© 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1870 CSMA/CA BASED AD-HOC NETWORK USING MAC PROTOCOL Er. Prabhnoor Bachhal 1 , Er. Shivani Kwatra 2 1 M.Tech(CSE Deptt) GGGI, Dinarpur, Ambala 1 Assistant Professor (CSE Deptt), GGGI, Dinarpur Ambala -----------------------------------------------------------------------------------***------------------------------------------------------------------------------- Abstract - With the extensive rapid progress of computers and the wireless communication, the mobile computing becomes the field of computer communications in high profile link. In wireless networks, the data is transmitted over the channel. Adhoc network is infrastructure less type of network in which nodes are moving. Due to movement of nodes the frequent changes are made in topology. CSMA/CA protocol is collision avoidance protocol and used for wireless networks. The problem arises when two transmitters transmit at the same time. To overcome the collision problem binary backoff algorithm is used. This algorithm reduces the chances of collision. With increasing the number of nodes the success rate, response time and hop count increases. So CSMA/CA is best used for hidden node problem. It increases the throughput and decrease the collision. In this paper we studied adhocnetwork,MAC protocol ,design isssues in MAC protocol and CSMA/CD mechanism. Keywords –CSMA/CD, MAC, PCF, DCF, BSS. INTRODUCTION 1.1 Adhoc network With the extensive rapid progress of computers and the wireless communication, the mobile computing becomes the field of computer communications in high profile link. To exchange information from one point to another communication is important. Wireless networks consist of nodes which communicate with each other over a wireless channel. Wireless communications networks are generally implemented and administered using radio communication. These wireless networks have various types like adhoc networks, sensor networks, cellular networks, satellite networks. The main focus is on adhoc networks. Adhoc network is a combination of wireless mobile nodes forming a wireless network. Adhoc network is infrastructure less type of network. Nodes in adhoc network act as routers that transmit data to desired destinations. Due to node mobility frequent changes are made in topology. Mobility of nodes in adhoc networks decreases the fair management of bandwidth and collision occurs when two nodes simultaneously transmit the data. In this type of network, nodes collision problem increases because all nodes are mobile and chances of collision are more. The network is said to be adhoc because it does not depend on a preexisting infrastructure, such as routers in wired networks or access point in infrastructure wireless networks[3].Network connectivity decides that which node forward data. Figure1.1 Adhoc network International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 05 | May -2017 www.irjet.net p-ISSN: 2395-0072