results will be compared with existing AODV extensions with embedded energy and priority concept. Almost results are expected to be better than the standard AODV. The graphical notation will be used for representation. The metrics used will be Packet delivery ratio, the end to end delay and throughput and battery oriented parameters for nodes. Successful delivery of RREP message is very important in a MANET as a lot of route discovery effort is wasted if a reply message is lost, moreover a new route discovery process has to be reinitiated. Our simulation results show that AODV-PP protocol has better network lifetime with minor change in throughput in WiMAX Adhoc network.