{"title":"An Optimized Virtual Scheme for Reducing Collisions in MAC Layer ","authors":"M. Sivakumar, S. Saravanan","volume":96,"journal":"International Journal of Electronics and Communication Engineering","pagesStart":1934,"pagesEnd":1938,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10001753","abstract":"<p>The main function of Medium Access Control (MAC) is to share the channel efficiently between all nodes. In the real-time scenario, there will be certain amount of wastage in bandwidth due to back-off periods. More bandwidth will be wasted in idle state if the back-off period is very high and collision may occur if the back-off period is small. So, an optimization is needed for this problem. The main objective of the work is to reduce delay due to back-off period thereby reducing collision and increasing throughput. Here a method, called the virtual back-off algorithm (VBA) is used to optimize the back-off period and thereby it increases throughput and reduces collisions. The main idea is to optimize the number of transmission for every node. A counter is introduced at each node to implement this idea. Here counter value represents the sequence number. VBA is classified into two types VBA with counter sharing (VBA-CS) and VBA with no counter sharing (VBA-NCS). These two classifications of VBA are compared for various parameters. Simulation is done in NS-2 environment. The results obtained are found to be promising.&nbsp;<\/p>\r\n","references":"[1] Choi J, Yoo J, Choi S, and Kim C (2005), \u201cEBA: An enhancement of\r\nthe IEEE 802.11 DCF via distributed reservation,\u201d IEEE Trans. Mobile\r\nComput., Vol. 4, No. 4, pp. 378\u2013390.\r\n[2] XiaoY, Li H, Wu K, Leung K K and Ni Q , \u201cOn optimizing backoff\r\ncounter reservation and classifying stations for the IEEE 802.11\r\ndistributed wireless LANs,\u201d IEEE Trans. Parallel Distrib. Syst., vol. 17,\r\nno. 7, pp. 713\u2013722, Jul. 2006.\r\n[3] Baldwin R O, Davis N J, and Midkiff S E (1999), \u201cA real-time medium\r\naccess control protocol for ad hoc wireless local area networks,\u201d Mobile\r\nComput.Commun. Rev. (MC2R),Vol. 3, No. 2, pp. 20\u201327\r\n[4] Cal\u00ec F, Conti M, and Gregori E (2000), \u201cIEEE 802.11 protocol: Design\r\nand performance evaluation of an adaptive backoff mechanism,\u201d IEEE J.\r\nSel.Areas Commun., vol. 18, no. 9, pp. 1774\u20131786.\r\n[5] Krishna P V and Iyengar N (2008), \u201cSequencing technique: An\r\nenhancement to 802.11 medium access control to improve the\r\nperformance of wireless networks,\u201d Int. J. Commun. Netw. Distrib.\r\nSyst., Vol. 1, No. 1, pp. 52\u201370\r\n[6] Fitzek F, Kopsel A, Wolisz A, Krishnam M, and Reisslein M (2002),\r\n\u201cProviding application-level QoS in 3G\/4G wireless systems: A\r\ncomprehensive framework based on multirate CDMA,\u201d IEEE Wireless\r\nCommun., Vol. 9, No. 2, pp. 42\u201347.\r\n[7] Kleinrock L and Tobagi F A (1975), \u201cPacket switching in radio\r\nchannels:Part I\u2014Carrier sense multiple access modes and their\r\nthroughput\u2013delay characteristics,\u201d IEEE Trans. Commun., vol. COM-\r\n23, no. 12, pp. 1400\u20131416.\r\n[8] Krishna P V and Iyengar N (2008), \u201cDesign of sequencing medium\r\naccess control to improve the performance of wireless networks,\u201d J.\r\nComput. Inf. Technol., Vol. CIT 16, No. 2, pp. 81\u201389.\r\n[9] Mangold S, Choi S, Hiertz G R, Kle O, and Walk B (2003), \u201cAnalysis of\r\nIEEE 802.11e for QoS support in wireless LANs,\u201d IEEE Wireless\r\nCommun.,Vol.10,No.6,pp.40\u201350.\r\n[10] Zhu H, Li M, Chlamtac I, and Prabhakaran B (2004), \u201cA survey of\r\nquality of service in IEEE 802.11 networks,\u201d IEEE Wireless Commun.,\r\nVol. 11, No. 4, pp. 6\u201314.\r\n[11] Vaidya N, Gupta S, and Bahl P (2005), \u201cDistributed fair scheduling in\r\nwireless LAN,\u201d IEEE Trans. Mobile Comput., Vol. 4, No. 6, pp. 616\u2013\r\n628.\r\n[12] Pattara-Atikom W, KrishnaMurthy P, and Banarjee S (2003),\r\n\u201cDistributed mechanisms for quality of service (QoS) in wireless\r\nLANs,\u201d IEEE Wireless Commun., Vol. 10, No. 3, pp. 26\u201334. ","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 96, 2014"}