Recently there has been substantial work done in the field of developing an energy efficient and reliable routing protocol for enhanced performance in Ad hoc networks. The field is maturing exponentially and is becoming one of the key research areas in the field of Communications with an objective of improving the quality of Ad hoc networks. The Ad-hoc on demand distance vector (AODV) routing algorithm is a routing protocol designed for Ad-hoc mobile devices. AODV is a combination of DSR and DSDV. It has basic on-demand mechanism of Route Discovery and Route Maintenance similar to DSR, and the use of hop by hop routing, sequence numbers and periodic beacons similar to DSDV. In this paper we have studied and analyzed the enhanced versions of AODV protocol to improve the Quality of Service (QoS).

1. H. Idoudi, M. Molnar, A. Belghith, B. Cousin, "Modeling uncertainties in proactive routing protocols for Ad hoc networks", 5th International Conference on Information and Communications Technology, 2007, pp. 327-332.
2. K. Khamforoosh, A. M. Rahmani and A. Sheikh Ahmadi, "A new multi-path AODV routing based on distance of nodes from the network center", Mosharaka International Conference on Communications, Propagation and Electronics, 2008, pp. 1-5.
3. S. Roy and J.J. Garcia-Luna-Aceves, "Node-Centric Hybrid Routing for Ad Hoc Networks", Proc. 10th IEEE/ACM International Symposium on Modeling, Analysis and Simulation of Computer and Telecommunications Systems, Texas, October 12, 2002.
4. L. Wang and S. Olariu, "A Two-Zone Hybrid Routing Protocol for Mobile Ad Hoc Networks", IEEE transactions on Parallel and distributed systems, December 2004 (Vol. 15, No. 12, 2004, pp.1105-1116.
5. C. Perkins, E. Belding-Royer, S. Das, Ad hoc On- Demand Distance Vector (AODV) Routing, RFC3561, July: 2003
6. Mehdi Effat Parvar, Mohammad Reza Effat Parvar, Amir Darehshoorzadeh, Mehdi Zarei, Nasser Yazdani “Load Balancing and Route Stability in Mobile Ad Hoc Networks base on AODV Protocol” 2010 International Conference on Electronic Devices, Systems and Applications (ICEDSA2010)
7. Suhua TANG’and Bing ZHANG’, A Robust AODV Protocol with Local Update, 10th dsia-pacific Conference on Camrmnications and 5th International Symposium an Multi-Dimensional Mobile Communications , 2004
8. Humaira Nishat, Vamsi Krishna K, Dr. D.Srinivasa Rao and Shakeel Ahmed, Performance Evaluation of On Demand Routing Protocols AODV and Modified AODV (R-AODV) in MANETS, International Journal of Distributed and Parallel Systems (IJDPS) Vol.2, No.1, January 2011
9. Pushpendra Kumar, Rohit Kumar, Satyendra Kumar and Rajendra Kumar Dwiwedi, Improved Modified Reverse AODV Protocol, International Journal of Computer Applications (0975 – 8887) Volume 12– No.4, November 2010
10. SP-AODV: A Semi-Proactive AODV Routing Protocol for Wireless Networks, Tooska Dargahi, Amir Masoud Rahmani, Ahmad Khademzadeh, International Conference on Advanced Computer Theory and Engineering 2008
11. Xinsheng Wang, Qing Liu and Nan Xu, The Energy- Saving Routing Protocol Based on AODV, Fourth International Conference on Natural Computation 2008
12. Said Khelifa and Zoulikha Mekkakia Maaza, “An Energy Multi- path AODV Routing Protocol in Ad Hoc Mobile Networks”, IEEE 2010.

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