Virtual Back off Algorithm

The Virtual Back off Algorithm is developed by Prof. P. Venkata Krishna, Prof. Sudip Misra, Prof. M. S. Obdaiat and Prof. V. Saritha in 2008 and was published in IEEE Trans. on VTS. This algorithm aims to improve the performance of DCF protocol of 802.11 MAC. The basic principle is based on the use of Sequencing Technique where each node in the wireless network maintains a counter which limits the number attempts to less than or equal to K(Sequence Number).

Use of VBA, reduces number of collisions and increases throughput significantly in wireless networks. The complextiy of this method is less and implementing this method is simple as we need to introduce counter at each node. This method is energy efficient one.

more information can be obtained from

1.P. Venkata Krishna, Sudip Misra, Mohhamed S. Obaidat and V. Saritha, “Virtual Backoff Algorithm: An Enhancement to 802.11 Medium Access Control to Improve the Performance of Wireless Networks” in IEEE Trans. on Vehicular Technology (VTS), 2010 2. Sudip Misra, P. Venkata Krishna and Kiran Issac Abraham, “Learning Automata Solution for Medium Access with Channel Reservation in Wireless Networks” accepted in Wireless Personal Communications (WPS), Springer 3. P. Venkata Krishna & N.Ch.S.N. Iyengar “Design of Sequencing Medium Access Control to improve the performance of Wireless Networks” Journal of Computing and Information Technology (CIT Journal), Vol. 16, No. 2, pp. 81-89, June 2008. 4. P.Venkata Krishna & N.Ch.S.N.Iyengar, 'Sequencing Technique – An Enhancement to 802.11 Medium Access Control to improve the performance of Wireless Networks', Int. J. Communication Networks and Distributed Systems ,Vol.1,No.1, pp 52-70, 2008